From 4a495b1c43ed2e1495dad19987100ccd6c1575d7 Mon Sep 17 00:00:00 2001 From: Luotao Fu Date: Fri, 13 Nov 2009 10:41:15 +0100 Subject: mpc52xx_spi: fix clearing status register Before reading status register to check MODF failure, we have to clear it first since the MODF flag will be set after initializing the spi master, if the hardware comes up with a low SS. The processor datasheet reads: Mode Fault flag -- bit sets if SS input goes low while SPI is configured as a master. Flag is cleared automatically by an SPI status register read (with MODF set) followed by a SPI control register 1 write. Hence simply rereading the register is not sufficient to clear the flag. We redo the write also to make sure to clear the flag. V2 Changes: * change variable type from int to u8 Signed-off-by: Luotao Fu Acked-by: Wolfram Sang Signed-off-by: Grant Likely --- drivers/spi/mpc52xx_spi.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/spi') diff --git a/drivers/spi/mpc52xx_spi.c b/drivers/spi/mpc52xx_spi.c index ef8379b2c172..232225088bc1 100644 --- a/drivers/spi/mpc52xx_spi.c +++ b/drivers/spi/mpc52xx_spi.c @@ -391,6 +391,7 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, struct mpc52xx_spi *ms; void __iomem *regs; int rc; + u8 ctrl1; /* MMIO registers */ dev_dbg(&op->dev, "probing mpc5200 SPI device\n"); @@ -399,7 +400,8 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, return -ENODEV; /* initialize the device */ - out_8(regs+SPI_CTRL1, SPI_CTRL1_SPIE | SPI_CTRL1_SPE | SPI_CTRL1_MSTR); + ctrl1 = SPI_CTRL1_SPIE | SPI_CTRL1_SPE | SPI_CTRL1_MSTR; + out_8(regs + SPI_CTRL1, ctrl1); out_8(regs + SPI_CTRL2, 0x0); out_8(regs + SPI_DATADIR, 0xe); /* Set output pins */ out_8(regs + SPI_PORTDATA, 0x8); /* Deassert /SS signal */ @@ -409,6 +411,8 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, * on the SPI bus. This fault will also occur if the SPI signals * are not connected to any pins (port_config setting) */ in_8(regs + SPI_STATUS); + out_8(regs + SPI_CTRL1, ctrl1); + in_8(regs + SPI_DATA); if (in_8(regs + SPI_STATUS) & SPI_STATUS_MODF) { dev_err(&op->dev, "mode fault; is port_config correct?\n"); -- cgit v1.2.3 From d65aea99bd9e1d2e9560c5fff6c512d93c4a78d5 Mon Sep 17 00:00:00 2001 From: Luotao Fu Date: Fri, 13 Nov 2009 10:41:16 +0100 Subject: mpc52xx_spi: add missing mode_bits definition V2 changes: * remove CS_HIGH mode Signed-off-by: Luotao Fu Acked-by: Wolfram Sang Signed-off-by: Grant Likely --- drivers/spi/mpc52xx_spi.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/spi') diff --git a/drivers/spi/mpc52xx_spi.c b/drivers/spi/mpc52xx_spi.c index 232225088bc1..64862cfda19e 100644 --- a/drivers/spi/mpc52xx_spi.c +++ b/drivers/spi/mpc52xx_spi.c @@ -430,6 +430,8 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, master->num_chipselect = 1; master->setup = mpc52xx_spi_setup; master->transfer = mpc52xx_spi_transfer; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; + dev_set_drvdata(&op->dev, master); ms = spi_master_get_devdata(master); -- cgit v1.2.3 From b8d4e2ce60b63294e3408d1c5211b8a8dc4af095 Mon Sep 17 00:00:00 2001 From: Luotao Fu Date: Fri, 13 Nov 2009 10:41:17 +0100 Subject: mpc52xx_spi: add gpio chipselect This one enables the mpc52xx_spi driver for usage of user defined gpio lines as chipselect. This way we can control some more spi devices than only one V2 Changes: * preinitialize the gpio as output in probe function and call gpio_set_value in the chip select function instead of calling direction_output every time. * initialize the gpio line with output high, since we don't support CS_HIGH in the driver currently any way. change gpio value setting to default active low in chip select call. * free the gpio array while error or removing. Signed-off-by: Luotao Fu Acked-by: Wolfram Sang Signed-off-by: Grant Likely --- drivers/spi/mpc52xx_spi.c | 64 ++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 60 insertions(+), 4 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/mpc52xx_spi.c b/drivers/spi/mpc52xx_spi.c index 64862cfda19e..97beba2895e7 100644 --- a/drivers/spi/mpc52xx_spi.c +++ b/drivers/spi/mpc52xx_spi.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include @@ -79,7 +80,6 @@ struct mpc52xx_spi { spinlock_t lock; struct work_struct work; - /* Details of current transfer (length, and buffer pointers) */ struct spi_message *message; /* current message */ struct spi_transfer *transfer; /* current transfer */ @@ -89,6 +89,8 @@ struct mpc52xx_spi { u8 *rx_buf; const u8 *tx_buf; int cs_change; + int gpio_cs_count; + unsigned int *gpio_cs; }; /* @@ -96,7 +98,13 @@ struct mpc52xx_spi { */ static void mpc52xx_spi_chipsel(struct mpc52xx_spi *ms, int value) { - out_8(ms->regs + SPI_PORTDATA, value ? 0 : 0x08); + int cs; + + if (ms->gpio_cs_count > 0) { + cs = ms->message->spi->chip_select; + gpio_set_value(ms->gpio_cs[cs], value ? 0 : 1); + } else + out_8(ms->regs + SPI_PORTDATA, value ? 0 : 0x08); } /* @@ -390,8 +398,9 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, struct spi_master *master; struct mpc52xx_spi *ms; void __iomem *regs; - int rc; u8 ctrl1; + int rc, i = 0; + int gpio_cs; /* MMIO registers */ dev_dbg(&op->dev, "probing mpc5200 SPI device\n"); @@ -426,8 +435,8 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, rc = -ENOMEM; goto err_alloc; } + master->bus_num = -1; - master->num_chipselect = 1; master->setup = mpc52xx_spi_setup; master->transfer = mpc52xx_spi_transfer; master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; @@ -441,6 +450,40 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, ms->irq1 = irq_of_parse_and_map(op->node, 1); ms->state = mpc52xx_spi_fsmstate_idle; ms->ipb_freq = mpc5xxx_get_bus_frequency(op->node); + ms->gpio_cs_count = of_gpio_count(op->node); + if (ms->gpio_cs_count > 0) { + master->num_chipselect = ms->gpio_cs_count; + ms->gpio_cs = kmalloc(ms->gpio_cs_count * sizeof(unsigned int), + GFP_KERNEL); + if (!ms->gpio_cs) { + rc = -ENOMEM; + goto err_alloc; + } + + for (i = 0; i < ms->gpio_cs_count; i++) { + gpio_cs = of_get_gpio(op->node, i); + if (gpio_cs < 0) { + dev_err(&op->dev, + "could not parse the gpio field " + "in oftree\n"); + rc = -ENODEV; + goto err_gpio; + } + + rc = gpio_request(gpio_cs, dev_name(&op->dev)); + if (rc) { + dev_err(&op->dev, + "can't request spi cs gpio #%d " + "on gpio line %d\n", i, gpio_cs); + goto err_gpio; + } + + gpio_direction_output(gpio_cs, 1); + ms->gpio_cs[i] = gpio_cs; + } + } else + master->num_chipselect = 1; + spin_lock_init(&ms->lock); INIT_LIST_HEAD(&ms->queue); INIT_WORK(&ms->work, mpc52xx_spi_wq); @@ -477,6 +520,12 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, err_register: dev_err(&ms->master->dev, "initialization failed\n"); spi_master_put(master); + err_gpio: + while (i-- > 0) + gpio_free(ms->gpio_cs[i]); + + if (ms->gpio_cs != NULL) + kfree(ms->gpio_cs); err_alloc: err_init: iounmap(regs); @@ -487,10 +536,17 @@ static int __devexit mpc52xx_spi_remove(struct of_device *op) { struct spi_master *master = dev_get_drvdata(&op->dev); struct mpc52xx_spi *ms = spi_master_get_devdata(master); + int i; free_irq(ms->irq0, ms); free_irq(ms->irq1, ms); + for (i = 0; i < ms->gpio_cs_count; i++) + gpio_free(ms->gpio_cs[i]); + + if (ms->gpio_cs != NULL) + kfree(ms->gpio_cs); + spi_unregister_master(master); spi_master_put(master); iounmap(ms->regs); -- cgit v1.2.3 From d5af91a1faca68e9a8cc493b85aa7b194b6128aa Mon Sep 17 00:00:00 2001 From: Richard Röjfors Date: Fri, 13 Nov 2009 12:28:39 +0100 Subject: xilinx_spi: Split into of driver and generic part. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch splits the xilinx_spi driver into a generic part and a OF driver part. The reason for this is to later add in a platform driver as well. Tested-by: John Linn Signed-off-by: Richard Röjfors Signed-off-by: Grant Likely --- drivers/spi/Kconfig | 9 ++- drivers/spi/Makefile | 1 + drivers/spi/xilinx_spi.c | 159 ++++++++++------------------------------- drivers/spi/xilinx_spi.h | 32 +++++++++ drivers/spi/xilinx_spi_of.c | 133 ++++++++++++++++++++++++++++++++++ include/linux/spi/xilinx_spi.h | 16 +++++ 6 files changed, 229 insertions(+), 121 deletions(-) create mode 100644 drivers/spi/xilinx_spi.h create mode 100644 drivers/spi/xilinx_spi_of.c create mode 100644 include/linux/spi/xilinx_spi.h (limited to 'drivers/spi') diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 2a4ba1993083..f34a2d16d18f 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -244,14 +244,21 @@ config SPI_TXX9 config SPI_XILINX tristate "Xilinx SPI controller" - depends on (XILINX_VIRTEX || MICROBLAZE) && EXPERIMENTAL + depends on EXPERIMENTAL select SPI_BITBANG + select SPI_XILINX_OF if (XILINX_VIRTEX || MICROBLAZE) help This exposes the SPI controller IP from the Xilinx EDK. See the "OPB Serial Peripheral Interface (SPI) (v1.00e)" Product Specification document (DS464) for hardware details. +config SPI_XILINX_OF + tristate "Xilinx SPI controller OF device" + depends on SPI_XILINX && (XILINX_VIRTEX || MICROBLAZE) + help + This is the OF driver for the SPI controller IP from the Xilinx EDK. + # # Add new SPI master controllers in alphabetical order above this line # diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index e3f092a9afa5..01c409548044 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -32,6 +32,7 @@ obj-$(CONFIG_SPI_S3C24XX_GPIO) += spi_s3c24xx_gpio.o obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx.o obj-$(CONFIG_SPI_TXX9) += spi_txx9.o obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o +obj-$(CONFIG_SPI_XILINX_OF) += xilinx_spi_of.o obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o obj-$(CONFIG_SPI_STMP3XXX) += spi_stmp.o # ... add above this line ... diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c index 5a143b9f6361..69fa26d82ce4 100644 --- a/drivers/spi/xilinx_spi.c +++ b/drivers/spi/xilinx_spi.c @@ -14,16 +14,14 @@ #include #include #include -#include - -#include -#include -#include #include #include #include +#include "xilinx_spi.h" +#include + #define XILINX_SPI_NAME "xilinx_spi" /* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e) @@ -78,7 +76,7 @@ struct xilinx_spi { /* bitbang has to be first */ struct spi_bitbang bitbang; struct completion done; - + struct resource mem; /* phys mem */ void __iomem *regs; /* virt. address of the control registers */ u32 irq; @@ -284,40 +282,22 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id) return IRQ_HANDLED; } -static int __init xilinx_spi_of_probe(struct of_device *ofdev, - const struct of_device_id *match) +struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem, + u32 irq, s16 bus_num) { struct spi_master *master; struct xilinx_spi *xspi; - struct resource r_irq_struct; - struct resource r_mem_struct; - - struct resource *r_irq = &r_irq_struct; - struct resource *r_mem = &r_mem_struct; - int rc = 0; - const u32 *prop; - int len; - - /* Get resources(memory, IRQ) associated with the device */ - master = spi_alloc_master(&ofdev->dev, sizeof(struct xilinx_spi)); + struct xspi_platform_data *pdata = dev->platform_data; + int ret; - if (master == NULL) { - return -ENOMEM; - } - - dev_set_drvdata(&ofdev->dev, master); - - rc = of_address_to_resource(ofdev->node, 0, r_mem); - if (rc) { - dev_warn(&ofdev->dev, "invalid address\n"); - goto put_master; + if (!pdata) { + dev_err(dev, "No platform data attached\n"); + return NULL; } - rc = of_irq_to_resource(ofdev->node, 0, r_irq); - if (rc == NO_IRQ) { - dev_warn(&ofdev->dev, "no IRQ found\n"); - goto put_master; - } + master = spi_alloc_master(dev, sizeof(struct xilinx_spi)); + if (!master) + return NULL; /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA; @@ -330,128 +310,67 @@ static int __init xilinx_spi_of_probe(struct of_device *ofdev, xspi->bitbang.master->setup = xilinx_spi_setup; init_completion(&xspi->done); - xspi->irq = r_irq->start; - - if (!request_mem_region(r_mem->start, - r_mem->end - r_mem->start + 1, XILINX_SPI_NAME)) { - rc = -ENXIO; - dev_warn(&ofdev->dev, "memory request failure\n"); + if (!request_mem_region(mem->start, resource_size(mem), + XILINX_SPI_NAME)) goto put_master; - } - xspi->regs = ioremap(r_mem->start, r_mem->end - r_mem->start + 1); + xspi->regs = ioremap(mem->start, resource_size(mem)); if (xspi->regs == NULL) { - rc = -ENOMEM; - dev_warn(&ofdev->dev, "ioremap failure\n"); - goto release_mem; + dev_warn(dev, "ioremap failure\n"); + goto map_failed; } - xspi->irq = r_irq->start; - /* dynamic bus assignment */ - master->bus_num = -1; + master->bus_num = bus_num; + master->num_chipselect = pdata->num_chipselect; - /* number of slave select bits is required */ - prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len); - if (!prop || len < sizeof(*prop)) { - dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n"); - goto unmap_io; - } - master->num_chipselect = *prop; + xspi->mem = *mem; + xspi->irq = irq; /* SPI controller initializations */ xspi_init_hw(xspi->regs); /* Register for SPI Interrupt */ - rc = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi); - if (rc != 0) { - dev_warn(&ofdev->dev, "irq request failure: %d\n", xspi->irq); + ret = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi); + if (ret) goto unmap_io; - } - rc = spi_bitbang_start(&xspi->bitbang); - if (rc != 0) { - dev_err(&ofdev->dev, "spi_bitbang_start FAILED\n"); + ret = spi_bitbang_start(&xspi->bitbang); + if (ret) { + dev_err(dev, "spi_bitbang_start FAILED\n"); goto free_irq; } - dev_info(&ofdev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n", - (unsigned int)r_mem->start, (u32)xspi->regs, xspi->irq); - - /* Add any subnodes on the SPI bus */ - of_register_spi_devices(master, ofdev->node); - - return rc; + dev_info(dev, "at 0x%08X mapped to 0x%08X, irq=%d\n", + (u32)mem->start, (u32)xspi->regs, xspi->irq); + return master; free_irq: free_irq(xspi->irq, xspi); unmap_io: iounmap(xspi->regs); -release_mem: - release_mem_region(r_mem->start, resource_size(r_mem)); +map_failed: + release_mem_region(mem->start, resource_size(mem)); put_master: spi_master_put(master); - return rc; + return NULL; } +EXPORT_SYMBOL(xilinx_spi_init); -static int __devexit xilinx_spi_remove(struct of_device *ofdev) +void xilinx_spi_deinit(struct spi_master *master) { struct xilinx_spi *xspi; - struct spi_master *master; - struct resource r_mem; - master = platform_get_drvdata(ofdev); xspi = spi_master_get_devdata(master); spi_bitbang_stop(&xspi->bitbang); free_irq(xspi->irq, xspi); iounmap(xspi->regs); - if (!of_address_to_resource(ofdev->node, 0, &r_mem)) - release_mem_region(r_mem.start, resource_size(&r_mem)); - dev_set_drvdata(&ofdev->dev, 0); - spi_master_put(xspi->bitbang.master); - - return 0; -} - -/* work with hotplug and coldplug */ -MODULE_ALIAS("platform:" XILINX_SPI_NAME); - -static int __exit xilinx_spi_of_remove(struct of_device *op) -{ - return xilinx_spi_remove(op); -} -static struct of_device_id xilinx_spi_of_match[] = { - { .compatible = "xlnx,xps-spi-2.00.a", }, - { .compatible = "xlnx,xps-spi-2.00.b", }, - {} -}; - -MODULE_DEVICE_TABLE(of, xilinx_spi_of_match); - -static struct of_platform_driver xilinx_spi_of_driver = { - .owner = THIS_MODULE, - .name = "xilinx-xps-spi", - .match_table = xilinx_spi_of_match, - .probe = xilinx_spi_of_probe, - .remove = __exit_p(xilinx_spi_of_remove), - .driver = { - .name = "xilinx-xps-spi", - .owner = THIS_MODULE, - }, -}; - -static int __init xilinx_spi_init(void) -{ - return of_register_platform_driver(&xilinx_spi_of_driver); + release_mem_region(xspi->mem.start, resource_size(&xspi->mem)); + spi_master_put(xspi->bitbang.master); } -module_init(xilinx_spi_init); +EXPORT_SYMBOL(xilinx_spi_deinit); -static void __exit xilinx_spi_exit(void) -{ - of_unregister_platform_driver(&xilinx_spi_of_driver); -} -module_exit(xilinx_spi_exit); MODULE_AUTHOR("MontaVista Software, Inc. "); MODULE_DESCRIPTION("Xilinx SPI driver"); MODULE_LICENSE("GPL"); diff --git a/drivers/spi/xilinx_spi.h b/drivers/spi/xilinx_spi.h new file mode 100644 index 000000000000..d211accf68d2 --- /dev/null +++ b/drivers/spi/xilinx_spi.h @@ -0,0 +1,32 @@ +/* + * Xilinx SPI device driver API and platform data header file + * + * Copyright (c) 2009 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#ifndef _XILINX_SPI_H_ +#define _XILINX_SPI_H_ + +#include +#include + +#define XILINX_SPI_NAME "xilinx_spi" + +struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem, + u32 irq, s16 bus_num); + +void xilinx_spi_deinit(struct spi_master *master); +#endif diff --git a/drivers/spi/xilinx_spi_of.c b/drivers/spi/xilinx_spi_of.c new file mode 100644 index 000000000000..151aa13494bd --- /dev/null +++ b/drivers/spi/xilinx_spi_of.c @@ -0,0 +1,133 @@ +/* + * Xilinx SPI OF device driver + * + * Copyright (c) 2009 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* Supports: + * Xilinx SPI devices as OF devices + * + * Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc. + */ + +#include +#include +#include +#include + +#include +#include +#include + +#include +#include "xilinx_spi.h" + + +static int __devinit xilinx_spi_of_probe(struct of_device *ofdev, + const struct of_device_id *match) +{ + struct spi_master *master; + struct xspi_platform_data *pdata; + struct resource r_mem; + struct resource r_irq; + int rc = 0; + const u32 *prop; + int len; + + rc = of_address_to_resource(ofdev->node, 0, &r_mem); + if (rc) { + dev_warn(&ofdev->dev, "invalid address\n"); + return rc; + } + + rc = of_irq_to_resource(ofdev->node, 0, &r_irq); + if (rc == NO_IRQ) { + dev_warn(&ofdev->dev, "no IRQ found\n"); + return -ENODEV; + } + + ofdev->dev.platform_data = + kzalloc(sizeof(struct xspi_platform_data), GFP_KERNEL); + pdata = ofdev->dev.platform_data; + if (!pdata) + return -ENOMEM; + + /* number of slave select bits is required */ + prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len); + if (!prop || len < sizeof(*prop)) { + dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n"); + return -EINVAL; + } + pdata->num_chipselect = *prop; + master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1); + if (!master) + return -ENODEV; + + dev_set_drvdata(&ofdev->dev, master); + + /* Add any subnodes on the SPI bus */ + of_register_spi_devices(master, ofdev->node); + + return 0; +} + +static int __devexit xilinx_spi_remove(struct of_device *ofdev) +{ + xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev)); + dev_set_drvdata(&ofdev->dev, 0); + kfree(ofdev->dev.platform_data); + ofdev->dev.platform_data = NULL; + return 0; +} + +static int __exit xilinx_spi_of_remove(struct of_device *op) +{ + return xilinx_spi_remove(op); +} + +static struct of_device_id xilinx_spi_of_match[] = { + { .compatible = "xlnx,xps-spi-2.00.a", }, + { .compatible = "xlnx,xps-spi-2.00.b", }, + {} +}; + +MODULE_DEVICE_TABLE(of, xilinx_spi_of_match); + +static struct of_platform_driver xilinx_spi_of_driver = { + .match_table = xilinx_spi_of_match, + .probe = xilinx_spi_of_probe, + .remove = __exit_p(xilinx_spi_of_remove), + .driver = { + .name = "xilinx-xps-spi", + .owner = THIS_MODULE, + }, +}; + +static int __init xilinx_spi_of_init(void) +{ + return of_register_platform_driver(&xilinx_spi_of_driver); +} +module_init(xilinx_spi_of_init); + +static void __exit xilinx_spi_of_exit(void) +{ + of_unregister_platform_driver(&xilinx_spi_of_driver); +} +module_exit(xilinx_spi_of_exit); + +MODULE_AUTHOR("Mocean Laboratories "); +MODULE_DESCRIPTION("Xilinx SPI platform driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/spi/xilinx_spi.h b/include/linux/spi/xilinx_spi.h new file mode 100644 index 000000000000..06df0aba3aee --- /dev/null +++ b/include/linux/spi/xilinx_spi.h @@ -0,0 +1,16 @@ +#ifndef __LINUX_SPI_XILINX_SPI_H +#define __LINUX_SPI_XILINX_SPI_H + +/** + * struct xspi_platform_data - Platform data of the Xilinx SPI driver + * @num_chipselect: Number of chip select by the IP + * @devices: Devices to add when the driver is probed. + * @num_devices: Number of devices in the devices array. + */ +struct xspi_platform_data { + u16 num_chipselect; + struct spi_board_info *devices; + u8 num_devices; +}; + +#endif /* __LINUX_SPI_XILINX_SPI_H */ -- cgit v1.2.3 From 86fc593599c11b62a11c85b4d7b709089df15c29 Mon Sep 17 00:00:00 2001 From: Richard Röjfors Date: Fri, 13 Nov 2009 12:28:49 +0100 Subject: xilinx_spi: Switch to iomem functions and support little endian. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch changes the out_(be)(8|16|32) and in_(be)(8|16|32) calls to 32 bits ioread/iowrite. The read and write function are attached to the internal struct as callbacks, callback is selected depending on endianess. This will also build on platforms not supporting the in/out calls for instance x86. Acked-by: Grant Likely Tested-by: John Linn Signed-off-by: Richard Röjfors Signed-off-by: Grant Likely --- drivers/spi/Kconfig | 2 +- drivers/spi/xilinx_spi.c | 96 ++++++++++++++++++++++++------------------ include/linux/spi/xilinx_spi.h | 2 + 3 files changed, 57 insertions(+), 43 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index f34a2d16d18f..b528271c72ef 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -244,7 +244,7 @@ config SPI_TXX9 config SPI_XILINX tristate "Xilinx SPI controller" - depends on EXPERIMENTAL + depends on HAS_IOMEM && EXPERIMENTAL select SPI_BITBANG select SPI_XILINX_OF if (XILINX_VIRTEX || MICROBLAZE) help diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c index 69fa26d82ce4..135a3a5931a4 100644 --- a/drivers/spi/xilinx_spi.c +++ b/drivers/spi/xilinx_spi.c @@ -27,7 +27,7 @@ /* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e) * Product Specification", DS464 */ -#define XSPI_CR_OFFSET 0x62 /* 16-bit Control Register */ +#define XSPI_CR_OFFSET 0x60 /* 16-bit Control Register */ #define XSPI_CR_ENABLE 0x02 #define XSPI_CR_MASTER_MODE 0x04 @@ -39,7 +39,7 @@ #define XSPI_CR_MANUAL_SSELECT 0x80 #define XSPI_CR_TRANS_INHIBIT 0x100 -#define XSPI_SR_OFFSET 0x67 /* 8-bit Status Register */ +#define XSPI_SR_OFFSET 0x64 /* 8-bit Status Register */ #define XSPI_SR_RX_EMPTY_MASK 0x01 /* Receive FIFO is empty */ #define XSPI_SR_RX_FULL_MASK 0x02 /* Receive FIFO is full */ @@ -47,8 +47,8 @@ #define XSPI_SR_TX_FULL_MASK 0x08 /* Transmit FIFO is full */ #define XSPI_SR_MODE_FAULT_MASK 0x10 /* Mode fault error */ -#define XSPI_TXD_OFFSET 0x6b /* 8-bit Data Transmit Register */ -#define XSPI_RXD_OFFSET 0x6f /* 8-bit Data Receive Register */ +#define XSPI_TXD_OFFSET 0x68 /* 8-bit Data Transmit Register */ +#define XSPI_RXD_OFFSET 0x6c /* 8-bit Data Receive Register */ #define XSPI_SSR_OFFSET 0x70 /* 32-bit Slave Select Register */ @@ -86,25 +86,29 @@ struct xilinx_spi { u8 *rx_ptr; /* pointer in the Tx buffer */ const u8 *tx_ptr; /* pointer in the Rx buffer */ int remaining_bytes; /* the number of bytes left to transfer */ + unsigned int (*read_fn) (void __iomem *); + void (*write_fn) (u32, void __iomem *); }; -static void xspi_init_hw(void __iomem *regs_base) +static void xspi_init_hw(struct xilinx_spi *xspi) { + void __iomem *regs_base = xspi->regs; + /* Reset the SPI device */ - out_be32(regs_base + XIPIF_V123B_RESETR_OFFSET, - XIPIF_V123B_RESET_MASK); + xspi->write_fn(XIPIF_V123B_RESET_MASK, + regs_base + XIPIF_V123B_RESETR_OFFSET); /* Disable all the interrupts just in case */ - out_be32(regs_base + XIPIF_V123B_IIER_OFFSET, 0); + xspi->write_fn(0, regs_base + XIPIF_V123B_IIER_OFFSET); /* Enable the global IPIF interrupt */ - out_be32(regs_base + XIPIF_V123B_DGIER_OFFSET, - XIPIF_V123B_GINTR_ENABLE); + xspi->write_fn(XIPIF_V123B_GINTR_ENABLE, + regs_base + XIPIF_V123B_DGIER_OFFSET); /* Deselect the slave on the SPI bus */ - out_be32(regs_base + XSPI_SSR_OFFSET, 0xffff); + xspi->write_fn(0xffff, regs_base + XSPI_SSR_OFFSET); /* Disable the transmitter, enable Manual Slave Select Assertion, * put SPI controller into master mode, and enable it */ - out_be16(regs_base + XSPI_CR_OFFSET, - XSPI_CR_TRANS_INHIBIT | XSPI_CR_MANUAL_SSELECT - | XSPI_CR_MASTER_MODE | XSPI_CR_ENABLE); + xspi->write_fn(XSPI_CR_TRANS_INHIBIT | XSPI_CR_MANUAL_SSELECT | + XSPI_CR_MASTER_MODE | XSPI_CR_ENABLE, + regs_base + XSPI_CR_OFFSET); } static void xilinx_spi_chipselect(struct spi_device *spi, int is_on) @@ -113,16 +117,16 @@ static void xilinx_spi_chipselect(struct spi_device *spi, int is_on) if (is_on == BITBANG_CS_INACTIVE) { /* Deselect the slave on the SPI bus */ - out_be32(xspi->regs + XSPI_SSR_OFFSET, 0xffff); + xspi->write_fn(0xffff, xspi->regs + XSPI_SSR_OFFSET); } else if (is_on == BITBANG_CS_ACTIVE) { /* Set the SPI clock phase and polarity */ - u16 cr = in_be16(xspi->regs + XSPI_CR_OFFSET) + u16 cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET) & ~XSPI_CR_MODE_MASK; if (spi->mode & SPI_CPHA) cr |= XSPI_CR_CPHA; if (spi->mode & SPI_CPOL) cr |= XSPI_CR_CPOL; - out_be16(xspi->regs + XSPI_CR_OFFSET, cr); + xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); /* We do not check spi->max_speed_hz here as the SPI clock * frequency is not software programmable (the IP block design @@ -130,8 +134,8 @@ static void xilinx_spi_chipselect(struct spi_device *spi, int is_on) */ /* Activate the chip select */ - out_be32(xspi->regs + XSPI_SSR_OFFSET, - ~(0x0001 << spi->chip_select)); + xspi->write_fn(~(0x0001 << spi->chip_select), + xspi->regs + XSPI_SSR_OFFSET); } } @@ -178,15 +182,15 @@ static void xilinx_spi_fill_tx_fifo(struct xilinx_spi *xspi) u8 sr; /* Fill the Tx FIFO with as many bytes as possible */ - sr = in_8(xspi->regs + XSPI_SR_OFFSET); + sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); while ((sr & XSPI_SR_TX_FULL_MASK) == 0 && xspi->remaining_bytes > 0) { - if (xspi->tx_ptr) { - out_8(xspi->regs + XSPI_TXD_OFFSET, *xspi->tx_ptr++); - } else { - out_8(xspi->regs + XSPI_TXD_OFFSET, 0); - } + if (xspi->tx_ptr) + xspi->write_fn(*xspi->tx_ptr++, + xspi->regs + XSPI_TXD_OFFSET); + else + xspi->write_fn(0, xspi->regs + XSPI_TXD_OFFSET); xspi->remaining_bytes--; - sr = in_8(xspi->regs + XSPI_SR_OFFSET); + sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); } } @@ -208,18 +212,19 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) /* Enable the transmit empty interrupt, which we use to determine * progress on the transmission. */ - ipif_ier = in_be32(xspi->regs + XIPIF_V123B_IIER_OFFSET); - out_be32(xspi->regs + XIPIF_V123B_IIER_OFFSET, - ipif_ier | XSPI_INTR_TX_EMPTY); + ipif_ier = xspi->read_fn(xspi->regs + XIPIF_V123B_IIER_OFFSET); + xspi->write_fn(ipif_ier | XSPI_INTR_TX_EMPTY, + xspi->regs + XIPIF_V123B_IIER_OFFSET); /* Start the transfer by not inhibiting the transmitter any longer */ - cr = in_be16(xspi->regs + XSPI_CR_OFFSET) & ~XSPI_CR_TRANS_INHIBIT; - out_be16(xspi->regs + XSPI_CR_OFFSET, cr); + cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET) & + ~XSPI_CR_TRANS_INHIBIT; + xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); wait_for_completion(&xspi->done); /* Disable the transmit empty interrupt */ - out_be32(xspi->regs + XIPIF_V123B_IIER_OFFSET, ipif_ier); + xspi->write_fn(ipif_ier, xspi->regs + XIPIF_V123B_IIER_OFFSET); return t->len - xspi->remaining_bytes; } @@ -236,8 +241,8 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id) u32 ipif_isr; /* Get the IPIF interrupts, and clear them immediately */ - ipif_isr = in_be32(xspi->regs + XIPIF_V123B_IISR_OFFSET); - out_be32(xspi->regs + XIPIF_V123B_IISR_OFFSET, ipif_isr); + ipif_isr = xspi->read_fn(xspi->regs + XIPIF_V123B_IISR_OFFSET); + xspi->write_fn(ipif_isr, xspi->regs + XIPIF_V123B_IISR_OFFSET); if (ipif_isr & XSPI_INTR_TX_EMPTY) { /* Transmission completed */ u16 cr; @@ -248,20 +253,20 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id) * transmitter while the Isr refills the transmit register/FIFO, * or make sure it is stopped if we're done. */ - cr = in_be16(xspi->regs + XSPI_CR_OFFSET); - out_be16(xspi->regs + XSPI_CR_OFFSET, - cr | XSPI_CR_TRANS_INHIBIT); + cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET); + xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT, + xspi->regs + XSPI_CR_OFFSET); /* Read out all the data from the Rx FIFO */ - sr = in_8(xspi->regs + XSPI_SR_OFFSET); + sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); while ((sr & XSPI_SR_RX_EMPTY_MASK) == 0) { u8 data; - data = in_8(xspi->regs + XSPI_RXD_OFFSET); + data = xspi->read_fn(xspi->regs + XSPI_RXD_OFFSET); if (xspi->rx_ptr) { *xspi->rx_ptr++ = data; } - sr = in_8(xspi->regs + XSPI_SR_OFFSET); + sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); } /* See if there is more data to send */ @@ -270,7 +275,7 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id) /* Start the transfer by not inhibiting the * transmitter any longer */ - out_be16(xspi->regs + XSPI_CR_OFFSET, cr); + xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET); } else { /* No more data to send. * Indicate the transfer is completed. @@ -325,9 +330,16 @@ struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem, xspi->mem = *mem; xspi->irq = irq; + if (pdata->little_endian) { + xspi->read_fn = ioread32; + xspi->write_fn = iowrite32; + } else { + xspi->read_fn = ioread32be; + xspi->write_fn = iowrite32be; + } /* SPI controller initializations */ - xspi_init_hw(xspi->regs); + xspi_init_hw(xspi); /* Register for SPI Interrupt */ ret = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi); diff --git a/include/linux/spi/xilinx_spi.h b/include/linux/spi/xilinx_spi.h index 06df0aba3aee..a705ad85eebe 100644 --- a/include/linux/spi/xilinx_spi.h +++ b/include/linux/spi/xilinx_spi.h @@ -4,11 +4,13 @@ /** * struct xspi_platform_data - Platform data of the Xilinx SPI driver * @num_chipselect: Number of chip select by the IP + * @little_endian If registers should be accessed little endian or not * @devices: Devices to add when the driver is probed. * @num_devices: Number of devices in the devices array. */ struct xspi_platform_data { u16 num_chipselect; + bool little_endian; struct spi_board_info *devices; u8 num_devices; }; -- cgit v1.2.3 From c9da2e125588677d74324df5088149063d578e8f Mon Sep 17 00:00:00 2001 From: Richard Röjfors Date: Fri, 13 Nov 2009 12:28:55 +0100 Subject: xilinx_spi: add support for the DS570 IP. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch adds in support for the DS570 IP. It's register compatible with the DS464, but adds support for 8/16/32 SPI. The 8/16/32 support is added by attaching callbacks reading/writing the proper amount of data. To indicate to the driver which amount of bits to use a new field is introduced in the platform data struct. Acked-by: Grant Likely Tested-by: John Linn Signed-off-by: Richard Röjfors Signed-off-by: Grant Likely --- drivers/spi/Kconfig | 4 +- drivers/spi/xilinx_spi.c | 118 ++++++++++++++++++++++++++++++----------- drivers/spi/xilinx_spi_of.c | 1 + include/linux/spi/xilinx_spi.h | 6 ++- 4 files changed, 95 insertions(+), 34 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index b528271c72ef..4dda097c239e 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -243,7 +243,7 @@ config SPI_TXX9 SPI driver for Toshiba TXx9 MIPS SoCs config SPI_XILINX - tristate "Xilinx SPI controller" + tristate "Xilinx SPI controller common module" depends on HAS_IOMEM && EXPERIMENTAL select SPI_BITBANG select SPI_XILINX_OF if (XILINX_VIRTEX || MICROBLAZE) @@ -253,6 +253,8 @@ config SPI_XILINX See the "OPB Serial Peripheral Interface (SPI) (v1.00e)" Product Specification document (DS464) for hardware details. + Or for the DS570, see "XPS Serial Peripheral Interface (SPI) (v2.00b)" + config SPI_XILINX_OF tristate "Xilinx SPI controller OF device" depends on SPI_XILINX && (XILINX_VIRTEX || MICROBLAZE) diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c index 135a3a5931a4..b927812822c1 100644 --- a/drivers/spi/xilinx_spi.c +++ b/drivers/spi/xilinx_spi.c @@ -27,7 +27,7 @@ /* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e) * Product Specification", DS464 */ -#define XSPI_CR_OFFSET 0x60 /* 16-bit Control Register */ +#define XSPI_CR_OFFSET 0x60 /* Control Register */ #define XSPI_CR_ENABLE 0x02 #define XSPI_CR_MASTER_MODE 0x04 @@ -38,8 +38,9 @@ #define XSPI_CR_RXFIFO_RESET 0x40 #define XSPI_CR_MANUAL_SSELECT 0x80 #define XSPI_CR_TRANS_INHIBIT 0x100 +#define XSPI_CR_LSB_FIRST 0x200 -#define XSPI_SR_OFFSET 0x64 /* 8-bit Status Register */ +#define XSPI_SR_OFFSET 0x64 /* Status Register */ #define XSPI_SR_RX_EMPTY_MASK 0x01 /* Receive FIFO is empty */ #define XSPI_SR_RX_FULL_MASK 0x02 /* Receive FIFO is full */ @@ -47,8 +48,8 @@ #define XSPI_SR_TX_FULL_MASK 0x08 /* Transmit FIFO is full */ #define XSPI_SR_MODE_FAULT_MASK 0x10 /* Mode fault error */ -#define XSPI_TXD_OFFSET 0x68 /* 8-bit Data Transmit Register */ -#define XSPI_RXD_OFFSET 0x6c /* 8-bit Data Receive Register */ +#define XSPI_TXD_OFFSET 0x68 /* Data Transmit Register */ +#define XSPI_RXD_OFFSET 0x6c /* Data Receive Register */ #define XSPI_SSR_OFFSET 0x70 /* 32-bit Slave Select Register */ @@ -68,6 +69,7 @@ #define XSPI_INTR_TX_UNDERRUN 0x08 /* TxFIFO was underrun */ #define XSPI_INTR_RX_FULL 0x10 /* RxFIFO is full */ #define XSPI_INTR_RX_OVERRUN 0x20 /* RxFIFO was overrun */ +#define XSPI_INTR_TX_HALF_EMPTY 0x40 /* TxFIFO is half empty */ #define XIPIF_V123B_RESETR_OFFSET 0x40 /* IPIF reset register */ #define XIPIF_V123B_RESET_MASK 0x0a /* the value to write */ @@ -81,15 +83,61 @@ struct xilinx_spi { u32 irq; - u32 speed_hz; /* SCK has a fixed frequency of speed_hz Hz */ - u8 *rx_ptr; /* pointer in the Tx buffer */ const u8 *tx_ptr; /* pointer in the Rx buffer */ int remaining_bytes; /* the number of bytes left to transfer */ + u8 bits_per_word; unsigned int (*read_fn) (void __iomem *); void (*write_fn) (u32, void __iomem *); + void (*tx_fn) (struct xilinx_spi *); + void (*rx_fn) (struct xilinx_spi *); }; +static void xspi_tx8(struct xilinx_spi *xspi) +{ + xspi->write_fn(*xspi->tx_ptr, xspi->regs + XSPI_TXD_OFFSET); + xspi->tx_ptr++; +} + +static void xspi_tx16(struct xilinx_spi *xspi) +{ + xspi->write_fn(*(u16 *)(xspi->tx_ptr), xspi->regs + XSPI_TXD_OFFSET); + xspi->tx_ptr += 2; +} + +static void xspi_tx32(struct xilinx_spi *xspi) +{ + xspi->write_fn(*(u32 *)(xspi->tx_ptr), xspi->regs + XSPI_TXD_OFFSET); + xspi->tx_ptr += 4; +} + +static void xspi_rx8(struct xilinx_spi *xspi) +{ + u32 data = xspi->read_fn(xspi->regs + XSPI_RXD_OFFSET); + if (xspi->rx_ptr) { + *xspi->rx_ptr = data & 0xff; + xspi->rx_ptr++; + } +} + +static void xspi_rx16(struct xilinx_spi *xspi) +{ + u32 data = xspi->read_fn(xspi->regs + XSPI_RXD_OFFSET); + if (xspi->rx_ptr) { + *(u16 *)(xspi->rx_ptr) = data & 0xffff; + xspi->rx_ptr += 2; + } +} + +static void xspi_rx32(struct xilinx_spi *xspi) +{ + u32 data = xspi->read_fn(xspi->regs + XSPI_RXD_OFFSET); + if (xspi->rx_ptr) { + *(u32 *)(xspi->rx_ptr) = data; + xspi->rx_ptr += 4; + } +} + static void xspi_init_hw(struct xilinx_spi *xspi) { void __iomem *regs_base = xspi->regs; @@ -107,8 +155,8 @@ static void xspi_init_hw(struct xilinx_spi *xspi) /* Disable the transmitter, enable Manual Slave Select Assertion, * put SPI controller into master mode, and enable it */ xspi->write_fn(XSPI_CR_TRANS_INHIBIT | XSPI_CR_MANUAL_SSELECT | - XSPI_CR_MASTER_MODE | XSPI_CR_ENABLE, - regs_base + XSPI_CR_OFFSET); + XSPI_CR_MASTER_MODE | XSPI_CR_ENABLE | XSPI_CR_TXFIFO_RESET | + XSPI_CR_RXFIFO_RESET, regs_base + XSPI_CR_OFFSET); } static void xilinx_spi_chipselect(struct spi_device *spi, int is_on) @@ -141,18 +189,20 @@ static void xilinx_spi_chipselect(struct spi_device *spi, int is_on) /* spi_bitbang requires custom setup_transfer() to be defined if there is a * custom txrx_bufs(). We have nothing to setup here as the SPI IP block - * supports just 8 bits per word, and SPI clock can't be changed in software. - * Check for 8 bits per word. Chip select delay calculations could be + * supports 8 or 16 bits per word which cannot be changed in software. + * SPI clock can't be changed in software either. + * Check for correct bits per word. Chip select delay calculations could be * added here as soon as bitbang_work() can be made aware of the delay value. */ static int xilinx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) { + struct xilinx_spi *xspi = spi_master_get_devdata(spi->master); u8 bits_per_word; bits_per_word = (t && t->bits_per_word) ? t->bits_per_word : spi->bits_per_word; - if (bits_per_word != 8) { + if (bits_per_word != xspi->bits_per_word) { dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n", __func__, bits_per_word); return -EINVAL; @@ -163,17 +213,16 @@ static int xilinx_spi_setup_transfer(struct spi_device *spi, static int xilinx_spi_setup(struct spi_device *spi) { - struct spi_bitbang *bitbang; - struct xilinx_spi *xspi; - int retval; - - xspi = spi_master_get_devdata(spi->master); - bitbang = &xspi->bitbang; - - retval = xilinx_spi_setup_transfer(spi, NULL); - if (retval < 0) - return retval; - + /* always return 0, we can not check the number of bits. + * There are cases when SPI setup is called before any driver is + * there, in that case the SPI core defaults to 8 bits, which we + * do not support in some cases. But if we return an error, the + * SPI device would not be registered and no driver can get hold of it + * When the driver is there, it will call SPI setup again with the + * correct number of bits per transfer. + * If a driver setups with the wrong bit number, it will fail when + * it tries to do a transfer + */ return 0; } @@ -185,11 +234,10 @@ static void xilinx_spi_fill_tx_fifo(struct xilinx_spi *xspi) sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); while ((sr & XSPI_SR_TX_FULL_MASK) == 0 && xspi->remaining_bytes > 0) { if (xspi->tx_ptr) - xspi->write_fn(*xspi->tx_ptr++, - xspi->regs + XSPI_TXD_OFFSET); + xspi->tx_fn(xspi); else xspi->write_fn(0, xspi->regs + XSPI_TXD_OFFSET); - xspi->remaining_bytes--; + xspi->remaining_bytes -= xspi->bits_per_word / 8; sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); } } @@ -260,12 +308,7 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id) /* Read out all the data from the Rx FIFO */ sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); while ((sr & XSPI_SR_RX_EMPTY_MASK) == 0) { - u8 data; - - data = xspi->read_fn(xspi->regs + XSPI_RXD_OFFSET); - if (xspi->rx_ptr) { - *xspi->rx_ptr++ = data; - } + xspi->rx_fn(xspi); sr = xspi->read_fn(xspi->regs + XSPI_SR_OFFSET); } @@ -337,6 +380,19 @@ struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem, xspi->read_fn = ioread32be; xspi->write_fn = iowrite32be; } + xspi->bits_per_word = pdata->bits_per_word; + if (xspi->bits_per_word == 8) { + xspi->tx_fn = xspi_tx8; + xspi->rx_fn = xspi_rx8; + } else if (xspi->bits_per_word == 16) { + xspi->tx_fn = xspi_tx16; + xspi->rx_fn = xspi_rx16; + } else if (xspi->bits_per_word == 32) { + xspi->tx_fn = xspi_tx32; + xspi->rx_fn = xspi_rx32; + } else + goto unmap_io; + /* SPI controller initializations */ xspi_init_hw(xspi); diff --git a/drivers/spi/xilinx_spi_of.c b/drivers/spi/xilinx_spi_of.c index 151aa13494bd..71dc3adc0495 100644 --- a/drivers/spi/xilinx_spi_of.c +++ b/drivers/spi/xilinx_spi_of.c @@ -72,6 +72,7 @@ static int __devinit xilinx_spi_of_probe(struct of_device *ofdev, return -EINVAL; } pdata->num_chipselect = *prop; + pdata->bits_per_word = 8; master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1); if (!master) return -ENODEV; diff --git a/include/linux/spi/xilinx_spi.h b/include/linux/spi/xilinx_spi.h index a705ad85eebe..6f17278810b0 100644 --- a/include/linux/spi/xilinx_spi.h +++ b/include/linux/spi/xilinx_spi.h @@ -3,14 +3,16 @@ /** * struct xspi_platform_data - Platform data of the Xilinx SPI driver - * @num_chipselect: Number of chip select by the IP - * @little_endian If registers should be accessed little endian or not + * @num_chipselect: Number of chip select by the IP. + * @little_endian: If registers should be accessed little endian or not. + * @bits_per_word: Number of bits per word. * @devices: Devices to add when the driver is probed. * @num_devices: Number of devices in the devices array. */ struct xspi_platform_data { u16 num_chipselect; bool little_endian; + u8 bits_per_word; struct spi_board_info *devices; u8 num_devices; }; -- cgit v1.2.3 From 771669349e6cec0e29a18dc0b5a108e81b85d58c Mon Sep 17 00:00:00 2001 From: Richard Röjfors Date: Fri, 13 Nov 2009 12:29:00 +0100 Subject: xilinx_spi: add a platform driver using the xilinx_spi common module. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch adds in a platform device driver using the xilinx_spi common module. Tested-by: John Linn Signed-off-by: Richard Röjfors Signed-off-by: Grant Likely --- drivers/spi/Kconfig | 7 +++ drivers/spi/Makefile | 1 + drivers/spi/xilinx_spi_pltfm.c | 102 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 110 insertions(+) create mode 100644 drivers/spi/xilinx_spi_pltfm.c (limited to 'drivers/spi') diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 4dda097c239e..c00f9e5b9df8 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -261,6 +261,13 @@ config SPI_XILINX_OF help This is the OF driver for the SPI controller IP from the Xilinx EDK. +config SPI_XILINX_PLTFM + tristate "Xilinx SPI controller platform device" + depends on SPI_XILINX + help + This is the platform driver for the SPI controller IP + from the Xilinx EDK. + # # Add new SPI master controllers in alphabetical order above this line # diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 01c409548044..2f2bebc63b64 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -33,6 +33,7 @@ obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx.o obj-$(CONFIG_SPI_TXX9) += spi_txx9.o obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o obj-$(CONFIG_SPI_XILINX_OF) += xilinx_spi_of.o +obj-$(CONFIG_SPI_XILINX_PLTFM) += xilinx_spi_pltfm.o obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o obj-$(CONFIG_SPI_STMP3XXX) += spi_stmp.o # ... add above this line ... diff --git a/drivers/spi/xilinx_spi_pltfm.c b/drivers/spi/xilinx_spi_pltfm.c new file mode 100644 index 000000000000..24debac646a9 --- /dev/null +++ b/drivers/spi/xilinx_spi_pltfm.c @@ -0,0 +1,102 @@ +/* + * Support for Xilinx SPI platform devices + * Copyright (c) 2009 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* Supports: + * Xilinx SPI devices as platform devices + * + * Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc. + */ + +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "xilinx_spi.h" + +static int __devinit xilinx_spi_probe(struct platform_device *dev) +{ + struct xspi_platform_data *pdata; + struct resource *r; + int irq; + struct spi_master *master; + u8 i; + + pdata = dev->dev.platform_data; + if (!pdata) + return -ENODEV; + + r = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!r) + return -ENODEV; + + irq = platform_get_irq(dev, 0); + if (irq < 0) + return -ENXIO; + + master = xilinx_spi_init(&dev->dev, r, irq, dev->id); + if (!master) + return -ENODEV; + + for (i = 0; i < pdata->num_devices; i++) + spi_new_device(master, pdata->devices + i); + + platform_set_drvdata(dev, master); + return 0; +} + +static int __devexit xilinx_spi_remove(struct platform_device *dev) +{ + xilinx_spi_deinit(platform_get_drvdata(dev)); + platform_set_drvdata(dev, 0); + + return 0; +} + +/* work with hotplug and coldplug */ +MODULE_ALIAS("platform:" XILINX_SPI_NAME); + +static struct platform_driver xilinx_spi_driver = { + .probe = xilinx_spi_probe, + .remove = __devexit_p(xilinx_spi_remove), + .driver = { + .name = XILINX_SPI_NAME, + .owner = THIS_MODULE, + }, +}; + +static int __init xilinx_spi_pltfm_init(void) +{ + return platform_driver_register(&xilinx_spi_driver); +} +module_init(xilinx_spi_pltfm_init); + +static void __exit xilinx_spi_pltfm_exit(void) +{ + platform_driver_unregister(&xilinx_spi_driver); +} +module_exit(xilinx_spi_pltfm_exit); + +MODULE_AUTHOR("Mocean Laboratories "); +MODULE_DESCRIPTION("Xilinx SPI platform driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3 From 937041e21634ffecc92d05cf693423a2c95b7252 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Tue, 24 Nov 2009 17:18:31 -0700 Subject: spi/mpc52xx-spi: minor cleanups - drop own, obsolete include-file - drop IRQF_SAMPLE_RANDOM (deprecated feature) - drop 'if' above kfree() - typos, braces & whitespaces Signed-off-by: Wolfram Sang Acked-by: Luotao Fu Signed-off-by: Grant Likely --- drivers/spi/mpc52xx_spi.c | 26 +++++++++++--------------- include/linux/spi/mpc52xx_spi.h | 10 ---------- 2 files changed, 11 insertions(+), 25 deletions(-) delete mode 100644 include/linux/spi/mpc52xx_spi.h (limited to 'drivers/spi') diff --git a/drivers/spi/mpc52xx_spi.c b/drivers/spi/mpc52xx_spi.c index 97beba2895e7..45bfe6458173 100644 --- a/drivers/spi/mpc52xx_spi.c +++ b/drivers/spi/mpc52xx_spi.c @@ -18,7 +18,6 @@ #include #include #include -#include #include #include #include @@ -54,7 +53,7 @@ MODULE_LICENSE("GPL"); /* FSM state return values */ #define FSM_STOP 0 /* Nothing more for the state machine to */ /* do. If something interesting happens */ - /* then and IRQ will be received */ + /* then an IRQ will be received */ #define FSM_POLL 1 /* need to poll for completion, an IRQ is */ /* not expected */ #define FSM_CONTINUE 2 /* Keep iterating the state machine */ @@ -62,13 +61,12 @@ MODULE_LICENSE("GPL"); /* Driver internal data */ struct mpc52xx_spi { struct spi_master *master; - u32 sysclk; void __iomem *regs; int irq0; /* MODF irq */ int irq1; /* SPIF irq */ - int ipb_freq; + unsigned int ipb_freq; - /* Statistics */ + /* Statistics; not used now, but will be reintroduced for debugfs */ int msg_count; int wcol_count; int wcol_ticks; @@ -229,7 +227,7 @@ static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms, ms->wcol_tx_timestamp = get_tbl(); data = 0; if (ms->tx_buf) - data = *(ms->tx_buf-1); + data = *(ms->tx_buf - 1); out_8(ms->regs + SPI_DATA, data); /* try again */ return FSM_CONTINUE; } else if (status & SPI_STATUS_MODF) { @@ -481,8 +479,9 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, gpio_direction_output(gpio_cs, 1); ms->gpio_cs[i] = gpio_cs; } - } else + } else { master->num_chipselect = 1; + } spin_lock_init(&ms->lock); INIT_LIST_HEAD(&ms->queue); @@ -490,10 +489,10 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, /* Decide if interrupts can be used */ if (ms->irq0 && ms->irq1) { - rc = request_irq(ms->irq0, mpc52xx_spi_irq, IRQF_SAMPLE_RANDOM, + rc = request_irq(ms->irq0, mpc52xx_spi_irq, 0, "mpc5200-spi-modf", ms); - rc |= request_irq(ms->irq1, mpc52xx_spi_irq, IRQF_SAMPLE_RANDOM, - "mpc5200-spi-spiF", ms); + rc |= request_irq(ms->irq1, mpc52xx_spi_irq, 0, + "mpc5200-spi-spif", ms); if (rc) { free_irq(ms->irq0, ms); free_irq(ms->irq1, ms); @@ -524,8 +523,7 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op, while (i-- > 0) gpio_free(ms->gpio_cs[i]); - if (ms->gpio_cs != NULL) - kfree(ms->gpio_cs); + kfree(ms->gpio_cs); err_alloc: err_init: iounmap(regs); @@ -544,9 +542,7 @@ static int __devexit mpc52xx_spi_remove(struct of_device *op) for (i = 0; i < ms->gpio_cs_count; i++) gpio_free(ms->gpio_cs[i]); - if (ms->gpio_cs != NULL) - kfree(ms->gpio_cs); - + kfree(ms->gpio_cs); spi_unregister_master(master); spi_master_put(master); iounmap(ms->regs); diff --git a/include/linux/spi/mpc52xx_spi.h b/include/linux/spi/mpc52xx_spi.h deleted file mode 100644 index d1004cf09241..000000000000 --- a/include/linux/spi/mpc52xx_spi.h +++ /dev/null @@ -1,10 +0,0 @@ - -#ifndef INCLUDE_MPC5200_SPI_H -#define INCLUDE_MPC5200_SPI_H - -extern void mpc52xx_spi_set_premessage_hook(struct spi_master *master, - void (*hook)(struct spi_message *m, - void *context), - void *hook_context); - -#endif -- cgit v1.2.3 From 920712af498a3081a9ac8256951d1c7eae109c50 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Wed, 25 Nov 2009 07:23:35 -0700 Subject: spi/xilinx_spi: fix incorrect casting This patch fixes the error exposed by the following build warning: drivers/spi/xilinx_spi.c: In function 'xilinx_spi_init': drivers/spi/xilinx_spi.c:411: warning: cast from pointer to integer of different size Fixed by change %x to %p in the format string. Signed-off-by: Grant Likely --- drivers/spi/xilinx_spi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c index b927812822c1..9f386379c169 100644 --- a/drivers/spi/xilinx_spi.c +++ b/drivers/spi/xilinx_spi.c @@ -408,8 +408,8 @@ struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem, goto free_irq; } - dev_info(dev, "at 0x%08X mapped to 0x%08X, irq=%d\n", - (u32)mem->start, (u32)xspi->regs, xspi->irq); + dev_info(dev, "at 0x%08llX mapped to 0x%p, irq=%d\n", + (unsigned long long)mem->start, xspi->regs, xspi->irq); return master; free_irq: -- cgit v1.2.3 From ce1807b2e527979bd77d8a1a1768a6365f3febb5 Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Thu, 19 Nov 2009 19:01:42 +0000 Subject: spi/i.mx: drain MXC SPI transfer buffer when probing device MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On the MX31litekit, the bootloader seems to communicate with the MC13783 PMIC chip before booting Linux. However, it does not flush all the buffers properly after that, which makes the imx-spi driver read bogus data when probing the MC13783. Fix that by draining the SPI receive buffer on startup. Signed-off-by: Daniel Mack Acked-by: Uwe Kleine-König Signed-off-by: Grant Likely --- drivers/spi/spi_imx.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/spi') diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index 89c22efedfb0..1b17f443dee7 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -44,6 +44,9 @@ #define MXC_CSPIINT 0x0c #define MXC_RESET 0x1c +#define MX3_CSPISTAT 0x14 +#define MX3_CSPISTAT_RR (1 << 3) + /* generic defines to abstract from the different register layouts */ #define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */ #define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */ @@ -593,6 +596,11 @@ static int __init spi_imx_probe(struct platform_device *pdev) if (!cpu_is_mx31() || !cpu_is_mx35()) writel(1, spi_imx->base + MXC_RESET); + /* drain receive buffer */ + if (cpu_is_mx31() || cpu_is_mx35()) + while (readl(spi_imx->base + MX3_CSPISTAT) & MX3_CSPISTAT_RR) + readl(spi_imx->base + MXC_CSPIRXDATA); + spi_imx->intctrl(spi_imx, 0); ret = spi_bitbang_start(&spi_imx->bitbang); -- cgit v1.2.3 From bbd050af0e2b7d77bfc959cf76219eb71c3b982a Mon Sep 17 00:00:00 2001 From: John Ogness Date: Tue, 24 Nov 2009 16:53:07 +0000 Subject: spi/i.MX: fix broken error handling for gpio_request i.MX35-provided chipselects are represented using negative numbers. If gpio_request() fails and the previous chipselect was a negative number, the while loop is endless (i is never decremented). Also, the error loop would never call gpio_free on chipselect[0]. And finally, the error message was missing an endline. Signed-off-by: John Ogness Signed-off-by: Grant Likely --- drivers/spi/spi_imx.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index 1b17f443dee7..8ffa48ce570c 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -516,11 +516,12 @@ static int __init spi_imx_probe(struct platform_device *pdev) continue; ret = gpio_request(spi_imx->chipselect[i], DRIVER_NAME); if (ret) { - i--; - while (i > 0) + while (i > 0) { + i--; if (spi_imx->chipselect[i] >= 0) - gpio_free(spi_imx->chipselect[i--]); - dev_err(&pdev->dev, "can't get cs gpios"); + gpio_free(spi_imx->chipselect[i]); + } + dev_err(&pdev->dev, "can't get cs gpios\n"); goto out_master_put; } } -- cgit v1.2.3 From b3a08945166adc8515a8c7927fbf0df264db5b63 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 24 Nov 2009 21:07:27 +0000 Subject: spi/mpc8xxx: don't use __exit_p to wrap plat_mpc8xxx_spi_remove MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The function plat_mpc8xxx_spi_remove is defined using __devexit, so don't use __exit_p but __devexit_p to wrap it. Signed-off-by: Uwe Kleine-König Signed-off-by: Grant Likely --- drivers/spi/spi_mpc8xxx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c index 0fd0ec4d3a7d..1d98be9b1946 100644 --- a/drivers/spi/spi_mpc8xxx.c +++ b/drivers/spi/spi_mpc8xxx.c @@ -900,7 +900,7 @@ static int __devexit plat_mpc8xxx_spi_remove(struct platform_device *pdev) MODULE_ALIAS("platform:mpc8xxx_spi"); static struct platform_driver mpc8xxx_spi_driver = { .probe = plat_mpc8xxx_spi_probe, - .remove = __exit_p(plat_mpc8xxx_spi_remove), + .remove = __devexit_p(plat_mpc8xxx_spi_remove), .driver = { .name = "mpc8xxx_spi", .owner = THIS_MODULE, -- cgit v1.2.3 From 04ba24b34ac8ea4885295a7f7f78f719bc8c859b Mon Sep 17 00:00:00 2001 From: Jan Nikitenko Date: Mon, 7 Dec 2009 12:50:30 +0000 Subject: spi/au1550_spi: fix setupxfer not to override cfg with zeros fix setupxfer() not to override generic configuration of speed_hz and bits_per_word with zeros Signed-off-by: Jan Nikitenko Signed-off-by: Grant Likely --- drivers/spi/au1550_spi.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/au1550_spi.c b/drivers/spi/au1550_spi.c index 76cbc1a66598..cfd5ff9508fa 100644 --- a/drivers/spi/au1550_spi.c +++ b/drivers/spi/au1550_spi.c @@ -237,8 +237,14 @@ static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t) unsigned bpw, hz; u32 cfg, stat; - bpw = t ? t->bits_per_word : spi->bits_per_word; - hz = t ? t->speed_hz : spi->max_speed_hz; + bpw = spi->bits_per_word; + hz = spi->max_speed_hz; + if (t) { + if (t->bits_per_word) + bpw = t->bits_per_word; + if (t->speed_hz) + hz = t->speed_hz; + } if (bpw < 4 || bpw > 24) { dev_err(&spi->dev, "setupxfer: invalid bits_per_word=%d\n", -- cgit v1.2.3 From 41df70d9ac2d0d36b23a0ec4866f67e540f366ff Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Mon, 7 Dec 2009 14:28:43 +0000 Subject: spi: fix spidev compilation failure when VERBOSE is defined When VERBOSE is defined in the spidev module, the compilation will throw an error on 'spi' not being defined: CC [M] drivers/spi/spidev.o drivers/spi/spidev.c: In function 'spidev_message': drivers/spi/spidev.c:266: error: 'spi' undeclared (first use in this function) drivers/spi/spidev.c:266: error: (Each undeclared identifier is reported only once drivers/spi/spidev.c:266: error: for each function it appears in.) instead of using spi-> we should actually use spidev->spi. This patch fixes the build failure. Signed-off-by: Florian Fainelli Signed-off-by: Grant Likely --- drivers/spi/spidev.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c index 5d23983f02fc..f8279e783617 100644 --- a/drivers/spi/spidev.c +++ b/drivers/spi/spidev.c @@ -267,15 +267,15 @@ static int spidev_message(struct spidev_data *spidev, k_tmp->delay_usecs = u_tmp->delay_usecs; k_tmp->speed_hz = u_tmp->speed_hz; #ifdef VERBOSE - dev_dbg(&spi->dev, + dev_dbg(&spidev->spi->dev, " xfer len %zd %s%s%s%dbits %u usec %uHz\n", u_tmp->len, u_tmp->rx_buf ? "rx " : "", u_tmp->tx_buf ? "tx " : "", u_tmp->cs_change ? "cs " : "", - u_tmp->bits_per_word ? : spi->bits_per_word, + u_tmp->bits_per_word ? : spidev->spi->bits_per_word, u_tmp->delay_usecs, - u_tmp->speed_hz ? : spi->max_speed_hz); + u_tmp->speed_hz ? : spidev->spi->max_speed_hz); #endif spi_message_add_tail(k_tmp, &msg); } -- cgit v1.2.3 From 8051effcbced8478119167b93b0e9554cb82d28e Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Thu, 26 Nov 2009 11:10:05 +0000 Subject: spi: SuperH MSIOF SPI Master driver V2 This patch is V2 of SPI Master support for the SuperH MSIOF. Full duplex, spi mode 0-3, active high cs, 3-wire and lsb first should all be supported, but the driver has so far only been tested with "mmc_spi". The MSIOF hardware comes with 32-bit FIFOs for receive and transmit, and this driver simply breaks the SPI messages into FIFO-sized chunks. The MSIOF hardware manages the pins for clock, receive and transmit (sck/miso/mosi), but the chip select pin is managed by software and must be configured as a regular GPIO pin by the board code. Performance wise there is still room for improvement, but on a Ecovec board with the built-in sh7724 MSIOF0 this driver gets Mini-sd read speeds of about half a megabyte per second. Future work include better clock setup and merging of 8-bit transfers into 32-bit words to reduce interrupt load and improve throughput. Signed-off-by: Magnus Damm Signed-off-by: Grant Likely --- drivers/spi/Kconfig | 7 + drivers/spi/Makefile | 1 + drivers/spi/spi_sh_msiof.c | 691 +++++++++++++++++++++++++++++++++++++++++++ include/linux/spi/sh_msiof.h | 10 + 4 files changed, 709 insertions(+) create mode 100644 drivers/spi/spi_sh_msiof.c create mode 100644 include/linux/spi/sh_msiof.h (limited to 'drivers/spi') diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index c00f9e5b9df8..06e1c0c9d35e 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -223,6 +223,13 @@ config SPI_S3C24XX_GPIO the inbuilt hardware cannot provide the transfer mode, or where the board is using non hardware connected pins. +config SPI_SH_MSIOF + tristate "SuperH MSIOF SPI controller" + depends on SUPERH && HAVE_CLK + select SPI_BITBANG + help + SPI driver for SuperH MSIOF blocks. + config SPI_SH_SCI tristate "SuperH SCI SPI controller" depends on SUPERH diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 2f2bebc63b64..9c51e2526892 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o obj-$(CONFIG_SPI_XILINX_OF) += xilinx_spi_of.o obj-$(CONFIG_SPI_XILINX_PLTFM) += xilinx_spi_pltfm.o obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o +obj-$(CONFIG_SPI_SH_MSIOF) += spi_sh_msiof.o obj-$(CONFIG_SPI_STMP3XXX) += spi_stmp.o # ... add above this line ... diff --git a/drivers/spi/spi_sh_msiof.c b/drivers/spi/spi_sh_msiof.c new file mode 100644 index 000000000000..51e5e1dfa6e5 --- /dev/null +++ b/drivers/spi/spi_sh_msiof.c @@ -0,0 +1,691 @@ +/* + * SuperH MSIOF SPI Master Interface + * + * Copyright (c) 2009 Magnus Damm + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include + +struct sh_msiof_spi_priv { + struct spi_bitbang bitbang; /* must be first for spi_bitbang.c */ + void __iomem *mapbase; + struct clk *clk; + struct platform_device *pdev; + struct sh_msiof_spi_info *info; + struct completion done; + unsigned long flags; + int tx_fifo_size; + int rx_fifo_size; +}; + +#define TMDR1 0x00 +#define TMDR2 0x04 +#define TMDR3 0x08 +#define RMDR1 0x10 +#define RMDR2 0x14 +#define RMDR3 0x18 +#define TSCR 0x20 +#define RSCR 0x22 +#define CTR 0x28 +#define FCTR 0x30 +#define STR 0x40 +#define IER 0x44 +#define TDR1 0x48 +#define TDR2 0x4c +#define TFDR 0x50 +#define RDR1 0x58 +#define RDR2 0x5c +#define RFDR 0x60 + +#define CTR_TSCKE (1 << 15) +#define CTR_TFSE (1 << 14) +#define CTR_TXE (1 << 9) +#define CTR_RXE (1 << 8) + +#define STR_TEOF (1 << 23) +#define STR_REOF (1 << 7) + +static unsigned long sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs) +{ + switch (reg_offs) { + case TSCR: + case RSCR: + return ioread16(p->mapbase + reg_offs); + default: + return ioread32(p->mapbase + reg_offs); + } +} + +static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs, + unsigned long value) +{ + switch (reg_offs) { + case TSCR: + case RSCR: + iowrite16(value, p->mapbase + reg_offs); + break; + default: + iowrite32(value, p->mapbase + reg_offs); + break; + } +} + +static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p, + unsigned long clr, unsigned long set) +{ + unsigned long mask = clr | set; + unsigned long data; + int k; + + data = sh_msiof_read(p, CTR); + data &= ~clr; + data |= set; + sh_msiof_write(p, CTR, data); + + for (k = 100; k > 0; k--) { + if ((sh_msiof_read(p, CTR) & mask) == set) + break; + + udelay(10); + } + + return k > 0 ? 0 : -ETIMEDOUT; +} + +static irqreturn_t sh_msiof_spi_irq(int irq, void *data) +{ + struct sh_msiof_spi_priv *p = data; + + /* just disable the interrupt and wake up */ + sh_msiof_write(p, IER, 0); + complete(&p->done); + + return IRQ_HANDLED; +} + +static struct { + unsigned short div; + unsigned short scr; +} const sh_msiof_spi_clk_table[] = { + { 1, 0x0007 }, + { 2, 0x0000 }, + { 4, 0x0001 }, + { 8, 0x0002 }, + { 16, 0x0003 }, + { 32, 0x0004 }, + { 64, 0x1f00 }, + { 128, 0x1f01 }, + { 256, 0x1f02 }, + { 512, 0x1f03 }, + { 1024, 0x1f04 }, +}; + +static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p, + unsigned long parent_rate, + unsigned long spi_hz) +{ + unsigned long div = 1024; + size_t k; + + if (!WARN_ON(!spi_hz || !parent_rate)) + div = parent_rate / spi_hz; + + /* TODO: make more fine grained */ + + for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_clk_table); k++) { + if (sh_msiof_spi_clk_table[k].div >= div) + break; + } + + k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_clk_table) - 1); + + sh_msiof_write(p, TSCR, sh_msiof_spi_clk_table[k].scr); + sh_msiof_write(p, RSCR, sh_msiof_spi_clk_table[k].scr); +} + +static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p, + int cpol, int cpha, + int tx_hi_z, int lsb_first) +{ + unsigned long tmp; + int edge; + + /* + * CPOL CPHA TSCKIZ RSCKIZ TEDG REDG(!) + * 0 0 10 10 1 0 + * 0 1 10 10 0 1 + * 1 0 11 11 0 1 + * 1 1 11 11 1 0 + * + * (!) Note: REDG is inverted recommended data sheet setting + */ + + sh_msiof_write(p, FCTR, 0); + sh_msiof_write(p, TMDR1, 0xe2000005 | (lsb_first << 24)); + sh_msiof_write(p, RMDR1, 0x22000005 | (lsb_first << 24)); + + tmp = 0xa0000000; + tmp |= cpol << 30; /* TSCKIZ */ + tmp |= cpol << 28; /* RSCKIZ */ + + edge = cpol ? cpha : !cpha; + + tmp |= edge << 27; /* TEDG */ + tmp |= !edge << 26; /* REDG */ + tmp |= (tx_hi_z ? 2 : 0) << 22; /* TXDIZ */ + sh_msiof_write(p, CTR, tmp); +} + +static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p, + const void *tx_buf, void *rx_buf, + int bits, int words) +{ + unsigned long dr2; + + dr2 = ((bits - 1) << 24) | ((words - 1) << 16); + + if (tx_buf) + sh_msiof_write(p, TMDR2, dr2); + else + sh_msiof_write(p, TMDR2, dr2 | 1); + + if (rx_buf) + sh_msiof_write(p, RMDR2, dr2); + + sh_msiof_write(p, IER, STR_TEOF | STR_REOF); +} + +static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p) +{ + sh_msiof_write(p, STR, sh_msiof_read(p, STR)); +} + +static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const unsigned char *buf_8 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, TFDR, buf_8[k] << fs); +} + +static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const unsigned short *buf_16 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, TFDR, buf_16[k] << fs); +} + +static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const unsigned short *buf_16 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, TFDR, get_unaligned(&buf_16[k]) << fs); +} + +static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const unsigned int *buf_32 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, TFDR, buf_32[k] << fs); +} + +static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p, + const void *tx_buf, int words, int fs) +{ + const unsigned int *buf_32 = tx_buf; + int k; + + for (k = 0; k < words; k++) + sh_msiof_write(p, TFDR, get_unaligned(&buf_32[k]) << fs); +} + +static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + unsigned char *buf_8 = rx_buf; + int k; + + for (k = 0; k < words; k++) + buf_8[k] = sh_msiof_read(p, RFDR) >> fs; +} + +static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + unsigned short *buf_16 = rx_buf; + int k; + + for (k = 0; k < words; k++) + buf_16[k] = sh_msiof_read(p, RFDR) >> fs; +} + +static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + unsigned short *buf_16 = rx_buf; + int k; + + for (k = 0; k < words; k++) + put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_16[k]); +} + +static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + unsigned int *buf_32 = rx_buf; + int k; + + for (k = 0; k < words; k++) + buf_32[k] = sh_msiof_read(p, RFDR) >> fs; +} + +static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p, + void *rx_buf, int words, int fs) +{ + unsigned int *buf_32 = rx_buf; + int k; + + for (k = 0; k < words; k++) + put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_32[k]); +} + +static int sh_msiof_spi_bits(struct spi_device *spi, struct spi_transfer *t) +{ + int bits; + + bits = t ? t->bits_per_word : 0; + bits = bits ? bits : spi->bits_per_word; + return bits; +} + +static unsigned long sh_msiof_spi_hz(struct spi_device *spi, + struct spi_transfer *t) +{ + unsigned long hz; + + hz = t ? t->speed_hz : 0; + hz = hz ? hz : spi->max_speed_hz; + return hz; +} + +static int sh_msiof_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + int bits; + + /* noting to check hz values against since parent clock is disabled */ + + bits = sh_msiof_spi_bits(spi, t); + if (bits < 8) + return -EINVAL; + if (bits > 32) + return -EINVAL; + + return spi_bitbang_setup_transfer(spi, t); +} + +static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on) +{ + struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master); + int value; + + /* chip select is active low unless SPI_CS_HIGH is set */ + if (spi->mode & SPI_CS_HIGH) + value = (is_on == BITBANG_CS_ACTIVE) ? 1 : 0; + else + value = (is_on == BITBANG_CS_ACTIVE) ? 0 : 1; + + if (is_on == BITBANG_CS_ACTIVE) { + if (!test_and_set_bit(0, &p->flags)) { + pm_runtime_get_sync(&p->pdev->dev); + clk_enable(p->clk); + } + + /* Configure pins before asserting CS */ + sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL), + !!(spi->mode & SPI_CPHA), + !!(spi->mode & SPI_3WIRE), + !!(spi->mode & SPI_LSB_FIRST)); + } + + /* use spi->controller data for CS (same strategy as spi_gpio) */ + gpio_set_value((unsigned)spi->controller_data, value); + + if (is_on == BITBANG_CS_INACTIVE) { + if (test_and_clear_bit(0, &p->flags)) { + clk_disable(p->clk); + pm_runtime_put(&p->pdev->dev); + } + } +} + +static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p, + void (*tx_fifo)(struct sh_msiof_spi_priv *, + const void *, int, int), + void (*rx_fifo)(struct sh_msiof_spi_priv *, + void *, int, int), + const void *tx_buf, void *rx_buf, + int words, int bits) +{ + int fifo_shift; + int ret; + + /* limit maximum word transfer to rx/tx fifo size */ + if (tx_buf) + words = min_t(int, words, p->tx_fifo_size); + if (rx_buf) + words = min_t(int, words, p->rx_fifo_size); + + /* the fifo contents need shifting */ + fifo_shift = 32 - bits; + + /* setup msiof transfer mode registers */ + sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words); + + /* write tx fifo */ + if (tx_buf) + tx_fifo(p, tx_buf, words, fifo_shift); + + /* setup clock and rx/tx signals */ + ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE); + if (rx_buf) + ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_RXE); + ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TXE); + + /* start by setting frame bit */ + INIT_COMPLETION(p->done); + ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE); + if (ret) { + dev_err(&p->pdev->dev, "failed to start hardware\n"); + goto err; + } + + /* wait for tx fifo to be emptied / rx fifo to be filled */ + wait_for_completion(&p->done); + + /* read rx fifo */ + if (rx_buf) + rx_fifo(p, rx_buf, words, fifo_shift); + + /* clear status bits */ + sh_msiof_reset_str(p); + + /* shut down frame, tx/tx and clock signals */ + ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0); + ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TXE, 0); + if (rx_buf) + ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_RXE, 0); + ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0); + if (ret) { + dev_err(&p->pdev->dev, "failed to shut down hardware\n"); + goto err; + } + + return words; + + err: + sh_msiof_write(p, IER, 0); + return ret; +} + +static int sh_msiof_spi_txrx(struct spi_device *spi, struct spi_transfer *t) +{ + struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master); + void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int); + void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int); + int bits; + int bytes_per_word; + int bytes_done; + int words; + int n; + + bits = sh_msiof_spi_bits(spi, t); + + /* setup bytes per word and fifo read/write functions */ + if (bits <= 8) { + bytes_per_word = 1; + tx_fifo = sh_msiof_spi_write_fifo_8; + rx_fifo = sh_msiof_spi_read_fifo_8; + } else if (bits <= 16) { + bytes_per_word = 2; + if ((unsigned long)t->tx_buf & 0x01) + tx_fifo = sh_msiof_spi_write_fifo_16u; + else + tx_fifo = sh_msiof_spi_write_fifo_16; + + if ((unsigned long)t->rx_buf & 0x01) + rx_fifo = sh_msiof_spi_read_fifo_16u; + else + rx_fifo = sh_msiof_spi_read_fifo_16; + } else { + bytes_per_word = 4; + if ((unsigned long)t->tx_buf & 0x03) + tx_fifo = sh_msiof_spi_write_fifo_32u; + else + tx_fifo = sh_msiof_spi_write_fifo_32; + + if ((unsigned long)t->rx_buf & 0x03) + rx_fifo = sh_msiof_spi_read_fifo_32u; + else + rx_fifo = sh_msiof_spi_read_fifo_32; + } + + /* setup clocks (clock already enabled in chipselect()) */ + sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk), + sh_msiof_spi_hz(spi, t)); + + /* transfer in fifo sized chunks */ + words = t->len / bytes_per_word; + bytes_done = 0; + + while (bytes_done < t->len) { + n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo, + t->tx_buf + bytes_done, + t->rx_buf + bytes_done, + words, bits); + if (n < 0) + break; + + bytes_done += n * bytes_per_word; + words -= n; + } + + return bytes_done; +} + +static u32 sh_msiof_spi_txrx_word(struct spi_device *spi, unsigned nsecs, + u32 word, u8 bits) +{ + BUG(); /* unused but needed by bitbang code */ + return 0; +} + +static int sh_msiof_spi_probe(struct platform_device *pdev) +{ + struct resource *r; + struct spi_master *master; + struct sh_msiof_spi_priv *p; + char clk_name[16]; + int i; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(struct sh_msiof_spi_priv)); + if (master == NULL) { + dev_err(&pdev->dev, "failed to allocate spi master\n"); + ret = -ENOMEM; + goto err0; + } + + p = spi_master_get_devdata(master); + + platform_set_drvdata(pdev, p); + p->info = pdev->dev.platform_data; + init_completion(&p->done); + + snprintf(clk_name, sizeof(clk_name), "msiof%d", pdev->id); + p->clk = clk_get(&pdev->dev, clk_name); + if (IS_ERR(p->clk)) { + dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name); + ret = PTR_ERR(p->clk); + goto err1; + } + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + i = platform_get_irq(pdev, 0); + if (!r || i < 0) { + dev_err(&pdev->dev, "cannot get platform resources\n"); + ret = -ENOENT; + goto err2; + } + p->mapbase = ioremap_nocache(r->start, resource_size(r)); + if (!p->mapbase) { + dev_err(&pdev->dev, "unable to ioremap\n"); + ret = -ENXIO; + goto err2; + } + + ret = request_irq(i, sh_msiof_spi_irq, IRQF_DISABLED, + dev_name(&pdev->dev), p); + if (ret) { + dev_err(&pdev->dev, "unable to request irq\n"); + goto err3; + } + + p->pdev = pdev; + pm_runtime_enable(&pdev->dev); + + /* The standard version of MSIOF use 64 word FIFOs */ + p->tx_fifo_size = 64; + p->rx_fifo_size = 64; + + /* Platform data may override FIFO sizes */ + if (p->info->tx_fifo_override) + p->tx_fifo_size = p->info->tx_fifo_override; + if (p->info->rx_fifo_override) + p->rx_fifo_size = p->info->rx_fifo_override; + + /* init master and bitbang code */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE; + master->flags = 0; + master->bus_num = pdev->id; + master->num_chipselect = p->info->num_chipselect; + master->setup = spi_bitbang_setup; + master->cleanup = spi_bitbang_cleanup; + + p->bitbang.master = master; + p->bitbang.chipselect = sh_msiof_spi_chipselect; + p->bitbang.setup_transfer = sh_msiof_spi_setup_transfer; + p->bitbang.txrx_bufs = sh_msiof_spi_txrx; + p->bitbang.txrx_word[SPI_MODE_0] = sh_msiof_spi_txrx_word; + p->bitbang.txrx_word[SPI_MODE_1] = sh_msiof_spi_txrx_word; + p->bitbang.txrx_word[SPI_MODE_2] = sh_msiof_spi_txrx_word; + p->bitbang.txrx_word[SPI_MODE_3] = sh_msiof_spi_txrx_word; + + ret = spi_bitbang_start(&p->bitbang); + if (ret == 0) + return 0; + + pm_runtime_disable(&pdev->dev); + err3: + iounmap(p->mapbase); + err2: + clk_put(p->clk); + err1: + spi_master_put(master); + err0: + return ret; +} + +static int sh_msiof_spi_remove(struct platform_device *pdev) +{ + struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev); + int ret; + + ret = spi_bitbang_stop(&p->bitbang); + if (!ret) { + pm_runtime_disable(&pdev->dev); + free_irq(platform_get_irq(pdev, 0), sh_msiof_spi_irq); + iounmap(p->mapbase); + clk_put(p->clk); + spi_master_put(p->bitbang.master); + } + return ret; +} + +static int sh_msiof_spi_runtime_nop(struct device *dev) +{ + /* Runtime PM callback shared between ->runtime_suspend() + * and ->runtime_resume(). Simply returns success. + * + * This driver re-initializes all registers after + * pm_runtime_get_sync() anyway so there is no need + * to save and restore registers here. + */ + return 0; +} + +static struct dev_pm_ops sh_msiof_spi_dev_pm_ops = { + .runtime_suspend = sh_msiof_spi_runtime_nop, + .runtime_resume = sh_msiof_spi_runtime_nop, +}; + +static struct platform_driver sh_msiof_spi_drv = { + .probe = sh_msiof_spi_probe, + .remove = sh_msiof_spi_remove, + .driver = { + .name = "spi_sh_msiof", + .owner = THIS_MODULE, + .pm = &sh_msiof_spi_dev_pm_ops, + }, +}; + +static int __init sh_msiof_spi_init(void) +{ + return platform_driver_register(&sh_msiof_spi_drv); +} +module_init(sh_msiof_spi_init); + +static void __exit sh_msiof_spi_exit(void) +{ + platform_driver_unregister(&sh_msiof_spi_drv); +} +module_exit(sh_msiof_spi_exit); + +MODULE_DESCRIPTION("SuperH MSIOF SPI Master Interface Driver"); +MODULE_AUTHOR("Magnus Damm"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:spi_sh_msiof"); diff --git a/include/linux/spi/sh_msiof.h b/include/linux/spi/sh_msiof.h new file mode 100644 index 000000000000..2e8db3d2d2e5 --- /dev/null +++ b/include/linux/spi/sh_msiof.h @@ -0,0 +1,10 @@ +#ifndef __SPI_SH_MSIOF_H__ +#define __SPI_SH_MSIOF_H__ + +struct sh_msiof_spi_info { + int tx_fifo_override; + int rx_fifo_override; + u16 num_chipselect; +}; + +#endif /* __SPI_SH_MSIOF_H__ */ -- cgit v1.2.3 From 30eaed053c9bced7a23624e4bab5602e5b85124f Mon Sep 17 00:00:00 2001 From: Wan ZongShun Date: Tue, 1 Dec 2009 14:29:20 +0000 Subject: ARM: NUC900: Add spi driver support for nuc900 Signed-off-by: Wan ZongShun Signed-off-by: Grant Likely --- arch/arm/mach-w90x900/include/mach/nuc900_spi.h | 35 ++ drivers/spi/Kconfig | 7 + drivers/spi/Makefile | 1 + drivers/spi/spi_nuc900.c | 504 ++++++++++++++++++++++++ 4 files changed, 547 insertions(+) create mode 100644 arch/arm/mach-w90x900/include/mach/nuc900_spi.h create mode 100644 drivers/spi/spi_nuc900.c (limited to 'drivers/spi') diff --git a/arch/arm/mach-w90x900/include/mach/nuc900_spi.h b/arch/arm/mach-w90x900/include/mach/nuc900_spi.h new file mode 100644 index 000000000000..bd94819e314f --- /dev/null +++ b/arch/arm/mach-w90x900/include/mach/nuc900_spi.h @@ -0,0 +1,35 @@ +/* + * arch/arm/mach-w90x900/include/mach/nuc900_spi.h + * + * Copyright (c) 2009 Nuvoton technology corporation. + * + * Wan ZongShun + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation;version 2 of the License. + * + */ + +#ifndef __ASM_ARCH_SPI_H +#define __ASM_ARCH_SPI_H + +extern void mfp_set_groupg(struct device *dev); + +struct nuc900_spi_info { + unsigned int num_cs; + unsigned int lsb; + unsigned int txneg; + unsigned int rxneg; + unsigned int divider; + unsigned int sleep; + unsigned int txnum; + unsigned int txbitlen; + int bus_num; +}; + +struct nuc900_spi_chip { + unsigned char bits_per_word; +}; + +#endif /* __ASM_ARCH_SPI_H */ diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 06e1c0c9d35e..b9908e9a9954 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -275,6 +275,13 @@ config SPI_XILINX_PLTFM This is the platform driver for the SPI controller IP from the Xilinx EDK. +config SPI_NUC900 + tristate "Nuvoton NUC900 series SPI" + depends on ARCH_W90X900 && EXPERIMENTAL + select SPI_BITBANG + help + SPI driver for Nuvoton NUC900 series ARM SoCs + # # Add new SPI master controllers in alphabetical order above this line # diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 9c51e2526892..be6e8a50468e 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_SPI_XILINX_PLTFM) += xilinx_spi_pltfm.o obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o obj-$(CONFIG_SPI_SH_MSIOF) += spi_sh_msiof.o obj-$(CONFIG_SPI_STMP3XXX) += spi_stmp.o +obj-$(CONFIG_SPI_NUC900) += spi_nuc900.o # ... add above this line ... # SPI protocol drivers (device/link on bus) diff --git a/drivers/spi/spi_nuc900.c b/drivers/spi/spi_nuc900.c new file mode 100644 index 000000000000..b319f9bf9b9b --- /dev/null +++ b/drivers/spi/spi_nuc900.c @@ -0,0 +1,504 @@ +/* linux/drivers/spi/spi_nuc900.c + * + * Copyright (c) 2009 Nuvoton technology. + * Wan ZongShun + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * +*/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include + +/* usi registers offset */ +#define USI_CNT 0x00 +#define USI_DIV 0x04 +#define USI_SSR 0x08 +#define USI_RX0 0x10 +#define USI_TX0 0x10 + +/* usi register bit */ +#define ENINT (0x01 << 17) +#define ENFLG (0x01 << 16) +#define TXNUM (0x03 << 8) +#define TXNEG (0x01 << 2) +#define RXNEG (0x01 << 1) +#define LSB (0x01 << 10) +#define SELECTLEV (0x01 << 2) +#define SELECTPOL (0x01 << 31) +#define SELECTSLAVE 0x01 +#define GOBUSY 0x01 + +struct nuc900_spi { + struct spi_bitbang bitbang; + struct completion done; + void __iomem *regs; + int irq; + int len; + int count; + const unsigned char *tx; + unsigned char *rx; + struct clk *clk; + struct resource *ioarea; + struct spi_master *master; + struct spi_device *curdev; + struct device *dev; + struct nuc900_spi_info *pdata; + spinlock_t lock; + struct resource *res; +}; + +static inline struct nuc900_spi *to_hw(struct spi_device *sdev) +{ + return spi_master_get_devdata(sdev->master); +} + +static void nuc900_slave_select(struct spi_device *spi, unsigned int ssr) +{ + struct nuc900_spi *hw = to_hw(spi); + unsigned int val; + unsigned int cs = spi->mode & SPI_CS_HIGH ? 1 : 0; + unsigned int cpol = spi->mode & SPI_CPOL ? 1 : 0; + unsigned long flags; + + spin_lock_irqsave(&hw->lock, flags); + + val = __raw_readl(hw->regs + USI_SSR); + + if (!cs) + val &= ~SELECTLEV; + else + val |= SELECTLEV; + + if (!ssr) + val &= ~SELECTSLAVE; + else + val |= SELECTSLAVE; + + __raw_writel(val, hw->regs + USI_SSR); + + val = __raw_readl(hw->regs + USI_CNT); + + if (!cpol) + val &= ~SELECTPOL; + else + val |= SELECTPOL; + + __raw_writel(val, hw->regs + USI_CNT); + + spin_unlock_irqrestore(&hw->lock, flags); +} + +static void nuc900_spi_chipsel(struct spi_device *spi, int value) +{ + switch (value) { + case BITBANG_CS_INACTIVE: + nuc900_slave_select(spi, 0); + break; + + case BITBANG_CS_ACTIVE: + nuc900_slave_select(spi, 1); + break; + } +} + +static void nuc900_spi_setup_txnum(struct nuc900_spi *hw, + unsigned int txnum) +{ + unsigned int val; + unsigned long flags; + + spin_lock_irqsave(&hw->lock, flags); + + val = __raw_readl(hw->regs + USI_CNT); + + if (!txnum) + val &= ~TXNUM; + else + val |= txnum << 0x08; + + __raw_writel(val, hw->regs + USI_CNT); + + spin_unlock_irqrestore(&hw->lock, flags); + +} + +static void nuc900_spi_setup_txbitlen(struct nuc900_spi *hw, + unsigned int txbitlen) +{ + unsigned int val; + unsigned long flags; + + spin_lock_irqsave(&hw->lock, flags); + + val = __raw_readl(hw->regs + USI_CNT); + + val |= (txbitlen << 0x03); + + __raw_writel(val, hw->regs + USI_CNT); + + spin_unlock_irqrestore(&hw->lock, flags); +} + +static void nuc900_spi_gobusy(struct nuc900_spi *hw) +{ + unsigned int val; + unsigned long flags; + + spin_lock_irqsave(&hw->lock, flags); + + val = __raw_readl(hw->regs + USI_CNT); + + val |= GOBUSY; + + __raw_writel(val, hw->regs + USI_CNT); + + spin_unlock_irqrestore(&hw->lock, flags); +} + +static int nuc900_spi_setupxfer(struct spi_device *spi, + struct spi_transfer *t) +{ + return 0; +} + +static int nuc900_spi_setup(struct spi_device *spi) +{ + return 0; +} + +static inline unsigned int hw_txbyte(struct nuc900_spi *hw, int count) +{ + return hw->tx ? hw->tx[count] : 0; +} + +static int nuc900_spi_txrx(struct spi_device *spi, struct spi_transfer *t) +{ + struct nuc900_spi *hw = to_hw(spi); + + hw->tx = t->tx_buf; + hw->rx = t->rx_buf; + hw->len = t->len; + hw->count = 0; + + __raw_writel(hw_txbyte(hw, 0x0), hw->regs + USI_TX0); + + nuc900_spi_gobusy(hw); + + wait_for_completion(&hw->done); + + return hw->count; +} + +static irqreturn_t nuc900_spi_irq(int irq, void *dev) +{ + struct nuc900_spi *hw = dev; + unsigned int status; + unsigned int count = hw->count; + + status = __raw_readl(hw->regs + USI_CNT); + __raw_writel(status, hw->regs + USI_CNT); + + if (status & ENFLG) { + hw->count++; + + if (hw->rx) + hw->rx[count] = __raw_readl(hw->regs + USI_RX0); + count++; + + if (count < hw->len) { + __raw_writel(hw_txbyte(hw, count), hw->regs + USI_TX0); + nuc900_spi_gobusy(hw); + } else { + complete(&hw->done); + } + + return IRQ_HANDLED; + } + + complete(&hw->done); + return IRQ_HANDLED; +} + +static void nuc900_tx_edge(struct nuc900_spi *hw, unsigned int edge) +{ + unsigned int val; + unsigned long flags; + + spin_lock_irqsave(&hw->lock, flags); + + val = __raw_readl(hw->regs + USI_CNT); + + if (edge) + val |= TXNEG; + else + val &= ~TXNEG; + __raw_writel(val, hw->regs + USI_CNT); + + spin_unlock_irqrestore(&hw->lock, flags); +} + +static void nuc900_rx_edge(struct nuc900_spi *hw, unsigned int edge) +{ + unsigned int val; + unsigned long flags; + + spin_lock_irqsave(&hw->lock, flags); + + val = __raw_readl(hw->regs + USI_CNT); + + if (edge) + val |= RXNEG; + else + val &= ~RXNEG; + __raw_writel(val, hw->regs + USI_CNT); + + spin_unlock_irqrestore(&hw->lock, flags); +} + +static void nuc900_send_first(struct nuc900_spi *hw, unsigned int lsb) +{ + unsigned int val; + unsigned long flags; + + spin_lock_irqsave(&hw->lock, flags); + + val = __raw_readl(hw->regs + USI_CNT); + + if (lsb) + val |= LSB; + else + val &= ~LSB; + __raw_writel(val, hw->regs + USI_CNT); + + spin_unlock_irqrestore(&hw->lock, flags); +} + +static void nuc900_set_sleep(struct nuc900_spi *hw, unsigned int sleep) +{ + unsigned int val; + unsigned long flags; + + spin_lock_irqsave(&hw->lock, flags); + + val = __raw_readl(hw->regs + USI_CNT); + + if (sleep) + val |= (sleep << 12); + else + val &= ~(0x0f << 12); + __raw_writel(val, hw->regs + USI_CNT); + + spin_unlock_irqrestore(&hw->lock, flags); +} + +static void nuc900_enable_int(struct nuc900_spi *hw) +{ + unsigned int val; + unsigned long flags; + + spin_lock_irqsave(&hw->lock, flags); + + val = __raw_readl(hw->regs + USI_CNT); + + val |= ENINT; + + __raw_writel(val, hw->regs + USI_CNT); + + spin_unlock_irqrestore(&hw->lock, flags); +} + +static void nuc900_set_divider(struct nuc900_spi *hw) +{ + __raw_writel(hw->pdata->divider, hw->regs + USI_DIV); +} + +static void nuc900_init_spi(struct nuc900_spi *hw) +{ + clk_enable(hw->clk); + spin_lock_init(&hw->lock); + + nuc900_tx_edge(hw, hw->pdata->txneg); + nuc900_rx_edge(hw, hw->pdata->rxneg); + nuc900_send_first(hw, hw->pdata->lsb); + nuc900_set_sleep(hw, hw->pdata->sleep); + nuc900_spi_setup_txbitlen(hw, hw->pdata->txbitlen); + nuc900_spi_setup_txnum(hw, hw->pdata->txnum); + nuc900_set_divider(hw); + nuc900_enable_int(hw); +} + +static int __devinit nuc900_spi_probe(struct platform_device *pdev) +{ + struct nuc900_spi *hw; + struct spi_master *master; + int err = 0; + + master = spi_alloc_master(&pdev->dev, sizeof(struct nuc900_spi)); + if (master == NULL) { + dev_err(&pdev->dev, "No memory for spi_master\n"); + err = -ENOMEM; + goto err_nomem; + } + + hw = spi_master_get_devdata(master); + memset(hw, 0, sizeof(struct nuc900_spi)); + + hw->master = spi_master_get(master); + hw->pdata = pdev->dev.platform_data; + hw->dev = &pdev->dev; + + if (hw->pdata == NULL) { + dev_err(&pdev->dev, "No platform data supplied\n"); + err = -ENOENT; + goto err_pdata; + } + + platform_set_drvdata(pdev, hw); + init_completion(&hw->done); + + master->mode_bits = SPI_MODE_0; + master->num_chipselect = hw->pdata->num_cs; + master->bus_num = hw->pdata->bus_num; + hw->bitbang.master = hw->master; + hw->bitbang.setup_transfer = nuc900_spi_setupxfer; + hw->bitbang.chipselect = nuc900_spi_chipsel; + hw->bitbang.txrx_bufs = nuc900_spi_txrx; + hw->bitbang.master->setup = nuc900_spi_setup; + + hw->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (hw->res == NULL) { + dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n"); + err = -ENOENT; + goto err_pdata; + } + + hw->ioarea = request_mem_region(hw->res->start, + resource_size(hw->res), pdev->name); + + if (hw->ioarea == NULL) { + dev_err(&pdev->dev, "Cannot reserve region\n"); + err = -ENXIO; + goto err_pdata; + } + + hw->regs = ioremap(hw->res->start, resource_size(hw->res)); + if (hw->regs == NULL) { + dev_err(&pdev->dev, "Cannot map IO\n"); + err = -ENXIO; + goto err_iomap; + } + + hw->irq = platform_get_irq(pdev, 0); + if (hw->irq < 0) { + dev_err(&pdev->dev, "No IRQ specified\n"); + err = -ENOENT; + goto err_irq; + } + + err = request_irq(hw->irq, nuc900_spi_irq, 0, pdev->name, hw); + if (err) { + dev_err(&pdev->dev, "Cannot claim IRQ\n"); + goto err_irq; + } + + hw->clk = clk_get(&pdev->dev, "spi"); + if (IS_ERR(hw->clk)) { + dev_err(&pdev->dev, "No clock for device\n"); + err = PTR_ERR(hw->clk); + goto err_clk; + } + + mfp_set_groupg(&pdev->dev); + nuc900_init_spi(hw); + + err = spi_bitbang_start(&hw->bitbang); + if (err) { + dev_err(&pdev->dev, "Failed to register SPI master\n"); + goto err_register; + } + + return 0; + +err_register: + clk_disable(hw->clk); + clk_put(hw->clk); +err_clk: + free_irq(hw->irq, hw); +err_irq: + iounmap(hw->regs); +err_iomap: + release_mem_region(hw->res->start, resource_size(hw->res)); + kfree(hw->ioarea); +err_pdata: + spi_master_put(hw->master);; + +err_nomem: + return err; +} + +static int __devexit nuc900_spi_remove(struct platform_device *dev) +{ + struct nuc900_spi *hw = platform_get_drvdata(dev); + + free_irq(hw->irq, hw); + + platform_set_drvdata(dev, NULL); + + spi_unregister_master(hw->master); + + clk_disable(hw->clk); + clk_put(hw->clk); + + iounmap(hw->regs); + + release_mem_region(hw->res->start, resource_size(hw->res)); + kfree(hw->ioarea); + + spi_master_put(hw->master); + return 0; +} + +static struct platform_driver nuc900_spi_driver = { + .probe = nuc900_spi_probe, + .remove = __devexit_p(nuc900_spi_remove), + .driver = { + .name = "nuc900-spi", + .owner = THIS_MODULE, + }, +}; + +static int __init nuc900_spi_init(void) +{ + return platform_driver_register(&nuc900_spi_driver); +} + +static void __exit nuc900_spi_exit(void) +{ + platform_driver_unregister(&nuc900_spi_driver); +} + +module_init(nuc900_spi_init); +module_exit(nuc900_spi_exit); + +MODULE_AUTHOR("Wan ZongShun "); +MODULE_DESCRIPTION("nuc900 spi driver!"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:nuc900-spi"); -- cgit v1.2.3 From 60f675a12c03c65018beaa1d1ede41557aa60e00 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Sun, 13 Dec 2009 00:58:13 -0700 Subject: spi-imx: correct check for platform_get_irq failing MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit platform_get_irq returns -ENXIO if there is no entry. So ensure return value is greater than zero instead of non-zero. Signed-off-by: Uwe Kleine-König Signed-off-by: Grant Likely --- drivers/spi/spi_imx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index 8ffa48ce570c..c96804f62052 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -555,7 +555,7 @@ static int __init spi_imx_probe(struct platform_device *pdev) } spi_imx->irq = platform_get_irq(pdev, 0); - if (!spi_imx->irq) { + if (spi_imx->irq <= 0) { ret = -EINVAL; goto out_iounmap; } -- cgit v1.2.3 From f30d59c5d34478fe5e07fd9c9e4bda6329684509 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Sun, 13 Dec 2009 00:58:29 -0700 Subject: spi-imx: use positive logic to distinguish cpu variants MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This is much safer when support for new variants is added. Signed-off-by: Uwe Kleine-König Signed-off-by: Grant Likely --- drivers/spi/spi_imx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index c96804f62052..496bf9ad16e0 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -594,7 +594,7 @@ static int __init spi_imx_probe(struct platform_device *pdev) clk_enable(spi_imx->clk); spi_imx->spi_clk = clk_get_rate(spi_imx->clk); - if (!cpu_is_mx31() || !cpu_is_mx35()) + if (cpu_is_mx1() || cpu_is_mx21() || cpu_is_mx27()) writel(1, spi_imx->base + MXC_RESET); /* drain receive buffer */ -- cgit v1.2.3 From 87f673e9ca468b98da5677cf43abdd09945f449d Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Sun, 13 Dec 2009 00:58:41 -0700 Subject: spi-imx: Add mx25 support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Sascha Hauer Signed-off-by: Uwe Kleine-König Signed-off-by: Grant Likely --- drivers/spi/spi_imx.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index 496bf9ad16e0..4c9b1332b536 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -208,7 +208,7 @@ static int mx31_config(struct spi_imx_data *spi_imx, if (cpu_is_mx31()) reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT; - else if (cpu_is_mx35()) { + else if (cpu_is_mx25() || cpu_is_mx35()) { reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT; reg |= MX31_CSPICTRL_SSCTL; } @@ -222,7 +222,7 @@ static int mx31_config(struct spi_imx_data *spi_imx, if (config->cs < 0) { if (cpu_is_mx31()) reg |= (config->cs + 32) << MX31_CSPICTRL_CS_SHIFT; - else if (cpu_is_mx35()) + else if (cpu_is_mx25() || cpu_is_mx35()) reg |= (config->cs + 32) << MX35_CSPICTRL_CS_SHIFT; } @@ -566,7 +566,7 @@ static int __init spi_imx_probe(struct platform_device *pdev) goto out_iounmap; } - if (cpu_is_mx31() || cpu_is_mx35()) { + if (cpu_is_mx25() || cpu_is_mx31() || cpu_is_mx35()) { spi_imx->intctrl = mx31_intctrl; spi_imx->config = mx31_config; spi_imx->trigger = mx31_trigger; @@ -598,7 +598,7 @@ static int __init spi_imx_probe(struct platform_device *pdev) writel(1, spi_imx->base + MXC_RESET); /* drain receive buffer */ - if (cpu_is_mx31() || cpu_is_mx35()) + if (cpu_is_mx25() || cpu_is_mx31() || cpu_is_mx35()) while (readl(spi_imx->base + MX3_CSPISTAT) & MX3_CSPISTAT_RR) readl(spi_imx->base + MXC_CSPIRXDATA); -- cgit v1.2.3 From 980f3beeb68fd3b383908bac8a017b121df8ee29 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Sun, 13 Dec 2009 01:02:09 -0700 Subject: spi-imx: don't access struct device directly but use dev_get_platdata MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Also there is no casting needed to assign a void pointer. Signed-off-by: Uwe Kleine-König Signed-off-by: Grant Likely --- drivers/spi/spi_imx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index 4c9b1332b536..e334747ba2d9 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -492,7 +492,7 @@ static int __init spi_imx_probe(struct platform_device *pdev) struct resource *res; int i, ret; - mxc_platform_info = (struct spi_imx_master *)pdev->dev.platform_data; + mxc_platform_info = dev_get_platdata(&pdev->dev); if (!mxc_platform_info) { dev_err(&pdev->dev, "can't get the platform data\n"); return -EINVAL; -- cgit v1.2.3 From 35c9049b27040d09461bc90928ad770be7ddf661 Mon Sep 17 00:00:00 2001 From: Cory Maccarrone Date: Sun, 13 Dec 2009 01:02:11 -0700 Subject: Add OMAP spi100k driver This change adds the OMAP SPI 100k driver created by Fabrice Crohas . This SPI bus is found on OMAP7xx-series smartphones, and for many, the touchscreen is attached to this bus. The lion's share of the work was done by Fabrice on this driver -- I am merely porting it from the Linwizard project on his behalf. Signed-off-by: Cory Maccarrone Signed-off-by: Grant Likely --- drivers/spi/Kconfig | 6 + drivers/spi/Makefile | 1 + drivers/spi/omap_spi_100k.c | 635 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 642 insertions(+) create mode 100644 drivers/spi/omap_spi_100k.c (limited to 'drivers/spi') diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index b9908e9a9954..07e5453f7b18 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -172,6 +172,12 @@ config SPI_OMAP24XX SPI master controller for OMAP24xx/OMAP34xx Multichannel SPI (McSPI) modules. +config SPI_OMAP_100K + tristate "OMAP SPI 100K" + depends on SPI_MASTER && (ARCH_OMAP850 || ARCH_OMAP730) + help + OMAP SPI 100K master controller for omap7xx boards. + config SPI_ORION tristate "Orion SPI master (EXPERIMENTAL)" depends on PLAT_ORION && EXPERIMENTAL diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index be6e8a50468e..ed8c1675b52f 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o obj-$(CONFIG_SPI_PXA2XX) += pxa2xx_spi.o obj-$(CONFIG_SPI_OMAP_UWIRE) += omap_uwire.o obj-$(CONFIG_SPI_OMAP24XX) += omap2_mcspi.o +obj-$(CONFIG_SPI_OMAP_100K) += omap_spi_100k.o obj-$(CONFIG_SPI_ORION) += orion_spi.o obj-$(CONFIG_SPI_PL022) += amba-pl022.o obj-$(CONFIG_SPI_MPC52xx_PSC) += mpc52xx_psc_spi.o diff --git a/drivers/spi/omap_spi_100k.c b/drivers/spi/omap_spi_100k.c new file mode 100644 index 000000000000..5355d90d1bee --- /dev/null +++ b/drivers/spi/omap_spi_100k.c @@ -0,0 +1,635 @@ +/* + * OMAP7xx SPI 100k controller driver + * Author: Fabrice Crohas + * from original omap1_mcspi driver + * + * Copyright (C) 2005, 2006 Nokia Corporation + * Author: Samuel Ortiz and + * Juha Yrj�l� + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include + +#define OMAP1_SPI100K_MAX_FREQ 48000000 + +#define ICR_SPITAS (OMAP7XX_ICR_BASE + 0x12) + +#define SPI_SETUP1 0x00 +#define SPI_SETUP2 0x02 +#define SPI_CTRL 0x04 +#define SPI_STATUS 0x06 +#define SPI_TX_LSB 0x08 +#define SPI_TX_MSB 0x0a +#define SPI_RX_LSB 0x0c +#define SPI_RX_MSB 0x0e + +#define SPI_SETUP1_INT_READ_ENABLE (1UL << 5) +#define SPI_SETUP1_INT_WRITE_ENABLE (1UL << 4) +#define SPI_SETUP1_CLOCK_DIVISOR(x) ((x) << 1) +#define SPI_SETUP1_CLOCK_ENABLE (1UL << 0) + +#define SPI_SETUP2_ACTIVE_EDGE_FALLING (0UL << 0) +#define SPI_SETUP2_ACTIVE_EDGE_RISING (1UL << 0) +#define SPI_SETUP2_NEGATIVE_LEVEL (0UL << 5) +#define SPI_SETUP2_POSITIVE_LEVEL (1UL << 5) +#define SPI_SETUP2_LEVEL_TRIGGER (0UL << 10) +#define SPI_SETUP2_EDGE_TRIGGER (1UL << 10) + +#define SPI_CTRL_SEN(x) ((x) << 7) +#define SPI_CTRL_WORD_SIZE(x) (((x) - 1) << 2) +#define SPI_CTRL_WR (1UL << 1) +#define SPI_CTRL_RD (1UL << 0) + +#define SPI_STATUS_WE (1UL << 1) +#define SPI_STATUS_RD (1UL << 0) + +#define WRITE 0 +#define READ 1 + + +/* use PIO for small transfers, avoiding DMA setup/teardown overhead and + * cache operations; better heuristics consider wordsize and bitrate. + */ +#define DMA_MIN_BYTES 8 + +#define SPI_RUNNING 0 +#define SPI_SHUTDOWN 1 + +struct omap1_spi100k { + struct work_struct work; + + /* lock protects queue and registers */ + spinlock_t lock; + struct list_head msg_queue; + struct spi_master *master; + struct clk *ick; + struct clk *fck; + + /* Virtual base address of the controller */ + void __iomem *base; + + /* State of the SPI */ + unsigned int state; +}; + +struct omap1_spi100k_cs { + void __iomem *base; + int word_len; +}; + +static struct workqueue_struct *omap1_spi100k_wq; + +#define MOD_REG_BIT(val, mask, set) do { \ + if (set) \ + val |= mask; \ + else \ + val &= ~mask; \ +} while (0) + +static void spi100k_enable_clock(struct spi_master *master) +{ + unsigned int val; + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + /* enable SPI */ + val = readw(spi100k->base + SPI_SETUP1); + val |= SPI_SETUP1_CLOCK_ENABLE; + writew(val, spi100k->base + SPI_SETUP1); +} + +static void spi100k_disable_clock(struct spi_master *master) +{ + unsigned int val; + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + /* disable SPI */ + val = readw(spi100k->base + SPI_SETUP1); + val &= ~SPI_SETUP1_CLOCK_ENABLE; + writew(val, spi100k->base + SPI_SETUP1); +} + +static void spi100k_write_data(struct spi_master *master, int len, int data) +{ + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + /* write 16-bit word */ + spi100k_enable_clock(master); + writew( data , spi100k->base + SPI_TX_MSB); + + writew(SPI_CTRL_SEN(0) | + SPI_CTRL_WORD_SIZE(len) | + SPI_CTRL_WR, + spi100k->base + SPI_CTRL); + + /* Wait for bit ack send change */ + while((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_WE) != SPI_STATUS_WE); + udelay(1000); + + spi100k_disable_clock(master); +} + +static int spi100k_read_data(struct spi_master *master, int len) +{ + int dataH,dataL; + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + spi100k_enable_clock(master); + writew(SPI_CTRL_SEN(0) | + SPI_CTRL_WORD_SIZE(len) | + SPI_CTRL_RD, + spi100k->base + SPI_CTRL); + + while((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_RD) != SPI_STATUS_RD); + udelay(1000); + + dataL = readw(spi100k->base + SPI_RX_LSB); + dataH = readw(spi100k->base + SPI_RX_MSB); + spi100k_disable_clock(master); + + return dataL; +} + +static void spi100k_open(struct spi_master *master) +{ + /* get control of SPI */ + struct omap1_spi100k *spi100k = spi_master_get_devdata(master); + + writew(SPI_SETUP1_INT_READ_ENABLE | + SPI_SETUP1_INT_WRITE_ENABLE | + SPI_SETUP1_CLOCK_DIVISOR(0), spi100k->base + SPI_SETUP1); + + /* configure clock and interrupts */ + writew(SPI_SETUP2_ACTIVE_EDGE_FALLING | + SPI_SETUP2_NEGATIVE_LEVEL | + SPI_SETUP2_LEVEL_TRIGGER, spi100k->base + SPI_SETUP2); +} + +static void omap1_spi100k_force_cs(struct omap1_spi100k *spi100k, int enable) +{ + if (enable) + writew(0x05fc, spi100k->base + SPI_CTRL); + else + writew(0x05fd, spi100k->base + SPI_CTRL); +} + +static unsigned +omap1_spi100k_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) +{ + struct omap1_spi100k *spi100k; + struct omap1_spi100k_cs *cs = spi->controller_state; + unsigned int count, c; + int word_len; + + spi100k = spi_master_get_devdata(spi->master); + count = xfer->len; + c = count; + word_len = cs->word_len; + + /* RX_ONLY mode needs dummy data in TX reg */ + if (xfer->tx_buf == NULL) + spi100k_write_data(spi->master,word_len, 0); + + if (word_len <= 8) { + u8 *rx; + const u8 *tx; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + do { + c-=1; + if (xfer->tx_buf != NULL) + spi100k_write_data(spi->master,word_len, *tx); + if (xfer->rx_buf != NULL) + *rx = spi100k_read_data(spi->master,word_len); + } while(c); + } else if (word_len <= 16) { + u16 *rx; + const u16 *tx; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + do { + c-=2; + if (xfer->tx_buf != NULL) + spi100k_write_data(spi->master,word_len, *tx++); + if (xfer->rx_buf != NULL) + *rx++ = spi100k_read_data(spi->master,word_len); + } while(c); + } else if (word_len <= 32) { + u32 *rx; + const u32 *tx; + + rx = xfer->rx_buf; + tx = xfer->tx_buf; + do { + c-=4; + if (xfer->tx_buf != NULL) + spi100k_write_data(spi->master,word_len, *tx); + if (xfer->rx_buf != NULL) + *rx = spi100k_read_data(spi->master,word_len); + } while(c); + } + return count - c; +} + +/* called only when no transfer is active to this device */ +static int omap1_spi100k_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct omap1_spi100k *spi100k = spi_master_get_devdata(spi->master); + struct omap1_spi100k_cs *cs = spi->controller_state; + u8 word_len = spi->bits_per_word; + + if (t != NULL && t->bits_per_word) + word_len = t->bits_per_word; + if (!word_len) + word_len = 8; + + if (spi->bits_per_word > 32) + return -EINVAL; + cs->word_len = word_len; + + /* SPI init before transfer */ + writew(0x3e , spi100k->base + SPI_SETUP1); + writew(0x00 , spi100k->base + SPI_STATUS); + writew(0x3e , spi100k->base + SPI_CTRL); + + return 0; +} + +/* the spi->mode bits understood by this driver: */ +#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) + +static int omap1_spi100k_setup(struct spi_device *spi) +{ + int ret; + struct omap1_spi100k *spi100k; + struct omap1_spi100k_cs *cs = spi->controller_state; + + if (spi->bits_per_word < 4 || spi->bits_per_word > 32) { + dev_dbg(&spi->dev, "setup: unsupported %d bit words\n", + spi->bits_per_word); + return -EINVAL; + } + + spi100k = spi_master_get_devdata(spi->master); + + if (!cs) { + cs = kzalloc(sizeof *cs, GFP_KERNEL); + if (!cs) + return -ENOMEM; + cs->base = spi100k->base + spi->chip_select * 0x14; + spi->controller_state = cs; + } + + spi100k_open(spi->master); + + clk_enable(spi100k->ick); + clk_enable(spi100k->fck); + + ret = omap1_spi100k_setup_transfer(spi, NULL); + + clk_disable(spi100k->ick); + clk_disable(spi100k->fck); + + return ret; +} + +static void omap1_spi100k_work(struct work_struct *work) +{ + struct omap1_spi100k *spi100k; + int status = 0; + + spi100k = container_of(work, struct omap1_spi100k, work); + spin_lock_irq(&spi100k->lock); + + clk_enable(spi100k->ick); + clk_enable(spi100k->fck); + + /* We only enable one channel at a time -- the one whose message is + * at the head of the queue -- although this controller would gladly + * arbitrate among multiple channels. This corresponds to "single + * channel" master mode. As a side effect, we need to manage the + * chipselect with the FORCE bit ... CS != channel enable. + */ + while (!list_empty(&spi100k->msg_queue)) { + struct spi_message *m; + struct spi_device *spi; + struct spi_transfer *t = NULL; + int cs_active = 0; + struct omap1_spi100k_cs *cs; + int par_override = 0; + + m = container_of(spi100k->msg_queue.next, struct spi_message, + queue); + + list_del_init(&m->queue); + spin_unlock_irq(&spi100k->lock); + + spi = m->spi; + cs = spi->controller_state; + + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { + status = -EINVAL; + break; + } + if (par_override || t->speed_hz || t->bits_per_word) { + par_override = 1; + status = omap1_spi100k_setup_transfer(spi, t); + if (status < 0) + break; + if (!t->speed_hz && !t->bits_per_word) + par_override = 0; + } + + if (!cs_active) { + omap1_spi100k_force_cs(spi100k, 1); + cs_active = 1; + } + + if (t->len) { + unsigned count; + + /* RX_ONLY mode needs dummy data in TX reg */ + if (t->tx_buf == NULL) + spi100k_write_data(spi->master, 8, 0); + + count = omap1_spi100k_txrx_pio(spi, t); + m->actual_length += count; + + if (count != t->len) { + status = -EIO; + break; + } + } + + if (t->delay_usecs) + udelay(t->delay_usecs); + + /* ignore the "leave it on after last xfer" hint */ + + if (t->cs_change) { + omap1_spi100k_force_cs(spi100k, 0); + cs_active = 0; + } + } + + /* Restore defaults if they were overriden */ + if (par_override) { + par_override = 0; + status = omap1_spi100k_setup_transfer(spi, NULL); + } + + if (cs_active) + omap1_spi100k_force_cs(spi100k, 0); + + m->status = status; + m->complete(m->context); + + spin_lock_irq(&spi100k->lock); + } + + clk_disable(spi100k->ick); + clk_disable(spi100k->fck); + spin_unlock_irq(&spi100k->lock); + + if (status < 0) + printk(KERN_WARNING "spi transfer failed with %d\n", status); +} + +static int omap1_spi100k_transfer(struct spi_device *spi, struct spi_message *m) +{ + struct omap1_spi100k *spi100k; + unsigned long flags; + struct spi_transfer *t; + + m->actual_length = 0; + m->status = -EINPROGRESS; + + spi100k = spi_master_get_devdata(spi->master); + + /* Don't accept new work if we're shutting down */ + if (spi100k->state == SPI_SHUTDOWN) + return -ESHUTDOWN; + + /* reject invalid messages and transfers */ + if (list_empty(&m->transfers) || !m->complete) + return -EINVAL; + + list_for_each_entry(t, &m->transfers, transfer_list) { + const void *tx_buf = t->tx_buf; + void *rx_buf = t->rx_buf; + unsigned len = t->len; + + if (t->speed_hz > OMAP1_SPI100K_MAX_FREQ + || (len && !(rx_buf || tx_buf)) + || (t->bits_per_word && + ( t->bits_per_word < 4 + || t->bits_per_word > 32))) { + dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n", + t->speed_hz, + len, + tx_buf ? "tx" : "", + rx_buf ? "rx" : "", + t->bits_per_word); + return -EINVAL; + } + + if (t->speed_hz && t->speed_hz < OMAP1_SPI100K_MAX_FREQ/(1<<16)) { + dev_dbg(&spi->dev, "%d Hz max exceeds %d\n", + t->speed_hz, + OMAP1_SPI100K_MAX_FREQ/(1<<16)); + return -EINVAL; + } + + } + + spin_lock_irqsave(&spi100k->lock, flags); + list_add_tail(&m->queue, &spi100k->msg_queue); + queue_work(omap1_spi100k_wq, &spi100k->work); + spin_unlock_irqrestore(&spi100k->lock, flags); + + return 0; +} + +static int __init omap1_spi100k_reset(struct omap1_spi100k *spi100k) +{ + return 0; +} + +static int __devinit omap1_spi100k_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct omap1_spi100k *spi100k; + int status = 0; + + if (!pdev->id) + return -EINVAL; + + master = spi_alloc_master(&pdev->dev, sizeof *spi100k); + if (master == NULL) { + dev_dbg(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + + if (pdev->id != -1) + master->bus_num = pdev->id; + + master->setup = omap1_spi100k_setup; + master->transfer = omap1_spi100k_transfer; + master->cleanup = NULL; + master->num_chipselect = 2; + master->mode_bits = MODEBITS; + + dev_set_drvdata(&pdev->dev, master); + + spi100k = spi_master_get_devdata(master); + spi100k->master = master; + + /* + * The memory region base address is taken as the platform_data. + * You should allocate this with ioremap() before initializing + * the SPI. + */ + spi100k->base = (void __iomem *) pdev->dev.platform_data; + + INIT_WORK(&spi100k->work, omap1_spi100k_work); + + spin_lock_init(&spi100k->lock); + INIT_LIST_HEAD(&spi100k->msg_queue); + spi100k->ick = clk_get(&pdev->dev, "ick"); + if (IS_ERR(spi100k->ick)) { + dev_dbg(&pdev->dev, "can't get spi100k_ick\n"); + status = PTR_ERR(spi100k->ick); + goto err1; + } + + spi100k->fck = clk_get(&pdev->dev, "fck"); + if (IS_ERR(spi100k->fck)) { + dev_dbg(&pdev->dev, "can't get spi100k_fck\n"); + status = PTR_ERR(spi100k->fck); + goto err2; + } + + if (omap1_spi100k_reset(spi100k) < 0) + goto err3; + + status = spi_register_master(master); + if (status < 0) + goto err3; + + spi100k->state = SPI_RUNNING; + + return status; + +err3: + clk_put(spi100k->fck); +err2: + clk_put(spi100k->ick); +err1: + spi_master_put(master); + return status; +} + +static int __exit omap1_spi100k_remove(struct platform_device *pdev) +{ + struct spi_master *master; + struct omap1_spi100k *spi100k; + struct resource *r; + unsigned limit = 500; + unsigned long flags; + int status = 0; + + master = dev_get_drvdata(&pdev->dev); + spi100k = spi_master_get_devdata(master); + + spin_lock_irqsave(&spi100k->lock, flags); + + spi100k->state = SPI_SHUTDOWN; + while (!list_empty(&spi100k->msg_queue) && limit--) { + spin_unlock_irqrestore(&spi100k->lock, flags); + msleep(10); + spin_lock_irqsave(&spi100k->lock, flags); + } + + if (!list_empty(&spi100k->msg_queue)) + status = -EBUSY; + + spin_unlock_irqrestore(&spi100k->lock, flags); + + if (status != 0) + return status; + + clk_put(spi100k->fck); + clk_put(spi100k->ick); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + spi_unregister_master(master); + + return 0; +} + +static struct platform_driver omap1_spi100k_driver = { + .driver = { + .name = "omap1_spi100k", + .owner = THIS_MODULE, + }, + .remove = __exit_p(omap1_spi100k_remove), +}; + + +static int __init omap1_spi100k_init(void) +{ + omap1_spi100k_wq = create_singlethread_workqueue( + omap1_spi100k_driver.driver.name); + + if (omap1_spi100k_wq == NULL) + return -1; + + return platform_driver_probe(&omap1_spi100k_driver, omap1_spi100k_probe); +} + +static void __exit omap1_spi100k_exit(void) +{ + platform_driver_unregister(&omap1_spi100k_driver); + + destroy_workqueue(omap1_spi100k_wq); +} + +module_init(omap1_spi100k_init); +module_exit(omap1_spi100k_exit); + +MODULE_DESCRIPTION("OMAP7xx SPI 100k controller driver"); +MODULE_AUTHOR("Fabrice Crohas "); +MODULE_LICENSE("GPL"); + -- cgit v1.2.3 From 965346e3b99e2c5f51bd1325ddd0257227000355 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Sun, 13 Dec 2009 01:03:12 -0700 Subject: spi: fix probe/remove section markings Probe/remove functions need to be marked as __devinit and __devexit (not __init an __exit) to prevent trying to run code that has been discarded. This patch fixes the spi_imx driver to mark probe and remove correctly. Signed-off-by: Grant Likely --- drivers/spi/spi_imx.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index e334747ba2d9..1893f1e96dc4 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -484,7 +484,7 @@ static void spi_imx_cleanup(struct spi_device *spi) { } -static int __init spi_imx_probe(struct platform_device *pdev) +static int __devinit spi_imx_probe(struct platform_device *pdev) { struct spi_imx_master *mxc_platform_info; struct spi_master *master; @@ -634,7 +634,7 @@ out_master_put: return ret; } -static int __exit spi_imx_remove(struct platform_device *pdev) +static int __devexit spi_imx_remove(struct platform_device *pdev) { struct spi_master *master = platform_get_drvdata(pdev); struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -668,7 +668,7 @@ static struct platform_driver spi_imx_driver = { .owner = THIS_MODULE, }, .probe = spi_imx_probe, - .remove = __exit_p(spi_imx_remove), + .remove = __devexit_p(spi_imx_remove), }; static int __init spi_imx_init(void) -- cgit v1.2.3