diff options
author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2012-12-15 23:51:19 +0100 |
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committer | Simon Horman <horms+renesas@verge.net.au> | 2013-01-25 09:24:25 +0900 |
commit | 6e54d8d252ed09ae148af6565971974af9a96e10 (patch) | |
tree | ac4e0c344ec0e371decf95663d75f7918bd33bbc /drivers/pinctrl | |
parent | 56dc04af3b5e54be330e18630301d2bda5d365eb (diff) | |
download | linux-6e54d8d252ed09ae148af6565971974af9a96e10.tar.bz2 |
sh-pfc: Move driver from drivers/sh/ to drivers/pinctrl/
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r-- | drivers/pinctrl/Kconfig | 2 | ||||
-rw-r--r-- | drivers/pinctrl/Makefile | 2 | ||||
-rw-r--r-- | drivers/pinctrl/sh-pfc/Kconfig | 24 | ||||
-rw-r--r-- | drivers/pinctrl/sh-pfc/Makefile | 5 | ||||
-rw-r--r-- | drivers/pinctrl/sh-pfc/core.c | 586 | ||||
-rw-r--r-- | drivers/pinctrl/sh-pfc/core.h | 54 | ||||
-rw-r--r-- | drivers/pinctrl/sh-pfc/gpio.c | 179 | ||||
-rw-r--r-- | drivers/pinctrl/sh-pfc/pinctrl.c | 464 |
8 files changed, 1315 insertions, 1 deletions
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index c31aeb01bb00..a9d390421b4f 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -196,7 +196,7 @@ config PINCTRL_EXYNOS5440 select PINCONF source "drivers/pinctrl/mvebu/Kconfig" - +source "drivers/pinctrl/sh-pfc/Kconfig" source "drivers/pinctrl/spear/Kconfig" config PINCTRL_XWAY diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index fc4606f27dc7..04e2c6dafbaa 100644 --- a/drivers/pinctrl/Makefile +++ b/drivers/pinctrl/Makefile @@ -42,4 +42,6 @@ obj-$(CONFIG_PINCTRL_XWAY) += pinctrl-xway.o obj-$(CONFIG_PINCTRL_LANTIQ) += pinctrl-lantiq.o obj-$(CONFIG_PLAT_ORION) += mvebu/ +obj-$(CONFIG_ARCH_SHMOBILE) += sh-pfc/ +obj-$(CONFIG_SUPERH) += sh-pfc/ obj-$(CONFIG_PLAT_SPEAR) += spear/ diff --git a/drivers/pinctrl/sh-pfc/Kconfig b/drivers/pinctrl/sh-pfc/Kconfig new file mode 100644 index 000000000000..ae69dbe18bfd --- /dev/null +++ b/drivers/pinctrl/sh-pfc/Kconfig @@ -0,0 +1,24 @@ +# +# Renesas SH and SH Mobile PINCTRL drivers +# + +if ARCH_SHMOBILE || SUPERH + +config PINCTRL_SH_PFC + # XXX move off the gpio dependency + depends on GENERIC_GPIO + select GPIO_SH_PFC if ARCH_REQUIRE_GPIOLIB + select PINMUX + select PINCONF + def_bool y + help + This enables pin control drivers for SH and SH Mobile platforms + +config GPIO_SH_PFC + bool "SuperH PFC GPIO support" + depends on PINCTRL_SH_PFC && GPIOLIB + help + This enables support for GPIOs within the SoC's pin function + controller. + +endif diff --git a/drivers/pinctrl/sh-pfc/Makefile b/drivers/pinctrl/sh-pfc/Makefile new file mode 100644 index 000000000000..6ba6fb26cde9 --- /dev/null +++ b/drivers/pinctrl/sh-pfc/Makefile @@ -0,0 +1,5 @@ +sh-pfc-objs = core.o pinctrl.o +ifeq ($(CONFIG_GPIO_SH_PFC),y) +sh-pfc-objs += gpio.o +endif +obj-$(CONFIG_PINCTRL_SH_PFC) += sh-pfc.o diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c new file mode 100644 index 000000000000..8e7818bccb29 --- /dev/null +++ b/drivers/pinctrl/sh-pfc/core.c @@ -0,0 +1,586 @@ +/* + * SuperH Pin Function Controller support. + * + * Copyright (C) 2008 Magnus Damm + * Copyright (C) 2009 - 2012 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#define DRV_NAME "sh-pfc" +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/pinctrl/machine.h> +#include <linux/platform_device.h> +#include <linux/sh_pfc.h> +#include <linux/slab.h> + +#include "core.h" + +static int sh_pfc_ioremap(struct sh_pfc *pfc, struct platform_device *pdev) +{ + struct resource *res; + int k; + + if (pdev->num_resources == 0) { + pfc->num_windows = 0; + return 0; + } + + pfc->window = devm_kzalloc(pfc->dev, pdev->num_resources * + sizeof(*pfc->window), GFP_NOWAIT); + if (!pfc->window) + return -ENOMEM; + + pfc->num_windows = pdev->num_resources; + + for (k = 0, res = pdev->resource; k < pdev->num_resources; k++, res++) { + WARN_ON(resource_type(res) != IORESOURCE_MEM); + pfc->window[k].phys = res->start; + pfc->window[k].size = resource_size(res); + pfc->window[k].virt = devm_ioremap_nocache(pfc->dev, res->start, + resource_size(res)); + if (!pfc->window[k].virt) + return -ENOMEM; + } + + return 0; +} + +static void __iomem *sh_pfc_phys_to_virt(struct sh_pfc *pfc, + unsigned long address) +{ + struct sh_pfc_window *window; + int k; + + /* scan through physical windows and convert address */ + for (k = 0; k < pfc->num_windows; k++) { + window = pfc->window + k; + + if (address < window->phys) + continue; + + if (address >= (window->phys + window->size)) + continue; + + return window->virt + (address - window->phys); + } + + /* no windows defined, register must be 1:1 mapped virt:phys */ + return (void __iomem *)address; +} + +static int sh_pfc_enum_in_range(pinmux_enum_t enum_id, struct pinmux_range *r) +{ + if (enum_id < r->begin) + return 0; + + if (enum_id > r->end) + return 0; + + return 1; +} + +static unsigned long sh_pfc_read_raw_reg(void __iomem *mapped_reg, + unsigned long reg_width) +{ + switch (reg_width) { + case 8: + return ioread8(mapped_reg); + case 16: + return ioread16(mapped_reg); + case 32: + return ioread32(mapped_reg); + } + + BUG(); + return 0; +} + +static void sh_pfc_write_raw_reg(void __iomem *mapped_reg, + unsigned long reg_width, unsigned long data) +{ + switch (reg_width) { + case 8: + iowrite8(data, mapped_reg); + return; + case 16: + iowrite16(data, mapped_reg); + return; + case 32: + iowrite32(data, mapped_reg); + return; + } + + BUG(); +} + +int sh_pfc_read_bit(struct pinmux_data_reg *dr, unsigned long in_pos) +{ + unsigned long pos; + + pos = dr->reg_width - (in_pos + 1); + + pr_debug("read_bit: addr = %lx, pos = %ld, " + "r_width = %ld\n", dr->reg, pos, dr->reg_width); + + return (sh_pfc_read_raw_reg(dr->mapped_reg, dr->reg_width) >> pos) & 1; +} + +void sh_pfc_write_bit(struct pinmux_data_reg *dr, unsigned long in_pos, + unsigned long value) +{ + unsigned long pos; + + pos = dr->reg_width - (in_pos + 1); + + pr_debug("write_bit addr = %lx, value = %d, pos = %ld, " + "r_width = %ld\n", + dr->reg, !!value, pos, dr->reg_width); + + if (value) + set_bit(pos, &dr->reg_shadow); + else + clear_bit(pos, &dr->reg_shadow); + + sh_pfc_write_raw_reg(dr->mapped_reg, dr->reg_width, dr->reg_shadow); +} + +static void sh_pfc_config_reg_helper(struct sh_pfc *pfc, + struct pinmux_cfg_reg *crp, + unsigned long in_pos, + void __iomem **mapped_regp, + unsigned long *maskp, + unsigned long *posp) +{ + int k; + + *mapped_regp = sh_pfc_phys_to_virt(pfc, crp->reg); + + if (crp->field_width) { + *maskp = (1 << crp->field_width) - 1; + *posp = crp->reg_width - ((in_pos + 1) * crp->field_width); + } else { + *maskp = (1 << crp->var_field_width[in_pos]) - 1; + *posp = crp->reg_width; + for (k = 0; k <= in_pos; k++) + *posp -= crp->var_field_width[k]; + } +} + +static int sh_pfc_read_config_reg(struct sh_pfc *pfc, + struct pinmux_cfg_reg *crp, + unsigned long field) +{ + void __iomem *mapped_reg; + unsigned long mask, pos; + + sh_pfc_config_reg_helper(pfc, crp, field, &mapped_reg, &mask, &pos); + + pr_debug("read_reg: addr = %lx, field = %ld, " + "r_width = %ld, f_width = %ld\n", + crp->reg, field, crp->reg_width, crp->field_width); + + return (sh_pfc_read_raw_reg(mapped_reg, crp->reg_width) >> pos) & mask; +} + +static void sh_pfc_write_config_reg(struct sh_pfc *pfc, + struct pinmux_cfg_reg *crp, + unsigned long field, unsigned long value) +{ + void __iomem *mapped_reg; + unsigned long mask, pos, data; + + sh_pfc_config_reg_helper(pfc, crp, field, &mapped_reg, &mask, &pos); + + pr_debug("write_reg addr = %lx, value = %ld, field = %ld, " + "r_width = %ld, f_width = %ld\n", + crp->reg, value, field, crp->reg_width, crp->field_width); + + mask = ~(mask << pos); + value = value << pos; + + data = sh_pfc_read_raw_reg(mapped_reg, crp->reg_width); + data &= mask; + data |= value; + + if (pfc->pdata->unlock_reg) + sh_pfc_write_raw_reg( + sh_pfc_phys_to_virt(pfc, pfc->pdata->unlock_reg), 32, + ~data); + + sh_pfc_write_raw_reg(mapped_reg, crp->reg_width, data); +} + +static int sh_pfc_setup_data_reg(struct sh_pfc *pfc, unsigned gpio) +{ + struct pinmux_gpio *gpiop = &pfc->pdata->gpios[gpio]; + struct pinmux_data_reg *data_reg; + int k, n; + + if (!sh_pfc_enum_in_range(gpiop->enum_id, &pfc->pdata->data)) + return -1; + + k = 0; + while (1) { + data_reg = pfc->pdata->data_regs + k; + + if (!data_reg->reg_width) + break; + + data_reg->mapped_reg = sh_pfc_phys_to_virt(pfc, data_reg->reg); + + for (n = 0; n < data_reg->reg_width; n++) { + if (data_reg->enum_ids[n] == gpiop->enum_id) { + gpiop->flags &= ~PINMUX_FLAG_DREG; + gpiop->flags |= (k << PINMUX_FLAG_DREG_SHIFT); + gpiop->flags &= ~PINMUX_FLAG_DBIT; + gpiop->flags |= (n << PINMUX_FLAG_DBIT_SHIFT); + return 0; + } + } + k++; + } + + BUG(); + + return -1; +} + +static void sh_pfc_setup_data_regs(struct sh_pfc *pfc) +{ + struct pinmux_data_reg *drp; + int k; + + for (k = pfc->pdata->first_gpio; k <= pfc->pdata->last_gpio; k++) + sh_pfc_setup_data_reg(pfc, k); + + k = 0; + while (1) { + drp = pfc->pdata->data_regs + k; + + if (!drp->reg_width) + break; + + drp->reg_shadow = sh_pfc_read_raw_reg(drp->mapped_reg, + drp->reg_width); + k++; + } +} + +int sh_pfc_get_data_reg(struct sh_pfc *pfc, unsigned gpio, + struct pinmux_data_reg **drp, int *bitp) +{ + struct pinmux_gpio *gpiop = &pfc->pdata->gpios[gpio]; + int k, n; + + if (!sh_pfc_enum_in_range(gpiop->enum_id, &pfc->pdata->data)) + return -1; + + k = (gpiop->flags & PINMUX_FLAG_DREG) >> PINMUX_FLAG_DREG_SHIFT; + n = (gpiop->flags & PINMUX_FLAG_DBIT) >> PINMUX_FLAG_DBIT_SHIFT; + *drp = pfc->pdata->data_regs + k; + *bitp = n; + return 0; +} + +static int sh_pfc_get_config_reg(struct sh_pfc *pfc, pinmux_enum_t enum_id, + struct pinmux_cfg_reg **crp, int *fieldp, + int *valuep, unsigned long **cntp) +{ + struct pinmux_cfg_reg *config_reg; + unsigned long r_width, f_width, curr_width, ncomb; + int k, m, n, pos, bit_pos; + + k = 0; + while (1) { + config_reg = pfc->pdata->cfg_regs + k; + + r_width = config_reg->reg_width; + f_width = config_reg->field_width; + + if (!r_width) + break; + + pos = 0; + m = 0; + for (bit_pos = 0; bit_pos < r_width; bit_pos += curr_width) { + if (f_width) + curr_width = f_width; + else + curr_width = config_reg->var_field_width[m]; + + ncomb = 1 << curr_width; + for (n = 0; n < ncomb; n++) { + if (config_reg->enum_ids[pos + n] == enum_id) { + *crp = config_reg; + *fieldp = m; + *valuep = n; + *cntp = &config_reg->cnt[m]; + return 0; + } + } + pos += ncomb; + m++; + } + k++; + } + + return -1; +} + +int sh_pfc_gpio_to_enum(struct sh_pfc *pfc, unsigned gpio, int pos, + pinmux_enum_t *enum_idp) +{ + pinmux_enum_t enum_id = pfc->pdata->gpios[gpio].enum_id; + pinmux_enum_t *data = pfc->pdata->gpio_data; + int k; + + if (!sh_pfc_enum_in_range(enum_id, &pfc->pdata->data)) { + if (!sh_pfc_enum_in_range(enum_id, &pfc->pdata->mark)) { + pr_err("non data/mark enum_id for gpio %d\n", gpio); + return -1; + } + } + + if (pos) { + *enum_idp = data[pos + 1]; + return pos + 1; + } + + for (k = 0; k < pfc->pdata->gpio_data_size; k++) { + if (data[k] == enum_id) { + *enum_idp = data[k + 1]; + return k + 1; + } + } + + pr_err("cannot locate data/mark enum_id for gpio %d\n", gpio); + return -1; +} + +int sh_pfc_config_gpio(struct sh_pfc *pfc, unsigned gpio, int pinmux_type, + int cfg_mode) +{ + struct pinmux_cfg_reg *cr = NULL; + pinmux_enum_t enum_id; + struct pinmux_range *range; + int in_range, pos, field, value; + unsigned long *cntp; + + switch (pinmux_type) { + + case PINMUX_TYPE_FUNCTION: + range = NULL; + break; + + case PINMUX_TYPE_OUTPUT: + range = &pfc->pdata->output; + break; + + case PINMUX_TYPE_INPUT: + range = &pfc->pdata->input; + break; + + case PINMUX_TYPE_INPUT_PULLUP: + range = &pfc->pdata->input_pu; + break; + + case PINMUX_TYPE_INPUT_PULLDOWN: + range = &pfc->pdata->input_pd; + break; + + default: + goto out_err; + } + + pos = 0; + enum_id = 0; + field = 0; + value = 0; + while (1) { + pos = sh_pfc_gpio_to_enum(pfc, gpio, pos, &enum_id); + if (pos <= 0) + goto out_err; + + if (!enum_id) + break; + + /* first check if this is a function enum */ + in_range = sh_pfc_enum_in_range(enum_id, &pfc->pdata->function); + if (!in_range) { + /* not a function enum */ + if (range) { + /* + * other range exists, so this pin is + * a regular GPIO pin that now is being + * bound to a specific direction. + * + * for this case we only allow function enums + * and the enums that match the other range. + */ + in_range = sh_pfc_enum_in_range(enum_id, range); + + /* + * special case pass through for fixed + * input-only or output-only pins without + * function enum register association. + */ + if (in_range && enum_id == range->force) + continue; + } else { + /* + * no other range exists, so this pin + * must then be of the function type. + * + * allow function type pins to select + * any combination of function/in/out + * in their MARK lists. + */ + in_range = 1; + } + } + + if (!in_range) + continue; + + if (sh_pfc_get_config_reg(pfc, enum_id, &cr, + &field, &value, &cntp) != 0) + goto out_err; + + switch (cfg_mode) { + case GPIO_CFG_DRYRUN: + if (!*cntp || + (sh_pfc_read_config_reg(pfc, cr, field) != value)) + continue; + break; + + case GPIO_CFG_REQ: + sh_pfc_write_config_reg(pfc, cr, field, value); + *cntp = *cntp + 1; + break; + + case GPIO_CFG_FREE: + *cntp = *cntp - 1; + break; + } + } + + return 0; + out_err: + return -1; +} + +static int sh_pfc_probe(struct platform_device *pdev) +{ + struct sh_pfc_platform_data *pdata = pdev->dev.platform_data; + struct sh_pfc *pfc; + int ret; + + /* + * Ensure that the type encoding fits + */ + BUILD_BUG_ON(PINMUX_FLAG_TYPE > ((1 << PINMUX_FLAG_DBIT_SHIFT) - 1)); + + if (pdata == NULL) + return -ENODEV; + + pfc = devm_kzalloc(&pdev->dev, sizeof(pfc), GFP_KERNEL); + if (pfc == NULL) + return -ENOMEM; + + pfc->pdata = pdata; + pfc->dev = &pdev->dev; + + ret = sh_pfc_ioremap(pfc, pdev); + if (unlikely(ret < 0)) + return ret; + + spin_lock_init(&pfc->lock); + + pinctrl_provide_dummies(); + sh_pfc_setup_data_regs(pfc); + + /* + * Initialize pinctrl bindings first + */ + ret = sh_pfc_register_pinctrl(pfc); + if (unlikely(ret != 0)) + return ret; + +#ifdef CONFIG_GPIO_SH_PFC + /* + * Then the GPIO chip + */ + ret = sh_pfc_register_gpiochip(pfc); + if (unlikely(ret != 0)) { + /* + * If the GPIO chip fails to come up we still leave the + * PFC state as it is, given that there are already + * extant users of it that have succeeded by this point. + */ + pr_notice("failed to init GPIO chip, ignoring...\n"); + } +#endif + + platform_set_drvdata(pdev, pfc); + + pr_info("%s support registered\n", pdata->name); + + return 0; +} + +static int sh_pfc_remove(struct platform_device *pdev) +{ + struct sh_pfc *pfc = platform_get_drvdata(pdev); + +#ifdef CONFIG_GPIO_SH_PFC + sh_pfc_unregister_gpiochip(pfc); +#endif + sh_pfc_unregister_pinctrl(pfc); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static const struct platform_device_id sh_pfc_id_table[] = { + { "sh-pfc", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(platform, sh_pfc_id_table); + +static struct platform_driver sh_pfc_driver = { + .probe = sh_pfc_probe, + .remove = sh_pfc_remove, + .id_table = sh_pfc_id_table, + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, +}; + +static int __init sh_pfc_init(void) +{ + return platform_driver_register(&sh_pfc_driver); +} +postcore_initcall(sh_pfc_init); + +static void __exit sh_pfc_exit(void) +{ + platform_driver_unregister(&sh_pfc_driver); +} +module_exit(sh_pfc_exit); + +MODULE_AUTHOR("Magnus Damm, Paul Mundt, Laurent Pinchart"); +MODULE_DESCRIPTION("Pin Control and GPIO driver for SuperH pin function controller"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/pinctrl/sh-pfc/core.h b/drivers/pinctrl/sh-pfc/core.h new file mode 100644 index 000000000000..87ae5fd2a201 --- /dev/null +++ b/drivers/pinctrl/sh-pfc/core.h @@ -0,0 +1,54 @@ +/* + * SuperH Pin Function Controller support. + * + * Copyright (C) 2012 Renesas Solutions Corp. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#ifndef __SH_PFC_CORE_H__ +#define __SH_PFC_CORE_H__ + +#include <linux/compiler.h> +#include <linux/sh_pfc.h> +#include <linux/types.h> + +struct sh_pfc_window { + phys_addr_t phys; + void __iomem *virt; + unsigned long size; +}; + +struct sh_pfc_chip; +struct sh_pfc_pinctrl; + +struct sh_pfc { + struct device *dev; + struct sh_pfc_platform_data *pdata; + spinlock_t lock; + + unsigned int num_windows; + struct sh_pfc_window *window; + + struct sh_pfc_chip *gpio; + struct sh_pfc_pinctrl *pinctrl; +}; + +int sh_pfc_register_gpiochip(struct sh_pfc *pfc); +int sh_pfc_unregister_gpiochip(struct sh_pfc *pfc); + +int sh_pfc_register_pinctrl(struct sh_pfc *pfc); +int sh_pfc_unregister_pinctrl(struct sh_pfc *pfc); + +int sh_pfc_read_bit(struct pinmux_data_reg *dr, unsigned long in_pos); +void sh_pfc_write_bit(struct pinmux_data_reg *dr, unsigned long in_pos, + unsigned long value); +int sh_pfc_get_data_reg(struct sh_pfc *pfc, unsigned gpio, + struct pinmux_data_reg **drp, int *bitp); +int sh_pfc_gpio_to_enum(struct sh_pfc *pfc, unsigned gpio, int pos, + pinmux_enum_t *enum_idp); +int sh_pfc_config_gpio(struct sh_pfc *pfc, unsigned gpio, int pinmux_type, + int cfg_mode); + +#endif /* __SH_PFC_CORE_H__ */ diff --git a/drivers/pinctrl/sh-pfc/gpio.c b/drivers/pinctrl/sh-pfc/gpio.c new file mode 100644 index 000000000000..a0454f321710 --- /dev/null +++ b/drivers/pinctrl/sh-pfc/gpio.c @@ -0,0 +1,179 @@ +/* + * SuperH Pin Function Controller GPIO driver. + * + * Copyright (C) 2008 Magnus Damm + * Copyright (C) 2009 - 2012 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME " gpio: " fmt + +#include <linux/device.h> +#include <linux/gpio.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pinctrl/consumer.h> +#include <linux/sh_pfc.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "core.h" + +struct sh_pfc_chip { + struct sh_pfc *pfc; + struct gpio_chip gpio_chip; +}; + +static struct sh_pfc_chip *gpio_to_pfc_chip(struct gpio_chip *gc) +{ + return container_of(gc, struct sh_pfc_chip, gpio_chip); +} + +static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc) +{ + return gpio_to_pfc_chip(gc)->pfc; +} + +static int sh_gpio_request(struct gpio_chip *gc, unsigned offset) +{ + return pinctrl_request_gpio(offset); +} + +static void sh_gpio_free(struct gpio_chip *gc, unsigned offset) +{ + pinctrl_free_gpio(offset); +} + +static void sh_gpio_set_value(struct sh_pfc *pfc, unsigned gpio, int value) +{ + struct pinmux_data_reg *dr = NULL; + int bit = 0; + + if (sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0) + BUG(); + else + sh_pfc_write_bit(dr, bit, value); +} + +static int sh_gpio_get_value(struct sh_pfc *pfc, unsigned gpio) +{ + struct pinmux_data_reg *dr = NULL; + int bit = 0; + + if (sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0) + return -EINVAL; + + return sh_pfc_read_bit(dr, bit); +} + +static int sh_gpio_direction_input(struct gpio_chip *gc, unsigned offset) +{ + return pinctrl_gpio_direction_input(offset); +} + +static int sh_gpio_direction_output(struct gpio_chip *gc, unsigned offset, + int value) +{ + sh_gpio_set_value(gpio_to_pfc(gc), offset, value); + + return pinctrl_gpio_direction_output(offset); +} + +static int sh_gpio_get(struct gpio_chip *gc, unsigned offset) +{ + return sh_gpio_get_value(gpio_to_pfc(gc), offset); +} + +static void sh_gpio_set(struct gpio_chip *gc, unsigned offset, int value) +{ + sh_gpio_set_value(gpio_to_pfc(gc), offset, value); +} + +static int sh_gpio_to_irq(struct gpio_chip *gc, unsigned offset) +{ + struct sh_pfc *pfc = gpio_to_pfc(gc); + pinmux_enum_t enum_id; + pinmux_enum_t *enum_ids; + int i, k, pos; + + pos = 0; + enum_id = 0; + while (1) { + pos = sh_pfc_gpio_to_enum(pfc, offset, pos, &enum_id); + if (pos <= 0 || !enum_id) + break; + + for (i = 0; i < pfc->pdata->gpio_irq_size; i++) { + enum_ids = pfc->pdata->gpio_irq[i].enum_ids; + for (k = 0; enum_ids[k]; k++) { + if (enum_ids[k] == enum_id) + return pfc->pdata->gpio_irq[i].irq; + } + } + } + + return -ENOSYS; +} + +static void sh_pfc_gpio_setup(struct sh_pfc_chip *chip) +{ + struct sh_pfc *pfc = chip->pfc; + struct gpio_chip *gc = &chip->gpio_chip; + + gc->request = sh_gpio_request; + gc->free = sh_gpio_free; + gc->direction_input = sh_gpio_direction_input; + gc->get = sh_gpio_get; + gc->direction_output = sh_gpio_direction_output; + gc->set = sh_gpio_set; + gc->to_irq = sh_gpio_to_irq; + + WARN_ON(pfc->pdata->first_gpio != 0); /* needs testing */ + + gc->label = pfc->pdata->name; + gc->owner = THIS_MODULE; + gc->base = pfc->pdata->first_gpio; + gc->ngpio = (pfc->pdata->last_gpio - pfc->pdata->first_gpio) + 1; +} + +int sh_pfc_register_gpiochip(struct sh_pfc *pfc) +{ + struct sh_pfc_chip *chip; + int ret; + + chip = devm_kzalloc(pfc->dev, sizeof(*chip), GFP_KERNEL); + if (unlikely(!chip)) + return -ENOMEM; + + chip->pfc = pfc; + + sh_pfc_gpio_setup(chip); + + ret = gpiochip_add(&chip->gpio_chip); + if (unlikely(ret < 0)) + return ret; + + pfc->gpio = chip; + + pr_info("%s handling gpio %d -> %d\n", + pfc->pdata->name, pfc->pdata->first_gpio, + pfc->pdata->last_gpio); + + return 0; +} + +int sh_pfc_unregister_gpiochip(struct sh_pfc *pfc) +{ + struct sh_pfc_chip *chip = pfc->gpio; + int ret; + + ret = gpiochip_remove(&chip->gpio_chip); + if (unlikely(ret < 0)) + return ret; + + pfc->gpio = NULL; + return 0; +} diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c new file mode 100644 index 000000000000..221bde03913a --- /dev/null +++ b/drivers/pinctrl/sh-pfc/pinctrl.c @@ -0,0 +1,464 @@ +/* + * SuperH Pin Function Controller pinmux support. + * + * Copyright (C) 2012 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#define DRV_NAME "sh-pfc" +#define pr_fmt(fmt) KBUILD_MODNAME " pinctrl: " fmt + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pinctrl/consumer.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/sh_pfc.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "core.h" + +struct sh_pfc_pinctrl { + struct pinctrl_dev *pctl; + struct sh_pfc *pfc; + + struct pinmux_gpio **functions; + unsigned int nr_functions; + + struct pinctrl_pin_desc *pads; + unsigned int nr_pads; + + spinlock_t lock; +}; + +static int sh_pfc_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->nr_pads; +} + +static const char *sh_pfc_get_group_name(struct pinctrl_dev *pctldev, + unsigned selector) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->pads[selector].name; +} + +static int sh_pfc_get_group_pins(struct pinctrl_dev *pctldev, unsigned group, + const unsigned **pins, unsigned *num_pins) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + *pins = &pmx->pads[group].number; + *num_pins = 1; + + return 0; +} + +static void sh_pfc_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, + unsigned offset) +{ + seq_printf(s, "%s", DRV_NAME); +} + +static struct pinctrl_ops sh_pfc_pinctrl_ops = { + .get_groups_count = sh_pfc_get_groups_count, + .get_group_name = sh_pfc_get_group_name, + .get_group_pins = sh_pfc_get_group_pins, + .pin_dbg_show = sh_pfc_pin_dbg_show, +}; + +static int sh_pfc_get_functions_count(struct pinctrl_dev *pctldev) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->nr_functions; +} + +static const char *sh_pfc_get_function_name(struct pinctrl_dev *pctldev, + unsigned selector) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + return pmx->functions[selector]->name; +} + +static int sh_pfc_get_function_groups(struct pinctrl_dev *pctldev, unsigned func, + const char * const **groups, + unsigned * const num_groups) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + *groups = &pmx->functions[func]->name; + *num_groups = 1; + + return 0; +} + +static int sh_pfc_noop_enable(struct pinctrl_dev *pctldev, unsigned func, + unsigned group) +{ + return 0; +} + +static void sh_pfc_noop_disable(struct pinctrl_dev *pctldev, unsigned func, + unsigned group) +{ +} + +static int sh_pfc_config_function(struct sh_pfc *pfc, unsigned offset) +{ + if (sh_pfc_config_gpio(pfc, offset, + PINMUX_TYPE_FUNCTION, + GPIO_CFG_DRYRUN) != 0) + return -EINVAL; + + if (sh_pfc_config_gpio(pfc, offset, + PINMUX_TYPE_FUNCTION, + GPIO_CFG_REQ) != 0) + return -EINVAL; + + return 0; +} + +static int sh_pfc_reconfig_pin(struct sh_pfc *pfc, unsigned offset, + int new_type) +{ + unsigned long flags; + int pinmux_type; + int ret = -EINVAL; + + spin_lock_irqsave(&pfc->lock, flags); + + pinmux_type = pfc->pdata->gpios[offset].flags & PINMUX_FLAG_TYPE; + + /* + * See if the present config needs to first be de-configured. + */ + switch (pinmux_type) { + case PINMUX_TYPE_GPIO: + break; + case PINMUX_TYPE_OUTPUT: + case PINMUX_TYPE_INPUT: + case PINMUX_TYPE_INPUT_PULLUP: + case PINMUX_TYPE_INPUT_PULLDOWN: + sh_pfc_config_gpio(pfc, offset, pinmux_type, GPIO_CFG_FREE); + break; + default: + goto err; + } + + /* + * Dry run + */ + if (sh_pfc_config_gpio(pfc, offset, new_type, + GPIO_CFG_DRYRUN) != 0) + goto err; + + /* + * Request + */ + if (sh_pfc_config_gpio(pfc, offset, new_type, + GPIO_CFG_REQ) != 0) + goto err; + + pfc->pdata->gpios[offset].flags &= ~PINMUX_FLAG_TYPE; + pfc->pdata->gpios[offset].flags |= new_type; + + ret = 0; + +err: + spin_unlock_irqrestore(&pfc->lock, flags); + + return ret; +} + + +static int sh_pfc_gpio_request_enable(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned offset) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + struct sh_pfc *pfc = pmx->pfc; + unsigned long flags; + int ret, pinmux_type; + + spin_lock_irqsave(&pfc->lock, flags); + + pinmux_type = pfc->pdata->gpios[offset].flags & PINMUX_FLAG_TYPE; + + switch (pinmux_type) { + case PINMUX_TYPE_FUNCTION: + pr_notice_once("Use of GPIO API for function requests is " + "deprecated, convert to pinctrl\n"); + /* handle for now */ + ret = sh_pfc_config_function(pfc, offset); + if (unlikely(ret < 0)) + goto err; + + break; + case PINMUX_TYPE_GPIO: + case PINMUX_TYPE_INPUT: + case PINMUX_TYPE_OUTPUT: + break; + default: + pr_err("Unsupported mux type (%d), bailing...\n", pinmux_type); + ret = -ENOTSUPP; + goto err; + } + + ret = 0; + +err: + spin_unlock_irqrestore(&pfc->lock, flags); + + return ret; +} + +static void sh_pfc_gpio_disable_free(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned offset) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + struct sh_pfc *pfc = pmx->pfc; + unsigned long flags; + int pinmux_type; + + spin_lock_irqsave(&pfc->lock, flags); + + pinmux_type = pfc->pdata->gpios[offset].flags & PINMUX_FLAG_TYPE; + + sh_pfc_config_gpio(pfc, offset, pinmux_type, GPIO_CFG_FREE); + + spin_unlock_irqrestore(&pfc->lock, flags); +} + +static int sh_pfc_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned offset, bool input) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + int type = input ? PINMUX_TYPE_INPUT : PINMUX_TYPE_OUTPUT; + + return sh_pfc_reconfig_pin(pmx->pfc, offset, type); +} + +static struct pinmux_ops sh_pfc_pinmux_ops = { + .get_functions_count = sh_pfc_get_functions_count, + .get_function_name = sh_pfc_get_function_name, + .get_function_groups = sh_pfc_get_function_groups, + .enable = sh_pfc_noop_enable, + .disable = sh_pfc_noop_disable, + .gpio_request_enable = sh_pfc_gpio_request_enable, + .gpio_disable_free = sh_pfc_gpio_disable_free, + .gpio_set_direction = sh_pfc_gpio_set_direction, +}; + +static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin, + unsigned long *config) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + struct sh_pfc *pfc = pmx->pfc; + + *config = pfc->pdata->gpios[pin].flags & PINMUX_FLAG_TYPE; + + return 0; +} + +static int sh_pfc_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin, + unsigned long config) +{ + struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev); + + /* Validate the new type */ + if (config >= PINMUX_FLAG_TYPE) + return -EINVAL; + + return sh_pfc_reconfig_pin(pmx->pfc, pin, config); +} + +static void sh_pfc_pinconf_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, unsigned pin) +{ + const char *pinmux_type_str[] = { + [PINMUX_TYPE_NONE] = "none", + [PINMUX_TYPE_FUNCTION] = "function", + [PINMUX_TYPE_GPIO] = "gpio", + [PINMUX_TYPE_OUTPUT] = "output", + [PINMUX_TYPE_INPUT] = "input", + [PINMUX_TYPE_INPUT_PULLUP] = "input bias pull up", + [PINMUX_TYPE_INPUT_PULLDOWN] = "input bias pull down", + }; + unsigned long config; + int rc; + + rc = sh_pfc_pinconf_get(pctldev, pin, &config); + if (unlikely(rc != 0)) + return; + + seq_printf(s, " %s", pinmux_type_str[config]); +} + +static struct pinconf_ops sh_pfc_pinconf_ops = { + .pin_config_get = sh_pfc_pinconf_get, + .pin_config_set = sh_pfc_pinconf_set, + .pin_config_dbg_show = sh_pfc_pinconf_dbg_show, +}; + +static struct pinctrl_gpio_range sh_pfc_gpio_range = { + .name = DRV_NAME, + .id = 0, +}; + +static struct pinctrl_desc sh_pfc_pinctrl_desc = { + .name = DRV_NAME, + .owner = THIS_MODULE, + .pctlops = &sh_pfc_pinctrl_ops, + .pmxops = &sh_pfc_pinmux_ops, + .confops = &sh_pfc_pinconf_ops, +}; + +static void sh_pfc_map_one_gpio(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx, + struct pinmux_gpio *gpio, unsigned offset) +{ + struct pinmux_data_reg *dummy; + unsigned long flags; + int bit; + + gpio->flags &= ~PINMUX_FLAG_TYPE; + + if (sh_pfc_get_data_reg(pfc, offset, &dummy, &bit) == 0) + gpio->flags |= PINMUX_TYPE_GPIO; + else { + gpio->flags |= PINMUX_TYPE_FUNCTION; + + spin_lock_irqsave(&pmx->lock, flags); + pmx->nr_functions++; + spin_unlock_irqrestore(&pmx->lock, flags); + } +} + +/* pinmux ranges -> pinctrl pin descs */ +static int sh_pfc_map_gpios(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx) +{ + unsigned long flags; + int i; + + pmx->nr_pads = pfc->pdata->last_gpio - pfc->pdata->first_gpio + 1; + + pmx->pads = devm_kzalloc(pfc->dev, sizeof(*pmx->pads) * pmx->nr_pads, + GFP_KERNEL); + if (unlikely(!pmx->pads)) { + pmx->nr_pads = 0; + return -ENOMEM; + } + + spin_lock_irqsave(&pfc->lock, flags); + + /* + * We don't necessarily have a 1:1 mapping between pin and linux + * GPIO number, as the latter maps to the associated enum_id. + * Care needs to be taken to translate back to pin space when + * dealing with any pin configurations. + */ + for (i = 0; i < pmx->nr_pads; i++) { + struct pinctrl_pin_desc *pin = pmx->pads + i; + struct pinmux_gpio *gpio = pfc->pdata->gpios + i; + + pin->number = pfc->pdata->first_gpio + i; + pin->name = gpio->name; + + /* XXX */ + if (unlikely(!gpio->enum_id)) + continue; + + sh_pfc_map_one_gpio(pfc, pmx, gpio, i); + } + + spin_unlock_irqrestore(&pfc->lock, flags); + + sh_pfc_pinctrl_desc.pins = pmx->pads; + sh_pfc_pinctrl_desc.npins = pmx->nr_pads; + + return 0; +} + +static int sh_pfc_map_functions(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx) +{ + unsigned long flags; + int i, fn; + + pmx->functions = devm_kzalloc(pfc->dev, pmx->nr_functions * + sizeof(*pmx->functions), GFP_KERNEL); + if (unlikely(!pmx->functions)) + return -ENOMEM; + + spin_lock_irqsave(&pmx->lock, flags); + + for (i = fn = 0; i < pmx->nr_pads; i++) { + struct pinmux_gpio *gpio = pfc->pdata->gpios + i; + + if ((gpio->flags & PINMUX_FLAG_TYPE) == PINMUX_TYPE_FUNCTION) + pmx->functions[fn++] = gpio; + } + + spin_unlock_irqrestore(&pmx->lock, flags); + + return 0; +} + +int sh_pfc_register_pinctrl(struct sh_pfc *pfc) +{ + struct sh_pfc_pinctrl *pmx; + int ret; + + pmx = devm_kzalloc(pfc->dev, sizeof(*pmx), GFP_KERNEL); + if (unlikely(!pmx)) + return -ENOMEM; + + spin_lock_init(&pmx->lock); + + pmx->pfc = pfc; + pfc->pinctrl = pmx; + + ret = sh_pfc_map_gpios(pfc, pmx); + if (unlikely(ret != 0)) + return ret; + + ret = sh_pfc_map_functions(pfc, pmx); + if (unlikely(ret != 0)) + return ret; + + pmx->pctl = pinctrl_register(&sh_pfc_pinctrl_desc, pfc->dev, pmx); + if (IS_ERR(pmx->pctl)) + return PTR_ERR(pmx->pctl); + + sh_pfc_gpio_range.npins = pfc->pdata->last_gpio + - pfc->pdata->first_gpio + 1; + sh_pfc_gpio_range.base = pfc->pdata->first_gpio; + sh_pfc_gpio_range.pin_base = pfc->pdata->first_gpio; + + pinctrl_add_gpio_range(pmx->pctl, &sh_pfc_gpio_range); + + return 0; +} + +int sh_pfc_unregister_pinctrl(struct sh_pfc *pfc) +{ + struct sh_pfc_pinctrl *pmx = pfc->pinctrl; + + pinctrl_unregister(pmx->pctl); + + pfc->pinctrl = NULL; + return 0; +} |