diff options
| -rw-r--r-- | Documentation/devicetree/bindings/hsi/nokia-modem.txt | 57 | ||||
| -rw-r--r-- | drivers/hsi/clients/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/hsi/clients/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hsi/clients/nokia-modem.c | 285 |
4 files changed, 352 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/hsi/nokia-modem.txt b/Documentation/devicetree/bindings/hsi/nokia-modem.txt new file mode 100644 index 000000000000..8a979780452b --- /dev/null +++ b/Documentation/devicetree/bindings/hsi/nokia-modem.txt @@ -0,0 +1,57 @@ +Nokia modem client bindings + +The Nokia modem HSI client follows the common HSI client binding +and inherits all required properties. The following additional +properties are needed by the Nokia modem HSI client: + +Required properties: +- compatible: Should be one of + "nokia,n900-modem" +- hsi-channel-names: Should contain the following strings + "mcsaab-control" + "speech-control" + "speech-data" + "mcsaab-data" +- gpios: Should provide a GPIO handler for each GPIO listed in + gpio-names +- gpio-names: Should contain the following strings + "cmt_apeslpx" + "cmt_rst_rq" + "cmt_en" + "cmt_rst" + "cmt_bsi" +- interrupts: Should be IRQ handle for modem's reset indication + +Example: + +&ssi_port { + modem: hsi-client { + compatible = "nokia,n900-modem"; + + pinctrl-names = "default"; + pinctrl-0 = <&modem_pins>; + + hsi-channel-ids = <0>, <1>, <2>, <3>; + hsi-channel-names = "mcsaab-control", + "speech-control", + "speech-data", + "mcsaab-data"; + hsi-speed-kbps = <55000>; + hsi-mode = "frame"; + hsi-flow = "synchronized"; + hsi-arb-mode = "round-robin"; + + interrupts-extended = <&gpio3 8 IRQ_TYPE_EDGE_FALLING>; /* 72 */ + + gpios = <&gpio3 6 GPIO_ACTIVE_HIGH>, /* 70 */ + <&gpio3 9 GPIO_ACTIVE_HIGH>, /* 73 */ + <&gpio3 10 GPIO_ACTIVE_HIGH>, /* 74 */ + <&gpio3 11 GPIO_ACTIVE_HIGH>, /* 75 */ + <&gpio5 29 GPIO_ACTIVE_HIGH>; /* 157 */ + gpio-names = "cmt_apeslpx", + "cmt_rst_rq", + "cmt_en", + "cmt_rst", + "cmt_bsi"; + }; +}; diff --git a/drivers/hsi/clients/Kconfig b/drivers/hsi/clients/Kconfig index 1457cfb5b453..71b9f9ab86e4 100644 --- a/drivers/hsi/clients/Kconfig +++ b/drivers/hsi/clients/Kconfig @@ -4,6 +4,15 @@ comment "HSI clients" +config NOKIA_MODEM + tristate "Nokia Modem" + depends on HSI && SSI_PROTOCOL + help + Say Y here if you want to add support for the modem on Nokia + N900 (Nokia RX-51) hardware. + + If unsure, say N. + config SSI_PROTOCOL tristate "SSI protocol" depends on HSI && PHONET && (OMAP_SSI=y || OMAP_SSI=m) diff --git a/drivers/hsi/clients/Makefile b/drivers/hsi/clients/Makefile index ccbf768ea42b..4d5bc0e0b27b 100644 --- a/drivers/hsi/clients/Makefile +++ b/drivers/hsi/clients/Makefile @@ -2,5 +2,6 @@ # Makefile for HSI clients # +obj-$(CONFIG_NOKIA_MODEM) += nokia-modem.o obj-$(CONFIG_SSI_PROTOCOL) += ssi_protocol.o obj-$(CONFIG_HSI_CHAR) += hsi_char.o diff --git a/drivers/hsi/clients/nokia-modem.c b/drivers/hsi/clients/nokia-modem.c new file mode 100644 index 000000000000..363b780dacea --- /dev/null +++ b/drivers/hsi/clients/nokia-modem.c @@ -0,0 +1,285 @@ +/* + * nokia-modem.c + * + * HSI client driver for Nokia N900 modem. + * + * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#include <linux/gpio/consumer.h> +#include <linux/hsi/hsi.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_gpio.h> +#include <linux/hsi/ssi_protocol.h> + +static unsigned int pm; +module_param(pm, int, 0400); +MODULE_PARM_DESC(pm, + "Enable power management (0=disabled, 1=userland based [default])"); + +struct nokia_modem_gpio { + struct gpio_desc *gpio; + const char *name; +}; + +struct nokia_modem_device { + struct tasklet_struct nokia_modem_rst_ind_tasklet; + int nokia_modem_rst_ind_irq; + struct device *device; + struct nokia_modem_gpio *gpios; + int gpio_amount; + struct hsi_client *ssi_protocol; +}; + +static void do_nokia_modem_rst_ind_tasklet(unsigned long data) +{ + struct nokia_modem_device *modem = (struct nokia_modem_device *)data; + + if (!modem) + return; + + dev_info(modem->device, "CMT rst line change detected\n"); + + if (modem->ssi_protocol) + ssip_reset_event(modem->ssi_protocol); +} + +static irqreturn_t nokia_modem_rst_ind_isr(int irq, void *data) +{ + struct nokia_modem_device *modem = (struct nokia_modem_device *)data; + + tasklet_schedule(&modem->nokia_modem_rst_ind_tasklet); + + return IRQ_HANDLED; +} + +static void nokia_modem_gpio_unexport(struct device *dev) +{ + struct nokia_modem_device *modem = dev_get_drvdata(dev); + int i; + + for (i = 0; i < modem->gpio_amount; i++) { + sysfs_remove_link(&dev->kobj, modem->gpios[i].name); + gpiod_unexport(modem->gpios[i].gpio); + } +} + +static int nokia_modem_gpio_probe(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct nokia_modem_device *modem = dev_get_drvdata(dev); + int gpio_count, gpio_name_count, i, err; + + gpio_count = of_gpio_count(np); + + if (gpio_count < 0) { + dev_err(dev, "missing gpios: %d\n", gpio_count); + return gpio_count; + } + + gpio_name_count = of_property_count_strings(np, "gpio-names"); + + if (gpio_count != gpio_name_count) { + dev_err(dev, "number of gpios does not equal number of gpio names\n"); + return -EINVAL; + } + + modem->gpios = devm_kzalloc(dev, gpio_count * + sizeof(struct nokia_modem_gpio), GFP_KERNEL); + if (!modem->gpios) { + dev_err(dev, "Could not allocate memory for gpios\n"); + return -ENOMEM; + } + + modem->gpio_amount = gpio_count; + + for (i = 0; i < gpio_count; i++) { + modem->gpios[i].gpio = devm_gpiod_get_index(dev, NULL, i); + if (IS_ERR(modem->gpios[i].gpio)) { + dev_err(dev, "Could not get gpio %d\n", i); + return PTR_ERR(modem->gpios[i].gpio); + } + + err = of_property_read_string_index(np, "gpio-names", i, + &(modem->gpios[i].name)); + if (err) { + dev_err(dev, "Could not get gpio name %d\n", i); + return err; + } + + err = gpiod_direction_output(modem->gpios[i].gpio, 0); + if (err) + return err; + + err = gpiod_export(modem->gpios[i].gpio, 0); + if (err) + return err; + + err = gpiod_export_link(dev, modem->gpios[i].name, + modem->gpios[i].gpio); + if (err) + return err; + } + + return 0; +} + +static int nokia_modem_probe(struct device *dev) +{ + struct device_node *np; + struct nokia_modem_device *modem; + struct hsi_client *cl = to_hsi_client(dev); + struct hsi_port *port = hsi_get_port(cl); + int irq, pflags, err; + struct hsi_board_info ssip; + + np = dev->of_node; + if (!np) { + dev_err(dev, "device tree node not found\n"); + return -ENXIO; + } + + modem = devm_kzalloc(dev, sizeof(*modem), GFP_KERNEL); + if (!modem) { + dev_err(dev, "Could not allocate memory for nokia_modem_device\n"); + return -ENOMEM; + } + dev_set_drvdata(dev, modem); + + irq = irq_of_parse_and_map(np, 0); + if (irq < 0) { + dev_err(dev, "Invalid rst_ind interrupt (%d)\n", irq); + return irq; + } + modem->nokia_modem_rst_ind_irq = irq; + pflags = irq_get_trigger_type(irq); + + tasklet_init(&modem->nokia_modem_rst_ind_tasklet, + do_nokia_modem_rst_ind_tasklet, (unsigned long)modem); + err = devm_request_irq(dev, irq, nokia_modem_rst_ind_isr, + IRQF_DISABLED | pflags, "modem_rst_ind", modem); + if (err < 0) { + dev_err(dev, "Request rst_ind irq(%d) failed (flags %d)\n", + irq, pflags); + return err; + } + enable_irq_wake(irq); + + if(pm) { + err = nokia_modem_gpio_probe(dev); + if (err < 0) { + dev_err(dev, "Could not probe GPIOs\n"); + goto error1; + } + } + + ssip.name = "ssi-protocol"; + ssip.tx_cfg = cl->tx_cfg; + ssip.rx_cfg = cl->rx_cfg; + ssip.platform_data = NULL; + ssip.archdata = NULL; + + modem->ssi_protocol = hsi_new_client(port, &ssip); + if (!modem->ssi_protocol) { + dev_err(dev, "Could not register ssi-protocol device\n"); + goto error2; + } + + err = device_attach(&modem->ssi_protocol->device); + if (err == 0) { + dev_err(dev, "Missing ssi-protocol driver\n"); + err = -EPROBE_DEFER; + goto error3; + } else if (err < 0) { + dev_err(dev, "Could not load ssi-protocol driver (%d)\n", err); + goto error3; + } + + /* TODO: register cmt-speech hsi client */ + + dev_info(dev, "Registered Nokia HSI modem\n"); + + return 0; + +error3: + hsi_remove_client(&modem->ssi_protocol->device, NULL); +error2: + nokia_modem_gpio_unexport(dev); +error1: + disable_irq_wake(modem->nokia_modem_rst_ind_irq); + tasklet_kill(&modem->nokia_modem_rst_ind_tasklet); + + return err; +} + +static int nokia_modem_remove(struct device *dev) +{ + struct nokia_modem_device *modem = dev_get_drvdata(dev); + + if (!modem) + return 0; + + if (modem->ssi_protocol) { + hsi_remove_client(&modem->ssi_protocol->device, NULL); + modem->ssi_protocol = NULL; + } + + nokia_modem_gpio_unexport(dev); + dev_set_drvdata(dev, NULL); + disable_irq_wake(modem->nokia_modem_rst_ind_irq); + tasklet_kill(&modem->nokia_modem_rst_ind_tasklet); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id nokia_modem_of_match[] = { + { .compatible = "nokia,n900-modem", }, + {}, +}; +MODULE_DEVICE_TABLE(of, nokia_modem_of_match); +#endif + +static struct hsi_client_driver nokia_modem_driver = { + .driver = { + .name = "nokia-modem", + .owner = THIS_MODULE, + .probe = nokia_modem_probe, + .remove = nokia_modem_remove, + .of_match_table = of_match_ptr(nokia_modem_of_match), + }, +}; + +static int __init nokia_modem_init(void) +{ + return hsi_register_client_driver(&nokia_modem_driver); +} +module_init(nokia_modem_init); + +static void __exit nokia_modem_exit(void) +{ + hsi_unregister_client_driver(&nokia_modem_driver); +} +module_exit(nokia_modem_exit); + +MODULE_ALIAS("hsi:nokia-modem"); +MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); +MODULE_DESCRIPTION("HSI driver module for Nokia N900 Modem"); +MODULE_LICENSE("GPL"); |