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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-13 10:59:11 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-13 10:59:11 -0800 |
commit | 698d601224824bc1a5bf17f3d86be902e2aabff0 (patch) | |
tree | 10262bd1f83fd26f874cbd898818e5925844a2ef /arch/arm/mach-vexpress | |
parent | a11da7df6543b5f71a150b47c0d08ecf0799a0f3 (diff) | |
parent | 4aa7cf79b1f760b5751d1686329351c2e060791b (diff) | |
download | linux-698d601224824bc1a5bf17f3d86be902e2aabff0.tar.bz2 |
Merge tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC driver specific changes from Olof Johansson:
"A collection of mostly SoC-specific driver updates:
- a handful of pincontrol and setup changes
- new drivers for hwmon and reset controller for vexpress
- timing support updates for OMAP (gpmc and other interfaces)
- plus a collection of smaller cleanups"
* tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (21 commits)
ARM: ux500: fix pin warning
ARM: OMAP2+: tusb6010: generic timing calculation
ARM: OMAP2+: smc91x: generic timing calculation
ARM: OMAP2+: onenand: generic timing calculation
ARM: OMAP2+: gpmc: generic timing calculation
ARM: OMAP2+: gpmc: handle additional timings
ARM: OMAP2+: nand: remove redundant rounding
gpio: samsung: use pr_* instead of printk
ARM: ux500: fixup magnetometer pins
ARM: ux500: add STM pin configuration
ARM: ux500: 8500: add pinctrl support for uart1 and uart2
ARM: ux500: cosmetic fixups for uart0
gpio: samsung: Fix input mode setting function for GPIO int
ARM: SAMSUNG: Insert bitmap_gpio_int member in samsung_gpio_chip
ARM: ux500: 8500: define SDI sleep states
ARM: vexpress: Reset driver
ARM: ux500: 8500: update SKE keypad pinctrl table
hwmon: Versatile Express hwmon driver
ARM: ux500: delete duplicate macro
ARM: ux500: 8500: add IDLE pin configuration for SPI
...
Diffstat (limited to 'arch/arm/mach-vexpress')
-rw-r--r-- | arch/arm/mach-vexpress/reset.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/arch/arm/mach-vexpress/reset.c b/arch/arm/mach-vexpress/reset.c new file mode 100644 index 000000000000..465923aa3819 --- /dev/null +++ b/arch/arm/mach-vexpress/reset.c @@ -0,0 +1,141 @@ +/* + * 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. + * + * Copyright (C) 2012 ARM Limited + */ + +#include <linux/jiffies.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/stat.h> +#include <linux/vexpress.h> + +static void vexpress_reset_do(struct device *dev, const char *what) +{ + int err = -ENOENT; + struct vexpress_config_func *func = + vexpress_config_func_get_by_dev(dev); + + if (func) { + unsigned long timeout; + + err = vexpress_config_write(func, 0, 0); + + timeout = jiffies + HZ; + while (time_before(jiffies, timeout)) + cpu_relax(); + } + + dev_emerg(dev, "Unable to %s (%d)\n", what, err); +} + +static struct device *vexpress_power_off_device; + +void vexpress_power_off(void) +{ + vexpress_reset_do(vexpress_power_off_device, "power off"); +} + +static struct device *vexpress_restart_device; + +void vexpress_restart(char str, const char *cmd) +{ + vexpress_reset_do(vexpress_restart_device, "restart"); +} + +static ssize_t vexpress_reset_active_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", vexpress_restart_device == dev); +} + +static ssize_t vexpress_reset_active_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + long value; + int err = kstrtol(buf, 0, &value); + + if (!err && value) + vexpress_restart_device = dev; + + return err ? err : count; +} + +DEVICE_ATTR(active, S_IRUGO | S_IWUSR, vexpress_reset_active_show, + vexpress_reset_active_store); + + +enum vexpress_reset_func { FUNC_RESET, FUNC_SHUTDOWN, FUNC_REBOOT }; + +static struct of_device_id vexpress_reset_of_match[] = { + { + .compatible = "arm,vexpress-reset", + .data = (void *)FUNC_RESET, + }, { + .compatible = "arm,vexpress-shutdown", + .data = (void *)FUNC_SHUTDOWN + }, { + .compatible = "arm,vexpress-reboot", + .data = (void *)FUNC_REBOOT + }, + {} +}; + +static int vexpress_reset_probe(struct platform_device *pdev) +{ + enum vexpress_reset_func func; + const struct of_device_id *match = + of_match_device(vexpress_reset_of_match, &pdev->dev); + + if (match) + func = (enum vexpress_reset_func)match->data; + else + func = pdev->id_entry->driver_data; + + switch (func) { + case FUNC_SHUTDOWN: + vexpress_power_off_device = &pdev->dev; + break; + case FUNC_RESET: + if (!vexpress_restart_device) + vexpress_restart_device = &pdev->dev; + device_create_file(&pdev->dev, &dev_attr_active); + break; + case FUNC_REBOOT: + vexpress_restart_device = &pdev->dev; + device_create_file(&pdev->dev, &dev_attr_active); + break; + }; + + return 0; +} + +static const struct platform_device_id vexpress_reset_id_table[] = { + { .name = "vexpress-reset", .driver_data = FUNC_RESET, }, + { .name = "vexpress-shutdown", .driver_data = FUNC_SHUTDOWN, }, + { .name = "vexpress-reboot", .driver_data = FUNC_REBOOT, }, + {} +}; + +static struct platform_driver vexpress_reset_driver = { + .probe = vexpress_reset_probe, + .driver = { + .name = "vexpress-reset", + .of_match_table = vexpress_reset_of_match, + }, + .id_table = vexpress_reset_id_table, +}; + +static int __init vexpress_reset_init(void) +{ + return platform_driver_register(&vexpress_reset_driver); +} +device_initcall(vexpress_reset_init); |