diff options
author | Ben Dooks <ben-linux@fluff.org> | 2008-08-08 21:10:12 +0100 |
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committer | Ben Dooks <ben-linux@fluff.org> | 2008-08-08 21:10:12 +0100 |
commit | af7a535688a758d15f06a98833e6a143b29af9de (patch) | |
tree | bac5ab210bbbbe276f0e44ed84194d7c8bb16aae /arch/arm/mach-pxa/reset.c | |
parent | 0c17e4ceedd35c78b1c7413dbd16279a350be6bc (diff) | |
parent | c41107c2d4fd31924533f4dbc4c3428acc2b5894 (diff) |
Merge http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm into for-rmk
Diffstat (limited to 'arch/arm/mach-pxa/reset.c')
-rw-r--r-- | arch/arm/mach-pxa/reset.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/reset.c b/arch/arm/mach-pxa/reset.c new file mode 100644 index 00000000000..9996c612c3d --- /dev/null +++ b/arch/arm/mach-pxa/reset.c @@ -0,0 +1,98 @@ +/* + * 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 <linux/kernel.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/gpio.h> +#include <asm/io.h> +#include <asm/proc-fns.h> + +#include <mach/pxa-regs.h> +#include <mach/reset.h> + +unsigned int reset_status; +EXPORT_SYMBOL(reset_status); + +static void do_hw_reset(void); + +static int reset_gpio = -1; + +int init_gpio_reset(int gpio) +{ + int rc; + + rc = gpio_request(gpio, "reset generator"); + if (rc) { + printk(KERN_ERR "Can't request reset_gpio\n"); + goto out; + } + + rc = gpio_direction_input(gpio); + if (rc) { + printk(KERN_ERR "Can't configure reset_gpio for input\n"); + gpio_free(gpio); + goto out; + } + +out: + if (!rc) + reset_gpio = gpio; + + return rc; +} + +/* + * Trigger GPIO reset. + * This covers various types of logic connecting gpio pin + * to RESET pins (nRESET or GPIO_RESET): + */ +static void do_gpio_reset(void) +{ + BUG_ON(reset_gpio == -1); + + /* drive it low */ + gpio_direction_output(reset_gpio, 0); + mdelay(2); + /* rising edge or drive high */ + gpio_set_value(reset_gpio, 1); + mdelay(2); + /* falling edge */ + gpio_set_value(reset_gpio, 0); + + /* give it some time */ + mdelay(10); + + WARN_ON(1); + /* fallback */ + do_hw_reset(); +} + +static void do_hw_reset(void) +{ + /* Initialize the watchdog and let it fire */ + OWER = OWER_WME; + OSSR = OSSR_M3; + OSMR3 = OSCR + 368640; /* ... in 100 ms */ +} + +void arch_reset(char mode) +{ + clear_reset_status(RESET_STATUS_ALL); + + switch (mode) { + case 's': + /* Jump into ROM at address 0 */ + cpu_reset(0); + break; + case 'h': + do_hw_reset(); + break; + case 'g': + do_gpio_reset(); + break; + } +} + |