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arch/arm/mach-pxa/reset.c
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/* * 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> |
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#include <linux/io.h> |
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#include <asm/proc-fns.h> |
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#include <mach/regs-ost.h> |
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#include <mach/reset.h> |
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unsigned int reset_status; EXPORT_SYMBOL(reset_status); |
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static void do_hw_reset(void); static int reset_gpio = -1; |
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int init_gpio_reset(int gpio, int output, int level) |
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{ int rc; rc = gpio_request(gpio, "reset generator"); if (rc) { printk(KERN_ERR "Can't request reset_gpio "); goto out; } |
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if (output) |
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rc = gpio_direction_output(gpio, level); |
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else rc = gpio_direction_input(gpio); |
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if (rc) { |
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printk(KERN_ERR "Can't configure reset_gpio "); |
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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 */ } |
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void pxa_restart(char mode, const char *cmd) |
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{ |
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local_irq_disable(); local_fiq_disable(); |
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clear_reset_status(RESET_STATUS_ALL); |
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switch (mode) { case 's': /* Jump into ROM at address 0 */ |
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soft_restart(0); |
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break; |
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case 'g': do_gpio_reset(); break; |
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case 'h': default: do_hw_reset(); break; |
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} } |