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https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
3169663ac5
Make the OS timer registers have IOMEM like properities so they can be passed to readl_relaxed/writel_relaxed() et.al. rather than being straight volatile dereferences. Add linux/io.h includes where required. linux/io.h includes added to arch/arm/mach-sa1100/cpu-sa1100.c, arch/arm/mach-sa1100/jornada720_ssp.c, arch/arm/mach-sa1100/leds-lart.c drivers/input/touchscreen/jornada720_ts.c, drivers/pcmcia/sa1100_shannon.c from Arnd. This fixes these warnings: arch/arm/mach-sa1100/time.c: In function 'sa1100_timer_init': arch/arm/mach-sa1100/time.c:104: warning: passing argument 1 of 'clocksource_mmio_init' discards qualifiers from pointer target type arch/arm/mach-pxa/time.c: In function 'pxa_timer_init': arch/arm/mach-pxa/time.c:126: warning: passing argument 1 of 'clocksource_mmio_init' discards qualifiers from pointer target type Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
108 lines
1.9 KiB
C
108 lines
1.9 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#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 <asm/system_misc.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;
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EXPORT_SYMBOL(reset_status);
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static void do_hw_reset(void);
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static int reset_gpio = -1;
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int init_gpio_reset(int gpio, int output, int level)
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{
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int rc;
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rc = gpio_request(gpio, "reset generator");
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if (rc) {
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printk(KERN_ERR "Can't request reset_gpio\n");
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goto out;
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}
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if (output)
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rc = gpio_direction_output(gpio, level);
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else
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rc = gpio_direction_input(gpio);
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if (rc) {
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printk(KERN_ERR "Can't configure reset_gpio\n");
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gpio_free(gpio);
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goto out;
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}
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out:
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if (!rc)
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reset_gpio = gpio;
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return rc;
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}
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/*
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* Trigger GPIO reset.
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* This covers various types of logic connecting gpio pin
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* to RESET pins (nRESET or GPIO_RESET):
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*/
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static void do_gpio_reset(void)
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{
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BUG_ON(reset_gpio == -1);
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/* drive it low */
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gpio_direction_output(reset_gpio, 0);
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mdelay(2);
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/* rising edge or drive high */
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gpio_set_value(reset_gpio, 1);
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mdelay(2);
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/* falling edge */
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gpio_set_value(reset_gpio, 0);
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/* give it some time */
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mdelay(10);
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WARN_ON(1);
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/* fallback */
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do_hw_reset();
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}
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static void do_hw_reset(void)
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{
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/* Initialize the watchdog and let it fire */
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writel_relaxed(OWER_WME, OWER);
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writel_relaxed(OSSR_M3, OSSR);
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/* ... in 100 ms */
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writel_relaxed(readl_relaxed(OSCR) + 368640, OSMR3);
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}
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void pxa_restart(char mode, const char *cmd)
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{
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local_irq_disable();
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local_fiq_disable();
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clear_reset_status(RESET_STATUS_ALL);
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switch (mode) {
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case 's':
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/* Jump into ROM at address 0 */
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soft_restart(0);
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break;
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case 'g':
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do_gpio_reset();
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break;
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case 'h':
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default:
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do_hw_reset();
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break;
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}
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}
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