Release 4.11 arch/arm/mach-omap1/reset.c

/*
 * OMAP1 reset support
 */
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/reboot.h>

#include <mach/hardware.h>

#include "iomap.h"
#include "common.h"

/* ARM_SYSST bit shifts related to SoC reset sources */

#define ARM_SYSST_POR_SHIFT				5

#define ARM_SYSST_EXT_RST_SHIFT				4

#define ARM_SYSST_ARM_WDRST_SHIFT			2

#define ARM_SYSST_GLOB_SWRST_SHIFT			1

/* Standardized reset source bits (across all OMAP SoCs) */

#define OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT		0

#define OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT		1

#define OMAP_MPU_WD_RST_SRC_ID_SHIFT			3

#define OMAP_EXTWARM_RST_SRC_ID_SHIFT			5




void omap1_restart(enum reboot_mode mode, const char *cmd)
{
	/*
         * Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28
         * "Global Software Reset Affects Traffic Controller Frequency".
         */
	if (cpu_is_omap5912()) {
		omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4), DPLL_CTL);
		omap_writew(0x8, ARM_RSTCT1);
	}

	omap_writew(1, ARM_RSTCT1);
}

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/**
 * omap1_get_reset_sources - return the source of the SoC's last reset
 *
 * Returns bits that represent the last reset source for the SoC.  The
 * format is standardized across OMAPs for use by the OMAP watchdog.
 */


u32 omap1_get_reset_sources(void)
{
	u32 ret = 0;
	u16 rs;

	rs = __raw_readw(OMAP1_IO_ADDRESS(ARM_SYSST));

	if (rs & (1 << ARM_SYSST_POR_SHIFT))
		ret |= 1 << OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT;
	if (rs & (1 << ARM_SYSST_EXT_RST_SHIFT))
		ret |= 1 << OMAP_EXTWARM_RST_SRC_ID_SHIFT;
	if (rs & (1 << ARM_SYSST_ARM_WDRST_SHIFT))
		ret |= 1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT;
	if (rs & (1 << ARM_SYSST_GLOB_SWRST_SHIFT))
		ret |= 1 << OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT;

	return ret;
}
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Directory: arch/arm/mach-omap1

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