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64 lines
1.7 KiB
64 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* OMAP1 reset support |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/io.h> |
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#include <linux/reboot.h> |
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#include <mach/hardware.h> |
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#include "iomap.h" |
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#include "common.h" |
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/* ARM_SYSST bit shifts related to SoC reset sources */ |
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#define ARM_SYSST_POR_SHIFT 5 |
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#define ARM_SYSST_EXT_RST_SHIFT 4 |
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#define ARM_SYSST_ARM_WDRST_SHIFT 2 |
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#define ARM_SYSST_GLOB_SWRST_SHIFT 1 |
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/* Standardized reset source bits (across all OMAP SoCs) */ |
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#define OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT 0 |
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#define OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT 1 |
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#define OMAP_MPU_WD_RST_SRC_ID_SHIFT 3 |
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#define OMAP_EXTWARM_RST_SRC_ID_SHIFT 5 |
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void omap1_restart(enum reboot_mode mode, const char *cmd) |
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{ |
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/* |
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* Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28 |
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* "Global Software Reset Affects Traffic Controller Frequency". |
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*/ |
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if (cpu_is_omap5912()) { |
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omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4), DPLL_CTL); |
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omap_writew(0x8, ARM_RSTCT1); |
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} |
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omap_writew(1, ARM_RSTCT1); |
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} |
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/** |
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* omap1_get_reset_sources - return the source of the SoC's last reset |
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* |
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* Returns bits that represent the last reset source for the SoC. The |
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* format is standardized across OMAPs for use by the OMAP watchdog. |
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*/ |
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u32 omap1_get_reset_sources(void) |
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{ |
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u32 ret = 0; |
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u16 rs; |
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rs = __raw_readw(OMAP1_IO_ADDRESS(ARM_SYSST)); |
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if (rs & (1 << ARM_SYSST_POR_SHIFT)) |
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ret |= 1 << OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT; |
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if (rs & (1 << ARM_SYSST_EXT_RST_SHIFT)) |
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ret |= 1 << OMAP_EXTWARM_RST_SRC_ID_SHIFT; |
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if (rs & (1 << ARM_SYSST_ARM_WDRST_SHIFT)) |
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ret |= 1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT; |
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if (rs & (1 << ARM_SYSST_GLOB_SWRST_SHIFT)) |
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ret |= 1 << OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT; |
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return ret; |
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}
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