1 /* 2 * OMAP1 reset support 3 */ 4 #include <linux/kernel.h> 5 #include <linux/io.h> 6 7 #include <mach/hardware.h> 8 9 #include "iomap.h" 10 #include "common.h" 11 12 /* ARM_SYSST bit shifts related to SoC reset sources */ 13 #define ARM_SYSST_POR_SHIFT 5 14 #define ARM_SYSST_EXT_RST_SHIFT 4 15 #define ARM_SYSST_ARM_WDRST_SHIFT 2 16 #define ARM_SYSST_GLOB_SWRST_SHIFT 1 17 18 /* Standardized reset source bits (across all OMAP SoCs) */ 19 #define OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT 0 20 #define OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT 1 21 #define OMAP_MPU_WD_RST_SRC_ID_SHIFT 3 22 #define OMAP_EXTWARM_RST_SRC_ID_SHIFT 5 23 24 25 void omap1_restart(char mode, const char *cmd) 26 { 27 /* 28 * Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28 29 * "Global Software Reset Affects Traffic Controller Frequency". 30 */ 31 if (cpu_is_omap5912()) { 32 omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4), DPLL_CTL); 33 omap_writew(0x8, ARM_RSTCT1); 34 } 35 36 omap_writew(1, ARM_RSTCT1); 37 } 38 39 /** 40 * omap1_get_reset_sources - return the source of the SoC's last reset 41 * 42 * Returns bits that represent the last reset source for the SoC. The 43 * format is standardized across OMAPs for use by the OMAP watchdog. 44 */ 45 u32 omap1_get_reset_sources(void) 46 { 47 u32 ret = 0; 48 u16 rs; 49 50 rs = __raw_readw(OMAP1_IO_ADDRESS(ARM_SYSST)); 51 52 if (rs & (1 << ARM_SYSST_POR_SHIFT)) 53 ret |= 1 << OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT; 54 if (rs & (1 << ARM_SYSST_EXT_RST_SHIFT)) 55 ret |= 1 << OMAP_EXTWARM_RST_SRC_ID_SHIFT; 56 if (rs & (1 << ARM_SYSST_ARM_WDRST_SHIFT)) 57 ret |= 1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT; 58 if (rs & (1 << ARM_SYSST_GLOB_SWRST_SHIFT)) 59 ret |= 1 << OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT; 60 61 return ret; 62 } 63