Commit | Line | Data |
---|---|---|
ee54dba9 RKAL |
1 | /* |
2 | * OMAP1 reset support | |
3 | */ | |
4 | #include <linux/kernel.h> | |
5 | #include <linux/io.h> | |
7b6d864b | 6 | #include <linux/reboot.h> |
ee54dba9 | 7 | |
2e3ee9f4 TL |
8 | #include <mach/hardware.h> |
9 | ||
508c0d47 | 10 | #include "iomap.h" |
e2ed89fc PW |
11 | #include "common.h" |
12 | ||
b5c5353d PW |
13 | /* ARM_SYSST bit shifts related to SoC reset sources */ |
14 | #define ARM_SYSST_POR_SHIFT 5 | |
15 | #define ARM_SYSST_EXT_RST_SHIFT 4 | |
16 | #define ARM_SYSST_ARM_WDRST_SHIFT 2 | |
17 | #define ARM_SYSST_GLOB_SWRST_SHIFT 1 | |
18 | ||
19 | /* Standardized reset source bits (across all OMAP SoCs) */ | |
20 | #define OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT 0 | |
21 | #define OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT 1 | |
22 | #define OMAP_MPU_WD_RST_SRC_ID_SHIFT 3 | |
23 | #define OMAP_EXTWARM_RST_SRC_ID_SHIFT 5 | |
24 | ||
25 | ||
7b6d864b | 26 | void omap1_restart(enum reboot_mode mode, const char *cmd) |
ee54dba9 RKAL |
27 | { |
28 | /* | |
29 | * Workaround for 5912/1611b bug mentioned in sprz209d.pdf p. 28 | |
30 | * "Global Software Reset Affects Traffic Controller Frequency". | |
31 | */ | |
32 | if (cpu_is_omap5912()) { | |
33 | omap_writew(omap_readw(DPLL_CTL) & ~(1 << 4), DPLL_CTL); | |
34 | omap_writew(0x8, ARM_RSTCT1); | |
35 | } | |
36 | ||
37 | omap_writew(1, ARM_RSTCT1); | |
38 | } | |
b5c5353d PW |
39 | |
40 | /** | |
41 | * omap1_get_reset_sources - return the source of the SoC's last reset | |
42 | * | |
43 | * Returns bits that represent the last reset source for the SoC. The | |
44 | * format is standardized across OMAPs for use by the OMAP watchdog. | |
45 | */ | |
508c0d47 | 46 | u32 omap1_get_reset_sources(void) |
b5c5353d | 47 | { |
508c0d47 | 48 | u32 ret = 0; |
b5c5353d PW |
49 | u16 rs; |
50 | ||
508c0d47 | 51 | rs = __raw_readw(OMAP1_IO_ADDRESS(ARM_SYSST)); |
b5c5353d PW |
52 | |
53 | if (rs & (1 << ARM_SYSST_POR_SHIFT)) | |
54 | ret |= 1 << OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT; | |
55 | if (rs & (1 << ARM_SYSST_EXT_RST_SHIFT)) | |
56 | ret |= 1 << OMAP_EXTWARM_RST_SRC_ID_SHIFT; | |
57 | if (rs & (1 << ARM_SYSST_ARM_WDRST_SHIFT)) | |
58 | ret |= 1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT; | |
59 | if (rs & (1 << ARM_SYSST_GLOB_SWRST_SHIFT)) | |
60 | ret |= 1 << OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT; | |
61 | ||
62 | return ret; | |
63 | } |