Add the capability to detect a resume. To detect the resume, SPL searches a magic value (0xBA) in a register of PMICA. This value is set by DM-Firmware during the suspend sequence.
Based on the work of Gregory CLEMENT gregory.clement@bootlin.com
Signed-off-by: Thomas Richard thomas.richard@bootlin.com Signed-off-by: Gregory CLEMENT gregory.clement@bootlin.com
---
Changes in v3: - Remove if statement for pmic.h
board/ti/j721e/evm.c | 52 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+)
diff --git a/board/ti/j721e/evm.c b/board/ti/j721e/evm.c index 38fe447d8f..c5404c014d 100644 --- a/board/ti/j721e/evm.c +++ b/board/ti/j721e/evm.c @@ -22,6 +22,7 @@ #include <spl.h> #include <dm.h> #include <dm/uclass-internal.h> +#include <power/pmic.h>
#include "../common/board_detect.h"
@@ -528,6 +529,57 @@ err_free_gpio: } }
+#if (IS_ENABLED(CONFIG_SPL_BUILD) && IS_ENABLED(CONFIG_TARGET_J7200_R5_EVM)) + +#define SCRATCH_PAD_REG_3 0xCB + +#define MAGIC_SUSPEND 0xBA + +static int resuming = -1; + +int board_is_resuming(void) +{ + struct udevice *pmica, *pmicb; + int ret; + + if (resuming >= 0) + goto end; + + ret = uclass_get_device_by_name(UCLASS_PMIC, + "tps659413@48", &pmica); + if (ret) { + printf("Getting PMICA init failed: %d\n", ret); + resuming = 0; + goto end; + } + debug("%s: PMICA is detected (%s)\n", __func__, pmica->name); + + ret = uclass_get_device_by_name(UCLASS_PMIC, + "lp876441@4c", &pmicb); + if (ret) { + printf("Getting PMICB init failed: %d\n", ret); + resuming = 0; + goto end; + } + debug("%s: PMICB is detected (%s)\n", __func__, pmicb->name); + + if ((pmic_reg_read(pmica, SCRATCH_PAD_REG_3) == MAGIC_SUSPEND)) { + resuming = 1; + debug("%s: board is resuming\n", __func__); + + /* clean magic suspend */ + if (pmic_reg_write(pmica, SCRATCH_PAD_REG_3, 0)) + printf("Failed to clean magic value for suspend detection in PMICA\n"); + } else { + resuming = 0; + debug("%s: board is booting (no resume detected)\n", __func__); + } +end: + return resuming; +} + +#endif /* CONFIG_SPL_BUILD && CONFIG_TARGET_J7200_R5_EVM */ + void spl_board_init(void) { #if defined(CONFIG_ESM_K3) || defined(CONFIG_ESM_PMIC)