cmd: ti: pd: Add debug command for K3 power domains

Add support command for debugging K3 power domains. This is useful with
the HSM rearch setup, where power domains are directly controlled by SPL
instead of going through the TI SCI layer. The debugging support is only
available in the u-boot codebase though, so the raw register access
power domain layer must be enabled on u-boot side for this to work. By
default, u-boot side uses the TI SCI layer, and R5 SPL only uses the
direct access methods.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tero Kristo <kristo@kernel.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

3 files changed, 194 insertions, 0 deletions

diff --git a/cmd/ti/Kconfig b/cmd/ti/Kconfig
index efeff0d482..db557445a8 100644
--- a/cmd/ti/Kconfig
+++ b/cmd/ti/Kconfig
@@ -7,4 +7,12 @@ config CMD_DDR3
 	   supports memory verification, memory comapre and ecc
 	   verification if supported.
 
+config CMD_PD
+	bool "command for verifying power domains"
+	depends on TI_POWER_DOMAIN
+	help
+	   Debug command for K3 power domains. For this to work, the
+	   K3 power domain driver must be enabled for the u-boot; by
+	   default it is only enabled for SPL.
+
 endmenu
diff --git a/cmd/ti/Makefile b/cmd/ti/Makefile
index 16fbade9ed..045593396b 100644
--- a/cmd/ti/Makefile
+++ b/cmd/ti/Makefile
@@ -5,4 +5,5 @@ obj- += dummy.o
 
 ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_CMD_DDR3) += ddr3.o
+obj-$(CONFIG_CMD_PD) += pd.o
 endif
diff --git a/cmd/ti/pd.c b/cmd/ti/pd.c
new file mode 100644
index 0000000000..9e820b84ca
--- /dev/null
+++ b/cmd/ti/pd.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Power Domain test commands
+ *
+ * Copyright (C) 2020 Texas Instruments Incorporated, <www.ti.com>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <k3-dev.h>
+
+static const struct udevice_id ti_pd_of_match[] = {
+	{ .compatible = "ti,sci-pm-domain" },
+	{ /* sentinel */ }
+};
+
+static struct ti_k3_pd_platdata *ti_pd_find_data(void)
+{
+	struct udevice *dev;
+	int i = 0;
+
+	while (1) {
+		uclass_get_device(UCLASS_POWER_DOMAIN, i++, &dev);
+		if (!dev)
+			return NULL;
+
+		if (device_is_compatible(dev,
+					 ti_pd_of_match[0].compatible))
+			return  dev_get_priv(dev);
+	}
+
+	return NULL;
+}
+
+static void dump_lpsc(struct ti_k3_pd_platdata *data, struct ti_pd *pd)
+{
+	int i;
+	struct ti_lpsc *lpsc;
+	u8 state;
+	static const char * const lpsc_states[] = {
+		"swrstdis", "syncrst", "disable", "enable", "autosleep",
+		"autowake", "unknown",
+	};
+
+	for (i = 0; i < data->num_lpsc; i++) {
+		lpsc = &data->lpsc[i];
+		if (lpsc->pd != pd)
+			continue;
+		state = lpsc_get_state(lpsc);
+		if (state > ARRAY_SIZE(lpsc_states))
+			state = ARRAY_SIZE(lpsc_states) - 1;
+		printf("    LPSC%d: state=%s, usecount=%d\n",
+		       lpsc->id, lpsc_states[state], lpsc->usecount);
+	}
+}
+
+static void dump_pd(struct ti_k3_pd_platdata *data, struct ti_psc *psc)
+{
+	int i;
+	struct ti_pd *pd;
+	u8 state;
+	static const char * const pd_states[] = {
+		"off", "on", "unknown"
+	};
+
+	for (i = 0; i < data->num_pd; i++) {
+		pd = &data->pd[i];
+		if (pd->psc != psc)
+			continue;
+		state = ti_pd_state(pd);
+		if (state > ARRAY_SIZE(pd_states))
+			state = ARRAY_SIZE(pd_states) - 1;
+		printf("  PD%d: state=%s, usecount=%d:\n",
+		       pd->id, pd_states[state], pd->usecount);
+		dump_lpsc(data, pd);
+	}
+}
+
+static void dump_psc(struct ti_k3_pd_platdata *data)
+{
+	int i;
+	struct ti_psc *psc;
+
+	for (i = 0; i < data->num_psc; i++) {
+		psc = &data->psc[i];
+		printf("PSC%d [%p]:\n", psc->id, psc->base);
+		dump_pd(data, psc);
+	}
+}
+
+static int do_pd_dump(struct cmd_tbl *cmdtp, int flag, int argc,
+		      char *const argv[])
+{
+	struct ti_k3_pd_platdata *data;
+
+	data = ti_pd_find_data();
+	if (!data)
+		return CMD_RET_FAILURE;
+
+	dump_psc(data);
+
+	return 0;
+}
+
+static int do_pd_endis(int argc, char *const argv[], u8 state)
+{
+	u32 psc_id;
+	u32 lpsc_id;
+	int i;
+	struct ti_k3_pd_platdata *data;
+	struct ti_lpsc *lpsc;
+	int ret;
+
+	if (argc < 3)
+		return CMD_RET_FAILURE;
+
+	data = ti_pd_find_data();
+	if (!data)
+		return CMD_RET_FAILURE;
+
+	psc_id = simple_strtoul(argv[1], NULL, 10);
+	lpsc_id = simple_strtoul(argv[2], NULL, 10);
+
+	for (i = 0; i < data->num_lpsc; i++) {
+		lpsc = &data->lpsc[i];
+		if (lpsc->pd->psc->id != psc_id)
+			continue;
+		if (lpsc->id != lpsc_id)
+			continue;
+		printf("%s pd [PSC:%d,LPSC:%d]...\n",
+		       state == MDSTAT_STATE_ENABLE ? "Enabling" : "Disabling",
+		       psc_id, lpsc_id);
+		ret = ti_lpsc_transition(lpsc, state);
+		if (ret)
+			return CMD_RET_FAILURE;
+		else
+			return 0;
+	}
+
+	printf("No matching psc/lpsc found.\n");
+
+	return CMD_RET_FAILURE;
+}
+
+static int do_pd_enable(struct cmd_tbl *cmdtp, int flag, int argc,
+			char *const argv[])
+{
+	return do_pd_endis(argc, argv, MDSTAT_STATE_ENABLE);
+}
+
+static int do_pd_disable(struct cmd_tbl *cmdtp, int flag, int argc,
+			 char *const argv[])
+{
+	return do_pd_endis(argc, argv, MDSTAT_STATE_SWRSTDISABLE);
+}
+
+static struct cmd_tbl cmd_pd[] = {
+	U_BOOT_CMD_MKENT(dump, 1, 0, do_pd_dump, "", ""),
+	U_BOOT_CMD_MKENT(enable, 3, 0, do_pd_enable, "", ""),
+	U_BOOT_CMD_MKENT(disable, 3, 0, do_pd_disable, "", ""),
+};
+
+static int ti_do_pd(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct cmd_tbl *c;
+
+	argc--;
+	argv++;
+
+	c = find_cmd_tbl(argv[0], cmd_pd, ARRAY_SIZE(cmd_pd));
+	if (c)
+		return c->cmd(cmdtp, flag, argc, argv);
+	else
+		return CMD_RET_USAGE;
+}
+
+U_BOOT_CMD(pd, 4, 1, ti_do_pd,
+	   "TI power domain control",
+#if CONFIG_IS_ENABLED(SYS_LONGHELP)
+	   "dump                 - show power domain status\n"
+	   "enable [psc] [lpsc]  - enable power domain\n"
+	   "disable [psc] [lpsc] - disable power domain\n"
+#endif
+);