[PATCHv6 14/26] power: domain: Introduce driver for raw TI K3 PDs

Tero Kristo
2021-06-11T08:48:22Z

Normally, power domains are handled via TI-SCI in K3 SoCs. However,
SPL is not going to have access to sysfw resources, so it must control
them directly. Add driver for supporting this.

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>
---
drivers/power/domain/Kconfig | 7 +
drivers/power/domain/Makefile | 1 +
drivers/power/domain/ti-power-domain.c | 368 +++++++++++++++++++++++++
include/k3-dev.h | 76 +++++
4 files changed, 452 insertions(+)
create mode 100644 drivers/power/domain/ti-power-domain.c
create mode 100644 include/k3-dev.h

diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index a0fd980752..99b3f9ae71 100644
--- a/drivers/power/domain/Kconfig
+++ b/drivers/power/domain/Kconfig
@@ -72,4 +72,11 @@ config TI_SCI_POWER_DOMAIN
help
Generic power domain implementation for TI devices implementing the
TI SCI protocol.
+
+config TI_POWER_DOMAIN
+ bool "Enable the TI K3 Power domain driver"
+ depends on POWER_DOMAIN && ARCH_K3
+ help
+ Generic power domain implementation for TI K3 devices.
+
endmenu
diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile
index 45bf9f6383..3d1e5f073c 100644
--- a/drivers/power/domain/Makefile
+++ b/drivers/power/domain/Makefile
@@ -14,3 +14,4 @@ obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o
obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o
obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o
obj-$(CONFIG_TI_SCI_POWER_DOMAIN) += ti-sci-power-domain.o
+obj-$(CONFIG_TI_POWER_DOMAIN) += ti-power-domain.o
diff --git a/drivers/power/domain/ti-power-domain.c b/drivers/power/domain/ti-power-domain.c
new file mode 100644
index 0000000000..56bc6fc31c
--- /dev/null
+++ b/drivers/power/domain/ti-power-domain.c
@@ -0,0 +1,368 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments power domain driver
+ *
+ * Copyright (C) 2020-2021 Texas Instruments Incorporated - http://www.ti.com/
+ * Tero Kristo <t-kristo@ti.com>
+ */
+
+#include <asm/io.h>
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <power-domain-uclass.h>
+#include <soc.h>
+#include <k3-dev.h>
+#include <linux/iopoll.h>
+
+#define PSC_PTCMD 0x120
+#define PSC_PTSTAT 0x128
+#define PSC_PDSTAT 0x200
+#define PSC_PDCTL 0x300
+#define PSC_MDSTAT 0x800
+#define PSC_MDCTL 0xa00
+
+#define PDCTL_STATE_MASK 0x1
+#define PDCTL_STATE_OFF 0x0
+#define PDCTL_STATE_ON 0x1
+
+#define MDSTAT_STATE_MASK 0x3f
+#define MDSTAT_BUSY_MASK 0x30
+#define MDSTAT_STATE_SWRSTDISABLE 0x0
+#define MDSTAT_STATE_ENABLE 0x3
+
+#define LPSC_TIMEOUT 1000
+#define PD_TIMEOUT 1000
+
+static u32 psc_read(struct ti_psc *psc, u32 reg)
+{
+ u32 val;
+
+ val = readl(psc->base + reg);
+ debug("%s: 0x%x from %p\n", __func__, val, psc->base + reg);
+ return val;
+}
+
+static void psc_write(u32 val, struct ti_psc *psc, u32 reg)
+{
+ debug("%s: 0x%x to %p\n", __func__, val, psc->base + reg);
+ writel(val, psc->base + reg);
+}
+
+static u32 pd_read(struct ti_pd *pd, u32 reg)
+{
+ return psc_read(pd->psc, reg + 4 * pd->id);
+}
+
+static void pd_write(u32 val, struct ti_pd *pd, u32 reg)
+{
+ psc_write(val, pd->psc, reg + 4 * pd->id);
+}
+
+static u32 lpsc_read(struct ti_lpsc *lpsc, u32 reg)
+{
+ return psc_read(lpsc->psc, reg + 4 * lpsc->id);
+}
+
+static void lpsc_write(u32 val, struct ti_lpsc *lpsc, u32 reg)
+{
+ psc_write(val, lpsc->psc, reg + 4 * lpsc->id);
+}
+
+static const struct soc_attr ti_k3_soc_pd_data[] = {
+#if IS_ENABLED(CONFIG_SOC_K3_J721E)
+ {
+ .family = "J721E",
+ .data = &j721e_pd_platdata,
+ },
+ {
+ .family = "J7200",
+ .data = &j7200_pd_platdata,
+ },
+#endif
+ { /* sentinel */ }
+};
+
+static int ti_power_domain_probe(struct udevice *dev)
+{
+ struct ti_k3_pd_platdata *data = dev_get_priv(dev);
+ const struct soc_attr *soc_match_data;
+ const struct ti_k3_pd_platdata *pdata;
+
+ printf("%s(dev=%p)\n", __func__, dev);
+
+ if (!data)
+ return -ENOMEM;
+
+ soc_match_data = soc_device_match(ti_k3_soc_pd_data);
+ if (!soc_match_data)
+ return -ENODEV;
+
+ pdata = (const struct ti_k3_pd_platdata *)soc_match_data->data;
+
+ data->psc = pdata->psc;
+ data->pd = pdata->pd;
+ data->lpsc = pdata->lpsc;
+ data->devs = pdata->devs;
+ data->num_psc = pdata->num_psc;
+ data->num_pd = pdata->num_pd;
+ data->num_lpsc = pdata->num_lpsc;
+ data->num_devs = pdata->num_devs;
+
+ return 0;
+}
+
+static int ti_pd_wait(struct ti_pd *pd)
+{
+ u32 ptstat;
+ int ret;
+
+ ret = readl_poll_timeout(pd->psc->base + PSC_PTSTAT, ptstat,
+ !(ptstat & BIT(pd->id)), PD_TIMEOUT);
+
+ if (ret)
+ printf("%s: psc%d, pd%d failed to transition.\n", __func__,
+ pd->psc->id, pd->id);
+
+ return ret;
+}
+
+static void ti_pd_transition(struct ti_pd *pd)
+{
+ psc_write(BIT(pd->id), pd->psc, PSC_PTCMD);
+}
+
+static u8 ti_pd_state(struct ti_pd *pd)
+{
+ return pd_read(pd, PSC_PDCTL) & PDCTL_STATE_MASK;
+}
+
+static int ti_pd_get(struct ti_pd *pd)
+{
+ u32 pdctl;
+ int ret;
+
+ pd->usecount++;
+
+ if (pd->usecount > 1)
+ return 0;
+
+ if (pd->depend) {
+ ret = ti_pd_get(pd->depend);
+ if (ret)
+ return ret;
+ ti_pd_transition(pd->depend);
+ ret = ti_pd_wait(pd->depend);
+ if (ret)
+ return ret;
+ }
+
+ pdctl = pd_read(pd, PSC_PDCTL);
+
+ if ((pdctl & PDCTL_STATE_MASK) == PDCTL_STATE_ON)
+ return 0;
+
+ debug("%s: enabling psc:%d, pd:%d\n", __func__, pd->psc->id, pd->id);
+
+ pdctl &= ~PDCTL_STATE_MASK;
+ pdctl |= PDCTL_STATE_ON;
+
+ pd_write(pdctl, pd, PSC_PDCTL);
+
+ return 0;
+}
+
+static int ti_pd_put(struct ti_pd *pd)
+{
+ u32 pdctl;
+ int ret;
+
+ pd->usecount--;
+
+ if (pd->usecount > 0)
+ return 0;
+
+ pdctl = pd_read(pd, PSC_PDCTL);
+ if ((pdctl & PDCTL_STATE_MASK) == PDCTL_STATE_OFF)
+ return 0;
+
+ pdctl &= ~PDCTL_STATE_MASK;
+ pdctl |= PDCTL_STATE_OFF;
+
+ debug("%s: disabling psc:%d, pd:%d\n", __func__, pd->psc->id, pd->id);
+
+ pd_write(pdctl, pd, PSC_PDCTL);
+
+ if (pd->depend) {
+ ti_pd_transition(pd);
+ ret = ti_pd_wait(pd);
+ if (ret)
+ return ret;
+
+ ret = ti_pd_put(pd->depend);
+ if (ret)
+ return ret;
+ ti_pd_transition(pd->depend);
+ ret = ti_pd_wait(pd->depend);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ti_lpsc_wait(struct ti_lpsc *lpsc)
+{
+ u32 mdstat;
+ int ret;
+
+ ret = readl_poll_timeout(lpsc->psc->base + PSC_MDSTAT + lpsc->id * 4,
+ mdstat,
+ !(mdstat & MDSTAT_BUSY_MASK), LPSC_TIMEOUT);
+
+ if (ret)
+ printf("%s: module %d failed to transition.\n", __func__,
+ lpsc->id);
+
+ return ret;
+}
+
+static u8 lpsc_get_state(struct ti_lpsc *lpsc)
+{
+ return lpsc_read(lpsc, PSC_MDCTL) & MDSTAT_STATE_MASK;
+}
+
+static int ti_lpsc_transition(struct ti_lpsc *lpsc, u8 state)
+{
+ struct ti_pd *psc_pd;
+ int ret;
+ u32 mdctl;
+
+ psc_pd = lpsc->pd;
+
+ if (state == MDSTAT_STATE_ENABLE) {
+ lpsc->usecount++;
+ if (lpsc->usecount > 1)
+ return 0;
+ } else {
+ lpsc->usecount--;
+ if (lpsc->usecount >= 1)
+ return 0;
+ }
+
+ debug("%s: transitioning psc:%d, lpsc:%d to %x\n", __func__,
+ lpsc->psc->id, lpsc->id, state);
+
+ if (lpsc->depend)
+ ti_lpsc_transition(lpsc->depend, state);
+
+ mdctl = lpsc_read(lpsc, PSC_MDCTL);
+ if ((mdctl & MDSTAT_STATE_MASK) == state)
+ return 0;
+
+ if (state == MDSTAT_STATE_ENABLE)
+ ti_pd_get(psc_pd);
+ else
+ ti_pd_put(psc_pd);
+
+ mdctl &= ~MDSTAT_STATE_MASK;
+ mdctl |= state;
+
+ lpsc_write(mdctl, lpsc, PSC_MDCTL);
+
+ ti_pd_transition(psc_pd);
+ ret = ti_pd_wait(psc_pd);
+ if (ret)
+ return ret;
+
+ return ti_lpsc_wait(lpsc);
+}
+
+static int ti_power_domain_transition(struct power_domain *pd, u8 state)
+{
+ struct ti_lpsc *lpsc = pd->priv;
+
+ return ti_lpsc_transition(lpsc, state);
+}
+
+static int ti_power_domain_on(struct power_domain *pd)
+{
+ debug("%s(pd=%p, id=%lu)\n", __func__, pd, pd->id);
+
+ return ti_power_domain_transition(pd, MDSTAT_STATE_ENABLE);
+}
+
+static int ti_power_domain_off(struct power_domain *pd)
+{
+ debug("%s(pd=%p, id=%lu)\n", __func__, pd, pd->id);
+
+ return ti_power_domain_transition(pd, MDSTAT_STATE_SWRSTDISABLE);
+}
+
+static struct ti_lpsc *lpsc_lookup(struct ti_k3_pd_platdata *data, int id)
+{
+ int idx;
+
+ for (idx = 0; idx < data->num_devs; idx++)
+ if (data->devs[idx].id == id)
+ return data->devs[idx].lpsc;
+
+ return NULL;
+}
+
+static int ti_power_domain_of_xlate(struct power_domain *pd,
+ struct ofnode_phandle_args *args)
+{
+ struct ti_k3_pd_platdata *data = dev_get_priv(pd->dev);
+ struct ti_lpsc *lpsc;
+
+ debug("%s(power_domain=%p, id=%d)\n", __func__, pd, args->args[0]);
+
+ if (args->args_count < 1) {
+ printf("Invalid args_count: %d\n", args->args_count);
+ return -EINVAL;
+ }
+
+ lpsc = lpsc_lookup(data, args->args[0]);
+ if (!lpsc) {
+ printf("%s: invalid dev-id: %d\n", __func__, args->args[0]);
+ return -ENOENT;
+ }
+
+ pd->id = lpsc->id;
+ pd->priv = lpsc;
+
+ return 0;
+}
+
+static int ti_power_domain_request(struct power_domain *pd)
+{
+ return 0;
+}
+
+static int ti_power_domain_free(struct power_domain *pd)
+{
+ return 0;
+}
+
+static const struct udevice_id ti_power_domain_of_match[] = {
+ { .compatible = "ti,sci-pm-domain" },
+ { /* sentinel */ }
+};
+
+static struct power_domain_ops ti_power_domain_ops = {
+ .on = ti_power_domain_on,
+ .off = ti_power_domain_off,
+ .of_xlate = ti_power_domain_of_xlate,
+ .request = ti_power_domain_request,
+ .rfree = ti_power_domain_free,
+};
+
+U_BOOT_DRIVER(ti_pm_domains) = {
+ .name = "ti-pm-domains",
+ .id = UCLASS_POWER_DOMAIN,
+ .of_match = ti_power_domain_of_match,
+ .probe = ti_power_domain_probe,
+ .priv_auto = sizeof(struct ti_k3_pd_platdata),
+ .ops = &ti_power_domain_ops,
+};
diff --git a/include/k3-dev.h b/include/k3-dev.h
new file mode 100644
index 0000000000..de3a8bdf9e
--- /dev/null
+++ b/include/k3-dev.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Texas Instruments K3 Device Platform Data
+ *
+ * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
+ */
+#ifndef __K3_DEV_H__
+#define __K3_DEV_H__
+
+#include <asm/io.h>
+#include <linux/types.h>
+#include <stdint.h>
+
+#define LPSC_MODULE_EXISTS BIT(0)
+#define LPSC_NO_CLOCK_GATING BIT(1)
+#define LPSC_DEPENDS BIT(2)
+#define LPSC_HAS_RESET_ISO BIT(3)
+#define LPSC_HAS_LOCAL_RESET BIT(4)
+#define LPSC_NO_MODULE_RESET BIT(5)
+
+#define PSC_PD_EXISTS BIT(0)
+#define PSC_PD_ALWAYSON BIT(1)
+#define PSC_PD_DEPENDS BIT(2)
+
+struct ti_psc {
+ int id;
+ void __iomem *base;
+};
+
+struct ti_pd;
+
+struct ti_pd {
+ int id;
+ int usecount;
+ struct ti_psc *psc;
+ struct ti_pd *depend;
+};
+
+struct ti_lpsc;
+
+struct ti_lpsc {
+ int id;
+ int usecount;
+ struct ti_psc *psc;
+ struct ti_pd *pd;
+ struct ti_lpsc *depend;
+};
+
+struct ti_dev {
+ struct ti_lpsc *lpsc;
+ int id;
+};
+
+/**
+ * struct ti_k3_pd_platdata - pm domain controller information structure
+ */
+struct ti_k3_pd_platdata {
+ struct ti_psc *psc;
+ struct ti_pd *pd;
+ struct ti_lpsc *lpsc;
+ struct ti_dev *devs;
+ int num_psc;
+ int num_pd;
+ int num_lpsc;
+ int num_devs;
+};
+
+#define PSC(_id, _base) { .id = _id, .base = (void *)_base, }
+#define PSC_PD(_id, _psc, _depend) { .id = _id, .psc = _psc, .depend = _depend }
+#define PSC_LPSC(_id, _psc, _pd, _depend) { .id = _id, .psc = _psc, .pd = _pd, .depend = _depend }
+#define PSC_DEV(_id, _lpsc) { .id = _id, .lpsc = _lpsc }
+
+extern const struct ti_k3_pd_platdata j721e_pd_platdata;
+extern const struct ti_k3_pd_platdata j7200_pd_platdata;
+
+#endif
--
2.17.1