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power: domain: Introduce driver for raw TI K3 PDs 

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>
This commit is contained in:
Tero Kristo 2021-06-11 11:45:15 +03:00 committed by Lokesh Vutla
parent b4a72a9f5b
commit 144464bd2c
4 changed files with 452 additions and 0 deletions
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7
drivers/power/domain/Kconfig
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@ -72,4 +72,11 @@ config TI_SCI_POWER_DOMAIN
help help
Generic power domain implementation for TI devices implementing the Generic power domain implementation for TI devices implementing the
TI SCI protocol. 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 endmenu

1
drivers/power/domain/Makefile
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@ -14,3 +14,4 @@ obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o
obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o
obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o
obj-$(CONFIG_TI_SCI_POWER_DOMAIN) += ti-sci-power-domain.o obj-$(CONFIG_TI_SCI_POWER_DOMAIN) += ti-sci-power-domain.o
obj-$(CONFIG_TI_POWER_DOMAIN) += ti-power-domain.o

368
drivers/power/domain/ti-power-domain.c Normal file
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@ -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,
};

76
include/k3-dev.h Normal file
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@ -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