From: Tero Kristo t-kristo@ti.com
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..5d089f8e19 --- /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[] = { +#ifdef 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