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![Chun-Jie Chen](/assets/img/avatar_default.png)
[ Upstream commitac0ca39554
] Due to some power domain needs to keep on for wakeup in system suspend, so add GENPD_FLAG_ACTIVE_WAKEUP support in Mediatek power domain driver. Fixes:59b644b01c
("soc: mediatek: Add MediaTek SCPSYS power domains") Signed-off-by: Chun-Jie Chen <chun-jie.chen@mediatek.com> Reviewed-by: Chen-Yu Tsai <wenst@chromium.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Link: https://lore.kernel.org/r/20220130012104.5292-3-chun-jie.chen@mediatek.com Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
657 lines
16 KiB
C
657 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2020 Collabora Ltd.
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/mfd/syscon.h>
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#include <linux/of_clk.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_domain.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/soc/mediatek/infracfg.h>
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#include "mt8167-pm-domains.h"
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#include "mt8173-pm-domains.h"
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#include "mt8183-pm-domains.h"
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#include "mt8192-pm-domains.h"
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#define MTK_POLL_DELAY_US 10
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#define MTK_POLL_TIMEOUT USEC_PER_SEC
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#define PWR_RST_B_BIT BIT(0)
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#define PWR_ISO_BIT BIT(1)
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#define PWR_ON_BIT BIT(2)
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#define PWR_ON_2ND_BIT BIT(3)
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#define PWR_CLK_DIS_BIT BIT(4)
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#define PWR_SRAM_CLKISO_BIT BIT(5)
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#define PWR_SRAM_ISOINT_B_BIT BIT(6)
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struct scpsys_domain {
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struct generic_pm_domain genpd;
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const struct scpsys_domain_data *data;
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struct scpsys *scpsys;
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int num_clks;
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struct clk_bulk_data *clks;
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int num_subsys_clks;
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struct clk_bulk_data *subsys_clks;
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struct regmap *infracfg;
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struct regmap *smi;
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struct regulator *supply;
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};
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struct scpsys {
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struct device *dev;
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struct regmap *base;
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const struct scpsys_soc_data *soc_data;
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struct genpd_onecell_data pd_data;
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struct generic_pm_domain *domains[];
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};
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#define to_scpsys_domain(gpd) container_of(gpd, struct scpsys_domain, genpd)
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static bool scpsys_domain_is_on(struct scpsys_domain *pd)
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{
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struct scpsys *scpsys = pd->scpsys;
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u32 status, status2;
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regmap_read(scpsys->base, scpsys->soc_data->pwr_sta_offs, &status);
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status &= pd->data->sta_mask;
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regmap_read(scpsys->base, scpsys->soc_data->pwr_sta2nd_offs, &status2);
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status2 &= pd->data->sta_mask;
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/* A domain is on when both status bits are set. */
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return status && status2;
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}
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static int scpsys_sram_enable(struct scpsys_domain *pd)
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{
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u32 pdn_ack = pd->data->sram_pdn_ack_bits;
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struct scpsys *scpsys = pd->scpsys;
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unsigned int tmp;
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int ret;
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regmap_clear_bits(scpsys->base, pd->data->ctl_offs, pd->data->sram_pdn_bits);
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/* Either wait until SRAM_PDN_ACK all 1 or 0 */
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ret = regmap_read_poll_timeout(scpsys->base, pd->data->ctl_offs, tmp,
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(tmp & pdn_ack) == 0, MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
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if (ret < 0)
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return ret;
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if (MTK_SCPD_CAPS(pd, MTK_SCPD_SRAM_ISO)) {
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regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_SRAM_ISOINT_B_BIT);
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udelay(1);
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regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_SRAM_CLKISO_BIT);
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}
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return 0;
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}
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static int scpsys_sram_disable(struct scpsys_domain *pd)
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{
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u32 pdn_ack = pd->data->sram_pdn_ack_bits;
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struct scpsys *scpsys = pd->scpsys;
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unsigned int tmp;
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if (MTK_SCPD_CAPS(pd, MTK_SCPD_SRAM_ISO)) {
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regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_SRAM_CLKISO_BIT);
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udelay(1);
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regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_SRAM_ISOINT_B_BIT);
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}
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regmap_set_bits(scpsys->base, pd->data->ctl_offs, pd->data->sram_pdn_bits);
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/* Either wait until SRAM_PDN_ACK all 1 or 0 */
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return regmap_read_poll_timeout(scpsys->base, pd->data->ctl_offs, tmp,
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(tmp & pdn_ack) == pdn_ack, MTK_POLL_DELAY_US,
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MTK_POLL_TIMEOUT);
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}
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static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, struct regmap *regmap)
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{
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int i, ret;
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for (i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) {
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u32 val, mask = bpd[i].bus_prot_mask;
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if (!mask)
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break;
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if (bpd[i].bus_prot_reg_update)
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regmap_set_bits(regmap, bpd[i].bus_prot_set, mask);
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else
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regmap_write(regmap, bpd[i].bus_prot_set, mask);
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ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
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val, (val & mask) == mask,
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MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
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{
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int ret;
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ret = _scpsys_bus_protect_enable(pd->data->bp_infracfg, pd->infracfg);
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if (ret)
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return ret;
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return _scpsys_bus_protect_enable(pd->data->bp_smi, pd->smi);
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}
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static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
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struct regmap *regmap)
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{
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int i, ret;
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for (i = SPM_MAX_BUS_PROT_DATA - 1; i >= 0; i--) {
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u32 val, mask = bpd[i].bus_prot_mask;
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if (!mask)
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continue;
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if (bpd[i].bus_prot_reg_update)
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regmap_clear_bits(regmap, bpd[i].bus_prot_clr, mask);
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else
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regmap_write(regmap, bpd[i].bus_prot_clr, mask);
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if (bpd[i].ignore_clr_ack)
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continue;
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ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
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val, !(val & mask),
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MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
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{
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int ret;
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ret = _scpsys_bus_protect_disable(pd->data->bp_smi, pd->smi);
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if (ret)
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return ret;
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return _scpsys_bus_protect_disable(pd->data->bp_infracfg, pd->infracfg);
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}
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static int scpsys_regulator_enable(struct regulator *supply)
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{
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return supply ? regulator_enable(supply) : 0;
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}
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static int scpsys_regulator_disable(struct regulator *supply)
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{
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return supply ? regulator_disable(supply) : 0;
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}
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static int scpsys_power_on(struct generic_pm_domain *genpd)
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{
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struct scpsys_domain *pd = container_of(genpd, struct scpsys_domain, genpd);
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struct scpsys *scpsys = pd->scpsys;
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bool tmp;
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int ret;
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ret = scpsys_regulator_enable(pd->supply);
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if (ret)
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return ret;
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ret = clk_bulk_prepare_enable(pd->num_clks, pd->clks);
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if (ret)
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goto err_reg;
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/* subsys power on */
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regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_ON_BIT);
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regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_ON_2ND_BIT);
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/* wait until PWR_ACK = 1 */
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ret = readx_poll_timeout(scpsys_domain_is_on, pd, tmp, tmp, MTK_POLL_DELAY_US,
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MTK_POLL_TIMEOUT);
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if (ret < 0)
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goto err_pwr_ack;
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regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_CLK_DIS_BIT);
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regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_ISO_BIT);
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regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_RST_B_BIT);
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ret = clk_bulk_prepare_enable(pd->num_subsys_clks, pd->subsys_clks);
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if (ret)
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goto err_pwr_ack;
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ret = scpsys_sram_enable(pd);
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if (ret < 0)
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goto err_disable_subsys_clks;
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ret = scpsys_bus_protect_disable(pd);
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if (ret < 0)
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goto err_disable_sram;
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return 0;
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err_disable_sram:
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scpsys_sram_disable(pd);
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err_disable_subsys_clks:
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clk_bulk_disable_unprepare(pd->num_subsys_clks, pd->subsys_clks);
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err_pwr_ack:
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clk_bulk_disable_unprepare(pd->num_clks, pd->clks);
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err_reg:
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scpsys_regulator_disable(pd->supply);
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return ret;
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}
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static int scpsys_power_off(struct generic_pm_domain *genpd)
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{
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struct scpsys_domain *pd = container_of(genpd, struct scpsys_domain, genpd);
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struct scpsys *scpsys = pd->scpsys;
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bool tmp;
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int ret;
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ret = scpsys_bus_protect_enable(pd);
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if (ret < 0)
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return ret;
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ret = scpsys_sram_disable(pd);
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if (ret < 0)
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return ret;
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clk_bulk_disable_unprepare(pd->num_subsys_clks, pd->subsys_clks);
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/* subsys power off */
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regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_RST_B_BIT);
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regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_ISO_BIT);
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regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_CLK_DIS_BIT);
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regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_ON_2ND_BIT);
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regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_ON_BIT);
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/* wait until PWR_ACK = 0 */
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ret = readx_poll_timeout(scpsys_domain_is_on, pd, tmp, !tmp, MTK_POLL_DELAY_US,
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MTK_POLL_TIMEOUT);
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if (ret < 0)
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return ret;
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clk_bulk_disable_unprepare(pd->num_clks, pd->clks);
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scpsys_regulator_disable(pd->supply);
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return 0;
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}
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static struct
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generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_node *node)
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{
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const struct scpsys_domain_data *domain_data;
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struct scpsys_domain *pd;
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struct device_node *root_node = scpsys->dev->of_node;
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struct device_node *smi_node;
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struct property *prop;
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const char *clk_name;
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int i, ret, num_clks;
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struct clk *clk;
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int clk_ind = 0;
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u32 id;
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ret = of_property_read_u32(node, "reg", &id);
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if (ret) {
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dev_err(scpsys->dev, "%pOF: failed to retrieve domain id from reg: %d\n",
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node, ret);
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return ERR_PTR(-EINVAL);
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}
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if (id >= scpsys->soc_data->num_domains) {
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dev_err(scpsys->dev, "%pOF: invalid domain id %d\n", node, id);
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return ERR_PTR(-EINVAL);
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}
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domain_data = &scpsys->soc_data->domains_data[id];
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if (domain_data->sta_mask == 0) {
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dev_err(scpsys->dev, "%pOF: undefined domain id %d\n", node, id);
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return ERR_PTR(-EINVAL);
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}
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pd = devm_kzalloc(scpsys->dev, sizeof(*pd), GFP_KERNEL);
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if (!pd)
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return ERR_PTR(-ENOMEM);
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pd->data = domain_data;
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pd->scpsys = scpsys;
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if (MTK_SCPD_CAPS(pd, MTK_SCPD_DOMAIN_SUPPLY)) {
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/*
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* Find regulator in current power domain node.
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* devm_regulator_get() finds regulator in a node and its child
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* node, so set of_node to current power domain node then change
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* back to original node after regulator is found for current
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* power domain node.
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*/
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scpsys->dev->of_node = node;
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pd->supply = devm_regulator_get(scpsys->dev, "domain");
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scpsys->dev->of_node = root_node;
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if (IS_ERR(pd->supply)) {
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dev_err_probe(scpsys->dev, PTR_ERR(pd->supply),
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"%pOF: failed to get power supply.\n",
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node);
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return ERR_CAST(pd->supply);
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}
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}
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pd->infracfg = syscon_regmap_lookup_by_phandle_optional(node, "mediatek,infracfg");
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if (IS_ERR(pd->infracfg))
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return ERR_CAST(pd->infracfg);
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smi_node = of_parse_phandle(node, "mediatek,smi", 0);
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if (smi_node) {
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pd->smi = device_node_to_regmap(smi_node);
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of_node_put(smi_node);
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if (IS_ERR(pd->smi))
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return ERR_CAST(pd->smi);
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}
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num_clks = of_clk_get_parent_count(node);
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if (num_clks > 0) {
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/* Calculate number of subsys_clks */
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of_property_for_each_string(node, "clock-names", prop, clk_name) {
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char *subsys;
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subsys = strchr(clk_name, '-');
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if (subsys)
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pd->num_subsys_clks++;
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else
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pd->num_clks++;
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}
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pd->clks = devm_kcalloc(scpsys->dev, pd->num_clks, sizeof(*pd->clks), GFP_KERNEL);
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if (!pd->clks)
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return ERR_PTR(-ENOMEM);
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pd->subsys_clks = devm_kcalloc(scpsys->dev, pd->num_subsys_clks,
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sizeof(*pd->subsys_clks), GFP_KERNEL);
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if (!pd->subsys_clks)
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return ERR_PTR(-ENOMEM);
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}
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for (i = 0; i < pd->num_clks; i++) {
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clk = of_clk_get(node, i);
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if (IS_ERR(clk)) {
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ret = PTR_ERR(clk);
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dev_err_probe(scpsys->dev, ret,
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"%pOF: failed to get clk at index %d: %d\n", node, i, ret);
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goto err_put_clocks;
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}
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pd->clks[clk_ind++].clk = clk;
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}
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for (i = 0; i < pd->num_subsys_clks; i++) {
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clk = of_clk_get(node, i + clk_ind);
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if (IS_ERR(clk)) {
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ret = PTR_ERR(clk);
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dev_err_probe(scpsys->dev, ret,
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"%pOF: failed to get clk at index %d: %d\n", node,
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i + clk_ind, ret);
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goto err_put_subsys_clocks;
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}
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pd->subsys_clks[i].clk = clk;
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}
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/*
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* Initially turn on all domains to make the domains usable
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* with !CONFIG_PM and to get the hardware in sync with the
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* software. The unused domains will be switched off during
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* late_init time.
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*/
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if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF)) {
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if (scpsys_domain_is_on(pd))
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dev_warn(scpsys->dev,
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"%pOF: A default off power domain has been ON\n", node);
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} else {
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ret = scpsys_power_on(&pd->genpd);
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if (ret < 0) {
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dev_err(scpsys->dev, "%pOF: failed to power on domain: %d\n", node, ret);
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goto err_put_subsys_clocks;
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}
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}
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if (scpsys->domains[id]) {
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ret = -EINVAL;
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dev_err(scpsys->dev,
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"power domain with id %d already exists, check your device-tree\n", id);
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goto err_put_subsys_clocks;
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}
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if (!pd->data->name)
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pd->genpd.name = node->name;
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else
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pd->genpd.name = pd->data->name;
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pd->genpd.power_off = scpsys_power_off;
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pd->genpd.power_on = scpsys_power_on;
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if (MTK_SCPD_CAPS(pd, MTK_SCPD_ACTIVE_WAKEUP))
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pd->genpd.flags |= GENPD_FLAG_ACTIVE_WAKEUP;
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if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF))
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pm_genpd_init(&pd->genpd, NULL, true);
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else
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pm_genpd_init(&pd->genpd, NULL, false);
|
|
|
|
scpsys->domains[id] = &pd->genpd;
|
|
|
|
return scpsys->pd_data.domains[id];
|
|
|
|
err_put_subsys_clocks:
|
|
clk_bulk_put(pd->num_subsys_clks, pd->subsys_clks);
|
|
err_put_clocks:
|
|
clk_bulk_put(pd->num_clks, pd->clks);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static int scpsys_add_subdomain(struct scpsys *scpsys, struct device_node *parent)
|
|
{
|
|
struct generic_pm_domain *child_pd, *parent_pd;
|
|
struct device_node *child;
|
|
int ret;
|
|
|
|
for_each_child_of_node(parent, child) {
|
|
u32 id;
|
|
|
|
ret = of_property_read_u32(parent, "reg", &id);
|
|
if (ret) {
|
|
dev_err(scpsys->dev, "%pOF: failed to get parent domain id\n", child);
|
|
goto err_put_node;
|
|
}
|
|
|
|
if (!scpsys->pd_data.domains[id]) {
|
|
ret = -EINVAL;
|
|
dev_err(scpsys->dev, "power domain with id %d does not exist\n", id);
|
|
goto err_put_node;
|
|
}
|
|
|
|
parent_pd = scpsys->pd_data.domains[id];
|
|
|
|
child_pd = scpsys_add_one_domain(scpsys, child);
|
|
if (IS_ERR(child_pd)) {
|
|
ret = PTR_ERR(child_pd);
|
|
dev_err_probe(scpsys->dev, ret, "%pOF: failed to get child domain id\n",
|
|
child);
|
|
goto err_put_node;
|
|
}
|
|
|
|
ret = pm_genpd_add_subdomain(parent_pd, child_pd);
|
|
if (ret) {
|
|
dev_err(scpsys->dev, "failed to add %s subdomain to parent %s\n",
|
|
child_pd->name, parent_pd->name);
|
|
goto err_put_node;
|
|
} else {
|
|
dev_dbg(scpsys->dev, "%s add subdomain: %s\n", parent_pd->name,
|
|
child_pd->name);
|
|
}
|
|
|
|
/* recursive call to add all subdomains */
|
|
ret = scpsys_add_subdomain(scpsys, child);
|
|
if (ret)
|
|
goto err_put_node;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_put_node:
|
|
of_node_put(child);
|
|
return ret;
|
|
}
|
|
|
|
static void scpsys_remove_one_domain(struct scpsys_domain *pd)
|
|
{
|
|
int ret;
|
|
|
|
if (scpsys_domain_is_on(pd))
|
|
scpsys_power_off(&pd->genpd);
|
|
|
|
/*
|
|
* We're in the error cleanup already, so we only complain,
|
|
* but won't emit another error on top of the original one.
|
|
*/
|
|
ret = pm_genpd_remove(&pd->genpd);
|
|
if (ret < 0)
|
|
dev_err(pd->scpsys->dev,
|
|
"failed to remove domain '%s' : %d - state may be inconsistent\n",
|
|
pd->genpd.name, ret);
|
|
|
|
clk_bulk_put(pd->num_clks, pd->clks);
|
|
clk_bulk_put(pd->num_subsys_clks, pd->subsys_clks);
|
|
}
|
|
|
|
static void scpsys_domain_cleanup(struct scpsys *scpsys)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
struct scpsys_domain *pd;
|
|
int i;
|
|
|
|
for (i = scpsys->pd_data.num_domains - 1; i >= 0; i--) {
|
|
genpd = scpsys->pd_data.domains[i];
|
|
if (genpd) {
|
|
pd = to_scpsys_domain(genpd);
|
|
scpsys_remove_one_domain(pd);
|
|
}
|
|
}
|
|
}
|
|
|
|
static const struct of_device_id scpsys_of_match[] = {
|
|
{
|
|
.compatible = "mediatek,mt8167-power-controller",
|
|
.data = &mt8167_scpsys_data,
|
|
},
|
|
{
|
|
.compatible = "mediatek,mt8173-power-controller",
|
|
.data = &mt8173_scpsys_data,
|
|
},
|
|
{
|
|
.compatible = "mediatek,mt8183-power-controller",
|
|
.data = &mt8183_scpsys_data,
|
|
},
|
|
{
|
|
.compatible = "mediatek,mt8192-power-controller",
|
|
.data = &mt8192_scpsys_data,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int scpsys_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *np = dev->of_node;
|
|
const struct scpsys_soc_data *soc;
|
|
struct device_node *node;
|
|
struct device *parent;
|
|
struct scpsys *scpsys;
|
|
int ret;
|
|
|
|
soc = of_device_get_match_data(&pdev->dev);
|
|
if (!soc) {
|
|
dev_err(&pdev->dev, "no power controller data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
scpsys = devm_kzalloc(dev, struct_size(scpsys, domains, soc->num_domains), GFP_KERNEL);
|
|
if (!scpsys)
|
|
return -ENOMEM;
|
|
|
|
scpsys->dev = dev;
|
|
scpsys->soc_data = soc;
|
|
|
|
scpsys->pd_data.domains = scpsys->domains;
|
|
scpsys->pd_data.num_domains = soc->num_domains;
|
|
|
|
parent = dev->parent;
|
|
if (!parent) {
|
|
dev_err(dev, "no parent for syscon devices\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
scpsys->base = syscon_node_to_regmap(parent->of_node);
|
|
if (IS_ERR(scpsys->base)) {
|
|
dev_err(dev, "no regmap available\n");
|
|
return PTR_ERR(scpsys->base);
|
|
}
|
|
|
|
ret = -ENODEV;
|
|
for_each_available_child_of_node(np, node) {
|
|
struct generic_pm_domain *domain;
|
|
|
|
domain = scpsys_add_one_domain(scpsys, node);
|
|
if (IS_ERR(domain)) {
|
|
ret = PTR_ERR(domain);
|
|
of_node_put(node);
|
|
goto err_cleanup_domains;
|
|
}
|
|
|
|
ret = scpsys_add_subdomain(scpsys, node);
|
|
if (ret) {
|
|
of_node_put(node);
|
|
goto err_cleanup_domains;
|
|
}
|
|
}
|
|
|
|
if (ret) {
|
|
dev_dbg(dev, "no power domains present\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = of_genpd_add_provider_onecell(np, &scpsys->pd_data);
|
|
if (ret) {
|
|
dev_err(dev, "failed to add provider: %d\n", ret);
|
|
goto err_cleanup_domains;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_cleanup_domains:
|
|
scpsys_domain_cleanup(scpsys);
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver scpsys_pm_domain_driver = {
|
|
.probe = scpsys_probe,
|
|
.driver = {
|
|
.name = "mtk-power-controller",
|
|
.suppress_bind_attrs = true,
|
|
.of_match_table = scpsys_of_match,
|
|
},
|
|
};
|
|
builtin_platform_driver(scpsys_pm_domain_driver);
|