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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright 2022 NXP4 */5 6#include <linux/clk.h>7#include <linux/delay.h>8#include <linux/iopoll.h>9#include <linux/mod_devicetable.h>10#include <linux/module.h>11#include <linux/platform_device.h>12#include <linux/pm_domain.h>13 14#define MIX_SLICE_SW_CTRL_OFF 0x2015#define SLICE_SW_CTRL_PSW_CTRL_OFF_MASK BIT(4)16#define SLICE_SW_CTRL_PDN_SOFT_MASK BIT(31)17 18#define MIX_FUNC_STAT_OFF 0xB419 20#define FUNC_STAT_PSW_STAT_MASK BIT(0)21#define FUNC_STAT_RST_STAT_MASK BIT(2)22#define FUNC_STAT_ISO_STAT_MASK BIT(4)23#define FUNC_STAT_SSAR_STAT_MASK BIT(8)24 25struct imx93_power_domain {26 struct generic_pm_domain genpd;27 struct device *dev;28 void __iomem *addr;29 struct clk_bulk_data *clks;30 int num_clks;31};32 33#define to_imx93_pd(_genpd) container_of(_genpd, struct imx93_power_domain, genpd)34 35static int imx93_pd_on(struct generic_pm_domain *genpd)36{37 struct imx93_power_domain *domain = to_imx93_pd(genpd);38 void __iomem *addr = domain->addr;39 u32 val;40 int ret;41 42 ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks);43 if (ret) {44 dev_err(domain->dev, "failed to enable clocks for domain: %s\n", genpd->name);45 return ret;46 }47 48 val = readl(addr + MIX_SLICE_SW_CTRL_OFF);49 val &= ~SLICE_SW_CTRL_PDN_SOFT_MASK;50 writel(val, addr + MIX_SLICE_SW_CTRL_OFF);51 52 ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val,53 !(val & FUNC_STAT_SSAR_STAT_MASK), 1, 10000);54 if (ret) {55 dev_err(domain->dev, "pd_on timeout: name: %s, stat: %x\n", genpd->name, val);56 return ret;57 }58 59 return 0;60}61 62static int imx93_pd_off(struct generic_pm_domain *genpd)63{64 struct imx93_power_domain *domain = to_imx93_pd(genpd);65 void __iomem *addr = domain->addr;66 int ret;67 u32 val;68 69 /* Power off MIX */70 val = readl(addr + MIX_SLICE_SW_CTRL_OFF);71 val |= SLICE_SW_CTRL_PDN_SOFT_MASK;72 writel(val, addr + MIX_SLICE_SW_CTRL_OFF);73 74 ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val,75 val & FUNC_STAT_PSW_STAT_MASK, 1, 10000);76 if (ret) {77 dev_err(domain->dev, "pd_off timeout: name: %s, stat: %x\n", genpd->name, val);78 return ret;79 }80 81 clk_bulk_disable_unprepare(domain->num_clks, domain->clks);82 83 return 0;84};85 86static void imx93_pd_remove(struct platform_device *pdev)87{88 struct imx93_power_domain *domain = platform_get_drvdata(pdev);89 struct device *dev = &pdev->dev;90 struct device_node *np = dev->of_node;91 92 of_genpd_del_provider(np);93 pm_genpd_remove(&domain->genpd);94}95 96static int imx93_pd_probe(struct platform_device *pdev)97{98 struct device *dev = &pdev->dev;99 struct device_node *np = dev->of_node;100 struct imx93_power_domain *domain;101 bool init_off;102 int ret;103 104 domain = devm_kzalloc(dev, sizeof(*domain), GFP_KERNEL);105 if (!domain)106 return -ENOMEM;107 108 domain->addr = devm_platform_ioremap_resource(pdev, 0);109 if (IS_ERR(domain->addr))110 return PTR_ERR(domain->addr);111 112 domain->num_clks = devm_clk_bulk_get_all(dev, &domain->clks);113 if (domain->num_clks < 0)114 return dev_err_probe(dev, domain->num_clks, "Failed to get domain's clocks\n");115 116 domain->genpd.name = dev_name(dev);117 domain->genpd.power_off = imx93_pd_off;118 domain->genpd.power_on = imx93_pd_on;119 domain->dev = dev;120 121 init_off = readl(domain->addr + MIX_FUNC_STAT_OFF) & FUNC_STAT_ISO_STAT_MASK;122 /* Just to sync the status of hardware */123 if (!init_off) {124 ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks);125 if (ret)126 return dev_err_probe(domain->dev, ret,127 "failed to enable clocks for domain: %s\n",128 domain->genpd.name);129 }130 131 ret = pm_genpd_init(&domain->genpd, NULL, init_off);132 if (ret)133 goto err_clk_unprepare;134 135 platform_set_drvdata(pdev, domain);136 137 ret = of_genpd_add_provider_simple(np, &domain->genpd);138 if (ret)139 goto err_genpd_remove;140 141 return 0;142 143err_genpd_remove:144 pm_genpd_remove(&domain->genpd);145 146err_clk_unprepare:147 if (!init_off)148 clk_bulk_disable_unprepare(domain->num_clks, domain->clks);149 150 return ret;151}152 153static const struct of_device_id imx93_pd_ids[] = {154 { .compatible = "fsl,imx93-src-slice" },155 { }156};157MODULE_DEVICE_TABLE(of, imx93_pd_ids);158 159static struct platform_driver imx93_power_domain_driver = {160 .driver = {161 .name = "imx93_power_domain",162 .of_match_table = imx93_pd_ids,163 },164 .probe = imx93_pd_probe,165 .remove_new = imx93_pd_remove,166};167module_platform_driver(imx93_power_domain_driver);168 169MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");170MODULE_DESCRIPTION("NXP i.MX93 power domain driver");171MODULE_LICENSE("GPL");172