1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2022 NXP 4 */ 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 0x20 15 #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 0xB4 19 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 25 struct 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 bool init_off; 32 }; 33 34 #define to_imx93_pd(_genpd) container_of(_genpd, struct imx93_power_domain, genpd) 35 36 static int imx93_pd_on(struct generic_pm_domain *genpd) 37 { 38 struct imx93_power_domain *domain = to_imx93_pd(genpd); 39 void __iomem *addr = domain->addr; 40 u32 val; 41 int ret; 42 43 ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks); 44 if (ret) { 45 dev_err(domain->dev, "failed to enable clocks for domain: %s\n", genpd->name); 46 return ret; 47 } 48 49 val = readl(addr + MIX_SLICE_SW_CTRL_OFF); 50 val &= ~SLICE_SW_CTRL_PDN_SOFT_MASK; 51 writel(val, addr + MIX_SLICE_SW_CTRL_OFF); 52 53 ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val, 54 !(val & FUNC_STAT_SSAR_STAT_MASK), 1, 10000); 55 if (ret) { 56 dev_err(domain->dev, "pd_on timeout: name: %s, stat: %x\n", genpd->name, val); 57 return ret; 58 } 59 60 return 0; 61 } 62 63 static int imx93_pd_off(struct generic_pm_domain *genpd) 64 { 65 struct imx93_power_domain *domain = to_imx93_pd(genpd); 66 void __iomem *addr = domain->addr; 67 int ret; 68 u32 val; 69 70 /* Power off MIX */ 71 val = readl(addr + MIX_SLICE_SW_CTRL_OFF); 72 val |= SLICE_SW_CTRL_PDN_SOFT_MASK; 73 writel(val, addr + MIX_SLICE_SW_CTRL_OFF); 74 75 ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val, 76 val & FUNC_STAT_PSW_STAT_MASK, 1, 10000); 77 if (ret) { 78 dev_err(domain->dev, "pd_off timeout: name: %s, stat: %x\n", genpd->name, val); 79 return ret; 80 } 81 82 clk_bulk_disable_unprepare(domain->num_clks, domain->clks); 83 84 return 0; 85 }; 86 87 static int imx93_pd_remove(struct platform_device *pdev) 88 { 89 struct imx93_power_domain *domain = platform_get_drvdata(pdev); 90 struct device *dev = &pdev->dev; 91 struct device_node *np = dev->of_node; 92 93 if (!domain->init_off) 94 clk_bulk_disable_unprepare(domain->num_clks, domain->clks); 95 96 of_genpd_del_provider(np); 97 pm_genpd_remove(&domain->genpd); 98 99 return 0; 100 } 101 102 static int imx93_pd_probe(struct platform_device *pdev) 103 { 104 struct device *dev = &pdev->dev; 105 struct device_node *np = dev->of_node; 106 struct imx93_power_domain *domain; 107 int ret; 108 109 domain = devm_kzalloc(dev, sizeof(*domain), GFP_KERNEL); 110 if (!domain) 111 return -ENOMEM; 112 113 domain->addr = devm_platform_ioremap_resource(pdev, 0); 114 if (IS_ERR(domain->addr)) 115 return PTR_ERR(domain->addr); 116 117 domain->num_clks = devm_clk_bulk_get_all(dev, &domain->clks); 118 if (domain->num_clks < 0) 119 return dev_err_probe(dev, domain->num_clks, "Failed to get domain's clocks\n"); 120 121 domain->genpd.name = dev_name(dev); 122 domain->genpd.power_off = imx93_pd_off; 123 domain->genpd.power_on = imx93_pd_on; 124 domain->dev = dev; 125 126 domain->init_off = readl(domain->addr + MIX_FUNC_STAT_OFF) & FUNC_STAT_ISO_STAT_MASK; 127 /* Just to sync the status of hardware */ 128 if (!domain->init_off) { 129 ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks); 130 if (ret) { 131 dev_err(domain->dev, "failed to enable clocks for domain: %s\n", 132 domain->genpd.name); 133 return ret; 134 } 135 } 136 137 ret = pm_genpd_init(&domain->genpd, NULL, domain->init_off); 138 if (ret) 139 goto err_clk_unprepare; 140 141 platform_set_drvdata(pdev, domain); 142 143 ret = of_genpd_add_provider_simple(np, &domain->genpd); 144 if (ret) 145 goto err_genpd_remove; 146 147 return 0; 148 149 err_genpd_remove: 150 pm_genpd_remove(&domain->genpd); 151 152 err_clk_unprepare: 153 if (!domain->init_off) 154 clk_bulk_disable_unprepare(domain->num_clks, domain->clks); 155 156 return ret; 157 } 158 159 static const struct of_device_id imx93_pd_ids[] = { 160 { .compatible = "fsl,imx93-src-slice" }, 161 { } 162 }; 163 MODULE_DEVICE_TABLE(of, imx93_pd_ids); 164 165 static struct platform_driver imx93_power_domain_driver = { 166 .driver = { 167 .name = "imx93_power_domain", 168 .of_match_table = imx93_pd_ids, 169 }, 170 .probe = imx93_pd_probe, 171 .remove = imx93_pd_remove, 172 }; 173 module_platform_driver(imx93_power_domain_driver); 174 175 MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>"); 176 MODULE_DESCRIPTION("NXP i.MX93 power domain driver"); 177 MODULE_LICENSE("GPL"); 178