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 24 struct imx93_power_domain { 25 struct generic_pm_domain genpd; 26 struct device *dev; 27 void __iomem *addr; 28 struct clk_bulk_data *clks; 29 int num_clks; 30 bool init_off; 31 }; 32 33 #define to_imx93_pd(_genpd) container_of(_genpd, struct imx93_power_domain, genpd) 34 35 static 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_ISO_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 62 static 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, 1000); 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 86 static 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 if (!domain->init_off) 93 clk_bulk_disable_unprepare(domain->num_clks, domain->clks); 94 95 of_genpd_del_provider(np); 96 pm_genpd_remove(&domain->genpd); 97 } 98 99 static int imx93_pd_probe(struct platform_device *pdev) 100 { 101 struct device *dev = &pdev->dev; 102 struct device_node *np = dev->of_node; 103 struct imx93_power_domain *domain; 104 int ret; 105 106 domain = devm_kzalloc(dev, sizeof(*domain), GFP_KERNEL); 107 if (!domain) 108 return -ENOMEM; 109 110 domain->addr = devm_platform_ioremap_resource(pdev, 0); 111 if (IS_ERR(domain->addr)) 112 return PTR_ERR(domain->addr); 113 114 domain->num_clks = devm_clk_bulk_get_all(dev, &domain->clks); 115 if (domain->num_clks < 0) 116 return dev_err_probe(dev, domain->num_clks, "Failed to get domain's clocks\n"); 117 118 domain->genpd.name = dev_name(dev); 119 domain->genpd.power_off = imx93_pd_off; 120 domain->genpd.power_on = imx93_pd_on; 121 domain->dev = dev; 122 123 domain->init_off = readl(domain->addr + MIX_FUNC_STAT_OFF) & FUNC_STAT_ISO_STAT_MASK; 124 /* Just to sync the status of hardware */ 125 if (!domain->init_off) { 126 ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks); 127 if (ret) { 128 dev_err(domain->dev, "failed to enable clocks for domain: %s\n", 129 domain->genpd.name); 130 return ret; 131 } 132 } 133 134 ret = pm_genpd_init(&domain->genpd, NULL, domain->init_off); 135 if (ret) 136 goto err_clk_unprepare; 137 138 platform_set_drvdata(pdev, domain); 139 140 ret = of_genpd_add_provider_simple(np, &domain->genpd); 141 if (ret) 142 goto err_genpd_remove; 143 144 return 0; 145 146 err_genpd_remove: 147 pm_genpd_remove(&domain->genpd); 148 149 err_clk_unprepare: 150 if (!domain->init_off) 151 clk_bulk_disable_unprepare(domain->num_clks, domain->clks); 152 153 return ret; 154 } 155 156 static const struct of_device_id imx93_pd_ids[] = { 157 { .compatible = "fsl,imx93-src-slice" }, 158 { } 159 }; 160 MODULE_DEVICE_TABLE(of, imx93_pd_ids); 161 162 static struct platform_driver imx93_power_domain_driver = { 163 .driver = { 164 .name = "imx93_power_domain", 165 .of_match_table = imx93_pd_ids, 166 }, 167 .probe = imx93_pd_probe, 168 .remove_new = imx93_pd_remove, 169 }; 170 module_platform_driver(imx93_power_domain_driver); 171 172 MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>"); 173 MODULE_DESCRIPTION("NXP i.MX93 power domain driver"); 174 MODULE_LICENSE("GPL"); 175