drivers/soc/imx/imx93-pd.c

   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/of_device.h>
   9 #include <linux/iopoll.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 int 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         return 0;
  99 }
 100
 101 static int imx93_pd_probe(struct platform_device *pdev)
 102 {
 103         struct device *dev = &pdev->dev;
 104         struct device_node *np = dev->of_node;
 105         struct imx93_power_domain *domain;
 106         int ret;
 107
 108         domain = devm_kzalloc(dev, sizeof(*domain), GFP_KERNEL);
 109         if (!domain)
 110                 return -ENOMEM;
 111
 112         domain->addr = devm_platform_ioremap_resource(pdev, 0);
 113         if (IS_ERR(domain->addr))
 114                 return PTR_ERR(domain->addr);
 115
 116         domain->num_clks = devm_clk_bulk_get_all(dev, &domain->clks);
 117         if (domain->num_clks < 0)
 118                 return dev_err_probe(dev, domain->num_clks, "Failed to get domain's clocks\n");
 119
 120         domain->genpd.name = dev_name(dev);
 121         domain->genpd.power_off = imx93_pd_off;
 122         domain->genpd.power_on = imx93_pd_on;
 123         domain->dev = dev;
 124
 125         domain->init_off = readl(domain->addr + MIX_FUNC_STAT_OFF) & FUNC_STAT_ISO_STAT_MASK;
 126         /* Just to sync the status of hardware */
 127         if (!domain->init_off) {
 128                 ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks);
 129                 if (ret) {
 130                         dev_err(domain->dev, "failed to enable clocks for domain: %s\n",
 131                                 domain->genpd.name);
 132                         return ret;
 133                 }
 134         }
 135
 136         ret = pm_genpd_init(&domain->genpd, NULL, domain->init_off);
 137         if (ret)
 138                 goto err_clk_unprepare;
 139
 140         platform_set_drvdata(pdev, domain);
 141
 142         ret = of_genpd_add_provider_simple(np, &domain->genpd);
 143         if (ret)
 144                 goto err_genpd_remove;
 145
 146         return 0;
 147
 148 err_genpd_remove:
 149         pm_genpd_remove(&domain->genpd);
 150
 151 err_clk_unprepare:
 152         if (!domain->init_off)
 153                 clk_bulk_disable_unprepare(domain->num_clks, domain->clks);
 154
 155         return ret;
 156 }
 157
 158 static const struct of_device_id imx93_pd_ids[] = {
 159         { .compatible = "fsl,imx93-src-slice" },
 160         { }
 161 };
 162 MODULE_DEVICE_TABLE(of, imx93_pd_ids);
 163
 164 static struct platform_driver imx93_power_domain_driver = {
 165         .driver = {
 166                 .name   = "imx93_power_domain",
 167                 .owner  = THIS_MODULE,
 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 <[email protected]>");
 176 MODULE_DESCRIPTION("NXP i.MX93 power domain driver");
 177 MODULE_LICENSE("GPL");