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177 lines
4.4 KiB
177 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright 2022 NXP |
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*/ |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/of_device.h> |
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#include <linux/iopoll.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_domain.h> |
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#define MIX_SLICE_SW_CTRL_OFF 0x20 |
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#define SLICE_SW_CTRL_PSW_CTRL_OFF_MASK BIT(4) |
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#define SLICE_SW_CTRL_PDN_SOFT_MASK BIT(31) |
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#define MIX_FUNC_STAT_OFF 0xB4 |
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#define FUNC_STAT_PSW_STAT_MASK BIT(0) |
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#define FUNC_STAT_RST_STAT_MASK BIT(2) |
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#define FUNC_STAT_ISO_STAT_MASK BIT(4) |
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struct imx93_power_domain { |
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struct generic_pm_domain genpd; |
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struct device *dev; |
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void __iomem *addr; |
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struct clk_bulk_data *clks; |
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int num_clks; |
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bool init_off; |
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}; |
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#define to_imx93_pd(_genpd) container_of(_genpd, struct imx93_power_domain, genpd) |
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static int imx93_pd_on(struct generic_pm_domain *genpd) |
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{ |
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struct imx93_power_domain *domain = to_imx93_pd(genpd); |
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void __iomem *addr = domain->addr; |
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u32 val; |
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int ret; |
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ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks); |
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if (ret) { |
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dev_err(domain->dev, "failed to enable clocks for domain: %s\n", genpd->name); |
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return ret; |
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} |
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val = readl(addr + MIX_SLICE_SW_CTRL_OFF); |
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val &= ~SLICE_SW_CTRL_PDN_SOFT_MASK; |
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writel(val, addr + MIX_SLICE_SW_CTRL_OFF); |
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ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val, |
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!(val & FUNC_STAT_ISO_STAT_MASK), 1, 10000); |
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if (ret) { |
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dev_err(domain->dev, "pd_on timeout: name: %s, stat: %x\n", genpd->name, val); |
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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 imx93_pd_off(struct generic_pm_domain *genpd) |
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{ |
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struct imx93_power_domain *domain = to_imx93_pd(genpd); |
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void __iomem *addr = domain->addr; |
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int ret; |
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u32 val; |
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/* Power off MIX */ |
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val = readl(addr + MIX_SLICE_SW_CTRL_OFF); |
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val |= SLICE_SW_CTRL_PDN_SOFT_MASK; |
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writel(val, addr + MIX_SLICE_SW_CTRL_OFF); |
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ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val, |
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val & FUNC_STAT_PSW_STAT_MASK, 1, 1000); |
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if (ret) { |
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dev_err(domain->dev, "pd_off timeout: name: %s, stat: %x\n", genpd->name, val); |
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return ret; |
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} |
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clk_bulk_disable_unprepare(domain->num_clks, domain->clks); |
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return 0; |
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}; |
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static int imx93_pd_remove(struct platform_device *pdev) |
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{ |
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struct imx93_power_domain *domain = platform_get_drvdata(pdev); |
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struct device *dev = &pdev->dev; |
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struct device_node *np = dev->of_node; |
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if (!domain->init_off) |
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clk_bulk_disable_unprepare(domain->num_clks, domain->clks); |
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of_genpd_del_provider(np); |
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pm_genpd_remove(&domain->genpd); |
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return 0; |
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} |
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static int imx93_pd_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct device_node *np = dev->of_node; |
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struct imx93_power_domain *domain; |
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int ret; |
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domain = devm_kzalloc(dev, sizeof(*domain), GFP_KERNEL); |
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if (!domain) |
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return -ENOMEM; |
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domain->addr = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(domain->addr)) |
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return PTR_ERR(domain->addr); |
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domain->num_clks = devm_clk_bulk_get_all(dev, &domain->clks); |
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if (domain->num_clks < 0) |
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return dev_err_probe(dev, domain->num_clks, "Failed to get domain's clocks\n"); |
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domain->genpd.name = dev_name(dev); |
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domain->genpd.power_off = imx93_pd_off; |
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domain->genpd.power_on = imx93_pd_on; |
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domain->dev = dev; |
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domain->init_off = readl(domain->addr + MIX_FUNC_STAT_OFF) & FUNC_STAT_ISO_STAT_MASK; |
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/* Just to sync the status of hardware */ |
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if (!domain->init_off) { |
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ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks); |
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if (ret) { |
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dev_err(domain->dev, "failed to enable clocks for domain: %s\n", |
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domain->genpd.name); |
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return ret; |
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} |
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} |
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ret = pm_genpd_init(&domain->genpd, NULL, domain->init_off); |
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if (ret) |
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goto err_clk_unprepare; |
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platform_set_drvdata(pdev, domain); |
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ret = of_genpd_add_provider_simple(np, &domain->genpd); |
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if (ret) |
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goto err_genpd_remove; |
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return 0; |
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err_genpd_remove: |
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pm_genpd_remove(&domain->genpd); |
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err_clk_unprepare: |
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if (!domain->init_off) |
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clk_bulk_disable_unprepare(domain->num_clks, domain->clks); |
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return ret; |
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} |
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static const struct of_device_id imx93_pd_ids[] = { |
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{ .compatible = "fsl,imx93-src-slice" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, imx93_pd_ids); |
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static struct platform_driver imx93_power_domain_driver = { |
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.driver = { |
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.name = "imx93_power_domain", |
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.owner = THIS_MODULE, |
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.of_match_table = imx93_pd_ids, |
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}, |
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.probe = imx93_pd_probe, |
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.remove = imx93_pd_remove, |
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}; |
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module_platform_driver(imx93_power_domain_driver); |
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MODULE_AUTHOR("Peng Fan <[email protected]>"); |
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MODULE_DESCRIPTION("NXP i.MX93 power domain driver"); |
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MODULE_LICENSE("GPL");
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