drivers/pmdomain/imx/imx93-pd.c

Source file repositories/reference/linux-study-clean/drivers/pmdomain/imx/imx93-pd.c

File Facts

System
Linux kernel
Corpus path
drivers/pmdomain/imx/imx93-pd.c
Extension
.c
Size
4387 bytes
Lines
172
Domain
Driver Families
Bucket
drivers/pmdomain
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct imx93_power_domain {
	struct generic_pm_domain genpd;
	struct device *dev;
	void __iomem *addr;
	struct clk_bulk_data *clks;
	int num_clks;
};

#define to_imx93_pd(_genpd) container_of(_genpd, struct imx93_power_domain, genpd)

static int imx93_pd_on(struct generic_pm_domain *genpd)
{
	struct imx93_power_domain *domain = to_imx93_pd(genpd);
	void __iomem *addr = domain->addr;
	u32 val;
	int ret;

	ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks);
	if (ret) {
		dev_err(domain->dev, "failed to enable clocks for domain: %s\n", genpd->name);
		return ret;
	}

	val = readl(addr + MIX_SLICE_SW_CTRL_OFF);
	val &= ~SLICE_SW_CTRL_PDN_SOFT_MASK;
	writel(val, addr + MIX_SLICE_SW_CTRL_OFF);

	ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val,
				 !(val & FUNC_STAT_SSAR_STAT_MASK), 1, 10000);
	if (ret) {
		dev_err(domain->dev, "pd_on timeout: name: %s, stat: %x\n", genpd->name, val);
		return ret;
	}

	return 0;
}

static int imx93_pd_off(struct generic_pm_domain *genpd)
{
	struct imx93_power_domain *domain = to_imx93_pd(genpd);
	void __iomem *addr = domain->addr;
	int ret;
	u32 val;

	/* Power off MIX */
	val = readl(addr + MIX_SLICE_SW_CTRL_OFF);
	val |= SLICE_SW_CTRL_PDN_SOFT_MASK;
	writel(val, addr + MIX_SLICE_SW_CTRL_OFF);

	ret = readl_poll_timeout(addr + MIX_FUNC_STAT_OFF, val,
				 val & FUNC_STAT_PSW_STAT_MASK, 1, 10000);
	if (ret) {
		dev_err(domain->dev, "pd_off timeout: name: %s, stat: %x\n", genpd->name, val);
		return ret;
	}

	clk_bulk_disable_unprepare(domain->num_clks, domain->clks);

	return 0;
};

static void imx93_pd_remove(struct platform_device *pdev)
{
	struct imx93_power_domain *domain = platform_get_drvdata(pdev);
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;

	of_genpd_del_provider(np);
	pm_genpd_remove(&domain->genpd);
}

static int imx93_pd_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct imx93_power_domain *domain;
	bool init_off;
	int ret;

	domain = devm_kzalloc(dev, sizeof(*domain), GFP_KERNEL);
	if (!domain)
		return -ENOMEM;

	domain->addr = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(domain->addr))
		return PTR_ERR(domain->addr);

	domain->num_clks = devm_clk_bulk_get_all(dev, &domain->clks);
	if (domain->num_clks < 0)
		return dev_err_probe(dev, domain->num_clks, "Failed to get domain's clocks\n");

Annotation

Implementation Notes