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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2022 NXP
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#define MIX_SLICE_SW_CTRL_OFF 0x20
#define SLICE_SW_CTRL_PSW_CTRL_OFF_MASK BIT(4)
#define SLICE_SW_CTRL_PDN_SOFT_MASK BIT(31)
#define MIX_FUNC_STAT_OFF 0xB4
#define FUNC_STAT_PSW_STAT_MASK BIT(0)
#define FUNC_STAT_RST_STAT_MASK BIT(2)
#define FUNC_STAT_ISO_STAT_MASK BIT(4)
#define FUNC_STAT_SSAR_STAT_MASK BIT(8)
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");
domain->genpd.name = dev_name(dev);
domain->genpd.power_off = imx93_pd_off;
domain->genpd.power_on = imx93_pd_on;
domain->dev = dev;
init_off = readl(domain->addr + MIX_FUNC_STAT_OFF) & FUNC_STAT_ISO_STAT_MASK;
/* Just to sync the status of hardware */
if (!init_off) {
ret = clk_bulk_prepare_enable(domain->num_clks, domain->clks);
if (ret)
return dev_err_probe(domain->dev, ret,
"failed to enable clocks for domain: %s\n",
domain->genpd.name);
}
ret = pm_genpd_init(&domain->genpd, NULL, init_off);
if (ret)
goto err_clk_unprepare;
platform_set_drvdata(pdev, domain);
ret = of_genpd_add_provider_simple(np, &domain->genpd);
if (ret)
goto err_genpd_remove;
return 0;
err_genpd_remove:
pm_genpd_remove(&domain->genpd);
err_clk_unprepare:
if (!init_off)
clk_bulk_disable_unprepare(domain->num_clks, domain->clks);
return ret;
}
static const struct of_device_id imx93_pd_ids[] = {
{ .compatible = "fsl,imx93-src-slice" },
{ }
};
MODULE_DEVICE_TABLE(of, imx93_pd_ids);
static struct platform_driver imx93_power_domain_driver = {
.driver = {
.name = "imx93_power_domain",
.of_match_table = imx93_pd_ids,
},
.probe = imx93_pd_probe,
.remove = imx93_pd_remove,
};
module_platform_driver(imx93_power_domain_driver);
MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
MODULE_DESCRIPTION("NXP i.MX93 power domain driver");
MODULE_LICENSE("GPL");
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