drivers/soc/imx/gpcv2.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright 2017 Impinj, Inc
  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
  *
  * Based on the code of analogus driver:
  *
  * Copyright 2015-2017 Pengutronix, Lucas Stach <kernel@pengutronix.de>
  *
  * The code contained herein is licensed under the GNU General Public
  * License. You may obtain a copy of the GNU General Public License
  * Version 2 or later at the following locations:
  *
  * http://www.opensource.org/licenses/gpl-license.html
  * http://www.gnu.org/copyleft/gpl.html
  */

 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <dt-bindings/power/imx7-power.h>

 #define GPC_LPCR_A7_BSC			0x000

 #define GPC_PGC_CPU_MAPPING		0x0ec
 #define USB_HSIC_PHY_A7_DOMAIN		BIT(6)
 #define USB_OTG2_PHY_A7_DOMAIN		BIT(5)
 #define USB_OTG1_PHY_A7_DOMAIN		BIT(4)
 #define PCIE_PHY_A7_DOMAIN		BIT(3)
 #define MIPI_PHY_A7_DOMAIN		BIT(2)

 #define GPC_PU_PGC_SW_PUP_REQ		0x0f8
 #define GPC_PU_PGC_SW_PDN_REQ		0x104
 #define USB_HSIC_PHY_SW_Pxx_REQ		BIT(4)
 #define USB_OTG2_PHY_SW_Pxx_REQ		BIT(3)
 #define USB_OTG1_PHY_SW_Pxx_REQ		BIT(2)
 #define PCIE_PHY_SW_Pxx_REQ		BIT(1)
 #define MIPI_PHY_SW_Pxx_REQ		BIT(0)

 #define GPC_M4_PU_PDN_FLG		0x1bc


 #define PGC_MIPI			4
 #define PGC_PCIE			5
 #define PGC_USB_HSIC			8
 #define GPC_PGC_CTRL(n)			(0x800 + (n) * 0x40)
 #define GPC_PGC_SR(n)			(GPC_PGC_CTRL(n) + 0xc)

 #define GPC_PGC_CTRL_PCR		BIT(0)

 struct imx7_pgc_domain {
 	struct generic_pm_domain genpd;
 	struct regmap *regmap;
 	struct regulator *regulator;

 	unsigned int pgc;

 	const struct {
 		u32 pxx;
 		u32 map;
 	} bits;

 	const int voltage;
 	struct device *dev;
 };

 static int imx7_gpc_pu_pgc_sw_pxx_req(struct generic_pm_domain *genpd,
 				      bool on)
 {
 	struct imx7_pgc_domain *domain = container_of(genpd,
 						      struct imx7_pgc_domain,
 						      genpd);
 	unsigned int offset = on ?
 		GPC_PU_PGC_SW_PUP_REQ : GPC_PU_PGC_SW_PDN_REQ;
 	const bool enable_power_control = !on;
 	const bool has_regulator = !IS_ERR(domain->regulator);
 	unsigned long deadline;
 	int ret = 0;

 	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
 			   domain->bits.map, domain->bits.map);

 	if (has_regulator && on) {
 		ret = regulator_enable(domain->regulator);
 		if (ret) {
 			dev_err(domain->dev, "failed to enable regulator\n");
 			goto unmap;
 		}
 	}

 	if (enable_power_control)
 		regmap_update_bits(domain->regmap, GPC_PGC_CTRL(domain->pgc),
 				   GPC_PGC_CTRL_PCR, GPC_PGC_CTRL_PCR);

 	regmap_update_bits(domain->regmap, offset,
 			   domain->bits.pxx, domain->bits.pxx);

 	/*
 	 * As per "5.5.9.4 Example Code 4" in IMX7DRM.pdf wait
 	 * for PUP_REQ/PDN_REQ bit to be cleared
 	 */
 	deadline = jiffies + msecs_to_jiffies(1);
 	while (true) {
 		u32 pxx_req;

 		regmap_read(domain->regmap, offset, &pxx_req);

 		if (!(pxx_req & domain->bits.pxx))
 			break;

 		if (time_after(jiffies, deadline)) {
 			dev_err(domain->dev, "falied to command PGC\n");
 			ret = -ETIMEDOUT;
 			/*
 			 * If we were in a process of enabling a
 			 * domain and failed we might as well disable
 			 * the regulator we just enabled. And if it
 			 * was the opposite situation and we failed to
 			 * power down -- keep the regulator on
 			 */
 			on = !on;
 			break;
 		}

 		cpu_relax();
 	}

 	if (enable_power_control)
 		regmap_update_bits(domain->regmap, GPC_PGC_CTRL(domain->pgc),
 				   GPC_PGC_CTRL_PCR, 0);

 	if (has_regulator && !on) {
 		int err;

 		err = regulator_disable(domain->regulator);
 		if (err)
 			dev_err(domain->dev,
 				"failed to disable regulator: %d\n", ret);
 		/* Preserve earlier error code */
 		ret = ret ?: err;
 	}
 unmap:
 	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
 			   domain->bits.map, 0);
 	return ret;
 }

 static int imx7_gpc_pu_pgc_sw_pup_req(struct generic_pm_domain *genpd)
 {
 	return imx7_gpc_pu_pgc_sw_pxx_req(genpd, true);
 }

 static int imx7_gpc_pu_pgc_sw_pdn_req(struct generic_pm_domain *genpd)
 {
 	return imx7_gpc_pu_pgc_sw_pxx_req(genpd, false);
 }

 static struct imx7_pgc_domain imx7_pgc_domains[] = {
 	[IMX7_POWER_DOMAIN_MIPI_PHY] = {
 		.genpd = {
 			.name      = "mipi-phy",
 		},
 		.bits  = {
 			.pxx = MIPI_PHY_SW_Pxx_REQ,
 			.map = MIPI_PHY_A7_DOMAIN,
 		},
 		.voltage   = 1000000,
 		.pgc	   = PGC_MIPI,
 	},

 	[IMX7_POWER_DOMAIN_PCIE_PHY] = {
 		.genpd = {
 			.name      = "pcie-phy",
 		},
 		.bits  = {
 			.pxx = PCIE_PHY_SW_Pxx_REQ,
 			.map = PCIE_PHY_A7_DOMAIN,
 		},
 		.voltage   = 1000000,
 		.pgc	   = PGC_PCIE,
 	},

 	[IMX7_POWER_DOMAIN_USB_HSIC_PHY] = {
 		.genpd = {
 			.name      = "usb-hsic-phy",
 		},
 		.bits  = {
 			.pxx = USB_HSIC_PHY_SW_Pxx_REQ,
 			.map = USB_HSIC_PHY_A7_DOMAIN,
 		},
 		.voltage   = 1200000,
 		.pgc	   = PGC_USB_HSIC,
 	},
 };

 static int imx7_pgc_domain_probe(struct platform_device *pdev)
 {
 	struct imx7_pgc_domain *domain = pdev->dev.platform_data;
 	int ret;

 	domain->dev = &pdev->dev;

 	ret = pm_genpd_init(&domain->genpd, NULL, true);
 	if (ret) {
 		dev_err(domain->dev, "Failed to init power domain\n");
 		return ret;
 	}

 	domain->regulator = devm_regulator_get_optional(domain->dev, "power");
 	if (IS_ERR(domain->regulator)) {
 		if (PTR_ERR(domain->regulator) != -ENODEV) {
 			dev_err(domain->dev, "Failed to get domain's regulator\n");
 			return PTR_ERR(domain->regulator);
 		}
 	} else {
 		regulator_set_voltage(domain->regulator,
 				      domain->voltage, domain->voltage);
 	}

 	ret = of_genpd_add_provider_simple(domain->dev->of_node,
 					   &domain->genpd);
 	if (ret) {
 		dev_err(domain->dev, "Failed to add genpd provider\n");
 		pm_genpd_remove(&domain->genpd);
 	}

 	return ret;
 }

 static int imx7_pgc_domain_remove(struct platform_device *pdev)
 {
 	struct imx7_pgc_domain *domain = pdev->dev.platform_data;

 	of_genpd_del_provider(domain->dev->of_node);
 	pm_genpd_remove(&domain->genpd);

 	return 0;
 }

 static const struct platform_device_id imx7_pgc_domain_id[] = {
 	{ "imx7-pgc-domain", },
 	{ },
 };

 static struct platform_driver imx7_pgc_domain_driver = {
 	.driver = {
 		.name = "imx7-pgc",
 	},
 	.probe    = imx7_pgc_domain_probe,
 	.remove   = imx7_pgc_domain_remove,
 	.id_table = imx7_pgc_domain_id,
 };
 builtin_platform_driver(imx7_pgc_domain_driver)

 static int imx_gpcv2_probe(struct platform_device *pdev)
 {
 	static const struct regmap_range yes_ranges[] = {
 		regmap_reg_range(GPC_LPCR_A7_BSC,
 				 GPC_M4_PU_PDN_FLG),
 		regmap_reg_range(GPC_PGC_CTRL(PGC_MIPI),
 				 GPC_PGC_SR(PGC_MIPI)),
 		regmap_reg_range(GPC_PGC_CTRL(PGC_PCIE),
 				 GPC_PGC_SR(PGC_PCIE)),
 		regmap_reg_range(GPC_PGC_CTRL(PGC_USB_HSIC),
 				 GPC_PGC_SR(PGC_USB_HSIC)),
 	};
 	static const struct regmap_access_table access_table = {
 		.yes_ranges	= yes_ranges,
 		.n_yes_ranges	= ARRAY_SIZE(yes_ranges),
 	};
 	static const struct regmap_config regmap_config = {
 		.reg_bits	= 32,
 		.val_bits	= 32,
 		.reg_stride	= 4,
 		.rd_table	= &access_table,
 		.wr_table	= &access_table,
 		.max_register   = SZ_4K,
 	};
 	struct device *dev = &pdev->dev;
 	struct device_node *pgc_np, *np;
 	struct regmap *regmap;
 	struct resource *res;
 	void __iomem *base;
 	int ret;

 	pgc_np = of_get_child_by_name(dev->of_node, "pgc");
 	if (!pgc_np) {
 		dev_err(dev, "No power domains specified in DT\n");
 		return -EINVAL;
 	}

 	res  = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);

 	regmap = devm_regmap_init_mmio(dev, base, &regmap_config);
 	if (IS_ERR(regmap)) {
 		ret = PTR_ERR(regmap);
 		dev_err(dev, "failed to init regmap (%d)\n", ret);
 		return ret;
 	}

 	for_each_child_of_node(pgc_np, np) {
 		struct platform_device *pd_pdev;
 		struct imx7_pgc_domain *domain;
 		u32 domain_index;

 		ret = of_property_read_u32(np, "reg", &domain_index);
 		if (ret) {
 			dev_err(dev, "Failed to read 'reg' property\n");
 			of_node_put(np);
 			return ret;
 		}

 		if (domain_index >= ARRAY_SIZE(imx7_pgc_domains)) {
 			dev_warn(dev,
 				 "Domain index %d is out of bounds\n",
 				 domain_index);
 			continue;
 		}

 		domain = &imx7_pgc_domains[domain_index];
 		domain->regmap = regmap;
 		domain->genpd.power_on  = imx7_gpc_pu_pgc_sw_pup_req;
 		domain->genpd.power_off = imx7_gpc_pu_pgc_sw_pdn_req;

 		pd_pdev = platform_device_alloc("imx7-pgc-domain",
 						domain_index);
 		if (!pd_pdev) {
 			dev_err(dev, "Failed to allocate platform device\n");
 			of_node_put(np);
 			return -ENOMEM;
 		}

 		pd_pdev->dev.platform_data = domain;
 		pd_pdev->dev.parent = dev;
 		pd_pdev->dev.of_node = np;

 		ret = platform_device_add(pd_pdev);
 		if (ret) {
 			platform_device_put(pd_pdev);
 			of_node_put(np);
 			return ret;
 		}
 	}

 	return 0;
 }

 static const struct of_device_id imx_gpcv2_dt_ids[] = {
 	{ .compatible = "fsl,imx7d-gpc" },
 	{ }
 };

 static struct platform_driver imx_gpc_driver = {
 	.driver = {
 		.name = "imx-gpcv2",
 		.of_match_table = imx_gpcv2_dt_ids,
 	},
 	.probe = imx_gpcv2_probe,
 };
 builtin_platform_driver(imx_gpc_driver)
	/*
	* Copyright 2017 Impinj, Inc
	* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
	*
	* Based on the code of analogus driver:
	*
	* Copyright 2015-2017 Pengutronix, Lucas Stach <kernel@pengutronix.de>
	*
	* The code contained herein is licensed under the GNU General Public
	* License. You may obtain a copy of the GNU General Public License
	* Version 2 or later at the following locations:
	*
	* http://www.opensource.org/licenses/gpl-license.html
	* http://www.gnu.org/copyleft/gpl.html
	*/

	#include <linux/platform_device.h>
	#include <linux/pm_domain.h>
	#include <linux/regmap.h>
	#include <linux/regulator/consumer.h>
	#include <dt-bindings/power/imx7-power.h>

	#define GPC_LPCR_A7_BSC 0x000

	#define GPC_PGC_CPU_MAPPING 0x0ec
	#define USB_HSIC_PHY_A7_DOMAIN BIT(6)
	#define USB_OTG2_PHY_A7_DOMAIN BIT(5)
	#define USB_OTG1_PHY_A7_DOMAIN BIT(4)
	#define PCIE_PHY_A7_DOMAIN BIT(3)
	#define MIPI_PHY_A7_DOMAIN BIT(2)

	#define GPC_PU_PGC_SW_PUP_REQ 0x0f8
	#define GPC_PU_PGC_SW_PDN_REQ 0x104
	#define USB_HSIC_PHY_SW_Pxx_REQ BIT(4)
	#define USB_OTG2_PHY_SW_Pxx_REQ BIT(3)
	#define USB_OTG1_PHY_SW_Pxx_REQ BIT(2)
	#define PCIE_PHY_SW_Pxx_REQ BIT(1)
	#define MIPI_PHY_SW_Pxx_REQ BIT(0)

	#define GPC_M4_PU_PDN_FLG 0x1bc


	#define PGC_MIPI 4
	#define PGC_PCIE 5
	#define PGC_USB_HSIC 8
	#define GPC_PGC_CTRL(n) (0x800 + (n) * 0x40)
	#define GPC_PGC_SR(n) (GPC_PGC_CTRL(n) + 0xc)

	#define GPC_PGC_CTRL_PCR BIT(0)

	struct imx7_pgc_domain {
	struct generic_pm_domain genpd;
	struct regmap *regmap;
	struct regulator *regulator;

	unsigned int pgc;

	const struct {
	u32 pxx;
	u32 map;
	} bits;

	const int voltage;
	struct device *dev;
	};

	static int imx7_gpc_pu_pgc_sw_pxx_req(struct generic_pm_domain *genpd,
	bool on)
	{
	struct imx7_pgc_domain *domain = container_of(genpd,
	struct imx7_pgc_domain,
	genpd);
	unsigned int offset = on ?
	GPC_PU_PGC_SW_PUP_REQ : GPC_PU_PGC_SW_PDN_REQ;
	const bool enable_power_control = !on;
	const bool has_regulator = !IS_ERR(domain->regulator);
	unsigned long deadline;
	int ret = 0;

	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
	domain->bits.map, domain->bits.map);

	if (has_regulator && on) {
	ret = regulator_enable(domain->regulator);
	if (ret) {
	dev_err(domain->dev, "failed to enable regulator\n");
	goto unmap;
	}
	}

	if (enable_power_control)
	regmap_update_bits(domain->regmap, GPC_PGC_CTRL(domain->pgc),
	GPC_PGC_CTRL_PCR, GPC_PGC_CTRL_PCR);

	regmap_update_bits(domain->regmap, offset,
	domain->bits.pxx, domain->bits.pxx);

	/*
	* As per "5.5.9.4 Example Code 4" in IMX7DRM.pdf wait
	* for PUP_REQ/PDN_REQ bit to be cleared
	*/
	deadline = jiffies + msecs_to_jiffies(1);
	while (true) {
	u32 pxx_req;

	regmap_read(domain->regmap, offset, &pxx_req);

	if (!(pxx_req & domain->bits.pxx))
	break;

	if (time_after(jiffies, deadline)) {
	dev_err(domain->dev, "falied to command PGC\n");
	ret = -ETIMEDOUT;
	/*
	* If we were in a process of enabling a
	* domain and failed we might as well disable
	* the regulator we just enabled. And if it
	* was the opposite situation and we failed to
	* power down -- keep the regulator on
	*/
	on = !on;
	break;
	}

	cpu_relax();
	}

	if (enable_power_control)
	regmap_update_bits(domain->regmap, GPC_PGC_CTRL(domain->pgc),
	GPC_PGC_CTRL_PCR, 0);

	if (has_regulator && !on) {
	int err;

	err = regulator_disable(domain->regulator);
	if (err)
	dev_err(domain->dev,
	"failed to disable regulator: %d\n", ret);
	/* Preserve earlier error code */
	ret = ret ?: err;
	}
	unmap:
	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
	domain->bits.map, 0);
	return ret;
	}

	static int imx7_gpc_pu_pgc_sw_pup_req(struct generic_pm_domain *genpd)
	{
	return imx7_gpc_pu_pgc_sw_pxx_req(genpd, true);
	}

	static int imx7_gpc_pu_pgc_sw_pdn_req(struct generic_pm_domain *genpd)
	{
	return imx7_gpc_pu_pgc_sw_pxx_req(genpd, false);
	}

	static struct imx7_pgc_domain imx7_pgc_domains[] = {
	[IMX7_POWER_DOMAIN_MIPI_PHY] = {
	.genpd = {
	.name = "mipi-phy",
	},
	.bits = {
	.pxx = MIPI_PHY_SW_Pxx_REQ,
	.map = MIPI_PHY_A7_DOMAIN,
	},
	.voltage = 1000000,
	.pgc = PGC_MIPI,
	},

	[IMX7_POWER_DOMAIN_PCIE_PHY] = {
	.genpd = {
	.name = "pcie-phy",
	},
	.bits = {
	.pxx = PCIE_PHY_SW_Pxx_REQ,
	.map = PCIE_PHY_A7_DOMAIN,
	},
	.voltage = 1000000,
	.pgc = PGC_PCIE,
	},

	[IMX7_POWER_DOMAIN_USB_HSIC_PHY] = {
	.genpd = {
	.name = "usb-hsic-phy",
	},
	.bits = {
	.pxx = USB_HSIC_PHY_SW_Pxx_REQ,
	.map = USB_HSIC_PHY_A7_DOMAIN,
	},
	.voltage = 1200000,
	.pgc = PGC_USB_HSIC,
	},
	};

	static int imx7_pgc_domain_probe(struct platform_device *pdev)
	{
	struct imx7_pgc_domain *domain = pdev->dev.platform_data;
	int ret;

	domain->dev = &pdev->dev;

	ret = pm_genpd_init(&domain->genpd, NULL, true);
	if (ret) {
	dev_err(domain->dev, "Failed to init power domain\n");
	return ret;
	}

	domain->regulator = devm_regulator_get_optional(domain->dev, "power");
	if (IS_ERR(domain->regulator)) {
	if (PTR_ERR(domain->regulator) != -ENODEV) {
	dev_err(domain->dev, "Failed to get domain's regulator\n");
	return PTR_ERR(domain->regulator);
	}
	} else {
	regulator_set_voltage(domain->regulator,
	domain->voltage, domain->voltage);
	}

	ret = of_genpd_add_provider_simple(domain->dev->of_node,
	&domain->genpd);
	if (ret) {
	dev_err(domain->dev, "Failed to add genpd provider\n");
	pm_genpd_remove(&domain->genpd);
	}

	return ret;
	}

	static int imx7_pgc_domain_remove(struct platform_device *pdev)
	{
	struct imx7_pgc_domain *domain = pdev->dev.platform_data;

	of_genpd_del_provider(domain->dev->of_node);
	pm_genpd_remove(&domain->genpd);

	return 0;
	}

	static const struct platform_device_id imx7_pgc_domain_id[] = {
	{ "imx7-pgc-domain", },
	{ },
	};

	static struct platform_driver imx7_pgc_domain_driver = {
	.driver = {
	.name = "imx7-pgc",
	},
	.probe = imx7_pgc_domain_probe,
	.remove = imx7_pgc_domain_remove,
	.id_table = imx7_pgc_domain_id,
	};
	builtin_platform_driver(imx7_pgc_domain_driver)

	static int imx_gpcv2_probe(struct platform_device *pdev)
	{
	static const struct regmap_range yes_ranges[] = {
	regmap_reg_range(GPC_LPCR_A7_BSC,
	GPC_M4_PU_PDN_FLG),
	regmap_reg_range(GPC_PGC_CTRL(PGC_MIPI),
	GPC_PGC_SR(PGC_MIPI)),
	regmap_reg_range(GPC_PGC_CTRL(PGC_PCIE),
	GPC_PGC_SR(PGC_PCIE)),
	regmap_reg_range(GPC_PGC_CTRL(PGC_USB_HSIC),
	GPC_PGC_SR(PGC_USB_HSIC)),
	};
	static const struct regmap_access_table access_table = {
	.yes_ranges = yes_ranges,
	.n_yes_ranges = ARRAY_SIZE(yes_ranges),
	};
	static const struct regmap_config regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	.rd_table = &access_table,
	.wr_table = &access_table,
	.max_register = SZ_4K,
	};
	struct device *dev = &pdev->dev;
	struct device_node pgc_np, np;
	struct regmap *regmap;
	struct resource *res;
	void __iomem *base;
	int ret;

	pgc_np = of_get_child_by_name(dev->of_node, "pgc");
	if (!pgc_np) {
	dev_err(dev, "No power domains specified in DT\n");
	return -EINVAL;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
	return PTR_ERR(base);

	regmap = devm_regmap_init_mmio(dev, base, &regmap_config);
	if (IS_ERR(regmap)) {
	ret = PTR_ERR(regmap);
	dev_err(dev, "failed to init regmap (%d)\n", ret);
	return ret;
	}

	for_each_child_of_node(pgc_np, np) {
	struct platform_device *pd_pdev;
	struct imx7_pgc_domain *domain;
	u32 domain_index;

	ret = of_property_read_u32(np, "reg", &domain_index);
	if (ret) {
	dev_err(dev, "Failed to read 'reg' property\n");
	of_node_put(np);
	return ret;
	}

	if (domain_index >= ARRAY_SIZE(imx7_pgc_domains)) {
	dev_warn(dev,
	"Domain index %d is out of bounds\n",
	domain_index);
	continue;
	}

	domain = &imx7_pgc_domains[domain_index];
	domain->regmap = regmap;
	domain->genpd.power_on = imx7_gpc_pu_pgc_sw_pup_req;
	domain->genpd.power_off = imx7_gpc_pu_pgc_sw_pdn_req;

	pd_pdev = platform_device_alloc("imx7-pgc-domain",
	domain_index);
	if (!pd_pdev) {
	dev_err(dev, "Failed to allocate platform device\n");
	of_node_put(np);
	return -ENOMEM;
	}

	pd_pdev->dev.platform_data = domain;
	pd_pdev->dev.parent = dev;
	pd_pdev->dev.of_node = np;

	ret = platform_device_add(pd_pdev);
	if (ret) {
	platform_device_put(pd_pdev);
	of_node_put(np);
	return ret;
	}
	}

	return 0;
	}

	static const struct of_device_id imx_gpcv2_dt_ids[] = {
	{ .compatible = "fsl,imx7d-gpc" },
	{ }
	};

	static struct platform_driver imx_gpc_driver = {
	.driver = {
	.name = "imx-gpcv2",
	.of_match_table = imx_gpcv2_dt_ids,
	},
	.probe = imx_gpcv2_probe,
	};
	builtin_platform_driver(imx_gpc_driver)