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Power domains covered by this patch are: - PCIE PHY - MIPI PHY - USB HSIC PHY - USB OTG1/2 PHY Support for any other power domain controlled by GPC is not present, and can be added at some later point. Testing of this code was done against a PCIe driver. Cc: yurovsky@gmail.com Cc: Lucas Stach Cc: Rob Herring Cc: Mark Rutland Cc: Fabio Estevam Cc: devicetree@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Acked-by: Rob Herring Signed-off-by: Andrey Smirnov --- Changes since v3 (see [v3]): - Minor device tree bindings documentation fixes as per feedback from Rob Herring - Collect Acked-by from Rob Changes since v2 (see [v2]): - Fix a critical bug where incorrect state of a bit was expected in a busy wait loop (bit set instead of bit cleared) imx7_gpc_pu_pgc_sw_pxx_req() - Add missing step (setting of PCR in GPC_PGC_nCTRL) in power down procedure Changes since v1 (see [v1]): - Various small DT bindings description fixes as per feedback from Rob Herring [v1] https://lkml.org/lkml/2017/2/6/554 [v2] https://lkml.org/lkml/2017/2/13/489 [v3] https://lkml.org/lkml/2017/2/20/338 .../devicetree/bindings/power/fsl,imx-gpcv2.txt | 71 ++++ drivers/soc/imx/Makefile | 2 +- drivers/soc/imx/gpcv2.c | 397 +++++++++++++++++++++ include/dt-bindings/power/imx7-power.h | 18 + 4 files changed, 487 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/power/fsl,imx-gpcv2.txt create mode 100644 drivers/soc/imx/gpcv2.c create mode 100644 include/dt-bindings/power/imx7-power.h diff --git a/Documentation/devicetree/bindings/power/fsl,imx-gpcv2.txt b/Documentation/devicetree/bindings/power/fsl,imx-gpcv2.txt new file mode 100644 index 0000000..02f45c6 --- /dev/null +++ b/Documentation/devicetree/bindings/power/fsl,imx-gpcv2.txt @@ -0,0 +1,71 @@ +Freescale i.MX General Power Controller v2 +========================================== + +The i.MX7S/D General Power Control (GPC) block contains Power Gating +Control (PGC) for various power domains. + +Required properties: + +- compatible: Should be "fsl,imx7d-gpc" + +- reg: should be register base and length as documented in the + datasheet + +- interrupts: Should contain GPC interrupt request 1 + +Power domains contained within GPC node are generic power domain +providers, documented in +Documentation/devicetree/bindings/power/power_domain.txt, which are +described as subnodes of the power gating controller 'pgc' node, +which, in turn, is expected to contain the following: + +Required properties: + +- reg: Power domain index. Valid values are defined in + include/dt-bindings/power/imx7-power.h + +- #power-domain-cells: Should be 0 + +Optional properties: + +- power-supply: Power supply used to power the domain + +Example: + + gpc: gpc@303a0000 { + compatible = "fsl,imx7d-gpc"; + reg = <0x303a0000 0x1000>; + interrupt-controller; + interrupts = ; + #interrupt-cells = <3>; + interrupt-parent = <&intc>; + + pgc { + #address-cells = <1>; + #size-cells = <0>; + + pgc_pcie_phy: power-domain@3 { + #power-domain-cells = <0>; + + reg = ; + power-supply = <®_1p0d>; + }; + }; + }; + + +Specifying power domain for IP modules +====================================== + +IP cores belonging to a power domain should contain a 'power-domains' +property that is a phandle for PGC node representing the domain. + +Example of a device that is part of the PCIE_PHY power domain: + + pcie: pcie@33800000 { + reg = <0x33800000 0x4000>, + <0x4ff00000 0x80000>; + /* ... */ + power-domains = <&pgc_pcie_phy>; + /* ... */ + }; diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile index 35861f5..7bcc933 100644 --- a/drivers/soc/imx/Makefile +++ b/drivers/soc/imx/Makefile @@ -1 +1 @@ -obj-y += gpc.o +obj-y += gpc.o gpcv2.o diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c new file mode 100644 index 0000000..20f0515 --- /dev/null +++ b/drivers/soc/imx/gpcv2.c @@ -0,0 +1,397 @@ +/* + * Copyright 2017 Impinj, Inc + * Author: Andrey Smirnov + * + * Based on the code of analogus driver: + * + * Copyright 2015-2017 Pengutronix, Lucas Stach + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include + +#define GPC_PGC_CPU_MAPPING 0xec +#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 0xf8 +#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_MAX_REGISTER 0x1000 + +#define GPC_PGC_nCTRL_PCR BIT(0) + +struct imx7_pgc_domain { + struct generic_pm_domain genpd; + struct regmap *regmap; + struct regulator *regulator; + + unsigned int pgc_nctrl; + + 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) +{ + int ret = 0; + unsigned long deadline; + 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 has_regulator = !IS_ERR(domain->regulator); + const bool enable_power_control = domain->pgc_nctrl && !on; + + 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, domain->pgc_nctrl, + GPC_PGC_nCTRL_PCR, GPC_PGC_nCTRL_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, domain->pgc_nctrl, + GPC_PGC_nCTRL_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_USB_HSIC_PHY] = { + .genpd = { + .name = "usb-hsic-phy", + .power_on = imx7_gpc_pu_pgc_sw_pup_req, + .power_off = imx7_gpc_pu_pgc_sw_pdn_req, + }, + .bits = { + .pxx = USB_HSIC_PHY_SW_Pxx_REQ, + .map = USB_HSIC_PHY_A7_DOMAIN, + }, + .voltage = 1200000, + .pgc_nctrl = 0x0d00, + }, + + [IMX7_POWER_DOMAIN_USB_OTG2_PHY] = { + .genpd = { + .name = "usb-otg2-phy", + .power_on = imx7_gpc_pu_pgc_sw_pup_req, + .power_off = imx7_gpc_pu_pgc_sw_pdn_req, + }, + .bits = { + .pxx = USB_OTG2_PHY_SW_Pxx_REQ, + .map = USB_OTG2_PHY_A7_DOMAIN, + }, + }, + + [IMX7_POWER_DOMAIN_USB_OTG1_PHY] = { + .genpd = { + .name = "usb-otg1-phy", + .power_on = imx7_gpc_pu_pgc_sw_pup_req, + .power_off = imx7_gpc_pu_pgc_sw_pdn_req, + }, + .bits = { + .pxx = USB_OTG1_PHY_SW_Pxx_REQ, + .map = USB_OTG1_PHY_A7_DOMAIN, + }, + }, + + [IMX7_POWER_DOMAIN_PCIE_PHY] = { + .genpd = { + .name = "pcie-phy", + .power_on = imx7_gpc_pu_pgc_sw_pup_req, + .power_off = imx7_gpc_pu_pgc_sw_pdn_req, + }, + .bits = { + .pxx = PCIE_PHY_SW_Pxx_REQ, + .map = PCIE_PHY_A7_DOMAIN, + }, + .voltage = 1000000, + .pgc_nctrl = 0x0c40, + }, + + [IMX7_POWER_DOMAIN_MIPI_PHY] = { + .genpd = { + .name = "mipi-phy", + .power_on = imx7_gpc_pu_pgc_sw_pup_req, + .power_off = imx7_gpc_pu_pgc_sw_pdn_req, + }, + .bits = { + .pxx = MIPI_PHY_SW_Pxx_REQ, + .map = MIPI_PHY_A7_DOMAIN, + }, + .voltage = 1000000, + .pgc_nctrl = 0x0c00, + }, +}; + +static int imx7_pgc_domain_probe(struct platform_device *pdev) +{ + int ret; + struct imx7_pgc_domain *domain = pdev->dev.platform_data; + + if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) + return 0; + + 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) && + PTR_ERR(domain->regulator) != -ENODEV) { + dev_err(domain->dev, "Failed to get domain's regulator\n"); + return PTR_ERR(domain->regulator); + } + + if (!IS_ERR(domain->regulator)) { + WARN_ON(!domain->voltage); + 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; + + if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) { + 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 bool imx_gpcv2_readable_reg(struct device *dev, unsigned int reg) +{ + return reg % 4 == 0 && + reg <= GPC_MAX_REGISTER; +} + +static bool imx_gpcv2_volatile_reg(struct device *dev, unsigned int reg) +{ + return reg == GPC_PU_PGC_SW_PUP_REQ || + reg == GPC_PU_PGC_SW_PDN_REQ; +} + +static int imx_gpcv2_probe(struct platform_device *pdev) +{ + int ret; + void __iomem *base; + struct resource *res; + struct regmap *regmap; + struct device *dev = &pdev->dev; + struct device_node *pgc_np, *np; + + static const struct regmap_config regmap_config = { + .cache_type = REGCACHE_FLAT, + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + + .readable_reg = imx_gpcv2_readable_reg, + .volatile_reg = imx_gpcv2_volatile_reg, + + .max_register = GPC_MAX_REGISTER, + }; + + 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, ®map_config); + if (IS_ERR(regmap)) { + ret = PTR_ERR(regmap); + dev_err(dev, "failed to init regmap\n"); + return ret; + } + + for_each_child_of_node(pgc_np, np) { + u32 domain_index; + struct platform_device *pd_pdev; + struct imx7_pgc_domain *domain; + + 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; + + 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) diff --git a/include/dt-bindings/power/imx7-power.h b/include/dt-bindings/power/imx7-power.h new file mode 100644 index 0000000..24dde62 --- /dev/null +++ b/include/dt-bindings/power/imx7-power.h @@ -0,0 +1,18 @@ +/* + * Copyright © 2017 Impinj + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __DT_BINDINGS_ARM_IMX7_POWER_H__ +#define __DT_BINDINGS_ARM_IMX7_POWER_H__ + +#define IMX7_POWER_DOMAIN_USB_HSIC_PHY 0 +#define IMX7_POWER_DOMAIN_USB_OTG2_PHY 1 +#define IMX7_POWER_DOMAIN_USB_OTG1_PHY 2 +#define IMX7_POWER_DOMAIN_PCIE_PHY 3 +#define IMX7_POWER_DOMAIN_MIPI_PHY 4 + +#endif