From 0fb32ea7e39ebb067920ac7e58b0b2764e38aa28 Mon Sep 17 00:00:00 2001 From: Andrey Smirnov Date: Wed, 16 Jan 2019 18:16:51 -0800 Subject: soc: imx: Add GPCv2 power gating driver Port of a Linux commit 03aa12629fc4f73acf28e519c9ee9cb1f5dd3706 Add code allowing for control of various power domains managed by GPCv2 IP block found in i.MX7 series of SoCs. 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: Fabio Estevam Cc: Dong Aisheng Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Andrey Smirnov Signed-off-by: Shawn Guo Linux commit 9e01e2d56db23485a75864b6aeee8e443f024ddb was squashed here as well: soc: imx: gpcv2: fix regulator deferred probe If a regulator requests a deferred probe, the power domain gets initialized twice. This leads to a list double add (without list debugging the kernel hangs due to the double add later): WARNING: CPU: 0 PID: 19 at lib/list_debug.c:31 __list_add_valid+0xbc/0xc4 list_add double add: new=c1229754, prev=c12383b4, next=c1229754. Initialize the power domain after we get the regulator. Also do not print an error in case the regulator defers probing. Cc: Fabio Estevam Cc: Andrey Smirnov Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Fixes: 03aa12629fc4 ("soc: imx: Add GPCv2 power gating driver") Signed-off-by: Stefan Agner Acked-by: Andrey Smirnov Tested-by: Andrey Smirnov Signed-off-by: Shawn Guo Linux commit 3637f12faf507b0a4b8ac1e7115fc99583ab1db3 was squashed here as well soc: imx: gpcv2: correct PGC offset Correct MIPI/PCIe/USB_HSIC's PGC offset based on design RTL, the values in the Reference Manual (Rev. 1, 01/2018 and the older ones) are incorrect. The correct offset values should be as below: 0x800 ~ 0x83F: PGC for core0 of A7 platform; 0x840 ~ 0x87F: PGC for core1 of A7 platform; 0x880 ~ 0x8BF: PGC for SCU of A7 platform; 0xA00 ~ 0xA3F: PGC for fastmix/megamix; 0xC00 ~ 0xC3F: PGC for MIPI PHY; 0xC40 ~ 0xC7F: PGC for PCIe_PHY; 0xC80 ~ 0xCBF: PGC for USB OTG1 PHY; 0xCC0 ~ 0xCFF: PGC for USB OTG2 PHY; 0xD00 ~ 0xD3F: PGC for USB HSIC PHY; Signed-off-by: Anson Huang Fixes: 03aa12629fc4 ("soc: imx: Add GPCv2 power gating driver") Acked-by: Andrey Smirnov Reviewed-by: Fabio Estevam Signed-off-by: Shawn Guo Signed-off-by: Andrey Smirnov Signed-off-by: Sascha Hauer --- drivers/soc/imx/Kconfig | 9 ++ drivers/soc/imx/Makefile | 1 + drivers/soc/imx/gpcv2.c | 315 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 325 insertions(+) create mode 100644 drivers/soc/imx/Kconfig create mode 100644 drivers/soc/imx/Makefile create mode 100644 drivers/soc/imx/gpcv2.c (limited to 'drivers/soc') diff --git a/drivers/soc/imx/Kconfig b/drivers/soc/imx/Kconfig new file mode 100644 index 0000000000..a78a9e3967 --- /dev/null +++ b/drivers/soc/imx/Kconfig @@ -0,0 +1,9 @@ +menu "i.MX SoC drivers" + +config IMX7_PM_DOMAINS + bool "i.MX7 PM domains" + depends on ARCH_IMX7 + select PM_GENERIC_DOMAINS + default y if ARCH_IMX7 + +endmenu diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile new file mode 100644 index 0000000000..b039f77dc1 --- /dev/null +++ b/drivers/soc/imx/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_IMX7_PM_DOMAINS) += gpcv2.o diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c new file mode 100644 index 0000000000..158bfc02de --- /dev/null +++ b/drivers/soc/imx/gpcv2.c @@ -0,0 +1,315 @@ +/* + * 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 +#include + +#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 + +/* + * The PGC offset values in Reference Manual + * (Rev. 1, 01/2018 and the older ones) GPC chapter's + * GPC_PGC memory map are incorrect, below offset + * values are from design RTL. + */ +#define PGC_MIPI 16 +#define PGC_PCIE 17 +#define PGC_USB_HSIC 20 +#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; + void __iomem *base; + struct regulator *regulator; + + unsigned int pgc; + + const struct { + u32 pxx; + u32 map; + } bits; + + const int voltage; + struct device_d *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); + int ret = 0; + unsigned int mapping, ctrl = 0, pxx; + + mapping = readl(domain->base + GPC_PGC_CPU_MAPPING); + mapping |= domain->bits.map; + writel(mapping, domain->base + GPC_PGC_CPU_MAPPING); + + 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) { + ctrl = readl(domain->base + GPC_PGC_CTRL(domain->pgc)); + ctrl |= GPC_PGC_CTRL_PCR; + writel(ctrl, domain->base + GPC_PGC_CTRL(domain->pgc)); + } + + pxx = readl(domain->base + offset); + pxx |= domain->bits.pxx; + writel(pxx, domain->base + offset); + + /* + * As per "5.5.9.4 Example Code 4" in IMX7DRM.pdf wait + * for PUP_REQ/PDN_REQ bit to be cleared + */ + ret = readl_poll_timeout(domain->base + offset, pxx, + !(pxx & domain->bits.pxx), MSECOND); + if (ret < 0) { + dev_err(domain->dev, "falied to command PGC\n"); + /* + * 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; + } + + if (enable_power_control) { + ctrl &= ~GPC_PGC_CTRL_PCR; + writel(ctrl, domain->base + GPC_PGC_CTRL(domain->pgc)); + } + + 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: + mapping &= ~domain->bits.map; + writel(mapping, domain->base + GPC_PGC_CPU_MAPPING); + + 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 const 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 device_d *dev) +{ + struct imx7_pgc_domain *domain = dev->priv; + int ret; + + domain->dev = dev; + + domain->regulator = regulator_get(domain->dev, "power"); + if (IS_ERR(domain->regulator)) { + if (PTR_ERR(domain->regulator) != -ENODEV) { + if (PTR_ERR(domain->regulator) != -EPROBE_DEFER) + 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 = pm_genpd_init(&domain->genpd, NULL, true); + if (ret) { + dev_err(domain->dev, "Failed to init power domain\n"); + return ret; + } + + ret = of_genpd_add_provider_simple(domain->dev->device_node, + &domain->genpd); + if (ret) { + dev_err(domain->dev, "Failed to add genpd provider\n"); + } + + return ret; +} + +static const struct platform_device_id imx7_pgc_domain_id[] = { + { "imx7-pgc-domain", }, + { }, +}; + +static struct driver_d imx7_pgc_domain_driver = { + .name = "imx-pgc", + .probe = imx7_pgc_domain_probe, + .id_table = imx7_pgc_domain_id, +}; +coredevice_platform_driver(imx7_pgc_domain_driver); + +static int imx_gpcv2_probe(struct device_d *dev) +{ + struct device_node *pgc_np, *np; + struct resource *res; + void __iomem *base; + int ret; + + pgc_np = of_get_child_by_name(dev->device_node, "pgc"); + if (!pgc_np) { + dev_err(dev, "No power domains specified in DT\n"); + return -EINVAL; + } + + res = dev_request_mem_resource(dev, 0); + if (IS_ERR(res)) + return PTR_ERR(res); + + base = IOMEM(res->start); + + for_each_child_of_node(pgc_np, np) { + struct device_d *pd_dev; + 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"); + 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 = xmemdup(&imx7_pgc_domains[domain_index], + sizeof(imx7_pgc_domains[domain_index])); + domain->base = base; + domain->genpd.power_on = imx7_gpc_pu_pgc_sw_pup_req; + domain->genpd.power_off = imx7_gpc_pu_pgc_sw_pdn_req; + + pd_dev = xzalloc(sizeof(*pd_dev)); + pd_dev->device_node = np; + pd_dev->id = domain_index; + pd_dev->parent = dev; + pd_dev->priv = domain; + pd_dev->device_node = np; + dev_set_name(pd_dev, imx7_pgc_domain_id[0].name); + + ret = platform_device_register(pd_dev); + if (ret) + return ret; + } + + return 0; +} + +static const struct of_device_id imx_gpcv2_dt_ids[] = { + { .compatible = "fsl,imx7d-gpc" }, + { } +}; + +static struct driver_d imx_gpcv2_driver = { + .name = "imx7d-gpc", + .probe = imx_gpcv2_probe, + .of_compatible = DRV_OF_COMPAT(imx_gpcv2_dt_ids), +}; +coredevice_platform_driver(imx_gpcv2_driver); -- cgit v1.2.3