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soc: imx: add i.MX8MP HSIO blk-ctrl
The i.MX8MP added some blk-ctrl peripherals that don't follow the regular structure of the blk-ctrls in the previous SoCs. Add a new file for those with currently only the HSIO blk-ctrl being supported. Others will be added later on. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Lucas Stach
Shawn Guo
parent
a0c756681b
commit
556f5cf956
@ -6,3 +6,4 @@ obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
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obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
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obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o
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obj-$(CONFIG_SOC_IMX8M) += imx8m-blk-ctrl.o
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obj-$(CONFIG_SOC_IMX8M) += imx8mp-blk-ctrl.o
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503
drivers/soc/imx/imx8mp-blk-ctrl.c
Normal file
503
drivers/soc/imx/imx8mp-blk-ctrl.c
Normal file
@ -0,0 +1,503 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2022 Pengutronix, Lucas Stach <kernel@pengutronix.de>
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_runtime.h>
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#include <linux/regmap.h>
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#include <dt-bindings/power/imx8mp-power.h>
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#define GPR_REG0 0x0
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#define PCIE_CLOCK_MODULE_EN BIT(0)
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#define USB_CLOCK_MODULE_EN BIT(1)
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struct imx8mp_blk_ctrl_domain;
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struct imx8mp_blk_ctrl {
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struct device *dev;
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struct notifier_block power_nb;
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struct device *bus_power_dev;
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struct regmap *regmap;
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struct imx8mp_blk_ctrl_domain *domains;
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struct genpd_onecell_data onecell_data;
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void (*power_off) (struct imx8mp_blk_ctrl *bc, struct imx8mp_blk_ctrl_domain *domain);
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void (*power_on) (struct imx8mp_blk_ctrl *bc, struct imx8mp_blk_ctrl_domain *domain);
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};
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struct imx8mp_blk_ctrl_domain_data {
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const char *name;
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const char * const *clk_names;
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int num_clks;
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const char *gpc_name;
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};
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#define DOMAIN_MAX_CLKS 2
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struct imx8mp_blk_ctrl_domain {
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struct generic_pm_domain genpd;
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const struct imx8mp_blk_ctrl_domain_data *data;
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struct clk_bulk_data clks[DOMAIN_MAX_CLKS];
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struct device *power_dev;
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struct imx8mp_blk_ctrl *bc;
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int id;
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};
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struct imx8mp_blk_ctrl_data {
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int max_reg;
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notifier_fn_t power_notifier_fn;
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void (*power_off) (struct imx8mp_blk_ctrl *bc, struct imx8mp_blk_ctrl_domain *domain);
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void (*power_on) (struct imx8mp_blk_ctrl *bc, struct imx8mp_blk_ctrl_domain *domain);
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const struct imx8mp_blk_ctrl_domain_data *domains;
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int num_domains;
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};
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static inline struct imx8mp_blk_ctrl_domain *
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to_imx8mp_blk_ctrl_domain(struct generic_pm_domain *genpd)
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{
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return container_of(genpd, struct imx8mp_blk_ctrl_domain, genpd);
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}
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static void imx8mp_hsio_blk_ctrl_power_on(struct imx8mp_blk_ctrl *bc,
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struct imx8mp_blk_ctrl_domain *domain)
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{
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switch (domain->id) {
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case IMX8MP_HSIOBLK_PD_USB:
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regmap_set_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
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break;
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case IMX8MP_HSIOBLK_PD_PCIE:
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regmap_set_bits(bc->regmap, GPR_REG0, PCIE_CLOCK_MODULE_EN);
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break;
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default:
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break;
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}
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}
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static void imx8mp_hsio_blk_ctrl_power_off(struct imx8mp_blk_ctrl *bc,
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struct imx8mp_blk_ctrl_domain *domain)
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{
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switch (domain->id) {
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case IMX8MP_HSIOBLK_PD_USB:
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regmap_clear_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
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break;
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case IMX8MP_HSIOBLK_PD_PCIE:
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regmap_clear_bits(bc->regmap, GPR_REG0, PCIE_CLOCK_MODULE_EN);
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break;
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default:
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break;
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}
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}
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static int imx8mp_hsio_power_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct imx8mp_blk_ctrl *bc = container_of(nb, struct imx8mp_blk_ctrl,
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power_nb);
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struct clk_bulk_data *usb_clk = bc->domains[IMX8MP_HSIOBLK_PD_USB].clks;
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int num_clks = bc->domains[IMX8MP_HSIOBLK_PD_USB].data->num_clks;
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int ret;
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switch (action) {
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case GENPD_NOTIFY_ON:
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/*
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* enable USB clock for a moment for the power-on ADB handshake
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* to proceed
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*/
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ret = clk_bulk_prepare_enable(num_clks, usb_clk);
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if (ret)
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return NOTIFY_BAD;
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regmap_set_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
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udelay(5);
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regmap_clear_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
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clk_bulk_disable_unprepare(num_clks, usb_clk);
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break;
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case GENPD_NOTIFY_PRE_OFF:
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/* enable USB clock for the power-down ADB handshake to work */
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ret = clk_bulk_prepare_enable(num_clks, usb_clk);
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if (ret)
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return NOTIFY_BAD;
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regmap_set_bits(bc->regmap, GPR_REG0, USB_CLOCK_MODULE_EN);
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break;
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case GENPD_NOTIFY_OFF:
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clk_bulk_disable_unprepare(num_clks, usb_clk);
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break;
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default:
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break;
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}
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return NOTIFY_OK;
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}
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static const struct imx8mp_blk_ctrl_domain_data imx8mp_hsio_domain_data[] = {
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[IMX8MP_HSIOBLK_PD_USB] = {
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.name = "hsioblk-usb",
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.clk_names = (const char *[]){ "usb" },
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.num_clks = 1,
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.gpc_name = "usb",
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},
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[IMX8MP_HSIOBLK_PD_USB_PHY1] = {
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.name = "hsioblk-usb-phy1",
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.gpc_name = "usb-phy1",
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},
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[IMX8MP_HSIOBLK_PD_USB_PHY2] = {
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.name = "hsioblk-usb-phy2",
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.gpc_name = "usb-phy2",
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},
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[IMX8MP_HSIOBLK_PD_PCIE] = {
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.name = "hsioblk-pcie",
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.clk_names = (const char *[]){ "pcie" },
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.num_clks = 1,
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.gpc_name = "pcie",
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},
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[IMX8MP_HSIOBLK_PD_PCIE_PHY] = {
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.name = "hsioblk-pcie-phy",
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.gpc_name = "pcie-phy",
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},
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};
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static const struct imx8mp_blk_ctrl_data imx8mp_hsio_blk_ctl_dev_data = {
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.max_reg = 0x24,
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.power_on = imx8mp_hsio_blk_ctrl_power_on,
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.power_off = imx8mp_hsio_blk_ctrl_power_off,
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.power_notifier_fn = imx8mp_hsio_power_notifier,
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.domains = imx8mp_hsio_domain_data,
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.num_domains = ARRAY_SIZE(imx8mp_hsio_domain_data),
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};
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static int imx8mp_blk_ctrl_power_on(struct generic_pm_domain *genpd)
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{
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struct imx8mp_blk_ctrl_domain *domain = to_imx8mp_blk_ctrl_domain(genpd);
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const struct imx8mp_blk_ctrl_domain_data *data = domain->data;
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struct imx8mp_blk_ctrl *bc = domain->bc;
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int ret;
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/* make sure bus domain is awake */
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ret = pm_runtime_resume_and_get(bc->bus_power_dev);
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if (ret < 0) {
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dev_err(bc->dev, "failed to power up bus domain\n");
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return ret;
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}
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/* enable upstream clocks */
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ret = clk_bulk_prepare_enable(data->num_clks, domain->clks);;
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if (ret) {
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dev_err(bc->dev, "failed to enable clocks\n");
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goto bus_put;
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}
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/* domain specific blk-ctrl manipulation */
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bc->power_on(bc, domain);
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/* power up upstream GPC domain */
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ret = pm_runtime_resume_and_get(domain->power_dev);
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if (ret < 0) {
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dev_err(bc->dev, "failed to power up peripheral domain\n");
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goto clk_disable;
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}
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clk_bulk_disable_unprepare(data->num_clks, domain->clks);
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return 0;
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clk_disable:
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clk_bulk_disable_unprepare(data->num_clks, domain->clks);
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bus_put:
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pm_runtime_put(bc->bus_power_dev);
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return ret;
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}
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static int imx8mp_blk_ctrl_power_off(struct generic_pm_domain *genpd)
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{
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struct imx8mp_blk_ctrl_domain *domain = to_imx8mp_blk_ctrl_domain(genpd);
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const struct imx8mp_blk_ctrl_domain_data *data = domain->data;
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struct imx8mp_blk_ctrl *bc = domain->bc;
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int ret;
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ret = clk_bulk_prepare_enable(data->num_clks, domain->clks);;
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if (ret) {
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dev_err(bc->dev, "failed to enable clocks\n");
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return ret;
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}
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/* domain specific blk-ctrl manipulation */
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bc->power_off(bc, domain);
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clk_bulk_disable_unprepare(data->num_clks, domain->clks);
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/* power down upstream GPC domain */
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pm_runtime_put(domain->power_dev);
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/* allow bus domain to suspend */
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pm_runtime_put(bc->bus_power_dev);
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return 0;
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}
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static struct generic_pm_domain *
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imx8m_blk_ctrl_xlate(struct of_phandle_args *args, void *data)
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{
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struct genpd_onecell_data *onecell_data = data;
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unsigned int index = args->args[0];
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if (args->args_count != 1 ||
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index >= onecell_data->num_domains)
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return ERR_PTR(-EINVAL);
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return onecell_data->domains[index];
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}
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static struct lock_class_key blk_ctrl_genpd_lock_class;
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static int imx8mp_blk_ctrl_probe(struct platform_device *pdev)
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{
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const struct imx8mp_blk_ctrl_data *bc_data;
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struct device *dev = &pdev->dev;
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struct imx8mp_blk_ctrl *bc;
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void __iomem *base;
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int num_domains, i, ret;
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struct regmap_config regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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};
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bc = devm_kzalloc(dev, sizeof(*bc), GFP_KERNEL);
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if (!bc)
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return -ENOMEM;
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bc->dev = dev;
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bc_data = of_device_get_match_data(dev);
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num_domains = bc_data->num_domains;
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base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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regmap_config.max_register = bc_data->max_reg;
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bc->regmap = devm_regmap_init_mmio(dev, base, ®map_config);
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if (IS_ERR(bc->regmap))
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return dev_err_probe(dev, PTR_ERR(bc->regmap),
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"failed to init regmap\n");
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bc->domains = devm_kcalloc(dev, num_domains,
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sizeof(struct imx8mp_blk_ctrl_domain),
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GFP_KERNEL);
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if (!bc->domains)
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return -ENOMEM;
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bc->onecell_data.num_domains = num_domains;
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bc->onecell_data.xlate = imx8m_blk_ctrl_xlate;
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bc->onecell_data.domains =
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devm_kcalloc(dev, num_domains,
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sizeof(struct generic_pm_domain *), GFP_KERNEL);
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if (!bc->onecell_data.domains)
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return -ENOMEM;
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bc->bus_power_dev = genpd_dev_pm_attach_by_name(dev, "bus");
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if (IS_ERR(bc->bus_power_dev))
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return dev_err_probe(dev, PTR_ERR(bc->bus_power_dev),
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"failed to attach bus power domain\n");
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bc->power_off = bc_data->power_off;
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bc->power_on = bc_data->power_on;
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for (i = 0; i < num_domains; i++) {
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const struct imx8mp_blk_ctrl_domain_data *data = &bc_data->domains[i];
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struct imx8mp_blk_ctrl_domain *domain = &bc->domains[i];
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int j;
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domain->data = data;
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for (j = 0; j < data->num_clks; j++)
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domain->clks[j].id = data->clk_names[j];
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ret = devm_clk_bulk_get(dev, data->num_clks, domain->clks);
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if (ret) {
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dev_err_probe(dev, ret, "failed to get clock\n");
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goto cleanup_pds;
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}
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domain->power_dev =
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dev_pm_domain_attach_by_name(dev, data->gpc_name);
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if (IS_ERR(domain->power_dev)) {
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dev_err_probe(dev, PTR_ERR(domain->power_dev),
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"failed to attach power domain %s\n",
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data->gpc_name);
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ret = PTR_ERR(domain->power_dev);
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goto cleanup_pds;
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}
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dev_set_name(domain->power_dev, "%s", data->name);
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domain->genpd.name = data->name;
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domain->genpd.power_on = imx8mp_blk_ctrl_power_on;
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domain->genpd.power_off = imx8mp_blk_ctrl_power_off;
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domain->bc = bc;
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domain->id = i;
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ret = pm_genpd_init(&domain->genpd, NULL, true);
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if (ret) {
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dev_err_probe(dev, ret, "failed to init power domain\n");
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dev_pm_domain_detach(domain->power_dev, true);
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goto cleanup_pds;
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}
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/*
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* We use runtime PM to trigger power on/off of the upstream GPC
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* domain, as a strict hierarchical parent/child power domain
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* setup doesn't allow us to meet the sequencing requirements.
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* This means we have nested locking of genpd locks, without the
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* nesting being visible at the genpd level, so we need a
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* separate lock class to make lockdep aware of the fact that
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* this are separate domain locks that can be nested without a
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* self-deadlock.
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*/
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lockdep_set_class(&domain->genpd.mlock,
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&blk_ctrl_genpd_lock_class);
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bc->onecell_data.domains[i] = &domain->genpd;
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}
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ret = of_genpd_add_provider_onecell(dev->of_node, &bc->onecell_data);
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if (ret) {
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dev_err_probe(dev, ret, "failed to add power domain provider\n");
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goto cleanup_pds;
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}
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bc->power_nb.notifier_call = bc_data->power_notifier_fn;
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ret = dev_pm_genpd_add_notifier(bc->bus_power_dev, &bc->power_nb);
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if (ret) {
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dev_err_probe(dev, ret, "failed to add power notifier\n");
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goto cleanup_provider;
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}
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dev_set_drvdata(dev, bc);
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return 0;
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cleanup_provider:
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of_genpd_del_provider(dev->of_node);
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cleanup_pds:
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for (i--; i >= 0; i--) {
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pm_genpd_remove(&bc->domains[i].genpd);
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dev_pm_domain_detach(bc->domains[i].power_dev, true);
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}
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dev_pm_domain_detach(bc->bus_power_dev, true);
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return ret;
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}
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static int imx8mp_blk_ctrl_remove(struct platform_device *pdev)
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{
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struct imx8mp_blk_ctrl *bc = dev_get_drvdata(&pdev->dev);
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int i;
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of_genpd_del_provider(pdev->dev.of_node);
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for (i = 0; bc->onecell_data.num_domains; i++) {
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struct imx8mp_blk_ctrl_domain *domain = &bc->domains[i];
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pm_genpd_remove(&domain->genpd);
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dev_pm_domain_detach(domain->power_dev, true);
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}
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dev_pm_genpd_remove_notifier(bc->bus_power_dev);
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dev_pm_domain_detach(bc->bus_power_dev, true);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int imx8mp_blk_ctrl_suspend(struct device *dev)
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{
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struct imx8mp_blk_ctrl *bc = dev_get_drvdata(dev);
|
||||
int ret, i;
|
||||
|
||||
/*
|
||||
* This may look strange, but is done so the generic PM_SLEEP code
|
||||
* can power down our domains and more importantly power them up again
|
||||
* after resume, without tripping over our usage of runtime PM to
|
||||
* control the upstream GPC domains. Things happen in the right order
|
||||
* in the system suspend/resume paths due to the device parent/child
|
||||
* hierarchy.
|
||||
*/
|
||||
ret = pm_runtime_get_sync(bc->bus_power_dev);
|
||||
if (ret < 0) {
|
||||
pm_runtime_put_noidle(bc->bus_power_dev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
for (i = 0; i < bc->onecell_data.num_domains; i++) {
|
||||
struct imx8mp_blk_ctrl_domain *domain = &bc->domains[i];
|
||||
|
||||
ret = pm_runtime_get_sync(domain->power_dev);
|
||||
if (ret < 0) {
|
||||
pm_runtime_put_noidle(domain->power_dev);
|
||||
goto out_fail;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_fail:
|
||||
for (i--; i >= 0; i--)
|
||||
pm_runtime_put(bc->domains[i].power_dev);
|
||||
|
||||
pm_runtime_put(bc->bus_power_dev);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int imx8mp_blk_ctrl_resume(struct device *dev)
|
||||
{
|
||||
struct imx8mp_blk_ctrl *bc = dev_get_drvdata(dev);
|
||||
int i;
|
||||
|
||||
for (i = 0; i < bc->onecell_data.num_domains; i++)
|
||||
pm_runtime_put(bc->domains[i].power_dev);
|
||||
|
||||
pm_runtime_put(bc->bus_power_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static const struct dev_pm_ops imx8mp_blk_ctrl_pm_ops = {
|
||||
SET_SYSTEM_SLEEP_PM_OPS(imx8mp_blk_ctrl_suspend,
|
||||
imx8mp_blk_ctrl_resume)
|
||||
};
|
||||
|
||||
static const struct of_device_id imx8mp_blk_ctrl_of_match[] = {
|
||||
{
|
||||
.compatible = "fsl,imx8mp-hsio-blk-ctrl",
|
||||
.data = &imx8mp_hsio_blk_ctl_dev_data,
|
||||
}, {
|
||||
/* Sentinel */
|
||||
}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, imx8m_blk_ctrl_of_match);
|
||||
|
||||
static struct platform_driver imx8mp_blk_ctrl_driver = {
|
||||
.probe = imx8mp_blk_ctrl_probe,
|
||||
.remove = imx8mp_blk_ctrl_remove,
|
||||
.driver = {
|
||||
.name = "imx8mp-blk-ctrl",
|
||||
.pm = &imx8mp_blk_ctrl_pm_ops,
|
||||
.of_match_table = imx8mp_blk_ctrl_of_match,
|
||||
},
|
||||
};
|
||||
module_platform_driver(imx8mp_blk_ctrl_driver);
|
||||
Loading…
Reference in New Issue
Block a user