genpd: imx: relocate scu-pd under genpd

Move scu-pd driver under genpd directory where the driver
should be.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

2 files changed, 429 insertions, 0 deletions

diff --git a/drivers/genpd/imx/Makefile b/drivers/genpd/imx/Makefile
index 5f012717a666..52d2629014a7 100644
--- a/drivers/genpd/imx/Makefile
+++ b/drivers/genpd/imx/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
 obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
+obj-$(CONFIG_IMX_SCU_PD) += scu-pd.o
 obj-$(CONFIG_IMX8M_BLK_CTRL) += imx8m-blk-ctrl.o
 obj-$(CONFIG_IMX8M_BLK_CTRL) += imx8mp-blk-ctrl.o
 obj-$(CONFIG_SOC_IMX9) += imx93-pd.o
diff --git a/drivers/genpd/imx/scu-pd.c b/drivers/genpd/imx/scu-pd.c
new file mode 100644
index 000000000000..84b673427073
--- /dev/null
+++ b/drivers/genpd/imx/scu-pd.c
@@ -0,0 +1,428 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017-2018 NXP
+ *	Dong Aisheng <aisheng.dong@nxp.com>
+ *
+ * Implementation of the SCU based Power Domains
+ *
+ * NOTE: a better implementation suggested by Ulf Hansson is using a
+ * single global power domain and implement the ->attach|detach_dev()
+ * callback for the genpd and use the regular of_genpd_add_provider_simple().
+ * From within the ->attach_dev(), we could get the OF node for
+ * the device that is being attached and then parse the power-domain
+ * cell containing the "resource id" and store that in the per device
+ * struct generic_pm_domain_data (we have void pointer there for
+ * storing these kind of things).
+ *
+ * Additionally, we need to implement the ->stop() and ->start()
+ * callbacks of genpd, which is where you "power on/off" devices,
+ * rather than using the above ->power_on|off() callbacks.
+ *
+ * However, there're two known issues:
+ * 1. The ->attach_dev() of power domain infrastructure still does
+ *    not support multi domains case as the struct device *dev passed
+ *    in is a virtual PD device, it does not help for parsing the real
+ *    device resource id from device tree, so it's unware of which
+ *    real sub power domain of device should be attached.
+ *
+ *    The framework needs some proper extension to support multi power
+ *    domain cases.
+ *
+ *    Update: Genpd assigns the ->of_node for the virtual device before it
+ *    invokes ->attach_dev() callback, hence parsing for device resources via
+ *    DT should work fine.
+ *
+ * 2. It also breaks most of current drivers as the driver probe sequence
+ *    behavior changed if removing ->power_on|off() callback and use
+ *    ->start() and ->stop() instead. genpd_dev_pm_attach will only power
+ *    up the domain and attach device, but will not call .start() which
+ *    relies on device runtime pm. That means the device power is still
+ *    not up before running driver probe function. For SCU enabled
+ *    platforms, all device drivers accessing registers/clock without power
+ *    domain enabled will trigger a HW access error. That means we need fix
+ *    most drivers probe sequence with proper runtime pm.
+ *
+ *    Update: Runtime PM support isn't necessary. Instead, this can easily be
+ *    fixed in drivers by adding a call to dev_pm_domain_start() during probe.
+ *
+ * In summary, the second part needs to be addressed via minor updates to the
+ * relevant drivers, before the "single global power domain" model can be used.
+ *
+ */
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/firmware/imx/svc/rm.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_domain.h>
+#include <linux/slab.h>
+
+/* SCU Power Mode Protocol definition */
+struct imx_sc_msg_req_set_resource_power_mode {
+	struct imx_sc_rpc_msg hdr;
+	u16 resource;
+	u8 mode;
+} __packed __aligned(4);
+
+#define IMX_SCU_PD_NAME_SIZE 20
+struct imx_sc_pm_domain {
+	struct generic_pm_domain pd;
+	char name[IMX_SCU_PD_NAME_SIZE];
+	u32 rsrc;
+};
+
+struct imx_sc_pd_range {
+	char *name;
+	u32 rsrc;
+	u8 num;
+
+	/* add domain index */
+	bool postfix;
+	u8 start_from;
+};
+
+struct imx_sc_pd_soc {
+	const struct imx_sc_pd_range *pd_ranges;
+	u8 num_ranges;
+};
+
+static int imx_con_rsrc;
+
+static const struct imx_sc_pd_range imx8qxp_scu_pd_ranges[] = {
+	/* LSIO SS */
+	{ "pwm", IMX_SC_R_PWM_0, 8, true, 0 },
+	{ "gpio", IMX_SC_R_GPIO_0, 8, true, 0 },
+	{ "gpt", IMX_SC_R_GPT_0, 5, true, 0 },
+	{ "kpp", IMX_SC_R_KPP, 1, false, 0 },
+	{ "fspi", IMX_SC_R_FSPI_0, 2, true, 0 },
+	{ "mu_a", IMX_SC_R_MU_0A, 14, true, 0 },
+	{ "mu_b", IMX_SC_R_MU_5B, 9, true, 5 },
+
+	/* CONN SS */
+	{ "usb", IMX_SC_R_USB_0, 2, true, 0 },
+	{ "usb0phy", IMX_SC_R_USB_0_PHY, 1, false, 0 },
+	{ "usb1phy", IMX_SC_R_USB_1_PHY, 1, false, 0},
+	{ "usb2", IMX_SC_R_USB_2, 1, false, 0 },
+	{ "usb2phy", IMX_SC_R_USB_2_PHY, 1, false, 0 },
+	{ "sdhc", IMX_SC_R_SDHC_0, 3, true, 0 },
+	{ "enet", IMX_SC_R_ENET_0, 2, true, 0 },
+	{ "nand", IMX_SC_R_NAND, 1, false, 0 },
+	{ "mlb", IMX_SC_R_MLB_0, 1, true, 0 },
+
+	/* AUDIO SS */
+	{ "audio-pll0", IMX_SC_R_AUDIO_PLL_0, 1, false, 0 },
+	{ "audio-pll1", IMX_SC_R_AUDIO_PLL_1, 1, false, 0 },
+	{ "audio-clk-0", IMX_SC_R_AUDIO_CLK_0, 1, false, 0 },
+	{ "audio-clk-1", IMX_SC_R_AUDIO_CLK_1, 1, false, 0 },
+	{ "dma0-ch", IMX_SC_R_DMA_0_CH0, 16, true, 0 },
+	{ "dma1-ch", IMX_SC_R_DMA_1_CH0, 16, true, 0 },
+	{ "dma2-ch", IMX_SC_R_DMA_2_CH0, 5, true, 0 },
+	{ "asrc0", IMX_SC_R_ASRC_0, 1, false, 0 },
+	{ "asrc1", IMX_SC_R_ASRC_1, 1, false, 0 },
+	{ "esai0", IMX_SC_R_ESAI_0, 1, false, 0 },
+	{ "spdif0", IMX_SC_R_SPDIF_0, 1, false, 0 },
+	{ "spdif1", IMX_SC_R_SPDIF_1, 1, false, 0 },
+	{ "sai", IMX_SC_R_SAI_0, 3, true, 0 },
+	{ "sai3", IMX_SC_R_SAI_3, 1, false, 0 },
+	{ "sai4", IMX_SC_R_SAI_4, 1, false, 0 },
+	{ "sai5", IMX_SC_R_SAI_5, 1, false, 0 },
+	{ "sai6", IMX_SC_R_SAI_6, 1, false, 0 },
+	{ "sai7", IMX_SC_R_SAI_7, 1, false, 0 },
+	{ "amix", IMX_SC_R_AMIX, 1, false, 0 },
+	{ "mqs0", IMX_SC_R_MQS_0, 1, false, 0 },
+	{ "dsp", IMX_SC_R_DSP, 1, false, 0 },
+	{ "dsp-ram", IMX_SC_R_DSP_RAM, 1, false, 0 },
+
+	/* DMA SS */
+	{ "can", IMX_SC_R_CAN_0, 3, true, 0 },
+	{ "ftm", IMX_SC_R_FTM_0, 2, true, 0 },
+	{ "lpi2c", IMX_SC_R_I2C_0, 4, true, 0 },
+	{ "adc", IMX_SC_R_ADC_0, 2, true, 0 },
+	{ "lcd", IMX_SC_R_LCD_0, 1, true, 0 },
+	{ "lcd0-pwm", IMX_SC_R_LCD_0_PWM_0, 1, true, 0 },
+	{ "lpuart", IMX_SC_R_UART_0, 4, true, 0 },
+	{ "lpspi", IMX_SC_R_SPI_0, 4, true, 0 },
+	{ "irqstr_dsp", IMX_SC_R_IRQSTR_DSP, 1, false, 0 },
+
+	/* VPU SS */
+	{ "vpu", IMX_SC_R_VPU, 1, false, 0 },
+	{ "vpu-pid", IMX_SC_R_VPU_PID0, 8, true, 0 },
+	{ "vpu-dec0", IMX_SC_R_VPU_DEC_0, 1, false, 0 },
+	{ "vpu-enc0", IMX_SC_R_VPU_ENC_0, 1, false, 0 },
+	{ "vpu-enc1", IMX_SC_R_VPU_ENC_1, 1, false, 0 },
+	{ "vpu-mu0", IMX_SC_R_VPU_MU_0, 1, false, 0 },
+	{ "vpu-mu1", IMX_SC_R_VPU_MU_1, 1, false, 0 },
+	{ "vpu-mu2", IMX_SC_R_VPU_MU_2, 1, false, 0 },
+
+	/* GPU SS */
+	{ "gpu0-pid", IMX_SC_R_GPU_0_PID0, 4, true, 0 },
+
+	/* HSIO SS */
+	{ "pcie-b", IMX_SC_R_PCIE_B, 1, false, 0 },
+	{ "serdes-1", IMX_SC_R_SERDES_1, 1, false, 0 },
+	{ "hsio-gpio", IMX_SC_R_HSIO_GPIO, 1, false, 0 },
+
+	/* MIPI SS */
+	{ "mipi0", IMX_SC_R_MIPI_0, 1, false, 0 },
+	{ "mipi0-pwm0", IMX_SC_R_MIPI_0_PWM_0, 1, false, 0 },
+	{ "mipi0-i2c", IMX_SC_R_MIPI_0_I2C_0, 2, true, 0 },
+
+	{ "mipi1", IMX_SC_R_MIPI_1, 1, false, 0 },
+	{ "mipi1-pwm0", IMX_SC_R_MIPI_1_PWM_0, 1, false, 0 },
+	{ "mipi1-i2c", IMX_SC_R_MIPI_1_I2C_0, 2, true, 0 },
+
+	/* LVDS SS */
+	{ "lvds0", IMX_SC_R_LVDS_0, 1, false, 0 },
+	{ "lvds0-pwm", IMX_SC_R_LVDS_0_PWM_0, 1, false, 0 },
+	{ "lvds0-lpi2c", IMX_SC_R_LVDS_0_I2C_0, 2, true, 0 },
+	{ "lvds1", IMX_SC_R_LVDS_1, 1, false, 0 },
+	{ "lvds1-pwm", IMX_SC_R_LVDS_1_PWM_0, 1, false, 0 },
+	{ "lvds1-lpi2c", IMX_SC_R_LVDS_1_I2C_0, 2, true, 0 },
+
+	/* DC SS */
+	{ "dc0", IMX_SC_R_DC_0, 1, false, 0 },
+	{ "dc0-pll", IMX_SC_R_DC_0_PLL_0, 2, true, 0 },
+	{ "dc0-video", IMX_SC_R_DC_0_VIDEO0, 2, true, 0 },
+
+	/* CM40 SS */
+	{ "cm40-i2c", IMX_SC_R_M4_0_I2C, 1, false, 0 },
+	{ "cm40-intmux", IMX_SC_R_M4_0_INTMUX, 1, false, 0 },
+	{ "cm40-pid", IMX_SC_R_M4_0_PID0, 5, true, 0},
+	{ "cm40-mu-a1", IMX_SC_R_M4_0_MU_1A, 1, false, 0},
+	{ "cm40-lpuart", IMX_SC_R_M4_0_UART, 1, false, 0},
+
+	/* CM41 SS */
+	{ "cm41-i2c", IMX_SC_R_M4_1_I2C, 1, false, 0 },
+	{ "cm41-intmux", IMX_SC_R_M4_1_INTMUX, 1, false, 0 },
+	{ "cm41-pid", IMX_SC_R_M4_1_PID0, 5, true, 0},
+	{ "cm41-mu-a1", IMX_SC_R_M4_1_MU_1A, 1, false, 0},
+	{ "cm41-lpuart", IMX_SC_R_M4_1_UART, 1, false, 0},
+
+	/* IMAGE SS */
+	{ "img-jpegdec-mp", IMX_SC_R_MJPEG_DEC_MP, 1, false, 0 },
+	{ "img-jpegdec-s0", IMX_SC_R_MJPEG_DEC_S0, 4, true, 0 },
+	{ "img-jpegenc-mp", IMX_SC_R_MJPEG_ENC_MP, 1, false, 0 },
+	{ "img-jpegenc-s0", IMX_SC_R_MJPEG_ENC_S0, 4, true, 0 },
+};
+
+static const struct imx_sc_pd_soc imx8qxp_scu_pd = {
+	.pd_ranges = imx8qxp_scu_pd_ranges,
+	.num_ranges = ARRAY_SIZE(imx8qxp_scu_pd_ranges),
+};
+
+static struct imx_sc_ipc *pm_ipc_handle;
+
+static inline struct imx_sc_pm_domain *
+to_imx_sc_pd(struct generic_pm_domain *genpd)
+{
+	return container_of(genpd, struct imx_sc_pm_domain, pd);
+}
+
+static void imx_sc_pd_get_console_rsrc(void)
+{
+	struct of_phandle_args specs;
+	int ret;
+
+	if (!of_stdout)
+		return;
+
+	ret = of_parse_phandle_with_args(of_stdout, "power-domains",
+					 "#power-domain-cells",
+					 0, &specs);
+	if (ret)
+		return;
+
+	imx_con_rsrc = specs.args[0];
+}
+
+static int imx_sc_pd_power(struct generic_pm_domain *domain, bool power_on)
+{
+	struct imx_sc_msg_req_set_resource_power_mode msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	struct imx_sc_pm_domain *pd;
+	int ret;
+
+	pd = to_imx_sc_pd(domain);
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_PM;
+	hdr->func = IMX_SC_PM_FUNC_SET_RESOURCE_POWER_MODE;
+	hdr->size = 2;
+
+	msg.resource = pd->rsrc;
+	msg.mode = power_on ? IMX_SC_PM_PW_MODE_ON : IMX_SC_PM_PW_MODE_LP;
+
+	ret = imx_scu_call_rpc(pm_ipc_handle, &msg, true);
+	if (ret)
+		dev_err(&domain->dev, "failed to power %s resource %d ret %d\n",
+			power_on ? "up" : "off", pd->rsrc, ret);
+
+	return ret;
+}
+
+static int imx_sc_pd_power_on(struct generic_pm_domain *domain)
+{
+	return imx_sc_pd_power(domain, true);
+}
+
+static int imx_sc_pd_power_off(struct generic_pm_domain *domain)
+{
+	return imx_sc_pd_power(domain, false);
+}
+
+static struct generic_pm_domain *imx_scu_pd_xlate(struct of_phandle_args *spec,
+						  void *data)
+{
+	struct generic_pm_domain *domain = ERR_PTR(-ENOENT);
+	struct genpd_onecell_data *pd_data = data;
+	unsigned int i;
+
+	for (i = 0; i < pd_data->num_domains; i++) {
+		struct imx_sc_pm_domain *sc_pd;
+
+		sc_pd = to_imx_sc_pd(pd_data->domains[i]);
+		if (sc_pd->rsrc == spec->args[0]) {
+			domain = &sc_pd->pd;
+			break;
+		}
+	}
+
+	return domain;
+}
+
+static struct imx_sc_pm_domain *
+imx_scu_add_pm_domain(struct device *dev, int idx,
+		      const struct imx_sc_pd_range *pd_ranges)
+{
+	struct imx_sc_pm_domain *sc_pd;
+	bool is_off = true;
+	int ret;
+
+	if (!imx_sc_rm_is_resource_owned(pm_ipc_handle, pd_ranges->rsrc + idx))
+		return NULL;
+
+	sc_pd = devm_kzalloc(dev, sizeof(*sc_pd), GFP_KERNEL);
+	if (!sc_pd)
+		return ERR_PTR(-ENOMEM);
+
+	sc_pd->rsrc = pd_ranges->rsrc + idx;
+	sc_pd->pd.power_off = imx_sc_pd_power_off;
+	sc_pd->pd.power_on = imx_sc_pd_power_on;
+
+	if (pd_ranges->postfix)
+		snprintf(sc_pd->name, sizeof(sc_pd->name),
+			 "%s%i", pd_ranges->name, pd_ranges->start_from + idx);
+	else
+		snprintf(sc_pd->name, sizeof(sc_pd->name),
+			 "%s", pd_ranges->name);
+
+	sc_pd->pd.name = sc_pd->name;
+	if (imx_con_rsrc == sc_pd->rsrc) {
+		sc_pd->pd.flags = GENPD_FLAG_RPM_ALWAYS_ON;
+		is_off = false;
+	}
+
+	if (sc_pd->rsrc >= IMX_SC_R_LAST) {
+		dev_warn(dev, "invalid pd %s rsrc id %d found",
+			 sc_pd->name, sc_pd->rsrc);
+
+		devm_kfree(dev, sc_pd);
+		return NULL;
+	}
+
+	ret = pm_genpd_init(&sc_pd->pd, NULL, is_off);
+	if (ret) {
+		dev_warn(dev, "failed to init pd %s rsrc id %d",
+			 sc_pd->name, sc_pd->rsrc);
+		devm_kfree(dev, sc_pd);
+		return NULL;
+	}
+
+	return sc_pd;
+}
+
+static int imx_scu_init_pm_domains(struct device *dev,
+				    const struct imx_sc_pd_soc *pd_soc)
+{
+	const struct imx_sc_pd_range *pd_ranges = pd_soc->pd_ranges;
+	struct generic_pm_domain **domains;
+	struct genpd_onecell_data *pd_data;
+	struct imx_sc_pm_domain *sc_pd;
+	u32 count = 0;
+	int i, j;
+
+	for (i = 0; i < pd_soc->num_ranges; i++)
+		count += pd_ranges[i].num;
+
+	domains = devm_kcalloc(dev, count, sizeof(*domains), GFP_KERNEL);
+	if (!domains)
+		return -ENOMEM;
+
+	pd_data = devm_kzalloc(dev, sizeof(*pd_data), GFP_KERNEL);
+	if (!pd_data)
+		return -ENOMEM;
+
+	count = 0;
+	for (i = 0; i < pd_soc->num_ranges; i++) {
+		for (j = 0; j < pd_ranges[i].num; j++) {
+			sc_pd = imx_scu_add_pm_domain(dev, j, &pd_ranges[i]);
+			if (IS_ERR_OR_NULL(sc_pd))
+				continue;
+
+			domains[count++] = &sc_pd->pd;
+			dev_dbg(dev, "added power domain %s\n", sc_pd->pd.name);
+		}
+	}
+
+	pd_data->domains = domains;
+	pd_data->num_domains = count;
+	pd_data->xlate = imx_scu_pd_xlate;
+
+	of_genpd_add_provider_onecell(dev->of_node, pd_data);
+
+	return 0;
+}
+
+static int imx_sc_pd_probe(struct platform_device *pdev)
+{
+	const struct imx_sc_pd_soc *pd_soc;
+	int ret;
+
+	ret = imx_scu_get_handle(&pm_ipc_handle);
+	if (ret)
+		return ret;
+
+	pd_soc = of_device_get_match_data(&pdev->dev);
+	if (!pd_soc)
+		return -ENODEV;
+
+	imx_sc_pd_get_console_rsrc();
+
+	return imx_scu_init_pm_domains(&pdev->dev, pd_soc);
+}
+
+static const struct of_device_id imx_sc_pd_match[] = {
+	{ .compatible = "fsl,imx8qxp-scu-pd", &imx8qxp_scu_pd},
+	{ .compatible = "fsl,scu-pd", &imx8qxp_scu_pd},
+	{ /* sentinel */ }
+};
+
+static struct platform_driver imx_sc_pd_driver = {
+	.driver = {
+		.name = "imx-scu-pd",
+		.of_match_table = imx_sc_pd_match,
+	},
+	.probe = imx_sc_pd_probe,
+};
+builtin_platform_driver(imx_sc_pd_driver);
+
+MODULE_AUTHOR("Dong Aisheng <aisheng.dong@nxp.com>");
+MODULE_DESCRIPTION("IMX SCU Power Domain driver");
+MODULE_LICENSE("GPL v2");