clk: imx: add clk driver for i.MX8QXP

Add clk driver for i.MX8QXP. This basic version supports clk
enable/disable/get_rate/set_rate operations for I2C, ENET,
SDHC0 and UART clocks.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Stefano Babic <sbabic@denx.de>

drivers/clk/Kconfig

@@ -100,6 +100,7 @@ config CLK_STM32MP1
 
 source "drivers/clk/at91/Kconfig"
 source "drivers/clk/exynos/Kconfig"
+source "drivers/clk/imx/Kconfig"
 source "drivers/clk/mvebu/Kconfig"
 source "drivers/clk/owl/Kconfig"
 source "drivers/clk/renesas/Kconfig"

drivers/clk/Makefile

@@ -7,6 +7,7 @@
 
 obj-$(CONFIG_$(SPL_TPL_)CLK) += clk-uclass.o clk_fixed_rate.o
 
+obj-y += imx/
 obj-y += tegra/
 obj-$(CONFIG_ARCH_ASPEED) += aspeed/
 obj-$(CONFIG_ARCH_MESON) += clk_meson.o

drivers/clk/imx/Kconfig

@@ -0,0 +1,6 @@
+config CLK_IMX8
+	bool "Clock support for i.MX8"
+	depends on ARCH_IMX8
+	select CLK
+	help
+	  This enables support clock driver for i.MX8 platforms.

drivers/clk/imx/Makefile

@@ -0,0 +1,5 @@
+# Copyright 2018 NXP
+#
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_CLK_IMX8) += clk-imx8.o

drivers/clk/imx/clk-imx8.c

@@ -0,0 +1,393 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2018 NXP
+ * Peng Fan <peng.fan@nxp.com>
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <asm/arch/sci/sci.h>
+#include <asm/arch/clock.h>
+#include <dt-bindings/clock/imx8qxp-clock.h>
+#include <dt-bindings/soc/imx_rsrc.h>
+#include <misc.h>
+
+struct imx8_clks {
+	ulong id;
+	const char *name;
+};
+
+static struct imx8_clks imx8_clk_names[] = {
+	{ IMX8QXP_A35_DIV, "A35_DIV" },
+	{ IMX8QXP_I2C0_CLK, "I2C0" },
+	{ IMX8QXP_I2C1_CLK, "I2C1" },
+	{ IMX8QXP_I2C2_CLK, "I2C2" },
+	{ IMX8QXP_I2C3_CLK, "I2C3" },
+	{ IMX8QXP_UART0_CLK, "UART0" },
+	{ IMX8QXP_UART1_CLK, "UART1" },
+	{ IMX8QXP_UART2_CLK, "UART2" },
+	{ IMX8QXP_UART3_CLK, "UART3" },
+	{ IMX8QXP_SDHC0_CLK, "SDHC0" },
+	{ IMX8QXP_SDHC1_CLK, "SDHC1" },
+	{ IMX8QXP_ENET0_AHB_CLK, "ENET0_AHB" },
+	{ IMX8QXP_ENET0_IPG_CLK, "ENET0_IPG" },
+	{ IMX8QXP_ENET0_REF_DIV, "ENET0_REF" },
+	{ IMX8QXP_ENET0_PTP_CLK, "ENET0_PTP" },
+	{ IMX8QXP_ENET1_AHB_CLK, "ENET1_AHB" },
+	{ IMX8QXP_ENET1_IPG_CLK, "ENET1_IPG" },
+	{ IMX8QXP_ENET1_REF_DIV, "ENET1_REF" },
+	{ IMX8QXP_ENET1_PTP_CLK, "ENET1_PTP" },
+};
+
+static ulong imx8_clk_get_rate(struct clk *clk)
+{
+	sc_pm_clk_t pm_clk;
+	ulong rate;
+	u16 resource;
+	int ret;
+
+	debug("%s(#%lu)\n", __func__, clk->id);
+
+	switch (clk->id) {
+	case IMX8QXP_A35_DIV:
+		resource = SC_R_A35;
+		pm_clk = SC_PM_CLK_CPU;
+		break;
+	case IMX8QXP_I2C0_CLK:
+		resource = SC_R_I2C_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_I2C1_CLK:
+		resource = SC_R_I2C_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_I2C2_CLK:
+		resource = SC_R_I2C_2;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_I2C3_CLK:
+		resource = SC_R_I2C_3;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_SDHC0_IPG_CLK:
+	case IMX8QXP_SDHC0_CLK:
+	case IMX8QXP_SDHC0_DIV:
+		resource = SC_R_SDHC_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_SDHC1_IPG_CLK:
+	case IMX8QXP_SDHC1_CLK:
+	case IMX8QXP_SDHC1_DIV:
+		resource = SC_R_SDHC_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART0_IPG_CLK:
+	case IMX8QXP_UART0_CLK:
+		resource = SC_R_UART_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART1_CLK:
+		resource = SC_R_UART_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART2_CLK:
+		resource = SC_R_UART_2;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART3_CLK:
+		resource = SC_R_UART_3;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_ENET0_IPG_CLK:
+	case IMX8QXP_ENET0_AHB_CLK:
+	case IMX8QXP_ENET0_REF_DIV:
+	case IMX8QXP_ENET0_PTP_CLK:
+		resource = SC_R_ENET_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_ENET1_IPG_CLK:
+	case IMX8QXP_ENET1_AHB_CLK:
+	case IMX8QXP_ENET1_REF_DIV:
+	case IMX8QXP_ENET1_PTP_CLK:
+		resource = SC_R_ENET_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	default:
+		if (clk->id < IMX8QXP_UART0_IPG_CLK ||
+		    clk->id >= IMX8QXP_CLK_END) {
+			printf("%s(Invalid clk ID #%lu)\n",
+			       __func__, clk->id);
+			return -EINVAL;
+		}
+		return -ENOTSUPP;
+	};
+
+	ret = sc_pm_get_clock_rate(-1, resource, pm_clk,
+				   (sc_pm_clock_rate_t *)&rate);
+	if (ret) {
+		printf("%s err %d\n", __func__, ret);
+		return ret;
+	}
+
+	return rate;
+}
+
+static ulong imx8_clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	sc_pm_clk_t pm_clk;
+	u32 new_rate = rate;
+	u16 resource;
+	int ret;
+
+	debug("%s(#%lu), rate: %lu\n", __func__, clk->id, rate);
+
+	switch (clk->id) {
+	case IMX8QXP_I2C0_CLK:
+		resource = SC_R_I2C_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_I2C1_CLK:
+		resource = SC_R_I2C_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_I2C2_CLK:
+		resource = SC_R_I2C_2;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_I2C3_CLK:
+		resource = SC_R_I2C_3;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART0_CLK:
+		resource = SC_R_UART_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART1_CLK:
+		resource = SC_R_UART_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART2_CLK:
+		resource = SC_R_UART_2;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART3_CLK:
+		resource = SC_R_UART_3;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_SDHC0_IPG_CLK:
+	case IMX8QXP_SDHC0_CLK:
+	case IMX8QXP_SDHC0_DIV:
+		resource = SC_R_SDHC_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_SDHC1_SEL:
+	case IMX8QXP_SDHC0_SEL:
+		return 0;
+	case IMX8QXP_SDHC1_IPG_CLK:
+	case IMX8QXP_SDHC1_CLK:
+	case IMX8QXP_SDHC1_DIV:
+		resource = SC_R_SDHC_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_ENET0_IPG_CLK:
+	case IMX8QXP_ENET0_AHB_CLK:
+	case IMX8QXP_ENET0_REF_DIV:
+	case IMX8QXP_ENET0_PTP_CLK:
+		resource = SC_R_ENET_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_ENET1_IPG_CLK:
+	case IMX8QXP_ENET1_AHB_CLK:
+	case IMX8QXP_ENET1_REF_DIV:
+	case IMX8QXP_ENET1_PTP_CLK:
+		resource = SC_R_ENET_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	default:
+		if (clk->id < IMX8QXP_UART0_IPG_CLK ||
+		    clk->id >= IMX8QXP_CLK_END) {
+			printf("%s(Invalid clk ID #%lu)\n",
+			       __func__, clk->id);
+			return -EINVAL;
+		}
+		return -ENOTSUPP;
+	};
+
+	ret = sc_pm_set_clock_rate(-1, resource, pm_clk, &new_rate);
+	if (ret) {
+		printf("%s err %d\n", __func__, ret);
+		return ret;
+	}
+
+	return new_rate;
+}
+
+static int __imx8_clk_enable(struct clk *clk, bool enable)
+{
+	sc_pm_clk_t pm_clk;
+	u16 resource;
+	int ret;
+
+	debug("%s(#%lu)\n", __func__, clk->id);
+
+	switch (clk->id) {
+	case IMX8QXP_I2C0_CLK:
+		resource = SC_R_I2C_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_I2C1_CLK:
+		resource = SC_R_I2C_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_I2C2_CLK:
+		resource = SC_R_I2C_2;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_I2C3_CLK:
+		resource = SC_R_I2C_3;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART0_CLK:
+		resource = SC_R_UART_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART1_CLK:
+		resource = SC_R_UART_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART2_CLK:
+		resource = SC_R_UART_2;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_UART3_CLK:
+		resource = SC_R_UART_3;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_SDHC0_IPG_CLK:
+	case IMX8QXP_SDHC0_CLK:
+	case IMX8QXP_SDHC0_DIV:
+		resource = SC_R_SDHC_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_SDHC1_IPG_CLK:
+	case IMX8QXP_SDHC1_CLK:
+	case IMX8QXP_SDHC1_DIV:
+		resource = SC_R_SDHC_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_ENET0_IPG_CLK:
+	case IMX8QXP_ENET0_AHB_CLK:
+	case IMX8QXP_ENET0_REF_DIV:
+	case IMX8QXP_ENET0_PTP_CLK:
+		resource = SC_R_ENET_0;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	case IMX8QXP_ENET1_IPG_CLK:
+	case IMX8QXP_ENET1_AHB_CLK:
+	case IMX8QXP_ENET1_REF_DIV:
+	case IMX8QXP_ENET1_PTP_CLK:
+		resource = SC_R_ENET_1;
+		pm_clk = SC_PM_CLK_PER;
+		break;
+	default:
+		if (clk->id < IMX8QXP_UART0_IPG_CLK ||
+		    clk->id >= IMX8QXP_CLK_END) {
+			printf("%s(Invalid clk ID #%lu)\n",
+			       __func__, clk->id);
+			return -EINVAL;
+		}
+		return -ENOTSUPP;
+	}
+
+	ret = sc_pm_clock_enable(-1, resource, pm_clk, enable, 0);
+	if (ret) {
+		printf("%s err %d\n", __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int imx8_clk_disable(struct clk *clk)
+{
+	return __imx8_clk_enable(clk, 0);
+}
+
+static int imx8_clk_enable(struct clk *clk)
+{
+	return __imx8_clk_enable(clk, 1);
+}
+
+#if CONFIG_IS_ENABLED(CMD_CLK)
+int soc_clk_dump(void)
+{
+	struct udevice *dev;
+	struct clk clk;
+	unsigned long rate;
+	int i, ret;
+
+	ret = uclass_get_device_by_driver(UCLASS_CLK,
+					  DM_GET_DRIVER(imx8_clk), &dev);
+	if (ret)
+		return ret;
+
+	printf("Clk\t\tHz\n");
+
+	for (i = 0; i < ARRAY_SIZE(imx8_clk_names); i++) {
+		clk.id = imx8_clk_names[i].id;
+		ret = clk_request(dev, &clk);
+		if (ret < 0) {
+			debug("%s clk_request() failed: %d\n", __func__, ret);
+			continue;
+		}
+
+		ret = clk_get_rate(&clk);
+		rate = ret;
+
+		clk_free(&clk);
+
+		if (ret == -ENOTSUPP) {
+			printf("clk ID %lu not supported yet\n",
+			       imx8_clk_names[i].id);
+			continue;
+		}
+		if (ret < 0) {
+			printf("%s %lu: get_rate err: %d\n",
+			       __func__, imx8_clk_names[i].id, ret);
+			continue;
+		}
+
+		printf("%s(%3lu):\t%lu\n",
+		       imx8_clk_names[i].name, imx8_clk_names[i].id, rate);
+	}
+
+	return 0;
+}
+#endif
+
+static struct clk_ops imx8_clk_ops = {
+	.set_rate = imx8_clk_set_rate,
+	.get_rate = imx8_clk_get_rate,
+	.enable = imx8_clk_enable,
+	.disable = imx8_clk_disable,
+};
+
+static int imx8_clk_probe(struct udevice *dev)
+{
+	return 0;
+}
+
+static const struct udevice_id imx8_clk_ids[] = {
+	{ .compatible = "fsl,imx8qxp-clk" },
+	{ },
+};
+
+U_BOOT_DRIVER(imx8_clk) = {
+	.name = "clk_imx8",
+	.id = UCLASS_CLK,
+	.of_match = imx8_clk_ids,
+	.ops = &imx8_clk_ops,
+	.probe = imx8_clk_probe,
+	.flags = DM_FLAG_PRE_RELOC,
+};