clk: Add Ingenic jz4725b CGU driver

Add support for the clocks provided by the CGU in the Ingenic JZ4725B
SoC.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/ingenic/Kconfig

@@ -14,6 +14,16 @@ config INGENIC_CGU_JZ4740
 
 	  If building for a JZ4740 SoC, you want to say Y here.
 
+config INGENIC_CGU_JZ4725B
+	bool "Ingenic JZ4725B CGU driver"
+	default MACH_JZ4725B
+	select INGENIC_CGU_COMMON
+	help
+	  Support the clocks provided by the CGU hardware on Ingenic JZ4725B
+	  and compatible SoCs.
+
+	  If building for a JZ4725B SoC, you want to say Y here.
+
 config INGENIC_CGU_JZ4770
 	bool "Ingenic JZ4770 CGU driver"
 	default MACH_JZ4770

drivers/clk/ingenic/Makefile

@@ -1,4 +1,5 @@
 obj-$(CONFIG_INGENIC_CGU_COMMON)	+= cgu.o
 obj-$(CONFIG_INGENIC_CGU_JZ4740)	+= jz4740-cgu.o
+obj-$(CONFIG_INGENIC_CGU_JZ4725B)	+= jz4725b-cgu.o
 obj-$(CONFIG_INGENIC_CGU_JZ4770)	+= jz4770-cgu.o
 obj-$(CONFIG_INGENIC_CGU_JZ4780)	+= jz4780-cgu.o

drivers/clk/ingenic/jz4725b-cgu.c

@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Ingenic JZ4725B SoC CGU driver
+ *
+ * Copyright (C) 2018 Paul Cercueil
+ * Author: Paul Cercueil <paul@crapouillou.net>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <dt-bindings/clock/jz4725b-cgu.h>
+#include "cgu.h"
+
+/* CGU register offsets */
+#define CGU_REG_CPCCR		0x00
+#define CGU_REG_LCR		0x04
+#define CGU_REG_CPPCR		0x10
+#define CGU_REG_CLKGR		0x20
+#define CGU_REG_OPCR		0x24
+#define CGU_REG_I2SCDR		0x60
+#define CGU_REG_LPCDR		0x64
+#define CGU_REG_MSCCDR		0x68
+#define CGU_REG_SSICDR		0x74
+#define CGU_REG_CIMCDR		0x78
+
+/* bits within the LCR register */
+#define LCR_SLEEP		BIT(0)
+
+static struct ingenic_cgu *cgu;
+
+static const s8 pll_od_encoding[4] = {
+	0x0, 0x1, -1, 0x3,
+};
+
+static const struct ingenic_cgu_clk_info jz4725b_cgu_clocks[] = {
+
+	/* External clocks */
+
+	[JZ4725B_CLK_EXT] = { "ext", CGU_CLK_EXT },
+	[JZ4725B_CLK_OSC32K] = { "osc32k", CGU_CLK_EXT },
+
+	[JZ4725B_CLK_PLL] = {
+		"pll", CGU_CLK_PLL,
+		.parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
+		.pll = {
+			.reg = CGU_REG_CPPCR,
+			.m_shift = 23,
+			.m_bits = 9,
+			.m_offset = 2,
+			.n_shift = 18,
+			.n_bits = 5,
+			.n_offset = 2,
+			.od_shift = 16,
+			.od_bits = 2,
+			.od_max = 4,
+			.od_encoding = pll_od_encoding,
+			.stable_bit = 10,
+			.bypass_bit = 9,
+			.enable_bit = 8,
+		},
+	},
+
+	/* Muxes & dividers */
+
+	[JZ4725B_CLK_PLL_HALF] = {
+		"pll half", CGU_CLK_DIV,
+		.parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
+		.div = { CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1 },
+	},
+
+	[JZ4725B_CLK_CCLK] = {
+		"cclk", CGU_CLK_DIV,
+		.parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
+		.div = { CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1 },
+	},
+
+	[JZ4725B_CLK_HCLK] = {
+		"hclk", CGU_CLK_DIV,
+		.parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
+		.div = { CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1 },
+	},
+
+	[JZ4725B_CLK_PCLK] = {
+		"pclk", CGU_CLK_DIV,
+		.parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
+		.div = { CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1 },
+	},
+
+	[JZ4725B_CLK_MCLK] = {
+		"mclk", CGU_CLK_DIV,
+		.parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
+		.div = { CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1 },
+	},
+
+	[JZ4725B_CLK_IPU] = {
+		"ipu", CGU_CLK_DIV | CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
+		.div = { CGU_REG_CPCCR, 16, 1, 4, 22, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 13 },
+	},
+
+	[JZ4725B_CLK_LCD] = {
+		"lcd", CGU_CLK_DIV | CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_PLL_HALF, -1, -1, -1 },
+		.div = { CGU_REG_LPCDR, 0, 1, 11, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 9 },
+	},
+
+	[JZ4725B_CLK_I2S] = {
+		"i2s", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_EXT, JZ4725B_CLK_PLL_HALF, -1, -1 },
+		.mux = { CGU_REG_CPCCR, 31, 1 },
+		.div = { CGU_REG_I2SCDR, 0, 1, 9, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 6 },
+	},
+
+	[JZ4725B_CLK_SPI] = {
+		"spi", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_EXT, JZ4725B_CLK_PLL, -1, -1 },
+		.mux = { CGU_REG_SSICDR, 31, 1 },
+		.div = { CGU_REG_SSICDR, 0, 1, 4, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 4 },
+	},
+
+	[JZ4725B_CLK_MMC_MUX] = {
+		"mmc_mux", CGU_CLK_DIV,
+		.parents = { JZ4725B_CLK_PLL_HALF, -1, -1, -1 },
+		.div = { CGU_REG_MSCCDR, 0, 1, 5, -1, -1, -1 },
+	},
+
+	[JZ4725B_CLK_UDC] = {
+		"udc", CGU_CLK_MUX | CGU_CLK_DIV,
+		.parents = { JZ4725B_CLK_EXT, JZ4725B_CLK_PLL_HALF, -1, -1 },
+		.mux = { CGU_REG_CPCCR, 29, 1 },
+		.div = { CGU_REG_CPCCR, 23, 1, 6, -1, -1, -1 },
+	},
+
+	/* Gate-only clocks */
+
+	[JZ4725B_CLK_UART] = {
+		"uart", CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 0 },
+	},
+
+	[JZ4725B_CLK_DMA] = {
+		"dma", CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_PCLK, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 12 },
+	},
+
+	[JZ4725B_CLK_ADC] = {
+		"adc", CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 7 },
+	},
+
+	[JZ4725B_CLK_I2C] = {
+		"i2c", CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 3 },
+	},
+
+	[JZ4725B_CLK_AIC] = {
+		"aic", CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 5 },
+	},
+
+	[JZ4725B_CLK_MMC0] = {
+		"mmc0", CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_MMC_MUX, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 6 },
+	},
+
+	[JZ4725B_CLK_MMC1] = {
+		"mmc1", CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_MMC_MUX, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 16 },
+	},
+
+	[JZ4725B_CLK_BCH] = {
+		"bch", CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_MCLK/* not sure */, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 11 },
+	},
+
+	[JZ4725B_CLK_TCU] = {
+		"tcu", CGU_CLK_GATE,
+		.parents = { JZ4725B_CLK_EXT/* not sure */, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 1 },
+	},
+
+	[JZ4725B_CLK_EXT512] = {
+		"ext/512", CGU_CLK_FIXDIV,
+		.parents = { JZ4725B_CLK_EXT },
+
+		/* Doc calls it EXT512, but it seems to be /256... */
+		.fixdiv = { 256 },
+	},
+
+	[JZ4725B_CLK_RTC] = {
+		"rtc", CGU_CLK_MUX,
+		.parents = { JZ4725B_CLK_EXT512, JZ4725B_CLK_OSC32K, -1, -1 },
+		.mux = { CGU_REG_OPCR, 2, 1},
+	},
+};
+
+static void __init jz4725b_cgu_init(struct device_node *np)
+{
+	int retval;
+
+	cgu = ingenic_cgu_new(jz4725b_cgu_clocks,
+			      ARRAY_SIZE(jz4725b_cgu_clocks), np);
+	if (!cgu) {
+		pr_err("%s: failed to initialise CGU\n", __func__);
+		return;
+	}
+
+	retval = ingenic_cgu_register_clocks(cgu);
+	if (retval)
+		pr_err("%s: failed to register CGU Clocks\n", __func__);
+}
+CLK_OF_DECLARE(jz4725b_cgu, "ingenic,jz4725b-cgu", jz4725b_cgu_init);