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>

3 files changed, 236 insertions, 0 deletions

diff --git a/drivers/clk/ingenic/Kconfig b/drivers/clk/ingenic/Kconfig
index 2445437f8286..34dc0da79c39 100644
--- a/drivers/clk/ingenic/Kconfig
+++ b/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
diff --git a/drivers/clk/ingenic/Makefile b/drivers/clk/ingenic/Makefile
index 8b8dc79c7ce6..00a79b2fba10 100644
--- a/drivers/clk/ingenic/Makefile
+++ b/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
diff --git a/drivers/clk/ingenic/jz4725b-cgu.c b/drivers/clk/ingenic/jz4725b-cgu.c
new file mode 100644
index 000000000000..584ff4ff81c7
--- /dev/null
+++ b/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);