summaryrefslogtreecommitdiffstats
path: root/drivers/clk/ingenic
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/ingenic')
-rw-r--r--drivers/clk/ingenic/Makefile1
-rw-r--r--drivers/clk/ingenic/jz4740-cgu.c222
2 files changed, 223 insertions, 0 deletions
diff --git a/drivers/clk/ingenic/Makefile b/drivers/clk/ingenic/Makefile
index 5ac2fd990b42..e6db7da03a1c 100644
--- a/drivers/clk/ingenic/Makefile
+++ b/drivers/clk/ingenic/Makefile
@@ -1 +1,2 @@
obj-y += cgu.o
+obj-$(CONFIG_MACH_JZ4740) += jz4740-cgu.o
diff --git a/drivers/clk/ingenic/jz4740-cgu.c b/drivers/clk/ingenic/jz4740-cgu.c
new file mode 100644
index 000000000000..d5bb7a39219e
--- /dev/null
+++ b/drivers/clk/ingenic/jz4740-cgu.c
@@ -0,0 +1,222 @@
+/*
+ * Ingenic JZ4740 SoC CGU driver
+ *
+ * Copyright (c) 2015 Imagination Technologies
+ * Author: Paul Burton <paul.burton@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <dt-bindings/clock/jz4740-cgu.h>
+#include "cgu.h"
+
+/* CGU register offsets */
+#define CGU_REG_CPCCR 0x00
+#define CGU_REG_CPPCR 0x10
+#define CGU_REG_SCR 0x24
+#define CGU_REG_I2SCDR 0x60
+#define CGU_REG_LPCDR 0x64
+#define CGU_REG_MSCCDR 0x68
+#define CGU_REG_UHCCDR 0x6c
+#define CGU_REG_SSICDR 0x74
+
+/* bits within a PLL control register */
+#define PLLCTL_M_SHIFT 23
+#define PLLCTL_M_MASK (0x1ff << PLLCTL_M_SHIFT)
+#define PLLCTL_N_SHIFT 18
+#define PLLCTL_N_MASK (0x1f << PLLCTL_N_SHIFT)
+#define PLLCTL_OD_SHIFT 16
+#define PLLCTL_OD_MASK (0x3 << PLLCTL_OD_SHIFT)
+#define PLLCTL_STABLE (1 << 10)
+#define PLLCTL_BYPASS (1 << 9)
+#define PLLCTL_ENABLE (1 << 8)
+
+static struct ingenic_cgu *cgu;
+
+static const s8 pll_od_encoding[4] = {
+ 0x0, 0x1, -1, 0x3,
+};
+
+static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
+
+ /* External clocks */
+
+ [JZ4740_CLK_EXT] = { "ext", CGU_CLK_EXT },
+ [JZ4740_CLK_RTC] = { "rtc", CGU_CLK_EXT },
+
+ [JZ4740_CLK_PLL] = {
+ "pll", CGU_CLK_PLL,
+ .parents = { JZ4740_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 */
+
+ [JZ4740_CLK_PLL_HALF] = {
+ "pll half", CGU_CLK_DIV,
+ .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
+ .div = { CGU_REG_CPCCR, 21, 1, -1, -1, -1 },
+ },
+
+ [JZ4740_CLK_CCLK] = {
+ "cclk", CGU_CLK_DIV,
+ .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
+ .div = { CGU_REG_CPCCR, 0, 4, 22, -1, -1 },
+ },
+
+ [JZ4740_CLK_HCLK] = {
+ "hclk", CGU_CLK_DIV,
+ .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
+ .div = { CGU_REG_CPCCR, 4, 4, 22, -1, -1 },
+ },
+
+ [JZ4740_CLK_PCLK] = {
+ "pclk", CGU_CLK_DIV,
+ .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
+ .div = { CGU_REG_CPCCR, 8, 4, 22, -1, -1 },
+ },
+
+ [JZ4740_CLK_MCLK] = {
+ "mclk", CGU_CLK_DIV,
+ .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
+ .div = { CGU_REG_CPCCR, 12, 4, 22, -1, -1 },
+ },
+
+ [JZ4740_CLK_LCD] = {
+ "lcd", CGU_CLK_DIV | CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
+ .div = { CGU_REG_CPCCR, 16, 5, 22, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 10 },
+ },
+
+ [JZ4740_CLK_LCD_PCLK] = {
+ "lcd_pclk", CGU_CLK_DIV,
+ .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
+ .div = { CGU_REG_LPCDR, 0, 11, -1, -1, -1 },
+ },
+
+ [JZ4740_CLK_I2S] = {
+ "i2s", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
+ .mux = { CGU_REG_CPCCR, 31, 1 },
+ .div = { CGU_REG_I2SCDR, 0, 8, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 6 },
+ },
+
+ [JZ4740_CLK_SPI] = {
+ "spi", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL, -1, -1 },
+ .mux = { CGU_REG_SSICDR, 31, 1 },
+ .div = { CGU_REG_SSICDR, 0, 4, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 4 },
+ },
+
+ [JZ4740_CLK_MMC] = {
+ "mmc", CGU_CLK_DIV | CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
+ .div = { CGU_REG_MSCCDR, 0, 5, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 7 },
+ },
+
+ [JZ4740_CLK_UHC] = {
+ "uhc", CGU_CLK_DIV | CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
+ .div = { CGU_REG_UHCCDR, 0, 4, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 14 },
+ },
+
+ [JZ4740_CLK_UDC] = {
+ "udc", CGU_CLK_MUX | CGU_CLK_DIV,
+ .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
+ .mux = { CGU_REG_CPCCR, 29, 1 },
+ .div = { CGU_REG_CPCCR, 23, 6, -1, -1, -1 },
+ .gate = { CGU_REG_SCR, 6 },
+ },
+
+ /* Gate-only clocks */
+
+ [JZ4740_CLK_UART0] = {
+ "uart0", CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 0 },
+ },
+
+ [JZ4740_CLK_UART1] = {
+ "uart1", CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 15 },
+ },
+
+ [JZ4740_CLK_DMA] = {
+ "dma", CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 12 },
+ },
+
+ [JZ4740_CLK_IPU] = {
+ "ipu", CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 13 },
+ },
+
+ [JZ4740_CLK_ADC] = {
+ "adc", CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 8 },
+ },
+
+ [JZ4740_CLK_I2C] = {
+ "i2c", CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 3 },
+ },
+
+ [JZ4740_CLK_AIC] = {
+ "aic", CGU_CLK_GATE,
+ .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
+ .gate = { CGU_REG_CLKGR, 5 },
+ },
+};
+
+static void __init jz4740_cgu_init(struct device_node *np)
+{
+ int retval;
+
+ cgu = ingenic_cgu_new(jz4740_cgu_clocks,
+ ARRAY_SIZE(jz4740_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(jz4740_cgu, "ingenic,jz4740-cgu", jz4740_cgu_init);