[ARM] S3C64XX: Add initial clock framework

Add the initial clocks definitions for the s3c6400
and s3c6410. Move the epll and ext clock from the
s3c2443 support into the common code.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

7 files changed, 279 insertions, 20 deletions

diff --git a/arch/arm/mach-s3c2412/clock.c b/arch/arm/mach-s3c2412/clock.c
index 96d9eb15424..3ce15e082e7 100644
--- a/arch/arm/mach-s3c2412/clock.c
+++ b/arch/arm/mach-s3c2412/clock.c
@@ -93,12 +93,6 @@ static int s3c2412_upll_enable(struct clk *clk, int enable)
 
 /* clock selections */
 
-/* CPU EXTCLK input */
-static struct clk clk_ext = {
-	.name		= "extclk",
-	.id		= -1,
-};
-
 static struct clk clk_erefclk = {
 	.name		= "erefclk",
 	.id		= -1,
diff --git a/arch/arm/mach-s3c2443/clock.c b/arch/arm/mach-s3c2443/clock.c
index 1df8429242b..363f3960878 100644
--- a/arch/arm/mach-s3c2443/clock.c
+++ b/arch/arm/mach-s3c2443/clock.c
@@ -147,12 +147,6 @@ static unsigned long s3c2443_roundrate_clksrc256(struct clk *clk,
 
 /* clock selections */
 
-/* CPU EXTCLK input */
-static struct clk clk_ext = {
-	.name		= "ext",
-	.id		= -1,
-};
-
 static struct clk clk_mpllref = {
 	.name		= "mpllref",
 	.parent		= &clk_xtal,
@@ -167,14 +161,6 @@ static struct clk clk_mpll = {
 };
 #endif
 
-static struct clk clk_epllref;
-
-static struct clk clk_epll = {
-	.name		= "epll",
-	.parent		= &clk_epllref,
-	.id		= -1,
-};
-
 static struct clk clk_i2s_ext = {
 	.name		= "i2s-ext",
 	.id		= -1,
@@ -1072,6 +1058,7 @@ void __init s3c2443_init_clocks(int xtal)
 	}
 
 	clk_epll.rate = s3c2443_get_epll(epllcon, xtal);
+	clk_epll.parent = &clk_epllref;
 	clk_usb_bus.parent = &clk_usb_bus_host;
 
 	/* ensure usb bus clock is within correct rate of 48MHz */
diff --git a/arch/arm/mach-s3c6410/cpu.c b/arch/arm/mach-s3c6410/cpu.c
index c3e317c1650..94a6204ee55 100644
--- a/arch/arm/mach-s3c6410/cpu.c
+++ b/arch/arm/mach-s3c6410/cpu.c
@@ -56,6 +56,7 @@ void __init s3c6410_init_clocks(int xtal)
 {
 	printk(KERN_INFO "%s: initialising clocks\n", __func__);
 	s3c24xx_register_baseclocks(xtal);
+	s3c64xx_register_clocks();
 }
 
 void __init s3c6410_init_irq(void)
diff --git a/arch/arm/plat-s3c/clock.c b/arch/arm/plat-s3c/clock.c
index 35249b58f38..742318afb54 100644
--- a/arch/arm/plat-s3c/clock.c
+++ b/arch/arm/plat-s3c/clock.c
@@ -239,6 +239,16 @@ struct clk clk_xtal = {
 	.ctrlbit	= 0,
 };
 
+struct clk clk_ext = {
+	.name		= "ext",
+	.id		= -1,
+};
+
+struct clk clk_epll = {
+	.name		= "epll",
+	.id		= -1,
+};
+
 struct clk clk_mpll = {
 	.name		= "mpll",
 	.id		= -1,
diff --git a/arch/arm/plat-s3c/include/plat/clock.h b/arch/arm/plat-s3c/include/plat/clock.h
index d871609738f..6a2c5af1000 100644
--- a/arch/arm/plat-s3c/include/plat/clock.h
+++ b/arch/arm/plat-s3c/include/plat/clock.h
@@ -45,7 +45,13 @@ extern struct clk clk_h;
 extern struct clk clk_p;
 extern struct clk clk_mpll;
 extern struct clk clk_upll;
+extern struct clk clk_epll;
 extern struct clk clk_xtal;
+extern struct clk clk_ext;
+
+/* S3C64XX specific clocks */
+extern struct clk clk_27m;
+extern struct clk clk_48m;
 
 /* exports for arch/arm/mach-s3c2410
  *
@@ -61,6 +67,8 @@ extern int s3c24xx_register_clocks(struct clk **clk, int nr_clks);
 
 extern int s3c24xx_register_baseclocks(unsigned long xtal);
 
+extern void s3c64xx_register_clocks(void);
+
 extern void s3c24xx_setup_clocks(unsigned long fclk,
 				 unsigned long hclk,
 				 unsigned long pclk);
diff --git a/arch/arm/plat-s3c64xx/Makefile b/arch/arm/plat-s3c64xx/Makefile
index 26b5714ee73..15f717fd148 100644
--- a/arch/arm/plat-s3c64xx/Makefile
+++ b/arch/arm/plat-s3c64xx/Makefile
@@ -15,6 +15,7 @@ obj-				:=
 obj-y				+= dev-uart.o
 obj-y				+= cpu.o
 obj-y				+= irq.o
+obj-y				+= clock.o
 
 # CPU support
 
diff --git a/arch/arm/plat-s3c64xx/clock.c b/arch/arm/plat-s3c64xx/clock.c
new file mode 100644
index 00000000000..e7c2994e2d3
--- /dev/null
+++ b/arch/arm/plat-s3c64xx/clock.c
@@ -0,0 +1,258 @@
+/* linux/arch/arm/plat-s3c64xx/clock.c
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *	http://armlinux.simtec.co.uk/
+ *
+ * S3C64XX Base clock support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/map.h>
+
+#include <plat/regs-clock.h>
+#include <plat/cpu.h>
+#include <plat/devs.h>
+#include <plat/clock.h>
+
+struct clk clk_27m = {
+	.name		= "clk_27m",
+	.id		= -1,
+	.rate		= 27000000,
+};
+
+struct clk clk_48m = {
+	.name		= "clk_48m",
+	.id		= -1,
+	.rate		= 48000000,
+};
+
+static int inline s3c64xx_gate(void __iomem *reg,
+				struct clk *clk,
+				int enable)
+{
+	unsigned int ctrlbit = clk->ctrlbit;
+	u32 con;
+
+	con = __raw_readl(reg);
+
+	if (enable)
+		con |= ctrlbit;
+	else
+		con &= ~ctrlbit;
+
+	__raw_writel(con, reg);
+	return 0;
+}
+
+static int s3c64xx_pclk_ctrl(struct clk *clk, int enable)
+{
+	return s3c64xx_gate(S3C_PCLK_GATE, clk, enable);
+}
+
+static int s3c64xx_hclk_ctrl(struct clk *clk, int enable)
+{
+	return s3c64xx_gate(S3C_HCLK_GATE, clk, enable);
+}
+
+static int s3c6xx_sclk_ctrl(struct clk *clk, int enable)
+{
+	return s3c64xx_gate(S3C_SCLK_GATE, clk, enable);
+}
+
+static struct clk init_clocks_disable[] = {
+	{
+		.name		= "nand",
+		.id		= -1,
+		.parent		= &clk_h,
+	}, {
+		.name		= "adc",
+		.id		= -1,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_TSADC,
+	}, {
+		.name		= "i2c",
+		.id		= -1,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_IIC,
+	}, {
+		.name		= "iis",
+		.id		= 0,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_IIS0,
+	}, {
+		.name		= "iis",
+		.id		= 1,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_IIS1,
+	}, {
+		.name		= "spi",
+		.id		= 0,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_SPI0,
+	}, {
+		.name		= "spi",
+		.id		= 1,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_SPI1,
+	}, {
+		.name		= "48m",
+		.id		= 0,
+		.parent		= &clk_48m,
+		.enable		= s3c64xx_sclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_SCLK_MMC0_48,
+	}, {
+		.name		= "48m",
+		.id		= 1,
+		.parent		= &clk_48m,
+		.enable		= s3c64xx_sclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_SCLK_MMC1_48,
+	}, {
+		.name		= "48m",
+		.id		= 2,
+		.parent		= &clk_48m,
+		.enable		= s3c64xx_sclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_SCLK_MMC2_48,
+	},
+};
+
+static struct clk init_clocks[] = {
+	{
+		.name		= "lcd",
+		.id		= -1,
+		.parent		= &clk_h,
+		.enable		= s3c64xx_hclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_HCLK_LCD,
+	}, {
+		.name		= "gpio",
+		.id		= -1,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_GPIO,
+	}, {
+		.name		= "usb-host",
+		.id		= -1,
+		.parent		= &clk_h,
+		.enable		= s3c64xx_hclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_SCLK_UHOST,
+	}, {
+		.name		= "hsmmc",
+		.id		= 0,
+		.parent		= &clk_h,
+		.enable		= s3c64xx_hclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_HCLK_HSMMC0,
+	}, {
+		.name		= "hsmmc",
+		.id		= 1,
+		.parent		= &clk_h,
+		.enable		= s3c64xx_hclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_HCLK_HSMMC1,
+	}, {
+		.name		= "hsmmc",
+		.id		= 2,
+		.parent		= &clk_h,
+		.enable		= s3c64xx_hclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_HCLK_HSMMC2,
+	}, {
+		.name		= "timers",
+		.id		= -1,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_PWM,
+	}, {
+		.name		= "uart",
+		.id		= 0,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_UART0,
+	}, {
+		.name		= "uart",
+		.id		= 1,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_UART1,
+	}, {
+		.name		= "uart",
+		.id		= 2,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_UART2,
+	}, {
+		.name		= "uart",
+		.id		= 3,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_UART3,
+	}, {
+		.name		= "rtc",
+		.id		= -1,
+		.parent		= &clk_p,
+		.enable		= s3c64xx_pclk_ctrl,
+		.ctrlbit	= S3C_CLKCON_PCLK_RTC,
+	}, {
+		.name		= "watchdog",
+		.id		= -1,
+		.parent		= &clk_p,
+		.ctrlbit	= S3C_CLKCON_PCLK_WDT,
+	}, {
+		.name		= "ac97",
+		.id		= -1,
+		.parent		= &clk_p,
+		.ctrlbit	= S3C_CLKCON_PCLK_AC97,
+	}
+};
+
+static struct clk *clks[] __initdata = {
+	&clk_ext,
+	&clk_epll,
+	&clk_27m,
+	&clk_48m,
+};
+
+void s3c64xx_register_clocks(void)
+{
+	struct clk *clkp;
+	int ret;
+	int ptr;
+
+	s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));
+
+	clkp = init_clocks;
+	for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
+		ret = s3c24xx_register_clock(clkp);
+		if (ret < 0) {
+			printk(KERN_ERR "Failed to register clock %s (%d)\n",
+			       clkp->name, ret);
+		}
+	}
+
+	clkp = init_clocks_disable;
+	for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
+
+		ret = s3c24xx_register_clock(clkp);
+		if (ret < 0) {
+			printk(KERN_ERR "Failed to register clock %s (%d)\n",
+			       clkp->name, ret);
+		}
+
+		(clkp->enable)(clkp, 0);
+	}
+}