clk: add highbank clock support

This adds real clock support to Calxeda Highbank SOC using the common
clock infrastructure.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
[mturquette@linaro.org: fixed up invalid writes to const struct member]
Signed-off-by: Mike Turquette <mturquette@linaro.org>

5 files changed, 99 insertions, 64 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 6f8cf405d3e..f3c60ff4169 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -352,6 +352,7 @@ config ARCH_HIGHBANK
 	select ARM_TIMER_SP804
 	select CACHE_L2X0
 	select CLKDEV_LOOKUP
+	select COMMON_CLK
 	select CPU_V7
 	select GENERIC_CLOCKEVENTS
 	select HAVE_ARM_SCU
diff --git a/arch/arm/boot/dts/highbank.dts b/arch/arm/boot/dts/highbank.dts
index 83e72294aef..2e1cfa00c25 100644
--- a/arch/arm/boot/dts/highbank.dts
+++ b/arch/arm/boot/dts/highbank.dts
@@ -1,5 +1,5 @@
 /*
- * Copyright 2011 Calxeda, Inc.
+ * Copyright 2011-2012 Calxeda, Inc.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -24,6 +24,7 @@
 	compatible = "calxeda,highbank";
 	#address-cells = <1>;
 	#size-cells = <1>;
+	clock-ranges;
 
 	cpus {
 		#address-cells = <1>;
@@ -33,24 +34,32 @@
 			compatible = "arm,cortex-a9";
 			reg = <0>;
 			next-level-cache = <&L2>;
+			clocks = <&a9pll>;
+			clock-names = "cpu";
 		};
 
 		cpu@1 {
 			compatible = "arm,cortex-a9";
 			reg = <1>;
 			next-level-cache = <&L2>;
+			clocks = <&a9pll>;
+			clock-names = "cpu";
 		};
 
 		cpu@2 {
 			compatible = "arm,cortex-a9";
 			reg = <2>;
 			next-level-cache = <&L2>;
+			clocks = <&a9pll>;
+			clock-names = "cpu";
 		};
 
 		cpu@3 {
 			compatible = "arm,cortex-a9";
 			reg = <3>;
 			next-level-cache = <&L2>;
+			clocks = <&a9pll>;
+			clock-names = "cpu";
 		};
 	};
 
@@ -75,12 +84,14 @@
 			compatible = "arm,cortex-a9-twd-timer";
 			reg = <0xfff10600 0x20>;
 			interrupts = <1 13 0xf01>;
+			clocks = <&a9periphclk>;
 		};
 
 		watchdog@fff10620 {
 			compatible = "arm,cortex-a9-twd-wdt";
 			reg = <0xfff10620 0x20>;
 			interrupts = <1 14 0xf01>;
+			clocks = <&a9periphclk>;
 		};
 
 		intc: interrupt-controller@fff11000 {
@@ -116,12 +127,15 @@
 			compatible = "calxeda,hb-sdhci";
 			reg = <0xffe0e000 0x1000>;
 			interrupts = <0 90 4>;
+			clocks = <&eclk>;
 		};
 
 		ipc@fff20000 {
 			compatible = "arm,pl320", "arm,primecell";
 			reg = <0xfff20000 0x1000>;
 			interrupts = <0 7 4>;
+			clocks = <&pclk>;
+			clock-names = "apb_pclk";
 		};
 
 		gpioe: gpio@fff30000 {
@@ -130,6 +144,8 @@
 			gpio-controller;
 			reg = <0xfff30000 0x1000>;
 			interrupts = <0 14 4>;
+			clocks = <&pclk>;
+			clock-names = "apb_pclk";
 		};
 
 		gpiof: gpio@fff31000 {
@@ -138,6 +154,8 @@
 			gpio-controller;
 			reg = <0xfff31000 0x1000>;
 			interrupts = <0 15 4>;
+			clocks = <&pclk>;
+			clock-names = "apb_pclk";
 		};
 
 		gpiog: gpio@fff32000 {
@@ -146,6 +164,8 @@
 			gpio-controller;
 			reg = <0xfff32000 0x1000>;
 			interrupts = <0 16 4>;
+			clocks = <&pclk>;
+			clock-names = "apb_pclk";
 		};
 
 		gpioh: gpio@fff33000 {
@@ -154,24 +174,32 @@
 			gpio-controller;
 			reg = <0xfff33000 0x1000>;
 			interrupts = <0 17 4>;
+			clocks = <&pclk>;
+			clock-names = "apb_pclk";
 		};
 
 		timer {
 			compatible = "arm,sp804", "arm,primecell";
 			reg = <0xfff34000 0x1000>;
 			interrupts = <0 18 4>;
+			clocks = <&pclk>;
+			clock-names = "apb_pclk";
 		};
 
 		rtc@fff35000 {
 			compatible = "arm,pl031", "arm,primecell";
 			reg = <0xfff35000 0x1000>;
 			interrupts = <0 19 4>;
+			clocks = <&pclk>;
+			clock-names = "apb_pclk";
 		};
 
 		serial@fff36000 {
 			compatible = "arm,pl011", "arm,primecell";
 			reg = <0xfff36000 0x1000>;
 			interrupts = <0 20 4>;
+			clocks = <&pclk>;
+			clock-names = "apb_pclk";
 		};
 
 		smic@fff3a000 {
@@ -186,12 +214,73 @@
 		sregs@fff3c000 {
 			compatible = "calxeda,hb-sregs";
 			reg = <0xfff3c000 0x1000>;
+
+			clocks {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				osc: oscillator {
+					#clock-cells = <0>;
+					compatible = "fixed-clock";
+					clock-frequency = <33333000>;
+				};
+
+				ddrpll: ddrpll {
+					#clock-cells = <0>;
+					compatible = "calxeda,hb-pll-clock";
+					clocks = <&osc>;
+					reg = <0x108>;
+				};
+
+				a9pll: a9pll {
+					#clock-cells = <0>;
+					compatible = "calxeda,hb-pll-clock";
+					clocks = <&osc>;
+					reg = <0x100>;
+				};
+
+				a9periphclk: a9periphclk {
+					#clock-cells = <0>;
+					compatible = "calxeda,hb-a9periph-clock";
+					clocks = <&a9pll>;
+					reg = <0x104>;
+				};
+
+				a9bclk: a9bclk {
+					#clock-cells = <0>;
+					compatible = "calxeda,hb-a9bus-clock";
+					clocks = <&a9pll>;
+					reg = <0x104>;
+				};
+
+				emmcpll: emmcpll {
+					#clock-cells = <0>;
+					compatible = "calxeda,hb-pll-clock";
+					clocks = <&osc>;
+					reg = <0x10C>;
+				};
+
+				eclk: eclk {
+					#clock-cells = <0>;
+					compatible = "calxeda,hb-emmc-clock";
+					clocks = <&emmcpll>;
+					reg = <0x114>;
+				};
+
+				pclk: pclk {
+					#clock-cells = <0>;
+					compatible = "fixed-clock";
+					clock-frequency = <150000000>;
+				};
+			};
 		};
 
 		dma@fff3d000 {
 			compatible = "arm,pl330", "arm,primecell";
 			reg = <0xfff3d000 0x1000>;
 			interrupts = <0 92 4>;
+			clocks = <&pclk>;
+			clock-names = "apb_pclk";
 		};
 
 		ethernet@fff50000 {
diff --git a/arch/arm/mach-highbank/Makefile b/arch/arm/mach-highbank/Makefile
index ded4652ada8..3ec8bdd25d0 100644
--- a/arch/arm/mach-highbank/Makefile
+++ b/arch/arm/mach-highbank/Makefile
@@ -1,4 +1,4 @@
-obj-y					:= clock.o highbank.o system.o smc.o
+obj-y					:= highbank.o system.o smc.o
 
 plus_sec := $(call as-instr,.arch_extension sec,+sec)
 AFLAGS_smc.o				:=-Wa,-march=armv7-a$(plus_sec)
diff --git a/arch/arm/mach-highbank/clock.c b/arch/arm/mach-highbank/clock.c
deleted file mode 100644
index c25a2ae4fde..00000000000
--- a/arch/arm/mach-highbank/clock.c
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * Copyright 2011 Calxeda, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/clk.h>
-#include <linux/clkdev.h>
-
-struct clk {
-	unsigned long rate;
-};
-
-int clk_enable(struct clk *clk)
-{
-	return 0;
-}
-
-void clk_disable(struct clk *clk)
-{}
-
-unsigned long clk_get_rate(struct clk *clk)
-{
-	return clk->rate;
-}
-
-long clk_round_rate(struct clk *clk, unsigned long rate)
-{
-	return clk->rate;
-}
-
-int clk_set_rate(struct clk *clk, unsigned long rate)
-{
-	return 0;
-}
-
-static struct clk eclk = { .rate = 200000000 };
-static struct clk pclk = { .rate = 150000000 };
-
-static struct clk_lookup lookups[] = {
-	{ .clk = &pclk, .con_id = "apb_pclk", },
-	{ .clk = &pclk, .dev_id = "sp804", },
-	{ .clk = &eclk, .dev_id = "ffe0e000.sdhci", },
-	{ .clk = &pclk, .dev_id = "fff36000.serial", },
-};
-
-void __init highbank_clocks_init(void)
-{
-	clkdev_add_table(lookups, ARRAY_SIZE(lookups));
-}
diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c
index 8777612b1a4..d75b0a78d88 100644
--- a/arch/arm/mach-highbank/highbank.c
+++ b/arch/arm/mach-highbank/highbank.c
@@ -105,6 +105,11 @@ static void __init highbank_init_irq(void)
 #endif
 }
 
+static struct clk_lookup lookup = {
+	.dev_id = "sp804",
+	.con_id = NULL,
+};
+
 static void __init highbank_timer_init(void)
 {
 	int irq;
@@ -122,6 +127,8 @@ static void __init highbank_timer_init(void)
 	irq = irq_of_parse_and_map(np, 0);
 
 	highbank_clocks_init();
+	lookup.clk = of_clk_get(np, 0);
+	clkdev_add(&lookup);
 
 	sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1");
 	sp804_clockevents_init(timer_base, irq, "timer0");