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 6f8cf405d3ec..f3c60ff41692 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 83e72294aefb..2e1cfa00c25b 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 ded4652ada80..3ec8bdd25d09 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 c25a2ae4fde1..000000000000
--- 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 8777612b1a42..d75b0a78d88a 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");