[ARM] Convert SA1111 to use clock architecture

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 133 insertions, 1 deletions

diff --git a/arch/arm/mach-sa1100/Makefile b/arch/arm/mach-sa1100/Makefile
index e4a4a3e8aa8f..e27f15042a22 100644
--- a/arch/arm/mach-sa1100/Makefile
+++ b/arch/arm/mach-sa1100/Makefile
@@ -3,7 +3,7 @@
 #
 
 # Common support
-obj-y := generic.o irq.o dma.o time.o
+obj-y := clock.o generic.o irq.o dma.o time.o #nmi-oopser.o
 obj-m :=
 obj-n :=
 obj-  :=
diff --git a/arch/arm/mach-sa1100/clock.c b/arch/arm/mach-sa1100/clock.c
new file mode 100644
index 000000000000..b1e8fd766c1a
--- /dev/null
+++ b/arch/arm/mach-sa1100/clock.c
@@ -0,0 +1,132 @@
+/*
+ *  linux/arch/arm/mach-sa1100/clock.c
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/clk.h>
+#include <linux/spinlock.h>
+
+#include <asm/hardware.h>
+#include <asm/semaphore.h>
+
+struct clk {
+        struct list_head        node;
+        unsigned long           rate;
+        struct module           *owner;
+        const char              *name;
+        unsigned int            enabled;
+        void                    (*enable)(void);
+        void                    (*disable)(void);
+};
+
+static LIST_HEAD(clocks);
+static DECLARE_MUTEX(clocks_sem);
+static DEFINE_SPINLOCK(clocks_lock);
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+        struct clk *p, *clk = ERR_PTR(-ENOENT);
+
+        down(&clocks_sem);
+        list_for_each_entry(p, &clocks, node) {
+                if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
+                        clk = p;
+                        break;
+                }
+        }
+        up(&clocks_sem);
+
+        return clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+        module_put(clk->owner);
+}
+EXPORT_SYMBOL(clk_put);
+
+int clk_enable(struct clk *clk)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&clocks_lock, flags);
+        if (clk->enabled++ == 0)
+                clk->enable();
+        spin_unlock_irqrestore(&clocks_lock, flags);
+        return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+        unsigned long flags;
+
+        WARN_ON(clk->enabled == 0);
+
+        spin_lock_irqsave(&clocks_lock, flags);
+        if (--clk->enabled == 0)
+                clk->disable();
+        spin_unlock_irqrestore(&clocks_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+        return clk->rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+
+static void clk_gpio27_enable(void)
+{
+        /*
+         * First, set up the 3.6864MHz clock on GPIO 27 for the SA-1111:
+         * (SA-1110 Developer's Manual, section 9.1.2.1)
+         */
+        GAFR |= GPIO_32_768kHz;
+        GPDR |= GPIO_32_768kHz;
+        TUCR = TUCR_3_6864MHz;
+}
+
+static void clk_gpio27_disable(void)
+{
+        TUCR = 0;
+        GPDR &= ~GPIO_32_768kHz;
+        GAFR &= ~GPIO_32_768kHz;
+}
+
+static struct clk clk_gpio27 = {
+        .name           = "GPIO27_CLK",
+        .rate           = 3686400,
+        .enable         = clk_gpio27_enable,
+        .disable        = clk_gpio27_disable,
+};
+
+int clk_register(struct clk *clk)
+{
+        down(&clocks_sem);
+        list_add(&clk->node, &clocks);
+        up(&clocks_sem);
+        return 0;
+}
+EXPORT_SYMBOL(clk_register);
+
+void clk_unregister(struct clk *clk)
+{
+        down(&clocks_sem);
+        list_del(&clk->node);
+        up(&clocks_sem);
+}
+EXPORT_SYMBOL(clk_unregister);
+
+static int __init clk_init(void)
+{
+        clk_register(&clk_gpio27);
+        return 0;
+}
+arch_initcall(clk_init);