[ARM] Convert SA1111 to use clock architecture

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

5 files changed, 278 insertions, 23 deletions

diff --git a/arch/arm/common/sa1111.c b/arch/arm/common/sa1111.c
index 93352f6097c1..5ba1ee042349 100644
--- a/arch/arm/common/sa1111.c
+++ b/arch/arm/common/sa1111.c
@@ -26,6 +26,7 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/dma-mapping.h>
+#include <linux/clk.h>
 
 #include <asm/hardware.h>
 #include <asm/mach-types.h>
@@ -36,10 +37,6 @@
 
 #include <asm/hardware/sa1111.h>
 
-#ifdef CONFIG_ARCH_PXA
-#include <asm/arch/pxa-regs.h>
-#endif
-
 extern void __init sa1110_mb_enable(void);
 
 /*
@@ -51,6 +48,7 @@ extern void __init sa1110_mb_enable(void);
  */
 struct sa1111 {
         struct device   *dev;
+        struct clk      *clk;
         unsigned long   phys;
         int             irq;
         spinlock_t      lock;
@@ -451,19 +449,7 @@ static void sa1111_wake(struct sa1111 *sachip)
 
         spin_lock_irqsave(&sachip->lock, flags);
 
-#ifdef CONFIG_ARCH_SA1100
-        /*
-         * 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;
-#elif CONFIG_ARCH_PXA
-        pxa_gpio_mode(GPIO11_3_6MHz_MD);
-#else
-#error missing clock setup
-#endif
+        clk_enable(sachip->clk);
 
         /*
          * Turn VCO on, and disable PLL Bypass.
@@ -641,6 +627,12 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
 
         memset(sachip, 0, sizeof(struct sa1111));
 
+        sachip->clk = clk_get(me, "GPIO27_CLK");
+        if (!sachip->clk) {
+                ret = PTR_ERR(sachip->clk);
+                goto err_free;
+        }
+
         spin_lock_init(&sachip->lock);
 
         sachip->dev = me;
@@ -656,7 +648,7 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
         sachip->base = ioremap(mem->start, PAGE_SIZE * 2);
         if (!sachip->base) {
                 ret = -ENOMEM;
-                goto out;
+                goto err_clkput;
         }
 
         /*
@@ -666,7 +658,7 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
         if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
                 printk(KERN_DEBUG "SA1111 not detected: ID = %08lx\n", id);
                 ret = -ENODEV;
-                goto unmap;
+                goto err_unmap;
         }
 
         printk(KERN_INFO "SA1111 Microprocessor Companion Chip: "
@@ -726,9 +718,11 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
 
         return 0;
 
- unmap:
+ err_unmap:
         iounmap(sachip->base);
- out:
+ err_clkput:
+        clk_put(sachip->clk);
+ err_free:
         kfree(sachip);
         return ret;
 }
@@ -751,6 +745,8 @@ static void __sa1111_remove(struct sa1111 *sachip)
         sa1111_writel(0, irqbase + SA1111_WAKEEN0);
         sa1111_writel(0, irqbase + SA1111_WAKEEN1);
 
+        clk_disable(sachip->clk);
+
         if (sachip->irq != NO_IRQ) {
                 set_irq_chained_handler(sachip->irq, NULL);
                 set_irq_data(sachip->irq, NULL);
@@ -759,6 +755,7 @@ static void __sa1111_remove(struct sa1111 *sachip)
         }
 
         iounmap(sachip->base);
+        clk_put(sachip->clk);
         kfree(sachip);
 }
 
@@ -857,6 +854,8 @@ static int sa1111_suspend(struct platform_device *dev, pm_message_t state)
         sa1111_writel(0, sachip->base + SA1111_SKPWM0);
         sa1111_writel(0, sachip->base + SA1111_SKPWM1);
 
+        clk_disable(sachip->clk);
+
         spin_unlock_irqrestore(&sachip->lock, flags);
 
         return 0;
diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile
index 32526a0a6f86..382644401a4d 100644
--- a/arch/arm/mach-pxa/Makefile
+++ b/arch/arm/mach-pxa/Makefile
@@ -3,7 +3,7 @@
 #
 
 # Common support (must be linked before board specific support)
-obj-y += generic.o irq.o dma.o time.o
+obj-y += clock.o generic.o irq.o dma.o time.o
 obj-$(CONFIG_PXA25x) += pxa25x.o
 obj-$(CONFIG_PXA27x) += pxa27x.o
 
diff --git a/arch/arm/mach-pxa/clock.c b/arch/arm/mach-pxa/clock.c
new file mode 100644
index 000000000000..8f7c90a0593b
--- /dev/null
+++ b/arch/arm/mach-pxa/clock.c
@@ -0,0 +1,124 @@
+/*
+ *  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/arch/pxa-regs.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)
+{
+        pxa_gpio_mode(GPIO11_3_6MHz_MD);
+}
+
+static void clk_gpio27_disable(void)
+{
+}
+
+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);
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);