[ARM] Convert SA1111 to use clock architecture

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

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;

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
 

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);

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-  :=

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);