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Date: Thu, 30 Oct 2008 13:35:09 +0100
From: "Miguel Ángel Álvarez" <gotzoncabanes@...il.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] ixp4xx: clock API
Hi.
This is and implementation of clock API for IXP4XX based on PXA2XX.
(linux-2.6.27.4). I would appreciate comments on it.
Signed-off-by: Miguel Angel Alvarez <gotzoncabanes@...il.com>
---
diff -uprN linux-2.6.27.4_orig/arch/arm/mach-ixp4xx/clock.c
linux-2.6.27.4/arch/arm/mach-ixp4xx/clock.c
--- linux-2.6.27.4_orig/arch/arm/mach-ixp4xx/clock.c 1970-01-01
01:00:00.000000000 +0100
+++ linux-2.6.27.4/arch/arm/mach-ixp4xx/clock.c 2008-10-30
12:17:01.000000000 +0100
@@ -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 <linux/platform_device.h>
+#include <linux/delay.h>
+
+#include <mach/hardware.h>
+
+#include <mach/clock.h>
+
+static LIST_HEAD(clocks);
+static DEFINE_MUTEX(clocks_mutex);
+static DEFINE_SPINLOCK(clocks_lock);
+
+static struct clk *clk_lookup(struct device *dev, const char *id)
+{
+ struct clk *p;
+
+ list_for_each_entry(p, &clocks, node)
+ if (strcmp(id, p->name) == 0 && p->dev == dev)
+ return p;
+
+ return NULL;
+}
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+ struct clk *p, *clk = ERR_PTR(-ENOENT);
+
+ mutex_lock(&clocks_mutex);
+ p = clk_lookup(dev, id);
+ if (!p)
+ p = clk_lookup(NULL, id);
+ if (p)
+ clk = p;
+ mutex_unlock(&clocks_mutex);
+
+ return clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_put);
+
+int clk_enable(struct clk *clk)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&clocks_lock, flags);
+ if (clk->enabled++ == 0)
+ clk->ops->enable(clk);
+ spin_unlock_irqrestore(&clocks_lock, flags);
+
+ if (clk->delay)
+ udelay(clk->delay);
+
+ 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->ops->disable(clk);
+ spin_unlock_irqrestore(&clocks_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+ unsigned long rate;
+
+ rate = clk->rate;
+ if (clk->ops->getrate)
+ rate = clk->ops->getrate(clk);
+
+ return rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+void clk_void_enable(struct clk *clk)
+{
+}
+
+void clk_void_disable(struct clk *clk)
+{
+}
+
+const struct clkops clk_void_ops = {
+ .enable = clk_void_enable,
+ .disable = clk_void_disable,
+};
+
+static struct clk common_clks[] = {
+ {
+ .name = "SSPCLK",
+ .ops = &clk_void_ops,
+ .rate = 3686400,
+ },
+};
+
+void clks_register(struct clk *clks, size_t num)
+{
+ int i;
+
+ mutex_lock(&clocks_mutex);
+ for (i = 0; i < num; i++)
+ list_add(&clks[i].node, &clocks);
+ mutex_unlock(&clocks_mutex);
+}
+
+static int __init clk_init(void)
+{
+ clks_register(common_clks, ARRAY_SIZE(common_clks));
+ return 0;
+}
+arch_initcall(clk_init);
diff -uprN linux-2.6.27.4_orig/arch/arm/mach-ixp4xx/include/mach/clock.h
linux-2.6.27.4/arch/arm/mach-ixp4xx/include/mach/clock.h
--- linux-2.6.27.4_orig/arch/arm/mach-ixp4xx/include/mach/clock.h
1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.27.4/arch/arm/mach-ixp4xx/include/mach/clock.h
2008-10-30 12:17:19.000000000 +0100
@@ -0,0 +1,44 @@
+struct clk;
+
+struct clkops {
+ void (*enable)(struct clk *);
+ void (*disable)(struct clk *);
+ unsigned long (*getrate)(struct clk *);
+};
+
+struct clk {
+ struct list_head node;
+ const char *name;
+ struct device *dev;
+ const struct clkops *ops;
+ unsigned long rate;
+ unsigned int cken;
+ unsigned int delay;
+ unsigned int enabled;
+};
+
+#define INIT_CKEN(_name, _cken, _rate, _delay, _dev) \
+ { \
+ .name = _name, \
+ .dev = _dev, \
+ .ops = &clk_cken_ops, \
+ .rate = _rate, \
+ .cken = CKEN_##_cken, \
+ .delay = _delay, \
+ }
+
+#define INIT_CK(_name, _cken, _ops, _dev) \
+ { \
+ .name = _name, \
+ .dev = _dev, \
+ .ops = _ops, \
+ .cken = CKEN_##_cken, \
+ }
+
+extern const struct clkops clk_cken_ops;
+
+void clk_cken_enable(struct clk *clk);
+void clk_cken_disable(struct clk *clk);
+
+void clks_register(struct clk *clks, size_t num);
+
diff -uprN linux-2.6.27.4_orig/arch/arm/mach-ixp4xx/Makefile
linux-2.6.27.4/arch/arm/mach-ixp4xx/Makefile
--- linux-2.6.27.4_orig/arch/arm/mach-ixp4xx/Makefile 2008-10-30
12:01:27.000000000 +0100
+++ linux-2.6.27.4/arch/arm/mach-ixp4xx/Makefile 2008-10-30
12:17:46.000000000 +0100
@@ -17,7 +17,7 @@ obj-pci-$(CONFIG_MACH_GATEWAY7001) += ga
obj-pci-$(CONFIG_MACH_WG302V2) += wg302v2-pci.o
obj-pci-$(CONFIG_MACH_FSG) += fsg-pci.o
-obj-y += common.o
+obj-y += common.o clock.o
obj-$(CONFIG_ARCH_IXDP4XX) += ixdp425-setup.o
obj-$(CONFIG_MACH_AVILA) += avila-setup.o
Miguel Ángel Álvarez
--
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