From: Florian Fainelli <florian@openwrt.org>
Date: Thu, 6 Dec 2012 22:39:52 +0000 (+0000)
Subject: provide a system clock to be used by the MIPS timer
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=e37f6fb458314d24de119b9bba1b8a28a9379839;p=librecmc%2Flibrecmc.git

provide a system clock to be used by the MIPS timer

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 34550
---

diff --git a/target/linux/adm8668/files/arch/mips/adm8668/Makefile b/target/linux/adm8668/files/arch/mips/adm8668/Makefile
index ed45666194..aff789c7d2 100644
--- a/target/linux/adm8668/files/arch/mips/adm8668/Makefile
+++ b/target/linux/adm8668/files/arch/mips/adm8668/Makefile
@@ -3,5 +3,5 @@
 #
 
 obj-y	 	:= irq.o pci.o prom.o platform.o proc.o \
-		   setup.o time.o early_printk.o clock.o \
+		   setup.o clock.o time.o early_printk.o \
 		   net_core.o net_intr.o
diff --git a/target/linux/adm8668/files/arch/mips/adm8668/clock.c b/target/linux/adm8668/files/arch/mips/adm8668/clock.c
index 96d139e177..6c839a2474 100644
--- a/target/linux/adm8668/files/arch/mips/adm8668/clock.c
+++ b/target/linux/adm8668/files/arch/mips/adm8668/clock.c
@@ -22,12 +22,19 @@ static struct clk uart_clk = {
 	.rate	= ADM8668_UARTCLK_FREQ,
 };
 
+static struct clk sys_clk;
+
 struct clk *clk_get(struct device *dev, const char *id)
 {
-	const char *name = dev_name(dev);
+	const char *lookup = id;
+
+	if (dev)
+		lookup = dev_name(dev);
 
-	if (!strcmp(name, "apb:uart0"))
+	if (!strcmp(lookup, "apb:uart0"))
 		return &uart_clk;
+	if (!strcmp(lookup, "sys"))
+		return &sys_clk;
 
 	return ERR_PTR(-ENOENT);
 }
@@ -54,3 +61,16 @@ void clk_put(struct clk *clk)
 {
 }
 EXPORT_SYMBOL(clk_put);
+
+void __init adm8668_init_clocks(void)
+{
+	u32 adj;
+
+	/* adjustable clock selection
+	 * CR3 bit 14~11, 0000 -> 175MHz, 0001 -> 180MHz, etc...
+	 */
+	adj = (ADM8668_CONFIG_REG(ADM8668_CR3) >> 11) & 0xf;
+	sys_clk.rate = SYS_CLOCK + adj * 5000000;
+
+	pr_info("ADM8668 CPU clock: %lu MHz\n", sys_clk.rate / 1000000);
+}
diff --git a/target/linux/adm8668/files/arch/mips/adm8668/time.c b/target/linux/adm8668/files/arch/mips/adm8668/time.c
index 047bccdedd..87bdd66965 100644
--- a/target/linux/adm8668/files/arch/mips/adm8668/time.c
+++ b/target/linux/adm8668/files/arch/mips/adm8668/time.c
@@ -1,17 +1,20 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/clk.h>
 
 #include <asm/time.h>
 #include <adm8668.h>
 
 void __init plat_time_init(void)
 {
-	int adj = (ADM8668_CONFIG_REG(ADM8668_CR3) >> 11) & 0xf;
+	struct clk *sys_clk;
 
-	/* adjustable clock selection
-	   CR3 bit 14~11, 0000 -> 175MHz, 0001 -> 180MHz, etc... */
+	adm8668_init_clocks();
 
-	mips_hpt_frequency = (SYS_CLOCK + adj * 5000000) / 2;
-	printk("ADM8668 CPU clock: %d MHz\n", 2*mips_hpt_frequency / 1000000);
+	sys_clk = clk_get(NULL, "sys");
+	if (IS_ERR(sys_clk))
+		panic("unable to get system clock\n");
+
+	mips_hpt_frequency = clk_get_rate(sys_clk) / 2;
 }
 
diff --git a/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h b/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h
index 1f7ab72cad..bb4466c522 100644
--- a/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h
+++ b/target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/adm8668.h
@@ -109,4 +109,6 @@
 #define CRGPIO_TOGGLE(num)	\
 	ADM8668_CONFIG_REG(CRGPIO_REG) ^= (1 << (6 + num))
 
+void adm8668_init_clocks(void);
+
 #endif /* __ADM8668_H__ */