ramips: implement clock API for RT305X

SVN-Revision: 25124

target/linux/ramips/files/arch/mips/include/asm/mach-ralink/rt305x.h

@@ -1,7 +1,7 @@
 /*
  * Ralink RT305x SoC specific definitions
  *
- * Copyright (C) 2009 Gabor Juhos <[email protected]>
+ * Copyright (C) 2009-2011 Gabor Juhos <[email protected]>
  *
  * Parts of this file are based on Ralink's 2.6.21 BSP
  *
@@ -17,10 +17,6 @@
 #include <linux/io.h>
 
 void rt305x_detect_sys_type(void);
-void rt305x_detect_sys_freq(void);
-
-extern unsigned long rt305x_cpu_freq;
-extern unsigned long rt305x_sys_freq;
 
 #define RT305X_MEM_SIZE_MIN (2 * 1024 * 1024)
 #define RT305X_MEM_SIZE_MAX (64 * 1024 * 1024)

target/linux/ramips/files/arch/mips/ralink/rt305x/Makefile

@@ -1,13 +1,13 @@
 #
 # Makefile for the Ralink RT305x SoC specific parts of the kernel
 #
-# Copyright (C) 2009 Gabor Juhos <[email protected]>
+# Copyright (C) 2009-2011 Gabor Juhos <[email protected]>
 #
 # This program is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License version 2 as published
 # by the Free Software Foundation.
 
-obj-y	:= irq.o setup.o devices.o rt305x.o
+obj-y	:= irq.o setup.o devices.o rt305x.o clock.o
 
 obj-$(CONFIG_EARLY_PRINTK)		+= early_printk.o
 

target/linux/ramips/files/arch/mips/ralink/rt305x/clock.c

@@ -0,0 +1,93 @@
+/*
+ *  Ralink RT305X clock API
+ *
+ *  Copyright (C) 2011 Gabor Juhos <[email protected]>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+
+#include <asm/mach-ralink/common.h>
+#include <asm/mach-ralink/rt305x.h>
+#include <asm/mach-ralink/rt305x_regs.h>
+#include "common.h"
+
+struct clk {
+	unsigned long rate;
+};
+
+static struct clk rt305x_cpu_clk;
+static struct clk rt305x_sys_clk;
+static struct clk rt305x_wdt_clk;
+static struct clk rt305x_uart_clk;
+
+void __init rt305x_clocks_init(void)
+{
+	u32	t;
+
+	t = rt305x_sysc_rr(SYSC_REG_SYSTEM_CONFIG);
+	t = ((t >> SYSTEM_CONFIG_CPUCLK_SHIFT) & SYSTEM_CONFIG_CPUCLK_MASK);
+
+	switch (t) {
+	case SYSTEM_CONFIG_CPUCLK_320:
+		rt305x_cpu_clk.rate = 320000000;
+		break;
+	case SYSTEM_CONFIG_CPUCLK_384:
+		rt305x_cpu_clk.rate = 384000000;
+		break;
+	}
+
+	rt305x_sys_clk.rate = rt305x_cpu_clk.rate / 3;
+	rt305x_uart_clk.rate = rt305x_sys_clk.rate;
+	rt305x_wdt_clk.rate = rt305x_sys_clk.rate;
+}
+
+/*
+ * Linux clock API
+ */
+struct clk *clk_get(struct device *dev, const char *id)
+{
+	if (!strcmp(id, "sys"))
+		return &rt305x_sys_clk;
+
+	if (!strcmp(id, "cpu"))
+		return &rt305x_cpu_clk;
+
+	if (!strcmp(id, "wdt"))
+		return &rt305x_wdt_clk;
+
+	if (!strcmp(id, "uart"))
+		return &rt305x_uart_clk;
+
+	return ERR_PTR(-ENOENT);
+}
+EXPORT_SYMBOL(clk_get);
+
+int clk_enable(struct clk *clk)
+{
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	return clk->rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+void clk_put(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_put);

target/linux/ramips/files/arch/mips/ralink/rt305x/common.h

@@ -0,0 +1,16 @@
+/*
+ * Ralink RT305x SoC common defines
+ *
+ * Copyright (C) 2011 Gabor Juhos <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#ifndef _RT305X_COMMON_H
+#define _RT305X_COMMON_H
+
+void rt305x_clocks_init(void);
+
+#endif /*  _RT305X_COMMON_H */

target/linux/ramips/files/arch/mips/ralink/rt305x/devices.c

@@ -10,6 +10,8 @@
 
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/clk.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/physmap.h>
 
@@ -150,7 +152,13 @@ static struct platform_device rt305x_esw_device = {
 
 void __init rt305x_register_ethernet(void)
 {
-	ramips_eth_data.sys_freq = rt305x_sys_freq;
+	struct clk *clk;
+
+	clk = clk_get(NULL, "sys");
+	if (IS_ERR(clk))
+		panic("unable to get SYS clock, err=%ld", PTR_ERR(clk));
+
+	ramips_eth_data.sys_freq = clk_get_rate(clk);
 
 	platform_device_register(&rt305x_esw_device);
 	platform_device_register(&rt305x_eth_device);

target/linux/ramips/files/arch/mips/ralink/rt305x/rt305x.c

@@ -1,7 +1,7 @@
 /*
  * Ralink RT305x SoC specific setup
  *
- * Copyright (C) 2008-2009 Gabor Juhos <[email protected]>
+ * Copyright (C) 2008-2011 Gabor Juhos <[email protected]>
  * Copyright (C) 2008 Imre Kaloz <[email protected]>
  *
  * Parts of this file are based on Ralink's 2.6.21 BSP
@@ -20,12 +20,6 @@
 #include <asm/mach-ralink/rt305x.h>
 #include <asm/mach-ralink/rt305x_regs.h>
 
-unsigned long rt305x_cpu_freq;
-EXPORT_SYMBOL_GPL(rt305x_cpu_freq);
-
-unsigned long rt305x_sys_freq;
-EXPORT_SYMBOL_GPL(rt305x_sys_freq);
-
 void __iomem * rt305x_sysc_base;
 void __iomem * rt305x_memc_base;
 
@@ -49,25 +43,6 @@ void __init rt305x_detect_sys_type(void)
 		(id & CHIP_ID_REV_MASK));
 }
 
-void __init rt305x_detect_sys_freq(void)
-{
-	u32	t;
-
-	t = rt305x_sysc_rr(SYSC_REG_SYSTEM_CONFIG);
-	t = ((t >> SYSTEM_CONFIG_CPUCLK_SHIFT) & SYSTEM_CONFIG_CPUCLK_MASK);
-
-	switch (t) {
-	case SYSTEM_CONFIG_CPUCLK_320:
-		rt305x_cpu_freq = 320000000;
-		break;
-	case SYSTEM_CONFIG_CPUCLK_384:
-		rt305x_cpu_freq = 384000000;
-		break;
-	}
-
-	rt305x_sys_freq = rt305x_cpu_freq / 3;
-}
-
 static void rt305x_gpio_reserve(int first, int last)
 {
 	for (; first <= last; first++)

target/linux/ramips/files/arch/mips/ralink/rt305x/setup.c

@@ -1,7 +1,7 @@
 /*
  * Ralink RT305x SoC specific setup
  *
- * Copyright (C) 2008 Gabor Juhos <[email protected]>
+ * Copyright (C) 2008-2011 Gabor Juhos <[email protected]>
  *
  * Parts of this file are based on Ralink's 2.6.21 BSP
  *
@@ -13,6 +13,8 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/err.h>
+#include <linux/clk.h>
 
 #include <asm/mips_machine.h>
 #include <asm/reboot.h>
@@ -21,6 +23,7 @@
 #include <asm/mach-ralink/common.h>
 #include <asm/mach-ralink/rt305x.h>
 #include <asm/mach-ralink/rt305x_regs.h>
+#include "common.h"
 
 static void rt305x_restart(char *command)
 {
@@ -44,27 +47,43 @@ unsigned int __cpuinit get_c0_compare_irq(void)
 
 void __init ramips_soc_setup(void)
 {
+	struct clk *clk;
+
 	rt305x_sysc_base = ioremap_nocache(RT305X_SYSC_BASE, PAGE_SIZE);
 	rt305x_memc_base = ioremap_nocache(RT305X_MEMC_BASE, PAGE_SIZE);
 
 	rt305x_detect_sys_type();
-	rt305x_detect_sys_freq();
+	rt305x_clocks_init();
+
+	clk = clk_get(NULL, "cpu");
+	if (IS_ERR(clk))
+		panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
 
 	printk(KERN_INFO "%s running at %lu.%02lu MHz\n", ramips_sys_type,
-		rt305x_cpu_freq / 1000000,
-		(rt305x_cpu_freq % 1000000) * 100 / 1000000);
+		clk_get_rate(clk) / 1000000,
+		(clk_get_rate(clk) % 1000000) * 100 / 1000000);
 
 	_machine_restart = rt305x_restart;
 	_machine_halt = rt305x_halt;
 	pm_power_off = rt305x_halt;
 
-	ramips_early_serial_setup(0, RT305X_UART0_BASE, rt305x_sys_freq,
+	clk = clk_get(NULL, "uart");
+	if (IS_ERR(clk))
+		panic("unable to get UART clock, err=%ld", PTR_ERR(clk));
+
+	ramips_early_serial_setup(0, RT305X_UART0_BASE, clk_get_rate(clk),
 				  RT305X_INTC_IRQ_UART0);
-	ramips_early_serial_setup(1, RT305X_UART1_BASE, rt305x_sys_freq,
+	ramips_early_serial_setup(1, RT305X_UART1_BASE, clk_get_rate(clk),
 				  RT305X_INTC_IRQ_UART1);
 }
 
 void __init plat_time_init(void)
 {
-	mips_hpt_frequency = rt305x_cpu_freq / 2;
+	struct clk *clk;
+
+	clk = clk_get(NULL, "cpu");
+	if (IS_ERR(clk))
+		panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
+
+	mips_hpt_frequency = clk_get_rate(clk) / 2;
 }