ramips: implement clock API for RT288x

SVN-Revision: 25125

target/linux/ramips/files/arch/mips/include/asm/mach-ralink/rt288x.h

@@ -1,7 +1,7 @@
 /*
  * Ralink RT288x SoC specific definitions
  *
- * 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
@@ -18,10 +18,6 @@
 #include <linux/io.h>
 
 void rt288x_detect_sys_type(void);
-void rt288x_detect_sys_freq(void);
-
-extern unsigned long rt288x_cpu_freq;
-extern unsigned long rt288x_sys_freq;
 
 #define RT288X_CPU_IRQ_BASE	0
 #define RT288X_INTC_IRQ_BASE	8

target/linux/ramips/files/arch/mips/ralink/rt288x/Makefile

@@ -9,7 +9,7 @@
 # under the terms of the GNU General Public License version 2 as published
 # by the Free Software Foundation.
 
-obj-y	:= irq.o setup.o rt288x.o devices.o
+obj-y	:= irq.o setup.o rt288x.o devices.o clock.o
 
 obj-$(CONFIG_EARLY_PRINTK)		+= early_printk.o
 

target/linux/ramips/files/arch/mips/ralink/rt288x/clock.c

@@ -0,0 +1,99 @@
+/*
+ *  Ralink RT288X 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/rt288x.h>
+#include <asm/mach-ralink/rt288x_regs.h>
+#include "common.h"
+
+struct clk {
+	unsigned long rate;
+};
+
+static struct clk rt288x_cpu_clk;
+static struct clk rt288x_sys_clk;
+static struct clk rt288x_wdt_clk;
+static struct clk rt288x_uart_clk;
+
+void __init rt288x_clocks_init(void)
+{
+	u32	t;
+
+	t = rt288x_sysc_rr(SYSC_REG_SYSTEM_CONFIG);
+	t = ((t >> SYSTEM_CONFIG_CPUCLK_SHIFT) & SYSTEM_CONFIG_CPUCLK_MASK);
+
+	switch (t) {
+	case SYSTEM_CONFIG_CPUCLK_250:
+		rt288x_cpu_clk.rate = 250000000;
+		break;
+	case SYSTEM_CONFIG_CPUCLK_266:
+		rt288x_cpu_clk.rate = 266666667;
+		break;
+	case SYSTEM_CONFIG_CPUCLK_280:
+		rt288x_cpu_clk.rate = 280000000;
+		break;
+	case SYSTEM_CONFIG_CPUCLK_300:
+		rt288x_cpu_clk.rate = 300000000;
+		break;
+	}
+
+	rt288x_sys_clk.rate = rt288x_cpu_clk.rate / 2;
+	rt288x_uart_clk.rate = rt288x_sys_clk.rate;
+	rt288x_wdt_clk.rate = rt288x_sys_clk.rate;
+}
+
+/*
+ * Linux clock API
+ */
+struct clk *clk_get(struct device *dev, const char *id)
+{
+	if (!strcmp(id, "sys"))
+		return &rt288x_sys_clk;
+
+	if (!strcmp(id, "cpu"))
+		return &rt288x_cpu_clk;
+
+	if (!strcmp(id, "wdt"))
+		return &rt288x_wdt_clk;
+
+	if (!strcmp(id, "uart"))
+		return &rt288x_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/rt288x/common.h

@@ -0,0 +1,16 @@
+/*
+ * Ralink RT288X 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 _RT288X_COMMON_H
+#define _RT288X_COMMON_H
+
+void rt288x_clocks_init(void);
+
+#endif /*  _RT288X_COMMON_H */

target/linux/ramips/files/arch/mips/ralink/rt288x/devices.c

@@ -1,7 +1,7 @@
 /*
  *  Ralink RT288x SoC platform device registration
  *
- *  Copyright (C) 2008 Gabor Juhos <[email protected]>
+ *  Copyright (C) 2008-2011 Gabor Juhos <[email protected]>
  *  Copyright (C) 2008 Imre Kaloz <[email protected]>
  *
  *  This program is free software; you can redistribute it and/or modify it
@@ -14,6 +14,8 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/physmap.h>
 #include <linux/etherdevice.h>
+#include <linux/err.h>
+#include <linux/clk.h>
 
 #include <asm/addrspace.h>
 
@@ -154,7 +156,13 @@ static struct platform_device rt288x_eth_device = {
 
 void __init rt288x_register_ethernet(void)
 {
-	rt288x_eth_data.sys_freq = rt288x_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));
+
+	rt288x_eth_data.sys_freq = clk_get_rate(clk);
 	rt288x_eth_data.reset_fe = rt288x_fe_reset;
 	rt288x_eth_data.min_pkt_len = 64;
 

target/linux/ramips/files/arch/mips/ralink/rt288x/rt288x.c

@@ -20,12 +20,6 @@
 #include <asm/mach-ralink/rt288x.h>
 #include <asm/mach-ralink/rt288x_regs.h>
 
-unsigned long rt288x_cpu_freq;
-EXPORT_SYMBOL_GPL(rt288x_cpu_freq);
-
-unsigned long rt288x_sys_freq;
-EXPORT_SYMBOL_GPL(rt288x_sys_freq);
-
 void __iomem * rt288x_sysc_base;
 void __iomem * rt288x_memc_base;
 
@@ -49,31 +43,6 @@ void __init rt288x_detect_sys_type(void)
 		(id & CHIP_ID_REV_MASK));
 }
 
-void __init rt288x_detect_sys_freq(void)
-{
-	u32	t;
-
-	t = rt288x_sysc_rr(SYSC_REG_SYSTEM_CONFIG);
-	t = ((t >> SYSTEM_CONFIG_CPUCLK_SHIFT) & SYSTEM_CONFIG_CPUCLK_MASK);
-
-	switch (t) {
-	case SYSTEM_CONFIG_CPUCLK_250:
-		rt288x_cpu_freq = 250000000;
-		break;
-	case SYSTEM_CONFIG_CPUCLK_266:
-		rt288x_cpu_freq = 266666667;
-		break;
-	case SYSTEM_CONFIG_CPUCLK_280:
-		rt288x_cpu_freq = 280000000;
-		break;
-	case SYSTEM_CONFIG_CPUCLK_300:
-		rt288x_cpu_freq = 300000000;
-		break;
-	}
-
-	rt288x_sys_freq = rt288x_cpu_freq / 2;
-}
-
 static void rt288x_gpio_reserve(int first, int last)
 {
 	for (; first <= last; first++)

target/linux/ramips/files/arch/mips/ralink/rt288x/setup.c

@@ -14,6 +14,8 @@
 #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>
@@ -22,6 +24,7 @@
 #include <asm/mach-ralink/common.h>
 #include <asm/mach-ralink/rt288x.h>
 #include <asm/mach-ralink/rt288x_regs.h>
+#include "common.h"
 
 static void rt288x_restart(char *command)
 {
@@ -44,27 +47,43 @@ unsigned int __cpuinit get_c0_compare_irq(void)
 
 void __init ramips_soc_setup(void)
 {
+	struct clk *clk;
+
 	rt288x_sysc_base = ioremap_nocache(RT2880_SYSC_BASE, RT2880_SYSC_SIZE);
 	rt288x_memc_base = ioremap_nocache(RT2880_MEMC_BASE, RT2880_MEMC_SIZE);
 
 	rt288x_detect_sys_type();
-	rt288x_detect_sys_freq();
+	rt288x_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,
-		rt288x_cpu_freq / 1000000,
-		(rt288x_cpu_freq % 1000000) * 100 / 1000000);
+		clk_get_rate(clk) / 1000000,
+		(clk_get_rate(clk) % 1000000) * 100 / 1000000);
 
 	_machine_restart = rt288x_restart;
 	_machine_halt = rt288x_halt;
 	pm_power_off = rt288x_halt;
 
-	ramips_early_serial_setup(0, RT2880_UART0_BASE, rt288x_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, RT2880_UART0_BASE, clk_get_rate(clk),
 				  RT2880_INTC_IRQ_UART0);
-	ramips_early_serial_setup(1, RT2880_UART1_BASE, rt288x_sys_freq,
+	ramips_early_serial_setup(1, RT2880_UART1_BASE, clk_get_rate(clk),
 				  RT2880_INTC_IRQ_UART1);
 }
 
 void __init plat_time_init(void)
 {
-	mips_hpt_frequency = rt288x_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;
 }