diff options
Diffstat (limited to 'arch/arm/mach-w90x900')
| -rw-r--r-- | arch/arm/mach-w90x900/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/mach-w90x900/clksel.c | 91 | ||||
| -rw-r--r-- | arch/arm/mach-w90x900/cpu.h | 1 | ||||
| -rw-r--r-- | arch/arm/mach-w90x900/include/mach/regs-clock.h | 22 | ||||
| -rw-r--r-- | arch/arm/mach-w90x900/include/mach/regs-ebi.h | 33 | ||||
| -rw-r--r-- | arch/arm/mach-w90x900/w90p910.c | 80 |
6 files changed, 228 insertions, 1 deletions
diff --git a/arch/arm/mach-w90x900/Makefile b/arch/arm/mach-w90x900/Makefile index d50c94f4dbd..3ccd625455c 100644 --- a/arch/arm/mach-w90x900/Makefile +++ b/arch/arm/mach-w90x900/Makefile @@ -5,7 +5,7 @@ # Object file lists. obj-y := irq.o time.o mfp-w90p910.o gpio.o clock.o - +obj-y += clksel.o # W90X900 CPU support files obj-$(CONFIG_CPU_W90P910) += w90p910.o diff --git a/arch/arm/mach-w90x900/clksel.c b/arch/arm/mach-w90x900/clksel.c new file mode 100644 index 00000000000..5a77eb91cb1 --- /dev/null +++ b/arch/arm/mach-w90x900/clksel.c @@ -0,0 +1,91 @@ +/* + * linux/arch/arm/mach-w90x900/clksel.c + * + * Copyright (c) 2008 Nuvoton technology corporation + * + * Wan ZongShun <mcuos.com@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation;version 2 of the License. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/string.h> +#include <linux/clk.h> +#include <linux/mutex.h> +#include <linux/io.h> + +#include <mach/hardware.h> +#include <mach/regs-clock.h> + +#define PLL0 0x00 +#define PLL1 0x01 +#define OTHER 0x02 +#define EXT 0x03 +#define MSOFFSET 0x0C +#define ATAOFFSET 0x0a +#define LCDOFFSET 0x06 +#define AUDOFFSET 0x04 +#define CPUOFFSET 0x00 + +static DEFINE_MUTEX(clksel_sem); + +static void clock_source_select(const char *dev_id, unsigned int clkval) +{ + unsigned int clksel, offset; + + clksel = __raw_readl(REG_CLKSEL); + + if (strcmp(dev_id, "w90p910-ms") == 0) + offset = MSOFFSET; + else if (strcmp(dev_id, "w90p910-atapi") == 0) + offset = ATAOFFSET; + else if (strcmp(dev_id, "w90p910-lcd") == 0) + offset = LCDOFFSET; + else if (strcmp(dev_id, "w90p910-audio") == 0) + offset = AUDOFFSET; + else + offset = CPUOFFSET; + + clksel &= ~(0x03 << offset); + clksel |= (clkval << offset); + + __raw_writel(clksel, REG_CLKSEL); +} + +void w90p910_clock_source(struct device *dev, unsigned char *src) +{ + unsigned int clkval; + const char *dev_id; + + BUG_ON(!src); + clkval = 0; + + mutex_lock(&clksel_sem); + + if (dev) + dev_id = dev_name(dev); + else + dev_id = "cpufreq"; + + if (strcmp(src, "pll0") == 0) + clkval = PLL0; + else if (strcmp(src, "pll1") == 0) + clkval = PLL1; + else if (strcmp(src, "ext") == 0) + clkval = EXT; + else if (strcmp(src, "oth") == 0) + clkval = OTHER; + + clock_source_select(dev_id, clkval); + + mutex_unlock(&clksel_sem); +} +EXPORT_SYMBOL(w90p910_clock_source); + diff --git a/arch/arm/mach-w90x900/cpu.h b/arch/arm/mach-w90x900/cpu.h index 57b5dbabeb4..ddde959d898 100644 --- a/arch/arm/mach-w90x900/cpu.h +++ b/arch/arm/mach-w90x900/cpu.h @@ -45,6 +45,7 @@ extern void w90p910_init_clocks(void); extern void w90p910_map_io(struct map_desc *mach_desc, int size); extern struct platform_device w90p910_serial_device; extern struct sys_timer w90x900_timer; +extern void w90p910_clock_source(struct device *dev, unsigned char *src); #define W90X900_8250PORT(name) \ { \ diff --git a/arch/arm/mach-w90x900/include/mach/regs-clock.h b/arch/arm/mach-w90x900/include/mach/regs-clock.h index f10b6a8dc06..516d6b477b6 100644 --- a/arch/arm/mach-w90x900/include/mach/regs-clock.h +++ b/arch/arm/mach-w90x900/include/mach/regs-clock.h @@ -28,4 +28,26 @@ #define REG_CLKEN1 (CLK_BA + 0x24) #define REG_CLKDIV1 (CLK_BA + 0x28) +/* Define PLL freq setting */ +#define PLL_DISABLE 0x12B63 +#define PLL_66MHZ 0x2B63 +#define PLL_100MHZ 0x4F64 +#define PLL_120MHZ 0x4F63 +#define PLL_166MHZ 0x4124 +#define PLL_200MHZ 0x4F24 + +/* Define AHB:CPUFREQ ratio */ +#define AHB_CPUCLK_1_1 0x00 +#define AHB_CPUCLK_1_2 0x01 +#define AHB_CPUCLK_1_4 0x02 +#define AHB_CPUCLK_1_8 0x03 + +/* Define APB:AHB ratio */ +#define APB_AHB_1_2 0x01 +#define APB_AHB_1_4 0x02 +#define APB_AHB_1_8 0x03 + +/* Define clock skew */ +#define DEFAULTSKEW 0x48 + #endif /* __ASM_ARCH_REGS_CLOCK_H */ diff --git a/arch/arm/mach-w90x900/include/mach/regs-ebi.h b/arch/arm/mach-w90x900/include/mach/regs-ebi.h new file mode 100644 index 00000000000..b68455e7f88 --- /dev/null +++ b/arch/arm/mach-w90x900/include/mach/regs-ebi.h @@ -0,0 +1,33 @@ +/* + * arch/arm/mach-w90x900/include/mach/regs-ebi.h + * + * Copyright (c) 2009 Nuvoton technology corporation. + * + * Wan ZongShun <mcuos.com@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation;version 2 of the License. + * + */ + +#ifndef __ASM_ARCH_REGS_EBI_H +#define __ASM_ARCH_REGS_EBI_H + +/* EBI Control Registers */ + +#define EBI_BA W90X900_VA_EBI +#define REG_EBICON (EBI_BA + 0x00) +#define REG_ROMCON (EBI_BA + 0x04) +#define REG_SDCONF0 (EBI_BA + 0x08) +#define REG_SDCONF1 (EBI_BA + 0x0C) +#define REG_SDTIME0 (EBI_BA + 0x10) +#define REG_SDTIME1 (EBI_BA + 0x14) +#define REG_EXT0CON (EBI_BA + 0x18) +#define REG_EXT1CON (EBI_BA + 0x1C) +#define REG_EXT2CON (EBI_BA + 0x20) +#define REG_EXT3CON (EBI_BA + 0x24) +#define REG_EXT4CON (EBI_BA + 0x28) +#define REG_CKSKEW (EBI_BA + 0x2C) + +#endif /* __ASM_ARCH_REGS_EBI_H */ diff --git a/arch/arm/mach-w90x900/w90p910.c b/arch/arm/mach-w90x900/w90p910.c index 6ebf5cfc78d..8444eababaa 100644 --- a/arch/arm/mach-w90x900/w90p910.c +++ b/arch/arm/mach-w90x900/w90p910.c @@ -24,6 +24,7 @@ #include <linux/platform_device.h> #include <linux/io.h> #include <linux/serial_8250.h> +#include <linux/delay.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> @@ -32,6 +33,8 @@ #include <mach/hardware.h> #include <mach/regs-serial.h> +#include <mach/regs-clock.h> +#include <mach/regs-ebi.h> #include "cpu.h" #include "clock.h" @@ -123,6 +126,83 @@ void __init w90p910_map_io(struct map_desc *mach_desc, int mach_size) printk(KERN_ERR "CPU type 0x%08lx is not W90P910\n", idcode); } +/*Set W90P910 cpu frequence*/ +static int __init w90p910_set_clkval(unsigned int cpufreq) +{ + unsigned int pllclk, ahbclk, apbclk, val; + + pllclk = 0; + ahbclk = 0; + apbclk = 0; + + switch (cpufreq) { + case 66: + pllclk = PLL_66MHZ; + ahbclk = AHB_CPUCLK_1_1; + apbclk = APB_AHB_1_2; + break; + + case 100: + pllclk = PLL_100MHZ; + ahbclk = AHB_CPUCLK_1_1; + apbclk = APB_AHB_1_2; + break; + + case 120: + pllclk = PLL_120MHZ; + ahbclk = AHB_CPUCLK_1_2; + apbclk = APB_AHB_1_2; + break; + + case 166: + pllclk = PLL_166MHZ; + ahbclk = AHB_CPUCLK_1_2; + apbclk = APB_AHB_1_2; + break; + + case 200: + pllclk = PLL_200MHZ; + ahbclk = AHB_CPUCLK_1_2; + apbclk = APB_AHB_1_2; + break; + } + + __raw_writel(pllclk, REG_PLLCON0); + + val = __raw_readl(REG_CLKDIV); + val &= ~(0x03 << 24 | 0x03 << 26); + val |= (ahbclk << 24 | apbclk << 26); + __raw_writel(val, REG_CLKDIV); + + return 0; +} +static int __init w90p910_set_cpufreq(char *str) +{ + unsigned long cpufreq, val; + + if (!*str) + return 0; + + strict_strtoul(str, 0, &cpufreq); + + w90p910_clock_source(NULL, "ext"); + + w90p910_set_clkval(cpufreq); + + mdelay(1); + + val = __raw_readl(REG_CKSKEW); + val &= ~0xff; + val |= DEFAULTSKEW; + __raw_writel(val, REG_CKSKEW); + + w90p910_clock_source(NULL, "pll0"); + + return 1; +} + +__setup("cpufreq=", w90p910_set_cpufreq); + /*Init W90P910 clock*/ void __init w90p910_init_clocks(void) |