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/* linux/arch/arm/plat-s3c64xx/clock.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C64XX Base clock support
*
* 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/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/map.h>
#include <plat/regs-sys.h>
#include <plat/regs-clock.h>
#include <plat/cpu.h>
#include <plat/devs.h>
#include <plat/clock.h>
struct clk clk_27m = {
.name = "clk_27m",
.id = -1,
.rate = 27000000,
};
static int clk_48m_ctrl(struct clk *clk, int enable)
{
unsigned long flags;
u32 val;
/* can't rely on clock lock, this register has other usages */
local_irq_save(flags);
val = __raw_readl(S3C64XX_OTHERS);
if (enable)
val |= S3C64XX_OTHERS_USBMASK;
else
val &= ~S3C64XX_OTHERS_USBMASK;
__raw_writel(val, S3C64XX_OTHERS);
local_irq_restore(flags);
return 0;
}
struct clk clk_48m = {
.name = "clk_48m",
.id = -1,
.rate = 48000000,
.enable = clk_48m_ctrl,
};
static int inline s3c64xx_gate(void __iomem *reg,
struct clk *clk,
int enable)
{
unsigned int ctrlbit = clk->ctrlbit;
u32 con;
con = __raw_readl(reg);
if (enable)
con |= ctrlbit;
else
con &= ~ctrlbit;
__raw_writel(con, reg);
return 0;
}
static int s3c64xx_pclk_ctrl(struct clk *clk, int enable)
{
return s3c64xx_gate(S3C_PCLK_GATE, clk, enable);
}
static int s3c64xx_hclk_ctrl(struct clk *clk, int enable)
{
return s3c64xx_gate(S3C_HCLK_GATE, clk, enable);
}
int s3c64xx_sclk_ctrl(struct clk *clk, int enable)
{
return s3c64xx_gate(S3C_SCLK_GATE, clk, enable);
}
static struct clk init_clocks_disable[] = {
{
.name = "nand",
.id = -1,
.parent = &clk_h,
}, {
.name = "adc",
.id = -1,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_TSADC,
}, {
.name = "i2c",
.id = -1,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_IIC,
}, {
.name = "iis",
.id = 0,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_IIS0,
}, {
.name = "iis",
.id = 1,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_IIS1,
}, {
.name = "spi",
.id = 0,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_SPI0,
}, {
.name = "spi",
.id = 1,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_SPI1,
}, {
.name = "48m",
.id = 0,
.parent = &clk_48m,
.enable = s3c64xx_sclk_ctrl,
.ctrlbit = S3C_CLKCON_SCLK_MMC0_48,
}, {
.name = "48m",
.id = 1,
.parent = &clk_48m,
.enable = s3c64xx_sclk_ctrl,
.ctrlbit = S3C_CLKCON_SCLK_MMC1_48,
}, {
.name = "48m",
.id = 2,
.parent = &clk_48m,
.enable = s3c64xx_sclk_ctrl,
.ctrlbit = S3C_CLKCON_SCLK_MMC2_48,
},
};
static struct clk init_clocks[] = {
{
.name = "lcd",
.id = -1,
.parent = &clk_h,
.enable = s3c64xx_hclk_ctrl,
.ctrlbit = S3C_CLKCON_HCLK_LCD,
}, {
.name = "gpio",
.id = -1,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_GPIO,
}, {
.name = "usb-host",
.id = -1,
.parent = &clk_h,
.enable = s3c64xx_hclk_ctrl,
.ctrlbit = S3C_CLKCON_SCLK_UHOST,
}, {
.name = "hsmmc",
.id = 0,
.parent = &clk_h,
.enable = s3c64xx_hclk_ctrl,
.ctrlbit = S3C_CLKCON_HCLK_HSMMC0,
}, {
.name = "hsmmc",
.id = 1,
.parent = &clk_h,
.enable = s3c64xx_hclk_ctrl,
.ctrlbit = S3C_CLKCON_HCLK_HSMMC1,
}, {
.name = "hsmmc",
.id = 2,
.parent = &clk_h,
.enable = s3c64xx_hclk_ctrl,
.ctrlbit = S3C_CLKCON_HCLK_HSMMC2,
}, {
.name = "timers",
.id = -1,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_PWM,
}, {
.name = "uart",
.id = 0,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_UART0,
}, {
.name = "uart",
.id = 1,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_UART1,
}, {
.name = "uart",
.id = 2,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_UART2,
}, {
.name = "uart",
.id = 3,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_UART3,
}, {
.name = "rtc",
.id = -1,
.parent = &clk_p,
.enable = s3c64xx_pclk_ctrl,
.ctrlbit = S3C_CLKCON_PCLK_RTC,
}, {
.name = "watchdog",
.id = -1,
.parent = &clk_p,
.ctrlbit = S3C_CLKCON_PCLK_WDT,
}, {
.name = "ac97",
.id = -1,
.parent = &clk_p,
.ctrlbit = S3C_CLKCON_PCLK_AC97,
}
};
static struct clk *clks[] __initdata = {
&clk_ext,
&clk_epll,
&clk_27m,
&clk_48m,
};
void s3c64xx_register_clocks(void)
{
struct clk *clkp;
int ret;
int ptr;
s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));
clkp = init_clocks;
for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
ret = s3c24xx_register_clock(clkp);
if (ret < 0) {
printk(KERN_ERR "Failed to register clock %s (%d)\n",
clkp->name, ret);
}
}
clkp = init_clocks_disable;
for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
ret = s3c24xx_register_clock(clkp);
if (ret < 0) {
printk(KERN_ERR "Failed to register clock %s (%d)\n",
clkp->name, ret);
}
(clkp->enable)(clkp, 0);
}
}
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