diff options
Diffstat (limited to 'arch/arm/plat-s3c64xx/clock.c')
| -rw-r--r-- | arch/arm/plat-s3c64xx/clock.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c64xx/clock.c b/arch/arm/plat-s3c64xx/clock.c new file mode 100644 index 000000000000..5a1e97e1f8f6 --- /dev/null +++ b/arch/arm/plat-s3c64xx/clock.c @@ -0,0 +1,282 @@ +/* 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); + } + + s3c_pwmclk_init(); +} |