diff options
Diffstat (limited to 'arch/arm/mach-s3c2410/clock.c')
| -rw-r--r-- | arch/arm/mach-s3c2410/clock.c | 178 |
1 files changed, 174 insertions, 4 deletions
diff --git a/arch/arm/mach-s3c2410/clock.c b/arch/arm/mach-s3c2410/clock.c index 08489efdaf06..fec02c92f95f 100644 --- a/arch/arm/mach-s3c2410/clock.c +++ b/arch/arm/mach-s3c2410/clock.c @@ -38,12 +38,14 @@ #include <linux/ioport.h> #include <linux/clk.h> #include <linux/mutex.h> +#include <linux/delay.h> #include <asm/hardware.h> #include <asm/irq.h> #include <asm/io.h> #include <asm/arch/regs-clock.h> +#include <asm/arch/regs-gpio.h> #include "clock.h" #include "cpu.h" @@ -51,7 +53,8 @@ /* clock information */ static LIST_HEAD(clocks); -static DEFINE_MUTEX(clocks_mutex); + +DEFINE_MUTEX(clocks_mutex); /* old functions */ @@ -178,12 +181,24 @@ unsigned long clk_get_rate(struct clk *clk) long clk_round_rate(struct clk *clk, unsigned long rate) { + if (!IS_ERR(clk) && clk->round_rate) + return (clk->round_rate)(clk, rate); + return rate; } int clk_set_rate(struct clk *clk, unsigned long rate) { - return -EINVAL; + int ret; + + if (IS_ERR(clk)) + return -EINVAL; + + mutex_lock(&clocks_mutex); + ret = (clk->set_rate)(clk, rate); + mutex_unlock(&clocks_mutex); + + return ret; } struct clk *clk_get_parent(struct clk *clk) @@ -191,6 +206,23 @@ struct clk *clk_get_parent(struct clk *clk) return clk->parent; } +int clk_set_parent(struct clk *clk, struct clk *parent) +{ + int ret = 0; + + if (IS_ERR(clk)) + return -EINVAL; + + mutex_lock(&clocks_mutex); + + if (clk->set_parent) + ret = (clk->set_parent)(clk, parent); + + mutex_unlock(&clocks_mutex); + + return ret; +} + EXPORT_SYMBOL(clk_get); EXPORT_SYMBOL(clk_put); EXPORT_SYMBOL(clk_enable); @@ -199,6 +231,29 @@ EXPORT_SYMBOL(clk_get_rate); EXPORT_SYMBOL(clk_round_rate); EXPORT_SYMBOL(clk_set_rate); EXPORT_SYMBOL(clk_get_parent); +EXPORT_SYMBOL(clk_set_parent); + +/* base clock enable */ + +static int s3c24xx_upll_enable(struct clk *clk, int enable) +{ + unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW); + unsigned long orig = clkslow; + + if (enable) + clkslow &= ~S3C2410_CLKSLOW_UCLK_OFF; + else + clkslow |= S3C2410_CLKSLOW_UCLK_OFF; + + __raw_writel(clkslow, S3C2410_CLKSLOW); + + /* if we started the UPLL, then allow to settle */ + + if (enable && !(orig & S3C2410_CLKSLOW_UCLK_OFF)) + udelay(200); + + return 0; +} /* base clocks */ @@ -210,6 +265,14 @@ static struct clk clk_xtal = { .ctrlbit = 0, }; +static struct clk clk_upll = { + .name = "upll", + .id = -1, + .parent = NULL, + .enable = s3c24xx_upll_enable, + .ctrlbit = 0, +}; + static struct clk clk_f = { .name = "fclk", .id = -1, @@ -234,26 +297,124 @@ static struct clk clk_p = { .ctrlbit = 0, }; +struct clk clk_usb_bus = { + .name = "usb-bus", + .id = -1, + .rate = 0, + .parent = &clk_upll, +}; + /* clocks that could be registered by external code */ +static int s3c24xx_dclk_enable(struct clk *clk, int enable) +{ + unsigned long dclkcon = __raw_readl(S3C2410_DCLKCON); + + if (enable) + dclkcon |= clk->ctrlbit; + else + dclkcon &= ~clk->ctrlbit; + + __raw_writel(dclkcon, S3C2410_DCLKCON); + + return 0; +} + +static int s3c24xx_dclk_setparent(struct clk *clk, struct clk *parent) +{ + unsigned long dclkcon; + unsigned int uclk; + + if (parent == &clk_upll) + uclk = 1; + else if (parent == &clk_p) + uclk = 0; + else + return -EINVAL; + + clk->parent = parent; + + dclkcon = __raw_readl(S3C2410_DCLKCON); + + if (clk->ctrlbit == S3C2410_DCLKCON_DCLK0EN) { + if (uclk) + dclkcon |= S3C2410_DCLKCON_DCLK0_UCLK; + else + dclkcon &= ~S3C2410_DCLKCON_DCLK0_UCLK; + } else { + if (uclk) + dclkcon |= S3C2410_DCLKCON_DCLK1_UCLK; + else + dclkcon &= ~S3C2410_DCLKCON_DCLK1_UCLK; + } + + __raw_writel(dclkcon, S3C2410_DCLKCON); + + return 0; +} + + +static int s3c24xx_clkout_setparent(struct clk *clk, struct clk *parent) +{ + unsigned long mask; + unsigned long source; + + /* calculate the MISCCR setting for the clock */ + + if (parent == &clk_xtal) + source = S3C2410_MISCCR_CLK0_MPLL; + else if (parent == &clk_upll) + source = S3C2410_MISCCR_CLK0_UPLL; + else if (parent == &clk_f) + source = S3C2410_MISCCR_CLK0_FCLK; + else if (parent == &clk_p) + source = S3C2410_MISCCR_CLK0_PCLK; + else if (clk == &s3c24xx_clkout0 && parent == &s3c24xx_dclk0) + source = S3C2410_MISCCR_CLK0_DCLK0; + else if (clk == &s3c24xx_clkout1 && parent == &s3c24xx_dclk1) + source = S3C2410_MISCCR_CLK0_DCLK0; + else + return -EINVAL; + + if (clk == &s3c24xx_dclk0) + mask = S3C2410_MISCCR_CLK0_MASK; + else { + source <<= 4; + mask = S3C2410_MISCCR_CLK1_MASK; + } + + s3c2410_modify_misccr(mask, source); + return 0; +} + +/* external clock definitions */ + struct clk s3c24xx_dclk0 = { .name = "dclk0", .id = -1, + .ctrlbit = S3C2410_DCLKCON_DCLK0EN, + .enable = s3c24xx_dclk_enable, + .set_parent = s3c24xx_dclk_setparent, }; struct clk s3c24xx_dclk1 = { .name = "dclk1", .id = -1, + .ctrlbit = S3C2410_DCLKCON_DCLK0EN, + .enable = s3c24xx_dclk_enable, + .set_parent = s3c24xx_dclk_setparent, }; struct clk s3c24xx_clkout0 = { .name = "clkout0", .id = -1, + .set_parent = s3c24xx_clkout_setparent, }; struct clk s3c24xx_clkout1 = { .name = "clkout1", .id = -1, + .set_parent = s3c24xx_clkout_setparent, }; struct clk s3c24xx_uclk = { @@ -262,7 +423,7 @@ struct clk s3c24xx_uclk = { }; -/* clock definitions */ +/* standard clock definitions */ static struct clk init_clocks[] = { { @@ -374,7 +535,7 @@ int s3c24xx_register_clock(struct clk *clk) /* if this is a standard clock, set the usage state */ - if (clk->ctrlbit) { + if (clk->ctrlbit && clk->enable == s3c24xx_clkcon_enable) { unsigned long clkcon = __raw_readl(S3C2410_CLKCON); clk->usage = (clkcon & clk->ctrlbit) ? 1 : 0; @@ -396,6 +557,7 @@ int __init s3c24xx_setup_clocks(unsigned long xtal, unsigned long hclk, unsigned long pclk) { + unsigned long upllcon = __raw_readl(S3C2410_UPLLCON); unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW); struct clk *clkp = init_clocks; int ptr; @@ -406,6 +568,7 @@ int __init s3c24xx_setup_clocks(unsigned long xtal, /* initialise the main system clocks */ clk_xtal.rate = xtal; + clk_upll.rate = s3c2410_get_pll(upllcon, xtal); clk_h.rate = hclk; clk_p.rate = pclk; @@ -439,6 +602,9 @@ int __init s3c24xx_setup_clocks(unsigned long xtal, if (s3c24xx_register_clock(&clk_xtal) < 0) printk(KERN_ERR "failed to register master xtal\n"); + if (s3c24xx_register_clock(&clk_upll) < 0) + printk(KERN_ERR "failed to register upll clock\n"); + if (s3c24xx_register_clock(&clk_f) < 0) printk(KERN_ERR "failed to register cpu fclk\n"); @@ -448,6 +614,10 @@ int __init s3c24xx_setup_clocks(unsigned long xtal, if (s3c24xx_register_clock(&clk_p) < 0) printk(KERN_ERR "failed to register cpu pclk\n"); + + if (s3c24xx_register_clock(&clk_usb_bus) < 0) + printk(KERN_ERR "failed to register usb bus clock\n"); + /* register clocks from clock array */ for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) { |