diff options
Diffstat (limited to 'cpu/arm926ejs/at91/clock.c')
| -rw-r--r-- | cpu/arm926ejs/at91/clock.c | 51 |
1 files changed, 28 insertions, 23 deletions
diff --git a/cpu/arm926ejs/at91/clock.c b/cpu/arm926ejs/at91/clock.c index 574f488..7e03907 100644 --- a/cpu/arm926ejs/at91/clock.c +++ b/cpu/arm926ejs/at91/clock.c @@ -13,9 +13,9 @@ #include <config.h> #include <asm/arch/hardware.h> +#include <asm/arch/io.h> #include <asm/arch/at91_pmc.h> #include <asm/arch/clk.h> -#include <asm/arch/io.h> static unsigned long cpu_clk_rate_hz; static unsigned long main_clk_rate_hz; @@ -57,14 +57,14 @@ u32 get_pllb_init(void) static unsigned long at91_css_to_rate(unsigned long css) { switch (css) { - case AT91_PMC_CSS_SLOW: - return AT91_SLOW_CLOCK; - case AT91_PMC_CSS_MAIN: - return main_clk_rate_hz; - case AT91_PMC_CSS_PLLA: - return plla_rate_hz; - case AT91_PMC_CSS_PLLB: - return pllb_rate_hz; + case AT91_PMC_MCKR_CSS_SLOW: + return AT91_SLOW_CLOCK; + case AT91_PMC_MCKR_CSS_MAIN: + return main_clk_rate_hz; + case AT91_PMC_MCKR_CSS_PLLA: + return plla_rate_hz; + case AT91_PMC_MCKR_CSS_PLLB: + return pllb_rate_hz; } return 0; @@ -146,6 +146,7 @@ static u32 at91_pll_rate(u32 freq, u32 reg) int at91_clock_init(unsigned long main_clock) { unsigned freq, mckr; + at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; #ifndef AT91_MAIN_CLOCK unsigned tmp; /* @@ -164,7 +165,7 @@ int at91_clock_init(unsigned long main_clock) main_clk_rate_hz = main_clock; /* report if PLLA is more than mildly overclocked */ - plla_rate_hz = at91_pll_rate(main_clock, at91_sys_read(AT91_CKGR_PLLAR)); + plla_rate_hz = at91_pll_rate(main_clock, readl(&pmc->pllar)); #ifdef CONFIG_USB_ATMEL /* @@ -174,7 +175,7 @@ int at91_clock_init(unsigned long main_clock) * REVISIT: assumes MCK doesn't derive from PLLB! */ at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2) | - AT91_PMC_USB96M; + AT91_PMC_PLLBR_USBDIV_2; pllb_rate_hz = at91_pll_rate(main_clock, at91_pllb_usb_init); #endif @@ -182,28 +183,32 @@ int at91_clock_init(unsigned long main_clock) * MCK and CPU derive from one of those primary clocks. * For now, assume this parentage won't change. */ - mckr = at91_sys_read(AT91_PMC_MCKR); + mckr = readl(&pmc->mckr); #if defined(CONFIG_AT91SAM9G45) || defined(CONFIG_AT91SAM9M10G45) /* plla divisor by 2 */ plla_rate_hz /= (1 << ((mckr & 1 << 12) >> 12)); #endif - freq = mck_rate_hz = at91_css_to_rate(mckr & AT91_PMC_CSS); + mck_rate_hz = at91_css_to_rate(mckr & AT91_PMC_MCKR_CSS_MASK); + freq = mck_rate_hz; - freq /= (1 << ((mckr & AT91_PMC_PRES) >> 2)); /* prescale */ + freq /= (1 << ((mckr & AT91_PMC_MCKR_PRES_MASK) >> 2)); /* prescale */ #if defined(CONFIG_AT91RM9200) - mck_rate_hz = freq / (1 + ((mckr & AT91_PMC_MDIV) >> 8)); /* mdiv */ + /* mdiv */ + mck_rate_hz = freq / (1 + ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 8)); #elif defined(CONFIG_AT91SAM9G20) - mck_rate_hz = (mckr & AT91_PMC_MDIV) ? - freq / ((mckr & AT91_PMC_MDIV) >> 7) : freq; /* mdiv ; (x >> 7) = ((x >> 8) * 2) */ - if (mckr & AT91_PMC_PDIV) - freq /= 2; /* processor clock division */ + /* mdiv ; (x >> 7) = ((x >> 8) * 2) */ + mck_rate_hz = (mckr & AT91_PMC_MCKR_MDIV_MASK) ? + freq / ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 7) : freq; + if (mckr & AT91_PMC_MCKR_MDIV_MASK) + freq /= 2; /* processor clock division */ #elif defined(CONFIG_AT91SAM9G45) || defined(CONFIG_AT91SAM9M10G45) - mck_rate_hz = (mckr & AT91_PMC_MDIV) == AT91SAM9_PMC_MDIV_3 ? - freq / 3 : freq / (1 << ((mckr & AT91_PMC_MDIV) >> 8)); /* mdiv */ + mck_rate_hz = (mckr & AT91_PMC_MCKR_MDIV_MASK) == AT91SAM9_PMC_MDIV_3 + ? freq / 3 + : freq / (1 << ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 8)); #else - mck_rate_hz = freq / (1 << ((mckr & AT91_PMC_MDIV) >> 8)); /* mdiv */ + mck_rate_hz = freq / (1 << ((mckr & AT91_PMC_MCKR_MDIV_MASK) >> 8)); #endif cpu_clk_rate_hz = freq; - return 0; + return 0; } |