diff options
| author | Wenyou Yang <wenyou.yang@atmel.com> | 2015-10-30 09:47:02 +0800 |
|---|---|---|
| committer | Andreas Bießmann <andreas.devel@googlemail.com> | 2015-11-03 14:21:31 +0100 |
| commit | c19000556e1d21bc5830464b6b9964a977ab1e32 (patch) | |
| tree | b168cb1f34d7a5153a342613c00f62b411c77326 /arch/arm/mach-at91/include/mach | |
| parent | 79667b7b769405ec510baf2afed566eae58ec713 (diff) | |
arm: at91: clock: Add the generated clock support
Some peripherals may need a second clock source that may be different
from the system clock. This second clock is the generated clock (GCK)
and is managed by the PMC via PMC_PCR.
For simplicity, the clock source of the GCK is fixed to PLLA_CLK.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>
Diffstat (limited to 'arch/arm/mach-at91/include/mach')
| -rw-r--r-- | arch/arm/mach-at91/include/mach/at91_pmc.h | 13 | ||||
| -rw-r--r-- | arch/arm/mach-at91/include/mach/clk.h | 10 |
2 files changed, 23 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/include/mach/at91_pmc.h b/arch/arm/mach-at91/include/mach/at91_pmc.h index 8a3fb942f7..5a51be6288 100644 --- a/arch/arm/mach-at91/include/mach/at91_pmc.h +++ b/arch/arm/mach-at91/include/mach/at91_pmc.h @@ -153,8 +153,20 @@ typedef struct at91_pmc { #define AT91_PMC_IXR_MOSCSELS 0x00010000 #define AT91_PMC_PCR_PID_MASK (0x3f) +#define AT91_PMC_PCR_GCKCSS (0x7 << 8) +#define AT91_PMC_PCR_GCKCSS_SLOW_CLK (0x0 << 8) +#define AT91_PMC_PCR_GCKCSS_MAIN_CLK (0x1 << 8) +#define AT91_PMC_PCR_GCKCSS_PLLA_CLK (0x2 << 8) +#define AT91_PMC_PCR_GCKCSS_UPLL_CLK (0x3 << 8) +#define AT91_PMC_PCR_GCKCSS_MCK_CLK (0x4 << 8) +#define AT91_PMC_PCR_GCKCSS_AUDIO_CLK (0x5 << 8) #define AT91_PMC_PCR_CMD_WRITE (0x1 << 12) +#define AT91_PMC_PCR_DIV (0x3 << 16) +#define AT91_PMC_PCR_GCKDIV (0xff << 20) +#define AT91_PMC_PCR_GCKDIV_(x) ((x & 0xff) << 20) +#define AT91_PMC_PCR_GCKDIV_OFFSET 20 #define AT91_PMC_PCR_EN (0x1 << 28) +#define AT91_PMC_PCR_GCKEN (0x1 << 29) #define AT91_PMC_PCK (1 << 0) /* Processor Clock */ #define AT91RM9200_PMC_UDP (1 << 1) /* USB Devcice Port Clock [AT91RM9200 only] */ @@ -236,6 +248,7 @@ typedef struct at91_pmc { #define AT91_PMC_PCK1RDY (1 << 9) /* Programmable Clock 1 */ #define AT91_PMC_PCK2RDY (1 << 10) /* Programmable Clock 2 */ #define AT91_PMC_PCK3RDY (1 << 11) /* Programmable Clock 3 */ +#define AT91_PMC_GCKRDY (1 << 24) #define AT91_PMC_PROTKEY 0x504d4301 /* Activation Code */ #endif diff --git a/arch/arm/mach-at91/include/mach/clk.h b/arch/arm/mach-at91/include/mach/clk.h index 1d45e2dc11..ad839275ec 100644 --- a/arch/arm/mach-at91/include/mach/clk.h +++ b/arch/arm/mach-at91/include/mach/clk.h @@ -13,6 +13,13 @@ #include <asm/arch/at91_pmc.h> #include <asm/global_data.h> +#define GCK_CSS_SLOW_CLK 0 +#define GCK_CSS_MAIN_CLK 1 +#define GCK_CSS_PLLA_CLK 2 +#define GCK_CSS_UPLL_CLK 3 +#define GCK_CSS_MCK_CLK 4 +#define GCK_CSS_AUDIO_CLK 5 + static inline unsigned long get_cpu_clk_rate(void) { DECLARE_GLOBAL_DATA_PTR; @@ -119,4 +126,7 @@ static inline unsigned long get_pit_clk_rate(void) int at91_clock_init(unsigned long main_clock); void at91_periph_clk_enable(int id); void at91_periph_clk_disable(int id); +int at91_enable_periph_generated_clk(u32 id, u32 clk_source, u32 div); +u32 at91_get_periph_generated_clk(u32 id); + #endif /* __ASM_ARM_ARCH_CLK_H__ */ |