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ARM: atmel: use pcr to enable or disable peripheral clock 

When use pcr (peripheral control register), then we won't need
to care about the peripheral ID.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
This commit is contained in:
Bo Shen 2014-08-06 17:24:54 +08:00 committed by Andreas Bießmann
parent 7b1dc26fae
commit b24c1a10b5
3 changed files with 25 additions and 4 deletions
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24
arch/arm/cpu/armv7/at91/clock.c
View File

@ -114,9 +114,25 @@ int at91_clock_init(unsigned long main_clock)
void at91_periph_clk_enable(int id)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
u32 regval;
if (id > 31)
writel(1 << (id - 32), &pmc->pcer1);
else
writel(1 << id, &pmc->pcer);
if (id > AT91_PMC_PCR_PID_MASK)
return;
regval = AT91_PMC_PCR_EN | AT91_PMC_PCR_CMD_WRITE | id;
writel(regval, &pmc->pcr);
}
void at91_periph_clk_disable(int id)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
u32 regval;
if (id > AT91_PMC_PCR_PID_MASK)
return;
regval = AT91_PMC_PCR_CMD_WRITE | id;
writel(regval, &pmc->pcr);
}

4
arch/arm/include/asm/arch-at91/at91_pmc.h
View File

@ -147,6 +147,10 @@ typedef struct at91_pmc {
#define AT91_PMC_IXR_PCKRDY3 0x00000800
#define AT91_PMC_IXR_MOSCSELS 0x00010000
#define AT91_PMC_PCR_PID_MASK (0x3f)
#define AT91_PMC_PCR_CMD_WRITE (0x1 << 12)
#define AT91_PMC_PCR_EN (0x1 << 28)
#define AT91_PMC_PCK (1 << 0) /* Processor Clock */
#define AT91RM9200_PMC_UDP (1 << 1) /* USB Devcice Port Clock [AT91RM9200 only] */
#define AT91RM9200_PMC_MCKUDP (1 << 2) /* USB Device Port Master Clock Automatic Disable on Suspend [AT91RM9200 only] */

1
arch/arm/include/asm/arch-at91/clk.h
View File

@ -80,4 +80,5 @@ static inline unsigned long get_mci_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);
#endif /* __ASM_ARM_ARCH_CLK_H__ */