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ARM: at91: clock: add UTMI PLL enable/disable function 

To avoid the duplicated code, add the UTMI PLL handle functions,
and add PMC_USB init function too.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Tested-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>
This commit is contained in:
Wenyou Yang 2016-02-02 11:11:51 +08:00 committed by Andreas Bießmann
parent cd4de1d928
commit 1e70b37346
2 changed files with 51 additions and 0 deletions
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48
arch/arm/mach-at91/clock.c
View File

@ -10,6 +10,8 @@
#include <asm/arch/hardware.h>
#include <asm/arch/at91_pmc.h>
#define EN_UPLL_TIMEOUT 500
void at91_periph_clk_enable(int id)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
@ -64,3 +66,49 @@ void at91_system_clk_disable(int sys_clk)
writel(sys_clk, &pmc->scdr);
}
int at91_upll_clk_enable(void)
{
struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
ulong start_time, tmp_time;
if ((readl(&pmc->uckr) & AT91_PMC_UPLLEN) == AT91_PMC_UPLLEN)
return 0;
start_time = get_timer(0);
writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr);
while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) {
tmp_time = get_timer(0);
if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
printf("ERROR: failed to enable UPLL\n");
return -1;
}
}
return 0;
}
int at91_upll_clk_disable(void)
{
struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
ulong start_time, tmp_time;
start_time = get_timer(0);
writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr);
while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) {
tmp_time = get_timer(0);
if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
printf("ERROR: failed to stop UPLL\n");
return -1;
}
}
return 0;
}
void at91_usb_clk_init(u32 value)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
writel(value, &pmc->usb);
}

3
arch/arm/mach-at91/include/mach/clk.h
View File

@ -130,5 +130,8 @@ int at91_enable_periph_generated_clk(u32 id, u32 clk_source, u32 div);
u32 at91_get_periph_generated_clk(u32 id);
void at91_system_clk_enable(int sys_clk);
void at91_system_clk_disable(int sys_clk);
int at91_upll_clk_enable(void);
int at91_upll_clk_disable(void);
void at91_usb_clk_init(u32 value);
#endif /* __ASM_ARM_ARCH_CLK_H__ */