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author | Tom Rini <trini@konsulko.com> | 2016-02-20 17:32:48 -0500 |
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committer | Tom Rini <trini@konsulko.com> | 2016-02-20 17:32:48 -0500 |
commit | 20680b560a17fb29c862de77930cfbf76b24f83c (patch) | |
tree | f66975032b21063ad86fd01553983b3c79b398cf /arch/arm/mach-at91/clock.c | |
parent | db6ce2312dcae87619136457d1f9df56789f630a (diff) | |
parent | 2a0b9ea3067b00366455b0504056cb6728a0b865 (diff) | |
download | u-boot-imx-20680b560a17fb29c862de77930cfbf76b24f83c.zip u-boot-imx-20680b560a17fb29c862de77930cfbf76b24f83c.tar.gz u-boot-imx-20680b560a17fb29c862de77930cfbf76b24f83c.tar.bz2 |
Merge branch 'master' of git://git.denx.de/u-boot-atmel
Diffstat (limited to 'arch/arm/mach-at91/clock.c')
-rw-r--r-- | arch/arm/mach-at91/clock.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/clock.c b/arch/arm/mach-at91/clock.c new file mode 100644 index 0000000..06dcbbc --- /dev/null +++ b/arch/arm/mach-at91/clock.c @@ -0,0 +1,121 @@ +/* + * Copyright (C) 2015 Atmel Corporation + * Wenyou Yang <wenyou.yang@atmel.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#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; + +#ifdef CPU_HAS_PCR + u32 regval; + u32 div_value; + + if (id > AT91_PMC_PCR_PID_MASK) + return; + + writel(id, &pmc->pcr); + + div_value = readl(&pmc->pcr) & AT91_PMC_PCR_DIV; + + regval = AT91_PMC_PCR_EN | AT91_PMC_PCR_CMD_WRITE | id | div_value; + + writel(regval, &pmc->pcr); +#else + writel(0x01 << id, &pmc->pcer); +#endif +} + +void at91_periph_clk_disable(int id) +{ + struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; + +#ifdef CPU_HAS_PCR + u32 regval; + + if (id > AT91_PMC_PCR_PID_MASK) + return; + + regval = AT91_PMC_PCR_CMD_WRITE | id; + + writel(regval, &pmc->pcr); +#else + writel(0x01 << id, &pmc->pcdr); +#endif +} + +void at91_system_clk_enable(int sys_clk) +{ + struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; + + writel(sys_clk, &pmc->scer); +} + +void at91_system_clk_disable(int sys_clk) +{ + struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; + + 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); +} + +void at91_pllicpr_init(u32 icpr) +{ + struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC; + + writel(icpr, &pmc->pllicpr); +} |