mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-12 07:57:21 +00:00
81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2013 Atmel Corporation
|
||
|
|
* Bo Shen <voice.shen@atmel.com>
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: GPL-2.0+
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <common.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <asm/arch/at91_common.h>
|
||
|
|
#include <asm/arch/at91_pit.h>
|
||
|
|
#include <asm/arch/at91_pmc.h>
|
||
|
|
#include <asm/arch/at91_rstc.h>
|
||
|
|
#include <asm/arch/at91_wdt.h>
|
||
|
|
#include <asm/arch/clk.h>
|
||
|
|
#include <spl.h>
|
||
|
|
|
||
|
|
DECLARE_GLOBAL_DATA_PTR;
|
||
|
|
|
||
|
|
static void switch_to_main_crystal_osc(void)
|
||
|
|
{
|
||
|
|
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
|
||
|
|
u32 tmp;
|
||
|
|
|
||
|
|
tmp = readl(&pmc->mor);
|
||
|
|
tmp &= ~AT91_PMC_MOR_OSCOUNT(0xff);
|
||
|
|
tmp &= ~AT91_PMC_MOR_KEY(0xff);
|
||
|
|
tmp |= AT91_PMC_MOR_MOSCEN;
|
||
|
|
tmp |= AT91_PMC_MOR_OSCOUNT(8);
|
||
|
|
tmp |= AT91_PMC_MOR_KEY(0x37);
|
||
|
|
writel(tmp, &pmc->mor);
|
||
|
|
while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCS))
|
||
|
|
;
|
||
|
|
|
||
|
|
tmp = readl(&pmc->mor);
|
||
|
|
tmp &= ~AT91_PMC_MOR_OSCBYPASS;
|
||
|
|
tmp &= ~AT91_PMC_MOR_KEY(0xff);
|
||
|
|
tmp |= AT91_PMC_MOR_KEY(0x37);
|
||
|
|
writel(tmp, &pmc->mor);
|
||
|
|
|
||
|
|
tmp = readl(&pmc->mor);
|
||
|
|
tmp |= AT91_PMC_MOR_MOSCSEL;
|
||
|
|
tmp &= ~AT91_PMC_MOR_KEY(0xff);
|
||
|
|
tmp |= AT91_PMC_MOR_KEY(0x37);
|
||
|
|
writel(tmp, &pmc->mor);
|
||
|
|
|
||
|
|
while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
|
||
|
|
;
|
||
|
|
|
||
|
|
/* Wait until MAINRDY field is set to make sure main clock is stable */
|
||
|
|
while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
|
||
|
|
;
|
||
|
|
|
||
|
|
tmp = readl(&pmc->mor);
|
||
|
|
tmp &= ~AT91_PMC_MOR_MOSCRCEN;
|
||
|
|
tmp &= ~AT91_PMC_MOR_KEY(0xff);
|
||
|
|
tmp |= AT91_PMC_MOR_KEY(0x37);
|
||
|
|
writel(tmp, &pmc->mor);
|
||
|
|
}
|
||
|
|
|
||
|
|
void s_init(void)
|
||
|
|
{
|
||
|
|
switch_to_main_crystal_osc();
|
||
|
|
|
||
|
|
/* disable watchdog */
|
||
|
|
at91_disable_wdt();
|
||
|
|
|
||
|
|
/* PMC configuration */
|
||
|
|
at91_pmc_init();
|
||
|
|
|
||
|
|
at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
|
||
|
|
|
||
|
|
timer_init();
|
||
|
|
|
||
|
|
board_early_init_f();
|
||
|
|
|
||
|
|
preloader_console_init();
|
||
|
|
|
||
|
|
mem_init();
|
||
|
|
}
|