mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-10 13:16:16 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
133 lines
2.7 KiB
C
133 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2014 DENX Software Engineering
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* Heiko Schocher <hs@denx.de>
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*
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* Based on:
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* Copyright (C) 2013 Atmel Corporation
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* Bo Shen <voice.shen@atmel.com>
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/at91_common.h>
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#include <asm/arch/at91sam9_matrix.h>
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#include <asm/arch/at91_pit.h>
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#include <asm/arch/at91_rstc.h>
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#include <asm/arch/at91_wdt.h>
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#include <asm/arch/clk.h>
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#include <spl.h>
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DECLARE_GLOBAL_DATA_PTR;
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static void enable_ext_reset(void)
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{
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struct at91_rstc *rstc = (struct at91_rstc *)ATMEL_BASE_RSTC;
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writel(AT91_RSTC_KEY | AT91_RSTC_MR_URSTEN, &rstc->mr);
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}
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void lowlevel_clock_init(void)
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{
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struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
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if (!(readl(&pmc->sr) & AT91_PMC_MOSCS)) {
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/* Enable Main Oscillator */
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writel(AT91_PMC_MOSCS | (0x40 << 8), &pmc->mor);
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/* Wait until Main Oscillator is stable */
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while (!(readl(&pmc->sr) & AT91_PMC_MOSCS))
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;
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}
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/* After stabilization, switch to Main Oscillator */
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if ((readl(&pmc->mckr) & AT91_PMC_CSS) == AT91_PMC_CSS_SLOW) {
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unsigned long tmp;
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tmp = readl(&pmc->mckr);
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tmp &= ~AT91_PMC_CSS;
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tmp |= AT91_PMC_CSS_MAIN;
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writel(tmp, &pmc->mckr);
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while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
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;
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tmp &= ~AT91_PMC_PRES;
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tmp |= AT91_PMC_PRES_1;
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writel(tmp, &pmc->mckr);
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while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
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;
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}
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return;
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}
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void __weak matrix_init(void)
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{
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}
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void __weak at91_spl_board_init(void)
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{
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}
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void __weak spl_board_init(void)
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{
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}
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void board_init_f(ulong dummy)
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{
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lowlevel_clock_init();
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at91_disable_wdt();
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/*
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* At this stage the main oscillator is supposed to be enabled
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* PCK = MCK = MOSC
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*/
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at91_pllicpr_init(0x00);
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/* Configure PLLA = MOSC * (PLL_MULA + 1) / PLL_DIVA */
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at91_plla_init(CONFIG_SYS_AT91_PLLA);
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/* PCK = PLLA = 2 * MCK */
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at91_mck_init(CONFIG_SYS_MCKR);
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/* Switch MCK on PLLA output */
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at91_mck_init(CONFIG_SYS_MCKR_CSS);
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#if defined(CONFIG_SYS_AT91_PLLB)
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/* Configure PLLB */
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at91_pllb_init(CONFIG_SYS_AT91_PLLB);
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#endif
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/* Enable External Reset */
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enable_ext_reset();
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/* Initialize matrix */
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matrix_init();
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gd->arch.mck_rate_hz = CONFIG_SYS_MASTER_CLOCK;
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/*
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* init timer long enough for using in spl.
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*/
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timer_init();
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/* enable clocks for all PIOs */
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#if defined(CONFIG_AT91SAM9X5) || defined(CONFIG_AT91SAM9N12)
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at91_periph_clk_enable(ATMEL_ID_PIOAB);
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at91_periph_clk_enable(ATMEL_ID_PIOCD);
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#else
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at91_periph_clk_enable(ATMEL_ID_PIOA);
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at91_periph_clk_enable(ATMEL_ID_PIOB);
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at91_periph_clk_enable(ATMEL_ID_PIOC);
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#endif
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#if defined(CONFIG_SPL_SERIAL_SUPPORT)
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/* init console */
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at91_seriald_hw_init();
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preloader_console_init();
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#endif
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mem_init();
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at91_spl_board_init();
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}
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