GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
21813 changed files with 4413081 additions and 0 deletions
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2013 Atmel Corporation
+ *		      Bo Shen <voice.shen@atmel.com>
+ */
+
+#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>
+
+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))
+		;
+
+#if defined(CONFIG_SAMA5D2)
+	/* Enable a measurement of the external oscillator */
+	tmp = readl(&pmc->mcfr);
+	tmp |= AT91_PMC_MCFR_CCSS_XTAL_OSC;
+	tmp |= AT91_PMC_MCFR_RCMEAS;
+	writel(tmp, &pmc->mcfr);
+
+	while (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINRDY))
+		;
+
+	if (!(readl(&pmc->mcfr) & AT91_PMC_MCFR_MAINF_MASK))
+		hang();
+#endif
+
+	tmp = readl(&pmc->mor);
+/*
+ * some boards have an external oscillator with driving.
+ * in this case we need to disable the internal SoC driving (bypass mode)
+ */
+#if defined(CONFIG_SPL_AT91_MCK_BYPASS)
+	tmp |= AT91_PMC_MOR_OSCBYPASS;
+#else
+	tmp &= ~AT91_PMC_MOR_OSCBYPASS;
+#endif
+	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))
+		;
+
+#if !defined(CONFIG_SAMA5D2)
+	/* Wait until MAINRDY field is set to make sure main clock is stable */
+	while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
+		;
+#endif
+
+#if !defined(CONFIG_SAMA5D4) && !defined(CONFIG_SAMA5D2)
+	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);
+#endif
+}
+
+__weak void matrix_init(void)
+{
+	/* This only be used for sama5d4 soc now */
+}
+
+__weak void redirect_int_from_saic_to_aic(void)
+{
+	/* This only be used for sama5d4 soc now */
+}
+
+/* empty stub to satisfy current lowlevel_init, can be removed any time */
+void s_init(void)
+{
+}
+
+void board_init_f(ulong dummy)
+{
+	int ret;
+
+	switch_to_main_crystal_osc();
+
+#ifdef CONFIG_SAMA5D2
+	configure_2nd_sram_as_l2_cache();
+#endif
+
+#if !defined(CONFIG_WDT_AT91)
+	/* disable watchdog */
+	at91_disable_wdt();
+#endif
+
+	/* PMC configuration */
+	at91_pmc_init();
+
+	at91_clock_init(CONFIG_SYS_AT91_MAIN_CLOCK);
+
+	matrix_init();
+
+	redirect_int_from_saic_to_aic();
+
+	timer_init();
+
+	board_early_init_f();
+
+	mem_init();
+
+	ret = spl_init();
+	if (ret) {
+		debug("spl_init() failed: %d\n", ret);
+		hang();
+	}
+
+	preloader_console_init();
+
+}