summaryrefslogtreecommitdiff
path: root/arch/arm/cpu/at91-common/spl_at91.c
diff options
context:
space:
mode:
authorHeiko Schocher <hs@denx.de>2014-10-31 08:31:04 +0100
committerTom Rini <trini@ti.com>2014-11-17 08:47:17 -0500
commit5abc00d02082056765a8029675e7b05ab6c35263 (patch)
tree381ca30258c8bcc82372e99ba2f903b9a74492c7 /arch/arm/cpu/at91-common/spl_at91.c
parent667af36905157b65fd79493e7f821db606ebbd33 (diff)
downloadu-boot-imx-5abc00d02082056765a8029675e7b05ab6c35263.zip
u-boot-imx-5abc00d02082056765a8029675e7b05ab6c35263.tar.gz
u-boot-imx-5abc00d02082056765a8029675e7b05ab6c35263.tar.bz2
arm, spl, at91: add at91sam9260 and at91sam9g45 spl support
add support for using spl code on at91sam9260 and at91sam9g45 based boards. Signed-off-by: Heiko Schocher <hs@denx.de> Reviewed-by: Bo Shen <voice.shen@atmel.com> Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com> [adopt Bo's change in spl.c] Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
Diffstat (limited to 'arch/arm/cpu/at91-common/spl_at91.c')
-rw-r--r--arch/arm/cpu/at91-common/spl_at91.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/arm/cpu/at91-common/spl_at91.c b/arch/arm/cpu/at91-common/spl_at91.c
new file mode 100644
index 0000000..89f588b
--- /dev/null
+++ b/arch/arm/cpu/at91-common/spl_at91.c
@@ -0,0 +1,124 @@
+/*
+ * (C) Copyright 2014 DENX Software Engineering
+ * Heiko Schocher <hs@denx.de>
+ *
+ * Based on:
+ * 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/at91sam9_matrix.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 enable_ext_reset(void)
+{
+ struct at91_rstc *rstc = (struct at91_rstc *)ATMEL_BASE_RSTC;
+
+ writel(AT91_RSTC_KEY | AT91_RSTC_MR_URSTEN, &rstc->mr);
+}
+
+void lowlevel_clock_init(void)
+{
+ struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
+
+ if (!(readl(&pmc->sr) & AT91_PMC_MOSCS)) {
+ /* Enable Main Oscillator */
+ writel(AT91_PMC_MOSCS | (0x40 << 8), &pmc->mor);
+
+ /* Wait until Main Oscillator is stable */
+ while (!(readl(&pmc->sr) & AT91_PMC_MOSCS))
+ ;
+ }
+
+ /* After stabilization, switch to Main Oscillator */
+ if ((readl(&pmc->mckr) & AT91_PMC_CSS) == AT91_PMC_CSS_SLOW) {
+ unsigned long tmp;
+
+ tmp = readl(&pmc->mckr);
+ tmp &= ~AT91_PMC_CSS;
+ tmp |= AT91_PMC_CSS_MAIN;
+ writel(tmp, &pmc->mckr);
+ while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
+ ;
+
+ tmp &= ~AT91_PMC_PRES;
+ tmp |= AT91_PMC_PRES_1;
+ writel(tmp, &pmc->mckr);
+ while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
+ ;
+ }
+
+ return;
+}
+
+void __weak matrix_init(void)
+{
+}
+
+void __weak at91_spl_board_init(void)
+{
+}
+
+void spl_board_init(void)
+{
+ struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
+
+ lowlevel_clock_init();
+ at91_disable_wdt();
+
+ /*
+ * At this stage the main oscillator is supposed to be enabled
+ * PCK = MCK = MOSC
+ */
+ writel(0x00, &pmc->pllicpr);
+
+ /* Configure PLLA = MOSC * (PLL_MULA + 1) / PLL_DIVA */
+ at91_plla_init(CONFIG_SYS_AT91_PLLA);
+
+ /* PCK = PLLA = 2 * MCK */
+ at91_mck_init(CONFIG_SYS_MCKR);
+
+ /* Switch MCK on PLLA output */
+ at91_mck_init(CONFIG_SYS_MCKR_CSS);
+
+#if defined(CONFIG_SYS_AT91_PLLB)
+ /* Configure PLLB */
+ at91_pllb_init(CONFIG_SYS_AT91_PLLB);
+#endif
+
+ /* Enable External Reset */
+ enable_ext_reset();
+
+ /* Initialize matrix */
+ matrix_init();
+
+ gd->arch.mck_rate_hz = CONFIG_SYS_MASTER_CLOCK;
+ /*
+ * init timer long enough for using in spl.
+ */
+ timer_init();
+
+ /* enable clocks for all PIOs */
+ at91_periph_clk_enable(ATMEL_ID_PIOA);
+ at91_periph_clk_enable(ATMEL_ID_PIOB);
+ at91_periph_clk_enable(ATMEL_ID_PIOC);
+ /* init console */
+ at91_seriald_hw_init();
+ preloader_console_init();
+
+ mem_init();
+
+ at91_spl_board_init();
+}