ARM: clps711x: Add generic board support (CLEP7212)

This patch adds generic board support (CLEP7212, Linux ARM ID=91)
for CLPS711X-target.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 56 insertions, 0 deletions

diff --git a/arch/arm/boards/clep7212/lowlevel.c b/arch/arm/boards/clep7212/lowlevel.c
new file mode 100644
index 0000000000..9b7e2410f3
--- /dev/null
+++ b/arch/arm/boards/clep7212/lowlevel.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <common.h>
+#include <init.h>
+
+#include <asm/io.h>
+#include <asm/barebox-arm.h>
+#include <asm/barebox-arm-head.h>
+
+#include <mach/clps711x.h>
+
+#define MAIN_CLOCK		3686400
+#define CPU_SPEED		92160000
+#define BUS_SPEED		(CPU_SPEED / 2)
+
+#define PLL_VALUE		(((CPU_SPEED * 2) / MAIN_CLOCK) << 24)
+#define SDRAM_REFRESH_RATE	(64 * (BUS_SPEED / (8192 * 1000)))
+
+void __naked __bare_init reset(void)
+{
+	u32 tmp;
+
+	common_reset();
+
+	/* Setup base clock */
+	writel(SYSCON3_CLKCTL0 | SYSCON3_CLKCTL1, SYSCON3);
+	asm("nop");
+
+	/* Setup PLL */
+	writel(PLL_VALUE, PLLW);
+	asm("nop");
+
+	/* CLKEN select, SDRAM width=32 */
+	writel(SYSCON2_CLKENSL, SYSCON2);
+
+	/* Enable SDQM pins */
+	tmp = readl(SYSCON3);
+	tmp &= ~SYSCON3_ENPD67;
+	writel(tmp, SYSCON3);
+
+	/* Setup Refresh Rate (64ms 8K Blocks) */
+	writel(SDRAM_REFRESH_RATE, SDRFPR);
+
+	/* Setup SDRAM (32MB, 16Bit*2, CAS=3) */
+	writel(SDCONF_CASLAT_3 | SDCONF_SIZE_256 | SDCONF_WIDTH_16 |
+	       SDCONF_CLKCTL | SDCONF_ACTIVE, SDCONF);
+
+	board_init_lowlevel_return();
+}