snowball: Adding architecture dependent initialisation

Enabling timers and clocks in PRCMU and cleaning up mailbox.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: John Rigby <john.rigby@linaro.org>

3 files changed, 72 insertions, 1 deletions

diff --git a/arch/arm/cpu/armv7/u8500/Makefile b/arch/arm/cpu/armv7/u8500/Makefile
index 77accde9c5..ce8af96038 100644
--- a/arch/arm/cpu/armv7/u8500/Makefile
+++ b/arch/arm/cpu/armv7/u8500/Makefile
@@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(SOC).o
 
-COBJS	= timer.o clock.o prcmu.o
+COBJS	= timer.o clock.o prcmu.o cpu.o
 SOBJS	= lowlevel.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/arch/arm/cpu/armv7/u8500/cpu.c b/arch/arm/cpu/armv7/u8500/cpu.c
new file mode 100644
index 0000000000..04f4b1928c
--- /dev/null
+++ b/arch/arm/cpu/armv7/u8500/cpu.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2012 Linaro Limited
+ * Mathieu Poirier <mathieu.poirier@linaro.org>
+ *
+ * Based on original code from Joakim Axelsson at ST-Ericsson
+ * (C) Copyright 2010 ST-Ericsson
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/prcmu.h>
+
+#ifdef CONFIG_ARCH_CPU_INIT
+/*
+ * SOC specific cpu init
+ */
+int arch_cpu_init(void)
+{
+	db8500_prcmu_init();
+
+	return 0;
+}
+#endif /* CONFIG_ARCH_CPU_INIT */
diff --git a/arch/arm/cpu/armv7/u8500/prcmu.c b/arch/arm/cpu/armv7/u8500/prcmu.c
index b256d27b84..4918bbc1ca 100644
--- a/arch/arm/cpu/armv7/u8500/prcmu.c
+++ b/arch/arm/cpu/armv7/u8500/prcmu.c
@@ -40,6 +40,8 @@
 #define PRCM_MBOX_CPU_SET (U8500_PRCMU_BASE + 0x100)
 #define PRCM_MBOX_CPU_CLR (U8500_PRCMU_BASE + 0x104)
 
+#define I2C_MBOX_BIT    (1 << 5)
+
 static int prcmu_is_ready(void)
 {
 	int ready = readb(PRCM_XP70_CUR_PWR_STATE) == AP_EXECUTE;
@@ -162,3 +164,31 @@ int prcmu_i2c_write(u8 reg, u16 slave, u8 reg_data)
 		return -1;
 	}
 }
+
+void u8500_prcmu_enable(u32 *reg)
+{
+	writel(readl(reg) | (1 << 8), reg);
+}
+
+void db8500_prcmu_init(void)
+{
+	/* Enable timers */
+	writel(1 << 17, PRCM_TCR);
+
+	u8500_prcmu_enable((u32 *)PRCM_PER1CLK_MGT_REG);
+	u8500_prcmu_enable((u32 *)PRCM_PER2CLK_MGT_REG);
+	u8500_prcmu_enable((u32 *)PRCM_PER3CLK_MGT_REG);
+	/* PER4CLK does not exist */
+	u8500_prcmu_enable((u32 *)PRCM_PER5CLK_MGT_REG);
+	u8500_prcmu_enable((u32 *)PRCM_PER6CLK_MGT_REG);
+	/* Only exists in ED but is always ok to write to */
+	u8500_prcmu_enable((u32 *)PRCM_PER7CLK_MGT_REG);
+
+	u8500_prcmu_enable((u32 *)PRCM_UARTCLK_MGT_REG);
+	u8500_prcmu_enable((u32 *)PRCM_I2CCLK_MGT_REG);
+
+	u8500_prcmu_enable((u32 *)PRCM_SDMMCCLK_MGT_REG);
+
+	/* Clean up the mailbox interrupts after pre-u-boot code. */
+	writel(I2C_MBOX_BIT, PRCM_ARM_IT1_CLEAR);
+}