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>

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)

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 */

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);
+}

arch/arm/include/asm/arch-u8500/prcmu.h

@@ -27,12 +27,23 @@
 #define I2C_RD_OK	2
 #define I2CWRITE	0
 
-#define _PRCMU_TCDM_BASE    U8500_PRCMU_TCDM_BASE
+#define PRCMU_BASE			U8500_PRCMU_BASE
-#define PRCM_XP70_CUR_PWR_STATE (_PRCMU_TCDM_BASE + 0xFFC)      /* 4 BYTES */
+#define PRCM_UARTCLK_MGT_REG		(PRCMU_BASE + 0x018)
-
+#define PRCM_MSPCLK_MGT_REG		(PRCMU_BASE + 0x01C)
-#define PRCM_REQ_MB5        (_PRCMU_TCDM_BASE + 0xE44)    /* 4 bytes  */
+#define PRCM_I2CCLK_MGT_REG		(PRCMU_BASE + 0x020)
-#define PRCM_ACK_MB5        (_PRCMU_TCDM_BASE + 0xDF4)    /* 4 bytes */
+#define PRCM_SDMMCCLK_MGT_REG		(PRCMU_BASE + 0x024)
+#define PRCM_PER1CLK_MGT_REG		(PRCMU_BASE + 0x02C)
+#define PRCM_PER2CLK_MGT_REG		(PRCMU_BASE + 0x030)
+#define PRCM_PER3CLK_MGT_REG		(PRCMU_BASE + 0x034)
+#define PRCM_PER5CLK_MGT_REG		(PRCMU_BASE + 0x038)
+#define PRCM_PER6CLK_MGT_REG		(PRCMU_BASE + 0x03C)
+#define PRCM_PER7CLK_MGT_REG		(PRCMU_BASE + 0x040)
 
+#define PRCM_ARM_IT1_CLEAR		(PRCMU_BASE + 0x48C)
+#define PRCM_TCR			(PRCMU_BASE + 0x1C8)
+#define PRCM_REQ_MB5			(PRCMU_BASE + 0xE44)
+#define PRCM_ACK_MB5			(PRCMU_BASE + 0xDF4)
+#define PRCM_XP70_CUR_PWR_STATE		(PRCMU_BASE + 0xFFC)
 /* Mailbox 5 Requests */
 #define PRCM_REQ_MB5_I2COPTYPE_REG	(PRCM_REQ_MB5 + 0x0)
 #define PRCM_REQ_MB5_BIT_FIELDS		(PRCM_REQ_MB5 + 0x1)
@@ -52,4 +63,7 @@
 extern int prcmu_i2c_read(u8 reg, u16 slave);
 extern int prcmu_i2c_write(u8 reg, u16 slave, u8 reg_data);
 
+void u8500_prcmu_enable(u32 *reg);
+void db8500_prcmu_init(void);
+
 #endif /* __MACH_PRCMU_FW_V1_H */

board/st-ericsson/u8500/u8500_href.c

@@ -26,8 +26,8 @@
 #include <asm/arch/gpio.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/sys_proto.h>
-#ifdef CONFIG_MMC
 #include <asm/arch/prcmu.h>
+#ifdef CONFIG_MMC
 #include "../../../drivers/mmc/arm_pl180_mmci.h"
 #endif
 
@@ -42,7 +42,6 @@
  * SGA: Smart Graphic accelerator
  * B2R2: Graphic blitter
  */
-#define PRCMU_BASE	CFG_PRCMU_BASE	/* 0x80157000 for U8500 */
 #define PRCM_ARMCLKFIX_MGT_REG		(PRCMU_BASE + 0x000)
 #define PRCM_ACLK_MGT_REG		(PRCMU_BASE + 0x004)
 #define PRCM_SVAMMDSPCLK_MGT_REG	(PRCMU_BASE + 0x008)

include/configs/snowball.h

@@ -31,6 +31,7 @@
 #define CONFIG_SNOWBALL
 #define CONFIG_SYS_ICACHE_OFF
 #define CONFIG_SYS_DCACHE_OFF
+#define CONFIG_ARCH_CPU_INIT
 
 /*
  * High Level Configuration Options