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authorMathieu J. Poirier <mathieu.poirier@linaro.org>2012-07-31 08:59:24 +0000
committerJohn Rigby <john.rigby@linaro.org>2012-08-16 08:50:31 -0600
commitea02abc40559b4f7aa512f2a9a6c9bc2d5a684b3 (patch)
tree410eb330791f5dc2d438190b4ca16aaa49140251 /arch/arm
parent9776e50e537cd52c629746488eb5d29111167128 (diff)
downloadu-boot-linaro-stable-ea02abc40559b4f7aa512f2a9a6c9bc2d5a684b3.tar.gz
u8500: Moving prcmu to cpu directory
This is to allow the prcmu functions to be used by multiple u8500-based processors. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: John Rigby <john.rigby@linaro.org>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/cpu/armv7/u8500/Makefile2
-rw-r--r--arch/arm/cpu/armv7/u8500/prcmu.c164
-rw-r--r--arch/arm/include/asm/arch-u8500/prcmu.h55
3 files changed, 220 insertions, 1 deletions
diff --git a/arch/arm/cpu/armv7/u8500/Makefile b/arch/arm/cpu/armv7/u8500/Makefile
index 270aa40c8..77accde9c 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
+COBJS = timer.o clock.o prcmu.o
SOBJS = lowlevel.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/arch/arm/cpu/armv7/u8500/prcmu.c b/arch/arm/cpu/armv7/u8500/prcmu.c
new file mode 100644
index 000000000..b256d27b8
--- /dev/null
+++ b/arch/arm/cpu/armv7/u8500/prcmu.c
@@ -0,0 +1,164 @@
+/*
+ * Copyright (C) 2009 ST-Ericsson SA
+ *
+ * Adapted from the Linux version:
+ * Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
+/*
+ * NOTE: This currently does not support the I2C workaround access method.
+ */
+
+#include <common.h>
+#include <config.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/types.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/prcmu.h>
+
+/* CPU mailbox registers */
+#define PRCM_MBOX_CPU_VAL (U8500_PRCMU_BASE + 0x0fc)
+#define PRCM_MBOX_CPU_SET (U8500_PRCMU_BASE + 0x100)
+#define PRCM_MBOX_CPU_CLR (U8500_PRCMU_BASE + 0x104)
+
+static int prcmu_is_ready(void)
+{
+ int ready = readb(PRCM_XP70_CUR_PWR_STATE) == AP_EXECUTE;
+ if (!ready)
+ printf("PRCMU firmware not ready\n");
+ return ready;
+}
+
+static int _wait_for_req_complete(int num)
+{
+ int timeout = 1000;
+
+ /* checking any already on-going transaction */
+ while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout)
+ timeout--;
+
+ timeout = 1000;
+
+ /* Set an interrupt to XP70 */
+ writel(1 << num, PRCM_MBOX_CPU_SET);
+
+ while ((readl(PRCM_MBOX_CPU_VAL) & (1 << num)) && timeout)
+ timeout--;
+
+ if (!timeout) {
+ printf("PRCMU operation timed out\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+/**
+ * prcmu_i2c_read - PRCMU - 4500 communication using PRCMU I2C
+ * @reg: - db8500 register bank to be accessed
+ * @slave: - db8500 register to be accessed
+ * Returns: ACK_MB5 value containing the status
+ */
+int prcmu_i2c_read(u8 reg, u16 slave)
+{
+ uint8_t i2c_status;
+ uint8_t i2c_val;
+
+ if (!prcmu_is_ready())
+ return -1;
+
+ debug("\nprcmu_4500_i2c_read:bank=%x;reg=%x;\n",
+ reg, slave);
+
+ /* prepare the data for mailbox 5 */
+ writeb((reg << 1) | I2CREAD, PRCM_REQ_MB5_I2COPTYPE_REG);
+ writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
+ writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
+ writeb(0, PRCM_REQ_MB5_I2CVAL);
+
+ _wait_for_req_complete(REQ_MB5);
+
+ /* retrieve values */
+ debug("ack-mb5:transfer status = %x\n",
+ readb(PRCM_ACK_MB5_STATUS));
+ debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
+ debug("ack-mb5:slave_add = %x\n",
+ readb(PRCM_ACK_MB5_SLAVE));
+ debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
+
+ i2c_status = readb(PRCM_ACK_MB5_STATUS);
+ i2c_val = readb(PRCM_ACK_MB5_VAL);
+
+ if (i2c_status == I2C_RD_OK)
+ return i2c_val;
+ else {
+
+ printf("prcmu_i2c_read:read return status= %d\n",
+ i2c_status);
+ return -1;
+ }
+
+}
+
+/**
+ * prcmu_i2c_write - PRCMU-db8500 communication using PRCMU I2C
+ * @reg: - db8500 register bank to be accessed
+ * @slave: - db800 register to be written to
+ * @reg_data: - the data to write
+ * Returns: ACK_MB5 value containing the status
+ */
+int prcmu_i2c_write(u8 reg, u16 slave, u8 reg_data)
+{
+ uint8_t i2c_status;
+
+ if (!prcmu_is_ready())
+ return -1;
+
+ debug("\nprcmu_4500_i2c_write:bank=%x;reg=%x;\n",
+ reg, slave);
+
+ /* prepare the data for mailbox 5 */
+ writeb((reg << 1) | I2CWRITE, PRCM_REQ_MB5_I2COPTYPE_REG);
+ writeb((1 << 3) | 0x0, PRCM_REQ_MB5_BIT_FIELDS);
+ writeb(slave, PRCM_REQ_MB5_I2CSLAVE);
+ writeb(reg_data, PRCM_REQ_MB5_I2CVAL);
+
+ debug("\ncpu_is_u8500v11\n");
+ _wait_for_req_complete(REQ_MB5);
+
+ /* retrieve values */
+ debug("ack-mb5:transfer status = %x\n",
+ readb(PRCM_ACK_MB5_STATUS));
+ debug("ack-mb5:reg bank = %x\n", readb(PRCM_ACK_MB5) >> 1);
+ debug("ack-mb5:slave_add = %x\n",
+ readb(PRCM_ACK_MB5_SLAVE));
+ debug("ack-mb5:reg_val = %d\n", readb(PRCM_ACK_MB5_VAL));
+
+ i2c_status = readb(PRCM_ACK_MB5_STATUS);
+ debug("\ni2c_status = %x\n", i2c_status);
+ if (i2c_status == I2C_WR_OK)
+ return 0;
+ else {
+ printf("ape-i2c: i2c_status : 0x%x\n", i2c_status);
+ return -1;
+ }
+}
diff --git a/arch/arm/include/asm/arch-u8500/prcmu.h b/arch/arm/include/asm/arch-u8500/prcmu.h
new file mode 100644
index 000000000..0836983fa
--- /dev/null
+++ b/arch/arm/include/asm/arch-u8500/prcmu.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2009 ST-Ericsson SA
+ *
+ * Copied from the Linux version:
+ * Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#ifndef __MACH_PRCMU_FW_V1_H
+#define __MACH_PRCMU_FW_V1_H
+
+#define AP_EXECUTE 2
+#define I2CREAD 1
+#define I2C_WR_OK 1
+#define I2C_RD_OK 2
+#define I2CWRITE 0
+
+#define _PRCMU_TCDM_BASE U8500_PRCMU_TCDM_BASE
+#define PRCM_XP70_CUR_PWR_STATE (_PRCMU_TCDM_BASE + 0xFFC) /* 4 BYTES */
+
+#define PRCM_REQ_MB5 (_PRCMU_TCDM_BASE + 0xE44) /* 4 bytes */
+#define PRCM_ACK_MB5 (_PRCMU_TCDM_BASE + 0xDF4) /* 4 bytes */
+
+/* Mailbox 5 Requests */
+#define PRCM_REQ_MB5_I2COPTYPE_REG (PRCM_REQ_MB5 + 0x0)
+#define PRCM_REQ_MB5_BIT_FIELDS (PRCM_REQ_MB5 + 0x1)
+#define PRCM_REQ_MB5_I2CSLAVE (PRCM_REQ_MB5 + 0x2)
+#define PRCM_REQ_MB5_I2CVAL (PRCM_REQ_MB5 + 0x3)
+
+/* Mailbox 5 ACKs */
+#define PRCM_ACK_MB5_STATUS (PRCM_ACK_MB5 + 0x1)
+#define PRCM_ACK_MB5_SLAVE (PRCM_ACK_MB5 + 0x2)
+#define PRCM_ACK_MB5_VAL (PRCM_ACK_MB5 + 0x3)
+
+#define LOW_POWER_WAKEUP 1
+#define EXE_WAKEUP 0
+
+#define REQ_MB5 5
+
+extern int prcmu_i2c_read(u8 reg, u16 slave);
+extern int prcmu_i2c_write(u8 reg, u16 slave, u8 reg_data);
+
+#endif /* __MACH_PRCMU_FW_V1_H */