ux500: Add prcmu support for operating points
Adds support in PRCMU driver to handle CPU and APE operating points.
Signed-off-by: Martin Persson <martin.persson@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
diff --git a/arch/arm/mach-ux500/prcmu.c b/arch/arm/mach-ux500/prcmu.c
index 07d5f13..c522d26 100644
--- a/arch/arm/mach-ux500/prcmu.c
+++ b/arch/arm/mach-ux500/prcmu.c
@@ -1,10 +1,14 @@
/*
- * Copyright (C) ST Ericsson SA 2010
+ * Copyright (C) STMicroelectronics 2009
+ * Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
+ * Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
+ * Author: Sundar Iyer <sundar.iyer@stericsson.com>
* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com>
*
- * U8500 PRCMU driver.
+ * U8500 PRCM Unit interface driver
+ *
*/
#include <linux/kernel.h>
#include <linux/module.h>
@@ -19,13 +23,27 @@
#include <mach/hardware.h>
#include <mach/prcmu-regs.h>
+#include <mach/prcmu-defs.h>
/* Global var to runtime determine TCDM base for v2 or v1 */
static __iomem void *tcdm_base;
+#define _MBOX_HEADER (tcdm_base + 0xFE8)
+#define MBOX_HEADER_REQ_MB0 (_MBOX_HEADER + 0x0)
+
+#define REQ_MB1 (tcdm_base + 0xFD0)
#define REQ_MB5 (tcdm_base + 0xE44)
+
+#define REQ_MB1_ARMOPP (REQ_MB1 + 0x0)
+#define REQ_MB1_APEOPP (REQ_MB1 + 0x1)
+#define REQ_MB1_BOOSTOPP (REQ_MB1 + 0x2)
+
+#define ACK_MB1 (tcdm_base + 0xE04)
#define ACK_MB5 (tcdm_base + 0xDF4)
+#define ACK_MB1_CURR_ARMOPP (ACK_MB1 + 0x0)
+#define ACK_MB1_CURR_APEOPP (ACK_MB1 + 0x1)
+
#define REQ_MB5_I2C_SLAVE_OP (REQ_MB5)
#define REQ_MB5_I2C_HW_BITS (REQ_MB5 + 1)
#define REQ_MB5_I2C_REG (REQ_MB5 + 2)
@@ -34,12 +52,33 @@
#define ACK_MB5_I2C_STATUS (ACK_MB5 + 1)
#define ACK_MB5_I2C_VAL (ACK_MB5 + 3)
+#define PRCM_AVS_VARM_MAX_OPP (tcdm_base + 0x2E4)
+#define PRCM_AVS_ISMODEENABLE 7
+#define PRCM_AVS_ISMODEENABLE_MASK (1 << PRCM_AVS_ISMODEENABLE)
+
#define I2C_WRITE(slave) \
(((slave) << 1) | (cpu_is_u8500v2() ? BIT(6) : 0))
#define I2C_READ(slave) \
(((slave) << 1) | (cpu_is_u8500v2() ? BIT(6) : 0) | BIT(0))
#define I2C_STOP_EN BIT(3)
+enum mb1_h {
+ MB1H_ARM_OPP = 1,
+ MB1H_APE_OPP,
+ MB1H_ARM_APE_OPP,
+};
+
+static struct {
+ struct mutex lock;
+ struct completion work;
+ struct {
+ u8 arm_opp;
+ u8 ape_opp;
+ u8 arm_status;
+ u8 ape_status;
+ } ack;
+} mb1_transfer;
+
enum ack_mb5_status {
I2C_WR_OK = 0x01,
I2C_RD_OK = 0x02,
@@ -148,6 +187,104 @@
}
EXPORT_SYMBOL(prcmu_abb_write);
+static int set_ape_cpu_opps(u8 header, enum prcmu_ape_opp ape_opp,
+ enum prcmu_cpu_opp cpu_opp)
+{
+ bool do_ape;
+ bool do_arm;
+ int err = 0;
+
+ do_ape = ((header == MB1H_APE_OPP) || (header == MB1H_ARM_APE_OPP));
+ do_arm = ((header == MB1H_ARM_OPP) || (header == MB1H_ARM_APE_OPP));
+
+ mutex_lock(&mb1_transfer.lock);
+
+ while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(1))
+ cpu_relax();
+
+ writeb(0, MBOX_HEADER_REQ_MB0);
+ writeb(cpu_opp, REQ_MB1_ARMOPP);
+ writeb(ape_opp, REQ_MB1_APEOPP);
+ writeb(0, REQ_MB1_BOOSTOPP);
+ writel(MBOX_BIT(1), PRCM_MBOX_CPU_SET);
+ wait_for_completion(&mb1_transfer.work);
+ if ((do_ape) && (mb1_transfer.ack.ape_status != 0))
+ err = -EIO;
+ if ((do_arm) && (mb1_transfer.ack.arm_status != 0))
+ err = -EIO;
+
+ mutex_unlock(&mb1_transfer.lock);
+
+ return err;
+}
+
+/**
+ * prcmu_set_ape_opp() - Set the OPP of the APE.
+ * @opp: The OPP to set.
+ *
+ * This function sets the OPP of the APE.
+ */
+int prcmu_set_ape_opp(enum prcmu_ape_opp opp)
+{
+ return set_ape_cpu_opps(MB1H_APE_OPP, opp, APE_OPP_NO_CHANGE);
+}
+EXPORT_SYMBOL(prcmu_set_ape_opp);
+
+/**
+ * prcmu_set_cpu_opp() - Set the OPP of the CPU.
+ * @opp: The OPP to set.
+ *
+ * This function sets the OPP of the CPU.
+ */
+int prcmu_set_cpu_opp(enum prcmu_cpu_opp opp)
+{
+ return set_ape_cpu_opps(MB1H_ARM_OPP, CPU_OPP_NO_CHANGE, opp);
+}
+EXPORT_SYMBOL(prcmu_set_cpu_opp);
+
+/**
+ * prcmu_set_ape_cpu_opps() - Set the OPPs of the APE and the CPU.
+ * @ape_opp: The APE OPP to set.
+ * @cpu_opp: The CPU OPP to set.
+ *
+ * This function sets the OPPs of the APE and the CPU.
+ */
+int prcmu_set_ape_cpu_opps(enum prcmu_ape_opp ape_opp,
+ enum prcmu_cpu_opp cpu_opp)
+{
+ return set_ape_cpu_opps(MB1H_ARM_APE_OPP, ape_opp, cpu_opp);
+}
+EXPORT_SYMBOL(prcmu_set_ape_cpu_opps);
+
+/**
+ * prcmu_get_ape_opp() - Get the OPP of the APE.
+ *
+ * This function gets the OPP of the APE.
+ */
+enum prcmu_ape_opp prcmu_get_ape_opp(void)
+{
+ return readb(ACK_MB1_CURR_APEOPP);
+}
+EXPORT_SYMBOL(prcmu_get_ape_opp);
+
+/**
+ * prcmu_get_cpu_opp() - Get the OPP of the CPU.
+ *
+ * This function gets the OPP of the CPU. The OPP is specified in %%.
+ * PRCMU_OPP_EXT is a special OPP value, not specified in %%.
+ */
+int prcmu_get_cpu_opp(void)
+{
+ return readb(ACK_MB1_CURR_ARMOPP);
+}
+EXPORT_SYMBOL(prcmu_get_cpu_opp);
+
+bool prcmu_has_arm_maxopp(void)
+{
+ return (readb(PRCM_AVS_VARM_MAX_OPP) & PRCM_AVS_ISMODEENABLE_MASK)
+ == PRCM_AVS_ISMODEENABLE_MASK;
+}
+
static void read_mailbox_0(void)
{
writel(MBOX_BIT(0), PRCM_ARM_IT1_CLEAR);
@@ -155,6 +292,9 @@
static void read_mailbox_1(void)
{
+ mb1_transfer.ack.arm_opp = readb(ACK_MB1_CURR_ARMOPP);
+ mb1_transfer.ack.ape_opp = readb(ACK_MB1_CURR_APEOPP);
+ complete(&mb1_transfer.work);
writel(MBOX_BIT(1), PRCM_ARM_IT1_CLEAR);
}
@@ -234,6 +374,13 @@
static int __init prcmu_init(void)
{
+ if (cpu_is_u8500ed()) {
+ pr_err("prcmu: Unsupported chip version\n");
+ return 0;
+ }
+
+ mutex_init(&mb1_transfer.lock);
+ init_completion(&mb1_transfer.work);
mutex_init(&mb5_transfer.lock);
init_completion(&mb5_transfer.work);