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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>
This commit is contained in:
Martin Persson 2010-12-08 15:13:28 +01:00 committed by Linus Walleij
parent 20e218a77f
commit e0befb23df
4 changed files with 202 additions and 8 deletions
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30
arch/arm/mach-ux500/include/mach/prcmu-defs.h Normal file
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@ -0,0 +1,30 @@
/*
* Copyright (C) STMicroelectronics 2009
* Copyright (C) ST-Ericsson SA 2010
*
* Author: Sundar Iyer <sundar.iyer@stericsson.com>
* Author: Martin Persson <martin.persson@stericsson.com>
*
* License Terms: GNU General Public License v2
*
* PRCM Unit definitions
*/
#ifndef __MACH_PRCMU_DEFS_H
#define __MACH_PRCMU_DEFS_H
enum prcmu_cpu_opp {
CPU_OPP_INIT = 0x00,
CPU_OPP_NO_CHANGE = 0x01,
CPU_OPP_100 = 0x02,
CPU_OPP_50 = 0x03,
CPU_OPP_MAX = 0x04,
CPU_OPP_EXT_CLK = 0x07
};
enum prcmu_ape_opp {
APE_OPP_NO_CHANGE = 0x00,
APE_OPP_100 = 0x02,
APE_OPP_50 = 0x03,
};
#endif /* __MACH_PRCMU_DEFS_H */

15
arch/arm/mach-ux500/include/mach/prcmu-regs.h
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@ -1,10 +1,15 @@
/*
* Copyright (c) 2009 ST-Ericsson SA
* Copyright (C) STMicroelectronics 2009
* Copyright (C) ST-Ericsson SA 2010
*
* 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.
* Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
* Author: Sundar Iyer <sundar.iyer@stericsson.com>
*
* License Terms: GNU General Public License v2
*
* PRCM Unit registers
*/
#ifndef __MACH_PRCMU_REGS_H
#define __MACH_PRCMU_REGS_H
@ -88,4 +93,4 @@
/* Miscellaneous unit registers */
#define PRCM_DSI_SW_RESET (_PRCMU_BASE + 0x324)
#endif /* __MACH_PRCMU__REGS_H */
#endif /* __MACH_PRCMU_REGS_H */

14
arch/arm/mach-ux500/include/mach/prcmu.h
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@ -2,15 +2,27 @@
* Copyright (C) STMicroelectronics 2009
* Copyright (C) ST-Ericsson SA 2010
*
* Author: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
* Author: Sundar Iyer <sundar.iyer@stericsson.com>
* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com>
*
* License Terms: GNU General Public License v2
*
* PRCMU f/w APIs
* PRCM Unit f/w API
*/
#ifndef __MACH_PRCMU_H
#define __MACH_PRCMU_H
#include <mach/prcmu-defs.h>
void __init prcmu_early_init(void);
int prcmu_abb_read(u8 slave, u8 reg, u8 *value, u8 size);
int prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size);
int prcmu_set_ape_opp(enum prcmu_ape_opp opp);
int prcmu_set_cpu_opp(enum prcmu_cpu_opp opp);
int prcmu_set_ape_cpu_opps(enum prcmu_ape_opp ape_opp,
enum prcmu_cpu_opp cpu_opp);
int prcmu_get_ape_opp(void);
int prcmu_get_cpu_opp(void);
bool prcmu_has_arm_maxopp(void);
#endif /* __MACH_PRCMU_H */

151
arch/arm/mach-ux500/prcmu.c
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@ -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 @@ static __iomem void *tcdm_base;
#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 @@ unlock_and_return:
}
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_0(void)
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 @@ void __init prcmu_early_init(void)
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);