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mfd: add DB5500 PRCMU driver

Browse source 
This adds the DB5500 PRCMU driver. Right now this one is pretty
restricted in functionality, exposing a simple interface to send
I2C messages.

Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2011-05-03 18:14:48 +02:00
parent 3df57bcf5a
commit 8317797ca6
7 changed files with 623 additions and 0 deletions
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1
arch/arm/mach-ux500/Kconfig
View file

@ -12,6 +12,7 @@ menu "Ux500 SoC"
config UX500_SOC_DB5500
bool "DB5500"
select MFD_DB5500_PRCMU
config UX500_SOC_DB8500
bool "DB8500"

3
arch/arm/mach-ux500/cpu.c
View file

@ -9,6 +9,7 @@
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/mfd/db8500-prcmu.h>
#include <linux/mfd/db5500-prcmu.h>
#include <asm/cacheflush.h>
#include <asm/hardware/cache-l2x0.h>
@ -49,6 +50,8 @@ void __init ux500_init_irq(void)
* Init clocks here so that they are available for system timer
* initialization.
*/
if (cpu_is_u5500())
db5500_prcmu_early_init();
if (cpu_is_u8500())
prcmu_early_init();
clk_init();

10
drivers/mfd/Kconfig
View file

@ -585,6 +585,16 @@ config MFD_DB8500_PRCMU
system controller running an XP70 microprocessor, which is accessed
through a register map.
config MFD_DB5500_PRCMU
bool "ST-Ericsson DB5500 Power Reset Control Management Unit"
depends on UX500_SOC_DB5500
select MFD_CORE
help
Select this option to enable support for the DB5500 Power Reset
and Control Management Unit. This is basically an autonomous
system controller running an XP70 microprocessor, which is accessed
through a register map.
config MFD_CS5535
tristate "Support for CS5535 and CS5536 southbridge core functions"
select MFD_CORE

1
drivers/mfd/Makefile
View file

@ -79,6 +79,7 @@ obj-$(CONFIG_AB8500_GPADC) += ab8500-gpadc.o
obj-$(CONFIG_MFD_DB8500_PRCMU) += db8500-prcmu.o
# ab8500-i2c need to come after db8500-prcmu (which provides the channel)
obj-$(CONFIG_AB8500_I2C_CORE) += ab8500-i2c.o
obj-$(CONFIG_MFD_DB5500_PRCMU) += db5500-prcmu.o
obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
obj-$(CONFIG_LPC_SCH) += lpc_sch.o

115
drivers/mfd/db5500-prcmu-regs.h Normal file
View file

@ -0,0 +1,115 @@
/*
* Copyright (C) STMicroelectronics 2009
* Copyright (C) ST-Ericsson SA 2010
*
* 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
#include <mach/hardware.h>
#define PRCM_ARM_PLLDIVPS (_PRCMU_BASE + 0x118)
#define PRCM_ARM_PLLDIVPS_ARM_BRM_RATE 0x3f
#define PRCM_ARM_PLLDIVPS_MAX_MASK 0xf
#define PRCM_PLLARM_LOCKP (_PRCMU_BASE + 0x0a8)
#define PRCM_PLLARM_LOCKP_PRCM_PLLARM_LOCKP3 0x2
#define PRCM_ARM_CHGCLKREQ (_PRCMU_BASE + 0x114)
#define PRCM_ARM_CHGCLKREQ_PRCM_ARM_CHGCLKREQ 0x1
#define PRCM_PLLARM_ENABLE (_PRCMU_BASE + 0x98)
#define PRCM_PLLARM_ENABLE_PRCM_PLLARM_ENABLE 0x1
#define PRCM_PLLARM_ENABLE_PRCM_PLLARM_COUNTON 0x100
#define PRCM_ARMCLKFIX_MGT (_PRCMU_BASE + 0x0)
#define PRCM_A9_RESETN_CLR (_PRCMU_BASE + 0x1f4)
#define PRCM_A9_RESETN_SET (_PRCMU_BASE + 0x1f0)
#define PRCM_ARM_LS_CLAMP (_PRCMU_BASE + 0x30c)
#define PRCM_SRAM_A9 (_PRCMU_BASE + 0x308)
/* ARM WFI Standby signal register */
#define PRCM_ARM_WFI_STANDBY (_PRCMU_BASE + 0x130)
#define PRCM_IOCR (_PRCMU_BASE + 0x310)
#define PRCM_IOCR_IOFORCE 0x1
/* CPU mailbox registers */
#define PRCM_MBOX_CPU_VAL (_PRCMU_BASE + 0x0fc)
#define PRCM_MBOX_CPU_SET (_PRCMU_BASE + 0x100)
#define PRCM_MBOX_CPU_CLR (_PRCMU_BASE + 0x104)
/* Dual A9 core interrupt management unit registers */
#define PRCM_A9_MASK_REQ (_PRCMU_BASE + 0x328)
#define PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ 0x1
#define PRCM_A9_MASK_ACK (_PRCMU_BASE + 0x32c)
#define PRCM_ARMITMSK31TO0 (_PRCMU_BASE + 0x11c)
#define PRCM_ARMITMSK63TO32 (_PRCMU_BASE + 0x120)
#define PRCM_ARMITMSK95TO64 (_PRCMU_BASE + 0x124)
#define PRCM_ARMITMSK127TO96 (_PRCMU_BASE + 0x128)
#define PRCM_POWER_STATE_VAL (_PRCMU_BASE + 0x25C)
#define PRCM_ARMITVAL31TO0 (_PRCMU_BASE + 0x260)
#define PRCM_ARMITVAL63TO32 (_PRCMU_BASE + 0x264)
#define PRCM_ARMITVAL95TO64 (_PRCMU_BASE + 0x268)
#define PRCM_ARMITVAL127TO96 (_PRCMU_BASE + 0x26C)
#define PRCM_HOSTACCESS_REQ (_PRCMU_BASE + 0x334)
#define ARM_WAKEUP_MODEM 0x1
#define PRCM_ARM_IT1_CLEAR (_PRCMU_BASE + 0x48C)
#define PRCM_ARM_IT1_VAL (_PRCMU_BASE + 0x494)
#define PRCM_HOLD_EVT (_PRCMU_BASE + 0x174)
#define PRCM_ITSTATUS0 (_PRCMU_BASE + 0x148)
#define PRCM_ITSTATUS1 (_PRCMU_BASE + 0x150)
#define PRCM_ITSTATUS2 (_PRCMU_BASE + 0x158)
#define PRCM_ITSTATUS3 (_PRCMU_BASE + 0x160)
#define PRCM_ITSTATUS4 (_PRCMU_BASE + 0x168)
#define PRCM_ITSTATUS5 (_PRCMU_BASE + 0x484)
#define PRCM_ITCLEAR5 (_PRCMU_BASE + 0x488)
#define PRCM_ARMIT_MASKXP70_IT (_PRCMU_BASE + 0x1018)
/* System reset register */
#define PRCM_APE_SOFTRST (_PRCMU_BASE + 0x228)
/* Level shifter and clamp control registers */
#define PRCM_MMIP_LS_CLAMP_SET (_PRCMU_BASE + 0x420)
#define PRCM_MMIP_LS_CLAMP_CLR (_PRCMU_BASE + 0x424)
/* PRCMU clock/PLL/reset registers */
#define PRCM_PLLDSI_FREQ (_PRCMU_BASE + 0x500)
#define PRCM_PLLDSI_ENABLE (_PRCMU_BASE + 0x504)
#define PRCM_PLLDSI_LOCKP (_PRCMU_BASE + 0x508)
#define PRCM_LCDCLK_MGT (_PRCMU_BASE + 0x044)
#define PRCM_MCDECLK_MGT (_PRCMU_BASE + 0x064)
#define PRCM_HDMICLK_MGT (_PRCMU_BASE + 0x058)
#define PRCM_TVCLK_MGT (_PRCMU_BASE + 0x07c)
#define PRCM_DSI_PLLOUT_SEL (_PRCMU_BASE + 0x530)
#define PRCM_DSITVCLK_DIV (_PRCMU_BASE + 0x52C)
#define PRCM_PLLDSI_LOCKP (_PRCMU_BASE + 0x508)
#define PRCM_APE_RESETN_SET (_PRCMU_BASE + 0x1E4)
#define PRCM_APE_RESETN_CLR (_PRCMU_BASE + 0x1E8)
#define PRCM_CLKOCR (_PRCMU_BASE + 0x1CC)
/* ePOD and memory power signal control registers */
#define PRCM_EPOD_C_SET (_PRCMU_BASE + 0x410)
#define PRCM_SRAM_LS_SLEEP (_PRCMU_BASE + 0x304)
/* Debug power control unit registers */
#define PRCM_POWER_STATE_SET (_PRCMU_BASE + 0x254)
/* Miscellaneous unit registers */
#define PRCM_DSI_SW_RESET (_PRCMU_BASE + 0x324)
#define PRCM_GPIOCR (_PRCMU_BASE + 0x138)
#define PRCM_GPIOCR_DBG_STM_MOD_CMD1 0x800
#define PRCM_GPIOCR_DBG_UARTMOD_CMD0 0x1
#endif /* __MACH_PRCMU__REGS_H */

448
drivers/mfd/db5500-prcmu.c Normal file
View file

@ -0,0 +1,448 @@
/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com>
*
* U5500 PRCM Unit interface driver
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/completion.h>
#include <linux/irq.h>
#include <linux/jiffies.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/mfd/db5500-prcmu.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <mach/db5500-regs.h>
#include "db5500-prcmu-regs.h"
#define _PRCM_MB_HEADER (tcdm_base + 0xFE8)
#define PRCM_REQ_MB0_HEADER (_PRCM_MB_HEADER + 0x0)
#define PRCM_REQ_MB1_HEADER (_PRCM_MB_HEADER + 0x1)
#define PRCM_REQ_MB2_HEADER (_PRCM_MB_HEADER + 0x2)
#define PRCM_REQ_MB3_HEADER (_PRCM_MB_HEADER + 0x3)
#define PRCM_REQ_MB4_HEADER (_PRCM_MB_HEADER + 0x4)
#define PRCM_REQ_MB5_HEADER (_PRCM_MB_HEADER + 0x5)
#define PRCM_REQ_MB6_HEADER (_PRCM_MB_HEADER + 0x6)
#define PRCM_REQ_MB7_HEADER (_PRCM_MB_HEADER + 0x7)
#define PRCM_ACK_MB0_HEADER (_PRCM_MB_HEADER + 0x8)
#define PRCM_ACK_MB1_HEADER (_PRCM_MB_HEADER + 0x9)
#define PRCM_ACK_MB2_HEADER (_PRCM_MB_HEADER + 0xa)
#define PRCM_ACK_MB3_HEADER (_PRCM_MB_HEADER + 0xb)
#define PRCM_ACK_MB4_HEADER (_PRCM_MB_HEADER + 0xc)
#define PRCM_ACK_MB5_HEADER (_PRCM_MB_HEADER + 0xd)
#define PRCM_ACK_MB6_HEADER (_PRCM_MB_HEADER + 0xe)
#define PRCM_ACK_MB7_HEADER (_PRCM_MB_HEADER + 0xf)
/* Req Mailboxes */
#define PRCM_REQ_MB0 (tcdm_base + 0xFD8)
#define PRCM_REQ_MB1 (tcdm_base + 0xFCC)
#define PRCM_REQ_MB2 (tcdm_base + 0xFC4)
#define PRCM_REQ_MB3 (tcdm_base + 0xFC0)
#define PRCM_REQ_MB4 (tcdm_base + 0xF98)
#define PRCM_REQ_MB5 (tcdm_base + 0xF90)
#define PRCM_REQ_MB6 (tcdm_base + 0xF8C)
#define PRCM_REQ_MB7 (tcdm_base + 0xF84)
/* Ack Mailboxes */
#define PRCM_ACK_MB0 (tcdm_base + 0xF38)
#define PRCM_ACK_MB1 (tcdm_base + 0xF30)
#define PRCM_ACK_MB2 (tcdm_base + 0xF24)
#define PRCM_ACK_MB3 (tcdm_base + 0xF20)
#define PRCM_ACK_MB4 (tcdm_base + 0xF1C)
#define PRCM_ACK_MB5 (tcdm_base + 0xF14)
#define PRCM_ACK_MB6 (tcdm_base + 0xF0C)
#define PRCM_ACK_MB7 (tcdm_base + 0xF08)
enum mb_return_code {
RC_SUCCESS,
RC_FAIL,
};
/* Mailbox 0 headers. */
enum mb0_header {
/* request */
RMB0H_PWR_STATE_TRANS = 1,
RMB0H_WAKE_UP_CFG,
RMB0H_RD_WAKE_UP_ACK,
/* acknowledge */
AMB0H_WAKE_UP = 1,
};
/* Mailbox 5 headers. */
enum mb5_header {
MB5H_I2C_WRITE = 1,
MB5H_I2C_READ,
};
/* Request mailbox 5 fields. */
#define PRCM_REQ_MB5_I2C_SLAVE (PRCM_REQ_MB5 + 0)
#define PRCM_REQ_MB5_I2C_REG (PRCM_REQ_MB5 + 1)
#define PRCM_REQ_MB5_I2C_SIZE (PRCM_REQ_MB5 + 2)
#define PRCM_REQ_MB5_I2C_DATA (PRCM_REQ_MB5 + 4)
/* Acknowledge mailbox 5 fields. */
#define PRCM_ACK_MB5_RETURN_CODE (PRCM_ACK_MB5 + 0)
#define PRCM_ACK_MB5_I2C_DATA (PRCM_ACK_MB5 + 4)
#define NUM_MB 8
#define MBOX_BIT BIT
#define ALL_MBOX_BITS (MBOX_BIT(NUM_MB) - 1)
/*
* Used by MCDE to setup all necessary PRCMU registers
*/
#define PRCMU_RESET_DSIPLL 0x00004000
#define PRCMU_UNCLAMP_DSIPLL 0x00400800
/* HDMI CLK MGT PLLSW=001 (PLLSOC0), PLLDIV=0x8, = 50 Mhz*/
#define PRCMU_DSI_CLOCK_SETTING 0x00000128
/* TVCLK_MGT PLLSW=001 (PLLSOC0) PLLDIV=0x13, = 19.05 MHZ */
#define PRCMU_DSI_LP_CLOCK_SETTING 0x00000135
#define PRCMU_PLLDSI_FREQ_SETTING 0x0004013C
#define PRCMU_DSI_PLLOUT_SEL_SETTING 0x00000002
#define PRCMU_ENABLE_ESCAPE_CLOCK_DIV 0x03000101
#define PRCMU_DISABLE_ESCAPE_CLOCK_DIV 0x00000101
#define PRCMU_ENABLE_PLLDSI 0x00000001
#define PRCMU_DISABLE_PLLDSI 0x00000000
#define PRCMU_DSI_RESET_SW 0x00000003
#define PRCMU_PLLDSI_LOCKP_LOCKED 0x3
/*
* mb0_transfer - state needed for mailbox 0 communication.
* @lock: The transaction lock.
*/
static struct {
spinlock_t lock;
} mb0_transfer;
/*
* mb5_transfer - state needed for mailbox 5 communication.
* @lock: The transaction lock.
* @work: The transaction completion structure.
* @ack: Reply ("acknowledge") data.
*/
static struct {
struct mutex lock;
struct completion work;
struct {
u8 header;
u8 status;
u8 value[4];
} ack;
} mb5_transfer;
/* PRCMU TCDM base IO address. */
static __iomem void *tcdm_base;
/**
* db5500_prcmu_abb_read() - Read register value(s) from the ABB.
* @slave: The I2C slave address.
* @reg: The (start) register address.
* @value: The read out value(s).
* @size: The number of registers to read.
*
* Reads register value(s) from the ABB.
* @size has to be <= 4.
*/
int db5500_prcmu_abb_read(u8 slave, u8 reg, u8 *value, u8 size)
{
int r;
if ((size < 1) || (4 < size))
return -EINVAL;
mutex_lock(&mb5_transfer.lock);
while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(5))
cpu_relax();
writeb(slave, PRCM_REQ_MB5_I2C_SLAVE);
writeb(reg, PRCM_REQ_MB5_I2C_REG);
writeb(size, PRCM_REQ_MB5_I2C_SIZE);
writeb(MB5H_I2C_READ, PRCM_REQ_MB5_HEADER);
writel(MBOX_BIT(5), PRCM_MBOX_CPU_SET);
wait_for_completion(&mb5_transfer.work);
r = 0;
if ((mb5_transfer.ack.header == MB5H_I2C_READ) &&
(mb5_transfer.ack.status == RC_SUCCESS))
memcpy(value, mb5_transfer.ack.value, (size_t)size);
else
r = -EIO;
mutex_unlock(&mb5_transfer.lock);
return r;
}
/**
* db5500_prcmu_abb_write() - Write register value(s) to the ABB.
* @slave: The I2C slave address.
* @reg: The (start) register address.
* @value: The value(s) to write.
* @size: The number of registers to write.
*
* Writes register value(s) to the ABB.
* @size has to be <= 4.
*/
int db5500_prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size)
{
int r;
if ((size < 1) || (4 < size))
return -EINVAL;
mutex_lock(&mb5_transfer.lock);
while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(5))
cpu_relax();
writeb(slave, PRCM_REQ_MB5_I2C_SLAVE);
writeb(reg, PRCM_REQ_MB5_I2C_REG);
writeb(size, PRCM_REQ_MB5_I2C_SIZE);
memcpy_toio(PRCM_REQ_MB5_I2C_DATA, value, size);
writeb(MB5H_I2C_WRITE, PRCM_REQ_MB5_HEADER);
writel(MBOX_BIT(5), PRCM_MBOX_CPU_SET);
wait_for_completion(&mb5_transfer.work);
if ((mb5_transfer.ack.header == MB5H_I2C_WRITE) &&
(mb5_transfer.ack.status == RC_SUCCESS))
r = 0;
else
r = -EIO;
mutex_unlock(&mb5_transfer.lock);
return r;
}
int db5500_prcmu_enable_dsipll(void)
{
int i;
/* Enable DSIPLL_RESETN resets */
writel(PRCMU_RESET_DSIPLL, PRCM_APE_RESETN_CLR);
/* Unclamp DSIPLL in/out */
writel(PRCMU_UNCLAMP_DSIPLL, PRCM_MMIP_LS_CLAMP_CLR);
/* Set DSI PLL FREQ */
writel(PRCMU_PLLDSI_FREQ_SETTING, PRCM_PLLDSI_FREQ);
writel(PRCMU_DSI_PLLOUT_SEL_SETTING,
PRCM_DSI_PLLOUT_SEL);
/* Enable Escape clocks */
writel(PRCMU_ENABLE_ESCAPE_CLOCK_DIV, PRCM_DSITVCLK_DIV);
/* Start DSI PLL */
writel(PRCMU_ENABLE_PLLDSI, PRCM_PLLDSI_ENABLE);
/* Reset DSI PLL */
writel(PRCMU_DSI_RESET_SW, PRCM_DSI_SW_RESET);
for (i = 0; i < 10; i++) {
if ((readl(PRCM_PLLDSI_LOCKP) &
PRCMU_PLLDSI_LOCKP_LOCKED) == PRCMU_PLLDSI_LOCKP_LOCKED)
break;
udelay(100);
}
/* Release DSIPLL_RESETN */
writel(PRCMU_RESET_DSIPLL, PRCM_APE_RESETN_SET);
return 0;
}
int db5500_prcmu_disable_dsipll(void)
{
/* Disable dsi pll */
writel(PRCMU_DISABLE_PLLDSI, PRCM_PLLDSI_ENABLE);
/* Disable escapeclock */
writel(PRCMU_DISABLE_ESCAPE_CLOCK_DIV, PRCM_DSITVCLK_DIV);
return 0;
}
int db5500_prcmu_set_display_clocks(void)
{
/* HDMI and TVCLK Should be handled somewhere else */
/* PLLDIV=8, PLLSW=2, CLKEN=1 */
writel(PRCMU_DSI_CLOCK_SETTING, PRCM_HDMICLK_MGT);
/* PLLDIV=14, PLLSW=2, CLKEN=1 */
writel(PRCMU_DSI_LP_CLOCK_SETTING, PRCM_TVCLK_MGT);
return 0;
}
static void ack_dbb_wakeup(void)
{
unsigned long flags;
spin_lock_irqsave(&mb0_transfer.lock, flags);
while (readl(PRCM_MBOX_CPU_VAL) & MBOX_BIT(0))
cpu_relax();
writeb(RMB0H_RD_WAKE_UP_ACK, PRCM_REQ_MB0_HEADER);
writel(MBOX_BIT(0), PRCM_MBOX_CPU_SET);
spin_unlock_irqrestore(&mb0_transfer.lock, flags);
}
static inline void print_unknown_header_warning(u8 n, u8 header)
{
pr_warning("prcmu: Unknown message header (%d) in mailbox %d.\n",
header, n);
}
static bool read_mailbox_0(void)
{
bool r;
u8 header;
header = readb(PRCM_ACK_MB0_HEADER);
switch (header) {
case AMB0H_WAKE_UP:
r = true;
break;
default:
print_unknown_header_warning(0, header);
r = false;
break;
}
writel(MBOX_BIT(0), PRCM_ARM_IT1_CLEAR);
return r;
}
static bool read_mailbox_1(void)
{
writel(MBOX_BIT(1), PRCM_ARM_IT1_CLEAR);
return false;
}
static bool read_mailbox_2(void)
{
writel(MBOX_BIT(2), PRCM_ARM_IT1_CLEAR);
return false;
}
static bool read_mailbox_3(void)
{
writel(MBOX_BIT(3), PRCM_ARM_IT1_CLEAR);
return false;
}
static bool read_mailbox_4(void)
{
writel(MBOX_BIT(4), PRCM_ARM_IT1_CLEAR);
return false;
}
static bool read_mailbox_5(void)
{
u8 header;
header = readb(PRCM_ACK_MB5_HEADER);
switch (header) {
case MB5H_I2C_READ:
memcpy_fromio(mb5_transfer.ack.value, PRCM_ACK_MB5_I2C_DATA, 4);
case MB5H_I2C_WRITE:
mb5_transfer.ack.header = header;
mb5_transfer.ack.status = readb(PRCM_ACK_MB5_RETURN_CODE);
complete(&mb5_transfer.work);
break;
default:
print_unknown_header_warning(5, header);
break;
}
writel(MBOX_BIT(5), PRCM_ARM_IT1_CLEAR);
return false;
}
static bool read_mailbox_6(void)
{
writel(MBOX_BIT(6), PRCM_ARM_IT1_CLEAR);
return false;
}
static bool read_mailbox_7(void)
{
writel(MBOX_BIT(7), PRCM_ARM_IT1_CLEAR);
return false;
}
static bool (* const read_mailbox[NUM_MB])(void) = {
read_mailbox_0,
read_mailbox_1,
read_mailbox_2,
read_mailbox_3,
read_mailbox_4,
read_mailbox_5,
read_mailbox_6,
read_mailbox_7
};
static irqreturn_t prcmu_irq_handler(int irq, void *data)
{
u32 bits;
u8 n;
irqreturn_t r;
bits = (readl(PRCM_ARM_IT1_VAL) & ALL_MBOX_BITS);
if (unlikely(!bits))
return IRQ_NONE;
r = IRQ_HANDLED;
for (n = 0; bits; n++) {
if (bits & MBOX_BIT(n)) {
bits -= MBOX_BIT(n);
if (read_mailbox[n]())
r = IRQ_WAKE_THREAD;
}
}
return r;
}
static irqreturn_t prcmu_irq_thread_fn(int irq, void *data)
{
ack_dbb_wakeup();
return IRQ_HANDLED;
}
void __init db5500_prcmu_early_init(void)
{
tcdm_base = __io_address(U5500_PRCMU_TCDM_BASE);
spin_lock_init(&mb0_transfer.lock);
mutex_init(&mb5_transfer.lock);
init_completion(&mb5_transfer.work);
}
/**
* prcmu_fw_init - arch init call for the Linux PRCMU fw init logic
*
*/
int __init db5500_prcmu_init(void)
{
int r = 0;
if (ux500_is_svp() || !cpu_is_u5500())
return -ENODEV;
/* Clean up the mailbox interrupts after pre-kernel code. */
writel(ALL_MBOX_BITS, PRCM_ARM_IT1_CLEAR);
r = request_threaded_irq(IRQ_DB5500_PRCMU1, prcmu_irq_handler,
prcmu_irq_thread_fn, 0, "prcmu", NULL);
if (r < 0) {
pr_err("prcmu: Failed to allocate IRQ_DB5500_PRCMU1.\n");
return -EBUSY;
}
return 0;
}
arch_initcall(db5500_prcmu_init);

45
include/linux/mfd/db5500-prcmu.h Normal file
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@ -0,0 +1,45 @@
/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
*
* U5500 PRCMU API.
*/
#ifndef __MACH_PRCMU_U5500_H
#define __MACH_PRCMU_U5500_H
#ifdef CONFIG_UX500_SOC_DB5500
void db5500_prcmu_early_init(void);
int db5500_prcmu_abb_read(u8 slave, u8 reg, u8 *value, u8 size);
int db5500_prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size);
#else /* !CONFIG_UX500_SOC_DB5500 */
static inline void db5500_prcmu_early_init(void)
{
}
static inline int db5500_prcmu_abb_read(u8 slave, u8 reg, u8 *value, u8 size)
{
return -ENOSYS;
}
static inline int db5500_prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size)
{
return -ENOSYS;
}
#endif /* CONFIG_UX500_SOC_DB5500 */
static inline int db5500_prcmu_config_abb_event_readout(u32 abb_events)
{
#ifdef CONFIG_MACH_U5500_SIMULATOR
return 0;
#else
return -1;
#endif
}
#endif /* __MACH_PRCMU_U5500_H */