blob: 040e1260489a7960685427be807e93b37af3c16b [file] [log] [blame]
/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <asm/hardware/gic.h>
#include <linux/spinlock.h>
#include <mach/msm_iomap.h>
#include <mach/gpio.h>
#include "mpm.h"
/******************************************************************************
* Debug Definitions
*****************************************************************************/
enum {
MSM_MPM_DEBUG_NON_DETECTABLE_IRQ = BIT(0),
MSM_MPM_DEBUG_PENDING_IRQ = BIT(1),
MSM_MPM_DEBUG_WRITE = BIT(2),
MSM_MPM_DEBUG_NON_DETECTABLE_IRQ_IDLE = BIT(3),
};
static int msm_mpm_debug_mask = 1;
module_param_named(
debug_mask, msm_mpm_debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP
);
/******************************************************************************
* Request and Status Definitions
*****************************************************************************/
enum {
MSM_MPM_REQUEST_REG_ENABLE,
MSM_MPM_REQUEST_REG_DETECT_CTL,
MSM_MPM_REQUEST_REG_POLARITY,
MSM_MPM_REQUEST_REG_CLEAR,
};
enum {
MSM_MPM_STATUS_REG_PENDING,
};
/******************************************************************************
* IRQ Mapping Definitions
*****************************************************************************/
#define MSM_MPM_NR_APPS_IRQS (NR_MSM_IRQS + NR_GPIO_IRQS)
#define MSM_MPM_REG_WIDTH DIV_ROUND_UP(MSM_MPM_NR_MPM_IRQS, 32)
#define MSM_MPM_IRQ_INDEX(irq) (irq / 32)
#define MSM_MPM_IRQ_MASK(irq) BIT(irq % 32)
static uint8_t msm_mpm_irqs_a2m[MSM_MPM_NR_APPS_IRQS];
static DEFINE_SPINLOCK(msm_mpm_lock);
/*
* Note: the following two bitmaps only mark irqs that are _not_
* mappable to MPM.
*/
static DECLARE_BITMAP(msm_mpm_enabled_apps_irqs, MSM_MPM_NR_APPS_IRQS);
static DECLARE_BITMAP(msm_mpm_wake_apps_irqs, MSM_MPM_NR_APPS_IRQS);
static DECLARE_BITMAP(msm_mpm_gpio_irqs_mask, MSM_MPM_NR_APPS_IRQS);
static uint32_t msm_mpm_enabled_irq[MSM_MPM_REG_WIDTH];
static uint32_t msm_mpm_wake_irq[MSM_MPM_REG_WIDTH];
static uint32_t msm_mpm_detect_ctl[MSM_MPM_REG_WIDTH];
static uint32_t msm_mpm_polarity[MSM_MPM_REG_WIDTH];
/******************************************************************************
* Low Level Functions for Accessing MPM
*****************************************************************************/
static inline uint32_t msm_mpm_read(
unsigned int reg, unsigned int subreg_index)
{
unsigned int offset = reg * MSM_MPM_REG_WIDTH + subreg_index;
return __raw_readl(msm_mpm_dev_data.mpm_status_reg_base + offset * 4);
}
static inline void msm_mpm_write(
unsigned int reg, unsigned int subreg_index, uint32_t value)
{
unsigned int offset = reg * MSM_MPM_REG_WIDTH + subreg_index;
__raw_writel(value, msm_mpm_dev_data.mpm_request_reg_base + offset * 4);
if (MSM_MPM_DEBUG_WRITE & msm_mpm_debug_mask)
pr_info("%s: reg %u.%u: 0x%08x\n",
__func__, reg, subreg_index, value);
}
static inline void msm_mpm_send_interrupt(void)
{
__raw_writel(msm_mpm_dev_data.mpm_apps_ipc_val,
msm_mpm_dev_data.mpm_apps_ipc_reg);
/* Ensure the write is complete before returning. */
mb();
}
static irqreturn_t msm_mpm_irq(int irq, void *dev_id)
{
return IRQ_HANDLED;
}
/******************************************************************************
* MPM Access Functions
*****************************************************************************/
static void msm_mpm_set(bool wakeset)
{
uint32_t *irqs;
unsigned int reg;
int i;
irqs = wakeset ? msm_mpm_wake_irq : msm_mpm_enabled_irq;
for (i = 0; i < MSM_MPM_REG_WIDTH; i++) {
reg = MSM_MPM_REQUEST_REG_ENABLE;
msm_mpm_write(reg, i, irqs[i]);
reg = MSM_MPM_REQUEST_REG_DETECT_CTL;
msm_mpm_write(reg, i, msm_mpm_detect_ctl[i]);
reg = MSM_MPM_REQUEST_REG_POLARITY;
msm_mpm_write(reg, i, msm_mpm_polarity[i]);
reg = MSM_MPM_REQUEST_REG_CLEAR;
msm_mpm_write(reg, i, 0xffffffff);
}
/* Ensure that the set operation is complete before sending the
* interrupt
*/
mb();
msm_mpm_send_interrupt();
}
static void msm_mpm_clear(void)
{
int i;
for (i = 0; i < MSM_MPM_REG_WIDTH; i++) {
msm_mpm_write(MSM_MPM_REQUEST_REG_ENABLE, i, 0);
msm_mpm_write(MSM_MPM_REQUEST_REG_CLEAR, i, 0xffffffff);
}
/* Ensure the clear is complete before sending the interrupt */
mb();
msm_mpm_send_interrupt();
}
/******************************************************************************
* Interrupt Mapping Functions
*****************************************************************************/
static inline bool msm_mpm_is_valid_apps_irq(unsigned int irq)
{
return irq < ARRAY_SIZE(msm_mpm_irqs_a2m);
}
static inline uint8_t msm_mpm_get_irq_a2m(unsigned int irq)
{
return msm_mpm_irqs_a2m[irq];
}
static inline void msm_mpm_set_irq_a2m(unsigned int apps_irq,
unsigned int mpm_irq)
{
msm_mpm_irqs_a2m[apps_irq] = (uint8_t) mpm_irq;
}
static inline bool msm_mpm_is_valid_mpm_irq(unsigned int irq)
{
return irq < msm_mpm_dev_data.irqs_m2a_size;
}
static inline uint16_t msm_mpm_get_irq_m2a(unsigned int irq)
{
return msm_mpm_dev_data.irqs_m2a[irq];
}
static bool msm_mpm_bypass_apps_irq(unsigned int irq)
{
int i;
for (i = 0; i < msm_mpm_dev_data.bypassed_apps_irqs_size; i++)
if (irq == msm_mpm_dev_data.bypassed_apps_irqs[i])
return true;
return false;
}
static int msm_mpm_enable_irq_exclusive(
unsigned int irq, bool enable, bool wakeset)
{
uint32_t mpm_irq;
if (!msm_mpm_is_valid_apps_irq(irq))
return -EINVAL;
if (msm_mpm_bypass_apps_irq(irq))
return 0;
mpm_irq = msm_mpm_get_irq_a2m(irq);
if (mpm_irq) {
uint32_t *mpm_irq_masks = wakeset ?
msm_mpm_wake_irq : msm_mpm_enabled_irq;
uint32_t index = MSM_MPM_IRQ_INDEX(mpm_irq);
uint32_t mask = MSM_MPM_IRQ_MASK(mpm_irq);
if (enable)
mpm_irq_masks[index] |= mask;
else
mpm_irq_masks[index] &= ~mask;
} else {
unsigned long *apps_irq_bitmap = wakeset ?
msm_mpm_wake_apps_irqs : msm_mpm_enabled_apps_irqs;
if (enable)
__set_bit(irq, apps_irq_bitmap);
else
__clear_bit(irq, apps_irq_bitmap);
}
return 0;
}
static int msm_mpm_set_irq_type_exclusive(
unsigned int irq, unsigned int flow_type)
{
uint32_t mpm_irq;
if (!msm_mpm_is_valid_apps_irq(irq))
return -EINVAL;
if (msm_mpm_bypass_apps_irq(irq))
return 0;
mpm_irq = msm_mpm_get_irq_a2m(irq);
if (mpm_irq) {
uint32_t index = MSM_MPM_IRQ_INDEX(mpm_irq);
uint32_t mask = MSM_MPM_IRQ_MASK(mpm_irq);
if (flow_type & IRQ_TYPE_EDGE_BOTH)
msm_mpm_detect_ctl[index] |= mask;
else
msm_mpm_detect_ctl[index] &= ~mask;
if (flow_type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH))
msm_mpm_polarity[index] |= mask;
else
msm_mpm_polarity[index] &= ~mask;
}
return 0;
}
static int __msm_mpm_enable_irq(unsigned int irq, unsigned int enable)
{
unsigned long flags;
int rc;
spin_lock_irqsave(&msm_mpm_lock, flags);
rc = msm_mpm_enable_irq_exclusive(irq, (bool)enable, false);
spin_unlock_irqrestore(&msm_mpm_lock, flags);
return rc;
}
static void msm_mpm_enable_irq(struct irq_data *d)
{
__msm_mpm_enable_irq(d->irq, 1);
}
static void msm_mpm_disable_irq(struct irq_data *d)
{
__msm_mpm_enable_irq(d->irq, 0);
}
static int msm_mpm_set_irq_wake(struct irq_data *d, unsigned int on)
{
unsigned long flags;
int rc;
spin_lock_irqsave(&msm_mpm_lock, flags);
rc = msm_mpm_enable_irq_exclusive(d->irq, (bool)on, true);
spin_unlock_irqrestore(&msm_mpm_lock, flags);
return rc;
}
static int msm_mpm_set_irq_type(struct irq_data *d, unsigned int flow_type)
{
unsigned long flags;
int rc;
spin_lock_irqsave(&msm_mpm_lock, flags);
rc = msm_mpm_set_irq_type_exclusive(d->irq, flow_type);
spin_unlock_irqrestore(&msm_mpm_lock, flags);
return rc;
}
/******************************************************************************
* Public functions
*****************************************************************************/
int msm_mpm_enable_pin(enum msm_mpm_pin pin, unsigned int enable)
{
uint32_t index = MSM_MPM_IRQ_INDEX(pin);
uint32_t mask = MSM_MPM_IRQ_MASK(pin);
unsigned long flags;
spin_lock_irqsave(&msm_mpm_lock, flags);
if (enable)
msm_mpm_enabled_irq[index] |= mask;
else
msm_mpm_enabled_irq[index] &= ~mask;
spin_unlock_irqrestore(&msm_mpm_lock, flags);
return 0;
}
int msm_mpm_set_pin_wake(enum msm_mpm_pin pin, unsigned int on)
{
uint32_t index = MSM_MPM_IRQ_INDEX(pin);
uint32_t mask = MSM_MPM_IRQ_MASK(pin);
unsigned long flags;
spin_lock_irqsave(&msm_mpm_lock, flags);
if (on)
msm_mpm_wake_irq[index] |= mask;
else
msm_mpm_wake_irq[index] &= ~mask;
spin_unlock_irqrestore(&msm_mpm_lock, flags);
return 0;
}
int msm_mpm_set_pin_type(enum msm_mpm_pin pin, unsigned int flow_type)
{
uint32_t index = MSM_MPM_IRQ_INDEX(pin);
uint32_t mask = MSM_MPM_IRQ_MASK(pin);
unsigned long flags;
spin_lock_irqsave(&msm_mpm_lock, flags);
if (flow_type & IRQ_TYPE_EDGE_BOTH)
msm_mpm_detect_ctl[index] |= mask;
else
msm_mpm_detect_ctl[index] &= ~mask;
if (flow_type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH))
msm_mpm_polarity[index] |= mask;
else
msm_mpm_polarity[index] &= ~mask;
spin_unlock_irqrestore(&msm_mpm_lock, flags);
return 0;
}
bool msm_mpm_irqs_detectable(bool from_idle)
{
unsigned long *apps_irq_bitmap;
int debug_mask;
if (from_idle) {
apps_irq_bitmap = msm_mpm_enabled_apps_irqs;
debug_mask = msm_mpm_debug_mask &
MSM_MPM_DEBUG_NON_DETECTABLE_IRQ_IDLE;
} else {
apps_irq_bitmap = msm_mpm_wake_apps_irqs;
debug_mask = msm_mpm_debug_mask &
MSM_MPM_DEBUG_NON_DETECTABLE_IRQ;
}
if (debug_mask) {
static char buf[DIV_ROUND_UP(MSM_MPM_NR_APPS_IRQS, 32)*9+1];
bitmap_scnprintf(buf, sizeof(buf), apps_irq_bitmap,
MSM_MPM_NR_APPS_IRQS);
buf[sizeof(buf) - 1] = '\0';
pr_info("%s: cannot monitor %s", __func__, buf);
}
return (bool)__bitmap_empty(apps_irq_bitmap, MSM_MPM_NR_APPS_IRQS);
}
bool msm_mpm_gpio_irqs_detectable(bool from_idle)
{
unsigned long *apps_irq_bitmap = from_idle ?
msm_mpm_enabled_apps_irqs : msm_mpm_wake_apps_irqs;
return !__bitmap_intersects(msm_mpm_gpio_irqs_mask, apps_irq_bitmap,
MSM_MPM_NR_APPS_IRQS);
}
void msm_mpm_enter_sleep(bool from_idle)
{
msm_mpm_set(!from_idle);
}
void msm_mpm_exit_sleep(bool from_idle)
{
unsigned long pending;
int i;
int k;
for (i = 0; i < MSM_MPM_REG_WIDTH; i++) {
pending = msm_mpm_read(MSM_MPM_STATUS_REG_PENDING, i);
if (MSM_MPM_DEBUG_PENDING_IRQ & msm_mpm_debug_mask)
pr_info("%s: pending.%d: 0x%08lx", __func__,
i, pending);
k = find_first_bit(&pending, 32);
while (k < 32) {
unsigned int mpm_irq = 32 * i + k;
unsigned int apps_irq = msm_mpm_get_irq_m2a(mpm_irq);
struct irq_desc *desc = apps_irq ?
irq_to_desc(apps_irq) : NULL;
if (desc && !irqd_is_level_type(&desc->irq_data)) {
irq_set_pending(apps_irq);
if (from_idle)
check_irq_resend(desc, apps_irq);
}
k = find_next_bit(&pending, 32, k + 1);
}
}
msm_mpm_clear();
}
static int __init msm_mpm_early_init(void)
{
uint8_t mpm_irq;
uint16_t apps_irq;
for (mpm_irq = 0; msm_mpm_is_valid_mpm_irq(mpm_irq); mpm_irq++) {
apps_irq = msm_mpm_get_irq_m2a(mpm_irq);
if (apps_irq && msm_mpm_is_valid_apps_irq(apps_irq))
msm_mpm_set_irq_a2m(apps_irq, mpm_irq);
}
return 0;
}
core_initcall(msm_mpm_early_init);
void msm_mpm_irq_extn_init(void)
{
gic_arch_extn.irq_mask = msm_mpm_disable_irq;
gic_arch_extn.irq_unmask = msm_mpm_enable_irq;
gic_arch_extn.irq_disable = msm_mpm_disable_irq;
gic_arch_extn.irq_set_type = msm_mpm_set_irq_type;
gic_arch_extn.irq_set_wake = msm_mpm_set_irq_wake;
msm_gpio_irq_extn.irq_mask = msm_mpm_disable_irq;
msm_gpio_irq_extn.irq_unmask = msm_mpm_enable_irq;
msm_gpio_irq_extn.irq_disable = msm_mpm_disable_irq;
msm_gpio_irq_extn.irq_set_type = msm_mpm_set_irq_type;
msm_gpio_irq_extn.irq_set_wake = msm_mpm_set_irq_wake;
bitmap_set(msm_mpm_gpio_irqs_mask, NR_MSM_IRQS, NR_GPIO_IRQS);
}
static int __init msm_mpm_init(void)
{
unsigned int irq = msm_mpm_dev_data.mpm_ipc_irq;
int rc;
rc = request_irq(irq, msm_mpm_irq,
IRQF_TRIGGER_RISING, "mpm_drv", msm_mpm_irq);
if (rc) {
pr_err("%s: failed to request irq %u: %d\n",
__func__, irq, rc);
goto init_bail;
}
rc = irq_set_irq_wake(irq, 1);
if (rc) {
pr_err("%s: failed to set wakeup irq %u: %d\n",
__func__, irq, rc);
goto init_free_bail;
}
return 0;
init_free_bail:
free_irq(irq, msm_mpm_irq);
init_bail:
return rc;
}
device_initcall(msm_mpm_init);