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linux-next/drivers/dma/ipu/ipu_irq.c
Magnus Lilja adee40b265 dmaengine: ipu: Make sure the interrupt routine checks all interrupts.
Commit 3d8cc00073 ("dmaengine: ipu: Consolidate duplicated irq handlers")
consolidated the two interrupts routines into one, but the remaining
interrupt routine only checks the status of the error interrupts, not the
normal interrupts.

This patch fixes that problem (tested on i.MX31 PDK board).

Fixes: 3d8cc00073 ("dmaengine: ipu: Consolidate duplicated irq handlers")
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: <stable@vger.kernel.org> # 4.1.x
Signed-off-by: Magnus Lilja <lilja.magnus@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2017-01-02 10:48:44 +05:30

371 lines
8.9 KiB
C

/*
* Copyright (C) 2008
* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
*
* 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.
*/
#include <linux/init.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/dma/ipu-dma.h>
#include "ipu_intern.h"
/*
* Register read / write - shall be inlined by the compiler
*/
static u32 ipu_read_reg(struct ipu *ipu, unsigned long reg)
{
return __raw_readl(ipu->reg_ipu + reg);
}
static void ipu_write_reg(struct ipu *ipu, u32 value, unsigned long reg)
{
__raw_writel(value, ipu->reg_ipu + reg);
}
/*
* IPU IRQ chip driver
*/
#define IPU_IRQ_NR_FN_BANKS 3
#define IPU_IRQ_NR_ERR_BANKS 2
#define IPU_IRQ_NR_BANKS (IPU_IRQ_NR_FN_BANKS + IPU_IRQ_NR_ERR_BANKS)
struct ipu_irq_bank {
unsigned int control;
unsigned int status;
struct ipu *ipu;
};
static struct ipu_irq_bank irq_bank[IPU_IRQ_NR_BANKS] = {
/* 3 groups of functional interrupts */
{
.control = IPU_INT_CTRL_1,
.status = IPU_INT_STAT_1,
}, {
.control = IPU_INT_CTRL_2,
.status = IPU_INT_STAT_2,
}, {
.control = IPU_INT_CTRL_3,
.status = IPU_INT_STAT_3,
},
/* 2 groups of error interrupts */
{
.control = IPU_INT_CTRL_4,
.status = IPU_INT_STAT_4,
}, {
.control = IPU_INT_CTRL_5,
.status = IPU_INT_STAT_5,
},
};
struct ipu_irq_map {
unsigned int irq;
int source;
struct ipu_irq_bank *bank;
struct ipu *ipu;
};
static struct ipu_irq_map irq_map[CONFIG_MX3_IPU_IRQS];
/* Protects allocations from the above array of maps */
static DEFINE_MUTEX(map_lock);
/* Protects register accesses and individual mappings */
static DEFINE_RAW_SPINLOCK(bank_lock);
static struct ipu_irq_map *src2map(unsigned int src)
{
int i;
for (i = 0; i < CONFIG_MX3_IPU_IRQS; i++)
if (irq_map[i].source == src)
return irq_map + i;
return NULL;
}
static void ipu_irq_unmask(struct irq_data *d)
{
struct ipu_irq_map *map = irq_data_get_irq_chip_data(d);
struct ipu_irq_bank *bank;
uint32_t reg;
unsigned long lock_flags;
raw_spin_lock_irqsave(&bank_lock, lock_flags);
bank = map->bank;
if (!bank) {
raw_spin_unlock_irqrestore(&bank_lock, lock_flags);
pr_err("IPU: %s(%u) - unmapped!\n", __func__, d->irq);
return;
}
reg = ipu_read_reg(bank->ipu, bank->control);
reg |= (1UL << (map->source & 31));
ipu_write_reg(bank->ipu, reg, bank->control);
raw_spin_unlock_irqrestore(&bank_lock, lock_flags);
}
static void ipu_irq_mask(struct irq_data *d)
{
struct ipu_irq_map *map = irq_data_get_irq_chip_data(d);
struct ipu_irq_bank *bank;
uint32_t reg;
unsigned long lock_flags;
raw_spin_lock_irqsave(&bank_lock, lock_flags);
bank = map->bank;
if (!bank) {
raw_spin_unlock_irqrestore(&bank_lock, lock_flags);
pr_err("IPU: %s(%u) - unmapped!\n", __func__, d->irq);
return;
}
reg = ipu_read_reg(bank->ipu, bank->control);
reg &= ~(1UL << (map->source & 31));
ipu_write_reg(bank->ipu, reg, bank->control);
raw_spin_unlock_irqrestore(&bank_lock, lock_flags);
}
static void ipu_irq_ack(struct irq_data *d)
{
struct ipu_irq_map *map = irq_data_get_irq_chip_data(d);
struct ipu_irq_bank *bank;
unsigned long lock_flags;
raw_spin_lock_irqsave(&bank_lock, lock_flags);
bank = map->bank;
if (!bank) {
raw_spin_unlock_irqrestore(&bank_lock, lock_flags);
pr_err("IPU: %s(%u) - unmapped!\n", __func__, d->irq);
return;
}
ipu_write_reg(bank->ipu, 1UL << (map->source & 31), bank->status);
raw_spin_unlock_irqrestore(&bank_lock, lock_flags);
}
/**
* ipu_irq_status() - returns the current interrupt status of the specified IRQ.
* @irq: interrupt line to get status for.
* @return: true if the interrupt is pending/asserted or false if the
* interrupt is not pending.
*/
bool ipu_irq_status(unsigned int irq)
{
struct ipu_irq_map *map = irq_get_chip_data(irq);
struct ipu_irq_bank *bank;
unsigned long lock_flags;
bool ret;
raw_spin_lock_irqsave(&bank_lock, lock_flags);
bank = map->bank;
ret = bank && ipu_read_reg(bank->ipu, bank->status) &
(1UL << (map->source & 31));
raw_spin_unlock_irqrestore(&bank_lock, lock_flags);
return ret;
}
/**
* ipu_irq_map() - map an IPU interrupt source to an IRQ number
* @source: interrupt source bit position (see below)
* @return: mapped IRQ number or negative error code
*
* The source parameter has to be explained further. On i.MX31 IPU has 137 IRQ
* sources, they are broken down in 5 32-bit registers, like 32, 32, 24, 32, 17.
* However, the source argument of this function is not the sequence number of
* the possible IRQ, but rather its bit position. So, first interrupt in fourth
* register has source number 96, and not 88. This makes calculations easier,
* and also provides forward compatibility with any future IPU implementations
* with any interrupt bit assignments.
*/
int ipu_irq_map(unsigned int source)
{
int i, ret = -ENOMEM;
struct ipu_irq_map *map;
might_sleep();
mutex_lock(&map_lock);
map = src2map(source);
if (map) {
pr_err("IPU: Source %u already mapped to IRQ %u\n", source, map->irq);
ret = -EBUSY;
goto out;
}
for (i = 0; i < CONFIG_MX3_IPU_IRQS; i++) {
if (irq_map[i].source < 0) {
unsigned long lock_flags;
raw_spin_lock_irqsave(&bank_lock, lock_flags);
irq_map[i].source = source;
irq_map[i].bank = irq_bank + source / 32;
raw_spin_unlock_irqrestore(&bank_lock, lock_flags);
ret = irq_map[i].irq;
pr_debug("IPU: mapped source %u to IRQ %u\n",
source, ret);
break;
}
}
out:
mutex_unlock(&map_lock);
if (ret < 0)
pr_err("IPU: couldn't map source %u: %d\n", source, ret);
return ret;
}
/**
* ipu_irq_map() - map an IPU interrupt source to an IRQ number
* @source: interrupt source bit position (see ipu_irq_map())
* @return: 0 or negative error code
*/
int ipu_irq_unmap(unsigned int source)
{
int i, ret = -EINVAL;
might_sleep();
mutex_lock(&map_lock);
for (i = 0; i < CONFIG_MX3_IPU_IRQS; i++) {
if (irq_map[i].source == source) {
unsigned long lock_flags;
pr_debug("IPU: unmapped source %u from IRQ %u\n",
source, irq_map[i].irq);
raw_spin_lock_irqsave(&bank_lock, lock_flags);
irq_map[i].source = -EINVAL;
irq_map[i].bank = NULL;
raw_spin_unlock_irqrestore(&bank_lock, lock_flags);
ret = 0;
break;
}
}
mutex_unlock(&map_lock);
return ret;
}
/* Chained IRQ handler for IPU function and error interrupt */
static void ipu_irq_handler(struct irq_desc *desc)
{
struct ipu *ipu = irq_desc_get_handler_data(desc);
u32 status;
int i, line;
for (i = 0; i < IPU_IRQ_NR_BANKS; i++) {
struct ipu_irq_bank *bank = irq_bank + i;
raw_spin_lock(&bank_lock);
status = ipu_read_reg(ipu, bank->status);
/*
* Don't think we have to clear all interrupts here, they will
* be acked by ->handle_irq() (handle_level_irq). However, we
* might want to clear unhandled interrupts after the loop...
*/
status &= ipu_read_reg(ipu, bank->control);
raw_spin_unlock(&bank_lock);
while ((line = ffs(status))) {
struct ipu_irq_map *map;
unsigned int irq;
line--;
status &= ~(1UL << line);
raw_spin_lock(&bank_lock);
map = src2map(32 * i + line);
if (!map) {
raw_spin_unlock(&bank_lock);
pr_err("IPU: Interrupt on unmapped source %u bank %d\n",
line, i);
continue;
}
irq = map->irq;
raw_spin_unlock(&bank_lock);
generic_handle_irq(irq);
}
}
}
static struct irq_chip ipu_irq_chip = {
.name = "ipu_irq",
.irq_ack = ipu_irq_ack,
.irq_mask = ipu_irq_mask,
.irq_unmask = ipu_irq_unmask,
};
/* Install the IRQ handler */
int __init ipu_irq_attach_irq(struct ipu *ipu, struct platform_device *dev)
{
unsigned int irq, i;
int irq_base = irq_alloc_descs(-1, 0, CONFIG_MX3_IPU_IRQS,
numa_node_id());
if (irq_base < 0)
return irq_base;
for (i = 0; i < IPU_IRQ_NR_BANKS; i++)
irq_bank[i].ipu = ipu;
for (i = 0; i < CONFIG_MX3_IPU_IRQS; i++) {
int ret;
irq = irq_base + i;
ret = irq_set_chip(irq, &ipu_irq_chip);
if (ret < 0)
return ret;
ret = irq_set_chip_data(irq, irq_map + i);
if (ret < 0)
return ret;
irq_map[i].ipu = ipu;
irq_map[i].irq = irq;
irq_map[i].source = -EINVAL;
irq_set_handler(irq, handle_level_irq);
irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
}
irq_set_chained_handler_and_data(ipu->irq_fn, ipu_irq_handler, ipu);
irq_set_chained_handler_and_data(ipu->irq_err, ipu_irq_handler, ipu);
ipu->irq_base = irq_base;
return 0;
}
void ipu_irq_detach_irq(struct ipu *ipu, struct platform_device *dev)
{
unsigned int irq, irq_base;
irq_base = ipu->irq_base;
irq_set_chained_handler_and_data(ipu->irq_fn, NULL, NULL);
irq_set_chained_handler_and_data(ipu->irq_err, NULL, NULL);
for (irq = irq_base; irq < irq_base + CONFIG_MX3_IPU_IRQS; irq++) {
irq_set_status_flags(irq, IRQ_NOREQUEST);
irq_set_chip(irq, NULL);
irq_set_chip_data(irq, NULL);
}
}