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Message-Id: <1349451107-8009-3-git-send-email-lee.jones@linaro.org>
Date: Fri, 5 Oct 2012 16:31:38 +0100
From: Lee Jones <lee.jones@...aro.org>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: arnd@...db.de, linus.walleij@...ricsson.com,
Lee Jones <lee.jones@...aro.org>,
Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH 02/10] mfd: Provide the STMPE driver with its own IRQ domain
The STMPE driver is yet another IRQ controller which requires its
own IRQ domain. So, we provide it with one.
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
drivers/mfd/stmpe.c | 82 +++++++++++++++++++++++++++------------------
include/linux/mfd/stmpe.h | 2 ++
2 files changed, 52 insertions(+), 32 deletions(-)
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index ad13cb0..5c8d8f2 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/mfd/core.h>
@@ -757,7 +758,9 @@ static irqreturn_t stmpe_irq(int irq, void *data)
int i;
if (variant->id_val == STMPE801_ID) {
- handle_nested_irq(stmpe->irq_base);
+ int base = irq_create_mapping(stmpe->domain, 0);
+
+ handle_nested_irq(base);
return IRQ_HANDLED;
}
@@ -778,8 +781,9 @@ static irqreturn_t stmpe_irq(int irq, void *data)
while (status) {
int bit = __ffs(status);
int line = bank * 8 + bit;
+ int nestedirq = irq_create_mapping(stmpe->domain, line);
- handle_nested_irq(stmpe->irq_base + line);
+ handle_nested_irq(nestedirq);
status &= ~(1 << bit);
}
@@ -820,7 +824,7 @@ static void stmpe_irq_sync_unlock(struct irq_data *data)
static void stmpe_irq_mask(struct irq_data *data)
{
struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
- int offset = data->irq - stmpe->irq_base;
+ int offset = data->hwirq;
int regoffset = offset / 8;
int mask = 1 << (offset % 8);
@@ -830,7 +834,7 @@ static void stmpe_irq_mask(struct irq_data *data)
static void stmpe_irq_unmask(struct irq_data *data)
{
struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
- int offset = data->irq - stmpe->irq_base;
+ int offset = data->hwirq;
int regoffset = offset / 8;
int mask = 1 << (offset % 8);
@@ -845,43 +849,62 @@ static struct irq_chip stmpe_irq_chip = {
.irq_unmask = stmpe_irq_unmask,
};
-static int __devinit stmpe_irq_init(struct stmpe *stmpe)
+static int stmpe_irq_map(struct irq_domain *d, unsigned int virq,
+ irq_hw_number_t hwirq)
{
+ struct stmpe *stmpe = d->host_data;
struct irq_chip *chip = NULL;
- int num_irqs = stmpe->variant->num_irqs;
- int base = stmpe->irq_base;
- int irq;
if (stmpe->variant->id_val != STMPE801_ID)
chip = &stmpe_irq_chip;
- for (irq = base; irq < base + num_irqs; irq++) {
- irq_set_chip_data(irq, stmpe);
- irq_set_chip_and_handler(irq, chip, handle_edge_irq);
- irq_set_nested_thread(irq, 1);
+ irq_set_chip_data(virq, stmpe);
+ irq_set_chip_and_handler(virq, chip, handle_edge_irq);
+ irq_set_nested_thread(virq, 1);
#ifdef CONFIG_ARM
- set_irq_flags(irq, IRQF_VALID);
+ set_irq_flags(virq, IRQF_VALID);
#else
- irq_set_noprobe(irq);
+ irq_set_noprobe(virq);
#endif
- }
return 0;
}
-static void stmpe_irq_remove(struct stmpe *stmpe)
+static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq)
{
- int num_irqs = stmpe->variant->num_irqs;
- int base = stmpe->irq_base;
- int irq;
-
- for (irq = base; irq < base + num_irqs; irq++) {
#ifdef CONFIG_ARM
- set_irq_flags(irq, 0);
+ set_irq_flags(virq, 0);
#endif
- irq_set_chip_and_handler(irq, NULL, NULL);
- irq_set_chip_data(irq, NULL);
+ irq_set_chip_and_handler(virq, NULL, NULL);
+ irq_set_chip_data(virq, NULL);
+}
+
+static struct irq_domain_ops stmpe_irq_ops = {
+ .map = stmpe_irq_map,
+ .unmap = stmpe_irq_unmap,
+ .xlate = irq_domain_xlate_twocell,
+};
+
+static int __devinit stmpe_irq_init(struct stmpe *stmpe)
+{
+ int base = stmpe->irq_base;
+ int num_irqs = stmpe->variant->num_irqs;
+
+ if (base) {
+ stmpe->domain = irq_domain_add_legacy(
+ NULL, num_irqs, base, 0, &stmpe_irq_ops, stmpe);
+ }
+ else {
+ stmpe->domain = irq_domain_add_linear(
+ NULL, num_irqs, &stmpe_irq_ops, stmpe);
+ }
+
+ if (!stmpe->domain) {
+ dev_err(stmpe->dev, "Failed to create irqdomain\n");
+ return -ENOSYS;
}
+
+ return 0;
}
static int __devinit stmpe_chip_init(struct stmpe *stmpe)
@@ -954,7 +977,7 @@ static int __devinit stmpe_add_device(struct stmpe *stmpe,
struct mfd_cell *cell)
{
return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
- NULL, stmpe->irq_base, NULL);
+ NULL, stmpe->irq_base, stmpe->domain);
}
static int __devinit stmpe_devices_init(struct stmpe *stmpe)
@@ -1067,7 +1090,7 @@ int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum)
if (ret) {
dev_err(stmpe->dev, "failed to request IRQ: %d\n",
ret);
- goto out_removeirq;
+ goto free_gpio;
}
}
@@ -1083,9 +1106,6 @@ out_removedevs:
mfd_remove_devices(stmpe->dev);
if (stmpe->irq >= 0)
free_irq(stmpe->irq, stmpe);
-out_removeirq:
- if (stmpe->irq >= 0)
- stmpe_irq_remove(stmpe);
free_gpio:
if (pdata->irq_over_gpio)
gpio_free(pdata->irq_gpio);
@@ -1098,10 +1118,8 @@ int stmpe_remove(struct stmpe *stmpe)
{
mfd_remove_devices(stmpe->dev);
- if (stmpe->irq >= 0) {
+ if (stmpe->irq >= 0)
free_irq(stmpe->irq, stmpe);
- stmpe_irq_remove(stmpe);
- }
if (stmpe->pdata->irq_over_gpio)
gpio_free(stmpe->pdata->irq_gpio);
diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
index f8d5b4d..15dac79 100644
--- a/include/linux/mfd/stmpe.h
+++ b/include/linux/mfd/stmpe.h
@@ -62,6 +62,7 @@ struct stmpe_client_info;
* @lock: lock protecting I/O operations
* @irq_lock: IRQ bus lock
* @dev: device, mostly for dev_dbg()
+ * @irq_domain: IRQ domain
* @client: client - i2c or spi
* @ci: client specific information
* @partnum: part number
@@ -79,6 +80,7 @@ struct stmpe {
struct mutex lock;
struct mutex irq_lock;
struct device *dev;
+ struct irq_domain *domain;
void *client;
struct stmpe_client_info *ci;
enum stmpe_partnum partnum;
--
1.7.9.5
--
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