[PATCH 2/2] staging: drm/imx: convert IPU irq driver to irq_domain_add_linear
Philipp Zabel
p.zabel at pengutronix.de
Fri Jun 21 04:27:39 EDT 2013
The IPU has a lot of interrupts. Instead of allocating descs for all
of them, register a linear irq domain and create mappings as needed.
This was listed in the TODO as a prerequisite to move the IPU driver
out of staging.
Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
---
drivers/staging/imx-drm/TODO | 1 -
drivers/staging/imx-drm/ipu-v3/ipu-common.c | 66 +++++++++++++++++++----------
drivers/staging/imx-drm/ipu-v3/ipu-prv.h | 2 +-
3 files changed, 44 insertions(+), 25 deletions(-)
diff --git a/drivers/staging/imx-drm/TODO b/drivers/staging/imx-drm/TODO
index 123acbe..f806415 100644
--- a/drivers/staging/imx-drm/TODO
+++ b/drivers/staging/imx-drm/TODO
@@ -6,7 +6,6 @@ TODO:
- Factor out more code to common helper functions
- decide where to put the base driver. It is not specific to a subsystem
and would be used by DRM/KMS and media/V4L2
-- convert irq driver to irq_domain_add_linear
Missing features (not necessarily for moving out of staging):
diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-common.c b/drivers/staging/imx-drm/ipu-v3/ipu-common.c
index 0127601..1a7b59e 100644
--- a/drivers/staging/imx-drm/ipu-v3/ipu-common.c
+++ b/drivers/staging/imx-drm/ipu-v3/ipu-common.c
@@ -27,6 +27,7 @@
#include <linux/list.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
#include <linux/of_device.h>
#include "imx-ipu-v3.h"
@@ -799,16 +800,18 @@ err_di_0:
static void ipu_irq_handle(struct ipu_soc *ipu, const int *regs, int num_regs)
{
unsigned long status;
- int i, bit, irq_base;
+ int i, bit, irq;
for (i = 0; i < num_regs; i++) {
status = ipu_cm_read(ipu, IPU_INT_STAT(regs[i]));
status &= ipu_cm_read(ipu, IPU_INT_CTRL(regs[i]));
- irq_base = ipu->irq_start + regs[i] * 32;
- for_each_set_bit(bit, &status, 32)
- generic_handle_irq(irq_base + bit);
+ for_each_set_bit(bit, &status, 32) {
+ irq = irq_linear_revmap(ipu->domain, regs[i] * 32 + bit);
+ if (irq)
+ generic_handle_irq(irq);
+ }
}
}
@@ -841,7 +844,7 @@ static void ipu_err_irq_handler(unsigned int irq, struct irq_desc *desc)
static void ipu_ack_irq(struct irq_data *d)
{
struct ipu_soc *ipu = irq_data_get_irq_chip_data(d);
- unsigned int irq = d->irq - ipu->irq_start;
+ irq_hw_number_t irq = d->hwirq;
ipu_cm_write(ipu, 1 << (irq % 32), IPU_INT_STAT(irq / 32));
}
@@ -849,7 +852,7 @@ static void ipu_ack_irq(struct irq_data *d)
static void ipu_unmask_irq(struct irq_data *d)
{
struct ipu_soc *ipu = irq_data_get_irq_chip_data(d);
- unsigned int irq = d->irq - ipu->irq_start;
+ irq_hw_number_t irq = d->hwirq;
unsigned long flags;
u32 reg;
@@ -865,7 +868,7 @@ static void ipu_unmask_irq(struct irq_data *d)
static void ipu_mask_irq(struct irq_data *d)
{
struct ipu_soc *ipu = irq_data_get_irq_chip_data(d);
- unsigned int irq = d->irq - ipu->irq_start;
+ irq_hw_number_t irq = d->hwirq;
unsigned long flags;
u32 reg;
@@ -888,7 +891,12 @@ static struct irq_chip ipu_irq_chip = {
int ipu_idmac_channel_irq(struct ipu_soc *ipu, struct ipuv3_channel *channel,
enum ipu_channel_irq irq_type)
{
- return ipu->irq_start + irq_type + channel->num;
+ int irq = irq_linear_revmap(ipu->domain, irq_type + channel->num);
+
+ if (!irq)
+ irq = irq_create_mapping(ipu->domain, irq_type + channel->num);
+
+ return irq;
}
EXPORT_SYMBOL_GPL(ipu_idmac_channel_irq);
@@ -975,18 +983,30 @@ err_register:
return ret;
}
-static int ipu_irq_init(struct ipu_soc *ipu)
+static int ipu_irq_map(struct irq_domain *h, unsigned int irq,
+ irq_hw_number_t hw)
{
- int i;
+ struct ipu_soc *ipu = h->host_data;
+
+ irq_set_chip_and_handler(irq, &ipu_irq_chip, handle_level_irq);
+ set_irq_flags(irq, IRQF_VALID);
+ irq_set_chip_data(irq, ipu);
+
+ return 0;
+}
- ipu->irq_start = irq_alloc_descs(-1, 0, IPU_NUM_IRQS, 0);
- if (ipu->irq_start < 0)
- return ipu->irq_start;
+const struct irq_domain_ops ipu_irq_domain_ops = {
+ .map = ipu_irq_map,
+ .xlate = irq_domain_xlate_onecell,
+};
- for (i = ipu->irq_start; i < ipu->irq_start + IPU_NUM_IRQS; i++) {
- irq_set_chip_and_handler(i, &ipu_irq_chip, handle_level_irq);
- set_irq_flags(i, IRQF_VALID);
- irq_set_chip_data(i, ipu);
+static int ipu_irq_init(struct ipu_soc *ipu)
+{
+ ipu->domain = irq_domain_add_linear(ipu->dev->of_node, IPU_NUM_IRQS,
+ &ipu_irq_domain_ops, ipu);
+ if (!ipu->domain) {
+ dev_err(ipu->dev, "failed to add irq domain\n");
+ return -ENODEV;
}
irq_set_chained_handler(ipu->irq_sync, ipu_irq_handler);
@@ -999,20 +1019,20 @@ static int ipu_irq_init(struct ipu_soc *ipu)
static void ipu_irq_exit(struct ipu_soc *ipu)
{
- int i;
+ int i, irq;
irq_set_chained_handler(ipu->irq_err, NULL);
irq_set_handler_data(ipu->irq_err, NULL);
irq_set_chained_handler(ipu->irq_sync, NULL);
irq_set_handler_data(ipu->irq_sync, NULL);
- for (i = ipu->irq_start; i < ipu->irq_start + IPU_NUM_IRQS; i++) {
- set_irq_flags(i, 0);
- irq_set_chip(i, NULL);
- irq_set_chip_data(i, NULL);
+ for (i = 0; i < IPU_NUM_IRQS; i++) {
+ irq = irq_linear_revmap(ipu->domain, i);
+ if (irq)
+ irq_dispose_mapping(irq);
}
- irq_free_descs(ipu->irq_start, IPU_NUM_IRQS);
+ irq_domain_remove(ipu->domain);
}
static int ipu_probe(struct platform_device *pdev)
diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-prv.h b/drivers/staging/imx-drm/ipu-v3/ipu-prv.h
index 12d7eaf..4df0050 100644
--- a/drivers/staging/imx-drm/ipu-v3/ipu-prv.h
+++ b/drivers/staging/imx-drm/ipu-v3/ipu-prv.h
@@ -170,9 +170,9 @@ struct ipu_soc {
struct ipuv3_channel channel[64];
- int irq_start;
int irq_sync;
int irq_err;
+ struct irq_domain *domain;
struct ipu_dc_priv *dc_priv;
struct ipu_dp_priv *dp_priv;
--
1.8.3.1
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