[PATCH v4 01/11] ARM: omap: edma: add suspend suspend/resume hooks

Dave Gerlach
2014-07-11T02:57:06Z

From: Daniel Mack <zonque@gmail.com>

This patch makes the edma driver resume correctly after suspend. Tested
on an AM33xx platform with cyclic audio streams and omap_hsmmc.

All information can be reconstructed by already known runtime
information.

As we now use some functions that were previously only used from __init
context, annotations had to be dropped.

[nm@ti.com: added error handling for runtime + suspend_late/early_resume]
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Daniel Mack <zonque@gmail.com>
Tested-by: Joel Fernandes <joelf@ti.com>
Acked-by: Joel Fernandes <joelf@ti.com>
[d-gerlach@ti.com: updated to remove queue_tc_mapping use]
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
---
arch/arm/common/edma.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 84 insertions(+), 2 deletions(-)

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 485be42..8b1b9aa 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -244,6 +244,8 @@ struct edma {
/* list of channels with no even trigger; terminated by "-1" */
const s8 *noevent;

+ struct edma_soc_info *info;
+
/* The edma_inuse bit for each PaRAM slot is clear unless the
* channel is in use ... by ARM or DSP, for QDMA, or whatever.
*/
@@ -295,7 +297,7 @@ static void map_dmach_queue(unsigned ctlr, unsigned ch_no,
~(0x7 << bit), queue_no << bit);
}

-static void __init assign_priority_to_queue(unsigned ctlr, int queue_no,
+static void assign_priority_to_queue(unsigned ctlr, int queue_no,
int priority)
{
int bit = queue_no * 4;
@@ -314,7 +316,7 @@ static void __init assign_priority_to_queue(unsigned ctlr, int queue_no,
* included in that particular EDMA variant (Eg : dm646x)
*
*/
-static void __init map_dmach_param(unsigned ctlr)
+static void map_dmach_param(unsigned ctlr)
{
int i;
for (i = 0; i < EDMA_MAX_DMACH; i++)
@@ -1762,15 +1764,95 @@ static int edma_probe(struct platform_device *pdev)
edma_write_array2(j, EDMA_DRAE, i, 1, 0x0);
edma_write_array(j, EDMA_QRAE, i, 0x0);
}
+ edma_cc[j]->info = info[j];
arch_num_cc++;
}

return 0;
}

+static int edma_pm_suspend(struct device *dev)
+{
+ int j, r;
+
+ r = pm_runtime_get_sync(dev);
+ if (r < 0) {
+ dev_err(dev, "%s: get_sync returned %d\n", __func__, r);
+ return r;
+ }
+
+ for (j = 0; j < arch_num_cc; j++) {
+ struct edma *ecc = edma_cc[j];
+
+ disable_irq(ecc->irq_res_start);
+ disable_irq(ecc->irq_res_end);
+ }
+
+ pm_runtime_put_sync(dev);
+
+ return 0;
+}
+
+static int edma_pm_resume(struct device *dev)
+{
+ int i, j, r;
+
+ r = pm_runtime_get_sync(dev);
+ if (r < 0) {
+ dev_err(dev, "%s: get_sync returned %d\n", __func__, r);
+ return r;
+ }
+
+ for (j = 0; j < arch_num_cc; j++) {
+ struct edma *cc = edma_cc[j];
+
+ s8 (*queue_priority_mapping)[2];
+
+ queue_priority_mapping = cc->info->queue_priority_mapping;
+
+ /* Event queue priority mapping */
+ for (i = 0; queue_priority_mapping[i][0] != -1; i++)
+ assign_priority_to_queue(j,
+ queue_priority_mapping[i][0],
+ queue_priority_mapping[i][1]);
+
+ /*
+ * Map the channel to param entry if channel mapping logic
+ * exist
+ */
+ if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
+ map_dmach_param(j);
+
+ for (i = 0; i < cc->num_channels; i++) {
+ if (test_bit(i, cc->edma_inuse)) {
+ /* ensure access through shadow region 0 */
+ edma_or_array2(j, EDMA_DRAE, 0, i >> 5,
+ BIT(i & 0x1f));
+
+ setup_dma_interrupt(i,
+ cc->intr_data[i].callback,
+ cc->intr_data[i].data);
+ }
+ }
+
+ enable_irq(cc->irq_res_start);
+ enable_irq(cc->irq_res_end);
+ }
+
+ pm_runtime_put_sync(dev);
+
+ return 0;
+}
+
+static const struct dev_pm_ops edma_pm_ops = {
+ .suspend_late = edma_pm_suspend,
+ .resume_early = edma_pm_resume,
+};
+
static struct platform_driver edma_driver = {
.driver = {
.name = "edma",
+ .pm = &edma_pm_ops,
.of_match_table = edma_of_ids,
},
.probe = edma_probe,
--
1.9.0