[PATCH v3 19/24] dmaengine: edma: Simplify the interrupt handling
Peter Ujfalusi
peter.ujfalusi at ti.com
Tue Sep 22 02:54:30 PDT 2015
With the merger of the arch/arm/common/edma.c code into the dmaengine
driver, there is no longer need to have per channel callback/data storage
for interrupt events.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
---
drivers/dma/edma.c | 447 ++++++++++++++++++++++++-----------------------------
1 file changed, 204 insertions(+), 243 deletions(-)
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index d872efed0760..03f411cc900b 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -154,12 +154,6 @@ struct edmacc_param {
#define TCCHEN BIT(22)
#define ITCCHEN BIT(23)
-/*ch_status paramater of callback function possible values*/
-#define EDMA_DMA_COMPLETE 1
-#define EDMA_DMA_CC_ERROR 2
-#define EDMA_DMA_TC1_ERROR 3
-#define EDMA_DMA_TC2_ERROR 4
-
struct edma_pset {
u32 len;
dma_addr_t addr;
@@ -243,12 +237,6 @@ struct edma_cc {
*/
unsigned long *edma_unused;
- struct dma_interrupt_data {
- void (*callback)(unsigned channel, unsigned short ch_status,
- void *data);
- void *data;
- } *intr_data;
-
struct dma_device dma_slave;
struct edma_chan *slave_chans;
int dummy_slot;
@@ -464,24 +452,18 @@ static int prepare_unused_channel_list(struct device *dev, void *data)
return 0;
}
-static void edma_setup_interrupt(struct edma_cc *ecc, unsigned lch,
- void (*callback)(unsigned channel, u16 ch_status, void *data),
- void *data)
+static void edma_setup_interrupt(struct edma_cc *ecc, unsigned lch, bool enable)
{
lch = EDMA_CHAN_SLOT(lch);
- if (!callback)
- edma_shadow0_write_array(ecc, SH_IECR, lch >> 5,
- BIT(lch & 0x1f));
-
- ecc->intr_data[lch].callback = callback;
- ecc->intr_data[lch].data = data;
-
- if (callback) {
+ if (enable) {
edma_shadow0_write_array(ecc, SH_ICR, lch >> 5,
BIT(lch & 0x1f));
edma_shadow0_write_array(ecc, SH_IESR, lch >> 5,
BIT(lch & 0x1f));
+ } else {
+ edma_shadow0_write_array(ecc, SH_IECR, lch >> 5,
+ BIT(lch & 0x1f));
}
}
@@ -774,8 +756,6 @@ static void edma_clean_channel(struct edma_cc *ecc, unsigned channel)
* edma_alloc_channel - allocate DMA channel and paired parameter RAM
* @ecc: pointer to edma_cc struct
* @channel: specific channel to allocate; negative for "any unmapped channel"
- * @callback: optional; to be issued on DMA completion or errors
- * @data: passed to callback
* @eventq_no: an EVENTQ_* constant, used to choose which Transfer
* Controller (TC) executes requests using this channel. Use
* EVENTQ_DEFAULT unless you really need a high priority queue.
@@ -802,9 +782,7 @@ static void edma_clean_channel(struct edma_cc *ecc, unsigned channel)
* Returns the number of the channel, else negative errno.
*/
static int edma_alloc_channel(struct edma_cc *ecc, int channel,
- void (*callback)(unsigned channel, u16 ch_status, void *data),
- void *data,
- enum dma_event_q eventq_no)
+ enum dma_event_q eventq_no)
{
unsigned done = 0;
int ret = 0;
@@ -860,9 +838,7 @@ static int edma_alloc_channel(struct edma_cc *ecc, int channel,
edma_stop(ecc, EDMA_CTLR_CHAN(ecc->id, channel));
edma_write_slot(ecc, channel, &dummy_paramset);
- if (callback)
- edma_setup_interrupt(ecc, EDMA_CTLR_CHAN(ecc->id, channel),
- callback, data);
+ edma_setup_interrupt(ecc, EDMA_CTLR_CHAN(ecc->id, channel), true);
edma_map_dmach_to_queue(ecc, channel, eventq_no);
@@ -895,7 +871,7 @@ static void edma_free_channel(struct edma_cc *ecc, unsigned channel)
if (channel >= ecc->num_channels)
return;
- edma_setup_interrupt(ecc, channel, NULL, NULL);
+ edma_setup_interrupt(ecc, channel, false);
/* REVISIT should probably take out of shadow region 0 */
edma_write_slot(ecc, channel, &dummy_paramset);
@@ -925,146 +901,6 @@ static void edma_assign_channel_eventq(struct edma_cc *ecc, unsigned channel,
edma_map_dmach_to_queue(ecc, channel, eventq_no);
}
-/* eDMA interrupt handler */
-static irqreturn_t dma_irq_handler(int irq, void *data)
-{
- struct edma_cc *ecc = data;
- int ctlr;
- u32 sh_ier;
- u32 sh_ipr;
- u32 bank;
-
- ctlr = ecc->id;
- if (ctlr < 0)
- return IRQ_NONE;
-
- dev_dbg(ecc->dev, "dma_irq_handler\n");
-
- sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 0);
- if (!sh_ipr) {
- sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 1);
- if (!sh_ipr)
- return IRQ_NONE;
- sh_ier = edma_shadow0_read_array(ecc, SH_IER, 1);
- bank = 1;
- } else {
- sh_ier = edma_shadow0_read_array(ecc, SH_IER, 0);
- bank = 0;
- }
-
- do {
- u32 slot;
- u32 channel;
-
- dev_dbg(ecc->dev, "IPR%d %08x\n", bank, sh_ipr);
-
- slot = __ffs(sh_ipr);
- sh_ipr &= ~(BIT(slot));
-
- if (sh_ier & BIT(slot)) {
- channel = (bank << 5) | slot;
- /* Clear the corresponding IPR bits */
- edma_shadow0_write_array(ecc, SH_ICR, bank, BIT(slot));
- if (ecc->intr_data[channel].callback)
- ecc->intr_data[channel].callback(
- EDMA_CTLR_CHAN(ctlr, channel),
- EDMA_DMA_COMPLETE,
- ecc->intr_data[channel].data);
- }
- } while (sh_ipr);
-
- edma_shadow0_write(ecc, SH_IEVAL, 1);
- return IRQ_HANDLED;
-}
-
-/* eDMA error interrupt handler */
-static irqreturn_t dma_ccerr_handler(int irq, void *data)
-{
- struct edma_cc *ecc = data;
- int i;
- int ctlr;
- unsigned int cnt = 0;
-
- ctlr = ecc->id;
- if (ctlr < 0)
- return IRQ_NONE;
-
- dev_dbg(ecc->dev, "dma_ccerr_handler\n");
-
- if ((edma_read_array(ecc, EDMA_EMR, 0) == 0) &&
- (edma_read_array(ecc, EDMA_EMR, 1) == 0) &&
- (edma_read(ecc, EDMA_QEMR) == 0) &&
- (edma_read(ecc, EDMA_CCERR) == 0))
- return IRQ_NONE;
-
- while (1) {
- int j = -1;
- if (edma_read_array(ecc, EDMA_EMR, 0))
- j = 0;
- else if (edma_read_array(ecc, EDMA_EMR, 1))
- j = 1;
- if (j >= 0) {
- dev_dbg(ecc->dev, "EMR%d %08x\n", j,
- edma_read_array(ecc, EDMA_EMR, j));
- for (i = 0; i < 32; i++) {
- int k = (j << 5) + i;
- if (edma_read_array(ecc, EDMA_EMR, j) &
- BIT(i)) {
- /* Clear the corresponding EMR bits */
- edma_write_array(ecc, EDMA_EMCR, j,
- BIT(i));
- /* Clear any SER */
- edma_shadow0_write_array(ecc, SH_SECR,
- j, BIT(i));
- if (ecc->intr_data[k].callback) {
- ecc->intr_data[k].callback(
- EDMA_CTLR_CHAN(ctlr, k),
- EDMA_DMA_CC_ERROR,
- ecc->intr_data[k].data);
- }
- }
- }
- } else if (edma_read(ecc, EDMA_QEMR)) {
- dev_dbg(ecc->dev, "QEMR %02x\n",
- edma_read(ecc, EDMA_QEMR));
- for (i = 0; i < 8; i++) {
- if (edma_read(ecc, EDMA_QEMR) & BIT(i)) {
- /* Clear the corresponding IPR bits */
- edma_write(ecc, EDMA_QEMCR, BIT(i));
- edma_shadow0_write(ecc, SH_QSECR,
- BIT(i));
-
- /* NOTE: not reported!! */
- }
- }
- } else if (edma_read(ecc, EDMA_CCERR)) {
- dev_dbg(ecc->dev, "CCERR %08x\n",
- edma_read(ecc, EDMA_CCERR));
- /* FIXME: CCERR.BIT(16) ignored! much better
- * to just write CCERRCLR with CCERR value...
- */
- for (i = 0; i < 8; i++) {
- if (edma_read(ecc, EDMA_CCERR) & BIT(i)) {
- /* Clear the corresponding IPR bits */
- edma_write(ecc, EDMA_CCERRCLR, BIT(i));
-
- /* NOTE: not reported!! */
- }
- }
- }
- if ((edma_read_array(ecc, EDMA_EMR, 0) == 0) &&
- (edma_read_array(ecc, EDMA_EMR, 1) == 0) &&
- (edma_read(ecc, EDMA_QEMR) == 0) &&
- (edma_read(ecc, EDMA_CCERR) == 0))
- break;
- cnt++;
- if (cnt > 10)
- break;
- }
- edma_write(ecc, EDMA_EEVAL, 1);
- return IRQ_HANDLED;
-}
-
static inline struct edma_cc *to_edma_cc(struct dma_device *d)
{
return container_of(d, struct edma_cc, dma_slave);
@@ -1646,81 +1482,213 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
}
-static void edma_callback(unsigned ch_num, u16 ch_status, void *data)
+static void edma_completion_handler(struct edma_chan *echan)
{
- struct edma_chan *echan = data;
struct edma_cc *ecc = echan->ecc;
struct device *dev = echan->vchan.chan.device->dev;
- struct edma_desc *edesc;
- struct edmacc_param p;
+ struct edma_desc *edesc = echan->edesc;
- edesc = echan->edesc;
+ if (!edesc)
+ return;
spin_lock(&echan->vchan.lock);
- switch (ch_status) {
- case EDMA_DMA_COMPLETE:
- if (edesc) {
- if (edesc->cyclic) {
- vchan_cyclic_callback(&edesc->vdesc);
- goto out;
- } else if (edesc->processed == edesc->pset_nr) {
- dev_dbg(dev,
- "Transfer completed on channel %d\n",
- ch_num);
- edesc->residue = 0;
- edma_stop(ecc, echan->ch_num);
- vchan_cookie_complete(&edesc->vdesc);
- echan->edesc = NULL;
- } else {
- dev_dbg(dev,
- "Sub transfer completed on channel %d\n",
- ch_num);
-
- edma_pause(ecc, echan->ch_num);
-
- /* Update statistics for tx_status */
- edesc->residue -= edesc->sg_len;
- edesc->residue_stat = edesc->residue;
- edesc->processed_stat = edesc->processed;
- }
- edma_execute(echan);
+ if (edesc->cyclic) {
+ vchan_cyclic_callback(&edesc->vdesc);
+ spin_unlock(&echan->vchan.lock);
+ return;
+ } else if (edesc->processed == edesc->pset_nr) {
+ dev_dbg(dev, "Transfer completed on channel %d\n",
+ echan->ch_num);
+ edesc->residue = 0;
+ edma_stop(ecc, echan->ch_num);
+ vchan_cookie_complete(&edesc->vdesc);
+ echan->edesc = NULL;
+ } else {
+ dev_dbg(dev, "Sub transfer completed on channel %d\n",
+ echan->ch_num);
+
+ edma_pause(ecc, echan->ch_num);
+
+ /* Update statistics for tx_status */
+ edesc->residue -= edesc->sg_len;
+ edesc->residue_stat = edesc->residue;
+ edesc->processed_stat = edesc->processed;
+ }
+ edma_execute(echan);
+
+ spin_unlock(&echan->vchan.lock);
+}
+
+/* eDMA interrupt handler */
+static irqreturn_t dma_irq_handler(int irq, void *data)
+{
+ struct edma_cc *ecc = data;
+ int ctlr;
+ u32 sh_ier;
+ u32 sh_ipr;
+ u32 bank;
+
+ ctlr = ecc->id;
+ if (ctlr < 0)
+ return IRQ_NONE;
+
+ dev_dbg(ecc->dev, "dma_irq_handler\n");
+
+ sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 0);
+ if (!sh_ipr) {
+ sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 1);
+ if (!sh_ipr)
+ return IRQ_NONE;
+ sh_ier = edma_shadow0_read_array(ecc, SH_IER, 1);
+ bank = 1;
+ } else {
+ sh_ier = edma_shadow0_read_array(ecc, SH_IER, 0);
+ bank = 0;
+ }
+
+ do {
+ u32 slot;
+ u32 channel;
+
+ dev_dbg(ecc->dev, "IPR%d %08x\n", bank, sh_ipr);
+
+ slot = __ffs(sh_ipr);
+ sh_ipr &= ~(BIT(slot));
+
+ if (sh_ier & BIT(slot)) {
+ channel = (bank << 5) | slot;
+ /* Clear the corresponding IPR bits */
+ edma_shadow0_write_array(ecc, SH_ICR, bank, BIT(slot));
+ edma_completion_handler(&ecc->slave_chans[channel]);
}
- break;
- case EDMA_DMA_CC_ERROR:
- edma_read_slot(ecc, echan->slot[0], &p);
+ } while (sh_ipr);
+
+ edma_shadow0_write(ecc, SH_IEVAL, 1);
+ return IRQ_HANDLED;
+}
+
+static void edma_error_handler(struct edma_chan *echan)
+{
+ struct edma_cc *ecc = echan->ecc;
+ struct device *dev = echan->vchan.chan.device->dev;
+ struct edmacc_param p;
+
+ if (!echan->edesc)
+ return;
+
+ spin_lock(&echan->vchan.lock);
+ edma_read_slot(ecc, echan->slot[0], &p);
+ /*
+ * Issue later based on missed flag which will be sure
+ * to happen as:
+ * (1) we finished transmitting an intermediate slot and
+ * edma_execute is coming up.
+ * (2) or we finished current transfer and issue will
+ * call edma_execute.
+ *
+ * Important note: issuing can be dangerous here and
+ * lead to some nasty recursion when we are in a NULL
+ * slot. So we avoid doing so and set the missed flag.
+ */
+ if (p.a_b_cnt == 0 && p.ccnt == 0) {
+ dev_dbg(dev, "Error on null slot, setting miss\n");
+ echan->missed = 1;
+ } else {
/*
- * Issue later based on missed flag which will be sure
- * to happen as:
- * (1) we finished transmitting an intermediate slot and
- * edma_execute is coming up.
- * (2) or we finished current transfer and issue will
- * call edma_execute.
- *
- * Important note: issuing can be dangerous here and
- * lead to some nasty recursion when we are in a NULL
- * slot. So we avoid doing so and set the missed flag.
+ * The slot is already programmed but the event got
+ * missed, so its safe to issue it here.
*/
- if (p.a_b_cnt == 0 && p.ccnt == 0) {
- dev_dbg(dev, "Error on null slot, setting miss\n");
- echan->missed = 1;
- } else {
- /*
- * The slot is already programmed but the event got
- * missed, so its safe to issue it here.
+ dev_dbg(dev, "Missed event, TRIGGERING\n");
+ edma_clean_channel(ecc, echan->ch_num);
+ edma_stop(ecc, echan->ch_num);
+ edma_start(ecc, echan->ch_num);
+ edma_trigger_channel(ecc, echan->ch_num);
+ }
+ spin_unlock(&echan->vchan.lock);
+}
+
+/* eDMA error interrupt handler */
+static irqreturn_t dma_ccerr_handler(int irq, void *data)
+{
+ struct edma_cc *ecc = data;
+ int i;
+ int ctlr;
+ unsigned int cnt = 0;
+
+ ctlr = ecc->id;
+ if (ctlr < 0)
+ return IRQ_NONE;
+
+ dev_dbg(ecc->dev, "dma_ccerr_handler\n");
+
+ if ((edma_read_array(ecc, EDMA_EMR, 0) == 0) &&
+ (edma_read_array(ecc, EDMA_EMR, 1) == 0) &&
+ (edma_read(ecc, EDMA_QEMR) == 0) &&
+ (edma_read(ecc, EDMA_CCERR) == 0))
+ return IRQ_NONE;
+
+ while (1) {
+ int j = -1;
+ if (edma_read_array(ecc, EDMA_EMR, 0))
+ j = 0;
+ else if (edma_read_array(ecc, EDMA_EMR, 1))
+ j = 1;
+ if (j >= 0) {
+ dev_dbg(ecc->dev, "EMR%d %08x\n", j,
+ edma_read_array(ecc, EDMA_EMR, j));
+ for (i = 0; i < 32; i++) {
+ int k = (j << 5) + i;
+ if (edma_read_array(ecc, EDMA_EMR, j) &
+ BIT(i)) {
+ /* Clear the corresponding EMR bits */
+ edma_write_array(ecc, EDMA_EMCR, j,
+ BIT(i));
+ /* Clear any SER */
+ edma_shadow0_write_array(ecc, SH_SECR,
+ j, BIT(i));
+ edma_error_handler(&ecc->slave_chans[k]);
+ }
+ }
+ } else if (edma_read(ecc, EDMA_QEMR)) {
+ dev_dbg(ecc->dev, "QEMR %02x\n",
+ edma_read(ecc, EDMA_QEMR));
+ for (i = 0; i < 8; i++) {
+ if (edma_read(ecc, EDMA_QEMR) & BIT(i)) {
+ /* Clear the corresponding IPR bits */
+ edma_write(ecc, EDMA_QEMCR, BIT(i));
+ edma_shadow0_write(ecc, SH_QSECR,
+ BIT(i));
+
+ /* NOTE: not reported!! */
+ }
+ }
+ } else if (edma_read(ecc, EDMA_CCERR)) {
+ dev_dbg(ecc->dev, "CCERR %08x\n",
+ edma_read(ecc, EDMA_CCERR));
+ /* FIXME: CCERR.BIT(16) ignored! much better
+ * to just write CCERRCLR with CCERR value...
*/
- dev_dbg(dev, "Missed event, TRIGGERING\n");
- edma_clean_channel(ecc, echan->ch_num);
- edma_stop(ecc, echan->ch_num);
- edma_start(ecc, echan->ch_num);
- edma_trigger_channel(ecc, echan->ch_num);
+ for (i = 0; i < 8; i++) {
+ if (edma_read(ecc, EDMA_CCERR) & BIT(i)) {
+ /* Clear the corresponding IPR bits */
+ edma_write(ecc, EDMA_CCERRCLR, BIT(i));
+
+ /* NOTE: not reported!! */
+ }
+ }
}
- break;
- default:
- break;
+ if ((edma_read_array(ecc, EDMA_EMR, 0) == 0) &&
+ (edma_read_array(ecc, EDMA_EMR, 1) == 0) &&
+ (edma_read(ecc, EDMA_QEMR) == 0) &&
+ (edma_read(ecc, EDMA_CCERR) == 0))
+ break;
+ cnt++;
+ if (cnt > 10)
+ break;
}
-out:
- spin_unlock(&echan->vchan.lock);
+ edma_write(ecc, EDMA_EEVAL, 1);
+ return IRQ_HANDLED;
}
/* Alloc channel resources */
@@ -1732,8 +1700,7 @@ static int edma_alloc_chan_resources(struct dma_chan *chan)
int a_ch_num;
LIST_HEAD(descs);
- a_ch_num = edma_alloc_channel(echan->ecc, echan->ch_num,
- edma_callback, echan, EVENTQ_DEFAULT);
+ a_ch_num = edma_alloc_channel(echan->ecc, echan->ch_num, EVENTQ_DEFAULT);
if (a_ch_num < 0) {
ret = -ENODEV;
@@ -2154,11 +2121,6 @@ static int edma_probe(struct platform_device *pdev)
if (!ecc->slave_chans)
return -ENOMEM;
- ecc->intr_data = devm_kcalloc(dev, ecc->num_channels,
- sizeof(*ecc->intr_data), GFP_KERNEL);
- if (!ecc->intr_data)
- return -ENOMEM;
-
ecc->edma_unused = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_channels),
sizeof(unsigned long), GFP_KERNEL);
if (!ecc->edma_unused)
@@ -2329,8 +2291,7 @@ static int edma_pm_resume(struct device *dev)
BIT(i & 0x1f));
edma_setup_interrupt(ecc, EDMA_CTLR_CHAN(ecc->id, i),
- ecc->intr_data[i].callback,
- ecc->intr_data[i].data);
+ true);
}
}
--
2.5.2
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