Linux-libre 4.2-gnu

1 files changed, 72 insertions, 8 deletions

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 167dbaf65..249445c8a 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -22,6 +22,9 @@
 
 #include "virt-dma.h"
 
+#define OMAP_SDMA_REQUESTS	127
+#define OMAP_SDMA_CHANNELS	32
+
 struct omap_dmadev {
 	struct dma_device ddev;
 	spinlock_t lock;
@@ -31,9 +34,10 @@ struct omap_dmadev {
 	const struct omap_dma_reg *reg_map;
 	struct omap_system_dma_plat_info *plat;
 	bool legacy;
+	unsigned dma_requests;
 	spinlock_t irq_lock;
 	uint32_t irq_enable_mask;
-	struct omap_chan *lch_map[32];
+	struct omap_chan *lch_map[OMAP_SDMA_CHANNELS];
 };
 
 struct omap_chan {
@@ -362,7 +366,7 @@ static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d,
 	struct omap_sg *sg = d->sg + idx;
 	unsigned cxsa, cxei, cxfi;
 
-	if (d->dir == DMA_DEV_TO_MEM) {
+	if (d->dir == DMA_DEV_TO_MEM || d->dir == DMA_MEM_TO_MEM) {
 		cxsa = CDSA;
 		cxei = CDEI;
 		cxfi = CDFI;
@@ -408,7 +412,7 @@ static void omap_dma_start_desc(struct omap_chan *c)
 	if (dma_omap1())
 		omap_dma_chan_write(c, CCR2, d->ccr >> 16);
 
-	if (d->dir == DMA_DEV_TO_MEM) {
+	if (d->dir == DMA_DEV_TO_MEM || d->dir == DMA_MEM_TO_MEM) {
 		cxsa = CSSA;
 		cxei = CSEI;
 		cxfi = CSFI;
@@ -589,6 +593,7 @@ static void omap_dma_free_chan_resources(struct dma_chan *chan)
 	omap_free_dma(c->dma_ch);
 
 	dev_dbg(od->ddev.dev, "freeing channel for %u\n", c->dma_sig);
+	c->dma_sig = 0;
 }
 
 static size_t omap_dma_sg_size(struct omap_sg *sg)
@@ -948,6 +953,51 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
 	return vchan_tx_prep(&c->vc, &d->vd, flags);
 }
 
+static struct dma_async_tx_descriptor *omap_dma_prep_dma_memcpy(
+	struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
+	size_t len, unsigned long tx_flags)
+{
+	struct omap_chan *c = to_omap_dma_chan(chan);
+	struct omap_desc *d;
+	uint8_t data_type;
+
+	d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC);
+	if (!d)
+		return NULL;
+
+	data_type = __ffs((src | dest | len));
+	if (data_type > CSDP_DATA_TYPE_32)
+		data_type = CSDP_DATA_TYPE_32;
+
+	d->dir = DMA_MEM_TO_MEM;
+	d->dev_addr = src;
+	d->fi = 0;
+	d->es = data_type;
+	d->sg[0].en = len / BIT(data_type);
+	d->sg[0].fn = 1;
+	d->sg[0].addr = dest;
+	d->sglen = 1;
+	d->ccr = c->ccr;
+	d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_POSTINC;
+
+	d->cicr = CICR_DROP_IE;
+	if (tx_flags & DMA_PREP_INTERRUPT)
+		d->cicr |= CICR_FRAME_IE;
+
+	d->csdp = data_type;
+
+	if (dma_omap1()) {
+		d->cicr |= CICR_TOUT_IE;
+		d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_EMIFF;
+	} else {
+		d->csdp |= CSDP_DST_PACKED | CSDP_SRC_PACKED;
+		d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE;
+		d->csdp |= CSDP_DST_BURST_64 | CSDP_SRC_BURST_64;
+	}
+
+	return vchan_tx_prep(&c->vc, &d->vd, tx_flags);
+}
+
 static int omap_dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
 {
 	struct omap_chan *c = to_omap_dma_chan(chan);
@@ -1037,7 +1087,7 @@ static int omap_dma_resume(struct dma_chan *chan)
 	return 0;
 }
 
-static int omap_dma_chan_init(struct omap_dmadev *od, int dma_sig)
+static int omap_dma_chan_init(struct omap_dmadev *od)
 {
 	struct omap_chan *c;
 
@@ -1046,7 +1096,6 @@ static int omap_dma_chan_init(struct omap_dmadev *od, int dma_sig)
 		return -ENOMEM;
 
 	c->reg_map = od->reg_map;
-	c->dma_sig = dma_sig;
 	c->vc.desc_free = omap_dma_desc_free;
 	vchan_init(&c->vc, &od->ddev);
 	INIT_LIST_HEAD(&c->node);
@@ -1094,12 +1143,14 @@ static int omap_dma_probe(struct platform_device *pdev)
 
 	dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
 	dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask);
+	dma_cap_set(DMA_MEMCPY, od->ddev.cap_mask);
 	od->ddev.device_alloc_chan_resources = omap_dma_alloc_chan_resources;
 	od->ddev.device_free_chan_resources = omap_dma_free_chan_resources;
 	od->ddev.device_tx_status = omap_dma_tx_status;
 	od->ddev.device_issue_pending = omap_dma_issue_pending;
 	od->ddev.device_prep_slave_sg = omap_dma_prep_slave_sg;
 	od->ddev.device_prep_dma_cyclic = omap_dma_prep_dma_cyclic;
+	od->ddev.device_prep_dma_memcpy = omap_dma_prep_dma_memcpy;
 	od->ddev.device_config = omap_dma_slave_config;
 	od->ddev.device_pause = omap_dma_pause;
 	od->ddev.device_resume = omap_dma_resume;
@@ -1116,8 +1167,17 @@ static int omap_dma_probe(struct platform_device *pdev)
 
 	tasklet_init(&od->task, omap_dma_sched, (unsigned long)od);
 
-	for (i = 0; i < 127; i++) {
-		rc = omap_dma_chan_init(od, i);
+	od->dma_requests = OMAP_SDMA_REQUESTS;
+	if (pdev->dev.of_node && of_property_read_u32(pdev->dev.of_node,
+						      "dma-requests",
+						      &od->dma_requests)) {
+		dev_info(&pdev->dev,
+			 "Missing dma-requests property, using %u.\n",
+			 OMAP_SDMA_REQUESTS);
+	}
+
+	for (i = 0; i < OMAP_SDMA_CHANNELS; i++) {
+		rc = omap_dma_chan_init(od);
 		if (rc) {
 			omap_dma_free(od);
 			return rc;
@@ -1208,10 +1268,14 @@ static struct platform_driver omap_dma_driver = {
 bool omap_dma_filter_fn(struct dma_chan *chan, void *param)
 {
 	if (chan->device->dev->driver == &omap_dma_driver.driver) {
+		struct omap_dmadev *od = to_omap_dma_dev(chan->device);
 		struct omap_chan *c = to_omap_dma_chan(chan);
 		unsigned req = *(unsigned *)param;
 
-		return req == c->dma_sig;
+		if (req <= od->dma_requests) {
+			c->dma_sig = req;
+			return true;
+		}
 	}
 	return false;
 }