dmaengine: sun6i: Move number of pchans/vchans/request to device struct

Preparatory patch: If the same compatible is used for different SoCs which
have a common register layout, but different number of channels, the
channel count can no longer be stored in the config. Store it in the
device structure instead.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 16 insertions, 10 deletions

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index 55c915f490e0..f27b126dd6cd 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -188,6 +188,9 @@ struct sun6i_dma_dev {
         struct sun6i_pchan      *pchans;
         struct sun6i_vchan      *vchans;
         const struct sun6i_dma_config *cfg;
+        u32                     num_pchans;
+        u32                     num_vchans;
+        u32                     max_request;
 };
 
 static struct device *chan2dev(struct dma_chan *chan)
@@ -434,7 +437,6 @@ static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
 static void sun6i_dma_tasklet(unsigned long data)
 {
         struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)data;
-        const struct sun6i_dma_config *cfg = sdev->cfg;
         struct sun6i_vchan *vchan;
         struct sun6i_pchan *pchan;
         unsigned int pchan_alloc = 0;
@@ -462,7 +464,7 @@ static void sun6i_dma_tasklet(unsigned long data)
         }
 
         spin_lock_irq(&sdev->lock);
-        for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
+        for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
                 pchan = &sdev->pchans[pchan_idx];
 
                 if (pchan->vchan || list_empty(&sdev->pending))
@@ -483,7 +485,7 @@ static void sun6i_dma_tasklet(unsigned long data)
         }
         spin_unlock_irq(&sdev->lock);
 
-        for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
+        for (pchan_idx = 0; pchan_idx < sdev->num_pchans; pchan_idx++) {
                 if (!(pchan_alloc & BIT(pchan_idx)))
                         continue;
 
@@ -505,7 +507,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
         int i, j, ret = IRQ_NONE;
         u32 status;
 
-        for (i = 0; i < sdev->cfg->nr_max_channels / DMA_IRQ_CHAN_NR; i++) {
+        for (i = 0; i < sdev->num_pchans / DMA_IRQ_CHAN_NR; i++) {
                 status = readl(sdev->base + DMA_IRQ_STAT(i));
                 if (!status)
                         continue;
@@ -985,7 +987,7 @@ static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec,
         struct dma_chan *chan;
         u8 port = dma_spec->args[0];
 
-        if (port > sdev->cfg->nr_max_requests)
+        if (port > sdev->max_request)
                 return NULL;
 
         chan = dma_get_any_slave_channel(&sdev->slave);
@@ -1018,7 +1020,7 @@ static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
 {
         int i;
 
-        for (i = 0; i < sdev->cfg->nr_max_vchans; i++) {
+        for (i = 0; i < sdev->num_vchans; i++) {
                 struct sun6i_vchan *vchan = &sdev->vchans[i];
 
                 list_del(&vchan->vc.chan.device_node);
@@ -1222,26 +1224,30 @@ static int sun6i_dma_probe(struct platform_device *pdev)
         sdc->slave.residue_granularity          = DMA_RESIDUE_GRANULARITY_BURST;
         sdc->slave.dev = &pdev->dev;
 
-        sdc->pchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_channels,
+        sdc->num_pchans = sdc->cfg->nr_max_channels;
+        sdc->num_vchans = sdc->cfg->nr_max_vchans;
+        sdc->max_request = sdc->cfg->nr_max_requests;
+
+        sdc->pchans = devm_kcalloc(&pdev->dev, sdc->num_pchans,
                                    sizeof(struct sun6i_pchan), GFP_KERNEL);
         if (!sdc->pchans)
                 return -ENOMEM;
 
-        sdc->vchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_vchans,
+        sdc->vchans = devm_kcalloc(&pdev->dev, sdc->num_vchans,
                                    sizeof(struct sun6i_vchan), GFP_KERNEL);
         if (!sdc->vchans)
                 return -ENOMEM;
 
         tasklet_init(&sdc->task, sun6i_dma_tasklet, (unsigned long)sdc);
 
-        for (i = 0; i < sdc->cfg->nr_max_channels; i++) {
+        for (i = 0; i < sdc->num_pchans; i++) {
                 struct sun6i_pchan *pchan = &sdc->pchans[i];
 
                 pchan->idx = i;
                 pchan->base = sdc->base + 0x100 + i * 0x40;
         }
 
-        for (i = 0; i < sdc->cfg->nr_max_vchans; i++) {
+        for (i = 0; i < sdc->num_vchans; i++) {
                 struct sun6i_vchan *vchan = &sdc->vchans[i];
 
                 INIT_LIST_HEAD(&vchan->node);