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path: root/drivers/dma/tegra20-apb-dma.c
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Diffstat (limited to 'drivers/dma/tegra20-apb-dma.c')
-rw-r--r--drivers/dma/tegra20-apb-dma.c55
1 files changed, 49 insertions, 6 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index f6c018f1b453..fcee27eae1f6 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -63,6 +63,9 @@
#define TEGRA_APBDMA_STATUS_COUNT_SHIFT 2
#define TEGRA_APBDMA_STATUS_COUNT_MASK 0xFFFC
+#define TEGRA_APBDMA_CHAN_CSRE 0x00C
+#define TEGRA_APBDMA_CHAN_CSRE_PAUSE (1 << 31)
+
/* AHB memory address */
#define TEGRA_APBDMA_CHAN_AHBPTR 0x010
@@ -113,10 +116,12 @@ struct tegra_dma;
* tegra_dma_chip_data Tegra chip specific DMA data
* @nr_channels: Number of channels available in the controller.
* @max_dma_count: Maximum DMA transfer count supported by DMA controller.
+ * @support_channel_pause: Support channel wise pause of dma.
*/
struct tegra_dma_chip_data {
int nr_channels;
int max_dma_count;
+ bool support_channel_pause;
};
/* DMA channel registers */
@@ -355,6 +360,32 @@ static void tegra_dma_global_resume(struct tegra_dma_channel *tdc)
spin_unlock(&tdma->global_lock);
}
+static void tegra_dma_pause(struct tegra_dma_channel *tdc,
+ bool wait_for_burst_complete)
+{
+ struct tegra_dma *tdma = tdc->tdma;
+
+ if (tdma->chip_data->support_channel_pause) {
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE,
+ TEGRA_APBDMA_CHAN_CSRE_PAUSE);
+ if (wait_for_burst_complete)
+ udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
+ } else {
+ tegra_dma_global_pause(tdc, wait_for_burst_complete);
+ }
+}
+
+static void tegra_dma_resume(struct tegra_dma_channel *tdc)
+{
+ struct tegra_dma *tdma = tdc->tdma;
+
+ if (tdma->chip_data->support_channel_pause) {
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE, 0);
+ } else {
+ tegra_dma_global_resume(tdc);
+ }
+}
+
static void tegra_dma_stop(struct tegra_dma_channel *tdc)
{
u32 csr;
@@ -410,7 +441,7 @@ static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
* If there is already IEC status then interrupt handler need to
* load new configuration.
*/
- tegra_dma_global_pause(tdc, false);
+ tegra_dma_pause(tdc, false);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
/*
@@ -420,7 +451,7 @@ static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
dev_err(tdc2dev(tdc),
"Skipping new configuration as interrupt is pending\n");
- tegra_dma_global_resume(tdc);
+ tegra_dma_resume(tdc);
return;
}
@@ -431,7 +462,7 @@ static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
nsg_req->configured = true;
- tegra_dma_global_resume(tdc);
+ tegra_dma_resume(tdc);
}
static void tdc_start_head_req(struct tegra_dma_channel *tdc)
@@ -692,7 +723,7 @@ static void tegra_dma_terminate_all(struct dma_chan *dc)
goto skip_dma_stop;
/* Pause DMA before checking the queue status */
- tegra_dma_global_pause(tdc, true);
+ tegra_dma_pause(tdc, true);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
@@ -710,7 +741,7 @@ static void tegra_dma_terminate_all(struct dma_chan *dc)
sgreq->dma_desc->bytes_transferred +=
get_current_xferred_count(tdc, sgreq, status);
}
- tegra_dma_global_resume(tdc);
+ tegra_dma_resume(tdc);
skip_dma_stop:
tegra_dma_abort_all(tdc);
@@ -738,7 +769,6 @@ static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
ret = dma_cookie_status(dc, cookie, txstate);
if (ret == DMA_SUCCESS) {
- dma_set_residue(txstate, 0);
spin_unlock_irqrestore(&tdc->lock, flags);
return ret;
}
@@ -1180,6 +1210,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
static const struct tegra_dma_chip_data tegra20_dma_chip_data = {
.nr_channels = 16,
.max_dma_count = 1024UL * 64,
+ .support_channel_pause = false,
};
#if defined(CONFIG_OF)
@@ -1187,10 +1218,22 @@ static const struct tegra_dma_chip_data tegra20_dma_chip_data = {
static const struct tegra_dma_chip_data tegra30_dma_chip_data = {
.nr_channels = 32,
.max_dma_count = 1024UL * 64,
+ .support_channel_pause = false,
};
+/* Tegra114 specific DMA controller information */
+static const struct tegra_dma_chip_data tegra114_dma_chip_data = {
+ .nr_channels = 32,
+ .max_dma_count = 1024UL * 64,
+ .support_channel_pause = true,
+};
+
+
static const struct of_device_id tegra_dma_of_match[] = {
{
+ .compatible = "nvidia,tegra114-apbdma",
+ .data = &tegra114_dma_chip_data,
+ }, {
.compatible = "nvidia,tegra30-apbdma",
.data = &tegra30_dma_chip_data,
}, {