diff options
Diffstat (limited to 'drivers/dma/tegra20-apb-dma.c')
| -rw-r--r-- | drivers/dma/tegra20-apb-dma.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index 3871f29e523d..01e316f73559 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -54,6 +54,7 @@ #define TEGRA_APBDMA_CSR_ONCE BIT(27) #define TEGRA_APBDMA_CSR_FLOW BIT(21) #define TEGRA_APBDMA_CSR_REQ_SEL_SHIFT 16 +#define TEGRA_APBDMA_CSR_REQ_SEL_MASK 0x1F #define TEGRA_APBDMA_CSR_WCOUNT_MASK 0xFFFC /* STATUS register */ @@ -114,6 +115,8 @@ /* Channel base address offset from APBDMA base address */ #define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000 +#define TEGRA_APBDMA_SLAVE_ID_INVALID (TEGRA_APBDMA_CSR_REQ_SEL_MASK + 1) + struct tegra_dma; /* @@ -353,8 +356,11 @@ static int tegra_dma_slave_config(struct dma_chan *dc, } memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig)); - if (!tdc->slave_id) + if (tdc->slave_id == TEGRA_APBDMA_SLAVE_ID_INVALID) { + if (sconfig->slave_id > TEGRA_APBDMA_CSR_REQ_SEL_MASK) + return -EINVAL; tdc->slave_id = sconfig->slave_id; + } tdc->config_init = true; return 0; } @@ -1236,7 +1242,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc) } pm_runtime_put(tdma->dev); - tdc->slave_id = 0; + tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID; } static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec, @@ -1246,6 +1252,11 @@ static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec, struct dma_chan *chan; struct tegra_dma_channel *tdc; + if (dma_spec->args[0] > TEGRA_APBDMA_CSR_REQ_SEL_MASK) { + dev_err(tdma->dev, "Invalid slave id: %d\n", dma_spec->args[0]); + return NULL; + } + chan = dma_get_any_slave_channel(&tdma->dma_dev); if (!chan) return NULL; @@ -1389,6 +1400,7 @@ static int tegra_dma_probe(struct platform_device *pdev) &tdma->dma_dev.channels); tdc->tdma = tdma; tdc->id = i; + tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID; tasklet_init(&tdc->tasklet, tegra_dma_tasklet, (unsigned long)tdc); |