dmaengine: tegra210-adma: check for adma max page

Have additional check for max channel page during the probe
to cover if any offset overshoot happens due to wrong DT
configuration.

Fixes: 68811c9 ("dmaengine: tegra210-adma: Support channel page")
Cc: [email protected]
Signed-off-by: Mohan Kumar D <[email protected]>
Reviewed-by: Jon Hunter <[email protected]>
Acked-by: Thierry Reding <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: mkumard

drivers/dma/tegra210-adma.c

@@ -83,7 +83,9 @@ struct tegra_adma;
  * @nr_channels: Number of DMA channels available.
  * @ch_fifo_size_mask: Mask for FIFO size field.
  * @sreq_index_offset: Slave channel index offset.
+ * @max_page: Maximum ADMA Channel Page.
  * @has_outstanding_reqs: If DMA channel can have outstanding requests.
+ * @set_global_pg_config: Global page programming.
  */
 struct tegra_adma_chip_data {
 	unsigned int (*adma_get_burst_config)(unsigned int burst_size);
@@ -99,6 +101,7 @@ struct tegra_adma_chip_data {
 	unsigned int nr_channels;
 	unsigned int ch_fifo_size_mask;
 	unsigned int sreq_index_offset;
+	unsigned int max_page;
 	bool has_outstanding_reqs;
 	void (*set_global_pg_config)(struct tegra_adma *tdma);
 };
@@ -854,6 +857,7 @@ static const struct tegra_adma_chip_data tegra210_chip_data = {
 	.nr_channels		= 22,
 	.ch_fifo_size_mask	= 0xf,
 	.sreq_index_offset	= 2,
+	.max_page		= 0,
 	.has_outstanding_reqs	= false,
 	.set_global_pg_config	= NULL,
 };
@@ -871,6 +875,7 @@ static const struct tegra_adma_chip_data tegra186_chip_data = {
 	.nr_channels		= 32,
 	.ch_fifo_size_mask	= 0x1f,
 	.sreq_index_offset	= 4,
+	.max_page		= 4,
 	.has_outstanding_reqs	= true,
 	.set_global_pg_config	= tegra186_adma_global_page_config,
 };
@@ -921,7 +926,7 @@ static int tegra_adma_probe(struct platform_device *pdev)
 			page_offset = res_page->start - res_base->start;
 			page_no = div_u64(page_offset, cdata->ch_base_offset);
 
-			if (WARN_ON(page_no == 0))
+			if (WARN_ON(page_no == 0 || page_no > cdata->max_page))
 				return -EINVAL;
 
 			tdma->ch_page_no = lower_32_bits(page_no) - 1;