mmc: dw_mmc: Add fifo address property

The FIFO address may break default address assumption of 0x100
(version < 0x240A) and 0x200(version >= 0x240A) in current driver.
The new property is introduced to override fifo address via DT
node information.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/dw_mmc.c

@@ -2976,6 +2976,8 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
 
 	of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
 
+	of_property_read_u32(np, "data-addr", &host->data_addr_override);
+
 	if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
 		pdata->bus_hz = clock_frequency;
 
@@ -3179,7 +3181,9 @@ int dw_mci_probe(struct dw_mci *host)
 	host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
 	dev_info(host->dev, "Version ID is %04x\n", host->verid);
 
-	if (host->verid < DW_MMC_240A)
+	if (host->data_addr_override)
+		host->fifo_reg = host->regs + host->data_addr_override;
+	else if (host->verid < DW_MMC_240A)
 		host->fifo_reg = host->regs + DATA_OFFSET;
 	else
 		host->fifo_reg = host->regs + DATA_240A_OFFSET;

drivers/mmc/host/dw_mmc.h

@@ -114,6 +114,7 @@ struct dw_mci_dma_slave {
  * @ciu_clk: Pointer to card interface unit clock instance.
  * @slot: Slots sharing this MMC controller.
  * @fifo_depth: depth of FIFO.
+ * @data_addr_override: override fifo reg offset with this value.
  * @data_shift: log2 of FIFO item size.
  * @part_buf_start: Start index in part_buf.
  * @part_buf_count: Bytes of partial data in part_buf.
@@ -161,6 +162,7 @@ struct dw_mci {
 	spinlock_t		irq_lock;
 	void __iomem		*regs;
 	void __iomem		*fifo_reg;
+	u32			data_addr_override;
 
 	struct scatterlist	*sg;
 	struct sg_mapping_iter	sg_miter;