[PATCH 14/18] mmc: bcm2835: Use phys addresses for slave DMA config

Dave Stevenson
2024-05-24T18:28:02Z

From: Phil Elwell <phil@raspberrypi.com>

Contrary to what struct snd_dmaengine_dai_dma_data suggests, the
configuration of addresses of DMA slave interfaces should be done in
CPU physical addresses.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
drivers/mmc/host/bcm2835.c | 17 +++--------------
1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 35d8fdea668b..746a60fac0f0 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -38,7 +38,6 @@
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
-#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
@@ -1347,8 +1346,8 @@ static int bcm2835_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct clk *clk;
struct bcm2835_host *host;
+ struct resource *iomem;
struct mmc_host *mmc;
- const __be32 *regaddr_p;
int ret;

dev_dbg(dev, "%s\n", __func__);
@@ -1361,23 +1360,13 @@ static int bcm2835_probe(struct platform_device *pdev)
host->pdev = pdev;
spin_lock_init(&host->lock);

- host->ioaddr = devm_platform_ioremap_resource(pdev, 0);
+ host->ioaddr = devm_platform_get_and_ioremap_resource(pdev, 0, &iomem);
if (IS_ERR(host->ioaddr)) {
ret = PTR_ERR(host->ioaddr);
goto err;
}

- /* Parse OF address directly to get the physical address for
- * DMA to our registers.
- */
- regaddr_p = of_get_address(pdev->dev.of_node, 0, NULL, NULL);
- if (!regaddr_p) {
- dev_err(dev, "Can't get phys address\n");
- ret = -EINVAL;
- goto err;
- }
-
- host->phys_addr = be32_to_cpup(regaddr_p);
+ host->phys_addr = iomem->start;

host->dma_chan = NULL;
host->dma_desc = NULL;
--
2.34.1