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

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Message-Id: <20240524182702.1317935-15-dave.stevenson@raspberrypi.com>
Date: Fri, 24 May 2024 19:26:58 +0100
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Vinod Koul <vkoul@...nel.org>,
	Maxime Ripard <mripard@...nel.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Vladimir Murzin <vladimir.murzin@....com>,
	Phil Elwell <phil@...pberrypi.com>,
	Stefan Wahren <wahrenst@....net>,
	Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc: devicetree@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-mmc@...r.kernel.org,
	linux-spi@...r.kernel.org,
	iommu@...ts.linux.dev,
	linux-sound@...r.kernel.org,
	Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: [PATCH 14/18] mmc: bcm2835: Use phys addresses for slave DMA config

From: Phil Elwell <phil@...pberrypi.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@...pberrypi.com>
Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.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