linux-kernel - [PATCH] fsldma: Support 40 bit DMA addresses where capable

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Message-ID: <2025042122-bizarre-ibex-b7ed42@boujee-and-buff>
Date: Mon, 21 Apr 2025 22:49:49 -0400
From: Ben Collins <bcollins@...nel.org>
To: dmaengine@...r.kernel.org
Cc: Zhang Wei <zw@...kernel.org>, Vinod Koul <vkoul@...nel.org>, 
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] fsldma: Support 40 bit DMA addresses where capable

On 64-bit QorIQ platforms like T4240, the CPU supports 40-bit addressing
and memory configurations > 64GiB. The fsldma driver is limiting itself
to only 64GiB in all Elo configurations.

Setup fsldma driver to make use of the full 40-bit addressing space,
specifically on the e5500 and e6500 CPUs.

Signed-off-by: Ben Collins <bcollins@...nel.org>
Cc: Zhang Wei <zw@...kernel.org>
Cc: Vinod Koul <vkoul@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: dmaengine@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/dma/fsldma.c | 2 +-
 drivers/dma/fsldma.h | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index b5e7d18b97669..8c01963ad47d8 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -1254,7 +1254,7 @@ static int fsldma_of_probe(struct platform_device *op)
 	fdev->common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 	fdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
 
-	dma_set_mask(&(op->dev), DMA_BIT_MASK(36));
+	dma_set_mask(&(op->dev), DMA_BIT_MASK(ELO_MAX_PHYS_BITS));
 
 	platform_set_drvdata(op, fdev);
 
diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
index 308bed0a560ac..1e7bd37208412 100644
--- a/drivers/dma/fsldma.h
+++ b/drivers/dma/fsldma.h
@@ -13,6 +13,13 @@
 #include <linux/dmapool.h>
 #include <linux/dmaengine.h>
 
+/* Physical addressing capability */
+#if defined(CONFIG_E6500_CPU) || defined(CONFIG_E5500_CPU)
+#define ELO_MAX_PHYS_BITS	40
+#else
+#define ELO_MAX_PHYS_BITS	36
+#endif
+
 /* Define data structures needed by Freescale
  * MPC8540 and MPC8349 DMA controller.
  */
-- 
2.49.0


-- 
 Ben Collins
 https://libjwt.io
 https://github.com/benmcollins
 --
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