zorro: Set up z->dev.dma_mask for the DMA API

[ Upstream commit 55496d3fe2acd1a365c43cbd613a20ecd4d74395 ]

The generic DMA API uses dev->dma_mask to check the DMA addressable
memory bitmask, and warns if no mask is set or even allocated.

Set z->dev.dma_coherent_mask on Zorro bus scan, and make z->dev.dma_mask
to point to z->dev.dma_coherent_mask so device drivers that need DMA have
everything set up to avoid warnings from dma_alloc_coherent(). Drivers can
still use dma_set_mask_and_coherent() to explicitly set their DMA bit mask.

Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>
[geert: Handle Zorro II with 24-bit address space]
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/zorro/zorro.c b/drivers/zorro/zorro.c
index cc1b1ac..4772847 100644 (file)
--- a/drivers/zorro/zorro.c
+++ b/drivers/zorro/zorro.c
@@ -16,6 +16,7 @@
 #include <linux/bitops.h>
 #include <linux/string.h>
 #include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
 #include <linux/slab.h>
 
 #include <asm/byteorder.h>
@@ -185,6 +186,17 @@ static int __init amiga_zorro_probe(struct platform_device *pdev)
                z->dev.parent = &bus->dev;
                z->dev.bus = &zorro_bus_type;
                z->dev.id = i;
+               switch (z->rom.er_Type & ERT_TYPEMASK) {
+               case ERT_ZORROIII:
+                       z->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+                       break;
+
+               case ERT_ZORROII:
+               default:
+                       z->dev.coherent_dma_mask = DMA_BIT_MASK(24);
+                       break;
+               }
+               z->dev.dma_mask = &z->dev.coherent_dma_mask;
        }
 
        /* ... then register them */