openwrt-xburst/package/broadcom-wl/patches/006-generic-dma-api.patch

From: George Kashperko <george@znau.edu.ua>

broadcom-wl driver bound to ssb device with ssb driver probe
have osh handle struct pdev pointer value initialized with
ssb_device pointer. Later on pdev is used with legacy pci
dma api as pci_dev thus causing oops sometimes.

The patch replaces legacy pci dma api and pass relevant
device struct pointer to avoid crashes.
Signed-off-by: George Kashperko <george@znau.edu.ua>
---
 driver/linux_osl.c |   28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)
--- a/driver/linux_osl.c
+++ b/driver/linux_osl.c
@@ -25,6 +25,9 @@
 #include <asm/paccess.h>
 #endif /* mips */
 #include <pcicfg.h>
+#ifdef CONFIG_SSB
+#include <linux/ssb/ssb.h>
+#endif
 
 #define PCI_CFG_RETRY 		10
 
@@ -364,12 +367,27 @@ osl_dma_consistent_align(void)
 	return (PAGE_SIZE);
 }
 
+static struct device *
+osl_get_dmadev(osl_t *osh)
+{
+#ifdef CONFIG_SSB
+	if (osh->bustype == SI_BUS) {
+		/* This can be SiliconBackplane emulated as pci with Broadcom or
+		 * ssb device. Less harmful is to check for pci_bus_type and if
+		 * no match then assume we got ssb */
+		if (((struct pci_dev *)osh->pdev)->dev.bus != &pci_bus_type)
+			return ((struct ssb_device *)osh->pdev)->dma_dev;
+	}
+#endif
+	return &((struct pci_dev *)osh->pdev)->dev;
+}
+
 void*
 osl_dma_alloc_consistent(osl_t *osh, uint size, ulong *pap)
 {
 	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
 
-	return (pci_alloc_consistent(osh->pdev, size, (dma_addr_t*)pap));
+	return (dma_alloc_coherent(osl_get_dmadev(osh), size, (dma_addr_t*)pap, GFP_ATOMIC));
 }
 
 void
@@ -377,7 +395,7 @@ osl_dma_free_consistent(osl_t *osh, void
 {
 	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
 
-	pci_free_consistent(osh->pdev, size, va, (dma_addr_t)pa);
+	dma_free_coherent(osl_get_dmadev(osh), size, va, (dma_addr_t)pa);
 }
 
 uint BCMFASTPATH
@@ -386,13 +404,13 @@ osl_dma_map(osl_t *osh, void *va, uint s
 	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
 
 	if (direction == DMA_TX)
-		return (pci_map_single(osh->pdev, va, size, PCI_DMA_TODEVICE));
+		return (dma_map_single(osl_get_dmadev(osh), va, size, PCI_DMA_TODEVICE));
 	else {
 #ifdef mips
 		dma_cache_inv((uint)va, size);
 		return (virt_to_phys(va));
 #else /* mips */
-		return (pci_map_single(osh->pdev, va, size, PCI_DMA_FROMDEVICE));
+		return (dma_map_single(osl_get_dmadev(osh), va, size, PCI_DMA_FROMDEVICE));
 #endif /* mips */
 	}
 }
@@ -404,7 +422,7 @@ osl_dma_unmap(osl_t *osh, uint pa, uint 
 
 	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
 	dir = (direction == DMA_TX)? PCI_DMA_TODEVICE: PCI_DMA_FROMDEVICE;
-	pci_unmap_single(osh->pdev, (uint32)pa, size, dir);
+	dma_unmap_single(osl_get_dmadev(osh), (uint32)pa, size, dir);
 }