casting between dma_addr_t and a pointer is generally tricky,
as they might not be the same size and almost never point into
the same address space. With 32-bit ARM systems and LPAE, we
get this warning for the vme_fake driver that stores a pointer
in a dma_addr_t variable:
drivers/vme/bridges/vme_fake.c: In function 'fake_slave_set':
drivers/vme/bridges/vme_fake.c:204:29: error: assignment makes pointer from
integer without a cast [-Werror=int-conversion]
To make this clearer while fixing the warning, I'm adding
a set of helper functions for the type conversion.
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
drivers/vme/bridges/vme_fake.c | 26 ++++++++++++++++++--------
1 file changed, 18 insertions(+), 8 deletions(-)
diff --git a/drivers/vme/bridges/vme_fake.c b/drivers/vme/bridges/vme_fake.c
index 7ef298b289f4..ebf35d305321 100644
--- a/drivers/vme/bridges/vme_fake.c
+++ b/drivers/vme/bridges/vme_fake.c
@@ -48,7 +48,7 @@ struct fake_slave_window {
int enabled;
unsigned long long vme_base;
unsigned long long size;
- dma_addr_t buf_base;
+ void *buf_base;
u32 aspace;
u32 cycle;
};
@@ -114,6 +114,16 @@ static void fake_irq_set(struct vme_bridge *fake_bridge,
int level,
/* Nothing to do */
}
+static void *fake_pci_to_ptr(dma_addr_t addr)
+{
+ return (void *)(uintptr_t)addr;
+}
+
+static dma_addr_t fake_ptr_to_pci(void *addr)
+{
+ return (dma_addr_t)(uintptr_t)addr;
+}
+
/*
* Generate a VME bus interrupt at the requested level & vector. Wait for
* interrupt to be acked.
@@ -202,7 +212,7 @@ static int fake_slave_set(struct vme_slave_resource *image,
int enabled,
bridge->slaves[i].enabled = enabled;
bridge->slaves[i].vme_base = vme_base;
bridge->slaves[i].size = size;
- bridge->slaves[i].buf_base = buf_base;
+ bridge->slaves[i].buf_base = fake_pci_to_ptr(buf_base);
bridge->slaves[i].aspace = aspace;
bridge->slaves[i].cycle = cycle;
@@ -230,7 +240,7 @@ static int fake_slave_get(struct vme_slave_resource *image,
int *enabled,
*enabled = bridge->slaves[i].enabled;
*vme_base = bridge->slaves[i].vme_base;
*size = bridge->slaves[i].size;
- *buf_base = bridge->slaves[i].buf_base;
+ *buf_base = fake_ptr_to_pci(bridge->slaves[i].buf_base);
*aspace = bridge->slaves[i].aspace;
*cycle = bridge->slaves[i].cycle;
@@ -431,7 +441,7 @@ static u8 fake_vmeread8(struct fake_driver *bridge,
unsigned long long addr,
if ((addr >= start) && (addr < end)) {
offset = addr - bridge->slaves[i].vme_base;
- loc = (u8 *)((void *)bridge->slaves[i].buf_base +
offset);
+ loc = (u8 *)(bridge->slaves[i].buf_base + offset);
retval = *loc;
break;
@@ -463,7 +473,7 @@ static u16 fake_vmeread16(struct fake_driver *bridge,
unsigned long long addr,
if ((addr >= start) && ((addr + 1) < end)) {
offset = addr - bridge->slaves[i].vme_base;
- loc = (u16 *)((void *)bridge->slaves[i].buf_base +
offset);
+ loc = (u16 *)(bridge->slaves[i].buf_base + offset);
retval = *loc;
break;
@@ -495,7 +505,7 @@ static u32 fake_vmeread32(struct fake_driver *bridge,
unsigned long long addr,
if ((addr >= start) && ((addr + 3) < end)) {
offset = addr - bridge->slaves[i].vme_base;
- loc = (u32 *)((void *)bridge->slaves[i].buf_base +
offset);
+ loc = (u32 *)(bridge->slaves[i].buf_base + offset);
retval = *loc;
break;
@@ -997,7 +1007,7 @@ static void *fake_alloc_consistent(struct device *parent,
size_t size,
void *alloc = kmalloc(size, GFP_KERNEL);
if (alloc != NULL)
- *dma = (dma_addr_t)(unsigned long)alloc;
+ *dma = fake_ptr_to_pci(alloc);
return alloc;
}
@@ -1031,7 +1041,7 @@ static int fake_crcsr_init(struct vme_bridge *fake_bridge)
/* Allocate mem for CR/CSR image */
bridge->crcsr_kernel = kzalloc(VME_CRCSR_BUF_SIZE, GFP_KERNEL);
- bridge->crcsr_bus = (dma_addr_t)bridge->crcsr_kernel;
+ bridge->crcsr_bus = fake_ptr_to_pci(bridge->crcsr_kernel);
if (bridge->crcsr_kernel == NULL)
return -ENOMEM;
--
2.9.0
_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
