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mmc: dw_mmc: use resource_size_t to store physical address 

The dw_mmc driver stores the physical address of the MMIO registers
in a pointer, which requires the use of type casts, and is actually
broken if anyone ever has this device on a 32-bit SoC in registers
above 4GB. Gcc warns about this possibility when the driver is built
with ARM LPAE enabled:

mmc/host/dw_mmc.c: In function 'dw_mci_edmac_start_dma':
mmc/host/dw_mmc.c:702:17: warning: cast from pointer to integer of different size
  cfg.dst_addr = (dma_addr_t)(host->phy_regs + fifo_offset);
                 ^
mmc/host/dw_mmc-pltfm.c: In function 'dw_mci_pltfm_register':
mmc/host/dw_mmc-pltfm.c:63:19: warning: cast to pointer from integer of different size
  host->phy_regs = (void *)(regs->start);

This changes the code to use resource_size_t, which gets rid of the
warning, the bug and the useless casts.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Arnd Bergmann 2015-11-12 15:14:23 +01:00 committed by Ulf Hansson
parent 3bbb0deea6
commit 260b316436
3 changed files with 3 additions and 3 deletions
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2
drivers/mmc/host/dw_mmc-pltfm.c
View File

@ -60,7 +60,7 @@ int dw_mci_pltfm_register(struct platform_device *pdev,
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
/* Get registers' physical base address */
host->phy_regs = (void *)(regs->start);
host->phy_regs = regs->start;
host->regs = devm_ioremap_resource(&pdev->dev, regs);
if (IS_ERR(host->regs))
return PTR_ERR(host->regs);

2
drivers/mmc/host/dw_mmc.c
View File

@ -699,7 +699,7 @@ static int dw_mci_edmac_start_dma(struct dw_mci *host,
int ret = 0;
/* Set external dma config: burst size, burst width */
cfg.dst_addr = (dma_addr_t)(host->phy_regs + fifo_offset);
cfg.dst_addr = host->phy_regs + fifo_offset;
cfg.src_addr = cfg.dst_addr;
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;

2
include/linux/mmc/dw_mmc.h
View File

@ -172,7 +172,7 @@ struct dw_mci {
/* For edmac */
struct dw_mci_dma_slave *dms;
/* Registers's physical base address */
void *phy_regs;
resource_size_t phy_regs;
u32 cmd_status;
u32 data_status;