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authorBen Dooks <ben.dooks@codethink.co.uk>2015-03-25 11:27:52 +0000
committerUlf Hansson <ulf.hansson@linaro.org>2015-04-09 09:08:15 +0200
commit76184ac17edf3c640390b0eddc3aa7be1095fb9f (patch)
tree6de305bc6530a70b743c2a9262c88628ff36da8f /drivers/mmc
parent6687c42fa71acd6ae39608c5af4146c82bd0c0ea (diff)
downloadlinux-76184ac17edf3c640390b0eddc3aa7be1095fb9f.tar.bz2
mmc: dw_mmc: fix fifo ordering in big endian
The dw_mmc driver changes to make the IO accesors endian agnostic did not take into account the fifo accesses do not need to be swapped. To fix this add a mmci_fifo_read/write wrapper to allow these to be passed through the IO without being swapped. Since these are now specific functions, it would be easier just to store the pointer to the fifo registers in the host block instead of the offset to them. So change the host->data_offset to host->fifo_reg (which also means we catch all the places this is read or written). Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/dw_mmc.c59
-rw-r--r--drivers/mmc/host/dw_mmc.h14
2 files changed, 38 insertions, 35 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index a09840d0c221..8ce9a52d365b 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1757,8 +1757,7 @@ static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
buf += len;
cnt -= len;
if (host->part_buf_count == 2) {
- mci_writew(host, DATA(host->data_offset),
- host->part_buf16);
+ mci_fifo_writew(host->fifo_reg, host->part_buf16);
host->part_buf_count = 0;
}
}
@@ -1775,15 +1774,14 @@ static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
cnt -= len;
/* push data from aligned buffer into fifo */
for (i = 0; i < items; ++i)
- mci_writew(host, DATA(host->data_offset),
- aligned_buf[i]);
+ mci_fifo_writew(host->fifo_reg, aligned_buf[i]);
}
} else
#endif
{
u16 *pdata = buf;
for (; cnt >= 2; cnt -= 2)
- mci_writew(host, DATA(host->data_offset), *pdata++);
+ mci_fifo_writew(host->fifo_reg, *pdata++);
buf = pdata;
}
/* put anything remaining in the part_buf */
@@ -1792,8 +1790,7 @@ static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
/* Push data if we have reached the expected data length */
if ((data->bytes_xfered + init_cnt) ==
(data->blksz * data->blocks))
- mci_writew(host, DATA(host->data_offset),
- host->part_buf16);
+ mci_fifo_writew(host->fifo_reg, host->part_buf16);
}
}
@@ -1808,8 +1805,7 @@ static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
int items = len >> 1;
int i;
for (i = 0; i < items; ++i)
- aligned_buf[i] = mci_readw(host,
- DATA(host->data_offset));
+ aligned_buf[i] = mci_fifo_readw(host->fifo_reg);
/* memcpy from aligned buffer into output buffer */
memcpy(buf, aligned_buf, len);
buf += len;
@@ -1820,11 +1816,11 @@ static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
{
u16 *pdata = buf;
for (; cnt >= 2; cnt -= 2)
- *pdata++ = mci_readw(host, DATA(host->data_offset));
+ *pdata++ = mci_fifo_readw(host->fifo_reg);
buf = pdata;
}
if (cnt) {
- host->part_buf16 = mci_readw(host, DATA(host->data_offset));
+ host->part_buf16 = mci_fifo_readw(host->fifo_reg);
dw_mci_pull_final_bytes(host, buf, cnt);
}
}
@@ -1840,8 +1836,7 @@ static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
buf += len;
cnt -= len;
if (host->part_buf_count == 4) {
- mci_writel(host, DATA(host->data_offset),
- host->part_buf32);
+ mci_fifo_writel(host->fifo_reg, host->part_buf32);
host->part_buf_count = 0;
}
}
@@ -1858,15 +1853,14 @@ static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
cnt -= len;
/* push data from aligned buffer into fifo */
for (i = 0; i < items; ++i)
- mci_writel(host, DATA(host->data_offset),
- aligned_buf[i]);
+ mci_fifo_writel(host->fifo_reg, aligned_buf[i]);
}
} else
#endif
{
u32 *pdata = buf;
for (; cnt >= 4; cnt -= 4)
- mci_writel(host, DATA(host->data_offset), *pdata++);
+ mci_fifo_writel(host->fifo_reg, *pdata++);
buf = pdata;
}
/* put anything remaining in the part_buf */
@@ -1875,8 +1869,7 @@ static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
/* Push data if we have reached the expected data length */
if ((data->bytes_xfered + init_cnt) ==
(data->blksz * data->blocks))
- mci_writel(host, DATA(host->data_offset),
- host->part_buf32);
+ mci_fifo_writel(host->fifo_reg, host->part_buf32);
}
}
@@ -1891,8 +1884,7 @@ static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
int items = len >> 2;
int i;
for (i = 0; i < items; ++i)
- aligned_buf[i] = mci_readl(host,
- DATA(host->data_offset));
+ aligned_buf[i] = mci_fifo_readl(host->fifo_reg);
/* memcpy from aligned buffer into output buffer */
memcpy(buf, aligned_buf, len);
buf += len;
@@ -1903,11 +1895,11 @@ static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
{
u32 *pdata = buf;
for (; cnt >= 4; cnt -= 4)
- *pdata++ = mci_readl(host, DATA(host->data_offset));
+ *pdata++ = mci_fifo_readl(host->fifo_reg);
buf = pdata;
}
if (cnt) {
- host->part_buf32 = mci_readl(host, DATA(host->data_offset));
+ host->part_buf32 = mci_fifo_readl(host->fifo_reg);
dw_mci_pull_final_bytes(host, buf, cnt);
}
}
@@ -1924,8 +1916,7 @@ static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
cnt -= len;
if (host->part_buf_count == 8) {
- mci_writeq(host, DATA(host->data_offset),
- host->part_buf);
+ mci_fifo_writeq(host->fifo_reg, host->part_buf);
host->part_buf_count = 0;
}
}
@@ -1942,15 +1933,14 @@ static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
cnt -= len;
/* push data from aligned buffer into fifo */
for (i = 0; i < items; ++i)
- mci_writeq(host, DATA(host->data_offset),
- aligned_buf[i]);
+ mci_fifo_writeq(host->fifo_reg, aligned_buf[i]);
}
} else
#endif
{
u64 *pdata = buf;
for (; cnt >= 8; cnt -= 8)
- mci_writeq(host, DATA(host->data_offset), *pdata++);
+ mci_fifo_writeq(host->fifo_reg, *pdata++);
buf = pdata;
}
/* put anything remaining in the part_buf */
@@ -1959,8 +1949,7 @@ static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
/* Push data if we have reached the expected data length */
if ((data->bytes_xfered + init_cnt) ==
(data->blksz * data->blocks))
- mci_writeq(host, DATA(host->data_offset),
- host->part_buf);
+ mci_fifo_writeq(host->fifo_reg, host->part_buf);
}
}
@@ -1975,8 +1964,8 @@ static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
int items = len >> 3;
int i;
for (i = 0; i < items; ++i)
- aligned_buf[i] = mci_readq(host,
- DATA(host->data_offset));
+ aligned_buf[i] = mci_fifo_readq(host->fifo_reg);
+
/* memcpy from aligned buffer into output buffer */
memcpy(buf, aligned_buf, len);
buf += len;
@@ -1987,11 +1976,11 @@ static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
{
u64 *pdata = buf;
for (; cnt >= 8; cnt -= 8)
- *pdata++ = mci_readq(host, DATA(host->data_offset));
+ *pdata++ = mci_fifo_readq(host->fifo_reg);
buf = pdata;
}
if (cnt) {
- host->part_buf = mci_readq(host, DATA(host->data_offset));
+ host->part_buf = mci_fifo_readq(host->fifo_reg);
dw_mci_pull_final_bytes(host, buf, cnt);
}
}
@@ -2852,9 +2841,9 @@ int dw_mci_probe(struct dw_mci *host)
dev_info(host->dev, "Version ID is %04x\n", host->verid);
if (host->verid < DW_MMC_240A)
- host->data_offset = DATA_OFFSET;
+ host->fifo_reg = host->regs + DATA_OFFSET;
else
- host->data_offset = DATA_240A_OFFSET;
+ host->fifo_reg = host->regs + DATA_240A_OFFSET;
tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index b8051d049fb7..f45ab91de339 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -169,6 +169,16 @@
#define SDMMC_CTRL_ALL_RESET_FLAGS \
(SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET)
+/* FIFO register access macros. These should not change the data endian-ness
+ * as they are written to memory to be dealt with by the upper layers */
+#define mci_fifo_readw(__reg) __raw_readw(__reg)
+#define mci_fifo_readl(__reg) __raw_readl(__reg)
+#define mci_fifo_readq(__reg) __raw_readq(__reg)
+
+#define mci_fifo_writew(__value, __reg) __raw_writew(__reg, __value)
+#define mci_fifo_writel(__value, __reg) __raw_writel(__reg, __value)
+#define mci_fifo_writeq(__value, __reg) __raw_writeq(__reg, __value)
+
/* Register access macros */
#define mci_readl(dev, reg) \
readl_relaxed((dev)->regs + SDMMC_##reg)
@@ -200,6 +210,10 @@
(*(volatile u64 __force *)((dev)->regs + SDMMC_##reg))
#define mci_writeq(dev, reg, value) \
(*(volatile u64 __force *)((dev)->regs + SDMMC_##reg) = (value))
+
+#define __raw_writeq(__value, __reg) \
+ (*(volatile u64 __force *)(__reg) = (__value))
+#define __raw_readq(__reg) (*(volatile u64 __force *)(__reg))
#endif
extern int dw_mci_probe(struct dw_mci *host);