From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Looking at the backlogs, I am not the only one who missed that the above
functions do not read u32 from one register, but create a virtual u32
from reading to adjacent u16 registers (which depending on 'bus_shift'
can be up to 8 byte apart). Because this driver supports old hardware
for which we don't have documentation, I first wrongly assumed there was
a variant which had a few u32 registers. Let's give the functions more
descriptive names to make it more obvious what is happening.
Reviewed-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/tmio_mmc.h | 5 ++---
drivers/mmc/host/tmio_mmc_pio.c | 22 +++++++++++-----------
2 files changed, 13 insertions(+), 14 deletions(-)
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 439fdad2bad91d..e75e5ca220bc0a 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -232,7 +232,7 @@ static inline void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
readsw(host->ctl + (addr << host->bus_shift), buf, count);
}
-static inline u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr)
+static inline u32 sd_ctrl_read16_and_16_as_32(struct tmio_mmc_host *host, int addr)
{
return readw(host->ctl + (addr << host->bus_shift)) |
readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
@@ -254,11 +254,10 @@ static inline void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
writesw(host->ctl + (addr << host->bus_shift), buf, count);
}
-static inline void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
+static inline void sd_ctrl_write32_as_16_and_16(struct tmio_mmc_host *host, int addr, u32 val)
{
writew(val, host->ctl + (addr << host->bus_shift));
writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
}
-
#endif
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index 0b52ef1271a5cd..3635940bc31d1b 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -55,18 +55,18 @@
void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
- sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
+ sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
}
void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
- sd_ctrl_write32(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
+ sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
}
static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
- sd_ctrl_write32(host, CTL_STATUS, ~i);
+ sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, ~i);
}
static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
@@ -375,7 +375,7 @@ static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command
tmio_mmc_enable_mmc_irqs(host, irq_mask);
/* Fire off the command */
- sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
+ sd_ctrl_write32_as_16_and_16(host, CTL_ARG_REG, cmd->arg);
sd_ctrl_write16(host, CTL_SD_CMD, c);
return 0;
@@ -530,7 +530,7 @@ static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
goto out;
if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
- u32 status = sd_ctrl_read32(host, CTL_STATUS);
+ u32 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS);
bool done = false;
/*
@@ -585,7 +585,7 @@ static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
*/
for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
- cmd->resp[i] = sd_ctrl_read32(host, addr);
+ cmd->resp[i] = sd_ctrl_read16_and_16_as_32(host, addr);
if (cmd->flags & MMC_RSP_136) {
cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
@@ -702,14 +702,14 @@ irqreturn_t tmio_mmc_irq(int irq, void *devid)
struct tmio_mmc_host *host = devid;
unsigned int ireg, status;
- status = sd_ctrl_read32(host, CTL_STATUS);
+ status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS);
ireg = status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
pr_debug_status(status);
pr_debug_status(ireg);
/* Clear the status except the interrupt status */
- sd_ctrl_write32(host, CTL_STATUS, TMIO_MASK_IRQ);
+ sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, TMIO_MASK_IRQ);
if (__tmio_mmc_card_detect_irq(host, ireg, status))
return IRQ_HANDLED;
@@ -944,7 +944,7 @@ static int tmio_mmc_get_ro(struct mmc_host *mmc)
return ret;
ret = !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
- (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
+ (sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
return ret;
}
@@ -964,7 +964,7 @@ static int tmio_mmc_card_busy(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
- return !(sd_ctrl_read32(host, CTL_STATUS2) & TMIO_STATUS2_DAT0);
+ return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS2) & TMIO_STATUS2_DAT0);
}
static struct mmc_host_ops tmio_mmc_ops = {
@@ -1113,7 +1113,7 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host,
tmio_mmc_clk_stop(_host);
tmio_mmc_reset(_host);
- _host->sdcard_irq_mask = sd_ctrl_read32(_host, CTL_IRQ_MASK);
+ _host->sdcard_irq_mask = sd_ctrl_read16_and_16_as_32(_host, CTL_IRQ_MASK);
tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
/* Unmask the IRQs we want to know about */
--
2.7.0
