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spi: sh-hspi: modify write/read method 

Current sh-hspi had wrong write/read method which was not linux standard.
If spi_transfer requests tx[2], rx[2] len=2,
then, driver should run tx[0], rx[0], tx[1], rx[1].
But current sh-hspi runs tx[0], tx[1], rx[0], rx[1].
This patch fixes it up.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Kuninori Morimoto 2012-03-14 02:48:25 -07:00 committed by Grant Likely
parent 49e599b859
commit bb9c5687e8
1 changed files with 24 additions and 69 deletions
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93
drivers/spi/spi-sh-hspi.c
View File

@ -86,66 +86,6 @@ static int hspi_status_check_timeout(struct hspi_priv *hspi, u32 mask, u32 val)
return -ETIMEDOUT;
}
static int hspi_push(struct hspi_priv *hspi, struct spi_message *msg,
struct spi_transfer *t)
{
int i, ret;
u8 *data = (u8 *)t->tx_buf;
/*
* FIXME
* very simple, but polling transfer
*/
for (i = 0; i < t->len; i++) {
/* wait remains */
ret = hspi_status_check_timeout(hspi, 0x1, 0x0);
if (ret < 0)
return ret;
hspi_write(hspi, SPTBR, (u32)data[i]);
/* wait recive */
ret = hspi_status_check_timeout(hspi, 0x4, 0x4);
if (ret < 0)
return ret;
/* dummy read */
hspi_read(hspi, SPRBR);
}
return 0;
}
static int hspi_pop(struct hspi_priv *hspi, struct spi_message *msg,
struct spi_transfer *t)
{
int i, ret;
u8 *data = (u8 *)t->rx_buf;
/*
* FIXME
* very simple, but polling receive
*/
for (i = 0; i < t->len; i++) {
/* wait remains */
ret = hspi_status_check_timeout(hspi, 0x1, 0);
if (ret < 0)
return ret;
/* dummy write */
hspi_write(hspi, SPTBR, 0x0);
/* wait recive */
ret = hspi_status_check_timeout(hspi, 0x4, 0x4);
if (ret < 0)
return ret;
data[i] = (u8)hspi_read(hspi, SPRBR);
}
return 0;
}
/*
* spi master function
*/
@ -223,7 +163,9 @@ static int hspi_transfer_one_message(struct spi_master *master,
{
struct hspi_priv *hspi = spi_master_get_devdata(master);
struct spi_transfer *t;
int ret;
u32 tx;
u32 rx;
int ret, i;
dev_dbg(hspi->dev, "%s\n", __func__);
@ -231,19 +173,32 @@ static int hspi_transfer_one_message(struct spi_master *master,
list_for_each_entry(t, &msg->transfers, transfer_list) {
hspi_hw_setup(hspi, msg, t);
if (t->tx_buf) {
ret = hspi_push(hspi, msg, t);
for (i = 0; i < t->len; i++) {
/* wait remains */
ret = hspi_status_check_timeout(hspi, 0x1, 0);
if (ret < 0)
goto error;
}
if (t->rx_buf) {
ret = hspi_pop(hspi, msg, t);
break;
tx = 0;
if (t->tx_buf)
tx = (u32)((u8 *)t->tx_buf)[i];
hspi_write(hspi, SPTBR, tx);
/* wait recive */
ret = hspi_status_check_timeout(hspi, 0x4, 0x4);
if (ret < 0)
goto error;
break;
rx = hspi_read(hspi, SPRBR);
if (t->rx_buf)
((u8 *)t->rx_buf)[i] = (u8)rx;
}
msg->actual_length += t->len;
}
error:
msg->status = ret;
spi_finalize_current_message(master);