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Blackfin SPI driver: reconfigure speed_hz and bits_per_word in each spi transfer

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- reconfigure SPI baud from speed_hz of each spi transfer
 - according to spi_transfer.bits_per_word to reprogram register and setup
   correct SPI operation handlers

Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bryan Wu 2007-12-04 23:45:23 -08:00 committed by Linus Torvalds
parent 003d922618
commit 092e1fdaf3
1 changed files with 45 additions and 7 deletions
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52
drivers/spi/spi_bfin5xx.c
View file

@ -234,10 +234,8 @@ static int restore_state(struct driver_data *drv_data)
dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n");
/* Load the registers */
write_BAUD(drv_data, chip->baud);
chip->ctl_reg &= (~BIT_CTL_TIMOD);
chip->ctl_reg |= (chip->width << 8);
write_CTRL(drv_data, chip->ctl_reg);
write_BAUD(drv_data, chip->baud);
bfin_spi_enable(drv_data);
cs_active(drv_data, chip);
@ -679,6 +677,7 @@ static void pump_transfers(unsigned long data)
message = drv_data->cur_msg;
transfer = drv_data->cur_transfer;
chip = drv_data->cur_chip;
/*
* if msg is error or done, report it back using complete() callback
*/
@ -736,15 +735,48 @@ static void pump_transfers(unsigned long data)
drv_data->len_in_bytes = transfer->len;
drv_data->cs_change = transfer->cs_change;
width = chip->width;
/* Bits per word setup */
switch (transfer->bits_per_word) {
case 8:
drv_data->n_bytes = 1;
width = CFG_SPI_WORDSIZE8;
drv_data->read = chip->cs_change_per_word ?
u8_cs_chg_reader : u8_reader;
drv_data->write = chip->cs_change_per_word ?
u8_cs_chg_writer : u8_writer;
drv_data->duplex = chip->cs_change_per_word ?
u8_cs_chg_duplex : u8_duplex;
break;
case 16:
drv_data->n_bytes = 2;
width = CFG_SPI_WORDSIZE16;
drv_data->read = chip->cs_change_per_word ?
u16_cs_chg_reader : u16_reader;
drv_data->write = chip->cs_change_per_word ?
u16_cs_chg_writer : u16_writer;
drv_data->duplex = chip->cs_change_per_word ?
u16_cs_chg_duplex : u16_duplex;
break;
default:
/* No change, the same as default setting */
drv_data->n_bytes = chip->n_bytes;
width = chip->width;
drv_data->write = drv_data->tx ? chip->write : null_writer;
drv_data->read = drv_data->rx ? chip->read : null_reader;
drv_data->duplex = chip->duplex ? chip->duplex : null_writer;
break;
}
cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD));
cr |= (width << 8);
write_CTRL(drv_data, cr);
if (width == CFG_SPI_WORDSIZE16) {
drv_data->len = (transfer->len) >> 1;
} else {
drv_data->len = transfer->len;
}
drv_data->write = drv_data->tx ? chip->write : null_writer;
drv_data->read = drv_data->rx ? chip->read : null_reader;
drv_data->duplex = chip->duplex ? chip->duplex : null_writer;
dev_dbg(&drv_data->pdev->dev, "transfer: ",
"drv_data->write is %p, chip->write is %p, null_wr is %p\n",
drv_data->write, chip->write, null_writer);
@ -753,6 +785,12 @@ static void pump_transfers(unsigned long data)
message->state = RUNNING_STATE;
dma_config = 0;
/* Speed setup (surely valid because already checked) */
if (transfer->speed_hz)
write_BAUD(drv_data, hz_to_spi_baud(transfer->speed_hz));
else
write_BAUD(drv_data, chip->baud);
write_STAT(drv_data, BIT_STAT_CLR);
cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD));
cs_active(drv_data, chip);