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spi_mpc83xx: in "QE mode", use sysclk/2 

For MPC8349E input to the SPI Baud Rate Generator is SYSCLK, but it's
SYSCLK/2 for MPC8323E (SPI in QE).  Fix this, and remove confusion by
renaming the mpc83xx_spi->sysclk member as mpc83xx_spi->spibrg.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anton Vorontsov 2007-08-10 13:01:01 -07:00 committed by Linus Torvalds
parent 8dfe9c21a8
commit e24a4d1ee3
1 changed files with 13 additions and 8 deletions
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21
drivers/spi/spi_mpc83xx.c
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@ -86,7 +86,7 @@ struct mpc83xx_spi {
unsigned nsecs; /* (clock cycle time)/2 */
u32 sysclk;
u32 spibrg; /* SPIBRG input clock */
u32 rx_shift; /* RX data reg shift when in qe mode */
u32 tx_shift; /* TX data reg shift when in qe mode */
@ -169,17 +169,18 @@ static void mpc83xx_spi_chipselect(struct spi_device *spi, int value)
regval |= SPMODE_LEN(len);
if ((mpc83xx_spi->sysclk / spi->max_speed_hz) >= 64) {
u8 pm = mpc83xx_spi->sysclk / (spi->max_speed_hz * 64);
if ((mpc83xx_spi->spibrg / spi->max_speed_hz) >= 64) {
u8 pm = mpc83xx_spi->spibrg / (spi->max_speed_hz * 64);
if (pm > 0x0f) {
printk(KERN_WARNING "MPC83xx SPI: SPICLK can't be less then a SYSCLK/1024!\n"
"Requested SPICLK is %d Hz. Will use %d Hz instead.\n",
spi->max_speed_hz, mpc83xx_spi->sysclk / 1024);
dev_err(&spi->dev, "Requested speed is too "
"low: %d Hz. Will use %d Hz instead.\n",
spi->max_speed_hz,
mpc83xx_spi->spibrg / 1024);
pm = 0x0f;
}
regval |= SPMODE_PM(pm) | SPMODE_DIV16;
} else {
u8 pm = mpc83xx_spi->sysclk / (spi->max_speed_hz * 4);
u8 pm = mpc83xx_spi->spibrg / (spi->max_speed_hz * 4);
regval |= SPMODE_PM(pm);
}
@ -429,13 +430,17 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
mpc83xx_spi->bitbang.chipselect = mpc83xx_spi_chipselect;
mpc83xx_spi->bitbang.setup_transfer = mpc83xx_spi_setup_transfer;
mpc83xx_spi->bitbang.txrx_bufs = mpc83xx_spi_bufs;
mpc83xx_spi->sysclk = pdata->sysclk;
mpc83xx_spi->activate_cs = pdata->activate_cs;
mpc83xx_spi->deactivate_cs = pdata->deactivate_cs;
mpc83xx_spi->qe_mode = pdata->qe_mode;
mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8;
mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8;
if (mpc83xx_spi->qe_mode)
mpc83xx_spi->spibrg = pdata->sysclk / 2;
else
mpc83xx_spi->spibrg = pdata->sysclk;
mpc83xx_spi->rx_shift = 0;
mpc83xx_spi->tx_shift = 0;
if (mpc83xx_spi->qe_mode) {