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-rw-r--r--drivers/spi/spi_mpc83xx.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
index 0c16a2b39b41..fe69e94043e1 100644
--- a/drivers/spi/spi_mpc83xx.c
+++ b/drivers/spi/spi_mpc83xx.c
@@ -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) {