diff options
Diffstat (limited to 'drivers/spi/spi-mpc512x-psc.c')
| -rw-r--r-- | drivers/spi/spi-mpc512x-psc.c | 43 |
1 files changed, 29 insertions, 14 deletions
diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c index 89480b281d7..dfddf336912 100644 --- a/drivers/spi/spi-mpc512x-psc.c +++ b/drivers/spi/spi-mpc512x-psc.c @@ -28,6 +28,7 @@ #include <linux/clk.h> #include <linux/spi/spi.h> #include <linux/fsl_devices.h> +#include <linux/gpio.h> #include <asm/mpc52xx_psc.h> struct mpc512x_psc_spi { @@ -113,7 +114,7 @@ static void mpc512x_psc_spi_activate_cs(struct spi_device *spi) out_be32(&psc->ccr, ccr); mps->bits_per_word = cs->bits_per_word; - if (mps->cs_control) + if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0); } @@ -121,7 +122,7 @@ static void mpc512x_psc_spi_deactivate_cs(struct spi_device *spi) { struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); - if (mps->cs_control) + if (mps->cs_control && gpio_is_valid(spi->cs_gpio)) mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1); } @@ -148,6 +149,9 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, in_8(&psc->mode); out_8(&psc->mode, 0x0); + /* enable transmiter/receiver */ + out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); + while (len) { int count; int i; @@ -164,7 +168,7 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, for (i = count; i > 0; i--) { data = tx_buf ? *tx_buf++ : 0; - if (len == EOFBYTE) + if (len == EOFBYTE && t->cs_change) setbits32(&fifo->txcmd, MPC512x_PSC_FIFO_EOF); out_8(&fifo->txdata_8, data); len--; @@ -176,10 +180,6 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); out_be32(&fifo->tximr, MPC512x_PSC_FIFO_EMPTY); - /* enable transmiter/receiver */ - out_8(&psc->command, - MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); - wait_for_completion(&mps->done); mdelay(1); @@ -204,9 +204,6 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, while (in_be32(&fifo->rxcnt)) { in_8(&fifo->rxdata_8); } - - out_8(&psc->command, - MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); } /* disable transmiter/receiver and fifo interrupt */ out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); @@ -278,6 +275,7 @@ static int mpc512x_psc_spi_setup(struct spi_device *spi) struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); struct mpc512x_psc_spi_cs *cs = spi->controller_state; unsigned long flags; + int ret; if (spi->bits_per_word % 8) return -EINVAL; @@ -286,6 +284,19 @@ static int mpc512x_psc_spi_setup(struct spi_device *spi) cs = kzalloc(sizeof *cs, GFP_KERNEL); if (!cs) return -ENOMEM; + + if (gpio_is_valid(spi->cs_gpio)) { + ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev)); + if (ret) { + dev_err(&spi->dev, "can't get CS gpio: %d\n", + ret); + kfree(cs); + return ret; + } + gpio_direction_output(spi->cs_gpio, + spi->mode & SPI_CS_HIGH ? 0 : 1); + } + spi->controller_state = cs; } @@ -319,6 +330,8 @@ static int mpc512x_psc_spi_transfer(struct spi_device *spi, static void mpc512x_psc_spi_cleanup(struct spi_device *spi) { + if (gpio_is_valid(spi->cs_gpio)) + gpio_free(spi->cs_gpio); kfree(spi->controller_state); } @@ -405,6 +418,11 @@ static irqreturn_t mpc512x_psc_spi_isr(int irq, void *dev_id) return IRQ_NONE; } +static void mpc512x_spi_cs_control(struct spi_device *spi, bool onoff) +{ + gpio_set_value(spi->cs_gpio, onoff); +} + /* bus_num is used only for the case dev->platform_data == NULL */ static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr, u32 size, unsigned int irq, @@ -425,12 +443,9 @@ static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr, mps->irq = irq; if (pdata == NULL) { - dev_err(dev, "probe called without platform data, no " - "cs_control function will be called\n"); - mps->cs_control = NULL; + mps->cs_control = mpc512x_spi_cs_control; mps->sysclk = 0; master->bus_num = bus_num; - master->num_chipselect = 255; } else { mps->cs_control = pdata->cs_control; mps->sysclk = pdata->sysclk; |