spi_mpc8xxx: Factor out SPI mode change steps into a call

We'll add more steps soon, so get rid of the duplication.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c
index 518671b8afe52c3541448645ad070ac299626907..4b119eaf4e6bac0a2cb790ae2eb6869483a2058a 100644 (file)
--- a/drivers/spi/spi_mpc8xxx.c
+++ b/drivers/spi/spi_mpc8xxx.c
@@ -155,6 +155,26 @@ MPC83XX_SPI_TX_BUF(u8)
 MPC83XX_SPI_TX_BUF(u16)
 MPC83XX_SPI_TX_BUF(u32)
 
+static void mpc8xxx_spi_change_mode(struct spi_device *spi)
+{
+       struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
+       struct spi_mpc8xxx_cs *cs = spi->controller_state;
+       __be32 __iomem *mode = &mspi->base->mode;
+       unsigned long flags;
+
+       if (cs->hw_mode == mpc8xxx_spi_read_reg(mode))
+               return;
+
+       /* Turn off IRQs locally to minimize time that SPI is disabled. */
+       local_irq_save(flags);
+
+       /* Turn off SPI unit prior changing mode */
+       mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
+       mpc8xxx_spi_write_reg(mode, cs->hw_mode);
+
+       local_irq_restore(flags);
+}
+
 static void mpc8xxx_spi_chipselect(struct spi_device *spi, int value)
 {
        struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
@@ -168,27 +188,13 @@ static void mpc8xxx_spi_chipselect(struct spi_device *spi, int value)
        }
 
        if (value == BITBANG_CS_ACTIVE) {
-               u32 regval = mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->mode);
-
                mpc8xxx_spi->rx_shift = cs->rx_shift;
                mpc8xxx_spi->tx_shift = cs->tx_shift;
                mpc8xxx_spi->get_rx = cs->get_rx;
                mpc8xxx_spi->get_tx = cs->get_tx;
 
-               if (cs->hw_mode != regval) {
-                       unsigned long flags;
-                       __be32 __iomem *mode = &mpc8xxx_spi->base->mode;
-
-                       regval = cs->hw_mode;
-                       /* Turn off IRQs locally to minimize time that
-                        * SPI is disabled
-                        */
-                       local_irq_save(flags);
-                       /* Turn off SPI unit prior changing mode */
-                       mpc8xxx_spi_write_reg(mode, regval & ~SPMODE_ENABLE);
-                       mpc8xxx_spi_write_reg(mode, regval);
-                       local_irq_restore(flags);
-               }
+               mpc8xxx_spi_change_mode(spi);
+
                if (pdata->cs_control)
                        pdata->cs_control(spi, pol);
        }
@@ -198,7 +204,6 @@ static
 int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
 {
        struct mpc8xxx_spi *mpc8xxx_spi;
-       u32 regval;
        u8 bits_per_word, pm;
        u32 hz;
        struct spi_mpc8xxx_cs   *cs = spi->controller_state;
@@ -286,21 +291,8 @@ int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
                pm--;
 
        cs->hw_mode |= SPMODE_PM(pm);
-       regval =  mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->mode);
-       if (cs->hw_mode != regval) {
-               unsigned long flags;
-               __be32 __iomem *mode = &mpc8xxx_spi->base->mode;
-
-               regval = cs->hw_mode;
-               /* Turn off IRQs locally to minimize time
-                * that SPI is disabled
-                */
-               local_irq_save(flags);
-               /* Turn off SPI unit prior changing mode */
-               mpc8xxx_spi_write_reg(mode, regval & ~SPMODE_ENABLE);
-               mpc8xxx_spi_write_reg(mode, regval);
-               local_irq_restore(flags);
-       }
+
+       mpc8xxx_spi_change_mode(spi);
        return 0;
 }