spi: davinci: make chip-slect specific parameters really chip-select specific

Some chip-select specific paramterers like wdelay, parity, usage of
chip-select timers (and the actual timer values) are included in
platform data forcing the same behaviour across all chip-selects.

Create a new davinci_spi_config data structure which can be passed
along using controller_data member of spi_device data structure
on a per-device basis.

Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com>
Tested-By: Michael Williamson <michael.williamson@criticallink.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

1 files changed, 37 insertions, 30 deletions

diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c
index 54808577c121..d4320f784070 100644
--- a/drivers/spi/davinci_spi.c
+++ b/drivers/spi/davinci_spi.c
@@ -156,6 +156,8 @@ struct davinci_spi {
         struct davinci_spi_slave slave[SPI_MAX_CHIPSELECT];
 };
 
+static struct davinci_spi_config davinci_spi_default_cfg;
+
 static unsigned use_dma;
 
 static void davinci_spi_rx_buf_u8(u32 data, struct davinci_spi *davinci_spi)
@@ -434,8 +436,12 @@ static int davinci_spi_setup(struct spi_device *spi)
         int retval;
         struct davinci_spi *davinci_spi;
         struct davinci_spi_dma *davinci_spi_dma;
+        struct davinci_spi_config *spicfg;
 
         davinci_spi = spi_master_get_devdata(spi->master);
+        spicfg = (struct davinci_spi_config *)spi->controller_data;
+        if (!spicfg)
+                spicfg = &davinci_spi_default_cfg;
 
         /* if bits per word length is zero then set it default 8 */
         if (!spi->bits_per_word)
@@ -496,31 +502,34 @@ static int davinci_spi_setup(struct spi_device *spi)
          */
 
         if (davinci_spi->version == SPI_VERSION_2) {
+
                 clear_fmt_bits(davinci_spi->base, SPIFMT_WDELAY_MASK,
-                                spi->chip_select);
+                                                        spi->chip_select);
                 set_fmt_bits(davinci_spi->base,
-                                (davinci_spi->pdata->wdelay
-                                                << SPIFMT_WDELAY_SHIFT)
-                                        & SPIFMT_WDELAY_MASK,
-                                spi->chip_select);
+                                (spicfg->wdelay << SPIFMT_WDELAY_SHIFT) &
+                                SPIFMT_WDELAY_MASK, spi->chip_select);
 
-                if (davinci_spi->pdata->odd_parity)
-                        set_fmt_bits(davinci_spi->base,
-                                        SPIFMT_ODD_PARITY_MASK,
-                                        spi->chip_select);
+                if (spicfg->odd_parity)
+                        set_fmt_bits(davinci_spi->base, SPIFMT_ODD_PARITY_MASK,
+                                                        spi->chip_select);
                 else
                         clear_fmt_bits(davinci_spi->base,
                                         SPIFMT_ODD_PARITY_MASK,
                                         spi->chip_select);
 
-                if (davinci_spi->pdata->parity_enable)
-                        set_fmt_bits(davinci_spi->base,
-                                        SPIFMT_PARITYENA_MASK,
-                                        spi->chip_select);
+                if (spicfg->parity_enable)
+                        set_fmt_bits(davinci_spi->base, SPIFMT_PARITYENA_MASK,
+                                                        spi->chip_select);
                 else
-                        clear_fmt_bits(davinci_spi->base,
-                                        SPIFMT_PARITYENA_MASK,
-                                        spi->chip_select);
+                        clear_fmt_bits(davinci_spi->base, SPIFMT_PARITYENA_MASK,
+                                                        spi->chip_select);
+
+                if (spicfg->timer_disable)
+                        set_fmt_bits(davinci_spi->base, SPIFMT_DISTIMER_MASK,
+                                                        spi->chip_select);
+                else
+                        clear_fmt_bits(davinci_spi->base, SPIFMT_DISTIMER_MASK,
+                                                        spi->chip_select);
 
                 if (spi->mode & SPI_READY)
                         set_fmt_bits(davinci_spi->base,
@@ -531,14 +540,6 @@ static int davinci_spi_setup(struct spi_device *spi)
                                         SPIFMT_WAITENA_MASK,
                                         spi->chip_select);
 
-                if (davinci_spi->pdata->timer_disable)
-                        set_fmt_bits(davinci_spi->base,
-                                        SPIFMT_DISTIMER_MASK,
-                                        spi->chip_select);
-                else
-                        clear_fmt_bits(davinci_spi->base,
-                                        SPIFMT_DISTIMER_MASK,
-                                        spi->chip_select);
         }
 
         retval = davinci_spi_setup_transfer(spi, NULL);
@@ -662,9 +663,13 @@ static int davinci_spi_bufs_pio(struct spi_device *spi, struct spi_transfer *t)
         u32 tx_data, data1_reg_val;
         u32 buf_val, flg_val;
         struct davinci_spi_platform_data *pdata;
+        struct davinci_spi_config *spicfg;
 
         davinci_spi = spi_master_get_devdata(spi->master);
         pdata = davinci_spi->pdata;
+        spicfg = (struct davinci_spi_config *)spi->controller_data;
+        if (!spicfg)
+                spicfg = &davinci_spi_default_cfg;
 
         davinci_spi->tx = t->tx_buf;
         davinci_spi->rx = t->rx_buf;
@@ -684,8 +689,8 @@ static int davinci_spi_bufs_pio(struct spi_device *spi, struct spi_transfer *t)
         /* Enable SPI */
         set_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_SPIENA_MASK);
 
-        iowrite32(0 | (pdata->c2tdelay << SPI_C2TDELAY_SHIFT) |
-                        (pdata->t2cdelay << SPI_T2CDELAY_SHIFT),
+        iowrite32((spicfg->c2tdelay << SPI_C2TDELAY_SHIFT) |
+                        (spicfg->t2cdelay << SPI_T2CDELAY_SHIFT),
                         davinci_spi->base + SPIDELAY);
 
         count = davinci_spi->count;
@@ -792,12 +797,14 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
         struct davinci_spi_dma *davinci_spi_dma;
         int word_len, data_type, ret;
         unsigned long tx_reg, rx_reg;
-        struct davinci_spi_platform_data *pdata;
+        struct davinci_spi_config *spicfg;
         struct device *sdev;
 
         davinci_spi = spi_master_get_devdata(spi->master);
-        pdata = davinci_spi->pdata;
         sdev = davinci_spi->bitbang.master->dev.parent;
+        spicfg = (struct davinci_spi_config *)spi->controller_data;
+        if (!spicfg)
+                spicfg = &davinci_spi_default_cfg;
 
         davinci_spi_dma = &davinci_spi->dma_channels[spi->chip_select];
 
@@ -834,8 +841,8 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
                 return ret;
 
         /* Put delay val if required */
-        iowrite32(0 | (pdata->c2tdelay << SPI_C2TDELAY_SHIFT) |
-                        (pdata->t2cdelay << SPI_T2CDELAY_SHIFT),
+        iowrite32((spicfg->c2tdelay << SPI_C2TDELAY_SHIFT) |
+                        (spicfg->t2cdelay << SPI_T2CDELAY_SHIFT),
                         davinci_spi->base + SPIDELAY);
 
         count = davinci_spi->count;     /* the number of elements */