Blackfin SPI driver: reconfigure speed_hz and bits_per_word in each spi transfer

 - reconfigure SPI baud from speed_hz of each spi transfer
 - according to spi_transfer.bits_per_word to reprogram register and setup
   correct SPI operation handlers

Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 45 insertions, 7 deletions

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index d6e9812538c4..22697b812205 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -234,10 +234,8 @@ static int restore_state(struct driver_data *drv_data)
         dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n");
 
         /* Load the registers */
-        write_BAUD(drv_data, chip->baud);
-        chip->ctl_reg &= (~BIT_CTL_TIMOD);
-        chip->ctl_reg |= (chip->width << 8);
         write_CTRL(drv_data, chip->ctl_reg);
+        write_BAUD(drv_data, chip->baud);
 
         bfin_spi_enable(drv_data);
         cs_active(drv_data, chip);
@@ -679,6 +677,7 @@ static void pump_transfers(unsigned long data)
         message = drv_data->cur_msg;
         transfer = drv_data->cur_transfer;
         chip = drv_data->cur_chip;
+
         /*
          * if msg is error or done, report it back using complete() callback
          */
@@ -736,15 +735,48 @@ static void pump_transfers(unsigned long data)
         drv_data->len_in_bytes = transfer->len;
         drv_data->cs_change = transfer->cs_change;
 
-        width = chip->width;
+        /* Bits per word setup */
+        switch (transfer->bits_per_word) {
+        case 8:
+                drv_data->n_bytes = 1;
+                width = CFG_SPI_WORDSIZE8;
+                drv_data->read = chip->cs_change_per_word ?
+                        u8_cs_chg_reader : u8_reader;
+                drv_data->write = chip->cs_change_per_word ?
+                        u8_cs_chg_writer : u8_writer;
+                drv_data->duplex = chip->cs_change_per_word ?
+                        u8_cs_chg_duplex : u8_duplex;
+                break;
+
+        case 16:
+                drv_data->n_bytes = 2;
+                width = CFG_SPI_WORDSIZE16;
+                drv_data->read = chip->cs_change_per_word ?
+                        u16_cs_chg_reader : u16_reader;
+                drv_data->write = chip->cs_change_per_word ?
+                        u16_cs_chg_writer : u16_writer;
+                drv_data->duplex = chip->cs_change_per_word ?
+                        u16_cs_chg_duplex : u16_duplex;
+                break;
+
+        default:
+                /* No change, the same as default setting */
+                drv_data->n_bytes = chip->n_bytes;
+                width = chip->width;
+                drv_data->write = drv_data->tx ? chip->write : null_writer;
+                drv_data->read = drv_data->rx ? chip->read : null_reader;
+                drv_data->duplex = chip->duplex ? chip->duplex : null_writer;
+                break;
+        }
+        cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD));
+        cr |= (width << 8);
+        write_CTRL(drv_data, cr);
+
         if (width == CFG_SPI_WORDSIZE16) {
                 drv_data->len = (transfer->len) >> 1;
         } else {
                 drv_data->len = transfer->len;
         }
-        drv_data->write = drv_data->tx ? chip->write : null_writer;
-        drv_data->read = drv_data->rx ? chip->read : null_reader;
-        drv_data->duplex = chip->duplex ? chip->duplex : null_writer;
         dev_dbg(&drv_data->pdev->dev, "transfer: ",
                 "drv_data->write is %p, chip->write is %p, null_wr is %p\n",
                 drv_data->write, chip->write, null_writer);
@@ -753,6 +785,12 @@ static void pump_transfers(unsigned long data)
         message->state = RUNNING_STATE;
         dma_config = 0;
 
+        /* Speed setup (surely valid because already checked) */
+        if (transfer->speed_hz)
+                write_BAUD(drv_data, hz_to_spi_baud(transfer->speed_hz));
+        else
+                write_BAUD(drv_data, chip->baud);
+
         write_STAT(drv_data, BIT_STAT_CLR);
         cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD));
         cs_active(drv_data, chip);