spi: orion: Change spi-orion to use transfer_one() semantics for SPI transfers

This commit changes spi-orion to provide setup, set_cs, and transfer_one
functions instead of transfer_one_message. This allows chip select support
for both native and GPIO chip selects to be added.

Signed-off-by: Ken Wilson <ken.wilson@opengear.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c
index 3dec9e0..98f1a84 100644 (file)
--- a/drivers/spi/spi-orion.c
+++ b/drivers/spi/spi-orion.c
@@ -215,9 +215,14 @@ orion_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
        return 0;
 }
 
-static void orion_spi_set_cs(struct orion_spi *orion_spi, int enable)
+static void orion_spi_set_cs(struct spi_device *spi, bool enable)
 {
-       if (enable)
+       struct orion_spi *orion_spi;
+
+       orion_spi = spi_master_get_devdata(spi->master);
+
+       /* Chip select logic is inverted from spi_set_cs */
+       if (!enable)
                orion_spi_setbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
        else
                orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
@@ -332,64 +337,31 @@ out:
        return xfer->len - count;
 }
 
-static int orion_spi_transfer_one_message(struct spi_master *master,
-                                          struct spi_message *m)
+static int orion_spi_transfer_one(struct spi_master *master,
+                                       struct spi_device *spi,
+                                       struct spi_transfer *t)
 {
-       struct orion_spi *orion_spi = spi_master_get_devdata(master);
-       struct spi_device *spi = m->spi;
-       struct spi_transfer *t = NULL;
-       int par_override = 0;
        int status = 0;
-       int cs_active = 0;
-
-       /* Load defaults */
-       status = orion_spi_setup_transfer(spi, NULL);
 
+       status = orion_spi_setup_transfer(spi, t);
        if (status < 0)
-               goto msg_done;
-
-       list_for_each_entry(t, &m->transfers, transfer_list) {
-               if (par_override || t->speed_hz || t->bits_per_word) {
-                       par_override = 1;
-                       status = orion_spi_setup_transfer(spi, t);
-                       if (status < 0)
-                               break;
-                       if (!t->speed_hz && !t->bits_per_word)
-                               par_override = 0;
-               }
-
-               if (!cs_active) {
-                       orion_spi_set_cs(orion_spi, 1);
-                       cs_active = 1;
-               }
+               return status;
 
-               if (t->len)
-                       m->actual_length += orion_spi_write_read(spi, t);
+       if (t->len)
+               orion_spi_write_read(spi, t);
 
-               if (t->delay_usecs)
-                       udelay(t->delay_usecs);
-
-               if (t->cs_change) {
-                       orion_spi_set_cs(orion_spi, 0);
-                       cs_active = 0;
-               }
-       }
-
-msg_done:
-       if (cs_active)
-               orion_spi_set_cs(orion_spi, 0);
-
-       m->status = status;
-       spi_finalize_current_message(master);
+       return status;
+}
 
-       return 0;
+static int orion_spi_setup(struct spi_device *spi)
+{
+       return orion_spi_setup_transfer(spi, NULL);
 }
 
 static int orion_spi_reset(struct orion_spi *orion_spi)
 {
        /* Verify that the CS is deasserted */
-       orion_spi_set_cs(orion_spi, 0);
-
+       orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
        return 0;
 }
 
@@ -442,9 +414,10 @@ static int orion_spi_probe(struct platform_device *pdev)
 
        /* we support only mode 0, and no options */
        master->mode_bits = SPI_CPHA | SPI_CPOL;
-
-       master->transfer_one_message = orion_spi_transfer_one_message;
+       master->set_cs = orion_spi_set_cs;
+       master->transfer_one = orion_spi_transfer_one;
        master->num_chipselect = ORION_NUM_CHIPSELECTS;
+       master->setup = orion_spi_setup;
        master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
        master->auto_runtime_pm = true;