Merge branch 'spi/next' of git://git.secretlab.ca/git/linux-2.6

* 'spi/next' of git://git.secretlab.ca/git/linux-2.6:
  spi/amba-pl022: work in polling or interrupt mode if pl022_dma_probe fails
  spi/spi_s3c24xx: Use spi_bitbang_stop instead of spi_unregister_master in s3c24xx_spi_remove
  spi/spi_nuc900: Use spi_bitbang_stop instead of spi_unregister_master in nuc900_spi_remove
  spi/spi_tegra: use spi_unregister_master() instead of spi_master_put()
  spi/spi_sh: use spi_unregister_master instead of spi_master_put in remove path
  spi: Use void pointers for data in simple SPI I/O operations
  spi/pl022: use cpu_relax in the busy loop
  spi/pl022: mark driver non-experimental
  spi/pl022: timeout on polled transfer v2
  spi/dw_spi: improve the interrupt mode with the batch ops
  spi/dw_spi: change poll mode transfer from byte ops to batch ops
  spi/dw_spi: remove the un-necessary flush()
  spi/dw_spi: unify the low level read/write routines

drivers/spi/Kconfig

@@ -271,8 +271,8 @@ config SPI_ORION
 	  This enables using the SPI master controller on the Orion chips.
 
 config SPI_PL022
-	tristate "ARM AMBA PL022 SSP controller (EXPERIMENTAL)"
-	depends on ARM_AMBA && EXPERIMENTAL
+	tristate "ARM AMBA PL022 SSP controller"
+	depends on ARM_AMBA
 	default y if MACH_U300
 	default y if ARCH_REALVIEW
 	default y if INTEGRATOR_IMPD1

drivers/spi/amba-pl022.c

@@ -24,11 +24,6 @@
  * GNU General Public License for more details.
  */
 
-/*
- * TODO:
- * - add timeout on polled transfers
- */
-
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/device.h>
@@ -287,6 +282,8 @@
 
 #define CLEAR_ALL_INTERRUPTS  0x3
 
+#define SPI_POLLING_TIMEOUT 1000
+
 
 /*
  * The type of reading going on on this chip
@@ -1063,21 +1060,21 @@ static int __init pl022_dma_probe(struct pl022 *pl022)
 					    pl022->master_info->dma_filter,
 					    pl022->master_info->dma_rx_param);
 	if (!pl022->dma_rx_channel) {
-		dev_err(&pl022->adev->dev, "no RX DMA channel!\n");
+		dev_dbg(&pl022->adev->dev, "no RX DMA channel!\n");
 		goto err_no_rxchan;
 	}
 
 	pl022->dma_tx_channel = dma_request_channel(mask,
 					    pl022->master_info->dma_filter,
 					    pl022->master_info->dma_tx_param);
 	if (!pl022->dma_tx_channel) {
-		dev_err(&pl022->adev->dev, "no TX DMA channel!\n");
+		dev_dbg(&pl022->adev->dev, "no TX DMA channel!\n");
 		goto err_no_txchan;
 	}
 
 	pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL);
 	if (!pl022->dummypage) {
-		dev_err(&pl022->adev->dev, "no DMA dummypage!\n");
+		dev_dbg(&pl022->adev->dev, "no DMA dummypage!\n");
 		goto err_no_dummypage;
 	}
 
@@ -1093,6 +1090,8 @@ static int __init pl022_dma_probe(struct pl022 *pl022)
 	dma_release_channel(pl022->dma_rx_channel);
 	pl022->dma_rx_channel = NULL;
 err_no_rxchan:
+	dev_err(&pl022->adev->dev,
+			"Failed to work in dma mode, work without dma!\n");
 	return -ENODEV;
 }
 
@@ -1378,6 +1377,7 @@ static void do_polling_transfer(struct pl022 *pl022)
 	struct spi_transfer *transfer = NULL;
 	struct spi_transfer *previous = NULL;
 	struct chip_data *chip;
+	unsigned long time, timeout;
 
 	chip = pl022->cur_chip;
 	message = pl022->cur_msg;
@@ -1415,9 +1415,19 @@ static void do_polling_transfer(struct pl022 *pl022)
 		       SSP_CR1(pl022->virtbase));
 
 		dev_dbg(&pl022->adev->dev, "polling transfer ongoing ...\n");
-		/* FIXME: insert a timeout so we don't hang here indefinitely */
-		while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end)
+
+		timeout = jiffies + msecs_to_jiffies(SPI_POLLING_TIMEOUT);
+		while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end) {
+			time = jiffies;
 			readwriter(pl022);
+			if (time_after(time, timeout)) {
+				dev_warn(&pl022->adev->dev,
+				"%s: timeout!\n", __func__);
+				message->state = STATE_ERROR;
+				goto out;
+			}
+			cpu_relax();
+		}
 
 		/* Update total byte transferred */
 		message->actual_length += pl022->cur_transfer->len;
@@ -1426,7 +1436,7 @@ static void do_polling_transfer(struct pl022 *pl022)
 		/* Move to next transfer */
 		message->state = next_transfer(pl022);
 	}
-
+out:
 	/* Handle end of message */
 	if (message->state == STATE_DONE)
 		message->status = 0;
@@ -2107,7 +2117,7 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
 	if (platform_info->enable_dma) {
 		status = pl022_dma_probe(pl022);
 		if (status != 0)
-			goto err_no_dma;
+			platform_info->enable_dma = 0;
 	}
 
 	/* Initialize and start queue */
@@ -2143,7 +2153,6 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
  err_init_queue:
 	destroy_queue(pl022);
 	pl022_dma_remove(pl022);
- err_no_dma:
 	free_irq(adev->irq[0], pl022);
  err_no_irq:
 	clk_put(pl022->clk);