spi/spi-bcm2835: Split transfers that exceed DLEN

Split spi transfers into chunks of <=65532 to enable the driver to
perform DMA transfer on big buffers. The DLEN register specifies the
number of bytes to transfer in DMA mode. It is 16-bit wide and thus the
maximum DMA transfer is 65535 bytes. Set the maximum to 65532 (4 byte
aligned) since the FIFO in DMA mode is accessed in 4 byte chunks.

->max_dma_len is the value the spi core uses when splitting the buffer
into scatter gather entries.
The BCM2835 DMA block has 2 types of channels/engines:
- Normal: Max length: 1G
- Lite: Max length: 65535

Even when using a Lite channel we will not exceed the max length, so
let's drop setting ->max_dma_len.

Signed-off-by: Meghana Madhyastha <meghana.madhyastha@gmail.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index 35aebdf..8aa2271 100644 (file)
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -335,20 +335,6 @@ static int bcm2835_spi_transfer_one_irq(struct spi_master *master,
        return 1;
 }
 
-/*
- * DMA support
- *
- * this implementation has currently a few issues in so far as it does
- * not work arrount limitations of the HW.
- *
- * the main one being that DMA transfers are limited to 16 bit
- * (so 0 to 65535 bytes) by the SPI HW due to BCM2835_SPI_DLEN
- *
- * there may be a few more border-cases we may need to address as well
- * but unfortunately this would mean splitting up the scatter-gather
- * list making it slightly unpractical...
- */
-
 /**
  * bcm2835_spi_transfer_prologue() - transfer first few bytes without DMA
  * @master: SPI master
@@ -630,19 +616,6 @@ static bool bcm2835_spi_can_dma(struct spi_master *master,
        if (tfr->len < BCM2835_SPI_DMA_MIN_LENGTH)
                return false;
 
-       /* BCM2835_SPI_DLEN has defined a max transfer size as
-        * 16 bit, so max is 65535
-        * we can revisit this by using an alternative transfer
-        * method - ideally this would get done without any more
-        * interaction...
-        */
-       if (tfr->len > 65535) {
-               dev_warn_once(&spi->dev,
-                             "transfer size of %d too big for dma-transfer\n",
-                             tfr->len);
-               return false;
-       }
-
        /* return OK */
        return true;
 }
@@ -707,7 +680,6 @@ static void bcm2835_dma_init(struct spi_master *master, struct device *dev)
 
        /* all went well, so set can_dma */
        master->can_dma = bcm2835_spi_can_dma;
-       master->max_dma_len = 65535; /* limitation by BCM2835_SPI_DLEN */
        /* need to do TX AND RX DMA, so we need dummy buffers */
        master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX;
 
@@ -844,6 +816,17 @@ static int bcm2835_spi_prepare_message(struct spi_master *master,
        struct spi_device *spi = msg->spi;
        struct bcm2835_spi *bs = spi_master_get_devdata(master);
        u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
+       int ret;
+
+       /*
+        * DMA transfers are limited to 16 bit (0 to 65535 bytes) by the SPI HW
+        * due to DLEN. Split up transfers (32-bit FIFO aligned) if the limit is
+        * exceeded.
+        */
+       ret = spi_split_transfers_maxsize(master, msg, 65532,
+                                         GFP_KERNEL | GFP_DMA);
+       if (ret)
+               return ret;
 
        cs &= ~(BCM2835_SPI_CS_CPOL | BCM2835_SPI_CS_CPHA);