bcm63xx: add support for linux 3.8

Based on 3.8-rc6

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 35482

1 files changed, 162 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-3.8/106-spi-bcm63xx-reject-transfers-unable-to-transfer.patch b/target/linux/brcm63xx/patches-3.8/106-spi-bcm63xx-reject-transfers-unable-to-transfer.patch
new file mode 100644
index 0000000000..8726b19e0d
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.8/106-spi-bcm63xx-reject-transfers-unable-to-transfer.patch
@@ -0,0 +1,162 @@
+From 243970ea035623f70431a80ece802f572cd446be Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Sun, 9 Dec 2012 00:10:00 +0100
+Subject: [PATCH V2 1/2] spi/bcm63xx: reject transfers unable to transfer
+
+The hardware does not support keeping CS asserted after sending one
+FIFO buffer worth of data, so reject transfers requiring CS being kept
+asserted, either between transers or for a certain time after it,
+or exceeding the FIFO size.
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ drivers/spi/spi-bcm63xx.c |   91 +++++++++++++++++++++------------------------
+ 1 file changed, 42 insertions(+), 49 deletions(-)
+
+--- a/drivers/spi/spi-bcm63xx.c
++++ b/drivers/spi/spi-bcm63xx.c
+@@ -49,16 +49,10 @@ struct bcm63xx_spi {
+ 	unsigned int		msg_type_shift;
+ 	unsigned int		msg_ctl_width;
+ 
+-	/* Data buffers */
+-	const unsigned char	*tx_ptr;
+-	unsigned char		*rx_ptr;
+-
+ 	/* data iomem */
+ 	u8 __iomem		*tx_io;
+ 	const u8 __iomem	*rx_io;
+ 
+-	int			remaining_bytes;
+-
+ 	struct clk		*clk;
+ 	struct platform_device	*pdev;
+ };
+@@ -175,24 +169,13 @@ static int bcm63xx_spi_setup(struct spi_
+ 	return 0;
+ }
+ 
+-/* Fill the TX FIFO with as many bytes as possible */
+-static void bcm63xx_spi_fill_tx_fifo(struct bcm63xx_spi *bs)
+-{
+-	u8 size;
+-
+-	/* Fill the Tx FIFO with as many bytes as possible */
+-	size = bs->remaining_bytes < bs->fifo_size ? bs->remaining_bytes :
+-		bs->fifo_size;
+-	memcpy_toio(bs->tx_io, bs->tx_ptr, size);
+-	bs->remaining_bytes -= size;
+-}
+-
+-static unsigned int bcm63xx_txrx_bufs(struct spi_device *spi,
+-					struct spi_transfer *t)
++static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
+ {
+ 	struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
+ 	u16 msg_ctl;
+ 	u16 cmd;
++	u8 rx_tail;
++	unsigned int timeout = 0;
+ 
+ 	/* Disable the CMD_DONE interrupt */
+ 	bcm_spi_writeb(bs, 0, SPI_INT_MASK);
+@@ -200,14 +183,8 @@ static unsigned int bcm63xx_txrx_bufs(st
+ 	dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
+ 		t->tx_buf, t->rx_buf, t->len);
+ 
+-	/* Transmitter is inhibited */
+-	bs->tx_ptr = t->tx_buf;
+-	bs->rx_ptr = t->rx_buf;
+-
+-	if (t->tx_buf) {
+-		bs->remaining_bytes = t->len;
+-		bcm63xx_spi_fill_tx_fifo(bs);
+-	}
++	if (t->tx_buf)
++		memcpy_toio(bs->tx_io, t->tx_buf, t->len);
+ 
+ 	init_completion(&bs->done);
+ 
+@@ -239,7 +216,18 @@ static unsigned int bcm63xx_txrx_bufs(st
+ 	/* Enable the CMD_DONE interrupt */
+ 	bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
+ 
+-	return t->len - bs->remaining_bytes;
++	timeout = wait_for_completion_timeout(&bs->done, HZ);
++	if (!timeout)
++		return -ETIMEDOUT;
++
++	/* read out all data */
++	rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL);
++
++	/* Read out all the data */
++	if (rx_tail)
++		memcpy_fromio(t->rx_ptr, bs->rx_io, rx_tail);
++
++	return 0;
+ }
+ 
+ static int bcm63xx_spi_prepare_transfer(struct spi_master *master)
+@@ -267,36 +255,41 @@ static int bcm63xx_spi_transfer_one(stru
+ 	struct spi_transfer *t;
+ 	struct spi_device *spi = m->spi;
+ 	int status = 0;
+-	unsigned int timeout = 0;
+ 
+ 	list_for_each_entry(t, &m->transfers, transfer_list) {
+-		unsigned int len = t->len;
+-		u8 rx_tail;
+-
+ 		status = bcm63xx_spi_check_transfer(spi, t);
+ 		if (status < 0)
+ 			goto exit;
+ 
++		/* we can only transfer one fifo worth of data */
++		if (t->len > bs->fifo_size) {
++			dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n",
++				t->len, bs->fifo_size);
++			status = -EINVAL;
++			goto exit;
++		}
++
++		/* CS will be deasserted directly after transfer */
++		if (t->delay_usecs) {
++			dev_err(&spi->dev, "unable to keep CS asserted after transfer\n");
++			status = -EINVAL;
++			goto exit;
++		}
++
++		if (!t->cs_change &&
++		    !list_is_last(&t->transfer_list, &m->transfers)) {
++			dev_err(&spi->dev, "unable to keep CS asserted between transfers\n");
++			status = -EINVAL;
++			goto exit;
++		}
++
+ 		/* configure adapter for a new transfer */
+ 		bcm63xx_spi_setup_transfer(spi, t);
+ 
+-		while (len) {
+-			/* send the data */
+-			len -= bcm63xx_txrx_bufs(spi, t);
+-
+-			timeout = wait_for_completion_timeout(&bs->done, HZ);
+-			if (!timeout) {
+-				status = -ETIMEDOUT;
+-				goto exit;
+-			}
+-
+-			/* read out all data */
+-			rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL);
+-
+-			/* Read out all the data */
+-			if (rx_tail)
+-				memcpy_fromio(bs->rx_ptr, bs->rx_io, rx_tail);
+-		}
++		/* send the data */
++		status = bcm63xx_txrx_bufs(spi, t);
++		if (status)
++			goto exit;
+ 
+ 		m->actual_length += t->len;
+ 	}