From bb39b8d99aae1f7eb13a97bd874838da91080de6 Mon Sep 17 00:00:00 2001
From: Florian Fainelli <florian@openwrt.org>
Date: Fri, 28 Feb 2014 20:30:08 +0000
Subject: brcm2708: update against latest rpi-3.10.y branch
Update our copies of the brcm2708 patches to the latest rpi-3.10-y
rebased against linux-3.10.y stable (3.10.32). This should hopefully
make it easier for us in the future to leverage the raspberry/rpi-*
branches.
Signed-off-by: Florian Fainelli <florian@openwrt.org>
SVN-Revision: 39770
---
...cm2708-add-9-bit-support-using-LoSSI-mode.patch | 67 ++++++++++++++++++++++
1 file changed, 67 insertions(+)
create mode 100644 target/linux/brcm2708/patches-3.10/0056-spi-bcm2708-add-9-bit-support-using-LoSSI-mode.patch
(limited to 'target/linux/brcm2708/patches-3.10/0056-spi-bcm2708-add-9-bit-support-using-LoSSI-mode.patch')
diff --git a/target/linux/brcm2708/patches-3.10/0056-spi-bcm2708-add-9-bit-support-using-LoSSI-mode.patch b/target/linux/brcm2708/patches-3.10/0056-spi-bcm2708-add-9-bit-support-using-LoSSI-mode.patch
new file mode 100644
index 0000000..d7ad5a2
--- /dev/null
+++ b/target/linux/brcm2708/patches-3.10/0056-spi-bcm2708-add-9-bit-support-using-LoSSI-mode.patch
@@ -0,0 +1,67 @@
+From 75c9b03f90ca974cb072d96f423884b773ca5425 Mon Sep 17 00:00:00 2001
+From: notro <notro@tronnes.org>
+Date: Sat, 26 Jan 2013 20:38:03 +0100
+Subject: [PATCH 056/174] spi-bcm2708: add 9-bit support using LoSSI mode
+
+---
+ drivers/spi/spi-bcm2708.c | 30 ++++++++++++++++++++++++++++--
+ 1 file changed, 28 insertions(+), 2 deletions(-)
+
+--- a/drivers/spi/spi-bcm2708.c
++++ b/drivers/spi/spi-bcm2708.c
+@@ -146,10 +146,31 @@ static inline void bcm2708_rd_fifo(struc
+ static inline void bcm2708_wr_fifo(struct bcm2708_spi *bs, int len)
+ {
+ u8 byte;
++ u16 val;
+
+ if (len > bs->len)
+ len = bs->len;
+
++ if (unlikely(bcm2708_rd(bs, SPI_CS) & SPI_CS_LEN)) {
++ /* LoSSI mode */
++ if (unlikely(len % 2)) {
++ printk(KERN_ERR"bcm2708_wr_fifo: length must be even, skipping.\n");
++ bs->len = 0;
++ return;
++ }
++ while (len) {
++ if (bs->tx_buf) {
++ val = *(const u16 *)bs->tx_buf;
++ bs->tx_buf += 2;
++ } else
++ val = 0;
++ bcm2708_wr(bs, SPI_FIFO, val);
++ bs->len -= 2;
++ len -= 2;
++ }
++ return;
++ }
++
+ while (len--) {
+ byte = bs->tx_buf ? *bs->tx_buf++ : 0;
+ bcm2708_wr(bs, SPI_FIFO, byte);
+@@ -234,8 +255,12 @@ static int bcm2708_setup_state(struct sp
+ switch (bpw) {
+ case 8:
+ break;
++ case 9:
++ /* Reading in LoSSI mode is a special case. See 'BCM2835 ARM Peripherals' datasheet */
++ cs |= SPI_CS_LEN;
++ break;
+ default:
+- dev_dbg(dev, "setup: invalid bits_per_word %u (must be 8)\n",
++ dev_dbg(dev, "setup: invalid bits_per_word %u (must be 8 or 9)\n",
+ bpw);
+ return -EINVAL;
+ }
+@@ -283,7 +308,8 @@ static int bcm2708_process_transfer(stru
+ ret = bcm2708_setup_state(spi->master, &spi->dev, &state,
+ xfer->speed_hz ? xfer->speed_hz : spi->max_speed_hz,
+ spi->chip_select, spi->mode,
+- spi->bits_per_word);
++ xfer->bits_per_word ? xfer->bits_per_word :
++ spi->bits_per_word);
+ if (ret)
+ return ret;
+
--
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