bcm63xx: fix spi transfer handling
* Accept transfers without bits_per_word set. * Work around the inability of the hardware of keeping CS asserted. Signed-off-by: Jonas Gorski <jogo@openwrt.org> SVN-Revision: 34320v19.07.3_mercusys_ac12_duma
Jonas Gorski
12 years ago
parent
2a01fa43a5
commit
1baeede939
@ -0,0 +1,29 @@
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From fbef4dff80be6254e36ab5b9c655d248a3991ded Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jonas.gorski@gmail.com>
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Date: Sat, 24 Nov 2012 12:08:22 +0100
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Subject: [PATCH 3.7] spi/bcm63xx: fix transfer bits_per_words check
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Transfers often do not have bits_per_words set, so use the spi device's
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bits_per_words in this case.
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This fixes the driver rejecting valid transfers e.g. generated by
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spi_write() or spi_read().
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Cc: stable@vger.kernel.org
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Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
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---
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drivers/spi/spi-bcm63xx.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/drivers/spi/spi-bcm63xx.c
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+++ b/drivers/spi/spi-bcm63xx.c
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@@ -103,7 +103,8 @@ static int bcm63xx_spi_check_transfer(st
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{
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u8 bits_per_word;
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- bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
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+ bits_per_word = (t && t->bits_per_word) ?
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+ t->bits_per_word : spi->bits_per_word;
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if (bits_per_word != 8) {
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dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
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__func__, bits_per_word);
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@ -0,0 +1,279 @@
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From 0f2ae1e1282ff64f74a5e36f7da874f94911225e Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jonas.gorski@gmail.com>
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Date: Wed, 14 Nov 2012 22:22:33 +0100
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Subject: [PATCH] spi/bcm63xx: fix multi transfer messages
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The BCM63XX SPI controller does not support keeping CS asserted after
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sending its buffer. This breaks common usages like spi_write_then_read,
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where it is expected to be kept active during the whole transfers.
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Work around this by combining the transfers into one if the buffer
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allows. For spi_write_then_read, use the prepend byte feature to write
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to "prepend" the write if it is less than 15 bytes, allowing the whole
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fifo size for the read.
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Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
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---
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Tested on a SPI conntected switch which required keeping CS active between
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the register read command and reading the register contents.
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Based on Mark's spi/next.
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Not sure if this is stable material, as it's quite invasive.
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drivers/spi/spi-bcm63xx.c | 172 ++++++++++++++++++++++++++++++---------------
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1 file changed, 117 insertions(+), 55 deletions(-)
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--- a/drivers/spi/spi-bcm63xx.c
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+++ b/drivers/spi/spi-bcm63xx.c
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@@ -38,6 +38,8 @@
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#define PFX KBUILD_MODNAME
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#define DRV_VER "0.1.2"
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+#define BCM63XX_SPI_MAX_PREPEND 15
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+
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struct bcm63xx_spi {
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struct completion done;
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@@ -50,16 +52,10 @@ struct bcm63xx_spi {
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unsigned int msg_type_shift;
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unsigned int msg_ctl_width;
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- /* Data buffers */
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- const unsigned char *tx_ptr;
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- unsigned char *rx_ptr;
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-
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/* data iomem */
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u8 __iomem *tx_io;
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const u8 __iomem *rx_io;
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- int remaining_bytes;
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-
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struct clk *clk;
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struct platform_device *pdev;
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};
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@@ -184,50 +180,60 @@ static int bcm63xx_spi_setup(struct spi_
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return 0;
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}
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-/* Fill the TX FIFO with as many bytes as possible */
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-static void bcm63xx_spi_fill_tx_fifo(struct bcm63xx_spi *bs)
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-{
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- u8 size;
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-
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- /* Fill the Tx FIFO with as many bytes as possible */
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- size = bs->remaining_bytes < bs->fifo_size ? bs->remaining_bytes :
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- bs->fifo_size;
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- memcpy_toio(bs->tx_io, bs->tx_ptr, size);
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- bs->remaining_bytes -= size;
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-}
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-
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static unsigned int bcm63xx_txrx_bufs(struct spi_device *spi,
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- struct spi_transfer *t)
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+ struct spi_transfer *first,
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+ unsigned int n_transfers)
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{
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struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
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u16 msg_ctl;
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u16 cmd;
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+ unsigned int i, timeout, total_len = 0, prepend_len = 0, len = 0;
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+ struct spi_transfer *t = first;
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+ u8 rx_tail;
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+ bool do_rx = false;
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+ bool do_tx = false;
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/* Disable the CMD_DONE interrupt */
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bcm_spi_writeb(bs, 0, SPI_INT_MASK);
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- dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
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- t->tx_buf, t->rx_buf, t->len);
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+ if (n_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND)
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+ prepend_len = t->len;
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+
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+ /* prepare the buffer */
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+ for (i = 0; i < n_transfers; i++) {
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+ if (t->tx_buf) {
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+ do_tx = true;
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+ memcpy_toio(bs->tx_io + total_len, t->tx_buf, t->len);
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+
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+ /* don't prepend more than one tx */
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+ if (t != first)
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+ prepend_len = 0;
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+ }
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+
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+ if (t->rx_buf) {
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+ do_rx = true;
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+ if (t == first)
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+ prepend_len = 0;
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+ }
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- /* Transmitter is inhibited */
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- bs->tx_ptr = t->tx_buf;
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- bs->rx_ptr = t->rx_buf;
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-
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- if (t->tx_buf) {
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- bs->remaining_bytes = t->len;
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- bcm63xx_spi_fill_tx_fifo(bs);
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+ total_len += t->len;
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+
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+ t = list_entry(t->transfer_list.next, struct spi_transfer,
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+ transfer_list);
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}
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+ len = total_len - prepend_len;
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+
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init_completion(&bs->done);
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/* Fill in the Message control register */
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- msg_ctl = (t->len << SPI_BYTE_CNT_SHIFT);
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+ msg_ctl = (len << SPI_BYTE_CNT_SHIFT);
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- if (t->rx_buf && t->tx_buf)
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+ if (do_rx && do_tx && prepend_len == 0)
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msg_ctl |= (SPI_FD_RW << bs->msg_type_shift);
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- else if (t->rx_buf)
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+ else if (do_rx)
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msg_ctl |= (SPI_HD_R << bs->msg_type_shift);
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- else if (t->tx_buf)
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+ else if (do_tx)
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msg_ctl |= (SPI_HD_W << bs->msg_type_shift);
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switch (bs->msg_ctl_width) {
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@@ -245,14 +251,41 @@ static unsigned int bcm63xx_txrx_bufs(st
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/* Issue the transfer */
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cmd = SPI_CMD_START_IMMEDIATE;
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- cmd |= (0 << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
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+ cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
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cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT);
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bcm_spi_writew(bs, cmd, SPI_CMD);
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/* Enable the CMD_DONE interrupt */
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bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
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- return t->len - bs->remaining_bytes;
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+ timeout = wait_for_completion_timeout(&bs->done, HZ);
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+ if (!timeout)
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+ return -ETIMEDOUT;
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+
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+ /* read out all data */
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+ rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL);
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+
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+ if (do_rx && rx_tail != len)
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+ return -EINVAL;
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+
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+ if (!rx_tail)
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+ return total_len;
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+
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+ len = 0;
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+ t = first;
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+ /* Read out all the data */
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+ for (i = 0; i < n_transfers; i++) {
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+ if (t->rx_buf)
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+ memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len);
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+
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+ if (t != first || prepend_len == 0)
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+ len += t->len;
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+
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+ t = list_entry(t->transfer_list.next, struct spi_transfer,
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+ transfer_list);
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+ }
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+
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+ return total_len;
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}
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static int bcm63xx_spi_prepare_transfer(struct spi_master *master)
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@@ -277,42 +310,71 @@ static int bcm63xx_spi_transfer_one(stru
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struct spi_message *m)
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{
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struct bcm63xx_spi *bs = spi_master_get_devdata(master);
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- struct spi_transfer *t;
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+ struct spi_transfer *t, *first = NULL;
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struct spi_device *spi = m->spi;
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int status = 0;
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- unsigned int timeout = 0;
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+ unsigned int n_transfers = 0, total_len = 0;
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+ bool can_use_prepend = false;
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+ /*
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+ * This SPI controller does not support keeping CS active after a
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+ * transfer, so we need to combine the transfers into one until we may
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+ * deassert CS.
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+ */
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list_for_each_entry(t, &m->transfers, transfer_list) {
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- unsigned int len = t->len;
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- u8 rx_tail;
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-
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status = bcm63xx_spi_check_transfer(spi, t);
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if (status < 0)
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goto exit;
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- /* configure adapter for a new transfer */
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- bcm63xx_spi_setup_transfer(spi, t);
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+ if (!first)
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+ first = t;
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- while (len) {
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- /* send the data */
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- len -= bcm63xx_txrx_bufs(spi, t);
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-
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- timeout = wait_for_completion_timeout(&bs->done, HZ);
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- if (!timeout) {
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- status = -ETIMEDOUT;
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- goto exit;
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- }
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+ n_transfers++;
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+ total_len += t->len;
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+
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+ if (n_transfers == 2 && !first->rx_buf && !t->tx_buf &&
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+ first->len <= BCM63XX_SPI_MAX_PREPEND)
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+ can_use_prepend = true;
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+ else if (can_use_prepend && t->tx_buf)
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+ can_use_prepend = false;
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+
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+ if ((can_use_prepend &&
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+ total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) ||
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+ (!can_use_prepend && total_len > bs->fifo_size)) {
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+ status = -EINVAL;
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+ goto exit;
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+ }
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- /* read out all data */
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- rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL);
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+ /* all transfers have to be made at the same speed */
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+ if (t->speed_hz != first->speed_hz) {
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+ status = -EINVAL;
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+ goto exit;
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+ }
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- /* Read out all the data */
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- if (rx_tail)
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- memcpy_fromio(bs->rx_ptr, bs->rx_io, rx_tail);
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+ /* CS will be deasserted directly after the transfer */
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+ if (t->delay_usecs) {
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+ status = -EINVAL;
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+ goto exit;
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}
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- m->actual_length += t->len;
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+ if (t->cs_change ||
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+ list_is_last(&t->transfer_list, &m->transfers)) {
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+ /* configure adapter for a new transfer */
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+ bcm63xx_spi_setup_transfer(spi, first);
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+
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+ status = bcm63xx_txrx_bufs(spi, first, n_transfers);
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+ if (status < 0)
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+ goto exit;
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+
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+ m->actual_length += status;
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+ first = NULL;
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+ status = 0;
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+ n_transfers = 0;
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+ total_len = 0;
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+ can_use_prepend = false;
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+ }
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}
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+
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exit:
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m->status = status;
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spi_finalize_current_message(master);
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@ -0,0 +1,29 @@
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From fbef4dff80be6254e36ab5b9c655d248a3991ded Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jonas.gorski@gmail.com>
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Date: Sat, 24 Nov 2012 12:08:22 +0100
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Subject: [PATCH 3.7] spi/bcm63xx: fix transfer bits_per_words check
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Transfers often do not have bits_per_words set, so use the spi device's
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bits_per_words in this case.
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This fixes the driver rejecting valid transfers e.g. generated by
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spi_write() or spi_read().
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Cc: stable@vger.kernel.org
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Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
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---
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drivers/spi/spi-bcm63xx.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/drivers/spi/spi-bcm63xx.c
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+++ b/drivers/spi/spi-bcm63xx.c
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@@ -103,7 +103,8 @@ static int bcm63xx_spi_check_transfer(st
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{
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u8 bits_per_word;
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- bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
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+ bits_per_word = (t && t->bits_per_word) ?
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+ t->bits_per_word : spi->bits_per_word;
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if (bits_per_word != 8) {
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dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
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__func__, bits_per_word);
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@ -0,0 +1,279 @@
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From 0f2ae1e1282ff64f74a5e36f7da874f94911225e Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jonas.gorski@gmail.com>
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Date: Wed, 14 Nov 2012 22:22:33 +0100
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Subject: [PATCH] spi/bcm63xx: fix multi transfer messages
|
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|
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The BCM63XX SPI controller does not support keeping CS asserted after
|
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sending its buffer. This breaks common usages like spi_write_then_read,
|
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where it is expected to be kept active during the whole transfers.
|
||||
|
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Work around this by combining the transfers into one if the buffer
|
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allows. For spi_write_then_read, use the prepend byte feature to write
|
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to "prepend" the write if it is less than 15 bytes, allowing the whole
|
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fifo size for the read.
|
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|
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Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
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---
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Tested on a SPI conntected switch which required keeping CS active between
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the register read command and reading the register contents.
|
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|
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Based on Mark's spi/next.
|
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|
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Not sure if this is stable material, as it's quite invasive.
|
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|
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drivers/spi/spi-bcm63xx.c | 172 ++++++++++++++++++++++++++++++---------------
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1 file changed, 117 insertions(+), 55 deletions(-)
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--- a/drivers/spi/spi-bcm63xx.c
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+++ b/drivers/spi/spi-bcm63xx.c
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@@ -38,6 +38,8 @@
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#define PFX KBUILD_MODNAME
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#define DRV_VER "0.1.2"
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+#define BCM63XX_SPI_MAX_PREPEND 15
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+
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struct bcm63xx_spi {
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struct completion done;
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@@ -50,16 +52,10 @@ struct bcm63xx_spi {
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unsigned int msg_type_shift;
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unsigned int msg_ctl_width;
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- /* Data buffers */
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- const unsigned char *tx_ptr;
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- unsigned char *rx_ptr;
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-
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/* data iomem */
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u8 __iomem *tx_io;
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const u8 __iomem *rx_io;
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- int remaining_bytes;
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-
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struct clk *clk;
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struct platform_device *pdev;
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};
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@@ -184,50 +180,60 @@ static int bcm63xx_spi_setup(struct spi_
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return 0;
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}
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-/* Fill the TX FIFO with as many bytes as possible */
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-static void bcm63xx_spi_fill_tx_fifo(struct bcm63xx_spi *bs)
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-{
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- u8 size;
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-
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- /* Fill the Tx FIFO with as many bytes as possible */
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- size = bs->remaining_bytes < bs->fifo_size ? bs->remaining_bytes :
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- bs->fifo_size;
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- memcpy_toio(bs->tx_io, bs->tx_ptr, size);
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- bs->remaining_bytes -= size;
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-}
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-
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static unsigned int bcm63xx_txrx_bufs(struct spi_device *spi,
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- struct spi_transfer *t)
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+ struct spi_transfer *first,
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+ unsigned int n_transfers)
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{
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struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
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u16 msg_ctl;
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u16 cmd;
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+ unsigned int i, timeout, total_len = 0, prepend_len = 0, len = 0;
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+ struct spi_transfer *t = first;
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+ u8 rx_tail;
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+ bool do_rx = false;
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+ bool do_tx = false;
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/* Disable the CMD_DONE interrupt */
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bcm_spi_writeb(bs, 0, SPI_INT_MASK);
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- dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
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- t->tx_buf, t->rx_buf, t->len);
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+ if (n_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND)
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+ prepend_len = t->len;
|
||||
+
|
||||
+ /* prepare the buffer */
|
||||
+ for (i = 0; i < n_transfers; i++) {
|
||||
+ if (t->tx_buf) {
|
||||
+ do_tx = true;
|
||||
+ memcpy_toio(bs->tx_io + total_len, t->tx_buf, t->len);
|
||||
+
|
||||
+ /* don't prepend more than one tx */
|
||||
+ if (t != first)
|
||||
+ prepend_len = 0;
|
||||
+ }
|
||||
+
|
||||
+ if (t->rx_buf) {
|
||||
+ do_rx = true;
|
||||
+ if (t == first)
|
||||
+ prepend_len = 0;
|
||||
+ }
|
||||
|
||||
- /* 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);
|
||||
+ total_len += t->len;
|
||||
+
|
||||
+ t = list_entry(t->transfer_list.next, struct spi_transfer,
|
||||
+ transfer_list);
|
||||
}
|
||||
|
||||
+ len = total_len - prepend_len;
|
||||
+
|
||||
init_completion(&bs->done);
|
||||
|
||||
/* Fill in the Message control register */
|
||||
- msg_ctl = (t->len << SPI_BYTE_CNT_SHIFT);
|
||||
+ msg_ctl = (len << SPI_BYTE_CNT_SHIFT);
|
||||
|
||||
- if (t->rx_buf && t->tx_buf)
|
||||
+ if (do_rx && do_tx && prepend_len == 0)
|
||||
msg_ctl |= (SPI_FD_RW << bs->msg_type_shift);
|
||||
- else if (t->rx_buf)
|
||||
+ else if (do_rx)
|
||||
msg_ctl |= (SPI_HD_R << bs->msg_type_shift);
|
||||
- else if (t->tx_buf)
|
||||
+ else if (do_tx)
|
||||
msg_ctl |= (SPI_HD_W << bs->msg_type_shift);
|
||||
|
||||
switch (bs->msg_ctl_width) {
|
||||
@@ -241,14 +247,41 @@ static unsigned int bcm63xx_txrx_bufs(st
|
||||
|
||||
/* Issue the transfer */
|
||||
cmd = SPI_CMD_START_IMMEDIATE;
|
||||
- cmd |= (0 << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
|
||||
+ cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
|
||||
cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT);
|
||||
bcm_spi_writew(bs, cmd, SPI_CMD);
|
||||
|
||||
/* 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);
|
||||
+
|
||||
+ if (do_rx && rx_tail != len)
|
||||
+ return -EINVAL;
|
||||
+
|
||||
+ if (!rx_tail)
|
||||
+ return total_len;
|
||||
+
|
||||
+ len = 0;
|
||||
+ t = first;
|
||||
+ /* Read out all the data */
|
||||
+ for (i = 0; i < n_transfers; i++) {
|
||||
+ if (t->rx_buf)
|
||||
+ memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len);
|
||||
+
|
||||
+ if (t != first || prepend_len == 0)
|
||||
+ len += t->len;
|
||||
+
|
||||
+ t = list_entry(t->transfer_list.next, struct spi_transfer,
|
||||
+ transfer_list);
|
||||
+ }
|
||||
+
|
||||
+ return total_len;
|
||||
}
|
||||
|
||||
static int bcm63xx_spi_prepare_transfer(struct spi_master *master)
|
||||
@@ -273,42 +306,71 @@ static int bcm63xx_spi_transfer_one(stru
|
||||
struct spi_message *m)
|
||||
{
|
||||
struct bcm63xx_spi *bs = spi_master_get_devdata(master);
|
||||
- struct spi_transfer *t;
|
||||
+ struct spi_transfer *t, *first = NULL;
|
||||
struct spi_device *spi = m->spi;
|
||||
int status = 0;
|
||||
- unsigned int timeout = 0;
|
||||
+ unsigned int n_transfers = 0, total_len = 0;
|
||||
+ bool can_use_prepend = false;
|
||||
|
||||
+ /*
|
||||
+ * This SPI controller does not support keeping CS active after a
|
||||
+ * transfer, so we need to combine the transfers into one until we may
|
||||
+ * deassert CS.
|
||||
+ */
|
||||
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;
|
||||
|
||||
- /* configure adapter for a new transfer */
|
||||
- bcm63xx_spi_setup_transfer(spi, t);
|
||||
+ if (!first)
|
||||
+ first = 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;
|
||||
- }
|
||||
+ n_transfers++;
|
||||
+ total_len += t->len;
|
||||
+
|
||||
+ if (n_transfers == 2 && !first->rx_buf && !t->tx_buf &&
|
||||
+ first->len <= BCM63XX_SPI_MAX_PREPEND)
|
||||
+ can_use_prepend = true;
|
||||
+ else if (can_use_prepend && t->tx_buf)
|
||||
+ can_use_prepend = false;
|
||||
+
|
||||
+ if ((can_use_prepend &&
|
||||
+ total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) ||
|
||||
+ (!can_use_prepend && total_len > bs->fifo_size)) {
|
||||
+ status = -EINVAL;
|
||||
+ goto exit;
|
||||
+ }
|
||||
|
||||
- /* read out all data */
|
||||
- rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL);
|
||||
+ /* all transfers have to be made at the same speed */
|
||||
+ if (t->speed_hz != first->speed_hz) {
|
||||
+ status = -EINVAL;
|
||||
+ goto exit;
|
||||
+ }
|
||||
|
||||
- /* Read out all the data */
|
||||
- if (rx_tail)
|
||||
- memcpy_fromio(bs->rx_ptr, bs->rx_io, rx_tail);
|
||||
+ /* CS will be deasserted directly after the transfer */
|
||||
+ if (t->delay_usecs) {
|
||||
+ status = -EINVAL;
|
||||
+ goto exit;
|
||||
}
|
||||
|
||||
- m->actual_length += t->len;
|
||||
+ if (t->cs_change ||
|
||||
+ list_is_last(&t->transfer_list, &m->transfers)) {
|
||||
+ /* configure adapter for a new transfer */
|
||||
+ bcm63xx_spi_setup_transfer(spi, first);
|
||||
+
|
||||
+ status = bcm63xx_txrx_bufs(spi, first, n_transfers);
|
||||
+ if (status < 0)
|
||||
+ goto exit;
|
||||
+
|
||||
+ m->actual_length += status;
|
||||
+ first = NULL;
|
||||
+ status = 0;
|
||||
+ n_transfers = 0;
|
||||
+ total_len = 0;
|
||||
+ can_use_prepend = false;
|
||||
+ }
|
||||
}
|
||||
+
|
||||
exit:
|
||||
m->status = status;
|
||||
spi_finalize_current_message(master);
|
||||
Loading…
Reference in New Issue