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MIPS: BCM63xx: Fix SPI message control register handling for BCM6338/6348.

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BCM6338 and BCM6348 have a message control register width of 8 bits, instead
of 16-bits like what the SPI driver assumes right now. Also the SPI message
type shift value of 14 is actually 6 for these SoCs.
This resulted in transmit FIFO corruption because we were writing 16-bits
to an 8-bits wide register, thus spanning on the first byte of the transmit
FIFO, which had already been filed in bcm63xx_spi_fill_txrx_fifo().

Fix this by passing the message control register width and message type
shift through platform data back to the SPI driver so that it can use
it properly.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: grant.likely@secretlab.ca
Cc: spi-devel-general@lists.sourceforge.net
Cc: jonas.gorski@gmail.com
Patchwork: https://patchwork.linux-mips.org/patch/3983/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Florian Fainelli 2012-06-18 12:07:51 +02:00 committed by Ralf Baechle
parent c54de490a2
commit 5a6704454a
4 changed files with 41 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/mips/bcm63xx/dev-spi.c
View File

@ -106,11 +106,15 @@ int __init bcm63xx_spi_register(void)
if (BCMCPU_IS_6338() || BCMCPU_IS_6348()) {
spi_resources[0].end += BCM_6338_RSET_SPI_SIZE - 1;
spi_pdata.fifo_size = SPI_6338_MSG_DATA_SIZE;
spi_pdata.msg_type_shift = SPI_6338_MSG_TYPE_SHIFT;
spi_pdata.msg_ctl_width = SPI_6338_MSG_CTL_WIDTH;
}
if (BCMCPU_IS_6358() || BCMCPU_IS_6368()) {
spi_resources[0].end += BCM_6358_RSET_SPI_SIZE - 1;
spi_pdata.fifo_size = SPI_6358_MSG_DATA_SIZE;
spi_pdata.msg_type_shift = SPI_6358_MSG_TYPE_SHIFT;
spi_pdata.msg_ctl_width = SPI_6358_MSG_CTL_WIDTH;
}
bcm63xx_spi_regs_init();

2
arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_spi.h
View File

@ -9,6 +9,8 @@ int __init bcm63xx_spi_register(void);
struct bcm63xx_spi_pdata {
unsigned int fifo_size;
unsigned int msg_type_shift;
unsigned int msg_ctl_width;
int bus_num;
int num_chipselect;
u32 speed_hz;

13
arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
View File

@ -1054,7 +1054,8 @@
#define SPI_6338_FILL_BYTE 0x07
#define SPI_6338_MSG_TAIL 0x09
#define SPI_6338_RX_TAIL 0x0b
#define SPI_6338_MSG_CTL 0x40
#define SPI_6338_MSG_CTL 0x40 /* 8-bits register */
#define SPI_6338_MSG_CTL_WIDTH 8
#define SPI_6338_MSG_DATA 0x41
#define SPI_6338_MSG_DATA_SIZE 0x3f
#define SPI_6338_RX_DATA 0x80
@ -1070,7 +1071,8 @@
#define SPI_6348_FILL_BYTE 0x07
#define SPI_6348_MSG_TAIL 0x09
#define SPI_6348_RX_TAIL 0x0b
#define SPI_6348_MSG_CTL 0x40
#define SPI_6348_MSG_CTL 0x40 /* 8-bits register */
#define SPI_6348_MSG_CTL_WIDTH 8
#define SPI_6348_MSG_DATA 0x41
#define SPI_6348_MSG_DATA_SIZE 0x3f
#define SPI_6348_RX_DATA 0x80
@ -1078,6 +1080,7 @@
/* BCM 6358 SPI core */
#define SPI_6358_MSG_CTL 0x00 /* 16-bits register */
#define SPI_6358_MSG_CTL_WIDTH 16
#define SPI_6358_MSG_DATA 0x02
#define SPI_6358_MSG_DATA_SIZE 0x21e
#define SPI_6358_RX_DATA 0x400
@ -1094,6 +1097,7 @@
/* BCM 6358 SPI core */
#define SPI_6368_MSG_CTL 0x00 /* 16-bits register */
#define SPI_6368_MSG_CTL_WIDTH 16
#define SPI_6368_MSG_DATA 0x02
#define SPI_6368_MSG_DATA_SIZE 0x21e
#define SPI_6368_RX_DATA 0x400
@ -1115,7 +1119,10 @@
#define SPI_HD_W 0x01
#define SPI_HD_R 0x02
#define SPI_BYTE_CNT_SHIFT 0
#define SPI_MSG_TYPE_SHIFT 14
#define SPI_6338_MSG_TYPE_SHIFT 6
#define SPI_6348_MSG_TYPE_SHIFT 6
#define SPI_6358_MSG_TYPE_SHIFT 14
#define SPI_6368_MSG_TYPE_SHIFT 14
/* Command */
#define SPI_CMD_NOOP 0x00

27
drivers/spi/spi-bcm63xx.c
View File

@ -47,6 +47,8 @@ struct bcm63xx_spi {
/* Platform data */
u32 speed_hz;
unsigned fifo_size;
unsigned int msg_type_shift;
unsigned int msg_ctl_width;
/* Data buffers */
const unsigned char *tx_ptr;
@ -221,13 +223,20 @@ static unsigned int bcm63xx_txrx_bufs(struct spi_device *spi,
msg_ctl = (t->len << SPI_BYTE_CNT_SHIFT);
if (t->rx_buf && t->tx_buf)
msg_ctl |= (SPI_FD_RW << SPI_MSG_TYPE_SHIFT);
msg_ctl |= (SPI_FD_RW << bs->msg_type_shift);
else if (t->rx_buf)
msg_ctl |= (SPI_HD_R << SPI_MSG_TYPE_SHIFT);
msg_ctl |= (SPI_HD_R << bs->msg_type_shift);
else if (t->tx_buf)
msg_ctl |= (SPI_HD_W << SPI_MSG_TYPE_SHIFT);
msg_ctl |= (SPI_HD_W << bs->msg_type_shift);
switch (bs->msg_ctl_width) {
case 8:
bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL);
break;
case 16:
bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL);
break;
}
/* Issue the transfer */
cmd = SPI_CMD_START_IMMEDIATE;
@ -406,9 +415,21 @@ static int __devinit bcm63xx_spi_probe(struct platform_device *pdev)
master->transfer_one_message = bcm63xx_spi_transfer_one;
master->mode_bits = MODEBITS;
bs->speed_hz = pdata->speed_hz;
bs->msg_type_shift = pdata->msg_type_shift;
bs->msg_ctl_width = pdata->msg_ctl_width;
bs->tx_io = (u8 *)(bs->regs + bcm63xx_spireg(SPI_MSG_DATA));
bs->rx_io = (const u8 *)(bs->regs + bcm63xx_spireg(SPI_RX_DATA));
switch (bs->msg_ctl_width) {
case 8:
case 16:
break;
default:
dev_err(dev, "unsupported MSG_CTL width: %d\n",
bs->msg_ctl_width);
goto out_clk_disable;
}
/* Initialize hardware */
clk_enable(bs->clk);
bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);