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spi: Updates for v3.10

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A few driver specific fixes plus improved error handling in the generic
 DT GPIO chipselect handling - not exciting but useful.
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Merge tag 'spi-v3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi updates from Mark Brown:
 "A few driver specific fixes plus improved error handling in the
  generic DT GPIO chipselect handling - not exciting but useful."

* tag 'spi-v3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi/spi-atmel: BUG: fix doesn' support 16 bits transfers using PIO
  spi/davinci: fix module build error
  spi: Return error from of_spi_register_master on bad "cs-gpios" property
  spi: Initialize cs_gpio and cs_gpios with -ENOENT
  spi/atmel: fix speed_hz check in atmel_spi_transfer()
This commit is contained in:
Linus Torvalds 2013-05-13 08:12:18 -07:00
commit 1f638766ff
4 changed files with 49 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
drivers/spi/spi-atmel.c
View File

@ -526,13 +526,17 @@ static void atmel_spi_next_xfer_pio(struct spi_master *master,
}
if (xfer->tx_buf)
spi_writel(as, TDR, *(u8 *)(xfer->tx_buf));
if (xfer->bits_per_word > 8)
spi_writel(as, TDR, *(u16 *)(xfer->tx_buf));
else
spi_writel(as, TDR, *(u8 *)(xfer->tx_buf));
else
spi_writel(as, TDR, 0);
dev_dbg(master->dev.parent,
" start pio xfer %p: len %u tx %p rx %p\n",
xfer, xfer->len, xfer->tx_buf, xfer->rx_buf);
" start pio xfer %p: len %u tx %p rx %p bitpw %d\n",
xfer, xfer->len, xfer->tx_buf, xfer->rx_buf,
xfer->bits_per_word);
/* Enable relevant interrupts */
spi_writel(as, IER, SPI_BIT(RDRF) | SPI_BIT(OVRES));
@ -950,21 +954,39 @@ atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
{
u8 *txp;
u8 *rxp;
u16 *txp16;
u16 *rxp16;
unsigned long xfer_pos = xfer->len - as->current_remaining_bytes;
if (xfer->rx_buf) {
rxp = ((u8 *)xfer->rx_buf) + xfer_pos;
*rxp = spi_readl(as, RDR);
if (xfer->bits_per_word > 8) {
rxp16 = (u16 *)(((u8 *)xfer->rx_buf) + xfer_pos);
*rxp16 = spi_readl(as, RDR);
} else {
rxp = ((u8 *)xfer->rx_buf) + xfer_pos;
*rxp = spi_readl(as, RDR);
}
} else {
spi_readl(as, RDR);
}
as->current_remaining_bytes--;
if (xfer->bits_per_word > 8) {
as->current_remaining_bytes -= 2;
if (as->current_remaining_bytes < 0)
as->current_remaining_bytes = 0;
} else {
as->current_remaining_bytes--;
}
if (as->current_remaining_bytes) {
if (xfer->tx_buf) {
txp = ((u8 *)xfer->tx_buf) + xfer_pos + 1;
spi_writel(as, TDR, *txp);
if (xfer->bits_per_word > 8) {
txp16 = (u16 *)(((u8 *)xfer->tx_buf)
+ xfer_pos + 2);
spi_writel(as, TDR, *txp16);
} else {
txp = ((u8 *)xfer->tx_buf) + xfer_pos + 1;
spi_writel(as, TDR, *txp);
}
} else {
spi_writel(as, TDR, 0);
}
@ -1378,9 +1400,16 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg)
}
}
if (xfer->bits_per_word > 8) {
if (xfer->len % 2) {
dev_dbg(&spi->dev, "buffer len should be 16 bits aligned\n");
return -EINVAL;
}
}
/* FIXME implement these protocol options!! */
if (xfer->speed_hz) {
dev_dbg(&spi->dev, "no protocol options yet\n");
if (xfer->speed_hz < spi->max_speed_hz) {
dev_dbg(&spi->dev, "can't change speed in transfer\n");
return -ENOPROTOOPT;
}

2
drivers/spi/spi-davinci.c
View File

@ -784,7 +784,7 @@ static const struct of_device_id davinci_spi_of_match[] = {
},
{ },
};
MODULE_DEVICE_TABLE(of, davini_spi_of_match);
MODULE_DEVICE_TABLE(of, davinci_spi_of_match);
/**
* spi_davinci_get_pdata - Get platform data from DTS binding

9
drivers/spi/spi.c
View File

@ -334,7 +334,7 @@ struct spi_device *spi_alloc_device(struct spi_master *master)
spi->dev.parent = &master->dev;
spi->dev.bus = &spi_bus_type;
spi->dev.release = spidev_release;
spi->cs_gpio = -EINVAL;
spi->cs_gpio = -ENOENT;
device_initialize(&spi->dev);
return spi;
}
@ -1067,8 +1067,11 @@ static int of_spi_register_master(struct spi_master *master)
nb = of_gpio_named_count(np, "cs-gpios");
master->num_chipselect = max(nb, (int)master->num_chipselect);
if (nb < 1)
/* Return error only for an incorrectly formed cs-gpios property */
if (nb == 0 || nb == -ENOENT)
return 0;
else if (nb < 0)
return nb;
cs = devm_kzalloc(&master->dev,
sizeof(int) * master->num_chipselect,
@ -1079,7 +1082,7 @@ static int of_spi_register_master(struct spi_master *master)
return -ENOMEM;
for (i = 0; i < master->num_chipselect; i++)
cs[i] = -EINVAL;
cs[i] = -ENOENT;
for (i = 0; i < nb; i++)
cs[i] = of_get_named_gpio(np, "cs-gpios", i);

4
include/linux/spi/spi.h
View File

@ -57,7 +57,7 @@ extern struct bus_type spi_bus_type;
* @modalias: Name of the driver to use with this device, or an alias
* for that name. This appears in the sysfs "modalias" attribute
* for driver coldplugging, and in uevents used for hotplugging
* @cs_gpio: gpio number of the chipselect line (optional, -EINVAL when
* @cs_gpio: gpio number of the chipselect line (optional, -ENOENT when
* when not using a GPIO line)
*
* A @spi_device is used to interchange data between an SPI slave
@ -266,7 +266,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* queue so the subsystem notifies the driver that it may relax the
* hardware by issuing this call
* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS
* number. Any individual value may be -EINVAL for CS lines that
* number. Any individual value may be -ENOENT for CS lines that
* are not GPIOs (driven by the SPI controller itself).
*
* Each SPI master controller can communicate with one or more @spi_device