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Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6

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* 'next-spi' of git://git.secretlab.ca/git/linux-2.6:
  spi/amba_pl022: Fix probe and remove hook section annotations.
  spi/mpc5121: change annotations for probe and remove functions
  spi/bitbang: reinitialize transfer parameters for every message
  spi/spi-gpio: add support for controllers without MISO or MOSI pin
  spi/bitbang: add support for SPI_MASTER_NO_{TX, RX} modes
  SPI100k: Fix 8-bit and RX-only transfers
  spi/mmc_spi: mmc_spi adaptations for SPI bus locking API
  spi/mmc_spi: SPI bus locking API, using mutex

Fix trivial conflict in drivers/spi/mpc512x_psc_spi.c due to 'struct
of_device' => 'struct platform_device' rename and __init/__exit to
__devinit/__devexit fix.
This commit is contained in:
Linus Torvalds
2010-08-14 11:54:09 -07:00
parent 11ac552477 b4225885de
commit b171aa2770
14 changed files with 353 additions and 147 deletions
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59
drivers/mmc/host/mmc_spi.c
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@@ -182,7 +182,7 @@ mmc_spi_readbytes(struct mmc_spi_host *host, unsigned len)
host->data_dma, sizeof(*host->data),
DMA_FROM_DEVICE);
status = spi_sync(host->spi, &host->readback);
status = spi_sync_locked(host->spi, &host->readback);
if (host->dma_dev)
dma_sync_single_for_cpu(host->dma_dev,
@@ -541,7 +541,7 @@ mmc_spi_command_send(struct mmc_spi_host *host,
host->data_dma, sizeof(*host->data),
DMA_BIDIRECTIONAL);
}
status = spi_sync(host->spi, &host->m);
status = spi_sync_locked(host->spi, &host->m);
if (host->dma_dev)
dma_sync_single_for_cpu(host->dma_dev,
@@ -685,7 +685,7 @@ mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t,
host->data_dma, sizeof(*scratch),
DMA_BIDIRECTIONAL);
status = spi_sync(spi, &host->m);
status = spi_sync_locked(spi, &host->m);
if (status != 0) {
dev_dbg(&spi->dev, "write error (%d)\n", status);
@@ -822,7 +822,7 @@ mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t,
DMA_FROM_DEVICE);
}
status = spi_sync(spi, &host->m);
status = spi_sync_locked(spi, &host->m);
if (host->dma_dev) {
dma_sync_single_for_cpu(host->dma_dev,
@@ -1018,7 +1018,7 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
host->data_dma, sizeof(*scratch),
DMA_BIDIRECTIONAL);
tmp = spi_sync(spi, &host->m);
tmp = spi_sync_locked(spi, &host->m);
if (host->dma_dev)
dma_sync_single_for_cpu(host->dma_dev,
@@ -1084,6 +1084,9 @@ static void mmc_spi_request(struct mmc_host *mmc, struct mmc_request *mrq)
}
#endif
/* request exclusive bus access */
spi_bus_lock(host->spi->master);
/* issue command; then optionally data and stop */
status = mmc_spi_command_send(host, mrq, mrq->cmd, mrq->data != NULL);
if (status == 0 && mrq->data) {
@@ -1094,6 +1097,9 @@ static void mmc_spi_request(struct mmc_host *mmc, struct mmc_request *mrq)
mmc_cs_off(host);
}
/* release the bus */
spi_bus_unlock(host->spi->master);
mmc_request_done(host->mmc, mrq);
}
@@ -1290,23 +1296,6 @@ mmc_spi_detect_irq(int irq, void *mmc)
return IRQ_HANDLED;
}
struct count_children {
unsigned n;
struct bus_type *bus;
};
static int maybe_count_child(struct device *dev, void *c)
{
struct count_children *ccp = c;
if (dev->bus == ccp->bus) {
if (ccp->n)
return -EBUSY;
ccp->n++;
}
return 0;
}
static int mmc_spi_probe(struct spi_device *spi)
{
void *ones;
@@ -1338,32 +1327,6 @@ static int mmc_spi_probe(struct spi_device *spi)
return status;
}
/* We can use the bus safely iff nobody else will interfere with us.
* Most commands consist of one SPI message to issue a command, then
* several more to collect its response, then possibly more for data
* transfer. Clocking access to other devices during that period will
* corrupt the command execution.
*
* Until we have software primitives which guarantee non-interference,
* we'll aim for a hardware-level guarantee.
*
* REVISIT we can't guarantee another device won't be added later...
*/
if (spi->master->num_chipselect > 1) {
struct count_children cc;
cc.n = 0;
cc.bus = spi->dev.bus;
status = device_for_each_child(spi->dev.parent, &cc,
maybe_count_child);
if (status < 0) {
dev_err(&spi->dev, "can't share SPI bus\n");
return status;
}
dev_warn(&spi->dev, "ASSUMING SPI bus stays unshared!\n");
}
/* We need a supply of ones to transmit. This is the only time
* the CPU touches these, so cache coherency isn't a concern.
*