Commit 7a3eff4c authored by Peng Fan's avatar Peng Fan Committed by Simon Glass

dm: spi: introduce dm api

Introduce dm_spi_claim_bus, dm_spi_release_bus and dm_spi_xfer
Convert spi_claim_bus, spi_release_bus and spi_xfer to use
the new API.
Signed-off-by: default avatarPeng Fan <van.freenix@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Jagan Teki <jteki@openedev.com>
Acked-by: default avatarSimon Glass <sjg@chromium.org>
parent 102412c4
......@@ -45,12 +45,12 @@ static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
return 0;
}
int spi_claim_bus(struct spi_slave *slave)
int dm_spi_claim_bus(struct udevice *dev)
{
struct udevice *dev = slave->dev;
struct udevice *bus = dev->parent;
struct dm_spi_ops *ops = spi_get_ops(bus);
struct dm_spi_bus *spi = dev_get_uclass_priv(bus);
struct spi_slave *slave = dev_get_parent_priv(dev);
int speed;
int ret;
......@@ -73,9 +73,8 @@ int spi_claim_bus(struct spi_slave *slave)
return ops->claim_bus ? ops->claim_bus(dev) : 0;
}
void spi_release_bus(struct spi_slave *slave)
void dm_spi_release_bus(struct udevice *dev)
{
struct udevice *dev = slave->dev;
struct udevice *bus = dev->parent;
struct dm_spi_ops *ops = spi_get_ops(bus);
......@@ -83,10 +82,9 @@ void spi_release_bus(struct spi_slave *slave)
ops->release_bus(dev);
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
int dm_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct udevice *dev = slave->dev;
struct udevice *bus = dev->parent;
if (bus->uclass->uc_drv->id != UCLASS_SPI)
......@@ -95,6 +93,22 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
return spi_get_ops(bus)->xfer(dev, bitlen, dout, din, flags);
}
int spi_claim_bus(struct spi_slave *slave)
{
return dm_spi_claim_bus(slave->dev);
}
void spi_release_bus(struct spi_slave *slave)
{
dm_spi_release_bus(slave->dev);
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
return dm_spi_xfer(slave->dev, bitlen, dout, din, flags);
}
static int spi_post_bind(struct udevice *dev)
{
/* Scan the bus for devices */
......
......@@ -612,6 +612,58 @@ int sandbox_spi_get_emul(struct sandbox_state *state,
struct udevice *bus, struct udevice *slave,
struct udevice **emulp);
/**
* Claim the bus and prepare it for communication with a given slave.
*
* This must be called before doing any transfers with a SPI slave. It
* will enable and initialize any SPI hardware as necessary, and make
* sure that the SCK line is in the correct idle state. It is not
* allowed to claim the same bus for several slaves without releasing
* the bus in between.
*
* @dev: The SPI slave device
*
* Returns: 0 if the bus was claimed successfully, or a negative value
* if it wasn't.
*/
int dm_spi_claim_bus(struct udevice *dev);
/**
* Release the SPI bus
*
* This must be called once for every call to dm_spi_claim_bus() after
* all transfers have finished. It may disable any SPI hardware as
* appropriate.
*
* @slave: The SPI slave device
*/
void dm_spi_release_bus(struct udevice *dev);
/**
* SPI transfer
*
* This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
* "bitlen" bits in the SPI MISO port. That's just the way SPI works.
*
* The source of the outgoing bits is the "dout" parameter and the
* destination of the input bits is the "din" parameter. Note that "dout"
* and "din" can point to the same memory location, in which case the
* input data overwrites the output data (since both are buffered by
* temporary variables, this is OK).
*
* dm_spi_xfer() interface:
* @dev: The SPI slave device which will be sending/receiving the data.
* @bitlen: How many bits to write and read.
* @dout: Pointer to a string of bits to send out. The bits are
* held in a byte array and are sent MSB first.
* @din: Pointer to a string of bits that will be filled in.
* @flags: A bitwise combination of SPI_XFER_* flags.
*
* Returns: 0 on success, not 0 on failure
*/
int dm_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags);
/* Access the operations for a SPI device */
#define spi_get_ops(dev) ((struct dm_spi_ops *)(dev)->driver->ops)
#define spi_emul_get_ops(dev) ((struct dm_spi_emul_ops *)(dev)->driver->ops)
......
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