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drivers/fsi: Add device read/write/peek API

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This change introduces the fsi device API: simple read, write and peek
accessors for the devices' address spaces.

Includes contributions from Christopher Bostic
<[email protected]> and Edward A. James <[email protected]>.

Signed-off-by: Edward A. James <[email protected]>
Signed-off-by: Jeremy Kerr <[email protected]>
Signed-off-by: Christopher Bostic <[email protected]>
Signed-off-by: Joel Stanley <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Jeremy Kerr 2017-06-06 16:08:45 -05:00 • committed by Greg Kroah-Hartman
commit 4efe37f4c4
2 changed files with 55 additions and 2 deletions
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50
drivers/fsi/fsi-core.c
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@ -34,6 +34,8 @@
#define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0)
#define FSI_SLAVE_CONF_DATA_BITS 28
#define FSI_PEEK_BASE 0x410
static const int engine_page_size = 0x400;
#define FSI_SLAVE_BASE 0x800
@ -75,8 +77,54 @@ static int fsi_master_read(struct fsi_master *master, int link,
uint8_t slave_id, uint32_t addr, void *val, size_t size);
static int fsi_master_write(struct fsi_master *master, int link,
uint8_t slave_id, uint32_t addr, const void *val, size_t size);
static int fsi_slave_read(struct fsi_slave *slave, uint32_t addr,
void *val, size_t size);
static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
const void *val, size_t size);
/* FSI endpoint-device support */
/*
* fsi_device_read() / fsi_device_write() / fsi_device_peek()
*
* FSI endpoint-device support
*
* Read / write / peek accessors for a client
*
* Parameters:
* dev: Structure passed to FSI client device drivers on probe().
* addr: FSI address of given device. Client should pass in its base address
* plus desired offset to access its register space.
* val: For read/peek this is the value read at the specified address. For
* write this is value to write to the specified address.
* The data in val must be FSI bus endian (big endian).
* size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes.
* Addresses must be aligned on size boundaries or an error will result.
*/
int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val,
size_t size)
{
if (addr > dev->size || size > dev->size || addr > dev->size - size)
return -EINVAL;
return fsi_slave_read(dev->slave, dev->addr + addr, val, size);
}
EXPORT_SYMBOL_GPL(fsi_device_read);
int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val,
size_t size)
{
if (addr > dev->size || size > dev->size || addr > dev->size - size)
return -EINVAL;
return fsi_slave_write(dev->slave, dev->addr + addr, val, size);
}
EXPORT_SYMBOL_GPL(fsi_device_write);
int fsi_device_peek(struct fsi_device *dev, void *val)
{
uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t));
return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t));
}
static void fsi_device_release(struct device *_device)
{