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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
<cbostic@linux.vnet.ibm.com> and Edward A. James <eajames@us.ibm.com>.

Signed-off-by: Edward A. James <eajames@us.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeremy Kerr 2017-06-06 16:08:45 -05:00 committed by Greg Kroah-Hartman
parent f7ade2a603
commit 4efe37f4c4
2 changed files with 55 additions and 2 deletions
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50
drivers/fsi/fsi-core.c
View file

@ -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)
{

7
include/linux/fsi.h
View file

@ -27,6 +27,12 @@ struct fsi_device {
uint32_t size;
};
extern int fsi_device_read(struct fsi_device *dev, uint32_t addr,
void *val, size_t size);
extern int fsi_device_write(struct fsi_device *dev, uint32_t addr,
const void *val, size_t size);
extern int fsi_device_peek(struct fsi_device *dev, void *val);
struct fsi_device_id {
u8 engine_type;
u8 version;
@ -40,7 +46,6 @@ struct fsi_device_id {
#define FSI_DEVICE_VERSIONED(t, v) \
.engine_type = (t), .version = (v),
struct fsi_driver {
struct device_driver drv;
const struct fsi_device_id *id_table;