diff options
author | Jeremy Kerr <jk@ozlabs.org> | 2017-06-06 23:08:40 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-09 11:52:07 +0200 |
commit | 014c2abc530d7f3674c195891cef7128352453e0 (patch) | |
tree | a0e769955bb33b0aa4f0230e8fdf4307a4117162 /drivers/fsi | |
parent | lib: Add crc4 module (diff) | |
download | linux-014c2abc530d7f3674c195891cef7128352453e0.tar.xz linux-014c2abc530d7f3674c195891cef7128352453e0.zip |
drivers/fsi: Add slave & master read/write APIs
Introduce functions to perform reads/writes on the slave address space;
these simply pass the request on the slave's master with the correct
link and slave ID.
We implement these on top of similar helpers for the master.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fsi')
-rw-r--r-- | drivers/fsi/fsi-core.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index e90d45dec168..1ec97909e520 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -32,7 +32,64 @@ struct fsi_slave { #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) +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); + /* FSI slave support */ +static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, + uint8_t *idp) +{ + uint32_t addr = *addrp; + uint8_t id = *idp; + + if (addr > slave->size) + return -EINVAL; + + /* For 23 bit addressing, we encode the extra two bits in the slave + * id (and the slave's actual ID needs to be 0). + */ + if (addr > 0x1fffff) { + if (slave->id != 0) + return -EINVAL; + id = (addr >> 21) & 0x3; + addr &= 0x1fffff; + } + + *addrp = addr; + *idp = id; + return 0; +} + +static int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, + void *val, size_t size) +{ + uint8_t id = slave->id; + int rc; + + rc = fsi_slave_calc_addr(slave, &addr, &id); + if (rc) + return rc; + + return fsi_master_read(slave->master, slave->link, id, + addr, val, size); +} + +static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, + const void *val, size_t size) +{ + uint8_t id = slave->id; + int rc; + + rc = fsi_slave_calc_addr(slave, &addr, &id); + if (rc) + return rc; + + return fsi_master_write(slave->master, slave->link, id, + addr, val, size); +} + static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) { /* todo: initialise slave device, perform engine scan */ @@ -41,6 +98,41 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) } /* FSI master support */ +static int fsi_check_access(uint32_t addr, size_t size) +{ + if (size != 1 && size != 2 && size != 4) + return -EINVAL; + + if ((addr & 0x3) != (size & 0x3)) + return -EINVAL; + + return 0; +} + +static int fsi_master_read(struct fsi_master *master, int link, + uint8_t slave_id, uint32_t addr, void *val, size_t size) +{ + int rc; + + rc = fsi_check_access(addr, size); + if (rc) + return rc; + + return master->read(master, link, slave_id, addr, val, 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) +{ + int rc; + + rc = fsi_check_access(addr, size); + if (rc) + return rc; + + return master->write(master, link, slave_id, addr, val, size); +} + static int fsi_master_scan(struct fsi_master *master) { int link; |