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drivers/fsi: Implement slave initialisation 

Implement fsi_slave_init: if we can read a chip ID, create fsi_slave
devices and register with the driver core.

Includes changes from Christopher Bostic <cbostic@linux.vnet.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>
hifive-unleashed-5.1
Jeremy Kerr 2017-06-06 16:08:42 -05:00 committed by Greg Kroah-Hartman
parent 2609528211
commit 2b545cd8e1
2 changed files with 66 additions and 2 deletions
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1
drivers/fsi/Kconfig
View File

@ -6,6 +6,7 @@ menu "FSI support"
config FSI
tristate "FSI support"
select CRC4
---help---
FSI - the FRU Support Interface - is a simple bus for low-level
access to POWER-based hardware.

67
drivers/fsi/fsi-core.c
View File

@ -13,13 +13,17 @@
* GNU General Public License for more details.
*/
#include <linux/crc4.h>
#include <linux/device.h>
#include <linux/fsi.h>
#include <linux/idr.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "fsi-master.h"
#define FSI_SLAVE_SIZE_23b 0x800000
static DEFINE_IDA(master_ida);
struct fsi_slave {
@ -90,11 +94,70 @@ static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
addr, val, size);
}
static void fsi_slave_release(struct device *dev)
{
struct fsi_slave *slave = to_fsi_slave(dev);
kfree(slave);
}
static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
{
/* todo: initialise slave device, perform engine scan */
struct fsi_slave *slave;
uint32_t chip_id;
uint8_t crc;
int rc;
return -ENODEV;
/* Currently, we only support single slaves on a link, and use the
* full 23-bit address range
*/
if (id != 0)
return -EINVAL;
rc = fsi_master_read(master, link, id, 0, &chip_id, sizeof(chip_id));
if (rc) {
dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n",
link, id, rc);
return -ENODEV;
}
chip_id = be32_to_cpu(chip_id);
crc = crc4(0, chip_id, 32);
if (crc) {
dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n",
link, id);
return -EIO;
}
dev_info(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n",
chip_id, master->idx, link, id);
/* We can communicate with a slave; create the slave device and
* register.
*/
slave = kzalloc(sizeof(*slave), GFP_KERNEL);
if (!slave)
return -ENOMEM;
slave->master = master;
slave->dev.parent = &master->dev;
slave->dev.release = fsi_slave_release;
slave->link = link;
slave->id = id;
slave->size = FSI_SLAVE_SIZE_23b;
dev_set_name(&slave->dev, "slave@%02x:%02x", link, id);
rc = device_register(&slave->dev);
if (rc < 0) {
dev_warn(&master->dev, "failed to create slave device: %d\n",
rc);
put_device(&slave->dev);
return rc;
}
/* todo: perform engine scan */
return rc;
}
/* FSI master support */