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drivers/fsi: scan slaves & register devices

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Now that we have fsi_slave devices, scan each for endpoints, and
register them on the fsi bus.

Includes contributions 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>
This commit is contained in:
Jeremy Kerr 2017-06-06 16:08:44 -05:00 committed by Greg Kroah-Hartman
parent 2b37c3e285
commit f7ade2a603
2 changed files with 131 additions and 1 deletions
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128
drivers/fsi/fsi-core.c
View File

@ -19,9 +19,23 @@
#include <linux/idr.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include "fsi-master.h"
#define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31)
#define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16)
#define FSI_SLAVE_CONF_SLOTS_SHIFT 16
#define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12)
#define FSI_SLAVE_CONF_VERSION_SHIFT 12
#define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4)
#define FSI_SLAVE_CONF_TYPE_SHIFT 4
#define FSI_SLAVE_CONF_CRC_SHIFT 4
#define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0)
#define FSI_SLAVE_CONF_DATA_BITS 28
static const int engine_page_size = 0x400;
#define FSI_SLAVE_BASE 0x800
/*
@ -62,6 +76,30 @@ static int fsi_master_read(struct fsi_master *master, int link,
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 endpoint-device support */
static void fsi_device_release(struct device *_device)
{
struct fsi_device *device = to_fsi_dev(_device);
kfree(device);
}
static struct fsi_device *fsi_create_device(struct fsi_slave *slave)
{
struct fsi_device *dev;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return NULL;
dev->dev.parent = &slave->dev;
dev->dev.bus = &fsi_bus_type;
dev->dev.release = fsi_device_release;
return dev;
}
/* FSI slave support */
static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp,
uint8_t *idp)
@ -115,6 +153,91 @@ static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
addr, val, size);
}
static int fsi_slave_scan(struct fsi_slave *slave)
{
uint32_t engine_addr;
uint32_t conf;
int rc, i;
/*
* scan engines
*
* We keep the peek mode and slave engines for the core; so start
* at the third slot in the configuration table. We also need to
* skip the chip ID entry at the start of the address space.
*/
engine_addr = engine_page_size * 3;
for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) {
uint8_t slots, version, type, crc;
struct fsi_device *dev;
rc = fsi_slave_read(slave, (i + 1) * sizeof(conf),
&conf, sizeof(conf));
if (rc) {
dev_warn(&slave->dev,
"error reading slave registers\n");
return -1;
}
conf = be32_to_cpu(conf);
crc = crc4(0, conf, 32);
if (crc) {
dev_warn(&slave->dev,
"crc error in slave register at 0x%04x\n",
i);
return -1;
}
slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK)
>> FSI_SLAVE_CONF_SLOTS_SHIFT;
version = (conf & FSI_SLAVE_CONF_VERSION_MASK)
>> FSI_SLAVE_CONF_VERSION_SHIFT;
type = (conf & FSI_SLAVE_CONF_TYPE_MASK)
>> FSI_SLAVE_CONF_TYPE_SHIFT;
/*
* Unused address areas are marked by a zero type value; this
* skips the defined address areas
*/
if (type != 0 && slots != 0) {
/* create device */
dev = fsi_create_device(slave);
if (!dev)
return -ENOMEM;
dev->slave = slave;
dev->engine_type = type;
dev->version = version;
dev->unit = i;
dev->addr = engine_addr;
dev->size = slots * engine_page_size;
dev_dbg(&slave->dev,
"engine[%i]: type %x, version %x, addr %x size %x\n",
dev->unit, dev->engine_type, version,
dev->addr, dev->size);
dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x",
slave->master->idx, slave->link,
slave->id, i - 2);
rc = device_register(&dev->dev);
if (rc) {
dev_warn(&slave->dev, "add failed: %d\n", rc);
put_device(&dev->dev);
}
}
engine_addr += slots * engine_page_size;
if (!(conf & FSI_SLAVE_CONF_NEXT_MASK))
break;
}
return 0;
}
/* Encode slave local bus echo delay */
static inline uint32_t fsi_smode_echodly(int x)
{
@ -230,7 +353,10 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
return rc;
}
/* todo: perform engine scan */
rc = fsi_slave_scan(slave);
if (rc)
dev_dbg(&master->dev, "failed during slave scan with: %d\n",
rc);
return rc;
}

4
include/linux/fsi.h
View File

@ -21,6 +21,10 @@ struct fsi_device {
struct device dev;
u8 engine_type;
u8 version;
u8 unit;
struct fsi_slave *slave;
uint32_t addr;
uint32_t size;
};
struct fsi_device_id {