drivers/fsi: scan slaves & register devices
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>zero-colors
Jeremy Kerr
Greg Kroah-Hartman
parent
2b37c3e285
commit
f7ade2a603
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@ -19,9 +19,23 @@
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#include <linux/idr.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include "fsi-master.h"
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#define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31)
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#define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16)
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#define FSI_SLAVE_CONF_SLOTS_SHIFT 16
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#define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12)
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#define FSI_SLAVE_CONF_VERSION_SHIFT 12
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#define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4)
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#define FSI_SLAVE_CONF_TYPE_SHIFT 4
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#define FSI_SLAVE_CONF_CRC_SHIFT 4
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#define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0)
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#define FSI_SLAVE_CONF_DATA_BITS 28
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static const int engine_page_size = 0x400;
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#define FSI_SLAVE_BASE 0x800
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/*
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@ -62,6 +76,30 @@ static int fsi_master_read(struct fsi_master *master, int link,
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static int fsi_master_write(struct fsi_master *master, int link,
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uint8_t slave_id, uint32_t addr, const void *val, size_t size);
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/* FSI endpoint-device support */
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static void fsi_device_release(struct device *_device)
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{
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struct fsi_device *device = to_fsi_dev(_device);
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kfree(device);
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}
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static struct fsi_device *fsi_create_device(struct fsi_slave *slave)
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{
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struct fsi_device *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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dev->dev.parent = &slave->dev;
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dev->dev.bus = &fsi_bus_type;
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dev->dev.release = fsi_device_release;
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return dev;
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}
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/* FSI slave support */
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static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp,
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uint8_t *idp)
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@ -115,6 +153,91 @@ static int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
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addr, val, size);
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}
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static int fsi_slave_scan(struct fsi_slave *slave)
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{
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uint32_t engine_addr;
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uint32_t conf;
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int rc, i;
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/*
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* scan engines
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*
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* We keep the peek mode and slave engines for the core; so start
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* at the third slot in the configuration table. We also need to
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* skip the chip ID entry at the start of the address space.
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*/
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engine_addr = engine_page_size * 3;
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for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) {
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uint8_t slots, version, type, crc;
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struct fsi_device *dev;
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rc = fsi_slave_read(slave, (i + 1) * sizeof(conf),
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&conf, sizeof(conf));
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if (rc) {
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dev_warn(&slave->dev,
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"error reading slave registers\n");
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return -1;
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}
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conf = be32_to_cpu(conf);
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crc = crc4(0, conf, 32);
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if (crc) {
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dev_warn(&slave->dev,
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"crc error in slave register at 0x%04x\n",
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i);
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return -1;
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}
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slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK)
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>> FSI_SLAVE_CONF_SLOTS_SHIFT;
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version = (conf & FSI_SLAVE_CONF_VERSION_MASK)
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>> FSI_SLAVE_CONF_VERSION_SHIFT;
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type = (conf & FSI_SLAVE_CONF_TYPE_MASK)
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>> FSI_SLAVE_CONF_TYPE_SHIFT;
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/*
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* Unused address areas are marked by a zero type value; this
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* skips the defined address areas
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*/
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if (type != 0 && slots != 0) {
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/* create device */
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dev = fsi_create_device(slave);
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if (!dev)
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return -ENOMEM;
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dev->slave = slave;
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dev->engine_type = type;
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dev->version = version;
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dev->unit = i;
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dev->addr = engine_addr;
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dev->size = slots * engine_page_size;
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dev_dbg(&slave->dev,
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"engine[%i]: type %x, version %x, addr %x size %x\n",
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dev->unit, dev->engine_type, version,
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dev->addr, dev->size);
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dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x",
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slave->master->idx, slave->link,
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slave->id, i - 2);
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rc = device_register(&dev->dev);
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if (rc) {
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dev_warn(&slave->dev, "add failed: %d\n", rc);
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put_device(&dev->dev);
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}
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}
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engine_addr += slots * engine_page_size;
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if (!(conf & FSI_SLAVE_CONF_NEXT_MASK))
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break;
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}
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return 0;
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}
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/* Encode slave local bus echo delay */
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static inline uint32_t fsi_smode_echodly(int x)
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{
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@ -230,7 +353,10 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
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return rc;
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}
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/* todo: perform engine scan */
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rc = fsi_slave_scan(slave);
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if (rc)
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dev_dbg(&master->dev, "failed during slave scan with: %d\n",
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rc);
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return rc;
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}
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@ -21,6 +21,10 @@ struct fsi_device {
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struct device dev;
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u8 engine_type;
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u8 version;
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u8 unit;
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struct fsi_slave *slave;
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uint32_t addr;
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uint32_t size;
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};
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struct fsi_device_id {
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