10508ad1fSJeremy Kerr /* 20508ad1fSJeremy Kerr * FSI core driver 30508ad1fSJeremy Kerr * 40508ad1fSJeremy Kerr * Copyright (C) IBM Corporation 2016 50508ad1fSJeremy Kerr * 60508ad1fSJeremy Kerr * This program is free software; you can redistribute it and/or modify 70508ad1fSJeremy Kerr * it under the terms of the GNU General Public License version 2 as 80508ad1fSJeremy Kerr * published by the Free Software Foundation. 90508ad1fSJeremy Kerr * 100508ad1fSJeremy Kerr * This program is distributed in the hope that it will be useful, 110508ad1fSJeremy Kerr * but WITHOUT ANY WARRANTY; without even the implied warranty of 120508ad1fSJeremy Kerr * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 130508ad1fSJeremy Kerr * GNU General Public License for more details. 140508ad1fSJeremy Kerr */ 150508ad1fSJeremy Kerr 162b545cd8SJeremy Kerr #include <linux/crc4.h> 170508ad1fSJeremy Kerr #include <linux/device.h> 180508ad1fSJeremy Kerr #include <linux/fsi.h> 1909aecfabSJeremy Kerr #include <linux/idr.h> 200508ad1fSJeremy Kerr #include <linux/module.h> 212b545cd8SJeremy Kerr #include <linux/slab.h> 22f7ade2a6SJeremy Kerr #include <linux/bitops.h> 230508ad1fSJeremy Kerr 2409aecfabSJeremy Kerr #include "fsi-master.h" 2509aecfabSJeremy Kerr 2666433b05SJeremy Kerr #define CREATE_TRACE_POINTS 2766433b05SJeremy Kerr #include <trace/events/fsi.h> 2866433b05SJeremy Kerr 29f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) 30f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) 31f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 32f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) 33f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_SHIFT 12 34f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) 35f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_SHIFT 4 36f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_SHIFT 4 37f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) 38f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_DATA_BITS 28 39f7ade2a6SJeremy Kerr 404efe37f4SJeremy Kerr #define FSI_PEEK_BASE 0x410 414efe37f4SJeremy Kerr 42f7ade2a6SJeremy Kerr static const int engine_page_size = 0x400; 43f7ade2a6SJeremy Kerr 442b37c3e2SChristopher Bostic #define FSI_SLAVE_BASE 0x800 452b37c3e2SChristopher Bostic 462b37c3e2SChristopher Bostic /* 472b37c3e2SChristopher Bostic * FSI slave engine control register offsets 482b37c3e2SChristopher Bostic */ 492b37c3e2SChristopher Bostic #define FSI_SMODE 0x0 /* R/W: Mode register */ 502b37c3e2SChristopher Bostic 512b37c3e2SChristopher Bostic /* 522b37c3e2SChristopher Bostic * SMODE fields 532b37c3e2SChristopher Bostic */ 542b37c3e2SChristopher Bostic #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ 552b37c3e2SChristopher Bostic #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ 562b37c3e2SChristopher Bostic #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ 572b37c3e2SChristopher Bostic #define FSI_SMODE_SID_MASK 3 /* ID Mask */ 582b37c3e2SChristopher Bostic #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ 592b37c3e2SChristopher Bostic #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ 602b37c3e2SChristopher Bostic #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ 612b37c3e2SChristopher Bostic #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ 622b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ 632b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ 642b37c3e2SChristopher Bostic 652b545cd8SJeremy Kerr #define FSI_SLAVE_SIZE_23b 0x800000 662b545cd8SJeremy Kerr 6709aecfabSJeremy Kerr static DEFINE_IDA(master_ida); 6809aecfabSJeremy Kerr 69faf0b116SJeremy Kerr struct fsi_slave { 70faf0b116SJeremy Kerr struct device dev; 71faf0b116SJeremy Kerr struct fsi_master *master; 72faf0b116SJeremy Kerr int id; 73faf0b116SJeremy Kerr int link; 74faf0b116SJeremy Kerr uint32_t size; /* size of slave address space */ 75faf0b116SJeremy Kerr }; 76faf0b116SJeremy Kerr 77cd0fdb5cSChristopher Bostic #define to_fsi_master(d) container_of(d, struct fsi_master, dev) 78faf0b116SJeremy Kerr #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) 79faf0b116SJeremy Kerr 80014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 81014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 82014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 83014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 84014c2abcSJeremy Kerr 854efe37f4SJeremy Kerr /* 864efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 874efe37f4SJeremy Kerr * 884efe37f4SJeremy Kerr * FSI endpoint-device support 894efe37f4SJeremy Kerr * 904efe37f4SJeremy Kerr * Read / write / peek accessors for a client 914efe37f4SJeremy Kerr * 924efe37f4SJeremy Kerr * Parameters: 934efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 944efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 954efe37f4SJeremy Kerr * plus desired offset to access its register space. 964efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 974efe37f4SJeremy Kerr * write this is value to write to the specified address. 984efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 994efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1004efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1014efe37f4SJeremy Kerr */ 1024efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1034efe37f4SJeremy Kerr size_t size) 1044efe37f4SJeremy Kerr { 1054efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1064efe37f4SJeremy Kerr return -EINVAL; 1074efe37f4SJeremy Kerr 1084efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1094efe37f4SJeremy Kerr } 1104efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1114efe37f4SJeremy Kerr 1124efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1134efe37f4SJeremy Kerr size_t size) 1144efe37f4SJeremy Kerr { 1154efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1164efe37f4SJeremy Kerr return -EINVAL; 1174efe37f4SJeremy Kerr 1184efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1194efe37f4SJeremy Kerr } 1204efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1214efe37f4SJeremy Kerr 1224efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1234efe37f4SJeremy Kerr { 1244efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1254efe37f4SJeremy Kerr 1264efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1274efe37f4SJeremy Kerr } 128f7ade2a6SJeremy Kerr 129f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 130f7ade2a6SJeremy Kerr { 131f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 132f7ade2a6SJeremy Kerr 133f7ade2a6SJeremy Kerr kfree(device); 134f7ade2a6SJeremy Kerr } 135f7ade2a6SJeremy Kerr 136f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 137f7ade2a6SJeremy Kerr { 138f7ade2a6SJeremy Kerr struct fsi_device *dev; 139f7ade2a6SJeremy Kerr 140f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 141f7ade2a6SJeremy Kerr if (!dev) 142f7ade2a6SJeremy Kerr return NULL; 143f7ade2a6SJeremy Kerr 144f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 145f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 146f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 147f7ade2a6SJeremy Kerr 148f7ade2a6SJeremy Kerr return dev; 149f7ade2a6SJeremy Kerr } 150f7ade2a6SJeremy Kerr 151414c1026SJeremy Kerr /* FSI slave support */ 152014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 153014c2abcSJeremy Kerr uint8_t *idp) 154014c2abcSJeremy Kerr { 155014c2abcSJeremy Kerr uint32_t addr = *addrp; 156014c2abcSJeremy Kerr uint8_t id = *idp; 157014c2abcSJeremy Kerr 158014c2abcSJeremy Kerr if (addr > slave->size) 159014c2abcSJeremy Kerr return -EINVAL; 160014c2abcSJeremy Kerr 161014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 162014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 163014c2abcSJeremy Kerr */ 164014c2abcSJeremy Kerr if (addr > 0x1fffff) { 165014c2abcSJeremy Kerr if (slave->id != 0) 166014c2abcSJeremy Kerr return -EINVAL; 167014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 168014c2abcSJeremy Kerr addr &= 0x1fffff; 169014c2abcSJeremy Kerr } 170014c2abcSJeremy Kerr 171014c2abcSJeremy Kerr *addrp = addr; 172014c2abcSJeremy Kerr *idp = id; 173014c2abcSJeremy Kerr return 0; 174014c2abcSJeremy Kerr } 175014c2abcSJeremy Kerr 176da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 177014c2abcSJeremy Kerr void *val, size_t size) 178014c2abcSJeremy Kerr { 179014c2abcSJeremy Kerr uint8_t id = slave->id; 180014c2abcSJeremy Kerr int rc; 181014c2abcSJeremy Kerr 182014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 183014c2abcSJeremy Kerr if (rc) 184014c2abcSJeremy Kerr return rc; 185014c2abcSJeremy Kerr 186014c2abcSJeremy Kerr return fsi_master_read(slave->master, slave->link, id, 187014c2abcSJeremy Kerr addr, val, size); 188014c2abcSJeremy Kerr } 189da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 190014c2abcSJeremy Kerr 191da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 192014c2abcSJeremy Kerr const void *val, size_t size) 193014c2abcSJeremy Kerr { 194014c2abcSJeremy Kerr uint8_t id = slave->id; 195014c2abcSJeremy Kerr int rc; 196014c2abcSJeremy Kerr 197014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 198014c2abcSJeremy Kerr if (rc) 199014c2abcSJeremy Kerr return rc; 200014c2abcSJeremy Kerr 201014c2abcSJeremy Kerr return fsi_master_write(slave->master, slave->link, id, 202014c2abcSJeremy Kerr addr, val, size); 203014c2abcSJeremy Kerr } 204da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 205da36cadfSJeremy Kerr 206da36cadfSJeremy Kerr extern int fsi_slave_claim_range(struct fsi_slave *slave, 207da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 208da36cadfSJeremy Kerr { 209da36cadfSJeremy Kerr if (addr + size < addr) 210da36cadfSJeremy Kerr return -EINVAL; 211da36cadfSJeremy Kerr 212da36cadfSJeremy Kerr if (addr + size > slave->size) 213da36cadfSJeremy Kerr return -EINVAL; 214da36cadfSJeremy Kerr 215da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 216da36cadfSJeremy Kerr return 0; 217da36cadfSJeremy Kerr } 218da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 219da36cadfSJeremy Kerr 220da36cadfSJeremy Kerr extern void fsi_slave_release_range(struct fsi_slave *slave, 221da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 222da36cadfSJeremy Kerr { 223da36cadfSJeremy Kerr } 224da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 225014c2abcSJeremy Kerr 226f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 227f7ade2a6SJeremy Kerr { 228f7ade2a6SJeremy Kerr uint32_t engine_addr; 229f7ade2a6SJeremy Kerr uint32_t conf; 230f7ade2a6SJeremy Kerr int rc, i; 231f7ade2a6SJeremy Kerr 232f7ade2a6SJeremy Kerr /* 233f7ade2a6SJeremy Kerr * scan engines 234f7ade2a6SJeremy Kerr * 235f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 236f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 237f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 238f7ade2a6SJeremy Kerr */ 239f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 240f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 241f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 242f7ade2a6SJeremy Kerr struct fsi_device *dev; 243f7ade2a6SJeremy Kerr 244f7ade2a6SJeremy Kerr rc = fsi_slave_read(slave, (i + 1) * sizeof(conf), 245f7ade2a6SJeremy Kerr &conf, sizeof(conf)); 246f7ade2a6SJeremy Kerr if (rc) { 247f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 248f7ade2a6SJeremy Kerr "error reading slave registers\n"); 249f7ade2a6SJeremy Kerr return -1; 250f7ade2a6SJeremy Kerr } 251f7ade2a6SJeremy Kerr conf = be32_to_cpu(conf); 252f7ade2a6SJeremy Kerr 253f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 254f7ade2a6SJeremy Kerr if (crc) { 255f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 256f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 257f7ade2a6SJeremy Kerr i); 258f7ade2a6SJeremy Kerr return -1; 259f7ade2a6SJeremy Kerr } 260f7ade2a6SJeremy Kerr 261f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 262f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 263f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 264f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 265f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 266f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 267f7ade2a6SJeremy Kerr 268f7ade2a6SJeremy Kerr /* 269f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 270f7ade2a6SJeremy Kerr * skips the defined address areas 271f7ade2a6SJeremy Kerr */ 272f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 273f7ade2a6SJeremy Kerr 274f7ade2a6SJeremy Kerr /* create device */ 275f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 276f7ade2a6SJeremy Kerr if (!dev) 277f7ade2a6SJeremy Kerr return -ENOMEM; 278f7ade2a6SJeremy Kerr 279f7ade2a6SJeremy Kerr dev->slave = slave; 280f7ade2a6SJeremy Kerr dev->engine_type = type; 281f7ade2a6SJeremy Kerr dev->version = version; 282f7ade2a6SJeremy Kerr dev->unit = i; 283f7ade2a6SJeremy Kerr dev->addr = engine_addr; 284f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 285f7ade2a6SJeremy Kerr 286f7ade2a6SJeremy Kerr dev_dbg(&slave->dev, 287f7ade2a6SJeremy Kerr "engine[%i]: type %x, version %x, addr %x size %x\n", 288f7ade2a6SJeremy Kerr dev->unit, dev->engine_type, version, 289f7ade2a6SJeremy Kerr dev->addr, dev->size); 290f7ade2a6SJeremy Kerr 291f7ade2a6SJeremy Kerr dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", 292f7ade2a6SJeremy Kerr slave->master->idx, slave->link, 293f7ade2a6SJeremy Kerr slave->id, i - 2); 294f7ade2a6SJeremy Kerr 295f7ade2a6SJeremy Kerr rc = device_register(&dev->dev); 296f7ade2a6SJeremy Kerr if (rc) { 297f7ade2a6SJeremy Kerr dev_warn(&slave->dev, "add failed: %d\n", rc); 298f7ade2a6SJeremy Kerr put_device(&dev->dev); 299f7ade2a6SJeremy Kerr } 300f7ade2a6SJeremy Kerr } 301f7ade2a6SJeremy Kerr 302f7ade2a6SJeremy Kerr engine_addr += slots * engine_page_size; 303f7ade2a6SJeremy Kerr 304f7ade2a6SJeremy Kerr if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) 305f7ade2a6SJeremy Kerr break; 306f7ade2a6SJeremy Kerr } 307f7ade2a6SJeremy Kerr 308f7ade2a6SJeremy Kerr return 0; 309f7ade2a6SJeremy Kerr } 310f7ade2a6SJeremy Kerr 311125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 312125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 313125739cbSJeremy Kerr loff_t off, size_t count) 314125739cbSJeremy Kerr { 315125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 316125739cbSJeremy Kerr size_t total_len, read_len; 317125739cbSJeremy Kerr int rc; 318125739cbSJeremy Kerr 319125739cbSJeremy Kerr if (off < 0) 320125739cbSJeremy Kerr return -EINVAL; 321125739cbSJeremy Kerr 322125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 323125739cbSJeremy Kerr return -EINVAL; 324125739cbSJeremy Kerr 325125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += read_len) { 326125739cbSJeremy Kerr read_len = min_t(size_t, count, 4); 327125739cbSJeremy Kerr read_len -= off & 0x3; 328125739cbSJeremy Kerr 329125739cbSJeremy Kerr rc = fsi_slave_read(slave, off, buf + total_len, read_len); 330125739cbSJeremy Kerr if (rc) 331125739cbSJeremy Kerr return rc; 332125739cbSJeremy Kerr 333125739cbSJeremy Kerr off += read_len; 334125739cbSJeremy Kerr } 335125739cbSJeremy Kerr 336125739cbSJeremy Kerr return count; 337125739cbSJeremy Kerr } 338125739cbSJeremy Kerr 339125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_write(struct file *file, 340125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 341125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 342125739cbSJeremy Kerr { 343125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 344125739cbSJeremy Kerr size_t total_len, write_len; 345125739cbSJeremy Kerr int rc; 346125739cbSJeremy Kerr 347125739cbSJeremy Kerr if (off < 0) 348125739cbSJeremy Kerr return -EINVAL; 349125739cbSJeremy Kerr 350125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 351125739cbSJeremy Kerr return -EINVAL; 352125739cbSJeremy Kerr 353125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += write_len) { 354125739cbSJeremy Kerr write_len = min_t(size_t, count, 4); 355125739cbSJeremy Kerr write_len -= off & 0x3; 356125739cbSJeremy Kerr 357125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 358125739cbSJeremy Kerr if (rc) 359125739cbSJeremy Kerr return rc; 360125739cbSJeremy Kerr 361125739cbSJeremy Kerr off += write_len; 362125739cbSJeremy Kerr } 363125739cbSJeremy Kerr 364125739cbSJeremy Kerr return count; 365125739cbSJeremy Kerr } 366125739cbSJeremy Kerr 367125739cbSJeremy Kerr static struct bin_attribute fsi_slave_raw_attr = { 368125739cbSJeremy Kerr .attr = { 369125739cbSJeremy Kerr .name = "raw", 370125739cbSJeremy Kerr .mode = 0600, 371125739cbSJeremy Kerr }, 372125739cbSJeremy Kerr .size = 0, 373125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 374125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 375125739cbSJeremy Kerr }; 376125739cbSJeremy Kerr 377125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_term_write(struct file *file, 378125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 379125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 380125739cbSJeremy Kerr { 381125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 382125739cbSJeremy Kerr struct fsi_master *master = slave->master; 383125739cbSJeremy Kerr 384125739cbSJeremy Kerr if (!master->term) 385125739cbSJeremy Kerr return -ENODEV; 386125739cbSJeremy Kerr 387125739cbSJeremy Kerr master->term(master, slave->link, slave->id); 388125739cbSJeremy Kerr return count; 389125739cbSJeremy Kerr } 390125739cbSJeremy Kerr 391125739cbSJeremy Kerr static struct bin_attribute fsi_slave_term_attr = { 392125739cbSJeremy Kerr .attr = { 393125739cbSJeremy Kerr .name = "term", 394125739cbSJeremy Kerr .mode = 0200, 395125739cbSJeremy Kerr }, 396125739cbSJeremy Kerr .size = 0, 397125739cbSJeremy Kerr .write = fsi_slave_sysfs_term_write, 398125739cbSJeremy Kerr }; 399125739cbSJeremy Kerr 4002b37c3e2SChristopher Bostic /* Encode slave local bus echo delay */ 4012b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_echodly(int x) 4022b37c3e2SChristopher Bostic { 4032b37c3e2SChristopher Bostic return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 4042b37c3e2SChristopher Bostic } 4052b37c3e2SChristopher Bostic 4062b37c3e2SChristopher Bostic /* Encode slave local bus send delay */ 4072b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_senddly(int x) 4082b37c3e2SChristopher Bostic { 4092b37c3e2SChristopher Bostic return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 4102b37c3e2SChristopher Bostic } 4112b37c3e2SChristopher Bostic 4122b37c3e2SChristopher Bostic /* Encode slave local bus clock rate ratio */ 4132b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_lbcrr(int x) 4142b37c3e2SChristopher Bostic { 4152b37c3e2SChristopher Bostic return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 4162b37c3e2SChristopher Bostic } 4172b37c3e2SChristopher Bostic 4182b37c3e2SChristopher Bostic /* Encode slave ID */ 4192b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_sid(int x) 4202b37c3e2SChristopher Bostic { 4212b37c3e2SChristopher Bostic return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 4222b37c3e2SChristopher Bostic } 4232b37c3e2SChristopher Bostic 4242b37c3e2SChristopher Bostic static const uint32_t fsi_slave_smode(int id) 4252b37c3e2SChristopher Bostic { 4262b37c3e2SChristopher Bostic return FSI_SMODE_WSC | FSI_SMODE_ECRC 4272b37c3e2SChristopher Bostic | fsi_smode_sid(id) 4282b37c3e2SChristopher Bostic | fsi_smode_echodly(0xf) | fsi_smode_senddly(0xf) 4292b37c3e2SChristopher Bostic | fsi_smode_lbcrr(0x8); 4302b37c3e2SChristopher Bostic } 4312b37c3e2SChristopher Bostic 4322b37c3e2SChristopher Bostic static int fsi_slave_set_smode(struct fsi_master *master, int link, int id) 4332b37c3e2SChristopher Bostic { 4342b37c3e2SChristopher Bostic uint32_t smode; 4352b37c3e2SChristopher Bostic 4362b37c3e2SChristopher Bostic /* set our smode register with the slave ID field to 0; this enables 4372b37c3e2SChristopher Bostic * extended slave addressing 4382b37c3e2SChristopher Bostic */ 4392b37c3e2SChristopher Bostic smode = fsi_slave_smode(id); 4402b37c3e2SChristopher Bostic smode = cpu_to_be32(smode); 4412b37c3e2SChristopher Bostic 4422b37c3e2SChristopher Bostic return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SMODE, 4432b37c3e2SChristopher Bostic &smode, sizeof(smode)); 4442b37c3e2SChristopher Bostic } 4452b37c3e2SChristopher Bostic 4462b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 4472b545cd8SJeremy Kerr { 4482b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 4492b545cd8SJeremy Kerr 4502b545cd8SJeremy Kerr kfree(slave); 4512b545cd8SJeremy Kerr } 4522b545cd8SJeremy Kerr 453414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 454414c1026SJeremy Kerr { 4552b545cd8SJeremy Kerr struct fsi_slave *slave; 4562b545cd8SJeremy Kerr uint32_t chip_id; 4572b545cd8SJeremy Kerr uint8_t crc; 4582b545cd8SJeremy Kerr int rc; 459414c1026SJeremy Kerr 4602b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 4612b545cd8SJeremy Kerr * full 23-bit address range 4622b545cd8SJeremy Kerr */ 4632b545cd8SJeremy Kerr if (id != 0) 4642b545cd8SJeremy Kerr return -EINVAL; 4652b545cd8SJeremy Kerr 4662b545cd8SJeremy Kerr rc = fsi_master_read(master, link, id, 0, &chip_id, sizeof(chip_id)); 4672b545cd8SJeremy Kerr if (rc) { 4682b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 4692b545cd8SJeremy Kerr link, id, rc); 470414c1026SJeremy Kerr return -ENODEV; 471414c1026SJeremy Kerr } 4722b545cd8SJeremy Kerr chip_id = be32_to_cpu(chip_id); 4732b545cd8SJeremy Kerr 4742b545cd8SJeremy Kerr crc = crc4(0, chip_id, 32); 4752b545cd8SJeremy Kerr if (crc) { 4762b545cd8SJeremy Kerr dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n", 4772b545cd8SJeremy Kerr link, id); 4782b545cd8SJeremy Kerr return -EIO; 4792b545cd8SJeremy Kerr } 4802b545cd8SJeremy Kerr 4812b545cd8SJeremy Kerr dev_info(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 4822b545cd8SJeremy Kerr chip_id, master->idx, link, id); 4832b545cd8SJeremy Kerr 4842b37c3e2SChristopher Bostic rc = fsi_slave_set_smode(master, link, id); 4852b37c3e2SChristopher Bostic if (rc) { 4862b37c3e2SChristopher Bostic dev_warn(&master->dev, 4872b37c3e2SChristopher Bostic "can't set smode on slave:%02x:%02x %d\n", 4882b37c3e2SChristopher Bostic link, id, rc); 4892b37c3e2SChristopher Bostic return -ENODEV; 4902b37c3e2SChristopher Bostic } 4912b37c3e2SChristopher Bostic 4922b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 4932b545cd8SJeremy Kerr * register. 4942b545cd8SJeremy Kerr */ 4952b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 4962b545cd8SJeremy Kerr if (!slave) 4972b545cd8SJeremy Kerr return -ENOMEM; 4982b545cd8SJeremy Kerr 4992b545cd8SJeremy Kerr slave->master = master; 5002b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 5012b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 5022b545cd8SJeremy Kerr slave->link = link; 5032b545cd8SJeremy Kerr slave->id = id; 5042b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 5052b545cd8SJeremy Kerr 5062b545cd8SJeremy Kerr dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 5072b545cd8SJeremy Kerr rc = device_register(&slave->dev); 5082b545cd8SJeremy Kerr if (rc < 0) { 5092b545cd8SJeremy Kerr dev_warn(&master->dev, "failed to create slave device: %d\n", 5102b545cd8SJeremy Kerr rc); 5112b545cd8SJeremy Kerr put_device(&slave->dev); 5122b545cd8SJeremy Kerr return rc; 5132b545cd8SJeremy Kerr } 5142b545cd8SJeremy Kerr 515125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 516125739cbSJeremy Kerr if (rc) 517125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 518125739cbSJeremy Kerr 519125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_term_attr); 520125739cbSJeremy Kerr if (rc) 521125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create term attr: %d\n", rc); 522125739cbSJeremy Kerr 523f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 524f7ade2a6SJeremy Kerr if (rc) 525f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 526f7ade2a6SJeremy Kerr rc); 5272b545cd8SJeremy Kerr 5282b545cd8SJeremy Kerr return rc; 5292b545cd8SJeremy Kerr } 530414c1026SJeremy Kerr 53109aecfabSJeremy Kerr /* FSI master support */ 532014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 533014c2abcSJeremy Kerr { 534014c2abcSJeremy Kerr if (size != 1 && size != 2 && size != 4) 535014c2abcSJeremy Kerr return -EINVAL; 536014c2abcSJeremy Kerr 537014c2abcSJeremy Kerr if ((addr & 0x3) != (size & 0x3)) 538014c2abcSJeremy Kerr return -EINVAL; 539014c2abcSJeremy Kerr 540014c2abcSJeremy Kerr return 0; 541014c2abcSJeremy Kerr } 542014c2abcSJeremy Kerr 543014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 544014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 545014c2abcSJeremy Kerr { 546014c2abcSJeremy Kerr int rc; 547014c2abcSJeremy Kerr 54866433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 549014c2abcSJeremy Kerr 55066433b05SJeremy Kerr rc = fsi_check_access(addr, size); 55166433b05SJeremy Kerr if (!rc) 55266433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 55366433b05SJeremy Kerr 55466433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 55566433b05SJeremy Kerr false, val, rc); 55666433b05SJeremy Kerr 55766433b05SJeremy Kerr return rc; 558014c2abcSJeremy Kerr } 559014c2abcSJeremy Kerr 560014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 561014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 562014c2abcSJeremy Kerr { 563014c2abcSJeremy Kerr int rc; 564014c2abcSJeremy Kerr 56566433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 566014c2abcSJeremy Kerr 56766433b05SJeremy Kerr rc = fsi_check_access(addr, size); 56866433b05SJeremy Kerr if (!rc) 56966433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 57066433b05SJeremy Kerr 57166433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 57266433b05SJeremy Kerr true, val, rc); 57366433b05SJeremy Kerr 57466433b05SJeremy Kerr return rc; 575014c2abcSJeremy Kerr } 576014c2abcSJeremy Kerr 57726095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 57826095282SChristopher Bostic { 57926095282SChristopher Bostic if (master->link_enable) 58026095282SChristopher Bostic return master->link_enable(master, link); 58126095282SChristopher Bostic 58226095282SChristopher Bostic return 0; 58326095282SChristopher Bostic } 58426095282SChristopher Bostic 58526095282SChristopher Bostic /* 58626095282SChristopher Bostic * Issue a break command on this link 58726095282SChristopher Bostic */ 58826095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 58926095282SChristopher Bostic { 59066433b05SJeremy Kerr trace_fsi_master_break(master, link); 59166433b05SJeremy Kerr 59226095282SChristopher Bostic if (master->send_break) 59326095282SChristopher Bostic return master->send_break(master, link); 59426095282SChristopher Bostic 59526095282SChristopher Bostic return 0; 59626095282SChristopher Bostic } 59726095282SChristopher Bostic 598414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 599414c1026SJeremy Kerr { 60026095282SChristopher Bostic int link, rc; 601414c1026SJeremy Kerr 60226095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 60326095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 60426095282SChristopher Bostic if (rc) { 60526095282SChristopher Bostic dev_dbg(&master->dev, 60626095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 60726095282SChristopher Bostic continue; 60826095282SChristopher Bostic } 60926095282SChristopher Bostic rc = fsi_master_break(master, link); 61026095282SChristopher Bostic if (rc) { 61126095282SChristopher Bostic dev_dbg(&master->dev, 61226095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 61326095282SChristopher Bostic continue; 61426095282SChristopher Bostic } 61526095282SChristopher Bostic 616414c1026SJeremy Kerr fsi_slave_init(master, link, 0); 61726095282SChristopher Bostic } 618414c1026SJeremy Kerr 619414c1026SJeremy Kerr return 0; 620414c1026SJeremy Kerr } 621414c1026SJeremy Kerr 622cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 623cd0fdb5cSChristopher Bostic { 624cd0fdb5cSChristopher Bostic device_unregister(dev); 625cd0fdb5cSChristopher Bostic return 0; 626cd0fdb5cSChristopher Bostic } 627cd0fdb5cSChristopher Bostic 628cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 629cd0fdb5cSChristopher Bostic { 630cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 631cd0fdb5cSChristopher Bostic device_unregister(dev); 632cd0fdb5cSChristopher Bostic return 0; 633cd0fdb5cSChristopher Bostic } 634cd0fdb5cSChristopher Bostic 635cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 636cd0fdb5cSChristopher Bostic { 637cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 638cd0fdb5cSChristopher Bostic } 639cd0fdb5cSChristopher Bostic 640cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 641cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 642cd0fdb5cSChristopher Bostic { 643cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 644cd0fdb5cSChristopher Bostic int rc; 645cd0fdb5cSChristopher Bostic 646cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 647cd0fdb5cSChristopher Bostic rc = fsi_master_scan(master); 648cd0fdb5cSChristopher Bostic if (rc < 0) 649cd0fdb5cSChristopher Bostic return rc; 650cd0fdb5cSChristopher Bostic 651cd0fdb5cSChristopher Bostic return count; 652cd0fdb5cSChristopher Bostic } 653cd0fdb5cSChristopher Bostic 654cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 655cd0fdb5cSChristopher Bostic 656125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 657125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 658125739cbSJeremy Kerr { 659125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 660125739cbSJeremy Kerr 661125739cbSJeremy Kerr fsi_master_break(master, 0); 662125739cbSJeremy Kerr 663125739cbSJeremy Kerr return count; 664125739cbSJeremy Kerr } 665125739cbSJeremy Kerr 666125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 667125739cbSJeremy Kerr 66809aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 66909aecfabSJeremy Kerr { 67009aecfabSJeremy Kerr int rc; 67109aecfabSJeremy Kerr 67209aecfabSJeremy Kerr if (!master) 67309aecfabSJeremy Kerr return -EINVAL; 67409aecfabSJeremy Kerr 67509aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 67609aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 67709aecfabSJeremy Kerr 67809aecfabSJeremy Kerr rc = device_register(&master->dev); 679414c1026SJeremy Kerr if (rc) { 68009aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 68109aecfabSJeremy Kerr return rc; 68209aecfabSJeremy Kerr } 683414c1026SJeremy Kerr 684cd0fdb5cSChristopher Bostic rc = device_create_file(&master->dev, &dev_attr_rescan); 685cd0fdb5cSChristopher Bostic if (rc) { 686cd0fdb5cSChristopher Bostic device_unregister(&master->dev); 687cd0fdb5cSChristopher Bostic ida_simple_remove(&master_ida, master->idx); 688cd0fdb5cSChristopher Bostic return rc; 689cd0fdb5cSChristopher Bostic } 690cd0fdb5cSChristopher Bostic 691125739cbSJeremy Kerr rc = device_create_file(&master->dev, &dev_attr_break); 692125739cbSJeremy Kerr if (rc) { 693125739cbSJeremy Kerr device_unregister(&master->dev); 694125739cbSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 695125739cbSJeremy Kerr return rc; 696125739cbSJeremy Kerr } 697125739cbSJeremy Kerr 698414c1026SJeremy Kerr fsi_master_scan(master); 699cd0fdb5cSChristopher Bostic 700414c1026SJeremy Kerr return 0; 701414c1026SJeremy Kerr } 70209aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 70309aecfabSJeremy Kerr 70409aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 70509aecfabSJeremy Kerr { 70609aecfabSJeremy Kerr if (master->idx >= 0) { 70709aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 70809aecfabSJeremy Kerr master->idx = -1; 70909aecfabSJeremy Kerr } 71009aecfabSJeremy Kerr 711cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 71209aecfabSJeremy Kerr device_unregister(&master->dev); 71309aecfabSJeremy Kerr } 71409aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 71509aecfabSJeremy Kerr 7160508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 7170508ad1fSJeremy Kerr 718dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 719dd37eed7SJeremy Kerr { 720dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 721dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 722dd37eed7SJeremy Kerr const struct fsi_device_id *id; 723dd37eed7SJeremy Kerr 724dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 725dd37eed7SJeremy Kerr return 0; 726dd37eed7SJeremy Kerr 727dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 728dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 729dd37eed7SJeremy Kerr continue; 730dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 731dd37eed7SJeremy Kerr id->version == fsi_dev->version) 732dd37eed7SJeremy Kerr return 1; 733dd37eed7SJeremy Kerr } 734dd37eed7SJeremy Kerr 735dd37eed7SJeremy Kerr return 0; 736dd37eed7SJeremy Kerr } 737dd37eed7SJeremy Kerr 738356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 739356d8009SChristopher Bostic { 740356d8009SChristopher Bostic if (!fsi_drv) 741356d8009SChristopher Bostic return -EINVAL; 742356d8009SChristopher Bostic if (!fsi_drv->id_table) 743356d8009SChristopher Bostic return -EINVAL; 744356d8009SChristopher Bostic 745356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 746356d8009SChristopher Bostic } 747356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 748356d8009SChristopher Bostic 749356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 750356d8009SChristopher Bostic { 751356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 752356d8009SChristopher Bostic } 753356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 754356d8009SChristopher Bostic 7550508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 7560508ad1fSJeremy Kerr .name = "fsi", 757dd37eed7SJeremy Kerr .match = fsi_bus_match, 7580508ad1fSJeremy Kerr }; 7590508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 7600508ad1fSJeremy Kerr 7610508ad1fSJeremy Kerr static int fsi_init(void) 7620508ad1fSJeremy Kerr { 7630508ad1fSJeremy Kerr return bus_register(&fsi_bus_type); 7640508ad1fSJeremy Kerr } 7650508ad1fSJeremy Kerr 7660508ad1fSJeremy Kerr static void fsi_exit(void) 7670508ad1fSJeremy Kerr { 7680508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 7690508ad1fSJeremy Kerr } 7700508ad1fSJeremy Kerr 7710508ad1fSJeremy Kerr module_init(fsi_init); 7720508ad1fSJeremy Kerr module_exit(fsi_exit); 773