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 */ 501fa847d7SJeremy Kerr #define FSI_SISC 0x8 /* R/W: Interrupt condition */ 511fa847d7SJeremy Kerr #define FSI_SSTAT 0x14 /* R : Slave status */ 522b37c3e2SChristopher Bostic 532b37c3e2SChristopher Bostic /* 542b37c3e2SChristopher Bostic * SMODE fields 552b37c3e2SChristopher Bostic */ 562b37c3e2SChristopher Bostic #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ 572b37c3e2SChristopher Bostic #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ 582b37c3e2SChristopher Bostic #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ 592b37c3e2SChristopher Bostic #define FSI_SMODE_SID_MASK 3 /* ID Mask */ 602b37c3e2SChristopher Bostic #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ 612b37c3e2SChristopher Bostic #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ 622b37c3e2SChristopher Bostic #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ 632b37c3e2SChristopher Bostic #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ 642b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ 652b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ 662b37c3e2SChristopher Bostic 672b545cd8SJeremy Kerr #define FSI_SLAVE_SIZE_23b 0x800000 682b545cd8SJeremy Kerr 6909aecfabSJeremy Kerr static DEFINE_IDA(master_ida); 7009aecfabSJeremy Kerr 71faf0b116SJeremy Kerr struct fsi_slave { 72faf0b116SJeremy Kerr struct device dev; 73faf0b116SJeremy Kerr struct fsi_master *master; 74faf0b116SJeremy Kerr int id; 75faf0b116SJeremy Kerr int link; 76faf0b116SJeremy Kerr uint32_t size; /* size of slave address space */ 77faf0b116SJeremy Kerr }; 78faf0b116SJeremy Kerr 79cd0fdb5cSChristopher Bostic #define to_fsi_master(d) container_of(d, struct fsi_master, dev) 80faf0b116SJeremy Kerr #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) 81faf0b116SJeremy Kerr 821fa847d7SJeremy Kerr static const int slave_retries = 2; 831fa847d7SJeremy Kerr static int discard_errors; 841fa847d7SJeremy Kerr 85014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 86014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 87014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 88014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 891fa847d7SJeremy Kerr static int fsi_master_break(struct fsi_master *master, int link); 90014c2abcSJeremy Kerr 914efe37f4SJeremy Kerr /* 924efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 934efe37f4SJeremy Kerr * 944efe37f4SJeremy Kerr * FSI endpoint-device support 954efe37f4SJeremy Kerr * 964efe37f4SJeremy Kerr * Read / write / peek accessors for a client 974efe37f4SJeremy Kerr * 984efe37f4SJeremy Kerr * Parameters: 994efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 1004efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 1014efe37f4SJeremy Kerr * plus desired offset to access its register space. 1024efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 1034efe37f4SJeremy Kerr * write this is value to write to the specified address. 1044efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 1054efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1064efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1074efe37f4SJeremy Kerr */ 1084efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1094efe37f4SJeremy Kerr size_t size) 1104efe37f4SJeremy Kerr { 1114efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1124efe37f4SJeremy Kerr return -EINVAL; 1134efe37f4SJeremy Kerr 1144efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1154efe37f4SJeremy Kerr } 1164efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1174efe37f4SJeremy Kerr 1184efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1194efe37f4SJeremy Kerr size_t size) 1204efe37f4SJeremy Kerr { 1214efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1224efe37f4SJeremy Kerr return -EINVAL; 1234efe37f4SJeremy Kerr 1244efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1254efe37f4SJeremy Kerr } 1264efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1274efe37f4SJeremy Kerr 1284efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1294efe37f4SJeremy Kerr { 1304efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1314efe37f4SJeremy Kerr 1324efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1334efe37f4SJeremy Kerr } 134f7ade2a6SJeremy Kerr 135f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 136f7ade2a6SJeremy Kerr { 137f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 138f7ade2a6SJeremy Kerr 139f7ade2a6SJeremy Kerr kfree(device); 140f7ade2a6SJeremy Kerr } 141f7ade2a6SJeremy Kerr 142f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 143f7ade2a6SJeremy Kerr { 144f7ade2a6SJeremy Kerr struct fsi_device *dev; 145f7ade2a6SJeremy Kerr 146f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 147f7ade2a6SJeremy Kerr if (!dev) 148f7ade2a6SJeremy Kerr return NULL; 149f7ade2a6SJeremy Kerr 150f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 151f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 152f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 153f7ade2a6SJeremy Kerr 154f7ade2a6SJeremy Kerr return dev; 155f7ade2a6SJeremy Kerr } 156f7ade2a6SJeremy Kerr 157414c1026SJeremy Kerr /* FSI slave support */ 158014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 159014c2abcSJeremy Kerr uint8_t *idp) 160014c2abcSJeremy Kerr { 161014c2abcSJeremy Kerr uint32_t addr = *addrp; 162014c2abcSJeremy Kerr uint8_t id = *idp; 163014c2abcSJeremy Kerr 164014c2abcSJeremy Kerr if (addr > slave->size) 165014c2abcSJeremy Kerr return -EINVAL; 166014c2abcSJeremy Kerr 167014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 168014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 169014c2abcSJeremy Kerr */ 170014c2abcSJeremy Kerr if (addr > 0x1fffff) { 171014c2abcSJeremy Kerr if (slave->id != 0) 172014c2abcSJeremy Kerr return -EINVAL; 173014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 174014c2abcSJeremy Kerr addr &= 0x1fffff; 175014c2abcSJeremy Kerr } 176014c2abcSJeremy Kerr 177014c2abcSJeremy Kerr *addrp = addr; 178014c2abcSJeremy Kerr *idp = id; 179014c2abcSJeremy Kerr return 0; 180014c2abcSJeremy Kerr } 181014c2abcSJeremy Kerr 1821fa847d7SJeremy Kerr int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) 1831fa847d7SJeremy Kerr { 1841fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 1851fa847d7SJeremy Kerr uint32_t irq, stat; 1861fa847d7SJeremy Kerr int rc, link; 1871fa847d7SJeremy Kerr uint8_t id; 1881fa847d7SJeremy Kerr 1891fa847d7SJeremy Kerr link = slave->link; 1901fa847d7SJeremy Kerr id = slave->id; 1911fa847d7SJeremy Kerr 1921fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 1931fa847d7SJeremy Kerr &irq, sizeof(irq)); 1941fa847d7SJeremy Kerr if (rc) 1951fa847d7SJeremy Kerr return rc; 1961fa847d7SJeremy Kerr 1971fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, 1981fa847d7SJeremy Kerr &stat, sizeof(stat)); 1991fa847d7SJeremy Kerr if (rc) 2001fa847d7SJeremy Kerr return rc; 2011fa847d7SJeremy Kerr 2021fa847d7SJeremy Kerr dev_info(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", 2031fa847d7SJeremy Kerr be32_to_cpu(stat), be32_to_cpu(irq)); 2041fa847d7SJeremy Kerr 2051fa847d7SJeremy Kerr /* clear interrupts */ 2061fa847d7SJeremy Kerr return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2071fa847d7SJeremy Kerr &irq, sizeof(irq)); 2081fa847d7SJeremy Kerr } 2091fa847d7SJeremy Kerr 2101fa847d7SJeremy Kerr static int fsi_slave_set_smode(struct fsi_master *master, int link, int id); 2111fa847d7SJeremy Kerr 2121fa847d7SJeremy Kerr int fsi_slave_handle_error(struct fsi_slave *slave, bool write, uint32_t addr, 2131fa847d7SJeremy Kerr size_t size) 2141fa847d7SJeremy Kerr { 2151fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 2161fa847d7SJeremy Kerr int rc, link; 2171fa847d7SJeremy Kerr uint32_t reg; 2181fa847d7SJeremy Kerr uint8_t id; 2191fa847d7SJeremy Kerr 2201fa847d7SJeremy Kerr if (discard_errors) 2211fa847d7SJeremy Kerr return -1; 2221fa847d7SJeremy Kerr 2231fa847d7SJeremy Kerr link = slave->link; 2241fa847d7SJeremy Kerr id = slave->id; 2251fa847d7SJeremy Kerr 2261fa847d7SJeremy Kerr dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", 2271fa847d7SJeremy Kerr write ? "write" : "read", addr, size); 2281fa847d7SJeremy Kerr 2291fa847d7SJeremy Kerr /* try a simple clear of error conditions, which may fail if we've lost 2301fa847d7SJeremy Kerr * communication with the slave 2311fa847d7SJeremy Kerr */ 2321fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 2331fa847d7SJeremy Kerr if (!rc) 2341fa847d7SJeremy Kerr return 0; 2351fa847d7SJeremy Kerr 2361fa847d7SJeremy Kerr /* send a TERM and retry */ 2371fa847d7SJeremy Kerr if (master->term) { 2381fa847d7SJeremy Kerr rc = master->term(master, link, id); 2391fa847d7SJeremy Kerr if (!rc) { 2401fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, 0, 2411fa847d7SJeremy Kerr ®, sizeof(reg)); 2421fa847d7SJeremy Kerr if (!rc) 2431fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 2441fa847d7SJeremy Kerr if (!rc) 2451fa847d7SJeremy Kerr return 0; 2461fa847d7SJeremy Kerr } 2471fa847d7SJeremy Kerr } 2481fa847d7SJeremy Kerr 2491fa847d7SJeremy Kerr /* getting serious, reset the slave via BREAK */ 2501fa847d7SJeremy Kerr rc = fsi_master_break(master, link); 2511fa847d7SJeremy Kerr if (rc) 2521fa847d7SJeremy Kerr return rc; 2531fa847d7SJeremy Kerr 2541fa847d7SJeremy Kerr rc = fsi_slave_set_smode(master, link, id); 2551fa847d7SJeremy Kerr if (rc) 2561fa847d7SJeremy Kerr return rc; 2571fa847d7SJeremy Kerr 2581fa847d7SJeremy Kerr return fsi_slave_report_and_clear_errors(slave); 2591fa847d7SJeremy Kerr } 2601fa847d7SJeremy Kerr 261da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 262014c2abcSJeremy Kerr void *val, size_t size) 263014c2abcSJeremy Kerr { 264014c2abcSJeremy Kerr uint8_t id = slave->id; 2651fa847d7SJeremy Kerr int rc, err_rc, i; 266014c2abcSJeremy Kerr 267014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 268014c2abcSJeremy Kerr if (rc) 269014c2abcSJeremy Kerr return rc; 270014c2abcSJeremy Kerr 2711fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 2721fa847d7SJeremy Kerr rc = fsi_master_read(slave->master, slave->link, 2731fa847d7SJeremy Kerr id, addr, val, size); 2741fa847d7SJeremy Kerr if (!rc) 2751fa847d7SJeremy Kerr break; 2761fa847d7SJeremy Kerr 2771fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, false, addr, size); 2781fa847d7SJeremy Kerr if (err_rc) 2791fa847d7SJeremy Kerr break; 2801fa847d7SJeremy Kerr } 2811fa847d7SJeremy Kerr 2821fa847d7SJeremy Kerr return rc; 283014c2abcSJeremy Kerr } 284da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 285014c2abcSJeremy Kerr 286da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 287014c2abcSJeremy Kerr const void *val, size_t size) 288014c2abcSJeremy Kerr { 289014c2abcSJeremy Kerr uint8_t id = slave->id; 2901fa847d7SJeremy Kerr int rc, err_rc, i; 291014c2abcSJeremy Kerr 292014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 293014c2abcSJeremy Kerr if (rc) 294014c2abcSJeremy Kerr return rc; 295014c2abcSJeremy Kerr 2961fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 2971fa847d7SJeremy Kerr rc = fsi_master_write(slave->master, slave->link, 2981fa847d7SJeremy Kerr id, addr, val, size); 2991fa847d7SJeremy Kerr if (!rc) 3001fa847d7SJeremy Kerr break; 3011fa847d7SJeremy Kerr 3021fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, true, addr, size); 3031fa847d7SJeremy Kerr if (err_rc) 3041fa847d7SJeremy Kerr break; 3051fa847d7SJeremy Kerr } 3061fa847d7SJeremy Kerr 3071fa847d7SJeremy Kerr return rc; 308014c2abcSJeremy Kerr } 309da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 310da36cadfSJeremy Kerr 311da36cadfSJeremy Kerr extern int fsi_slave_claim_range(struct fsi_slave *slave, 312da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 313da36cadfSJeremy Kerr { 314da36cadfSJeremy Kerr if (addr + size < addr) 315da36cadfSJeremy Kerr return -EINVAL; 316da36cadfSJeremy Kerr 317da36cadfSJeremy Kerr if (addr + size > slave->size) 318da36cadfSJeremy Kerr return -EINVAL; 319da36cadfSJeremy Kerr 320da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 321da36cadfSJeremy Kerr return 0; 322da36cadfSJeremy Kerr } 323da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 324da36cadfSJeremy Kerr 325da36cadfSJeremy Kerr extern void fsi_slave_release_range(struct fsi_slave *slave, 326da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 327da36cadfSJeremy Kerr { 328da36cadfSJeremy Kerr } 329da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 330014c2abcSJeremy Kerr 331f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 332f7ade2a6SJeremy Kerr { 333f7ade2a6SJeremy Kerr uint32_t engine_addr; 334f7ade2a6SJeremy Kerr uint32_t conf; 335f7ade2a6SJeremy Kerr int rc, i; 336f7ade2a6SJeremy Kerr 337f7ade2a6SJeremy Kerr /* 338f7ade2a6SJeremy Kerr * scan engines 339f7ade2a6SJeremy Kerr * 340f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 341f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 342f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 343f7ade2a6SJeremy Kerr */ 344f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 345f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 346f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 347f7ade2a6SJeremy Kerr struct fsi_device *dev; 348f7ade2a6SJeremy Kerr 349f7ade2a6SJeremy Kerr rc = fsi_slave_read(slave, (i + 1) * sizeof(conf), 350f7ade2a6SJeremy Kerr &conf, sizeof(conf)); 351f7ade2a6SJeremy Kerr if (rc) { 352f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 353f7ade2a6SJeremy Kerr "error reading slave registers\n"); 354f7ade2a6SJeremy Kerr return -1; 355f7ade2a6SJeremy Kerr } 356f7ade2a6SJeremy Kerr conf = be32_to_cpu(conf); 357f7ade2a6SJeremy Kerr 358f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 359f7ade2a6SJeremy Kerr if (crc) { 360f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 361f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 362f7ade2a6SJeremy Kerr i); 363f7ade2a6SJeremy Kerr return -1; 364f7ade2a6SJeremy Kerr } 365f7ade2a6SJeremy Kerr 366f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 367f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 368f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 369f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 370f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 371f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 372f7ade2a6SJeremy Kerr 373f7ade2a6SJeremy Kerr /* 374f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 375f7ade2a6SJeremy Kerr * skips the defined address areas 376f7ade2a6SJeremy Kerr */ 377f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 378f7ade2a6SJeremy Kerr 379f7ade2a6SJeremy Kerr /* create device */ 380f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 381f7ade2a6SJeremy Kerr if (!dev) 382f7ade2a6SJeremy Kerr return -ENOMEM; 383f7ade2a6SJeremy Kerr 384f7ade2a6SJeremy Kerr dev->slave = slave; 385f7ade2a6SJeremy Kerr dev->engine_type = type; 386f7ade2a6SJeremy Kerr dev->version = version; 387f7ade2a6SJeremy Kerr dev->unit = i; 388f7ade2a6SJeremy Kerr dev->addr = engine_addr; 389f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 390f7ade2a6SJeremy Kerr 391f7ade2a6SJeremy Kerr dev_dbg(&slave->dev, 392f7ade2a6SJeremy Kerr "engine[%i]: type %x, version %x, addr %x size %x\n", 393f7ade2a6SJeremy Kerr dev->unit, dev->engine_type, version, 394f7ade2a6SJeremy Kerr dev->addr, dev->size); 395f7ade2a6SJeremy Kerr 396f7ade2a6SJeremy Kerr dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", 397f7ade2a6SJeremy Kerr slave->master->idx, slave->link, 398f7ade2a6SJeremy Kerr slave->id, i - 2); 399f7ade2a6SJeremy Kerr 400f7ade2a6SJeremy Kerr rc = device_register(&dev->dev); 401f7ade2a6SJeremy Kerr if (rc) { 402f7ade2a6SJeremy Kerr dev_warn(&slave->dev, "add failed: %d\n", rc); 403f7ade2a6SJeremy Kerr put_device(&dev->dev); 404f7ade2a6SJeremy Kerr } 405f7ade2a6SJeremy Kerr } 406f7ade2a6SJeremy Kerr 407f7ade2a6SJeremy Kerr engine_addr += slots * engine_page_size; 408f7ade2a6SJeremy Kerr 409f7ade2a6SJeremy Kerr if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) 410f7ade2a6SJeremy Kerr break; 411f7ade2a6SJeremy Kerr } 412f7ade2a6SJeremy Kerr 413f7ade2a6SJeremy Kerr return 0; 414f7ade2a6SJeremy Kerr } 415f7ade2a6SJeremy Kerr 416125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 417125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 418125739cbSJeremy Kerr loff_t off, size_t count) 419125739cbSJeremy Kerr { 420125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 421125739cbSJeremy Kerr size_t total_len, read_len; 422125739cbSJeremy Kerr int rc; 423125739cbSJeremy Kerr 424125739cbSJeremy Kerr if (off < 0) 425125739cbSJeremy Kerr return -EINVAL; 426125739cbSJeremy Kerr 427125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 428125739cbSJeremy Kerr return -EINVAL; 429125739cbSJeremy Kerr 430125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += read_len) { 431125739cbSJeremy Kerr read_len = min_t(size_t, count, 4); 432125739cbSJeremy Kerr read_len -= off & 0x3; 433125739cbSJeremy Kerr 434125739cbSJeremy Kerr rc = fsi_slave_read(slave, off, buf + total_len, read_len); 435125739cbSJeremy Kerr if (rc) 436125739cbSJeremy Kerr return rc; 437125739cbSJeremy Kerr 438125739cbSJeremy Kerr off += read_len; 439125739cbSJeremy Kerr } 440125739cbSJeremy Kerr 441125739cbSJeremy Kerr return count; 442125739cbSJeremy Kerr } 443125739cbSJeremy Kerr 444125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_write(struct file *file, 445125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 446125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 447125739cbSJeremy Kerr { 448125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 449125739cbSJeremy Kerr size_t total_len, write_len; 450125739cbSJeremy Kerr int rc; 451125739cbSJeremy Kerr 452125739cbSJeremy Kerr if (off < 0) 453125739cbSJeremy Kerr return -EINVAL; 454125739cbSJeremy Kerr 455125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 456125739cbSJeremy Kerr return -EINVAL; 457125739cbSJeremy Kerr 458125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += write_len) { 459125739cbSJeremy Kerr write_len = min_t(size_t, count, 4); 460125739cbSJeremy Kerr write_len -= off & 0x3; 461125739cbSJeremy Kerr 462125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 463125739cbSJeremy Kerr if (rc) 464125739cbSJeremy Kerr return rc; 465125739cbSJeremy Kerr 466125739cbSJeremy Kerr off += write_len; 467125739cbSJeremy Kerr } 468125739cbSJeremy Kerr 469125739cbSJeremy Kerr return count; 470125739cbSJeremy Kerr } 471125739cbSJeremy Kerr 472125739cbSJeremy Kerr static struct bin_attribute fsi_slave_raw_attr = { 473125739cbSJeremy Kerr .attr = { 474125739cbSJeremy Kerr .name = "raw", 475125739cbSJeremy Kerr .mode = 0600, 476125739cbSJeremy Kerr }, 477125739cbSJeremy Kerr .size = 0, 478125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 479125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 480125739cbSJeremy Kerr }; 481125739cbSJeremy Kerr 482125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_term_write(struct file *file, 483125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 484125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 485125739cbSJeremy Kerr { 486125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 487125739cbSJeremy Kerr struct fsi_master *master = slave->master; 488125739cbSJeremy Kerr 489125739cbSJeremy Kerr if (!master->term) 490125739cbSJeremy Kerr return -ENODEV; 491125739cbSJeremy Kerr 492125739cbSJeremy Kerr master->term(master, slave->link, slave->id); 493125739cbSJeremy Kerr return count; 494125739cbSJeremy Kerr } 495125739cbSJeremy Kerr 496125739cbSJeremy Kerr static struct bin_attribute fsi_slave_term_attr = { 497125739cbSJeremy Kerr .attr = { 498125739cbSJeremy Kerr .name = "term", 499125739cbSJeremy Kerr .mode = 0200, 500125739cbSJeremy Kerr }, 501125739cbSJeremy Kerr .size = 0, 502125739cbSJeremy Kerr .write = fsi_slave_sysfs_term_write, 503125739cbSJeremy Kerr }; 504125739cbSJeremy Kerr 5052b37c3e2SChristopher Bostic /* Encode slave local bus echo delay */ 5062b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_echodly(int x) 5072b37c3e2SChristopher Bostic { 5082b37c3e2SChristopher Bostic return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 5092b37c3e2SChristopher Bostic } 5102b37c3e2SChristopher Bostic 5112b37c3e2SChristopher Bostic /* Encode slave local bus send delay */ 5122b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_senddly(int x) 5132b37c3e2SChristopher Bostic { 5142b37c3e2SChristopher Bostic return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 5152b37c3e2SChristopher Bostic } 5162b37c3e2SChristopher Bostic 5172b37c3e2SChristopher Bostic /* Encode slave local bus clock rate ratio */ 5182b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_lbcrr(int x) 5192b37c3e2SChristopher Bostic { 5202b37c3e2SChristopher Bostic return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 5212b37c3e2SChristopher Bostic } 5222b37c3e2SChristopher Bostic 5232b37c3e2SChristopher Bostic /* Encode slave ID */ 5242b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_sid(int x) 5252b37c3e2SChristopher Bostic { 5262b37c3e2SChristopher Bostic return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 5272b37c3e2SChristopher Bostic } 5282b37c3e2SChristopher Bostic 5292b37c3e2SChristopher Bostic static const uint32_t fsi_slave_smode(int id) 5302b37c3e2SChristopher Bostic { 5312b37c3e2SChristopher Bostic return FSI_SMODE_WSC | FSI_SMODE_ECRC 5322b37c3e2SChristopher Bostic | fsi_smode_sid(id) 5332b37c3e2SChristopher Bostic | fsi_smode_echodly(0xf) | fsi_smode_senddly(0xf) 5342b37c3e2SChristopher Bostic | fsi_smode_lbcrr(0x8); 5352b37c3e2SChristopher Bostic } 5362b37c3e2SChristopher Bostic 5372b37c3e2SChristopher Bostic static int fsi_slave_set_smode(struct fsi_master *master, int link, int id) 5382b37c3e2SChristopher Bostic { 5392b37c3e2SChristopher Bostic uint32_t smode; 5402b37c3e2SChristopher Bostic 5412b37c3e2SChristopher Bostic /* set our smode register with the slave ID field to 0; this enables 5422b37c3e2SChristopher Bostic * extended slave addressing 5432b37c3e2SChristopher Bostic */ 5442b37c3e2SChristopher Bostic smode = fsi_slave_smode(id); 5452b37c3e2SChristopher Bostic smode = cpu_to_be32(smode); 5462b37c3e2SChristopher Bostic 5472b37c3e2SChristopher Bostic return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SMODE, 5482b37c3e2SChristopher Bostic &smode, sizeof(smode)); 5492b37c3e2SChristopher Bostic } 5502b37c3e2SChristopher Bostic 5512b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 5522b545cd8SJeremy Kerr { 5532b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 5542b545cd8SJeremy Kerr 5552b545cd8SJeremy Kerr kfree(slave); 5562b545cd8SJeremy Kerr } 5572b545cd8SJeremy Kerr 558414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 559414c1026SJeremy Kerr { 5602b545cd8SJeremy Kerr struct fsi_slave *slave; 5612b545cd8SJeremy Kerr uint32_t chip_id; 5622b545cd8SJeremy Kerr uint8_t crc; 5632b545cd8SJeremy Kerr int rc; 564414c1026SJeremy Kerr 5652b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 5662b545cd8SJeremy Kerr * full 23-bit address range 5672b545cd8SJeremy Kerr */ 5682b545cd8SJeremy Kerr if (id != 0) 5692b545cd8SJeremy Kerr return -EINVAL; 5702b545cd8SJeremy Kerr 5712b545cd8SJeremy Kerr rc = fsi_master_read(master, link, id, 0, &chip_id, sizeof(chip_id)); 5722b545cd8SJeremy Kerr if (rc) { 5732b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 5742b545cd8SJeremy Kerr link, id, rc); 575414c1026SJeremy Kerr return -ENODEV; 576414c1026SJeremy Kerr } 5772b545cd8SJeremy Kerr chip_id = be32_to_cpu(chip_id); 5782b545cd8SJeremy Kerr 5792b545cd8SJeremy Kerr crc = crc4(0, chip_id, 32); 5802b545cd8SJeremy Kerr if (crc) { 5812b545cd8SJeremy Kerr dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n", 5822b545cd8SJeremy Kerr link, id); 5832b545cd8SJeremy Kerr return -EIO; 5842b545cd8SJeremy Kerr } 5852b545cd8SJeremy Kerr 5862b545cd8SJeremy Kerr dev_info(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 5872b545cd8SJeremy Kerr chip_id, master->idx, link, id); 5882b545cd8SJeremy Kerr 5892b37c3e2SChristopher Bostic rc = fsi_slave_set_smode(master, link, id); 5902b37c3e2SChristopher Bostic if (rc) { 5912b37c3e2SChristopher Bostic dev_warn(&master->dev, 5922b37c3e2SChristopher Bostic "can't set smode on slave:%02x:%02x %d\n", 5932b37c3e2SChristopher Bostic link, id, rc); 5942b37c3e2SChristopher Bostic return -ENODEV; 5952b37c3e2SChristopher Bostic } 5962b37c3e2SChristopher Bostic 5972b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 5982b545cd8SJeremy Kerr * register. 5992b545cd8SJeremy Kerr */ 6002b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 6012b545cd8SJeremy Kerr if (!slave) 6022b545cd8SJeremy Kerr return -ENOMEM; 6032b545cd8SJeremy Kerr 6042b545cd8SJeremy Kerr slave->master = master; 6052b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 6062b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 6072b545cd8SJeremy Kerr slave->link = link; 6082b545cd8SJeremy Kerr slave->id = id; 6092b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 6102b545cd8SJeremy Kerr 6112b545cd8SJeremy Kerr dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 6122b545cd8SJeremy Kerr rc = device_register(&slave->dev); 6132b545cd8SJeremy Kerr if (rc < 0) { 6142b545cd8SJeremy Kerr dev_warn(&master->dev, "failed to create slave device: %d\n", 6152b545cd8SJeremy Kerr rc); 6162b545cd8SJeremy Kerr put_device(&slave->dev); 6172b545cd8SJeremy Kerr return rc; 6182b545cd8SJeremy Kerr } 6192b545cd8SJeremy Kerr 620125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 621125739cbSJeremy Kerr if (rc) 622125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 623125739cbSJeremy Kerr 624125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_term_attr); 625125739cbSJeremy Kerr if (rc) 626125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create term attr: %d\n", rc); 627125739cbSJeremy Kerr 628f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 629f7ade2a6SJeremy Kerr if (rc) 630f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 631f7ade2a6SJeremy Kerr rc); 6322b545cd8SJeremy Kerr 6332b545cd8SJeremy Kerr return rc; 6342b545cd8SJeremy Kerr } 635414c1026SJeremy Kerr 63609aecfabSJeremy Kerr /* FSI master support */ 637014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 638014c2abcSJeremy Kerr { 639014c2abcSJeremy Kerr if (size != 1 && size != 2 && size != 4) 640014c2abcSJeremy Kerr return -EINVAL; 641014c2abcSJeremy Kerr 642014c2abcSJeremy Kerr if ((addr & 0x3) != (size & 0x3)) 643014c2abcSJeremy Kerr return -EINVAL; 644014c2abcSJeremy Kerr 645014c2abcSJeremy Kerr return 0; 646014c2abcSJeremy Kerr } 647014c2abcSJeremy Kerr 648014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 649014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 650014c2abcSJeremy Kerr { 651014c2abcSJeremy Kerr int rc; 652014c2abcSJeremy Kerr 65366433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 654014c2abcSJeremy Kerr 65566433b05SJeremy Kerr rc = fsi_check_access(addr, size); 65666433b05SJeremy Kerr if (!rc) 65766433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 65866433b05SJeremy Kerr 65966433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 66066433b05SJeremy Kerr false, val, rc); 66166433b05SJeremy Kerr 66266433b05SJeremy Kerr return rc; 663014c2abcSJeremy Kerr } 664014c2abcSJeremy Kerr 665014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 666014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 667014c2abcSJeremy Kerr { 668014c2abcSJeremy Kerr int rc; 669014c2abcSJeremy Kerr 67066433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 671014c2abcSJeremy Kerr 67266433b05SJeremy Kerr rc = fsi_check_access(addr, size); 67366433b05SJeremy Kerr if (!rc) 67466433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 67566433b05SJeremy Kerr 67666433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 67766433b05SJeremy Kerr true, val, rc); 67866433b05SJeremy Kerr 67966433b05SJeremy Kerr return rc; 680014c2abcSJeremy Kerr } 681014c2abcSJeremy Kerr 68226095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 68326095282SChristopher Bostic { 68426095282SChristopher Bostic if (master->link_enable) 68526095282SChristopher Bostic return master->link_enable(master, link); 68626095282SChristopher Bostic 68726095282SChristopher Bostic return 0; 68826095282SChristopher Bostic } 68926095282SChristopher Bostic 69026095282SChristopher Bostic /* 69126095282SChristopher Bostic * Issue a break command on this link 69226095282SChristopher Bostic */ 69326095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 69426095282SChristopher Bostic { 69566433b05SJeremy Kerr trace_fsi_master_break(master, link); 69666433b05SJeremy Kerr 69726095282SChristopher Bostic if (master->send_break) 69826095282SChristopher Bostic return master->send_break(master, link); 69926095282SChristopher Bostic 70026095282SChristopher Bostic return 0; 70126095282SChristopher Bostic } 70226095282SChristopher Bostic 703414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 704414c1026SJeremy Kerr { 70526095282SChristopher Bostic int link, rc; 706414c1026SJeremy Kerr 70726095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 70826095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 70926095282SChristopher Bostic if (rc) { 71026095282SChristopher Bostic dev_dbg(&master->dev, 71126095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 71226095282SChristopher Bostic continue; 71326095282SChristopher Bostic } 71426095282SChristopher Bostic rc = fsi_master_break(master, link); 71526095282SChristopher Bostic if (rc) { 71626095282SChristopher Bostic dev_dbg(&master->dev, 71726095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 71826095282SChristopher Bostic continue; 71926095282SChristopher Bostic } 72026095282SChristopher Bostic 721414c1026SJeremy Kerr fsi_slave_init(master, link, 0); 72226095282SChristopher Bostic } 723414c1026SJeremy Kerr 724414c1026SJeremy Kerr return 0; 725414c1026SJeremy Kerr } 726414c1026SJeremy Kerr 727cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 728cd0fdb5cSChristopher Bostic { 729cd0fdb5cSChristopher Bostic device_unregister(dev); 730cd0fdb5cSChristopher Bostic return 0; 731cd0fdb5cSChristopher Bostic } 732cd0fdb5cSChristopher Bostic 733cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 734cd0fdb5cSChristopher Bostic { 735cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 736cd0fdb5cSChristopher Bostic device_unregister(dev); 737cd0fdb5cSChristopher Bostic return 0; 738cd0fdb5cSChristopher Bostic } 739cd0fdb5cSChristopher Bostic 740cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 741cd0fdb5cSChristopher Bostic { 742cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 743cd0fdb5cSChristopher Bostic } 744cd0fdb5cSChristopher Bostic 745cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 746cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 747cd0fdb5cSChristopher Bostic { 748cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 749cd0fdb5cSChristopher Bostic int rc; 750cd0fdb5cSChristopher Bostic 751cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 752cd0fdb5cSChristopher Bostic rc = fsi_master_scan(master); 753cd0fdb5cSChristopher Bostic if (rc < 0) 754cd0fdb5cSChristopher Bostic return rc; 755cd0fdb5cSChristopher Bostic 756cd0fdb5cSChristopher Bostic return count; 757cd0fdb5cSChristopher Bostic } 758cd0fdb5cSChristopher Bostic 759cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 760cd0fdb5cSChristopher Bostic 761125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 762125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 763125739cbSJeremy Kerr { 764125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 765125739cbSJeremy Kerr 766125739cbSJeremy Kerr fsi_master_break(master, 0); 767125739cbSJeremy Kerr 768125739cbSJeremy Kerr return count; 769125739cbSJeremy Kerr } 770125739cbSJeremy Kerr 771125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 772125739cbSJeremy Kerr 77309aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 77409aecfabSJeremy Kerr { 77509aecfabSJeremy Kerr int rc; 77609aecfabSJeremy Kerr 77709aecfabSJeremy Kerr if (!master) 77809aecfabSJeremy Kerr return -EINVAL; 77909aecfabSJeremy Kerr 78009aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 78109aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 78209aecfabSJeremy Kerr 78309aecfabSJeremy Kerr rc = device_register(&master->dev); 784414c1026SJeremy Kerr if (rc) { 78509aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 78609aecfabSJeremy Kerr return rc; 78709aecfabSJeremy Kerr } 788414c1026SJeremy Kerr 789cd0fdb5cSChristopher Bostic rc = device_create_file(&master->dev, &dev_attr_rescan); 790cd0fdb5cSChristopher Bostic if (rc) { 791cd0fdb5cSChristopher Bostic device_unregister(&master->dev); 792cd0fdb5cSChristopher Bostic ida_simple_remove(&master_ida, master->idx); 793cd0fdb5cSChristopher Bostic return rc; 794cd0fdb5cSChristopher Bostic } 795cd0fdb5cSChristopher Bostic 796125739cbSJeremy Kerr rc = device_create_file(&master->dev, &dev_attr_break); 797125739cbSJeremy Kerr if (rc) { 798125739cbSJeremy Kerr device_unregister(&master->dev); 799125739cbSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 800125739cbSJeremy Kerr return rc; 801125739cbSJeremy Kerr } 802125739cbSJeremy Kerr 803414c1026SJeremy Kerr fsi_master_scan(master); 804cd0fdb5cSChristopher Bostic 805414c1026SJeremy Kerr return 0; 806414c1026SJeremy Kerr } 80709aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 80809aecfabSJeremy Kerr 80909aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 81009aecfabSJeremy Kerr { 81109aecfabSJeremy Kerr if (master->idx >= 0) { 81209aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 81309aecfabSJeremy Kerr master->idx = -1; 81409aecfabSJeremy Kerr } 81509aecfabSJeremy Kerr 816cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 81709aecfabSJeremy Kerr device_unregister(&master->dev); 81809aecfabSJeremy Kerr } 81909aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 82009aecfabSJeremy Kerr 8210508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 8220508ad1fSJeremy Kerr 823dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 824dd37eed7SJeremy Kerr { 825dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 826dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 827dd37eed7SJeremy Kerr const struct fsi_device_id *id; 828dd37eed7SJeremy Kerr 829dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 830dd37eed7SJeremy Kerr return 0; 831dd37eed7SJeremy Kerr 832dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 833dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 834dd37eed7SJeremy Kerr continue; 835dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 836dd37eed7SJeremy Kerr id->version == fsi_dev->version) 837dd37eed7SJeremy Kerr return 1; 838dd37eed7SJeremy Kerr } 839dd37eed7SJeremy Kerr 840dd37eed7SJeremy Kerr return 0; 841dd37eed7SJeremy Kerr } 842dd37eed7SJeremy Kerr 843356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 844356d8009SChristopher Bostic { 845356d8009SChristopher Bostic if (!fsi_drv) 846356d8009SChristopher Bostic return -EINVAL; 847356d8009SChristopher Bostic if (!fsi_drv->id_table) 848356d8009SChristopher Bostic return -EINVAL; 849356d8009SChristopher Bostic 850356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 851356d8009SChristopher Bostic } 852356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 853356d8009SChristopher Bostic 854356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 855356d8009SChristopher Bostic { 856356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 857356d8009SChristopher Bostic } 858356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 859356d8009SChristopher Bostic 8600508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 8610508ad1fSJeremy Kerr .name = "fsi", 862dd37eed7SJeremy Kerr .match = fsi_bus_match, 8630508ad1fSJeremy Kerr }; 8640508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 8650508ad1fSJeremy Kerr 8660508ad1fSJeremy Kerr static int fsi_init(void) 8670508ad1fSJeremy Kerr { 8680508ad1fSJeremy Kerr return bus_register(&fsi_bus_type); 8690508ad1fSJeremy Kerr } 8700508ad1fSJeremy Kerr 8710508ad1fSJeremy Kerr static void fsi_exit(void) 8720508ad1fSJeremy Kerr { 8730508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 8740508ad1fSJeremy Kerr } 8750508ad1fSJeremy Kerr 8760508ad1fSJeremy Kerr module_init(fsi_init); 8770508ad1fSJeremy Kerr module_exit(fsi_exit); 8781fa847d7SJeremy Kerr module_param(discard_errors, int, 0664); 8791fa847d7SJeremy Kerr MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); 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