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 */ 524af889b0SJeremy Kerr #define FSI_LLMODE 0x100 /* R/W: Link layer mode register */ 532b37c3e2SChristopher Bostic 542b37c3e2SChristopher Bostic /* 552b37c3e2SChristopher Bostic * SMODE fields 562b37c3e2SChristopher Bostic */ 572b37c3e2SChristopher Bostic #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ 582b37c3e2SChristopher Bostic #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ 592b37c3e2SChristopher Bostic #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ 602b37c3e2SChristopher Bostic #define FSI_SMODE_SID_MASK 3 /* ID Mask */ 612b37c3e2SChristopher Bostic #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ 622b37c3e2SChristopher Bostic #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ 632b37c3e2SChristopher Bostic #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ 642b37c3e2SChristopher Bostic #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ 652b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ 662b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ 672b37c3e2SChristopher Bostic 684af889b0SJeremy Kerr /* 694af889b0SJeremy Kerr * LLMODE fields 704af889b0SJeremy Kerr */ 714af889b0SJeremy Kerr #define FSI_LLMODE_ASYNC 0x1 724af889b0SJeremy Kerr 732b545cd8SJeremy Kerr #define FSI_SLAVE_SIZE_23b 0x800000 742b545cd8SJeremy Kerr 7509aecfabSJeremy Kerr static DEFINE_IDA(master_ida); 7609aecfabSJeremy Kerr 77faf0b116SJeremy Kerr struct fsi_slave { 78faf0b116SJeremy Kerr struct device dev; 79faf0b116SJeremy Kerr struct fsi_master *master; 80faf0b116SJeremy Kerr int id; 81faf0b116SJeremy Kerr int link; 82faf0b116SJeremy Kerr uint32_t size; /* size of slave address space */ 83faf0b116SJeremy Kerr }; 84faf0b116SJeremy Kerr 85cd0fdb5cSChristopher Bostic #define to_fsi_master(d) container_of(d, struct fsi_master, dev) 86faf0b116SJeremy Kerr #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) 87faf0b116SJeremy Kerr 881fa847d7SJeremy Kerr static const int slave_retries = 2; 891fa847d7SJeremy Kerr static int discard_errors; 901fa847d7SJeremy Kerr 91014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 92014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 93014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 94014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 951fa847d7SJeremy Kerr static int fsi_master_break(struct fsi_master *master, int link); 96014c2abcSJeremy Kerr 974efe37f4SJeremy Kerr /* 984efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 994efe37f4SJeremy Kerr * 1004efe37f4SJeremy Kerr * FSI endpoint-device support 1014efe37f4SJeremy Kerr * 1024efe37f4SJeremy Kerr * Read / write / peek accessors for a client 1034efe37f4SJeremy Kerr * 1044efe37f4SJeremy Kerr * Parameters: 1054efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 1064efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 1074efe37f4SJeremy Kerr * plus desired offset to access its register space. 1084efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 1094efe37f4SJeremy Kerr * write this is value to write to the specified address. 1104efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 1114efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1124efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1134efe37f4SJeremy Kerr */ 1144efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1154efe37f4SJeremy Kerr size_t size) 1164efe37f4SJeremy Kerr { 1174efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1184efe37f4SJeremy Kerr return -EINVAL; 1194efe37f4SJeremy Kerr 1204efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1214efe37f4SJeremy Kerr } 1224efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1234efe37f4SJeremy Kerr 1244efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1254efe37f4SJeremy Kerr size_t size) 1264efe37f4SJeremy Kerr { 1274efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1284efe37f4SJeremy Kerr return -EINVAL; 1294efe37f4SJeremy Kerr 1304efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1314efe37f4SJeremy Kerr } 1324efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1334efe37f4SJeremy Kerr 1344efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1354efe37f4SJeremy Kerr { 1364efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1374efe37f4SJeremy Kerr 1384efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1394efe37f4SJeremy Kerr } 140f7ade2a6SJeremy Kerr 141f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 142f7ade2a6SJeremy Kerr { 143f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 144f7ade2a6SJeremy Kerr 145f7ade2a6SJeremy Kerr kfree(device); 146f7ade2a6SJeremy Kerr } 147f7ade2a6SJeremy Kerr 148f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 149f7ade2a6SJeremy Kerr { 150f7ade2a6SJeremy Kerr struct fsi_device *dev; 151f7ade2a6SJeremy Kerr 152f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 153f7ade2a6SJeremy Kerr if (!dev) 154f7ade2a6SJeremy Kerr return NULL; 155f7ade2a6SJeremy Kerr 156f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 157f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 158f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 159f7ade2a6SJeremy Kerr 160f7ade2a6SJeremy Kerr return dev; 161f7ade2a6SJeremy Kerr } 162f7ade2a6SJeremy Kerr 163414c1026SJeremy Kerr /* FSI slave support */ 164014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 165014c2abcSJeremy Kerr uint8_t *idp) 166014c2abcSJeremy Kerr { 167014c2abcSJeremy Kerr uint32_t addr = *addrp; 168014c2abcSJeremy Kerr uint8_t id = *idp; 169014c2abcSJeremy Kerr 170014c2abcSJeremy Kerr if (addr > slave->size) 171014c2abcSJeremy Kerr return -EINVAL; 172014c2abcSJeremy Kerr 173014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 174014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 175014c2abcSJeremy Kerr */ 176014c2abcSJeremy Kerr if (addr > 0x1fffff) { 177014c2abcSJeremy Kerr if (slave->id != 0) 178014c2abcSJeremy Kerr return -EINVAL; 179014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 180014c2abcSJeremy Kerr addr &= 0x1fffff; 181014c2abcSJeremy Kerr } 182014c2abcSJeremy Kerr 183014c2abcSJeremy Kerr *addrp = addr; 184014c2abcSJeremy Kerr *idp = id; 185014c2abcSJeremy Kerr return 0; 186014c2abcSJeremy Kerr } 187014c2abcSJeremy Kerr 188ed50a089SColin Ian King static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) 1891fa847d7SJeremy Kerr { 1901fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 1911fa847d7SJeremy Kerr uint32_t irq, stat; 1921fa847d7SJeremy Kerr int rc, link; 1931fa847d7SJeremy Kerr uint8_t id; 1941fa847d7SJeremy Kerr 1951fa847d7SJeremy Kerr link = slave->link; 1961fa847d7SJeremy Kerr id = slave->id; 1971fa847d7SJeremy Kerr 1981fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 1991fa847d7SJeremy Kerr &irq, sizeof(irq)); 2001fa847d7SJeremy Kerr if (rc) 2011fa847d7SJeremy Kerr return rc; 2021fa847d7SJeremy Kerr 2031fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, 2041fa847d7SJeremy Kerr &stat, sizeof(stat)); 2051fa847d7SJeremy Kerr if (rc) 2061fa847d7SJeremy Kerr return rc; 2071fa847d7SJeremy Kerr 2081fa847d7SJeremy Kerr dev_info(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", 2091fa847d7SJeremy Kerr be32_to_cpu(stat), be32_to_cpu(irq)); 2101fa847d7SJeremy Kerr 2111fa847d7SJeremy Kerr /* clear interrupts */ 2121fa847d7SJeremy Kerr return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2131fa847d7SJeremy Kerr &irq, sizeof(irq)); 2141fa847d7SJeremy Kerr } 2151fa847d7SJeremy Kerr 2161fa847d7SJeremy Kerr static int fsi_slave_set_smode(struct fsi_master *master, int link, int id); 2171fa847d7SJeremy Kerr 218ed50a089SColin Ian King static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, 219ed50a089SColin Ian King uint32_t addr, size_t size) 2201fa847d7SJeremy Kerr { 2211fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 2221fa847d7SJeremy Kerr int rc, link; 2231fa847d7SJeremy Kerr uint32_t reg; 2241fa847d7SJeremy Kerr uint8_t id; 2251fa847d7SJeremy Kerr 2261fa847d7SJeremy Kerr if (discard_errors) 2271fa847d7SJeremy Kerr return -1; 2281fa847d7SJeremy Kerr 2291fa847d7SJeremy Kerr link = slave->link; 2301fa847d7SJeremy Kerr id = slave->id; 2311fa847d7SJeremy Kerr 2321fa847d7SJeremy Kerr dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", 2331fa847d7SJeremy Kerr write ? "write" : "read", addr, size); 2341fa847d7SJeremy Kerr 2351fa847d7SJeremy Kerr /* try a simple clear of error conditions, which may fail if we've lost 2361fa847d7SJeremy Kerr * communication with the slave 2371fa847d7SJeremy Kerr */ 2381fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 2391fa847d7SJeremy Kerr if (!rc) 2401fa847d7SJeremy Kerr return 0; 2411fa847d7SJeremy Kerr 2421fa847d7SJeremy Kerr /* send a TERM and retry */ 2431fa847d7SJeremy Kerr if (master->term) { 2441fa847d7SJeremy Kerr rc = master->term(master, link, id); 2451fa847d7SJeremy Kerr if (!rc) { 2461fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, 0, 2471fa847d7SJeremy Kerr ®, sizeof(reg)); 2481fa847d7SJeremy Kerr if (!rc) 2491fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 2501fa847d7SJeremy Kerr if (!rc) 2511fa847d7SJeremy Kerr return 0; 2521fa847d7SJeremy Kerr } 2531fa847d7SJeremy Kerr } 2541fa847d7SJeremy Kerr 2551fa847d7SJeremy Kerr /* getting serious, reset the slave via BREAK */ 2561fa847d7SJeremy Kerr rc = fsi_master_break(master, link); 2571fa847d7SJeremy Kerr if (rc) 2581fa847d7SJeremy Kerr return rc; 2591fa847d7SJeremy Kerr 2601fa847d7SJeremy Kerr rc = fsi_slave_set_smode(master, link, id); 2611fa847d7SJeremy Kerr if (rc) 2621fa847d7SJeremy Kerr return rc; 2631fa847d7SJeremy Kerr 2641fa847d7SJeremy Kerr return fsi_slave_report_and_clear_errors(slave); 2651fa847d7SJeremy Kerr } 2661fa847d7SJeremy Kerr 267da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 268014c2abcSJeremy Kerr void *val, size_t size) 269014c2abcSJeremy Kerr { 270014c2abcSJeremy Kerr uint8_t id = slave->id; 2711fa847d7SJeremy Kerr int rc, err_rc, i; 272014c2abcSJeremy Kerr 273014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 274014c2abcSJeremy Kerr if (rc) 275014c2abcSJeremy Kerr return rc; 276014c2abcSJeremy Kerr 2771fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 2781fa847d7SJeremy Kerr rc = fsi_master_read(slave->master, slave->link, 2791fa847d7SJeremy Kerr id, addr, val, size); 2801fa847d7SJeremy Kerr if (!rc) 2811fa847d7SJeremy Kerr break; 2821fa847d7SJeremy Kerr 2831fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, false, addr, size); 2841fa847d7SJeremy Kerr if (err_rc) 2851fa847d7SJeremy Kerr break; 2861fa847d7SJeremy Kerr } 2871fa847d7SJeremy Kerr 2881fa847d7SJeremy Kerr return rc; 289014c2abcSJeremy Kerr } 290da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 291014c2abcSJeremy Kerr 292da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 293014c2abcSJeremy Kerr const void *val, size_t size) 294014c2abcSJeremy Kerr { 295014c2abcSJeremy Kerr uint8_t id = slave->id; 2961fa847d7SJeremy Kerr int rc, err_rc, i; 297014c2abcSJeremy Kerr 298014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 299014c2abcSJeremy Kerr if (rc) 300014c2abcSJeremy Kerr return rc; 301014c2abcSJeremy Kerr 3021fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3031fa847d7SJeremy Kerr rc = fsi_master_write(slave->master, slave->link, 3041fa847d7SJeremy Kerr id, addr, val, size); 3051fa847d7SJeremy Kerr if (!rc) 3061fa847d7SJeremy Kerr break; 3071fa847d7SJeremy Kerr 3081fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, true, addr, size); 3091fa847d7SJeremy Kerr if (err_rc) 3101fa847d7SJeremy Kerr break; 3111fa847d7SJeremy Kerr } 3121fa847d7SJeremy Kerr 3131fa847d7SJeremy Kerr return rc; 314014c2abcSJeremy Kerr } 315da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 316da36cadfSJeremy Kerr 317da36cadfSJeremy Kerr extern int fsi_slave_claim_range(struct fsi_slave *slave, 318da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 319da36cadfSJeremy Kerr { 320da36cadfSJeremy Kerr if (addr + size < addr) 321da36cadfSJeremy Kerr return -EINVAL; 322da36cadfSJeremy Kerr 323da36cadfSJeremy Kerr if (addr + size > slave->size) 324da36cadfSJeremy Kerr return -EINVAL; 325da36cadfSJeremy Kerr 326da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 327da36cadfSJeremy Kerr return 0; 328da36cadfSJeremy Kerr } 329da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 330da36cadfSJeremy Kerr 331da36cadfSJeremy Kerr extern void fsi_slave_release_range(struct fsi_slave *slave, 332da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 333da36cadfSJeremy Kerr { 334da36cadfSJeremy Kerr } 335da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 336014c2abcSJeremy Kerr 337f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 338f7ade2a6SJeremy Kerr { 339f7ade2a6SJeremy Kerr uint32_t engine_addr; 340f7ade2a6SJeremy Kerr uint32_t conf; 341f7ade2a6SJeremy Kerr int rc, i; 342f7ade2a6SJeremy Kerr 343f7ade2a6SJeremy Kerr /* 344f7ade2a6SJeremy Kerr * scan engines 345f7ade2a6SJeremy Kerr * 346f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 347f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 348f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 349f7ade2a6SJeremy Kerr */ 350f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 351f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 352f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 353f7ade2a6SJeremy Kerr struct fsi_device *dev; 354f7ade2a6SJeremy Kerr 355f7ade2a6SJeremy Kerr rc = fsi_slave_read(slave, (i + 1) * sizeof(conf), 356f7ade2a6SJeremy Kerr &conf, sizeof(conf)); 357f7ade2a6SJeremy Kerr if (rc) { 358f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 359f7ade2a6SJeremy Kerr "error reading slave registers\n"); 360f7ade2a6SJeremy Kerr return -1; 361f7ade2a6SJeremy Kerr } 362f7ade2a6SJeremy Kerr conf = be32_to_cpu(conf); 363f7ade2a6SJeremy Kerr 364f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 365f7ade2a6SJeremy Kerr if (crc) { 366f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 367f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 368f7ade2a6SJeremy Kerr i); 369f7ade2a6SJeremy Kerr return -1; 370f7ade2a6SJeremy Kerr } 371f7ade2a6SJeremy Kerr 372f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 373f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 374f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 375f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 376f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 377f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 378f7ade2a6SJeremy Kerr 379f7ade2a6SJeremy Kerr /* 380f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 381f7ade2a6SJeremy Kerr * skips the defined address areas 382f7ade2a6SJeremy Kerr */ 383f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 384f7ade2a6SJeremy Kerr 385f7ade2a6SJeremy Kerr /* create device */ 386f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 387f7ade2a6SJeremy Kerr if (!dev) 388f7ade2a6SJeremy Kerr return -ENOMEM; 389f7ade2a6SJeremy Kerr 390f7ade2a6SJeremy Kerr dev->slave = slave; 391f7ade2a6SJeremy Kerr dev->engine_type = type; 392f7ade2a6SJeremy Kerr dev->version = version; 393f7ade2a6SJeremy Kerr dev->unit = i; 394f7ade2a6SJeremy Kerr dev->addr = engine_addr; 395f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 396f7ade2a6SJeremy Kerr 397f7ade2a6SJeremy Kerr dev_dbg(&slave->dev, 398f7ade2a6SJeremy Kerr "engine[%i]: type %x, version %x, addr %x size %x\n", 399f7ade2a6SJeremy Kerr dev->unit, dev->engine_type, version, 400f7ade2a6SJeremy Kerr dev->addr, dev->size); 401f7ade2a6SJeremy Kerr 402f7ade2a6SJeremy Kerr dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", 403f7ade2a6SJeremy Kerr slave->master->idx, slave->link, 404f7ade2a6SJeremy Kerr slave->id, i - 2); 405f7ade2a6SJeremy Kerr 406f7ade2a6SJeremy Kerr rc = device_register(&dev->dev); 407f7ade2a6SJeremy Kerr if (rc) { 408f7ade2a6SJeremy Kerr dev_warn(&slave->dev, "add failed: %d\n", rc); 409f7ade2a6SJeremy Kerr put_device(&dev->dev); 410f7ade2a6SJeremy Kerr } 411f7ade2a6SJeremy Kerr } 412f7ade2a6SJeremy Kerr 413f7ade2a6SJeremy Kerr engine_addr += slots * engine_page_size; 414f7ade2a6SJeremy Kerr 415f7ade2a6SJeremy Kerr if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) 416f7ade2a6SJeremy Kerr break; 417f7ade2a6SJeremy Kerr } 418f7ade2a6SJeremy Kerr 419f7ade2a6SJeremy Kerr return 0; 420f7ade2a6SJeremy Kerr } 421f7ade2a6SJeremy Kerr 422125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 423125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 424125739cbSJeremy Kerr loff_t off, size_t count) 425125739cbSJeremy Kerr { 426125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 427125739cbSJeremy Kerr size_t total_len, read_len; 428125739cbSJeremy Kerr int rc; 429125739cbSJeremy Kerr 430125739cbSJeremy Kerr if (off < 0) 431125739cbSJeremy Kerr return -EINVAL; 432125739cbSJeremy Kerr 433125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 434125739cbSJeremy Kerr return -EINVAL; 435125739cbSJeremy Kerr 436125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += read_len) { 437125739cbSJeremy Kerr read_len = min_t(size_t, count, 4); 438125739cbSJeremy Kerr read_len -= off & 0x3; 439125739cbSJeremy Kerr 440125739cbSJeremy Kerr rc = fsi_slave_read(slave, off, buf + total_len, read_len); 441125739cbSJeremy Kerr if (rc) 442125739cbSJeremy Kerr return rc; 443125739cbSJeremy Kerr 444125739cbSJeremy Kerr off += read_len; 445125739cbSJeremy Kerr } 446125739cbSJeremy Kerr 447125739cbSJeremy Kerr return count; 448125739cbSJeremy Kerr } 449125739cbSJeremy Kerr 450125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_write(struct file *file, 451125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 452125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 453125739cbSJeremy Kerr { 454125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 455125739cbSJeremy Kerr size_t total_len, write_len; 456125739cbSJeremy Kerr int rc; 457125739cbSJeremy Kerr 458125739cbSJeremy Kerr if (off < 0) 459125739cbSJeremy Kerr return -EINVAL; 460125739cbSJeremy Kerr 461125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 462125739cbSJeremy Kerr return -EINVAL; 463125739cbSJeremy Kerr 464125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += write_len) { 465125739cbSJeremy Kerr write_len = min_t(size_t, count, 4); 466125739cbSJeremy Kerr write_len -= off & 0x3; 467125739cbSJeremy Kerr 468125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 469125739cbSJeremy Kerr if (rc) 470125739cbSJeremy Kerr return rc; 471125739cbSJeremy Kerr 472125739cbSJeremy Kerr off += write_len; 473125739cbSJeremy Kerr } 474125739cbSJeremy Kerr 475125739cbSJeremy Kerr return count; 476125739cbSJeremy Kerr } 477125739cbSJeremy Kerr 478061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_raw_attr = { 479125739cbSJeremy Kerr .attr = { 480125739cbSJeremy Kerr .name = "raw", 481125739cbSJeremy Kerr .mode = 0600, 482125739cbSJeremy Kerr }, 483125739cbSJeremy Kerr .size = 0, 484125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 485125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 486125739cbSJeremy Kerr }; 487125739cbSJeremy Kerr 488125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_term_write(struct file *file, 489125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 490125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 491125739cbSJeremy Kerr { 492125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 493125739cbSJeremy Kerr struct fsi_master *master = slave->master; 494125739cbSJeremy Kerr 495125739cbSJeremy Kerr if (!master->term) 496125739cbSJeremy Kerr return -ENODEV; 497125739cbSJeremy Kerr 498125739cbSJeremy Kerr master->term(master, slave->link, slave->id); 499125739cbSJeremy Kerr return count; 500125739cbSJeremy Kerr } 501125739cbSJeremy Kerr 502061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_term_attr = { 503125739cbSJeremy Kerr .attr = { 504125739cbSJeremy Kerr .name = "term", 505125739cbSJeremy Kerr .mode = 0200, 506125739cbSJeremy Kerr }, 507125739cbSJeremy Kerr .size = 0, 508125739cbSJeremy Kerr .write = fsi_slave_sysfs_term_write, 509125739cbSJeremy Kerr }; 510125739cbSJeremy Kerr 5112b37c3e2SChristopher Bostic /* Encode slave local bus echo delay */ 5122b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_echodly(int x) 5132b37c3e2SChristopher Bostic { 5142b37c3e2SChristopher Bostic return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 5152b37c3e2SChristopher Bostic } 5162b37c3e2SChristopher Bostic 5172b37c3e2SChristopher Bostic /* Encode slave local bus send delay */ 5182b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_senddly(int x) 5192b37c3e2SChristopher Bostic { 5202b37c3e2SChristopher Bostic return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 5212b37c3e2SChristopher Bostic } 5222b37c3e2SChristopher Bostic 5232b37c3e2SChristopher Bostic /* Encode slave local bus clock rate ratio */ 5242b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_lbcrr(int x) 5252b37c3e2SChristopher Bostic { 5262b37c3e2SChristopher Bostic return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 5272b37c3e2SChristopher Bostic } 5282b37c3e2SChristopher Bostic 5292b37c3e2SChristopher Bostic /* Encode slave ID */ 5302b37c3e2SChristopher Bostic static inline uint32_t fsi_smode_sid(int x) 5312b37c3e2SChristopher Bostic { 5322b37c3e2SChristopher Bostic return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 5332b37c3e2SChristopher Bostic } 5342b37c3e2SChristopher Bostic 535ceb8a12fSArnd Bergmann static uint32_t fsi_slave_smode(int id) 5362b37c3e2SChristopher Bostic { 5372b37c3e2SChristopher Bostic return FSI_SMODE_WSC | FSI_SMODE_ECRC 5382b37c3e2SChristopher Bostic | fsi_smode_sid(id) 5392b37c3e2SChristopher Bostic | fsi_smode_echodly(0xf) | fsi_smode_senddly(0xf) 5402b37c3e2SChristopher Bostic | fsi_smode_lbcrr(0x8); 5412b37c3e2SChristopher Bostic } 5422b37c3e2SChristopher Bostic 5432b37c3e2SChristopher Bostic static int fsi_slave_set_smode(struct fsi_master *master, int link, int id) 5442b37c3e2SChristopher Bostic { 5452b37c3e2SChristopher Bostic uint32_t smode; 5462b37c3e2SChristopher Bostic 5472b37c3e2SChristopher Bostic /* set our smode register with the slave ID field to 0; this enables 5482b37c3e2SChristopher Bostic * extended slave addressing 5492b37c3e2SChristopher Bostic */ 5502b37c3e2SChristopher Bostic smode = fsi_slave_smode(id); 5512b37c3e2SChristopher Bostic smode = cpu_to_be32(smode); 5522b37c3e2SChristopher Bostic 5532b37c3e2SChristopher Bostic return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SMODE, 5542b37c3e2SChristopher Bostic &smode, sizeof(smode)); 5552b37c3e2SChristopher Bostic } 5562b37c3e2SChristopher Bostic 5572b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 5582b545cd8SJeremy Kerr { 5592b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 5602b545cd8SJeremy Kerr 5612b545cd8SJeremy Kerr kfree(slave); 5622b545cd8SJeremy Kerr } 5632b545cd8SJeremy Kerr 564414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 565414c1026SJeremy Kerr { 5664af889b0SJeremy Kerr uint32_t chip_id, llmode; 5672b545cd8SJeremy Kerr struct fsi_slave *slave; 5682b545cd8SJeremy Kerr uint8_t crc; 5692b545cd8SJeremy Kerr int rc; 570414c1026SJeremy Kerr 5712b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 5722b545cd8SJeremy Kerr * full 23-bit address range 5732b545cd8SJeremy Kerr */ 5742b545cd8SJeremy Kerr if (id != 0) 5752b545cd8SJeremy Kerr return -EINVAL; 5762b545cd8SJeremy Kerr 5772b545cd8SJeremy Kerr rc = fsi_master_read(master, link, id, 0, &chip_id, sizeof(chip_id)); 5782b545cd8SJeremy Kerr if (rc) { 5792b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 5802b545cd8SJeremy Kerr link, id, rc); 581414c1026SJeremy Kerr return -ENODEV; 582414c1026SJeremy Kerr } 5832b545cd8SJeremy Kerr chip_id = be32_to_cpu(chip_id); 5842b545cd8SJeremy Kerr 5852b545cd8SJeremy Kerr crc = crc4(0, chip_id, 32); 5862b545cd8SJeremy Kerr if (crc) { 5872b545cd8SJeremy Kerr dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n", 5882b545cd8SJeremy Kerr link, id); 5892b545cd8SJeremy Kerr return -EIO; 5902b545cd8SJeremy Kerr } 5912b545cd8SJeremy Kerr 5922b545cd8SJeremy Kerr dev_info(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 5932b545cd8SJeremy Kerr chip_id, master->idx, link, id); 5942b545cd8SJeremy Kerr 5952b37c3e2SChristopher Bostic rc = fsi_slave_set_smode(master, link, id); 5962b37c3e2SChristopher Bostic if (rc) { 5972b37c3e2SChristopher Bostic dev_warn(&master->dev, 5982b37c3e2SChristopher Bostic "can't set smode on slave:%02x:%02x %d\n", 5992b37c3e2SChristopher Bostic link, id, rc); 6002b37c3e2SChristopher Bostic return -ENODEV; 6012b37c3e2SChristopher Bostic } 6022b37c3e2SChristopher Bostic 6034af889b0SJeremy Kerr /* If we're behind a master that doesn't provide a self-running bus 6044af889b0SJeremy Kerr * clock, put the slave into async mode 6054af889b0SJeremy Kerr */ 6064af889b0SJeremy Kerr if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { 6074af889b0SJeremy Kerr llmode = cpu_to_be32(FSI_LLMODE_ASYNC); 6084af889b0SJeremy Kerr rc = fsi_master_write(master, link, id, 6094af889b0SJeremy Kerr FSI_SLAVE_BASE + FSI_LLMODE, 6104af889b0SJeremy Kerr &llmode, sizeof(llmode)); 6114af889b0SJeremy Kerr if (rc) 6124af889b0SJeremy Kerr dev_warn(&master->dev, 6134af889b0SJeremy Kerr "can't set llmode on slave:%02x:%02x %d\n", 6144af889b0SJeremy Kerr link, id, rc); 6154af889b0SJeremy Kerr } 6164af889b0SJeremy Kerr 6172b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 6182b545cd8SJeremy Kerr * register. 6192b545cd8SJeremy Kerr */ 6202b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 6212b545cd8SJeremy Kerr if (!slave) 6222b545cd8SJeremy Kerr return -ENOMEM; 6232b545cd8SJeremy Kerr 6242b545cd8SJeremy Kerr slave->master = master; 6252b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 6262b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 6272b545cd8SJeremy Kerr slave->link = link; 6282b545cd8SJeremy Kerr slave->id = id; 6292b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 6302b545cd8SJeremy Kerr 6312b545cd8SJeremy Kerr dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 6322b545cd8SJeremy Kerr rc = device_register(&slave->dev); 6332b545cd8SJeremy Kerr if (rc < 0) { 6342b545cd8SJeremy Kerr dev_warn(&master->dev, "failed to create slave device: %d\n", 6352b545cd8SJeremy Kerr rc); 6362b545cd8SJeremy Kerr put_device(&slave->dev); 6372b545cd8SJeremy Kerr return rc; 6382b545cd8SJeremy Kerr } 6392b545cd8SJeremy Kerr 640125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 641125739cbSJeremy Kerr if (rc) 642125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 643125739cbSJeremy Kerr 644125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_term_attr); 645125739cbSJeremy Kerr if (rc) 646125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create term attr: %d\n", rc); 647125739cbSJeremy Kerr 648f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 649f7ade2a6SJeremy Kerr if (rc) 650f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 651f7ade2a6SJeremy Kerr rc); 6522b545cd8SJeremy Kerr 6532b545cd8SJeremy Kerr return rc; 6542b545cd8SJeremy Kerr } 655414c1026SJeremy Kerr 65609aecfabSJeremy Kerr /* FSI master support */ 657014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 658014c2abcSJeremy Kerr { 659014c2abcSJeremy Kerr if (size != 1 && size != 2 && size != 4) 660014c2abcSJeremy Kerr return -EINVAL; 661014c2abcSJeremy Kerr 662014c2abcSJeremy Kerr if ((addr & 0x3) != (size & 0x3)) 663014c2abcSJeremy Kerr return -EINVAL; 664014c2abcSJeremy Kerr 665014c2abcSJeremy Kerr return 0; 666014c2abcSJeremy Kerr } 667014c2abcSJeremy Kerr 668014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 669014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 670014c2abcSJeremy Kerr { 671014c2abcSJeremy Kerr int rc; 672014c2abcSJeremy Kerr 67366433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 674014c2abcSJeremy Kerr 67566433b05SJeremy Kerr rc = fsi_check_access(addr, size); 67666433b05SJeremy Kerr if (!rc) 67766433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 67866433b05SJeremy Kerr 67966433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 68066433b05SJeremy Kerr false, val, rc); 68166433b05SJeremy Kerr 68266433b05SJeremy Kerr return rc; 683014c2abcSJeremy Kerr } 684014c2abcSJeremy Kerr 685014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 686014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 687014c2abcSJeremy Kerr { 688014c2abcSJeremy Kerr int rc; 689014c2abcSJeremy Kerr 69066433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 691014c2abcSJeremy Kerr 69266433b05SJeremy Kerr rc = fsi_check_access(addr, size); 69366433b05SJeremy Kerr if (!rc) 69466433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 69566433b05SJeremy Kerr 69666433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 69766433b05SJeremy Kerr true, val, rc); 69866433b05SJeremy Kerr 69966433b05SJeremy Kerr return rc; 700014c2abcSJeremy Kerr } 701014c2abcSJeremy Kerr 70226095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 70326095282SChristopher Bostic { 70426095282SChristopher Bostic if (master->link_enable) 70526095282SChristopher Bostic return master->link_enable(master, link); 70626095282SChristopher Bostic 70726095282SChristopher Bostic return 0; 70826095282SChristopher Bostic } 70926095282SChristopher Bostic 71026095282SChristopher Bostic /* 71126095282SChristopher Bostic * Issue a break command on this link 71226095282SChristopher Bostic */ 71326095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 71426095282SChristopher Bostic { 71566433b05SJeremy Kerr trace_fsi_master_break(master, link); 71666433b05SJeremy Kerr 71726095282SChristopher Bostic if (master->send_break) 71826095282SChristopher Bostic return master->send_break(master, link); 71926095282SChristopher Bostic 72026095282SChristopher Bostic return 0; 72126095282SChristopher Bostic } 72226095282SChristopher Bostic 723414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 724414c1026SJeremy Kerr { 72526095282SChristopher Bostic int link, rc; 726414c1026SJeremy Kerr 72726095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 72826095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 72926095282SChristopher Bostic if (rc) { 73026095282SChristopher Bostic dev_dbg(&master->dev, 73126095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 73226095282SChristopher Bostic continue; 73326095282SChristopher Bostic } 73426095282SChristopher Bostic rc = fsi_master_break(master, link); 73526095282SChristopher Bostic if (rc) { 73626095282SChristopher Bostic dev_dbg(&master->dev, 73726095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 73826095282SChristopher Bostic continue; 73926095282SChristopher Bostic } 74026095282SChristopher Bostic 741414c1026SJeremy Kerr fsi_slave_init(master, link, 0); 74226095282SChristopher Bostic } 743414c1026SJeremy Kerr 744414c1026SJeremy Kerr return 0; 745414c1026SJeremy Kerr } 746414c1026SJeremy Kerr 747cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 748cd0fdb5cSChristopher Bostic { 749cd0fdb5cSChristopher Bostic device_unregister(dev); 750cd0fdb5cSChristopher Bostic return 0; 751cd0fdb5cSChristopher Bostic } 752cd0fdb5cSChristopher Bostic 753cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 754cd0fdb5cSChristopher Bostic { 755cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 756cd0fdb5cSChristopher Bostic device_unregister(dev); 757cd0fdb5cSChristopher Bostic return 0; 758cd0fdb5cSChristopher Bostic } 759cd0fdb5cSChristopher Bostic 760cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 761cd0fdb5cSChristopher Bostic { 762cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 763cd0fdb5cSChristopher Bostic } 764cd0fdb5cSChristopher Bostic 76515362d69SJeremy Kerr int fsi_master_rescan(struct fsi_master *master) 76615362d69SJeremy Kerr { 76715362d69SJeremy Kerr fsi_master_unscan(master); 76815362d69SJeremy Kerr return fsi_master_scan(master); 76915362d69SJeremy Kerr } 77015362d69SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_rescan); 77115362d69SJeremy Kerr 772cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 773cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 774cd0fdb5cSChristopher Bostic { 775cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 776cd0fdb5cSChristopher Bostic int rc; 777cd0fdb5cSChristopher Bostic 77815362d69SJeremy Kerr rc = fsi_master_rescan(master); 779cd0fdb5cSChristopher Bostic if (rc < 0) 780cd0fdb5cSChristopher Bostic return rc; 781cd0fdb5cSChristopher Bostic 782cd0fdb5cSChristopher Bostic return count; 783cd0fdb5cSChristopher Bostic } 784cd0fdb5cSChristopher Bostic 785cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 786cd0fdb5cSChristopher Bostic 787125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 788125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 789125739cbSJeremy Kerr { 790125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 791125739cbSJeremy Kerr 792125739cbSJeremy Kerr fsi_master_break(master, 0); 793125739cbSJeremy Kerr 794125739cbSJeremy Kerr return count; 795125739cbSJeremy Kerr } 796125739cbSJeremy Kerr 797125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 798125739cbSJeremy Kerr 79909aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 80009aecfabSJeremy Kerr { 80109aecfabSJeremy Kerr int rc; 80209aecfabSJeremy Kerr 80309aecfabSJeremy Kerr if (!master) 80409aecfabSJeremy Kerr return -EINVAL; 80509aecfabSJeremy Kerr 80609aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 80709aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 80809aecfabSJeremy Kerr 80909aecfabSJeremy Kerr rc = device_register(&master->dev); 810414c1026SJeremy Kerr if (rc) { 81109aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 81209aecfabSJeremy Kerr return rc; 81309aecfabSJeremy Kerr } 814414c1026SJeremy Kerr 815cd0fdb5cSChristopher Bostic rc = device_create_file(&master->dev, &dev_attr_rescan); 816cd0fdb5cSChristopher Bostic if (rc) { 817cd0fdb5cSChristopher Bostic device_unregister(&master->dev); 818cd0fdb5cSChristopher Bostic ida_simple_remove(&master_ida, master->idx); 819cd0fdb5cSChristopher Bostic return rc; 820cd0fdb5cSChristopher Bostic } 821cd0fdb5cSChristopher Bostic 822125739cbSJeremy Kerr rc = device_create_file(&master->dev, &dev_attr_break); 823125739cbSJeremy Kerr if (rc) { 824125739cbSJeremy Kerr device_unregister(&master->dev); 825125739cbSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 826125739cbSJeremy Kerr return rc; 827125739cbSJeremy Kerr } 828125739cbSJeremy Kerr 829414c1026SJeremy Kerr fsi_master_scan(master); 830cd0fdb5cSChristopher Bostic 831414c1026SJeremy Kerr return 0; 832414c1026SJeremy Kerr } 83309aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 83409aecfabSJeremy Kerr 83509aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 83609aecfabSJeremy Kerr { 83709aecfabSJeremy Kerr if (master->idx >= 0) { 83809aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 83909aecfabSJeremy Kerr master->idx = -1; 84009aecfabSJeremy Kerr } 84109aecfabSJeremy Kerr 842cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 84309aecfabSJeremy Kerr device_unregister(&master->dev); 84409aecfabSJeremy Kerr } 84509aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 84609aecfabSJeremy Kerr 8470508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 8480508ad1fSJeremy Kerr 849dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 850dd37eed7SJeremy Kerr { 851dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 852dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 853dd37eed7SJeremy Kerr const struct fsi_device_id *id; 854dd37eed7SJeremy Kerr 855dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 856dd37eed7SJeremy Kerr return 0; 857dd37eed7SJeremy Kerr 858dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 859dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 860dd37eed7SJeremy Kerr continue; 861dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 862dd37eed7SJeremy Kerr id->version == fsi_dev->version) 863dd37eed7SJeremy Kerr return 1; 864dd37eed7SJeremy Kerr } 865dd37eed7SJeremy Kerr 866dd37eed7SJeremy Kerr return 0; 867dd37eed7SJeremy Kerr } 868dd37eed7SJeremy Kerr 869356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 870356d8009SChristopher Bostic { 871356d8009SChristopher Bostic if (!fsi_drv) 872356d8009SChristopher Bostic return -EINVAL; 873356d8009SChristopher Bostic if (!fsi_drv->id_table) 874356d8009SChristopher Bostic return -EINVAL; 875356d8009SChristopher Bostic 876356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 877356d8009SChristopher Bostic } 878356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 879356d8009SChristopher Bostic 880356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 881356d8009SChristopher Bostic { 882356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 883356d8009SChristopher Bostic } 884356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 885356d8009SChristopher Bostic 8860508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 8870508ad1fSJeremy Kerr .name = "fsi", 888dd37eed7SJeremy Kerr .match = fsi_bus_match, 8890508ad1fSJeremy Kerr }; 8900508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 8910508ad1fSJeremy Kerr 892496f8931SJoel Stanley static int __init fsi_init(void) 8930508ad1fSJeremy Kerr { 8940508ad1fSJeremy Kerr return bus_register(&fsi_bus_type); 8950508ad1fSJeremy Kerr } 896496f8931SJoel Stanley postcore_initcall(fsi_init); 8970508ad1fSJeremy Kerr 8980508ad1fSJeremy Kerr static void fsi_exit(void) 8990508ad1fSJeremy Kerr { 9000508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 9010508ad1fSJeremy Kerr } 9020508ad1fSJeremy Kerr module_exit(fsi_exit); 9031fa847d7SJeremy Kerr module_param(discard_errors, int, 0664); 904acb7e8f7SChristopher Bostic MODULE_LICENSE("GPL"); 9051fa847d7SJeremy Kerr MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); 906