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> 21f6a2f8ebSJeremy Kerr #include <linux/of.h> 222b545cd8SJeremy Kerr #include <linux/slab.h> 23f7ade2a6SJeremy Kerr #include <linux/bitops.h> 240508ad1fSJeremy Kerr 2509aecfabSJeremy Kerr #include "fsi-master.h" 2609aecfabSJeremy Kerr 2766433b05SJeremy Kerr #define CREATE_TRACE_POINTS 2866433b05SJeremy Kerr #include <trace/events/fsi.h> 2966433b05SJeremy Kerr 30f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) 31f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) 32f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 33f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) 34f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_SHIFT 12 35f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) 36f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_SHIFT 4 37f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_SHIFT 4 38f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) 39f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_DATA_BITS 28 40f7ade2a6SJeremy Kerr 414efe37f4SJeremy Kerr #define FSI_PEEK_BASE 0x410 424efe37f4SJeremy Kerr 43f7ade2a6SJeremy Kerr static const int engine_page_size = 0x400; 44f7ade2a6SJeremy Kerr 452b37c3e2SChristopher Bostic #define FSI_SLAVE_BASE 0x800 462b37c3e2SChristopher Bostic 472b37c3e2SChristopher Bostic /* 482b37c3e2SChristopher Bostic * FSI slave engine control register offsets 492b37c3e2SChristopher Bostic */ 502b37c3e2SChristopher Bostic #define FSI_SMODE 0x0 /* R/W: Mode register */ 511fa847d7SJeremy Kerr #define FSI_SISC 0x8 /* R/W: Interrupt condition */ 521fa847d7SJeremy Kerr #define FSI_SSTAT 0x14 /* R : Slave status */ 534af889b0SJeremy Kerr #define FSI_LLMODE 0x100 /* R/W: Link layer mode register */ 542b37c3e2SChristopher Bostic 552b37c3e2SChristopher Bostic /* 562b37c3e2SChristopher Bostic * SMODE fields 572b37c3e2SChristopher Bostic */ 582b37c3e2SChristopher Bostic #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ 592b37c3e2SChristopher Bostic #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ 602b37c3e2SChristopher Bostic #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ 612b37c3e2SChristopher Bostic #define FSI_SMODE_SID_MASK 3 /* ID Mask */ 622b37c3e2SChristopher Bostic #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ 632b37c3e2SChristopher Bostic #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ 642b37c3e2SChristopher Bostic #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ 652b37c3e2SChristopher Bostic #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ 662b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ 672b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ 682b37c3e2SChristopher Bostic 694af889b0SJeremy Kerr /* 704af889b0SJeremy Kerr * LLMODE fields 714af889b0SJeremy Kerr */ 724af889b0SJeremy Kerr #define FSI_LLMODE_ASYNC 0x1 734af889b0SJeremy Kerr 742b545cd8SJeremy Kerr #define FSI_SLAVE_SIZE_23b 0x800000 752b545cd8SJeremy Kerr 7609aecfabSJeremy Kerr static DEFINE_IDA(master_ida); 7709aecfabSJeremy Kerr 78faf0b116SJeremy Kerr struct fsi_slave { 79faf0b116SJeremy Kerr struct device dev; 80faf0b116SJeremy Kerr struct fsi_master *master; 81faf0b116SJeremy Kerr int id; 82faf0b116SJeremy Kerr int link; 830a213777SBenjamin Herrenschmidt int chip_id; 84faf0b116SJeremy Kerr uint32_t size; /* size of slave address space */ 85a2e7da86SBenjamin Herrenschmidt u8 t_send_delay; 86a2e7da86SBenjamin Herrenschmidt u8 t_echo_delay; 87faf0b116SJeremy Kerr }; 88faf0b116SJeremy Kerr 89cd0fdb5cSChristopher Bostic #define to_fsi_master(d) container_of(d, struct fsi_master, dev) 90faf0b116SJeremy Kerr #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) 91faf0b116SJeremy Kerr 921fa847d7SJeremy Kerr static const int slave_retries = 2; 931fa847d7SJeremy Kerr static int discard_errors; 941fa847d7SJeremy Kerr 950ab5fe53SBenjamin Herrenschmidt static dev_t fsi_base_dev; 960ab5fe53SBenjamin Herrenschmidt static DEFINE_IDA(fsi_minor_ida); 970ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_MAX_DEVICES 0x1000 980ab5fe53SBenjamin Herrenschmidt 990ab5fe53SBenjamin Herrenschmidt /* Legacy /dev numbering: 4 devices per chip, 16 chips */ 1000ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_LEGACY_TOP 64 1010ab5fe53SBenjamin Herrenschmidt 102014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 103014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 104014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 105014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 1061fa847d7SJeremy Kerr static int fsi_master_break(struct fsi_master *master, int link); 107014c2abcSJeremy Kerr 1084efe37f4SJeremy Kerr /* 1094efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 1104efe37f4SJeremy Kerr * 1114efe37f4SJeremy Kerr * FSI endpoint-device support 1124efe37f4SJeremy Kerr * 1134efe37f4SJeremy Kerr * Read / write / peek accessors for a client 1144efe37f4SJeremy Kerr * 1154efe37f4SJeremy Kerr * Parameters: 1164efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 1174efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 1184efe37f4SJeremy Kerr * plus desired offset to access its register space. 1194efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 1204efe37f4SJeremy Kerr * write this is value to write to the specified address. 1214efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 1224efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1234efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1244efe37f4SJeremy Kerr */ 1254efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1264efe37f4SJeremy Kerr size_t size) 1274efe37f4SJeremy Kerr { 1284efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1294efe37f4SJeremy Kerr return -EINVAL; 1304efe37f4SJeremy Kerr 1314efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1324efe37f4SJeremy Kerr } 1334efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1344efe37f4SJeremy Kerr 1354efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1364efe37f4SJeremy Kerr size_t size) 1374efe37f4SJeremy Kerr { 1384efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1394efe37f4SJeremy Kerr return -EINVAL; 1404efe37f4SJeremy Kerr 1414efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1424efe37f4SJeremy Kerr } 1434efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1444efe37f4SJeremy Kerr 1454efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1464efe37f4SJeremy Kerr { 1474efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1484efe37f4SJeremy Kerr 1494efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1504efe37f4SJeremy Kerr } 151f7ade2a6SJeremy Kerr 152f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 153f7ade2a6SJeremy Kerr { 154f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 155f7ade2a6SJeremy Kerr 156f6a2f8ebSJeremy Kerr of_node_put(device->dev.of_node); 157f7ade2a6SJeremy Kerr kfree(device); 158f7ade2a6SJeremy Kerr } 159f7ade2a6SJeremy Kerr 160f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 161f7ade2a6SJeremy Kerr { 162f7ade2a6SJeremy Kerr struct fsi_device *dev; 163f7ade2a6SJeremy Kerr 164f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 165f7ade2a6SJeremy Kerr if (!dev) 166f7ade2a6SJeremy Kerr return NULL; 167f7ade2a6SJeremy Kerr 168f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 169f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 170f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 171f7ade2a6SJeremy Kerr 172f7ade2a6SJeremy Kerr return dev; 173f7ade2a6SJeremy Kerr } 174f7ade2a6SJeremy Kerr 175414c1026SJeremy Kerr /* FSI slave support */ 176014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 177014c2abcSJeremy Kerr uint8_t *idp) 178014c2abcSJeremy Kerr { 179014c2abcSJeremy Kerr uint32_t addr = *addrp; 180014c2abcSJeremy Kerr uint8_t id = *idp; 181014c2abcSJeremy Kerr 182014c2abcSJeremy Kerr if (addr > slave->size) 183014c2abcSJeremy Kerr return -EINVAL; 184014c2abcSJeremy Kerr 185014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 186014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 187014c2abcSJeremy Kerr */ 188014c2abcSJeremy Kerr if (addr > 0x1fffff) { 189014c2abcSJeremy Kerr if (slave->id != 0) 190014c2abcSJeremy Kerr return -EINVAL; 191014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 192014c2abcSJeremy Kerr addr &= 0x1fffff; 193014c2abcSJeremy Kerr } 194014c2abcSJeremy Kerr 195014c2abcSJeremy Kerr *addrp = addr; 196014c2abcSJeremy Kerr *idp = id; 197014c2abcSJeremy Kerr return 0; 198014c2abcSJeremy Kerr } 199014c2abcSJeremy Kerr 200ed50a089SColin Ian King static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) 2011fa847d7SJeremy Kerr { 2021fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 20311454d6dSJoel Stanley __be32 irq, stat; 2041fa847d7SJeremy Kerr int rc, link; 2051fa847d7SJeremy Kerr uint8_t id; 2061fa847d7SJeremy Kerr 2071fa847d7SJeremy Kerr link = slave->link; 2081fa847d7SJeremy Kerr id = slave->id; 2091fa847d7SJeremy Kerr 2101fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2111fa847d7SJeremy Kerr &irq, sizeof(irq)); 2121fa847d7SJeremy Kerr if (rc) 2131fa847d7SJeremy Kerr return rc; 2141fa847d7SJeremy Kerr 2151fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, 2161fa847d7SJeremy Kerr &stat, sizeof(stat)); 2171fa847d7SJeremy Kerr if (rc) 2181fa847d7SJeremy Kerr return rc; 2191fa847d7SJeremy Kerr 220638bd9acSChristopher Bostic dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", 2211fa847d7SJeremy Kerr be32_to_cpu(stat), be32_to_cpu(irq)); 2221fa847d7SJeremy Kerr 2231fa847d7SJeremy Kerr /* clear interrupts */ 2241fa847d7SJeremy Kerr return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2251fa847d7SJeremy Kerr &irq, sizeof(irq)); 2261fa847d7SJeremy Kerr } 2271fa847d7SJeremy Kerr 228935f9636SBenjamin Herrenschmidt /* Encode slave local bus echo delay */ 229935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_echodly(int x) 230935f9636SBenjamin Herrenschmidt { 231935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 232935f9636SBenjamin Herrenschmidt } 233935f9636SBenjamin Herrenschmidt 234935f9636SBenjamin Herrenschmidt /* Encode slave local bus send delay */ 235935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_senddly(int x) 236935f9636SBenjamin Herrenschmidt { 237935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 238935f9636SBenjamin Herrenschmidt } 239935f9636SBenjamin Herrenschmidt 240935f9636SBenjamin Herrenschmidt /* Encode slave local bus clock rate ratio */ 241935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_lbcrr(int x) 242935f9636SBenjamin Herrenschmidt { 243935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 244935f9636SBenjamin Herrenschmidt } 245935f9636SBenjamin Herrenschmidt 246935f9636SBenjamin Herrenschmidt /* Encode slave ID */ 247935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_sid(int x) 248935f9636SBenjamin Herrenschmidt { 249935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 250935f9636SBenjamin Herrenschmidt } 251935f9636SBenjamin Herrenschmidt 252a2e7da86SBenjamin Herrenschmidt static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly) 253935f9636SBenjamin Herrenschmidt { 254935f9636SBenjamin Herrenschmidt return FSI_SMODE_WSC | FSI_SMODE_ECRC 255935f9636SBenjamin Herrenschmidt | fsi_smode_sid(id) 256a2e7da86SBenjamin Herrenschmidt | fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1) 257935f9636SBenjamin Herrenschmidt | fsi_smode_lbcrr(0x8); 258935f9636SBenjamin Herrenschmidt } 259935f9636SBenjamin Herrenschmidt 260a2e7da86SBenjamin Herrenschmidt static int fsi_slave_set_smode(struct fsi_slave *slave) 261935f9636SBenjamin Herrenschmidt { 262935f9636SBenjamin Herrenschmidt uint32_t smode; 263935f9636SBenjamin Herrenschmidt __be32 data; 264935f9636SBenjamin Herrenschmidt 265935f9636SBenjamin Herrenschmidt /* set our smode register with the slave ID field to 0; this enables 266935f9636SBenjamin Herrenschmidt * extended slave addressing 267935f9636SBenjamin Herrenschmidt */ 268a2e7da86SBenjamin Herrenschmidt smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay); 269935f9636SBenjamin Herrenschmidt data = cpu_to_be32(smode); 270935f9636SBenjamin Herrenschmidt 271a2e7da86SBenjamin Herrenschmidt return fsi_master_write(slave->master, slave->link, slave->id, 272a2e7da86SBenjamin Herrenschmidt FSI_SLAVE_BASE + FSI_SMODE, 273935f9636SBenjamin Herrenschmidt &data, sizeof(data)); 274935f9636SBenjamin Herrenschmidt } 2751fa847d7SJeremy Kerr 276ed50a089SColin Ian King static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, 277ed50a089SColin Ian King uint32_t addr, size_t size) 2781fa847d7SJeremy Kerr { 2791fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 2801fa847d7SJeremy Kerr int rc, link; 2811fa847d7SJeremy Kerr uint32_t reg; 282a2e7da86SBenjamin Herrenschmidt uint8_t id, send_delay, echo_delay; 2831fa847d7SJeremy Kerr 2841fa847d7SJeremy Kerr if (discard_errors) 2851fa847d7SJeremy Kerr return -1; 2861fa847d7SJeremy Kerr 2871fa847d7SJeremy Kerr link = slave->link; 2881fa847d7SJeremy Kerr id = slave->id; 2891fa847d7SJeremy Kerr 2901fa847d7SJeremy Kerr dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", 2911fa847d7SJeremy Kerr write ? "write" : "read", addr, size); 2921fa847d7SJeremy Kerr 2931fa847d7SJeremy Kerr /* try a simple clear of error conditions, which may fail if we've lost 2941fa847d7SJeremy Kerr * communication with the slave 2951fa847d7SJeremy Kerr */ 2961fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 2971fa847d7SJeremy Kerr if (!rc) 2981fa847d7SJeremy Kerr return 0; 2991fa847d7SJeremy Kerr 3001fa847d7SJeremy Kerr /* send a TERM and retry */ 3011fa847d7SJeremy Kerr if (master->term) { 3021fa847d7SJeremy Kerr rc = master->term(master, link, id); 3031fa847d7SJeremy Kerr if (!rc) { 3041fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, 0, 3051fa847d7SJeremy Kerr ®, sizeof(reg)); 3061fa847d7SJeremy Kerr if (!rc) 3071fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 3081fa847d7SJeremy Kerr if (!rc) 3091fa847d7SJeremy Kerr return 0; 3101fa847d7SJeremy Kerr } 3111fa847d7SJeremy Kerr } 3121fa847d7SJeremy Kerr 313a2e7da86SBenjamin Herrenschmidt send_delay = slave->t_send_delay; 314a2e7da86SBenjamin Herrenschmidt echo_delay = slave->t_echo_delay; 315a2e7da86SBenjamin Herrenschmidt 3161fa847d7SJeremy Kerr /* getting serious, reset the slave via BREAK */ 3171fa847d7SJeremy Kerr rc = fsi_master_break(master, link); 3181fa847d7SJeremy Kerr if (rc) 3191fa847d7SJeremy Kerr return rc; 3201fa847d7SJeremy Kerr 321a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = send_delay; 322a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = echo_delay; 323a2e7da86SBenjamin Herrenschmidt 324a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 3251fa847d7SJeremy Kerr if (rc) 3261fa847d7SJeremy Kerr return rc; 3271fa847d7SJeremy Kerr 328a2e7da86SBenjamin Herrenschmidt if (master->link_config) 329a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 330a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 331a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 332a2e7da86SBenjamin Herrenschmidt 3331fa847d7SJeremy Kerr return fsi_slave_report_and_clear_errors(slave); 3341fa847d7SJeremy Kerr } 3351fa847d7SJeremy Kerr 336da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 337014c2abcSJeremy Kerr void *val, size_t size) 338014c2abcSJeremy Kerr { 339014c2abcSJeremy Kerr uint8_t id = slave->id; 3401fa847d7SJeremy Kerr int rc, err_rc, i; 341014c2abcSJeremy Kerr 342014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 343014c2abcSJeremy Kerr if (rc) 344014c2abcSJeremy Kerr return rc; 345014c2abcSJeremy Kerr 3461fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3471fa847d7SJeremy Kerr rc = fsi_master_read(slave->master, slave->link, 3481fa847d7SJeremy Kerr id, addr, val, size); 3491fa847d7SJeremy Kerr if (!rc) 3501fa847d7SJeremy Kerr break; 3511fa847d7SJeremy Kerr 3521fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, false, addr, size); 3531fa847d7SJeremy Kerr if (err_rc) 3541fa847d7SJeremy Kerr break; 3551fa847d7SJeremy Kerr } 3561fa847d7SJeremy Kerr 3571fa847d7SJeremy Kerr return rc; 358014c2abcSJeremy Kerr } 359da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 360014c2abcSJeremy Kerr 361da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 362014c2abcSJeremy Kerr const void *val, size_t size) 363014c2abcSJeremy Kerr { 364014c2abcSJeremy Kerr uint8_t id = slave->id; 3651fa847d7SJeremy Kerr int rc, err_rc, i; 366014c2abcSJeremy Kerr 367014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 368014c2abcSJeremy Kerr if (rc) 369014c2abcSJeremy Kerr return rc; 370014c2abcSJeremy Kerr 3711fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3721fa847d7SJeremy Kerr rc = fsi_master_write(slave->master, slave->link, 3731fa847d7SJeremy Kerr id, addr, val, size); 3741fa847d7SJeremy Kerr if (!rc) 3751fa847d7SJeremy Kerr break; 3761fa847d7SJeremy Kerr 3771fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, true, addr, size); 3781fa847d7SJeremy Kerr if (err_rc) 3791fa847d7SJeremy Kerr break; 3801fa847d7SJeremy Kerr } 3811fa847d7SJeremy Kerr 3821fa847d7SJeremy Kerr return rc; 383014c2abcSJeremy Kerr } 384da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 385da36cadfSJeremy Kerr 386da36cadfSJeremy Kerr extern int fsi_slave_claim_range(struct fsi_slave *slave, 387da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 388da36cadfSJeremy Kerr { 389da36cadfSJeremy Kerr if (addr + size < addr) 390da36cadfSJeremy Kerr return -EINVAL; 391da36cadfSJeremy Kerr 392da36cadfSJeremy Kerr if (addr + size > slave->size) 393da36cadfSJeremy Kerr return -EINVAL; 394da36cadfSJeremy Kerr 395da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 396da36cadfSJeremy Kerr return 0; 397da36cadfSJeremy Kerr } 398da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 399da36cadfSJeremy Kerr 400da36cadfSJeremy Kerr extern void fsi_slave_release_range(struct fsi_slave *slave, 401da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 402da36cadfSJeremy Kerr { 403da36cadfSJeremy Kerr } 404da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 405014c2abcSJeremy Kerr 406f6a2f8ebSJeremy Kerr static bool fsi_device_node_matches(struct device *dev, struct device_node *np, 407f6a2f8ebSJeremy Kerr uint32_t addr, uint32_t size) 408f6a2f8ebSJeremy Kerr { 409f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 410f6a2f8ebSJeremy Kerr const __be32 *prop; 411f6a2f8ebSJeremy Kerr uint32_t psize; 412f6a2f8ebSJeremy Kerr 413f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 414f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 415f6a2f8ebSJeremy Kerr 416f6a2f8ebSJeremy Kerr if (na != 1 || ns != 1) 417f6a2f8ebSJeremy Kerr return false; 418f6a2f8ebSJeremy Kerr 419f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 420f6a2f8ebSJeremy Kerr if (!prop || len != 8) 421f6a2f8ebSJeremy Kerr return false; 422f6a2f8ebSJeremy Kerr 423f6a2f8ebSJeremy Kerr if (of_read_number(prop, 1) != addr) 424f6a2f8ebSJeremy Kerr return false; 425f6a2f8ebSJeremy Kerr 426f6a2f8ebSJeremy Kerr psize = of_read_number(prop + 1, 1); 427f6a2f8ebSJeremy Kerr if (psize != size) { 428f6a2f8ebSJeremy Kerr dev_warn(dev, 429f6a2f8ebSJeremy Kerr "node %s matches probed address, but not size (got 0x%x, expected 0x%x)", 430f6a2f8ebSJeremy Kerr of_node_full_name(np), psize, size); 431f6a2f8ebSJeremy Kerr } 432f6a2f8ebSJeremy Kerr 433f6a2f8ebSJeremy Kerr return true; 434f6a2f8ebSJeremy Kerr } 435f6a2f8ebSJeremy Kerr 436f6a2f8ebSJeremy Kerr /* Find a matching node for the slave engine at @address, using @size bytes 437f6a2f8ebSJeremy Kerr * of space. Returns NULL if not found, or a matching node with refcount 438f6a2f8ebSJeremy Kerr * already incremented. 439f6a2f8ebSJeremy Kerr */ 440f6a2f8ebSJeremy Kerr static struct device_node *fsi_device_find_of_node(struct fsi_device *dev) 441f6a2f8ebSJeremy Kerr { 442f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 443f6a2f8ebSJeremy Kerr 444f6a2f8ebSJeremy Kerr parent = dev_of_node(&dev->slave->dev); 445f6a2f8ebSJeremy Kerr if (!parent) 446f6a2f8ebSJeremy Kerr return NULL; 447f6a2f8ebSJeremy Kerr 448f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 449f6a2f8ebSJeremy Kerr if (fsi_device_node_matches(&dev->dev, np, 450f6a2f8ebSJeremy Kerr dev->addr, dev->size)) 451f6a2f8ebSJeremy Kerr return np; 452f6a2f8ebSJeremy Kerr } 453f6a2f8ebSJeremy Kerr 454f6a2f8ebSJeremy Kerr return NULL; 455f6a2f8ebSJeremy Kerr } 456f6a2f8ebSJeremy Kerr 457f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 458f7ade2a6SJeremy Kerr { 459f7ade2a6SJeremy Kerr uint32_t engine_addr; 460f7ade2a6SJeremy Kerr int rc, i; 461f7ade2a6SJeremy Kerr 462f7ade2a6SJeremy Kerr /* 463f7ade2a6SJeremy Kerr * scan engines 464f7ade2a6SJeremy Kerr * 465f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 466f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 467f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 468f7ade2a6SJeremy Kerr */ 469f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 470f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 471f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 472f7ade2a6SJeremy Kerr struct fsi_device *dev; 47311454d6dSJoel Stanley uint32_t conf; 47411454d6dSJoel Stanley __be32 data; 475f7ade2a6SJeremy Kerr 47611454d6dSJoel Stanley rc = fsi_slave_read(slave, (i + 1) * sizeof(data), 47711454d6dSJoel Stanley &data, sizeof(data)); 478f7ade2a6SJeremy Kerr if (rc) { 479f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 480f7ade2a6SJeremy Kerr "error reading slave registers\n"); 481f7ade2a6SJeremy Kerr return -1; 482f7ade2a6SJeremy Kerr } 48311454d6dSJoel Stanley conf = be32_to_cpu(data); 484f7ade2a6SJeremy Kerr 485f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 486f7ade2a6SJeremy Kerr if (crc) { 487f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 488f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 489f7ade2a6SJeremy Kerr i); 490f7ade2a6SJeremy Kerr return -1; 491f7ade2a6SJeremy Kerr } 492f7ade2a6SJeremy Kerr 493f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 494f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 495f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 496f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 497f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 498f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 499f7ade2a6SJeremy Kerr 500f7ade2a6SJeremy Kerr /* 501f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 502f7ade2a6SJeremy Kerr * skips the defined address areas 503f7ade2a6SJeremy Kerr */ 504f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 505f7ade2a6SJeremy Kerr 506f7ade2a6SJeremy Kerr /* create device */ 507f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 508f7ade2a6SJeremy Kerr if (!dev) 509f7ade2a6SJeremy Kerr return -ENOMEM; 510f7ade2a6SJeremy Kerr 511f7ade2a6SJeremy Kerr dev->slave = slave; 512f7ade2a6SJeremy Kerr dev->engine_type = type; 513f7ade2a6SJeremy Kerr dev->version = version; 514f7ade2a6SJeremy Kerr dev->unit = i; 515f7ade2a6SJeremy Kerr dev->addr = engine_addr; 516f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 517f7ade2a6SJeremy Kerr 518f7ade2a6SJeremy Kerr dev_dbg(&slave->dev, 519f7ade2a6SJeremy Kerr "engine[%i]: type %x, version %x, addr %x size %x\n", 520f7ade2a6SJeremy Kerr dev->unit, dev->engine_type, version, 521f7ade2a6SJeremy Kerr dev->addr, dev->size); 522f7ade2a6SJeremy Kerr 523f7ade2a6SJeremy Kerr dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", 524f7ade2a6SJeremy Kerr slave->master->idx, slave->link, 525f7ade2a6SJeremy Kerr slave->id, i - 2); 526f6a2f8ebSJeremy Kerr dev->dev.of_node = fsi_device_find_of_node(dev); 527f7ade2a6SJeremy Kerr 528f7ade2a6SJeremy Kerr rc = device_register(&dev->dev); 529f7ade2a6SJeremy Kerr if (rc) { 530f7ade2a6SJeremy Kerr dev_warn(&slave->dev, "add failed: %d\n", rc); 531f7ade2a6SJeremy Kerr put_device(&dev->dev); 532f7ade2a6SJeremy Kerr } 533f7ade2a6SJeremy Kerr } 534f7ade2a6SJeremy Kerr 535f7ade2a6SJeremy Kerr engine_addr += slots * engine_page_size; 536f7ade2a6SJeremy Kerr 537f7ade2a6SJeremy Kerr if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) 538f7ade2a6SJeremy Kerr break; 539f7ade2a6SJeremy Kerr } 540f7ade2a6SJeremy Kerr 541f7ade2a6SJeremy Kerr return 0; 542f7ade2a6SJeremy Kerr } 543f7ade2a6SJeremy Kerr 544125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 545125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 546125739cbSJeremy Kerr loff_t off, size_t count) 547125739cbSJeremy Kerr { 548125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 549125739cbSJeremy Kerr size_t total_len, read_len; 550125739cbSJeremy Kerr int rc; 551125739cbSJeremy Kerr 552125739cbSJeremy Kerr if (off < 0) 553125739cbSJeremy Kerr return -EINVAL; 554125739cbSJeremy Kerr 555125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 556125739cbSJeremy Kerr return -EINVAL; 557125739cbSJeremy Kerr 558125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += read_len) { 559125739cbSJeremy Kerr read_len = min_t(size_t, count, 4); 560125739cbSJeremy Kerr read_len -= off & 0x3; 561125739cbSJeremy Kerr 562125739cbSJeremy Kerr rc = fsi_slave_read(slave, off, buf + total_len, read_len); 563125739cbSJeremy Kerr if (rc) 564125739cbSJeremy Kerr return rc; 565125739cbSJeremy Kerr 566125739cbSJeremy Kerr off += read_len; 567125739cbSJeremy Kerr } 568125739cbSJeremy Kerr 569125739cbSJeremy Kerr return count; 570125739cbSJeremy Kerr } 571125739cbSJeremy Kerr 572125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_write(struct file *file, 573125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 574125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 575125739cbSJeremy Kerr { 576125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 577125739cbSJeremy Kerr size_t total_len, write_len; 578125739cbSJeremy Kerr int rc; 579125739cbSJeremy Kerr 580125739cbSJeremy Kerr if (off < 0) 581125739cbSJeremy Kerr return -EINVAL; 582125739cbSJeremy Kerr 583125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 584125739cbSJeremy Kerr return -EINVAL; 585125739cbSJeremy Kerr 586125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += write_len) { 587125739cbSJeremy Kerr write_len = min_t(size_t, count, 4); 588125739cbSJeremy Kerr write_len -= off & 0x3; 589125739cbSJeremy Kerr 590125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 591125739cbSJeremy Kerr if (rc) 592125739cbSJeremy Kerr return rc; 593125739cbSJeremy Kerr 594125739cbSJeremy Kerr off += write_len; 595125739cbSJeremy Kerr } 596125739cbSJeremy Kerr 597125739cbSJeremy Kerr return count; 598125739cbSJeremy Kerr } 599125739cbSJeremy Kerr 600061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_raw_attr = { 601125739cbSJeremy Kerr .attr = { 602125739cbSJeremy Kerr .name = "raw", 603125739cbSJeremy Kerr .mode = 0600, 604125739cbSJeremy Kerr }, 605125739cbSJeremy Kerr .size = 0, 606125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 607125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 608125739cbSJeremy Kerr }; 609125739cbSJeremy Kerr 610125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_term_write(struct file *file, 611125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 612125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 613125739cbSJeremy Kerr { 614125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 615125739cbSJeremy Kerr struct fsi_master *master = slave->master; 616125739cbSJeremy Kerr 617125739cbSJeremy Kerr if (!master->term) 618125739cbSJeremy Kerr return -ENODEV; 619125739cbSJeremy Kerr 620125739cbSJeremy Kerr master->term(master, slave->link, slave->id); 621125739cbSJeremy Kerr return count; 622125739cbSJeremy Kerr } 623125739cbSJeremy Kerr 624061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_term_attr = { 625125739cbSJeremy Kerr .attr = { 626125739cbSJeremy Kerr .name = "term", 627125739cbSJeremy Kerr .mode = 0200, 628125739cbSJeremy Kerr }, 629125739cbSJeremy Kerr .size = 0, 630125739cbSJeremy Kerr .write = fsi_slave_sysfs_term_write, 631125739cbSJeremy Kerr }; 632125739cbSJeremy Kerr 6332b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 6342b545cd8SJeremy Kerr { 6352b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 6362b545cd8SJeremy Kerr 6370ab5fe53SBenjamin Herrenschmidt fsi_free_minor(slave->dev.devt); 638f6a2f8ebSJeremy Kerr of_node_put(dev->of_node); 6392b545cd8SJeremy Kerr kfree(slave); 6402b545cd8SJeremy Kerr } 6412b545cd8SJeremy Kerr 642f6a2f8ebSJeremy Kerr static bool fsi_slave_node_matches(struct device_node *np, 643f6a2f8ebSJeremy Kerr int link, uint8_t id) 644f6a2f8ebSJeremy Kerr { 645f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 646f6a2f8ebSJeremy Kerr const __be32 *prop; 647f6a2f8ebSJeremy Kerr 648f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 649f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 650f6a2f8ebSJeremy Kerr 651f6a2f8ebSJeremy Kerr /* Ensure we have the correct format for addresses and sizes in 652f6a2f8ebSJeremy Kerr * reg properties 653f6a2f8ebSJeremy Kerr */ 654f6a2f8ebSJeremy Kerr if (na != 2 || ns != 0) 655f6a2f8ebSJeremy Kerr return false; 656f6a2f8ebSJeremy Kerr 657f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 658f6a2f8ebSJeremy Kerr if (!prop || len != 8) 659f6a2f8ebSJeremy Kerr return false; 660f6a2f8ebSJeremy Kerr 661f6a2f8ebSJeremy Kerr return (of_read_number(prop, 1) == link) && 662f6a2f8ebSJeremy Kerr (of_read_number(prop + 1, 1) == id); 663f6a2f8ebSJeremy Kerr } 664f6a2f8ebSJeremy Kerr 665f6a2f8ebSJeremy Kerr /* Find a matching node for the slave at (link, id). Returns NULL if none 666f6a2f8ebSJeremy Kerr * found, or a matching node with refcount already incremented. 667f6a2f8ebSJeremy Kerr */ 668f6a2f8ebSJeremy Kerr static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, 669f6a2f8ebSJeremy Kerr int link, uint8_t id) 670f6a2f8ebSJeremy Kerr { 671f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 672f6a2f8ebSJeremy Kerr 673f6a2f8ebSJeremy Kerr parent = dev_of_node(&master->dev); 674f6a2f8ebSJeremy Kerr if (!parent) 675f6a2f8ebSJeremy Kerr return NULL; 676f6a2f8ebSJeremy Kerr 677f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 678f6a2f8ebSJeremy Kerr if (fsi_slave_node_matches(np, link, id)) 679f6a2f8ebSJeremy Kerr return np; 680f6a2f8ebSJeremy Kerr } 681f6a2f8ebSJeremy Kerr 682f6a2f8ebSJeremy Kerr return NULL; 683f6a2f8ebSJeremy Kerr } 684f6a2f8ebSJeremy Kerr 685a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_show(struct device *dev, 686a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, 687a2e7da86SBenjamin Herrenschmidt char *buf) 688a2e7da86SBenjamin Herrenschmidt { 689a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 690a2e7da86SBenjamin Herrenschmidt 691a2e7da86SBenjamin Herrenschmidt return sprintf(buf, "%u\n", slave->t_send_delay); 692a2e7da86SBenjamin Herrenschmidt } 693a2e7da86SBenjamin Herrenschmidt 694a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_store(struct device *dev, 695a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, const char *buf, size_t count) 696a2e7da86SBenjamin Herrenschmidt { 697a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 698a2e7da86SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 699a2e7da86SBenjamin Herrenschmidt unsigned long val; 700a2e7da86SBenjamin Herrenschmidt int rc; 701a2e7da86SBenjamin Herrenschmidt 702a2e7da86SBenjamin Herrenschmidt if (kstrtoul(buf, 0, &val) < 0) 703a2e7da86SBenjamin Herrenschmidt return -EINVAL; 704a2e7da86SBenjamin Herrenschmidt 705a2e7da86SBenjamin Herrenschmidt if (val < 1 || val > 16) 706a2e7da86SBenjamin Herrenschmidt return -EINVAL; 707a2e7da86SBenjamin Herrenschmidt 708a2e7da86SBenjamin Herrenschmidt if (!master->link_config) 709a2e7da86SBenjamin Herrenschmidt return -ENXIO; 710a2e7da86SBenjamin Herrenschmidt 711a2e7da86SBenjamin Herrenschmidt /* Current HW mandates that send and echo delay are identical */ 712a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = val; 713a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = val; 714a2e7da86SBenjamin Herrenschmidt 715a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 716a2e7da86SBenjamin Herrenschmidt if (rc < 0) 717a2e7da86SBenjamin Herrenschmidt return rc; 718a2e7da86SBenjamin Herrenschmidt if (master->link_config) 719a2e7da86SBenjamin Herrenschmidt master->link_config(master, slave->link, 720a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 721a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 722a2e7da86SBenjamin Herrenschmidt 723a2e7da86SBenjamin Herrenschmidt return count; 724a2e7da86SBenjamin Herrenschmidt } 725a2e7da86SBenjamin Herrenschmidt 726a2e7da86SBenjamin Herrenschmidt static DEVICE_ATTR(send_echo_delays, 0600, 727a2e7da86SBenjamin Herrenschmidt slave_send_echo_show, slave_send_echo_store); 728a2e7da86SBenjamin Herrenschmidt 7290a213777SBenjamin Herrenschmidt static ssize_t chip_id_show(struct device *dev, 7300a213777SBenjamin Herrenschmidt struct device_attribute *attr, 7310a213777SBenjamin Herrenschmidt char *buf) 7320a213777SBenjamin Herrenschmidt { 7330a213777SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 7340a213777SBenjamin Herrenschmidt 7350a213777SBenjamin Herrenschmidt return sprintf(buf, "%d\n", slave->chip_id); 7360a213777SBenjamin Herrenschmidt } 7370a213777SBenjamin Herrenschmidt 7380a213777SBenjamin Herrenschmidt static DEVICE_ATTR_RO(chip_id); 7390a213777SBenjamin Herrenschmidt 7400ab5fe53SBenjamin Herrenschmidt static char *fsi_cdev_devnode(struct device *dev, umode_t *mode, 7410ab5fe53SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 7420ab5fe53SBenjamin Herrenschmidt { 7430ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 7440ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev)); 7450ab5fe53SBenjamin Herrenschmidt #else 7460ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 7470ab5fe53SBenjamin Herrenschmidt #endif 7480ab5fe53SBenjamin Herrenschmidt } 7490ab5fe53SBenjamin Herrenschmidt 7500ab5fe53SBenjamin Herrenschmidt const struct device_type fsi_cdev_type = { 7510ab5fe53SBenjamin Herrenschmidt .name = "fsi-cdev", 7520ab5fe53SBenjamin Herrenschmidt .devnode = fsi_cdev_devnode, 7530ab5fe53SBenjamin Herrenschmidt }; 7540ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_cdev_type); 7550ab5fe53SBenjamin Herrenschmidt 7560ab5fe53SBenjamin Herrenschmidt /* Backward compatible /dev/ numbering in "old style" mode */ 7570ab5fe53SBenjamin Herrenschmidt static int fsi_adjust_index(int index) 7580ab5fe53SBenjamin Herrenschmidt { 7590ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 7600ab5fe53SBenjamin Herrenschmidt return index; 7610ab5fe53SBenjamin Herrenschmidt #else 7620ab5fe53SBenjamin Herrenschmidt return index + 1; 7630ab5fe53SBenjamin Herrenschmidt #endif 7640ab5fe53SBenjamin Herrenschmidt } 7650ab5fe53SBenjamin Herrenschmidt 7660ab5fe53SBenjamin Herrenschmidt static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type, 7670ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 7680ab5fe53SBenjamin Herrenschmidt { 7690ab5fe53SBenjamin Herrenschmidt int cid = slave->chip_id; 7700ab5fe53SBenjamin Herrenschmidt int id; 7710ab5fe53SBenjamin Herrenschmidt 7720ab5fe53SBenjamin Herrenschmidt /* Check if we qualify for legacy numbering */ 7730ab5fe53SBenjamin Herrenschmidt if (cid >= 0 && cid < 16 && type < 4) { 7740ab5fe53SBenjamin Herrenschmidt /* Try reserving the legacy number */ 7750ab5fe53SBenjamin Herrenschmidt id = (cid << 4) | type; 7760ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); 7770ab5fe53SBenjamin Herrenschmidt if (id >= 0) { 7780ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(cid); 7790ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 7800ab5fe53SBenjamin Herrenschmidt return 0; 7810ab5fe53SBenjamin Herrenschmidt } 7820ab5fe53SBenjamin Herrenschmidt /* Other failure */ 7830ab5fe53SBenjamin Herrenschmidt if (id != -ENOSPC) 7840ab5fe53SBenjamin Herrenschmidt return id; 7850ab5fe53SBenjamin Herrenschmidt /* Fallback to non-legacy allocation */ 7860ab5fe53SBenjamin Herrenschmidt } 7870ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP, 7880ab5fe53SBenjamin Herrenschmidt FSI_CHAR_MAX_DEVICES, GFP_KERNEL); 7890ab5fe53SBenjamin Herrenschmidt if (id < 0) 7900ab5fe53SBenjamin Herrenschmidt return id; 7910ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(id); 7920ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 7930ab5fe53SBenjamin Herrenschmidt return 0; 7940ab5fe53SBenjamin Herrenschmidt } 7950ab5fe53SBenjamin Herrenschmidt 7960ab5fe53SBenjamin Herrenschmidt int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type, 7970ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 7980ab5fe53SBenjamin Herrenschmidt { 7990ab5fe53SBenjamin Herrenschmidt return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index); 8000ab5fe53SBenjamin Herrenschmidt } 8010ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_get_new_minor); 8020ab5fe53SBenjamin Herrenschmidt 8030ab5fe53SBenjamin Herrenschmidt void fsi_free_minor(dev_t dev) 8040ab5fe53SBenjamin Herrenschmidt { 8050ab5fe53SBenjamin Herrenschmidt ida_simple_remove(&fsi_minor_ida, MINOR(dev)); 8060ab5fe53SBenjamin Herrenschmidt } 8070ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_free_minor); 8080ab5fe53SBenjamin Herrenschmidt 809414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 810414c1026SJeremy Kerr { 81111454d6dSJoel Stanley uint32_t chip_id; 8122b545cd8SJeremy Kerr struct fsi_slave *slave; 8132b545cd8SJeremy Kerr uint8_t crc; 81411454d6dSJoel Stanley __be32 data, llmode; 8152b545cd8SJeremy Kerr int rc; 816414c1026SJeremy Kerr 8172b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 8182b545cd8SJeremy Kerr * full 23-bit address range 8192b545cd8SJeremy Kerr */ 8202b545cd8SJeremy Kerr if (id != 0) 8212b545cd8SJeremy Kerr return -EINVAL; 8222b545cd8SJeremy Kerr 82311454d6dSJoel Stanley rc = fsi_master_read(master, link, id, 0, &data, sizeof(data)); 8242b545cd8SJeremy Kerr if (rc) { 8252b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 8262b545cd8SJeremy Kerr link, id, rc); 827414c1026SJeremy Kerr return -ENODEV; 828414c1026SJeremy Kerr } 82911454d6dSJoel Stanley chip_id = be32_to_cpu(data); 8302b545cd8SJeremy Kerr 8312b545cd8SJeremy Kerr crc = crc4(0, chip_id, 32); 8322b545cd8SJeremy Kerr if (crc) { 8332b545cd8SJeremy Kerr dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n", 8342b545cd8SJeremy Kerr link, id); 8352b545cd8SJeremy Kerr return -EIO; 8362b545cd8SJeremy Kerr } 8372b545cd8SJeremy Kerr 838638bd9acSChristopher Bostic dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 8392b545cd8SJeremy Kerr chip_id, master->idx, link, id); 8402b545cd8SJeremy Kerr 8414af889b0SJeremy Kerr /* If we're behind a master that doesn't provide a self-running bus 8424af889b0SJeremy Kerr * clock, put the slave into async mode 8434af889b0SJeremy Kerr */ 8444af889b0SJeremy Kerr if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { 8454af889b0SJeremy Kerr llmode = cpu_to_be32(FSI_LLMODE_ASYNC); 8464af889b0SJeremy Kerr rc = fsi_master_write(master, link, id, 8474af889b0SJeremy Kerr FSI_SLAVE_BASE + FSI_LLMODE, 8484af889b0SJeremy Kerr &llmode, sizeof(llmode)); 8494af889b0SJeremy Kerr if (rc) 8504af889b0SJeremy Kerr dev_warn(&master->dev, 8514af889b0SJeremy Kerr "can't set llmode on slave:%02x:%02x %d\n", 8524af889b0SJeremy Kerr link, id, rc); 8534af889b0SJeremy Kerr } 8544af889b0SJeremy Kerr 8552b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 8562b545cd8SJeremy Kerr * register. 8572b545cd8SJeremy Kerr */ 8582b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 8592b545cd8SJeremy Kerr if (!slave) 8602b545cd8SJeremy Kerr return -ENOMEM; 8612b545cd8SJeremy Kerr 8622b545cd8SJeremy Kerr slave->master = master; 8632b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 864f6a2f8ebSJeremy Kerr slave->dev.of_node = fsi_slave_find_of_node(master, link, id); 8652b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 8662b545cd8SJeremy Kerr slave->link = link; 8672b545cd8SJeremy Kerr slave->id = id; 8682b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 869a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = 16; 870a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = 16; 871a2e7da86SBenjamin Herrenschmidt 8720a213777SBenjamin Herrenschmidt /* Get chip ID if any */ 8730a213777SBenjamin Herrenschmidt slave->chip_id = -1; 8740a213777SBenjamin Herrenschmidt if (slave->dev.of_node) { 8750a213777SBenjamin Herrenschmidt uint32_t prop; 8760a213777SBenjamin Herrenschmidt if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop)) 8770a213777SBenjamin Herrenschmidt slave->chip_id = prop; 8780a213777SBenjamin Herrenschmidt 8790a213777SBenjamin Herrenschmidt } 880a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 881a2e7da86SBenjamin Herrenschmidt if (rc) { 882a2e7da86SBenjamin Herrenschmidt dev_warn(&master->dev, 883a2e7da86SBenjamin Herrenschmidt "can't set smode on slave:%02x:%02x %d\n", 884a2e7da86SBenjamin Herrenschmidt link, id, rc); 885a2e7da86SBenjamin Herrenschmidt kfree(slave); 886a2e7da86SBenjamin Herrenschmidt return -ENODEV; 887a2e7da86SBenjamin Herrenschmidt } 888a2e7da86SBenjamin Herrenschmidt if (master->link_config) 889a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 890a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 891a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 8922b545cd8SJeremy Kerr 8932b545cd8SJeremy Kerr dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 8942b545cd8SJeremy Kerr rc = device_register(&slave->dev); 8952b545cd8SJeremy Kerr if (rc < 0) { 8962b545cd8SJeremy Kerr dev_warn(&master->dev, "failed to create slave device: %d\n", 8972b545cd8SJeremy Kerr rc); 8982b545cd8SJeremy Kerr put_device(&slave->dev); 8992b545cd8SJeremy Kerr return rc; 9002b545cd8SJeremy Kerr } 9012b545cd8SJeremy Kerr 902125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 903125739cbSJeremy Kerr if (rc) 904125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 905125739cbSJeremy Kerr 906125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_term_attr); 907125739cbSJeremy Kerr if (rc) 908125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create term attr: %d\n", rc); 909125739cbSJeremy Kerr 910a2e7da86SBenjamin Herrenschmidt rc = device_create_file(&slave->dev, &dev_attr_send_echo_delays); 911a2e7da86SBenjamin Herrenschmidt if (rc) 912a2e7da86SBenjamin Herrenschmidt dev_warn(&slave->dev, "failed to create delay attr: %d\n", rc); 913a2e7da86SBenjamin Herrenschmidt 9140a213777SBenjamin Herrenschmidt rc = device_create_file(&slave->dev, &dev_attr_chip_id); 9150a213777SBenjamin Herrenschmidt if (rc) 9160a213777SBenjamin Herrenschmidt dev_warn(&slave->dev, "failed to create chip id: %d\n", rc); 9170a213777SBenjamin Herrenschmidt 918f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 919f7ade2a6SJeremy Kerr if (rc) 920f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 921f7ade2a6SJeremy Kerr rc); 9222b545cd8SJeremy Kerr 9232b545cd8SJeremy Kerr return rc; 9242b545cd8SJeremy Kerr } 925414c1026SJeremy Kerr 92609aecfabSJeremy Kerr /* FSI master support */ 927014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 928014c2abcSJeremy Kerr { 92999f039e9SEddie James if (size == 4) { 93099f039e9SEddie James if (addr & 0x3) 931014c2abcSJeremy Kerr return -EINVAL; 93299f039e9SEddie James } else if (size == 2) { 93399f039e9SEddie James if (addr & 0x1) 93499f039e9SEddie James return -EINVAL; 93599f039e9SEddie James } else if (size != 1) 936014c2abcSJeremy Kerr return -EINVAL; 937014c2abcSJeremy Kerr 938014c2abcSJeremy Kerr return 0; 939014c2abcSJeremy Kerr } 940014c2abcSJeremy Kerr 941014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 942014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 943014c2abcSJeremy Kerr { 944014c2abcSJeremy Kerr int rc; 945014c2abcSJeremy Kerr 94666433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 947014c2abcSJeremy Kerr 94866433b05SJeremy Kerr rc = fsi_check_access(addr, size); 94966433b05SJeremy Kerr if (!rc) 95066433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 95166433b05SJeremy Kerr 95266433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 95366433b05SJeremy Kerr false, val, rc); 95466433b05SJeremy Kerr 95566433b05SJeremy Kerr return rc; 956014c2abcSJeremy Kerr } 957014c2abcSJeremy Kerr 958014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 959014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 960014c2abcSJeremy Kerr { 961014c2abcSJeremy Kerr int rc; 962014c2abcSJeremy Kerr 96366433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 964014c2abcSJeremy Kerr 96566433b05SJeremy Kerr rc = fsi_check_access(addr, size); 96666433b05SJeremy Kerr if (!rc) 96766433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 96866433b05SJeremy Kerr 96966433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 97066433b05SJeremy Kerr true, val, rc); 97166433b05SJeremy Kerr 97266433b05SJeremy Kerr return rc; 973014c2abcSJeremy Kerr } 974014c2abcSJeremy Kerr 97526095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 97626095282SChristopher Bostic { 97726095282SChristopher Bostic if (master->link_enable) 97826095282SChristopher Bostic return master->link_enable(master, link); 97926095282SChristopher Bostic 98026095282SChristopher Bostic return 0; 98126095282SChristopher Bostic } 98226095282SChristopher Bostic 98326095282SChristopher Bostic /* 98426095282SChristopher Bostic * Issue a break command on this link 98526095282SChristopher Bostic */ 98626095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 98726095282SChristopher Bostic { 988a2e7da86SBenjamin Herrenschmidt int rc = 0; 989a2e7da86SBenjamin Herrenschmidt 99066433b05SJeremy Kerr trace_fsi_master_break(master, link); 99166433b05SJeremy Kerr 99226095282SChristopher Bostic if (master->send_break) 993a2e7da86SBenjamin Herrenschmidt rc = master->send_break(master, link); 994a2e7da86SBenjamin Herrenschmidt if (master->link_config) 995a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 16, 16); 99626095282SChristopher Bostic 997a2e7da86SBenjamin Herrenschmidt return rc; 99826095282SChristopher Bostic } 99926095282SChristopher Bostic 1000414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 1001414c1026SJeremy Kerr { 100226095282SChristopher Bostic int link, rc; 1003414c1026SJeremy Kerr 100426095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 100526095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 100626095282SChristopher Bostic if (rc) { 100726095282SChristopher Bostic dev_dbg(&master->dev, 100826095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 100926095282SChristopher Bostic continue; 101026095282SChristopher Bostic } 101126095282SChristopher Bostic rc = fsi_master_break(master, link); 101226095282SChristopher Bostic if (rc) { 101326095282SChristopher Bostic dev_dbg(&master->dev, 101426095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 101526095282SChristopher Bostic continue; 101626095282SChristopher Bostic } 101726095282SChristopher Bostic 1018414c1026SJeremy Kerr fsi_slave_init(master, link, 0); 101926095282SChristopher Bostic } 1020414c1026SJeremy Kerr 1021414c1026SJeremy Kerr return 0; 1022414c1026SJeremy Kerr } 1023414c1026SJeremy Kerr 1024cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 1025cd0fdb5cSChristopher Bostic { 1026cd0fdb5cSChristopher Bostic device_unregister(dev); 1027cd0fdb5cSChristopher Bostic return 0; 1028cd0fdb5cSChristopher Bostic } 1029cd0fdb5cSChristopher Bostic 1030cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 1031cd0fdb5cSChristopher Bostic { 1032cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 10330ab5fe53SBenjamin Herrenschmidt put_device(dev); 1034cd0fdb5cSChristopher Bostic return 0; 1035cd0fdb5cSChristopher Bostic } 1036cd0fdb5cSChristopher Bostic 1037cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 1038cd0fdb5cSChristopher Bostic { 1039cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 1040cd0fdb5cSChristopher Bostic } 1041cd0fdb5cSChristopher Bostic 104215362d69SJeremy Kerr int fsi_master_rescan(struct fsi_master *master) 104315362d69SJeremy Kerr { 104415362d69SJeremy Kerr fsi_master_unscan(master); 104515362d69SJeremy Kerr return fsi_master_scan(master); 104615362d69SJeremy Kerr } 104715362d69SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_rescan); 104815362d69SJeremy Kerr 1049cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 1050cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 1051cd0fdb5cSChristopher Bostic { 1052cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 1053cd0fdb5cSChristopher Bostic int rc; 1054cd0fdb5cSChristopher Bostic 105515362d69SJeremy Kerr rc = fsi_master_rescan(master); 1056cd0fdb5cSChristopher Bostic if (rc < 0) 1057cd0fdb5cSChristopher Bostic return rc; 1058cd0fdb5cSChristopher Bostic 1059cd0fdb5cSChristopher Bostic return count; 1060cd0fdb5cSChristopher Bostic } 1061cd0fdb5cSChristopher Bostic 1062cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 1063cd0fdb5cSChristopher Bostic 1064125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 1065125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 1066125739cbSJeremy Kerr { 1067125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 1068125739cbSJeremy Kerr 1069125739cbSJeremy Kerr fsi_master_break(master, 0); 1070125739cbSJeremy Kerr 1071125739cbSJeremy Kerr return count; 1072125739cbSJeremy Kerr } 1073125739cbSJeremy Kerr 1074125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 1075125739cbSJeremy Kerr 107609aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 107709aecfabSJeremy Kerr { 107809aecfabSJeremy Kerr int rc; 1079f3aa2c6fSChristopher Bostic struct device_node *np; 108009aecfabSJeremy Kerr 108109aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 108209aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 108309aecfabSJeremy Kerr 108409aecfabSJeremy Kerr rc = device_register(&master->dev); 1085414c1026SJeremy Kerr if (rc) { 108609aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 108709aecfabSJeremy Kerr return rc; 108809aecfabSJeremy Kerr } 1089414c1026SJeremy Kerr 1090cd0fdb5cSChristopher Bostic rc = device_create_file(&master->dev, &dev_attr_rescan); 1091cd0fdb5cSChristopher Bostic if (rc) { 1092265aac26SBenjamin Herrenschmidt device_del(&master->dev); 1093cd0fdb5cSChristopher Bostic ida_simple_remove(&master_ida, master->idx); 1094cd0fdb5cSChristopher Bostic return rc; 1095cd0fdb5cSChristopher Bostic } 1096cd0fdb5cSChristopher Bostic 1097125739cbSJeremy Kerr rc = device_create_file(&master->dev, &dev_attr_break); 1098125739cbSJeremy Kerr if (rc) { 1099265aac26SBenjamin Herrenschmidt device_del(&master->dev); 1100125739cbSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 1101125739cbSJeremy Kerr return rc; 1102125739cbSJeremy Kerr } 1103125739cbSJeremy Kerr 1104f3aa2c6fSChristopher Bostic np = dev_of_node(&master->dev); 1105f3aa2c6fSChristopher Bostic if (!of_property_read_bool(np, "no-scan-on-init")) 1106414c1026SJeremy Kerr fsi_master_scan(master); 1107cd0fdb5cSChristopher Bostic 1108414c1026SJeremy Kerr return 0; 1109414c1026SJeremy Kerr } 111009aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 111109aecfabSJeremy Kerr 111209aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 111309aecfabSJeremy Kerr { 111409aecfabSJeremy Kerr if (master->idx >= 0) { 111509aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 111609aecfabSJeremy Kerr master->idx = -1; 111709aecfabSJeremy Kerr } 111809aecfabSJeremy Kerr 1119cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 112009aecfabSJeremy Kerr device_unregister(&master->dev); 112109aecfabSJeremy Kerr } 112209aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 112309aecfabSJeremy Kerr 11240508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 11250508ad1fSJeremy Kerr 1126dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 1127dd37eed7SJeremy Kerr { 1128dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 1129dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 1130dd37eed7SJeremy Kerr const struct fsi_device_id *id; 1131dd37eed7SJeremy Kerr 1132dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 1133dd37eed7SJeremy Kerr return 0; 1134dd37eed7SJeremy Kerr 1135dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 1136dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 1137dd37eed7SJeremy Kerr continue; 1138dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 1139dd37eed7SJeremy Kerr id->version == fsi_dev->version) 1140dd37eed7SJeremy Kerr return 1; 1141dd37eed7SJeremy Kerr } 1142dd37eed7SJeremy Kerr 1143dd37eed7SJeremy Kerr return 0; 1144dd37eed7SJeremy Kerr } 1145dd37eed7SJeremy Kerr 1146356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 1147356d8009SChristopher Bostic { 1148356d8009SChristopher Bostic if (!fsi_drv) 1149356d8009SChristopher Bostic return -EINVAL; 1150356d8009SChristopher Bostic if (!fsi_drv->id_table) 1151356d8009SChristopher Bostic return -EINVAL; 1152356d8009SChristopher Bostic 1153356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 1154356d8009SChristopher Bostic } 1155356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 1156356d8009SChristopher Bostic 1157356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 1158356d8009SChristopher Bostic { 1159356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 1160356d8009SChristopher Bostic } 1161356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 1162356d8009SChristopher Bostic 11630508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 11640508ad1fSJeremy Kerr .name = "fsi", 1165dd37eed7SJeremy Kerr .match = fsi_bus_match, 11660508ad1fSJeremy Kerr }; 11670508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 11680508ad1fSJeremy Kerr 1169496f8931SJoel Stanley static int __init fsi_init(void) 11700508ad1fSJeremy Kerr { 11710ab5fe53SBenjamin Herrenschmidt int rc; 11720ab5fe53SBenjamin Herrenschmidt 11730ab5fe53SBenjamin Herrenschmidt rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi"); 11740ab5fe53SBenjamin Herrenschmidt if (rc) 11750ab5fe53SBenjamin Herrenschmidt return rc; 11760ab5fe53SBenjamin Herrenschmidt rc = bus_register(&fsi_bus_type); 11770ab5fe53SBenjamin Herrenschmidt if (rc) 11780ab5fe53SBenjamin Herrenschmidt goto fail_bus; 11790ab5fe53SBenjamin Herrenschmidt return 0; 11800ab5fe53SBenjamin Herrenschmidt 11810ab5fe53SBenjamin Herrenschmidt fail_bus: 11820ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 11830ab5fe53SBenjamin Herrenschmidt return rc; 11840508ad1fSJeremy Kerr } 1185496f8931SJoel Stanley postcore_initcall(fsi_init); 11860508ad1fSJeremy Kerr 11870508ad1fSJeremy Kerr static void fsi_exit(void) 11880508ad1fSJeremy Kerr { 11890508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 11900ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 11910ab5fe53SBenjamin Herrenschmidt ida_destroy(&fsi_minor_ida); 11920508ad1fSJeremy Kerr } 11930508ad1fSJeremy Kerr module_exit(fsi_exit); 11941fa847d7SJeremy Kerr module_param(discard_errors, int, 0664); 1195acb7e8f7SChristopher Bostic MODULE_LICENSE("GPL"); 11961fa847d7SJeremy Kerr MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); 1197