11802d0beSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 20508ad1fSJeremy Kerr /* 30508ad1fSJeremy Kerr * FSI core driver 40508ad1fSJeremy Kerr * 50508ad1fSJeremy Kerr * Copyright (C) IBM Corporation 2016 60508ad1fSJeremy Kerr * 7d1dcd678SBenjamin Herrenschmidt * TODO: 8d1dcd678SBenjamin Herrenschmidt * - Rework topology 9d1dcd678SBenjamin Herrenschmidt * - s/chip_id/chip_loc 10d1dcd678SBenjamin Herrenschmidt * - s/cfam/chip (cfam_id -> chip_id etc...) 110508ad1fSJeremy Kerr */ 120508ad1fSJeremy Kerr 132b545cd8SJeremy Kerr #include <linux/crc4.h> 140508ad1fSJeremy Kerr #include <linux/device.h> 150508ad1fSJeremy Kerr #include <linux/fsi.h> 1609aecfabSJeremy Kerr #include <linux/idr.h> 170508ad1fSJeremy Kerr #include <linux/module.h> 18f6a2f8ebSJeremy Kerr #include <linux/of.h> 192b545cd8SJeremy Kerr #include <linux/slab.h> 20f7ade2a6SJeremy Kerr #include <linux/bitops.h> 21d1dcd678SBenjamin Herrenschmidt #include <linux/cdev.h> 22d1dcd678SBenjamin Herrenschmidt #include <linux/fs.h> 23d1dcd678SBenjamin Herrenschmidt #include <linux/uaccess.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; 81d1dcd678SBenjamin Herrenschmidt struct cdev cdev; 82d1dcd678SBenjamin Herrenschmidt int cdev_idx; 83d1dcd678SBenjamin Herrenschmidt int id; /* FSI address */ 84d1dcd678SBenjamin Herrenschmidt int link; /* FSI link# */ 85d1dcd678SBenjamin Herrenschmidt u32 cfam_id; 860a213777SBenjamin Herrenschmidt int chip_id; 87faf0b116SJeremy Kerr uint32_t size; /* size of slave address space */ 88a2e7da86SBenjamin Herrenschmidt u8 t_send_delay; 89a2e7da86SBenjamin Herrenschmidt u8 t_echo_delay; 90faf0b116SJeremy Kerr }; 91faf0b116SJeremy Kerr 92cd0fdb5cSChristopher Bostic #define to_fsi_master(d) container_of(d, struct fsi_master, dev) 93faf0b116SJeremy Kerr #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) 94faf0b116SJeremy Kerr 951fa847d7SJeremy Kerr static const int slave_retries = 2; 961fa847d7SJeremy Kerr static int discard_errors; 971fa847d7SJeremy Kerr 980ab5fe53SBenjamin Herrenschmidt static dev_t fsi_base_dev; 990ab5fe53SBenjamin Herrenschmidt static DEFINE_IDA(fsi_minor_ida); 1000ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_MAX_DEVICES 0x1000 1010ab5fe53SBenjamin Herrenschmidt 1020ab5fe53SBenjamin Herrenschmidt /* Legacy /dev numbering: 4 devices per chip, 16 chips */ 1030ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_LEGACY_TOP 64 1040ab5fe53SBenjamin Herrenschmidt 105014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 106014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 107014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 108014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 1091fa847d7SJeremy Kerr static int fsi_master_break(struct fsi_master *master, int link); 110014c2abcSJeremy Kerr 1114efe37f4SJeremy Kerr /* 1124efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 1134efe37f4SJeremy Kerr * 1144efe37f4SJeremy Kerr * FSI endpoint-device support 1154efe37f4SJeremy Kerr * 1164efe37f4SJeremy Kerr * Read / write / peek accessors for a client 1174efe37f4SJeremy Kerr * 1184efe37f4SJeremy Kerr * Parameters: 1194efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 1204efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 1214efe37f4SJeremy Kerr * plus desired offset to access its register space. 1224efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 1234efe37f4SJeremy Kerr * write this is value to write to the specified address. 1244efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 1254efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1264efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1274efe37f4SJeremy Kerr */ 1284efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1294efe37f4SJeremy Kerr size_t size) 1304efe37f4SJeremy Kerr { 1314efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1324efe37f4SJeremy Kerr return -EINVAL; 1334efe37f4SJeremy Kerr 1344efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1354efe37f4SJeremy Kerr } 1364efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1374efe37f4SJeremy Kerr 1384efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1394efe37f4SJeremy Kerr size_t size) 1404efe37f4SJeremy Kerr { 1414efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1424efe37f4SJeremy Kerr return -EINVAL; 1434efe37f4SJeremy Kerr 1444efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1454efe37f4SJeremy Kerr } 1464efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1474efe37f4SJeremy Kerr 1484efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1494efe37f4SJeremy Kerr { 1504efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1514efe37f4SJeremy Kerr 1524efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1534efe37f4SJeremy Kerr } 154f7ade2a6SJeremy Kerr 155f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 156f7ade2a6SJeremy Kerr { 157f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 158f7ade2a6SJeremy Kerr 159f6a2f8ebSJeremy Kerr of_node_put(device->dev.of_node); 160f7ade2a6SJeremy Kerr kfree(device); 161f7ade2a6SJeremy Kerr } 162f7ade2a6SJeremy Kerr 163f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 164f7ade2a6SJeremy Kerr { 165f7ade2a6SJeremy Kerr struct fsi_device *dev; 166f7ade2a6SJeremy Kerr 167f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 168f7ade2a6SJeremy Kerr if (!dev) 169f7ade2a6SJeremy Kerr return NULL; 170f7ade2a6SJeremy Kerr 171f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 172f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 173f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 174f7ade2a6SJeremy Kerr 175f7ade2a6SJeremy Kerr return dev; 176f7ade2a6SJeremy Kerr } 177f7ade2a6SJeremy Kerr 178414c1026SJeremy Kerr /* FSI slave support */ 179014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 180014c2abcSJeremy Kerr uint8_t *idp) 181014c2abcSJeremy Kerr { 182014c2abcSJeremy Kerr uint32_t addr = *addrp; 183014c2abcSJeremy Kerr uint8_t id = *idp; 184014c2abcSJeremy Kerr 185014c2abcSJeremy Kerr if (addr > slave->size) 186014c2abcSJeremy Kerr return -EINVAL; 187014c2abcSJeremy Kerr 188014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 189014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 190014c2abcSJeremy Kerr */ 191014c2abcSJeremy Kerr if (addr > 0x1fffff) { 192014c2abcSJeremy Kerr if (slave->id != 0) 193014c2abcSJeremy Kerr return -EINVAL; 194014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 195014c2abcSJeremy Kerr addr &= 0x1fffff; 196014c2abcSJeremy Kerr } 197014c2abcSJeremy Kerr 198014c2abcSJeremy Kerr *addrp = addr; 199014c2abcSJeremy Kerr *idp = id; 200014c2abcSJeremy Kerr return 0; 201014c2abcSJeremy Kerr } 202014c2abcSJeremy Kerr 203ed50a089SColin Ian King static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) 2041fa847d7SJeremy Kerr { 2051fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 20611454d6dSJoel Stanley __be32 irq, stat; 2071fa847d7SJeremy Kerr int rc, link; 2081fa847d7SJeremy Kerr uint8_t id; 2091fa847d7SJeremy Kerr 2101fa847d7SJeremy Kerr link = slave->link; 2111fa847d7SJeremy Kerr id = slave->id; 2121fa847d7SJeremy Kerr 2131fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2141fa847d7SJeremy Kerr &irq, sizeof(irq)); 2151fa847d7SJeremy Kerr if (rc) 2161fa847d7SJeremy Kerr return rc; 2171fa847d7SJeremy Kerr 2181fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, 2191fa847d7SJeremy Kerr &stat, sizeof(stat)); 2201fa847d7SJeremy Kerr if (rc) 2211fa847d7SJeremy Kerr return rc; 2221fa847d7SJeremy Kerr 223638bd9acSChristopher Bostic dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", 2241fa847d7SJeremy Kerr be32_to_cpu(stat), be32_to_cpu(irq)); 2251fa847d7SJeremy Kerr 2261fa847d7SJeremy Kerr /* clear interrupts */ 2271fa847d7SJeremy Kerr return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2281fa847d7SJeremy Kerr &irq, sizeof(irq)); 2291fa847d7SJeremy Kerr } 2301fa847d7SJeremy Kerr 231935f9636SBenjamin Herrenschmidt /* Encode slave local bus echo delay */ 232935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_echodly(int x) 233935f9636SBenjamin Herrenschmidt { 234935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 235935f9636SBenjamin Herrenschmidt } 236935f9636SBenjamin Herrenschmidt 237935f9636SBenjamin Herrenschmidt /* Encode slave local bus send delay */ 238935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_senddly(int x) 239935f9636SBenjamin Herrenschmidt { 240935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 241935f9636SBenjamin Herrenschmidt } 242935f9636SBenjamin Herrenschmidt 243935f9636SBenjamin Herrenschmidt /* Encode slave local bus clock rate ratio */ 244935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_lbcrr(int x) 245935f9636SBenjamin Herrenschmidt { 246935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 247935f9636SBenjamin Herrenschmidt } 248935f9636SBenjamin Herrenschmidt 249935f9636SBenjamin Herrenschmidt /* Encode slave ID */ 250935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_sid(int x) 251935f9636SBenjamin Herrenschmidt { 252935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 253935f9636SBenjamin Herrenschmidt } 254935f9636SBenjamin Herrenschmidt 255a2e7da86SBenjamin Herrenschmidt static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly) 256935f9636SBenjamin Herrenschmidt { 257935f9636SBenjamin Herrenschmidt return FSI_SMODE_WSC | FSI_SMODE_ECRC 258935f9636SBenjamin Herrenschmidt | fsi_smode_sid(id) 259a2e7da86SBenjamin Herrenschmidt | fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1) 260935f9636SBenjamin Herrenschmidt | fsi_smode_lbcrr(0x8); 261935f9636SBenjamin Herrenschmidt } 262935f9636SBenjamin Herrenschmidt 263a2e7da86SBenjamin Herrenschmidt static int fsi_slave_set_smode(struct fsi_slave *slave) 264935f9636SBenjamin Herrenschmidt { 265935f9636SBenjamin Herrenschmidt uint32_t smode; 266935f9636SBenjamin Herrenschmidt __be32 data; 267935f9636SBenjamin Herrenschmidt 268935f9636SBenjamin Herrenschmidt /* set our smode register with the slave ID field to 0; this enables 269935f9636SBenjamin Herrenschmidt * extended slave addressing 270935f9636SBenjamin Herrenschmidt */ 271a2e7da86SBenjamin Herrenschmidt smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay); 272935f9636SBenjamin Herrenschmidt data = cpu_to_be32(smode); 273935f9636SBenjamin Herrenschmidt 274a2e7da86SBenjamin Herrenschmidt return fsi_master_write(slave->master, slave->link, slave->id, 275a2e7da86SBenjamin Herrenschmidt FSI_SLAVE_BASE + FSI_SMODE, 276935f9636SBenjamin Herrenschmidt &data, sizeof(data)); 277935f9636SBenjamin Herrenschmidt } 2781fa847d7SJeremy Kerr 279ed50a089SColin Ian King static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, 280ed50a089SColin Ian King uint32_t addr, size_t size) 2811fa847d7SJeremy Kerr { 2821fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 2831fa847d7SJeremy Kerr int rc, link; 2841fa847d7SJeremy Kerr uint32_t reg; 285a2e7da86SBenjamin Herrenschmidt uint8_t id, send_delay, echo_delay; 2861fa847d7SJeremy Kerr 2871fa847d7SJeremy Kerr if (discard_errors) 2881fa847d7SJeremy Kerr return -1; 2891fa847d7SJeremy Kerr 2901fa847d7SJeremy Kerr link = slave->link; 2911fa847d7SJeremy Kerr id = slave->id; 2921fa847d7SJeremy Kerr 2931fa847d7SJeremy Kerr dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", 2941fa847d7SJeremy Kerr write ? "write" : "read", addr, size); 2951fa847d7SJeremy Kerr 2961fa847d7SJeremy Kerr /* try a simple clear of error conditions, which may fail if we've lost 2971fa847d7SJeremy Kerr * communication with the slave 2981fa847d7SJeremy Kerr */ 2991fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 3001fa847d7SJeremy Kerr if (!rc) 3011fa847d7SJeremy Kerr return 0; 3021fa847d7SJeremy Kerr 3031fa847d7SJeremy Kerr /* send a TERM and retry */ 3041fa847d7SJeremy Kerr if (master->term) { 3051fa847d7SJeremy Kerr rc = master->term(master, link, id); 3061fa847d7SJeremy Kerr if (!rc) { 3071fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, 0, 3081fa847d7SJeremy Kerr ®, sizeof(reg)); 3091fa847d7SJeremy Kerr if (!rc) 3101fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 3111fa847d7SJeremy Kerr if (!rc) 3121fa847d7SJeremy Kerr return 0; 3131fa847d7SJeremy Kerr } 3141fa847d7SJeremy Kerr } 3151fa847d7SJeremy Kerr 316a2e7da86SBenjamin Herrenschmidt send_delay = slave->t_send_delay; 317a2e7da86SBenjamin Herrenschmidt echo_delay = slave->t_echo_delay; 318a2e7da86SBenjamin Herrenschmidt 3191fa847d7SJeremy Kerr /* getting serious, reset the slave via BREAK */ 3201fa847d7SJeremy Kerr rc = fsi_master_break(master, link); 3211fa847d7SJeremy Kerr if (rc) 3221fa847d7SJeremy Kerr return rc; 3231fa847d7SJeremy Kerr 324a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = send_delay; 325a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = echo_delay; 326a2e7da86SBenjamin Herrenschmidt 327a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 3281fa847d7SJeremy Kerr if (rc) 3291fa847d7SJeremy Kerr return rc; 3301fa847d7SJeremy Kerr 331a2e7da86SBenjamin Herrenschmidt if (master->link_config) 332a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 333a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 334a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 335a2e7da86SBenjamin Herrenschmidt 3361fa847d7SJeremy Kerr return fsi_slave_report_and_clear_errors(slave); 3371fa847d7SJeremy Kerr } 3381fa847d7SJeremy Kerr 339da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 340014c2abcSJeremy Kerr void *val, size_t size) 341014c2abcSJeremy Kerr { 342014c2abcSJeremy Kerr uint8_t id = slave->id; 3431fa847d7SJeremy Kerr int rc, err_rc, i; 344014c2abcSJeremy Kerr 345014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 346014c2abcSJeremy Kerr if (rc) 347014c2abcSJeremy Kerr return rc; 348014c2abcSJeremy Kerr 3491fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3501fa847d7SJeremy Kerr rc = fsi_master_read(slave->master, slave->link, 3511fa847d7SJeremy Kerr id, addr, val, size); 3521fa847d7SJeremy Kerr if (!rc) 3531fa847d7SJeremy Kerr break; 3541fa847d7SJeremy Kerr 3551fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, false, addr, size); 3561fa847d7SJeremy Kerr if (err_rc) 3571fa847d7SJeremy Kerr break; 3581fa847d7SJeremy Kerr } 3591fa847d7SJeremy Kerr 3601fa847d7SJeremy Kerr return rc; 361014c2abcSJeremy Kerr } 362da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 363014c2abcSJeremy Kerr 364da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 365014c2abcSJeremy Kerr const void *val, size_t size) 366014c2abcSJeremy Kerr { 367014c2abcSJeremy Kerr uint8_t id = slave->id; 3681fa847d7SJeremy Kerr int rc, err_rc, i; 369014c2abcSJeremy Kerr 370014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 371014c2abcSJeremy Kerr if (rc) 372014c2abcSJeremy Kerr return rc; 373014c2abcSJeremy Kerr 3741fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3751fa847d7SJeremy Kerr rc = fsi_master_write(slave->master, slave->link, 3761fa847d7SJeremy Kerr id, addr, val, size); 3771fa847d7SJeremy Kerr if (!rc) 3781fa847d7SJeremy Kerr break; 3791fa847d7SJeremy Kerr 3801fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, true, addr, size); 3811fa847d7SJeremy Kerr if (err_rc) 3821fa847d7SJeremy Kerr break; 3831fa847d7SJeremy Kerr } 3841fa847d7SJeremy Kerr 3851fa847d7SJeremy Kerr return rc; 386014c2abcSJeremy Kerr } 387da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 388da36cadfSJeremy Kerr 389da36cadfSJeremy Kerr extern int fsi_slave_claim_range(struct fsi_slave *slave, 390da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 391da36cadfSJeremy Kerr { 392da36cadfSJeremy Kerr if (addr + size < addr) 393da36cadfSJeremy Kerr return -EINVAL; 394da36cadfSJeremy Kerr 395da36cadfSJeremy Kerr if (addr + size > slave->size) 396da36cadfSJeremy Kerr return -EINVAL; 397da36cadfSJeremy Kerr 398da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 399da36cadfSJeremy Kerr return 0; 400da36cadfSJeremy Kerr } 401da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 402da36cadfSJeremy Kerr 403da36cadfSJeremy Kerr extern void fsi_slave_release_range(struct fsi_slave *slave, 404da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 405da36cadfSJeremy Kerr { 406da36cadfSJeremy Kerr } 407da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 408014c2abcSJeremy Kerr 409f6a2f8ebSJeremy Kerr static bool fsi_device_node_matches(struct device *dev, struct device_node *np, 410f6a2f8ebSJeremy Kerr uint32_t addr, uint32_t size) 411f6a2f8ebSJeremy Kerr { 412f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 413f6a2f8ebSJeremy Kerr const __be32 *prop; 414f6a2f8ebSJeremy Kerr uint32_t psize; 415f6a2f8ebSJeremy Kerr 416f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 417f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 418f6a2f8ebSJeremy Kerr 419f6a2f8ebSJeremy Kerr if (na != 1 || ns != 1) 420f6a2f8ebSJeremy Kerr return false; 421f6a2f8ebSJeremy Kerr 422f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 423f6a2f8ebSJeremy Kerr if (!prop || len != 8) 424f6a2f8ebSJeremy Kerr return false; 425f6a2f8ebSJeremy Kerr 426f6a2f8ebSJeremy Kerr if (of_read_number(prop, 1) != addr) 427f6a2f8ebSJeremy Kerr return false; 428f6a2f8ebSJeremy Kerr 429f6a2f8ebSJeremy Kerr psize = of_read_number(prop + 1, 1); 430f6a2f8ebSJeremy Kerr if (psize != size) { 431f6a2f8ebSJeremy Kerr dev_warn(dev, 432f6a2f8ebSJeremy Kerr "node %s matches probed address, but not size (got 0x%x, expected 0x%x)", 433f6a2f8ebSJeremy Kerr of_node_full_name(np), psize, size); 434f6a2f8ebSJeremy Kerr } 435f6a2f8ebSJeremy Kerr 436f6a2f8ebSJeremy Kerr return true; 437f6a2f8ebSJeremy Kerr } 438f6a2f8ebSJeremy Kerr 439f6a2f8ebSJeremy Kerr /* Find a matching node for the slave engine at @address, using @size bytes 440f6a2f8ebSJeremy Kerr * of space. Returns NULL if not found, or a matching node with refcount 441f6a2f8ebSJeremy Kerr * already incremented. 442f6a2f8ebSJeremy Kerr */ 443f6a2f8ebSJeremy Kerr static struct device_node *fsi_device_find_of_node(struct fsi_device *dev) 444f6a2f8ebSJeremy Kerr { 445f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 446f6a2f8ebSJeremy Kerr 447f6a2f8ebSJeremy Kerr parent = dev_of_node(&dev->slave->dev); 448f6a2f8ebSJeremy Kerr if (!parent) 449f6a2f8ebSJeremy Kerr return NULL; 450f6a2f8ebSJeremy Kerr 451f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 452f6a2f8ebSJeremy Kerr if (fsi_device_node_matches(&dev->dev, np, 453f6a2f8ebSJeremy Kerr dev->addr, dev->size)) 454f6a2f8ebSJeremy Kerr return np; 455f6a2f8ebSJeremy Kerr } 456f6a2f8ebSJeremy Kerr 457f6a2f8ebSJeremy Kerr return NULL; 458f6a2f8ebSJeremy Kerr } 459f6a2f8ebSJeremy Kerr 460f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 461f7ade2a6SJeremy Kerr { 462f7ade2a6SJeremy Kerr uint32_t engine_addr; 463f7ade2a6SJeremy Kerr int rc, i; 464f7ade2a6SJeremy Kerr 465f7ade2a6SJeremy Kerr /* 466f7ade2a6SJeremy Kerr * scan engines 467f7ade2a6SJeremy Kerr * 468f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 469f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 470f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 471f7ade2a6SJeremy Kerr */ 472f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 473f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 474f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 475f7ade2a6SJeremy Kerr struct fsi_device *dev; 47611454d6dSJoel Stanley uint32_t conf; 47711454d6dSJoel Stanley __be32 data; 478f7ade2a6SJeremy Kerr 47911454d6dSJoel Stanley rc = fsi_slave_read(slave, (i + 1) * sizeof(data), 48011454d6dSJoel Stanley &data, sizeof(data)); 481f7ade2a6SJeremy Kerr if (rc) { 482f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 483f7ade2a6SJeremy Kerr "error reading slave registers\n"); 484f7ade2a6SJeremy Kerr return -1; 485f7ade2a6SJeremy Kerr } 48611454d6dSJoel Stanley conf = be32_to_cpu(data); 487f7ade2a6SJeremy Kerr 488f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 489f7ade2a6SJeremy Kerr if (crc) { 490f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 491f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 492f7ade2a6SJeremy Kerr i); 493f7ade2a6SJeremy Kerr return -1; 494f7ade2a6SJeremy Kerr } 495f7ade2a6SJeremy Kerr 496f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 497f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 498f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 499f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 500f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 501f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 502f7ade2a6SJeremy Kerr 503f7ade2a6SJeremy Kerr /* 504f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 505f7ade2a6SJeremy Kerr * skips the defined address areas 506f7ade2a6SJeremy Kerr */ 507f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 508f7ade2a6SJeremy Kerr 509f7ade2a6SJeremy Kerr /* create device */ 510f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 511f7ade2a6SJeremy Kerr if (!dev) 512f7ade2a6SJeremy Kerr return -ENOMEM; 513f7ade2a6SJeremy Kerr 514f7ade2a6SJeremy Kerr dev->slave = slave; 515f7ade2a6SJeremy Kerr dev->engine_type = type; 516f7ade2a6SJeremy Kerr dev->version = version; 517f7ade2a6SJeremy Kerr dev->unit = i; 518f7ade2a6SJeremy Kerr dev->addr = engine_addr; 519f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 520f7ade2a6SJeremy Kerr 521f7ade2a6SJeremy Kerr dev_dbg(&slave->dev, 522f7ade2a6SJeremy Kerr "engine[%i]: type %x, version %x, addr %x size %x\n", 523f7ade2a6SJeremy Kerr dev->unit, dev->engine_type, version, 524f7ade2a6SJeremy Kerr dev->addr, dev->size); 525f7ade2a6SJeremy Kerr 526f7ade2a6SJeremy Kerr dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", 527f7ade2a6SJeremy Kerr slave->master->idx, slave->link, 528f7ade2a6SJeremy Kerr slave->id, i - 2); 529f6a2f8ebSJeremy Kerr dev->dev.of_node = fsi_device_find_of_node(dev); 530f7ade2a6SJeremy Kerr 531f7ade2a6SJeremy Kerr rc = device_register(&dev->dev); 532f7ade2a6SJeremy Kerr if (rc) { 533f7ade2a6SJeremy Kerr dev_warn(&slave->dev, "add failed: %d\n", rc); 534f7ade2a6SJeremy Kerr put_device(&dev->dev); 535f7ade2a6SJeremy Kerr } 536f7ade2a6SJeremy Kerr } 537f7ade2a6SJeremy Kerr 538f7ade2a6SJeremy Kerr engine_addr += slots * engine_page_size; 539f7ade2a6SJeremy Kerr 540f7ade2a6SJeremy Kerr if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) 541f7ade2a6SJeremy Kerr break; 542f7ade2a6SJeremy Kerr } 543f7ade2a6SJeremy Kerr 544f7ade2a6SJeremy Kerr return 0; 545f7ade2a6SJeremy Kerr } 546f7ade2a6SJeremy Kerr 5479f4c2b51SAndrew Jeffery static unsigned long aligned_access_size(size_t offset, size_t count) 5489f4c2b51SAndrew Jeffery { 5499f4c2b51SAndrew Jeffery unsigned long offset_unit, count_unit; 5509f4c2b51SAndrew Jeffery 5519f4c2b51SAndrew Jeffery /* Criteria: 5529f4c2b51SAndrew Jeffery * 5539f4c2b51SAndrew Jeffery * 1. Access size must be less than or equal to the maximum access 5549f4c2b51SAndrew Jeffery * width or the highest power-of-two factor of offset 5559f4c2b51SAndrew Jeffery * 2. Access size must be less than or equal to the amount specified by 5569f4c2b51SAndrew Jeffery * count 5579f4c2b51SAndrew Jeffery * 5589f4c2b51SAndrew Jeffery * The access width is optimal if we can calculate 1 to be strictly 5599f4c2b51SAndrew Jeffery * equal while still satisfying 2. 5609f4c2b51SAndrew Jeffery */ 5619f4c2b51SAndrew Jeffery 5629f4c2b51SAndrew Jeffery /* Find 1 by the bottom bit of offset (with a 4 byte access cap) */ 5639f4c2b51SAndrew Jeffery offset_unit = BIT(__builtin_ctzl(offset | 4)); 5649f4c2b51SAndrew Jeffery 5659f4c2b51SAndrew Jeffery /* Find 2 by the top bit of count */ 5669f4c2b51SAndrew Jeffery count_unit = BIT(8 * sizeof(unsigned long) - 1 - __builtin_clzl(count)); 5679f4c2b51SAndrew Jeffery 5689f4c2b51SAndrew Jeffery /* Constrain the maximum access width to the minimum of both criteria */ 5699f4c2b51SAndrew Jeffery return BIT(__builtin_ctzl(offset_unit | count_unit)); 5709f4c2b51SAndrew Jeffery } 5719f4c2b51SAndrew Jeffery 572125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 573125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 574125739cbSJeremy Kerr 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, read_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 += read_len) { 5879f4c2b51SAndrew Jeffery read_len = aligned_access_size(off, count - total_len); 588125739cbSJeremy Kerr 589125739cbSJeremy Kerr rc = fsi_slave_read(slave, off, buf + total_len, read_len); 590125739cbSJeremy Kerr if (rc) 591125739cbSJeremy Kerr return rc; 592125739cbSJeremy Kerr 593125739cbSJeremy Kerr off += read_len; 594125739cbSJeremy Kerr } 595125739cbSJeremy Kerr 596125739cbSJeremy Kerr return count; 597125739cbSJeremy Kerr } 598125739cbSJeremy Kerr 599125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_write(struct file *file, 600125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 601125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 602125739cbSJeremy Kerr { 603125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 604125739cbSJeremy Kerr size_t total_len, write_len; 605125739cbSJeremy Kerr int rc; 606125739cbSJeremy Kerr 607125739cbSJeremy Kerr if (off < 0) 608125739cbSJeremy Kerr return -EINVAL; 609125739cbSJeremy Kerr 610125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 611125739cbSJeremy Kerr return -EINVAL; 612125739cbSJeremy Kerr 613125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += write_len) { 6149f4c2b51SAndrew Jeffery write_len = aligned_access_size(off, count - total_len); 615125739cbSJeremy Kerr 616125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 617125739cbSJeremy Kerr if (rc) 618125739cbSJeremy Kerr return rc; 619125739cbSJeremy Kerr 620125739cbSJeremy Kerr off += write_len; 621125739cbSJeremy Kerr } 622125739cbSJeremy Kerr 623125739cbSJeremy Kerr return count; 624125739cbSJeremy Kerr } 625125739cbSJeremy Kerr 626061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_raw_attr = { 627125739cbSJeremy Kerr .attr = { 628125739cbSJeremy Kerr .name = "raw", 629125739cbSJeremy Kerr .mode = 0600, 630125739cbSJeremy Kerr }, 631125739cbSJeremy Kerr .size = 0, 632125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 633125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 634125739cbSJeremy Kerr }; 635125739cbSJeremy Kerr 6362b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 6372b545cd8SJeremy Kerr { 6382b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 6392b545cd8SJeremy Kerr 6400ab5fe53SBenjamin Herrenschmidt fsi_free_minor(slave->dev.devt); 641f6a2f8ebSJeremy Kerr of_node_put(dev->of_node); 6422b545cd8SJeremy Kerr kfree(slave); 6432b545cd8SJeremy Kerr } 6442b545cd8SJeremy Kerr 645f6a2f8ebSJeremy Kerr static bool fsi_slave_node_matches(struct device_node *np, 646f6a2f8ebSJeremy Kerr int link, uint8_t id) 647f6a2f8ebSJeremy Kerr { 648f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 649f6a2f8ebSJeremy Kerr const __be32 *prop; 650f6a2f8ebSJeremy Kerr 651f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 652f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 653f6a2f8ebSJeremy Kerr 654f6a2f8ebSJeremy Kerr /* Ensure we have the correct format for addresses and sizes in 655f6a2f8ebSJeremy Kerr * reg properties 656f6a2f8ebSJeremy Kerr */ 657f6a2f8ebSJeremy Kerr if (na != 2 || ns != 0) 658f6a2f8ebSJeremy Kerr return false; 659f6a2f8ebSJeremy Kerr 660f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 661f6a2f8ebSJeremy Kerr if (!prop || len != 8) 662f6a2f8ebSJeremy Kerr return false; 663f6a2f8ebSJeremy Kerr 664f6a2f8ebSJeremy Kerr return (of_read_number(prop, 1) == link) && 665f6a2f8ebSJeremy Kerr (of_read_number(prop + 1, 1) == id); 666f6a2f8ebSJeremy Kerr } 667f6a2f8ebSJeremy Kerr 668f6a2f8ebSJeremy Kerr /* Find a matching node for the slave at (link, id). Returns NULL if none 669f6a2f8ebSJeremy Kerr * found, or a matching node with refcount already incremented. 670f6a2f8ebSJeremy Kerr */ 671f6a2f8ebSJeremy Kerr static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, 672f6a2f8ebSJeremy Kerr int link, uint8_t id) 673f6a2f8ebSJeremy Kerr { 674f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 675f6a2f8ebSJeremy Kerr 676f6a2f8ebSJeremy Kerr parent = dev_of_node(&master->dev); 677f6a2f8ebSJeremy Kerr if (!parent) 678f6a2f8ebSJeremy Kerr return NULL; 679f6a2f8ebSJeremy Kerr 680f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 681f6a2f8ebSJeremy Kerr if (fsi_slave_node_matches(np, link, id)) 682f6a2f8ebSJeremy Kerr return np; 683f6a2f8ebSJeremy Kerr } 684f6a2f8ebSJeremy Kerr 685f6a2f8ebSJeremy Kerr return NULL; 686f6a2f8ebSJeremy Kerr } 687f6a2f8ebSJeremy Kerr 688d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count, 689d1dcd678SBenjamin Herrenschmidt loff_t *offset) 690d1dcd678SBenjamin Herrenschmidt { 691d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 692d1dcd678SBenjamin Herrenschmidt size_t total_len, read_len; 693d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 694d1dcd678SBenjamin Herrenschmidt ssize_t rc; 695d1dcd678SBenjamin Herrenschmidt 696d1dcd678SBenjamin Herrenschmidt if (off < 0) 697d1dcd678SBenjamin Herrenschmidt return -EINVAL; 698d1dcd678SBenjamin Herrenschmidt 699d1dcd678SBenjamin Herrenschmidt if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 700d1dcd678SBenjamin Herrenschmidt return -EINVAL; 701d1dcd678SBenjamin Herrenschmidt 702d1dcd678SBenjamin Herrenschmidt for (total_len = 0; total_len < count; total_len += read_len) { 703d1dcd678SBenjamin Herrenschmidt __be32 data; 704d1dcd678SBenjamin Herrenschmidt 705d1dcd678SBenjamin Herrenschmidt read_len = min_t(size_t, count, 4); 706d1dcd678SBenjamin Herrenschmidt read_len -= off & 0x3; 707d1dcd678SBenjamin Herrenschmidt 708d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_read(slave, off, &data, read_len); 709d1dcd678SBenjamin Herrenschmidt if (rc) 710d1dcd678SBenjamin Herrenschmidt goto fail; 711d1dcd678SBenjamin Herrenschmidt rc = copy_to_user(buf + total_len, &data, read_len); 712d1dcd678SBenjamin Herrenschmidt if (rc) { 713d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 714d1dcd678SBenjamin Herrenschmidt goto fail; 715d1dcd678SBenjamin Herrenschmidt } 716d1dcd678SBenjamin Herrenschmidt off += read_len; 717d1dcd678SBenjamin Herrenschmidt } 718d1dcd678SBenjamin Herrenschmidt rc = count; 719d1dcd678SBenjamin Herrenschmidt fail: 720d1dcd678SBenjamin Herrenschmidt *offset = off; 721d1dcd678SBenjamin Herrenschmidt return count; 722d1dcd678SBenjamin Herrenschmidt } 723d1dcd678SBenjamin Herrenschmidt 724d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_write(struct file *filep, const char __user *buf, 725d1dcd678SBenjamin Herrenschmidt size_t count, loff_t *offset) 726d1dcd678SBenjamin Herrenschmidt { 727d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 728d1dcd678SBenjamin Herrenschmidt size_t total_len, write_len; 729d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 730d1dcd678SBenjamin Herrenschmidt ssize_t rc; 731d1dcd678SBenjamin Herrenschmidt 732d1dcd678SBenjamin Herrenschmidt 733d1dcd678SBenjamin Herrenschmidt if (off < 0) 734d1dcd678SBenjamin Herrenschmidt return -EINVAL; 735d1dcd678SBenjamin Herrenschmidt 736d1dcd678SBenjamin Herrenschmidt if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 737d1dcd678SBenjamin Herrenschmidt return -EINVAL; 738d1dcd678SBenjamin Herrenschmidt 739d1dcd678SBenjamin Herrenschmidt for (total_len = 0; total_len < count; total_len += write_len) { 740d1dcd678SBenjamin Herrenschmidt __be32 data; 741d1dcd678SBenjamin Herrenschmidt 742d1dcd678SBenjamin Herrenschmidt write_len = min_t(size_t, count, 4); 743d1dcd678SBenjamin Herrenschmidt write_len -= off & 0x3; 744d1dcd678SBenjamin Herrenschmidt 745d1dcd678SBenjamin Herrenschmidt rc = copy_from_user(&data, buf + total_len, write_len); 746d1dcd678SBenjamin Herrenschmidt if (rc) { 747d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 748d1dcd678SBenjamin Herrenschmidt goto fail; 749d1dcd678SBenjamin Herrenschmidt } 750d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_write(slave, off, &data, write_len); 751d1dcd678SBenjamin Herrenschmidt if (rc) 752d1dcd678SBenjamin Herrenschmidt goto fail; 753d1dcd678SBenjamin Herrenschmidt off += write_len; 754d1dcd678SBenjamin Herrenschmidt } 755d1dcd678SBenjamin Herrenschmidt rc = count; 756d1dcd678SBenjamin Herrenschmidt fail: 757d1dcd678SBenjamin Herrenschmidt *offset = off; 758d1dcd678SBenjamin Herrenschmidt return count; 759d1dcd678SBenjamin Herrenschmidt } 760d1dcd678SBenjamin Herrenschmidt 761d1dcd678SBenjamin Herrenschmidt static loff_t cfam_llseek(struct file *file, loff_t offset, int whence) 762d1dcd678SBenjamin Herrenschmidt { 763d1dcd678SBenjamin Herrenschmidt switch (whence) { 764d1dcd678SBenjamin Herrenschmidt case SEEK_CUR: 765d1dcd678SBenjamin Herrenschmidt break; 766d1dcd678SBenjamin Herrenschmidt case SEEK_SET: 767d1dcd678SBenjamin Herrenschmidt file->f_pos = offset; 768d1dcd678SBenjamin Herrenschmidt break; 769d1dcd678SBenjamin Herrenschmidt default: 770d1dcd678SBenjamin Herrenschmidt return -EINVAL; 771d1dcd678SBenjamin Herrenschmidt } 772d1dcd678SBenjamin Herrenschmidt 773d1dcd678SBenjamin Herrenschmidt return offset; 774d1dcd678SBenjamin Herrenschmidt } 775d1dcd678SBenjamin Herrenschmidt 776d1dcd678SBenjamin Herrenschmidt static int cfam_open(struct inode *inode, struct file *file) 777d1dcd678SBenjamin Herrenschmidt { 778d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev); 779d1dcd678SBenjamin Herrenschmidt 780d1dcd678SBenjamin Herrenschmidt file->private_data = slave; 781d1dcd678SBenjamin Herrenschmidt 782d1dcd678SBenjamin Herrenschmidt return 0; 783d1dcd678SBenjamin Herrenschmidt } 784d1dcd678SBenjamin Herrenschmidt 785d1dcd678SBenjamin Herrenschmidt static const struct file_operations cfam_fops = { 786d1dcd678SBenjamin Herrenschmidt .owner = THIS_MODULE, 787d1dcd678SBenjamin Herrenschmidt .open = cfam_open, 788d1dcd678SBenjamin Herrenschmidt .llseek = cfam_llseek, 789d1dcd678SBenjamin Herrenschmidt .read = cfam_read, 790d1dcd678SBenjamin Herrenschmidt .write = cfam_write, 791d1dcd678SBenjamin Herrenschmidt }; 792d1dcd678SBenjamin Herrenschmidt 793d1dcd678SBenjamin Herrenschmidt static ssize_t send_term_store(struct device *dev, 794d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 795d1dcd678SBenjamin Herrenschmidt const char *buf, size_t count) 796d1dcd678SBenjamin Herrenschmidt { 797d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 798d1dcd678SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 799d1dcd678SBenjamin Herrenschmidt 800d1dcd678SBenjamin Herrenschmidt if (!master->term) 801d1dcd678SBenjamin Herrenschmidt return -ENODEV; 802d1dcd678SBenjamin Herrenschmidt 803d1dcd678SBenjamin Herrenschmidt master->term(master, slave->link, slave->id); 804d1dcd678SBenjamin Herrenschmidt return count; 805d1dcd678SBenjamin Herrenschmidt } 806d1dcd678SBenjamin Herrenschmidt 807d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_WO(send_term); 808d1dcd678SBenjamin Herrenschmidt 809a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_show(struct device *dev, 810a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, 811a2e7da86SBenjamin Herrenschmidt char *buf) 812a2e7da86SBenjamin Herrenschmidt { 813a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 814a2e7da86SBenjamin Herrenschmidt 815a2e7da86SBenjamin Herrenschmidt return sprintf(buf, "%u\n", slave->t_send_delay); 816a2e7da86SBenjamin Herrenschmidt } 817a2e7da86SBenjamin Herrenschmidt 818a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_store(struct device *dev, 819a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, const char *buf, size_t count) 820a2e7da86SBenjamin Herrenschmidt { 821a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 822a2e7da86SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 823a2e7da86SBenjamin Herrenschmidt unsigned long val; 824a2e7da86SBenjamin Herrenschmidt int rc; 825a2e7da86SBenjamin Herrenschmidt 826a2e7da86SBenjamin Herrenschmidt if (kstrtoul(buf, 0, &val) < 0) 827a2e7da86SBenjamin Herrenschmidt return -EINVAL; 828a2e7da86SBenjamin Herrenschmidt 829a2e7da86SBenjamin Herrenschmidt if (val < 1 || val > 16) 830a2e7da86SBenjamin Herrenschmidt return -EINVAL; 831a2e7da86SBenjamin Herrenschmidt 832a2e7da86SBenjamin Herrenschmidt if (!master->link_config) 833a2e7da86SBenjamin Herrenschmidt return -ENXIO; 834a2e7da86SBenjamin Herrenschmidt 835a2e7da86SBenjamin Herrenschmidt /* Current HW mandates that send and echo delay are identical */ 836a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = val; 837a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = val; 838a2e7da86SBenjamin Herrenschmidt 839a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 840a2e7da86SBenjamin Herrenschmidt if (rc < 0) 841a2e7da86SBenjamin Herrenschmidt return rc; 842a2e7da86SBenjamin Herrenschmidt if (master->link_config) 843a2e7da86SBenjamin Herrenschmidt master->link_config(master, slave->link, 844a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 845a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 846a2e7da86SBenjamin Herrenschmidt 847a2e7da86SBenjamin Herrenschmidt return count; 848a2e7da86SBenjamin Herrenschmidt } 849a2e7da86SBenjamin Herrenschmidt 850a2e7da86SBenjamin Herrenschmidt static DEVICE_ATTR(send_echo_delays, 0600, 851a2e7da86SBenjamin Herrenschmidt slave_send_echo_show, slave_send_echo_store); 852a2e7da86SBenjamin Herrenschmidt 8530a213777SBenjamin Herrenschmidt static ssize_t chip_id_show(struct device *dev, 8540a213777SBenjamin Herrenschmidt struct device_attribute *attr, 8550a213777SBenjamin Herrenschmidt char *buf) 8560a213777SBenjamin Herrenschmidt { 8570a213777SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 8580a213777SBenjamin Herrenschmidt 8590a213777SBenjamin Herrenschmidt return sprintf(buf, "%d\n", slave->chip_id); 8600a213777SBenjamin Herrenschmidt } 8610a213777SBenjamin Herrenschmidt 8620a213777SBenjamin Herrenschmidt static DEVICE_ATTR_RO(chip_id); 8630a213777SBenjamin Herrenschmidt 864d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_id_show(struct device *dev, 865d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 866d1dcd678SBenjamin Herrenschmidt char *buf) 867d1dcd678SBenjamin Herrenschmidt { 868d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 869d1dcd678SBenjamin Herrenschmidt 870d1dcd678SBenjamin Herrenschmidt return sprintf(buf, "0x%x\n", slave->cfam_id); 871d1dcd678SBenjamin Herrenschmidt } 872d1dcd678SBenjamin Herrenschmidt 873d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_RO(cfam_id); 874d1dcd678SBenjamin Herrenschmidt 875d1dcd678SBenjamin Herrenschmidt static struct attribute *cfam_attr[] = { 876d1dcd678SBenjamin Herrenschmidt &dev_attr_send_echo_delays.attr, 877d1dcd678SBenjamin Herrenschmidt &dev_attr_chip_id.attr, 878d1dcd678SBenjamin Herrenschmidt &dev_attr_cfam_id.attr, 879d1dcd678SBenjamin Herrenschmidt &dev_attr_send_term.attr, 880d1dcd678SBenjamin Herrenschmidt NULL, 881d1dcd678SBenjamin Herrenschmidt }; 882d1dcd678SBenjamin Herrenschmidt 883d1dcd678SBenjamin Herrenschmidt static const struct attribute_group cfam_attr_group = { 884d1dcd678SBenjamin Herrenschmidt .attrs = cfam_attr, 885d1dcd678SBenjamin Herrenschmidt }; 886d1dcd678SBenjamin Herrenschmidt 887d1dcd678SBenjamin Herrenschmidt static const struct attribute_group *cfam_attr_groups[] = { 888d1dcd678SBenjamin Herrenschmidt &cfam_attr_group, 889d1dcd678SBenjamin Herrenschmidt NULL, 890d1dcd678SBenjamin Herrenschmidt }; 891d1dcd678SBenjamin Herrenschmidt 892d1dcd678SBenjamin Herrenschmidt static char *cfam_devnode(struct device *dev, umode_t *mode, 893d1dcd678SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 894d1dcd678SBenjamin Herrenschmidt { 895d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 896d1dcd678SBenjamin Herrenschmidt 897d1dcd678SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 898d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx); 899d1dcd678SBenjamin Herrenschmidt #else 900d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx); 901d1dcd678SBenjamin Herrenschmidt #endif 902d1dcd678SBenjamin Herrenschmidt } 903d1dcd678SBenjamin Herrenschmidt 904d1dcd678SBenjamin Herrenschmidt static const struct device_type cfam_type = { 905d1dcd678SBenjamin Herrenschmidt .name = "cfam", 906d1dcd678SBenjamin Herrenschmidt .devnode = cfam_devnode, 907d1dcd678SBenjamin Herrenschmidt .groups = cfam_attr_groups 908d1dcd678SBenjamin Herrenschmidt }; 909d1dcd678SBenjamin Herrenschmidt 9100ab5fe53SBenjamin Herrenschmidt static char *fsi_cdev_devnode(struct device *dev, umode_t *mode, 9110ab5fe53SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 9120ab5fe53SBenjamin Herrenschmidt { 9130ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 9140ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev)); 9150ab5fe53SBenjamin Herrenschmidt #else 9160ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 9170ab5fe53SBenjamin Herrenschmidt #endif 9180ab5fe53SBenjamin Herrenschmidt } 9190ab5fe53SBenjamin Herrenschmidt 9200ab5fe53SBenjamin Herrenschmidt const struct device_type fsi_cdev_type = { 9210ab5fe53SBenjamin Herrenschmidt .name = "fsi-cdev", 9220ab5fe53SBenjamin Herrenschmidt .devnode = fsi_cdev_devnode, 9230ab5fe53SBenjamin Herrenschmidt }; 9240ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_cdev_type); 9250ab5fe53SBenjamin Herrenschmidt 9260ab5fe53SBenjamin Herrenschmidt /* Backward compatible /dev/ numbering in "old style" mode */ 9270ab5fe53SBenjamin Herrenschmidt static int fsi_adjust_index(int index) 9280ab5fe53SBenjamin Herrenschmidt { 9290ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 9300ab5fe53SBenjamin Herrenschmidt return index; 9310ab5fe53SBenjamin Herrenschmidt #else 9320ab5fe53SBenjamin Herrenschmidt return index + 1; 9330ab5fe53SBenjamin Herrenschmidt #endif 9340ab5fe53SBenjamin Herrenschmidt } 9350ab5fe53SBenjamin Herrenschmidt 9360ab5fe53SBenjamin Herrenschmidt static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type, 9370ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9380ab5fe53SBenjamin Herrenschmidt { 9390ab5fe53SBenjamin Herrenschmidt int cid = slave->chip_id; 9400ab5fe53SBenjamin Herrenschmidt int id; 9410ab5fe53SBenjamin Herrenschmidt 9420ab5fe53SBenjamin Herrenschmidt /* Check if we qualify for legacy numbering */ 9430ab5fe53SBenjamin Herrenschmidt if (cid >= 0 && cid < 16 && type < 4) { 9440ab5fe53SBenjamin Herrenschmidt /* Try reserving the legacy number */ 9450ab5fe53SBenjamin Herrenschmidt id = (cid << 4) | type; 9460ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); 9470ab5fe53SBenjamin Herrenschmidt if (id >= 0) { 9480ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(cid); 9490ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9500ab5fe53SBenjamin Herrenschmidt return 0; 9510ab5fe53SBenjamin Herrenschmidt } 9520ab5fe53SBenjamin Herrenschmidt /* Other failure */ 9530ab5fe53SBenjamin Herrenschmidt if (id != -ENOSPC) 9540ab5fe53SBenjamin Herrenschmidt return id; 9550ab5fe53SBenjamin Herrenschmidt /* Fallback to non-legacy allocation */ 9560ab5fe53SBenjamin Herrenschmidt } 9570ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP, 9580ab5fe53SBenjamin Herrenschmidt FSI_CHAR_MAX_DEVICES, GFP_KERNEL); 9590ab5fe53SBenjamin Herrenschmidt if (id < 0) 9600ab5fe53SBenjamin Herrenschmidt return id; 9610ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(id); 9620ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9630ab5fe53SBenjamin Herrenschmidt return 0; 9640ab5fe53SBenjamin Herrenschmidt } 9650ab5fe53SBenjamin Herrenschmidt 9660ab5fe53SBenjamin Herrenschmidt int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type, 9670ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9680ab5fe53SBenjamin Herrenschmidt { 9690ab5fe53SBenjamin Herrenschmidt return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index); 9700ab5fe53SBenjamin Herrenschmidt } 9710ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_get_new_minor); 9720ab5fe53SBenjamin Herrenschmidt 9730ab5fe53SBenjamin Herrenschmidt void fsi_free_minor(dev_t dev) 9740ab5fe53SBenjamin Herrenschmidt { 9750ab5fe53SBenjamin Herrenschmidt ida_simple_remove(&fsi_minor_ida, MINOR(dev)); 9760ab5fe53SBenjamin Herrenschmidt } 9770ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_free_minor); 9780ab5fe53SBenjamin Herrenschmidt 979414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 980414c1026SJeremy Kerr { 981d1dcd678SBenjamin Herrenschmidt uint32_t cfam_id; 9822b545cd8SJeremy Kerr struct fsi_slave *slave; 9832b545cd8SJeremy Kerr uint8_t crc; 98411454d6dSJoel Stanley __be32 data, llmode; 9852b545cd8SJeremy Kerr int rc; 986414c1026SJeremy Kerr 9872b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 9882b545cd8SJeremy Kerr * full 23-bit address range 9892b545cd8SJeremy Kerr */ 9902b545cd8SJeremy Kerr if (id != 0) 9912b545cd8SJeremy Kerr return -EINVAL; 9922b545cd8SJeremy Kerr 99311454d6dSJoel Stanley rc = fsi_master_read(master, link, id, 0, &data, sizeof(data)); 9942b545cd8SJeremy Kerr if (rc) { 9952b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 9962b545cd8SJeremy Kerr link, id, rc); 997414c1026SJeremy Kerr return -ENODEV; 998414c1026SJeremy Kerr } 999d1dcd678SBenjamin Herrenschmidt cfam_id = be32_to_cpu(data); 10002b545cd8SJeremy Kerr 1001d1dcd678SBenjamin Herrenschmidt crc = crc4(0, cfam_id, 32); 10022b545cd8SJeremy Kerr if (crc) { 1003d1dcd678SBenjamin Herrenschmidt dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n", 10042b545cd8SJeremy Kerr link, id); 10052b545cd8SJeremy Kerr return -EIO; 10062b545cd8SJeremy Kerr } 10072b545cd8SJeremy Kerr 1008638bd9acSChristopher Bostic dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 1009d1dcd678SBenjamin Herrenschmidt cfam_id, master->idx, link, id); 10102b545cd8SJeremy Kerr 10114af889b0SJeremy Kerr /* If we're behind a master that doesn't provide a self-running bus 10124af889b0SJeremy Kerr * clock, put the slave into async mode 10134af889b0SJeremy Kerr */ 10144af889b0SJeremy Kerr if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { 10154af889b0SJeremy Kerr llmode = cpu_to_be32(FSI_LLMODE_ASYNC); 10164af889b0SJeremy Kerr rc = fsi_master_write(master, link, id, 10174af889b0SJeremy Kerr FSI_SLAVE_BASE + FSI_LLMODE, 10184af889b0SJeremy Kerr &llmode, sizeof(llmode)); 10194af889b0SJeremy Kerr if (rc) 10204af889b0SJeremy Kerr dev_warn(&master->dev, 10214af889b0SJeremy Kerr "can't set llmode on slave:%02x:%02x %d\n", 10224af889b0SJeremy Kerr link, id, rc); 10234af889b0SJeremy Kerr } 10244af889b0SJeremy Kerr 10252b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 10262b545cd8SJeremy Kerr * register. 10272b545cd8SJeremy Kerr */ 10282b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 10292b545cd8SJeremy Kerr if (!slave) 10302b545cd8SJeremy Kerr return -ENOMEM; 10312b545cd8SJeremy Kerr 1032d1dcd678SBenjamin Herrenschmidt dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 1033d1dcd678SBenjamin Herrenschmidt slave->dev.type = &cfam_type; 10342b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 1035f6a2f8ebSJeremy Kerr slave->dev.of_node = fsi_slave_find_of_node(master, link, id); 10362b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 1037d1dcd678SBenjamin Herrenschmidt device_initialize(&slave->dev); 1038d1dcd678SBenjamin Herrenschmidt slave->cfam_id = cfam_id; 1039d1dcd678SBenjamin Herrenschmidt slave->master = master; 10402b545cd8SJeremy Kerr slave->link = link; 10412b545cd8SJeremy Kerr slave->id = id; 10422b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 1043a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = 16; 1044a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = 16; 1045a2e7da86SBenjamin Herrenschmidt 10460a213777SBenjamin Herrenschmidt /* Get chip ID if any */ 10470a213777SBenjamin Herrenschmidt slave->chip_id = -1; 10480a213777SBenjamin Herrenschmidt if (slave->dev.of_node) { 10490a213777SBenjamin Herrenschmidt uint32_t prop; 10500a213777SBenjamin Herrenschmidt if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop)) 10510a213777SBenjamin Herrenschmidt slave->chip_id = prop; 10520a213777SBenjamin Herrenschmidt 10530a213777SBenjamin Herrenschmidt } 1054d1dcd678SBenjamin Herrenschmidt 1055371975b0SJeremy Kerr rc = fsi_slave_set_smode(slave); 1056371975b0SJeremy Kerr if (rc) { 1057371975b0SJeremy Kerr dev_warn(&master->dev, 1058371975b0SJeremy Kerr "can't set smode on slave:%02x:%02x %d\n", 1059371975b0SJeremy Kerr link, id, rc); 1060371975b0SJeremy Kerr goto err_free; 1061371975b0SJeremy Kerr } 1062371975b0SJeremy Kerr 1063d1dcd678SBenjamin Herrenschmidt /* Allocate a minor in the FSI space */ 1064d1dcd678SBenjamin Herrenschmidt rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt, 1065d1dcd678SBenjamin Herrenschmidt &slave->cdev_idx); 1066d1dcd678SBenjamin Herrenschmidt if (rc) 1067d1dcd678SBenjamin Herrenschmidt goto err_free; 1068d1dcd678SBenjamin Herrenschmidt 1069d1dcd678SBenjamin Herrenschmidt /* Create chardev for userspace access */ 1070d1dcd678SBenjamin Herrenschmidt cdev_init(&slave->cdev, &cfam_fops); 1071d1dcd678SBenjamin Herrenschmidt rc = cdev_device_add(&slave->cdev, &slave->dev); 1072d1dcd678SBenjamin Herrenschmidt if (rc) { 1073d1dcd678SBenjamin Herrenschmidt dev_err(&slave->dev, "Error %d creating slave device\n", rc); 1074371975b0SJeremy Kerr goto err_free_ida; 1075d1dcd678SBenjamin Herrenschmidt } 1076d1dcd678SBenjamin Herrenschmidt 1077371975b0SJeremy Kerr /* Now that we have the cdev registered with the core, any fatal 1078371975b0SJeremy Kerr * failures beyond this point will need to clean up through 1079371975b0SJeremy Kerr * cdev_device_del(). Fortunately though, nothing past here is fatal. 1080371975b0SJeremy Kerr */ 1081371975b0SJeremy Kerr 1082a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1083a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 1084a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 1085a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 10862b545cd8SJeremy Kerr 1087d1dcd678SBenjamin Herrenschmidt /* Legacy raw file -> to be removed */ 1088125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 1089125739cbSJeremy Kerr if (rc) 1090125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 1091125739cbSJeremy Kerr 10920a213777SBenjamin Herrenschmidt 1093f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 1094f7ade2a6SJeremy Kerr if (rc) 1095f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 1096f7ade2a6SJeremy Kerr rc); 10972b545cd8SJeremy Kerr 1098371975b0SJeremy Kerr return 0; 1099d1dcd678SBenjamin Herrenschmidt 1100371975b0SJeremy Kerr err_free_ida: 1101371975b0SJeremy Kerr fsi_free_minor(slave->dev.devt); 1102d1dcd678SBenjamin Herrenschmidt err_free: 1103371975b0SJeremy Kerr of_node_put(slave->dev.of_node); 1104371975b0SJeremy Kerr kfree(slave); 1105d1dcd678SBenjamin Herrenschmidt return rc; 11062b545cd8SJeremy Kerr } 1107414c1026SJeremy Kerr 110809aecfabSJeremy Kerr /* FSI master support */ 1109014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 1110014c2abcSJeremy Kerr { 111199f039e9SEddie James if (size == 4) { 111299f039e9SEddie James if (addr & 0x3) 1113014c2abcSJeremy Kerr return -EINVAL; 111499f039e9SEddie James } else if (size == 2) { 111599f039e9SEddie James if (addr & 0x1) 111699f039e9SEddie James return -EINVAL; 111799f039e9SEddie James } else if (size != 1) 1118014c2abcSJeremy Kerr return -EINVAL; 1119014c2abcSJeremy Kerr 1120014c2abcSJeremy Kerr return 0; 1121014c2abcSJeremy Kerr } 1122014c2abcSJeremy Kerr 1123014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 1124014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 1125014c2abcSJeremy Kerr { 1126014c2abcSJeremy Kerr int rc; 1127014c2abcSJeremy Kerr 112866433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 1129014c2abcSJeremy Kerr 113066433b05SJeremy Kerr rc = fsi_check_access(addr, size); 113166433b05SJeremy Kerr if (!rc) 113266433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 113366433b05SJeremy Kerr 113466433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 113566433b05SJeremy Kerr false, val, rc); 113666433b05SJeremy Kerr 113766433b05SJeremy Kerr return rc; 1138014c2abcSJeremy Kerr } 1139014c2abcSJeremy Kerr 1140014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 1141014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 1142014c2abcSJeremy Kerr { 1143014c2abcSJeremy Kerr int rc; 1144014c2abcSJeremy Kerr 114566433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 1146014c2abcSJeremy Kerr 114766433b05SJeremy Kerr rc = fsi_check_access(addr, size); 114866433b05SJeremy Kerr if (!rc) 114966433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 115066433b05SJeremy Kerr 115166433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 115266433b05SJeremy Kerr true, val, rc); 115366433b05SJeremy Kerr 115466433b05SJeremy Kerr return rc; 1155014c2abcSJeremy Kerr } 1156014c2abcSJeremy Kerr 1157b36875a4SEddie James static int fsi_master_link_disable(struct fsi_master *master, int link) 1158b36875a4SEddie James { 1159b36875a4SEddie James if (master->link_enable) 1160b36875a4SEddie James return master->link_enable(master, link, false); 1161b36875a4SEddie James 1162b36875a4SEddie James return 0; 1163b36875a4SEddie James } 1164b36875a4SEddie James 116526095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 116626095282SChristopher Bostic { 116726095282SChristopher Bostic if (master->link_enable) 116804635a30SEddie James return master->link_enable(master, link, true); 116926095282SChristopher Bostic 117026095282SChristopher Bostic return 0; 117126095282SChristopher Bostic } 117226095282SChristopher Bostic 117326095282SChristopher Bostic /* 117426095282SChristopher Bostic * Issue a break command on this link 117526095282SChristopher Bostic */ 117626095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 117726095282SChristopher Bostic { 1178a2e7da86SBenjamin Herrenschmidt int rc = 0; 1179a2e7da86SBenjamin Herrenschmidt 118066433b05SJeremy Kerr trace_fsi_master_break(master, link); 118166433b05SJeremy Kerr 118226095282SChristopher Bostic if (master->send_break) 1183a2e7da86SBenjamin Herrenschmidt rc = master->send_break(master, link); 1184a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1185a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 16, 16); 118626095282SChristopher Bostic 1187a2e7da86SBenjamin Herrenschmidt return rc; 118826095282SChristopher Bostic } 118926095282SChristopher Bostic 1190414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 1191414c1026SJeremy Kerr { 119226095282SChristopher Bostic int link, rc; 1193414c1026SJeremy Kerr 119426095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 119526095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 119626095282SChristopher Bostic if (rc) { 119726095282SChristopher Bostic dev_dbg(&master->dev, 119826095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 119926095282SChristopher Bostic continue; 120026095282SChristopher Bostic } 120126095282SChristopher Bostic rc = fsi_master_break(master, link); 120226095282SChristopher Bostic if (rc) { 1203b36875a4SEddie James fsi_master_link_disable(master, link); 120426095282SChristopher Bostic dev_dbg(&master->dev, 120526095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 120626095282SChristopher Bostic continue; 120726095282SChristopher Bostic } 120826095282SChristopher Bostic 1209b36875a4SEddie James rc = fsi_slave_init(master, link, 0); 1210b36875a4SEddie James if (rc) 1211b36875a4SEddie James fsi_master_link_disable(master, link); 121226095282SChristopher Bostic } 1213414c1026SJeremy Kerr 1214414c1026SJeremy Kerr return 0; 1215414c1026SJeremy Kerr } 1216414c1026SJeremy Kerr 1217cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 1218cd0fdb5cSChristopher Bostic { 1219cd0fdb5cSChristopher Bostic device_unregister(dev); 1220cd0fdb5cSChristopher Bostic return 0; 1221cd0fdb5cSChristopher Bostic } 1222cd0fdb5cSChristopher Bostic 1223cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 1224cd0fdb5cSChristopher Bostic { 1225d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 1226d1dcd678SBenjamin Herrenschmidt 1227cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 1228d1dcd678SBenjamin Herrenschmidt cdev_device_del(&slave->cdev, &slave->dev); 12290ab5fe53SBenjamin Herrenschmidt put_device(dev); 1230cd0fdb5cSChristopher Bostic return 0; 1231cd0fdb5cSChristopher Bostic } 1232cd0fdb5cSChristopher Bostic 1233cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 1234cd0fdb5cSChristopher Bostic { 1235cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 1236cd0fdb5cSChristopher Bostic } 1237cd0fdb5cSChristopher Bostic 123815362d69SJeremy Kerr int fsi_master_rescan(struct fsi_master *master) 123915362d69SJeremy Kerr { 12409840fcd8SBenjamin Herrenschmidt int rc; 12419840fcd8SBenjamin Herrenschmidt 12429840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 124315362d69SJeremy Kerr fsi_master_unscan(master); 12449840fcd8SBenjamin Herrenschmidt rc = fsi_master_scan(master); 12459840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 12469840fcd8SBenjamin Herrenschmidt 12479840fcd8SBenjamin Herrenschmidt return rc; 124815362d69SJeremy Kerr } 124915362d69SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_rescan); 125015362d69SJeremy Kerr 1251cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 1252cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 1253cd0fdb5cSChristopher Bostic { 1254cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 1255cd0fdb5cSChristopher Bostic int rc; 1256cd0fdb5cSChristopher Bostic 125715362d69SJeremy Kerr rc = fsi_master_rescan(master); 1258cd0fdb5cSChristopher Bostic if (rc < 0) 1259cd0fdb5cSChristopher Bostic return rc; 1260cd0fdb5cSChristopher Bostic 1261cd0fdb5cSChristopher Bostic return count; 1262cd0fdb5cSChristopher Bostic } 1263cd0fdb5cSChristopher Bostic 1264cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 1265cd0fdb5cSChristopher Bostic 1266125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 1267125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 1268125739cbSJeremy Kerr { 1269125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 1270125739cbSJeremy Kerr 1271125739cbSJeremy Kerr fsi_master_break(master, 0); 1272125739cbSJeremy Kerr 1273125739cbSJeremy Kerr return count; 1274125739cbSJeremy Kerr } 1275125739cbSJeremy Kerr 1276125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 1277125739cbSJeremy Kerr 1278cf700ba0SJeremy Kerr static struct attribute *master_attrs[] = { 1279cf700ba0SJeremy Kerr &dev_attr_break.attr, 1280cf700ba0SJeremy Kerr &dev_attr_rescan.attr, 1281cf700ba0SJeremy Kerr NULL 1282cf700ba0SJeremy Kerr }; 1283cf700ba0SJeremy Kerr 1284cf700ba0SJeremy Kerr ATTRIBUTE_GROUPS(master); 1285cf700ba0SJeremy Kerr 128656ec311fSkbuild test robot static struct class fsi_master_class = { 12872e32c2d6SJeremy Kerr .name = "fsi-master", 1288cf700ba0SJeremy Kerr .dev_groups = master_groups, 12892e32c2d6SJeremy Kerr }; 12902e32c2d6SJeremy Kerr 129109aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 129209aecfabSJeremy Kerr { 129309aecfabSJeremy Kerr int rc; 1294f3aa2c6fSChristopher Bostic struct device_node *np; 129509aecfabSJeremy Kerr 12969840fcd8SBenjamin Herrenschmidt mutex_init(&master->scan_lock); 129709aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 129809aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 12992e32c2d6SJeremy Kerr master->dev.class = &fsi_master_class; 130009aecfabSJeremy Kerr 130109aecfabSJeremy Kerr rc = device_register(&master->dev); 1302414c1026SJeremy Kerr if (rc) { 130309aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 130409aecfabSJeremy Kerr return rc; 130509aecfabSJeremy Kerr } 1306414c1026SJeremy Kerr 1307f3aa2c6fSChristopher Bostic np = dev_of_node(&master->dev); 13089840fcd8SBenjamin Herrenschmidt if (!of_property_read_bool(np, "no-scan-on-init")) { 13099840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 1310414c1026SJeremy Kerr fsi_master_scan(master); 13119840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 13129840fcd8SBenjamin Herrenschmidt } 1313cd0fdb5cSChristopher Bostic 1314414c1026SJeremy Kerr return 0; 1315414c1026SJeremy Kerr } 131609aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 131709aecfabSJeremy Kerr 131809aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 131909aecfabSJeremy Kerr { 132009aecfabSJeremy Kerr if (master->idx >= 0) { 132109aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 132209aecfabSJeremy Kerr master->idx = -1; 132309aecfabSJeremy Kerr } 132409aecfabSJeremy Kerr 13259840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 1326cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 13279840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 132809aecfabSJeremy Kerr device_unregister(&master->dev); 132909aecfabSJeremy Kerr } 133009aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 133109aecfabSJeremy Kerr 13320508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 13330508ad1fSJeremy Kerr 1334dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 1335dd37eed7SJeremy Kerr { 1336dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 1337dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 1338dd37eed7SJeremy Kerr const struct fsi_device_id *id; 1339dd37eed7SJeremy Kerr 1340dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 1341dd37eed7SJeremy Kerr return 0; 1342dd37eed7SJeremy Kerr 1343dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 1344dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 1345dd37eed7SJeremy Kerr continue; 1346dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 1347dd37eed7SJeremy Kerr id->version == fsi_dev->version) 1348dd37eed7SJeremy Kerr return 1; 1349dd37eed7SJeremy Kerr } 1350dd37eed7SJeremy Kerr 1351dd37eed7SJeremy Kerr return 0; 1352dd37eed7SJeremy Kerr } 1353dd37eed7SJeremy Kerr 1354356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 1355356d8009SChristopher Bostic { 1356356d8009SChristopher Bostic if (!fsi_drv) 1357356d8009SChristopher Bostic return -EINVAL; 1358356d8009SChristopher Bostic if (!fsi_drv->id_table) 1359356d8009SChristopher Bostic return -EINVAL; 1360356d8009SChristopher Bostic 1361356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 1362356d8009SChristopher Bostic } 1363356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 1364356d8009SChristopher Bostic 1365356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 1366356d8009SChristopher Bostic { 1367356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 1368356d8009SChristopher Bostic } 1369356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 1370356d8009SChristopher Bostic 13710508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 13720508ad1fSJeremy Kerr .name = "fsi", 1373dd37eed7SJeremy Kerr .match = fsi_bus_match, 13740508ad1fSJeremy Kerr }; 13750508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 13760508ad1fSJeremy Kerr 1377496f8931SJoel Stanley static int __init fsi_init(void) 13780508ad1fSJeremy Kerr { 13790ab5fe53SBenjamin Herrenschmidt int rc; 13800ab5fe53SBenjamin Herrenschmidt 13810ab5fe53SBenjamin Herrenschmidt rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi"); 13820ab5fe53SBenjamin Herrenschmidt if (rc) 13830ab5fe53SBenjamin Herrenschmidt return rc; 13840ab5fe53SBenjamin Herrenschmidt rc = bus_register(&fsi_bus_type); 13850ab5fe53SBenjamin Herrenschmidt if (rc) 13860ab5fe53SBenjamin Herrenschmidt goto fail_bus; 13872e32c2d6SJeremy Kerr 13882e32c2d6SJeremy Kerr rc = class_register(&fsi_master_class); 13892e32c2d6SJeremy Kerr if (rc) 13902e32c2d6SJeremy Kerr goto fail_class; 13912e32c2d6SJeremy Kerr 13920ab5fe53SBenjamin Herrenschmidt return 0; 13930ab5fe53SBenjamin Herrenschmidt 13942e32c2d6SJeremy Kerr fail_class: 13952e32c2d6SJeremy Kerr bus_unregister(&fsi_bus_type); 13960ab5fe53SBenjamin Herrenschmidt fail_bus: 13970ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 13980ab5fe53SBenjamin Herrenschmidt return rc; 13990508ad1fSJeremy Kerr } 1400496f8931SJoel Stanley postcore_initcall(fsi_init); 14010508ad1fSJeremy Kerr 14020508ad1fSJeremy Kerr static void fsi_exit(void) 14030508ad1fSJeremy Kerr { 14042e32c2d6SJeremy Kerr class_unregister(&fsi_master_class); 14050508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 14060ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 14070ab5fe53SBenjamin Herrenschmidt ida_destroy(&fsi_minor_ida); 14080508ad1fSJeremy Kerr } 14090508ad1fSJeremy Kerr module_exit(fsi_exit); 14101fa847d7SJeremy Kerr module_param(discard_errors, int, 0664); 1411acb7e8f7SChristopher Bostic MODULE_LICENSE("GPL"); 14121fa847d7SJeremy Kerr MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); 1413