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. 14d1dcd678SBenjamin Herrenschmidt * 15d1dcd678SBenjamin Herrenschmidt * TODO: 16d1dcd678SBenjamin Herrenschmidt * - Rework topology 17d1dcd678SBenjamin Herrenschmidt * - s/chip_id/chip_loc 18d1dcd678SBenjamin Herrenschmidt * - s/cfam/chip (cfam_id -> chip_id etc...) 190508ad1fSJeremy Kerr */ 200508ad1fSJeremy Kerr 212b545cd8SJeremy Kerr #include <linux/crc4.h> 220508ad1fSJeremy Kerr #include <linux/device.h> 230508ad1fSJeremy Kerr #include <linux/fsi.h> 2409aecfabSJeremy Kerr #include <linux/idr.h> 250508ad1fSJeremy Kerr #include <linux/module.h> 26f6a2f8ebSJeremy Kerr #include <linux/of.h> 272b545cd8SJeremy Kerr #include <linux/slab.h> 28f7ade2a6SJeremy Kerr #include <linux/bitops.h> 29d1dcd678SBenjamin Herrenschmidt #include <linux/cdev.h> 30d1dcd678SBenjamin Herrenschmidt #include <linux/fs.h> 31d1dcd678SBenjamin Herrenschmidt #include <linux/uaccess.h> 320508ad1fSJeremy Kerr 3309aecfabSJeremy Kerr #include "fsi-master.h" 3409aecfabSJeremy Kerr 3566433b05SJeremy Kerr #define CREATE_TRACE_POINTS 3666433b05SJeremy Kerr #include <trace/events/fsi.h> 3766433b05SJeremy Kerr 38f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) 39f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) 40f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 41f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) 42f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_SHIFT 12 43f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) 44f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_SHIFT 4 45f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_SHIFT 4 46f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) 47f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_DATA_BITS 28 48f7ade2a6SJeremy Kerr 494efe37f4SJeremy Kerr #define FSI_PEEK_BASE 0x410 504efe37f4SJeremy Kerr 51f7ade2a6SJeremy Kerr static const int engine_page_size = 0x400; 52f7ade2a6SJeremy Kerr 532b37c3e2SChristopher Bostic #define FSI_SLAVE_BASE 0x800 542b37c3e2SChristopher Bostic 552b37c3e2SChristopher Bostic /* 562b37c3e2SChristopher Bostic * FSI slave engine control register offsets 572b37c3e2SChristopher Bostic */ 582b37c3e2SChristopher Bostic #define FSI_SMODE 0x0 /* R/W: Mode register */ 591fa847d7SJeremy Kerr #define FSI_SISC 0x8 /* R/W: Interrupt condition */ 601fa847d7SJeremy Kerr #define FSI_SSTAT 0x14 /* R : Slave status */ 614af889b0SJeremy Kerr #define FSI_LLMODE 0x100 /* R/W: Link layer mode register */ 622b37c3e2SChristopher Bostic 632b37c3e2SChristopher Bostic /* 642b37c3e2SChristopher Bostic * SMODE fields 652b37c3e2SChristopher Bostic */ 662b37c3e2SChristopher Bostic #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ 672b37c3e2SChristopher Bostic #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ 682b37c3e2SChristopher Bostic #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ 692b37c3e2SChristopher Bostic #define FSI_SMODE_SID_MASK 3 /* ID Mask */ 702b37c3e2SChristopher Bostic #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ 712b37c3e2SChristopher Bostic #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ 722b37c3e2SChristopher Bostic #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ 732b37c3e2SChristopher Bostic #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ 742b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ 752b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ 762b37c3e2SChristopher Bostic 774af889b0SJeremy Kerr /* 784af889b0SJeremy Kerr * LLMODE fields 794af889b0SJeremy Kerr */ 804af889b0SJeremy Kerr #define FSI_LLMODE_ASYNC 0x1 814af889b0SJeremy Kerr 822b545cd8SJeremy Kerr #define FSI_SLAVE_SIZE_23b 0x800000 832b545cd8SJeremy Kerr 8409aecfabSJeremy Kerr static DEFINE_IDA(master_ida); 8509aecfabSJeremy Kerr 86faf0b116SJeremy Kerr struct fsi_slave { 87faf0b116SJeremy Kerr struct device dev; 88faf0b116SJeremy Kerr struct fsi_master *master; 89d1dcd678SBenjamin Herrenschmidt struct cdev cdev; 90d1dcd678SBenjamin Herrenschmidt int cdev_idx; 91d1dcd678SBenjamin Herrenschmidt int id; /* FSI address */ 92d1dcd678SBenjamin Herrenschmidt int link; /* FSI link# */ 93d1dcd678SBenjamin Herrenschmidt u32 cfam_id; 940a213777SBenjamin Herrenschmidt int chip_id; 95faf0b116SJeremy Kerr uint32_t size; /* size of slave address space */ 96a2e7da86SBenjamin Herrenschmidt u8 t_send_delay; 97a2e7da86SBenjamin Herrenschmidt u8 t_echo_delay; 98faf0b116SJeremy Kerr }; 99faf0b116SJeremy Kerr 100cd0fdb5cSChristopher Bostic #define to_fsi_master(d) container_of(d, struct fsi_master, dev) 101faf0b116SJeremy Kerr #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) 102faf0b116SJeremy Kerr 1031fa847d7SJeremy Kerr static const int slave_retries = 2; 1041fa847d7SJeremy Kerr static int discard_errors; 1051fa847d7SJeremy Kerr 1060ab5fe53SBenjamin Herrenschmidt static dev_t fsi_base_dev; 1070ab5fe53SBenjamin Herrenschmidt static DEFINE_IDA(fsi_minor_ida); 1080ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_MAX_DEVICES 0x1000 1090ab5fe53SBenjamin Herrenschmidt 1100ab5fe53SBenjamin Herrenschmidt /* Legacy /dev numbering: 4 devices per chip, 16 chips */ 1110ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_LEGACY_TOP 64 1120ab5fe53SBenjamin Herrenschmidt 113014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 114014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 115014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 116014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 1171fa847d7SJeremy Kerr static int fsi_master_break(struct fsi_master *master, int link); 118014c2abcSJeremy Kerr 1194efe37f4SJeremy Kerr /* 1204efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 1214efe37f4SJeremy Kerr * 1224efe37f4SJeremy Kerr * FSI endpoint-device support 1234efe37f4SJeremy Kerr * 1244efe37f4SJeremy Kerr * Read / write / peek accessors for a client 1254efe37f4SJeremy Kerr * 1264efe37f4SJeremy Kerr * Parameters: 1274efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 1284efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 1294efe37f4SJeremy Kerr * plus desired offset to access its register space. 1304efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 1314efe37f4SJeremy Kerr * write this is value to write to the specified address. 1324efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 1334efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1344efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1354efe37f4SJeremy Kerr */ 1364efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1374efe37f4SJeremy Kerr size_t size) 1384efe37f4SJeremy Kerr { 1394efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1404efe37f4SJeremy Kerr return -EINVAL; 1414efe37f4SJeremy Kerr 1424efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1434efe37f4SJeremy Kerr } 1444efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1454efe37f4SJeremy Kerr 1464efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1474efe37f4SJeremy Kerr size_t size) 1484efe37f4SJeremy Kerr { 1494efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1504efe37f4SJeremy Kerr return -EINVAL; 1514efe37f4SJeremy Kerr 1524efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1534efe37f4SJeremy Kerr } 1544efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1554efe37f4SJeremy Kerr 1564efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1574efe37f4SJeremy Kerr { 1584efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1594efe37f4SJeremy Kerr 1604efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1614efe37f4SJeremy Kerr } 162f7ade2a6SJeremy Kerr 163f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 164f7ade2a6SJeremy Kerr { 165f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 166f7ade2a6SJeremy Kerr 167f6a2f8ebSJeremy Kerr of_node_put(device->dev.of_node); 168f7ade2a6SJeremy Kerr kfree(device); 169f7ade2a6SJeremy Kerr } 170f7ade2a6SJeremy Kerr 171f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 172f7ade2a6SJeremy Kerr { 173f7ade2a6SJeremy Kerr struct fsi_device *dev; 174f7ade2a6SJeremy Kerr 175f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 176f7ade2a6SJeremy Kerr if (!dev) 177f7ade2a6SJeremy Kerr return NULL; 178f7ade2a6SJeremy Kerr 179f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 180f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 181f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 182f7ade2a6SJeremy Kerr 183f7ade2a6SJeremy Kerr return dev; 184f7ade2a6SJeremy Kerr } 185f7ade2a6SJeremy Kerr 186414c1026SJeremy Kerr /* FSI slave support */ 187014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 188014c2abcSJeremy Kerr uint8_t *idp) 189014c2abcSJeremy Kerr { 190014c2abcSJeremy Kerr uint32_t addr = *addrp; 191014c2abcSJeremy Kerr uint8_t id = *idp; 192014c2abcSJeremy Kerr 193014c2abcSJeremy Kerr if (addr > slave->size) 194014c2abcSJeremy Kerr return -EINVAL; 195014c2abcSJeremy Kerr 196014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 197014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 198014c2abcSJeremy Kerr */ 199014c2abcSJeremy Kerr if (addr > 0x1fffff) { 200014c2abcSJeremy Kerr if (slave->id != 0) 201014c2abcSJeremy Kerr return -EINVAL; 202014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 203014c2abcSJeremy Kerr addr &= 0x1fffff; 204014c2abcSJeremy Kerr } 205014c2abcSJeremy Kerr 206014c2abcSJeremy Kerr *addrp = addr; 207014c2abcSJeremy Kerr *idp = id; 208014c2abcSJeremy Kerr return 0; 209014c2abcSJeremy Kerr } 210014c2abcSJeremy Kerr 211ed50a089SColin Ian King static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) 2121fa847d7SJeremy Kerr { 2131fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 21411454d6dSJoel Stanley __be32 irq, stat; 2151fa847d7SJeremy Kerr int rc, link; 2161fa847d7SJeremy Kerr uint8_t id; 2171fa847d7SJeremy Kerr 2181fa847d7SJeremy Kerr link = slave->link; 2191fa847d7SJeremy Kerr id = slave->id; 2201fa847d7SJeremy Kerr 2211fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2221fa847d7SJeremy Kerr &irq, sizeof(irq)); 2231fa847d7SJeremy Kerr if (rc) 2241fa847d7SJeremy Kerr return rc; 2251fa847d7SJeremy Kerr 2261fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, 2271fa847d7SJeremy Kerr &stat, sizeof(stat)); 2281fa847d7SJeremy Kerr if (rc) 2291fa847d7SJeremy Kerr return rc; 2301fa847d7SJeremy Kerr 231638bd9acSChristopher Bostic dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", 2321fa847d7SJeremy Kerr be32_to_cpu(stat), be32_to_cpu(irq)); 2331fa847d7SJeremy Kerr 2341fa847d7SJeremy Kerr /* clear interrupts */ 2351fa847d7SJeremy Kerr return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2361fa847d7SJeremy Kerr &irq, sizeof(irq)); 2371fa847d7SJeremy Kerr } 2381fa847d7SJeremy Kerr 239935f9636SBenjamin Herrenschmidt /* Encode slave local bus echo delay */ 240935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_echodly(int x) 241935f9636SBenjamin Herrenschmidt { 242935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 243935f9636SBenjamin Herrenschmidt } 244935f9636SBenjamin Herrenschmidt 245935f9636SBenjamin Herrenschmidt /* Encode slave local bus send delay */ 246935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_senddly(int x) 247935f9636SBenjamin Herrenschmidt { 248935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 249935f9636SBenjamin Herrenschmidt } 250935f9636SBenjamin Herrenschmidt 251935f9636SBenjamin Herrenschmidt /* Encode slave local bus clock rate ratio */ 252935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_lbcrr(int x) 253935f9636SBenjamin Herrenschmidt { 254935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 255935f9636SBenjamin Herrenschmidt } 256935f9636SBenjamin Herrenschmidt 257935f9636SBenjamin Herrenschmidt /* Encode slave ID */ 258935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_sid(int x) 259935f9636SBenjamin Herrenschmidt { 260935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 261935f9636SBenjamin Herrenschmidt } 262935f9636SBenjamin Herrenschmidt 263a2e7da86SBenjamin Herrenschmidt static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly) 264935f9636SBenjamin Herrenschmidt { 265935f9636SBenjamin Herrenschmidt return FSI_SMODE_WSC | FSI_SMODE_ECRC 266935f9636SBenjamin Herrenschmidt | fsi_smode_sid(id) 267a2e7da86SBenjamin Herrenschmidt | fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1) 268935f9636SBenjamin Herrenschmidt | fsi_smode_lbcrr(0x8); 269935f9636SBenjamin Herrenschmidt } 270935f9636SBenjamin Herrenschmidt 271a2e7da86SBenjamin Herrenschmidt static int fsi_slave_set_smode(struct fsi_slave *slave) 272935f9636SBenjamin Herrenschmidt { 273935f9636SBenjamin Herrenschmidt uint32_t smode; 274935f9636SBenjamin Herrenschmidt __be32 data; 275935f9636SBenjamin Herrenschmidt 276935f9636SBenjamin Herrenschmidt /* set our smode register with the slave ID field to 0; this enables 277935f9636SBenjamin Herrenschmidt * extended slave addressing 278935f9636SBenjamin Herrenschmidt */ 279a2e7da86SBenjamin Herrenschmidt smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay); 280935f9636SBenjamin Herrenschmidt data = cpu_to_be32(smode); 281935f9636SBenjamin Herrenschmidt 282a2e7da86SBenjamin Herrenschmidt return fsi_master_write(slave->master, slave->link, slave->id, 283a2e7da86SBenjamin Herrenschmidt FSI_SLAVE_BASE + FSI_SMODE, 284935f9636SBenjamin Herrenschmidt &data, sizeof(data)); 285935f9636SBenjamin Herrenschmidt } 2861fa847d7SJeremy Kerr 287ed50a089SColin Ian King static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, 288ed50a089SColin Ian King uint32_t addr, size_t size) 2891fa847d7SJeremy Kerr { 2901fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 2911fa847d7SJeremy Kerr int rc, link; 2921fa847d7SJeremy Kerr uint32_t reg; 293a2e7da86SBenjamin Herrenschmidt uint8_t id, send_delay, echo_delay; 2941fa847d7SJeremy Kerr 2951fa847d7SJeremy Kerr if (discard_errors) 2961fa847d7SJeremy Kerr return -1; 2971fa847d7SJeremy Kerr 2981fa847d7SJeremy Kerr link = slave->link; 2991fa847d7SJeremy Kerr id = slave->id; 3001fa847d7SJeremy Kerr 3011fa847d7SJeremy Kerr dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", 3021fa847d7SJeremy Kerr write ? "write" : "read", addr, size); 3031fa847d7SJeremy Kerr 3041fa847d7SJeremy Kerr /* try a simple clear of error conditions, which may fail if we've lost 3051fa847d7SJeremy Kerr * communication with the slave 3061fa847d7SJeremy Kerr */ 3071fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 3081fa847d7SJeremy Kerr if (!rc) 3091fa847d7SJeremy Kerr return 0; 3101fa847d7SJeremy Kerr 3111fa847d7SJeremy Kerr /* send a TERM and retry */ 3121fa847d7SJeremy Kerr if (master->term) { 3131fa847d7SJeremy Kerr rc = master->term(master, link, id); 3141fa847d7SJeremy Kerr if (!rc) { 3151fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, 0, 3161fa847d7SJeremy Kerr ®, sizeof(reg)); 3171fa847d7SJeremy Kerr if (!rc) 3181fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 3191fa847d7SJeremy Kerr if (!rc) 3201fa847d7SJeremy Kerr return 0; 3211fa847d7SJeremy Kerr } 3221fa847d7SJeremy Kerr } 3231fa847d7SJeremy Kerr 324a2e7da86SBenjamin Herrenschmidt send_delay = slave->t_send_delay; 325a2e7da86SBenjamin Herrenschmidt echo_delay = slave->t_echo_delay; 326a2e7da86SBenjamin Herrenschmidt 3271fa847d7SJeremy Kerr /* getting serious, reset the slave via BREAK */ 3281fa847d7SJeremy Kerr rc = fsi_master_break(master, link); 3291fa847d7SJeremy Kerr if (rc) 3301fa847d7SJeremy Kerr return rc; 3311fa847d7SJeremy Kerr 332a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = send_delay; 333a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = echo_delay; 334a2e7da86SBenjamin Herrenschmidt 335a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 3361fa847d7SJeremy Kerr if (rc) 3371fa847d7SJeremy Kerr return rc; 3381fa847d7SJeremy Kerr 339a2e7da86SBenjamin Herrenschmidt if (master->link_config) 340a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 341a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 342a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 343a2e7da86SBenjamin Herrenschmidt 3441fa847d7SJeremy Kerr return fsi_slave_report_and_clear_errors(slave); 3451fa847d7SJeremy Kerr } 3461fa847d7SJeremy Kerr 347da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 348014c2abcSJeremy Kerr void *val, size_t size) 349014c2abcSJeremy Kerr { 350014c2abcSJeremy Kerr uint8_t id = slave->id; 3511fa847d7SJeremy Kerr int rc, err_rc, i; 352014c2abcSJeremy Kerr 353014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 354014c2abcSJeremy Kerr if (rc) 355014c2abcSJeremy Kerr return rc; 356014c2abcSJeremy Kerr 3571fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3581fa847d7SJeremy Kerr rc = fsi_master_read(slave->master, slave->link, 3591fa847d7SJeremy Kerr id, addr, val, size); 3601fa847d7SJeremy Kerr if (!rc) 3611fa847d7SJeremy Kerr break; 3621fa847d7SJeremy Kerr 3631fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, false, addr, size); 3641fa847d7SJeremy Kerr if (err_rc) 3651fa847d7SJeremy Kerr break; 3661fa847d7SJeremy Kerr } 3671fa847d7SJeremy Kerr 3681fa847d7SJeremy Kerr return rc; 369014c2abcSJeremy Kerr } 370da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 371014c2abcSJeremy Kerr 372da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 373014c2abcSJeremy Kerr const void *val, size_t size) 374014c2abcSJeremy Kerr { 375014c2abcSJeremy Kerr uint8_t id = slave->id; 3761fa847d7SJeremy Kerr int rc, err_rc, i; 377014c2abcSJeremy Kerr 378014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 379014c2abcSJeremy Kerr if (rc) 380014c2abcSJeremy Kerr return rc; 381014c2abcSJeremy Kerr 3821fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3831fa847d7SJeremy Kerr rc = fsi_master_write(slave->master, slave->link, 3841fa847d7SJeremy Kerr id, addr, val, size); 3851fa847d7SJeremy Kerr if (!rc) 3861fa847d7SJeremy Kerr break; 3871fa847d7SJeremy Kerr 3881fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, true, addr, size); 3891fa847d7SJeremy Kerr if (err_rc) 3901fa847d7SJeremy Kerr break; 3911fa847d7SJeremy Kerr } 3921fa847d7SJeremy Kerr 3931fa847d7SJeremy Kerr return rc; 394014c2abcSJeremy Kerr } 395da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 396da36cadfSJeremy Kerr 397da36cadfSJeremy Kerr extern int fsi_slave_claim_range(struct fsi_slave *slave, 398da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 399da36cadfSJeremy Kerr { 400da36cadfSJeremy Kerr if (addr + size < addr) 401da36cadfSJeremy Kerr return -EINVAL; 402da36cadfSJeremy Kerr 403da36cadfSJeremy Kerr if (addr + size > slave->size) 404da36cadfSJeremy Kerr return -EINVAL; 405da36cadfSJeremy Kerr 406da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 407da36cadfSJeremy Kerr return 0; 408da36cadfSJeremy Kerr } 409da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 410da36cadfSJeremy Kerr 411da36cadfSJeremy Kerr extern void fsi_slave_release_range(struct fsi_slave *slave, 412da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 413da36cadfSJeremy Kerr { 414da36cadfSJeremy Kerr } 415da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 416014c2abcSJeremy Kerr 417f6a2f8ebSJeremy Kerr static bool fsi_device_node_matches(struct device *dev, struct device_node *np, 418f6a2f8ebSJeremy Kerr uint32_t addr, uint32_t size) 419f6a2f8ebSJeremy Kerr { 420f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 421f6a2f8ebSJeremy Kerr const __be32 *prop; 422f6a2f8ebSJeremy Kerr uint32_t psize; 423f6a2f8ebSJeremy Kerr 424f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 425f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 426f6a2f8ebSJeremy Kerr 427f6a2f8ebSJeremy Kerr if (na != 1 || ns != 1) 428f6a2f8ebSJeremy Kerr return false; 429f6a2f8ebSJeremy Kerr 430f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 431f6a2f8ebSJeremy Kerr if (!prop || len != 8) 432f6a2f8ebSJeremy Kerr return false; 433f6a2f8ebSJeremy Kerr 434f6a2f8ebSJeremy Kerr if (of_read_number(prop, 1) != addr) 435f6a2f8ebSJeremy Kerr return false; 436f6a2f8ebSJeremy Kerr 437f6a2f8ebSJeremy Kerr psize = of_read_number(prop + 1, 1); 438f6a2f8ebSJeremy Kerr if (psize != size) { 439f6a2f8ebSJeremy Kerr dev_warn(dev, 440f6a2f8ebSJeremy Kerr "node %s matches probed address, but not size (got 0x%x, expected 0x%x)", 441f6a2f8ebSJeremy Kerr of_node_full_name(np), psize, size); 442f6a2f8ebSJeremy Kerr } 443f6a2f8ebSJeremy Kerr 444f6a2f8ebSJeremy Kerr return true; 445f6a2f8ebSJeremy Kerr } 446f6a2f8ebSJeremy Kerr 447f6a2f8ebSJeremy Kerr /* Find a matching node for the slave engine at @address, using @size bytes 448f6a2f8ebSJeremy Kerr * of space. Returns NULL if not found, or a matching node with refcount 449f6a2f8ebSJeremy Kerr * already incremented. 450f6a2f8ebSJeremy Kerr */ 451f6a2f8ebSJeremy Kerr static struct device_node *fsi_device_find_of_node(struct fsi_device *dev) 452f6a2f8ebSJeremy Kerr { 453f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 454f6a2f8ebSJeremy Kerr 455f6a2f8ebSJeremy Kerr parent = dev_of_node(&dev->slave->dev); 456f6a2f8ebSJeremy Kerr if (!parent) 457f6a2f8ebSJeremy Kerr return NULL; 458f6a2f8ebSJeremy Kerr 459f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 460f6a2f8ebSJeremy Kerr if (fsi_device_node_matches(&dev->dev, np, 461f6a2f8ebSJeremy Kerr dev->addr, dev->size)) 462f6a2f8ebSJeremy Kerr return np; 463f6a2f8ebSJeremy Kerr } 464f6a2f8ebSJeremy Kerr 465f6a2f8ebSJeremy Kerr return NULL; 466f6a2f8ebSJeremy Kerr } 467f6a2f8ebSJeremy Kerr 468f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 469f7ade2a6SJeremy Kerr { 470f7ade2a6SJeremy Kerr uint32_t engine_addr; 471f7ade2a6SJeremy Kerr int rc, i; 472f7ade2a6SJeremy Kerr 473f7ade2a6SJeremy Kerr /* 474f7ade2a6SJeremy Kerr * scan engines 475f7ade2a6SJeremy Kerr * 476f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 477f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 478f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 479f7ade2a6SJeremy Kerr */ 480f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 481f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 482f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 483f7ade2a6SJeremy Kerr struct fsi_device *dev; 48411454d6dSJoel Stanley uint32_t conf; 48511454d6dSJoel Stanley __be32 data; 486f7ade2a6SJeremy Kerr 48711454d6dSJoel Stanley rc = fsi_slave_read(slave, (i + 1) * sizeof(data), 48811454d6dSJoel Stanley &data, sizeof(data)); 489f7ade2a6SJeremy Kerr if (rc) { 490f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 491f7ade2a6SJeremy Kerr "error reading slave registers\n"); 492f7ade2a6SJeremy Kerr return -1; 493f7ade2a6SJeremy Kerr } 49411454d6dSJoel Stanley conf = be32_to_cpu(data); 495f7ade2a6SJeremy Kerr 496f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 497f7ade2a6SJeremy Kerr if (crc) { 498f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 499f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 500f7ade2a6SJeremy Kerr i); 501f7ade2a6SJeremy Kerr return -1; 502f7ade2a6SJeremy Kerr } 503f7ade2a6SJeremy Kerr 504f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 505f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 506f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 507f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 508f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 509f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 510f7ade2a6SJeremy Kerr 511f7ade2a6SJeremy Kerr /* 512f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 513f7ade2a6SJeremy Kerr * skips the defined address areas 514f7ade2a6SJeremy Kerr */ 515f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 516f7ade2a6SJeremy Kerr 517f7ade2a6SJeremy Kerr /* create device */ 518f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 519f7ade2a6SJeremy Kerr if (!dev) 520f7ade2a6SJeremy Kerr return -ENOMEM; 521f7ade2a6SJeremy Kerr 522f7ade2a6SJeremy Kerr dev->slave = slave; 523f7ade2a6SJeremy Kerr dev->engine_type = type; 524f7ade2a6SJeremy Kerr dev->version = version; 525f7ade2a6SJeremy Kerr dev->unit = i; 526f7ade2a6SJeremy Kerr dev->addr = engine_addr; 527f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 528f7ade2a6SJeremy Kerr 529f7ade2a6SJeremy Kerr dev_dbg(&slave->dev, 530f7ade2a6SJeremy Kerr "engine[%i]: type %x, version %x, addr %x size %x\n", 531f7ade2a6SJeremy Kerr dev->unit, dev->engine_type, version, 532f7ade2a6SJeremy Kerr dev->addr, dev->size); 533f7ade2a6SJeremy Kerr 534f7ade2a6SJeremy Kerr dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", 535f7ade2a6SJeremy Kerr slave->master->idx, slave->link, 536f7ade2a6SJeremy Kerr slave->id, i - 2); 537f6a2f8ebSJeremy Kerr dev->dev.of_node = fsi_device_find_of_node(dev); 538f7ade2a6SJeremy Kerr 539f7ade2a6SJeremy Kerr rc = device_register(&dev->dev); 540f7ade2a6SJeremy Kerr if (rc) { 541f7ade2a6SJeremy Kerr dev_warn(&slave->dev, "add failed: %d\n", rc); 542f7ade2a6SJeremy Kerr put_device(&dev->dev); 543f7ade2a6SJeremy Kerr } 544f7ade2a6SJeremy Kerr } 545f7ade2a6SJeremy Kerr 546f7ade2a6SJeremy Kerr engine_addr += slots * engine_page_size; 547f7ade2a6SJeremy Kerr 548f7ade2a6SJeremy Kerr if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) 549f7ade2a6SJeremy Kerr break; 550f7ade2a6SJeremy Kerr } 551f7ade2a6SJeremy Kerr 552f7ade2a6SJeremy Kerr return 0; 553f7ade2a6SJeremy Kerr } 554f7ade2a6SJeremy Kerr 555125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 556125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 557125739cbSJeremy Kerr loff_t off, size_t count) 558125739cbSJeremy Kerr { 559125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 560125739cbSJeremy Kerr size_t total_len, read_len; 561125739cbSJeremy Kerr int rc; 562125739cbSJeremy Kerr 563125739cbSJeremy Kerr if (off < 0) 564125739cbSJeremy Kerr return -EINVAL; 565125739cbSJeremy Kerr 566125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 567125739cbSJeremy Kerr return -EINVAL; 568125739cbSJeremy Kerr 569125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += read_len) { 570125739cbSJeremy Kerr read_len = min_t(size_t, count, 4); 571125739cbSJeremy Kerr read_len -= off & 0x3; 572125739cbSJeremy Kerr 573125739cbSJeremy Kerr rc = fsi_slave_read(slave, off, buf + total_len, read_len); 574125739cbSJeremy Kerr if (rc) 575125739cbSJeremy Kerr return rc; 576125739cbSJeremy Kerr 577125739cbSJeremy Kerr off += read_len; 578125739cbSJeremy Kerr } 579125739cbSJeremy Kerr 580125739cbSJeremy Kerr return count; 581125739cbSJeremy Kerr } 582125739cbSJeremy Kerr 583125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_write(struct file *file, 584125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 585125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 586125739cbSJeremy Kerr { 587125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 588125739cbSJeremy Kerr size_t total_len, write_len; 589125739cbSJeremy Kerr int rc; 590125739cbSJeremy Kerr 591125739cbSJeremy Kerr if (off < 0) 592125739cbSJeremy Kerr return -EINVAL; 593125739cbSJeremy Kerr 594125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 595125739cbSJeremy Kerr return -EINVAL; 596125739cbSJeremy Kerr 597125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += write_len) { 598125739cbSJeremy Kerr write_len = min_t(size_t, count, 4); 599125739cbSJeremy Kerr write_len -= off & 0x3; 600125739cbSJeremy Kerr 601125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 602125739cbSJeremy Kerr if (rc) 603125739cbSJeremy Kerr return rc; 604125739cbSJeremy Kerr 605125739cbSJeremy Kerr off += write_len; 606125739cbSJeremy Kerr } 607125739cbSJeremy Kerr 608125739cbSJeremy Kerr return count; 609125739cbSJeremy Kerr } 610125739cbSJeremy Kerr 611061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_raw_attr = { 612125739cbSJeremy Kerr .attr = { 613125739cbSJeremy Kerr .name = "raw", 614125739cbSJeremy Kerr .mode = 0600, 615125739cbSJeremy Kerr }, 616125739cbSJeremy Kerr .size = 0, 617125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 618125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 619125739cbSJeremy Kerr }; 620125739cbSJeremy Kerr 6212b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 6222b545cd8SJeremy Kerr { 6232b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 6242b545cd8SJeremy Kerr 6250ab5fe53SBenjamin Herrenschmidt fsi_free_minor(slave->dev.devt); 626f6a2f8ebSJeremy Kerr of_node_put(dev->of_node); 6272b545cd8SJeremy Kerr kfree(slave); 6282b545cd8SJeremy Kerr } 6292b545cd8SJeremy Kerr 630f6a2f8ebSJeremy Kerr static bool fsi_slave_node_matches(struct device_node *np, 631f6a2f8ebSJeremy Kerr int link, uint8_t id) 632f6a2f8ebSJeremy Kerr { 633f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 634f6a2f8ebSJeremy Kerr const __be32 *prop; 635f6a2f8ebSJeremy Kerr 636f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 637f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 638f6a2f8ebSJeremy Kerr 639f6a2f8ebSJeremy Kerr /* Ensure we have the correct format for addresses and sizes in 640f6a2f8ebSJeremy Kerr * reg properties 641f6a2f8ebSJeremy Kerr */ 642f6a2f8ebSJeremy Kerr if (na != 2 || ns != 0) 643f6a2f8ebSJeremy Kerr return false; 644f6a2f8ebSJeremy Kerr 645f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 646f6a2f8ebSJeremy Kerr if (!prop || len != 8) 647f6a2f8ebSJeremy Kerr return false; 648f6a2f8ebSJeremy Kerr 649f6a2f8ebSJeremy Kerr return (of_read_number(prop, 1) == link) && 650f6a2f8ebSJeremy Kerr (of_read_number(prop + 1, 1) == id); 651f6a2f8ebSJeremy Kerr } 652f6a2f8ebSJeremy Kerr 653f6a2f8ebSJeremy Kerr /* Find a matching node for the slave at (link, id). Returns NULL if none 654f6a2f8ebSJeremy Kerr * found, or a matching node with refcount already incremented. 655f6a2f8ebSJeremy Kerr */ 656f6a2f8ebSJeremy Kerr static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, 657f6a2f8ebSJeremy Kerr int link, uint8_t id) 658f6a2f8ebSJeremy Kerr { 659f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 660f6a2f8ebSJeremy Kerr 661f6a2f8ebSJeremy Kerr parent = dev_of_node(&master->dev); 662f6a2f8ebSJeremy Kerr if (!parent) 663f6a2f8ebSJeremy Kerr return NULL; 664f6a2f8ebSJeremy Kerr 665f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 666f6a2f8ebSJeremy Kerr if (fsi_slave_node_matches(np, link, id)) 667f6a2f8ebSJeremy Kerr return np; 668f6a2f8ebSJeremy Kerr } 669f6a2f8ebSJeremy Kerr 670f6a2f8ebSJeremy Kerr return NULL; 671f6a2f8ebSJeremy Kerr } 672f6a2f8ebSJeremy Kerr 673d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count, 674d1dcd678SBenjamin Herrenschmidt loff_t *offset) 675d1dcd678SBenjamin Herrenschmidt { 676d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 677d1dcd678SBenjamin Herrenschmidt size_t total_len, read_len; 678d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 679d1dcd678SBenjamin Herrenschmidt ssize_t rc; 680d1dcd678SBenjamin Herrenschmidt 681d1dcd678SBenjamin Herrenschmidt if (off < 0) 682d1dcd678SBenjamin Herrenschmidt return -EINVAL; 683d1dcd678SBenjamin Herrenschmidt 684d1dcd678SBenjamin Herrenschmidt if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 685d1dcd678SBenjamin Herrenschmidt return -EINVAL; 686d1dcd678SBenjamin Herrenschmidt 687d1dcd678SBenjamin Herrenschmidt for (total_len = 0; total_len < count; total_len += read_len) { 688d1dcd678SBenjamin Herrenschmidt __be32 data; 689d1dcd678SBenjamin Herrenschmidt 690d1dcd678SBenjamin Herrenschmidt read_len = min_t(size_t, count, 4); 691d1dcd678SBenjamin Herrenschmidt read_len -= off & 0x3; 692d1dcd678SBenjamin Herrenschmidt 693d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_read(slave, off, &data, read_len); 694d1dcd678SBenjamin Herrenschmidt if (rc) 695d1dcd678SBenjamin Herrenschmidt goto fail; 696d1dcd678SBenjamin Herrenschmidt rc = copy_to_user(buf + total_len, &data, read_len); 697d1dcd678SBenjamin Herrenschmidt if (rc) { 698d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 699d1dcd678SBenjamin Herrenschmidt goto fail; 700d1dcd678SBenjamin Herrenschmidt } 701d1dcd678SBenjamin Herrenschmidt off += read_len; 702d1dcd678SBenjamin Herrenschmidt } 703d1dcd678SBenjamin Herrenschmidt rc = count; 704d1dcd678SBenjamin Herrenschmidt fail: 705d1dcd678SBenjamin Herrenschmidt *offset = off; 706d1dcd678SBenjamin Herrenschmidt return count; 707d1dcd678SBenjamin Herrenschmidt } 708d1dcd678SBenjamin Herrenschmidt 709d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_write(struct file *filep, const char __user *buf, 710d1dcd678SBenjamin Herrenschmidt size_t count, loff_t *offset) 711d1dcd678SBenjamin Herrenschmidt { 712d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 713d1dcd678SBenjamin Herrenschmidt size_t total_len, write_len; 714d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 715d1dcd678SBenjamin Herrenschmidt ssize_t rc; 716d1dcd678SBenjamin Herrenschmidt 717d1dcd678SBenjamin Herrenschmidt 718d1dcd678SBenjamin Herrenschmidt if (off < 0) 719d1dcd678SBenjamin Herrenschmidt return -EINVAL; 720d1dcd678SBenjamin Herrenschmidt 721d1dcd678SBenjamin Herrenschmidt if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 722d1dcd678SBenjamin Herrenschmidt return -EINVAL; 723d1dcd678SBenjamin Herrenschmidt 724d1dcd678SBenjamin Herrenschmidt for (total_len = 0; total_len < count; total_len += write_len) { 725d1dcd678SBenjamin Herrenschmidt __be32 data; 726d1dcd678SBenjamin Herrenschmidt 727d1dcd678SBenjamin Herrenschmidt write_len = min_t(size_t, count, 4); 728d1dcd678SBenjamin Herrenschmidt write_len -= off & 0x3; 729d1dcd678SBenjamin Herrenschmidt 730d1dcd678SBenjamin Herrenschmidt rc = copy_from_user(&data, buf + total_len, write_len); 731d1dcd678SBenjamin Herrenschmidt if (rc) { 732d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 733d1dcd678SBenjamin Herrenschmidt goto fail; 734d1dcd678SBenjamin Herrenschmidt } 735d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_write(slave, off, &data, write_len); 736d1dcd678SBenjamin Herrenschmidt if (rc) 737d1dcd678SBenjamin Herrenschmidt goto fail; 738d1dcd678SBenjamin Herrenschmidt off += write_len; 739d1dcd678SBenjamin Herrenschmidt } 740d1dcd678SBenjamin Herrenschmidt rc = count; 741d1dcd678SBenjamin Herrenschmidt fail: 742d1dcd678SBenjamin Herrenschmidt *offset = off; 743d1dcd678SBenjamin Herrenschmidt return count; 744d1dcd678SBenjamin Herrenschmidt } 745d1dcd678SBenjamin Herrenschmidt 746d1dcd678SBenjamin Herrenschmidt static loff_t cfam_llseek(struct file *file, loff_t offset, int whence) 747d1dcd678SBenjamin Herrenschmidt { 748d1dcd678SBenjamin Herrenschmidt switch (whence) { 749d1dcd678SBenjamin Herrenschmidt case SEEK_CUR: 750d1dcd678SBenjamin Herrenschmidt break; 751d1dcd678SBenjamin Herrenschmidt case SEEK_SET: 752d1dcd678SBenjamin Herrenschmidt file->f_pos = offset; 753d1dcd678SBenjamin Herrenschmidt break; 754d1dcd678SBenjamin Herrenschmidt default: 755d1dcd678SBenjamin Herrenschmidt return -EINVAL; 756d1dcd678SBenjamin Herrenschmidt } 757d1dcd678SBenjamin Herrenschmidt 758d1dcd678SBenjamin Herrenschmidt return offset; 759d1dcd678SBenjamin Herrenschmidt } 760d1dcd678SBenjamin Herrenschmidt 761d1dcd678SBenjamin Herrenschmidt static int cfam_open(struct inode *inode, struct file *file) 762d1dcd678SBenjamin Herrenschmidt { 763d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev); 764d1dcd678SBenjamin Herrenschmidt 765d1dcd678SBenjamin Herrenschmidt file->private_data = slave; 766d1dcd678SBenjamin Herrenschmidt 767d1dcd678SBenjamin Herrenschmidt return 0; 768d1dcd678SBenjamin Herrenschmidt } 769d1dcd678SBenjamin Herrenschmidt 770d1dcd678SBenjamin Herrenschmidt static const struct file_operations cfam_fops = { 771d1dcd678SBenjamin Herrenschmidt .owner = THIS_MODULE, 772d1dcd678SBenjamin Herrenschmidt .open = cfam_open, 773d1dcd678SBenjamin Herrenschmidt .llseek = cfam_llseek, 774d1dcd678SBenjamin Herrenschmidt .read = cfam_read, 775d1dcd678SBenjamin Herrenschmidt .write = cfam_write, 776d1dcd678SBenjamin Herrenschmidt }; 777d1dcd678SBenjamin Herrenschmidt 778d1dcd678SBenjamin Herrenschmidt static ssize_t send_term_store(struct device *dev, 779d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 780d1dcd678SBenjamin Herrenschmidt const char *buf, size_t count) 781d1dcd678SBenjamin Herrenschmidt { 782d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 783d1dcd678SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 784d1dcd678SBenjamin Herrenschmidt 785d1dcd678SBenjamin Herrenschmidt if (!master->term) 786d1dcd678SBenjamin Herrenschmidt return -ENODEV; 787d1dcd678SBenjamin Herrenschmidt 788d1dcd678SBenjamin Herrenschmidt master->term(master, slave->link, slave->id); 789d1dcd678SBenjamin Herrenschmidt return count; 790d1dcd678SBenjamin Herrenschmidt } 791d1dcd678SBenjamin Herrenschmidt 792d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_WO(send_term); 793d1dcd678SBenjamin Herrenschmidt 794a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_show(struct device *dev, 795a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, 796a2e7da86SBenjamin Herrenschmidt char *buf) 797a2e7da86SBenjamin Herrenschmidt { 798a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 799a2e7da86SBenjamin Herrenschmidt 800a2e7da86SBenjamin Herrenschmidt return sprintf(buf, "%u\n", slave->t_send_delay); 801a2e7da86SBenjamin Herrenschmidt } 802a2e7da86SBenjamin Herrenschmidt 803a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_store(struct device *dev, 804a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, const char *buf, size_t count) 805a2e7da86SBenjamin Herrenschmidt { 806a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 807a2e7da86SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 808a2e7da86SBenjamin Herrenschmidt unsigned long val; 809a2e7da86SBenjamin Herrenschmidt int rc; 810a2e7da86SBenjamin Herrenschmidt 811a2e7da86SBenjamin Herrenschmidt if (kstrtoul(buf, 0, &val) < 0) 812a2e7da86SBenjamin Herrenschmidt return -EINVAL; 813a2e7da86SBenjamin Herrenschmidt 814a2e7da86SBenjamin Herrenschmidt if (val < 1 || val > 16) 815a2e7da86SBenjamin Herrenschmidt return -EINVAL; 816a2e7da86SBenjamin Herrenschmidt 817a2e7da86SBenjamin Herrenschmidt if (!master->link_config) 818a2e7da86SBenjamin Herrenschmidt return -ENXIO; 819a2e7da86SBenjamin Herrenschmidt 820a2e7da86SBenjamin Herrenschmidt /* Current HW mandates that send and echo delay are identical */ 821a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = val; 822a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = val; 823a2e7da86SBenjamin Herrenschmidt 824a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 825a2e7da86SBenjamin Herrenschmidt if (rc < 0) 826a2e7da86SBenjamin Herrenschmidt return rc; 827a2e7da86SBenjamin Herrenschmidt if (master->link_config) 828a2e7da86SBenjamin Herrenschmidt master->link_config(master, slave->link, 829a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 830a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 831a2e7da86SBenjamin Herrenschmidt 832a2e7da86SBenjamin Herrenschmidt return count; 833a2e7da86SBenjamin Herrenschmidt } 834a2e7da86SBenjamin Herrenschmidt 835a2e7da86SBenjamin Herrenschmidt static DEVICE_ATTR(send_echo_delays, 0600, 836a2e7da86SBenjamin Herrenschmidt slave_send_echo_show, slave_send_echo_store); 837a2e7da86SBenjamin Herrenschmidt 8380a213777SBenjamin Herrenschmidt static ssize_t chip_id_show(struct device *dev, 8390a213777SBenjamin Herrenschmidt struct device_attribute *attr, 8400a213777SBenjamin Herrenschmidt char *buf) 8410a213777SBenjamin Herrenschmidt { 8420a213777SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 8430a213777SBenjamin Herrenschmidt 8440a213777SBenjamin Herrenschmidt return sprintf(buf, "%d\n", slave->chip_id); 8450a213777SBenjamin Herrenschmidt } 8460a213777SBenjamin Herrenschmidt 8470a213777SBenjamin Herrenschmidt static DEVICE_ATTR_RO(chip_id); 8480a213777SBenjamin Herrenschmidt 849d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_id_show(struct device *dev, 850d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 851d1dcd678SBenjamin Herrenschmidt char *buf) 852d1dcd678SBenjamin Herrenschmidt { 853d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 854d1dcd678SBenjamin Herrenschmidt 855d1dcd678SBenjamin Herrenschmidt return sprintf(buf, "0x%x\n", slave->cfam_id); 856d1dcd678SBenjamin Herrenschmidt } 857d1dcd678SBenjamin Herrenschmidt 858d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_RO(cfam_id); 859d1dcd678SBenjamin Herrenschmidt 860d1dcd678SBenjamin Herrenschmidt static struct attribute *cfam_attr[] = { 861d1dcd678SBenjamin Herrenschmidt &dev_attr_send_echo_delays.attr, 862d1dcd678SBenjamin Herrenschmidt &dev_attr_chip_id.attr, 863d1dcd678SBenjamin Herrenschmidt &dev_attr_cfam_id.attr, 864d1dcd678SBenjamin Herrenschmidt &dev_attr_send_term.attr, 865d1dcd678SBenjamin Herrenschmidt NULL, 866d1dcd678SBenjamin Herrenschmidt }; 867d1dcd678SBenjamin Herrenschmidt 868d1dcd678SBenjamin Herrenschmidt static const struct attribute_group cfam_attr_group = { 869d1dcd678SBenjamin Herrenschmidt .attrs = cfam_attr, 870d1dcd678SBenjamin Herrenschmidt }; 871d1dcd678SBenjamin Herrenschmidt 872d1dcd678SBenjamin Herrenschmidt static const struct attribute_group *cfam_attr_groups[] = { 873d1dcd678SBenjamin Herrenschmidt &cfam_attr_group, 874d1dcd678SBenjamin Herrenschmidt NULL, 875d1dcd678SBenjamin Herrenschmidt }; 876d1dcd678SBenjamin Herrenschmidt 877d1dcd678SBenjamin Herrenschmidt static char *cfam_devnode(struct device *dev, umode_t *mode, 878d1dcd678SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 879d1dcd678SBenjamin Herrenschmidt { 880d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 881d1dcd678SBenjamin Herrenschmidt 882d1dcd678SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 883d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx); 884d1dcd678SBenjamin Herrenschmidt #else 885d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx); 886d1dcd678SBenjamin Herrenschmidt #endif 887d1dcd678SBenjamin Herrenschmidt } 888d1dcd678SBenjamin Herrenschmidt 889d1dcd678SBenjamin Herrenschmidt static const struct device_type cfam_type = { 890d1dcd678SBenjamin Herrenschmidt .name = "cfam", 891d1dcd678SBenjamin Herrenschmidt .devnode = cfam_devnode, 892d1dcd678SBenjamin Herrenschmidt .groups = cfam_attr_groups 893d1dcd678SBenjamin Herrenschmidt }; 894d1dcd678SBenjamin Herrenschmidt 8950ab5fe53SBenjamin Herrenschmidt static char *fsi_cdev_devnode(struct device *dev, umode_t *mode, 8960ab5fe53SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 8970ab5fe53SBenjamin Herrenschmidt { 8980ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 8990ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev)); 9000ab5fe53SBenjamin Herrenschmidt #else 9010ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 9020ab5fe53SBenjamin Herrenschmidt #endif 9030ab5fe53SBenjamin Herrenschmidt } 9040ab5fe53SBenjamin Herrenschmidt 9050ab5fe53SBenjamin Herrenschmidt const struct device_type fsi_cdev_type = { 9060ab5fe53SBenjamin Herrenschmidt .name = "fsi-cdev", 9070ab5fe53SBenjamin Herrenschmidt .devnode = fsi_cdev_devnode, 9080ab5fe53SBenjamin Herrenschmidt }; 9090ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_cdev_type); 9100ab5fe53SBenjamin Herrenschmidt 9110ab5fe53SBenjamin Herrenschmidt /* Backward compatible /dev/ numbering in "old style" mode */ 9120ab5fe53SBenjamin Herrenschmidt static int fsi_adjust_index(int index) 9130ab5fe53SBenjamin Herrenschmidt { 9140ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 9150ab5fe53SBenjamin Herrenschmidt return index; 9160ab5fe53SBenjamin Herrenschmidt #else 9170ab5fe53SBenjamin Herrenschmidt return index + 1; 9180ab5fe53SBenjamin Herrenschmidt #endif 9190ab5fe53SBenjamin Herrenschmidt } 9200ab5fe53SBenjamin Herrenschmidt 9210ab5fe53SBenjamin Herrenschmidt static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type, 9220ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9230ab5fe53SBenjamin Herrenschmidt { 9240ab5fe53SBenjamin Herrenschmidt int cid = slave->chip_id; 9250ab5fe53SBenjamin Herrenschmidt int id; 9260ab5fe53SBenjamin Herrenschmidt 9270ab5fe53SBenjamin Herrenschmidt /* Check if we qualify for legacy numbering */ 9280ab5fe53SBenjamin Herrenschmidt if (cid >= 0 && cid < 16 && type < 4) { 9290ab5fe53SBenjamin Herrenschmidt /* Try reserving the legacy number */ 9300ab5fe53SBenjamin Herrenschmidt id = (cid << 4) | type; 9310ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); 9320ab5fe53SBenjamin Herrenschmidt if (id >= 0) { 9330ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(cid); 9340ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9350ab5fe53SBenjamin Herrenschmidt return 0; 9360ab5fe53SBenjamin Herrenschmidt } 9370ab5fe53SBenjamin Herrenschmidt /* Other failure */ 9380ab5fe53SBenjamin Herrenschmidt if (id != -ENOSPC) 9390ab5fe53SBenjamin Herrenschmidt return id; 9400ab5fe53SBenjamin Herrenschmidt /* Fallback to non-legacy allocation */ 9410ab5fe53SBenjamin Herrenschmidt } 9420ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP, 9430ab5fe53SBenjamin Herrenschmidt FSI_CHAR_MAX_DEVICES, GFP_KERNEL); 9440ab5fe53SBenjamin Herrenschmidt if (id < 0) 9450ab5fe53SBenjamin Herrenschmidt return id; 9460ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(id); 9470ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9480ab5fe53SBenjamin Herrenschmidt return 0; 9490ab5fe53SBenjamin Herrenschmidt } 9500ab5fe53SBenjamin Herrenschmidt 9510ab5fe53SBenjamin Herrenschmidt int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type, 9520ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9530ab5fe53SBenjamin Herrenschmidt { 9540ab5fe53SBenjamin Herrenschmidt return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index); 9550ab5fe53SBenjamin Herrenschmidt } 9560ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_get_new_minor); 9570ab5fe53SBenjamin Herrenschmidt 9580ab5fe53SBenjamin Herrenschmidt void fsi_free_minor(dev_t dev) 9590ab5fe53SBenjamin Herrenschmidt { 9600ab5fe53SBenjamin Herrenschmidt ida_simple_remove(&fsi_minor_ida, MINOR(dev)); 9610ab5fe53SBenjamin Herrenschmidt } 9620ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_free_minor); 9630ab5fe53SBenjamin Herrenschmidt 964414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 965414c1026SJeremy Kerr { 966d1dcd678SBenjamin Herrenschmidt uint32_t cfam_id; 9672b545cd8SJeremy Kerr struct fsi_slave *slave; 9682b545cd8SJeremy Kerr uint8_t crc; 96911454d6dSJoel Stanley __be32 data, llmode; 9702b545cd8SJeremy Kerr int rc; 971414c1026SJeremy Kerr 9722b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 9732b545cd8SJeremy Kerr * full 23-bit address range 9742b545cd8SJeremy Kerr */ 9752b545cd8SJeremy Kerr if (id != 0) 9762b545cd8SJeremy Kerr return -EINVAL; 9772b545cd8SJeremy Kerr 97811454d6dSJoel Stanley rc = fsi_master_read(master, link, id, 0, &data, sizeof(data)); 9792b545cd8SJeremy Kerr if (rc) { 9802b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 9812b545cd8SJeremy Kerr link, id, rc); 982414c1026SJeremy Kerr return -ENODEV; 983414c1026SJeremy Kerr } 984d1dcd678SBenjamin Herrenschmidt cfam_id = be32_to_cpu(data); 9852b545cd8SJeremy Kerr 986d1dcd678SBenjamin Herrenschmidt crc = crc4(0, cfam_id, 32); 9872b545cd8SJeremy Kerr if (crc) { 988d1dcd678SBenjamin Herrenschmidt dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n", 9892b545cd8SJeremy Kerr link, id); 9902b545cd8SJeremy Kerr return -EIO; 9912b545cd8SJeremy Kerr } 9922b545cd8SJeremy Kerr 993638bd9acSChristopher Bostic dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 994d1dcd678SBenjamin Herrenschmidt cfam_id, master->idx, link, id); 9952b545cd8SJeremy Kerr 9964af889b0SJeremy Kerr /* If we're behind a master that doesn't provide a self-running bus 9974af889b0SJeremy Kerr * clock, put the slave into async mode 9984af889b0SJeremy Kerr */ 9994af889b0SJeremy Kerr if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { 10004af889b0SJeremy Kerr llmode = cpu_to_be32(FSI_LLMODE_ASYNC); 10014af889b0SJeremy Kerr rc = fsi_master_write(master, link, id, 10024af889b0SJeremy Kerr FSI_SLAVE_BASE + FSI_LLMODE, 10034af889b0SJeremy Kerr &llmode, sizeof(llmode)); 10044af889b0SJeremy Kerr if (rc) 10054af889b0SJeremy Kerr dev_warn(&master->dev, 10064af889b0SJeremy Kerr "can't set llmode on slave:%02x:%02x %d\n", 10074af889b0SJeremy Kerr link, id, rc); 10084af889b0SJeremy Kerr } 10094af889b0SJeremy Kerr 10102b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 10112b545cd8SJeremy Kerr * register. 10122b545cd8SJeremy Kerr */ 10132b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 10142b545cd8SJeremy Kerr if (!slave) 10152b545cd8SJeremy Kerr return -ENOMEM; 10162b545cd8SJeremy Kerr 1017d1dcd678SBenjamin Herrenschmidt dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 1018d1dcd678SBenjamin Herrenschmidt slave->dev.type = &cfam_type; 10192b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 1020f6a2f8ebSJeremy Kerr slave->dev.of_node = fsi_slave_find_of_node(master, link, id); 10212b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 1022d1dcd678SBenjamin Herrenschmidt device_initialize(&slave->dev); 1023d1dcd678SBenjamin Herrenschmidt slave->cfam_id = cfam_id; 1024d1dcd678SBenjamin Herrenschmidt slave->master = master; 10252b545cd8SJeremy Kerr slave->link = link; 10262b545cd8SJeremy Kerr slave->id = id; 10272b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 1028a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = 16; 1029a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = 16; 1030a2e7da86SBenjamin Herrenschmidt 10310a213777SBenjamin Herrenschmidt /* Get chip ID if any */ 10320a213777SBenjamin Herrenschmidt slave->chip_id = -1; 10330a213777SBenjamin Herrenschmidt if (slave->dev.of_node) { 10340a213777SBenjamin Herrenschmidt uint32_t prop; 10350a213777SBenjamin Herrenschmidt if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop)) 10360a213777SBenjamin Herrenschmidt slave->chip_id = prop; 10370a213777SBenjamin Herrenschmidt 10380a213777SBenjamin Herrenschmidt } 1039d1dcd678SBenjamin Herrenschmidt 1040d1dcd678SBenjamin Herrenschmidt /* Allocate a minor in the FSI space */ 1041d1dcd678SBenjamin Herrenschmidt rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt, 1042d1dcd678SBenjamin Herrenschmidt &slave->cdev_idx); 1043d1dcd678SBenjamin Herrenschmidt if (rc) 1044d1dcd678SBenjamin Herrenschmidt goto err_free; 1045d1dcd678SBenjamin Herrenschmidt 1046d1dcd678SBenjamin Herrenschmidt /* Create chardev for userspace access */ 1047d1dcd678SBenjamin Herrenschmidt cdev_init(&slave->cdev, &cfam_fops); 1048d1dcd678SBenjamin Herrenschmidt rc = cdev_device_add(&slave->cdev, &slave->dev); 1049d1dcd678SBenjamin Herrenschmidt if (rc) { 1050d1dcd678SBenjamin Herrenschmidt dev_err(&slave->dev, "Error %d creating slave device\n", rc); 1051d1dcd678SBenjamin Herrenschmidt goto err_free; 1052d1dcd678SBenjamin Herrenschmidt } 1053d1dcd678SBenjamin Herrenschmidt 1054a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 1055a2e7da86SBenjamin Herrenschmidt if (rc) { 1056a2e7da86SBenjamin Herrenschmidt dev_warn(&master->dev, 1057a2e7da86SBenjamin Herrenschmidt "can't set smode on slave:%02x:%02x %d\n", 1058a2e7da86SBenjamin Herrenschmidt link, id, rc); 1059a2e7da86SBenjamin Herrenschmidt kfree(slave); 1060a2e7da86SBenjamin Herrenschmidt return -ENODEV; 1061a2e7da86SBenjamin Herrenschmidt } 1062a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1063a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 1064a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 1065a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 10662b545cd8SJeremy Kerr 1067d1dcd678SBenjamin Herrenschmidt /* Legacy raw file -> to be removed */ 1068125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 1069125739cbSJeremy Kerr if (rc) 1070125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 1071125739cbSJeremy Kerr 10720a213777SBenjamin Herrenschmidt 1073f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 1074f7ade2a6SJeremy Kerr if (rc) 1075f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 1076f7ade2a6SJeremy Kerr rc); 10772b545cd8SJeremy Kerr 10782b545cd8SJeremy Kerr return rc; 1079d1dcd678SBenjamin Herrenschmidt 1080d1dcd678SBenjamin Herrenschmidt err_free: 1081d1dcd678SBenjamin Herrenschmidt put_device(&slave->dev); 1082d1dcd678SBenjamin Herrenschmidt return rc; 10832b545cd8SJeremy Kerr } 1084414c1026SJeremy Kerr 108509aecfabSJeremy Kerr /* FSI master support */ 1086014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 1087014c2abcSJeremy Kerr { 108899f039e9SEddie James if (size == 4) { 108999f039e9SEddie James if (addr & 0x3) 1090014c2abcSJeremy Kerr return -EINVAL; 109199f039e9SEddie James } else if (size == 2) { 109299f039e9SEddie James if (addr & 0x1) 109399f039e9SEddie James return -EINVAL; 109499f039e9SEddie James } else if (size != 1) 1095014c2abcSJeremy Kerr return -EINVAL; 1096014c2abcSJeremy Kerr 1097014c2abcSJeremy Kerr return 0; 1098014c2abcSJeremy Kerr } 1099014c2abcSJeremy Kerr 1100014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 1101014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 1102014c2abcSJeremy Kerr { 1103014c2abcSJeremy Kerr int rc; 1104014c2abcSJeremy Kerr 110566433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 1106014c2abcSJeremy Kerr 110766433b05SJeremy Kerr rc = fsi_check_access(addr, size); 110866433b05SJeremy Kerr if (!rc) 110966433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 111066433b05SJeremy Kerr 111166433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 111266433b05SJeremy Kerr false, val, rc); 111366433b05SJeremy Kerr 111466433b05SJeremy Kerr return rc; 1115014c2abcSJeremy Kerr } 1116014c2abcSJeremy Kerr 1117014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 1118014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 1119014c2abcSJeremy Kerr { 1120014c2abcSJeremy Kerr int rc; 1121014c2abcSJeremy Kerr 112266433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 1123014c2abcSJeremy Kerr 112466433b05SJeremy Kerr rc = fsi_check_access(addr, size); 112566433b05SJeremy Kerr if (!rc) 112666433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 112766433b05SJeremy Kerr 112866433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 112966433b05SJeremy Kerr true, val, rc); 113066433b05SJeremy Kerr 113166433b05SJeremy Kerr return rc; 1132014c2abcSJeremy Kerr } 1133014c2abcSJeremy Kerr 113426095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 113526095282SChristopher Bostic { 113626095282SChristopher Bostic if (master->link_enable) 113726095282SChristopher Bostic return master->link_enable(master, link); 113826095282SChristopher Bostic 113926095282SChristopher Bostic return 0; 114026095282SChristopher Bostic } 114126095282SChristopher Bostic 114226095282SChristopher Bostic /* 114326095282SChristopher Bostic * Issue a break command on this link 114426095282SChristopher Bostic */ 114526095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 114626095282SChristopher Bostic { 1147a2e7da86SBenjamin Herrenschmidt int rc = 0; 1148a2e7da86SBenjamin Herrenschmidt 114966433b05SJeremy Kerr trace_fsi_master_break(master, link); 115066433b05SJeremy Kerr 115126095282SChristopher Bostic if (master->send_break) 1152a2e7da86SBenjamin Herrenschmidt rc = master->send_break(master, link); 1153a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1154a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 16, 16); 115526095282SChristopher Bostic 1156a2e7da86SBenjamin Herrenschmidt return rc; 115726095282SChristopher Bostic } 115826095282SChristopher Bostic 1159414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 1160414c1026SJeremy Kerr { 116126095282SChristopher Bostic int link, rc; 1162414c1026SJeremy Kerr 116326095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 116426095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 116526095282SChristopher Bostic if (rc) { 116626095282SChristopher Bostic dev_dbg(&master->dev, 116726095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 116826095282SChristopher Bostic continue; 116926095282SChristopher Bostic } 117026095282SChristopher Bostic rc = fsi_master_break(master, link); 117126095282SChristopher Bostic if (rc) { 117226095282SChristopher Bostic dev_dbg(&master->dev, 117326095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 117426095282SChristopher Bostic continue; 117526095282SChristopher Bostic } 117626095282SChristopher Bostic 1177414c1026SJeremy Kerr fsi_slave_init(master, link, 0); 117826095282SChristopher Bostic } 1179414c1026SJeremy Kerr 1180414c1026SJeremy Kerr return 0; 1181414c1026SJeremy Kerr } 1182414c1026SJeremy Kerr 1183cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 1184cd0fdb5cSChristopher Bostic { 1185cd0fdb5cSChristopher Bostic device_unregister(dev); 1186cd0fdb5cSChristopher Bostic return 0; 1187cd0fdb5cSChristopher Bostic } 1188cd0fdb5cSChristopher Bostic 1189cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 1190cd0fdb5cSChristopher Bostic { 1191d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 1192d1dcd678SBenjamin Herrenschmidt 1193cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 1194d1dcd678SBenjamin Herrenschmidt cdev_device_del(&slave->cdev, &slave->dev); 11950ab5fe53SBenjamin Herrenschmidt put_device(dev); 1196cd0fdb5cSChristopher Bostic return 0; 1197cd0fdb5cSChristopher Bostic } 1198cd0fdb5cSChristopher Bostic 1199cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 1200cd0fdb5cSChristopher Bostic { 1201cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 1202cd0fdb5cSChristopher Bostic } 1203cd0fdb5cSChristopher Bostic 120415362d69SJeremy Kerr int fsi_master_rescan(struct fsi_master *master) 120515362d69SJeremy Kerr { 120615362d69SJeremy Kerr fsi_master_unscan(master); 120715362d69SJeremy Kerr return fsi_master_scan(master); 120815362d69SJeremy Kerr } 120915362d69SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_rescan); 121015362d69SJeremy Kerr 1211cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 1212cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 1213cd0fdb5cSChristopher Bostic { 1214cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 1215cd0fdb5cSChristopher Bostic int rc; 1216cd0fdb5cSChristopher Bostic 121715362d69SJeremy Kerr rc = fsi_master_rescan(master); 1218cd0fdb5cSChristopher Bostic if (rc < 0) 1219cd0fdb5cSChristopher Bostic return rc; 1220cd0fdb5cSChristopher Bostic 1221cd0fdb5cSChristopher Bostic return count; 1222cd0fdb5cSChristopher Bostic } 1223cd0fdb5cSChristopher Bostic 1224cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 1225cd0fdb5cSChristopher Bostic 1226125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 1227125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 1228125739cbSJeremy Kerr { 1229125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 1230125739cbSJeremy Kerr 1231125739cbSJeremy Kerr fsi_master_break(master, 0); 1232125739cbSJeremy Kerr 1233125739cbSJeremy Kerr return count; 1234125739cbSJeremy Kerr } 1235125739cbSJeremy Kerr 1236125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 1237125739cbSJeremy Kerr 123809aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 123909aecfabSJeremy Kerr { 124009aecfabSJeremy Kerr int rc; 1241f3aa2c6fSChristopher Bostic struct device_node *np; 124209aecfabSJeremy Kerr 124309aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 124409aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 124509aecfabSJeremy Kerr 124609aecfabSJeremy Kerr rc = device_register(&master->dev); 1247414c1026SJeremy Kerr if (rc) { 124809aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 124909aecfabSJeremy Kerr return rc; 125009aecfabSJeremy Kerr } 1251414c1026SJeremy Kerr 1252cd0fdb5cSChristopher Bostic rc = device_create_file(&master->dev, &dev_attr_rescan); 1253cd0fdb5cSChristopher Bostic if (rc) { 1254265aac26SBenjamin Herrenschmidt device_del(&master->dev); 1255cd0fdb5cSChristopher Bostic ida_simple_remove(&master_ida, master->idx); 1256cd0fdb5cSChristopher Bostic return rc; 1257cd0fdb5cSChristopher Bostic } 1258cd0fdb5cSChristopher Bostic 1259125739cbSJeremy Kerr rc = device_create_file(&master->dev, &dev_attr_break); 1260125739cbSJeremy Kerr if (rc) { 1261265aac26SBenjamin Herrenschmidt device_del(&master->dev); 1262125739cbSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 1263125739cbSJeremy Kerr return rc; 1264125739cbSJeremy Kerr } 1265125739cbSJeremy Kerr 1266f3aa2c6fSChristopher Bostic np = dev_of_node(&master->dev); 1267f3aa2c6fSChristopher Bostic if (!of_property_read_bool(np, "no-scan-on-init")) 1268414c1026SJeremy Kerr fsi_master_scan(master); 1269cd0fdb5cSChristopher Bostic 1270414c1026SJeremy Kerr return 0; 1271414c1026SJeremy Kerr } 127209aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 127309aecfabSJeremy Kerr 127409aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 127509aecfabSJeremy Kerr { 127609aecfabSJeremy Kerr if (master->idx >= 0) { 127709aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 127809aecfabSJeremy Kerr master->idx = -1; 127909aecfabSJeremy Kerr } 128009aecfabSJeremy Kerr 1281cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 128209aecfabSJeremy Kerr device_unregister(&master->dev); 128309aecfabSJeremy Kerr } 128409aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 128509aecfabSJeremy Kerr 12860508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 12870508ad1fSJeremy Kerr 1288dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 1289dd37eed7SJeremy Kerr { 1290dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 1291dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 1292dd37eed7SJeremy Kerr const struct fsi_device_id *id; 1293dd37eed7SJeremy Kerr 1294dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 1295dd37eed7SJeremy Kerr return 0; 1296dd37eed7SJeremy Kerr 1297dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 1298dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 1299dd37eed7SJeremy Kerr continue; 1300dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 1301dd37eed7SJeremy Kerr id->version == fsi_dev->version) 1302dd37eed7SJeremy Kerr return 1; 1303dd37eed7SJeremy Kerr } 1304dd37eed7SJeremy Kerr 1305dd37eed7SJeremy Kerr return 0; 1306dd37eed7SJeremy Kerr } 1307dd37eed7SJeremy Kerr 1308356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 1309356d8009SChristopher Bostic { 1310356d8009SChristopher Bostic if (!fsi_drv) 1311356d8009SChristopher Bostic return -EINVAL; 1312356d8009SChristopher Bostic if (!fsi_drv->id_table) 1313356d8009SChristopher Bostic return -EINVAL; 1314356d8009SChristopher Bostic 1315356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 1316356d8009SChristopher Bostic } 1317356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 1318356d8009SChristopher Bostic 1319356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 1320356d8009SChristopher Bostic { 1321356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 1322356d8009SChristopher Bostic } 1323356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 1324356d8009SChristopher Bostic 13250508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 13260508ad1fSJeremy Kerr .name = "fsi", 1327dd37eed7SJeremy Kerr .match = fsi_bus_match, 13280508ad1fSJeremy Kerr }; 13290508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 13300508ad1fSJeremy Kerr 1331496f8931SJoel Stanley static int __init fsi_init(void) 13320508ad1fSJeremy Kerr { 13330ab5fe53SBenjamin Herrenschmidt int rc; 13340ab5fe53SBenjamin Herrenschmidt 13350ab5fe53SBenjamin Herrenschmidt rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi"); 13360ab5fe53SBenjamin Herrenschmidt if (rc) 13370ab5fe53SBenjamin Herrenschmidt return rc; 13380ab5fe53SBenjamin Herrenschmidt rc = bus_register(&fsi_bus_type); 13390ab5fe53SBenjamin Herrenschmidt if (rc) 13400ab5fe53SBenjamin Herrenschmidt goto fail_bus; 13410ab5fe53SBenjamin Herrenschmidt return 0; 13420ab5fe53SBenjamin Herrenschmidt 13430ab5fe53SBenjamin Herrenschmidt fail_bus: 13440ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 13450ab5fe53SBenjamin Herrenschmidt return rc; 13460508ad1fSJeremy Kerr } 1347496f8931SJoel Stanley postcore_initcall(fsi_init); 13480508ad1fSJeremy Kerr 13490508ad1fSJeremy Kerr static void fsi_exit(void) 13500508ad1fSJeremy Kerr { 13510508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 13520ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 13530ab5fe53SBenjamin Herrenschmidt ida_destroy(&fsi_minor_ida); 13540508ad1fSJeremy Kerr } 13550508ad1fSJeremy Kerr module_exit(fsi_exit); 13561fa847d7SJeremy Kerr module_param(discard_errors, int, 0664); 1357acb7e8f7SChristopher Bostic MODULE_LICENSE("GPL"); 13581fa847d7SJeremy Kerr MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); 1359