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 27f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) 28f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) 29f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 30f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) 31f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_SHIFT 12 32f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) 33f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_SHIFT 4 34f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_SHIFT 4 35f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) 36f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_DATA_BITS 28 37f7ade2a6SJeremy Kerr 384efe37f4SJeremy Kerr #define FSI_PEEK_BASE 0x410 394efe37f4SJeremy Kerr 40f7ade2a6SJeremy Kerr static const int engine_page_size = 0x400; 41f7ade2a6SJeremy Kerr 422b37c3e2SChristopher Bostic #define FSI_SLAVE_BASE 0x800 432b37c3e2SChristopher Bostic 442b37c3e2SChristopher Bostic /* 452b37c3e2SChristopher Bostic * FSI slave engine control register offsets 462b37c3e2SChristopher Bostic */ 472b37c3e2SChristopher Bostic #define FSI_SMODE 0x0 /* R/W: Mode register */ 481fa847d7SJeremy Kerr #define FSI_SISC 0x8 /* R/W: Interrupt condition */ 491fa847d7SJeremy Kerr #define FSI_SSTAT 0x14 /* R : Slave status */ 50196964a3SEddie James #define FSI_SLBUS 0x30 /* W : LBUS Ownership */ 514af889b0SJeremy Kerr #define FSI_LLMODE 0x100 /* R/W: Link layer mode register */ 522b37c3e2SChristopher Bostic 532b37c3e2SChristopher Bostic /* 542b37c3e2SChristopher Bostic * SMODE fields 552b37c3e2SChristopher Bostic */ 562b37c3e2SChristopher Bostic #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ 572b37c3e2SChristopher Bostic #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ 582b37c3e2SChristopher Bostic #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ 592b37c3e2SChristopher Bostic #define FSI_SMODE_SID_MASK 3 /* ID Mask */ 602b37c3e2SChristopher Bostic #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ 612b37c3e2SChristopher Bostic #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ 622b37c3e2SChristopher Bostic #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ 632b37c3e2SChristopher Bostic #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ 642b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ 652b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ 662b37c3e2SChristopher Bostic 674af889b0SJeremy Kerr /* 68196964a3SEddie James * SLBUS fields 69196964a3SEddie James */ 70196964a3SEddie James #define FSI_SLBUS_FORCE 0x80000000 /* Force LBUS ownership */ 71196964a3SEddie James 72196964a3SEddie James /* 734af889b0SJeremy Kerr * LLMODE fields 744af889b0SJeremy Kerr */ 754af889b0SJeremy Kerr #define FSI_LLMODE_ASYNC 0x1 764af889b0SJeremy Kerr 772b545cd8SJeremy Kerr #define FSI_SLAVE_SIZE_23b 0x800000 782b545cd8SJeremy Kerr 7909aecfabSJeremy Kerr static DEFINE_IDA(master_ida); 8009aecfabSJeremy Kerr 81faf0b116SJeremy Kerr struct fsi_slave { 82faf0b116SJeremy Kerr struct device dev; 83faf0b116SJeremy Kerr struct fsi_master *master; 84d1dcd678SBenjamin Herrenschmidt struct cdev cdev; 85d1dcd678SBenjamin Herrenschmidt int cdev_idx; 86d1dcd678SBenjamin Herrenschmidt int id; /* FSI address */ 87d1dcd678SBenjamin Herrenschmidt int link; /* FSI link# */ 88d1dcd678SBenjamin Herrenschmidt u32 cfam_id; 890a213777SBenjamin Herrenschmidt int chip_id; 90faf0b116SJeremy Kerr uint32_t size; /* size of slave address space */ 91a2e7da86SBenjamin Herrenschmidt u8 t_send_delay; 92a2e7da86SBenjamin Herrenschmidt u8 t_echo_delay; 93faf0b116SJeremy Kerr }; 94faf0b116SJeremy Kerr 95f2af60bbSEddie James #define CREATE_TRACE_POINTS 96f2af60bbSEddie James #include <trace/events/fsi.h> 97f2af60bbSEddie James 98cd0fdb5cSChristopher Bostic #define to_fsi_master(d) container_of(d, struct fsi_master, dev) 99faf0b116SJeremy Kerr #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) 100faf0b116SJeremy Kerr 1011fa847d7SJeremy Kerr static const int slave_retries = 2; 1021fa847d7SJeremy Kerr static int discard_errors; 1031fa847d7SJeremy Kerr 1040ab5fe53SBenjamin Herrenschmidt static dev_t fsi_base_dev; 1050ab5fe53SBenjamin Herrenschmidt static DEFINE_IDA(fsi_minor_ida); 1060ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_MAX_DEVICES 0x1000 1070ab5fe53SBenjamin Herrenschmidt 1080ab5fe53SBenjamin Herrenschmidt /* Legacy /dev numbering: 4 devices per chip, 16 chips */ 1090ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_LEGACY_TOP 64 1100ab5fe53SBenjamin Herrenschmidt 111014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 112014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 113014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 114014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 1151fa847d7SJeremy Kerr static int fsi_master_break(struct fsi_master *master, int link); 116014c2abcSJeremy Kerr 1174efe37f4SJeremy Kerr /* 1184efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 1194efe37f4SJeremy Kerr * 1204efe37f4SJeremy Kerr * FSI endpoint-device support 1214efe37f4SJeremy Kerr * 1224efe37f4SJeremy Kerr * Read / write / peek accessors for a client 1234efe37f4SJeremy Kerr * 1244efe37f4SJeremy Kerr * Parameters: 1254efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 1264efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 1274efe37f4SJeremy Kerr * plus desired offset to access its register space. 1284efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 1294efe37f4SJeremy Kerr * write this is value to write to the specified address. 1304efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 1314efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1324efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1334efe37f4SJeremy Kerr */ 1344efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1354efe37f4SJeremy Kerr size_t size) 1364efe37f4SJeremy Kerr { 1374efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1384efe37f4SJeremy Kerr return -EINVAL; 1394efe37f4SJeremy Kerr 1404efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1414efe37f4SJeremy Kerr } 1424efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1434efe37f4SJeremy Kerr 1444efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1454efe37f4SJeremy Kerr size_t size) 1464efe37f4SJeremy Kerr { 1474efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1484efe37f4SJeremy Kerr return -EINVAL; 1494efe37f4SJeremy Kerr 1504efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1514efe37f4SJeremy Kerr } 1524efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1534efe37f4SJeremy Kerr 1544efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1554efe37f4SJeremy Kerr { 1564efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1574efe37f4SJeremy Kerr 1584efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1594efe37f4SJeremy Kerr } 160f7ade2a6SJeremy Kerr 161f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 162f7ade2a6SJeremy Kerr { 163f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 164f7ade2a6SJeremy Kerr 165f6a2f8ebSJeremy Kerr of_node_put(device->dev.of_node); 166f7ade2a6SJeremy Kerr kfree(device); 167f7ade2a6SJeremy Kerr } 168f7ade2a6SJeremy Kerr 169f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 170f7ade2a6SJeremy Kerr { 171f7ade2a6SJeremy Kerr struct fsi_device *dev; 172f7ade2a6SJeremy Kerr 173f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 174f7ade2a6SJeremy Kerr if (!dev) 175f7ade2a6SJeremy Kerr return NULL; 176f7ade2a6SJeremy Kerr 177f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 178f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 179f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 180f7ade2a6SJeremy Kerr 181f7ade2a6SJeremy Kerr return dev; 182f7ade2a6SJeremy Kerr } 183f7ade2a6SJeremy Kerr 184414c1026SJeremy Kerr /* FSI slave support */ 185014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 186014c2abcSJeremy Kerr uint8_t *idp) 187014c2abcSJeremy Kerr { 188014c2abcSJeremy Kerr uint32_t addr = *addrp; 189014c2abcSJeremy Kerr uint8_t id = *idp; 190014c2abcSJeremy Kerr 191014c2abcSJeremy Kerr if (addr > slave->size) 192014c2abcSJeremy Kerr return -EINVAL; 193014c2abcSJeremy Kerr 194014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 195014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 196014c2abcSJeremy Kerr */ 197014c2abcSJeremy Kerr if (addr > 0x1fffff) { 198014c2abcSJeremy Kerr if (slave->id != 0) 199014c2abcSJeremy Kerr return -EINVAL; 200014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 201014c2abcSJeremy Kerr addr &= 0x1fffff; 202014c2abcSJeremy Kerr } 203014c2abcSJeremy Kerr 204014c2abcSJeremy Kerr *addrp = addr; 205014c2abcSJeremy Kerr *idp = id; 206014c2abcSJeremy Kerr return 0; 207014c2abcSJeremy Kerr } 208014c2abcSJeremy Kerr 209ed50a089SColin Ian King static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) 2101fa847d7SJeremy Kerr { 2111fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 21211454d6dSJoel Stanley __be32 irq, stat; 2131fa847d7SJeremy Kerr int rc, link; 2141fa847d7SJeremy Kerr uint8_t id; 2151fa847d7SJeremy Kerr 2161fa847d7SJeremy Kerr link = slave->link; 2171fa847d7SJeremy Kerr id = slave->id; 2181fa847d7SJeremy Kerr 2191fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2201fa847d7SJeremy Kerr &irq, sizeof(irq)); 2211fa847d7SJeremy Kerr if (rc) 2221fa847d7SJeremy Kerr return rc; 2231fa847d7SJeremy Kerr 2241fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, 2251fa847d7SJeremy Kerr &stat, sizeof(stat)); 2261fa847d7SJeremy Kerr if (rc) 2271fa847d7SJeremy Kerr return rc; 2281fa847d7SJeremy Kerr 229638bd9acSChristopher Bostic dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", 2301fa847d7SJeremy Kerr be32_to_cpu(stat), be32_to_cpu(irq)); 2311fa847d7SJeremy Kerr 2321fa847d7SJeremy Kerr /* clear interrupts */ 2331fa847d7SJeremy Kerr return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2341fa847d7SJeremy Kerr &irq, sizeof(irq)); 2351fa847d7SJeremy Kerr } 2361fa847d7SJeremy Kerr 237935f9636SBenjamin Herrenschmidt /* Encode slave local bus echo delay */ 238935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_echodly(int x) 239935f9636SBenjamin Herrenschmidt { 240935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 241935f9636SBenjamin Herrenschmidt } 242935f9636SBenjamin Herrenschmidt 243935f9636SBenjamin Herrenschmidt /* Encode slave local bus send delay */ 244935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_senddly(int x) 245935f9636SBenjamin Herrenschmidt { 246935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 247935f9636SBenjamin Herrenschmidt } 248935f9636SBenjamin Herrenschmidt 249935f9636SBenjamin Herrenschmidt /* Encode slave local bus clock rate ratio */ 250935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_lbcrr(int x) 251935f9636SBenjamin Herrenschmidt { 252935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 253935f9636SBenjamin Herrenschmidt } 254935f9636SBenjamin Herrenschmidt 255935f9636SBenjamin Herrenschmidt /* Encode slave ID */ 256935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_sid(int x) 257935f9636SBenjamin Herrenschmidt { 258935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 259935f9636SBenjamin Herrenschmidt } 260935f9636SBenjamin Herrenschmidt 261a2e7da86SBenjamin Herrenschmidt static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly) 262935f9636SBenjamin Herrenschmidt { 263935f9636SBenjamin Herrenschmidt return FSI_SMODE_WSC | FSI_SMODE_ECRC 264935f9636SBenjamin Herrenschmidt | fsi_smode_sid(id) 265a2e7da86SBenjamin Herrenschmidt | fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1) 266935f9636SBenjamin Herrenschmidt | fsi_smode_lbcrr(0x8); 267935f9636SBenjamin Herrenschmidt } 268935f9636SBenjamin Herrenschmidt 269a2e7da86SBenjamin Herrenschmidt static int fsi_slave_set_smode(struct fsi_slave *slave) 270935f9636SBenjamin Herrenschmidt { 271935f9636SBenjamin Herrenschmidt uint32_t smode; 272935f9636SBenjamin Herrenschmidt __be32 data; 273935f9636SBenjamin Herrenschmidt 274935f9636SBenjamin Herrenschmidt /* set our smode register with the slave ID field to 0; this enables 275935f9636SBenjamin Herrenschmidt * extended slave addressing 276935f9636SBenjamin Herrenschmidt */ 277a2e7da86SBenjamin Herrenschmidt smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay); 278935f9636SBenjamin Herrenschmidt data = cpu_to_be32(smode); 279935f9636SBenjamin Herrenschmidt 280a2e7da86SBenjamin Herrenschmidt return fsi_master_write(slave->master, slave->link, slave->id, 281a2e7da86SBenjamin Herrenschmidt FSI_SLAVE_BASE + FSI_SMODE, 282935f9636SBenjamin Herrenschmidt &data, sizeof(data)); 283935f9636SBenjamin Herrenschmidt } 2841fa847d7SJeremy Kerr 285ed50a089SColin Ian King static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, 286ed50a089SColin Ian King uint32_t addr, size_t size) 2871fa847d7SJeremy Kerr { 2881fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 2891fa847d7SJeremy Kerr int rc, link; 2901fa847d7SJeremy Kerr uint32_t reg; 291a2e7da86SBenjamin Herrenschmidt uint8_t id, send_delay, echo_delay; 2921fa847d7SJeremy Kerr 2931fa847d7SJeremy Kerr if (discard_errors) 2941fa847d7SJeremy Kerr return -1; 2951fa847d7SJeremy Kerr 2961fa847d7SJeremy Kerr link = slave->link; 2971fa847d7SJeremy Kerr id = slave->id; 2981fa847d7SJeremy Kerr 2991fa847d7SJeremy Kerr dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", 3001fa847d7SJeremy Kerr write ? "write" : "read", addr, size); 3011fa847d7SJeremy Kerr 3021fa847d7SJeremy Kerr /* try a simple clear of error conditions, which may fail if we've lost 3031fa847d7SJeremy Kerr * communication with the slave 3041fa847d7SJeremy Kerr */ 3051fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 3061fa847d7SJeremy Kerr if (!rc) 3071fa847d7SJeremy Kerr return 0; 3081fa847d7SJeremy Kerr 3091fa847d7SJeremy Kerr /* send a TERM and retry */ 3101fa847d7SJeremy Kerr if (master->term) { 3111fa847d7SJeremy Kerr rc = master->term(master, link, id); 3121fa847d7SJeremy Kerr if (!rc) { 3131fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, 0, 3141fa847d7SJeremy Kerr ®, sizeof(reg)); 3151fa847d7SJeremy Kerr if (!rc) 3161fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 3171fa847d7SJeremy Kerr if (!rc) 3181fa847d7SJeremy Kerr return 0; 3191fa847d7SJeremy Kerr } 3201fa847d7SJeremy Kerr } 3211fa847d7SJeremy Kerr 322a2e7da86SBenjamin Herrenschmidt send_delay = slave->t_send_delay; 323a2e7da86SBenjamin Herrenschmidt echo_delay = slave->t_echo_delay; 324a2e7da86SBenjamin Herrenschmidt 3251fa847d7SJeremy Kerr /* getting serious, reset the slave via BREAK */ 3261fa847d7SJeremy Kerr rc = fsi_master_break(master, link); 3271fa847d7SJeremy Kerr if (rc) 3281fa847d7SJeremy Kerr return rc; 3291fa847d7SJeremy Kerr 330a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = send_delay; 331a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = echo_delay; 332a2e7da86SBenjamin Herrenschmidt 333a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 3341fa847d7SJeremy Kerr if (rc) 3351fa847d7SJeremy Kerr return rc; 3361fa847d7SJeremy Kerr 337a2e7da86SBenjamin Herrenschmidt if (master->link_config) 338a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 339a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 340a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 341a2e7da86SBenjamin Herrenschmidt 3421fa847d7SJeremy Kerr return fsi_slave_report_and_clear_errors(slave); 3431fa847d7SJeremy Kerr } 3441fa847d7SJeremy Kerr 345da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 346014c2abcSJeremy Kerr void *val, size_t size) 347014c2abcSJeremy Kerr { 348014c2abcSJeremy Kerr uint8_t id = slave->id; 3491fa847d7SJeremy Kerr int rc, err_rc, i; 350014c2abcSJeremy Kerr 351014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 352014c2abcSJeremy Kerr if (rc) 353014c2abcSJeremy Kerr return rc; 354014c2abcSJeremy Kerr 3551fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3561fa847d7SJeremy Kerr rc = fsi_master_read(slave->master, slave->link, 3571fa847d7SJeremy Kerr id, addr, val, size); 3581fa847d7SJeremy Kerr if (!rc) 3591fa847d7SJeremy Kerr break; 3601fa847d7SJeremy Kerr 3611fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, false, addr, size); 3621fa847d7SJeremy Kerr if (err_rc) 3631fa847d7SJeremy Kerr break; 3641fa847d7SJeremy Kerr } 3651fa847d7SJeremy Kerr 3661fa847d7SJeremy Kerr return rc; 367014c2abcSJeremy Kerr } 368da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 369014c2abcSJeremy Kerr 370da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 371014c2abcSJeremy Kerr const void *val, size_t size) 372014c2abcSJeremy Kerr { 373014c2abcSJeremy Kerr uint8_t id = slave->id; 3741fa847d7SJeremy Kerr int rc, err_rc, i; 375014c2abcSJeremy Kerr 376014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 377014c2abcSJeremy Kerr if (rc) 378014c2abcSJeremy Kerr return rc; 379014c2abcSJeremy Kerr 3801fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3811fa847d7SJeremy Kerr rc = fsi_master_write(slave->master, slave->link, 3821fa847d7SJeremy Kerr id, addr, val, size); 3831fa847d7SJeremy Kerr if (!rc) 3841fa847d7SJeremy Kerr break; 3851fa847d7SJeremy Kerr 3861fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, true, addr, size); 3871fa847d7SJeremy Kerr if (err_rc) 3881fa847d7SJeremy Kerr break; 3891fa847d7SJeremy Kerr } 3901fa847d7SJeremy Kerr 3911fa847d7SJeremy Kerr return rc; 392014c2abcSJeremy Kerr } 393da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 394da36cadfSJeremy Kerr 395362fbc83STom Rix int fsi_slave_claim_range(struct fsi_slave *slave, 396da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 397da36cadfSJeremy Kerr { 398da36cadfSJeremy Kerr if (addr + size < addr) 399da36cadfSJeremy Kerr return -EINVAL; 400da36cadfSJeremy Kerr 401da36cadfSJeremy Kerr if (addr + size > slave->size) 402da36cadfSJeremy Kerr return -EINVAL; 403da36cadfSJeremy Kerr 404da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 405da36cadfSJeremy Kerr return 0; 406da36cadfSJeremy Kerr } 407da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 408da36cadfSJeremy Kerr 409362fbc83STom Rix void fsi_slave_release_range(struct fsi_slave *slave, 410da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 411da36cadfSJeremy Kerr { 412da36cadfSJeremy Kerr } 413da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 414014c2abcSJeremy Kerr 415f6a2f8ebSJeremy Kerr static bool fsi_device_node_matches(struct device *dev, struct device_node *np, 416f6a2f8ebSJeremy Kerr uint32_t addr, uint32_t size) 417f6a2f8ebSJeremy Kerr { 418f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 419f6a2f8ebSJeremy Kerr const __be32 *prop; 420f6a2f8ebSJeremy Kerr uint32_t psize; 421f6a2f8ebSJeremy Kerr 422f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 423f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 424f6a2f8ebSJeremy Kerr 425f6a2f8ebSJeremy Kerr if (na != 1 || ns != 1) 426f6a2f8ebSJeremy Kerr return false; 427f6a2f8ebSJeremy Kerr 428f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 429f6a2f8ebSJeremy Kerr if (!prop || len != 8) 430f6a2f8ebSJeremy Kerr return false; 431f6a2f8ebSJeremy Kerr 432f6a2f8ebSJeremy Kerr if (of_read_number(prop, 1) != addr) 433f6a2f8ebSJeremy Kerr return false; 434f6a2f8ebSJeremy Kerr 435f6a2f8ebSJeremy Kerr psize = of_read_number(prop + 1, 1); 436f6a2f8ebSJeremy Kerr if (psize != size) { 437f6a2f8ebSJeremy Kerr dev_warn(dev, 438f6a2f8ebSJeremy Kerr "node %s matches probed address, but not size (got 0x%x, expected 0x%x)", 439f6a2f8ebSJeremy Kerr of_node_full_name(np), psize, size); 440f6a2f8ebSJeremy Kerr } 441f6a2f8ebSJeremy Kerr 442f6a2f8ebSJeremy Kerr return true; 443f6a2f8ebSJeremy Kerr } 444f6a2f8ebSJeremy Kerr 445f6a2f8ebSJeremy Kerr /* Find a matching node for the slave engine at @address, using @size bytes 446f6a2f8ebSJeremy Kerr * of space. Returns NULL if not found, or a matching node with refcount 447f6a2f8ebSJeremy Kerr * already incremented. 448f6a2f8ebSJeremy Kerr */ 449f6a2f8ebSJeremy Kerr static struct device_node *fsi_device_find_of_node(struct fsi_device *dev) 450f6a2f8ebSJeremy Kerr { 451f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 452f6a2f8ebSJeremy Kerr 453f6a2f8ebSJeremy Kerr parent = dev_of_node(&dev->slave->dev); 454f6a2f8ebSJeremy Kerr if (!parent) 455f6a2f8ebSJeremy Kerr return NULL; 456f6a2f8ebSJeremy Kerr 457f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 458f6a2f8ebSJeremy Kerr if (fsi_device_node_matches(&dev->dev, np, 459f6a2f8ebSJeremy Kerr dev->addr, dev->size)) 460f6a2f8ebSJeremy Kerr return np; 461f6a2f8ebSJeremy Kerr } 462f6a2f8ebSJeremy Kerr 463f6a2f8ebSJeremy Kerr return NULL; 464f6a2f8ebSJeremy Kerr } 465f6a2f8ebSJeremy Kerr 466f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 467f7ade2a6SJeremy Kerr { 468f7ade2a6SJeremy Kerr uint32_t engine_addr; 469f7ade2a6SJeremy Kerr int rc, i; 470f7ade2a6SJeremy Kerr 471f7ade2a6SJeremy Kerr /* 472f7ade2a6SJeremy Kerr * scan engines 473f7ade2a6SJeremy Kerr * 474f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 475f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 476f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 477f7ade2a6SJeremy Kerr */ 478f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 479f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 480f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 481f7ade2a6SJeremy Kerr struct fsi_device *dev; 48211454d6dSJoel Stanley uint32_t conf; 48311454d6dSJoel Stanley __be32 data; 484f7ade2a6SJeremy Kerr 48511454d6dSJoel Stanley rc = fsi_slave_read(slave, (i + 1) * sizeof(data), 48611454d6dSJoel Stanley &data, sizeof(data)); 487f7ade2a6SJeremy Kerr if (rc) { 488f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 489f7ade2a6SJeremy Kerr "error reading slave registers\n"); 490f7ade2a6SJeremy Kerr return -1; 491f7ade2a6SJeremy Kerr } 49211454d6dSJoel Stanley conf = be32_to_cpu(data); 493f7ade2a6SJeremy Kerr 494f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 495f7ade2a6SJeremy Kerr if (crc) { 496f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 497f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 498f7ade2a6SJeremy Kerr i); 499f7ade2a6SJeremy Kerr return -1; 500f7ade2a6SJeremy Kerr } 501f7ade2a6SJeremy Kerr 502f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 503f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 504f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 505f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 506f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 507f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 508f7ade2a6SJeremy Kerr 509f7ade2a6SJeremy Kerr /* 510f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 511f7ade2a6SJeremy Kerr * skips the defined address areas 512f7ade2a6SJeremy Kerr */ 513f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 514f7ade2a6SJeremy Kerr 515f7ade2a6SJeremy Kerr /* create device */ 516f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 517f7ade2a6SJeremy Kerr if (!dev) 518f7ade2a6SJeremy Kerr return -ENOMEM; 519f7ade2a6SJeremy Kerr 520f7ade2a6SJeremy Kerr dev->slave = slave; 521f7ade2a6SJeremy Kerr dev->engine_type = type; 522f7ade2a6SJeremy Kerr dev->version = version; 523f7ade2a6SJeremy Kerr dev->unit = i; 524f7ade2a6SJeremy Kerr dev->addr = engine_addr; 525f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 526f7ade2a6SJeremy Kerr 527f2af60bbSEddie James trace_fsi_dev_init(dev); 528f2af60bbSEddie James 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 5559f4c2b51SAndrew Jeffery static unsigned long aligned_access_size(size_t offset, size_t count) 5569f4c2b51SAndrew Jeffery { 5579f4c2b51SAndrew Jeffery unsigned long offset_unit, count_unit; 5589f4c2b51SAndrew Jeffery 5599f4c2b51SAndrew Jeffery /* Criteria: 5609f4c2b51SAndrew Jeffery * 5619f4c2b51SAndrew Jeffery * 1. Access size must be less than or equal to the maximum access 5629f4c2b51SAndrew Jeffery * width or the highest power-of-two factor of offset 5639f4c2b51SAndrew Jeffery * 2. Access size must be less than or equal to the amount specified by 5649f4c2b51SAndrew Jeffery * count 5659f4c2b51SAndrew Jeffery * 5669f4c2b51SAndrew Jeffery * The access width is optimal if we can calculate 1 to be strictly 5679f4c2b51SAndrew Jeffery * equal while still satisfying 2. 5689f4c2b51SAndrew Jeffery */ 5699f4c2b51SAndrew Jeffery 5709f4c2b51SAndrew Jeffery /* Find 1 by the bottom bit of offset (with a 4 byte access cap) */ 5719f4c2b51SAndrew Jeffery offset_unit = BIT(__builtin_ctzl(offset | 4)); 5729f4c2b51SAndrew Jeffery 5739f4c2b51SAndrew Jeffery /* Find 2 by the top bit of count */ 5749f4c2b51SAndrew Jeffery count_unit = BIT(8 * sizeof(unsigned long) - 1 - __builtin_clzl(count)); 5759f4c2b51SAndrew Jeffery 5769f4c2b51SAndrew Jeffery /* Constrain the maximum access width to the minimum of both criteria */ 5779f4c2b51SAndrew Jeffery return BIT(__builtin_ctzl(offset_unit | count_unit)); 5789f4c2b51SAndrew Jeffery } 5799f4c2b51SAndrew Jeffery 580125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 581125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 582125739cbSJeremy Kerr loff_t off, size_t count) 583125739cbSJeremy Kerr { 584125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 585125739cbSJeremy Kerr size_t total_len, read_len; 586125739cbSJeremy Kerr int rc; 587125739cbSJeremy Kerr 588125739cbSJeremy Kerr if (off < 0) 589125739cbSJeremy Kerr return -EINVAL; 590125739cbSJeremy Kerr 591125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 592125739cbSJeremy Kerr return -EINVAL; 593125739cbSJeremy Kerr 594125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += read_len) { 5959f4c2b51SAndrew Jeffery read_len = aligned_access_size(off, count - total_len); 596125739cbSJeremy Kerr 597125739cbSJeremy Kerr rc = fsi_slave_read(slave, off, buf + total_len, read_len); 598125739cbSJeremy Kerr if (rc) 599125739cbSJeremy Kerr return rc; 600125739cbSJeremy Kerr 601125739cbSJeremy Kerr off += read_len; 602125739cbSJeremy Kerr } 603125739cbSJeremy Kerr 604125739cbSJeremy Kerr return count; 605125739cbSJeremy Kerr } 606125739cbSJeremy Kerr 607125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_write(struct file *file, 608125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 609125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 610125739cbSJeremy Kerr { 611125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 612125739cbSJeremy Kerr size_t total_len, write_len; 613125739cbSJeremy Kerr int rc; 614125739cbSJeremy Kerr 615125739cbSJeremy Kerr if (off < 0) 616125739cbSJeremy Kerr return -EINVAL; 617125739cbSJeremy Kerr 618125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 619125739cbSJeremy Kerr return -EINVAL; 620125739cbSJeremy Kerr 621125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += write_len) { 6229f4c2b51SAndrew Jeffery write_len = aligned_access_size(off, count - total_len); 623125739cbSJeremy Kerr 624125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 625125739cbSJeremy Kerr if (rc) 626125739cbSJeremy Kerr return rc; 627125739cbSJeremy Kerr 628125739cbSJeremy Kerr off += write_len; 629125739cbSJeremy Kerr } 630125739cbSJeremy Kerr 631125739cbSJeremy Kerr return count; 632125739cbSJeremy Kerr } 633125739cbSJeremy Kerr 634061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_raw_attr = { 635125739cbSJeremy Kerr .attr = { 636125739cbSJeremy Kerr .name = "raw", 637125739cbSJeremy Kerr .mode = 0600, 638125739cbSJeremy Kerr }, 639125739cbSJeremy Kerr .size = 0, 640125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 641125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 642125739cbSJeremy Kerr }; 643125739cbSJeremy Kerr 6442b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 6452b545cd8SJeremy Kerr { 6462b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 6472b545cd8SJeremy Kerr 6480ab5fe53SBenjamin Herrenschmidt fsi_free_minor(slave->dev.devt); 649f6a2f8ebSJeremy Kerr of_node_put(dev->of_node); 6502b545cd8SJeremy Kerr kfree(slave); 6512b545cd8SJeremy Kerr } 6522b545cd8SJeremy Kerr 653f6a2f8ebSJeremy Kerr static bool fsi_slave_node_matches(struct device_node *np, 654f6a2f8ebSJeremy Kerr int link, uint8_t id) 655f6a2f8ebSJeremy Kerr { 656f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 657f6a2f8ebSJeremy Kerr const __be32 *prop; 658f6a2f8ebSJeremy Kerr 659f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 660f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 661f6a2f8ebSJeremy Kerr 662f6a2f8ebSJeremy Kerr /* Ensure we have the correct format for addresses and sizes in 663f6a2f8ebSJeremy Kerr * reg properties 664f6a2f8ebSJeremy Kerr */ 665f6a2f8ebSJeremy Kerr if (na != 2 || ns != 0) 666f6a2f8ebSJeremy Kerr return false; 667f6a2f8ebSJeremy Kerr 668f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 669f6a2f8ebSJeremy Kerr if (!prop || len != 8) 670f6a2f8ebSJeremy Kerr return false; 671f6a2f8ebSJeremy Kerr 672f6a2f8ebSJeremy Kerr return (of_read_number(prop, 1) == link) && 673f6a2f8ebSJeremy Kerr (of_read_number(prop + 1, 1) == id); 674f6a2f8ebSJeremy Kerr } 675f6a2f8ebSJeremy Kerr 676f6a2f8ebSJeremy Kerr /* Find a matching node for the slave at (link, id). Returns NULL if none 677f6a2f8ebSJeremy Kerr * found, or a matching node with refcount already incremented. 678f6a2f8ebSJeremy Kerr */ 679f6a2f8ebSJeremy Kerr static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, 680f6a2f8ebSJeremy Kerr int link, uint8_t id) 681f6a2f8ebSJeremy Kerr { 682f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 683f6a2f8ebSJeremy Kerr 684f6a2f8ebSJeremy Kerr parent = dev_of_node(&master->dev); 685f6a2f8ebSJeremy Kerr if (!parent) 686f6a2f8ebSJeremy Kerr return NULL; 687f6a2f8ebSJeremy Kerr 688f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 689f6a2f8ebSJeremy Kerr if (fsi_slave_node_matches(np, link, id)) 690f6a2f8ebSJeremy Kerr return np; 691f6a2f8ebSJeremy Kerr } 692f6a2f8ebSJeremy Kerr 693f6a2f8ebSJeremy Kerr return NULL; 694f6a2f8ebSJeremy Kerr } 695f6a2f8ebSJeremy Kerr 696d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count, 697d1dcd678SBenjamin Herrenschmidt loff_t *offset) 698d1dcd678SBenjamin Herrenschmidt { 699d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 700d1dcd678SBenjamin Herrenschmidt size_t total_len, read_len; 701d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 702d1dcd678SBenjamin Herrenschmidt ssize_t rc; 703d1dcd678SBenjamin Herrenschmidt 704d1dcd678SBenjamin Herrenschmidt if (off < 0) 705d1dcd678SBenjamin Herrenschmidt return -EINVAL; 706d1dcd678SBenjamin Herrenschmidt 707d1dcd678SBenjamin Herrenschmidt if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 708d1dcd678SBenjamin Herrenschmidt return -EINVAL; 709d1dcd678SBenjamin Herrenschmidt 710d1dcd678SBenjamin Herrenschmidt for (total_len = 0; total_len < count; total_len += read_len) { 711d1dcd678SBenjamin Herrenschmidt __be32 data; 712d1dcd678SBenjamin Herrenschmidt 713d1dcd678SBenjamin Herrenschmidt read_len = min_t(size_t, count, 4); 714d1dcd678SBenjamin Herrenschmidt read_len -= off & 0x3; 715d1dcd678SBenjamin Herrenschmidt 716d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_read(slave, off, &data, read_len); 717d1dcd678SBenjamin Herrenschmidt if (rc) 718d1dcd678SBenjamin Herrenschmidt goto fail; 719d1dcd678SBenjamin Herrenschmidt rc = copy_to_user(buf + total_len, &data, read_len); 720d1dcd678SBenjamin Herrenschmidt if (rc) { 721d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 722d1dcd678SBenjamin Herrenschmidt goto fail; 723d1dcd678SBenjamin Herrenschmidt } 724d1dcd678SBenjamin Herrenschmidt off += read_len; 725d1dcd678SBenjamin Herrenschmidt } 726d1dcd678SBenjamin Herrenschmidt rc = count; 727d1dcd678SBenjamin Herrenschmidt fail: 728d1dcd678SBenjamin Herrenschmidt *offset = off; 72991081094SColin Ian King return rc; 730d1dcd678SBenjamin Herrenschmidt } 731d1dcd678SBenjamin Herrenschmidt 732d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_write(struct file *filep, const char __user *buf, 733d1dcd678SBenjamin Herrenschmidt size_t count, loff_t *offset) 734d1dcd678SBenjamin Herrenschmidt { 735d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 736d1dcd678SBenjamin Herrenschmidt size_t total_len, write_len; 737d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 738d1dcd678SBenjamin Herrenschmidt ssize_t rc; 739d1dcd678SBenjamin Herrenschmidt 740d1dcd678SBenjamin Herrenschmidt 741d1dcd678SBenjamin Herrenschmidt if (off < 0) 742d1dcd678SBenjamin Herrenschmidt return -EINVAL; 743d1dcd678SBenjamin Herrenschmidt 744d1dcd678SBenjamin Herrenschmidt if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 745d1dcd678SBenjamin Herrenschmidt return -EINVAL; 746d1dcd678SBenjamin Herrenschmidt 747d1dcd678SBenjamin Herrenschmidt for (total_len = 0; total_len < count; total_len += write_len) { 748d1dcd678SBenjamin Herrenschmidt __be32 data; 749d1dcd678SBenjamin Herrenschmidt 750d1dcd678SBenjamin Herrenschmidt write_len = min_t(size_t, count, 4); 751d1dcd678SBenjamin Herrenschmidt write_len -= off & 0x3; 752d1dcd678SBenjamin Herrenschmidt 753d1dcd678SBenjamin Herrenschmidt rc = copy_from_user(&data, buf + total_len, write_len); 754d1dcd678SBenjamin Herrenschmidt if (rc) { 755d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 756d1dcd678SBenjamin Herrenschmidt goto fail; 757d1dcd678SBenjamin Herrenschmidt } 758d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_write(slave, off, &data, write_len); 759d1dcd678SBenjamin Herrenschmidt if (rc) 760d1dcd678SBenjamin Herrenschmidt goto fail; 761d1dcd678SBenjamin Herrenschmidt off += write_len; 762d1dcd678SBenjamin Herrenschmidt } 763d1dcd678SBenjamin Herrenschmidt rc = count; 764d1dcd678SBenjamin Herrenschmidt fail: 765d1dcd678SBenjamin Herrenschmidt *offset = off; 76691081094SColin Ian King return rc; 767d1dcd678SBenjamin Herrenschmidt } 768d1dcd678SBenjamin Herrenschmidt 769d1dcd678SBenjamin Herrenschmidt static loff_t cfam_llseek(struct file *file, loff_t offset, int whence) 770d1dcd678SBenjamin Herrenschmidt { 771d1dcd678SBenjamin Herrenschmidt switch (whence) { 772d1dcd678SBenjamin Herrenschmidt case SEEK_CUR: 773d1dcd678SBenjamin Herrenschmidt break; 774d1dcd678SBenjamin Herrenschmidt case SEEK_SET: 775d1dcd678SBenjamin Herrenschmidt file->f_pos = offset; 776d1dcd678SBenjamin Herrenschmidt break; 777d1dcd678SBenjamin Herrenschmidt default: 778d1dcd678SBenjamin Herrenschmidt return -EINVAL; 779d1dcd678SBenjamin Herrenschmidt } 780d1dcd678SBenjamin Herrenschmidt 781d1dcd678SBenjamin Herrenschmidt return offset; 782d1dcd678SBenjamin Herrenschmidt } 783d1dcd678SBenjamin Herrenschmidt 784d1dcd678SBenjamin Herrenschmidt static int cfam_open(struct inode *inode, struct file *file) 785d1dcd678SBenjamin Herrenschmidt { 786d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev); 787d1dcd678SBenjamin Herrenschmidt 788d1dcd678SBenjamin Herrenschmidt file->private_data = slave; 789d1dcd678SBenjamin Herrenschmidt 790d1dcd678SBenjamin Herrenschmidt return 0; 791d1dcd678SBenjamin Herrenschmidt } 792d1dcd678SBenjamin Herrenschmidt 793d1dcd678SBenjamin Herrenschmidt static const struct file_operations cfam_fops = { 794d1dcd678SBenjamin Herrenschmidt .owner = THIS_MODULE, 795d1dcd678SBenjamin Herrenschmidt .open = cfam_open, 796d1dcd678SBenjamin Herrenschmidt .llseek = cfam_llseek, 797d1dcd678SBenjamin Herrenschmidt .read = cfam_read, 798d1dcd678SBenjamin Herrenschmidt .write = cfam_write, 799d1dcd678SBenjamin Herrenschmidt }; 800d1dcd678SBenjamin Herrenschmidt 801d1dcd678SBenjamin Herrenschmidt static ssize_t send_term_store(struct device *dev, 802d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 803d1dcd678SBenjamin Herrenschmidt const char *buf, size_t count) 804d1dcd678SBenjamin Herrenschmidt { 805d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 806d1dcd678SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 807d1dcd678SBenjamin Herrenschmidt 808d1dcd678SBenjamin Herrenschmidt if (!master->term) 809d1dcd678SBenjamin Herrenschmidt return -ENODEV; 810d1dcd678SBenjamin Herrenschmidt 811d1dcd678SBenjamin Herrenschmidt master->term(master, slave->link, slave->id); 812d1dcd678SBenjamin Herrenschmidt return count; 813d1dcd678SBenjamin Herrenschmidt } 814d1dcd678SBenjamin Herrenschmidt 815d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_WO(send_term); 816d1dcd678SBenjamin Herrenschmidt 817a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_show(struct device *dev, 818a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, 819a2e7da86SBenjamin Herrenschmidt char *buf) 820a2e7da86SBenjamin Herrenschmidt { 821a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 822a2e7da86SBenjamin Herrenschmidt 823a2e7da86SBenjamin Herrenschmidt return sprintf(buf, "%u\n", slave->t_send_delay); 824a2e7da86SBenjamin Herrenschmidt } 825a2e7da86SBenjamin Herrenschmidt 826a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_store(struct device *dev, 827a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, const char *buf, size_t count) 828a2e7da86SBenjamin Herrenschmidt { 829a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 830a2e7da86SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 831a2e7da86SBenjamin Herrenschmidt unsigned long val; 832a2e7da86SBenjamin Herrenschmidt int rc; 833a2e7da86SBenjamin Herrenschmidt 834a2e7da86SBenjamin Herrenschmidt if (kstrtoul(buf, 0, &val) < 0) 835a2e7da86SBenjamin Herrenschmidt return -EINVAL; 836a2e7da86SBenjamin Herrenschmidt 837a2e7da86SBenjamin Herrenschmidt if (val < 1 || val > 16) 838a2e7da86SBenjamin Herrenschmidt return -EINVAL; 839a2e7da86SBenjamin Herrenschmidt 840a2e7da86SBenjamin Herrenschmidt if (!master->link_config) 841a2e7da86SBenjamin Herrenschmidt return -ENXIO; 842a2e7da86SBenjamin Herrenschmidt 843a2e7da86SBenjamin Herrenschmidt /* Current HW mandates that send and echo delay are identical */ 844a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = val; 845a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = val; 846a2e7da86SBenjamin Herrenschmidt 847a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 848a2e7da86SBenjamin Herrenschmidt if (rc < 0) 849a2e7da86SBenjamin Herrenschmidt return rc; 850a2e7da86SBenjamin Herrenschmidt if (master->link_config) 851a2e7da86SBenjamin Herrenschmidt master->link_config(master, slave->link, 852a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 853a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 854a2e7da86SBenjamin Herrenschmidt 855a2e7da86SBenjamin Herrenschmidt return count; 856a2e7da86SBenjamin Herrenschmidt } 857a2e7da86SBenjamin Herrenschmidt 858a2e7da86SBenjamin Herrenschmidt static DEVICE_ATTR(send_echo_delays, 0600, 859a2e7da86SBenjamin Herrenschmidt slave_send_echo_show, slave_send_echo_store); 860a2e7da86SBenjamin Herrenschmidt 8610a213777SBenjamin Herrenschmidt static ssize_t chip_id_show(struct device *dev, 8620a213777SBenjamin Herrenschmidt struct device_attribute *attr, 8630a213777SBenjamin Herrenschmidt char *buf) 8640a213777SBenjamin Herrenschmidt { 8650a213777SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 8660a213777SBenjamin Herrenschmidt 8670a213777SBenjamin Herrenschmidt return sprintf(buf, "%d\n", slave->chip_id); 8680a213777SBenjamin Herrenschmidt } 8690a213777SBenjamin Herrenschmidt 8700a213777SBenjamin Herrenschmidt static DEVICE_ATTR_RO(chip_id); 8710a213777SBenjamin Herrenschmidt 872d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_id_show(struct device *dev, 873d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 874d1dcd678SBenjamin Herrenschmidt char *buf) 875d1dcd678SBenjamin Herrenschmidt { 876d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 877d1dcd678SBenjamin Herrenschmidt 878d1dcd678SBenjamin Herrenschmidt return sprintf(buf, "0x%x\n", slave->cfam_id); 879d1dcd678SBenjamin Herrenschmidt } 880d1dcd678SBenjamin Herrenschmidt 881d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_RO(cfam_id); 882d1dcd678SBenjamin Herrenschmidt 883d1dcd678SBenjamin Herrenschmidt static struct attribute *cfam_attr[] = { 884d1dcd678SBenjamin Herrenschmidt &dev_attr_send_echo_delays.attr, 885d1dcd678SBenjamin Herrenschmidt &dev_attr_chip_id.attr, 886d1dcd678SBenjamin Herrenschmidt &dev_attr_cfam_id.attr, 887d1dcd678SBenjamin Herrenschmidt &dev_attr_send_term.attr, 888d1dcd678SBenjamin Herrenschmidt NULL, 889d1dcd678SBenjamin Herrenschmidt }; 890d1dcd678SBenjamin Herrenschmidt 891d1dcd678SBenjamin Herrenschmidt static const struct attribute_group cfam_attr_group = { 892d1dcd678SBenjamin Herrenschmidt .attrs = cfam_attr, 893d1dcd678SBenjamin Herrenschmidt }; 894d1dcd678SBenjamin Herrenschmidt 895d1dcd678SBenjamin Herrenschmidt static const struct attribute_group *cfam_attr_groups[] = { 896d1dcd678SBenjamin Herrenschmidt &cfam_attr_group, 897d1dcd678SBenjamin Herrenschmidt NULL, 898d1dcd678SBenjamin Herrenschmidt }; 899d1dcd678SBenjamin Herrenschmidt 900*a9b12f8bSGreg Kroah-Hartman static char *cfam_devnode(const struct device *dev, umode_t *mode, 901d1dcd678SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 902d1dcd678SBenjamin Herrenschmidt { 903*a9b12f8bSGreg Kroah-Hartman const struct fsi_slave *slave = to_fsi_slave(dev); 904d1dcd678SBenjamin Herrenschmidt 905d1dcd678SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 906d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx); 907d1dcd678SBenjamin Herrenschmidt #else 908d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx); 909d1dcd678SBenjamin Herrenschmidt #endif 910d1dcd678SBenjamin Herrenschmidt } 911d1dcd678SBenjamin Herrenschmidt 912d1dcd678SBenjamin Herrenschmidt static const struct device_type cfam_type = { 913d1dcd678SBenjamin Herrenschmidt .name = "cfam", 914d1dcd678SBenjamin Herrenschmidt .devnode = cfam_devnode, 915d1dcd678SBenjamin Herrenschmidt .groups = cfam_attr_groups 916d1dcd678SBenjamin Herrenschmidt }; 917d1dcd678SBenjamin Herrenschmidt 918*a9b12f8bSGreg Kroah-Hartman static char *fsi_cdev_devnode(const struct device *dev, umode_t *mode, 9190ab5fe53SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 9200ab5fe53SBenjamin Herrenschmidt { 9210ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 9220ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev)); 9230ab5fe53SBenjamin Herrenschmidt #else 9240ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 9250ab5fe53SBenjamin Herrenschmidt #endif 9260ab5fe53SBenjamin Herrenschmidt } 9270ab5fe53SBenjamin Herrenschmidt 9280ab5fe53SBenjamin Herrenschmidt const struct device_type fsi_cdev_type = { 9290ab5fe53SBenjamin Herrenschmidt .name = "fsi-cdev", 9300ab5fe53SBenjamin Herrenschmidt .devnode = fsi_cdev_devnode, 9310ab5fe53SBenjamin Herrenschmidt }; 9320ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_cdev_type); 9330ab5fe53SBenjamin Herrenschmidt 9340ab5fe53SBenjamin Herrenschmidt /* Backward compatible /dev/ numbering in "old style" mode */ 9350ab5fe53SBenjamin Herrenschmidt static int fsi_adjust_index(int index) 9360ab5fe53SBenjamin Herrenschmidt { 9370ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 9380ab5fe53SBenjamin Herrenschmidt return index; 9390ab5fe53SBenjamin Herrenschmidt #else 9400ab5fe53SBenjamin Herrenschmidt return index + 1; 9410ab5fe53SBenjamin Herrenschmidt #endif 9420ab5fe53SBenjamin Herrenschmidt } 9430ab5fe53SBenjamin Herrenschmidt 9440ab5fe53SBenjamin Herrenschmidt static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type, 9450ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9460ab5fe53SBenjamin Herrenschmidt { 9470ab5fe53SBenjamin Herrenschmidt int cid = slave->chip_id; 9480ab5fe53SBenjamin Herrenschmidt int id; 9490ab5fe53SBenjamin Herrenschmidt 9500ab5fe53SBenjamin Herrenschmidt /* Check if we qualify for legacy numbering */ 9510ab5fe53SBenjamin Herrenschmidt if (cid >= 0 && cid < 16 && type < 4) { 9520ab5fe53SBenjamin Herrenschmidt /* Try reserving the legacy number */ 9530ab5fe53SBenjamin Herrenschmidt id = (cid << 4) | type; 9540ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); 9550ab5fe53SBenjamin Herrenschmidt if (id >= 0) { 9560ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(cid); 9570ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9580ab5fe53SBenjamin Herrenschmidt return 0; 9590ab5fe53SBenjamin Herrenschmidt } 9600ab5fe53SBenjamin Herrenschmidt /* Other failure */ 9610ab5fe53SBenjamin Herrenschmidt if (id != -ENOSPC) 9620ab5fe53SBenjamin Herrenschmidt return id; 9630ab5fe53SBenjamin Herrenschmidt /* Fallback to non-legacy allocation */ 9640ab5fe53SBenjamin Herrenschmidt } 9650ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP, 9660ab5fe53SBenjamin Herrenschmidt FSI_CHAR_MAX_DEVICES, GFP_KERNEL); 9670ab5fe53SBenjamin Herrenschmidt if (id < 0) 9680ab5fe53SBenjamin Herrenschmidt return id; 9690ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(id); 9700ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9710ab5fe53SBenjamin Herrenschmidt return 0; 9720ab5fe53SBenjamin Herrenschmidt } 9730ab5fe53SBenjamin Herrenschmidt 9740ab5fe53SBenjamin Herrenschmidt int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type, 9750ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9760ab5fe53SBenjamin Herrenschmidt { 9770ab5fe53SBenjamin Herrenschmidt return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index); 9780ab5fe53SBenjamin Herrenschmidt } 9790ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_get_new_minor); 9800ab5fe53SBenjamin Herrenschmidt 9810ab5fe53SBenjamin Herrenschmidt void fsi_free_minor(dev_t dev) 9820ab5fe53SBenjamin Herrenschmidt { 9830ab5fe53SBenjamin Herrenschmidt ida_simple_remove(&fsi_minor_ida, MINOR(dev)); 9840ab5fe53SBenjamin Herrenschmidt } 9850ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_free_minor); 9860ab5fe53SBenjamin Herrenschmidt 987414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 988414c1026SJeremy Kerr { 989d1dcd678SBenjamin Herrenschmidt uint32_t cfam_id; 9902b545cd8SJeremy Kerr struct fsi_slave *slave; 9912b545cd8SJeremy Kerr uint8_t crc; 992196964a3SEddie James __be32 data, llmode, slbus; 9932b545cd8SJeremy Kerr int rc; 994414c1026SJeremy Kerr 9952b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 9962b545cd8SJeremy Kerr * full 23-bit address range 9972b545cd8SJeremy Kerr */ 9982b545cd8SJeremy Kerr if (id != 0) 9992b545cd8SJeremy Kerr return -EINVAL; 10002b545cd8SJeremy Kerr 100111454d6dSJoel Stanley rc = fsi_master_read(master, link, id, 0, &data, sizeof(data)); 10022b545cd8SJeremy Kerr if (rc) { 10032b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 10042b545cd8SJeremy Kerr link, id, rc); 1005414c1026SJeremy Kerr return -ENODEV; 1006414c1026SJeremy Kerr } 1007d1dcd678SBenjamin Herrenschmidt cfam_id = be32_to_cpu(data); 10082b545cd8SJeremy Kerr 1009d1dcd678SBenjamin Herrenschmidt crc = crc4(0, cfam_id, 32); 10102b545cd8SJeremy Kerr if (crc) { 1011f2af60bbSEddie James trace_fsi_slave_invalid_cfam(master, link, cfam_id); 1012d1dcd678SBenjamin Herrenschmidt dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n", 10132b545cd8SJeremy Kerr link, id); 10142b545cd8SJeremy Kerr return -EIO; 10152b545cd8SJeremy Kerr } 10162b545cd8SJeremy Kerr 1017638bd9acSChristopher Bostic dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 1018d1dcd678SBenjamin Herrenschmidt cfam_id, master->idx, link, id); 10192b545cd8SJeremy Kerr 10204af889b0SJeremy Kerr /* If we're behind a master that doesn't provide a self-running bus 10214af889b0SJeremy Kerr * clock, put the slave into async mode 10224af889b0SJeremy Kerr */ 10234af889b0SJeremy Kerr if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { 10244af889b0SJeremy Kerr llmode = cpu_to_be32(FSI_LLMODE_ASYNC); 10254af889b0SJeremy Kerr rc = fsi_master_write(master, link, id, 10264af889b0SJeremy Kerr FSI_SLAVE_BASE + FSI_LLMODE, 10274af889b0SJeremy Kerr &llmode, sizeof(llmode)); 10284af889b0SJeremy Kerr if (rc) 10294af889b0SJeremy Kerr dev_warn(&master->dev, 10304af889b0SJeremy Kerr "can't set llmode on slave:%02x:%02x %d\n", 10314af889b0SJeremy Kerr link, id, rc); 10324af889b0SJeremy Kerr } 10334af889b0SJeremy Kerr 10342b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 10352b545cd8SJeremy Kerr * register. 10362b545cd8SJeremy Kerr */ 10372b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 10382b545cd8SJeremy Kerr if (!slave) 10392b545cd8SJeremy Kerr return -ENOMEM; 10402b545cd8SJeremy Kerr 1041d1dcd678SBenjamin Herrenschmidt dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 1042d1dcd678SBenjamin Herrenschmidt slave->dev.type = &cfam_type; 10432b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 1044f6a2f8ebSJeremy Kerr slave->dev.of_node = fsi_slave_find_of_node(master, link, id); 10452b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 1046d1dcd678SBenjamin Herrenschmidt device_initialize(&slave->dev); 1047d1dcd678SBenjamin Herrenschmidt slave->cfam_id = cfam_id; 1048d1dcd678SBenjamin Herrenschmidt slave->master = master; 10492b545cd8SJeremy Kerr slave->link = link; 10502b545cd8SJeremy Kerr slave->id = id; 10512b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 1052a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = 16; 1053a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = 16; 1054a2e7da86SBenjamin Herrenschmidt 10550a213777SBenjamin Herrenschmidt /* Get chip ID if any */ 10560a213777SBenjamin Herrenschmidt slave->chip_id = -1; 10570a213777SBenjamin Herrenschmidt if (slave->dev.of_node) { 10580a213777SBenjamin Herrenschmidt uint32_t prop; 10590a213777SBenjamin Herrenschmidt if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop)) 10600a213777SBenjamin Herrenschmidt slave->chip_id = prop; 10610a213777SBenjamin Herrenschmidt 10620a213777SBenjamin Herrenschmidt } 1063d1dcd678SBenjamin Herrenschmidt 1064196964a3SEddie James slbus = cpu_to_be32(FSI_SLBUS_FORCE); 1065196964a3SEddie James rc = fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SLBUS, 1066196964a3SEddie James &slbus, sizeof(slbus)); 1067196964a3SEddie James if (rc) 1068196964a3SEddie James dev_warn(&master->dev, 1069196964a3SEddie James "can't set slbus on slave:%02x:%02x %d\n", link, id, 1070196964a3SEddie James rc); 1071196964a3SEddie James 1072371975b0SJeremy Kerr rc = fsi_slave_set_smode(slave); 1073371975b0SJeremy Kerr if (rc) { 1074371975b0SJeremy Kerr dev_warn(&master->dev, 1075371975b0SJeremy Kerr "can't set smode on slave:%02x:%02x %d\n", 1076371975b0SJeremy Kerr link, id, rc); 1077371975b0SJeremy Kerr goto err_free; 1078371975b0SJeremy Kerr } 1079371975b0SJeremy Kerr 1080d1dcd678SBenjamin Herrenschmidt /* Allocate a minor in the FSI space */ 1081d1dcd678SBenjamin Herrenschmidt rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt, 1082d1dcd678SBenjamin Herrenschmidt &slave->cdev_idx); 1083d1dcd678SBenjamin Herrenschmidt if (rc) 1084d1dcd678SBenjamin Herrenschmidt goto err_free; 1085d1dcd678SBenjamin Herrenschmidt 1086f2af60bbSEddie James trace_fsi_slave_init(slave); 1087f2af60bbSEddie James 1088d1dcd678SBenjamin Herrenschmidt /* Create chardev for userspace access */ 1089d1dcd678SBenjamin Herrenschmidt cdev_init(&slave->cdev, &cfam_fops); 1090d1dcd678SBenjamin Herrenschmidt rc = cdev_device_add(&slave->cdev, &slave->dev); 1091d1dcd678SBenjamin Herrenschmidt if (rc) { 1092d1dcd678SBenjamin Herrenschmidt dev_err(&slave->dev, "Error %d creating slave device\n", rc); 1093371975b0SJeremy Kerr goto err_free_ida; 1094d1dcd678SBenjamin Herrenschmidt } 1095d1dcd678SBenjamin Herrenschmidt 1096371975b0SJeremy Kerr /* Now that we have the cdev registered with the core, any fatal 1097371975b0SJeremy Kerr * failures beyond this point will need to clean up through 1098371975b0SJeremy Kerr * cdev_device_del(). Fortunately though, nothing past here is fatal. 1099371975b0SJeremy Kerr */ 1100371975b0SJeremy Kerr 1101a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1102a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 1103a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 1104a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 11052b545cd8SJeremy Kerr 1106d1dcd678SBenjamin Herrenschmidt /* Legacy raw file -> to be removed */ 1107125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 1108125739cbSJeremy Kerr if (rc) 1109125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 1110125739cbSJeremy Kerr 11110a213777SBenjamin Herrenschmidt 1112f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 1113f7ade2a6SJeremy Kerr if (rc) 1114f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 1115f7ade2a6SJeremy Kerr rc); 11162b545cd8SJeremy Kerr 1117371975b0SJeremy Kerr return 0; 1118d1dcd678SBenjamin Herrenschmidt 1119371975b0SJeremy Kerr err_free_ida: 1120371975b0SJeremy Kerr fsi_free_minor(slave->dev.devt); 1121d1dcd678SBenjamin Herrenschmidt err_free: 1122371975b0SJeremy Kerr of_node_put(slave->dev.of_node); 1123371975b0SJeremy Kerr kfree(slave); 1124d1dcd678SBenjamin Herrenschmidt return rc; 11252b545cd8SJeremy Kerr } 1126414c1026SJeremy Kerr 112709aecfabSJeremy Kerr /* FSI master support */ 1128014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 1129014c2abcSJeremy Kerr { 113099f039e9SEddie James if (size == 4) { 113199f039e9SEddie James if (addr & 0x3) 1132014c2abcSJeremy Kerr return -EINVAL; 113399f039e9SEddie James } else if (size == 2) { 113499f039e9SEddie James if (addr & 0x1) 113599f039e9SEddie James return -EINVAL; 113699f039e9SEddie James } else if (size != 1) 1137014c2abcSJeremy Kerr return -EINVAL; 1138014c2abcSJeremy Kerr 1139014c2abcSJeremy Kerr return 0; 1140014c2abcSJeremy Kerr } 1141014c2abcSJeremy Kerr 1142014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 1143014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 1144014c2abcSJeremy Kerr { 1145014c2abcSJeremy Kerr int rc; 1146014c2abcSJeremy Kerr 114766433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 1148014c2abcSJeremy Kerr 114966433b05SJeremy Kerr rc = fsi_check_access(addr, size); 115066433b05SJeremy Kerr if (!rc) 115166433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 115266433b05SJeremy Kerr 115366433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 115466433b05SJeremy Kerr false, val, rc); 115566433b05SJeremy Kerr 115666433b05SJeremy Kerr return rc; 1157014c2abcSJeremy Kerr } 1158014c2abcSJeremy Kerr 1159014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 1160014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 1161014c2abcSJeremy Kerr { 1162014c2abcSJeremy Kerr int rc; 1163014c2abcSJeremy Kerr 116466433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 1165014c2abcSJeremy Kerr 116666433b05SJeremy Kerr rc = fsi_check_access(addr, size); 116766433b05SJeremy Kerr if (!rc) 116866433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 116966433b05SJeremy Kerr 117066433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 117166433b05SJeremy Kerr true, val, rc); 117266433b05SJeremy Kerr 117366433b05SJeremy Kerr return rc; 1174014c2abcSJeremy Kerr } 1175014c2abcSJeremy Kerr 1176b36875a4SEddie James static int fsi_master_link_disable(struct fsi_master *master, int link) 1177b36875a4SEddie James { 1178b36875a4SEddie James if (master->link_enable) 1179b36875a4SEddie James return master->link_enable(master, link, false); 1180b36875a4SEddie James 1181b36875a4SEddie James return 0; 1182b36875a4SEddie James } 1183b36875a4SEddie James 118426095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 118526095282SChristopher Bostic { 118626095282SChristopher Bostic if (master->link_enable) 118704635a30SEddie James return master->link_enable(master, link, true); 118826095282SChristopher Bostic 118926095282SChristopher Bostic return 0; 119026095282SChristopher Bostic } 119126095282SChristopher Bostic 119226095282SChristopher Bostic /* 119326095282SChristopher Bostic * Issue a break command on this link 119426095282SChristopher Bostic */ 119526095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 119626095282SChristopher Bostic { 1197a2e7da86SBenjamin Herrenschmidt int rc = 0; 1198a2e7da86SBenjamin Herrenschmidt 119966433b05SJeremy Kerr trace_fsi_master_break(master, link); 120066433b05SJeremy Kerr 120126095282SChristopher Bostic if (master->send_break) 1202a2e7da86SBenjamin Herrenschmidt rc = master->send_break(master, link); 1203a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1204a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 16, 16); 120526095282SChristopher Bostic 1206a2e7da86SBenjamin Herrenschmidt return rc; 120726095282SChristopher Bostic } 120826095282SChristopher Bostic 1209414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 1210414c1026SJeremy Kerr { 121126095282SChristopher Bostic int link, rc; 1212414c1026SJeremy Kerr 121326095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 121426095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 121526095282SChristopher Bostic if (rc) { 121626095282SChristopher Bostic dev_dbg(&master->dev, 121726095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 121826095282SChristopher Bostic continue; 121926095282SChristopher Bostic } 122026095282SChristopher Bostic rc = fsi_master_break(master, link); 122126095282SChristopher Bostic if (rc) { 1222b36875a4SEddie James fsi_master_link_disable(master, link); 122326095282SChristopher Bostic dev_dbg(&master->dev, 122426095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 122526095282SChristopher Bostic continue; 122626095282SChristopher Bostic } 122726095282SChristopher Bostic 1228b36875a4SEddie James rc = fsi_slave_init(master, link, 0); 1229b36875a4SEddie James if (rc) 1230b36875a4SEddie James fsi_master_link_disable(master, link); 123126095282SChristopher Bostic } 1232414c1026SJeremy Kerr 1233414c1026SJeremy Kerr return 0; 1234414c1026SJeremy Kerr } 1235414c1026SJeremy Kerr 1236cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 1237cd0fdb5cSChristopher Bostic { 1238cd0fdb5cSChristopher Bostic device_unregister(dev); 1239cd0fdb5cSChristopher Bostic return 0; 1240cd0fdb5cSChristopher Bostic } 1241cd0fdb5cSChristopher Bostic 1242cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 1243cd0fdb5cSChristopher Bostic { 1244d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 1245d1dcd678SBenjamin Herrenschmidt 1246cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 1247d1dcd678SBenjamin Herrenschmidt cdev_device_del(&slave->cdev, &slave->dev); 12480ab5fe53SBenjamin Herrenschmidt put_device(dev); 1249cd0fdb5cSChristopher Bostic return 0; 1250cd0fdb5cSChristopher Bostic } 1251cd0fdb5cSChristopher Bostic 1252cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 1253cd0fdb5cSChristopher Bostic { 1254cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 1255cd0fdb5cSChristopher Bostic } 1256cd0fdb5cSChristopher Bostic 125715362d69SJeremy Kerr int fsi_master_rescan(struct fsi_master *master) 125815362d69SJeremy Kerr { 12599840fcd8SBenjamin Herrenschmidt int rc; 12609840fcd8SBenjamin Herrenschmidt 12619840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 126215362d69SJeremy Kerr fsi_master_unscan(master); 12639840fcd8SBenjamin Herrenschmidt rc = fsi_master_scan(master); 12649840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 12659840fcd8SBenjamin Herrenschmidt 12669840fcd8SBenjamin Herrenschmidt return rc; 126715362d69SJeremy Kerr } 126815362d69SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_rescan); 126915362d69SJeremy Kerr 1270cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 1271cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 1272cd0fdb5cSChristopher Bostic { 1273cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 1274cd0fdb5cSChristopher Bostic int rc; 1275cd0fdb5cSChristopher Bostic 127615362d69SJeremy Kerr rc = fsi_master_rescan(master); 1277cd0fdb5cSChristopher Bostic if (rc < 0) 1278cd0fdb5cSChristopher Bostic return rc; 1279cd0fdb5cSChristopher Bostic 1280cd0fdb5cSChristopher Bostic return count; 1281cd0fdb5cSChristopher Bostic } 1282cd0fdb5cSChristopher Bostic 1283cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 1284cd0fdb5cSChristopher Bostic 1285125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 1286125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 1287125739cbSJeremy Kerr { 1288125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 1289125739cbSJeremy Kerr 1290125739cbSJeremy Kerr fsi_master_break(master, 0); 1291125739cbSJeremy Kerr 1292125739cbSJeremy Kerr return count; 1293125739cbSJeremy Kerr } 1294125739cbSJeremy Kerr 1295125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 1296125739cbSJeremy Kerr 1297cf700ba0SJeremy Kerr static struct attribute *master_attrs[] = { 1298cf700ba0SJeremy Kerr &dev_attr_break.attr, 1299cf700ba0SJeremy Kerr &dev_attr_rescan.attr, 1300cf700ba0SJeremy Kerr NULL 1301cf700ba0SJeremy Kerr }; 1302cf700ba0SJeremy Kerr 1303cf700ba0SJeremy Kerr ATTRIBUTE_GROUPS(master); 1304cf700ba0SJeremy Kerr 130556ec311fSkbuild test robot static struct class fsi_master_class = { 13062e32c2d6SJeremy Kerr .name = "fsi-master", 1307cf700ba0SJeremy Kerr .dev_groups = master_groups, 13082e32c2d6SJeremy Kerr }; 13092e32c2d6SJeremy Kerr 131009aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 131109aecfabSJeremy Kerr { 131209aecfabSJeremy Kerr int rc; 1313f3aa2c6fSChristopher Bostic struct device_node *np; 131409aecfabSJeremy Kerr 13159840fcd8SBenjamin Herrenschmidt mutex_init(&master->scan_lock); 131609aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 131735af9fb4SJiasheng Jiang if (master->idx < 0) 131835af9fb4SJiasheng Jiang return master->idx; 131935af9fb4SJiasheng Jiang 132009aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 13212e32c2d6SJeremy Kerr master->dev.class = &fsi_master_class; 132209aecfabSJeremy Kerr 132309aecfabSJeremy Kerr rc = device_register(&master->dev); 1324414c1026SJeremy Kerr if (rc) { 132509aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 132609aecfabSJeremy Kerr return rc; 132709aecfabSJeremy Kerr } 1328414c1026SJeremy Kerr 1329f3aa2c6fSChristopher Bostic np = dev_of_node(&master->dev); 13309840fcd8SBenjamin Herrenschmidt if (!of_property_read_bool(np, "no-scan-on-init")) { 13319840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 1332414c1026SJeremy Kerr fsi_master_scan(master); 13339840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 13349840fcd8SBenjamin Herrenschmidt } 1335cd0fdb5cSChristopher Bostic 1336414c1026SJeremy Kerr return 0; 1337414c1026SJeremy Kerr } 133809aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 133909aecfabSJeremy Kerr 134009aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 134109aecfabSJeremy Kerr { 134209aecfabSJeremy Kerr if (master->idx >= 0) { 134309aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 134409aecfabSJeremy Kerr master->idx = -1; 134509aecfabSJeremy Kerr } 134609aecfabSJeremy Kerr 13479840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 1348cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 13499840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 135009aecfabSJeremy Kerr device_unregister(&master->dev); 135109aecfabSJeremy Kerr } 135209aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 135309aecfabSJeremy Kerr 13540508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 13550508ad1fSJeremy Kerr 1356dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 1357dd37eed7SJeremy Kerr { 1358dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 1359dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 1360dd37eed7SJeremy Kerr const struct fsi_device_id *id; 1361dd37eed7SJeremy Kerr 1362dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 1363dd37eed7SJeremy Kerr return 0; 1364dd37eed7SJeremy Kerr 1365dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 1366dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 1367dd37eed7SJeremy Kerr continue; 1368dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 1369dd37eed7SJeremy Kerr id->version == fsi_dev->version) 1370dd37eed7SJeremy Kerr return 1; 1371dd37eed7SJeremy Kerr } 1372dd37eed7SJeremy Kerr 1373dd37eed7SJeremy Kerr return 0; 1374dd37eed7SJeremy Kerr } 1375dd37eed7SJeremy Kerr 1376356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 1377356d8009SChristopher Bostic { 1378356d8009SChristopher Bostic if (!fsi_drv) 1379356d8009SChristopher Bostic return -EINVAL; 1380356d8009SChristopher Bostic if (!fsi_drv->id_table) 1381356d8009SChristopher Bostic return -EINVAL; 1382356d8009SChristopher Bostic 1383356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 1384356d8009SChristopher Bostic } 1385356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 1386356d8009SChristopher Bostic 1387356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 1388356d8009SChristopher Bostic { 1389356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 1390356d8009SChristopher Bostic } 1391356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 1392356d8009SChristopher Bostic 13930508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 13940508ad1fSJeremy Kerr .name = "fsi", 1395dd37eed7SJeremy Kerr .match = fsi_bus_match, 13960508ad1fSJeremy Kerr }; 13970508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 13980508ad1fSJeremy Kerr 1399496f8931SJoel Stanley static int __init fsi_init(void) 14000508ad1fSJeremy Kerr { 14010ab5fe53SBenjamin Herrenschmidt int rc; 14020ab5fe53SBenjamin Herrenschmidt 14030ab5fe53SBenjamin Herrenschmidt rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi"); 14040ab5fe53SBenjamin Herrenschmidt if (rc) 14050ab5fe53SBenjamin Herrenschmidt return rc; 14060ab5fe53SBenjamin Herrenschmidt rc = bus_register(&fsi_bus_type); 14070ab5fe53SBenjamin Herrenschmidt if (rc) 14080ab5fe53SBenjamin Herrenschmidt goto fail_bus; 14092e32c2d6SJeremy Kerr 14102e32c2d6SJeremy Kerr rc = class_register(&fsi_master_class); 14112e32c2d6SJeremy Kerr if (rc) 14122e32c2d6SJeremy Kerr goto fail_class; 14132e32c2d6SJeremy Kerr 14140ab5fe53SBenjamin Herrenschmidt return 0; 14150ab5fe53SBenjamin Herrenschmidt 14162e32c2d6SJeremy Kerr fail_class: 14172e32c2d6SJeremy Kerr bus_unregister(&fsi_bus_type); 14180ab5fe53SBenjamin Herrenschmidt fail_bus: 14190ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 14200ab5fe53SBenjamin Herrenschmidt return rc; 14210508ad1fSJeremy Kerr } 1422496f8931SJoel Stanley postcore_initcall(fsi_init); 14230508ad1fSJeremy Kerr 14240508ad1fSJeremy Kerr static void fsi_exit(void) 14250508ad1fSJeremy Kerr { 14262e32c2d6SJeremy Kerr class_unregister(&fsi_master_class); 14270508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 14280ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 14290ab5fe53SBenjamin Herrenschmidt ida_destroy(&fsi_minor_ida); 14300508ad1fSJeremy Kerr } 14310508ad1fSJeremy Kerr module_exit(fsi_exit); 14321fa847d7SJeremy Kerr module_param(discard_errors, int, 0664); 1433acb7e8f7SChristopher Bostic MODULE_LICENSE("GPL"); 14341fa847d7SJeremy Kerr MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); 1435