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> 1923ad7ec1SRob Herring #include <linux/of_address.h> 20c21d322eSEddie James #include <linux/of_device.h> 212b545cd8SJeremy Kerr #include <linux/slab.h> 22f7ade2a6SJeremy Kerr #include <linux/bitops.h> 23d1dcd678SBenjamin Herrenschmidt #include <linux/cdev.h> 24d1dcd678SBenjamin Herrenschmidt #include <linux/fs.h> 25d1dcd678SBenjamin Herrenschmidt #include <linux/uaccess.h> 260508ad1fSJeremy Kerr 2709aecfabSJeremy Kerr #include "fsi-master.h" 28d5d8dfb0SEddie James #include "fsi-slave.h" 29d5d8dfb0SEddie James 30d5d8dfb0SEddie James #define CREATE_TRACE_POINTS 31d5d8dfb0SEddie James #include <trace/events/fsi.h> 3209aecfabSJeremy Kerr 33f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) 34f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) 35f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 36f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) 37f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_SHIFT 12 38f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) 39f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_SHIFT 4 40f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_SHIFT 4 41f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) 42f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_DATA_BITS 28 43f7ade2a6SJeremy Kerr 444efe37f4SJeremy Kerr #define FSI_PEEK_BASE 0x410 454efe37f4SJeremy Kerr 46f7ade2a6SJeremy Kerr static const int engine_page_size = 0x400; 47f7ade2a6SJeremy Kerr 482b37c3e2SChristopher Bostic #define FSI_SLAVE_BASE 0x800 492b37c3e2SChristopher Bostic 502b37c3e2SChristopher Bostic /* 512b37c3e2SChristopher Bostic * FSI slave engine control register offsets 522b37c3e2SChristopher Bostic */ 532b37c3e2SChristopher Bostic #define FSI_SMODE 0x0 /* R/W: Mode register */ 541fa847d7SJeremy Kerr #define FSI_SISC 0x8 /* R/W: Interrupt condition */ 551fa847d7SJeremy Kerr #define FSI_SSTAT 0x14 /* R : Slave status */ 56196964a3SEddie James #define FSI_SLBUS 0x30 /* W : LBUS Ownership */ 574af889b0SJeremy Kerr #define FSI_LLMODE 0x100 /* R/W: Link layer mode register */ 582b37c3e2SChristopher Bostic 592b37c3e2SChristopher Bostic /* 602b37c3e2SChristopher Bostic * SMODE fields 612b37c3e2SChristopher Bostic */ 622b37c3e2SChristopher Bostic #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ 632b37c3e2SChristopher Bostic #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ 642b37c3e2SChristopher Bostic #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ 652b37c3e2SChristopher Bostic #define FSI_SMODE_SID_MASK 3 /* ID Mask */ 662b37c3e2SChristopher Bostic #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ 672b37c3e2SChristopher Bostic #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ 682b37c3e2SChristopher Bostic #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ 692b37c3e2SChristopher Bostic #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ 702b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ 712b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ 722b37c3e2SChristopher Bostic 734af889b0SJeremy Kerr /* 74196964a3SEddie James * SLBUS fields 75196964a3SEddie James */ 76196964a3SEddie James #define FSI_SLBUS_FORCE 0x80000000 /* Force LBUS ownership */ 77196964a3SEddie James 78196964a3SEddie James /* 794af889b0SJeremy Kerr * LLMODE fields 804af889b0SJeremy Kerr */ 814af889b0SJeremy Kerr #define FSI_LLMODE_ASYNC 0x1 824af889b0SJeremy Kerr 832b545cd8SJeremy Kerr #define FSI_SLAVE_SIZE_23b 0x800000 842b545cd8SJeremy Kerr 8509aecfabSJeremy Kerr static DEFINE_IDA(master_ida); 8609aecfabSJeremy Kerr 871fa847d7SJeremy Kerr static const int slave_retries = 2; 881fa847d7SJeremy Kerr static int discard_errors; 891fa847d7SJeremy Kerr 900ab5fe53SBenjamin Herrenschmidt static dev_t fsi_base_dev; 910ab5fe53SBenjamin Herrenschmidt static DEFINE_IDA(fsi_minor_ida); 920ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_MAX_DEVICES 0x1000 930ab5fe53SBenjamin Herrenschmidt 940ab5fe53SBenjamin Herrenschmidt /* Legacy /dev numbering: 4 devices per chip, 16 chips */ 950ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_LEGACY_TOP 64 960ab5fe53SBenjamin Herrenschmidt 97014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 98014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 99014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 100014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 1011fa847d7SJeremy Kerr static int fsi_master_break(struct fsi_master *master, int link); 102014c2abcSJeremy Kerr 1034efe37f4SJeremy Kerr /* 1044efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 1054efe37f4SJeremy Kerr * 1064efe37f4SJeremy Kerr * FSI endpoint-device support 1074efe37f4SJeremy Kerr * 1084efe37f4SJeremy Kerr * Read / write / peek accessors for a client 1094efe37f4SJeremy Kerr * 1104efe37f4SJeremy Kerr * Parameters: 1114efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 1124efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 1134efe37f4SJeremy Kerr * plus desired offset to access its register space. 1144efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 1154efe37f4SJeremy Kerr * write this is value to write to the specified address. 1164efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 1174efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1184efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1194efe37f4SJeremy Kerr */ 1204efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1214efe37f4SJeremy Kerr size_t size) 1224efe37f4SJeremy Kerr { 1234efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1244efe37f4SJeremy Kerr return -EINVAL; 1254efe37f4SJeremy Kerr 1264efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1274efe37f4SJeremy Kerr } 1284efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1294efe37f4SJeremy Kerr 1304efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1314efe37f4SJeremy Kerr size_t size) 1324efe37f4SJeremy Kerr { 1334efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1344efe37f4SJeremy Kerr return -EINVAL; 1354efe37f4SJeremy Kerr 1364efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1374efe37f4SJeremy Kerr } 1384efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1394efe37f4SJeremy Kerr 1404efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1414efe37f4SJeremy Kerr { 1424efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1434efe37f4SJeremy Kerr 1444efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1454efe37f4SJeremy Kerr } 146f7ade2a6SJeremy Kerr 147f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 148f7ade2a6SJeremy Kerr { 149f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 150f7ade2a6SJeremy Kerr 151f6a2f8ebSJeremy Kerr of_node_put(device->dev.of_node); 152f7ade2a6SJeremy Kerr kfree(device); 153f7ade2a6SJeremy Kerr } 154f7ade2a6SJeremy Kerr 155f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 156f7ade2a6SJeremy Kerr { 157f7ade2a6SJeremy Kerr struct fsi_device *dev; 158f7ade2a6SJeremy Kerr 159f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 160f7ade2a6SJeremy Kerr if (!dev) 161f7ade2a6SJeremy Kerr return NULL; 162f7ade2a6SJeremy Kerr 163f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 164f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 165f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 166f7ade2a6SJeremy Kerr 167f7ade2a6SJeremy Kerr return dev; 168f7ade2a6SJeremy Kerr } 169f7ade2a6SJeremy Kerr 170414c1026SJeremy Kerr /* FSI slave support */ 171014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 172014c2abcSJeremy Kerr uint8_t *idp) 173014c2abcSJeremy Kerr { 174014c2abcSJeremy Kerr uint32_t addr = *addrp; 175014c2abcSJeremy Kerr uint8_t id = *idp; 176014c2abcSJeremy Kerr 177014c2abcSJeremy Kerr if (addr > slave->size) 178014c2abcSJeremy Kerr return -EINVAL; 179014c2abcSJeremy Kerr 180014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 181014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 182014c2abcSJeremy Kerr */ 183014c2abcSJeremy Kerr if (addr > 0x1fffff) { 184014c2abcSJeremy Kerr if (slave->id != 0) 185014c2abcSJeremy Kerr return -EINVAL; 186014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 187014c2abcSJeremy Kerr addr &= 0x1fffff; 188014c2abcSJeremy Kerr } 189014c2abcSJeremy Kerr 190014c2abcSJeremy Kerr *addrp = addr; 191014c2abcSJeremy Kerr *idp = id; 192014c2abcSJeremy Kerr return 0; 193014c2abcSJeremy Kerr } 194014c2abcSJeremy Kerr 195ed50a089SColin Ian King static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) 1961fa847d7SJeremy Kerr { 1971fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 19811454d6dSJoel Stanley __be32 irq, stat; 1991fa847d7SJeremy Kerr int rc, link; 2001fa847d7SJeremy Kerr uint8_t id; 2011fa847d7SJeremy Kerr 2021fa847d7SJeremy Kerr link = slave->link; 2031fa847d7SJeremy Kerr id = slave->id; 2041fa847d7SJeremy Kerr 2051fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2061fa847d7SJeremy Kerr &irq, sizeof(irq)); 2071fa847d7SJeremy Kerr if (rc) 2081fa847d7SJeremy Kerr return rc; 2091fa847d7SJeremy Kerr 2101fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, 2111fa847d7SJeremy Kerr &stat, sizeof(stat)); 2121fa847d7SJeremy Kerr if (rc) 2131fa847d7SJeremy Kerr return rc; 2141fa847d7SJeremy Kerr 215638bd9acSChristopher Bostic dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", 2161fa847d7SJeremy Kerr be32_to_cpu(stat), be32_to_cpu(irq)); 2171fa847d7SJeremy Kerr 2181fa847d7SJeremy Kerr /* clear interrupts */ 2191fa847d7SJeremy Kerr return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2201fa847d7SJeremy Kerr &irq, sizeof(irq)); 2211fa847d7SJeremy Kerr } 2221fa847d7SJeremy Kerr 223935f9636SBenjamin Herrenschmidt /* Encode slave local bus echo delay */ 224935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_echodly(int x) 225935f9636SBenjamin Herrenschmidt { 226935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 227935f9636SBenjamin Herrenschmidt } 228935f9636SBenjamin Herrenschmidt 229935f9636SBenjamin Herrenschmidt /* Encode slave local bus send delay */ 230935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_senddly(int x) 231935f9636SBenjamin Herrenschmidt { 232935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 233935f9636SBenjamin Herrenschmidt } 234935f9636SBenjamin Herrenschmidt 235935f9636SBenjamin Herrenschmidt /* Encode slave local bus clock rate ratio */ 236935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_lbcrr(int x) 237935f9636SBenjamin Herrenschmidt { 238935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 239935f9636SBenjamin Herrenschmidt } 240935f9636SBenjamin Herrenschmidt 241935f9636SBenjamin Herrenschmidt /* Encode slave ID */ 242935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_sid(int x) 243935f9636SBenjamin Herrenschmidt { 244935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 245935f9636SBenjamin Herrenschmidt } 246935f9636SBenjamin Herrenschmidt 247a2e7da86SBenjamin Herrenschmidt static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly) 248935f9636SBenjamin Herrenschmidt { 249935f9636SBenjamin Herrenschmidt return FSI_SMODE_WSC | FSI_SMODE_ECRC 250935f9636SBenjamin Herrenschmidt | fsi_smode_sid(id) 251a2e7da86SBenjamin Herrenschmidt | fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1) 252935f9636SBenjamin Herrenschmidt | fsi_smode_lbcrr(0x8); 253935f9636SBenjamin Herrenschmidt } 254935f9636SBenjamin Herrenschmidt 255a2e7da86SBenjamin Herrenschmidt static int fsi_slave_set_smode(struct fsi_slave *slave) 256935f9636SBenjamin Herrenschmidt { 257935f9636SBenjamin Herrenschmidt uint32_t smode; 258935f9636SBenjamin Herrenschmidt __be32 data; 259935f9636SBenjamin Herrenschmidt 260935f9636SBenjamin Herrenschmidt /* set our smode register with the slave ID field to 0; this enables 261935f9636SBenjamin Herrenschmidt * extended slave addressing 262935f9636SBenjamin Herrenschmidt */ 263a2e7da86SBenjamin Herrenschmidt smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay); 264935f9636SBenjamin Herrenschmidt data = cpu_to_be32(smode); 265935f9636SBenjamin Herrenschmidt 266a2e7da86SBenjamin Herrenschmidt return fsi_master_write(slave->master, slave->link, slave->id, 267a2e7da86SBenjamin Herrenschmidt FSI_SLAVE_BASE + FSI_SMODE, 268935f9636SBenjamin Herrenschmidt &data, sizeof(data)); 269935f9636SBenjamin Herrenschmidt } 2701fa847d7SJeremy Kerr 271ed50a089SColin Ian King static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, 272ed50a089SColin Ian King uint32_t addr, size_t size) 2731fa847d7SJeremy Kerr { 2741fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 2751fa847d7SJeremy Kerr int rc, link; 2761fa847d7SJeremy Kerr uint32_t reg; 277a2e7da86SBenjamin Herrenschmidt uint8_t id, send_delay, echo_delay; 2781fa847d7SJeremy Kerr 2791fa847d7SJeremy Kerr if (discard_errors) 2801fa847d7SJeremy Kerr return -1; 2811fa847d7SJeremy Kerr 2821fa847d7SJeremy Kerr link = slave->link; 2831fa847d7SJeremy Kerr id = slave->id; 2841fa847d7SJeremy Kerr 2851fa847d7SJeremy Kerr dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", 2861fa847d7SJeremy Kerr write ? "write" : "read", addr, size); 2871fa847d7SJeremy Kerr 2881fa847d7SJeremy Kerr /* try a simple clear of error conditions, which may fail if we've lost 2891fa847d7SJeremy Kerr * communication with the slave 2901fa847d7SJeremy Kerr */ 2911fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 2921fa847d7SJeremy Kerr if (!rc) 2931fa847d7SJeremy Kerr return 0; 2941fa847d7SJeremy Kerr 2951fa847d7SJeremy Kerr /* send a TERM and retry */ 2961fa847d7SJeremy Kerr if (master->term) { 2971fa847d7SJeremy Kerr rc = master->term(master, link, id); 2981fa847d7SJeremy Kerr if (!rc) { 2991fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, 0, 3001fa847d7SJeremy Kerr ®, sizeof(reg)); 3011fa847d7SJeremy Kerr if (!rc) 3021fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 3031fa847d7SJeremy Kerr if (!rc) 3041fa847d7SJeremy Kerr return 0; 3051fa847d7SJeremy Kerr } 3061fa847d7SJeremy Kerr } 3071fa847d7SJeremy Kerr 308a2e7da86SBenjamin Herrenschmidt send_delay = slave->t_send_delay; 309a2e7da86SBenjamin Herrenschmidt echo_delay = slave->t_echo_delay; 310a2e7da86SBenjamin Herrenschmidt 3111fa847d7SJeremy Kerr /* getting serious, reset the slave via BREAK */ 3121fa847d7SJeremy Kerr rc = fsi_master_break(master, link); 3131fa847d7SJeremy Kerr if (rc) 3141fa847d7SJeremy Kerr return rc; 3151fa847d7SJeremy Kerr 316a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = send_delay; 317a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = echo_delay; 318a2e7da86SBenjamin Herrenschmidt 319a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 3201fa847d7SJeremy Kerr if (rc) 3211fa847d7SJeremy Kerr return rc; 3221fa847d7SJeremy Kerr 323a2e7da86SBenjamin Herrenschmidt if (master->link_config) 324a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 325a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 326a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 327a2e7da86SBenjamin Herrenschmidt 3281fa847d7SJeremy Kerr return fsi_slave_report_and_clear_errors(slave); 3291fa847d7SJeremy Kerr } 3301fa847d7SJeremy Kerr 331da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 332014c2abcSJeremy Kerr void *val, size_t size) 333014c2abcSJeremy Kerr { 334014c2abcSJeremy Kerr uint8_t id = slave->id; 3351fa847d7SJeremy Kerr int rc, err_rc, i; 336014c2abcSJeremy Kerr 337014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 338014c2abcSJeremy Kerr if (rc) 339014c2abcSJeremy Kerr return rc; 340014c2abcSJeremy Kerr 3411fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3421fa847d7SJeremy Kerr rc = fsi_master_read(slave->master, slave->link, 3431fa847d7SJeremy Kerr id, addr, val, size); 3441fa847d7SJeremy Kerr if (!rc) 3451fa847d7SJeremy Kerr break; 3461fa847d7SJeremy Kerr 3471fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, false, addr, size); 3481fa847d7SJeremy Kerr if (err_rc) 3491fa847d7SJeremy Kerr break; 3501fa847d7SJeremy Kerr } 3511fa847d7SJeremy Kerr 3521fa847d7SJeremy Kerr return rc; 353014c2abcSJeremy Kerr } 354da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 355014c2abcSJeremy Kerr 356da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 357014c2abcSJeremy Kerr const void *val, size_t size) 358014c2abcSJeremy Kerr { 359014c2abcSJeremy Kerr uint8_t id = slave->id; 3601fa847d7SJeremy Kerr int rc, err_rc, i; 361014c2abcSJeremy Kerr 362014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 363014c2abcSJeremy Kerr if (rc) 364014c2abcSJeremy Kerr return rc; 365014c2abcSJeremy Kerr 3661fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3671fa847d7SJeremy Kerr rc = fsi_master_write(slave->master, slave->link, 3681fa847d7SJeremy Kerr id, addr, val, size); 3691fa847d7SJeremy Kerr if (!rc) 3701fa847d7SJeremy Kerr break; 3711fa847d7SJeremy Kerr 3721fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, true, addr, size); 3731fa847d7SJeremy Kerr if (err_rc) 3741fa847d7SJeremy Kerr break; 3751fa847d7SJeremy Kerr } 3761fa847d7SJeremy Kerr 3771fa847d7SJeremy Kerr return rc; 378014c2abcSJeremy Kerr } 379da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 380da36cadfSJeremy Kerr 381362fbc83STom Rix int fsi_slave_claim_range(struct fsi_slave *slave, 382da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 383da36cadfSJeremy Kerr { 384da36cadfSJeremy Kerr if (addr + size < addr) 385da36cadfSJeremy Kerr return -EINVAL; 386da36cadfSJeremy Kerr 387da36cadfSJeremy Kerr if (addr + size > slave->size) 388da36cadfSJeremy Kerr return -EINVAL; 389da36cadfSJeremy Kerr 390da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 391da36cadfSJeremy Kerr return 0; 392da36cadfSJeremy Kerr } 393da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 394da36cadfSJeremy Kerr 395362fbc83STom Rix void fsi_slave_release_range(struct fsi_slave *slave, 396da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 397da36cadfSJeremy Kerr { 398da36cadfSJeremy Kerr } 399da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 400014c2abcSJeremy Kerr 401f6a2f8ebSJeremy Kerr static bool fsi_device_node_matches(struct device *dev, struct device_node *np, 402f6a2f8ebSJeremy Kerr uint32_t addr, uint32_t size) 403f6a2f8ebSJeremy Kerr { 40423ad7ec1SRob Herring u64 paddr, psize; 405f6a2f8ebSJeremy Kerr 40623ad7ec1SRob Herring if (of_property_read_reg(np, 0, &paddr, &psize)) 407f6a2f8ebSJeremy Kerr return false; 408f6a2f8ebSJeremy Kerr 40923ad7ec1SRob Herring if (paddr != addr) 410f6a2f8ebSJeremy Kerr return false; 411f6a2f8ebSJeremy Kerr 412f6a2f8ebSJeremy Kerr if (psize != size) { 413f6a2f8ebSJeremy Kerr dev_warn(dev, 41423ad7ec1SRob Herring "node %pOF matches probed address, but not size (got 0x%llx, expected 0x%x)", 41523ad7ec1SRob Herring np, psize, size); 416f6a2f8ebSJeremy Kerr } 417f6a2f8ebSJeremy Kerr 418f6a2f8ebSJeremy Kerr return true; 419f6a2f8ebSJeremy Kerr } 420f6a2f8ebSJeremy Kerr 421f6a2f8ebSJeremy Kerr /* Find a matching node for the slave engine at @address, using @size bytes 422f6a2f8ebSJeremy Kerr * of space. Returns NULL if not found, or a matching node with refcount 423f6a2f8ebSJeremy Kerr * already incremented. 424f6a2f8ebSJeremy Kerr */ 425f6a2f8ebSJeremy Kerr static struct device_node *fsi_device_find_of_node(struct fsi_device *dev) 426f6a2f8ebSJeremy Kerr { 427f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 428f6a2f8ebSJeremy Kerr 429f6a2f8ebSJeremy Kerr parent = dev_of_node(&dev->slave->dev); 430f6a2f8ebSJeremy Kerr if (!parent) 431f6a2f8ebSJeremy Kerr return NULL; 432f6a2f8ebSJeremy Kerr 433f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 434f6a2f8ebSJeremy Kerr if (fsi_device_node_matches(&dev->dev, np, 435f6a2f8ebSJeremy Kerr dev->addr, dev->size)) 436f6a2f8ebSJeremy Kerr return np; 437f6a2f8ebSJeremy Kerr } 438f6a2f8ebSJeremy Kerr 439f6a2f8ebSJeremy Kerr return NULL; 440f6a2f8ebSJeremy Kerr } 441f6a2f8ebSJeremy Kerr 442f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 443f7ade2a6SJeremy Kerr { 444f7ade2a6SJeremy Kerr uint32_t engine_addr; 445f7ade2a6SJeremy Kerr int rc, i; 446f7ade2a6SJeremy Kerr 447f7ade2a6SJeremy Kerr /* 448f7ade2a6SJeremy Kerr * scan engines 449f7ade2a6SJeremy Kerr * 450f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 451f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 452f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 453f7ade2a6SJeremy Kerr */ 454f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 455f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 456f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 457f7ade2a6SJeremy Kerr struct fsi_device *dev; 45811454d6dSJoel Stanley uint32_t conf; 45911454d6dSJoel Stanley __be32 data; 460f7ade2a6SJeremy Kerr 46111454d6dSJoel Stanley rc = fsi_slave_read(slave, (i + 1) * sizeof(data), 46211454d6dSJoel Stanley &data, sizeof(data)); 463f7ade2a6SJeremy Kerr if (rc) { 464f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 465f7ade2a6SJeremy Kerr "error reading slave registers\n"); 466f7ade2a6SJeremy Kerr return -1; 467f7ade2a6SJeremy Kerr } 46811454d6dSJoel Stanley conf = be32_to_cpu(data); 469f7ade2a6SJeremy Kerr 470f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 471f7ade2a6SJeremy Kerr if (crc) { 472f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 473f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 474f7ade2a6SJeremy Kerr i); 475f7ade2a6SJeremy Kerr return -1; 476f7ade2a6SJeremy Kerr } 477f7ade2a6SJeremy Kerr 478f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 479f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 480f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 481f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 482f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 483f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 484f7ade2a6SJeremy Kerr 485f7ade2a6SJeremy Kerr /* 486f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 487f7ade2a6SJeremy Kerr * skips the defined address areas 488f7ade2a6SJeremy Kerr */ 489f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 490f7ade2a6SJeremy Kerr 491f7ade2a6SJeremy Kerr /* create device */ 492f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 493f7ade2a6SJeremy Kerr if (!dev) 494f7ade2a6SJeremy Kerr return -ENOMEM; 495f7ade2a6SJeremy Kerr 496f7ade2a6SJeremy Kerr dev->slave = slave; 497f7ade2a6SJeremy Kerr dev->engine_type = type; 498f7ade2a6SJeremy Kerr dev->version = version; 499f7ade2a6SJeremy Kerr dev->unit = i; 500f7ade2a6SJeremy Kerr dev->addr = engine_addr; 501f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 502f7ade2a6SJeremy Kerr 503f2af60bbSEddie James trace_fsi_dev_init(dev); 504f2af60bbSEddie James 505f7ade2a6SJeremy Kerr dev_dbg(&slave->dev, 506f7ade2a6SJeremy Kerr "engine[%i]: type %x, version %x, addr %x size %x\n", 507f7ade2a6SJeremy Kerr dev->unit, dev->engine_type, version, 508f7ade2a6SJeremy Kerr dev->addr, dev->size); 509f7ade2a6SJeremy Kerr 510f7ade2a6SJeremy Kerr dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", 511f7ade2a6SJeremy Kerr slave->master->idx, slave->link, 512f7ade2a6SJeremy Kerr slave->id, i - 2); 513f6a2f8ebSJeremy Kerr dev->dev.of_node = fsi_device_find_of_node(dev); 514f7ade2a6SJeremy Kerr 515f7ade2a6SJeremy Kerr rc = device_register(&dev->dev); 516f7ade2a6SJeremy Kerr if (rc) { 517f7ade2a6SJeremy Kerr dev_warn(&slave->dev, "add failed: %d\n", rc); 518f7ade2a6SJeremy Kerr put_device(&dev->dev); 519f7ade2a6SJeremy Kerr } 520f7ade2a6SJeremy Kerr } 521f7ade2a6SJeremy Kerr 522f7ade2a6SJeremy Kerr engine_addr += slots * engine_page_size; 523f7ade2a6SJeremy Kerr 524f7ade2a6SJeremy Kerr if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) 525f7ade2a6SJeremy Kerr break; 526f7ade2a6SJeremy Kerr } 527f7ade2a6SJeremy Kerr 528f7ade2a6SJeremy Kerr return 0; 529f7ade2a6SJeremy Kerr } 530f7ade2a6SJeremy Kerr 5319f4c2b51SAndrew Jeffery static unsigned long aligned_access_size(size_t offset, size_t count) 5329f4c2b51SAndrew Jeffery { 5339f4c2b51SAndrew Jeffery unsigned long offset_unit, count_unit; 5349f4c2b51SAndrew Jeffery 5359f4c2b51SAndrew Jeffery /* Criteria: 5369f4c2b51SAndrew Jeffery * 5379f4c2b51SAndrew Jeffery * 1. Access size must be less than or equal to the maximum access 5389f4c2b51SAndrew Jeffery * width or the highest power-of-two factor of offset 5399f4c2b51SAndrew Jeffery * 2. Access size must be less than or equal to the amount specified by 5409f4c2b51SAndrew Jeffery * count 5419f4c2b51SAndrew Jeffery * 5429f4c2b51SAndrew Jeffery * The access width is optimal if we can calculate 1 to be strictly 5439f4c2b51SAndrew Jeffery * equal while still satisfying 2. 5449f4c2b51SAndrew Jeffery */ 5459f4c2b51SAndrew Jeffery 5469f4c2b51SAndrew Jeffery /* Find 1 by the bottom bit of offset (with a 4 byte access cap) */ 5479f4c2b51SAndrew Jeffery offset_unit = BIT(__builtin_ctzl(offset | 4)); 5489f4c2b51SAndrew Jeffery 5499f4c2b51SAndrew Jeffery /* Find 2 by the top bit of count */ 5509f4c2b51SAndrew Jeffery count_unit = BIT(8 * sizeof(unsigned long) - 1 - __builtin_clzl(count)); 5519f4c2b51SAndrew Jeffery 5529f4c2b51SAndrew Jeffery /* Constrain the maximum access width to the minimum of both criteria */ 5539f4c2b51SAndrew Jeffery return BIT(__builtin_ctzl(offset_unit | count_unit)); 5549f4c2b51SAndrew Jeffery } 5559f4c2b51SAndrew Jeffery 556125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 557125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 558125739cbSJeremy Kerr loff_t off, size_t count) 559125739cbSJeremy Kerr { 560125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 561125739cbSJeremy Kerr size_t total_len, read_len; 562125739cbSJeremy Kerr int rc; 563125739cbSJeremy Kerr 564125739cbSJeremy Kerr if (off < 0) 565125739cbSJeremy Kerr return -EINVAL; 566125739cbSJeremy Kerr 567125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 568125739cbSJeremy Kerr return -EINVAL; 569125739cbSJeremy Kerr 570125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += read_len) { 5719f4c2b51SAndrew Jeffery read_len = aligned_access_size(off, count - total_len); 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) { 5989f4c2b51SAndrew Jeffery write_len = aligned_access_size(off, count - total_len); 599125739cbSJeremy Kerr 600125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 601125739cbSJeremy Kerr if (rc) 602125739cbSJeremy Kerr return rc; 603125739cbSJeremy Kerr 604125739cbSJeremy Kerr off += write_len; 605125739cbSJeremy Kerr } 606125739cbSJeremy Kerr 607125739cbSJeremy Kerr return count; 608125739cbSJeremy Kerr } 609125739cbSJeremy Kerr 610061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_raw_attr = { 611125739cbSJeremy Kerr .attr = { 612125739cbSJeremy Kerr .name = "raw", 613125739cbSJeremy Kerr .mode = 0600, 614125739cbSJeremy Kerr }, 615125739cbSJeremy Kerr .size = 0, 616125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 617125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 618125739cbSJeremy Kerr }; 619125739cbSJeremy Kerr 6202b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 6212b545cd8SJeremy Kerr { 6222b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 6232b545cd8SJeremy Kerr 6240ab5fe53SBenjamin Herrenschmidt fsi_free_minor(slave->dev.devt); 625f6a2f8ebSJeremy Kerr of_node_put(dev->of_node); 6262b545cd8SJeremy Kerr kfree(slave); 6272b545cd8SJeremy Kerr } 6282b545cd8SJeremy Kerr 629f6a2f8ebSJeremy Kerr static bool fsi_slave_node_matches(struct device_node *np, 630f6a2f8ebSJeremy Kerr int link, uint8_t id) 631f6a2f8ebSJeremy Kerr { 63223ad7ec1SRob Herring u64 addr; 633f6a2f8ebSJeremy Kerr 63423ad7ec1SRob Herring if (of_property_read_reg(np, 0, &addr, NULL)) 635f6a2f8ebSJeremy Kerr return false; 636f6a2f8ebSJeremy Kerr 63723ad7ec1SRob Herring return addr == (((u64)link << 32) | id); 638f6a2f8ebSJeremy Kerr } 639f6a2f8ebSJeremy Kerr 640f6a2f8ebSJeremy Kerr /* Find a matching node for the slave at (link, id). Returns NULL if none 641f6a2f8ebSJeremy Kerr * found, or a matching node with refcount already incremented. 642f6a2f8ebSJeremy Kerr */ 643f6a2f8ebSJeremy Kerr static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, 644f6a2f8ebSJeremy Kerr int link, uint8_t id) 645f6a2f8ebSJeremy Kerr { 646f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 647f6a2f8ebSJeremy Kerr 648f6a2f8ebSJeremy Kerr parent = dev_of_node(&master->dev); 649f6a2f8ebSJeremy Kerr if (!parent) 650f6a2f8ebSJeremy Kerr return NULL; 651f6a2f8ebSJeremy Kerr 652f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 653f6a2f8ebSJeremy Kerr if (fsi_slave_node_matches(np, link, id)) 654f6a2f8ebSJeremy Kerr return np; 655f6a2f8ebSJeremy Kerr } 656f6a2f8ebSJeremy Kerr 657f6a2f8ebSJeremy Kerr return NULL; 658f6a2f8ebSJeremy Kerr } 659f6a2f8ebSJeremy Kerr 660d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count, 661d1dcd678SBenjamin Herrenschmidt loff_t *offset) 662d1dcd678SBenjamin Herrenschmidt { 663d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 664d1dcd678SBenjamin Herrenschmidt size_t total_len, read_len; 665d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 666d1dcd678SBenjamin Herrenschmidt ssize_t rc; 667d1dcd678SBenjamin Herrenschmidt 668d1dcd678SBenjamin Herrenschmidt if (off < 0) 669d1dcd678SBenjamin Herrenschmidt return -EINVAL; 670d1dcd678SBenjamin Herrenschmidt 671d1dcd678SBenjamin Herrenschmidt if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 672d1dcd678SBenjamin Herrenschmidt return -EINVAL; 673d1dcd678SBenjamin Herrenschmidt 674d1dcd678SBenjamin Herrenschmidt for (total_len = 0; total_len < count; total_len += read_len) { 675d1dcd678SBenjamin Herrenschmidt __be32 data; 676d1dcd678SBenjamin Herrenschmidt 677d1dcd678SBenjamin Herrenschmidt read_len = min_t(size_t, count, 4); 678d1dcd678SBenjamin Herrenschmidt read_len -= off & 0x3; 679d1dcd678SBenjamin Herrenschmidt 680d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_read(slave, off, &data, read_len); 681d1dcd678SBenjamin Herrenschmidt if (rc) 682d1dcd678SBenjamin Herrenschmidt goto fail; 683d1dcd678SBenjamin Herrenschmidt rc = copy_to_user(buf + total_len, &data, read_len); 684d1dcd678SBenjamin Herrenschmidt if (rc) { 685d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 686d1dcd678SBenjamin Herrenschmidt goto fail; 687d1dcd678SBenjamin Herrenschmidt } 688d1dcd678SBenjamin Herrenschmidt off += read_len; 689d1dcd678SBenjamin Herrenschmidt } 690d1dcd678SBenjamin Herrenschmidt rc = count; 691d1dcd678SBenjamin Herrenschmidt fail: 692d1dcd678SBenjamin Herrenschmidt *offset = off; 69391081094SColin Ian King return rc; 694d1dcd678SBenjamin Herrenschmidt } 695d1dcd678SBenjamin Herrenschmidt 696d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_write(struct file *filep, const char __user *buf, 697d1dcd678SBenjamin Herrenschmidt size_t count, loff_t *offset) 698d1dcd678SBenjamin Herrenschmidt { 699d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 700d1dcd678SBenjamin Herrenschmidt size_t total_len, write_len; 701d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 702d1dcd678SBenjamin Herrenschmidt ssize_t rc; 703d1dcd678SBenjamin Herrenschmidt 704d1dcd678SBenjamin Herrenschmidt 705d1dcd678SBenjamin Herrenschmidt if (off < 0) 706d1dcd678SBenjamin Herrenschmidt return -EINVAL; 707d1dcd678SBenjamin Herrenschmidt 708d1dcd678SBenjamin Herrenschmidt if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 709d1dcd678SBenjamin Herrenschmidt return -EINVAL; 710d1dcd678SBenjamin Herrenschmidt 711d1dcd678SBenjamin Herrenschmidt for (total_len = 0; total_len < count; total_len += write_len) { 712d1dcd678SBenjamin Herrenschmidt __be32 data; 713d1dcd678SBenjamin Herrenschmidt 714d1dcd678SBenjamin Herrenschmidt write_len = min_t(size_t, count, 4); 715d1dcd678SBenjamin Herrenschmidt write_len -= off & 0x3; 716d1dcd678SBenjamin Herrenschmidt 717d1dcd678SBenjamin Herrenschmidt rc = copy_from_user(&data, buf + total_len, write_len); 718d1dcd678SBenjamin Herrenschmidt if (rc) { 719d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 720d1dcd678SBenjamin Herrenschmidt goto fail; 721d1dcd678SBenjamin Herrenschmidt } 722d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_write(slave, off, &data, write_len); 723d1dcd678SBenjamin Herrenschmidt if (rc) 724d1dcd678SBenjamin Herrenschmidt goto fail; 725d1dcd678SBenjamin Herrenschmidt off += write_len; 726d1dcd678SBenjamin Herrenschmidt } 727d1dcd678SBenjamin Herrenschmidt rc = count; 728d1dcd678SBenjamin Herrenschmidt fail: 729d1dcd678SBenjamin Herrenschmidt *offset = off; 73091081094SColin Ian King return rc; 731d1dcd678SBenjamin Herrenschmidt } 732d1dcd678SBenjamin Herrenschmidt 733d1dcd678SBenjamin Herrenschmidt static loff_t cfam_llseek(struct file *file, loff_t offset, int whence) 734d1dcd678SBenjamin Herrenschmidt { 735d1dcd678SBenjamin Herrenschmidt switch (whence) { 736d1dcd678SBenjamin Herrenschmidt case SEEK_CUR: 737d1dcd678SBenjamin Herrenschmidt break; 738d1dcd678SBenjamin Herrenschmidt case SEEK_SET: 739d1dcd678SBenjamin Herrenschmidt file->f_pos = offset; 740d1dcd678SBenjamin Herrenschmidt break; 741d1dcd678SBenjamin Herrenschmidt default: 742d1dcd678SBenjamin Herrenschmidt return -EINVAL; 743d1dcd678SBenjamin Herrenschmidt } 744d1dcd678SBenjamin Herrenschmidt 745d1dcd678SBenjamin Herrenschmidt return offset; 746d1dcd678SBenjamin Herrenschmidt } 747d1dcd678SBenjamin Herrenschmidt 748d1dcd678SBenjamin Herrenschmidt static int cfam_open(struct inode *inode, struct file *file) 749d1dcd678SBenjamin Herrenschmidt { 750d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev); 751d1dcd678SBenjamin Herrenschmidt 752d1dcd678SBenjamin Herrenschmidt file->private_data = slave; 753d1dcd678SBenjamin Herrenschmidt 754d1dcd678SBenjamin Herrenschmidt return 0; 755d1dcd678SBenjamin Herrenschmidt } 756d1dcd678SBenjamin Herrenschmidt 757d1dcd678SBenjamin Herrenschmidt static const struct file_operations cfam_fops = { 758d1dcd678SBenjamin Herrenschmidt .owner = THIS_MODULE, 759d1dcd678SBenjamin Herrenschmidt .open = cfam_open, 760d1dcd678SBenjamin Herrenschmidt .llseek = cfam_llseek, 761d1dcd678SBenjamin Herrenschmidt .read = cfam_read, 762d1dcd678SBenjamin Herrenschmidt .write = cfam_write, 763d1dcd678SBenjamin Herrenschmidt }; 764d1dcd678SBenjamin Herrenschmidt 765d1dcd678SBenjamin Herrenschmidt static ssize_t send_term_store(struct device *dev, 766d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 767d1dcd678SBenjamin Herrenschmidt const char *buf, size_t count) 768d1dcd678SBenjamin Herrenschmidt { 769d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 770d1dcd678SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 771d1dcd678SBenjamin Herrenschmidt 772d1dcd678SBenjamin Herrenschmidt if (!master->term) 773d1dcd678SBenjamin Herrenschmidt return -ENODEV; 774d1dcd678SBenjamin Herrenschmidt 775d1dcd678SBenjamin Herrenschmidt master->term(master, slave->link, slave->id); 776d1dcd678SBenjamin Herrenschmidt return count; 777d1dcd678SBenjamin Herrenschmidt } 778d1dcd678SBenjamin Herrenschmidt 779d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_WO(send_term); 780d1dcd678SBenjamin Herrenschmidt 781a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_show(struct device *dev, 782a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, 783a2e7da86SBenjamin Herrenschmidt char *buf) 784a2e7da86SBenjamin Herrenschmidt { 785a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 786a2e7da86SBenjamin Herrenschmidt 787a2e7da86SBenjamin Herrenschmidt return sprintf(buf, "%u\n", slave->t_send_delay); 788a2e7da86SBenjamin Herrenschmidt } 789a2e7da86SBenjamin Herrenschmidt 790a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_store(struct device *dev, 791a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, const char *buf, size_t count) 792a2e7da86SBenjamin Herrenschmidt { 793a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 794a2e7da86SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 795a2e7da86SBenjamin Herrenschmidt unsigned long val; 796a2e7da86SBenjamin Herrenschmidt int rc; 797a2e7da86SBenjamin Herrenschmidt 798a2e7da86SBenjamin Herrenschmidt if (kstrtoul(buf, 0, &val) < 0) 799a2e7da86SBenjamin Herrenschmidt return -EINVAL; 800a2e7da86SBenjamin Herrenschmidt 801a2e7da86SBenjamin Herrenschmidt if (val < 1 || val > 16) 802a2e7da86SBenjamin Herrenschmidt return -EINVAL; 803a2e7da86SBenjamin Herrenschmidt 804a2e7da86SBenjamin Herrenschmidt if (!master->link_config) 805a2e7da86SBenjamin Herrenschmidt return -ENXIO; 806a2e7da86SBenjamin Herrenschmidt 807a2e7da86SBenjamin Herrenschmidt /* Current HW mandates that send and echo delay are identical */ 808a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = val; 809a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = val; 810a2e7da86SBenjamin Herrenschmidt 811a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 812a2e7da86SBenjamin Herrenschmidt if (rc < 0) 813a2e7da86SBenjamin Herrenschmidt return rc; 814a2e7da86SBenjamin Herrenschmidt if (master->link_config) 815a2e7da86SBenjamin Herrenschmidt master->link_config(master, slave->link, 816a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 817a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 818a2e7da86SBenjamin Herrenschmidt 819a2e7da86SBenjamin Herrenschmidt return count; 820a2e7da86SBenjamin Herrenschmidt } 821a2e7da86SBenjamin Herrenschmidt 822a2e7da86SBenjamin Herrenschmidt static DEVICE_ATTR(send_echo_delays, 0600, 823a2e7da86SBenjamin Herrenschmidt slave_send_echo_show, slave_send_echo_store); 824a2e7da86SBenjamin Herrenschmidt 8250a213777SBenjamin Herrenschmidt static ssize_t chip_id_show(struct device *dev, 8260a213777SBenjamin Herrenschmidt struct device_attribute *attr, 8270a213777SBenjamin Herrenschmidt char *buf) 8280a213777SBenjamin Herrenschmidt { 8290a213777SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 8300a213777SBenjamin Herrenschmidt 8310a213777SBenjamin Herrenschmidt return sprintf(buf, "%d\n", slave->chip_id); 8320a213777SBenjamin Herrenschmidt } 8330a213777SBenjamin Herrenschmidt 8340a213777SBenjamin Herrenschmidt static DEVICE_ATTR_RO(chip_id); 8350a213777SBenjamin Herrenschmidt 836d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_id_show(struct device *dev, 837d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 838d1dcd678SBenjamin Herrenschmidt char *buf) 839d1dcd678SBenjamin Herrenschmidt { 840d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 841d1dcd678SBenjamin Herrenschmidt 842d1dcd678SBenjamin Herrenschmidt return sprintf(buf, "0x%x\n", slave->cfam_id); 843d1dcd678SBenjamin Herrenschmidt } 844d1dcd678SBenjamin Herrenschmidt 845d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_RO(cfam_id); 846d1dcd678SBenjamin Herrenschmidt 847d1dcd678SBenjamin Herrenschmidt static struct attribute *cfam_attr[] = { 848d1dcd678SBenjamin Herrenschmidt &dev_attr_send_echo_delays.attr, 849d1dcd678SBenjamin Herrenschmidt &dev_attr_chip_id.attr, 850d1dcd678SBenjamin Herrenschmidt &dev_attr_cfam_id.attr, 851d1dcd678SBenjamin Herrenschmidt &dev_attr_send_term.attr, 852d1dcd678SBenjamin Herrenschmidt NULL, 853d1dcd678SBenjamin Herrenschmidt }; 854d1dcd678SBenjamin Herrenschmidt 855d1dcd678SBenjamin Herrenschmidt static const struct attribute_group cfam_attr_group = { 856d1dcd678SBenjamin Herrenschmidt .attrs = cfam_attr, 857d1dcd678SBenjamin Herrenschmidt }; 858d1dcd678SBenjamin Herrenschmidt 859d1dcd678SBenjamin Herrenschmidt static const struct attribute_group *cfam_attr_groups[] = { 860d1dcd678SBenjamin Herrenschmidt &cfam_attr_group, 861d1dcd678SBenjamin Herrenschmidt NULL, 862d1dcd678SBenjamin Herrenschmidt }; 863d1dcd678SBenjamin Herrenschmidt 864a9b12f8bSGreg Kroah-Hartman static char *cfam_devnode(const struct device *dev, umode_t *mode, 865d1dcd678SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 866d1dcd678SBenjamin Herrenschmidt { 867a9b12f8bSGreg Kroah-Hartman const struct fsi_slave *slave = to_fsi_slave(dev); 868d1dcd678SBenjamin Herrenschmidt 869d1dcd678SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 870d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx); 871d1dcd678SBenjamin Herrenschmidt #else 872d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx); 873d1dcd678SBenjamin Herrenschmidt #endif 874d1dcd678SBenjamin Herrenschmidt } 875d1dcd678SBenjamin Herrenschmidt 876d1dcd678SBenjamin Herrenschmidt static const struct device_type cfam_type = { 877d1dcd678SBenjamin Herrenschmidt .name = "cfam", 878d1dcd678SBenjamin Herrenschmidt .devnode = cfam_devnode, 879d1dcd678SBenjamin Herrenschmidt .groups = cfam_attr_groups 880d1dcd678SBenjamin Herrenschmidt }; 881d1dcd678SBenjamin Herrenschmidt 882a9b12f8bSGreg Kroah-Hartman static char *fsi_cdev_devnode(const struct device *dev, umode_t *mode, 8830ab5fe53SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 8840ab5fe53SBenjamin Herrenschmidt { 8850ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 8860ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev)); 8870ab5fe53SBenjamin Herrenschmidt #else 8880ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 8890ab5fe53SBenjamin Herrenschmidt #endif 8900ab5fe53SBenjamin Herrenschmidt } 8910ab5fe53SBenjamin Herrenschmidt 8920ab5fe53SBenjamin Herrenschmidt const struct device_type fsi_cdev_type = { 8930ab5fe53SBenjamin Herrenschmidt .name = "fsi-cdev", 8940ab5fe53SBenjamin Herrenschmidt .devnode = fsi_cdev_devnode, 8950ab5fe53SBenjamin Herrenschmidt }; 8960ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_cdev_type); 8970ab5fe53SBenjamin Herrenschmidt 8980ab5fe53SBenjamin Herrenschmidt /* Backward compatible /dev/ numbering in "old style" mode */ 8990ab5fe53SBenjamin Herrenschmidt static int fsi_adjust_index(int index) 9000ab5fe53SBenjamin Herrenschmidt { 9010ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 9020ab5fe53SBenjamin Herrenschmidt return index; 9030ab5fe53SBenjamin Herrenschmidt #else 9040ab5fe53SBenjamin Herrenschmidt return index + 1; 9050ab5fe53SBenjamin Herrenschmidt #endif 9060ab5fe53SBenjamin Herrenschmidt } 9070ab5fe53SBenjamin Herrenschmidt 9080ab5fe53SBenjamin Herrenschmidt static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type, 9090ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9100ab5fe53SBenjamin Herrenschmidt { 9110ab5fe53SBenjamin Herrenschmidt int cid = slave->chip_id; 9120ab5fe53SBenjamin Herrenschmidt int id; 9130ab5fe53SBenjamin Herrenschmidt 9140ab5fe53SBenjamin Herrenschmidt /* Check if we qualify for legacy numbering */ 9150ab5fe53SBenjamin Herrenschmidt if (cid >= 0 && cid < 16 && type < 4) { 9160ab5fe53SBenjamin Herrenschmidt /* Try reserving the legacy number */ 9170ab5fe53SBenjamin Herrenschmidt id = (cid << 4) | type; 9180ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); 9190ab5fe53SBenjamin Herrenschmidt if (id >= 0) { 9200ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(cid); 9210ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9220ab5fe53SBenjamin Herrenschmidt return 0; 9230ab5fe53SBenjamin Herrenschmidt } 9240ab5fe53SBenjamin Herrenschmidt /* Other failure */ 9250ab5fe53SBenjamin Herrenschmidt if (id != -ENOSPC) 9260ab5fe53SBenjamin Herrenschmidt return id; 9270ab5fe53SBenjamin Herrenschmidt /* Fallback to non-legacy allocation */ 9280ab5fe53SBenjamin Herrenschmidt } 9290ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP, 9300ab5fe53SBenjamin Herrenschmidt FSI_CHAR_MAX_DEVICES, GFP_KERNEL); 9310ab5fe53SBenjamin Herrenschmidt if (id < 0) 9320ab5fe53SBenjamin Herrenschmidt return id; 9330ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(id); 9340ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9350ab5fe53SBenjamin Herrenschmidt return 0; 9360ab5fe53SBenjamin Herrenschmidt } 9370ab5fe53SBenjamin Herrenschmidt 93821930d80SEddie James static const char *const fsi_dev_type_names[] = { 93921930d80SEddie James "cfam", 94021930d80SEddie James "sbefifo", 94121930d80SEddie James "scom", 94221930d80SEddie James "occ", 94321930d80SEddie James }; 94421930d80SEddie James 9450ab5fe53SBenjamin Herrenschmidt int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type, 9460ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9470ab5fe53SBenjamin Herrenschmidt { 94821930d80SEddie James if (fdev->dev.of_node) { 94921930d80SEddie James int aid = of_alias_get_id(fdev->dev.of_node, fsi_dev_type_names[type]); 95021930d80SEddie James 95121930d80SEddie James if (aid >= 0) { 95221930d80SEddie James int id = (aid << 4) | type; 95321930d80SEddie James 95421930d80SEddie James id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); 95521930d80SEddie James if (id >= 0) { 95621930d80SEddie James *out_index = aid; 95721930d80SEddie James *out_dev = fsi_base_dev + id; 95821930d80SEddie James return 0; 95921930d80SEddie James } 96021930d80SEddie James 96121930d80SEddie James if (id != -ENOSPC) 96221930d80SEddie James return id; 96321930d80SEddie James } 96421930d80SEddie James } 96521930d80SEddie James 9660ab5fe53SBenjamin Herrenschmidt return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index); 9670ab5fe53SBenjamin Herrenschmidt } 9680ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_get_new_minor); 9690ab5fe53SBenjamin Herrenschmidt 9700ab5fe53SBenjamin Herrenschmidt void fsi_free_minor(dev_t dev) 9710ab5fe53SBenjamin Herrenschmidt { 9720ab5fe53SBenjamin Herrenschmidt ida_simple_remove(&fsi_minor_ida, MINOR(dev)); 9730ab5fe53SBenjamin Herrenschmidt } 9740ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_free_minor); 9750ab5fe53SBenjamin Herrenschmidt 976414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 977414c1026SJeremy Kerr { 978d1dcd678SBenjamin Herrenschmidt uint32_t cfam_id; 9792b545cd8SJeremy Kerr struct fsi_slave *slave; 9802b545cd8SJeremy Kerr uint8_t crc; 981196964a3SEddie James __be32 data, llmode, slbus; 9822b545cd8SJeremy Kerr int rc; 983414c1026SJeremy Kerr 9842b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 9852b545cd8SJeremy Kerr * full 23-bit address range 9862b545cd8SJeremy Kerr */ 9872b545cd8SJeremy Kerr if (id != 0) 9882b545cd8SJeremy Kerr return -EINVAL; 9892b545cd8SJeremy Kerr 99011454d6dSJoel Stanley rc = fsi_master_read(master, link, id, 0, &data, sizeof(data)); 9912b545cd8SJeremy Kerr if (rc) { 9922b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 9932b545cd8SJeremy Kerr link, id, rc); 994414c1026SJeremy Kerr return -ENODEV; 995414c1026SJeremy Kerr } 996d1dcd678SBenjamin Herrenschmidt cfam_id = be32_to_cpu(data); 9972b545cd8SJeremy Kerr 998d1dcd678SBenjamin Herrenschmidt crc = crc4(0, cfam_id, 32); 9992b545cd8SJeremy Kerr if (crc) { 1000f2af60bbSEddie James trace_fsi_slave_invalid_cfam(master, link, cfam_id); 1001d1dcd678SBenjamin Herrenschmidt dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n", 10022b545cd8SJeremy Kerr link, id); 10032b545cd8SJeremy Kerr return -EIO; 10042b545cd8SJeremy Kerr } 10052b545cd8SJeremy Kerr 1006638bd9acSChristopher Bostic dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 1007d1dcd678SBenjamin Herrenschmidt cfam_id, master->idx, link, id); 10082b545cd8SJeremy Kerr 10094af889b0SJeremy Kerr /* If we're behind a master that doesn't provide a self-running bus 10104af889b0SJeremy Kerr * clock, put the slave into async mode 10114af889b0SJeremy Kerr */ 10124af889b0SJeremy Kerr if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { 10134af889b0SJeremy Kerr llmode = cpu_to_be32(FSI_LLMODE_ASYNC); 10144af889b0SJeremy Kerr rc = fsi_master_write(master, link, id, 10154af889b0SJeremy Kerr FSI_SLAVE_BASE + FSI_LLMODE, 10164af889b0SJeremy Kerr &llmode, sizeof(llmode)); 10174af889b0SJeremy Kerr if (rc) 10184af889b0SJeremy Kerr dev_warn(&master->dev, 10194af889b0SJeremy Kerr "can't set llmode on slave:%02x:%02x %d\n", 10204af889b0SJeremy Kerr link, id, rc); 10214af889b0SJeremy Kerr } 10224af889b0SJeremy Kerr 10232b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 10242b545cd8SJeremy Kerr * register. 10252b545cd8SJeremy Kerr */ 10262b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 10272b545cd8SJeremy Kerr if (!slave) 10282b545cd8SJeremy Kerr return -ENOMEM; 10292b545cd8SJeremy Kerr 1030d1dcd678SBenjamin Herrenschmidt dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 1031d1dcd678SBenjamin Herrenschmidt slave->dev.type = &cfam_type; 10322b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 1033f6a2f8ebSJeremy Kerr slave->dev.of_node = fsi_slave_find_of_node(master, link, id); 10342b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 1035d1dcd678SBenjamin Herrenschmidt device_initialize(&slave->dev); 1036d1dcd678SBenjamin Herrenschmidt slave->cfam_id = cfam_id; 1037d1dcd678SBenjamin Herrenschmidt slave->master = master; 10382b545cd8SJeremy Kerr slave->link = link; 10392b545cd8SJeremy Kerr slave->id = id; 10402b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 1041a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = 16; 1042a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = 16; 1043a2e7da86SBenjamin Herrenschmidt 10440a213777SBenjamin Herrenschmidt /* Get chip ID if any */ 10450a213777SBenjamin Herrenschmidt slave->chip_id = -1; 10460a213777SBenjamin Herrenschmidt if (slave->dev.of_node) { 10470a213777SBenjamin Herrenschmidt uint32_t prop; 10480a213777SBenjamin Herrenschmidt if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop)) 10490a213777SBenjamin Herrenschmidt slave->chip_id = prop; 10500a213777SBenjamin Herrenschmidt 10510a213777SBenjamin Herrenschmidt } 1052d1dcd678SBenjamin Herrenschmidt 1053196964a3SEddie James slbus = cpu_to_be32(FSI_SLBUS_FORCE); 1054196964a3SEddie James rc = fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SLBUS, 1055196964a3SEddie James &slbus, sizeof(slbus)); 1056196964a3SEddie James if (rc) 1057196964a3SEddie James dev_warn(&master->dev, 1058196964a3SEddie James "can't set slbus on slave:%02x:%02x %d\n", link, id, 1059196964a3SEddie James rc); 1060196964a3SEddie James 1061371975b0SJeremy Kerr rc = fsi_slave_set_smode(slave); 1062371975b0SJeremy Kerr if (rc) { 1063371975b0SJeremy Kerr dev_warn(&master->dev, 1064371975b0SJeremy Kerr "can't set smode on slave:%02x:%02x %d\n", 1065371975b0SJeremy Kerr link, id, rc); 1066371975b0SJeremy Kerr goto err_free; 1067371975b0SJeremy Kerr } 1068371975b0SJeremy Kerr 1069d1dcd678SBenjamin Herrenschmidt /* Allocate a minor in the FSI space */ 1070d1dcd678SBenjamin Herrenschmidt rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt, 1071d1dcd678SBenjamin Herrenschmidt &slave->cdev_idx); 1072d1dcd678SBenjamin Herrenschmidt if (rc) 1073d1dcd678SBenjamin Herrenschmidt goto err_free; 1074d1dcd678SBenjamin Herrenschmidt 1075f2af60bbSEddie James trace_fsi_slave_init(slave); 1076f2af60bbSEddie James 1077d1dcd678SBenjamin Herrenschmidt /* Create chardev for userspace access */ 1078d1dcd678SBenjamin Herrenschmidt cdev_init(&slave->cdev, &cfam_fops); 1079d1dcd678SBenjamin Herrenschmidt rc = cdev_device_add(&slave->cdev, &slave->dev); 1080d1dcd678SBenjamin Herrenschmidt if (rc) { 1081d1dcd678SBenjamin Herrenschmidt dev_err(&slave->dev, "Error %d creating slave device\n", rc); 1082371975b0SJeremy Kerr goto err_free_ida; 1083d1dcd678SBenjamin Herrenschmidt } 1084d1dcd678SBenjamin Herrenschmidt 1085371975b0SJeremy Kerr /* Now that we have the cdev registered with the core, any fatal 1086371975b0SJeremy Kerr * failures beyond this point will need to clean up through 1087371975b0SJeremy Kerr * cdev_device_del(). Fortunately though, nothing past here is fatal. 1088371975b0SJeremy Kerr */ 1089371975b0SJeremy Kerr 1090a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1091a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 1092a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 1093a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 10942b545cd8SJeremy Kerr 1095d1dcd678SBenjamin Herrenschmidt /* Legacy raw file -> to be removed */ 1096125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 1097125739cbSJeremy Kerr if (rc) 1098125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 1099125739cbSJeremy Kerr 11000a213777SBenjamin Herrenschmidt 1101f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 1102f7ade2a6SJeremy Kerr if (rc) 1103f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 1104f7ade2a6SJeremy Kerr rc); 11052b545cd8SJeremy Kerr 1106371975b0SJeremy Kerr return 0; 1107d1dcd678SBenjamin Herrenschmidt 1108371975b0SJeremy Kerr err_free_ida: 1109371975b0SJeremy Kerr fsi_free_minor(slave->dev.devt); 1110d1dcd678SBenjamin Herrenschmidt err_free: 1111371975b0SJeremy Kerr of_node_put(slave->dev.of_node); 1112371975b0SJeremy Kerr kfree(slave); 1113d1dcd678SBenjamin Herrenschmidt return rc; 11142b545cd8SJeremy Kerr } 1115414c1026SJeremy Kerr 111609aecfabSJeremy Kerr /* FSI master support */ 1117014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 1118014c2abcSJeremy Kerr { 111999f039e9SEddie James if (size == 4) { 112099f039e9SEddie James if (addr & 0x3) 1121014c2abcSJeremy Kerr return -EINVAL; 112299f039e9SEddie James } else if (size == 2) { 112399f039e9SEddie James if (addr & 0x1) 112499f039e9SEddie James return -EINVAL; 112599f039e9SEddie James } else if (size != 1) 1126014c2abcSJeremy Kerr return -EINVAL; 1127014c2abcSJeremy Kerr 1128014c2abcSJeremy Kerr return 0; 1129014c2abcSJeremy Kerr } 1130014c2abcSJeremy Kerr 1131014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 1132014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 1133014c2abcSJeremy Kerr { 1134014c2abcSJeremy Kerr int rc; 1135014c2abcSJeremy Kerr 113666433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 1137014c2abcSJeremy Kerr 113866433b05SJeremy Kerr rc = fsi_check_access(addr, size); 113966433b05SJeremy Kerr if (!rc) 114066433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 114166433b05SJeremy Kerr 114266433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 114366433b05SJeremy Kerr false, val, rc); 114466433b05SJeremy Kerr 114566433b05SJeremy Kerr return rc; 1146014c2abcSJeremy Kerr } 1147014c2abcSJeremy Kerr 1148014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 1149014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 1150014c2abcSJeremy Kerr { 1151014c2abcSJeremy Kerr int rc; 1152014c2abcSJeremy Kerr 115366433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 1154014c2abcSJeremy Kerr 115566433b05SJeremy Kerr rc = fsi_check_access(addr, size); 115666433b05SJeremy Kerr if (!rc) 115766433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 115866433b05SJeremy Kerr 115966433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 116066433b05SJeremy Kerr true, val, rc); 116166433b05SJeremy Kerr 116266433b05SJeremy Kerr return rc; 1163014c2abcSJeremy Kerr } 1164014c2abcSJeremy Kerr 1165b36875a4SEddie James static int fsi_master_link_disable(struct fsi_master *master, int link) 1166b36875a4SEddie James { 1167b36875a4SEddie James if (master->link_enable) 1168b36875a4SEddie James return master->link_enable(master, link, false); 1169b36875a4SEddie James 1170b36875a4SEddie James return 0; 1171b36875a4SEddie James } 1172b36875a4SEddie James 117326095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 117426095282SChristopher Bostic { 117526095282SChristopher Bostic if (master->link_enable) 117604635a30SEddie James return master->link_enable(master, link, true); 117726095282SChristopher Bostic 117826095282SChristopher Bostic return 0; 117926095282SChristopher Bostic } 118026095282SChristopher Bostic 118126095282SChristopher Bostic /* 118226095282SChristopher Bostic * Issue a break command on this link 118326095282SChristopher Bostic */ 118426095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 118526095282SChristopher Bostic { 1186a2e7da86SBenjamin Herrenschmidt int rc = 0; 1187a2e7da86SBenjamin Herrenschmidt 118866433b05SJeremy Kerr trace_fsi_master_break(master, link); 118966433b05SJeremy Kerr 119026095282SChristopher Bostic if (master->send_break) 1191a2e7da86SBenjamin Herrenschmidt rc = master->send_break(master, link); 1192a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1193a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 16, 16); 119426095282SChristopher Bostic 1195a2e7da86SBenjamin Herrenschmidt return rc; 119626095282SChristopher Bostic } 119726095282SChristopher Bostic 1198414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 1199414c1026SJeremy Kerr { 120026095282SChristopher Bostic int link, rc; 1201414c1026SJeremy Kerr 1202*02c8fec0SEddie James trace_fsi_master_scan(master, true); 120326095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 120426095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 120526095282SChristopher Bostic if (rc) { 120626095282SChristopher Bostic dev_dbg(&master->dev, 120726095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 120826095282SChristopher Bostic continue; 120926095282SChristopher Bostic } 121026095282SChristopher Bostic rc = fsi_master_break(master, link); 121126095282SChristopher Bostic if (rc) { 1212b36875a4SEddie James fsi_master_link_disable(master, link); 121326095282SChristopher Bostic dev_dbg(&master->dev, 121426095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 121526095282SChristopher Bostic continue; 121626095282SChristopher Bostic } 121726095282SChristopher Bostic 1218b36875a4SEddie James rc = fsi_slave_init(master, link, 0); 1219b36875a4SEddie James if (rc) 1220b36875a4SEddie James fsi_master_link_disable(master, link); 122126095282SChristopher Bostic } 1222414c1026SJeremy Kerr 1223414c1026SJeremy Kerr return 0; 1224414c1026SJeremy Kerr } 1225414c1026SJeremy Kerr 1226cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 1227cd0fdb5cSChristopher Bostic { 1228cd0fdb5cSChristopher Bostic device_unregister(dev); 1229cd0fdb5cSChristopher Bostic return 0; 1230cd0fdb5cSChristopher Bostic } 1231cd0fdb5cSChristopher Bostic 1232cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 1233cd0fdb5cSChristopher Bostic { 1234d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 1235d1dcd678SBenjamin Herrenschmidt 1236cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 1237d1dcd678SBenjamin Herrenschmidt cdev_device_del(&slave->cdev, &slave->dev); 12380ab5fe53SBenjamin Herrenschmidt put_device(dev); 1239cd0fdb5cSChristopher Bostic return 0; 1240cd0fdb5cSChristopher Bostic } 1241cd0fdb5cSChristopher Bostic 1242cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 1243cd0fdb5cSChristopher Bostic { 1244*02c8fec0SEddie James trace_fsi_master_scan(master, false); 1245cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 1246cd0fdb5cSChristopher Bostic } 1247cd0fdb5cSChristopher Bostic 124815362d69SJeremy Kerr int fsi_master_rescan(struct fsi_master *master) 124915362d69SJeremy Kerr { 12509840fcd8SBenjamin Herrenschmidt int rc; 12519840fcd8SBenjamin Herrenschmidt 12529840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 125315362d69SJeremy Kerr fsi_master_unscan(master); 12549840fcd8SBenjamin Herrenschmidt rc = fsi_master_scan(master); 12559840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 12569840fcd8SBenjamin Herrenschmidt 12579840fcd8SBenjamin Herrenschmidt return rc; 125815362d69SJeremy Kerr } 125915362d69SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_rescan); 126015362d69SJeremy Kerr 1261cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 1262cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 1263cd0fdb5cSChristopher Bostic { 1264cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 1265cd0fdb5cSChristopher Bostic int rc; 1266cd0fdb5cSChristopher Bostic 126715362d69SJeremy Kerr rc = fsi_master_rescan(master); 1268cd0fdb5cSChristopher Bostic if (rc < 0) 1269cd0fdb5cSChristopher Bostic return rc; 1270cd0fdb5cSChristopher Bostic 1271cd0fdb5cSChristopher Bostic return count; 1272cd0fdb5cSChristopher Bostic } 1273cd0fdb5cSChristopher Bostic 1274cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 1275cd0fdb5cSChristopher Bostic 1276125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 1277125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 1278125739cbSJeremy Kerr { 1279125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 1280125739cbSJeremy Kerr 1281125739cbSJeremy Kerr fsi_master_break(master, 0); 1282125739cbSJeremy Kerr 1283125739cbSJeremy Kerr return count; 1284125739cbSJeremy Kerr } 1285125739cbSJeremy Kerr 1286125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 1287125739cbSJeremy Kerr 1288cf700ba0SJeremy Kerr static struct attribute *master_attrs[] = { 1289cf700ba0SJeremy Kerr &dev_attr_break.attr, 1290cf700ba0SJeremy Kerr &dev_attr_rescan.attr, 1291cf700ba0SJeremy Kerr NULL 1292cf700ba0SJeremy Kerr }; 1293cf700ba0SJeremy Kerr 1294cf700ba0SJeremy Kerr ATTRIBUTE_GROUPS(master); 1295cf700ba0SJeremy Kerr 129656ec311fSkbuild test robot static struct class fsi_master_class = { 12972e32c2d6SJeremy Kerr .name = "fsi-master", 1298cf700ba0SJeremy Kerr .dev_groups = master_groups, 12992e32c2d6SJeremy Kerr }; 13002e32c2d6SJeremy Kerr 130109aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 130209aecfabSJeremy Kerr { 130309aecfabSJeremy Kerr int rc; 1304f3aa2c6fSChristopher Bostic struct device_node *np; 130509aecfabSJeremy Kerr 13069840fcd8SBenjamin Herrenschmidt mutex_init(&master->scan_lock); 130709aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 130835af9fb4SJiasheng Jiang if (master->idx < 0) 130935af9fb4SJiasheng Jiang return master->idx; 131035af9fb4SJiasheng Jiang 131109aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 13122e32c2d6SJeremy Kerr master->dev.class = &fsi_master_class; 131309aecfabSJeremy Kerr 131409aecfabSJeremy Kerr rc = device_register(&master->dev); 1315414c1026SJeremy Kerr if (rc) { 131609aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 131709aecfabSJeremy Kerr return rc; 131809aecfabSJeremy Kerr } 1319414c1026SJeremy Kerr 1320f3aa2c6fSChristopher Bostic np = dev_of_node(&master->dev); 13219840fcd8SBenjamin Herrenschmidt if (!of_property_read_bool(np, "no-scan-on-init")) { 13229840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 1323414c1026SJeremy Kerr fsi_master_scan(master); 13249840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 13259840fcd8SBenjamin Herrenschmidt } 1326cd0fdb5cSChristopher Bostic 1327414c1026SJeremy Kerr return 0; 1328414c1026SJeremy Kerr } 132909aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 133009aecfabSJeremy Kerr 133109aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 133209aecfabSJeremy Kerr { 1333*02c8fec0SEddie James trace_fsi_master_unregister(master); 1334*02c8fec0SEddie James 133509aecfabSJeremy Kerr if (master->idx >= 0) { 133609aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 133709aecfabSJeremy Kerr master->idx = -1; 133809aecfabSJeremy Kerr } 133909aecfabSJeremy Kerr 13409840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 1341cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 13429840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 134309aecfabSJeremy Kerr device_unregister(&master->dev); 134409aecfabSJeremy Kerr } 134509aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 134609aecfabSJeremy Kerr 13470508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 13480508ad1fSJeremy Kerr 1349dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 1350dd37eed7SJeremy Kerr { 1351dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 1352dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 1353dd37eed7SJeremy Kerr const struct fsi_device_id *id; 1354dd37eed7SJeremy Kerr 1355dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 1356dd37eed7SJeremy Kerr return 0; 1357dd37eed7SJeremy Kerr 1358dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 1359dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 1360dd37eed7SJeremy Kerr continue; 1361dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 1362c21d322eSEddie James id->version == fsi_dev->version) { 1363c21d322eSEddie James if (drv->of_match_table) { 1364c21d322eSEddie James if (of_driver_match_device(dev, drv)) 1365dd37eed7SJeremy Kerr return 1; 1366c21d322eSEddie James } else { 1367c21d322eSEddie James return 1; 1368c21d322eSEddie James } 1369c21d322eSEddie James } 1370dd37eed7SJeremy Kerr } 1371dd37eed7SJeremy Kerr 1372dd37eed7SJeremy Kerr return 0; 1373dd37eed7SJeremy Kerr } 1374dd37eed7SJeremy Kerr 1375356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 1376356d8009SChristopher Bostic { 1377356d8009SChristopher Bostic if (!fsi_drv) 1378356d8009SChristopher Bostic return -EINVAL; 1379356d8009SChristopher Bostic if (!fsi_drv->id_table) 1380356d8009SChristopher Bostic return -EINVAL; 1381356d8009SChristopher Bostic 1382356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 1383356d8009SChristopher Bostic } 1384356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 1385356d8009SChristopher Bostic 1386356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 1387356d8009SChristopher Bostic { 1388356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 1389356d8009SChristopher Bostic } 1390356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 1391356d8009SChristopher Bostic 13920508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 13930508ad1fSJeremy Kerr .name = "fsi", 1394dd37eed7SJeremy Kerr .match = fsi_bus_match, 13950508ad1fSJeremy Kerr }; 13960508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 13970508ad1fSJeremy Kerr 1398496f8931SJoel Stanley static int __init fsi_init(void) 13990508ad1fSJeremy Kerr { 14000ab5fe53SBenjamin Herrenschmidt int rc; 14010ab5fe53SBenjamin Herrenschmidt 14020ab5fe53SBenjamin Herrenschmidt rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi"); 14030ab5fe53SBenjamin Herrenschmidt if (rc) 14040ab5fe53SBenjamin Herrenschmidt return rc; 14050ab5fe53SBenjamin Herrenschmidt rc = bus_register(&fsi_bus_type); 14060ab5fe53SBenjamin Herrenschmidt if (rc) 14070ab5fe53SBenjamin Herrenschmidt goto fail_bus; 14082e32c2d6SJeremy Kerr 14092e32c2d6SJeremy Kerr rc = class_register(&fsi_master_class); 14102e32c2d6SJeremy Kerr if (rc) 14112e32c2d6SJeremy Kerr goto fail_class; 14122e32c2d6SJeremy Kerr 14130ab5fe53SBenjamin Herrenschmidt return 0; 14140ab5fe53SBenjamin Herrenschmidt 14152e32c2d6SJeremy Kerr fail_class: 14162e32c2d6SJeremy Kerr bus_unregister(&fsi_bus_type); 14170ab5fe53SBenjamin Herrenschmidt fail_bus: 14180ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 14190ab5fe53SBenjamin Herrenschmidt return rc; 14200508ad1fSJeremy Kerr } 1421496f8931SJoel Stanley postcore_initcall(fsi_init); 14220508ad1fSJeremy Kerr 14230508ad1fSJeremy Kerr static void fsi_exit(void) 14240508ad1fSJeremy Kerr { 14252e32c2d6SJeremy Kerr class_unregister(&fsi_master_class); 14260508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 14270ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 14280ab5fe53SBenjamin Herrenschmidt ida_destroy(&fsi_minor_ida); 14290508ad1fSJeremy Kerr } 14300508ad1fSJeremy Kerr module_exit(fsi_exit); 14311fa847d7SJeremy Kerr module_param(discard_errors, int, 0664); 1432acb7e8f7SChristopher Bostic MODULE_LICENSE("GPL"); 14331fa847d7SJeremy Kerr MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); 1434