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> 202b545cd8SJeremy Kerr #include <linux/slab.h> 21f7ade2a6SJeremy Kerr #include <linux/bitops.h> 22d1dcd678SBenjamin Herrenschmidt #include <linux/cdev.h> 23d1dcd678SBenjamin Herrenschmidt #include <linux/fs.h> 24d1dcd678SBenjamin Herrenschmidt #include <linux/uaccess.h> 250508ad1fSJeremy Kerr 2609aecfabSJeremy Kerr #include "fsi-master.h" 27d5d8dfb0SEddie James #include "fsi-slave.h" 28d5d8dfb0SEddie James 29d5d8dfb0SEddie James #define CREATE_TRACE_POINTS 30d5d8dfb0SEddie James #include <trace/events/fsi.h> 3109aecfabSJeremy Kerr 32f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) 33f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) 34f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 35f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) 36f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_SHIFT 12 37f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) 38f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_SHIFT 4 39f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_SHIFT 4 40f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) 41f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_DATA_BITS 28 42f7ade2a6SJeremy Kerr 434efe37f4SJeremy Kerr #define FSI_PEEK_BASE 0x410 444efe37f4SJeremy Kerr 45f7ade2a6SJeremy Kerr static const int engine_page_size = 0x400; 46f7ade2a6SJeremy Kerr 472b37c3e2SChristopher Bostic #define FSI_SLAVE_BASE 0x800 482b37c3e2SChristopher Bostic 492b37c3e2SChristopher Bostic /* 502b37c3e2SChristopher Bostic * FSI slave engine control register offsets 512b37c3e2SChristopher Bostic */ 522b37c3e2SChristopher Bostic #define FSI_SMODE 0x0 /* R/W: Mode register */ 531fa847d7SJeremy Kerr #define FSI_SISC 0x8 /* R/W: Interrupt condition */ 541fa847d7SJeremy Kerr #define FSI_SSTAT 0x14 /* R : Slave status */ 55196964a3SEddie James #define FSI_SLBUS 0x30 /* W : LBUS Ownership */ 564af889b0SJeremy Kerr #define FSI_LLMODE 0x100 /* R/W: Link layer mode register */ 572b37c3e2SChristopher Bostic 582b37c3e2SChristopher Bostic /* 592b37c3e2SChristopher Bostic * SMODE fields 602b37c3e2SChristopher Bostic */ 612b37c3e2SChristopher Bostic #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ 622b37c3e2SChristopher Bostic #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ 632b37c3e2SChristopher Bostic #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ 642b37c3e2SChristopher Bostic #define FSI_SMODE_SID_MASK 3 /* ID Mask */ 652b37c3e2SChristopher Bostic #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ 662b37c3e2SChristopher Bostic #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ 672b37c3e2SChristopher Bostic #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ 682b37c3e2SChristopher Bostic #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ 692b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ 702b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ 712b37c3e2SChristopher Bostic 724af889b0SJeremy Kerr /* 73196964a3SEddie James * SLBUS fields 74196964a3SEddie James */ 75196964a3SEddie James #define FSI_SLBUS_FORCE 0x80000000 /* Force LBUS ownership */ 76196964a3SEddie James 77196964a3SEddie James /* 784af889b0SJeremy Kerr * LLMODE fields 794af889b0SJeremy Kerr */ 804af889b0SJeremy Kerr #define FSI_LLMODE_ASYNC 0x1 814af889b0SJeremy Kerr 822b545cd8SJeremy Kerr #define FSI_SLAVE_SIZE_23b 0x800000 832b545cd8SJeremy Kerr 8409aecfabSJeremy Kerr static DEFINE_IDA(master_ida); 8509aecfabSJeremy Kerr 861fa847d7SJeremy Kerr static const int slave_retries = 2; 871fa847d7SJeremy Kerr static int discard_errors; 881fa847d7SJeremy Kerr 890ab5fe53SBenjamin Herrenschmidt static dev_t fsi_base_dev; 900ab5fe53SBenjamin Herrenschmidt static DEFINE_IDA(fsi_minor_ida); 910ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_MAX_DEVICES 0x1000 920ab5fe53SBenjamin Herrenschmidt 930ab5fe53SBenjamin Herrenschmidt /* Legacy /dev numbering: 4 devices per chip, 16 chips */ 940ab5fe53SBenjamin Herrenschmidt #define FSI_CHAR_LEGACY_TOP 64 950ab5fe53SBenjamin Herrenschmidt 96014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 97014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 98014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 99014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 1001fa847d7SJeremy Kerr static int fsi_master_break(struct fsi_master *master, int link); 101014c2abcSJeremy Kerr 1024efe37f4SJeremy Kerr /* 1034efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 1044efe37f4SJeremy Kerr * 1054efe37f4SJeremy Kerr * FSI endpoint-device support 1064efe37f4SJeremy Kerr * 1074efe37f4SJeremy Kerr * Read / write / peek accessors for a client 1084efe37f4SJeremy Kerr * 1094efe37f4SJeremy Kerr * Parameters: 1104efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 1114efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 1124efe37f4SJeremy Kerr * plus desired offset to access its register space. 1134efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 1144efe37f4SJeremy Kerr * write this is value to write to the specified address. 1154efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 1164efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1174efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1184efe37f4SJeremy Kerr */ 1194efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1204efe37f4SJeremy Kerr size_t size) 1214efe37f4SJeremy Kerr { 1224efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1234efe37f4SJeremy Kerr return -EINVAL; 1244efe37f4SJeremy Kerr 1254efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1264efe37f4SJeremy Kerr } 1274efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1284efe37f4SJeremy Kerr 1294efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1304efe37f4SJeremy Kerr size_t size) 1314efe37f4SJeremy Kerr { 1324efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1334efe37f4SJeremy Kerr return -EINVAL; 1344efe37f4SJeremy Kerr 1354efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1364efe37f4SJeremy Kerr } 1374efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1384efe37f4SJeremy Kerr 1394efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1404efe37f4SJeremy Kerr { 1414efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1424efe37f4SJeremy Kerr 1434efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1444efe37f4SJeremy Kerr } 145f7ade2a6SJeremy Kerr 146f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 147f7ade2a6SJeremy Kerr { 148f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 149f7ade2a6SJeremy Kerr 150f6a2f8ebSJeremy Kerr of_node_put(device->dev.of_node); 151f7ade2a6SJeremy Kerr kfree(device); 152f7ade2a6SJeremy Kerr } 153f7ade2a6SJeremy Kerr 154f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 155f7ade2a6SJeremy Kerr { 156f7ade2a6SJeremy Kerr struct fsi_device *dev; 157f7ade2a6SJeremy Kerr 158f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 159f7ade2a6SJeremy Kerr if (!dev) 160f7ade2a6SJeremy Kerr return NULL; 161f7ade2a6SJeremy Kerr 162f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 163f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 164f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 165f7ade2a6SJeremy Kerr 166f7ade2a6SJeremy Kerr return dev; 167f7ade2a6SJeremy Kerr } 168f7ade2a6SJeremy Kerr 169414c1026SJeremy Kerr /* FSI slave support */ 170014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 171014c2abcSJeremy Kerr uint8_t *idp) 172014c2abcSJeremy Kerr { 173014c2abcSJeremy Kerr uint32_t addr = *addrp; 174014c2abcSJeremy Kerr uint8_t id = *idp; 175014c2abcSJeremy Kerr 176014c2abcSJeremy Kerr if (addr > slave->size) 177014c2abcSJeremy Kerr return -EINVAL; 178014c2abcSJeremy Kerr 179014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 180014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 181014c2abcSJeremy Kerr */ 182014c2abcSJeremy Kerr if (addr > 0x1fffff) { 183014c2abcSJeremy Kerr if (slave->id != 0) 184014c2abcSJeremy Kerr return -EINVAL; 185014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 186014c2abcSJeremy Kerr addr &= 0x1fffff; 187014c2abcSJeremy Kerr } 188014c2abcSJeremy Kerr 189014c2abcSJeremy Kerr *addrp = addr; 190014c2abcSJeremy Kerr *idp = id; 191014c2abcSJeremy Kerr return 0; 192014c2abcSJeremy Kerr } 193014c2abcSJeremy Kerr 194ed50a089SColin Ian King static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) 1951fa847d7SJeremy Kerr { 1961fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 19711454d6dSJoel Stanley __be32 irq, stat; 1981fa847d7SJeremy Kerr int rc, link; 1991fa847d7SJeremy Kerr uint8_t id; 2001fa847d7SJeremy Kerr 2011fa847d7SJeremy Kerr link = slave->link; 2021fa847d7SJeremy Kerr id = slave->id; 2031fa847d7SJeremy Kerr 2041fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2051fa847d7SJeremy Kerr &irq, sizeof(irq)); 2061fa847d7SJeremy Kerr if (rc) 2071fa847d7SJeremy Kerr return rc; 2081fa847d7SJeremy Kerr 2091fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, 2101fa847d7SJeremy Kerr &stat, sizeof(stat)); 2111fa847d7SJeremy Kerr if (rc) 2121fa847d7SJeremy Kerr return rc; 2131fa847d7SJeremy Kerr 214638bd9acSChristopher Bostic dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", 2151fa847d7SJeremy Kerr be32_to_cpu(stat), be32_to_cpu(irq)); 2161fa847d7SJeremy Kerr 2171fa847d7SJeremy Kerr /* clear interrupts */ 2181fa847d7SJeremy Kerr return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2191fa847d7SJeremy Kerr &irq, sizeof(irq)); 2201fa847d7SJeremy Kerr } 2211fa847d7SJeremy Kerr 222935f9636SBenjamin Herrenschmidt /* Encode slave local bus echo delay */ 223935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_echodly(int x) 224935f9636SBenjamin Herrenschmidt { 225935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 226935f9636SBenjamin Herrenschmidt } 227935f9636SBenjamin Herrenschmidt 228935f9636SBenjamin Herrenschmidt /* Encode slave local bus send delay */ 229935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_senddly(int x) 230935f9636SBenjamin Herrenschmidt { 231935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 232935f9636SBenjamin Herrenschmidt } 233935f9636SBenjamin Herrenschmidt 234935f9636SBenjamin Herrenschmidt /* Encode slave local bus clock rate ratio */ 235935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_lbcrr(int x) 236935f9636SBenjamin Herrenschmidt { 237935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 238935f9636SBenjamin Herrenschmidt } 239935f9636SBenjamin Herrenschmidt 240935f9636SBenjamin Herrenschmidt /* Encode slave ID */ 241935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_sid(int x) 242935f9636SBenjamin Herrenschmidt { 243935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 244935f9636SBenjamin Herrenschmidt } 245935f9636SBenjamin Herrenschmidt 246a2e7da86SBenjamin Herrenschmidt static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly) 247935f9636SBenjamin Herrenschmidt { 248935f9636SBenjamin Herrenschmidt return FSI_SMODE_WSC | FSI_SMODE_ECRC 249935f9636SBenjamin Herrenschmidt | fsi_smode_sid(id) 250a2e7da86SBenjamin Herrenschmidt | fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1) 251935f9636SBenjamin Herrenschmidt | fsi_smode_lbcrr(0x8); 252935f9636SBenjamin Herrenschmidt } 253935f9636SBenjamin Herrenschmidt 254a2e7da86SBenjamin Herrenschmidt static int fsi_slave_set_smode(struct fsi_slave *slave) 255935f9636SBenjamin Herrenschmidt { 256935f9636SBenjamin Herrenschmidt uint32_t smode; 257935f9636SBenjamin Herrenschmidt __be32 data; 258935f9636SBenjamin Herrenschmidt 259935f9636SBenjamin Herrenschmidt /* set our smode register with the slave ID field to 0; this enables 260935f9636SBenjamin Herrenschmidt * extended slave addressing 261935f9636SBenjamin Herrenschmidt */ 262a2e7da86SBenjamin Herrenschmidt smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay); 263935f9636SBenjamin Herrenschmidt data = cpu_to_be32(smode); 264935f9636SBenjamin Herrenschmidt 265a2e7da86SBenjamin Herrenschmidt return fsi_master_write(slave->master, slave->link, slave->id, 266a2e7da86SBenjamin Herrenschmidt FSI_SLAVE_BASE + FSI_SMODE, 267935f9636SBenjamin Herrenschmidt &data, sizeof(data)); 268935f9636SBenjamin Herrenschmidt } 2691fa847d7SJeremy Kerr 270ed50a089SColin Ian King static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, 271ed50a089SColin Ian King uint32_t addr, size_t size) 2721fa847d7SJeremy Kerr { 2731fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 2741fa847d7SJeremy Kerr int rc, link; 2751fa847d7SJeremy Kerr uint32_t reg; 276a2e7da86SBenjamin Herrenschmidt uint8_t id, send_delay, echo_delay; 2771fa847d7SJeremy Kerr 2781fa847d7SJeremy Kerr if (discard_errors) 2791fa847d7SJeremy Kerr return -1; 2801fa847d7SJeremy Kerr 2811fa847d7SJeremy Kerr link = slave->link; 2821fa847d7SJeremy Kerr id = slave->id; 2831fa847d7SJeremy Kerr 2841fa847d7SJeremy Kerr dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", 2851fa847d7SJeremy Kerr write ? "write" : "read", addr, size); 2861fa847d7SJeremy Kerr 2871fa847d7SJeremy Kerr /* try a simple clear of error conditions, which may fail if we've lost 2881fa847d7SJeremy Kerr * communication with the slave 2891fa847d7SJeremy Kerr */ 2901fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 2911fa847d7SJeremy Kerr if (!rc) 2921fa847d7SJeremy Kerr return 0; 2931fa847d7SJeremy Kerr 2941fa847d7SJeremy Kerr /* send a TERM and retry */ 2951fa847d7SJeremy Kerr if (master->term) { 2961fa847d7SJeremy Kerr rc = master->term(master, link, id); 2971fa847d7SJeremy Kerr if (!rc) { 2981fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, 0, 2991fa847d7SJeremy Kerr ®, sizeof(reg)); 3001fa847d7SJeremy Kerr if (!rc) 3011fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 3021fa847d7SJeremy Kerr if (!rc) 3031fa847d7SJeremy Kerr return 0; 3041fa847d7SJeremy Kerr } 3051fa847d7SJeremy Kerr } 3061fa847d7SJeremy Kerr 307a2e7da86SBenjamin Herrenschmidt send_delay = slave->t_send_delay; 308a2e7da86SBenjamin Herrenschmidt echo_delay = slave->t_echo_delay; 309a2e7da86SBenjamin Herrenschmidt 3101fa847d7SJeremy Kerr /* getting serious, reset the slave via BREAK */ 3111fa847d7SJeremy Kerr rc = fsi_master_break(master, link); 3121fa847d7SJeremy Kerr if (rc) 3131fa847d7SJeremy Kerr return rc; 3141fa847d7SJeremy Kerr 315a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = send_delay; 316a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = echo_delay; 317a2e7da86SBenjamin Herrenschmidt 318a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 3191fa847d7SJeremy Kerr if (rc) 3201fa847d7SJeremy Kerr return rc; 3211fa847d7SJeremy Kerr 322a2e7da86SBenjamin Herrenschmidt if (master->link_config) 323a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 324a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 325a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 326a2e7da86SBenjamin Herrenschmidt 3271fa847d7SJeremy Kerr return fsi_slave_report_and_clear_errors(slave); 3281fa847d7SJeremy Kerr } 3291fa847d7SJeremy Kerr 330da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 331014c2abcSJeremy Kerr void *val, size_t size) 332014c2abcSJeremy Kerr { 333014c2abcSJeremy Kerr uint8_t id = slave->id; 3341fa847d7SJeremy Kerr int rc, err_rc, i; 335014c2abcSJeremy Kerr 336014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 337014c2abcSJeremy Kerr if (rc) 338014c2abcSJeremy Kerr return rc; 339014c2abcSJeremy Kerr 3401fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3411fa847d7SJeremy Kerr rc = fsi_master_read(slave->master, slave->link, 3421fa847d7SJeremy Kerr id, addr, val, size); 3431fa847d7SJeremy Kerr if (!rc) 3441fa847d7SJeremy Kerr break; 3451fa847d7SJeremy Kerr 3461fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, false, addr, size); 3471fa847d7SJeremy Kerr if (err_rc) 3481fa847d7SJeremy Kerr break; 3491fa847d7SJeremy Kerr } 3501fa847d7SJeremy Kerr 3511fa847d7SJeremy Kerr return rc; 352014c2abcSJeremy Kerr } 353da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 354014c2abcSJeremy Kerr 355da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 356014c2abcSJeremy Kerr const void *val, size_t size) 357014c2abcSJeremy Kerr { 358014c2abcSJeremy Kerr uint8_t id = slave->id; 3591fa847d7SJeremy Kerr int rc, err_rc, i; 360014c2abcSJeremy Kerr 361014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 362014c2abcSJeremy Kerr if (rc) 363014c2abcSJeremy Kerr return rc; 364014c2abcSJeremy Kerr 3651fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3661fa847d7SJeremy Kerr rc = fsi_master_write(slave->master, slave->link, 3671fa847d7SJeremy Kerr id, addr, val, size); 3681fa847d7SJeremy Kerr if (!rc) 3691fa847d7SJeremy Kerr break; 3701fa847d7SJeremy Kerr 3711fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, true, addr, size); 3721fa847d7SJeremy Kerr if (err_rc) 3731fa847d7SJeremy Kerr break; 3741fa847d7SJeremy Kerr } 3751fa847d7SJeremy Kerr 3761fa847d7SJeremy Kerr return rc; 377014c2abcSJeremy Kerr } 378da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 379da36cadfSJeremy Kerr 380362fbc83STom Rix int fsi_slave_claim_range(struct fsi_slave *slave, 381da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 382da36cadfSJeremy Kerr { 383da36cadfSJeremy Kerr if (addr + size < addr) 384da36cadfSJeremy Kerr return -EINVAL; 385da36cadfSJeremy Kerr 386da36cadfSJeremy Kerr if (addr + size > slave->size) 387da36cadfSJeremy Kerr return -EINVAL; 388da36cadfSJeremy Kerr 389da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 390da36cadfSJeremy Kerr return 0; 391da36cadfSJeremy Kerr } 392da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 393da36cadfSJeremy Kerr 394362fbc83STom Rix void fsi_slave_release_range(struct fsi_slave *slave, 395da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 396da36cadfSJeremy Kerr { 397da36cadfSJeremy Kerr } 398da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 399014c2abcSJeremy Kerr 400f6a2f8ebSJeremy Kerr static bool fsi_device_node_matches(struct device *dev, struct device_node *np, 401f6a2f8ebSJeremy Kerr uint32_t addr, uint32_t size) 402f6a2f8ebSJeremy Kerr { 40323ad7ec1SRob Herring u64 paddr, psize; 404f6a2f8ebSJeremy Kerr 40523ad7ec1SRob Herring if (of_property_read_reg(np, 0, &paddr, &psize)) 406f6a2f8ebSJeremy Kerr return false; 407f6a2f8ebSJeremy Kerr 40823ad7ec1SRob Herring if (paddr != addr) 409f6a2f8ebSJeremy Kerr return false; 410f6a2f8ebSJeremy Kerr 411f6a2f8ebSJeremy Kerr if (psize != size) { 412f6a2f8ebSJeremy Kerr dev_warn(dev, 41323ad7ec1SRob Herring "node %pOF matches probed address, but not size (got 0x%llx, expected 0x%x)", 41423ad7ec1SRob Herring np, psize, size); 415f6a2f8ebSJeremy Kerr } 416f6a2f8ebSJeremy Kerr 417f6a2f8ebSJeremy Kerr return true; 418f6a2f8ebSJeremy Kerr } 419f6a2f8ebSJeremy Kerr 420f6a2f8ebSJeremy Kerr /* Find a matching node for the slave engine at @address, using @size bytes 421f6a2f8ebSJeremy Kerr * of space. Returns NULL if not found, or a matching node with refcount 422f6a2f8ebSJeremy Kerr * already incremented. 423f6a2f8ebSJeremy Kerr */ 424f6a2f8ebSJeremy Kerr static struct device_node *fsi_device_find_of_node(struct fsi_device *dev) 425f6a2f8ebSJeremy Kerr { 426f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 427f6a2f8ebSJeremy Kerr 428f6a2f8ebSJeremy Kerr parent = dev_of_node(&dev->slave->dev); 429f6a2f8ebSJeremy Kerr if (!parent) 430f6a2f8ebSJeremy Kerr return NULL; 431f6a2f8ebSJeremy Kerr 432f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 433f6a2f8ebSJeremy Kerr if (fsi_device_node_matches(&dev->dev, np, 434f6a2f8ebSJeremy Kerr dev->addr, dev->size)) 435f6a2f8ebSJeremy Kerr return np; 436f6a2f8ebSJeremy Kerr } 437f6a2f8ebSJeremy Kerr 438f6a2f8ebSJeremy Kerr return NULL; 439f6a2f8ebSJeremy Kerr } 440f6a2f8ebSJeremy Kerr 441f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 442f7ade2a6SJeremy Kerr { 443f7ade2a6SJeremy Kerr uint32_t engine_addr; 444f7ade2a6SJeremy Kerr int rc, i; 445f7ade2a6SJeremy Kerr 446f7ade2a6SJeremy Kerr /* 447f7ade2a6SJeremy Kerr * scan engines 448f7ade2a6SJeremy Kerr * 449f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 450f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 451f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 452f7ade2a6SJeremy Kerr */ 453f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 454f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 455f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 456f7ade2a6SJeremy Kerr struct fsi_device *dev; 45711454d6dSJoel Stanley uint32_t conf; 45811454d6dSJoel Stanley __be32 data; 459f7ade2a6SJeremy Kerr 46011454d6dSJoel Stanley rc = fsi_slave_read(slave, (i + 1) * sizeof(data), 46111454d6dSJoel Stanley &data, sizeof(data)); 462f7ade2a6SJeremy Kerr if (rc) { 463f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 464f7ade2a6SJeremy Kerr "error reading slave registers\n"); 465f7ade2a6SJeremy Kerr return -1; 466f7ade2a6SJeremy Kerr } 46711454d6dSJoel Stanley conf = be32_to_cpu(data); 468f7ade2a6SJeremy Kerr 469f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 470f7ade2a6SJeremy Kerr if (crc) { 471f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 472f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 473f7ade2a6SJeremy Kerr i); 474f7ade2a6SJeremy Kerr return -1; 475f7ade2a6SJeremy Kerr } 476f7ade2a6SJeremy Kerr 477f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 478f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 479f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 480f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 481f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 482f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 483f7ade2a6SJeremy Kerr 484f7ade2a6SJeremy Kerr /* 485f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 486f7ade2a6SJeremy Kerr * skips the defined address areas 487f7ade2a6SJeremy Kerr */ 488f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 489f7ade2a6SJeremy Kerr 490f7ade2a6SJeremy Kerr /* create device */ 491f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 492f7ade2a6SJeremy Kerr if (!dev) 493f7ade2a6SJeremy Kerr return -ENOMEM; 494f7ade2a6SJeremy Kerr 495f7ade2a6SJeremy Kerr dev->slave = slave; 496f7ade2a6SJeremy Kerr dev->engine_type = type; 497f7ade2a6SJeremy Kerr dev->version = version; 498f7ade2a6SJeremy Kerr dev->unit = i; 499f7ade2a6SJeremy Kerr dev->addr = engine_addr; 500f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 501f7ade2a6SJeremy Kerr 502f2af60bbSEddie James trace_fsi_dev_init(dev); 503f2af60bbSEddie James 504f7ade2a6SJeremy Kerr dev_dbg(&slave->dev, 505f7ade2a6SJeremy Kerr "engine[%i]: type %x, version %x, addr %x size %x\n", 506f7ade2a6SJeremy Kerr dev->unit, dev->engine_type, version, 507f7ade2a6SJeremy Kerr dev->addr, dev->size); 508f7ade2a6SJeremy Kerr 509f7ade2a6SJeremy Kerr dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", 510f7ade2a6SJeremy Kerr slave->master->idx, slave->link, 511f7ade2a6SJeremy Kerr slave->id, i - 2); 512f6a2f8ebSJeremy Kerr dev->dev.of_node = fsi_device_find_of_node(dev); 513f7ade2a6SJeremy Kerr 514f7ade2a6SJeremy Kerr rc = device_register(&dev->dev); 515f7ade2a6SJeremy Kerr if (rc) { 516f7ade2a6SJeremy Kerr dev_warn(&slave->dev, "add failed: %d\n", rc); 517f7ade2a6SJeremy Kerr put_device(&dev->dev); 518f7ade2a6SJeremy Kerr } 519f7ade2a6SJeremy Kerr } 520f7ade2a6SJeremy Kerr 521f7ade2a6SJeremy Kerr engine_addr += slots * engine_page_size; 522f7ade2a6SJeremy Kerr 523f7ade2a6SJeremy Kerr if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) 524f7ade2a6SJeremy Kerr break; 525f7ade2a6SJeremy Kerr } 526f7ade2a6SJeremy Kerr 527f7ade2a6SJeremy Kerr return 0; 528f7ade2a6SJeremy Kerr } 529f7ade2a6SJeremy Kerr 5309f4c2b51SAndrew Jeffery static unsigned long aligned_access_size(size_t offset, size_t count) 5319f4c2b51SAndrew Jeffery { 5329f4c2b51SAndrew Jeffery unsigned long offset_unit, count_unit; 5339f4c2b51SAndrew Jeffery 5349f4c2b51SAndrew Jeffery /* Criteria: 5359f4c2b51SAndrew Jeffery * 5369f4c2b51SAndrew Jeffery * 1. Access size must be less than or equal to the maximum access 5379f4c2b51SAndrew Jeffery * width or the highest power-of-two factor of offset 5389f4c2b51SAndrew Jeffery * 2. Access size must be less than or equal to the amount specified by 5399f4c2b51SAndrew Jeffery * count 5409f4c2b51SAndrew Jeffery * 5419f4c2b51SAndrew Jeffery * The access width is optimal if we can calculate 1 to be strictly 5429f4c2b51SAndrew Jeffery * equal while still satisfying 2. 5439f4c2b51SAndrew Jeffery */ 5449f4c2b51SAndrew Jeffery 5459f4c2b51SAndrew Jeffery /* Find 1 by the bottom bit of offset (with a 4 byte access cap) */ 5469f4c2b51SAndrew Jeffery offset_unit = BIT(__builtin_ctzl(offset | 4)); 5479f4c2b51SAndrew Jeffery 5489f4c2b51SAndrew Jeffery /* Find 2 by the top bit of count */ 5499f4c2b51SAndrew Jeffery count_unit = BIT(8 * sizeof(unsigned long) - 1 - __builtin_clzl(count)); 5509f4c2b51SAndrew Jeffery 5519f4c2b51SAndrew Jeffery /* Constrain the maximum access width to the minimum of both criteria */ 5529f4c2b51SAndrew Jeffery return BIT(__builtin_ctzl(offset_unit | count_unit)); 5539f4c2b51SAndrew Jeffery } 5549f4c2b51SAndrew Jeffery 555125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 556125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 557125739cbSJeremy Kerr loff_t off, size_t count) 558125739cbSJeremy Kerr { 559125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 560125739cbSJeremy Kerr size_t total_len, read_len; 561125739cbSJeremy Kerr int rc; 562125739cbSJeremy Kerr 563125739cbSJeremy Kerr if (off < 0) 564125739cbSJeremy Kerr return -EINVAL; 565125739cbSJeremy Kerr 566125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 567125739cbSJeremy Kerr return -EINVAL; 568125739cbSJeremy Kerr 569125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += read_len) { 5709f4c2b51SAndrew Jeffery read_len = aligned_access_size(off, count - total_len); 571125739cbSJeremy Kerr 572125739cbSJeremy Kerr rc = fsi_slave_read(slave, off, buf + total_len, read_len); 573125739cbSJeremy Kerr if (rc) 574125739cbSJeremy Kerr return rc; 575125739cbSJeremy Kerr 576125739cbSJeremy Kerr off += read_len; 577125739cbSJeremy Kerr } 578125739cbSJeremy Kerr 579125739cbSJeremy Kerr return count; 580125739cbSJeremy Kerr } 581125739cbSJeremy Kerr 582125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_write(struct file *file, 583125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 584125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 585125739cbSJeremy Kerr { 586125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 587125739cbSJeremy Kerr size_t total_len, write_len; 588125739cbSJeremy Kerr int rc; 589125739cbSJeremy Kerr 590125739cbSJeremy Kerr if (off < 0) 591125739cbSJeremy Kerr return -EINVAL; 592125739cbSJeremy Kerr 593125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 594125739cbSJeremy Kerr return -EINVAL; 595125739cbSJeremy Kerr 596125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += write_len) { 5979f4c2b51SAndrew Jeffery write_len = aligned_access_size(off, count - total_len); 598125739cbSJeremy Kerr 599125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 600125739cbSJeremy Kerr if (rc) 601125739cbSJeremy Kerr return rc; 602125739cbSJeremy Kerr 603125739cbSJeremy Kerr off += write_len; 604125739cbSJeremy Kerr } 605125739cbSJeremy Kerr 606125739cbSJeremy Kerr return count; 607125739cbSJeremy Kerr } 608125739cbSJeremy Kerr 609061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_raw_attr = { 610125739cbSJeremy Kerr .attr = { 611125739cbSJeremy Kerr .name = "raw", 612125739cbSJeremy Kerr .mode = 0600, 613125739cbSJeremy Kerr }, 614125739cbSJeremy Kerr .size = 0, 615125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 616125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 617125739cbSJeremy Kerr }; 618125739cbSJeremy Kerr 6192b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 6202b545cd8SJeremy Kerr { 6212b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 6222b545cd8SJeremy Kerr 6230ab5fe53SBenjamin Herrenschmidt fsi_free_minor(slave->dev.devt); 624f6a2f8ebSJeremy Kerr of_node_put(dev->of_node); 6252b545cd8SJeremy Kerr kfree(slave); 6262b545cd8SJeremy Kerr } 6272b545cd8SJeremy Kerr 628f6a2f8ebSJeremy Kerr static bool fsi_slave_node_matches(struct device_node *np, 629f6a2f8ebSJeremy Kerr int link, uint8_t id) 630f6a2f8ebSJeremy Kerr { 63123ad7ec1SRob Herring u64 addr; 632f6a2f8ebSJeremy Kerr 63323ad7ec1SRob Herring if (of_property_read_reg(np, 0, &addr, NULL)) 634f6a2f8ebSJeremy Kerr return false; 635f6a2f8ebSJeremy Kerr 63623ad7ec1SRob Herring return addr == (((u64)link << 32) | id); 637f6a2f8ebSJeremy Kerr } 638f6a2f8ebSJeremy Kerr 639f6a2f8ebSJeremy Kerr /* Find a matching node for the slave at (link, id). Returns NULL if none 640f6a2f8ebSJeremy Kerr * found, or a matching node with refcount already incremented. 641f6a2f8ebSJeremy Kerr */ 642f6a2f8ebSJeremy Kerr static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, 643f6a2f8ebSJeremy Kerr int link, uint8_t id) 644f6a2f8ebSJeremy Kerr { 645f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 646f6a2f8ebSJeremy Kerr 647f6a2f8ebSJeremy Kerr parent = dev_of_node(&master->dev); 648f6a2f8ebSJeremy Kerr if (!parent) 649f6a2f8ebSJeremy Kerr return NULL; 650f6a2f8ebSJeremy Kerr 651f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 652f6a2f8ebSJeremy Kerr if (fsi_slave_node_matches(np, link, id)) 653f6a2f8ebSJeremy Kerr return np; 654f6a2f8ebSJeremy Kerr } 655f6a2f8ebSJeremy Kerr 656f6a2f8ebSJeremy Kerr return NULL; 657f6a2f8ebSJeremy Kerr } 658f6a2f8ebSJeremy Kerr 659d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count, 660d1dcd678SBenjamin Herrenschmidt loff_t *offset) 661d1dcd678SBenjamin Herrenschmidt { 662d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 663d1dcd678SBenjamin Herrenschmidt size_t total_len, read_len; 664d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 665d1dcd678SBenjamin Herrenschmidt ssize_t rc; 666d1dcd678SBenjamin Herrenschmidt 667d1dcd678SBenjamin Herrenschmidt if (off < 0) 668d1dcd678SBenjamin Herrenschmidt return -EINVAL; 669d1dcd678SBenjamin Herrenschmidt 670d1dcd678SBenjamin Herrenschmidt if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 671d1dcd678SBenjamin Herrenschmidt return -EINVAL; 672d1dcd678SBenjamin Herrenschmidt 673d1dcd678SBenjamin Herrenschmidt for (total_len = 0; total_len < count; total_len += read_len) { 674d1dcd678SBenjamin Herrenschmidt __be32 data; 675d1dcd678SBenjamin Herrenschmidt 676d1dcd678SBenjamin Herrenschmidt read_len = min_t(size_t, count, 4); 677d1dcd678SBenjamin Herrenschmidt read_len -= off & 0x3; 678d1dcd678SBenjamin Herrenschmidt 679d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_read(slave, off, &data, read_len); 680d1dcd678SBenjamin Herrenschmidt if (rc) 681d1dcd678SBenjamin Herrenschmidt goto fail; 682d1dcd678SBenjamin Herrenschmidt rc = copy_to_user(buf + total_len, &data, read_len); 683d1dcd678SBenjamin Herrenschmidt if (rc) { 684d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 685d1dcd678SBenjamin Herrenschmidt goto fail; 686d1dcd678SBenjamin Herrenschmidt } 687d1dcd678SBenjamin Herrenschmidt off += read_len; 688d1dcd678SBenjamin Herrenschmidt } 689d1dcd678SBenjamin Herrenschmidt rc = count; 690d1dcd678SBenjamin Herrenschmidt fail: 691d1dcd678SBenjamin Herrenschmidt *offset = off; 69291081094SColin Ian King return rc; 693d1dcd678SBenjamin Herrenschmidt } 694d1dcd678SBenjamin Herrenschmidt 695d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_write(struct file *filep, const char __user *buf, 696d1dcd678SBenjamin Herrenschmidt size_t count, loff_t *offset) 697d1dcd678SBenjamin Herrenschmidt { 698d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = filep->private_data; 699d1dcd678SBenjamin Herrenschmidt size_t total_len, write_len; 700d1dcd678SBenjamin Herrenschmidt loff_t off = *offset; 701d1dcd678SBenjamin Herrenschmidt ssize_t rc; 702d1dcd678SBenjamin Herrenschmidt 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 += write_len) { 711d1dcd678SBenjamin Herrenschmidt __be32 data; 712d1dcd678SBenjamin Herrenschmidt 713d1dcd678SBenjamin Herrenschmidt write_len = min_t(size_t, count, 4); 714d1dcd678SBenjamin Herrenschmidt write_len -= off & 0x3; 715d1dcd678SBenjamin Herrenschmidt 716d1dcd678SBenjamin Herrenschmidt rc = copy_from_user(&data, buf + total_len, write_len); 717d1dcd678SBenjamin Herrenschmidt if (rc) { 718d1dcd678SBenjamin Herrenschmidt rc = -EFAULT; 719d1dcd678SBenjamin Herrenschmidt goto fail; 720d1dcd678SBenjamin Herrenschmidt } 721d1dcd678SBenjamin Herrenschmidt rc = fsi_slave_write(slave, off, &data, write_len); 722d1dcd678SBenjamin Herrenschmidt if (rc) 723d1dcd678SBenjamin Herrenschmidt goto fail; 724d1dcd678SBenjamin Herrenschmidt off += write_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 loff_t cfam_llseek(struct file *file, loff_t offset, int whence) 733d1dcd678SBenjamin Herrenschmidt { 734d1dcd678SBenjamin Herrenschmidt switch (whence) { 735d1dcd678SBenjamin Herrenschmidt case SEEK_CUR: 736d1dcd678SBenjamin Herrenschmidt break; 737d1dcd678SBenjamin Herrenschmidt case SEEK_SET: 738d1dcd678SBenjamin Herrenschmidt file->f_pos = offset; 739d1dcd678SBenjamin Herrenschmidt break; 740d1dcd678SBenjamin Herrenschmidt default: 741d1dcd678SBenjamin Herrenschmidt return -EINVAL; 742d1dcd678SBenjamin Herrenschmidt } 743d1dcd678SBenjamin Herrenschmidt 744d1dcd678SBenjamin Herrenschmidt return offset; 745d1dcd678SBenjamin Herrenschmidt } 746d1dcd678SBenjamin Herrenschmidt 747d1dcd678SBenjamin Herrenschmidt static int cfam_open(struct inode *inode, struct file *file) 748d1dcd678SBenjamin Herrenschmidt { 749d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = container_of(inode->i_cdev, struct fsi_slave, cdev); 750d1dcd678SBenjamin Herrenschmidt 751d1dcd678SBenjamin Herrenschmidt file->private_data = slave; 752d1dcd678SBenjamin Herrenschmidt 753d1dcd678SBenjamin Herrenschmidt return 0; 754d1dcd678SBenjamin Herrenschmidt } 755d1dcd678SBenjamin Herrenschmidt 756d1dcd678SBenjamin Herrenschmidt static const struct file_operations cfam_fops = { 757d1dcd678SBenjamin Herrenschmidt .owner = THIS_MODULE, 758d1dcd678SBenjamin Herrenschmidt .open = cfam_open, 759d1dcd678SBenjamin Herrenschmidt .llseek = cfam_llseek, 760d1dcd678SBenjamin Herrenschmidt .read = cfam_read, 761d1dcd678SBenjamin Herrenschmidt .write = cfam_write, 762d1dcd678SBenjamin Herrenschmidt }; 763d1dcd678SBenjamin Herrenschmidt 764d1dcd678SBenjamin Herrenschmidt static ssize_t send_term_store(struct device *dev, 765d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 766d1dcd678SBenjamin Herrenschmidt const char *buf, size_t count) 767d1dcd678SBenjamin Herrenschmidt { 768d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 769d1dcd678SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 770d1dcd678SBenjamin Herrenschmidt 771d1dcd678SBenjamin Herrenschmidt if (!master->term) 772d1dcd678SBenjamin Herrenschmidt return -ENODEV; 773d1dcd678SBenjamin Herrenschmidt 774d1dcd678SBenjamin Herrenschmidt master->term(master, slave->link, slave->id); 775d1dcd678SBenjamin Herrenschmidt return count; 776d1dcd678SBenjamin Herrenschmidt } 777d1dcd678SBenjamin Herrenschmidt 778d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_WO(send_term); 779d1dcd678SBenjamin Herrenschmidt 780a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_show(struct device *dev, 781a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, 782a2e7da86SBenjamin Herrenschmidt char *buf) 783a2e7da86SBenjamin Herrenschmidt { 784a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 785a2e7da86SBenjamin Herrenschmidt 786a2e7da86SBenjamin Herrenschmidt return sprintf(buf, "%u\n", slave->t_send_delay); 787a2e7da86SBenjamin Herrenschmidt } 788a2e7da86SBenjamin Herrenschmidt 789a2e7da86SBenjamin Herrenschmidt static ssize_t slave_send_echo_store(struct device *dev, 790a2e7da86SBenjamin Herrenschmidt struct device_attribute *attr, const char *buf, size_t count) 791a2e7da86SBenjamin Herrenschmidt { 792a2e7da86SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 793a2e7da86SBenjamin Herrenschmidt struct fsi_master *master = slave->master; 794a2e7da86SBenjamin Herrenschmidt unsigned long val; 795a2e7da86SBenjamin Herrenschmidt int rc; 796a2e7da86SBenjamin Herrenschmidt 797a2e7da86SBenjamin Herrenschmidt if (kstrtoul(buf, 0, &val) < 0) 798a2e7da86SBenjamin Herrenschmidt return -EINVAL; 799a2e7da86SBenjamin Herrenschmidt 800a2e7da86SBenjamin Herrenschmidt if (val < 1 || val > 16) 801a2e7da86SBenjamin Herrenschmidt return -EINVAL; 802a2e7da86SBenjamin Herrenschmidt 803a2e7da86SBenjamin Herrenschmidt if (!master->link_config) 804a2e7da86SBenjamin Herrenschmidt return -ENXIO; 805a2e7da86SBenjamin Herrenschmidt 806a2e7da86SBenjamin Herrenschmidt /* Current HW mandates that send and echo delay are identical */ 807a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = val; 808a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = val; 809a2e7da86SBenjamin Herrenschmidt 810a2e7da86SBenjamin Herrenschmidt rc = fsi_slave_set_smode(slave); 811a2e7da86SBenjamin Herrenschmidt if (rc < 0) 812a2e7da86SBenjamin Herrenschmidt return rc; 813a2e7da86SBenjamin Herrenschmidt if (master->link_config) 814a2e7da86SBenjamin Herrenschmidt master->link_config(master, slave->link, 815a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 816a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 817a2e7da86SBenjamin Herrenschmidt 818a2e7da86SBenjamin Herrenschmidt return count; 819a2e7da86SBenjamin Herrenschmidt } 820a2e7da86SBenjamin Herrenschmidt 821a2e7da86SBenjamin Herrenschmidt static DEVICE_ATTR(send_echo_delays, 0600, 822a2e7da86SBenjamin Herrenschmidt slave_send_echo_show, slave_send_echo_store); 823a2e7da86SBenjamin Herrenschmidt 8240a213777SBenjamin Herrenschmidt static ssize_t chip_id_show(struct device *dev, 8250a213777SBenjamin Herrenschmidt struct device_attribute *attr, 8260a213777SBenjamin Herrenschmidt char *buf) 8270a213777SBenjamin Herrenschmidt { 8280a213777SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 8290a213777SBenjamin Herrenschmidt 8300a213777SBenjamin Herrenschmidt return sprintf(buf, "%d\n", slave->chip_id); 8310a213777SBenjamin Herrenschmidt } 8320a213777SBenjamin Herrenschmidt 8330a213777SBenjamin Herrenschmidt static DEVICE_ATTR_RO(chip_id); 8340a213777SBenjamin Herrenschmidt 835d1dcd678SBenjamin Herrenschmidt static ssize_t cfam_id_show(struct device *dev, 836d1dcd678SBenjamin Herrenschmidt struct device_attribute *attr, 837d1dcd678SBenjamin Herrenschmidt char *buf) 838d1dcd678SBenjamin Herrenschmidt { 839d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 840d1dcd678SBenjamin Herrenschmidt 841d1dcd678SBenjamin Herrenschmidt return sprintf(buf, "0x%x\n", slave->cfam_id); 842d1dcd678SBenjamin Herrenschmidt } 843d1dcd678SBenjamin Herrenschmidt 844d1dcd678SBenjamin Herrenschmidt static DEVICE_ATTR_RO(cfam_id); 845d1dcd678SBenjamin Herrenschmidt 846d1dcd678SBenjamin Herrenschmidt static struct attribute *cfam_attr[] = { 847d1dcd678SBenjamin Herrenschmidt &dev_attr_send_echo_delays.attr, 848d1dcd678SBenjamin Herrenschmidt &dev_attr_chip_id.attr, 849d1dcd678SBenjamin Herrenschmidt &dev_attr_cfam_id.attr, 850d1dcd678SBenjamin Herrenschmidt &dev_attr_send_term.attr, 851d1dcd678SBenjamin Herrenschmidt NULL, 852d1dcd678SBenjamin Herrenschmidt }; 853d1dcd678SBenjamin Herrenschmidt 854d1dcd678SBenjamin Herrenschmidt static const struct attribute_group cfam_attr_group = { 855d1dcd678SBenjamin Herrenschmidt .attrs = cfam_attr, 856d1dcd678SBenjamin Herrenschmidt }; 857d1dcd678SBenjamin Herrenschmidt 858d1dcd678SBenjamin Herrenschmidt static const struct attribute_group *cfam_attr_groups[] = { 859d1dcd678SBenjamin Herrenschmidt &cfam_attr_group, 860d1dcd678SBenjamin Herrenschmidt NULL, 861d1dcd678SBenjamin Herrenschmidt }; 862d1dcd678SBenjamin Herrenschmidt 863a9b12f8bSGreg Kroah-Hartman static char *cfam_devnode(const struct device *dev, umode_t *mode, 864d1dcd678SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 865d1dcd678SBenjamin Herrenschmidt { 866a9b12f8bSGreg Kroah-Hartman const struct fsi_slave *slave = to_fsi_slave(dev); 867d1dcd678SBenjamin Herrenschmidt 868d1dcd678SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 869d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx); 870d1dcd678SBenjamin Herrenschmidt #else 871d1dcd678SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "cfam%d", slave->cdev_idx); 872d1dcd678SBenjamin Herrenschmidt #endif 873d1dcd678SBenjamin Herrenschmidt } 874d1dcd678SBenjamin Herrenschmidt 875d1dcd678SBenjamin Herrenschmidt static const struct device_type cfam_type = { 876d1dcd678SBenjamin Herrenschmidt .name = "cfam", 877d1dcd678SBenjamin Herrenschmidt .devnode = cfam_devnode, 878d1dcd678SBenjamin Herrenschmidt .groups = cfam_attr_groups 879d1dcd678SBenjamin Herrenschmidt }; 880d1dcd678SBenjamin Herrenschmidt 881a9b12f8bSGreg Kroah-Hartman static char *fsi_cdev_devnode(const struct device *dev, umode_t *mode, 8820ab5fe53SBenjamin Herrenschmidt kuid_t *uid, kgid_t *gid) 8830ab5fe53SBenjamin Herrenschmidt { 8840ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 8850ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "fsi/%s", dev_name(dev)); 8860ab5fe53SBenjamin Herrenschmidt #else 8870ab5fe53SBenjamin Herrenschmidt return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 8880ab5fe53SBenjamin Herrenschmidt #endif 8890ab5fe53SBenjamin Herrenschmidt } 8900ab5fe53SBenjamin Herrenschmidt 8910ab5fe53SBenjamin Herrenschmidt const struct device_type fsi_cdev_type = { 8920ab5fe53SBenjamin Herrenschmidt .name = "fsi-cdev", 8930ab5fe53SBenjamin Herrenschmidt .devnode = fsi_cdev_devnode, 8940ab5fe53SBenjamin Herrenschmidt }; 8950ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_cdev_type); 8960ab5fe53SBenjamin Herrenschmidt 8970ab5fe53SBenjamin Herrenschmidt /* Backward compatible /dev/ numbering in "old style" mode */ 8980ab5fe53SBenjamin Herrenschmidt static int fsi_adjust_index(int index) 8990ab5fe53SBenjamin Herrenschmidt { 9000ab5fe53SBenjamin Herrenschmidt #ifdef CONFIG_FSI_NEW_DEV_NODE 9010ab5fe53SBenjamin Herrenschmidt return index; 9020ab5fe53SBenjamin Herrenschmidt #else 9030ab5fe53SBenjamin Herrenschmidt return index + 1; 9040ab5fe53SBenjamin Herrenschmidt #endif 9050ab5fe53SBenjamin Herrenschmidt } 9060ab5fe53SBenjamin Herrenschmidt 9070ab5fe53SBenjamin Herrenschmidt static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type, 9080ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9090ab5fe53SBenjamin Herrenschmidt { 9100ab5fe53SBenjamin Herrenschmidt int cid = slave->chip_id; 9110ab5fe53SBenjamin Herrenschmidt int id; 9120ab5fe53SBenjamin Herrenschmidt 9130ab5fe53SBenjamin Herrenschmidt /* Check if we qualify for legacy numbering */ 9140ab5fe53SBenjamin Herrenschmidt if (cid >= 0 && cid < 16 && type < 4) { 9150ab5fe53SBenjamin Herrenschmidt /* Try reserving the legacy number */ 9160ab5fe53SBenjamin Herrenschmidt id = (cid << 4) | type; 9170ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); 9180ab5fe53SBenjamin Herrenschmidt if (id >= 0) { 9190ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(cid); 9200ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9210ab5fe53SBenjamin Herrenschmidt return 0; 9220ab5fe53SBenjamin Herrenschmidt } 9230ab5fe53SBenjamin Herrenschmidt /* Other failure */ 9240ab5fe53SBenjamin Herrenschmidt if (id != -ENOSPC) 9250ab5fe53SBenjamin Herrenschmidt return id; 9260ab5fe53SBenjamin Herrenschmidt /* Fallback to non-legacy allocation */ 9270ab5fe53SBenjamin Herrenschmidt } 9280ab5fe53SBenjamin Herrenschmidt id = ida_simple_get(&fsi_minor_ida, FSI_CHAR_LEGACY_TOP, 9290ab5fe53SBenjamin Herrenschmidt FSI_CHAR_MAX_DEVICES, GFP_KERNEL); 9300ab5fe53SBenjamin Herrenschmidt if (id < 0) 9310ab5fe53SBenjamin Herrenschmidt return id; 9320ab5fe53SBenjamin Herrenschmidt *out_index = fsi_adjust_index(id); 9330ab5fe53SBenjamin Herrenschmidt *out_dev = fsi_base_dev + id; 9340ab5fe53SBenjamin Herrenschmidt return 0; 9350ab5fe53SBenjamin Herrenschmidt } 9360ab5fe53SBenjamin Herrenschmidt 937*21930d80SEddie James static const char *const fsi_dev_type_names[] = { 938*21930d80SEddie James "cfam", 939*21930d80SEddie James "sbefifo", 940*21930d80SEddie James "scom", 941*21930d80SEddie James "occ", 942*21930d80SEddie James }; 943*21930d80SEddie James 9440ab5fe53SBenjamin Herrenschmidt int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type, 9450ab5fe53SBenjamin Herrenschmidt dev_t *out_dev, int *out_index) 9460ab5fe53SBenjamin Herrenschmidt { 947*21930d80SEddie James if (fdev->dev.of_node) { 948*21930d80SEddie James int aid = of_alias_get_id(fdev->dev.of_node, fsi_dev_type_names[type]); 949*21930d80SEddie James 950*21930d80SEddie James if (aid >= 0) { 951*21930d80SEddie James int id = (aid << 4) | type; 952*21930d80SEddie James 953*21930d80SEddie James id = ida_simple_get(&fsi_minor_ida, id, id + 1, GFP_KERNEL); 954*21930d80SEddie James if (id >= 0) { 955*21930d80SEddie James *out_index = aid; 956*21930d80SEddie James *out_dev = fsi_base_dev + id; 957*21930d80SEddie James return 0; 958*21930d80SEddie James } 959*21930d80SEddie James 960*21930d80SEddie James if (id != -ENOSPC) 961*21930d80SEddie James return id; 962*21930d80SEddie James } 963*21930d80SEddie James } 964*21930d80SEddie James 9650ab5fe53SBenjamin Herrenschmidt return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index); 9660ab5fe53SBenjamin Herrenschmidt } 9670ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_get_new_minor); 9680ab5fe53SBenjamin Herrenschmidt 9690ab5fe53SBenjamin Herrenschmidt void fsi_free_minor(dev_t dev) 9700ab5fe53SBenjamin Herrenschmidt { 9710ab5fe53SBenjamin Herrenschmidt ida_simple_remove(&fsi_minor_ida, MINOR(dev)); 9720ab5fe53SBenjamin Herrenschmidt } 9730ab5fe53SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(fsi_free_minor); 9740ab5fe53SBenjamin Herrenschmidt 975414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 976414c1026SJeremy Kerr { 977d1dcd678SBenjamin Herrenschmidt uint32_t cfam_id; 9782b545cd8SJeremy Kerr struct fsi_slave *slave; 9792b545cd8SJeremy Kerr uint8_t crc; 980196964a3SEddie James __be32 data, llmode, slbus; 9812b545cd8SJeremy Kerr int rc; 982414c1026SJeremy Kerr 9832b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 9842b545cd8SJeremy Kerr * full 23-bit address range 9852b545cd8SJeremy Kerr */ 9862b545cd8SJeremy Kerr if (id != 0) 9872b545cd8SJeremy Kerr return -EINVAL; 9882b545cd8SJeremy Kerr 98911454d6dSJoel Stanley rc = fsi_master_read(master, link, id, 0, &data, sizeof(data)); 9902b545cd8SJeremy Kerr if (rc) { 9912b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 9922b545cd8SJeremy Kerr link, id, rc); 993414c1026SJeremy Kerr return -ENODEV; 994414c1026SJeremy Kerr } 995d1dcd678SBenjamin Herrenschmidt cfam_id = be32_to_cpu(data); 9962b545cd8SJeremy Kerr 997d1dcd678SBenjamin Herrenschmidt crc = crc4(0, cfam_id, 32); 9982b545cd8SJeremy Kerr if (crc) { 999f2af60bbSEddie James trace_fsi_slave_invalid_cfam(master, link, cfam_id); 1000d1dcd678SBenjamin Herrenschmidt dev_warn(&master->dev, "slave %02x:%02x invalid cfam id CRC!\n", 10012b545cd8SJeremy Kerr link, id); 10022b545cd8SJeremy Kerr return -EIO; 10032b545cd8SJeremy Kerr } 10042b545cd8SJeremy Kerr 1005638bd9acSChristopher Bostic dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 1006d1dcd678SBenjamin Herrenschmidt cfam_id, master->idx, link, id); 10072b545cd8SJeremy Kerr 10084af889b0SJeremy Kerr /* If we're behind a master that doesn't provide a self-running bus 10094af889b0SJeremy Kerr * clock, put the slave into async mode 10104af889b0SJeremy Kerr */ 10114af889b0SJeremy Kerr if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { 10124af889b0SJeremy Kerr llmode = cpu_to_be32(FSI_LLMODE_ASYNC); 10134af889b0SJeremy Kerr rc = fsi_master_write(master, link, id, 10144af889b0SJeremy Kerr FSI_SLAVE_BASE + FSI_LLMODE, 10154af889b0SJeremy Kerr &llmode, sizeof(llmode)); 10164af889b0SJeremy Kerr if (rc) 10174af889b0SJeremy Kerr dev_warn(&master->dev, 10184af889b0SJeremy Kerr "can't set llmode on slave:%02x:%02x %d\n", 10194af889b0SJeremy Kerr link, id, rc); 10204af889b0SJeremy Kerr } 10214af889b0SJeremy Kerr 10222b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 10232b545cd8SJeremy Kerr * register. 10242b545cd8SJeremy Kerr */ 10252b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 10262b545cd8SJeremy Kerr if (!slave) 10272b545cd8SJeremy Kerr return -ENOMEM; 10282b545cd8SJeremy Kerr 1029d1dcd678SBenjamin Herrenschmidt dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 1030d1dcd678SBenjamin Herrenschmidt slave->dev.type = &cfam_type; 10312b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 1032f6a2f8ebSJeremy Kerr slave->dev.of_node = fsi_slave_find_of_node(master, link, id); 10332b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 1034d1dcd678SBenjamin Herrenschmidt device_initialize(&slave->dev); 1035d1dcd678SBenjamin Herrenschmidt slave->cfam_id = cfam_id; 1036d1dcd678SBenjamin Herrenschmidt slave->master = master; 10372b545cd8SJeremy Kerr slave->link = link; 10382b545cd8SJeremy Kerr slave->id = id; 10392b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 1040a2e7da86SBenjamin Herrenschmidt slave->t_send_delay = 16; 1041a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay = 16; 1042a2e7da86SBenjamin Herrenschmidt 10430a213777SBenjamin Herrenschmidt /* Get chip ID if any */ 10440a213777SBenjamin Herrenschmidt slave->chip_id = -1; 10450a213777SBenjamin Herrenschmidt if (slave->dev.of_node) { 10460a213777SBenjamin Herrenschmidt uint32_t prop; 10470a213777SBenjamin Herrenschmidt if (!of_property_read_u32(slave->dev.of_node, "chip-id", &prop)) 10480a213777SBenjamin Herrenschmidt slave->chip_id = prop; 10490a213777SBenjamin Herrenschmidt 10500a213777SBenjamin Herrenschmidt } 1051d1dcd678SBenjamin Herrenschmidt 1052196964a3SEddie James slbus = cpu_to_be32(FSI_SLBUS_FORCE); 1053196964a3SEddie James rc = fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SLBUS, 1054196964a3SEddie James &slbus, sizeof(slbus)); 1055196964a3SEddie James if (rc) 1056196964a3SEddie James dev_warn(&master->dev, 1057196964a3SEddie James "can't set slbus on slave:%02x:%02x %d\n", link, id, 1058196964a3SEddie James rc); 1059196964a3SEddie James 1060371975b0SJeremy Kerr rc = fsi_slave_set_smode(slave); 1061371975b0SJeremy Kerr if (rc) { 1062371975b0SJeremy Kerr dev_warn(&master->dev, 1063371975b0SJeremy Kerr "can't set smode on slave:%02x:%02x %d\n", 1064371975b0SJeremy Kerr link, id, rc); 1065371975b0SJeremy Kerr goto err_free; 1066371975b0SJeremy Kerr } 1067371975b0SJeremy Kerr 1068d1dcd678SBenjamin Herrenschmidt /* Allocate a minor in the FSI space */ 1069d1dcd678SBenjamin Herrenschmidt rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt, 1070d1dcd678SBenjamin Herrenschmidt &slave->cdev_idx); 1071d1dcd678SBenjamin Herrenschmidt if (rc) 1072d1dcd678SBenjamin Herrenschmidt goto err_free; 1073d1dcd678SBenjamin Herrenschmidt 1074f2af60bbSEddie James trace_fsi_slave_init(slave); 1075f2af60bbSEddie James 1076d1dcd678SBenjamin Herrenschmidt /* Create chardev for userspace access */ 1077d1dcd678SBenjamin Herrenschmidt cdev_init(&slave->cdev, &cfam_fops); 1078d1dcd678SBenjamin Herrenschmidt rc = cdev_device_add(&slave->cdev, &slave->dev); 1079d1dcd678SBenjamin Herrenschmidt if (rc) { 1080d1dcd678SBenjamin Herrenschmidt dev_err(&slave->dev, "Error %d creating slave device\n", rc); 1081371975b0SJeremy Kerr goto err_free_ida; 1082d1dcd678SBenjamin Herrenschmidt } 1083d1dcd678SBenjamin Herrenschmidt 1084371975b0SJeremy Kerr /* Now that we have the cdev registered with the core, any fatal 1085371975b0SJeremy Kerr * failures beyond this point will need to clean up through 1086371975b0SJeremy Kerr * cdev_device_del(). Fortunately though, nothing past here is fatal. 1087371975b0SJeremy Kerr */ 1088371975b0SJeremy Kerr 1089a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1090a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 1091a2e7da86SBenjamin Herrenschmidt slave->t_send_delay, 1092a2e7da86SBenjamin Herrenschmidt slave->t_echo_delay); 10932b545cd8SJeremy Kerr 1094d1dcd678SBenjamin Herrenschmidt /* Legacy raw file -> to be removed */ 1095125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 1096125739cbSJeremy Kerr if (rc) 1097125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 1098125739cbSJeremy Kerr 10990a213777SBenjamin Herrenschmidt 1100f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 1101f7ade2a6SJeremy Kerr if (rc) 1102f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 1103f7ade2a6SJeremy Kerr rc); 11042b545cd8SJeremy Kerr 1105371975b0SJeremy Kerr return 0; 1106d1dcd678SBenjamin Herrenschmidt 1107371975b0SJeremy Kerr err_free_ida: 1108371975b0SJeremy Kerr fsi_free_minor(slave->dev.devt); 1109d1dcd678SBenjamin Herrenschmidt err_free: 1110371975b0SJeremy Kerr of_node_put(slave->dev.of_node); 1111371975b0SJeremy Kerr kfree(slave); 1112d1dcd678SBenjamin Herrenschmidt return rc; 11132b545cd8SJeremy Kerr } 1114414c1026SJeremy Kerr 111509aecfabSJeremy Kerr /* FSI master support */ 1116014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 1117014c2abcSJeremy Kerr { 111899f039e9SEddie James if (size == 4) { 111999f039e9SEddie James if (addr & 0x3) 1120014c2abcSJeremy Kerr return -EINVAL; 112199f039e9SEddie James } else if (size == 2) { 112299f039e9SEddie James if (addr & 0x1) 112399f039e9SEddie James return -EINVAL; 112499f039e9SEddie James } else if (size != 1) 1125014c2abcSJeremy Kerr return -EINVAL; 1126014c2abcSJeremy Kerr 1127014c2abcSJeremy Kerr return 0; 1128014c2abcSJeremy Kerr } 1129014c2abcSJeremy Kerr 1130014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 1131014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 1132014c2abcSJeremy Kerr { 1133014c2abcSJeremy Kerr int rc; 1134014c2abcSJeremy Kerr 113566433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 1136014c2abcSJeremy Kerr 113766433b05SJeremy Kerr rc = fsi_check_access(addr, size); 113866433b05SJeremy Kerr if (!rc) 113966433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 114066433b05SJeremy Kerr 114166433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 114266433b05SJeremy Kerr false, val, rc); 114366433b05SJeremy Kerr 114466433b05SJeremy Kerr return rc; 1145014c2abcSJeremy Kerr } 1146014c2abcSJeremy Kerr 1147014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 1148014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 1149014c2abcSJeremy Kerr { 1150014c2abcSJeremy Kerr int rc; 1151014c2abcSJeremy Kerr 115266433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 1153014c2abcSJeremy Kerr 115466433b05SJeremy Kerr rc = fsi_check_access(addr, size); 115566433b05SJeremy Kerr if (!rc) 115666433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 115766433b05SJeremy Kerr 115866433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 115966433b05SJeremy Kerr true, val, rc); 116066433b05SJeremy Kerr 116166433b05SJeremy Kerr return rc; 1162014c2abcSJeremy Kerr } 1163014c2abcSJeremy Kerr 1164b36875a4SEddie James static int fsi_master_link_disable(struct fsi_master *master, int link) 1165b36875a4SEddie James { 1166b36875a4SEddie James if (master->link_enable) 1167b36875a4SEddie James return master->link_enable(master, link, false); 1168b36875a4SEddie James 1169b36875a4SEddie James return 0; 1170b36875a4SEddie James } 1171b36875a4SEddie James 117226095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 117326095282SChristopher Bostic { 117426095282SChristopher Bostic if (master->link_enable) 117504635a30SEddie James return master->link_enable(master, link, true); 117626095282SChristopher Bostic 117726095282SChristopher Bostic return 0; 117826095282SChristopher Bostic } 117926095282SChristopher Bostic 118026095282SChristopher Bostic /* 118126095282SChristopher Bostic * Issue a break command on this link 118226095282SChristopher Bostic */ 118326095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 118426095282SChristopher Bostic { 1185a2e7da86SBenjamin Herrenschmidt int rc = 0; 1186a2e7da86SBenjamin Herrenschmidt 118766433b05SJeremy Kerr trace_fsi_master_break(master, link); 118866433b05SJeremy Kerr 118926095282SChristopher Bostic if (master->send_break) 1190a2e7da86SBenjamin Herrenschmidt rc = master->send_break(master, link); 1191a2e7da86SBenjamin Herrenschmidt if (master->link_config) 1192a2e7da86SBenjamin Herrenschmidt master->link_config(master, link, 16, 16); 119326095282SChristopher Bostic 1194a2e7da86SBenjamin Herrenschmidt return rc; 119526095282SChristopher Bostic } 119626095282SChristopher Bostic 1197414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 1198414c1026SJeremy Kerr { 119926095282SChristopher Bostic int link, rc; 1200414c1026SJeremy Kerr 120126095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 120226095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 120326095282SChristopher Bostic if (rc) { 120426095282SChristopher Bostic dev_dbg(&master->dev, 120526095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 120626095282SChristopher Bostic continue; 120726095282SChristopher Bostic } 120826095282SChristopher Bostic rc = fsi_master_break(master, link); 120926095282SChristopher Bostic if (rc) { 1210b36875a4SEddie James fsi_master_link_disable(master, link); 121126095282SChristopher Bostic dev_dbg(&master->dev, 121226095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 121326095282SChristopher Bostic continue; 121426095282SChristopher Bostic } 121526095282SChristopher Bostic 1216b36875a4SEddie James rc = fsi_slave_init(master, link, 0); 1217b36875a4SEddie James if (rc) 1218b36875a4SEddie James fsi_master_link_disable(master, link); 121926095282SChristopher Bostic } 1220414c1026SJeremy Kerr 1221414c1026SJeremy Kerr return 0; 1222414c1026SJeremy Kerr } 1223414c1026SJeremy Kerr 1224cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 1225cd0fdb5cSChristopher Bostic { 1226cd0fdb5cSChristopher Bostic device_unregister(dev); 1227cd0fdb5cSChristopher Bostic return 0; 1228cd0fdb5cSChristopher Bostic } 1229cd0fdb5cSChristopher Bostic 1230cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 1231cd0fdb5cSChristopher Bostic { 1232d1dcd678SBenjamin Herrenschmidt struct fsi_slave *slave = to_fsi_slave(dev); 1233d1dcd678SBenjamin Herrenschmidt 1234cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 1235d1dcd678SBenjamin Herrenschmidt cdev_device_del(&slave->cdev, &slave->dev); 12360ab5fe53SBenjamin Herrenschmidt put_device(dev); 1237cd0fdb5cSChristopher Bostic return 0; 1238cd0fdb5cSChristopher Bostic } 1239cd0fdb5cSChristopher Bostic 1240cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 1241cd0fdb5cSChristopher Bostic { 1242cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 1243cd0fdb5cSChristopher Bostic } 1244cd0fdb5cSChristopher Bostic 124515362d69SJeremy Kerr int fsi_master_rescan(struct fsi_master *master) 124615362d69SJeremy Kerr { 12479840fcd8SBenjamin Herrenschmidt int rc; 12489840fcd8SBenjamin Herrenschmidt 12499840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 125015362d69SJeremy Kerr fsi_master_unscan(master); 12519840fcd8SBenjamin Herrenschmidt rc = fsi_master_scan(master); 12529840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 12539840fcd8SBenjamin Herrenschmidt 12549840fcd8SBenjamin Herrenschmidt return rc; 125515362d69SJeremy Kerr } 125615362d69SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_rescan); 125715362d69SJeremy Kerr 1258cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 1259cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 1260cd0fdb5cSChristopher Bostic { 1261cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 1262cd0fdb5cSChristopher Bostic int rc; 1263cd0fdb5cSChristopher Bostic 126415362d69SJeremy Kerr rc = fsi_master_rescan(master); 1265cd0fdb5cSChristopher Bostic if (rc < 0) 1266cd0fdb5cSChristopher Bostic return rc; 1267cd0fdb5cSChristopher Bostic 1268cd0fdb5cSChristopher Bostic return count; 1269cd0fdb5cSChristopher Bostic } 1270cd0fdb5cSChristopher Bostic 1271cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 1272cd0fdb5cSChristopher Bostic 1273125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 1274125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 1275125739cbSJeremy Kerr { 1276125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 1277125739cbSJeremy Kerr 1278125739cbSJeremy Kerr fsi_master_break(master, 0); 1279125739cbSJeremy Kerr 1280125739cbSJeremy Kerr return count; 1281125739cbSJeremy Kerr } 1282125739cbSJeremy Kerr 1283125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 1284125739cbSJeremy Kerr 1285cf700ba0SJeremy Kerr static struct attribute *master_attrs[] = { 1286cf700ba0SJeremy Kerr &dev_attr_break.attr, 1287cf700ba0SJeremy Kerr &dev_attr_rescan.attr, 1288cf700ba0SJeremy Kerr NULL 1289cf700ba0SJeremy Kerr }; 1290cf700ba0SJeremy Kerr 1291cf700ba0SJeremy Kerr ATTRIBUTE_GROUPS(master); 1292cf700ba0SJeremy Kerr 129356ec311fSkbuild test robot static struct class fsi_master_class = { 12942e32c2d6SJeremy Kerr .name = "fsi-master", 1295cf700ba0SJeremy Kerr .dev_groups = master_groups, 12962e32c2d6SJeremy Kerr }; 12972e32c2d6SJeremy Kerr 129809aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 129909aecfabSJeremy Kerr { 130009aecfabSJeremy Kerr int rc; 1301f3aa2c6fSChristopher Bostic struct device_node *np; 130209aecfabSJeremy Kerr 13039840fcd8SBenjamin Herrenschmidt mutex_init(&master->scan_lock); 130409aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 130535af9fb4SJiasheng Jiang if (master->idx < 0) 130635af9fb4SJiasheng Jiang return master->idx; 130735af9fb4SJiasheng Jiang 130809aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 13092e32c2d6SJeremy Kerr master->dev.class = &fsi_master_class; 131009aecfabSJeremy Kerr 131109aecfabSJeremy Kerr rc = device_register(&master->dev); 1312414c1026SJeremy Kerr if (rc) { 131309aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 131409aecfabSJeremy Kerr return rc; 131509aecfabSJeremy Kerr } 1316414c1026SJeremy Kerr 1317f3aa2c6fSChristopher Bostic np = dev_of_node(&master->dev); 13189840fcd8SBenjamin Herrenschmidt if (!of_property_read_bool(np, "no-scan-on-init")) { 13199840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 1320414c1026SJeremy Kerr fsi_master_scan(master); 13219840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 13229840fcd8SBenjamin Herrenschmidt } 1323cd0fdb5cSChristopher Bostic 1324414c1026SJeremy Kerr return 0; 1325414c1026SJeremy Kerr } 132609aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 132709aecfabSJeremy Kerr 132809aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 132909aecfabSJeremy Kerr { 133009aecfabSJeremy Kerr if (master->idx >= 0) { 133109aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 133209aecfabSJeremy Kerr master->idx = -1; 133309aecfabSJeremy Kerr } 133409aecfabSJeremy Kerr 13359840fcd8SBenjamin Herrenschmidt mutex_lock(&master->scan_lock); 1336cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 13379840fcd8SBenjamin Herrenschmidt mutex_unlock(&master->scan_lock); 133809aecfabSJeremy Kerr device_unregister(&master->dev); 133909aecfabSJeremy Kerr } 134009aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 134109aecfabSJeremy Kerr 13420508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 13430508ad1fSJeremy Kerr 1344dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 1345dd37eed7SJeremy Kerr { 1346dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 1347dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 1348dd37eed7SJeremy Kerr const struct fsi_device_id *id; 1349dd37eed7SJeremy Kerr 1350dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 1351dd37eed7SJeremy Kerr return 0; 1352dd37eed7SJeremy Kerr 1353dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 1354dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 1355dd37eed7SJeremy Kerr continue; 1356dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 1357dd37eed7SJeremy Kerr id->version == fsi_dev->version) 1358dd37eed7SJeremy Kerr return 1; 1359dd37eed7SJeremy Kerr } 1360dd37eed7SJeremy Kerr 1361dd37eed7SJeremy Kerr return 0; 1362dd37eed7SJeremy Kerr } 1363dd37eed7SJeremy Kerr 1364356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 1365356d8009SChristopher Bostic { 1366356d8009SChristopher Bostic if (!fsi_drv) 1367356d8009SChristopher Bostic return -EINVAL; 1368356d8009SChristopher Bostic if (!fsi_drv->id_table) 1369356d8009SChristopher Bostic return -EINVAL; 1370356d8009SChristopher Bostic 1371356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 1372356d8009SChristopher Bostic } 1373356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 1374356d8009SChristopher Bostic 1375356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 1376356d8009SChristopher Bostic { 1377356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 1378356d8009SChristopher Bostic } 1379356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 1380356d8009SChristopher Bostic 13810508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 13820508ad1fSJeremy Kerr .name = "fsi", 1383dd37eed7SJeremy Kerr .match = fsi_bus_match, 13840508ad1fSJeremy Kerr }; 13850508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 13860508ad1fSJeremy Kerr 1387496f8931SJoel Stanley static int __init fsi_init(void) 13880508ad1fSJeremy Kerr { 13890ab5fe53SBenjamin Herrenschmidt int rc; 13900ab5fe53SBenjamin Herrenschmidt 13910ab5fe53SBenjamin Herrenschmidt rc = alloc_chrdev_region(&fsi_base_dev, 0, FSI_CHAR_MAX_DEVICES, "fsi"); 13920ab5fe53SBenjamin Herrenschmidt if (rc) 13930ab5fe53SBenjamin Herrenschmidt return rc; 13940ab5fe53SBenjamin Herrenschmidt rc = bus_register(&fsi_bus_type); 13950ab5fe53SBenjamin Herrenschmidt if (rc) 13960ab5fe53SBenjamin Herrenschmidt goto fail_bus; 13972e32c2d6SJeremy Kerr 13982e32c2d6SJeremy Kerr rc = class_register(&fsi_master_class); 13992e32c2d6SJeremy Kerr if (rc) 14002e32c2d6SJeremy Kerr goto fail_class; 14012e32c2d6SJeremy Kerr 14020ab5fe53SBenjamin Herrenschmidt return 0; 14030ab5fe53SBenjamin Herrenschmidt 14042e32c2d6SJeremy Kerr fail_class: 14052e32c2d6SJeremy Kerr bus_unregister(&fsi_bus_type); 14060ab5fe53SBenjamin Herrenschmidt fail_bus: 14070ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 14080ab5fe53SBenjamin Herrenschmidt return rc; 14090508ad1fSJeremy Kerr } 1410496f8931SJoel Stanley postcore_initcall(fsi_init); 14110508ad1fSJeremy Kerr 14120508ad1fSJeremy Kerr static void fsi_exit(void) 14130508ad1fSJeremy Kerr { 14142e32c2d6SJeremy Kerr class_unregister(&fsi_master_class); 14150508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 14160ab5fe53SBenjamin Herrenschmidt unregister_chrdev_region(fsi_base_dev, FSI_CHAR_MAX_DEVICES); 14170ab5fe53SBenjamin Herrenschmidt ida_destroy(&fsi_minor_ida); 14180508ad1fSJeremy Kerr } 14190508ad1fSJeremy Kerr module_exit(fsi_exit); 14201fa847d7SJeremy Kerr module_param(discard_errors, int, 0664); 1421acb7e8f7SChristopher Bostic MODULE_LICENSE("GPL"); 14221fa847d7SJeremy Kerr MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); 1423