10508ad1fSJeremy Kerr /* 20508ad1fSJeremy Kerr * FSI core driver 30508ad1fSJeremy Kerr * 40508ad1fSJeremy Kerr * Copyright (C) IBM Corporation 2016 50508ad1fSJeremy Kerr * 60508ad1fSJeremy Kerr * This program is free software; you can redistribute it and/or modify 70508ad1fSJeremy Kerr * it under the terms of the GNU General Public License version 2 as 80508ad1fSJeremy Kerr * published by the Free Software Foundation. 90508ad1fSJeremy Kerr * 100508ad1fSJeremy Kerr * This program is distributed in the hope that it will be useful, 110508ad1fSJeremy Kerr * but WITHOUT ANY WARRANTY; without even the implied warranty of 120508ad1fSJeremy Kerr * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 130508ad1fSJeremy Kerr * GNU General Public License for more details. 140508ad1fSJeremy Kerr */ 150508ad1fSJeremy Kerr 162b545cd8SJeremy Kerr #include <linux/crc4.h> 170508ad1fSJeremy Kerr #include <linux/device.h> 180508ad1fSJeremy Kerr #include <linux/fsi.h> 1909aecfabSJeremy Kerr #include <linux/idr.h> 200508ad1fSJeremy Kerr #include <linux/module.h> 21f6a2f8ebSJeremy Kerr #include <linux/of.h> 222b545cd8SJeremy Kerr #include <linux/slab.h> 23f7ade2a6SJeremy Kerr #include <linux/bitops.h> 240508ad1fSJeremy Kerr 2509aecfabSJeremy Kerr #include "fsi-master.h" 2609aecfabSJeremy Kerr 2766433b05SJeremy Kerr #define CREATE_TRACE_POINTS 2866433b05SJeremy Kerr #include <trace/events/fsi.h> 2966433b05SJeremy Kerr 30f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_NEXT_MASK GENMASK(31, 31) 31f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_MASK GENMASK(23, 16) 32f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_SLOTS_SHIFT 16 33f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_MASK GENMASK(15, 12) 34f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_VERSION_SHIFT 12 35f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_MASK GENMASK(11, 4) 36f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_TYPE_SHIFT 4 37f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_SHIFT 4 38f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_CRC_MASK GENMASK(3, 0) 39f7ade2a6SJeremy Kerr #define FSI_SLAVE_CONF_DATA_BITS 28 40f7ade2a6SJeremy Kerr 414efe37f4SJeremy Kerr #define FSI_PEEK_BASE 0x410 424efe37f4SJeremy Kerr 43f7ade2a6SJeremy Kerr static const int engine_page_size = 0x400; 44f7ade2a6SJeremy Kerr 452b37c3e2SChristopher Bostic #define FSI_SLAVE_BASE 0x800 462b37c3e2SChristopher Bostic 472b37c3e2SChristopher Bostic /* 482b37c3e2SChristopher Bostic * FSI slave engine control register offsets 492b37c3e2SChristopher Bostic */ 502b37c3e2SChristopher Bostic #define FSI_SMODE 0x0 /* R/W: Mode register */ 511fa847d7SJeremy Kerr #define FSI_SISC 0x8 /* R/W: Interrupt condition */ 521fa847d7SJeremy Kerr #define FSI_SSTAT 0x14 /* R : Slave status */ 534af889b0SJeremy Kerr #define FSI_LLMODE 0x100 /* R/W: Link layer mode register */ 542b37c3e2SChristopher Bostic 552b37c3e2SChristopher Bostic /* 562b37c3e2SChristopher Bostic * SMODE fields 572b37c3e2SChristopher Bostic */ 582b37c3e2SChristopher Bostic #define FSI_SMODE_WSC 0x80000000 /* Warm start done */ 592b37c3e2SChristopher Bostic #define FSI_SMODE_ECRC 0x20000000 /* Hw CRC check */ 602b37c3e2SChristopher Bostic #define FSI_SMODE_SID_SHIFT 24 /* ID shift */ 612b37c3e2SChristopher Bostic #define FSI_SMODE_SID_MASK 3 /* ID Mask */ 622b37c3e2SChristopher Bostic #define FSI_SMODE_ED_SHIFT 20 /* Echo delay shift */ 632b37c3e2SChristopher Bostic #define FSI_SMODE_ED_MASK 0xf /* Echo delay mask */ 642b37c3e2SChristopher Bostic #define FSI_SMODE_SD_SHIFT 16 /* Send delay shift */ 652b37c3e2SChristopher Bostic #define FSI_SMODE_SD_MASK 0xf /* Send delay mask */ 662b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_SHIFT 8 /* Clk ratio shift */ 672b37c3e2SChristopher Bostic #define FSI_SMODE_LBCRR_MASK 0xf /* Clk ratio mask */ 682b37c3e2SChristopher Bostic 694af889b0SJeremy Kerr /* 704af889b0SJeremy Kerr * LLMODE fields 714af889b0SJeremy Kerr */ 724af889b0SJeremy Kerr #define FSI_LLMODE_ASYNC 0x1 734af889b0SJeremy Kerr 742b545cd8SJeremy Kerr #define FSI_SLAVE_SIZE_23b 0x800000 752b545cd8SJeremy Kerr 7609aecfabSJeremy Kerr static DEFINE_IDA(master_ida); 7709aecfabSJeremy Kerr 78faf0b116SJeremy Kerr struct fsi_slave { 79faf0b116SJeremy Kerr struct device dev; 80faf0b116SJeremy Kerr struct fsi_master *master; 81faf0b116SJeremy Kerr int id; 82faf0b116SJeremy Kerr int link; 83faf0b116SJeremy Kerr uint32_t size; /* size of slave address space */ 84faf0b116SJeremy Kerr }; 85faf0b116SJeremy Kerr 86cd0fdb5cSChristopher Bostic #define to_fsi_master(d) container_of(d, struct fsi_master, dev) 87faf0b116SJeremy Kerr #define to_fsi_slave(d) container_of(d, struct fsi_slave, dev) 88faf0b116SJeremy Kerr 891fa847d7SJeremy Kerr static const int slave_retries = 2; 901fa847d7SJeremy Kerr static int discard_errors; 911fa847d7SJeremy Kerr 92014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 93014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size); 94014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 95014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size); 961fa847d7SJeremy Kerr static int fsi_master_break(struct fsi_master *master, int link); 97014c2abcSJeremy Kerr 984efe37f4SJeremy Kerr /* 994efe37f4SJeremy Kerr * fsi_device_read() / fsi_device_write() / fsi_device_peek() 1004efe37f4SJeremy Kerr * 1014efe37f4SJeremy Kerr * FSI endpoint-device support 1024efe37f4SJeremy Kerr * 1034efe37f4SJeremy Kerr * Read / write / peek accessors for a client 1044efe37f4SJeremy Kerr * 1054efe37f4SJeremy Kerr * Parameters: 1064efe37f4SJeremy Kerr * dev: Structure passed to FSI client device drivers on probe(). 1074efe37f4SJeremy Kerr * addr: FSI address of given device. Client should pass in its base address 1084efe37f4SJeremy Kerr * plus desired offset to access its register space. 1094efe37f4SJeremy Kerr * val: For read/peek this is the value read at the specified address. For 1104efe37f4SJeremy Kerr * write this is value to write to the specified address. 1114efe37f4SJeremy Kerr * The data in val must be FSI bus endian (big endian). 1124efe37f4SJeremy Kerr * size: Size in bytes of the operation. Sizes supported are 1, 2 and 4 bytes. 1134efe37f4SJeremy Kerr * Addresses must be aligned on size boundaries or an error will result. 1144efe37f4SJeremy Kerr */ 1154efe37f4SJeremy Kerr int fsi_device_read(struct fsi_device *dev, uint32_t addr, void *val, 1164efe37f4SJeremy Kerr size_t size) 1174efe37f4SJeremy Kerr { 1184efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1194efe37f4SJeremy Kerr return -EINVAL; 1204efe37f4SJeremy Kerr 1214efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, dev->addr + addr, val, size); 1224efe37f4SJeremy Kerr } 1234efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_read); 1244efe37f4SJeremy Kerr 1254efe37f4SJeremy Kerr int fsi_device_write(struct fsi_device *dev, uint32_t addr, const void *val, 1264efe37f4SJeremy Kerr size_t size) 1274efe37f4SJeremy Kerr { 1284efe37f4SJeremy Kerr if (addr > dev->size || size > dev->size || addr > dev->size - size) 1294efe37f4SJeremy Kerr return -EINVAL; 1304efe37f4SJeremy Kerr 1314efe37f4SJeremy Kerr return fsi_slave_write(dev->slave, dev->addr + addr, val, size); 1324efe37f4SJeremy Kerr } 1334efe37f4SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_device_write); 1344efe37f4SJeremy Kerr 1354efe37f4SJeremy Kerr int fsi_device_peek(struct fsi_device *dev, void *val) 1364efe37f4SJeremy Kerr { 1374efe37f4SJeremy Kerr uint32_t addr = FSI_PEEK_BASE + ((dev->unit - 2) * sizeof(uint32_t)); 1384efe37f4SJeremy Kerr 1394efe37f4SJeremy Kerr return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t)); 1404efe37f4SJeremy Kerr } 141f7ade2a6SJeremy Kerr 142f7ade2a6SJeremy Kerr static void fsi_device_release(struct device *_device) 143f7ade2a6SJeremy Kerr { 144f7ade2a6SJeremy Kerr struct fsi_device *device = to_fsi_dev(_device); 145f7ade2a6SJeremy Kerr 146f6a2f8ebSJeremy Kerr of_node_put(device->dev.of_node); 147f7ade2a6SJeremy Kerr kfree(device); 148f7ade2a6SJeremy Kerr } 149f7ade2a6SJeremy Kerr 150f7ade2a6SJeremy Kerr static struct fsi_device *fsi_create_device(struct fsi_slave *slave) 151f7ade2a6SJeremy Kerr { 152f7ade2a6SJeremy Kerr struct fsi_device *dev; 153f7ade2a6SJeremy Kerr 154f7ade2a6SJeremy Kerr dev = kzalloc(sizeof(*dev), GFP_KERNEL); 155f7ade2a6SJeremy Kerr if (!dev) 156f7ade2a6SJeremy Kerr return NULL; 157f7ade2a6SJeremy Kerr 158f7ade2a6SJeremy Kerr dev->dev.parent = &slave->dev; 159f7ade2a6SJeremy Kerr dev->dev.bus = &fsi_bus_type; 160f7ade2a6SJeremy Kerr dev->dev.release = fsi_device_release; 161f7ade2a6SJeremy Kerr 162f7ade2a6SJeremy Kerr return dev; 163f7ade2a6SJeremy Kerr } 164f7ade2a6SJeremy Kerr 165414c1026SJeremy Kerr /* FSI slave support */ 166014c2abcSJeremy Kerr static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp, 167014c2abcSJeremy Kerr uint8_t *idp) 168014c2abcSJeremy Kerr { 169014c2abcSJeremy Kerr uint32_t addr = *addrp; 170014c2abcSJeremy Kerr uint8_t id = *idp; 171014c2abcSJeremy Kerr 172014c2abcSJeremy Kerr if (addr > slave->size) 173014c2abcSJeremy Kerr return -EINVAL; 174014c2abcSJeremy Kerr 175014c2abcSJeremy Kerr /* For 23 bit addressing, we encode the extra two bits in the slave 176014c2abcSJeremy Kerr * id (and the slave's actual ID needs to be 0). 177014c2abcSJeremy Kerr */ 178014c2abcSJeremy Kerr if (addr > 0x1fffff) { 179014c2abcSJeremy Kerr if (slave->id != 0) 180014c2abcSJeremy Kerr return -EINVAL; 181014c2abcSJeremy Kerr id = (addr >> 21) & 0x3; 182014c2abcSJeremy Kerr addr &= 0x1fffff; 183014c2abcSJeremy Kerr } 184014c2abcSJeremy Kerr 185014c2abcSJeremy Kerr *addrp = addr; 186014c2abcSJeremy Kerr *idp = id; 187014c2abcSJeremy Kerr return 0; 188014c2abcSJeremy Kerr } 189014c2abcSJeremy Kerr 190ed50a089SColin Ian King static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave) 1911fa847d7SJeremy Kerr { 1921fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 19311454d6dSJoel Stanley __be32 irq, stat; 1941fa847d7SJeremy Kerr int rc, link; 1951fa847d7SJeremy Kerr uint8_t id; 1961fa847d7SJeremy Kerr 1971fa847d7SJeremy Kerr link = slave->link; 1981fa847d7SJeremy Kerr id = slave->id; 1991fa847d7SJeremy Kerr 2001fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2011fa847d7SJeremy Kerr &irq, sizeof(irq)); 2021fa847d7SJeremy Kerr if (rc) 2031fa847d7SJeremy Kerr return rc; 2041fa847d7SJeremy Kerr 2051fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, FSI_SLAVE_BASE + FSI_SSTAT, 2061fa847d7SJeremy Kerr &stat, sizeof(stat)); 2071fa847d7SJeremy Kerr if (rc) 2081fa847d7SJeremy Kerr return rc; 2091fa847d7SJeremy Kerr 210638bd9acSChristopher Bostic dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n", 2111fa847d7SJeremy Kerr be32_to_cpu(stat), be32_to_cpu(irq)); 2121fa847d7SJeremy Kerr 2131fa847d7SJeremy Kerr /* clear interrupts */ 2141fa847d7SJeremy Kerr return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC, 2151fa847d7SJeremy Kerr &irq, sizeof(irq)); 2161fa847d7SJeremy Kerr } 2171fa847d7SJeremy Kerr 218935f9636SBenjamin Herrenschmidt /* Encode slave local bus echo delay */ 219935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_echodly(int x) 220935f9636SBenjamin Herrenschmidt { 221935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_ED_MASK) << FSI_SMODE_ED_SHIFT; 222935f9636SBenjamin Herrenschmidt } 223935f9636SBenjamin Herrenschmidt 224935f9636SBenjamin Herrenschmidt /* Encode slave local bus send delay */ 225935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_senddly(int x) 226935f9636SBenjamin Herrenschmidt { 227935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SD_MASK) << FSI_SMODE_SD_SHIFT; 228935f9636SBenjamin Herrenschmidt } 229935f9636SBenjamin Herrenschmidt 230935f9636SBenjamin Herrenschmidt /* Encode slave local bus clock rate ratio */ 231935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_lbcrr(int x) 232935f9636SBenjamin Herrenschmidt { 233935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_LBCRR_MASK) << FSI_SMODE_LBCRR_SHIFT; 234935f9636SBenjamin Herrenschmidt } 235935f9636SBenjamin Herrenschmidt 236935f9636SBenjamin Herrenschmidt /* Encode slave ID */ 237935f9636SBenjamin Herrenschmidt static inline uint32_t fsi_smode_sid(int x) 238935f9636SBenjamin Herrenschmidt { 239935f9636SBenjamin Herrenschmidt return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT; 240935f9636SBenjamin Herrenschmidt } 241935f9636SBenjamin Herrenschmidt 242935f9636SBenjamin Herrenschmidt static uint32_t fsi_slave_smode(int id) 243935f9636SBenjamin Herrenschmidt { 244935f9636SBenjamin Herrenschmidt return FSI_SMODE_WSC | FSI_SMODE_ECRC 245935f9636SBenjamin Herrenschmidt | fsi_smode_sid(id) 246935f9636SBenjamin Herrenschmidt | fsi_smode_echodly(0xf) | fsi_smode_senddly(0xf) 247935f9636SBenjamin Herrenschmidt | fsi_smode_lbcrr(0x8); 248935f9636SBenjamin Herrenschmidt } 249935f9636SBenjamin Herrenschmidt 250935f9636SBenjamin Herrenschmidt static int fsi_slave_set_smode(struct fsi_master *master, int link, int id) 251935f9636SBenjamin Herrenschmidt { 252935f9636SBenjamin Herrenschmidt uint32_t smode; 253935f9636SBenjamin Herrenschmidt __be32 data; 254935f9636SBenjamin Herrenschmidt 255935f9636SBenjamin Herrenschmidt /* set our smode register with the slave ID field to 0; this enables 256935f9636SBenjamin Herrenschmidt * extended slave addressing 257935f9636SBenjamin Herrenschmidt */ 258935f9636SBenjamin Herrenschmidt smode = fsi_slave_smode(id); 259935f9636SBenjamin Herrenschmidt data = cpu_to_be32(smode); 260935f9636SBenjamin Herrenschmidt 261935f9636SBenjamin Herrenschmidt return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SMODE, 262935f9636SBenjamin Herrenschmidt &data, sizeof(data)); 263935f9636SBenjamin Herrenschmidt } 2641fa847d7SJeremy Kerr 265ed50a089SColin Ian King static int fsi_slave_handle_error(struct fsi_slave *slave, bool write, 266ed50a089SColin Ian King uint32_t addr, size_t size) 2671fa847d7SJeremy Kerr { 2681fa847d7SJeremy Kerr struct fsi_master *master = slave->master; 2691fa847d7SJeremy Kerr int rc, link; 2701fa847d7SJeremy Kerr uint32_t reg; 2711fa847d7SJeremy Kerr uint8_t id; 2721fa847d7SJeremy Kerr 2731fa847d7SJeremy Kerr if (discard_errors) 2741fa847d7SJeremy Kerr return -1; 2751fa847d7SJeremy Kerr 2761fa847d7SJeremy Kerr link = slave->link; 2771fa847d7SJeremy Kerr id = slave->id; 2781fa847d7SJeremy Kerr 2791fa847d7SJeremy Kerr dev_dbg(&slave->dev, "handling error on %s to 0x%08x[%zd]", 2801fa847d7SJeremy Kerr write ? "write" : "read", addr, size); 2811fa847d7SJeremy Kerr 2821fa847d7SJeremy Kerr /* try a simple clear of error conditions, which may fail if we've lost 2831fa847d7SJeremy Kerr * communication with the slave 2841fa847d7SJeremy Kerr */ 2851fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 2861fa847d7SJeremy Kerr if (!rc) 2871fa847d7SJeremy Kerr return 0; 2881fa847d7SJeremy Kerr 2891fa847d7SJeremy Kerr /* send a TERM and retry */ 2901fa847d7SJeremy Kerr if (master->term) { 2911fa847d7SJeremy Kerr rc = master->term(master, link, id); 2921fa847d7SJeremy Kerr if (!rc) { 2931fa847d7SJeremy Kerr rc = fsi_master_read(master, link, id, 0, 2941fa847d7SJeremy Kerr ®, sizeof(reg)); 2951fa847d7SJeremy Kerr if (!rc) 2961fa847d7SJeremy Kerr rc = fsi_slave_report_and_clear_errors(slave); 2971fa847d7SJeremy Kerr if (!rc) 2981fa847d7SJeremy Kerr return 0; 2991fa847d7SJeremy Kerr } 3001fa847d7SJeremy Kerr } 3011fa847d7SJeremy Kerr 3021fa847d7SJeremy Kerr /* getting serious, reset the slave via BREAK */ 3031fa847d7SJeremy Kerr rc = fsi_master_break(master, link); 3041fa847d7SJeremy Kerr if (rc) 3051fa847d7SJeremy Kerr return rc; 3061fa847d7SJeremy Kerr 3071fa847d7SJeremy Kerr rc = fsi_slave_set_smode(master, link, id); 3081fa847d7SJeremy Kerr if (rc) 3091fa847d7SJeremy Kerr return rc; 3101fa847d7SJeremy Kerr 3111fa847d7SJeremy Kerr return fsi_slave_report_and_clear_errors(slave); 3121fa847d7SJeremy Kerr } 3131fa847d7SJeremy Kerr 314da36cadfSJeremy Kerr int fsi_slave_read(struct fsi_slave *slave, uint32_t addr, 315014c2abcSJeremy Kerr void *val, size_t size) 316014c2abcSJeremy Kerr { 317014c2abcSJeremy Kerr uint8_t id = slave->id; 3181fa847d7SJeremy Kerr int rc, err_rc, i; 319014c2abcSJeremy Kerr 320014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 321014c2abcSJeremy Kerr if (rc) 322014c2abcSJeremy Kerr return rc; 323014c2abcSJeremy Kerr 3241fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3251fa847d7SJeremy Kerr rc = fsi_master_read(slave->master, slave->link, 3261fa847d7SJeremy Kerr id, addr, val, size); 3271fa847d7SJeremy Kerr if (!rc) 3281fa847d7SJeremy Kerr break; 3291fa847d7SJeremy Kerr 3301fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, false, addr, size); 3311fa847d7SJeremy Kerr if (err_rc) 3321fa847d7SJeremy Kerr break; 3331fa847d7SJeremy Kerr } 3341fa847d7SJeremy Kerr 3351fa847d7SJeremy Kerr return rc; 336014c2abcSJeremy Kerr } 337da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_read); 338014c2abcSJeremy Kerr 339da36cadfSJeremy Kerr int fsi_slave_write(struct fsi_slave *slave, uint32_t addr, 340014c2abcSJeremy Kerr const void *val, size_t size) 341014c2abcSJeremy Kerr { 342014c2abcSJeremy Kerr uint8_t id = slave->id; 3431fa847d7SJeremy Kerr int rc, err_rc, i; 344014c2abcSJeremy Kerr 345014c2abcSJeremy Kerr rc = fsi_slave_calc_addr(slave, &addr, &id); 346014c2abcSJeremy Kerr if (rc) 347014c2abcSJeremy Kerr return rc; 348014c2abcSJeremy Kerr 3491fa847d7SJeremy Kerr for (i = 0; i < slave_retries; i++) { 3501fa847d7SJeremy Kerr rc = fsi_master_write(slave->master, slave->link, 3511fa847d7SJeremy Kerr id, addr, val, size); 3521fa847d7SJeremy Kerr if (!rc) 3531fa847d7SJeremy Kerr break; 3541fa847d7SJeremy Kerr 3551fa847d7SJeremy Kerr err_rc = fsi_slave_handle_error(slave, true, addr, size); 3561fa847d7SJeremy Kerr if (err_rc) 3571fa847d7SJeremy Kerr break; 3581fa847d7SJeremy Kerr } 3591fa847d7SJeremy Kerr 3601fa847d7SJeremy Kerr return rc; 361014c2abcSJeremy Kerr } 362da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_write); 363da36cadfSJeremy Kerr 364da36cadfSJeremy Kerr extern int fsi_slave_claim_range(struct fsi_slave *slave, 365da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 366da36cadfSJeremy Kerr { 367da36cadfSJeremy Kerr if (addr + size < addr) 368da36cadfSJeremy Kerr return -EINVAL; 369da36cadfSJeremy Kerr 370da36cadfSJeremy Kerr if (addr + size > slave->size) 371da36cadfSJeremy Kerr return -EINVAL; 372da36cadfSJeremy Kerr 373da36cadfSJeremy Kerr /* todo: check for overlapping claims */ 374da36cadfSJeremy Kerr return 0; 375da36cadfSJeremy Kerr } 376da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_claim_range); 377da36cadfSJeremy Kerr 378da36cadfSJeremy Kerr extern void fsi_slave_release_range(struct fsi_slave *slave, 379da36cadfSJeremy Kerr uint32_t addr, uint32_t size) 380da36cadfSJeremy Kerr { 381da36cadfSJeremy Kerr } 382da36cadfSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_slave_release_range); 383014c2abcSJeremy Kerr 384f6a2f8ebSJeremy Kerr static bool fsi_device_node_matches(struct device *dev, struct device_node *np, 385f6a2f8ebSJeremy Kerr uint32_t addr, uint32_t size) 386f6a2f8ebSJeremy Kerr { 387f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 388f6a2f8ebSJeremy Kerr const __be32 *prop; 389f6a2f8ebSJeremy Kerr uint32_t psize; 390f6a2f8ebSJeremy Kerr 391f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 392f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 393f6a2f8ebSJeremy Kerr 394f6a2f8ebSJeremy Kerr if (na != 1 || ns != 1) 395f6a2f8ebSJeremy Kerr return false; 396f6a2f8ebSJeremy Kerr 397f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 398f6a2f8ebSJeremy Kerr if (!prop || len != 8) 399f6a2f8ebSJeremy Kerr return false; 400f6a2f8ebSJeremy Kerr 401f6a2f8ebSJeremy Kerr if (of_read_number(prop, 1) != addr) 402f6a2f8ebSJeremy Kerr return false; 403f6a2f8ebSJeremy Kerr 404f6a2f8ebSJeremy Kerr psize = of_read_number(prop + 1, 1); 405f6a2f8ebSJeremy Kerr if (psize != size) { 406f6a2f8ebSJeremy Kerr dev_warn(dev, 407f6a2f8ebSJeremy Kerr "node %s matches probed address, but not size (got 0x%x, expected 0x%x)", 408f6a2f8ebSJeremy Kerr of_node_full_name(np), psize, size); 409f6a2f8ebSJeremy Kerr } 410f6a2f8ebSJeremy Kerr 411f6a2f8ebSJeremy Kerr return true; 412f6a2f8ebSJeremy Kerr } 413f6a2f8ebSJeremy Kerr 414f6a2f8ebSJeremy Kerr /* Find a matching node for the slave engine at @address, using @size bytes 415f6a2f8ebSJeremy Kerr * of space. Returns NULL if not found, or a matching node with refcount 416f6a2f8ebSJeremy Kerr * already incremented. 417f6a2f8ebSJeremy Kerr */ 418f6a2f8ebSJeremy Kerr static struct device_node *fsi_device_find_of_node(struct fsi_device *dev) 419f6a2f8ebSJeremy Kerr { 420f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 421f6a2f8ebSJeremy Kerr 422f6a2f8ebSJeremy Kerr parent = dev_of_node(&dev->slave->dev); 423f6a2f8ebSJeremy Kerr if (!parent) 424f6a2f8ebSJeremy Kerr return NULL; 425f6a2f8ebSJeremy Kerr 426f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 427f6a2f8ebSJeremy Kerr if (fsi_device_node_matches(&dev->dev, np, 428f6a2f8ebSJeremy Kerr dev->addr, dev->size)) 429f6a2f8ebSJeremy Kerr return np; 430f6a2f8ebSJeremy Kerr } 431f6a2f8ebSJeremy Kerr 432f6a2f8ebSJeremy Kerr return NULL; 433f6a2f8ebSJeremy Kerr } 434f6a2f8ebSJeremy Kerr 435f7ade2a6SJeremy Kerr static int fsi_slave_scan(struct fsi_slave *slave) 436f7ade2a6SJeremy Kerr { 437f7ade2a6SJeremy Kerr uint32_t engine_addr; 438f7ade2a6SJeremy Kerr int rc, i; 439f7ade2a6SJeremy Kerr 440f7ade2a6SJeremy Kerr /* 441f7ade2a6SJeremy Kerr * scan engines 442f7ade2a6SJeremy Kerr * 443f7ade2a6SJeremy Kerr * We keep the peek mode and slave engines for the core; so start 444f7ade2a6SJeremy Kerr * at the third slot in the configuration table. We also need to 445f7ade2a6SJeremy Kerr * skip the chip ID entry at the start of the address space. 446f7ade2a6SJeremy Kerr */ 447f7ade2a6SJeremy Kerr engine_addr = engine_page_size * 3; 448f7ade2a6SJeremy Kerr for (i = 2; i < engine_page_size / sizeof(uint32_t); i++) { 449f7ade2a6SJeremy Kerr uint8_t slots, version, type, crc; 450f7ade2a6SJeremy Kerr struct fsi_device *dev; 45111454d6dSJoel Stanley uint32_t conf; 45211454d6dSJoel Stanley __be32 data; 453f7ade2a6SJeremy Kerr 45411454d6dSJoel Stanley rc = fsi_slave_read(slave, (i + 1) * sizeof(data), 45511454d6dSJoel Stanley &data, sizeof(data)); 456f7ade2a6SJeremy Kerr if (rc) { 457f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 458f7ade2a6SJeremy Kerr "error reading slave registers\n"); 459f7ade2a6SJeremy Kerr return -1; 460f7ade2a6SJeremy Kerr } 46111454d6dSJoel Stanley conf = be32_to_cpu(data); 462f7ade2a6SJeremy Kerr 463f7ade2a6SJeremy Kerr crc = crc4(0, conf, 32); 464f7ade2a6SJeremy Kerr if (crc) { 465f7ade2a6SJeremy Kerr dev_warn(&slave->dev, 466f7ade2a6SJeremy Kerr "crc error in slave register at 0x%04x\n", 467f7ade2a6SJeremy Kerr i); 468f7ade2a6SJeremy Kerr return -1; 469f7ade2a6SJeremy Kerr } 470f7ade2a6SJeremy Kerr 471f7ade2a6SJeremy Kerr slots = (conf & FSI_SLAVE_CONF_SLOTS_MASK) 472f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_SLOTS_SHIFT; 473f7ade2a6SJeremy Kerr version = (conf & FSI_SLAVE_CONF_VERSION_MASK) 474f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_VERSION_SHIFT; 475f7ade2a6SJeremy Kerr type = (conf & FSI_SLAVE_CONF_TYPE_MASK) 476f7ade2a6SJeremy Kerr >> FSI_SLAVE_CONF_TYPE_SHIFT; 477f7ade2a6SJeremy Kerr 478f7ade2a6SJeremy Kerr /* 479f7ade2a6SJeremy Kerr * Unused address areas are marked by a zero type value; this 480f7ade2a6SJeremy Kerr * skips the defined address areas 481f7ade2a6SJeremy Kerr */ 482f7ade2a6SJeremy Kerr if (type != 0 && slots != 0) { 483f7ade2a6SJeremy Kerr 484f7ade2a6SJeremy Kerr /* create device */ 485f7ade2a6SJeremy Kerr dev = fsi_create_device(slave); 486f7ade2a6SJeremy Kerr if (!dev) 487f7ade2a6SJeremy Kerr return -ENOMEM; 488f7ade2a6SJeremy Kerr 489f7ade2a6SJeremy Kerr dev->slave = slave; 490f7ade2a6SJeremy Kerr dev->engine_type = type; 491f7ade2a6SJeremy Kerr dev->version = version; 492f7ade2a6SJeremy Kerr dev->unit = i; 493f7ade2a6SJeremy Kerr dev->addr = engine_addr; 494f7ade2a6SJeremy Kerr dev->size = slots * engine_page_size; 495f7ade2a6SJeremy Kerr 496f7ade2a6SJeremy Kerr dev_dbg(&slave->dev, 497f7ade2a6SJeremy Kerr "engine[%i]: type %x, version %x, addr %x size %x\n", 498f7ade2a6SJeremy Kerr dev->unit, dev->engine_type, version, 499f7ade2a6SJeremy Kerr dev->addr, dev->size); 500f7ade2a6SJeremy Kerr 501f7ade2a6SJeremy Kerr dev_set_name(&dev->dev, "%02x:%02x:%02x:%02x", 502f7ade2a6SJeremy Kerr slave->master->idx, slave->link, 503f7ade2a6SJeremy Kerr slave->id, i - 2); 504f6a2f8ebSJeremy Kerr dev->dev.of_node = fsi_device_find_of_node(dev); 505f7ade2a6SJeremy Kerr 506f7ade2a6SJeremy Kerr rc = device_register(&dev->dev); 507f7ade2a6SJeremy Kerr if (rc) { 508f7ade2a6SJeremy Kerr dev_warn(&slave->dev, "add failed: %d\n", rc); 509f7ade2a6SJeremy Kerr put_device(&dev->dev); 510f7ade2a6SJeremy Kerr } 511f7ade2a6SJeremy Kerr } 512f7ade2a6SJeremy Kerr 513f7ade2a6SJeremy Kerr engine_addr += slots * engine_page_size; 514f7ade2a6SJeremy Kerr 515f7ade2a6SJeremy Kerr if (!(conf & FSI_SLAVE_CONF_NEXT_MASK)) 516f7ade2a6SJeremy Kerr break; 517f7ade2a6SJeremy Kerr } 518f7ade2a6SJeremy Kerr 519f7ade2a6SJeremy Kerr return 0; 520f7ade2a6SJeremy Kerr } 521f7ade2a6SJeremy Kerr 522125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_read(struct file *file, 523125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, char *buf, 524125739cbSJeremy Kerr loff_t off, size_t count) 525125739cbSJeremy Kerr { 526125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 527125739cbSJeremy Kerr size_t total_len, read_len; 528125739cbSJeremy Kerr int rc; 529125739cbSJeremy Kerr 530125739cbSJeremy Kerr if (off < 0) 531125739cbSJeremy Kerr return -EINVAL; 532125739cbSJeremy Kerr 533125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 534125739cbSJeremy Kerr return -EINVAL; 535125739cbSJeremy Kerr 536125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += read_len) { 537125739cbSJeremy Kerr read_len = min_t(size_t, count, 4); 538125739cbSJeremy Kerr read_len -= off & 0x3; 539125739cbSJeremy Kerr 540125739cbSJeremy Kerr rc = fsi_slave_read(slave, off, buf + total_len, read_len); 541125739cbSJeremy Kerr if (rc) 542125739cbSJeremy Kerr return rc; 543125739cbSJeremy Kerr 544125739cbSJeremy Kerr off += read_len; 545125739cbSJeremy Kerr } 546125739cbSJeremy Kerr 547125739cbSJeremy Kerr return count; 548125739cbSJeremy Kerr } 549125739cbSJeremy Kerr 550125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_raw_write(struct file *file, 551125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 552125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 553125739cbSJeremy Kerr { 554125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 555125739cbSJeremy Kerr size_t total_len, write_len; 556125739cbSJeremy Kerr int rc; 557125739cbSJeremy Kerr 558125739cbSJeremy Kerr if (off < 0) 559125739cbSJeremy Kerr return -EINVAL; 560125739cbSJeremy Kerr 561125739cbSJeremy Kerr if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff) 562125739cbSJeremy Kerr return -EINVAL; 563125739cbSJeremy Kerr 564125739cbSJeremy Kerr for (total_len = 0; total_len < count; total_len += write_len) { 565125739cbSJeremy Kerr write_len = min_t(size_t, count, 4); 566125739cbSJeremy Kerr write_len -= off & 0x3; 567125739cbSJeremy Kerr 568125739cbSJeremy Kerr rc = fsi_slave_write(slave, off, buf + total_len, write_len); 569125739cbSJeremy Kerr if (rc) 570125739cbSJeremy Kerr return rc; 571125739cbSJeremy Kerr 572125739cbSJeremy Kerr off += write_len; 573125739cbSJeremy Kerr } 574125739cbSJeremy Kerr 575125739cbSJeremy Kerr return count; 576125739cbSJeremy Kerr } 577125739cbSJeremy Kerr 578061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_raw_attr = { 579125739cbSJeremy Kerr .attr = { 580125739cbSJeremy Kerr .name = "raw", 581125739cbSJeremy Kerr .mode = 0600, 582125739cbSJeremy Kerr }, 583125739cbSJeremy Kerr .size = 0, 584125739cbSJeremy Kerr .read = fsi_slave_sysfs_raw_read, 585125739cbSJeremy Kerr .write = fsi_slave_sysfs_raw_write, 586125739cbSJeremy Kerr }; 587125739cbSJeremy Kerr 588125739cbSJeremy Kerr static ssize_t fsi_slave_sysfs_term_write(struct file *file, 589125739cbSJeremy Kerr struct kobject *kobj, struct bin_attribute *attr, 590125739cbSJeremy Kerr char *buf, loff_t off, size_t count) 591125739cbSJeremy Kerr { 592125739cbSJeremy Kerr struct fsi_slave *slave = to_fsi_slave(kobj_to_dev(kobj)); 593125739cbSJeremy Kerr struct fsi_master *master = slave->master; 594125739cbSJeremy Kerr 595125739cbSJeremy Kerr if (!master->term) 596125739cbSJeremy Kerr return -ENODEV; 597125739cbSJeremy Kerr 598125739cbSJeremy Kerr master->term(master, slave->link, slave->id); 599125739cbSJeremy Kerr return count; 600125739cbSJeremy Kerr } 601125739cbSJeremy Kerr 602061c0958SBhumika Goyal static const struct bin_attribute fsi_slave_term_attr = { 603125739cbSJeremy Kerr .attr = { 604125739cbSJeremy Kerr .name = "term", 605125739cbSJeremy Kerr .mode = 0200, 606125739cbSJeremy Kerr }, 607125739cbSJeremy Kerr .size = 0, 608125739cbSJeremy Kerr .write = fsi_slave_sysfs_term_write, 609125739cbSJeremy Kerr }; 610125739cbSJeremy Kerr 6112b545cd8SJeremy Kerr static void fsi_slave_release(struct device *dev) 6122b545cd8SJeremy Kerr { 6132b545cd8SJeremy Kerr struct fsi_slave *slave = to_fsi_slave(dev); 6142b545cd8SJeremy Kerr 615f6a2f8ebSJeremy Kerr of_node_put(dev->of_node); 6162b545cd8SJeremy Kerr kfree(slave); 6172b545cd8SJeremy Kerr } 6182b545cd8SJeremy Kerr 619f6a2f8ebSJeremy Kerr static bool fsi_slave_node_matches(struct device_node *np, 620f6a2f8ebSJeremy Kerr int link, uint8_t id) 621f6a2f8ebSJeremy Kerr { 622f6a2f8ebSJeremy Kerr unsigned int len, na, ns; 623f6a2f8ebSJeremy Kerr const __be32 *prop; 624f6a2f8ebSJeremy Kerr 625f6a2f8ebSJeremy Kerr na = of_n_addr_cells(np); 626f6a2f8ebSJeremy Kerr ns = of_n_size_cells(np); 627f6a2f8ebSJeremy Kerr 628f6a2f8ebSJeremy Kerr /* Ensure we have the correct format for addresses and sizes in 629f6a2f8ebSJeremy Kerr * reg properties 630f6a2f8ebSJeremy Kerr */ 631f6a2f8ebSJeremy Kerr if (na != 2 || ns != 0) 632f6a2f8ebSJeremy Kerr return false; 633f6a2f8ebSJeremy Kerr 634f6a2f8ebSJeremy Kerr prop = of_get_property(np, "reg", &len); 635f6a2f8ebSJeremy Kerr if (!prop || len != 8) 636f6a2f8ebSJeremy Kerr return false; 637f6a2f8ebSJeremy Kerr 638f6a2f8ebSJeremy Kerr return (of_read_number(prop, 1) == link) && 639f6a2f8ebSJeremy Kerr (of_read_number(prop + 1, 1) == id); 640f6a2f8ebSJeremy Kerr } 641f6a2f8ebSJeremy Kerr 642f6a2f8ebSJeremy Kerr /* Find a matching node for the slave at (link, id). Returns NULL if none 643f6a2f8ebSJeremy Kerr * found, or a matching node with refcount already incremented. 644f6a2f8ebSJeremy Kerr */ 645f6a2f8ebSJeremy Kerr static struct device_node *fsi_slave_find_of_node(struct fsi_master *master, 646f6a2f8ebSJeremy Kerr int link, uint8_t id) 647f6a2f8ebSJeremy Kerr { 648f6a2f8ebSJeremy Kerr struct device_node *parent, *np; 649f6a2f8ebSJeremy Kerr 650f6a2f8ebSJeremy Kerr parent = dev_of_node(&master->dev); 651f6a2f8ebSJeremy Kerr if (!parent) 652f6a2f8ebSJeremy Kerr return NULL; 653f6a2f8ebSJeremy Kerr 654f6a2f8ebSJeremy Kerr for_each_child_of_node(parent, np) { 655f6a2f8ebSJeremy Kerr if (fsi_slave_node_matches(np, link, id)) 656f6a2f8ebSJeremy Kerr return np; 657f6a2f8ebSJeremy Kerr } 658f6a2f8ebSJeremy Kerr 659f6a2f8ebSJeremy Kerr return NULL; 660f6a2f8ebSJeremy Kerr } 661f6a2f8ebSJeremy Kerr 662414c1026SJeremy Kerr static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) 663414c1026SJeremy Kerr { 66411454d6dSJoel Stanley uint32_t chip_id; 6652b545cd8SJeremy Kerr struct fsi_slave *slave; 6662b545cd8SJeremy Kerr uint8_t crc; 66711454d6dSJoel Stanley __be32 data, llmode; 6682b545cd8SJeremy Kerr int rc; 669414c1026SJeremy Kerr 6702b545cd8SJeremy Kerr /* Currently, we only support single slaves on a link, and use the 6712b545cd8SJeremy Kerr * full 23-bit address range 6722b545cd8SJeremy Kerr */ 6732b545cd8SJeremy Kerr if (id != 0) 6742b545cd8SJeremy Kerr return -EINVAL; 6752b545cd8SJeremy Kerr 67611454d6dSJoel Stanley rc = fsi_master_read(master, link, id, 0, &data, sizeof(data)); 6772b545cd8SJeremy Kerr if (rc) { 6782b545cd8SJeremy Kerr dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n", 6792b545cd8SJeremy Kerr link, id, rc); 680414c1026SJeremy Kerr return -ENODEV; 681414c1026SJeremy Kerr } 68211454d6dSJoel Stanley chip_id = be32_to_cpu(data); 6832b545cd8SJeremy Kerr 6842b545cd8SJeremy Kerr crc = crc4(0, chip_id, 32); 6852b545cd8SJeremy Kerr if (crc) { 6862b545cd8SJeremy Kerr dev_warn(&master->dev, "slave %02x:%02x invalid chip id CRC!\n", 6872b545cd8SJeremy Kerr link, id); 6882b545cd8SJeremy Kerr return -EIO; 6892b545cd8SJeremy Kerr } 6902b545cd8SJeremy Kerr 691638bd9acSChristopher Bostic dev_dbg(&master->dev, "fsi: found chip %08x at %02x:%02x:%02x\n", 6922b545cd8SJeremy Kerr chip_id, master->idx, link, id); 6932b545cd8SJeremy Kerr 6942b37c3e2SChristopher Bostic rc = fsi_slave_set_smode(master, link, id); 6952b37c3e2SChristopher Bostic if (rc) { 6962b37c3e2SChristopher Bostic dev_warn(&master->dev, 6972b37c3e2SChristopher Bostic "can't set smode on slave:%02x:%02x %d\n", 6982b37c3e2SChristopher Bostic link, id, rc); 6992b37c3e2SChristopher Bostic return -ENODEV; 7002b37c3e2SChristopher Bostic } 7012b37c3e2SChristopher Bostic 7024af889b0SJeremy Kerr /* If we're behind a master that doesn't provide a self-running bus 7034af889b0SJeremy Kerr * clock, put the slave into async mode 7044af889b0SJeremy Kerr */ 7054af889b0SJeremy Kerr if (master->flags & FSI_MASTER_FLAG_SWCLOCK) { 7064af889b0SJeremy Kerr llmode = cpu_to_be32(FSI_LLMODE_ASYNC); 7074af889b0SJeremy Kerr rc = fsi_master_write(master, link, id, 7084af889b0SJeremy Kerr FSI_SLAVE_BASE + FSI_LLMODE, 7094af889b0SJeremy Kerr &llmode, sizeof(llmode)); 7104af889b0SJeremy Kerr if (rc) 7114af889b0SJeremy Kerr dev_warn(&master->dev, 7124af889b0SJeremy Kerr "can't set llmode on slave:%02x:%02x %d\n", 7134af889b0SJeremy Kerr link, id, rc); 7144af889b0SJeremy Kerr } 7154af889b0SJeremy Kerr 7162b545cd8SJeremy Kerr /* We can communicate with a slave; create the slave device and 7172b545cd8SJeremy Kerr * register. 7182b545cd8SJeremy Kerr */ 7192b545cd8SJeremy Kerr slave = kzalloc(sizeof(*slave), GFP_KERNEL); 7202b545cd8SJeremy Kerr if (!slave) 7212b545cd8SJeremy Kerr return -ENOMEM; 7222b545cd8SJeremy Kerr 7232b545cd8SJeremy Kerr slave->master = master; 7242b545cd8SJeremy Kerr slave->dev.parent = &master->dev; 725f6a2f8ebSJeremy Kerr slave->dev.of_node = fsi_slave_find_of_node(master, link, id); 7262b545cd8SJeremy Kerr slave->dev.release = fsi_slave_release; 7272b545cd8SJeremy Kerr slave->link = link; 7282b545cd8SJeremy Kerr slave->id = id; 7292b545cd8SJeremy Kerr slave->size = FSI_SLAVE_SIZE_23b; 7302b545cd8SJeremy Kerr 7312b545cd8SJeremy Kerr dev_set_name(&slave->dev, "slave@%02x:%02x", link, id); 7322b545cd8SJeremy Kerr rc = device_register(&slave->dev); 7332b545cd8SJeremy Kerr if (rc < 0) { 7342b545cd8SJeremy Kerr dev_warn(&master->dev, "failed to create slave device: %d\n", 7352b545cd8SJeremy Kerr rc); 7362b545cd8SJeremy Kerr put_device(&slave->dev); 7372b545cd8SJeremy Kerr return rc; 7382b545cd8SJeremy Kerr } 7392b545cd8SJeremy Kerr 740125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_raw_attr); 741125739cbSJeremy Kerr if (rc) 742125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create raw attr: %d\n", rc); 743125739cbSJeremy Kerr 744125739cbSJeremy Kerr rc = device_create_bin_file(&slave->dev, &fsi_slave_term_attr); 745125739cbSJeremy Kerr if (rc) 746125739cbSJeremy Kerr dev_warn(&slave->dev, "failed to create term attr: %d\n", rc); 747125739cbSJeremy Kerr 748f7ade2a6SJeremy Kerr rc = fsi_slave_scan(slave); 749f7ade2a6SJeremy Kerr if (rc) 750f7ade2a6SJeremy Kerr dev_dbg(&master->dev, "failed during slave scan with: %d\n", 751f7ade2a6SJeremy Kerr rc); 7522b545cd8SJeremy Kerr 7532b545cd8SJeremy Kerr return rc; 7542b545cd8SJeremy Kerr } 755414c1026SJeremy Kerr 75609aecfabSJeremy Kerr /* FSI master support */ 757014c2abcSJeremy Kerr static int fsi_check_access(uint32_t addr, size_t size) 758014c2abcSJeremy Kerr { 75999f039e9SEddie James if (size == 4) { 76099f039e9SEddie James if (addr & 0x3) 761014c2abcSJeremy Kerr return -EINVAL; 76299f039e9SEddie James } else if (size == 2) { 76399f039e9SEddie James if (addr & 0x1) 76499f039e9SEddie James return -EINVAL; 76599f039e9SEddie James } else if (size != 1) 766014c2abcSJeremy Kerr return -EINVAL; 767014c2abcSJeremy Kerr 768014c2abcSJeremy Kerr return 0; 769014c2abcSJeremy Kerr } 770014c2abcSJeremy Kerr 771014c2abcSJeremy Kerr static int fsi_master_read(struct fsi_master *master, int link, 772014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, void *val, size_t size) 773014c2abcSJeremy Kerr { 774014c2abcSJeremy Kerr int rc; 775014c2abcSJeremy Kerr 77666433b05SJeremy Kerr trace_fsi_master_read(master, link, slave_id, addr, size); 777014c2abcSJeremy Kerr 77866433b05SJeremy Kerr rc = fsi_check_access(addr, size); 77966433b05SJeremy Kerr if (!rc) 78066433b05SJeremy Kerr rc = master->read(master, link, slave_id, addr, val, size); 78166433b05SJeremy Kerr 78266433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 78366433b05SJeremy Kerr false, val, rc); 78466433b05SJeremy Kerr 78566433b05SJeremy Kerr return rc; 786014c2abcSJeremy Kerr } 787014c2abcSJeremy Kerr 788014c2abcSJeremy Kerr static int fsi_master_write(struct fsi_master *master, int link, 789014c2abcSJeremy Kerr uint8_t slave_id, uint32_t addr, const void *val, size_t size) 790014c2abcSJeremy Kerr { 791014c2abcSJeremy Kerr int rc; 792014c2abcSJeremy Kerr 79366433b05SJeremy Kerr trace_fsi_master_write(master, link, slave_id, addr, size, val); 794014c2abcSJeremy Kerr 79566433b05SJeremy Kerr rc = fsi_check_access(addr, size); 79666433b05SJeremy Kerr if (!rc) 79766433b05SJeremy Kerr rc = master->write(master, link, slave_id, addr, val, size); 79866433b05SJeremy Kerr 79966433b05SJeremy Kerr trace_fsi_master_rw_result(master, link, slave_id, addr, size, 80066433b05SJeremy Kerr true, val, rc); 80166433b05SJeremy Kerr 80266433b05SJeremy Kerr return rc; 803014c2abcSJeremy Kerr } 804014c2abcSJeremy Kerr 80526095282SChristopher Bostic static int fsi_master_link_enable(struct fsi_master *master, int link) 80626095282SChristopher Bostic { 80726095282SChristopher Bostic if (master->link_enable) 80826095282SChristopher Bostic return master->link_enable(master, link); 80926095282SChristopher Bostic 81026095282SChristopher Bostic return 0; 81126095282SChristopher Bostic } 81226095282SChristopher Bostic 81326095282SChristopher Bostic /* 81426095282SChristopher Bostic * Issue a break command on this link 81526095282SChristopher Bostic */ 81626095282SChristopher Bostic static int fsi_master_break(struct fsi_master *master, int link) 81726095282SChristopher Bostic { 81866433b05SJeremy Kerr trace_fsi_master_break(master, link); 81966433b05SJeremy Kerr 82026095282SChristopher Bostic if (master->send_break) 82126095282SChristopher Bostic return master->send_break(master, link); 82226095282SChristopher Bostic 82326095282SChristopher Bostic return 0; 82426095282SChristopher Bostic } 82526095282SChristopher Bostic 826414c1026SJeremy Kerr static int fsi_master_scan(struct fsi_master *master) 827414c1026SJeremy Kerr { 82826095282SChristopher Bostic int link, rc; 829414c1026SJeremy Kerr 83026095282SChristopher Bostic for (link = 0; link < master->n_links; link++) { 83126095282SChristopher Bostic rc = fsi_master_link_enable(master, link); 83226095282SChristopher Bostic if (rc) { 83326095282SChristopher Bostic dev_dbg(&master->dev, 83426095282SChristopher Bostic "enable link %d failed: %d\n", link, rc); 83526095282SChristopher Bostic continue; 83626095282SChristopher Bostic } 83726095282SChristopher Bostic rc = fsi_master_break(master, link); 83826095282SChristopher Bostic if (rc) { 83926095282SChristopher Bostic dev_dbg(&master->dev, 84026095282SChristopher Bostic "break to link %d failed: %d\n", link, rc); 84126095282SChristopher Bostic continue; 84226095282SChristopher Bostic } 84326095282SChristopher Bostic 844414c1026SJeremy Kerr fsi_slave_init(master, link, 0); 84526095282SChristopher Bostic } 846414c1026SJeremy Kerr 847414c1026SJeremy Kerr return 0; 848414c1026SJeremy Kerr } 849414c1026SJeremy Kerr 850cd0fdb5cSChristopher Bostic static int fsi_slave_remove_device(struct device *dev, void *arg) 851cd0fdb5cSChristopher Bostic { 852cd0fdb5cSChristopher Bostic device_unregister(dev); 853cd0fdb5cSChristopher Bostic return 0; 854cd0fdb5cSChristopher Bostic } 855cd0fdb5cSChristopher Bostic 856cd0fdb5cSChristopher Bostic static int fsi_master_remove_slave(struct device *dev, void *arg) 857cd0fdb5cSChristopher Bostic { 858cd0fdb5cSChristopher Bostic device_for_each_child(dev, NULL, fsi_slave_remove_device); 859cd0fdb5cSChristopher Bostic device_unregister(dev); 860cd0fdb5cSChristopher Bostic return 0; 861cd0fdb5cSChristopher Bostic } 862cd0fdb5cSChristopher Bostic 863cd0fdb5cSChristopher Bostic static void fsi_master_unscan(struct fsi_master *master) 864cd0fdb5cSChristopher Bostic { 865cd0fdb5cSChristopher Bostic device_for_each_child(&master->dev, NULL, fsi_master_remove_slave); 866cd0fdb5cSChristopher Bostic } 867cd0fdb5cSChristopher Bostic 86815362d69SJeremy Kerr int fsi_master_rescan(struct fsi_master *master) 86915362d69SJeremy Kerr { 87015362d69SJeremy Kerr fsi_master_unscan(master); 87115362d69SJeremy Kerr return fsi_master_scan(master); 87215362d69SJeremy Kerr } 87315362d69SJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_rescan); 87415362d69SJeremy Kerr 875cd0fdb5cSChristopher Bostic static ssize_t master_rescan_store(struct device *dev, 876cd0fdb5cSChristopher Bostic struct device_attribute *attr, const char *buf, size_t count) 877cd0fdb5cSChristopher Bostic { 878cd0fdb5cSChristopher Bostic struct fsi_master *master = to_fsi_master(dev); 879cd0fdb5cSChristopher Bostic int rc; 880cd0fdb5cSChristopher Bostic 88115362d69SJeremy Kerr rc = fsi_master_rescan(master); 882cd0fdb5cSChristopher Bostic if (rc < 0) 883cd0fdb5cSChristopher Bostic return rc; 884cd0fdb5cSChristopher Bostic 885cd0fdb5cSChristopher Bostic return count; 886cd0fdb5cSChristopher Bostic } 887cd0fdb5cSChristopher Bostic 888cd0fdb5cSChristopher Bostic static DEVICE_ATTR(rescan, 0200, NULL, master_rescan_store); 889cd0fdb5cSChristopher Bostic 890125739cbSJeremy Kerr static ssize_t master_break_store(struct device *dev, 891125739cbSJeremy Kerr struct device_attribute *attr, const char *buf, size_t count) 892125739cbSJeremy Kerr { 893125739cbSJeremy Kerr struct fsi_master *master = to_fsi_master(dev); 894125739cbSJeremy Kerr 895125739cbSJeremy Kerr fsi_master_break(master, 0); 896125739cbSJeremy Kerr 897125739cbSJeremy Kerr return count; 898125739cbSJeremy Kerr } 899125739cbSJeremy Kerr 900125739cbSJeremy Kerr static DEVICE_ATTR(break, 0200, NULL, master_break_store); 901125739cbSJeremy Kerr 90209aecfabSJeremy Kerr int fsi_master_register(struct fsi_master *master) 90309aecfabSJeremy Kerr { 90409aecfabSJeremy Kerr int rc; 905f3aa2c6fSChristopher Bostic struct device_node *np; 90609aecfabSJeremy Kerr 90709aecfabSJeremy Kerr if (!master) 90809aecfabSJeremy Kerr return -EINVAL; 90909aecfabSJeremy Kerr 91009aecfabSJeremy Kerr master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL); 91109aecfabSJeremy Kerr dev_set_name(&master->dev, "fsi%d", master->idx); 91209aecfabSJeremy Kerr 91309aecfabSJeremy Kerr rc = device_register(&master->dev); 914414c1026SJeremy Kerr if (rc) { 91509aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 91609aecfabSJeremy Kerr return rc; 91709aecfabSJeremy Kerr } 918414c1026SJeremy Kerr 919cd0fdb5cSChristopher Bostic rc = device_create_file(&master->dev, &dev_attr_rescan); 920cd0fdb5cSChristopher Bostic if (rc) { 921cd0fdb5cSChristopher Bostic device_unregister(&master->dev); 922cd0fdb5cSChristopher Bostic ida_simple_remove(&master_ida, master->idx); 923cd0fdb5cSChristopher Bostic return rc; 924cd0fdb5cSChristopher Bostic } 925cd0fdb5cSChristopher Bostic 926125739cbSJeremy Kerr rc = device_create_file(&master->dev, &dev_attr_break); 927125739cbSJeremy Kerr if (rc) { 928125739cbSJeremy Kerr device_unregister(&master->dev); 929125739cbSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 930125739cbSJeremy Kerr return rc; 931125739cbSJeremy Kerr } 932125739cbSJeremy Kerr 933f3aa2c6fSChristopher Bostic np = dev_of_node(&master->dev); 934f3aa2c6fSChristopher Bostic if (!of_property_read_bool(np, "no-scan-on-init")) 935414c1026SJeremy Kerr fsi_master_scan(master); 936cd0fdb5cSChristopher Bostic 937414c1026SJeremy Kerr return 0; 938414c1026SJeremy Kerr } 93909aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_register); 94009aecfabSJeremy Kerr 94109aecfabSJeremy Kerr void fsi_master_unregister(struct fsi_master *master) 94209aecfabSJeremy Kerr { 94309aecfabSJeremy Kerr if (master->idx >= 0) { 94409aecfabSJeremy Kerr ida_simple_remove(&master_ida, master->idx); 94509aecfabSJeremy Kerr master->idx = -1; 94609aecfabSJeremy Kerr } 94709aecfabSJeremy Kerr 948cd0fdb5cSChristopher Bostic fsi_master_unscan(master); 94909aecfabSJeremy Kerr device_unregister(&master->dev); 95009aecfabSJeremy Kerr } 95109aecfabSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_master_unregister); 95209aecfabSJeremy Kerr 9530508ad1fSJeremy Kerr /* FSI core & Linux bus type definitions */ 9540508ad1fSJeremy Kerr 955dd37eed7SJeremy Kerr static int fsi_bus_match(struct device *dev, struct device_driver *drv) 956dd37eed7SJeremy Kerr { 957dd37eed7SJeremy Kerr struct fsi_device *fsi_dev = to_fsi_dev(dev); 958dd37eed7SJeremy Kerr struct fsi_driver *fsi_drv = to_fsi_drv(drv); 959dd37eed7SJeremy Kerr const struct fsi_device_id *id; 960dd37eed7SJeremy Kerr 961dd37eed7SJeremy Kerr if (!fsi_drv->id_table) 962dd37eed7SJeremy Kerr return 0; 963dd37eed7SJeremy Kerr 964dd37eed7SJeremy Kerr for (id = fsi_drv->id_table; id->engine_type; id++) { 965dd37eed7SJeremy Kerr if (id->engine_type != fsi_dev->engine_type) 966dd37eed7SJeremy Kerr continue; 967dd37eed7SJeremy Kerr if (id->version == FSI_VERSION_ANY || 968dd37eed7SJeremy Kerr id->version == fsi_dev->version) 969dd37eed7SJeremy Kerr return 1; 970dd37eed7SJeremy Kerr } 971dd37eed7SJeremy Kerr 972dd37eed7SJeremy Kerr return 0; 973dd37eed7SJeremy Kerr } 974dd37eed7SJeremy Kerr 975356d8009SChristopher Bostic int fsi_driver_register(struct fsi_driver *fsi_drv) 976356d8009SChristopher Bostic { 977356d8009SChristopher Bostic if (!fsi_drv) 978356d8009SChristopher Bostic return -EINVAL; 979356d8009SChristopher Bostic if (!fsi_drv->id_table) 980356d8009SChristopher Bostic return -EINVAL; 981356d8009SChristopher Bostic 982356d8009SChristopher Bostic return driver_register(&fsi_drv->drv); 983356d8009SChristopher Bostic } 984356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_register); 985356d8009SChristopher Bostic 986356d8009SChristopher Bostic void fsi_driver_unregister(struct fsi_driver *fsi_drv) 987356d8009SChristopher Bostic { 988356d8009SChristopher Bostic driver_unregister(&fsi_drv->drv); 989356d8009SChristopher Bostic } 990356d8009SChristopher Bostic EXPORT_SYMBOL_GPL(fsi_driver_unregister); 991356d8009SChristopher Bostic 9920508ad1fSJeremy Kerr struct bus_type fsi_bus_type = { 9930508ad1fSJeremy Kerr .name = "fsi", 994dd37eed7SJeremy Kerr .match = fsi_bus_match, 9950508ad1fSJeremy Kerr }; 9960508ad1fSJeremy Kerr EXPORT_SYMBOL_GPL(fsi_bus_type); 9970508ad1fSJeremy Kerr 998496f8931SJoel Stanley static int __init fsi_init(void) 9990508ad1fSJeremy Kerr { 10000508ad1fSJeremy Kerr return bus_register(&fsi_bus_type); 10010508ad1fSJeremy Kerr } 1002496f8931SJoel Stanley postcore_initcall(fsi_init); 10030508ad1fSJeremy Kerr 10040508ad1fSJeremy Kerr static void fsi_exit(void) 10050508ad1fSJeremy Kerr { 10060508ad1fSJeremy Kerr bus_unregister(&fsi_bus_type); 10070508ad1fSJeremy Kerr } 10080508ad1fSJeremy Kerr module_exit(fsi_exit); 10091fa847d7SJeremy Kerr module_param(discard_errors, int, 0664); 1010acb7e8f7SChristopher Bostic MODULE_LICENSE("GPL"); 10111fa847d7SJeremy Kerr MODULE_PARM_DESC(discard_errors, "Don't invoke error handling on bus accesses"); 1012