1/* $NetBSD: alipm.c,v 1.7 2010/03/11 04:00:36 mrg Exp $ */ 2/* $OpenBSD: alipm.c,v 1.13 2007/05/03 12:19:01 dlg Exp $ */ 3 4/* 5 * Copyright (c) 2005 Mark Kettenis 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#include <sys/cdefs.h> 21__KERNEL_RCSID(0, "$NetBSD: alipm.c,v 1.7 2010/03/11 04:00:36 mrg Exp $"); 22 23#include <sys/param.h> 24#include <sys/device.h> 25#include <sys/kernel.h> 26#include <sys/rwlock.h> 27#include <sys/proc.h> 28#include <sys/systm.h> 29 30#include <dev/i2c/i2cvar.h> 31 32#include <dev/pci/pcidevs.h> 33#include <dev/pci/pcireg.h> 34#include <dev/pci/pcivar.h> 35 36/* 37 * Acer Labs M7101 Power register definitions. 38 */ 39 40/* PCI configuration registers. */ 41#define ALIPM_CONF 0xd0 /* general configuration */ 42#define ALIPM_CONF_SMBEN 0x0400 /* enable SMBus */ 43#define ALIPM_BASE 0xe0 /* ACPI and SMBus base address */ 44#define ALIPM_SMB_HOSTC 0xf0 /* host configuration */ 45#define ALIPM_SMB_HOSTC_HSTEN 0x00000001 /* enable host controller */ 46#define ALIPM_SMB_HOSTC_CLOCK 0x00e00000 /* clock speed */ 47#define ALIPM_SMB_HOSTC_149K 0x00000000 /* 149 KHz clock */ 48#define ALIPM_SMB_HOSTC_74K 0x00200000 /* 74 KHz clock */ 49#define ALIPM_SMB_HOSTC_37K 0x00400000 /* 37 KHz clock */ 50#define ALIPM_SMB_HOSTC_223K 0x00800000 /* 223 KHz clock */ 51#define ALIPM_SMB_HOSTC_111K 0x00a00000 /* 111 KHz clock */ 52#define ALIPM_SMB_HOSTC_55K 0x00c00000 /* 55 KHz clock */ 53 54#define ALIPM_SMB_SIZE 32 /* SMBus I/O space size */ 55 56/* SMBus I/O registers */ 57#define ALIPM_SMB_HS 0x00 /* host status */ 58#define ALIPM_SMB_HS_IDLE 0x04 59#define ALIPM_SMB_HS_BUSY 0x08 /* running a command */ 60#define ALIPM_SMB_HS_DONE 0x10 /* command completed */ 61#define ALIPM_SMB_HS_DEVERR 0x20 /* command error */ 62#define ALIPM_SMB_HS_BUSERR 0x40 /* transaction collision */ 63#define ALIPM_SMB_HS_FAILED 0x80 /* failed bus transaction */ 64#define ALIPM_SMB_HS_BITS \ 65 "\020\003IDLE\004BUSY\005DONE\006DEVERR\007BUSERR\010FAILED" 66#define ALIPM_SMB_HC 0x01 /* host control */ 67#define ALIPM_SMB_HC_KILL 0x04 /* kill command */ 68#define ALIPM_SMB_HC_RESET 0x08 /* reset bus */ 69#define ALIPM_SMB_HC_CMD_QUICK 0x00 /* QUICK command */ 70#define ALIPM_SMB_HC_CMD_BYTE 0x10 /* BYTE command */ 71#define ALIPM_SMB_HC_CMD_BDATA 0x20 /* BYTE DATA command */ 72#define ALIPM_SMB_HC_CMD_WDATA 0x30 /* WORD DATA command */ 73#define ALIPM_SMB_HC_CMD_BLOCK 0x40 /* BLOCK command */ 74#define ALIPM_SMB_START 0x02 /* start command */ 75#define ALIPM_SMB_TXSLVA 0x03 /* transmit slave address */ 76#define ALIPM_SMB_TXSLVA_READ (1 << 0) /* read direction */ 77#define ALIPM_SMB_TXSLVA_ADDR(x) (((x) & 0x7f) << 1) /* 7-bit address */ 78#define ALIPM_SMB_HD0 0x04 /* host data 0 */ 79#define ALIPM_SMB_HD1 0x05 /* host data 1 */ 80#define ALIPM_SMB_HBDB 0x06 /* host block data byte */ 81#define ALIPM_SMB_HCMD 0x07 /* host command */ 82 83/* 84 * Newer chips have a more standard, but different PCI configuration 85 * register layout. 86 */ 87 88#define ALIPM_SMB_BASE 0x14 /* SMBus base address */ 89#define ALIPM_SMB_HOSTX 0xe0 /* host configuration */ 90 91#ifdef ALIPM_DEBUG 92#define DPRINTF(x) printf x 93#else 94#define DPRINTF(x) 95#endif 96 97#define ALIPM_DELAY 100 98#define ALIPM_TIMEOUT 1 99 100struct alipm_softc { 101 struct device sc_dev; 102 103 bus_space_tag_t sc_iot; 104 bus_space_handle_t sc_ioh; 105 106 struct i2c_controller sc_smb_tag; 107 krwlock_t sc_smb_lock; 108}; 109 110static int alipm_match(device_t, cfdata_t, void *); 111static void alipm_attach(device_t, device_t, void *); 112 113int alipm_smb_acquire_bus(void *, int); 114void alipm_smb_release_bus(void *, int); 115int alipm_smb_exec(void *, i2c_op_t, i2c_addr_t, const void *, 116 size_t, void *, size_t, int); 117 118CFATTACH_DECL(alipm, sizeof(struct alipm_softc), 119 alipm_match, alipm_attach, NULL, NULL); 120 121static int 122alipm_match(device_t parent, cfdata_t match, void *aux) 123{ 124 struct pci_attach_args *pa = aux; 125 126 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_ALI && 127 (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_ALI_M7101)) 128 return (1); 129 return (0); 130} 131 132static void 133alipm_attach(device_t parent, device_t self, void *aux) 134{ 135 struct alipm_softc *sc = device_private(self); 136 struct pci_attach_args *pa = aux; 137 struct i2cbus_attach_args iba; 138 pcireg_t iobase, reg; 139 bus_size_t iosize = ALIPM_SMB_SIZE; 140 141 /* Old chips don't have the PCI 2.2 Capabilities List. */ 142 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG); 143 if ((reg & PCI_STATUS_CAPLIST_SUPPORT) == 0) { 144 /* Map I/O space */ 145 iobase = pci_conf_read(pa->pa_pc, pa->pa_tag, ALIPM_BASE); 146 sc->sc_iot = pa->pa_iot; 147 if (iobase == 0 || 148 bus_space_map(sc->sc_iot, iobase >> 16, 149 iosize, 0, &sc->sc_ioh)) { 150 aprint_error_dev(&sc->sc_dev, "can't map I/O space\n"); 151 return; 152 } 153 154 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, ALIPM_CONF); 155 if ((reg & ALIPM_CONF_SMBEN) == 0) { 156 aprint_error_dev(&sc->sc_dev, "SMBus disabled\n"); 157 goto fail; 158 } 159 160 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, ALIPM_SMB_HOSTC); 161 if ((reg & ALIPM_SMB_HOSTC_HSTEN) == 0) { 162 aprint_error_dev(&sc->sc_dev, "SMBus host disabled\n"); 163 goto fail; 164 } 165 } else { 166 /* Map I/O space */ 167 if (pci_mapreg_map(pa, ALIPM_SMB_BASE, PCI_MAPREG_TYPE_IO, 0, 168 &sc->sc_iot, &sc->sc_ioh, NULL, &iosize)) { 169 aprint_error_dev(&sc->sc_dev, "can't map I/O space\n"); 170 return; 171 } 172 173 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, ALIPM_SMB_HOSTX); 174 if ((reg & ALIPM_SMB_HOSTC_HSTEN) == 0) { 175 aprint_error_dev(&sc->sc_dev, "SMBus host disabled\n"); 176 goto fail; 177 } 178 } 179 180 switch (reg & ALIPM_SMB_HOSTC_CLOCK) { 181 case ALIPM_SMB_HOSTC_149K: 182 aprint_normal(": 149KHz clock\n"); 183 break; 184 case ALIPM_SMB_HOSTC_74K: 185 aprint_normal(": 74KHz clock\n"); 186 break; 187 case ALIPM_SMB_HOSTC_37K: 188 aprint_normal(": 37KHz clock\n"); 189 break; 190 case ALIPM_SMB_HOSTC_223K: 191 aprint_normal(": 223KHz clock\n"); 192 break; 193 case ALIPM_SMB_HOSTC_111K: 194 aprint_normal(": 111KHz clock\n"); 195 break; 196 case ALIPM_SMB_HOSTC_55K: 197 aprint_normal(": 55KHz clock\n"); 198 break; 199 default: 200 aprint_normal(" unknown clock speed\n"); 201 break; 202 } 203 aprint_naive("\n"); 204 205 /* Attach I2C bus */ 206 rw_init(&sc->sc_smb_lock); 207 sc->sc_smb_tag.ic_cookie = sc; 208 sc->sc_smb_tag.ic_acquire_bus = alipm_smb_acquire_bus; 209 sc->sc_smb_tag.ic_release_bus = alipm_smb_release_bus; 210 sc->sc_smb_tag.ic_exec = alipm_smb_exec; 211 212 memset(&iba, 0, sizeof iba); 213 iba.iba_tag = &sc->sc_smb_tag; 214 (void)config_found_ia(&sc->sc_dev, "i2cbus", &iba, iicbus_print); 215 216 return; 217 218fail: 219 bus_space_unmap(sc->sc_iot, sc->sc_ioh, iosize); 220} 221 222int 223alipm_smb_acquire_bus(void *cookie, int flags) 224{ 225 struct alipm_softc *sc = cookie; 226 227 if (flags & I2C_F_POLL) 228 return (0); 229 230 rw_enter(&sc->sc_smb_lock, RW_WRITER); 231 return 0; 232} 233 234void 235alipm_smb_release_bus(void *cookie, int flags) 236{ 237 struct alipm_softc *sc = cookie; 238 239 if (flags & I2C_F_POLL) 240 return; 241 242 rw_exit(&sc->sc_smb_lock); 243} 244 245int 246alipm_smb_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, 247 const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags) 248{ 249 struct alipm_softc *sc = cookie; 250 u_int8_t *b; 251 u_int8_t ctl, st; 252 int retries, error = 0; 253 254 DPRINTF(("%s: exec op %d, addr 0x%x, cmdlen %d, len %d, " 255 "flags 0x%x\n", device_xname(&sc->sc_dev), op, addr, cmdlen, 256 len, flags)); 257 258 if (!I2C_OP_STOP_P(op) || cmdlen > 1 || len > 2 || 259 (cmdlen == 0 && len > 1)) 260 return (EOPNOTSUPP); 261 262 /* Clear status bits */ 263 bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS, 264 ALIPM_SMB_HS_DONE | ALIPM_SMB_HS_FAILED | 265 ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR); 266 bus_space_barrier(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS, 1, 267 BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE); 268 269 /* Wait until bus is idle */ 270 for (retries = 1000; retries > 0; retries--) { 271 st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS); 272 bus_space_barrier(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS, 1, 273 BUS_SPACE_BARRIER_READ); 274 if (st & (ALIPM_SMB_HS_IDLE | ALIPM_SMB_HS_FAILED | 275 ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR)) 276 break; 277 DELAY(ALIPM_DELAY); 278 } 279 if (retries == 0) { 280 aprint_error_dev(&sc->sc_dev, "timeout st 0x%x\n", st); 281 return (ETIMEDOUT); 282 } 283 if (st & (ALIPM_SMB_HS_FAILED | 284 ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR)) { 285 aprint_error_dev(&sc->sc_dev, "error st 0x%x\n", st); 286 return (EIO); 287 } 288 289 /* Set slave address and transfer direction. */ 290 bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_TXSLVA, 291 ALIPM_SMB_TXSLVA_ADDR(addr) | 292 (I2C_OP_READ_P(op) ? ALIPM_SMB_TXSLVA_READ : 0)); 293 294 if (cmdlen > 0) 295 /* Set command byte */ 296 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 297 ALIPM_SMB_HCMD, ((const u_int8_t *)cmdbuf)[0]); 298 299 if (I2C_OP_WRITE_P(op)) { 300 /* Write data. */ 301 b = buf; 302 if (cmdlen == 0 && len == 1) 303 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 304 ALIPM_SMB_HCMD, b[0]); 305 else if (len > 0) 306 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 307 ALIPM_SMB_HD0, b[0]); 308 if (len > 1) 309 bus_space_write_1(sc->sc_iot, sc->sc_ioh, 310 ALIPM_SMB_HD1, b[1]); 311 } 312 313 /* Set SMBus command */ 314 if (cmdlen == 0) { 315 if (len == 0) 316 ctl = ALIPM_SMB_HC_CMD_QUICK; 317 else 318 ctl = ALIPM_SMB_HC_CMD_BYTE; 319 } else if (len == 1) 320 ctl = ALIPM_SMB_HC_CMD_BDATA; 321 else 322 ctl = ALIPM_SMB_HC_CMD_WDATA; 323 bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HC, ctl); 324 325 /* Start transaction */ 326 bus_space_barrier(sc->sc_iot, sc->sc_ioh, 0, ALIPM_SMB_SIZE, 327 BUS_SPACE_BARRIER_WRITE); 328 bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_START, 0xff); 329 bus_space_barrier(sc->sc_iot, sc->sc_ioh, 0, ALIPM_SMB_SIZE, 330 BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE); 331 332 /* Poll for completion */ 333 DELAY(ALIPM_DELAY); 334 for (retries = 1000; retries > 0; retries--) { 335 st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS); 336 bus_space_barrier(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS, 1, 337 BUS_SPACE_BARRIER_READ); 338 if (st & (ALIPM_SMB_HS_IDLE | ALIPM_SMB_HS_FAILED | 339 ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR)) 340 break; 341 DELAY(ALIPM_DELAY); 342 } 343 if (retries == 0) { 344 aprint_error_dev(&sc->sc_dev, "timeout st 0x%x, resetting\n",st); 345 bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HC, 346 ALIPM_SMB_HC_RESET); 347 bus_space_barrier(sc->sc_iot, sc->sc_ioh, 0, ALIPM_SMB_SIZE, 348 BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE); 349 st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS); 350 bus_space_barrier(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS, 1, 351 BUS_SPACE_BARRIER_READ); 352 error = ETIMEDOUT; 353 goto done; 354 } 355 356 if ((st & ALIPM_SMB_HS_DONE) == 0) { 357 bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HC, 358 ALIPM_SMB_HC_KILL); 359 bus_space_barrier(sc->sc_iot, sc->sc_ioh, 0, ALIPM_SMB_SIZE, 360 BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE); 361 st = bus_space_read_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS); 362 bus_space_barrier(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS, 1, 363 BUS_SPACE_BARRIER_READ); 364 if ((st & ALIPM_SMB_HS_FAILED) == 0) 365 aprint_error_dev(&sc->sc_dev, "error st 0x%x\n", st); 366 } 367 368 /* Check for errors */ 369 if (st & (ALIPM_SMB_HS_FAILED | 370 ALIPM_SMB_HS_BUSERR | ALIPM_SMB_HS_DEVERR)) { 371 error = EIO; 372 goto done; 373 } 374 375 if (I2C_OP_READ_P(op)) { 376 /* Read data */ 377 b = buf; 378 if (len > 0) { 379 b[0] = bus_space_read_1(sc->sc_iot, sc->sc_ioh, 380 ALIPM_SMB_HD0); 381 bus_space_barrier(sc->sc_iot, sc->sc_ioh, 382 ALIPM_SMB_HD0, 1, BUS_SPACE_BARRIER_READ); 383 } 384 if (len > 1) { 385 b[1] = bus_space_read_1(sc->sc_iot, sc->sc_ioh, 386 ALIPM_SMB_HD1); 387 bus_space_barrier(sc->sc_iot, sc->sc_ioh, 388 ALIPM_SMB_HD1, 1, BUS_SPACE_BARRIER_READ); 389 } 390 } 391 392done: 393 /* Clear status bits */ 394 bus_space_write_1(sc->sc_iot, sc->sc_ioh, ALIPM_SMB_HS, st); 395 396 return (error); 397} 398