| 1 | /* |
| 2 | * Copyright (c) 1998, 2001 Nicolas Souchu |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | * |
| 26 | * $FreeBSD: src/sys/dev/bktr/bktr_i2c.c,v 1.25 2003/12/08 07:59:18 obrien Exp $ |
| 27 | * $DragonFly: src/sys/dev/video/bktr/bktr_i2c.c,v 1.8 2006/10/25 20:56:02 dillon Exp $ |
| 28 | */ |
| 29 | |
| 30 | /* |
| 31 | * I2C support for the bti2c chipset. |
| 32 | * |
| 33 | * From brooktree848.c <fsmp@freefall.org> |
| 34 | */ |
| 35 | |
| 36 | #include "opt_bktr.h" |
| 37 | |
| 38 | #include <sys/param.h> |
| 39 | #include <sys/kernel.h> |
| 40 | #include <sys/malloc.h> |
| 41 | #include <sys/systm.h> |
| 42 | #include <sys/module.h> |
| 43 | #include <sys/bus.h> |
| 44 | #include <sys/uio.h> |
| 45 | #include <sys/selinfo.h> |
| 46 | |
| 47 | #include <bus/pci/pcivar.h> |
| 48 | #include <bus/pci/pcireg.h> |
| 49 | |
| 50 | #include <dev/video/meteor/ioctl_meteor.h> |
| 51 | #include <dev/video/bktr/ioctl_bt848.h> /* extensions to ioctl_meteor.h */ |
| 52 | #include <dev/video/bktr/bktr_reg.h> |
| 53 | #include <dev/video/bktr/bktr_i2c.h> |
| 54 | |
| 55 | #include <bus/smbus/smbconf.h> |
| 56 | #include <bus/iicbus/iiconf.h> |
| 57 | |
| 58 | #define I2C_DELAY 40 |
| 59 | |
| 60 | /* Compilation is void if BKTR_USE_FREEBSD_SMBUS is not |
| 61 | * defined. This allows bktr owners to have smbus active for there |
| 62 | * motherboard and still use their bktr without smbus. |
| 63 | */ |
| 64 | #if defined(BKTR_USE_FREEBSD_SMBUS) |
| 65 | |
| 66 | #define BTI2C_DEBUG(x) if (bti2c_debug) (x) |
| 67 | static int bti2c_debug = 0; |
| 68 | |
| 69 | /* |
| 70 | * Call this to pass the address of the bktr device to the |
| 71 | * bti2c_i2c layer and initialize all the I2C bus architecture |
| 72 | */ |
| 73 | int bt848_i2c_attach(device_t dev) |
| 74 | { |
| 75 | struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev); |
| 76 | struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc; |
| 77 | |
| 78 | sc->smbus = device_add_child(dev, "smbus", -1); |
| 79 | sc->iicbb = device_add_child(dev, "iicbb", -1); |
| 80 | |
| 81 | if (!sc->iicbb || !sc->smbus) |
| 82 | return ENXIO; |
| 83 | |
| 84 | bus_generic_attach(dev); |
| 85 | |
| 86 | return (0); |
| 87 | }; |
| 88 | |
| 89 | int bt848_i2c_detach(device_t dev) |
| 90 | { |
| 91 | struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev); |
| 92 | struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc; |
| 93 | int error = 0; |
| 94 | |
| 95 | if ((error = bus_generic_detach(dev))) |
| 96 | goto error; |
| 97 | |
| 98 | if (sc->iicbb && (error = device_delete_child(dev, sc->iicbb))) |
| 99 | goto error; |
| 100 | |
| 101 | if (sc->smbus && (error = device_delete_child(dev, sc->smbus))) |
| 102 | goto error; |
| 103 | |
| 104 | error: |
| 105 | return (error); |
| 106 | } |
| 107 | |
| 108 | int bti2c_smb_callback(device_t dev, int index, caddr_t *data) |
| 109 | { |
| 110 | struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev); |
| 111 | struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc; |
| 112 | int error = 0; |
| 113 | |
| 114 | /* test each time if we already have/haven't the iicbus |
| 115 | * to avoid deadlocks |
| 116 | */ |
| 117 | switch (index) { |
| 118 | case SMB_REQUEST_BUS: |
| 119 | /* XXX test & set */ |
| 120 | if (!sc->bus_owned) { |
| 121 | sc->bus_owned = 1; |
| 122 | } else |
| 123 | error = EWOULDBLOCK; |
| 124 | break; |
| 125 | |
| 126 | case SMB_RELEASE_BUS: |
| 127 | /* XXX test & set */ |
| 128 | if (sc->bus_owned) { |
| 129 | sc->bus_owned = 0; |
| 130 | } else |
| 131 | error = EINVAL; |
| 132 | break; |
| 133 | |
| 134 | default: |
| 135 | error = EINVAL; |
| 136 | } |
| 137 | |
| 138 | return (error); |
| 139 | } |
| 140 | |
| 141 | int bti2c_iic_callback(device_t dev, int index, caddr_t *data) |
| 142 | { |
| 143 | struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev); |
| 144 | struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc; |
| 145 | int error = 0; |
| 146 | |
| 147 | /* test each time if we already have/haven't the smbus |
| 148 | * to avoid deadlocks |
| 149 | */ |
| 150 | switch (index) { |
| 151 | case IIC_REQUEST_BUS: |
| 152 | /* XXX test & set */ |
| 153 | if (!sc->bus_owned) { |
| 154 | sc->bus_owned = 1; |
| 155 | } else |
| 156 | error = EWOULDBLOCK; |
| 157 | break; |
| 158 | |
| 159 | case IIC_RELEASE_BUS: |
| 160 | /* XXX test & set */ |
| 161 | if (sc->bus_owned) { |
| 162 | sc->bus_owned = 0; |
| 163 | } else |
| 164 | error = EINVAL; |
| 165 | break; |
| 166 | |
| 167 | default: |
| 168 | error = EINVAL; |
| 169 | } |
| 170 | |
| 171 | return (error); |
| 172 | } |
| 173 | |
| 174 | int bti2c_iic_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr) |
| 175 | { |
| 176 | if (oldaddr) |
| 177 | *oldaddr = 0; /* XXX */ |
| 178 | |
| 179 | return (IIC_ENOADDR); |
| 180 | } |
| 181 | |
| 182 | void bti2c_iic_setsda(device_t dev, int val) |
| 183 | { |
| 184 | struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev); |
| 185 | int clock; |
| 186 | |
| 187 | clock = INL(sc, BKTR_I2C_DATA_CTL) & 0x2; |
| 188 | |
| 189 | if (val) |
| 190 | OUTL(sc, BKTR_I2C_DATA_CTL, clock | 1); |
| 191 | else |
| 192 | OUTL(sc, BKTR_I2C_DATA_CTL, clock); |
| 193 | |
| 194 | DELAY(I2C_DELAY); |
| 195 | |
| 196 | return; |
| 197 | } |
| 198 | |
| 199 | void bti2c_iic_setscl(device_t dev, int val) |
| 200 | { |
| 201 | struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev); |
| 202 | int data; |
| 203 | |
| 204 | data = INL(sc, BKTR_I2C_DATA_CTL) & 0x1; |
| 205 | |
| 206 | if (val) |
| 207 | OUTL(sc, BKTR_I2C_DATA_CTL, 0x2 | data); |
| 208 | else |
| 209 | OUTL(sc, BKTR_I2C_DATA_CTL, data); |
| 210 | |
| 211 | DELAY(I2C_DELAY); |
| 212 | |
| 213 | return; |
| 214 | } |
| 215 | |
| 216 | int |
| 217 | bti2c_iic_getsda(device_t dev) |
| 218 | { |
| 219 | struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev); |
| 220 | |
| 221 | return (INL(sc,BKTR_I2C_DATA_CTL) & 0x1); |
| 222 | } |
| 223 | |
| 224 | int |
| 225 | bti2c_iic_getscl(device_t dev) |
| 226 | { |
| 227 | return (0); |
| 228 | } |
| 229 | |
| 230 | static int |
| 231 | bti2c_write(struct bktr_softc *sc, u_long data) |
| 232 | { |
| 233 | u_long x; |
| 234 | |
| 235 | /* clear status bits */ |
| 236 | OUTL(sc, BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE)); |
| 237 | |
| 238 | BTI2C_DEBUG(printf("w%lx", data)); |
| 239 | |
| 240 | /* write the address and data */ |
| 241 | OUTL(sc, BKTR_I2C_DATA_CTL, data); |
| 242 | |
| 243 | /* wait for completion */ |
| 244 | for ( x = 0x7fffffff; x; --x ) { /* safety valve */ |
| 245 | if ( INL(sc, BKTR_INT_STAT) & BT848_INT_I2CDONE ) |
| 246 | break; |
| 247 | } |
| 248 | |
| 249 | /* check for ACK */ |
| 250 | if ( !x || !( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK) ) { |
| 251 | BTI2C_DEBUG(printf("%c%c", (!x)?'+':'-', |
| 252 | (!( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-')); |
| 253 | return (SMB_ENOACK); |
| 254 | } |
| 255 | BTI2C_DEBUG(printf("+")); |
| 256 | |
| 257 | /* return OK */ |
| 258 | return( 0 ); |
| 259 | } |
| 260 | |
| 261 | int |
| 262 | bti2c_smb_writeb(device_t dev, u_char slave, char cmd, char byte) |
| 263 | { |
| 264 | struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev); |
| 265 | u_long data; |
| 266 | |
| 267 | data = ((slave & 0xff) << 24) | ((byte & 0xff) << 16) | (u_char)cmd; |
| 268 | |
| 269 | return (bti2c_write(sc, data)); |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * byte1 becomes low byte of word |
| 274 | * byte2 becomes high byte of word |
| 275 | */ |
| 276 | int |
| 277 | bti2c_smb_writew(device_t dev, u_char slave, char cmd, short word) |
| 278 | { |
| 279 | struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev); |
| 280 | u_long data; |
| 281 | char low, high; |
| 282 | |
| 283 | low = (char)(word & 0xff); |
| 284 | high = (char)((word & 0xff00) >> 8); |
| 285 | |
| 286 | data = ((slave & 0xff) << 24) | ((low & 0xff) << 16) | |
| 287 | ((high & 0xff) << 8) | BT848_DATA_CTL_I2CW3B | (u_char)cmd; |
| 288 | |
| 289 | return (bti2c_write(sc, data)); |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * The Bt878 and Bt879 differed on the treatment of i2c commands |
| 294 | */ |
| 295 | int |
| 296 | bti2c_smb_readb(device_t dev, u_char slave, char cmd, char *byte) |
| 297 | { |
| 298 | struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev); |
| 299 | u_long x; |
| 300 | |
| 301 | /* clear status bits */ |
| 302 | OUTL(sc,BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE)); |
| 303 | |
| 304 | OUTL(sc,BKTR_I2C_DATA_CTL, ((slave & 0xff) << 24) | (u_char)cmd); |
| 305 | |
| 306 | BTI2C_DEBUG(printf("r%lx/", (u_long)(((slave & 0xff) << 24) | (u_char)cmd))); |
| 307 | |
| 308 | /* wait for completion */ |
| 309 | for ( x = 0x7fffffff; x; --x ) { /* safety valve */ |
| 310 | if ( INL(sc,BKTR_INT_STAT) & BT848_INT_I2CDONE ) |
| 311 | break; |
| 312 | } |
| 313 | |
| 314 | /* check for ACK */ |
| 315 | if ( !x || !(INL(sc,BKTR_INT_STAT) & BT848_INT_RACK) ) { |
| 316 | BTI2C_DEBUG(printf("r%c%c", (!x)?'+':'-', |
| 317 | (!( INL(sc,BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-')); |
| 318 | return (SMB_ENOACK); |
| 319 | } |
| 320 | |
| 321 | *byte = (char)((INL(sc,BKTR_I2C_DATA_CTL) >> 8) & 0xff); |
| 322 | BTI2C_DEBUG(printf("r%x+", *byte)); |
| 323 | |
| 324 | return (0); |
| 325 | } |
| 326 | |
| 327 | #endif /* defined(BKTR_USE_FREEBSD_SMBUS) */ |