bktr_i2c.c

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    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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/9.0/sys/dev/bktr/bktr_i2c.c 201758 2010-01-07 21:01:37Z mbr $");
   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 
   46 #if __FreeBSD_version < 500014
   47 #include <sys/select.h>
   48 #else
   49 #include <sys/selinfo.h>
   50 #endif
   51 
   52 #if (__FreeBSD_version < 500000)
   53 #include <pci/pcivar.h>
   54 #include <pci/pcireg.h>
   55 #else
   56 #include <dev/pci/pcivar.h>
   57 #include <dev/pci/pcireg.h>
   58 #endif
   59 
   60 #include <machine/bus.h>
   61 #include <sys/bus.h>
   62 
   63 #include <dev/bktr/ioctl_meteor.h>
   64 #include <dev/bktr/ioctl_bt848.h>       /* extensions to ioctl_meteor.h */
   65 #include <dev/bktr/bktr_reg.h>
   66 #include <dev/bktr/bktr_i2c.h>
   67 
   68 #include <dev/smbus/smbconf.h>
   69 #include <dev/iicbus/iiconf.h>
   70 
   71 /* Compilation is void if BKTR_USE_FREEBSD_SMBUS is not
   72  * defined. This allows bktr owners to have smbus active for there
   73  * motherboard and still use their bktr without smbus.
   74  */
   75 #if defined(BKTR_USE_FREEBSD_SMBUS)
   76 
   77 #define BTI2C_DEBUG(x)  if (bti2c_debug) (x)
   78 static int bti2c_debug = 0;
   79 
   80 /*
   81  * Call this to pass the address of the bktr device to the
   82  * bti2c_i2c layer and initialize all the I2C bus architecture
   83  */
   84 int bt848_i2c_attach(device_t dev)
   85 {
   86         struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
   87         struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
   88 
   89         sc->smbus = device_add_child(dev, "smbus", -1);
   90         sc->iicbb = device_add_child(dev, "iicbb", -1);
   91 
   92         if (!sc->iicbb || !sc->smbus)
   93                 return ENXIO;
   94 
   95         bus_generic_attach(dev);
   96 
   97         return (0);
   98 };
   99 
  100 int bt848_i2c_detach(device_t dev)
  101 {
  102         struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
  103         struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
  104         int error = 0;
  105 
  106         if ((error = bus_generic_detach(dev)))
  107                 goto error;
  108 
  109         if (sc->iicbb && (error = device_delete_child(dev, sc->iicbb)))
  110                 goto error;
  111 
  112         if (sc->smbus && (error = device_delete_child(dev, sc->smbus)))
  113                 goto error;
  114 
  115 error:
  116         return (error);
  117 }
  118 
  119 int bti2c_smb_callback(device_t dev, int index, void *data)
  120 {
  121         struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
  122         struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
  123         int error = 0;
  124 
  125         /* test each time if we already have/haven't the iicbus
  126          * to avoid deadlocks
  127          */
  128         switch (index) {
  129         case SMB_REQUEST_BUS:
  130                 /* XXX test & set */
  131                 mtx_lock(&Giant);
  132                 if (!sc->bus_owned) {
  133                         sc->bus_owned = 1;
  134                 } else
  135                         error = EWOULDBLOCK;
  136                 mtx_unlock(&Giant);
  137                 break;
  138 
  139         case SMB_RELEASE_BUS:
  140                 /* XXX test & set */
  141                 mtx_lock(&Giant);
  142                 if (sc->bus_owned) {
  143                         sc->bus_owned = 0;
  144                 } else
  145                         error = EINVAL;
  146                 mtx_unlock(&Giant);
  147                 break;
  148 
  149         default:
  150                 error = EINVAL;
  151         }
  152 
  153         return (error);
  154 }
  155 
  156 int bti2c_iic_callback(device_t dev, int index, caddr_t *data)
  157 {
  158         struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
  159         struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
  160         int error = 0;
  161 
  162         /* test each time if we already have/haven't the smbus
  163          * to avoid deadlocks
  164          */
  165         switch (index) {
  166         case IIC_REQUEST_BUS:
  167                 /* XXX test & set */
  168                 mtx_lock(&Giant);
  169                 if (!sc->bus_owned) {
  170                         sc->bus_owned = 1;
  171                 } else
  172                         error = EWOULDBLOCK;
  173                 mtx_unlock(&Giant);
  174                 break;
  175 
  176         case IIC_RELEASE_BUS:
  177                 /* XXX test & set */
  178                 mtx_lock(&Giant);
  179                 if (sc->bus_owned) {
  180                         sc->bus_owned = 0;
  181                 } else
  182                         error = EINVAL;
  183                 mtx_unlock(&Giant);
  184                 break;
  185 
  186         default:
  187                 error = EINVAL;
  188         }
  189 
  190         return (error);
  191 }
  192 
  193 int bti2c_iic_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
  194 {
  195         mtx_lock(&Giant);
  196         if (oldaddr)
  197                 *oldaddr = 0;                   /* XXX */
  198         mtx_unlock(&Giant);
  199 
  200         return (IIC_ENOADDR);
  201 }
  202 
  203 void bti2c_iic_setsda(device_t dev, int val)
  204 {
  205         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  206         int clock;
  207 
  208         mtx_lock(&Giant);
  209         clock = INL(sc, BKTR_I2C_DATA_CTL) & 0x2;
  210 
  211         if (val)
  212                 OUTL(sc, BKTR_I2C_DATA_CTL, clock | 1);
  213         else
  214                 OUTL(sc, BKTR_I2C_DATA_CTL, clock);
  215         mtx_unlock(&Giant);
  216 
  217         return;
  218 }
  219 
  220 void bti2c_iic_setscl(device_t dev, int val)
  221 {
  222         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  223         int data;
  224 
  225         mtx_lock(&Giant);
  226         data = INL(sc, BKTR_I2C_DATA_CTL) & 0x1;
  227 
  228         if (val)
  229                 OUTL(sc, BKTR_I2C_DATA_CTL, 0x2 | data);
  230         else
  231                 OUTL(sc, BKTR_I2C_DATA_CTL, data);
  232         mtx_unlock(&Giant);
  233 
  234         return;
  235 }
  236 
  237 int
  238 bti2c_iic_getsda(device_t dev)
  239 {
  240         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  241         int retval;
  242 
  243         mtx_lock(&Giant);
  244         retval = INL(sc,BKTR_I2C_DATA_CTL) & 0x1;
  245         mtx_unlock(&Giant);
  246         return (retval);
  247 }
  248 
  249 int
  250 bti2c_iic_getscl(device_t dev)
  251 {
  252         return (0);
  253 }
  254 
  255 static int
  256 bti2c_write(struct bktr_softc *sc, u_long data)
  257 {
  258         u_long          x;
  259 
  260         mtx_lock(&Giant);
  261 
  262         /* clear status bits */
  263         OUTL(sc, BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
  264 
  265         BTI2C_DEBUG(printf("w%lx", data));
  266 
  267         /* write the address and data */
  268         OUTL(sc, BKTR_I2C_DATA_CTL, data);
  269 
  270         /* wait for completion */
  271         for ( x = 0x7fffffff; x; --x ) {        /* safety valve */
  272                 if ( INL(sc, BKTR_INT_STAT) & BT848_INT_I2CDONE )
  273                         break;
  274         }
  275 
  276         /* check for ACK */
  277         if ( !x || !( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK) ) {
  278                 BTI2C_DEBUG(printf("%c%c", (!x)?'+':'-',
  279                         (!( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
  280                 mtx_unlock(&Giant);
  281                 return (SMB_ENOACK);
  282         }
  283         BTI2C_DEBUG(printf("+"));
  284         mtx_unlock(&Giant);
  285 
  286         /* return OK */
  287         return( 0 );
  288 }
  289 
  290 int
  291 bti2c_smb_writeb(device_t dev, u_char slave, char cmd, char byte)
  292 {
  293         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  294         u_long data;
  295 
  296         data = ((slave & 0xff) << 24) | ((byte & 0xff) << 16) | (u_char)cmd;
  297 
  298         return (bti2c_write(sc, data));
  299 }
  300 
  301 /*
  302  * byte1 becomes low byte of word
  303  * byte2 becomes high byte of word
  304  */
  305 int
  306 bti2c_smb_writew(device_t dev, u_char slave, char cmd, short word)
  307 {
  308         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  309         u_long data;
  310         char low, high;
  311 
  312         low = (char)(word & 0xff);
  313         high = (char)((word & 0xff00) >> 8);
  314 
  315         data = ((slave & 0xff) << 24) | ((low & 0xff) << 16) |
  316                 ((high & 0xff) << 8) | BT848_DATA_CTL_I2CW3B | (u_char)cmd;
  317 
  318         return (bti2c_write(sc, data));
  319 }
  320 
  321 /*
  322  * The Bt878 and Bt879 differed on the treatment of i2c commands
  323  */
  324 int
  325 bti2c_smb_readb(device_t dev, u_char slave, char cmd, char *byte)
  326 {
  327         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  328         u_long          x;
  329 
  330         mtx_lock(&Giant);
  331         /* clear status bits */
  332         OUTL(sc,BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
  333 
  334         OUTL(sc,BKTR_I2C_DATA_CTL, ((slave & 0xff) << 24) | (u_char)cmd);
  335 
  336         BTI2C_DEBUG(printf("r%lx/", (u_long)(((slave & 0xff) << 24) | (u_char)cmd)));
  337 
  338         /* wait for completion */
  339         for ( x = 0x7fffffff; x; --x ) {        /* safety valve */
  340                 if ( INL(sc,BKTR_INT_STAT) & BT848_INT_I2CDONE )
  341                         break;
  342         }
  343 
  344         /* check for ACK */
  345         if ( !x || !(INL(sc,BKTR_INT_STAT) & BT848_INT_RACK) ) {
  346                 BTI2C_DEBUG(printf("r%c%c", (!x)?'+':'-',
  347                         (!( INL(sc,BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
  348                 mtx_unlock(&Giant);
  349                 return (SMB_ENOACK);
  350         }
  351 
  352         *byte = (char)((INL(sc,BKTR_I2C_DATA_CTL) >> 8) & 0xff);
  353         BTI2C_DEBUG(printf("r%x+", *byte));
  354         mtx_unlock(&Giant);
  355 
  356         return (0);
  357 }
  358 
  359 DRIVER_MODULE(iicbb, bktr, iicbb_driver, iicbb_devclass, 0, 0);
  360 DRIVER_MODULE(smbus, bktr, smbus_driver, smbus_devclass, 0, 0);
  361 
  362 #endif /* defined(BKTR_USE_FREEBSD_SMBUS) */
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FreeBSD/Linux Kernel Cross Reference sys/dev/bktr/bktr_i2c.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/bktr/bktr_i2c.c
