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  * $FreeBSD: src/sys/dev/bktr/bktr_i2c.c,v 1.29 2006/12/31 19:42:47 jmg Exp $
   27  * $DragonFly: src/sys/dev/video/bktr/bktr_i2c.c,v 1.10 2007/10/03 19:27:08 swildner 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/event.h>
   44 #include <sys/bus.h>
   45 #include <sys/uio.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(kprintf("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(kprintf("%c%c", (!x)?'+':'-',
  252                         (!( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
  253                 return (SMB_ENOACK);
  254         }
  255         BTI2C_DEBUG(kprintf("+"));
  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(kprintf("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(kprintf("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(kprintf("r%x+", *byte));
  323 
  324         return (0);
  325 }
  326 
  327 #endif /* defined(BKTR_USE_FREEBSD_SMBUS) */
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FreeBSD/Linux Kernel Cross Reference sys/dev/video/bktr/bktr_i2c.c

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sys/dev/video/bktr/bktr_i2c.c
