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("$FreeBSD$");
   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                 if (!sc->bus_owned) {
  132                         sc->bus_owned = 1;
  133                 } else
  134                         error = EWOULDBLOCK;
  135                 break;
  136 
  137         case SMB_RELEASE_BUS:
  138                 /* XXX test & set */
  139                 if (sc->bus_owned) {
  140                         sc->bus_owned = 0;
  141                 } else
  142                         error = EINVAL;
  143                 break;
  144 
  145         default:
  146                 error = EINVAL;
  147         }
  148 
  149         return (error);
  150 }
  151 
  152 int bti2c_iic_callback(device_t dev, int index, caddr_t *data)
  153 {
  154         struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
  155         struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
  156         int error = 0;
  157 
  158         /* test each time if we already have/haven't the smbus
  159          * to avoid deadlocks
  160          */
  161         switch (index) {
  162         case IIC_REQUEST_BUS:
  163                 /* XXX test & set */
  164                 if (!sc->bus_owned) {
  165                         sc->bus_owned = 1;
  166                 } else
  167                         error = EWOULDBLOCK;
  168                 break;
  169 
  170         case IIC_RELEASE_BUS:
  171                 /* XXX test & set */
  172                 if (sc->bus_owned) {
  173                         sc->bus_owned = 0;
  174                 } else
  175                         error = EINVAL;
  176                 break;
  177 
  178         default:
  179                 error = EINVAL;
  180         }
  181 
  182         return (error);
  183 }
  184 
  185 int bti2c_iic_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
  186 {
  187         if (oldaddr)
  188                 *oldaddr = 0;                   /* XXX */
  189 
  190         return (IIC_ENOADDR);
  191 }
  192 
  193 void bti2c_iic_setsda(device_t dev, int val)
  194 {
  195         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  196         int clock;
  197 
  198         clock = INL(sc, BKTR_I2C_DATA_CTL) & 0x2;
  199 
  200         if (val)
  201                 OUTL(sc, BKTR_I2C_DATA_CTL, clock | 1);
  202         else
  203                 OUTL(sc, BKTR_I2C_DATA_CTL, clock);
  204 
  205         return;
  206 }
  207 
  208 void bti2c_iic_setscl(device_t dev, int val)
  209 {
  210         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  211         int data;
  212 
  213         data = INL(sc, BKTR_I2C_DATA_CTL) & 0x1;
  214 
  215         if (val)
  216                 OUTL(sc, BKTR_I2C_DATA_CTL, 0x2 | data);
  217         else
  218                 OUTL(sc, BKTR_I2C_DATA_CTL, data);
  219 
  220         return;
  221 }
  222 
  223 int
  224 bti2c_iic_getsda(device_t dev)
  225 {
  226         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  227 
  228         return (INL(sc,BKTR_I2C_DATA_CTL) & 0x1);
  229 }
  230 
  231 int
  232 bti2c_iic_getscl(device_t dev)
  233 {
  234         return (0);
  235 }
  236 
  237 static int
  238 bti2c_write(struct bktr_softc *sc, u_long data)
  239 {
  240         u_long          x;
  241 
  242         /* clear status bits */
  243         OUTL(sc, BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
  244 
  245         BTI2C_DEBUG(printf("w%lx", data));
  246 
  247         /* write the address and data */
  248         OUTL(sc, BKTR_I2C_DATA_CTL, data);
  249 
  250         /* wait for completion */
  251         for ( x = 0x7fffffff; x; --x ) {        /* safety valve */
  252                 if ( INL(sc, BKTR_INT_STAT) & BT848_INT_I2CDONE )
  253                         break;
  254         }
  255 
  256         /* check for ACK */
  257         if ( !x || !( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK) ) {
  258                 BTI2C_DEBUG(printf("%c%c", (!x)?'+':'-',
  259                         (!( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
  260                 return (SMB_ENOACK);
  261         }
  262         BTI2C_DEBUG(printf("+"));
  263 
  264         /* return OK */
  265         return( 0 );
  266 }
  267 
  268 int
  269 bti2c_smb_writeb(device_t dev, u_char slave, char cmd, char byte)
  270 {
  271         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  272         u_long data;
  273 
  274         data = ((slave & 0xff) << 24) | ((byte & 0xff) << 16) | (u_char)cmd;
  275 
  276         return (bti2c_write(sc, data));
  277 }
  278 
  279 /*
  280  * byte1 becomes low byte of word
  281  * byte2 becomes high byte of word
  282  */
  283 int
  284 bti2c_smb_writew(device_t dev, u_char slave, char cmd, short word)
  285 {
  286         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  287         u_long data;
  288         char low, high;
  289 
  290         low = (char)(word & 0xff);
  291         high = (char)((word & 0xff00) >> 8);
  292 
  293         data = ((slave & 0xff) << 24) | ((low & 0xff) << 16) |
  294                 ((high & 0xff) << 8) | BT848_DATA_CTL_I2CW3B | (u_char)cmd;
  295 
  296         return (bti2c_write(sc, data));
  297 }
  298 
  299 /*
  300  * The Bt878 and Bt879 differed on the treatment of i2c commands
  301  */
  302 int
  303 bti2c_smb_readb(device_t dev, u_char slave, char cmd, char *byte)
  304 {
  305         struct bktr_softc *sc  = (struct bktr_softc *)device_get_softc(dev);
  306         u_long          x;
  307 
  308         /* clear status bits */
  309         OUTL(sc,BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
  310 
  311         OUTL(sc,BKTR_I2C_DATA_CTL, ((slave & 0xff) << 24) | (u_char)cmd);;
  312 
  313         BTI2C_DEBUG(printf("r%lx/", (u_long)(((slave & 0xff) << 24) | (u_char)cmd)));
  314 
  315         /* wait for completion */
  316         for ( x = 0x7fffffff; x; --x ) {        /* safety valve */
  317                 if ( INL(sc,BKTR_INT_STAT) & BT848_INT_I2CDONE )
  318                         break;
  319         }
  320 
  321         /* check for ACK */
  322         if ( !x || !(INL(sc,BKTR_INT_STAT) & BT848_INT_RACK) ) {
  323                 BTI2C_DEBUG(printf("r%c%c", (!x)?'+':'-',
  324                         (!( INL(sc,BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
  325                 return (SMB_ENOACK);
  326         }
  327 
  328         *byte = (char)((INL(sc,BKTR_I2C_DATA_CTL) >> 8) & 0xff);
  329         BTI2C_DEBUG(printf("r%x+", *byte));
  330 
  331         return (0);
  332 }
  333 
  334 DRIVER_MODULE(smbus, bktr, smbus_driver, smbus_devclass, 0, 0);
  335 
  336 #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
