The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/geode.c

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    1 /*-
    2  * Copyright (c) 2003-2004 Poul-Henning Kamp
    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 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/timetc.h>
   33 #include <sys/bus.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/watchdog.h>
   37 #include <dev/pci/pcireg.h>
   38 #include <dev/pci/pcivar.h>
   39 #include <dev/led/led.h>
   40 #include <machine/pc/bios.h>
   41 
   42 static struct bios_oem bios_soekris = {
   43         { 0xf0000, 0xf1000 },
   44         {
   45                 { "Soekris", 0, 8 },    /* Soekris Engineering. */
   46                 { "net4", 0, 8 },       /* net45xx */
   47                 { "comBIOS", 0, 54 },   /* comBIOS ver. 1.26a  20040819 ... */
   48                 { NULL, 0, 0 },
   49         }
   50 };
   51 
   52 static struct bios_oem bios_soekris_55 = {
   53         { 0xf0000, 0xf1000 },
   54         {
   55                 { "Soekris", 0, 8 },    /* Soekris Engineering. */
   56                 { "net5", 0, 8 },       /* net5xxx */
   57                 { "comBIOS", 0, 54 },   /* comBIOS ver. 1.26a  20040819 ... */
   58                 { NULL, 0, 0 },
   59         }
   60 };
   61 
   62 static struct bios_oem bios_pcengines = {
   63         { 0xf9000, 0xfa000 },
   64         {
   65                 { "PC Engines WRAP", 0, 28 },   /* PC Engines WRAP.1C v1.03 */
   66                 { "tinyBIOS", 0, 28 },          /* tinyBIOS V1.4a (C)1997-2003 */
   67                 { NULL, 0, 0 },
   68         }
   69 };
   70 
   71 static struct bios_oem bios_advantech = {
   72         { 0xfe000, 0xff000 },
   73         {
   74                 { "**** PCM-582", 5, 33 },      /* PCM-5823 BIOS V1.12 ... */
   75                 { "GXm-Cx5530", -11, 35 },      /* 06/07/2002-GXm-Cx5530... */
   76                 { NULL, 0, 0 },
   77         }
   78 };
   79 
   80 static unsigned cba;
   81 static unsigned gpio;
   82 static unsigned geode_counter;
   83 
   84 static struct cdev *led1, *led2, *led3;
   85 static int      led1b, led2b, led3b;
   86 
   87 static void
   88 led_func(void *ptr, int onoff)
   89 {
   90         uint32_t u;
   91         int bit;
   92 
   93         bit = *(int *)ptr;
   94         if (bit < 0) {
   95                 bit = -bit;
   96                 onoff = !onoff;
   97         }
   98 
   99         u = inl(gpio + 4);
  100         if (onoff)
  101                 u |= 1 << bit;
  102         else
  103                 u &= ~(1 << bit);
  104         outl(gpio, u);
  105 }
  106 
  107 static void
  108 cs5536_led_func(void *ptr, int onoff)
  109 {
  110         int bit;
  111         uint16_t a;
  112 
  113         bit = *(int *)ptr;
  114         if (bit < 0) {
  115                 bit = -bit;
  116                 onoff = !onoff;
  117         }
  118 
  119         a = rdmsr(0x5140000c);
  120         if (onoff)
  121                 outl(a, 1 << bit);
  122         else
  123                 outl(a, 1 << (bit + 16));
  124 }
  125 
  126 
  127 static unsigned
  128 geode_get_timecount(struct timecounter *tc)
  129 {
  130         return (inl(geode_counter));
  131 }
  132 
  133 static struct timecounter geode_timecounter = {
  134         geode_get_timecount,
  135         NULL,
  136         0xffffffff,
  137         27000000,
  138         "Geode",
  139         1000
  140 };
  141 
  142 static uint64_t
  143 geode_cputicks(void)
  144 {
  145         unsigned c;
  146         static unsigned last;
  147         static uint64_t offset;
  148 
  149         c = inl(geode_counter);
  150         if (c < last)
  151                 offset += (1LL << 32);
  152         last = c;
  153         return (offset | c);
  154 }
  155 
  156 /*
  157  * The GEODE watchdog runs from a 32kHz frequency.  One period of that is
  158  * 31250 nanoseconds which we round down to 2^14 nanoseconds.  The watchdog
  159  * consists of a power-of-two prescaler and a 16 bit counter, so the math
  160  * is quite simple.  The max timeout is 14 + 16 + 13 = 2^43 nsec ~= 2h26m.
  161  */
  162 static void
  163 geode_watchdog(void *foo __unused, u_int cmd, int *error)
  164 {
  165         u_int u, p, r;
  166 
  167         u = cmd & WD_INTERVAL;
  168         if (u >= 14 && u <= 43) {
  169                 u -= 14;
  170                 if (u > 16) {
  171                         p = u - 16;
  172                         u -= p;
  173                 } else {
  174                         p = 0;
  175                 }
  176                 if (u == 16)
  177                         u = (1 << u) - 1;
  178                 else
  179                         u = 1 << u;
  180                 r = inw(cba + 2) & 0xff00;
  181                 outw(cba + 2, p | 0xf0 | r);
  182                 outw(cba, u);
  183                 *error = 0;
  184         } else {
  185                 outw(cba, 0);
  186         }
  187 }
  188 
  189 /*
  190  * We run MFGPT0 off the 32kHz frequency and prescale by 16384 giving a
  191  * period of half a second.
  192  * Range becomes 2^30 (= 1 sec) to 2^44 (almost 5 hours)
  193  */
  194 static void
  195 cs5536_watchdog(void *foo __unused, u_int cmd, int *error)
  196 {
  197         u_int u, p;
  198         uint16_t a;
  199         uint32_t m;
  200 
  201         a = rdmsr(0x5140000d);
  202         m = rdmsr(0x51400029);
  203         m &= ~(1 << 24);
  204         wrmsr(0x51400029, m);
  205 
  206         u = cmd & WD_INTERVAL;
  207         if (u >= 30 && u <= 44) {
  208                 p = 1 << (u - 29);
  209 
  210                 /* Set up MFGPT0, 32khz, prescaler 16k, C2 event */
  211                 outw(a + 6, 0x030e);
  212                 /* set comparator 2 */
  213                 outw(a + 2, p);
  214                 /* reset counter */
  215                 outw(a + 4, 0);
  216                 /* Arm reset mechanism */
  217                 m |= (1 << 24);
  218                 wrmsr(0x51400029, m);
  219                 /* Start counter */
  220                 outw(a + 6, 0x8000);
  221 
  222                 *error = 0;
  223         }
  224 }
  225 
  226 /*
  227  * The Advantech PCM-582x watchdog expects 0x1 at I/O port 0x0443
  228  * every 1.6 secs +/- 30%. Writing 0x0 disables the watchdog
  229  * NB: reading the I/O port enables the timer as well
  230  */
  231 static void
  232 advantech_watchdog(void *foo __unused, u_int cmd, int *error)
  233 {
  234         u_int u;
  235 
  236         u = cmd & WD_INTERVAL;
  237         if (u > 0 && u <= WD_TO_1SEC) {
  238                 outb(0x0443, 1);
  239                 *error = 0;
  240         } else {
  241                 outb(0x0443, 0);
  242         }
  243 }
  244 
  245 static int
  246 geode_probe(device_t self)
  247 {
  248 #define BIOS_OEM_MAXLEN 80
  249         static u_char bios_oem[BIOS_OEM_MAXLEN] = "\0";
  250 
  251         switch (pci_get_devid(self)) {
  252         case 0x0515100b:
  253                 if (geode_counter == 0) {
  254                         /*
  255                          * The address of the CBA is written to this register
  256                          * by the bios, see p161 in data sheet.
  257                          */
  258                         cba = pci_read_config(self, 0x64, 4);
  259                         printf("Geode CBA@ 0x%x\n", cba);
  260                         geode_counter = cba + 0x08;
  261                         outl(cba + 0x0d, 2);
  262                         printf("Geode rev: %02x %02x\n",
  263                                 inb(cba + 0x3c), inb(cba + 0x3d));
  264                         tc_init(&geode_timecounter);
  265                         EVENTHANDLER_REGISTER(watchdog_list, geode_watchdog,
  266                             NULL, 0);
  267                         set_cputicker(geode_cputicks, 27000000, 0);
  268                 }
  269                 break;
  270         case 0x0510100b:
  271                 gpio = pci_read_config(self, PCIR_BAR(0), 4);
  272                 gpio &= ~0x1f;
  273                 printf("Geode GPIO@ = %x\n", gpio);
  274                 if ( bios_oem_strings(&bios_soekris,
  275                                         bios_oem, BIOS_OEM_MAXLEN) > 0 ) {
  276                         led1b = 20;
  277                         led1 = led_create(led_func, &led1b, "error");
  278                 } else if ( bios_oem_strings(&bios_pcengines,
  279                                         bios_oem, BIOS_OEM_MAXLEN) > 0 ) {
  280                         led1b = -2;
  281                         led2b = -3;
  282                         led3b = -18;
  283                         led1 = led_create(led_func, &led1b, "led1");
  284                         led2 = led_create(led_func, &led2b, "led2");
  285                         led3 = led_create(led_func, &led3b, "led3");
  286                         /*
  287                         * Turn on first LED so we don't make
  288                         * people think their box just died.
  289                         */
  290                         led_func(&led1b, 1);
  291                 }
  292                 if ( strlen(bios_oem) )
  293                         printf("Geode %s\n", bios_oem);
  294                 break;
  295         case 0x01011078:
  296                 if ( bios_oem_strings(&bios_advantech,
  297                                 bios_oem, BIOS_OEM_MAXLEN) > 0 ) {
  298                         printf("Geode %s\n", bios_oem);
  299                         EVENTHANDLER_REGISTER(watchdog_list, advantech_watchdog,
  300                             NULL, 0);
  301                 }
  302                 break;
  303         case 0x20801022:
  304                 if ( bios_oem_strings(&bios_soekris_55,
  305                     bios_oem, BIOS_OEM_MAXLEN) > 0 ) {
  306                         printf("Geode LX: %s\n", bios_oem);
  307                         led1b = 6;
  308                         led1 = led_create(cs5536_led_func, &led1b, "error");
  309                 }
  310                 printf("MFGPT bar: %jx\n", rdmsr(0x5140000d));
  311                 EVENTHANDLER_REGISTER(watchdog_list, cs5536_watchdog,
  312                     NULL, 0);
  313                 break;
  314         }
  315         return (ENXIO);
  316 }
  317 
  318 static int
  319 geode_attach(device_t self)
  320 {
  321 
  322         return(ENODEV);
  323 }
  324 
  325 static device_method_t geode_methods[] = {
  326         /* Device interface */
  327         DEVMETHOD(device_probe,         geode_probe),
  328         DEVMETHOD(device_attach,        geode_attach),
  329         DEVMETHOD(device_suspend,       bus_generic_suspend),
  330         DEVMETHOD(device_resume,        bus_generic_resume),
  331         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  332         {0, 0}
  333 };
  334  
  335 static driver_t geode_driver = {
  336         "geode",
  337         geode_methods,
  338         0,
  339 };
  340 
  341 static devclass_t geode_devclass;
  342 
  343 DRIVER_MODULE(geode, pci, geode_driver, geode_devclass, 0, 0);

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