File:  [DragonFly] / src / sys / i386 / i386 / Attic / elan-mmcr.c
Revision 1.6: download - view: text, annotated - select for diffs
Thu May 13 23:49:23 2004 UTC (10 years, 2 months ago) by dillon
Branches: MAIN
CVS tags: HEAD
device switch 1/many: Remove d_autoq, add d_clone (where d_autoq was).

d_autoq was used to allow the device port dispatch to mix old-style synchronous
calls with new style messaging calls within a particular device.  It was never
used for that purpose.

d_clone will be more fully implemented as work continues.  We are going to
install d_port in the dev_t (struct specinfo) structure itself and d_clone
will be needed to allow devices to 'revector' the port on a minor-number
by minor-number basis, in particular allowing minor numbers to be directly
dispatched to distinct threads.  This is something we will be needing later
on.

    1: /*
    2:  * ----------------------------------------------------------------------------
    3:  * "THE BEER-WARE LICENSE" (Revision 42):
    4:  * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
    5:  * can do whatever you want with this stuff. If we meet some day, and you think
    6:  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
    7:  * ----------------------------------------------------------------------------
    8:  *
    9:  * $FreeBSD: src/sys/i386/i386/elan-mmcr.c,v 1.6.2.1 2002/09/17 22:39:53 sam Exp $
   10:  * $DragonFly: src/sys/i386/i386/elan-mmcr.c,v 1.6 2004/05/13 23:49:23 dillon Exp $
   11:  * The AMD Elan sc520 is a system-on-chip gadget which is used in embedded
   12:  * kind of things, see www.soekris.com for instance, and it has a few quirks
   13:  * we need to deal with.
   14:  * Unfortunately we cannot identify the gadget by CPUID output because it
   15:  * depends on strapping options and only the stepping field may be useful
   16:  * and those are undocumented from AMDs side.
   17:  *
   18:  * So instead we recognize the on-chip host-PCI bridge and call back from
   19:  * sys/i386/pci/pci_bus.c to here if we find it.
   20:  */
   21: 
   22: #include <sys/param.h>
   23: #include <sys/systm.h>
   24: #include <sys/kernel.h>
   25: #include <sys/conf.h>
   26: #include <sys/proc.h>
   27: #include <sys/sysctl.h>
   28: #include <sys/time.h>
   29: 
   30: #include <machine/md_var.h>
   31: 
   32: #include <vm/vm.h>
   33: #include <vm/pmap.h>
   34: 
   35: uint16_t *elan_mmcr;
   36: 
   37: #if 0
   38: 
   39: static unsigned
   40: elan_get_timecount(struct timecounter *tc)
   41: {
   42: 	return (elan_mmcr[0xc84 / 2]);
   43: }
   44: 
   45: static struct timecounter elan_timecounter = {
   46: 	elan_get_timecount,
   47: 	0,
   48: 	0xffff,
   49: 	33333333 / 4,
   50: 	"ELAN"
   51: };
   52: 
   53: #endif
   54: 
   55: void
   56: init_AMD_Elan_sc520(void)
   57: {
   58: 	u_int new;
   59: 	int i;
   60: 
   61: 	if (bootverbose)
   62: 		printf("Doing h0h0magic for AMD Elan sc520\n");
   63: 	elan_mmcr = pmap_mapdev(0xfffef000, 0x1000);
   64: 
   65: 	/*-
   66: 	 * The i8254 is driven with a nonstandard frequency which is
   67: 	 * derived thusly:
   68: 	 *   f = 32768 * 45 * 25 / 31 = 1189161.29...
   69: 	 * We use the sysctl to get the timecounter etc into whack.
   70: 	 */
   71: 	
   72: 	new = 1189161;
   73: 	i = kernel_sysctlbyname("machdep.i8254_freq", 
   74: 	    NULL, 0, 
   75: 	    &new, sizeof new, 
   76: 	    NULL);
   77: 	if (bootverbose)
   78: 		printf("sysctl machdep.i8254_freq=%d returns %d\n", new, i);
   79: 
   80: #if 0
   81: 	/* Start GP timer #2 and use it as timecounter, hz permitting */
   82: 	elan_mmcr[0xc82 / 2] = 0xc001;
   83: 	init_timecounter(&elan_timecounter);
   84: #endif
   85: }
   86: 
   87: 
   88: /*
   89:  * Device driver initialization stuff
   90:  */
   91: 
   92: static d_open_t	elan_open;
   93: static d_close_t elan_close;
   94: static d_ioctl_t elan_ioctl;
   95: static d_mmap_t elan_mmap;
   96: 
   97: #define CDEV_MAJOR 100			/* Share with xrpu */
   98: static struct cdevsw elan_cdevsw = {
   99: 	/* name */	"elan",
  100: 	/* maj */	CDEV_MAJOR,
  101: 	/* flags */	0,
  102: 	/* port */	NULL,
  103: 	/* clone */	NULL,
  104: 
  105: 	/* open */	elan_open,
  106: 	/* close */	elan_close,
  107: 	/* read */	noread,
  108: 	/* write */	nowrite,
  109: 	/* ioctl */	elan_ioctl,
  110: 	/* poll */	nopoll,
  111: 	/* mmap */	elan_mmap,
  112: 	/* strategy */	nostrategy,
  113: 	/* dump */	nodump,
  114: 	/* psize */	nopsize
  115: };
  116: 
  117: static int
  118: elan_open(dev_t dev, int flag, int mode, struct thread *td)
  119: {
  120: 	return (0);
  121: }
  122: 
  123: static int
  124: elan_close(dev_t dev, int flag, int mode, struct thread *td)
  125: { 
  126: 	return (0);
  127: }
  128: 
  129: static int
  130: elan_mmap(dev_t dev, vm_offset_t offset, int nprot)
  131: {
  132: 	if (offset >= 0x1000) 
  133: 		return (-1);
  134: 	return (i386_btop(0xfffef000));
  135: }
  136: 
  137: static int
  138: elan_ioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct thread *td)
  139: {
  140: 	return(ENOENT);
  141: }
  142: 
  143: static void
  144: elan_drvinit(void)
  145: {
  146: 
  147: 	if (elan_mmcr == NULL)
  148: 		return;
  149: 	printf("Elan-mmcr driver: MMCR at %p\n", elan_mmcr);
  150: 	make_dev(&elan_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "elan-mmcr");
  151: 	return;
  152: }
  153: 
  154: SYSINIT(elan, SI_SUB_PSEUDO, SI_ORDER_MIDDLE+CDEV_MAJOR,elan_drvinit,NULL);