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Annotation of Gnu-Mach/chips/frc.c, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Mach Operating System
                      3:  * Copyright (c) 1993,1992 Carnegie Mellon University
                      4:  * All Rights Reserved.
                      5:  * 
                      6:  * Permission to use, copy, modify and distribute this software and its
                      7:  * documentation is hereby granted, provided that both the copyright
                      8:  * notice and this permission notice appear in all copies of the
                      9:  * software, derivative works or modified versions, and any portions
                     10:  * thereof, and that both notices appear in supporting documentation.
                     11:  * 
                     12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     15:  * 
                     16:  * Carnegie Mellon requests users of this software to return to
                     17:  * 
                     18:  *  Software Distribution Coordinator  or  [email protected]
                     19:  *  School of Computer Science
                     20:  *  Carnegie Mellon University
                     21:  *  Pittsburgh PA 15213-3890
                     22:  * 
                     23:  * any improvements or extensions that they make and grant Carnegie Mellon
                     24:  * the rights to redistribute these changes.
                     25:  */
                     26: /*
                     27:  *     File: frc.c
                     28:  *     Author: Alessandro Forin, Carnegie Mellon University
                     29:  *     Date:   3/92
                     30:  *
                     31:  *     Generic, mappable free running counter driver.
                     32:  */
                     33: 
                     34: #include <frc.h>
                     35: #if    NFRC > 0
                     36: 
                     37: #include <mach/std_types.h>
                     38: #include <chips/busses.h>
                     39: #include <device/device_types.h>
                     40: 
                     41: /*
                     42:  * Machine defines
                     43:  * All you need to do to get this working on a
                     44:  * random box is to define one macro and provide
                     45:  * the correct virtual address.
                     46:  */
                     47: #include       <platforms.h>
                     48: #ifdef DECSTATION
                     49: #define        btop(x)         mips_btop(x)
                     50: #endif /* DECSTATION */
                     51: 
                     52: /*
                     53:  * Autoconf info
                     54:  */
                     55: 
                     56: static vm_offset_t frc_std[NFRC] = { 0 };
                     57: static vm_size_t frc_offset[NFRC] = { 0 };
                     58: static struct bus_device *frc_info[NFRC];
                     59: static int frc_probe(vm_offset_t,struct bus_ctlr *);
                     60: static void frc_attach(struct bus_device *);
                     61: 
                     62: struct bus_driver frc_driver =
                     63:        { frc_probe, 0, frc_attach, 0, frc_std, "frc", frc_info, };
                     64: 
                     65: /*
                     66:  * Externally visible functions
                     67:  */
                     68: io_return_t    frc_openclose(int,int);                 /* user */
                     69: vm_offset_t    frc_mmap(int,vm_offset_t,vm_prot_t);
                     70: void           frc_set_address(int,vm_size_t);
                     71: 
                     72: /*
                     73:  * FRC's in kernel virtual memory.  For in-kernel timestamps.
                     74:  */
                     75: vm_offset_t frc_address[NFRC];
                     76: 
                     77: /* machine-specific setups */
                     78: void
                     79: frc_set_address(
                     80:        int             unit,
                     81:        vm_size_t       offset)
                     82: {
                     83:        if (unit < NFRC) {
                     84:                frc_offset[unit] =  offset;
                     85:        }
                     86: }
                     87: 
                     88: 
                     89: /*
                     90:  * Probe chip to see if it is there
                     91:  */
                     92: static frc_probe (
                     93:        vm_offset_t     reg,
                     94:        struct bus_ctlr *ui)
                     95: {
                     96:        /* see if something present at the given address */
                     97:        if (check_memory(reg, 0)) {
                     98:                frc_address[ui->unit] = 0;
                     99:                return 0;
                    100:        }
                    101:        frc_std[ui->unit] = (vm_offset_t) reg;
                    102:        printf("[mappable] ");
                    103:        return 1;
                    104: }
                    105: 
                    106: static void
                    107: frc_attach (
                    108:                   struct bus_device *ui)
                    109: {
                    110:        if (ui->unit < NFRC) {
                    111:                frc_address[ui->unit] =
                    112:                        (vm_offset_t) frc_std[ui->unit] + frc_offset[ui->unit];
                    113:                printf(": free running counter %d at kernel vaddr 0x%x",
                    114:                       ui->unit, frc_address[ui->unit]);
                    115:        }
                    116:        else
                    117:                panic("frc: unknown unit number"); /* shouldn't happen */
                    118: }
                    119: 
                    120: int frc_intr()
                    121: {
                    122:        /* we do not expect interrupts */
                    123:        panic("frc_intr");
                    124: }
                    125: 
                    126: io_return_t
                    127: frc_openclose(
                    128:              int dev, 
                    129:              int flag)
                    130: {
                    131:   if (frc_std[dev])
                    132:     return D_SUCCESS;
                    133:   else
                    134:     return D_NO_SUCH_DEVICE;
                    135: }
                    136: 
                    137: vm_offset_t
                    138: frc_mmap(
                    139:        int             dev,
                    140:        vm_offset_t     off,
                    141:        vm_prot_t       prot)
                    142: {
                    143:        vm_offset_t addr;
                    144:        if ((prot & VM_PROT_WRITE) || (off >= PAGE_SIZE) )
                    145:                return (-1);
                    146:        addr = (vm_offset_t) frc_std[dev] + frc_offset[dev];
                    147:        return btop(pmap_extract(pmap_kernel(), addr));
                    148: }
                    149: 
                    150: #endif

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