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Annotation of Gnu-Mach/linux/src/drivers/block/rz1000.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *  linux/drivers/block/rz1000.c       Version 0.03  Mar 20, 1996
        !             3:  *
        !             4:  *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
        !             5:  */
        !             6: 
        !             7: /*
        !             8:  *  Principal Author/Maintainer:  [email protected] (Mark Lord)
        !             9:  *
        !            10:  *  This file provides support for disabling the buggy read-ahead
        !            11:  *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
        !            12:  */
        !            13: 
        !            14: #undef REALLY_SLOW_IO          /* most systems can safely undef this */
        !            15: 
        !            16: #include <linux/types.h>
        !            17: #include <linux/kernel.h>
        !            18: #include <linux/delay.h>
        !            19: #include <linux/timer.h>
        !            20: #include <linux/mm.h>
        !            21: #include <linux/ioport.h>
        !            22: #include <linux/blkdev.h>
        !            23: #include <linux/hdreg.h>
        !            24: #include <asm/io.h>
        !            25: #include <linux/bios32.h>
        !            26: #include <linux/pci.h>
        !            27: #include "ide.h"
        !            28: 
        !            29: static void ide_pci_access_error (int rc)
        !            30: {
        !            31:        printk("ide: pcibios access failed - %s\n", pcibios_strerror(rc));
        !            32: }
        !            33: 
        !            34: void init_rz1000 (byte bus, byte fn)
        !            35: {
        !            36:        int rc;
        !            37:        unsigned short reg;
        !            38: 
        !            39:        printk("ide0: buggy RZ1000 interface: ");
        !            40:        if ((rc = pcibios_read_config_word (bus, fn, PCI_COMMAND, &reg))) {
        !            41:                ide_pci_access_error (rc);
        !            42:        } else if (!(reg & 1)) {
        !            43:                printk("not enabled\n");
        !            44:        } else {
        !            45:                if ((rc = pcibios_read_config_word(bus, fn, 0x40, &reg))
        !            46:                 || (rc =  pcibios_write_config_word(bus, fn, 0x40, reg & 0xdfff)))
        !            47:                {
        !            48:                        ide_hwifs[0].drives[0].no_unmask = 1;
        !            49:                        ide_hwifs[0].drives[1].no_unmask = 1;
        !            50:                        ide_hwifs[1].drives[0].no_unmask = 1;
        !            51:                        ide_hwifs[1].drives[1].no_unmask = 1;
        !            52:                        ide_hwifs[0].serialized = 1;
        !            53:                        ide_hwifs[1].serialized = 1;
        !            54:                        ide_pci_access_error (rc);
        !            55:                        printk("serialized, disabled unmasking\n");
        !            56:                } else
        !            57:                        printk("disabled read-ahead\n");
        !            58:        }
        !            59: }

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