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Annotation of Gnu-Mach/linux/src/drivers/block/rz1000.c, revision 1.1.1.1

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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