drivers/mtd/maps/l440gx.c

   1 /*
   2  * $Id: l440gx.c,v 1.18 2005/11/07 11:14:27 gleixner Exp $
   3  *
   4  * BIOS Flash chip on Intel 440GX board.
   5  *
   6  * Bugs this currently does not work under linuxBIOS.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/pci.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <asm/io.h>
  14 #include <linux/mtd/mtd.h>
  15 #include <linux/mtd/map.h>
  16
  17 #define PIIXE_IOBASE_RESOURCE   11
  18
  19 #define WINDOW_ADDR 0xfff00000
  20 #define WINDOW_SIZE 0x00100000
  21 #define BUSWIDTH 1
  22
  23 static u32 iobase;
  24 #define IOBASE iobase
  25 #define TRIBUF_PORT (IOBASE+0x37)
  26 #define VPP_PORT (IOBASE+0x28)
  27
  28 static struct mtd_info *mymtd;
  29
  30
  31 /* Is this really the vpp port? */
  32 static void l440gx_set_vpp(struct map_info *map, int vpp)
  33 {
  34         unsigned long l;
  35
  36         l = inl(VPP_PORT);
  37         if (vpp) {
  38                 l |= 1;
  39         } else {
  40                 l &= ~1;
  41         }
  42         outl(l, VPP_PORT);
  43 }
  44
  45 static struct map_info l440gx_map = {
  46         .name = "L440GX BIOS",
  47         .size = WINDOW_SIZE,
  48         .bankwidth = BUSWIDTH,
  49         .phys = WINDOW_ADDR,
  50 #if 0
  51         /* FIXME verify that this is the
  52          * appripriate code for vpp enable/disable
  53          */
  54         .set_vpp = l440gx_set_vpp
  55 #endif
  56 };
  57
  58 static int __init init_l440gx(void)
  59 {
  60         struct pci_dev *dev, *pm_dev;
  61         struct resource *pm_iobase;
  62         __u16 word;
  63
  64         dev = pci_find_device(PCI_VENDOR_ID_INTEL,
  65                 PCI_DEVICE_ID_INTEL_82371AB_0, NULL);
  66
  67         pm_dev = pci_find_device(PCI_VENDOR_ID_INTEL,
  68                 PCI_DEVICE_ID_INTEL_82371AB_3, NULL);
  69
  70         if (!dev || !pm_dev) {
  71                 printk(KERN_NOTICE "L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue\n");
  72                 return -ENODEV;
  73         }
  74
  75         l440gx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
  76
  77         if (!l440gx_map.virt) {
  78                 printk(KERN_WARNING "Failed to ioremap L440GX flash region\n");
  79                 return -ENOMEM;
  80         }
  81         simple_map_init(&l440gx_map);
  82         printk(KERN_NOTICE "window_addr = 0x%08lx\n", (unsigned long)l440gx_map.virt);
  83
  84         /* Setup the pm iobase resource
  85          * This code should move into some kind of generic bridge
  86          * driver but for the moment I'm content with getting the
  87          * allocation correct.
  88          */
  89         pm_iobase = &pm_dev->resource[PIIXE_IOBASE_RESOURCE];
  90         if (!(pm_iobase->flags & IORESOURCE_IO)) {
  91                 pm_iobase->name = "pm iobase";
  92                 pm_iobase->start = 0;
  93                 pm_iobase->end = 63;
  94                 pm_iobase->flags = IORESOURCE_IO;
  95
  96                 /* Put the current value in the resource */
  97                 pci_read_config_dword(pm_dev, 0x40, &iobase);
  98                 iobase &= ~1;
  99                 pm_iobase->start += iobase & ~1;
 100                 pm_iobase->end += iobase & ~1;
 101
 102                 /* Allocate the resource region */
 103                 if (pci_assign_resource(pm_dev, PIIXE_IOBASE_RESOURCE) != 0) {
 104                         printk(KERN_WARNING "Could not allocate pm iobase resource\n");
 105                         iounmap(l440gx_map.virt);
 106                         return -ENXIO;
 107                 }
 108         }
 109         /* Set the iobase */
 110         iobase = pm_iobase->start;
 111         pci_write_config_dword(pm_dev, 0x40, iobase | 1);
 112
 113
 114         /* Set XBCS# */
 115         pci_read_config_word(dev, 0x4e, &word);
 116         word |= 0x4;
 117         pci_write_config_word(dev, 0x4e, word);
 118
 119         /* Supply write voltage to the chip */
 120         l440gx_set_vpp(&l440gx_map, 1);
 121
 122         /* Enable the gate on the WE line */
 123         outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT);
 124
 125         printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n");
 126
 127         mymtd = do_map_probe("jedec_probe", &l440gx_map);
 128         if (!mymtd) {
 129                 printk(KERN_NOTICE "JEDEC probe on BIOS chip failed. Using ROM\n");
 130                 mymtd = do_map_probe("map_rom", &l440gx_map);
 131         }
 132         if (mymtd) {
 133                 mymtd->owner = THIS_MODULE;
 134
 135                 add_mtd_device(mymtd);
 136                 return 0;
 137         }
 138
 139         iounmap(l440gx_map.virt);
 140         return -ENXIO;
 141 }
 142
 143 static void __exit cleanup_l440gx(void)
 144 {
 145         del_mtd_device(mymtd);
 146         map_destroy(mymtd);
 147
 148         iounmap(l440gx_map.virt);
 149 }
 150
 151 module_init(init_l440gx);
 152 module_exit(cleanup_l440gx);
 153
 154 MODULE_LICENSE("GPL");
 155 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 156 MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards");