drivers/mtd/maps/l440gx.c

   1 /*
   2  * $Id: l440gx.c,v 1.17 2004/11/28 09:40:39 dwmw2 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 #include <linux/config.h>
  17
  18 #define PIIXE_IOBASE_RESOURCE   11
  19
  20 #define WINDOW_ADDR 0xfff00000
  21 #define WINDOW_SIZE 0x00100000
  22 #define BUSWIDTH 1
  23
  24 static u32 iobase;
  25 #define IOBASE iobase
  26 #define TRIBUF_PORT (IOBASE+0x37)
  27 #define VPP_PORT (IOBASE+0x28)
  28
  29 static struct mtd_info *mymtd;
  30
  31
  32 /* Is this really the vpp port? */
  33 static void l440gx_set_vpp(struct map_info *map, int vpp)
  34 {
  35         unsigned long l;
  36
  37         l = inl(VPP_PORT);
  38         if (vpp) {
  39                 l |= 1;
  40         } else {
  41                 l &= ~1;
  42         }
  43         outl(l, VPP_PORT);
  44 }
  45
  46 static struct map_info l440gx_map = {
  47         .name = "L440GX BIOS",
  48         .size = WINDOW_SIZE,
  49         .bankwidth = BUSWIDTH,
  50         .phys = WINDOW_ADDR,
  51 #if 0
  52         /* FIXME verify that this is the
  53          * appripriate code for vpp enable/disable
  54          */
  55         .set_vpp = l440gx_set_vpp
  56 #endif
  57 };
  58
  59 static int __init init_l440gx(void)
  60 {
  61         struct pci_dev *dev, *pm_dev;
  62         struct resource *pm_iobase;
  63         __u16 word;
  64
  65         dev = pci_find_device(PCI_VENDOR_ID_INTEL,
  66                 PCI_DEVICE_ID_INTEL_82371AB_0, NULL);
  67
  68         pm_dev = pci_find_device(PCI_VENDOR_ID_INTEL,
  69                 PCI_DEVICE_ID_INTEL_82371AB_3, NULL);
  70
  71         if (!dev || !pm_dev) {
  72                 printk(KERN_NOTICE "L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue\n");
  73                 return -ENODEV;
  74         }
  75
  76         l440gx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
  77
  78         if (!l440gx_map.virt) {
  79                 printk(KERN_WARNING "Failed to ioremap L440GX flash region\n");
  80                 return -ENOMEM;
  81         }
  82         simple_map_init(&l440gx_map);
  83         printk(KERN_NOTICE "window_addr = 0x%08lx\n", (unsigned long)l440gx_map.virt);
  84
  85         /* Setup the pm iobase resource
  86          * This code should move into some kind of generic bridge
  87          * driver but for the moment I'm content with getting the
  88          * allocation correct.
  89          */
  90         pm_iobase = &pm_dev->resource[PIIXE_IOBASE_RESOURCE];
  91         if (!(pm_iobase->flags & IORESOURCE_IO)) {
  92                 pm_iobase->name = "pm iobase";
  93                 pm_iobase->start = 0;
  94                 pm_iobase->end = 63;
  95                 pm_iobase->flags = IORESOURCE_IO;
  96
  97                 /* Put the current value in the resource */
  98                 pci_read_config_dword(pm_dev, 0x40, &iobase);
  99                 iobase &= ~1;
 100                 pm_iobase->start += iobase & ~1;
 101                 pm_iobase->end += iobase & ~1;
 102
 103                 /* Allocate the resource region */
 104                 if (pci_assign_resource(pm_dev, PIIXE_IOBASE_RESOURCE) != 0) {
 105                         printk(KERN_WARNING "Could not allocate pm iobase resource\n");
 106                         iounmap(l440gx_map.virt);
 107                         return -ENXIO;
 108                 }
 109         }
 110         /* Set the iobase */
 111         iobase = pm_iobase->start;
 112         pci_write_config_dword(pm_dev, 0x40, iobase | 1);
 113
 114
 115         /* Set XBCS# */
 116         pci_read_config_word(dev, 0x4e, &word);
 117         word |= 0x4;
 118         pci_write_config_word(dev, 0x4e, word);
 119
 120         /* Supply write voltage to the chip */
 121         l440gx_set_vpp(&l440gx_map, 1);
 122
 123         /* Enable the gate on the WE line */
 124         outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT);
 125
 126         printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n");
 127
 128         mymtd = do_map_probe("jedec_probe", &l440gx_map);
 129         if (!mymtd) {
 130                 printk(KERN_NOTICE "JEDEC probe on BIOS chip failed. Using ROM\n");
 131                 mymtd = do_map_probe("map_rom", &l440gx_map);
 132         }
 133         if (mymtd) {
 134                 mymtd->owner = THIS_MODULE;
 135
 136                 add_mtd_device(mymtd);
 137                 return 0;
 138         }
 139
 140         iounmap(l440gx_map.virt);
 141         return -ENXIO;
 142 }
 143
 144 static void __exit cleanup_l440gx(void)
 145 {
 146         del_mtd_device(mymtd);
 147         map_destroy(mymtd);
 148
 149         iounmap(l440gx_map.virt);
 150 }
 151
 152 module_init(init_l440gx);
 153 module_exit(cleanup_l440gx);
 154
 155 MODULE_LICENSE("GPL");
 156 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 157 MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards");