drivers/mtd/maps/l440gx.c

   1 /*
   2  * BIOS Flash chip on Intel 440GX board.
   3  *
   4  * Bugs this currently does not work under linuxBIOS.
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/pci.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <asm/io.h>
  12 #include <linux/mtd/mtd.h>
  13 #include <linux/mtd/map.h>
  14
  15 #define PIIXE_IOBASE_RESOURCE   11
  16
  17 #define WINDOW_ADDR 0xfff00000
  18 #define WINDOW_SIZE 0x00100000
  19 #define BUSWIDTH 1
  20
  21 static u32 iobase;
  22 #define IOBASE iobase
  23 #define TRIBUF_PORT (IOBASE+0x37)
  24 #define VPP_PORT (IOBASE+0x28)
  25
  26 static struct mtd_info *mymtd;
  27
  28
  29 /* Is this really the vpp port? */
  30 static void l440gx_set_vpp(struct map_info *map, int vpp)
  31 {
  32         unsigned long l;
  33
  34         l = inl(VPP_PORT);
  35         if (vpp) {
  36                 l |= 1;
  37         } else {
  38                 l &= ~1;
  39         }
  40         outl(l, VPP_PORT);
  41 }
  42
  43 static struct map_info l440gx_map = {
  44         .name = "L440GX BIOS",
  45         .size = WINDOW_SIZE,
  46         .bankwidth = BUSWIDTH,
  47         .phys = WINDOW_ADDR,
  48 #if 0
  49         /* FIXME verify that this is the
  50          * appripriate code for vpp enable/disable
  51          */
  52         .set_vpp = l440gx_set_vpp
  53 #endif
  54 };
  55
  56 static int __init init_l440gx(void)
  57 {
  58         struct pci_dev *dev, *pm_dev;
  59         struct resource *pm_iobase;
  60         __u16 word;
  61
  62         dev = pci_get_device(PCI_VENDOR_ID_INTEL,
  63                 PCI_DEVICE_ID_INTEL_82371AB_0, NULL);
  64
  65         pm_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
  66                 PCI_DEVICE_ID_INTEL_82371AB_3, NULL);
  67
  68         pci_dev_put(dev);
  69
  70         if (!dev || !pm_dev) {
  71                 printk(KERN_NOTICE "L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue\n");
  72                 pci_dev_put(pm_dev);
  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                 pci_dev_put(pm_dev);
  81                 return -ENOMEM;
  82         }
  83         simple_map_init(&l440gx_map);
  84         printk(KERN_NOTICE "window_addr = 0x%08lx\n", (unsigned long)l440gx_map.virt);
  85
  86         /* Setup the pm iobase resource
  87          * This code should move into some kind of generic bridge
  88          * driver but for the moment I'm content with getting the
  89          * allocation correct.
  90          */
  91         pm_iobase = &pm_dev->resource[PIIXE_IOBASE_RESOURCE];
  92         if (!(pm_iobase->flags & IORESOURCE_IO)) {
  93                 pm_iobase->name = "pm iobase";
  94                 pm_iobase->start = 0;
  95                 pm_iobase->end = 63;
  96                 pm_iobase->flags = IORESOURCE_IO;
  97
  98                 /* Put the current value in the resource */
  99                 pci_read_config_dword(pm_dev, 0x40, &iobase);
 100                 iobase &= ~1;
 101                 pm_iobase->start += iobase & ~1;
 102                 pm_iobase->end += iobase & ~1;
 103
 104                 pci_dev_put(pm_dev);
 105
 106                 /* Allocate the resource region */
 107                 if (pci_assign_resource(pm_dev, PIIXE_IOBASE_RESOURCE) != 0) {
 108                         pci_dev_put(dev);
 109                         pci_dev_put(pm_dev);
 110                         printk(KERN_WARNING "Could not allocate pm iobase resource\n");
 111                         iounmap(l440gx_map.virt);
 112                         return -ENXIO;
 113                 }
 114         }
 115         /* Set the iobase */
 116         iobase = pm_iobase->start;
 117         pci_write_config_dword(pm_dev, 0x40, iobase | 1);
 118
 119
 120         /* Set XBCS# */
 121         pci_read_config_word(dev, 0x4e, &word);
 122         word |= 0x4;
 123         pci_write_config_word(dev, 0x4e, word);
 124
 125         /* Supply write voltage to the chip */
 126         l440gx_set_vpp(&l440gx_map, 1);
 127
 128         /* Enable the gate on the WE line */
 129         outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT);
 130
 131         printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n");
 132
 133         mymtd = do_map_probe("jedec_probe", &l440gx_map);
 134         if (!mymtd) {
 135                 printk(KERN_NOTICE "JEDEC probe on BIOS chip failed. Using ROM\n");
 136                 mymtd = do_map_probe("map_rom", &l440gx_map);
 137         }
 138         if (mymtd) {
 139                 mymtd->owner = THIS_MODULE;
 140
 141                 mtd_device_register(mymtd, NULL, 0);
 142                 return 0;
 143         }
 144
 145         iounmap(l440gx_map.virt);
 146         return -ENXIO;
 147 }
 148
 149 static void __exit cleanup_l440gx(void)
 150 {
 151         mtd_device_unregister(mymtd);
 152         map_destroy(mymtd);
 153
 154         iounmap(l440gx_map.virt);
 155 }
 156
 157 module_init(init_l440gx);
 158 module_exit(cleanup_l440gx);
 159
 160 MODULE_LICENSE("GPL");
 161 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 162 MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards");