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 add_mtd_device(mymtd); 142 return 0; 143 } 144 145 iounmap(l440gx_map.virt); 146 return -ENXIO; 147 } 148 149 static void __exit cleanup_l440gx(void) 150 { 151 del_mtd_device(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"); 163