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"); 157