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 #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"); 158