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 DEFINE_SPINLOCK(l440gx_vpp_lock); 31 static int l440gx_vpp_refcnt; 32 static void l440gx_set_vpp(struct map_info *map, int vpp) 33 { 34 unsigned long flags; 35 36 spin_lock_irqsave(&l440gx_vpp_lock, flags); 37 if (vpp) { 38 if (++l440gx_vpp_refcnt == 1) /* first nested 'on' */ 39 outl(inl(VPP_PORT) | 1, VPP_PORT); 40 } else { 41 if (--l440gx_vpp_refcnt == 0) /* last nested 'off' */ 42 outl(inl(VPP_PORT) & ~1, VPP_PORT); 43 } 44 spin_unlock_irqrestore(&l440gx_vpp_lock, flags); 45 } 46 47 static struct map_info l440gx_map = { 48 .name = "L440GX BIOS", 49 .size = WINDOW_SIZE, 50 .bankwidth = BUSWIDTH, 51 .phys = WINDOW_ADDR, 52 #if 0 53 /* FIXME verify that this is the 54 * appripriate code for vpp enable/disable 55 */ 56 .set_vpp = l440gx_set_vpp 57 #endif 58 }; 59 60 static int __init init_l440gx(void) 61 { 62 struct pci_dev *dev, *pm_dev; 63 struct resource *pm_iobase; 64 __u16 word; 65 66 dev = pci_get_device(PCI_VENDOR_ID_INTEL, 67 PCI_DEVICE_ID_INTEL_82371AB_0, NULL); 68 69 pm_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 70 PCI_DEVICE_ID_INTEL_82371AB_3, NULL); 71 72 pci_dev_put(dev); 73 74 if (!dev || !pm_dev) { 75 printk(KERN_NOTICE "L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue\n"); 76 pci_dev_put(pm_dev); 77 return -ENODEV; 78 } 79 80 l440gx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE); 81 82 if (!l440gx_map.virt) { 83 printk(KERN_WARNING "Failed to ioremap L440GX flash region\n"); 84 pci_dev_put(pm_dev); 85 return -ENOMEM; 86 } 87 simple_map_init(&l440gx_map); 88 printk(KERN_NOTICE "window_addr = 0x%08lx\n", (unsigned long)l440gx_map.virt); 89 90 /* Setup the pm iobase resource 91 * This code should move into some kind of generic bridge 92 * driver but for the moment I'm content with getting the 93 * allocation correct. 94 */ 95 pm_iobase = &pm_dev->resource[PIIXE_IOBASE_RESOURCE]; 96 if (!(pm_iobase->flags & IORESOURCE_IO)) { 97 pm_iobase->name = "pm iobase"; 98 pm_iobase->start = 0; 99 pm_iobase->end = 63; 100 pm_iobase->flags = IORESOURCE_IO; 101 102 /* Put the current value in the resource */ 103 pci_read_config_dword(pm_dev, 0x40, &iobase); 104 iobase &= ~1; 105 pm_iobase->start += iobase & ~1; 106 pm_iobase->end += iobase & ~1; 107 108 pci_dev_put(pm_dev); 109 110 /* Allocate the resource region */ 111 if (pci_assign_resource(pm_dev, PIIXE_IOBASE_RESOURCE) != 0) { 112 pci_dev_put(dev); 113 pci_dev_put(pm_dev); 114 printk(KERN_WARNING "Could not allocate pm iobase resource\n"); 115 iounmap(l440gx_map.virt); 116 return -ENXIO; 117 } 118 } 119 /* Set the iobase */ 120 iobase = pm_iobase->start; 121 pci_write_config_dword(pm_dev, 0x40, iobase | 1); 122 123 124 /* Set XBCS# */ 125 pci_read_config_word(dev, 0x4e, &word); 126 word |= 0x4; 127 pci_write_config_word(dev, 0x4e, word); 128 129 /* Supply write voltage to the chip */ 130 l440gx_set_vpp(&l440gx_map, 1); 131 132 /* Enable the gate on the WE line */ 133 outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT); 134 135 printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n"); 136 137 mymtd = do_map_probe("jedec_probe", &l440gx_map); 138 if (!mymtd) { 139 printk(KERN_NOTICE "JEDEC probe on BIOS chip failed. Using ROM\n"); 140 mymtd = do_map_probe("map_rom", &l440gx_map); 141 } 142 if (mymtd) { 143 mymtd->owner = THIS_MODULE; 144 145 mtd_device_register(mymtd, NULL, 0); 146 return 0; 147 } 148 149 iounmap(l440gx_map.virt); 150 return -ENXIO; 151 } 152 153 static void __exit cleanup_l440gx(void) 154 { 155 mtd_device_unregister(mymtd); 156 map_destroy(mymtd); 157 158 iounmap(l440gx_map.virt); 159 } 160 161 module_init(init_l440gx); 162 module_exit(cleanup_l440gx); 163 164 MODULE_LICENSE("GPL"); 165 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); 166 MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards"); 167