1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * BIOS Flash chip on Intel 440GX board. 4 * 5 * Bugs this currently does not work under linuxBIOS. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/pci.h> 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <asm/io.h> 13 #include <linux/mtd/mtd.h> 14 #include <linux/mtd/map.h> 15 16 #define PIIXE_IOBASE_RESOURCE 11 17 18 #define WINDOW_ADDR 0xfff00000 19 #define WINDOW_SIZE 0x00100000 20 #define BUSWIDTH 1 21 22 static u32 iobase; 23 #define IOBASE iobase 24 #define TRIBUF_PORT (IOBASE+0x37) 25 #define VPP_PORT (IOBASE+0x28) 26 27 static struct mtd_info *mymtd; 28 29 30 /* Is this really the vpp port? */ 31 static DEFINE_SPINLOCK(l440gx_vpp_lock); 32 static int l440gx_vpp_refcnt; 33 static void l440gx_set_vpp(struct map_info *map, int vpp) 34 { 35 unsigned long flags; 36 37 spin_lock_irqsave(&l440gx_vpp_lock, flags); 38 if (vpp) { 39 if (++l440gx_vpp_refcnt == 1) /* first nested 'on' */ 40 outl(inl(VPP_PORT) | 1, VPP_PORT); 41 } else { 42 if (--l440gx_vpp_refcnt == 0) /* last nested 'off' */ 43 outl(inl(VPP_PORT) & ~1, VPP_PORT); 44 } 45 spin_unlock_irqrestore(&l440gx_vpp_lock, flags); 46 } 47 48 static struct map_info l440gx_map = { 49 .name = "L440GX BIOS", 50 .size = WINDOW_SIZE, 51 .bankwidth = BUSWIDTH, 52 .phys = WINDOW_ADDR, 53 #if 0 54 /* FIXME verify that this is the 55 * appripriate code for vpp enable/disable 56 */ 57 .set_vpp = l440gx_set_vpp 58 #endif 59 }; 60 61 static int __init init_l440gx(void) 62 { 63 struct pci_dev *dev, *pm_dev; 64 struct resource *pm_iobase; 65 __u16 word; 66 67 dev = pci_get_device(PCI_VENDOR_ID_INTEL, 68 PCI_DEVICE_ID_INTEL_82371AB_0, NULL); 69 70 pm_dev = pci_get_device(PCI_VENDOR_ID_INTEL, 71 PCI_DEVICE_ID_INTEL_82371AB_3, NULL); 72 73 pci_dev_put(dev); 74 75 if (!dev || !pm_dev) { 76 printk(KERN_NOTICE "L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue\n"); 77 pci_dev_put(pm_dev); 78 return -ENODEV; 79 } 80 81 l440gx_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE); 82 83 if (!l440gx_map.virt) { 84 printk(KERN_WARNING "Failed to ioremap L440GX flash region\n"); 85 pci_dev_put(pm_dev); 86 return -ENOMEM; 87 } 88 simple_map_init(&l440gx_map); 89 pr_debug("window_addr = %p\n", l440gx_map.virt); 90 91 /* Setup the pm iobase resource 92 * This code should move into some kind of generic bridge 93 * driver but for the moment I'm content with getting the 94 * allocation correct. 95 */ 96 pm_iobase = &pm_dev->resource[PIIXE_IOBASE_RESOURCE]; 97 if (!(pm_iobase->flags & IORESOURCE_IO)) { 98 pm_iobase->name = "pm iobase"; 99 pm_iobase->start = 0; 100 pm_iobase->end = 63; 101 pm_iobase->flags = IORESOURCE_IO; 102 103 /* Put the current value in the resource */ 104 pci_read_config_dword(pm_dev, 0x40, &iobase); 105 iobase &= ~1; 106 pm_iobase->start += iobase & ~1; 107 pm_iobase->end += iobase & ~1; 108 109 pci_dev_put(pm_dev); 110 111 /* Allocate the resource region */ 112 if (pci_assign_resource(pm_dev, PIIXE_IOBASE_RESOURCE) != 0) { 113 pci_dev_put(dev); 114 pci_dev_put(pm_dev); 115 printk(KERN_WARNING "Could not allocate pm iobase resource\n"); 116 iounmap(l440gx_map.virt); 117 return -ENXIO; 118 } 119 } 120 /* Set the iobase */ 121 iobase = pm_iobase->start; 122 pci_write_config_dword(pm_dev, 0x40, iobase | 1); 123 124 125 /* Set XBCS# */ 126 pci_read_config_word(dev, 0x4e, &word); 127 word |= 0x4; 128 pci_write_config_word(dev, 0x4e, word); 129 130 /* Supply write voltage to the chip */ 131 l440gx_set_vpp(&l440gx_map, 1); 132 133 /* Enable the gate on the WE line */ 134 outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT); 135 136 printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n"); 137 138 mymtd = do_map_probe("jedec_probe", &l440gx_map); 139 if (!mymtd) { 140 printk(KERN_NOTICE "JEDEC probe on BIOS chip failed. Using ROM\n"); 141 mymtd = do_map_probe("map_rom", &l440gx_map); 142 } 143 if (mymtd) { 144 mymtd->owner = THIS_MODULE; 145 146 mtd_device_register(mymtd, NULL, 0); 147 return 0; 148 } 149 150 iounmap(l440gx_map.virt); 151 return -ENXIO; 152 } 153 154 static void __exit cleanup_l440gx(void) 155 { 156 mtd_device_unregister(mymtd); 157 map_destroy(mymtd); 158 159 iounmap(l440gx_map.virt); 160 } 161 162 module_init(init_l440gx); 163 module_exit(cleanup_l440gx); 164 165 MODULE_LICENSE("GPL"); 166 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); 167 MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards"); 168