2 * BIOS Flash chip on Intel 440GX board.
4 * Bugs this currently does not work under linuxBIOS.
7 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
12 #include <linux/mtd/mtd.h>
13 #include <linux/mtd/map.h>
15 #define PIIXE_IOBASE_RESOURCE 11
17 #define WINDOW_ADDR 0xfff00000
18 #define WINDOW_SIZE 0x00100000
23 #define TRIBUF_PORT (IOBASE+0x37)
24 #define VPP_PORT (IOBASE+0x28)
26 static struct mtd_info *mymtd;
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)
36 spin_lock_irqsave(&l440gx_vpp_lock, flags);
38 if (++l440gx_vpp_refcnt == 1) /* first nested 'on' */
39 outl(inl(VPP_PORT) | 1, VPP_PORT);
41 if (--l440gx_vpp_refcnt == 0) /* last nested 'off' */
42 outl(inl(VPP_PORT) & ~1, VPP_PORT);
44 spin_unlock_irqrestore(&l440gx_vpp_lock, flags);
47 static struct map_info l440gx_map = {
48 .name = "L440GX BIOS",
50 .bankwidth = BUSWIDTH,
53 /* FIXME verify that this is the
54 * appripriate code for vpp enable/disable
56 .set_vpp = l440gx_set_vpp
60 static int __init init_l440gx(void)
62 struct pci_dev *dev, *pm_dev;
63 struct resource *pm_iobase;
66 dev = pci_get_device(PCI_VENDOR_ID_INTEL,
67 PCI_DEVICE_ID_INTEL_82371AB_0, NULL);
69 pm_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
70 PCI_DEVICE_ID_INTEL_82371AB_3, NULL);
74 if (!dev || !pm_dev) {
75 printk(KERN_NOTICE "L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue\n");
80 l440gx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
82 if (!l440gx_map.virt) {
83 printk(KERN_WARNING "Failed to ioremap L440GX flash region\n");
87 simple_map_init(&l440gx_map);
88 printk(KERN_NOTICE "window_addr = 0x%08lx\n", (unsigned long)l440gx_map.virt);
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
95 pm_iobase = &pm_dev->resource[PIIXE_IOBASE_RESOURCE];
96 if (!(pm_iobase->flags & IORESOURCE_IO)) {
97 pm_iobase->name = "pm iobase";
100 pm_iobase->flags = IORESOURCE_IO;
102 /* Put the current value in the resource */
103 pci_read_config_dword(pm_dev, 0x40, &iobase);
105 pm_iobase->start += iobase & ~1;
106 pm_iobase->end += iobase & ~1;
110 /* Allocate the resource region */
111 if (pci_assign_resource(pm_dev, PIIXE_IOBASE_RESOURCE) != 0) {
114 printk(KERN_WARNING "Could not allocate pm iobase resource\n");
115 iounmap(l440gx_map.virt);
120 iobase = pm_iobase->start;
121 pci_write_config_dword(pm_dev, 0x40, iobase | 1);
125 pci_read_config_word(dev, 0x4e, &word);
127 pci_write_config_word(dev, 0x4e, word);
129 /* Supply write voltage to the chip */
130 l440gx_set_vpp(&l440gx_map, 1);
132 /* Enable the gate on the WE line */
133 outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT);
135 printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n");
137 mymtd = do_map_probe("jedec_probe", &l440gx_map);
139 printk(KERN_NOTICE "JEDEC probe on BIOS chip failed. Using ROM\n");
140 mymtd = do_map_probe("map_rom", &l440gx_map);
143 mymtd->owner = THIS_MODULE;
145 mtd_device_register(mymtd, NULL, 0);
149 iounmap(l440gx_map.virt);
153 static void __exit cleanup_l440gx(void)
155 mtd_device_unregister(mymtd);
158 iounmap(l440gx_map.virt);
161 module_init(init_l440gx);
162 module_exit(cleanup_l440gx);
164 MODULE_LICENSE("GPL");
166 MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards");