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1// SPDX-License-Identifier: GPL-2.0-only2/*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 1117 18#define WINDOW_ADDR 0xfff0000019#define WINDOW_SIZE 0x0010000020#define BUSWIDTH 121 22static u32 iobase;23#define IOBASE iobase24#define TRIBUF_PORT (IOBASE+0x37)25#define VPP_PORT (IOBASE+0x28)26 27static struct mtd_info *mymtd;28 29 30/* Is this really the vpp port? */31static DEFINE_SPINLOCK(l440gx_vpp_lock);32static int l440gx_vpp_refcnt;33static 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 48static struct map_info l440gx_map = {49 .name = "L440GX BIOS",50 .size = WINDOW_SIZE,51 .bankwidth = BUSWIDTH,52 .phys = WINDOW_ADDR,53#if 054 /* FIXME verify that this is the55 * appripriate code for vpp enable/disable56 */57 .set_vpp = l440gx_set_vpp58#endif59};60 61static 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 resource92 * This code should move into some kind of generic bridge93 * driver but for the moment I'm content with getting the94 * 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 154static void __exit cleanup_l440gx(void)155{156 mtd_device_unregister(mymtd);157 map_destroy(mymtd);158 159 iounmap(l440gx_map.virt);160}161 162module_init(init_l440gx);163module_exit(cleanup_l440gx);164 165MODULE_LICENSE("GPL");166MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");167MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards");168