diff options
Diffstat (limited to 'drivers/mtd/maps/l440gx.c')
| -rw-r--r-- | drivers/mtd/maps/l440gx.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/mtd/maps/l440gx.c b/drivers/mtd/maps/l440gx.c new file mode 100644 index 000000000..832b880d1 --- /dev/null +++ b/drivers/mtd/maps/l440gx.c @@ -0,0 +1,167 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * BIOS Flash chip on Intel 440GX board. + * + * Bugs this currently does not work under linuxBIOS. + */ + +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <asm/io.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> + +#define PIIXE_IOBASE_RESOURCE 11 + +#define WINDOW_ADDR 0xfff00000 +#define WINDOW_SIZE 0x00100000 +#define BUSWIDTH 1 + +static u32 iobase; +#define IOBASE iobase +#define TRIBUF_PORT (IOBASE+0x37) +#define VPP_PORT (IOBASE+0x28) + +static struct mtd_info *mymtd; + + +/* Is this really the vpp port? */ +static DEFINE_SPINLOCK(l440gx_vpp_lock); +static int l440gx_vpp_refcnt; +static void l440gx_set_vpp(struct map_info *map, int vpp) +{ + unsigned long flags; + + spin_lock_irqsave(&l440gx_vpp_lock, flags); + if (vpp) { + if (++l440gx_vpp_refcnt == 1) /* first nested 'on' */ + outl(inl(VPP_PORT) | 1, VPP_PORT); + } else { + if (--l440gx_vpp_refcnt == 0) /* last nested 'off' */ + outl(inl(VPP_PORT) & ~1, VPP_PORT); + } + spin_unlock_irqrestore(&l440gx_vpp_lock, flags); +} + +static struct map_info l440gx_map = { + .name = "L440GX BIOS", + .size = WINDOW_SIZE, + .bankwidth = BUSWIDTH, + .phys = WINDOW_ADDR, +#if 0 + /* FIXME verify that this is the + * appripriate code for vpp enable/disable + */ + .set_vpp = l440gx_set_vpp +#endif +}; + +static int __init init_l440gx(void) +{ + struct pci_dev *dev, *pm_dev; + struct resource *pm_iobase; + __u16 word; + + dev = pci_get_device(PCI_VENDOR_ID_INTEL, + PCI_DEVICE_ID_INTEL_82371AB_0, NULL); + + pm_dev = pci_get_device(PCI_VENDOR_ID_INTEL, + PCI_DEVICE_ID_INTEL_82371AB_3, NULL); + + pci_dev_put(dev); + + if (!dev || !pm_dev) { + printk(KERN_NOTICE "L440GX flash mapping: failed to find PIIX4 ISA bridge, cannot continue\n"); + pci_dev_put(pm_dev); + return -ENODEV; + } + + l440gx_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE); + + if (!l440gx_map.virt) { + printk(KERN_WARNING "Failed to ioremap L440GX flash region\n"); + pci_dev_put(pm_dev); + return -ENOMEM; + } + simple_map_init(&l440gx_map); + pr_debug("window_addr = %p\n", l440gx_map.virt); + + /* Setup the pm iobase resource + * This code should move into some kind of generic bridge + * driver but for the moment I'm content with getting the + * allocation correct. + */ + pm_iobase = &pm_dev->resource[PIIXE_IOBASE_RESOURCE]; + if (!(pm_iobase->flags & IORESOURCE_IO)) { + pm_iobase->name = "pm iobase"; + pm_iobase->start = 0; + pm_iobase->end = 63; + pm_iobase->flags = IORESOURCE_IO; + + /* Put the current value in the resource */ + pci_read_config_dword(pm_dev, 0x40, &iobase); + iobase &= ~1; + pm_iobase->start += iobase & ~1; + pm_iobase->end += iobase & ~1; + + pci_dev_put(pm_dev); + + /* Allocate the resource region */ + if (pci_assign_resource(pm_dev, PIIXE_IOBASE_RESOURCE) != 0) { + pci_dev_put(dev); + pci_dev_put(pm_dev); + printk(KERN_WARNING "Could not allocate pm iobase resource\n"); + iounmap(l440gx_map.virt); + return -ENXIO; + } + } + /* Set the iobase */ + iobase = pm_iobase->start; + pci_write_config_dword(pm_dev, 0x40, iobase | 1); + + + /* Set XBCS# */ + pci_read_config_word(dev, 0x4e, &word); + word |= 0x4; + pci_write_config_word(dev, 0x4e, word); + + /* Supply write voltage to the chip */ + l440gx_set_vpp(&l440gx_map, 1); + + /* Enable the gate on the WE line */ + outb(inb(TRIBUF_PORT) & ~1, TRIBUF_PORT); + + printk(KERN_NOTICE "Enabled WE line to L440GX BIOS flash chip.\n"); + + mymtd = do_map_probe("jedec_probe", &l440gx_map); + if (!mymtd) { + printk(KERN_NOTICE "JEDEC probe on BIOS chip failed. Using ROM\n"); + mymtd = do_map_probe("map_rom", &l440gx_map); + } + if (mymtd) { + mymtd->owner = THIS_MODULE; + + mtd_device_register(mymtd, NULL, 0); + return 0; + } + + iounmap(l440gx_map.virt); + return -ENXIO; +} + +static void __exit cleanup_l440gx(void) +{ + mtd_device_unregister(mymtd); + map_destroy(mymtd); + + iounmap(l440gx_map.virt); +} + +module_init(init_l440gx); +module_exit(cleanup_l440gx); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); +MODULE_DESCRIPTION("MTD map driver for BIOS chips on Intel L440GX motherboards"); |