diff options
Diffstat (limited to 'drivers/mtd/maps/ichxrom.c')
| -rw-r--r-- | drivers/mtd/maps/ichxrom.c | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/drivers/mtd/maps/ichxrom.c b/drivers/mtd/maps/ichxrom.c new file mode 100644 index 000000000..fda72c5fd --- /dev/null +++ b/drivers/mtd/maps/ichxrom.c @@ -0,0 +1,383 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ichxrom.c + * + * Normal mappings of chips in physical memory + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <asm/io.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/cfi.h> +#include <linux/mtd/flashchip.h> +#include <linux/pci.h> +#include <linux/pci_ids.h> +#include <linux/list.h> + +#define xstr(s) str(s) +#define str(s) #s +#define MOD_NAME xstr(KBUILD_BASENAME) + +#define ADDRESS_NAME_LEN 18 + +#define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */ + +#define BIOS_CNTL 0x4e +#define FWH_DEC_EN1 0xE3 +#define FWH_DEC_EN2 0xF0 +#define FWH_SEL1 0xE8 +#define FWH_SEL2 0xEE + +struct ichxrom_window { + void __iomem* virt; + unsigned long phys; + unsigned long size; + struct list_head maps; + struct resource rsrc; + struct pci_dev *pdev; +}; + +struct ichxrom_map_info { + struct list_head list; + struct map_info map; + struct mtd_info *mtd; + struct resource rsrc; + char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN]; +}; + +static struct ichxrom_window ichxrom_window = { + .maps = LIST_HEAD_INIT(ichxrom_window.maps), +}; + +static void ichxrom_cleanup(struct ichxrom_window *window) +{ + struct ichxrom_map_info *map, *scratch; + u16 word; + int ret; + + /* Disable writes through the rom window */ + ret = pci_read_config_word(window->pdev, BIOS_CNTL, &word); + if (!ret) + pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1); + pci_dev_put(window->pdev); + + /* Free all of the mtd devices */ + list_for_each_entry_safe(map, scratch, &window->maps, list) { + if (map->rsrc.parent) + release_resource(&map->rsrc); + mtd_device_unregister(map->mtd); + map_destroy(map->mtd); + list_del(&map->list); + kfree(map); + } + if (window->rsrc.parent) + release_resource(&window->rsrc); + if (window->virt) { + iounmap(window->virt); + window->virt = NULL; + window->phys = 0; + window->size = 0; + window->pdev = NULL; + } +} + + +static int __init ichxrom_init_one(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL }; + struct ichxrom_window *window = &ichxrom_window; + struct ichxrom_map_info *map = NULL; + unsigned long map_top; + u8 byte; + u16 word; + + /* For now I just handle the ichx and I assume there + * are not a lot of resources up at the top of the address + * space. It is possible to handle other devices in the + * top 16MB but it is very painful. Also since + * you can only really attach a FWH to an ICHX there + * a number of simplifications you can make. + * + * Also you can page firmware hubs if an 8MB window isn't enough + * but don't currently handle that case either. + */ + window->pdev = pdev; + + /* Find a region continuous to the end of the ROM window */ + window->phys = 0; + pci_read_config_byte(pdev, FWH_DEC_EN1, &byte); + if (byte == 0xff) { + window->phys = 0xffc00000; + pci_read_config_byte(pdev, FWH_DEC_EN2, &byte); + if ((byte & 0x0f) == 0x0f) { + window->phys = 0xff400000; + } + else if ((byte & 0x0e) == 0x0e) { + window->phys = 0xff500000; + } + else if ((byte & 0x0c) == 0x0c) { + window->phys = 0xff600000; + } + else if ((byte & 0x08) == 0x08) { + window->phys = 0xff700000; + } + } + else if ((byte & 0xfe) == 0xfe) { + window->phys = 0xffc80000; + } + else if ((byte & 0xfc) == 0xfc) { + window->phys = 0xffd00000; + } + else if ((byte & 0xf8) == 0xf8) { + window->phys = 0xffd80000; + } + else if ((byte & 0xf0) == 0xf0) { + window->phys = 0xffe00000; + } + else if ((byte & 0xe0) == 0xe0) { + window->phys = 0xffe80000; + } + else if ((byte & 0xc0) == 0xc0) { + window->phys = 0xfff00000; + } + else if ((byte & 0x80) == 0x80) { + window->phys = 0xfff80000; + } + + if (window->phys == 0) { + printk(KERN_ERR MOD_NAME ": Rom window is closed\n"); + goto out; + } + window->phys -= 0x400000UL; + window->size = (0xffffffffUL - window->phys) + 1UL; + + /* Enable writes through the rom window */ + pci_read_config_word(pdev, BIOS_CNTL, &word); + if (!(word & 1) && (word & (1<<1))) { + /* The BIOS will generate an error if I enable + * this device, so don't even try. + */ + printk(KERN_ERR MOD_NAME ": firmware access control, I can't enable writes\n"); + goto out; + } + pci_write_config_word(pdev, BIOS_CNTL, word | 1); + + /* + * Try to reserve the window mem region. If this fails then + * it is likely due to the window being "reserved" by the BIOS. + */ + window->rsrc.name = MOD_NAME; + window->rsrc.start = window->phys; + window->rsrc.end = window->phys + window->size - 1; + window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; + if (request_resource(&iomem_resource, &window->rsrc)) { + window->rsrc.parent = NULL; + printk(KERN_DEBUG MOD_NAME ": " + "%s(): Unable to register resource %pR - kernel bug?\n", + __func__, &window->rsrc); + } + + /* Map the firmware hub into my address space. */ + window->virt = ioremap(window->phys, window->size); + if (!window->virt) { + printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n", + window->phys, window->size); + goto out; + } + + /* Get the first address to look for an rom chip at */ + map_top = window->phys; + if ((window->phys & 0x3fffff) != 0) { + map_top = window->phys + 0x400000; + } +#if 1 + /* The probe sequence run over the firmware hub lock + * registers sets them to 0x7 (no access). + * Probe at most the last 4M of the address space. + */ + if (map_top < 0xffc00000) { + map_top = 0xffc00000; + } +#endif + /* Loop through and look for rom chips */ + while((map_top - 1) < 0xffffffffUL) { + struct cfi_private *cfi; + unsigned long offset; + int i; + + if (!map) { + map = kmalloc(sizeof(*map), GFP_KERNEL); + } + if (!map) { + printk(KERN_ERR MOD_NAME ": kmalloc failed"); + goto out; + } + memset(map, 0, sizeof(*map)); + INIT_LIST_HEAD(&map->list); + map->map.name = map->map_name; + map->map.phys = map_top; + offset = map_top - window->phys; + map->map.virt = (void __iomem *) + (((unsigned long)(window->virt)) + offset); + map->map.size = 0xffffffffUL - map_top + 1UL; + /* Set the name of the map to the address I am trying */ + sprintf(map->map_name, "%s @%08Lx", + MOD_NAME, (unsigned long long)map->map.phys); + + /* Firmware hubs only use vpp when being programmed + * in a factory setting. So in-place programming + * needs to use a different method. + */ + for(map->map.bankwidth = 32; map->map.bankwidth; + map->map.bankwidth >>= 1) + { + char **probe_type; + /* Skip bankwidths that are not supported */ + if (!map_bankwidth_supported(map->map.bankwidth)) + continue; + + /* Setup the map methods */ + simple_map_init(&map->map); + + /* Try all of the probe methods */ + probe_type = rom_probe_types; + for(; *probe_type; probe_type++) { + map->mtd = do_map_probe(*probe_type, &map->map); + if (map->mtd) + goto found; + } + } + map_top += ROM_PROBE_STEP_SIZE; + continue; + found: + /* Trim the size if we are larger than the map */ + if (map->mtd->size > map->map.size) { + printk(KERN_WARNING MOD_NAME + " rom(%llu) larger than window(%lu). fixing...\n", + (unsigned long long)map->mtd->size, map->map.size); + map->mtd->size = map->map.size; + } + if (window->rsrc.parent) { + /* + * Registering the MTD device in iomem may not be possible + * if there is a BIOS "reserved" and BUSY range. If this + * fails then continue anyway. + */ + map->rsrc.name = map->map_name; + map->rsrc.start = map->map.phys; + map->rsrc.end = map->map.phys + map->mtd->size - 1; + map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY; + if (request_resource(&window->rsrc, &map->rsrc)) { + printk(KERN_ERR MOD_NAME + ": cannot reserve MTD resource\n"); + map->rsrc.parent = NULL; + } + } + + /* Make the whole region visible in the map */ + map->map.virt = window->virt; + map->map.phys = window->phys; + cfi = map->map.fldrv_priv; + for(i = 0; i < cfi->numchips; i++) { + cfi->chips[i].start += offset; + } + + /* Now that the mtd devices is complete claim and export it */ + map->mtd->owner = THIS_MODULE; + if (mtd_device_register(map->mtd, NULL, 0)) { + map_destroy(map->mtd); + map->mtd = NULL; + goto out; + } + + + /* Calculate the new value of map_top */ + map_top += map->mtd->size; + + /* File away the map structure */ + list_add(&map->list, &window->maps); + map = NULL; + } + + out: + /* Free any left over map structures */ + kfree(map); + + /* See if I have any map structures */ + if (list_empty(&window->maps)) { + ichxrom_cleanup(window); + return -ENODEV; + } + return 0; +} + + +static void ichxrom_remove_one(struct pci_dev *pdev) +{ + struct ichxrom_window *window = &ichxrom_window; + ichxrom_cleanup(window); +} + +static const struct pci_device_id ichxrom_pci_tbl[] = { + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, + PCI_ANY_ID, PCI_ANY_ID, }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0, + PCI_ANY_ID, PCI_ANY_ID, }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, + PCI_ANY_ID, PCI_ANY_ID, }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, + PCI_ANY_ID, PCI_ANY_ID, }, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1, + PCI_ANY_ID, PCI_ANY_ID, }, + { 0, }, +}; + +#if 0 +MODULE_DEVICE_TABLE(pci, ichxrom_pci_tbl); + +static struct pci_driver ichxrom_driver = { + .name = MOD_NAME, + .id_table = ichxrom_pci_tbl, + .probe = ichxrom_init_one, + .remove = ichxrom_remove_one, +}; +#endif + +static int __init init_ichxrom(void) +{ + struct pci_dev *pdev; + const struct pci_device_id *id; + + pdev = NULL; + for (id = ichxrom_pci_tbl; id->vendor; id++) { + pdev = pci_get_device(id->vendor, id->device, NULL); + if (pdev) { + break; + } + } + if (pdev) { + return ichxrom_init_one(pdev, &ichxrom_pci_tbl[0]); + } + return -ENXIO; +#if 0 + return pci_register_driver(&ichxrom_driver); +#endif +} + +static void __exit cleanup_ichxrom(void) +{ + ichxrom_remove_one(ichxrom_window.pdev); +} + +module_init(init_ichxrom); +module_exit(cleanup_ichxrom); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>"); +MODULE_DESCRIPTION("MTD map driver for BIOS chips on the ICHX southbridge"); |