349 lines
9.1 KiB
C
349 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* amd76xrom.c
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*
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* Normal mappings of chips in physical memory
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/cfi.h>
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#include <linux/mtd/flashchip.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#include <linux/list.h>
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#define xstr(s) str(s)
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#define str(s) #s
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#define MOD_NAME xstr(KBUILD_BASENAME)
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#define ADDRESS_NAME_LEN 18
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#define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */
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struct amd76xrom_window {
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void __iomem *virt;
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unsigned long phys;
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unsigned long size;
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struct list_head maps;
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struct resource rsrc;
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struct pci_dev *pdev;
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};
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struct amd76xrom_map_info {
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struct list_head list;
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struct map_info map;
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struct mtd_info *mtd;
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struct resource rsrc;
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char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
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};
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/* The 2 bits controlling the window size are often set to allow reading
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* the BIOS, but too small to allow writing, since the lock registers are
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* 4MiB lower in the address space than the data.
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*
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* This is intended to prevent flashing the bios, perhaps accidentally.
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*
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* This parameter allows the normal driver to over-ride the BIOS settings.
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*
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* The bits are 6 and 7. If both bits are set, it is a 5MiB window.
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* If only the 7 Bit is set, it is a 4MiB window. Otherwise, a
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* 64KiB window.
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*
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*/
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static uint win_size_bits;
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module_param(win_size_bits, uint, 0);
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MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x43 byte, normally set by BIOS.");
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static struct amd76xrom_window amd76xrom_window = {
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.maps = LIST_HEAD_INIT(amd76xrom_window.maps),
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};
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static void amd76xrom_cleanup(struct amd76xrom_window *window)
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{
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struct amd76xrom_map_info *map, *scratch;
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u8 byte;
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if (window->pdev) {
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/* Disable writes through the rom window */
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pci_read_config_byte(window->pdev, 0x40, &byte);
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pci_write_config_byte(window->pdev, 0x40, byte & ~1);
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pci_dev_put(window->pdev);
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}
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/* Free all of the mtd devices */
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list_for_each_entry_safe(map, scratch, &window->maps, list) {
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if (map->rsrc.parent) {
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release_resource(&map->rsrc);
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}
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mtd_device_unregister(map->mtd);
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map_destroy(map->mtd);
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list_del(&map->list);
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kfree(map);
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}
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if (window->rsrc.parent)
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release_resource(&window->rsrc);
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if (window->virt) {
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iounmap(window->virt);
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window->virt = NULL;
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window->phys = 0;
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window->size = 0;
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window->pdev = NULL;
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}
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}
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static int amd76xrom_init_one(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
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u8 byte;
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struct amd76xrom_window *window = &amd76xrom_window;
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struct amd76xrom_map_info *map = NULL;
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unsigned long map_top;
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/* Remember the pci dev I find the window in - already have a ref */
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window->pdev = pdev;
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/* Enable the selected rom window. This is often incorrectly
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* set up by the BIOS, and the 4MiB offset for the lock registers
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* requires the full 5MiB of window space.
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*
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* This 'write, then read' approach leaves the bits for
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* other uses of the hardware info.
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*/
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pci_read_config_byte(pdev, 0x43, &byte);
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pci_write_config_byte(pdev, 0x43, byte | win_size_bits );
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/* Assume the rom window is properly setup, and find it's size */
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pci_read_config_byte(pdev, 0x43, &byte);
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if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) {
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window->phys = 0xffb00000; /* 5MiB */
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}
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else if ((byte & (1<<7)) == (1<<7)) {
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window->phys = 0xffc00000; /* 4MiB */
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}
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else {
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window->phys = 0xffff0000; /* 64KiB */
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}
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window->size = 0xffffffffUL - window->phys + 1UL;
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/*
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* Try to reserve the window mem region. If this fails then
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* it is likely due to a fragment of the window being
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* "reserved" by the BIOS. In the case that the
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* request_mem_region() fails then once the rom size is
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* discovered we will try to reserve the unreserved fragment.
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*/
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window->rsrc.name = MOD_NAME;
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window->rsrc.start = window->phys;
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window->rsrc.end = window->phys + window->size - 1;
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window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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if (request_resource(&iomem_resource, &window->rsrc)) {
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window->rsrc.parent = NULL;
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printk(KERN_ERR MOD_NAME
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" %s(): Unable to register resource %pR - kernel bug?\n",
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__func__, &window->rsrc);
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return -EBUSY;
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}
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/* Enable writes through the rom window */
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pci_read_config_byte(pdev, 0x40, &byte);
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pci_write_config_byte(pdev, 0x40, byte | 1);
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/* FIXME handle registers 0x80 - 0x8C the bios region locks */
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/* For write accesses caches are useless */
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window->virt = ioremap(window->phys, window->size);
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if (!window->virt) {
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printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
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window->phys, window->size);
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goto out;
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}
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/* Get the first address to look for an rom chip at */
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map_top = window->phys;
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#if 1
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/* The probe sequence run over the firmware hub lock
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* registers sets them to 0x7 (no access).
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* Probe at most the last 4M of the address space.
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*/
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if (map_top < 0xffc00000) {
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map_top = 0xffc00000;
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}
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#endif
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/* Loop through and look for rom chips */
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while((map_top - 1) < 0xffffffffUL) {
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struct cfi_private *cfi;
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unsigned long offset;
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int i;
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if (!map) {
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map = kmalloc(sizeof(*map), GFP_KERNEL);
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if (!map)
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goto out;
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}
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memset(map, 0, sizeof(*map));
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INIT_LIST_HEAD(&map->list);
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map->map.name = map->map_name;
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map->map.phys = map_top;
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offset = map_top - window->phys;
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map->map.virt = (void __iomem *)
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(((unsigned long)(window->virt)) + offset);
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map->map.size = 0xffffffffUL - map_top + 1UL;
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/* Set the name of the map to the address I am trying */
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sprintf(map->map_name, "%s @%08Lx",
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MOD_NAME, (unsigned long long)map->map.phys);
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/* There is no generic VPP support */
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for(map->map.bankwidth = 32; map->map.bankwidth;
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map->map.bankwidth >>= 1)
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{
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char **probe_type;
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/* Skip bankwidths that are not supported */
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if (!map_bankwidth_supported(map->map.bankwidth))
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continue;
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/* Setup the map methods */
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simple_map_init(&map->map);
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/* Try all of the probe methods */
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probe_type = rom_probe_types;
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for(; *probe_type; probe_type++) {
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map->mtd = do_map_probe(*probe_type, &map->map);
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if (map->mtd)
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goto found;
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}
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}
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map_top += ROM_PROBE_STEP_SIZE;
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continue;
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found:
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/* Trim the size if we are larger than the map */
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if (map->mtd->size > map->map.size) {
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printk(KERN_WARNING MOD_NAME
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" rom(%llu) larger than window(%lu). fixing...\n",
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(unsigned long long)map->mtd->size, map->map.size);
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map->mtd->size = map->map.size;
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}
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if (window->rsrc.parent) {
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/*
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* Registering the MTD device in iomem may not be possible
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* if there is a BIOS "reserved" and BUSY range. If this
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* fails then continue anyway.
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*/
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map->rsrc.name = map->map_name;
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map->rsrc.start = map->map.phys;
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map->rsrc.end = map->map.phys + map->mtd->size - 1;
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map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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if (request_resource(&window->rsrc, &map->rsrc)) {
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printk(KERN_ERR MOD_NAME
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": cannot reserve MTD resource\n");
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map->rsrc.parent = NULL;
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}
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}
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/* Make the whole region visible in the map */
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map->map.virt = window->virt;
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map->map.phys = window->phys;
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cfi = map->map.fldrv_priv;
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for(i = 0; i < cfi->numchips; i++) {
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cfi->chips[i].start += offset;
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}
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/* Now that the mtd devices is complete claim and export it */
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map->mtd->owner = THIS_MODULE;
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if (mtd_device_register(map->mtd, NULL, 0)) {
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map_destroy(map->mtd);
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map->mtd = NULL;
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goto out;
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}
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/* Calculate the new value of map_top */
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map_top += map->mtd->size;
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/* File away the map structure */
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list_add(&map->list, &window->maps);
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map = NULL;
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}
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out:
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/* Free any left over map structures */
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kfree(map);
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/* See if I have any map structures */
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if (list_empty(&window->maps)) {
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amd76xrom_cleanup(window);
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return -ENODEV;
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}
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return 0;
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}
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static void amd76xrom_remove_one(struct pci_dev *pdev)
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{
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struct amd76xrom_window *window = &amd76xrom_window;
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amd76xrom_cleanup(window);
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}
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static const struct pci_device_id amd76xrom_pci_tbl[] = {
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{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
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PCI_ANY_ID, PCI_ANY_ID, },
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{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440,
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PCI_ANY_ID, PCI_ANY_ID, },
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{ PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl);
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#if 0
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static struct pci_driver amd76xrom_driver = {
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.name = MOD_NAME,
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.id_table = amd76xrom_pci_tbl,
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.probe = amd76xrom_init_one,
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.remove = amd76xrom_remove_one,
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};
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#endif
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static int __init init_amd76xrom(void)
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{
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struct pci_dev *pdev;
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const struct pci_device_id *id;
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pdev = NULL;
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for(id = amd76xrom_pci_tbl; id->vendor; id++) {
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pdev = pci_get_device(id->vendor, id->device, NULL);
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if (pdev) {
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break;
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}
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}
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if (pdev) {
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return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]);
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}
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return -ENXIO;
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#if 0
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return pci_register_driver(&amd76xrom_driver);
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#endif
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}
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static void __exit cleanup_amd76xrom(void)
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{
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amd76xrom_remove_one(amd76xrom_window.pdev);
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}
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module_init(init_amd76xrom);
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module_exit(cleanup_amd76xrom);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
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MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge");
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