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381 lines
9.7 KiB
381 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* ichxrom.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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#define BIOS_CNTL 0x4e |
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#define FWH_DEC_EN1 0xE3 |
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#define FWH_DEC_EN2 0xF0 |
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#define FWH_SEL1 0xE8 |
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#define FWH_SEL2 0xEE |
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struct ichxrom_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 ichxrom_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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static struct ichxrom_window ichxrom_window = { |
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.maps = LIST_HEAD_INIT(ichxrom_window.maps), |
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}; |
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static void ichxrom_cleanup(struct ichxrom_window *window) |
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{ |
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struct ichxrom_map_info *map, *scratch; |
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u16 word; |
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int ret; |
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/* Disable writes through the rom window */ |
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ret = pci_read_config_word(window->pdev, BIOS_CNTL, &word); |
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if (!ret) |
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pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1); |
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pci_dev_put(window->pdev); |
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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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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 __init ichxrom_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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struct ichxrom_window *window = &ichxrom_window; |
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struct ichxrom_map_info *map = NULL; |
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unsigned long map_top; |
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u8 byte; |
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u16 word; |
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/* For now I just handle the ichx and I assume there |
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* are not a lot of resources up at the top of the address |
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* space. It is possible to handle other devices in the |
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* top 16MB but it is very painful. Also since |
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* you can only really attach a FWH to an ICHX there |
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* a number of simplifications you can make. |
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* |
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* Also you can page firmware hubs if an 8MB window isn't enough |
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* but don't currently handle that case either. |
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*/ |
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window->pdev = pdev; |
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/* Find a region continuous to the end of the ROM window */ |
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window->phys = 0; |
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pci_read_config_byte(pdev, FWH_DEC_EN1, &byte); |
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if (byte == 0xff) { |
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window->phys = 0xffc00000; |
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pci_read_config_byte(pdev, FWH_DEC_EN2, &byte); |
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if ((byte & 0x0f) == 0x0f) { |
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window->phys = 0xff400000; |
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} |
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else if ((byte & 0x0e) == 0x0e) { |
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window->phys = 0xff500000; |
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} |
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else if ((byte & 0x0c) == 0x0c) { |
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window->phys = 0xff600000; |
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} |
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else if ((byte & 0x08) == 0x08) { |
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window->phys = 0xff700000; |
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} |
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} |
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else if ((byte & 0xfe) == 0xfe) { |
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window->phys = 0xffc80000; |
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} |
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else if ((byte & 0xfc) == 0xfc) { |
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window->phys = 0xffd00000; |
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} |
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else if ((byte & 0xf8) == 0xf8) { |
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window->phys = 0xffd80000; |
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} |
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else if ((byte & 0xf0) == 0xf0) { |
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window->phys = 0xffe00000; |
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} |
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else if ((byte & 0xe0) == 0xe0) { |
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window->phys = 0xffe80000; |
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} |
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else if ((byte & 0xc0) == 0xc0) { |
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window->phys = 0xfff00000; |
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} |
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else if ((byte & 0x80) == 0x80) { |
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window->phys = 0xfff80000; |
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} |
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if (window->phys == 0) { |
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printk(KERN_ERR MOD_NAME ": Rom window is closed\n"); |
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goto out; |
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} |
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window->phys -= 0x400000UL; |
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window->size = (0xffffffffUL - window->phys) + 1UL; |
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/* Enable writes through the rom window */ |
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pci_read_config_word(pdev, BIOS_CNTL, &word); |
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if (!(word & 1) && (word & (1<<1))) { |
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/* The BIOS will generate an error if I enable |
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* this device, so don't even try. |
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*/ |
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printk(KERN_ERR MOD_NAME ": firmware access control, I can't enable writes\n"); |
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goto out; |
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} |
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pci_write_config_word(pdev, BIOS_CNTL, word | 1); |
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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 the window being "reserved" by the BIOS. |
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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_DEBUG 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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} |
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/* Map the firmware hub into my address space. */ |
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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 ((window->phys & 0x3fffff) != 0) { |
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map_top = window->phys + 0x400000; |
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} |
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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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/* Firmware hubs only use vpp when being programmed |
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* in a factory setting. So in-place programming |
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* needs to use a different method. |
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*/ |
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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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ichxrom_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 ichxrom_remove_one(struct pci_dev *pdev) |
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{ |
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struct ichxrom_window *window = &ichxrom_window; |
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ichxrom_cleanup(window); |
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} |
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static const struct pci_device_id ichxrom_pci_tbl[] = { |
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{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, |
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PCI_ANY_ID, PCI_ANY_ID, }, |
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{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0, |
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PCI_ANY_ID, PCI_ANY_ID, }, |
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{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, |
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PCI_ANY_ID, PCI_ANY_ID, }, |
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{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, |
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PCI_ANY_ID, PCI_ANY_ID, }, |
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{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1, |
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PCI_ANY_ID, PCI_ANY_ID, }, |
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{ 0, }, |
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}; |
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#if 0 |
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MODULE_DEVICE_TABLE(pci, ichxrom_pci_tbl); |
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static struct pci_driver ichxrom_driver = { |
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.name = MOD_NAME, |
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.id_table = ichxrom_pci_tbl, |
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.probe = ichxrom_init_one, |
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.remove = ichxrom_remove_one, |
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}; |
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#endif |
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static int __init init_ichxrom(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 = ichxrom_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 ichxrom_init_one(pdev, &ichxrom_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(&ichxrom_driver); |
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#endif |
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} |
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static void __exit cleanup_ichxrom(void) |
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{ |
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ichxrom_remove_one(ichxrom_window.pdev); |
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} |
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module_init(init_ichxrom); |
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module_exit(cleanup_ichxrom); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Eric Biederman <[email protected]>"); |
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MODULE_DESCRIPTION("MTD map driver for BIOS chips on the ICHX southbridge");
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