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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mtd/maps/ichxrom.c
downloadlinaro-lsk-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/mtd/maps/ichxrom.c')
-rw-r--r--drivers/mtd/maps/ichxrom.c383
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 00000000000..29d1cc1bb42
--- /dev/null
+++ b/drivers/mtd/maps/ichxrom.c
@@ -0,0 +1,383 @@
+/*
+ * ichxrom.c
+ *
+ * Normal mappings of chips in physical memory
+ * $Id: ichxrom.c,v 1.16 2004/11/28 09:40:39 dwmw2 Exp $
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.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/config.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;
+
+ /* Disable writes through the rom window */
+ pci_read_config_word(window->pdev, BIOS_CNTL, &word);
+ pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1);
+
+ /* Free all of the mtd devices */
+ list_for_each_entry_safe(map, scratch, &window->maps, list) {
+ if (map->rsrc.parent)
+ release_resource(&map->rsrc);
+ del_mtd_device(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 __devinit 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 "reseved" 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"
+ " 0x%.08lx-0x%.08lx - kernel bug?\n",
+ __func__,
+ window->rsrc.start, window->rsrc.end);
+ }
+
+ /* Map the firmware hub into my address space. */
+ window->virt = ioremap_nocache(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, 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(%u) larger than window(%lu). fixing...\n",
+ 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 (add_mtd_device(map->mtd)) {
+ 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 */
+ if (map) {
+ kfree(map);
+ }
+ /* See if I have any map structures */
+ if (list_empty(&window->maps)) {
+ ichxrom_cleanup(window);
+ return -ENODEV;
+ }
+ return 0;
+}
+
+
+static void __devexit ichxrom_remove_one (struct pci_dev *pdev)
+{
+ struct ichxrom_window *window = &ichxrom_window;
+ ichxrom_cleanup(window);
+}
+
+static struct pci_device_id ichxrom_pci_tbl[] __devinitdata = {
+ { 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, },
+};
+
+MODULE_DEVICE_TABLE(pci, ichxrom_pci_tbl);
+
+#if 0
+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;
+ struct pci_device_id *id;
+
+ pdev = NULL;
+ for (id = ichxrom_pci_tbl; id->vendor; id++) {
+ pdev = pci_find_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_module_init(&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");