summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/mtd/chips/gen_probe.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/drivers/mtd/chips/gen_probe.c')
-rw-r--r--kernel/drivers/mtd/chips/gen_probe.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/kernel/drivers/mtd/chips/gen_probe.c b/kernel/drivers/mtd/chips/gen_probe.c
new file mode 100644
index 000000000..b57ceea21
--- /dev/null
+++ b/kernel/drivers/mtd/chips/gen_probe.c
@@ -0,0 +1,264 @@
+/*
+ * Routines common to all CFI-type probes.
+ * (C) 2001-2003 Red Hat, Inc.
+ * GPL'd
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/cfi.h>
+#include <linux/mtd/gen_probe.h>
+
+static struct mtd_info *check_cmd_set(struct map_info *, int);
+static struct cfi_private *genprobe_ident_chips(struct map_info *map,
+ struct chip_probe *cp);
+static int genprobe_new_chip(struct map_info *map, struct chip_probe *cp,
+ struct cfi_private *cfi);
+
+struct mtd_info *mtd_do_chip_probe(struct map_info *map, struct chip_probe *cp)
+{
+ struct mtd_info *mtd = NULL;
+ struct cfi_private *cfi;
+
+ /* First probe the map to see if we have CFI stuff there. */
+ cfi = genprobe_ident_chips(map, cp);
+
+ if (!cfi)
+ return NULL;
+
+ map->fldrv_priv = cfi;
+ /* OK we liked it. Now find a driver for the command set it talks */
+
+ mtd = check_cmd_set(map, 1); /* First the primary cmdset */
+ if (!mtd)
+ mtd = check_cmd_set(map, 0); /* Then the secondary */
+
+ if (mtd) {
+ if (mtd->size > map->size) {
+ printk(KERN_WARNING "Reducing visibility of %ldKiB chip to %ldKiB\n",
+ (unsigned long)mtd->size >> 10,
+ (unsigned long)map->size >> 10);
+ mtd->size = map->size;
+ }
+ return mtd;
+ }
+
+ printk(KERN_WARNING"gen_probe: No supported Vendor Command Set found\n");
+
+ kfree(cfi->cfiq);
+ kfree(cfi);
+ map->fldrv_priv = NULL;
+ return NULL;
+}
+EXPORT_SYMBOL(mtd_do_chip_probe);
+
+
+static struct cfi_private *genprobe_ident_chips(struct map_info *map, struct chip_probe *cp)
+{
+ struct cfi_private cfi;
+ struct cfi_private *retcfi;
+ unsigned long *chip_map;
+ int i, j, mapsize;
+ int max_chips;
+
+ memset(&cfi, 0, sizeof(cfi));
+
+ /* Call the probetype-specific code with all permutations of
+ interleave and device type, etc. */
+ if (!genprobe_new_chip(map, cp, &cfi)) {
+ /* The probe didn't like it */
+ pr_debug("%s: Found no %s device at location zero\n",
+ cp->name, map->name);
+ return NULL;
+ }
+
+#if 0 /* Let the CFI probe routine do this sanity check. The Intel and AMD
+ probe routines won't ever return a broken CFI structure anyway,
+ because they make them up themselves.
+ */
+ if (cfi.cfiq->NumEraseRegions == 0) {
+ printk(KERN_WARNING "Number of erase regions is zero\n");
+ kfree(cfi.cfiq);
+ return NULL;
+ }
+#endif
+ cfi.chipshift = cfi.cfiq->DevSize;
+
+ if (cfi_interleave_is_1(&cfi)) {
+ ;
+ } else if (cfi_interleave_is_2(&cfi)) {
+ cfi.chipshift++;
+ } else if (cfi_interleave_is_4((&cfi))) {
+ cfi.chipshift += 2;
+ } else if (cfi_interleave_is_8(&cfi)) {
+ cfi.chipshift += 3;
+ } else {
+ BUG();
+ }
+
+ cfi.numchips = 1;
+
+ /*
+ * Allocate memory for bitmap of valid chips.
+ * Align bitmap storage size to full byte.
+ */
+ max_chips = map->size >> cfi.chipshift;
+ if (!max_chips) {
+ printk(KERN_WARNING "NOR chip too large to fit in mapping. Attempting to cope...\n");
+ max_chips = 1;
+ }
+
+ mapsize = sizeof(long) * DIV_ROUND_UP(max_chips, BITS_PER_LONG);
+ chip_map = kzalloc(mapsize, GFP_KERNEL);
+ if (!chip_map) {
+ kfree(cfi.cfiq);
+ return NULL;
+ }
+
+ set_bit(0, chip_map); /* Mark first chip valid */
+
+ /*
+ * Now probe for other chips, checking sensibly for aliases while
+ * we're at it. The new_chip probe above should have let the first
+ * chip in read mode.
+ */
+
+ for (i = 1; i < max_chips; i++) {
+ cp->probe_chip(map, i << cfi.chipshift, chip_map, &cfi);
+ }
+
+ /*
+ * Now allocate the space for the structures we need to return to
+ * our caller, and copy the appropriate data into them.
+ */
+
+ retcfi = kmalloc(sizeof(struct cfi_private) + cfi.numchips * sizeof(struct flchip), GFP_KERNEL);
+
+ if (!retcfi) {
+ kfree(cfi.cfiq);
+ kfree(chip_map);
+ return NULL;
+ }
+
+ memcpy(retcfi, &cfi, sizeof(cfi));
+ memset(&retcfi->chips[0], 0, sizeof(struct flchip) * cfi.numchips);
+
+ for (i = 0, j = 0; (j < cfi.numchips) && (i < max_chips); i++) {
+ if(test_bit(i, chip_map)) {
+ struct flchip *pchip = &retcfi->chips[j++];
+
+ pchip->start = (i << cfi.chipshift);
+ pchip->state = FL_READY;
+ init_waitqueue_head(&pchip->wq);
+ mutex_init(&pchip->mutex);
+ }
+ }
+
+ kfree(chip_map);
+ return retcfi;
+}
+
+
+static int genprobe_new_chip(struct map_info *map, struct chip_probe *cp,
+ struct cfi_private *cfi)
+{
+ int min_chips = (map_bankwidth(map)/4?:1); /* At most 4-bytes wide. */
+ int max_chips = map_bankwidth(map); /* And minimum 1 */
+ int nr_chips, type;
+
+ for (nr_chips = max_chips; nr_chips >= min_chips; nr_chips >>= 1) {
+
+ if (!cfi_interleave_supported(nr_chips))
+ continue;
+
+ cfi->interleave = nr_chips;
+
+ /* Minimum device size. Don't look for one 8-bit device
+ in a 16-bit bus, etc. */
+ type = map_bankwidth(map) / nr_chips;
+
+ for (; type <= CFI_DEVICETYPE_X32; type<<=1) {
+ cfi->device_type = type;
+
+ if (cp->probe_chip(map, 0, NULL, cfi))
+ return 1;
+ }
+ }
+ return 0;
+}
+
+typedef struct mtd_info *cfi_cmdset_fn_t(struct map_info *, int);
+
+extern cfi_cmdset_fn_t cfi_cmdset_0001;
+extern cfi_cmdset_fn_t cfi_cmdset_0002;
+extern cfi_cmdset_fn_t cfi_cmdset_0020;
+
+static inline struct mtd_info *cfi_cmdset_unknown(struct map_info *map,
+ int primary)
+{
+ struct cfi_private *cfi = map->fldrv_priv;
+ __u16 type = primary?cfi->cfiq->P_ID:cfi->cfiq->A_ID;
+#ifdef CONFIG_MODULES
+ char probename[sizeof(VMLINUX_SYMBOL_STR(cfi_cmdset_%4.4X))];
+ cfi_cmdset_fn_t *probe_function;
+
+ sprintf(probename, VMLINUX_SYMBOL_STR(cfi_cmdset_%4.4X), type);
+
+ probe_function = __symbol_get(probename);
+ if (!probe_function) {
+ request_module("cfi_cmdset_%4.4X", type);
+ probe_function = __symbol_get(probename);
+ }
+
+ if (probe_function) {
+ struct mtd_info *mtd;
+
+ mtd = (*probe_function)(map, primary);
+ /* If it was happy, it'll have increased its own use count */
+ symbol_put_addr(probe_function);
+ return mtd;
+ }
+#endif
+ printk(KERN_NOTICE "Support for command set %04X not present\n", type);
+
+ return NULL;
+}
+
+static struct mtd_info *check_cmd_set(struct map_info *map, int primary)
+{
+ struct cfi_private *cfi = map->fldrv_priv;
+ __u16 type = primary?cfi->cfiq->P_ID:cfi->cfiq->A_ID;
+
+ if (type == P_ID_NONE || type == P_ID_RESERVED)
+ return NULL;
+
+ switch(type){
+ /* We need these for the !CONFIG_MODULES case,
+ because symbol_get() doesn't work there */
+#ifdef CONFIG_MTD_CFI_INTELEXT
+ case P_ID_INTEL_EXT:
+ case P_ID_INTEL_STD:
+ case P_ID_INTEL_PERFORMANCE:
+ return cfi_cmdset_0001(map, primary);
+#endif
+#ifdef CONFIG_MTD_CFI_AMDSTD
+ case P_ID_AMD_STD:
+ case P_ID_SST_OLD:
+ case P_ID_WINBOND:
+ return cfi_cmdset_0002(map, primary);
+#endif
+#ifdef CONFIG_MTD_CFI_STAA
+ case P_ID_ST_ADV:
+ return cfi_cmdset_0020(map, primary);
+#endif
+ default:
+ return cfi_cmdset_unknown(map, primary);
+ }
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("Helper routines for flash chip probe code");