/*
Common Flash Interface probe code.
(C) 2000 Red Hat. GPL'd.
- $Id: cfi_probe.c,v 1.71 2003/05/28 12:51:48 dwmw2 Exp $
+ $Id: cfi_probe.c,v 1.83 2004/11/16 18:19:02 nico Exp $
*/
#include <linux/config.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
+#include <linux/mtd/xip.h>
#include <linux/mtd/map.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/gen_probe.h>
#endif
static int cfi_probe_chip(struct map_info *map, __u32 base,
- struct flchip *chips, struct cfi_private *cfi);
+ unsigned long *chip_map, struct cfi_private *cfi);
static int cfi_chip_setup(struct map_info *map, struct cfi_private *cfi);
struct mtd_info *cfi_probe(struct map_info *map);
+#ifdef CONFIG_MTD_XIP
+
+/* only needed for short periods, so this is rather simple */
+#define xip_disable() local_irq_disable()
+
+#define xip_allowed(base, map) \
+do { \
+ (void) map_read(map, base); \
+ asm volatile (".rep 8; nop; .endr"); \
+ local_irq_enable(); \
+} while (0)
+
+#define xip_enable(base, map, cfi) \
+do { \
+ cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); \
+ cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); \
+ xip_allowed(base, map); \
+} while (0)
+
+#define xip_disable_qry(base, map, cfi) \
+do { \
+ xip_disable(); \
+ cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); \
+ cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); \
+ cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL); \
+} while (0)
+
+#else
+
+#define xip_disable() do { } while (0)
+#define xip_allowed(base, map) do { } while (0)
+#define xip_enable(base, map, cfi) do { } while (0)
+#define xip_disable_qry(base, map, cfi) do { } while (0)
+
+#endif
+
/* check for QRY.
in: interleave,type,mode
ret: table index, <0 for error
*/
-static inline int qry_present(struct map_info *map, __u32 base,
+static int __xipram qry_present(struct map_info *map, __u32 base,
struct cfi_private *cfi)
{
int osf = cfi->interleave * cfi->device_type; // scale factor
+ map_word val[3];
+ map_word qry[3];
- if (cfi_read(map,base+osf*0x10)==cfi_build_cmd('Q',map,cfi) &&
- cfi_read(map,base+osf*0x11)==cfi_build_cmd('R',map,cfi) &&
- cfi_read(map,base+osf*0x12)==cfi_build_cmd('Y',map,cfi))
- return 1; // ok !
+ qry[0] = cfi_build_cmd('Q', map, cfi);
+ qry[1] = cfi_build_cmd('R', map, cfi);
+ qry[2] = cfi_build_cmd('Y', map, cfi);
- return 0; // nothing found
+ val[0] = map_read(map, base + osf*0x10);
+ val[1] = map_read(map, base + osf*0x11);
+ val[2] = map_read(map, base + osf*0x12);
+
+ if (!map_word_equal(map, qry[0], val[0]))
+ return 0;
+
+ if (!map_word_equal(map, qry[1], val[1]))
+ return 0;
+
+ if (!map_word_equal(map, qry[2], val[2]))
+ return 0;
+
+ return 1; // "QRY" found
}
-static int cfi_probe_chip(struct map_info *map, __u32 base,
- struct flchip *chips, struct cfi_private *cfi)
+static int __xipram cfi_probe_chip(struct map_info *map, __u32 base,
+ unsigned long *chip_map, struct cfi_private *cfi)
{
int i;
(unsigned long)base + 0x55, map->size -1);
return 0;
}
+
+ xip_disable();
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
- if (!qry_present(map,base,cfi))
+ if (!qry_present(map,base,cfi)) {
+ xip_enable(base, map, cfi);
return 0;
+ }
if (!cfi->numchips) {
/* This is the first time we're called. Set up the CFI
}
/* Check each previous chip to see if it's an alias */
- for (i=0; i<cfi->numchips; i++) {
+ for (i=0; i < (base >> cfi->chipshift); i++) {
+ unsigned long start;
+ if(!test_bit(i, chip_map)) {
+ /* Skip location; no valid chip at this address */
+ continue;
+ }
+ start = i << cfi->chipshift;
/* This chip should be in read mode if it's one
we've already touched. */
- if (qry_present(map,chips[i].start,cfi)) {
+ if (qry_present(map, start, cfi)) {
/* Eep. This chip also had the QRY marker.
* Is it an alias for the new one? */
- cfi_send_gen_cmd(0xF0, 0, chips[i].start, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0xF0, 0, start, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0xFF, 0, start, map, cfi, cfi->device_type, NULL);
/* If the QRY marker goes away, it's an alias */
- if (!qry_present(map, chips[i].start, cfi)) {
+ if (!qry_present(map, start, cfi)) {
+ xip_allowed(base, map);
printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
- map->name, base, chips[i].start);
+ map->name, base, start);
return 0;
}
/* Yes, it's actually got QRY for data. Most
* too and if it's the same, assume it's an alias. */
/* FIXME: Use other modes to do a proper check */
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0xFF, 0, start, map, cfi, cfi->device_type, NULL);
if (qry_present(map, base, cfi)) {
+ xip_allowed(base, map);
printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
- map->name, base, chips[i].start);
+ map->name, base, start);
return 0;
}
}
/* OK, if we got to here, then none of the previous chips appear to
be aliases for the current one. */
- if (cfi->numchips == MAX_CFI_CHIPS) {
- printk(KERN_WARNING"%s: Too many flash chips detected. Increase MAX_CFI_CHIPS from %d.\n", map->name, MAX_CFI_CHIPS);
- /* Doesn't matter about resetting it to Read Mode - we're not going to talk to it anyway */
- return -1;
- }
- chips[cfi->numchips].start = base;
- chips[cfi->numchips].state = FL_READY;
+ set_bit((base >> cfi->chipshift), chip_map); /* Update chip map */
cfi->numchips++;
/* Put it back into Read Mode */
cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
+ xip_allowed(base, map);
- printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit mode\n",
+ printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
map->name, cfi->interleave, cfi->device_type*8, base,
- map->buswidth*8);
+ map->bankwidth*8);
return 1;
}
-static int cfi_chip_setup(struct map_info *map,
- struct cfi_private *cfi)
+static int __xipram cfi_chip_setup(struct map_info *map,
+ struct cfi_private *cfi)
{
int ofs_factor = cfi->interleave*cfi->device_type;
__u32 base = 0;
int num_erase_regions = cfi_read_query(map, base + (0x10 + 28)*ofs_factor);
int i;
+ xip_enable(base, map, cfi);
#ifdef DEBUG_CFI
printk("Number of erase regions: %d\n", num_erase_regions);
#endif
memset(cfi->cfiq,0,sizeof(struct cfi_ident));
cfi->cfi_mode = CFI_MODE_CFI;
- cfi->fast_prog=1; /* CFI supports fast programming */
/* Read the CFI info structure */
- for (i=0; i<(sizeof(struct cfi_ident) + num_erase_regions * 4); i++) {
+ xip_disable_qry(base, map, cfi);
+ for (i=0; i<(sizeof(struct cfi_ident) + num_erase_regions * 4); i++)
((unsigned char *)cfi->cfiq)[i] = cfi_read_query(map,base + (0x10 + i)*ofs_factor);
- }
-
+
+ /* Note we put the device back into Read Mode BEFORE going into Auto
+ * Select Mode, as some devices support nesting of modes, others
+ * don't. This way should always work.
+ * On cmdset 0001 the writes of 0xaa and 0x55 are not needed, and
+ * so should be treated as nops or illegal (and so put the device
+ * back into Read Mode, which is a nop in this case).
+ */
+ cfi_send_gen_cmd(0xf0, 0, base, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0xaa, 0x555, base, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0x55, 0x2aa, base, map, cfi, cfi->device_type, NULL);
+ cfi_send_gen_cmd(0x90, 0x555, base, map, cfi, cfi->device_type, NULL);
+ cfi->mfr = cfi_read_query(map, base);
+ cfi->id = cfi_read_query(map, base + ofs_factor);
+
+ /* Put it back into Read Mode */
+ cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
+ /* ... even if it's an Intel chip */
+ cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
+ xip_allowed(base, map);
+
/* Do any necessary byteswapping */
cfi->cfiq->P_ID = le16_to_cpu(cfi->cfiq->P_ID);
-
+
cfi->cfiq->P_ADR = le16_to_cpu(cfi->cfiq->P_ADR);
cfi->cfiq->A_ID = le16_to_cpu(cfi->cfiq->A_ID);
cfi->cfiq->A_ADR = le16_to_cpu(cfi->cfiq->A_ADR);
(cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1);
#endif
}
- /* Put it back into Read Mode */
- cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
+
+ printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
+ map->name, cfi->interleave, cfi->device_type*8, base,
+ map->bankwidth*8);
return 1;
}
case P_ID_AMD_EXT:
return "AMD/Fujitsu Extended";
+
+ case P_ID_WINBOND:
+ return "Winbond Standard";
+ case P_ID_ST_ADV:
+ return "ST Advanced";
+
case P_ID_MITSUBISHI_STD:
return "Mitsubishi Standard";
case P_ID_MITSUBISHI_EXT:
return "Mitsubishi Extended";
+
+ case P_ID_SST_PAGE:
+ return "SST Page Write";
+
+ case P_ID_INTEL_PERFORMANCE:
+ return "Intel Performance Code";
+
+ case P_ID_INTEL_DATA:
+ return "Intel Data";
case P_ID_RESERVED:
return "Not Allowed / Reserved for Future Use";
printk("No Alternate Algorithm Table\n");
- printk("Vcc Minimum: %x.%x V\n", cfip->VccMin >> 4, cfip->VccMin & 0xf);
- printk("Vcc Maximum: %x.%x V\n", cfip->VccMax >> 4, cfip->VccMax & 0xf);
+ printk("Vcc Minimum: %2d.%d V\n", cfip->VccMin >> 4, cfip->VccMin & 0xf);
+ printk("Vcc Maximum: %2d.%d V\n", cfip->VccMax >> 4, cfip->VccMax & 0xf);
if (cfip->VppMin) {
- printk("Vpp Minimum: %x.%x V\n", cfip->VppMin >> 4, cfip->VppMin & 0xf);
- printk("Vpp Maximum: %x.%x V\n", cfip->VppMax >> 4, cfip->VppMax & 0xf);
+ printk("Vpp Minimum: %2d.%d V\n", cfip->VppMin >> 4, cfip->VppMin & 0xf);
+ printk("Vpp Maximum: %2d.%d V\n", cfip->VppMax >> 4, cfip->VppMax & 0xf);
}
else
printk("No Vpp line\n");
printk(" - x32-only asynchronous interface\n");
break;
+ case 4:
+ printk(" - supports x16 and x32 via Word# with asynchronous interface\n");
+ break;
+
case 65535:
printk(" - Not Allowed / Reserved\n");
break;
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