/* vivi/drivers/mtd/cfi-probe.c: Common Flash Interface probe code. * * Based on linux/drivers/mtd/chips/cfi_probe.c * * $Id: cfi_probe.c,v 1.3 2002/08/10 07:47:08 nandy Exp $ * */#include "config.h"#include "mtd/map.h"#include "mtd/cfi.h"#include "mtd/gen_probe.h"#include "heap.h"#include "printk.h"#include <types.h>#include <errno.h>#ifdef CONFIG_DEBUG_CFIstatic void print_cfi_ident(struct cfi_ident *);#endifstatic int cfi_probe_chip(struct map_info *map, __u32 base,                          struct flchip *chips, 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);/* * check for QRY. * in: interleave, type, mode * ret: table index, < 0 for error */static inline int qry_present(struct map_info *map, __u32 base,                               struct cfi_private *cfi){	int osf = cfi->interleave * cfi->device_type;	/* scale factor */   	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 */	return 0;	/* nothing found */}static int cfi_probe_chip(struct map_info *map, __u32 base,                          struct flchip *chips, struct cfi_private *cfi){	int i;	if ((base + 0) >= map->size) {		printk("Probe at base[0x00](0x%08lx) past the end of map(0x%08lx)\n",			(unsigned long)base, map->size - 1);		return 0;	}	if ((base + 0xff) >= map->size) {		printk("Probe at base[0x55](0x%08lx) past the end of the map(0x%08lx)\n",			(unsigned long)base + 0x55, map->size - 1);		return 0;	}	cfi_send_gen_cmd(0xf0, 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)) {    printk("qry_present() return 0\n");    return 0;    }	if (!cfi->numchips) {		/* 		 * This is the first time we're called. Set up the CFI		 * stuff accordingly and return 		 */		return cfi_chip_setup(map, cfi);	}	/* Check each previous chip to see if it's an alias */	for (i = 0; i < cfi->numchips; i++) {		/* This chip should be in read mode if it's one		 * we've alread touched. */		if (qry_present(map, chips[i].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);			/* If the QRY marker goes away, it's an alias */			if (!qry_present(map, chips[i].start, cfi)) {				printk("%s: Found an alias at 0x%x for the chip at 0x%lx\n", 					map->name, base, chips[i].start);				return 0;			}			/* Yes, it's actually got QRY for data. Most			 * unfortunate. Stick the new chip in read mode			 * too end 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);			if (qry_present(map, base, cfi)) {				printk("%s: Found an alias at 0x%x for the chip at 0x%lx\n",					map->name, base, chips[i].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("%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 anyway */		return -1;	}	chips[cfi->numchips].start = base;	cfi->numchips++;	/* Put it back into Read Mode */	cfi_send_gen_cmd(0xf0, 0, base, map, cfi, cfi->device_type, NULL);	printk("%s: Found %d x%d devices at 0x%x in %d-bit mode\n",		map->name, cfi->interleave, cfi->device_type*8, base,		map->buswidth*8);	return 1;}static int 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;#ifdef CONFIG_DEBUG_CFI	printk("Number of erase regions: %d\n", num_erase_regions);#endif	if (!num_erase_regions)		return 0;	cfi->cfiq = mmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4);	if (!cfi->cfiq) {		printk("%s: mmalloc failed for CFI ident structure\n", map->name);		return 0;	}	memset(cfi->cfiq, 0, sizeof(struct cfi_ident));	/* Read the CFI info structure */	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);	}#ifdef CONFIG_DEBUG_CFI	/* Dump the information therin */	print_cfi_ident(cfi->cfiq);#endif	for (i = 0; i < cfi->cfiq->NumEraseRegions; i++) {		cfi->cfiq->EraseRegionInfo[i] = cfi->cfiq->EraseRegionInfo[i];#ifdef CONFIG_DEBUG_CFI		printk("  erase Region #%d: BlockSize 0x%4.4x bytes, %d blocks\n",			i, (cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff,			(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);	return 1;}#ifdef CONFIG_DEBUG_CFIstatic char *vendorname(__u16 vendor) {        switch (vendor) {        case P_ID_NONE:                return "None";                  case P_ID_INTEL_EXT:                return "Intel/Sharp Extended";                 case P_ID_AMD_STD:                return "AMD/Fujitsu Standard";                 case P_ID_INTEL_STD:                return "Intel/Sharp Standard";                 case P_ID_AMD_EXT:                return "AMD/Fujitsu Extended";                 case P_ID_MITSUBISHI_STD:                return "Mitsubishi Standard";                 case P_ID_MITSUBISHI_EXT:                return "Mitsubishi Extended";                 case P_ID_RESERVED:                return "Not Allowed / Reserved for Future Use";                 default:                return "Unknown";        }}static void print_cfi_ident(struct cfi_ident *cfip){#if 0        if (cfip->qry[0] != 'Q' || cfip->qry[1] != 'R' || cfip->qry[2] != 'Y') {                printk("Invalid CFI ident structure.\n");                return;        }       #endif                  printk("Primary Vendor Command Set: %4.4X (%s)\n", cfip->P_ID, vendorname(cfip->P_ID));        if (cfip->P_ADR)                printk("Primary Algorithm Table at %4.4X\n", cfip->P_ADR);        else                printk("No Primary Algorithm Table\n");                printk("Alternative Vendor Command Set: %4.4X (%s)\n", cfip->A_ID, vendorname(cfip->A_ID));        if (cfip->A_ADR)                printk("Alternate Algorithm Table at %4.4X\n", cfip->A_ADR);        else                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);        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);        }        else                printk("No Vpp line\n");        printk("Typical byte/word write timeout: %d us\n", 1<<cfip->WordWriteTimeoutTyp);        printk("Maximum byte/word write timeout: %d us\n", (1<<cfip->WordWriteTimeoutMax) * (1<<cfip->WordWriteTimeoutTyp));        if (cfip->BufWriteTimeoutTyp || cfip->BufWriteTimeoutMax) {                printk("Typical full buffer write timeout: %d us\n", 1<<cfip->BufWriteTimeoutTyp);                printk("Maximum full buffer write timeout: %d us\n", (1<<cfip->BufWriteTimeoutMax) * (1<<cfip->BufWriteTimeoutTyp));        }        else                printk("Full buffer write not supported\n");        printk("Typical block erase timeout: %d us\n", 1<<cfip->BlockEraseTimeoutTyp);        printk("Maximum block erase timeout: %d us\n", (1<<cfip->BlockEraseTimeoutMax) * (1<<cfip->BlockEraseTimeoutTyp));        if (cfip->ChipEraseTimeoutTyp || cfip->ChipEraseTimeoutMax) {                printk("Typical chip erase timeout: %d us\n", 1<<cfip->ChipEraseTimeoutTyp);                printk("Maximum chip erase timeout: %d us\n", (1<<cfip->ChipEraseTimeoutMax) * (1<<cfip->ChipEraseTimeoutTyp));        }        else                printk("Chip erase not supported\n");        printk("Device size: 0x%X bytes (%d MiB)\n", 1 << cfip->DevSize, 1<< (cfip->DevSize - 20));        printk("Flash Device Interface description: 0x%4.4X\n", cfip->InterfaceDesc);        switch(cfip->InterfaceDesc) {        case 0:                printk("  - x8-only asynchronous interface\n");                break;        case 1:                printk("  - x16-only asynchronous interface\n");                break;        case 2:                printk("  - supports x8 and x16 via BYTE# with asynchronous interface\n");                break;        case 3:                printk("  - x32-only asynchronous interface\n");                break;        case 65535:                printk("  - Not Allowed / Reserved\n");                break;        default:                printk("  - Unknown\n");                break;        }        printk("Max. bytes in buffer write: 0x%x\n", 1<< cfip->MaxBufWriteSize);        printk("Number of Erase Block Regions: %d\n", cfip->NumEraseRegions);}#endif /* CONFIG_DEBUG_CFI */static struct chip_probe cfi_chip_probe = {	name: "CFI",	probe_chip: cfi_probe_chip};struct mtd_info *cfi_probe(struct map_info *map){	/*	 * Just use the generic probe stuff to call our CFI-specific	 * chip_probe routine in all the possible permutations, etc.	 */	return mtd_do_chip_probe(map, &cfi_chip_probe);}