| 1 |
1275 |
phoenix |
/*
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| 2 |
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Common Flash Interface probe code.
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(C) 2000 Red Hat. GPL'd.
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$Id: cfi_probe.c,v 1.1.1.1 2004-04-15 01:52:10 phoenix Exp $
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*/
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#include <linux/config.h>
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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 <asm/io.h>
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#include <asm/byteorder.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/interrupt.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/gen_probe.h>
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//#define DEBUG_CFI
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#ifdef DEBUG_CFI
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static void print_cfi_ident(struct cfi_ident *);
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#endif
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static int cfi_probe_chip(struct map_info *map, __u32 base,
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struct flchip *chips, struct cfi_private *cfi);
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static int cfi_chip_setup(struct map_info *map, struct cfi_private *cfi);
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struct mtd_info *cfi_probe(struct map_info *map);
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/* check for QRY.
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in: interleave,type,mode
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ret: table index, <0 for error
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*/
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static inline int qry_present(struct map_info *map, __u32 base,
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struct cfi_private *cfi)
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{
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int osf = cfi->interleave * cfi->device_type; // scale factor
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if (cfi_read(map,base+osf*0x10)==cfi_build_cmd('Q',map,cfi) &&
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cfi_read(map,base+osf*0x11)==cfi_build_cmd('R',map,cfi) &&
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cfi_read(map,base+osf*0x12)==cfi_build_cmd('Y',map,cfi))
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return 1; // ok !
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return 0; // nothing found
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}
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static int cfi_probe_chip(struct map_info *map, __u32 base,
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struct flchip *chips, struct cfi_private *cfi)
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{
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int i;
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if ((base + 0) >= map->size) {
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printk(KERN_NOTICE
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"Probe at base[0x00](0x%08lx) past the end of the map(0x%08lx)\n",
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(unsigned long)base, map->size -1);
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return 0;
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}
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if ((base + 0xff) >= map->size) {
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printk(KERN_NOTICE
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"Probe at base[0x55](0x%08lx) past the end of the map(0x%08lx)\n",
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(unsigned long)base + 0x55, map->size -1);
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return 0;
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}
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cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
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cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
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if (!qry_present(map,base,cfi))
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return 0;
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if (!cfi->numchips) {
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/* This is the first time we're called. Set up the CFI
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stuff accordingly and return */
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return cfi_chip_setup(map, cfi);
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}
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/* Check each previous chip to see if it's an alias */
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for (i=0; i<cfi->numchips; i++) {
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/* This chip should be in read mode if it's one
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we've already touched. */
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if (qry_present(map,chips[i].start,cfi)) {
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/* Eep. This chip also had the QRY marker.
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* Is it an alias for the new one? */
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cfi_send_gen_cmd(0xF0, 0, chips[i].start, map, cfi, cfi->device_type, NULL);
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/* If the QRY marker goes away, it's an alias */
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if (!qry_present(map, chips[i].start, cfi)) {
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printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
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map->name, base, chips[i].start);
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return 0;
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}
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/* Yes, it's actually got QRY for data. Most
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* unfortunate. Stick the new chip in read mode
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* too and if it's the same, assume it's an alias. */
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/* FIXME: Use other modes to do a proper check */
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cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
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if (qry_present(map, base, cfi)) {
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printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
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map->name, base, chips[i].start);
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return 0;
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}
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}
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}
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/* OK, if we got to here, then none of the previous chips appear to
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be aliases for the current one. */
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if (cfi->numchips == MAX_CFI_CHIPS) {
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printk(KERN_WARNING"%s: Too many flash chips detected. Increase MAX_CFI_CHIPS from %d.\n", map->name, MAX_CFI_CHIPS);
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/* Doesn't matter about resetting it to Read Mode - we're not going to talk to it anyway */
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return -1;
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}
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chips[cfi->numchips].start = base;
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chips[cfi->numchips].state = FL_READY;
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cfi->numchips++;
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/* Put it back into Read Mode */
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cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
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printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit mode\n",
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map->name, cfi->interleave, cfi->device_type*8, base,
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map->buswidth*8);
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| 126 |
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return 1;
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}
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| 128 |
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| 129 |
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static int cfi_chip_setup(struct map_info *map,
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struct cfi_private *cfi)
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{
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int ofs_factor = cfi->interleave*cfi->device_type;
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__u32 base = 0;
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int num_erase_regions = cfi_read_query(map, base + (0x10 + 28)*ofs_factor);
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int i;
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| 136 |
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| 137 |
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#ifdef DEBUG_CFI
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printk("Number of erase regions: %d\n", num_erase_regions);
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#endif
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if (!num_erase_regions)
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| 141 |
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return 0;
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| 142 |
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| 143 |
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cfi->cfiq = kmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4, GFP_KERNEL);
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| 144 |
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if (!cfi->cfiq) {
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printk(KERN_WARNING "%s: kmalloc failed for CFI ident structure\n", map->name);
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return 0;
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}
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memset(cfi->cfiq,0,sizeof(struct cfi_ident));
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cfi->cfi_mode = CFI_MODE_CFI;
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cfi->fast_prog=1; /* CFI supports fast programming */
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/* Read the CFI info structure */
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for (i=0; i<(sizeof(struct cfi_ident) + num_erase_regions * 4); i++) {
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((unsigned char *)cfi->cfiq)[i] = cfi_read_query(map,base + (0x10 + i)*ofs_factor);
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}
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/* Do any necessary byteswapping */
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cfi->cfiq->P_ID = le16_to_cpu(cfi->cfiq->P_ID);
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cfi->cfiq->P_ADR = le16_to_cpu(cfi->cfiq->P_ADR);
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cfi->cfiq->A_ID = le16_to_cpu(cfi->cfiq->A_ID);
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cfi->cfiq->A_ADR = le16_to_cpu(cfi->cfiq->A_ADR);
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cfi->cfiq->InterfaceDesc = le16_to_cpu(cfi->cfiq->InterfaceDesc);
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cfi->cfiq->MaxBufWriteSize = le16_to_cpu(cfi->cfiq->MaxBufWriteSize);
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| 168 |
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#ifdef DEBUG_CFI
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/* Dump the information therein */
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print_cfi_ident(cfi->cfiq);
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#endif
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| 173 |
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for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
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cfi->cfiq->EraseRegionInfo[i] = le32_to_cpu(cfi->cfiq->EraseRegionInfo[i]);
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| 175 |
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| 176 |
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#ifdef DEBUG_CFI
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printk(" Erase Region #%d: BlockSize 0x%4.4X bytes, %d blocks\n",
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| 178 |
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i, (cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff,
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| 179 |
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(cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1);
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| 180 |
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#endif
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| 181 |
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}
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| 182 |
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/* Put it back into Read Mode */
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| 183 |
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cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
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| 184 |
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| 185 |
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return 1;
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| 186 |
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}
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| 187 |
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| 188 |
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#ifdef DEBUG_CFI
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| 189 |
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static char *vendorname(__u16 vendor)
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| 190 |
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{
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| 191 |
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switch (vendor) {
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| 192 |
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case P_ID_NONE:
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| 193 |
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return "None";
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| 194 |
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| 195 |
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case P_ID_INTEL_EXT:
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| 196 |
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return "Intel/Sharp Extended";
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| 197 |
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| 198 |
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case P_ID_AMD_STD:
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| 199 |
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return "AMD/Fujitsu Standard";
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| 200 |
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| 201 |
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case P_ID_INTEL_STD:
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| 202 |
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return "Intel/Sharp Standard";
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| 203 |
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| 204 |
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case P_ID_AMD_EXT:
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| 205 |
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return "AMD/Fujitsu Extended";
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| 206 |
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| 207 |
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case P_ID_MITSUBISHI_STD:
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| 208 |
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return "Mitsubishi Standard";
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| 209 |
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| 210 |
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case P_ID_MITSUBISHI_EXT:
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| 211 |
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return "Mitsubishi Extended";
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| 212 |
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| 213 |
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case P_ID_RESERVED:
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| 214 |
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return "Not Allowed / Reserved for Future Use";
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| 215 |
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| 216 |
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default:
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| 217 |
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return "Unknown";
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| 218 |
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}
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| 219 |
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}
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| 220 |
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| 221 |
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| 222 |
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static void print_cfi_ident(struct cfi_ident *cfip)
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| 223 |
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{
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| 224 |
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#if 0
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| 225 |
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if (cfip->qry[0] != 'Q' || cfip->qry[1] != 'R' || cfip->qry[2] != 'Y') {
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| 226 |
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printk("Invalid CFI ident structure.\n");
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| 227 |
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return;
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| 228 |
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}
|
| 229 |
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#endif
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| 230 |
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printk("Primary Vendor Command Set: %4.4X (%s)\n", cfip->P_ID, vendorname(cfip->P_ID));
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| 231 |
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if (cfip->P_ADR)
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| 232 |
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printk("Primary Algorithm Table at %4.4X\n", cfip->P_ADR);
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| 233 |
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else
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| 234 |
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printk("No Primary Algorithm Table\n");
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| 235 |
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| 236 |
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printk("Alternative Vendor Command Set: %4.4X (%s)\n", cfip->A_ID, vendorname(cfip->A_ID));
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| 237 |
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if (cfip->A_ADR)
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| 238 |
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printk("Alternate Algorithm Table at %4.4X\n", cfip->A_ADR);
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| 239 |
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else
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| 240 |
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printk("No Alternate Algorithm Table\n");
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| 241 |
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| 242 |
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| 243 |
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printk("Vcc Minimum: %x.%x V\n", cfip->VccMin >> 4, cfip->VccMin & 0xf);
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| 244 |
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printk("Vcc Maximum: %x.%x V\n", cfip->VccMax >> 4, cfip->VccMax & 0xf);
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| 245 |
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if (cfip->VppMin) {
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| 246 |
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printk("Vpp Minimum: %x.%x V\n", cfip->VppMin >> 4, cfip->VppMin & 0xf);
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| 247 |
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printk("Vpp Maximum: %x.%x V\n", cfip->VppMax >> 4, cfip->VppMax & 0xf);
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| 248 |
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}
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| 249 |
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else
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| 250 |
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printk("No Vpp line\n");
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| 251 |
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| 252 |
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printk("Typical byte/word write timeout: %d µs\n", 1<<cfip->WordWriteTimeoutTyp);
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| 253 |
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printk("Maximum byte/word write timeout: %d µs\n", (1<<cfip->WordWriteTimeoutMax) * (1<<cfip->WordWriteTimeoutTyp));
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| 254 |
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| 255 |
|
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if (cfip->BufWriteTimeoutTyp || cfip->BufWriteTimeoutMax) {
|
| 256 |
|
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printk("Typical full buffer write timeout: %d µs\n", 1<<cfip->BufWriteTimeoutTyp);
|
| 257 |
|
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printk("Maximum full buffer write timeout: %d µs\n", (1<<cfip->BufWriteTimeoutMax) * (1<<cfip->BufWriteTimeoutTyp));
|
| 258 |
|
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}
|
| 259 |
|
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else
|
| 260 |
|
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printk("Full buffer write not supported\n");
|
| 261 |
|
|
|
| 262 |
|
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printk("Typical block erase timeout: %d ms\n", 1<<cfip->BlockEraseTimeoutTyp);
|
| 263 |
|
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printk("Maximum block erase timeout: %d ms\n", (1<<cfip->BlockEraseTimeoutMax) * (1<<cfip->BlockEraseTimeoutTyp));
|
| 264 |
|
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if (cfip->ChipEraseTimeoutTyp || cfip->ChipEraseTimeoutMax) {
|
| 265 |
|
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printk("Typical chip erase timeout: %d ms\n", 1<<cfip->ChipEraseTimeoutTyp);
|
| 266 |
|
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printk("Maximum chip erase timeout: %d ms\n", (1<<cfip->ChipEraseTimeoutMax) * (1<<cfip->ChipEraseTimeoutTyp));
|
| 267 |
|
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}
|
| 268 |
|
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else
|
| 269 |
|
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printk("Chip erase not supported\n");
|
| 270 |
|
|
|
| 271 |
|
|
printk("Device size: 0x%X bytes (%d MiB)\n", 1 << cfip->DevSize, 1<< (cfip->DevSize - 20));
|
| 272 |
|
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printk("Flash Device Interface description: 0x%4.4X\n", cfip->InterfaceDesc);
|
| 273 |
|
|
switch(cfip->InterfaceDesc) {
|
| 274 |
|
|
case 0:
|
| 275 |
|
|
printk(" - x8-only asynchronous interface\n");
|
| 276 |
|
|
break;
|
| 277 |
|
|
|
| 278 |
|
|
case 1:
|
| 279 |
|
|
printk(" - x16-only asynchronous interface\n");
|
| 280 |
|
|
break;
|
| 281 |
|
|
|
| 282 |
|
|
case 2:
|
| 283 |
|
|
printk(" - supports x8 and x16 via BYTE# with asynchronous interface\n");
|
| 284 |
|
|
break;
|
| 285 |
|
|
|
| 286 |
|
|
case 3:
|
| 287 |
|
|
printk(" - x32-only asynchronous interface\n");
|
| 288 |
|
|
break;
|
| 289 |
|
|
|
| 290 |
|
|
case 65535:
|
| 291 |
|
|
printk(" - Not Allowed / Reserved\n");
|
| 292 |
|
|
break;
|
| 293 |
|
|
|
| 294 |
|
|
default:
|
| 295 |
|
|
printk(" - Unknown\n");
|
| 296 |
|
|
break;
|
| 297 |
|
|
}
|
| 298 |
|
|
|
| 299 |
|
|
printk("Max. bytes in buffer write: 0x%x\n", 1<< cfip->MaxBufWriteSize);
|
| 300 |
|
|
printk("Number of Erase Block Regions: %d\n", cfip->NumEraseRegions);
|
| 301 |
|
|
|
| 302 |
|
|
}
|
| 303 |
|
|
#endif /* DEBUG_CFI */
|
| 304 |
|
|
|
| 305 |
|
|
static struct chip_probe cfi_chip_probe = {
|
| 306 |
|
|
name: "CFI",
|
| 307 |
|
|
probe_chip: cfi_probe_chip
|
| 308 |
|
|
};
|
| 309 |
|
|
|
| 310 |
|
|
struct mtd_info *cfi_probe(struct map_info *map)
|
| 311 |
|
|
{
|
| 312 |
|
|
/*
|
| 313 |
|
|
* Just use the generic probe stuff to call our CFI-specific
|
| 314 |
|
|
* chip_probe routine in all the possible permutations, etc.
|
| 315 |
|
|
*/
|
| 316 |
|
|
return mtd_do_chip_probe(map, &cfi_chip_probe);
|
| 317 |
|
|
}
|
| 318 |
|
|
|
| 319 |
|
|
static struct mtd_chip_driver cfi_chipdrv = {
|
| 320 |
|
|
probe: cfi_probe,
|
| 321 |
|
|
name: "cfi_probe",
|
| 322 |
|
|
module: THIS_MODULE
|
| 323 |
|
|
};
|
| 324 |
|
|
|
| 325 |
|
|
int __init cfi_probe_init(void)
|
| 326 |
|
|
{
|
| 327 |
|
|
register_mtd_chip_driver(&cfi_chipdrv);
|
| 328 |
|
|
return 0;
|
| 329 |
|
|
}
|
| 330 |
|
|
|
| 331 |
|
|
static void __exit cfi_probe_exit(void)
|
| 332 |
|
|
{
|
| 333 |
|
|
unregister_mtd_chip_driver(&cfi_chipdrv);
|
| 334 |
|
|
}
|
| 335 |
|
|
|
| 336 |
|
|
module_init(cfi_probe_init);
|
| 337 |
|
|
module_exit(cfi_probe_exit);
|
| 338 |
|
|
|
| 339 |
|
|
MODULE_LICENSE("GPL");
|
| 340 |
|
|
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
|
| 341 |
|
|
MODULE_DESCRIPTION("Probe code for CFI-compliant flash chips");
|
