drivers/bcma/driver_chipcommon_sflash.c

0001 /*
0002  * Broadcom specific AMBA
0003  * ChipCommon serial flash interface
0004  *
0005  * Licensed under the GNU/GPL. See COPYING for details.
0006  */
0007
0008 #include "bcma_private.h"
0009
0010 #include <linux/platform_device.h>
0011 #include <linux/bcma/bcma.h>
0012
0013 static struct resource bcma_sflash_resource = {
0014     .name   = "bcma_sflash",
0015     .start  = BCMA_SOC_FLASH2,
0016     .end    = 0,
0017     .flags  = IORESOURCE_MEM | IORESOURCE_READONLY,
0018 };
0019
0020 struct platform_device bcma_sflash_dev = {
0021     .name       = "bcma_sflash",
0022     .resource   = &bcma_sflash_resource,
0023     .num_resources  = 1,
0024 };
0025
0026 struct bcma_sflash_tbl_e {
0027     char *name;
0028     u32 id;
0029     u32 blocksize;
0030     u16 numblocks;
0031 };
0032
0033 static const struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
0034     { "M25P20", 0x11, 0x10000, 4, },
0035     { "M25P40", 0x12, 0x10000, 8, },
0036
0037     { "M25P16", 0x14, 0x10000, 32, },
0038     { "M25P32", 0x15, 0x10000, 64, },
0039     { "M25P64", 0x16, 0x10000, 128, },
0040     { "M25FL128", 0x17, 0x10000, 256, },
0041     { "MX25L25635F", 0x18, 0x10000, 512, },
0042     { NULL },
0043 };
0044
0045 static const struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
0046     { "SST25WF512", 1, 0x1000, 16, },
0047     { "SST25VF512", 0x48, 0x1000, 16, },
0048     { "SST25WF010", 2, 0x1000, 32, },
0049     { "SST25VF010", 0x49, 0x1000, 32, },
0050     { "SST25WF020", 3, 0x1000, 64, },
0051     { "SST25VF020", 0x43, 0x1000, 64, },
0052     { "SST25WF040", 4, 0x1000, 128, },
0053     { "SST25VF040", 0x44, 0x1000, 128, },
0054     { "SST25VF040B", 0x8d, 0x1000, 128, },
0055     { "SST25WF080", 5, 0x1000, 256, },
0056     { "SST25VF080B", 0x8e, 0x1000, 256, },
0057     { "SST25VF016", 0x41, 0x1000, 512, },
0058     { "SST25VF032", 0x4a, 0x1000, 1024, },
0059     { "SST25VF064", 0x4b, 0x1000, 2048, },
0060     { NULL },
0061 };
0062
0063 static const struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
0064     { "AT45DB011", 0xc, 256, 512, },
0065     { "AT45DB021", 0x14, 256, 1024, },
0066     { "AT45DB041", 0x1c, 256, 2048, },
0067     { "AT45DB081", 0x24, 256, 4096, },
0068     { "AT45DB161", 0x2c, 512, 4096, },
0069     { "AT45DB321", 0x34, 512, 8192, },
0070     { "AT45DB642", 0x3c, 1024, 8192, },
0071     { NULL },
0072 };
0073
0074 static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
0075 {
0076     int i;
0077     bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
0078             BCMA_CC_FLASHCTL_START | opcode);
0079     for (i = 0; i < 1000; i++) {
0080         if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) &
0081               BCMA_CC_FLASHCTL_BUSY))
0082             return;
0083         cpu_relax();
0084     }
0085     bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
0086 }
0087
0088 /* Initialize serial flash access */
0089 int bcma_sflash_init(struct bcma_drv_cc *cc)
0090 {
0091     struct bcma_bus *bus = cc->core->bus;
0092     struct bcma_sflash *sflash = &cc->sflash;
0093     const struct bcma_sflash_tbl_e *e;
0094     u32 id, id2;
0095
0096     switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
0097     case BCMA_CC_FLASHT_STSER:
0098         bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
0099
0100         bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
0101         bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
0102         id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
0103
0104         bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
0105         bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
0106         id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
0107
0108         switch (id) {
0109         case 0xbf:
0110             for (e = bcma_sflash_sst_tbl; e->name; e++) {
0111                 if (e->id == id2)
0112                     break;
0113             }
0114             break;
0115         case 0x13:
0116             return -ENOTSUPP;
0117         default:
0118             for (e = bcma_sflash_st_tbl; e->name; e++) {
0119                 if (e->id == id)
0120                     break;
0121             }
0122             break;
0123         }
0124         if (!e->name) {
0125             bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2);
0126             return -ENOTSUPP;
0127         }
0128
0129         break;
0130     case BCMA_CC_FLASHT_ATSER:
0131         bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
0132         id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
0133
0134         for (e = bcma_sflash_at_tbl; e->name; e++) {
0135             if (e->id == id)
0136                 break;
0137         }
0138         if (!e->name) {
0139             bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id);
0140             return -ENOTSUPP;
0141         }
0142
0143         break;
0144     default:
0145         bcma_err(bus, "Unsupported flash type\n");
0146         return -ENOTSUPP;
0147     }
0148
0149     sflash->blocksize = e->blocksize;
0150     sflash->numblocks = e->numblocks;
0151     sflash->size = sflash->blocksize * sflash->numblocks;
0152     sflash->present = true;
0153
0154     bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
0155           e->name, sflash->size / 1024, sflash->blocksize,
0156           sflash->numblocks);
0157
0158     /* Prepare platform device, but don't register it yet. It's too early,
0159      * malloc (required by device_private_init) is not available yet. */
0160     bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start +
0161                       sflash->size;
0162     bcma_sflash_dev.dev.platform_data = sflash;
0163
0164     return 0;
0165 }