1 /* 2 * Broadcom specific AMBA 3 * ChipCommon NAND flash interface 4 * 5 * Licensed under the GNU/GPL. See COPYING for details. 6 */ 7 8 #include "bcma_private.h" 9 10 #include <linux/bitops.h> 11 #include <linux/platform_device.h> 12 #include <linux/platform_data/brcmnand.h> 13 #include <linux/bcma/bcma.h> 14 15 /* Alternate NAND controller driver name in order to allow both bcm47xxnflash 16 * and bcma_brcmnand to be built into the same kernel image. 17 */ 18 static const char *bcma_nflash_alt_name = "bcma_brcmnand"; 19 20 struct platform_device bcma_nflash_dev = { 21 .name = "bcma_nflash", 22 .num_resources = 0, 23 }; 24 25 static const char *probes[] = { "bcm47xxpart", NULL }; 26 27 /* Initialize NAND flash access */ 28 int bcma_nflash_init(struct bcma_drv_cc *cc) 29 { 30 struct bcma_bus *bus = cc->core->bus; 31 u32 reg; 32 33 if (bus->chipinfo.id != BCMA_CHIP_ID_BCM4706 && 34 cc->core->id.rev != 38) { 35 bcma_err(bus, "NAND flash on unsupported board!\n"); 36 return -ENOTSUPP; 37 } 38 39 if (!(cc->capabilities & BCMA_CC_CAP_NFLASH)) { 40 bcma_err(bus, "NAND flash not present according to ChipCommon\n"); 41 return -ENODEV; 42 } 43 44 cc->nflash.present = true; 45 if (cc->core->id.rev == 38 && 46 (cc->status & BCMA_CC_CHIPST_5357_NAND_BOOT)) { 47 cc->nflash.boot = true; 48 /* Determine the chip select that is being used */ 49 reg = bcma_cc_read32(cc, BCMA_CC_NAND_CS_NAND_SELECT) & 0xff; 50 cc->nflash.brcmnand_info.chip_select = ffs(reg) - 1; 51 cc->nflash.brcmnand_info.part_probe_types = probes; 52 cc->nflash.brcmnand_info.ecc_stepsize = 512; 53 cc->nflash.brcmnand_info.ecc_strength = 1; 54 bcma_nflash_dev.name = bcma_nflash_alt_name; 55 } 56 57 /* Prepare platform device, but don't register it yet. It's too early, 58 * malloc (required by device_private_init) is not available yet. */ 59 bcma_nflash_dev.dev.platform_data = &cc->nflash; 60 61 return 0; 62 } 63