63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
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/*
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* Broadcom specific AMBA
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* ChipCommon NAND flash interface
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include "bcma_private.h"
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#include <linux/bitops.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/brcmnand.h>
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#include <linux/bcma/bcma.h>
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/* Alternate NAND controller driver name in order to allow both bcm47xxnflash
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* and bcma_brcmnand to be built into the same kernel image.
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*/
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static const char *bcma_nflash_alt_name = "bcma_brcmnand";
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struct platform_device bcma_nflash_dev = {
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.name = "bcma_nflash",
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.num_resources = 0,
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};
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static const char *probes[] = { "bcm47xxpart", NULL };
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/* Initialize NAND flash access */
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int bcma_nflash_init(struct bcma_drv_cc *cc)
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{
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struct bcma_bus *bus = cc->core->bus;
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u32 reg;
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if (bus->chipinfo.id != BCMA_CHIP_ID_BCM4706 &&
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cc->core->id.rev != 38) {
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bcma_err(bus, "NAND flash on unsupported board!\n");
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return -ENOTSUPP;
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}
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if (!(cc->capabilities & BCMA_CC_CAP_NFLASH)) {
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bcma_err(bus, "NAND flash not present according to ChipCommon\n");
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return -ENODEV;
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}
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cc->nflash.present = true;
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if (cc->core->id.rev == 38 &&
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(cc->status & BCMA_CC_CHIPST_5357_NAND_BOOT)) {
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cc->nflash.boot = true;
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/* Determine the chip select that is being used */
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reg = bcma_cc_read32(cc, BCMA_CC_NAND_CS_NAND_SELECT) & 0xff;
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cc->nflash.brcmnand_info.chip_select = ffs(reg) - 1;
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cc->nflash.brcmnand_info.part_probe_types = probes;
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cc->nflash.brcmnand_info.ecc_stepsize = 512;
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cc->nflash.brcmnand_info.ecc_strength = 1;
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bcma_nflash_dev.name = bcma_nflash_alt_name;
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}
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/* Prepare platform device, but don't register it yet. It's too early,
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* malloc (required by device_private_init) is not available yet. */
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bcma_nflash_dev.dev.platform_data = &cc->nflash;
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return 0;
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}
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