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02d1d0e4df
Update the BCMA's chipcommon nand flash driver to detect which chip-select is used and pass that information via platform data to the brcmnand driver. Make sure that the brcmnand platform data structure is always at the beginning of the platform data of the "nflash" device created by BCMA to allow brcmnand to safely de-reference it. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20220107184614.2670254-7-f.fainelli@gmail.com
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
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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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