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 */
18static const char *bcma_nflash_alt_name = "bcma_brcmnand";
19
20struct platform_device bcma_nflash_dev = {
21	.name		= "bcma_nflash",
22	.num_resources	= 0,
23};
24
25static const char *probes[] = { "bcm47xxpart", NULL };
26
27/* Initialize NAND flash access */
28int 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