drivers/bcma/driver_chipcommon_nflash.c

   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 }