target/linux/lantiq/patches-3.7/0111-MTD-MIPS-lantiq-Add-NAND-support-on-Lantiq-FALCON-So.patch

   1 From 72112b91624dca6c636bd3a592471642d3988b27 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Fri, 20 Jul 2012 19:09:01 +0200
   4 Subject: [PATCH 111/123] MTD: MIPS: lantiq: Add NAND support on Lantiq FALCON
   5  SoC.
   6
   7 The driver uses plat_nand. As the platform_device is loaded from DT, we need
   8 to lookup the node and attach our falocn specific "struct platform_nand_data"
   9 to it.
  10
  11 Signed-off-by: John Crispin <blogic@openwrt.org>
  12 Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
  13 Cc: linux-mtd@lists.infradead.org
  14 ---
  15  drivers/mtd/nand/Kconfig       |    8 ++++
  16  drivers/mtd/nand/Makefile      |    1 +
  17  drivers/mtd/nand/falcon_nand.c |   82 ++++++++++++++++++++++++++++++++++++++++
  18  3 files changed, 91 insertions(+)
  19  create mode 100644 drivers/mtd/nand/falcon_nand.c
  20
  21 --- a/drivers/mtd/nand/Kconfig
  22 +++ b/drivers/mtd/nand/Kconfig
  23 @@ -572,4 +572,12 @@ config MTD_NAND_XWAY
  24           Enables support for NAND Flash chips on Lantiq XWAY SoCs. NAND is attached
  25           to the External Bus Unit (EBU).
  26
  27 +config MTD_NAND_FALCON
  28 +       tristate "Support for NAND on Lantiq FALC-ON SoC"
  29 +       depends on LANTIQ && SOC_FALCON
  30 +       select MTD_NAND_PLATFORM
  31 +       help
  32 +         Enables support for NAND Flash chips on Lantiq FALC-ON SoCs. NAND is
  33 +         attached to the External Bus Unit (EBU).
  34 +
  35  endif # MTD_NAND
  36 --- a/drivers/mtd/nand/Makefile
  37 +++ b/drivers/mtd/nand/Makefile
  38 @@ -53,5 +53,6 @@ obj-$(CONFIG_MTD_NAND_RICOH)          += r852.o
  39  obj-$(CONFIG_MTD_NAND_JZ4740)          += jz4740_nand.o
  40  obj-$(CONFIG_MTD_NAND_GPMI_NAND)       += gpmi-nand/
  41  obj-$(CONFIG_MTD_NAND_XWAY)            += xway_nand.o
  42 +obj-$(CONFIG_MTD_NAND_FALCON)          += falcon_nand.o
  43
  44  nand-objs := nand_base.o nand_bbt.o
  45 --- /dev/null
  46 +++ b/drivers/mtd/nand/falcon_nand.c
  47 @@ -0,0 +1,82 @@
  48 +/*
  49 + * This program is free software; you can redistribute it and/or modify it
  50 + * under the terms of the GNU General Public License version 2 as published
  51 + * by the Free Software Foundation.
  52 + *
  53 + * Copyright (C) 2011 Thomas Langer <thomas.langer@lantiq.com>
  54 + * Copyright (C) 2011 John Crispin <blogic@openwrt.org>
  55 + */
  56 +
  57 +#include <linux/mtd/nand.h>
  58 +#include <linux/of_platform.h>
  59 +
  60 +#include <lantiq_soc.h>
  61 +
  62 +/* nand flash */
  63 +/* address lines used for NAND control signals */
  64 +#define NAND_ADDR_ALE          0x10000
  65 +#define NAND_ADDR_CLE          0x20000
  66 +/* Ready/Busy Status */
  67 +#define MODCON_STS             0x0002
  68 +/* Ready/Busy Status Edge */
  69 +#define MODCON_STSEDGE         0x0004
  70 +#define LTQ_EBU_MODCON         0x000C
  71 +
  72 +static const char *part_probes[] = { "cmdlinepart", "ofpart", NULL };
  73 +
  74 +static int falcon_nand_ready(struct mtd_info *mtd)
  75 +{
  76 +       u32 modcon = ltq_ebu_r32(LTQ_EBU_MODCON);
  77 +
  78 +       return (((modcon & (MODCON_STS | MODCON_STSEDGE)) ==
  79 +                                               (MODCON_STS | MODCON_STSEDGE)));
  80 +}
  81 +
  82 +static void falcon_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  83 +{
  84 +       struct nand_chip *this = mtd->priv;
  85 +       unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
  86 +
  87 +       if (ctrl & NAND_CTRL_CHANGE) {
  88 +               nandaddr &= ~(NAND_ADDR_ALE | NAND_ADDR_CLE);
  89 +
  90 +               if (ctrl & NAND_CLE)
  91 +                       nandaddr |= NAND_ADDR_CLE;
  92 +               if (ctrl & NAND_ALE)
  93 +                       nandaddr |= NAND_ADDR_ALE;
  94 +
  95 +               this->IO_ADDR_W = (void __iomem *) nandaddr;
  96 +       }
  97 +
  98 +       if (cmd != NAND_CMD_NONE)
  99 +               writeb(cmd, this->IO_ADDR_W);
 100 +}
 101 +
 102 +static struct platform_nand_data falcon_nand_data = {
 103 +       .chip = {
 104 +               .nr_chips               = 1,
 105 +               .chip_delay             = 25,
 106 +               .part_probe_types       = part_probes,
 107 +       },
 108 +       .ctrl = {
 109 +               .cmd_ctrl               = falcon_hwcontrol,
 110 +               .dev_ready              = falcon_nand_ready,
 111 +       }
 112 +};
 113 +
 114 +static int __init falcon_register_nand(void)
 115 +{
 116 +       struct device_node *node;
 117 +       struct platform_device *pdev;
 118 +
 119 +       node = of_find_compatible_node(NULL, NULL, "lantiq,nand-falcon");
 120 +       if (!node)
 121 +               return -1;
 122 +       pdev = of_find_device_by_node(node);
 123 +       if (pdev)
 124 +               pdev->dev.platform_data = &falcon_nand_data;
 125 +       of_node_put(node);
 126 +       return 0;
 127 +}
 128 +
 129 +arch_initcall(falcon_register_nand);