target/linux/lantiq/patches-3.9/0013-MTD-lantiq-Add-NAND-support-on-Lantiq-Falcon-SoC.patch

   1 From 6bfb122580ccf67b82abf6c5fe2ae1e770812f0d Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Wed, 30 Jan 2013 21:12:47 +0100
   4 Subject: [PATCH 13/22] MTD: lantiq: Add NAND support on Lantiq Falcon SoC.
   5
   6 The driver uses plat_nand. As the platform_device is loaded from DT, we need
   7 to lookup the node and attach our falcon specific "struct platform_nand_data"
   8 to it.
   9
  10 Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
  11 Signed-off-by: John Crispin <blogic@openwrt.org>
  12 ---
  13  drivers/mtd/nand/Kconfig       |    8 ++++
  14  drivers/mtd/nand/Makefile      |    1 +
  15  drivers/mtd/nand/falcon_nand.c |   83 ++++++++++++++++++++++++++++++++++++++++
  16  3 files changed, 92 insertions(+)
  17  create mode 100644 drivers/mtd/nand/falcon_nand.c
  18
  19 diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
  20 index 81bf5e5..2738097 100644
  21 --- a/drivers/mtd/nand/Kconfig
  22 +++ b/drivers/mtd/nand/Kconfig
  23 @@ -574,4 +574,12 @@ 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 diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
  37 index d76d912..1a61bf0 100644
  38 --- a/drivers/mtd/nand/Makefile
  39 +++ b/drivers/mtd/nand/Makefile
  40 @@ -53,5 +53,6 @@ obj-$(CONFIG_MTD_NAND_JZ4740)         += jz4740_nand.o
  41  obj-$(CONFIG_MTD_NAND_GPMI_NAND)       += gpmi-nand/
  42  obj-$(CONFIG_MTD_NAND_XWAY)            += xway_nand.o
  43  obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH)   += bcm47xxnflash/
  44 +obj-$(CONFIG_MTD_NAND_FALCON)          += falcon_nand.o
  45
  46  nand-objs := nand_base.o nand_bbt.o
  47 diff --git a/drivers/mtd/nand/falcon_nand.c b/drivers/mtd/nand/falcon_nand.c
  48 new file mode 100644
  49 index 0000000..13458d3
  50 --- /dev/null
  51 +++ b/drivers/mtd/nand/falcon_nand.c
  52 @@ -0,0 +1,83 @@
  53 +/*
  54 + * This program is free software; you can redistribute it and/or modify it
  55 + * under the terms of the GNU General Public License version 2 as published
  56 + * by the Free Software Foundation.
  57 + *
  58 + * Copyright (C) 2011 Thomas Langer <thomas.langer@lantiq.com>
  59 + * Copyright (C) 2011 John Crispin <blogic@openwrt.org>
  60 + */
  61 +
  62 +#include <linux/mtd/nand.h>
  63 +#include <linux/of_platform.h>
  64 +
  65 +#include <lantiq_soc.h>
  66 +
  67 +/* address lines used for NAND control signals */
  68 +#define NAND_ADDR_ALE          0x10000
  69 +#define NAND_ADDR_CLE          0x20000
  70 +
  71 +/* Ready/Busy Status */
  72 +#define MODCON_STS             0x0002
  73 +
  74 +/* Ready/Busy Status Edge */
  75 +#define MODCON_STSEDGE         0x0004
  76 +#define LTQ_EBU_MODCON         0x000C
  77 +
  78 +static const char const *part_probes[] = { "cmdlinepart", "ofpart", NULL };
  79 +
  80 +static int falcon_nand_ready(struct mtd_info *mtd)
  81 +{
  82 +       u32 modcon = ltq_ebu_r32(LTQ_EBU_MODCON);
  83 +
  84 +       return (((modcon & (MODCON_STS | MODCON_STSEDGE)) ==
  85 +                                               (MODCON_STS | MODCON_STSEDGE)));
  86 +}
  87 +
  88 +static void falcon_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  89 +{
  90 +       struct nand_chip *this = mtd->priv;
  91 +       unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
  92 +
  93 +       if (ctrl & NAND_CTRL_CHANGE) {
  94 +               nandaddr &= ~(NAND_ADDR_ALE | NAND_ADDR_CLE);
  95 +
  96 +               if (ctrl & NAND_CLE)
  97 +                       nandaddr |= NAND_ADDR_CLE;
  98 +               if (ctrl & NAND_ALE)
  99 +                       nandaddr |= NAND_ADDR_ALE;
 100 +
 101 +               this->IO_ADDR_W = (void __iomem *) nandaddr;
 102 +       }
 103 +
 104 +       if (cmd != NAND_CMD_NONE)
 105 +               writeb(cmd, this->IO_ADDR_W);
 106 +}
 107 +
 108 +static struct platform_nand_data falcon_nand_data = {
 109 +       .chip = {
 110 +               .nr_chips               = 1,
 111 +               .chip_delay             = 25,
 112 +               .part_probe_types       = part_probes,
 113 +       },
 114 +       .ctrl = {
 115 +               .cmd_ctrl               = falcon_hwcontrol,
 116 +               .dev_ready              = falcon_nand_ready,
 117 +       }
 118 +};
 119 +
 120 +int __init falcon_register_nand(void)
 121 +{
 122 +       struct device_node *node;
 123 +       struct platform_device *pdev;
 124 +
 125 +       node = of_find_compatible_node(NULL, NULL, "lantiq,nand-falcon");
 126 +       if (!node)
 127 +               return -1;
 128 +       pdev = of_find_device_by_node(node);
 129 +       if (pdev)
 130 +               pdev->dev.platform_data = &falcon_nand_data;
 131 +       of_node_put(node);
 132 +       return 0;
 133 +}
 134 +
 135 +arch_initcall(falcon_register_nand);
 136 --
 137 1.7.10.4
 138