target/linux/brcm47xx/patches-3.2/026-mtd-bcm47xx-add-parallel-flash-driver.patch

   1 From 36f8b899174a445a98fe02ed8d1db177525f0c52 Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Sun, 17 Jul 2011 14:55:18 +0200
   4 Subject: [PATCH 07/15] mtd: bcm47xx: add parallel flash driver
   5
   6
   7 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
   8 ---
   9  drivers/mtd/maps/Kconfig          |    9 ++
  10  drivers/mtd/maps/Makefile         |    1 +
  11  drivers/mtd/maps/bcm47xx-pflash.c |  188 +++++++++++++++++++++++++++++++++++++
  12  3 files changed, 198 insertions(+), 0 deletions(-)
  13  create mode 100644 drivers/mtd/maps/bcm47xx-pflash.c
  14
  15 --- a/drivers/mtd/maps/Kconfig
  16 +++ b/drivers/mtd/maps/Kconfig
  17 @@ -257,6 +257,15 @@ config MTD_LANTIQ
  18         help
  19           Support for NOR flash attached to the Lantiq SoC's External Bus Unit.
  20
  21 +config MTD_BCM47XX_PFLASH
  22 +       tristate "bcm47xx parallel flash support"
  23 +       default y
  24 +       depends on BCM47XX
  25 +       select MTD_PARTITIONS
  26 +       select MTD_BCM47XX_PARTS
  27 +       help
  28 +         Support for bcm47xx parallel flash
  29 +
  30  config MTD_DILNETPC
  31         tristate "CFI Flash device mapped on DIL/Net PC"
  32         depends on X86 && MTD_CFI_INTELEXT && BROKEN
  33 --- a/drivers/mtd/maps/Makefile
  34 +++ b/drivers/mtd/maps/Makefile
  35 @@ -58,3 +58,4 @@ obj-$(CONFIG_MTD_GPIO_ADDR)   += gpio-addr
  36  obj-$(CONFIG_MTD_BCM963XX)     += bcm963xx-flash.o
  37  obj-$(CONFIG_MTD_LATCH_ADDR)   += latch-addr-flash.o
  38  obj-$(CONFIG_MTD_LANTIQ)       += lantiq-flash.o
  39 +obj-$(CONFIG_MTD_BCM47XX_PFLASH)+= bcm47xx-pflash.o
  40 --- /dev/null
  41 +++ b/drivers/mtd/maps/bcm47xx-pflash.c
  42 @@ -0,0 +1,188 @@
  43 +/*
  44 + *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
  45 + *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
  46 + *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
  47 + *
  48 + *  original functions for finding root filesystem from Mike Baker
  49 + *
  50 + *  This program is free software; you can redistribute  it and/or modify it
  51 + *  under  the terms of  the GNU General  Public License as published by the
  52 + *  Free Software Foundation;  either version 2 of the  License, or (at your
  53 + *  option) any later version.
  54 + *
  55 + *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  56 + *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  57 + *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  58 + *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  59 + *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  60 + *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  61 + *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  62 + *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  63 + *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  64 + *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  65 + *
  66 + *  You should have received a copy of the  GNU General Public License along
  67 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  68 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  69 + *
  70 + *  Copyright 2001-2003, Broadcom Corporation
  71 + *  All Rights Reserved.
  72 + *
  73 + *  THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
  74 + *  KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
  75 + *  SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  76 + *  FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  77 + *
  78 + *  Flash mapping for BCM947XX boards
  79 + */
  80 +
  81 +#define pr_fmt(fmt) "bcm47xx_pflash: " fmt
  82 +#include <linux/init.h>
  83 +#include <linux/module.h>
  84 +#include <linux/types.h>
  85 +#include <linux/kernel.h>
  86 +#include <linux/sched.h>
  87 +#include <linux/mtd/mtd.h>
  88 +#include <linux/mtd/map.h>
  89 +#include <linux/mtd/partitions.h>
  90 +#include <linux/io.h>
  91 +#include <asm/mach-bcm47xx/bcm47xx.h>
  92 +#include <linux/platform_device.h>
  93 +
  94 +#define WINDOW_ADDR 0x1fc00000
  95 +#define WINDOW_SIZE 0x400000
  96 +#define BUSWIDTH 2
  97 +
  98 +static struct mtd_info *bcm47xx_mtd;
  99 +
 100 +static void bcm47xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 101 +{
 102 +       if (len == 1) {
 103 +               memcpy_fromio(to, map->virt + from, len);
 104 +       } else {
 105 +               int i;
 106 +               u16 *dest = (u16 *) to;
 107 +               u16 *src  = (u16 *) (map->virt + from);
 108 +               for (i = 0; i < (len / 2); i++)
 109 +                       dest[i] = src[i];
 110 +               if (len & 1)
 111 +                       *((u8 *)dest+len-1) = src[i] & 0xff;
 112 +       }
 113 +}
 114 +
 115 +static struct map_info bcm47xx_map = {
 116 +       name: "Physically mapped flash",
 117 +       size : WINDOW_SIZE,
 118 +       bankwidth : BUSWIDTH,
 119 +       phys : WINDOW_ADDR,
 120 +};
 121 +
 122 +static const char *probes[] = { "bcm47xx", NULL };
 123 +
 124 +static int bcm47xx_mtd_probe(struct platform_device *pdev)
 125 +{
 126 +#ifdef CONFIG_BCM47XX_SSB
 127 +       struct ssb_chipcommon *ssb_cc;
 128 +#endif
 129 +#ifdef CONFIG_BCM47XX_BCMA
 130 +       struct bcma_drv_cc *bcma_cc;
 131 +#endif
 132 +       int ret = 0;
 133 +
 134 +       switch (bcm47xx_bus_type) {
 135 +#ifdef CONFIG_BCM47XX_SSB
 136 +       case BCM47XX_BUS_TYPE_SSB:
 137 +               ssb_cc = &bcm47xx_bus.ssb.chipco;
 138 +               if (ssb_cc->flash_type != SSB_PFLASH)
 139 +                       return -ENODEV;
 140 +
 141 +               bcm47xx_map.phys = ssb_cc->pflash.window;
 142 +               bcm47xx_map.size = ssb_cc->pflash.window_size;
 143 +               bcm47xx_map.bankwidth = ssb_cc->pflash.buswidth;
 144 +               break;
 145 +#endif
 146 +#ifdef CONFIG_BCM47XX_BCMA
 147 +       case BCM47XX_BUS_TYPE_BCMA:
 148 +               bcma_cc = &bcm47xx_bus.bcma.bus.drv_cc;
 149 +               if (bcma_cc->flash_type != BCMA_PFLASH)
 150 +                       return -ENODEV;
 151 +
 152 +               bcm47xx_map.phys = bcma_cc->pflash.window;
 153 +               bcm47xx_map.size = bcma_cc->pflash.window_size;
 154 +               bcm47xx_map.bankwidth = bcma_cc->pflash.buswidth;
 155 +               break;
 156 +#endif
 157 +       }
 158 +
 159 +       pr_notice("flash init: 0x%08x 0x%08lx\n", bcm47xx_map.phys, bcm47xx_map.size);
 160 +       bcm47xx_map.virt = ioremap_nocache(bcm47xx_map.phys, bcm47xx_map.size);
 161 +
 162 +       if (!bcm47xx_map.virt) {
 163 +               pr_err("Failed to ioremap\n");
 164 +               return -EIO;
 165 +       }
 166 +
 167 +       simple_map_init(&bcm47xx_map);
 168 +       /* override copy_from routine */
 169 +       bcm47xx_map.copy_from = bcm47xx_map_copy_from;
 170 +
 171 +       bcm47xx_mtd = do_map_probe("cfi_probe", &bcm47xx_map);
 172 +       if (!bcm47xx_mtd) {
 173 +               pr_err("Failed to do_map_probe\n");
 174 +               ret = -ENXIO;
 175 +               goto err_unmap;
 176 +       }
 177 +       bcm47xx_mtd->owner = THIS_MODULE;
 178 +
 179 +       pr_notice("Flash device: 0x%lx at 0x%x\n", bcm47xx_map.size, WINDOW_ADDR);
 180 +
 181 +       ret = mtd_device_parse_register(bcm47xx_mtd, probes, NULL, NULL, 0);
 182 +
 183 +       if (ret) {
 184 +               pr_err("Flash: mtd_device_register failed\n");
 185 +               goto err_destroy;
 186 +       }
 187 +       return 0;
 188 +
 189 +err_destroy:
 190 +       map_destroy(bcm47xx_mtd);
 191 +err_unmap:
 192 +       iounmap(bcm47xx_map.virt);
 193 +       return ret;
 194 +}
 195 +
 196 +static int __devexit bcm47xx_mtd_remove(struct platform_device *pdev)
 197 +{
 198 +       mtd_device_unregister(bcm47xx_mtd);
 199 +       map_destroy(bcm47xx_mtd);
 200 +       iounmap(bcm47xx_map.virt);
 201 +       return 0;
 202 +}
 203 +
 204 +static struct platform_driver bcm47xx_mtd_driver = {
 205 +       .remove = __devexit_p(bcm47xx_mtd_remove),
 206 +       .driver = {
 207 +               .name = "bcm47xx_pflash",
 208 +               .owner = THIS_MODULE,
 209 +       },
 210 +};
 211 +
 212 +static int __init init_bcm47xx_mtd(void)
 213 +{
 214 +       int ret = platform_driver_probe(&bcm47xx_mtd_driver, bcm47xx_mtd_probe);
 215 +
 216 +       if (ret)
 217 +               pr_err("error registering platform driver: %i\n", ret);
 218 +       return ret;
 219 +}
 220 +
 221 +static void __exit exit_bcm47xx_mtd(void)
 222 +{
 223 +       platform_driver_unregister(&bcm47xx_mtd_driver);
 224 +}
 225 +
 226 +module_init(init_bcm47xx_mtd);
 227 +module_exit(exit_bcm47xx_mtd);
 228 +
 229 +MODULE_LICENSE("GPL");
 230 +MODULE_DESCRIPTION("BCM47XX parallel flash driver");