target/linux/lantiq/patches/0016-MIPS-lantiq-adds-xway-nand-driver.patch

   1 From e2d5b4ba92289cb0fcc9db741d159ef5eb852d9f Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sat, 27 Aug 2011 20:08:14 +0200
   4 Subject: [PATCH 16/24] MIPS: lantiq: adds xway nand driver
   5
   6 This patch adds a nand driver for XWAY SoCs. The patch makes use of the
   7 plat_nand driver. As with the EBU NOR driver merged in 3.0, we have the
   8 endianess swap problem on read. To workaround this problem we make the
   9 read_byte() callback available via the plat_nand driver causing the nand
  10 layer to do byte reads.
  11
  12 Signed-off-by: John Crispin <blogic@openwrt.org>
  13
  14 TODO : memory ranges
  15        cs lines
  16        plat dev
  17        ebu2 and not ebu1 ?
  18 ---
  19  .../mips/include/asm/mach-lantiq/xway/lantiq_soc.h |    2 +
  20  arch/mips/lantiq/xway/Makefile                     |    2 +-
  21  arch/mips/lantiq/xway/nand.c                       |  185 ++++++++++++++++++++
  22  drivers/mtd/nand/plat_nand.c                       |    1 +
  23  include/linux/mtd/nand.h                           |    1 +
  24  5 files changed, 190 insertions(+), 1 deletions(-)
  25  create mode 100644 arch/mips/lantiq/xway/nand.c
  26
  27 --- a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
  28 +++ b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
  29 @@ -140,6 +140,8 @@
  30  /* register access macros for EBU and CGU */
  31  #define ltq_ebu_w32(x, y)      ltq_w32((x), ltq_ebu_membase + (y))
  32  #define ltq_ebu_r32(x)         ltq_r32(ltq_ebu_membase + (x))
  33 +#define ltq_ebu_w32_mask(x, y, z) \
  34 +       ltq_w32_mask(x, y, ltq_ebu_membase + (z))
  35  #define ltq_cgu_w32(x, y)      ltq_w32((x), ltq_cgu_membase + (y))
  36  #define ltq_cgu_r32(x)         ltq_r32(ltq_cgu_membase + (x))
  37
  38 --- a/arch/mips/lantiq/xway/Makefile
  39 +++ b/arch/mips/lantiq/xway/Makefile
  40 @@ -1,4 +1,4 @@
  41 -obj-y := sysctrl.o reset.o gpio.o gpio_stp.o gpio_ebu.o devices.o dma.o
  42 +obj-y := sysctrl.o reset.o gpio.o gpio_stp.o gpio_ebu.o devices.o dma.o nand.o
  43
  44  obj-$(CONFIG_SOC_XWAY) += clk-xway.o prom-xway.o
  45  obj-$(CONFIG_SOC_AMAZON_SE) += clk-ase.o prom-ase.o
  46 --- /dev/null
  47 +++ b/arch/mips/lantiq/xway/nand.c
  48 @@ -0,0 +1,185 @@
  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 version 2 as published
  52 + *  by the Free Software Foundation.
  53 + *
  54 + *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
  55 + */
  56 +
  57 +#include <linux/mtd/physmap.h>
  58 +#include <linux/mtd/nand.h>
  59 +#include <linux/platform_device.h>
  60 +
  61 +#include <lantiq_soc.h>
  62 +#include <lantiq_irq.h>
  63 +#include <lantiq_platform.h>
  64 +
  65 +#include "devices.h"
  66 +
  67 +/* nand registers */
  68 +#define LTQ_EBU_NAND_WAIT       0xB4
  69 +#define LTQ_EBU_NAND_ECC0       0xB8
  70 +#define LTQ_EBU_NAND_ECC_AC     0xBC
  71 +#define LTQ_EBU_NAND_CON        0xB0
  72 +#define LTQ_EBU_ADDSEL1         0x24
  73 +
  74 +/* gpio definitions */
  75 +#define PIN_ALE    13
  76 +#define PIN_CLE    24
  77 +#define PIN_CS1    23
  78 +#define PIN_RDY    48  /* NFLASH_READY */
  79 +#define PIN_RD     49  /* NFLASH_READ_N */
  80 +
  81 +#define NAND_CMD_ALE            (1 << 2)
  82 +#define NAND_CMD_CLE            (1 << 3)
  83 +#define NAND_CMD_CS             (1 << 4)
  84 +#define NAND_WRITE_CMD_RESET    0xff
  85 +#define NAND_WRITE_CMD          (NAND_CMD_CS | NAND_CMD_CLE)
  86 +#define NAND_WRITE_ADDR         (NAND_CMD_CS | NAND_CMD_ALE)
  87 +#define NAND_WRITE_DATA         (NAND_CMD_CS)
  88 +#define NAND_READ_DATA          (NAND_CMD_CS)
  89 +#define NAND_WAIT_WR_C          (1 << 3)
  90 +#define NAND_WAIT_RD            (0x1)
  91 +
  92 +#define ADDSEL1_MASK(x)         (x << 4)
  93 +#define ADDSEL1_REGEN           1
  94 +#define BUSCON1_SETUP           (1 << 22)
  95 +#define BUSCON1_BCGEN_RES       (0x3 << 12)
  96 +#define BUSCON1_WAITWRC2        (2 << 8)
  97 +#define BUSCON1_WAITRDC2        (2 << 6)
  98 +#define BUSCON1_HOLDC1          (1 << 4)
  99 +#define BUSCON1_RECOVC1         (1 << 2)
 100 +#define BUSCON1_CMULT4          1
 101 +#define NAND_CON_NANDM          1
 102 +#define NAND_CON_CSMUX          (1 << 1)
 103 +#define NAND_CON_CS_P           (1 << 4)
 104 +#define NAND_CON_SE_P           (1 << 5)
 105 +#define NAND_CON_WP_P           (1 << 6)
 106 +#define NAND_CON_PRE_P          (1 << 7)
 107 +#define NAND_CON_IN_CS0         0
 108 +#define NAND_CON_OUT_CS0        0
 109 +#define NAND_CON_IN_CS1         (1 << 8)
 110 +#define NAND_CON_OUT_CS1        (1 << 10)
 111 +#define NAND_CON_CE             (1 << 20)
 112 +
 113 +#define NAND_BASE_ADDRESS       (KSEG1 | 0x14000000)
 114 +
 115 +static const char *part_probes[] = { "cmdlinepart", NULL };
 116 +
 117 +static void
 118 +xway_select_chip(struct mtd_info *mtd, int chip)
 119 +{
 120 +       switch (chip) {
 121 +       case -1:
 122 +               ltq_ebu_w32_mask(NAND_CON_CE, 0, LTQ_EBU_NAND_CON);
 123 +               ltq_ebu_w32_mask(NAND_CON_NANDM, 0, LTQ_EBU_NAND_CON);
 124 +               break;
 125 +       case 0:
 126 +               ltq_ebu_w32_mask(0, NAND_CON_NANDM, LTQ_EBU_NAND_CON);
 127 +               ltq_ebu_w32_mask(0, NAND_CON_CE, LTQ_EBU_NAND_CON);
 128 +               /* reset the nand chip */
 129 +               while((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0);
 130 +               ltq_w32(NAND_WRITE_CMD_RESET, ((u32*)(NAND_BASE_ADDRESS | NAND_WRITE_CMD)));
 131 +               break;
 132 +       default:
 133 +               BUG();
 134 +       }
 135 +}
 136 +
 137 +static void
 138 +xway_cmd_ctrl(struct mtd_info *mtd, int data, unsigned int ctrl)
 139 +{
 140 +       struct nand_chip *this = mtd->priv;
 141 +
 142 +       if (ctrl & NAND_CTRL_CHANGE) {
 143 +               if(ctrl & NAND_CLE)
 144 +                       this->IO_ADDR_W = (void __iomem *)(NAND_BASE_ADDRESS | NAND_WRITE_CMD);
 145 +               else if(ctrl & NAND_ALE)
 146 +                       this->IO_ADDR_W = (void __iomem *)(NAND_BASE_ADDRESS | NAND_WRITE_ADDR);
 147 +       }
 148 +
 149 +       if(data != NAND_CMD_NONE) {
 150 +               *(volatile u8*)((u32)this->IO_ADDR_W) = data;
 151 +               while((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0);
 152 +       }
 153 +}
 154 +
 155 +static int
 156 +xway_dev_ready(struct mtd_info *mtd)
 157 +{
 158 +       return ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_RD;
 159 +}
 160 +
 161 +void
 162 +nand_write(unsigned int addr, unsigned int val)
 163 +{
 164 +       ltq_w32(val, ((u32*)(NAND_BASE_ADDRESS | addr)));
 165 +       while((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0);
 166 +}
 167 +
 168 +unsigned char
 169 +ltq_nand_read_byte(struct mtd_info *mtd)
 170 +{
 171 +       return ltq_r8((void __iomem *)(NAND_BASE_ADDRESS | (NAND_READ_DATA)));
 172 +}
 173 +
 174 +int xway_nand_probe(struct platform_device *pdev)
 175 +{
 176 +//     ltq_gpio_request(PIN_CS1, 1, 0, 1, "NAND_CS1");
 177 +       ltq_gpio_request(PIN_CLE, 1, 0, 1, "NAND_CLE");
 178 +       ltq_gpio_request(PIN_ALE, 1, 0, 1, "NAND_ALE");
 179 +       if (ltq_is_ar9() || ltq_is_vr9()) {
 180 +               ltq_gpio_request(PIN_RDY, 1, 0, 0, "NAND_BSY");
 181 +               ltq_gpio_request(PIN_RD, 1, 0, 1, "NAND_RD");
 182 +       }
 183 +
 184 +       ltq_ebu_w32((NAND_BASE_ADDRESS & 0x1fffff00)
 185 +               | ADDSEL1_MASK(3) | ADDSEL1_REGEN, LTQ_EBU_ADDSEL1);
 186 +
 187 +       ltq_ebu_w32(BUSCON1_SETUP | BUSCON1_BCGEN_RES | BUSCON1_WAITWRC2
 188 +               | BUSCON1_WAITRDC2 | BUSCON1_HOLDC1 | BUSCON1_RECOVC1
 189 +               | BUSCON1_CMULT4, LTQ_EBU_BUSCON1);
 190 +
 191 +       ltq_ebu_w32(NAND_CON_NANDM | NAND_CON_CSMUX | NAND_CON_CS_P
 192 +               | NAND_CON_SE_P | NAND_CON_WP_P | NAND_CON_PRE_P
 193 +               | NAND_CON_IN_CS0 | NAND_CON_OUT_CS0, LTQ_EBU_NAND_CON);
 194 +
 195 +       ltq_w32(NAND_WRITE_CMD_RESET, ((u32*)(NAND_BASE_ADDRESS | NAND_WRITE_CMD)));
 196 +       while((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0);
 197 +
 198 +       return 0;
 199 +}
 200 +
 201 +static struct platform_nand_data falcon_flash_nand_data = {
 202 +       .chip = {
 203 +               .nr_chips               = 1,
 204 +               .chip_delay             = 30,
 205 +               .part_probe_types       = part_probes,
 206 +       },
 207 +       .ctrl = {
 208 +               .probe          = xway_nand_probe,
 209 +               .cmd_ctrl       = xway_cmd_ctrl,
 210 +               .dev_ready      = xway_dev_ready,
 211 +               .select_chip    = xway_select_chip,
 212 +               .read_byte = ltq_nand_read_byte,
 213 +       }
 214 +};
 215 +
 216 +static struct resource ltq_nand_res =
 217 +       MEM_RES("nand", 0x14000000, 0x3ffffff);
 218 +
 219 +static struct platform_device ltq_flash_nand = {
 220 +       .name           = "gen_nand",
 221 +       .id             = -1,
 222 +       .num_resources  = 1,
 223 +       .resource       = &ltq_nand_res,
 224 +       .dev            = {
 225 +               .platform_data = &falcon_flash_nand_data,
 226 +       },
 227 +};
 228 +
 229 +void __init
 230 +xway_register_nand(void)
 231 +{
 232 +       platform_device_register(&ltq_flash_nand);
 233 +}
 234 --- a/drivers/mtd/nand/plat_nand.c
 235 +++ b/drivers/mtd/nand/plat_nand.c
 236 @@ -77,6 +77,7 @@ static int __devinit plat_nand_probe(str
 237         data->chip.select_chip = pdata->ctrl.select_chip;
 238         data->chip.write_buf = pdata->ctrl.write_buf;
 239         data->chip.read_buf = pdata->ctrl.read_buf;
 240 +       data->chip.read_byte = pdata->ctrl.read_byte;
 241         data->chip.chip_delay = pdata->chip.chip_delay;
 242         data->chip.options |= pdata->chip.options;
 243
 244 --- a/include/linux/mtd/nand.h
 245 +++ b/include/linux/mtd/nand.h
 246 @@ -657,6 +657,7 @@ struct platform_nand_ctrl {
 247         void (*cmd_ctrl)(struct mtd_info *mtd, int dat, unsigned int ctrl);
 248         void (*write_buf)(struct mtd_info *mtd, const uint8_t *buf, int len);
 249         void (*read_buf)(struct mtd_info *mtd, uint8_t *buf, int len);
 250 +       unsigned char (*read_byte)(struct mtd_info *mtd);
 251         void *priv;
 252  };
 253