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   1 /***************************************************************************
   2  *   Copyright (C) 2010 by Spencer Oliver                                  *
   3  *   spen@spen-soft.co.uk                                                  *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  19  ***************************************************************************/
  20
  21 /*
  22  * NAND controller interface for Nuvoton NUC910
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include "imp.h"
  30 #include "nuc910.h"
  31 #include "arm_io.h"
  32 #include <target/arm.h>
  33
  34 struct nuc910_nand_controller {
  35         struct arm_nand_data io;
  36 };
  37
  38 static int validate_target_state(struct nand_device *nand)
  39 {
  40         struct target *target = nand->target;
  41
  42         if (target->state != TARGET_HALTED) {
  43                 LOG_ERROR("Target not halted");
  44                 return ERROR_NAND_OPERATION_FAILED;
  45         }
  46
  47         return ERROR_OK;
  48 }
  49
  50 static int nuc910_nand_command(struct nand_device *nand, uint8_t command)
  51 {
  52         struct target *target = nand->target;
  53         int result;
  54
  55         result = validate_target_state(nand);
  56         if (result != ERROR_OK)
  57                 return result;
  58
  59         target_write_u8(target, NUC910_SMCMD, command);
  60         return ERROR_OK;
  61 }
  62
  63 static int nuc910_nand_address(struct nand_device *nand, uint8_t address)
  64 {
  65         struct target *target = nand->target;
  66         int result;
  67
  68         result = validate_target_state(nand);
  69         if (result != ERROR_OK)
  70                 return result;
  71
  72         target_write_u32(target, NUC910_SMADDR, ((address & 0xff) | NUC910_SMADDR_EOA));
  73         return ERROR_OK;
  74 }
  75
  76 static int nuc910_nand_read(struct nand_device *nand, void *data)
  77 {
  78         struct target *target = nand->target;
  79         int result;
  80
  81         result = validate_target_state(nand);
  82         if (result != ERROR_OK)
  83                 return result;
  84
  85         target_read_u8(target, NUC910_SMDATA, data);
  86         return ERROR_OK;
  87 }
  88
  89 static int nuc910_nand_write(struct nand_device *nand, uint16_t data)
  90 {
  91         struct target *target = nand->target;
  92         int result;
  93
  94         result = validate_target_state(nand);
  95         if (result != ERROR_OK)
  96                 return result;
  97
  98         target_write_u8(target, NUC910_SMDATA, data);
  99         return ERROR_OK;
 100 }
 101
 102 static int nuc910_nand_read_block_data(struct nand_device *nand,
 103                 uint8_t *data, int data_size)
 104 {
 105         struct nuc910_nand_controller *nuc910_nand = nand->controller_priv;
 106         int result;
 107
 108         result = validate_target_state(nand);
 109         if (result != ERROR_OK)
 110                 return result;
 111
 112         nuc910_nand->io.chunk_size = nand->page_size;
 113
 114         /* try the fast way first */
 115         result = arm_nandread(&nuc910_nand->io, data, data_size);
 116         if (result != ERROR_NAND_NO_BUFFER)
 117                 return result;
 118
 119         /* else do it slowly */
 120         while (data_size--)
 121                 nuc910_nand_read(nand, data++);
 122
 123         return ERROR_OK;
 124 }
 125
 126 static int nuc910_nand_write_block_data(struct nand_device *nand,
 127                 uint8_t *data, int data_size)
 128 {
 129         struct nuc910_nand_controller *nuc910_nand = nand->controller_priv;
 130         int result;
 131
 132         result = validate_target_state(nand);
 133         if (result != ERROR_OK)
 134                 return result;
 135
 136         nuc910_nand->io.chunk_size = nand->page_size;
 137
 138         /* try the fast way first */
 139         result = arm_nandwrite(&nuc910_nand->io, data, data_size);
 140         if (result != ERROR_NAND_NO_BUFFER)
 141                 return result;
 142
 143         /* else do it slowly */
 144         while (data_size--)
 145                 nuc910_nand_write(nand, *data++);
 146
 147         return ERROR_OK;
 148 }
 149
 150 static int nuc910_nand_reset(struct nand_device *nand)
 151 {
 152         return nuc910_nand_command(nand, NAND_CMD_RESET);
 153 }
 154
 155 static int nuc910_nand_ready(struct nand_device *nand, int timeout)
 156 {
 157         struct target *target = nand->target;
 158         uint32_t status;
 159
 160         do {
 161                 target_read_u32(target, NUC910_SMISR, &status);
 162                 if (status & NUC910_SMISR_RB_)
 163                         return 1;
 164                 alive_sleep(1);
 165         } while (timeout-- > 0);
 166
 167         return 0;
 168 }
 169
 170 NAND_DEVICE_COMMAND_HANDLER(nuc910_nand_device_command)
 171 {
 172         struct nuc910_nand_controller *nuc910_nand;
 173
 174         nuc910_nand = calloc(1, sizeof(struct nuc910_nand_controller));
 175         if (!nuc910_nand) {
 176                 LOG_ERROR("no memory for nand controller");
 177                 return ERROR_NAND_DEVICE_INVALID;
 178         }
 179
 180         nand->controller_priv = nuc910_nand;
 181         return ERROR_OK;
 182 }
 183
 184 static int nuc910_nand_init(struct nand_device *nand)
 185 {
 186         struct nuc910_nand_controller *nuc910_nand = nand->controller_priv;
 187         struct target *target = nand->target;
 188         int bus_width = nand->bus_width ? : 8;
 189         int result;
 190
 191         result = validate_target_state(nand);
 192         if (result != ERROR_OK)
 193                 return result;
 194
 195         /* nuc910 only supports 8bit */
 196         if (bus_width != 8) {
 197                 LOG_ERROR("nuc910 only supports 8 bit bus width, not %i", bus_width);
 198                 return ERROR_NAND_OPERATION_NOT_SUPPORTED;
 199         }
 200
 201         /* inform calling code about selected bus width */
 202         nand->bus_width = bus_width;
 203
 204         nuc910_nand->io.target = target;
 205         nuc910_nand->io.data = NUC910_SMDATA;
 206         nuc910_nand->io.op = ARM_NAND_NONE;
 207
 208         /* configure nand controller */
 209         target_write_u32(target, NUC910_FMICSR, NUC910_FMICSR_SM_EN);
 210         target_write_u32(target, NUC910_SMCSR, 0x010000a8);     /* 2048 page size */
 211         target_write_u32(target, NUC910_SMTCR, 0x00010204);
 212         target_write_u32(target, NUC910_SMIER, 0x00000000);
 213
 214         return ERROR_OK;
 215 }
 216
 217 struct nand_flash_controller nuc910_nand_controller = {
 218         .name = "nuc910",
 219         .command = nuc910_nand_command,
 220         .address = nuc910_nand_address,
 221         .read_data = nuc910_nand_read,
 222         .write_data     = nuc910_nand_write,
 223         .write_block_data = nuc910_nand_write_block_data,
 224         .read_block_data = nuc910_nand_read_block_data,
 225         .nand_ready = nuc910_nand_ready,
 226         .reset = nuc910_nand_reset,
 227         .nand_device_command = nuc910_nand_device_command,
 228         .init = nuc910_nand_init,
 229 };