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   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2010 by Spencer Oliver                                  *
   5  *   spen@spen-soft.co.uk                                                  *
   6  ***************************************************************************/
   7
   8 /*
   9  * NAND controller interface for Nuvoton NUC910
  10  */
  11
  12 #ifdef HAVE_CONFIG_H
  13 #include "config.h"
  14 #endif
  15
  16 #include "imp.h"
  17 #include "nuc910.h"
  18 #include "arm_io.h"
  19 #include <target/arm.h>
  20
  21 struct nuc910_nand_controller {
  22         struct arm_nand_data io;
  23 };
  24
  25 static int validate_target_state(struct nand_device *nand)
  26 {
  27         struct target *target = nand->target;
  28
  29         if (target->state != TARGET_HALTED) {
  30                 LOG_ERROR("Target not halted");
  31                 return ERROR_NAND_OPERATION_FAILED;
  32         }
  33
  34         return ERROR_OK;
  35 }
  36
  37 static int nuc910_nand_command(struct nand_device *nand, uint8_t command)
  38 {
  39         struct target *target = nand->target;
  40         int result;
  41
  42         result = validate_target_state(nand);
  43         if (result != ERROR_OK)
  44                 return result;
  45
  46         target_write_u8(target, NUC910_SMCMD, command);
  47         return ERROR_OK;
  48 }
  49
  50 static int nuc910_nand_address(struct nand_device *nand, uint8_t address)
  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_u32(target, NUC910_SMADDR, ((address & 0xff) | NUC910_SMADDR_EOA));
  60         return ERROR_OK;
  61 }
  62
  63 static int nuc910_nand_read(struct nand_device *nand, void *data)
  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_read_u8(target, NUC910_SMDATA, data);
  73         return ERROR_OK;
  74 }
  75
  76 static int nuc910_nand_write(struct nand_device *nand, uint16_t 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_write_u8(target, NUC910_SMDATA, data);
  86         return ERROR_OK;
  87 }
  88
  89 static int nuc910_nand_read_block_data(struct nand_device *nand,
  90                 uint8_t *data, int data_size)
  91 {
  92         struct nuc910_nand_controller *nuc910_nand = nand->controller_priv;
  93         int result;
  94
  95         result = validate_target_state(nand);
  96         if (result != ERROR_OK)
  97                 return result;
  98
  99         nuc910_nand->io.chunk_size = nand->page_size;
 100
 101         /* try the fast way first */
 102         result = arm_nandread(&nuc910_nand->io, data, data_size);
 103         if (result != ERROR_NAND_NO_BUFFER)
 104                 return result;
 105
 106         /* else do it slowly */
 107         while (data_size--)
 108                 nuc910_nand_read(nand, data++);
 109
 110         return ERROR_OK;
 111 }
 112
 113 static int nuc910_nand_write_block_data(struct nand_device *nand,
 114                 uint8_t *data, int data_size)
 115 {
 116         struct nuc910_nand_controller *nuc910_nand = nand->controller_priv;
 117         int result;
 118
 119         result = validate_target_state(nand);
 120         if (result != ERROR_OK)
 121                 return result;
 122
 123         nuc910_nand->io.chunk_size = nand->page_size;
 124
 125         /* try the fast way first */
 126         result = arm_nandwrite(&nuc910_nand->io, data, data_size);
 127         if (result != ERROR_NAND_NO_BUFFER)
 128                 return result;
 129
 130         /* else do it slowly */
 131         while (data_size--)
 132                 nuc910_nand_write(nand, *data++);
 133
 134         return ERROR_OK;
 135 }
 136
 137 static int nuc910_nand_reset(struct nand_device *nand)
 138 {
 139         return nuc910_nand_command(nand, NAND_CMD_RESET);
 140 }
 141
 142 static int nuc910_nand_ready(struct nand_device *nand, int timeout)
 143 {
 144         struct target *target = nand->target;
 145         uint32_t status;
 146
 147         do {
 148                 target_read_u32(target, NUC910_SMISR, &status);
 149                 if (status & NUC910_SMISR_RB_)
 150                         return 1;
 151                 alive_sleep(1);
 152         } while (timeout-- > 0);
 153
 154         return 0;
 155 }
 156
 157 NAND_DEVICE_COMMAND_HANDLER(nuc910_nand_device_command)
 158 {
 159         struct nuc910_nand_controller *nuc910_nand;
 160
 161         nuc910_nand = calloc(1, sizeof(struct nuc910_nand_controller));
 162         if (!nuc910_nand) {
 163                 LOG_ERROR("no memory for nand controller");
 164                 return ERROR_NAND_DEVICE_INVALID;
 165         }
 166
 167         nand->controller_priv = nuc910_nand;
 168         return ERROR_OK;
 169 }
 170
 171 static int nuc910_nand_init(struct nand_device *nand)
 172 {
 173         struct nuc910_nand_controller *nuc910_nand = nand->controller_priv;
 174         struct target *target = nand->target;
 175         int bus_width = nand->bus_width ? nand->bus_width : 8;
 176         int result;
 177
 178         result = validate_target_state(nand);
 179         if (result != ERROR_OK)
 180                 return result;
 181
 182         /* nuc910 only supports 8bit */
 183         if (bus_width != 8) {
 184                 LOG_ERROR("nuc910 only supports 8 bit bus width, not %i", bus_width);
 185                 return ERROR_NAND_OPERATION_NOT_SUPPORTED;
 186         }
 187
 188         /* inform calling code about selected bus width */
 189         nand->bus_width = bus_width;
 190
 191         nuc910_nand->io.target = target;
 192         nuc910_nand->io.data = NUC910_SMDATA;
 193         nuc910_nand->io.op = ARM_NAND_NONE;
 194
 195         /* configure nand controller */
 196         target_write_u32(target, NUC910_FMICSR, NUC910_FMICSR_SM_EN);
 197         target_write_u32(target, NUC910_SMCSR, 0x010000a8);     /* 2048 page size */
 198         target_write_u32(target, NUC910_SMTCR, 0x00010204);
 199         target_write_u32(target, NUC910_SMIER, 0x00000000);
 200
 201         return ERROR_OK;
 202 }
 203
 204 struct nand_flash_controller nuc910_nand_controller = {
 205         .name = "nuc910",
 206         .command = nuc910_nand_command,
 207         .address = nuc910_nand_address,
 208         .read_data = nuc910_nand_read,
 209         .write_data     = nuc910_nand_write,
 210         .write_block_data = nuc910_nand_write_block_data,
 211         .read_block_data = nuc910_nand_read_block_data,
 212         .nand_ready = nuc910_nand_ready,
 213         .reset = nuc910_nand_reset,
 214         .nand_device_command = nuc910_nand_device_command,
 215         .init = nuc910_nand_init,
 216 };