arch/arm/mach-omap2/gpmc-onenand.c

   1 /*
   2  * linux/arch/arm/mach-omap2/gpmc-onenand.c
   3  *
   4  * Copyright (C) 2006 - 2009 Nokia Corporation
   5  * Contacts:    Juha Yrjola
   6  *              Tony Lindgren
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/string.h>
  14 #include <linux/kernel.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/mtd/onenand_regs.h>
  17 #include <linux/io.h>
  18
  19 #include <asm/mach/flash.h>
  20
  21 #include <plat/cpu.h>
  22 #include <plat/onenand.h>
  23 #include <plat/gpmc.h>
  24
  25 static struct omap_onenand_platform_data *gpmc_onenand_data;
  26
  27 static struct platform_device gpmc_onenand_device = {
  28         .name           = "omap2-onenand",
  29         .id             = -1,
  30 };
  31
  32 static int omap2_onenand_set_async_mode(int cs, void __iomem *onenand_base)
  33 {
  34         struct gpmc_timings t;
  35         u32 reg;
  36         int err;
  37
  38         const int t_cer = 15;
  39         const int t_avdp = 12;
  40         const int t_aavdh = 7;
  41         const int t_ce = 76;
  42         const int t_aa = 76;
  43         const int t_oe = 20;
  44         const int t_cez = 20; /* max of t_cez, t_oez */
  45         const int t_ds = 30;
  46         const int t_wpl = 40;
  47         const int t_wph = 30;
  48
  49         /* Ensure sync read and sync write are disabled */
  50         reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
  51         reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE;
  52         writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
  53
  54         memset(&t, 0, sizeof(t));
  55         t.sync_clk = 0;
  56         t.cs_on = 0;
  57         t.adv_on = 0;
  58
  59         /* Read */
  60         t.adv_rd_off = gpmc_round_ns_to_ticks(max_t(int, t_avdp, t_cer));
  61         t.oe_on  = t.adv_rd_off + gpmc_round_ns_to_ticks(t_aavdh);
  62         t.access = t.adv_on + gpmc_round_ns_to_ticks(t_aa);
  63         t.access = max_t(int, t.access, t.cs_on + gpmc_round_ns_to_ticks(t_ce));
  64         t.access = max_t(int, t.access, t.oe_on + gpmc_round_ns_to_ticks(t_oe));
  65         t.oe_off = t.access + gpmc_round_ns_to_ticks(1);
  66         t.cs_rd_off = t.oe_off;
  67         t.rd_cycle  = t.cs_rd_off + gpmc_round_ns_to_ticks(t_cez);
  68
  69         /* Write */
  70         t.adv_wr_off = t.adv_rd_off;
  71         t.we_on  = t.oe_on;
  72         if (cpu_is_omap34xx()) {
  73                 t.wr_data_mux_bus = t.we_on;
  74                 t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds);
  75         }
  76         t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl);
  77         t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph);
  78         t.wr_cycle  = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez);
  79
  80         /* Configure GPMC for asynchronous read */
  81         gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
  82                           GPMC_CONFIG1_DEVICESIZE_16 |
  83                           GPMC_CONFIG1_MUXADDDATA);
  84
  85         err = gpmc_cs_set_timings(cs, &t);
  86         if (err)
  87                 return err;
  88
  89         /* Ensure sync read and sync write are disabled */
  90         reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
  91         reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE;
  92         writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
  93
  94         return 0;
  95 }
  96
  97 static void set_onenand_cfg(void __iomem *onenand_base, int latency,
  98                                 int sync_read, int sync_write, int hf, int vhf)
  99 {
 100         u32 reg;
 101
 102         reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
 103         reg &= ~((0x7 << ONENAND_SYS_CFG1_BRL_SHIFT) | (0x7 << 9));
 104         reg |=  (latency << ONENAND_SYS_CFG1_BRL_SHIFT) |
 105                 ONENAND_SYS_CFG1_BL_16;
 106         if (sync_read)
 107                 reg |= ONENAND_SYS_CFG1_SYNC_READ;
 108         else
 109                 reg &= ~ONENAND_SYS_CFG1_SYNC_READ;
 110         if (sync_write)
 111                 reg |= ONENAND_SYS_CFG1_SYNC_WRITE;
 112         else
 113                 reg &= ~ONENAND_SYS_CFG1_SYNC_WRITE;
 114         if (hf)
 115                 reg |= ONENAND_SYS_CFG1_HF;
 116         else
 117                 reg &= ~ONENAND_SYS_CFG1_HF;
 118         if (vhf)
 119                 reg |= ONENAND_SYS_CFG1_VHF;
 120         else
 121                 reg &= ~ONENAND_SYS_CFG1_VHF;
 122         writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
 123 }
 124
 125 static int omap2_onenand_get_freq(struct omap_onenand_platform_data *cfg,
 126                                   void __iomem *onenand_base, bool *clk_dep)
 127 {
 128         u16 ver = readw(onenand_base + ONENAND_REG_VERSION_ID);
 129         int freq = 0;
 130
 131         if (cfg->get_freq) {
 132                 struct onenand_freq_info fi;
 133
 134                 fi.maf_id = readw(onenand_base + ONENAND_REG_MANUFACTURER_ID);
 135                 fi.dev_id = readw(onenand_base + ONENAND_REG_DEVICE_ID);
 136                 fi.ver_id = ver;
 137                 freq = cfg->get_freq(&fi, clk_dep);
 138                 if (freq)
 139                         return freq;
 140         }
 141
 142         switch ((ver >> 4) & 0xf) {
 143         case 0:
 144                 freq = 40;
 145                 break;
 146         case 1:
 147                 freq = 54;
 148                 break;
 149         case 2:
 150                 freq = 66;
 151                 break;
 152         case 3:
 153                 freq = 83;
 154                 break;
 155         case 4:
 156                 freq = 104;
 157                 break;
 158         default:
 159                 freq = 54;
 160                 break;
 161         }
 162
 163         return freq;
 164 }
 165
 166 static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
 167                                         void __iomem *onenand_base,
 168                                         int *freq_ptr)
 169 {
 170         struct gpmc_timings t;
 171         const int t_cer  = 15;
 172         const int t_avdp = 12;
 173         const int t_cez  = 20; /* max of t_cez, t_oez */
 174         const int t_ds   = 30;
 175         const int t_wpl  = 40;
 176         const int t_wph  = 30;
 177         int min_gpmc_clk_period, t_ces, t_avds, t_avdh, t_ach, t_aavdh, t_rdyo;
 178         int div, fclk_offset_ns, fclk_offset, gpmc_clk_ns, latency;
 179         int first_time = 0, hf = 0, vhf = 0, sync_read = 0, sync_write = 0;
 180         int err, ticks_cez;
 181         int cs = cfg->cs, freq = *freq_ptr;
 182         u32 reg;
 183         bool clk_dep = false;
 184
 185         if (cfg->flags & ONENAND_SYNC_READ) {
 186                 sync_read = 1;
 187         } else if (cfg->flags & ONENAND_SYNC_READWRITE) {
 188                 sync_read = 1;
 189                 sync_write = 1;
 190         } else
 191                 return omap2_onenand_set_async_mode(cs, onenand_base);
 192
 193         if (!freq) {
 194                 /* Very first call freq is not known */
 195                 err = omap2_onenand_set_async_mode(cs, onenand_base);
 196                 if (err)
 197                         return err;
 198                 freq = omap2_onenand_get_freq(cfg, onenand_base, &clk_dep);
 199                 first_time = 1;
 200         }
 201
 202         switch (freq) {
 203         case 104:
 204                 min_gpmc_clk_period = 9600; /* 104 MHz */
 205                 t_ces   = 3;
 206                 t_avds  = 4;
 207                 t_avdh  = 2;
 208                 t_ach   = 3;
 209                 t_aavdh = 6;
 210                 t_rdyo  = 6;
 211                 break;
 212         case 83:
 213                 min_gpmc_clk_period = 12000; /* 83 MHz */
 214                 t_ces   = 5;
 215                 t_avds  = 4;
 216                 t_avdh  = 2;
 217                 t_ach   = 6;
 218                 t_aavdh = 6;
 219                 t_rdyo  = 9;
 220                 break;
 221         case 66:
 222                 min_gpmc_clk_period = 15000; /* 66 MHz */
 223                 t_ces   = 6;
 224                 t_avds  = 5;
 225                 t_avdh  = 2;
 226                 t_ach   = 6;
 227                 t_aavdh = 6;
 228                 t_rdyo  = 11;
 229                 break;
 230         default:
 231                 min_gpmc_clk_period = 18500; /* 54 MHz */
 232                 t_ces   = 7;
 233                 t_avds  = 7;
 234                 t_avdh  = 7;
 235                 t_ach   = 9;
 236                 t_aavdh = 7;
 237                 t_rdyo  = 15;
 238                 sync_write = 0;
 239                 break;
 240         }
 241
 242         div = gpmc_cs_calc_divider(cs, min_gpmc_clk_period);
 243         gpmc_clk_ns = gpmc_ticks_to_ns(div);
 244         if (gpmc_clk_ns < 15) /* >66Mhz */
 245                 hf = 1;
 246         if (gpmc_clk_ns < 12) /* >83Mhz */
 247                 vhf = 1;
 248         if (vhf)
 249                 latency = 8;
 250         else if (hf)
 251                 latency = 6;
 252         else if (gpmc_clk_ns >= 25) /* 40 MHz*/
 253                 latency = 3;
 254         else
 255                 latency = 4;
 256
 257         if (clk_dep) {
 258                 if (gpmc_clk_ns < 12) { /* >83Mhz */
 259                         t_ces   = 3;
 260                         t_avds  = 4;
 261                 } else if (gpmc_clk_ns < 15) { /* >66Mhz */
 262                         t_ces   = 5;
 263                         t_avds  = 4;
 264                 } else if (gpmc_clk_ns < 25) { /* >40Mhz */
 265                         t_ces   = 6;
 266                         t_avds  = 5;
 267                 } else {
 268                         t_ces   = 7;
 269                         t_avds  = 7;
 270                 }
 271         }
 272
 273         if (first_time)
 274                 set_onenand_cfg(onenand_base, latency,
 275                                         sync_read, sync_write, hf, vhf);
 276
 277         if (div == 1) {
 278                 reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
 279                 reg |= (1 << 7);
 280                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
 281                 reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
 282                 reg |= (1 << 7);
 283                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
 284                 reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
 285                 reg |= (1 << 7);
 286                 reg |= (1 << 23);
 287                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
 288         } else {
 289                 reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
 290                 reg &= ~(1 << 7);
 291                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
 292                 reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
 293                 reg &= ~(1 << 7);
 294                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
 295                 reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
 296                 reg &= ~(1 << 7);
 297                 reg &= ~(1 << 23);
 298                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
 299         }
 300
 301         /* Set synchronous read timings */
 302         memset(&t, 0, sizeof(t));
 303         t.sync_clk = min_gpmc_clk_period;
 304         t.cs_on = 0;
 305         t.adv_on = 0;
 306         fclk_offset_ns = gpmc_round_ns_to_ticks(max_t(int, t_ces, t_avds));
 307         fclk_offset = gpmc_ns_to_ticks(fclk_offset_ns);
 308         t.page_burst_access = gpmc_clk_ns;
 309
 310         /* Read */
 311         t.adv_rd_off = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_avdh));
 312         t.oe_on = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_ach));
 313         /* Force at least 1 clk between AVD High to OE Low */
 314         if (t.oe_on <= t.adv_rd_off)
 315                 t.oe_on = t.adv_rd_off + gpmc_round_ns_to_ticks(1);
 316         t.access = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div);
 317         t.oe_off = t.access + gpmc_round_ns_to_ticks(1);
 318         t.cs_rd_off = t.oe_off;
 319         ticks_cez = ((gpmc_ns_to_ticks(t_cez) + div - 1) / div) * div;
 320         t.rd_cycle = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div +
 321                      ticks_cez);
 322
 323         /* Write */
 324         if (sync_write) {
 325                 t.adv_wr_off = t.adv_rd_off;
 326                 t.we_on  = 0;
 327                 t.we_off = t.cs_rd_off;
 328                 t.cs_wr_off = t.cs_rd_off;
 329                 t.wr_cycle  = t.rd_cycle;
 330                 if (cpu_is_omap34xx()) {
 331                         t.wr_data_mux_bus = gpmc_ticks_to_ns(fclk_offset +
 332                                         gpmc_ps_to_ticks(min_gpmc_clk_period +
 333                                         t_rdyo * 1000));
 334                         t.wr_access = t.access;
 335                 }
 336         } else {
 337                 t.adv_wr_off = gpmc_round_ns_to_ticks(max_t(int,
 338                                                         t_avdp, t_cer));
 339                 t.we_on  = t.adv_wr_off + gpmc_round_ns_to_ticks(t_aavdh);
 340                 t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl);
 341                 t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph);
 342                 t.wr_cycle  = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez);
 343                 if (cpu_is_omap34xx()) {
 344                         t.wr_data_mux_bus = t.we_on;
 345                         t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds);
 346                 }
 347         }
 348
 349         /* Configure GPMC for synchronous read */
 350         gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
 351                           GPMC_CONFIG1_WRAPBURST_SUPP |
 352                           GPMC_CONFIG1_READMULTIPLE_SUPP |
 353                           (sync_read ? GPMC_CONFIG1_READTYPE_SYNC : 0) |
 354                           (sync_write ? GPMC_CONFIG1_WRITEMULTIPLE_SUPP : 0) |
 355                           (sync_write ? GPMC_CONFIG1_WRITETYPE_SYNC : 0) |
 356                           GPMC_CONFIG1_CLKACTIVATIONTIME(fclk_offset) |
 357                           GPMC_CONFIG1_PAGE_LEN(2) |
 358                           (cpu_is_omap34xx() ? 0 :
 359                                 (GPMC_CONFIG1_WAIT_READ_MON |
 360                                  GPMC_CONFIG1_WAIT_PIN_SEL(0))) |
 361                           GPMC_CONFIG1_DEVICESIZE_16 |
 362                           GPMC_CONFIG1_DEVICETYPE_NOR |
 363                           GPMC_CONFIG1_MUXADDDATA);
 364
 365         err = gpmc_cs_set_timings(cs, &t);
 366         if (err)
 367                 return err;
 368
 369         set_onenand_cfg(onenand_base, latency, sync_read, sync_write, hf, vhf);
 370
 371         *freq_ptr = freq;
 372
 373         return 0;
 374 }
 375
 376 static int gpmc_onenand_setup(void __iomem *onenand_base, int *freq_ptr)
 377 {
 378         struct device *dev = &gpmc_onenand_device.dev;
 379
 380         /* Set sync timings in GPMC */
 381         if (omap2_onenand_set_sync_mode(gpmc_onenand_data, onenand_base,
 382                         freq_ptr) < 0) {
 383                 dev_err(dev, "Unable to set synchronous mode\n");
 384                 return -EINVAL;
 385         }
 386
 387         return 0;
 388 }
 389
 390 void __init gpmc_onenand_init(struct omap_onenand_platform_data *_onenand_data)
 391 {
 392         gpmc_onenand_data = _onenand_data;
 393         gpmc_onenand_data->onenand_setup = gpmc_onenand_setup;
 394         gpmc_onenand_device.dev.platform_data = gpmc_onenand_data;
 395
 396         if (cpu_is_omap24xx() &&
 397                         (gpmc_onenand_data->flags & ONENAND_SYNC_READWRITE)) {
 398                 printk(KERN_ERR "Onenand using only SYNC_READ on 24xx\n");
 399                 gpmc_onenand_data->flags &= ~ONENAND_SYNC_READWRITE;
 400                 gpmc_onenand_data->flags |= ONENAND_SYNC_READ;
 401         }
 402
 403         if (platform_device_register(&gpmc_onenand_device) < 0) {
 404                 printk(KERN_ERR "Unable to register OneNAND device\n");
 405                 return;
 406         }
 407 }