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