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