arch/arm/mach-omap2/gpmc.c

   1 /*
   2  * GPMC support functions
   3  *
   4  * Copyright (C) 2005-2006 Nokia Corporation
   5  *
   6  * Author: Juha Yrjola
   7  *
   8  * Copyright (C) 2009 Texas Instruments
   9  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15 #undef DEBUG
  16
  17 #include <linux/irq.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/err.h>
  21 #include <linux/clk.h>
  22 #include <linux/ioport.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/io.h>
  25 #include <linux/module.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/of.h>
  29 #include <linux/of_mtd.h>
  30 #include <linux/of_device.h>
  31 #include <linux/mtd/nand.h>
  32
  33 #include <linux/platform_data/mtd-nand-omap2.h>
  34
  35 #include <asm/mach-types.h>
  36
  37 #include "soc.h"
  38 #include "common.h"
  39 #include "omap_device.h"
  40 #include "gpmc.h"
  41 #include "gpmc-nand.h"
  42 #include "gpmc-onenand.h"
  43
  44 #define DEVICE_NAME             "omap-gpmc"
  45
  46 /* GPMC register offsets */
  47 #define GPMC_REVISION           0x00
  48 #define GPMC_SYSCONFIG          0x10
  49 #define GPMC_SYSSTATUS          0x14
  50 #define GPMC_IRQSTATUS          0x18
  51 #define GPMC_IRQENABLE          0x1c
  52 #define GPMC_TIMEOUT_CONTROL    0x40
  53 #define GPMC_ERR_ADDRESS        0x44
  54 #define GPMC_ERR_TYPE           0x48
  55 #define GPMC_CONFIG             0x50
  56 #define GPMC_STATUS             0x54
  57 #define GPMC_PREFETCH_CONFIG1   0x1e0
  58 #define GPMC_PREFETCH_CONFIG2   0x1e4
  59 #define GPMC_PREFETCH_CONTROL   0x1ec
  60 #define GPMC_PREFETCH_STATUS    0x1f0
  61 #define GPMC_ECC_CONFIG         0x1f4
  62 #define GPMC_ECC_CONTROL        0x1f8
  63 #define GPMC_ECC_SIZE_CONFIG    0x1fc
  64 #define GPMC_ECC1_RESULT        0x200
  65 #define GPMC_ECC_BCH_RESULT_0   0x240   /* not available on OMAP2 */
  66 #define GPMC_ECC_BCH_RESULT_1   0x244   /* not available on OMAP2 */
  67 #define GPMC_ECC_BCH_RESULT_2   0x248   /* not available on OMAP2 */
  68 #define GPMC_ECC_BCH_RESULT_3   0x24c   /* not available on OMAP2 */
  69
  70 /* GPMC ECC control settings */
  71 #define GPMC_ECC_CTRL_ECCCLEAR          0x100
  72 #define GPMC_ECC_CTRL_ECCDISABLE        0x000
  73 #define GPMC_ECC_CTRL_ECCREG1           0x001
  74 #define GPMC_ECC_CTRL_ECCREG2           0x002
  75 #define GPMC_ECC_CTRL_ECCREG3           0x003
  76 #define GPMC_ECC_CTRL_ECCREG4           0x004
  77 #define GPMC_ECC_CTRL_ECCREG5           0x005
  78 #define GPMC_ECC_CTRL_ECCREG6           0x006
  79 #define GPMC_ECC_CTRL_ECCREG7           0x007
  80 #define GPMC_ECC_CTRL_ECCREG8           0x008
  81 #define GPMC_ECC_CTRL_ECCREG9           0x009
  82
  83 #define GPMC_CONFIG2_CSEXTRADELAY               BIT(7)
  84 #define GPMC_CONFIG3_ADVEXTRADELAY              BIT(7)
  85 #define GPMC_CONFIG4_OEEXTRADELAY               BIT(7)
  86 #define GPMC_CONFIG4_WEEXTRADELAY               BIT(23)
  87 #define GPMC_CONFIG6_CYCLE2CYCLEDIFFCSEN        BIT(6)
  88 #define GPMC_CONFIG6_CYCLE2CYCLESAMECSEN        BIT(7)
  89
  90 #define GPMC_CS0_OFFSET         0x60
  91 #define GPMC_CS_SIZE            0x30
  92 #define GPMC_BCH_SIZE           0x10
  93
  94 #define GPMC_MEM_START          0x00000000
  95 #define GPMC_MEM_END            0x3FFFFFFF
  96 #define BOOT_ROM_SPACE          0x100000        /* 1MB */
  97
  98 #define GPMC_CHUNK_SHIFT        24              /* 16 MB */
  99 #define GPMC_SECTION_SHIFT      28              /* 128 MB */
 100
 101 #define CS_NUM_SHIFT            24
 102 #define ENABLE_PREFETCH         (0x1 << 7)
 103 #define DMA_MPU_MODE            2
 104
 105 #define GPMC_REVISION_MAJOR(l)          ((l >> 4) & 0xf)
 106 #define GPMC_REVISION_MINOR(l)          (l & 0xf)
 107
 108 #define GPMC_HAS_WR_ACCESS              0x1
 109 #define GPMC_HAS_WR_DATA_MUX_BUS        0x2
 110
 111 /* XXX: Only NAND irq has been considered,currently these are the only ones used
 112  */
 113 #define GPMC_NR_IRQ             2
 114
 115 struct gpmc_client_irq  {
 116         unsigned                irq;
 117         u32                     bitmask;
 118 };
 119
 120 /* Structure to save gpmc cs context */
 121 struct gpmc_cs_config {
 122         u32 config1;
 123         u32 config2;
 124         u32 config3;
 125         u32 config4;
 126         u32 config5;
 127         u32 config6;
 128         u32 config7;
 129         int is_valid;
 130 };
 131
 132 /*
 133  * Structure to save/restore gpmc context
 134  * to support core off on OMAP3
 135  */
 136 struct omap3_gpmc_regs {
 137         u32 sysconfig;
 138         u32 irqenable;
 139         u32 timeout_ctrl;
 140         u32 config;
 141         u32 prefetch_config1;
 142         u32 prefetch_config2;
 143         u32 prefetch_control;
 144         struct gpmc_cs_config cs_context[GPMC_CS_NUM];
 145 };
 146
 147 static struct gpmc_client_irq gpmc_client_irq[GPMC_NR_IRQ];
 148 static struct irq_chip gpmc_irq_chip;
 149 static unsigned gpmc_irq_start;
 150
 151 static struct resource  gpmc_mem_root;
 152 static struct resource  gpmc_cs_mem[GPMC_CS_NUM];
 153 static DEFINE_SPINLOCK(gpmc_mem_lock);
 154 /* Define chip-selects as reserved by default until probe completes */
 155 static unsigned int gpmc_cs_map = ((1 << GPMC_CS_NUM) - 1);
 156 static struct device *gpmc_dev;
 157 static int gpmc_irq;
 158 static resource_size_t phys_base, mem_size;
 159 static unsigned gpmc_capability;
 160 static void __iomem *gpmc_base;
 161
 162 static struct clk *gpmc_l3_clk;
 163
 164 static irqreturn_t gpmc_handle_irq(int irq, void *dev);
 165
 166 static void gpmc_write_reg(int idx, u32 val)
 167 {
 168         __raw_writel(val, gpmc_base + idx);
 169 }
 170
 171 static u32 gpmc_read_reg(int idx)
 172 {
 173         return __raw_readl(gpmc_base + idx);
 174 }
 175
 176 void gpmc_cs_write_reg(int cs, int idx, u32 val)
 177 {
 178         void __iomem *reg_addr;
 179
 180         reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
 181         __raw_writel(val, reg_addr);
 182 }
 183
 184 u32 gpmc_cs_read_reg(int cs, int idx)
 185 {
 186         void __iomem *reg_addr;
 187
 188         reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
 189         return __raw_readl(reg_addr);
 190 }
 191
 192 /* TODO: Add support for gpmc_fck to clock framework and use it */
 193 unsigned long gpmc_get_fclk_period(void)
 194 {
 195         unsigned long rate = clk_get_rate(gpmc_l3_clk);
 196
 197         if (rate == 0) {
 198                 printk(KERN_WARNING "gpmc_l3_clk not enabled\n");
 199                 return 0;
 200         }
 201
 202         rate /= 1000;
 203         rate = 1000000000 / rate;       /* In picoseconds */
 204
 205         return rate;
 206 }
 207
 208 unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
 209 {
 210         unsigned long tick_ps;
 211
 212         /* Calculate in picosecs to yield more exact results */
 213         tick_ps = gpmc_get_fclk_period();
 214
 215         return (time_ns * 1000 + tick_ps - 1) / tick_ps;
 216 }
 217
 218 unsigned int gpmc_ps_to_ticks(unsigned int time_ps)
 219 {
 220         unsigned long tick_ps;
 221
 222         /* Calculate in picosecs to yield more exact results */
 223         tick_ps = gpmc_get_fclk_period();
 224
 225         return (time_ps + tick_ps - 1) / tick_ps;
 226 }
 227
 228 unsigned int gpmc_ticks_to_ns(unsigned int ticks)
 229 {
 230         return ticks * gpmc_get_fclk_period() / 1000;
 231 }
 232
 233 unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns)
 234 {
 235         unsigned long ticks = gpmc_ns_to_ticks(time_ns);
 236
 237         return ticks * gpmc_get_fclk_period() / 1000;
 238 }
 239
 240 static unsigned int gpmc_ticks_to_ps(unsigned int ticks)
 241 {
 242         return ticks * gpmc_get_fclk_period();
 243 }
 244
 245 static unsigned int gpmc_round_ps_to_ticks(unsigned int time_ps)
 246 {
 247         unsigned long ticks = gpmc_ps_to_ticks(time_ps);
 248
 249         return ticks * gpmc_get_fclk_period();
 250 }
 251
 252 static inline void gpmc_cs_modify_reg(int cs, int reg, u32 mask, bool value)
 253 {
 254         u32 l;
 255
 256         l = gpmc_cs_read_reg(cs, reg);
 257         if (value)
 258                 l |= mask;
 259         else
 260                 l &= ~mask;
 261         gpmc_cs_write_reg(cs, reg, l);
 262 }
 263
 264 static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p)
 265 {
 266         gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG1,
 267                            GPMC_CONFIG1_TIME_PARA_GRAN,
 268                            p->time_para_granularity);
 269         gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG2,
 270                            GPMC_CONFIG2_CSEXTRADELAY, p->cs_extra_delay);
 271         gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG3,
 272                            GPMC_CONFIG3_ADVEXTRADELAY, p->adv_extra_delay);
 273         gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4,
 274                            GPMC_CONFIG4_OEEXTRADELAY, p->oe_extra_delay);
 275         gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4,
 276                            GPMC_CONFIG4_OEEXTRADELAY, p->we_extra_delay);
 277         gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6,
 278                            GPMC_CONFIG6_CYCLE2CYCLESAMECSEN,
 279                            p->cycle2cyclesamecsen);
 280         gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6,
 281                            GPMC_CONFIG6_CYCLE2CYCLEDIFFCSEN,
 282                            p->cycle2cyclediffcsen);
 283 }
 284
 285 #ifdef DEBUG
 286 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
 287                                int time, const char *name)
 288 #else
 289 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
 290                                int time)
 291 #endif
 292 {
 293         u32 l;
 294         int ticks, mask, nr_bits;
 295
 296         if (time == 0)
 297                 ticks = 0;
 298         else
 299                 ticks = gpmc_ns_to_ticks(time);
 300         nr_bits = end_bit - st_bit + 1;
 301         if (ticks >= 1 << nr_bits) {
 302 #ifdef DEBUG
 303                 printk(KERN_INFO "GPMC CS%d: %-10s* %3d ns, %3d ticks >= %d\n",
 304                                 cs, name, time, ticks, 1 << nr_bits);
 305 #endif
 306                 return -1;
 307         }
 308
 309         mask = (1 << nr_bits) - 1;
 310         l = gpmc_cs_read_reg(cs, reg);
 311 #ifdef DEBUG
 312         printk(KERN_INFO
 313                 "GPMC CS%d: %-10s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
 314                cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
 315                         (l >> st_bit) & mask, time);
 316 #endif
 317         l &= ~(mask << st_bit);
 318         l |= ticks << st_bit;
 319         gpmc_cs_write_reg(cs, reg, l);
 320
 321         return 0;
 322 }
 323
 324 #ifdef DEBUG
 325 #define GPMC_SET_ONE(reg, st, end, field) \
 326         if (set_gpmc_timing_reg(cs, (reg), (st), (end),         \
 327                         t->field, #field) < 0)                  \
 328                 return -1
 329 #else
 330 #define GPMC_SET_ONE(reg, st, end, field) \
 331         if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \
 332                 return -1
 333 #endif
 334
 335 int gpmc_calc_divider(unsigned int sync_clk)
 336 {
 337         int div;
 338         u32 l;
 339
 340         l = sync_clk + (gpmc_get_fclk_period() - 1);
 341         div = l / gpmc_get_fclk_period();
 342         if (div > 4)
 343                 return -1;
 344         if (div <= 0)
 345                 div = 1;
 346
 347         return div;
 348 }
 349
 350 int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
 351 {
 352         int div;
 353         u32 l;
 354
 355         div = gpmc_calc_divider(t->sync_clk);
 356         if (div < 0)
 357                 return div;
 358
 359         GPMC_SET_ONE(GPMC_CS_CONFIG2,  0,  3, cs_on);
 360         GPMC_SET_ONE(GPMC_CS_CONFIG2,  8, 12, cs_rd_off);
 361         GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);
 362
 363         GPMC_SET_ONE(GPMC_CS_CONFIG3,  0,  3, adv_on);
 364         GPMC_SET_ONE(GPMC_CS_CONFIG3,  8, 12, adv_rd_off);
 365         GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);
 366
 367         GPMC_SET_ONE(GPMC_CS_CONFIG4,  0,  3, oe_on);
 368         GPMC_SET_ONE(GPMC_CS_CONFIG4,  8, 12, oe_off);
 369         GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
 370         GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);
 371
 372         GPMC_SET_ONE(GPMC_CS_CONFIG5,  0,  4, rd_cycle);
 373         GPMC_SET_ONE(GPMC_CS_CONFIG5,  8, 12, wr_cycle);
 374         GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);
 375
 376         GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);
 377
 378         GPMC_SET_ONE(GPMC_CS_CONFIG6, 0, 3, bus_turnaround);
 379         GPMC_SET_ONE(GPMC_CS_CONFIG6, 8, 11, cycle2cycle_delay);
 380
 381         GPMC_SET_ONE(GPMC_CS_CONFIG1, 18, 19, wait_monitoring);
 382         GPMC_SET_ONE(GPMC_CS_CONFIG1, 25, 26, clk_activation);
 383
 384         if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
 385                 GPMC_SET_ONE(GPMC_CS_CONFIG6, 16, 19, wr_data_mux_bus);
 386         if (gpmc_capability & GPMC_HAS_WR_ACCESS)
 387                 GPMC_SET_ONE(GPMC_CS_CONFIG6, 24, 28, wr_access);
 388
 389         /* caller is expected to have initialized CONFIG1 to cover
 390          * at least sync vs async
 391          */
 392         l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
 393         if (l & (GPMC_CONFIG1_READTYPE_SYNC | GPMC_CONFIG1_WRITETYPE_SYNC)) {
 394 #ifdef DEBUG
 395                 printk(KERN_INFO "GPMC CS%d CLK period is %lu ns (div %d)\n",
 396                                 cs, (div * gpmc_get_fclk_period()) / 1000, div);
 397 #endif
 398                 l &= ~0x03;
 399                 l |= (div - 1);
 400                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
 401         }
 402
 403         gpmc_cs_bool_timings(cs, &t->bool_timings);
 404
 405         return 0;
 406 }
 407
 408 static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
 409 {
 410         u32 l;
 411         u32 mask;
 412
 413         mask = (1 << GPMC_SECTION_SHIFT) - size;
 414         l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
 415         l &= ~0x3f;
 416         l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
 417         l &= ~(0x0f << 8);
 418         l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
 419         l |= GPMC_CONFIG7_CSVALID;
 420         gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
 421 }
 422
 423 static void gpmc_cs_disable_mem(int cs)
 424 {
 425         u32 l;
 426
 427         l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
 428         l &= ~GPMC_CONFIG7_CSVALID;
 429         gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
 430 }
 431
 432 static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size)
 433 {
 434         u32 l;
 435         u32 mask;
 436
 437         l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
 438         *base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
 439         mask = (l >> 8) & 0x0f;
 440         *size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
 441 }
 442
 443 static int gpmc_cs_mem_enabled(int cs)
 444 {
 445         u32 l;
 446
 447         l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
 448         return l & GPMC_CONFIG7_CSVALID;
 449 }
 450
 451 int gpmc_cs_set_reserved(int cs, int reserved)
 452 {
 453         if (cs > GPMC_CS_NUM)
 454                 return -ENODEV;
 455
 456         gpmc_cs_map &= ~(1 << cs);
 457         gpmc_cs_map |= (reserved ? 1 : 0) << cs;
 458
 459         return 0;
 460 }
 461
 462 int gpmc_cs_reserved(int cs)
 463 {
 464         if (cs > GPMC_CS_NUM)
 465                 return -ENODEV;
 466
 467         return gpmc_cs_map & (1 << cs);
 468 }
 469
 470 static unsigned long gpmc_mem_align(unsigned long size)
 471 {
 472         int order;
 473
 474         size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
 475         order = GPMC_CHUNK_SHIFT - 1;
 476         do {
 477                 size >>= 1;
 478                 order++;
 479         } while (size);
 480         size = 1 << order;
 481         return size;
 482 }
 483
 484 static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
 485 {
 486         struct resource *res = &gpmc_cs_mem[cs];
 487         int r;
 488
 489         size = gpmc_mem_align(size);
 490         spin_lock(&gpmc_mem_lock);
 491         res->start = base;
 492         res->end = base + size - 1;
 493         r = request_resource(&gpmc_mem_root, res);
 494         spin_unlock(&gpmc_mem_lock);
 495
 496         return r;
 497 }
 498
 499 static int gpmc_cs_delete_mem(int cs)
 500 {
 501         struct resource *res = &gpmc_cs_mem[cs];
 502         int r;
 503
 504         spin_lock(&gpmc_mem_lock);
 505         r = release_resource(&gpmc_cs_mem[cs]);
 506         res->start = 0;
 507         res->end = 0;
 508         spin_unlock(&gpmc_mem_lock);
 509
 510         return r;
 511 }
 512
 513 int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
 514 {
 515         struct resource *res = &gpmc_cs_mem[cs];
 516         int r = -1;
 517
 518         if (cs > GPMC_CS_NUM)
 519                 return -ENODEV;
 520
 521         size = gpmc_mem_align(size);
 522         if (size > (1 << GPMC_SECTION_SHIFT))
 523                 return -ENOMEM;
 524
 525         spin_lock(&gpmc_mem_lock);
 526         if (gpmc_cs_reserved(cs)) {
 527                 r = -EBUSY;
 528                 goto out;
 529         }
 530         if (gpmc_cs_mem_enabled(cs))
 531                 r = adjust_resource(res, res->start & ~(size - 1), size);
 532         if (r < 0)
 533                 r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
 534                                       size, NULL, NULL);
 535         if (r < 0)
 536                 goto out;
 537
 538         gpmc_cs_enable_mem(cs, res->start, resource_size(res));
 539         *base = res->start;
 540         gpmc_cs_set_reserved(cs, 1);
 541 out:
 542         spin_unlock(&gpmc_mem_lock);
 543         return r;
 544 }
 545 EXPORT_SYMBOL(gpmc_cs_request);
 546
 547 void gpmc_cs_free(int cs)
 548 {
 549         spin_lock(&gpmc_mem_lock);
 550         if (cs >= GPMC_CS_NUM || cs < 0 || !gpmc_cs_reserved(cs)) {
 551                 printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
 552                 BUG();
 553                 spin_unlock(&gpmc_mem_lock);
 554                 return;
 555         }
 556         gpmc_cs_disable_mem(cs);
 557         release_resource(&gpmc_cs_mem[cs]);
 558         gpmc_cs_set_reserved(cs, 0);
 559         spin_unlock(&gpmc_mem_lock);
 560 }
 561 EXPORT_SYMBOL(gpmc_cs_free);
 562
 563 /**
 564  * gpmc_cs_configure - write request to configure gpmc
 565  * @cs: chip select number
 566  * @cmd: command type
 567  * @wval: value to write
 568  * @return status of the operation
 569  */
 570 int gpmc_cs_configure(int cs, int cmd, int wval)
 571 {
 572         int err = 0;
 573         u32 regval = 0;
 574
 575         switch (cmd) {
 576         case GPMC_ENABLE_IRQ:
 577                 gpmc_write_reg(GPMC_IRQENABLE, wval);
 578                 break;
 579
 580         case GPMC_SET_IRQ_STATUS:
 581                 gpmc_write_reg(GPMC_IRQSTATUS, wval);
 582                 break;
 583
 584         case GPMC_CONFIG_WP:
 585                 regval = gpmc_read_reg(GPMC_CONFIG);
 586                 if (wval)
 587                         regval &= ~GPMC_CONFIG_WRITEPROTECT; /* WP is ON */
 588                 else
 589                         regval |= GPMC_CONFIG_WRITEPROTECT;  /* WP is OFF */
 590                 gpmc_write_reg(GPMC_CONFIG, regval);
 591                 break;
 592
 593         case GPMC_CONFIG_RDY_BSY:
 594                 regval  = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
 595                 if (wval)
 596                         regval |= WR_RD_PIN_MONITORING;
 597                 else
 598                         regval &= ~WR_RD_PIN_MONITORING;
 599                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
 600                 break;
 601
 602         case GPMC_CONFIG_DEV_SIZE:
 603                 regval  = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
 604
 605                 /* clear 2 target bits */
 606                 regval &= ~GPMC_CONFIG1_DEVICESIZE(3);
 607
 608                 /* set the proper value */
 609                 regval |= GPMC_CONFIG1_DEVICESIZE(wval);
 610
 611                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
 612                 break;
 613
 614         case GPMC_CONFIG_DEV_TYPE:
 615                 regval  = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
 616                 regval |= GPMC_CONFIG1_DEVICETYPE(wval);
 617                 if (wval == GPMC_DEVICETYPE_NOR)
 618                         regval |= GPMC_CONFIG1_MUXADDDATA;
 619                 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
 620                 break;
 621
 622         default:
 623                 printk(KERN_ERR "gpmc_configure_cs: Not supported\n");
 624                 err = -EINVAL;
 625         }
 626
 627         return err;
 628 }
 629 EXPORT_SYMBOL(gpmc_cs_configure);
 630
 631 void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs)
 632 {
 633         int i;
 634
 635         reg->gpmc_status = gpmc_base + GPMC_STATUS;
 636         reg->gpmc_nand_command = gpmc_base + GPMC_CS0_OFFSET +
 637                                 GPMC_CS_NAND_COMMAND + GPMC_CS_SIZE * cs;
 638         reg->gpmc_nand_address = gpmc_base + GPMC_CS0_OFFSET +
 639                                 GPMC_CS_NAND_ADDRESS + GPMC_CS_SIZE * cs;
 640         reg->gpmc_nand_data = gpmc_base + GPMC_CS0_OFFSET +
 641                                 GPMC_CS_NAND_DATA + GPMC_CS_SIZE * cs;
 642         reg->gpmc_prefetch_config1 = gpmc_base + GPMC_PREFETCH_CONFIG1;
 643         reg->gpmc_prefetch_config2 = gpmc_base + GPMC_PREFETCH_CONFIG2;
 644         reg->gpmc_prefetch_control = gpmc_base + GPMC_PREFETCH_CONTROL;
 645         reg->gpmc_prefetch_status = gpmc_base + GPMC_PREFETCH_STATUS;
 646         reg->gpmc_ecc_config = gpmc_base + GPMC_ECC_CONFIG;
 647         reg->gpmc_ecc_control = gpmc_base + GPMC_ECC_CONTROL;
 648         reg->gpmc_ecc_size_config = gpmc_base + GPMC_ECC_SIZE_CONFIG;
 649         reg->gpmc_ecc1_result = gpmc_base + GPMC_ECC1_RESULT;
 650
 651         for (i = 0; i < GPMC_BCH_NUM_REMAINDER; i++) {
 652                 reg->gpmc_bch_result0[i] = gpmc_base + GPMC_ECC_BCH_RESULT_0 +
 653                                            GPMC_BCH_SIZE * i;
 654                 reg->gpmc_bch_result1[i] = gpmc_base + GPMC_ECC_BCH_RESULT_1 +
 655                                            GPMC_BCH_SIZE * i;
 656                 reg->gpmc_bch_result2[i] = gpmc_base + GPMC_ECC_BCH_RESULT_2 +
 657                                            GPMC_BCH_SIZE * i;
 658                 reg->gpmc_bch_result3[i] = gpmc_base + GPMC_ECC_BCH_RESULT_3 +
 659                                            GPMC_BCH_SIZE * i;
 660         }
 661 }
 662
 663 int gpmc_get_client_irq(unsigned irq_config)
 664 {
 665         int i;
 666
 667         if (hweight32(irq_config) > 1)
 668                 return 0;
 669
 670         for (i = 0; i < GPMC_NR_IRQ; i++)
 671                 if (gpmc_client_irq[i].bitmask & irq_config)
 672                         return gpmc_client_irq[i].irq;
 673
 674         return 0;
 675 }
 676
 677 static int gpmc_irq_endis(unsigned irq, bool endis)
 678 {
 679         int i;
 680         u32 regval;
 681
 682         for (i = 0; i < GPMC_NR_IRQ; i++)
 683                 if (irq == gpmc_client_irq[i].irq) {
 684                         regval = gpmc_read_reg(GPMC_IRQENABLE);
 685                         if (endis)
 686                                 regval |= gpmc_client_irq[i].bitmask;
 687                         else
 688                                 regval &= ~gpmc_client_irq[i].bitmask;
 689                         gpmc_write_reg(GPMC_IRQENABLE, regval);
 690                         break;
 691                 }
 692
 693         return 0;
 694 }
 695
 696 static void gpmc_irq_disable(struct irq_data *p)
 697 {
 698         gpmc_irq_endis(p->irq, false);
 699 }
 700
 701 static void gpmc_irq_enable(struct irq_data *p)
 702 {
 703         gpmc_irq_endis(p->irq, true);
 704 }
 705
 706 static void gpmc_irq_noop(struct irq_data *data) { }
 707
 708 static unsigned int gpmc_irq_noop_ret(struct irq_data *data) { return 0; }
 709
 710 static int gpmc_setup_irq(void)
 711 {
 712         int i;
 713         u32 regval;
 714
 715         if (!gpmc_irq)
 716                 return -EINVAL;
 717
 718         gpmc_irq_start = irq_alloc_descs(-1, 0, GPMC_NR_IRQ, 0);
 719         if (IS_ERR_VALUE(gpmc_irq_start)) {
 720                 pr_err("irq_alloc_descs failed\n");
 721                 return gpmc_irq_start;
 722         }
 723
 724         gpmc_irq_chip.name = "gpmc";
 725         gpmc_irq_chip.irq_startup = gpmc_irq_noop_ret;
 726         gpmc_irq_chip.irq_enable = gpmc_irq_enable;
 727         gpmc_irq_chip.irq_disable = gpmc_irq_disable;
 728         gpmc_irq_chip.irq_shutdown = gpmc_irq_noop;
 729         gpmc_irq_chip.irq_ack = gpmc_irq_noop;
 730         gpmc_irq_chip.irq_mask = gpmc_irq_noop;
 731         gpmc_irq_chip.irq_unmask = gpmc_irq_noop;
 732
 733         gpmc_client_irq[0].bitmask = GPMC_IRQ_FIFOEVENTENABLE;
 734         gpmc_client_irq[1].bitmask = GPMC_IRQ_COUNT_EVENT;
 735
 736         for (i = 0; i < GPMC_NR_IRQ; i++) {
 737                 gpmc_client_irq[i].irq = gpmc_irq_start + i;
 738                 irq_set_chip_and_handler(gpmc_client_irq[i].irq,
 739                                         &gpmc_irq_chip, handle_simple_irq);
 740                 set_irq_flags(gpmc_client_irq[i].irq,
 741                                 IRQF_VALID | IRQF_NOAUTOEN);
 742         }
 743
 744         /* Disable interrupts */
 745         gpmc_write_reg(GPMC_IRQENABLE, 0);
 746
 747         /* clear interrupts */
 748         regval = gpmc_read_reg(GPMC_IRQSTATUS);
 749         gpmc_write_reg(GPMC_IRQSTATUS, regval);
 750
 751         return request_irq(gpmc_irq, gpmc_handle_irq, 0, "gpmc", NULL);
 752 }
 753
 754 static int gpmc_free_irq(void)
 755 {
 756         int i;
 757
 758         if (gpmc_irq)
 759                 free_irq(gpmc_irq, NULL);
 760
 761         for (i = 0; i < GPMC_NR_IRQ; i++) {
 762                 irq_set_handler(gpmc_client_irq[i].irq, NULL);
 763                 irq_set_chip(gpmc_client_irq[i].irq, &no_irq_chip);
 764                 irq_modify_status(gpmc_client_irq[i].irq, 0, 0);
 765         }
 766
 767         irq_free_descs(gpmc_irq_start, GPMC_NR_IRQ);
 768
 769         return 0;
 770 }
 771
 772 static void gpmc_mem_exit(void)
 773 {
 774         int cs;
 775
 776         for (cs = 0; cs < GPMC_CS_NUM; cs++) {
 777                 if (!gpmc_cs_mem_enabled(cs))
 778                         continue;
 779                 gpmc_cs_delete_mem(cs);
 780         }
 781
 782 }
 783
 784 static int gpmc_mem_init(void)
 785 {
 786         int cs, rc;
 787         unsigned long boot_rom_space = 0;
 788
 789         /* never allocate the first page, to facilitate bug detection;
 790          * even if we didn't boot from ROM.
 791          */
 792         boot_rom_space = BOOT_ROM_SPACE;
 793         gpmc_mem_root.start = GPMC_MEM_START + boot_rom_space;
 794         gpmc_mem_root.end = GPMC_MEM_END;
 795
 796         /* Reserve all regions that has been set up by bootloader */
 797         for (cs = 0; cs < GPMC_CS_NUM; cs++) {
 798                 u32 base, size;
 799
 800                 if (!gpmc_cs_mem_enabled(cs))
 801                         continue;
 802                 gpmc_cs_get_memconf(cs, &base, &size);
 803                 rc = gpmc_cs_insert_mem(cs, base, size);
 804                 if (IS_ERR_VALUE(rc)) {
 805                         while (--cs >= 0)
 806                                 if (gpmc_cs_mem_enabled(cs))
 807                                         gpmc_cs_delete_mem(cs);
 808                         return rc;
 809                 }
 810         }
 811
 812         return 0;
 813 }
 814
 815 static u32 gpmc_round_ps_to_sync_clk(u32 time_ps, u32 sync_clk)
 816 {
 817         u32 temp;
 818         int div;
 819
 820         div = gpmc_calc_divider(sync_clk);
 821         temp = gpmc_ps_to_ticks(time_ps);
 822         temp = (temp + div - 1) / div;
 823         return gpmc_ticks_to_ps(temp * div);
 824 }
 825
 826 /* XXX: can the cycles be avoided ? */
 827 static int gpmc_calc_sync_read_timings(struct gpmc_timings *gpmc_t,
 828                                 struct gpmc_device_timings *dev_t)
 829 {
 830         bool mux = dev_t->mux;
 831         u32 temp;
 832
 833         /* adv_rd_off */
 834         temp = dev_t->t_avdp_r;
 835         /* XXX: mux check required ? */
 836         if (mux) {
 837                 /* XXX: t_avdp not to be required for sync, only added for tusb
 838                  * this indirectly necessitates requirement of t_avdp_r and
 839                  * t_avdp_w instead of having a single t_avdp
 840                  */
 841                 temp = max_t(u32, temp, gpmc_t->clk_activation + dev_t->t_avdh);
 842                 temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
 843         }
 844         gpmc_t->adv_rd_off = gpmc_round_ps_to_ticks(temp);
 845
 846         /* oe_on */
 847         temp = dev_t->t_oeasu; /* XXX: remove this ? */
 848         if (mux) {
 849                 temp = max_t(u32, temp, gpmc_t->clk_activation + dev_t->t_ach);
 850                 temp = max_t(u32, temp, gpmc_t->adv_rd_off +
 851                                 gpmc_ticks_to_ps(dev_t->cyc_aavdh_oe));
 852         }
 853         gpmc_t->oe_on = gpmc_round_ps_to_ticks(temp);
 854
 855         /* access */
 856         /* XXX: any scope for improvement ?, by combining oe_on
 857          * and clk_activation, need to check whether
 858          * access = clk_activation + round to sync clk ?
 859          */
 860         temp = max_t(u32, dev_t->t_iaa, dev_t->cyc_iaa * gpmc_t->sync_clk);
 861         temp += gpmc_t->clk_activation;
 862         if (dev_t->cyc_oe)
 863                 temp = max_t(u32, temp, gpmc_t->oe_on +
 864                                 gpmc_ticks_to_ps(dev_t->cyc_oe));
 865         gpmc_t->access = gpmc_round_ps_to_ticks(temp);
 866
 867         gpmc_t->oe_off = gpmc_t->access + gpmc_ticks_to_ps(1);
 868         gpmc_t->cs_rd_off = gpmc_t->oe_off;
 869
 870         /* rd_cycle */
 871         temp = max_t(u32, dev_t->t_cez_r, dev_t->t_oez);
 872         temp = gpmc_round_ps_to_sync_clk(temp, gpmc_t->sync_clk) +
 873                                                         gpmc_t->access;
 874         /* XXX: barter t_ce_rdyz with t_cez_r ? */
 875         if (dev_t->t_ce_rdyz)
 876                 temp = max_t(u32, temp, gpmc_t->cs_rd_off + dev_t->t_ce_rdyz);
 877         gpmc_t->rd_cycle = gpmc_round_ps_to_ticks(temp);
 878
 879         return 0;
 880 }
 881
 882 static int gpmc_calc_sync_write_timings(struct gpmc_timings *gpmc_t,
 883                                 struct gpmc_device_timings *dev_t)
 884 {
 885         bool mux = dev_t->mux;
 886         u32 temp;
 887
 888         /* adv_wr_off */
 889         temp = dev_t->t_avdp_w;
 890         if (mux) {
 891                 temp = max_t(u32, temp,
 892                         gpmc_t->clk_activation + dev_t->t_avdh);
 893                 temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
 894         }
 895         gpmc_t->adv_wr_off = gpmc_round_ps_to_ticks(temp);
 896
 897         /* wr_data_mux_bus */
 898         temp = max_t(u32, dev_t->t_weasu,
 899                         gpmc_t->clk_activation + dev_t->t_rdyo);
 900         /* XXX: shouldn't mux be kept as a whole for wr_data_mux_bus ?,
 901          * and in that case remember to handle we_on properly
 902          */
 903         if (mux) {
 904                 temp = max_t(u32, temp,
 905                         gpmc_t->adv_wr_off + dev_t->t_aavdh);
 906                 temp = max_t(u32, temp, gpmc_t->adv_wr_off +
 907                                 gpmc_ticks_to_ps(dev_t->cyc_aavdh_we));
 908         }
 909         gpmc_t->wr_data_mux_bus = gpmc_round_ps_to_ticks(temp);
 910
 911         /* we_on */
 912         if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
 913                 gpmc_t->we_on = gpmc_round_ps_to_ticks(dev_t->t_weasu);
 914         else
 915                 gpmc_t->we_on = gpmc_t->wr_data_mux_bus;
 916
 917         /* wr_access */
 918         /* XXX: gpmc_capability check reqd ? , even if not, will not harm */
 919         gpmc_t->wr_access = gpmc_t->access;
 920
 921         /* we_off */
 922         temp = gpmc_t->we_on + dev_t->t_wpl;
 923         temp = max_t(u32, temp,
 924                         gpmc_t->wr_access + gpmc_ticks_to_ps(1));
 925         temp = max_t(u32, temp,
 926                 gpmc_t->we_on + gpmc_ticks_to_ps(dev_t->cyc_wpl));
 927         gpmc_t->we_off = gpmc_round_ps_to_ticks(temp);
 928
 929         gpmc_t->cs_wr_off = gpmc_round_ps_to_ticks(gpmc_t->we_off +
 930                                                         dev_t->t_wph);
 931
 932         /* wr_cycle */
 933         temp = gpmc_round_ps_to_sync_clk(dev_t->t_cez_w, gpmc_t->sync_clk);
 934         temp += gpmc_t->wr_access;
 935         /* XXX: barter t_ce_rdyz with t_cez_w ? */
 936         if (dev_t->t_ce_rdyz)
 937                 temp = max_t(u32, temp,
 938                                  gpmc_t->cs_wr_off + dev_t->t_ce_rdyz);
 939         gpmc_t->wr_cycle = gpmc_round_ps_to_ticks(temp);
 940
 941         return 0;
 942 }
 943
 944 static int gpmc_calc_async_read_timings(struct gpmc_timings *gpmc_t,
 945                                 struct gpmc_device_timings *dev_t)
 946 {
 947         bool mux = dev_t->mux;
 948         u32 temp;
 949
 950         /* adv_rd_off */
 951         temp = dev_t->t_avdp_r;
 952         if (mux)
 953                 temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
 954         gpmc_t->adv_rd_off = gpmc_round_ps_to_ticks(temp);
 955
 956         /* oe_on */
 957         temp = dev_t->t_oeasu;
 958         if (mux)
 959                 temp = max_t(u32, temp,
 960                         gpmc_t->adv_rd_off + dev_t->t_aavdh);
 961         gpmc_t->oe_on = gpmc_round_ps_to_ticks(temp);
 962
 963         /* access */
 964         temp = max_t(u32, dev_t->t_iaa, /* XXX: remove t_iaa in async ? */
 965                                 gpmc_t->oe_on + dev_t->t_oe);
 966         temp = max_t(u32, temp,
 967                                 gpmc_t->cs_on + dev_t->t_ce);
 968         temp = max_t(u32, temp,
 969                                 gpmc_t->adv_on + dev_t->t_aa);
 970         gpmc_t->access = gpmc_round_ps_to_ticks(temp);
 971
 972         gpmc_t->oe_off = gpmc_t->access + gpmc_ticks_to_ps(1);
 973         gpmc_t->cs_rd_off = gpmc_t->oe_off;
 974
 975         /* rd_cycle */
 976         temp = max_t(u32, dev_t->t_rd_cycle,
 977                         gpmc_t->cs_rd_off + dev_t->t_cez_r);
 978         temp = max_t(u32, temp, gpmc_t->oe_off + dev_t->t_oez);
 979         gpmc_t->rd_cycle = gpmc_round_ps_to_ticks(temp);
 980
 981         return 0;
 982 }
 983
 984 static int gpmc_calc_async_write_timings(struct gpmc_timings *gpmc_t,
 985                                 struct gpmc_device_timings *dev_t)
 986 {
 987         bool mux = dev_t->mux;
 988         u32 temp;
 989
 990         /* adv_wr_off */
 991         temp = dev_t->t_avdp_w;
 992         if (mux)
 993                 temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
 994         gpmc_t->adv_wr_off = gpmc_round_ps_to_ticks(temp);
 995
 996         /* wr_data_mux_bus */
 997         temp = dev_t->t_weasu;
 998         if (mux) {
 999                 temp = max_t(u32, temp, gpmc_t->adv_wr_off + dev_t->t_aavdh);
1000                 temp = max_t(u32, temp, gpmc_t->adv_wr_off +
1001                                 gpmc_ticks_to_ps(dev_t->cyc_aavdh_we));
1002         }
1003         gpmc_t->wr_data_mux_bus = gpmc_round_ps_to_ticks(temp);
1004
1005         /* we_on */
1006         if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
1007                 gpmc_t->we_on = gpmc_round_ps_to_ticks(dev_t->t_weasu);
1008         else
1009                 gpmc_t->we_on = gpmc_t->wr_data_mux_bus;
1010
1011         /* we_off */
1012         temp = gpmc_t->we_on + dev_t->t_wpl;
1013         gpmc_t->we_off = gpmc_round_ps_to_ticks(temp);
1014
1015         gpmc_t->cs_wr_off = gpmc_round_ps_to_ticks(gpmc_t->we_off +
1016                                                         dev_t->t_wph);
1017
1018         /* wr_cycle */
1019         temp = max_t(u32, dev_t->t_wr_cycle,
1020                                 gpmc_t->cs_wr_off + dev_t->t_cez_w);
1021         gpmc_t->wr_cycle = gpmc_round_ps_to_ticks(temp);
1022
1023         return 0;
1024 }
1025
1026 static int gpmc_calc_sync_common_timings(struct gpmc_timings *gpmc_t,
1027                         struct gpmc_device_timings *dev_t)
1028 {
1029         u32 temp;
1030
1031         gpmc_t->sync_clk = gpmc_calc_divider(dev_t->clk) *
1032                                                 gpmc_get_fclk_period();
1033
1034         gpmc_t->page_burst_access = gpmc_round_ps_to_sync_clk(
1035                                         dev_t->t_bacc,
1036                                         gpmc_t->sync_clk);
1037
1038         temp = max_t(u32, dev_t->t_ces, dev_t->t_avds);
1039         gpmc_t->clk_activation = gpmc_round_ps_to_ticks(temp);
1040
1041         if (gpmc_calc_divider(gpmc_t->sync_clk) != 1)
1042                 return 0;
1043
1044         if (dev_t->ce_xdelay)
1045                 gpmc_t->bool_timings.cs_extra_delay = true;
1046         if (dev_t->avd_xdelay)
1047                 gpmc_t->bool_timings.adv_extra_delay = true;
1048         if (dev_t->oe_xdelay)
1049                 gpmc_t->bool_timings.oe_extra_delay = true;
1050         if (dev_t->we_xdelay)
1051                 gpmc_t->bool_timings.we_extra_delay = true;
1052
1053         return 0;
1054 }
1055
1056 static int gpmc_calc_common_timings(struct gpmc_timings *gpmc_t,
1057                         struct gpmc_device_timings *dev_t)
1058 {
1059         u32 temp;
1060
1061         /* cs_on */
1062         gpmc_t->cs_on = gpmc_round_ps_to_ticks(dev_t->t_ceasu);
1063
1064         /* adv_on */
1065         temp = dev_t->t_avdasu;
1066         if (dev_t->t_ce_avd)
1067                 temp = max_t(u32, temp,
1068                                 gpmc_t->cs_on + dev_t->t_ce_avd);
1069         gpmc_t->adv_on = gpmc_round_ps_to_ticks(temp);
1070
1071         if (dev_t->sync_write || dev_t->sync_read)
1072                 gpmc_calc_sync_common_timings(gpmc_t, dev_t);
1073
1074         return 0;
1075 }
1076
1077 /* TODO: remove this function once all peripherals are confirmed to
1078  * work with generic timing. Simultaneously gpmc_cs_set_timings()
1079  * has to be modified to handle timings in ps instead of ns
1080 */
1081 static void gpmc_convert_ps_to_ns(struct gpmc_timings *t)
1082 {
1083         t->cs_on /= 1000;
1084         t->cs_rd_off /= 1000;
1085         t->cs_wr_off /= 1000;
1086         t->adv_on /= 1000;
1087         t->adv_rd_off /= 1000;
1088         t->adv_wr_off /= 1000;
1089         t->we_on /= 1000;
1090         t->we_off /= 1000;
1091         t->oe_on /= 1000;
1092         t->oe_off /= 1000;
1093         t->page_burst_access /= 1000;
1094         t->access /= 1000;
1095         t->rd_cycle /= 1000;
1096         t->wr_cycle /= 1000;
1097         t->bus_turnaround /= 1000;
1098         t->cycle2cycle_delay /= 1000;
1099         t->wait_monitoring /= 1000;
1100         t->clk_activation /= 1000;
1101         t->wr_access /= 1000;
1102         t->wr_data_mux_bus /= 1000;
1103 }
1104
1105 int gpmc_calc_timings(struct gpmc_timings *gpmc_t,
1106                         struct gpmc_device_timings *dev_t)
1107 {
1108         memset(gpmc_t, 0, sizeof(*gpmc_t));
1109
1110         gpmc_calc_common_timings(gpmc_t, dev_t);
1111
1112         if (dev_t->sync_read)
1113                 gpmc_calc_sync_read_timings(gpmc_t, dev_t);
1114         else
1115                 gpmc_calc_async_read_timings(gpmc_t, dev_t);
1116
1117         if (dev_t->sync_write)
1118                 gpmc_calc_sync_write_timings(gpmc_t, dev_t);
1119         else
1120                 gpmc_calc_async_write_timings(gpmc_t, dev_t);
1121
1122         /* TODO: remove, see function definition */
1123         gpmc_convert_ps_to_ns(gpmc_t);
1124
1125         return 0;
1126 }
1127
1128 #ifdef CONFIG_OF
1129 static struct of_device_id gpmc_dt_ids[] = {
1130         { .compatible = "ti,omap2420-gpmc" },
1131         { .compatible = "ti,omap2430-gpmc" },
1132         { .compatible = "ti,omap3430-gpmc" },   /* omap3430 & omap3630 */
1133         { .compatible = "ti,omap4430-gpmc" },   /* omap4430 & omap4460 & omap543x */
1134         { .compatible = "ti,am3352-gpmc" },     /* am335x devices */
1135         { }
1136 };
1137 MODULE_DEVICE_TABLE(of, gpmc_dt_ids);
1138
1139 static void __maybe_unused gpmc_read_timings_dt(struct device_node *np,
1140                                                 struct gpmc_timings *gpmc_t)
1141 {
1142         u32 val;
1143
1144         memset(gpmc_t, 0, sizeof(*gpmc_t));
1145
1146         /* minimum clock period for syncronous mode */
1147         if (!of_property_read_u32(np, "gpmc,sync-clk", &val))
1148                 gpmc_t->sync_clk = val;
1149
1150         /* chip select timtings */
1151         if (!of_property_read_u32(np, "gpmc,cs-on", &val))
1152                 gpmc_t->cs_on = val;
1153
1154         if (!of_property_read_u32(np, "gpmc,cs-rd-off", &val))
1155                 gpmc_t->cs_rd_off = val;
1156
1157         if (!of_property_read_u32(np, "gpmc,cs-wr-off", &val))
1158                 gpmc_t->cs_wr_off = val;
1159
1160         /* ADV signal timings */
1161         if (!of_property_read_u32(np, "gpmc,adv-on", &val))
1162                 gpmc_t->adv_on = val;
1163
1164         if (!of_property_read_u32(np, "gpmc,adv-rd-off", &val))
1165                 gpmc_t->adv_rd_off = val;
1166
1167         if (!of_property_read_u32(np, "gpmc,adv-wr-off", &val))
1168                 gpmc_t->adv_wr_off = val;
1169
1170         /* WE signal timings */
1171         if (!of_property_read_u32(np, "gpmc,we-on", &val))
1172                 gpmc_t->we_on = val;
1173
1174         if (!of_property_read_u32(np, "gpmc,we-off", &val))
1175                 gpmc_t->we_off = val;
1176
1177         /* OE signal timings */
1178         if (!of_property_read_u32(np, "gpmc,oe-on", &val))
1179                 gpmc_t->oe_on = val;
1180
1181         if (!of_property_read_u32(np, "gpmc,oe-off", &val))
1182                 gpmc_t->oe_off = val;
1183
1184         /* access and cycle timings */
1185         if (!of_property_read_u32(np, "gpmc,page-burst-access", &val))
1186                 gpmc_t->page_burst_access = val;
1187
1188         if (!of_property_read_u32(np, "gpmc,access", &val))
1189                 gpmc_t->access = val;
1190
1191         if (!of_property_read_u32(np, "gpmc,rd-cycle", &val))
1192                 gpmc_t->rd_cycle = val;
1193
1194         if (!of_property_read_u32(np, "gpmc,wr-cycle", &val))
1195                 gpmc_t->wr_cycle = val;
1196
1197         /* only for OMAP3430 */
1198         if (!of_property_read_u32(np, "gpmc,wr-access", &val))
1199                 gpmc_t->wr_access = val;
1200
1201         if (!of_property_read_u32(np, "gpmc,wr-data-mux-bus", &val))
1202                 gpmc_t->wr_data_mux_bus = val;
1203 }
1204
1205 #ifdef CONFIG_MTD_NAND
1206
1207 static const char * const nand_ecc_opts[] = {
1208         [OMAP_ECC_HAMMING_CODE_DEFAULT]         = "sw",
1209         [OMAP_ECC_HAMMING_CODE_HW]              = "hw",
1210         [OMAP_ECC_HAMMING_CODE_HW_ROMCODE]      = "hw-romcode",
1211         [OMAP_ECC_BCH4_CODE_HW]                 = "bch4",
1212         [OMAP_ECC_BCH8_CODE_HW]                 = "bch8",
1213 };
1214
1215 static int gpmc_probe_nand_child(struct platform_device *pdev,
1216                                  struct device_node *child)
1217 {
1218         u32 val;
1219         const char *s;
1220         struct gpmc_timings gpmc_t;
1221         struct omap_nand_platform_data *gpmc_nand_data;
1222
1223         if (of_property_read_u32(child, "reg", &val) < 0) {
1224                 dev_err(&pdev->dev, "%s has no 'reg' property\n",
1225                         child->full_name);
1226                 return -ENODEV;
1227         }
1228
1229         gpmc_nand_data = devm_kzalloc(&pdev->dev, sizeof(*gpmc_nand_data),
1230                                       GFP_KERNEL);
1231         if (!gpmc_nand_data)
1232                 return -ENOMEM;
1233
1234         gpmc_nand_data->cs = val;
1235         gpmc_nand_data->of_node = child;
1236
1237         if (!of_property_read_string(child, "ti,nand-ecc-opt", &s))
1238                 for (val = 0; val < ARRAY_SIZE(nand_ecc_opts); val++)
1239                         if (!strcasecmp(s, nand_ecc_opts[val])) {
1240                                 gpmc_nand_data->ecc_opt = val;
1241                                 break;
1242                         }
1243
1244         val = of_get_nand_bus_width(child);
1245         if (val == 16)
1246                 gpmc_nand_data->devsize = NAND_BUSWIDTH_16;
1247
1248         gpmc_read_timings_dt(child, &gpmc_t);
1249         gpmc_nand_init(gpmc_nand_data, &gpmc_t);
1250
1251         return 0;
1252 }
1253 #else
1254 static int gpmc_probe_nand_child(struct platform_device *pdev,
1255                                  struct device_node *child)
1256 {
1257         return 0;
1258 }
1259 #endif
1260
1261 #ifdef CONFIG_MTD_ONENAND
1262 static int gpmc_probe_onenand_child(struct platform_device *pdev,
1263                                  struct device_node *child)
1264 {
1265         u32 val;
1266         struct omap_onenand_platform_data *gpmc_onenand_data;
1267
1268         if (of_property_read_u32(child, "reg", &val) < 0) {
1269                 dev_err(&pdev->dev, "%s has no 'reg' property\n",
1270                         child->full_name);
1271                 return -ENODEV;
1272         }
1273
1274         gpmc_onenand_data = devm_kzalloc(&pdev->dev, sizeof(*gpmc_onenand_data),
1275                                          GFP_KERNEL);
1276         if (!gpmc_onenand_data)
1277                 return -ENOMEM;
1278
1279         gpmc_onenand_data->cs = val;
1280         gpmc_onenand_data->of_node = child;
1281         gpmc_onenand_data->dma_channel = -1;
1282
1283         if (!of_property_read_u32(child, "dma-channel", &val))
1284                 gpmc_onenand_data->dma_channel = val;
1285
1286         gpmc_onenand_init(gpmc_onenand_data);
1287
1288         return 0;
1289 }
1290 #else
1291 static int gpmc_probe_onenand_child(struct platform_device *pdev,
1292                                     struct device_node *child)
1293 {
1294         return 0;
1295 }
1296 #endif
1297
1298 static int gpmc_probe_dt(struct platform_device *pdev)
1299 {
1300         int ret;
1301         struct device_node *child;
1302         const struct of_device_id *of_id =
1303                 of_match_device(gpmc_dt_ids, &pdev->dev);
1304
1305         if (!of_id)
1306                 return 0;
1307
1308         for_each_node_by_name(child, "nand") {
1309                 ret = gpmc_probe_nand_child(pdev, child);
1310                 if (ret < 0) {
1311                         of_node_put(child);
1312                         return ret;
1313                 }
1314         }
1315
1316         for_each_node_by_name(child, "onenand") {
1317                 ret = gpmc_probe_onenand_child(pdev, child);
1318                 if (ret < 0) {
1319                         of_node_put(child);
1320                         return ret;
1321                 }
1322         }
1323         return 0;
1324 }
1325 #else
1326 static int gpmc_probe_dt(struct platform_device *pdev)
1327 {
1328         return 0;
1329 }
1330 #endif
1331
1332 static int gpmc_probe(struct platform_device *pdev)
1333 {
1334         int rc;
1335         u32 l;
1336         struct resource *res;
1337
1338         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1339         if (res == NULL)
1340                 return -ENOENT;
1341
1342         phys_base = res->start;
1343         mem_size = resource_size(res);
1344
1345         gpmc_base = devm_ioremap_resource(&pdev->dev, res);
1346         if (IS_ERR(gpmc_base))
1347                 return PTR_ERR(gpmc_base);
1348
1349         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1350         if (res == NULL)
1351                 dev_warn(&pdev->dev, "Failed to get resource: irq\n");
1352         else
1353                 gpmc_irq = res->start;
1354
1355         gpmc_l3_clk = clk_get(&pdev->dev, "fck");
1356         if (IS_ERR(gpmc_l3_clk)) {
1357                 dev_err(&pdev->dev, "error: clk_get\n");
1358                 gpmc_irq = 0;
1359                 return PTR_ERR(gpmc_l3_clk);
1360         }
1361
1362         clk_prepare_enable(gpmc_l3_clk);
1363
1364         gpmc_dev = &pdev->dev;
1365
1366         l = gpmc_read_reg(GPMC_REVISION);
1367         if (GPMC_REVISION_MAJOR(l) > 0x4)
1368                 gpmc_capability = GPMC_HAS_WR_ACCESS | GPMC_HAS_WR_DATA_MUX_BUS;
1369         dev_info(gpmc_dev, "GPMC revision %d.%d\n", GPMC_REVISION_MAJOR(l),
1370                  GPMC_REVISION_MINOR(l));
1371
1372         rc = gpmc_mem_init();
1373         if (IS_ERR_VALUE(rc)) {
1374                 clk_disable_unprepare(gpmc_l3_clk);
1375                 clk_put(gpmc_l3_clk);
1376                 dev_err(gpmc_dev, "failed to reserve memory\n");
1377                 return rc;
1378         }
1379
1380         if (IS_ERR_VALUE(gpmc_setup_irq()))
1381                 dev_warn(gpmc_dev, "gpmc_setup_irq failed\n");
1382
1383         /* Now the GPMC is initialised, unreserve the chip-selects */
1384         gpmc_cs_map = 0;
1385
1386         rc = gpmc_probe_dt(pdev);
1387         if (rc < 0) {
1388                 clk_disable_unprepare(gpmc_l3_clk);
1389                 clk_put(gpmc_l3_clk);
1390                 dev_err(gpmc_dev, "failed to probe DT parameters\n");
1391                 return rc;
1392         }
1393
1394         return 0;
1395 }
1396
1397 static int gpmc_remove(struct platform_device *pdev)
1398 {
1399         gpmc_free_irq();
1400         gpmc_mem_exit();
1401         gpmc_dev = NULL;
1402         return 0;
1403 }
1404
1405 static struct platform_driver gpmc_driver = {
1406         .probe          = gpmc_probe,
1407         .remove         = gpmc_remove,
1408         .driver         = {
1409                 .name   = DEVICE_NAME,
1410                 .owner  = THIS_MODULE,
1411                 .of_match_table = of_match_ptr(gpmc_dt_ids),
1412         },
1413 };
1414
1415 static __init int gpmc_init(void)
1416 {
1417         return platform_driver_register(&gpmc_driver);
1418 }
1419
1420 static __exit void gpmc_exit(void)
1421 {
1422         platform_driver_unregister(&gpmc_driver);
1423
1424 }
1425
1426 omap_postcore_initcall(gpmc_init);
1427 module_exit(gpmc_exit);
1428
1429 static int __init omap_gpmc_init(void)
1430 {
1431         struct omap_hwmod *oh;
1432         struct platform_device *pdev;
1433         char *oh_name = "gpmc";
1434
1435         /*
1436          * if the board boots up with a populated DT, do not
1437          * manually add the device from this initcall
1438          */
1439         if (of_have_populated_dt())
1440                 return -ENODEV;
1441
1442         oh = omap_hwmod_lookup(oh_name);
1443         if (!oh) {
1444                 pr_err("Could not look up %s\n", oh_name);
1445                 return -ENODEV;
1446         }
1447
1448         pdev = omap_device_build(DEVICE_NAME, -1, oh, NULL, 0);
1449         WARN(IS_ERR(pdev), "could not build omap_device for %s\n", oh_name);
1450
1451         return IS_ERR(pdev) ? PTR_ERR(pdev) : 0;
1452 }
1453 omap_postcore_initcall(omap_gpmc_init);
1454
1455 static irqreturn_t gpmc_handle_irq(int irq, void *dev)
1456 {
1457         int i;
1458         u32 regval;
1459
1460         regval = gpmc_read_reg(GPMC_IRQSTATUS);
1461
1462         if (!regval)
1463                 return IRQ_NONE;
1464
1465         for (i = 0; i < GPMC_NR_IRQ; i++)
1466                 if (regval & gpmc_client_irq[i].bitmask)
1467                         generic_handle_irq(gpmc_client_irq[i].irq);
1468
1469         gpmc_write_reg(GPMC_IRQSTATUS, regval);
1470
1471         return IRQ_HANDLED;
1472 }
1473
1474 #ifdef CONFIG_ARCH_OMAP3
1475 static struct omap3_gpmc_regs gpmc_context;
1476
1477 void omap3_gpmc_save_context(void)
1478 {
1479         int i;
1480
1481         gpmc_context.sysconfig = gpmc_read_reg(GPMC_SYSCONFIG);
1482         gpmc_context.irqenable = gpmc_read_reg(GPMC_IRQENABLE);
1483         gpmc_context.timeout_ctrl = gpmc_read_reg(GPMC_TIMEOUT_CONTROL);
1484         gpmc_context.config = gpmc_read_reg(GPMC_CONFIG);
1485         gpmc_context.prefetch_config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1);
1486         gpmc_context.prefetch_config2 = gpmc_read_reg(GPMC_PREFETCH_CONFIG2);
1487         gpmc_context.prefetch_control = gpmc_read_reg(GPMC_PREFETCH_CONTROL);
1488         for (i = 0; i < GPMC_CS_NUM; i++) {
1489                 gpmc_context.cs_context[i].is_valid = gpmc_cs_mem_enabled(i);
1490                 if (gpmc_context.cs_context[i].is_valid) {
1491                         gpmc_context.cs_context[i].config1 =
1492                                 gpmc_cs_read_reg(i, GPMC_CS_CONFIG1);
1493                         gpmc_context.cs_context[i].config2 =
1494                                 gpmc_cs_read_reg(i, GPMC_CS_CONFIG2);
1495                         gpmc_context.cs_context[i].config3 =
1496                                 gpmc_cs_read_reg(i, GPMC_CS_CONFIG3);
1497                         gpmc_context.cs_context[i].config4 =
1498                                 gpmc_cs_read_reg(i, GPMC_CS_CONFIG4);
1499                         gpmc_context.cs_context[i].config5 =
1500                                 gpmc_cs_read_reg(i, GPMC_CS_CONFIG5);
1501                         gpmc_context.cs_context[i].config6 =
1502                                 gpmc_cs_read_reg(i, GPMC_CS_CONFIG6);
1503                         gpmc_context.cs_context[i].config7 =
1504                                 gpmc_cs_read_reg(i, GPMC_CS_CONFIG7);
1505                 }
1506         }
1507 }
1508
1509 void omap3_gpmc_restore_context(void)
1510 {
1511         int i;
1512
1513         gpmc_write_reg(GPMC_SYSCONFIG, gpmc_context.sysconfig);
1514         gpmc_write_reg(GPMC_IRQENABLE, gpmc_context.irqenable);
1515         gpmc_write_reg(GPMC_TIMEOUT_CONTROL, gpmc_context.timeout_ctrl);
1516         gpmc_write_reg(GPMC_CONFIG, gpmc_context.config);
1517         gpmc_write_reg(GPMC_PREFETCH_CONFIG1, gpmc_context.prefetch_config1);
1518         gpmc_write_reg(GPMC_PREFETCH_CONFIG2, gpmc_context.prefetch_config2);
1519         gpmc_write_reg(GPMC_PREFETCH_CONTROL, gpmc_context.prefetch_control);
1520         for (i = 0; i < GPMC_CS_NUM; i++) {
1521                 if (gpmc_context.cs_context[i].is_valid) {
1522                         gpmc_cs_write_reg(i, GPMC_CS_CONFIG1,
1523                                 gpmc_context.cs_context[i].config1);
1524                         gpmc_cs_write_reg(i, GPMC_CS_CONFIG2,
1525                                 gpmc_context.cs_context[i].config2);
1526                         gpmc_cs_write_reg(i, GPMC_CS_CONFIG3,
1527                                 gpmc_context.cs_context[i].config3);
1528                         gpmc_cs_write_reg(i, GPMC_CS_CONFIG4,
1529                                 gpmc_context.cs_context[i].config4);
1530                         gpmc_cs_write_reg(i, GPMC_CS_CONFIG5,
1531                                 gpmc_context.cs_context[i].config5);
1532                         gpmc_cs_write_reg(i, GPMC_CS_CONFIG6,
1533                                 gpmc_context.cs_context[i].config6);
1534                         gpmc_cs_write_reg(i, GPMC_CS_CONFIG7,
1535                                 gpmc_context.cs_context[i].config7);
1536                 }
1537         }
1538 }
1539 #endif /* CONFIG_ARCH_OMAP3 */