target/linux/mpc83xx/patches-2.6.36/013-drivers_ata_pata_rbppc_cf.patch

   1 --- /dev/null
   2 +++ b/drivers/ata/pata_rbppc_cf.c
   3 @@ -0,0 +1,701 @@
   4 +/*
   5 + * Copyright (C) 2008-2009 Noah Fontes <nfontes@transtruct.org>
   6 + * Copyright (C) Mikrotik 2007
   7 + *
   8 + * This program is free software; you can redistribute it and/or modify it
   9 + * under the terms of the GNU General Public License as published by the
  10 + * Free Software Foundation; either version 2 of the License, or (at your
  11 + * option) any later version.
  12 + */
  13 +
  14 +#include <linux/kernel.h>
  15 +#include <linux/module.h>
  16 +#include <linux/init.h>
  17 +#include <scsi/scsi_host.h>
  18 +#include <linux/libata.h>
  19 +#include <linux/of_platform.h>
  20 +#include <linux/ata_platform.h>
  21 +
  22 +#define DEBUG_UPM      0
  23 +
  24 +#define DRV_NAME       "pata_rbppc_cf"
  25 +#define DRV_VERSION    "0.0.2"
  26 +
  27 +#define DEV2SEL_OFFSET 0x00100000
  28 +
  29 +#define IMMR_LBCFG_OFFSET      0x00005000
  30 +#define IMMR_LBCFG_SIZE                0x00001000
  31 +
  32 +#define LOCAL_BUS_MCMR         0x00000078
  33 +#define   MxMR_OP_MASK                 0x30000000
  34 +#define   MxMR_OP_NORMAL               0x00000000
  35 +#define   MxMR_OP_WRITE                        0x10000000
  36 +#define   MxMR_OP_READ                 0x20000000
  37 +#define   MxMR_OP_RUN                  0x30000000
  38 +#define   MxMR_LUPWAIT_LOW             0x08000000
  39 +#define   MxMR_LUPWAIT_HIGH            0x00000000
  40 +#define   MxMR_LUPWAIT_ENABLE          0x00040000
  41 +#define   MxMR_RLF_MASK                        0x0003c000
  42 +#define   MxMR_RLF_SHIFT                       14
  43 +#define   MxMR_WLF_MASK                        0x00003c00
  44 +#define   MxMR_WLF_SHIFT                       10
  45 +#define   MxMR_MAD_MASK                        0x0000003f
  46 +#define LOCAL_BUS_MDR          0x00000088
  47 +#define LOCAL_BUS_LCRR         0x000000D4
  48 +#define   LCRR_CLKDIV_MASK             0x0000000f
  49 +
  50 +#define LOOP_SIZE      4
  51 +
  52 +#define UPM_READ_SINGLE_OFFSET 0x00
  53 +#define UPM_WRITE_SINGLE_OFFSET        0x18
  54 +#define UPM_DATA_SIZE  0x40
  55 +
  56 +#define LBT_CPUIN_MIN          0
  57 +#define LBT_CPUOUT_MIN         1
  58 +#define LBT_CPUOUT_MAX         2
  59 +#define LBT_EXTDEL_MIN         3
  60 +#define LBT_EXTDEL_MAX         4
  61 +#define LBT_SIZE               5
  62 +
  63 +/* UPM machine configuration bits */
  64 +#define N_BASE 0x00f00000
  65 +#define N_CS   0xf0000000
  66 +#define N_CS_H1        0xc0000000
  67 +#define N_CS_H2        0x30000000
  68 +#define N_WE   0x0f000000
  69 +#define N_WE_H1        0x0c000000
  70 +#define N_WE_H2        0x03000000
  71 +#define N_OE   0x00030000
  72 +#define N_OE_H1        0x00020000
  73 +#define N_OE_H2        0x00010000
  74 +#define WAEN   0x00001000
  75 +#define REDO_2 0x00000100
  76 +#define REDO_3 0x00000200
  77 +#define REDO_4 0x00000300
  78 +#define LOOP   0x00000080
  79 +#define NA     0x00000008
  80 +#define UTA    0x00000004
  81 +#define LAST   0x00000001
  82 +
  83 +#define REDO_VAL(mult) (REDO_2 * ((mult) - 1))
  84 +#define REDO_MAX_MULT  4
  85 +
  86 +#define READ_BASE      (N_BASE | N_WE)
  87 +#define WRITE_BASE     (N_BASE | N_OE)
  88 +#define EMPTY          (N_BASE | N_CS | N_OE | N_WE | LAST)
  89 +
  90 +#define EOF_UPM_SETTINGS       0
  91 +#define ANOTHER_TIMING         1
  92 +
  93 +#define OA_CPUIN_MIN           0x01
  94 +#define OA_CPUOUT_MAX          0x02
  95 +#define OD_CPUOUT_MIN          0x04
  96 +#define OA_CPUOUT_DELTA                0x06
  97 +#define OA_EXTDEL_MAX          0x08
  98 +#define OD_EXTDEL_MIN          0x10
  99 +#define OA_EXTDEL_DELTA                0x18
 100 +#define O_MIN_CYCLE_TIME       0x20
 101 +#define O_MINUS_PREV           0x40
 102 +#define O_HALF_CYCLE           0x80
 103 +
 104 +extern void __iomem *localbus_map(unsigned long addr, unsigned int len);
 105 +extern void localbus_unmap(void __iomem *addr);
 106 +
 107 +struct rbppc_cf_info {
 108 +       unsigned lbcfg_addr;
 109 +       unsigned clk_time_ps;
 110 +       int cur_mode;
 111 +       u32 lb_timings[LBT_SIZE];
 112 +};
 113 +static struct rbppc_cf_info *rbinfo = NULL;
 114 +
 115 +struct upm_setting {
 116 +       unsigned value;
 117 +       unsigned ns[7];
 118 +       unsigned clk_minus;
 119 +       unsigned group_size;
 120 +       unsigned options;
 121 +};
 122 +
 123 +static const struct upm_setting cfUpmReadSingle[] = {
 124 +       { READ_BASE | N_OE,
 125 +         /* t1 - ADDR setup time */
 126 +               {  70,  50,  30,  30,  25,  15,  10 }, 0, 0, (OA_CPUOUT_DELTA |
 127 +                                                             OA_EXTDEL_MAX) },
 128 +       { READ_BASE | N_OE_H1,
 129 +               {   0,   0,   0,   0,   0,   0,   0 }, 0, 0, O_HALF_CYCLE },
 130 +       { READ_BASE,
 131 +         /* t2 - OE0 time */
 132 +               { 290, 290, 290,  80,  70,  65,  55 }, 0, 2, (OA_CPUOUT_MAX |
 133 +                                                             OA_CPUIN_MIN) },
 134 +       { READ_BASE | WAEN,
 135 +               {   1,   1,   1,   1,   1,   0,   0 }, 0, 0, 0 },
 136 +       { READ_BASE | UTA,
 137 +               {   1,   1,   1,   1,   1,   1,   1 }, 0, 0, 0 },
 138 +       { READ_BASE | N_OE,
 139 +         /* t9 - ADDR hold time */
 140 +               {  20,  15,  10,  10,  10,  10,  10 }, 0, 0, (OA_CPUOUT_DELTA |
 141 +                                                             OD_EXTDEL_MIN) },
 142 +       { READ_BASE | N_OE | N_CS_H2,
 143 +               {   0,   0,   0,   0,   0,   0,   0 }, 0, 0, O_HALF_CYCLE },
 144 +       { READ_BASE | N_OE | N_CS,
 145 +         /* t6Z -IORD data tristate */
 146 +               {  30,  30,  30,  30,  30,  20,  20 }, 1, 1, O_MINUS_PREV },
 147 +       { ANOTHER_TIMING,
 148 +         /* t2i -IORD recovery time */
 149 +               {   0,   0,   0,  70,  25,  25,  20 }, 2, 0, 0 },
 150 +       { ANOTHER_TIMING,
 151 +         /* CS 0 -> 1 MAX */
 152 +               {   0,   0,   0,   0,   0,   0,   0 }, 1, 0, (OA_CPUOUT_DELTA |
 153 +                                                             OA_EXTDEL_MAX) },
 154 +       { READ_BASE | N_OE | N_CS | LAST,
 155 +               {   1,   1,   1,   1,   1,   1,   1 }, 0, 0, 0 },
 156 +       { EOF_UPM_SETTINGS,
 157 +         /* min total cycle time - includes turnaround and ALE cycle */
 158 +               { 600, 383, 240, 180, 120, 100,  80 }, 2, 0, O_MIN_CYCLE_TIME },
 159 +};
 160 +
 161 +static const struct upm_setting cfUpmWriteSingle[] = {
 162 +       { WRITE_BASE | N_WE,
 163 +         /* t1 - ADDR setup time */
 164 +               {  70,  50,  30,  30,  25,  15,  10 }, 0, 0, (OA_CPUOUT_DELTA |
 165 +                                                             OA_EXTDEL_MAX) },
 166 +       { WRITE_BASE | N_WE_H1,
 167 +               {   0,   0,   0,   0,   0,   0,   0 }, 0, 0, O_HALF_CYCLE },
 168 +       { WRITE_BASE,
 169 +         /* t2 - WE0 time */
 170 +               { 290, 290, 290,  80,  70,  65,  55 }, 0, 1, OA_CPUOUT_DELTA },
 171 +       { WRITE_BASE | WAEN,
 172 +               {   1,   1,   1,   1,   1,   0,   0 }, 0, 0, 0 },
 173 +       { WRITE_BASE | N_WE,
 174 +         /* t9 - ADDR hold time */
 175 +               {  20,  15,  10,  10,  10,  10,  10 }, 0, 0, (OA_CPUOUT_DELTA |
 176 +                                                             OD_EXTDEL_MIN) },
 177 +       { WRITE_BASE | N_WE | N_CS_H2,
 178 +               {   0,   0,   0,   0,   0,   0,   0 }, 0, 0, O_HALF_CYCLE },
 179 +       { WRITE_BASE | N_WE | N_CS,
 180 +         /* t4 - DATA hold time */
 181 +               {  30,  20,  15,  10,  10,  10,  10 }, 0, 1, O_MINUS_PREV },
 182 +       { ANOTHER_TIMING,
 183 +         /* t2i -IOWR recovery time */
 184 +               {   0,   0,   0,  70,  25,  25,  20 }, 1, 0, 0 },
 185 +       { ANOTHER_TIMING,
 186 +         /* CS 0 -> 1 MAX */
 187 +               {   0,   0,   0,   0,   0,   0,   0 }, 0, 0, (OA_CPUOUT_DELTA |
 188 +                                                             OA_EXTDEL_MAX) },
 189 +       { WRITE_BASE | N_WE | N_CS | UTA | LAST,
 190 +               {   1,   1,   1,   1,   1,   1,   1 }, 0, 0, 0 },
 191 +       /* min total cycle time - includes ALE cycle */
 192 +       { EOF_UPM_SETTINGS,
 193 +               { 600, 383, 240, 180, 120, 100,  80 }, 1, 0, O_MIN_CYCLE_TIME },
 194 +};
 195 +
 196 +static u8 rbppc_cf_check_status(struct ata_port *ap) {
 197 +       u8 val = ioread8(ap->ioaddr.status_addr);
 198 +       if (val == 0xF9)
 199 +               val = 0x7F;
 200 +       return val;
 201 +}
 202 +
 203 +static u8 rbppc_cf_check_altstatus(struct ata_port *ap) {
 204 +       u8 val = ioread8(ap->ioaddr.altstatus_addr);
 205 +       if (val == 0xF9)
 206 +               val = 0x7F;
 207 +       return val;
 208 +}
 209 +
 210 +static void rbppc_cf_dummy_noret(struct ata_port *ap) { }
 211 +static int rbppc_cf_dummy_ret0(struct ata_port *ap) { return 0; }
 212 +
 213 +static int ps2clk(int ps, unsigned clk_time_ps) {
 214 +       int psMaxOver;
 215 +       if (ps <= 0) return 0;
 216 +
 217 +       /* round down if <= 2% over clk border, but no more than 1/4 clk cycle */
 218 +       psMaxOver = ps * 2 / 100;
 219 +       if (4 * psMaxOver > clk_time_ps) {
 220 +               psMaxOver = clk_time_ps / 4;
 221 +       }
 222 +       return (ps + clk_time_ps - 1 - psMaxOver) / clk_time_ps;
 223 +}
 224 +
 225 +static int upm_gen_ps_table(const struct upm_setting *upm,
 226 +                           int mode, struct rbppc_cf_info *info,
 227 +                           int *psFinal) {
 228 +       int uidx;
 229 +       int lastUpmValIdx = 0;
 230 +       int group_start_idx = -1;
 231 +       int group_left_num = -1;
 232 +       int clk_time_ps = info->clk_time_ps;
 233 +
 234 +       for (uidx = 0; upm[uidx].value != EOF_UPM_SETTINGS; ++uidx) {
 235 +               const struct upm_setting *us = upm + uidx;
 236 +               unsigned opt = us->options;
 237 +               int ps = us->ns[mode] * 1000 - us->clk_minus * clk_time_ps;
 238 +
 239 +               if (opt & OA_CPUIN_MIN) ps += info->lb_timings[LBT_CPUIN_MIN];
 240 +               if (opt & OD_CPUOUT_MIN) ps -= info->lb_timings[LBT_CPUOUT_MIN];
 241 +               if (opt & OA_CPUOUT_MAX) ps += info->lb_timings[LBT_CPUOUT_MAX];
 242 +               if (opt & OD_EXTDEL_MIN) ps -= info->lb_timings[LBT_EXTDEL_MIN];
 243 +               if (opt & OA_EXTDEL_MAX) ps += info->lb_timings[LBT_EXTDEL_MAX];
 244 +
 245 +               if (us->value == ANOTHER_TIMING) {
 246 +                       /* use longest timing from alternatives */
 247 +                       if (psFinal[lastUpmValIdx] < ps) {
 248 +                               psFinal[lastUpmValIdx] = ps;
 249 +                       }
 250 +                       ps = 0;
 251 +               }
 252 +               else {
 253 +                       if (us->group_size) {
 254 +                               group_start_idx = uidx;
 255 +                               group_left_num = us->group_size;
 256 +                       }
 257 +                       else if (group_left_num > 0) {
 258 +                               /* group time is divided on all group members */
 259 +                               int clk = ps2clk(ps, clk_time_ps);
 260 +                               psFinal[group_start_idx] -= clk * clk_time_ps;
 261 +                               --group_left_num;
 262 +                       }
 263 +                       if ((opt & O_MINUS_PREV) && lastUpmValIdx > 0) {
 264 +                               int clk = ps2clk(psFinal[lastUpmValIdx],
 265 +                                                clk_time_ps);
 266 +                               ps -= clk * clk_time_ps;
 267 +                       }
 268 +                       lastUpmValIdx = uidx;
 269 +               }
 270 +               psFinal[uidx] = ps;
 271 +       }
 272 +       return uidx;
 273 +}
 274 +
 275 +static int free_half(int ps, int clk, int clk_time_ps) {
 276 +    if (clk < 2) return 0;
 277 +    return (clk * clk_time_ps - ps) * 2 >= clk_time_ps;
 278 +}
 279 +
 280 +static void upm_gen_clk_table(const struct upm_setting *upm,
 281 +                             int mode, int clk_time_ps,
 282 +                             int max_uidx, const int *psFinal, int *clkFinal) {
 283 +       int clk_cycle_time;
 284 +       int clk_total;
 285 +       int uidx;
 286 +
 287 +       /* convert picoseconds to clocks */
 288 +       clk_total = 0;
 289 +       for (uidx = 0; uidx < max_uidx; ++uidx) {
 290 +               int clk = ps2clk(psFinal[uidx], clk_time_ps);
 291 +               clkFinal[uidx] = clk;
 292 +               clk_total += clk;
 293 +       }
 294 +
 295 +       /* check possibility of half cycle usage */
 296 +       for (uidx = 1; uidx < max_uidx - 1; ++uidx) {
 297 +               if ((upm[uidx].options & O_HALF_CYCLE) &&
 298 +                   free_half(psFinal[uidx - 1], clkFinal[uidx - 1],
 299 +                             clk_time_ps) &&
 300 +                   free_half(psFinal[uidx + 1], clkFinal[uidx + 1],
 301 +                             clk_time_ps)) {
 302 +                       ++clkFinal[uidx];
 303 +                       --clkFinal[uidx - 1];
 304 +                       --clkFinal[uidx + 1];
 305 +               }
 306 +       }
 307 +
 308 +       if ((upm[max_uidx].options & O_MIN_CYCLE_TIME) == 0) return;
 309 +
 310 +       /* check cycle time, adjust timings if needed */
 311 +       clk_cycle_time = (ps2clk(upm[max_uidx].ns[mode] * 1000, clk_time_ps) -
 312 +                         upm[max_uidx].clk_minus);
 313 +       uidx = 0;
 314 +       while (clk_total < clk_cycle_time) {
 315 +               /* extend all timings in round-robin to match cycle time */
 316 +               if (clkFinal[uidx]) {
 317 +#if DEBUG_UPM
 318 +                       printk(KERN_INFO "extending %u by 1 clk\n", uidx);
 319 +#endif
 320 +                       ++clkFinal[uidx];
 321 +                       ++clk_total;
 322 +               }
 323 +               ++uidx;
 324 +               if (uidx == max_uidx) uidx = 0;
 325 +       }
 326 +}
 327 +
 328 +static void add_data_val(unsigned val, int *clkLeft, int maxClk,
 329 +                       unsigned *data, int *dataIdx) {
 330 +       if (*clkLeft == 0) return;
 331 +
 332 +       if (maxClk == 0 && *clkLeft >= LOOP_SIZE * 2) {
 333 +               int times;
 334 +               int times1;
 335 +               int times2;
 336 +
 337 +               times = *clkLeft / LOOP_SIZE;
 338 +               if (times > REDO_MAX_MULT * 2) times = REDO_MAX_MULT * 2;
 339 +               times1 = times / 2;
 340 +               times2 = times - times1;
 341 +
 342 +               val |= LOOP;
 343 +               data[*dataIdx] = val | REDO_VAL(times1);
 344 +               ++(*dataIdx);
 345 +               data[*dataIdx] = val | REDO_VAL(times2);
 346 +               ++(*dataIdx);
 347 +
 348 +               *clkLeft -= times * LOOP_SIZE;
 349 +               return;
 350 +       }
 351 +
 352 +       if (maxClk < 1 || maxClk > REDO_MAX_MULT) maxClk = REDO_MAX_MULT;
 353 +       if (*clkLeft < maxClk) maxClk = *clkLeft;
 354 +
 355 +       *clkLeft -= maxClk;
 356 +       val |= REDO_VAL(maxClk);
 357 +
 358 +       data[*dataIdx] = val;
 359 +       ++(*dataIdx);
 360 +}
 361 +
 362 +static int upm_gen_final_data(const struct upm_setting *upm,
 363 +                              int max_uidx, int *clkFinal, unsigned *data) {
 364 +       int dataIdx;
 365 +       int uidx;
 366 +
 367 +       dataIdx = 0;
 368 +       for (uidx = 0; uidx < max_uidx; ++uidx) {
 369 +               int clk = clkFinal[uidx];
 370 +               while (clk > 0) {
 371 +                       add_data_val(upm[uidx].value, &clk, 0,
 372 +                                    data, &dataIdx);
 373 +               }
 374 +       }
 375 +       return dataIdx;
 376 +}
 377 +
 378 +static int conv_upm_table(const struct upm_setting *upm,
 379 +                         int mode, struct rbppc_cf_info *info,
 380 +                         unsigned *data) {
 381 +#if DEBUG_UPM
 382 +       int uidx;
 383 +#endif
 384 +       int psFinal[32];
 385 +       int clkFinal[32];
 386 +       int max_uidx;
 387 +       int data_len;
 388 +
 389 +       max_uidx = upm_gen_ps_table(upm, mode, info, psFinal);
 390 +
 391 +       upm_gen_clk_table(upm, mode, info->clk_time_ps, max_uidx,
 392 +                         psFinal, clkFinal);
 393 +
 394 +#if DEBUG_UPM
 395 +       /* dump out debug info */
 396 +       for (uidx = 0; uidx < max_uidx; ++uidx) {
 397 +               if (clkFinal[uidx]) {
 398 +                       printk(KERN_INFO "idx %d val %08x clk %d ps %d\n",
 399 +                               uidx, upm[uidx].value,
 400 +                               clkFinal[uidx], psFinal[uidx]);
 401 +               }
 402 +       }
 403 +#endif
 404 +
 405 +       data_len = upm_gen_final_data(upm, max_uidx, clkFinal, data);
 406 +
 407 +#if DEBUG_UPM
 408 +       for (uidx = 0; uidx < data_len; ++uidx) {
 409 +               printk(KERN_INFO "cf UPM x result: idx %d val %08x\n",
 410 +                      uidx, data[uidx]);
 411 +       }
 412 +#endif
 413 +       return 0;
 414 +}
 415 +
 416 +static int gen_upm_data(int mode, struct rbppc_cf_info *info, unsigned *data) {
 417 +       int i;
 418 +
 419 +       for (i = 0; i < UPM_DATA_SIZE; ++i) {
 420 +               data[i] = EMPTY;
 421 +       }
 422 +
 423 +       if (conv_upm_table(cfUpmReadSingle, mode, info, data + UPM_READ_SINGLE_OFFSET)) {
 424 +               return -1;
 425 +       }
 426 +       if (conv_upm_table(cfUpmWriteSingle, mode, info, data + UPM_WRITE_SINGLE_OFFSET)) {
 427 +               return -1;
 428 +       }
 429 +       return 0;
 430 +}
 431 +
 432 +static void rbppc_cf_program_upm(void *upmMemAddr, volatile void *lbcfg_mxmr, volatile void *lbcfg_mdr, const unsigned *upmData, unsigned offset, unsigned len) {
 433 +       unsigned i;
 434 +       unsigned mxmr;
 435 +
 436 +       mxmr = in_be32(lbcfg_mxmr);
 437 +       mxmr &= ~(MxMR_OP_MASK | MxMR_MAD_MASK);
 438 +       mxmr |= (MxMR_OP_WRITE | offset);
 439 +       out_be32(lbcfg_mxmr, mxmr);
 440 +       in_be32(lbcfg_mxmr); /* flush MxMR write */
 441 +
 442 +       for (i = 0; i < len; ++i) {
 443 +               int to;
 444 +               unsigned data = upmData[i + offset];
 445 +               out_be32(lbcfg_mdr, data);
 446 +               in_be32(lbcfg_mdr); /* flush MDR write */
 447 +
 448 +               iowrite8(1, upmMemAddr); /* dummy write to any CF addr */
 449 +
 450 +               /* wait for dummy write to complete */
 451 +               for (to = 10000; to >= 0; --to) {
 452 +                       mxmr = in_be32(lbcfg_mxmr);
 453 +                       if (((mxmr ^ (i + 1)) & MxMR_MAD_MASK) == 0) {
 454 +                               break;
 455 +                       }
 456 +                       if (to == 0) {
 457 +                               printk(KERN_ERR "rbppc_cf_program_upm: UPMx program error at 0x%x: Timeout\n", i);
 458 +                       }
 459 +               }
 460 +       }
 461 +       mxmr &= ~(MxMR_OP_MASK | MxMR_RLF_MASK | MxMR_WLF_MASK);
 462 +       mxmr |= (MxMR_OP_NORMAL | (LOOP_SIZE << MxMR_RLF_SHIFT) | (LOOP_SIZE << MxMR_WLF_SHIFT));
 463 +       out_be32(lbcfg_mxmr, mxmr);
 464 +}
 465 +
 466 +static int rbppc_cf_update_piomode(struct ata_port *ap, int mode) {
 467 +       struct rbppc_cf_info *info = (struct rbppc_cf_info *)ap->host->private_data;
 468 +       void *lbcfgBase;
 469 +       unsigned upmData[UPM_DATA_SIZE];
 470 +
 471 +       if (gen_upm_data(mode, info, upmData)) {
 472 +               return -1;
 473 +       }
 474 +
 475 +       lbcfgBase = ioremap_nocache(info->lbcfg_addr, IMMR_LBCFG_SIZE);
 476 +
 477 +       rbppc_cf_program_upm(ap->ioaddr.cmd_addr, ((char *)lbcfgBase) + LOCAL_BUS_MCMR, ((char *)lbcfgBase) + LOCAL_BUS_MDR, upmData, 0, UPM_DATA_SIZE);
 478 +       iounmap(lbcfgBase);
 479 +       return 0;
 480 +}
 481 +
 482 +static void rbppc_cf_set_piomode(struct ata_port *ap, struct ata_device *adev)
 483 +{
 484 +       struct rbppc_cf_info *info = (struct rbppc_cf_info *)ap->host->private_data;
 485 +       int mode = adev->pio_mode - XFER_PIO_0;
 486 +
 487 +       DPRINTK("rbppc_cf_set_piomode: PIO %d\n", mode);
 488 +       if (mode < 0) mode = 0;
 489 +       if (mode > 6) mode = 6;
 490 +
 491 +       if (info->cur_mode < 0 || info->cur_mode > mode) {
 492 +               if (rbppc_cf_update_piomode(ap, mode) == 0) {
 493 +                       printk(KERN_INFO "rbppc_cf_set_piomode: PIO mode changed to %d\n", mode);
 494 +                       info->cur_mode = mode;
 495 +               }
 496 +       }
 497 +}
 498 +
 499 +static struct scsi_host_template rbppc_cf_sht = {
 500 +       ATA_BASE_SHT(DRV_NAME),
 501 +};
 502 +
 503 +static struct ata_port_operations rbppc_cf_port_ops = {
 504 +       .inherits               = &ata_bmdma_port_ops,
 505 +
 506 +       .sff_check_status       = rbppc_cf_check_status,
 507 +       .sff_check_altstatus    = rbppc_cf_check_altstatus,
 508 +
 509 +       .set_piomode            = rbppc_cf_set_piomode,
 510 +
 511 +       .port_start             = rbppc_cf_dummy_ret0,
 512 +
 513 +       .sff_irq_clear          = rbppc_cf_dummy_noret,
 514 +};
 515 +
 516 +static int rbppc_cf_init_info(struct of_device *pdev, struct rbppc_cf_info *info) {
 517 +       struct device_node *np;
 518 +       struct resource res;
 519 +       const u32 *u32ptr;
 520 +       void *lbcfgBase;
 521 +       void *lbcfg_lcrr;
 522 +       unsigned lbc_clk_khz;
 523 +       unsigned lbc_extra_divider = 1;
 524 +       unsigned ccb_freq_hz;
 525 +       unsigned lb_div;
 526 +
 527 +       u32ptr = of_get_property(pdev->node, "lbc_extra_divider", NULL);
 528 +       if (u32ptr && *u32ptr) {
 529 +               lbc_extra_divider = *u32ptr;
 530 +#if DEBUG_UPM
 531 +               printk(KERN_INFO "rbppc_cf_init_info: LBC extra divider %u\n",
 532 +                      lbc_extra_divider);
 533 +#endif
 534 +       }
 535 +
 536 +       np = of_find_node_by_type(NULL, "serial");
 537 +       if (!np) {
 538 +               printk(KERN_ERR "rbppc_cf_init_info: No serial node found\n");
 539 +               return -1;
 540 +       }
 541 +       u32ptr = of_get_property(np, "clock-frequency", NULL);
 542 +       if (u32ptr == 0 || *u32ptr == 0) {
 543 +               printk(KERN_ERR "rbppc_cf_init_info: Serial does not have clock-frequency\n");
 544 +               of_node_put(np);
 545 +               return -1;
 546 +       }
 547 +       ccb_freq_hz = *u32ptr;
 548 +       of_node_put(np);
 549 +
 550 +       np = of_find_node_by_type(NULL, "soc");
 551 +       if (!np) {
 552 +               printk(KERN_ERR "rbppc_cf_init_info: No soc node found\n");
 553 +               return -1;
 554 +       }
 555 +       if (of_address_to_resource(np, 0, &res)) {
 556 +               printk(KERN_ERR "rbppc_cf_init_info: soc does not have resource\n");
 557 +               of_node_put(np);
 558 +               return -1;
 559 +       }
 560 +       info->lbcfg_addr = res.start + IMMR_LBCFG_OFFSET;
 561 +       of_node_put(np);
 562 +
 563 +       lbcfgBase = ioremap_nocache(info->lbcfg_addr, IMMR_LBCFG_SIZE);
 564 +       lbcfg_lcrr = ((char*)lbcfgBase) + LOCAL_BUS_LCRR;
 565 +       lb_div = (in_be32(lbcfg_lcrr) & LCRR_CLKDIV_MASK) * lbc_extra_divider;
 566 +       iounmap(lbcfgBase);
 567 +
 568 +       lbc_clk_khz = ccb_freq_hz / (1000 * lb_div);
 569 +       info->clk_time_ps = 1000000000 / lbc_clk_khz;
 570 +       printk(KERN_INFO "rbppc_cf_init_info: Using Local-Bus clock %u kHz %u ps\n",
 571 +              lbc_clk_khz, info->clk_time_ps);
 572 +
 573 +       u32ptr = of_get_property(pdev->node, "lb-timings", NULL);
 574 +       if (u32ptr) {
 575 +               memcpy(info->lb_timings, u32ptr, LBT_SIZE * sizeof(*u32ptr));
 576 +#if DEBUG_UPM
 577 +               printk(KERN_INFO "rbppc_cf_init_info: Got LB timings <%u %u %u %u %u>\n",
 578 +                      u32ptr[0], u32ptr[1], u32ptr[2], u32ptr[3], u32ptr[4]);
 579 +#endif
 580 +       }
 581 +       info->cur_mode = -1;
 582 +       return 0;
 583 +}
 584 +
 585 +static int rbppc_cf_probe(struct of_device *pdev,
 586 +                         const struct of_device_id *match)
 587 +{
 588 +       struct ata_host *host;
 589 +       struct ata_port *ap;
 590 +       struct rbppc_cf_info *info = NULL;
 591 +       struct resource res;
 592 +       void *baddr;
 593 +       const u32 *u32ptr;
 594 +       int irq_level = 0;
 595 +       int err = -ENOMEM;
 596 +
 597 +       printk(KERN_INFO "rbppc_cf_probe: MikroTik RouterBOARD 600 series Compact Flash PATA driver, version " DRV_VERSION "\n");
 598 +
 599 +       if (rbinfo == NULL) {
 600 +               info = kmalloc(sizeof(*info), GFP_KERNEL);
 601 +               if (info == NULL) {
 602 +                       printk(KERN_ERR "rbppc_cf_probe: Out of memory\n");
 603 +                       goto err_info;
 604 +               }
 605 +               memset(info, 0, sizeof(*info));
 606 +
 607 +               if (rbppc_cf_init_info(pdev, info)) {
 608 +                       goto err_info;
 609 +               }
 610 +               rbinfo = info;
 611 +       }
 612 +
 613 +       u32ptr = of_get_property(pdev->node, "interrupt-at-level", NULL);
 614 +       if (u32ptr) {
 615 +               irq_level = *u32ptr;
 616 +               printk(KERN_INFO "rbppc_cf_probe: IRQ level %u\n", irq_level);
 617 +       }
 618 +
 619 +       if (of_address_to_resource(pdev->node, 0, &res)) {
 620 +           printk(KERN_ERR "rbppc_cf_probe: No reg property found\n");
 621 +           goto err_info;
 622 +       }
 623 +
 624 +       host = ata_host_alloc(&pdev->dev, 1);
 625 +       if (!host)
 626 +           goto err_info;
 627 +
 628 +       baddr = localbus_map(res.start, res.end - res.start + 1);
 629 +       host->iomap = baddr;
 630 +       host->private_data = rbinfo;
 631 +
 632 +       ap = host->ports[0];
 633 +       ap->ops = &rbppc_cf_port_ops;
 634 +       ap->pio_mask = 0x7F;    /* PIO modes 0-6 */
 635 +       ap->flags = ATA_FLAG_NO_LEGACY;
 636 +       ap->mwdma_mask = 0;
 637 +
 638 +       ap->ioaddr.cmd_addr = baddr;
 639 +       ata_sff_std_ports(&ap->ioaddr);
 640 +       ap->ioaddr.ctl_addr = ap->ioaddr.cmd_addr + 14;
 641 +       ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
 642 +       ap->ioaddr.bmdma_addr = 0;
 643 +
 644 +       err = ata_host_activate(
 645 +               host,
 646 +               irq_of_parse_and_map(pdev->node, 0), ata_sff_interrupt,
 647 +               irq_level ? IRQF_TRIGGER_HIGH : IRQF_TRIGGER_LOW,
 648 +               &rbppc_cf_sht);
 649 +       if (!err) return 0;
 650 +
 651 +       localbus_unmap(baddr);
 652 +err_info:
 653 +       if (info) {
 654 +               kfree(info);
 655 +               rbinfo = NULL;
 656 +       }
 657 +       return err;
 658 +}
 659 +
 660 +static int rbppc_cf_remove(struct of_device *pdev)
 661 +{
 662 +       struct device *dev = &pdev->dev;
 663 +       struct ata_host *host = dev_get_drvdata(dev);
 664 +
 665 +       if (host == NULL) return -1;
 666 +
 667 +       ata_host_detach(host);
 668 +       return 0;
 669 +}
 670 +
 671 +static struct of_device_id rbppc_cf_ids[] = {
 672 +       { .name = "cf", },
 673 +       { },
 674 +};
 675 +
 676 +static struct of_platform_driver rbppc_cf_driver = {
 677 +       .name = "cf",
 678 +       .probe = rbppc_cf_probe,
 679 +       .remove = rbppc_cf_remove,
 680 +       .match_table = rbppc_cf_ids,
 681 +       .driver = {
 682 +               .name = "rbppc-cf",
 683 +               .owner = THIS_MODULE,
 684 +       },
 685 +};
 686 +
 687 +static int __init rbppc_init(void)
 688 +{
 689 +       return of_register_platform_driver(&rbppc_cf_driver);
 690 +}
 691 +
 692 +static void __exit rbppc_exit(void)
 693 +{
 694 +       of_unregister_platform_driver(&rbppc_cf_driver);
 695 +}
 696 +
 697 +MODULE_AUTHOR("Mikrotikls SIA");
 698 +MODULE_AUTHOR("Noah Fontes");
 699 +MODULE_DESCRIPTION("MikroTik RouterBOARD 600 series Compact Flash PATA driver");
 700 +MODULE_LICENSE("GPL");
 701 +MODULE_VERSION(DRV_VERSION);
 702 +
 703 +module_init(rbppc_init);
 704 +module_exit(rbppc_exit);