kernel/drivers/clk/st/clkgen-mux.c

   1 /*
   2  * clkgen-mux.c: ST GEN-MUX Clock driver
   3  *
   4  * Copyright (C) 2014 STMicroelectronics (R&D) Limited
   5  *
   6  * Authors: Stephen Gallimore <stephen.gallimore@st.com>
   7  *          Pankaj Dev <pankaj.dev@st.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  */
  15
  16 #include <linux/slab.h>
  17 #include <linux/of_address.h>
  18 #include <linux/clk.h>
  19 #include <linux/clk-provider.h>
  20 #include "clkgen.h"
  21
  22 static DEFINE_SPINLOCK(clkgena_divmux_lock);
  23 static DEFINE_SPINLOCK(clkgenf_lock);
  24
  25 static const char ** __init clkgen_mux_get_parents(struct device_node *np,
  26                                                        int *num_parents)
  27 {
  28         const char **parents;
  29         int nparents;
  30
  31         nparents = of_clk_get_parent_count(np);
  32         if (WARN_ON(nparents <= 0))
  33                 return ERR_PTR(-EINVAL);
  34
  35         parents = kcalloc(nparents, sizeof(const char *), GFP_KERNEL);
  36         if (!parents)
  37                 return ERR_PTR(-ENOMEM);
  38
  39         *num_parents = of_clk_parent_fill(np, parents, nparents);
  40         return parents;
  41 }
  42
  43 /**
  44  * DOC: Clock mux with a programmable divider on each of its three inputs.
  45  *      The mux has an input setting which effectively gates its output.
  46  *
  47  * Traits of this clock:
  48  * prepare - clk_(un)prepare only ensures parent is (un)prepared
  49  * enable - clk_enable and clk_disable are functional & control gating
  50  * rate - set rate is supported
  51  * parent - set/get parent
  52  */
  53
  54 #define NUM_INPUTS 3
  55
  56 struct clkgena_divmux {
  57         struct clk_hw hw;
  58         /* Subclassed mux and divider structures */
  59         struct clk_mux mux;
  60         struct clk_divider div[NUM_INPUTS];
  61         /* Enable/running feedback register bits for each input */
  62         void __iomem *feedback_reg[NUM_INPUTS];
  63         int feedback_bit_idx;
  64
  65         u8              muxsel;
  66 };
  67
  68 #define to_clkgena_divmux(_hw) container_of(_hw, struct clkgena_divmux, hw)
  69
  70 struct clkgena_divmux_data {
  71         int num_outputs;
  72         int mux_offset;
  73         int mux_offset2;
  74         int mux_start_bit;
  75         int div_offsets[NUM_INPUTS];
  76         int fb_offsets[NUM_INPUTS];
  77         int fb_start_bit_idx;
  78 };
  79
  80 #define CKGAX_CLKOPSRC_SWITCH_OFF 0x3
  81
  82 static int clkgena_divmux_is_running(struct clkgena_divmux *mux)
  83 {
  84         u32 regval = readl(mux->feedback_reg[mux->muxsel]);
  85         u32 running = regval & BIT(mux->feedback_bit_idx);
  86         return !!running;
  87 }
  88
  89 static int clkgena_divmux_enable(struct clk_hw *hw)
  90 {
  91         struct clkgena_divmux *genamux = to_clkgena_divmux(hw);
  92         struct clk_hw *mux_hw = &genamux->mux.hw;
  93         unsigned long timeout;
  94         int ret = 0;
  95
  96         __clk_hw_set_clk(mux_hw, hw);
  97
  98         ret = clk_mux_ops.set_parent(mux_hw, genamux->muxsel);
  99         if (ret)
 100                 return ret;
 101
 102         timeout = jiffies + msecs_to_jiffies(10);
 103
 104         while (!clkgena_divmux_is_running(genamux)) {
 105                 if (time_after(jiffies, timeout))
 106                         return -ETIMEDOUT;
 107                 cpu_relax();
 108         }
 109
 110         return 0;
 111 }
 112
 113 static void clkgena_divmux_disable(struct clk_hw *hw)
 114 {
 115         struct clkgena_divmux *genamux = to_clkgena_divmux(hw);
 116         struct clk_hw *mux_hw = &genamux->mux.hw;
 117
 118         __clk_hw_set_clk(mux_hw, hw);
 119
 120         clk_mux_ops.set_parent(mux_hw, CKGAX_CLKOPSRC_SWITCH_OFF);
 121 }
 122
 123 static int clkgena_divmux_is_enabled(struct clk_hw *hw)
 124 {
 125         struct clkgena_divmux *genamux = to_clkgena_divmux(hw);
 126         struct clk_hw *mux_hw = &genamux->mux.hw;
 127
 128         __clk_hw_set_clk(mux_hw, hw);
 129
 130         return (s8)clk_mux_ops.get_parent(mux_hw) > 0;
 131 }
 132
 133 static u8 clkgena_divmux_get_parent(struct clk_hw *hw)
 134 {
 135         struct clkgena_divmux *genamux = to_clkgena_divmux(hw);
 136         struct clk_hw *mux_hw = &genamux->mux.hw;
 137
 138         __clk_hw_set_clk(mux_hw, hw);
 139
 140         genamux->muxsel = clk_mux_ops.get_parent(mux_hw);
 141         if ((s8)genamux->muxsel < 0) {
 142                 pr_debug("%s: %s: Invalid parent, setting to default.\n",
 143                       __func__, clk_hw_get_name(hw));
 144                 genamux->muxsel = 0;
 145         }
 146
 147         return genamux->muxsel;
 148 }
 149
 150 static int clkgena_divmux_set_parent(struct clk_hw *hw, u8 index)
 151 {
 152         struct clkgena_divmux *genamux = to_clkgena_divmux(hw);
 153
 154         if (index >= CKGAX_CLKOPSRC_SWITCH_OFF)
 155                 return -EINVAL;
 156
 157         genamux->muxsel = index;
 158
 159         /*
 160          * If the mux is already enabled, call enable directly to set the
 161          * new mux position and wait for it to start running again. Otherwise
 162          * do nothing.
 163          */
 164         if (clkgena_divmux_is_enabled(hw))
 165                 clkgena_divmux_enable(hw);
 166
 167         return 0;
 168 }
 169
 170 static unsigned long clkgena_divmux_recalc_rate(struct clk_hw *hw,
 171                 unsigned long parent_rate)
 172 {
 173         struct clkgena_divmux *genamux = to_clkgena_divmux(hw);
 174         struct clk_hw *div_hw = &genamux->div[genamux->muxsel].hw;
 175
 176         __clk_hw_set_clk(div_hw, hw);
 177
 178         return clk_divider_ops.recalc_rate(div_hw, parent_rate);
 179 }
 180
 181 static int clkgena_divmux_set_rate(struct clk_hw *hw, unsigned long rate,
 182                                 unsigned long parent_rate)
 183 {
 184         struct clkgena_divmux *genamux = to_clkgena_divmux(hw);
 185         struct clk_hw *div_hw = &genamux->div[genamux->muxsel].hw;
 186
 187         __clk_hw_set_clk(div_hw, hw);
 188
 189         return clk_divider_ops.set_rate(div_hw, rate, parent_rate);
 190 }
 191
 192 static long clkgena_divmux_round_rate(struct clk_hw *hw, unsigned long rate,
 193                                    unsigned long *prate)
 194 {
 195         struct clkgena_divmux *genamux = to_clkgena_divmux(hw);
 196         struct clk_hw *div_hw = &genamux->div[genamux->muxsel].hw;
 197
 198         __clk_hw_set_clk(div_hw, hw);
 199
 200         return clk_divider_ops.round_rate(div_hw, rate, prate);
 201 }
 202
 203 static const struct clk_ops clkgena_divmux_ops = {
 204         .enable = clkgena_divmux_enable,
 205         .disable = clkgena_divmux_disable,
 206         .is_enabled = clkgena_divmux_is_enabled,
 207         .get_parent = clkgena_divmux_get_parent,
 208         .set_parent = clkgena_divmux_set_parent,
 209         .round_rate = clkgena_divmux_round_rate,
 210         .recalc_rate = clkgena_divmux_recalc_rate,
 211         .set_rate = clkgena_divmux_set_rate,
 212 };
 213
 214 /**
 215  * clk_register_genamux - register a genamux clock with the clock framework
 216  */
 217 static struct clk * __init clk_register_genamux(const char *name,
 218                                 const char **parent_names, u8 num_parents,
 219                                 void __iomem *reg,
 220                                 const struct clkgena_divmux_data *muxdata,
 221                                 u32 idx)
 222 {
 223         /*
 224          * Fixed constants across all ClockgenA variants
 225          */
 226         const int mux_width = 2;
 227         const int divider_width = 5;
 228         struct clkgena_divmux *genamux;
 229         struct clk *clk;
 230         struct clk_init_data init;
 231         int i;
 232
 233         genamux = kzalloc(sizeof(*genamux), GFP_KERNEL);
 234         if (!genamux)
 235                 return ERR_PTR(-ENOMEM);
 236
 237         init.name = name;
 238         init.ops = &clkgena_divmux_ops;
 239         init.flags = CLK_IS_BASIC | CLK_GET_RATE_NOCACHE;
 240         init.parent_names = parent_names;
 241         init.num_parents = num_parents;
 242
 243         genamux->mux.lock  = &clkgena_divmux_lock;
 244         genamux->mux.mask = BIT(mux_width) - 1;
 245         genamux->mux.shift = muxdata->mux_start_bit + (idx * mux_width);
 246         if (genamux->mux.shift > 31) {
 247                 /*
 248                  * We have spilled into the second mux register so
 249                  * adjust the register address and the bit shift accordingly
 250                  */
 251                 genamux->mux.reg = reg + muxdata->mux_offset2;
 252                 genamux->mux.shift -= 32;
 253         } else {
 254                 genamux->mux.reg   = reg + muxdata->mux_offset;
 255         }
 256
 257         for (i = 0; i < NUM_INPUTS; i++) {
 258                 /*
 259                  * Divider config for each input
 260                  */
 261                 void __iomem *divbase = reg + muxdata->div_offsets[i];
 262                 genamux->div[i].width = divider_width;
 263                 genamux->div[i].reg = divbase + (idx * sizeof(u32));
 264
 265                 /*
 266                  * Mux enabled/running feedback register for each input.
 267                  */
 268                 genamux->feedback_reg[i] = reg + muxdata->fb_offsets[i];
 269         }
 270
 271         genamux->feedback_bit_idx = muxdata->fb_start_bit_idx + idx;
 272         genamux->hw.init = &init;
 273
 274         clk = clk_register(NULL, &genamux->hw);
 275         if (IS_ERR(clk)) {
 276                 kfree(genamux);
 277                 goto err;
 278         }
 279
 280         pr_debug("%s: parent %s rate %lu\n",
 281                         __clk_get_name(clk),
 282                         __clk_get_name(clk_get_parent(clk)),
 283                         clk_get_rate(clk));
 284 err:
 285         return clk;
 286 }
 287
 288 static struct clkgena_divmux_data st_divmux_c65hs = {
 289         .num_outputs = 4,
 290         .mux_offset = 0x14,
 291         .mux_start_bit = 0,
 292         .div_offsets = { 0x800, 0x900, 0xb00 },
 293         .fb_offsets = { 0x18, 0x1c, 0x20 },
 294         .fb_start_bit_idx = 0,
 295 };
 296
 297 static struct clkgena_divmux_data st_divmux_c65ls = {
 298         .num_outputs = 14,
 299         .mux_offset = 0x14,
 300         .mux_offset2 = 0x24,
 301         .mux_start_bit = 8,
 302         .div_offsets = { 0x810, 0xa10, 0xb10 },
 303         .fb_offsets = { 0x18, 0x1c, 0x20 },
 304         .fb_start_bit_idx = 4,
 305 };
 306
 307 static struct clkgena_divmux_data st_divmux_c32odf0 = {
 308         .num_outputs = 8,
 309         .mux_offset = 0x1c,
 310         .mux_start_bit = 0,
 311         .div_offsets = { 0x800, 0x900, 0xa60 },
 312         .fb_offsets = { 0x2c, 0x24, 0x28 },
 313         .fb_start_bit_idx = 0,
 314 };
 315
 316 static struct clkgena_divmux_data st_divmux_c32odf1 = {
 317         .num_outputs = 8,
 318         .mux_offset = 0x1c,
 319         .mux_start_bit = 16,
 320         .div_offsets = { 0x820, 0x980, 0xa80 },
 321         .fb_offsets = { 0x2c, 0x24, 0x28 },
 322         .fb_start_bit_idx = 8,
 323 };
 324
 325 static struct clkgena_divmux_data st_divmux_c32odf2 = {
 326         .num_outputs = 8,
 327         .mux_offset = 0x20,
 328         .mux_start_bit = 0,
 329         .div_offsets = { 0x840, 0xa20, 0xb10 },
 330         .fb_offsets = { 0x2c, 0x24, 0x28 },
 331         .fb_start_bit_idx = 16,
 332 };
 333
 334 static struct clkgena_divmux_data st_divmux_c32odf3 = {
 335         .num_outputs = 8,
 336         .mux_offset = 0x20,
 337         .mux_start_bit = 16,
 338         .div_offsets = { 0x860, 0xa40, 0xb30 },
 339         .fb_offsets = { 0x2c, 0x24, 0x28 },
 340         .fb_start_bit_idx = 24,
 341 };
 342
 343 static const struct of_device_id clkgena_divmux_of_match[] = {
 344         {
 345                 .compatible = "st,clkgena-divmux-c65-hs",
 346                 .data = &st_divmux_c65hs,
 347         },
 348         {
 349                 .compatible = "st,clkgena-divmux-c65-ls",
 350                 .data = &st_divmux_c65ls,
 351         },
 352         {
 353                 .compatible = "st,clkgena-divmux-c32-odf0",
 354                 .data = &st_divmux_c32odf0,
 355         },
 356         {
 357                 .compatible = "st,clkgena-divmux-c32-odf1",
 358                 .data = &st_divmux_c32odf1,
 359         },
 360         {
 361                 .compatible = "st,clkgena-divmux-c32-odf2",
 362                 .data = &st_divmux_c32odf2,
 363         },
 364         {
 365                 .compatible = "st,clkgena-divmux-c32-odf3",
 366                 .data = &st_divmux_c32odf3,
 367         },
 368         {}
 369 };
 370
 371 static void __iomem * __init clkgen_get_register_base(struct device_node *np)
 372 {
 373         struct device_node *pnode;
 374         void __iomem *reg;
 375
 376         pnode = of_get_parent(np);
 377         if (!pnode)
 378                 return NULL;
 379
 380         reg = of_iomap(pnode, 0);
 381
 382         of_node_put(pnode);
 383         return reg;
 384 }
 385
 386 static void __init st_of_clkgena_divmux_setup(struct device_node *np)
 387 {
 388         const struct of_device_id *match;
 389         const struct clkgena_divmux_data *data;
 390         struct clk_onecell_data *clk_data;
 391         void __iomem *reg;
 392         const char **parents;
 393         int num_parents = 0, i;
 394
 395         match = of_match_node(clkgena_divmux_of_match, np);
 396         if (WARN_ON(!match))
 397                 return;
 398
 399         data = match->data;
 400
 401         reg = clkgen_get_register_base(np);
 402         if (!reg)
 403                 return;
 404
 405         parents = clkgen_mux_get_parents(np, &num_parents);
 406         if (IS_ERR(parents))
 407                 goto err_parents;
 408
 409         clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
 410         if (!clk_data)
 411                 goto err_alloc;
 412
 413         clk_data->clk_num = data->num_outputs;
 414         clk_data->clks = kcalloc(clk_data->clk_num, sizeof(struct clk *),
 415                                  GFP_KERNEL);
 416
 417         if (!clk_data->clks)
 418                 goto err_alloc_clks;
 419
 420         for (i = 0; i < clk_data->clk_num; i++) {
 421                 struct clk *clk;
 422                 const char *clk_name;
 423
 424                 if (of_property_read_string_index(np, "clock-output-names",
 425                                                   i, &clk_name))
 426                         break;
 427
 428                 /*
 429                  * If we read an empty clock name then the output is unused
 430                  */
 431                 if (*clk_name == '\0')
 432                         continue;
 433
 434                 clk = clk_register_genamux(clk_name, parents, num_parents,
 435                                            reg, data, i);
 436
 437                 if (IS_ERR(clk))
 438                         goto err;
 439
 440                 clk_data->clks[i] = clk;
 441         }
 442
 443         kfree(parents);
 444
 445         of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
 446         return;
 447 err:
 448         kfree(clk_data->clks);
 449 err_alloc_clks:
 450         kfree(clk_data);
 451 err_alloc:
 452         kfree(parents);
 453 err_parents:
 454         iounmap(reg);
 455 }
 456 CLK_OF_DECLARE(clkgenadivmux, "st,clkgena-divmux", st_of_clkgena_divmux_setup);
 457
 458 struct clkgena_prediv_data {
 459         u32 offset;
 460         u8 shift;
 461         struct clk_div_table *table;
 462 };
 463
 464 static struct clk_div_table prediv_table16[] = {
 465         { .val = 0, .div = 1 },
 466         { .val = 1, .div = 16 },
 467         { .div = 0 },
 468 };
 469
 470 static struct clkgena_prediv_data prediv_c65_data = {
 471         .offset = 0x4c,
 472         .shift = 31,
 473         .table = prediv_table16,
 474 };
 475
 476 static struct clkgena_prediv_data prediv_c32_data = {
 477         .offset = 0x50,
 478         .shift = 1,
 479         .table = prediv_table16,
 480 };
 481
 482 static const struct of_device_id clkgena_prediv_of_match[] = {
 483         { .compatible = "st,clkgena-prediv-c65", .data = &prediv_c65_data },
 484         { .compatible = "st,clkgena-prediv-c32", .data = &prediv_c32_data },
 485         {}
 486 };
 487
 488 static void __init st_of_clkgena_prediv_setup(struct device_node *np)
 489 {
 490         const struct of_device_id *match;
 491         void __iomem *reg;
 492         const char *parent_name, *clk_name;
 493         struct clk *clk;
 494         const struct clkgena_prediv_data *data;
 495
 496         match = of_match_node(clkgena_prediv_of_match, np);
 497         if (!match) {
 498                 pr_err("%s: No matching data\n", __func__);
 499                 return;
 500         }
 501
 502         data = match->data;
 503
 504         reg = clkgen_get_register_base(np);
 505         if (!reg)
 506                 return;
 507
 508         parent_name = of_clk_get_parent_name(np, 0);
 509         if (!parent_name)
 510                 goto err;
 511
 512         if (of_property_read_string_index(np, "clock-output-names",
 513                                           0, &clk_name))
 514                 goto err;
 515
 516         clk = clk_register_divider_table(NULL, clk_name, parent_name,
 517                                          CLK_GET_RATE_NOCACHE,
 518                                          reg + data->offset, data->shift, 1,
 519                                          0, data->table, NULL);
 520         if (IS_ERR(clk))
 521                 goto err;
 522
 523         of_clk_add_provider(np, of_clk_src_simple_get, clk);
 524         pr_debug("%s: parent %s rate %u\n",
 525                 __clk_get_name(clk),
 526                 __clk_get_name(clk_get_parent(clk)),
 527                 (unsigned int)clk_get_rate(clk));
 528
 529         return;
 530 err:
 531         iounmap(reg);
 532 }
 533 CLK_OF_DECLARE(clkgenaprediv, "st,clkgena-prediv", st_of_clkgena_prediv_setup);
 534
 535 struct clkgen_mux_data {
 536         u32 offset;
 537         u8 shift;
 538         u8 width;
 539         spinlock_t *lock;
 540         unsigned long clk_flags;
 541         u8 mux_flags;
 542 };
 543
 544 static struct clkgen_mux_data clkgen_mux_c_vcc_hd_416 = {
 545         .offset = 0,
 546         .shift = 0,
 547         .width = 1,
 548 };
 549
 550 static struct clkgen_mux_data clkgen_mux_f_vcc_fvdp_416 = {
 551         .offset = 0,
 552         .shift = 0,
 553         .width = 1,
 554 };
 555
 556 static struct clkgen_mux_data clkgen_mux_f_vcc_hva_416 = {
 557         .offset = 0,
 558         .shift = 0,
 559         .width = 1,
 560 };
 561
 562 static struct clkgen_mux_data clkgen_mux_f_vcc_hd_416 = {
 563         .offset = 0,
 564         .shift = 16,
 565         .width = 1,
 566         .lock = &clkgenf_lock,
 567 };
 568
 569 static struct clkgen_mux_data clkgen_mux_c_vcc_sd_416 = {
 570         .offset = 0,
 571         .shift = 17,
 572         .width = 1,
 573         .lock = &clkgenf_lock,
 574 };
 575
 576 static struct clkgen_mux_data stih415_a9_mux_data = {
 577         .offset = 0,
 578         .shift = 1,
 579         .width = 2,
 580         .lock = &clkgen_a9_lock,
 581 };
 582 static struct clkgen_mux_data stih416_a9_mux_data = {
 583         .offset = 0,
 584         .shift = 0,
 585         .width = 2,
 586 };
 587 static struct clkgen_mux_data stih407_a9_mux_data = {
 588         .offset = 0x1a4,
 589         .shift = 0,
 590         .width = 2,
 591         .lock = &clkgen_a9_lock,
 592 };
 593
 594 static const struct of_device_id mux_of_match[] = {
 595         {
 596                 .compatible = "st,stih416-clkgenc-vcc-hd",
 597                 .data = &clkgen_mux_c_vcc_hd_416,
 598         },
 599         {
 600                 .compatible = "st,stih416-clkgenf-vcc-fvdp",
 601                 .data = &clkgen_mux_f_vcc_fvdp_416,
 602         },
 603         {
 604                 .compatible = "st,stih416-clkgenf-vcc-hva",
 605                 .data = &clkgen_mux_f_vcc_hva_416,
 606         },
 607         {
 608                 .compatible = "st,stih416-clkgenf-vcc-hd",
 609                 .data = &clkgen_mux_f_vcc_hd_416,
 610         },
 611         {
 612                 .compatible = "st,stih416-clkgenf-vcc-sd",
 613                 .data = &clkgen_mux_c_vcc_sd_416,
 614         },
 615         {
 616                 .compatible = "st,stih415-clkgen-a9-mux",
 617                 .data = &stih415_a9_mux_data,
 618         },
 619         {
 620                 .compatible = "st,stih416-clkgen-a9-mux",
 621                 .data = &stih416_a9_mux_data,
 622         },
 623         {
 624                 .compatible = "st,stih407-clkgen-a9-mux",
 625                 .data = &stih407_a9_mux_data,
 626         },
 627         {}
 628 };
 629
 630 static void __init st_of_clkgen_mux_setup(struct device_node *np)
 631 {
 632         const struct of_device_id *match;
 633         struct clk *clk;
 634         void __iomem *reg;
 635         const char **parents;
 636         int num_parents;
 637         const struct clkgen_mux_data *data;
 638
 639         match = of_match_node(mux_of_match, np);
 640         if (!match) {
 641                 pr_err("%s: No matching data\n", __func__);
 642                 return;
 643         }
 644
 645         data = match->data;
 646
 647         reg = of_iomap(np, 0);
 648         if (!reg) {
 649                 pr_err("%s: Failed to get base address\n", __func__);
 650                 return;
 651         }
 652
 653         parents = clkgen_mux_get_parents(np, &num_parents);
 654         if (IS_ERR(parents)) {
 655                 pr_err("%s: Failed to get parents (%ld)\n",
 656                                 __func__, PTR_ERR(parents));
 657                 goto err_parents;
 658         }
 659
 660         clk = clk_register_mux(NULL, np->name, parents, num_parents,
 661                                 data->clk_flags | CLK_SET_RATE_PARENT,
 662                                 reg + data->offset,
 663                                 data->shift, data->width, data->mux_flags,
 664                                 data->lock);
 665         if (IS_ERR(clk))
 666                 goto err;
 667
 668         pr_debug("%s: parent %s rate %u\n",
 669                         __clk_get_name(clk),
 670                         __clk_get_name(clk_get_parent(clk)),
 671                         (unsigned int)clk_get_rate(clk));
 672
 673         kfree(parents);
 674         of_clk_add_provider(np, of_clk_src_simple_get, clk);
 675         return;
 676
 677 err:
 678         kfree(parents);
 679 err_parents:
 680         iounmap(reg);
 681 }
 682 CLK_OF_DECLARE(clkgen_mux, "st,clkgen-mux", st_of_clkgen_mux_setup);
 683
 684 #define VCC_MAX_CHANNELS 16
 685
 686 #define VCC_GATE_OFFSET 0x0
 687 #define VCC_MUX_OFFSET 0x4
 688 #define VCC_DIV_OFFSET 0x8
 689
 690 struct clkgen_vcc_data {
 691         spinlock_t *lock;
 692         unsigned long clk_flags;
 693 };
 694
 695 static struct clkgen_vcc_data st_clkgenc_vcc_416 = {
 696         .clk_flags = CLK_SET_RATE_PARENT,
 697 };
 698
 699 static struct clkgen_vcc_data st_clkgenf_vcc_416 = {
 700         .lock = &clkgenf_lock,
 701 };
 702
 703 static const struct of_device_id vcc_of_match[] = {
 704         { .compatible = "st,stih416-clkgenc", .data = &st_clkgenc_vcc_416 },
 705         { .compatible = "st,stih416-clkgenf", .data = &st_clkgenf_vcc_416 },
 706         {}
 707 };
 708
 709 static void __init st_of_clkgen_vcc_setup(struct device_node *np)
 710 {
 711         const struct of_device_id *match;
 712         void __iomem *reg;
 713         const char **parents;
 714         int num_parents, i;
 715         struct clk_onecell_data *clk_data;
 716         const struct clkgen_vcc_data *data;
 717
 718         match = of_match_node(vcc_of_match, np);
 719         if (WARN_ON(!match))
 720                 return;
 721         data = match->data;
 722
 723         reg = of_iomap(np, 0);
 724         if (!reg)
 725                 return;
 726
 727         parents = clkgen_mux_get_parents(np, &num_parents);
 728         if (IS_ERR(parents))
 729                 goto err_parents;
 730
 731         clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
 732         if (!clk_data)
 733                 goto err_alloc;
 734
 735         clk_data->clk_num = VCC_MAX_CHANNELS;
 736         clk_data->clks = kcalloc(clk_data->clk_num, sizeof(struct clk *),
 737                                  GFP_KERNEL);
 738
 739         if (!clk_data->clks)
 740                 goto err_alloc_clks;
 741
 742         for (i = 0; i < clk_data->clk_num; i++) {
 743                 struct clk *clk;
 744                 const char *clk_name;
 745                 struct clk_gate *gate;
 746                 struct clk_divider *div;
 747                 struct clk_mux *mux;
 748
 749                 if (of_property_read_string_index(np, "clock-output-names",
 750                                                   i, &clk_name))
 751                         break;
 752
 753                 /*
 754                  * If we read an empty clock name then the output is unused
 755                  */
 756                 if (*clk_name == '\0')
 757                         continue;
 758
 759                 gate = kzalloc(sizeof(*gate), GFP_KERNEL);
 760                 if (!gate)
 761                         goto err;
 762
 763                 div = kzalloc(sizeof(*div), GFP_KERNEL);
 764                 if (!div) {
 765                         kfree(gate);
 766                         goto err;
 767                 }
 768
 769                 mux = kzalloc(sizeof(*mux), GFP_KERNEL);
 770                 if (!mux) {
 771                         kfree(gate);
 772                         kfree(div);
 773                         goto err;
 774                 }
 775
 776                 gate->reg = reg + VCC_GATE_OFFSET;
 777                 gate->bit_idx = i;
 778                 gate->flags = CLK_GATE_SET_TO_DISABLE;
 779                 gate->lock = data->lock;
 780
 781                 div->reg = reg + VCC_DIV_OFFSET;
 782                 div->shift = 2 * i;
 783                 div->width = 2;
 784                 div->flags = CLK_DIVIDER_POWER_OF_TWO |
 785                         CLK_DIVIDER_ROUND_CLOSEST;
 786
 787                 mux->reg = reg + VCC_MUX_OFFSET;
 788                 mux->shift = 2 * i;
 789                 mux->mask = 0x3;
 790
 791                 clk = clk_register_composite(NULL, clk_name, parents,
 792                                              num_parents,
 793                                              &mux->hw, &clk_mux_ops,
 794                                              &div->hw, &clk_divider_ops,
 795                                              &gate->hw, &clk_gate_ops,
 796                                              data->clk_flags |
 797                                              CLK_GET_RATE_NOCACHE);
 798                 if (IS_ERR(clk)) {
 799                         kfree(gate);
 800                         kfree(div);
 801                         kfree(mux);
 802                         goto err;
 803                 }
 804
 805                 pr_debug("%s: parent %s rate %u\n",
 806                         __clk_get_name(clk),
 807                         __clk_get_name(clk_get_parent(clk)),
 808                         (unsigned int)clk_get_rate(clk));
 809
 810                 clk_data->clks[i] = clk;
 811         }
 812
 813         kfree(parents);
 814
 815         of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
 816         return;
 817
 818 err:
 819         for (i = 0; i < clk_data->clk_num; i++) {
 820                 struct clk_composite *composite;
 821
 822                 if (!clk_data->clks[i])
 823                         continue;
 824
 825                 composite = container_of(__clk_get_hw(clk_data->clks[i]),
 826                                          struct clk_composite, hw);
 827                 kfree(container_of(composite->gate_hw, struct clk_gate, hw));
 828                 kfree(container_of(composite->rate_hw, struct clk_divider, hw));
 829                 kfree(container_of(composite->mux_hw, struct clk_mux, hw));
 830         }
 831
 832         kfree(clk_data->clks);
 833 err_alloc_clks:
 834         kfree(clk_data);
 835 err_alloc:
 836         kfree(parents);
 837 err_parents:
 838         iounmap(reg);
 839 }
 840 CLK_OF_DECLARE(clkgen_vcc, "st,clkgen-vcc", st_of_clkgen_vcc_setup);