drivers/clk/berlin/bg2q.c

   1 /*
   2  * Copyright (c) 2014 Marvell Technology Group Ltd.
   3  *
   4  * Alexandre Belloni <alexandre.belloni@free-electrons.com>
   5  * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2, as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/clk.h>
  21 #include <linux/clk-provider.h>
  22 #include <linux/kernel.h>
  23 #include <linux/of.h>
  24 #include <linux/of_address.h>
  25 #include <linux/slab.h>
  26
  27 #include <dt-bindings/clock/berlin2q.h>
  28
  29 #include "berlin2-div.h"
  30 #include "berlin2-pll.h"
  31 #include "common.h"
  32
  33 #define REG_PINMUX0             0x0018
  34 #define REG_PINMUX5             0x002c
  35 #define REG_SYSPLLCTL0          0x0030
  36 #define REG_SYSPLLCTL4          0x0040
  37 #define REG_CLKENABLE           0x00e8
  38 #define REG_CLKSELECT0          0x00ec
  39 #define REG_CLKSELECT1          0x00f0
  40 #define REG_CLKSELECT2          0x00f4
  41 #define REG_CLKSWITCH0          0x00f8
  42 #define REG_CLKSWITCH1          0x00fc
  43 #define REG_SW_GENERIC0         0x0110
  44 #define REG_SW_GENERIC3         0x011c
  45 #define REG_SDIO0XIN_CLKCTL     0x0158
  46 #define REG_SDIO1XIN_CLKCTL     0x015c
  47
  48 #define MAX_CLKS 27
  49 static struct clk *clks[MAX_CLKS];
  50 static struct clk_onecell_data clk_data;
  51 static DEFINE_SPINLOCK(lock);
  52 static void __iomem *gbase;
  53 static void __iomem *cpupll_base;
  54
  55 enum {
  56         REFCLK,
  57         SYSPLL, CPUPLL,
  58         AVPLL_B1, AVPLL_B2, AVPLL_B3, AVPLL_B4,
  59         AVPLL_B5, AVPLL_B6, AVPLL_B7, AVPLL_B8,
  60 };
  61
  62 static const char *clk_names[] = {
  63         [REFCLK]                = "refclk",
  64         [SYSPLL]                = "syspll",
  65         [CPUPLL]                = "cpupll",
  66         [AVPLL_B1]              = "avpll_b1",
  67         [AVPLL_B2]              = "avpll_b2",
  68         [AVPLL_B3]              = "avpll_b3",
  69         [AVPLL_B4]              = "avpll_b4",
  70         [AVPLL_B5]              = "avpll_b5",
  71         [AVPLL_B6]              = "avpll_b6",
  72         [AVPLL_B7]              = "avpll_b7",
  73         [AVPLL_B8]              = "avpll_b8",
  74 };
  75
  76 static const struct berlin2_pll_map bg2q_pll_map __initconst = {
  77         .vcodiv         = {1, 0, 2, 0, 3, 4, 0, 6, 8},
  78         .mult           = 1,
  79         .fbdiv_shift    = 7,
  80         .rfdiv_shift    = 2,
  81         .divsel_shift   = 9,
  82 };
  83
  84 static const u8 default_parent_ids[] = {
  85         SYSPLL, AVPLL_B4, AVPLL_B5, AVPLL_B6, AVPLL_B7, SYSPLL
  86 };
  87
  88 static const struct berlin2_div_data bg2q_divs[] __initconst = {
  89         {
  90                 .name = "sys",
  91                 .parent_ids = default_parent_ids,
  92                 .num_parents = ARRAY_SIZE(default_parent_ids),
  93                 .map = {
  94                         BERLIN2_DIV_GATE(REG_CLKENABLE, 0),
  95                         BERLIN2_PLL_SELECT(REG_CLKSELECT0, 0),
  96                         BERLIN2_DIV_SELECT(REG_CLKSELECT0, 3),
  97                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 3),
  98                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 4),
  99                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH0, 5),
 100                 },
 101                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 102                 .flags = CLK_IGNORE_UNUSED,
 103         },
 104         {
 105                 .name = "drmfigo",
 106                 .parent_ids = default_parent_ids,
 107                 .num_parents = ARRAY_SIZE(default_parent_ids),
 108                 .map = {
 109                         BERLIN2_DIV_GATE(REG_CLKENABLE, 17),
 110                         BERLIN2_PLL_SELECT(REG_CLKSELECT0, 6),
 111                         BERLIN2_DIV_SELECT(REG_CLKSELECT0, 9),
 112                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 6),
 113                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 7),
 114                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH0, 8),
 115                 },
 116                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 117                 .flags = 0,
 118         },
 119         {
 120                 .name = "cfg",
 121                 .parent_ids = default_parent_ids,
 122                 .num_parents = ARRAY_SIZE(default_parent_ids),
 123                 .map = {
 124                         BERLIN2_DIV_GATE(REG_CLKENABLE, 1),
 125                         BERLIN2_PLL_SELECT(REG_CLKSELECT0, 12),
 126                         BERLIN2_DIV_SELECT(REG_CLKSELECT0, 15),
 127                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 9),
 128                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 10),
 129                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH0, 11),
 130                 },
 131                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 132                 .flags = 0,
 133         },
 134         {
 135                 .name = "gfx2d",
 136                 .parent_ids = default_parent_ids,
 137                 .num_parents = ARRAY_SIZE(default_parent_ids),
 138                 .map = {
 139                         BERLIN2_DIV_GATE(REG_CLKENABLE, 4),
 140                         BERLIN2_PLL_SELECT(REG_CLKSELECT0, 18),
 141                         BERLIN2_DIV_SELECT(REG_CLKSELECT0, 21),
 142                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 12),
 143                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 13),
 144                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH0, 14),
 145                 },
 146                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 147                 .flags = 0,
 148         },
 149         {
 150                 .name = "zsp",
 151                 .parent_ids = default_parent_ids,
 152                 .num_parents = ARRAY_SIZE(default_parent_ids),
 153                 .map = {
 154                         BERLIN2_DIV_GATE(REG_CLKENABLE, 6),
 155                         BERLIN2_PLL_SELECT(REG_CLKSELECT0, 24),
 156                         BERLIN2_DIV_SELECT(REG_CLKSELECT0, 27),
 157                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 15),
 158                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 16),
 159                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH0, 17),
 160                 },
 161                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 162                 .flags = 0,
 163         },
 164         {
 165                 .name = "perif",
 166                 .parent_ids = default_parent_ids,
 167                 .num_parents = ARRAY_SIZE(default_parent_ids),
 168                 .map = {
 169                         BERLIN2_DIV_GATE(REG_CLKENABLE, 7),
 170                         BERLIN2_PLL_SELECT(REG_CLKSELECT1, 0),
 171                         BERLIN2_DIV_SELECT(REG_CLKSELECT1, 3),
 172                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 18),
 173                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 19),
 174                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH0, 20),
 175                 },
 176                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 177                 .flags = CLK_IGNORE_UNUSED,
 178         },
 179         {
 180                 .name = "pcube",
 181                 .parent_ids = default_parent_ids,
 182                 .num_parents = ARRAY_SIZE(default_parent_ids),
 183                 .map = {
 184                         BERLIN2_DIV_GATE(REG_CLKENABLE, 2),
 185                         BERLIN2_PLL_SELECT(REG_CLKSELECT1, 6),
 186                         BERLIN2_DIV_SELECT(REG_CLKSELECT1, 9),
 187                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 21),
 188                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 22),
 189                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH0, 23),
 190                 },
 191                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 192                 .flags = 0,
 193         },
 194         {
 195                 .name = "vscope",
 196                 .parent_ids = default_parent_ids,
 197                 .num_parents = ARRAY_SIZE(default_parent_ids),
 198                 .map = {
 199                         BERLIN2_DIV_GATE(REG_CLKENABLE, 3),
 200                         BERLIN2_PLL_SELECT(REG_CLKSELECT1, 12),
 201                         BERLIN2_DIV_SELECT(REG_CLKSELECT1, 15),
 202                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 24),
 203                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 25),
 204                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH0, 26),
 205                 },
 206                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 207                 .flags = 0,
 208         },
 209         {
 210                 .name = "nfc_ecc",
 211                 .parent_ids = default_parent_ids,
 212                 .num_parents = ARRAY_SIZE(default_parent_ids),
 213                 .map = {
 214                         BERLIN2_DIV_GATE(REG_CLKENABLE, 19),
 215                         BERLIN2_PLL_SELECT(REG_CLKSELECT1, 18),
 216                         BERLIN2_DIV_SELECT(REG_CLKSELECT1, 21),
 217                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 27),
 218                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 28),
 219                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH0, 29),
 220                 },
 221                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 222                 .flags = 0,
 223         },
 224         {
 225                 .name = "vpp",
 226                 .parent_ids = default_parent_ids,
 227                 .num_parents = ARRAY_SIZE(default_parent_ids),
 228                 .map = {
 229                         BERLIN2_DIV_GATE(REG_CLKENABLE, 21),
 230                         BERLIN2_PLL_SELECT(REG_CLKSELECT1, 24),
 231                         BERLIN2_DIV_SELECT(REG_CLKSELECT1, 27),
 232                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH0, 30),
 233                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH0, 31),
 234                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH1, 0),
 235                 },
 236                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 237                 .flags = 0,
 238         },
 239         {
 240                 .name = "app",
 241                 .parent_ids = default_parent_ids,
 242                 .num_parents = ARRAY_SIZE(default_parent_ids),
 243                 .map = {
 244                         BERLIN2_DIV_GATE(REG_CLKENABLE, 20),
 245                         BERLIN2_PLL_SELECT(REG_CLKSELECT2, 0),
 246                         BERLIN2_DIV_SELECT(REG_CLKSELECT2, 3),
 247                         BERLIN2_PLL_SWITCH(REG_CLKSWITCH1, 1),
 248                         BERLIN2_DIV_SWITCH(REG_CLKSWITCH1, 2),
 249                         BERLIN2_DIV_D3SWITCH(REG_CLKSWITCH1, 3),
 250                 },
 251                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 252                 .flags = 0,
 253         },
 254         {
 255                 .name = "sdio0xin",
 256                 .parent_ids = default_parent_ids,
 257                 .num_parents = ARRAY_SIZE(default_parent_ids),
 258                 .map = {
 259                         BERLIN2_SINGLE_DIV(REG_SDIO0XIN_CLKCTL),
 260                 },
 261                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 262                 .flags = 0,
 263         },
 264         {
 265                 .name = "sdio1xin",
 266                 .parent_ids = default_parent_ids,
 267                 .num_parents = ARRAY_SIZE(default_parent_ids),
 268                 .map = {
 269                         BERLIN2_SINGLE_DIV(REG_SDIO1XIN_CLKCTL),
 270                 },
 271                 .div_flags = BERLIN2_DIV_HAS_GATE | BERLIN2_DIV_HAS_MUX,
 272                 .flags = 0,
 273         },
 274 };
 275
 276 static const struct berlin2_gate_data bg2q_gates[] __initconst = {
 277         { "gfx2daxi",   "perif",        5 },
 278         { "geth0",      "perif",        8 },
 279         { "sata",       "perif",        9 },
 280         { "ahbapb",     "perif",        10, CLK_IGNORE_UNUSED },
 281         { "usb0",       "perif",        11 },
 282         { "usb1",       "perif",        12 },
 283         { "usb2",       "perif",        13 },
 284         { "usb3",       "perif",        14 },
 285         { "pbridge",    "perif",        15, CLK_IGNORE_UNUSED },
 286         { "sdio",       "perif",        16, CLK_IGNORE_UNUSED },
 287         { "nfc",        "perif",        18 },
 288         { "pcie",       "perif",        22 },
 289 };
 290
 291 static void __init berlin2q_clock_setup(struct device_node *np)
 292 {
 293         const char *parent_names[9];
 294         struct clk *clk;
 295         int n;
 296
 297         gbase = of_iomap(np, 0);
 298         if (!gbase) {
 299                 pr_err("%s: Unable to map global base\n", np->full_name);
 300                 return;
 301         }
 302
 303         /* BG2Q CPU PLL is not part of global registers */
 304         cpupll_base = of_iomap(np, 1);
 305         if (!cpupll_base) {
 306                 pr_err("%s: Unable to map cpupll base\n", np->full_name);
 307                 iounmap(gbase);
 308                 return;
 309         }
 310
 311         /* overwrite default clock names with DT provided ones */
 312         clk = of_clk_get_by_name(np, clk_names[REFCLK]);
 313         if (!IS_ERR(clk)) {
 314                 clk_names[REFCLK] = __clk_get_name(clk);
 315                 clk_put(clk);
 316         }
 317
 318         /* simple register PLLs */
 319         clk = berlin2_pll_register(&bg2q_pll_map, gbase + REG_SYSPLLCTL0,
 320                                    clk_names[SYSPLL], clk_names[REFCLK], 0);
 321         if (IS_ERR(clk))
 322                 goto bg2q_fail;
 323
 324         clk = berlin2_pll_register(&bg2q_pll_map, cpupll_base,
 325                                    clk_names[CPUPLL], clk_names[REFCLK], 0);
 326         if (IS_ERR(clk))
 327                 goto bg2q_fail;
 328
 329         /* TODO: add BG2Q AVPLL */
 330
 331         /*
 332          * TODO: add reference clock bypass switches:
 333          * memPLLSWBypass, cpuPLLSWBypass, and sysPLLSWBypass
 334          */
 335
 336         /* clock divider cells */
 337         for (n = 0; n < ARRAY_SIZE(bg2q_divs); n++) {
 338                 const struct berlin2_div_data *dd = &bg2q_divs[n];
 339                 int k;
 340
 341                 for (k = 0; k < dd->num_parents; k++)
 342                         parent_names[k] = clk_names[dd->parent_ids[k]];
 343
 344                 clks[CLKID_SYS + n] = berlin2_div_register(&dd->map, gbase,
 345                                 dd->name, dd->div_flags, parent_names,
 346                                 dd->num_parents, dd->flags, &lock);
 347         }
 348
 349         /* clock gate cells */
 350         for (n = 0; n < ARRAY_SIZE(bg2q_gates); n++) {
 351                 const struct berlin2_gate_data *gd = &bg2q_gates[n];
 352
 353                 clks[CLKID_GFX2DAXI + n] = clk_register_gate(NULL, gd->name,
 354                             gd->parent_name, gd->flags, gbase + REG_CLKENABLE,
 355                             gd->bit_idx, 0, &lock);
 356         }
 357
 358         /*
 359          * twdclk is derived from cpu/3
 360          * TODO: use cpupll until cpuclk is not available
 361          */
 362         clks[CLKID_TWD] =
 363                 clk_register_fixed_factor(NULL, "twd", clk_names[CPUPLL],
 364                                           0, 1, 3);
 365
 366         /* check for errors on leaf clocks */
 367         for (n = 0; n < MAX_CLKS; n++) {
 368                 if (!IS_ERR(clks[n]))
 369                         continue;
 370
 371                 pr_err("%s: Unable to register leaf clock %d\n",
 372                        np->full_name, n);
 373                 goto bg2q_fail;
 374         }
 375
 376         /* register clk-provider */
 377         clk_data.clks = clks;
 378         clk_data.clk_num = MAX_CLKS;
 379         of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
 380
 381         return;
 382
 383 bg2q_fail:
 384         iounmap(cpupll_base);
 385         iounmap(gbase);
 386 }
 387 CLK_OF_DECLARE(berlin2q_clock, "marvell,berlin2q-chip-ctrl",
 388                berlin2q_clock_setup);