arch/sh/kernel/cpu/sh4a/clock-sh7723.c

   1 /*
   2  * arch/sh/kernel/cpu/sh4a/clock-sh7723.c
   3  *
   4  * SH7723 clock framework support
   5  *
   6  * Copyright (C) 2009 Magnus Damm
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/io.h>
  24 #include <linux/clk.h>
  25 #include <asm/clkdev.h>
  26 #include <asm/clock.h>
  27 #include <asm/hwblk.h>
  28 #include <cpu/sh7723.h>
  29
  30 /* SH7723 registers */
  31 #define FRQCR           0xa4150000
  32 #define VCLKCR          0xa4150004
  33 #define SCLKACR         0xa4150008
  34 #define SCLKBCR         0xa415000c
  35 #define IRDACLKCR       0xa4150018
  36 #define PLLCR           0xa4150024
  37 #define DLLFRQ          0xa4150050
  38
  39 /* Fixed 32 KHz root clock for RTC and Power Management purposes */
  40 static struct clk r_clk = {
  41         .rate           = 32768,
  42 };
  43
  44 /*
  45  * Default rate for the root input clock, reset this with clk_set_rate()
  46  * from the platform code.
  47  */
  48 struct clk extal_clk = {
  49         .rate           = 33333333,
  50 };
  51
  52 /* The dll multiplies the 32khz r_clk, may be used instead of extal */
  53 static unsigned long dll_recalc(struct clk *clk)
  54 {
  55         unsigned long mult;
  56
  57         if (__raw_readl(PLLCR) & 0x1000)
  58                 mult = __raw_readl(DLLFRQ);
  59         else
  60                 mult = 0;
  61
  62         return clk->parent->rate * mult;
  63 }
  64
  65 static struct clk_ops dll_clk_ops = {
  66         .recalc         = dll_recalc,
  67 };
  68
  69 static struct clk dll_clk = {
  70         .ops            = &dll_clk_ops,
  71         .parent         = &r_clk,
  72         .flags          = CLK_ENABLE_ON_INIT,
  73 };
  74
  75 static unsigned long pll_recalc(struct clk *clk)
  76 {
  77         unsigned long mult = 1;
  78         unsigned long div = 1;
  79
  80         if (__raw_readl(PLLCR) & 0x4000)
  81                 mult = (((__raw_readl(FRQCR) >> 24) & 0x1f) + 1);
  82         else
  83                 div = 2;
  84
  85         return (clk->parent->rate * mult) / div;
  86 }
  87
  88 static struct clk_ops pll_clk_ops = {
  89         .recalc         = pll_recalc,
  90 };
  91
  92 static struct clk pll_clk = {
  93         .ops            = &pll_clk_ops,
  94         .flags          = CLK_ENABLE_ON_INIT,
  95 };
  96
  97 struct clk *main_clks[] = {
  98         &r_clk,
  99         &extal_clk,
 100         &dll_clk,
 101         &pll_clk,
 102 };
 103
 104 static int multipliers[] = { 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
 105 static int divisors[] = { 1, 3, 2, 5, 3, 4, 5, 6, 8, 10, 12, 16, 20 };
 106
 107 static struct clk_div_mult_table div4_div_mult_table = {
 108         .divisors = divisors,
 109         .nr_divisors = ARRAY_SIZE(divisors),
 110         .multipliers = multipliers,
 111         .nr_multipliers = ARRAY_SIZE(multipliers),
 112 };
 113
 114 static struct clk_div4_table div4_table = {
 115         .div_mult_table = &div4_div_mult_table,
 116 };
 117
 118 enum { DIV4_I, DIV4_U, DIV4_SH, DIV4_B, DIV4_B3, DIV4_P, DIV4_NR };
 119
 120 #define DIV4(_reg, _bit, _mask, _flags) \
 121   SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
 122
 123 struct clk div4_clks[DIV4_NR] = {
 124         [DIV4_I] = DIV4(FRQCR, 20, 0x0dbf, CLK_ENABLE_ON_INIT),
 125         [DIV4_U] = DIV4(FRQCR, 16, 0x0dbf, CLK_ENABLE_ON_INIT),
 126         [DIV4_SH] = DIV4(FRQCR, 12, 0x0dbf, CLK_ENABLE_ON_INIT),
 127         [DIV4_B] = DIV4(FRQCR, 8, 0x0dbf, CLK_ENABLE_ON_INIT),
 128         [DIV4_B3] = DIV4(FRQCR, 4, 0x0db4, CLK_ENABLE_ON_INIT),
 129         [DIV4_P] = DIV4(FRQCR, 0, 0x0dbf, 0),
 130 };
 131
 132 enum { DIV4_IRDA, DIV4_ENABLE_NR };
 133
 134 struct clk div4_enable_clks[DIV4_ENABLE_NR] = {
 135         [DIV4_IRDA] = DIV4(IRDACLKCR, 0, 0x0dbf, 0),
 136 };
 137
 138 enum { DIV4_SIUA, DIV4_SIUB, DIV4_REPARENT_NR };
 139
 140 struct clk div4_reparent_clks[DIV4_REPARENT_NR] = {
 141         [DIV4_SIUA] = DIV4(SCLKACR, 0, 0x0dbf, 0),
 142         [DIV4_SIUB] = DIV4(SCLKBCR, 0, 0x0dbf, 0),
 143 };
 144 enum { DIV6_V, DIV6_NR };
 145
 146 struct clk div6_clks[DIV6_NR] = {
 147         [DIV6_V] = SH_CLK_DIV6(&pll_clk, VCLKCR, 0),
 148 };
 149
 150 static struct clk mstp_clks[] = {
 151         /* See page 60 of Datasheet V1.0: Overview -> Block Diagram */
 152         SH_HWBLK_CLK(HWBLK_TLB, &div4_clks[DIV4_I], CLK_ENABLE_ON_INIT),
 153         SH_HWBLK_CLK(HWBLK_IC, &div4_clks[DIV4_I], CLK_ENABLE_ON_INIT),
 154         SH_HWBLK_CLK(HWBLK_OC, &div4_clks[DIV4_I], CLK_ENABLE_ON_INIT),
 155         SH_HWBLK_CLK(HWBLK_L2C, &div4_clks[DIV4_SH], CLK_ENABLE_ON_INIT),
 156         SH_HWBLK_CLK(HWBLK_ILMEM, &div4_clks[DIV4_I], CLK_ENABLE_ON_INIT),
 157         SH_HWBLK_CLK(HWBLK_FPU, &div4_clks[DIV4_I], CLK_ENABLE_ON_INIT),
 158         SH_HWBLK_CLK(HWBLK_INTC, &div4_clks[DIV4_I], CLK_ENABLE_ON_INIT),
 159         SH_HWBLK_CLK(HWBLK_DMAC0, &div4_clks[DIV4_B], 0),
 160         SH_HWBLK_CLK(HWBLK_SHYWAY, &div4_clks[DIV4_SH], CLK_ENABLE_ON_INIT),
 161         SH_HWBLK_CLK(HWBLK_HUDI, &div4_clks[DIV4_P], 0),
 162         SH_HWBLK_CLK(HWBLK_UBC, &div4_clks[DIV4_I], 0),
 163         SH_HWBLK_CLK(HWBLK_TMU0, &div4_clks[DIV4_P], 0),
 164         SH_HWBLK_CLK(HWBLK_CMT, &r_clk, 0),
 165         SH_HWBLK_CLK(HWBLK_RWDT, &r_clk, 0),
 166         SH_HWBLK_CLK(HWBLK_DMAC1, &div4_clks[DIV4_B], 0),
 167         SH_HWBLK_CLK(HWBLK_TMU1, &div4_clks[DIV4_P], 0),
 168         SH_HWBLK_CLK(HWBLK_FLCTL, &div4_clks[DIV4_P], 0),
 169         SH_HWBLK_CLK(HWBLK_SCIF0, &div4_clks[DIV4_P], 0),
 170         SH_HWBLK_CLK(HWBLK_SCIF1, &div4_clks[DIV4_P], 0),
 171         SH_HWBLK_CLK(HWBLK_SCIF2, &div4_clks[DIV4_P], 0),
 172         SH_HWBLK_CLK(HWBLK_SCIF3, &div4_clks[DIV4_B], 0),
 173         SH_HWBLK_CLK(HWBLK_SCIF4, &div4_clks[DIV4_B], 0),
 174         SH_HWBLK_CLK(HWBLK_SCIF5, &div4_clks[DIV4_B], 0),
 175         SH_HWBLK_CLK(HWBLK_MSIOF0, &div4_clks[DIV4_B], 0),
 176         SH_HWBLK_CLK(HWBLK_MSIOF1, &div4_clks[DIV4_B], 0),
 177         SH_HWBLK_CLK(HWBLK_MERAM, &div4_clks[DIV4_SH], 0),
 178
 179         SH_HWBLK_CLK(HWBLK_IIC, &div4_clks[DIV4_P], 0),
 180         SH_HWBLK_CLK(HWBLK_RTC, &r_clk, 0),
 181
 182         SH_HWBLK_CLK(HWBLK_ATAPI, &div4_clks[DIV4_SH], 0),
 183         SH_HWBLK_CLK(HWBLK_ADC, &div4_clks[DIV4_P], 0),
 184         SH_HWBLK_CLK(HWBLK_TPU, &div4_clks[DIV4_B], 0),
 185         SH_HWBLK_CLK(HWBLK_IRDA, &div4_clks[DIV4_P], 0),
 186         SH_HWBLK_CLK(HWBLK_TSIF, &div4_clks[DIV4_B], 0),
 187         SH_HWBLK_CLK(HWBLK_ICB, &div4_clks[DIV4_B], CLK_ENABLE_ON_INIT),
 188         SH_HWBLK_CLK(HWBLK_SDHI0, &div4_clks[DIV4_B], 0),
 189         SH_HWBLK_CLK(HWBLK_SDHI1, &div4_clks[DIV4_B], 0),
 190         SH_HWBLK_CLK(HWBLK_KEYSC, &r_clk, 0),
 191         SH_HWBLK_CLK(HWBLK_USB, &div4_clks[DIV4_B], 0),
 192         SH_HWBLK_CLK(HWBLK_2DG, &div4_clks[DIV4_B], 0),
 193         SH_HWBLK_CLK(HWBLK_SIU, &div4_clks[DIV4_B], 0),
 194         SH_HWBLK_CLK(HWBLK_VEU2H1, &div4_clks[DIV4_B], 0),
 195         SH_HWBLK_CLK(HWBLK_VOU, &div4_clks[DIV4_B], 0),
 196         SH_HWBLK_CLK(HWBLK_BEU, &div4_clks[DIV4_B], 0),
 197         SH_HWBLK_CLK(HWBLK_CEU, &div4_clks[DIV4_B], 0),
 198         SH_HWBLK_CLK(HWBLK_VEU2H0, &div4_clks[DIV4_B], 0),
 199         SH_HWBLK_CLK(HWBLK_VPU, &div4_clks[DIV4_B], 0),
 200         SH_HWBLK_CLK(HWBLK_LCDC, &div4_clks[DIV4_B], 0),
 201 };
 202
 203 #define CLKDEV_CON_ID(_id, _clk) { .con_id = _id, .clk = _clk }
 204
 205 static struct clk_lookup lookups[] = {
 206         /* main clocks */
 207         CLKDEV_CON_ID("rclk", &r_clk),
 208         CLKDEV_CON_ID("extal", &extal_clk),
 209         CLKDEV_CON_ID("dll_clk", &dll_clk),
 210         CLKDEV_CON_ID("pll_clk", &pll_clk),
 211
 212         /* DIV4 clocks */
 213         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
 214         CLKDEV_CON_ID("umem_clk", &div4_clks[DIV4_U]),
 215         CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
 216         CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
 217         CLKDEV_CON_ID("b3_clk", &div4_clks[DIV4_B3]),
 218         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 219         CLKDEV_CON_ID("irda_clk", &div4_enable_clks[DIV4_IRDA]),
 220         CLKDEV_CON_ID("siua_clk", &div4_reparent_clks[DIV4_SIUA]),
 221         CLKDEV_CON_ID("siub_clk", &div4_reparent_clks[DIV4_SIUB]),
 222
 223         /* DIV6 clocks */
 224         CLKDEV_CON_ID("video_clk", &div6_clks[DIV6_V]),
 225
 226         /* MSTP clocks */
 227         CLKDEV_CON_ID("tlb0", &mstp_clks[HWBLK_TLB]),
 228         CLKDEV_CON_ID("ic0", &mstp_clks[HWBLK_IC]),
 229         CLKDEV_CON_ID("oc0", &mstp_clks[HWBLK_OC]),
 230         CLKDEV_CON_ID("l2c0", &mstp_clks[HWBLK_L2C]),
 231         CLKDEV_CON_ID("ilmem0", &mstp_clks[HWBLK_ILMEM]),
 232         CLKDEV_CON_ID("fpu0", &mstp_clks[HWBLK_FPU]),
 233         CLKDEV_CON_ID("intc0", &mstp_clks[HWBLK_INTC]),
 234         CLKDEV_CON_ID("dmac0", &mstp_clks[HWBLK_DMAC0]),
 235         CLKDEV_CON_ID("sh0", &mstp_clks[HWBLK_SHYWAY]),
 236         CLKDEV_CON_ID("hudi0", &mstp_clks[HWBLK_HUDI]),
 237         CLKDEV_CON_ID("ubc0", &mstp_clks[HWBLK_UBC]),
 238         {
 239                 /* TMU0 */
 240                 .dev_id         = "sh_tmu.0",
 241                 .con_id         = "tmu_fck",
 242                 .clk            = &mstp_clks[HWBLK_TMU0],
 243         }, {
 244                 /* TMU1 */
 245                 .dev_id         = "sh_tmu.1",
 246                 .con_id         = "tmu_fck",
 247                 .clk            = &mstp_clks[HWBLK_TMU0],
 248         }, {
 249                 /* TMU2 */
 250                 .dev_id         = "sh_tmu.2",
 251                 .con_id         = "tmu_fck",
 252                 .clk            = &mstp_clks[HWBLK_TMU0],
 253         },
 254         CLKDEV_CON_ID("cmt_fck", &mstp_clks[HWBLK_CMT]),
 255         CLKDEV_CON_ID("rwdt0", &mstp_clks[HWBLK_RWDT]),
 256         CLKDEV_CON_ID("dmac1", &mstp_clks[HWBLK_DMAC1]),
 257         {
 258                 /* TMU3 */
 259                 .dev_id         = "sh_tmu.3",
 260                 .con_id         = "tmu_fck",
 261                 .clk            = &mstp_clks[HWBLK_TMU1],
 262         }, {
 263                 /* TMU4 */
 264                 .dev_id         = "sh_tmu.4",
 265                 .con_id         = "tmu_fck",
 266                 .clk            = &mstp_clks[HWBLK_TMU1],
 267         }, {
 268                 /* TMU5 */
 269                 .dev_id         = "sh_tmu.5",
 270                 .con_id         = "tmu_fck",
 271                 .clk            = &mstp_clks[HWBLK_TMU1],
 272         },
 273         CLKDEV_CON_ID("flctl0", &mstp_clks[HWBLK_FLCTL]),
 274         {
 275                 /* SCIF0 */
 276                 .dev_id         = "sh-sci.0",
 277                 .con_id         = "sci_fck",
 278                 .clk            = &mstp_clks[HWBLK_SCIF0],
 279         }, {
 280                 /* SCIF1 */
 281                 .dev_id         = "sh-sci.1",
 282                 .con_id         = "sci_fck",
 283                 .clk            = &mstp_clks[HWBLK_SCIF1],
 284         }, {
 285                 /* SCIF2 */
 286                 .dev_id         = "sh-sci.2",
 287                 .con_id         = "sci_fck",
 288                 .clk            = &mstp_clks[HWBLK_SCIF2],
 289         }, {
 290                 /* SCIF3 */
 291                 .dev_id         = "sh-sci.3",
 292                 .con_id         = "sci_fck",
 293                 .clk            = &mstp_clks[HWBLK_SCIF3],
 294         }, {
 295                 /* SCIF4 */
 296                 .dev_id         = "sh-sci.4",
 297                 .con_id         = "sci_fck",
 298                 .clk            = &mstp_clks[HWBLK_SCIF4],
 299         }, {
 300                 /* SCIF5 */
 301                 .dev_id         = "sh-sci.5",
 302                 .con_id         = "sci_fck",
 303                 .clk            = &mstp_clks[HWBLK_SCIF5],
 304         },
 305         CLKDEV_CON_ID("msiof0", &mstp_clks[HWBLK_MSIOF0]),
 306         CLKDEV_CON_ID("msiof1", &mstp_clks[HWBLK_MSIOF1]),
 307         CLKDEV_CON_ID("meram0", &mstp_clks[HWBLK_MERAM]),
 308         CLKDEV_CON_ID("i2c0", &mstp_clks[HWBLK_IIC]),
 309         CLKDEV_CON_ID("rtc0", &mstp_clks[HWBLK_RTC]),
 310         CLKDEV_CON_ID("atapi0", &mstp_clks[HWBLK_ATAPI]),
 311         CLKDEV_CON_ID("adc0", &mstp_clks[HWBLK_ADC]),
 312         CLKDEV_CON_ID("tpu0", &mstp_clks[HWBLK_TPU]),
 313         CLKDEV_CON_ID("irda0", &mstp_clks[HWBLK_IRDA]),
 314         CLKDEV_CON_ID("tsif0", &mstp_clks[HWBLK_TSIF]),
 315         CLKDEV_CON_ID("icb0", &mstp_clks[HWBLK_ICB]),
 316         CLKDEV_CON_ID("sdhi0", &mstp_clks[HWBLK_SDHI0]),
 317         CLKDEV_CON_ID("sdhi1", &mstp_clks[HWBLK_SDHI1]),
 318         CLKDEV_CON_ID("keysc0", &mstp_clks[HWBLK_KEYSC]),
 319         CLKDEV_CON_ID("usb0", &mstp_clks[HWBLK_USB]),
 320         CLKDEV_CON_ID("2dg0", &mstp_clks[HWBLK_2DG]),
 321         CLKDEV_CON_ID("siu0", &mstp_clks[HWBLK_SIU]),
 322         CLKDEV_CON_ID("veu1", &mstp_clks[HWBLK_VEU2H1]),
 323         CLKDEV_CON_ID("vou0", &mstp_clks[HWBLK_VOU]),
 324         CLKDEV_CON_ID("beu0", &mstp_clks[HWBLK_BEU]),
 325         CLKDEV_CON_ID("ceu0", &mstp_clks[HWBLK_CEU]),
 326         CLKDEV_CON_ID("veu0", &mstp_clks[HWBLK_VEU2H0]),
 327         CLKDEV_CON_ID("vpu0", &mstp_clks[HWBLK_VPU]),
 328         CLKDEV_CON_ID("lcdc0", &mstp_clks[HWBLK_LCDC]),
 329 };
 330
 331 int __init arch_clk_init(void)
 332 {
 333         int k, ret = 0;
 334
 335         /* autodetect extal or dll configuration */
 336         if (__raw_readl(PLLCR) & 0x1000)
 337                 pll_clk.parent = &dll_clk;
 338         else
 339                 pll_clk.parent = &extal_clk;
 340
 341         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 342                 ret |= clk_register(main_clks[k]);
 343
 344         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 345
 346         if (!ret)
 347                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 348
 349         if (!ret)
 350                 ret = sh_clk_div4_enable_register(div4_enable_clks,
 351                                         DIV4_ENABLE_NR, &div4_table);
 352
 353         if (!ret)
 354                 ret = sh_clk_div4_reparent_register(div4_reparent_clks,
 355                                         DIV4_REPARENT_NR, &div4_table);
 356
 357         if (!ret)
 358                 ret = sh_clk_div6_register(div6_clks, DIV6_NR);
 359
 360         if (!ret)
 361                 ret = sh_hwblk_clk_register(mstp_clks, HWBLK_NR);
 362
 363         return ret;
 364 }