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 <linux/clkdev.h>
  26 #include <linux/sh_clk.h>
  27 #include <asm/clock.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 MSTPCR0         0xa4150030
  38 #define MSTPCR1         0xa4150034
  39 #define MSTPCR2         0xa4150038
  40 #define DLLFRQ          0xa4150050
  41
  42 /* Fixed 32 KHz root clock for RTC and Power Management purposes */
  43 static struct clk r_clk = {
  44         .rate           = 32768,
  45 };
  46
  47 /*
  48  * Default rate for the root input clock, reset this with clk_set_rate()
  49  * from the platform code.
  50  */
  51 struct clk extal_clk = {
  52         .rate           = 33333333,
  53 };
  54
  55 /* The dll multiplies the 32khz r_clk, may be used instead of extal */
  56 static unsigned long dll_recalc(struct clk *clk)
  57 {
  58         unsigned long mult;
  59
  60         if (__raw_readl(PLLCR) & 0x1000)
  61                 mult = __raw_readl(DLLFRQ);
  62         else
  63                 mult = 0;
  64
  65         return clk->parent->rate * mult;
  66 }
  67
  68 static struct sh_clk_ops dll_clk_ops = {
  69         .recalc         = dll_recalc,
  70 };
  71
  72 static struct clk dll_clk = {
  73         .ops            = &dll_clk_ops,
  74         .parent         = &r_clk,
  75         .flags          = CLK_ENABLE_ON_INIT,
  76 };
  77
  78 static unsigned long pll_recalc(struct clk *clk)
  79 {
  80         unsigned long mult = 1;
  81         unsigned long div = 1;
  82
  83         if (__raw_readl(PLLCR) & 0x4000)
  84                 mult = (((__raw_readl(FRQCR) >> 24) & 0x1f) + 1);
  85         else
  86                 div = 2;
  87
  88         return (clk->parent->rate * mult) / div;
  89 }
  90
  91 static struct sh_clk_ops pll_clk_ops = {
  92         .recalc         = pll_recalc,
  93 };
  94
  95 static struct clk pll_clk = {
  96         .ops            = &pll_clk_ops,
  97         .flags          = CLK_ENABLE_ON_INIT,
  98 };
  99
 100 struct clk *main_clks[] = {
 101         &r_clk,
 102         &extal_clk,
 103         &dll_clk,
 104         &pll_clk,
 105 };
 106
 107 static int multipliers[] = { 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
 108 static int divisors[] = { 1, 3, 2, 5, 3, 4, 5, 6, 8, 10, 12, 16, 20 };
 109
 110 static struct clk_div_mult_table div4_div_mult_table = {
 111         .divisors = divisors,
 112         .nr_divisors = ARRAY_SIZE(divisors),
 113         .multipliers = multipliers,
 114         .nr_multipliers = ARRAY_SIZE(multipliers),
 115 };
 116
 117 static struct clk_div4_table div4_table = {
 118         .div_mult_table = &div4_div_mult_table,
 119 };
 120
 121 enum { DIV4_I, DIV4_U, DIV4_SH, DIV4_B, DIV4_B3, DIV4_P, DIV4_NR };
 122
 123 #define DIV4(_reg, _bit, _mask, _flags) \
 124   SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
 125
 126 struct clk div4_clks[DIV4_NR] = {
 127         [DIV4_I] = DIV4(FRQCR, 20, 0x0dbf, CLK_ENABLE_ON_INIT),
 128         [DIV4_U] = DIV4(FRQCR, 16, 0x0dbf, CLK_ENABLE_ON_INIT),
 129         [DIV4_SH] = DIV4(FRQCR, 12, 0x0dbf, CLK_ENABLE_ON_INIT),
 130         [DIV4_B] = DIV4(FRQCR, 8, 0x0dbf, CLK_ENABLE_ON_INIT),
 131         [DIV4_B3] = DIV4(FRQCR, 4, 0x0db4, CLK_ENABLE_ON_INIT),
 132         [DIV4_P] = DIV4(FRQCR, 0, 0x0dbf, 0),
 133 };
 134
 135 enum { DIV4_IRDA, DIV4_ENABLE_NR };
 136
 137 struct clk div4_enable_clks[DIV4_ENABLE_NR] = {
 138         [DIV4_IRDA] = DIV4(IRDACLKCR, 0, 0x0dbf, 0),
 139 };
 140
 141 enum { DIV4_SIUA, DIV4_SIUB, DIV4_REPARENT_NR };
 142
 143 struct clk div4_reparent_clks[DIV4_REPARENT_NR] = {
 144         [DIV4_SIUA] = DIV4(SCLKACR, 0, 0x0dbf, 0),
 145         [DIV4_SIUB] = DIV4(SCLKBCR, 0, 0x0dbf, 0),
 146 };
 147 enum { DIV6_V, DIV6_NR };
 148
 149 struct clk div6_clks[DIV6_NR] = {
 150         [DIV6_V] = SH_CLK_DIV6(&pll_clk, VCLKCR, 0),
 151 };
 152
 153 static struct clk mstp_clks[] = {
 154         /* See page 60 of Datasheet V1.0: Overview -> Block Diagram */
 155         [HWBLK_TLB]    = SH_CLK_MSTP32(&div4_clks[DIV4_I],  MSTPCR0, 31, CLK_ENABLE_ON_INIT),
 156         [HWBLK_IC]     = SH_CLK_MSTP32(&div4_clks[DIV4_I],  MSTPCR0, 30, CLK_ENABLE_ON_INIT),
 157         [HWBLK_OC]     = SH_CLK_MSTP32(&div4_clks[DIV4_I],  MSTPCR0, 29, CLK_ENABLE_ON_INIT),
 158         [HWBLK_L2C]    = SH_CLK_MSTP32(&div4_clks[DIV4_SH], MSTPCR0, 28, CLK_ENABLE_ON_INIT),
 159         [HWBLK_ILMEM]  = SH_CLK_MSTP32(&div4_clks[DIV4_I],  MSTPCR0, 27, CLK_ENABLE_ON_INIT),
 160         [HWBLK_FPU]    = SH_CLK_MSTP32(&div4_clks[DIV4_I],  MSTPCR0, 24, CLK_ENABLE_ON_INIT),
 161         [HWBLK_INTC]   = SH_CLK_MSTP32(&div4_clks[DIV4_I],  MSTPCR0, 22, CLK_ENABLE_ON_INIT),
 162         [HWBLK_DMAC0]  = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR0, 21, 0),
 163         [HWBLK_SHYWAY] = SH_CLK_MSTP32(&div4_clks[DIV4_SH], MSTPCR0, 20, CLK_ENABLE_ON_INIT),
 164         [HWBLK_HUDI]   = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR0, 19, 0),
 165         [HWBLK_UBC]    = SH_CLK_MSTP32(&div4_clks[DIV4_I],  MSTPCR0, 17, 0),
 166         [HWBLK_TMU0]   = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR0, 15, 0),
 167         [HWBLK_CMT]    = SH_CLK_MSTP32(&r_clk,              MSTPCR0, 14, 0),
 168         [HWBLK_RWDT]   = SH_CLK_MSTP32(&r_clk,              MSTPCR0, 13, 0),
 169         [HWBLK_DMAC1]  = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR0, 12, 0),
 170         [HWBLK_TMU1]   = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR0, 11, 0),
 171         [HWBLK_FLCTL]  = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR0, 10, 0),
 172         [HWBLK_SCIF0]  = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR0, 9, 0),
 173         [HWBLK_SCIF1]  = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR0, 8, 0),
 174         [HWBLK_SCIF2]  = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR0, 7, 0),
 175         [HWBLK_SCIF3]  = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR0, 6, 0),
 176         [HWBLK_SCIF4]  = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR0, 5, 0),
 177         [HWBLK_SCIF5]  = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR0, 4, 0),
 178         [HWBLK_MSIOF0] = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR0, 2, 0),
 179         [HWBLK_MSIOF1] = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR0, 1, 0),
 180         [HWBLK_MERAM]  = SH_CLK_MSTP32(&div4_clks[DIV4_SH], MSTPCR0, 0, 0),
 181
 182         [HWBLK_IIC]    = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR1, 9, 0),
 183         [HWBLK_RTC]    = SH_CLK_MSTP32(&r_clk,              MSTPCR1, 8, 0),
 184
 185         [HWBLK_ATAPI]  = SH_CLK_MSTP32(&div4_clks[DIV4_SH], MSTPCR2, 28, 0),
 186         [HWBLK_ADC]    = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR2, 27, 0),
 187         [HWBLK_TPU]    = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 25, 0),
 188         [HWBLK_IRDA]   = SH_CLK_MSTP32(&div4_clks[DIV4_P],  MSTPCR2, 24, 0),
 189         [HWBLK_TSIF]   = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 22, 0),
 190         [HWBLK_ICB]    = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 21, CLK_ENABLE_ON_INIT),
 191         [HWBLK_SDHI0]  = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 18, 0),
 192         [HWBLK_SDHI1]  = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 17, 0),
 193         [HWBLK_KEYSC]  = SH_CLK_MSTP32(&r_clk,              MSTPCR2, 14, 0),
 194         [HWBLK_USB]    = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 11, 0),
 195         [HWBLK_2DG]    = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 10, 0),
 196         [HWBLK_SIU]    = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 8, 0),
 197         [HWBLK_VEU2H1] = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 6, 0),
 198         [HWBLK_VOU]    = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 5, 0),
 199         [HWBLK_BEU]    = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 4, 0),
 200         [HWBLK_CEU]    = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 3, 0),
 201         [HWBLK_VEU2H0] = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 2, 0),
 202         [HWBLK_VPU]    = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 1, 0),
 203         [HWBLK_LCDC]   = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR2, 0, 0),
 204 };
 205
 206 static struct clk_lookup lookups[] = {
 207         /* main clocks */
 208         CLKDEV_CON_ID("rclk", &r_clk),
 209         CLKDEV_CON_ID("extal", &extal_clk),
 210         CLKDEV_CON_ID("dll_clk", &dll_clk),
 211         CLKDEV_CON_ID("pll_clk", &pll_clk),
 212
 213         /* DIV4 clocks */
 214         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
 215         CLKDEV_CON_ID("umem_clk", &div4_clks[DIV4_U]),
 216         CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
 217         CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
 218         CLKDEV_CON_ID("b3_clk", &div4_clks[DIV4_B3]),
 219         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 220         CLKDEV_CON_ID("irda_clk", &div4_enable_clks[DIV4_IRDA]),
 221         CLKDEV_CON_ID("siua_clk", &div4_reparent_clks[DIV4_SIUA]),
 222         CLKDEV_CON_ID("siub_clk", &div4_reparent_clks[DIV4_SIUB]),
 223
 224         /* DIV6 clocks */
 225         CLKDEV_CON_ID("video_clk", &div6_clks[DIV6_V]),
 226
 227         /* MSTP clocks */
 228         CLKDEV_CON_ID("tlb0", &mstp_clks[HWBLK_TLB]),
 229         CLKDEV_CON_ID("ic0", &mstp_clks[HWBLK_IC]),
 230         CLKDEV_CON_ID("oc0", &mstp_clks[HWBLK_OC]),
 231         CLKDEV_CON_ID("l2c0", &mstp_clks[HWBLK_L2C]),
 232         CLKDEV_CON_ID("ilmem0", &mstp_clks[HWBLK_ILMEM]),
 233         CLKDEV_CON_ID("fpu0", &mstp_clks[HWBLK_FPU]),
 234         CLKDEV_CON_ID("intc0", &mstp_clks[HWBLK_INTC]),
 235         CLKDEV_DEV_ID("sh-dma-engine.0", &mstp_clks[HWBLK_DMAC0]),
 236         CLKDEV_CON_ID("sh0", &mstp_clks[HWBLK_SHYWAY]),
 237         CLKDEV_CON_ID("hudi0", &mstp_clks[HWBLK_HUDI]),
 238         CLKDEV_CON_ID("ubc0", &mstp_clks[HWBLK_UBC]),
 239         CLKDEV_ICK_ID("fck", "sh-cmt-32.0", &mstp_clks[HWBLK_CMT]),
 240         CLKDEV_DEV_ID("sh-wdt.0", &mstp_clks[HWBLK_RWDT]),
 241         CLKDEV_DEV_ID("sh-dma-engine.1", &mstp_clks[HWBLK_DMAC1]),
 242         CLKDEV_CON_ID("flctl0", &mstp_clks[HWBLK_FLCTL]),
 243         CLKDEV_DEV_ID("spi_sh_msiof.0", &mstp_clks[HWBLK_MSIOF0]),
 244         CLKDEV_DEV_ID("spi_sh_msiof.1", &mstp_clks[HWBLK_MSIOF1]),
 245         CLKDEV_DEV_ID("sh_mobile_meram.0", &mstp_clks[HWBLK_MERAM]),
 246         CLKDEV_DEV_ID("i2c-sh_mobile.0", &mstp_clks[HWBLK_IIC]),
 247         CLKDEV_CON_ID("rtc0", &mstp_clks[HWBLK_RTC]),
 248         CLKDEV_CON_ID("atapi0", &mstp_clks[HWBLK_ATAPI]),
 249         CLKDEV_CON_ID("adc0", &mstp_clks[HWBLK_ADC]),
 250         CLKDEV_CON_ID("tpu0", &mstp_clks[HWBLK_TPU]),
 251         CLKDEV_CON_ID("irda0", &mstp_clks[HWBLK_IRDA]),
 252         CLKDEV_CON_ID("tsif0", &mstp_clks[HWBLK_TSIF]),
 253         CLKDEV_CON_ID("icb0", &mstp_clks[HWBLK_ICB]),
 254         CLKDEV_DEV_ID("sh_mobile_sdhi.0", &mstp_clks[HWBLK_SDHI0]),
 255         CLKDEV_DEV_ID("sh_mobile_sdhi.1", &mstp_clks[HWBLK_SDHI1]),
 256         CLKDEV_DEV_ID("sh_keysc.0", &mstp_clks[HWBLK_KEYSC]),
 257         CLKDEV_CON_ID("usb0", &mstp_clks[HWBLK_USB]),
 258         CLKDEV_CON_ID("2dg0", &mstp_clks[HWBLK_2DG]),
 259         CLKDEV_DEV_ID("siu-pcm-audio", &mstp_clks[HWBLK_SIU]),
 260         CLKDEV_CON_ID("veu1", &mstp_clks[HWBLK_VEU2H1]),
 261         CLKDEV_DEV_ID("sh-vou.0", &mstp_clks[HWBLK_VOU]),
 262         CLKDEV_CON_ID("beu0", &mstp_clks[HWBLK_BEU]),
 263         CLKDEV_DEV_ID("sh_mobile_ceu.0", &mstp_clks[HWBLK_CEU]),
 264         CLKDEV_CON_ID("veu0", &mstp_clks[HWBLK_VEU2H0]),
 265         CLKDEV_CON_ID("vpu0", &mstp_clks[HWBLK_VPU]),
 266
 267         CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[HWBLK_TMU0]),
 268         CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[HWBLK_TMU1]),
 269
 270         CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[HWBLK_SCIF0]),
 271         CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[HWBLK_SCIF1]),
 272         CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[HWBLK_SCIF2]),
 273         CLKDEV_ICK_ID("fck", "sh-sci.3", &mstp_clks[HWBLK_SCIF3]),
 274         CLKDEV_ICK_ID("fck", "sh-sci.4", &mstp_clks[HWBLK_SCIF4]),
 275         CLKDEV_ICK_ID("fck", "sh-sci.5", &mstp_clks[HWBLK_SCIF5]),
 276
 277         CLKDEV_DEV_ID("sh_mobile_lcdc_fb.0", &mstp_clks[HWBLK_LCDC]),
 278 };
 279
 280 int __init arch_clk_init(void)
 281 {
 282         int k, ret = 0;
 283
 284         /* autodetect extal or dll configuration */
 285         if (__raw_readl(PLLCR) & 0x1000)
 286                 pll_clk.parent = &dll_clk;
 287         else
 288                 pll_clk.parent = &extal_clk;
 289
 290         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 291                 ret |= clk_register(main_clks[k]);
 292
 293         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 294
 295         if (!ret)
 296                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 297
 298         if (!ret)
 299                 ret = sh_clk_div4_enable_register(div4_enable_clks,
 300                                         DIV4_ENABLE_NR, &div4_table);
 301
 302         if (!ret)
 303                 ret = sh_clk_div4_reparent_register(div4_reparent_clks,
 304                                         DIV4_REPARENT_NR, &div4_table);
 305
 306         if (!ret)
 307                 ret = sh_clk_div6_register(div6_clks, DIV6_NR);
 308
 309         if (!ret)
 310                 ret = sh_clk_mstp_register(mstp_clks, HWBLK_NR);
 311
 312         return ret;
 313 }