arch/arm/mach-shmobile/clock-sh73a0.c

   1 /*
   2  * sh73a0 clock framework support
   3  *
   4  * Copyright (C) 2010 Magnus Damm
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/io.h>
  22 #include <linux/sh_clk.h>
  23 #include <linux/clkdev.h>
  24 #include <mach/common.h>
  25
  26 #define FRQCRA          0xe6150000
  27 #define FRQCRB          0xe6150004
  28 #define FRQCRD          0xe61500e4
  29 #define VCLKCR1         0xe6150008
  30 #define VCLKCR2         0xe615000C
  31 #define VCLKCR3         0xe615001C
  32 #define ZBCKCR          0xe6150010
  33 #define FLCKCR          0xe6150014
  34 #define SD0CKCR         0xe6150074
  35 #define SD1CKCR         0xe6150078
  36 #define SD2CKCR         0xe615007C
  37 #define FSIACKCR        0xe6150018
  38 #define FSIBCKCR        0xe6150090
  39 #define SUBCKCR         0xe6150080
  40 #define SPUACKCR        0xe6150084
  41 #define SPUVCKCR        0xe6150094
  42 #define MSUCKCR         0xe6150088
  43 #define HSICKCR         0xe615008C
  44 #define MFCK1CR         0xe6150098
  45 #define MFCK2CR         0xe615009C
  46 #define DSITCKCR        0xe6150060
  47 #define DSI0PCKCR       0xe6150064
  48 #define DSI1PCKCR       0xe6150068
  49 #define DSI0PHYCR       0xe615006C
  50 #define DSI1PHYCR       0xe6150070
  51 #define PLLECR          0xe61500d0
  52 #define PLL0CR          0xe61500d8
  53 #define PLL1CR          0xe6150028
  54 #define PLL2CR          0xe615002c
  55 #define PLL3CR          0xe61500dc
  56 #define SMSTPCR0        0xe6150130
  57 #define SMSTPCR1        0xe6150134
  58 #define SMSTPCR2        0xe6150138
  59 #define SMSTPCR3        0xe615013c
  60 #define SMSTPCR4        0xe6150140
  61 #define SMSTPCR5        0xe6150144
  62 #define CKSCR           0xe61500c0
  63
  64 /* Fixed 32 KHz root clock from EXTALR pin */
  65 static struct clk r_clk = {
  66         .rate           = 32768,
  67 };
  68
  69 /*
  70  * 26MHz default rate for the EXTAL1 root input clock.
  71  * If needed, reset this with clk_set_rate() from the platform code.
  72  */
  73 struct clk sh73a0_extal1_clk = {
  74         .rate           = 26000000,
  75 };
  76
  77 /*
  78  * 48MHz default rate for the EXTAL2 root input clock.
  79  * If needed, reset this with clk_set_rate() from the platform code.
  80  */
  81 struct clk sh73a0_extal2_clk = {
  82         .rate           = 48000000,
  83 };
  84
  85 /* A fixed divide-by-2 block */
  86 static unsigned long div2_recalc(struct clk *clk)
  87 {
  88         return clk->parent->rate / 2;
  89 }
  90
  91 static struct clk_ops div2_clk_ops = {
  92         .recalc         = div2_recalc,
  93 };
  94
  95 /* Divide extal1 by two */
  96 static struct clk extal1_div2_clk = {
  97         .ops            = &div2_clk_ops,
  98         .parent         = &sh73a0_extal1_clk,
  99 };
 100
 101 /* Divide extal2 by two */
 102 static struct clk extal2_div2_clk = {
 103         .ops            = &div2_clk_ops,
 104         .parent         = &sh73a0_extal2_clk,
 105 };
 106
 107 static struct clk_ops main_clk_ops = {
 108         .recalc         = followparent_recalc,
 109 };
 110
 111 /* Main clock */
 112 static struct clk main_clk = {
 113         .ops            = &main_clk_ops,
 114 };
 115
 116 /* PLL0, PLL1, PLL2, PLL3 */
 117 static unsigned long pll_recalc(struct clk *clk)
 118 {
 119         unsigned long mult = 1;
 120
 121         if (__raw_readl(PLLECR) & (1 << clk->enable_bit)) {
 122                 mult = (((__raw_readl(clk->enable_reg) >> 24) & 0x3f) + 1);
 123                 /* handle CFG bit for PLL1 and PLL2 */
 124                 switch (clk->enable_bit) {
 125                 case 1:
 126                 case 2:
 127                         if (__raw_readl(clk->enable_reg) & (1 << 20))
 128                                 mult *= 2;
 129                 }
 130         }
 131
 132         return clk->parent->rate * mult;
 133 }
 134
 135 static struct clk_ops pll_clk_ops = {
 136         .recalc         = pll_recalc,
 137 };
 138
 139 static struct clk pll0_clk = {
 140         .ops            = &pll_clk_ops,
 141         .flags          = CLK_ENABLE_ON_INIT,
 142         .parent         = &main_clk,
 143         .enable_reg     = (void __iomem *)PLL0CR,
 144         .enable_bit     = 0,
 145 };
 146
 147 static struct clk pll1_clk = {
 148         .ops            = &pll_clk_ops,
 149         .flags          = CLK_ENABLE_ON_INIT,
 150         .parent         = &main_clk,
 151         .enable_reg     = (void __iomem *)PLL1CR,
 152         .enable_bit     = 1,
 153 };
 154
 155 static struct clk pll2_clk = {
 156         .ops            = &pll_clk_ops,
 157         .flags          = CLK_ENABLE_ON_INIT,
 158         .parent         = &main_clk,
 159         .enable_reg     = (void __iomem *)PLL2CR,
 160         .enable_bit     = 2,
 161 };
 162
 163 static struct clk pll3_clk = {
 164         .ops            = &pll_clk_ops,
 165         .flags          = CLK_ENABLE_ON_INIT,
 166         .parent         = &main_clk,
 167         .enable_reg     = (void __iomem *)PLL3CR,
 168         .enable_bit     = 3,
 169 };
 170
 171 /* Divide PLL1 by two */
 172 static struct clk pll1_div2_clk = {
 173         .ops            = &div2_clk_ops,
 174         .parent         = &pll1_clk,
 175 };
 176
 177 static struct clk *main_clks[] = {
 178         &r_clk,
 179         &sh73a0_extal1_clk,
 180         &sh73a0_extal2_clk,
 181         &extal1_div2_clk,
 182         &extal2_div2_clk,
 183         &main_clk,
 184         &pll0_clk,
 185         &pll1_clk,
 186         &pll2_clk,
 187         &pll3_clk,
 188         &pll1_div2_clk,
 189 };
 190
 191 static void div4_kick(struct clk *clk)
 192 {
 193         unsigned long value;
 194
 195         /* set KICK bit in FRQCRB to update hardware setting */
 196         value = __raw_readl(FRQCRB);
 197         value |= (1 << 31);
 198         __raw_writel(value, FRQCRB);
 199 }
 200
 201 static int divisors[] = { 2, 3, 4, 6, 8, 12, 16, 18,
 202                           24, 0, 36, 48, 7 };
 203
 204 static struct clk_div_mult_table div4_div_mult_table = {
 205         .divisors = divisors,
 206         .nr_divisors = ARRAY_SIZE(divisors),
 207 };
 208
 209 static struct clk_div4_table div4_table = {
 210         .div_mult_table = &div4_div_mult_table,
 211         .kick = div4_kick,
 212 };
 213
 214 enum { DIV4_I, DIV4_ZG, DIV4_M3, DIV4_B, DIV4_M1, DIV4_M2,
 215         DIV4_Z, DIV4_ZTR, DIV4_ZT, DIV4_ZX, DIV4_HP, DIV4_NR };
 216
 217 #define DIV4(_reg, _bit, _mask, _flags) \
 218         SH_CLK_DIV4(&pll1_clk, _reg, _bit, _mask, _flags)
 219
 220 static struct clk div4_clks[DIV4_NR] = {
 221         [DIV4_I] = DIV4(FRQCRA, 20, 0xfff, CLK_ENABLE_ON_INIT),
 222         [DIV4_ZG] = DIV4(FRQCRA, 16, 0xbff, CLK_ENABLE_ON_INIT),
 223         [DIV4_M3] = DIV4(FRQCRA, 12, 0xfff, CLK_ENABLE_ON_INIT),
 224         [DIV4_B] = DIV4(FRQCRA, 8, 0xfff, CLK_ENABLE_ON_INIT),
 225         [DIV4_M1] = DIV4(FRQCRA, 4, 0xfff, 0),
 226         [DIV4_M2] = DIV4(FRQCRA, 0, 0xfff, 0),
 227         [DIV4_Z] = DIV4(FRQCRB, 24, 0xbff, 0),
 228         [DIV4_ZTR] = DIV4(FRQCRB, 20, 0xfff, 0),
 229         [DIV4_ZT] = DIV4(FRQCRB, 16, 0xfff, 0),
 230         [DIV4_ZX] = DIV4(FRQCRB, 12, 0xfff, 0),
 231         [DIV4_HP] = DIV4(FRQCRB, 4, 0xfff, 0),
 232 };
 233
 234 enum { DIV6_VCK1, DIV6_VCK2, DIV6_VCK3, DIV6_ZB1,
 235         DIV6_FLCTL, DIV6_SDHI0, DIV6_SDHI1, DIV6_SDHI2,
 236         DIV6_FSIA, DIV6_FSIB, DIV6_SUB,
 237         DIV6_SPUA, DIV6_SPUV, DIV6_MSU,
 238         DIV6_HSI,  DIV6_MFG1, DIV6_MFG2,
 239         DIV6_DSIT, DIV6_DSI0P, DIV6_DSI1P,
 240         DIV6_NR };
 241
 242 static struct clk div6_clks[DIV6_NR] = {
 243         [DIV6_VCK1] = SH_CLK_DIV6(&pll1_div2_clk, VCLKCR1, 0),
 244         [DIV6_VCK2] = SH_CLK_DIV6(&pll1_div2_clk, VCLKCR2, 0),
 245         [DIV6_VCK3] = SH_CLK_DIV6(&pll1_div2_clk, VCLKCR3, 0),
 246         [DIV6_ZB1] = SH_CLK_DIV6(&pll1_div2_clk, ZBCKCR, 0),
 247         [DIV6_FLCTL] = SH_CLK_DIV6(&pll1_div2_clk, FLCKCR, 0),
 248         [DIV6_SDHI0] = SH_CLK_DIV6(&pll1_div2_clk, SD0CKCR, 0),
 249         [DIV6_SDHI1] = SH_CLK_DIV6(&pll1_div2_clk, SD1CKCR, 0),
 250         [DIV6_SDHI2] = SH_CLK_DIV6(&pll1_div2_clk, SD2CKCR, 0),
 251         [DIV6_FSIA] = SH_CLK_DIV6(&pll1_div2_clk, FSIACKCR, 0),
 252         [DIV6_FSIB] = SH_CLK_DIV6(&pll1_div2_clk, FSIBCKCR, 0),
 253         [DIV6_SUB] = SH_CLK_DIV6(&sh73a0_extal2_clk, SUBCKCR, 0),
 254         [DIV6_SPUA] = SH_CLK_DIV6(&pll1_div2_clk, SPUACKCR, 0),
 255         [DIV6_SPUV] = SH_CLK_DIV6(&pll1_div2_clk, SPUVCKCR, 0),
 256         [DIV6_MSU] = SH_CLK_DIV6(&pll1_div2_clk, MSUCKCR, 0),
 257         [DIV6_HSI] = SH_CLK_DIV6(&pll1_div2_clk, HSICKCR, 0),
 258         [DIV6_MFG1] = SH_CLK_DIV6(&pll1_div2_clk, MFCK1CR, 0),
 259         [DIV6_MFG2] = SH_CLK_DIV6(&pll1_div2_clk, MFCK2CR, 0),
 260         [DIV6_DSIT] = SH_CLK_DIV6(&pll1_div2_clk, DSITCKCR, 0),
 261         [DIV6_DSI0P] = SH_CLK_DIV6(&pll1_div2_clk, DSI0PCKCR, 0),
 262         [DIV6_DSI1P] = SH_CLK_DIV6(&pll1_div2_clk, DSI1PCKCR, 0),
 263 };
 264
 265 enum { MSTP001,
 266         MSTP129, MSTP128, MSTP127, MSTP126, MSTP125, MSTP118, MSTP116, MSTP100,
 267         MSTP219,
 268         MSTP207, MSTP206, MSTP204, MSTP203, MSTP202, MSTP201, MSTP200,
 269         MSTP331, MSTP329, MSTP325, MSTP323, MSTP318,
 270         MSTP314, MSTP313, MSTP312, MSTP311,
 271         MSTP411, MSTP410, MSTP403,
 272         MSTP_NR };
 273
 274 #define MSTP(_parent, _reg, _bit, _flags) \
 275         SH_CLK_MSTP32(_parent, _reg, _bit, _flags)
 276
 277 static struct clk mstp_clks[MSTP_NR] = {
 278         [MSTP001] = MSTP(&div4_clks[DIV4_HP], SMSTPCR0, 1, 0), /* IIC2 */
 279         [MSTP129] = MSTP(&div4_clks[DIV4_B], SMSTPCR1, 29, 0), /* CEU1 */
 280         [MSTP128] = MSTP(&div4_clks[DIV4_B], SMSTPCR1, 28, 0), /* CSI2-RX1 */
 281         [MSTP127] = MSTP(&div4_clks[DIV4_B], SMSTPCR1, 27, 0), /* CEU0 */
 282         [MSTP126] = MSTP(&div4_clks[DIV4_B], SMSTPCR1, 26, 0), /* CSI2-RX0 */
 283         [MSTP125] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR1, 25, 0), /* TMU0 */
 284         [MSTP118] = MSTP(&div4_clks[DIV4_B], SMSTPCR1, 18, 0), /* DSITX0 */
 285         [MSTP116] = MSTP(&div4_clks[DIV4_HP], SMSTPCR1, 16, 0), /* IIC0 */
 286         [MSTP100] = MSTP(&div4_clks[DIV4_B], SMSTPCR1, 0, 0), /* LCDC0 */
 287         [MSTP219] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR2, 19, 0), /* SCIFA7 */
 288         [MSTP207] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR2, 7, 0), /* SCIFA5 */
 289         [MSTP206] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR2, 6, 0), /* SCIFB */
 290         [MSTP204] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR2, 4, 0), /* SCIFA0 */
 291         [MSTP203] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR2, 3, 0), /* SCIFA1 */
 292         [MSTP202] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR2, 2, 0), /* SCIFA2 */
 293         [MSTP201] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR2, 1, 0), /* SCIFA3 */
 294         [MSTP200] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR2, 0, 0), /* SCIFA4 */
 295         [MSTP331] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR3, 31, 0), /* SCIFA6 */
 296         [MSTP329] = MSTP(&r_clk, SMSTPCR3, 29, 0), /* CMT10 */
 297         [MSTP325] = MSTP(&div6_clks[DIV6_SUB], SMSTPCR3, 25, 0), /* IrDA */
 298         [MSTP323] = MSTP(&div4_clks[DIV4_HP], SMSTPCR3, 23, 0), /* IIC1 */
 299         [MSTP318] = MSTP(&div4_clks[DIV4_HP], SMSTPCR3, 18, 0), /* SY-DMAC */
 300         [MSTP314] = MSTP(&div6_clks[DIV6_SDHI0], SMSTPCR3, 14, 0), /* SDHI0 */
 301         [MSTP313] = MSTP(&div6_clks[DIV6_SDHI1], SMSTPCR3, 13, 0), /* SDHI1 */
 302         [MSTP312] = MSTP(&div4_clks[DIV4_HP], SMSTPCR3, 12, 0), /* MMCIF0 */
 303         [MSTP311] = MSTP(&div6_clks[DIV6_SDHI2], SMSTPCR3, 11, 0), /* SDHI2 */
 304         [MSTP411] = MSTP(&div4_clks[DIV4_HP], SMSTPCR4, 11, 0), /* IIC3 */
 305         [MSTP410] = MSTP(&div4_clks[DIV4_HP], SMSTPCR4, 10, 0), /* IIC4 */
 306         [MSTP403] = MSTP(&r_clk, SMSTPCR4, 3, 0), /* KEYSC */
 307 };
 308
 309 static struct clk_lookup lookups[] = {
 310         /* main clocks */
 311         CLKDEV_CON_ID("r_clk", &r_clk),
 312
 313         /* DIV6 clocks */
 314         CLKDEV_CON_ID("vck1_clk", &div6_clks[DIV6_VCK1]),
 315         CLKDEV_CON_ID("vck2_clk", &div6_clks[DIV6_VCK2]),
 316         CLKDEV_CON_ID("vck3_clk", &div6_clks[DIV6_VCK3]),
 317         CLKDEV_CON_ID("sdhi0_clk", &div6_clks[DIV6_SDHI0]),
 318         CLKDEV_CON_ID("sdhi1_clk", &div6_clks[DIV6_SDHI1]),
 319         CLKDEV_CON_ID("sdhi2_clk", &div6_clks[DIV6_SDHI2]),
 320         CLKDEV_ICK_ID("dsit_clk", "sh-mipi-dsi.0", &div6_clks[DIV6_DSIT]),
 321         CLKDEV_ICK_ID("dsit_clk", "sh-mipi-dsi.1", &div6_clks[DIV6_DSIT]),
 322         CLKDEV_ICK_ID("dsi0p_clk", "sh-mipi-dsi.0", &div6_clks[DIV6_DSI0P]),
 323         CLKDEV_ICK_ID("dsi1p_clk", "sh-mipi-dsi.1", &div6_clks[DIV6_DSI1P]),
 324
 325         /* MSTP32 clocks */
 326         CLKDEV_DEV_ID("i2c-sh_mobile.2", &mstp_clks[MSTP001]), /* I2C2 */
 327         CLKDEV_DEV_ID("sh_mobile_ceu.1", &mstp_clks[MSTP129]), /* CEU1 */
 328         CLKDEV_DEV_ID("sh-mobile-csi2.1", &mstp_clks[MSTP128]), /* CSI2-RX1 */
 329         CLKDEV_DEV_ID("sh_mobile_ceu.0", &mstp_clks[MSTP127]), /* CEU0 */
 330         CLKDEV_DEV_ID("sh-mobile-csi2.0", &mstp_clks[MSTP126]), /* CSI2-RX0 */
 331         CLKDEV_DEV_ID("sh_tmu.0", &mstp_clks[MSTP125]), /* TMU00 */
 332         CLKDEV_DEV_ID("sh_tmu.1", &mstp_clks[MSTP125]), /* TMU01 */
 333         CLKDEV_DEV_ID("sh-mipi-dsi.0", &mstp_clks[MSTP118]), /* DSITX */
 334         CLKDEV_DEV_ID("i2c-sh_mobile.0", &mstp_clks[MSTP116]), /* I2C0 */
 335         CLKDEV_DEV_ID("sh_mobile_lcdc_fb.0", &mstp_clks[MSTP100]), /* LCDC0 */
 336         CLKDEV_DEV_ID("sh-sci.7", &mstp_clks[MSTP219]), /* SCIFA7 */
 337         CLKDEV_DEV_ID("sh-sci.5", &mstp_clks[MSTP207]), /* SCIFA5 */
 338         CLKDEV_DEV_ID("sh-sci.8", &mstp_clks[MSTP206]), /* SCIFB */
 339         CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[MSTP204]), /* SCIFA0 */
 340         CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[MSTP203]), /* SCIFA1 */
 341         CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[MSTP202]), /* SCIFA2 */
 342         CLKDEV_DEV_ID("sh-sci.3", &mstp_clks[MSTP201]), /* SCIFA3 */
 343         CLKDEV_DEV_ID("sh-sci.4", &mstp_clks[MSTP200]), /* SCIFA4 */
 344         CLKDEV_DEV_ID("sh-sci.6", &mstp_clks[MSTP331]), /* SCIFA6 */
 345         CLKDEV_DEV_ID("sh_cmt.10", &mstp_clks[MSTP329]), /* CMT10 */
 346         CLKDEV_DEV_ID("sh_irda.0", &mstp_clks[MSTP325]), /* IrDA */
 347         CLKDEV_DEV_ID("i2c-sh_mobile.1", &mstp_clks[MSTP323]), /* I2C1 */
 348         CLKDEV_DEV_ID("sh-dma-engine.0", &mstp_clks[MSTP318]), /* SY-DMAC */
 349         CLKDEV_DEV_ID("sh_mobile_sdhi.0", &mstp_clks[MSTP314]), /* SDHI0 */
 350         CLKDEV_DEV_ID("sh_mobile_sdhi.1", &mstp_clks[MSTP313]), /* SDHI1 */
 351         CLKDEV_DEV_ID("sh_mmcif.0", &mstp_clks[MSTP312]), /* MMCIF0 */
 352         CLKDEV_DEV_ID("sh_mobile_sdhi.2", &mstp_clks[MSTP311]), /* SDHI2 */
 353         CLKDEV_DEV_ID("i2c-sh_mobile.3", &mstp_clks[MSTP411]), /* I2C3 */
 354         CLKDEV_DEV_ID("i2c-sh_mobile.4", &mstp_clks[MSTP410]), /* I2C4 */
 355         CLKDEV_DEV_ID("sh_keysc.0", &mstp_clks[MSTP403]), /* KEYSC */
 356 };
 357
 358 void __init sh73a0_clock_init(void)
 359 {
 360         int k, ret = 0;
 361
 362         /* Set SDHI clocks to a known state */
 363         __raw_writel(0x108, SD0CKCR);
 364         __raw_writel(0x108, SD1CKCR);
 365         __raw_writel(0x108, SD2CKCR);
 366
 367         /* detect main clock parent */
 368         switch ((__raw_readl(CKSCR) >> 24) & 0x03) {
 369         case 0:
 370                 main_clk.parent = &sh73a0_extal1_clk;
 371                 break;
 372         case 1:
 373                 main_clk.parent = &extal1_div2_clk;
 374                 break;
 375         case 2:
 376                 main_clk.parent = &sh73a0_extal2_clk;
 377                 break;
 378         case 3:
 379                 main_clk.parent = &extal2_div2_clk;
 380                 break;
 381         }
 382
 383         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 384                 ret = clk_register(main_clks[k]);
 385
 386         if (!ret)
 387                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 388
 389         if (!ret)
 390                 ret = sh_clk_div6_register(div6_clks, DIV6_NR);
 391
 392         if (!ret)
 393                 ret = sh_clk_mstp32_register(mstp_clks, MSTP_NR);
 394
 395         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 396
 397         if (!ret)
 398                 clk_init();
 399         else
 400                 panic("failed to setup sh73a0 clocks\n");
 401 }