kernel/arch/sh/kernel/cpu/sh4a/clock-sh7722.c

   1 /*
   2  * arch/sh/kernel/cpu/sh4a/clock-sh7722.c
   3  *
   4  * SH7722 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/clkdev.h>
  25 #include <linux/sh_clk.h>
  26 #include <asm/clock.h>
  27 #include <cpu/sh7722.h>
  28
  29 /* SH7722 registers */
  30 #define FRQCR           0xa4150000
  31 #define VCLKCR          0xa4150004
  32 #define SCLKACR         0xa4150008
  33 #define SCLKBCR         0xa415000c
  34 #define IRDACLKCR       0xa4150018
  35 #define PLLCR           0xa4150024
  36 #define MSTPCR0         0xa4150030
  37 #define MSTPCR1         0xa4150034
  38 #define MSTPCR2         0xa4150038
  39 #define DLLFRQ          0xa4150050
  40
  41 /* Fixed 32 KHz root clock for RTC and Power Management purposes */
  42 static struct clk r_clk = {
  43         .rate           = 32768,
  44 };
  45
  46 /*
  47  * Default rate for the root input clock, reset this with clk_set_rate()
  48  * from the platform code.
  49  */
  50 struct clk extal_clk = {
  51         .rate           = 33333333,
  52 };
  53
  54 /* The dll block multiplies the 32khz r_clk, may be used instead of extal */
  55 static unsigned long dll_recalc(struct clk *clk)
  56 {
  57         unsigned long mult;
  58
  59         if (__raw_readl(PLLCR) & 0x1000)
  60                 mult = __raw_readl(DLLFRQ);
  61         else
  62                 mult = 0;
  63
  64         return clk->parent->rate * mult;
  65 }
  66
  67 static struct sh_clk_ops dll_clk_ops = {
  68         .recalc         = dll_recalc,
  69 };
  70
  71 static struct clk dll_clk = {
  72         .ops            = &dll_clk_ops,
  73         .parent         = &r_clk,
  74         .flags          = CLK_ENABLE_ON_INIT,
  75 };
  76
  77 static unsigned long pll_recalc(struct clk *clk)
  78 {
  79         unsigned long mult = 1;
  80         unsigned long div = 1;
  81
  82         if (__raw_readl(PLLCR) & 0x4000)
  83                 mult = (((__raw_readl(FRQCR) >> 24) & 0x1f) + 1);
  84         else
  85                 div = 2;
  86
  87         return (clk->parent->rate * mult) / div;
  88 }
  89
  90 static struct sh_clk_ops pll_clk_ops = {
  91         .recalc         = pll_recalc,
  92 };
  93
  94 static struct clk pll_clk = {
  95         .ops            = &pll_clk_ops,
  96         .flags          = CLK_ENABLE_ON_INIT,
  97 };
  98
  99 struct clk *main_clks[] = {
 100         &r_clk,
 101         &extal_clk,
 102         &dll_clk,
 103         &pll_clk,
 104 };
 105
 106 static int multipliers[] = { 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
 107 static int divisors[] = { 1, 3, 2, 5, 3, 4, 5, 6, 8, 10, 12, 16, 20 };
 108
 109 static struct clk_div_mult_table div4_div_mult_table = {
 110         .divisors = divisors,
 111         .nr_divisors = ARRAY_SIZE(divisors),
 112         .multipliers = multipliers,
 113         .nr_multipliers = ARRAY_SIZE(multipliers),
 114 };
 115
 116 static struct clk_div4_table div4_table = {
 117         .div_mult_table = &div4_div_mult_table,
 118 };
 119
 120 #define DIV4(_reg, _bit, _mask, _flags) \
 121   SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
 122
 123 enum { DIV4_I, DIV4_U, DIV4_SH, DIV4_B, DIV4_B3, DIV4_P, DIV4_NR };
 124
 125 struct clk div4_clks[DIV4_NR] = {
 126         [DIV4_I] = DIV4(FRQCR, 20, 0x1fef, CLK_ENABLE_ON_INIT),
 127         [DIV4_U] = DIV4(FRQCR, 16, 0x1fff, CLK_ENABLE_ON_INIT),
 128         [DIV4_SH] = DIV4(FRQCR, 12, 0x1fff, CLK_ENABLE_ON_INIT),
 129         [DIV4_B] = DIV4(FRQCR, 8, 0x1fff, CLK_ENABLE_ON_INIT),
 130         [DIV4_B3] = DIV4(FRQCR, 4, 0x1fff, CLK_ENABLE_ON_INIT),
 131         [DIV4_P] = DIV4(FRQCR, 0, 0x1fff, 0),
 132 };
 133
 134 enum { DIV4_IRDA, DIV4_ENABLE_NR };
 135
 136 struct clk div4_enable_clks[DIV4_ENABLE_NR] = {
 137         [DIV4_IRDA] = DIV4(IRDACLKCR, 0, 0x1fff, 0),
 138 };
 139
 140 enum { DIV4_SIUA, DIV4_SIUB, DIV4_REPARENT_NR };
 141
 142 struct clk div4_reparent_clks[DIV4_REPARENT_NR] = {
 143         [DIV4_SIUA] = DIV4(SCLKACR, 0, 0x1fff, 0),
 144         [DIV4_SIUB] = DIV4(SCLKBCR, 0, 0x1fff, 0),
 145 };
 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[HWBLK_NR] = {
 154         [HWBLK_URAM]  = SH_CLK_MSTP32(&div4_clks[DIV4_U], MSTPCR0, 28, CLK_ENABLE_ON_INIT),
 155         [HWBLK_XYMEM] = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR0, 26, CLK_ENABLE_ON_INIT),
 156         [HWBLK_TMU]   = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 15, 0),
 157         [HWBLK_CMT]   = SH_CLK_MSTP32(&r_clk,             MSTPCR0, 14, 0),
 158         [HWBLK_RWDT]  = SH_CLK_MSTP32(&r_clk,             MSTPCR0, 13, 0),
 159         [HWBLK_FLCTL] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 10, 0),
 160         [HWBLK_SCIF0] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 7, 0),
 161         [HWBLK_SCIF1] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 6, 0),
 162         [HWBLK_SCIF2] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 5, 0),
 163
 164         [HWBLK_IIC]   = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 9, 0),
 165         [HWBLK_RTC]   = SH_CLK_MSTP32(&r_clk,             MSTPCR1, 8, 0),
 166
 167         [HWBLK_SDHI]  = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR2, 18, 0),
 168         [HWBLK_KEYSC] = SH_CLK_MSTP32(&r_clk,             MSTPCR2, 14, 0),
 169         [HWBLK_USBF]  = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR2, 11, 0),
 170         [HWBLK_2DG]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 9, 0),
 171         [HWBLK_SIU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 8, 0),
 172         [HWBLK_JPU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 6, 0),
 173         [HWBLK_VOU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 5, 0),
 174         [HWBLK_BEU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 4, 0),
 175         [HWBLK_CEU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 3, 0),
 176         [HWBLK_VEU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 2, 0),
 177         [HWBLK_VPU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 1, 0),
 178         [HWBLK_LCDC]  = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR2, 0, 0),
 179 };
 180
 181 static struct clk_lookup lookups[] = {
 182         /* main clocks */
 183         CLKDEV_CON_ID("rclk", &r_clk),
 184         CLKDEV_CON_ID("extal", &extal_clk),
 185         CLKDEV_CON_ID("dll_clk", &dll_clk),
 186         CLKDEV_CON_ID("pll_clk", &pll_clk),
 187
 188         /* DIV4 clocks */
 189         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
 190         CLKDEV_CON_ID("umem_clk", &div4_clks[DIV4_U]),
 191         CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
 192         CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
 193         CLKDEV_CON_ID("b3_clk", &div4_clks[DIV4_B3]),
 194         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 195         CLKDEV_CON_ID("irda_clk", &div4_enable_clks[DIV4_IRDA]),
 196         CLKDEV_CON_ID("siua_clk", &div4_reparent_clks[DIV4_SIUA]),
 197         CLKDEV_CON_ID("siub_clk", &div4_reparent_clks[DIV4_SIUB]),
 198
 199         /* DIV6 clocks */
 200         CLKDEV_CON_ID("video_clk", &div6_clks[DIV6_V]),
 201
 202         /* MSTP clocks */
 203         CLKDEV_CON_ID("uram0", &mstp_clks[HWBLK_URAM]),
 204         CLKDEV_CON_ID("xymem0", &mstp_clks[HWBLK_XYMEM]),
 205
 206         CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[HWBLK_TMU]),
 207
 208         CLKDEV_ICK_ID("fck", "sh-cmt-32.0", &mstp_clks[HWBLK_CMT]),
 209         CLKDEV_DEV_ID("sh-wdt.0", &mstp_clks[HWBLK_RWDT]),
 210         CLKDEV_CON_ID("flctl0", &mstp_clks[HWBLK_FLCTL]),
 211
 212         CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[HWBLK_SCIF0]),
 213         CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[HWBLK_SCIF1]),
 214         CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[HWBLK_SCIF2]),
 215
 216         CLKDEV_DEV_ID("i2c-sh_mobile.0", &mstp_clks[HWBLK_IIC]),
 217         CLKDEV_CON_ID("rtc0", &mstp_clks[HWBLK_RTC]),
 218         CLKDEV_DEV_ID("sh_mobile_sdhi.0", &mstp_clks[HWBLK_SDHI]),
 219         CLKDEV_DEV_ID("sh_keysc.0", &mstp_clks[HWBLK_KEYSC]),
 220         CLKDEV_CON_ID("usbf0", &mstp_clks[HWBLK_USBF]),
 221         CLKDEV_CON_ID("2dg0", &mstp_clks[HWBLK_2DG]),
 222         CLKDEV_DEV_ID("siu-pcm-audio", &mstp_clks[HWBLK_SIU]),
 223         CLKDEV_DEV_ID("sh-vou.0", &mstp_clks[HWBLK_VOU]),
 224         CLKDEV_CON_ID("jpu0", &mstp_clks[HWBLK_JPU]),
 225         CLKDEV_CON_ID("beu0", &mstp_clks[HWBLK_BEU]),
 226         CLKDEV_DEV_ID("sh_mobile_ceu.0", &mstp_clks[HWBLK_CEU]),
 227         CLKDEV_CON_ID("veu0", &mstp_clks[HWBLK_VEU]),
 228         CLKDEV_CON_ID("vpu0", &mstp_clks[HWBLK_VPU]),
 229         CLKDEV_DEV_ID("sh_mobile_lcdc_fb.0", &mstp_clks[HWBLK_LCDC]),
 230 };
 231
 232 int __init arch_clk_init(void)
 233 {
 234         int k, ret = 0;
 235
 236         /* autodetect extal or dll configuration */
 237         if (__raw_readl(PLLCR) & 0x1000)
 238                 pll_clk.parent = &dll_clk;
 239         else
 240                 pll_clk.parent = &extal_clk;
 241
 242         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 243                 ret = clk_register(main_clks[k]);
 244
 245         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 246
 247         if (!ret)
 248                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 249
 250         if (!ret)
 251                 ret = sh_clk_div4_enable_register(div4_enable_clks,
 252                                         DIV4_ENABLE_NR, &div4_table);
 253
 254         if (!ret)
 255                 ret = sh_clk_div4_reparent_register(div4_reparent_clks,
 256                                         DIV4_REPARENT_NR, &div4_table);
 257
 258         if (!ret)
 259                 ret = sh_clk_div6_register(div6_clks, DIV6_NR);
 260
 261         if (!ret)
 262                 ret = sh_clk_mstp_register(mstp_clks, HWBLK_NR);
 263
 264         return ret;
 265 }