arch/sh/kernel/cpu/sh4a/clock-sh7366.c

   1 /*
   2  * arch/sh/kernel/cpu/sh4a/clock-sh7366.c
   3  *
   4  * SH7366 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 <asm/clock.h>
  25
  26 /* SH7366 registers */
  27 #define FRQCR           0xa4150000
  28 #define VCLKCR          0xa4150004
  29 #define SCLKACR         0xa4150008
  30 #define SCLKBCR         0xa415000c
  31 #define PLLCR           0xa4150024
  32 #define MSTPCR0         0xa4150030
  33 #define MSTPCR1         0xa4150034
  34 #define MSTPCR2         0xa4150038
  35 #define DLLFRQ          0xa4150050
  36
  37 /* Fixed 32 KHz root clock for RTC and Power Management purposes */
  38 static struct clk r_clk = {
  39         .name           = "rclk",
  40         .id             = -1,
  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         .name           = "extal",
  50         .id             = -1,
  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 clk_ops dll_clk_ops = {
  68         .recalc         = dll_recalc,
  69 };
  70
  71 static struct clk dll_clk = {
  72         .name           = "dll_clk",
  73         .id             = -1,
  74         .ops            = &dll_clk_ops,
  75         .parent         = &r_clk,
  76         .flags          = CLK_ENABLE_ON_INIT,
  77 };
  78
  79 static unsigned long pll_recalc(struct clk *clk)
  80 {
  81         unsigned long mult = 1;
  82         unsigned long div = 1;
  83
  84         if (__raw_readl(PLLCR) & 0x4000)
  85                 mult = (((__raw_readl(FRQCR) >> 24) & 0x1f) + 1);
  86         else
  87                 div = 2;
  88
  89         return (clk->parent->rate * mult) / div;
  90 }
  91
  92 static struct clk_ops pll_clk_ops = {
  93         .recalc         = pll_recalc,
  94 };
  95
  96 static struct clk pll_clk = {
  97         .name           = "pll_clk",
  98         .id             = -1,
  99         .ops            = &pll_clk_ops,
 100         .flags          = CLK_ENABLE_ON_INIT,
 101 };
 102
 103 struct clk *main_clks[] = {
 104         &r_clk,
 105         &extal_clk,
 106         &dll_clk,
 107         &pll_clk,
 108 };
 109
 110 static int multipliers[] = { 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
 111 static int divisors[] = { 1, 3, 2, 5, 3, 4, 5, 6, 8, 10, 12, 16, 20 };
 112
 113 static struct clk_div_mult_table div4_table = {
 114         .divisors = divisors,
 115         .nr_divisors = ARRAY_SIZE(divisors),
 116         .multipliers = multipliers,
 117         .nr_multipliers = ARRAY_SIZE(multipliers),
 118 };
 119
 120 enum { DIV4_I, DIV4_U, DIV4_SH, DIV4_B, DIV4_B3, DIV4_P,
 121        DIV4_SIUA, DIV4_SIUB, DIV4_NR };
 122
 123 #define DIV4(_str, _reg, _bit, _mask, _flags) \
 124   SH_CLK_DIV4(_str, &pll_clk, _reg, _bit, _mask, _flags)
 125
 126 struct clk div4_clks[DIV4_NR] = {
 127         [DIV4_I] = DIV4("cpu_clk", FRQCR, 20, 0x1fef, CLK_ENABLE_ON_INIT),
 128         [DIV4_U] = DIV4("umem_clk", FRQCR, 16, 0x1fff, CLK_ENABLE_ON_INIT),
 129         [DIV4_SH] = DIV4("shyway_clk", FRQCR, 12, 0x1fff, CLK_ENABLE_ON_INIT),
 130         [DIV4_B] = DIV4("bus_clk", FRQCR, 8, 0x1fff, CLK_ENABLE_ON_INIT),
 131         [DIV4_B3] = DIV4("b3_clk", FRQCR, 4, 0x1fff, CLK_ENABLE_ON_INIT),
 132         [DIV4_P] = DIV4("peripheral_clk", FRQCR, 0, 0x1fff, 0),
 133         [DIV4_SIUA] = DIV4("siua_clk", SCLKACR, 0, 0x1fff, 0),
 134         [DIV4_SIUB] = DIV4("siub_clk", SCLKBCR, 0, 0x1fff, 0),
 135 };
 136
 137 struct clk div6_clks[] = {
 138         SH_CLK_DIV6("video_clk", &pll_clk, VCLKCR, 0),
 139 };
 140
 141 #define MSTP(_str, _parent, _reg, _bit, _flags) \
 142   SH_CLK_MSTP32(_str, -1, _parent, _reg, _bit, _flags)
 143
 144 static struct clk mstp_clks[] = {
 145         /* See page 52 of Datasheet V0.40: Overview -> Block Diagram */
 146         MSTP("tlb0", &div4_clks[DIV4_I], MSTPCR0, 31, CLK_ENABLE_ON_INIT),
 147         MSTP("ic0", &div4_clks[DIV4_I], MSTPCR0, 30, CLK_ENABLE_ON_INIT),
 148         MSTP("oc0", &div4_clks[DIV4_I], MSTPCR0, 29, CLK_ENABLE_ON_INIT),
 149         MSTP("rsmem0", &div4_clks[DIV4_SH], MSTPCR0, 28, CLK_ENABLE_ON_INIT),
 150         MSTP("xymem0", &div4_clks[DIV4_B], MSTPCR0, 26, CLK_ENABLE_ON_INIT),
 151         MSTP("intc3", &div4_clks[DIV4_P], MSTPCR0, 23, 0),
 152         MSTP("intc0", &div4_clks[DIV4_P], MSTPCR0, 22, 0),
 153         MSTP("dmac0", &div4_clks[DIV4_P], MSTPCR0, 21, 0),
 154         MSTP("sh0", &div4_clks[DIV4_P], MSTPCR0, 20, 0),
 155         MSTP("hudi0", &div4_clks[DIV4_P], MSTPCR0, 19, 0),
 156         MSTP("ubc0", &div4_clks[DIV4_P], MSTPCR0, 17, 0),
 157         MSTP("tmu0", &div4_clks[DIV4_P], MSTPCR0, 15, 0),
 158         MSTP("cmt0", &r_clk, MSTPCR0, 14, 0),
 159         MSTP("rwdt0", &r_clk, MSTPCR0, 13, 0),
 160         MSTP("mfi0", &div4_clks[DIV4_P], MSTPCR0, 11, 0),
 161         MSTP("flctl0", &div4_clks[DIV4_P], MSTPCR0, 10, 0),
 162         MSTP("scif0", &div4_clks[DIV4_P], MSTPCR0, 7, 0),
 163         MSTP("scif1", &div4_clks[DIV4_P], MSTPCR0, 6, 0),
 164         MSTP("scif2", &div4_clks[DIV4_P], MSTPCR0, 5, 0),
 165         MSTP("msiof0", &div4_clks[DIV4_P], MSTPCR0, 2, 0),
 166         MSTP("sbr0", &div4_clks[DIV4_P], MSTPCR0, 1, 0),
 167
 168         MSTP("i2c0", &div4_clks[DIV4_P], MSTPCR1, 9, 0),
 169
 170         MSTP("icb0", &div4_clks[DIV4_P], MSTPCR2, 27, 0),
 171         MSTP("meram0", &div4_clks[DIV4_P], MSTPCR2, 26, 0),
 172         MSTP("dacy1", &div4_clks[DIV4_P], MSTPCR2, 24, 0),
 173         MSTP("dacy0", &div4_clks[DIV4_P], MSTPCR2, 23, 0),
 174         MSTP("tsif0", &div4_clks[DIV4_P], MSTPCR2, 22, 0),
 175         MSTP("sdhi0", &div4_clks[DIV4_P], MSTPCR2, 18, 0),
 176         MSTP("mmcif0", &div4_clks[DIV4_P], MSTPCR2, 17, 0),
 177         MSTP("usbf0", &div4_clks[DIV4_P], MSTPCR2, 11, 0),
 178         MSTP("siu0", &div4_clks[DIV4_B], MSTPCR2, 9, 0),
 179         MSTP("veu1", &div4_clks[DIV4_B], MSTPCR2, 7, CLK_ENABLE_ON_INIT),
 180         MSTP("vou0", &div4_clks[DIV4_B], MSTPCR2, 5, 0),
 181         MSTP("beu0", &div4_clks[DIV4_B], MSTPCR2, 4, 0),
 182         MSTP("ceu0", &div4_clks[DIV4_B], MSTPCR2, 3, 0),
 183         MSTP("veu0", &div4_clks[DIV4_B], MSTPCR2, 2, CLK_ENABLE_ON_INIT),
 184         MSTP("vpu0", &div4_clks[DIV4_B], MSTPCR2, 1, CLK_ENABLE_ON_INIT),
 185         MSTP("lcdc0", &div4_clks[DIV4_B], MSTPCR2, 0, 0),
 186 };
 187
 188 int __init arch_clk_init(void)
 189 {
 190         int k, ret = 0;
 191
 192         /* autodetect extal or dll configuration */
 193         if (__raw_readl(PLLCR) & 0x1000)
 194                 pll_clk.parent = &dll_clk;
 195         else
 196                 pll_clk.parent = &extal_clk;
 197
 198         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 199                 ret = clk_register(main_clks[k]);
 200
 201         if (!ret)
 202                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 203
 204         if (!ret)
 205                 ret = sh_clk_div6_register(div6_clks, ARRAY_SIZE(div6_clks));
 206
 207         if (!ret)
 208                 ret = sh_clk_mstp32_register(mstp_clks, ARRAY_SIZE(mstp_clks));
 209
 210         return ret;
 211 }