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 <asm/clock.h> 25 26 /* SH7722 registers */ 27 #define FRQCR 0xa4150000 28 #define VCLKCR 0xa4150004 29 #define SCLKACR 0xa4150008 30 #define SCLKBCR 0xa415000c 31 #define IRDACLKCR 0xa4150018 32 #define PLLCR 0xa4150024 33 #define MSTPCR0 0xa4150030 34 #define MSTPCR1 0xa4150034 35 #define MSTPCR2 0xa4150038 36 #define DLLFRQ 0xa4150050 37 38 /* Fixed 32 KHz root clock for RTC and Power Management purposes */ 39 static struct clk r_clk = { 40 .name = "rclk", 41 .id = -1, 42 .rate = 32768, 43 }; 44 45 /* 46 * Default rate for the root input clock, reset this with clk_set_rate() 47 * from the platform code. 48 */ 49 struct clk extal_clk = { 50 .name = "extal", 51 .id = -1, 52 .rate = 33333333, 53 }; 54 55 /* The dll block 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 clk_ops dll_clk_ops = { 69 .recalc = dll_recalc, 70 }; 71 72 static struct clk dll_clk = { 73 .name = "dll_clk", 74 .id = -1, 75 .ops = &dll_clk_ops, 76 .parent = &r_clk, 77 .flags = CLK_ENABLE_ON_INIT, 78 }; 79 80 static unsigned long pll_recalc(struct clk *clk) 81 { 82 unsigned long mult = 1; 83 unsigned long div = 1; 84 85 if (__raw_readl(PLLCR) & 0x4000) 86 mult = (((__raw_readl(FRQCR) >> 24) & 0x1f) + 1); 87 else 88 div = 2; 89 90 return (clk->parent->rate * mult) / div; 91 } 92 93 static struct clk_ops pll_clk_ops = { 94 .recalc = pll_recalc, 95 }; 96 97 static struct clk pll_clk = { 98 .name = "pll_clk", 99 .id = -1, 100 .ops = &pll_clk_ops, 101 .flags = CLK_ENABLE_ON_INIT, 102 }; 103 104 struct clk *main_clks[] = { 105 &r_clk, 106 &extal_clk, 107 &dll_clk, 108 &pll_clk, 109 }; 110 111 static int multipliers[] = { 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 }; 112 static int divisors[] = { 1, 3, 2, 5, 3, 4, 5, 6, 8, 10, 12, 16, 20 }; 113 114 static struct clk_div_mult_table div4_table = { 115 .divisors = divisors, 116 .nr_divisors = ARRAY_SIZE(divisors), 117 .multipliers = multipliers, 118 .nr_multipliers = ARRAY_SIZE(multipliers), 119 }; 120 121 enum { DIV4_I, DIV4_U, DIV4_SH, DIV4_B, DIV4_B3, DIV4_P, 122 DIV4_SIUA, DIV4_SIUB, DIV4_IRDA, DIV4_NR }; 123 124 #define DIV4(_str, _reg, _bit, _mask, _flags) \ 125 SH_CLK_DIV4(_str, &pll_clk, _reg, _bit, _mask, _flags) 126 127 struct clk div4_clks[DIV4_NR] = { 128 [DIV4_I] = DIV4("cpu_clk", FRQCR, 20, 0x1fef, CLK_ENABLE_ON_INIT), 129 [DIV4_U] = DIV4("umem_clk", FRQCR, 16, 0x1fff, CLK_ENABLE_ON_INIT), 130 [DIV4_SH] = DIV4("shyway_clk", FRQCR, 12, 0x1fff, CLK_ENABLE_ON_INIT), 131 [DIV4_B] = DIV4("bus_clk", FRQCR, 8, 0x1fff, CLK_ENABLE_ON_INIT), 132 [DIV4_B3] = DIV4("b3_clk", FRQCR, 4, 0x1fff, CLK_ENABLE_ON_INIT), 133 [DIV4_P] = DIV4("peripheral_clk", FRQCR, 0, 0x1fff, 0), 134 [DIV4_SIUA] = DIV4("siua_clk", SCLKACR, 0, 0x1fff, 0), 135 [DIV4_SIUB] = DIV4("siub_clk", SCLKBCR, 0, 0x1fff, 0), 136 [DIV4_IRDA] = DIV4("irda_clk", IRDACLKCR, 0, 0x1fff, 0), 137 }; 138 139 struct clk div6_clks[] = { 140 SH_CLK_DIV6("video_clk", &pll_clk, VCLKCR, 0), 141 }; 142 143 #define MSTP(_str, _parent, _reg, _bit, _flags) \ 144 SH_CLK_MSTP32(_str, -1, _parent, _reg, _bit, _flags) 145 146 static struct clk mstp_clks[] = { 147 MSTP("uram0", &div4_clks[DIV4_U], MSTPCR0, 28, CLK_ENABLE_ON_INIT), 148 MSTP("xymem0", &div4_clks[DIV4_B], MSTPCR0, 26, CLK_ENABLE_ON_INIT), 149 MSTP("tmu0", &div4_clks[DIV4_P], MSTPCR0, 15, 0), 150 MSTP("cmt0", &r_clk, MSTPCR0, 14, 0), 151 MSTP("rwdt0", &r_clk, MSTPCR0, 13, 0), 152 MSTP("flctl0", &div4_clks[DIV4_P], MSTPCR0, 10, 0), 153 MSTP("scif0", &div4_clks[DIV4_P], MSTPCR0, 7, 0), 154 MSTP("scif1", &div4_clks[DIV4_P], MSTPCR0, 6, 0), 155 MSTP("scif2", &div4_clks[DIV4_P], MSTPCR0, 5, 0), 156 157 MSTP("i2c0", &div4_clks[DIV4_P], MSTPCR1, 9, 0), 158 MSTP("rtc0", &r_clk, MSTPCR1, 8, 0), 159 160 MSTP("sdhi0", &div4_clks[DIV4_P], MSTPCR2, 18, 0), 161 MSTP("keysc0", &r_clk, MSTPCR2, 14, 0), 162 MSTP("usbf0", &div4_clks[DIV4_P], MSTPCR2, 11, 0), 163 MSTP("2dg0", &div4_clks[DIV4_B], MSTPCR2, 9, 0), 164 MSTP("siu0", &div4_clks[DIV4_B], MSTPCR2, 8, 0), 165 MSTP("vou0", &div4_clks[DIV4_B], MSTPCR2, 5, 0), 166 MSTP("jpu0", &div4_clks[DIV4_B], MSTPCR2, 6, CLK_ENABLE_ON_INIT), 167 MSTP("beu0", &div4_clks[DIV4_B], MSTPCR2, 4, 0), 168 MSTP("ceu0", &div4_clks[DIV4_B], MSTPCR2, 3, 0), 169 MSTP("veu0", &div4_clks[DIV4_B], MSTPCR2, 2, CLK_ENABLE_ON_INIT), 170 MSTP("vpu0", &div4_clks[DIV4_B], MSTPCR2, 1, CLK_ENABLE_ON_INIT), 171 MSTP("lcdc0", &div4_clks[DIV4_B], MSTPCR2, 0, 0), 172 }; 173 174 int __init arch_clk_init(void) 175 { 176 int k, ret = 0; 177 178 /* autodetect extal or dll configuration */ 179 if (__raw_readl(PLLCR) & 0x1000) 180 pll_clk.parent = &dll_clk; 181 else 182 pll_clk.parent = &extal_clk; 183 184 for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++) 185 ret = clk_register(main_clks[k]); 186 187 if (!ret) 188 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table); 189 190 if (!ret) 191 ret = sh_clk_div6_register(div6_clks, ARRAY_SIZE(div6_clks)); 192 193 if (!ret) 194 ret = sh_clk_mstp32_register(mstp_clks, ARRAY_SIZE(mstp_clks)); 195 196 return ret; 197 } 198