1 /* 2 * arch/sh/kernel/cpu/sh2a/clock-sh7269.c 3 * 4 * SH7269 clock framework support 5 * 6 * Copyright (C) 2012 Phil Edworthy 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file "COPYING" in the main directory of this archive 10 * for more details. 11 */ 12 #include <linux/init.h> 13 #include <linux/kernel.h> 14 #include <linux/io.h> 15 #include <linux/clkdev.h> 16 #include <asm/clock.h> 17 18 /* SH7269 registers */ 19 #define FRQCR 0xfffe0010 20 #define STBCR3 0xfffe0408 21 #define STBCR4 0xfffe040c 22 #define STBCR5 0xfffe0410 23 #define STBCR6 0xfffe0414 24 #define STBCR7 0xfffe0418 25 26 #define PLL_RATE 20 27 28 /* Fixed 32 KHz root clock for RTC */ 29 static struct clk r_clk = { 30 .rate = 32768, 31 }; 32 33 /* 34 * Default rate for the root input clock, reset this with clk_set_rate() 35 * from the platform code. 36 */ 37 static struct clk extal_clk = { 38 .rate = 13340000, 39 }; 40 41 static unsigned long pll_recalc(struct clk *clk) 42 { 43 return clk->parent->rate * PLL_RATE; 44 } 45 46 static struct sh_clk_ops pll_clk_ops = { 47 .recalc = pll_recalc, 48 }; 49 50 static struct clk pll_clk = { 51 .ops = &pll_clk_ops, 52 .parent = &extal_clk, 53 .flags = CLK_ENABLE_ON_INIT, 54 }; 55 56 static unsigned long peripheral0_recalc(struct clk *clk) 57 { 58 return clk->parent->rate / 8; 59 } 60 61 static struct sh_clk_ops peripheral0_clk_ops = { 62 .recalc = peripheral0_recalc, 63 }; 64 65 static struct clk peripheral0_clk = { 66 .ops = &peripheral0_clk_ops, 67 .parent = &pll_clk, 68 .flags = CLK_ENABLE_ON_INIT, 69 }; 70 71 static unsigned long peripheral1_recalc(struct clk *clk) 72 { 73 return clk->parent->rate / 4; 74 } 75 76 static struct sh_clk_ops peripheral1_clk_ops = { 77 .recalc = peripheral1_recalc, 78 }; 79 80 static struct clk peripheral1_clk = { 81 .ops = &peripheral1_clk_ops, 82 .parent = &pll_clk, 83 .flags = CLK_ENABLE_ON_INIT, 84 }; 85 86 struct clk *main_clks[] = { 87 &r_clk, 88 &extal_clk, 89 &pll_clk, 90 &peripheral0_clk, 91 &peripheral1_clk, 92 }; 93 94 static int div2[] = { 1, 2, 0, 4 }; 95 96 static struct clk_div_mult_table div4_div_mult_table = { 97 .divisors = div2, 98 .nr_divisors = ARRAY_SIZE(div2), 99 }; 100 101 static struct clk_div4_table div4_table = { 102 .div_mult_table = &div4_div_mult_table, 103 }; 104 105 enum { DIV4_I, DIV4_B, 106 DIV4_NR }; 107 108 #define DIV4(_reg, _bit, _mask, _flags) \ 109 SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags) 110 111 /* The mask field specifies the div2 entries that are valid */ 112 struct clk div4_clks[DIV4_NR] = { 113 [DIV4_I] = DIV4(FRQCR, 8, 0xB, CLK_ENABLE_REG_16BIT 114 | CLK_ENABLE_ON_INIT), 115 [DIV4_B] = DIV4(FRQCR, 4, 0xA, CLK_ENABLE_REG_16BIT 116 | CLK_ENABLE_ON_INIT), 117 }; 118 119 enum { MSTP72, 120 MSTP60, 121 MSTP47, MSTP46, MSTP45, MSTP44, MSTP43, MSTP42, MSTP41, MSTP40, 122 MSTP35, MSTP32, MSTP30, 123 MSTP_NR }; 124 125 static struct clk mstp_clks[MSTP_NR] = { 126 [MSTP72] = SH_CLK_MSTP8(&peripheral0_clk, STBCR7, 2, 0), /* CMT */ 127 [MSTP60] = SH_CLK_MSTP8(&peripheral1_clk, STBCR6, 0, 0), /* USB */ 128 [MSTP47] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 7, 0), /* SCIF0 */ 129 [MSTP46] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 6, 0), /* SCIF1 */ 130 [MSTP45] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 5, 0), /* SCIF2 */ 131 [MSTP44] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 4, 0), /* SCIF3 */ 132 [MSTP43] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 3, 0), /* SCIF4 */ 133 [MSTP42] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 2, 0), /* SCIF5 */ 134 [MSTP41] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 1, 0), /* SCIF6 */ 135 [MSTP40] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 0, 0), /* SCIF7 */ 136 [MSTP35] = SH_CLK_MSTP8(&peripheral0_clk, STBCR3, 5, 0), /* MTU2 */ 137 [MSTP32] = SH_CLK_MSTP8(&peripheral1_clk, STBCR3, 2, 0), /* ADC */ 138 [MSTP30] = SH_CLK_MSTP8(&r_clk, STBCR3, 0, 0), /* RTC */ 139 }; 140 141 static struct clk_lookup lookups[] = { 142 /* main clocks */ 143 CLKDEV_CON_ID("rclk", &r_clk), 144 CLKDEV_CON_ID("extal", &extal_clk), 145 CLKDEV_CON_ID("pll_clk", &pll_clk), 146 CLKDEV_CON_ID("peripheral_clk", &peripheral1_clk), 147 148 /* DIV4 clocks */ 149 CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]), 150 CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]), 151 152 /* MSTP clocks */ 153 CLKDEV_ICK_ID("sci_fck", "sh-sci.0", &mstp_clks[MSTP47]), 154 CLKDEV_ICK_ID("sci_fck", "sh-sci.1", &mstp_clks[MSTP46]), 155 CLKDEV_ICK_ID("sci_fck", "sh-sci.2", &mstp_clks[MSTP45]), 156 CLKDEV_ICK_ID("sci_fck", "sh-sci.3", &mstp_clks[MSTP44]), 157 CLKDEV_ICK_ID("sci_fck", "sh-sci.4", &mstp_clks[MSTP43]), 158 CLKDEV_ICK_ID("sci_fck", "sh-sci.5", &mstp_clks[MSTP42]), 159 CLKDEV_ICK_ID("sci_fck", "sh-sci.6", &mstp_clks[MSTP41]), 160 CLKDEV_ICK_ID("sci_fck", "sh-sci.7", &mstp_clks[MSTP40]), 161 CLKDEV_CON_ID("cmt_fck", &mstp_clks[MSTP72]), 162 CLKDEV_CON_ID("usb0", &mstp_clks[MSTP60]), 163 CLKDEV_CON_ID("mtu2_fck", &mstp_clks[MSTP35]), 164 CLKDEV_CON_ID("adc0", &mstp_clks[MSTP32]), 165 CLKDEV_CON_ID("rtc0", &mstp_clks[MSTP30]), 166 }; 167 168 int __init arch_clk_init(void) 169 { 170 int k, ret = 0; 171 172 for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++) 173 ret = clk_register(main_clks[k]); 174 175 clkdev_add_table(lookups, ARRAY_SIZE(lookups)); 176 177 if (!ret) 178 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table); 179 180 if (!ret) 181 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR); 182 183 return ret; 184 } 185