1 /* 2 * arch/sh/kernel/cpu/sh3/clock-sh7709.c 3 * 4 * SH7709 support for the clock framework 5 * 6 * Copyright (C) 2005 Andriy Skulysh 7 * 8 * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c 9 * Copyright (C) 2005 Paul Mundt 10 * 11 * This file is subject to the terms and conditions of the GNU General Public 12 * License. See the file "COPYING" in the main directory of this archive 13 * for more details. 14 */ 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <asm/clock.h> 18 #include <asm/freq.h> 19 #include <asm/io.h> 20 21 static int stc_multipliers[] = { 1, 2, 4, 8, 3, 6, 1, 1 }; 22 static int ifc_divisors[] = { 1, 2, 4, 1, 3, 1, 1, 1 }; 23 static int pfc_divisors[] = { 1, 2, 4, 1, 3, 6, 1, 1 }; 24 25 static void set_bus_parent(struct clk *clk) 26 { 27 struct clk *bus_clk = clk_get(NULL, "bus_clk"); 28 clk->parent = bus_clk; 29 clk_put(bus_clk); 30 } 31 32 static void master_clk_init(struct clk *clk) 33 { 34 int frqcr = ctrl_inw(FRQCR); 35 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); 36 37 clk->rate *= pfc_divisors[idx]; 38 } 39 40 static struct clk_ops sh7709_master_clk_ops = { 41 .init = master_clk_init, 42 }; 43 44 static void module_clk_recalc(struct clk *clk) 45 { 46 int frqcr = ctrl_inw(FRQCR); 47 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); 48 49 clk->rate = clk->parent->rate / pfc_divisors[idx]; 50 } 51 52 static struct clk_ops sh7709_module_clk_ops = { 53 #ifdef CLOCK_MODE_0_1_2_7 54 .init = set_bus_parent, 55 #endif 56 .recalc = module_clk_recalc, 57 }; 58 59 static void bus_clk_recalc(struct clk *clk) 60 { 61 int frqcr = ctrl_inw(FRQCR); 62 int idx = (frqcr & 0x0080) ? 63 ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1; 64 65 clk->rate = clk->parent->rate * stc_multipliers[idx]; 66 } 67 68 static struct clk_ops sh7709_bus_clk_ops = { 69 .recalc = bus_clk_recalc, 70 }; 71 72 static void cpu_clk_recalc(struct clk *clk) 73 { 74 int frqcr = ctrl_inw(FRQCR); 75 int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2); 76 77 clk->rate = clk->parent->rate / ifc_divisors[idx]; 78 } 79 80 static struct clk_ops sh7709_cpu_clk_ops = { 81 .init = set_bus_parent, 82 .recalc = cpu_clk_recalc, 83 }; 84 85 static struct clk_ops *sh7709_clk_ops[] = { 86 &sh7709_master_clk_ops, 87 &sh7709_module_clk_ops, 88 &sh7709_bus_clk_ops, 89 &sh7709_cpu_clk_ops, 90 }; 91 92 void __init arch_init_clk_ops(struct clk_ops **ops, int idx) 93 { 94 if (idx < ARRAY_SIZE(sh7709_clk_ops)) 95 *ops = sh7709_clk_ops[idx]; 96 } 97