1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/sh/kernel/cpu/sh2a/clock-sh7201.c 4 * 5 * SH7201 support for the clock framework 6 * 7 * Copyright (C) 2008 Peter Griffin <pgriffin@mpc-data.co.uk> 8 * 9 * Based on clock-sh4.c 10 * Copyright (C) 2005 Paul Mundt 11 */ 12 #include <linux/init.h> 13 #include <linux/kernel.h> 14 #include <asm/clock.h> 15 #include <asm/freq.h> 16 #include <asm/io.h> 17 18 static const int pll1rate[]={1,2,3,4,6,8}; 19 static const int pfc_divisors[]={1,2,3,4,6,8,12}; 20 #define ifc_divisors pfc_divisors 21 22 static unsigned int pll2_mult; 23 24 static void master_clk_init(struct clk *clk) 25 { 26 clk->rate = 10000000 * pll2_mult * 27 pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0007]; 28 } 29 30 static struct sh_clk_ops sh7201_master_clk_ops = { 31 .init = master_clk_init, 32 }; 33 34 static unsigned long module_clk_recalc(struct clk *clk) 35 { 36 int idx = (__raw_readw(FREQCR) & 0x0007); 37 return clk->parent->rate / pfc_divisors[idx]; 38 } 39 40 static struct sh_clk_ops sh7201_module_clk_ops = { 41 .recalc = module_clk_recalc, 42 }; 43 44 static unsigned long bus_clk_recalc(struct clk *clk) 45 { 46 int idx = (__raw_readw(FREQCR) & 0x0007); 47 return clk->parent->rate / pfc_divisors[idx]; 48 } 49 50 static struct sh_clk_ops sh7201_bus_clk_ops = { 51 .recalc = bus_clk_recalc, 52 }; 53 54 static unsigned long cpu_clk_recalc(struct clk *clk) 55 { 56 int idx = ((__raw_readw(FREQCR) >> 4) & 0x0007); 57 return clk->parent->rate / ifc_divisors[idx]; 58 } 59 60 static struct sh_clk_ops sh7201_cpu_clk_ops = { 61 .recalc = cpu_clk_recalc, 62 }; 63 64 static struct sh_clk_ops *sh7201_clk_ops[] = { 65 &sh7201_master_clk_ops, 66 &sh7201_module_clk_ops, 67 &sh7201_bus_clk_ops, 68 &sh7201_cpu_clk_ops, 69 }; 70 71 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) 72 { 73 if (test_mode_pin(MODE_PIN1 | MODE_PIN0)) 74 pll2_mult = 1; 75 else if (test_mode_pin(MODE_PIN1)) 76 pll2_mult = 2; 77 else 78 pll2_mult = 4; 79 80 if (idx < ARRAY_SIZE(sh7201_clk_ops)) 81 *ops = sh7201_clk_ops[idx]; 82 } 83