1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/sh/kernel/cpu/sh3/clock-sh7710.c 4 * 5 * SH7710 support for the clock framework 6 * 7 * Copyright (C) 2005 Paul Mundt 8 * 9 * FRQCR parsing hacked out of arch/sh/kernel/time.c 10 * 11 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka 12 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> 13 * Copyright (C) 2002, 2003, 2004 Paul Mundt 14 * Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org> 15 */ 16 #include <linux/init.h> 17 #include <linux/kernel.h> 18 #include <asm/clock.h> 19 #include <asm/freq.h> 20 #include <asm/io.h> 21 22 static int md_table[] = { 1, 2, 3, 4, 6, 8, 12 }; 23 24 static void master_clk_init(struct clk *clk) 25 { 26 clk->rate *= md_table[__raw_readw(FRQCR) & 0x0007]; 27 } 28 29 static struct sh_clk_ops sh7710_master_clk_ops = { 30 .init = master_clk_init, 31 }; 32 33 static unsigned long module_clk_recalc(struct clk *clk) 34 { 35 int idx = (__raw_readw(FRQCR) & 0x0007); 36 return clk->parent->rate / md_table[idx]; 37 } 38 39 static struct sh_clk_ops sh7710_module_clk_ops = { 40 .recalc = module_clk_recalc, 41 }; 42 43 static unsigned long bus_clk_recalc(struct clk *clk) 44 { 45 int idx = (__raw_readw(FRQCR) & 0x0700) >> 8; 46 return clk->parent->rate / md_table[idx]; 47 } 48 49 static struct sh_clk_ops sh7710_bus_clk_ops = { 50 .recalc = bus_clk_recalc, 51 }; 52 53 static unsigned long cpu_clk_recalc(struct clk *clk) 54 { 55 int idx = (__raw_readw(FRQCR) & 0x0070) >> 4; 56 return clk->parent->rate / md_table[idx]; 57 } 58 59 static struct sh_clk_ops sh7710_cpu_clk_ops = { 60 .recalc = cpu_clk_recalc, 61 }; 62 63 static struct sh_clk_ops *sh7710_clk_ops[] = { 64 &sh7710_master_clk_ops, 65 &sh7710_module_clk_ops, 66 &sh7710_bus_clk_ops, 67 &sh7710_cpu_clk_ops, 68 }; 69 70 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) 71 { 72 if (idx < ARRAY_SIZE(sh7710_clk_ops)) 73 *ops = sh7710_clk_ops[idx]; 74 } 75 76