/* * arch/sh/kernel/cpu/sh3/clock-sh7706.c * * SH7706 support for the clock framework * * Copyright (C) 2006 Takashi YOSHII * * Based on arch/sh/kernel/cpu/sh3/clock-sh7709.c * Copyright (C) 2005 Andriy Skulysh * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/init.h> #include <linux/kernel.h> #include <asm/clock.h> #include <asm/freq.h> #include <asm/io.h> static int stc_multipliers[] = { 1, 2, 4, 1, 3, 6, 1, 1 }; static int ifc_divisors[] = { 1, 2, 4, 1, 3, 1, 1, 1 }; static int pfc_divisors[] = { 1, 2, 4, 1, 3, 6, 1, 1 }; static void master_clk_init(struct clk *clk) { int frqcr = __raw_readw(FRQCR); int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); clk->rate *= pfc_divisors[idx]; } static struct sh_clk_ops sh7706_master_clk_ops = { .init = master_clk_init, }; static unsigned long module_clk_recalc(struct clk *clk) { int frqcr = __raw_readw(FRQCR); int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); return clk->parent->rate / pfc_divisors[idx]; } static struct sh_clk_ops sh7706_module_clk_ops = { .recalc = module_clk_recalc, }; static unsigned long bus_clk_recalc(struct clk *clk) { int frqcr = __raw_readw(FRQCR); int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4); return clk->parent->rate / stc_multipliers[idx]; } static struct sh_clk_ops sh7706_bus_clk_ops = { .recalc = bus_clk_recalc, }; static unsigned long cpu_clk_recalc(struct clk *clk) { int frqcr = __raw_readw(FRQCR); int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2); return clk->parent->rate / ifc_divisors[idx]; } static struct sh_clk_ops sh7706_cpu_clk_ops = { .recalc = cpu_clk_recalc, }; static struct sh_clk_ops *sh7706_clk_ops[] = { &sh7706_master_clk_ops, &sh7706_module_clk_ops, &sh7706_bus_clk_ops, &sh7706_cpu_clk_ops, }; void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) { if (idx < ARRAY_SIZE(sh7706_clk_ops)) *ops = sh7706_clk_ops[idx]; }