/* * arch/sh/kernel/cpu/sh3/clock-sh7705.c * * SH7705 support for the clock framework * * Copyright (C) 2005 Paul Mundt * * FRQCR parsing hacked out of arch/sh/kernel/time.c * * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> * Copyright (C) 2002, 2003, 2004 Paul Mundt * Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org> * * 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> /* * SH7705 uses the same divisors as the generic SH-3 case, it's just the * FRQCR layout that is a bit different.. */ static int stc_multipliers[] = { 1, 2, 3, 4, 6, 1, 1, 1 }; static int ifc_divisors[] = { 1, 2, 3, 4, 1, 1, 1, 1 }; static int pfc_divisors[] = { 1, 2, 3, 4, 6, 1, 1, 1 }; static void master_clk_init(struct clk *clk) { clk->rate *= pfc_divisors[__raw_readw(FRQCR) & 0x0003]; } static struct sh_clk_ops sh7705_master_clk_ops = { .init = master_clk_init, }; static unsigned long module_clk_recalc(struct clk *clk) { int idx = __raw_readw(FRQCR) & 0x0003; return clk->parent->rate / pfc_divisors[idx]; } static struct sh_clk_ops sh7705_module_clk_ops = { .recalc = module_clk_recalc, }; static unsigned long bus_clk_recalc(struct clk *clk) { int idx = (__raw_readw(FRQCR) & 0x0300) >> 8; return clk->parent->rate / stc_multipliers[idx]; } static struct sh_clk_ops sh7705_bus_clk_ops = { .recalc = bus_clk_recalc, }; static unsigned long cpu_clk_recalc(struct clk *clk) { int idx = (__raw_readw(FRQCR) & 0x0030) >> 4; return clk->parent->rate / ifc_divisors[idx]; } static struct sh_clk_ops sh7705_cpu_clk_ops = { .recalc = cpu_clk_recalc, }; static struct sh_clk_ops *sh7705_clk_ops[] = { &sh7705_master_clk_ops, &sh7705_module_clk_ops, &sh7705_bus_clk_ops, &sh7705_cpu_clk_ops, }; void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) { if (idx < ARRAY_SIZE(sh7705_clk_ops)) *ops = sh7705_clk_ops[idx]; }