diff options
Diffstat (limited to 'arch/sh/kernel/cpu/sh4/clock-sh4.c')
| -rw-r--r-- | arch/sh/kernel/cpu/sh4/clock-sh4.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh4/clock-sh4.c b/arch/sh/kernel/cpu/sh4/clock-sh4.c new file mode 100644 index 000000000..99e5ec8b4 --- /dev/null +++ b/arch/sh/kernel/cpu/sh4/clock-sh4.c @@ -0,0 +1,80 @@ +/* + * arch/sh/kernel/cpu/sh4/clock-sh4.c + * + * Generic SH-4 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> + +static int ifc_divisors[] = { 1, 2, 3, 4, 6, 8, 1, 1 }; +#define bfc_divisors ifc_divisors /* Same */ +static int pfc_divisors[] = { 2, 3, 4, 6, 8, 2, 2, 2 }; + +static void master_clk_init(struct clk *clk) +{ + clk->rate *= pfc_divisors[__raw_readw(FRQCR) & 0x0007]; +} + +static struct sh_clk_ops sh4_master_clk_ops = { + .init = master_clk_init, +}; + +static unsigned long module_clk_recalc(struct clk *clk) +{ + int idx = (__raw_readw(FRQCR) & 0x0007); + return clk->parent->rate / pfc_divisors[idx]; +} + +static struct sh_clk_ops sh4_module_clk_ops = { + .recalc = module_clk_recalc, +}; + +static unsigned long bus_clk_recalc(struct clk *clk) +{ + int idx = (__raw_readw(FRQCR) >> 3) & 0x0007; + return clk->parent->rate / bfc_divisors[idx]; +} + +static struct sh_clk_ops sh4_bus_clk_ops = { + .recalc = bus_clk_recalc, +}; + +static unsigned long cpu_clk_recalc(struct clk *clk) +{ + int idx = (__raw_readw(FRQCR) >> 6) & 0x0007; + return clk->parent->rate / ifc_divisors[idx]; +} + +static struct sh_clk_ops sh4_cpu_clk_ops = { + .recalc = cpu_clk_recalc, +}; + +static struct sh_clk_ops *sh4_clk_ops[] = { + &sh4_master_clk_ops, + &sh4_module_clk_ops, + &sh4_bus_clk_ops, + &sh4_cpu_clk_ops, +}; + +void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) +{ + if (idx < ARRAY_SIZE(sh4_clk_ops)) + *ops = sh4_clk_ops[idx]; +} + |