diff options
Diffstat (limited to 'arch/sh/kernel/cpu/sh3/clock-sh7706.c')
-rw-r--r-- | arch/sh/kernel/cpu/sh3/clock-sh7706.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh3/clock-sh7706.c b/arch/sh/kernel/cpu/sh3/clock-sh7706.c new file mode 100644 index 00000000000..0cf96f9833b --- /dev/null +++ b/arch/sh/kernel/cpu/sh3/clock-sh7706.c @@ -0,0 +1,84 @@ +/* + * 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 = ctrl_inw(FRQCR); + int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); + + clk->rate *= pfc_divisors[idx]; +} + +static struct clk_ops sh7706_master_clk_ops = { + .init = master_clk_init, +}; + +static void module_clk_recalc(struct clk *clk) +{ + int frqcr = ctrl_inw(FRQCR); + int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); + + clk->rate = clk->parent->rate / pfc_divisors[idx]; +} + +static struct clk_ops sh7706_module_clk_ops = { + .recalc = module_clk_recalc, +}; + +static void bus_clk_recalc(struct clk *clk) +{ + int frqcr = ctrl_inw(FRQCR); + int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4); + + clk->rate = clk->parent->rate / stc_multipliers[idx]; +} + +static struct clk_ops sh7706_bus_clk_ops = { + .recalc = bus_clk_recalc, +}; + +static void cpu_clk_recalc(struct clk *clk) +{ + int frqcr = ctrl_inw(FRQCR); + int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2); + + clk->rate = clk->parent->rate / ifc_divisors[idx]; +} + +static struct clk_ops sh7706_cpu_clk_ops = { + .recalc = cpu_clk_recalc, +}; + +static struct 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 clk_ops **ops, int idx) +{ + if (idx < ARRAY_SIZE(sh7706_clk_ops)) + *ops = sh7706_clk_ops[idx]; +} |