| /* |
| * arch/sh/kernel/cpu/sh3/clock-sh7709.c |
| * |
| * SH7709 support for the clock framework |
| * |
| * Copyright (C) 2005 Andriy Skulysh |
| * |
| * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c |
| * Copyright (C) 2005 Paul Mundt |
| * |
| * 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, 8, 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 set_bus_parent(struct clk *clk) |
| { |
| struct clk *bus_clk = clk_get("bus_clk"); |
| clk->parent = bus_clk; |
| clk_put(bus_clk); |
| } |
| |
| 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 sh7709_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 sh7709_module_clk_ops = { |
| #ifdef CLOCK_MODE_0_1_2_7 |
| .init = set_bus_parent, |
| #endif |
| .recalc = module_clk_recalc, |
| }; |
| |
| static void bus_clk_recalc(struct clk *clk) |
| { |
| int frqcr = ctrl_inw(FRQCR); |
| int idx = (frqcr & 0x0080) ? |
| ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1; |
| |
| clk->rate = clk->parent->rate * stc_multipliers[idx]; |
| } |
| |
| static struct clk_ops sh7709_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 sh7709_cpu_clk_ops = { |
| .init = set_bus_parent, |
| .recalc = cpu_clk_recalc, |
| }; |
| |
| static struct clk_ops *sh7709_clk_ops[] = { |
| &sh7709_master_clk_ops, |
| &sh7709_module_clk_ops, |
| &sh7709_bus_clk_ops, |
| &sh7709_cpu_clk_ops, |
| }; |
| |
| void __init arch_init_clk_ops(struct clk_ops **ops, int idx) |
| { |
| if (idx < ARRAY_SIZE(sh7709_clk_ops)) |
| *ops = sh7709_clk_ops[idx]; |
| } |