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82 lines
1.9 KiB
82 lines
1.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/sh/kernel/cpu/sh3/clock-sh7709.c |
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* |
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* SH7709 support for the clock framework |
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* |
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* Copyright (C) 2005 Andriy Skulysh |
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* |
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* Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c |
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* Copyright (C) 2005 Paul Mundt |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <asm/clock.h> |
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#include <asm/freq.h> |
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#include <asm/io.h> |
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static int stc_multipliers[] = { 1, 2, 4, 8, 3, 6, 1, 1 }; |
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static int ifc_divisors[] = { 1, 2, 4, 1, 3, 1, 1, 1 }; |
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static int pfc_divisors[] = { 1, 2, 4, 1, 3, 6, 1, 1 }; |
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static void master_clk_init(struct clk *clk) |
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{ |
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int frqcr = __raw_readw(FRQCR); |
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int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); |
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clk->rate *= pfc_divisors[idx]; |
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} |
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static struct sh_clk_ops sh7709_master_clk_ops = { |
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.init = master_clk_init, |
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}; |
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static unsigned long module_clk_recalc(struct clk *clk) |
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{ |
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int frqcr = __raw_readw(FRQCR); |
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int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003); |
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return clk->parent->rate / pfc_divisors[idx]; |
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} |
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static struct sh_clk_ops sh7709_module_clk_ops = { |
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.recalc = module_clk_recalc, |
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}; |
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static unsigned long bus_clk_recalc(struct clk *clk) |
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{ |
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int frqcr = __raw_readw(FRQCR); |
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int idx = (frqcr & 0x0080) ? |
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((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1; |
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return clk->parent->rate * stc_multipliers[idx]; |
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} |
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static struct sh_clk_ops sh7709_bus_clk_ops = { |
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.recalc = bus_clk_recalc, |
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}; |
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static unsigned long cpu_clk_recalc(struct clk *clk) |
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{ |
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int frqcr = __raw_readw(FRQCR); |
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int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2); |
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return clk->parent->rate / ifc_divisors[idx]; |
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} |
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static struct sh_clk_ops sh7709_cpu_clk_ops = { |
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.recalc = cpu_clk_recalc, |
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}; |
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static struct sh_clk_ops *sh7709_clk_ops[] = { |
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&sh7709_master_clk_ops, |
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&sh7709_module_clk_ops, |
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&sh7709_bus_clk_ops, |
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&sh7709_cpu_clk_ops, |
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}; |
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void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) |
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{ |
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if (idx < ARRAY_SIZE(sh7709_clk_ops)) |
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*ops = sh7709_clk_ops[idx]; |
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}
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