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2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2016 Yang Ling <gnaygnil@gmail.com>
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*/
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <loongson1.h>
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#include "clk.h"
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#define OSC (24 * 1000000)
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#define DIV_APB 1
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static DEFINE_SPINLOCK(_lock);
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static unsigned long ls1x_pll_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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u32 pll, rate;
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pll = __raw_readl(LS1X_CLK_PLL_FREQ);
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rate = ((pll >> 8) & 0xff) + ((pll >> 16) & 0xff);
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rate *= OSC;
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rate >>= 2;
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return rate;
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}
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static const struct clk_ops ls1x_pll_clk_ops = {
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.recalc_rate = ls1x_pll_recalc_rate,
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};
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static const struct clk_div_table ahb_div_table[] = {
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[0] = { .val = 0, .div = 2 },
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[1] = { .val = 1, .div = 4 },
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[2] = { .val = 2, .div = 3 },
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[3] = { .val = 3, .div = 3 },
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};
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void __init ls1x_clk_init(void)
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{
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struct clk_hw *hw;
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hw = clk_hw_register_fixed_rate(NULL, "osc_clk", NULL, 0, OSC);
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clk_hw_register_clkdev(hw, "osc_clk", NULL);
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/* clock derived from 24 MHz OSC clk */
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hw = clk_hw_register_pll(NULL, "pll_clk", "osc_clk",
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&ls1x_pll_clk_ops, 0);
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clk_hw_register_clkdev(hw, "pll_clk", NULL);
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hw = clk_hw_register_divider(NULL, "cpu_clk_div", "pll_clk",
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CLK_GET_RATE_NOCACHE, LS1X_CLK_PLL_DIV,
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DIV_CPU_SHIFT, DIV_CPU_WIDTH,
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CLK_DIVIDER_ONE_BASED |
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CLK_DIVIDER_ROUND_CLOSEST, &_lock);
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clk_hw_register_clkdev(hw, "cpu_clk_div", NULL);
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hw = clk_hw_register_fixed_factor(NULL, "cpu_clk", "cpu_clk_div",
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0, 1, 1);
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clk_hw_register_clkdev(hw, "cpu_clk", NULL);
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hw = clk_hw_register_divider(NULL, "dc_clk_div", "pll_clk",
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0, LS1X_CLK_PLL_DIV, DIV_DC_SHIFT,
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DIV_DC_WIDTH, CLK_DIVIDER_ONE_BASED, &_lock);
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clk_hw_register_clkdev(hw, "dc_clk_div", NULL);
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hw = clk_hw_register_fixed_factor(NULL, "dc_clk", "dc_clk_div",
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0, 1, 1);
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clk_hw_register_clkdev(hw, "dc_clk", NULL);
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hw = clk_hw_register_divider_table(NULL, "ahb_clk_div", "cpu_clk_div",
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0, LS1X_CLK_PLL_FREQ, DIV_DDR_SHIFT,
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DIV_DDR_WIDTH, CLK_DIVIDER_ALLOW_ZERO,
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ahb_div_table, &_lock);
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clk_hw_register_clkdev(hw, "ahb_clk_div", NULL);
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hw = clk_hw_register_fixed_factor(NULL, "ahb_clk", "ahb_clk_div",
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0, 1, 1);
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clk_hw_register_clkdev(hw, "ahb_clk", NULL);
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clk_hw_register_clkdev(hw, "ls1x-dma", NULL);
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clk_hw_register_clkdev(hw, "stmmaceth", NULL);
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/* clock derived from AHB clk */
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hw = clk_hw_register_fixed_factor(NULL, "apb_clk", "ahb_clk", 0, 1,
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DIV_APB);
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clk_hw_register_clkdev(hw, "apb_clk", NULL);
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clk_hw_register_clkdev(hw, "ls1x-ac97", NULL);
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clk_hw_register_clkdev(hw, "ls1x-i2c", NULL);
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clk_hw_register_clkdev(hw, "ls1x-nand", NULL);
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clk_hw_register_clkdev(hw, "ls1x-pwmtimer", NULL);
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clk_hw_register_clkdev(hw, "ls1x-spi", NULL);
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clk_hw_register_clkdev(hw, "ls1x-wdt", NULL);
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clk_hw_register_clkdev(hw, "serial8250", NULL);
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}
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