mirror of https://gitee.com/openkylin/linux.git
119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2012, 2013, NVIDIA CORPORATION. All rights reserved.
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*/
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#include <linux/io.h>
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#include <linux/clk-provider.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/clk/tegra.h>
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#include "clk.h"
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#include "clk-id.h"
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#define OSC_CTRL 0x50
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#define OSC_CTRL_OSC_FREQ_SHIFT 28
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#define OSC_CTRL_PLL_REF_DIV_SHIFT 26
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#define OSC_CTRL_MASK (0x3f2 | \
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(0xf << OSC_CTRL_OSC_FREQ_SHIFT))
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static u32 osc_ctrl_ctx;
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int __init tegra_osc_clk_init(void __iomem *clk_base, struct tegra_clk *clks,
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unsigned long *input_freqs, unsigned int num,
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unsigned int clk_m_div, unsigned long *osc_freq,
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unsigned long *pll_ref_freq)
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{
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struct clk *clk, *osc;
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struct clk **dt_clk;
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u32 val, pll_ref_div;
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unsigned osc_idx;
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val = readl_relaxed(clk_base + OSC_CTRL);
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osc_ctrl_ctx = val & OSC_CTRL_MASK;
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osc_idx = val >> OSC_CTRL_OSC_FREQ_SHIFT;
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if (osc_idx < num)
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*osc_freq = input_freqs[osc_idx];
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else
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*osc_freq = 0;
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if (!*osc_freq) {
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WARN_ON(1);
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return -EINVAL;
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}
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dt_clk = tegra_lookup_dt_id(tegra_clk_osc, clks);
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if (!dt_clk)
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return 0;
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osc = clk_register_fixed_rate(NULL, "osc", NULL, 0, *osc_freq);
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*dt_clk = osc;
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/* osc_div2 */
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dt_clk = tegra_lookup_dt_id(tegra_clk_osc_div2, clks);
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if (dt_clk) {
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clk = clk_register_fixed_factor(NULL, "osc_div2", "osc",
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0, 1, 2);
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*dt_clk = clk;
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}
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/* osc_div4 */
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dt_clk = tegra_lookup_dt_id(tegra_clk_osc_div4, clks);
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if (dt_clk) {
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clk = clk_register_fixed_factor(NULL, "osc_div4", "osc",
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0, 1, 4);
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*dt_clk = clk;
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}
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dt_clk = tegra_lookup_dt_id(tegra_clk_clk_m, clks);
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if (!dt_clk)
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return 0;
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clk = clk_register_fixed_factor(NULL, "clk_m", "osc",
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0, 1, clk_m_div);
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*dt_clk = clk;
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/* pll_ref */
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val = (val >> OSC_CTRL_PLL_REF_DIV_SHIFT) & 3;
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pll_ref_div = 1 << val;
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dt_clk = tegra_lookup_dt_id(tegra_clk_pll_ref, clks);
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if (!dt_clk)
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return 0;
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clk = clk_register_fixed_factor(NULL, "pll_ref", "osc",
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0, 1, pll_ref_div);
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*dt_clk = clk;
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if (pll_ref_freq)
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*pll_ref_freq = *osc_freq / pll_ref_div;
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return 0;
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}
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void __init tegra_fixed_clk_init(struct tegra_clk *tegra_clks)
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{
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struct clk *clk;
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struct clk **dt_clk;
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/* clk_32k */
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dt_clk = tegra_lookup_dt_id(tegra_clk_clk_32k, tegra_clks);
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if (dt_clk) {
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clk = clk_register_fixed_rate(NULL, "clk_32k", NULL, 0, 32768);
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*dt_clk = clk;
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}
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}
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void tegra_clk_osc_resume(void __iomem *clk_base)
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{
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u32 val;
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val = readl_relaxed(clk_base + OSC_CTRL) & ~OSC_CTRL_MASK;
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val |= osc_ctrl_ctx;
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writel_relaxed(val, clk_base + OSC_CTRL);
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fence_udelay(2, clk_base);
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}
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