91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
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/*
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* Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/device.h>
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#include <linux/of_address.h>
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#include <linux/tegra-aon.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/mutex.h>
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#include <soc/tegra/tegra-aon-ivc-pllaon.h>
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static int clk_aon_enable(struct clk_hw *hw)
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{
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/* Send IVC to SPE */
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return tegra_aon_set_pllaon_state(1);
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}
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static void clk_aon_disable(struct clk_hw *hw)
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{
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/* Send IVC to SPE */
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(void)tegra_aon_set_pllaon_state(0);
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}
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static int clk_aon_is_enabled(struct clk_hw *hw)
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{
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/* Check status from SPE */
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return tegra_aon_get_pllaon_state();
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}
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const struct clk_ops tegra_clk_aon_gate_ops = {
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.is_prepared = clk_aon_is_enabled,
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.prepare = clk_aon_enable,
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.unprepare = clk_aon_disable,
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};
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struct tegra_clk_aon {
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struct clk_hw hw;
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int clk_num;
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} aon_clk;
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static DEFINE_MUTEX(clk_aon_lock);
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static struct clk *tegra_of_aon_clk_src_onecell_get(
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struct of_phandle_args *clkspec,
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void *data)
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{
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struct clk_init_data init;
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static struct clk *aon_clk_obj;
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const char *clk_name = "spe_pll_aon";
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mutex_lock(&clk_aon_lock);
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if (!aon_clk_obj) {
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memset(&init, 0, sizeof(struct clk_init_data));
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init.name = clk_name;
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init.flags = 0;
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init.ops = &tegra_clk_aon_gate_ops;
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aon_clk.clk_num = clkspec->args[1];
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aon_clk.hw.init = &init;
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aon_clk_obj = clk_register(NULL, &aon_clk.hw);
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if (IS_ERR(aon_clk_obj)) {
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pr_err("registration of pll_aon as aon clock failed clk_num: %d\n",
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aon_clk.clk_num);
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}
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}
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mutex_unlock(&clk_aon_lock);
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pr_info("PLL_AON clock registered\n");
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return aon_clk_obj;
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}
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int tegra_aon_clk_init(struct device_node *np)
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{
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int r;
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r = of_clk_add_provider(np, tegra_of_aon_clk_src_onecell_get, NULL);
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pr_info("%s: %s\n", __func__, r ? "failed" : "ok");
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return r;
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}
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