forked from rrcarlosr/Jetpack
132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
/*
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* Copyright (c) 2016-2017, 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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/clk-provider.h>
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include "clk-tegra-bpmp.h"
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struct fclk {
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struct clk_hw hw;
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unsigned long rate;
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};
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static int fclk_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct fclk *fclk = container_of(hw, struct fclk, hw);
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fclk->rate = rate;
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return 0;
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}
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static unsigned long fclk_get_rate(struct clk_hw *hw, unsigned long parent_rate)
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{
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struct fclk *fclk = container_of(hw, struct fclk, hw);
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return fclk->rate;
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}
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static long fclk_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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return rate;
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}
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static const struct clk_ops fclk_ops = {
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.set_rate = fclk_set_rate,
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.recalc_rate = fclk_get_rate,
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.round_rate = fclk_round_rate
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};
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static struct clk_onecell_data clk_data;
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struct clk *tegra_fclk_init(int clk_num, char *name, size_t sz)
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{
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struct fclk *fclk;
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struct clk_init_data init;
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fclk = kzalloc(sizeof(*fclk), GFP_KERNEL);
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if (!fclk)
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return ERR_PTR(-ENOMEM);
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snprintf(name, sz, "fclk%3d", clk_num);
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name[sz - 1] = 0;
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init.name = name;
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init.flags = 0;
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init.num_parents = 0;
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init.parent_names = NULL;
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init.ops = &fclk_ops;
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fclk->hw.init = &init;
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return clk_register(NULL, &fclk->hw);
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}
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static struct clk *tegra_of_clk_src_fclkget(struct of_phandle_args *clkspec,
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void *data)
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{
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struct clk_onecell_data *clk_data = data;
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unsigned int idx = clkspec->args[0];
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char name[16];
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const size_t sz = sizeof(name);
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struct clk *clk;
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int r;
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if (idx >= clk_data->clk_num) {
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pr_err("%s() bad clk idx %d\n", __func__, idx);
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return ERR_PTR(-EINVAL);
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}
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if (clk_data->clks[idx])
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return clk_data->clks[idx];
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clk = tegra_fclk_init(idx, name, sz);
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if (IS_ERR_OR_NULL(clk)) {
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r = PTR_ERR(clk);
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pr_err("%s() failed to init clk %d (%d)\n", __func__, idx, r);
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clk = ERR_PTR(-EINVAL);
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}
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clk_data->clks[idx] = clk;
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return clk;
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}
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int tegra_fake_clks_init(struct device_node *np)
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{
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const int num_clks = 1023;
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struct clk **pclks;
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pclks = kcalloc(num_clks + 1, sizeof(*pclks), GFP_KERNEL);
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if (!pclks) {
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WARN_ON(1);
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return -ENOMEM;
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}
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clk_data.clks = pclks;
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clk_data.clk_num = num_clks;
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return of_clk_add_provider(np, tegra_of_clk_src_fclkget, &clk_data);
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}
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