99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
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/*
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* Copyright (c) 2013 MundoReader S.L.
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* Author: Heiko Stuebner <heiko@sntech.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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static DEFINE_SPINLOCK(clk_lock);
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/*
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* Gate clocks
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*/
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static void __init rk2928_gate_clk_init(struct device_node *node)
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{
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struct clk_onecell_data *clk_data;
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const char *clk_parent;
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const char *clk_name;
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void __iomem *reg;
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void __iomem *reg_idx;
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int flags;
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int qty;
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int reg_bit;
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int clkflags = CLK_SET_RATE_PARENT;
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int i;
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qty = of_property_count_strings(node, "clock-output-names");
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if (qty < 0) {
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pr_err("%s: error in clock-output-names %d\n", __func__, qty);
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return;
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}
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if (qty == 0) {
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pr_info("%s: nothing to do\n", __func__);
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return;
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}
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reg = of_iomap(node, 0);
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if (!reg)
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return;
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clk_data = kzalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
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if (!clk_data) {
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iounmap(reg);
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return;
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}
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clk_data->clks = kzalloc(qty * sizeof(struct clk *), GFP_KERNEL);
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if (!clk_data->clks) {
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kfree(clk_data);
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iounmap(reg);
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return;
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}
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flags = CLK_GATE_HIWORD_MASK | CLK_GATE_SET_TO_DISABLE;
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for (i = 0; i < qty; i++) {
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of_property_read_string_index(node, "clock-output-names",
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i, &clk_name);
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/* ignore empty slots */
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if (!strcmp("reserved", clk_name))
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continue;
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clk_parent = of_clk_get_parent_name(node, i);
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/* keep all gates untouched for now */
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clkflags |= CLK_IGNORE_UNUSED;
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reg_idx = reg + (4 * (i / 16));
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reg_bit = (i % 16);
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clk_data->clks[i] = clk_register_gate(NULL, clk_name,
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clk_parent, clkflags,
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reg_idx, reg_bit,
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flags,
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&clk_lock);
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WARN_ON(IS_ERR(clk_data->clks[i]));
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}
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clk_data->clk_num = qty;
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of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
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}
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CLK_OF_DECLARE(rk2928_gate, "rockchip,rk2928-gate-clk", rk2928_gate_clk_init);
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