1/*
  2 * Copyright (C) 2015 Jens Kuske <jenskuske@gmail.com>
  3 *
  4 * Based on clk-simple-gates.c, which is:
  5 * Copyright 2015 Maxime Ripard
  6 *
  7 * Maxime Ripard <maxime.ripard@free-electrons.com>
  8 *
  9 * This program is free software; you can redistribute it and/or modify
 10 * it under the terms of the GNU General Public License as published by
 11 * the Free Software Foundation; either version 2 of the License, or
 12 * (at your option) any later version.
 13 *
 14 * This program is distributed in the hope that it will be useful,
 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17 * GNU General Public License for more details.
 18 */
 19
 20#include <linux/clk-provider.h>
 21#include <linux/of.h>
 22#include <linux/of_address.h>
 23#include <linux/slab.h>
 24#include <linux/spinlock.h>
 25
 26static DEFINE_SPINLOCK(gates_lock);
 27
 28static void __init sun8i_h3_bus_gates_init(struct device_node *node)
 29{
 30	static const char * const names[] = { "ahb1", "ahb2", "apb1", "apb2" };
 31	enum { AHB1, AHB2, APB1, APB2, PARENT_MAX } clk_parent;
 32	const char *parents[PARENT_MAX];
 33	struct clk_onecell_data *clk_data;
 34	const char *clk_name;
 35	struct property *prop;
 36	struct resource res;
 37	void __iomem *clk_reg;
 38	void __iomem *reg;
 39	const __be32 *p;
 40	int number, i;
 41	u8 clk_bit;
 42	int index;
 43
 44	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
 45	if (IS_ERR(reg))
 46		return;
 47
 48	for (i = 0; i < ARRAY_SIZE(names); i++) {
 49		int idx = of_property_match_string(node, "clock-names",
 50						   names[i]);
 51		if (idx < 0)
 52			return;
 53
 54		parents[i] = of_clk_get_parent_name(node, idx);
 55	}
 56
 57	clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
 58	if (!clk_data)
 59		goto err_unmap;
 60
 61	number = of_property_count_u32_elems(node, "clock-indices");
 62	of_property_read_u32_index(node, "clock-indices", number - 1, &number);
 63
 64	clk_data->clks = kcalloc(number + 1, sizeof(struct clk *), GFP_KERNEL);
 65	if (!clk_data->clks)
 66		goto err_free_data;
 67
 68	i = 0;
 69	of_property_for_each_u32(node, "clock-indices", prop, p, index) {
 70		of_property_read_string_index(node, "clock-output-names",
 71					      i, &clk_name);
 72
 73		if (index == 17 || (index >= 29 && index <= 31))
 74			clk_parent = AHB2;
 75		else if (index <= 63 || index >= 128)
 76			clk_parent = AHB1;
 77		else if (index >= 64 && index <= 95)
 78			clk_parent = APB1;
 79		else if (index >= 96 && index <= 127)
 80			clk_parent = APB2;
 81		else {
 82			WARN_ON(true);
 83			continue;
 84		}
 85
 86		clk_reg = reg + 4 * (index / 32);
 87		clk_bit = index % 32;
 88
 89		clk_data->clks[index] = clk_register_gate(NULL, clk_name,
 90							  parents[clk_parent],
 91							  0, clk_reg, clk_bit,
 92							  0, &gates_lock);
 93		i++;
 94
 95		if (IS_ERR(clk_data->clks[index])) {
 96			WARN_ON(true);
 97			continue;
 98		}
 99	}
100
101	clk_data->clk_num = number + 1;
102	of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
103
104	return;
105
106err_free_data:
107	kfree(clk_data);
108err_unmap:
109	iounmap(reg);
110	of_address_to_resource(node, 0, &res);
111	release_mem_region(res.start, resource_size(&res));
112}
113
114CLK_OF_DECLARE(sun8i_h3_bus_gates, "allwinner,sun8i-h3-bus-gates-clk",
115	       sun8i_h3_bus_gates_init);
116CLK_OF_DECLARE(sun8i_a83t_bus_gates, "allwinner,sun8i-a83t-bus-gates-clk",
117	       sun8i_h3_bus_gates_init);