1 /*
2  * Copyright 2016 Maxime Ripard
3  *
4  * Maxime Ripard <maxime.ripard@free-electrons.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  */
16 
17 #include <linux/clk-provider.h>
18 #include <linux/iopoll.h>
19 #include <linux/slab.h>
20 
21 #include "ccu_common.h"
22 #include "ccu_reset.h"
23 
24 static DEFINE_SPINLOCK(ccu_lock);
25 
26 void ccu_helper_wait_for_lock(struct ccu_common *common, u32 lock)
27 {
28 	u32 reg;
29 
30 	if (!lock)
31 		return;
32 
33 	WARN_ON(readl_relaxed_poll_timeout(common->base + common->reg, reg,
34 					   reg & lock, 100, 70000));
35 }
36 
37 int sunxi_ccu_probe(struct device_node *node, void __iomem *reg,
38 		    const struct sunxi_ccu_desc *desc)
39 {
40 	struct ccu_reset *reset;
41 	int i, ret;
42 
43 	for (i = 0; i < desc->num_ccu_clks; i++) {
44 		struct ccu_common *cclk = desc->ccu_clks[i];
45 
46 		if (!cclk)
47 			continue;
48 
49 		cclk->base = reg;
50 		cclk->lock = &ccu_lock;
51 	}
52 
53 	for (i = 0; i < desc->hw_clks->num ; i++) {
54 		struct clk_hw *hw = desc->hw_clks->hws[i];
55 
56 		if (!hw)
57 			continue;
58 
59 		ret = clk_hw_register(NULL, hw);
60 		if (ret) {
61 			pr_err("Couldn't register clock %s\n",
62 			       clk_hw_get_name(hw));
63 			goto err_clk_unreg;
64 		}
65 	}
66 
67 	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get,
68 				     desc->hw_clks);
69 	if (ret)
70 		goto err_clk_unreg;
71 
72 	reset = kzalloc(sizeof(*reset), GFP_KERNEL);
73 	reset->rcdev.of_node = node;
74 	reset->rcdev.ops = &ccu_reset_ops;
75 	reset->rcdev.owner = THIS_MODULE;
76 	reset->rcdev.nr_resets = desc->num_resets;
77 	reset->base = reg;
78 	reset->lock = &ccu_lock;
79 	reset->reset_map = desc->resets;
80 
81 	ret = reset_controller_register(&reset->rcdev);
82 	if (ret)
83 		goto err_of_clk_unreg;
84 
85 	return 0;
86 
87 err_of_clk_unreg:
88 err_clk_unreg:
89 	return ret;
90 }
91