1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2013-2015 Emilio L��pez
4 *
5 * Emilio L��pez <emilio@elopez.com.ar>
6 */
7
8#include <linux/clk.h>
9#include <linux/clk-provider.h>
10#include <linux/io.h>
11#include <linux/of.h>
12#include <linux/of_address.h>
13#include <linux/reset-controller.h>
14#include <linux/slab.h>
15#include <linux/spinlock.h>
16
17
18/*
19 * sunxi_usb_reset... - reset bits in usb clk registers handling
20 */
21
22struct usb_reset_data {
23	void __iomem			*reg;
24	spinlock_t			*lock;
25	struct clk			*clk;
26	struct reset_controller_dev	rcdev;
27};
28
29static int sunxi_usb_reset_assert(struct reset_controller_dev *rcdev,
30			      unsigned long id)
31{
32	struct usb_reset_data *data = container_of(rcdev,
33						   struct usb_reset_data,
34						   rcdev);
35	unsigned long flags;
36	u32 reg;
37
38	clk_prepare_enable(data->clk);
39	spin_lock_irqsave(data->lock, flags);
40
41	reg = readl(data->reg);
42	writel(reg & ~BIT(id), data->reg);
43
44	spin_unlock_irqrestore(data->lock, flags);
45	clk_disable_unprepare(data->clk);
46
47	return 0;
48}
49
50static int sunxi_usb_reset_deassert(struct reset_controller_dev *rcdev,
51				unsigned long id)
52{
53	struct usb_reset_data *data = container_of(rcdev,
54						     struct usb_reset_data,
55						     rcdev);
56	unsigned long flags;
57	u32 reg;
58
59	clk_prepare_enable(data->clk);
60	spin_lock_irqsave(data->lock, flags);
61
62	reg = readl(data->reg);
63	writel(reg | BIT(id), data->reg);
64
65	spin_unlock_irqrestore(data->lock, flags);
66	clk_disable_unprepare(data->clk);
67
68	return 0;
69}
70
71static const struct reset_control_ops sunxi_usb_reset_ops = {
72	.assert		= sunxi_usb_reset_assert,
73	.deassert	= sunxi_usb_reset_deassert,
74};
75
76
77#define SUNXI_USB_MAX_SIZE 32
78
79struct usb_clk_data {
80	u32 clk_mask;
81	u32 reset_mask;
82	bool reset_needs_clk;
83};
84
85/**
86 * sunxi_usb_clk_setup() - Setup function for usb gate clocks
87 * @node: &struct device_node for the clock
88 * @data: &struct usb_clk_data for the clock
89 * @lock: spinlock for the clock
90 */
91static void __init sunxi_usb_clk_setup(struct device_node *node,
92				       const struct usb_clk_data *data,
93				       spinlock_t *lock)
94{
95	struct clk_onecell_data *clk_data;
96	struct usb_reset_data *reset_data;
97	const char *clk_parent;
98	const char *clk_name;
99	void __iomem *reg;
100	int qty;
101	int i = 0;
102	int j = 0;
103
104	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
105	if (IS_ERR(reg))
106		return;
107
108	clk_parent = of_clk_get_parent_name(node, 0);
109	if (!clk_parent)
110		return;
111
112	/* Worst-case size approximation and memory allocation */
113	qty = find_last_bit((unsigned long *)&data->clk_mask,
114			    SUNXI_USB_MAX_SIZE);
115
116	clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
117	if (!clk_data)
118		return;
119
120	clk_data->clks = kcalloc(qty + 1, sizeof(struct clk *), GFP_KERNEL);
121	if (!clk_data->clks) {
122		kfree(clk_data);
123		return;
124	}
125
126	for_each_set_bit(i, (unsigned long *)&data->clk_mask,
127			 SUNXI_USB_MAX_SIZE) {
128		of_property_read_string_index(node, "clock-output-names",
129					      j, &clk_name);
130		clk_data->clks[i] = clk_register_gate(NULL, clk_name,
131						      clk_parent, 0,
132						      reg, i, 0, lock);
133		WARN_ON(IS_ERR(clk_data->clks[i]));
134
135		j++;
136	}
137
138	/* Adjust to the real max */
139	clk_data->clk_num = i;
140
141	of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
142
143	/* Register a reset controller for usb with reset bits */
144	if (data->reset_mask == 0)
145		return;
146
147	reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
148	if (!reset_data)
149		return;
150
151	if (data->reset_needs_clk) {
152		reset_data->clk = of_clk_get(node, 0);
153		if (IS_ERR(reset_data->clk)) {
154			pr_err("Could not get clock for reset controls\n");
155			kfree(reset_data);
156			return;
157		}
158	}
159
160	reset_data->reg = reg;
161	reset_data->lock = lock;
162	reset_data->rcdev.nr_resets = __fls(data->reset_mask) + 1;
163	reset_data->rcdev.ops = &sunxi_usb_reset_ops;
164	reset_data->rcdev.of_node = node;
165	reset_controller_register(&reset_data->rcdev);
166}
167
168static const struct usb_clk_data sun4i_a10_usb_clk_data __initconst = {
169	.clk_mask = BIT(8) | BIT(7) | BIT(6),
170	.reset_mask = BIT(2) | BIT(1) | BIT(0),
171};
172
173static DEFINE_SPINLOCK(sun4i_a10_usb_lock);
174
175static void __init sun4i_a10_usb_setup(struct device_node *node)
176{
177	sunxi_usb_clk_setup(node, &sun4i_a10_usb_clk_data, &sun4i_a10_usb_lock);
178}
179CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);
180
181static const struct usb_clk_data sun5i_a13_usb_clk_data __initconst = {
182	.clk_mask = BIT(8) | BIT(6),
183	.reset_mask = BIT(1) | BIT(0),
184};
185
186static void __init sun5i_a13_usb_setup(struct device_node *node)
187{
188	sunxi_usb_clk_setup(node, &sun5i_a13_usb_clk_data, &sun4i_a10_usb_lock);
189}
190CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);
191
192static const struct usb_clk_data sun6i_a31_usb_clk_data __initconst = {
193	.clk_mask = BIT(18) | BIT(17) | BIT(16) | BIT(10) | BIT(9) | BIT(8),
194	.reset_mask = BIT(2) | BIT(1) | BIT(0),
195};
196
197static void __init sun6i_a31_usb_setup(struct device_node *node)
198{
199	sunxi_usb_clk_setup(node, &sun6i_a31_usb_clk_data, &sun4i_a10_usb_lock);
200}
201CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);
202
203static const struct usb_clk_data sun8i_a23_usb_clk_data __initconst = {
204	.clk_mask = BIT(16) | BIT(11) | BIT(10) | BIT(9) | BIT(8),
205	.reset_mask = BIT(2) | BIT(1) | BIT(0),
206};
207
208static void __init sun8i_a23_usb_setup(struct device_node *node)
209{
210	sunxi_usb_clk_setup(node, &sun8i_a23_usb_clk_data, &sun4i_a10_usb_lock);
211}
212CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);
213
214static const struct usb_clk_data sun8i_h3_usb_clk_data __initconst = {
215	.clk_mask =  BIT(19) | BIT(18) | BIT(17) | BIT(16) |
216		     BIT(11) | BIT(10) | BIT(9) | BIT(8),
217	.reset_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
218};
219
220static void __init sun8i_h3_usb_setup(struct device_node *node)
221{
222	sunxi_usb_clk_setup(node, &sun8i_h3_usb_clk_data, &sun4i_a10_usb_lock);
223}
224CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);
225
226static const struct usb_clk_data sun9i_a80_usb_mod_data __initconst = {
227	.clk_mask = BIT(6) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
228	.reset_mask = BIT(19) | BIT(18) | BIT(17),
229	.reset_needs_clk = 1,
230};
231
232static DEFINE_SPINLOCK(a80_usb_mod_lock);
233
234static void __init sun9i_a80_usb_mod_setup(struct device_node *node)
235{
236	sunxi_usb_clk_setup(node, &sun9i_a80_usb_mod_data, &a80_usb_mod_lock);
237}
238CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);
239
240static const struct usb_clk_data sun9i_a80_usb_phy_data __initconst = {
241	.clk_mask = BIT(10) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
242	.reset_mask = BIT(21) | BIT(20) | BIT(19) | BIT(18) | BIT(17),
243	.reset_needs_clk = 1,
244};
245
246static DEFINE_SPINLOCK(a80_usb_phy_lock);
247
248static void __init sun9i_a80_usb_phy_setup(struct device_node *node)
249{
250	sunxi_usb_clk_setup(node, &sun9i_a80_usb_phy_data, &a80_usb_phy_lock);
251}
252CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);
253