1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2013-2015 Emilio López
4 *
5 * Emilio López <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(clk: data->clk);
39 spin_lock_irqsave(data->lock, flags);
40
41 reg = readl(addr: data->reg);
42 writel(val: reg & ~BIT(id), addr: data->reg);
43
44 spin_unlock_irqrestore(lock: data->lock, flags);
45 clk_disable_unprepare(clk: 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(clk: data->clk);
60 spin_lock_irqsave(data->lock, flags);
61
62 reg = readl(addr: data->reg);
63 writel(val: reg | BIT(id), addr: data->reg);
64
65 spin_unlock_irqrestore(lock: data->lock, flags);
66 clk_disable_unprepare(clk: 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(device: node, index: 0, name: of_node_full_name(np: node));
105 if (IS_ERR(ptr: reg))
106 return;
107
108 clk_parent = of_clk_get_parent_name(np: node, index: 0);
109 if (!clk_parent)
110 return;
111
112 /* Worst-case size approximation and memory allocation */
113 qty = find_last_bit(addr: (unsigned long *)&data->clk_mask,
114 SUNXI_USB_MAX_SIZE);
115
116 clk_data = kmalloc(size: sizeof(struct clk_onecell_data), GFP_KERNEL);
117 if (!clk_data)
118 return;
119
120 clk_data->clks = kcalloc(n: qty + 1, size: sizeof(struct clk *), GFP_KERNEL);
121 if (!clk_data->clks) {
122 kfree(objp: 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(np: node, propname: "clock-output-names",
129 index: j, output: &clk_name);
130 clk_data->clks[i] = clk_register_gate(NULL, name: clk_name,
131 parent_name: clk_parent, flags: 0,
132 reg, bit_idx: i, clk_gate_flags: 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(np: node, clk_src_get: of_clk_src_onecell_get, data: 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(size: 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(np: node, index: 0);
153 if (IS_ERR(ptr: reset_data->clk)) {
154 pr_err("Could not get clock for reset controls\n");
155 kfree(objp: reset_data);
156 return;
157 }
158 }
159
160 reset_data->reg = reg;
161 reset_data->lock = lock;
162 reset_data->rcdev.nr_resets = __fls(word: data->reset_mask) + 1;
163 reset_data->rcdev.ops = &sunxi_usb_reset_ops;
164 reset_data->rcdev.of_node = node;
165 reset_controller_register(rcdev: &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, data: &sun4i_a10_usb_clk_data, lock: &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, data: &sun5i_a13_usb_clk_data, lock: &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, data: &sun6i_a31_usb_clk_data, lock: &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, data: &sun8i_a23_usb_clk_data, lock: &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, data: &sun8i_h3_usb_clk_data, lock: &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, data: &sun9i_a80_usb_mod_data, lock: &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, data: &sun9i_a80_usb_phy_data, lock: &a80_usb_phy_lock);
251}
252CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);
253

source code of linux/drivers/clk/sunxi/clk-usb.c