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
22 struct usb_reset_data {
23 void __iomem *reg;
24 spinlock_t *lock;
25 struct clk *clk;
26 struct reset_controller_dev rcdev;
27 };
28
sunxi_usb_reset_assert(struct reset_controller_dev * rcdev,unsigned long id)29 static 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
sunxi_usb_reset_deassert(struct reset_controller_dev * rcdev,unsigned long id)50 static 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
71 static 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
79 struct 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 */
sunxi_usb_clk_setup(struct device_node * node,const struct usb_clk_data * data,spinlock_t * lock)91 static 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
168 static 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
173 static DEFINE_SPINLOCK(sun4i_a10_usb_lock);
174
sun4i_a10_usb_setup(struct device_node * node)175 static 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 }
179 CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);
180
181 static 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
sun5i_a13_usb_setup(struct device_node * node)186 static 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 }
190 CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);
191
192 static 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
sun6i_a31_usb_setup(struct device_node * node)197 static 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 }
201 CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);
202
203 static 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
sun8i_a23_usb_setup(struct device_node * node)208 static 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 }
212 CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);
213
214 static 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
sun8i_h3_usb_setup(struct device_node * node)220 static 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 }
224 CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);
225
226 static 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
232 static DEFINE_SPINLOCK(a80_usb_mod_lock);
233
sun9i_a80_usb_mod_setup(struct device_node * node)234 static 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 }
238 CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);
239
240 static 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
246 static DEFINE_SPINLOCK(a80_usb_phy_lock);
247
sun9i_a80_usb_phy_setup(struct device_node * node)248 static 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 }
252 CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);
253