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 * sunxi_usb_clk_setup() - Setup function for usb gate clocks
78 */
79
80 #define SUNXI_USB_MAX_SIZE 32
81
82 struct usb_clk_data {
83 u32 clk_mask;
84 u32 reset_mask;
85 bool reset_needs_clk;
86 };
87
sunxi_usb_clk_setup(struct device_node * node,const struct usb_clk_data * data,spinlock_t * lock)88 static void __init sunxi_usb_clk_setup(struct device_node *node,
89 const struct usb_clk_data *data,
90 spinlock_t *lock)
91 {
92 struct clk_onecell_data *clk_data;
93 struct usb_reset_data *reset_data;
94 const char *clk_parent;
95 const char *clk_name;
96 void __iomem *reg;
97 int qty;
98 int i = 0;
99 int j = 0;
100
101 reg = of_io_request_and_map(node, 0, of_node_full_name(node));
102 if (IS_ERR(reg))
103 return;
104
105 clk_parent = of_clk_get_parent_name(node, 0);
106 if (!clk_parent)
107 return;
108
109 /* Worst-case size approximation and memory allocation */
110 qty = find_last_bit((unsigned long *)&data->clk_mask,
111 SUNXI_USB_MAX_SIZE);
112
113 clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
114 if (!clk_data)
115 return;
116
117 clk_data->clks = kcalloc(qty + 1, sizeof(struct clk *), GFP_KERNEL);
118 if (!clk_data->clks) {
119 kfree(clk_data);
120 return;
121 }
122
123 for_each_set_bit(i, (unsigned long *)&data->clk_mask,
124 SUNXI_USB_MAX_SIZE) {
125 of_property_read_string_index(node, "clock-output-names",
126 j, &clk_name);
127 clk_data->clks[i] = clk_register_gate(NULL, clk_name,
128 clk_parent, 0,
129 reg, i, 0, lock);
130 WARN_ON(IS_ERR(clk_data->clks[i]));
131
132 j++;
133 }
134
135 /* Adjust to the real max */
136 clk_data->clk_num = i;
137
138 of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
139
140 /* Register a reset controller for usb with reset bits */
141 if (data->reset_mask == 0)
142 return;
143
144 reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
145 if (!reset_data)
146 return;
147
148 if (data->reset_needs_clk) {
149 reset_data->clk = of_clk_get(node, 0);
150 if (IS_ERR(reset_data->clk)) {
151 pr_err("Could not get clock for reset controls\n");
152 kfree(reset_data);
153 return;
154 }
155 }
156
157 reset_data->reg = reg;
158 reset_data->lock = lock;
159 reset_data->rcdev.nr_resets = __fls(data->reset_mask) + 1;
160 reset_data->rcdev.ops = &sunxi_usb_reset_ops;
161 reset_data->rcdev.of_node = node;
162 reset_controller_register(&reset_data->rcdev);
163 }
164
165 static const struct usb_clk_data sun4i_a10_usb_clk_data __initconst = {
166 .clk_mask = BIT(8) | BIT(7) | BIT(6),
167 .reset_mask = BIT(2) | BIT(1) | BIT(0),
168 };
169
170 static DEFINE_SPINLOCK(sun4i_a10_usb_lock);
171
sun4i_a10_usb_setup(struct device_node * node)172 static void __init sun4i_a10_usb_setup(struct device_node *node)
173 {
174 sunxi_usb_clk_setup(node, &sun4i_a10_usb_clk_data, &sun4i_a10_usb_lock);
175 }
176 CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);
177
178 static const struct usb_clk_data sun5i_a13_usb_clk_data __initconst = {
179 .clk_mask = BIT(8) | BIT(6),
180 .reset_mask = BIT(1) | BIT(0),
181 };
182
sun5i_a13_usb_setup(struct device_node * node)183 static void __init sun5i_a13_usb_setup(struct device_node *node)
184 {
185 sunxi_usb_clk_setup(node, &sun5i_a13_usb_clk_data, &sun4i_a10_usb_lock);
186 }
187 CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);
188
189 static const struct usb_clk_data sun6i_a31_usb_clk_data __initconst = {
190 .clk_mask = BIT(18) | BIT(17) | BIT(16) | BIT(10) | BIT(9) | BIT(8),
191 .reset_mask = BIT(2) | BIT(1) | BIT(0),
192 };
193
sun6i_a31_usb_setup(struct device_node * node)194 static void __init sun6i_a31_usb_setup(struct device_node *node)
195 {
196 sunxi_usb_clk_setup(node, &sun6i_a31_usb_clk_data, &sun4i_a10_usb_lock);
197 }
198 CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);
199
200 static const struct usb_clk_data sun8i_a23_usb_clk_data __initconst = {
201 .clk_mask = BIT(16) | BIT(11) | BIT(10) | BIT(9) | BIT(8),
202 .reset_mask = BIT(2) | BIT(1) | BIT(0),
203 };
204
sun8i_a23_usb_setup(struct device_node * node)205 static void __init sun8i_a23_usb_setup(struct device_node *node)
206 {
207 sunxi_usb_clk_setup(node, &sun8i_a23_usb_clk_data, &sun4i_a10_usb_lock);
208 }
209 CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);
210
211 static const struct usb_clk_data sun8i_h3_usb_clk_data __initconst = {
212 .clk_mask = BIT(19) | BIT(18) | BIT(17) | BIT(16) |
213 BIT(11) | BIT(10) | BIT(9) | BIT(8),
214 .reset_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
215 };
216
sun8i_h3_usb_setup(struct device_node * node)217 static void __init sun8i_h3_usb_setup(struct device_node *node)
218 {
219 sunxi_usb_clk_setup(node, &sun8i_h3_usb_clk_data, &sun4i_a10_usb_lock);
220 }
221 CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);
222
223 static const struct usb_clk_data sun9i_a80_usb_mod_data __initconst = {
224 .clk_mask = BIT(6) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
225 .reset_mask = BIT(19) | BIT(18) | BIT(17),
226 .reset_needs_clk = 1,
227 };
228
229 static DEFINE_SPINLOCK(a80_usb_mod_lock);
230
sun9i_a80_usb_mod_setup(struct device_node * node)231 static void __init sun9i_a80_usb_mod_setup(struct device_node *node)
232 {
233 sunxi_usb_clk_setup(node, &sun9i_a80_usb_mod_data, &a80_usb_mod_lock);
234 }
235 CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);
236
237 static const struct usb_clk_data sun9i_a80_usb_phy_data __initconst = {
238 .clk_mask = BIT(10) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
239 .reset_mask = BIT(21) | BIT(20) | BIT(19) | BIT(18) | BIT(17),
240 .reset_needs_clk = 1,
241 };
242
243 static DEFINE_SPINLOCK(a80_usb_phy_lock);
244
sun9i_a80_usb_phy_setup(struct device_node * node)245 static void __init sun9i_a80_usb_phy_setup(struct device_node *node)
246 {
247 sunxi_usb_clk_setup(node, &sun9i_a80_usb_phy_data, &a80_usb_phy_lock);
248 }
249 CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);
250