1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
From 3cdd9f5c4953465abb87ec757159cc0576ae6b0a Mon Sep 17 00:00:00 2001
From: Chen-Yu Tsai <wens@csie.org>
Date: Sat, 5 Dec 2015 21:16:43 +0800
Subject: [PATCH] clk: sunxi: Add VE (Video Engine) module clock driver for
sun[457]i
The video engine has its own special module clock, consisting of a clock
gate, configurable dividers, and a reset control.
On later (sun[68]i) families, the reset control is moved out of this
piece of hardware and grouped with reset controls of other peripherals.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Tested-by: Jens Kuske <jenskuske@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
Documentation/devicetree/bindings/clock/sunxi.txt | 4 +
drivers/clk/sunxi/Makefile | 1 +
drivers/clk/sunxi/clk-a10-ve.c | 171 ++++++++++++++++++++++
3 files changed, 176 insertions(+)
create mode 100644 drivers/clk/sunxi/clk-a10-ve.c
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -73,6 +73,7 @@ Required properties:
"allwinner,sun8i-h3-usb-clk" - for usb gates + resets on H3
"allwinner,sun9i-a80-usb-mod-clk" - for usb gates + resets on A80
"allwinner,sun9i-a80-usb-phy-clk" - for usb phy gates + resets on A80
+ "allwinner,sun4i-a10-ve-clk" - for the Video Engine clock
Required properties for all clocks:
- reg : shall be the control register address for the clock.
@@ -92,6 +93,9 @@ Required properties for all clocks:
And "allwinner,*-usb-clk" clocks also require:
- reset-cells : shall be set to 1
+The "allwinner,sun4i-a10-ve-clk" clock also requires:
+- reset-cells : shall be set to 0
+
The "allwinner,sun9i-a80-mmc-config-clk" clock also requires:
- #reset-cells : shall be set to 1
- resets : shall be the reset control phandle for the mmc block.
--- a/drivers/clk/sunxi/Makefile
+++ b/drivers/clk/sunxi/Makefile
@@ -7,6 +7,7 @@ obj-y += clk-a10-codec.o
obj-y += clk-a10-hosc.o
obj-y += clk-a10-mod1.o
obj-y += clk-a10-pll2.o
+obj-y += clk-a10-ve.o
obj-y += clk-a20-gmac.o
obj-y += clk-mod0.o
obj-y += clk-simple-gates.o
--- /dev/null
+++ b/drivers/clk/sunxi/clk-a10-ve.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright 2015 Chen-Yu Tsai
+ *
+ * Chen-Yu Tsai <wens@csie.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+static DEFINE_SPINLOCK(ve_lock);
+
+#define SUN4I_VE_ENABLE 31
+#define SUN4I_VE_DIVIDER_SHIFT 16
+#define SUN4I_VE_DIVIDER_WIDTH 3
+#define SUN4I_VE_RESET 0
+
+/**
+ * sunxi_ve_reset... - reset bit in ve clk registers handling
+ */
+
+struct ve_reset_data {
+ void __iomem *reg;
+ spinlock_t *lock;
+ struct reset_controller_dev rcdev;
+};
+
+static int sunxi_ve_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct ve_reset_data *data = container_of(rcdev,
+ struct ve_reset_data,
+ rcdev);
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(data->lock, flags);
+
+ reg = readl(data->reg);
+ writel(reg & ~BIT(SUN4I_VE_RESET), data->reg);
+
+ spin_unlock_irqrestore(data->lock, flags);
+
+ return 0;
+}
+
+static int sunxi_ve_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct ve_reset_data *data = container_of(rcdev,
+ struct ve_reset_data,
+ rcdev);
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(data->lock, flags);
+
+ reg = readl(data->reg);
+ writel(reg | BIT(SUN4I_VE_RESET), data->reg);
+
+ spin_unlock_irqrestore(data->lock, flags);
+
+ return 0;
+}
+
+static int sunxi_ve_of_xlate(struct reset_controller_dev *rcdev,
+ const struct of_phandle_args *reset_spec)
+{
+ if (WARN_ON(reset_spec->args_count != 0))
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct reset_control_ops sunxi_ve_reset_ops = {
+ .assert = sunxi_ve_reset_assert,
+ .deassert = sunxi_ve_reset_deassert,
+};
+
+static void __init sun4i_ve_clk_setup(struct device_node *node)
+{
+ struct clk *clk;
+ struct clk_divider *div;
+ struct clk_gate *gate;
+ struct ve_reset_data *reset_data;
+ const char *parent;
+ const char *clk_name = node->name;
+ void __iomem *reg;
+ int err;
+
+ reg = of_io_request_and_map(node, 0, of_node_full_name(node));
+ if (IS_ERR(reg))
+ return;
+
+ div = kzalloc(sizeof(*div), GFP_KERNEL);
+ if (!div)
+ goto err_unmap;
+
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ goto err_free_div;
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+ parent = of_clk_get_parent_name(node, 0);
+
+ gate->reg = reg;
+ gate->bit_idx = SUN4I_VE_ENABLE;
+ gate->lock = &ve_lock;
+
+ div->reg = reg;
+ div->shift = SUN4I_VE_DIVIDER_SHIFT;
+ div->width = SUN4I_VE_DIVIDER_WIDTH;
+ div->lock = &ve_lock;
+
+ clk = clk_register_composite(NULL, clk_name, &parent, 1,
+ NULL, NULL,
+ &div->hw, &clk_divider_ops,
+ &gate->hw, &clk_gate_ops,
+ CLK_SET_RATE_PARENT);
+ if (IS_ERR(clk))
+ goto err_free_gate;
+
+ err = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ if (err)
+ goto err_unregister_clk;
+
+ reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
+ if (!reset_data)
+ goto err_del_provider;
+
+ reset_data->reg = reg;
+ reset_data->lock = &ve_lock;
+ reset_data->rcdev.nr_resets = 1;
+ reset_data->rcdev.ops = &sunxi_ve_reset_ops;
+ reset_data->rcdev.of_node = node;
+ reset_data->rcdev.of_xlate = sunxi_ve_of_xlate;
+ reset_data->rcdev.of_reset_n_cells = 0;
+ err = reset_controller_register(&reset_data->rcdev);
+ if (err)
+ goto err_free_reset;
+
+ return;
+
+err_free_reset:
+ kfree(reset_data);
+err_del_provider:
+ of_clk_del_provider(node);
+err_unregister_clk:
+ clk_unregister(clk);
+err_free_gate:
+ kfree(gate);
+err_free_div:
+ kfree(div);
+err_unmap:
+ iounmap(reg);
+}
+CLK_OF_DECLARE(sun4i_ve, "allwinner,sun4i-a10-ve-clk",
+ sun4i_ve_clk_setup);
|
