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14#include <linux/device.h>
15#include <linux/err.h>
16#include <linux/interrupt.h>
17#include <linux/io.h>
18#include <linux/module.h>
19#include <linux/of_platform.h>
20#include <linux/platform_device.h>
21#include <linux/spinlock.h>
22#include <linux/bitfield.h>
23
24#include <media/rc-core.h>
25
26#define DRIVER_NAME "meson-ir"
27
28
29#define IR_DEC_LDR_ACTIVE 0x00
30#define IR_DEC_LDR_IDLE 0x04
31#define IR_DEC_LDR_REPEAT 0x08
32#define IR_DEC_BIT_0 0x0c
33#define IR_DEC_REG0 0x10
34#define IR_DEC_FRAME 0x14
35#define IR_DEC_STATUS 0x18
36#define IR_DEC_REG1 0x1c
37
38#define IR_DEC_REG2 0x20
39
40#define REG0_RATE_MASK GENMASK(11, 0)
41
42#define DECODE_MODE_NEC 0x0
43#define DECODE_MODE_RAW 0x2
44
45
46#define REG1_MODE_MASK GENMASK(8, 7)
47#define REG1_MODE_SHIFT 7
48
49
50#define REG2_MODE_MASK GENMASK(3, 0)
51#define REG2_MODE_SHIFT 0
52
53#define REG1_TIME_IV_MASK GENMASK(28, 16)
54
55#define REG1_IRQSEL_MASK GENMASK(3, 2)
56#define REG1_IRQSEL_NEC_MODE 0
57#define REG1_IRQSEL_RISE_FALL 1
58#define REG1_IRQSEL_FALL 2
59#define REG1_IRQSEL_RISE 3
60
61#define REG1_RESET BIT(0)
62#define REG1_ENABLE BIT(15)
63
64#define STATUS_IR_DEC_IN BIT(8)
65
66#define MESON_TRATE 10
67
68struct meson_ir {
69 void __iomem *reg;
70 struct rc_dev *rc;
71 spinlock_t lock;
72};
73
74static void meson_ir_set_mask(struct meson_ir *ir, unsigned int reg,
75 u32 mask, u32 value)
76{
77 u32 data;
78
79 data = readl(ir->reg + reg);
80 data &= ~mask;
81 data |= (value & mask);
82 writel(data, ir->reg + reg);
83}
84
85static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
86{
87 struct meson_ir *ir = dev_id;
88 u32 duration, status;
89 DEFINE_IR_RAW_EVENT(rawir);
90
91 spin_lock(&ir->lock);
92
93 duration = readl_relaxed(ir->reg + IR_DEC_REG1);
94 duration = FIELD_GET(REG1_TIME_IV_MASK, duration);
95 rawir.duration = US_TO_NS(duration * MESON_TRATE);
96
97 status = readl_relaxed(ir->reg + IR_DEC_STATUS);
98 rawir.pulse = !!(status & STATUS_IR_DEC_IN);
99
100 ir_raw_event_store(ir->rc, &rawir);
101 ir_raw_event_handle(ir->rc);
102
103 spin_unlock(&ir->lock);
104
105 return IRQ_HANDLED;
106}
107
108static int meson_ir_probe(struct platform_device *pdev)
109{
110 struct device *dev = &pdev->dev;
111 struct device_node *node = dev->of_node;
112 struct resource *res;
113 const char *map_name;
114 struct meson_ir *ir;
115 int irq, ret;
116
117 ir = devm_kzalloc(dev, sizeof(struct meson_ir), GFP_KERNEL);
118 if (!ir)
119 return -ENOMEM;
120
121 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
122 ir->reg = devm_ioremap_resource(dev, res);
123 if (IS_ERR(ir->reg)) {
124 dev_err(dev, "failed to map registers\n");
125 return PTR_ERR(ir->reg);
126 }
127
128 irq = platform_get_irq(pdev, 0);
129 if (irq < 0) {
130 dev_err(dev, "no irq resource\n");
131 return irq;
132 }
133
134 ir->rc = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
135 if (!ir->rc) {
136 dev_err(dev, "failed to allocate rc device\n");
137 return -ENOMEM;
138 }
139
140 ir->rc->priv = ir;
141 ir->rc->input_name = DRIVER_NAME;
142 ir->rc->input_phys = DRIVER_NAME "/input0";
143 ir->rc->input_id.bustype = BUS_HOST;
144 map_name = of_get_property(node, "linux,rc-map-name", NULL);
145 ir->rc->map_name = map_name ? map_name : RC_MAP_EMPTY;
146 ir->rc->allowed_protocols = RC_BIT_ALL_IR_DECODER;
147 ir->rc->rx_resolution = US_TO_NS(MESON_TRATE);
148 ir->rc->timeout = MS_TO_NS(200);
149 ir->rc->driver_name = DRIVER_NAME;
150
151 spin_lock_init(&ir->lock);
152 platform_set_drvdata(pdev, ir);
153
154 ret = devm_rc_register_device(dev, ir->rc);
155 if (ret) {
156 dev_err(dev, "failed to register rc device\n");
157 return ret;
158 }
159
160 ret = devm_request_irq(dev, irq, meson_ir_irq, 0, NULL, ir);
161 if (ret) {
162 dev_err(dev, "failed to request irq\n");
163 return ret;
164 }
165
166
167 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, REG1_RESET);
168 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_RESET, 0);
169
170
171 if (of_device_is_compatible(node, "amlogic,meson6-ir"))
172 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK,
173 FIELD_PREP(REG1_MODE_MASK, DECODE_MODE_RAW));
174 else
175 meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK,
176 FIELD_PREP(REG2_MODE_MASK, DECODE_MODE_RAW));
177
178
179 meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1);
180
181 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK,
182 FIELD_PREP(REG1_IRQSEL_MASK, REG1_IRQSEL_RISE_FALL));
183
184 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE);
185
186 dev_info(dev, "receiver initialized\n");
187
188 return 0;
189}
190
191static int meson_ir_remove(struct platform_device *pdev)
192{
193 struct meson_ir *ir = platform_get_drvdata(pdev);
194 unsigned long flags;
195
196
197 spin_lock_irqsave(&ir->lock, flags);
198 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, 0);
199 spin_unlock_irqrestore(&ir->lock, flags);
200
201 return 0;
202}
203
204static void meson_ir_shutdown(struct platform_device *pdev)
205{
206 struct device *dev = &pdev->dev;
207 struct device_node *node = dev->of_node;
208 struct meson_ir *ir = platform_get_drvdata(pdev);
209 unsigned long flags;
210
211 spin_lock_irqsave(&ir->lock, flags);
212
213
214
215
216
217 if (of_device_is_compatible(node, "amlogic,meson6-ir"))
218 meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK,
219 DECODE_MODE_NEC << REG1_MODE_SHIFT);
220 else
221 meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK,
222 DECODE_MODE_NEC << REG2_MODE_SHIFT);
223
224
225 meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, 0x13);
226
227 spin_unlock_irqrestore(&ir->lock, flags);
228}
229
230static const struct of_device_id meson_ir_match[] = {
231 { .compatible = "amlogic,meson6-ir" },
232 { .compatible = "amlogic,meson8b-ir" },
233 { .compatible = "amlogic,meson-gxbb-ir" },
234 { },
235};
236MODULE_DEVICE_TABLE(of, meson_ir_match);
237
238static struct platform_driver meson_ir_driver = {
239 .probe = meson_ir_probe,
240 .remove = meson_ir_remove,
241 .shutdown = meson_ir_shutdown,
242 .driver = {
243 .name = DRIVER_NAME,
244 .of_match_table = meson_ir_match,
245 },
246};
247
248module_platform_driver(meson_ir_driver);
249
250MODULE_DESCRIPTION("Amlogic Meson IR remote receiver driver");
251MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
252MODULE_LICENSE("GPL v2");
253
