1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2014 Linaro Ltd.
4 * Copyright (c) 2014 Hisilicon Limited.
5 */
6
7 #include <linux/clk.h>
8 #include <linux/delay.h>
9 #include <linux/interrupt.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/module.h>
12 #include <linux/of_device.h>
13 #include <linux/regmap.h>
14 #include <media/rc-core.h>
15
16 #define IR_ENABLE 0x00
17 #define IR_CONFIG 0x04
18 #define CNT_LEADS 0x08
19 #define CNT_LEADE 0x0c
20 #define CNT_SLEADE 0x10
21 #define CNT0_B 0x14
22 #define CNT1_B 0x18
23 #define IR_BUSY 0x1c
24 #define IR_DATAH 0x20
25 #define IR_DATAL 0x24
26 #define IR_INTM 0x28
27 #define IR_INTS 0x2c
28 #define IR_INTC 0x30
29 #define IR_START 0x34
30
31 /* interrupt mask */
32 #define INTMS_SYMBRCV (BIT(24) | BIT(8))
33 #define INTMS_TIMEOUT (BIT(25) | BIT(9))
34 #define INTMS_OVERFLOW (BIT(26) | BIT(10))
35 #define INT_CLR_OVERFLOW BIT(18)
36 #define INT_CLR_TIMEOUT BIT(17)
37 #define INT_CLR_RCV BIT(16)
38 #define INT_CLR_RCVTIMEOUT (BIT(16) | BIT(17))
39
40 #define IR_CLK_ENABLE BIT(4)
41 #define IR_CLK_RESET BIT(5)
42
43 /* IR_ENABLE register bits */
44 #define IR_ENABLE_EN BIT(0)
45 #define IR_ENABLE_EN_EXTRA BIT(8)
46
47 #define IR_CFG_WIDTH_MASK 0xffff
48 #define IR_CFG_WIDTH_SHIFT 16
49 #define IR_CFG_FORMAT_MASK 0x3
50 #define IR_CFG_FORMAT_SHIFT 14
51 #define IR_CFG_INT_LEVEL_MASK 0x3f
52 #define IR_CFG_INT_LEVEL_SHIFT 8
53 /* only support raw mode */
54 #define IR_CFG_MODE_RAW BIT(7)
55 #define IR_CFG_FREQ_MASK 0x7f
56 #define IR_CFG_FREQ_SHIFT 0
57 #define IR_CFG_INT_THRESHOLD 1
58 /* symbol start from low to high, symbol stream end at high*/
59 #define IR_CFG_SYMBOL_FMT 0
60 #define IR_CFG_SYMBOL_MAXWIDTH 0x3e80
61
62 #define IR_HIX5HD2_NAME "hix5hd2-ir"
63
64 /* Need to set extra bit for enabling IR */
65 #define HIX5HD2_FLAG_EXTRA_ENABLE BIT(0)
66
67 struct hix5hd2_soc_data {
68 u32 clk_reg;
69 u32 flags;
70 };
71
72 static const struct hix5hd2_soc_data hix5hd2_data = {
73 .clk_reg = 0x48,
74 };
75
76 static const struct hix5hd2_soc_data hi3796cv300_data = {
77 .clk_reg = 0x60,
78 .flags = HIX5HD2_FLAG_EXTRA_ENABLE,
79 };
80
81 struct hix5hd2_ir_priv {
82 int irq;
83 void __iomem *base;
84 struct device *dev;
85 struct rc_dev *rdev;
86 struct regmap *regmap;
87 struct clk *clock;
88 unsigned long rate;
89 const struct hix5hd2_soc_data *socdata;
90 };
91
hix5hd2_ir_clk_enable(struct hix5hd2_ir_priv * dev,bool on)92 static int hix5hd2_ir_clk_enable(struct hix5hd2_ir_priv *dev, bool on)
93 {
94 u32 clk_reg = dev->socdata->clk_reg;
95 u32 val;
96 int ret = 0;
97
98 if (dev->regmap) {
99 regmap_read(dev->regmap, clk_reg, &val);
100 if (on) {
101 val &= ~IR_CLK_RESET;
102 val |= IR_CLK_ENABLE;
103 } else {
104 val &= ~IR_CLK_ENABLE;
105 val |= IR_CLK_RESET;
106 }
107 regmap_write(dev->regmap, clk_reg, val);
108 } else {
109 if (on)
110 ret = clk_prepare_enable(dev->clock);
111 else
112 clk_disable_unprepare(dev->clock);
113 }
114 return ret;
115 }
116
hix5hd2_ir_enable(struct hix5hd2_ir_priv * priv)117 static inline void hix5hd2_ir_enable(struct hix5hd2_ir_priv *priv)
118 {
119 u32 val = IR_ENABLE_EN;
120
121 if (priv->socdata->flags & HIX5HD2_FLAG_EXTRA_ENABLE)
122 val |= IR_ENABLE_EN_EXTRA;
123
124 writel_relaxed(val, priv->base + IR_ENABLE);
125 }
126
hix5hd2_ir_config(struct hix5hd2_ir_priv * priv)127 static int hix5hd2_ir_config(struct hix5hd2_ir_priv *priv)
128 {
129 int timeout = 10000;
130 u32 val, rate;
131
132 hix5hd2_ir_enable(priv);
133
134 while (readl_relaxed(priv->base + IR_BUSY)) {
135 if (timeout--) {
136 udelay(1);
137 } else {
138 dev_err(priv->dev, "IR_BUSY timeout\n");
139 return -ETIMEDOUT;
140 }
141 }
142
143 /* Now only support raw mode, with symbol start from low to high */
144 rate = DIV_ROUND_CLOSEST(priv->rate, 1000000);
145 val = IR_CFG_SYMBOL_MAXWIDTH & IR_CFG_WIDTH_MASK << IR_CFG_WIDTH_SHIFT;
146 val |= IR_CFG_SYMBOL_FMT & IR_CFG_FORMAT_MASK << IR_CFG_FORMAT_SHIFT;
147 val |= (IR_CFG_INT_THRESHOLD - 1) & IR_CFG_INT_LEVEL_MASK
148 << IR_CFG_INT_LEVEL_SHIFT;
149 val |= IR_CFG_MODE_RAW;
150 val |= (rate - 1) & IR_CFG_FREQ_MASK << IR_CFG_FREQ_SHIFT;
151 writel_relaxed(val, priv->base + IR_CONFIG);
152
153 writel_relaxed(0x00, priv->base + IR_INTM);
154 /* write arbitrary value to start */
155 writel_relaxed(0x01, priv->base + IR_START);
156 return 0;
157 }
158
hix5hd2_ir_open(struct rc_dev * rdev)159 static int hix5hd2_ir_open(struct rc_dev *rdev)
160 {
161 struct hix5hd2_ir_priv *priv = rdev->priv;
162 int ret;
163
164 ret = hix5hd2_ir_clk_enable(priv, true);
165 if (ret)
166 return ret;
167
168 ret = hix5hd2_ir_config(priv);
169 if (ret) {
170 hix5hd2_ir_clk_enable(priv, false);
171 return ret;
172 }
173 return 0;
174 }
175
hix5hd2_ir_close(struct rc_dev * rdev)176 static void hix5hd2_ir_close(struct rc_dev *rdev)
177 {
178 struct hix5hd2_ir_priv *priv = rdev->priv;
179
180 hix5hd2_ir_clk_enable(priv, false);
181 }
182
hix5hd2_ir_rx_interrupt(int irq,void * data)183 static irqreturn_t hix5hd2_ir_rx_interrupt(int irq, void *data)
184 {
185 u32 symb_num, symb_val, symb_time;
186 u32 data_l, data_h;
187 u32 irq_sr, i;
188 struct hix5hd2_ir_priv *priv = data;
189
190 irq_sr = readl_relaxed(priv->base + IR_INTS);
191 if (irq_sr & INTMS_OVERFLOW) {
192 /*
193 * we must read IR_DATAL first, then we can clean up
194 * IR_INTS availably since logic would not clear
195 * fifo when overflow, drv do the job
196 */
197 ir_raw_event_reset(priv->rdev);
198 symb_num = readl_relaxed(priv->base + IR_DATAH);
199 for (i = 0; i < symb_num; i++)
200 readl_relaxed(priv->base + IR_DATAL);
201
202 writel_relaxed(INT_CLR_OVERFLOW, priv->base + IR_INTC);
203 dev_info(priv->dev, "overflow, level=%d\n",
204 IR_CFG_INT_THRESHOLD);
205 }
206
207 if ((irq_sr & INTMS_SYMBRCV) || (irq_sr & INTMS_TIMEOUT)) {
208 struct ir_raw_event ev = {};
209
210 symb_num = readl_relaxed(priv->base + IR_DATAH);
211 for (i = 0; i < symb_num; i++) {
212 symb_val = readl_relaxed(priv->base + IR_DATAL);
213 data_l = ((symb_val & 0xffff) * 10);
214 data_h = ((symb_val >> 16) & 0xffff) * 10;
215 symb_time = (data_l + data_h) / 10;
216
217 ev.duration = data_l;
218 ev.pulse = true;
219 ir_raw_event_store(priv->rdev, &ev);
220
221 if (symb_time < IR_CFG_SYMBOL_MAXWIDTH) {
222 ev.duration = data_h;
223 ev.pulse = false;
224 ir_raw_event_store(priv->rdev, &ev);
225 } else {
226 ir_raw_event_set_idle(priv->rdev, true);
227 }
228 }
229
230 if (irq_sr & INTMS_SYMBRCV)
231 writel_relaxed(INT_CLR_RCV, priv->base + IR_INTC);
232 if (irq_sr & INTMS_TIMEOUT)
233 writel_relaxed(INT_CLR_TIMEOUT, priv->base + IR_INTC);
234 }
235
236 /* Empty software fifo */
237 ir_raw_event_handle(priv->rdev);
238 return IRQ_HANDLED;
239 }
240
241 static const struct of_device_id hix5hd2_ir_table[] = {
242 { .compatible = "hisilicon,hix5hd2-ir", &hix5hd2_data, },
243 { .compatible = "hisilicon,hi3796cv300-ir", &hi3796cv300_data, },
244 {},
245 };
246 MODULE_DEVICE_TABLE(of, hix5hd2_ir_table);
247
hix5hd2_ir_probe(struct platform_device * pdev)248 static int hix5hd2_ir_probe(struct platform_device *pdev)
249 {
250 struct rc_dev *rdev;
251 struct device *dev = &pdev->dev;
252 struct resource *res;
253 struct hix5hd2_ir_priv *priv;
254 struct device_node *node = pdev->dev.of_node;
255 const struct of_device_id *of_id;
256 const char *map_name;
257 int ret;
258
259 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
260 if (!priv)
261 return -ENOMEM;
262
263 of_id = of_match_device(hix5hd2_ir_table, dev);
264 if (!of_id) {
265 dev_err(dev, "Unable to initialize IR data\n");
266 return -ENODEV;
267 }
268 priv->socdata = of_id->data;
269
270 priv->regmap = syscon_regmap_lookup_by_phandle(node,
271 "hisilicon,power-syscon");
272 if (IS_ERR(priv->regmap)) {
273 dev_info(dev, "no power-reg\n");
274 priv->regmap = NULL;
275 }
276
277 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
278 priv->base = devm_ioremap_resource(dev, res);
279 if (IS_ERR(priv->base))
280 return PTR_ERR(priv->base);
281
282 priv->irq = platform_get_irq(pdev, 0);
283 if (priv->irq < 0)
284 return priv->irq;
285
286 rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
287 if (!rdev)
288 return -ENOMEM;
289
290 priv->clock = devm_clk_get(dev, NULL);
291 if (IS_ERR(priv->clock)) {
292 dev_err(dev, "clock not found\n");
293 ret = PTR_ERR(priv->clock);
294 goto err;
295 }
296 ret = clk_prepare_enable(priv->clock);
297 if (ret)
298 goto err;
299 priv->rate = clk_get_rate(priv->clock);
300
301 rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
302 rdev->priv = priv;
303 rdev->open = hix5hd2_ir_open;
304 rdev->close = hix5hd2_ir_close;
305 rdev->driver_name = IR_HIX5HD2_NAME;
306 map_name = of_get_property(node, "linux,rc-map-name", NULL);
307 rdev->map_name = map_name ?: RC_MAP_EMPTY;
308 rdev->device_name = IR_HIX5HD2_NAME;
309 rdev->input_phys = IR_HIX5HD2_NAME "/input0";
310 rdev->input_id.bustype = BUS_HOST;
311 rdev->input_id.vendor = 0x0001;
312 rdev->input_id.product = 0x0001;
313 rdev->input_id.version = 0x0100;
314 rdev->rx_resolution = 10;
315 rdev->timeout = IR_CFG_SYMBOL_MAXWIDTH * 10;
316
317 ret = rc_register_device(rdev);
318 if (ret < 0)
319 goto clkerr;
320
321 if (devm_request_irq(dev, priv->irq, hix5hd2_ir_rx_interrupt,
322 0, pdev->name, priv) < 0) {
323 dev_err(dev, "IRQ %d register failed\n", priv->irq);
324 ret = -EINVAL;
325 goto regerr;
326 }
327
328 priv->rdev = rdev;
329 priv->dev = dev;
330 platform_set_drvdata(pdev, priv);
331
332 return ret;
333
334 regerr:
335 rc_unregister_device(rdev);
336 rdev = NULL;
337 clkerr:
338 clk_disable_unprepare(priv->clock);
339 err:
340 rc_free_device(rdev);
341 dev_err(dev, "Unable to register device (%d)\n", ret);
342 return ret;
343 }
344
hix5hd2_ir_remove(struct platform_device * pdev)345 static int hix5hd2_ir_remove(struct platform_device *pdev)
346 {
347 struct hix5hd2_ir_priv *priv = platform_get_drvdata(pdev);
348
349 clk_disable_unprepare(priv->clock);
350 rc_unregister_device(priv->rdev);
351 return 0;
352 }
353
354 #ifdef CONFIG_PM_SLEEP
hix5hd2_ir_suspend(struct device * dev)355 static int hix5hd2_ir_suspend(struct device *dev)
356 {
357 struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev);
358
359 clk_disable_unprepare(priv->clock);
360 hix5hd2_ir_clk_enable(priv, false);
361
362 return 0;
363 }
364
hix5hd2_ir_resume(struct device * dev)365 static int hix5hd2_ir_resume(struct device *dev)
366 {
367 struct hix5hd2_ir_priv *priv = dev_get_drvdata(dev);
368 int ret;
369
370 ret = hix5hd2_ir_clk_enable(priv, true);
371 if (ret)
372 return ret;
373
374 ret = clk_prepare_enable(priv->clock);
375 if (ret) {
376 hix5hd2_ir_clk_enable(priv, false);
377 return ret;
378 }
379
380 hix5hd2_ir_enable(priv);
381
382 writel_relaxed(0x00, priv->base + IR_INTM);
383 writel_relaxed(0xff, priv->base + IR_INTC);
384 writel_relaxed(0x01, priv->base + IR_START);
385
386 return 0;
387 }
388 #endif
389
390 static SIMPLE_DEV_PM_OPS(hix5hd2_ir_pm_ops, hix5hd2_ir_suspend,
391 hix5hd2_ir_resume);
392
393 static struct platform_driver hix5hd2_ir_driver = {
394 .driver = {
395 .name = IR_HIX5HD2_NAME,
396 .of_match_table = hix5hd2_ir_table,
397 .pm = &hix5hd2_ir_pm_ops,
398 },
399 .probe = hix5hd2_ir_probe,
400 .remove = hix5hd2_ir_remove,
401 };
402
403 module_platform_driver(hix5hd2_ir_driver);
404
405 MODULE_DESCRIPTION("IR controller driver for hix5hd2 platforms");
406 MODULE_AUTHOR("Guoxiong Yan <yanguoxiong@huawei.com>");
407 MODULE_LICENSE("GPL v2");
408 MODULE_ALIAS("platform:hix5hd2-ir");
409
