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