1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for Allwinner sunXi IR controller 4 * 5 * Copyright (C) 2014 Alexsey Shestacov <wingrime@linux-sunxi.org> 6 * Copyright (C) 2014 Alexander Bersenev <bay@hackerdom.ru> 7 * 8 * Based on sun5i-ir.c: 9 * Copyright (C) 2007-2012 Daniel Wang 10 * Allwinner Technology Co., Ltd. <www.allwinnertech.com> 11 */ 12 13 #include <linux/clk.h> 14 #include <linux/interrupt.h> 15 #include <linux/io.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/platform_device.h> 19 #include <linux/reset.h> 20 #include <media/rc-core.h> 21 22 #define SUNXI_IR_DEV "sunxi-ir" 23 24 /* Registers */ 25 /* IR Control */ 26 #define SUNXI_IR_CTL_REG 0x00 27 /* Global Enable */ 28 #define REG_CTL_GEN BIT(0) 29 /* RX block enable */ 30 #define REG_CTL_RXEN BIT(1) 31 /* CIR mode */ 32 #define REG_CTL_MD (BIT(4) | BIT(5)) 33 34 /* Rx Config */ 35 #define SUNXI_IR_RXCTL_REG 0x10 36 /* Pulse Polarity Invert flag */ 37 #define REG_RXCTL_RPPI BIT(2) 38 39 /* Rx Data */ 40 #define SUNXI_IR_RXFIFO_REG 0x20 41 42 /* Rx Interrupt Enable */ 43 #define SUNXI_IR_RXINT_REG 0x2C 44 /* Rx FIFO Overflow Interrupt Enable */ 45 #define REG_RXINT_ROI_EN BIT(0) 46 /* Rx Packet End Interrupt Enable */ 47 #define REG_RXINT_RPEI_EN BIT(1) 48 /* Rx FIFO Data Available Interrupt Enable */ 49 #define REG_RXINT_RAI_EN BIT(4) 50 51 /* Rx FIFO available byte level */ 52 #define REG_RXINT_RAL(val) ((val) << 8) 53 54 /* Rx Interrupt Status */ 55 #define SUNXI_IR_RXSTA_REG 0x30 56 /* Rx FIFO Overflow */ 57 #define REG_RXSTA_ROI REG_RXINT_ROI_EN 58 /* Rx Packet End */ 59 #define REG_RXSTA_RPE REG_RXINT_RPEI_EN 60 /* Rx FIFO Data Available */ 61 #define REG_RXSTA_RA REG_RXINT_RAI_EN 62 /* RX FIFO Get Available Counter */ 63 #define REG_RXSTA_GET_AC(val) (((val) >> 8) & (ir->fifo_size * 2 - 1)) 64 /* Clear all interrupt status value */ 65 #define REG_RXSTA_CLEARALL 0xff 66 67 /* IR Sample Config */ 68 #define SUNXI_IR_CIR_REG 0x34 69 /* CIR_REG register noise threshold */ 70 #define REG_CIR_NTHR(val) (((val) << 2) & (GENMASK(7, 2))) 71 /* CIR_REG register idle threshold */ 72 #define REG_CIR_ITHR(val) (((val) << 8) & (GENMASK(15, 8))) 73 74 /* Required frequency for IR0 or IR1 clock in CIR mode (default) */ 75 #define SUNXI_IR_BASE_CLK 8000000 76 /* Noise threshold in samples */ 77 #define SUNXI_IR_RXNOISE 1 78 79 /** 80 * struct sunxi_ir_quirks - Differences between SoC variants. 81 * 82 * @has_reset: SoC needs reset deasserted. 83 * @fifo_size: size of the fifo. 84 */ 85 struct sunxi_ir_quirks { 86 bool has_reset; 87 int fifo_size; 88 }; 89 90 struct sunxi_ir { 91 struct rc_dev *rc; 92 void __iomem *base; 93 int irq; 94 int fifo_size; 95 struct clk *clk; 96 struct clk *apb_clk; 97 struct reset_control *rst; 98 const char *map_name; 99 }; 100 101 static irqreturn_t sunxi_ir_irq(int irqno, void *dev_id) 102 { 103 unsigned long status; 104 unsigned char dt; 105 unsigned int cnt, rc; 106 struct sunxi_ir *ir = dev_id; 107 struct ir_raw_event rawir = {}; 108 109 status = readl(ir->base + SUNXI_IR_RXSTA_REG); 110 111 /* clean all pending statuses */ 112 writel(status | REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG); 113 114 if (status & (REG_RXSTA_RA | REG_RXSTA_RPE)) { 115 /* How many messages in fifo */ 116 rc = REG_RXSTA_GET_AC(status); 117 /* Sanity check */ 118 rc = rc > ir->fifo_size ? ir->fifo_size : rc; 119 /* If we have data */ 120 for (cnt = 0; cnt < rc; cnt++) { 121 /* for each bit in fifo */ 122 dt = readb(ir->base + SUNXI_IR_RXFIFO_REG); 123 rawir.pulse = (dt & 0x80) != 0; 124 rawir.duration = ((dt & 0x7f) + 1) * 125 ir->rc->rx_resolution; 126 ir_raw_event_store_with_filter(ir->rc, &rawir); 127 } 128 } 129 130 if (status & REG_RXSTA_ROI) { 131 ir_raw_event_overflow(ir->rc); 132 } else if (status & REG_RXSTA_RPE) { 133 ir_raw_event_set_idle(ir->rc, true); 134 ir_raw_event_handle(ir->rc); 135 } else { 136 ir_raw_event_handle(ir->rc); 137 } 138 139 return IRQ_HANDLED; 140 } 141 142 /* Convert idle threshold to usec */ 143 static unsigned int sunxi_ithr_to_usec(unsigned int base_clk, unsigned int ithr) 144 { 145 return DIV_ROUND_CLOSEST(USEC_PER_SEC * (ithr + 1), 146 base_clk / (128 * 64)); 147 } 148 149 /* Convert usec to idle threshold */ 150 static unsigned int sunxi_usec_to_ithr(unsigned int base_clk, unsigned int usec) 151 { 152 /* make sure we don't end up with a timeout less than requested */ 153 return DIV_ROUND_UP((base_clk / (128 * 64)) * usec, USEC_PER_SEC) - 1; 154 } 155 156 static int sunxi_ir_set_timeout(struct rc_dev *rc_dev, unsigned int timeout) 157 { 158 struct sunxi_ir *ir = rc_dev->priv; 159 unsigned int base_clk = clk_get_rate(ir->clk); 160 161 unsigned int ithr = sunxi_usec_to_ithr(base_clk, timeout); 162 163 dev_dbg(rc_dev->dev.parent, "setting idle threshold to %u\n", ithr); 164 165 /* Set noise threshold and idle threshold */ 166 writel(REG_CIR_NTHR(SUNXI_IR_RXNOISE) | REG_CIR_ITHR(ithr), 167 ir->base + SUNXI_IR_CIR_REG); 168 169 rc_dev->timeout = sunxi_ithr_to_usec(base_clk, ithr); 170 171 return 0; 172 } 173 174 static int sunxi_ir_hw_init(struct device *dev) 175 { 176 struct sunxi_ir *ir = dev_get_drvdata(dev); 177 u32 tmp; 178 int ret; 179 180 ret = reset_control_deassert(ir->rst); 181 if (ret) 182 return ret; 183 184 ret = clk_prepare_enable(ir->apb_clk); 185 if (ret) { 186 dev_err(dev, "failed to enable apb clk\n"); 187 goto exit_assert_reset; 188 } 189 190 ret = clk_prepare_enable(ir->clk); 191 if (ret) { 192 dev_err(dev, "failed to enable ir clk\n"); 193 goto exit_disable_apb_clk; 194 } 195 196 /* Enable CIR Mode */ 197 writel(REG_CTL_MD, ir->base + SUNXI_IR_CTL_REG); 198 199 /* Set noise threshold and idle threshold */ 200 sunxi_ir_set_timeout(ir->rc, ir->rc->timeout); 201 202 /* Invert Input Signal */ 203 writel(REG_RXCTL_RPPI, ir->base + SUNXI_IR_RXCTL_REG); 204 205 /* Clear All Rx Interrupt Status */ 206 writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG); 207 208 /* 209 * Enable IRQ on overflow, packet end, FIFO available with trigger 210 * level 211 */ 212 writel(REG_RXINT_ROI_EN | REG_RXINT_RPEI_EN | 213 REG_RXINT_RAI_EN | REG_RXINT_RAL(ir->fifo_size / 2 - 1), 214 ir->base + SUNXI_IR_RXINT_REG); 215 216 /* Enable IR Module */ 217 tmp = readl(ir->base + SUNXI_IR_CTL_REG); 218 writel(tmp | REG_CTL_GEN | REG_CTL_RXEN, ir->base + SUNXI_IR_CTL_REG); 219 220 return 0; 221 222 exit_disable_apb_clk: 223 clk_disable_unprepare(ir->apb_clk); 224 exit_assert_reset: 225 reset_control_assert(ir->rst); 226 227 return ret; 228 } 229 230 static void sunxi_ir_hw_exit(struct device *dev) 231 { 232 struct sunxi_ir *ir = dev_get_drvdata(dev); 233 234 clk_disable_unprepare(ir->clk); 235 clk_disable_unprepare(ir->apb_clk); 236 reset_control_assert(ir->rst); 237 } 238 239 static int __maybe_unused sunxi_ir_suspend(struct device *dev) 240 { 241 sunxi_ir_hw_exit(dev); 242 243 return 0; 244 } 245 246 static int __maybe_unused sunxi_ir_resume(struct device *dev) 247 { 248 return sunxi_ir_hw_init(dev); 249 } 250 251 static SIMPLE_DEV_PM_OPS(sunxi_ir_pm_ops, sunxi_ir_suspend, sunxi_ir_resume); 252 253 static int sunxi_ir_probe(struct platform_device *pdev) 254 { 255 int ret = 0; 256 257 struct device *dev = &pdev->dev; 258 struct device_node *dn = dev->of_node; 259 const struct sunxi_ir_quirks *quirks; 260 struct sunxi_ir *ir; 261 u32 b_clk_freq = SUNXI_IR_BASE_CLK; 262 263 ir = devm_kzalloc(dev, sizeof(struct sunxi_ir), GFP_KERNEL); 264 if (!ir) 265 return -ENOMEM; 266 267 quirks = of_device_get_match_data(&pdev->dev); 268 if (!quirks) { 269 dev_err(&pdev->dev, "Failed to determine the quirks to use\n"); 270 return -ENODEV; 271 } 272 273 ir->fifo_size = quirks->fifo_size; 274 275 /* Clock */ 276 ir->apb_clk = devm_clk_get(dev, "apb"); 277 if (IS_ERR(ir->apb_clk)) { 278 dev_err(dev, "failed to get a apb clock.\n"); 279 return PTR_ERR(ir->apb_clk); 280 } 281 ir->clk = devm_clk_get(dev, "ir"); 282 if (IS_ERR(ir->clk)) { 283 dev_err(dev, "failed to get a ir clock.\n"); 284 return PTR_ERR(ir->clk); 285 } 286 287 /* Base clock frequency (optional) */ 288 of_property_read_u32(dn, "clock-frequency", &b_clk_freq); 289 290 /* Reset */ 291 if (quirks->has_reset) { 292 ir->rst = devm_reset_control_get_exclusive(dev, NULL); 293 if (IS_ERR(ir->rst)) 294 return PTR_ERR(ir->rst); 295 } 296 297 ret = clk_set_rate(ir->clk, b_clk_freq); 298 if (ret) { 299 dev_err(dev, "set ir base clock failed!\n"); 300 return ret; 301 } 302 dev_dbg(dev, "set base clock frequency to %d Hz.\n", b_clk_freq); 303 304 /* IO */ 305 ir->base = devm_platform_ioremap_resource(pdev, 0); 306 if (IS_ERR(ir->base)) { 307 return PTR_ERR(ir->base); 308 } 309 310 ir->rc = rc_allocate_device(RC_DRIVER_IR_RAW); 311 if (!ir->rc) { 312 dev_err(dev, "failed to allocate device\n"); 313 return -ENOMEM; 314 } 315 316 ir->rc->priv = ir; 317 ir->rc->device_name = SUNXI_IR_DEV; 318 ir->rc->input_phys = "sunxi-ir/input0"; 319 ir->rc->input_id.bustype = BUS_HOST; 320 ir->rc->input_id.vendor = 0x0001; 321 ir->rc->input_id.product = 0x0001; 322 ir->rc->input_id.version = 0x0100; 323 ir->map_name = of_get_property(dn, "linux,rc-map-name", NULL); 324 ir->rc->map_name = ir->map_name ?: RC_MAP_EMPTY; 325 ir->rc->dev.parent = dev; 326 ir->rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; 327 /* Frequency after IR internal divider with sample period in us */ 328 ir->rc->rx_resolution = (USEC_PER_SEC / (b_clk_freq / 64)); 329 ir->rc->timeout = IR_DEFAULT_TIMEOUT; 330 ir->rc->min_timeout = sunxi_ithr_to_usec(b_clk_freq, 0); 331 ir->rc->max_timeout = sunxi_ithr_to_usec(b_clk_freq, 255); 332 ir->rc->s_timeout = sunxi_ir_set_timeout; 333 ir->rc->driver_name = SUNXI_IR_DEV; 334 335 ret = rc_register_device(ir->rc); 336 if (ret) { 337 dev_err(dev, "failed to register rc device\n"); 338 goto exit_free_dev; 339 } 340 341 platform_set_drvdata(pdev, ir); 342 343 /* IRQ */ 344 ir->irq = platform_get_irq(pdev, 0); 345 if (ir->irq < 0) { 346 ret = ir->irq; 347 goto exit_free_dev; 348 } 349 350 ret = devm_request_irq(dev, ir->irq, sunxi_ir_irq, 0, SUNXI_IR_DEV, ir); 351 if (ret) { 352 dev_err(dev, "failed request irq\n"); 353 goto exit_free_dev; 354 } 355 356 ret = sunxi_ir_hw_init(dev); 357 if (ret) 358 goto exit_free_dev; 359 360 dev_info(dev, "initialized sunXi IR driver\n"); 361 return 0; 362 363 exit_free_dev: 364 rc_free_device(ir->rc); 365 366 return ret; 367 } 368 369 static void sunxi_ir_remove(struct platform_device *pdev) 370 { 371 struct sunxi_ir *ir = platform_get_drvdata(pdev); 372 373 rc_unregister_device(ir->rc); 374 sunxi_ir_hw_exit(&pdev->dev); 375 } 376 377 static void sunxi_ir_shutdown(struct platform_device *pdev) 378 { 379 sunxi_ir_hw_exit(&pdev->dev); 380 } 381 382 static const struct sunxi_ir_quirks sun4i_a10_ir_quirks = { 383 .has_reset = false, 384 .fifo_size = 16, 385 }; 386 387 static const struct sunxi_ir_quirks sun5i_a13_ir_quirks = { 388 .has_reset = false, 389 .fifo_size = 64, 390 }; 391 392 static const struct sunxi_ir_quirks sun6i_a31_ir_quirks = { 393 .has_reset = true, 394 .fifo_size = 64, 395 }; 396 397 static const struct of_device_id sunxi_ir_match[] = { 398 { 399 .compatible = "allwinner,sun4i-a10-ir", 400 .data = &sun4i_a10_ir_quirks, 401 }, 402 { 403 .compatible = "allwinner,sun5i-a13-ir", 404 .data = &sun5i_a13_ir_quirks, 405 }, 406 { 407 .compatible = "allwinner,sun6i-a31-ir", 408 .data = &sun6i_a31_ir_quirks, 409 }, 410 {} 411 }; 412 MODULE_DEVICE_TABLE(of, sunxi_ir_match); 413 414 static struct platform_driver sunxi_ir_driver = { 415 .probe = sunxi_ir_probe, 416 .remove_new = sunxi_ir_remove, 417 .shutdown = sunxi_ir_shutdown, 418 .driver = { 419 .name = SUNXI_IR_DEV, 420 .of_match_table = sunxi_ir_match, 421 .pm = &sunxi_ir_pm_ops, 422 }, 423 }; 424 425 module_platform_driver(sunxi_ir_driver); 426 427 MODULE_DESCRIPTION("Allwinner sunXi IR controller driver"); 428 MODULE_AUTHOR("Alexsey Shestacov <wingrime@linux-sunxi.org>"); 429 MODULE_LICENSE("GPL"); 430