1 /* 2 * Driver for Allwinner sunXi IR controller 3 * 4 * Copyright (C) 2014 Alexsey Shestacov <wingrime@linux-sunxi.org> 5 * Copyright (C) 2014 Alexander Bersenev <bay@hackerdom.ru> 6 * 7 * Based on sun5i-ir.c: 8 * Copyright (C) 2007-2012 Daniel Wang 9 * Allwinner Technology Co., Ltd. <www.allwinnertech.com> 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License as 13 * published by the Free Software Foundation; either version 2 of 14 * the License, or (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 */ 21 22 #include <linux/clk.h> 23 #include <linux/interrupt.h> 24 #include <linux/module.h> 25 #include <linux/of_platform.h> 26 #include <linux/reset.h> 27 #include <media/rc-core.h> 28 29 #define SUNXI_IR_DEV "sunxi-ir" 30 31 /* Registers */ 32 /* IR Control */ 33 #define SUNXI_IR_CTL_REG 0x00 34 /* Global Enable */ 35 #define REG_CTL_GEN BIT(0) 36 /* RX block enable */ 37 #define REG_CTL_RXEN BIT(1) 38 /* CIR mode */ 39 #define REG_CTL_MD (BIT(4) | BIT(5)) 40 41 /* Rx Config */ 42 #define SUNXI_IR_RXCTL_REG 0x10 43 /* Pulse Polarity Invert flag */ 44 #define REG_RXCTL_RPPI BIT(2) 45 46 /* Rx Data */ 47 #define SUNXI_IR_RXFIFO_REG 0x20 48 49 /* Rx Interrupt Enable */ 50 #define SUNXI_IR_RXINT_REG 0x2C 51 /* Rx FIFO Overflow */ 52 #define REG_RXINT_ROI_EN BIT(0) 53 /* Rx Packet End */ 54 #define REG_RXINT_RPEI_EN BIT(1) 55 /* Rx FIFO Data Available */ 56 #define REG_RXINT_RAI_EN BIT(4) 57 58 /* Rx FIFO available byte level */ 59 #define REG_RXINT_RAL(val) ((val) << 8) 60 61 /* Rx Interrupt Status */ 62 #define SUNXI_IR_RXSTA_REG 0x30 63 /* RX FIFO Get Available Counter */ 64 #define REG_RXSTA_GET_AC(val) (((val) >> 8) & (ir->fifo_size * 2 - 1)) 65 /* Clear all interrupt status value */ 66 #define REG_RXSTA_CLEARALL 0xff 67 68 /* IR Sample Config */ 69 #define SUNXI_IR_CIR_REG 0x34 70 /* CIR_REG register noise threshold */ 71 #define REG_CIR_NTHR(val) (((val) << 2) & (GENMASK(7, 2))) 72 /* CIR_REG register idle threshold */ 73 #define REG_CIR_ITHR(val) (((val) << 8) & (GENMASK(15, 8))) 74 75 /* Required frequency for IR0 or IR1 clock in CIR mode */ 76 #define SUNXI_IR_BASE_CLK 8000000 77 /* Frequency after IR internal divider */ 78 #define SUNXI_IR_CLK (SUNXI_IR_BASE_CLK / 64) 79 /* Sample period in ns */ 80 #define SUNXI_IR_SAMPLE (1000000000ul / SUNXI_IR_CLK) 81 /* Noise threshold in samples */ 82 #define SUNXI_IR_RXNOISE 1 83 /* Idle Threshold in samples */ 84 #define SUNXI_IR_RXIDLE 20 85 /* Time after which device stops sending data in ms */ 86 #define SUNXI_IR_TIMEOUT 120 87 88 struct sunxi_ir { 89 spinlock_t ir_lock; 90 struct rc_dev *rc; 91 void __iomem *base; 92 int irq; 93 int fifo_size; 94 struct clk *clk; 95 struct clk *apb_clk; 96 struct reset_control *rst; 97 const char *map_name; 98 }; 99 100 static irqreturn_t sunxi_ir_irq(int irqno, void *dev_id) 101 { 102 unsigned long status; 103 unsigned char dt; 104 unsigned int cnt, rc; 105 struct sunxi_ir *ir = dev_id; 106 DEFINE_IR_RAW_EVENT(rawir); 107 108 spin_lock(&ir->ir_lock); 109 110 status = readl(ir->base + SUNXI_IR_RXSTA_REG); 111 112 /* clean all pending statuses */ 113 writel(status | REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG); 114 115 if (status & (REG_RXINT_RAI_EN | REG_RXINT_RPEI_EN)) { 116 /* How many messages in fifo */ 117 rc = REG_RXSTA_GET_AC(status); 118 /* Sanity check */ 119 rc = rc > ir->fifo_size ? ir->fifo_size : rc; 120 /* If we have data */ 121 for (cnt = 0; cnt < rc; cnt++) { 122 /* for each bit in fifo */ 123 dt = readb(ir->base + SUNXI_IR_RXFIFO_REG); 124 rawir.pulse = (dt & 0x80) != 0; 125 rawir.duration = ((dt & 0x7f) + 1) * SUNXI_IR_SAMPLE; 126 ir_raw_event_store_with_filter(ir->rc, &rawir); 127 } 128 } 129 130 if (status & REG_RXINT_ROI_EN) { 131 ir_raw_event_reset(ir->rc); 132 } else if (status & REG_RXINT_RPEI_EN) { 133 ir_raw_event_set_idle(ir->rc, true); 134 ir_raw_event_handle(ir->rc); 135 } 136 137 spin_unlock(&ir->ir_lock); 138 139 return IRQ_HANDLED; 140 } 141 142 static int sunxi_ir_probe(struct platform_device *pdev) 143 { 144 int ret = 0; 145 unsigned long tmp = 0; 146 147 struct device *dev = &pdev->dev; 148 struct device_node *dn = dev->of_node; 149 struct resource *res; 150 struct sunxi_ir *ir; 151 152 ir = devm_kzalloc(dev, sizeof(struct sunxi_ir), GFP_KERNEL); 153 if (!ir) 154 return -ENOMEM; 155 156 spin_lock_init(&ir->ir_lock); 157 158 if (of_device_is_compatible(dn, "allwinner,sun5i-a13-ir")) 159 ir->fifo_size = 64; 160 else 161 ir->fifo_size = 16; 162 163 /* Clock */ 164 ir->apb_clk = devm_clk_get(dev, "apb"); 165 if (IS_ERR(ir->apb_clk)) { 166 dev_err(dev, "failed to get a apb clock.\n"); 167 return PTR_ERR(ir->apb_clk); 168 } 169 ir->clk = devm_clk_get(dev, "ir"); 170 if (IS_ERR(ir->clk)) { 171 dev_err(dev, "failed to get a ir clock.\n"); 172 return PTR_ERR(ir->clk); 173 } 174 175 /* Reset (optional) */ 176 ir->rst = devm_reset_control_get_optional(dev, NULL); 177 if (IS_ERR(ir->rst)) 178 return PTR_ERR(ir->rst); 179 ret = reset_control_deassert(ir->rst); 180 if (ret) 181 return ret; 182 183 ret = clk_set_rate(ir->clk, SUNXI_IR_BASE_CLK); 184 if (ret) { 185 dev_err(dev, "set ir base clock failed!\n"); 186 goto exit_reset_assert; 187 } 188 189 if (clk_prepare_enable(ir->apb_clk)) { 190 dev_err(dev, "try to enable apb_ir_clk failed\n"); 191 ret = -EINVAL; 192 goto exit_reset_assert; 193 } 194 195 if (clk_prepare_enable(ir->clk)) { 196 dev_err(dev, "try to enable ir_clk failed\n"); 197 ret = -EINVAL; 198 goto exit_clkdisable_apb_clk; 199 } 200 201 /* IO */ 202 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 203 ir->base = devm_ioremap_resource(dev, res); 204 if (IS_ERR(ir->base)) { 205 dev_err(dev, "failed to map registers\n"); 206 ret = PTR_ERR(ir->base); 207 goto exit_clkdisable_clk; 208 } 209 210 ir->rc = rc_allocate_device(RC_DRIVER_IR_RAW); 211 if (!ir->rc) { 212 dev_err(dev, "failed to allocate device\n"); 213 ret = -ENOMEM; 214 goto exit_clkdisable_clk; 215 } 216 217 ir->rc->priv = ir; 218 ir->rc->input_name = SUNXI_IR_DEV; 219 ir->rc->input_phys = "sunxi-ir/input0"; 220 ir->rc->input_id.bustype = BUS_HOST; 221 ir->rc->input_id.vendor = 0x0001; 222 ir->rc->input_id.product = 0x0001; 223 ir->rc->input_id.version = 0x0100; 224 ir->map_name = of_get_property(dn, "linux,rc-map-name", NULL); 225 ir->rc->map_name = ir->map_name ?: RC_MAP_EMPTY; 226 ir->rc->dev.parent = dev; 227 ir->rc->allowed_protocols = RC_BIT_ALL_IR_DECODER; 228 ir->rc->rx_resolution = SUNXI_IR_SAMPLE; 229 ir->rc->timeout = MS_TO_NS(SUNXI_IR_TIMEOUT); 230 ir->rc->driver_name = SUNXI_IR_DEV; 231 232 ret = rc_register_device(ir->rc); 233 if (ret) { 234 dev_err(dev, "failed to register rc device\n"); 235 goto exit_free_dev; 236 } 237 238 platform_set_drvdata(pdev, ir); 239 240 /* IRQ */ 241 ir->irq = platform_get_irq(pdev, 0); 242 if (ir->irq < 0) { 243 dev_err(dev, "no irq resource\n"); 244 ret = ir->irq; 245 goto exit_free_dev; 246 } 247 248 ret = devm_request_irq(dev, ir->irq, sunxi_ir_irq, 0, SUNXI_IR_DEV, ir); 249 if (ret) { 250 dev_err(dev, "failed request irq\n"); 251 goto exit_free_dev; 252 } 253 254 /* Enable CIR Mode */ 255 writel(REG_CTL_MD, ir->base+SUNXI_IR_CTL_REG); 256 257 /* Set noise threshold and idle threshold */ 258 writel(REG_CIR_NTHR(SUNXI_IR_RXNOISE)|REG_CIR_ITHR(SUNXI_IR_RXIDLE), 259 ir->base + SUNXI_IR_CIR_REG); 260 261 /* Invert Input Signal */ 262 writel(REG_RXCTL_RPPI, ir->base + SUNXI_IR_RXCTL_REG); 263 264 /* Clear All Rx Interrupt Status */ 265 writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG); 266 267 /* 268 * Enable IRQ on overflow, packet end, FIFO available with trigger 269 * level 270 */ 271 writel(REG_RXINT_ROI_EN | REG_RXINT_RPEI_EN | 272 REG_RXINT_RAI_EN | REG_RXINT_RAL(ir->fifo_size / 2 - 1), 273 ir->base + SUNXI_IR_RXINT_REG); 274 275 /* Enable IR Module */ 276 tmp = readl(ir->base + SUNXI_IR_CTL_REG); 277 writel(tmp | REG_CTL_GEN | REG_CTL_RXEN, ir->base + SUNXI_IR_CTL_REG); 278 279 dev_info(dev, "initialized sunXi IR driver\n"); 280 return 0; 281 282 exit_free_dev: 283 rc_free_device(ir->rc); 284 exit_clkdisable_clk: 285 clk_disable_unprepare(ir->clk); 286 exit_clkdisable_apb_clk: 287 clk_disable_unprepare(ir->apb_clk); 288 exit_reset_assert: 289 reset_control_assert(ir->rst); 290 291 return ret; 292 } 293 294 static int sunxi_ir_remove(struct platform_device *pdev) 295 { 296 unsigned long flags; 297 struct sunxi_ir *ir = platform_get_drvdata(pdev); 298 299 clk_disable_unprepare(ir->clk); 300 clk_disable_unprepare(ir->apb_clk); 301 reset_control_assert(ir->rst); 302 303 spin_lock_irqsave(&ir->ir_lock, flags); 304 /* disable IR IRQ */ 305 writel(0, ir->base + SUNXI_IR_RXINT_REG); 306 /* clear All Rx Interrupt Status */ 307 writel(REG_RXSTA_CLEARALL, ir->base + SUNXI_IR_RXSTA_REG); 308 /* disable IR */ 309 writel(0, ir->base + SUNXI_IR_CTL_REG); 310 spin_unlock_irqrestore(&ir->ir_lock, flags); 311 312 rc_unregister_device(ir->rc); 313 return 0; 314 } 315 316 static const struct of_device_id sunxi_ir_match[] = { 317 { .compatible = "allwinner,sun4i-a10-ir", }, 318 { .compatible = "allwinner,sun5i-a13-ir", }, 319 {}, 320 }; 321 MODULE_DEVICE_TABLE(of, sunxi_ir_match); 322 323 static struct platform_driver sunxi_ir_driver = { 324 .probe = sunxi_ir_probe, 325 .remove = sunxi_ir_remove, 326 .driver = { 327 .name = SUNXI_IR_DEV, 328 .of_match_table = sunxi_ir_match, 329 }, 330 }; 331 332 module_platform_driver(sunxi_ir_driver); 333 334 MODULE_DESCRIPTION("Allwinner sunXi IR controller driver"); 335 MODULE_AUTHOR("Alexsey Shestacov <wingrime@linux-sunxi.org>"); 336 MODULE_LICENSE("GPL"); 337