1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Analog Devices Generic AXI ADC IP core 4 * Link: https://wiki.analog.com/resources/fpga/docs/axi_adc_ip 5 * 6 * Copyright 2012-2020 Analog Devices Inc. 7 */ 8 9 #include <linux/bitfield.h> 10 #include <linux/clk.h> 11 #include <linux/io.h> 12 #include <linux/delay.h> 13 #include <linux/module.h> 14 #include <linux/of_device.h> 15 #include <linux/platform_device.h> 16 #include <linux/slab.h> 17 18 #include <linux/iio/iio.h> 19 #include <linux/iio/sysfs.h> 20 #include <linux/iio/buffer.h> 21 #include <linux/iio/buffer-dmaengine.h> 22 23 #include <linux/fpga/adi-axi-common.h> 24 #include <linux/iio/adc/adi-axi-adc.h> 25 26 /** 27 * Register definitions: 28 * https://wiki.analog.com/resources/fpga/docs/axi_adc_ip#register_map 29 */ 30 31 /* ADC controls */ 32 33 #define ADI_AXI_REG_RSTN 0x0040 34 #define ADI_AXI_REG_RSTN_CE_N BIT(2) 35 #define ADI_AXI_REG_RSTN_MMCM_RSTN BIT(1) 36 #define ADI_AXI_REG_RSTN_RSTN BIT(0) 37 38 /* ADC Channel controls */ 39 40 #define ADI_AXI_REG_CHAN_CTRL(c) (0x0400 + (c) * 0x40) 41 #define ADI_AXI_REG_CHAN_CTRL_LB_OWR BIT(11) 42 #define ADI_AXI_REG_CHAN_CTRL_PN_SEL_OWR BIT(10) 43 #define ADI_AXI_REG_CHAN_CTRL_IQCOR_EN BIT(9) 44 #define ADI_AXI_REG_CHAN_CTRL_DCFILT_EN BIT(8) 45 #define ADI_AXI_REG_CHAN_CTRL_FMT_SIGNEXT BIT(6) 46 #define ADI_AXI_REG_CHAN_CTRL_FMT_TYPE BIT(5) 47 #define ADI_AXI_REG_CHAN_CTRL_FMT_EN BIT(4) 48 #define ADI_AXI_REG_CHAN_CTRL_PN_TYPE_OWR BIT(1) 49 #define ADI_AXI_REG_CHAN_CTRL_ENABLE BIT(0) 50 51 #define ADI_AXI_REG_CHAN_CTRL_DEFAULTS \ 52 (ADI_AXI_REG_CHAN_CTRL_FMT_SIGNEXT | \ 53 ADI_AXI_REG_CHAN_CTRL_FMT_EN | \ 54 ADI_AXI_REG_CHAN_CTRL_ENABLE) 55 56 struct adi_axi_adc_core_info { 57 unsigned int version; 58 }; 59 60 struct adi_axi_adc_state { 61 struct mutex lock; 62 63 struct adi_axi_adc_client *client; 64 void __iomem *regs; 65 }; 66 67 struct adi_axi_adc_client { 68 struct list_head entry; 69 struct adi_axi_adc_conv conv; 70 struct adi_axi_adc_state *state; 71 struct device *dev; 72 const struct adi_axi_adc_core_info *info; 73 }; 74 75 static LIST_HEAD(registered_clients); 76 static DEFINE_MUTEX(registered_clients_lock); 77 78 static struct adi_axi_adc_client *conv_to_client(struct adi_axi_adc_conv *conv) 79 { 80 return container_of(conv, struct adi_axi_adc_client, conv); 81 } 82 83 void *adi_axi_adc_conv_priv(struct adi_axi_adc_conv *conv) 84 { 85 struct adi_axi_adc_client *cl = conv_to_client(conv); 86 87 return (char *)cl + ALIGN(sizeof(struct adi_axi_adc_client), IIO_ALIGN); 88 } 89 EXPORT_SYMBOL_GPL(adi_axi_adc_conv_priv); 90 91 static void adi_axi_adc_write(struct adi_axi_adc_state *st, 92 unsigned int reg, 93 unsigned int val) 94 { 95 iowrite32(val, st->regs + reg); 96 } 97 98 static unsigned int adi_axi_adc_read(struct adi_axi_adc_state *st, 99 unsigned int reg) 100 { 101 return ioread32(st->regs + reg); 102 } 103 104 static int adi_axi_adc_config_dma_buffer(struct device *dev, 105 struct iio_dev *indio_dev) 106 { 107 struct iio_buffer *buffer; 108 const char *dma_name; 109 110 if (!device_property_present(dev, "dmas")) 111 return 0; 112 113 if (device_property_read_string(dev, "dma-names", &dma_name)) 114 dma_name = "rx"; 115 116 buffer = devm_iio_dmaengine_buffer_alloc(indio_dev->dev.parent, 117 dma_name); 118 if (IS_ERR(buffer)) 119 return PTR_ERR(buffer); 120 121 indio_dev->modes |= INDIO_BUFFER_HARDWARE; 122 iio_device_attach_buffer(indio_dev, buffer); 123 124 return 0; 125 } 126 127 static int adi_axi_adc_read_raw(struct iio_dev *indio_dev, 128 struct iio_chan_spec const *chan, 129 int *val, int *val2, long mask) 130 { 131 struct adi_axi_adc_state *st = iio_priv(indio_dev); 132 struct adi_axi_adc_conv *conv = &st->client->conv; 133 134 if (!conv->read_raw) 135 return -EOPNOTSUPP; 136 137 return conv->read_raw(conv, chan, val, val2, mask); 138 } 139 140 static int adi_axi_adc_write_raw(struct iio_dev *indio_dev, 141 struct iio_chan_spec const *chan, 142 int val, int val2, long mask) 143 { 144 struct adi_axi_adc_state *st = iio_priv(indio_dev); 145 struct adi_axi_adc_conv *conv = &st->client->conv; 146 147 if (!conv->write_raw) 148 return -EOPNOTSUPP; 149 150 return conv->write_raw(conv, chan, val, val2, mask); 151 } 152 153 static int adi_axi_adc_update_scan_mode(struct iio_dev *indio_dev, 154 const unsigned long *scan_mask) 155 { 156 struct adi_axi_adc_state *st = iio_priv(indio_dev); 157 struct adi_axi_adc_conv *conv = &st->client->conv; 158 unsigned int i, ctrl; 159 160 for (i = 0; i < conv->chip_info->num_channels; i++) { 161 ctrl = adi_axi_adc_read(st, ADI_AXI_REG_CHAN_CTRL(i)); 162 163 if (test_bit(i, scan_mask)) 164 ctrl |= ADI_AXI_REG_CHAN_CTRL_ENABLE; 165 else 166 ctrl &= ~ADI_AXI_REG_CHAN_CTRL_ENABLE; 167 168 adi_axi_adc_write(st, ADI_AXI_REG_CHAN_CTRL(i), ctrl); 169 } 170 171 return 0; 172 } 173 174 static struct adi_axi_adc_conv *adi_axi_adc_conv_register(struct device *dev, 175 size_t sizeof_priv) 176 { 177 struct adi_axi_adc_client *cl; 178 size_t alloc_size; 179 180 alloc_size = ALIGN(sizeof(struct adi_axi_adc_client), IIO_ALIGN); 181 if (sizeof_priv) 182 alloc_size += ALIGN(sizeof_priv, IIO_ALIGN); 183 184 cl = kzalloc(alloc_size, GFP_KERNEL); 185 if (!cl) 186 return ERR_PTR(-ENOMEM); 187 188 mutex_lock(®istered_clients_lock); 189 190 cl->dev = get_device(dev); 191 192 list_add_tail(&cl->entry, ®istered_clients); 193 194 mutex_unlock(®istered_clients_lock); 195 196 return &cl->conv; 197 } 198 199 static void adi_axi_adc_conv_unregister(struct adi_axi_adc_conv *conv) 200 { 201 struct adi_axi_adc_client *cl = conv_to_client(conv); 202 203 mutex_lock(®istered_clients_lock); 204 205 list_del(&cl->entry); 206 put_device(cl->dev); 207 208 mutex_unlock(®istered_clients_lock); 209 210 kfree(cl); 211 } 212 213 static void devm_adi_axi_adc_conv_release(struct device *dev, void *res) 214 { 215 adi_axi_adc_conv_unregister(*(struct adi_axi_adc_conv **)res); 216 } 217 218 struct adi_axi_adc_conv *devm_adi_axi_adc_conv_register(struct device *dev, 219 size_t sizeof_priv) 220 { 221 struct adi_axi_adc_conv **ptr, *conv; 222 223 ptr = devres_alloc(devm_adi_axi_adc_conv_release, sizeof(*ptr), 224 GFP_KERNEL); 225 if (!ptr) 226 return ERR_PTR(-ENOMEM); 227 228 conv = adi_axi_adc_conv_register(dev, sizeof_priv); 229 if (IS_ERR(conv)) { 230 devres_free(ptr); 231 return ERR_CAST(conv); 232 } 233 234 *ptr = conv; 235 devres_add(dev, ptr); 236 237 return conv; 238 } 239 EXPORT_SYMBOL_GPL(devm_adi_axi_adc_conv_register); 240 241 static ssize_t in_voltage_scale_available_show(struct device *dev, 242 struct device_attribute *attr, 243 char *buf) 244 { 245 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 246 struct adi_axi_adc_state *st = iio_priv(indio_dev); 247 struct adi_axi_adc_conv *conv = &st->client->conv; 248 size_t len = 0; 249 int i; 250 251 for (i = 0; i < conv->chip_info->num_scales; i++) { 252 const unsigned int *s = conv->chip_info->scale_table[i]; 253 254 len += scnprintf(buf + len, PAGE_SIZE - len, 255 "%u.%06u ", s[0], s[1]); 256 } 257 buf[len - 1] = '\n'; 258 259 return len; 260 } 261 262 static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0); 263 264 enum { 265 ADI_AXI_ATTR_SCALE_AVAIL, 266 }; 267 268 #define ADI_AXI_ATTR(_en_, _file_) \ 269 [ADI_AXI_ATTR_##_en_] = &iio_dev_attr_##_file_.dev_attr.attr 270 271 static struct attribute *adi_axi_adc_attributes[] = { 272 ADI_AXI_ATTR(SCALE_AVAIL, in_voltage_scale_available), 273 NULL 274 }; 275 276 static umode_t axi_adc_attr_is_visible(struct kobject *kobj, 277 struct attribute *attr, int n) 278 { 279 struct device *dev = kobj_to_dev(kobj); 280 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 281 struct adi_axi_adc_state *st = iio_priv(indio_dev); 282 struct adi_axi_adc_conv *conv = &st->client->conv; 283 284 switch (n) { 285 case ADI_AXI_ATTR_SCALE_AVAIL: 286 if (!conv->chip_info->num_scales) 287 return 0; 288 return attr->mode; 289 default: 290 return attr->mode; 291 } 292 } 293 294 static const struct attribute_group adi_axi_adc_attribute_group = { 295 .attrs = adi_axi_adc_attributes, 296 .is_visible = axi_adc_attr_is_visible, 297 }; 298 299 static const struct iio_info adi_axi_adc_info = { 300 .read_raw = &adi_axi_adc_read_raw, 301 .write_raw = &adi_axi_adc_write_raw, 302 .attrs = &adi_axi_adc_attribute_group, 303 .update_scan_mode = &adi_axi_adc_update_scan_mode, 304 }; 305 306 static const struct adi_axi_adc_core_info adi_axi_adc_10_0_a_info = { 307 .version = ADI_AXI_PCORE_VER(10, 0, 'a'), 308 }; 309 310 static struct adi_axi_adc_client *adi_axi_adc_attach_client(struct device *dev) 311 { 312 const struct adi_axi_adc_core_info *info; 313 struct adi_axi_adc_client *cl; 314 struct device_node *cln; 315 316 info = of_device_get_match_data(dev); 317 if (!info) 318 return ERR_PTR(-ENODEV); 319 320 cln = of_parse_phandle(dev->of_node, "adi,adc-dev", 0); 321 if (!cln) { 322 dev_err(dev, "No 'adi,adc-dev' node defined\n"); 323 return ERR_PTR(-ENODEV); 324 } 325 326 mutex_lock(®istered_clients_lock); 327 328 list_for_each_entry(cl, ®istered_clients, entry) { 329 if (!cl->dev) 330 continue; 331 332 if (cl->dev->of_node != cln) 333 continue; 334 335 if (!try_module_get(cl->dev->driver->owner)) { 336 mutex_unlock(®istered_clients_lock); 337 return ERR_PTR(-ENODEV); 338 } 339 340 get_device(cl->dev); 341 cl->info = info; 342 mutex_unlock(®istered_clients_lock); 343 return cl; 344 } 345 346 mutex_unlock(®istered_clients_lock); 347 348 return ERR_PTR(-EPROBE_DEFER); 349 } 350 351 static int adi_axi_adc_setup_channels(struct device *dev, 352 struct adi_axi_adc_state *st) 353 { 354 struct adi_axi_adc_conv *conv = &st->client->conv; 355 int i, ret; 356 357 if (conv->preenable_setup) { 358 ret = conv->preenable_setup(conv); 359 if (ret) 360 return ret; 361 } 362 363 for (i = 0; i < conv->chip_info->num_channels; i++) { 364 adi_axi_adc_write(st, ADI_AXI_REG_CHAN_CTRL(i), 365 ADI_AXI_REG_CHAN_CTRL_DEFAULTS); 366 } 367 368 return 0; 369 } 370 371 static void axi_adc_reset(struct adi_axi_adc_state *st) 372 { 373 adi_axi_adc_write(st, ADI_AXI_REG_RSTN, 0); 374 mdelay(10); 375 adi_axi_adc_write(st, ADI_AXI_REG_RSTN, ADI_AXI_REG_RSTN_MMCM_RSTN); 376 mdelay(10); 377 adi_axi_adc_write(st, ADI_AXI_REG_RSTN, 378 ADI_AXI_REG_RSTN_RSTN | ADI_AXI_REG_RSTN_MMCM_RSTN); 379 } 380 381 static void adi_axi_adc_cleanup(void *data) 382 { 383 struct adi_axi_adc_client *cl = data; 384 385 put_device(cl->dev); 386 module_put(cl->dev->driver->owner); 387 } 388 389 static int adi_axi_adc_probe(struct platform_device *pdev) 390 { 391 struct adi_axi_adc_conv *conv; 392 struct iio_dev *indio_dev; 393 struct adi_axi_adc_client *cl; 394 struct adi_axi_adc_state *st; 395 unsigned int ver; 396 int ret; 397 398 cl = adi_axi_adc_attach_client(&pdev->dev); 399 if (IS_ERR(cl)) 400 return PTR_ERR(cl); 401 402 ret = devm_add_action_or_reset(&pdev->dev, adi_axi_adc_cleanup, cl); 403 if (ret) 404 return ret; 405 406 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st)); 407 if (indio_dev == NULL) 408 return -ENOMEM; 409 410 st = iio_priv(indio_dev); 411 st->client = cl; 412 cl->state = st; 413 mutex_init(&st->lock); 414 415 st->regs = devm_platform_ioremap_resource(pdev, 0); 416 if (IS_ERR(st->regs)) 417 return PTR_ERR(st->regs); 418 419 conv = &st->client->conv; 420 421 axi_adc_reset(st); 422 423 ver = adi_axi_adc_read(st, ADI_AXI_REG_VERSION); 424 425 if (cl->info->version > ver) { 426 dev_err(&pdev->dev, 427 "IP core version is too old. Expected %d.%.2d.%c, Reported %d.%.2d.%c\n", 428 ADI_AXI_PCORE_VER_MAJOR(cl->info->version), 429 ADI_AXI_PCORE_VER_MINOR(cl->info->version), 430 ADI_AXI_PCORE_VER_PATCH(cl->info->version), 431 ADI_AXI_PCORE_VER_MAJOR(ver), 432 ADI_AXI_PCORE_VER_MINOR(ver), 433 ADI_AXI_PCORE_VER_PATCH(ver)); 434 return -ENODEV; 435 } 436 437 indio_dev->info = &adi_axi_adc_info; 438 indio_dev->name = "adi-axi-adc"; 439 indio_dev->modes = INDIO_DIRECT_MODE; 440 indio_dev->num_channels = conv->chip_info->num_channels; 441 indio_dev->channels = conv->chip_info->channels; 442 443 ret = adi_axi_adc_config_dma_buffer(&pdev->dev, indio_dev); 444 if (ret) 445 return ret; 446 447 ret = adi_axi_adc_setup_channels(&pdev->dev, st); 448 if (ret) 449 return ret; 450 451 ret = devm_iio_device_register(&pdev->dev, indio_dev); 452 if (ret) 453 return ret; 454 455 dev_info(&pdev->dev, "AXI ADC IP core (%d.%.2d.%c) probed\n", 456 ADI_AXI_PCORE_VER_MAJOR(ver), 457 ADI_AXI_PCORE_VER_MINOR(ver), 458 ADI_AXI_PCORE_VER_PATCH(ver)); 459 460 return 0; 461 } 462 463 /* Match table for of_platform binding */ 464 static const struct of_device_id adi_axi_adc_of_match[] = { 465 { .compatible = "adi,axi-adc-10.0.a", .data = &adi_axi_adc_10_0_a_info }, 466 { /* end of list */ } 467 }; 468 MODULE_DEVICE_TABLE(of, adi_axi_adc_of_match); 469 470 static struct platform_driver adi_axi_adc_driver = { 471 .driver = { 472 .name = KBUILD_MODNAME, 473 .of_match_table = adi_axi_adc_of_match, 474 }, 475 .probe = adi_axi_adc_probe, 476 }; 477 module_platform_driver(adi_axi_adc_driver); 478 479 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 480 MODULE_DESCRIPTION("Analog Devices Generic AXI ADC IP core driver"); 481 MODULE_LICENSE("GPL v2"); 482