1 /* 2 * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net> 3 * 4 * Changes for multibus/multiadapter I2C support. 5 * 6 * (C) Copyright 2000 7 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it 8 * 9 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <config.h> 13 #include <common.h> 14 #include <dm.h> 15 #include <errno.h> 16 #include <stdarg.h> 17 #include <malloc.h> 18 #include <stdio_dev.h> 19 #include <serial.h> 20 #ifdef CONFIG_LOGBUFFER 21 #include <logbuff.h> 22 #endif 23 24 #if defined(CONFIG_HARD_I2C) || defined(CONFIG_SYS_I2C) 25 #include <i2c.h> 26 #endif 27 28 #include <dm/device-internal.h> 29 30 DECLARE_GLOBAL_DATA_PTR; 31 32 static struct stdio_dev devs; 33 struct stdio_dev *stdio_devices[] = { NULL, NULL, NULL }; 34 char *stdio_names[MAX_FILES] = { "stdin", "stdout", "stderr" }; 35 36 #if defined(CONFIG_SPLASH_SCREEN) && !defined(CONFIG_SYS_DEVICE_NULLDEV) 37 #define CONFIG_SYS_DEVICE_NULLDEV 1 38 #endif 39 40 #if CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER) 41 #define CONFIG_SYS_DEVICE_NULLDEV 1 42 #endif 43 44 #ifdef CONFIG_SYS_DEVICE_NULLDEV 45 static void nulldev_putc(struct stdio_dev *dev, const char c) 46 { 47 /* nulldev is empty! */ 48 } 49 50 static void nulldev_puts(struct stdio_dev *dev, const char *s) 51 { 52 /* nulldev is empty! */ 53 } 54 55 static int nulldev_input(struct stdio_dev *dev) 56 { 57 /* nulldev is empty! */ 58 return 0; 59 } 60 #endif 61 62 static void stdio_serial_putc(struct stdio_dev *dev, const char c) 63 { 64 serial_putc(c); 65 } 66 67 static void stdio_serial_puts(struct stdio_dev *dev, const char *s) 68 { 69 serial_puts(s); 70 } 71 72 static int stdio_serial_getc(struct stdio_dev *dev) 73 { 74 return serial_getc(); 75 } 76 77 static int stdio_serial_tstc(struct stdio_dev *dev) 78 { 79 return serial_tstc(); 80 } 81 82 /************************************************************************** 83 * SYSTEM DRIVERS 84 ************************************************************************** 85 */ 86 87 static void drv_system_init (void) 88 { 89 struct stdio_dev dev; 90 91 memset (&dev, 0, sizeof (dev)); 92 93 strcpy (dev.name, "serial"); 94 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; 95 dev.putc = stdio_serial_putc; 96 dev.puts = stdio_serial_puts; 97 dev.getc = stdio_serial_getc; 98 dev.tstc = stdio_serial_tstc; 99 stdio_register (&dev); 100 101 #ifdef CONFIG_SYS_DEVICE_NULLDEV 102 memset (&dev, 0, sizeof (dev)); 103 104 strcpy (dev.name, "nulldev"); 105 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; 106 dev.putc = nulldev_putc; 107 dev.puts = nulldev_puts; 108 dev.getc = nulldev_input; 109 dev.tstc = nulldev_input; 110 111 stdio_register (&dev); 112 #endif 113 } 114 115 /************************************************************************** 116 * DEVICES 117 ************************************************************************** 118 */ 119 struct list_head* stdio_get_list(void) 120 { 121 return &(devs.list); 122 } 123 124 #ifdef CONFIG_DM_VIDEO 125 /** 126 * stdio_probe_device() - Find a device which provides the given stdio device 127 * 128 * This looks for a device of the given uclass which provides a particular 129 * stdio device. It is currently really only useful for UCLASS_VIDEO. 130 * 131 * Ultimately we want to be able to probe a device by its stdio name. At 132 * present devices register in their probe function (for video devices this 133 * is done in vidconsole_post_probe()) and we don't know what name they will 134 * use until they do so. 135 * TODO(sjg@chromium.org): We should be able to determine the name before 136 * probing, and probe the required device. 137 * 138 * @name: stdio device name (e.g. "vidconsole") 139 * id: Uclass ID of device to look for (e.g. UCLASS_VIDEO) 140 * @sdevp: Returns stdout device, if found, else NULL 141 * @return 0 if found, -ENOENT if no device found with that name, other -ve 142 * on other error 143 */ 144 static int stdio_probe_device(const char *name, enum uclass_id id, 145 struct stdio_dev **sdevp) 146 { 147 struct stdio_dev *sdev; 148 struct udevice *dev; 149 int seq, ret; 150 151 *sdevp = NULL; 152 seq = trailing_strtoln(name, NULL); 153 if (seq == -1) 154 seq = 0; 155 ret = uclass_get_device_by_seq(id, seq, &dev); 156 if (ret == -ENODEV) 157 ret = uclass_first_device_err(id, &dev); 158 if (ret) { 159 debug("No %s device for seq %d (%s)\n", uclass_get_name(id), 160 seq, name); 161 return ret; 162 } 163 /* The device should be be the last one registered */ 164 sdev = list_empty(&devs.list) ? NULL : 165 list_last_entry(&devs.list, struct stdio_dev, list); 166 if (!sdev || strcmp(sdev->name, name)) { 167 debug("Device '%s' did not register with stdio as '%s'\n", 168 dev->name, name); 169 return -ENOENT; 170 } 171 *sdevp = sdev; 172 173 return 0; 174 } 175 #endif 176 177 struct stdio_dev *stdio_get_by_name(const char *name) 178 { 179 struct list_head *pos; 180 struct stdio_dev *sdev; 181 182 if (!name) 183 return NULL; 184 185 list_for_each(pos, &(devs.list)) { 186 sdev = list_entry(pos, struct stdio_dev, list); 187 if (strcmp(sdev->name, name) == 0) 188 return sdev; 189 } 190 #ifdef CONFIG_DM_VIDEO 191 /* 192 * We did not find a suitable stdio device. If there is a video 193 * driver with a name starting with 'vidconsole', we can try probing 194 * that in the hope that it will produce the required stdio device. 195 * 196 * This function is sometimes called with the entire value of 197 * 'stdout', which may include a list of devices separate by commas. 198 * Obviously this is not going to work, so we ignore that case. The 199 * call path in that case is console_init_r() -> search_device() -> 200 * stdio_get_by_name(). 201 */ 202 if (!strncmp(name, "vidconsole", 10) && !strchr(name, ',') && 203 !stdio_probe_device(name, UCLASS_VIDEO, &sdev)) 204 return sdev; 205 #endif 206 207 return NULL; 208 } 209 210 struct stdio_dev* stdio_clone(struct stdio_dev *dev) 211 { 212 struct stdio_dev *_dev; 213 214 if(!dev) 215 return NULL; 216 217 _dev = calloc(1, sizeof(struct stdio_dev)); 218 219 if(!_dev) 220 return NULL; 221 222 memcpy(_dev, dev, sizeof(struct stdio_dev)); 223 224 return _dev; 225 } 226 227 int stdio_register_dev(struct stdio_dev *dev, struct stdio_dev **devp) 228 { 229 struct stdio_dev *_dev; 230 231 _dev = stdio_clone(dev); 232 if(!_dev) 233 return -ENODEV; 234 list_add_tail(&(_dev->list), &(devs.list)); 235 if (devp) 236 *devp = _dev; 237 238 return 0; 239 } 240 241 int stdio_register(struct stdio_dev *dev) 242 { 243 return stdio_register_dev(dev, NULL); 244 } 245 246 /* deregister the device "devname". 247 * returns 0 if success, -1 if device is assigned and 1 if devname not found 248 */ 249 #if CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER) 250 int stdio_deregister_dev(struct stdio_dev *dev, int force) 251 { 252 int l; 253 struct list_head *pos; 254 char temp_names[3][16]; 255 256 /* get stdio devices (ListRemoveItem changes the dev list) */ 257 for (l=0 ; l< MAX_FILES; l++) { 258 if (stdio_devices[l] == dev) { 259 if (force) { 260 strcpy(temp_names[l], "nulldev"); 261 continue; 262 } 263 /* Device is assigned -> report error */ 264 return -1; 265 } 266 memcpy (&temp_names[l][0], 267 stdio_devices[l]->name, 268 sizeof(temp_names[l])); 269 } 270 271 list_del(&(dev->list)); 272 free(dev); 273 274 /* reassign Device list */ 275 list_for_each(pos, &(devs.list)) { 276 dev = list_entry(pos, struct stdio_dev, list); 277 for (l=0 ; l< MAX_FILES; l++) { 278 if(strcmp(dev->name, temp_names[l]) == 0) 279 stdio_devices[l] = dev; 280 } 281 } 282 return 0; 283 } 284 285 int stdio_deregister(const char *devname, int force) 286 { 287 struct stdio_dev *dev; 288 289 dev = stdio_get_by_name(devname); 290 291 if (!dev) /* device not found */ 292 return -ENODEV; 293 294 return stdio_deregister_dev(dev, force); 295 } 296 #endif /* CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER) */ 297 298 int stdio_init_tables(void) 299 { 300 #if defined(CONFIG_NEEDS_MANUAL_RELOC) 301 /* already relocated for current ARM implementation */ 302 ulong relocation_offset = gd->reloc_off; 303 int i; 304 305 /* relocate device name pointers */ 306 for (i = 0; i < (sizeof (stdio_names) / sizeof (char *)); ++i) { 307 stdio_names[i] = (char *) (((ulong) stdio_names[i]) + 308 relocation_offset); 309 } 310 #endif /* CONFIG_NEEDS_MANUAL_RELOC */ 311 312 /* Initialize the list */ 313 INIT_LIST_HEAD(&(devs.list)); 314 315 return 0; 316 } 317 318 int stdio_add_devices(void) 319 { 320 #ifdef CONFIG_DM_KEYBOARD 321 struct udevice *dev; 322 struct uclass *uc; 323 int ret; 324 325 /* 326 * For now we probe all the devices here. At some point this should be 327 * done only when the devices are required - e.g. we have a list of 328 * input devices to start up in the stdin environment variable. That 329 * work probably makes more sense when stdio itself is converted to 330 * driver model. 331 * 332 * TODO(sjg@chromium.org): Convert changing uclass_first_device() etc. 333 * to return the device even on error. Then we could use that here. 334 */ 335 ret = uclass_get(UCLASS_KEYBOARD, &uc); 336 if (ret) 337 return ret; 338 339 /* Don't report errors to the caller - assume that they are non-fatal */ 340 uclass_foreach_dev(dev, uc) { 341 ret = device_probe(dev); 342 if (ret) 343 printf("Failed to probe keyboard '%s'\n", dev->name); 344 } 345 #endif 346 #ifdef CONFIG_SYS_I2C 347 i2c_init_all(); 348 #else 349 #if defined(CONFIG_HARD_I2C) 350 i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); 351 #endif 352 #endif 353 #ifdef CONFIG_DM_VIDEO 354 /* 355 * If the console setting is not in environment variables then 356 * console_init_r() will not be calling iomux_doenv() (which calls 357 * search_device()). So we will not dynamically add devices by 358 * calling stdio_probe_device(). 359 * 360 * So just probe all video devices now so that whichever one is 361 * required will be available. 362 */ 363 #ifndef CONFIG_SYS_CONSOLE_IS_IN_ENV 364 struct udevice *vdev; 365 # ifndef CONFIG_DM_KEYBOARD 366 int ret; 367 # endif 368 369 for (ret = uclass_first_device(UCLASS_VIDEO, &vdev); 370 vdev; 371 ret = uclass_next_device(&vdev)) 372 ; 373 if (ret) 374 printf("%s: Video device failed (ret=%d)\n", __func__, ret); 375 #endif /* !CONFIG_SYS_CONSOLE_IS_IN_ENV */ 376 #else 377 # if defined(CONFIG_LCD) 378 drv_lcd_init (); 379 # endif 380 # if defined(CONFIG_VIDEO) || defined(CONFIG_CFB_CONSOLE) 381 drv_video_init (); 382 # endif 383 #endif /* CONFIG_DM_VIDEO */ 384 #if defined(CONFIG_KEYBOARD) && !defined(CONFIG_DM_KEYBOARD) 385 drv_keyboard_init (); 386 #endif 387 #ifdef CONFIG_LOGBUFFER 388 drv_logbuff_init (); 389 #endif 390 drv_system_init (); 391 serial_stdio_init (); 392 #ifdef CONFIG_USB_TTY 393 drv_usbtty_init (); 394 #endif 395 #ifdef CONFIG_NETCONSOLE 396 drv_nc_init (); 397 #endif 398 #ifdef CONFIG_JTAG_CONSOLE 399 drv_jtag_console_init (); 400 #endif 401 #ifdef CONFIG_CBMEM_CONSOLE 402 cbmemc_init(); 403 #endif 404 405 return 0; 406 } 407 408 int stdio_init(void) 409 { 410 stdio_init_tables(); 411 stdio_add_devices(); 412 413 return 0; 414 } 415