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 ret = uclass_first_device_err(id, &dev); 155 else 156 ret = uclass_get_device_by_seq(id, seq, &dev); 157 if (ret) { 158 debug("No %s device for seq %d (%s)\n", uclass_get_name(id), 159 seq, name); 160 return ret; 161 } 162 /* The device should be be the last one registered */ 163 sdev = list_empty(&devs.list) ? NULL : 164 list_last_entry(&devs.list, struct stdio_dev, list); 165 if (!sdev || strcmp(sdev->name, name)) { 166 debug("Device '%s' did not register with stdio as '%s'\n", 167 dev->name, name); 168 return -ENOENT; 169 } 170 *sdevp = sdev; 171 172 return 0; 173 } 174 #endif 175 176 struct stdio_dev* stdio_get_by_name(const char *name) 177 { 178 struct list_head *pos; 179 struct stdio_dev *sdev; 180 181 if(!name) 182 return NULL; 183 184 list_for_each(pos, &(devs.list)) { 185 sdev = list_entry(pos, struct stdio_dev, list); 186 if (strcmp(sdev->name, name) == 0) 187 return sdev; 188 } 189 #ifdef CONFIG_DM_VIDEO 190 /* 191 * We did not find a suitable stdio device. If there is a video 192 * driver with a name starting with 'vidconsole', we can try probing 193 * that in the hope that it will produce the required stdio device. 194 * 195 * This function is sometimes called with the entire value of 196 * 'stdout', which may include a list of devices separate by commas. 197 * Obviously this is not going to work, so we ignore that case. The 198 * call path in that case is console_init_r() -> search_device() -> 199 * stdio_get_by_name(). 200 */ 201 if (!strncmp(name, "vidconsole", 10) && !strchr(name, ',') && 202 !stdio_probe_device(name, UCLASS_VIDEO, &sdev)) 203 return sdev; 204 #endif 205 206 return NULL; 207 } 208 209 struct stdio_dev* stdio_clone(struct stdio_dev *dev) 210 { 211 struct stdio_dev *_dev; 212 213 if(!dev) 214 return NULL; 215 216 _dev = calloc(1, sizeof(struct stdio_dev)); 217 218 if(!_dev) 219 return NULL; 220 221 memcpy(_dev, dev, sizeof(struct stdio_dev)); 222 223 return _dev; 224 } 225 226 int stdio_register_dev(struct stdio_dev *dev, struct stdio_dev **devp) 227 { 228 struct stdio_dev *_dev; 229 230 _dev = stdio_clone(dev); 231 if(!_dev) 232 return -ENODEV; 233 list_add_tail(&(_dev->list), &(devs.list)); 234 if (devp) 235 *devp = _dev; 236 237 return 0; 238 } 239 240 int stdio_register(struct stdio_dev *dev) 241 { 242 return stdio_register_dev(dev, NULL); 243 } 244 245 /* deregister the device "devname". 246 * returns 0 if success, -1 if device is assigned and 1 if devname not found 247 */ 248 #if CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER) 249 int stdio_deregister_dev(struct stdio_dev *dev, int force) 250 { 251 int l; 252 struct list_head *pos; 253 char temp_names[3][16]; 254 255 /* get stdio devices (ListRemoveItem changes the dev list) */ 256 for (l=0 ; l< MAX_FILES; l++) { 257 if (stdio_devices[l] == dev) { 258 if (force) { 259 strcpy(temp_names[l], "nulldev"); 260 continue; 261 } 262 /* Device is assigned -> report error */ 263 return -1; 264 } 265 memcpy (&temp_names[l][0], 266 stdio_devices[l]->name, 267 sizeof(temp_names[l])); 268 } 269 270 list_del(&(dev->list)); 271 free(dev); 272 273 /* reassign Device list */ 274 list_for_each(pos, &(devs.list)) { 275 dev = list_entry(pos, struct stdio_dev, list); 276 for (l=0 ; l< MAX_FILES; l++) { 277 if(strcmp(dev->name, temp_names[l]) == 0) 278 stdio_devices[l] = dev; 279 } 280 } 281 return 0; 282 } 283 284 int stdio_deregister(const char *devname, int force) 285 { 286 struct stdio_dev *dev; 287 288 dev = stdio_get_by_name(devname); 289 290 if (!dev) /* device not found */ 291 return -ENODEV; 292 293 return stdio_deregister_dev(dev, force); 294 } 295 #endif /* CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER) */ 296 297 int stdio_init_tables(void) 298 { 299 #if defined(CONFIG_NEEDS_MANUAL_RELOC) 300 /* already relocated for current ARM implementation */ 301 ulong relocation_offset = gd->reloc_off; 302 int i; 303 304 /* relocate device name pointers */ 305 for (i = 0; i < (sizeof (stdio_names) / sizeof (char *)); ++i) { 306 stdio_names[i] = (char *) (((ulong) stdio_names[i]) + 307 relocation_offset); 308 } 309 #endif /* CONFIG_NEEDS_MANUAL_RELOC */ 310 311 /* Initialize the list */ 312 INIT_LIST_HEAD(&(devs.list)); 313 314 return 0; 315 } 316 317 int stdio_add_devices(void) 318 { 319 #ifdef CONFIG_DM_KEYBOARD 320 struct udevice *dev; 321 struct uclass *uc; 322 int ret; 323 324 /* 325 * For now we probe all the devices here. At some point this should be 326 * done only when the devices are required - e.g. we have a list of 327 * input devices to start up in the stdin environment variable. That 328 * work probably makes more sense when stdio itself is converted to 329 * driver model. 330 * 331 * TODO(sjg@chromium.org): Convert changing uclass_first_device() etc. 332 * to return the device even on error. Then we could use that here. 333 */ 334 ret = uclass_get(UCLASS_KEYBOARD, &uc); 335 if (ret) 336 return ret; 337 338 /* Don't report errors to the caller - assume that they are non-fatal */ 339 uclass_foreach_dev(dev, uc) { 340 ret = device_probe(dev); 341 if (ret) 342 printf("Failed to probe keyboard '%s'\n", dev->name); 343 } 344 #endif 345 #ifdef CONFIG_SYS_I2C 346 i2c_init_all(); 347 #else 348 #if defined(CONFIG_HARD_I2C) 349 i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); 350 #endif 351 #endif 352 #ifdef CONFIG_DM_VIDEO 353 /* 354 * If the console setting is not in environment variables then 355 * console_init_r() will not be calling iomux_doenv() (which calls 356 * search_device()). So we will not dynamically add devices by 357 * calling stdio_probe_device(). 358 * 359 * So just probe all video devices now so that whichever one is 360 * required will be available. 361 */ 362 #ifndef CONFIG_SYS_CONSOLE_IS_IN_ENV 363 struct udevice *vdev; 364 # ifndef CONFIG_DM_KEYBOARD 365 int ret; 366 # endif 367 368 for (ret = uclass_first_device(UCLASS_VIDEO, &vdev); 369 vdev; 370 ret = uclass_next_device(&vdev)) 371 ; 372 if (ret) 373 printf("%s: Video device failed (ret=%d)\n", __func__, ret); 374 #endif /* !CONFIG_SYS_CONSOLE_IS_IN_ENV */ 375 #else 376 # if defined(CONFIG_LCD) 377 drv_lcd_init (); 378 # endif 379 # if defined(CONFIG_VIDEO) || defined(CONFIG_CFB_CONSOLE) 380 drv_video_init (); 381 # endif 382 #endif /* CONFIG_DM_VIDEO */ 383 #if defined(CONFIG_KEYBOARD) && !defined(CONFIG_DM_KEYBOARD) 384 drv_keyboard_init (); 385 #endif 386 #ifdef CONFIG_LOGBUFFER 387 drv_logbuff_init (); 388 #endif 389 drv_system_init (); 390 serial_stdio_init (); 391 #ifdef CONFIG_USB_TTY 392 drv_usbtty_init (); 393 #endif 394 #ifdef CONFIG_NETCONSOLE 395 drv_nc_init (); 396 #endif 397 #ifdef CONFIG_JTAG_CONSOLE 398 drv_jtag_console_init (); 399 #endif 400 #ifdef CONFIG_CBMEM_CONSOLE 401 cbmemc_init(); 402 #endif 403 404 return 0; 405 } 406 407 int stdio_init(void) 408 { 409 stdio_init_tables(); 410 stdio_add_devices(); 411 412 return 0; 413 } 414