1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net> 4 * 5 * Changes for multibus/multiadapter I2C support. 6 * 7 * (C) Copyright 2000 8 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it 9 */ 10 11#include <config.h> 12#include <common.h> 13#include <dm.h> 14#include <errno.h> 15#include <log.h> 16#include <stdarg.h> 17#include <malloc.h> 18#include <stdio_dev.h> 19#include <serial.h> 20#include <splash.h> 21#include <i2c.h> 22#include <asm/global_data.h> 23#include <dm/device-internal.h> 24 25DECLARE_GLOBAL_DATA_PTR; 26 27static struct stdio_dev devs; 28struct stdio_dev *stdio_devices[] = { NULL, NULL, NULL }; 29char *stdio_names[MAX_FILES] = { "stdin", "stdout", "stderr" }; 30 31int stdio_file_to_flags(const int file) 32{ 33 switch (file) { 34 case stdin: 35 return DEV_FLAGS_INPUT; 36 case stdout: 37 case stderr: 38 return DEV_FLAGS_OUTPUT; 39 default: 40 return -EINVAL; 41 } 42} 43 44#if CONFIG_IS_ENABLED(SYS_DEVICE_NULLDEV) 45static void nulldev_putc(struct stdio_dev *dev, const char c) 46{ 47 /* nulldev is empty! */ 48} 49 50static void nulldev_puts(struct stdio_dev *dev, const char *s) 51{ 52 /* nulldev is empty! */ 53} 54 55static int nulldev_input(struct stdio_dev *dev) 56{ 57 /* nulldev is empty! */ 58 return 0; 59} 60 61static void nulldev_register(void) 62{ 63 struct stdio_dev dev; 64 65 memset(&dev, '\0', sizeof(dev)); 66 67 strcpy(dev.name, "nulldev"); 68 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; 69 dev.putc = nulldev_putc; 70 dev.puts = nulldev_puts; 71 dev.getc = nulldev_input; 72 dev.tstc = nulldev_input; 73 74 stdio_register(&dev); 75} 76#else 77static inline void nulldev_register(void) {} 78#endif /* SYS_DEVICE_NULLDEV */ 79 80static void stdio_serial_putc(struct stdio_dev *dev, const char c) 81{ 82 serial_putc(c); 83} 84 85static void stdio_serial_puts(struct stdio_dev *dev, const char *s) 86{ 87 serial_puts(s); 88} 89 90#ifdef CONFIG_CONSOLE_FLUSH_SUPPORT 91static void stdio_serial_flush(struct stdio_dev *dev) 92{ 93 serial_flush(); 94} 95#endif 96 97static int stdio_serial_getc(struct stdio_dev *dev) 98{ 99 return serial_getc(); 100} 101 102static int stdio_serial_tstc(struct stdio_dev *dev) 103{ 104 return serial_tstc(); 105} 106 107/************************************************************************** 108 * SYSTEM DRIVERS 109 ************************************************************************** 110 */ 111 112static void drv_system_init (void) 113{ 114 struct stdio_dev dev; 115 116 memset (&dev, 0, sizeof (dev)); 117 118 strcpy (dev.name, "serial"); 119 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; 120 dev.putc = stdio_serial_putc; 121 dev.puts = stdio_serial_puts; 122 STDIO_DEV_ASSIGN_FLUSH(&dev, stdio_serial_flush); 123 dev.getc = stdio_serial_getc; 124 dev.tstc = stdio_serial_tstc; 125 stdio_register (&dev); 126 127 nulldev_register(); 128} 129 130/************************************************************************** 131 * DEVICES 132 ************************************************************************** 133 */ 134struct list_head* stdio_get_list(void) 135{ 136 return &devs.list; 137} 138 139/** 140 * stdio_probe_device() - Find a device which provides the given stdio device 141 * 142 * This looks for a device of the given uclass which provides a particular 143 * stdio device. It is currently really only useful for UCLASS_VIDEO. 144 * 145 * Ultimately we want to be able to probe a device by its stdio name. At 146 * present devices register in their probe function (for video devices this 147 * is done in vidconsole_post_probe()) and we don't know what name they will 148 * use until they do so. 149 * TODO(sjg@chromium.org): We should be able to determine the name before 150 * probing, and probe the required device. 151 * 152 * @name: stdio device name (e.g. "vidconsole") 153 * id: Uclass ID of device to look for (e.g. UCLASS_VIDEO) 154 * @sdevp: Returns stdout device, if found, else NULL 155 * Return: 0 if found, -ENOENT if no device found with that name, other -ve 156 * on other error 157 */ 158static int stdio_probe_device(const char *name, enum uclass_id id, 159 struct stdio_dev **sdevp) 160{ 161 struct stdio_dev *sdev; 162 struct udevice *dev; 163 int seq, ret; 164 165 *sdevp = NULL; 166 seq = trailing_strtoln(name, NULL); 167 if (seq == -1) 168 seq = 0; 169 ret = uclass_get_device_by_seq(id, seq, &dev); 170 if (ret == -ENODEV) 171 ret = uclass_first_device_err(id, &dev); 172 if (ret) { 173 debug("No %s device for seq %d (%s)\n", uclass_get_name(id), 174 seq, name); 175 return ret; 176 } 177 /* The device should be be the last one registered */ 178 sdev = list_empty(&devs.list) ? NULL : 179 list_last_entry(&devs.list, struct stdio_dev, list); 180 if (!sdev || strcmp(sdev->name, name)) { 181 debug("Device '%s' did not register with stdio as '%s'\n", 182 dev->name, name); 183 return -ENOENT; 184 } 185 *sdevp = sdev; 186 187 return 0; 188} 189 190struct stdio_dev *stdio_get_by_name(const char *name) 191{ 192 struct list_head *pos; 193 struct stdio_dev *sdev; 194 195 if (!name) 196 return NULL; 197 198 list_for_each(pos, &devs.list) { 199 sdev = list_entry(pos, struct stdio_dev, list); 200 if (strcmp(sdev->name, name) == 0) 201 return sdev; 202 } 203 if (IS_ENABLED(CONFIG_VIDEO)) { 204 /* 205 * We did not find a suitable stdio device. If there is a video 206 * driver with a name starting with 'vidconsole', we can try 207 * probing that in the hope that it will produce the required 208 * stdio device. 209 * 210 * This function is sometimes called with the entire value of 211 * 'stdout', which may include a list of devices separate by 212 * commas. Obviously this is not going to work, so we ignore 213 * that case. The call path in that case is 214 * console_init_r() -> console_search_dev() -> stdio_get_by_name() 215 */ 216 if (!strncmp(name, "vidconsole", 10) && !strchr(name, ',') && 217 !stdio_probe_device(name, UCLASS_VIDEO, &sdev)) 218 return sdev; 219 } 220 221 return NULL; 222} 223 224struct stdio_dev *stdio_clone(struct stdio_dev *dev) 225{ 226 struct stdio_dev *_dev; 227 228 if (!dev) 229 return NULL; 230 231 _dev = calloc(1, sizeof(struct stdio_dev)); 232 if (!_dev) 233 return NULL; 234 235 memcpy(_dev, dev, sizeof(struct stdio_dev)); 236 237 return _dev; 238} 239 240int stdio_register_dev(struct stdio_dev *dev, struct stdio_dev **devp) 241{ 242 struct stdio_dev *_dev; 243 244 _dev = stdio_clone(dev); 245 if (!_dev) 246 return -ENODEV; 247 list_add_tail(&_dev->list, &devs.list); 248 if (devp) 249 *devp = _dev; 250 251 return 0; 252} 253 254int stdio_register(struct stdio_dev *dev) 255{ 256 return stdio_register_dev(dev, NULL); 257} 258 259int stdio_deregister_dev(struct stdio_dev *dev, int force) 260{ 261 struct list_head *pos; 262 char temp_names[3][STDIO_NAME_LEN]; 263 int i; 264 265 /* get stdio devices (ListRemoveItem changes the dev list) */ 266 for (i = 0 ; i < MAX_FILES; i++) { 267 if (stdio_devices[i] == dev) { 268 if (force) { 269 strcpy(temp_names[i], "nulldev"); 270 continue; 271 } 272 /* Device is assigned -> report error */ 273 return -EBUSY; 274 } 275 strlcpy(&temp_names[i][0], stdio_devices[i]->name, 276 sizeof(temp_names[i])); 277 } 278 279 list_del(&dev->list); 280 free(dev); 281 282 /* reassign device list */ 283 list_for_each(pos, &devs.list) { 284 dev = list_entry(pos, struct stdio_dev, list); 285 for (i = 0 ; i < MAX_FILES; i++) { 286 if (strcmp(dev->name, temp_names[i]) == 0) 287 stdio_devices[i] = dev; 288 } 289 } 290 291 return 0; 292} 293 294int stdio_init_tables(void) 295{ 296 /* Initialize the list */ 297 INIT_LIST_HEAD(&devs.list); 298 299 return 0; 300} 301 302int stdio_add_devices(void) 303{ 304 struct udevice *dev; 305 int ret; 306 307 if (IS_ENABLED(CONFIG_DM_KEYBOARD)) { 308 /* 309 * For now we probe all the devices here. At some point this 310 * should be done only when the devices are required - e.g. we 311 * have a list of input devices to start up in the stdin 312 * environment variable. That work probably makes more sense 313 * when stdio itself is converted to driver model. 314 */ 315 316 /* 317 * Don't report errors to the caller - assume that they are 318 * non-fatal 319 */ 320 for (ret = uclass_first_device_check(UCLASS_KEYBOARD, &dev); 321 dev; 322 ret = uclass_next_device_check(&dev)) { 323 if (ret) 324 printf("%s: Failed to probe keyboard '%s' (ret=%d)\n", 325 __func__, dev->name, ret); 326 } 327 } 328#if CONFIG_IS_ENABLED(SYS_I2C_LEGACY) 329 i2c_init_all(); 330#endif 331 if (IS_ENABLED(CONFIG_VIDEO)) { 332 /* 333 * If the console setting is not in environment variables then 334 * console_init_r() will not be calling iomux_doenv() (which 335 * calls console_search_dev()). So we will not dynamically add 336 * devices by calling stdio_probe_device(). 337 * 338 * So just probe all video devices now so that whichever one is 339 * required will be available. 340 */ 341 struct udevice *vdev; 342 int ret; 343 344 if (!IS_ENABLED(CONFIG_SYS_CONSOLE_IS_IN_ENV)) { 345 for (ret = uclass_first_device_check(UCLASS_VIDEO, 346 &vdev); 347 vdev; 348 ret = uclass_next_device_check(&vdev)) { 349 if (ret) 350 printf("%s: Failed to probe video device '%s' (ret=%d)\n", 351 __func__, vdev->name, ret); 352 } 353 } 354 if (IS_ENABLED(CONFIG_SPLASH_SCREEN) && 355 IS_ENABLED(CONFIG_CMD_BMP)) 356 splash_display(); 357 } 358 359 drv_system_init(); 360 serial_stdio_init(); 361#ifdef CONFIG_USB_TTY 362 drv_usbtty_init(); 363#endif 364#ifdef CONFIG_USB_FUNCTION_ACM 365 drv_usbacm_init (); 366#endif 367 if (IS_ENABLED(CONFIG_NETCONSOLE)) 368 drv_nc_init(); 369#ifdef CONFIG_JTAG_CONSOLE 370 drv_jtag_console_init(); 371#endif 372 if (IS_ENABLED(CONFIG_CBMEM_CONSOLE)) 373 cbmemc_init(); 374 375 return 0; 376} 377