1*83d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+ 27742aa65SMarek Vasut /* 37742aa65SMarek Vasut * (C) Copyright 2004 47742aa65SMarek Vasut * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 57742aa65SMarek Vasut */ 67742aa65SMarek Vasut 77742aa65SMarek Vasut #include <common.h> 832057717SJoe Hershberger #include <environment.h> 97742aa65SMarek Vasut #include <serial.h> 107742aa65SMarek Vasut #include <stdio_dev.h> 117742aa65SMarek Vasut #include <post.h> 127742aa65SMarek Vasut #include <linux/compiler.h> 136d93e258SMarek Vasut #include <errno.h> 147742aa65SMarek Vasut 157742aa65SMarek Vasut DECLARE_GLOBAL_DATA_PTR; 167742aa65SMarek Vasut 177742aa65SMarek Vasut static struct serial_device *serial_devices; 187742aa65SMarek Vasut static struct serial_device *serial_current; 1932057717SJoe Hershberger /* 2032057717SJoe Hershberger * Table with supported baudrates (defined in config_xyz.h) 2132057717SJoe Hershberger */ 2232057717SJoe Hershberger static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE; 237742aa65SMarek Vasut 249cd2b9e4SMarek Vasut /** 259cd2b9e4SMarek Vasut * serial_null() - Void registration routine of a serial driver 269cd2b9e4SMarek Vasut * 279cd2b9e4SMarek Vasut * This routine implements a void registration routine of a serial 289cd2b9e4SMarek Vasut * driver. The registration routine of a particular driver is aliased 299cd2b9e4SMarek Vasut * to this empty function in case the driver is not compiled into 309cd2b9e4SMarek Vasut * U-Boot. 319cd2b9e4SMarek Vasut */ 327742aa65SMarek Vasut static void serial_null(void) 337742aa65SMarek Vasut { 347742aa65SMarek Vasut } 357742aa65SMarek Vasut 369cd2b9e4SMarek Vasut /** 3732057717SJoe Hershberger * on_baudrate() - Update the actual baudrate when the env var changes 3832057717SJoe Hershberger * 3932057717SJoe Hershberger * This will check for a valid baudrate and only apply it if valid. 4032057717SJoe Hershberger */ 4132057717SJoe Hershberger static int on_baudrate(const char *name, const char *value, enum env_op op, 4232057717SJoe Hershberger int flags) 4332057717SJoe Hershberger { 4432057717SJoe Hershberger int i; 4532057717SJoe Hershberger int baudrate; 4632057717SJoe Hershberger 4732057717SJoe Hershberger switch (op) { 4832057717SJoe Hershberger case env_op_create: 4932057717SJoe Hershberger case env_op_overwrite: 5032057717SJoe Hershberger /* 5132057717SJoe Hershberger * Switch to new baudrate if new baudrate is supported 5232057717SJoe Hershberger */ 5332057717SJoe Hershberger baudrate = simple_strtoul(value, NULL, 10); 5432057717SJoe Hershberger 5532057717SJoe Hershberger /* Not actually changing */ 5632057717SJoe Hershberger if (gd->baudrate == baudrate) 5732057717SJoe Hershberger return 0; 5832057717SJoe Hershberger 599935175fSAxel Lin for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) { 6032057717SJoe Hershberger if (baudrate == baudrate_table[i]) 6132057717SJoe Hershberger break; 6232057717SJoe Hershberger } 639935175fSAxel Lin if (i == ARRAY_SIZE(baudrate_table)) { 6432057717SJoe Hershberger if ((flags & H_FORCE) == 0) 6532057717SJoe Hershberger printf("## Baudrate %d bps not supported\n", 6632057717SJoe Hershberger baudrate); 6732057717SJoe Hershberger return 1; 6832057717SJoe Hershberger } 6932057717SJoe Hershberger if ((flags & H_INTERACTIVE) != 0) { 7032057717SJoe Hershberger printf("## Switch baudrate to %d" 7132057717SJoe Hershberger " bps and press ENTER ...\n", baudrate); 7232057717SJoe Hershberger udelay(50000); 7332057717SJoe Hershberger } 7432057717SJoe Hershberger 7532057717SJoe Hershberger gd->baudrate = baudrate; 7632057717SJoe Hershberger 7732057717SJoe Hershberger serial_setbrg(); 7832057717SJoe Hershberger 7932057717SJoe Hershberger udelay(50000); 8032057717SJoe Hershberger 8132057717SJoe Hershberger if ((flags & H_INTERACTIVE) != 0) 8232057717SJoe Hershberger while (1) { 8332057717SJoe Hershberger if (getc() == '\r') 8432057717SJoe Hershberger break; 8532057717SJoe Hershberger } 8632057717SJoe Hershberger 8732057717SJoe Hershberger return 0; 8832057717SJoe Hershberger case env_op_delete: 8932057717SJoe Hershberger printf("## Baudrate may not be deleted\n"); 9032057717SJoe Hershberger return 1; 9132057717SJoe Hershberger default: 9232057717SJoe Hershberger return 0; 9332057717SJoe Hershberger } 9432057717SJoe Hershberger } 9532057717SJoe Hershberger U_BOOT_ENV_CALLBACK(baudrate, on_baudrate); 9632057717SJoe Hershberger 9732057717SJoe Hershberger /** 989cd2b9e4SMarek Vasut * serial_initfunc() - Forward declare of driver registration routine 999cd2b9e4SMarek Vasut * @name: Name of the real driver registration routine. 1009cd2b9e4SMarek Vasut * 1019cd2b9e4SMarek Vasut * This macro expands onto forward declaration of a driver registration 1029cd2b9e4SMarek Vasut * routine, which is then used below in serial_initialize() function. 1039cd2b9e4SMarek Vasut * The declaration is made weak and aliases to serial_null() so in case 1049cd2b9e4SMarek Vasut * the driver is not compiled in, the function is still declared and can 1059cd2b9e4SMarek Vasut * be used, but aliases to serial_null() and thus is optimized away. 1069cd2b9e4SMarek Vasut */ 1077742aa65SMarek Vasut #define serial_initfunc(name) \ 1087742aa65SMarek Vasut void name(void) \ 1097742aa65SMarek Vasut __attribute__((weak, alias("serial_null"))); 1107742aa65SMarek Vasut 11194a255dfSJeroen Hofstee serial_initfunc(atmel_serial_initialize); 11294a255dfSJeroen Hofstee serial_initfunc(au1x00_serial_initialize); 11394a255dfSJeroen Hofstee serial_initfunc(mcf_serial_initialize); 1147742aa65SMarek Vasut serial_initfunc(mpc85xx_serial_initialize); 11594a255dfSJeroen Hofstee serial_initfunc(mpc8xx_serial_initialize); 1167742aa65SMarek Vasut serial_initfunc(mxc_serial_initialize); 11794a255dfSJeroen Hofstee serial_initfunc(ns16550_serial_initialize); 11894a255dfSJeroen Hofstee serial_initfunc(pl01x_serial_initialize); 11994a255dfSJeroen Hofstee serial_initfunc(pxa_serial_initialize); 12094a255dfSJeroen Hofstee serial_initfunc(sh_serial_initialize); 1217742aa65SMarek Vasut 1229cd2b9e4SMarek Vasut /** 1239cd2b9e4SMarek Vasut * serial_register() - Register serial driver with serial driver core 1249cd2b9e4SMarek Vasut * @dev: Pointer to the serial driver structure 1259cd2b9e4SMarek Vasut * 1269cd2b9e4SMarek Vasut * This function registers the serial driver supplied via @dev with 1279cd2b9e4SMarek Vasut * serial driver core, thus making U-Boot aware of it and making it 1289cd2b9e4SMarek Vasut * available for U-Boot to use. On platforms that still require manual 1299cd2b9e4SMarek Vasut * relocation of constant variables, relocation of the supplied structure 1309cd2b9e4SMarek Vasut * is performed. 1319cd2b9e4SMarek Vasut */ 1327742aa65SMarek Vasut void serial_register(struct serial_device *dev) 1337742aa65SMarek Vasut { 1347742aa65SMarek Vasut #ifdef CONFIG_NEEDS_MANUAL_RELOC 135f2760c4aSMarek Vasut if (dev->start) 1367742aa65SMarek Vasut dev->start += gd->reloc_off; 137f2760c4aSMarek Vasut if (dev->stop) 138f2760c4aSMarek Vasut dev->stop += gd->reloc_off; 139f2760c4aSMarek Vasut if (dev->setbrg) 1407742aa65SMarek Vasut dev->setbrg += gd->reloc_off; 141f2760c4aSMarek Vasut if (dev->getc) 1427742aa65SMarek Vasut dev->getc += gd->reloc_off; 143f2760c4aSMarek Vasut if (dev->tstc) 1447742aa65SMarek Vasut dev->tstc += gd->reloc_off; 145f2760c4aSMarek Vasut if (dev->putc) 1467742aa65SMarek Vasut dev->putc += gd->reloc_off; 147f2760c4aSMarek Vasut if (dev->puts) 1487742aa65SMarek Vasut dev->puts += gd->reloc_off; 1497742aa65SMarek Vasut #endif 1507742aa65SMarek Vasut 1517742aa65SMarek Vasut dev->next = serial_devices; 1527742aa65SMarek Vasut serial_devices = dev; 1537742aa65SMarek Vasut } 1547742aa65SMarek Vasut 1559cd2b9e4SMarek Vasut /** 1569cd2b9e4SMarek Vasut * serial_initialize() - Register all compiled-in serial port drivers 1579cd2b9e4SMarek Vasut * 1589cd2b9e4SMarek Vasut * This function registers all serial port drivers that are compiled 1599cd2b9e4SMarek Vasut * into the U-Boot binary with the serial core, thus making them 1609cd2b9e4SMarek Vasut * available to U-Boot to use. Lastly, this function assigns a default 1619cd2b9e4SMarek Vasut * serial port to the serial core. That serial port is then used as a 1629cd2b9e4SMarek Vasut * default output. 1639cd2b9e4SMarek Vasut */ 1647742aa65SMarek Vasut void serial_initialize(void) 1657742aa65SMarek Vasut { 16694a255dfSJeroen Hofstee atmel_serial_initialize(); 16794a255dfSJeroen Hofstee au1x00_serial_initialize(); 16894a255dfSJeroen Hofstee mcf_serial_initialize(); 1697742aa65SMarek Vasut mpc85xx_serial_initialize(); 17094a255dfSJeroen Hofstee mpc8xx_serial_initialize(); 1717742aa65SMarek Vasut mxc_serial_initialize(); 17294a255dfSJeroen Hofstee ns16550_serial_initialize(); 17394a255dfSJeroen Hofstee pl01x_serial_initialize(); 17494a255dfSJeroen Hofstee pxa_serial_initialize(); 17594a255dfSJeroen Hofstee sh_serial_initialize(); 1767742aa65SMarek Vasut 1777742aa65SMarek Vasut serial_assign(default_serial_console()->name); 1787742aa65SMarek Vasut } 1797742aa65SMarek Vasut 180654f8d0fSJeroen Hofstee static int serial_stub_start(struct stdio_dev *sdev) 181709ea543SSimon Glass { 182709ea543SSimon Glass struct serial_device *dev = sdev->priv; 183709ea543SSimon Glass 184709ea543SSimon Glass return dev->start(); 185709ea543SSimon Glass } 186709ea543SSimon Glass 187654f8d0fSJeroen Hofstee static int serial_stub_stop(struct stdio_dev *sdev) 188709ea543SSimon Glass { 189709ea543SSimon Glass struct serial_device *dev = sdev->priv; 190709ea543SSimon Glass 191709ea543SSimon Glass return dev->stop(); 192709ea543SSimon Glass } 193709ea543SSimon Glass 194654f8d0fSJeroen Hofstee static void serial_stub_putc(struct stdio_dev *sdev, const char ch) 195709ea543SSimon Glass { 196709ea543SSimon Glass struct serial_device *dev = sdev->priv; 197709ea543SSimon Glass 198709ea543SSimon Glass dev->putc(ch); 199709ea543SSimon Glass } 200709ea543SSimon Glass 201654f8d0fSJeroen Hofstee static void serial_stub_puts(struct stdio_dev *sdev, const char *str) 202709ea543SSimon Glass { 203709ea543SSimon Glass struct serial_device *dev = sdev->priv; 204709ea543SSimon Glass 205709ea543SSimon Glass dev->puts(str); 206709ea543SSimon Glass } 207709ea543SSimon Glass 20849ddcf3eSMasahiro Yamada static int serial_stub_getc(struct stdio_dev *sdev) 209709ea543SSimon Glass { 210709ea543SSimon Glass struct serial_device *dev = sdev->priv; 211709ea543SSimon Glass 212709ea543SSimon Glass return dev->getc(); 213709ea543SSimon Glass } 214709ea543SSimon Glass 21549ddcf3eSMasahiro Yamada static int serial_stub_tstc(struct stdio_dev *sdev) 216709ea543SSimon Glass { 217709ea543SSimon Glass struct serial_device *dev = sdev->priv; 218709ea543SSimon Glass 219709ea543SSimon Glass return dev->tstc(); 220709ea543SSimon Glass } 221709ea543SSimon Glass 2229cd2b9e4SMarek Vasut /** 2239cd2b9e4SMarek Vasut * serial_stdio_init() - Register serial ports with STDIO core 2249cd2b9e4SMarek Vasut * 2259cd2b9e4SMarek Vasut * This function generates a proxy driver for each serial port driver. 2269cd2b9e4SMarek Vasut * These proxy drivers then register with the STDIO core, making the 2279cd2b9e4SMarek Vasut * serial drivers available as STDIO devices. 2289cd2b9e4SMarek Vasut */ 2297742aa65SMarek Vasut void serial_stdio_init(void) 2307742aa65SMarek Vasut { 2317742aa65SMarek Vasut struct stdio_dev dev; 2327742aa65SMarek Vasut struct serial_device *s = serial_devices; 2337742aa65SMarek Vasut 2347742aa65SMarek Vasut while (s) { 2357742aa65SMarek Vasut memset(&dev, 0, sizeof(dev)); 2367742aa65SMarek Vasut 2377742aa65SMarek Vasut strcpy(dev.name, s->name); 2387742aa65SMarek Vasut dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; 2397742aa65SMarek Vasut 240709ea543SSimon Glass dev.start = serial_stub_start; 241709ea543SSimon Glass dev.stop = serial_stub_stop; 242709ea543SSimon Glass dev.putc = serial_stub_putc; 243709ea543SSimon Glass dev.puts = serial_stub_puts; 244709ea543SSimon Glass dev.getc = serial_stub_getc; 245709ea543SSimon Glass dev.tstc = serial_stub_tstc; 246addf9513SSimon Glass dev.priv = s; 2477742aa65SMarek Vasut 2487742aa65SMarek Vasut stdio_register(&dev); 2497742aa65SMarek Vasut 2507742aa65SMarek Vasut s = s->next; 2517742aa65SMarek Vasut } 2527742aa65SMarek Vasut } 2537742aa65SMarek Vasut 2549cd2b9e4SMarek Vasut /** 2559cd2b9e4SMarek Vasut * serial_assign() - Select the serial output device by name 2569cd2b9e4SMarek Vasut * @name: Name of the serial driver to be used as default output 2579cd2b9e4SMarek Vasut * 2589cd2b9e4SMarek Vasut * This function configures the serial output multiplexing by 2599cd2b9e4SMarek Vasut * selecting which serial device will be used as default. In case 2609cd2b9e4SMarek Vasut * the STDIO "serial" device is selected as stdin/stdout/stderr, 2619cd2b9e4SMarek Vasut * the serial device previously configured by this function will be 2629cd2b9e4SMarek Vasut * used for the particular operation. 2639cd2b9e4SMarek Vasut * 2649cd2b9e4SMarek Vasut * Returns 0 on success, negative on error. 2659cd2b9e4SMarek Vasut */ 2667742aa65SMarek Vasut int serial_assign(const char *name) 2677742aa65SMarek Vasut { 2687742aa65SMarek Vasut struct serial_device *s; 2697742aa65SMarek Vasut 2707742aa65SMarek Vasut for (s = serial_devices; s; s = s->next) { 2716d93e258SMarek Vasut if (strcmp(s->name, name)) 2726d93e258SMarek Vasut continue; 2737742aa65SMarek Vasut serial_current = s; 2747742aa65SMarek Vasut return 0; 2757742aa65SMarek Vasut } 2767742aa65SMarek Vasut 2776d93e258SMarek Vasut return -EINVAL; 2787742aa65SMarek Vasut } 2797742aa65SMarek Vasut 2809cd2b9e4SMarek Vasut /** 2819cd2b9e4SMarek Vasut * serial_reinit_all() - Reinitialize all compiled-in serial ports 2829cd2b9e4SMarek Vasut * 2839cd2b9e4SMarek Vasut * This function reinitializes all serial ports that are compiled 2849cd2b9e4SMarek Vasut * into U-Boot by calling their serial_start() functions. 2859cd2b9e4SMarek Vasut */ 2867742aa65SMarek Vasut void serial_reinit_all(void) 2877742aa65SMarek Vasut { 2887742aa65SMarek Vasut struct serial_device *s; 2897742aa65SMarek Vasut 2907742aa65SMarek Vasut for (s = serial_devices; s; s = s->next) 2917742aa65SMarek Vasut s->start(); 2927742aa65SMarek Vasut } 2937742aa65SMarek Vasut 2949cd2b9e4SMarek Vasut /** 2959cd2b9e4SMarek Vasut * get_current() - Return pointer to currently selected serial port 2969cd2b9e4SMarek Vasut * 2979cd2b9e4SMarek Vasut * This function returns a pointer to currently selected serial port. 2989cd2b9e4SMarek Vasut * The currently selected serial port is altered by serial_assign() 2999cd2b9e4SMarek Vasut * function. 3009cd2b9e4SMarek Vasut * 3019cd2b9e4SMarek Vasut * In case this function is called before relocation or before any serial 3029cd2b9e4SMarek Vasut * port is configured, this function calls default_serial_console() to 3039cd2b9e4SMarek Vasut * determine the serial port. Otherwise, the configured serial port is 3049cd2b9e4SMarek Vasut * returned. 3059cd2b9e4SMarek Vasut * 3069cd2b9e4SMarek Vasut * Returns pointer to the currently selected serial port on success, 3079cd2b9e4SMarek Vasut * NULL on error. 3089cd2b9e4SMarek Vasut */ 3097742aa65SMarek Vasut static struct serial_device *get_current(void) 3107742aa65SMarek Vasut { 3117742aa65SMarek Vasut struct serial_device *dev; 3127742aa65SMarek Vasut 313dee19416SMarek Vasut if (!(gd->flags & GD_FLG_RELOC)) 3147742aa65SMarek Vasut dev = default_serial_console(); 315dee19416SMarek Vasut else if (!serial_current) 316dee19416SMarek Vasut dev = default_serial_console(); 317dee19416SMarek Vasut else 318dee19416SMarek Vasut dev = serial_current; 3197742aa65SMarek Vasut 3207742aa65SMarek Vasut /* We must have a console device */ 3217742aa65SMarek Vasut if (!dev) { 3227742aa65SMarek Vasut #ifdef CONFIG_SPL_BUILD 3237742aa65SMarek Vasut puts("Cannot find console\n"); 3247742aa65SMarek Vasut hang(); 3257742aa65SMarek Vasut #else 3267742aa65SMarek Vasut panic("Cannot find console\n"); 3277742aa65SMarek Vasut #endif 3287742aa65SMarek Vasut } 329dee19416SMarek Vasut 3307742aa65SMarek Vasut return dev; 3317742aa65SMarek Vasut } 3327742aa65SMarek Vasut 3339cd2b9e4SMarek Vasut /** 3349cd2b9e4SMarek Vasut * serial_init() - Initialize currently selected serial port 3359cd2b9e4SMarek Vasut * 3369cd2b9e4SMarek Vasut * This function initializes the currently selected serial port. This 3379cd2b9e4SMarek Vasut * usually involves setting up the registers of that particular port, 3389cd2b9e4SMarek Vasut * enabling clock and such. This function uses the get_current() call 3399cd2b9e4SMarek Vasut * to determine which port is selected. 3409cd2b9e4SMarek Vasut * 3419cd2b9e4SMarek Vasut * Returns 0 on success, negative on error. 3429cd2b9e4SMarek Vasut */ 3437742aa65SMarek Vasut int serial_init(void) 3447742aa65SMarek Vasut { 345093f79abSSimon Glass gd->flags |= GD_FLG_SERIAL_READY; 3467742aa65SMarek Vasut return get_current()->start(); 3477742aa65SMarek Vasut } 3487742aa65SMarek Vasut 3499cd2b9e4SMarek Vasut /** 3509cd2b9e4SMarek Vasut * serial_setbrg() - Configure baud-rate of currently selected serial port 3519cd2b9e4SMarek Vasut * 3529cd2b9e4SMarek Vasut * This function configures the baud-rate of the currently selected 3539cd2b9e4SMarek Vasut * serial port. The baud-rate is retrieved from global data within 3549cd2b9e4SMarek Vasut * the serial port driver. This function uses the get_current() call 3559cd2b9e4SMarek Vasut * to determine which port is selected. 3569cd2b9e4SMarek Vasut * 3579cd2b9e4SMarek Vasut * Returns 0 on success, negative on error. 3589cd2b9e4SMarek Vasut */ 3597742aa65SMarek Vasut void serial_setbrg(void) 3607742aa65SMarek Vasut { 3617742aa65SMarek Vasut get_current()->setbrg(); 3627742aa65SMarek Vasut } 3637742aa65SMarek Vasut 3649cd2b9e4SMarek Vasut /** 3659cd2b9e4SMarek Vasut * serial_getc() - Read character from currently selected serial port 3669cd2b9e4SMarek Vasut * 3679cd2b9e4SMarek Vasut * This function retrieves a character from currently selected serial 3689cd2b9e4SMarek Vasut * port. In case there is no character waiting on the serial port, 3699cd2b9e4SMarek Vasut * this function will block and wait for the character to appear. This 3709cd2b9e4SMarek Vasut * function uses the get_current() call to determine which port is 3719cd2b9e4SMarek Vasut * selected. 3729cd2b9e4SMarek Vasut * 3739cd2b9e4SMarek Vasut * Returns the character on success, negative on error. 3749cd2b9e4SMarek Vasut */ 3757742aa65SMarek Vasut int serial_getc(void) 3767742aa65SMarek Vasut { 3777742aa65SMarek Vasut return get_current()->getc(); 3787742aa65SMarek Vasut } 3797742aa65SMarek Vasut 3809cd2b9e4SMarek Vasut /** 3819cd2b9e4SMarek Vasut * serial_tstc() - Test if data is available on currently selected serial port 3829cd2b9e4SMarek Vasut * 3839cd2b9e4SMarek Vasut * This function tests if one or more characters are available on 3849cd2b9e4SMarek Vasut * currently selected serial port. This function never blocks. This 3859cd2b9e4SMarek Vasut * function uses the get_current() call to determine which port is 3869cd2b9e4SMarek Vasut * selected. 3879cd2b9e4SMarek Vasut * 3889cd2b9e4SMarek Vasut * Returns positive if character is available, zero otherwise. 3899cd2b9e4SMarek Vasut */ 3907742aa65SMarek Vasut int serial_tstc(void) 3917742aa65SMarek Vasut { 3927742aa65SMarek Vasut return get_current()->tstc(); 3937742aa65SMarek Vasut } 3947742aa65SMarek Vasut 3959cd2b9e4SMarek Vasut /** 3969cd2b9e4SMarek Vasut * serial_putc() - Output character via currently selected serial port 3979cd2b9e4SMarek Vasut * @c: Single character to be output from the serial port. 3989cd2b9e4SMarek Vasut * 3999cd2b9e4SMarek Vasut * This function outputs a character via currently selected serial 4009cd2b9e4SMarek Vasut * port. This character is passed to the serial port driver responsible 4019cd2b9e4SMarek Vasut * for controlling the hardware. The hardware may still be in process 4029cd2b9e4SMarek Vasut * of transmitting another character, therefore this function may block 4039cd2b9e4SMarek Vasut * for a short amount of time. This function uses the get_current() 4049cd2b9e4SMarek Vasut * call to determine which port is selected. 4059cd2b9e4SMarek Vasut */ 4067742aa65SMarek Vasut void serial_putc(const char c) 4077742aa65SMarek Vasut { 4087742aa65SMarek Vasut get_current()->putc(c); 4097742aa65SMarek Vasut } 4107742aa65SMarek Vasut 4119cd2b9e4SMarek Vasut /** 4129cd2b9e4SMarek Vasut * serial_puts() - Output string via currently selected serial port 4139cd2b9e4SMarek Vasut * @s: Zero-terminated string to be output from the serial port. 4149cd2b9e4SMarek Vasut * 4159cd2b9e4SMarek Vasut * This function outputs a zero-terminated string via currently 4169cd2b9e4SMarek Vasut * selected serial port. This function behaves as an accelerator 4179cd2b9e4SMarek Vasut * in case the hardware can queue multiple characters for transfer. 4189cd2b9e4SMarek Vasut * The whole string that is to be output is available to the function 4199cd2b9e4SMarek Vasut * implementing the hardware manipulation. Transmitting the whole 4209cd2b9e4SMarek Vasut * string may take some time, thus this function may block for some 4219cd2b9e4SMarek Vasut * amount of time. This function uses the get_current() call to 4229cd2b9e4SMarek Vasut * determine which port is selected. 4239cd2b9e4SMarek Vasut */ 4247742aa65SMarek Vasut void serial_puts(const char *s) 4257742aa65SMarek Vasut { 4267742aa65SMarek Vasut get_current()->puts(s); 4277742aa65SMarek Vasut } 4287742aa65SMarek Vasut 4299cd2b9e4SMarek Vasut /** 4309cd2b9e4SMarek Vasut * default_serial_puts() - Output string by calling serial_putc() in loop 4319cd2b9e4SMarek Vasut * @s: Zero-terminated string to be output from the serial port. 4329cd2b9e4SMarek Vasut * 4339cd2b9e4SMarek Vasut * This function outputs a zero-terminated string by calling serial_putc() 4349cd2b9e4SMarek Vasut * in a loop. Most drivers do not support queueing more than one byte for 4359cd2b9e4SMarek Vasut * transfer, thus this function precisely implements their serial_puts(). 4369cd2b9e4SMarek Vasut * 4379cd2b9e4SMarek Vasut * To optimize the number of get_current() calls, this function only 4389cd2b9e4SMarek Vasut * calls get_current() once and then directly accesses the putc() call 4399cd2b9e4SMarek Vasut * of the &struct serial_device . 4409cd2b9e4SMarek Vasut */ 441bfb7d7a3SMarek Vasut void default_serial_puts(const char *s) 442bfb7d7a3SMarek Vasut { 443bfb7d7a3SMarek Vasut struct serial_device *dev = get_current(); 444bfb7d7a3SMarek Vasut while (*s) 445bfb7d7a3SMarek Vasut dev->putc(*s++); 446bfb7d7a3SMarek Vasut } 447bfb7d7a3SMarek Vasut 4487742aa65SMarek Vasut #if CONFIG_POST & CONFIG_SYS_POST_UART 4497742aa65SMarek Vasut static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE; 4507742aa65SMarek Vasut 4519cd2b9e4SMarek Vasut /** 4529cd2b9e4SMarek Vasut * uart_post_test() - Test the currently selected serial port using POST 4539cd2b9e4SMarek Vasut * @flags: POST framework flags 4549cd2b9e4SMarek Vasut * 4559cd2b9e4SMarek Vasut * Do a loopback test of the currently selected serial port. This 4569cd2b9e4SMarek Vasut * function is only useful in the context of the POST testing framwork. 4571b25e586SVagrant Cascadian * The serial port is first configured into loopback mode and then 4589cd2b9e4SMarek Vasut * characters are sent through it. 4599cd2b9e4SMarek Vasut * 4609cd2b9e4SMarek Vasut * Returns 0 on success, value otherwise. 4619cd2b9e4SMarek Vasut */ 4627742aa65SMarek Vasut /* Mark weak until post/cpu/.../uart.c migrate over */ 4637742aa65SMarek Vasut __weak 4647742aa65SMarek Vasut int uart_post_test(int flags) 4657742aa65SMarek Vasut { 4667742aa65SMarek Vasut unsigned char c; 4677742aa65SMarek Vasut int ret, saved_baud, b; 4687742aa65SMarek Vasut struct serial_device *saved_dev, *s; 4697742aa65SMarek Vasut 4707742aa65SMarek Vasut /* Save current serial state */ 4717742aa65SMarek Vasut ret = 0; 4727742aa65SMarek Vasut saved_dev = serial_current; 4738e261575SMasahiro Yamada saved_baud = gd->baudrate; 4747742aa65SMarek Vasut 4757742aa65SMarek Vasut for (s = serial_devices; s; s = s->next) { 4767742aa65SMarek Vasut /* If this driver doesn't support loop back, skip it */ 4777742aa65SMarek Vasut if (!s->loop) 4787742aa65SMarek Vasut continue; 4797742aa65SMarek Vasut 4807742aa65SMarek Vasut /* Test the next device */ 4817742aa65SMarek Vasut serial_current = s; 4827742aa65SMarek Vasut 4837742aa65SMarek Vasut ret = serial_init(); 4847742aa65SMarek Vasut if (ret) 4857742aa65SMarek Vasut goto done; 4867742aa65SMarek Vasut 4877742aa65SMarek Vasut /* Consume anything that happens to be queued */ 4887742aa65SMarek Vasut while (serial_tstc()) 4897742aa65SMarek Vasut serial_getc(); 4907742aa65SMarek Vasut 4917742aa65SMarek Vasut /* Enable loop back */ 4927742aa65SMarek Vasut s->loop(1); 4937742aa65SMarek Vasut 4947742aa65SMarek Vasut /* Test every available baud rate */ 4957742aa65SMarek Vasut for (b = 0; b < ARRAY_SIZE(bauds); ++b) { 4968e261575SMasahiro Yamada gd->baudrate = bauds[b]; 4977742aa65SMarek Vasut serial_setbrg(); 4987742aa65SMarek Vasut 4997742aa65SMarek Vasut /* 5007742aa65SMarek Vasut * Stick to printable chars to avoid issues: 5017742aa65SMarek Vasut * - terminal corruption 5027742aa65SMarek Vasut * - serial program reacting to sequences and sending 5037742aa65SMarek Vasut * back random extra data 5047742aa65SMarek Vasut * - most serial drivers add in extra chars (like \r\n) 5057742aa65SMarek Vasut */ 5067742aa65SMarek Vasut for (c = 0x20; c < 0x7f; ++c) { 5077742aa65SMarek Vasut /* Send it out */ 5087742aa65SMarek Vasut serial_putc(c); 5097742aa65SMarek Vasut 5107742aa65SMarek Vasut /* Make sure it's the same one */ 5117742aa65SMarek Vasut ret = (c != serial_getc()); 5127742aa65SMarek Vasut if (ret) { 5137742aa65SMarek Vasut s->loop(0); 5147742aa65SMarek Vasut goto done; 5157742aa65SMarek Vasut } 5167742aa65SMarek Vasut 5177742aa65SMarek Vasut /* Clean up the output in case it was sent */ 5187742aa65SMarek Vasut serial_putc('\b'); 5197742aa65SMarek Vasut ret = ('\b' != serial_getc()); 5207742aa65SMarek Vasut if (ret) { 5217742aa65SMarek Vasut s->loop(0); 5227742aa65SMarek Vasut goto done; 5237742aa65SMarek Vasut } 5247742aa65SMarek Vasut } 5257742aa65SMarek Vasut } 5267742aa65SMarek Vasut 5277742aa65SMarek Vasut /* Disable loop back */ 5287742aa65SMarek Vasut s->loop(0); 5297742aa65SMarek Vasut 5307742aa65SMarek Vasut /* XXX: There is no serial_stop() !? */ 5317742aa65SMarek Vasut if (s->stop) 5327742aa65SMarek Vasut s->stop(); 5337742aa65SMarek Vasut } 5347742aa65SMarek Vasut 5357742aa65SMarek Vasut done: 5367742aa65SMarek Vasut /* Restore previous serial state */ 5377742aa65SMarek Vasut serial_current = saved_dev; 5388e261575SMasahiro Yamada gd->baudrate = saved_baud; 5397742aa65SMarek Vasut serial_reinit_all(); 5407742aa65SMarek Vasut serial_setbrg(); 5417742aa65SMarek Vasut 5427742aa65SMarek Vasut return ret; 5437742aa65SMarek Vasut } 5447742aa65SMarek Vasut #endif 545