17742aa65SMarek Vasut /* 27742aa65SMarek Vasut * (C) Copyright 2004 37742aa65SMarek Vasut * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 47742aa65SMarek Vasut * 51a459660SWolfgang Denk * SPDX-License-Identifier: GPL-2.0+ 67742aa65SMarek Vasut */ 77742aa65SMarek Vasut 87742aa65SMarek Vasut #include <common.h> 932057717SJoe Hershberger #include <environment.h> 107742aa65SMarek Vasut #include <serial.h> 117742aa65SMarek Vasut #include <stdio_dev.h> 127742aa65SMarek Vasut #include <post.h> 137742aa65SMarek Vasut #include <linux/compiler.h> 146d93e258SMarek Vasut #include <errno.h> 157742aa65SMarek Vasut 167742aa65SMarek Vasut DECLARE_GLOBAL_DATA_PTR; 177742aa65SMarek Vasut 187742aa65SMarek Vasut static struct serial_device *serial_devices; 197742aa65SMarek Vasut static struct serial_device *serial_current; 2032057717SJoe Hershberger /* 2132057717SJoe Hershberger * Table with supported baudrates (defined in config_xyz.h) 2232057717SJoe Hershberger */ 2332057717SJoe Hershberger static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE; 247742aa65SMarek Vasut 259cd2b9e4SMarek Vasut /** 269cd2b9e4SMarek Vasut * serial_null() - Void registration routine of a serial driver 279cd2b9e4SMarek Vasut * 289cd2b9e4SMarek Vasut * This routine implements a void registration routine of a serial 299cd2b9e4SMarek Vasut * driver. The registration routine of a particular driver is aliased 309cd2b9e4SMarek Vasut * to this empty function in case the driver is not compiled into 319cd2b9e4SMarek Vasut * U-Boot. 329cd2b9e4SMarek Vasut */ 337742aa65SMarek Vasut static void serial_null(void) 347742aa65SMarek Vasut { 357742aa65SMarek Vasut } 367742aa65SMarek Vasut 379cd2b9e4SMarek Vasut /** 3832057717SJoe Hershberger * on_baudrate() - Update the actual baudrate when the env var changes 3932057717SJoe Hershberger * 4032057717SJoe Hershberger * This will check for a valid baudrate and only apply it if valid. 4132057717SJoe Hershberger */ 4232057717SJoe Hershberger static int on_baudrate(const char *name, const char *value, enum env_op op, 4332057717SJoe Hershberger int flags) 4432057717SJoe Hershberger { 4532057717SJoe Hershberger int i; 4632057717SJoe Hershberger int baudrate; 4732057717SJoe Hershberger 4832057717SJoe Hershberger switch (op) { 4932057717SJoe Hershberger case env_op_create: 5032057717SJoe Hershberger case env_op_overwrite: 5132057717SJoe Hershberger /* 5232057717SJoe Hershberger * Switch to new baudrate if new baudrate is supported 5332057717SJoe Hershberger */ 5432057717SJoe Hershberger baudrate = simple_strtoul(value, NULL, 10); 5532057717SJoe Hershberger 5632057717SJoe Hershberger /* Not actually changing */ 5732057717SJoe Hershberger if (gd->baudrate == baudrate) 5832057717SJoe Hershberger return 0; 5932057717SJoe Hershberger 609935175fSAxel Lin for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) { 6132057717SJoe Hershberger if (baudrate == baudrate_table[i]) 6232057717SJoe Hershberger break; 6332057717SJoe Hershberger } 649935175fSAxel Lin if (i == ARRAY_SIZE(baudrate_table)) { 6532057717SJoe Hershberger if ((flags & H_FORCE) == 0) 6632057717SJoe Hershberger printf("## Baudrate %d bps not supported\n", 6732057717SJoe Hershberger baudrate); 6832057717SJoe Hershberger return 1; 6932057717SJoe Hershberger } 7032057717SJoe Hershberger if ((flags & H_INTERACTIVE) != 0) { 7132057717SJoe Hershberger printf("## Switch baudrate to %d" 7232057717SJoe Hershberger " bps and press ENTER ...\n", baudrate); 7332057717SJoe Hershberger udelay(50000); 7432057717SJoe Hershberger } 7532057717SJoe Hershberger 7632057717SJoe Hershberger gd->baudrate = baudrate; 7732057717SJoe Hershberger 7832057717SJoe Hershberger serial_setbrg(); 7932057717SJoe Hershberger 8032057717SJoe Hershberger udelay(50000); 8132057717SJoe Hershberger 8232057717SJoe Hershberger if ((flags & H_INTERACTIVE) != 0) 8332057717SJoe Hershberger while (1) { 8432057717SJoe Hershberger if (getc() == '\r') 8532057717SJoe Hershberger break; 8632057717SJoe Hershberger } 8732057717SJoe Hershberger 8832057717SJoe Hershberger return 0; 8932057717SJoe Hershberger case env_op_delete: 9032057717SJoe Hershberger printf("## Baudrate may not be deleted\n"); 9132057717SJoe Hershberger return 1; 9232057717SJoe Hershberger default: 9332057717SJoe Hershberger return 0; 9432057717SJoe Hershberger } 9532057717SJoe Hershberger } 9632057717SJoe Hershberger U_BOOT_ENV_CALLBACK(baudrate, on_baudrate); 9732057717SJoe Hershberger 9832057717SJoe Hershberger /** 999cd2b9e4SMarek Vasut * serial_initfunc() - Forward declare of driver registration routine 1009cd2b9e4SMarek Vasut * @name: Name of the real driver registration routine. 1019cd2b9e4SMarek Vasut * 1029cd2b9e4SMarek Vasut * This macro expands onto forward declaration of a driver registration 1039cd2b9e4SMarek Vasut * routine, which is then used below in serial_initialize() function. 1049cd2b9e4SMarek Vasut * The declaration is made weak and aliases to serial_null() so in case 1059cd2b9e4SMarek Vasut * the driver is not compiled in, the function is still declared and can 1069cd2b9e4SMarek Vasut * be used, but aliases to serial_null() and thus is optimized away. 1079cd2b9e4SMarek Vasut */ 1087742aa65SMarek Vasut #define serial_initfunc(name) \ 1097742aa65SMarek Vasut void name(void) \ 1107742aa65SMarek Vasut __attribute__((weak, alias("serial_null"))); 1117742aa65SMarek Vasut 1127742aa65SMarek Vasut serial_initfunc(mpc8xx_serial_initialize); 1137742aa65SMarek Vasut serial_initfunc(ns16550_serial_initialize); 1147742aa65SMarek Vasut serial_initfunc(pxa_serial_initialize); 1157742aa65SMarek Vasut serial_initfunc(s3c24xx_serial_initialize); 1167742aa65SMarek Vasut serial_initfunc(s5p_serial_initialize); 117870e0bdaSMichal Simek serial_initfunc(zynq_serial_initialize); 1187742aa65SMarek Vasut serial_initfunc(bfin_serial_initialize); 1197742aa65SMarek Vasut serial_initfunc(bfin_jtag_initialize); 1207742aa65SMarek Vasut serial_initfunc(mpc512x_serial_initialize); 1217742aa65SMarek Vasut serial_initfunc(uartlite_serial_initialize); 1227742aa65SMarek Vasut serial_initfunc(au1x00_serial_initialize); 1237742aa65SMarek Vasut serial_initfunc(asc_serial_initialize); 1247742aa65SMarek Vasut serial_initfunc(jz_serial_initialize); 1257742aa65SMarek Vasut serial_initfunc(mpc5xx_serial_initialize); 1267742aa65SMarek Vasut serial_initfunc(mpc8260_scc_serial_initialize); 1277742aa65SMarek Vasut serial_initfunc(mpc8260_smc_serial_initialize); 1287742aa65SMarek Vasut serial_initfunc(mpc85xx_serial_initialize); 1297742aa65SMarek Vasut serial_initfunc(iop480_serial_initialize); 1307742aa65SMarek Vasut serial_initfunc(leon2_serial_initialize); 1317742aa65SMarek Vasut serial_initfunc(leon3_serial_initialize); 1327742aa65SMarek Vasut serial_initfunc(marvell_serial_initialize); 1337742aa65SMarek Vasut serial_initfunc(amirix_serial_initialize); 1347742aa65SMarek Vasut serial_initfunc(bmw_serial_initialize); 1357742aa65SMarek Vasut serial_initfunc(cogent_serial_initialize); 1367742aa65SMarek Vasut serial_initfunc(cpci750_serial_initialize); 1377742aa65SMarek Vasut serial_initfunc(evb64260_serial_initialize); 1387742aa65SMarek Vasut serial_initfunc(ml2_serial_initialize); 1397742aa65SMarek Vasut serial_initfunc(sconsole_serial_initialize); 1407742aa65SMarek Vasut serial_initfunc(p3mx_serial_initialize); 1417742aa65SMarek Vasut serial_initfunc(altera_jtag_serial_initialize); 1427742aa65SMarek Vasut serial_initfunc(altera_serial_initialize); 1437742aa65SMarek Vasut serial_initfunc(atmel_serial_initialize); 1447742aa65SMarek Vasut serial_initfunc(lpc32xx_serial_initialize); 1457742aa65SMarek Vasut serial_initfunc(mcf_serial_initialize); 1467742aa65SMarek Vasut serial_initfunc(oc_serial_initialize); 1477742aa65SMarek Vasut serial_initfunc(sandbox_serial_initialize); 1487742aa65SMarek Vasut serial_initfunc(clps7111_serial_initialize); 1497742aa65SMarek Vasut serial_initfunc(imx_serial_initialize); 1507742aa65SMarek Vasut serial_initfunc(ks8695_serial_initialize); 1517742aa65SMarek Vasut serial_initfunc(lh7a40x_serial_initialize); 1527742aa65SMarek Vasut serial_initfunc(max3100_serial_initialize); 1537742aa65SMarek Vasut serial_initfunc(mxc_serial_initialize); 1547742aa65SMarek Vasut serial_initfunc(pl01x_serial_initialize); 1557742aa65SMarek Vasut serial_initfunc(sa1100_serial_initialize); 1567742aa65SMarek Vasut serial_initfunc(sh_serial_initialize); 157a168d3afSJagannadha Sutradharudu Teki serial_initfunc(arm_dcc_initialize); 158661edaafSAndreas Wass serial_initfunc(mxs_auart_initialize); 15922a240c3SAlexey Brodkin serial_initfunc(arc_serial_initialize); 1607742aa65SMarek Vasut 1619cd2b9e4SMarek Vasut /** 1629cd2b9e4SMarek Vasut * serial_register() - Register serial driver with serial driver core 1639cd2b9e4SMarek Vasut * @dev: Pointer to the serial driver structure 1649cd2b9e4SMarek Vasut * 1659cd2b9e4SMarek Vasut * This function registers the serial driver supplied via @dev with 1669cd2b9e4SMarek Vasut * serial driver core, thus making U-Boot aware of it and making it 1679cd2b9e4SMarek Vasut * available for U-Boot to use. On platforms that still require manual 1689cd2b9e4SMarek Vasut * relocation of constant variables, relocation of the supplied structure 1699cd2b9e4SMarek Vasut * is performed. 1709cd2b9e4SMarek Vasut */ 1717742aa65SMarek Vasut void serial_register(struct serial_device *dev) 1727742aa65SMarek Vasut { 1737742aa65SMarek Vasut #ifdef CONFIG_NEEDS_MANUAL_RELOC 174f2760c4aSMarek Vasut if (dev->start) 1757742aa65SMarek Vasut dev->start += gd->reloc_off; 176f2760c4aSMarek Vasut if (dev->stop) 177f2760c4aSMarek Vasut dev->stop += gd->reloc_off; 178f2760c4aSMarek Vasut if (dev->setbrg) 1797742aa65SMarek Vasut dev->setbrg += gd->reloc_off; 180f2760c4aSMarek Vasut if (dev->getc) 1817742aa65SMarek Vasut dev->getc += gd->reloc_off; 182f2760c4aSMarek Vasut if (dev->tstc) 1837742aa65SMarek Vasut dev->tstc += gd->reloc_off; 184f2760c4aSMarek Vasut if (dev->putc) 1857742aa65SMarek Vasut dev->putc += gd->reloc_off; 186f2760c4aSMarek Vasut if (dev->puts) 1877742aa65SMarek Vasut dev->puts += gd->reloc_off; 1887742aa65SMarek Vasut #endif 1897742aa65SMarek Vasut 1907742aa65SMarek Vasut dev->next = serial_devices; 1917742aa65SMarek Vasut serial_devices = dev; 1927742aa65SMarek Vasut } 1937742aa65SMarek Vasut 1949cd2b9e4SMarek Vasut /** 1959cd2b9e4SMarek Vasut * serial_initialize() - Register all compiled-in serial port drivers 1969cd2b9e4SMarek Vasut * 1979cd2b9e4SMarek Vasut * This function registers all serial port drivers that are compiled 1989cd2b9e4SMarek Vasut * into the U-Boot binary with the serial core, thus making them 1999cd2b9e4SMarek Vasut * available to U-Boot to use. Lastly, this function assigns a default 2009cd2b9e4SMarek Vasut * serial port to the serial core. That serial port is then used as a 2019cd2b9e4SMarek Vasut * default output. 2029cd2b9e4SMarek Vasut */ 2037742aa65SMarek Vasut void serial_initialize(void) 2047742aa65SMarek Vasut { 2057742aa65SMarek Vasut mpc8xx_serial_initialize(); 2067742aa65SMarek Vasut ns16550_serial_initialize(); 2077742aa65SMarek Vasut pxa_serial_initialize(); 2087742aa65SMarek Vasut s3c24xx_serial_initialize(); 2097742aa65SMarek Vasut s5p_serial_initialize(); 2107742aa65SMarek Vasut mpc512x_serial_initialize(); 2117742aa65SMarek Vasut bfin_serial_initialize(); 2127742aa65SMarek Vasut bfin_jtag_initialize(); 2137742aa65SMarek Vasut uartlite_serial_initialize(); 214870e0bdaSMichal Simek zynq_serial_initialize(); 2157742aa65SMarek Vasut au1x00_serial_initialize(); 2167742aa65SMarek Vasut asc_serial_initialize(); 2177742aa65SMarek Vasut jz_serial_initialize(); 2187742aa65SMarek Vasut mpc5xx_serial_initialize(); 2197742aa65SMarek Vasut mpc8260_scc_serial_initialize(); 2207742aa65SMarek Vasut mpc8260_smc_serial_initialize(); 2217742aa65SMarek Vasut mpc85xx_serial_initialize(); 2227742aa65SMarek Vasut iop480_serial_initialize(); 2237742aa65SMarek Vasut leon2_serial_initialize(); 2247742aa65SMarek Vasut leon3_serial_initialize(); 2257742aa65SMarek Vasut marvell_serial_initialize(); 2267742aa65SMarek Vasut amirix_serial_initialize(); 2277742aa65SMarek Vasut bmw_serial_initialize(); 2287742aa65SMarek Vasut cogent_serial_initialize(); 2297742aa65SMarek Vasut cpci750_serial_initialize(); 2307742aa65SMarek Vasut evb64260_serial_initialize(); 2317742aa65SMarek Vasut ml2_serial_initialize(); 2327742aa65SMarek Vasut sconsole_serial_initialize(); 2337742aa65SMarek Vasut p3mx_serial_initialize(); 2347742aa65SMarek Vasut altera_jtag_serial_initialize(); 2357742aa65SMarek Vasut altera_serial_initialize(); 2367742aa65SMarek Vasut atmel_serial_initialize(); 2377742aa65SMarek Vasut lpc32xx_serial_initialize(); 2387742aa65SMarek Vasut mcf_serial_initialize(); 2397742aa65SMarek Vasut oc_serial_initialize(); 2407742aa65SMarek Vasut sandbox_serial_initialize(); 2417742aa65SMarek Vasut clps7111_serial_initialize(); 2427742aa65SMarek Vasut imx_serial_initialize(); 2437742aa65SMarek Vasut ks8695_serial_initialize(); 2447742aa65SMarek Vasut lh7a40x_serial_initialize(); 2457742aa65SMarek Vasut max3100_serial_initialize(); 2467742aa65SMarek Vasut mxc_serial_initialize(); 2477742aa65SMarek Vasut pl01x_serial_initialize(); 2487742aa65SMarek Vasut sa1100_serial_initialize(); 2497742aa65SMarek Vasut sh_serial_initialize(); 250a168d3afSJagannadha Sutradharudu Teki arm_dcc_initialize(); 251661edaafSAndreas Wass mxs_auart_initialize(); 25222a240c3SAlexey Brodkin arc_serial_initialize(); 2537742aa65SMarek Vasut 2547742aa65SMarek Vasut serial_assign(default_serial_console()->name); 2557742aa65SMarek Vasut } 2567742aa65SMarek Vasut 2579cd2b9e4SMarek Vasut /** 2589cd2b9e4SMarek Vasut * serial_stdio_init() - Register serial ports with STDIO core 2599cd2b9e4SMarek Vasut * 2609cd2b9e4SMarek Vasut * This function generates a proxy driver for each serial port driver. 2619cd2b9e4SMarek Vasut * These proxy drivers then register with the STDIO core, making the 2629cd2b9e4SMarek Vasut * serial drivers available as STDIO devices. 2639cd2b9e4SMarek Vasut */ 2647742aa65SMarek Vasut void serial_stdio_init(void) 2657742aa65SMarek Vasut { 2667742aa65SMarek Vasut struct stdio_dev dev; 2677742aa65SMarek Vasut struct serial_device *s = serial_devices; 2687742aa65SMarek Vasut 2697742aa65SMarek Vasut while (s) { 2707742aa65SMarek Vasut memset(&dev, 0, sizeof(dev)); 2717742aa65SMarek Vasut 2727742aa65SMarek Vasut strcpy(dev.name, s->name); 2737742aa65SMarek Vasut dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; 2747742aa65SMarek Vasut 2757742aa65SMarek Vasut dev.start = s->start; 2767742aa65SMarek Vasut dev.stop = s->stop; 2777742aa65SMarek Vasut dev.putc = s->putc; 2787742aa65SMarek Vasut dev.puts = s->puts; 2797742aa65SMarek Vasut dev.getc = s->getc; 2807742aa65SMarek Vasut dev.tstc = s->tstc; 2817742aa65SMarek Vasut 2827742aa65SMarek Vasut stdio_register(&dev); 2837742aa65SMarek Vasut 2847742aa65SMarek Vasut s = s->next; 2857742aa65SMarek Vasut } 2867742aa65SMarek Vasut } 2877742aa65SMarek Vasut 2889cd2b9e4SMarek Vasut /** 2899cd2b9e4SMarek Vasut * serial_assign() - Select the serial output device by name 2909cd2b9e4SMarek Vasut * @name: Name of the serial driver to be used as default output 2919cd2b9e4SMarek Vasut * 2929cd2b9e4SMarek Vasut * This function configures the serial output multiplexing by 2939cd2b9e4SMarek Vasut * selecting which serial device will be used as default. In case 2949cd2b9e4SMarek Vasut * the STDIO "serial" device is selected as stdin/stdout/stderr, 2959cd2b9e4SMarek Vasut * the serial device previously configured by this function will be 2969cd2b9e4SMarek Vasut * used for the particular operation. 2979cd2b9e4SMarek Vasut * 2989cd2b9e4SMarek Vasut * Returns 0 on success, negative on error. 2999cd2b9e4SMarek Vasut */ 3007742aa65SMarek Vasut int serial_assign(const char *name) 3017742aa65SMarek Vasut { 3027742aa65SMarek Vasut struct serial_device *s; 3037742aa65SMarek Vasut 3047742aa65SMarek Vasut for (s = serial_devices; s; s = s->next) { 3056d93e258SMarek Vasut if (strcmp(s->name, name)) 3066d93e258SMarek Vasut continue; 3077742aa65SMarek Vasut serial_current = s; 3087742aa65SMarek Vasut return 0; 3097742aa65SMarek Vasut } 3107742aa65SMarek Vasut 3116d93e258SMarek Vasut return -EINVAL; 3127742aa65SMarek Vasut } 3137742aa65SMarek Vasut 3149cd2b9e4SMarek Vasut /** 3159cd2b9e4SMarek Vasut * serial_reinit_all() - Reinitialize all compiled-in serial ports 3169cd2b9e4SMarek Vasut * 3179cd2b9e4SMarek Vasut * This function reinitializes all serial ports that are compiled 3189cd2b9e4SMarek Vasut * into U-Boot by calling their serial_start() functions. 3199cd2b9e4SMarek Vasut */ 3207742aa65SMarek Vasut void serial_reinit_all(void) 3217742aa65SMarek Vasut { 3227742aa65SMarek Vasut struct serial_device *s; 3237742aa65SMarek Vasut 3247742aa65SMarek Vasut for (s = serial_devices; s; s = s->next) 3257742aa65SMarek Vasut s->start(); 3267742aa65SMarek Vasut } 3277742aa65SMarek Vasut 3289cd2b9e4SMarek Vasut /** 3299cd2b9e4SMarek Vasut * get_current() - Return pointer to currently selected serial port 3309cd2b9e4SMarek Vasut * 3319cd2b9e4SMarek Vasut * This function returns a pointer to currently selected serial port. 3329cd2b9e4SMarek Vasut * The currently selected serial port is altered by serial_assign() 3339cd2b9e4SMarek Vasut * function. 3349cd2b9e4SMarek Vasut * 3359cd2b9e4SMarek Vasut * In case this function is called before relocation or before any serial 3369cd2b9e4SMarek Vasut * port is configured, this function calls default_serial_console() to 3379cd2b9e4SMarek Vasut * determine the serial port. Otherwise, the configured serial port is 3389cd2b9e4SMarek Vasut * returned. 3399cd2b9e4SMarek Vasut * 3409cd2b9e4SMarek Vasut * Returns pointer to the currently selected serial port on success, 3419cd2b9e4SMarek Vasut * NULL on error. 3429cd2b9e4SMarek Vasut */ 3437742aa65SMarek Vasut static struct serial_device *get_current(void) 3447742aa65SMarek Vasut { 3457742aa65SMarek Vasut struct serial_device *dev; 3467742aa65SMarek Vasut 347dee19416SMarek Vasut if (!(gd->flags & GD_FLG_RELOC)) 3487742aa65SMarek Vasut dev = default_serial_console(); 349dee19416SMarek Vasut else if (!serial_current) 350dee19416SMarek Vasut dev = default_serial_console(); 351dee19416SMarek Vasut else 352dee19416SMarek Vasut dev = serial_current; 3537742aa65SMarek Vasut 3547742aa65SMarek Vasut /* We must have a console device */ 3557742aa65SMarek Vasut if (!dev) { 3567742aa65SMarek Vasut #ifdef CONFIG_SPL_BUILD 3577742aa65SMarek Vasut puts("Cannot find console\n"); 3587742aa65SMarek Vasut hang(); 3597742aa65SMarek Vasut #else 3607742aa65SMarek Vasut panic("Cannot find console\n"); 3617742aa65SMarek Vasut #endif 3627742aa65SMarek Vasut } 363dee19416SMarek Vasut 3647742aa65SMarek Vasut return dev; 3657742aa65SMarek Vasut } 3667742aa65SMarek Vasut 3679cd2b9e4SMarek Vasut /** 3689cd2b9e4SMarek Vasut * serial_init() - Initialize currently selected serial port 3699cd2b9e4SMarek Vasut * 3709cd2b9e4SMarek Vasut * This function initializes the currently selected serial port. This 3719cd2b9e4SMarek Vasut * usually involves setting up the registers of that particular port, 3729cd2b9e4SMarek Vasut * enabling clock and such. This function uses the get_current() call 3739cd2b9e4SMarek Vasut * to determine which port is selected. 3749cd2b9e4SMarek Vasut * 3759cd2b9e4SMarek Vasut * Returns 0 on success, negative on error. 3769cd2b9e4SMarek Vasut */ 3777742aa65SMarek Vasut int serial_init(void) 3787742aa65SMarek Vasut { 3797742aa65SMarek Vasut return get_current()->start(); 3807742aa65SMarek Vasut } 3817742aa65SMarek Vasut 3829cd2b9e4SMarek Vasut /** 3839cd2b9e4SMarek Vasut * serial_setbrg() - Configure baud-rate of currently selected serial port 3849cd2b9e4SMarek Vasut * 3859cd2b9e4SMarek Vasut * This function configures the baud-rate of the currently selected 3869cd2b9e4SMarek Vasut * serial port. The baud-rate is retrieved from global data within 3879cd2b9e4SMarek Vasut * the serial port driver. This function uses the get_current() call 3889cd2b9e4SMarek Vasut * to determine which port is selected. 3899cd2b9e4SMarek Vasut * 3909cd2b9e4SMarek Vasut * Returns 0 on success, negative on error. 3919cd2b9e4SMarek Vasut */ 3927742aa65SMarek Vasut void serial_setbrg(void) 3937742aa65SMarek Vasut { 3947742aa65SMarek Vasut get_current()->setbrg(); 3957742aa65SMarek Vasut } 3967742aa65SMarek Vasut 3979cd2b9e4SMarek Vasut /** 3989cd2b9e4SMarek Vasut * serial_getc() - Read character from currently selected serial port 3999cd2b9e4SMarek Vasut * 4009cd2b9e4SMarek Vasut * This function retrieves a character from currently selected serial 4019cd2b9e4SMarek Vasut * port. In case there is no character waiting on the serial port, 4029cd2b9e4SMarek Vasut * this function will block and wait for the character to appear. This 4039cd2b9e4SMarek Vasut * function uses the get_current() call to determine which port is 4049cd2b9e4SMarek Vasut * selected. 4059cd2b9e4SMarek Vasut * 4069cd2b9e4SMarek Vasut * Returns the character on success, negative on error. 4079cd2b9e4SMarek Vasut */ 4087742aa65SMarek Vasut int serial_getc(void) 4097742aa65SMarek Vasut { 4107742aa65SMarek Vasut return get_current()->getc(); 4117742aa65SMarek Vasut } 4127742aa65SMarek Vasut 4139cd2b9e4SMarek Vasut /** 4149cd2b9e4SMarek Vasut * serial_tstc() - Test if data is available on currently selected serial port 4159cd2b9e4SMarek Vasut * 4169cd2b9e4SMarek Vasut * This function tests if one or more characters are available on 4179cd2b9e4SMarek Vasut * currently selected serial port. This function never blocks. This 4189cd2b9e4SMarek Vasut * function uses the get_current() call to determine which port is 4199cd2b9e4SMarek Vasut * selected. 4209cd2b9e4SMarek Vasut * 4219cd2b9e4SMarek Vasut * Returns positive if character is available, zero otherwise. 4229cd2b9e4SMarek Vasut */ 4237742aa65SMarek Vasut int serial_tstc(void) 4247742aa65SMarek Vasut { 4257742aa65SMarek Vasut return get_current()->tstc(); 4267742aa65SMarek Vasut } 4277742aa65SMarek Vasut 4289cd2b9e4SMarek Vasut /** 4299cd2b9e4SMarek Vasut * serial_putc() - Output character via currently selected serial port 4309cd2b9e4SMarek Vasut * @c: Single character to be output from the serial port. 4319cd2b9e4SMarek Vasut * 4329cd2b9e4SMarek Vasut * This function outputs a character via currently selected serial 4339cd2b9e4SMarek Vasut * port. This character is passed to the serial port driver responsible 4349cd2b9e4SMarek Vasut * for controlling the hardware. The hardware may still be in process 4359cd2b9e4SMarek Vasut * of transmitting another character, therefore this function may block 4369cd2b9e4SMarek Vasut * for a short amount of time. This function uses the get_current() 4379cd2b9e4SMarek Vasut * call to determine which port is selected. 4389cd2b9e4SMarek Vasut */ 4397742aa65SMarek Vasut void serial_putc(const char c) 4407742aa65SMarek Vasut { 4417742aa65SMarek Vasut get_current()->putc(c); 4427742aa65SMarek Vasut } 4437742aa65SMarek Vasut 4449cd2b9e4SMarek Vasut /** 4459cd2b9e4SMarek Vasut * serial_puts() - Output string via currently selected serial port 4469cd2b9e4SMarek Vasut * @s: Zero-terminated string to be output from the serial port. 4479cd2b9e4SMarek Vasut * 4489cd2b9e4SMarek Vasut * This function outputs a zero-terminated string via currently 4499cd2b9e4SMarek Vasut * selected serial port. This function behaves as an accelerator 4509cd2b9e4SMarek Vasut * in case the hardware can queue multiple characters for transfer. 4519cd2b9e4SMarek Vasut * The whole string that is to be output is available to the function 4529cd2b9e4SMarek Vasut * implementing the hardware manipulation. Transmitting the whole 4539cd2b9e4SMarek Vasut * string may take some time, thus this function may block for some 4549cd2b9e4SMarek Vasut * amount of time. This function uses the get_current() call to 4559cd2b9e4SMarek Vasut * determine which port is selected. 4569cd2b9e4SMarek Vasut */ 4577742aa65SMarek Vasut void serial_puts(const char *s) 4587742aa65SMarek Vasut { 4597742aa65SMarek Vasut get_current()->puts(s); 4607742aa65SMarek Vasut } 4617742aa65SMarek Vasut 4629cd2b9e4SMarek Vasut /** 4639cd2b9e4SMarek Vasut * default_serial_puts() - Output string by calling serial_putc() in loop 4649cd2b9e4SMarek Vasut * @s: Zero-terminated string to be output from the serial port. 4659cd2b9e4SMarek Vasut * 4669cd2b9e4SMarek Vasut * This function outputs a zero-terminated string by calling serial_putc() 4679cd2b9e4SMarek Vasut * in a loop. Most drivers do not support queueing more than one byte for 4689cd2b9e4SMarek Vasut * transfer, thus this function precisely implements their serial_puts(). 4699cd2b9e4SMarek Vasut * 4709cd2b9e4SMarek Vasut * To optimize the number of get_current() calls, this function only 4719cd2b9e4SMarek Vasut * calls get_current() once and then directly accesses the putc() call 4729cd2b9e4SMarek Vasut * of the &struct serial_device . 4739cd2b9e4SMarek Vasut */ 474bfb7d7a3SMarek Vasut void default_serial_puts(const char *s) 475bfb7d7a3SMarek Vasut { 476bfb7d7a3SMarek Vasut struct serial_device *dev = get_current(); 477bfb7d7a3SMarek Vasut while (*s) 478bfb7d7a3SMarek Vasut dev->putc(*s++); 479bfb7d7a3SMarek Vasut } 480bfb7d7a3SMarek Vasut 4817742aa65SMarek Vasut #if CONFIG_POST & CONFIG_SYS_POST_UART 4827742aa65SMarek Vasut static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE; 4837742aa65SMarek Vasut 4849cd2b9e4SMarek Vasut /** 4859cd2b9e4SMarek Vasut * uart_post_test() - Test the currently selected serial port using POST 4869cd2b9e4SMarek Vasut * @flags: POST framework flags 4879cd2b9e4SMarek Vasut * 4889cd2b9e4SMarek Vasut * Do a loopback test of the currently selected serial port. This 4899cd2b9e4SMarek Vasut * function is only useful in the context of the POST testing framwork. 4909cd2b9e4SMarek Vasut * The serial port is firstly configured into loopback mode and then 4919cd2b9e4SMarek Vasut * characters are sent through it. 4929cd2b9e4SMarek Vasut * 4939cd2b9e4SMarek Vasut * Returns 0 on success, value otherwise. 4949cd2b9e4SMarek Vasut */ 4957742aa65SMarek Vasut /* Mark weak until post/cpu/.../uart.c migrate over */ 4967742aa65SMarek Vasut __weak 4977742aa65SMarek Vasut int uart_post_test(int flags) 4987742aa65SMarek Vasut { 4997742aa65SMarek Vasut unsigned char c; 5007742aa65SMarek Vasut int ret, saved_baud, b; 5017742aa65SMarek Vasut struct serial_device *saved_dev, *s; 5027742aa65SMarek Vasut 5037742aa65SMarek Vasut /* Save current serial state */ 5047742aa65SMarek Vasut ret = 0; 5057742aa65SMarek Vasut saved_dev = serial_current; 506*8e261575SMasahiro Yamada saved_baud = gd->baudrate; 5077742aa65SMarek Vasut 5087742aa65SMarek Vasut for (s = serial_devices; s; s = s->next) { 5097742aa65SMarek Vasut /* If this driver doesn't support loop back, skip it */ 5107742aa65SMarek Vasut if (!s->loop) 5117742aa65SMarek Vasut continue; 5127742aa65SMarek Vasut 5137742aa65SMarek Vasut /* Test the next device */ 5147742aa65SMarek Vasut serial_current = s; 5157742aa65SMarek Vasut 5167742aa65SMarek Vasut ret = serial_init(); 5177742aa65SMarek Vasut if (ret) 5187742aa65SMarek Vasut goto done; 5197742aa65SMarek Vasut 5207742aa65SMarek Vasut /* Consume anything that happens to be queued */ 5217742aa65SMarek Vasut while (serial_tstc()) 5227742aa65SMarek Vasut serial_getc(); 5237742aa65SMarek Vasut 5247742aa65SMarek Vasut /* Enable loop back */ 5257742aa65SMarek Vasut s->loop(1); 5267742aa65SMarek Vasut 5277742aa65SMarek Vasut /* Test every available baud rate */ 5287742aa65SMarek Vasut for (b = 0; b < ARRAY_SIZE(bauds); ++b) { 529*8e261575SMasahiro Yamada gd->baudrate = bauds[b]; 5307742aa65SMarek Vasut serial_setbrg(); 5317742aa65SMarek Vasut 5327742aa65SMarek Vasut /* 5337742aa65SMarek Vasut * Stick to printable chars to avoid issues: 5347742aa65SMarek Vasut * - terminal corruption 5357742aa65SMarek Vasut * - serial program reacting to sequences and sending 5367742aa65SMarek Vasut * back random extra data 5377742aa65SMarek Vasut * - most serial drivers add in extra chars (like \r\n) 5387742aa65SMarek Vasut */ 5397742aa65SMarek Vasut for (c = 0x20; c < 0x7f; ++c) { 5407742aa65SMarek Vasut /* Send it out */ 5417742aa65SMarek Vasut serial_putc(c); 5427742aa65SMarek Vasut 5437742aa65SMarek Vasut /* Make sure it's the same one */ 5447742aa65SMarek Vasut ret = (c != serial_getc()); 5457742aa65SMarek Vasut if (ret) { 5467742aa65SMarek Vasut s->loop(0); 5477742aa65SMarek Vasut goto done; 5487742aa65SMarek Vasut } 5497742aa65SMarek Vasut 5507742aa65SMarek Vasut /* Clean up the output in case it was sent */ 5517742aa65SMarek Vasut serial_putc('\b'); 5527742aa65SMarek Vasut ret = ('\b' != serial_getc()); 5537742aa65SMarek Vasut if (ret) { 5547742aa65SMarek Vasut s->loop(0); 5557742aa65SMarek Vasut goto done; 5567742aa65SMarek Vasut } 5577742aa65SMarek Vasut } 5587742aa65SMarek Vasut } 5597742aa65SMarek Vasut 5607742aa65SMarek Vasut /* Disable loop back */ 5617742aa65SMarek Vasut s->loop(0); 5627742aa65SMarek Vasut 5637742aa65SMarek Vasut /* XXX: There is no serial_stop() !? */ 5647742aa65SMarek Vasut if (s->stop) 5657742aa65SMarek Vasut s->stop(); 5667742aa65SMarek Vasut } 5677742aa65SMarek Vasut 5687742aa65SMarek Vasut done: 5697742aa65SMarek Vasut /* Restore previous serial state */ 5707742aa65SMarek Vasut serial_current = saved_dev; 571*8e261575SMasahiro Yamada gd->baudrate = saved_baud; 5727742aa65SMarek Vasut serial_reinit_all(); 5737742aa65SMarek Vasut serial_setbrg(); 5747742aa65SMarek Vasut 5757742aa65SMarek Vasut return ret; 5767742aa65SMarek Vasut } 5777742aa65SMarek Vasut #endif 578