diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/serial/serial.c')
| -rw-r--r-- | qemu/roms/u-boot/drivers/serial/serial.c | 577 |
1 files changed, 577 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/serial/serial.c b/qemu/roms/u-boot/drivers/serial/serial.c new file mode 100644 index 000000000..fd61a5e54 --- /dev/null +++ b/qemu/roms/u-boot/drivers/serial/serial.c @@ -0,0 +1,577 @@ +/* + * (C) Copyright 2004 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <environment.h> +#include <serial.h> +#include <stdio_dev.h> +#include <post.h> +#include <linux/compiler.h> +#include <errno.h> + +DECLARE_GLOBAL_DATA_PTR; + +static struct serial_device *serial_devices; +static struct serial_device *serial_current; +/* + * Table with supported baudrates (defined in config_xyz.h) + */ +static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE; + +/** + * serial_null() - Void registration routine of a serial driver + * + * This routine implements a void registration routine of a serial + * driver. The registration routine of a particular driver is aliased + * to this empty function in case the driver is not compiled into + * U-Boot. + */ +static void serial_null(void) +{ +} + +/** + * on_baudrate() - Update the actual baudrate when the env var changes + * + * This will check for a valid baudrate and only apply it if valid. + */ +static int on_baudrate(const char *name, const char *value, enum env_op op, + int flags) +{ + int i; + int baudrate; + + switch (op) { + case env_op_create: + case env_op_overwrite: + /* + * Switch to new baudrate if new baudrate is supported + */ + baudrate = simple_strtoul(value, NULL, 10); + + /* Not actually changing */ + if (gd->baudrate == baudrate) + return 0; + + for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) { + if (baudrate == baudrate_table[i]) + break; + } + if (i == ARRAY_SIZE(baudrate_table)) { + if ((flags & H_FORCE) == 0) + printf("## Baudrate %d bps not supported\n", + baudrate); + return 1; + } + if ((flags & H_INTERACTIVE) != 0) { + printf("## Switch baudrate to %d" + " bps and press ENTER ...\n", baudrate); + udelay(50000); + } + + gd->baudrate = baudrate; + + serial_setbrg(); + + udelay(50000); + + if ((flags & H_INTERACTIVE) != 0) + while (1) { + if (getc() == '\r') + break; + } + + return 0; + case env_op_delete: + printf("## Baudrate may not be deleted\n"); + return 1; + default: + return 0; + } +} +U_BOOT_ENV_CALLBACK(baudrate, on_baudrate); + +/** + * serial_initfunc() - Forward declare of driver registration routine + * @name: Name of the real driver registration routine. + * + * This macro expands onto forward declaration of a driver registration + * routine, which is then used below in serial_initialize() function. + * The declaration is made weak and aliases to serial_null() so in case + * the driver is not compiled in, the function is still declared and can + * be used, but aliases to serial_null() and thus is optimized away. + */ +#define serial_initfunc(name) \ + void name(void) \ + __attribute__((weak, alias("serial_null"))); + +serial_initfunc(mpc8xx_serial_initialize); +serial_initfunc(ns16550_serial_initialize); +serial_initfunc(pxa_serial_initialize); +serial_initfunc(s3c24xx_serial_initialize); +serial_initfunc(s5p_serial_initialize); +serial_initfunc(zynq_serial_initialize); +serial_initfunc(bfin_serial_initialize); +serial_initfunc(bfin_jtag_initialize); +serial_initfunc(mpc512x_serial_initialize); +serial_initfunc(uartlite_serial_initialize); +serial_initfunc(au1x00_serial_initialize); +serial_initfunc(asc_serial_initialize); +serial_initfunc(jz_serial_initialize); +serial_initfunc(mpc5xx_serial_initialize); +serial_initfunc(mpc8260_scc_serial_initialize); +serial_initfunc(mpc8260_smc_serial_initialize); +serial_initfunc(mpc85xx_serial_initialize); +serial_initfunc(iop480_serial_initialize); +serial_initfunc(leon2_serial_initialize); +serial_initfunc(leon3_serial_initialize); +serial_initfunc(marvell_serial_initialize); +serial_initfunc(amirix_serial_initialize); +serial_initfunc(bmw_serial_initialize); +serial_initfunc(cogent_serial_initialize); +serial_initfunc(cpci750_serial_initialize); +serial_initfunc(evb64260_serial_initialize); +serial_initfunc(ml2_serial_initialize); +serial_initfunc(sconsole_serial_initialize); +serial_initfunc(p3mx_serial_initialize); +serial_initfunc(altera_jtag_serial_initialize); +serial_initfunc(altera_serial_initialize); +serial_initfunc(atmel_serial_initialize); +serial_initfunc(lpc32xx_serial_initialize); +serial_initfunc(mcf_serial_initialize); +serial_initfunc(oc_serial_initialize); +serial_initfunc(sandbox_serial_initialize); +serial_initfunc(clps7111_serial_initialize); +serial_initfunc(imx_serial_initialize); +serial_initfunc(ks8695_serial_initialize); +serial_initfunc(lh7a40x_serial_initialize); +serial_initfunc(max3100_serial_initialize); +serial_initfunc(mxc_serial_initialize); +serial_initfunc(pl01x_serial_initialize); +serial_initfunc(sa1100_serial_initialize); +serial_initfunc(sh_serial_initialize); +serial_initfunc(arm_dcc_initialize); +serial_initfunc(mxs_auart_initialize); +serial_initfunc(arc_serial_initialize); + +/** + * serial_register() - Register serial driver with serial driver core + * @dev: Pointer to the serial driver structure + * + * This function registers the serial driver supplied via @dev with + * serial driver core, thus making U-Boot aware of it and making it + * available for U-Boot to use. On platforms that still require manual + * relocation of constant variables, relocation of the supplied structure + * is performed. + */ +void serial_register(struct serial_device *dev) +{ +#ifdef CONFIG_NEEDS_MANUAL_RELOC + if (dev->start) + dev->start += gd->reloc_off; + if (dev->stop) + dev->stop += gd->reloc_off; + if (dev->setbrg) + dev->setbrg += gd->reloc_off; + if (dev->getc) + dev->getc += gd->reloc_off; + if (dev->tstc) + dev->tstc += gd->reloc_off; + if (dev->putc) + dev->putc += gd->reloc_off; + if (dev->puts) + dev->puts += gd->reloc_off; +#endif + + dev->next = serial_devices; + serial_devices = dev; +} + +/** + * serial_initialize() - Register all compiled-in serial port drivers + * + * This function registers all serial port drivers that are compiled + * into the U-Boot binary with the serial core, thus making them + * available to U-Boot to use. Lastly, this function assigns a default + * serial port to the serial core. That serial port is then used as a + * default output. + */ +void serial_initialize(void) +{ + mpc8xx_serial_initialize(); + ns16550_serial_initialize(); + pxa_serial_initialize(); + s3c24xx_serial_initialize(); + s5p_serial_initialize(); + mpc512x_serial_initialize(); + bfin_serial_initialize(); + bfin_jtag_initialize(); + uartlite_serial_initialize(); + zynq_serial_initialize(); + au1x00_serial_initialize(); + asc_serial_initialize(); + jz_serial_initialize(); + mpc5xx_serial_initialize(); + mpc8260_scc_serial_initialize(); + mpc8260_smc_serial_initialize(); + mpc85xx_serial_initialize(); + iop480_serial_initialize(); + leon2_serial_initialize(); + leon3_serial_initialize(); + marvell_serial_initialize(); + amirix_serial_initialize(); + bmw_serial_initialize(); + cogent_serial_initialize(); + cpci750_serial_initialize(); + evb64260_serial_initialize(); + ml2_serial_initialize(); + sconsole_serial_initialize(); + p3mx_serial_initialize(); + altera_jtag_serial_initialize(); + altera_serial_initialize(); + atmel_serial_initialize(); + lpc32xx_serial_initialize(); + mcf_serial_initialize(); + oc_serial_initialize(); + sandbox_serial_initialize(); + clps7111_serial_initialize(); + imx_serial_initialize(); + ks8695_serial_initialize(); + lh7a40x_serial_initialize(); + max3100_serial_initialize(); + mxc_serial_initialize(); + pl01x_serial_initialize(); + sa1100_serial_initialize(); + sh_serial_initialize(); + arm_dcc_initialize(); + mxs_auart_initialize(); + arc_serial_initialize(); + + serial_assign(default_serial_console()->name); +} + +/** + * serial_stdio_init() - Register serial ports with STDIO core + * + * This function generates a proxy driver for each serial port driver. + * These proxy drivers then register with the STDIO core, making the + * serial drivers available as STDIO devices. + */ +void serial_stdio_init(void) +{ + struct stdio_dev dev; + struct serial_device *s = serial_devices; + + while (s) { + memset(&dev, 0, sizeof(dev)); + + strcpy(dev.name, s->name); + dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; + + dev.start = s->start; + dev.stop = s->stop; + dev.putc = s->putc; + dev.puts = s->puts; + dev.getc = s->getc; + dev.tstc = s->tstc; + + stdio_register(&dev); + + s = s->next; + } +} + +/** + * serial_assign() - Select the serial output device by name + * @name: Name of the serial driver to be used as default output + * + * This function configures the serial output multiplexing by + * selecting which serial device will be used as default. In case + * the STDIO "serial" device is selected as stdin/stdout/stderr, + * the serial device previously configured by this function will be + * used for the particular operation. + * + * Returns 0 on success, negative on error. + */ +int serial_assign(const char *name) +{ + struct serial_device *s; + + for (s = serial_devices; s; s = s->next) { + if (strcmp(s->name, name)) + continue; + serial_current = s; + return 0; + } + + return -EINVAL; +} + +/** + * serial_reinit_all() - Reinitialize all compiled-in serial ports + * + * This function reinitializes all serial ports that are compiled + * into U-Boot by calling their serial_start() functions. + */ +void serial_reinit_all(void) +{ + struct serial_device *s; + + for (s = serial_devices; s; s = s->next) + s->start(); +} + +/** + * get_current() - Return pointer to currently selected serial port + * + * This function returns a pointer to currently selected serial port. + * The currently selected serial port is altered by serial_assign() + * function. + * + * In case this function is called before relocation or before any serial + * port is configured, this function calls default_serial_console() to + * determine the serial port. Otherwise, the configured serial port is + * returned. + * + * Returns pointer to the currently selected serial port on success, + * NULL on error. + */ +static struct serial_device *get_current(void) +{ + struct serial_device *dev; + + if (!(gd->flags & GD_FLG_RELOC)) + dev = default_serial_console(); + else if (!serial_current) + dev = default_serial_console(); + else + dev = serial_current; + + /* We must have a console device */ + if (!dev) { +#ifdef CONFIG_SPL_BUILD + puts("Cannot find console\n"); + hang(); +#else + panic("Cannot find console\n"); +#endif + } + + return dev; +} + +/** + * serial_init() - Initialize currently selected serial port + * + * This function initializes the currently selected serial port. This + * usually involves setting up the registers of that particular port, + * enabling clock and such. This function uses the get_current() call + * to determine which port is selected. + * + * Returns 0 on success, negative on error. + */ +int serial_init(void) +{ + return get_current()->start(); +} + +/** + * serial_setbrg() - Configure baud-rate of currently selected serial port + * + * This function configures the baud-rate of the currently selected + * serial port. The baud-rate is retrieved from global data within + * the serial port driver. This function uses the get_current() call + * to determine which port is selected. + * + * Returns 0 on success, negative on error. + */ +void serial_setbrg(void) +{ + get_current()->setbrg(); +} + +/** + * serial_getc() - Read character from currently selected serial port + * + * This function retrieves a character from currently selected serial + * port. In case there is no character waiting on the serial port, + * this function will block and wait for the character to appear. This + * function uses the get_current() call to determine which port is + * selected. + * + * Returns the character on success, negative on error. + */ +int serial_getc(void) +{ + return get_current()->getc(); +} + +/** + * serial_tstc() - Test if data is available on currently selected serial port + * + * This function tests if one or more characters are available on + * currently selected serial port. This function never blocks. This + * function uses the get_current() call to determine which port is + * selected. + * + * Returns positive if character is available, zero otherwise. + */ +int serial_tstc(void) +{ + return get_current()->tstc(); +} + +/** + * serial_putc() - Output character via currently selected serial port + * @c: Single character to be output from the serial port. + * + * This function outputs a character via currently selected serial + * port. This character is passed to the serial port driver responsible + * for controlling the hardware. The hardware may still be in process + * of transmitting another character, therefore this function may block + * for a short amount of time. This function uses the get_current() + * call to determine which port is selected. + */ +void serial_putc(const char c) +{ + get_current()->putc(c); +} + +/** + * serial_puts() - Output string via currently selected serial port + * @s: Zero-terminated string to be output from the serial port. + * + * This function outputs a zero-terminated string via currently + * selected serial port. This function behaves as an accelerator + * in case the hardware can queue multiple characters for transfer. + * The whole string that is to be output is available to the function + * implementing the hardware manipulation. Transmitting the whole + * string may take some time, thus this function may block for some + * amount of time. This function uses the get_current() call to + * determine which port is selected. + */ +void serial_puts(const char *s) +{ + get_current()->puts(s); +} + +/** + * default_serial_puts() - Output string by calling serial_putc() in loop + * @s: Zero-terminated string to be output from the serial port. + * + * This function outputs a zero-terminated string by calling serial_putc() + * in a loop. Most drivers do not support queueing more than one byte for + * transfer, thus this function precisely implements their serial_puts(). + * + * To optimize the number of get_current() calls, this function only + * calls get_current() once and then directly accesses the putc() call + * of the &struct serial_device . + */ +void default_serial_puts(const char *s) +{ + struct serial_device *dev = get_current(); + while (*s) + dev->putc(*s++); +} + +#if CONFIG_POST & CONFIG_SYS_POST_UART +static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE; + +/** + * uart_post_test() - Test the currently selected serial port using POST + * @flags: POST framework flags + * + * Do a loopback test of the currently selected serial port. This + * function is only useful in the context of the POST testing framwork. + * The serial port is firstly configured into loopback mode and then + * characters are sent through it. + * + * Returns 0 on success, value otherwise. + */ +/* Mark weak until post/cpu/.../uart.c migrate over */ +__weak +int uart_post_test(int flags) +{ + unsigned char c; + int ret, saved_baud, b; + struct serial_device *saved_dev, *s; + + /* Save current serial state */ + ret = 0; + saved_dev = serial_current; + saved_baud = gd->baudrate; + + for (s = serial_devices; s; s = s->next) { + /* If this driver doesn't support loop back, skip it */ + if (!s->loop) + continue; + + /* Test the next device */ + serial_current = s; + + ret = serial_init(); + if (ret) + goto done; + + /* Consume anything that happens to be queued */ + while (serial_tstc()) + serial_getc(); + + /* Enable loop back */ + s->loop(1); + + /* Test every available baud rate */ + for (b = 0; b < ARRAY_SIZE(bauds); ++b) { + gd->baudrate = bauds[b]; + serial_setbrg(); + + /* + * Stick to printable chars to avoid issues: + * - terminal corruption + * - serial program reacting to sequences and sending + * back random extra data + * - most serial drivers add in extra chars (like \r\n) + */ + for (c = 0x20; c < 0x7f; ++c) { + /* Send it out */ + serial_putc(c); + + /* Make sure it's the same one */ + ret = (c != serial_getc()); + if (ret) { + s->loop(0); + goto done; + } + + /* Clean up the output in case it was sent */ + serial_putc('\b'); + ret = ('\b' != serial_getc()); + if (ret) { + s->loop(0); + goto done; + } + } + } + + /* Disable loop back */ + s->loop(0); + + /* XXX: There is no serial_stop() !? */ + if (s->stop) + s->stop(); + } + + done: + /* Restore previous serial state */ + serial_current = saved_dev; + gd->baudrate = saved_baud; + serial_reinit_all(); + serial_setbrg(); + + return ret; +} +#endif |