avionic design with actual uboot and tooling
submodule of avionic design uboot bootloader and with included tools to get you started , read readme.md and readme-tk1-loader.md
This commit is contained in:
617
u-boot/drivers/serial/serial.c
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617
u-boot/drivers/serial/serial.c
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@@ -0,0 +1,617 @@
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/*
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* (C) Copyright 2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <environment.h>
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#include <serial.h>
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#include <stdio_dev.h>
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#include <post.h>
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#include <linux/compiler.h>
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#include <errno.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct serial_device *serial_devices;
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static struct serial_device *serial_current;
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/*
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* Table with supported baudrates (defined in config_xyz.h)
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*/
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static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
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/**
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* serial_null() - Void registration routine of a serial driver
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*
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* This routine implements a void registration routine of a serial
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* driver. The registration routine of a particular driver is aliased
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* to this empty function in case the driver is not compiled into
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* U-Boot.
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*/
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static void serial_null(void)
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{
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}
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/**
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* on_baudrate() - Update the actual baudrate when the env var changes
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*
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* This will check for a valid baudrate and only apply it if valid.
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*/
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static int on_baudrate(const char *name, const char *value, enum env_op op,
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int flags)
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{
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int i;
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int baudrate;
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switch (op) {
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case env_op_create:
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case env_op_overwrite:
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/*
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* Switch to new baudrate if new baudrate is supported
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*/
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baudrate = simple_strtoul(value, NULL, 10);
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/* Not actually changing */
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if (gd->baudrate == baudrate)
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return 0;
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for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
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if (baudrate == baudrate_table[i])
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break;
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}
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if (i == ARRAY_SIZE(baudrate_table)) {
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if ((flags & H_FORCE) == 0)
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printf("## Baudrate %d bps not supported\n",
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baudrate);
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return 1;
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}
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if ((flags & H_INTERACTIVE) != 0) {
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printf("## Switch baudrate to %d"
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" bps and press ENTER ...\n", baudrate);
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udelay(50000);
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}
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gd->baudrate = baudrate;
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serial_setbrg();
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udelay(50000);
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if ((flags & H_INTERACTIVE) != 0)
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while (1) {
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if (getc() == '\r')
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break;
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}
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return 0;
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case env_op_delete:
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printf("## Baudrate may not be deleted\n");
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return 1;
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default:
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return 0;
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}
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}
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U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
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/**
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* serial_initfunc() - Forward declare of driver registration routine
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* @name: Name of the real driver registration routine.
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*
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* This macro expands onto forward declaration of a driver registration
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* routine, which is then used below in serial_initialize() function.
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* The declaration is made weak and aliases to serial_null() so in case
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* the driver is not compiled in, the function is still declared and can
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* be used, but aliases to serial_null() and thus is optimized away.
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*/
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#define serial_initfunc(name) \
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void name(void) \
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__attribute__((weak, alias("serial_null")));
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serial_initfunc(amirix_serial_initialize);
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serial_initfunc(arc_serial_initialize);
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serial_initfunc(arm_dcc_initialize);
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serial_initfunc(asc_serial_initialize);
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serial_initfunc(atmel_serial_initialize);
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serial_initfunc(au1x00_serial_initialize);
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serial_initfunc(bfin_jtag_initialize);
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serial_initfunc(bfin_serial_initialize);
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serial_initfunc(bmw_serial_initialize);
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serial_initfunc(clps7111_serial_initialize);
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serial_initfunc(cogent_serial_initialize);
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serial_initfunc(cpci750_serial_initialize);
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serial_initfunc(evb64260_serial_initialize);
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serial_initfunc(imx_serial_initialize);
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serial_initfunc(iop480_serial_initialize);
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serial_initfunc(jz_serial_initialize);
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serial_initfunc(leon2_serial_initialize);
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serial_initfunc(leon3_serial_initialize);
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serial_initfunc(lh7a40x_serial_initialize);
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serial_initfunc(lpc32xx_serial_initialize);
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serial_initfunc(marvell_serial_initialize);
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serial_initfunc(max3100_serial_initialize);
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serial_initfunc(mcf_serial_initialize);
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serial_initfunc(ml2_serial_initialize);
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serial_initfunc(mpc512x_serial_initialize);
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serial_initfunc(mpc5xx_serial_initialize);
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serial_initfunc(mpc8260_scc_serial_initialize);
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serial_initfunc(mpc8260_smc_serial_initialize);
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serial_initfunc(mpc85xx_serial_initialize);
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serial_initfunc(mpc8xx_serial_initialize);
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serial_initfunc(mxc_serial_initialize);
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serial_initfunc(mxs_auart_initialize);
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serial_initfunc(ns16550_serial_initialize);
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serial_initfunc(oc_serial_initialize);
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serial_initfunc(p3mx_serial_initialize);
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serial_initfunc(pl01x_serial_initialize);
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serial_initfunc(pxa_serial_initialize);
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serial_initfunc(s3c24xx_serial_initialize);
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serial_initfunc(s5p_serial_initialize);
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serial_initfunc(sa1100_serial_initialize);
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serial_initfunc(sandbox_serial_initialize);
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serial_initfunc(sconsole_serial_initialize);
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serial_initfunc(sh_serial_initialize);
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serial_initfunc(stm32_serial_initialize);
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serial_initfunc(uartlite_serial_initialize);
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serial_initfunc(zynq_serial_initialize);
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/**
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* serial_register() - Register serial driver with serial driver core
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* @dev: Pointer to the serial driver structure
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*
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* This function registers the serial driver supplied via @dev with
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* serial driver core, thus making U-Boot aware of it and making it
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* available for U-Boot to use. On platforms that still require manual
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* relocation of constant variables, relocation of the supplied structure
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* is performed.
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*/
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void serial_register(struct serial_device *dev)
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{
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#ifdef CONFIG_NEEDS_MANUAL_RELOC
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if (dev->start)
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dev->start += gd->reloc_off;
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if (dev->stop)
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dev->stop += gd->reloc_off;
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if (dev->setbrg)
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dev->setbrg += gd->reloc_off;
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if (dev->getc)
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dev->getc += gd->reloc_off;
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if (dev->tstc)
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dev->tstc += gd->reloc_off;
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if (dev->putc)
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dev->putc += gd->reloc_off;
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if (dev->puts)
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dev->puts += gd->reloc_off;
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#endif
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dev->next = serial_devices;
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serial_devices = dev;
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}
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/**
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* serial_initialize() - Register all compiled-in serial port drivers
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*
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* This function registers all serial port drivers that are compiled
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* into the U-Boot binary with the serial core, thus making them
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* available to U-Boot to use. Lastly, this function assigns a default
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* serial port to the serial core. That serial port is then used as a
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* default output.
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*/
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void serial_initialize(void)
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{
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amirix_serial_initialize();
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arc_serial_initialize();
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arm_dcc_initialize();
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asc_serial_initialize();
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atmel_serial_initialize();
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au1x00_serial_initialize();
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bfin_jtag_initialize();
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bfin_serial_initialize();
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bmw_serial_initialize();
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clps7111_serial_initialize();
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cogent_serial_initialize();
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cpci750_serial_initialize();
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evb64260_serial_initialize();
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imx_serial_initialize();
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iop480_serial_initialize();
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jz_serial_initialize();
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leon2_serial_initialize();
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leon3_serial_initialize();
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lh7a40x_serial_initialize();
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lpc32xx_serial_initialize();
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marvell_serial_initialize();
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max3100_serial_initialize();
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mcf_serial_initialize();
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ml2_serial_initialize();
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mpc512x_serial_initialize();
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mpc5xx_serial_initialize();
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mpc8260_scc_serial_initialize();
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mpc8260_smc_serial_initialize();
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mpc85xx_serial_initialize();
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mpc8xx_serial_initialize();
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mxc_serial_initialize();
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mxs_auart_initialize();
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ns16550_serial_initialize();
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oc_serial_initialize();
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p3mx_serial_initialize();
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pl01x_serial_initialize();
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pxa_serial_initialize();
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s3c24xx_serial_initialize();
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s5p_serial_initialize();
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sa1100_serial_initialize();
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sandbox_serial_initialize();
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sconsole_serial_initialize();
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sh_serial_initialize();
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stm32_serial_initialize();
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uartlite_serial_initialize();
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zynq_serial_initialize();
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serial_assign(default_serial_console()->name);
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}
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static int serial_stub_start(struct stdio_dev *sdev)
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{
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struct serial_device *dev = sdev->priv;
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return dev->start();
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}
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static int serial_stub_stop(struct stdio_dev *sdev)
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{
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struct serial_device *dev = sdev->priv;
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return dev->stop();
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}
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static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
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{
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struct serial_device *dev = sdev->priv;
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dev->putc(ch);
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}
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static void serial_stub_puts(struct stdio_dev *sdev, const char *str)
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{
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struct serial_device *dev = sdev->priv;
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dev->puts(str);
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}
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int serial_stub_getc(struct stdio_dev *sdev)
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{
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struct serial_device *dev = sdev->priv;
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return dev->getc();
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}
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int serial_stub_tstc(struct stdio_dev *sdev)
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{
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struct serial_device *dev = sdev->priv;
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return dev->tstc();
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}
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/**
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* serial_stdio_init() - Register serial ports with STDIO core
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*
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* This function generates a proxy driver for each serial port driver.
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* These proxy drivers then register with the STDIO core, making the
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* serial drivers available as STDIO devices.
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*/
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void serial_stdio_init(void)
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{
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struct stdio_dev dev;
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struct serial_device *s = serial_devices;
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while (s) {
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memset(&dev, 0, sizeof(dev));
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strcpy(dev.name, s->name);
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dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
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dev.start = serial_stub_start;
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dev.stop = serial_stub_stop;
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dev.putc = serial_stub_putc;
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dev.puts = serial_stub_puts;
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dev.getc = serial_stub_getc;
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dev.tstc = serial_stub_tstc;
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dev.priv = s;
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stdio_register(&dev);
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s = s->next;
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}
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}
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/**
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* serial_assign() - Select the serial output device by name
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* @name: Name of the serial driver to be used as default output
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*
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* This function configures the serial output multiplexing by
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* selecting which serial device will be used as default. In case
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* the STDIO "serial" device is selected as stdin/stdout/stderr,
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* the serial device previously configured by this function will be
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* used for the particular operation.
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*
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* Returns 0 on success, negative on error.
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*/
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int serial_assign(const char *name)
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{
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struct serial_device *s;
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for (s = serial_devices; s; s = s->next) {
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if (strcmp(s->name, name))
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continue;
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serial_current = s;
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return 0;
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}
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return -EINVAL;
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}
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/**
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* serial_reinit_all() - Reinitialize all compiled-in serial ports
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*
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* This function reinitializes all serial ports that are compiled
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* into U-Boot by calling their serial_start() functions.
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*/
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void serial_reinit_all(void)
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{
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struct serial_device *s;
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for (s = serial_devices; s; s = s->next)
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s->start();
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}
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/**
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* get_current() - Return pointer to currently selected serial port
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*
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* This function returns a pointer to currently selected serial port.
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* The currently selected serial port is altered by serial_assign()
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* function.
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*
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* In case this function is called before relocation or before any serial
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||||
* port is configured, this function calls default_serial_console() to
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* determine the serial port. Otherwise, the configured serial port is
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* returned.
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*
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* Returns pointer to the currently selected serial port on success,
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* NULL on error.
|
||||
*/
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static struct serial_device *get_current(void)
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{
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||||
struct serial_device *dev;
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|
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if (!(gd->flags & GD_FLG_RELOC))
|
||||
dev = default_serial_console();
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else if (!serial_current)
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dev = default_serial_console();
|
||||
else
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||||
dev = serial_current;
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||||
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||||
/* We must have a console device */
|
||||
if (!dev) {
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||||
#ifdef CONFIG_SPL_BUILD
|
||||
puts("Cannot find console\n");
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||||
hang();
|
||||
#else
|
||||
panic("Cannot find console\n");
|
||||
#endif
|
||||
}
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||||
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return dev;
|
||||
}
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||||
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/**
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||||
* serial_init() - Initialize currently selected serial port
|
||||
*
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||||
* 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.
|
||||
*/
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||||
int serial_init(void)
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||||
{
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||||
gd->flags |= GD_FLG_SERIAL_READY;
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||||
return get_current()->start();
|
||||
}
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||||
|
||||
/**
|
||||
* 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 first 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
|
||||
Reference in New Issue
Block a user