mirror of
https://github.com/AsahiLinux/u-boot
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44fa676e58
This patch adds non-DM version for mtk hsuart driver and makes it compatible with ns16550a driver in configuration. This is needed in SPL with CONFIG_SPL_DM disabled for reducing size. Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
550 lines
14 KiB
C
550 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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#include <common.h>
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#include <env_internal.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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* @name: changed environment variable
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* @value: new value of the environment variable
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* @op: operation (create, overwrite, or delete)
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* @flags: attributes of environment variable change,
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* see flags H_* in include/search.h
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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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* Return: 0 on success, 1 on error
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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(atmel_serial_initialize);
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serial_initfunc(mcf_serial_initialize);
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serial_initfunc(mpc85xx_serial_initialize);
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serial_initfunc(mxc_serial_initialize);
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serial_initfunc(ns16550_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(sh_serial_initialize);
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serial_initfunc(mtk_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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atmel_serial_initialize();
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mcf_serial_initialize();
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mpc85xx_serial_initialize();
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mxc_serial_initialize();
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ns16550_serial_initialize();
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pl01x_serial_initialize();
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pxa_serial_initialize();
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sh_serial_initialize();
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mtk_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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static 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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static 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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*/
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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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if (!(gd->flags & GD_FLG_RELOC))
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dev = default_serial_console();
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else if (!serial_current)
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dev = default_serial_console();
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else
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dev = serial_current;
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/* We must have a console device */
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if (!dev) {
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#ifdef CONFIG_SPL_BUILD
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puts("Cannot find console\n");
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hang();
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#else
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panic("Cannot find console\n");
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#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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*
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* This function initializes the currently selected serial port. This
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* usually involves setting up the registers of that particular port,
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* enabling clock and such. This function uses the get_current() call
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* to determine which port is selected.
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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_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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}
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/**
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* serial_setbrg() - Configure baud-rate of currently selected serial port
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*
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* This function configures the baud-rate of the currently selected
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* serial port. The baud-rate is retrieved from global data within
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* the serial port driver. This function uses the get_current() call
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* to determine which port is selected.
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*
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* Returns 0 on success, negative on error.
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*/
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void serial_setbrg(void)
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{
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get_current()->setbrg();
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}
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/**
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* serial_getc() - Read character from currently selected serial port
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*
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* This function retrieves a character from currently selected serial
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* port. In case there is no character waiting on the serial port,
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* this function will block and wait for the character to appear. This
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* function uses the get_current() call to determine which port is
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* selected.
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*
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* Returns the character on success, negative on error.
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*/
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int serial_getc(void)
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{
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return get_current()->getc();
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}
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/**
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* serial_tstc() - Test if data is available on currently selected serial port
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*
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* This function tests if one or more characters are available on
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* currently selected serial port. This function never blocks. This
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* function uses the get_current() call to determine which port is
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* selected.
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*
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* Returns positive if character is available, zero otherwise.
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*/
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int serial_tstc(void)
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{
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return get_current()->tstc();
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}
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/**
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* serial_putc() - Output character via currently selected serial port
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* @c: Single character to be output from the serial port.
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*
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* This function outputs a character via currently selected serial
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* port. This character is passed to the serial port driver responsible
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* for controlling the hardware. The hardware may still be in process
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* of transmitting another character, therefore this function may block
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* for a short amount of time. This function uses the get_current()
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* call to determine which port is selected.
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*/
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void serial_putc(const char c)
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{
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get_current()->putc(c);
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}
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/**
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* serial_puts() - Output string via currently selected serial port
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* @s: Zero-terminated string to be output from the serial port.
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*
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* This function outputs a zero-terminated string via currently
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* selected serial port. This function behaves as an accelerator
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* in case the hardware can queue multiple characters for transfer.
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* The whole string that is to be output is available to the function
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* implementing the hardware manipulation. Transmitting the whole
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* string may take some time, thus this function may block for some
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* amount of time. This function uses the get_current() call to
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* determine which port is selected.
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*/
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void serial_puts(const char *s)
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{
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get_current()->puts(s);
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}
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/**
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* default_serial_puts() - Output string by calling serial_putc() in loop
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* @s: Zero-terminated string to be output from the serial port.
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*
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* This function outputs a zero-terminated string by calling serial_putc()
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* in a loop. Most drivers do not support queueing more than one byte for
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* transfer, thus this function precisely implements their serial_puts().
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*
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* To optimize the number of get_current() calls, this function only
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* calls get_current() once and then directly accesses the putc() call
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* of the &struct serial_device .
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*/
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void default_serial_puts(const char *s)
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{
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struct serial_device *dev = get_current();
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while (*s)
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dev->putc(*s++);
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}
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#if CONFIG_POST & CONFIG_SYS_POST_UART
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static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
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/**
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* uart_post_test() - Test the currently selected serial port using POST
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* @flags: POST framework flags
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*
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* Do a loopback test of the currently selected serial port. This
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* function is only useful in the context of the POST testing framwork.
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* The serial port is first configured into loopback mode and then
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* characters are sent through it.
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*
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* Returns 0 on success, value otherwise.
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*/
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/* Mark weak until post/cpu/.../uart.c migrate over */
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__weak
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int uart_post_test(int flags)
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{
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unsigned char c;
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int ret, saved_baud, b;
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struct serial_device *saved_dev, *s;
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/* Save current serial state */
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ret = 0;
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saved_dev = serial_current;
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saved_baud = gd->baudrate;
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for (s = serial_devices; s; s = s->next) {
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/* If this driver doesn't support loop back, skip it */
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if (!s->loop)
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continue;
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/* Test the next device */
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serial_current = s;
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ret = serial_init();
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if (ret)
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goto done;
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/* Consume anything that happens to be queued */
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while (serial_tstc())
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serial_getc();
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/* Enable loop back */
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s->loop(1);
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/* Test every available baud rate */
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for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
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gd->baudrate = bauds[b];
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serial_setbrg();
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/*
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* Stick to printable chars to avoid issues:
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* - terminal corruption
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* - serial program reacting to sequences and sending
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* back random extra data
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* - most serial drivers add in extra chars (like \r\n)
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*/
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for (c = 0x20; c < 0x7f; ++c) {
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/* Send it out */
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serial_putc(c);
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/* Make sure it's the same one */
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ret = (c != serial_getc());
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if (ret) {
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s->loop(0);
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goto done;
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}
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/* Clean up the output in case it was sent */
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serial_putc('\b');
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ret = ('\b' != serial_getc());
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if (ret) {
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s->loop(0);
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goto done;
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}
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}
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}
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/* Disable loop back */
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s->loop(0);
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/* XXX: There is no serial_stop() !? */
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if (s->stop)
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s->stop();
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}
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done:
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/* Restore previous serial state */
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serial_current = saved_dev;
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gd->baudrate = saved_baud;
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serial_reinit_all();
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serial_setbrg();
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return ret;
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}
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#endif
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