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b5c952e6b6
Add "(void) param;" annotation to address unused parameter warnings. Found with GCC's warning -Wunused-parameter.
299 lines
8.3 KiB
C
299 lines
8.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+-with-RTEMS-exception */
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/*
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* console driver for RTL22xx UARTs
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*
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* If you want the driver to be interrupt driven, you
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* need to write the ISR, and in the ISR insert the
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* chars into termios's queue.
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*/
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/*
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* Copyright (c) By ray <rayx.cn@gmail.com>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <bsp.h> /* Must be before libio.h */
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#include <rtems/libio.h>
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#include <termios.h>
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#include <rtems/bspIo.h>
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/* Put the CPU (or UART) specific header file #include here */
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#include <lpc22xx.h>
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#include "lpc22xx_uart.h"
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#include <libchip/serial.h>
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#include <libchip/sersupp.h>
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/* How many serial ports? */
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#define NUM_DEVS 1
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int dbg_dly;
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/* static function prototypes */
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static int uart_first_open(int major, int minor, void *arg);
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static int uart_last_close(int major, int minor, void *arg);
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static int uart_read(int minor);
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static ssize_t uart_write(int minor, const char *buf, size_t len);
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static void uart_init(int minor);
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static void uart_write_polled(int minor, char c);
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static int uart_set_attributes(int minor, const struct termios *t);
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/* These are used by code in console.c */
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unsigned long Console_Configuration_Count = NUM_DEVS;
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/* Pointers to functions for handling the UART. */
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const console_fns uart_fns = {
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libchip_serial_default_probe,
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uart_first_open,
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uart_last_close,
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uart_read,
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uart_write,
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uart_init,
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uart_write_polled, /* not used in this driver */
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uart_set_attributes,
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FALSE /* TRUE if interrupt driven, FALSE if not. */
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};
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/*
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* There's one item in array for each UART.
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*
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* Some of these fields are marked "NOT USED". They are not used
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* by console.c, but may be used by drivers in libchip
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*/
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console_tbl Console_Configuration_Ports[] = {
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{
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"/dev/com0", /* sDeviceName */
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SERIAL_CUSTOM, /* deviceType */
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&uart_fns, /* pDeviceFns */
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NULL, /* deviceProbe */
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NULL, /* pDeviceFlow */
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0, /* ulMargin - NOT USED */
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0, /* ulHysteresis - NOT USED */
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NULL, /* pDeviceParams */
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0, /* ulCtrlPort1 - NOT USED */
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0, /* ulCtrlPort2 - NOT USED */
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0, /* ulDataPort - NOT USED */
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NULL, /* getRegister - NOT USED */
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NULL, /* setRegister - NOT USED */
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NULL, /* getData - NOT USED */
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NULL, /* setData - NOT USED */
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0, /* ulClock - NOT USED */
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0 /* ulIntVector - NOT USED */
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}
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#if 0
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{
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"/dev/com1", /* sDeviceName */
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SERIAL_CUSTOM, /* deviceType */
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&uart_fns, /* pDeviceFns */
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NULL, /* deviceProbe */
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NULL, /* pDeviceFlow */
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0, /* ulMargin - NOT USED */
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0, /* ulHysteresis - NOT USED */
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NULL, /* pDeviceParams */
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0, /* ulCtrlPort1 - NOT USED */
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0, /* ulCtrlPort2 - NOT USED */
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0, /* ulDataPort - NOT USED */
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NULL, /* getRegister - NOT USED */
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NULL, /* setRegister - NOT USED */
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NULL, /* getData - NOT USED */
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NULL, /* setData - NOT USED */
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0, /* ulClock - NOT USED */
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0 /* ulIntVector - NOT USED */
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}
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#endif
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};
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/*
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* This is called the first time each device is opened. If the driver
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* is interrupt driven, you should enable interrupts here. Otherwise,
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* it's probably safe to do nothing.
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*
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* Since micromonitor already set up the UART, we do nothing.
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*/
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static int uart_first_open(int major, int minor, void *arg)
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{
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(void) major;
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(void) minor;
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(void) arg;
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return 0;
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}
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/*
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* This is called the last time each device is closed. If the driver
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* is interrupt driven, you should disable interrupts here. Otherwise,
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* it's probably safe to do nothing.
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*/
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static int uart_last_close(int major, int minor, void *arg)
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{
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(void) major;
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(void) minor;
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(void) arg;
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return 0;
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}
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/*
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* Read one character from UART.
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*
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* Return -1 if there's no data, otherwise return
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* the character in lowest 8 bits of returned int.
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*/
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static int uart_read(int minor)
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{
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char c;
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switch (minor) {
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case 0:
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if (U0LSR & ULSR_RDR) {
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c = U0RBR;
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return c;
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}
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return -1;
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case 1:
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if (U1LSR & ULSR_RDR) {
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c = U1RBR;
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return c;
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}
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return -1;
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default:
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break;
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}
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printk("Unknown console minor number %d\n", minor);
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return -1;
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}
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/*
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* Write buffer to UART
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*
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* return 1 on success, -1 on error
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*/
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static ssize_t uart_write(int minor, const char *buf, size_t len)
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{
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size_t i;
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switch (minor) {
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case 0:
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for (i = 0; i < len; i++) {
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while (!(U0LSR & ULSR_THRE)) /* wait for TX buffer to empty*/
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continue; /* also either WDOG() or swap()*/
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U0THR = (char) buf[i];
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}
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break;
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case 1:
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for (i = 0; i < len; i++) {
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while (!(U0LSR & ULSR_THRE)) /* wait for TX buffer to empty*/
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continue; /* also either WDOG() or swap()*/
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U0THR = (char) buf[i];
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}
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break;
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default:
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printk("Unknown console minor number %d\n", minor);
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return -1;
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}
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return len;
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}
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/* Set up the UART. */
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static void uart_init(int minor)
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{
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(void) minor;
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#if 0 //init will be done in bspstart.c
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int baud=6;
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int mode =0x03;
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if(minor==0){
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// set port pins for UART0
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PINSEL0 = (PINSEL0 & ~U0_PINMASK) | U0_PINSEL;
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U0IER = 0x00; // disable all interrupts
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// set the baudrate
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U0LCR = 1<<7; // select divisor latches
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U0DLL = (uint8_t)baud; // set for baud low byte
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U0DLM = (uint8_t)(baud >> 8); // set for baud high byte
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// set the number of characters and other
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// user specified operating parameters
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U0LCR = (mode & ~ULCR_DLAB_ENABLE);
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U0FCR = mode>>8; /*fifo mode*/
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// set port pins for UART1
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PINSEL0 = (PINSEL0 & ~U1_PINMASK) | U1_PINSEL;
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U1IER = 0x00; // disable all interrupts
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}else if(minor==1){
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// set the baudrate
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U1LCR = ULCR_DLAB_ENABLE; // select divisor latches
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U1DLL = (uint8_t)baud; // set for baud low byte
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U1DLM = (uint8_t)(baud >> 8); // set for baud high byte
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// set the number of characters and other
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// user specified operating parameters
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U1LCR = (mode & ~ULCR_DLAB_ENABLE);
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U1FCR = mode>>8;/*fifo mode*/
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}
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#endif
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}
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/* I'm not sure this is needed for the shared console driver. */
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static void uart_write_polled(int minor, char c)
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{
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uart_write(minor, &c, 1);
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}
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/* This is for setting baud rate, bits, etc. */
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static int uart_set_attributes(int minor, const struct termios *t)
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{
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(void) minor;
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(void) t;
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return 0;
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}
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/*
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* Write a character to the console. This is used by printk() and
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* maybe other low level functions. It should not use interrupts or any
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* RTEMS system calls. It needs to be very simple
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*/
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static void _BSP_put_char( char c )
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{
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uart_write_polled(0, c);
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}
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BSP_output_char_function_type BSP_output_char = _BSP_put_char;
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static int _BSP_get_char(void)
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{
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return uart_read(0);
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}
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BSP_polling_getchar_function_type BSP_poll_char = _BSP_get_char;
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/*
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* init USART 0: 8 bit, 1 Stop,No checkout, BPS115200
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*/
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void UART0_Ini(void)
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{
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long Fdiv;
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int i;
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PINSEL0 = 0x00000005; // I/O to UART0
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U0LCR = 0x83; // DLAB = 1
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Fdiv = (Fpclk >>4) / UART_BPS; // configure BPS
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U0DLM = Fdiv/256;
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U0DLL = Fdiv%256;
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U0LCR = 0x03;
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for(i=0;i<10;i++){
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U0THR = 67; //send a C to see if is OK
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while ( (U0LSR&0x40)==0 );
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}
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}
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