forked from Imagelibrary/rtems
bsps: Move console drivers to bsps
This patch is a part of the BSP source reorganization. Update #3285.
This commit is contained in:
Sebastian Huber
242
bsps/arm/smdk2410/console/uart.c
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242
bsps/arm/smdk2410/console/uart.c
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/*
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* console driver for S3C2400 UARTs
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*
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* This driver uses the shared console driver in
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* ...../libbsp/shared/console.c
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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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* Copyright (c) 2004 Cogent Computer Systems
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* Written by Jay Monkman <jtm@lopingdog.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 <s3c24xx.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 uart_poll_read(int minor);
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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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{
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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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*/
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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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};
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/*********************************************************************/
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/* Functions called via termios callbacks (i.e. the ones in uart_fns */
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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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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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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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if (minor == 0) {
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if (rUTRSTAT0 & 0x1) {
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c = rURXH0 & 0xff;
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return c;
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} else {
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return -1;
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}
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} else {
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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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/*
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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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int i;
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if (minor == 0) {
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for (i = 0; i < len; i++) {
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/* Wait for fifo to have room */
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while(!(rUTRSTAT0 & 0x2)) {
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continue;
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}
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rUTXH0 = (char) buf[i];
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}
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} else {
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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 1;
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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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int i;
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unsigned int reg = 0;
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/* enable UART0 */
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rCLKCON|=0x100;
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/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
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reg = get_PCLK() / (16 * 115200) - 1;
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/* FIFO enable, Tx/Rx FIFO clear */
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rUFCON0 = 0x07;
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rUMCON0 = 0x0;
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/* Normal,No parity,1 stop,8 bit */
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rULCON0 = 0x3;
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/*
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* tx=level,rx=edge,disable timeout int.,enable rx error int.,
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* normal,interrupt or polling
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*/
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rUCON0 = 0x245;
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rUBRDIV0 = reg;
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for (i = 0; i < 100; i++);
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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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return 0;
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}
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/***********************************************************************/
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/*
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* The following functions are not used by TERMIOS, but other RTEMS
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* functions use them instead.
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*/
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/***********************************************************************/
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/*
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* Read from UART. This is used in the exit code, and can't
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* rely on interrupts.
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*/
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int uart_poll_read(int minor)
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{
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return uart_read(minor);
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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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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_poll_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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