forked from Imagelibrary/rtems
153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
/**
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* @file
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*
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* @ingroup generic_or1k_uart
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*
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* @brief UART support.
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*/
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/*
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* COPYRIGHT (c) 2014-2015 Hesham ALMatary <heshamelmatary@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 <libchip/sersupp.h>
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#include <bsp/generic_or1k.h>
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#include <bsp.h>
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#include <bsp/irq.h>
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#include <bsp/uart.h>
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#include <rtems/score/isr.h>
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static void uart_initialize(int minor);
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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_polled(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_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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#if 0
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/*
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* These will be useful when the driver supports interrupt driven IO.
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*/
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static rtems_vector_number uart_get_irq_number(const console_tbl *ct)
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{
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return ct->ulIntVector;
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}
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static uint32_t uart_get_baud(const console_tbl *ct)
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{
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return ct->ulClock;
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}
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#endif
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static void uart_set_baud(int baud)
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{
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uint16_t divisor = (OR1K_BSP_CLOCK_FREQ) / (16 * baud);
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OR1K_REG(OR1K_BSP_UART_REG_LINE_CTRL) =
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OR1K_BSP_UART_REG_LINE_CTRL_DLAB;
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OR1K_REG(OR1K_BSP_UART_REG_DEV_LATCH_LOW) = divisor & 0xff;
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OR1K_REG(OR1K_BSP_UART_REG_DEV_LATCH_HIGH) =
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(divisor >> 8);
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}
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static void uart_initialize(int minor)
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{
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/* Set baud rate */
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uart_set_baud(OR1K_UART_DEFAULT_BAUD);
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/* Set data pattern configuration */
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OR1K_REG(OR1K_BSP_UART_REG_LINE_CTRL) =
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OR1K_BSP_UART_REG_LINE_CTRL_WLEN8;
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/* Reset receiver and transmitter */
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OR1K_REG(OR1K_BSP_UART_REG_FIFO_CTRL) =
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OR1K_BSP_UART_REG_FIFO_CTRL_ENABLE_FIFO |
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OR1K_BSP_UART_REG_FIFO_CTRL_CLEAR_RCVR |
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OR1K_BSP_UART_REG_FIFO_CTRL_TRIGGER_14;
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/* Disable all interrupts */
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OR1K_REG(OR1K_BSP_UART_REG_INT_ENABLE) = 0x00;
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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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rtems_libio_open_close_args_t *oc = (rtems_libio_open_close_args_t *) arg;
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struct rtems_termios_tty *tty = (struct rtems_termios_tty *) oc->iop->data1;
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const console_tbl *ct = Console_Port_Tbl [minor];
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console_data *cd = &Console_Port_Data [minor];
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cd->termios_data = tty;
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rtems_termios_set_initial_baud(tty, ct->ulClock);
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return 0;
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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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static int uart_read_polled(int minor)
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{
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unsigned char lsr;
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/* Get a character when avaiable */
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do {
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lsr = OR1K_REG(OR1K_BSP_UART_REG_LINE_STATUS);
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} while ((lsr & OR1K_BSP_UART_REG_LINE_STATUS_DR)
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!= OR1K_BSP_UART_REG_LINE_STATUS_DR);
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return OR1K_REG(OR1K_BSP_UART_REG_RX);
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}
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static void uart_write_polled(int minor, char c)
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{
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unsigned char lsr;
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/* Wait until there is no pending data in the transmitter FIFO (empty) */
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do {
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lsr = OR1K_REG(OR1K_BSP_UART_REG_LINE_STATUS);
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} while (!(lsr & OR1K_BSP_UART_REG_LINE_STATUS_THRE));
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OR1K_REG(OR1K_BSP_UART_REG_TX) = c;
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}
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static ssize_t uart_write(
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int minor,
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const char *s,
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size_t n
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)
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{
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ssize_t i = 0;
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for (i = 0; i < n; ++i){
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uart_write_polled(minor, s [i]);
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}
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return n;
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}
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static int uart_set_attributes(int minor, const struct termios *term)
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{
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return -1;
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}
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const console_fns generic_or1k_uart_fns = {
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.deviceProbe = libchip_serial_default_probe,
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.deviceFirstOpen = uart_first_open,
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.deviceLastClose = uart_last_close,
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.deviceRead = uart_read_polled,
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.deviceWrite = uart_write,
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.deviceInitialize = uart_initialize,
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.deviceWritePolled = uart_write_polled,
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.deviceSetAttributes = uart_set_attributes,
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.deviceOutputUsesInterrupts = false
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};
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