+++ /dev/null
-/*
- * Copyright (c) 2013 Qualcomm Atheros, Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted (subject to the limitations in the
- * disclaimer below) provided that the following conditions are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the
- * distribution.
- *
- * * Neither the name of Qualcomm Atheros nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
- * GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
- * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
- * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
- * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-/*
- * $Id: //depot/sw/branches/fusion_usb/target_firmware/magpie_fw_dev/build/magpie_1_1/sboot/cmnos/uart/src/uart_api.c#1 $
- *
- * This file contains UART functions
- */
-#include "sys_cfg.h"
-
-#if SYSTEM_MODULE_UART
-
-#include "athos_api.h"
-
-//static global control block
-//
-static struct uart_blk uart_ctl_blk;
-
-static void _uart_hwinit(uint32_t freq, uint32_t baud);
-
-/*!- Initialize UART
- *
- */
-uint32_t
-_uart_init(void)
-{
- /*! Initialize UART hardware */
- uint32_t _lcr;
-
- /* Disable port interrupts while changing hardware */
- UART_REG_WRITE(IER_OFFSET, 0);
-
- /* Set databits, stopbits and parity. */
- _lcr = LCR_CLS_SET(3) | LCR_STOP_SET(0) | LCR_PEN_SET(0);
- UART_REG_WRITE(LCR_OFFSET, _lcr);
-
- /* Set baud rate. */
- _uart_hwinit(A_REFCLK_SPEED_GET(), UART_DEFAULT_BAUD);
-// _uart_hwinit(A_REFCLK_SPEED_GET(), 115200);
- //_uart_hwinit(SYSTEM_CLK, UART_DEFAULT_BAUD);
-
- /* Don't allow interrupts. */
- UART_REG_WRITE(IER_OFFSET, 0);
-
- /*
- * Enable and clear FIFO.
- * We don't really use the FIFO for output, but it might still
- * be useful for input.
- */
- UART_REG_WRITE(FCR_OFFSET,
- (FCR_FIFO_EN_SET(1) |
- FCR_RCVR_FIFO_RST_SET(1) |
- FCR_XMIT_FIFO_RST_SET(1)));
-
- /*! Initialize UART software buffer */
- uart_ctl_blk._tx.start_index = 0;
- uart_ctl_blk._tx.end_index = 0;
-}
-
-
-/*!- dummy put character
- *
- */
-void
-_uart_char_put_nothing(uint8_t ch)
-{
- // do nothing
-}
-
-
-/*!- dummy get character
- *
- */
-uint16_t
-_uart_char_get_nothing(uint8_t* ch)
-{
- return 0; //return FALSE;
-}
-
-
-/*!- Put a character
- *
- */
-void
-_uart_char_put(uint8_t ch)
-{
-#if USE_POST_BUFFER
- uint16_t index;
- uint32_t count = 0;
-
- index = (uart_ctl_blk._tx.end_index+1) & (UART_FIFO_SIZE-1);
- if(index == uart_ctl_blk._tx.start_index) {
- while (1) {
- _uart_task();
- index = (uart_ctl_blk._tx.end_index+1) & (UART_FIFO_SIZE-1);
- if (index != uart_ctl_blk._tx.start_index) {
- break;
- }
- if (count++ > 100000) {
- /*! If Tx buffer is full, uart_underrun_t++, return FALSE */
- uart_ctl_blk._tx.overrun_err++;
- return;
- }
- }
- }
- uart_ctl_blk._tx.buf[uart_ctl_blk._tx.end_index] = ch;
- uart_ctl_blk._tx.end_index = index;
-#else
- /*! If Tx buffer is full, uart_underrun_t++, return FALSE */
- uint32_t lsr;
- int i;
-
- for (i=0; i<UART_RETRY_COUNT; i++) {
- lsr = UART_REG_READ(LSR_OFFSET);
- if (lsr & LSR_THRE_MASK) {
- break;
- }
- }
-
- /*! Now, the transmit buffer is empty, put to tx buffer */
- UART_REG_WRITE(THR_OFFSET, ch);
-
- /*
- * Hang around until the character has been safely sent.
- * If we don't do this, the system could go to sleep, which
- * causes the UART's clock to stop, and we won't see output
- * that's stuck in the FIFO.
- */
- for (i=0; i<UART_RETRY_COUNT; i++) {
- lsr = UART_REG_READ(LSR_OFFSET);
- if (lsr & LSR_TEMT_MASK) {
- break;
- }
- }
-#endif
-
-}
-
-/*!- Put a character
- *
- */
-void
-_uart_char_put_nowait(uint8_t ch)
-{
-
- /*! If Tx buffer is full, uart_underrun_t++, return FALSE */
- uint32_t lsr;
- int i;
-
- for (i=0; i<UART_RETRY_COUNT; i++) {
- lsr = UART_REG_READ(LSR_OFFSET);
- if (lsr & LSR_THRE_MASK) {
- break;
- }
- }
-
- /*! Now, the transmit buffer is empty, put to tx buffer */
- UART_REG_WRITE(THR_OFFSET, ch);
-
- /*
- * Hang around until the character has been safely sent.
- * If we don't do this, the system could go to sleep, which
- * causes the UART's clock to stop, and we won't see output
- * that's stuck in the FIFO.
- */
- for (i=0; i<UART_RETRY_COUNT; i++) {
- lsr = UART_REG_READ(LSR_OFFSET);
- if (lsr & LSR_TEMT_MASK) {
- break;
- }
- }
-
-}
-
-
-/*!- Get a character
- *
- */
-uint16_t
-_uart_char_get(uint8_t* ch)
-{
-
- /*! If Rx FIFO is not empty, get char from Rx buffer, reutnr TRUE */
- if ((UART_REG_READ(LSR_OFFSET) & LSR_DR_MASK) != 0)
- {
- *ch = UART_REG_READ(RBR_OFFSET);
- return 1;
- }
- /*! Else return FALSE */
- else
- {
- return 0;
- }
-}
-
-/*!- UART task
- *
- */
-void
-_uart_task(void)
-{
-#if USE_POST_BUFFER
- uint16_t count;
- volatile uint32_t lsr;
-
- /*! If Tx FIFO almost empty, move chars from Tx buffer to Tx FIFO */
- lsr = UART_REG_READ(LSR_OFFSET);
- if ((lsr & LSR_THRE_MASK) != 0) { //Transmitter holding register empty
- count = 0;
- while (count<16) {
- if (uart_ctl_blk._tx.start_index != uart_ctl_blk._tx.end_index) {
- UART_REG_WRITE(THR_OFFSET, uart_ctl_blk._tx.buf[uart_ctl_blk._tx.start_index]);
- uart_ctl_blk._tx.start_index = (uart_ctl_blk._tx.start_index+1)
- & (UART_FIFO_SIZE-1);
- }
- else
- {
- break;
- }
- count++;
- }
- }
-#endif
- return;
-}
-
-
-
- uint32_t
-_uart_status()
-{
- return uart_ctl_blk._tx.overrun_err;
-}
-
-/*!- Output a string
- *
- */
-void
-_uart_str_out(uint8_t* str)
-{
- uint32_t i = 0;
-
- if( !uart_ctl_blk.debug_mode )
- return;
-
- while (str[i] != 0) {
- _uart_char_put(str[i]);
- i++;
- }
- return;
-}
-
-/*!- enable or disable put/get
- *
- */
-void
-_uart_config(uint16_t flag)
-{
- if( uart_ctl_blk.debug_mode != flag )
- {
- uart_ctl_blk.debug_mode = !uart_ctl_blk.debug_mode;
-
- // debug mode enable
- if( uart_ctl_blk.debug_mode )
- uart_ctl_blk._uart->_uart_char_put = _uart_char_put;
- else
- // debug mode enable
- uart_ctl_blk._uart->_uart_char_put = _uart_char_put_nothing;
- }
-}
-
-/*!- Set baudrate
- *
- */
-void
-_uart_hwinit(uint32_t freq, uint32_t baud)
-{
- uint32_t _lcr;
- uint32_t baud_divisor = freq/16/baud;
-
- _lcr = UART_REG_READ(LCR_OFFSET);
- _lcr |= LCR_DLAB_SET(1);
- UART_REG_WRITE(LCR_OFFSET, _lcr);
-
- UART_REG_WRITE(DLH_OFFSET, baud_divisor >> 8);
- UART_REG_WRITE(DLL_OFFSET, baud_divisor & 0xff);
-
- _lcr &= ~LCR_DLAB_SET(1);
- UART_REG_WRITE(LCR_OFFSET, _lcr);
-}
-
-/********** EXPORT function ***********/
-
-/*!- Install the function table
- *
- */
-void cmnos_uart_module_install(struct uart_api *apis)
-{
- /* hook in APIs */
- apis->_uart_init = _uart_init;
- apis->_uart_char_put = _uart_char_put;
- apis->_uart_char_get = _uart_char_get;
- apis->_uart_str_out = _uart_str_out;
- apis->_uart_task = _uart_task;
- apis->_uart_config = _uart_config;
- apis->_uart_status = _uart_status;
- apis->_uart_hwinit = _uart_hwinit;
-
- uart_ctl_blk._uart = apis;
- uart_ctl_blk.debug_mode = TRUE;
- return;
-}
-
-#endif /* SYSTEM_MODULE_UART */
-
projects / open-ath9k-htc-firmware.git / blobdiff