+++ /dev/null
-/**
- * \file
- * <!--
- * This file is part of BeRTOS.
- *
- * Bertos is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * As a special exception, you may use this file as part of a free software
- * library without restriction. Specifically, if other files instantiate
- * templates or use macros or inline functions from this file, or you compile
- * this file and link it with other files to produce an executable, this
- * file does not by itself cause the resulting executable to be covered by
- * the GNU General Public License. This exception does not however
- * invalidate any other reasons why the executable file might be covered by
- * the GNU General Public License.
- *
- * Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
- * Copyright 2000 Bernardo Innocenti <bernie@codewiz.org>
- *
- * -->
- *
- * \brief ARM UART and SPI I/O driver
- *
- *
- * \version $Id: ser_amr.c 18280 2007-10-11 15:14:20Z asterix $
- * \author Daniele Basile <asterix@develer.com>
- */
-
-#include <io/arm.h>
-
-//#include "ser_at91.h"
-#include <drv/ser.h>
-#include <drv/ser_p.h>
-
-#include <hw/hw_ser.h> /* Required for bus macros overrides */
-#include <hw/hw_cpu.h> /* CLOCK_FREQ */
-
-#include <mware/fifobuf.h>
-#include <cfg/debug.h>
-
-#include <appconfig.h>
-
-
-/**
- * \name Overridable serial bus hooks
- *
- * These can be redefined in hw.h to implement
- * special bus policies such as half-duplex, 485, etc.
- *
- *
- * \code
- * TXBEGIN TXCHAR TXEND TXOFF
- * | __________|__________ | |
- * | | | | | | | | |
- * v v v v v v v v v
- * ______ __ __ __ __ __ __ ________________
- * \/ \/ \/ \/ \/ \/ \/
- * ______/\__/\__/\__/\__/\__/\__/
- *
- * \endcode
- *
- * \{
- */
-
-#ifndef SER_UART0_IRQ_INIT
- /**
- * Default IRQ INIT macro - invoked in uart0_init()
- *
- * - Disable all interrupt
- * - Register USART0 interrupt
- * - Enable USART0 clock.
- */
- #define SER_UART0_IRQ_INIT do { \
- US0_IDR = 0xFFFFFFFF; \
- /* Set the vector. */ \
- AIC_SVR(US0_ID) = uart0_irq_dispatcher; \
- /* Initialize to edge triggered with defined priority. */ \
- AIC_SMR(US0_ID) = AIC_SRCTYPE_INT_EDGE_TRIGGERED; \
- /* Enable the USART IRQ */ \
- AIC_IECR = BV(US0_ID); \
- PMC_PCER = BV(US0_ID); \
- } while (0)
-#endif
-
-#ifndef SER_UART0_BUS_TXINIT
- /**
- * Default TXINIT macro - invoked in uart0_init()
- *
- * - Disable GPIO on USART0 tx/rx pins
- * - Reset USART0
- * - Set serial param: mode Normal, 8bit data, 1bit stop
- * - Enable both the receiver and the transmitter
- * - Enable only the RX complete interrupt
- */
- #if CPU_ARM_AT91
- #define SER_UART0_BUS_TXINIT do { \
- PIOA_PDR = BV(5) | BV(6);\
- US0_CR = BV(US_RSTRX) | BV(US_RSTTX); \
- US0_MR = US_CHMODE_NORMAL | US_CHRL_8 | US_NBSTOP_1; \
- US0_CR = BV(US_RXEN) | BV(US_TXEN); \
- US0_IER = BV(US_RXRDY); \
- } while (0)
- /*#elif Add other ARM families here */
- #else
- #error Unknown CPU
- #endif
-
-#endif
-
-#ifndef SER_UART0_BUS_TXBEGIN
- /**
- * Invoked before starting a transmission
- *
- * - Enable both the receiver and the transmitter
- * - Enable both the RX complete and TX empty interrupts
- */
- #define SER_UART0_BUS_TXBEGIN do { \
- US0_CR = BV(US_RXEN) | BV(US_TXEN); \
- US0_IER = BV(US_TXRDY) | BV(US_RXRDY); \
- } while (0)
-#endif
-
-#ifndef SER_UART0_BUS_TXCHAR
- /**
- * Invoked to send one character.
- */
- #define SER_UART0_BUS_TXCHAR(c) do { \
- US0_THR = c; \
- } while (0)
-#endif
-
-#ifndef SER_UART0_BUS_TXEND
- /**
- * Invoked as soon as the txfifo becomes empty
- *
- * - Keep both the receiver and the transmitter enabled
- * - Keep the RX complete interrupt enabled
- * - Disable the TX empty interrupts
- */
- #define SER_UART0_BUS_TXEND do { \
- US0_CR = BV(US_RXEN) | BV(US_TXEN); \
- US0_IER = BV(US_RXRDY); \
- US0_IDR = BV(US_TXRDY); \
- } while (0)
-#endif
-
-/**
- * \def CONFIG_SER_STROBE
- *
- * This is a debug facility that can be used to
- * monitor SER interrupt activity on an external pin.
- *
- * To use strobes, redefine the macros SER_STROBE_ON,
- * SER_STROBE_OFF and SER_STROBE_INIT and set
- * CONFIG_SER_STROBE to 1.
- */
-#if !defined(CONFIG_SER_STROBE) || !CONFIG_SER_STROBE
- #define SER_STROBE_ON do {/*nop*/} while(0)
- #define SER_STROBE_OFF do {/*nop*/} while(0)
- #define SER_STROBE_INIT do {/*nop*/} while(0)
-#endif
-
-
-/* From the high-level serial driver */
-extern struct Serial ser_handles[SER_CNT];
-
-/* TX and RX buffers */
-static unsigned char uart0_txbuffer[CONFIG_UART0_TXBUFSIZE];
-static unsigned char uart0_rxbuffer[CONFIG_UART0_RXBUFSIZE];
-
-/**
- * Internal hardware state structure
- *
- * The \a sending variable is true while the transmission
- * interrupt is retriggering itself.
- *
- * For the USARTs the \a sending flag is useful for taking specific
- * actions before sending a burst of data, at the start of a trasmission
- * but not before every char sent.
- *
- * For the SPI, this flag is necessary because the SPI sends and receives
- * bytes at the same time and the SPI IRQ is unique for send/receive.
- * The only way to start transmission is to write data in SPDR (this
- * is done by spi_starttx()). We do this *only* if a transfer is
- * not already started.
- */
-struct ArmSerial
-{
- struct SerialHardware hw;
- volatile bool sending;
-};
-
-
-/*
- * These are to trick GCC into *not* using absolute addressing mode
- * when accessing ser_handles, which is very expensive.
- *
- * Accessing through these pointers generates much shorter
- * (and hopefully faster) code.
- */
-struct Serial *ser_uart0 = &ser_handles[SER_UART0];
-
-/**
- * Serial 0 TX interrupt handler
- */
-static void serirq_tx(void)
-{
- SER_STROBE_ON;
-
- struct FIFOBuffer * const txfifo = &ser_uart0->txfifo;
-
- if (fifo_isempty(txfifo))
- {
- SER_UART0_BUS_TXEND;
- }
- else
- {
- char c = fifo_pop(txfifo);
-// kprintf("Tx char: %c\n", c);
- SER_UART0_BUS_TXCHAR(c);
- }
-
- SER_STROBE_OFF;
-}
-
-/**
- * Serial 0 RX complete interrupt handler.
- */
-static void serirq_rx(void)
-{
- SER_STROBE_ON;
-
- /* Should be read before US_CRS */
- ser_uart0->status |= US0_CSR & (SERRF_RXSROVERRUN | SERRF_FRAMEERROR);
-
- char c = US0_RHR;
- struct FIFOBuffer * const rxfifo = &ser_uart0->rxfifo;
-
- if (fifo_isfull(rxfifo))
- ser_uart0->status |= SERRF_RXFIFOOVERRUN;
- else
- {
-// kprintf("Recv char: %c\n", c);
- fifo_push(rxfifo, c);
- }
-
- SER_STROBE_OFF;
-}
-
-/**
- * Serial IRQ dispatcher.
- */
-static void uart0_irq_dispatcher(void) __attribute__ ((naked));
-static void uart0_irq_dispatcher(void)
-{
- IRQ_ENTRY();
-
- if (US0_IMR & BV(US_RXRDY))
- {
-// kprintf("IRQ RX\n");
- serirq_rx();
- }
- if (US0_IMR & BV(US_TXRDY))
- {
-// kprintf("IRQ TX\n");
- serirq_tx();
- }
- IRQ_EXIT();
-}
-
-/*
- * Callbacks
- */
-static void uart0_init(
- UNUSED_ARG(struct SerialHardware *, _hw),
- UNUSED_ARG(struct Serial *, ser))
-{
- SER_UART0_IRQ_INIT;
- SER_UART0_BUS_TXINIT;
- SER_STROBE_INIT;
-}
-
-static void uart0_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
-{
- US0_CR = BV(US_RSTRX) | BV(US_RSTTX) | BV(US_RXDIS) | BV(US_TXDIS) | BV(US_RSTSTA);
-}
-
-static void uart0_enabletxirq(struct SerialHardware *_hw)
-{
- struct ArmSerial *hw = (struct ArmSerial *)_hw;
-
- /*
- * WARNING: racy code here! The tx interrupt sets hw->sending to false
- * when it runs with an empty fifo. The order of statements in the
- * if-block matters.
- */
- if (!hw->sending)
- {
- hw->sending = true;
- SER_UART0_BUS_TXBEGIN;
- }
-}
-
-static void uart0_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate)
-{
- /* Compute baud-rate period */
- US0_BRGR = CLOCK_FREQ / (16 * rate);
- //DB(kprintf("uart0_setbaudrate(rate=%lu): period=%d\n", rate, period);)
-}
-
-static void uart0_setparity(UNUSED_ARG(struct SerialHardware *, _hw), int parity)
-{
- /* Set UART parity */
- switch(parity)
- {
- case SER_PARITY_NONE:
- {
- /* Parity mode. */
- US0_MR |= US_PAR_MASK;
- break;
- }
- case SER_PARITY_EVEN:
- {
- /* Even parity.*/
- US0_MR |= US_PAR_EVEN;
- break;
- }
- case SER_PARITY_ODD:
- {
- /* Odd parity.*/
- US0_MR |= US_PAR_ODD;
- break;
- }
- }
-
-}
-
-static bool tx_sending(struct SerialHardware* _hw)
-{
- struct ArmSerial *hw = (struct ArmSerial *)_hw;
- return hw->sending;
-}
-
-// FIXME: move into compiler.h? Ditch?
-#if COMPILER_C99
- #define C99INIT(name,val) .name = val
-#elif defined(__GNUC__)
- #define C99INIT(name,val) name: val
-#else
- #warning No designated initializers, double check your code
- #define C99INIT(name,val) (val)
-#endif
-
-/*
- * High-level interface data structures
- */
-static const struct SerialHardwareVT UART0_VT =
-{
- C99INIT(init, uart0_init),
- C99INIT(cleanup, uart0_cleanup),
- C99INIT(setBaudrate, uart0_setbaudrate),
- C99INIT(setParity, uart0_setparity),
- C99INIT(txStart, uart0_enabletxirq),
- C99INIT(txSending, tx_sending),
-};
-
-static struct ArmSerial UARTDescs[SER_CNT] =
-{
- {
- C99INIT(hw, /**/) {
- C99INIT(table, &UART0_VT),
- C99INIT(txbuffer, uart0_txbuffer),
- C99INIT(rxbuffer, uart0_rxbuffer),
- C99INIT(txbuffer_size, sizeof(uart0_txbuffer)),
- C99INIT(rxbuffer_size, sizeof(uart0_rxbuffer)),
- },
- C99INIT(sending, false),
- }
-};
-
-struct SerialHardware *ser_hw_getdesc(int unit)
-{
- ASSERT(unit < SER_CNT);
- return &UARTDescs[unit].hw;
-}
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