108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
/*
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* \brief Driver for OMAP4 UARTs
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* \author Ivan Loskutov <ivan.loskutov@ksyslabs.org>
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* \date 2012-11-08
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*/
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/*
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* Copyright (C) 2012 Ksys Labs LLC
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* Copyright (C) 2011-2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _OMAP_UART_H_
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#define _OMAP_UART_H_
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/* Genode includes */
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#include <base/env.h>
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#include <base/printf.h>
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#include <os/irq_activation.h>
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#include <os/attached_io_mem_dataspace.h>
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#include <drivers/uart/tl16c750_base.h>
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/* local includes */
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#include "uart_driver.h"
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class Omap_uart : public Genode::Tl16c750_base, public Uart::Driver, public Genode::Irq_handler
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{
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private:
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Genode::Attached_io_mem_dataspace _uart_mmio;
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Uart::Char_avail_callback &_char_avail_callback;
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enum { IRQ_STACK_SIZE = 4096 };
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Genode::Irq_activation _irq_activation;
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void _enable_rx_interrupt()
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{
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/* enable access to 'Uart_fcr' and 'Uart_ier' */
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write<Uart_lcr::Reg_mode>(Uart_lcr::Reg_mode::OPERATIONAL);
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/* enable rx interrupt, disable other interrupts and sleep mode */
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write<Uart_ier>(Uart_ier::Rhr_it::bits(1)
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| Uart_ier::Thr_it::bits(0)
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| Uart_ier::Line_sts_it::bits(0)
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| Uart_ier::Modem_sts_it::bits(0)
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| Uart_ier::Sleep_mode::bits(0)
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| Uart_ier::Xoff_it::bits(0)
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| Uart_ier::Rts_it::bits(0)
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| Uart_ier::Cts_it::bits(0));
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/*
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* Configure protocol formatting and thereby return to
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* operational mode.
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*/
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write<Uart_lcr>(Uart_lcr::Char_length::bits(Uart_lcr::Char_length::_8_BIT)
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| Uart_lcr::Nb_stop::bits(Uart_lcr::Nb_stop::_1_STOP_BIT)
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| Uart_lcr::Parity_en::bits(0)
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| Uart_lcr::Break_en::bits(0)
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| Uart_lcr::Div_en::bits(0));
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}
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public:
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/**
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* Constructor
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*/
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Omap_uart(Genode::Attached_io_mem_dataspace *uart_mmio, int irq_number,
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unsigned baud_rate, Uart::Char_avail_callback &callback)
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:
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Tl16c750_base((Genode::addr_t)uart_mmio->local_addr<void>(), Genode::Board::TL16C750_CLOCK, baud_rate),
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_uart_mmio(*uart_mmio),
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_char_avail_callback(callback),
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_irq_activation(irq_number, *this, IRQ_STACK_SIZE)
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{
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_enable_rx_interrupt();
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}
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/**
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* * IRQ handler interface **
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*/
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void handle_irq(int irq_number)
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{
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/* inform client about the availability of data */
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unsigned int iir = read<Uart_iir::It_pending>();
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if (iir) return;
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_char_avail_callback();
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}
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/**
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* * UART driver interface **
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*/
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void put_char(char c) { Tl16c750_base::put_char(c); }
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bool char_avail() { return read<Uart_lsr::Rx_fifo_empty>(); }
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char get_char() { return read<Uart_rhr::Rhr>(); }
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void baud_rate(int bits_per_second)
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{
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_init(Genode::Board::TL16C750_CLOCK, bits_per_second);
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_enable_rx_interrupt();
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}
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};
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#endif /* _OMAP_UART_H_ */
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