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/*
* arch/ubicom32/include/asm/uart_tio.h
* Ubicom32 architecture UART TIO definitions.
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port 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.
*
* The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*/
#ifndef _ASM_UBICOM32_UART_TIO_H
#define _ASM_UBICOM32_UART_TIO_H
#include <asm/devtree.h>
#define UARTTIO_RX_FIFO_SIZE 16
#define UARTTIO_TX_FIFO_SIZE 16
/*
* Interrupt flags
*/
#define UARTTIO_UART_INT_RX 0x00000001 // set when a character has been recevied (TODO: add watermark)
#define UARTTIO_UART_INT_RXOVF 0x00000002 // set when the receive buffer has overflowed
#define UARTTIO_UART_INT_RXFRAME 0x00000004 // set when there has been a framing error
#define UARTTIO_UART_INT_TX 0x00000100 // set every time a character is transmitted
#define UARTTIO_UART_INT_TXBE 0x00000200 // set when the transmit buffer is empty (TODO: add watermark)
#define UARTTIO_UART_FLAG_ENABLED 0x80000000
#define UARTTIO_UART_FLAG_SET_RATE 0x00000001 // set to update baud rate
#define UARTTIO_UART_FLAG_RESET 0x00000002 // set to reset the port
struct uarttio_uart {
volatile u32_t flags;
volatile u32_t baud_rate;
volatile u32_t current_baud_rate;
u32_t bit_time;
/*
* Modem status register
*/
volatile u32_t status;
/*
* Interrupt registers
*/
volatile u32_t int_mask;
volatile u32_t int_flags;
/*
* Ports and pins
*/
u32_t rx_port;
u32_t tx_port;
u8_t rx_pin;
u8_t tx_pin;
/*
* Configuration Data
*/
u8_t rx_bits;
u8_t rx_stop_bits;
u8_t tx_bits;
u8_t tx_stop_bits;
/*
* RX state machine data
*/
u32_t rx_timer;
u32_t rx_bit_pos;
u32_t rx_byte;
u32_t rx_fifo_head;
u32_t rx_fifo_tail;
u32_t rx_fifo_size;
/*
* TX state machine data
*/
u32_t tx_timer;
u32_t tx_bit_pos;
u32_t tx_byte;
u32_t tx_fifo_head;
u32_t tx_fifo_tail;
u32_t tx_fifo_size;
/*
* FIFOs
*/
u8_t rx_fifo[UARTTIO_RX_FIFO_SIZE];
u8_t tx_fifo[UARTTIO_TX_FIFO_SIZE];
};
#define UARTTIO_VP_VERSION 1
struct uarttio_regs {
u32_t version;
u32_t thread;
u32_t max_uarts;
struct uarttio_uart uarts[0];
};
#define UARTTIO_NODE_VERSION 1
struct uarttio_node {
struct devtree_node dn;
u32_t version;
struct uarttio_regs *regs;
u32_t regs_sz;
};
#endif /* _ASM_UBICOM32_UART_TIO_H */
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