diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/include/asm/uart_tio.h')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/include/asm/uart_tio.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/include/asm/uart_tio.h b/target/linux/ubicom32/files/arch/ubicom32/include/asm/uart_tio.h new file mode 100644 index 000000000..19ef82efa --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/include/asm/uart_tio.h @@ -0,0 +1,126 @@ +/* + * 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 */ |