| 1 | /* |
| 2 | * arch/ubicom32/include/asm/uart_tio.h |
| 3 | * Ubicom32 architecture UART TIO definitions. |
| 4 | * |
| 5 | * (C) Copyright 2009, Ubicom, Inc. |
| 6 | * |
| 7 | * This file is part of the Ubicom32 Linux Kernel Port. |
| 8 | * |
| 9 | * The Ubicom32 Linux Kernel Port is free software: you can redistribute |
| 10 | * it and/or modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation, either version 2 of the |
| 12 | * License, or (at your option) any later version. |
| 13 | * |
| 14 | * The Ubicom32 Linux Kernel Port is distributed in the hope that it |
| 15 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 16 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 17 | * the GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with the Ubicom32 Linux Kernel Port. If not, |
| 21 | * see <http://www.gnu.org/licenses/>. |
| 22 | */ |
| 23 | #ifndef _ASM_UBICOM32_UART_TIO_H |
| 24 | #define _ASM_UBICOM32_UART_TIO_H |
| 25 | |
| 26 | #include <asm/devtree.h> |
| 27 | |
| 28 | #define UARTTIO_RX_FIFO_SIZE 16 |
| 29 | #define UARTTIO_TX_FIFO_SIZE 16 |
| 30 | |
| 31 | /* |
| 32 | * Interrupt flags |
| 33 | */ |
| 34 | #define UARTTIO_UART_INT_RX 0x00000001 // set when a character has been recevied (TODO: add watermark) |
| 35 | #define UARTTIO_UART_INT_RXOVF 0x00000002 // set when the receive buffer has overflowed |
| 36 | #define UARTTIO_UART_INT_RXFRAME 0x00000004 // set when there has been a framing error |
| 37 | |
| 38 | #define UARTTIO_UART_INT_TX 0x00000100 // set every time a character is transmitted |
| 39 | #define UARTTIO_UART_INT_TXBE 0x00000200 // set when the transmit buffer is empty (TODO: add watermark) |
| 40 | |
| 41 | #define UARTTIO_UART_FLAG_ENABLED 0x80000000 |
| 42 | #define UARTTIO_UART_FLAG_SET_RATE 0x00000001 // set to update baud rate |
| 43 | #define UARTTIO_UART_FLAG_RESET 0x00000002 // set to reset the port |
| 44 | struct uarttio_uart { |
| 45 | volatile u32_t flags; |
| 46 | |
| 47 | volatile u32_t baud_rate; |
| 48 | volatile u32_t current_baud_rate; |
| 49 | u32_t bit_time; |
| 50 | |
| 51 | /* |
| 52 | * Modem status register |
| 53 | */ |
| 54 | volatile u32_t status; |
| 55 | |
| 56 | /* |
| 57 | * Interrupt registers |
| 58 | */ |
| 59 | volatile u32_t int_mask; |
| 60 | volatile u32_t int_flags; |
| 61 | |
| 62 | /* |
| 63 | * Ports and pins |
| 64 | */ |
| 65 | u32_t rx_port; |
| 66 | u32_t tx_port; |
| 67 | |
| 68 | u8_t rx_pin; |
| 69 | u8_t tx_pin; |
| 70 | |
| 71 | /* |
| 72 | * Configuration Data |
| 73 | */ |
| 74 | u8_t rx_bits; |
| 75 | u8_t rx_stop_bits; |
| 76 | u8_t tx_bits; |
| 77 | u8_t tx_stop_bits; |
| 78 | |
| 79 | /* |
| 80 | * RX state machine data |
| 81 | */ |
| 82 | u32_t rx_timer; |
| 83 | u32_t rx_bit_pos; |
| 84 | u32_t rx_byte; |
| 85 | u32_t rx_fifo_head; |
| 86 | u32_t rx_fifo_tail; |
| 87 | u32_t rx_fifo_size; |
| 88 | |
| 89 | /* |
| 90 | * TX state machine data |
| 91 | */ |
| 92 | u32_t tx_timer; |
| 93 | u32_t tx_bit_pos; |
| 94 | u32_t tx_byte; |
| 95 | u32_t tx_fifo_head; |
| 96 | u32_t tx_fifo_tail; |
| 97 | u32_t tx_fifo_size; |
| 98 | |
| 99 | /* |
| 100 | * FIFOs |
| 101 | */ |
| 102 | u8_t rx_fifo[UARTTIO_RX_FIFO_SIZE]; |
| 103 | u8_t tx_fifo[UARTTIO_TX_FIFO_SIZE]; |
| 104 | }; |
| 105 | |
| 106 | #define UARTTIO_VP_VERSION 1 |
| 107 | struct uarttio_regs { |
| 108 | u32_t version; |
| 109 | |
| 110 | u32_t thread; |
| 111 | |
| 112 | u32_t max_uarts; |
| 113 | |
| 114 | struct uarttio_uart uarts[0]; |
| 115 | }; |
| 116 | |
| 117 | #define UARTTIO_NODE_VERSION 1 |
| 118 | struct uarttio_node { |
| 119 | struct devtree_node dn; |
| 120 | |
| 121 | u32_t version; |
| 122 | struct uarttio_regs *regs; |
| 123 | u32_t regs_sz; |
| 124 | }; |
| 125 | |
| 126 | #endif /* _ASM_UBICOM32_UART_TIO_H */ |
| 127 | |
