target/linux/ubicom32/files/arch/ubicom32/include/asm/uart_tio.h

   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 */