[0737710] | 1 | /* |
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[aa0da6b] | 2 | * This file contains the TTY driver for the National Semiconductor NS16550. |
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| 3 | * |
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| 4 | * This part is widely cloned and second sourced. It is found in a number |
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| 5 | * of "Super IO" controllers. |
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[0737710] | 6 | * |
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| 7 | * COPYRIGHT (c) 1998 by Radstone Technology |
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| 8 | * |
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| 9 | * |
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| 10 | * THIS FILE IS PROVIDED TO YOU, THE USER, "AS IS", WITHOUT WARRANTY OF ANY |
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| 11 | * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE |
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| 12 | * IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK |
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| 13 | * AS TO THE QUALITY AND PERFORMANCE OF ALL CODE IN THIS FILE IS WITH YOU. |
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| 14 | * |
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| 15 | * You are hereby granted permission to use, copy, modify, and distribute |
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| 16 | * this file, provided that this notice, plus the above copyright notice |
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| 17 | * and disclaimer, appears in all copies. Radstone Technology will provide |
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| 18 | * no support for this code. |
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| 19 | * |
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| 20 | * This driver uses the termios pseudo driver. |
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| 21 | */ |
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| 22 | |
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| 23 | #include <rtems.h> |
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| 24 | #include <rtems/libio.h> |
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| 25 | #include <stdlib.h> |
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[ee3b242b] | 26 | #include <ringbuf.h> |
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[0737710] | 27 | |
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[ee3b242b] | 28 | #include <libchip/serial.h> |
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[0737710] | 29 | #include "ns16550_p.h" |
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| 30 | |
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| 31 | /* |
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| 32 | * Flow control is only supported when using interrupts |
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| 33 | */ |
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| 34 | console_flow ns16550_flow_RTSCTS = |
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| 35 | { |
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| 36 | ns16550_negate_RTS, /* deviceStopRemoteTx */ |
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| 37 | ns16550_assert_RTS /* deviceStartRemoteTx */ |
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| 38 | }; |
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| 39 | |
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| 40 | console_flow ns16550_flow_DTRCTS = |
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| 41 | { |
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| 42 | ns16550_negate_DTR, /* deviceStopRemoteTx */ |
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| 43 | ns16550_assert_DTR /* deviceStartRemoteTx */ |
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| 44 | }; |
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| 45 | |
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| 46 | console_fns ns16550_fns = |
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| 47 | { |
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| 48 | ns16550_probe, /* deviceProbe */ |
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| 49 | ns16550_open, /* deviceFirstOpen */ |
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| 50 | ns16550_flush, /* deviceLastClose */ |
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| 51 | NULL, /* deviceRead */ |
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| 52 | ns16550_write_support_int, /* deviceWrite */ |
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| 53 | ns16550_initialize_interrupts, /* deviceInitialize */ |
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| 54 | ns16550_write_polled, /* deviceWritePolled */ |
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| 55 | FALSE, /* deviceOutputUsesInterrupts */ |
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| 56 | }; |
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| 57 | |
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| 58 | console_fns ns16550_fns_polled = |
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| 59 | { |
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| 60 | ns16550_probe, /* deviceProbe */ |
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| 61 | ns16550_open, /* deviceFirstOpen */ |
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| 62 | ns16550_close, /* deviceLastClose */ |
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| 63 | ns16550_inbyte_nonblocking_polled, /* deviceRead */ |
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| 64 | ns16550_write_support_polled, /* deviceWrite */ |
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| 65 | ns16550_init, /* deviceInitialize */ |
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| 66 | ns16550_write_polled, /* deviceWritePolled */ |
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| 67 | FALSE, /* deviceOutputUsesInterrupts */ |
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| 68 | }; |
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| 69 | |
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| 70 | extern void set_vector( rtems_isr_entry, rtems_vector_number, int ); |
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| 71 | |
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| 72 | /* |
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| 73 | * Console Device Driver Entry Points |
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| 74 | */ |
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| 75 | static boolean ns16550_probe(int minor) |
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| 76 | { |
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| 77 | /* |
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[4cd4c5a] | 78 | * If the configuration dependent probe has located the device then |
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[0737710] | 79 | * assume it is there |
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| 80 | */ |
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| 81 | return(TRUE); |
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| 82 | } |
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| 83 | |
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| 84 | static void ns16550_init(int minor) |
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| 85 | { |
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| 86 | unsigned32 pNS16550; |
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| 87 | unsigned8 ucTrash; |
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| 88 | unsigned8 ucDataByte; |
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| 89 | unsigned32 ulBaudDivisor; |
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| 90 | ns16550_context *pns16550Context; |
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| 91 | setRegister_f setReg; |
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| 92 | getRegister_f getReg; |
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| 93 | |
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| 94 | pns16550Context=(ns16550_context *)malloc(sizeof(ns16550_context)); |
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| 95 | |
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| 96 | Console_Port_Data[minor].pDeviceContext=(void *)pns16550Context; |
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| 97 | pns16550Context->ucModemCtrl=SP_MODEM_IRQ; |
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| 98 | |
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| 99 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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| 100 | setReg = Console_Port_Tbl[minor].setRegister; |
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| 101 | getReg = Console_Port_Tbl[minor].getRegister; |
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| 102 | |
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| 103 | /* Clear the divisor latch, clear all interrupt enables, |
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| 104 | * and reset and |
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| 105 | * disable the FIFO's. |
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| 106 | */ |
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| 107 | |
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| 108 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, 0x0); |
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| 109 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, 0x0); |
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| 110 | |
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| 111 | /* Set the divisor latch and set the baud rate. */ |
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| 112 | |
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| 113 | ulBaudDivisor=NS16550_Baud((unsigned32)Console_Port_Tbl[minor].pDeviceParams); |
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| 114 | ucDataByte = SP_LINE_DLAB; |
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| 115 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucDataByte); |
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| 116 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, ulBaudDivisor&0xff); |
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| 117 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, (ulBaudDivisor>>8)&0xff); |
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| 118 | |
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| 119 | /* Clear the divisor latch and set the character size to eight bits */ |
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| 120 | /* with one stop bit and no parity checking. */ |
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| 121 | ucDataByte = EIGHT_BITS; |
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| 122 | (*setReg)(pNS16550, NS16550_LINE_CONTROL, ucDataByte); |
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| 123 | |
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| 124 | /* Enable and reset transmit and receive FIFOs. TJA */ |
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| 125 | ucDataByte = SP_FIFO_ENABLE; |
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| 126 | (*setReg)(pNS16550, NS16550_FIFO_CONTROL, ucDataByte); |
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| 127 | |
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| 128 | ucDataByte = SP_FIFO_ENABLE | SP_FIFO_RXRST | SP_FIFO_TXRST; |
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| 129 | (*setReg)(pNS16550, NS16550_FIFO_CONTROL, ucDataByte); |
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| 130 | |
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| 131 | /* |
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| 132 | * Disable interrupts |
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| 133 | */ |
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| 134 | ucDataByte = 0; |
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| 135 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, ucDataByte); |
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| 136 | |
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| 137 | /* Set data terminal ready. */ |
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| 138 | /* And open interrupt tristate line */ |
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| 139 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL,pns16550Context->ucModemCtrl); |
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| 140 | |
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| 141 | ucTrash = (*getReg)(pNS16550, NS16550_LINE_STATUS ); |
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| 142 | ucTrash = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER ); |
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| 143 | } |
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| 144 | |
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| 145 | static int ns16550_open( |
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| 146 | int major, |
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| 147 | int minor, |
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| 148 | void * arg |
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| 149 | ) |
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| 150 | { |
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| 151 | /* |
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| 152 | * Assert DTR |
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| 153 | */ |
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| 154 | |
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| 155 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_DTRCTS) { |
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| 156 | ns16550_assert_DTR(minor); |
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| 157 | } |
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| 158 | |
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| 159 | return(RTEMS_SUCCESSFUL); |
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| 160 | } |
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| 161 | |
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| 162 | static int ns16550_close( |
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| 163 | int major, |
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| 164 | int minor, |
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| 165 | void * arg |
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| 166 | ) |
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| 167 | { |
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| 168 | /* |
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| 169 | * Negate DTR |
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| 170 | */ |
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| 171 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_DTRCTS) { |
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| 172 | ns16550_negate_DTR(minor); |
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| 173 | } |
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| 174 | |
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| 175 | return(RTEMS_SUCCESSFUL); |
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| 176 | } |
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| 177 | |
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| 178 | /* |
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| 179 | * ns16550_write_polled |
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| 180 | */ |
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| 181 | static void ns16550_write_polled( |
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| 182 | int minor, |
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| 183 | char cChar |
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| 184 | ) |
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| 185 | { |
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| 186 | unsigned32 pNS16550; |
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| 187 | unsigned char ucLineStatus; |
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| 188 | int iTimeout; |
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| 189 | getRegister_f getReg; |
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| 190 | setRegister_f setReg; |
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| 191 | |
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| 192 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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| 193 | getReg = Console_Port_Tbl[minor].getRegister; |
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| 194 | setReg = Console_Port_Tbl[minor].setRegister; |
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| 195 | |
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| 196 | /* |
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| 197 | * wait for transmitter holding register to be empty |
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| 198 | */ |
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| 199 | iTimeout=1000; |
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| 200 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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| 201 | while ((ucLineStatus & SP_LSR_THOLD) == 0) { |
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| 202 | /* |
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| 203 | * Yield while we wait |
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| 204 | */ |
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| 205 | if(_System_state_Is_up(_System_state_Get())) { |
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| 206 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
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| 207 | } |
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| 208 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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| 209 | if(!--iTimeout) { |
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| 210 | break; |
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| 211 | } |
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| 212 | } |
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| 213 | |
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| 214 | /* |
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| 215 | * transmit character |
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| 216 | */ |
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| 217 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, cChar); |
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| 218 | } |
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| 219 | |
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| 220 | /* |
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| 221 | * These routines provide control of the RTS and DTR lines |
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| 222 | */ |
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| 223 | /* |
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| 224 | * ns16550_assert_RTS |
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| 225 | */ |
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| 226 | static int ns16550_assert_RTS(int minor) |
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| 227 | { |
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| 228 | unsigned32 pNS16550; |
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| 229 | unsigned32 Irql; |
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| 230 | ns16550_context *pns16550Context; |
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| 231 | setRegister_f setReg; |
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| 232 | |
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| 233 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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| 234 | |
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| 235 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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| 236 | setReg = Console_Port_Tbl[minor].setRegister; |
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| 237 | |
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| 238 | /* |
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| 239 | * Assert RTS |
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| 240 | */ |
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| 241 | rtems_interrupt_disable(Irql); |
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| 242 | pns16550Context->ucModemCtrl|=SP_MODEM_RTS; |
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| 243 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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| 244 | rtems_interrupt_enable(Irql); |
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| 245 | return 0; |
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| 246 | } |
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| 247 | |
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| 248 | /* |
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| 249 | * ns16550_negate_RTS |
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| 250 | */ |
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| 251 | static int ns16550_negate_RTS(int minor) |
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| 252 | { |
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| 253 | unsigned32 pNS16550; |
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| 254 | unsigned32 Irql; |
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| 255 | ns16550_context *pns16550Context; |
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| 256 | setRegister_f setReg; |
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| 257 | |
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| 258 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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| 259 | |
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| 260 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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| 261 | setReg = Console_Port_Tbl[minor].setRegister; |
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| 262 | |
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| 263 | /* |
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| 264 | * Negate RTS |
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| 265 | */ |
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| 266 | rtems_interrupt_disable(Irql); |
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| 267 | pns16550Context->ucModemCtrl&=~SP_MODEM_RTS; |
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| 268 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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| 269 | rtems_interrupt_enable(Irql); |
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| 270 | return 0; |
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| 271 | } |
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| 272 | |
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| 273 | /* |
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| 274 | * These flow control routines utilise a connection from the local DTR |
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| 275 | * line to the remote CTS line |
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| 276 | */ |
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| 277 | /* |
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| 278 | * ns16550_assert_DTR |
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| 279 | */ |
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| 280 | static int ns16550_assert_DTR(int minor) |
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| 281 | { |
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| 282 | unsigned32 pNS16550; |
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| 283 | unsigned32 Irql; |
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| 284 | ns16550_context *pns16550Context; |
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| 285 | setRegister_f setReg; |
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| 286 | |
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| 287 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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| 288 | |
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| 289 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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| 290 | setReg = Console_Port_Tbl[minor].setRegister; |
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| 291 | |
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| 292 | /* |
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| 293 | * Assert DTR |
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| 294 | */ |
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| 295 | rtems_interrupt_disable(Irql); |
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| 296 | pns16550Context->ucModemCtrl|=SP_MODEM_DTR; |
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| 297 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL, pns16550Context->ucModemCtrl); |
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| 298 | rtems_interrupt_enable(Irql); |
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| 299 | return 0; |
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| 300 | } |
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| 301 | |
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| 302 | /* |
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| 303 | * ns16550_negate_DTR |
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| 304 | */ |
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| 305 | static int ns16550_negate_DTR(int minor) |
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| 306 | { |
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| 307 | unsigned32 pNS16550; |
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| 308 | unsigned32 Irql; |
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| 309 | ns16550_context *pns16550Context; |
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| 310 | setRegister_f setReg; |
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| 311 | |
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| 312 | pns16550Context=(ns16550_context *) Console_Port_Data[minor].pDeviceContext; |
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| 313 | |
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| 314 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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| 315 | setReg = Console_Port_Tbl[minor].setRegister; |
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| 316 | |
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| 317 | /* |
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| 318 | * Negate DTR |
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| 319 | */ |
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| 320 | rtems_interrupt_disable(Irql); |
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| 321 | pns16550Context->ucModemCtrl&=~SP_MODEM_DTR; |
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| 322 | (*setReg)(pNS16550, NS16550_MODEM_CONTROL,pns16550Context->ucModemCtrl); |
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| 323 | rtems_interrupt_enable(Irql); |
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| 324 | return 0; |
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| 325 | } |
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| 326 | |
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| 327 | /* |
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| 328 | * ns16550_isr |
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| 329 | * |
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| 330 | * This routine is the console interrupt handler for COM1 and COM2 |
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| 331 | * |
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| 332 | * Input parameters: |
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| 333 | * vector - vector number |
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| 334 | * |
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| 335 | * Output parameters: NONE |
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| 336 | * |
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| 337 | * Return values: NONE |
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| 338 | */ |
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| 339 | |
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| 340 | static void ns16550_process( |
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| 341 | int minor |
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| 342 | ) |
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| 343 | { |
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| 344 | unsigned32 pNS16550; |
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| 345 | volatile unsigned8 ucLineStatus; |
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| 346 | volatile unsigned8 ucInterruptId; |
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| 347 | char cChar; |
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| 348 | getRegister_f getReg; |
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| 349 | setRegister_f setReg; |
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| 350 | |
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| 351 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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| 352 | getReg = Console_Port_Tbl[minor].getRegister; |
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| 353 | setReg = Console_Port_Tbl[minor].setRegister; |
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| 354 | |
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| 355 | do { |
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| 356 | /* |
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| 357 | * Deal with any received characters |
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| 358 | */ |
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| 359 | while(TRUE) { |
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| 360 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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| 361 | if(~ucLineStatus & SP_LSR_RDY) { |
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| 362 | break; |
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| 363 | } |
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| 364 | cChar = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER); |
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| 365 | rtems_termios_enqueue_raw_characters( |
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| 366 | Console_Port_Data[minor].termios_data, |
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| 367 | &cChar, |
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| 368 | 1 |
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| 369 | ); |
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| 370 | } |
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| 371 | |
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| 372 | while(TRUE) { |
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| 373 | if(Ring_buffer_Is_empty(&Console_Port_Data[minor].TxBuffer)) { |
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| 374 | Console_Port_Data[minor].bActive=FALSE; |
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| 375 | if(Console_Port_Tbl[minor].pDeviceFlow !=&ns16550_flow_RTSCTS) { |
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| 376 | ns16550_negate_RTS(minor); |
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| 377 | } |
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| 378 | |
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| 379 | /* |
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| 380 | * There is no data to transmit |
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| 381 | */ |
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| 382 | break; |
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| 383 | } |
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| 384 | |
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| 385 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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| 386 | if(~ucLineStatus & SP_LSR_THOLD) { |
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| 387 | /* |
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| 388 | * We'll get another interrupt when |
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| 389 | * the transmitter holding reg. becomes |
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| 390 | * free again |
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| 391 | */ |
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| 392 | break; |
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| 393 | } |
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| 394 | |
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| 395 | Ring_buffer_Remove_character( &Console_Port_Data[minor].TxBuffer, cChar); |
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| 396 | /* |
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| 397 | * transmit character |
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| 398 | */ |
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| 399 | (*setReg)(pNS16550, NS16550_TRANSMIT_BUFFER, cChar); |
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| 400 | } |
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| 401 | |
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| 402 | ucInterruptId = (*getReg)(pNS16550, NS16550_INTERRUPT_ID); |
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| 403 | } |
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| 404 | while((ucInterruptId&0xf)!=0x1); |
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| 405 | } |
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| 406 | |
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| 407 | static rtems_isr ns16550_isr( |
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| 408 | rtems_vector_number vector |
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| 409 | ) |
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| 410 | { |
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| 411 | int minor; |
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| 412 | |
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| 413 | for(minor=0;minor<Console_Port_Count;minor++) { |
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| 414 | if(vector==Console_Port_Tbl[minor].ulIntVector) { |
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| 415 | ns16550_process(minor); |
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| 416 | } |
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| 417 | } |
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| 418 | } |
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| 419 | |
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| 420 | /* |
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| 421 | * ns16550_flush |
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| 422 | */ |
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| 423 | static int ns16550_flush(int major, int minor, void *arg) |
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| 424 | { |
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| 425 | while(!Ring_buffer_Is_empty(&Console_Port_Data[minor].TxBuffer)) { |
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| 426 | /* |
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| 427 | * Yield while we wait |
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| 428 | */ |
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| 429 | if(_System_state_Is_up(_System_state_Get())) { |
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| 430 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
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| 431 | } |
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| 432 | } |
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| 433 | |
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| 434 | ns16550_close(major, minor, arg); |
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| 435 | |
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| 436 | return(RTEMS_SUCCESSFUL); |
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| 437 | } |
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| 438 | |
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| 439 | /* |
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| 440 | * ns16550_initialize_interrupts |
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| 441 | * |
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| 442 | * This routine initializes the console's receive and transmit |
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| 443 | * ring buffers and loads the appropriate vectors to handle the interrupts. |
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| 444 | * |
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| 445 | * Input parameters: NONE |
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| 446 | * |
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| 447 | * Output parameters: NONE |
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| 448 | * |
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| 449 | * Return values: NONE |
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| 450 | */ |
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| 451 | |
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| 452 | static void ns16550_enable_interrupts( |
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| 453 | int minor |
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| 454 | ) |
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| 455 | { |
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| 456 | unsigned32 pNS16550; |
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| 457 | unsigned8 ucDataByte; |
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| 458 | setRegister_f setReg; |
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| 459 | |
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| 460 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
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| 461 | setReg = Console_Port_Tbl[minor].setRegister; |
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| 462 | |
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| 463 | /* |
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| 464 | * Enable interrupts |
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| 465 | */ |
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| 466 | ucDataByte = SP_INT_RX_ENABLE | SP_INT_TX_ENABLE; |
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| 467 | (*setReg)(pNS16550, NS16550_INTERRUPT_ENABLE, ucDataByte); |
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| 468 | |
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| 469 | } |
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| 470 | |
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| 471 | static void ns16550_initialize_interrupts(int minor) |
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| 472 | { |
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| 473 | ns16550_init(minor); |
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| 474 | |
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| 475 | Ring_buffer_Initialize(&Console_Port_Data[minor].TxBuffer); |
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| 476 | |
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| 477 | Console_Port_Data[minor].bActive = FALSE; |
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| 478 | |
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| 479 | set_vector(ns16550_isr, Console_Port_Tbl[minor].ulIntVector, 1); |
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| 480 | |
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| 481 | ns16550_enable_interrupts(minor); |
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| 482 | } |
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| 483 | |
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| 484 | /* |
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| 485 | * ns16550_write_support_int |
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| 486 | * |
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| 487 | * Console Termios output entry point. |
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| 488 | * |
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| 489 | */ |
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| 490 | static int ns16550_write_support_int( |
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| 491 | int minor, |
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| 492 | const char *buf, |
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| 493 | int len |
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| 494 | ) |
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| 495 | { |
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| 496 | int i; |
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| 497 | unsigned32 Irql; |
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| 498 | |
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| 499 | for(i=0; i<len;) { |
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| 500 | if(Ring_buffer_Is_full(&Console_Port_Data[minor].TxBuffer)) { |
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| 501 | if(!Console_Port_Data[minor].bActive) { |
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| 502 | /* |
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| 503 | * Wake up the device |
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| 504 | */ |
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| 505 | rtems_interrupt_disable(Irql); |
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| 506 | Console_Port_Data[minor].bActive = TRUE; |
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| 507 | if(Console_Port_Tbl[minor].pDeviceFlow != &ns16550_flow_RTSCTS) { |
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| 508 | ns16550_assert_RTS(minor); |
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| 509 | } |
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| 510 | ns16550_process(minor); |
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| 511 | rtems_interrupt_enable(Irql); |
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| 512 | } else { |
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| 513 | /* |
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| 514 | * Yield |
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| 515 | */ |
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| 516 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
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| 517 | } |
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| 518 | |
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| 519 | /* |
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| 520 | * Wait for ring buffer to empty |
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| 521 | */ |
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| 522 | continue; |
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| 523 | } |
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| 524 | else { |
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| 525 | Ring_buffer_Add_character( &Console_Port_Data[minor].TxBuffer, buf[i]); |
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| 526 | i++; |
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| 527 | } |
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| 528 | } |
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| 529 | |
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| 530 | /* |
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| 531 | * Ensure that characters are on the way |
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| 532 | */ |
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| 533 | if(!Console_Port_Data[minor].bActive) { |
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| 534 | /* |
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| 535 | * Wake up the device |
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| 536 | */ |
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| 537 | rtems_interrupt_disable(Irql); |
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| 538 | Console_Port_Data[minor].bActive = TRUE; |
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| 539 | if(Console_Port_Tbl[minor].pDeviceFlow !=&ns16550_flow_RTSCTS) { |
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| 540 | ns16550_assert_RTS(minor); |
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| 541 | } |
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| 542 | ns16550_process(minor); |
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| 543 | rtems_interrupt_enable(Irql); |
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| 544 | } |
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| 545 | |
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| 546 | return (len); |
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| 547 | } |
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| 548 | |
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| 549 | /* |
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| 550 | * ns16550_write_support_polled |
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| 551 | * |
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| 552 | * Console Termios output entry point. |
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| 553 | * |
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| 554 | */ |
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| 555 | static int ns16550_write_support_polled( |
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| 556 | int minor, |
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| 557 | const char *buf, |
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| 558 | int len |
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| 559 | ) |
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| 560 | { |
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| 561 | int nwrite = 0; |
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| 562 | |
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| 563 | /* |
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| 564 | * poll each byte in the string out of the port. |
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| 565 | */ |
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| 566 | while (nwrite < len) { |
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| 567 | /* |
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| 568 | * transmit character |
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| 569 | */ |
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| 570 | ns16550_write_polled(minor, *buf++); |
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| 571 | nwrite++; |
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| 572 | } |
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| 573 | |
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| 574 | /* |
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| 575 | * return the number of bytes written. |
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| 576 | */ |
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| 577 | return nwrite; |
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| 578 | } |
---|
| 579 | |
---|
| 580 | /* |
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| 581 | * ns16550_inbyte_nonblocking_polled |
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| 582 | * |
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| 583 | * Console Termios polling input entry point. |
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| 584 | */ |
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| 585 | |
---|
| 586 | static int ns16550_inbyte_nonblocking_polled( |
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| 587 | int minor |
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| 588 | ) |
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| 589 | { |
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| 590 | unsigned32 pNS16550; |
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| 591 | unsigned char ucLineStatus; |
---|
| 592 | char cChar; |
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| 593 | getRegister_f getReg; |
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| 594 | |
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| 595 | pNS16550 = Console_Port_Tbl[minor].ulCtrlPort1; |
---|
| 596 | getReg = Console_Port_Tbl[minor].getRegister; |
---|
| 597 | |
---|
| 598 | ucLineStatus = (*getReg)(pNS16550, NS16550_LINE_STATUS); |
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| 599 | if(ucLineStatus & SP_LSR_RDY) { |
---|
| 600 | cChar = (*getReg)(pNS16550, NS16550_RECEIVE_BUFFER); |
---|
| 601 | return((int)cChar); |
---|
| 602 | } else { |
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| 603 | return(-1); |
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| 604 | } |
---|
| 605 | } |
---|