1/* 2 * Copyright (c) 2008 Travis Geiselbrecht 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining 5 * a copy of this software and associated documentation files 6 * (the "Software"), to deal in the Software without restriction, 7 * including without limitation the rights to use, copy, modify, merge, 8 * publish, distribute, sublicense, and/or sell copies of the Software, 9 * and to permit persons to whom the Software is furnished to do so, 10 * subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be 13 * included in all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22 */ 23 24 25#include <arch/generic/debug_uart_8250.h> 26#include <debug.h> 27#include <new> 28 29 30DebugUART8250::DebugUART8250(addr_t base, int64 clock) 31 : 32 DebugUART(base, clock) 33{ 34} 35 36 37DebugUART8250::~DebugUART8250() 38{ 39} 40 41 42#define UART_RHR 0 43#define UART_THR 0 44#define UART_DLL 0 45#define UART_IER 1 46#define UART_DLH 1 47#define UART_IIR 2 48#define UART_FCR 2 49#define UART_EFR 2 50#define UART_LCR 3 51#define UART_MCR 4 52#define UART_LSR 5 53#define UART_MSR 6 54#define UART_TCR 6 55#define UART_SPR 7 56#define UART_TLR 7 57 58#define LCR_8N1 0x03 59 60#define FCR_FIFO_EN 0x01 /* Fifo enable */ 61#define FCR_RXSR 0x02 /* Receiver soft reset */ 62#define FCR_TXSR 0x04 /* Transmitter soft reset */ 63 64#define MCR_DTR 0x01 65#define MCR_RTS 0x02 66#define MCR_DMA_EN 0x04 67#define MCR_TX_DFR 0x08 68 69#define LCR_WLS_MSK 0x03 /* character length select mask */ 70#define LCR_WLS_5 0x00 /* 5 bit character length */ 71#define LCR_WLS_6 0x01 /* 6 bit character length */ 72#define LCR_WLS_7 0x02 /* 7 bit character length */ 73#define LCR_WLS_8 0x03 /* 8 bit character length */ 74#define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */ 75#define LCR_PEN 0x08 /* Parity eneble */ 76#define LCR_EPS 0x10 /* Even Parity Select */ 77#define LCR_STKP 0x20 /* Stick Parity */ 78#define LCR_SBRK 0x40 /* Set Break */ 79#define LCR_BKSE 0x80 /* Bank select enable */ 80 81#define LSR_DR 0x01 /* Data ready */ 82#define LSR_OE 0x02 /* Overrun */ 83#define LSR_PE 0x04 /* Parity error */ 84#define LSR_FE 0x08 /* Framing error */ 85#define LSR_BI 0x10 /* Break */ 86#define LSR_THRE 0x20 /* Xmit holding register empty */ 87#define LSR_TEMT 0x40 /* Xmitter empty */ 88#define LSR_ERR 0x80 /* Error */ 89 90 91void 92DebugUART8250::InitPort(uint32 baud) 93{ 94 Disable(); 95 96 uint16 baudDivisor = Clock() / (16 * baud); 97 98 // Write standard uart settings 99 Out8(UART_LCR, LCR_8N1); 100 // 8N1 101 Out8(UART_IER, 0); 102 // Disable interrupt 103 Out8(UART_FCR, 0); 104 // Disable FIFO 105 Out8(UART_MCR, MCR_DTR | MCR_RTS); 106 // DTR / RTS 107 108 // Gain access to, and program baud divisor 109 unsigned char buffer = In8(UART_LCR); 110 Out8(UART_LCR, buffer | LCR_BKSE); 111 Out8(UART_DLL, baudDivisor & 0xff); 112 Out8(UART_DLH, (baudDivisor >> 8) & 0xff); 113 Out8(UART_LCR, buffer & ~LCR_BKSE); 114 115// Out8(UART_MDR1, 0); // UART 16x mode 116// Out8(UART_LCR, 0xBF); // config mode B 117// Out8(UART_EFR, (1<<7)|(1<<6)); // hw flow control 118// Out8(UART_LCR, LCR_8N1); // operational mode 119 120 Enable(); 121} 122 123 124void 125DebugUART8250::InitEarly() 126{ 127} 128 129 130void 131DebugUART8250::Init() 132{ 133} 134 135 136int 137DebugUART8250::PutChar(char c) 138{ 139 while (!(In8(UART_LSR) & (1<<6))); 140 // wait for the last char to get out 141 Out8(UART_THR, c); 142 return 0; 143} 144 145 146/* returns -1 if no data available */ 147int 148DebugUART8250::GetChar(bool wait) 149{ 150 if (wait) { 151 while (!(In8(UART_LSR) & (1<<0))); 152 // wait for data to show up in the rx fifo 153 } else { 154 if (!(In8(UART_LSR) & (1<<0))) 155 return -1; 156 } 157 return In8(UART_RHR); 158} 159 160 161void 162DebugUART8250::FlushTx() 163{ 164 while (!(In8(UART_LSR) & (1<<6))); 165 // wait for the last char to get out 166} 167 168 169void 170DebugUART8250::FlushRx() 171{ 172 // empty the rx fifo 173 while (In8(UART_LSR) & (1<<0)) { 174 volatile char c = In8(UART_RHR); 175 (void)c; 176 } 177} 178 179 180DebugUART8250* 181arch_get_uart_8250(addr_t base, int64 clock) 182{ 183 static char buffer[sizeof(DebugUART8250)]; 184 DebugUART8250* uart = new(buffer) DebugUART8250(base, clock); 185 return uart; 186} 187 188