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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | /* gdb-io.c: FR403 GDB stub I/O * * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program 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. */ #include <linux/string.h> #include <linux/kernel.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/console.h> #include <linux/init.h> #include <linux/serial_reg.h> #include <asm/pgtable.h> #include <asm/system.h> #include <asm/irc-regs.h> #include <asm/timer-regs.h> #include <asm/gdb-stub.h> #include "gdb-io.h" #ifdef CONFIG_GDBSTUB_UART0 #define __UART(X) (*(volatile uint8_t *)(UART0_BASE + (UART_##X))) #define __UART_IRR_NMI 0xff0f0000 #else /* CONFIG_GDBSTUB_UART1 */ #define __UART(X) (*(volatile uint8_t *)(UART1_BASE + (UART_##X))) #define __UART_IRR_NMI 0xfff00000 #endif #define LSR_WAIT_FOR(STATE) \ do { \ gdbstub_do_rx(); \ } while (!(__UART(LSR) & UART_LSR_##STATE)) #define FLOWCTL_QUERY(LINE) ({ __UART(MSR) & UART_MSR_##LINE; }) #define FLOWCTL_CLEAR(LINE) do { __UART(MCR) &= ~UART_MCR_##LINE; mb(); } while (0) #define FLOWCTL_SET(LINE) do { __UART(MCR) |= UART_MCR_##LINE; mb(); } while (0) #define FLOWCTL_WAIT_FOR(LINE) \ do { \ gdbstub_do_rx(); \ } while(!FLOWCTL_QUERY(LINE)) /*****************************************************************************/ /* * initialise the GDB stub * - called with PSR.ET==0, so can't incur external interrupts */ void gdbstub_io_init(void) { /* set up the serial port */ __UART(LCR) = UART_LCR_WLEN8; /* 1N8 */ __UART(FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_1; FLOWCTL_CLEAR(DTR); FLOWCTL_SET(RTS); // gdbstub_set_baud(115200); /* we want to get serial receive interrupts */ __UART(IER) = UART_IER_RDI | UART_IER_RLSI; mb(); __set_IRR(6, __UART_IRR_NMI); /* map ERRs and UARTx to NMI */ } /* end gdbstub_io_init() */ /*****************************************************************************/ /* * set up the GDB stub serial port baud rate timers */ void gdbstub_set_baud(unsigned baud) { unsigned value, high, low; u8 lcr; /* work out the divisor to give us the nearest higher baud rate */ value = __serial_clock_speed_HZ / 16 / baud; /* determine the baud rate range */ high = __serial_clock_speed_HZ / 16 / value; low = __serial_clock_speed_HZ / 16 / (value + 1); /* pick the nearest bound */ if (low + (high - low) / 2 > baud) value++; lcr = __UART(LCR); __UART(LCR) |= UART_LCR_DLAB; mb(); __UART(DLL) = value & 0xff; __UART(DLM) = (value >> 8) & 0xff; mb(); __UART(LCR) = lcr; mb(); } /* end gdbstub_set_baud() */ /*****************************************************************************/ /* * receive characters into the receive FIFO */ void gdbstub_do_rx(void) { unsigned ix, nix; ix = gdbstub_rx_inp; while (__UART(LSR) & UART_LSR_DR) { nix = (ix + 2) & 0xfff; if (nix == gdbstub_rx_outp) break; gdbstub_rx_buffer[ix++] = __UART(LSR); gdbstub_rx_buffer[ix++] = __UART(RX); ix = nix; } gdbstub_rx_inp = ix; __clr_RC(15); __clr_IRL(); } /* end gdbstub_do_rx() */ /*****************************************************************************/ /* * wait for a character to come from the debugger */ int gdbstub_rx_char(unsigned char *_ch, int nonblock) { unsigned ix; u8 ch, st; *_ch = 0xff; if (gdbstub_rx_unget) { *_ch = gdbstub_rx_unget; gdbstub_rx_unget = 0; return 0; } try_again: gdbstub_do_rx(); /* pull chars out of the buffer */ ix = gdbstub_rx_outp; if (ix == gdbstub_rx_inp) { if (nonblock) return -EAGAIN; //watchdog_alert_counter = 0; goto try_again; } st = gdbstub_rx_buffer[ix++]; ch = gdbstub_rx_buffer[ix++]; gdbstub_rx_outp = ix & 0x00000fff; if (st & UART_LSR_BI) { gdbstub_proto("### GDB Rx Break Detected ###\n"); return -EINTR; } else if (st & (UART_LSR_FE|UART_LSR_OE|UART_LSR_PE)) { gdbstub_proto("### GDB Rx Error (st=%02x) ###\n",st); return -EIO; } else { gdbstub_proto("### GDB Rx %02x (st=%02x) ###\n",ch,st); *_ch = ch & 0x7f; return 0; } } /* end gdbstub_rx_char() */ /*****************************************************************************/ /* * send a character to the debugger */ void gdbstub_tx_char(unsigned char ch) { FLOWCTL_SET(DTR); LSR_WAIT_FOR(THRE); // FLOWCTL_WAIT_FOR(CTS); if (ch == 0x0a) { __UART(TX) = 0x0d; mb(); LSR_WAIT_FOR(THRE); // FLOWCTL_WAIT_FOR(CTS); } __UART(TX) = ch; mb(); FLOWCTL_CLEAR(DTR); } /* end gdbstub_tx_char() */ /*****************************************************************************/ /* * send a character to the debugger */ void gdbstub_tx_flush(void) { LSR_WAIT_FOR(TEMT); LSR_WAIT_FOR(THRE); FLOWCTL_CLEAR(DTR); } /* end gdbstub_tx_flush() */ |