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1da177e4 LT |
1 | /* gdb-io.c: FR403 GDB stub I/O |
2 | * | |
3 | * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/string.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/signal.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/console.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/serial_reg.h> | |
20 | ||
21 | #include <asm/pgtable.h> | |
1da177e4 LT |
22 | #include <asm/irc-regs.h> |
23 | #include <asm/timer-regs.h> | |
24 | #include <asm/gdb-stub.h> | |
25 | #include "gdb-io.h" | |
26 | ||
27 | #ifdef CONFIG_GDBSTUB_UART0 | |
28 | #define __UART(X) (*(volatile uint8_t *)(UART0_BASE + (UART_##X))) | |
29 | #define __UART_IRR_NMI 0xff0f0000 | |
30 | #else /* CONFIG_GDBSTUB_UART1 */ | |
31 | #define __UART(X) (*(volatile uint8_t *)(UART1_BASE + (UART_##X))) | |
32 | #define __UART_IRR_NMI 0xfff00000 | |
33 | #endif | |
34 | ||
35 | #define LSR_WAIT_FOR(STATE) \ | |
36 | do { \ | |
37 | gdbstub_do_rx(); \ | |
38 | } while (!(__UART(LSR) & UART_LSR_##STATE)) | |
39 | ||
40 | #define FLOWCTL_QUERY(LINE) ({ __UART(MSR) & UART_MSR_##LINE; }) | |
41 | #define FLOWCTL_CLEAR(LINE) do { __UART(MCR) &= ~UART_MCR_##LINE; mb(); } while (0) | |
42 | #define FLOWCTL_SET(LINE) do { __UART(MCR) |= UART_MCR_##LINE; mb(); } while (0) | |
43 | ||
44 | #define FLOWCTL_WAIT_FOR(LINE) \ | |
45 | do { \ | |
46 | gdbstub_do_rx(); \ | |
47 | } while(!FLOWCTL_QUERY(LINE)) | |
48 | ||
49 | /*****************************************************************************/ | |
50 | /* | |
51 | * initialise the GDB stub | |
52 | * - called with PSR.ET==0, so can't incur external interrupts | |
53 | */ | |
54 | void gdbstub_io_init(void) | |
55 | { | |
56 | /* set up the serial port */ | |
57 | __UART(LCR) = UART_LCR_WLEN8; /* 1N8 */ | |
58 | __UART(FCR) = | |
59 | UART_FCR_ENABLE_FIFO | | |
60 | UART_FCR_CLEAR_RCVR | | |
61 | UART_FCR_CLEAR_XMIT | | |
62 | UART_FCR_TRIGGER_1; | |
63 | ||
64 | FLOWCTL_CLEAR(DTR); | |
65 | FLOWCTL_SET(RTS); | |
66 | ||
67 | // gdbstub_set_baud(115200); | |
68 | ||
69 | /* we want to get serial receive interrupts */ | |
70 | __UART(IER) = UART_IER_RDI | UART_IER_RLSI; | |
71 | mb(); | |
72 | ||
73 | __set_IRR(6, __UART_IRR_NMI); /* map ERRs and UARTx to NMI */ | |
74 | ||
75 | } /* end gdbstub_io_init() */ | |
76 | ||
77 | /*****************************************************************************/ | |
78 | /* | |
79 | * set up the GDB stub serial port baud rate timers | |
80 | */ | |
81 | void gdbstub_set_baud(unsigned baud) | |
82 | { | |
83 | unsigned value, high, low; | |
84 | u8 lcr; | |
85 | ||
86 | /* work out the divisor to give us the nearest higher baud rate */ | |
87 | value = __serial_clock_speed_HZ / 16 / baud; | |
88 | ||
89 | /* determine the baud rate range */ | |
90 | high = __serial_clock_speed_HZ / 16 / value; | |
91 | low = __serial_clock_speed_HZ / 16 / (value + 1); | |
92 | ||
93 | /* pick the nearest bound */ | |
94 | if (low + (high - low) / 2 > baud) | |
95 | value++; | |
96 | ||
97 | lcr = __UART(LCR); | |
98 | __UART(LCR) |= UART_LCR_DLAB; | |
99 | mb(); | |
100 | __UART(DLL) = value & 0xff; | |
101 | __UART(DLM) = (value >> 8) & 0xff; | |
102 | mb(); | |
103 | __UART(LCR) = lcr; | |
104 | mb(); | |
105 | ||
106 | } /* end gdbstub_set_baud() */ | |
107 | ||
108 | /*****************************************************************************/ | |
109 | /* | |
110 | * receive characters into the receive FIFO | |
111 | */ | |
112 | void gdbstub_do_rx(void) | |
113 | { | |
114 | unsigned ix, nix; | |
115 | ||
116 | ix = gdbstub_rx_inp; | |
117 | ||
118 | while (__UART(LSR) & UART_LSR_DR) { | |
119 | nix = (ix + 2) & 0xfff; | |
120 | if (nix == gdbstub_rx_outp) | |
121 | break; | |
122 | ||
123 | gdbstub_rx_buffer[ix++] = __UART(LSR); | |
124 | gdbstub_rx_buffer[ix++] = __UART(RX); | |
125 | ix = nix; | |
126 | } | |
127 | ||
128 | gdbstub_rx_inp = ix; | |
129 | ||
130 | __clr_RC(15); | |
131 | __clr_IRL(); | |
132 | ||
133 | } /* end gdbstub_do_rx() */ | |
134 | ||
135 | /*****************************************************************************/ | |
136 | /* | |
137 | * wait for a character to come from the debugger | |
138 | */ | |
139 | int gdbstub_rx_char(unsigned char *_ch, int nonblock) | |
140 | { | |
141 | unsigned ix; | |
142 | u8 ch, st; | |
143 | ||
144 | *_ch = 0xff; | |
145 | ||
146 | if (gdbstub_rx_unget) { | |
147 | *_ch = gdbstub_rx_unget; | |
148 | gdbstub_rx_unget = 0; | |
149 | return 0; | |
150 | } | |
151 | ||
152 | try_again: | |
153 | gdbstub_do_rx(); | |
154 | ||
155 | /* pull chars out of the buffer */ | |
156 | ix = gdbstub_rx_outp; | |
157 | if (ix == gdbstub_rx_inp) { | |
158 | if (nonblock) | |
159 | return -EAGAIN; | |
160 | //watchdog_alert_counter = 0; | |
161 | goto try_again; | |
162 | } | |
163 | ||
164 | st = gdbstub_rx_buffer[ix++]; | |
165 | ch = gdbstub_rx_buffer[ix++]; | |
166 | gdbstub_rx_outp = ix & 0x00000fff; | |
167 | ||
168 | if (st & UART_LSR_BI) { | |
169 | gdbstub_proto("### GDB Rx Break Detected ###\n"); | |
170 | return -EINTR; | |
171 | } | |
172 | else if (st & (UART_LSR_FE|UART_LSR_OE|UART_LSR_PE)) { | |
7ca8b9c0 | 173 | gdbstub_io("### GDB Rx Error (st=%02x) ###\n",st); |
1da177e4 LT |
174 | return -EIO; |
175 | } | |
176 | else { | |
7ca8b9c0 | 177 | gdbstub_io("### GDB Rx %02x (st=%02x) ###\n",ch,st); |
1da177e4 LT |
178 | *_ch = ch & 0x7f; |
179 | return 0; | |
180 | } | |
181 | ||
182 | } /* end gdbstub_rx_char() */ | |
183 | ||
184 | /*****************************************************************************/ | |
185 | /* | |
186 | * send a character to the debugger | |
187 | */ | |
188 | void gdbstub_tx_char(unsigned char ch) | |
189 | { | |
190 | FLOWCTL_SET(DTR); | |
191 | LSR_WAIT_FOR(THRE); | |
192 | // FLOWCTL_WAIT_FOR(CTS); | |
193 | ||
194 | if (ch == 0x0a) { | |
195 | __UART(TX) = 0x0d; | |
196 | mb(); | |
197 | LSR_WAIT_FOR(THRE); | |
198 | // FLOWCTL_WAIT_FOR(CTS); | |
199 | } | |
200 | __UART(TX) = ch; | |
201 | mb(); | |
202 | ||
203 | FLOWCTL_CLEAR(DTR); | |
204 | } /* end gdbstub_tx_char() */ | |
205 | ||
206 | /*****************************************************************************/ | |
207 | /* | |
208 | * send a character to the debugger | |
209 | */ | |
210 | void gdbstub_tx_flush(void) | |
211 | { | |
212 | LSR_WAIT_FOR(TEMT); | |
213 | LSR_WAIT_FOR(THRE); | |
214 | FLOWCTL_CLEAR(DTR); | |
215 | } /* end gdbstub_tx_flush() */ |