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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/frv/kernel/gdb-io.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/frv/kernel/gdb-io.c')
-rw-r--r--arch/frv/kernel/gdb-io.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/arch/frv/kernel/gdb-io.c b/arch/frv/kernel/gdb-io.c
new file mode 100644
index 00000000000..c997bccb922
--- /dev/null
+++ b/arch/frv/kernel/gdb-io.c
@@ -0,0 +1,216 @@
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>
22#include <asm/system.h>
23#include <asm/irc-regs.h>
24#include <asm/timer-regs.h>
25#include <asm/gdb-stub.h>
26#include "gdb-io.h"
27
28#ifdef CONFIG_GDBSTUB_UART0
29#define __UART(X) (*(volatile uint8_t *)(UART0_BASE + (UART_##X)))
30#define __UART_IRR_NMI 0xff0f0000
31#else /* CONFIG_GDBSTUB_UART1 */
32#define __UART(X) (*(volatile uint8_t *)(UART1_BASE + (UART_##X)))
33#define __UART_IRR_NMI 0xfff00000
34#endif
35
36#define LSR_WAIT_FOR(STATE) \
37do { \
38 gdbstub_do_rx(); \
39} while (!(__UART(LSR) & UART_LSR_##STATE))
40
41#define FLOWCTL_QUERY(LINE) ({ __UART(MSR) & UART_MSR_##LINE; })
42#define FLOWCTL_CLEAR(LINE) do { __UART(MCR) &= ~UART_MCR_##LINE; mb(); } while (0)
43#define FLOWCTL_SET(LINE) do { __UART(MCR) |= UART_MCR_##LINE; mb(); } while (0)
44
45#define FLOWCTL_WAIT_FOR(LINE) \
46do { \
47 gdbstub_do_rx(); \
48} while(!FLOWCTL_QUERY(LINE))
49
50/*****************************************************************************/
51/*
52 * initialise the GDB stub
53 * - called with PSR.ET==0, so can't incur external interrupts
54 */
55void gdbstub_io_init(void)
56{
57 /* set up the serial port */
58 __UART(LCR) = UART_LCR_WLEN8; /* 1N8 */
59 __UART(FCR) =
60 UART_FCR_ENABLE_FIFO |
61 UART_FCR_CLEAR_RCVR |
62 UART_FCR_CLEAR_XMIT |
63 UART_FCR_TRIGGER_1;
64
65 FLOWCTL_CLEAR(DTR);
66 FLOWCTL_SET(RTS);
67
68// gdbstub_set_baud(115200);
69
70 /* we want to get serial receive interrupts */
71 __UART(IER) = UART_IER_RDI | UART_IER_RLSI;
72 mb();
73
74 __set_IRR(6, __UART_IRR_NMI); /* map ERRs and UARTx to NMI */
75
76} /* end gdbstub_io_init() */
77
78/*****************************************************************************/
79/*
80 * set up the GDB stub serial port baud rate timers
81 */
82void gdbstub_set_baud(unsigned baud)
83{
84 unsigned value, high, low;
85 u8 lcr;
86
87 /* work out the divisor to give us the nearest higher baud rate */
88 value = __serial_clock_speed_HZ / 16 / baud;
89
90 /* determine the baud rate range */
91 high = __serial_clock_speed_HZ / 16 / value;
92 low = __serial_clock_speed_HZ / 16 / (value + 1);
93
94 /* pick the nearest bound */
95 if (low + (high - low) / 2 > baud)
96 value++;
97
98 lcr = __UART(LCR);
99 __UART(LCR) |= UART_LCR_DLAB;
100 mb();
101 __UART(DLL) = value & 0xff;
102 __UART(DLM) = (value >> 8) & 0xff;
103 mb();
104 __UART(LCR) = lcr;
105 mb();
106
107} /* end gdbstub_set_baud() */
108
109/*****************************************************************************/
110/*
111 * receive characters into the receive FIFO
112 */
113void gdbstub_do_rx(void)
114{
115 unsigned ix, nix;
116
117 ix = gdbstub_rx_inp;
118
119 while (__UART(LSR) & UART_LSR_DR) {
120 nix = (ix + 2) & 0xfff;
121 if (nix == gdbstub_rx_outp)
122 break;
123
124 gdbstub_rx_buffer[ix++] = __UART(LSR);
125 gdbstub_rx_buffer[ix++] = __UART(RX);
126 ix = nix;
127 }
128
129 gdbstub_rx_inp = ix;
130
131 __clr_RC(15);
132 __clr_IRL();
133
134} /* end gdbstub_do_rx() */
135
136/*****************************************************************************/
137/*
138 * wait for a character to come from the debugger
139 */
140int gdbstub_rx_char(unsigned char *_ch, int nonblock)
141{
142 unsigned ix;
143 u8 ch, st;
144
145 *_ch = 0xff;
146
147 if (gdbstub_rx_unget) {
148 *_ch = gdbstub_rx_unget;
149 gdbstub_rx_unget = 0;
150 return 0;
151 }
152
153 try_again:
154 gdbstub_do_rx();
155
156 /* pull chars out of the buffer */
157 ix = gdbstub_rx_outp;
158 if (ix == gdbstub_rx_inp) {
159 if (nonblock)
160 return -EAGAIN;
161 //watchdog_alert_counter = 0;
162 goto try_again;
163 }
164
165 st = gdbstub_rx_buffer[ix++];
166 ch = gdbstub_rx_buffer[ix++];
167 gdbstub_rx_outp = ix & 0x00000fff;
168
169 if (st & UART_LSR_BI) {
170 gdbstub_proto("### GDB Rx Break Detected ###\n");
171 return -EINTR;
172 }
173 else if (st & (UART_LSR_FE|UART_LSR_OE|UART_LSR_PE)) {
174 gdbstub_proto("### GDB Rx Error (st=%02x) ###\n",st);
175 return -EIO;
176 }
177 else {
178 gdbstub_proto("### GDB Rx %02x (st=%02x) ###\n",ch,st);
179 *_ch = ch & 0x7f;
180 return 0;
181 }
182
183} /* end gdbstub_rx_char() */
184
185/*****************************************************************************/
186/*
187 * send a character to the debugger
188 */
189void gdbstub_tx_char(unsigned char ch)
190{
191 FLOWCTL_SET(DTR);
192 LSR_WAIT_FOR(THRE);
193// FLOWCTL_WAIT_FOR(CTS);
194
195 if (ch == 0x0a) {
196 __UART(TX) = 0x0d;
197 mb();
198 LSR_WAIT_FOR(THRE);
199// FLOWCTL_WAIT_FOR(CTS);
200 }
201 __UART(TX) = ch;
202 mb();
203
204 FLOWCTL_CLEAR(DTR);
205} /* end gdbstub_tx_char() */
206
207/*****************************************************************************/
208/*
209 * send a character to the debugger
210 */
211void gdbstub_tx_flush(void)
212{
213 LSR_WAIT_FOR(TEMT);
214 LSR_WAIT_FOR(THRE);
215 FLOWCTL_CLEAR(DTR);
216} /* end gdbstub_tx_flush() */