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1da177e4 LT |
1 | /* |
2 | * Carsten Langgaard, carstenl@mips.com | |
3 | * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can distribute it and/or modify it | |
6 | * under the terms of the GNU General Public License (Version 2) as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
17 | * | |
18 | * This is the interface to the remote debugger stub. | |
19 | */ | |
20 | #include <asm/io.h> | |
21 | #include <asm/mips-boards/atlas.h> | |
22 | #include <asm/mips-boards/saa9730_uart.h> | |
23 | ||
24 | #define INB(a) inb((unsigned long)a) | |
21a151d8 | 25 | #define OUTB(x, a) outb(x, (unsigned long)a) |
1da177e4 LT |
26 | |
27 | /* | |
28 | * This is the interface to the remote debugger stub | |
29 | * if the Philips part is used for the debug port, | |
30 | * called from the platform setup code. | |
31 | */ | |
32 | void *saa9730_base = (void *)ATLAS_SAA9730_REG; | |
33 | ||
34 | static int saa9730_kgdb_active = 0; | |
35 | ||
36 | #define SAA9730_BAUDCLOCK(baud) (((ATLAS_SAA9730_BAUDCLOCK/(baud))/16)-1) | |
37 | ||
38 | int saa9730_kgdb_hook(int speed) | |
39 | { | |
40 | int baudclock; | |
41 | t_uart_saa9730_regmap *kgdb_uart = (t_uart_saa9730_regmap *)(saa9730_base + SAA9730_UART_REGS_ADDR); | |
42 | ||
43 | /* | |
44 | * Clear all interrupts | |
45 | */ | |
46 | (void) INB(&kgdb_uart->Lsr); | |
47 | (void) INB(&kgdb_uart->Msr); | |
48 | (void) INB(&kgdb_uart->Thr_Rbr); | |
49 | (void) INB(&kgdb_uart->Iir_Fcr); | |
50 | ||
51 | /* | |
52 | * Now, initialize the UART | |
53 | */ | |
54 | /* 8 data bits, one stop bit, no parity */ | |
55 | OUTB(SAA9730_LCR_DATA8, &kgdb_uart->Lcr); | |
56 | ||
57 | baudclock = SAA9730_BAUDCLOCK(speed); | |
58 | ||
59 | OUTB((baudclock >> 16) & 0xff, &kgdb_uart->BaudDivMsb); | |
60 | OUTB( baudclock & 0xff, &kgdb_uart->BaudDivLsb); | |
61 | ||
62 | /* Set RTS/DTR active */ | |
63 | OUTB(SAA9730_MCR_DTR | SAA9730_MCR_RTS, &kgdb_uart->Mcr); | |
64 | saa9730_kgdb_active = 1; | |
65 | ||
66 | return speed; | |
67 | } | |
68 | ||
69 | int saa9730_putDebugChar(char c) | |
70 | { | |
71 | t_uart_saa9730_regmap *kgdb_uart = (t_uart_saa9730_regmap *)(saa9730_base + SAA9730_UART_REGS_ADDR); | |
72 | ||
73 | if (!saa9730_kgdb_active) { /* need to init device first */ | |
74 | return 0; | |
75 | } | |
76 | ||
77 | while (!(INB(&kgdb_uart->Lsr) & SAA9730_LSR_THRE)) | |
78 | ; | |
79 | OUTB(c, &kgdb_uart->Thr_Rbr); | |
80 | ||
81 | return 1; | |
82 | } | |
83 | ||
84 | char saa9730_getDebugChar(void) | |
85 | { | |
86 | t_uart_saa9730_regmap *kgdb_uart = (t_uart_saa9730_regmap *)(saa9730_base + SAA9730_UART_REGS_ADDR); | |
87 | char c; | |
88 | ||
89 | if (!saa9730_kgdb_active) { /* need to init device first */ | |
90 | return 0; | |
91 | } | |
92 | while (!(INB(&kgdb_uart->Lsr) & SAA9730_LSR_DR)) | |
93 | ; | |
94 | ||
95 | c = INB(&kgdb_uart->Thr_Rbr); | |
96 | return(c); | |
97 | } |