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35189fad RB |
1 | /* |
2 | * Copyright (C) 2004 by Basler Vision Technologies AG | |
3 | * Author: Thomas Koeller <thomas.koeller@baslerweb.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/config.h> | |
21 | #include <linux/linkage.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <asm/gdb-stub.h> | |
25 | #include <asm/rm9k-ocd.h> | |
26 | #include <excite.h> | |
27 | ||
28 | #if defined(CONFIG_SERIAL_8250) && CONFIG_SERIAL_8250_NR_UARTS > 1 | |
29 | #error Debug port used by serial driver | |
30 | #endif | |
31 | ||
32 | #define UART_CLK 25000000 | |
33 | #define BASE_BAUD (UART_CLK / 16) | |
34 | #define REGISTER_BASE_0 0x0208UL | |
35 | #define REGISTER_BASE_1 0x0238UL | |
36 | ||
37 | #define REGISTER_BASE_DBG REGISTER_BASE_1 | |
38 | ||
39 | #define CPRR 0x0004 | |
40 | #define UACFG 0x0200 | |
41 | #define UAINTS 0x0204 | |
42 | #define UARBR (REGISTER_BASE_DBG + 0x0000) | |
43 | #define UATHR (REGISTER_BASE_DBG + 0x0004) | |
44 | #define UADLL (REGISTER_BASE_DBG + 0x0008) | |
45 | #define UAIER (REGISTER_BASE_DBG + 0x000c) | |
46 | #define UADLH (REGISTER_BASE_DBG + 0x0010) | |
47 | #define UAIIR (REGISTER_BASE_DBG + 0x0014) | |
48 | #define UAFCR (REGISTER_BASE_DBG + 0x0018) | |
49 | #define UALCR (REGISTER_BASE_DBG + 0x001c) | |
50 | #define UAMCR (REGISTER_BASE_DBG + 0x0020) | |
51 | #define UALSR (REGISTER_BASE_DBG + 0x0024) | |
52 | #define UAMSR (REGISTER_BASE_DBG + 0x0028) | |
53 | #define UASCR (REGISTER_BASE_DBG + 0x002c) | |
54 | ||
55 | #define PARITY_NONE 0 | |
56 | #define PARITY_ODD 0x08 | |
57 | #define PARITY_EVEN 0x18 | |
58 | #define PARITY_MARK 0x28 | |
59 | #define PARITY_SPACE 0x38 | |
60 | ||
61 | #define DATA_5BIT 0x0 | |
62 | #define DATA_6BIT 0x1 | |
63 | #define DATA_7BIT 0x2 | |
64 | #define DATA_8BIT 0x3 | |
65 | ||
66 | #define STOP_1BIT 0x0 | |
67 | #define STOP_2BIT 0x4 | |
68 | ||
69 | #define BAUD_DBG 57600 | |
70 | #define PARITY_DBG PARITY_NONE | |
71 | #define DATA_DBG DATA_8BIT | |
72 | #define STOP_DBG STOP_1BIT | |
73 | ||
74 | /* Initialize the serial port for KGDB debugging */ | |
75 | void __init excite_kgdb_init(void) | |
76 | { | |
77 | const u32 divisor = BASE_BAUD / BAUD_DBG; | |
78 | ||
79 | /* Take the UART out of reset */ | |
80 | titan_writel(0x00ff1cff, CPRR); | |
81 | titan_writel(0x00000000, UACFG); | |
82 | titan_writel(0x00000002, UACFG); | |
83 | ||
84 | titan_writel(0x0, UALCR); | |
85 | titan_writel(0x0, UAIER); | |
86 | ||
87 | /* Disable FIFOs */ | |
88 | titan_writel(0x00, UAFCR); | |
89 | ||
90 | titan_writel(0x80, UALCR); | |
91 | titan_writel(divisor & 0xff, UADLL); | |
92 | titan_writel((divisor & 0xff00) >> 8, UADLH); | |
93 | titan_writel(0x0, UALCR); | |
94 | ||
95 | titan_writel(DATA_DBG | PARITY_DBG | STOP_DBG, UALCR); | |
96 | ||
97 | /* Enable receiver interrupt */ | |
98 | titan_readl(UARBR); | |
99 | titan_writel(0x1, UAIER); | |
100 | } | |
101 | ||
102 | int getDebugChar(void) | |
103 | { | |
104 | while (!(titan_readl(UALSR) & 0x1)); | |
105 | return titan_readl(UARBR); | |
106 | } | |
107 | ||
108 | int putDebugChar(int data) | |
109 | { | |
110 | while (!(titan_readl(UALSR) & 0x20)); | |
111 | titan_writel(data, UATHR); | |
112 | return 1; | |
113 | } | |
114 | ||
115 | /* KGDB interrupt handler */ | |
116 | asmlinkage void excite_kgdb_inthdl(struct pt_regs *regs) | |
117 | { | |
118 | if (unlikely( | |
119 | ((titan_readl(UAIIR) & 0x7) == 4) | |
120 | && ((titan_readl(UARBR) & 0xff) == 0x3))) | |
121 | set_async_breakpoint(®s->cp0_epc); | |
122 | } |