| Ralf Baechle | 35189fa | 2006-06-18 16:39:46 +0100 | [diff] [blame^] | 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 | } |