projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * kgdb io functions for DDB5476. We use the second serial port. | |
| 3 | * | |
| 4 | * Copyright (C) 2001 MontaVista Software Inc. | |
| 5 | * Author: jsun@mvista.com or jsun@junsun.net | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify it | |
| 8 | * under the terms of the GNU General Public License as published by the | |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your | |
| 10 | * option) any later version. | |
| 11 | * | |
| 12 | */ | |
| 13 | ||
| 14 | /* ======================= CONFIG ======================== */ | |
| 15 | ||
| 16 | /* [jsun] we use the second serial port for kdb */ | |
| 17 | #define BASE 0xa60002f8 | |
| 18 | #define MAX_BAUD 115200 | |
| 19 | ||
| 20 | /* distance in bytes between two serial registers */ | |
| 21 | #define REG_OFFSET 1 | |
| 22 | ||
| 23 | /* | |
| 24 | * 0 - kgdb does serial init | |
| 25 | * 1 - kgdb skip serial init | |
| 26 | */ | |
| 27 | static int remoteDebugInitialized = 0; | |
| 28 | ||
| 29 | /* | |
| 30 | * the default baud rate *if* kgdb does serial init | |
| 31 | */ | |
| 32 | #define BAUD_DEFAULT UART16550_BAUD_38400 | |
| 33 | ||
| 34 | /* ======================= END OF CONFIG ======================== */ | |
| 35 | ||
| 36 | typedef unsigned char uint8; | |
| 37 | typedef unsigned int uint32; | |
| 38 | ||
| 39 | #define UART16550_BAUD_2400 2400 | |
| 40 | #define UART16550_BAUD_4800 4800 | |
| 41 | #define UART16550_BAUD_9600 9600 | |
| 42 | #define UART16550_BAUD_19200 19200 | |
| 43 | #define UART16550_BAUD_38400 38400 | |
| 44 | #define UART16550_BAUD_57600 57600 | |
| 45 | #define UART16550_BAUD_115200 115200 | |
| 46 | ||
| 47 | #define UART16550_PARITY_NONE 0 | |
| 48 | #define UART16550_PARITY_ODD 0x08 | |
| 49 | #define UART16550_PARITY_EVEN 0x18 | |
| 50 | #define UART16550_PARITY_MARK 0x28 | |
| 51 | #define UART16550_PARITY_SPACE 0x38 | |
| 52 | ||
| 53 | #define UART16550_DATA_5BIT 0x0 | |
| 54 | #define UART16550_DATA_6BIT 0x1 | |
| 55 | #define UART16550_DATA_7BIT 0x2 | |
| 56 | #define UART16550_DATA_8BIT 0x3 | |
| 57 | ||
| 58 | #define UART16550_STOP_1BIT 0x0 | |
| 59 | #define UART16550_STOP_2BIT 0x4 | |
| 60 | ||
| 61 | /* register offset */ | |
| 62 | #define OFS_RCV_BUFFER 0 | |
| 63 | #define OFS_TRANS_HOLD 0 | |
| 64 | #define OFS_SEND_BUFFER 0 | |
| 65 | #define OFS_INTR_ENABLE (1*REG_OFFSET) | |
| 66 | #define OFS_INTR_ID (2*REG_OFFSET) | |
| 67 | #define OFS_DATA_FORMAT (3*REG_OFFSET) | |
| 68 | #define OFS_LINE_CONTROL (3*REG_OFFSET) | |
| 69 | #define OFS_MODEM_CONTROL (4*REG_OFFSET) | |
| 70 | #define OFS_RS232_OUTPUT (4*REG_OFFSET) | |
| 71 | #define OFS_LINE_STATUS (5*REG_OFFSET) | |
| 72 | #define OFS_MODEM_STATUS (6*REG_OFFSET) | |
| 73 | #define OFS_RS232_INPUT (6*REG_OFFSET) | |
| 74 | #define OFS_SCRATCH_PAD (7*REG_OFFSET) | |
| 75 | ||
| 76 | #define OFS_DIVISOR_LSB (0*REG_OFFSET) | |
| 77 | #define OFS_DIVISOR_MSB (1*REG_OFFSET) | |
| 78 | ||
| 79 | ||
| 80 | /* memory-mapped read/write of the port */ | |
| 81 | #define UART16550_READ(y) (*((volatile uint8*)(BASE + y))) | |
| 82 | #define UART16550_WRITE(y, z) ((*((volatile uint8*)(BASE + y))) = z) | |
| 83 | ||
| 84 | void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop) | |
| 85 | { | |
| 86 | /* disable interrupts */ | |
| 87 | UART16550_WRITE(OFS_INTR_ENABLE, 0); | |
| 88 | ||
| 89 | /* set up buad rate */ | |
| 90 | { | |
| 91 | uint32 divisor; | |
| 92 | ||
| 93 | /* set DIAB bit */ | |
| 94 | UART16550_WRITE(OFS_LINE_CONTROL, 0x80); | |
| 95 | ||
| 96 | /* set divisor */ | |
| 97 | divisor = MAX_BAUD / baud; | |
| 98 | UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff); | |
| 99 | UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8); | |
| 100 | ||
| 101 | /* clear DIAB bit */ | |
| 102 | UART16550_WRITE(OFS_LINE_CONTROL, 0x0); | |
| 103 | } | |
| 104 | ||
| 105 | /* set data format */ | |
| 106 | UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop); | |
| 107 | } | |
| 108 | ||
| 109 | ||
| 110 | uint8 getDebugChar(void) | |
| 111 | { | |
| 112 | if (!remoteDebugInitialized) { | |
| 113 | remoteDebugInitialized = 1; | |
| 114 | debugInit(BAUD_DEFAULT, | |
| 115 | UART16550_DATA_8BIT, | |
| 116 | UART16550_PARITY_NONE, UART16550_STOP_1BIT); | |
| 117 | } | |
| 118 | ||
| 119 | while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0); | |
| 120 | return UART16550_READ(OFS_RCV_BUFFER); | |
| 121 | } | |
| 122 | ||
| 123 | ||
| 124 | int putDebugChar(uint8 byte) | |
| 125 | { | |
| 126 | if (!remoteDebugInitialized) { | |
| 127 | remoteDebugInitialized = 1; | |
| 128 | debugInit(BAUD_DEFAULT, | |
| 129 | UART16550_DATA_8BIT, | |
| 130 | UART16550_PARITY_NONE, UART16550_STOP_1BIT); | |
| 131 | } | |
| 132 | ||
| 133 | while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0); | |
| 134 | UART16550_WRITE(OFS_SEND_BUFFER, byte); | |
| 135 | return 1; | |
| 136 | } |