]>
Commit | Line | Data |
---|---|---|
7f853352 MM |
1 | /* |
2 | * udbg for for NS16550 compatable serial ports | |
3 | * | |
4 | * Copyright (C) 2001-2005 PPC 64 Team, IBM Corp | |
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 | #include <linux/config.h> | |
12 | #include <linux/types.h> | |
13 | #include <asm/ppcdebug.h> | |
14 | #include <asm/processor.h> | |
15 | #include <asm/naca.h> | |
16 | #include <asm/uaccess.h> | |
17 | #include <asm/machdep.h> | |
18 | #include <asm/io.h> | |
19 | #include <asm/prom.h> | |
20 | ||
21 | extern u8 real_readb(volatile u8 __iomem *addr); | |
22 | extern void real_writeb(u8 data, volatile u8 __iomem *addr); | |
23 | ||
24 | struct NS16550 { | |
25 | /* this struct must be packed */ | |
26 | unsigned char rbr; /* 0 */ | |
27 | unsigned char ier; /* 1 */ | |
28 | unsigned char fcr; /* 2 */ | |
29 | unsigned char lcr; /* 3 */ | |
30 | unsigned char mcr; /* 4 */ | |
31 | unsigned char lsr; /* 5 */ | |
32 | unsigned char msr; /* 6 */ | |
33 | unsigned char scr; /* 7 */ | |
34 | }; | |
35 | ||
36 | #define thr rbr | |
37 | #define iir fcr | |
38 | #define dll rbr | |
39 | #define dlm ier | |
40 | #define dlab lcr | |
41 | ||
42 | #define LSR_DR 0x01 /* Data ready */ | |
43 | #define LSR_OE 0x02 /* Overrun */ | |
44 | #define LSR_PE 0x04 /* Parity error */ | |
45 | #define LSR_FE 0x08 /* Framing error */ | |
46 | #define LSR_BI 0x10 /* Break */ | |
47 | #define LSR_THRE 0x20 /* Xmit holding register empty */ | |
48 | #define LSR_TEMT 0x40 /* Xmitter empty */ | |
49 | #define LSR_ERR 0x80 /* Error */ | |
50 | ||
51 | static volatile struct NS16550 __iomem *udbg_comport; | |
52 | ||
53 | static void udbg_550_putc(unsigned char c) | |
54 | { | |
55 | if (udbg_comport) { | |
56 | while ((in_8(&udbg_comport->lsr) & LSR_THRE) == 0) | |
57 | /* wait for idle */; | |
58 | out_8(&udbg_comport->thr, c); | |
59 | if (c == '\n') | |
60 | udbg_550_putc('\r'); | |
61 | } | |
62 | } | |
63 | ||
64 | static int udbg_550_getc_poll(void) | |
65 | { | |
66 | if (udbg_comport) { | |
67 | if ((in_8(&udbg_comport->lsr) & LSR_DR) != 0) | |
68 | return in_8(&udbg_comport->rbr); | |
69 | else | |
70 | return -1; | |
71 | } | |
72 | return -1; | |
73 | } | |
74 | ||
75 | static unsigned char udbg_550_getc(void) | |
76 | { | |
77 | if (udbg_comport) { | |
78 | while ((in_8(&udbg_comport->lsr) & LSR_DR) == 0) | |
79 | /* wait for char */; | |
80 | return in_8(&udbg_comport->rbr); | |
81 | } | |
82 | return 0; | |
83 | } | |
84 | ||
85 | void udbg_init_uart(void __iomem *comport, unsigned int speed) | |
86 | { | |
87 | u16 dll = speed ? (115200 / speed) : 12; | |
88 | ||
89 | if (comport) { | |
90 | udbg_comport = (struct NS16550 __iomem *)comport; | |
91 | out_8(&udbg_comport->lcr, 0x00); | |
92 | out_8(&udbg_comport->ier, 0xff); | |
93 | out_8(&udbg_comport->ier, 0x00); | |
94 | out_8(&udbg_comport->lcr, 0x80); /* Access baud rate */ | |
95 | out_8(&udbg_comport->dll, dll & 0xff); /* 1 = 115200, 2 = 57600, | |
96 | 3 = 38400, 12 = 9600 baud */ | |
97 | out_8(&udbg_comport->dlm, dll >> 8); /* dll >> 8 which should be zero | |
98 | for fast rates; */ | |
99 | out_8(&udbg_comport->lcr, 0x03); /* 8 data, 1 stop, no parity */ | |
100 | out_8(&udbg_comport->mcr, 0x03); /* RTS/DTR */ | |
101 | out_8(&udbg_comport->fcr ,0x07); /* Clear & enable FIFOs */ | |
c8f1c8be MM |
102 | udbg_putc = udbg_550_putc; |
103 | udbg_getc = udbg_550_getc; | |
104 | udbg_getc_poll = udbg_550_getc_poll; | |
7f853352 MM |
105 | } |
106 | } | |
107 | ||
108 | #ifdef CONFIG_PPC_MAPLE | |
109 | void udbg_maple_real_putc(unsigned char c) | |
110 | { | |
111 | if (udbg_comport) { | |
112 | while ((real_readb(&udbg_comport->lsr) & LSR_THRE) == 0) | |
113 | /* wait for idle */; | |
114 | real_writeb(c, &udbg_comport->thr); eieio(); | |
115 | if (c == '\n') | |
116 | udbg_maple_real_putc('\r'); | |
117 | } | |
118 | } | |
119 | ||
120 | void udbg_init_maple_realmode(void) | |
121 | { | |
122 | udbg_comport = (volatile struct NS16550 __iomem *)0xf40003f8; | |
123 | ||
c8f1c8be MM |
124 | udbg_putc = udbg_maple_real_putc; |
125 | udbg_getc = NULL; | |
126 | udbg_getc_poll = NULL; | |
7f853352 MM |
127 | } |
128 | #endif /* CONFIG_PPC_MAPLE */ |