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[PATCH] ppc64: Split SCC and 15550 udbg code
Split scc and 15550 functions from udbg each into their own file. This makes them more symetric with the lpar and btext code. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
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Milton Miller
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Paul Mackerras
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Sep 6, 2005
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| /* | ||
| * udbg for for NS16550 compatable serial ports | ||
| * | ||
| * Copyright (C) 2001-2005 PPC 64 Team, IBM Corp | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License | ||
| * as published by the Free Software Foundation; either version | ||
| * 2 of the License, or (at your option) any later version. | ||
| */ | ||
| #include <linux/config.h> | ||
| #include <linux/types.h> | ||
| #include <asm/ppcdebug.h> | ||
| #include <asm/processor.h> | ||
| #include <asm/naca.h> | ||
| #include <asm/uaccess.h> | ||
| #include <asm/machdep.h> | ||
| #include <asm/io.h> | ||
| #include <asm/prom.h> | ||
|
|
||
| extern u8 real_readb(volatile u8 __iomem *addr); | ||
| extern void real_writeb(u8 data, volatile u8 __iomem *addr); | ||
|
|
||
| struct NS16550 { | ||
| /* this struct must be packed */ | ||
| unsigned char rbr; /* 0 */ | ||
| unsigned char ier; /* 1 */ | ||
| unsigned char fcr; /* 2 */ | ||
| unsigned char lcr; /* 3 */ | ||
| unsigned char mcr; /* 4 */ | ||
| unsigned char lsr; /* 5 */ | ||
| unsigned char msr; /* 6 */ | ||
| unsigned char scr; /* 7 */ | ||
| }; | ||
|
|
||
| #define thr rbr | ||
| #define iir fcr | ||
| #define dll rbr | ||
| #define dlm ier | ||
| #define dlab lcr | ||
|
|
||
| #define LSR_DR 0x01 /* Data ready */ | ||
| #define LSR_OE 0x02 /* Overrun */ | ||
| #define LSR_PE 0x04 /* Parity error */ | ||
| #define LSR_FE 0x08 /* Framing error */ | ||
| #define LSR_BI 0x10 /* Break */ | ||
| #define LSR_THRE 0x20 /* Xmit holding register empty */ | ||
| #define LSR_TEMT 0x40 /* Xmitter empty */ | ||
| #define LSR_ERR 0x80 /* Error */ | ||
|
|
||
| static volatile struct NS16550 __iomem *udbg_comport; | ||
|
|
||
| static void udbg_550_putc(unsigned char c) | ||
| { | ||
| if (udbg_comport) { | ||
| while ((in_8(&udbg_comport->lsr) & LSR_THRE) == 0) | ||
| /* wait for idle */; | ||
| out_8(&udbg_comport->thr, c); | ||
| if (c == '\n') | ||
| udbg_550_putc('\r'); | ||
| } | ||
| } | ||
|
|
||
| static int udbg_550_getc_poll(void) | ||
| { | ||
| if (udbg_comport) { | ||
| if ((in_8(&udbg_comport->lsr) & LSR_DR) != 0) | ||
| return in_8(&udbg_comport->rbr); | ||
| else | ||
| return -1; | ||
| } | ||
| return -1; | ||
| } | ||
|
|
||
| static unsigned char udbg_550_getc(void) | ||
| { | ||
| if (udbg_comport) { | ||
| while ((in_8(&udbg_comport->lsr) & LSR_DR) == 0) | ||
| /* wait for char */; | ||
| return in_8(&udbg_comport->rbr); | ||
| } | ||
| return 0; | ||
| } | ||
|
|
||
| void udbg_init_uart(void __iomem *comport, unsigned int speed) | ||
| { | ||
| u16 dll = speed ? (115200 / speed) : 12; | ||
|
|
||
| if (comport) { | ||
| udbg_comport = (struct NS16550 __iomem *)comport; | ||
| out_8(&udbg_comport->lcr, 0x00); | ||
| out_8(&udbg_comport->ier, 0xff); | ||
| out_8(&udbg_comport->ier, 0x00); | ||
| out_8(&udbg_comport->lcr, 0x80); /* Access baud rate */ | ||
| out_8(&udbg_comport->dll, dll & 0xff); /* 1 = 115200, 2 = 57600, | ||
| 3 = 38400, 12 = 9600 baud */ | ||
| out_8(&udbg_comport->dlm, dll >> 8); /* dll >> 8 which should be zero | ||
| for fast rates; */ | ||
| out_8(&udbg_comport->lcr, 0x03); /* 8 data, 1 stop, no parity */ | ||
| out_8(&udbg_comport->mcr, 0x03); /* RTS/DTR */ | ||
| out_8(&udbg_comport->fcr ,0x07); /* Clear & enable FIFOs */ | ||
| ppc_md.udbg_putc = udbg_550_putc; | ||
| ppc_md.udbg_getc = udbg_550_getc; | ||
| ppc_md.udbg_getc_poll = udbg_550_getc_poll; | ||
| } | ||
| } | ||
|
|
||
| #ifdef CONFIG_PPC_MAPLE | ||
| void udbg_maple_real_putc(unsigned char c) | ||
| { | ||
| if (udbg_comport) { | ||
| while ((real_readb(&udbg_comport->lsr) & LSR_THRE) == 0) | ||
| /* wait for idle */; | ||
| real_writeb(c, &udbg_comport->thr); eieio(); | ||
| if (c == '\n') | ||
| udbg_maple_real_putc('\r'); | ||
| } | ||
| } | ||
|
|
||
| void udbg_init_maple_realmode(void) | ||
| { | ||
| udbg_comport = (volatile struct NS16550 __iomem *)0xf40003f8; | ||
|
|
||
| ppc_md.udbg_putc = udbg_maple_real_putc; | ||
| ppc_md.udbg_getc = NULL; | ||
| ppc_md.udbg_getc_poll = NULL; | ||
| } | ||
| #endif /* CONFIG_PPC_MAPLE */ |
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