You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
123 lines
3.2 KiB
123 lines
3.2 KiB
/*
|
|
* 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/udbg.h>
|
|
#include <asm/io.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 */
|
|
udbg_putc = udbg_550_putc;
|
|
udbg_getc = udbg_550_getc;
|
|
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;
|
|
|
|
udbg_putc = udbg_maple_real_putc;
|
|
udbg_getc = NULL;
|
|
udbg_getc_poll = NULL;
|
|
}
|
|
#endif /* CONFIG_PPC_MAPLE */
|
|
|