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.
135 lines
3.0 KiB
135 lines
3.0 KiB
/*
|
|
* udbg for for zilog scc ports as found on Apple PowerMacs
|
|
*
|
|
* 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/processor.h>
|
|
#include <asm/io.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/pmac_feature.h>
|
|
|
|
extern u8 real_readb(volatile u8 __iomem *addr);
|
|
extern void real_writeb(u8 data, volatile u8 __iomem *addr);
|
|
|
|
#define SCC_TXRDY 4
|
|
#define SCC_RXRDY 1
|
|
|
|
static volatile u8 __iomem *sccc;
|
|
static volatile u8 __iomem *sccd;
|
|
|
|
static void udbg_scc_putc(unsigned char c)
|
|
{
|
|
if (sccc) {
|
|
while ((in_8(sccc) & SCC_TXRDY) == 0)
|
|
;
|
|
out_8(sccd, c);
|
|
if (c == '\n')
|
|
udbg_scc_putc('\r');
|
|
}
|
|
}
|
|
|
|
static int udbg_scc_getc_poll(void)
|
|
{
|
|
if (sccc) {
|
|
if ((in_8(sccc) & SCC_RXRDY) != 0)
|
|
return in_8(sccd);
|
|
else
|
|
return -1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static unsigned char udbg_scc_getc(void)
|
|
{
|
|
if (sccc) {
|
|
while ((in_8(sccc) & SCC_RXRDY) == 0)
|
|
;
|
|
return in_8(sccd);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static unsigned char scc_inittab[] = {
|
|
13, 0, /* set baud rate divisor */
|
|
12, 0,
|
|
14, 1, /* baud rate gen enable, src=rtxc */
|
|
11, 0x50, /* clocks = br gen */
|
|
5, 0xea, /* tx 8 bits, assert DTR & RTS */
|
|
4, 0x46, /* x16 clock, 1 stop */
|
|
3, 0xc1, /* rx enable, 8 bits */
|
|
};
|
|
|
|
void udbg_init_scc(struct device_node *np)
|
|
{
|
|
u32 *reg;
|
|
unsigned long addr;
|
|
int i, x;
|
|
|
|
if (np == NULL)
|
|
np = of_find_node_by_name(NULL, "escc");
|
|
if (np == NULL || np->parent == NULL)
|
|
return;
|
|
|
|
udbg_printf("found SCC...\n");
|
|
/* Get address within mac-io ASIC */
|
|
reg = (u32 *)get_property(np, "reg", NULL);
|
|
if (reg == NULL)
|
|
return;
|
|
addr = reg[0];
|
|
udbg_printf("local addr: %lx\n", addr);
|
|
/* Get address of mac-io PCI itself */
|
|
reg = (u32 *)get_property(np->parent, "assigned-addresses", NULL);
|
|
if (reg == NULL)
|
|
return;
|
|
addr += reg[2];
|
|
udbg_printf("final addr: %lx\n", addr);
|
|
|
|
/* Setup for 57600 8N1 */
|
|
addr += 0x20;
|
|
sccc = (volatile u8 * __iomem) ioremap(addr & PAGE_MASK, PAGE_SIZE) ;
|
|
sccc += addr & ~PAGE_MASK;
|
|
sccd = sccc + 0x10;
|
|
|
|
udbg_printf("ioremap result sccc: %p\n", sccc);
|
|
mb();
|
|
|
|
for (i = 20000; i != 0; --i)
|
|
x = in_8(sccc);
|
|
out_8(sccc, 0x09); /* reset A or B side */
|
|
out_8(sccc, 0xc0);
|
|
for (i = 0; i < sizeof(scc_inittab); ++i)
|
|
out_8(sccc, scc_inittab[i]);
|
|
|
|
udbg_putc = udbg_scc_putc;
|
|
udbg_getc = udbg_scc_getc;
|
|
udbg_getc_poll = udbg_scc_getc_poll;
|
|
|
|
udbg_puts("Hello World !\n");
|
|
}
|
|
|
|
static void udbg_real_scc_putc(unsigned char c)
|
|
{
|
|
while ((real_readb(sccc) & SCC_TXRDY) == 0)
|
|
;
|
|
real_writeb(c, sccd);
|
|
if (c == '\n')
|
|
udbg_real_scc_putc('\r');
|
|
}
|
|
|
|
void udbg_init_pmac_realmode(void)
|
|
{
|
|
sccc = (volatile u8 __iomem *)0x80013020ul;
|
|
sccd = (volatile u8 __iomem *)0x80013030ul;
|
|
|
|
udbg_putc = udbg_real_scc_putc;
|
|
udbg_getc = NULL;
|
|
udbg_getc_poll = NULL;
|
|
}
|
|
|