mirror of https://gitee.com/openkylin/linux.git
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2001, 2002, 2004 Ralf Baechle
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/console.h>
|
|
#include <linux/kdev_t.h>
|
|
#include <linux/major.h>
|
|
#include <linux/termios.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/tty.h>
|
|
|
|
#include <linux/serial.h>
|
|
#include <linux/serial_core.h>
|
|
#include <asm/serial.h>
|
|
#include <asm/io.h>
|
|
|
|
/* SUPERIO uart register map */
|
|
struct yo_uartregs {
|
|
union {
|
|
volatile u8 rbr; /* read only, DLAB == 0 */
|
|
volatile u8 thr; /* write only, DLAB == 0 */
|
|
volatile u8 dll; /* DLAB == 1 */
|
|
} u1;
|
|
union {
|
|
volatile u8 ier; /* DLAB == 0 */
|
|
volatile u8 dlm; /* DLAB == 1 */
|
|
} u2;
|
|
union {
|
|
volatile u8 iir; /* read only */
|
|
volatile u8 fcr; /* write only */
|
|
} u3;
|
|
volatile u8 iu_lcr;
|
|
volatile u8 iu_mcr;
|
|
volatile u8 iu_lsr;
|
|
volatile u8 iu_msr;
|
|
volatile u8 iu_scr;
|
|
} yo_uregs_t;
|
|
|
|
#define iu_rbr u1.rbr
|
|
#define iu_thr u1.thr
|
|
#define iu_dll u1.dll
|
|
#define iu_ier u2.ier
|
|
#define iu_dlm u2.dlm
|
|
#define iu_iir u3.iir
|
|
#define iu_fcr u3.fcr
|
|
|
|
#define ssnop() __asm__ __volatile__("sll $0, $0, 1\n");
|
|
#define ssnop_4() do { ssnop(); ssnop(); ssnop(); ssnop(); } while (0)
|
|
|
|
#define IO_BASE_64 0x9000000000000000ULL
|
|
|
|
static unsigned char readb_outer_space(unsigned long long phys)
|
|
{
|
|
unsigned long long vaddr = IO_BASE_64 | phys;
|
|
unsigned char res;
|
|
unsigned int sr;
|
|
|
|
sr = read_c0_status();
|
|
write_c0_status((sr | ST0_KX) & ~ ST0_IE);
|
|
ssnop_4();
|
|
|
|
__asm__ __volatile__ (
|
|
" .set mips3 \n"
|
|
" ld %0, %1 \n"
|
|
" lbu %0, (%0) \n"
|
|
" .set mips0 \n"
|
|
: "=r" (res)
|
|
: "m" (vaddr));
|
|
|
|
write_c0_status(sr);
|
|
ssnop_4();
|
|
|
|
return res;
|
|
}
|
|
|
|
static void writeb_outer_space(unsigned long long phys, unsigned char c)
|
|
{
|
|
unsigned long long vaddr = IO_BASE_64 | phys;
|
|
unsigned long tmp;
|
|
unsigned int sr;
|
|
|
|
sr = read_c0_status();
|
|
write_c0_status((sr | ST0_KX) & ~ ST0_IE);
|
|
ssnop_4();
|
|
|
|
__asm__ __volatile__ (
|
|
" .set mips3 \n"
|
|
" ld %0, %1 \n"
|
|
" sb %2, (%0) \n"
|
|
" .set mips0 \n"
|
|
: "=&r" (tmp)
|
|
: "m" (vaddr), "r" (c));
|
|
|
|
write_c0_status(sr);
|
|
ssnop_4();
|
|
}
|
|
|
|
void prom_putchar(char c)
|
|
{
|
|
unsigned long lsr = 0xfd000008ULL + offsetof(struct yo_uartregs, iu_lsr);
|
|
unsigned long thr = 0xfd000008ULL + offsetof(struct yo_uartregs, iu_thr);
|
|
|
|
while ((readb_outer_space(lsr) & 0x20) == 0);
|
|
writeb_outer_space(thr, c);
|
|
}
|