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