forked from Minki/linux
b77bb37a2a
This reverts commit 97475f8b42e83be2966aa2d70ab9c98477701c53 (lmo) /
82b89152f0 (kernel.org) [MIPS: LD/SD o32
macro GAS fix update].
Turns out this patch is producing many build errors with gcc 4.2. Based
on further testing with a test case extracted from the build errors found
further build errors and suboptimal generation even in violation of the
"R" constraint.
To make matters worse, the binutils changes also don't work quite as
intended so revert this patch for now.
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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