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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | /* * 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); } char __init prom_getchar(void) { return 0; } |