arch/mips/momentum/jaguar_atx/ja-console.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2001, 2002, 2004 Ralf Baechle
   7  */
   8 #include <linux/init.h>
   9 #include <linux/console.h>
  10 #include <linux/kdev_t.h>
  11 #include <linux/major.h>
  12 #include <linux/termios.h>
  13 #include <linux/sched.h>
  14 #include <linux/tty.h>
  15
  16 #include <linux/serial.h>
  17 #include <linux/serial_core.h>
  18 #include <asm/serial.h>
  19
  20 /* SUPERIO uart register map */
  21 struct ja_uartregs {
  22         union {
  23                 volatile u8     pad0[3];
  24                 volatile u8     rbr;    /* read only, DLAB == 0 */
  25                 volatile u8     pad1[3];
  26                 volatile u8     thr;    /* write only, DLAB == 0 */
  27                 volatile u8     pad2[3];
  28                 volatile u8     dll;    /* DLAB == 1 */
  29         } u1;
  30         union {
  31                 volatile u8     pad0[3];
  32                 volatile u8     ier;    /* DLAB == 0 */
  33                 volatile u8     pad1[3];
  34                 volatile u8     dlm;    /* DLAB == 1 */
  35         } u2;
  36         union {
  37                 volatile u8     pad0[3];
  38                 volatile u8     iir;    /* read only */
  39                 volatile u8     pad1[3];
  40                 volatile u8     fcr;    /* write only */
  41         } u3;
  42         volatile u8     pad0[3];
  43         volatile u8     iu_lcr;
  44         volatile u8     pad1[3];
  45         volatile u8     iu_mcr;
  46         volatile u8     pad2[3];
  47         volatile u8     iu_lsr;
  48         volatile u8     pad3[3];
  49         volatile u8     iu_msr;
  50         volatile u8     pad4[3];
  51         volatile u8     iu_scr;
  52 } ja_uregs_t;
  53
  54 #define iu_rbr u1.rbr
  55 #define iu_thr u1.thr
  56 #define iu_dll u1.dll
  57 #define iu_ier u2.ier
  58 #define iu_dlm u2.dlm
  59 #define iu_iir u3.iir
  60 #define iu_fcr u3.fcr
  61
  62 extern unsigned long uart_base;
  63
  64 static inline struct ja_uartregs *console_uart(void)
  65 {
  66         return (struct ja_uartregs *) (uart_base + 0x23UL);
  67 }
  68
  69 void prom_putchar(char c)
  70 {
  71         struct ja_uartregs *uart = console_uart();
  72
  73         while ((uart->iu_lsr & 0x20) == 0);
  74         uart->iu_thr = c;
  75 }
  76
  77 char __init prom_getchar(void)
  78 {
  79         return 0;
  80 }
  81
  82 static void inline ja_console_probe(void)
  83 {
  84         struct uart_port up;
  85
  86         /*
  87          * Register to interrupt zero because we share the interrupt with
  88          * the serial driver which we don't properly support yet.
  89          */
  90         memset(&up, 0, sizeof(up));
  91         up.membase      = (unsigned char *) uart_base + 0x23UL;
  92         up.irq          = JAGUAR_ATX_SERIAL1_IRQ;
  93         up.uartclk      = JAGUAR_ATX_UART_CLK;
  94         up.regshift     = 2;
  95         up.iotype       = UPIO_MEM;
  96         up.flags        = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST;
  97         up.line         = 0;
  98
  99         if (early_serial_setup(&up))
 100                 printk(KERN_ERR "Early serial init of port 0 failed\n");
 101 }
 102
 103 __init void ja_setup_console(void)
 104 {
 105         ja_console_probe();
 106 }