include/asm-arm/arch-omap/uncompress.h

   1 /*
   2  * linux/include/asm-arm/arch-omap/uncompress.h
   3  *
   4  * Serial port stubs for kernel decompress status messages
   5  *
   6  * Initially based on:
   7  * linux-2.4.15-rmk1-dsplinux1.6/include/asm-arm/arch-omap1510/uncompress.h
   8  * Copyright (C) 2000 RidgeRun, Inc.
   9  * Author: Greg Lonnon <glonnon@ridgerun.com>
  10  *
  11  * Rewritten by:
  12  * Author: <source@mvista.com>
  13  * 2004 (c) MontaVista Software, Inc.
  14  *
  15  * This file is licensed under the terms of the GNU General Public License
  16  * version 2. This program is licensed "as is" without any warranty of any
  17  * kind, whether express or implied.
  18  */
  19
  20 #include <linux/config.h>
  21 #include <linux/types.h>
  22 #include <linux/serial_reg.h>
  23 #include <asm/hardware.h>
  24 #include <asm/arch/serial.h>
  25
  26 #define UART_OMAP_MDR1          0x08    /* mode definition register */
  27 #define check_port(base, shift) ((base[UART_OMAP_MDR1 << shift] & 7) == 0)
  28 #define omap_get_id() ((*(volatile unsigned int *)(0xfffed404)) >> 12) & ID_MASK
  29
  30 static void
  31 puts(const char *s)
  32 {
  33         volatile u8 * uart = 0;
  34         int shift = 0;
  35
  36 #ifdef  CONFIG_OMAP_LL_DEBUG_UART3
  37         uart = (volatile u8 *)(OMAP_UART3_BASE);
  38 #elif   CONFIG_OMAP_LL_DEBUG_UART2
  39         uart = (volatile u8 *)(OMAP_UART2_BASE);
  40 #else
  41         uart = (volatile u8 *)(OMAP_UART1_BASE);
  42 #endif
  43
  44         /* Determine which serial port to use */
  45         do {
  46                 /* MMU is not on, so cpu_is_omapXXXX() won't work here */
  47                 unsigned int omap_id = omap_get_id();
  48
  49                 if (omap_id == OMAP_ID_1510 || omap_id == OMAP_ID_1610 ||
  50                     omap_id == OMAP_ID_1710 || omap_id == OMAP_ID_5912) {
  51                         shift = 2;
  52                 } else if (omap_id == OMAP_ID_730) {
  53                         shift = 0;
  54                 } else {
  55                         /* Assume nothing for unknown OMAP processors.
  56                          * Add an entry for your OMAP type to select
  57                          * the default serial console here. If the
  58                          * serial port is enabled, we'll use it to
  59                          * display status messages. Else we'll be
  60                          * quiet.
  61                          */
  62                         return;
  63                 }
  64                 if (check_port(uart, shift))
  65                         break;
  66                 /* Silent boot if no serial ports are enabled. */
  67                 return;
  68         } while (0);
  69
  70         /*
  71          * Now, xmit each character
  72          */
  73         while (*s) {
  74                 while (!(uart[UART_LSR << shift] & UART_LSR_THRE))
  75                         barrier();
  76                 uart[UART_TX << shift] = *s;
  77                 if (*s++ == '\n') {
  78                         while (!(uart[UART_LSR << shift] & UART_LSR_THRE))
  79                                 barrier();
  80                         uart[UART_TX << shift] = '\r';
  81                 }
  82         }
  83 }
  84
  85 /*
  86  * nothing to do
  87  */
  88 #define arch_decomp_setup()
  89 #define arch_decomp_wdog()