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/arch/hardware.h>
  24
  25 unsigned int system_rev;
  26
  27 #define UART_OMAP_MDR1          0x08    /* mode definition register */
  28 #define OMAP_ID_730             0x355F
  29 #define ID_MASK                 0x7fff
  30 #define check_port(base, shift) ((base[UART_OMAP_MDR1 << shift] & 7) == 0)
  31 #define omap_get_id() ((*(volatile unsigned int *)(0xfffed404)) >> 12) & ID_MASK
  32
  33 static void
  34 putstr(const char *s)
  35 {
  36         volatile u8 * uart = 0;
  37         int shift;
  38
  39 #ifdef  CONFIG_OMAP_LL_DEBUG_UART3
  40         uart = (volatile u8 *)(OMAP_UART3_BASE);
  41 #elif   CONFIG_OMAP_LL_DEBUG_UART2
  42         uart = (volatile u8 *)(OMAP_UART2_BASE);
  43 #else
  44         uart = (volatile u8 *)(OMAP_UART1_BASE);
  45 #endif
  46
  47         /* Determine which serial port to use */
  48         do {
  49                 /* MMU is not on, so cpu_is_omapXXXX() won't work here */
  50                 unsigned int omap_id = omap_get_id();
  51
  52                 if (omap_id == OMAP_ID_730)
  53                         shift = 0;
  54                 else
  55                         shift = 2;
  56
  57                 if (check_port(uart, shift))
  58                         break;
  59                 /* Silent boot if no serial ports are enabled. */
  60                 return;
  61         } while (0);
  62
  63         /*
  64          * Now, xmit each character
  65          */
  66         while (*s) {
  67                 while (!(uart[UART_LSR << shift] & UART_LSR_THRE))
  68                         barrier();
  69                 uart[UART_TX << shift] = *s;
  70                 if (*s++ == '\n') {
  71                         while (!(uart[UART_LSR << shift] & UART_LSR_THRE))
  72                                 barrier();
  73                         uart[UART_TX << shift] = '\r';
  74                 }
  75         }
  76 }
  77
  78 /*
  79  * nothing to do
  80  */
  81 #define arch_decomp_setup()
  82 #define arch_decomp_wdog()