arch/arm/mach-davinci/include/mach/uncompress.h

   1 /*
   2  * Serial port stubs for kernel decompress status messages
   3  *
   4  * Initially based on:
   5  * arch/arm/plat-omap/include/mach/uncompress.h
   6  *
   7  * Original copyrights follow.
   8  *
   9  * Copyright (C) 2000 RidgeRun, Inc.
  10  * Author: Greg Lonnon <glonnon@ridgerun.com>
  11  *
  12  * Rewritten by:
  13  * Author: <source@mvista.com>
  14  * 2004 (c) MontaVista Software, Inc.
  15  *
  16  * This file is licensed under the terms of the GNU General Public License
  17  * version 2. This program is licensed "as is" without any warranty of any
  18  * kind, whether express or implied.
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/serial_reg.h>
  23
  24 #include <asm/mach-types.h>
  25
  26 #include <mach/serial.h>
  27
  28 #define IOMEM(x)        ((void __force __iomem *)(x))
  29
  30 u32 *uart;
  31
  32 /* PORT_16C550A, in polled non-fifo mode */
  33 static void putc(char c)
  34 {
  35         if (!uart)
  36                 return;
  37
  38         while (!(uart[UART_LSR] & UART_LSR_THRE))
  39                 barrier();
  40         uart[UART_TX] = c;
  41 }
  42
  43 static inline void flush(void)
  44 {
  45         if (!uart)
  46                 return;
  47
  48         while (!(uart[UART_LSR] & UART_LSR_THRE))
  49                 barrier();
  50 }
  51
  52 static inline void set_uart_info(u32 phys)
  53 {
  54         uart = (u32 *)phys;
  55 }
  56
  57 #define _DEBUG_LL_ENTRY(machine, phys)                          \
  58         {                                                       \
  59                 if (machine_is_##machine()) {                   \
  60                         set_uart_info(phys);                    \
  61                         break;                                  \
  62                 }                                               \
  63         }
  64
  65 #define DEBUG_LL_DAVINCI(machine, port)                         \
  66         _DEBUG_LL_ENTRY(machine, DAVINCI_UART##port##_BASE)
  67
  68 #define DEBUG_LL_DA8XX(machine, port)                           \
  69         _DEBUG_LL_ENTRY(machine, DA8XX_UART##port##_BASE)
  70
  71 static inline void __arch_decomp_setup(unsigned long arch_id)
  72 {
  73         /*
  74          * Initialize the port based on the machine ID from the bootloader.
  75          * Note that we're using macros here instead of switch statement
  76          * as machine_is functions are optimized out for the boards that
  77          * are not selected.
  78          */
  79         do {
  80                 /* Davinci boards */
  81                 DEBUG_LL_DAVINCI(davinci_evm,           0);
  82                 DEBUG_LL_DAVINCI(sffsdr,                0);
  83                 DEBUG_LL_DAVINCI(neuros_osd2,           0);
  84                 DEBUG_LL_DAVINCI(davinci_dm355_evm,     0);
  85                 DEBUG_LL_DAVINCI(dm355_leopard,         0);
  86                 DEBUG_LL_DAVINCI(davinci_dm6467_evm,    0);
  87                 DEBUG_LL_DAVINCI(davinci_dm365_evm,     0);
  88
  89                 /* DA8xx boards */
  90                 DEBUG_LL_DA8XX(davinci_da830_evm,       2);
  91                 DEBUG_LL_DA8XX(davinci_da850_evm,       2);
  92                 DEBUG_LL_DA8XX(mityomapl138,            1);
  93                 DEBUG_LL_DA8XX(omapl138_hawkboard,      2);
  94         } while (0);
  95 }
  96
  97 #define arch_decomp_setup()     __arch_decomp_setup(arch_id)