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

   1 /*
   2  *  arch/arm/mach-vexpress/include/mach/uncompress.h
   3  *
   4  *  Copyright (C) 2003 ARM Limited
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #define AMBA_UART_DR(base)      (*(volatile unsigned char *)((base) + 0x00))
  21 #define AMBA_UART_LCRH(base)    (*(volatile unsigned char *)((base) + 0x2c))
  22 #define AMBA_UART_CR(base)      (*(volatile unsigned char *)((base) + 0x30))
  23 #define AMBA_UART_FR(base)      (*(volatile unsigned char *)((base) + 0x18))
  24
  25 #define UART_BASE       0x10009000
  26 #define UART_BASE_RS1   0x1c090000
  27
  28 static unsigned long get_uart_base(void)
  29 {
  30 #if defined(CONFIG_DEBUG_VEXPRESS_UART0_DETECT)
  31         unsigned long mpcore_periph;
  32
  33         /*
  34          * Make an educated guess regarding the memory map:
  35          * - the original A9 core tile, which has MPCore peripherals
  36          *   located at 0x1e000000, should use UART at 0x10009000
  37          * - all other (RS1 complaint) tiles use UART mapped
  38          *   at 0x1c090000
  39          */
  40         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (mpcore_periph));
  41
  42         if (mpcore_periph == 0x1e000000)
  43                 return UART_BASE;
  44         else
  45                 return UART_BASE_RS1;
  46 #elif defined(CONFIG_DEBUG_VEXPRESS_UART0_CA9)
  47         return UART_BASE;
  48 #elif defined(CONFIG_DEBUG_VEXPRESS_UART0_RS1)
  49         return UART_BASE_RS1;
  50 #else
  51         return 0;
  52 #endif
  53 }
  54
  55 /*
  56  * This does not append a newline
  57  */
  58 static inline void putc(int c)
  59 {
  60         unsigned long base = get_uart_base();
  61
  62         if (!base)
  63                 return;
  64
  65         while (AMBA_UART_FR(base) & (1 << 5))
  66                 barrier();
  67
  68         AMBA_UART_DR(base) = c;
  69 }
  70
  71 static inline void flush(void)
  72 {
  73         unsigned long base = get_uart_base();
  74
  75         if (!base)
  76                 return;
  77
  78         while (AMBA_UART_FR(base) & (1 << 3))
  79                 barrier();
  80 }
  81
  82 /*
  83  * nothing to do
  84  */
  85 #define arch_decomp_setup()
  86 #define arch_decomp_wdog()