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

   1 /*
   2  * arch/arm/mach-pxa/include/mach/uncompress.h
   3  *
   4  * Author:      Nicolas Pitre
   5  * Copyright:   (C) 2001 MontaVista Software Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/serial_reg.h>
  13 #include <asm/mach-types.h>
  14
  15 #define FFUART_BASE     (0x40100000)
  16 #define BTUART_BASE     (0x40200000)
  17 #define STUART_BASE     (0x40700000)
  18
  19 static unsigned long uart_base;
  20 static unsigned int uart_shift;
  21 static unsigned int uart_is_pxa;
  22
  23 static inline unsigned char uart_read(int offset)
  24 {
  25         return *(volatile unsigned char *)(uart_base + (offset << uart_shift));
  26 }
  27
  28 static inline void uart_write(unsigned char val, int offset)
  29 {
  30         *(volatile unsigned char *)(uart_base + (offset << uart_shift)) = val;
  31 }
  32
  33 static inline int uart_is_enabled(void)
  34 {
  35         /* assume enabled by default for non-PXA uarts */
  36         return uart_is_pxa ? uart_read(UART_IER) & UART_IER_UUE : 1;
  37 }
  38
  39 static inline void putc(char c)
  40 {
  41         if (!uart_is_enabled())
  42                 return;
  43
  44         while (!(uart_read(UART_LSR) & UART_LSR_THRE))
  45                 barrier();
  46
  47         uart_write(c, UART_TX);
  48 }
  49
  50 /*
  51  * This does not append a newline
  52  */
  53 static inline void flush(void)
  54 {
  55 }
  56
  57 static inline void arch_decomp_setup(void)
  58 {
  59         /* initialize to default */
  60         uart_base = FFUART_BASE;
  61         uart_shift = 2;
  62         uart_is_pxa = 1;
  63
  64         if (machine_is_littleton() || machine_is_intelmote2()
  65             || machine_is_csb726() || machine_is_stargate2()
  66             || machine_is_cm_x300() || machine_is_balloon3())
  67                 uart_base = STUART_BASE;
  68
  69         if (machine_is_arcom_zeus()) {
  70                 uart_base = 0x10000000; /* nCS4 */
  71                 uart_shift = 1;
  72                 uart_is_pxa = 0;
  73         }
  74 }
  75
  76 /*
  77  * nothing to do
  78  */
  79 #define arch_decomp_wdog()