LXR linux/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
  19unsigned long uart_base;
  20unsigned int uart_shift;
  21unsigned int uart_is_pxa;
  22
  23static inline unsigned char uart_read(int offset)
  24{
  25        return *(volatile unsigned char *)(uart_base + (offset << uart_shift));
  26}
  27
  28static inline void uart_write(unsigned char val, int offset)
  29{
  30        *(volatile unsigned char *)(uart_base + (offset << uart_shift)) = val;
  31}
  32
  33static 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
  39static 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 */
  53static inline void flush(void)
  54{
  55}
  56
  57static 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