arch/arm/mach-lpc32xx/include/mach/uncompress.h

   1 /*
   2  * arch/arm/mach-lpc32xx/include/mach/uncompress.h
   3  *
   4  * Author: Kevin Wells <kevin.wells@nxp.com>
   5  *
   6  * Copyright (C) 2010 NXP Semiconductors
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #ifndef __ASM_ARM_ARCH_UNCOMPRESS_H
  20 #define __ASM_ARM_ARCH_UNCOMPRESS_H
  21
  22 #include <linux/io.h>
  23
  24 #include <mach/hardware.h>
  25 #include <mach/platform.h>
  26
  27 /*
  28  * Uncompress output is hardcoded to standard UART 5
  29  */
  30
  31 #define UART_FIFO_CTL_TX_RESET  (1 << 2)
  32 #define UART_STATUS_TX_MT       (1 << 6)
  33
  34 #define _UARTREG(x)             (void __iomem *)(LPC32XX_UART5_BASE + (x))
  35
  36 #define LPC32XX_UART_DLLFIFO_O  0x00
  37 #define LPC32XX_UART_IIRFCR_O   0x08
  38 #define LPC32XX_UART_LSR_O      0x14
  39
  40 static inline void putc(int ch)
  41 {
  42         /* Wait for transmit FIFO to empty */
  43         while ((__raw_readl(_UARTREG(LPC32XX_UART_LSR_O)) &
  44                 UART_STATUS_TX_MT) == 0)
  45                 ;
  46
  47         __raw_writel((u32) ch, _UARTREG(LPC32XX_UART_DLLFIFO_O));
  48 }
  49
  50 static inline void flush(void)
  51 {
  52         __raw_writel(__raw_readl(_UARTREG(LPC32XX_UART_IIRFCR_O)) |
  53                 UART_FIFO_CTL_TX_RESET, _UARTREG(LPC32XX_UART_IIRFCR_O));
  54 }
  55
  56 /* NULL functions; we don't presently need them */
  57 #define arch_decomp_setup()
  58
  59 #endif