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

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * arch/arm/mach-pxa/include/mach/uncompress.h
   4 *
   5 * Author:      Nicolas Pitre
   6 * Copyright:   (C) 2001 MontaVista Software Inc.
   7 */
   8
   9#include <linux/serial_reg.h>
  10#include <asm/mach-types.h>
  11
  12#define FFUART_BASE     (0x40100000)
  13#define BTUART_BASE     (0x40200000)
  14#define STUART_BASE     (0x40700000)
  15
  16unsigned long uart_base;
  17unsigned int uart_shift;
  18unsigned int uart_is_pxa;
  19
  20static inline unsigned char uart_read(int offset)
  21{
  22        return *(volatile unsigned char *)(uart_base + (offset << uart_shift));
  23}
  24
  25static inline void uart_write(unsigned char val, int offset)
  26{
  27        *(volatile unsigned char *)(uart_base + (offset << uart_shift)) = val;
  28}
  29
  30static inline int uart_is_enabled(void)
  31{
  32        /* assume enabled by default for non-PXA uarts */
  33        return uart_is_pxa ? uart_read(UART_IER) & UART_IER_UUE : 1;
  34}
  35
  36static inline void putc(char c)
  37{
  38        if (!uart_is_enabled())
  39                return;
  40
  41        while (!(uart_read(UART_LSR) & UART_LSR_THRE))
  42                barrier();
  43
  44        uart_write(c, UART_TX);
  45}
  46
  47/*
  48 * This does not append a newline
  49 */
  50static inline void flush(void)
  51{
  52}
  53
  54static inline void arch_decomp_setup(void)
  55{
  56        /* initialize to default */
  57        uart_base = FFUART_BASE;
  58        uart_shift = 2;
  59        uart_is_pxa = 1;
  60
  61        if (machine_is_littleton() || machine_is_intelmote2()
  62            || machine_is_csb726() || machine_is_stargate2()
  63            || machine_is_cm_x300() || machine_is_balloon3())
  64                uart_base = STUART_BASE;
  65
  66        if (machine_is_arcom_zeus()) {
  67                uart_base = 0x10000000; /* nCS4 */
  68                uart_shift = 1;
  69                uart_is_pxa = 0;
  70        }
  71}
  72