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
  16 unsigned long uart_base;
  17 unsigned int uart_shift;
  18 unsigned int uart_is_pxa;
  19
  20 static inline unsigned char uart_read(int offset)
  21 {
  22         return *(volatile unsigned char *)(uart_base + (offset << uart_shift));
  23 }
  24
  25 static inline void uart_write(unsigned char val, int offset)
  26 {
  27         *(volatile unsigned char *)(uart_base + (offset << uart_shift)) = val;
  28 }
  29
  30 static 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
  36 static 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  */
  50 static inline void flush(void)
  51 {
  52 }
  53
  54 static 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 }