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   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * arch/arm/include/debug/8250.S
   4  *
   5  *  Copyright (C) 1994-2013 Russell King
   6  */
   7 #include <linux/serial_reg.h>
   8
   9                 .macro  addruart, rp, rv, tmp
  10                 ldr     \rp, =CONFIG_DEBUG_UART_PHYS
  11                 ldr     \rv, =CONFIG_DEBUG_UART_VIRT
  12                 .endm
  13
  14 #ifdef CONFIG_DEBUG_UART_8250_WORD
  15                 .macro  store, rd, rx:vararg
  16                 str     \rd, \rx
  17                 .endm
  18
  19                 .macro  load, rd, rx:vararg
  20                 ldr     \rd, \rx
  21                 .endm
  22 #else
  23                 .macro  store, rd, rx:vararg
  24                 strb    \rd, \rx
  25                 .endm
  26
  27                 .macro  load, rd, rx:vararg
  28                 ldrb    \rd, \rx
  29                 .endm
  30 #endif
  31
  32 #define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT
  33
  34                 .macro  senduart,rd,rx
  35                 store   \rd, [\rx, #UART_TX << UART_SHIFT]
  36                 .endm
  37
  38                 .macro  busyuart,rd,rx
  39 1002:           load    \rd, [\rx, #UART_LSR << UART_SHIFT]
  40                 and     \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
  41                 teq     \rd, #UART_LSR_TEMT | UART_LSR_THRE
  42                 bne     1002b
  43                 .endm
  44
  45                 .macro  waituart,rd,rx
  46 #ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL
  47 1001:           load    \rd, [\rx, #UART_MSR << UART_SHIFT]
  48                 tst     \rd, #UART_MSR_CTS
  49                 beq     1001b
  50 #endif
  51                 .endm