arch/arm/include/debug/ks8695.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * arch/arm/include/debug/ks8695.S
   4  *
   5  * Copyright (C) 2006 Ben Dooks <ben@simtec.co.uk>
   6  * Copyright (C) 2006 Simtec Electronics
   7  *
   8  * KS8695 - Debug macros
   9  */
  10
  11 #define KS8695_UART_PA  0x03ffe000
  12 #define KS8695_UART_VA  0xf00fe000
  13 #define KS8695_URTH     (0x04)
  14 #define KS8695_URLS     (0x14)
  15 #define URLS_URTE       (1 << 6)
  16 #define URLS_URTHRE     (1 << 5)
  17
  18         .macro  addruart, rp, rv, tmp
  19                 ldr     \rp, =KS8695_UART_PA            @ physical base address
  20                 ldr     \rv, =KS8695_UART_VA            @ virtual base address
  21         .endm
  22
  23         .macro  senduart, rd, rx
  24                 str     \rd, [\rx, #KS8695_URTH]        @ Write to Transmit Holding Register
  25         .endm
  26
  27         .macro  busyuart, rd, rx
  28 1001:           ldr     \rd, [\rx, #KS8695_URLS]        @ Read Line Status Register
  29                 tst     \rd, #URLS_URTE                 @ Holding & Shift registers empty?
  30                 beq     1001b
  31         .endm
  32
  33         .macro  waituart, rd, rx
  34 1001:           ldr     \rd, [\rx, #KS8695_URLS]        @ Read Line Status Register
  35                 tst     \rd, #URLS_URTHRE               @ Holding Register empty?
  36                 beq     1001b
  37         .endm