mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
cfdb7d564c
Add choice for low-level debug UART. Similar to i.MX6, there is a numeric configuration, valid choices are 0 to 3. Note that the kernel assumes that the boot loader initialized clock properly. Signed-off-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
38 lines
1.0 KiB
ArmAsm
38 lines
1.0 KiB
ArmAsm
/*
|
|
* Copyright 2013 Freescale Semiconductor, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#define VF_UART0_BASE_ADDR 0x40027000
|
|
#define VF_UART1_BASE_ADDR 0x40028000
|
|
#define VF_UART2_BASE_ADDR 0x40029000
|
|
#define VF_UART3_BASE_ADDR 0x4002a000
|
|
#define VF_UART_BASE_ADDR(n) VF_UART##n##_BASE_ADDR
|
|
#define VF_UART_BASE(n) VF_UART_BASE_ADDR(n)
|
|
#define VF_UART_PHYSICAL_BASE VF_UART_BASE(CONFIG_DEBUG_VF_UART_PORT)
|
|
|
|
#define VF_UART_VIRTUAL_BASE 0xfe000000
|
|
|
|
.macro addruart, rp, rv, tmp
|
|
ldr \rp, =VF_UART_PHYSICAL_BASE @ physical
|
|
and \rv, \rp, #0xffffff @ offset within 16MB section
|
|
add \rv, \rv, #VF_UART_VIRTUAL_BASE
|
|
.endm
|
|
|
|
.macro senduart, rd, rx
|
|
strb \rd, [\rx, #0x7] @ Data Register
|
|
.endm
|
|
|
|
.macro busyuart, rd, rx
|
|
1001: ldrb \rd, [\rx, #0x4] @ Status Register 1
|
|
tst \rd, #1 << 6 @ TC
|
|
beq 1001b @ wait until transmit done
|
|
.endm
|
|
|
|
.macro waituart,rd,rx
|
|
.endm
|