mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 22:24:09 +08:00
3d82cbbb3a
For omap1, we'll keep mach/serial.h around for 8250.c hardware workarounds. For omap2+, we no longer need mach/serial.h and can make it local to mach-omap2. Signed-off-by: Tony Lindgren <tony@atomide.com>
102 lines
2.7 KiB
ArmAsm
102 lines
2.7 KiB
ArmAsm
/* arch/arm/mach-omap1/include/mach/debug-macro.S
|
|
*
|
|
* Debugging macro include header
|
|
*
|
|
* Copyright (C) 1994-1999 Russell King
|
|
* Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/serial_reg.h>
|
|
|
|
#include "serial.h"
|
|
|
|
.pushsection .data
|
|
omap_uart_phys: .word 0x0
|
|
omap_uart_virt: .word 0x0
|
|
.popsection
|
|
|
|
/*
|
|
* Note that this code won't work if the bootloader passes
|
|
* a wrong machine ID number in r1. To debug, just hardcode
|
|
* the desired UART phys and virt addresses temporarily into
|
|
* the omap_uart_phys and omap_uart_virt above.
|
|
*/
|
|
.macro addruart, rp, rv, tmp
|
|
|
|
/* Use omap_uart_phys/virt if already configured */
|
|
9: adr \rp, 99f @ get effective addr of 99f
|
|
ldr \rv, [\rp] @ get absolute addr of 99f
|
|
sub \rv, \rv, \rp @ offset between the two
|
|
ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys
|
|
sub \tmp, \rp, \rv @ make it effective
|
|
ldr \rp, [\tmp, #0] @ omap_uart_phys
|
|
ldr \rv, [\tmp, #4] @ omap_uart_virt
|
|
cmp \rp, #0 @ is port configured?
|
|
cmpne \rv, #0
|
|
bne 100f @ already configured
|
|
|
|
/* Check the debug UART configuration set in uncompress.h */
|
|
and \rp, pc, #0xff000000
|
|
ldr \rv, =OMAP_UART_INFO_OFS
|
|
ldr \rp, [\rp, \rv]
|
|
|
|
/* Select the UART to use based on the UART1 scratchpad value */
|
|
10: cmp \rp, #0 @ no port configured?
|
|
beq 11f @ if none, try to use UART1
|
|
cmp \rp, #OMAP1UART1
|
|
beq 11f @ configure OMAP1UART1
|
|
cmp \rp, #OMAP1UART2
|
|
beq 12f @ configure OMAP1UART2
|
|
cmp \rp, #OMAP1UART3
|
|
beq 13f @ configure OMAP2UART3
|
|
|
|
/* Configure the UART offset from the phys/virt base */
|
|
11: mov \rp, #0x00fb0000 @ OMAP1UART1
|
|
b 98f
|
|
12: mov \rp, #0x00fb0000 @ OMAP1UART1
|
|
orr \rp, \rp, #0x00000800 @ OMAP1UART2
|
|
b 98f
|
|
13: mov \rp, #0x00fb0000 @ OMAP1UART1
|
|
orr \rp, \rp, #0x00000800 @ OMAP1UART2
|
|
orr \rp, \rp, #0x00009000 @ OMAP1UART3
|
|
|
|
/* Store both phys and virt address for the uart */
|
|
98: add \rp, \rp, #0xff000000 @ phys base
|
|
str \rp, [\tmp, #0] @ omap_uart_phys
|
|
sub \rp, \rp, #0xff000000 @ phys base
|
|
add \rp, \rp, #0xfe000000 @ virt base
|
|
str \rp, [\tmp, #4] @ omap_uart_virt
|
|
b 9b
|
|
|
|
.align
|
|
99: .word .
|
|
.word omap_uart_phys
|
|
.ltorg
|
|
|
|
100:
|
|
.endm
|
|
|
|
.macro senduart,rd,rx
|
|
strb \rd, [\rx]
|
|
.endm
|
|
|
|
.macro busyuart,rd,rx
|
|
1001: ldrb \rd, [\rx, #(UART_LSR << OMAP_PORT_SHIFT)]
|
|
and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
|
|
teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
|
|
beq 1002f
|
|
ldrb \rd, [\rx, #(UART_LSR << OMAP7XX_PORT_SHIFT)]
|
|
and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
|
|
teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
|
|
bne 1001b
|
|
1002:
|
|
.endm
|
|
|
|
.macro waituart,rd,rx
|
|
.endm
|