forked from Minki/linux
4d887a250d
This patch adds support for low level debugging on TI816X boards. Currently the support for UART3 console on TI816X EVM is added. Signed-off-by: Hemant Pedanekar <hemantp@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
157 lines
4.6 KiB
ArmAsm
157 lines
4.6 KiB
ArmAsm
/* arch/arm/mach-omap2/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 <asm/memory.h>
|
|
|
|
#include <plat/serial.h>
|
|
|
|
#define UART_OFFSET(addr) ((addr) & 0x00ffffff)
|
|
|
|
.pushsection .data
|
|
omap_uart_phys: .word 0
|
|
omap_uart_virt: .word 0
|
|
omap_uart_lsr: .word 0
|
|
.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
|
|
|
|
/* Use omap_uart_phys/virt if already configured */
|
|
10: mrc p15, 0, \rp, c1, c0
|
|
tst \rp, #1 @ MMU enabled?
|
|
ldreq \rp, =__virt_to_phys(omap_uart_phys) @ MMU not enabled
|
|
ldrne \rp, =omap_uart_phys @ MMU enabled
|
|
add \rv, \rp, #4 @ omap_uart_virt
|
|
ldr \rp, [\rp, #0]
|
|
ldr \rv, [\rv, #0]
|
|
cmp \rp, #0 @ is port configured?
|
|
cmpne \rv, #0
|
|
bne 99f @ already configured
|
|
|
|
/* Check the debug UART configuration set in uncompress.h */
|
|
mrc p15, 0, \rp, c1, c0
|
|
tst \rp, #1 @ MMU enabled?
|
|
ldreq \rp, =OMAP_UART_INFO @ MMU not enabled
|
|
ldrne \rp, =__phys_to_virt(OMAP_UART_INFO) @ MMU enabled
|
|
ldr \rp, [\rp, #0]
|
|
|
|
/* Select the UART to use based on the UART1 scratchpad value */
|
|
cmp \rp, #0 @ no port configured?
|
|
beq 21f @ if none, try to use UART1
|
|
cmp \rp, #OMAP2UART1 @ OMAP2/3/4UART1
|
|
beq 21f @ configure OMAP2/3/4UART1
|
|
cmp \rp, #OMAP2UART2 @ OMAP2/3/4UART2
|
|
beq 22f @ configure OMAP2/3/4UART2
|
|
cmp \rp, #OMAP2UART3 @ only on 24xx
|
|
beq 23f @ configure OMAP2UART3
|
|
cmp \rp, #OMAP3UART3 @ only on 34xx
|
|
beq 33f @ configure OMAP3UART3
|
|
cmp \rp, #OMAP4UART3 @ only on 44xx
|
|
beq 43f @ configure OMAP4UART3
|
|
cmp \rp, #OMAP3UART4 @ only on 36xx
|
|
beq 34f @ configure OMAP3UART4
|
|
cmp \rp, #OMAP4UART4 @ only on 44xx
|
|
beq 44f @ configure OMAP4UART4
|
|
cmp \rp, #TI816XUART1 @ ti816x UART offsets different
|
|
beq 81f @ configure UART1
|
|
cmp \rp, #TI816XUART2 @ ti816x UART offsets different
|
|
beq 82f @ configure UART2
|
|
cmp \rp, #TI816XUART3 @ ti816x UART offsets different
|
|
beq 83f @ configure UART3
|
|
cmp \rp, #ZOOM_UART @ only on zoom2/3
|
|
beq 95f @ configure ZOOM_UART
|
|
|
|
/* Configure the UART offset from the phys/virt base */
|
|
21: mov \rp, #UART_OFFSET(OMAP2_UART1_BASE) @ omap2/3/4
|
|
b 98f
|
|
22: mov \rp, #UART_OFFSET(OMAP2_UART2_BASE) @ omap2/3/4
|
|
b 98f
|
|
23: mov \rp, #UART_OFFSET(OMAP2_UART3_BASE)
|
|
b 98f
|
|
33: mov \rp, #UART_OFFSET(OMAP3_UART1_BASE)
|
|
add \rp, \rp, #0x00fb0000
|
|
add \rp, \rp, #0x00006000 @ OMAP3_UART3_BASE
|
|
b 98f
|
|
34: mov \rp, #UART_OFFSET(OMAP3_UART1_BASE)
|
|
add \rp, \rp, #0x00fb0000
|
|
add \rp, \rp, #0x00028000 @ OMAP3_UART4_BASE
|
|
b 98f
|
|
43: mov \rp, #UART_OFFSET(OMAP4_UART3_BASE)
|
|
b 98f
|
|
44: mov \rp, #UART_OFFSET(OMAP4_UART4_BASE)
|
|
b 98f
|
|
81: mov \rp, #UART_OFFSET(TI816X_UART1_BASE)
|
|
b 98f
|
|
82: mov \rp, #UART_OFFSET(TI816X_UART2_BASE)
|
|
b 98f
|
|
83: mov \rp, #UART_OFFSET(TI816X_UART3_BASE)
|
|
b 98f
|
|
95: ldr \rp, =ZOOM_UART_BASE
|
|
mrc p15, 0, \rv, c1, c0
|
|
tst \rv, #1 @ MMU enabled?
|
|
ldreq \rv, =__virt_to_phys(omap_uart_phys) @ MMU not enabled
|
|
ldrne \rv, =omap_uart_phys @ MMU enabled
|
|
str \rp, [\rv, #0]
|
|
ldr \rp, =ZOOM_UART_VIRT
|
|
add \rv, \rv, #4 @ omap_uart_virt
|
|
str \rp, [\rv, #0]
|
|
mov \rp, #(UART_LSR << ZOOM_PORT_SHIFT)
|
|
add \rv, \rv, #4 @ omap_uart_lsr
|
|
str \rp, [\rv, #0]
|
|
b 10b
|
|
|
|
/* Store both phys and virt address for the uart */
|
|
98: add \rp, \rp, #0x48000000 @ phys base
|
|
mrc p15, 0, \rv, c1, c0
|
|
tst \rv, #1 @ MMU enabled?
|
|
ldreq \rv, =__virt_to_phys(omap_uart_phys) @ MMU not enabled
|
|
ldrne \rv, =omap_uart_phys @ MMU enabled
|
|
str \rp, [\rv, #0]
|
|
sub \rp, \rp, #0x48000000 @ phys base
|
|
add \rp, \rp, #0xfa000000 @ virt base
|
|
add \rv, \rv, #4 @ omap_uart_virt
|
|
str \rp, [\rv, #0]
|
|
mov \rp, #(UART_LSR << OMAP_PORT_SHIFT)
|
|
add \rv, \rv, #4 @ omap_uart_lsr
|
|
str \rp, [\rv, #0]
|
|
|
|
b 10b
|
|
99:
|
|
.endm
|
|
|
|
.macro senduart,rd,rx
|
|
strb \rd, [\rx]
|
|
.endm
|
|
|
|
.macro busyuart,rd,rx
|
|
1001: mrc p15, 0, \rd, c1, c0
|
|
tst \rd, #1 @ MMU enabled?
|
|
ldreq \rd, =__virt_to_phys(omap_uart_lsr) @ MMU not enabled
|
|
ldrne \rd, =omap_uart_lsr @ MMU enabled
|
|
ldr \rd, [\rd, #0]
|
|
ldrb \rd, [\rx, \rd]
|
|
and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
|
|
teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
|
|
bne 1001b
|
|
.endm
|
|
|
|
.macro waituart,rd,rx
|
|
.endm
|