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/* 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
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