86 lines
2.0 KiB
ArmAsm
86 lines
2.0 KiB
ArmAsm
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/*
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* Debugging macro for DaVinci
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*
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* Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
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*
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* 2007 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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/* Modifications
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* Jan 2009 Chaithrika U S Added senduart, busyuart, waituart
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* macros, based on debug-8250.S file
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* but using 32-bit accesses required for
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* some davinci devices.
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*/
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#include <linux/serial_reg.h>
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#include <mach/serial.h>
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#define UART_SHIFT 2
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.pushsection .data
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davinci_uart_phys: .word 0
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davinci_uart_virt: .word 0
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.popsection
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.macro addruart, rp, rv, tmp
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/* Use davinci_uart_phys/virt if already configured */
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10: adr \rp, 99f @ get effective addr of 99f
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ldr \rv, [\rp] @ get absolute addr of 99f
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sub \rv, \rv, \rp @ offset between the two
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ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys
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sub \tmp, \rp, \rv @ make it effective
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ldr \rp, [\tmp, #0] @ davinci_uart_phys
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ldr \rv, [\tmp, #4] @ davinci_uart_virt
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cmp \rp, #0 @ is port configured?
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cmpne \rv, #0
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bne 100f @ already configured
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/* Check the debug UART address set in uncompress.h */
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and \rp, pc, #0xff000000
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ldr \rv, =DAVINCI_UART_INFO_OFS
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add \rp, \rp, \rv
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/* Copy uart phys address from decompressor uart info */
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ldr \rv, [\rp, #0]
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str \rv, [\tmp, #0]
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/* Copy uart virt address from decompressor uart info */
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ldr \rv, [\rp, #4]
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str \rv, [\tmp, #4]
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b 10b
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.align
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99: .word .
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.word davinci_uart_phys
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.ltorg
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100:
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.endm
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.macro senduart,rd,rx
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str \rd, [\rx, #UART_TX << UART_SHIFT]
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.endm
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.macro busyuart,rd,rx
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1002: ldr \rd, [\rx, #UART_LSR << UART_SHIFT]
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and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
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teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
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bne 1002b
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.endm
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.macro waituart,rd,rx
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#ifdef FLOW_CONTROL
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1001: ldr \rd, [\rx, #UART_MSR << UART_SHIFT]
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tst \rd, #UART_MSR_CTS
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beq 1001b
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#endif
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.endm
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