mirror of https://gitee.com/openkylin/linux.git
105 lines
2.9 KiB
ArmAsm
105 lines
2.9 KiB
ArmAsm
/* arch/arm/mach-omap1/include/mach/debug-macro.S
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*
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* Debugging macro include header
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*
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* Copyright (C) 1994-1999 Russell King
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* Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/serial_reg.h>
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#include <asm/memory.h>
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#include <plat/serial.h>
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.pushsection .data
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omap_uart_phys: .word 0x0
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omap_uart_virt: .word 0x0
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.popsection
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/*
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* Note that this code won't work if the bootloader passes
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* a wrong machine ID number in r1. To debug, just hardcode
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* the desired UART phys and virt addresses temporarily into
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* the omap_uart_phys and omap_uart_virt above.
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*/
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.macro addruart, rp, rv
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/* Use omap_uart_phys/virt if already configured */
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9: mrc p15, 0, \rp, c1, c0
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tst \rp, #1 @ MMU enabled?
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ldreq \rp, =__virt_to_phys(omap_uart_phys) @ MMU not enabled
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ldrne \rp, =omap_uart_phys @ MMU enabled
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add \rv, \rp, #4 @ omap_uart_virt
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ldr \rp, [\rp, #0]
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ldr \rv, [\rv, #0]
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cmp \rp, #0 @ is port configured?
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cmpne \rv, #0
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bne 99f @ already configured
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/* Check the debug UART configuration set in uncompress.h */
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mrc p15, 0, \rp, c1, c0
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tst \rp, #1 @ MMU enabled?
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ldreq \rp, =OMAP_UART_INFO @ MMU not enabled
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ldrne \rp, =__phys_to_virt(OMAP_UART_INFO) @ MMU enabled
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ldr \rp, [\rp, #0]
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/* Select the UART to use based on the UART1 scratchpad value */
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10: cmp \rp, #0 @ no port configured?
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beq 11f @ if none, try to use UART1
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cmp \rp, #OMAP1UART1
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beq 11f @ configure OMAP1UART1
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cmp \rp, #OMAP1UART2
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beq 12f @ configure OMAP1UART2
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cmp \rp, #OMAP1UART3
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beq 13f @ configure OMAP2UART3
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/* Configure the UART offset from the phys/virt base */
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11: mov \rp, #0x00fb0000 @ OMAP1UART1
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b 98f
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12: mov \rp, #0x00fb0000 @ OMAP1UART1
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orr \rp, \rp, #0x00000800 @ OMAP1UART2
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b 98f
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13: mov \rp, #0x00fb0000 @ OMAP1UART1
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orr \rp, \rp, #0x00000800 @ OMAP1UART2
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orr \rp, \rp, #0x00009000 @ OMAP1UART3
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/* Store both phys and virt address for the uart */
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98: add \rp, \rp, #0xff000000 @ phys base
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mrc p15, 0, \rv, c1, c0
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tst \rv, #1 @ MMU enabled?
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ldreq \rv, =__virt_to_phys(omap_uart_phys) @ MMU not enabled
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ldrne \rv, =omap_uart_phys @ MMU enabled
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str \rp, [\rv, #0]
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sub \rp, \rp, #0xff000000 @ phys base
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add \rp, \rp, #0xfe000000 @ virt base
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add \rv, \rv, #4 @ omap_uart_lsr
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str \rp, [\rv, #0]
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b 9b
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99:
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.endm
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.macro senduart,rd,rx
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strb \rd, [\rx]
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.endm
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.macro busyuart,rd,rx
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1001: ldrb \rd, [\rx, #(UART_LSR << OMAP_PORT_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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beq 1002f
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ldrb \rd, [\rx, #(UART_LSR << OMAP7XX_PORT_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 1001b
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1002:
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.endm
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.macro waituart,rd,rx
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.endm
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