forked from Minki/linux
28362d5153
This achieves two goals: 1) Get rid of omap_uart_v2p() and omap_uart_p2v() which were the last users of PLAT_PHYS_OFFSET. 2) Remove the probing of the M bit in the CP15 control reg and make the access to the .data variables completely position independent. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Tested-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Kevin Hilman <khilman@ti.com>
102 lines
2.8 KiB
ArmAsm
102 lines
2.8 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 <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, tmp
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/* Use omap_uart_phys/virt if already configured */
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9: 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] @ omap_uart_phys
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ldr \rv, [\tmp, #4] @ omap_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 configuration set in uncompress.h */
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and \rp, pc, #0xff000000
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ldr \rv, =OMAP_UART_INFO_OFS
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ldr \rp, [\rp, \rv]
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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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str \rp, [\tmp, #0] @ omap_uart_phys
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sub \rp, \rp, #0xff000000 @ phys base
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add \rp, \rp, #0xfe000000 @ virt base
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str \rp, [\tmp, #4] @ omap_uart_virt
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b 9b
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.align
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99: .word .
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.word omap_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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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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