80 lines
2.0 KiB
ArmAsm
80 lines
2.0 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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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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#include <linux/serial_reg.h>
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/* External port on Zoom2/3 */
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#define ZOOM_UART_BASE 0x10000000
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#define ZOOM_UART_VIRT 0xfa400000
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#define OMAP_PORT_SHIFT 2
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#define ZOOM_PORT_SHIFT 1
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#define UART_OFFSET(addr) ((addr) & 0x00ffffff)
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.pushsection .data
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.align 2
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omap_uart_phys: .word 0
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omap_uart_virt: .word 0
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omap_uart_lsr: .word 0
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.popsection
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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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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] @ 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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/* Configure the UART offset from the phys/virt base */
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#ifdef CONFIG_DEBUG_ZOOM_UART
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ldr \rp, =ZOOM_UART_BASE
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str \rp, [\tmp, #0] @ omap_uart_phys
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ldr \rp, =ZOOM_UART_VIRT
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str \rp, [\tmp, #4] @ omap_uart_virt
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mov \rp, #(UART_LSR << ZOOM_PORT_SHIFT)
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str \rp, [\tmp, #8] @ omap_uart_lsr
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#endif
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b 10b
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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: /* Pass the UART_LSR reg address */
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ldr \tmp, [\tmp, #8] @ omap_uart_lsr
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add \rp, \rp, \tmp
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add \rv, \rv, \tmp
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.endm
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.macro senduart,rd,rx
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orr \rd, \rd, \rx, lsl #24 @ preserve LSR reg offset
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bic \rx, \rx, #0xff @ get base (THR) reg address
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strb \rd, [\rx] @ send lower byte of rd
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orr \rx, \rx, \rd, lsr #24 @ restore original rx (LSR)
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bic \rd, \rd, #(0xff << 24) @ restore original rd
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.endm
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.macro busyuart,rd,rx
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1001: ldrb \rd, [\rx] @ rx contains UART_LSR address
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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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.endm
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.macro waituart,rd,rx
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.endm
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