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82 lines
2.0 KiB
82 lines
2.0 KiB
/* 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 waituartcts,rd,rx |
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.endm |
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.macro waituarttxrdy,rd,rx |
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.endm
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