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omap2plus.S
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Debugging macro include header * * Copyright (C) 1994-1999 Russell King * Moved from linux/arch/arm/kernel/debug.S by Ben Dooks */ #include <linux/serial_reg.h> /* External port on Zoom2/3 */ #define ZOOM_UART_BASE 0x10000000 #define ZOOM_UART_VIRT 0xfa400000 #define OMAP_PORT_SHIFT 2 #define ZOOM_PORT_SHIFT 1 #define UART_OFFSET(addr) ((addr) & 0x00ffffff) .pushsection .data .align 2 omap_uart_phys: .word 0 omap_uart_virt: .word 0 omap_uart_lsr: .word 0 .popsection .macro addruart, rp, rv, tmp /* Use omap_uart_phys/virt if already configured */ 10: adr \rp, 99f @ get effective addr of 99f ldr \rv, [\rp] @ get absolute addr of 99f sub \rv, \rv, \rp @ offset between the two ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys sub \tmp, \rp, \rv @ make it effective ldr \rp, [\tmp, #0] @ omap_uart_phys ldr \rv, [\tmp, #4] @ omap_uart_virt cmp \rp, #0 @ is port configured? cmpne \rv, #0 bne 100f @ already configured /* Configure the UART offset from the phys/virt base */ #ifdef CONFIG_DEBUG_ZOOM_UART ldr \rp, =ZOOM_UART_BASE str \rp, [\tmp, #0] @ omap_uart_phys ldr \rp, =ZOOM_UART_VIRT str \rp, [\tmp, #4] @ omap_uart_virt mov \rp, #(UART_LSR << ZOOM_PORT_SHIFT) str \rp, [\tmp, #8] @ omap_uart_lsr #endif b 10b .align 99: .word . .word omap_uart_phys .ltorg 100: /* Pass the UART_LSR reg address */ ldr \tmp, [\tmp, #8] @ omap_uart_lsr add \rp, \rp, \tmp add \rv, \rv, \tmp .endm .macro senduart,rd,rx orr \rd, \rd, \rx, lsl #24 @ preserve LSR reg offset bic \rx, \rx, #0xff @ get base (THR) reg address strb \rd, [\rx] @ send lower byte of rd orr \rx, \rx, \rd, lsr #24 @ restore original rx (LSR) bic \rd, \rd, #(0xff << 24) @ restore original rd .endm .macro busyuart,rd,rx 1001: ldrb \rd, [\rx] @ rx contains UART_LSR address and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE) teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE) bne 1001b .endm .macro waituartcts,rd,rx .endm .macro waituarttxrdy,rd,rx .endm
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