1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Debugging macro include header 4 * 5 * Copyright (C) 1994-1999 Russell King 6 * Moved from linux/arch/arm/kernel/debug.S by Ben Dooks 7 */ 8 9 #include <linux/serial_reg.h> 10 11 /* External port on Zoom2/3 */ 12 #define ZOOM_UART_BASE 0x10000000 13 #define ZOOM_UART_VIRT 0xfa400000 14 15 #define OMAP_PORT_SHIFT 2 16 #define ZOOM_PORT_SHIFT 1 17 18 #define UART_OFFSET(addr) ((addr) & 0x00ffffff) 19 20 .pushsection .data 21 .align 2 22 omap_uart_phys: .word 0 23 omap_uart_virt: .word 0 24 omap_uart_lsr: .word 0 25 .popsection 26 27 .macro addruart, rp, rv, tmp 28 29 /* Use omap_uart_phys/virt if already configured */ 30 10: adr \rp, 99f @ get effective addr of 99f 31 ldr \rv, [\rp] @ get absolute addr of 99f 32 sub \rv, \rv, \rp @ offset between the two 33 ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys 34 sub \tmp, \rp, \rv @ make it effective 35 ldr \rp, [\tmp, #0] @ omap_uart_phys 36 ldr \rv, [\tmp, #4] @ omap_uart_virt 37 cmp \rp, #0 @ is port configured? 38 cmpne \rv, #0 39 bne 100f @ already configured 40 41 /* Configure the UART offset from the phys/virt base */ 42 #ifdef CONFIG_DEBUG_ZOOM_UART 43 ldr \rp, =ZOOM_UART_BASE 44 str \rp, [\tmp, #0] @ omap_uart_phys 45 ldr \rp, =ZOOM_UART_VIRT 46 str \rp, [\tmp, #4] @ omap_uart_virt 47 mov \rp, #(UART_LSR << ZOOM_PORT_SHIFT) 48 str \rp, [\tmp, #8] @ omap_uart_lsr 49 #endif 50 b 10b 51 52 .align 53 99: .word . 54 .word omap_uart_phys 55 .ltorg 56 57 100: /* Pass the UART_LSR reg address */ 58 ldr \tmp, [\tmp, #8] @ omap_uart_lsr 59 add \rp, \rp, \tmp 60 add \rv, \rv, \tmp 61 .endm 62 63 .macro senduart,rd,rx 64 orr \rd, \rd, \rx, lsl #24 @ preserve LSR reg offset 65 bic \rx, \rx, #0xff @ get base (THR) reg address 66 strb \rd, [\rx] @ send lower byte of rd 67 orr \rx, \rx, \rd, lsr #24 @ restore original rx (LSR) 68 bic \rd, \rd, #(0xff << 24) @ restore original rd 69 .endm 70 71 .macro busyuart,rd,rx 72 1001: ldrb \rd, [\rx] @ rx contains UART_LSR address 73 and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE) 74 teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE) 75 bne 1001b 76 .endm 77 78 .macro waituartcts,rd,rx 79 .endm 80 81 .macro waituarttxrdy,rd,rx 82 .endm 83