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