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annotate gsm-fw/lldbg/serio.S @ 992:a7b0b426f9ca

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target-utils: boot ROM UART autodetection revamped The new implementation should work with both the familiar Calypso C035 boot ROM version found in our regular targets as well as the older Calypso F741979B version found on the vintage D-Sample board.
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Wed, 30 Dec 2015 21:28:41 +0000
parents f5affe83ba2d
children
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865
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1 #include "../include/config.h"
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2 #include "ns16550.h"
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3
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4 /* this module implements the elementary serial I/O operations */
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5
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6 .text
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7 .code 32
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8 .globl lldbg_serial_out
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9 lldbg_serial_out:
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10 ldr r2, =CONFIG_LLDBG_UART_BASE
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11 1: ldrb r3, [r2, #NS16550_LSR]
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12 tst r3, #NS16550_LSR_THRE
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13 beq 1b
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14 strb r0, [r2, #NS16550_THR]
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15 bx lr
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16
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17 .globl lldbg_serial_in_poll
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18 lldbg_serial_in_poll:
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19 ldr r2, =CONFIG_LLDBG_UART_BASE
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20 ldrb r3, [r2, #NS16550_LSR]
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21 tst r3, #NS16550_LSR_DR
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22 ldrneb r0, [r2, #NS16550_RBR]
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23 mvneq r0, #0
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24 bx lr
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25
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26 #if 0 // not needed currently
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27 .globl lldbg_serial_flush
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28 lldbg_serial_flush:
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29 ldr r2, =CONFIG_LLDBG_UART_BASE
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30 1: ldrb r3, [r2, #NS16550_LSR]
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31 tst r3, #NS16550_LSR_TEMP
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32 beq 1b
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33 bx lr
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34 #endif