cfdb7d564c
Add choice for low-level debug UART. Similar to i.MX6, there is a numeric configuration, valid choices are 0 to 3. Note that the kernel assumes that the boot loader initialized clock properly. Signed-off-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
38 lines
1 KiB
ArmAsm
38 lines
1 KiB
ArmAsm
/*
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* Copyright 2013 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#define VF_UART0_BASE_ADDR 0x40027000
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#define VF_UART1_BASE_ADDR 0x40028000
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#define VF_UART2_BASE_ADDR 0x40029000
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#define VF_UART3_BASE_ADDR 0x4002a000
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#define VF_UART_BASE_ADDR(n) VF_UART##n##_BASE_ADDR
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#define VF_UART_BASE(n) VF_UART_BASE_ADDR(n)
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#define VF_UART_PHYSICAL_BASE VF_UART_BASE(CONFIG_DEBUG_VF_UART_PORT)
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#define VF_UART_VIRTUAL_BASE 0xfe000000
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.macro addruart, rp, rv, tmp
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ldr \rp, =VF_UART_PHYSICAL_BASE @ physical
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and \rv, \rp, #0xffffff @ offset within 16MB section
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add \rv, \rv, #VF_UART_VIRTUAL_BASE
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.endm
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.macro senduart, rd, rx
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strb \rd, [\rx, #0x7] @ Data Register
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.endm
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.macro busyuart, rd, rx
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1001: ldrb \rd, [\rx, #0x4] @ Status Register 1
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tst \rd, #1 << 6 @ TC
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beq 1001b @ wait until transmit done
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.endm
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.macro waituart,rd,rx
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.endm
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