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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/mach-davinci/include/mach/debug-macro.S
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/*

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 * Debugging macro for DaVinci

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 *

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 * Author: Kevin Hilman, MontaVista Software, Inc. <[email protected]>

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 *

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 * 2007 (c) MontaVista Software, Inc. This file is licensed under

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 * the terms of the GNU General Public License version 2. This program

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 * is licensed "as is" without any warranty of any kind, whether express

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 * or implied.

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 */

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/* Modifications

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 * Jan 2009	Chaithrika U S	Added senduart, busyuart, waituart

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 *				macros, based on debug-8250.S file

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 *				but using 32-bit accesses required for

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 *                              some davinci devices.

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 */

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#include <linux/serial_reg.h>

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#include <asm/memory.h>

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#include <mach/serial.h>

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#define UART_SHIFT	2

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#define davinci_uart_v2p(x)	((x) - PAGE_OFFSET + PLAT_PHYS_OFFSET)

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#define davinci_uart_p2v(x)	((x) - PLAT_PHYS_OFFSET + PAGE_OFFSET)

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		.pushsection .data

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davinci_uart_phys:	.word	0

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davinci_uart_virt:	.word	0

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		.popsection

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		.macro addruart, rp, rv

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		/* Use davinci_uart_phys/virt if already configured */

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10:		mrc	p15, 0, \rp, c1, c0

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		tst	\rp, #1			@ MMU enabled?

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		ldreq	\rp, =davinci_uart_v2p(davinci_uart_phys)

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		ldrne	\rp, =davinci_uart_phys

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		add	\rv, \rp, #4		@ davinci_uart_virt

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		ldr	\rp, [\rp, #0]

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		ldr	\rv, [\rv, #0]

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		cmp	\rp, #0			@ is port configured?

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		cmpne	\rv, #0

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		bne	99f			@ already configured

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		/* Check the debug UART address set in uncompress.h */

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		mrc	p15, 0, \rp, c1, c0

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		tst	\rp, #1			@ MMU enabled?

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		/* Copy uart phys address from decompressor uart info */

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		ldreq	\rv, =davinci_uart_v2p(davinci_uart_phys)

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		ldrne	\rv, =davinci_uart_phys

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		ldreq	\rp, =DAVINCI_UART_INFO

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		ldrne	\rp, =davinci_uart_p2v(DAVINCI_UART_INFO)

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		ldr	\rp, [\rp, #0]

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		str	\rp, [\rv]

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		/* Copy uart virt address from decompressor uart info */

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		ldreq	\rv, =davinci_uart_v2p(davinci_uart_virt)

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		ldrne	\rv, =davinci_uart_virt

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		ldreq	\rp, =DAVINCI_UART_INFO

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		ldrne	\rp, =davinci_uart_p2v(DAVINCI_UART_INFO)

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		ldr	\rp, [\rp, #4]

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		str	\rp, [\rv]

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		b	10b

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99:

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		.endm

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		.macro	senduart,rd,rx

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		str	\rd, [\rx, #UART_TX << UART_SHIFT]

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		.endm

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		.macro	busyuart,rd,rx

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1002:		ldr	\rd, [\rx, #UART_LSR << UART_SHIFT]

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		and	\rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE

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		teq	\rd, #UART_LSR_TEMT | UART_LSR_THRE

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		bne	1002b

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		.endm

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		.macro	waituart,rd,rx

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#ifdef FLOW_CONTROL

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1001:		ldr	\rd, [\rx, #UART_MSR << UART_SHIFT]

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		tst	\rd, #UART_MSR_CTS

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		beq	1001b

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#endif

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		.endm

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