1/* arch/arm/mach-omap2/include/mach/debug-macro.S
  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 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License version 2 as
 10 * published by the Free Software Foundation.
 11 *
 12*/
 13
 14#include <linux/serial_reg.h>
 15
 16#include <plat/serial.h>
 17
 18#define UART_OFFSET(addr)	((addr) & 0x00ffffff)
 19
 20		.pushsection .data
 21omap_uart_phys:	.word	0
 22omap_uart_virt:	.word	0
 23omap_uart_lsr:	.word	0
 24		.popsection
 25
 26		/*
 27		 * Note that this code won't work if the bootloader passes
 28		 * a wrong machine ID number in r1. To debug, just hardcode
 29		 * the desired UART phys and virt addresses temporarily into
 30		 * the omap_uart_phys and omap_uart_virt above.
 31		 */
 32		.macro	addruart, rp, rv, tmp
 33
 34		/* Use omap_uart_phys/virt if already configured */
 3510:		adr	\rp, 99f		@ get effective addr of 99f
 36		ldr	\rv, [\rp]		@ get absolute addr of 99f
 37		sub	\rv, \rv, \rp		@ offset between the two
 38		ldr	\rp, [\rp, #4]		@ abs addr of omap_uart_phys
 39		sub	\tmp, \rp, \rv		@ make it effective
 40		ldr	\rp, [\tmp, #0]		@ omap_uart_phys
 41		ldr	\rv, [\tmp, #4]		@ omap_uart_virt
 42		cmp	\rp, #0			@ is port configured?
 43		cmpne	\rv, #0
 44		bne	100f			@ already configured
 45
 46		/* Check the debug UART configuration set in uncompress.h */
 47		mov	\rp, pc
 48		ldr	\rv, =OMAP_UART_INFO_OFS
 49		and	\rp, \rp, #0xff000000
 50		ldr	\rp, [\rp, \rv]
 51
 52		/* Select the UART to use based on the UART1 scratchpad value */
 53		cmp	\rp, #0			@ no port configured?
 54		beq	21f			@ if none, try to use UART1
 55		cmp	\rp, #OMAP2UART1	@ OMAP2/3/4UART1
 56		beq	21f			@ configure OMAP2/3/4UART1
 57		cmp	\rp, #OMAP2UART2	@ OMAP2/3/4UART2
 58		beq	22f			@ configure OMAP2/3/4UART2
 59		cmp	\rp, #OMAP2UART3	@ only on 24xx
 60		beq	23f			@ configure OMAP2UART3
 61		cmp	\rp, #OMAP3UART3	@ only on 34xx
 62		beq	33f			@ configure OMAP3UART3
 63		cmp	\rp, #OMAP4UART3	@ only on 44xx
 64		beq	43f			@ configure OMAP4UART3
 65		cmp	\rp, #OMAP3UART4	@ only on 36xx
 66		beq	34f			@ configure OMAP3UART4
 67		cmp	\rp, #OMAP4UART4	@ only on 44xx
 68		beq	44f			@ configure OMAP4UART4
 69		cmp	\rp, #TI81XXUART1	@ ti81Xx UART offsets different
 70		beq	81f			@ configure UART1
 71		cmp	\rp, #TI81XXUART2	@ ti81Xx UART offsets different
 72		beq	82f			@ configure UART2
 73		cmp	\rp, #TI81XXUART3	@ ti81Xx UART offsets different
 74		beq	83f			@ configure UART3
 75		cmp	\rp, #ZOOM_UART		@ only on zoom2/3
 76		beq	95f			@ configure ZOOM_UART
 77
 78		/* Configure the UART offset from the phys/virt base */
 7921:		mov	\rp, #UART_OFFSET(OMAP2_UART1_BASE)	@ omap2/3/4
 80		b	98f
 8122:		mov	\rp, #UART_OFFSET(OMAP2_UART2_BASE)	@ omap2/3/4
 82		b	98f
 8323:		mov	\rp, #UART_OFFSET(OMAP2_UART3_BASE)
 84		b	98f
 8533:		mov	\rp, #UART_OFFSET(OMAP3_UART1_BASE)
 86		add	\rp, \rp, #0x00fb0000
 87		add	\rp, \rp, #0x00006000		@ OMAP3_UART3_BASE
 88		b	98f
 8934:		mov	\rp, #UART_OFFSET(OMAP3_UART1_BASE)
 90		add	\rp, \rp, #0x00fb0000
 91		add	\rp, \rp, #0x00028000		@ OMAP3_UART4_BASE
 92		b	98f
 9343:		mov	\rp, #UART_OFFSET(OMAP4_UART3_BASE)
 94		b	98f
 9544:		mov	\rp, #UART_OFFSET(OMAP4_UART4_BASE)
 96		b	98f
 9781:		mov	\rp, #UART_OFFSET(TI81XX_UART1_BASE)
 98		b	98f
 9982:		mov	\rp, #UART_OFFSET(TI81XX_UART2_BASE)
100		b	98f
10183:		mov	\rp, #UART_OFFSET(TI81XX_UART3_BASE)
102		b	98f
103
10495:		ldr	\rp, =ZOOM_UART_BASE
105		str	\rp, [\tmp, #0]		@ omap_uart_phys
106		ldr	\rp, =ZOOM_UART_VIRT
107		str	\rp, [\tmp, #4]		@ omap_uart_virt
108		mov	\rp, #(UART_LSR << ZOOM_PORT_SHIFT)
109		str	\rp, [\tmp, #8]		@ omap_uart_lsr
110		b	10b
111
112		/* Store both phys and virt address for the uart */
11398:		add	\rp, \rp, #0x48000000	@ phys base
114		str	\rp, [\tmp, #0]		@ omap_uart_phys
115		sub	\rp, \rp, #0x48000000	@ phys base
116		add	\rp, \rp, #0xfa000000	@ virt base
117		str	\rp, [\tmp, #4]		@ omap_uart_virt
118		mov	\rp, #(UART_LSR << OMAP_PORT_SHIFT)
119		str	\rp, [\tmp, #8]		@ omap_uart_lsr
120
121		b	10b
122
123		.align
12499:		.word	.
125		.word	omap_uart_phys
126		.ltorg
127
128100:		/* Pass the UART_LSR reg address */
129		ldr	\tmp, [\tmp, #8]	@ omap_uart_lsr
130		add	\rp, \rp, \tmp
131		add	\rv, \rv, \tmp
132		.endm
133
134		.macro	senduart,rd,rx
135		orr	\rd, \rd, \rx, lsl #24	@ preserve LSR reg offset
136		bic	\rx, \rx, #0xff		@ get base (THR) reg address
137		strb	\rd, [\rx]		@ send lower byte of rd
138		orr	\rx, \rx, \rd, lsr #24	@ restore original rx (LSR)
139		bic	\rd, \rd, #(0xff << 24)	@ restore original rd
140		.endm
141
142		.macro	busyuart,rd,rx
1431001:		ldrb	\rd, [\rx]		@ rx contains UART_LSR address
144		and	\rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
145		teq	\rd, #(UART_LSR_TEMT | UART_LSR_THRE)
146		bne	1001b
147		.endm
148
149		.macro	waituart,rd,rx
150		.endm