summaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap2/include/mach/debug-macro.S
blob: 93d10de7129fc550bea299921a3a0f3a62239630 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
/* arch/arm/mach-omap2/include/mach/debug-macro.S
 *
 * Debugging macro include header
 *
 *  Copyright (C) 1994-1999 Russell King
 *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
*/

#include <linux/serial_reg.h>

#include <plat/serial.h>

#define UART_OFFSET(addr)	((addr) & 0x00ffffff)

		.pushsection .data
omap_uart_phys:	.word	0
omap_uart_virt:	.word	0
omap_uart_lsr:	.word	0
		.popsection

		/*
		 * Note that this code won't work if the bootloader passes
		 * a wrong machine ID number in r1. To debug, just hardcode
		 * the desired UART phys and virt addresses temporarily into
		 * the omap_uart_phys and omap_uart_virt above.
		 */
		.macro	addruart, rp, rv, tmp

		/* Use omap_uart_phys/virt if already configured */
10:		adr	\rp, 99f		@ get effective addr of 99f
		ldr	\rv, [\rp]		@ get absolute addr of 99f
		sub	\rv, \rv, \rp		@ offset between the two
		ldr	\rp, [\rp, #4]		@ abs addr of omap_uart_phys
		sub	\tmp, \rp, \rv		@ make it effective
		ldr	\rp, [\tmp, #0]		@ omap_uart_phys
		ldr	\rv, [\tmp, #4]		@ omap_uart_virt
		cmp	\rp, #0			@ is port configured?
		cmpne	\rv, #0
		bne	100f			@ already configured

		/* Check the debug UART configuration set in uncompress.h */
		mov	\rp, pc
		ldr	\rv, =OMAP_UART_INFO_OFS
		and	\rp, \rp, #0xff000000
		ldr	\rp, [\rp, \rv]

		/* Select the UART to use based on the UART1 scratchpad value */
		cmp	\rp, #0			@ no port configured?
		beq	21f			@ if none, try to use UART1
		cmp	\rp, #OMAP2UART1	@ OMAP2/3/4UART1
		beq	21f			@ configure OMAP2/3/4UART1
		cmp	\rp, #OMAP2UART2	@ OMAP2/3/4UART2
		beq	22f			@ configure OMAP2/3/4UART2
		cmp	\rp, #OMAP2UART3	@ only on 24xx
		beq	23f			@ configure OMAP2UART3
		cmp	\rp, #OMAP3UART3	@ only on 34xx
		beq	33f			@ configure OMAP3UART3
		cmp	\rp, #OMAP4UART3	@ only on 44xx/54xx
		beq	43f			@ configure OMAP4/5UART3
		cmp	\rp, #OMAP3UART4	@ only on 36xx
		beq	34f			@ configure OMAP3UART4
		cmp	\rp, #OMAP4UART4	@ only on 44xx/54xx
		beq	44f			@ configure OMAP4/5UART4
		cmp	\rp, #TI81XXUART1	@ ti81Xx UART offsets different
		beq	81f			@ configure UART1
		cmp	\rp, #TI81XXUART2	@ ti81Xx UART offsets different
		beq	82f			@ configure UART2
		cmp	\rp, #TI81XXUART3	@ ti81Xx UART offsets different
		beq	83f			@ configure UART3
		cmp	\rp, #AM33XXUART1	@ AM33XX UART offsets different
		beq	84f			@ configure UART1
		cmp	\rp, #ZOOM_UART		@ only on zoom2/3
		beq	95f			@ configure ZOOM_UART

		/* Configure the UART offset from the phys/virt base */
21:		mov	\rp, #UART_OFFSET(OMAP2_UART1_BASE)	@ omap2/3/4
		b	98f
22:		mov	\rp, #UART_OFFSET(OMAP2_UART2_BASE)	@ omap2/3/4
		b	98f
23:		mov	\rp, #UART_OFFSET(OMAP2_UART3_BASE)
		b	98f
33:		mov	\rp, #UART_OFFSET(OMAP3_UART1_BASE)
		add	\rp, \rp, #0x00fb0000
		add	\rp, \rp, #0x00006000		@ OMAP3_UART3_BASE
		b	98f
34:		mov	\rp, #UART_OFFSET(OMAP3_UART1_BASE)
		add	\rp, \rp, #0x00fb0000
		add	\rp, \rp, #0x00028000		@ OMAP3_UART4_BASE
		b	98f
43:		mov	\rp, #UART_OFFSET(OMAP4_UART3_BASE)
		b	98f
44:		mov	\rp, #UART_OFFSET(OMAP4_UART4_BASE)
		b	98f
81:		mov	\rp, #UART_OFFSET(TI81XX_UART1_BASE)
		b	98f
82:		mov	\rp, #UART_OFFSET(TI81XX_UART2_BASE)
		b	98f
83:		mov	\rp, #UART_OFFSET(TI81XX_UART3_BASE)
		b	98f
84:		ldr	\rp, =AM33XX_UART1_BASE
		and	\rp, \rp, #0x00ffffff
		b	97f
95:		ldr	\rp, =ZOOM_UART_BASE
		str	\rp, [\tmp, #0]		@ omap_uart_phys
		ldr	\rp, =ZOOM_UART_VIRT
		str	\rp, [\tmp, #4]		@ omap_uart_virt
		mov	\rp, #(UART_LSR << ZOOM_PORT_SHIFT)
		str	\rp, [\tmp, #8]		@ omap_uart_lsr
		b	10b

		/* AM33XX: Store both phys and virt address for the uart */
97:		add	\rp, \rp, #0x44000000	@ phys base
		str	\rp, [\tmp, #0]		@ omap_uart_phys
		sub	\rp, \rp, #0x44000000	@ phys base
		add	\rp, \rp, #0xf9000000	@ virt base
		str	\rp, [\tmp, #4]		@ omap_uart_virt
		mov	\rp, #(UART_LSR << OMAP_PORT_SHIFT)
		str	\rp, [\tmp, #8]		@ omap_uart_lsr

		b	10b

		/* Store both phys and virt address for the uart */
98:		add	\rp, \rp, #0x48000000	@ phys base
		str	\rp, [\tmp, #0]		@ omap_uart_phys
		sub	\rp, \rp, #0x48000000	@ phys base
		add	\rp, \rp, #0xfa000000	@ virt base
		str	\rp, [\tmp, #4]		@ omap_uart_virt
		mov	\rp, #(UART_LSR << OMAP_PORT_SHIFT)
		str	\rp, [\tmp, #8]		@ omap_uart_lsr

		b	10b

		.align
99:		.word	.
		.word	omap_uart_phys
		.ltorg

100:		/* Pass the UART_LSR reg address */
		ldr	\tmp, [\tmp, #8]	@ omap_uart_lsr
		add	\rp, \rp, \tmp
		add	\rv, \rv, \tmp
		.endm

		.macro	senduart,rd,rx
		orr	\rd, \rd, \rx, lsl #24	@ preserve LSR reg offset
		bic	\rx, \rx, #0xff		@ get base (THR) reg address
		strb	\rd, [\rx]		@ send lower byte of rd
		orr	\rx, \rx, \rd, lsr #24	@ restore original rx (LSR)
		bic	\rd, \rd, #(0xff << 24)	@ restore original rd
		.endm

		.macro	busyuart,rd,rx
1001:		ldrb	\rd, [\rx]		@ rx contains UART_LSR address
		and	\rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
		teq	\rd, #(UART_LSR_TEMT | UART_LSR_THRE)
		bne	1001b
		.endm

		.macro	waituart,rd,rx
		.endm