summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/include/mach/debug-macro.S
blob: 4a63a2ea484dd58681a3f403f926a64861e023a9 (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
/* 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, rx, tmp

		/* Use omap_uart_phys/virt if already configured */
10:		mrc	p15, 0, \rx, c1, c0
		tst	\rx, #1			@ MMU enabled?
		ldreq	\rx, =omap_uart_phys	@ physical base address
		ldrne	\rx, =omap_uart_virt	@ virtual base address
		ldr	\rx, [\rx, #0]
		cmp	\rx, #0			@ is port configured?
		bne	99f			@ already configured

		/* Check UART1 scratchpad register for uart to use */
		mrc	p15, 0, \rx, c1, c0
		tst	\rx, #1			@ MMU enabled?
		moveq	\rx, #0x48000000	@ physical base address
		movne	\rx, #0xfa000000	@ virtual base
		orr	\rx, \rx, #0x0006a000	@ uart1 on omap2/3/4
		ldrb	\rx, [\rx, #(UART_SCR << OMAP_PORT_SHIFT)] @ scratchpad

		/* Select the UART to use based on the UART1 scratchpad value */
		cmp	\rx, #0			@ no port configured?
		beq	21f			@ if none, try to use UART1
		cmp	\rx, #OMAP2UART1	@ OMAP2/3/4UART1
		beq	21f			@ configure OMAP2/3/4UART1
		cmp	\rx, #OMAP2UART2	@ OMAP2/3/4UART2
		beq	22f			@ configure OMAP2/3/4UART2
		cmp	\rx, #OMAP2UART3	@ only on 24xx
		beq	23f			@ configure OMAP2UART3
		cmp	\rx, #OMAP3UART3	@ only on 34xx
		beq	33f			@ configure OMAP3UART3
		cmp	\rx, #OMAP4UART3	@ only on 44xx
		beq	43f			@ configure OMAP4UART3
		cmp	\rx, #OMAP3UART4	@ only on 36xx
		beq	34f			@ configure OMAP3UART4
		cmp	\rx, #OMAP4UART4	@ only on 44xx
		beq	44f			@ configure OMAP4UART4
		cmp	\rx, #ZOOM_UART		@ only on zoom2/3
		beq	95f			@ configure ZOOM_UART

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

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

		b	10b
99:
		.endm

		.macro	senduart,rd,rx
		strb	\rd, [\rx]
		.endm

		.macro	busyuart,rd,rx
1001:		ldr	\rd, =omap_uart_lsr
		ldr	\rd, [\rd, #0]
		ldrb	\rd, [\rx, \rd]
		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
OpenPOWER on IntegriCloud