xref: /openbmc/u-boot/board/mpr2/lowlevel_init.S (revision 93322749) 
1/*
2 * (C) Copyright 2008
3 * Mark Jonas <mark.jonas@de.bosch.com>
4 *
5 * (C) Copyright 2007
6 * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
7 *
8 * board/mpr2/lowlevel_init.S
9 *
10 * SPDX-License-Identifier:	GPL-2.0+
11 */
12#include <asm/macro.h>
13
14	.global	lowlevel_init
15
16	.text
17	.align	2
18
19lowlevel_init:
20
21/*
22 * Set frequency multipliers and dividers in FRQCR.
23 */
24	write16	WTCSR_A, WTCSR_D
25
26	write16	WTCNT_A, WTCNT_D
27
28	write16	FRQCR_A, FRQCR_D
29
30/*
31 * Setup CS0 (Flash).
32 */
33	write32	CS0BCR_A, CS0BCR_D
34
35	write32	CS0WCR_A, CS0WCR_D
36
37/*
38 * Setup CS3 (SDRAM).
39 */
40	write32	CS3BCR_A, CS3BCR_D
41
42	write32	CS3WCR_A, CS3WCR_D
43
44	write32	SDCR_A, SDCR_D1
45
46	write32	RTCSR_A, RTCSR_D
47
48	write32	RTCNT_A, RTCNT_D
49
50	write32	RTCOR_A, RTCOR_D
51
52	write32	SDCR_A, SDCR_D2
53
54	mov.l	SDMR3_A, r1
55	mov.l	SDMR3_D, r0
56	add	r0, r1
57	mov	#0, r0
58	mov.w	r0, @r1
59
60	rts
61	nop
62
63	.align 4
64
65/*
66 * Configuration for MPR2 A.3 through A.7
67 */
68
69/*
70 * PLL Settings
71 */
72FRQCR_D:	.word	0x1103		/* I:B:P=8:4:2 */
73WTCNT_D:	.word	0x5A00		/* start counting at zero */
74WTCSR_D:	.word	0xA507		/* divide by 4096 */
75.align 2
76/*
77 * Spansion S29GL256N11 @ 48 MHz
78 */
79/* 1 idle cycle inserted, normal space, 16 bit */
80CS0BCR_D:	.long	0x12490400
81/* tSW=0.5ck, 6 wait cycles, NO external wait, tHW=0.5ck */
82CS0WCR_D:	.long	0x00000340
83
84/*
85 * Samsung K4S511632B-UL75 @ 48 MHz
86 * Micron MT48LC32M16A2-75 @ 48 MHz
87 */
88/* CS3BCR = 0x10004400, minimum idle cycles, SDRAM, 16 bit */
89CS3BCR_D:	.long	0x10004400
90/* tRP=1ck, tRCD=1ck, CL=2, tRWL=2ck, tRC=4ck */
91CS3WCR_D:	.long	0x00000091
92/* no refresh, 13 rows, 10 cols, NO bank active mode */
93SDCR_D1:	.long	0x00000012
94SDCR_D2:	.long	0x00000812	/* refresh */
95RTCSR_D:	.long	0xA55A0008	/* 1/4, once */
96RTCNT_D:	.long	0xA55A005D	/* count 93 */
97RTCOR_D:	.long	0xa55a005d	/* count 93 */
98/* mode register CL2, burst read and SINGLE WRITE */
99SDMR3_D:	.long	0x440
100
101/*
102 * Registers
103 */
104
105FRQCR_A:	.long	0xA415FF80
106WTCNT_A:	.long	0xA415FF84
107WTCSR_A:	.long	0xA415FF86
108
109#define BSC_BASE	0xA4FD0000
110CS0BCR_A:	.long	BSC_BASE + 0x04
111CS3BCR_A:	.long	BSC_BASE + 0x0C
112CS0WCR_A:	.long	BSC_BASE + 0x24
113CS3WCR_A:	.long	BSC_BASE + 0x2C
114SDCR_A:		.long	BSC_BASE + 0x44
115RTCSR_A:	.long	BSC_BASE + 0x48
116RTCNT_A:	.long	BSC_BASE + 0x4C
117RTCOR_A:	.long	BSC_BASE + 0x50
118SDMR3_A:	.long	BSC_BASE + 0x5000
119