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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* File: arch/blackfin/mach-bf527/head.S
* Based on: arch/blackfin/mach-bf533/head.S
* Author: Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
*
* Created: 1998
* Description: Startup code for Blackfin BF537
*
* Modified:
* Copyright 2004-2007 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/blackfin.h>
#ifdef CONFIG_BFIN_KERNEL_CLOCK
#include <asm/mach-common/clocks.h>
#include <asm/mach/mem_init.h>
#endif
.extern _bf53x_relocate_l1_mem
__INIT
ENTRY(_mach_early_start)
/* Initialise UART - when booting from u-boot, the UART is not disabled
* so if we dont initalize here, our serial console gets hosed */
p0.h = hi(UART1_LCR);
p0.l = lo(UART1_LCR);
r0 = 0x0(Z);
w[p0] = r0.L; /* To enable DLL writes */
ssync;
p0.h = hi(UART1_DLL);
p0.l = lo(UART1_DLL);
r0 = 0x0(Z);
w[p0] = r0.L;
ssync;
p0.h = hi(UART1_DLH);
p0.l = lo(UART1_DLH);
r0 = 0x00(Z);
w[p0] = r0.L;
ssync;
p0.h = hi(UART1_GCTL);
p0.l = lo(UART1_GCTL);
r0 = 0x0(Z);
w[p0] = r0.L; /* To enable UART clock */
ssync;
rts;
ENDPROC(_mach_early_start)
__FINIT
.section .l1.text
#ifdef CONFIG_BFIN_KERNEL_CLOCK
ENTRY(_start_dma_code)
/* Enable PHY CLK buffer output */
p0.h = hi(VR_CTL);
p0.l = lo(VR_CTL);
r0.l = w[p0];
bitset(r0, 14);
w[p0] = r0.l;
ssync;
p0.h = hi(SIC_IWR0);
p0.l = lo(SIC_IWR0);
r0.l = 0x1;
r0.h = 0x0;
[p0] = r0;
SSYNC;
/*
* Set PLL_CTL
* - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
* - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
* - [7] = output delay (add 200ps of delay to mem signals)
* - [6] = input delay (add 200ps of input delay to mem signals)
* - [5] = PDWN : 1=All Clocks off
* - [3] = STOPCK : 1=Core Clock off
* - [1] = PLL_OFF : 1=Disable Power to PLL
* - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
* all other bits set to zero
*/
p0.h = hi(PLL_LOCKCNT);
p0.l = lo(PLL_LOCKCNT);
r0 = 0x300(Z);
w[p0] = r0.l;
ssync;
P2.H = hi(EBIU_SDGCTL);
P2.L = lo(EBIU_SDGCTL);
R0 = [P2];
BITSET (R0, 24);
[P2] = R0;
SSYNC;
r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
r0 = r0 << 9; /* Shift it over, */
r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
r0 = r1 | r0;
r1 = PLL_BYPASS; /* Bypass the PLL? */
r1 = r1 << 8; /* Shift it over */
r0 = r1 | r0; /* add them all together */
p0.h = hi(PLL_CTL);
p0.l = lo(PLL_CTL); /* Load the address */
cli r2; /* Disable interrupts */
ssync;
w[p0] = r0.l; /* Set the value */
idle; /* Wait for the PLL to stablize */
sti r2; /* Enable interrupts */
.Lcheck_again:
p0.h = hi(PLL_STAT);
p0.l = lo(PLL_STAT);
R0 = W[P0](Z);
CC = BITTST(R0,5);
if ! CC jump .Lcheck_again;
/* Configure SCLK & CCLK Dividers */
r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
p0.h = hi(PLL_DIV);
p0.l = lo(PLL_DIV);
w[p0] = r0.l;
ssync;
p0.l = lo(EBIU_SDRRC);
p0.h = hi(EBIU_SDRRC);
r0 = mem_SDRRC;
w[p0] = r0.l;
ssync;
P2.H = hi(EBIU_SDGCTL);
P2.L = lo(EBIU_SDGCTL);
R0 = [P2];
BITCLR (R0, 24);
p0.h = hi(EBIU_SDSTAT);
p0.l = lo(EBIU_SDSTAT);
r2.l = w[p0];
cc = bittst(r2,3);
if !cc jump .Lskip;
NOP;
BITSET (R0, 23);
.Lskip:
[P2] = R0;
SSYNC;
R0.L = lo(mem_SDGCTL);
R0.H = hi(mem_SDGCTL);
R1 = [p2];
R1 = R1 | R0;
[P2] = R1;
SSYNC;
RTS;
ENDPROC(_start_dma_code)
#endif /* CONFIG_BFIN_KERNEL_CLOCK */
|
