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
|
/*
* Copyright 2010-2011 Freescale Semiconductor, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/io.h>
#include "ics307_clk.h"
#if defined(CONFIG_FSL_NGPIXIS)
#include "ngpixis.h"
#define fpga_reg pixis
#elif defined(CONFIG_FSL_QIXIS)
#include "qixis.h"
#define fpga_reg ((struct qixis *)QIXIS_BASE)
#else
#include "pixis.h"
#define fpga_reg pixis
#endif
/* define for SYS CLK or CLK1Frequency */
#define TTL 1
#define CLK2 0
#define CRYSTAL 0
#define MAX_VDW (511 + 8)
#define MAX_RDW (127 + 2)
#define MIN_VDW (4 + 8)
#define MIN_RDW (1 + 2)
#define NUM_OD_SETTING 8
/*
* These defines cover the industrial temperature range part,
* for commercial, change below to 400000 and 55000, respectively
*/
#define MAX_VCO 360000
#define MIN_VCO 60000
/* decode S[0-2] to Output Divider (OD) */
static u8 ics307_s_to_od[] = {
10, 2, 8, 4, 5, 7, 3, 6
};
/*
* Find one solution to generate required frequency for SYSCLK
* out_freq: KHz, required frequency to the SYSCLK
* the result will be retuned with component RDW, VDW, OD, TTL,
* CLK2 and crystal
*/
unsigned long ics307_sysclk_calculator(unsigned long out_freq)
{
const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ;
unsigned long vdw, rdw, odp, s_vdw = 0, s_rdw = 0, s_odp = 0, od;
unsigned long tmp_out, diff, result = 0;
int found = 0;
for (odp = 0; odp < NUM_OD_SETTING; odp++) {
od = ics307_s_to_od[odp];
if (od * out_freq < MIN_VCO || od * out_freq > MAX_VCO)
continue;
for (rdw = MIN_RDW; rdw <= MAX_RDW; rdw++) {
/* Calculate the VDW */
vdw = out_freq * 1000 * od * rdw / (input_freq * 2);
if (vdw > MAX_VDW)
vdw = MAX_VDW;
if (vdw < MIN_VDW)
continue;
/* Calculate the temp out frequency */
tmp_out = input_freq * 2 * vdw / (rdw * od * 1000);
diff = MAX(out_freq, tmp_out) - MIN(out_freq, tmp_out);
/*
* calculate the percent, the precision is 1/1000
* If greater than 1/1000, continue
* otherwise, we think the solution is we required
*/
if (diff * 1000 / out_freq > 1)
continue;
else {
s_vdw = vdw;
s_rdw = rdw;
s_odp = odp;
found = 1;
break;
}
}
}
if (found)
result = (s_rdw - 2) | (s_vdw - 8) << 7 | s_odp << 16 |
CLK2 << 19 | TTL << 21 | CRYSTAL << 22;
debug("ICS307-02: RDW: %ld, VDW: %ld, OD: %d\n", s_rdw - 2, s_vdw - 8,
ics307_s_to_od[s_odp]);
return result;
}
/*
* Calculate frequency being generated by ICS307-02 clock chip based upon
* the control bytes being programmed into it.
*/
static unsigned long ics307_clk_freq(u8 cw0, u8 cw1, u8 cw2)
{
const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ;
unsigned long vdw = ((cw1 << 1) & 0x1FE) + ((cw2 >> 7) & 1);
unsigned long rdw = cw2 & 0x7F;
unsigned long od = ics307_s_to_od[cw0 & 0x7];
unsigned long freq;
/*
* CLK1 Freq = Input Frequency * 2 * (VDW + 8) / ((RDW + 2) * OD)
*
* cw0: C1 C0 TTL F1 F0 S2 S1 S0
* cw1: V8 V7 V6 V5 V4 V3 V2 V1
* cw2: V0 R6 R5 R4 R3 R2 R1 R0
*
* R6:R0 = Reference Divider Word (RDW)
* V8:V0 = VCO Divider Word (VDW)
* S2:S0 = Output Divider Select (OD)
* F1:F0 = Function of CLK2 Output
* TTL = duty cycle
* C1:C0 = internal load capacitance for cyrstal
*
*/
freq = input_freq * 2 * (vdw + 8) / ((rdw + 2) * od);
debug("ICS307: CW[0-2]: %02X %02X %02X => %lu Hz\n", cw0, cw1, cw2,
freq);
return freq;
}
unsigned long get_board_sys_clk(void)
{
return ics307_clk_freq(
in_8(&fpga_reg->sclk[0]),
in_8(&fpga_reg->sclk[1]),
in_8(&fpga_reg->sclk[2]));
}
unsigned long get_board_ddr_clk(void)
{
return ics307_clk_freq(
in_8(&fpga_reg->dclk[0]),
in_8(&fpga_reg->dclk[1]),
in_8(&fpga_reg->dclk[2]));
}
|
