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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/bitfield.h>
#include <linux/cleanup.h>
#include <linux/dev_printk.h>
#include <linux/string.h>
#include <linux/string_choices.h>
#include <linux/types.h>
#include "core.h"
#include "ref.h"
/**
* zl3073x_ref_freq_factorize - factorize given frequency
* @freq: input frequency
* @base: base frequency
* @mult: multiplier
*
* Checks if the given frequency can be factorized using one of the
* supported base frequencies. If so the base frequency and multiplier
* are stored into appropriate parameters if they are not NULL.
*
* Return: 0 on success, -EINVAL if the frequency cannot be factorized
*/
int
zl3073x_ref_freq_factorize(u32 freq, u16 *base, u16 *mult)
{
static const u16 base_freqs[] = {
1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125,
128, 160, 200, 250, 256, 320, 400, 500, 625, 640, 800, 1000,
1250, 1280, 1600, 2000, 2500, 3125, 3200, 4000, 5000, 6250,
6400, 8000, 10000, 12500, 15625, 16000, 20000, 25000, 31250,
32000, 40000, 50000, 62500,
};
u32 div;
int i;
for (i = 0; i < ARRAY_SIZE(base_freqs); i++) {
div = freq / base_freqs[i];
if (div <= U16_MAX && (freq % base_freqs[i]) == 0) {
if (base)
*base = base_freqs[i];
if (mult)
*mult = div;
return 0;
}
}
return -EINVAL;
}
/**
* zl3073x_ref_state_fetch - fetch input reference state from hardware
* @zldev: pointer to zl3073x_dev structure
* @index: input reference index to fetch state for
*
* Function fetches state for the given input reference from hardware and
* stores it for later use.
*
* Return: 0 on success, <0 on error
*/
int zl3073x_ref_state_fetch(struct zl3073x_dev *zldev, u8 index)
{
struct zl3073x_ref *ref = &zldev->ref[index];
int rc;
/* For differential type inputs the N-pin reference shares
* part of the configuration with the P-pin counterpart.
*/
if (zl3073x_is_n_pin(index) && zl3073x_ref_is_diff(ref - 1)) {
struct zl3073x_ref *p_ref = ref - 1; /* P-pin counterpart*/
/* Copy the shared items from the P-pin */
ref->config = p_ref->config;
ref->esync_n_div = p_ref->esync_n_div;
ref->freq_base = p_ref->freq_base;
ref->freq_mult = p_ref->freq_mult;
ref->freq_ratio_m = p_ref->freq_ratio_m;
ref->freq_ratio_n = p_ref->freq_ratio_n;
ref->phase_comp = p_ref->phase_comp;
ref->sync_ctrl = p_ref->sync_ctrl;
return 0; /* Finish - no non-shared items for now */
}
guard(mutex)(&zldev->multiop_lock);
/* Read reference configuration */
rc = zl3073x_mb_op(zldev, ZL_REG_REF_MB_SEM, ZL_REF_MB_SEM_RD,
ZL_REG_REF_MB_MASK, BIT(index));
if (rc)
return rc;
/* Read ref_config register */
rc = zl3073x_read_u8(zldev, ZL_REG_REF_CONFIG, &ref->config);
if (rc)
return rc;
/* Read frequency related registers */
rc = zl3073x_read_u16(zldev, ZL_REG_REF_FREQ_BASE, &ref->freq_base);
if (rc)
return rc;
rc = zl3073x_read_u16(zldev, ZL_REG_REF_FREQ_MULT, &ref->freq_mult);
if (rc)
return rc;
rc = zl3073x_read_u16(zldev, ZL_REG_REF_RATIO_M, &ref->freq_ratio_m);
if (rc)
return rc;
rc = zl3073x_read_u16(zldev, ZL_REG_REF_RATIO_N, &ref->freq_ratio_n);
if (rc)
return rc;
/* Read eSync and N-div rated registers */
rc = zl3073x_read_u32(zldev, ZL_REG_REF_ESYNC_DIV, &ref->esync_n_div);
if (rc)
return rc;
rc = zl3073x_read_u8(zldev, ZL_REG_REF_SYNC_CTRL, &ref->sync_ctrl);
if (rc)
return rc;
/* Read phase compensation register */
rc = zl3073x_read_u48(zldev, ZL_REG_REF_PHASE_OFFSET_COMP,
&ref->phase_comp);
if (rc)
return rc;
dev_dbg(zldev->dev, "REF%u is %s and configured as %s\n", index,
str_enabled_disabled(zl3073x_ref_is_enabled(ref)),
zl3073x_ref_is_diff(ref) ? "differential" : "single-ended");
return rc;
}
/**
* zl3073x_ref_state_get - get current input reference state
* @zldev: pointer to zl3073x_dev structure
* @index: input reference index to get state for
*
* Return: pointer to given input reference state
*/
const struct zl3073x_ref *
zl3073x_ref_state_get(struct zl3073x_dev *zldev, u8 index)
{
return &zldev->ref[index];
}
int zl3073x_ref_state_set(struct zl3073x_dev *zldev, u8 index,
const struct zl3073x_ref *ref)
{
struct zl3073x_ref *dref = &zldev->ref[index];
int rc;
guard(mutex)(&zldev->multiop_lock);
/* Read reference configuration into mailbox */
rc = zl3073x_mb_op(zldev, ZL_REG_REF_MB_SEM, ZL_REF_MB_SEM_RD,
ZL_REG_REF_MB_MASK, BIT(index));
if (rc)
return rc;
/* Update mailbox with changed values */
if (dref->freq_base != ref->freq_base)
rc = zl3073x_write_u16(zldev, ZL_REG_REF_FREQ_BASE,
ref->freq_base);
if (!rc && dref->freq_mult != ref->freq_mult)
rc = zl3073x_write_u16(zldev, ZL_REG_REF_FREQ_MULT,
ref->freq_mult);
if (!rc && dref->freq_ratio_m != ref->freq_ratio_m)
rc = zl3073x_write_u16(zldev, ZL_REG_REF_RATIO_M,
ref->freq_ratio_m);
if (!rc && dref->freq_ratio_n != ref->freq_ratio_n)
rc = zl3073x_write_u16(zldev, ZL_REG_REF_RATIO_N,
ref->freq_ratio_n);
if (!rc && dref->esync_n_div != ref->esync_n_div)
rc = zl3073x_write_u32(zldev, ZL_REG_REF_ESYNC_DIV,
ref->esync_n_div);
if (!rc && dref->sync_ctrl != ref->sync_ctrl)
rc = zl3073x_write_u8(zldev, ZL_REG_REF_SYNC_CTRL,
ref->sync_ctrl);
if (!rc && dref->phase_comp != ref->phase_comp)
rc = zl3073x_write_u48(zldev, ZL_REG_REF_PHASE_OFFSET_COMP,
ref->phase_comp);
if (rc)
return rc;
/* Commit reference configuration */
rc = zl3073x_mb_op(zldev, ZL_REG_REF_MB_SEM, ZL_REF_MB_SEM_WR,
ZL_REG_REF_MB_MASK, BIT(index));
if (rc)
return rc;
/* After successful commit store new state */
dref->freq_base = ref->freq_base;
dref->freq_mult = ref->freq_mult;
dref->freq_ratio_m = ref->freq_ratio_m;
dref->freq_ratio_n = ref->freq_ratio_n;
dref->esync_n_div = ref->esync_n_div;
dref->sync_ctrl = ref->sync_ctrl;
dref->phase_comp = ref->phase_comp;
return 0;
}
|
