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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Slow clock support for AT91 architectures.
*
* Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
*
* Author: Claudiu Beznea <claudiu.beznea@microchip.com>
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <dt-bindings/clk/at91.h>
#include <linux/clk-provider.h>
#include "pmc.h"
#define UBOOT_DM_CLK_AT91_SAM9X60_TD_SLCK "at91-sam9x60-td-slck"
#define UBOOT_DM_CLK_AT91_SCKC "at91-sckc"
#define AT91_OSC_SEL BIT(24)
#define AT91_OSC_SEL_SHIFT (24)
struct sam9x60_sckc {
void __iomem *reg;
const char **parent_names;
unsigned int num_parents;
struct clk clk;
};
#define to_sam9x60_sckc(c) container_of(c, struct sam9x60_sckc, clk)
static int sam9x60_sckc_of_xlate(struct clk *clk,
struct ofnode_phandle_args *args)
{
if (args->args_count != 1) {
debug("AT91: SCKC: Invalid args_count: %d\n", args->args_count);
return -EINVAL;
}
clk->id = AT91_TO_CLK_ID(PMC_TYPE_SLOW, args->args[0]);
return 0;
}
static const struct clk_ops sam9x60_sckc_ops = {
.of_xlate = sam9x60_sckc_of_xlate,
.get_rate = clk_generic_get_rate,
};
static int sam9x60_td_slck_set_parent(struct clk *clk, struct clk *parent)
{
struct sam9x60_sckc *sckc = to_sam9x60_sckc(clk);
u32 i;
for (i = 0; i < sckc->num_parents; i++) {
if (!strcmp(parent->dev->name, sckc->parent_names[i]))
break;
}
if (i == sckc->num_parents)
return -EINVAL;
pmc_update_bits(sckc->reg, 0, AT91_OSC_SEL, (i << AT91_OSC_SEL_SHIFT));
return 0;
}
static const struct clk_ops sam9x60_td_slck_ops = {
.get_rate = clk_generic_get_rate,
.set_parent = sam9x60_td_slck_set_parent,
};
static struct clk *at91_sam9x60_clk_register_td_slck(struct sam9x60_sckc *sckc,
const char *name, const char * const *parent_names,
int num_parents)
{
struct clk *clk;
int ret = -ENOMEM;
u32 val, i;
if (!sckc || !name || !parent_names || num_parents != 2)
return ERR_PTR(-EINVAL);
sckc->parent_names = kzalloc(sizeof(*sckc->parent_names) * num_parents,
GFP_KERNEL);
if (!sckc->parent_names)
return ERR_PTR(ret);
for (i = 0; i < num_parents; i++) {
sckc->parent_names[i] = kmemdup(parent_names[i],
strlen(parent_names[i]) + 1, GFP_KERNEL);
if (!sckc->parent_names[i])
goto free;
}
sckc->num_parents = num_parents;
pmc_read(sckc->reg, 0, &val);
val = (val & AT91_OSC_SEL) >> AT91_OSC_SEL_SHIFT;
clk = &sckc->clk;
ret = clk_register(clk, UBOOT_DM_CLK_AT91_SAM9X60_TD_SLCK, name,
parent_names[val]);
if (ret)
goto free;
return clk;
free:
for (; i >= 0; i--)
kfree(sckc->parent_names[i]);
kfree(sckc->parent_names);
return ERR_PTR(ret);
}
U_BOOT_DRIVER(at91_sam9x60_td_slck) = {
.name = UBOOT_DM_CLK_AT91_SAM9X60_TD_SLCK,
.id = UCLASS_CLK,
.ops = &sam9x60_td_slck_ops,
.flags = DM_FLAG_PRE_RELOC,
};
static int at91_sam9x60_sckc_probe(struct udevice *dev)
{
struct sam9x60_sckc *sckc = dev_get_priv(dev);
void __iomem *base = (void *)devfdt_get_addr(dev);
const char *slow_rc_osc, *slow_osc;
const char *parents[2];
struct clk *clk, c;
int ret;
ret = clk_get_by_index(dev, 0, &c);
if (ret)
return ret;
slow_rc_osc = clk_hw_get_name(&c);
ret = clk_get_by_index(dev, 1, &c);
if (ret)
return ret;
slow_osc = clk_hw_get_name(&c);
clk = clk_register_fixed_factor(NULL, "md_slck", slow_rc_osc, 0, 1, 1);
if (IS_ERR(clk))
return PTR_ERR(clk);
clk_dm(AT91_TO_CLK_ID(PMC_TYPE_SLOW, 0), clk);
parents[0] = slow_rc_osc;
parents[1] = slow_osc;
sckc[1].reg = base;
clk = at91_sam9x60_clk_register_td_slck(&sckc[1], "td_slck",
parents, 2);
if (IS_ERR(clk))
return PTR_ERR(clk);
clk_dm(AT91_TO_CLK_ID(PMC_TYPE_SLOW, 1), clk);
return 0;
}
static const struct udevice_id sam9x60_sckc_ids[] = {
{ .compatible = "microchip,sam9x60-sckc" },
{ /* Sentinel. */ },
};
U_BOOT_DRIVER(at91_sckc) = {
.name = UBOOT_DM_CLK_AT91_SCKC,
.id = UCLASS_CLK,
.of_match = sam9x60_sckc_ids,
.priv_auto_alloc_size = sizeof(struct sam9x60_sckc) * 2,
.ops = &sam9x60_sckc_ops,
.probe = at91_sam9x60_sckc_probe,
.flags = DM_FLAG_PRE_RELOC,
};
|
