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
|
// SPDX-License-Identifier: BSD-3-Clause
/*
* Clock drivers for Qualcomm APQ8016, APQ8096
*
* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
*
* Based on Little Kernel driver, simplified
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <errno.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include "clock-snapdragon.h"
/* CBCR register fields */
#define CBCR_BRANCH_ENABLE_BIT BIT(0)
#define CBCR_BRANCH_OFF_BIT BIT(31)
extern ulong msm_set_rate(struct clk *clk, ulong rate);
extern int msm_enable(struct clk *clk);
/* Enable clock controlled by CBC soft macro */
void clk_enable_cbc(phys_addr_t cbcr)
{
setbits_le32(cbcr, CBCR_BRANCH_ENABLE_BIT);
while (readl(cbcr) & CBCR_BRANCH_OFF_BIT)
;
}
void clk_enable_gpll0(phys_addr_t base, const struct pll_vote_clk *gpll0)
{
if (readl(base + gpll0->status) & gpll0->status_bit)
return; /* clock already enabled */
setbits_le32(base + gpll0->ena_vote, gpll0->vote_bit);
while ((readl(base + gpll0->status) & gpll0->status_bit) == 0)
;
}
#define BRANCH_ON_VAL (0)
#define BRANCH_NOC_FSM_ON_VAL BIT(29)
#define BRANCH_CHECK_MASK GENMASK(31, 28)
void clk_enable_vote_clk(phys_addr_t base, const struct vote_clk *vclk)
{
u32 val;
setbits_le32(base + vclk->ena_vote, vclk->vote_bit);
do {
val = readl(base + vclk->cbcr_reg);
val &= BRANCH_CHECK_MASK;
} while ((val != BRANCH_ON_VAL) && (val != BRANCH_NOC_FSM_ON_VAL));
}
#define APPS_CMD_RCGR_UPDATE BIT(0)
/* Update clock command via CMD_RCGR */
void clk_bcr_update(phys_addr_t apps_cmd_rcgr)
{
setbits_le32(apps_cmd_rcgr, APPS_CMD_RCGR_UPDATE);
/* Wait for frequency to be updated. */
while (readl(apps_cmd_rcgr) & APPS_CMD_RCGR_UPDATE)
;
}
#define CFG_MODE_DUAL_EDGE (0x2 << 12) /* Counter mode */
#define CFG_MASK 0x3FFF
#define CFG_DIVIDER_MASK 0x1F
/* root set rate for clocks with half integer and MND divider */
void clk_rcg_set_rate_mnd(phys_addr_t base, const struct bcr_regs *regs,
int div, int m, int n, int source)
{
u32 cfg;
/* M value for MND divider. */
u32 m_val = m;
/* NOT(N-M) value for MND divider. */
u32 n_val = ~((n) - (m)) * !!(n);
/* NOT 2D value for MND divider. */
u32 d_val = ~(n);
/* Program MND values */
writel(m_val, base + regs->M);
writel(n_val, base + regs->N);
writel(d_val, base + regs->D);
/* setup src select and divider */
cfg = readl(base + regs->cfg_rcgr);
cfg &= ~CFG_MASK;
cfg |= source & CFG_CLK_SRC_MASK; /* Select clock source */
/* Set the divider; HW permits fraction dividers (+0.5), but
for simplicity, we will support integers only */
if (div)
cfg |= (2 * div - 1) & CFG_DIVIDER_MASK;
if (n_val)
cfg |= CFG_MODE_DUAL_EDGE;
writel(cfg, base + regs->cfg_rcgr); /* Write new clock configuration */
/* Inform h/w to start using the new config. */
clk_bcr_update(base + regs->cmd_rcgr);
}
/* root set rate for clocks with half integer and mnd_width=0 */
void clk_rcg_set_rate(phys_addr_t base, const struct bcr_regs *regs, int div,
int source)
{
u32 cfg;
/* setup src select and divider */
cfg = readl(base + regs->cfg_rcgr);
cfg &= ~CFG_MASK;
cfg |= source & CFG_CLK_SRC_MASK; /* Select clock source */
/*
* Set the divider; HW permits fraction dividers (+0.5), but
* for simplicity, we will support integers only
*/
if (div)
cfg |= (2 * div - 1) & CFG_DIVIDER_MASK;
writel(cfg, base + regs->cfg_rcgr); /* Write new clock configuration */
/* Inform h/w to start using the new config. */
clk_bcr_update(base + regs->cmd_rcgr);
}
static int msm_clk_probe(struct udevice *dev)
{
struct msm_clk_priv *priv = dev_get_priv(dev);
priv->base = dev_read_addr(dev);
if (priv->base == FDT_ADDR_T_NONE)
return -EINVAL;
return 0;
}
static ulong msm_clk_set_rate(struct clk *clk, ulong rate)
{
return msm_set_rate(clk, rate);
}
static int msm_clk_enable(struct clk *clk)
{
return msm_enable(clk);
}
static struct clk_ops msm_clk_ops = {
.set_rate = msm_clk_set_rate,
.enable = msm_clk_enable,
};
static const struct udevice_id msm_clk_ids[] = {
{ .compatible = "qcom,gcc-msm8916" },
{ .compatible = "qcom,gcc-apq8016" },
{ .compatible = "qcom,gcc-msm8996" },
{ .compatible = "qcom,gcc-apq8096" },
{ .compatible = "qcom,gcc-sdm845" },
{ .compatible = "qcom,gcc-qcs404" },
{ }
};
U_BOOT_DRIVER(clk_msm) = {
.name = "clk_msm",
.id = UCLASS_CLK,
.of_match = msm_clk_ids,
.ops = &msm_clk_ops,
.priv_auto = sizeof(struct msm_clk_priv),
.probe = msm_clk_probe,
};
|