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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Platform UFS Host driver for Cadence controller
*
* Copyright (C) 2018 Cadence Design Systems, Inc.
*
* Authors:
* Jan Kotas <jank@cadence.com>
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/time.h>
#include "ufshcd-pltfrm.h"
#define CDNS_UFS_REG_HCLKDIV 0xFC
#define CDNS_UFS_REG_PHY_XCFGD1 0x113C
/**
* Sets HCLKDIV register value based on the core_clk
* @hba: host controller instance
*
* Return zero for success and non-zero for failure
*/
static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
{
struct ufs_clk_info *clki;
struct list_head *head = &hba->clk_list_head;
unsigned long core_clk_rate = 0;
u32 core_clk_div = 0;
if (list_empty(head))
return 0;
list_for_each_entry(clki, head, list) {
if (IS_ERR_OR_NULL(clki->clk))
continue;
if (!strcmp(clki->name, "core_clk"))
core_clk_rate = clk_get_rate(clki->clk);
}
if (!core_clk_rate) {
dev_err(hba->dev, "%s: unable to find core_clk rate\n",
__func__);
return -EINVAL;
}
core_clk_div = core_clk_rate / USEC_PER_SEC;
ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
/**
* Make sure the register was updated,
* UniPro layer will not work with an incorrect value.
*/
mb();
return 0;
}
/**
* Sets clocks used by the controller
* @hba: host controller instance
* @on: if true, enable clocks, otherwise disable
* @status: notify stage (pre, post change)
*
* Return zero for success and non-zero for failure
*/
static int cdns_ufs_setup_clocks(struct ufs_hba *hba, bool on,
enum ufs_notify_change_status status)
{
if ((!on) || (status == PRE_CHANGE))
return 0;
return cdns_ufs_set_hclkdiv(hba);
}
/**
* cdns_ufs_init - performs additional ufs initialization
* @hba: host controller instance
*
* Returns status of initialization
*/
static int cdns_ufs_init(struct ufs_hba *hba)
{
int status = 0;
if (hba->vops && hba->vops->phy_initialization)
status = hba->vops->phy_initialization(hba);
return status;
}
/**
* cdns_ufs_m31_16nm_phy_initialization - performs m31 phy initialization
* @hba: host controller instance
*
* Always returns 0
*/
static int cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba *hba)
{
u32 data;
/* Increase RX_Advanced_Min_ActivateTime_Capability */
data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
data |= BIT(24);
ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
return 0;
}
static const struct ufs_hba_variant_ops cdns_ufs_pltfm_hba_vops = {
.name = "cdns-ufs-pltfm",
.setup_clocks = cdns_ufs_setup_clocks,
};
static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {
.name = "cdns-ufs-pltfm",
.init = cdns_ufs_init,
.setup_clocks = cdns_ufs_setup_clocks,
.phy_initialization = cdns_ufs_m31_16nm_phy_initialization,
};
static const struct of_device_id cdns_ufs_of_match[] = {
{
.compatible = "cdns,ufshc",
.data = &cdns_ufs_pltfm_hba_vops,
},
{
.compatible = "cdns,ufshc-m31-16nm",
.data = &cdns_ufs_m31_16nm_pltfm_hba_vops,
},
{ },
};
MODULE_DEVICE_TABLE(of, cdns_ufs_of_match);
/**
* cdns_ufs_pltfrm_probe - probe routine of the driver
* @pdev: pointer to platform device handle
*
* Return zero for success and non-zero for failure
*/
static int cdns_ufs_pltfrm_probe(struct platform_device *pdev)
{
int err;
const struct of_device_id *of_id;
struct ufs_hba_variant_ops *vops;
struct device *dev = &pdev->dev;
of_id = of_match_node(cdns_ufs_of_match, dev->of_node);
vops = (struct ufs_hba_variant_ops *)of_id->data;
/* Perform generic probe */
err = ufshcd_pltfrm_init(pdev, vops);
if (err)
dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
return err;
}
/**
* cdns_ufs_pltfrm_remove - removes the ufs driver
* @pdev: pointer to platform device handle
*
* Always returns 0
*/
static int cdns_ufs_pltfrm_remove(struct platform_device *pdev)
{
struct ufs_hba *hba = platform_get_drvdata(pdev);
ufshcd_remove(hba);
return 0;
}
static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
.suspend = ufshcd_pltfrm_suspend,
.resume = ufshcd_pltfrm_resume,
.runtime_suspend = ufshcd_pltfrm_runtime_suspend,
.runtime_resume = ufshcd_pltfrm_runtime_resume,
.runtime_idle = ufshcd_pltfrm_runtime_idle,
};
static struct platform_driver cdns_ufs_pltfrm_driver = {
.probe = cdns_ufs_pltfrm_probe,
.remove = cdns_ufs_pltfrm_remove,
.driver = {
.name = "cdns-ufshcd",
.pm = &cdns_ufs_dev_pm_ops,
.of_match_table = cdns_ufs_of_match,
},
};
module_platform_driver(cdns_ufs_pltfrm_driver);
MODULE_AUTHOR("Jan Kotas <jank@cadence.com>");
MODULE_DESCRIPTION("Cadence UFS host controller platform driver");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(UFSHCD_DRIVER_VERSION);
|
