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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
|
// 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
#define CDNS_UFS_MAX_L4_ATTRS 12
struct cdns_ufs_host {
/**
* cdns_ufs_dme_attr_val - for storing L4 attributes
*/
u32 cdns_ufs_dme_attr_val[CDNS_UFS_MAX_L4_ATTRS];
};
/**
* cdns_ufs_get_l4_attr - get L4 attributes on local side
* @hba: per adapter instance
*
*/
static void cdns_ufs_get_l4_attr(struct ufs_hba *hba)
{
struct cdns_ufs_host *host = ufshcd_get_variant(hba);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERDEVICEID),
&host->cdns_ufs_dme_attr_val[0]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERCPORTID),
&host->cdns_ufs_dme_attr_val[1]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
&host->cdns_ufs_dme_attr_val[2]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_PROTOCOLID),
&host->cdns_ufs_dme_attr_val[3]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTFLAGS),
&host->cdns_ufs_dme_attr_val[4]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
&host->cdns_ufs_dme_attr_val[5]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
&host->cdns_ufs_dme_attr_val[6]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
&host->cdns_ufs_dme_attr_val[7]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
&host->cdns_ufs_dme_attr_val[8]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
&host->cdns_ufs_dme_attr_val[9]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTMODE),
&host->cdns_ufs_dme_attr_val[10]);
ufshcd_dme_get(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
&host->cdns_ufs_dme_attr_val[11]);
}
/**
* cdns_ufs_set_l4_attr - set L4 attributes on local side
* @hba: per adapter instance
*
*/
static void cdns_ufs_set_l4_attr(struct ufs_hba *hba)
{
struct cdns_ufs_host *host = ufshcd_get_variant(hba);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERDEVICEID),
host->cdns_ufs_dme_attr_val[0]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERCPORTID),
host->cdns_ufs_dme_attr_val[1]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
host->cdns_ufs_dme_attr_val[2]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_PROTOCOLID),
host->cdns_ufs_dme_attr_val[3]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTFLAGS),
host->cdns_ufs_dme_attr_val[4]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
host->cdns_ufs_dme_attr_val[5]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
host->cdns_ufs_dme_attr_val[6]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
host->cdns_ufs_dme_attr_val[7]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
host->cdns_ufs_dme_attr_val[8]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
host->cdns_ufs_dme_attr_val[9]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTMODE),
host->cdns_ufs_dme_attr_val[10]);
ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
host->cdns_ufs_dme_attr_val[11]);
}
/**
* 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;
}
/**
* Called before and after HCE enable bit is set.
* @hba: host controller instance
* @status: notify stage (pre, post change)
*
* Return zero for success and non-zero for failure
*/
static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
if (status != PRE_CHANGE)
return 0;
return cdns_ufs_set_hclkdiv(hba);
}
/**
* Called around hibern8 enter/exit.
* @hba: host controller instance
* @cmd: UIC Command
* @status: notify stage (pre, post change)
*
*/
static void cdns_ufs_hibern8_notify(struct ufs_hba *hba, enum uic_cmd_dme cmd,
enum ufs_notify_change_status status)
{
if (status == PRE_CHANGE && cmd == UIC_CMD_DME_HIBER_ENTER)
cdns_ufs_get_l4_attr(hba);
if (status == POST_CHANGE && cmd == UIC_CMD_DME_HIBER_EXIT)
cdns_ufs_set_l4_attr(hba);
}
/**
* Called before and after Link startup is carried out.
* @hba: host controller instance
* @status: notify stage (pre, post change)
*
* Return zero for success and non-zero for failure
*/
static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
if (status != PRE_CHANGE)
return 0;
/*
* Some UFS devices have issues if LCC is enabled.
* So we are setting PA_Local_TX_LCC_Enable to 0
* before link startup which will make sure that both host
* and device TX LCC are disabled once link startup is
* completed.
*/
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
/*
* Disabling Autohibern8 feature in cadence UFS
* to mask unexpected interrupt trigger.
*/
hba->ahit = 0;
return 0;
}
/**
* 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;
struct cdns_ufs_host *host;
struct device *dev = hba->dev;
host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
ufshcd_set_variant(hba, host);
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",
.init = cdns_ufs_init,
.hce_enable_notify = cdns_ufs_hce_enable_notify,
.link_startup_notify = cdns_ufs_link_startup_notify,
.hibern8_notify = cdns_ufs_hibern8_notify,
};
static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {
.name = "cdns-ufs-pltfm",
.init = cdns_ufs_init,
.hce_enable_notify = cdns_ufs_hce_enable_notify,
.link_startup_notify = cdns_ufs_link_startup_notify,
.phy_initialization = cdns_ufs_m31_16nm_phy_initialization,
.hibern8_notify = cdns_ufs_hibern8_notify,
};
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,
.shutdown = ufshcd_pltfrm_shutdown,
.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);
|
