1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Platform UFS Host driver for Cadence controller
4 *
5 * Copyright (C) 2018 Cadence Design Systems, Inc.
6 *
7 * Authors:
8 * Jan Kotas <jank@cadence.com>
9 *
10 */
11
12 #include <linux/clk.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/of.h>
17 #include <linux/time.h>
18
19 #include "ufshcd-pltfrm.h"
20
21 #define CDNS_UFS_REG_HCLKDIV 0xFC
22 #define CDNS_UFS_REG_PHY_XCFGD1 0x113C
23 #define CDNS_UFS_MAX_L4_ATTRS 12
24
25 struct cdns_ufs_host {
26 /**
27 * cdns_ufs_dme_attr_val - for storing L4 attributes
28 */
29 u32 cdns_ufs_dme_attr_val[CDNS_UFS_MAX_L4_ATTRS];
30 };
31
32 /**
33 * cdns_ufs_get_l4_attr - get L4 attributes on local side
34 * @hba: per adapter instance
35 *
36 */
cdns_ufs_get_l4_attr(struct ufs_hba * hba)37 static void cdns_ufs_get_l4_attr(struct ufs_hba *hba)
38 {
39 struct cdns_ufs_host *host = ufshcd_get_variant(hba);
40
41 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERDEVICEID),
42 &host->cdns_ufs_dme_attr_val[0]);
43 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERCPORTID),
44 &host->cdns_ufs_dme_attr_val[1]);
45 ufshcd_dme_get(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
46 &host->cdns_ufs_dme_attr_val[2]);
47 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PROTOCOLID),
48 &host->cdns_ufs_dme_attr_val[3]);
49 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTFLAGS),
50 &host->cdns_ufs_dme_attr_val[4]);
51 ufshcd_dme_get(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
52 &host->cdns_ufs_dme_attr_val[5]);
53 ufshcd_dme_get(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
54 &host->cdns_ufs_dme_attr_val[6]);
55 ufshcd_dme_get(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
56 &host->cdns_ufs_dme_attr_val[7]);
57 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
58 &host->cdns_ufs_dme_attr_val[8]);
59 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
60 &host->cdns_ufs_dme_attr_val[9]);
61 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTMODE),
62 &host->cdns_ufs_dme_attr_val[10]);
63 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
64 &host->cdns_ufs_dme_attr_val[11]);
65 }
66
67 /**
68 * cdns_ufs_set_l4_attr - set L4 attributes on local side
69 * @hba: per adapter instance
70 *
71 */
cdns_ufs_set_l4_attr(struct ufs_hba * hba)72 static void cdns_ufs_set_l4_attr(struct ufs_hba *hba)
73 {
74 struct cdns_ufs_host *host = ufshcd_get_variant(hba);
75
76 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0);
77 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERDEVICEID),
78 host->cdns_ufs_dme_attr_val[0]);
79 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERCPORTID),
80 host->cdns_ufs_dme_attr_val[1]);
81 ufshcd_dme_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
82 host->cdns_ufs_dme_attr_val[2]);
83 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PROTOCOLID),
84 host->cdns_ufs_dme_attr_val[3]);
85 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTFLAGS),
86 host->cdns_ufs_dme_attr_val[4]);
87 ufshcd_dme_set(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
88 host->cdns_ufs_dme_attr_val[5]);
89 ufshcd_dme_set(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
90 host->cdns_ufs_dme_attr_val[6]);
91 ufshcd_dme_set(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
92 host->cdns_ufs_dme_attr_val[7]);
93 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
94 host->cdns_ufs_dme_attr_val[8]);
95 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
96 host->cdns_ufs_dme_attr_val[9]);
97 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTMODE),
98 host->cdns_ufs_dme_attr_val[10]);
99 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
100 host->cdns_ufs_dme_attr_val[11]);
101 }
102
103 /**
104 * cdns_ufs_set_hclkdiv() - set HCLKDIV register value based on the core_clk.
105 * @hba: host controller instance
106 *
107 * Return: zero for success and non-zero for failure.
108 */
cdns_ufs_set_hclkdiv(struct ufs_hba * hba)109 static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
110 {
111 struct ufs_clk_info *clki;
112 struct list_head *head = &hba->clk_list_head;
113 unsigned long core_clk_rate = 0;
114 u32 core_clk_div = 0;
115
116 if (list_empty(head))
117 return 0;
118
119 list_for_each_entry(clki, head, list) {
120 if (IS_ERR_OR_NULL(clki->clk))
121 continue;
122 if (!strcmp(clki->name, "core_clk"))
123 core_clk_rate = clk_get_rate(clki->clk);
124 }
125
126 if (!core_clk_rate) {
127 dev_err(hba->dev, "%s: unable to find core_clk rate\n",
128 __func__);
129 return -EINVAL;
130 }
131
132 core_clk_div = core_clk_rate / USEC_PER_SEC;
133
134 ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
135 /**
136 * Make sure the register was updated,
137 * UniPro layer will not work with an incorrect value.
138 */
139 ufshcd_readl(hba, CDNS_UFS_REG_HCLKDIV);
140
141 return 0;
142 }
143
144 /**
145 * cdns_ufs_hce_enable_notify() - set HCLKDIV register
146 * @hba: host controller instance
147 * @status: notify stage (pre, post change)
148 *
149 * Return: zero for success and non-zero for failure.
150 */
cdns_ufs_hce_enable_notify(struct ufs_hba * hba,enum ufs_notify_change_status status)151 static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
152 enum ufs_notify_change_status status)
153 {
154 if (status != PRE_CHANGE)
155 return 0;
156
157 return cdns_ufs_set_hclkdiv(hba);
158 }
159
160 /**
161 * cdns_ufs_hibern8_notify() - save and restore L4 attributes.
162 * @hba: host controller instance
163 * @cmd: UIC Command
164 * @status: notify stage (pre, post change)
165 */
cdns_ufs_hibern8_notify(struct ufs_hba * hba,enum uic_cmd_dme cmd,enum ufs_notify_change_status status)166 static void cdns_ufs_hibern8_notify(struct ufs_hba *hba, enum uic_cmd_dme cmd,
167 enum ufs_notify_change_status status)
168 {
169 if (status == PRE_CHANGE && cmd == UIC_CMD_DME_HIBER_ENTER)
170 cdns_ufs_get_l4_attr(hba);
171 if (status == POST_CHANGE && cmd == UIC_CMD_DME_HIBER_EXIT)
172 cdns_ufs_set_l4_attr(hba);
173 }
174
175 /**
176 * cdns_ufs_link_startup_notify() - handle link startup.
177 * @hba: host controller instance
178 * @status: notify stage (pre, post change)
179 *
180 * Return: zero for success and non-zero for failure.
181 */
cdns_ufs_link_startup_notify(struct ufs_hba * hba,enum ufs_notify_change_status status)182 static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
183 enum ufs_notify_change_status status)
184 {
185 if (status != PRE_CHANGE)
186 return 0;
187
188 /*
189 * Some UFS devices have issues if LCC is enabled.
190 * So we are setting PA_Local_TX_LCC_Enable to 0
191 * before link startup which will make sure that both host
192 * and device TX LCC are disabled once link startup is
193 * completed.
194 */
195 ufshcd_disable_host_tx_lcc(hba);
196
197 /*
198 * Disabling Autohibern8 feature in cadence UFS
199 * to mask unexpected interrupt trigger.
200 */
201 hba->ahit = 0;
202
203 return 0;
204 }
205
206 /**
207 * cdns_ufs_init - performs additional ufs initialization
208 * @hba: host controller instance
209 *
210 * Return: status of initialization.
211 */
cdns_ufs_init(struct ufs_hba * hba)212 static int cdns_ufs_init(struct ufs_hba *hba)
213 {
214 int status = 0;
215 struct cdns_ufs_host *host;
216 struct device *dev = hba->dev;
217
218 host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
219
220 if (!host)
221 return -ENOMEM;
222 ufshcd_set_variant(hba, host);
223
224 status = ufshcd_vops_phy_initialization(hba);
225
226 return status;
227 }
228
229 /**
230 * cdns_ufs_m31_16nm_phy_initialization - performs m31 phy initialization
231 * @hba: host controller instance
232 *
233 * Return: 0 (success).
234 */
cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba * hba)235 static int cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba *hba)
236 {
237 u32 data;
238
239 /* Increase RX_Advanced_Min_ActivateTime_Capability */
240 data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
241 data |= BIT(24);
242 ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
243
244 return 0;
245 }
246
247 static const struct ufs_hba_variant_ops cdns_ufs_pltfm_hba_vops = {
248 .name = "cdns-ufs-pltfm",
249 .init = cdns_ufs_init,
250 .hce_enable_notify = cdns_ufs_hce_enable_notify,
251 .link_startup_notify = cdns_ufs_link_startup_notify,
252 .hibern8_notify = cdns_ufs_hibern8_notify,
253 };
254
255 static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {
256 .name = "cdns-ufs-pltfm",
257 .init = cdns_ufs_init,
258 .hce_enable_notify = cdns_ufs_hce_enable_notify,
259 .link_startup_notify = cdns_ufs_link_startup_notify,
260 .phy_initialization = cdns_ufs_m31_16nm_phy_initialization,
261 .hibern8_notify = cdns_ufs_hibern8_notify,
262 };
263
264 static const struct of_device_id cdns_ufs_of_match[] = {
265 {
266 .compatible = "cdns,ufshc",
267 .data = &cdns_ufs_pltfm_hba_vops,
268 },
269 {
270 .compatible = "cdns,ufshc-m31-16nm",
271 .data = &cdns_ufs_m31_16nm_pltfm_hba_vops,
272 },
273 { },
274 };
275
276 MODULE_DEVICE_TABLE(of, cdns_ufs_of_match);
277
278 /**
279 * cdns_ufs_pltfrm_probe - probe routine of the driver
280 * @pdev: pointer to platform device handle
281 *
282 * Return: zero for success and non-zero for failure.
283 */
cdns_ufs_pltfrm_probe(struct platform_device * pdev)284 static int cdns_ufs_pltfrm_probe(struct platform_device *pdev)
285 {
286 int err;
287 const struct of_device_id *of_id;
288 struct ufs_hba_variant_ops *vops;
289 struct device *dev = &pdev->dev;
290
291 of_id = of_match_node(cdns_ufs_of_match, dev->of_node);
292 vops = (struct ufs_hba_variant_ops *)of_id->data;
293
294 /* Perform generic probe */
295 err = ufshcd_pltfrm_init(pdev, vops);
296 if (err)
297 dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
298
299 return err;
300 }
301
302 /**
303 * cdns_ufs_pltfrm_remove - removes the ufs driver
304 * @pdev: pointer to platform device handle
305 *
306 * Return: 0 (success).
307 */
cdns_ufs_pltfrm_remove(struct platform_device * pdev)308 static int cdns_ufs_pltfrm_remove(struct platform_device *pdev)
309 {
310 struct ufs_hba *hba = platform_get_drvdata(pdev);
311
312 ufshcd_remove(hba);
313 return 0;
314 }
315
316 static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
317 SET_SYSTEM_SLEEP_PM_OPS(ufshcd_system_suspend, ufshcd_system_resume)
318 SET_RUNTIME_PM_OPS(ufshcd_runtime_suspend, ufshcd_runtime_resume, NULL)
319 .prepare = ufshcd_suspend_prepare,
320 .complete = ufshcd_resume_complete,
321 };
322
323 static struct platform_driver cdns_ufs_pltfrm_driver = {
324 .probe = cdns_ufs_pltfrm_probe,
325 .remove = cdns_ufs_pltfrm_remove,
326 .driver = {
327 .name = "cdns-ufshcd",
328 .pm = &cdns_ufs_dev_pm_ops,
329 .of_match_table = cdns_ufs_of_match,
330 },
331 };
332
333 module_platform_driver(cdns_ufs_pltfrm_driver);
334
335 MODULE_AUTHOR("Jan Kotas <jank@cadence.com>");
336 MODULE_DESCRIPTION("Cadence UFS host controller platform driver");
337 MODULE_LICENSE("GPL v2");
338