WIP FPC-III support
[linux/fpc-iii.git] / drivers / scsi / ufs / cdns-pltfrm.c
blob149391faa19c107f3457b5df13580388e4276dd5
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Platform UFS Host driver for Cadence controller
5 * Copyright (C) 2018 Cadence Design Systems, Inc.
7 * Authors:
8 * Jan Kotas <jank@cadence.com>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/of.h>
16 #include <linux/time.h>
18 #include "ufshcd-pltfrm.h"
20 #define CDNS_UFS_REG_HCLKDIV 0xFC
21 #define CDNS_UFS_REG_PHY_XCFGD1 0x113C
22 #define CDNS_UFS_MAX_L4_ATTRS 12
24 struct cdns_ufs_host {
25 /**
26 * cdns_ufs_dme_attr_val - for storing L4 attributes
28 u32 cdns_ufs_dme_attr_val[CDNS_UFS_MAX_L4_ATTRS];
31 /**
32 * cdns_ufs_get_l4_attr - get L4 attributes on local side
33 * @hba: per adapter instance
36 static void cdns_ufs_get_l4_attr(struct ufs_hba *hba)
38 struct cdns_ufs_host *host = ufshcd_get_variant(hba);
40 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERDEVICEID),
41 &host->cdns_ufs_dme_attr_val[0]);
42 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERCPORTID),
43 &host->cdns_ufs_dme_attr_val[1]);
44 ufshcd_dme_get(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
45 &host->cdns_ufs_dme_attr_val[2]);
46 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PROTOCOLID),
47 &host->cdns_ufs_dme_attr_val[3]);
48 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTFLAGS),
49 &host->cdns_ufs_dme_attr_val[4]);
50 ufshcd_dme_get(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
51 &host->cdns_ufs_dme_attr_val[5]);
52 ufshcd_dme_get(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
53 &host->cdns_ufs_dme_attr_val[6]);
54 ufshcd_dme_get(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
55 &host->cdns_ufs_dme_attr_val[7]);
56 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
57 &host->cdns_ufs_dme_attr_val[8]);
58 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
59 &host->cdns_ufs_dme_attr_val[9]);
60 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTMODE),
61 &host->cdns_ufs_dme_attr_val[10]);
62 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
63 &host->cdns_ufs_dme_attr_val[11]);
66 /**
67 * cdns_ufs_set_l4_attr - set L4 attributes on local side
68 * @hba: per adapter instance
71 static void cdns_ufs_set_l4_attr(struct ufs_hba *hba)
73 struct cdns_ufs_host *host = ufshcd_get_variant(hba);
75 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0);
76 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERDEVICEID),
77 host->cdns_ufs_dme_attr_val[0]);
78 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERCPORTID),
79 host->cdns_ufs_dme_attr_val[1]);
80 ufshcd_dme_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
81 host->cdns_ufs_dme_attr_val[2]);
82 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PROTOCOLID),
83 host->cdns_ufs_dme_attr_val[3]);
84 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTFLAGS),
85 host->cdns_ufs_dme_attr_val[4]);
86 ufshcd_dme_set(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
87 host->cdns_ufs_dme_attr_val[5]);
88 ufshcd_dme_set(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
89 host->cdns_ufs_dme_attr_val[6]);
90 ufshcd_dme_set(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
91 host->cdns_ufs_dme_attr_val[7]);
92 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
93 host->cdns_ufs_dme_attr_val[8]);
94 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
95 host->cdns_ufs_dme_attr_val[9]);
96 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTMODE),
97 host->cdns_ufs_dme_attr_val[10]);
98 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
99 host->cdns_ufs_dme_attr_val[11]);
103 * Sets HCLKDIV register value based on the core_clk
104 * @hba: host controller instance
106 * Return zero for success and non-zero for failure
108 static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
110 struct ufs_clk_info *clki;
111 struct list_head *head = &hba->clk_list_head;
112 unsigned long core_clk_rate = 0;
113 u32 core_clk_div = 0;
115 if (list_empty(head))
116 return 0;
118 list_for_each_entry(clki, head, list) {
119 if (IS_ERR_OR_NULL(clki->clk))
120 continue;
121 if (!strcmp(clki->name, "core_clk"))
122 core_clk_rate = clk_get_rate(clki->clk);
125 if (!core_clk_rate) {
126 dev_err(hba->dev, "%s: unable to find core_clk rate\n",
127 __func__);
128 return -EINVAL;
131 core_clk_div = core_clk_rate / USEC_PER_SEC;
133 ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
135 * Make sure the register was updated,
136 * UniPro layer will not work with an incorrect value.
138 mb();
140 return 0;
144 * Called before and after HCE enable bit is set.
145 * @hba: host controller instance
146 * @status: notify stage (pre, post change)
148 * Return zero for success and non-zero for failure
150 static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
151 enum ufs_notify_change_status status)
153 if (status != PRE_CHANGE)
154 return 0;
156 return cdns_ufs_set_hclkdiv(hba);
160 * Called around hibern8 enter/exit.
161 * @hba: host controller instance
162 * @cmd: UIC Command
163 * @status: notify stage (pre, post change)
166 static void cdns_ufs_hibern8_notify(struct ufs_hba *hba, enum uic_cmd_dme cmd,
167 enum ufs_notify_change_status status)
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);
176 * Called before and after Link startup is carried out.
177 * @hba: host controller instance
178 * @status: notify stage (pre, post change)
180 * Return zero for success and non-zero for failure
182 static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
183 enum ufs_notify_change_status status)
185 if (status != PRE_CHANGE)
186 return 0;
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.
195 ufshcd_disable_host_tx_lcc(hba);
198 * Disabling Autohibern8 feature in cadence UFS
199 * to mask unexpected interrupt trigger.
201 hba->ahit = 0;
203 return 0;
207 * cdns_ufs_init - performs additional ufs initialization
208 * @hba: host controller instance
210 * Returns status of initialization
212 static int cdns_ufs_init(struct ufs_hba *hba)
214 int status = 0;
215 struct cdns_ufs_host *host;
216 struct device *dev = hba->dev;
218 host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
220 if (!host)
221 return -ENOMEM;
222 ufshcd_set_variant(hba, host);
224 status = ufshcd_vops_phy_initialization(hba);
226 return status;
230 * cdns_ufs_m31_16nm_phy_initialization - performs m31 phy initialization
231 * @hba: host controller instance
233 * Always returns 0
235 static int cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba *hba)
237 u32 data;
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);
244 return 0;
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,
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,
264 static const struct of_device_id cdns_ufs_of_match[] = {
266 .compatible = "cdns,ufshc",
267 .data = &cdns_ufs_pltfm_hba_vops,
270 .compatible = "cdns,ufshc-m31-16nm",
271 .data = &cdns_ufs_m31_16nm_pltfm_hba_vops,
273 { },
276 MODULE_DEVICE_TABLE(of, cdns_ufs_of_match);
279 * cdns_ufs_pltfrm_probe - probe routine of the driver
280 * @pdev: pointer to platform device handle
282 * Return zero for success and non-zero for failure
284 static int cdns_ufs_pltfrm_probe(struct platform_device *pdev)
286 int err;
287 const struct of_device_id *of_id;
288 struct ufs_hba_variant_ops *vops;
289 struct device *dev = &pdev->dev;
291 of_id = of_match_node(cdns_ufs_of_match, dev->of_node);
292 vops = (struct ufs_hba_variant_ops *)of_id->data;
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);
299 return err;
303 * cdns_ufs_pltfrm_remove - removes the ufs driver
304 * @pdev: pointer to platform device handle
306 * Always returns 0
308 static int cdns_ufs_pltfrm_remove(struct platform_device *pdev)
310 struct ufs_hba *hba = platform_get_drvdata(pdev);
312 ufshcd_remove(hba);
313 return 0;
316 static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
317 .suspend = ufshcd_pltfrm_suspend,
318 .resume = ufshcd_pltfrm_resume,
319 .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
320 .runtime_resume = ufshcd_pltfrm_runtime_resume,
321 .runtime_idle = ufshcd_pltfrm_runtime_idle,
324 static struct platform_driver cdns_ufs_pltfrm_driver = {
325 .probe = cdns_ufs_pltfrm_probe,
326 .remove = cdns_ufs_pltfrm_remove,
327 .shutdown = ufshcd_pltfrm_shutdown,
328 .driver = {
329 .name = "cdns-ufshcd",
330 .pm = &cdns_ufs_dev_pm_ops,
331 .of_match_table = cdns_ufs_of_match,
335 module_platform_driver(cdns_ufs_pltfrm_driver);
337 MODULE_AUTHOR("Jan Kotas <jank@cadence.com>");
338 MODULE_DESCRIPTION("Cadence UFS host controller platform driver");
339 MODULE_LICENSE("GPL v2");
340 MODULE_VERSION(UFSHCD_DRIVER_VERSION);