1 // SPDX-License-Identifier: GPL-2.0+
2 /**
3 * cdns-platform.c - Platform driver for Cadence UFSHCI device
4 *
5 * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
6 */
7
8 #include <clk.h>
9 #include <common.h>
10 #include <dm.h>
11 #include <ufs.h>
12 #include <asm/io.h>
13 #include <dm/device_compat.h>
14 #include <linux/bitops.h>
15 #include <linux/err.h>
16
17 #include "ufs.h"
18
19 #define USEC_PER_SEC 1000000L
20
21 #define CDNS_UFS_REG_HCLKDIV 0xFC
22 #define CDNS_UFS_REG_PHY_XCFGD1 0x113C
23
cdns_ufs_link_startup_notify(struct ufs_hba * hba,enum ufs_notify_change_status status)24 static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
25 enum ufs_notify_change_status status)
26 {
27 hba->quirks |= UFSHCD_QUIRK_BROKEN_LCC;
28 switch (status) {
29 case PRE_CHANGE:
30 return ufshcd_dme_set(hba,
31 UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
32 0);
33 case POST_CHANGE:
34 ;
35 }
36
37 return 0;
38 }
39
cdns_ufs_set_hclkdiv(struct ufs_hba * hba)40 static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
41 {
42 struct clk clk;
43 unsigned long core_clk_rate = 0;
44 u32 core_clk_div = 0;
45 int ret;
46
47 ret = clk_get_by_name(hba->dev, "core_clk", &clk);
48 if (ret) {
49 dev_err(hba->dev, "failed to get core_clk clock\n");
50 return ret;
51 }
52
53 core_clk_rate = clk_get_rate(&clk);
54 if (IS_ERR_VALUE(core_clk_rate)) {
55 dev_err(hba->dev, "%s: unable to find core_clk rate\n",
56 __func__);
57 return core_clk_rate;
58 }
59
60 core_clk_div = core_clk_rate / USEC_PER_SEC;
61 ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
62
63 return 0;
64 }
65
cdns_ufs_hce_enable_notify(struct ufs_hba * hba,enum ufs_notify_change_status status)66 static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
67 enum ufs_notify_change_status status)
68 {
69 switch (status) {
70 case PRE_CHANGE:
71 return cdns_ufs_set_hclkdiv(hba);
72 case POST_CHANGE:
73 ;
74 }
75
76 return 0;
77 }
78
cdns_ufs_init(struct ufs_hba * hba)79 static int cdns_ufs_init(struct ufs_hba *hba)
80 {
81 u32 data;
82
83 /* Increase RX_Advanced_Min_ActivateTime_Capability */
84 data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
85 data |= BIT(24);
86 ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
87
88 return 0;
89 }
90
91 static struct ufs_hba_ops cdns_pltfm_hba_ops = {
92 .init = cdns_ufs_init,
93 .hce_enable_notify = cdns_ufs_hce_enable_notify,
94 .link_startup_notify = cdns_ufs_link_startup_notify,
95 };
96
cdns_ufs_pltfm_probe(struct udevice * dev)97 static int cdns_ufs_pltfm_probe(struct udevice *dev)
98 {
99 int err = ufshcd_probe(dev, &cdns_pltfm_hba_ops);
100 if (err)
101 dev_err(dev, "ufshcd_probe() failed %d\n", err);
102
103 return err;
104 }
105
cdns_ufs_pltfm_bind(struct udevice * dev)106 static int cdns_ufs_pltfm_bind(struct udevice *dev)
107 {
108 struct udevice *scsi_dev;
109
110 return ufs_scsi_bind(dev, &scsi_dev);
111 }
112
113 static const struct udevice_id cdns_ufs_pltfm_ids[] = {
114 {
115 .compatible = "cdns,ufshc-m31-16nm",
116 },
117 {},
118 };
119
120 U_BOOT_DRIVER(cdns_ufs_pltfm) = {
121 .name = "cdns-ufs-pltfm",
122 .id = UCLASS_UFS,
123 .of_match = cdns_ufs_pltfm_ids,
124 .probe = cdns_ufs_pltfm_probe,
125 .bind = cdns_ufs_pltfm_bind,
126 };
127