1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * UFS Host driver for Synopsys Designware Core
4 *
5 * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com)
6 *
7 * Authors: Joao Pinto <jpinto@synopsys.com>
8 */
9
10 #include "ufshcd.h"
11 #include "unipro.h"
12
13 #include "ufshcd-dwc.h"
14 #include "ufshci-dwc.h"
15
ufshcd_dwc_dme_set_attrs(struct ufs_hba * hba,const struct ufshcd_dme_attr_val * v,int n)16 int ufshcd_dwc_dme_set_attrs(struct ufs_hba *hba,
17 const struct ufshcd_dme_attr_val *v, int n)
18 {
19 int ret = 0;
20 int attr_node = 0;
21
22 for (attr_node = 0; attr_node < n; attr_node++) {
23 ret = ufshcd_dme_set_attr(hba, v[attr_node].attr_sel,
24 ATTR_SET_NOR, v[attr_node].mib_val, v[attr_node].peer);
25
26 if (ret)
27 return ret;
28 }
29
30 return 0;
31 }
32 EXPORT_SYMBOL(ufshcd_dwc_dme_set_attrs);
33
34 /**
35 * ufshcd_dwc_program_clk_div()
36 * This function programs the clk divider value. This value is needed to
37 * provide 1 microsecond tick to unipro layer.
38 * @hba: Private Structure pointer
39 * @divider_val: clock divider value to be programmed
40 *
41 */
ufshcd_dwc_program_clk_div(struct ufs_hba * hba,u32 divider_val)42 static void ufshcd_dwc_program_clk_div(struct ufs_hba *hba, u32 divider_val)
43 {
44 ufshcd_writel(hba, divider_val, DWC_UFS_REG_HCLKDIV);
45 }
46
47 /**
48 * ufshcd_dwc_link_is_up()
49 * Check if link is up
50 * @hba: private structure pointer
51 *
52 * Returns 0 on success, non-zero value on failure
53 */
ufshcd_dwc_link_is_up(struct ufs_hba * hba)54 static int ufshcd_dwc_link_is_up(struct ufs_hba *hba)
55 {
56 int dme_result = 0;
57
58 ufshcd_dme_get(hba, UIC_ARG_MIB(VS_POWERSTATE), &dme_result);
59
60 if (dme_result == UFSHCD_LINK_IS_UP) {
61 ufshcd_set_link_active(hba);
62 return 0;
63 }
64
65 return 1;
66 }
67
68 /**
69 * ufshcd_dwc_connection_setup()
70 * This function configures both the local side (host) and the peer side
71 * (device) unipro attributes to establish the connection to application/
72 * cport.
73 * This function is not required if the hardware is properly configured to
74 * have this connection setup on reset. But invoking this function does no
75 * harm and should be fine even working with any ufs device.
76 *
77 * @hba: pointer to drivers private data
78 *
79 * Returns 0 on success non-zero value on failure
80 */
ufshcd_dwc_connection_setup(struct ufs_hba * hba)81 static int ufshcd_dwc_connection_setup(struct ufs_hba *hba)
82 {
83 static const struct ufshcd_dme_attr_val setup_attrs[] = {
84 { UIC_ARG_MIB(T_CONNECTIONSTATE), 0, DME_LOCAL },
85 { UIC_ARG_MIB(N_DEVICEID), 0, DME_LOCAL },
86 { UIC_ARG_MIB(N_DEVICEID_VALID), 0, DME_LOCAL },
87 { UIC_ARG_MIB(T_PEERDEVICEID), 1, DME_LOCAL },
88 { UIC_ARG_MIB(T_PEERCPORTID), 0, DME_LOCAL },
89 { UIC_ARG_MIB(T_TRAFFICCLASS), 0, DME_LOCAL },
90 { UIC_ARG_MIB(T_CPORTFLAGS), 0x6, DME_LOCAL },
91 { UIC_ARG_MIB(T_CPORTMODE), 1, DME_LOCAL },
92 { UIC_ARG_MIB(T_CONNECTIONSTATE), 1, DME_LOCAL },
93 { UIC_ARG_MIB(T_CONNECTIONSTATE), 0, DME_PEER },
94 { UIC_ARG_MIB(N_DEVICEID), 1, DME_PEER },
95 { UIC_ARG_MIB(N_DEVICEID_VALID), 1, DME_PEER },
96 { UIC_ARG_MIB(T_PEERDEVICEID), 1, DME_PEER },
97 { UIC_ARG_MIB(T_PEERCPORTID), 0, DME_PEER },
98 { UIC_ARG_MIB(T_TRAFFICCLASS), 0, DME_PEER },
99 { UIC_ARG_MIB(T_CPORTFLAGS), 0x6, DME_PEER },
100 { UIC_ARG_MIB(T_CPORTMODE), 1, DME_PEER },
101 { UIC_ARG_MIB(T_CONNECTIONSTATE), 1, DME_PEER }
102 };
103
104 return ufshcd_dwc_dme_set_attrs(hba, setup_attrs, ARRAY_SIZE(setup_attrs));
105 }
106
107 /**
108 * ufshcd_dwc_link_startup_notify()
109 * UFS Host DWC specific link startup sequence
110 * @hba: private structure pointer
111 * @status: Callback notify status
112 *
113 * Returns 0 on success, non-zero value on failure
114 */
ufshcd_dwc_link_startup_notify(struct ufs_hba * hba,enum ufs_notify_change_status status)115 int ufshcd_dwc_link_startup_notify(struct ufs_hba *hba,
116 enum ufs_notify_change_status status)
117 {
118 int err = 0;
119
120 if (status == PRE_CHANGE) {
121 ufshcd_dwc_program_clk_div(hba, DWC_UFS_REG_HCLKDIV_DIV_125);
122
123 err = ufshcd_vops_phy_initialization(hba);
124 if (err) {
125 dev_err(hba->dev, "Phy setup failed (%d)\n", err);
126 goto out;
127 }
128 } else { /* POST_CHANGE */
129 err = ufshcd_dwc_link_is_up(hba);
130 if (err) {
131 dev_err(hba->dev, "Link is not up\n");
132 goto out;
133 }
134
135 err = ufshcd_dwc_connection_setup(hba);
136 if (err)
137 dev_err(hba->dev, "Connection setup failed (%d)\n",
138 err);
139 }
140
141 out:
142 return err;
143 }
144 EXPORT_SYMBOL(ufshcd_dwc_link_startup_notify);
145
146 MODULE_AUTHOR("Joao Pinto <Joao.Pinto@synopsys.com>");
147 MODULE_DESCRIPTION("UFS Host driver for Synopsys Designware Core");
148 MODULE_LICENSE("Dual BSD/GPL");
149