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