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
18int 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}
34EXPORT_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 */
42static 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 */
53static 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 */
80static 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 */
113int 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
139out:
140	return err;
141}
142EXPORT_SYMBOL(ufshcd_dwc_link_startup_notify);
143
144MODULE_AUTHOR("Joao Pinto <Joao.Pinto@synopsys.com>");
145MODULE_DESCRIPTION("UFS Host driver for Synopsys Designware Core");
146MODULE_LICENSE("Dual BSD/GPL");
147