tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2013-2015, Linux Foundation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 */
14
15#include "phy-qcom-ufs-qmp-20nm.h"
16
17#define UFS_PHY_NAME "ufs_phy_qmp_20nm"
18
19static
20int ufs_qcom_phy_qmp_20nm_phy_calibrate(struct ufs_qcom_phy *ufs_qcom_phy,
21 bool is_rate_B)
22{
23 struct ufs_qcom_phy_calibration *tbl_A, *tbl_B;
24 int tbl_size_A, tbl_size_B;
25 u8 major = ufs_qcom_phy->host_ctrl_rev_major;
26 u16 minor = ufs_qcom_phy->host_ctrl_rev_minor;
27 u16 step = ufs_qcom_phy->host_ctrl_rev_step;
28 int err;
29
30 if ((major == 0x1) && (minor == 0x002) && (step == 0x0000)) {
31 tbl_size_A = ARRAY_SIZE(phy_cal_table_rate_A_1_2_0);
32 tbl_A = phy_cal_table_rate_A_1_2_0;
33 } else if ((major == 0x1) && (minor == 0x003) && (step == 0x0000)) {
34 tbl_size_A = ARRAY_SIZE(phy_cal_table_rate_A_1_3_0);
35 tbl_A = phy_cal_table_rate_A_1_3_0;
36 } else {
37 dev_err(ufs_qcom_phy->dev, "%s: Unknown UFS-PHY version, no calibration values\n",
38 __func__);
39 err = -ENODEV;
40 goto out;
41 }
42
43 tbl_size_B = ARRAY_SIZE(phy_cal_table_rate_B);
44 tbl_B = phy_cal_table_rate_B;
45
46 err = ufs_qcom_phy_calibrate(ufs_qcom_phy, tbl_A, tbl_size_A,
47 tbl_B, tbl_size_B, is_rate_B);
48
49 if (err)
50 dev_err(ufs_qcom_phy->dev, "%s: ufs_qcom_phy_calibrate() failed %d\n",
51 __func__, err);
52
53out:
54 return err;
55}
56
57static
58void ufs_qcom_phy_qmp_20nm_advertise_quirks(struct ufs_qcom_phy *phy_common)
59{
60 phy_common->quirks =
61 UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE;
62}
63
64static int ufs_qcom_phy_qmp_20nm_init(struct phy *generic_phy)
65{
66 return 0;
67}
68
69static int ufs_qcom_phy_qmp_20nm_exit(struct phy *generic_phy)
70{
71 return 0;
72}
73
74static
75void ufs_qcom_phy_qmp_20nm_power_control(struct ufs_qcom_phy *phy, bool val)
76{
77 bool hibern8_exit_after_pwr_collapse = phy->quirks &
78 UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE;
79
80 if (val) {
81 writel_relaxed(0x1, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
82 /*
83 * Before any transactions involving PHY, ensure PHY knows
84 * that it's analog rail is powered ON.
85 */
86 mb();
87
88 if (hibern8_exit_after_pwr_collapse) {
89 /*
90 * Give atleast 1us delay after restoring PHY analog
91 * power.
92 */
93 usleep_range(1, 2);
94 writel_relaxed(0x0A, phy->mmio +
95 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
96 writel_relaxed(0x08, phy->mmio +
97 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
98 /*
99 * Make sure workaround is deactivated before proceeding
100 * with normal PHY operations.
101 */
102 mb();
103 }
104 } else {
105 if (hibern8_exit_after_pwr_collapse) {
106 writel_relaxed(0x0A, phy->mmio +
107 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
108 writel_relaxed(0x02, phy->mmio +
109 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
110 /*
111 * Make sure that above workaround is activated before
112 * PHY analog power collapse.
113 */
114 mb();
115 }
116
117 writel_relaxed(0x0, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
118 /*
119 * ensure that PHY knows its PHY analog rail is going
120 * to be powered down
121 */
122 mb();
123 }
124}
125
126static
127void ufs_qcom_phy_qmp_20nm_set_tx_lane_enable(struct ufs_qcom_phy *phy, u32 val)
128{
129 writel_relaxed(val & UFS_PHY_TX_LANE_ENABLE_MASK,
130 phy->mmio + UFS_PHY_TX_LANE_ENABLE);
131 mb();
132}
133
134static inline void ufs_qcom_phy_qmp_20nm_start_serdes(struct ufs_qcom_phy *phy)
135{
136 u32 tmp;
137
138 tmp = readl_relaxed(phy->mmio + UFS_PHY_PHY_START);
139 tmp &= ~MASK_SERDES_START;
140 tmp |= (1 << OFFSET_SERDES_START);
141 writel_relaxed(tmp, phy->mmio + UFS_PHY_PHY_START);
142 mb();
143}
144
145static int ufs_qcom_phy_qmp_20nm_is_pcs_ready(struct ufs_qcom_phy *phy_common)
146{
147 int err = 0;
148 u32 val;
149
150 err = readl_poll_timeout(phy_common->mmio + UFS_PHY_PCS_READY_STATUS,
151 val, (val & MASK_PCS_READY), 10, 1000000);
152 if (err)
153 dev_err(phy_common->dev, "%s: poll for pcs failed err = %d\n",
154 __func__, err);
155 return err;
156}
157
158static const struct phy_ops ufs_qcom_phy_qmp_20nm_phy_ops = {
159 .init = ufs_qcom_phy_qmp_20nm_init,
160 .exit = ufs_qcom_phy_qmp_20nm_exit,
161 .power_on = ufs_qcom_phy_power_on,
162 .power_off = ufs_qcom_phy_power_off,
163 .owner = THIS_MODULE,
164};
165
166static struct ufs_qcom_phy_specific_ops phy_20nm_ops = {
167 .calibrate_phy = ufs_qcom_phy_qmp_20nm_phy_calibrate,
168 .start_serdes = ufs_qcom_phy_qmp_20nm_start_serdes,
169 .is_physical_coding_sublayer_ready = ufs_qcom_phy_qmp_20nm_is_pcs_ready,
170 .set_tx_lane_enable = ufs_qcom_phy_qmp_20nm_set_tx_lane_enable,
171 .power_control = ufs_qcom_phy_qmp_20nm_power_control,
172};
173
174static int ufs_qcom_phy_qmp_20nm_probe(struct platform_device *pdev)
175{
176 struct device *dev = &pdev->dev;
177 struct phy *generic_phy;
178 struct ufs_qcom_phy_qmp_20nm *phy;
179 struct ufs_qcom_phy *phy_common;
180 int err = 0;
181
182 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
183 if (!phy) {
184 err = -ENOMEM;
185 goto out;
186 }
187 phy_common = &phy->common_cfg;
188
189 generic_phy = ufs_qcom_phy_generic_probe(pdev, phy_common,
190 &ufs_qcom_phy_qmp_20nm_phy_ops, &phy_20nm_ops);
191
192 if (!generic_phy) {
193 err = -EIO;
194 goto out;
195 }
196
197 err = ufs_qcom_phy_init_clks(phy_common);
198 if (err)
199 goto out;
200
201 err = ufs_qcom_phy_init_vregulators(phy_common);
202 if (err)
203 goto out;
204
205 ufs_qcom_phy_qmp_20nm_advertise_quirks(phy_common);
206
207 phy_set_drvdata(generic_phy, phy);
208
209 strlcpy(phy_common->name, UFS_PHY_NAME, sizeof(phy_common->name));
210
211out:
212 return err;
213}
214
215static const struct of_device_id ufs_qcom_phy_qmp_20nm_of_match[] = {
216 {.compatible = "qcom,ufs-phy-qmp-20nm"},
217 {},
218};
219MODULE_DEVICE_TABLE(of, ufs_qcom_phy_qmp_20nm_of_match);
220
221static struct platform_driver ufs_qcom_phy_qmp_20nm_driver = {
222 .probe = ufs_qcom_phy_qmp_20nm_probe,
223 .driver = {
224 .of_match_table = ufs_qcom_phy_qmp_20nm_of_match,
225 .name = "ufs_qcom_phy_qmp_20nm",
226 },
227};
228
229module_platform_driver(ufs_qcom_phy_qmp_20nm_driver);
230
231MODULE_DESCRIPTION("Universal Flash Storage (UFS) QCOM PHY QMP 20nm");
232MODULE_LICENSE("GPL v2");