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
19 static
ufs_qcom_phy_qmp_20nm_phy_calibrate(struct ufs_qcom_phy * ufs_qcom_phy,bool is_rate_B)20 int 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
53 out:
54 return err;
55 }
56
57 static
ufs_qcom_phy_qmp_20nm_advertise_quirks(struct ufs_qcom_phy * phy_common)58 void 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
ufs_qcom_phy_qmp_20nm_init(struct phy * generic_phy)64 static int ufs_qcom_phy_qmp_20nm_init(struct phy *generic_phy)
65 {
66 struct ufs_qcom_phy_qmp_20nm *phy = phy_get_drvdata(generic_phy);
67 struct ufs_qcom_phy *phy_common = &phy->common_cfg;
68 int err = 0;
69
70 err = ufs_qcom_phy_init_clks(generic_phy, phy_common);
71 if (err) {
72 dev_err(phy_common->dev, "%s: ufs_qcom_phy_init_clks() failed %d\n",
73 __func__, err);
74 goto out;
75 }
76
77 err = ufs_qcom_phy_init_vregulators(generic_phy, phy_common);
78 if (err) {
79 dev_err(phy_common->dev, "%s: ufs_qcom_phy_init_vregulators() failed %d\n",
80 __func__, err);
81 goto out;
82 }
83
84 ufs_qcom_phy_qmp_20nm_advertise_quirks(phy_common);
85
86 out:
87 return err;
88 }
89
90 static
ufs_qcom_phy_qmp_20nm_power_control(struct ufs_qcom_phy * phy,bool val)91 void ufs_qcom_phy_qmp_20nm_power_control(struct ufs_qcom_phy *phy, bool val)
92 {
93 bool hibern8_exit_after_pwr_collapse = phy->quirks &
94 UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE;
95
96 if (val) {
97 writel_relaxed(0x1, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
98 /*
99 * Before any transactions involving PHY, ensure PHY knows
100 * that it's analog rail is powered ON.
101 */
102 mb();
103
104 if (hibern8_exit_after_pwr_collapse) {
105 /*
106 * Give atleast 1us delay after restoring PHY analog
107 * power.
108 */
109 usleep_range(1, 2);
110 writel_relaxed(0x0A, phy->mmio +
111 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
112 writel_relaxed(0x08, phy->mmio +
113 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
114 /*
115 * Make sure workaround is deactivated before proceeding
116 * with normal PHY operations.
117 */
118 mb();
119 }
120 } else {
121 if (hibern8_exit_after_pwr_collapse) {
122 writel_relaxed(0x0A, phy->mmio +
123 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
124 writel_relaxed(0x02, phy->mmio +
125 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
126 /*
127 * Make sure that above workaround is activated before
128 * PHY analog power collapse.
129 */
130 mb();
131 }
132
133 writel_relaxed(0x0, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
134 /*
135 * ensure that PHY knows its PHY analog rail is going
136 * to be powered down
137 */
138 mb();
139 }
140 }
141
142 static
ufs_qcom_phy_qmp_20nm_set_tx_lane_enable(struct ufs_qcom_phy * phy,u32 val)143 void ufs_qcom_phy_qmp_20nm_set_tx_lane_enable(struct ufs_qcom_phy *phy, u32 val)
144 {
145 writel_relaxed(val & UFS_PHY_TX_LANE_ENABLE_MASK,
146 phy->mmio + UFS_PHY_TX_LANE_ENABLE);
147 mb();
148 }
149
ufs_qcom_phy_qmp_20nm_start_serdes(struct ufs_qcom_phy * phy)150 static inline void ufs_qcom_phy_qmp_20nm_start_serdes(struct ufs_qcom_phy *phy)
151 {
152 u32 tmp;
153
154 tmp = readl_relaxed(phy->mmio + UFS_PHY_PHY_START);
155 tmp &= ~MASK_SERDES_START;
156 tmp |= (1 << OFFSET_SERDES_START);
157 writel_relaxed(tmp, phy->mmio + UFS_PHY_PHY_START);
158 mb();
159 }
160
ufs_qcom_phy_qmp_20nm_is_pcs_ready(struct ufs_qcom_phy * phy_common)161 static int ufs_qcom_phy_qmp_20nm_is_pcs_ready(struct ufs_qcom_phy *phy_common)
162 {
163 int err = 0;
164 u32 val;
165
166 err = readl_poll_timeout(phy_common->mmio + UFS_PHY_PCS_READY_STATUS,
167 val, (val & MASK_PCS_READY), 10, 1000000);
168 if (err)
169 dev_err(phy_common->dev, "%s: poll for pcs failed err = %d\n",
170 __func__, err);
171 return err;
172 }
173
174 static const struct phy_ops ufs_qcom_phy_qmp_20nm_phy_ops = {
175 .init = ufs_qcom_phy_qmp_20nm_init,
176 .exit = ufs_qcom_phy_exit,
177 .power_on = ufs_qcom_phy_power_on,
178 .power_off = ufs_qcom_phy_power_off,
179 .owner = THIS_MODULE,
180 };
181
182 static struct ufs_qcom_phy_specific_ops phy_20nm_ops = {
183 .calibrate_phy = ufs_qcom_phy_qmp_20nm_phy_calibrate,
184 .start_serdes = ufs_qcom_phy_qmp_20nm_start_serdes,
185 .is_physical_coding_sublayer_ready = ufs_qcom_phy_qmp_20nm_is_pcs_ready,
186 .set_tx_lane_enable = ufs_qcom_phy_qmp_20nm_set_tx_lane_enable,
187 .power_control = ufs_qcom_phy_qmp_20nm_power_control,
188 };
189
ufs_qcom_phy_qmp_20nm_probe(struct platform_device * pdev)190 static int ufs_qcom_phy_qmp_20nm_probe(struct platform_device *pdev)
191 {
192 struct device *dev = &pdev->dev;
193 struct phy *generic_phy;
194 struct ufs_qcom_phy_qmp_20nm *phy;
195 int err = 0;
196
197 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
198 if (!phy) {
199 dev_err(dev, "%s: failed to allocate phy\n", __func__);
200 err = -ENOMEM;
201 goto out;
202 }
203
204 generic_phy = ufs_qcom_phy_generic_probe(pdev, &phy->common_cfg,
205 &ufs_qcom_phy_qmp_20nm_phy_ops, &phy_20nm_ops);
206
207 if (!generic_phy) {
208 dev_err(dev, "%s: ufs_qcom_phy_generic_probe() failed\n",
209 __func__);
210 err = -EIO;
211 goto out;
212 }
213
214 phy_set_drvdata(generic_phy, phy);
215
216 strlcpy(phy->common_cfg.name, UFS_PHY_NAME,
217 sizeof(phy->common_cfg.name));
218
219 out:
220 return err;
221 }
222
ufs_qcom_phy_qmp_20nm_remove(struct platform_device * pdev)223 static int ufs_qcom_phy_qmp_20nm_remove(struct platform_device *pdev)
224 {
225 struct device *dev = &pdev->dev;
226 struct phy *generic_phy = to_phy(dev);
227 struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
228 int err = 0;
229
230 err = ufs_qcom_phy_remove(generic_phy, ufs_qcom_phy);
231 if (err)
232 dev_err(dev, "%s: ufs_qcom_phy_remove failed = %d\n",
233 __func__, err);
234
235 return err;
236 }
237
238 static const struct of_device_id ufs_qcom_phy_qmp_20nm_of_match[] = {
239 {.compatible = "qcom,ufs-phy-qmp-20nm"},
240 {},
241 };
242 MODULE_DEVICE_TABLE(of, ufs_qcom_phy_qmp_20nm_of_match);
243
244 static struct platform_driver ufs_qcom_phy_qmp_20nm_driver = {
245 .probe = ufs_qcom_phy_qmp_20nm_probe,
246 .remove = ufs_qcom_phy_qmp_20nm_remove,
247 .driver = {
248 .of_match_table = ufs_qcom_phy_qmp_20nm_of_match,
249 .name = "ufs_qcom_phy_qmp_20nm",
250 },
251 };
252
253 module_platform_driver(ufs_qcom_phy_qmp_20nm_driver);
254
255 MODULE_DESCRIPTION("Universal Flash Storage (UFS) QCOM PHY QMP 20nm");
256 MODULE_LICENSE("GPL v2");
257