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 struct ufs_qcom_phy *phy_common = get_ufs_qcom_phy(generic_phy);
67 bool is_rate_B = false;
68 int ret;
69
70 if (phy_common->mode == PHY_MODE_UFS_HS_B)
71 is_rate_B = true;
72
73 ret = ufs_qcom_phy_qmp_20nm_phy_calibrate(phy_common, is_rate_B);
74 if (!ret)
75 /* phy calibrated, but yet to be started */
76 phy_common->is_started = false;
77
78 return ret;
79}
80
81static int ufs_qcom_phy_qmp_20nm_exit(struct phy *generic_phy)
82{
83 return 0;
84}
85
86static
87int ufs_qcom_phy_qmp_20nm_set_mode(struct phy *generic_phy, enum phy_mode mode)
88{
89 struct ufs_qcom_phy *phy_common = get_ufs_qcom_phy(generic_phy);
90
91 phy_common->mode = PHY_MODE_INVALID;
92
93 if (mode > 0)
94 phy_common->mode = mode;
95
96 return 0;
97}
98
99static
100void ufs_qcom_phy_qmp_20nm_power_control(struct ufs_qcom_phy *phy, bool val)
101{
102 bool hibern8_exit_after_pwr_collapse = phy->quirks &
103 UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE;
104
105 if (val) {
106 writel_relaxed(0x1, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
107 /*
108 * Before any transactions involving PHY, ensure PHY knows
109 * that it's analog rail is powered ON.
110 */
111 mb();
112
113 if (hibern8_exit_after_pwr_collapse) {
114 /*
115 * Give atleast 1us delay after restoring PHY analog
116 * power.
117 */
118 usleep_range(1, 2);
119 writel_relaxed(0x0A, phy->mmio +
120 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
121 writel_relaxed(0x08, phy->mmio +
122 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
123 /*
124 * Make sure workaround is deactivated before proceeding
125 * with normal PHY operations.
126 */
127 mb();
128 }
129 } else {
130 if (hibern8_exit_after_pwr_collapse) {
131 writel_relaxed(0x0A, phy->mmio +
132 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
133 writel_relaxed(0x02, phy->mmio +
134 QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
135 /*
136 * Make sure that above workaround is activated before
137 * PHY analog power collapse.
138 */
139 mb();
140 }
141
142 writel_relaxed(0x0, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
143 /*
144 * ensure that PHY knows its PHY analog rail is going
145 * to be powered down
146 */
147 mb();
148 }
149}
150
151static
152void ufs_qcom_phy_qmp_20nm_set_tx_lane_enable(struct ufs_qcom_phy *phy, u32 val)
153{
154 writel_relaxed(val & UFS_PHY_TX_LANE_ENABLE_MASK,
155 phy->mmio + UFS_PHY_TX_LANE_ENABLE);
156 mb();
157}
158
159static inline void ufs_qcom_phy_qmp_20nm_start_serdes(struct ufs_qcom_phy *phy)
160{
161 u32 tmp;
162
163 tmp = readl_relaxed(phy->mmio + UFS_PHY_PHY_START);
164 tmp &= ~MASK_SERDES_START;
165 tmp |= (1 << OFFSET_SERDES_START);
166 writel_relaxed(tmp, phy->mmio + UFS_PHY_PHY_START);
167 mb();
168}
169
170static int ufs_qcom_phy_qmp_20nm_is_pcs_ready(struct ufs_qcom_phy *phy_common)
171{
172 int err = 0;
173 u32 val;
174
175 err = readl_poll_timeout(phy_common->mmio + UFS_PHY_PCS_READY_STATUS,
176 val, (val & MASK_PCS_READY), 10, 1000000);
177 if (err)
178 dev_err(phy_common->dev, "%s: poll for pcs failed err = %d\n",
179 __func__, err);
180 return err;
181}
182
183static const struct phy_ops ufs_qcom_phy_qmp_20nm_phy_ops = {
184 .init = ufs_qcom_phy_qmp_20nm_init,
185 .exit = ufs_qcom_phy_qmp_20nm_exit,
186 .power_on = ufs_qcom_phy_power_on,
187 .power_off = ufs_qcom_phy_power_off,
188 .set_mode = ufs_qcom_phy_qmp_20nm_set_mode,
189 .owner = THIS_MODULE,
190};
191
192static struct ufs_qcom_phy_specific_ops phy_20nm_ops = {
193 .start_serdes = ufs_qcom_phy_qmp_20nm_start_serdes,
194 .is_physical_coding_sublayer_ready = ufs_qcom_phy_qmp_20nm_is_pcs_ready,
195 .set_tx_lane_enable = ufs_qcom_phy_qmp_20nm_set_tx_lane_enable,
196 .power_control = ufs_qcom_phy_qmp_20nm_power_control,
197};
198
199static int ufs_qcom_phy_qmp_20nm_probe(struct platform_device *pdev)
200{
201 struct device *dev = &pdev->dev;
202 struct phy *generic_phy;
203 struct ufs_qcom_phy_qmp_20nm *phy;
204 struct ufs_qcom_phy *phy_common;
205 int err = 0;
206
207 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
208 if (!phy) {
209 err = -ENOMEM;
210 goto out;
211 }
212 phy_common = &phy->common_cfg;
213
214 generic_phy = ufs_qcom_phy_generic_probe(pdev, phy_common,
215 &ufs_qcom_phy_qmp_20nm_phy_ops, &phy_20nm_ops);
216
217 if (!generic_phy) {
218 err = -EIO;
219 goto out;
220 }
221
222 err = ufs_qcom_phy_init_clks(phy_common);
223 if (err)
224 goto out;
225
226 err = ufs_qcom_phy_init_vregulators(phy_common);
227 if (err)
228 goto out;
229
230 ufs_qcom_phy_qmp_20nm_advertise_quirks(phy_common);
231
232 phy_set_drvdata(generic_phy, phy);
233
234 strlcpy(phy_common->name, UFS_PHY_NAME, sizeof(phy_common->name));
235
236out:
237 return err;
238}
239
240static const struct of_device_id ufs_qcom_phy_qmp_20nm_of_match[] = {
241 {.compatible = "qcom,ufs-phy-qmp-20nm"},
242 {},
243};
244MODULE_DEVICE_TABLE(of, ufs_qcom_phy_qmp_20nm_of_match);
245
246static struct platform_driver ufs_qcom_phy_qmp_20nm_driver = {
247 .probe = ufs_qcom_phy_qmp_20nm_probe,
248 .driver = {
249 .of_match_table = ufs_qcom_phy_qmp_20nm_of_match,
250 .name = "ufs_qcom_phy_qmp_20nm",
251 },
252};
253
254module_platform_driver(ufs_qcom_phy_qmp_20nm_driver);
255
256MODULE_DESCRIPTION("Universal Flash Storage (UFS) QCOM PHY QMP 20nm");
257MODULE_LICENSE("GPL v2");