Merge remote-tracking branch 'asoc/topic/component' into asoc-next
[deliverable/linux.git] / drivers / scsi / ufs / ufshcd-pltfrm.c
1 /*
2 * Universal Flash Storage Host controller Platform bus based glue driver
3 *
4 * This code is based on drivers/scsi/ufs/ufshcd-pltfrm.c
5 * Copyright (C) 2011-2013 Samsung India Software Operations
6 *
7 * Authors:
8 * Santosh Yaraganavi <santosh.sy@samsung.com>
9 * Vinayak Holikatti <h.vinayak@samsung.com>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
15 * See the COPYING file in the top-level directory or visit
16 * <http://www.gnu.org/licenses/gpl-2.0.html>
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * This program is provided "AS IS" and "WITH ALL FAULTS" and
24 * without warranty of any kind. You are solely responsible for
25 * determining the appropriateness of using and distributing
26 * the program and assume all risks associated with your exercise
27 * of rights with respect to the program, including but not limited
28 * to infringement of third party rights, the risks and costs of
29 * program errors, damage to or loss of data, programs or equipment,
30 * and unavailability or interruption of operations. Under no
31 * circumstances will the contributor of this Program be liable for
32 * any damages of any kind arising from your use or distribution of
33 * this program.
34 */
35
36 #include <linux/platform_device.h>
37 #include <linux/pm_runtime.h>
38
39 #include "ufshcd.h"
40
41 #ifdef CONFIG_PM
42 /**
43 * ufshcd_pltfrm_suspend - suspend power management function
44 * @dev: pointer to device handle
45 *
46 *
47 * Returns 0
48 */
49 static int ufshcd_pltfrm_suspend(struct device *dev)
50 {
51 struct platform_device *pdev = to_platform_device(dev);
52 struct ufs_hba *hba = platform_get_drvdata(pdev);
53
54 /*
55 * TODO:
56 * 1. Call ufshcd_suspend
57 * 2. Do bus specific power management
58 */
59
60 disable_irq(hba->irq);
61
62 return 0;
63 }
64
65 /**
66 * ufshcd_pltfrm_resume - resume power management function
67 * @dev: pointer to device handle
68 *
69 * Returns 0
70 */
71 static int ufshcd_pltfrm_resume(struct device *dev)
72 {
73 struct platform_device *pdev = to_platform_device(dev);
74 struct ufs_hba *hba = platform_get_drvdata(pdev);
75
76 /*
77 * TODO:
78 * 1. Call ufshcd_resume.
79 * 2. Do bus specific wake up
80 */
81
82 enable_irq(hba->irq);
83
84 return 0;
85 }
86 #else
87 #define ufshcd_pltfrm_suspend NULL
88 #define ufshcd_pltfrm_resume NULL
89 #endif
90
91 #ifdef CONFIG_PM_RUNTIME
92 static int ufshcd_pltfrm_runtime_suspend(struct device *dev)
93 {
94 struct ufs_hba *hba = dev_get_drvdata(dev);
95
96 if (!hba)
97 return 0;
98
99 return ufshcd_runtime_suspend(hba);
100 }
101 static int ufshcd_pltfrm_runtime_resume(struct device *dev)
102 {
103 struct ufs_hba *hba = dev_get_drvdata(dev);
104
105 if (!hba)
106 return 0;
107
108 return ufshcd_runtime_resume(hba);
109 }
110 static int ufshcd_pltfrm_runtime_idle(struct device *dev)
111 {
112 struct ufs_hba *hba = dev_get_drvdata(dev);
113
114 if (!hba)
115 return 0;
116
117 return ufshcd_runtime_idle(hba);
118 }
119 #else /* !CONFIG_PM_RUNTIME */
120 #define ufshcd_pltfrm_runtime_suspend NULL
121 #define ufshcd_pltfrm_runtime_resume NULL
122 #define ufshcd_pltfrm_runtime_idle NULL
123 #endif /* CONFIG_PM_RUNTIME */
124
125 /**
126 * ufshcd_pltfrm_probe - probe routine of the driver
127 * @pdev: pointer to Platform device handle
128 *
129 * Returns 0 on success, non-zero value on failure
130 */
131 static int ufshcd_pltfrm_probe(struct platform_device *pdev)
132 {
133 struct ufs_hba *hba;
134 void __iomem *mmio_base;
135 struct resource *mem_res;
136 int irq, err;
137 struct device *dev = &pdev->dev;
138
139 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
140 mmio_base = devm_ioremap_resource(dev, mem_res);
141 if (IS_ERR(mmio_base)) {
142 err = PTR_ERR(mmio_base);
143 goto out;
144 }
145
146 irq = platform_get_irq(pdev, 0);
147 if (irq < 0) {
148 dev_err(dev, "IRQ resource not available\n");
149 err = -ENODEV;
150 goto out;
151 }
152
153 pm_runtime_set_active(&pdev->dev);
154 pm_runtime_enable(&pdev->dev);
155
156 err = ufshcd_init(dev, &hba, mmio_base, irq);
157 if (err) {
158 dev_err(dev, "Intialization failed\n");
159 goto out_disable_rpm;
160 }
161
162 platform_set_drvdata(pdev, hba);
163
164 return 0;
165
166 out_disable_rpm:
167 pm_runtime_disable(&pdev->dev);
168 pm_runtime_set_suspended(&pdev->dev);
169 out:
170 return err;
171 }
172
173 /**
174 * ufshcd_pltfrm_remove - remove platform driver routine
175 * @pdev: pointer to platform device handle
176 *
177 * Returns 0 on success, non-zero value on failure
178 */
179 static int ufshcd_pltfrm_remove(struct platform_device *pdev)
180 {
181 struct ufs_hba *hba = platform_get_drvdata(pdev);
182
183 pm_runtime_get_sync(&(pdev)->dev);
184 ufshcd_remove(hba);
185 return 0;
186 }
187
188 static const struct of_device_id ufs_of_match[] = {
189 { .compatible = "jedec,ufs-1.1"},
190 {},
191 };
192
193 static const struct dev_pm_ops ufshcd_dev_pm_ops = {
194 .suspend = ufshcd_pltfrm_suspend,
195 .resume = ufshcd_pltfrm_resume,
196 .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
197 .runtime_resume = ufshcd_pltfrm_runtime_resume,
198 .runtime_idle = ufshcd_pltfrm_runtime_idle,
199 };
200
201 static struct platform_driver ufshcd_pltfrm_driver = {
202 .probe = ufshcd_pltfrm_probe,
203 .remove = ufshcd_pltfrm_remove,
204 .driver = {
205 .name = "ufshcd",
206 .owner = THIS_MODULE,
207 .pm = &ufshcd_dev_pm_ops,
208 .of_match_table = ufs_of_match,
209 },
210 };
211
212 module_platform_driver(ufshcd_pltfrm_driver);
213
214 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
215 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
216 MODULE_DESCRIPTION("UFS host controller Pltform bus based glue driver");
217 MODULE_LICENSE("GPL");
218 MODULE_VERSION(UFSHCD_DRIVER_VERSION);
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