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Linux/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);
219 

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