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Linux/drivers/usb/phy/phy-omap-otg.c

  1 /*
  2  * OMAP OTG controller driver
  3  *
  4  * Based on code from tahvo-usb.c and isp1301_omap.c drivers.
  5  *
  6  * Copyright (C) 2005-2006 Nokia Corporation
  7  * Copyright (C) 2004 Texas Instruments
  8  * Copyright (C) 2004 David Brownell
  9  *
 10  * This file is subject to the terms and conditions of the GNU General
 11  * Public License. See the file "COPYING" in the main directory of this
 12  * archive for more details.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 17  * GNU General Public License for more details.
 18  */
 19 
 20 #include <linux/io.h>
 21 #include <linux/err.h>
 22 #include <linux/extcon.h>
 23 #include <linux/kernel.h>
 24 #include <linux/module.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/platform_data/usb-omap1.h>
 28 
 29 struct otg_device {
 30         void __iomem                    *base;
 31         bool                            id;
 32         bool                            vbus;
 33         struct extcon_specific_cable_nb vbus_dev;
 34         struct extcon_specific_cable_nb id_dev;
 35         struct notifier_block           vbus_nb;
 36         struct notifier_block           id_nb;
 37 };
 38 
 39 #define OMAP_OTG_CTRL           0x0c
 40 #define OMAP_OTG_ASESSVLD       (1 << 20)
 41 #define OMAP_OTG_BSESSEND       (1 << 19)
 42 #define OMAP_OTG_BSESSVLD       (1 << 18)
 43 #define OMAP_OTG_VBUSVLD        (1 << 17)
 44 #define OMAP_OTG_ID             (1 << 16)
 45 #define OMAP_OTG_XCEIV_OUTPUTS \
 46         (OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \
 47          OMAP_OTG_VBUSVLD  | OMAP_OTG_ID)
 48 
 49 static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs)
 50 {
 51         u32 l;
 52 
 53         l = readl(otg_dev->base + OMAP_OTG_CTRL);
 54         l &= ~OMAP_OTG_XCEIV_OUTPUTS;
 55         l |= outputs;
 56         writel(l, otg_dev->base + OMAP_OTG_CTRL);
 57 }
 58 
 59 static void omap_otg_set_mode(struct otg_device *otg_dev)
 60 {
 61         if (!otg_dev->id && otg_dev->vbus)
 62                 /* Set B-session valid. */
 63                 omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD);
 64         else if (otg_dev->vbus)
 65                 /* Set A-session valid. */
 66                 omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD);
 67         else if (!otg_dev->id)
 68                 /* Set B-session end to indicate no VBUS. */
 69                 omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND);
 70 }
 71 
 72 static int omap_otg_id_notifier(struct notifier_block *nb,
 73                                 unsigned long event, void *ptr)
 74 {
 75         struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb);
 76 
 77         otg_dev->id = event;
 78         omap_otg_set_mode(otg_dev);
 79 
 80         return NOTIFY_DONE;
 81 }
 82 
 83 static int omap_otg_vbus_notifier(struct notifier_block *nb,
 84                                   unsigned long event, void *ptr)
 85 {
 86         struct otg_device *otg_dev = container_of(nb, struct otg_device,
 87                                                   vbus_nb);
 88 
 89         otg_dev->vbus = event;
 90         omap_otg_set_mode(otg_dev);
 91 
 92         return NOTIFY_DONE;
 93 }
 94 
 95 static int omap_otg_probe(struct platform_device *pdev)
 96 {
 97         const struct omap_usb_config *config = pdev->dev.platform_data;
 98         struct otg_device *otg_dev;
 99         struct extcon_dev *extcon;
100         int ret;
101         u32 rev;
102 
103         if (!config || !config->extcon)
104                 return -ENODEV;
105 
106         extcon = extcon_get_extcon_dev(config->extcon);
107         if (!extcon)
108                 return -EPROBE_DEFER;
109 
110         otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL);
111         if (!otg_dev)
112                 return -ENOMEM;
113 
114         otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
115         if (IS_ERR(otg_dev->base))
116                 return PTR_ERR(otg_dev->base);
117 
118         otg_dev->id_nb.notifier_call = omap_otg_id_notifier;
119         otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier;
120 
121         ret = extcon_register_interest(&otg_dev->id_dev, config->extcon,
122                                        "USB-HOST", &otg_dev->id_nb);
123         if (ret)
124                 return ret;
125 
126         ret = extcon_register_interest(&otg_dev->vbus_dev, config->extcon,
127                                        "USB", &otg_dev->vbus_nb);
128         if (ret) {
129                 extcon_unregister_interest(&otg_dev->id_dev);
130                 return ret;
131         }
132 
133         otg_dev->id = extcon_get_cable_state(extcon, "USB-HOST");
134         otg_dev->vbus = extcon_get_cable_state(extcon, "USB");
135         omap_otg_set_mode(otg_dev);
136 
137         rev = readl(otg_dev->base);
138 
139         dev_info(&pdev->dev,
140                  "OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n",
141                  (rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id,
142                  otg_dev->vbus);
143 
144         return 0;
145 }
146 
147 static int omap_otg_remove(struct platform_device *pdev)
148 {
149         struct otg_device *otg_dev = platform_get_drvdata(pdev);
150 
151         extcon_unregister_interest(&otg_dev->id_dev);
152         extcon_unregister_interest(&otg_dev->vbus_dev);
153 
154         return 0;
155 }
156 
157 static struct platform_driver omap_otg_driver = {
158         .probe          = omap_otg_probe,
159         .remove         = omap_otg_remove,
160         .driver         = {
161                 .owner  = THIS_MODULE,
162                 .name   = "omap_otg",
163         },
164 };
165 module_platform_driver(omap_otg_driver);
166 
167 MODULE_DESCRIPTION("OMAP USB OTG controller driver");
168 MODULE_LICENSE("GPL");
169 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
170 

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