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_dev *extcon; 34 struct notifier_block vbus_nb; 35 struct notifier_block id_nb; 36 }; 37 38 #define OMAP_OTG_CTRL 0x0c 39 #define OMAP_OTG_ASESSVLD (1 << 20) 40 #define OMAP_OTG_BSESSEND (1 << 19) 41 #define OMAP_OTG_BSESSVLD (1 << 18) 42 #define OMAP_OTG_VBUSVLD (1 << 17) 43 #define OMAP_OTG_ID (1 << 16) 44 #define OMAP_OTG_XCEIV_OUTPUTS \ 45 (OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \ 46 OMAP_OTG_VBUSVLD | OMAP_OTG_ID) 47 48 static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs) 49 { 50 u32 l; 51 52 l = readl(otg_dev->base + OMAP_OTG_CTRL); 53 l &= ~OMAP_OTG_XCEIV_OUTPUTS; 54 l |= outputs; 55 writel(l, otg_dev->base + OMAP_OTG_CTRL); 56 } 57 58 static void omap_otg_set_mode(struct otg_device *otg_dev) 59 { 60 if (!otg_dev->id && otg_dev->vbus) 61 /* Set B-session valid. */ 62 omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD); 63 else if (otg_dev->vbus) 64 /* Set A-session valid. */ 65 omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD); 66 else if (!otg_dev->id) 67 /* Set B-session end to indicate no VBUS. */ 68 omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND); 69 } 70 71 static int omap_otg_id_notifier(struct notifier_block *nb, 72 unsigned long event, void *ptr) 73 { 74 struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb); 75 76 otg_dev->id = event; 77 omap_otg_set_mode(otg_dev); 78 79 return NOTIFY_DONE; 80 } 81 82 static int omap_otg_vbus_notifier(struct notifier_block *nb, 83 unsigned long event, void *ptr) 84 { 85 struct otg_device *otg_dev = container_of(nb, struct otg_device, 86 vbus_nb); 87 88 otg_dev->vbus = event; 89 omap_otg_set_mode(otg_dev); 90 91 return NOTIFY_DONE; 92 } 93 94 static int omap_otg_probe(struct platform_device *pdev) 95 { 96 const struct omap_usb_config *config = pdev->dev.platform_data; 97 struct otg_device *otg_dev; 98 struct extcon_dev *extcon; 99 int ret; 100 u32 rev; 101 102 if (!config || !config->extcon) 103 return -ENODEV; 104 105 extcon = extcon_get_extcon_dev(config->extcon); 106 if (!extcon) 107 return -EPROBE_DEFER; 108 109 otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL); 110 if (!otg_dev) 111 return -ENOMEM; 112 113 otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]); 114 if (IS_ERR(otg_dev->base)) 115 return PTR_ERR(otg_dev->base); 116 117 otg_dev->extcon = extcon; 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_notifier(extcon, EXTCON_USB_HOST, &otg_dev->id_nb); 122 if (ret) 123 return ret; 124 125 ret = extcon_register_notifier(extcon, EXTCON_USB, &otg_dev->vbus_nb); 126 if (ret) { 127 extcon_unregister_notifier(extcon, EXTCON_USB_HOST, 128 &otg_dev->id_nb); 129 return ret; 130 } 131 132 otg_dev->id = extcon_get_cable_state_(extcon, EXTCON_USB_HOST); 133 otg_dev->vbus = extcon_get_cable_state_(extcon, EXTCON_USB); 134 omap_otg_set_mode(otg_dev); 135 136 rev = readl(otg_dev->base); 137 138 dev_info(&pdev->dev, 139 "OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n", 140 (rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id, 141 otg_dev->vbus); 142 143 return 0; 144 } 145 146 static int omap_otg_remove(struct platform_device *pdev) 147 { 148 struct otg_device *otg_dev = platform_get_drvdata(pdev); 149 struct extcon_dev *edev = otg_dev->extcon; 150 151 extcon_unregister_notifier(edev, EXTCON_USB_HOST,&otg_dev->id_nb); 152 extcon_unregister_notifier(edev, EXTCON_USB, &otg_dev->vbus_nb); 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 .name = "omap_otg", 162 }, 163 }; 164 module_platform_driver(omap_otg_driver); 165 166 MODULE_DESCRIPTION("OMAP USB OTG controller driver"); 167 MODULE_LICENSE("GPL"); 168 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); 169