Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 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; |
Chanwoo Choi | a2fd242 | 2015-07-01 13:11:31 +0900 | [diff] [blame] | 33 | struct extcon_dev *extcon; |
Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 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 | |
Aaro Koskinen | 2c2025b | 2015-10-27 23:26:33 +0200 | [diff] [blame] | 117 | otg_dev->extcon = extcon; |
Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 118 | otg_dev->id_nb.notifier_call = omap_otg_id_notifier; |
| 119 | otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier; |
| 120 | |
Chanwoo Choi | a2fd242 | 2015-07-01 13:11:31 +0900 | [diff] [blame] | 121 | ret = extcon_register_notifier(extcon, EXTCON_USB_HOST, &otg_dev->id_nb); |
Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 122 | if (ret) |
| 123 | return ret; |
| 124 | |
Chanwoo Choi | a2fd242 | 2015-07-01 13:11:31 +0900 | [diff] [blame] | 125 | ret = extcon_register_notifier(extcon, EXTCON_USB, &otg_dev->vbus_nb); |
Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 126 | if (ret) { |
Chanwoo Choi | a2fd242 | 2015-07-01 13:11:31 +0900 | [diff] [blame] | 127 | extcon_unregister_notifier(extcon, EXTCON_USB_HOST, |
| 128 | &otg_dev->id_nb); |
Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 129 | return ret; |
| 130 | } |
| 131 | |
Chanwoo Choi | a2fd242 | 2015-07-01 13:11:31 +0900 | [diff] [blame] | 132 | otg_dev->id = extcon_get_cable_state_(extcon, EXTCON_USB_HOST); |
| 133 | otg_dev->vbus = extcon_get_cable_state_(extcon, EXTCON_USB); |
Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 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); |
Chanwoo Choi | a2fd242 | 2015-07-01 13:11:31 +0900 | [diff] [blame] | 149 | struct extcon_dev *edev = otg_dev->extcon; |
Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 150 | |
Sandhya Bankar | 7c8b9c3 | 2016-05-31 08:59:44 -0400 | [diff] [blame] | 151 | extcon_unregister_notifier(edev, EXTCON_USB_HOST, &otg_dev->id_nb); |
Chanwoo Choi | a2fd242 | 2015-07-01 13:11:31 +0900 | [diff] [blame] | 152 | extcon_unregister_notifier(edev, EXTCON_USB, &otg_dev->vbus_nb); |
Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 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 = { |
Aaro Koskinen | 449d2ba | 2013-12-06 16:13:06 +0200 | [diff] [blame] | 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>"); |