// SPDX-License-Identifier: GPL-2.0+ /* * twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver. * * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com * * Author: Hema HK */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* usb register definitions */ #define USB_VENDOR_ID_LSB 0x00 #define USB_VENDOR_ID_MSB 0x01 #define USB_PRODUCT_ID_LSB 0x02 #define USB_PRODUCT_ID_MSB 0x03 #define USB_VBUS_CTRL_SET 0x04 #define USB_VBUS_CTRL_CLR 0x05 #define USB_ID_CTRL_SET 0x06 #define USB_ID_CTRL_CLR 0x07 #define USB_VBUS_INT_SRC 0x08 #define USB_VBUS_INT_LATCH_SET 0x09 #define USB_VBUS_INT_LATCH_CLR 0x0A #define USB_VBUS_INT_EN_LO_SET 0x0B #define USB_VBUS_INT_EN_LO_CLR 0x0C #define USB_VBUS_INT_EN_HI_SET 0x0D #define USB_VBUS_INT_EN_HI_CLR 0x0E #define USB_ID_INT_SRC 0x0F #define USB_ID_INT_LATCH_SET 0x10 #define USB_ID_INT_LATCH_CLR 0x11 #define USB_ID_INT_EN_LO_SET 0x12 #define USB_ID_INT_EN_LO_CLR 0x13 #define USB_ID_INT_EN_HI_SET 0x14 #define USB_ID_INT_EN_HI_CLR 0x15 #define USB_OTG_ADP_CTRL 0x16 #define USB_OTG_ADP_HIGH 0x17 #define USB_OTG_ADP_LOW 0x18 #define USB_OTG_ADP_RISE 0x19 #define USB_OTG_REVISION 0x1A /* to be moved to LDO */ #define TWL6030_MISC2 0xE5 #define TWL6030_CFG_LDO_PD2 0xF5 #define TWL6030_BACKUP_REG 0xFA #define STS_HW_CONDITIONS 0x21 /* In module TWL6030_MODULE_PM_MASTER */ #define STS_HW_CONDITIONS 0x21 #define STS_USB_ID BIT(2) /* In module TWL6030_MODULE_PM_RECEIVER */ #define VUSB_CFG_TRANS 0x71 #define VUSB_CFG_STATE 0x72 #define VUSB_CFG_VOLTAGE 0x73 /* in module TWL6030_MODULE_MAIN_CHARGE */ #define CHARGERUSB_CTRL1 0x8 #define CONTROLLER_STAT1 0x03 #define VBUS_DET BIT(2) struct twl6030_usb { struct phy_companion comparator; struct device *dev; /* for vbus reporting with irqs disabled */ spinlock_t lock; struct regulator *usb3v3; /* used to check initial cable status after probe */ struct delayed_work get_status_work; /* used to set vbus, in atomic path */ struct work_struct set_vbus_work; int irq1; int irq2; enum musb_vbus_id_status linkstat; u8 asleep; bool vbus_enable; }; #define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator) /*-------------------------------------------------------------------------*/ static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module, u8 data, u8 address) { int ret = 0; ret = twl_i2c_write_u8(module, data, address); if (ret < 0) dev_err(twl->dev, "Write[0x%x] Error %d\n", address, ret); return ret; } static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address) { u8 data; int ret; ret = twl_i2c_read_u8(module, &data, address); if (ret >= 0) ret = data; else dev_err(twl->dev, "readb[0x%x,0x%x] Error %d\n", module, address, ret); return ret; } static int twl6030_start_srp(struct phy_companion *comparator) { struct twl6030_usb *twl = comparator_to_twl(comparator); twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET); twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET); mdelay(100); twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR); return 0; } static int twl6030_usb_ldo_init(struct twl6030_usb *twl) { /* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */ twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_BACKUP_REG); /* Program CFG_LDO_PD2 register and set VUSB bit */ twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_CFG_LDO_PD2); /* Program MISC2 register and set bit VUSB_IN_VBAT */ twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x10, TWL6030_MISC2); twl->usb3v3 = regulator_get(twl->dev, "usb"); if (IS_ERR(twl->usb3v3)) return -ENODEV; /* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */ twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET); /* * Program the USB_ID_CTRL_SET register to enable GND drive * and the ID comparators */ twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET); return 0; } static ssize_t vbus_show(struct device *dev, struct device_attribute *attr, char *buf) { struct twl6030_usb *twl = dev_get_drvdata(dev); unsigned long flags; int ret = -EINVAL; spin_lock_irqsave(&twl->lock, flags); switch (twl->linkstat) { case MUSB_VBUS_VALID: ret = sysfs_emit(buf, "vbus\n"); break; case MUSB_ID_GROUND: ret = sysfs_emit(buf, "id\n"); break; case MUSB_VBUS_OFF: ret = sysfs_emit(buf, "none\n"); break; default: ret = sysfs_emit(buf, "UNKNOWN\n"); } spin_unlock_irqrestore(&twl->lock, flags); return ret; } static DEVICE_ATTR_RO(vbus); static struct attribute *twl6030_attrs[] = { &dev_attr_vbus.attr, NULL, }; ATTRIBUTE_GROUPS(twl6030); static irqreturn_t twl6030_usb_irq(int irq, void *_twl) { struct twl6030_usb *twl = _twl; enum musb_vbus_id_status status = MUSB_UNKNOWN; u8 vbus_state, hw_state; int ret; hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS); vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE, CONTROLLER_STAT1); if (!(hw_state & STS_USB_ID)) { if (vbus_state & VBUS_DET) { ret = regulator_enable(twl->usb3v3); if (ret) dev_err(twl->dev, "Failed to enable usb3v3\n"); twl->asleep = 1; status = MUSB_VBUS_VALID; twl->linkstat = status; ret = musb_mailbox(status); if (ret) twl->linkstat = MUSB_UNKNOWN; } else { if (twl->linkstat != MUSB_UNKNOWN) { status = MUSB_VBUS_OFF; twl->linkstat = status; ret = musb_mailbox(status); if (ret) twl->linkstat = MUSB_UNKNOWN; if (twl->asleep) { regulator_disable(twl->usb3v3); twl->asleep = 0; } } } } sysfs_notify(&twl->dev->kobj, NULL, "vbus"); return IRQ_HANDLED; } static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl) { struct twl6030_usb *twl = _twl; enum musb_vbus_id_status status = MUSB_UNKNOWN; u8 hw_state; int ret; hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS); if (hw_state & STS_USB_ID) { ret = regulator_enable(twl->usb3v3); if (ret) dev_err(twl->dev, "Failed to enable usb3v3\n"); twl->asleep = 1; twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR); twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET); status = MUSB_ID_GROUND; twl->linkstat = status; ret = musb_mailbox(status); if (ret) twl->linkstat = MUSB_UNKNOWN; } else { twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR); twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET); } twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR); return IRQ_HANDLED; } static void twl6030_status_work(struct work_struct *work) { struct twl6030_usb *twl = container_of(work, struct twl6030_usb, get_status_work.work); twl6030_usb_irq(twl->irq2, twl); twl6030_usbotg_irq(twl->irq1, twl); } static int twl6030_enable_irq(struct twl6030_usb *twl) { twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET); twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C); twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C); twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK, REG_INT_MSK_LINE_C); twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK, REG_INT_MSK_STS_C); return 0; } static void otg_set_vbus_work(struct work_struct *data) { struct twl6030_usb *twl = container_of(data, struct twl6030_usb, set_vbus_work); /* * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1 * register. This enables boost mode. */ if (twl->vbus_enable) twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x40, CHARGERUSB_CTRL1); else twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x00, CHARGERUSB_CTRL1); } static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled) { struct twl6030_usb *twl = comparator_to_twl(comparator); twl->vbus_enable = enabled; schedule_work(&twl->set_vbus_work); return 0; } static int twl6030_usb_probe(struct platform_device *pdev) { u32 ret; struct twl6030_usb *twl; int status, err; struct device_node *np = pdev->dev.of_node; struct device *dev = &pdev->dev; if (!np) { dev_err(dev, "no DT info\n"); return -EINVAL; } twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL); if (!twl) return -ENOMEM; twl->dev = &pdev->dev; twl->irq1 = platform_get_irq(pdev, 0); twl->irq2 = platform_get_irq(pdev, 1); twl->linkstat = MUSB_UNKNOWN; if (twl->irq1 < 0) return twl->irq1; if (twl->irq2 < 0) return twl->irq2; twl->comparator.set_vbus = twl6030_set_vbus; twl->comparator.start_srp = twl6030_start_srp; ret = omap_usb2_set_comparator(&twl->comparator); if (ret == -ENODEV) { dev_info(&pdev->dev, "phy not ready, deferring probe"); return -EPROBE_DEFER; } /* init spinlock for workqueue */ spin_lock_init(&twl->lock); err = twl6030_usb_ldo_init(twl); if (err) { dev_err(&pdev->dev, "ldo init failed\n"); return err; } platform_set_drvdata(pdev, twl); INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work); INIT_DELAYED_WORK(&twl->get_status_work, twl6030_status_work); status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT, "twl6030_usb", twl); if (status < 0) { dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", twl->irq1, status); goto err_put_regulator; } status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT, "twl6030_usb", twl); if (status < 0) { dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", twl->irq2, status); goto err_free_irq1; } twl->asleep = 0; twl6030_enable_irq(twl); schedule_delayed_work(&twl->get_status_work, HZ); dev_info(&pdev->dev, "Initialized TWL6030 USB module\n"); return 0; err_free_irq1: free_irq(twl->irq1, twl); err_put_regulator: regulator_put(twl->usb3v3); return status; } static void twl6030_usb_remove(struct platform_device *pdev) { struct twl6030_usb *twl = platform_get_drvdata(pdev); cancel_delayed_work_sync(&twl->get_status_work); twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK, REG_INT_MSK_LINE_C); twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK, REG_INT_MSK_STS_C); free_irq(twl->irq1, twl); free_irq(twl->irq2, twl); regulator_put(twl->usb3v3); cancel_work_sync(&twl->set_vbus_work); } static const struct of_device_id twl6030_usb_id_table[] = { { .compatible = "ti,twl6030-usb" }, {} }; MODULE_DEVICE_TABLE(of, twl6030_usb_id_table); static struct platform_driver twl6030_usb_driver = { .probe = twl6030_usb_probe, .remove = twl6030_usb_remove, .driver = { .name = "twl6030_usb", .of_match_table = of_match_ptr(twl6030_usb_id_table), .dev_groups = twl6030_groups, }, }; static int __init twl6030_usb_init(void) { return platform_driver_register(&twl6030_usb_driver); } subsys_initcall(twl6030_usb_init); static void __exit twl6030_usb_exit(void) { platform_driver_unregister(&twl6030_usb_driver); } module_exit(twl6030_usb_exit); MODULE_ALIAS("platform:twl6030_usb"); MODULE_AUTHOR("Hema HK "); MODULE_DESCRIPTION("TWL6030 USB transceiver driver"); MODULE_LICENSE("GPL");