diff options
Diffstat (limited to 'drivers/usb/phy/phy-twl6030-usb.c')
| -rw-r--r-- | drivers/usb/phy/phy-twl6030-usb.c | 458 |
1 files changed, 458 insertions, 0 deletions
diff --git a/drivers/usb/phy/phy-twl6030-usb.c b/drivers/usb/phy/phy-twl6030-usb.c new file mode 100644 index 0000000000..c3ce6b1054 --- /dev/null +++ b/drivers/usb/phy/phy-twl6030-usb.c @@ -0,0 +1,458 @@ +// 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 <hemahk@ti.com> + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/usb/musb.h> +#include <linux/usb/phy_companion.h> +#include <linux/phy/omap_usb.h> +#include <linux/mfd/twl.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/of.h> + +/* 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 = snprintf(buf, PAGE_SIZE, "vbus\n"); + break; + case MUSB_ID_GROUND: + ret = snprintf(buf, PAGE_SIZE, "id\n"); + break; + case MUSB_VBUS_OFF: + ret = snprintf(buf, PAGE_SIZE, "none\n"); + break; + default: + ret = snprintf(buf, PAGE_SIZE, "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_new = 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 <hemahk@ti.com>"); +MODULE_DESCRIPTION("TWL6030 USB transceiver driver"); +MODULE_LICENSE("GPL"); |