447 lines
12 KiB
C
447 lines
12 KiB
C
/*
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* twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
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*
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* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Author: Hema HK <hemahk@ti.com>
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/usb/musb-omap.h>
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#include <linux/usb/phy_companion.h>
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#include <linux/usb/omap_usb.h>
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#include <linux/i2c/twl.h>
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#include <linux/regulator/consumer.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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/* usb register definitions */
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#define USB_VENDOR_ID_LSB 0x00
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#define USB_VENDOR_ID_MSB 0x01
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#define USB_PRODUCT_ID_LSB 0x02
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#define USB_PRODUCT_ID_MSB 0x03
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#define USB_VBUS_CTRL_SET 0x04
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#define USB_VBUS_CTRL_CLR 0x05
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#define USB_ID_CTRL_SET 0x06
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#define USB_ID_CTRL_CLR 0x07
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#define USB_VBUS_INT_SRC 0x08
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#define USB_VBUS_INT_LATCH_SET 0x09
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#define USB_VBUS_INT_LATCH_CLR 0x0A
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#define USB_VBUS_INT_EN_LO_SET 0x0B
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#define USB_VBUS_INT_EN_LO_CLR 0x0C
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#define USB_VBUS_INT_EN_HI_SET 0x0D
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#define USB_VBUS_INT_EN_HI_CLR 0x0E
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#define USB_ID_INT_SRC 0x0F
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#define USB_ID_INT_LATCH_SET 0x10
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#define USB_ID_INT_LATCH_CLR 0x11
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#define USB_ID_INT_EN_LO_SET 0x12
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#define USB_ID_INT_EN_LO_CLR 0x13
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#define USB_ID_INT_EN_HI_SET 0x14
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#define USB_ID_INT_EN_HI_CLR 0x15
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#define USB_OTG_ADP_CTRL 0x16
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#define USB_OTG_ADP_HIGH 0x17
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#define USB_OTG_ADP_LOW 0x18
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#define USB_OTG_ADP_RISE 0x19
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#define USB_OTG_REVISION 0x1A
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/* to be moved to LDO */
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#define TWL6030_MISC2 0xE5
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#define TWL6030_CFG_LDO_PD2 0xF5
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#define TWL6030_BACKUP_REG 0xFA
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#define STS_HW_CONDITIONS 0x21
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/* In module TWL6030_MODULE_PM_MASTER */
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#define STS_HW_CONDITIONS 0x21
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#define STS_USB_ID BIT(2)
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/* In module TWL6030_MODULE_PM_RECEIVER */
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#define VUSB_CFG_TRANS 0x71
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#define VUSB_CFG_STATE 0x72
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#define VUSB_CFG_VOLTAGE 0x73
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/* in module TWL6030_MODULE_MAIN_CHARGE */
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#define CHARGERUSB_CTRL1 0x8
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#define CONTROLLER_STAT1 0x03
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#define VBUS_DET BIT(2)
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struct twl6030_usb {
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struct phy_companion comparator;
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struct device *dev;
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/* for vbus reporting with irqs disabled */
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spinlock_t lock;
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struct regulator *usb3v3;
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/* used to set vbus, in atomic path */
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struct work_struct set_vbus_work;
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int irq1;
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int irq2;
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enum omap_musb_vbus_id_status linkstat;
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u8 asleep;
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bool irq_enabled;
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bool vbus_enable;
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const char *regulator;
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};
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#define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
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/*-------------------------------------------------------------------------*/
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static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
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u8 data, u8 address)
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{
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int ret = 0;
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ret = twl_i2c_write_u8(module, data, address);
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if (ret < 0)
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dev_err(twl->dev,
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"Write[0x%x] Error %d\n", address, ret);
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return ret;
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}
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static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
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{
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u8 data, ret = 0;
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ret = twl_i2c_read_u8(module, &data, address);
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if (ret >= 0)
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ret = data;
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else
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dev_err(twl->dev,
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"readb[0x%x,0x%x] Error %d\n",
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module, address, ret);
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return ret;
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}
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static int twl6030_start_srp(struct phy_companion *comparator)
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{
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struct twl6030_usb *twl = comparator_to_twl(comparator);
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twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
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twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
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mdelay(100);
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twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
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return 0;
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}
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static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
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{
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/* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
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twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);
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/* Program CFG_LDO_PD2 register and set VUSB bit */
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twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);
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/* Program MISC2 register and set bit VUSB_IN_VBAT */
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twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);
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twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
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if (IS_ERR(twl->usb3v3))
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return -ENODEV;
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/* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
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twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
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/*
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* Program the USB_ID_CTRL_SET register to enable GND drive
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* and the ID comparators
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*/
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twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
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return 0;
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}
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static ssize_t twl6030_usb_vbus_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct twl6030_usb *twl = dev_get_drvdata(dev);
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unsigned long flags;
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int ret = -EINVAL;
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spin_lock_irqsave(&twl->lock, flags);
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switch (twl->linkstat) {
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case OMAP_MUSB_VBUS_VALID:
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ret = snprintf(buf, PAGE_SIZE, "vbus\n");
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break;
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case OMAP_MUSB_ID_GROUND:
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ret = snprintf(buf, PAGE_SIZE, "id\n");
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break;
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case OMAP_MUSB_VBUS_OFF:
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ret = snprintf(buf, PAGE_SIZE, "none\n");
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break;
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default:
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ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
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}
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spin_unlock_irqrestore(&twl->lock, flags);
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return ret;
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}
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static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
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static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
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{
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struct twl6030_usb *twl = _twl;
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enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
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u8 vbus_state, hw_state;
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hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
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vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
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CONTROLLER_STAT1);
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if (!(hw_state & STS_USB_ID)) {
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if (vbus_state & VBUS_DET) {
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regulator_enable(twl->usb3v3);
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twl->asleep = 1;
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status = OMAP_MUSB_VBUS_VALID;
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twl->linkstat = status;
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omap_musb_mailbox(status);
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} else {
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if (twl->linkstat != OMAP_MUSB_UNKNOWN) {
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status = OMAP_MUSB_VBUS_OFF;
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twl->linkstat = status;
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omap_musb_mailbox(status);
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if (twl->asleep) {
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regulator_disable(twl->usb3v3);
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twl->asleep = 0;
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}
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}
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}
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}
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sysfs_notify(&twl->dev->kobj, NULL, "vbus");
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return IRQ_HANDLED;
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}
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static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
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{
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struct twl6030_usb *twl = _twl;
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enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
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u8 hw_state;
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hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
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if (hw_state & STS_USB_ID) {
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regulator_enable(twl->usb3v3);
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twl->asleep = 1;
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twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
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twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
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status = OMAP_MUSB_ID_GROUND;
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twl->linkstat = status;
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omap_musb_mailbox(status);
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} else {
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twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
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twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
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}
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twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
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return IRQ_HANDLED;
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}
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static int twl6030_enable_irq(struct twl6030_usb *twl)
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{
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twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
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twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
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twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
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twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
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REG_INT_MSK_LINE_C);
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twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
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REG_INT_MSK_STS_C);
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twl6030_usb_irq(twl->irq2, twl);
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twl6030_usbotg_irq(twl->irq1, twl);
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return 0;
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}
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static void otg_set_vbus_work(struct work_struct *data)
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{
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struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
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set_vbus_work);
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/*
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* Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
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* register. This enables boost mode.
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*/
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if (twl->vbus_enable)
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twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
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CHARGERUSB_CTRL1);
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else
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twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
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CHARGERUSB_CTRL1);
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}
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static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
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{
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struct twl6030_usb *twl = comparator_to_twl(comparator);
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twl->vbus_enable = enabled;
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schedule_work(&twl->set_vbus_work);
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return 0;
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}
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static int twl6030_usb_probe(struct platform_device *pdev)
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{
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u32 ret;
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struct twl6030_usb *twl;
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int status, err;
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struct device_node *np = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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struct twl4030_usb_data *pdata = dev->platform_data;
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twl = devm_kzalloc(dev, sizeof *twl, GFP_KERNEL);
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if (!twl)
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return -ENOMEM;
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twl->dev = &pdev->dev;
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twl->irq1 = platform_get_irq(pdev, 0);
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twl->irq2 = platform_get_irq(pdev, 1);
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twl->linkstat = OMAP_MUSB_UNKNOWN;
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twl->comparator.set_vbus = twl6030_set_vbus;
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twl->comparator.start_srp = twl6030_start_srp;
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ret = omap_usb2_set_comparator(&twl->comparator);
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if (ret == -ENODEV) {
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dev_info(&pdev->dev, "phy not ready, deferring probe");
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return -EPROBE_DEFER;
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}
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if (np) {
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twl->regulator = "usb";
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} else if (pdata) {
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if (pdata->features & TWL6025_SUBCLASS)
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twl->regulator = "ldousb";
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else
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twl->regulator = "vusb";
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} else {
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dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
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return -EINVAL;
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}
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/* init spinlock for workqueue */
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spin_lock_init(&twl->lock);
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err = twl6030_usb_ldo_init(twl);
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if (err) {
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dev_err(&pdev->dev, "ldo init failed\n");
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return err;
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}
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platform_set_drvdata(pdev, twl);
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if (device_create_file(&pdev->dev, &dev_attr_vbus))
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dev_warn(&pdev->dev, "could not create sysfs file\n");
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INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
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twl->irq_enabled = true;
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status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"twl6030_usb", twl);
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if (status < 0) {
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dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
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twl->irq1, status);
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device_remove_file(twl->dev, &dev_attr_vbus);
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return status;
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}
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status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"twl6030_usb", twl);
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if (status < 0) {
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dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
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twl->irq2, status);
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free_irq(twl->irq1, twl);
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device_remove_file(twl->dev, &dev_attr_vbus);
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return status;
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}
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twl->asleep = 0;
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twl6030_enable_irq(twl);
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dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
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return 0;
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}
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static int __exit twl6030_usb_remove(struct platform_device *pdev)
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{
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struct twl6030_usb *twl = platform_get_drvdata(pdev);
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twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
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REG_INT_MSK_LINE_C);
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twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
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REG_INT_MSK_STS_C);
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free_irq(twl->irq1, twl);
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free_irq(twl->irq2, twl);
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regulator_put(twl->usb3v3);
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device_remove_file(twl->dev, &dev_attr_vbus);
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cancel_work_sync(&twl->set_vbus_work);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id twl6030_usb_id_table[] = {
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{ .compatible = "ti,twl6030-usb" },
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{}
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};
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MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
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#endif
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static struct platform_driver twl6030_usb_driver = {
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.probe = twl6030_usb_probe,
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.remove = __exit_p(twl6030_usb_remove),
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.driver = {
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.name = "twl6030_usb",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(twl6030_usb_id_table),
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},
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};
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static int __init twl6030_usb_init(void)
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{
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return platform_driver_register(&twl6030_usb_driver);
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}
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subsys_initcall(twl6030_usb_init);
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static void __exit twl6030_usb_exit(void)
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{
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platform_driver_unregister(&twl6030_usb_driver);
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}
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module_exit(twl6030_usb_exit);
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MODULE_ALIAS("platform:twl6030_usb");
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MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
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MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
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MODULE_LICENSE("GPL");
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