diff options
Diffstat (limited to 'drivers/usb/otg/ab8500-usb.c')
| -rw-r--r-- | drivers/usb/otg/ab8500-usb.c | 596 |
1 files changed, 0 insertions, 596 deletions
diff --git a/drivers/usb/otg/ab8500-usb.c b/drivers/usb/otg/ab8500-usb.c deleted file mode 100644 index 2d86f26..0000000 --- a/drivers/usb/otg/ab8500-usb.c +++ /dev/null @@ -1,596 +0,0 @@ -/* - * drivers/usb/otg/ab8500_usb.c - * - * USB transceiver driver for AB8500 chip - * - * Copyright (C) 2010 ST-Ericsson AB - * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - * - */ - -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/usb/otg.h> -#include <linux/slab.h> -#include <linux/notifier.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/mfd/abx500.h> -#include <linux/mfd/abx500/ab8500.h> - -#define AB8500_MAIN_WD_CTRL_REG 0x01 -#define AB8500_USB_LINE_STAT_REG 0x80 -#define AB8500_USB_PHY_CTRL_REG 0x8A - -#define AB8500_BIT_OTG_STAT_ID (1 << 0) -#define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0) -#define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1) -#define AB8500_BIT_WD_CTRL_ENABLE (1 << 0) -#define AB8500_BIT_WD_CTRL_KICK (1 << 1) - -#define AB8500_V1x_LINK_STAT_WAIT (HZ/10) -#define AB8500_WD_KICK_DELAY_US 100 /* usec */ -#define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */ -#define AB8500_WD_V10_DISABLE_DELAY_MS 100 /* ms */ - -/* Usb line status register */ -enum ab8500_usb_link_status { - USB_LINK_NOT_CONFIGURED = 0, - USB_LINK_STD_HOST_NC, - USB_LINK_STD_HOST_C_NS, - USB_LINK_STD_HOST_C_S, - USB_LINK_HOST_CHG_NM, - USB_LINK_HOST_CHG_HS, - USB_LINK_HOST_CHG_HS_CHIRP, - USB_LINK_DEDICATED_CHG, - USB_LINK_ACA_RID_A, - USB_LINK_ACA_RID_B, - USB_LINK_ACA_RID_C_NM, - USB_LINK_ACA_RID_C_HS, - USB_LINK_ACA_RID_C_HS_CHIRP, - USB_LINK_HM_IDGND, - USB_LINK_RESERVED, - USB_LINK_NOT_VALID_LINK -}; - -struct ab8500_usb { - struct usb_phy phy; - struct device *dev; - int irq_num_id_rise; - int irq_num_id_fall; - int irq_num_vbus_rise; - int irq_num_vbus_fall; - int irq_num_link_status; - unsigned vbus_draw; - struct delayed_work dwork; - struct work_struct phy_dis_work; - unsigned long link_status_wait; - int rev; -}; - -static inline struct ab8500_usb *phy_to_ab(struct usb_phy *x) -{ - return container_of(x, struct ab8500_usb, phy); -} - -static void ab8500_usb_wd_workaround(struct ab8500_usb *ab) -{ - abx500_set_register_interruptible(ab->dev, - AB8500_SYS_CTRL2_BLOCK, - AB8500_MAIN_WD_CTRL_REG, - AB8500_BIT_WD_CTRL_ENABLE); - - udelay(AB8500_WD_KICK_DELAY_US); - - abx500_set_register_interruptible(ab->dev, - AB8500_SYS_CTRL2_BLOCK, - AB8500_MAIN_WD_CTRL_REG, - (AB8500_BIT_WD_CTRL_ENABLE - | AB8500_BIT_WD_CTRL_KICK)); - - if (ab->rev > 0x10) /* v1.1 v2.0 */ - udelay(AB8500_WD_V11_DISABLE_DELAY_US); - else /* v1.0 */ - msleep(AB8500_WD_V10_DISABLE_DELAY_MS); - - abx500_set_register_interruptible(ab->dev, - AB8500_SYS_CTRL2_BLOCK, - AB8500_MAIN_WD_CTRL_REG, - 0); -} - -static void ab8500_usb_phy_ctrl(struct ab8500_usb *ab, bool sel_host, - bool enable) -{ - u8 ctrl_reg; - abx500_get_register_interruptible(ab->dev, - AB8500_USB, - AB8500_USB_PHY_CTRL_REG, - &ctrl_reg); - if (sel_host) { - if (enable) - ctrl_reg |= AB8500_BIT_PHY_CTRL_HOST_EN; - else - ctrl_reg &= ~AB8500_BIT_PHY_CTRL_HOST_EN; - } else { - if (enable) - ctrl_reg |= AB8500_BIT_PHY_CTRL_DEVICE_EN; - else - ctrl_reg &= ~AB8500_BIT_PHY_CTRL_DEVICE_EN; - } - - abx500_set_register_interruptible(ab->dev, - AB8500_USB, - AB8500_USB_PHY_CTRL_REG, - ctrl_reg); - - /* Needed to enable the phy.*/ - if (enable) - ab8500_usb_wd_workaround(ab); -} - -#define ab8500_usb_host_phy_en(ab) ab8500_usb_phy_ctrl(ab, true, true) -#define ab8500_usb_host_phy_dis(ab) ab8500_usb_phy_ctrl(ab, true, false) -#define ab8500_usb_peri_phy_en(ab) ab8500_usb_phy_ctrl(ab, false, true) -#define ab8500_usb_peri_phy_dis(ab) ab8500_usb_phy_ctrl(ab, false, false) - -static int ab8500_usb_link_status_update(struct ab8500_usb *ab) -{ - u8 reg; - enum ab8500_usb_link_status lsts; - void *v = NULL; - enum usb_phy_events event; - - abx500_get_register_interruptible(ab->dev, - AB8500_USB, - AB8500_USB_LINE_STAT_REG, - ®); - - lsts = (reg >> 3) & 0x0F; - - switch (lsts) { - case USB_LINK_NOT_CONFIGURED: - case USB_LINK_RESERVED: - case USB_LINK_NOT_VALID_LINK: - /* TODO: Disable regulators. */ - ab8500_usb_host_phy_dis(ab); - ab8500_usb_peri_phy_dis(ab); - ab->phy.state = OTG_STATE_B_IDLE; - ab->phy.otg->default_a = false; - ab->vbus_draw = 0; - event = USB_EVENT_NONE; - break; - - case USB_LINK_STD_HOST_NC: - case USB_LINK_STD_HOST_C_NS: - case USB_LINK_STD_HOST_C_S: - case USB_LINK_HOST_CHG_NM: - case USB_LINK_HOST_CHG_HS: - case USB_LINK_HOST_CHG_HS_CHIRP: - if (ab->phy.otg->gadget) { - /* TODO: Enable regulators. */ - ab8500_usb_peri_phy_en(ab); - v = ab->phy.otg->gadget; - } - event = USB_EVENT_VBUS; - break; - - case USB_LINK_HM_IDGND: - if (ab->phy.otg->host) { - /* TODO: Enable regulators. */ - ab8500_usb_host_phy_en(ab); - v = ab->phy.otg->host; - } - ab->phy.state = OTG_STATE_A_IDLE; - ab->phy.otg->default_a = true; - event = USB_EVENT_ID; - break; - - case USB_LINK_ACA_RID_A: - case USB_LINK_ACA_RID_B: - /* TODO */ - case USB_LINK_ACA_RID_C_NM: - case USB_LINK_ACA_RID_C_HS: - case USB_LINK_ACA_RID_C_HS_CHIRP: - case USB_LINK_DEDICATED_CHG: - /* TODO: vbus_draw */ - event = USB_EVENT_CHARGER; - break; - } - - atomic_notifier_call_chain(&ab->phy.notifier, event, v); - - return 0; -} - -static void ab8500_usb_delayed_work(struct work_struct *work) -{ - struct ab8500_usb *ab = container_of(work, struct ab8500_usb, - dwork.work); - - ab8500_usb_link_status_update(ab); -} - -static irqreturn_t ab8500_usb_v1x_common_irq(int irq, void *data) -{ - struct ab8500_usb *ab = (struct ab8500_usb *) data; - - /* Wait for link status to become stable. */ - schedule_delayed_work(&ab->dwork, ab->link_status_wait); - - return IRQ_HANDLED; -} - -static irqreturn_t ab8500_usb_v1x_vbus_fall_irq(int irq, void *data) -{ - struct ab8500_usb *ab = (struct ab8500_usb *) data; - - /* Link status will not be updated till phy is disabled. */ - ab8500_usb_peri_phy_dis(ab); - - /* Wait for link status to become stable. */ - schedule_delayed_work(&ab->dwork, ab->link_status_wait); - - return IRQ_HANDLED; -} - -static irqreturn_t ab8500_usb_v20_irq(int irq, void *data) -{ - struct ab8500_usb *ab = (struct ab8500_usb *) data; - - ab8500_usb_link_status_update(ab); - - return IRQ_HANDLED; -} - -static void ab8500_usb_phy_disable_work(struct work_struct *work) -{ - struct ab8500_usb *ab = container_of(work, struct ab8500_usb, - phy_dis_work); - - if (!ab->phy.otg->host) - ab8500_usb_host_phy_dis(ab); - - if (!ab->phy.otg->gadget) - ab8500_usb_peri_phy_dis(ab); -} - -static int ab8500_usb_set_power(struct usb_phy *phy, unsigned mA) -{ - struct ab8500_usb *ab; - - if (!phy) - return -ENODEV; - - ab = phy_to_ab(phy); - - ab->vbus_draw = mA; - - if (mA) - atomic_notifier_call_chain(&ab->phy.notifier, - USB_EVENT_ENUMERATED, ab->phy.otg->gadget); - return 0; -} - -/* TODO: Implement some way for charging or other drivers to read - * ab->vbus_draw. - */ - -static int ab8500_usb_set_suspend(struct usb_phy *x, int suspend) -{ - /* TODO */ - return 0; -} - -static int ab8500_usb_set_peripheral(struct usb_otg *otg, - struct usb_gadget *gadget) -{ - struct ab8500_usb *ab; - - if (!otg) - return -ENODEV; - - ab = phy_to_ab(otg->phy); - - /* Some drivers call this function in atomic context. - * Do not update ab8500 registers directly till this - * is fixed. - */ - - if (!gadget) { - /* TODO: Disable regulators. */ - otg->gadget = NULL; - schedule_work(&ab->phy_dis_work); - } else { - otg->gadget = gadget; - otg->phy->state = OTG_STATE_B_IDLE; - - /* Phy will not be enabled if cable is already - * plugged-in. Schedule to enable phy. - * Use same delay to avoid any race condition. - */ - schedule_delayed_work(&ab->dwork, ab->link_status_wait); - } - - return 0; -} - -static int ab8500_usb_set_host(struct usb_otg *otg, struct usb_bus *host) -{ - struct ab8500_usb *ab; - - if (!otg) - return -ENODEV; - - ab = phy_to_ab(otg->phy); - - /* Some drivers call this function in atomic context. - * Do not update ab8500 registers directly till this - * is fixed. - */ - - if (!host) { - /* TODO: Disable regulators. */ - otg->host = NULL; - schedule_work(&ab->phy_dis_work); - } else { - otg->host = host; - /* Phy will not be enabled if cable is already - * plugged-in. Schedule to enable phy. - * Use same delay to avoid any race condition. - */ - schedule_delayed_work(&ab->dwork, ab->link_status_wait); - } - - return 0; -} - -static void ab8500_usb_irq_free(struct ab8500_usb *ab) -{ - if (ab->rev < 0x20) { - free_irq(ab->irq_num_id_rise, ab); - free_irq(ab->irq_num_id_fall, ab); - free_irq(ab->irq_num_vbus_rise, ab); - free_irq(ab->irq_num_vbus_fall, ab); - } else { - free_irq(ab->irq_num_link_status, ab); - } -} - -static int ab8500_usb_v1x_res_setup(struct platform_device *pdev, - struct ab8500_usb *ab) -{ - int err; - - ab->irq_num_id_rise = platform_get_irq_byname(pdev, "ID_WAKEUP_R"); - if (ab->irq_num_id_rise < 0) { - dev_err(&pdev->dev, "ID rise irq not found\n"); - return ab->irq_num_id_rise; - } - err = request_threaded_irq(ab->irq_num_id_rise, NULL, - ab8500_usb_v1x_common_irq, - IRQF_NO_SUSPEND | IRQF_SHARED, - "usb-id-rise", ab); - if (err < 0) { - dev_err(ab->dev, "request_irq failed for ID rise irq\n"); - goto fail0; - } - - ab->irq_num_id_fall = platform_get_irq_byname(pdev, "ID_WAKEUP_F"); - if (ab->irq_num_id_fall < 0) { - dev_err(&pdev->dev, "ID fall irq not found\n"); - return ab->irq_num_id_fall; - } - err = request_threaded_irq(ab->irq_num_id_fall, NULL, - ab8500_usb_v1x_common_irq, - IRQF_NO_SUSPEND | IRQF_SHARED, - "usb-id-fall", ab); - if (err < 0) { - dev_err(ab->dev, "request_irq failed for ID fall irq\n"); - goto fail1; - } - - ab->irq_num_vbus_rise = platform_get_irq_byname(pdev, "VBUS_DET_R"); - if (ab->irq_num_vbus_rise < 0) { - dev_err(&pdev->dev, "VBUS rise irq not found\n"); - return ab->irq_num_vbus_rise; - } - err = request_threaded_irq(ab->irq_num_vbus_rise, NULL, - ab8500_usb_v1x_common_irq, - IRQF_NO_SUSPEND | IRQF_SHARED, - "usb-vbus-rise", ab); - if (err < 0) { - dev_err(ab->dev, "request_irq failed for Vbus rise irq\n"); - goto fail2; - } - - ab->irq_num_vbus_fall = platform_get_irq_byname(pdev, "VBUS_DET_F"); - if (ab->irq_num_vbus_fall < 0) { - dev_err(&pdev->dev, "VBUS fall irq not found\n"); - return ab->irq_num_vbus_fall; - } - err = request_threaded_irq(ab->irq_num_vbus_fall, NULL, - ab8500_usb_v1x_vbus_fall_irq, - IRQF_NO_SUSPEND | IRQF_SHARED, - "usb-vbus-fall", ab); - if (err < 0) { - dev_err(ab->dev, "request_irq failed for Vbus fall irq\n"); - goto fail3; - } - - return 0; -fail3: - free_irq(ab->irq_num_vbus_rise, ab); -fail2: - free_irq(ab->irq_num_id_fall, ab); -fail1: - free_irq(ab->irq_num_id_rise, ab); -fail0: - return err; -} - -static int ab8500_usb_v2_res_setup(struct platform_device *pdev, - struct ab8500_usb *ab) -{ - int err; - - ab->irq_num_link_status = platform_get_irq_byname(pdev, - "USB_LINK_STATUS"); - if (ab->irq_num_link_status < 0) { - dev_err(&pdev->dev, "Link status irq not found\n"); - return ab->irq_num_link_status; - } - - err = request_threaded_irq(ab->irq_num_link_status, NULL, - ab8500_usb_v20_irq, - IRQF_NO_SUSPEND | IRQF_SHARED, - "usb-link-status", ab); - if (err < 0) { - dev_err(ab->dev, - "request_irq failed for link status irq\n"); - return err; - } - - return 0; -} - -static int ab8500_usb_probe(struct platform_device *pdev) -{ - struct ab8500_usb *ab; - struct usb_otg *otg; - int err; - int rev; - - rev = abx500_get_chip_id(&pdev->dev); - if (rev < 0) { - dev_err(&pdev->dev, "Chip id read failed\n"); - return rev; - } else if (rev < 0x10) { - dev_err(&pdev->dev, "Unsupported AB8500 chip\n"); - return -ENODEV; - } - - ab = kzalloc(sizeof *ab, GFP_KERNEL); - if (!ab) - return -ENOMEM; - - otg = kzalloc(sizeof *otg, GFP_KERNEL); - if (!otg) { - kfree(ab); - return -ENOMEM; - } - - ab->dev = &pdev->dev; - ab->rev = rev; - ab->phy.dev = ab->dev; - ab->phy.otg = otg; - ab->phy.label = "ab8500"; - ab->phy.set_suspend = ab8500_usb_set_suspend; - ab->phy.set_power = ab8500_usb_set_power; - ab->phy.state = OTG_STATE_UNDEFINED; - - otg->phy = &ab->phy; - otg->set_host = ab8500_usb_set_host; - otg->set_peripheral = ab8500_usb_set_peripheral; - - platform_set_drvdata(pdev, ab); - - ATOMIC_INIT_NOTIFIER_HEAD(&ab->phy.notifier); - - /* v1: Wait for link status to become stable. - * all: Updates form set_host and set_peripheral as they are atomic. - */ - INIT_DELAYED_WORK(&ab->dwork, ab8500_usb_delayed_work); - - /* all: Disable phy when called from set_host and set_peripheral */ - INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work); - - if (ab->rev < 0x20) { - err = ab8500_usb_v1x_res_setup(pdev, ab); - ab->link_status_wait = AB8500_V1x_LINK_STAT_WAIT; - } else { - err = ab8500_usb_v2_res_setup(pdev, ab); - } - - if (err < 0) - goto fail0; - - err = usb_add_phy(&ab->phy, USB_PHY_TYPE_USB2); - if (err) { - dev_err(&pdev->dev, "Can't register transceiver\n"); - goto fail1; - } - - dev_info(&pdev->dev, "AB8500 usb driver initialized\n"); - - return 0; -fail1: - ab8500_usb_irq_free(ab); -fail0: - kfree(otg); - kfree(ab); - return err; -} - -static int ab8500_usb_remove(struct platform_device *pdev) -{ - struct ab8500_usb *ab = platform_get_drvdata(pdev); - - ab8500_usb_irq_free(ab); - - cancel_delayed_work_sync(&ab->dwork); - - cancel_work_sync(&ab->phy_dis_work); - - usb_remove_phy(&ab->phy); - - ab8500_usb_host_phy_dis(ab); - ab8500_usb_peri_phy_dis(ab); - - platform_set_drvdata(pdev, NULL); - - kfree(ab->phy.otg); - kfree(ab); - - return 0; -} - -static struct platform_driver ab8500_usb_driver = { - .probe = ab8500_usb_probe, - .remove = ab8500_usb_remove, - .driver = { - .name = "ab8500-usb", - .owner = THIS_MODULE, - }, -}; - -static int __init ab8500_usb_init(void) -{ - return platform_driver_register(&ab8500_usb_driver); -} -subsys_initcall(ab8500_usb_init); - -static void __exit ab8500_usb_exit(void) -{ - platform_driver_unregister(&ab8500_usb_driver); -} -module_exit(ab8500_usb_exit); - -MODULE_ALIAS("platform:ab8500_usb"); -MODULE_AUTHOR("ST-Ericsson AB"); -MODULE_DESCRIPTION("AB8500 usb transceiver driver"); -MODULE_LICENSE("GPL"); |