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path: root/drivers/usb/otg/ab8500-usb.c
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Diffstat (limited to 'drivers/usb/otg/ab8500-usb.c')
-rw-r--r--drivers/usb/otg/ab8500-usb.c596
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,
- &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");