From patchwork Thu Dec 27 06:59:59 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Chen X-Patchwork-Id: 1912301 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id E65453FF0F for ; Thu, 27 Dec 2012 07:04:47 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1To7Su-0001UW-FV; Thu, 27 Dec 2012 07:01:16 +0000 Received: from va3ehsobe005.messaging.microsoft.com ([216.32.180.31] helo=va3outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1To7SN-0001Pg-Oi for linux-arm-kernel@lists.infradead.org; Thu, 27 Dec 2012 07:00:47 +0000 Received: from mail249-va3-R.bigfish.com (10.7.14.250) by VA3EHSOBE008.bigfish.com (10.7.40.28) with Microsoft SMTP Server id 14.1.225.23; Thu, 27 Dec 2012 07:00:37 +0000 Received: from mail249-va3 (localhost [127.0.0.1]) by mail249-va3-R.bigfish.com (Postfix) with ESMTP id E4AC0C801B7; Thu, 27 Dec 2012 07:00:36 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 3 X-BigFish: VS3(zzc8kzz1de0h1202h1e76h1d1ah1d2ahzz8275bhz2dh2a8h668h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h1354h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1155h) Received: from mail249-va3 (localhost.localdomain [127.0.0.1]) by mail249-va3 (MessageSwitch) id 1356591633861709_1786; Thu, 27 Dec 2012 07:00:33 +0000 (UTC) Received: from VA3EHSMHS040.bigfish.com (unknown [10.7.14.251]) by mail249-va3.bigfish.com (Postfix) with ESMTP id C4003C0004A; Thu, 27 Dec 2012 07:00:33 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by VA3EHSMHS040.bigfish.com (10.7.99.50) with Microsoft SMTP Server (TLS) id 14.1.225.23; Thu, 27 Dec 2012 07:00:33 +0000 Received: from tx30smr01.am.freescale.net (10.81.153.31) by 039-SN1MMR1-002.039d.mgd.msft.net (10.84.1.15) with Microsoft SMTP Server (TLS) id 14.2.318.3; Thu, 27 Dec 2012 07:00:32 +0000 Received: from localhost.localdomain (nchen-desktop.ap.freescale.net [10.192.242.40]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id qBR704hW008443; Thu, 27 Dec 2012 00:00:28 -0700 From: Peter Chen To: , Subject: [PATCH v4 3/7] usb: chipidea: add otg id switch and vbus connect/disconnect detect Date: Thu, 27 Dec 2012 14:59:59 +0800 Message-ID: <1356591603-23323-4-git-send-email-peter.chen@freescale.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1356591603-23323-1-git-send-email-peter.chen@freescale.com> References: <1356591603-23323-1-git-send-email-peter.chen@freescale.com> MIME-Version: 1.0 X-OriginatorOrg: freescale.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20121227_020044_038742_29E61C28 X-CRM114-Status: GOOD ( 28.74 ) X-Spam-Score: 0.4 (/) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (0.4 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [216.32.180.31 listed in list.dnswl.org] 3.0 KHOP_BIG_TO_CC Sent to 10+ recipients instaed of Bcc or a list -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: marex@denx.de, m.grzeschik@pengutronix.de, matt@genesi-usa.com, linux-usb@vger.kernel.org, balbi@ti.com, mkl@pengutronix.de, kernel@pengutronix.de, gregkh@linuxfoundation.org, shawn.guo@linaro.org, festevam@gmail.com, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The main design flow is the same with msm otg driver, that is the id and vbus interrupt are handled at core driver, others are handled by individual drivers. - At former design, when switch usb role from device->host, it will call udc_stop, it will remove the gadget driver, so when switch role from host->device, it can't add gadget driver any more. At new design, when role switch occurs, the gadget just calls usb_gadget_vbus_disconnect/usb_gadget_vbus_connect as well as reset controller, it will not free any device/gadget structure - Add vbus connect and disconnect to core interrupt handler, it can notify udc driver by calling usb_gadget_vbus_disconnect /usb_gadget_vbus_connect. Signed-off-by: Peter Chen --- Changes for v4: - Change the otg event flag from the bitmask to bool flag - Add some otg helper functions - Move some hardware init to hw_device_init - Move the otg init to one block Changes for v3: - Add prefix CI_ for ID and B_SESS_VALID - Use new API hw_wait_reg which is alexander sugguested to wait vbus voltage stable drivers/usb/chipidea/bits.h | 10 +++ drivers/usb/chipidea/ci.h | 8 ++- drivers/usb/chipidea/core.c | 177 ++++++++++++++++++++++++++++++++++++++---- drivers/usb/chipidea/otg.c | 28 +++++--- drivers/usb/chipidea/otg.h | 3 + drivers/usb/chipidea/udc.c | 2 + 6 files changed, 200 insertions(+), 28 deletions(-) diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h index 050de85..ba9c6ef 100644 --- a/drivers/usb/chipidea/bits.h +++ b/drivers/usb/chipidea/bits.h @@ -65,11 +65,21 @@ #define OTGSC_ASVIS BIT(18) #define OTGSC_BSVIS BIT(19) #define OTGSC_BSEIS BIT(20) +#define OTGSC_1MSIS BIT(21) +#define OTGSC_DPIS BIT(22) #define OTGSC_IDIE BIT(24) #define OTGSC_AVVIE BIT(25) #define OTGSC_ASVIE BIT(26) #define OTGSC_BSVIE BIT(27) #define OTGSC_BSEIE BIT(28) +#define OTGSC_1MSIE BIT(29) +#define OTGSC_DPIE BIT(30) +#define OTGSC_INT_EN_BITS (OTGSC_IDIE | OTGSC_AVVIE | OTGSC_ASVIE \ + | OTGSC_BSVIE | OTGSC_BSEIE | OTGSC_1MSIE \ + | OTGSC_DPIE) +#define OTGSC_INT_STATUS_BITS (OTGSC_IDIS | OTGSC_AVVIS | OTGSC_ASVIS \ + | OTGSC_BSVIS | OTGSC_BSEIS | OTGSC_1MSIS \ + | OTGSC_DPIS) /* USBMODE */ #define USBMODE_CM (0x03UL << 0) diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h index 8702871..325d790 100644 --- a/drivers/usb/chipidea/ci.h +++ b/drivers/usb/chipidea/ci.h @@ -130,6 +130,7 @@ struct hw_bank { * @transceiver: pointer to USB PHY, if any * @hcd: pointer to usb_hcd for ehci host driver * @otg: for otg support + * @events: events for otg, and handled at ci_role_work */ struct ci13xxx { struct device *dev; @@ -140,6 +141,7 @@ struct ci13xxx { enum ci_role role; bool is_otg; struct work_struct work; + struct delayed_work dwork; struct workqueue_struct *wq; struct dma_pool *qh_pool; @@ -165,7 +167,9 @@ struct ci13xxx { bool global_phy; struct usb_phy *transceiver; struct usb_hcd *hcd; - struct usb_otg otg; + struct usb_otg otg; + bool id_event; + bool b_sess_valid_event; }; static inline struct ci_role_driver *ci_role(struct ci13xxx *ci) @@ -314,4 +318,6 @@ int hw_port_test_set(struct ci13xxx *ci, u8 mode); u8 hw_port_test_get(struct ci13xxx *ci); +void ci_handle_vbus_change(struct ci13xxx *ci); + #endif /* __DRIVERS_USB_CHIPIDEA_CI_H */ diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c index aebf695..f8f8484 100644 --- a/drivers/usb/chipidea/core.c +++ b/drivers/usb/chipidea/core.c @@ -73,6 +73,7 @@ #include "bits.h" #include "host.h" #include "debug.h" +#include "otg.h" /* Controller register map */ static uintptr_t ci_regs_nolpm[] = { @@ -199,6 +200,14 @@ static int hw_device_init(struct ci13xxx *ci, void __iomem *base) if (ci->hw_ep_max > ENDPT_MAX) return -ENODEV; + /* Disable all interrupts bits */ + hw_write(ci, OP_USBINTR, 0xffffffff, 0); + ci_disable_otg_interrupt(ci, OTGSC_INT_EN_BITS); + + /* Clear all interrupts status bits*/ + hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff); + ci_clear_otg_interrupt(ci, OTGSC_INT_STATUS_BITS); + dev_dbg(ci->dev, "ChipIdea HDRC found, lpm: %d; cap: %p op: %p\n", ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op); @@ -265,24 +274,124 @@ static enum ci_role ci_otg_role(struct ci13xxx *ci) } /** - * ci_role_work - perform role changing based on ID pin - * @work: work struct + * hw_wait_reg: wait the register value + * + * Sometimes, it needs to wait register value before going on. + * Eg, when switch to device mode, the vbus value should be lower + * than OTGSC_BSV before connects to host. + * + * @ci: the controller + * @reg: register index + * @mask: mast bit + * @value: the bit value to wait + * @timeout: timeout to indicate an error + * + * This function returns an error code if timeout */ -static void ci_role_work(struct work_struct *work) +static int hw_wait_reg(struct ci13xxx *ci, enum ci13xxx_regs reg, u32 mask, + u32 value, unsigned long timeout) +{ + unsigned long elapse = jiffies + timeout; + + while (hw_read(ci, reg, mask) != value) { + if (time_after(jiffies, elapse)) { + dev_err(ci->dev, "timeout waiting for %08x in %d\n", + mask, reg); + return -ETIMEDOUT; + } + msleep(20); + } + + return 0; +} + +#define CI_VBUS_STABLE_TIMEOUT 500 +static void ci_handle_id_switch(struct ci13xxx *ci) { - struct ci13xxx *ci = container_of(work, struct ci13xxx, work); enum ci_role role = ci_otg_role(ci); if (role != ci->role) { dev_dbg(ci->dev, "switching from %s to %s\n", ci_role(ci)->name, ci->roles[role]->name); - ci_role_stop(ci); - ci_role_start(ci, role); - enable_irq(ci->irq); + /* 1. Finish the current role */ + if (ci->role == CI_ROLE_GADGET) { + usb_gadget_vbus_disconnect(&ci->gadget); + /* host doesn't care B_SESSION_VALID event */ + ci_clear_otg_interrupt(ci, OTGSC_BSVIS); + ci_disable_otg_interrupt(ci, OTGSC_BSVIE); + ci->role = CI_ROLE_END; + /* reset controller */ + hw_device_reset(ci, USBMODE_CM_IDLE); + } else if (ci->role == CI_ROLE_HOST) { + ci_role_stop(ci); + /* reset controller */ + hw_device_reset(ci, USBMODE_CM_IDLE); + } + + /* 2. Turn on/off vbus according to coming role */ + if (ci_otg_role(ci) == CI_ROLE_GADGET) { + otg_set_vbus(&ci->otg, false); + /* wait vbus lower than OTGSC_BSV */ + hw_wait_reg(ci, OP_OTGSC, OTGSC_BSV, 0, + CI_VBUS_STABLE_TIMEOUT); + } else if (ci_otg_role(ci) == CI_ROLE_HOST) { + otg_set_vbus(&ci->otg, true); + /* wait vbus higher than OTGSC_AVV */ + hw_wait_reg(ci, OP_OTGSC, OTGSC_AVV, OTGSC_AVV, + CI_VBUS_STABLE_TIMEOUT); + } + + /* 3. Begin the new role */ + if (ci_otg_role(ci) == CI_ROLE_GADGET) { + ci->role = role; + ci_clear_otg_interrupt(ci, OTGSC_BSVIS); + ci_enable_otg_interrupt(ci, OTGSC_BSVIE); + } else if (ci_otg_role(ci) == CI_ROLE_HOST) { + ci_role_start(ci, role); + } } } +void ci_handle_vbus_change(struct ci13xxx *ci) +{ + u32 otgsc = hw_read(ci, OP_OTGSC, ~0); + + if (otgsc & OTGSC_BSV) + usb_gadget_vbus_connect(&ci->gadget); + else + usb_gadget_vbus_disconnect(&ci->gadget); +} + +/** + * ci_otg_work - perform otg (vbus/id) event handle + * @work: work struct + */ +static void ci_otg_work(struct work_struct *work) +{ + struct ci13xxx *ci = container_of(work, struct ci13xxx, work); + + if (ci->id_event) { + ci->id_event = false; + ci_handle_id_switch(ci); + } else if (ci->b_sess_valid_event) { + ci->b_sess_valid_event = false; + ci_handle_vbus_change(ci); + } else + dev_err(ci->dev, "unexpected event occurs at %s\n", __func__); + + enable_irq(ci->irq); +} + +static void ci_delayed_work(struct work_struct *work) +{ + struct delayed_work *dwork = to_delayed_work(work); + struct ci13xxx *ci = container_of(dwork, struct ci13xxx, dwork); + + otg_set_vbus(&ci->otg, true); + +} + static ssize_t show_role(struct device *dev, struct device_attribute *attr, char *buf) { @@ -321,19 +430,36 @@ static irqreturn_t ci_irq(int irq, void *data) irqreturn_t ret = IRQ_NONE; u32 otgsc = 0; - if (ci->is_otg) - otgsc = hw_read(ci, OP_OTGSC, ~0); + otgsc = hw_read(ci, OP_OTGSC, ~0); - if (ci->role != CI_ROLE_END) - ret = ci_role(ci)->irq(ci); + /* + * Handle id change interrupt, it indicates device/host function + * switch. + */ + if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) { + ci->id_event = true; + ci_clear_otg_interrupt(ci, OTGSC_IDIS); + disable_irq_nosync(ci->irq); + queue_work(ci->wq, &ci->work); + return IRQ_HANDLED; + } - if (ci->is_otg && (otgsc & OTGSC_IDIS)) { - hw_write(ci, OP_OTGSC, OTGSC_IDIS, OTGSC_IDIS); + /* + * Handle vbus change interrupt, it indicates device connection + * and disconnection events. + */ + if ((otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) { + ci->b_sess_valid_event = true; + ci_clear_otg_interrupt(ci, OTGSC_BSVIS); disable_irq_nosync(ci->irq); queue_work(ci->wq, &ci->work); - ret = IRQ_HANDLED; + return IRQ_HANDLED; } + /* Handle device/host interrupt */ + if (ci->role != CI_ROLE_END) + ret = ci_role(ci)->irq(ci); + return ret; } @@ -398,6 +524,7 @@ static int ci_hdrc_probe(struct platform_device *pdev) struct resource *res; void __iomem *base; int ret; + u32 otgsc; if (!dev->platform_data) { dev_err(dev, "platform data missing\n"); @@ -443,7 +570,8 @@ static int ci_hdrc_probe(struct platform_device *pdev) return -ENODEV; } - INIT_WORK(&ci->work, ci_role_work); + INIT_WORK(&ci->work, ci_otg_work); + INIT_DELAYED_WORK(&ci->dwork, ci_delayed_work); ci->wq = create_singlethread_workqueue("ci_otg"); if (!ci->wq) { dev_err(dev, "can't create workqueue\n"); @@ -466,7 +594,10 @@ static int ci_hdrc_probe(struct platform_device *pdev) } if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) { + dev_dbg(dev, "support otg\n"); ci->is_otg = true; + /* if otg is supported, create struct usb_otg */ + ci_hdrc_otg_init(ci); /* ID pin needs 1ms debouce time, we delay 2ms for safe */ mdelay(2); ci->role = ci_otg_role(ci); @@ -483,6 +614,17 @@ static int ci_hdrc_probe(struct platform_device *pdev) goto rm_wq; } + otgsc = hw_read(ci, OP_OTGSC, ~0); + /* + * if it is device mode: + * - Enable vbus detect + * - If it has already connected to host, notify udc + */ + if (ci->role == CI_ROLE_GADGET) { + ci_enable_otg_interrupt(ci, OTGSC_BSVIE); + ci_handle_vbus_change(ci); + } + platform_set_drvdata(pdev, ci); ret = request_irq(ci->irq, ci_irq, IRQF_SHARED, ci->platdata->name, ci); @@ -493,8 +635,9 @@ static int ci_hdrc_probe(struct platform_device *pdev) if (ret) goto rm_attr; - if (ci->is_otg) - hw_write(ci, OP_OTGSC, OTGSC_IDIE, OTGSC_IDIE); + /* Handle the situation that usb device at the MicroB to A cable */ + if (ci->is_otg && !(otgsc & OTGSC_ID)) + queue_delayed_work(ci->wq, &ci->dwork, msecs_to_jiffies(500)); return ret; diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c index 7dea3b3..2986d91 100644 --- a/drivers/usb/chipidea/otg.c +++ b/drivers/usb/chipidea/otg.c @@ -10,21 +10,28 @@ * published by the Free Software Foundation. */ -#include -#include -#include -#include -#include -#include -#include #include +#include #include #include "ci.h" -#include "udc.h" #include "bits.h" -#include "host.h" -#include "debug.h" + +void ci_clear_otg_interrupt(struct ci13xxx *ci, u32 bits) +{ + /* Only clear request bits */ + hw_write(ci, OP_OTGSC, OTGSC_INT_STATUS_BITS, bits); +} + +void ci_enable_otg_interrupt(struct ci13xxx *ci, u32 bits) +{ + hw_write(ci, OP_OTGSC, bits, bits); +} + +void ci_disable_otg_interrupt(struct ci13xxx *ci, u32 bits) +{ + hw_write(ci, OP_OTGSC, bits, 0); +} static int ci_otg_set_peripheral(struct usb_otg *otg, struct usb_gadget *periph) @@ -55,6 +62,7 @@ int ci_hdrc_otg_init(struct ci13xxx *ci) ci->otg.set_host = ci_otg_set_host; if (!IS_ERR_OR_NULL(ci->transceiver)) ci->transceiver->otg = &ci->otg; + ci_enable_otg_interrupt(ci, OTGSC_IDIE); return 0; } diff --git a/drivers/usb/chipidea/otg.h b/drivers/usb/chipidea/otg.h index b4c6b3e..fa30428 100644 --- a/drivers/usb/chipidea/otg.h +++ b/drivers/usb/chipidea/otg.h @@ -2,5 +2,8 @@ #define __DRIVERS_USB_CHIPIDEA_OTG_H int ci_hdrc_otg_init(struct ci13xxx *ci); +void ci_clear_otg_interrupt(struct ci13xxx *ci, u32 bits); +void ci_enable_otg_interrupt(struct ci13xxx *ci, u32 bits); +void ci_disable_otg_interrupt(struct ci13xxx *ci, u32 bits); #endif /* __DRIVERS_USB_CHIPIDEA_OTG_H */ diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c index d214448..b52cb10 100644 --- a/drivers/usb/chipidea/udc.c +++ b/drivers/usb/chipidea/udc.c @@ -1371,6 +1371,7 @@ static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active) pm_runtime_get_sync(&_gadget->dev); hw_device_reset(ci, USBMODE_CM_DC); hw_device_state(ci, ci->ep0out->qh.dma); + dev_dbg(ci->dev, "Connected to host\n"); } else { hw_device_state(ci, 0); if (ci->platdata->notify_event) @@ -1378,6 +1379,7 @@ static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active) CI13XXX_CONTROLLER_STOPPED_EVENT); _gadget_stop_activity(&ci->gadget); pm_runtime_put_sync(&_gadget->dev); + dev_dbg(ci->dev, "disconnected from host\n"); } }