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Release 4.7 drivers/usb/gadget/udc/bdc/bdc_udc.c

/*
 * bdc_udc.c - BRCM BDC USB3.0 device controller gagdet ops
 *
 * Copyright (C) 2014 Broadcom Corporation
 *
 * Author: Ashwini Pahuja
 *
 * Based on drivers under drivers/usb/gadget/udc/
 *
 * 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.
 *
 */
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
#include <linux/pm.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <asm/unaligned.h>
#include <linux/platform_device.h>

#include "bdc.h"
#include "bdc_ep.h"
#include "bdc_cmd.h"
#include "bdc_dbg.h"


static const struct usb_gadget_ops bdc_gadget_ops;


static const char * const conn_speed_str[] =  {
	"Not connected",
	"Full Speed",
	"Low Speed",
	"High Speed",
	"Super Speed",
};

/* EP0 initial descripror */

static struct usb_endpoint_descriptor bdc_gadget_ep0_desc = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
	.bEndpointAddress = 0,
	.wMaxPacketSize	= cpu_to_le16(EP0_MAX_PKT_SIZE),
};

/* Advance the srr dqp maintained by SW */

static void srr_dqp_index_advc(struct bdc *bdc, u32 srr_num) { struct srr *srr; srr = &bdc->srr; dev_dbg_ratelimited(bdc->dev, "srr->dqp_index:%d\n", srr->dqp_index); srr->dqp_index++; /* rollback to 0 if we are past the last */ if (srr->dqp_index == NUM_SR_ENTRIES) srr->dqp_index = 0; }

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/* connect sr */
static void bdc_uspc_connected(struct bdc *bdc) { u32 speed, temp; u32 usppms; int ret; temp = bdc_readl(bdc->regs, BDC_USPC); speed = BDC_PSP(temp); dev_dbg(bdc->dev, "%s speed=%x\n", __func__, speed); switch (speed) { case BDC_SPEED_SS: bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(EP0_MAX_PKT_SIZE); bdc->gadget.ep0->maxpacket = EP0_MAX_PKT_SIZE; bdc->gadget.speed = USB_SPEED_SUPER; /* Enable U1T in SS mode */ usppms = bdc_readl(bdc->regs, BDC_USPPMS); usppms &= ~BDC_U1T(0xff); usppms |= BDC_U1T(U1_TIMEOUT); usppms |= BDC_PORT_W1S; bdc_writel(bdc->regs, BDC_USPPMS, usppms); break; case BDC_SPEED_HS: bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64); bdc->gadget.ep0->maxpacket = 64; bdc->gadget.speed = USB_SPEED_HIGH; break; case BDC_SPEED_FS: bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64); bdc->gadget.ep0->maxpacket = 64; bdc->gadget.speed = USB_SPEED_FULL; break; case BDC_SPEED_LS: bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8); bdc->gadget.ep0->maxpacket = 8; bdc->gadget.speed = USB_SPEED_LOW; break; default: dev_err(bdc->dev, "UNDEFINED SPEED\n"); return; } dev_dbg(bdc->dev, "connected at %s\n", conn_speed_str[speed]); /* Now we know the speed, configure ep0 */ bdc->bdc_ep_array[1]->desc = &bdc_gadget_ep0_desc; ret = bdc_config_ep(bdc, bdc->bdc_ep_array[1]); if (ret) dev_err(bdc->dev, "EP0 config failed\n"); bdc->bdc_ep_array[1]->usb_ep.desc = &bdc_gadget_ep0_desc; bdc->bdc_ep_array[1]->flags |= BDC_EP_ENABLED; usb_gadget_set_state(&bdc->gadget, USB_STATE_DEFAULT); }

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/* device got disconnected */
static void bdc_uspc_disconnected(struct bdc *bdc, bool reinit) { struct bdc_ep *ep; dev_dbg(bdc->dev, "%s\n", __func__); /* * Only stop ep0 from here, rest of the endpoints will be disabled * from gadget_disconnect */ ep = bdc->bdc_ep_array[1]; if (ep && (ep->flags & BDC_EP_ENABLED)) /* if enabled then stop and remove requests */ bdc_ep_disable(ep); if (bdc->gadget_driver && bdc->gadget_driver->disconnect) { spin_unlock(&bdc->lock); bdc->gadget_driver->disconnect(&bdc->gadget); spin_lock(&bdc->lock); } /* Set Unknown speed */ bdc->gadget.speed = USB_SPEED_UNKNOWN; bdc->devstatus &= DEVSTATUS_CLEAR; bdc->delayed_status = false; bdc->reinit = reinit; bdc->test_mode = false; }

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/* TNotify wkaeup timer */
static void bdc_func_wake_timer(struct work_struct *work) { struct bdc *bdc = container_of(work, struct bdc, func_wake_notify.work); unsigned long flags; dev_dbg(bdc->dev, "%s\n", __func__); spin_lock_irqsave(&bdc->lock, flags); /* * Check if host has started transferring on endpoints * FUNC_WAKE_ISSUED is cleared when transfer has started after resume */ if (bdc->devstatus & FUNC_WAKE_ISSUED) { dev_dbg(bdc->dev, "FUNC_WAKE_ISSUED FLAG IS STILL SET\n"); /* flag is still set, so again send func wake */ bdc_function_wake_fh(bdc, 0); schedule_delayed_work(&bdc->func_wake_notify, msecs_to_jiffies(BDC_TNOTIFY)); } spin_unlock_irqrestore(&bdc->lock, flags); }

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/* handler for Link state change condition */
static void handle_link_state_change(struct bdc *bdc, u32 uspc) { u32 link_state; dev_dbg(bdc->dev, "Link state change"); link_state = BDC_PST(uspc); switch (link_state) { case BDC_LINK_STATE_U3: if ((bdc->gadget.speed != USB_SPEED_UNKNOWN) && bdc->gadget_driver->suspend) { dev_dbg(bdc->dev, "Entered Suspend mode\n"); spin_unlock(&bdc->lock); bdc->devstatus |= DEVICE_SUSPENDED; bdc->gadget_driver->suspend(&bdc->gadget); spin_lock(&bdc->lock); } break; case BDC_LINK_STATE_U0: if (bdc->devstatus & REMOTE_WAKEUP_ISSUED) { bdc->devstatus &= ~REMOTE_WAKEUP_ISSUED; if (bdc->gadget.speed == USB_SPEED_SUPER) { bdc_function_wake_fh(bdc, 0); bdc->devstatus |= FUNC_WAKE_ISSUED; /* * Start a Notification timer and check if the * Host transferred anything on any of the EPs, * if not then send function wake again every * TNotification secs until host initiates * transfer to BDC, USB3 spec Table 8.13 */ schedule_delayed_work( &bdc->func_wake_notify, msecs_to_jiffies(BDC_TNOTIFY)); dev_dbg(bdc->dev, "sched func_wake_notify\n"); } } break; case BDC_LINK_STATE_RESUME: dev_dbg(bdc->dev, "Resumed from Suspend\n"); if (bdc->devstatus & DEVICE_SUSPENDED) { bdc->gadget_driver->resume(&bdc->gadget); bdc->devstatus &= ~DEVICE_SUSPENDED; } break; default: dev_dbg(bdc->dev, "link state:%d\n", link_state); } }

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/* something changes on upstream port, handle it here */
void bdc_sr_uspc(struct bdc *bdc, struct bdc_sr *sreport) { u32 clear_flags = 0; u32 uspc; bool connected = false; bool disconn = false; uspc = bdc_readl(bdc->regs, BDC_USPC); dev_dbg(bdc->dev, "%s uspc=0x%08x\n", __func__, uspc); /* Port connect changed */ if (uspc & BDC_PCC) { /* Vbus not present, and not connected to Downstream port */ if ((uspc & BDC_VBC) && !(uspc & BDC_VBS) && !(uspc & BDC_PCS)) disconn = true; else if ((uspc & BDC_PCS) && !BDC_PST(uspc)) connected = true; } /* Change in VBus and VBus is present */ if ((uspc & BDC_VBC) && (uspc & BDC_VBS)) { if (bdc->pullup) { dev_dbg(bdc->dev, "Do a softconnect\n"); /* Attached state, do a softconnect */ bdc_softconn(bdc); usb_gadget_set_state(&bdc->gadget, USB_STATE_POWERED); } clear_flags = BDC_VBC; } else if ((uspc & BDC_PRS) || (uspc & BDC_PRC) || disconn) { /* Hot reset, warm reset, 2.0 bus reset or disconn */ dev_dbg(bdc->dev, "Port reset or disconn\n"); bdc_uspc_disconnected(bdc, disconn); clear_flags = BDC_PCC|BDC_PCS|BDC_PRS|BDC_PRC; } else if ((uspc & BDC_PSC) && (uspc & BDC_PCS)) { /* Change in Link state */ handle_link_state_change(bdc, uspc); clear_flags = BDC_PSC|BDC_PCS; } /* * In SS we might not have PRC bit set before connection, but in 2.0 * the PRC bit is set before connection, so moving this condition out * of bus reset to handle both SS/2.0 speeds. */ if (connected) { /* This is the connect event for U0/L0 */ dev_dbg(bdc->dev, "Connected\n"); bdc_uspc_connected(bdc); bdc->devstatus &= ~(DEVICE_SUSPENDED); } uspc = bdc_readl(bdc->regs, BDC_USPC); uspc &= (~BDC_USPSC_RW); dev_dbg(bdc->dev, "uspc=%x\n", uspc); bdc_writel(bdc->regs, BDC_USPC, clear_flags); }

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/* Main interrupt handler for bdc */
static irqreturn_t bdc_udc_interrupt(int irq, void *_bdc) { u32 eqp_index, dqp_index, sr_type, srr_int; struct bdc_sr *sreport; struct bdc *bdc = _bdc; u32 status; int ret; spin_lock(&bdc->lock); status = bdc_readl(bdc->regs, BDC_BDCSC); if (!(status & BDC_GIP)) { spin_unlock(&bdc->lock); return IRQ_NONE; } srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0)); /* Check if the SRR IP bit it set? */ if (!(srr_int & BDC_SRR_IP)) { dev_warn(bdc->dev, "Global irq pending but SRR IP is 0\n"); spin_unlock(&bdc->lock); return IRQ_NONE; } eqp_index = BDC_SRR_EPI(srr_int); dqp_index = BDC_SRR_DPI(srr_int); dev_dbg(bdc->dev, "%s eqp_index=%d dqp_index=%d srr.dqp_index=%d\n\n", __func__, eqp_index, dqp_index, bdc->srr.dqp_index); /* check for ring empty condition */ if (eqp_index == dqp_index) { dev_dbg(bdc->dev, "SRR empty?\n"); spin_unlock(&bdc->lock); return IRQ_HANDLED; } while (bdc->srr.dqp_index != eqp_index) { sreport = &bdc->srr.sr_bds[bdc->srr.dqp_index]; /* sreport is read before using it */ rmb(); sr_type = le32_to_cpu(sreport->offset[3]) & BD_TYPE_BITMASK; dev_dbg_ratelimited(bdc->dev, "sr_type=%d\n", sr_type); switch (sr_type) { case SR_XSF: bdc->sr_handler[0](bdc, sreport); break; case SR_USPC: bdc->sr_handler[1](bdc, sreport); break; default: dev_warn(bdc->dev, "SR:%d not handled\n", sr_type); } /* Advance the srr dqp index */ srr_dqp_index_advc(bdc, 0); } /* update the hw dequeue pointer */ srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0)); srr_int &= ~BDC_SRR_DPI_MASK; srr_int &= ~(BDC_SRR_RWS|BDC_SRR_RST|BDC_SRR_ISR); srr_int |= ((bdc->srr.dqp_index) << 16); srr_int |= BDC_SRR_IP; bdc_writel(bdc->regs, BDC_SRRINT(0), srr_int); srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0)); if (bdc->reinit) { ret = bdc_reinit(bdc); if (ret) dev_err(bdc->dev, "err in bdc reinit\n"); } spin_unlock(&bdc->lock); return IRQ_HANDLED; }

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/* Gadget ops */
static int bdc_udc_start(struct usb_gadget *gadget, struct usb_gadget_driver *driver) { struct bdc *bdc = gadget_to_bdc(gadget); unsigned long flags; int ret = 0; dev_dbg(bdc->dev, "%s()\n", __func__); spin_lock_irqsave(&bdc->lock, flags); if (bdc->gadget_driver) { dev_err(bdc->dev, "%s is already bound to %s\n", bdc->gadget.name, bdc->gadget_driver->driver.name); ret = -EBUSY; goto err; } /* * Run the controller from here and when BDC is connected to * Host then driver will receive a USPC SR with VBUS present * and then driver will do a softconnect. */ ret = bdc_run(bdc); if (ret) { dev_err(bdc->dev, "%s bdc run fail\n", __func__); goto err; } bdc->gadget_driver = driver; bdc->gadget.dev.driver = &driver->driver; err: spin_unlock_irqrestore(&bdc->lock, flags); return ret; }

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static int bdc_udc_stop(struct usb_gadget *gadget) { struct bdc *bdc = gadget_to_bdc(gadget); unsigned long flags; dev_dbg(bdc->dev, "%s()\n", __func__); spin_lock_irqsave(&bdc->lock, flags); bdc_stop(bdc); bdc->gadget_driver = NULL; bdc->gadget.dev.driver = NULL; spin_unlock_irqrestore(&bdc->lock, flags); return 0; }

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static int bdc_udc_pullup(struct usb_gadget *gadget, int is_on) { struct bdc *bdc = gadget_to_bdc(gadget); unsigned long flags; u32 uspc; dev_dbg(bdc->dev, "%s() is_on:%d\n", __func__, is_on); if (!gadget) return -EINVAL; spin_lock_irqsave(&bdc->lock, flags); if (!is_on) { bdc_softdisconn(bdc); bdc->pullup = false; } else { /* * For a self powered device, we need to wait till we receive * a VBUS change and Vbus present event, then if pullup flag * is set, then only we present the Termintation. */ bdc->pullup = true; /* * Check if BDC is already connected to Host i.e Vbus=1, * if yes, then present TERM now, this is typical for bus * powered devices. */ uspc = bdc_readl(bdc->regs, BDC_USPC); if (uspc & BDC_VBS) bdc_softconn(bdc); } spin_unlock_irqrestore(&bdc->lock, flags); return 0; }

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static int bdc_udc_set_selfpowered(struct usb_gadget *gadget, int is_self) { struct bdc *bdc = gadget_to_bdc(gadget); unsigned long flags; dev_dbg(bdc->dev, "%s()\n", __func__); gadget->is_selfpowered = (is_self != 0); spin_lock_irqsave(&bdc->lock, flags); if (!is_self) bdc->devstatus |= 1 << USB_DEVICE_SELF_POWERED; else bdc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); spin_unlock_irqrestore(&bdc->lock, flags); return 0; }

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static int bdc_udc_wakeup(struct usb_gadget *gadget) { struct bdc *bdc = gadget_to_bdc(gadget); unsigned long flags; u8 link_state; u32 uspc; int ret = 0; dev_dbg(bdc->dev, "%s() bdc->devstatus=%08x\n", __func__, bdc->devstatus); if (!(bdc->devstatus & REMOTE_WAKE_ENABLE)) return -EOPNOTSUPP; spin_lock_irqsave(&bdc->lock, flags); uspc = bdc_readl(bdc->regs, BDC_USPC); link_state = BDC_PST(uspc); dev_dbg(bdc->dev, "link_state =%d portsc=%x", link_state, uspc); if (link_state != BDC_LINK_STATE_U3) { dev_warn(bdc->dev, "can't wakeup from link state %d\n", link_state); ret = -EINVAL; goto out; } if (bdc->gadget.speed == USB_SPEED_SUPER) bdc->devstatus |= REMOTE_WAKEUP_ISSUED; uspc &= ~BDC_PST_MASK; uspc &= (~BDC_USPSC_RW); uspc |= BDC_PST(BDC_LINK_STATE_U0); uspc |= BDC_SWS; bdc_writel(bdc->regs, BDC_USPC, uspc); uspc = bdc_readl(bdc->regs, BDC_USPC); link_state = BDC_PST(uspc); dev_dbg(bdc->dev, "link_state =%d portsc=%x", link_state, uspc); out: spin_unlock_irqrestore(&bdc->lock, flags); return ret; }

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static const struct usb_gadget_ops bdc_gadget_ops = { .wakeup = bdc_udc_wakeup, .set_selfpowered = bdc_udc_set_selfpowered, .pullup = bdc_udc_pullup, .udc_start = bdc_udc_start, .udc_stop = bdc_udc_stop, }; /* Init the gadget interface and register the udc */
int bdc_udc_init(struct bdc *bdc) { u32 temp; int ret; dev_dbg(bdc->dev, "%s()\n", __func__); bdc->gadget.ops = &bdc_gadget_ops; bdc->gadget.max_speed = USB_SPEED_SUPER; bdc->gadget.speed = USB_SPEED_UNKNOWN; bdc->gadget.dev.parent = bdc->dev; bdc->gadget.sg_supported = false; bdc->gadget.name = BRCM_BDC_NAME; ret = devm_request_irq(bdc->dev, bdc->irq, bdc_udc_interrupt, IRQF_SHARED , BRCM_BDC_NAME, bdc); if (ret) { dev_err(bdc->dev, "failed to request irq #%d %d\n", bdc->irq, ret); return ret; } ret = bdc_init_ep(bdc); if (ret) { dev_err(bdc->dev, "bdc init ep fail: %d\n", ret); return ret; } ret = usb_add_gadget_udc(bdc->dev, &bdc->gadget); if (ret) { dev_err(bdc->dev, "failed to register udc\n"); goto err0; } usb_gadget_set_state(&bdc->gadget, USB_STATE_NOTATTACHED); bdc->bdc_ep_array[1]->desc = &bdc_gadget_ep0_desc; /* * Allocate bd list for ep0 only, ep0 will be enabled on connect * status report when the speed is known */ ret = bdc_ep_enable(bdc->bdc_ep_array[1]); if (ret) { dev_err(bdc->dev, "fail to enable %s\n", bdc->bdc_ep_array[1]->name); goto err1; } INIT_DELAYED_WORK(&bdc->func_wake_notify, bdc_func_wake_timer); /* Enable Interrupts */ temp = bdc_readl(bdc->regs, BDC_BDCSC); temp |= BDC_GIE; bdc_writel(bdc->regs, BDC_BDCSC, temp); return 0; err1: usb_del_gadget_udc(&bdc->gadget); err0: bdc_free_ep(bdc); return ret; }

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void bdc_udc_exit(struct bdc *bdc) { unsigned long flags; dev_dbg(bdc->dev, "%s()\n", __func__); spin_lock_irqsave(&bdc->lock, flags); bdc_ep_disable(bdc->bdc_ep_array[1]); spin_unlock_irqrestore(&bdc->lock, flags); usb_del_gadget_udc(&bdc->gadget); bdc_free_ep(bdc); }

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