590 lines
15 KiB
C
590 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* bdc_udc.c - BRCM BDC USB3.0 device controller gagdet ops
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*
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* Copyright (C) 2014 Broadcom Corporation
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*
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* Author: Ashwini Pahuja
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*
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* Based on drivers under drivers/usb/gadget/udc/
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/moduleparam.h>
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#include <linux/device.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/otg.h>
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#include <linux/pm.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <asm/unaligned.h>
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#include <linux/platform_device.h>
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#include "bdc.h"
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#include "bdc_ep.h"
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#include "bdc_cmd.h"
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#include "bdc_dbg.h"
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static const struct usb_gadget_ops bdc_gadget_ops;
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static const char * const conn_speed_str[] = {
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"Not connected",
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"Full Speed",
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"Low Speed",
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"High Speed",
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"Super Speed",
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};
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/* EP0 initial descripror */
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static struct usb_endpoint_descriptor bdc_gadget_ep0_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
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.bEndpointAddress = 0,
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.wMaxPacketSize = cpu_to_le16(EP0_MAX_PKT_SIZE),
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};
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/* Advance the srr dqp maintained by SW */
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static void srr_dqp_index_advc(struct bdc *bdc, u32 srr_num)
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{
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struct srr *srr;
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srr = &bdc->srr;
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dev_dbg_ratelimited(bdc->dev, "srr->dqp_index:%d\n", srr->dqp_index);
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srr->dqp_index++;
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/* rollback to 0 if we are past the last */
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if (srr->dqp_index == NUM_SR_ENTRIES)
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srr->dqp_index = 0;
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}
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/* connect sr */
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static void bdc_uspc_connected(struct bdc *bdc)
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{
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u32 speed, temp;
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u32 usppms;
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int ret;
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temp = bdc_readl(bdc->regs, BDC_USPC);
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speed = BDC_PSP(temp);
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dev_dbg(bdc->dev, "%s speed=%x\n", __func__, speed);
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switch (speed) {
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case BDC_SPEED_SS:
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bdc_gadget_ep0_desc.wMaxPacketSize =
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cpu_to_le16(EP0_MAX_PKT_SIZE);
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bdc->gadget.ep0->maxpacket = EP0_MAX_PKT_SIZE;
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bdc->gadget.speed = USB_SPEED_SUPER;
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/* Enable U1T in SS mode */
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usppms = bdc_readl(bdc->regs, BDC_USPPMS);
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usppms &= ~BDC_U1T(0xff);
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usppms |= BDC_U1T(U1_TIMEOUT);
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usppms |= BDC_PORT_W1S;
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bdc_writel(bdc->regs, BDC_USPPMS, usppms);
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break;
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case BDC_SPEED_HS:
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bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
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bdc->gadget.ep0->maxpacket = 64;
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bdc->gadget.speed = USB_SPEED_HIGH;
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break;
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case BDC_SPEED_FS:
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bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
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bdc->gadget.ep0->maxpacket = 64;
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bdc->gadget.speed = USB_SPEED_FULL;
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break;
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case BDC_SPEED_LS:
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bdc_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
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bdc->gadget.ep0->maxpacket = 8;
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bdc->gadget.speed = USB_SPEED_LOW;
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break;
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default:
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dev_err(bdc->dev, "UNDEFINED SPEED\n");
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return;
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}
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dev_dbg(bdc->dev, "connected at %s\n", conn_speed_str[speed]);
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/* Now we know the speed, configure ep0 */
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bdc->bdc_ep_array[1]->desc = &bdc_gadget_ep0_desc;
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ret = bdc_config_ep(bdc, bdc->bdc_ep_array[1]);
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if (ret)
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dev_err(bdc->dev, "EP0 config failed\n");
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bdc->bdc_ep_array[1]->usb_ep.desc = &bdc_gadget_ep0_desc;
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bdc->bdc_ep_array[1]->flags |= BDC_EP_ENABLED;
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usb_gadget_set_state(&bdc->gadget, USB_STATE_DEFAULT);
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}
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/* device got disconnected */
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static void bdc_uspc_disconnected(struct bdc *bdc, bool reinit)
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{
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struct bdc_ep *ep;
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dev_dbg(bdc->dev, "%s\n", __func__);
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/*
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* Only stop ep0 from here, rest of the endpoints will be disabled
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* from gadget_disconnect
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*/
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ep = bdc->bdc_ep_array[1];
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if (ep && (ep->flags & BDC_EP_ENABLED))
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/* if enabled then stop and remove requests */
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bdc_ep_disable(ep);
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if (bdc->gadget_driver && bdc->gadget_driver->disconnect) {
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spin_unlock(&bdc->lock);
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bdc->gadget_driver->disconnect(&bdc->gadget);
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spin_lock(&bdc->lock);
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}
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/* Set Unknown speed */
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bdc->gadget.speed = USB_SPEED_UNKNOWN;
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bdc->devstatus &= DEVSTATUS_CLEAR;
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bdc->delayed_status = false;
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bdc->reinit = reinit;
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bdc->test_mode = false;
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}
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/* TNotify wkaeup timer */
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static void bdc_func_wake_timer(struct work_struct *work)
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{
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struct bdc *bdc = container_of(work, struct bdc, func_wake_notify.work);
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unsigned long flags;
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dev_dbg(bdc->dev, "%s\n", __func__);
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spin_lock_irqsave(&bdc->lock, flags);
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/*
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* Check if host has started transferring on endpoints
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* FUNC_WAKE_ISSUED is cleared when transfer has started after resume
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*/
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if (bdc->devstatus & FUNC_WAKE_ISSUED) {
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dev_dbg(bdc->dev, "FUNC_WAKE_ISSUED FLAG IS STILL SET\n");
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/* flag is still set, so again send func wake */
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bdc_function_wake_fh(bdc, 0);
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schedule_delayed_work(&bdc->func_wake_notify,
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msecs_to_jiffies(BDC_TNOTIFY));
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}
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spin_unlock_irqrestore(&bdc->lock, flags);
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}
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/* handler for Link state change condition */
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static void handle_link_state_change(struct bdc *bdc, u32 uspc)
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{
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u32 link_state;
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dev_dbg(bdc->dev, "Link state change");
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link_state = BDC_PST(uspc);
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switch (link_state) {
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case BDC_LINK_STATE_U3:
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if ((bdc->gadget.speed != USB_SPEED_UNKNOWN) &&
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bdc->gadget_driver->suspend) {
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dev_dbg(bdc->dev, "Entered Suspend mode\n");
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spin_unlock(&bdc->lock);
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bdc->devstatus |= DEVICE_SUSPENDED;
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bdc->gadget_driver->suspend(&bdc->gadget);
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spin_lock(&bdc->lock);
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}
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break;
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case BDC_LINK_STATE_U0:
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if (bdc->devstatus & REMOTE_WAKEUP_ISSUED) {
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bdc->devstatus &= ~REMOTE_WAKEUP_ISSUED;
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if (bdc->gadget.speed == USB_SPEED_SUPER) {
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bdc_function_wake_fh(bdc, 0);
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bdc->devstatus |= FUNC_WAKE_ISSUED;
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/*
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* Start a Notification timer and check if the
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* Host transferred anything on any of the EPs,
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* if not then send function wake again every
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* TNotification secs until host initiates
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* transfer to BDC, USB3 spec Table 8.13
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*/
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schedule_delayed_work(
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&bdc->func_wake_notify,
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msecs_to_jiffies(BDC_TNOTIFY));
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dev_dbg(bdc->dev, "sched func_wake_notify\n");
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}
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}
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break;
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case BDC_LINK_STATE_RESUME:
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dev_dbg(bdc->dev, "Resumed from Suspend\n");
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if (bdc->devstatus & DEVICE_SUSPENDED) {
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bdc->gadget_driver->resume(&bdc->gadget);
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bdc->devstatus &= ~DEVICE_SUSPENDED;
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}
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break;
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default:
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dev_dbg(bdc->dev, "link state:%d\n", link_state);
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}
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}
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/* something changes on upstream port, handle it here */
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void bdc_sr_uspc(struct bdc *bdc, struct bdc_sr *sreport)
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{
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u32 clear_flags = 0;
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u32 uspc;
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bool connected = false;
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bool disconn = false;
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uspc = bdc_readl(bdc->regs, BDC_USPC);
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dev_dbg(bdc->dev, "%s uspc=0x%08x\n", __func__, uspc);
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/* Port connect changed */
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if (uspc & BDC_PCC) {
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/* Vbus not present, and not connected to Downstream port */
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if ((uspc & BDC_VBC) && !(uspc & BDC_VBS) && !(uspc & BDC_PCS))
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disconn = true;
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else if ((uspc & BDC_PCS) && !BDC_PST(uspc))
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connected = true;
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clear_flags |= BDC_PCC;
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}
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/* Change in VBus and VBus is present */
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if ((uspc & BDC_VBC) && (uspc & BDC_VBS)) {
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if (bdc->pullup) {
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dev_dbg(bdc->dev, "Do a softconnect\n");
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/* Attached state, do a softconnect */
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bdc_softconn(bdc);
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usb_gadget_set_state(&bdc->gadget, USB_STATE_POWERED);
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}
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clear_flags |= BDC_VBC;
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} else if ((uspc & BDC_PRS) || (uspc & BDC_PRC) || disconn) {
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/* Hot reset, warm reset, 2.0 bus reset or disconn */
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dev_dbg(bdc->dev, "Port reset or disconn\n");
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bdc_uspc_disconnected(bdc, disconn);
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clear_flags |= BDC_PRC;
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} else if ((uspc & BDC_PSC) && (uspc & BDC_PCS)) {
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/* Change in Link state */
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handle_link_state_change(bdc, uspc);
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clear_flags |= BDC_PSC;
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}
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/*
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* In SS we might not have PRC bit set before connection, but in 2.0
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* the PRC bit is set before connection, so moving this condition out
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* of bus reset to handle both SS/2.0 speeds.
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*/
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if (connected) {
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/* This is the connect event for U0/L0 */
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dev_dbg(bdc->dev, "Connected\n");
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bdc_uspc_connected(bdc);
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bdc->devstatus &= ~(DEVICE_SUSPENDED);
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}
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uspc = bdc_readl(bdc->regs, BDC_USPC);
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uspc &= (~BDC_USPSC_RW);
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dev_dbg(bdc->dev, "uspc=%x\n", uspc);
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bdc_writel(bdc->regs, BDC_USPC, clear_flags);
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}
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/* Main interrupt handler for bdc */
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static irqreturn_t bdc_udc_interrupt(int irq, void *_bdc)
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{
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u32 eqp_index, dqp_index, sr_type, srr_int;
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struct bdc_sr *sreport;
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struct bdc *bdc = _bdc;
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u32 status;
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int ret;
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spin_lock(&bdc->lock);
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status = bdc_readl(bdc->regs, BDC_BDCSC);
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if (!(status & BDC_GIP)) {
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spin_unlock(&bdc->lock);
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return IRQ_NONE;
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}
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srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0));
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/* Check if the SRR IP bit it set? */
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if (!(srr_int & BDC_SRR_IP)) {
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dev_warn(bdc->dev, "Global irq pending but SRR IP is 0\n");
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spin_unlock(&bdc->lock);
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return IRQ_NONE;
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}
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eqp_index = BDC_SRR_EPI(srr_int);
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dqp_index = BDC_SRR_DPI(srr_int);
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dev_dbg(bdc->dev,
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"%s eqp_index=%d dqp_index=%d srr.dqp_index=%d\n\n",
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__func__, eqp_index, dqp_index, bdc->srr.dqp_index);
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/* check for ring empty condition */
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if (eqp_index == dqp_index) {
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dev_dbg(bdc->dev, "SRR empty?\n");
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spin_unlock(&bdc->lock);
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return IRQ_HANDLED;
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}
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while (bdc->srr.dqp_index != eqp_index) {
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sreport = &bdc->srr.sr_bds[bdc->srr.dqp_index];
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/* sreport is read before using it */
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rmb();
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sr_type = le32_to_cpu(sreport->offset[3]) & BD_TYPE_BITMASK;
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dev_dbg_ratelimited(bdc->dev, "sr_type=%d\n", sr_type);
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switch (sr_type) {
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case SR_XSF:
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bdc->sr_handler[0](bdc, sreport);
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break;
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case SR_USPC:
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bdc->sr_handler[1](bdc, sreport);
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break;
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default:
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dev_warn(bdc->dev, "SR:%d not handled\n", sr_type);
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}
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/* Advance the srr dqp index */
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srr_dqp_index_advc(bdc, 0);
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}
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/* update the hw dequeue pointer */
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srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0));
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srr_int &= ~BDC_SRR_DPI_MASK;
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srr_int &= ~(BDC_SRR_RWS|BDC_SRR_RST|BDC_SRR_ISR);
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srr_int |= ((bdc->srr.dqp_index) << 16);
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srr_int |= BDC_SRR_IP;
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bdc_writel(bdc->regs, BDC_SRRINT(0), srr_int);
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srr_int = bdc_readl(bdc->regs, BDC_SRRINT(0));
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if (bdc->reinit) {
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ret = bdc_reinit(bdc);
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if (ret)
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dev_err(bdc->dev, "err in bdc reinit\n");
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}
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spin_unlock(&bdc->lock);
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return IRQ_HANDLED;
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}
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/* Gadget ops */
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static int bdc_udc_start(struct usb_gadget *gadget,
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struct usb_gadget_driver *driver)
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{
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struct bdc *bdc = gadget_to_bdc(gadget);
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unsigned long flags;
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int ret = 0;
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dev_dbg(bdc->dev, "%s()\n", __func__);
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spin_lock_irqsave(&bdc->lock, flags);
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if (bdc->gadget_driver) {
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dev_err(bdc->dev, "%s is already bound to %s\n",
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bdc->gadget.name,
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bdc->gadget_driver->driver.name);
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ret = -EBUSY;
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goto err;
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}
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/*
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* Run the controller from here and when BDC is connected to
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* Host then driver will receive a USPC SR with VBUS present
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* and then driver will do a softconnect.
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*/
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ret = bdc_run(bdc);
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if (ret) {
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dev_err(bdc->dev, "%s bdc run fail\n", __func__);
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goto err;
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}
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bdc->gadget_driver = driver;
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bdc->gadget.dev.driver = &driver->driver;
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err:
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spin_unlock_irqrestore(&bdc->lock, flags);
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return ret;
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}
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static int bdc_udc_stop(struct usb_gadget *gadget)
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{
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struct bdc *bdc = gadget_to_bdc(gadget);
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unsigned long flags;
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dev_dbg(bdc->dev, "%s()\n", __func__);
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spin_lock_irqsave(&bdc->lock, flags);
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bdc_stop(bdc);
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bdc->gadget_driver = NULL;
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bdc->gadget.dev.driver = NULL;
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spin_unlock_irqrestore(&bdc->lock, flags);
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return 0;
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}
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static int bdc_udc_pullup(struct usb_gadget *gadget, int is_on)
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{
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struct bdc *bdc = gadget_to_bdc(gadget);
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unsigned long flags;
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u32 uspc;
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dev_dbg(bdc->dev, "%s() is_on:%d\n", __func__, is_on);
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if (!gadget)
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return -EINVAL;
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spin_lock_irqsave(&bdc->lock, flags);
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if (!is_on) {
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bdc_softdisconn(bdc);
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bdc->pullup = false;
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} else {
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/*
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* For a self powered device, we need to wait till we receive
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* a VBUS change and Vbus present event, then if pullup flag
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* is set, then only we present the Termintation.
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*/
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bdc->pullup = true;
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/*
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* Check if BDC is already connected to Host i.e Vbus=1,
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* if yes, then present TERM now, this is typical for bus
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* powered devices.
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*/
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uspc = bdc_readl(bdc->regs, BDC_USPC);
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if (uspc & BDC_VBS)
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bdc_softconn(bdc);
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}
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spin_unlock_irqrestore(&bdc->lock, flags);
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return 0;
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}
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static int bdc_udc_set_selfpowered(struct usb_gadget *gadget,
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int is_self)
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{
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struct bdc *bdc = gadget_to_bdc(gadget);
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unsigned long flags;
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dev_dbg(bdc->dev, "%s()\n", __func__);
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gadget->is_selfpowered = (is_self != 0);
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spin_lock_irqsave(&bdc->lock, flags);
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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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|