| /* |
| * amd5536.c -- AMD 5536 UDC high/full speed USB device controller |
| * |
| * Copyright (C) 2005-2007 AMD (http://www.amd.com) |
| * Author: Thomas Dahlmann |
| * |
| * 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. |
| */ |
| |
| /* |
| * The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536. |
| * It is a USB Highspeed DMA capable USB device controller. Beside ep0 it |
| * provides 4 IN and 4 OUT endpoints (bulk or interrupt type). |
| * |
| * Make sure that UDC is assigned to port 4 by BIOS settings (port can also |
| * be used as host port) and UOC bits PAD_EN and APU are set (should be done |
| * by BIOS init). |
| * |
| * UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not |
| * work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0") |
| * can be used with gadget ether. |
| */ |
| |
| /* debug control */ |
| /* #define UDC_VERBOSE */ |
| |
| /* Driver strings */ |
| #define UDC_MOD_DESCRIPTION "AMD 5536 UDC - USB Device Controller" |
| #define UDC_DRIVER_VERSION_STRING "01.00.0206" |
| |
| /* system */ |
| #include <linux/module.h> |
| #include <linux/pci.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/timer.h> |
| #include <linux/list.h> |
| #include <linux/interrupt.h> |
| #include <linux/ioctl.h> |
| #include <linux/fs.h> |
| #include <linux/dmapool.h> |
| #include <linux/moduleparam.h> |
| #include <linux/device.h> |
| #include <linux/io.h> |
| #include <linux/irq.h> |
| #include <linux/prefetch.h> |
| |
| #include <asm/byteorder.h> |
| #include <asm/unaligned.h> |
| |
| /* gadget stack */ |
| #include <linux/usb/ch9.h> |
| #include <linux/usb/gadget.h> |
| |
| /* udc specific */ |
| #include "amd5536udc.h" |
| |
| |
| static void udc_tasklet_disconnect(unsigned long); |
| static void empty_req_queue(struct udc_ep *); |
| static int udc_probe(struct udc *dev); |
| static void udc_basic_init(struct udc *dev); |
| static void udc_setup_endpoints(struct udc *dev); |
| static void udc_soft_reset(struct udc *dev); |
| static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep); |
| static void udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq); |
| static int udc_free_dma_chain(struct udc *dev, struct udc_request *req); |
| static int udc_create_dma_chain(struct udc_ep *ep, struct udc_request *req, |
| unsigned long buf_len, gfp_t gfp_flags); |
| static int udc_remote_wakeup(struct udc *dev); |
| static int udc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id); |
| static void udc_pci_remove(struct pci_dev *pdev); |
| |
| /* description */ |
| static const char mod_desc[] = UDC_MOD_DESCRIPTION; |
| static const char name[] = "amd5536udc"; |
| |
| /* structure to hold endpoint function pointers */ |
| static const struct usb_ep_ops udc_ep_ops; |
| |
| /* received setup data */ |
| static union udc_setup_data setup_data; |
| |
| /* pointer to device object */ |
| static struct udc *udc; |
| |
| /* irq spin lock for soft reset */ |
| static DEFINE_SPINLOCK(udc_irq_spinlock); |
| /* stall spin lock */ |
| static DEFINE_SPINLOCK(udc_stall_spinlock); |
| |
| /* |
| * slave mode: pending bytes in rx fifo after nyet, |
| * used if EPIN irq came but no req was available |
| */ |
| static unsigned int udc_rxfifo_pending; |
| |
| /* count soft resets after suspend to avoid loop */ |
| static int soft_reset_occured; |
| static int soft_reset_after_usbreset_occured; |
| |
| /* timer */ |
| static struct timer_list udc_timer; |
| static int stop_timer; |
| |
| /* set_rde -- Is used to control enabling of RX DMA. Problem is |
| * that UDC has only one bit (RDE) to enable/disable RX DMA for |
| * all OUT endpoints. So we have to handle race conditions like |
| * when OUT data reaches the fifo but no request was queued yet. |
| * This cannot be solved by letting the RX DMA disabled until a |
| * request gets queued because there may be other OUT packets |
| * in the FIFO (important for not blocking control traffic). |
| * The value of set_rde controls the correspondig timer. |
| * |
| * set_rde -1 == not used, means it is alloed to be set to 0 or 1 |
| * set_rde 0 == do not touch RDE, do no start the RDE timer |
| * set_rde 1 == timer function will look whether FIFO has data |
| * set_rde 2 == set by timer function to enable RX DMA on next call |
| */ |
| static int set_rde = -1; |
| |
| static DECLARE_COMPLETION(on_exit); |
| static struct timer_list udc_pollstall_timer; |
| static int stop_pollstall_timer; |
| static DECLARE_COMPLETION(on_pollstall_exit); |
| |
| /* tasklet for usb disconnect */ |
| static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect, |
| (unsigned long) &udc); |
| |
| |
| /* endpoint names used for print */ |
| static const char ep0_string[] = "ep0in"; |
| static const char *const ep_string[] = { |
| ep0_string, |
| "ep1in-int", "ep2in-bulk", "ep3in-bulk", "ep4in-bulk", "ep5in-bulk", |
| "ep6in-bulk", "ep7in-bulk", "ep8in-bulk", "ep9in-bulk", "ep10in-bulk", |
| "ep11in-bulk", "ep12in-bulk", "ep13in-bulk", "ep14in-bulk", |
| "ep15in-bulk", "ep0out", "ep1out-bulk", "ep2out-bulk", "ep3out-bulk", |
| "ep4out-bulk", "ep5out-bulk", "ep6out-bulk", "ep7out-bulk", |
| "ep8out-bulk", "ep9out-bulk", "ep10out-bulk", "ep11out-bulk", |
| "ep12out-bulk", "ep13out-bulk", "ep14out-bulk", "ep15out-bulk" |
| }; |
| |
| /* DMA usage flag */ |
| static bool use_dma = 1; |
| /* packet per buffer dma */ |
| static bool use_dma_ppb = 1; |
| /* with per descr. update */ |
| static bool use_dma_ppb_du; |
| /* buffer fill mode */ |
| static int use_dma_bufferfill_mode; |
| /* full speed only mode */ |
| static bool use_fullspeed; |
| /* tx buffer size for high speed */ |
| static unsigned long hs_tx_buf = UDC_EPIN_BUFF_SIZE; |
| |
| /* module parameters */ |
| module_param(use_dma, bool, S_IRUGO); |
| MODULE_PARM_DESC(use_dma, "true for DMA"); |
| module_param(use_dma_ppb, bool, S_IRUGO); |
| MODULE_PARM_DESC(use_dma_ppb, "true for DMA in packet per buffer mode"); |
| module_param(use_dma_ppb_du, bool, S_IRUGO); |
| MODULE_PARM_DESC(use_dma_ppb_du, |
| "true for DMA in packet per buffer mode with descriptor update"); |
| module_param(use_fullspeed, bool, S_IRUGO); |
| MODULE_PARM_DESC(use_fullspeed, "true for fullspeed only"); |
| |
| /*---------------------------------------------------------------------------*/ |
| /* Prints UDC device registers and endpoint irq registers */ |
| static void print_regs(struct udc *dev) |
| { |
| DBG(dev, "------- Device registers -------\n"); |
| DBG(dev, "dev config = %08x\n", readl(&dev->regs->cfg)); |
| DBG(dev, "dev control = %08x\n", readl(&dev->regs->ctl)); |
| DBG(dev, "dev status = %08x\n", readl(&dev->regs->sts)); |
| DBG(dev, "\n"); |
| DBG(dev, "dev int's = %08x\n", readl(&dev->regs->irqsts)); |
| DBG(dev, "dev intmask = %08x\n", readl(&dev->regs->irqmsk)); |
| DBG(dev, "\n"); |
| DBG(dev, "dev ep int's = %08x\n", readl(&dev->regs->ep_irqsts)); |
| DBG(dev, "dev ep intmask = %08x\n", readl(&dev->regs->ep_irqmsk)); |
| DBG(dev, "\n"); |
| DBG(dev, "USE DMA = %d\n", use_dma); |
| if (use_dma && use_dma_ppb && !use_dma_ppb_du) { |
| DBG(dev, "DMA mode = PPBNDU (packet per buffer " |
| "WITHOUT desc. update)\n"); |
| dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBNDU"); |
| } else if (use_dma && use_dma_ppb && use_dma_ppb_du) { |
| DBG(dev, "DMA mode = PPBDU (packet per buffer " |
| "WITH desc. update)\n"); |
| dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBDU"); |
| } |
| if (use_dma && use_dma_bufferfill_mode) { |
| DBG(dev, "DMA mode = BF (buffer fill mode)\n"); |
| dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "BF"); |
| } |
| if (!use_dma) |
| dev_info(&dev->pdev->dev, "FIFO mode\n"); |
| DBG(dev, "-------------------------------------------------------\n"); |
| } |
| |
| /* Masks unused interrupts */ |
| static int udc_mask_unused_interrupts(struct udc *dev) |
| { |
| u32 tmp; |
| |
| /* mask all dev interrupts */ |
| tmp = AMD_BIT(UDC_DEVINT_SVC) | |
| AMD_BIT(UDC_DEVINT_ENUM) | |
| AMD_BIT(UDC_DEVINT_US) | |
| AMD_BIT(UDC_DEVINT_UR) | |
| AMD_BIT(UDC_DEVINT_ES) | |
| AMD_BIT(UDC_DEVINT_SI) | |
| AMD_BIT(UDC_DEVINT_SOF)| |
| AMD_BIT(UDC_DEVINT_SC); |
| writel(tmp, &dev->regs->irqmsk); |
| |
| /* mask all ep interrupts */ |
| writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqmsk); |
| |
| return 0; |
| } |
| |
| /* Enables endpoint 0 interrupts */ |
| static int udc_enable_ep0_interrupts(struct udc *dev) |
| { |
| u32 tmp; |
| |
| DBG(dev, "udc_enable_ep0_interrupts()\n"); |
| |
| /* read irq mask */ |
| tmp = readl(&dev->regs->ep_irqmsk); |
| /* enable ep0 irq's */ |
| tmp &= AMD_UNMASK_BIT(UDC_EPINT_IN_EP0) |
| & AMD_UNMASK_BIT(UDC_EPINT_OUT_EP0); |
| writel(tmp, &dev->regs->ep_irqmsk); |
| |
| return 0; |
| } |
| |
| /* Enables device interrupts for SET_INTF and SET_CONFIG */ |
| static int udc_enable_dev_setup_interrupts(struct udc *dev) |
| { |
| u32 tmp; |
| |
| DBG(dev, "enable device interrupts for setup data\n"); |
| |
| /* read irq mask */ |
| tmp = readl(&dev->regs->irqmsk); |
| |
| /* enable SET_INTERFACE, SET_CONFIG and other needed irq's */ |
| tmp &= AMD_UNMASK_BIT(UDC_DEVINT_SI) |
| & AMD_UNMASK_BIT(UDC_DEVINT_SC) |
| & AMD_UNMASK_BIT(UDC_DEVINT_UR) |
| & AMD_UNMASK_BIT(UDC_DEVINT_SVC) |
| & AMD_UNMASK_BIT(UDC_DEVINT_ENUM); |
| writel(tmp, &dev->regs->irqmsk); |
| |
| return 0; |
| } |
| |
| /* Calculates fifo start of endpoint based on preceding endpoints */ |
| static int udc_set_txfifo_addr(struct udc_ep *ep) |
| { |
| struct udc *dev; |
| u32 tmp; |
| int i; |
| |
| if (!ep || !(ep->in)) |
| return -EINVAL; |
| |
| dev = ep->dev; |
| ep->txfifo = dev->txfifo; |
| |
| /* traverse ep's */ |
| for (i = 0; i < ep->num; i++) { |
| if (dev->ep[i].regs) { |
| /* read fifo size */ |
| tmp = readl(&dev->ep[i].regs->bufin_framenum); |
| tmp = AMD_GETBITS(tmp, UDC_EPIN_BUFF_SIZE); |
| ep->txfifo += tmp; |
| } |
| } |
| return 0; |
| } |
| |
| /* CNAK pending field: bit0 = ep0in, bit16 = ep0out */ |
| static u32 cnak_pending; |
| |
| static void UDC_QUEUE_CNAK(struct udc_ep *ep, unsigned num) |
| { |
| if (readl(&ep->regs->ctl) & AMD_BIT(UDC_EPCTL_NAK)) { |
| DBG(ep->dev, "NAK could not be cleared for ep%d\n", num); |
| cnak_pending |= 1 << (num); |
| ep->naking = 1; |
| } else |
| cnak_pending = cnak_pending & (~(1 << (num))); |
| } |
| |
| |
| /* Enables endpoint, is called by gadget driver */ |
| static int |
| udc_ep_enable(struct usb_ep *usbep, const struct usb_endpoint_descriptor *desc) |
| { |
| struct udc_ep *ep; |
| struct udc *dev; |
| u32 tmp; |
| unsigned long iflags; |
| u8 udc_csr_epix; |
| unsigned maxpacket; |
| |
| if (!usbep |
| || usbep->name == ep0_string |
| || !desc |
| || desc->bDescriptorType != USB_DT_ENDPOINT) |
| return -EINVAL; |
| |
| ep = container_of(usbep, struct udc_ep, ep); |
| dev = ep->dev; |
| |
| DBG(dev, "udc_ep_enable() ep %d\n", ep->num); |
| |
| if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) |
| return -ESHUTDOWN; |
| |
| spin_lock_irqsave(&dev->lock, iflags); |
| ep->ep.desc = desc; |
| |
| ep->halted = 0; |
| |
| /* set traffic type */ |
| tmp = readl(&dev->ep[ep->num].regs->ctl); |
| tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_EPCTL_ET); |
| writel(tmp, &dev->ep[ep->num].regs->ctl); |
| |
| /* set max packet size */ |
| maxpacket = usb_endpoint_maxp(desc); |
| tmp = readl(&dev->ep[ep->num].regs->bufout_maxpkt); |
| tmp = AMD_ADDBITS(tmp, maxpacket, UDC_EP_MAX_PKT_SIZE); |
| ep->ep.maxpacket = maxpacket; |
| writel(tmp, &dev->ep[ep->num].regs->bufout_maxpkt); |
| |
| /* IN ep */ |
| if (ep->in) { |
| |
| /* ep ix in UDC CSR register space */ |
| udc_csr_epix = ep->num; |
| |
| /* set buffer size (tx fifo entries) */ |
| tmp = readl(&dev->ep[ep->num].regs->bufin_framenum); |
| /* double buffering: fifo size = 2 x max packet size */ |
| tmp = AMD_ADDBITS( |
| tmp, |
| maxpacket * UDC_EPIN_BUFF_SIZE_MULT |
| / UDC_DWORD_BYTES, |
| UDC_EPIN_BUFF_SIZE); |
| writel(tmp, &dev->ep[ep->num].regs->bufin_framenum); |
| |
| /* calc. tx fifo base addr */ |
| udc_set_txfifo_addr(ep); |
| |
| /* flush fifo */ |
| tmp = readl(&ep->regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_F); |
| writel(tmp, &ep->regs->ctl); |
| |
| /* OUT ep */ |
| } else { |
| /* ep ix in UDC CSR register space */ |
| udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS; |
| |
| /* set max packet size UDC CSR */ |
| tmp = readl(&dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]); |
| tmp = AMD_ADDBITS(tmp, maxpacket, |
| UDC_CSR_NE_MAX_PKT); |
| writel(tmp, &dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]); |
| |
| if (use_dma && !ep->in) { |
| /* alloc and init BNA dummy request */ |
| ep->bna_dummy_req = udc_alloc_bna_dummy(ep); |
| ep->bna_occurred = 0; |
| } |
| |
| if (ep->num != UDC_EP0OUT_IX) |
| dev->data_ep_enabled = 1; |
| } |
| |
| /* set ep values */ |
| tmp = readl(&dev->csr->ne[udc_csr_epix]); |
| /* max packet */ |
| tmp = AMD_ADDBITS(tmp, maxpacket, UDC_CSR_NE_MAX_PKT); |
| /* ep number */ |
| tmp = AMD_ADDBITS(tmp, desc->bEndpointAddress, UDC_CSR_NE_NUM); |
| /* ep direction */ |
| tmp = AMD_ADDBITS(tmp, ep->in, UDC_CSR_NE_DIR); |
| /* ep type */ |
| tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_CSR_NE_TYPE); |
| /* ep config */ |
| tmp = AMD_ADDBITS(tmp, ep->dev->cur_config, UDC_CSR_NE_CFG); |
| /* ep interface */ |
| tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf, UDC_CSR_NE_INTF); |
| /* ep alt */ |
| tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt, UDC_CSR_NE_ALT); |
| /* write reg */ |
| writel(tmp, &dev->csr->ne[udc_csr_epix]); |
| |
| /* enable ep irq */ |
| tmp = readl(&dev->regs->ep_irqmsk); |
| tmp &= AMD_UNMASK_BIT(ep->num); |
| writel(tmp, &dev->regs->ep_irqmsk); |
| |
| /* |
| * clear NAK by writing CNAK |
| * avoid BNA for OUT DMA, don't clear NAK until DMA desc. written |
| */ |
| if (!use_dma || ep->in) { |
| tmp = readl(&ep->regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &ep->regs->ctl); |
| ep->naking = 0; |
| UDC_QUEUE_CNAK(ep, ep->num); |
| } |
| tmp = desc->bEndpointAddress; |
| DBG(dev, "%s enabled\n", usbep->name); |
| |
| spin_unlock_irqrestore(&dev->lock, iflags); |
| return 0; |
| } |
| |
| /* Resets endpoint */ |
| static void ep_init(struct udc_regs __iomem *regs, struct udc_ep *ep) |
| { |
| u32 tmp; |
| |
| VDBG(ep->dev, "ep-%d reset\n", ep->num); |
| ep->ep.desc = NULL; |
| ep->ep.ops = &udc_ep_ops; |
| INIT_LIST_HEAD(&ep->queue); |
| |
| usb_ep_set_maxpacket_limit(&ep->ep,(u16) ~0); |
| /* set NAK */ |
| tmp = readl(&ep->regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_SNAK); |
| writel(tmp, &ep->regs->ctl); |
| ep->naking = 1; |
| |
| /* disable interrupt */ |
| tmp = readl(®s->ep_irqmsk); |
| tmp |= AMD_BIT(ep->num); |
| writel(tmp, ®s->ep_irqmsk); |
| |
| if (ep->in) { |
| /* unset P and IN bit of potential former DMA */ |
| tmp = readl(&ep->regs->ctl); |
| tmp &= AMD_UNMASK_BIT(UDC_EPCTL_P); |
| writel(tmp, &ep->regs->ctl); |
| |
| tmp = readl(&ep->regs->sts); |
| tmp |= AMD_BIT(UDC_EPSTS_IN); |
| writel(tmp, &ep->regs->sts); |
| |
| /* flush the fifo */ |
| tmp = readl(&ep->regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_F); |
| writel(tmp, &ep->regs->ctl); |
| |
| } |
| /* reset desc pointer */ |
| writel(0, &ep->regs->desptr); |
| } |
| |
| /* Disables endpoint, is called by gadget driver */ |
| static int udc_ep_disable(struct usb_ep *usbep) |
| { |
| struct udc_ep *ep = NULL; |
| unsigned long iflags; |
| |
| if (!usbep) |
| return -EINVAL; |
| |
| ep = container_of(usbep, struct udc_ep, ep); |
| if (usbep->name == ep0_string || !ep->ep.desc) |
| return -EINVAL; |
| |
| DBG(ep->dev, "Disable ep-%d\n", ep->num); |
| |
| spin_lock_irqsave(&ep->dev->lock, iflags); |
| udc_free_request(&ep->ep, &ep->bna_dummy_req->req); |
| empty_req_queue(ep); |
| ep_init(ep->dev->regs, ep); |
| spin_unlock_irqrestore(&ep->dev->lock, iflags); |
| |
| return 0; |
| } |
| |
| /* Allocates request packet, called by gadget driver */ |
| static struct usb_request * |
| udc_alloc_request(struct usb_ep *usbep, gfp_t gfp) |
| { |
| struct udc_request *req; |
| struct udc_data_dma *dma_desc; |
| struct udc_ep *ep; |
| |
| if (!usbep) |
| return NULL; |
| |
| ep = container_of(usbep, struct udc_ep, ep); |
| |
| VDBG(ep->dev, "udc_alloc_req(): ep%d\n", ep->num); |
| req = kzalloc(sizeof(struct udc_request), gfp); |
| if (!req) |
| return NULL; |
| |
| req->req.dma = DMA_DONT_USE; |
| INIT_LIST_HEAD(&req->queue); |
| |
| if (ep->dma) { |
| /* ep0 in requests are allocated from data pool here */ |
| dma_desc = pci_pool_alloc(ep->dev->data_requests, gfp, |
| &req->td_phys); |
| if (!dma_desc) { |
| kfree(req); |
| return NULL; |
| } |
| |
| VDBG(ep->dev, "udc_alloc_req: req = %p dma_desc = %p, " |
| "td_phys = %lx\n", |
| req, dma_desc, |
| (unsigned long)req->td_phys); |
| /* prevent from using desc. - set HOST BUSY */ |
| dma_desc->status = AMD_ADDBITS(dma_desc->status, |
| UDC_DMA_STP_STS_BS_HOST_BUSY, |
| UDC_DMA_STP_STS_BS); |
| dma_desc->bufptr = cpu_to_le32(DMA_DONT_USE); |
| req->td_data = dma_desc; |
| req->td_data_last = NULL; |
| req->chain_len = 1; |
| } |
| |
| return &req->req; |
| } |
| |
| /* Frees request packet, called by gadget driver */ |
| static void |
| udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq) |
| { |
| struct udc_ep *ep; |
| struct udc_request *req; |
| |
| if (!usbep || !usbreq) |
| return; |
| |
| ep = container_of(usbep, struct udc_ep, ep); |
| req = container_of(usbreq, struct udc_request, req); |
| VDBG(ep->dev, "free_req req=%p\n", req); |
| BUG_ON(!list_empty(&req->queue)); |
| if (req->td_data) { |
| VDBG(ep->dev, "req->td_data=%p\n", req->td_data); |
| |
| /* free dma chain if created */ |
| if (req->chain_len > 1) |
| udc_free_dma_chain(ep->dev, req); |
| |
| pci_pool_free(ep->dev->data_requests, req->td_data, |
| req->td_phys); |
| } |
| kfree(req); |
| } |
| |
| /* Init BNA dummy descriptor for HOST BUSY and pointing to itself */ |
| static void udc_init_bna_dummy(struct udc_request *req) |
| { |
| if (req) { |
| /* set last bit */ |
| req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L); |
| /* set next pointer to itself */ |
| req->td_data->next = req->td_phys; |
| /* set HOST BUSY */ |
| req->td_data->status |
| = AMD_ADDBITS(req->td_data->status, |
| UDC_DMA_STP_STS_BS_DMA_DONE, |
| UDC_DMA_STP_STS_BS); |
| #ifdef UDC_VERBOSE |
| pr_debug("bna desc = %p, sts = %08x\n", |
| req->td_data, req->td_data->status); |
| #endif |
| } |
| } |
| |
| /* Allocate BNA dummy descriptor */ |
| static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep) |
| { |
| struct udc_request *req = NULL; |
| struct usb_request *_req = NULL; |
| |
| /* alloc the dummy request */ |
| _req = udc_alloc_request(&ep->ep, GFP_ATOMIC); |
| if (_req) { |
| req = container_of(_req, struct udc_request, req); |
| ep->bna_dummy_req = req; |
| udc_init_bna_dummy(req); |
| } |
| return req; |
| } |
| |
| /* Write data to TX fifo for IN packets */ |
| static void |
| udc_txfifo_write(struct udc_ep *ep, struct usb_request *req) |
| { |
| u8 *req_buf; |
| u32 *buf; |
| int i, j; |
| unsigned bytes = 0; |
| unsigned remaining = 0; |
| |
| if (!req || !ep) |
| return; |
| |
| req_buf = req->buf + req->actual; |
| prefetch(req_buf); |
| remaining = req->length - req->actual; |
| |
| buf = (u32 *) req_buf; |
| |
| bytes = ep->ep.maxpacket; |
| if (bytes > remaining) |
| bytes = remaining; |
| |
| /* dwords first */ |
| for (i = 0; i < bytes / UDC_DWORD_BYTES; i++) |
| writel(*(buf + i), ep->txfifo); |
| |
| /* remaining bytes must be written by byte access */ |
| for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) { |
| writeb((u8)(*(buf + i) >> (j << UDC_BITS_PER_BYTE_SHIFT)), |
| ep->txfifo); |
| } |
| |
| /* dummy write confirm */ |
| writel(0, &ep->regs->confirm); |
| } |
| |
| /* Read dwords from RX fifo for OUT transfers */ |
| static int udc_rxfifo_read_dwords(struct udc *dev, u32 *buf, int dwords) |
| { |
| int i; |
| |
| VDBG(dev, "udc_read_dwords(): %d dwords\n", dwords); |
| |
| for (i = 0; i < dwords; i++) |
| *(buf + i) = readl(dev->rxfifo); |
| return 0; |
| } |
| |
| /* Read bytes from RX fifo for OUT transfers */ |
| static int udc_rxfifo_read_bytes(struct udc *dev, u8 *buf, int bytes) |
| { |
| int i, j; |
| u32 tmp; |
| |
| VDBG(dev, "udc_read_bytes(): %d bytes\n", bytes); |
| |
| /* dwords first */ |
| for (i = 0; i < bytes / UDC_DWORD_BYTES; i++) |
| *((u32 *)(buf + (i<<2))) = readl(dev->rxfifo); |
| |
| /* remaining bytes must be read by byte access */ |
| if (bytes % UDC_DWORD_BYTES) { |
| tmp = readl(dev->rxfifo); |
| for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) { |
| *(buf + (i<<2) + j) = (u8)(tmp & UDC_BYTE_MASK); |
| tmp = tmp >> UDC_BITS_PER_BYTE; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* Read data from RX fifo for OUT transfers */ |
| static int |
| udc_rxfifo_read(struct udc_ep *ep, struct udc_request *req) |
| { |
| u8 *buf; |
| unsigned buf_space; |
| unsigned bytes = 0; |
| unsigned finished = 0; |
| |
| /* received number bytes */ |
| bytes = readl(&ep->regs->sts); |
| bytes = AMD_GETBITS(bytes, UDC_EPSTS_RX_PKT_SIZE); |
| |
| buf_space = req->req.length - req->req.actual; |
| buf = req->req.buf + req->req.actual; |
| if (bytes > buf_space) { |
| if ((buf_space % ep->ep.maxpacket) != 0) { |
| DBG(ep->dev, |
| "%s: rx %d bytes, rx-buf space = %d bytesn\n", |
| ep->ep.name, bytes, buf_space); |
| req->req.status = -EOVERFLOW; |
| } |
| bytes = buf_space; |
| } |
| req->req.actual += bytes; |
| |
| /* last packet ? */ |
| if (((bytes % ep->ep.maxpacket) != 0) || (!bytes) |
| || ((req->req.actual == req->req.length) && !req->req.zero)) |
| finished = 1; |
| |
| /* read rx fifo bytes */ |
| VDBG(ep->dev, "ep %s: rxfifo read %d bytes\n", ep->ep.name, bytes); |
| udc_rxfifo_read_bytes(ep->dev, buf, bytes); |
| |
| return finished; |
| } |
| |
| /* create/re-init a DMA descriptor or a DMA descriptor chain */ |
| static int prep_dma(struct udc_ep *ep, struct udc_request *req, gfp_t gfp) |
| { |
| int retval = 0; |
| u32 tmp; |
| |
| VDBG(ep->dev, "prep_dma\n"); |
| VDBG(ep->dev, "prep_dma ep%d req->td_data=%p\n", |
| ep->num, req->td_data); |
| |
| /* set buffer pointer */ |
| req->td_data->bufptr = req->req.dma; |
| |
| /* set last bit */ |
| req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L); |
| |
| /* build/re-init dma chain if maxpkt scatter mode, not for EP0 */ |
| if (use_dma_ppb) { |
| |
| retval = udc_create_dma_chain(ep, req, ep->ep.maxpacket, gfp); |
| if (retval != 0) { |
| if (retval == -ENOMEM) |
| DBG(ep->dev, "Out of DMA memory\n"); |
| return retval; |
| } |
| if (ep->in) { |
| if (req->req.length == ep->ep.maxpacket) { |
| /* write tx bytes */ |
| req->td_data->status = |
| AMD_ADDBITS(req->td_data->status, |
| ep->ep.maxpacket, |
| UDC_DMA_IN_STS_TXBYTES); |
| |
| } |
| } |
| |
| } |
| |
| if (ep->in) { |
| VDBG(ep->dev, "IN: use_dma_ppb=%d req->req.len=%d " |
| "maxpacket=%d ep%d\n", |
| use_dma_ppb, req->req.length, |
| ep->ep.maxpacket, ep->num); |
| /* |
| * if bytes < max packet then tx bytes must |
| * be written in packet per buffer mode |
| */ |
| if (!use_dma_ppb || req->req.length < ep->ep.maxpacket |
| || ep->num == UDC_EP0OUT_IX |
| || ep->num == UDC_EP0IN_IX) { |
| /* write tx bytes */ |
| req->td_data->status = |
| AMD_ADDBITS(req->td_data->status, |
| req->req.length, |
| UDC_DMA_IN_STS_TXBYTES); |
| /* reset frame num */ |
| req->td_data->status = |
| AMD_ADDBITS(req->td_data->status, |
| 0, |
| UDC_DMA_IN_STS_FRAMENUM); |
| } |
| /* set HOST BUSY */ |
| req->td_data->status = |
| AMD_ADDBITS(req->td_data->status, |
| UDC_DMA_STP_STS_BS_HOST_BUSY, |
| UDC_DMA_STP_STS_BS); |
| } else { |
| VDBG(ep->dev, "OUT set host ready\n"); |
| /* set HOST READY */ |
| req->td_data->status = |
| AMD_ADDBITS(req->td_data->status, |
| UDC_DMA_STP_STS_BS_HOST_READY, |
| UDC_DMA_STP_STS_BS); |
| |
| |
| /* clear NAK by writing CNAK */ |
| if (ep->naking) { |
| tmp = readl(&ep->regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &ep->regs->ctl); |
| ep->naking = 0; |
| UDC_QUEUE_CNAK(ep, ep->num); |
| } |
| |
| } |
| |
| return retval; |
| } |
| |
| /* Completes request packet ... caller MUST hold lock */ |
| static void |
| complete_req(struct udc_ep *ep, struct udc_request *req, int sts) |
| __releases(ep->dev->lock) |
| __acquires(ep->dev->lock) |
| { |
| struct udc *dev; |
| unsigned halted; |
| |
| VDBG(ep->dev, "complete_req(): ep%d\n", ep->num); |
| |
| dev = ep->dev; |
| /* unmap DMA */ |
| if (ep->dma) |
| usb_gadget_unmap_request(&dev->gadget, &req->req, ep->in); |
| |
| halted = ep->halted; |
| ep->halted = 1; |
| |
| /* set new status if pending */ |
| if (req->req.status == -EINPROGRESS) |
| req->req.status = sts; |
| |
| /* remove from ep queue */ |
| list_del_init(&req->queue); |
| |
| VDBG(ep->dev, "req %p => complete %d bytes at %s with sts %d\n", |
| &req->req, req->req.length, ep->ep.name, sts); |
| |
| spin_unlock(&dev->lock); |
| req->req.complete(&ep->ep, &req->req); |
| spin_lock(&dev->lock); |
| ep->halted = halted; |
| } |
| |
| /* frees pci pool descriptors of a DMA chain */ |
| static int udc_free_dma_chain(struct udc *dev, struct udc_request *req) |
| { |
| |
| int ret_val = 0; |
| struct udc_data_dma *td; |
| struct udc_data_dma *td_last = NULL; |
| unsigned int i; |
| |
| DBG(dev, "free chain req = %p\n", req); |
| |
| /* do not free first desc., will be done by free for request */ |
| td_last = req->td_data; |
| td = phys_to_virt(td_last->next); |
| |
| for (i = 1; i < req->chain_len; i++) { |
| |
| pci_pool_free(dev->data_requests, td, |
| (dma_addr_t) td_last->next); |
| td_last = td; |
| td = phys_to_virt(td_last->next); |
| } |
| |
| return ret_val; |
| } |
| |
| /* Iterates to the end of a DMA chain and returns last descriptor */ |
| static struct udc_data_dma *udc_get_last_dma_desc(struct udc_request *req) |
| { |
| struct udc_data_dma *td; |
| |
| td = req->td_data; |
| while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) |
| td = phys_to_virt(td->next); |
| |
| return td; |
| |
| } |
| |
| /* Iterates to the end of a DMA chain and counts bytes received */ |
| static u32 udc_get_ppbdu_rxbytes(struct udc_request *req) |
| { |
| struct udc_data_dma *td; |
| u32 count; |
| |
| td = req->td_data; |
| /* received number bytes */ |
| count = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_RXBYTES); |
| |
| while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) { |
| td = phys_to_virt(td->next); |
| /* received number bytes */ |
| if (td) { |
| count += AMD_GETBITS(td->status, |
| UDC_DMA_OUT_STS_RXBYTES); |
| } |
| } |
| |
| return count; |
| |
| } |
| |
| /* Creates or re-inits a DMA chain */ |
| static int udc_create_dma_chain( |
| struct udc_ep *ep, |
| struct udc_request *req, |
| unsigned long buf_len, gfp_t gfp_flags |
| ) |
| { |
| unsigned long bytes = req->req.length; |
| unsigned int i; |
| dma_addr_t dma_addr; |
| struct udc_data_dma *td = NULL; |
| struct udc_data_dma *last = NULL; |
| unsigned long txbytes; |
| unsigned create_new_chain = 0; |
| unsigned len; |
| |
| VDBG(ep->dev, "udc_create_dma_chain: bytes=%ld buf_len=%ld\n", |
| bytes, buf_len); |
| dma_addr = DMA_DONT_USE; |
| |
| /* unset L bit in first desc for OUT */ |
| if (!ep->in) |
| req->td_data->status &= AMD_CLEAR_BIT(UDC_DMA_IN_STS_L); |
| |
| /* alloc only new desc's if not already available */ |
| len = req->req.length / ep->ep.maxpacket; |
| if (req->req.length % ep->ep.maxpacket) |
| len++; |
| |
| if (len > req->chain_len) { |
| /* shorter chain already allocated before */ |
| if (req->chain_len > 1) |
| udc_free_dma_chain(ep->dev, req); |
| req->chain_len = len; |
| create_new_chain = 1; |
| } |
| |
| td = req->td_data; |
| /* gen. required number of descriptors and buffers */ |
| for (i = buf_len; i < bytes; i += buf_len) { |
| /* create or determine next desc. */ |
| if (create_new_chain) { |
| |
| td = pci_pool_alloc(ep->dev->data_requests, |
| gfp_flags, &dma_addr); |
| if (!td) |
| return -ENOMEM; |
| |
| td->status = 0; |
| } else if (i == buf_len) { |
| /* first td */ |
| td = (struct udc_data_dma *) phys_to_virt( |
| req->td_data->next); |
| td->status = 0; |
| } else { |
| td = (struct udc_data_dma *) phys_to_virt(last->next); |
| td->status = 0; |
| } |
| |
| |
| if (td) |
| td->bufptr = req->req.dma + i; /* assign buffer */ |
| else |
| break; |
| |
| /* short packet ? */ |
| if ((bytes - i) >= buf_len) { |
| txbytes = buf_len; |
| } else { |
| /* short packet */ |
| txbytes = bytes - i; |
| } |
| |
| /* link td and assign tx bytes */ |
| if (i == buf_len) { |
| if (create_new_chain) |
| req->td_data->next = dma_addr; |
| /* |
| else |
| req->td_data->next = virt_to_phys(td); |
| */ |
| /* write tx bytes */ |
| if (ep->in) { |
| /* first desc */ |
| req->td_data->status = |
| AMD_ADDBITS(req->td_data->status, |
| ep->ep.maxpacket, |
| UDC_DMA_IN_STS_TXBYTES); |
| /* second desc */ |
| td->status = AMD_ADDBITS(td->status, |
| txbytes, |
| UDC_DMA_IN_STS_TXBYTES); |
| } |
| } else { |
| if (create_new_chain) |
| last->next = dma_addr; |
| /* |
| else |
| last->next = virt_to_phys(td); |
| */ |
| if (ep->in) { |
| /* write tx bytes */ |
| td->status = AMD_ADDBITS(td->status, |
| txbytes, |
| UDC_DMA_IN_STS_TXBYTES); |
| } |
| } |
| last = td; |
| } |
| /* set last bit */ |
| if (td) { |
| td->status |= AMD_BIT(UDC_DMA_IN_STS_L); |
| /* last desc. points to itself */ |
| req->td_data_last = td; |
| } |
| |
| return 0; |
| } |
| |
| /* Enabling RX DMA */ |
| static void udc_set_rde(struct udc *dev) |
| { |
| u32 tmp; |
| |
| VDBG(dev, "udc_set_rde()\n"); |
| /* stop RDE timer */ |
| if (timer_pending(&udc_timer)) { |
| set_rde = 0; |
| mod_timer(&udc_timer, jiffies - 1); |
| } |
| /* set RDE */ |
| tmp = readl(&dev->regs->ctl); |
| tmp |= AMD_BIT(UDC_DEVCTL_RDE); |
| writel(tmp, &dev->regs->ctl); |
| } |
| |
| /* Queues a request packet, called by gadget driver */ |
| static int |
| udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp) |
| { |
| int retval = 0; |
| u8 open_rxfifo = 0; |
| unsigned long iflags; |
| struct udc_ep *ep; |
| struct udc_request *req; |
| struct udc *dev; |
| u32 tmp; |
| |
| /* check the inputs */ |
| req = container_of(usbreq, struct udc_request, req); |
| |
| if (!usbep || !usbreq || !usbreq->complete || !usbreq->buf |
| || !list_empty(&req->queue)) |
| return -EINVAL; |
| |
| ep = container_of(usbep, struct udc_ep, ep); |
| if (!ep->ep.desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX)) |
| return -EINVAL; |
| |
| VDBG(ep->dev, "udc_queue(): ep%d-in=%d\n", ep->num, ep->in); |
| dev = ep->dev; |
| |
| if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) |
| return -ESHUTDOWN; |
| |
| /* map dma (usually done before) */ |
| if (ep->dma) { |
| VDBG(dev, "DMA map req %p\n", req); |
| retval = usb_gadget_map_request(&udc->gadget, usbreq, ep->in); |
| if (retval) |
| return retval; |
| } |
| |
| VDBG(dev, "%s queue req %p, len %d req->td_data=%p buf %p\n", |
| usbep->name, usbreq, usbreq->length, |
| req->td_data, usbreq->buf); |
| |
| spin_lock_irqsave(&dev->lock, iflags); |
| usbreq->actual = 0; |
| usbreq->status = -EINPROGRESS; |
| req->dma_done = 0; |
| |
| /* on empty queue just do first transfer */ |
| if (list_empty(&ep->queue)) { |
| /* zlp */ |
| if (usbreq->length == 0) { |
| /* IN zlp's are handled by hardware */ |
| complete_req(ep, req, 0); |
| VDBG(dev, "%s: zlp\n", ep->ep.name); |
| /* |
| * if set_config or set_intf is waiting for ack by zlp |
| * then set CSR_DONE |
| */ |
| if (dev->set_cfg_not_acked) { |
| tmp = readl(&dev->regs->ctl); |
| tmp |= AMD_BIT(UDC_DEVCTL_CSR_DONE); |
| writel(tmp, &dev->regs->ctl); |
| dev->set_cfg_not_acked = 0; |
| } |
| /* setup command is ACK'ed now by zlp */ |
| if (dev->waiting_zlp_ack_ep0in) { |
| /* clear NAK by writing CNAK in EP0_IN */ |
| tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl); |
| dev->ep[UDC_EP0IN_IX].naking = 0; |
| UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], |
| UDC_EP0IN_IX); |
| dev->waiting_zlp_ack_ep0in = 0; |
| } |
| goto finished; |
| } |
| if (ep->dma) { |
| retval = prep_dma(ep, req, GFP_ATOMIC); |
| if (retval != 0) |
| goto finished; |
| /* write desc pointer to enable DMA */ |
| if (ep->in) { |
| /* set HOST READY */ |
| req->td_data->status = |
| AMD_ADDBITS(req->td_data->status, |
| UDC_DMA_IN_STS_BS_HOST_READY, |
| UDC_DMA_IN_STS_BS); |
| } |
| |
| /* disabled rx dma while descriptor update */ |
| if (!ep->in) { |
| /* stop RDE timer */ |
| if (timer_pending(&udc_timer)) { |
| set_rde = 0; |
| mod_timer(&udc_timer, jiffies - 1); |
| } |
| /* clear RDE */ |
| tmp = readl(&dev->regs->ctl); |
| tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE); |
| writel(tmp, &dev->regs->ctl); |
| open_rxfifo = 1; |
| |
| /* |
| * if BNA occurred then let BNA dummy desc. |
| * point to current desc. |
| */ |
| if (ep->bna_occurred) { |
| VDBG(dev, "copy to BNA dummy desc.\n"); |
| memcpy(ep->bna_dummy_req->td_data, |
| req->td_data, |
| sizeof(struct udc_data_dma)); |
| } |
| } |
| /* write desc pointer */ |
| writel(req->td_phys, &ep->regs->desptr); |
| |
| /* clear NAK by writing CNAK */ |
| if (ep->naking) { |
| tmp = readl(&ep->regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &ep->regs->ctl); |
| ep->naking = 0; |
| UDC_QUEUE_CNAK(ep, ep->num); |
| } |
| |
| if (ep->in) { |
| /* enable ep irq */ |
| tmp = readl(&dev->regs->ep_irqmsk); |
| tmp &= AMD_UNMASK_BIT(ep->num); |
| writel(tmp, &dev->regs->ep_irqmsk); |
| } |
| } else if (ep->in) { |
| /* enable ep irq */ |
| tmp = readl(&dev->regs->ep_irqmsk); |
| tmp &= AMD_UNMASK_BIT(ep->num); |
| writel(tmp, &dev->regs->ep_irqmsk); |
| } |
| |
| } else if (ep->dma) { |
| |
| /* |
| * prep_dma not used for OUT ep's, this is not possible |
| * for PPB modes, because of chain creation reasons |
| */ |
| if (ep->in) { |
| retval = prep_dma(ep, req, GFP_ATOMIC); |
| if (retval != 0) |
| goto finished; |
| } |
| } |
| VDBG(dev, "list_add\n"); |
| /* add request to ep queue */ |
| if (req) { |
| |
| list_add_tail(&req->queue, &ep->queue); |
| |
| /* open rxfifo if out data queued */ |
| if (open_rxfifo) { |
| /* enable DMA */ |
| req->dma_going = 1; |
| udc_set_rde(dev); |
| if (ep->num != UDC_EP0OUT_IX) |
| dev->data_ep_queued = 1; |
| } |
| /* stop OUT naking */ |
| if (!ep->in) { |
| if (!use_dma && udc_rxfifo_pending) { |
| DBG(dev, "udc_queue(): pending bytes in " |
| "rxfifo after nyet\n"); |
| /* |
| * read pending bytes afer nyet: |
| * referring to isr |
| */ |
| if (udc_rxfifo_read(ep, req)) { |
| /* finish */ |
| complete_req(ep, req, 0); |
| } |
| udc_rxfifo_pending = 0; |
| |
| } |
| } |
| } |
| |
| finished: |
| spin_unlock_irqrestore(&dev->lock, iflags); |
| return retval; |
| } |
| |
| /* Empty request queue of an endpoint; caller holds spinlock */ |
| static void empty_req_queue(struct udc_ep *ep) |
| { |
| struct udc_request *req; |
| |
| ep->halted = 1; |
| while (!list_empty(&ep->queue)) { |
| req = list_entry(ep->queue.next, |
| struct udc_request, |
| queue); |
| complete_req(ep, req, -ESHUTDOWN); |
| } |
| } |
| |
| /* Dequeues a request packet, called by gadget driver */ |
| static int udc_dequeue(struct usb_ep *usbep, struct usb_request *usbreq) |
| { |
| struct udc_ep *ep; |
| struct udc_request *req; |
| unsigned halted; |
| unsigned long iflags; |
| |
| ep = container_of(usbep, struct udc_ep, ep); |
| if (!usbep || !usbreq || (!ep->ep.desc && (ep->num != 0 |
| && ep->num != UDC_EP0OUT_IX))) |
| return -EINVAL; |
| |
| req = container_of(usbreq, struct udc_request, req); |
| |
| spin_lock_irqsave(&ep->dev->lock, iflags); |
| halted = ep->halted; |
| ep->halted = 1; |
| /* request in processing or next one */ |
| if (ep->queue.next == &req->queue) { |
| if (ep->dma && req->dma_going) { |
| if (ep->in) |
| ep->cancel_transfer = 1; |
| else { |
| u32 tmp; |
| u32 dma_sts; |
| /* stop potential receive DMA */ |
| tmp = readl(&udc->regs->ctl); |
| writel(tmp & AMD_UNMASK_BIT(UDC_DEVCTL_RDE), |
| &udc->regs->ctl); |
| /* |
| * Cancel transfer later in ISR |
| * if descriptor was touched. |
| */ |
| dma_sts = AMD_GETBITS(req->td_data->status, |
| UDC_DMA_OUT_STS_BS); |
| if (dma_sts != UDC_DMA_OUT_STS_BS_HOST_READY) |
| ep->cancel_transfer = 1; |
| else { |
| udc_init_bna_dummy(ep->req); |
| writel(ep->bna_dummy_req->td_phys, |
| &ep->regs->desptr); |
| } |
| writel(tmp, &udc->regs->ctl); |
| } |
| } |
| } |
| complete_req(ep, req, -ECONNRESET); |
| ep->halted = halted; |
| |
| spin_unlock_irqrestore(&ep->dev->lock, iflags); |
| return 0; |
| } |
| |
| /* Halt or clear halt of endpoint */ |
| static int |
| udc_set_halt(struct usb_ep *usbep, int halt) |
| { |
| struct udc_ep *ep; |
| u32 tmp; |
| unsigned long iflags; |
| int retval = 0; |
| |
| if (!usbep) |
| return -EINVAL; |
| |
| pr_debug("set_halt %s: halt=%d\n", usbep->name, halt); |
| |
| ep = container_of(usbep, struct udc_ep, ep); |
| if (!ep->ep.desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX)) |
| return -EINVAL; |
| if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) |
| return -ESHUTDOWN; |
| |
| spin_lock_irqsave(&udc_stall_spinlock, iflags); |
| /* halt or clear halt */ |
| if (halt) { |
| if (ep->num == 0) |
| ep->dev->stall_ep0in = 1; |
| else { |
| /* |
| * set STALL |
| * rxfifo empty not taken into acount |
| */ |
| tmp = readl(&ep->regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_S); |
| writel(tmp, &ep->regs->ctl); |
| ep->halted = 1; |
| |
| /* setup poll timer */ |
| if (!timer_pending(&udc_pollstall_timer)) { |
| udc_pollstall_timer.expires = jiffies + |
| HZ * UDC_POLLSTALL_TIMER_USECONDS |
| / (1000 * 1000); |
| if (!stop_pollstall_timer) { |
| DBG(ep->dev, "start polltimer\n"); |
| add_timer(&udc_pollstall_timer); |
| } |
| } |
| } |
| } else { |
| /* ep is halted by set_halt() before */ |
| if (ep->halted) { |
| tmp = readl(&ep->regs->ctl); |
| /* clear stall bit */ |
| tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S); |
| /* clear NAK by writing CNAK */ |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &ep->regs->ctl); |
| ep->halted = 0; |
| UDC_QUEUE_CNAK(ep, ep->num); |
| } |
| } |
| spin_unlock_irqrestore(&udc_stall_spinlock, iflags); |
| return retval; |
| } |
| |
| /* gadget interface */ |
| static const struct usb_ep_ops udc_ep_ops = { |
| .enable = udc_ep_enable, |
| .disable = udc_ep_disable, |
| |
| .alloc_request = udc_alloc_request, |
| .free_request = udc_free_request, |
| |
| .queue = udc_queue, |
| .dequeue = udc_dequeue, |
| |
| .set_halt = udc_set_halt, |
| /* fifo ops not implemented */ |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* Get frame counter (not implemented) */ |
| static int udc_get_frame(struct usb_gadget *gadget) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| /* Remote wakeup gadget interface */ |
| static int udc_wakeup(struct usb_gadget *gadget) |
| { |
| struct udc *dev; |
| |
| if (!gadget) |
| return -EINVAL; |
| dev = container_of(gadget, struct udc, gadget); |
| udc_remote_wakeup(dev); |
| |
| return 0; |
| } |
| |
| static int amd5536_udc_start(struct usb_gadget *g, |
| struct usb_gadget_driver *driver); |
| static int amd5536_udc_stop(struct usb_gadget *g, |
| struct usb_gadget_driver *driver); |
| /* gadget operations */ |
| static const struct usb_gadget_ops udc_ops = { |
| .wakeup = udc_wakeup, |
| .get_frame = udc_get_frame, |
| .udc_start = amd5536_udc_start, |
| .udc_stop = amd5536_udc_stop, |
| }; |
| |
| /* Setups endpoint parameters, adds endpoints to linked list */ |
| static void make_ep_lists(struct udc *dev) |
| { |
| /* make gadget ep lists */ |
| INIT_LIST_HEAD(&dev->gadget.ep_list); |
| list_add_tail(&dev->ep[UDC_EPIN_STATUS_IX].ep.ep_list, |
| &dev->gadget.ep_list); |
| list_add_tail(&dev->ep[UDC_EPIN_IX].ep.ep_list, |
| &dev->gadget.ep_list); |
| list_add_tail(&dev->ep[UDC_EPOUT_IX].ep.ep_list, |
| &dev->gadget.ep_list); |
| |
| /* fifo config */ |
| dev->ep[UDC_EPIN_STATUS_IX].fifo_depth = UDC_EPIN_SMALLINT_BUFF_SIZE; |
| if (dev->gadget.speed == USB_SPEED_FULL) |
| dev->ep[UDC_EPIN_IX].fifo_depth = UDC_FS_EPIN_BUFF_SIZE; |
| else if (dev->gadget.speed == USB_SPEED_HIGH) |
| dev->ep[UDC_EPIN_IX].fifo_depth = hs_tx_buf; |
| dev->ep[UDC_EPOUT_IX].fifo_depth = UDC_RXFIFO_SIZE; |
| } |
| |
| /* init registers at driver load time */ |
| static int startup_registers(struct udc *dev) |
| { |
| u32 tmp; |
| |
| /* init controller by soft reset */ |
| udc_soft_reset(dev); |
| |
| /* mask not needed interrupts */ |
| udc_mask_unused_interrupts(dev); |
| |
| /* put into initial config */ |
| udc_basic_init(dev); |
| /* link up all endpoints */ |
| udc_setup_endpoints(dev); |
| |
| /* program speed */ |
| tmp = readl(&dev->regs->cfg); |
| if (use_fullspeed) |
| tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD); |
| else |
| tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_HS, UDC_DEVCFG_SPD); |
| writel(tmp, &dev->regs->cfg); |
| |
| return 0; |
| } |
| |
| /* Inits UDC context */ |
| static void udc_basic_init(struct udc *dev) |
| { |
| u32 tmp; |
| |
| DBG(dev, "udc_basic_init()\n"); |
| |
| dev->gadget.speed = USB_SPEED_UNKNOWN; |
| |
| /* stop RDE timer */ |
| if (timer_pending(&udc_timer)) { |
| set_rde = 0; |
| mod_timer(&udc_timer, jiffies - 1); |
| } |
| /* stop poll stall timer */ |
| if (timer_pending(&udc_pollstall_timer)) |
| mod_timer(&udc_pollstall_timer, jiffies - 1); |
| /* disable DMA */ |
| tmp = readl(&dev->regs->ctl); |
| tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE); |
| tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_TDE); |
| writel(tmp, &dev->regs->ctl); |
| |
| /* enable dynamic CSR programming */ |
| tmp = readl(&dev->regs->cfg); |
| tmp |= AMD_BIT(UDC_DEVCFG_CSR_PRG); |
| /* set self powered */ |
| tmp |= AMD_BIT(UDC_DEVCFG_SP); |
| /* set remote wakeupable */ |
| tmp |= AMD_BIT(UDC_DEVCFG_RWKP); |
| writel(tmp, &dev->regs->cfg); |
| |
| make_ep_lists(dev); |
| |
| dev->data_ep_enabled = 0; |
| dev->data_ep_queued = 0; |
| } |
| |
| /* Sets initial endpoint parameters */ |
| static void udc_setup_endpoints(struct udc *dev) |
| { |
| struct udc_ep *ep; |
| u32 tmp; |
| u32 reg; |
| |
| DBG(dev, "udc_setup_endpoints()\n"); |
| |
| /* read enum speed */ |
| tmp = readl(&dev->regs->sts); |
| tmp = AMD_GETBITS(tmp, UDC_DEVSTS_ENUM_SPEED); |
| if (tmp == UDC_DEVSTS_ENUM_SPEED_HIGH) |
| dev->gadget.speed = USB_SPEED_HIGH; |
| else if (tmp == UDC_DEVSTS_ENUM_SPEED_FULL) |
| dev->gadget.speed = USB_SPEED_FULL; |
| |
| /* set basic ep parameters */ |
| for (tmp = 0; tmp < UDC_EP_NUM; tmp++) { |
| ep = &dev->ep[tmp]; |
| ep->dev = dev; |
| ep->ep.name = ep_string[tmp]; |
| ep->num = tmp; |
| /* txfifo size is calculated at enable time */ |
| ep->txfifo = dev->txfifo; |
| |
| /* fifo size */ |
| if (tmp < UDC_EPIN_NUM) { |
| ep->fifo_depth = UDC_TXFIFO_SIZE; |
| ep->in = 1; |
| } else { |
| ep->fifo_depth = UDC_RXFIFO_SIZE; |
| ep->in = 0; |
| |
| } |
| ep->regs = &dev->ep_regs[tmp]; |
| /* |
| * ep will be reset only if ep was not enabled before to avoid |
| * disabling ep interrupts when ENUM interrupt occurs but ep is |
| * not enabled by gadget driver |
| */ |
| if (!ep->ep.desc) |
| ep_init(dev->regs, ep); |
| |
| if (use_dma) { |
| /* |
| * ep->dma is not really used, just to indicate that |
| * DMA is active: remove this |
| * dma regs = dev control regs |
| */ |
| ep->dma = &dev->regs->ctl; |
| |
| /* nak OUT endpoints until enable - not for ep0 */ |
| if (tmp != UDC_EP0IN_IX && tmp != UDC_EP0OUT_IX |
| && tmp > UDC_EPIN_NUM) { |
| /* set NAK */ |
| reg = readl(&dev->ep[tmp].regs->ctl); |
| reg |= AMD_BIT(UDC_EPCTL_SNAK); |
| writel(reg, &dev->ep[tmp].regs->ctl); |
| dev->ep[tmp].naking = 1; |
| |
| } |
| } |
| } |
| /* EP0 max packet */ |
| if (dev->gadget.speed == USB_SPEED_FULL) { |
| usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0IN_IX].ep, |
| UDC_FS_EP0IN_MAX_PKT_SIZE); |
| usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0OUT_IX].ep, |
| UDC_FS_EP0OUT_MAX_PKT_SIZE); |
| } else if (dev->gadget.speed == USB_SPEED_HIGH) { |
| usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0IN_IX].ep, |
| UDC_EP0IN_MAX_PKT_SIZE); |
| usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0OUT_IX].ep, |
| UDC_EP0OUT_MAX_PKT_SIZE); |
| } |
| |
| /* |
| * with suspend bug workaround, ep0 params for gadget driver |
| * are set at gadget driver bind() call |
| */ |
| dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep; |
| dev->ep[UDC_EP0IN_IX].halted = 0; |
| INIT_LIST_HEAD(&dev->gadget.ep0->ep_list); |
| |
| /* init cfg/alt/int */ |
| dev->cur_config = 0; |
| dev->cur_intf = 0; |
| dev->cur_alt = 0; |
| } |
| |
| /* Bringup after Connect event, initial bringup to be ready for ep0 events */ |
| static void usb_connect(struct udc *dev) |
| { |
| |
| dev_info(&dev->pdev->dev, "USB Connect\n"); |
| |
| dev->connected = 1; |
| |
| /* put into initial config */ |
| udc_basic_init(dev); |
| |
| /* enable device setup interrupts */ |
| udc_enable_dev_setup_interrupts(dev); |
| } |
| |
| /* |
| * Calls gadget with disconnect event and resets the UDC and makes |
| * initial bringup to be ready for ep0 events |
| */ |
| static void usb_disconnect(struct udc *dev) |
| { |
| |
| dev_info(&dev->pdev->dev, "USB Disconnect\n"); |
| |
| dev->connected = 0; |
| |
| /* mask interrupts */ |
| udc_mask_unused_interrupts(dev); |
| |
| /* REVISIT there doesn't seem to be a point to having this |
| * talk to a tasklet ... do it directly, we already hold |
| * the spinlock needed to process the disconnect. |
| */ |
| |
| tasklet_schedule(&disconnect_tasklet); |
| } |
| |
| /* Tasklet for disconnect to be outside of interrupt context */ |
| static void udc_tasklet_disconnect(unsigned long par) |
| { |
| struct udc *dev = (struct udc *)(*((struct udc **) par)); |
| u32 tmp; |
| |
| DBG(dev, "Tasklet disconnect\n"); |
| spin_lock_irq(&dev->lock); |
| |
| if (dev->driver) { |
| spin_unlock(&dev->lock); |
| dev->driver->disconnect(&dev->gadget); |
| spin_lock(&dev->lock); |
| |
| /* empty queues */ |
| for (tmp = 0; tmp < UDC_EP_NUM; tmp++) |
| empty_req_queue(&dev->ep[tmp]); |
| |
| } |
| |
| /* disable ep0 */ |
| ep_init(dev->regs, |
| &dev->ep[UDC_EP0IN_IX]); |
| |
| |
| if (!soft_reset_occured) { |
| /* init controller by soft reset */ |
| udc_soft_reset(dev); |
| soft_reset_occured++; |
| } |
| |
| /* re-enable dev interrupts */ |
| udc_enable_dev_setup_interrupts(dev); |
| /* back to full speed ? */ |
| if (use_fullspeed) { |
| tmp = readl(&dev->regs->cfg); |
| tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD); |
| writel(tmp, &dev->regs->cfg); |
| } |
| |
| spin_unlock_irq(&dev->lock); |
| } |
| |
| /* Reset the UDC core */ |
| static void udc_soft_reset(struct udc *dev) |
| { |
| unsigned long flags; |
| |
| DBG(dev, "Soft reset\n"); |
| /* |
| * reset possible waiting interrupts, because int. |
| * status is lost after soft reset, |
| * ep int. status reset |
| */ |
| writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqsts); |
| /* device int. status reset */ |
| writel(UDC_DEV_MSK_DISABLE, &dev->regs->irqsts); |
| |
| spin_lock_irqsave(&udc_irq_spinlock, flags); |
| writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg); |
| readl(&dev->regs->cfg); |
| spin_unlock_irqrestore(&udc_irq_spinlock, flags); |
| |
| } |
| |
| /* RDE timer callback to set RDE bit */ |
| static void udc_timer_function(unsigned long v) |
| { |
| u32 tmp; |
| |
| spin_lock_irq(&udc_irq_spinlock); |
| |
| if (set_rde > 0) { |
| /* |
| * open the fifo if fifo was filled on last timer call |
| * conditionally |
| */ |
| if (set_rde > 1) { |
| /* set RDE to receive setup data */ |
| tmp = readl(&udc->regs->ctl); |
| tmp |= AMD_BIT(UDC_DEVCTL_RDE); |
| writel(tmp, &udc->regs->ctl); |
| set_rde = -1; |
| } else if (readl(&udc->regs->sts) |
| & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) { |
| /* |
| * if fifo empty setup polling, do not just |
| * open the fifo |
| */ |
| udc_timer.expires = jiffies + HZ/UDC_RDE_TIMER_DIV; |
| if (!stop_timer) |
| add_timer(&udc_timer); |
| } else { |
| /* |
| * fifo contains data now, setup timer for opening |
| * the fifo when timer expires to be able to receive |
| * setup packets, when data packets gets queued by |
| * gadget layer then timer will forced to expire with |
| * set_rde=0 (RDE is set in udc_queue()) |
| */ |
| set_rde++; |
| /* debug: lhadmot_timer_start = 221070 */ |
| udc_timer.expires = jiffies + HZ*UDC_RDE_TIMER_SECONDS; |
| if (!stop_timer) |
| add_timer(&udc_timer); |
| } |
| |
| } else |
| set_rde = -1; /* RDE was set by udc_queue() */ |
| spin_unlock_irq(&udc_irq_spinlock); |
| if (stop_timer) |
| complete(&on_exit); |
| |
| } |
| |
| /* Handle halt state, used in stall poll timer */ |
| static void udc_handle_halt_state(struct udc_ep *ep) |
| { |
| u32 tmp; |
| /* set stall as long not halted */ |
| if (ep->halted == 1) { |
| tmp = readl(&ep->regs->ctl); |
| /* STALL cleared ? */ |
| if (!(tmp & AMD_BIT(UDC_EPCTL_S))) { |
| /* |
| * FIXME: MSC spec requires that stall remains |
| * even on receivng of CLEAR_FEATURE HALT. So |
| * we would set STALL again here to be compliant. |
| * But with current mass storage drivers this does |
| * not work (would produce endless host retries). |
| * So we clear halt on CLEAR_FEATURE. |
| * |
| DBG(ep->dev, "ep %d: set STALL again\n", ep->num); |
| tmp |= AMD_BIT(UDC_EPCTL_S); |
| writel(tmp, &ep->regs->ctl);*/ |
| |
| /* clear NAK by writing CNAK */ |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &ep->regs->ctl); |
| ep->halted = 0; |
| UDC_QUEUE_CNAK(ep, ep->num); |
| } |
| } |
| } |
| |
| /* Stall timer callback to poll S bit and set it again after */ |
| static void udc_pollstall_timer_function(unsigned long v) |
| { |
| struct udc_ep *ep; |
| int halted = 0; |
| |
| spin_lock_irq(&udc_stall_spinlock); |
| /* |
| * only one IN and OUT endpoints are handled |
| * IN poll stall |
| */ |
| ep = &udc->ep[UDC_EPIN_IX]; |
| udc_handle_halt_state(ep); |
| if (ep->halted) |
| halted = 1; |
| /* OUT poll stall */ |
| ep = &udc->ep[UDC_EPOUT_IX]; |
| udc_handle_halt_state(ep); |
| if (ep->halted) |
| halted = 1; |
| |
| /* setup timer again when still halted */ |
| if (!stop_pollstall_timer && halted) { |
| udc_pollstall_timer.expires = jiffies + |
| HZ * UDC_POLLSTALL_TIMER_USECONDS |
| / (1000 * 1000); |
| add_timer(&udc_pollstall_timer); |
| } |
| spin_unlock_irq(&udc_stall_spinlock); |
| |
| if (stop_pollstall_timer) |
| complete(&on_pollstall_exit); |
| } |
| |
| /* Inits endpoint 0 so that SETUP packets are processed */ |
| static void activate_control_endpoints(struct udc *dev) |
| { |
| u32 tmp; |
| |
| DBG(dev, "activate_control_endpoints\n"); |
| |
| /* flush fifo */ |
| tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_F); |
| writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl); |
| |
| /* set ep0 directions */ |
| dev->ep[UDC_EP0IN_IX].in = 1; |
| dev->ep[UDC_EP0OUT_IX].in = 0; |
| |
| /* set buffer size (tx fifo entries) of EP0_IN */ |
| tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufin_framenum); |
| if (dev->gadget.speed == USB_SPEED_FULL) |
| tmp = AMD_ADDBITS(tmp, UDC_FS_EPIN0_BUFF_SIZE, |
| UDC_EPIN_BUFF_SIZE); |
| else if (dev->gadget.speed == USB_SPEED_HIGH) |
| tmp = AMD_ADDBITS(tmp, UDC_EPIN0_BUFF_SIZE, |
| UDC_EPIN_BUFF_SIZE); |
| writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufin_framenum); |
| |
| /* set max packet size of EP0_IN */ |
| tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt); |
| if (dev->gadget.speed == USB_SPEED_FULL) |
| tmp = AMD_ADDBITS(tmp, UDC_FS_EP0IN_MAX_PKT_SIZE, |
| UDC_EP_MAX_PKT_SIZE); |
| else if (dev->gadget.speed == USB_SPEED_HIGH) |
| tmp = AMD_ADDBITS(tmp, UDC_EP0IN_MAX_PKT_SIZE, |
| UDC_EP_MAX_PKT_SIZE); |
| writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt); |
| |
| /* set max packet size of EP0_OUT */ |
| tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt); |
| if (dev->gadget.speed == USB_SPEED_FULL) |
| tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE, |
| UDC_EP_MAX_PKT_SIZE); |
| else if (dev->gadget.speed == USB_SPEED_HIGH) |
| tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE, |
| UDC_EP_MAX_PKT_SIZE); |
| writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt); |
| |
| /* set max packet size of EP0 in UDC CSR */ |
| tmp = readl(&dev->csr->ne[0]); |
| if (dev->gadget.speed == USB_SPEED_FULL) |
| tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE, |
| UDC_CSR_NE_MAX_PKT); |
| else if (dev->gadget.speed == USB_SPEED_HIGH) |
| tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE, |
| UDC_CSR_NE_MAX_PKT); |
| writel(tmp, &dev->csr->ne[0]); |
| |
| if (use_dma) { |
| dev->ep[UDC_EP0OUT_IX].td->status |= |
| AMD_BIT(UDC_DMA_OUT_STS_L); |
| /* write dma desc address */ |
| writel(dev->ep[UDC_EP0OUT_IX].td_stp_dma, |
| &dev->ep[UDC_EP0OUT_IX].regs->subptr); |
| writel(dev->ep[UDC_EP0OUT_IX].td_phys, |
| &dev->ep[UDC_EP0OUT_IX].regs->desptr); |
| /* stop RDE timer */ |
| if (timer_pending(&udc_timer)) { |
| set_rde = 0; |
| mod_timer(&udc_timer, jiffies - 1); |
| } |
| /* stop pollstall timer */ |
| if (timer_pending(&udc_pollstall_timer)) |
| mod_timer(&udc_pollstall_timer, jiffies - 1); |
| /* enable DMA */ |
| tmp = readl(&dev->regs->ctl); |
| tmp |= AMD_BIT(UDC_DEVCTL_MODE) |
| | AMD_BIT(UDC_DEVCTL_RDE) |
| | AMD_BIT(UDC_DEVCTL_TDE); |
| if (use_dma_bufferfill_mode) |
| tmp |= AMD_BIT(UDC_DEVCTL_BF); |
| else if (use_dma_ppb_du) |
| tmp |= AMD_BIT(UDC_DEVCTL_DU); |
| writel(tmp, &dev->regs->ctl); |
| } |
| |
| /* clear NAK by writing CNAK for EP0IN */ |
| tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl); |
| dev->ep[UDC_EP0IN_IX].naking = 0; |
| UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX); |
| |
| /* clear NAK by writing CNAK for EP0OUT */ |
| tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl); |
| dev->ep[UDC_EP0OUT_IX].naking = 0; |
| UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX); |
| } |
| |
| /* Make endpoint 0 ready for control traffic */ |
| static int setup_ep0(struct udc *dev) |
| { |
| activate_control_endpoints(dev); |
| /* enable ep0 interrupts */ |
| udc_enable_ep0_interrupts(dev); |
| /* enable device setup interrupts */ |
| udc_enable_dev_setup_interrupts(dev); |
| |
| return 0; |
| } |
| |
| /* Called by gadget driver to register itself */ |
| static int amd5536_udc_start(struct usb_gadget *g, |
| struct usb_gadget_driver *driver) |
| { |
| struct udc *dev = to_amd5536_udc(g); |
| u32 tmp; |
| |
| driver->driver.bus = NULL; |
| dev->driver = driver; |
| |
| /* Some gadget drivers use both ep0 directions. |
| * NOTE: to gadget driver, ep0 is just one endpoint... |
| */ |
| dev->ep[UDC_EP0OUT_IX].ep.driver_data = |
| dev->ep[UDC_EP0IN_IX].ep.driver_data; |
| |
| /* get ready for ep0 traffic */ |
| setup_ep0(dev); |
| |
| /* clear SD */ |
| tmp = readl(&dev->regs->ctl); |
| tmp = tmp & AMD_CLEAR_BIT(UDC_DEVCTL_SD); |
| writel(tmp, &dev->regs->ctl); |
| |
| usb_connect(dev); |
| |
| return 0; |
| } |
| |
| /* shutdown requests and disconnect from gadget */ |
| static void |
| shutdown(struct udc *dev, struct usb_gadget_driver *driver) |
| __releases(dev->lock) |
| __acquires(dev->lock) |
| { |
| int tmp; |
| |
| /* empty queues and init hardware */ |
| udc_basic_init(dev); |
| |
| for (tmp = 0; tmp < UDC_EP_NUM; tmp++) |
| empty_req_queue(&dev->ep[tmp]); |
| |
| udc_setup_endpoints(dev); |
| } |
| |
| /* Called by gadget driver to unregister itself */ |
| static int amd5536_udc_stop(struct usb_gadget *g, |
| struct usb_gadget_driver *driver) |
| { |
| struct udc *dev = to_amd5536_udc(g); |
| unsigned long flags; |
| u32 tmp; |
| |
| spin_lock_irqsave(&dev->lock, flags); |
| udc_mask_unused_interrupts(dev); |
| shutdown(dev, driver); |
| spin_unlock_irqrestore(&dev->lock, flags); |
| |
| dev->driver = NULL; |
| |
| /* set SD */ |
| tmp = readl(&dev->regs->ctl); |
| tmp |= AMD_BIT(UDC_DEVCTL_SD); |
| writel(tmp, &dev->regs->ctl); |
| |
| return 0; |
| } |
| |
| /* Clear pending NAK bits */ |
| static void udc_process_cnak_queue(struct udc *dev) |
| { |
| u32 tmp; |
| u32 reg; |
| |
| /* check epin's */ |
| DBG(dev, "CNAK pending queue processing\n"); |
| for (tmp = 0; tmp < UDC_EPIN_NUM_USED; tmp++) { |
| if (cnak_pending & (1 << tmp)) { |
| DBG(dev, "CNAK pending for ep%d\n", tmp); |
| /* clear NAK by writing CNAK */ |
| reg = readl(&dev->ep[tmp].regs->ctl); |
| reg |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(reg, &dev->ep[tmp].regs->ctl); |
| dev->ep[tmp].naking = 0; |
| UDC_QUEUE_CNAK(&dev->ep[tmp], dev->ep[tmp].num); |
| } |
| } |
| /* ... and ep0out */ |
| if (cnak_pending & (1 << UDC_EP0OUT_IX)) { |
| DBG(dev, "CNAK pending for ep%d\n", UDC_EP0OUT_IX); |
| /* clear NAK by writing CNAK */ |
| reg = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl); |
| reg |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(reg, &dev->ep[UDC_EP0OUT_IX].regs->ctl); |
| dev->ep[UDC_EP0OUT_IX].naking = 0; |
| UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], |
| dev->ep[UDC_EP0OUT_IX].num); |
| } |
| } |
| |
| /* Enabling RX DMA after setup packet */ |
| static void udc_ep0_set_rde(struct udc *dev) |
| { |
| if (use_dma) { |
| /* |
| * only enable RXDMA when no data endpoint enabled |
| * or data is queued |
| */ |
| if (!dev->data_ep_enabled || dev->data_ep_queued) { |
| udc_set_rde(dev); |
| } else { |
| /* |
| * setup timer for enabling RDE (to not enable |
| * RXFIFO DMA for data endpoints to early) |
| */ |
| if (set_rde != 0 && !timer_pending(&udc_timer)) { |
| udc_timer.expires = |
| jiffies + HZ/UDC_RDE_TIMER_DIV; |
| set_rde = 1; |
| if (!stop_timer) |
| add_timer(&udc_timer); |
| } |
| } |
| } |
| } |
| |
| |
| /* Interrupt handler for data OUT traffic */ |
| static irqreturn_t udc_data_out_isr(struct udc *dev, int ep_ix) |
| { |
| irqreturn_t ret_val = IRQ_NONE; |
| u32 tmp; |
| struct udc_ep *ep; |
| struct udc_request *req; |
| unsigned int count; |
| struct udc_data_dma *td = NULL; |
| unsigned dma_done; |
| |
| VDBG(dev, "ep%d irq\n", ep_ix); |
| ep = &dev->ep[ep_ix]; |
| |
| tmp = readl(&ep->regs->sts); |
| if (use_dma) { |
| /* BNA event ? */ |
| if (tmp & AMD_BIT(UDC_EPSTS_BNA)) { |
| DBG(dev, "BNA ep%dout occurred - DESPTR = %x\n", |
| ep->num, readl(&ep->regs->desptr)); |
| /* clear BNA */ |
| writel(tmp | AMD_BIT(UDC_EPSTS_BNA), &ep->regs->sts); |
| if (!ep->cancel_transfer) |
| ep->bna_occurred = 1; |
| else |
| ep->cancel_transfer = 0; |
| ret_val = IRQ_HANDLED; |
| goto finished; |
| } |
| } |
| /* HE event ? */ |
| if (tmp & AMD_BIT(UDC_EPSTS_HE)) { |
| dev_err(&dev->pdev->dev, "HE ep%dout occurred\n", ep->num); |
| |
| /* clear HE */ |
| writel(tmp | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts); |
| ret_val = IRQ_HANDLED; |
| goto finished; |
| } |
| |
| if (!list_empty(&ep->queue)) { |
| |
| /* next request */ |
| req = list_entry(ep->queue.next, |
| struct udc_request, queue); |
| } else { |
| req = NULL; |
| udc_rxfifo_pending = 1; |
| } |
| VDBG(dev, "req = %p\n", req); |
| /* fifo mode */ |
| if (!use_dma) { |
| |
| /* read fifo */ |
| if (req && udc_rxfifo_read(ep, req)) { |
| ret_val = IRQ_HANDLED; |
| |
| /* finish */ |
| complete_req(ep, req, 0); |
| /* next request */ |
| if (!list_empty(&ep->queue) && !ep->halted) { |
| req = list_entry(ep->queue.next, |
| struct udc_request, queue); |
| } else |
| req = NULL; |
| } |
| |
| /* DMA */ |
| } else if (!ep->cancel_transfer && req != NULL) { |
| ret_val = IRQ_HANDLED; |
| |
| /* check for DMA done */ |
| if (!use_dma_ppb) { |
| dma_done = AMD_GETBITS(req->td_data->status, |
| UDC_DMA_OUT_STS_BS); |
| /* packet per buffer mode - rx bytes */ |
| } else { |
| /* |
| * if BNA occurred then recover desc. from |
| * BNA dummy desc. |
| */ |
| if (ep->bna_occurred) { |
| VDBG(dev, "Recover desc. from BNA dummy\n"); |
| memcpy(req->td_data, ep->bna_dummy_req->td_data, |
| sizeof(struct udc_data_dma)); |
| ep->bna_occurred = 0; |
| udc_init_bna_dummy(ep->req); |
| } |
| td = udc_get_last_dma_desc(req); |
| dma_done = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_BS); |
| } |
| if (dma_done == UDC_DMA_OUT_STS_BS_DMA_DONE) { |
| /* buffer fill mode - rx bytes */ |
| if (!use_dma_ppb) { |
| /* received number bytes */ |
| count = AMD_GETBITS(req->td_data->status, |
| UDC_DMA_OUT_STS_RXBYTES); |
| VDBG(dev, "rx bytes=%u\n", count); |
| /* packet per buffer mode - rx bytes */ |
| } else { |
| VDBG(dev, "req->td_data=%p\n", req->td_data); |
| VDBG(dev, "last desc = %p\n", td); |
| /* received number bytes */ |
| if (use_dma_ppb_du) { |
| /* every desc. counts bytes */ |
| count = udc_get_ppbdu_rxbytes(req); |
| } else { |
| /* last desc. counts bytes */ |
| count = AMD_GETBITS(td->status, |
| UDC_DMA_OUT_STS_RXBYTES); |
| if (!count && req->req.length |
| == UDC_DMA_MAXPACKET) { |
| /* |
| * on 64k packets the RXBYTES |
| * field is zero |
| */ |
| count = UDC_DMA_MAXPACKET; |
| } |
| } |
| VDBG(dev, "last desc rx bytes=%u\n", count); |
| } |
| |
| tmp = req->req.length - req->req.actual; |
| if (count > tmp) { |
| if ((tmp % ep->ep.maxpacket) != 0) { |
| DBG(dev, "%s: rx %db, space=%db\n", |
| ep->ep.name, count, tmp); |
| req->req.status = -EOVERFLOW; |
| } |
| count = tmp; |
| } |
| req->req.actual += count; |
| req->dma_going = 0; |
| /* complete request */ |
| complete_req(ep, req, 0); |
| |
| /* next request */ |
| if (!list_empty(&ep->queue) && !ep->halted) { |
| req = list_entry(ep->queue.next, |
| struct udc_request, |
| queue); |
| /* |
| * DMA may be already started by udc_queue() |
| * called by gadget drivers completion |
| * routine. This happens when queue |
| * holds one request only. |
| */ |
| if (req->dma_going == 0) { |
| /* next dma */ |
| if (prep_dma(ep, req, GFP_ATOMIC) != 0) |
| goto finished; |
| /* write desc pointer */ |
| writel(req->td_phys, |
| &ep->regs->desptr); |
| req->dma_going = 1; |
| /* enable DMA */ |
| udc_set_rde(dev); |
| } |
| } else { |
| /* |
| * implant BNA dummy descriptor to allow |
| * RXFIFO opening by RDE |
| */ |
| if (ep->bna_dummy_req) { |
| /* write desc pointer */ |
| writel(ep->bna_dummy_req->td_phys, |
| &ep->regs->desptr); |
| ep->bna_occurred = 0; |
| } |
| |
| /* |
| * schedule timer for setting RDE if queue |
| * remains empty to allow ep0 packets pass |
| * through |
| */ |
| if (set_rde != 0 |
| && !timer_pending(&udc_timer)) { |
| udc_timer.expires = |
| jiffies |
| + HZ*UDC_RDE_TIMER_SECONDS; |
| set_rde = 1; |
| if (!stop_timer) |
| add_timer(&udc_timer); |
| } |
| if (ep->num != UDC_EP0OUT_IX) |
| dev->data_ep_queued = 0; |
| } |
| |
| } else { |
| /* |
| * RX DMA must be reenabled for each desc in PPBDU mode |
| * and must be enabled for PPBNDU mode in case of BNA |
| */ |
| udc_set_rde(dev); |
| } |
| |
| } else if (ep->cancel_transfer) { |
| ret_val = IRQ_HANDLED; |
| ep->cancel_transfer = 0; |
| } |
| |
| /* check pending CNAKS */ |
| if (cnak_pending) { |
| /* CNAk processing when rxfifo empty only */ |
| if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) |
| udc_process_cnak_queue(dev); |
| } |
| |
| /* clear OUT bits in ep status */ |
| writel(UDC_EPSTS_OUT_CLEAR, &ep->regs->sts); |
| finished: |
| return ret_val; |
| } |
| |
| /* Interrupt handler for data IN traffic */ |
| static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix) |
| { |
| irqreturn_t ret_val = IRQ_NONE; |
| u32 tmp; |
| u32 epsts; |
| struct udc_ep *ep; |
| struct udc_request *req; |
| struct udc_data_dma *td; |
| unsigned dma_done; |
| unsigned len; |
| |
| ep = &dev->ep[ep_ix]; |
| |
| epsts = readl(&ep->regs->sts); |
| if (use_dma) { |
| /* BNA ? */ |
| if (epsts & AMD_BIT(UDC_EPSTS_BNA)) { |
| dev_err(&dev->pdev->dev, |
| "BNA ep%din occurred - DESPTR = %08lx\n", |
| ep->num, |
| (unsigned long) readl(&ep->regs->desptr)); |
| |
| /* clear BNA */ |
| writel(epsts, &ep->regs->sts); |
| ret_val = IRQ_HANDLED; |
| goto finished; |
| } |
| } |
| /* HE event ? */ |
| if (epsts & AMD_BIT(UDC_EPSTS_HE)) { |
| dev_err(&dev->pdev->dev, |
| "HE ep%dn occurred - DESPTR = %08lx\n", |
| ep->num, (unsigned long) readl(&ep->regs->desptr)); |
| |
| /* clear HE */ |
| writel(epsts | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts); |
| ret_val = IRQ_HANDLED; |
| goto finished; |
| } |
| |
| /* DMA completion */ |
| if (epsts & AMD_BIT(UDC_EPSTS_TDC)) { |
| VDBG(dev, "TDC set- completion\n"); |
| ret_val = IRQ_HANDLED; |
| if (!ep->cancel_transfer && !list_empty(&ep->queue)) { |
| req = list_entry(ep->queue.next, |
| struct udc_request, queue); |
| /* |
| * length bytes transferred |
| * check dma done of last desc. in PPBDU mode |
| */ |
| if (use_dma_ppb_du) { |
| td = udc_get_last_dma_desc(req); |
| if (td) { |
| dma_done = |
| AMD_GETBITS(td->status, |
| UDC_DMA_IN_STS_BS); |
| /* don't care DMA done */ |
| req->req.actual = req->req.length; |
| } |
| } else { |
| /* assume all bytes transferred */ |
| req->req.actual = req->req.length; |
| } |
| |
| if (req->req.actual == req->req.length) { |
| /* complete req */ |
| complete_req(ep, req, 0); |
| req->dma_going = 0; |
| /* further request available ? */ |
| if (list_empty(&ep->queue)) { |
| /* disable interrupt */ |
| tmp = readl(&dev->regs->ep_irqmsk); |
| tmp |= AMD_BIT(ep->num); |
| writel(tmp, &dev->regs->ep_irqmsk); |
| } |
| } |
| } |
| ep->cancel_transfer = 0; |
| |
| } |
| /* |
| * status reg has IN bit set and TDC not set (if TDC was handled, |
| * IN must not be handled (UDC defect) ? |
| */ |
| if ((epsts & AMD_BIT(UDC_EPSTS_IN)) |
| && !(epsts & AMD_BIT(UDC_EPSTS_TDC))) { |
| ret_val = IRQ_HANDLED; |
| if (!list_empty(&ep->queue)) { |
| /* next request */ |
| req = list_entry(ep->queue.next, |
| struct udc_request, queue); |
| /* FIFO mode */ |
| if (!use_dma) { |
| /* write fifo */ |
| udc_txfifo_write(ep, &req->req); |
| len = req->req.length - req->req.actual; |
| if (len > ep->ep.maxpacket) |
| len = ep->ep.maxpacket; |
| req->req.actual += len; |
| if (req->req.actual == req->req.length |
| || (len != ep->ep.maxpacket)) { |
| /* complete req */ |
| complete_req(ep, req, 0); |
| } |
| /* DMA */ |
| } else if (req && !req->dma_going) { |
| VDBG(dev, "IN DMA : req=%p req->td_data=%p\n", |
| req, req->td_data); |
| if (req->td_data) { |
| |
| req->dma_going = 1; |
| |
| /* |
| * unset L bit of first desc. |
| * for chain |
| */ |
| if (use_dma_ppb && req->req.length > |
| ep->ep.maxpacket) { |
| req->td_data->status &= |
| AMD_CLEAR_BIT( |
| UDC_DMA_IN_STS_L); |
| } |
| |
| /* write desc pointer */ |
| writel(req->td_phys, &ep->regs->desptr); |
| |
| /* set HOST READY */ |
| req->td_data->status = |
| AMD_ADDBITS( |
| req->td_data->status, |
| UDC_DMA_IN_STS_BS_HOST_READY, |
| UDC_DMA_IN_STS_BS); |
| |
| /* set poll demand bit */ |
| tmp = readl(&ep->regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_P); |
| writel(tmp, &ep->regs->ctl); |
| } |
| } |
| |
| } else if (!use_dma && ep->in) { |
| /* disable interrupt */ |
| tmp = readl( |
| &dev->regs->ep_irqmsk); |
| tmp |= AMD_BIT(ep->num); |
| writel(tmp, |
| &dev->regs->ep_irqmsk); |
| } |
| } |
| /* clear status bits */ |
| writel(epsts, &ep->regs->sts); |
| |
| finished: |
| return ret_val; |
| |
| } |
| |
| /* Interrupt handler for Control OUT traffic */ |
| static irqreturn_t udc_control_out_isr(struct udc *dev) |
| __releases(dev->lock) |
| __acquires(dev->lock) |
| { |
| irqreturn_t ret_val = IRQ_NONE; |
| u32 tmp; |
| int setup_supported; |
| u32 count; |
| int set = 0; |
| struct udc_ep *ep; |
| struct udc_ep *ep_tmp; |
| |
| ep = &dev->ep[UDC_EP0OUT_IX]; |
| |
| /* clear irq */ |
| writel(AMD_BIT(UDC_EPINT_OUT_EP0), &dev->regs->ep_irqsts); |
| |
| tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts); |
| /* check BNA and clear if set */ |
| if (tmp & AMD_BIT(UDC_EPSTS_BNA)) { |
| VDBG(dev, "ep0: BNA set\n"); |
| writel(AMD_BIT(UDC_EPSTS_BNA), |
| &dev->ep[UDC_EP0OUT_IX].regs->sts); |
| ep->bna_occurred = 1; |
| ret_val = IRQ_HANDLED; |
| goto finished; |
| } |
| |
| /* type of data: SETUP or DATA 0 bytes */ |
| tmp = AMD_GETBITS(tmp, UDC_EPSTS_OUT); |
| VDBG(dev, "data_typ = %x\n", tmp); |
| |
| /* setup data */ |
| if (tmp == UDC_EPSTS_OUT_SETUP) { |
| ret_val = IRQ_HANDLED; |
| |
| ep->dev->stall_ep0in = 0; |
| dev->waiting_zlp_ack_ep0in = 0; |
| |
| /* set NAK for EP0_IN */ |
| tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_SNAK); |
| writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl); |
| dev->ep[UDC_EP0IN_IX].naking = 1; |
| /* get setup data */ |
| if (use_dma) { |
| |
| /* clear OUT bits in ep status */ |
| writel(UDC_EPSTS_OUT_CLEAR, |
| &dev->ep[UDC_EP0OUT_IX].regs->sts); |
| |
| setup_data.data[0] = |
| dev->ep[UDC_EP0OUT_IX].td_stp->data12; |
| setup_data.data[1] = |
| dev->ep[UDC_EP0OUT_IX].td_stp->data34; |
| /* set HOST READY */ |
| dev->ep[UDC_EP0OUT_IX].td_stp->status = |
| UDC_DMA_STP_STS_BS_HOST_READY; |
| } else { |
| /* read fifo */ |
| udc_rxfifo_read_dwords(dev, setup_data.data, 2); |
| } |
| |
| /* determine direction of control data */ |
| if ((setup_data.request.bRequestType & USB_DIR_IN) != 0) { |
| dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep; |
| /* enable RDE */ |
| udc_ep0_set_rde(dev); |
| set = 0; |
| } else { |
| dev->gadget.ep0 = &dev->ep[UDC_EP0OUT_IX].ep; |
| /* |
| * implant BNA dummy descriptor to allow RXFIFO opening |
| * by RDE |
| */ |
| if (ep->bna_dummy_req) { |
| /* write desc pointer */ |
| writel(ep->bna_dummy_req->td_phys, |
| &dev->ep[UDC_EP0OUT_IX].regs->desptr); |
| ep->bna_occurred = 0; |
| } |
| |
| set = 1; |
| dev->ep[UDC_EP0OUT_IX].naking = 1; |
| /* |
| * setup timer for enabling RDE (to not enable |
| * RXFIFO DMA for data to early) |
| */ |
| set_rde = 1; |
| if (!timer_pending(&udc_timer)) { |
| udc_timer.expires = jiffies + |
| HZ/UDC_RDE_TIMER_DIV; |
| if (!stop_timer) |
| add_timer(&udc_timer); |
| } |
| } |
| |
| /* |
| * mass storage reset must be processed here because |
| * next packet may be a CLEAR_FEATURE HALT which would not |
| * clear the stall bit when no STALL handshake was received |
| * before (autostall can cause this) |
| */ |
| if (setup_data.data[0] == UDC_MSCRES_DWORD0 |
| && setup_data.data[1] == UDC_MSCRES_DWORD1) { |
| DBG(dev, "MSC Reset\n"); |
| /* |
| * clear stall bits |
| * only one IN and OUT endpoints are handled |
| */ |
| ep_tmp = &udc->ep[UDC_EPIN_IX]; |
| udc_set_halt(&ep_tmp->ep, 0); |
| ep_tmp = &udc->ep[UDC_EPOUT_IX]; |
| udc_set_halt(&ep_tmp->ep, 0); |
| } |
| |
| /* call gadget with setup data received */ |
| spin_unlock(&dev->lock); |
| setup_supported = dev->driver->setup(&dev->gadget, |
| &setup_data.request); |
| spin_lock(&dev->lock); |
| |
| tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl); |
| /* ep0 in returns data (not zlp) on IN phase */ |
| if (setup_supported >= 0 && setup_supported < |
| UDC_EP0IN_MAXPACKET) { |
| /* clear NAK by writing CNAK in EP0_IN */ |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl); |
| dev->ep[UDC_EP0IN_IX].naking = 0; |
| UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX); |
| |
| /* if unsupported request then stall */ |
| } else if (setup_supported < 0) { |
| tmp |= AMD_BIT(UDC_EPCTL_S); |
| writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl); |
| } else |
| dev->waiting_zlp_ack_ep0in = 1; |
| |
| |
| /* clear NAK by writing CNAK in EP0_OUT */ |
| if (!set) { |
| tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_CNAK); |
| writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl); |
| dev->ep[UDC_EP0OUT_IX].naking = 0; |
| UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX); |
| } |
| |
| if (!use_dma) { |
| /* clear OUT bits in ep status */ |
| writel(UDC_EPSTS_OUT_CLEAR, |
| &dev->ep[UDC_EP0OUT_IX].regs->sts); |
| } |
| |
| /* data packet 0 bytes */ |
| } else if (tmp == UDC_EPSTS_OUT_DATA) { |
| /* clear OUT bits in ep status */ |
| writel(UDC_EPSTS_OUT_CLEAR, &dev->ep[UDC_EP0OUT_IX].regs->sts); |
| |
| /* get setup data: only 0 packet */ |
| if (use_dma) { |
| /* no req if 0 packet, just reactivate */ |
| if (list_empty(&dev->ep[UDC_EP0OUT_IX].queue)) { |
| VDBG(dev, "ZLP\n"); |
| |
| /* set HOST READY */ |
| dev->ep[UDC_EP0OUT_IX].td->status = |
| AMD_ADDBITS( |
| dev->ep[UDC_EP0OUT_IX].td->status, |
| UDC_DMA_OUT_STS_BS_HOST_READY, |
| UDC_DMA_OUT_STS_BS); |
| /* enable RDE */ |
| udc_ep0_set_rde(dev); |
| ret_val = IRQ_HANDLED; |
| |
| } else { |
| /* control write */ |
| ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX); |
| /* re-program desc. pointer for possible ZLPs */ |
| writel(dev->ep[UDC_EP0OUT_IX].td_phys, |
| &dev->ep[UDC_EP0OUT_IX].regs->desptr); |
| /* enable RDE */ |
| udc_ep0_set_rde(dev); |
| } |
| } else { |
| |
| /* received number bytes */ |
| count = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts); |
| count = AMD_GETBITS(count, UDC_EPSTS_RX_PKT_SIZE); |
| /* out data for fifo mode not working */ |
| count = 0; |
| |
| /* 0 packet or real data ? */ |
| if (count != 0) { |
| ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX); |
| } else { |
| /* dummy read confirm */ |
| readl(&dev->ep[UDC_EP0OUT_IX].regs->confirm); |
| ret_val = IRQ_HANDLED; |
| } |
| } |
| } |
| |
| /* check pending CNAKS */ |
| if (cnak_pending) { |
| /* CNAk processing when rxfifo empty only */ |
| if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) |
| udc_process_cnak_queue(dev); |
| } |
| |
| finished: |
| return ret_val; |
| } |
| |
| /* Interrupt handler for Control IN traffic */ |
| static irqreturn_t udc_control_in_isr(struct udc *dev) |
| { |
| irqreturn_t ret_val = IRQ_NONE; |
| u32 tmp; |
| struct udc_ep *ep; |
| struct udc_request *req; |
| unsigned len; |
| |
| ep = &dev->ep[UDC_EP0IN_IX]; |
| |
| /* clear irq */ |
| writel(AMD_BIT(UDC_EPINT_IN_EP0), &dev->regs->ep_irqsts); |
| |
| tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->sts); |
| /* DMA completion */ |
| if (tmp & AMD_BIT(UDC_EPSTS_TDC)) { |
| VDBG(dev, "isr: TDC clear\n"); |
| ret_val = IRQ_HANDLED; |
| |
| /* clear TDC bit */ |
| writel(AMD_BIT(UDC_EPSTS_TDC), |
| &dev->ep[UDC_EP0IN_IX].regs->sts); |
| |
| /* status reg has IN bit set ? */ |
| } else if (tmp & AMD_BIT(UDC_EPSTS_IN)) { |
| ret_val = IRQ_HANDLED; |
| |
| if (ep->dma) { |
| /* clear IN bit */ |
| writel(AMD_BIT(UDC_EPSTS_IN), |
| &dev->ep[UDC_EP0IN_IX].regs->sts); |
| } |
| if (dev->stall_ep0in) { |
| DBG(dev, "stall ep0in\n"); |
| /* halt ep0in */ |
| tmp = readl(&ep->regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_S); |
| writel(tmp, &ep->regs->ctl); |
| } else { |
| if (!list_empty(&ep->queue)) { |
| /* next request */ |
| req = list_entry(ep->queue.next, |
| struct udc_request, queue); |
| |
| if (ep->dma) { |
| /* write desc pointer */ |
| writel(req->td_phys, &ep->regs->desptr); |
| /* set HOST READY */ |
| req->td_data->status = |
| AMD_ADDBITS( |
| req->td_data->status, |
| UDC_DMA_STP_STS_BS_HOST_READY, |
| UDC_DMA_STP_STS_BS); |
| |
| /* set poll demand bit */ |
| tmp = |
| readl(&dev->ep[UDC_EP0IN_IX].regs->ctl); |
| tmp |= AMD_BIT(UDC_EPCTL_P); |
| writel(tmp, |
| &dev->ep[UDC_EP0IN_IX].regs->ctl); |
| |
| /* all bytes will be transferred */ |
| req->req.actual = req->req.length; |
| |
| /* complete req */ |
| complete_req(ep, req, 0); |
| |
| } else { |
| /* write fifo */ |
| udc_txfifo_write(ep, &req->req); |
| |
| /* lengh bytes transferred */ |
| len = req->req.length - req->req.actual; |
| if (len > ep->ep.maxpacket) |
| len = ep->ep.maxpacket; |
| |
| req->req.actual += len; |
| if (req->req.actual == req->req.length |
| || (len != ep->ep.maxpacket)) { |
| /* complete req */ |
| complete_req(ep, req, 0); |
| } |
| } |
| |
| } |
| } |
| ep->halted = 0; |
| dev->stall_ep0in = 0; |
| if (!ep->dma) { |
| /* clear IN bit */ |
| writel(AMD_BIT(UDC_EPSTS_IN), |
| &dev->ep[UDC_EP0IN_IX].regs->sts); |
| } |
| } |
| |
| return ret_val; |
| } |
| |
| |
| /* Interrupt handler for global device events */ |
| static irqreturn_t udc_dev_isr(struct udc *dev, u32 dev_irq) |
| __releases(dev->lock) |
| __acquires(dev->lock) |
| { |
| irqreturn_t ret_val = IRQ_NONE; |
| u32 tmp; |
| u32 cfg; |
| struct udc_ep *ep; |
| u16 i; |
| u8 udc_csr_epix; |
| |
| /* SET_CONFIG irq ? */ |
| if (dev_irq & AMD_BIT(UDC_DEVINT_SC)) { |
| ret_val = IRQ_HANDLED; |
| |
| /* read config value */ |
| tmp = readl(&dev->regs->sts); |
| cfg = AMD_GETBITS(tmp, UDC_DEVSTS_CFG); |
| DBG(dev, "SET_CONFIG interrupt: config=%d\n", cfg); |
| dev->cur_config = cfg; |
| dev->set_cfg_not_acked = 1; |
| |
| /* make usb request for gadget driver */ |
| memset(&setup_data, 0 , sizeof(union udc_setup_data)); |
| setup_data.request.bRequest = USB_REQ_SET_CONFIGURATION; |
| setup_data.request.wValue = cpu_to_le16(dev->cur_config); |
| |
| /* programm the NE registers */ |
| for (i = 0; i < UDC_EP_NUM; i++) { |
| ep = &dev->ep[i]; |
| if (ep->in) { |
| |
| /* ep ix in UDC CSR register space */ |
| udc_csr_epix = ep->num; |
| |
| |
| /* OUT ep */ |
| } else { |
| /* ep ix in UDC CSR register space */ |
| udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS; |
| } |
| |
| tmp = readl(&dev->csr->ne[udc_csr_epix]); |
| /* ep cfg */ |
| tmp = AMD_ADDBITS(tmp, ep->dev->cur_config, |
| UDC_CSR_NE_CFG); |
| /* write reg */ |
| writel(tmp, &dev->csr->ne[udc_csr_epix]); |
| |
| /* clear stall bits */ |
| ep->halted = 0; |
| tmp = readl(&ep->regs->ctl); |
| tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S); |
| writel(tmp, &ep->regs->ctl); |
| } |
| /* call gadget zero with setup data received */ |
| spin_unlock(&dev->lock); |
| tmp = dev->driver->setup(&dev->gadget, &setup_data.request); |
| spin_lock(&dev->lock); |
| |
| } /* SET_INTERFACE ? */ |
| if (dev_irq & AMD_BIT(UDC_DEVINT_SI)) { |
| ret_val = IRQ_HANDLED; |
| |
| dev->set_cfg_not_acked = 1; |
| /* read interface and alt setting values */ |
| tmp = readl(&dev->regs->sts); |
| dev->cur_alt = AMD_GETBITS(tmp, UDC_DEVSTS_ALT); |
| dev->cur_intf = AMD_GETBITS(tmp, UDC_DEVSTS_INTF); |
| |
| /* make usb request for gadget driver */ |
| memset(&setup_data, 0 , sizeof(union udc_setup_data)); |
| setup_data.request.bRequest = USB_REQ_SET_INTERFACE; |
| setup_data.request.bRequestType = USB_RECIP_INTERFACE; |
| setup_data.request.wValue = cpu_to_le16(dev->cur_alt); |
| setup_data.request.wIndex = cpu_to_le16(dev->cur_intf); |
| |
| DBG(dev, "SET_INTERFACE interrupt: alt=%d intf=%d\n", |
| dev->cur_alt, dev->cur_intf); |
| |
| /* programm the NE registers */ |
| for (i = 0; i < UDC_EP_NUM; i++) { |
| ep = &dev->ep[i]; |
| if (ep->in) { |
| |
| /* ep ix in UDC CSR register space */ |
| udc_csr_epix = ep->num; |
| |
| |
| /* OUT ep */ |
| } else { |
| /* ep ix in UDC CSR register space */ |
| udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS; |
| } |
| |
| /* UDC CSR reg */ |
| /* set ep values */ |
| tmp = readl(&dev->csr->ne[udc_csr_epix]); |
| /* ep interface */ |
| tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf, |
| UDC_CSR_NE_INTF); |
| /* tmp = AMD_ADDBITS(tmp, 2, UDC_CSR_NE_INTF); */ |
| /* ep alt */ |
| tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt, |
| UDC_CSR_NE_ALT); |
| /* write reg */ |
| writel(tmp, &dev->csr->ne[udc_csr_epix]); |
| |
| /* clear stall bits */ |
| ep->halted = 0; |
| tmp = readl(&ep->regs->ctl); |
| tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S); |
| writel(tmp, &ep->regs->ctl); |
| } |
| |
| /* call gadget zero with setup data received */ |
| spin_unlock(&dev->lock); |
| tmp = dev->driver->setup(&dev->gadget, &setup_data.request); |
| spin_lock(&dev->lock); |
| |
| } /* USB reset */ |
| if (dev_irq & AMD_BIT(UDC_DEVINT_UR)) { |
| DBG(dev, "USB Reset interrupt\n"); |
| ret_val = IRQ_HANDLED; |
| |
| /* allow soft reset when suspend occurs */ |
| soft_reset_occured = 0; |
| |
| dev->waiting_zlp_ack_ep0in = 0; |
| dev->set_cfg_not_acked = 0; |
| |
| /* mask not needed interrupts */ |
| udc_mask_unused_interrupts(dev); |
| |
| /* call gadget to resume and reset configs etc. */ |
| spin_unlock(&dev->lock); |
| if (dev->sys_suspended && dev->driver->resume) { |
| dev->driver->resume(&dev->gadget); |
| dev->sys_suspended = 0; |
| } |
| dev->driver->disconnect(&dev->gadget); |
| spin_lock(&dev->lock); |
| |
| /* disable ep0 to empty req queue */ |
| empty_req_queue(&dev->ep[UDC_EP0IN_IX]); |
| ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]); |
| |
| /* soft reset when rxfifo not empty */ |
| tmp = readl(&dev->regs->sts); |
| if (!(tmp & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) |
| && !soft_reset_after_usbreset_occured) { |
| udc_soft_reset(dev); |
| soft_reset_after_usbreset_occured++; |
| } |
| |
| /* |
| * DMA reset to kill potential old DMA hw hang, |
| * POLL bit is already reset by ep_init() through |
| * disconnect() |
| */ |
| DBG(dev, "DMA machine reset\n"); |
| tmp = readl(&dev->regs->cfg); |
| writel(tmp | AMD_BIT(UDC_DEVCFG_DMARST), &dev->regs->cfg); |
| writel(tmp, &dev->regs->cfg); |
| |
| /* put into initial config */ |
| udc_basic_init(dev); |
| |
| /* enable device setup interrupts */ |
| udc_enable_dev_setup_interrupts(dev); |
| |
| /* enable suspend interrupt */ |
| tmp = readl(&dev->regs->irqmsk); |
| tmp &= AMD_UNMASK_BIT(UDC_DEVINT_US); |
| writel(tmp, &dev->regs->irqmsk); |
| |
| } /* USB suspend */ |
| if (dev_irq & AMD_BIT(UDC_DEVINT_US)) { |
| DBG(dev, "USB Suspend interrupt\n"); |
| ret_val = IRQ_HANDLED; |
| if (dev->driver->suspend) { |
| spin_unlock(&dev->lock); |
| dev->sys_suspended = 1; |
| dev->driver->suspend(&dev->gadget); |
| spin_lock(&dev->lock); |
| } |
| } /* new speed ? */ |
| if (dev_irq & AMD_BIT(UDC_DEVINT_ENUM)) { |
| DBG(dev, "ENUM interrupt\n"); |
| ret_val = IRQ_HANDLED; |
| soft_reset_after_usbreset_occured = 0; |
| |
| /* disable ep0 to empty req queue */ |
| empty_req_queue(&dev->ep[UDC_EP0IN_IX]); |
| ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]); |
| |
| /* link up all endpoints */ |
| udc_setup_endpoints(dev); |
| dev_info(&dev->pdev->dev, "Connect: %s\n", |
| usb_speed_string(dev->gadget.speed)); |
| |
| /* init ep 0 */ |
| activate_control_endpoints(dev); |
| |
| /* enable ep0 interrupts */ |
| udc_enable_ep0_interrupts(dev); |
| } |
| /* session valid change interrupt */ |
| if (dev_irq & AMD_BIT(UDC_DEVINT_SVC)) { |
| DBG(dev, "USB SVC interrupt\n"); |
| ret_val = IRQ_HANDLED; |
| |
| /* check that session is not valid to detect disconnect */ |
| tmp = readl(&dev->regs->sts); |
| if (!(tmp & AMD_BIT(UDC_DEVSTS_SESSVLD))) { |
| /* disable suspend interrupt */ |
| tmp = readl(&dev->regs->irqmsk); |
| tmp |= AMD_BIT(UDC_DEVINT_US); |
| writel(tmp, &dev->regs->irqmsk); |
| DBG(dev, "USB Disconnect (session valid low)\n"); |
| /* cleanup on disconnect */ |
| usb_disconnect(udc); |
| } |
| |
| } |
| |
| return ret_val; |
| } |
| |
| /* Interrupt Service Routine, see Linux Kernel Doc for parameters */ |
| static irqreturn_t udc_irq(int irq, void *pdev) |
| { |
| struct udc *dev = pdev; |
| u32 reg; |
| u16 i; |
| u32 ep_irq; |
| irqreturn_t ret_val = IRQ_NONE; |
| |
| spin_lock(&dev->lock); |
| |
| /* check for ep irq */ |
| reg = readl(&dev->regs->ep_irqsts); |
| if (reg) { |
| if (reg & AMD_BIT(UDC_EPINT_OUT_EP0)) |
| ret_val |= udc_control_out_isr(dev); |
| if (reg & AMD_BIT(UDC_EPINT_IN_EP0)) |
| ret_val |= udc_control_in_isr(dev); |
| |
| /* |
| * data endpoint |
| * iterate ep's |
| */ |
| for (i = 1; i < UDC_EP_NUM; i++) { |
| ep_irq = 1 << i; |
| if (!(reg & ep_irq) || i == UDC_EPINT_OUT_EP0) |
| continue; |
| |
| /* clear irq status */ |
| writel(ep_irq, &dev->regs->ep_irqsts); |
| |
| /* irq for out ep ? */ |
| if (i > UDC_EPIN_NUM) |
| ret_val |= udc_data_out_isr(dev, i); |
| else |
| ret_val |= udc_data_in_isr(dev, i); |
| } |
| |
| } |
| |
| |
| /* check for dev irq */ |
| reg = readl(&dev->regs->irqsts); |
| if (reg) { |
| /* clear irq */ |
| writel(reg, &dev->regs->irqsts); |
| ret_val |= udc_dev_isr(dev, reg); |
| } |
| |
| |
| spin_unlock(&dev->lock); |
| return ret_val; |
| } |
| |
| /* Tears down device */ |
| static void gadget_release(struct device *pdev) |
| { |
| struct amd5536udc *dev = dev_get_drvdata(pdev); |
| kfree(dev); |
| } |
| |
| /* Cleanup on device remove */ |
| static void udc_remove(struct udc *dev) |
| { |
| /* remove timer */ |
| stop_timer++; |
| if (timer_pending(&udc_timer)) |
| wait_for_completion(&on_exit); |
| if (udc_timer.data) |
| del_timer_sync(&udc_timer); |
| /* remove pollstall timer */ |
| stop_pollstall_timer++; |
| if (timer_pending(&udc_pollstall_timer)) |
| wait_for_completion(&on_pollstall_exit); |
| if (udc_pollstall_timer.data) |
| del_timer_sync(&udc_pollstall_timer); |
| udc = NULL; |
| } |
| |
| /* Reset all pci context */ |
| static void udc_pci_remove(struct pci_dev *pdev) |
| { |
| struct udc *dev; |
| |
| dev |