| /** |
| * linux/drivers/usb/gadget/s3c-hsotg.c |
| * |
| * Copyright (c) 2011 Samsung Electronics Co., Ltd. |
| * http://www.samsung.com |
| * |
| * Copyright 2008 Openmoko, Inc. |
| * Copyright 2008 Simtec Electronics |
| * Ben Dooks <ben@simtec.co.uk> |
| * http://armlinux.simtec.co.uk/ |
| * |
| * S3C USB2.0 High-speed / OtG driver |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/spinlock.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/delay.h> |
| #include <linux/io.h> |
| #include <linux/slab.h> |
| #include <linux/clk.h> |
| #include <linux/regulator/consumer.h> |
| |
| #include <linux/usb/ch9.h> |
| #include <linux/usb/gadget.h> |
| #include <linux/platform_data/s3c-hsotg.h> |
| |
| #include <mach/map.h> |
| |
| #include "s3c-hsotg.h" |
| |
| #define DMA_ADDR_INVALID (~((dma_addr_t)0)) |
| |
| static const char * const s3c_hsotg_supply_names[] = { |
| "vusb_d", /* digital USB supply, 1.2V */ |
| "vusb_a", /* analog USB supply, 1.1V */ |
| }; |
| |
| /* |
| * EP0_MPS_LIMIT |
| * |
| * Unfortunately there seems to be a limit of the amount of data that can |
| * be transferred by IN transactions on EP0. This is either 127 bytes or 3 |
| * packets (which practically means 1 packet and 63 bytes of data) when the |
| * MPS is set to 64. |
| * |
| * This means if we are wanting to move >127 bytes of data, we need to |
| * split the transactions up, but just doing one packet at a time does |
| * not work (this may be an implicit DATA0 PID on first packet of the |
| * transaction) and doing 2 packets is outside the controller's limits. |
| * |
| * If we try to lower the MPS size for EP0, then no transfers work properly |
| * for EP0, and the system will fail basic enumeration. As no cause for this |
| * has currently been found, we cannot support any large IN transfers for |
| * EP0. |
| */ |
| #define EP0_MPS_LIMIT 64 |
| |
| struct s3c_hsotg; |
| struct s3c_hsotg_req; |
| |
| /** |
| * struct s3c_hsotg_ep - driver endpoint definition. |
| * @ep: The gadget layer representation of the endpoint. |
| * @name: The driver generated name for the endpoint. |
| * @queue: Queue of requests for this endpoint. |
| * @parent: Reference back to the parent device structure. |
| * @req: The current request that the endpoint is processing. This is |
| * used to indicate an request has been loaded onto the endpoint |
| * and has yet to be completed (maybe due to data move, or simply |
| * awaiting an ack from the core all the data has been completed). |
| * @debugfs: File entry for debugfs file for this endpoint. |
| * @lock: State lock to protect contents of endpoint. |
| * @dir_in: Set to true if this endpoint is of the IN direction, which |
| * means that it is sending data to the Host. |
| * @index: The index for the endpoint registers. |
| * @name: The name array passed to the USB core. |
| * @halted: Set if the endpoint has been halted. |
| * @periodic: Set if this is a periodic ep, such as Interrupt |
| * @sent_zlp: Set if we've sent a zero-length packet. |
| * @total_data: The total number of data bytes done. |
| * @fifo_size: The size of the FIFO (for periodic IN endpoints) |
| * @fifo_load: The amount of data loaded into the FIFO (periodic IN) |
| * @last_load: The offset of data for the last start of request. |
| * @size_loaded: The last loaded size for DxEPTSIZE for periodic IN |
| * |
| * This is the driver's state for each registered enpoint, allowing it |
| * to keep track of transactions that need doing. Each endpoint has a |
| * lock to protect the state, to try and avoid using an overall lock |
| * for the host controller as much as possible. |
| * |
| * For periodic IN endpoints, we have fifo_size and fifo_load to try |
| * and keep track of the amount of data in the periodic FIFO for each |
| * of these as we don't have a status register that tells us how much |
| * is in each of them. (note, this may actually be useless information |
| * as in shared-fifo mode periodic in acts like a single-frame packet |
| * buffer than a fifo) |
| */ |
| struct s3c_hsotg_ep { |
| struct usb_ep ep; |
| struct list_head queue; |
| struct s3c_hsotg *parent; |
| struct s3c_hsotg_req *req; |
| struct dentry *debugfs; |
| |
| |
| unsigned long total_data; |
| unsigned int size_loaded; |
| unsigned int last_load; |
| unsigned int fifo_load; |
| unsigned short fifo_size; |
| |
| unsigned char dir_in; |
| unsigned char index; |
| |
| unsigned int halted:1; |
| unsigned int periodic:1; |
| unsigned int sent_zlp:1; |
| |
| char name[10]; |
| }; |
| |
| /** |
| * struct s3c_hsotg - driver state. |
| * @dev: The parent device supplied to the probe function |
| * @driver: USB gadget driver |
| * @plat: The platform specific configuration data. |
| * @regs: The memory area mapped for accessing registers. |
| * @irq: The IRQ number we are using |
| * @supplies: Definition of USB power supplies |
| * @dedicated_fifos: Set if the hardware has dedicated IN-EP fifos. |
| * @num_of_eps: Number of available EPs (excluding EP0) |
| * @debug_root: root directrory for debugfs. |
| * @debug_file: main status file for debugfs. |
| * @debug_fifo: FIFO status file for debugfs. |
| * @ep0_reply: Request used for ep0 reply. |
| * @ep0_buff: Buffer for EP0 reply data, if needed. |
| * @ctrl_buff: Buffer for EP0 control requests. |
| * @ctrl_req: Request for EP0 control packets. |
| * @setup: NAK management for EP0 SETUP |
| * @last_rst: Time of last reset |
| * @eps: The endpoints being supplied to the gadget framework |
| */ |
| struct s3c_hsotg { |
| struct device *dev; |
| struct usb_gadget_driver *driver; |
| struct s3c_hsotg_plat *plat; |
| |
| spinlock_t lock; |
| |
| void __iomem *regs; |
| int irq; |
| struct clk *clk; |
| |
| struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsotg_supply_names)]; |
| |
| unsigned int dedicated_fifos:1; |
| unsigned char num_of_eps; |
| |
| struct dentry *debug_root; |
| struct dentry *debug_file; |
| struct dentry *debug_fifo; |
| |
| struct usb_request *ep0_reply; |
| struct usb_request *ctrl_req; |
| u8 ep0_buff[8]; |
| u8 ctrl_buff[8]; |
| |
| struct usb_gadget gadget; |
| unsigned int setup; |
| unsigned long last_rst; |
| struct s3c_hsotg_ep *eps; |
| }; |
| |
| /** |
| * struct s3c_hsotg_req - data transfer request |
| * @req: The USB gadget request |
| * @queue: The list of requests for the endpoint this is queued for. |
| * @in_progress: Has already had size/packets written to core |
| * @mapped: DMA buffer for this request has been mapped via dma_map_single(). |
| */ |
| struct s3c_hsotg_req { |
| struct usb_request req; |
| struct list_head queue; |
| unsigned char in_progress; |
| unsigned char mapped; |
| }; |
| |
| /* conversion functions */ |
| static inline struct s3c_hsotg_req *our_req(struct usb_request *req) |
| { |
| return container_of(req, struct s3c_hsotg_req, req); |
| } |
| |
| static inline struct s3c_hsotg_ep *our_ep(struct usb_ep *ep) |
| { |
| return container_of(ep, struct s3c_hsotg_ep, ep); |
| } |
| |
| static inline struct s3c_hsotg *to_hsotg(struct usb_gadget *gadget) |
| { |
| return container_of(gadget, struct s3c_hsotg, gadget); |
| } |
| |
| static inline void __orr32(void __iomem *ptr, u32 val) |
| { |
| writel(readl(ptr) | val, ptr); |
| } |
| |
| static inline void __bic32(void __iomem *ptr, u32 val) |
| { |
| writel(readl(ptr) & ~val, ptr); |
| } |
| |
| /* forward decleration of functions */ |
| static void s3c_hsotg_dump(struct s3c_hsotg *hsotg); |
| |
| /** |
| * using_dma - return the DMA status of the driver. |
| * @hsotg: The driver state. |
| * |
| * Return true if we're using DMA. |
| * |
| * Currently, we have the DMA support code worked into everywhere |
| * that needs it, but the AMBA DMA implementation in the hardware can |
| * only DMA from 32bit aligned addresses. This means that gadgets such |
| * as the CDC Ethernet cannot work as they often pass packets which are |
| * not 32bit aligned. |
| * |
| * Unfortunately the choice to use DMA or not is global to the controller |
| * and seems to be only settable when the controller is being put through |
| * a core reset. This means we either need to fix the gadgets to take |
| * account of DMA alignment, or add bounce buffers (yuerk). |
| * |
| * Until this issue is sorted out, we always return 'false'. |
| */ |
| static inline bool using_dma(struct s3c_hsotg *hsotg) |
| { |
| return false; /* support is not complete */ |
| } |
| |
| /** |
| * s3c_hsotg_en_gsint - enable one or more of the general interrupt |
| * @hsotg: The device state |
| * @ints: A bitmask of the interrupts to enable |
| */ |
| static void s3c_hsotg_en_gsint(struct s3c_hsotg *hsotg, u32 ints) |
| { |
| u32 gsintmsk = readl(hsotg->regs + GINTMSK); |
| u32 new_gsintmsk; |
| |
| new_gsintmsk = gsintmsk | ints; |
| |
| if (new_gsintmsk != gsintmsk) { |
| dev_dbg(hsotg->dev, "gsintmsk now 0x%08x\n", new_gsintmsk); |
| writel(new_gsintmsk, hsotg->regs + GINTMSK); |
| } |
| } |
| |
| /** |
| * s3c_hsotg_disable_gsint - disable one or more of the general interrupt |
| * @hsotg: The device state |
| * @ints: A bitmask of the interrupts to enable |
| */ |
| static void s3c_hsotg_disable_gsint(struct s3c_hsotg *hsotg, u32 ints) |
| { |
| u32 gsintmsk = readl(hsotg->regs + GINTMSK); |
| u32 new_gsintmsk; |
| |
| new_gsintmsk = gsintmsk & ~ints; |
| |
| if (new_gsintmsk != gsintmsk) |
| writel(new_gsintmsk, hsotg->regs + GINTMSK); |
| } |
| |
| /** |
| * s3c_hsotg_ctrl_epint - enable/disable an endpoint irq |
| * @hsotg: The device state |
| * @ep: The endpoint index |
| * @dir_in: True if direction is in. |
| * @en: The enable value, true to enable |
| * |
| * Set or clear the mask for an individual endpoint's interrupt |
| * request. |
| */ |
| static void s3c_hsotg_ctrl_epint(struct s3c_hsotg *hsotg, |
| unsigned int ep, unsigned int dir_in, |
| unsigned int en) |
| { |
| unsigned long flags; |
| u32 bit = 1 << ep; |
| u32 daint; |
| |
| if (!dir_in) |
| bit <<= 16; |
| |
| local_irq_save(flags); |
| daint = readl(hsotg->regs + DAINTMSK); |
| if (en) |
| daint |= bit; |
| else |
| daint &= ~bit; |
| writel(daint, hsotg->regs + DAINTMSK); |
| local_irq_restore(flags); |
| } |
| |
| /** |
| * s3c_hsotg_init_fifo - initialise non-periodic FIFOs |
| * @hsotg: The device instance. |
| */ |
| static void s3c_hsotg_init_fifo(struct s3c_hsotg *hsotg) |
| { |
| unsigned int ep; |
| unsigned int addr; |
| unsigned int size; |
| int timeout; |
| u32 val; |
| |
| /* set FIFO sizes to 2048/1024 */ |
| |
| writel(2048, hsotg->regs + GRXFSIZ); |
| writel(GNPTXFSIZ_NPTxFStAddr(2048) | |
| GNPTXFSIZ_NPTxFDep(1024), |
| hsotg->regs + GNPTXFSIZ); |
| |
| /* |
| * arange all the rest of the TX FIFOs, as some versions of this |
| * block have overlapping default addresses. This also ensures |
| * that if the settings have been changed, then they are set to |
| * known values. |
| */ |
| |
| /* start at the end of the GNPTXFSIZ, rounded up */ |
| addr = 2048 + 1024; |
| size = 768; |
| |
| /* |
| * currently we allocate TX FIFOs for all possible endpoints, |
| * and assume that they are all the same size. |
| */ |
| |
| for (ep = 1; ep <= 15; ep++) { |
| val = addr; |
| val |= size << DPTXFSIZn_DPTxFSize_SHIFT; |
| addr += size; |
| |
| writel(val, hsotg->regs + DPTXFSIZn(ep)); |
| } |
| |
| /* |
| * according to p428 of the design guide, we need to ensure that |
| * all fifos are flushed before continuing |
| */ |
| |
| writel(GRSTCTL_TxFNum(0x10) | GRSTCTL_TxFFlsh | |
| GRSTCTL_RxFFlsh, hsotg->regs + GRSTCTL); |
| |
| /* wait until the fifos are both flushed */ |
| timeout = 100; |
| while (1) { |
| val = readl(hsotg->regs + GRSTCTL); |
| |
| if ((val & (GRSTCTL_TxFFlsh | GRSTCTL_RxFFlsh)) == 0) |
| break; |
| |
| if (--timeout == 0) { |
| dev_err(hsotg->dev, |
| "%s: timeout flushing fifos (GRSTCTL=%08x)\n", |
| __func__, val); |
| } |
| |
| udelay(1); |
| } |
| |
| dev_dbg(hsotg->dev, "FIFOs reset, timeout at %d\n", timeout); |
| } |
| |
| /** |
| * @ep: USB endpoint to allocate request for. |
| * @flags: Allocation flags |
| * |
| * Allocate a new USB request structure appropriate for the specified endpoint |
| */ |
| static struct usb_request *s3c_hsotg_ep_alloc_request(struct usb_ep *ep, |
| gfp_t flags) |
| { |
| struct s3c_hsotg_req *req; |
| |
| req = kzalloc(sizeof(struct s3c_hsotg_req), flags); |
| if (!req) |
| return NULL; |
| |
| INIT_LIST_HEAD(&req->queue); |
| |
| req->req.dma = DMA_ADDR_INVALID; |
| return &req->req; |
| } |
| |
| /** |
| * is_ep_periodic - return true if the endpoint is in periodic mode. |
| * @hs_ep: The endpoint to query. |
| * |
| * Returns true if the endpoint is in periodic mode, meaning it is being |
| * used for an Interrupt or ISO transfer. |
| */ |
| static inline int is_ep_periodic(struct s3c_hsotg_ep *hs_ep) |
| { |
| return hs_ep->periodic; |
| } |
| |
| /** |
| * s3c_hsotg_unmap_dma - unmap the DMA memory being used for the request |
| * @hsotg: The device state. |
| * @hs_ep: The endpoint for the request |
| * @hs_req: The request being processed. |
| * |
| * This is the reverse of s3c_hsotg_map_dma(), called for the completion |
| * of a request to ensure the buffer is ready for access by the caller. |
| */ |
| static void s3c_hsotg_unmap_dma(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *hs_ep, |
| struct s3c_hsotg_req *hs_req) |
| { |
| struct usb_request *req = &hs_req->req; |
| enum dma_data_direction dir; |
| |
| dir = hs_ep->dir_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE; |
| |
| /* ignore this if we're not moving any data */ |
| if (hs_req->req.length == 0) |
| return; |
| |
| if (hs_req->mapped) { |
| /* we mapped this, so unmap and remove the dma */ |
| |
| dma_unmap_single(hsotg->dev, req->dma, req->length, dir); |
| |
| req->dma = DMA_ADDR_INVALID; |
| hs_req->mapped = 0; |
| } else { |
| dma_sync_single_for_cpu(hsotg->dev, req->dma, req->length, dir); |
| } |
| } |
| |
| /** |
| * s3c_hsotg_write_fifo - write packet Data to the TxFIFO |
| * @hsotg: The controller state. |
| * @hs_ep: The endpoint we're going to write for. |
| * @hs_req: The request to write data for. |
| * |
| * This is called when the TxFIFO has some space in it to hold a new |
| * transmission and we have something to give it. The actual setup of |
| * the data size is done elsewhere, so all we have to do is to actually |
| * write the data. |
| * |
| * The return value is zero if there is more space (or nothing was done) |
| * otherwise -ENOSPC is returned if the FIFO space was used up. |
| * |
| * This routine is only needed for PIO |
| */ |
| static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *hs_ep, |
| struct s3c_hsotg_req *hs_req) |
| { |
| bool periodic = is_ep_periodic(hs_ep); |
| u32 gnptxsts = readl(hsotg->regs + GNPTXSTS); |
| int buf_pos = hs_req->req.actual; |
| int to_write = hs_ep->size_loaded; |
| void *data; |
| int can_write; |
| int pkt_round; |
| |
| to_write -= (buf_pos - hs_ep->last_load); |
| |
| /* if there's nothing to write, get out early */ |
| if (to_write == 0) |
| return 0; |
| |
| if (periodic && !hsotg->dedicated_fifos) { |
| u32 epsize = readl(hsotg->regs + DIEPTSIZ(hs_ep->index)); |
| int size_left; |
| int size_done; |
| |
| /* |
| * work out how much data was loaded so we can calculate |
| * how much data is left in the fifo. |
| */ |
| |
| size_left = DxEPTSIZ_XferSize_GET(epsize); |
| |
| /* |
| * if shared fifo, we cannot write anything until the |
| * previous data has been completely sent. |
| */ |
| if (hs_ep->fifo_load != 0) { |
| s3c_hsotg_en_gsint(hsotg, GINTSTS_PTxFEmp); |
| return -ENOSPC; |
| } |
| |
| dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n", |
| __func__, size_left, |
| hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size); |
| |
| /* how much of the data has moved */ |
| size_done = hs_ep->size_loaded - size_left; |
| |
| /* how much data is left in the fifo */ |
| can_write = hs_ep->fifo_load - size_done; |
| dev_dbg(hsotg->dev, "%s: => can_write1=%d\n", |
| __func__, can_write); |
| |
| can_write = hs_ep->fifo_size - can_write; |
| dev_dbg(hsotg->dev, "%s: => can_write2=%d\n", |
| __func__, can_write); |
| |
| if (can_write <= 0) { |
| s3c_hsotg_en_gsint(hsotg, GINTSTS_PTxFEmp); |
| return -ENOSPC; |
| } |
| } else if (hsotg->dedicated_fifos && hs_ep->index != 0) { |
| can_write = readl(hsotg->regs + DTXFSTS(hs_ep->index)); |
| |
| can_write &= 0xffff; |
| can_write *= 4; |
| } else { |
| if (GNPTXSTS_NPTxQSpcAvail_GET(gnptxsts) == 0) { |
| dev_dbg(hsotg->dev, |
| "%s: no queue slots available (0x%08x)\n", |
| __func__, gnptxsts); |
| |
| s3c_hsotg_en_gsint(hsotg, GINTSTS_NPTxFEmp); |
| return -ENOSPC; |
| } |
| |
| can_write = GNPTXSTS_NPTxFSpcAvail_GET(gnptxsts); |
| can_write *= 4; /* fifo size is in 32bit quantities. */ |
| } |
| |
| dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, mps %d\n", |
| __func__, gnptxsts, can_write, to_write, hs_ep->ep.maxpacket); |
| |
| /* |
| * limit to 512 bytes of data, it seems at least on the non-periodic |
| * FIFO, requests of >512 cause the endpoint to get stuck with a |
| * fragment of the end of the transfer in it. |
| */ |
| if (can_write > 512) |
| can_write = 512; |
| |
| /* |
| * limit the write to one max-packet size worth of data, but allow |
| * the transfer to return that it did not run out of fifo space |
| * doing it. |
| */ |
| if (to_write > hs_ep->ep.maxpacket) { |
| to_write = hs_ep->ep.maxpacket; |
| |
| s3c_hsotg_en_gsint(hsotg, |
| periodic ? GINTSTS_PTxFEmp : |
| GINTSTS_NPTxFEmp); |
| } |
| |
| /* see if we can write data */ |
| |
| if (to_write > can_write) { |
| to_write = can_write; |
| pkt_round = to_write % hs_ep->ep.maxpacket; |
| |
| /* |
| * Round the write down to an |
| * exact number of packets. |
| * |
| * Note, we do not currently check to see if we can ever |
| * write a full packet or not to the FIFO. |
| */ |
| |
| if (pkt_round) |
| to_write -= pkt_round; |
| |
| /* |
| * enable correct FIFO interrupt to alert us when there |
| * is more room left. |
| */ |
| |
| s3c_hsotg_en_gsint(hsotg, |
| periodic ? GINTSTS_PTxFEmp : |
| GINTSTS_NPTxFEmp); |
| } |
| |
| dev_dbg(hsotg->dev, "write %d/%d, can_write %d, done %d\n", |
| to_write, hs_req->req.length, can_write, buf_pos); |
| |
| if (to_write <= 0) |
| return -ENOSPC; |
| |
| hs_req->req.actual = buf_pos + to_write; |
| hs_ep->total_data += to_write; |
| |
| if (periodic) |
| hs_ep->fifo_load += to_write; |
| |
| to_write = DIV_ROUND_UP(to_write, 4); |
| data = hs_req->req.buf + buf_pos; |
| |
| writesl(hsotg->regs + EPFIFO(hs_ep->index), data, to_write); |
| |
| return (to_write >= can_write) ? -ENOSPC : 0; |
| } |
| |
| /** |
| * get_ep_limit - get the maximum data legnth for this endpoint |
| * @hs_ep: The endpoint |
| * |
| * Return the maximum data that can be queued in one go on a given endpoint |
| * so that transfers that are too long can be split. |
| */ |
| static unsigned get_ep_limit(struct s3c_hsotg_ep *hs_ep) |
| { |
| int index = hs_ep->index; |
| unsigned maxsize; |
| unsigned maxpkt; |
| |
| if (index != 0) { |
| maxsize = DxEPTSIZ_XferSize_LIMIT + 1; |
| maxpkt = DxEPTSIZ_PktCnt_LIMIT + 1; |
| } else { |
| maxsize = 64+64; |
| if (hs_ep->dir_in) |
| maxpkt = DIEPTSIZ0_PktCnt_LIMIT + 1; |
| else |
| maxpkt = 2; |
| } |
| |
| /* we made the constant loading easier above by using +1 */ |
| maxpkt--; |
| maxsize--; |
| |
| /* |
| * constrain by packet count if maxpkts*pktsize is greater |
| * than the length register size. |
| */ |
| |
| if ((maxpkt * hs_ep->ep.maxpacket) < maxsize) |
| maxsize = maxpkt * hs_ep->ep.maxpacket; |
| |
| return maxsize; |
| } |
| |
| /** |
| * s3c_hsotg_start_req - start a USB request from an endpoint's queue |
| * @hsotg: The controller state. |
| * @hs_ep: The endpoint to process a request for |
| * @hs_req: The request to start. |
| * @continuing: True if we are doing more for the current request. |
| * |
| * Start the given request running by setting the endpoint registers |
| * appropriately, and writing any data to the FIFOs. |
| */ |
| static void s3c_hsotg_start_req(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *hs_ep, |
| struct s3c_hsotg_req *hs_req, |
| bool continuing) |
| { |
| struct usb_request *ureq = &hs_req->req; |
| int index = hs_ep->index; |
| int dir_in = hs_ep->dir_in; |
| u32 epctrl_reg; |
| u32 epsize_reg; |
| u32 epsize; |
| u32 ctrl; |
| unsigned length; |
| unsigned packets; |
| unsigned maxreq; |
| |
| if (index != 0) { |
| if (hs_ep->req && !continuing) { |
| dev_err(hsotg->dev, "%s: active request\n", __func__); |
| WARN_ON(1); |
| return; |
| } else if (hs_ep->req != hs_req && continuing) { |
| dev_err(hsotg->dev, |
| "%s: continue different req\n", __func__); |
| WARN_ON(1); |
| return; |
| } |
| } |
| |
| epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); |
| epsize_reg = dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index); |
| |
| dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x, ep %d, dir %s\n", |
| __func__, readl(hsotg->regs + epctrl_reg), index, |
| hs_ep->dir_in ? "in" : "out"); |
| |
| /* If endpoint is stalled, we will restart request later */ |
| ctrl = readl(hsotg->regs + epctrl_reg); |
| |
| if (ctrl & DxEPCTL_Stall) { |
| dev_warn(hsotg->dev, "%s: ep%d is stalled\n", __func__, index); |
| return; |
| } |
| |
| length = ureq->length - ureq->actual; |
| dev_dbg(hsotg->dev, "ureq->length:%d ureq->actual:%d\n", |
| ureq->length, ureq->actual); |
| if (0) |
| dev_dbg(hsotg->dev, |
| "REQ buf %p len %d dma 0x%08x noi=%d zp=%d snok=%d\n", |
| ureq->buf, length, ureq->dma, |
| ureq->no_interrupt, ureq->zero, ureq->short_not_ok); |
| |
| maxreq = get_ep_limit(hs_ep); |
| if (length > maxreq) { |
| int round = maxreq % hs_ep->ep.maxpacket; |
| |
| dev_dbg(hsotg->dev, "%s: length %d, max-req %d, r %d\n", |
| __func__, length, maxreq, round); |
| |
| /* round down to multiple of packets */ |
| if (round) |
| maxreq -= round; |
| |
| length = maxreq; |
| } |
| |
| if (length) |
| packets = DIV_ROUND_UP(length, hs_ep->ep.maxpacket); |
| else |
| packets = 1; /* send one packet if length is zero. */ |
| |
| if (dir_in && index != 0) |
| epsize = DxEPTSIZ_MC(1); |
| else |
| epsize = 0; |
| |
| if (index != 0 && ureq->zero) { |
| /* |
| * test for the packets being exactly right for the |
| * transfer |
| */ |
| |
| if (length == (packets * hs_ep->ep.maxpacket)) |
| packets++; |
| } |
| |
| epsize |= DxEPTSIZ_PktCnt(packets); |
| epsize |= DxEPTSIZ_XferSize(length); |
| |
| dev_dbg(hsotg->dev, "%s: %d@%d/%d, 0x%08x => 0x%08x\n", |
| __func__, packets, length, ureq->length, epsize, epsize_reg); |
| |
| /* store the request as the current one we're doing */ |
| hs_ep->req = hs_req; |
| |
| /* write size / packets */ |
| writel(epsize, hsotg->regs + epsize_reg); |
| |
| if (using_dma(hsotg) && !continuing) { |
| unsigned int dma_reg; |
| |
| /* |
| * write DMA address to control register, buffer already |
| * synced by s3c_hsotg_ep_queue(). |
| */ |
| |
| dma_reg = dir_in ? DIEPDMA(index) : DOEPDMA(index); |
| writel(ureq->dma, hsotg->regs + dma_reg); |
| |
| dev_dbg(hsotg->dev, "%s: 0x%08x => 0x%08x\n", |
| __func__, ureq->dma, dma_reg); |
| } |
| |
| ctrl |= DxEPCTL_EPEna; /* ensure ep enabled */ |
| ctrl |= DxEPCTL_USBActEp; |
| |
| dev_dbg(hsotg->dev, "setup req:%d\n", hsotg->setup); |
| |
| /* For Setup request do not clear NAK */ |
| if (hsotg->setup && index == 0) |
| hsotg->setup = 0; |
| else |
| ctrl |= DxEPCTL_CNAK; /* clear NAK set by core */ |
| |
| |
| dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl); |
| writel(ctrl, hsotg->regs + epctrl_reg); |
| |
| /* |
| * set these, it seems that DMA support increments past the end |
| * of the packet buffer so we need to calculate the length from |
| * this information. |
| */ |
| hs_ep->size_loaded = length; |
| hs_ep->last_load = ureq->actual; |
| |
| if (dir_in && !using_dma(hsotg)) { |
| /* set these anyway, we may need them for non-periodic in */ |
| hs_ep->fifo_load = 0; |
| |
| s3c_hsotg_write_fifo(hsotg, hs_ep, hs_req); |
| } |
| |
| /* |
| * clear the INTknTXFEmpMsk when we start request, more as a aide |
| * to debugging to see what is going on. |
| */ |
| if (dir_in) |
| writel(DIEPMSK_INTknTXFEmpMsk, |
| hsotg->regs + DIEPINT(index)); |
| |
| /* |
| * Note, trying to clear the NAK here causes problems with transmit |
| * on the S3C6400 ending up with the TXFIFO becoming full. |
| */ |
| |
| /* check ep is enabled */ |
| if (!(readl(hsotg->regs + epctrl_reg) & DxEPCTL_EPEna)) |
| dev_warn(hsotg->dev, |
| "ep%d: failed to become enabled (DxEPCTL=0x%08x)?\n", |
| index, readl(hsotg->regs + epctrl_reg)); |
| |
| dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", |
| __func__, readl(hsotg->regs + epctrl_reg)); |
| } |
| |
| /** |
| * s3c_hsotg_map_dma - map the DMA memory being used for the request |
| * @hsotg: The device state. |
| * @hs_ep: The endpoint the request is on. |
| * @req: The request being processed. |
| * |
| * We've been asked to queue a request, so ensure that the memory buffer |
| * is correctly setup for DMA. If we've been passed an extant DMA address |
| * then ensure the buffer has been synced to memory. If our buffer has no |
| * DMA memory, then we map the memory and mark our request to allow us to |
| * cleanup on completion. |
| */ |
| static int s3c_hsotg_map_dma(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *hs_ep, |
| struct usb_request *req) |
| { |
| enum dma_data_direction dir; |
| struct s3c_hsotg_req *hs_req = our_req(req); |
| |
| dir = hs_ep->dir_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE; |
| |
| /* if the length is zero, ignore the DMA data */ |
| if (hs_req->req.length == 0) |
| return 0; |
| |
| if (req->dma == DMA_ADDR_INVALID) { |
| dma_addr_t dma; |
| |
| dma = dma_map_single(hsotg->dev, req->buf, req->length, dir); |
| |
| if (unlikely(dma_mapping_error(hsotg->dev, dma))) |
| goto dma_error; |
| |
| if (dma & 3) { |
| dev_err(hsotg->dev, "%s: unaligned dma buffer\n", |
| __func__); |
| |
| dma_unmap_single(hsotg->dev, dma, req->length, dir); |
| return -EINVAL; |
| } |
| |
| hs_req->mapped = 1; |
| req->dma = dma; |
| } else { |
| dma_sync_single_for_cpu(hsotg->dev, req->dma, req->length, dir); |
| hs_req->mapped = 0; |
| } |
| |
| return 0; |
| |
| dma_error: |
| dev_err(hsotg->dev, "%s: failed to map buffer %p, %d bytes\n", |
| __func__, req->buf, req->length); |
| |
| return -EIO; |
| } |
| |
| static int s3c_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req, |
| gfp_t gfp_flags) |
| { |
| struct s3c_hsotg_req *hs_req = our_req(req); |
| struct s3c_hsotg_ep *hs_ep = our_ep(ep); |
| struct s3c_hsotg *hs = hs_ep->parent; |
| bool first; |
| |
| dev_dbg(hs->dev, "%s: req %p: %d@%p, noi=%d, zero=%d, snok=%d\n", |
| ep->name, req, req->length, req->buf, req->no_interrupt, |
| req->zero, req->short_not_ok); |
| |
| /* initialise status of the request */ |
| INIT_LIST_HEAD(&hs_req->queue); |
| req->actual = 0; |
| req->status = -EINPROGRESS; |
| |
| /* if we're using DMA, sync the buffers as necessary */ |
| if (using_dma(hs)) { |
| int ret = s3c_hsotg_map_dma(hs, hs_ep, req); |
| if (ret) |
| return ret; |
| } |
| |
| first = list_empty(&hs_ep->queue); |
| list_add_tail(&hs_req->queue, &hs_ep->queue); |
| |
| if (first) |
| s3c_hsotg_start_req(hs, hs_ep, hs_req, false); |
| |
| return 0; |
| } |
| |
| static int s3c_hsotg_ep_queue_lock(struct usb_ep *ep, struct usb_request *req, |
| gfp_t gfp_flags) |
| { |
| struct s3c_hsotg_ep *hs_ep = our_ep(ep); |
| struct s3c_hsotg *hs = hs_ep->parent; |
| unsigned long flags = 0; |
| int ret = 0; |
| |
| spin_lock_irqsave(&hs->lock, flags); |
| ret = s3c_hsotg_ep_queue(ep, req, gfp_flags); |
| spin_unlock_irqrestore(&hs->lock, flags); |
| |
| return ret; |
| } |
| |
| static void s3c_hsotg_ep_free_request(struct usb_ep *ep, |
| struct usb_request *req) |
| { |
| struct s3c_hsotg_req *hs_req = our_req(req); |
| |
| kfree(hs_req); |
| } |
| |
| /** |
| * s3c_hsotg_complete_oursetup - setup completion callback |
| * @ep: The endpoint the request was on. |
| * @req: The request completed. |
| * |
| * Called on completion of any requests the driver itself |
| * submitted that need cleaning up. |
| */ |
| static void s3c_hsotg_complete_oursetup(struct usb_ep *ep, |
| struct usb_request *req) |
| { |
| struct s3c_hsotg_ep *hs_ep = our_ep(ep); |
| struct s3c_hsotg *hsotg = hs_ep->parent; |
| |
| dev_dbg(hsotg->dev, "%s: ep %p, req %p\n", __func__, ep, req); |
| |
| s3c_hsotg_ep_free_request(ep, req); |
| } |
| |
| /** |
| * ep_from_windex - convert control wIndex value to endpoint |
| * @hsotg: The driver state. |
| * @windex: The control request wIndex field (in host order). |
| * |
| * Convert the given wIndex into a pointer to an driver endpoint |
| * structure, or return NULL if it is not a valid endpoint. |
| */ |
| static struct s3c_hsotg_ep *ep_from_windex(struct s3c_hsotg *hsotg, |
| u32 windex) |
| { |
| struct s3c_hsotg_ep *ep = &hsotg->eps[windex & 0x7F]; |
| int dir = (windex & USB_DIR_IN) ? 1 : 0; |
| int idx = windex & 0x7F; |
| |
| if (windex >= 0x100) |
| return NULL; |
| |
| if (idx > hsotg->num_of_eps) |
| return NULL; |
| |
| if (idx && ep->dir_in != dir) |
| return NULL; |
| |
| return ep; |
| } |
| |
| /** |
| * s3c_hsotg_send_reply - send reply to control request |
| * @hsotg: The device state |
| * @ep: Endpoint 0 |
| * @buff: Buffer for request |
| * @length: Length of reply. |
| * |
| * Create a request and queue it on the given endpoint. This is useful as |
| * an internal method of sending replies to certain control requests, etc. |
| */ |
| static int s3c_hsotg_send_reply(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *ep, |
| void *buff, |
| int length) |
| { |
| struct usb_request *req; |
| int ret; |
| |
| dev_dbg(hsotg->dev, "%s: buff %p, len %d\n", __func__, buff, length); |
| |
| req = s3c_hsotg_ep_alloc_request(&ep->ep, GFP_ATOMIC); |
| hsotg->ep0_reply = req; |
| if (!req) { |
| dev_warn(hsotg->dev, "%s: cannot alloc req\n", __func__); |
| return -ENOMEM; |
| } |
| |
| req->buf = hsotg->ep0_buff; |
| req->length = length; |
| req->zero = 1; /* always do zero-length final transfer */ |
| req->complete = s3c_hsotg_complete_oursetup; |
| |
| if (length) |
| memcpy(req->buf, buff, length); |
| else |
| ep->sent_zlp = 1; |
| |
| ret = s3c_hsotg_ep_queue(&ep->ep, req, GFP_ATOMIC); |
| if (ret) { |
| dev_warn(hsotg->dev, "%s: cannot queue req\n", __func__); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * s3c_hsotg_process_req_status - process request GET_STATUS |
| * @hsotg: The device state |
| * @ctrl: USB control request |
| */ |
| static int s3c_hsotg_process_req_status(struct s3c_hsotg *hsotg, |
| struct usb_ctrlrequest *ctrl) |
| { |
| struct s3c_hsotg_ep *ep0 = &hsotg->eps[0]; |
| struct s3c_hsotg_ep *ep; |
| __le16 reply; |
| int ret; |
| |
| dev_dbg(hsotg->dev, "%s: USB_REQ_GET_STATUS\n", __func__); |
| |
| if (!ep0->dir_in) { |
| dev_warn(hsotg->dev, "%s: direction out?\n", __func__); |
| return -EINVAL; |
| } |
| |
| switch (ctrl->bRequestType & USB_RECIP_MASK) { |
| case USB_RECIP_DEVICE: |
| reply = cpu_to_le16(0); /* bit 0 => self powered, |
| * bit 1 => remote wakeup */ |
| break; |
| |
| case USB_RECIP_INTERFACE: |
| /* currently, the data result should be zero */ |
| reply = cpu_to_le16(0); |
| break; |
| |
| case USB_RECIP_ENDPOINT: |
| ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex)); |
| if (!ep) |
| return -ENOENT; |
| |
| reply = cpu_to_le16(ep->halted ? 1 : 0); |
| break; |
| |
| default: |
| return 0; |
| } |
| |
| if (le16_to_cpu(ctrl->wLength) != 2) |
| return -EINVAL; |
| |
| ret = s3c_hsotg_send_reply(hsotg, ep0, &reply, 2); |
| if (ret) { |
| dev_err(hsotg->dev, "%s: failed to send reply\n", __func__); |
| return ret; |
| } |
| |
| return 1; |
| } |
| |
| static int s3c_hsotg_ep_sethalt(struct usb_ep *ep, int value); |
| |
| /** |
| * get_ep_head - return the first request on the endpoint |
| * @hs_ep: The controller endpoint to get |
| * |
| * Get the first request on the endpoint. |
| */ |
| static struct s3c_hsotg_req *get_ep_head(struct s3c_hsotg_ep *hs_ep) |
| { |
| if (list_empty(&hs_ep->queue)) |
| return NULL; |
| |
| return list_first_entry(&hs_ep->queue, struct s3c_hsotg_req, queue); |
| } |
| |
| /** |
| * s3c_hsotg_process_req_featire - process request {SET,CLEAR}_FEATURE |
| * @hsotg: The device state |
| * @ctrl: USB control request |
| */ |
| static int s3c_hsotg_process_req_feature(struct s3c_hsotg *hsotg, |
| struct usb_ctrlrequest *ctrl) |
| { |
| struct s3c_hsotg_ep *ep0 = &hsotg->eps[0]; |
| struct s3c_hsotg_req *hs_req; |
| bool restart; |
| bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE); |
| struct s3c_hsotg_ep *ep; |
| int ret; |
| |
| dev_dbg(hsotg->dev, "%s: %s_FEATURE\n", |
| __func__, set ? "SET" : "CLEAR"); |
| |
| if (ctrl->bRequestType == USB_RECIP_ENDPOINT) { |
| ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex)); |
| if (!ep) { |
| dev_dbg(hsotg->dev, "%s: no endpoint for 0x%04x\n", |
| __func__, le16_to_cpu(ctrl->wIndex)); |
| return -ENOENT; |
| } |
| |
| switch (le16_to_cpu(ctrl->wValue)) { |
| case USB_ENDPOINT_HALT: |
| s3c_hsotg_ep_sethalt(&ep->ep, set); |
| |
| ret = s3c_hsotg_send_reply(hsotg, ep0, NULL, 0); |
| if (ret) { |
| dev_err(hsotg->dev, |
| "%s: failed to send reply\n", __func__); |
| return ret; |
| } |
| |
| if (!set) { |
| /* |
| * If we have request in progress, |
| * then complete it |
| */ |
| if (ep->req) { |
| hs_req = ep->req; |
| ep->req = NULL; |
| list_del_init(&hs_req->queue); |
| hs_req->req.complete(&ep->ep, |
| &hs_req->req); |
| } |
| |
| /* If we have pending request, then start it */ |
| restart = !list_empty(&ep->queue); |
| if (restart) { |
| hs_req = get_ep_head(ep); |
| s3c_hsotg_start_req(hsotg, ep, |
| hs_req, false); |
| } |
| } |
| |
| break; |
| |
| default: |
| return -ENOENT; |
| } |
| } else |
| return -ENOENT; /* currently only deal with endpoint */ |
| |
| return 1; |
| } |
| |
| /** |
| * s3c_hsotg_process_control - process a control request |
| * @hsotg: The device state |
| * @ctrl: The control request received |
| * |
| * The controller has received the SETUP phase of a control request, and |
| * needs to work out what to do next (and whether to pass it on to the |
| * gadget driver). |
| */ |
| static void s3c_hsotg_process_control(struct s3c_hsotg *hsotg, |
| struct usb_ctrlrequest *ctrl) |
| { |
| struct s3c_hsotg_ep *ep0 = &hsotg->eps[0]; |
| int ret = 0; |
| u32 dcfg; |
| |
| ep0->sent_zlp = 0; |
| |
| dev_dbg(hsotg->dev, "ctrl Req=%02x, Type=%02x, V=%04x, L=%04x\n", |
| ctrl->bRequest, ctrl->bRequestType, |
| ctrl->wValue, ctrl->wLength); |
| |
| /* |
| * record the direction of the request, for later use when enquing |
| * packets onto EP0. |
| */ |
| |
| ep0->dir_in = (ctrl->bRequestType & USB_DIR_IN) ? 1 : 0; |
| dev_dbg(hsotg->dev, "ctrl: dir_in=%d\n", ep0->dir_in); |
| |
| /* |
| * if we've no data with this request, then the last part of the |
| * transaction is going to implicitly be IN. |
| */ |
| if (ctrl->wLength == 0) |
| ep0->dir_in = 1; |
| |
| if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) { |
| switch (ctrl->bRequest) { |
| case USB_REQ_SET_ADDRESS: |
| dcfg = readl(hsotg->regs + DCFG); |
| dcfg &= ~DCFG_DevAddr_MASK; |
| dcfg |= ctrl->wValue << DCFG_DevAddr_SHIFT; |
| writel(dcfg, hsotg->regs + DCFG); |
| |
| dev_info(hsotg->dev, "new address %d\n", ctrl->wValue); |
| |
| ret = s3c_hsotg_send_reply(hsotg, ep0, NULL, 0); |
| return; |
| |
| case USB_REQ_GET_STATUS: |
| ret = s3c_hsotg_process_req_status(hsotg, ctrl); |
| break; |
| |
| case USB_REQ_CLEAR_FEATURE: |
| case USB_REQ_SET_FEATURE: |
| ret = s3c_hsotg_process_req_feature(hsotg, ctrl); |
| break; |
| } |
| } |
| |
| /* as a fallback, try delivering it to the driver to deal with */ |
| |
| if (ret == 0 && hsotg->driver) { |
| ret = hsotg->driver->setup(&hsotg->gadget, ctrl); |
| if (ret < 0) |
| dev_dbg(hsotg->dev, "driver->setup() ret %d\n", ret); |
| } |
| |
| /* |
| * the request is either unhandlable, or is not formatted correctly |
| * so respond with a STALL for the status stage to indicate failure. |
| */ |
| |
| if (ret < 0) { |
| u32 reg; |
| u32 ctrl; |
| |
| dev_dbg(hsotg->dev, "ep0 stall (dir=%d)\n", ep0->dir_in); |
| reg = (ep0->dir_in) ? DIEPCTL0 : DOEPCTL0; |
| |
| /* |
| * DxEPCTL_Stall will be cleared by EP once it has |
| * taken effect, so no need to clear later. |
| */ |
| |
| ctrl = readl(hsotg->regs + reg); |
| ctrl |= DxEPCTL_Stall; |
| ctrl |= DxEPCTL_CNAK; |
| writel(ctrl, hsotg->regs + reg); |
| |
| dev_dbg(hsotg->dev, |
| "written DxEPCTL=0x%08x to %08x (DxEPCTL=0x%08x)\n", |
| ctrl, reg, readl(hsotg->regs + reg)); |
| |
| /* |
| * don't believe we need to anything more to get the EP |
| * to reply with a STALL packet |
| */ |
| } |
| } |
| |
| static void s3c_hsotg_enqueue_setup(struct s3c_hsotg *hsotg); |
| |
| /** |
| * s3c_hsotg_complete_setup - completion of a setup transfer |
| * @ep: The endpoint the request was on. |
| * @req: The request completed. |
| * |
| * Called on completion of any requests the driver itself submitted for |
| * EP0 setup packets |
| */ |
| static void s3c_hsotg_complete_setup(struct usb_ep *ep, |
| struct usb_request *req) |
| { |
| struct s3c_hsotg_ep *hs_ep = our_ep(ep); |
| struct s3c_hsotg *hsotg = hs_ep->parent; |
| |
| if (req->status < 0) { |
| dev_dbg(hsotg->dev, "%s: failed %d\n", __func__, req->status); |
| return; |
| } |
| |
| if (req->actual == 0) |
| s3c_hsotg_enqueue_setup(hsotg); |
| else |
| s3c_hsotg_process_control(hsotg, req->buf); |
| } |
| |
| /** |
| * s3c_hsotg_enqueue_setup - start a request for EP0 packets |
| * @hsotg: The device state. |
| * |
| * Enqueue a request on EP0 if necessary to received any SETUP packets |
| * received from the host. |
| */ |
| static void s3c_hsotg_enqueue_setup(struct s3c_hsotg *hsotg) |
| { |
| struct usb_request *req = hsotg->ctrl_req; |
| struct s3c_hsotg_req *hs_req = our_req(req); |
| int ret; |
| |
| dev_dbg(hsotg->dev, "%s: queueing setup request\n", __func__); |
| |
| req->zero = 0; |
| req->length = 8; |
| req->buf = hsotg->ctrl_buff; |
| req->complete = s3c_hsotg_complete_setup; |
| |
| if (!list_empty(&hs_req->queue)) { |
| dev_dbg(hsotg->dev, "%s already queued???\n", __func__); |
| return; |
| } |
| |
| hsotg->eps[0].dir_in = 0; |
| |
| ret = s3c_hsotg_ep_queue(&hsotg->eps[0].ep, req, GFP_ATOMIC); |
| if (ret < 0) { |
| dev_err(hsotg->dev, "%s: failed queue (%d)\n", __func__, ret); |
| /* |
| * Don't think there's much we can do other than watch the |
| * driver fail. |
| */ |
| } |
| } |
| |
| /** |
| * s3c_hsotg_complete_request - complete a request given to us |
| * @hsotg: The device state. |
| * @hs_ep: The endpoint the request was on. |
| * @hs_req: The request to complete. |
| * @result: The result code (0 => Ok, otherwise errno) |
| * |
| * The given request has finished, so call the necessary completion |
| * if it has one and then look to see if we can start a new request |
| * on the endpoint. |
| * |
| * Note, expects the ep to already be locked as appropriate. |
| */ |
| static void s3c_hsotg_complete_request(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *hs_ep, |
| struct s3c_hsotg_req *hs_req, |
| int result) |
| { |
| bool restart; |
| |
| if (!hs_req) { |
| dev_dbg(hsotg->dev, "%s: nothing to complete?\n", __func__); |
| return; |
| } |
| |
| dev_dbg(hsotg->dev, "complete: ep %p %s, req %p, %d => %p\n", |
| hs_ep, hs_ep->ep.name, hs_req, result, hs_req->req.complete); |
| |
| /* |
| * only replace the status if we've not already set an error |
| * from a previous transaction |
| */ |
| |
| if (hs_req->req.status == -EINPROGRESS) |
| hs_req->req.status = result; |
| |
| hs_ep->req = NULL; |
| list_del_init(&hs_req->queue); |
| |
| if (using_dma(hsotg)) |
| s3c_hsotg_unmap_dma(hsotg, hs_ep, hs_req); |
| |
| /* |
| * call the complete request with the locks off, just in case the |
| * request tries to queue more work for this endpoint. |
| */ |
| |
| if (hs_req->req.complete) { |
| spin_unlock(&hsotg->lock); |
| hs_req->req.complete(&hs_ep->ep, &hs_req->req); |
| spin_lock(&hsotg->lock); |
| } |
| |
| /* |
| * Look to see if there is anything else to do. Note, the completion |
| * of the previous request may have caused a new request to be started |
| * so be careful when doing this. |
| */ |
| |
| if (!hs_ep->req && result >= 0) { |
| restart = !list_empty(&hs_ep->queue); |
| if (restart) { |
| hs_req = get_ep_head(hs_ep); |
| s3c_hsotg_start_req(hsotg, hs_ep, hs_req, false); |
| } |
| } |
| } |
| |
| /** |
| * s3c_hsotg_rx_data - receive data from the FIFO for an endpoint |
| * @hsotg: The device state. |
| * @ep_idx: The endpoint index for the data |
| * @size: The size of data in the fifo, in bytes |
| * |
| * The FIFO status shows there is data to read from the FIFO for a given |
| * endpoint, so sort out whether we need to read the data into a request |
| * that has been made for that endpoint. |
| */ |
| static void s3c_hsotg_rx_data(struct s3c_hsotg *hsotg, int ep_idx, int size) |
| { |
| struct s3c_hsotg_ep *hs_ep = &hsotg->eps[ep_idx]; |
| struct s3c_hsotg_req *hs_req = hs_ep->req; |
| void __iomem *fifo = hsotg->regs + EPFIFO(ep_idx); |
| int to_read; |
| int max_req; |
| int read_ptr; |
| |
| |
| if (!hs_req) { |
| u32 epctl = readl(hsotg->regs + DOEPCTL(ep_idx)); |
| int ptr; |
| |
| dev_warn(hsotg->dev, |
| "%s: FIFO %d bytes on ep%d but no req (DxEPCTl=0x%08x)\n", |
| __func__, size, ep_idx, epctl); |
| |
| /* dump the data from the FIFO, we've nothing we can do */ |
| for (ptr = 0; ptr < size; ptr += 4) |
| (void)readl(fifo); |
| |
| return; |
| } |
| |
| to_read = size; |
| read_ptr = hs_req->req.actual; |
| max_req = hs_req->req.length - read_ptr; |
| |
| dev_dbg(hsotg->dev, "%s: read %d/%d, done %d/%d\n", |
| __func__, to_read, max_req, read_ptr, hs_req->req.length); |
| |
| if (to_read > max_req) { |
| /* |
| * more data appeared than we where willing |
| * to deal with in this request. |
| */ |
| |
| /* currently we don't deal this */ |
| WARN_ON_ONCE(1); |
| } |
| |
| hs_ep->total_data += to_read; |
| hs_req->req.actual += to_read; |
| to_read = DIV_ROUND_UP(to_read, 4); |
| |
| /* |
| * note, we might over-write the buffer end by 3 bytes depending on |
| * alignment of the data. |
| */ |
| readsl(fifo, hs_req->req.buf + read_ptr, to_read); |
| } |
| |
| /** |
| * s3c_hsotg_send_zlp - send zero-length packet on control endpoint |
| * @hsotg: The device instance |
| * @req: The request currently on this endpoint |
| * |
| * Generate a zero-length IN packet request for terminating a SETUP |
| * transaction. |
| * |
| * Note, since we don't write any data to the TxFIFO, then it is |
| * currently believed that we do not need to wait for any space in |
| * the TxFIFO. |
| */ |
| static void s3c_hsotg_send_zlp(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_req *req) |
| { |
| u32 ctrl; |
| |
| if (!req) { |
| dev_warn(hsotg->dev, "%s: no request?\n", __func__); |
| return; |
| } |
| |
| if (req->req.length == 0) { |
| hsotg->eps[0].sent_zlp = 1; |
| s3c_hsotg_enqueue_setup(hsotg); |
| return; |
| } |
| |
| hsotg->eps[0].dir_in = 1; |
| hsotg->eps[0].sent_zlp = 1; |
| |
| dev_dbg(hsotg->dev, "sending zero-length packet\n"); |
| |
| /* issue a zero-sized packet to terminate this */ |
| writel(DxEPTSIZ_MC(1) | DxEPTSIZ_PktCnt(1) | |
| DxEPTSIZ_XferSize(0), hsotg->regs + DIEPTSIZ(0)); |
| |
| ctrl = readl(hsotg->regs + DIEPCTL0); |
| ctrl |= DxEPCTL_CNAK; /* clear NAK set by core */ |
| ctrl |= DxEPCTL_EPEna; /* ensure ep enabled */ |
| ctrl |= DxEPCTL_USBActEp; |
| writel(ctrl, hsotg->regs + DIEPCTL0); |
| } |
| |
| /** |
| * s3c_hsotg_handle_outdone - handle receiving OutDone/SetupDone from RXFIFO |
| * @hsotg: The device instance |
| * @epnum: The endpoint received from |
| * @was_setup: Set if processing a SetupDone event. |
| * |
| * The RXFIFO has delivered an OutDone event, which means that the data |
| * transfer for an OUT endpoint has been completed, either by a short |
| * packet or by the finish of a transfer. |
| */ |
| static void s3c_hsotg_handle_outdone(struct s3c_hsotg *hsotg, |
| int epnum, bool was_setup) |
| { |
| u32 epsize = readl(hsotg->regs + DOEPTSIZ(epnum)); |
| struct s3c_hsotg_ep *hs_ep = &hsotg->eps[epnum]; |
| struct s3c_hsotg_req *hs_req = hs_ep->req; |
| struct usb_request *req = &hs_req->req; |
| unsigned size_left = DxEPTSIZ_XferSize_GET(epsize); |
| int result = 0; |
| |
| if (!hs_req) { |
| dev_dbg(hsotg->dev, "%s: no request active\n", __func__); |
| return; |
| } |
| |
| if (using_dma(hsotg)) { |
| unsigned size_done; |
| |
| /* |
| * Calculate the size of the transfer by checking how much |
| * is left in the endpoint size register and then working it |
| * out from the amount we loaded for the transfer. |
| * |
| * We need to do this as DMA pointers are always 32bit aligned |
| * so may overshoot/undershoot the transfer. |
| */ |
| |
| size_done = hs_ep->size_loaded - size_left; |
| size_done += hs_ep->last_load; |
| |
| req->actual = size_done; |
| } |
| |
| /* if there is more request to do, schedule new transfer */ |
| if (req->actual < req->length && size_left == 0) { |
| s3c_hsotg_start_req(hsotg, hs_ep, hs_req, true); |
| return; |
| } else if (epnum == 0) { |
| /* |
| * After was_setup = 1 => |
| * set CNAK for non Setup requests |
| */ |
| hsotg->setup = was_setup ? 0 : 1; |
| } |
| |
| if (req->actual < req->length && req->short_not_ok) { |
| dev_dbg(hsotg->dev, "%s: got %d/%d (short not ok) => error\n", |
| __func__, req->actual, req->length); |
| |
| /* |
| * todo - what should we return here? there's no one else |
| * even bothering to check the status. |
| */ |
| } |
| |
| if (epnum == 0) { |
| /* |
| * Condition req->complete != s3c_hsotg_complete_setup says: |
| * send ZLP when we have an asynchronous request from gadget |
| */ |
| if (!was_setup && req->complete != s3c_hsotg_complete_setup) |
| s3c_hsotg_send_zlp(hsotg, hs_req); |
| } |
| |
| s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, result); |
| } |
| |
| /** |
| * s3c_hsotg_read_frameno - read current frame number |
| * @hsotg: The device instance |
| * |
| * Return the current frame number |
| */ |
| static u32 s3c_hsotg_read_frameno(struct s3c_hsotg *hsotg) |
| { |
| u32 dsts; |
| |
| dsts = readl(hsotg->regs + DSTS); |
| dsts &= DSTS_SOFFN_MASK; |
| dsts >>= DSTS_SOFFN_SHIFT; |
| |
| return dsts; |
| } |
| |
| /** |
| * s3c_hsotg_handle_rx - RX FIFO has data |
| * @hsotg: The device instance |
| * |
| * The IRQ handler has detected that the RX FIFO has some data in it |
| * that requires processing, so find out what is in there and do the |
| * appropriate read. |
| * |
| * The RXFIFO is a true FIFO, the packets coming out are still in packet |
| * chunks, so if you have x packets received on an endpoint you'll get x |
| * FIFO events delivered, each with a packet's worth of data in it. |
| * |
| * When using DMA, we should not be processing events from the RXFIFO |
| * as the actual data should be sent to the memory directly and we turn |
| * on the completion interrupts to get notifications of transfer completion. |
| */ |
| static void s3c_hsotg_handle_rx(struct s3c_hsotg *hsotg) |
| { |
| u32 grxstsr = readl(hsotg->regs + GRXSTSP); |
| u32 epnum, status, size; |
| |
| WARN_ON(using_dma(hsotg)); |
| |
| epnum = grxstsr & GRXSTS_EPNum_MASK; |
| status = grxstsr & GRXSTS_PktSts_MASK; |
| |
| size = grxstsr & GRXSTS_ByteCnt_MASK; |
| size >>= GRXSTS_ByteCnt_SHIFT; |
| |
| if (1) |
| dev_dbg(hsotg->dev, "%s: GRXSTSP=0x%08x (%d@%d)\n", |
| __func__, grxstsr, size, epnum); |
| |
| #define __status(x) ((x) >> GRXSTS_PktSts_SHIFT) |
| |
| switch (status >> GRXSTS_PktSts_SHIFT) { |
| case __status(GRXSTS_PktSts_GlobalOutNAK): |
| dev_dbg(hsotg->dev, "GlobalOutNAK\n"); |
| break; |
| |
| case __status(GRXSTS_PktSts_OutDone): |
| dev_dbg(hsotg->dev, "OutDone (Frame=0x%08x)\n", |
| s3c_hsotg_read_frameno(hsotg)); |
| |
| if (!using_dma(hsotg)) |
| s3c_hsotg_handle_outdone(hsotg, epnum, false); |
| break; |
| |
| case __status(GRXSTS_PktSts_SetupDone): |
| dev_dbg(hsotg->dev, |
| "SetupDone (Frame=0x%08x, DOPEPCTL=0x%08x)\n", |
| s3c_hsotg_read_frameno(hsotg), |
| readl(hsotg->regs + DOEPCTL(0))); |
| |
| s3c_hsotg_handle_outdone(hsotg, epnum, true); |
| break; |
| |
| case __status(GRXSTS_PktSts_OutRX): |
| s3c_hsotg_rx_data(hsotg, epnum, size); |
| break; |
| |
| case __status(GRXSTS_PktSts_SetupRX): |
| dev_dbg(hsotg->dev, |
| "SetupRX (Frame=0x%08x, DOPEPCTL=0x%08x)\n", |
| s3c_hsotg_read_frameno(hsotg), |
| readl(hsotg->regs + DOEPCTL(0))); |
| |
| s3c_hsotg_rx_data(hsotg, epnum, size); |
| break; |
| |
| default: |
| dev_warn(hsotg->dev, "%s: unknown status %08x\n", |
| __func__, grxstsr); |
| |
| s3c_hsotg_dump(hsotg); |
| break; |
| } |
| } |
| |
| /** |
| * s3c_hsotg_ep0_mps - turn max packet size into register setting |
| * @mps: The maximum packet size in bytes. |
| */ |
| static u32 s3c_hsotg_ep0_mps(unsigned int mps) |
| { |
| switch (mps) { |
| case 64: |
| return D0EPCTL_MPS_64; |
| case 32: |
| return D0EPCTL_MPS_32; |
| case 16: |
| return D0EPCTL_MPS_16; |
| case 8: |
| return D0EPCTL_MPS_8; |
| } |
| |
| /* bad max packet size, warn and return invalid result */ |
| WARN_ON(1); |
| return (u32)-1; |
| } |
| |
| /** |
| * s3c_hsotg_set_ep_maxpacket - set endpoint's max-packet field |
| * @hsotg: The driver state. |
| * @ep: The index number of the endpoint |
| * @mps: The maximum packet size in bytes |
| * |
| * Configure the maximum packet size for the given endpoint, updating |
| * the hardware control registers to reflect this. |
| */ |
| static void s3c_hsotg_set_ep_maxpacket(struct s3c_hsotg *hsotg, |
| unsigned int ep, unsigned int mps) |
| { |
| struct s3c_hsotg_ep *hs_ep = &hsotg->eps[ep]; |
| void __iomem *regs = hsotg->regs; |
| u32 mpsval; |
| u32 reg; |
| |
| if (ep == 0) { |
| /* EP0 is a special case */ |
| mpsval = s3c_hsotg_ep0_mps(mps); |
| if (mpsval > 3) |
| goto bad_mps; |
| } else { |
| if (mps >= DxEPCTL_MPS_LIMIT+1) |
| goto bad_mps; |
| |
| mpsval = mps; |
| } |
| |
| hs_ep->ep.maxpacket = mps; |
| |
| /* |
| * update both the in and out endpoint controldir_ registers, even |
| * if one of the directions may not be in use. |
| */ |
| |
| reg = readl(regs + DIEPCTL(ep)); |
| reg &= ~DxEPCTL_MPS_MASK; |
| reg |= mpsval; |
| writel(reg, regs + DIEPCTL(ep)); |
| |
| if (ep) { |
| reg = readl(regs + DOEPCTL(ep)); |
| reg &= ~DxEPCTL_MPS_MASK; |
| reg |= mpsval; |
| writel(reg, regs + DOEPCTL(ep)); |
| } |
| |
| return; |
| |
| bad_mps: |
| dev_err(hsotg->dev, "ep%d: bad mps of %d\n", ep, mps); |
| } |
| |
| /** |
| * s3c_hsotg_txfifo_flush - flush Tx FIFO |
| * @hsotg: The driver state |
| * @idx: The index for the endpoint (0..15) |
| */ |
| static void s3c_hsotg_txfifo_flush(struct s3c_hsotg *hsotg, unsigned int idx) |
| { |
| int timeout; |
| int val; |
| |
| writel(GRSTCTL_TxFNum(idx) | GRSTCTL_TxFFlsh, |
| hsotg->regs + GRSTCTL); |
| |
| /* wait until the fifo is flushed */ |
| timeout = 100; |
| |
| while (1) { |
| val = readl(hsotg->regs + GRSTCTL); |
| |
| if ((val & (GRSTCTL_TxFFlsh)) == 0) |
| break; |
| |
| if (--timeout == 0) { |
| dev_err(hsotg->dev, |
| "%s: timeout flushing fifo (GRSTCTL=%08x)\n", |
| __func__, val); |
| } |
| |
| udelay(1); |
| } |
| } |
| |
| /** |
| * s3c_hsotg_trytx - check to see if anything needs transmitting |
| * @hsotg: The driver state |
| * @hs_ep: The driver endpoint to check. |
| * |
| * Check to see if there is a request that has data to send, and if so |
| * make an attempt to write data into the FIFO. |
| */ |
| static int s3c_hsotg_trytx(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *hs_ep) |
| { |
| struct s3c_hsotg_req *hs_req = hs_ep->req; |
| |
| if (!hs_ep->dir_in || !hs_req) |
| return 0; |
| |
| if (hs_req->req.actual < hs_req->req.length) { |
| dev_dbg(hsotg->dev, "trying to write more for ep%d\n", |
| hs_ep->index); |
| return s3c_hsotg_write_fifo(hsotg, hs_ep, hs_req); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * s3c_hsotg_complete_in - complete IN transfer |
| * @hsotg: The device state. |
| * @hs_ep: The endpoint that has just completed. |
| * |
| * An IN transfer has been completed, update the transfer's state and then |
| * call the relevant completion routines. |
| */ |
| static void s3c_hsotg_complete_in(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *hs_ep) |
| { |
| struct s3c_hsotg_req *hs_req = hs_ep->req; |
| u32 epsize = readl(hsotg->regs + DIEPTSIZ(hs_ep->index)); |
| int size_left, size_done; |
| |
| if (!hs_req) { |
| dev_dbg(hsotg->dev, "XferCompl but no req\n"); |
| return; |
| } |
| |
| /* Finish ZLP handling for IN EP0 transactions */ |
| if (hsotg->eps[0].sent_zlp) { |
| dev_dbg(hsotg->dev, "zlp packet received\n"); |
| s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, 0); |
| return; |
| } |
| |
| /* |
| * Calculate the size of the transfer by checking how much is left |
| * in the endpoint size register and then working it out from |
| * the amount we loaded for the transfer. |
| * |
| * We do this even for DMA, as the transfer may have incremented |
| * past the end of the buffer (DMA transfers are always 32bit |
| * aligned). |
| */ |
| |
| size_left = DxEPTSIZ_XferSize_GET(epsize); |
| |
| size_done = hs_ep->size_loaded - size_left; |
| size_done += hs_ep->last_load; |
| |
| if (hs_req->req.actual != size_done) |
| dev_dbg(hsotg->dev, "%s: adjusting size done %d => %d\n", |
| __func__, hs_req->req.actual, size_done); |
| |
| hs_req->req.actual = size_done; |
| dev_dbg(hsotg->dev, "req->length:%d req->actual:%d req->zero:%d\n", |
| hs_req->req.length, hs_req->req.actual, hs_req->req.zero); |
| |
| /* |
| * Check if dealing with Maximum Packet Size(MPS) IN transfer at EP0 |
| * When sent data is a multiple MPS size (e.g. 64B ,128B ,192B |
| * ,256B ... ), after last MPS sized packet send IN ZLP packet to |
| * inform the host that no more data is available. |
| * The state of req.zero member is checked to be sure that the value to |
| * send is smaller than wValue expected from host. |
| * Check req.length to NOT send another ZLP when the current one is |
| * under completion (the one for which this completion has been called). |
| */ |
| if (hs_req->req.length && hs_ep->index == 0 && hs_req->req.zero && |
| hs_req->req.length == hs_req->req.actual && |
| !(hs_req->req.length % hs_ep->ep.maxpacket)) { |
| |
| dev_dbg(hsotg->dev, "ep0 zlp IN packet sent\n"); |
| s3c_hsotg_send_zlp(hsotg, hs_req); |
| |
| return; |
| } |
| |
| if (!size_left && hs_req->req.actual < hs_req->req.length) { |
| dev_dbg(hsotg->dev, "%s trying more for req...\n", __func__); |
| s3c_hsotg_start_req(hsotg, hs_ep, hs_req, true); |
| } else |
| s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, 0); |
| } |
| |
| /** |
| * s3c_hsotg_epint - handle an in/out endpoint interrupt |
| * @hsotg: The driver state |
| * @idx: The index for the endpoint (0..15) |
| * @dir_in: Set if this is an IN endpoint |
| * |
| * Process and clear any interrupt pending for an individual endpoint |
| */ |
| static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx, |
| int dir_in) |
| { |
| struct s3c_hsotg_ep *hs_ep = &hsotg->eps[idx]; |
| u32 epint_reg = dir_in ? DIEPINT(idx) : DOEPINT(idx); |
| u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx); |
| u32 epsiz_reg = dir_in ? DIEPTSIZ(idx) : DOEPTSIZ(idx); |
| u32 ints; |
| |
| ints = readl(hsotg->regs + epint_reg); |
| |
| /* Clear endpoint interrupts */ |
| writel(ints, hsotg->regs + epint_reg); |
| |
| dev_dbg(hsotg->dev, "%s: ep%d(%s) DxEPINT=0x%08x\n", |
| __func__, idx, dir_in ? "in" : "out", ints); |
| |
| if (ints & DxEPINT_XferCompl) { |
| dev_dbg(hsotg->dev, |
| "%s: XferCompl: DxEPCTL=0x%08x, DxEPTSIZ=%08x\n", |
| __func__, readl(hsotg->regs + epctl_reg), |
| readl(hsotg->regs + epsiz_reg)); |
| |
| /* |
| * we get OutDone from the FIFO, so we only need to look |
| * at completing IN requests here |
| */ |
| if (dir_in) { |
| s3c_hsotg_complete_in(hsotg, hs_ep); |
| |
| if (idx == 0 && !hs_ep->req) |
| s3c_hsotg_enqueue_setup(hsotg); |
| } else if (using_dma(hsotg)) { |
| /* |
| * We're using DMA, we need to fire an OutDone here |
| * as we ignore the RXFIFO. |
| */ |
| |
| s3c_hsotg_handle_outdone(hsotg, idx, false); |
| } |
| } |
| |
| if (ints & DxEPINT_EPDisbld) { |
| dev_dbg(hsotg->dev, "%s: EPDisbld\n", __func__); |
| |
| if (dir_in) { |
| int epctl = readl(hsotg->regs + epctl_reg); |
| |
| s3c_hsotg_txfifo_flush(hsotg, idx); |
| |
| if ((epctl & DxEPCTL_Stall) && |
| (epctl & DxEPCTL_EPType_Bulk)) { |
| int dctl = readl(hsotg->regs + DCTL); |
| |
| dctl |= DCTL_CGNPInNAK; |
| writel(dctl, hsotg->regs + DCTL); |
| } |
| } |
| } |
| |
| if (ints & DxEPINT_AHBErr) |
| dev_dbg(hsotg->dev, "%s: AHBErr\n", __func__); |
| |
| if (ints & DxEPINT_Setup) { /* Setup or Timeout */ |
| dev_dbg(hsotg->dev, "%s: Setup/Timeout\n", __func__); |
| |
| if (using_dma(hsotg) && idx == 0) { |
| /* |
| * this is the notification we've received a |
| * setup packet. In non-DMA mode we'd get this |
| * from the RXFIFO, instead we need to process |
| * the setup here. |
| */ |
| |
| if (dir_in) |
| WARN_ON_ONCE(1); |
| else |
| s3c_hsotg_handle_outdone(hsotg, 0, true); |
| } |
| } |
| |
| if (ints & DxEPINT_Back2BackSetup) |
| dev_dbg(hsotg->dev, "%s: B2BSetup/INEPNakEff\n", __func__); |
| |
| if (dir_in) { |
| /* not sure if this is important, but we'll clear it anyway */ |
| if (ints & DIEPMSK_INTknTXFEmpMsk) { |
| dev_dbg(hsotg->dev, "%s: ep%d: INTknTXFEmpMsk\n", |
| __func__, idx); |
| } |
| |
| /* this probably means something bad is happening */ |
| if (ints & DIEPMSK_INTknEPMisMsk) { |
| dev_warn(hsotg->dev, "%s: ep%d: INTknEP\n", |
| __func__, idx); |
| } |
| |
| /* FIFO has space or is empty (see GAHBCFG) */ |
| if (hsotg->dedicated_fifos && |
| ints & DIEPMSK_TxFIFOEmpty) { |
| dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n", |
| __func__, idx); |
| if (!using_dma(hsotg)) |
| s3c_hsotg_trytx(hsotg, hs_ep); |
| } |
| } |
| } |
| |
| /** |
| * s3c_hsotg_irq_enumdone - Handle EnumDone interrupt (enumeration done) |
| * @hsotg: The device state. |
| * |
| * Handle updating the device settings after the enumeration phase has |
| * been completed. |
| */ |
| static void s3c_hsotg_irq_enumdone(struct s3c_hsotg *hsotg) |
| { |
| u32 dsts = readl(hsotg->regs + DSTS); |
| int ep0_mps = 0, ep_mps; |
| |
| /* |
| * This should signal the finish of the enumeration phase |
| * of the USB handshaking, so we should now know what rate |
| * we connected at. |
| */ |
| |
| dev_dbg(hsotg->dev, "EnumDone (DSTS=0x%08x)\n", dsts); |
| |
| /* |
| * note, since we're limited by the size of transfer on EP0, and |
| * it seems IN transfers must be a even number of packets we do |
| * not advertise a 64byte MPS on EP0. |
| */ |
| |
| /* catch both EnumSpd_FS and EnumSpd_FS48 */ |
| switch (dsts & DSTS_EnumSpd_MASK) { |
| case DSTS_EnumSpd_FS: |
| case DSTS_EnumSpd_FS48: |
| hsotg->gadget.speed = USB_SPEED_FULL; |
| ep0_mps = EP0_MPS_LIMIT; |
| ep_mps = 64; |
| break; |
| |
| case DSTS_EnumSpd_HS: |
| hsotg->gadget.speed = USB_SPEED_HIGH; |
| ep0_mps = EP0_MPS_LIMIT; |
| ep_mps = 512; |
| break; |
| |
| case DSTS_EnumSpd_LS: |
| hsotg->gadget.speed = USB_SPEED_LOW; |
| /* |
| * note, we don't actually support LS in this driver at the |
| * moment, and the documentation seems to imply that it isn't |
| * supported by the PHYs on some of the devices. |
| */ |
| break; |
| } |
| dev_info(hsotg->dev, "new device is %s\n", |
| usb_speed_string(hsotg->gadget.speed)); |
| |
| /* |
| * we should now know the maximum packet size for an |
| * endpoint, so set the endpoints to a default value. |
| */ |
| |
| if (ep0_mps) { |
| int i; |
| s3c_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps); |
| for (i = 1; i < hsotg->num_of_eps; i++) |
| s3c_hsotg_set_ep_maxpacket(hsotg, i, ep_mps); |
| } |
| |
| /* ensure after enumeration our EP0 is active */ |
| |
| s3c_hsotg_enqueue_setup(hsotg); |
| |
| dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", |
| readl(hsotg->regs + DIEPCTL0), |
| readl(hsotg->regs + DOEPCTL0)); |
| } |
| |
| /** |
| * kill_all_requests - remove all requests from the endpoint's queue |
| * @hsotg: The device state. |
| * @ep: The endpoint the requests may be on. |
| * @result: The result code to use. |
| * @force: Force removal of any current requests |
| * |
| * Go through the requests on the given endpoint and mark them |
| * completed with the given result code. |
| */ |
| static void kill_all_requests(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *ep, |
| int result, bool force) |
| { |
| struct s3c_hsotg_req *req, *treq; |
| |
| list_for_each_entry_safe(req, treq, &ep->queue, queue) { |
| /* |
| * currently, we can't do much about an already |
| * running request on an in endpoint |
| */ |
| |
| if (ep->req == req && ep->dir_in && !force) |
| continue; |
| |
| s3c_hsotg_complete_request(hsotg, ep, req, |
| result); |
| } |
| } |
| |
| #define call_gadget(_hs, _entry) \ |
| if ((_hs)->gadget.speed != USB_SPEED_UNKNOWN && \ |
| (_hs)->driver && (_hs)->driver->_entry) { \ |
| spin_unlock(&_hs->lock); \ |
| (_hs)->driver->_entry(&(_hs)->gadget); \ |
| spin_lock(&_hs->lock); \ |
| } |
| |
| /** |
| * s3c_hsotg_disconnect - disconnect service |
| * @hsotg: The device state. |
| * |
| * The device has been disconnected. Remove all current |
| * transactions and signal the gadget driver that this |
| * has happened. |
| */ |
| static void s3c_hsotg_disconnect(struct s3c_hsotg *hsotg) |
| { |
| unsigned ep; |
| |
| for (ep = 0; ep < hsotg->num_of_eps; ep++) |
| kill_all_requests(hsotg, &hsotg->eps[ep], -ESHUTDOWN, true); |
| |
| call_gadget(hsotg, disconnect); |
| } |
| |
| /** |
| * s3c_hsotg_irq_fifoempty - TX FIFO empty interrupt handler |
| * @hsotg: The device state: |
| * @periodic: True if this is a periodic FIFO interrupt |
| */ |
| static void s3c_hsotg_irq_fifoempty(struct s3c_hsotg *hsotg, bool periodic) |
| { |
| struct s3c_hsotg_ep *ep; |
| int epno, ret; |
| |
| /* look through for any more data to transmit */ |
| |
| for (epno = 0; epno < hsotg->num_of_eps; epno++) { |
| ep = &hsotg->eps[epno]; |
| |
| if (!ep->dir_in) |
| continue; |
| |
| if ((periodic && !ep->periodic) || |
| (!periodic && ep->periodic)) |
| continue; |
| |
| ret = s3c_hsotg_trytx(hsotg, ep); |
| if (ret < 0) |
| break; |
| } |
| } |
| |
| /* IRQ flags which will trigger a retry around the IRQ loop */ |
| #define IRQ_RETRY_MASK (GINTSTS_NPTxFEmp | \ |
| GINTSTS_PTxFEmp | \ |
| GINTSTS_RxFLvl) |
| |
| /** |
| * s3c_hsotg_corereset - issue softreset to the core |
| * @hsotg: The device state |
| * |
| * Issue a soft reset to the core, and await the core finishing it. |
| */ |
| static int s3c_hsotg_corereset(struct s3c_hsotg *hsotg) |
| { |
| int timeout; |
| u32 grstctl; |
| |
| dev_dbg(hsotg->dev, "resetting core\n"); |
| |
| /* issue soft reset */ |
| writel(GRSTCTL_CSftRst, hsotg->regs + GRSTCTL); |
| |
| timeout = 1000; |
| do { |
| grstctl = readl(hsotg->regs + GRSTCTL); |
| } while ((grstctl & GRSTCTL_CSftRst) && timeout-- > 0); |
| |
| if (grstctl & GRSTCTL_CSftRst) { |
| dev_err(hsotg->dev, "Failed to get CSftRst asserted\n"); |
| return -EINVAL; |
| } |
| |
| timeout = 1000; |
| |
| while (1) { |
| u32 grstctl = readl(hsotg->regs + GRSTCTL); |
| |
| if (timeout-- < 0) { |
| dev_info(hsotg->dev, |
| "%s: reset failed, GRSTCTL=%08x\n", |
| __func__, grstctl); |
| return -ETIMEDOUT; |
| } |
| |
| if (!(grstctl & GRSTCTL_AHBIdle)) |
| continue; |
| |
| break; /* reset done */ |
| } |
| |
| dev_dbg(hsotg->dev, "reset successful\n"); |
| return 0; |
| } |
| |
| /** |
| * s3c_hsotg_core_init - issue softreset to the core |
| * @hsotg: The device state |
| * |
| * Issue a soft reset to the core, and await the core finishing it. |
| */ |
| static void s3c_hsotg_core_init(struct s3c_hsotg *hsotg) |
| { |
| s3c_hsotg_corereset(hsotg); |
| |
| /* |
| * we must now enable ep0 ready for host detection and then |
| * set configuration. |
| */ |
| |
| /* set the PLL on, remove the HNP/SRP and set the PHY */ |
| writel(GUSBCFG_PHYIf16 | GUSBCFG_TOutCal(7) | |
| (0x5 << 10), hsotg->regs + GUSBCFG); |
| |
| s3c_hsotg_init_fifo(hsotg); |
| |
| __orr32(hsotg->regs + DCTL, DCTL_SftDiscon); |
| |
| writel(1 << 18 | DCFG_DevSpd_HS, hsotg->regs + DCFG); |
| |
| /* Clear any pending OTG interrupts */ |
| writel(0xffffffff, hsotg->regs + GOTGINT); |
| |
| /* Clear any pending interrupts */ |
| writel(0xffffffff, hsotg->regs + GINTSTS); |
| |
| writel(GINTSTS_ErlySusp | GINTSTS_SessReqInt | |
| GINTSTS_GOUTNakEff | GINTSTS_GINNakEff | |
| GINTSTS_ConIDStsChng | GINTSTS_USBRst | |
| GINTSTS_EnumDone | GINTSTS_OTGInt | |
| GINTSTS_USBSusp | GINTSTS_WkUpInt, |
| hsotg->regs + GINTMSK); |
| |
| if (using_dma(hsotg)) |
| writel(GAHBCFG_GlblIntrEn | GAHBCFG_DMAEn | |
| GAHBCFG_HBstLen_Incr4, |
| hsotg->regs + GAHBCFG); |
| else |
| writel(GAHBCFG_GlblIntrEn, hsotg->regs + GAHBCFG); |
| |
| /* |
| * Enabling INTknTXFEmpMsk here seems to be a big mistake, we end |
| * up being flooded with interrupts if the host is polling the |
| * endpoint to try and read data. |
| */ |
| |
| writel(((hsotg->dedicated_fifos) ? DIEPMSK_TxFIFOEmpty : 0) | |
| DIEPMSK_EPDisbldMsk | DIEPMSK_XferComplMsk | |
| DIEPMSK_TimeOUTMsk | DIEPMSK_AHBErrMsk | |
| DIEPMSK_INTknEPMisMsk, |
| hsotg->regs + DIEPMSK); |
| |
| /* |
| * don't need XferCompl, we get that from RXFIFO in slave mode. In |
| * DMA mode we may need this. |
| */ |
| writel((using_dma(hsotg) ? (DIEPMSK_XferComplMsk | |
| DIEPMSK_TimeOUTMsk) : 0) | |
| DOEPMSK_EPDisbldMsk | DOEPMSK_AHBErrMsk | |
| DOEPMSK_SetupMsk, |
| hsotg->regs + DOEPMSK); |
| |
| writel(0, hsotg->regs + DAINTMSK); |
| |
| dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", |
| readl(hsotg->regs + DIEPCTL0), |
| readl(hsotg->regs + DOEPCTL0)); |
| |
| /* enable in and out endpoint interrupts */ |
| s3c_hsotg_en_gsint(hsotg, GINTSTS_OEPInt | GINTSTS_IEPInt); |
| |
| /* |
| * Enable the RXFIFO when in slave mode, as this is how we collect |
| * the data. In DMA mode, we get events from the FIFO but also |
| * things we cannot process, so do not use it. |
| */ |
| if (!using_dma(hsotg)) |
| s3c_hsotg_en_gsint(hsotg, GINTSTS_RxFLvl); |
| |
| /* Enable interrupts for EP0 in and out */ |
| s3c_hsotg_ctrl_epint(hsotg, 0, 0, 1); |
| s3c_hsotg_ctrl_epint(hsotg, 0, 1, 1); |
| |
| __orr32(hsotg->regs + DCTL, DCTL_PWROnPrgDone); |
| udelay(10); /* see openiboot */ |
| __bic32(hsotg->regs + DCTL, DCTL_PWROnPrgDone); |
| |
| dev_dbg(hsotg->dev, "DCTL=0x%08x\n", readl(hsotg->regs + DCTL)); |
| |
| /* |
| * DxEPCTL_USBActEp says RO in manual, but seems to be set by |
| * writing to the EPCTL register.. |
| */ |
| |
| /* set to read 1 8byte packet */ |
| writel(DxEPTSIZ_MC(1) | DxEPTSIZ_PktCnt(1) | |
| DxEPTSIZ_XferSize(8), hsotg->regs + DOEPTSIZ0); |
| |
| writel(s3c_hsotg_ep0_mps(hsotg->eps[0].ep.maxpacket) | |
| DxEPCTL_CNAK | DxEPCTL_EPEna | |
| DxEPCTL_USBActEp, |
| hsotg->regs + DOEPCTL0); |
| |
| /* enable, but don't activate EP0in */ |
| writel(s3c_hsotg_ep0_mps(hsotg->eps[0].ep.maxpacket) | |
| DxEPCTL_USBActEp, hsotg->regs + DIEPCTL0); |
| |
| s3c_hsotg_enqueue_setup(hsotg); |
| |
| dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", |
| readl(hsotg->regs + DIEPCTL0), |
| readl(hsotg->regs + DOEPCTL0)); |
| |
| /* clear global NAKs */ |
| writel(DCTL_CGOUTNak | DCTL_CGNPInNAK, |
| hsotg->regs + DCTL); |
| |
| /* must be at-least 3ms to allow bus to see disconnect */ |
| mdelay(3); |
| |
| /* remove the soft-disconnect and let's go */ |
| __bic32(hsotg->regs + DCTL, DCTL_SftDiscon); |
| } |
| |
| /** |
| * s3c_hsotg_irq - handle device interrupt |
| * @irq: The IRQ number triggered |
| * @pw: The pw value when registered the handler. |
| */ |
| static irqreturn_t s3c_hsotg_irq(int irq, void *pw) |
| { |
| struct s3c_hsotg *hsotg = pw; |
| int retry_count = 8; |
| u32 gintsts; |
| u32 gintmsk; |
| |
| spin_lock(&hsotg->lock); |
| irq_retry: |
| gintsts = readl(hsotg->regs + GINTSTS); |
| gintmsk = readl(hsotg->regs + GINTMSK); |
| |
| dev_dbg(hsotg->dev, "%s: %08x %08x (%08x) retry %d\n", |
| __func__, gintsts, gintsts & gintmsk, gintmsk, retry_count); |
| |
| gintsts &= gintmsk; |
| |
| if (gintsts & GINTSTS_OTGInt) { |
| u32 otgint = readl(hsotg->regs + GOTGINT); |
| |
| dev_info(hsotg->dev, "OTGInt: %08x\n", otgint); |
| |
| writel(otgint, hsotg->regs + GOTGINT); |
| } |
| |
| if (gintsts & GINTSTS_SessReqInt) { |
| dev_dbg(hsotg->dev, "%s: SessReqInt\n", __func__); |
| writel(GINTSTS_SessReqInt, hsotg->regs + GINTSTS); |
| } |
| |
| if (gintsts & GINTSTS_EnumDone) { |
| writel(GINTSTS_EnumDone, hsotg->regs + GINTSTS); |
| |
| s3c_hsotg_irq_enumdone(hsotg); |
| } |
| |
| if (gintsts & GINTSTS_ConIDStsChng) { |
| dev_dbg(hsotg->dev, "ConIDStsChg (DSTS=0x%08x, GOTCTL=%08x)\n", |
| readl(hsotg->regs + DSTS), |
| readl(hsotg->regs + GOTGCTL)); |
| |
| writel(GINTSTS_ConIDStsChng, hsotg->regs + GINTSTS); |
| } |
| |
| if (gintsts & (GINTSTS_OEPInt | GINTSTS_IEPInt)) { |
| u32 daint = readl(hsotg->regs + DAINT); |
| u32 daint_out = daint >> DAINT_OutEP_SHIFT; |
| u32 daint_in = daint & ~(daint_out << DAINT_OutEP_SHIFT); |
| int ep; |
| |
| dev_dbg(hsotg->dev, "%s: daint=%08x\n", __func__, daint); |
| |
| for (ep = 0; ep < 15 && daint_out; ep++, daint_out >>= 1) { |
| if (daint_out & 1) |
| s3c_hsotg_epint(hsotg, ep, 0); |
| } |
| |
| for (ep = 0; ep < 15 && daint_in; ep++, daint_in >>= 1) { |
| if (daint_in & 1) |
| s3c_hsotg_epint(hsotg, ep, 1); |
| } |
| } |
| |
| if (gintsts & GINTSTS_USBRst) { |
| |
| u32 usb_status = readl(hsotg->regs + GOTGCTL); |
| |
| dev_info(hsotg->dev, "%s: USBRst\n", __func__); |
| dev_dbg(hsotg->dev, "GNPTXSTS=%08x\n", |
| readl(hsotg->regs + GNPTXSTS)); |
| |
| writel(GINTSTS_USBRst, hsotg->regs + GINTSTS); |
| |
| if (usb_status & GOTGCTL_BSESVLD) { |
| if (time_after(jiffies, hsotg->last_rst + |
| msecs_to_jiffies(200))) { |
| |
| kill_all_requests(hsotg, &hsotg->eps[0], |
| -ECONNRESET, true); |
| |
| s3c_hsotg_core_init(hsotg); |
| hsotg->last_rst = jiffies; |
| } |
| } |
| } |
| |
| /* check both FIFOs */ |
| |
| if (gintsts & GINTSTS_NPTxFEmp) { |
| dev_dbg(hsotg->dev, "NPTxFEmp\n"); |
| |
| /* |
| * Disable the interrupt to stop it happening again |
| * unless one of these endpoint routines decides that |
| * it needs re-enabling |
| */ |
| |
| s3c_hsotg_disable_gsint(hsotg, GINTSTS_NPTxFEmp); |
| s3c_hsotg_irq_fifoempty(hsotg, false); |
| } |
| |
| if (gintsts & GINTSTS_PTxFEmp) { |
| dev_dbg(hsotg->dev, "PTxFEmp\n"); |
| |
| /* See note in GINTSTS_NPTxFEmp */ |
| |
| s3c_hsotg_disable_gsint(hsotg, GINTSTS_PTxFEmp); |
| s3c_hsotg_irq_fifoempty(hsotg, true); |
| } |
| |
| if (gintsts & GINTSTS_RxFLvl) { |
| /* |
| * note, since GINTSTS_RxFLvl doubles as FIFO-not-empty, |
| * we need to retry s3c_hsotg_handle_rx if this is still |
| * set. |
| */ |
| |
| s3c_hsotg_handle_rx(hsotg); |
| } |
| |
| if (gintsts & GINTSTS_ModeMis) { |
| dev_warn(hsotg->dev, "warning, mode mismatch triggered\n"); |
| writel(GINTSTS_ModeMis, hsotg->regs + GINTSTS); |
| } |
| |
| if (gintsts & GINTSTS_USBSusp) { |
| dev_info(hsotg->dev, "GINTSTS_USBSusp\n"); |
| writel(GINTSTS_USBSusp, hsotg->regs + GINTSTS); |
| |
| call_gadget(hsotg, suspend); |
| s3c_hsotg_disconnect(hsotg); |
| } |
| |
| if (gintsts & GINTSTS_WkUpInt) { |
| dev_info(hsotg->dev, "GINTSTS_WkUpIn\n"); |
| writel(GINTSTS_WkUpInt, hsotg->regs + GINTSTS); |
| |
| call_gadget(hsotg, resume); |
| } |
| |
| if (gintsts & GINTSTS_ErlySusp) { |
| dev_dbg(hsotg->dev, "GINTSTS_ErlySusp\n"); |
| writel(GINTSTS_ErlySusp, hsotg->regs + GINTSTS); |
| |
| s3c_hsotg_disconnect(hsotg); |
| } |
| |
| /* |
| * these next two seem to crop-up occasionally causing the core |
| * to shutdown the USB transfer, so try clearing them and logging |
| * the occurrence. |
| */ |
| |
| if (gintsts & GINTSTS_GOUTNakEff) { |
| dev_info(hsotg->dev, "GOUTNakEff triggered\n"); |
| |
| writel(DCTL_CGOUTNak, hsotg->regs + DCTL); |
| |
| s3c_hsotg_dump(hsotg); |
| } |
| |
| if (gintsts & GINTSTS_GINNakEff) { |
| dev_info(hsotg->dev, "GINNakEff triggered\n"); |
| |
| writel(DCTL_CGNPInNAK, hsotg->regs + DCTL); |
| |
| s3c_hsotg_dump(hsotg); |
| } |
| |
| /* |
| * if we've had fifo events, we should try and go around the |
| * loop again to see if there's any point in returning yet. |
| */ |
| |
| if (gintsts & IRQ_RETRY_MASK && --retry_count > 0) |
| goto irq_retry; |
| |
| spin_unlock(&hsotg->lock); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * s3c_hsotg_ep_enable - enable the given endpoint |
| * @ep: The USB endpint to configure |
| * @desc: The USB endpoint descriptor to configure with. |
| * |
| * This is called from the USB gadget code's usb_ep_enable(). |
| */ |
| static int s3c_hsotg_ep_enable(struct usb_ep *ep, |
| const struct usb_endpoint_descriptor *desc) |
| { |
| struct s3c_hsotg_ep *hs_ep = our_ep(ep); |
| struct s3c_hsotg *hsotg = hs_ep->parent; |
| unsigned long flags; |
| int index = hs_ep->index; |
| u32 epctrl_reg; |
| u32 epctrl; |
| u32 mps; |
| int dir_in; |
| int ret = 0; |
| |
| dev_dbg(hsotg->dev, |
| "%s: ep %s: a 0x%02x, attr 0x%02x, mps 0x%04x, intr %d\n", |
| __func__, ep->name, desc->bEndpointAddress, desc->bmAttributes, |
| desc->wMaxPacketSize, desc->bInterval); |
| |
| /* not to be called for EP0 */ |
| WARN_ON(index == 0); |
| |
| dir_in = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? 1 : 0; |
| if (dir_in != hs_ep->dir_in) { |
| dev_err(hsotg->dev, "%s: direction mismatch!\n", __func__); |
| return -EINVAL; |
| } |
| |
| mps = usb_endpoint_maxp(desc); |
| |
| /* note, we handle this here instead of s3c_hsotg_set_ep_maxpacket */ |
| |
| epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); |
| epctrl = readl(hsotg->regs + epctrl_reg); |
| |
| dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x from 0x%08x\n", |
| __func__, epctrl, epctrl_reg); |
| |
| spin_lock_irqsave(&hsotg->lock, flags); |
| |
| epctrl &= ~(DxEPCTL_EPType_MASK | DxEPCTL_MPS_MASK); |
| epctrl |= DxEPCTL_MPS(mps); |
| |
| /* |
| * mark the endpoint as active, otherwise the core may ignore |
| * transactions entirely for this endpoint |
| */ |
| epctrl |= DxEPCTL_USBActEp; |
| |
| /* |
| * set the NAK status on the endpoint, otherwise we might try and |
| * do something with data that we've yet got a request to process |
| * since the RXFIFO will take data for an endpoint even if the |
| * size register hasn't been set. |
| */ |
| |
| epctrl |= DxEPCTL_SNAK; |
| |
| /* update the endpoint state */ |
| hs_ep->ep.maxpacket = mps; |
| |
| /* default, set to non-periodic */ |
| hs_ep->periodic = 0; |
| |
| switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { |
| case USB_ENDPOINT_XFER_ISOC: |
| dev_err(hsotg->dev, "no current ISOC support\n"); |
| ret = -EINVAL; |
| goto out; |
| |
| case USB_ENDPOINT_XFER_BULK: |
| epctrl |= DxEPCTL_EPType_Bulk; |
| break; |
| |
| case USB_ENDPOINT_XFER_INT: |
| if (dir_in) { |
| /* |
| * Allocate our TxFNum by simply using the index |
| * of the endpoint for the moment. We could do |
| * something better if the host indicates how |
| * many FIFOs we are expecting to use. |
| */ |
| |
| hs_ep->periodic = 1; |
| epctrl |= DxEPCTL_TxFNum(index); |
| } |
| |
| epctrl |= DxEPCTL_EPType_Intterupt; |
| break; |
| |
| case USB_ENDPOINT_XFER_CONTROL: |
| epctrl |= DxEPCTL_EPType_Control; |
| break; |
| } |
| |
| /* |
| * if the hardware has dedicated fifos, we must give each IN EP |
| * a unique tx-fifo even if it is non-periodic. |
| */ |
| if (dir_in && hsotg->dedicated_fifos) |
| epctrl |= DxEPCTL_TxFNum(index); |
| |
| /* for non control endpoints, set PID to D0 */ |
| if (index) |
| epctrl |= DxEPCTL_SetD0PID; |
| |
| dev_dbg(hsotg->dev, "%s: write DxEPCTL=0x%08x\n", |
| __func__, epctrl); |
| |
| writel(epctrl, hsotg->regs + epctrl_reg); |
| dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x\n", |
| __func__, readl(hsotg->regs + epctrl_reg)); |
| |
| /* enable the endpoint interrupt */ |
| s3c_hsotg_ctrl_epint(hsotg, index, dir_in, 1); |
| |
| out: |
| spin_unlock_irqrestore(&hsotg->lock, flags); |
| return ret; |
| } |
| |
| /** |
| * s3c_hsotg_ep_disable - disable given endpoint |
| * @ep: The endpoint to disable. |
| */ |
| static int s3c_hsotg_ep_disable(struct usb_ep *ep) |
| { |
| struct s3c_hsotg_ep *hs_ep = our_ep(ep); |
| struct s3c_hsotg *hsotg = hs_ep->parent; |
| int dir_in = hs_ep->dir_in; |
| int index = hs_ep->index; |
| unsigned long flags; |
| u32 epctrl_reg; |
| u32 ctrl; |
| |
| dev_info(hsotg->dev, "%s(ep %p)\n", __func__, ep); |
| |
| if (ep == &hsotg->eps[0].ep) { |
| dev_err(hsotg->dev, "%s: called for ep0\n", __func__); |
| return -EINVAL; |
| } |
| |
| epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); |
| |
| spin_lock_irqsave(&hsotg->lock, flags); |
| /* terminate all requests with shutdown */ |
| kill_all_requests(hsotg, hs_ep, -ESHUTDOWN, false); |
| |
| |
| ctrl = readl(hsotg->regs + epctrl_reg); |
| ctrl &= ~DxEPCTL_EPEna; |
| ctrl &= ~DxEPCTL_USBActEp; |
| ctrl |= DxEPCTL_SNAK; |
| |
| dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl); |
| writel(ctrl, hsotg->regs + epctrl_reg); |
| |
| /* disable endpoint interrupts */ |
| s3c_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 0); |
| |
| spin_unlock_irqrestore(&hsotg->lock, flags); |
| return 0; |
| } |
| |
| /** |
| * on_list - check request is on the given endpoint |
| * @ep: The endpoint to check. |
| * @test: The request to test if it is on the endpoint. |
| */ |
| static bool on_list(struct s3c_hsotg_ep *ep, struct s3c_hsotg_req *test) |
| { |
| struct s3c_hsotg_req *req, *treq; |
| |
| list_for_each_entry_safe(req, treq, &ep->queue, queue) { |
| if (req == test) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * s3c_hsotg_ep_dequeue - dequeue given endpoint |
| * @ep: The endpoint to dequeue. |
| * @req: The request to be removed from a queue. |
| */ |
| static int s3c_hsotg_ep_dequeue(struct usb_ep *ep, struct usb_request *req) |
| { |
| struct s3c_hsotg_req *hs_req = our_req(req); |
| struct s3c_hsotg_ep *hs_ep = our_ep(ep); |
| struct s3c_hsotg *hs = hs_ep->parent; |
| unsigned long flags; |
| |
| dev_info(hs->dev, "ep_dequeue(%p,%p)\n", ep, req); |
| |
| spin_lock_irqsave(&hs->lock, flags); |
| |
| if (!on_list(hs_ep, hs_req)) { |
| spin_unlock_irqrestore(&hs->lock, flags); |
| return -EINVAL; |
| } |
| |
| s3c_hsotg_complete_request(hs, hs_ep, hs_req, -ECONNRESET); |
| spin_unlock_irqrestore(&hs->lock, flags); |
| |
| return 0; |
| } |
| |
| /** |
| * s3c_hsotg_ep_sethalt - set halt on a given endpoint |
| * @ep: The endpoint to set halt. |
| * @value: Set or unset the halt. |
| */ |
| static int s3c_hsotg_ep_sethalt(struct usb_ep *ep, int value) |
| { |
| struct s3c_hsotg_ep *hs_ep = our_ep(ep); |
| struct s3c_hsotg *hs = hs_ep->parent; |
| int index = hs_ep->index; |
| u32 epreg; |
| u32 epctl; |
| u32 xfertype; |
| |
| dev_info(hs->dev, "%s(ep %p %s, %d)\n", __func__, ep, ep->name, value); |
| |
| /* write both IN and OUT control registers */ |
| |
| epreg = DIEPCTL(index); |
| epctl = readl(hs->regs + epreg); |
| |
| if (value) { |
| epctl |= DxEPCTL_Stall + DxEPCTL_SNAK; |
| if (epctl & DxEPCTL_EPEna) |
| epctl |= DxEPCTL_EPDis; |
| } else { |
| epctl &= ~DxEPCTL_Stall; |
| xfertype = epctl & DxEPCTL_EPType_MASK; |
| if (xfertype == DxEPCTL_EPType_Bulk || |
| xfertype == DxEPCTL_EPType_Intterupt) |
| epctl |= DxEPCTL_SetD0PID; |
| } |
| |
| writel(epctl, hs->regs + epreg); |
| |
| epreg = DOEPCTL(index); |
| epctl = readl(hs->regs + epreg); |
| |
| if (value) |
| epctl |= DxEPCTL_Stall; |
| else { |
| epctl &= ~DxEPCTL_Stall; |
| xfertype = epctl & DxEPCTL_EPType_MASK; |
| if (xfertype == DxEPCTL_EPType_Bulk || |
| xfertype == DxEPCTL_EPType_Intterupt) |
| epctl |= DxEPCTL_SetD0PID; |
| } |
| |
| writel(epctl, hs->regs + epreg); |
| |
| return 0; |
| } |
| |
| /** |
| * s3c_hsotg_ep_sethalt_lock - set halt on a given endpoint with lock held |
| * @ep: The endpoint to set halt. |
| * @value: Set or unset the halt. |
| */ |
| static int s3c_hsotg_ep_sethalt_lock(struct usb_ep *ep, int value) |
| { |
| struct s3c_hsotg_ep *hs_ep = our_ep(ep); |
| struct s3c_hsotg *hs = hs_ep->parent; |
| unsigned long flags = 0; |
| int ret = 0; |
| |
| spin_lock_irqsave(&hs->lock, flags); |
| ret = s3c_hsotg_ep_sethalt(ep, value); |
| spin_unlock_irqrestore(&hs->lock, flags); |
| |
| return ret; |
| } |
| |
| static struct usb_ep_ops s3c_hsotg_ep_ops = { |
| .enable = s3c_hsotg_ep_enable, |
| .disable = s3c_hsotg_ep_disable, |
| .alloc_request = s3c_hsotg_ep_alloc_request, |
| .free_request = s3c_hsotg_ep_free_request, |
| .queue = s3c_hsotg_ep_queue_lock, |
| .dequeue = s3c_hsotg_ep_dequeue, |
| .set_halt = s3c_hsotg_ep_sethalt_lock, |
| /* note, don't believe we have any call for the fifo routines */ |
| }; |
| |
| /** |
| * s3c_hsotg_phy_enable - enable platform phy dev |
| * @hsotg: The driver state |
| * |
| * A wrapper for platform code responsible for controlling |
| * low-level USB code |
| */ |
| static void s3c_hsotg_phy_enable(struct s3c_hsotg *hsotg) |
| { |
| struct platform_device *pdev = to_platform_device(hsotg->dev); |
| |
| dev_dbg(hsotg->dev, "pdev 0x%p\n", pdev); |
| if (hsotg->plat->phy_init) |
| hsotg->plat->phy_init(pdev, hsotg->plat->phy_type); |
| } |
| |
| /** |
| * s3c_hsotg_phy_disable - disable platform phy dev |
| * @hsotg: The driver state |
| * |
| * A wrapper for platform code responsible for controlling |
| * low-level USB code |
| */ |
| static void s3c_hsotg_phy_disable(struct s3c_hsotg *hsotg) |
| { |
| struct platform_device *pdev = to_platform_device(hsotg->dev); |
| |
| if (hsotg->plat->phy_exit) |
| hsotg->plat->phy_exit(pdev, hsotg->plat->phy_type); |
| } |
| |
| /** |
| * s3c_hsotg_init - initalize the usb core |
| * @hsotg: The driver state |
| */ |
| static void s3c_hsotg_init(struct s3c_hsotg *hsotg) |
| { |
| /* unmask subset of endpoint interrupts */ |
| |
| writel(DIEPMSK_TimeOUTMsk | DIEPMSK_AHBErrMsk | |
| DIEPMSK_EPDisbldMsk | DIEPMSK_XferComplMsk, |
| hsotg->regs + DIEPMSK); |
| |
| writel(DOEPMSK_SetupMsk | DOEPMSK_AHBErrMsk | |
| DOEPMSK_EPDisbldMsk | DOEPMSK_XferComplMsk, |
| hsotg->regs + DOEPMSK); |
| |
| writel(0, hsotg->regs + DAINTMSK); |
| |
| /* Be in disconnected state until gadget is registered */ |
| __orr32(hsotg->regs + DCTL, DCTL_SftDiscon); |
| |
| if (0) { |
| /* post global nak until we're ready */ |
| writel(DCTL_SGNPInNAK | DCTL_SGOUTNak, |
| hsotg->regs + DCTL); |
| } |
| |
| /* setup fifos */ |
| |
| dev_dbg(hsotg->dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n", |
| readl(hsotg->regs + GRXFSIZ), |
| readl(hsotg->regs + GNPTXFSIZ)); |
| |
| s3c_hsotg_init_fifo(hsotg); |
| |
| /* set the PLL on, remove the HNP/SRP and set the PHY */ |
| writel(GUSBCFG_PHYIf16 | GUSBCFG_TOutCal(7) | (0x5 << 10), |
| hsotg->regs + GUSBCFG); |
| |
| writel(using_dma(hsotg) ? GAHBCFG_DMAEn : 0x0, |
| hsotg->regs + GAHBCFG); |
| } |
| |
| /** |
| * s3c_hsotg_udc_start - prepare the udc for work |
| * @gadget: The usb gadget state |
| * @driver: The usb gadget driver |
| * |
| * Perform initialization to prepare udc device and driver |
| * to work. |
| */ |
| static int s3c_hsotg_udc_start(struct usb_gadget *gadget, |
| struct usb_gadget_driver *driver) |
| { |
| struct s3c_hsotg *hsotg = to_hsotg(gadget); |
| int ret; |
| |
| if (!hsotg) { |
| printk(KERN_ERR "%s: called with no device\n", __func__); |
| return -ENODEV; |
| } |
| |
| if (!driver) { |
| dev_err(hsotg->dev, "%s: no driver\n", __func__); |
| return -EINVAL; |
| } |
| |
| if (driver->max_speed < USB_SPEED_FULL) |
| dev_err(hsotg->dev, "%s: bad speed\n", __func__); |
| |
| if (!driver->setup) { |
| dev_err(hsotg->dev, "%s: missing entry points\n", __func__); |
| return -EINVAL; |
| } |
| |
| WARN_ON(hsotg->driver); |
| |
| driver->driver.bus = NULL; |
| hsotg->driver = driver; |
| hsotg->gadget.dev.driver = &driver->driver; |
| hsotg->gadget.dev.of_node = hsotg->dev->of_node; |
| hsotg->gadget.dev.dma_mask = hsotg->dev->dma_mask; |
| hsotg->gadget.speed = USB_SPEED_UNKNOWN; |
| |
| ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies), |
| hsotg->supplies); |
| if (ret) { |
| dev_err(hsotg->dev, "failed to enable supplies: %d\n", ret); |
| goto err; |
| } |
| |
| hsotg->last_rst = jiffies; |
| dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name); |
| return 0; |
| |
| err: |
| hsotg->driver = NULL; |
| hsotg->gadget.dev.driver = NULL; |
| return ret; |
| } |
| |
| /** |
| * s3c_hsotg_udc_stop - stop the udc |
| * @gadget: The usb gadget state |
| * @driver: The usb gadget driver |
| * |
| * Stop udc hw block and stay tunned for future transmissions |
| */ |
| static int s3c_hsotg_udc_stop(struct usb_gadget *gadget, |
| struct usb_gadget_driver *driver) |
| { |
| struct s3c_hsotg *hsotg = to_hsotg(gadget); |
| unsigned long flags = 0; |
| int ep; |
| |
| if (!hsotg) |
| return -ENODEV; |
| |
| if (!driver || driver != hsotg->driver || !driver->unbind) |
| return -EINVAL; |
| |
| /* all endpoints should be shutdown */ |
| for (ep = 0; ep < hsotg->num_of_eps; ep++) |
| s3c_hsotg_ep_disable(&hsotg->eps[ep].ep); |
| |
| spin_lock_irqsave(&hsotg->lock, flags); |
| |
| s3c_hsotg_phy_disable(hsotg); |
| regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies); |
| |
| hsotg->driver = NULL; |
| hsotg->gadget.speed = USB_SPEED_UNKNOWN; |
| hsotg->gadget.dev.driver = NULL; |
| |
| spin_unlock_irqrestore(&hsotg->lock, flags); |
| |
| dev_info(hsotg->dev, "unregistered gadget driver '%s'\n", |
| driver->driver.name); |
| |
| return 0; |
| } |
| |
| /** |
| * s3c_hsotg_gadget_getframe - read the frame number |
| * @gadget: The usb gadget state |
| * |
| * Read the {micro} frame number |
| */ |
| static int s3c_hsotg_gadget_getframe(struct usb_gadget *gadget) |
| { |
| return s3c_hsotg_read_frameno(to_hsotg(gadget)); |
| } |
| |
| /** |
| * s3c_hsotg_pullup - connect/disconnect the USB PHY |
| * @gadget: The usb gadget state |
| * @is_on: Current state of the USB PHY |
| * |
| * Connect/Disconnect the USB PHY pullup |
| */ |
| static int s3c_hsotg_pullup(struct usb_gadget *gadget, int is_on) |
| { |
| struct s3c_hsotg *hsotg = to_hsotg(gadget); |
| unsigned long flags = 0; |
| |
| dev_dbg(hsotg->dev, "%s: is_in: %d\n", __func__, is_on); |
| |
| spin_lock_irqsave(&hsotg->lock, flags); |
| if (is_on) { |
| s3c_hsotg_phy_enable(hsotg); |
| s3c_hsotg_core_init(hsotg); |
| } else { |
| s3c_hsotg_disconnect(hsotg); |
| s3c_hsotg_phy_disable(hsotg); |
| } |
| |
| hsotg->gadget.speed = USB_SPEED_UNKNOWN; |
| spin_unlock_irqrestore(&hsotg->lock, flags); |
| |
| return 0; |
| } |
| |
| static struct usb_gadget_ops s3c_hsotg_gadget_ops = { |
| .get_frame = s3c_hsotg_gadget_getframe, |
| .udc_start = s3c_hsotg_udc_start, |
| .udc_stop = s3c_hsotg_udc_stop, |
| .pullup = s3c_hsotg_pullup, |
| }; |
| |
| /** |
| * s3c_hsotg_initep - initialise a single endpoint |
| * @hsotg: The device state. |
| * @hs_ep: The endpoint to be initialised. |
| * @epnum: The endpoint number |
| * |
| * Initialise the given endpoint (as part of the probe and device state |
| * creation) to give to the gadget driver. Setup the endpoint name, any |
| * direction information and other state that may be required. |
| */ |
| static void __devinit s3c_hsotg_initep(struct s3c_hsotg *hsotg, |
| struct s3c_hsotg_ep *hs_ep, |
| int epnum) |
| { |
| u32 ptxfifo; |
| char *dir; |
| |
| if (epnum == 0) |
| dir = ""; |
| else if ((epnum % 2) == 0) { |
| dir = "out"; |
| } else { |
| dir = "in"; |
| hs_ep->dir_in = 1; |
| } |
| |
| hs_ep->index = epnum; |
| |
| snprintf(hs_ep->name, sizeof(hs_ep->name), "ep%d%s", epnum, dir); |
| |
| INIT_LIST_HEAD(&hs_ep->queue); |
| INIT_LIST_HEAD(&hs_ep->ep.ep_list); |
| |
| /* add to the list of endpoints known by the gadget driver */ |
| if (epnum) |
| list_add_tail(&hs_ep->ep.ep_list, &hsotg->gadget.ep_list); |
| |
| hs_ep->parent = hsotg; |
| hs_ep->ep.name = hs_ep->name; |
| hs_ep->ep.maxpacket = epnum ? 512 : EP0_MPS_LIMIT; |
| hs_ep->ep.ops = &s3c_hsotg_ep_ops; |
| |
| /* |
| * Read the FIFO size for the Periodic TX FIFO, even if we're |
| * an OUT endpoint, we may as well do this if in future the |
| * code is changed to make each endpoint's direction changeable. |
| */ |
| |
| ptxfifo = readl(hsotg->regs + DPTXFSIZn(epnum)); |
| hs_ep->fifo_size = DPTXFSIZn_DPTxFSize_GET(ptxfifo) * 4; |
| |
| /* |
| * if we're using dma, we need to set the next-endpoint pointer |
| * to be something valid. |
| */ |
| |
| if (using_dma(hsotg)) { |
| u32 next = DxEPCTL_NextEp((epnum + 1) % 15); |
| writel(next, hsotg->regs + DIEPCTL(epnum)); |
| writel(next, hsotg->regs + DOEPCTL(epnum)); |
| } |
| } |
| |
| /** |
| * s3c_hsotg_hw_cfg - read HW configuration registers |
| * @param: The device state |
| * |
| * Read the USB core HW configuration registers |
| */ |
| static void s3c_hsotg_hw_cfg(struct s3c_hsotg *hsotg) |
| { |
| u32 cfg2, cfg4; |
| /* check hardware configuration */ |
| |
| cfg2 = readl(hsotg->regs + 0x48); |
| hsotg->num_of_eps = (cfg2 >> 10) & 0xF; |
| |
| dev_info(hsotg->dev, "EPs:%d\n", hsotg->num_of_eps); |
| |
| cfg4 = readl(hsotg->regs + 0x50); |
| hsotg->dedicated_fifos = (cfg4 >> 25) & 1; |
| |
| dev_info(hsotg->dev, "%s fifos\n", |
| hsotg->dedicated_fifos ? "dedicated" : "shared"); |
| } |
| |
| /** |
| * s3c_hsotg_dump - dump state of the udc |
| * @param: The device state |
| */ |
| static void s3c_hsotg_dump(struct s3c_hsotg *hsotg) |
| { |
| #ifdef DEBUG |
| struct device *dev = hsotg->dev; |
| void __iomem *regs = hsotg->regs; |
| u32 val; |
| int idx; |
| |
| dev_info(dev, "DCFG=0x%08x, DCTL=0x%08x, DIEPMSK=%08x\n", |
| readl(regs + DCFG), readl(regs + DCTL), |
| readl(regs + DIEPMSK)); |
| |
| dev_info(dev, "GAHBCFG=0x%08x, 0x44=0x%08x\n", |
| readl(regs + GAHBCFG), readl(regs + 0x44)); |
| |
| dev_info(dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n", |
| readl(regs + GRXFSIZ), readl(regs + GNPTXFSIZ)); |
| |
| /* show periodic fifo settings */ |
| |
| for (idx = 1; idx <= 15; idx++) { |
| val = readl(regs + DPTXFSIZn(idx)); |
| dev_info(dev, "DPTx[%d] FSize=%d, StAddr=0x%08x\n", idx, |
| val >> DPTXFSIZn_DPTxFSize_SHIFT, |
| val & DPTXFSIZn_DPTxFStAddr_MASK); |
| } |
| |
| for (idx = 0; idx < 15; idx++) { |
| dev_info(dev, |
| "ep%d-in: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", idx, |
| readl(regs + DIEPCTL(idx)), |
| readl(regs + DIEPTSIZ(idx)), |
| readl(regs + DIEPDMA(idx))); |
| |
| val = readl(regs + DOEPCTL(idx)); |
| dev_info(dev, |
| "ep%d-out: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", |
| idx, readl(regs + DOEPCTL(idx)), |
| readl(regs + DOEPTSIZ(idx)), |
| readl(regs + DOEPDMA(idx))); |
| |
| } |
| |
| dev_info(dev, "DVBUSDIS=0x%08x, DVBUSPULSE=%08x\n", |
| readl(regs + DVBUSDIS), readl(regs + DVBUSPULSE)); |
| #endif |
| } |
| |
| /** |
| * state_show - debugfs: show overall driver and device state. |
| * @seq: The seq file to write to. |
| * @v: Unused parameter. |
| * |
| * This debugfs entry shows the overall state of the hardware and |
| * some general information about each of the endpoints available |
| * to the system. |
| */ |
| static int state_show(struct seq_file *seq, void *v) |
| { |
| struct s3c_hsotg *hsotg = seq->private; |
| void __iomem *regs = hsotg->regs; |
| int idx; |
| |
| seq_printf(seq, "DCFG=0x%08x, DCTL=0x%08x, DSTS=0x%08x\n", |
| readl(regs + DCFG), |
| readl(regs + DCTL), |
| readl(regs + DSTS)); |
| |
| seq_printf(seq, "DIEPMSK=0x%08x, DOEPMASK=0x%08x\n", |
| readl(regs + DIEPMSK), readl(regs + DOEPMSK)); |
| |
| seq_printf(seq, "GINTMSK=0x%08x, GINTSTS=0x%08x\n", |
| readl(regs + GINTMSK), |
| readl(regs + GINTSTS)); |
| |
| seq_printf(seq, "DAINTMSK=0x%08x, DAINT=0x%08x\n", |
| readl(regs + DAINTMSK), |
| readl(regs + DAINT)); |
| |
| seq_printf(seq, "GNPTXSTS=0x%08x, GRXSTSR=%08x\n", |
| readl(regs + GNPTXSTS), |
| readl(regs + GRXSTSR)); |
| |
| seq_printf(seq, "\nEndpoint status:\n"); |
| |
| for (idx = 0; idx < 15; idx++) { |
| u32 in, out; |
| |
| in = readl(regs + DIEPCTL(idx)); |
| out = readl(regs + DOEPCTL(idx)); |
| |
| seq_printf(seq, "ep%d: DIEPCTL=0x%08x, DOEPCTL=0x%08x", |
| idx, in, out); |
| |
| in = readl(regs + DIEPTSIZ(idx)); |
| out = readl(regs + DOEPTSIZ(idx)); |
| |
| seq_printf(seq, ", DIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x", |
| in, out); |
| |
| seq_printf(seq, "\n"); |
| } |
| |
| return 0; |
| } |
| |
| static int state_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, state_show, inode->i_private); |
| } |
| |
| static const struct file_operations state_fops = { |
| .owner = THIS_MODULE, |
| .open = state_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| /** |
| * fifo_show - debugfs: show the fifo information |
| * @seq: The seq_file to write data to. |
| * @v: Unused parameter. |
| * |
| * Show the FIFO information for the overall fifo and all the |
|