diff options
Diffstat (limited to 'drivers/usb/gadget/s3c-hsotg.c')
| -rw-r--r-- | drivers/usb/gadget/s3c-hsotg.c | 3269 |
1 files changed, 3269 insertions, 0 deletions
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c new file mode 100644 index 000000000000..50c71aae2cc2 --- /dev/null +++ b/drivers/usb/gadget/s3c-hsotg.c @@ -0,0 +1,3269 @@ +/* linux/drivers/usb/gadget/s3c-hsotg.c + * + * 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/usb/ch9.h> +#include <linux/usb/gadget.h> + +#include <mach/map.h> + +#include <plat/regs-usb-hsotg-phy.h> +#include <plat/regs-usb-hsotg.h> +#include <plat/regs-sys.h> +#include <plat/udc-hs.h> + +#define DMA_ADDR_INVALID (~((dma_addr_t)0)) + +/* EP0_MPS_LIMIT + * + * Unfortunately there seems to be a limit of the amount of data that can + * be transfered by IN transactions on EP0. This is either 127 bytes or 3 + * packets (which practially 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. + */ +struct s3c_hsotg_ep { + struct usb_ep ep; + struct list_head queue; + struct s3c_hsotg *parent; + struct s3c_hsotg_req *req; + struct dentry *debugfs; + + spinlock_t lock; + + 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]; +}; + +#define S3C_HSOTG_EPS (8+1) /* limit to 9 for the moment */ + +/** + * 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. + * @regs_res: The resource that was allocated when claiming register space. + * @irq: The IRQ number we are using + * @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. + * @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; + + void __iomem *regs; + struct resource *regs_res; + int irq; + + 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; + 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 + S3C_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 + S3C_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 + S3C_GINTMSK); + u32 new_gsintmsk; + + new_gsintmsk = gsintmsk & ~ints; + + if (new_gsintmsk != gsintmsk) + writel(new_gsintmsk, hsotg->regs + S3C_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 + S3C_DAINTMSK); + if (en) + daint |= bit; + else + daint &= ~bit; + writel(daint, hsotg->regs + S3C_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) +{ + /* the ryu 2.6.24 release ahs + writel(0x1C0, hsotg->regs + S3C_GRXFSIZ); + writel(S3C_GNPTXFSIZ_NPTxFStAddr(0x200) | + S3C_GNPTXFSIZ_NPTxFDep(0x1C0), + hsotg->regs + S3C_GNPTXFSIZ); + */ + + /* set FIFO sizes to 2048/0x1C0 */ + + writel(2048, hsotg->regs + S3C_GRXFSIZ); + writel(S3C_GNPTXFSIZ_NPTxFStAddr(2048) | + S3C_GNPTXFSIZ_NPTxFDep(0x1C0), + hsotg->regs + S3C_GNPTXFSIZ); +} + +/** + * @ep: USB endpoint to allocate request for. + * @flags: Allocation flags + * + * Allocate a new USB request structure appropriate for the specified endpoint + */ +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(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 + S3C_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) { + u32 epsize = readl(hsotg->regs + S3C_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 = S3C_DxEPTSIZ_XferSize_GET(epsize); + + 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, S3C_GINTSTS_PTxFEmp); + return -ENOSPC; + } + } else { + if (S3C_GNPTXSTS_NPTxQSpcAvail_GET(gnptxsts) == 0) { + dev_dbg(hsotg->dev, + "%s: no queue slots available (0x%08x)\n", + __func__, gnptxsts); + + s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_NPTxFEmp); + return -ENOSPC; + } + + can_write = S3C_GNPTXSTS_NPTxFSpcAvail_GET(gnptxsts); + } + + 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; + + /* see if we can write data */ + + if (to_write > can_write) { + to_write = can_write; + pkt_round = to_write % hs_ep->ep.maxpacket; + + /* Not sure, but we probably shouldn't be writing partial + * packets into the FIFO, so 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 ? S3C_GINTSTS_PTxFEmp : + S3C_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 + S3C_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 = S3C_DxEPTSIZ_XferSize_LIMIT + 1; + maxpkt = S3C_DxEPTSIZ_PktCnt_LIMIT + 1; + } else { + if (hs_ep->dir_in) { + /* maxsize = S3C_DIEPTSIZ0_XferSize_LIMIT + 1; */ + maxsize = 64+64+1; + maxpkt = S3C_DIEPTSIZ0_PktCnt_LIMIT + 1; + } else { + maxsize = 0x3f; + 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 ? S3C_DIEPCTL(index) : S3C_DOEPCTL(index); + epsize_reg = dir_in ? S3C_DIEPTSIZ(index) : S3C_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"); + + length = 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 = S3C_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 |= S3C_DxEPTSIZ_PktCnt(packets); + epsize |= S3C_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); + + ctrl = readl(hsotg->regs + epctrl_reg); + + if (ctrl & S3C_DxEPCTL_Stall) { + dev_warn(hsotg->dev, "%s: ep%d is stalled\n", __func__, index); + + /* not sure what we can do here, if it is EP0 then we should + * get this cleared once the endpoint has transmitted the + * STALL packet, otherwise it needs to be cleared by the + * host. + */ + } + + if (using_dma(hsotg)) { + unsigned int dma_reg; + + /* write DMA address to control register, buffer already + * synced by s3c_hsotg_ep_queue(). */ + + dma_reg = dir_in ? S3C_DIEPDMA(index) : S3C_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 |= S3C_DxEPCTL_EPEna; /* ensure ep enabled */ + ctrl |= S3C_DxEPCTL_USBActEp; + ctrl |= S3C_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(S3C_DIEPMSK_INTknTXFEmpMsk, + hsotg->regs + S3C_DIEPINT(index)); + + /* Note, trying to clear the NAK here causes problems with transmit + * on the S3C6400 ending up with the TXFIFO becomming full. */ + + /* check ep is enabled */ + if (!(readl(hsotg->regs + epctrl_reg) & S3C_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(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; + unsigned long irqflags; + 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; + } + + spin_lock_irqsave(&hs_ep->lock, irqflags); + + 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); + + spin_unlock_irqrestore(&hs_ep->lock, irqflags); + + return 0; +} + +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 > S3C_HSOTG_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); + +/** + * 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) +{ + bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE); + struct s3c_hsotg_ep *ep; + + 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); + 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 + S3C_DCFG); + dcfg &= ~S3C_DCFG_DevAddr_MASK; + dcfg |= ctrl->wValue << S3C_DCFG_DevAddr_SHIFT; + writel(dcfg, hsotg->regs + S3C_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); + } + + if (ret > 0) { + if (!ep0->dir_in) { + /* need to generate zlp in reply or take data */ + /* todo - deal with any data we might be sent? */ + ret = s3c_hsotg_send_reply(hsotg, ep0, NULL, 0); + } + } + + /* 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) ? S3C_DIEPCTL0 : S3C_DOEPCTL0; + + /* S3C_DxEPCTL_Stall will be cleared by EP once it has + * taken effect, so no need to clear later. */ + + ctrl = readl(hsotg->regs + reg); + ctrl |= S3C_DxEPCTL_Stall; + ctrl |= S3C_DxEPCTL_CNAK; + writel(ctrl, hsotg->regs + reg); + + dev_dbg(hsotg->dev, + "writen DxEPCTL=0x%08x to %08x (DxEPCTL=0x%08x)\n", + ctrl, reg, readl(hsotg->regs + reg)); + + /* don't belive 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. */ + } +} + +/** + * 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_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(&hs_ep->lock); + hs_req->req.complete(&hs_ep->ep, &hs_req->req); + spin_lock(&hs_ep->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_complete_request_lock - complete a request given to us (locked) + * @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) + * + * See s3c_hsotg_complete_request(), but called with the endpoint's + * lock held. +*/ +static void s3c_hsotg_complete_request_lock(struct s3c_hsotg *hsotg, + struct s3c_hsotg_ep *hs_ep, + struct s3c_hsotg_req *hs_req, + int result) +{ + unsigned long flags; + + spin_lock_irqsave(&hs_ep->lock, flags); + s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, result); + spin_unlock_irqrestore(&hs_ep->lock, flags); +} + +/** + * 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 + S3C_EPFIFO(ep_idx); + int to_read; + int max_req; + int read_ptr; + + if (!hs_req) { + u32 epctl = readl(hsotg->regs + S3C_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; + } + + spin_lock(&hs_ep->lock); + + to_read = size; + read_ptr = hs_req->req.actual; + max_req = hs_req->req.length - read_ptr; + + 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); + } + + dev_dbg(hsotg->dev, "%s: read %d/%d, done %d/%d\n", + __func__, to_read, max_req, read_ptr, hs_req->req.length); + + 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); + + spin_unlock(&hs_ep->lock); +} + +/** + * 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 belived 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(S3C_DxEPTSIZ_MC(1) | S3C_DxEPTSIZ_PktCnt(1) | + S3C_DxEPTSIZ_XferSize(0), hsotg->regs + S3C_DIEPTSIZ(0)); + + ctrl = readl(hsotg->regs + S3C_DIEPCTL0); + ctrl |= S3C_DxEPCTL_CNAK; /* clear NAK set by core */ + ctrl |= S3C_DxEPCTL_EPEna; /* ensure ep enabled */ + ctrl |= S3C_DxEPCTL_USBActEp; + writel(ctrl, hsotg->regs + S3C_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) +{ + 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; + int result = 0; + + if (!hs_req) { + dev_dbg(hsotg->dev, "%s: no request active\n", __func__); + return; + } + + if (using_dma(hsotg)) { + u32 epsize = readl(hsotg->regs + S3C_DOEPTSIZ(epnum)); + unsigned size_done; + unsigned size_left; + + /* 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_left = S3C_DxEPTSIZ_XferSize_GET(epsize); + + size_done = hs_ep->size_loaded - size_left; + size_done += hs_ep->last_load; + + req->actual = size_done; + } + + 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) { + if (!was_setup && req->complete != s3c_hsotg_complete_setup) + s3c_hsotg_send_zlp(hsotg, hs_req); + } + + s3c_hsotg_complete_request_lock(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 + S3C_DSTS); + dsts &= S3C_DSTS_SOFFN_MASK; + dsts >>= S3C_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 comming 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. + */ +void s3c_hsotg_handle_rx(struct s3c_hsotg *hsotg) +{ + u32 grxstsr = readl(hsotg->regs + S3C_GRXSTSP); + u32 epnum, status, size; + + WARN_ON(using_dma(hsotg)); + + epnum = grxstsr & S3C_GRXSTS_EPNum_MASK; + status = grxstsr & S3C_GRXSTS_PktSts_MASK; + + size = grxstsr & S3C_GRXSTS_ByteCnt_MASK; + size >>= S3C_GRXSTS_ByteCnt_SHIFT; + + if (1) + dev_dbg(hsotg->dev, "%s: GRXSTSP=0x%08x (%d@%d)\n", + __func__, grxstsr, size, epnum); + +#define __status(x) ((x) >> S3C_GRXSTS_PktSts_SHIFT) + + switch (status >> S3C_GRXSTS_PktSts_SHIFT) { + case __status(S3C_GRXSTS_PktSts_GlobalOutNAK): + dev_dbg(hsotg->dev, "GlobalOutNAK\n"); + break; + + case __status(S3C_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(S3C_GRXSTS_PktSts_SetupDone): + dev_dbg(hsotg->dev, + "SetupDone (Frame=0x%08x, DOPEPCTL=0x%08x)\n", + s3c_hsotg_read_frameno(hsotg), + readl(hsotg->regs + S3C_DOEPCTL(0))); + + s3c_hsotg_handle_outdone(hsotg, epnum, true); + break; + + case __status(S3C_GRXSTS_PktSts_OutRX): + s3c_hsotg_rx_data(hsotg, epnum, size); + break; + + case __status(S3C_GRXSTS_PktSts_SetupRX): + dev_dbg(hsotg->dev, + "SetupRX (Frame=0x%08x, DOPEPCTL=0x%08x)\n", + s3c_hsotg_read_frameno(hsotg), + readl(hsotg->regs + S3C_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 S3C_D0EPCTL_MPS_64; + case 32: + return S3C_D0EPCTL_MPS_32; + case 16: + return S3C_D0EPCTL_MPS_16; + case 8: + return S3C_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 >= S3C_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 + S3C_DIEPCTL(ep)); + reg &= ~S3C_DxEPCTL_MPS_MASK; + reg |= mpsval; + writel(reg, regs + S3C_DIEPCTL(ep)); + + reg = readl(regs + S3C_DOEPCTL(ep)); + reg &= ~S3C_DxEPCTL_MPS_MASK; + reg |= mpsval; + writel(reg, regs + S3C_DOEPCTL(ep)); + + return; + +bad_mps: + dev_err(hsotg->dev, "ep%d: bad mps of %d\n", ep, mps); +} + + +/** + * 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 + S3C_DIEPTSIZ(hs_ep->index)); + int size_left, size_done; + + if (!hs_req) { + dev_dbg(hsotg->dev, "XferCompl but no req\n"); + 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 = S3C_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; + + /* if we did all of the transfer, and there is more data left + * around, then try restarting the rest of the request */ + + 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_lock(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 ? S3C_DIEPINT(idx) : S3C_DOEPINT(idx); + u32 epctl_reg = dir_in ? S3C_DIEPCTL(idx) : S3C_DOEPCTL(idx); + u32 epsiz_reg = dir_in ? S3C_DIEPTSIZ(idx) : S3C_DOEPTSIZ(idx); + u32 ints; + u32 clear = 0; + + ints = readl(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 & S3C_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) + 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); + } + + clear |= S3C_DxEPINT_XferCompl; + } + + if (ints & S3C_DxEPINT_EPDisbld) { + dev_dbg(hsotg->dev, "%s: EPDisbld\n", __func__); + clear |= S3C_DxEPINT_EPDisbld; + } + + if (ints & S3C_DxEPINT_AHBErr) { + dev_dbg(hsotg->dev, "%s: AHBErr\n", __func__); + clear |= S3C_DxEPINT_AHBErr; + } + + if (ints & S3C_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); + } + + clear |= S3C_DxEPINT_Setup; + } + + if (ints & S3C_DxEPINT_Back2BackSetup) { + dev_dbg(hsotg->dev, "%s: B2BSetup/INEPNakEff\n", __func__); + clear |= S3C_DxEPINT_Back2BackSetup; + } + + if (dir_in) { + /* not sure if this is important, but we'll clear it anyway + */ + if (ints & S3C_DIEPMSK_INTknTXFEmpMsk) { + dev_dbg(hsotg->dev, "%s: ep%d: INTknTXFEmpMsk\n", + __func__, idx); + clear |= S3C_DIEPMSK_INTknTXFEmpMsk; + } + + /* this probably means something bad is happening */ + if (ints & S3C_DIEPMSK_INTknEPMisMsk) { + dev_warn(hsotg->dev, "%s: ep%d: INTknEP\n", + __func__, idx); + clear |= S3C_DIEPMSK_INTknEPMisMsk; + } + } + + writel(clear, hsotg->regs + epint_reg); +} + +/** + * 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 + S3C_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 & S3C_DSTS_EnumSpd_MASK) { + case S3C_DSTS_EnumSpd_FS: + case S3C_DSTS_EnumSpd_FS48: + hsotg->gadget.speed = USB_SPEED_FULL; + dev_info(hsotg->dev, "new device is full-speed\n"); + + ep0_mps = EP0_MPS_LIMIT; + ep_mps = 64; + break; + + case S3C_DSTS_EnumSpd_HS: + dev_info(hsotg->dev, "new device is high-speed\n"); + hsotg->gadget.speed = USB_SPEED_HIGH; + + ep0_mps = EP0_MPS_LIMIT; + ep_mps = 512; + break; + + case S3C_DSTS_EnumSpd_LS: + hsotg->gadget.speed = USB_SPEED_LOW; + dev_info(hsotg->dev, "new device is low-speed\n"); + + /* 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; + } + + /* 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 < S3C_HSOTG_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 + S3C_DIEPCTL0), + readl(hsotg->regs + S3C_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; + unsigned long flags; + + spin_lock_irqsave(&ep->lock, flags); + + 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); + } + + spin_unlock_irqrestore(&ep->lock, flags); +} + +#define call_gadget(_hs, _entry) \ + if ((_hs)->gadget.speed != USB_SPEED_UNKNOWN && \ + (_hs)->driver && (_hs)->driver->_entry) \ + (_hs)->driver->_entry(&(_hs)->gadget); + +/** + * s3c_hsotg_disconnect_irq - disconnect irq service + * @hsotg: The device state. + * + * A disconnect IRQ has been received, meaning that the host has + * lost contact with the bus. Remove all current transactions + * and signal the gadget driver that this has happened. +*/ +static void s3c_hsotg_disconnect_irq(struct s3c_hsotg *hsotg) +{ + unsigned ep; + + for (ep = 0; ep < S3C_HSOTG_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 < S3C_HSOTG_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; + } +} + +static struct s3c_hsotg *our_hsotg; + +/* IRQ flags which will trigger a retry around the IRQ loop */ +#define IRQ_RETRY_MASK (S3C_GINTSTS_NPTxFEmp | \ + S3C_GINTSTS_PTxFEmp | \ + S3C_GINTSTS_RxFLvl) + +/** + * 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; + +irq_retry: + gintsts = readl(hsotg->regs + S3C_GINTSTS); + gintmsk = readl(hsotg->regs + S3C_GINTMSK); + + dev_dbg(hsotg->dev, "%s: %08x %08x (%08x) retry %d\n", + __func__, gintsts, gintsts & gintmsk, gintmsk, retry_count); + + gintsts &= gintmsk; + + if (gintsts & S3C_GINTSTS_OTGInt) { + u32 otgint = readl(hsotg->regs + S3C_GOTGINT); + + dev_info(hsotg->dev, "OTGInt: %08x\n", otgint); + + writel(otgint, hsotg->regs + S3C_GOTGINT); + writel(S3C_GINTSTS_OTGInt, hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & S3C_GINTSTS_DisconnInt) { + dev_dbg(hsotg->dev, "%s: DisconnInt\n", __func__); + writel(S3C_GINTSTS_DisconnInt, hsotg->regs + S3C_GINTSTS); + + s3c_hsotg_disconnect_irq(hsotg); + } + + if (gintsts & S3C_GINTSTS_SessReqInt) { + dev_dbg(hsotg->dev, "%s: SessReqInt\n", __func__); + writel(S3C_GINTSTS_SessReqInt, hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & S3C_GINTSTS_EnumDone) { + s3c_hsotg_irq_enumdone(hsotg); + writel(S3C_GINTSTS_EnumDone, hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & S3C_GINTSTS_ConIDStsChng) { + dev_dbg(hsotg->dev, "ConIDStsChg (DSTS=0x%08x, GOTCTL=%08x)\n", + readl(hsotg->regs + S3C_DSTS), + readl(hsotg->regs + S3C_GOTGCTL)); + + writel(S3C_GINTSTS_ConIDStsChng, hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & (S3C_GINTSTS_OEPInt | S3C_GINTSTS_IEPInt)) { + u32 daint = readl(hsotg->regs + S3C_DAINT); + u32 daint_out = daint >> S3C_DAINT_OutEP_SHIFT; + u32 daint_in = daint & ~(daint_out << S3C_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); + } + + writel(daint, hsotg->regs + S3C_DAINT); + writel(gintsts & (S3C_GINTSTS_OEPInt | S3C_GINTSTS_IEPInt), + hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & S3C_GINTSTS_USBRst) { + dev_info(hsotg->dev, "%s: USBRst\n", __func__); + dev_dbg(hsotg->dev, "GNPTXSTS=%08x\n", + readl(hsotg->regs + S3C_GNPTXSTS)); + + kill_all_requests(hsotg, &hsotg->eps[0], -ECONNRESET, true); + + /* it seems after a reset we can end up with a situation + * where the TXFIFO still has data in it... try flushing + * it to remove anything that may still be in it. + */ + + if (1) { + writel(S3C_GRSTCTL_TxFNum(0) | S3C_GRSTCTL_TxFFlsh, + hsotg->regs + S3C_GRSTCTL); + + dev_info(hsotg->dev, "GNPTXSTS=%08x\n", + readl(hsotg->regs + S3C_GNPTXSTS)); + } + + s3c_hsotg_enqueue_setup(hsotg); + + writel(S3C_GINTSTS_USBRst, hsotg->regs + S3C_GINTSTS); + } + + /* check both FIFOs */ + + if (gintsts & S3C_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, S3C_GINTSTS_NPTxFEmp); + s3c_hsotg_irq_fifoempty(hsotg, false); + + writel(S3C_GINTSTS_NPTxFEmp, hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & S3C_GINTSTS_PTxFEmp) { + dev_dbg(hsotg->dev, "PTxFEmp\n"); + + /* See note in S3C_GINTSTS_NPTxFEmp */ + + s3c_hsotg_disable_gsint(hsotg, S3C_GINTSTS_PTxFEmp); + s3c_hsotg_irq_fifoempty(hsotg, true); + + writel(S3C_GINTSTS_PTxFEmp, hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & S3C_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); + writel(S3C_GINTSTS_RxFLvl, hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & S3C_GINTSTS_ModeMis) { + dev_warn(hsotg->dev, "warning, mode mismatch triggered\n"); + writel(S3C_GINTSTS_ModeMis, hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & S3C_GINTSTS_USBSusp) { + dev_info(hsotg->dev, "S3C_GINTSTS_USBSusp\n"); + writel(S3C_GINTSTS_USBSusp, hsotg->regs + S3C_GINTSTS); + + call_gadget(hsotg, suspend); + } + + if (gintsts & S3C_GINTSTS_WkUpInt) { + dev_info(hsotg->dev, "S3C_GINTSTS_WkUpIn\n"); + writel(S3C_GINTSTS_WkUpInt, hsotg->regs + S3C_GINTSTS); + + call_gadget(hsotg, resume); + } + + if (gintsts & S3C_GINTSTS_ErlySusp) { + dev_dbg(hsotg->dev, "S3C_GINTSTS_ErlySusp\n"); + writel(S3C_GINTSTS_ErlySusp, hsotg->regs + S3C_GINTSTS); + } + + /* these next two seem to crop-up occasionally causing the core + * to shutdown the USB transfer, so try clearing them and logging + * the occurence. */ + + if (gintsts & S3C_GINTSTS_GOUTNakEff) { + dev_info(hsotg->dev, "GOUTNakEff triggered\n"); + + s3c_hsotg_dump(hsotg); + + writel(S3C_DCTL_CGOUTNak, hsotg->regs + S3C_DCTL); + writel(S3C_GINTSTS_GOUTNakEff, hsotg->regs + S3C_GINTSTS); + } + + if (gintsts & S3C_GINTSTS_GINNakEff) { + dev_info(hsotg->dev, "GINNakEff triggered\n"); + + s3c_hsotg_dump(hsotg); + + writel(S3C_DCTL_CGNPInNAK, hsotg->regs + S3C_DCTL); + writel(S3C_GINTSTS_GINNakEff, hsotg->regs + S3C_GINTSTS); + } + + /* 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; + + 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; + + 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 = le16_to_cpu(desc->wMaxPacketSize); + + /* note, we handle this here instead of s3c_hsotg_set_ep_maxpacket */ + + epctrl_reg = dir_in ? S3C_DIEPCTL(index) : S3C_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(&hs_ep->lock, flags); + + epctrl &= ~(S3C_DxEPCTL_EPType_MASK | S3C_DxEPCTL_MPS_MASK); + epctrl |= S3C_DxEPCTL_MPS(mps); + + /* mark the endpoint as active, otherwise the core may ignore + * transactions entirely for this endpoint */ + epctrl |= S3C_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 |= S3C_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"); + return -EINVAL; + + case USB_ENDPOINT_XFER_BULK: + epctrl |= S3C_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 |= S3C_DxEPCTL_TxFNum(index); + } + + epctrl |= S3C_DxEPCTL_EPType_Intterupt; + break; + + case USB_ENDPOINT_XFER_CONTROL: + epctrl |= S3C_DxEPCTL_EPType_Control; + break; + } + + /* for non control endpoints, set PID to D0 */ + if (index) + epctrl |= S3C_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); + + spin_unlock_irqrestore(&hs_ep->lock, flags); + return 0; +} + +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 ? S3C_DIEPCTL(index) : S3C_DOEPCTL(index); + + /* terminate all requests with shutdown */ + kill_all_requests(hsotg, hs_ep, -ESHUTDOWN, false); + + spin_lock_irqsave(&hs_ep->lock, flags); + + ctrl = readl(hsotg->regs + epctrl_reg); + ctrl &= ~S3C_DxEPCTL_EPEna; + ctrl &= ~S3C_DxEPCTL_USBActEp; + ctrl |= S3C_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(&hs_ep->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; +} + +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); + + if (hs_req == hs_ep->req) { + dev_dbg(hs->dev, "%s: already in progress\n", __func__); + return -EINPROGRESS; + } + + spin_lock_irqsave(&hs_ep->lock, flags); + + if (!on_list(hs_ep, hs_req)) { + spin_unlock_irqrestore(&hs_ep->lock, flags); + return -EINVAL; + } + + s3c_hsotg_complete_request(hs, hs_ep, hs_req, -ECONNRESET); + spin_unlock_irqrestore(&hs_ep->lock, flags); + + return 0; +} + +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; + unsigned long irqflags; + u32 epreg; + u32 epctl; + + dev_info(hs->dev, "%s(ep %p %s, %d)\n", __func__, ep, ep->name, value); + + spin_lock_irqsave(&hs_ep->lock, irqflags); + + /* write both IN and OUT control registers */ + + epreg = S3C_DIEPCTL(index); + epctl = readl(hs->regs + epreg); + + if (value) + epctl |= S3C_DxEPCTL_Stall; + else + epctl &= ~S3C_DxEPCTL_Stall; + + writel(epctl, hs->regs + epreg); + + epreg = S3C_DOEPCTL(index); + epctl = readl(hs->regs + epreg); + + if (value) + epctl |= S3C_DxEPCTL_Stall; + else + epctl &= ~S3C_DxEPCTL_Stall; + + writel(epctl, hs->regs + epreg); + + spin_unlock_irqrestore(&hs_ep->lock, irqflags); + + return 0; +} + +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, + .dequeue = s3c_hsotg_ep_dequeue, + .set_halt = s3c_hsotg_ep_sethalt, + /* note, don't belive we have any call for the fifo routines */ +}; + +/** + * 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(S3C_GRSTCTL_CSftRst, hsotg->regs + S3C_GRSTCTL); + + timeout = 1000; + do { + grstctl = readl(hsotg->regs + S3C_GRSTCTL); + } while (!(grstctl & S3C_GRSTCTL_CSftRst) && timeout-- > 0); + + if (!grstctl & S3C_GRSTCTL_CSftRst) { + dev_err(hsotg->dev, "Failed to get CSftRst asserted\n"); + return -EINVAL; + } + + timeout = 1000; + + while (1) { + u32 grstctl = readl(hsotg->regs + S3C_GRSTCTL); + + if (timeout-- < 0) { + dev_info(hsotg->dev, + "%s: reset failed, GRSTCTL=%08x\n", + __func__, grstctl); + return -ETIMEDOUT; + } + + if (grstctl & S3C_GRSTCTL_CSftRst) + continue; + + if (!(grstctl & S3C_GRSTCTL_AHBIdle)) + continue; + + break; /* reset done */ + } + + dev_dbg(hsotg->dev, "reset successful\n"); + return 0; +} + +int usb_gadget_register_driver(struct usb_gadget_driver *driver) +{ + struct s3c_hsotg *hsotg = our_hsotg; + 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->speed != USB_SPEED_HIGH && + driver->speed != USB_SPEED_FULL) { + dev_err(hsotg->dev, "%s: bad speed\n", __func__); + } + + if (!driver->bind || !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.dma_mask = hsotg->dev->dma_mask; + hsotg->gadget.speed = USB_SPEED_UNKNOWN; + + ret = device_add(&hsotg->gadget.dev); + if (ret) { + dev_err(hsotg->dev, "failed to register gadget device\n"); + goto err; + } + + ret = driver->bind(&hsotg->gadget); + if (ret) { + dev_err(hsotg->dev, "failed bind %s\n", driver->driver.name); + + hsotg->gadget.dev.driver = NULL; + hsotg->driver = NULL; + goto err; + } + + /* we must now enable ep0 ready for host detection and then + * set configuration. */ + + s3c_hsotg_corereset(hsotg); + + /* set the PLL on, remove the HNP/SRP and set the PHY */ + writel(S3C_GUSBCFG_PHYIf16 | S3C_GUSBCFG_TOutCal(7) | + (0x5 << 10), hsotg->regs + S3C_GUSBCFG); + + /* looks like soft-reset changes state of FIFOs */ + s3c_hsotg_init_fifo(hsotg); + + __orr32(hsotg->regs + S3C_DCTL, S3C_DCTL_SftDiscon); + + writel(1 << 18 | S3C_DCFG_DevSpd_HS, hsotg->regs + S3C_DCFG); + + writel(S3C_GINTSTS_DisconnInt | S3C_GINTSTS_SessReqInt | + S3C_GINTSTS_ConIDStsChng | S3C_GINTSTS_USBRst | + S3C_GINTSTS_EnumDone | S3C_GINTSTS_OTGInt | + S3C_GINTSTS_USBSusp | S3C_GINTSTS_WkUpInt | + S3C_GINTSTS_GOUTNakEff | S3C_GINTSTS_GINNakEff | + S3C_GINTSTS_ErlySusp, + hsotg->regs + S3C_GINTMSK); + + if (using_dma(hsotg)) + writel(S3C_GAHBCFG_GlblIntrEn | S3C_GAHBCFG_DMAEn | + S3C_GAHBCFG_HBstLen_Incr4, + hsotg->regs + S3C_GAHBCFG); + else + writel(S3C_GAHBCFG_GlblIntrEn, hsotg->regs + S3C_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(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk | + S3C_DIEPMSK_INTknEPMisMsk | + S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk, + hsotg->regs + S3C_DIEPMSK); + + /* don't need XferCompl, we get that from RXFIFO in slave mode. In + * DMA mode we may need this. */ + writel(S3C_DOEPMSK_SetupMsk | S3C_DOEPMSK_AHBErrMsk | + S3C_DOEPMSK_EPDisbldMsk | + using_dma(hsotg) ? (S3C_DIEPMSK_XferComplMsk | + S3C_DIEPMSK_TimeOUTMsk) : 0, + hsotg->regs + S3C_DOEPMSK); + + writel(0, hsotg->regs + S3C_DAINTMSK); + + dev_info(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", + readl(hsotg->regs + S3C_DIEPCTL0), + readl(hsotg->regs + S3C_DOEPCTL0)); + + /* enable in and out endpoint interrupts */ + s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_OEPInt | S3C_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, S3C_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 + S3C_DCTL, S3C_DCTL_PWROnPrgDone); + udelay(10); /* see openiboot */ + __bic32(hsotg->regs + S3C_DCTL, S3C_DCTL_PWROnPrgDone); + + dev_info(hsotg->dev, "DCTL=0x%08x\n", readl(hsotg->regs + S3C_DCTL)); + + /* S3C_DxEPCTL_USBActEp says RO in manual, but seems to be set by + writing to the EPCTL register.. */ + + /* set to read 1 8byte packet */ + writel(S3C_DxEPTSIZ_MC(1) | S3C_DxEPTSIZ_PktCnt(1) | + S3C_DxEPTSIZ_XferSize(8), hsotg->regs + DOEPTSIZ0); + + writel(s3c_hsotg_ep0_mps(hsotg->eps[0].ep.maxpacket) | + S3C_DxEPCTL_CNAK | S3C_DxEPCTL_EPEna | + S3C_DxEPCTL_USBActEp, + hsotg->regs + S3C_DOEPCTL0); + + /* enable, but don't activate EP0in */ + writel(s3c_hsotg_ep0_mps(hsotg->eps[0].ep.maxpacket) | + S3C_DxEPCTL_USBActEp, hsotg->regs + S3C_DIEPCTL0); + + s3c_hsotg_enqueue_setup(hsotg); + + dev_info(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", + readl(hsotg->regs + S3C_DIEPCTL0), + readl(hsotg->regs + S3C_DOEPCTL0)); + + /* clear global NAKs */ + writel(S3C_DCTL_CGOUTNak | S3C_DCTL_CGNPInNAK, + hsotg->regs + S3C_DCTL); + + /* remove the soft-disconnect and let's go */ + __bic32(hsotg->regs + S3C_DCTL, S3C_DCTL_SftDiscon); + + /* report to the user, and return */ + + dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name); + return 0; + +err: + hsotg->driver = NULL; + hsotg->gadget.dev.driver = NULL; + return ret; +} + +int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) +{ + struct s3c_hsotg *hsotg = our_hsotg; + int ep; + + if (!hsotg) + return -ENODEV; + + if (!driver || driver != hsotg->driver || !driver->unbind) + return -EINVAL; + + /* all endpoints should be shutdown */ + for (ep = 0; ep < S3C_HSOTG_EPS; ep++) + s3c_hsotg_ep_disable(&hsotg->eps[ep].ep); + + call_gadget(hsotg, disconnect); + + driver->unbind(&hsotg->gadget); + hsotg->driver = NULL; + hsotg->gadget.speed = USB_SPEED_UNKNOWN; + + device_del(&hsotg->gadget.dev); + + dev_info(hsotg->dev, "unregistered gadget driver '%s'\n", + driver->driver.name); + + return 0; +} +EXPORT_SYMBOL(usb_gadget_unregister_driver); + +static int s3c_hsotg_gadget_getframe(struct usb_gadget *gadget) +{ + return s3c_hsotg_read_frameno(to_hsotg(gadget)); +} + +static struct usb_gadget_ops s3c_hsotg_gadget_ops = { + .get_frame = s3c_hsotg_gadget_getframe, +}; + +/** + * 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); + + spin_lock_init(&hs_ep->lock); + + /* 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 + S3C_DPTXFSIZn(epnum)); + hs_ep->fifo_size = S3C_DPTXFSIZn_DPTxFSize_GET(ptxfifo); + + /* if we're using dma, we need to set the next-endpoint pointer + * to be something valid. + */ + + if (using_dma(hsotg)) { + u32 next = S3C_DxEPCTL_NextEp((epnum + 1) % 15); + writel(next, hsotg->regs + S3C_DIEPCTL(epnum)); + writel(next, hsotg->regs + S3C_DOEPCTL(epnum)); + } +} + +/** + * s3c_hsotg_otgreset - reset the OtG phy block + * @hsotg: The host state. + * + * Power up the phy, set the basic configuration and start the PHY. + */ +static void s3c_hsotg_otgreset(struct s3c_hsotg *hsotg) +{ + u32 osc; + + writel(0, S3C_PHYPWR); + mdelay(1); + + osc = hsotg->plat->is_osc ? S3C_PHYCLK_EXT_OSC : 0; + + writel(osc | 0x10, S3C_PHYCLK); + + /* issue a full set of resets to the otg and core */ + + writel(S3C_RSTCON_PHY, S3C_RSTCON); + udelay(20); /* at-least 10uS */ + writel(0, S3C_RSTCON); +} + + +static void s3c_hsotg_init(struct s3c_hsotg *hsotg) +{ + /* unmask subset of endpoint interrupts */ + + writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk | + S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk, + hsotg->regs + S3C_DIEPMSK); + + writel(S3C_DOEPMSK_SetupMsk | S3C_DOEPMSK_AHBErrMsk | + S3C_DOEPMSK_EPDisbldMsk | S3C_DOEPMSK_XferComplMsk, + hsotg->regs + S3C_DOEPMSK); + + writel(0, hsotg->regs + S3C_DAINTMSK); + + if (0) { + /* post global nak until we're ready */ + writel(S3C_DCTL_SGNPInNAK | S3C_DCTL_SGOUTNak, + hsotg->regs + S3C_DCTL); + } + + /* setup fifos */ + + dev_info(hsotg->dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n", + readl(hsotg->regs + S3C_GRXFSIZ), + readl(hsotg->regs + S3C_GNPTXFSIZ)); + + s3c_hsotg_init_fifo(hsotg); + + /* set the PLL on, remove the HNP/SRP and set the PHY */ + writel(S3C_GUSBCFG_PHYIf16 | S3C_GUSBCFG_TOutCal(7) | (0x5 << 10), + hsotg->regs + S3C_GUSBCFG); + + writel(using_dma(hsotg) ? S3C_GAHBCFG_DMAEn : 0x0, + hsotg->regs + S3C_GAHBCFG); +} + +static void s3c_hsotg_dump(struct s3c_hsotg *hsotg) +{ + 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 + S3C_DCFG), readl(regs + S3C_DCTL), + readl(regs + S3C_DIEPMSK)); + + dev_info(dev, "GAHBCFG=0x%08x, 0x44=0x%08x\n", + readl(regs + S3C_GAHBCFG), readl(regs + 0x44)); + + dev_info(dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n", + readl(regs + S3C_GRXFSIZ), readl(regs + S3C_GNPTXFSIZ)); + + /* show periodic fifo settings */ + + for (idx = 1; idx <= 15; idx++) { + val = readl(regs + S3C_DPTXFSIZn(idx)); + dev_info(dev, "DPTx[%d] FSize=%d, StAddr=0x%08x\n", idx, + val >> S3C_DPTXFSIZn_DPTxFSize_SHIFT, + val & S3C_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 + S3C_DIEPCTL(idx)), + readl(regs + S3C_DIEPTSIZ(idx)), + readl(regs + S3C_DIEPDMA(idx))); + + val = readl(regs + S3C_DOEPCTL(idx)); + dev_info(dev, + "ep%d-out: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", + idx, readl(regs + S3C_DOEPCTL(idx)), + readl(regs + S3C_DOEPTSIZ(idx)), + readl(regs + S3C_DOEPDMA(idx))); + + } + + dev_info(dev, "DVBUSDIS=0x%08x, DVBUSPULSE=%08x\n", + readl(regs + S3C_DVBUSDIS), readl(regs + S3C_DVBUSPULSE)); +} + + +/** + * 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 + S3C_DCFG), + readl(regs + S3C_DCTL), + readl(regs + S3C_DSTS)); + + seq_printf(seq, "DIEPMSK=0x%08x, DOEPMASK=0x%08x\n", + readl(regs + S3C_DIEPMSK), readl(regs + S3C_DOEPMSK)); + + seq_printf(seq, "GINTMSK=0x%08x, GINTSTS=0x%08x\n", + readl(regs + S3C_GINTMSK), + readl(regs + S3C_GINTSTS)); + + seq_printf(seq, "DAINTMSK=0x%08x, DAINT=0x%08x\n", + readl(regs + S3C_DAINTMSK), + readl(regs + S3C_DAINT)); + + seq_printf(seq, "GNPTXSTS=0x%08x, GRXSTSR=%08x\n", + readl(regs + S3C_GNPTXSTS), + readl(regs + S3C_GRXSTSR)); + + seq_printf(seq, "\nEndpoint status:\n"); + + for (idx = 0; idx < 15; idx++) { + u32 in, out; + + in = readl(regs + S3C_DIEPCTL(idx)); + out = readl(regs + S3C_DOEPCTL(idx)); + + seq_printf(seq, "ep%d: DIEPCTL=0x%08x, DOEPCTL=0x%08x", + idx, in, out); + + in = readl(regs + S3C_DIEPTSIZ(idx)); + out = readl(regs + S3C_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 + * periodic transmission FIFOs. +*/ +static int fifo_show(struct seq_file *seq, void *v) +{ + struct s3c_hsotg *hsotg = seq->private; + void __iomem *regs = hsotg->regs; + u32 val; + int idx; + + seq_printf(seq, "Non-periodic FIFOs:\n"); + seq_printf(seq, "RXFIFO: Size %d\n", readl(regs + S3C_GRXFSIZ)); + + val = readl(regs + S3C_GNPTXFSIZ); + seq_printf(seq, "NPTXFIFO: Size %d, Start 0x%08x\n", + val >> S3C_GNPTXFSIZ_NPTxFDep_SHIFT, + val & S3C_GNPTXFSIZ_NPTxFStAddr_MASK); + + seq_printf(seq, "\nPeriodic TXFIFOs:\n"); + + for (idx = 1; idx <= 15; idx++) { + val = readl(regs + S3C_DPTXFSIZn(idx)); + + seq_printf(seq, "\tDPTXFIFO%2d: Size %d, Start 0x%08x\n", idx, + val >> S3C_DPTXFSIZn_DPTxFSize_SHIFT, + val & S3C_DPTXFSIZn_DPTxFStAddr_MASK); + } + + return 0; +} + +static int fifo_open(struct inode *inode, struct file *file) +{ + return single_open(file, fifo_show, inode->i_private); +} + +static const struct file_operations fifo_fops = { + .owner = THIS_MODULE, + .open = fifo_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + + +static const char *decode_direction(int is_in) +{ + return is_in ? "in" : "out"; +} + +/** + * ep_show - debugfs: show the state of an endpoint. + * @seq: The seq_file to write data to. + * @v: Unused parameter. + * + * This debugfs entry shows the state of the given endpoint (one is + * registered for each available). +*/ +static int ep_show(struct seq_file *seq, void *v) +{ + struct s3c_hsotg_ep *ep = seq->private; + struct s3c_hsotg *hsotg = ep->parent; + struct s3c_hsotg_req *req; + void __iomem *regs = hsotg->regs; + int index = ep->index; + int show_limit = 15; + unsigned long flags; + + seq_printf(seq, "Endpoint index %d, named %s, dir %s:\n", + ep->index, ep->ep.name, decode_direction(ep->dir_in)); + + /* first show the register state */ + + seq_printf(seq, "\tDIEPCTL=0x%08x, DOEPCTL=0x%08x\n", + readl(regs + S3C_DIEPCTL(index)), + readl(regs + S3C_DOEPCTL(index))); + + seq_printf(seq, "\tDIEPDMA=0x%08x, DOEPDMA=0x%08x\n", + readl(regs + S3C_DIEPDMA(index)), + readl(regs + S3C_DOEPDMA(index))); + + seq_printf(seq, "\tDIEPINT=0x%08x, DOEPINT=0x%08x\n", + readl(regs + S3C_DIEPINT(index)), + readl(regs + S3C_DOEPINT(index))); + + seq_printf(seq, "\tDIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x\n", + readl(regs + S3C_DIEPTSIZ(index)), + readl(regs + S3C_DOEPTSIZ(index))); + + seq_printf(seq, "\n"); + seq_printf(seq, "mps %d\n", ep->ep.maxpacket); + seq_printf(seq, "total_data=%ld\n", ep->total_data); + + seq_printf(seq, "request list (%p,%p):\n", + ep->queue.next, ep->queue.prev); + + spin_lock_irqsave(&ep->lock, flags); + + list_for_each_entry(req, &ep->queue, queue) { + if (--show_limit < 0) { + seq_printf(seq, "not showing more requests...\n"); + break; + } + + seq_printf(seq, "%c req %p: %d bytes @%p, ", + req == ep->req ? '*' : ' ', + req, req->req.length, req->req.buf); + seq_printf(seq, "%d done, res %d\n", + req->req.actual, req->req.status); + } + + spin_unlock_irqrestore(&ep->lock, flags); + + return 0; +} + +static int ep_open(struct inode *inode, struct file *file) +{ + return single_open(file, ep_show, inode->i_private); +} + +static const struct file_operations ep_fops = { + .owner = THIS_MODULE, + .open = ep_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +/** + * s3c_hsotg_create_debug - create debugfs directory and files + * @hsotg: The driver state + * + * Create the debugfs files to allow the user to get information + * about the state of the system. The directory name is created + * with the same name as the device itself, in case we end up + * with multiple blocks in future systems. +*/ +static void __devinit s3c_hsotg_create_debug(struct s3c_hsotg *hsotg) +{ + struct dentry *root; + unsigned epidx; + + root = debugfs_create_dir(dev_name(hsotg->dev), NULL); + hsotg->debug_root = root; + if (IS_ERR(root)) { + dev_err(hsotg->dev, "cannot create debug root\n"); + return; + } + + /* create general state file */ + + hsotg->debug_file = debugfs_create_file("state", 0444, root, + hsotg, &state_fops); + + if (IS_ERR(hsotg->debug_file)) + dev_err(hsotg->dev, "%s: failed to create state\n", __func__); + + hsotg->debug_fifo = debugfs_create_file("fifo", 0444, root, + hsotg, &fifo_fops); + + if (IS_ERR(hsotg->debug_fifo)) + dev_err(hsotg->dev, "%s: failed to create fifo\n", __func__); + + /* create one file for each endpoint */ + + for (epidx = 0; epidx < S3C_HSOTG_EPS; epidx++) { + struct s3c_hsotg_ep *ep = &hsotg->eps[epidx]; + + ep->debugfs = debugfs_create_file(ep->name, 0444, + root, ep, &ep_fops); + + if (IS_ERR(ep->debugfs)) + dev_err(hsotg->dev, "failed to create %s debug file\n", + ep->name); + } +} + +/** + * s3c_hsotg_delete_debug - cleanup debugfs entries + * @hsotg: The driver state + * + * Cleanup (remove) the debugfs files for use on module exit. +*/ +static void __devexit s3c_hsotg_delete_debug(struct s3c_hsotg *hsotg) +{ + unsigned epidx; + + for (epidx = 0; epidx < S3C_HSOTG_EPS; epidx++) { + struct s3c_hsotg_ep *ep = &hsotg->eps[epidx]; + debugfs_remove(ep->debugfs); + } + + debugfs_remove(hsotg->debug_file); + debugfs_remove(hsotg->debug_fifo); + debugfs_remove(hsotg->debug_root); +} + +/** + * s3c_hsotg_gate - set the hardware gate for the block + * @pdev: The device we bound to + * @on: On or off. + * + * Set the hardware gate setting into the block. If we end up on + * something other than an S3C64XX, then we might need to change this + * to using a platform data callback, or some other mechanism. + */ +static void s3c_hsotg_gate(struct platform_device *pdev, bool on) +{ + unsigned long flags; + u32 others; + + local_irq_save(flags); + + others = __raw_readl(S3C64XX_OTHERS); + if (on) + others |= S3C64XX_OTHERS_USBMASK; + else + others &= ~S3C64XX_OTHERS_USBMASK; + __raw_writel(others, S3C64XX_OTHERS); + + local_irq_restore(flags); +} + +struct s3c_hsotg_plat s3c_hsotg_default_pdata; + +static int __devinit s3c_hsotg_probe(struct platform_device *pdev) +{ + struct s3c_hsotg_plat *plat = pdev->dev.platform_data; + struct device *dev = &pdev->dev; + struct s3c_hsotg *hsotg; + struct resource *res; + int epnum; + int ret; + + if (!plat) + plat = &s3c_hsotg_default_pdata; + + hsotg = kzalloc(sizeof(struct s3c_hsotg) + + sizeof(struct s3c_hsotg_ep) * S3C_HSOTG_EPS, + GFP_KERNEL); + if (!hsotg) { + dev_err(dev, "cannot get memory\n"); + return -ENOMEM; + } + + hsotg->dev = dev; + hsotg->plat = plat; + + platform_set_drvdata(pdev, hsotg); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "cannot find register resource 0\n"); + ret = -EINVAL; + goto err_mem; + } + + hsotg->regs_res = request_mem_region(res->start, resource_size(res), + dev_name(dev)); + if (!hsotg->regs_res) { + dev_err(dev, "cannot reserve registers\n"); + ret = -ENOENT; + goto err_mem; + } + + hsotg->regs = ioremap(res->start, resource_size(res)); + if (!hsotg->regs) { + dev_err(dev, "cannot map registers\n"); + ret = -ENXIO; + goto err_regs_res; + } + + ret = platform_get_irq(pdev, 0); + if (ret < 0) { + dev_err(dev, "cannot find IRQ\n"); + goto err_regs; + } + + hsotg->irq = ret; + + ret = request_irq(ret, s3c_hsotg_irq, 0, dev_name(dev), hsotg); + if (ret < 0) { + dev_err(dev, "cannot claim IRQ\n"); + goto err_regs; + } + + dev_info(dev, "regs %p, irq %d\n", hsotg->regs, hsotg->irq); + + device_initialize(&hsotg->gadget.dev); + + dev_set_name(&hsotg->gadget.dev, "gadget"); + + hsotg->gadget.is_dualspeed = 1; + hsotg->gadget.ops = &s3c_hsotg_gadget_ops; + hsotg->gadget.name = dev_name(dev); + + hsotg->gadget.dev.parent = dev; + hsotg->gadget.dev.dma_mask = dev->dma_mask; + + /* setup endpoint information */ + + INIT_LIST_HEAD(&hsotg->gadget.ep_list); + hsotg->gadget.ep0 = &hsotg->eps[0].ep; + + /* allocate EP0 request */ + + hsotg->ctrl_req = s3c_hsotg_ep_alloc_request(&hsotg->eps[0].ep, + GFP_KERNEL); + if (!hsotg->ctrl_req) { + dev_err(dev, "failed to allocate ctrl req\n"); + goto err_regs; + } + + /* reset the system */ + + s3c_hsotg_gate(pdev, true); + + s3c_hsotg_otgreset(hsotg); + s3c_hsotg_corereset(hsotg); + s3c_hsotg_init(hsotg); + + /* initialise the endpoints now the core has been initialised */ + for (epnum = 0; epnum < S3C_HSOTG_EPS; epnum++) + s3c_hsotg_initep(hsotg, &hsotg->eps[epnum], epnum); + + s3c_hsotg_create_debug(hsotg); + + s3c_hsotg_dump(hsotg); + + our_hsotg = hsotg; + return 0; + +err_regs: + iounmap(hsotg->regs); + +err_regs_res: + release_resource(hsotg->regs_res); + kfree(hsotg->regs_res); + +err_mem: + kfree(hsotg); + return ret; +} + +static int __devexit s3c_hsotg_remove(struct platform_device *pdev) +{ + struct s3c_hsotg *hsotg = platform_get_drvdata(pdev); + + s3c_hsotg_delete_debug(hsotg); + + usb_gadget_unregister_driver(hsotg->driver); + + free_irq(hsotg->irq, hsotg); + iounmap(hsotg->regs); + + release_resource(hsotg->regs_res); + kfree(hsotg->regs_res); + + s3c_hsotg_gate(pdev, false); + + kfree(hsotg); + return 0; +} + +#if 1 +#define s3c_hsotg_suspend NULL +#define s3c_hsotg_resume NULL +#endif + +static struct platform_driver s3c_hsotg_driver = { + .driver = { + .name = "s3c-hsotg", + .owner = THIS_MODULE, + }, + .probe = s3c_hsotg_probe, + .remove = __devexit_p(s3c_hsotg_remove), + .suspend = s3c_hsotg_suspend, + .resume = s3c_hsotg_resume, +}; + +static int __init s3c_hsotg_modinit(void) +{ + return platform_driver_register(&s3c_hsotg_driver); +} + +static void __exit s3c_hsotg_modexit(void) +{ + platform_driver_unregister(&s3c_hsotg_driver); +} + +module_init(s3c_hsotg_modinit); +module_exit(s3c_hsotg_modexit); + +MODULE_DESCRIPTION("Samsung S3C USB High-speed/OtG device"); +MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:s3c-hsotg"); |