blob: 4b5dbd0127f500a458094d4e7fc4fc267de146be [file] [log] [blame]
/* 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)
{