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linux-next/drivers/usb/gadget/amd5536udc.c
Sebastian Andrzej Siewior ffe0b33506 usb: gadget: remove global variable composite in composite.c 
This patch removes the global variable composite in composite.c.
The private data which was saved there is now passed via an additional
argument to the bind() function in struct usb_gadget_driver.

Only the "old-style" UDC drivers have to be touched here, new style are
doing it right because this change is made in udc-core.

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10 15:35:41 +03:00

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/*
* amd5536.c -- AMD 5536 UDC high/full speed USB device controller
*
* Copyright (C) 2005-2007 AMD (http://www.amd.com)
* Author: Thomas Dahlmann
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
/*
* The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536.
* It is a USB Highspeed DMA capable USB device controller. Beside ep0 it
* provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
*
* Make sure that UDC is assigned to port 4 by BIOS settings (port can also
* be used as host port) and UOC bits PAD_EN and APU are set (should be done
* by BIOS init).
*
* UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not
* work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0")
* can be used with gadget ether.
*/
/* debug control */
/* #define UDC_VERBOSE */
/* Driver strings */
#define UDC_MOD_DESCRIPTION "AMD 5536 UDC - USB Device Controller"
#define UDC_DRIVER_VERSION_STRING "01.00.0206"
/* system */
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/ioctl.h>
#include <linux/fs.h>
#include <linux/dmapool.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/prefetch.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
/* gadget stack */
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
/* udc specific */
#include "amd5536udc.h"
static void udc_tasklet_disconnect(unsigned long);
static void empty_req_queue(struct udc_ep *);
static int udc_probe(struct udc *dev);
static void udc_basic_init(struct udc *dev);
static void udc_setup_endpoints(struct udc *dev);
static void udc_soft_reset(struct udc *dev);
static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep);
static void udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq);
static int udc_free_dma_chain(struct udc *dev, struct udc_request *req);
static int udc_create_dma_chain(struct udc_ep *ep, struct udc_request *req,
unsigned long buf_len, gfp_t gfp_flags);
static int udc_remote_wakeup(struct udc *dev);
static int udc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
static void udc_pci_remove(struct pci_dev *pdev);
/* description */
static const char mod_desc[] = UDC_MOD_DESCRIPTION;
static const char name[] = "amd5536udc";
/* structure to hold endpoint function pointers */
static const struct usb_ep_ops udc_ep_ops;
/* received setup data */
static union udc_setup_data setup_data;
/* pointer to device object */
static struct udc *udc;
/* irq spin lock for soft reset */
static DEFINE_SPINLOCK(udc_irq_spinlock);
/* stall spin lock */
static DEFINE_SPINLOCK(udc_stall_spinlock);
/*
* slave mode: pending bytes in rx fifo after nyet,
* used if EPIN irq came but no req was available
*/
static unsigned int udc_rxfifo_pending;
/* count soft resets after suspend to avoid loop */
static int soft_reset_occured;
static int soft_reset_after_usbreset_occured;
/* timer */
static struct timer_list udc_timer;
static int stop_timer;
/* set_rde -- Is used to control enabling of RX DMA. Problem is
* that UDC has only one bit (RDE) to enable/disable RX DMA for
* all OUT endpoints. So we have to handle race conditions like
* when OUT data reaches the fifo but no request was queued yet.
* This cannot be solved by letting the RX DMA disabled until a
* request gets queued because there may be other OUT packets
* in the FIFO (important for not blocking control traffic).
* The value of set_rde controls the correspondig timer.
*
* set_rde -1 == not used, means it is alloed to be set to 0 or 1
* set_rde 0 == do not touch RDE, do no start the RDE timer
* set_rde 1 == timer function will look whether FIFO has data
* set_rde 2 == set by timer function to enable RX DMA on next call
*/
static int set_rde = -1;
static DECLARE_COMPLETION(on_exit);
static struct timer_list udc_pollstall_timer;
static int stop_pollstall_timer;
static DECLARE_COMPLETION(on_pollstall_exit);
/* tasklet for usb disconnect */
static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect,
(unsigned long) &udc);
/* endpoint names used for print */
static const char ep0_string[] = "ep0in";
static const char *const ep_string[] = {
ep0_string,
"ep1in-int", "ep2in-bulk", "ep3in-bulk", "ep4in-bulk", "ep5in-bulk",
"ep6in-bulk", "ep7in-bulk", "ep8in-bulk", "ep9in-bulk", "ep10in-bulk",
"ep11in-bulk", "ep12in-bulk", "ep13in-bulk", "ep14in-bulk",
"ep15in-bulk", "ep0out", "ep1out-bulk", "ep2out-bulk", "ep3out-bulk",
"ep4out-bulk", "ep5out-bulk", "ep6out-bulk", "ep7out-bulk",
"ep8out-bulk", "ep9out-bulk", "ep10out-bulk", "ep11out-bulk",
"ep12out-bulk", "ep13out-bulk", "ep14out-bulk", "ep15out-bulk"
};
/* DMA usage flag */
static bool use_dma = 1;
/* packet per buffer dma */
static bool use_dma_ppb = 1;
/* with per descr. update */
static bool use_dma_ppb_du;
/* buffer fill mode */
static int use_dma_bufferfill_mode;
/* full speed only mode */
static bool use_fullspeed;
/* tx buffer size for high speed */
static unsigned long hs_tx_buf = UDC_EPIN_BUFF_SIZE;
/* module parameters */
module_param(use_dma, bool, S_IRUGO);
MODULE_PARM_DESC(use_dma, "true for DMA");
module_param(use_dma_ppb, bool, S_IRUGO);
MODULE_PARM_DESC(use_dma_ppb, "true for DMA in packet per buffer mode");
module_param(use_dma_ppb_du, bool, S_IRUGO);
MODULE_PARM_DESC(use_dma_ppb_du,
"true for DMA in packet per buffer mode with descriptor update");
module_param(use_fullspeed, bool, S_IRUGO);
MODULE_PARM_DESC(use_fullspeed, "true for fullspeed only");
/*---------------------------------------------------------------------------*/
/* Prints UDC device registers and endpoint irq registers */
static void print_regs(struct udc *dev)
{
DBG(dev, "------- Device registers -------\n");
DBG(dev, "dev config = %08x\n", readl(&dev->regs->cfg));
DBG(dev, "dev control = %08x\n", readl(&dev->regs->ctl));
DBG(dev, "dev status = %08x\n", readl(&dev->regs->sts));
DBG(dev, "\n");
DBG(dev, "dev int's = %08x\n", readl(&dev->regs->irqsts));
DBG(dev, "dev intmask = %08x\n", readl(&dev->regs->irqmsk));
DBG(dev, "\n");
DBG(dev, "dev ep int's = %08x\n", readl(&dev->regs->ep_irqsts));
DBG(dev, "dev ep intmask = %08x\n", readl(&dev->regs->ep_irqmsk));
DBG(dev, "\n");
DBG(dev, "USE DMA = %d\n", use_dma);
if (use_dma && use_dma_ppb && !use_dma_ppb_du) {
DBG(dev, "DMA mode = PPBNDU (packet per buffer "
"WITHOUT desc. update)\n");
dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBNDU");
} else if (use_dma && use_dma_ppb && use_dma_ppb_du) {
DBG(dev, "DMA mode = PPBDU (packet per buffer "
"WITH desc. update)\n");
dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBDU");
}
if (use_dma && use_dma_bufferfill_mode) {
DBG(dev, "DMA mode = BF (buffer fill mode)\n");
dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "BF");
}
if (!use_dma)
dev_info(&dev->pdev->dev, "FIFO mode\n");
DBG(dev, "-------------------------------------------------------\n");
}
/* Masks unused interrupts */
static int udc_mask_unused_interrupts(struct udc *dev)
{
u32 tmp;
/* mask all dev interrupts */
tmp = AMD_BIT(UDC_DEVINT_SVC) |
AMD_BIT(UDC_DEVINT_ENUM) |
AMD_BIT(UDC_DEVINT_US) |
AMD_BIT(UDC_DEVINT_UR) |
AMD_BIT(UDC_DEVINT_ES) |
AMD_BIT(UDC_DEVINT_SI) |
AMD_BIT(UDC_DEVINT_SOF)|
AMD_BIT(UDC_DEVINT_SC);
writel(tmp, &dev->regs->irqmsk);
/* mask all ep interrupts */
writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqmsk);
return 0;
}
/* Enables endpoint 0 interrupts */
static int udc_enable_ep0_interrupts(struct udc *dev)
{
u32 tmp;
DBG(dev, "udc_enable_ep0_interrupts()\n");
/* read irq mask */
tmp = readl(&dev->regs->ep_irqmsk);
/* enable ep0 irq's */
tmp &= AMD_UNMASK_BIT(UDC_EPINT_IN_EP0)
& AMD_UNMASK_BIT(UDC_EPINT_OUT_EP0);
writel(tmp, &dev->regs->ep_irqmsk);
return 0;
}
/* Enables device interrupts for SET_INTF and SET_CONFIG */
static int udc_enable_dev_setup_interrupts(struct udc *dev)
{
u32 tmp;
DBG(dev, "enable device interrupts for setup data\n");
/* read irq mask */
tmp = readl(&dev->regs->irqmsk);
/* enable SET_INTERFACE, SET_CONFIG and other needed irq's */
tmp &= AMD_UNMASK_BIT(UDC_DEVINT_SI)
& AMD_UNMASK_BIT(UDC_DEVINT_SC)
& AMD_UNMASK_BIT(UDC_DEVINT_UR)
& AMD_UNMASK_BIT(UDC_DEVINT_SVC)
& AMD_UNMASK_BIT(UDC_DEVINT_ENUM);
writel(tmp, &dev->regs->irqmsk);
return 0;
}
/* Calculates fifo start of endpoint based on preceding endpoints */
static int udc_set_txfifo_addr(struct udc_ep *ep)
{
struct udc *dev;
u32 tmp;
int i;
if (!ep || !(ep->in))
return -EINVAL;
dev = ep->dev;
ep->txfifo = dev->txfifo;
/* traverse ep's */
for (i = 0; i < ep->num; i++) {
if (dev->ep[i].regs) {
/* read fifo size */
tmp = readl(&dev->ep[i].regs->bufin_framenum);
tmp = AMD_GETBITS(tmp, UDC_EPIN_BUFF_SIZE);
ep->txfifo += tmp;
}
}
return 0;
}
/* CNAK pending field: bit0 = ep0in, bit16 = ep0out */
static u32 cnak_pending;
static void UDC_QUEUE_CNAK(struct udc_ep *ep, unsigned num)
{
if (readl(&ep->regs->ctl) & AMD_BIT(UDC_EPCTL_NAK)) {
DBG(ep->dev, "NAK could not be cleared for ep%d\n", num);
cnak_pending |= 1 << (num);
ep->naking = 1;
} else
cnak_pending = cnak_pending & (~(1 << (num)));
}
/* Enables endpoint, is called by gadget driver */
static int
udc_ep_enable(struct usb_ep *usbep, const struct usb_endpoint_descriptor *desc)
{
struct udc_ep *ep;
struct udc *dev;
u32 tmp;
unsigned long iflags;
u8 udc_csr_epix;
unsigned maxpacket;
if (!usbep
|| usbep->name == ep0_string
|| !desc
|| desc->bDescriptorType != USB_DT_ENDPOINT)
return -EINVAL;
ep = container_of(usbep, struct udc_ep, ep);
dev = ep->dev;
DBG(dev, "udc_ep_enable() ep %d\n", ep->num);
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
spin_lock_irqsave(&dev->lock, iflags);
ep->ep.desc = desc;
ep->halted = 0;
/* set traffic type */
tmp = readl(&dev->ep[ep->num].regs->ctl);
tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_EPCTL_ET);
writel(tmp, &dev->ep[ep->num].regs->ctl);
/* set max packet size */
maxpacket = usb_endpoint_maxp(desc);
tmp = readl(&dev->ep[ep->num].regs->bufout_maxpkt);
tmp = AMD_ADDBITS(tmp, maxpacket, UDC_EP_MAX_PKT_SIZE);
ep->ep.maxpacket = maxpacket;
writel(tmp, &dev->ep[ep->num].regs->bufout_maxpkt);
/* IN ep */
if (ep->in) {
/* ep ix in UDC CSR register space */
udc_csr_epix = ep->num;
/* set buffer size (tx fifo entries) */
tmp = readl(&dev->ep[ep->num].regs->bufin_framenum);
/* double buffering: fifo size = 2 x max packet size */
tmp = AMD_ADDBITS(
tmp,
maxpacket * UDC_EPIN_BUFF_SIZE_MULT
/ UDC_DWORD_BYTES,
UDC_EPIN_BUFF_SIZE);
writel(tmp, &dev->ep[ep->num].regs->bufin_framenum);
/* calc. tx fifo base addr */
udc_set_txfifo_addr(ep);
/* flush fifo */
tmp = readl(&ep->regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_F);
writel(tmp, &ep->regs->ctl);
/* OUT ep */
} else {
/* ep ix in UDC CSR register space */
udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
/* set max packet size UDC CSR */
tmp = readl(&dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
tmp = AMD_ADDBITS(tmp, maxpacket,
UDC_CSR_NE_MAX_PKT);
writel(tmp, &dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
if (use_dma && !ep->in) {
/* alloc and init BNA dummy request */
ep->bna_dummy_req = udc_alloc_bna_dummy(ep);
ep->bna_occurred = 0;
}
if (ep->num != UDC_EP0OUT_IX)
dev->data_ep_enabled = 1;
}
/* set ep values */
tmp = readl(&dev->csr->ne[udc_csr_epix]);
/* max packet */
tmp = AMD_ADDBITS(tmp, maxpacket, UDC_CSR_NE_MAX_PKT);
/* ep number */
tmp = AMD_ADDBITS(tmp, desc->bEndpointAddress, UDC_CSR_NE_NUM);
/* ep direction */
tmp = AMD_ADDBITS(tmp, ep->in, UDC_CSR_NE_DIR);
/* ep type */
tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_CSR_NE_TYPE);
/* ep config */
tmp = AMD_ADDBITS(tmp, ep->dev->cur_config, UDC_CSR_NE_CFG);
/* ep interface */
tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf, UDC_CSR_NE_INTF);
/* ep alt */
tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt, UDC_CSR_NE_ALT);
/* write reg */
writel(tmp, &dev->csr->ne[udc_csr_epix]);
/* enable ep irq */
tmp = readl(&dev->regs->ep_irqmsk);
tmp &= AMD_UNMASK_BIT(ep->num);
writel(tmp, &dev->regs->ep_irqmsk);
/*
* clear NAK by writing CNAK
* avoid BNA for OUT DMA, don't clear NAK until DMA desc. written
*/
if (!use_dma || ep->in) {
tmp = readl(&ep->regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &ep->regs->ctl);
ep->naking = 0;
UDC_QUEUE_CNAK(ep, ep->num);
}
tmp = desc->bEndpointAddress;
DBG(dev, "%s enabled\n", usbep->name);
spin_unlock_irqrestore(&dev->lock, iflags);
return 0;
}
/* Resets endpoint */
static void ep_init(struct udc_regs __iomem *regs, struct udc_ep *ep)
{
u32 tmp;
VDBG(ep->dev, "ep-%d reset\n", ep->num);
ep->ep.desc = NULL;
ep->ep.ops = &udc_ep_ops;
INIT_LIST_HEAD(&ep->queue);
ep->ep.maxpacket = (u16) ~0;
/* set NAK */
tmp = readl(&ep->regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_SNAK);
writel(tmp, &ep->regs->ctl);
ep->naking = 1;
/* disable interrupt */
tmp = readl(&regs->ep_irqmsk);
tmp |= AMD_BIT(ep->num);
writel(tmp, &regs->ep_irqmsk);
if (ep->in) {
/* unset P and IN bit of potential former DMA */
tmp = readl(&ep->regs->ctl);
tmp &= AMD_UNMASK_BIT(UDC_EPCTL_P);
writel(tmp, &ep->regs->ctl);
tmp = readl(&ep->regs->sts);
tmp |= AMD_BIT(UDC_EPSTS_IN);
writel(tmp, &ep->regs->sts);
/* flush the fifo */
tmp = readl(&ep->regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_F);
writel(tmp, &ep->regs->ctl);
}
/* reset desc pointer */
writel(0, &ep->regs->desptr);
}
/* Disables endpoint, is called by gadget driver */
static int udc_ep_disable(struct usb_ep *usbep)
{
struct udc_ep *ep = NULL;
unsigned long iflags;
if (!usbep)
return -EINVAL;
ep = container_of(usbep, struct udc_ep, ep);
if (usbep->name == ep0_string || !ep->ep.desc)
return -EINVAL;
DBG(ep->dev, "Disable ep-%d\n", ep->num);
spin_lock_irqsave(&ep->dev->lock, iflags);
udc_free_request(&ep->ep, &ep->bna_dummy_req->req);
empty_req_queue(ep);
ep_init(ep->dev->regs, ep);
spin_unlock_irqrestore(&ep->dev->lock, iflags);
return 0;
}
/* Allocates request packet, called by gadget driver */
static struct usb_request *
udc_alloc_request(struct usb_ep *usbep, gfp_t gfp)
{
struct udc_request *req;
struct udc_data_dma *dma_desc;
struct udc_ep *ep;
if (!usbep)
return NULL;
ep = container_of(usbep, struct udc_ep, ep);
VDBG(ep->dev, "udc_alloc_req(): ep%d\n", ep->num);
req = kzalloc(sizeof(struct udc_request), gfp);
if (!req)
return NULL;
req->req.dma = DMA_DONT_USE;
INIT_LIST_HEAD(&req->queue);
if (ep->dma) {
/* ep0 in requests are allocated from data pool here */
dma_desc = pci_pool_alloc(ep->dev->data_requests, gfp,
&req->td_phys);
if (!dma_desc) {
kfree(req);
return NULL;
}
VDBG(ep->dev, "udc_alloc_req: req = %p dma_desc = %p, "
"td_phys = %lx\n",
req, dma_desc,
(unsigned long)req->td_phys);
/* prevent from using desc. - set HOST BUSY */
dma_desc->status = AMD_ADDBITS(dma_desc->status,
UDC_DMA_STP_STS_BS_HOST_BUSY,
UDC_DMA_STP_STS_BS);
dma_desc->bufptr = cpu_to_le32(DMA_DONT_USE);
req->td_data = dma_desc;
req->td_data_last = NULL;
req->chain_len = 1;
}
return &req->req;
}
/* Frees request packet, called by gadget driver */
static void
udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq)
{
struct udc_ep *ep;
struct udc_request *req;
if (!usbep || !usbreq)
return;
ep = container_of(usbep, struct udc_ep, ep);
req = container_of(usbreq, struct udc_request, req);
VDBG(ep->dev, "free_req req=%p\n", req);
BUG_ON(!list_empty(&req->queue));
if (req->td_data) {
VDBG(ep->dev, "req->td_data=%p\n", req->td_data);
/* free dma chain if created */
if (req->chain_len > 1)
udc_free_dma_chain(ep->dev, req);
pci_pool_free(ep->dev->data_requests, req->td_data,
req->td_phys);
}
kfree(req);
}
/* Init BNA dummy descriptor for HOST BUSY and pointing to itself */
static void udc_init_bna_dummy(struct udc_request *req)
{
if (req) {
/* set last bit */
req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
/* set next pointer to itself */
req->td_data->next = req->td_phys;
/* set HOST BUSY */
req->td_data->status
= AMD_ADDBITS(req->td_data->status,
UDC_DMA_STP_STS_BS_DMA_DONE,
UDC_DMA_STP_STS_BS);
#ifdef UDC_VERBOSE
pr_debug("bna desc = %p, sts = %08x\n",
req->td_data, req->td_data->status);
#endif
}
}
/* Allocate BNA dummy descriptor */
static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep)
{
struct udc_request *req = NULL;
struct usb_request *_req = NULL;
/* alloc the dummy request */
_req = udc_alloc_request(&ep->ep, GFP_ATOMIC);
if (_req) {
req = container_of(_req, struct udc_request, req);
ep->bna_dummy_req = req;
udc_init_bna_dummy(req);
}
return req;
}
/* Write data to TX fifo for IN packets */
static void
udc_txfifo_write(struct udc_ep *ep, struct usb_request *req)
{
u8 *req_buf;
u32 *buf;
int i, j;
unsigned bytes = 0;
unsigned remaining = 0;
if (!req || !ep)
return;
req_buf = req->buf + req->actual;
prefetch(req_buf);
remaining = req->length - req->actual;
buf = (u32 *) req_buf;
bytes = ep->ep.maxpacket;
if (bytes > remaining)
bytes = remaining;
/* dwords first */
for (i = 0; i < bytes / UDC_DWORD_BYTES; i++)
writel(*(buf + i), ep->txfifo);
/* remaining bytes must be written by byte access */
for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
writeb((u8)(*(buf + i) >> (j << UDC_BITS_PER_BYTE_SHIFT)),
ep->txfifo);
}
/* dummy write confirm */
writel(0, &ep->regs->confirm);
}
/* Read dwords from RX fifo for OUT transfers */
static int udc_rxfifo_read_dwords(struct udc *dev, u32 *buf, int dwords)
{
int i;
VDBG(dev, "udc_read_dwords(): %d dwords\n", dwords);
for (i = 0; i < dwords; i++)
*(buf + i) = readl(dev->rxfifo);
return 0;
}
/* Read bytes from RX fifo for OUT transfers */
static int udc_rxfifo_read_bytes(struct udc *dev, u8 *buf, int bytes)
{
int i, j;
u32 tmp;
VDBG(dev, "udc_read_bytes(): %d bytes\n", bytes);
/* dwords first */
for (i = 0; i < bytes / UDC_DWORD_BYTES; i++)
*((u32 *)(buf + (i<<2))) = readl(dev->rxfifo);
/* remaining bytes must be read by byte access */
if (bytes % UDC_DWORD_BYTES) {
tmp = readl(dev->rxfifo);
for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
*(buf + (i<<2) + j) = (u8)(tmp & UDC_BYTE_MASK);
tmp = tmp >> UDC_BITS_PER_BYTE;
}
}
return 0;
}
/* Read data from RX fifo for OUT transfers */
static int
udc_rxfifo_read(struct udc_ep *ep, struct udc_request *req)
{
u8 *buf;
unsigned buf_space;
unsigned bytes = 0;
unsigned finished = 0;
/* received number bytes */
bytes = readl(&ep->regs->sts);
bytes = AMD_GETBITS(bytes, UDC_EPSTS_RX_PKT_SIZE);
buf_space = req->req.length - req->req.actual;
buf = req->req.buf + req->req.actual;
if (bytes > buf_space) {
if ((buf_space % ep->ep.maxpacket) != 0) {
DBG(ep->dev,
"%s: rx %d bytes, rx-buf space = %d bytesn\n",
ep->ep.name, bytes, buf_space);
req->req.status = -EOVERFLOW;
}
bytes = buf_space;
}
req->req.actual += bytes;
/* last packet ? */
if (((bytes % ep->ep.maxpacket) != 0) || (!bytes)
|| ((req->req.actual == req->req.length) && !req->req.zero))
finished = 1;
/* read rx fifo bytes */
VDBG(ep->dev, "ep %s: rxfifo read %d bytes\n", ep->ep.name, bytes);
udc_rxfifo_read_bytes(ep->dev, buf, bytes);
return finished;
}
/* create/re-init a DMA descriptor or a DMA descriptor chain */
static int prep_dma(struct udc_ep *ep, struct udc_request *req, gfp_t gfp)
{
int retval = 0;
u32 tmp;
VDBG(ep->dev, "prep_dma\n");
VDBG(ep->dev, "prep_dma ep%d req->td_data=%p\n",
ep->num, req->td_data);
/* set buffer pointer */
req->td_data->bufptr = req->req.dma;
/* set last bit */
req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
/* build/re-init dma chain if maxpkt scatter mode, not for EP0 */
if (use_dma_ppb) {
retval = udc_create_dma_chain(ep, req, ep->ep.maxpacket, gfp);
if (retval != 0) {
if (retval == -ENOMEM)
DBG(ep->dev, "Out of DMA memory\n");
return retval;
}
if (ep->in) {
if (req->req.length == ep->ep.maxpacket) {
/* write tx bytes */
req->td_data->status =
AMD_ADDBITS(req->td_data->status,
ep->ep.maxpacket,
UDC_DMA_IN_STS_TXBYTES);
}
}
}
if (ep->in) {
VDBG(ep->dev, "IN: use_dma_ppb=%d req->req.len=%d "
"maxpacket=%d ep%d\n",
use_dma_ppb, req->req.length,
ep->ep.maxpacket, ep->num);
/*
* if bytes < max packet then tx bytes must
* be written in packet per buffer mode
*/
if (!use_dma_ppb || req->req.length < ep->ep.maxpacket
|| ep->num == UDC_EP0OUT_IX
|| ep->num == UDC_EP0IN_IX) {
/* write tx bytes */
req->td_data->status =
AMD_ADDBITS(req->td_data->status,
req->req.length,
UDC_DMA_IN_STS_TXBYTES);
/* reset frame num */
req->td_data->status =
AMD_ADDBITS(req->td_data->status,
0,
UDC_DMA_IN_STS_FRAMENUM);
}
/* set HOST BUSY */
req->td_data->status =
AMD_ADDBITS(req->td_data->status,
UDC_DMA_STP_STS_BS_HOST_BUSY,
UDC_DMA_STP_STS_BS);
} else {
VDBG(ep->dev, "OUT set host ready\n");
/* set HOST READY */
req->td_data->status =
AMD_ADDBITS(req->td_data->status,
UDC_DMA_STP_STS_BS_HOST_READY,
UDC_DMA_STP_STS_BS);
/* clear NAK by writing CNAK */
if (ep->naking) {
tmp = readl(&ep->regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &ep->regs->ctl);
ep->naking = 0;
UDC_QUEUE_CNAK(ep, ep->num);
}
}
return retval;
}
/* Completes request packet ... caller MUST hold lock */
static void
complete_req(struct udc_ep *ep, struct udc_request *req, int sts)
__releases(ep->dev->lock)
__acquires(ep->dev->lock)
{
struct udc *dev;
unsigned halted;
VDBG(ep->dev, "complete_req(): ep%d\n", ep->num);
dev = ep->dev;
/* unmap DMA */
if (ep->dma)
usb_gadget_unmap_request(&dev->gadget, &req->req, ep->in);
halted = ep->halted;
ep->halted = 1;
/* set new status if pending */
if (req->req.status == -EINPROGRESS)
req->req.status = sts;
/* remove from ep queue */
list_del_init(&req->queue);
VDBG(ep->dev, "req %p => complete %d bytes at %s with sts %d\n",
&req->req, req->req.length, ep->ep.name, sts);
spin_unlock(&dev->lock);
req->req.complete(&ep->ep, &req->req);
spin_lock(&dev->lock);
ep->halted = halted;
}
/* frees pci pool descriptors of a DMA chain */
static int udc_free_dma_chain(struct udc *dev, struct udc_request *req)
{
int ret_val = 0;
struct udc_data_dma *td;
struct udc_data_dma *td_last = NULL;
unsigned int i;
DBG(dev, "free chain req = %p\n", req);
/* do not free first desc., will be done by free for request */
td_last = req->td_data;
td = phys_to_virt(td_last->next);
for (i = 1; i < req->chain_len; i++) {
pci_pool_free(dev->data_requests, td,
(dma_addr_t) td_last->next);
td_last = td;
td = phys_to_virt(td_last->next);
}
return ret_val;
}
/* Iterates to the end of a DMA chain and returns last descriptor */
static struct udc_data_dma *udc_get_last_dma_desc(struct udc_request *req)
{
struct udc_data_dma *td;
td = req->td_data;
while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L)))
td = phys_to_virt(td->next);
return td;
}
/* Iterates to the end of a DMA chain and counts bytes received */
static u32 udc_get_ppbdu_rxbytes(struct udc_request *req)
{
struct udc_data_dma *td;
u32 count;
td = req->td_data;
/* received number bytes */
count = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_RXBYTES);
while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) {
td = phys_to_virt(td->next);
/* received number bytes */
if (td) {
count += AMD_GETBITS(td->status,
UDC_DMA_OUT_STS_RXBYTES);
}
}
return count;
}
/* Creates or re-inits a DMA chain */
static int udc_create_dma_chain(
struct udc_ep *ep,
struct udc_request *req,
unsigned long buf_len, gfp_t gfp_flags
)
{
unsigned long bytes = req->req.length;
unsigned int i;
dma_addr_t dma_addr;
struct udc_data_dma *td = NULL;
struct udc_data_dma *last = NULL;
unsigned long txbytes;
unsigned create_new_chain = 0;
unsigned len;
VDBG(ep->dev, "udc_create_dma_chain: bytes=%ld buf_len=%ld\n",
bytes, buf_len);
dma_addr = DMA_DONT_USE;
/* unset L bit in first desc for OUT */
if (!ep->in)
req->td_data->status &= AMD_CLEAR_BIT(UDC_DMA_IN_STS_L);
/* alloc only new desc's if not already available */
len = req->req.length / ep->ep.maxpacket;
if (req->req.length % ep->ep.maxpacket)
len++;
if (len > req->chain_len) {
/* shorter chain already allocated before */
if (req->chain_len > 1)
udc_free_dma_chain(ep->dev, req);
req->chain_len = len;
create_new_chain = 1;
}
td = req->td_data;
/* gen. required number of descriptors and buffers */
for (i = buf_len; i < bytes; i += buf_len) {
/* create or determine next desc. */
if (create_new_chain) {
td = pci_pool_alloc(ep->dev->data_requests,
gfp_flags, &dma_addr);
if (!td)
return -ENOMEM;
td->status = 0;
} else if (i == buf_len) {
/* first td */
td = (struct udc_data_dma *) phys_to_virt(
req->td_data->next);
td->status = 0;
} else {
td = (struct udc_data_dma *) phys_to_virt(last->next);
td->status = 0;
}
if (td)
td->bufptr = req->req.dma + i; /* assign buffer */
else
break;
/* short packet ? */
if ((bytes - i) >= buf_len) {
txbytes = buf_len;
} else {
/* short packet */
txbytes = bytes - i;
}
/* link td and assign tx bytes */
if (i == buf_len) {
if (create_new_chain)
req->td_data->next = dma_addr;
/*
else
req->td_data->next = virt_to_phys(td);
*/
/* write tx bytes */
if (ep->in) {
/* first desc */
req->td_data->status =
AMD_ADDBITS(req->td_data->status,
ep->ep.maxpacket,
UDC_DMA_IN_STS_TXBYTES);
/* second desc */
td->status = AMD_ADDBITS(td->status,
txbytes,
UDC_DMA_IN_STS_TXBYTES);
}
} else {
if (create_new_chain)
last->next = dma_addr;
/*
else
last->next = virt_to_phys(td);
*/
if (ep->in) {
/* write tx bytes */
td->status = AMD_ADDBITS(td->status,
txbytes,
UDC_DMA_IN_STS_TXBYTES);
}
}
last = td;
}
/* set last bit */
if (td) {
td->status |= AMD_BIT(UDC_DMA_IN_STS_L);
/* last desc. points to itself */
req->td_data_last = td;
}
return 0;
}
/* Enabling RX DMA */
static void udc_set_rde(struct udc *dev)
{
u32 tmp;
VDBG(dev, "udc_set_rde()\n");
/* stop RDE timer */
if (timer_pending(&udc_timer)) {
set_rde = 0;
mod_timer(&udc_timer, jiffies - 1);
}
/* set RDE */
tmp = readl(&dev->regs->ctl);
tmp |= AMD_BIT(UDC_DEVCTL_RDE);
writel(tmp, &dev->regs->ctl);
}
/* Queues a request packet, called by gadget driver */
static int
udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp)
{
int retval = 0;
u8 open_rxfifo = 0;
unsigned long iflags;
struct udc_ep *ep;
struct udc_request *req;
struct udc *dev;
u32 tmp;
/* check the inputs */
req = container_of(usbreq, struct udc_request, req);
if (!usbep || !usbreq || !usbreq->complete || !usbreq->buf
|| !list_empty(&req->queue))
return -EINVAL;
ep = container_of(usbep, struct udc_ep, ep);
if (!ep->ep.desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
return -EINVAL;
VDBG(ep->dev, "udc_queue(): ep%d-in=%d\n", ep->num, ep->in);
dev = ep->dev;
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
/* map dma (usually done before) */
if (ep->dma) {
VDBG(dev, "DMA map req %p\n", req);
retval = usb_gadget_map_request(&udc->gadget, usbreq, ep->in);
if (retval)
return retval;
}
VDBG(dev, "%s queue req %p, len %d req->td_data=%p buf %p\n",
usbep->name, usbreq, usbreq->length,
req->td_data, usbreq->buf);
spin_lock_irqsave(&dev->lock, iflags);
usbreq->actual = 0;
usbreq->status = -EINPROGRESS;
req->dma_done = 0;
/* on empty queue just do first transfer */
if (list_empty(&ep->queue)) {
/* zlp */
if (usbreq->length == 0) {
/* IN zlp's are handled by hardware */
complete_req(ep, req, 0);
VDBG(dev, "%s: zlp\n", ep->ep.name);
/*
* if set_config or set_intf is waiting for ack by zlp
* then set CSR_DONE
*/
if (dev->set_cfg_not_acked) {
tmp = readl(&dev->regs->ctl);
tmp |= AMD_BIT(UDC_DEVCTL_CSR_DONE);
writel(tmp, &dev->regs->ctl);
dev->set_cfg_not_acked = 0;
}
/* setup command is ACK'ed now by zlp */
if (dev->waiting_zlp_ack_ep0in) {
/* clear NAK by writing CNAK in EP0_IN */
tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
dev->ep[UDC_EP0IN_IX].naking = 0;
UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX],
UDC_EP0IN_IX);
dev->waiting_zlp_ack_ep0in = 0;
}
goto finished;
}
if (ep->dma) {
retval = prep_dma(ep, req, gfp);
if (retval != 0)
goto finished;
/* write desc pointer to enable DMA */
if (ep->in) {
/* set HOST READY */
req->td_data->status =
AMD_ADDBITS(req->td_data->status,
UDC_DMA_IN_STS_BS_HOST_READY,
UDC_DMA_IN_STS_BS);
}
/* disabled rx dma while descriptor update */
if (!ep->in) {
/* stop RDE timer */
if (timer_pending(&udc_timer)) {
set_rde = 0;
mod_timer(&udc_timer, jiffies - 1);
}
/* clear RDE */
tmp = readl(&dev->regs->ctl);
tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
writel(tmp, &dev->regs->ctl);
open_rxfifo = 1;
/*
* if BNA occurred then let BNA dummy desc.
* point to current desc.
*/
if (ep->bna_occurred) {
VDBG(dev, "copy to BNA dummy desc.\n");
memcpy(ep->bna_dummy_req->td_data,
req->td_data,
sizeof(struct udc_data_dma));
}
}
/* write desc pointer */
writel(req->td_phys, &ep->regs->desptr);
/* clear NAK by writing CNAK */
if (ep->naking) {
tmp = readl(&ep->regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &ep->regs->ctl);
ep->naking = 0;
UDC_QUEUE_CNAK(ep, ep->num);
}
if (ep->in) {
/* enable ep irq */
tmp = readl(&dev->regs->ep_irqmsk);
tmp &= AMD_UNMASK_BIT(ep->num);
writel(tmp, &dev->regs->ep_irqmsk);
}
} else if (ep->in) {
/* enable ep irq */
tmp = readl(&dev->regs->ep_irqmsk);
tmp &= AMD_UNMASK_BIT(ep->num);
writel(tmp, &dev->regs->ep_irqmsk);
}
} else if (ep->dma) {
/*
* prep_dma not used for OUT ep's, this is not possible
* for PPB modes, because of chain creation reasons
*/
if (ep->in) {
retval = prep_dma(ep, req, gfp);
if (retval != 0)
goto finished;
}
}
VDBG(dev, "list_add\n");
/* add request to ep queue */
if (req) {
list_add_tail(&req->queue, &ep->queue);
/* open rxfifo if out data queued */
if (open_rxfifo) {
/* enable DMA */
req->dma_going = 1;
udc_set_rde(dev);
if (ep->num != UDC_EP0OUT_IX)
dev->data_ep_queued = 1;
}
/* stop OUT naking */
if (!ep->in) {
if (!use_dma && udc_rxfifo_pending) {
DBG(dev, "udc_queue(): pending bytes in "
"rxfifo after nyet\n");
/*
* read pending bytes afer nyet:
* referring to isr
*/
if (udc_rxfifo_read(ep, req)) {
/* finish */
complete_req(ep, req, 0);
}
udc_rxfifo_pending = 0;
}
}
}
finished:
spin_unlock_irqrestore(&dev->lock, iflags);
return retval;
}
/* Empty request queue of an endpoint; caller holds spinlock */
static void empty_req_queue(struct udc_ep *ep)
{
struct udc_request *req;
ep->halted = 1;
while (!list_empty(&ep->queue)) {
req = list_entry(ep->queue.next,
struct udc_request,
queue);
complete_req(ep, req, -ESHUTDOWN);
}
}
/* Dequeues a request packet, called by gadget driver */
static int udc_dequeue(struct usb_ep *usbep, struct usb_request *usbreq)
{
struct udc_ep *ep;
struct udc_request *req;
unsigned halted;
unsigned long iflags;
ep = container_of(usbep, struct udc_ep, ep);
if (!usbep || !usbreq || (!ep->ep.desc && (ep->num != 0
&& ep->num != UDC_EP0OUT_IX)))
return -EINVAL;
req = container_of(usbreq, struct udc_request, req);
spin_lock_irqsave(&ep->dev->lock, iflags);
halted = ep->halted;
ep->halted = 1;
/* request in processing or next one */
if (ep->queue.next == &req->queue) {
if (ep->dma && req->dma_going) {
if (ep->in)
ep->cancel_transfer = 1;
else {
u32 tmp;
u32 dma_sts;
/* stop potential receive DMA */
tmp = readl(&udc->regs->ctl);
writel(tmp & AMD_UNMASK_BIT(UDC_DEVCTL_RDE),
&udc->regs->ctl);
/*
* Cancel transfer later in ISR
* if descriptor was touched.
*/
dma_sts = AMD_GETBITS(req->td_data->status,
UDC_DMA_OUT_STS_BS);
if (dma_sts != UDC_DMA_OUT_STS_BS_HOST_READY)
ep->cancel_transfer = 1;
else {
udc_init_bna_dummy(ep->req);
writel(ep->bna_dummy_req->td_phys,
&ep->regs->desptr);
}
writel(tmp, &udc->regs->ctl);
}
}
}
complete_req(ep, req, -ECONNRESET);
ep->halted = halted;
spin_unlock_irqrestore(&ep->dev->lock, iflags);
return 0;
}
/* Halt or clear halt of endpoint */
static int
udc_set_halt(struct usb_ep *usbep, int halt)
{
struct udc_ep *ep;
u32 tmp;
unsigned long iflags;
int retval = 0;
if (!usbep)
return -EINVAL;
pr_debug("set_halt %s: halt=%d\n", usbep->name, halt);
ep = container_of(usbep, struct udc_ep, ep);
if (!ep->ep.desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
return -EINVAL;
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
spin_lock_irqsave(&udc_stall_spinlock, iflags);
/* halt or clear halt */
if (halt) {
if (ep->num == 0)
ep->dev->stall_ep0in = 1;
else {
/*
* set STALL
* rxfifo empty not taken into acount
*/
tmp = readl(&ep->regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_S);
writel(tmp, &ep->regs->ctl);
ep->halted = 1;
/* setup poll timer */
if (!timer_pending(&udc_pollstall_timer)) {
udc_pollstall_timer.expires = jiffies +
HZ * UDC_POLLSTALL_TIMER_USECONDS
/ (1000 * 1000);
if (!stop_pollstall_timer) {
DBG(ep->dev, "start polltimer\n");
add_timer(&udc_pollstall_timer);
}
}
}
} else {
/* ep is halted by set_halt() before */
if (ep->halted) {
tmp = readl(&ep->regs->ctl);
/* clear stall bit */
tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
/* clear NAK by writing CNAK */
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &ep->regs->ctl);
ep->halted = 0;
UDC_QUEUE_CNAK(ep, ep->num);
}
}
spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
return retval;
}
/* gadget interface */
static const struct usb_ep_ops udc_ep_ops = {
.enable = udc_ep_enable,
.disable = udc_ep_disable,
.alloc_request = udc_alloc_request,
.free_request = udc_free_request,
.queue = udc_queue,
.dequeue = udc_dequeue,
.set_halt = udc_set_halt,
/* fifo ops not implemented */
};
/*-------------------------------------------------------------------------*/
/* Get frame counter (not implemented) */
static int udc_get_frame(struct usb_gadget *gadget)
{
return -EOPNOTSUPP;
}
/* Remote wakeup gadget interface */
static int udc_wakeup(struct usb_gadget *gadget)
{
struct udc *dev;
if (!gadget)
return -EINVAL;
dev = container_of(gadget, struct udc, gadget);
udc_remote_wakeup(dev);
return 0;
}
static int amd5536_start(struct usb_gadget_driver *driver,
int (*bind)(struct usb_gadget *, struct usb_gadget_driver *));
static int amd5536_stop(struct usb_gadget_driver *driver);
/* gadget operations */
static const struct usb_gadget_ops udc_ops = {
.wakeup = udc_wakeup,
.get_frame = udc_get_frame,
.start = amd5536_start,
.stop = amd5536_stop,
};
/* Setups endpoint parameters, adds endpoints to linked list */
static void make_ep_lists(struct udc *dev)
{
/* make gadget ep lists */
INIT_LIST_HEAD(&dev->gadget.ep_list);
list_add_tail(&dev->ep[UDC_EPIN_STATUS_IX].ep.ep_list,
&dev->gadget.ep_list);
list_add_tail(&dev->ep[UDC_EPIN_IX].ep.ep_list,
&dev->gadget.ep_list);
list_add_tail(&dev->ep[UDC_EPOUT_IX].ep.ep_list,
&dev->gadget.ep_list);
/* fifo config */
dev->ep[UDC_EPIN_STATUS_IX].fifo_depth = UDC_EPIN_SMALLINT_BUFF_SIZE;
if (dev->gadget.speed == USB_SPEED_FULL)
dev->ep[UDC_EPIN_IX].fifo_depth = UDC_FS_EPIN_BUFF_SIZE;
else if (dev->gadget.speed == USB_SPEED_HIGH)
dev->ep[UDC_EPIN_IX].fifo_depth = hs_tx_buf;
dev->ep[UDC_EPOUT_IX].fifo_depth = UDC_RXFIFO_SIZE;
}
/* init registers at driver load time */
static int startup_registers(struct udc *dev)
{
u32 tmp;
/* init controller by soft reset */
udc_soft_reset(dev);
/* mask not needed interrupts */
udc_mask_unused_interrupts(dev);
/* put into initial config */
udc_basic_init(dev);
/* link up all endpoints */
udc_setup_endpoints(dev);
/* program speed */
tmp = readl(&dev->regs->cfg);
if (use_fullspeed)
tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
else
tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_HS, UDC_DEVCFG_SPD);
writel(tmp, &dev->regs->cfg);
return 0;
}
/* Inits UDC context */
static void udc_basic_init(struct udc *dev)
{
u32 tmp;
DBG(dev, "udc_basic_init()\n");
dev->gadget.speed = USB_SPEED_UNKNOWN;
/* stop RDE timer */
if (timer_pending(&udc_timer)) {
set_rde = 0;
mod_timer(&udc_timer, jiffies - 1);
}
/* stop poll stall timer */
if (timer_pending(&udc_pollstall_timer))
mod_timer(&udc_pollstall_timer, jiffies - 1);
/* disable DMA */
tmp = readl(&dev->regs->ctl);
tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_TDE);
writel(tmp, &dev->regs->ctl);
/* enable dynamic CSR programming */
tmp = readl(&dev->regs->cfg);
tmp |= AMD_BIT(UDC_DEVCFG_CSR_PRG);
/* set self powered */
tmp |= AMD_BIT(UDC_DEVCFG_SP);
/* set remote wakeupable */
tmp |= AMD_BIT(UDC_DEVCFG_RWKP);
writel(tmp, &dev->regs->cfg);
make_ep_lists(dev);
dev->data_ep_enabled = 0;
dev->data_ep_queued = 0;
}
/* Sets initial endpoint parameters */
static void udc_setup_endpoints(struct udc *dev)
{
struct udc_ep *ep;
u32 tmp;
u32 reg;
DBG(dev, "udc_setup_endpoints()\n");
/* read enum speed */
tmp = readl(&dev->regs->sts);
tmp = AMD_GETBITS(tmp, UDC_DEVSTS_ENUM_SPEED);
if (tmp == UDC_DEVSTS_ENUM_SPEED_HIGH)
dev->gadget.speed = USB_SPEED_HIGH;
else if (tmp == UDC_DEVSTS_ENUM_SPEED_FULL)
dev->gadget.speed = USB_SPEED_FULL;
/* set basic ep parameters */
for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
ep = &dev->ep[tmp];
ep->dev = dev;
ep->ep.name = ep_string[tmp];
ep->num = tmp;
/* txfifo size is calculated at enable time */
ep->txfifo = dev->txfifo;
/* fifo size */
if (tmp < UDC_EPIN_NUM) {
ep->fifo_depth = UDC_TXFIFO_SIZE;
ep->in = 1;
} else {
ep->fifo_depth = UDC_RXFIFO_SIZE;
ep->in = 0;
}
ep->regs = &dev->ep_regs[tmp];
/*
* ep will be reset only if ep was not enabled before to avoid
* disabling ep interrupts when ENUM interrupt occurs but ep is
* not enabled by gadget driver
*/
if (!ep->ep.desc)
ep_init(dev->regs, ep);
if (use_dma) {
/*
* ep->dma is not really used, just to indicate that
* DMA is active: remove this
* dma regs = dev control regs
*/
ep->dma = &dev->regs->ctl;
/* nak OUT endpoints until enable - not for ep0 */
if (tmp != UDC_EP0IN_IX && tmp != UDC_EP0OUT_IX
&& tmp > UDC_EPIN_NUM) {
/* set NAK */
reg = readl(&dev->ep[tmp].regs->ctl);
reg |= AMD_BIT(UDC_EPCTL_SNAK);
writel(reg, &dev->ep[tmp].regs->ctl);
dev->ep[tmp].naking = 1;
}
}
}
/* EP0 max packet */
if (dev->gadget.speed == USB_SPEED_FULL) {
dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_FS_EP0IN_MAX_PKT_SIZE;
dev->ep[UDC_EP0OUT_IX].ep.maxpacket =
UDC_FS_EP0OUT_MAX_PKT_SIZE;
} else if (dev->gadget.speed == USB_SPEED_HIGH) {
dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_EP0IN_MAX_PKT_SIZE;
dev->ep[UDC_EP0OUT_IX].ep.maxpacket = UDC_EP0OUT_MAX_PKT_SIZE;
}
/*
* with suspend bug workaround, ep0 params for gadget driver
* are set at gadget driver bind() call
*/
dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
dev->ep[UDC_EP0IN_IX].halted = 0;
INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
/* init cfg/alt/int */
dev->cur_config = 0;
dev->cur_intf = 0;
dev->cur_alt = 0;
}
/* Bringup after Connect event, initial bringup to be ready for ep0 events */
static void usb_connect(struct udc *dev)
{
dev_info(&dev->pdev->dev, "USB Connect\n");
dev->connected = 1;
/* put into initial config */
udc_basic_init(dev);
/* enable device setup interrupts */
udc_enable_dev_setup_interrupts(dev);
}
/*
* Calls gadget with disconnect event and resets the UDC and makes
* initial bringup to be ready for ep0 events
*/
static void usb_disconnect(struct udc *dev)
{
dev_info(&dev->pdev->dev, "USB Disconnect\n");
dev->connected = 0;
/* mask interrupts */
udc_mask_unused_interrupts(dev);
/* REVISIT there doesn't seem to be a point to having this
* talk to a tasklet ... do it directly, we already hold
* the spinlock needed to process the disconnect.
*/
tasklet_schedule(&disconnect_tasklet);
}
/* Tasklet for disconnect to be outside of interrupt context */
static void udc_tasklet_disconnect(unsigned long par)
{
struct udc *dev = (struct udc *)(*((struct udc **) par));
u32 tmp;
DBG(dev, "Tasklet disconnect\n");
spin_lock_irq(&dev->lock);
if (dev->driver) {
spin_unlock(&dev->lock);
dev->driver->disconnect(&dev->gadget);
spin_lock(&dev->lock);
/* empty queues */
for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
empty_req_queue(&dev->ep[tmp]);
}
/* disable ep0 */
ep_init(dev->regs,
&dev->ep[UDC_EP0IN_IX]);
if (!soft_reset_occured) {
/* init controller by soft reset */
udc_soft_reset(dev);
soft_reset_occured++;
}
/* re-enable dev interrupts */
udc_enable_dev_setup_interrupts(dev);
/* back to full speed ? */
if (use_fullspeed) {
tmp = readl(&dev->regs->cfg);
tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
writel(tmp, &dev->regs->cfg);
}
spin_unlock_irq(&dev->lock);
}
/* Reset the UDC core */
static void udc_soft_reset(struct udc *dev)
{
unsigned long flags;
DBG(dev, "Soft reset\n");
/*
* reset possible waiting interrupts, because int.
* status is lost after soft reset,
* ep int. status reset
*/
writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqsts);
/* device int. status reset */
writel(UDC_DEV_MSK_DISABLE, &dev->regs->irqsts);
spin_lock_irqsave(&udc_irq_spinlock, flags);
writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
readl(&dev->regs->cfg);
spin_unlock_irqrestore(&udc_irq_spinlock, flags);
}
/* RDE timer callback to set RDE bit */
static void udc_timer_function(unsigned long v)
{
u32 tmp;
spin_lock_irq(&udc_irq_spinlock);
if (set_rde > 0) {
/*
* open the fifo if fifo was filled on last timer call
* conditionally
*/
if (set_rde > 1) {
/* set RDE to receive setup data */
tmp = readl(&udc->regs->ctl);
tmp |= AMD_BIT(UDC_DEVCTL_RDE);
writel(tmp, &udc->regs->ctl);
set_rde = -1;
} else if (readl(&udc->regs->sts)
& AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
/*
* if fifo empty setup polling, do not just
* open the fifo
*/
udc_timer.expires = jiffies + HZ/UDC_RDE_TIMER_DIV;
if (!stop_timer)
add_timer(&udc_timer);
} else {
/*
* fifo contains data now, setup timer for opening
* the fifo when timer expires to be able to receive
* setup packets, when data packets gets queued by
* gadget layer then timer will forced to expire with
* set_rde=0 (RDE is set in udc_queue())
*/
set_rde++;
/* debug: lhadmot_timer_start = 221070 */
udc_timer.expires = jiffies + HZ*UDC_RDE_TIMER_SECONDS;
if (!stop_timer)
add_timer(&udc_timer);
}
} else
set_rde = -1; /* RDE was set by udc_queue() */
spin_unlock_irq(&udc_irq_spinlock);
if (stop_timer)
complete(&on_exit);
}
/* Handle halt state, used in stall poll timer */
static void udc_handle_halt_state(struct udc_ep *ep)
{
u32 tmp;
/* set stall as long not halted */
if (ep->halted == 1) {
tmp = readl(&ep->regs->ctl);
/* STALL cleared ? */
if (!(tmp & AMD_BIT(UDC_EPCTL_S))) {
/*
* FIXME: MSC spec requires that stall remains
* even on receivng of CLEAR_FEATURE HALT. So
* we would set STALL again here to be compliant.
* But with current mass storage drivers this does
* not work (would produce endless host retries).
* So we clear halt on CLEAR_FEATURE.
*
DBG(ep->dev, "ep %d: set STALL again\n", ep->num);
tmp |= AMD_BIT(UDC_EPCTL_S);
writel(tmp, &ep->regs->ctl);*/
/* clear NAK by writing CNAK */
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &ep->regs->ctl);
ep->halted = 0;
UDC_QUEUE_CNAK(ep, ep->num);
}
}
}
/* Stall timer callback to poll S bit and set it again after */
static void udc_pollstall_timer_function(unsigned long v)
{
struct udc_ep *ep;
int halted = 0;
spin_lock_irq(&udc_stall_spinlock);
/*
* only one IN and OUT endpoints are handled
* IN poll stall
*/
ep = &udc->ep[UDC_EPIN_IX];
udc_handle_halt_state(ep);
if (ep->halted)
halted = 1;
/* OUT poll stall */
ep = &udc->ep[UDC_EPOUT_IX];
udc_handle_halt_state(ep);
if (ep->halted)
halted = 1;
/* setup timer again when still halted */
if (!stop_pollstall_timer && halted) {
udc_pollstall_timer.expires = jiffies +
HZ * UDC_POLLSTALL_TIMER_USECONDS
/ (1000 * 1000);
add_timer(&udc_pollstall_timer);
}
spin_unlock_irq(&udc_stall_spinlock);
if (stop_pollstall_timer)
complete(&on_pollstall_exit);
}
/* Inits endpoint 0 so that SETUP packets are processed */
static void activate_control_endpoints(struct udc *dev)
{
u32 tmp;
DBG(dev, "activate_control_endpoints\n");
/* flush fifo */
tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_F);
writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
/* set ep0 directions */
dev->ep[UDC_EP0IN_IX].in = 1;
dev->ep[UDC_EP0OUT_IX].in = 0;
/* set buffer size (tx fifo entries) of EP0_IN */
tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
if (dev->gadget.speed == USB_SPEED_FULL)
tmp = AMD_ADDBITS(tmp, UDC_FS_EPIN0_BUFF_SIZE,
UDC_EPIN_BUFF_SIZE);
else if (dev->gadget.speed == USB_SPEED_HIGH)
tmp = AMD_ADDBITS(tmp, UDC_EPIN0_BUFF_SIZE,
UDC_EPIN_BUFF_SIZE);
writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
/* set max packet size of EP0_IN */
tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
if (dev->gadget.speed == USB_SPEED_FULL)
tmp = AMD_ADDBITS(tmp, UDC_FS_EP0IN_MAX_PKT_SIZE,
UDC_EP_MAX_PKT_SIZE);
else if (dev->gadget.speed == USB_SPEED_HIGH)
tmp = AMD_ADDBITS(tmp, UDC_EP0IN_MAX_PKT_SIZE,
UDC_EP_MAX_PKT_SIZE);
writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
/* set max packet size of EP0_OUT */
tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
if (dev->gadget.speed == USB_SPEED_FULL)
tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
UDC_EP_MAX_PKT_SIZE);
else if (dev->gadget.speed == USB_SPEED_HIGH)
tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
UDC_EP_MAX_PKT_SIZE);
writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
/* set max packet size of EP0 in UDC CSR */
tmp = readl(&dev->csr->ne[0]);
if (dev->gadget.speed == USB_SPEED_FULL)
tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
UDC_CSR_NE_MAX_PKT);
else if (dev->gadget.speed == USB_SPEED_HIGH)
tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
UDC_CSR_NE_MAX_PKT);
writel(tmp, &dev->csr->ne[0]);
if (use_dma) {
dev->ep[UDC_EP0OUT_IX].td->status |=
AMD_BIT(UDC_DMA_OUT_STS_L);
/* write dma desc address */
writel(dev->ep[UDC_EP0OUT_IX].td_stp_dma,
&dev->ep[UDC_EP0OUT_IX].regs->subptr);
writel(dev->ep[UDC_EP0OUT_IX].td_phys,
&dev->ep[UDC_EP0OUT_IX].regs->desptr);
/* stop RDE timer */
if (timer_pending(&udc_timer)) {
set_rde = 0;
mod_timer(&udc_timer, jiffies - 1);
}
/* stop pollstall timer */
if (timer_pending(&udc_pollstall_timer))
mod_timer(&udc_pollstall_timer, jiffies - 1);
/* enable DMA */
tmp = readl(&dev->regs->ctl);
tmp |= AMD_BIT(UDC_DEVCTL_MODE)
| AMD_BIT(UDC_DEVCTL_RDE)
| AMD_BIT(UDC_DEVCTL_TDE);
if (use_dma_bufferfill_mode)
tmp |= AMD_BIT(UDC_DEVCTL_BF);
else if (use_dma_ppb_du)
tmp |= AMD_BIT(UDC_DEVCTL_DU);
writel(tmp, &dev->regs->ctl);
}
/* clear NAK by writing CNAK for EP0IN */
tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
dev->ep[UDC_EP0IN_IX].naking = 0;
UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
/* clear NAK by writing CNAK for EP0OUT */
tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
dev->ep[UDC_EP0OUT_IX].naking = 0;
UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
}
/* Make endpoint 0 ready for control traffic */
static int setup_ep0(struct udc *dev)
{
activate_control_endpoints(dev);
/* enable ep0 interrupts */
udc_enable_ep0_interrupts(dev);
/* enable device setup interrupts */
udc_enable_dev_setup_interrupts(dev);
return 0;
}
/* Called by gadget driver to register itself */
static int amd5536_start(struct usb_gadget_driver *driver,
int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
{
struct udc *dev = udc;
int retval;
u32 tmp;
if (!driver || !bind || !driver->setup
|| driver->max_speed < USB_SPEED_HIGH)
return -EINVAL;
if (!dev)
return -ENODEV;
if (dev->driver)
return -EBUSY;
driver->driver.bus = NULL;
dev->driver = driver;
dev->gadget.dev.driver = &driver->driver;
retval = bind(&dev->gadget, driver);
/* Some gadget drivers use both ep0 directions.
* NOTE: to gadget driver, ep0 is just one endpoint...
*/
dev->ep[UDC_EP0OUT_IX].ep.driver_data =
dev->ep[UDC_EP0IN_IX].ep.driver_data;
if (retval) {
DBG(dev, "binding to %s returning %d\n",
driver->driver.name, retval);
dev->driver = NULL;
dev->gadget.dev.driver = NULL;
return retval;
}
/* get ready for ep0 traffic */
setup_ep0(dev);
/* clear SD */
tmp = readl(&dev->regs->ctl);
tmp = tmp & AMD_CLEAR_BIT(UDC_DEVCTL_SD);
writel(tmp, &dev->regs->ctl);
usb_connect(dev);
return 0;
}
/* shutdown requests and disconnect from gadget */
static void
shutdown(struct udc *dev, struct usb_gadget_driver *driver)
__releases(dev->lock)
__acquires(dev->lock)
{
int tmp;
if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
spin_unlock(&dev->lock);
driver->disconnect(&dev->gadget);
spin_lock(&dev->lock);
}
/* empty queues and init hardware */
udc_basic_init(dev);
for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
empty_req_queue(&dev->ep[tmp]);
udc_setup_endpoints(dev);
}
/* Called by gadget driver to unregister itself */
static int amd5536_stop(struct usb_gadget_driver *driver)
{
struct udc *dev = udc;
unsigned long flags;
u32 tmp;
if (!dev)
return -ENODEV;
if (!driver || driver != dev->driver || !driver->unbind)
return -EINVAL;
spin_lock_irqsave(&dev->lock, flags);
udc_mask_unused_interrupts(dev);
shutdown(dev, driver);
spin_unlock_irqrestore(&dev->lock, flags);
driver->unbind(&dev->gadget);
dev->gadget.dev.driver = NULL;
dev->driver = NULL;
/* set SD */
tmp = readl(&dev->regs->ctl);
tmp |= AMD_BIT(UDC_DEVCTL_SD);
writel(tmp, &dev->regs->ctl);
DBG(dev, "%s: unregistered\n", driver->driver.name);
return 0;
}
/* Clear pending NAK bits */
static void udc_process_cnak_queue(struct udc *dev)
{
u32 tmp;
u32 reg;
/* check epin's */
DBG(dev, "CNAK pending queue processing\n");
for (tmp = 0; tmp < UDC_EPIN_NUM_USED; tmp++) {
if (cnak_pending & (1 << tmp)) {
DBG(dev, "CNAK pending for ep%d\n", tmp);
/* clear NAK by writing CNAK */
reg = readl(&dev->ep[tmp].regs->ctl);
reg |= AMD_BIT(UDC_EPCTL_CNAK);
writel(reg, &dev->ep[tmp].regs->ctl);
dev->ep[tmp].naking = 0;
UDC_QUEUE_CNAK(&dev->ep[tmp], dev->ep[tmp].num);
}
}
/* ... and ep0out */
if (cnak_pending & (1 << UDC_EP0OUT_IX)) {
DBG(dev, "CNAK pending for ep%d\n", UDC_EP0OUT_IX);
/* clear NAK by writing CNAK */
reg = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
reg |= AMD_BIT(UDC_EPCTL_CNAK);
writel(reg, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
dev->ep[UDC_EP0OUT_IX].naking = 0;
UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX],
dev->ep[UDC_EP0OUT_IX].num);
}
}
/* Enabling RX DMA after setup packet */
static void udc_ep0_set_rde(struct udc *dev)
{
if (use_dma) {
/*
* only enable RXDMA when no data endpoint enabled
* or data is queued
*/
if (!dev->data_ep_enabled || dev->data_ep_queued) {
udc_set_rde(dev);
} else {
/*
* setup timer for enabling RDE (to not enable
* RXFIFO DMA for data endpoints to early)
*/
if (set_rde != 0 && !timer_pending(&udc_timer)) {
udc_timer.expires =
jiffies + HZ/UDC_RDE_TIMER_DIV;
set_rde = 1;
if (!stop_timer)
add_timer(&udc_timer);
}
}
}
}
/* Interrupt handler for data OUT traffic */
static irqreturn_t udc_data_out_isr(struct udc *dev, int ep_ix)
{
irqreturn_t ret_val = IRQ_NONE;
u32 tmp;
struct udc_ep *ep;
struct udc_request *req;
unsigned int count;
struct udc_data_dma *td = NULL;
unsigned dma_done;
VDBG(dev, "ep%d irq\n", ep_ix);
ep = &dev->ep[ep_ix];
tmp = readl(&ep->regs->sts);
if (use_dma) {
/* BNA event ? */
if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
DBG(dev, "BNA ep%dout occurred - DESPTR = %x\n",
ep->num, readl(&ep->regs->desptr));
/* clear BNA */
writel(tmp | AMD_BIT(UDC_EPSTS_BNA), &ep->regs->sts);
if (!ep->cancel_transfer)
ep->bna_occurred = 1;
else
ep->cancel_transfer = 0;
ret_val = IRQ_HANDLED;
goto finished;
}
}
/* HE event ? */
if (tmp & AMD_BIT(UDC_EPSTS_HE)) {
dev_err(&dev->pdev->dev, "HE ep%dout occurred\n", ep->num);
/* clear HE */
writel(tmp | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
ret_val = IRQ_HANDLED;
goto finished;
}
if (!list_empty(&ep->queue)) {
/* next request */
req = list_entry(ep->queue.next,
struct udc_request, queue);
} else {
req = NULL;
udc_rxfifo_pending = 1;
}
VDBG(dev, "req = %p\n", req);
/* fifo mode */
if (!use_dma) {
/* read fifo */
if (req && udc_rxfifo_read(ep, req)) {
ret_val = IRQ_HANDLED;
/* finish */
complete_req(ep, req, 0);
/* next request */
if (!list_empty(&ep->queue) && !ep->halted) {
req = list_entry(ep->queue.next,
struct udc_request, queue);
} else
req = NULL;
}
/* DMA */
} else if (!ep->cancel_transfer && req != NULL) {
ret_val = IRQ_HANDLED;
/* check for DMA done */
if (!use_dma_ppb) {
dma_done = AMD_GETBITS(req->td_data->status,
UDC_DMA_OUT_STS_BS);
/* packet per buffer mode - rx bytes */
} else {
/*
* if BNA occurred then recover desc. from
* BNA dummy desc.
*/
if (ep->bna_occurred) {
VDBG(dev, "Recover desc. from BNA dummy\n");
memcpy(req->td_data, ep->bna_dummy_req->td_data,
sizeof(struct udc_data_dma));
ep->bna_occurred = 0;
udc_init_bna_dummy(ep->req);
}
td = udc_get_last_dma_desc(req);
dma_done = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_BS);
}
if (dma_done == UDC_DMA_OUT_STS_BS_DMA_DONE) {
/* buffer fill mode - rx bytes */
if (!use_dma_ppb) {
/* received number bytes */
count = AMD_GETBITS(req->td_data->status,
UDC_DMA_OUT_STS_RXBYTES);
VDBG(dev, "rx bytes=%u\n", count);
/* packet per buffer mode - rx bytes */
} else {
VDBG(dev, "req->td_data=%p\n", req->td_data);
VDBG(dev, "last desc = %p\n", td);
/* received number bytes */
if (use_dma_ppb_du) {
/* every desc. counts bytes */
count = udc_get_ppbdu_rxbytes(req);
} else {
/* last desc. counts bytes */
count = AMD_GETBITS(td->status,
UDC_DMA_OUT_STS_RXBYTES);
if (!count && req->req.length
== UDC_DMA_MAXPACKET) {
/*
* on 64k packets the RXBYTES
* field is zero
*/
count = UDC_DMA_MAXPACKET;
}
}
VDBG(dev, "last desc rx bytes=%u\n", count);
}
tmp = req->req.length - req->req.actual;
if (count > tmp) {
if ((tmp % ep->ep.maxpacket) != 0) {
DBG(dev, "%s: rx %db, space=%db\n",
ep->ep.name, count, tmp);
req->req.status = -EOVERFLOW;
}
count = tmp;
}
req->req.actual += count;
req->dma_going = 0;
/* complete request */
complete_req(ep, req, 0);
/* next request */
if (!list_empty(&ep->queue) && !ep->halted) {
req = list_entry(ep->queue.next,
struct udc_request,
queue);
/*
* DMA may be already started by udc_queue()
* called by gadget drivers completion
* routine. This happens when queue
* holds one request only.
*/
if (req->dma_going == 0) {
/* next dma */
if (prep_dma(ep, req, GFP_ATOMIC) != 0)
goto finished;
/* write desc pointer */
writel(req->td_phys,
&ep->regs->desptr);
req->dma_going = 1;
/* enable DMA */
udc_set_rde(dev);
}
} else {
/*
* implant BNA dummy descriptor to allow
* RXFIFO opening by RDE
*/
if (ep->bna_dummy_req) {
/* write desc pointer */
writel(ep->bna_dummy_req->td_phys,
&ep->regs->desptr);
ep->bna_occurred = 0;
}
/*
* schedule timer for setting RDE if queue
* remains empty to allow ep0 packets pass
* through
*/
if (set_rde != 0
&& !timer_pending(&udc_timer)) {
udc_timer.expires =
jiffies
+ HZ*UDC_RDE_TIMER_SECONDS;
set_rde = 1;
if (!stop_timer)
add_timer(&udc_timer);
}
if (ep->num != UDC_EP0OUT_IX)
dev->data_ep_queued = 0;
}
} else {
/*
* RX DMA must be reenabled for each desc in PPBDU mode
* and must be enabled for PPBNDU mode in case of BNA
*/
udc_set_rde(dev);
}
} else if (ep->cancel_transfer) {
ret_val = IRQ_HANDLED;
ep->cancel_transfer = 0;
}
/* check pending CNAKS */
if (cnak_pending) {
/* CNAk processing when rxfifo empty only */
if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
udc_process_cnak_queue(dev);
}
/* clear OUT bits in ep status */
writel(UDC_EPSTS_OUT_CLEAR, &ep->regs->sts);
finished:
return ret_val;
}
/* Interrupt handler for data IN traffic */
static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
{
irqreturn_t ret_val = IRQ_NONE;
u32 tmp;
u32 epsts;
struct udc_ep *ep;
struct udc_request *req;
struct udc_data_dma *td;
unsigned dma_done;
unsigned len;
ep = &dev->ep[ep_ix];
epsts = readl(&ep->regs->sts);
if (use_dma) {
/* BNA ? */
if (epsts & AMD_BIT(UDC_EPSTS_BNA)) {
dev_err(&dev->pdev->dev,
"BNA ep%din occurred - DESPTR = %08lx\n",
ep->num,
(unsigned long) readl(&ep->regs->desptr));
/* clear BNA */
writel(epsts, &ep->regs->sts);
ret_val = IRQ_HANDLED;
goto finished;
}
}
/* HE event ? */
if (epsts & AMD_BIT(UDC_EPSTS_HE)) {
dev_err(&dev->pdev->dev,
"HE ep%dn occurred - DESPTR = %08lx\n",
ep->num, (unsigned long) readl(&ep->regs->desptr));
/* clear HE */
writel(epsts | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
ret_val = IRQ_HANDLED;
goto finished;
}
/* DMA completion */
if (epsts & AMD_BIT(UDC_EPSTS_TDC)) {
VDBG(dev, "TDC set- completion\n");
ret_val = IRQ_HANDLED;
if (!ep->cancel_transfer && !list_empty(&ep->queue)) {
req = list_entry(ep->queue.next,
struct udc_request, queue);
/*
* length bytes transferred
* check dma done of last desc. in PPBDU mode
*/
if (use_dma_ppb_du) {
td = udc_get_last_dma_desc(req);
if (td) {
dma_done =
AMD_GETBITS(td->status,
UDC_DMA_IN_STS_BS);
/* don't care DMA done */
req->req.actual = req->req.length;
}
} else {
/* assume all bytes transferred */
req->req.actual = req->req.length;
}
if (req->req.actual == req->req.length) {
/* complete req */
complete_req(ep, req, 0);
req->dma_going = 0;
/* further request available ? */
if (list_empty(&ep->queue)) {
/* disable interrupt */
tmp = readl(&dev->regs->ep_irqmsk);
tmp |= AMD_BIT(ep->num);
writel(tmp, &dev->regs->ep_irqmsk);
}
}
}
ep->cancel_transfer = 0;
}
/*
* status reg has IN bit set and TDC not set (if TDC was handled,
* IN must not be handled (UDC defect) ?
*/
if ((epsts & AMD_BIT(UDC_EPSTS_IN))
&& !(epsts & AMD_BIT(UDC_EPSTS_TDC))) {
ret_val = IRQ_HANDLED;
if (!list_empty(&ep->queue)) {
/* next request */
req = list_entry(ep->queue.next,
struct udc_request, queue);
/* FIFO mode */
if (!use_dma) {
/* write fifo */
udc_txfifo_write(ep, &req->req);
len = req->req.length - req->req.actual;
if (len > ep->ep.maxpacket)
len = ep->ep.maxpacket;
req->req.actual += len;
if (req->req.actual == req->req.length
|| (len != ep->ep.maxpacket)) {
/* complete req */
complete_req(ep, req, 0);
}
/* DMA */
} else if (req && !req->dma_going) {
VDBG(dev, "IN DMA : req=%p req->td_data=%p\n",
req, req->td_data);
if (req->td_data) {
req->dma_going = 1;
/*
* unset L bit of first desc.
* for chain
*/
if (use_dma_ppb && req->req.length >
ep->ep.maxpacket) {
req->td_data->status &=
AMD_CLEAR_BIT(
UDC_DMA_IN_STS_L);
}
/* write desc pointer */
writel(req->td_phys, &ep->regs->desptr);
/* set HOST READY */
req->td_data->status =
AMD_ADDBITS(
req->td_data->status,
UDC_DMA_IN_STS_BS_HOST_READY,
UDC_DMA_IN_STS_BS);
/* set poll demand bit */
tmp = readl(&ep->regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_P);
writel(tmp, &ep->regs->ctl);
}
}
} else if (!use_dma && ep->in) {
/* disable interrupt */
tmp = readl(
&dev->regs->ep_irqmsk);
tmp |= AMD_BIT(ep->num);
writel(tmp,
&dev->regs->ep_irqmsk);
}
}
/* clear status bits */
writel(epsts, &ep->regs->sts);
finished:
return ret_val;
}
/* Interrupt handler for Control OUT traffic */
static irqreturn_t udc_control_out_isr(struct udc *dev)
__releases(dev->lock)
__acquires(dev->lock)
{
irqreturn_t ret_val = IRQ_NONE;
u32 tmp;
int setup_supported;
u32 count;
int set = 0;
struct udc_ep *ep;
struct udc_ep *ep_tmp;
ep = &dev->ep[UDC_EP0OUT_IX];
/* clear irq */
writel(AMD_BIT(UDC_EPINT_OUT_EP0), &dev->regs->ep_irqsts);
tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
/* check BNA and clear if set */
if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
VDBG(dev, "ep0: BNA set\n");
writel(AMD_BIT(UDC_EPSTS_BNA),
&dev->ep[UDC_EP0OUT_IX].regs->sts);
ep->bna_occurred = 1;
ret_val = IRQ_HANDLED;
goto finished;
}
/* type of data: SETUP or DATA 0 bytes */
tmp = AMD_GETBITS(tmp, UDC_EPSTS_OUT);
VDBG(dev, "data_typ = %x\n", tmp);
/* setup data */
if (tmp == UDC_EPSTS_OUT_SETUP) {
ret_val = IRQ_HANDLED;
ep->dev->stall_ep0in = 0;
dev->waiting_zlp_ack_ep0in = 0;
/* set NAK for EP0_IN */
tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_SNAK);
writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
dev->ep[UDC_EP0IN_IX].naking = 1;
/* get setup data */
if (use_dma) {
/* clear OUT bits in ep status */
writel(UDC_EPSTS_OUT_CLEAR,
&dev->ep[UDC_EP0OUT_IX].regs->sts);
setup_data.data[0] =
dev->ep[UDC_EP0OUT_IX].td_stp->data12;
setup_data.data[1] =
dev->ep[UDC_EP0OUT_IX].td_stp->data34;
/* set HOST READY */
dev->ep[UDC_EP0OUT_IX].td_stp->status =
UDC_DMA_STP_STS_BS_HOST_READY;
} else {
/* read fifo */
udc_rxfifo_read_dwords(dev, setup_data.data, 2);
}
/* determine direction of control data */
if ((setup_data.request.bRequestType & USB_DIR_IN) != 0) {
dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
/* enable RDE */
udc_ep0_set_rde(dev);
set = 0;
} else {
dev->gadget.ep0 = &dev->ep[UDC_EP0OUT_IX].ep;
/*
* implant BNA dummy descriptor to allow RXFIFO opening
* by RDE
*/
if (ep->bna_dummy_req) {
/* write desc pointer */
writel(ep->bna_dummy_req->td_phys,
&dev->ep[UDC_EP0OUT_IX].regs->desptr);
ep->bna_occurred = 0;
}
set = 1;
dev->ep[UDC_EP0OUT_IX].naking = 1;
/*
* setup timer for enabling RDE (to not enable
* RXFIFO DMA for data to early)
*/
set_rde = 1;
if (!timer_pending(&udc_timer)) {
udc_timer.expires = jiffies +
HZ/UDC_RDE_TIMER_DIV;
if (!stop_timer)
add_timer(&udc_timer);
}
}
/*
* mass storage reset must be processed here because
* next packet may be a CLEAR_FEATURE HALT which would not
* clear the stall bit when no STALL handshake was received
* before (autostall can cause this)
*/
if (setup_data.data[0] == UDC_MSCRES_DWORD0
&& setup_data.data[1] == UDC_MSCRES_DWORD1) {
DBG(dev, "MSC Reset\n");
/*
* clear stall bits
* only one IN and OUT endpoints are handled
*/
ep_tmp = &udc->ep[UDC_EPIN_IX];
udc_set_halt(&ep_tmp->ep, 0);
ep_tmp = &udc->ep[UDC_EPOUT_IX];
udc_set_halt(&ep_tmp->ep, 0);
}
/* call gadget with setup data received */
spin_unlock(&dev->lock);
setup_supported = dev->driver->setup(&dev->gadget,
&setup_data.request);
spin_lock(&dev->lock);
tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
/* ep0 in returns data (not zlp) on IN phase */
if (setup_supported >= 0 && setup_supported <
UDC_EP0IN_MAXPACKET) {
/* clear NAK by writing CNAK in EP0_IN */
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
dev->ep[UDC_EP0IN_IX].naking = 0;
UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
/* if unsupported request then stall */
} else if (setup_supported < 0) {
tmp |= AMD_BIT(UDC_EPCTL_S);
writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
} else
dev->waiting_zlp_ack_ep0in = 1;
/* clear NAK by writing CNAK in EP0_OUT */
if (!set) {
tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_CNAK);
writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
dev->ep[UDC_EP0OUT_IX].naking = 0;
UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
}
if (!use_dma) {
/* clear OUT bits in ep status */
writel(UDC_EPSTS_OUT_CLEAR,
&dev->ep[UDC_EP0OUT_IX].regs->sts);
}
/* data packet 0 bytes */
} else if (tmp == UDC_EPSTS_OUT_DATA) {
/* clear OUT bits in ep status */
writel(UDC_EPSTS_OUT_CLEAR, &dev->ep[UDC_EP0OUT_IX].regs->sts);
/* get setup data: only 0 packet */
if (use_dma) {
/* no req if 0 packet, just reactivate */
if (list_empty(&dev->ep[UDC_EP0OUT_IX].queue)) {
VDBG(dev, "ZLP\n");
/* set HOST READY */
dev->ep[UDC_EP0OUT_IX].td->status =
AMD_ADDBITS(
dev->ep[UDC_EP0OUT_IX].td->status,
UDC_DMA_OUT_STS_BS_HOST_READY,
UDC_DMA_OUT_STS_BS);
/* enable RDE */
udc_ep0_set_rde(dev);
ret_val = IRQ_HANDLED;
} else {
/* control write */
ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
/* re-program desc. pointer for possible ZLPs */
writel(dev->ep[UDC_EP0OUT_IX].td_phys,
&dev->ep[UDC_EP0OUT_IX].regs->desptr);
/* enable RDE */
udc_ep0_set_rde(dev);
}
} else {
/* received number bytes */
count = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
count = AMD_GETBITS(count, UDC_EPSTS_RX_PKT_SIZE);
/* out data for fifo mode not working */
count = 0;
/* 0 packet or real data ? */
if (count != 0) {
ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
} else {
/* dummy read confirm */
readl(&dev->ep[UDC_EP0OUT_IX].regs->confirm);
ret_val = IRQ_HANDLED;
}
}
}
/* check pending CNAKS */
if (cnak_pending) {
/* CNAk processing when rxfifo empty only */
if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
udc_process_cnak_queue(dev);
}
finished:
return ret_val;
}
/* Interrupt handler for Control IN traffic */
static irqreturn_t udc_control_in_isr(struct udc *dev)
{
irqreturn_t ret_val = IRQ_NONE;
u32 tmp;
struct udc_ep *ep;
struct udc_request *req;
unsigned len;
ep = &dev->ep[UDC_EP0IN_IX];
/* clear irq */
writel(AMD_BIT(UDC_EPINT_IN_EP0), &dev->regs->ep_irqsts);
tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->sts);
/* DMA completion */
if (tmp & AMD_BIT(UDC_EPSTS_TDC)) {
VDBG(dev, "isr: TDC clear\n");
ret_val = IRQ_HANDLED;
/* clear TDC bit */
writel(AMD_BIT(UDC_EPSTS_TDC),
&dev->ep[UDC_EP0IN_IX].regs->sts);
/* status reg has IN bit set ? */
} else if (tmp & AMD_BIT(UDC_EPSTS_IN)) {
ret_val = IRQ_HANDLED;
if (ep->dma) {
/* clear IN bit */
writel(AMD_BIT(UDC_EPSTS_IN),
&dev->ep[UDC_EP0IN_IX].regs->sts);
}
if (dev->stall_ep0in) {
DBG(dev, "stall ep0in\n");
/* halt ep0in */
tmp = readl(&ep->regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_S);
writel(tmp, &ep->regs->ctl);
} else {
if (!list_empty(&ep->queue)) {
/* next request */
req = list_entry(ep->queue.next,
struct udc_request, queue);
if (ep->dma) {
/* write desc pointer */
writel(req->td_phys, &ep->regs->desptr);
/* set HOST READY */
req->td_data->status =
AMD_ADDBITS(
req->td_data->status,
UDC_DMA_STP_STS_BS_HOST_READY,
UDC_DMA_STP_STS_BS);
/* set poll demand bit */
tmp =
readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
tmp |= AMD_BIT(UDC_EPCTL_P);
writel(tmp,
&dev->ep[UDC_EP0IN_IX].regs->ctl);
/* all bytes will be transferred */
req->req.actual = req->req.length;
/* complete req */
complete_req(ep, req, 0);
} else {
/* write fifo */
udc_txfifo_write(ep, &req->req);
/* lengh bytes transferred */
len = req->req.length - req->req.actual;
if (len > ep->ep.maxpacket)
len = ep->ep.maxpacket;
req->req.actual += len;
if (req->req.actual == req->req.length
|| (len != ep->ep.maxpacket)) {
/* complete req */
complete_req(ep, req, 0);
}
}
}
}
ep->halted = 0;
dev->stall_ep0in = 0;
if (!ep->dma) {
/* clear IN bit */
writel(AMD_BIT(UDC_EPSTS_IN),
&dev->ep[UDC_EP0IN_IX].regs->sts);
}
}
return ret_val;
}
/* Interrupt handler for global device events */
static irqreturn_t udc_dev_isr(struct udc *dev, u32 dev_irq)
__releases(dev->lock)
__acquires(dev->lock)
{
irqreturn_t ret_val = IRQ_NONE;
u32 tmp;
u32 cfg;
struct udc_ep *ep;
u16 i;
u8 udc_csr_epix;
/* SET_CONFIG irq ? */
if (dev_irq & AMD_BIT(UDC_DEVINT_SC)) {
ret_val = IRQ_HANDLED;
/* read config value */
tmp = readl(&dev->regs->sts);
cfg = AMD_GETBITS(tmp, UDC_DEVSTS_CFG);
DBG(dev, "SET_CONFIG interrupt: config=%d\n", cfg);
dev->cur_config = cfg;
dev->set_cfg_not_acked = 1;
/* make usb request for gadget driver */
memset(&setup_data, 0 , sizeof(union udc_setup_data));
setup_data.request.bRequest = USB_REQ_SET_CONFIGURATION;
setup_data.request.wValue = cpu_to_le16(dev->cur_config);
/* programm the NE registers */
for (i = 0; i < UDC_EP_NUM; i++) {
ep = &dev->ep[i];
if (ep->in) {
/* ep ix in UDC CSR register space */
udc_csr_epix = ep->num;
/* OUT ep */
} else {
/* ep ix in UDC CSR register space */
udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
}
tmp = readl(&dev->csr->ne[udc_csr_epix]);
/* ep cfg */
tmp = AMD_ADDBITS(tmp, ep->dev->cur_config,
UDC_CSR_NE_CFG);
/* write reg */
writel(tmp, &dev->csr->ne[udc_csr_epix]);
/* clear stall bits */
ep->halted = 0;
tmp = readl(&ep->regs->ctl);
tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
writel(tmp, &ep->regs->ctl);
}
/* call gadget zero with setup data received */
spin_unlock(&dev->lock);
tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
spin_lock(&dev->lock);
} /* SET_INTERFACE ? */
if (dev_irq & AMD_BIT(UDC_DEVINT_SI)) {
ret_val = IRQ_HANDLED;
dev->set_cfg_not_acked = 1;
/* read interface and alt setting values */
tmp = readl(&dev->regs->sts);
dev->cur_alt = AMD_GETBITS(tmp, UDC_DEVSTS_ALT);
dev->cur_intf = AMD_GETBITS(tmp, UDC_DEVSTS_INTF);
/* make usb request for gadget driver */
memset(&setup_data, 0 , sizeof(union udc_setup_data));
setup_data.request.bRequest = USB_REQ_SET_INTERFACE;
setup_data.request.bRequestType = USB_RECIP_INTERFACE;
setup_data.request.wValue = cpu_to_le16(dev->cur_alt);
setup_data.request.wIndex = cpu_to_le16(dev->cur_intf);
DBG(dev, "SET_INTERFACE interrupt: alt=%d intf=%d\n",
dev->cur_alt, dev->cur_intf);
/* programm the NE registers */
for (i = 0; i < UDC_EP_NUM; i++) {
ep = &dev->ep[i];
if (ep->in) {
/* ep ix in UDC CSR register space */
udc_csr_epix = ep->num;
/* OUT ep */
} else {
/* ep ix in UDC CSR register space */
udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
}
/* UDC CSR reg */
/* set ep values */
tmp = readl(&dev->csr->ne[udc_csr_epix]);
/* ep interface */
tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf,
UDC_CSR_NE_INTF);
/* tmp = AMD_ADDBITS(tmp, 2, UDC_CSR_NE_INTF); */
/* ep alt */
tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt,
UDC_CSR_NE_ALT);
/* write reg */
writel(tmp, &dev->csr->ne[udc_csr_epix]);
/* clear stall bits */
ep->halted = 0;
tmp = readl(&ep->regs->ctl);
tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
writel(tmp, &ep->regs->ctl);
}
/* call gadget zero with setup data received */
spin_unlock(&dev->lock);
tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
spin_lock(&dev->lock);
} /* USB reset */
if (dev_irq & AMD_BIT(UDC_DEVINT_UR)) {
DBG(dev, "USB Reset interrupt\n");
ret_val = IRQ_HANDLED;
/* allow soft reset when suspend occurs */
soft_reset_occured = 0;
dev->waiting_zlp_ack_ep0in = 0;
dev->set_cfg_not_acked = 0;
/* mask not needed interrupts */
udc_mask_unused_interrupts(dev);
/* call gadget to resume and reset configs etc. */
spin_unlock(&dev->lock);
if (dev->sys_suspended && dev->driver->resume) {
dev->driver->resume(&dev->gadget);
dev->sys_suspended = 0;
}
dev->driver->disconnect(&dev->gadget);
spin_lock(&dev->lock);
/* disable ep0 to empty req queue */
empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
/* soft reset when rxfifo not empty */
tmp = readl(&dev->regs->sts);
if (!(tmp & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
&& !soft_reset_after_usbreset_occured) {
udc_soft_reset(dev);
soft_reset_after_usbreset_occured++;
}
/*
* DMA reset to kill potential old DMA hw hang,
* POLL bit is already reset by ep_init() through
* disconnect()
*/
DBG(dev, "DMA machine reset\n");
tmp = readl(&dev->regs->cfg);
writel(tmp | AMD_BIT(UDC_DEVCFG_DMARST), &dev->regs->cfg);
writel(tmp, &dev->regs->cfg);
/* put into initial config */
udc_basic_init(dev);
/* enable device setup interrupts */
udc_enable_dev_setup_interrupts(dev);
/* enable suspend interrupt */
tmp = readl(&dev->regs->irqmsk);
tmp &= AMD_UNMASK_BIT(UDC_DEVINT_US);
writel(tmp, &dev->regs->irqmsk);
} /* USB suspend */
if (dev_irq & AMD_BIT(UDC_DEVINT_US)) {
DBG(dev, "USB Suspend interrupt\n");
ret_val = IRQ_HANDLED;
if (dev->driver->suspend) {
spin_unlock(&dev->lock);
dev->sys_suspended = 1;
dev->driver->suspend(&dev->gadget);
spin_lock(&dev->lock);
}
} /* new speed ? */
if (dev_irq & AMD_BIT(UDC_DEVINT_ENUM)) {
DBG(dev, "ENUM interrupt\n");
ret_val = IRQ_HANDLED;
soft_reset_after_usbreset_occured = 0;
/* disable ep0 to empty req queue */
empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
/* link up all endpoints */
udc_setup_endpoints(dev);
dev_info(&dev->pdev->dev, "Connect: %s\n",
usb_speed_string(dev->gadget.speed));
/* init ep 0 */
activate_control_endpoints(dev);
/* enable ep0 interrupts */
udc_enable_ep0_interrupts(dev);
}
/* session valid change interrupt */
if (dev_irq & AMD_BIT(UDC_DEVINT_SVC)) {
DBG(dev, "USB SVC interrupt\n");
ret_val = IRQ_HANDLED;
/* check that session is not valid to detect disconnect */
tmp = readl(&dev->regs->sts);
if (!(tmp & AMD_BIT(UDC_DEVSTS_SESSVLD))) {
/* disable suspend interrupt */
tmp = readl(&dev->regs->irqmsk);
tmp |= AMD_BIT(UDC_DEVINT_US);
writel(tmp, &dev->regs->irqmsk);
DBG(dev, "USB Disconnect (session valid low)\n");
/* cleanup on disconnect */
usb_disconnect(udc);
}
}
return ret_val;
}
/* Interrupt Service Routine, see Linux Kernel Doc for parameters */
static irqreturn_t udc_irq(int irq, void *pdev)
{
struct udc *dev = pdev;
u32 reg;
u16 i;
u32 ep_irq;
irqreturn_t ret_val = IRQ_NONE;
spin_lock(&dev->lock);
/* check for ep irq */
reg = readl(&dev->regs->ep_irqsts);
if (reg) {
if (reg & AMD_BIT(UDC_EPINT_OUT_EP0))
ret_val |= udc_control_out_isr(dev);
if (reg & AMD_BIT(UDC_EPINT_IN_EP0))
ret_val |= udc_control_in_isr(dev);
/*
* data endpoint
* iterate ep's
*/
for (i = 1; i < UDC_EP_NUM; i++) {
ep_irq = 1 << i;
if (!(reg & ep_irq) || i == UDC_EPINT_OUT_EP0)
continue;
/* clear irq status */
writel(ep_irq, &dev->regs->ep_irqsts);
/* irq for out ep ? */
if (i > UDC_EPIN_NUM)
ret_val |= udc_data_out_isr(dev, i);
else
ret_val |= udc_data_in_isr(dev, i);
}
}
/* check for dev irq */
reg = readl(&dev->regs->irqsts);
if (reg) {
/* clear irq */
writel(reg, &dev->regs->irqsts);
ret_val |= udc_dev_isr(dev, reg);
}
spin_unlock(&dev->lock);
return ret_val;
}
/* Tears down device */
static void gadget_release(struct device *pdev)
{
struct amd5536udc *dev = dev_get_drvdata(pdev);
kfree(dev);
}
/* Cleanup on device remove */
static void udc_remove(struct udc *dev)
{
/* remove timer */
stop_timer++;
if (timer_pending(&udc_timer))
wait_for_completion(&on_exit);
if (udc_timer.data)
del_timer_sync(&udc_timer);
/* remove pollstall timer */
stop_pollstall_timer++;
if (timer_pending(&udc_pollstall_timer))
wait_for_completion(&on_pollstall_exit);
if (udc_pollstall_timer.data)
del_timer_sync(&udc_pollstall_timer);
udc = NULL;
}
/* Reset all pci context */
static void udc_pci_remove(struct pci_dev *pdev)
{
struct udc *dev;
dev = pci_get_drvdata(pdev);
usb_del_gadget_udc(&udc->gadget);
/* gadget driver must not be registered */
BUG_ON(dev->driver != NULL);
/* dma pool cleanup */
if (dev->data_requests)
pci_pool_destroy(dev->data_requests);
if (dev->stp_requests) {
/* cleanup DMA desc's for ep0in */
pci_pool_free(dev->stp_requests,
dev->ep[UDC_EP0OUT_IX].td_stp,
dev->ep[UDC_EP0OUT_IX].td_stp_dma);
pci_pool_free(dev->stp_requests,
dev->ep[UDC_EP0OUT_IX].td,
dev->ep[UDC_EP0OUT_IX].td_phys);
pci_pool_destroy(dev->stp_requests);
}
/* reset controller */
writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
if (dev->irq_registered)
free_irq(pdev->irq, dev);
if (dev->regs)
iounmap(dev->regs);
if (dev->mem_region)
release_mem_region(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
if (dev->active)
pci_disable_device(pdev);
device_unregister(&dev->gadget.dev);
pci_set_drvdata(pdev, NULL);
udc_remove(dev);
}
/* create dma pools on init */
static int init_dma_pools(struct udc *dev)
{
struct udc_stp_dma *td_stp;
struct udc_data_dma *td_data;
int retval;
/* consistent DMA mode setting ? */
if (use_dma_ppb) {
use_dma_bufferfill_mode = 0;
} else {
use_dma_ppb_du = 0;
use_dma_bufferfill_mode = 1;
}
/* DMA setup */
dev->data_requests = dma_pool_create("data_requests", NULL,
sizeof(struct udc_data_dma), 0, 0);
if (!dev->data_requests) {
DBG(dev, "can't get request data pool\n");
retval = -ENOMEM;
goto finished;
}
/* EP0 in dma regs = dev control regs */
dev->ep[UDC_EP0IN_IX].dma = &dev->regs->ctl;
/* dma desc for setup data */
dev->stp_requests = dma_pool_create("setup requests", NULL,
sizeof(struct udc_stp_dma), 0, 0);
if (!dev->stp_requests) {
DBG(dev, "can't get stp request pool\n");
retval = -ENOMEM;
goto finished;
}
/* setup */
td_stp = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
&dev->ep[UDC_EP0OUT_IX].td_stp_dma);
if (td_stp == NULL) {
retval = -ENOMEM;
goto finished;
}
dev->ep[UDC_EP0OUT_IX].td_stp = td_stp;
/* data: 0 packets !? */
td_data = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
&dev->ep[UDC_EP0OUT_IX].td_phys);
if (td_data == NULL) {
retval = -ENOMEM;
goto finished;
}
dev->ep[UDC_EP0OUT_IX].td = td_data;
return 0;
finished:
return retval;
}
/* Called by pci bus driver to init pci context */
static int udc_pci_probe(
struct pci_dev *pdev,
const struct pci_device_id *id
)
{
struct udc *dev;
unsigned long resource;
unsigned long len;
int retval = 0;
/* one udc only */
if (udc) {
dev_dbg(&pdev->dev, "already probed\n");
return -EBUSY;
}
/* init */
dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
if (!dev) {
retval = -ENOMEM;
goto finished;
}
/* pci setup */
if (pci_enable_device(pdev) < 0) {
kfree(dev);
dev = NULL;
retval = -ENODEV;
goto finished;
}
dev->active = 1;
/* PCI resource allocation */
resource = pci_resource_start(pdev, 0);
len = pci_resource_len(pdev, 0);
if (!request_mem_region(resource, len, name)) {
dev_dbg(&pdev->dev, "pci device used already\n");
kfree(dev);
dev = NULL;
retval = -EBUSY;
goto finished;
}
dev->mem_region = 1;
dev->virt_addr = ioremap_nocache(resource, len);
if (dev->virt_addr == NULL) {
dev_dbg(&pdev->dev, "start address cannot be mapped\n");
kfree(dev);
dev = NULL;
retval = -EFAULT;
goto finished;
}
if (!pdev->irq) {
dev_err(&dev->pdev->dev, "irq not set\n");
kfree(dev);
dev = NULL;
retval = -ENODEV;
goto finished;
}
spin_lock_init(&dev->lock);
/* udc csr registers base */
dev->csr = dev->virt_addr + UDC_CSR_ADDR;
/* dev registers base */
dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
/* ep registers base */
dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
/* fifo's base */
dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
dev_dbg(&dev->pdev->dev, "request_irq(%d) fail\n", pdev->irq);
kfree(dev);
dev = NULL;
retval = -EBUSY;
goto finished;
}
dev->irq_registered = 1;
pci_set_drvdata(pdev, dev);
/* chip revision for Hs AMD5536 */
dev->chiprev = pdev->revision;
pci_set_master(pdev);
pci_try_set_mwi(pdev);
/* init dma pools */
if (use_dma) {
retval = init_dma_pools(dev);
if (retval != 0)
goto finished;
}
dev->phys_addr = resource;
dev->irq = pdev->irq;
dev->pdev = pdev;
dev->gadget.dev.parent = &pdev->dev;
dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
/* general probing */
if (udc_probe(dev) == 0)
return 0;
finished:
if (dev)
udc_pci_remove(pdev);
return retval;
}
/* general probe */
static int udc_probe(struct udc *dev)
{
char tmp[128];
u32 reg;
int retval;
/* mark timer as not initialized */
udc_timer.data = 0;
udc_pollstall_timer.data = 0;
/* device struct setup */
dev->gadget.ops = &udc_ops;
dev_set_name(&dev->gadget.dev, "gadget");
dev->gadget.dev.release = gadget_release;
dev->gadget.name = name;
dev->gadget.max_speed = USB_SPEED_HIGH;
/* init registers, interrupts, ... */
startup_registers(dev);
dev_info(&dev->pdev->dev, "%s\n", mod_desc);
snprintf(tmp, sizeof tmp, "%d", dev->irq);
dev_info(&dev->pdev->dev,
"irq %s, pci mem %08lx, chip rev %02x(Geode5536 %s)\n",
tmp, dev->phys_addr, dev->chiprev,
(dev->chiprev == UDC_HSA0_REV) ? "A0" : "B1");
strcpy(tmp, UDC_DRIVER_VERSION_STRING);
if (dev->chiprev == UDC_HSA0_REV) {
dev_err(&dev->pdev->dev, "chip revision is A0; too old\n");
retval = -ENODEV;
goto finished;
}
dev_info(&dev->pdev->dev,
"driver version: %s(for Geode5536 B1)\n", tmp);
udc = dev;
retval = usb_add_gadget_udc(&udc->pdev->dev, &dev->gadget);
if (retval)
goto finished;
retval = device_register(&dev->gadget.dev);
if (retval) {
usb_del_gadget_udc(&dev->gadget);
put_device(&dev->gadget.dev);
goto finished;
}
/* timer init */
init_timer(&udc_timer);
udc_timer.function = udc_timer_function;
udc_timer.data = 1;
/* timer pollstall init */
init_timer(&udc_pollstall_timer);
udc_pollstall_timer.function = udc_pollstall_timer_function;
udc_pollstall_timer.data = 1;
/* set SD */
reg = readl(&dev->regs->ctl);
reg |= AMD_BIT(UDC_DEVCTL_SD);
writel(reg, &dev->regs->ctl);
/* print dev register info */
print_regs(dev);
return 0;
finished:
return retval;
}
/* Initiates a remote wakeup */
static int udc_remote_wakeup(struct udc *dev)
{
unsigned long flags;
u32 tmp;
DBG(dev, "UDC initiates remote wakeup\n");
spin_lock_irqsave(&dev->lock, flags);
tmp = readl(&dev->regs->ctl);
tmp |= AMD_BIT(UDC_DEVCTL_RES);
writel(tmp, &dev->regs->ctl);
tmp &= AMD_CLEAR_BIT(UDC_DEVCTL_RES);
writel(tmp, &dev->regs->ctl);
spin_unlock_irqrestore(&dev->lock, flags);
return 0;
}
/* PCI device parameters */
static DEFINE_PCI_DEVICE_TABLE(pci_id) = {
{
PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
.class = (PCI_CLASS_SERIAL_USB << 8) | 0xfe,
.class_mask = 0xffffffff,
},
{},
};
MODULE_DEVICE_TABLE(pci, pci_id);
/* PCI functions */
static struct pci_driver udc_pci_driver = {
.name = (char *) name,
.id_table = pci_id,
.probe = udc_pci_probe,
.remove = udc_pci_remove,
};
module_pci_driver(udc_pci_driver);
MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
MODULE_AUTHOR("Thomas Dahlmann");
MODULE_LICENSE("GPL");
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