/*
* BRIEF MODULE DESCRIPTION
* Au1000 USB Device-Side (device layer)
*
* Copyright 2001-2002 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* stevel@mvista.com or source@mvista.com
*
* 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.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/smp_lock.h>
#define DEBUG
#include <linux/usb.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/au1000.h>
#include <asm/au1000_dma.h>
#include <asm/au1000_usbdev.h>
#ifdef DEBUG
#undef VDEBUG
#ifdef VDEBUG
#define vdbg(fmt, arg...) printk(KERN_DEBUG __FILE__ ": " fmt "\n" , ## arg)
#else
#define vdbg(fmt, arg...) do {} while (0)
#endif
#else
#define vdbg(fmt, arg...) do {} while (0)
#endif
#define ALLOC_FLAGS (in_interrupt () ? GFP_ATOMIC : GFP_KERNEL)
#define EP_FIFO_DEPTH 8
typedef enum {
SETUP_STAGE = 0,
DATA_STAGE,
STATUS_STAGE
} ep0_stage_t;
typedef struct {
int read_fifo;
int write_fifo;
int ctrl_stat;
int read_fifo_status;
int write_fifo_status;
} endpoint_reg_t;
typedef struct {
usbdev_pkt_t *head;
usbdev_pkt_t *tail;
int count;
} pkt_list_t;
typedef struct {
int active;
struct usb_endpoint_descriptor *desc;
endpoint_reg_t *reg;
/* Only one of these are used, unless this is the control ep */
pkt_list_t inlist;
pkt_list_t outlist;
unsigned int indma, outdma; /* DMA channel numbers for IN, OUT */
/* following are extracted from endpoint descriptor for easy access */
int max_pkt_size;
int type;
int direction;
/* WE assign endpoint addresses! */
int address;
spinlock_t lock;
} endpoint_t;
static struct usb_dev {
endpoint_t ep[6];
ep0_stage_t ep0_stage;
struct usb_device_descriptor * dev_desc;
struct usb_interface_descriptor* if_desc;
struct usb_config_descriptor * conf_desc;
u8 * full_conf_desc;
struct usb_string_descriptor * str_desc[6];
/* callback to function layer */
void (*func_cb)(usbdev_cb_type_t type, unsigned long arg,
void *cb_data);
void* cb_data;
usbdev_state_t state; // device state
int suspended; // suspended flag
int address; // device address
int interface;
int num_ep;
u8 alternate_setting;
u8 configuration; // configuration value
int remote_wakeup_en;
} usbdev;
static endpoint_reg_t ep_reg[] = {
// FIFO's 0 and 1 are EP0 default control
{USBD_EP0RD, USBD_EP0WR, USBD_EP0CS, USBD_EP0RDSTAT, USBD_EP0WRSTAT },
{0},
// FIFO 2 is EP2, IN
{ -1, USBD_EP2WR, USBD_EP2CS, -1, USBD_EP2WRSTAT },
// FIFO 3 is EP3, IN
{ -1, USBD_EP3WR, USBD_EP3CS, -1, USBD_EP3WRSTAT },
// FIFO 4 is EP4, OUT
{USBD_EP4RD, -1, USBD_EP4CS, USBD_EP4RDSTAT, -1 },
// FIFO 5 is EP5, OUT
{USBD_EP5RD, -1, USBD_EP5CS, USBD_EP5RDSTAT, -1 }
};
static struct {
unsigned int id;
const char *str;
} ep_dma_id[] = {
{ DMA_ID_USBDEV_EP0_TX, "USBDev EP0 IN" },
{ DMA_ID_USBDEV_EP0_RX, "USBDev EP0 OUT" },
{ DMA_ID_USBDEV_EP2_TX, "USBDev EP2 IN" },
{ DMA_ID_USBDEV_EP3_TX, "USBDev EP3 IN" },
{ DMA_ID_USBDEV_EP4_RX, "USBDev EP4 OUT" },
{ DMA_ID_USBDEV_EP5_RX, "USBDev EP5 OUT" }
};
#define DIR_OUT 0
#define DIR_IN (1<<3)
#define CONTROL_EP USB_ENDPOINT_XFER_CONTROL
#define BULK_EP USB_ENDPOINT_XFER_BULK
static inline endpoint_t *
epaddr_to_ep(struct usb_dev* dev, int ep_addr)
{
if (ep_addr >= 0 && ep_addr < 2)
return &dev->ep[0];
if (ep_addr < 6)
return &dev->ep[ep_addr];
return NULL;
}
static const char* std_req_name[] = {
"GET_STATUS",
"CLEAR_FEATURE",
"RESERVED",
"SET_FEATURE",
"RESERVED",
"SET_ADDRESS",
"GET_DESCRIPTOR",
"SET_DESCRIPTOR",
"GET_CONFIGURATION",
"SET_CONFIGURATION",
"GET_INTERFACE",
"SET_INTERFACE",
"SYNCH_FRAME"
};
static inline const char*
get_std_req_name(int req)
{
return (req >= 0 && req <= 12) ? std_req_name[req] : "UNKNOWN";
}
#if 0
static void
dump_setup(struct usb_ctrlrequest* s)
{
dbg("%s: requesttype=%d", __FUNCTION__, s->requesttype);
dbg("%s: request=%d %s", __FUNCTION__, s->request,
get_std_req_name(s->request));
dbg("%s: value=0x%04x", __FUNCTION__, s->wValue);
dbg("%s: index=%d", __FUNCTION__, s->index);
dbg("%s: length=%d", __FUNCTION__, s->length);
}
#endif
static inline usbdev_pkt_t *
alloc_packet(endpoint_t * ep, int data_size, void* data)
{
usbdev_pkt_t* pkt = kmalloc(sizeof(usbdev_pkt_t) + data_size,
ALLOC_FLAGS);
if (!pkt)
return NULL;
pkt->ep_addr = ep->address;
pkt->size = data_size;
pkt->status = 0;
pkt->next = NULL;
if (data)
memcpy(pkt->payload, data, data_size);
return pkt;
}
/*
* Link a packet to the tail of the enpoint's packet list.
* EP spinlock must be held when calling.
*/
static void
link_tail(endpoint_t * ep, pkt_list_t * list, usbdev_pkt_t * pkt)
{
if (!list->tail) {
list->head = list->tail = pkt;
list->count = 1;
} else {
list->tail->next = pkt;
list->tail = pkt;
list->count++;
}
}
/*
* Unlink and return a packet from the head of the given packet
* list. It is the responsibility of the caller to free the packet.
* EP spinlock must be held when calling.
*/
static usbdev_pkt_t *
unlink_head(pkt_list_t * list)
{
usbdev_pkt_t *pkt;
pkt = list->head;
if (!pkt || !list->count) {
return NULL;
}
list->head = pkt->next;
if (!list->head) {
list->head = list->tail = NULL;
list->count = 0;
} else
list->count--;
return pkt;
}
/*
* Create and attach a new packet to the tail of the enpoint's
* packet list. EP spinlock must be held when calling.
*/
static usbdev_pkt_t *
add_packet(endpoint_t * ep, pkt_list_t * list, int size)
{
usbdev_pkt_t *pkt = alloc_packet(ep, size, NULL);
if (!pkt)
return NULL;
link_tail(ep, list, pkt);
return pkt;
}
/*
* Unlink and free a packet from the head of the enpoint's
* packet list. EP spinlock must be held when calling.
*/
static inline void
free_packet(pkt_list_t * list)
{
kfree(unlink_head(list));
}
/* EP spinlock must be held when calling. */
static inline void
flush_pkt_list(pkt_list_t * list)
{
while (list->count)
free_packet(list);
}
/* EP spinlock must be held when calling */
static inline void
flush_write_fifo(endpoint_t * ep)
{
if (ep->reg->write_fifo_status >= 0) {
au_writel(USBDEV_FSTAT_FLUSH | USBDEV_FSTAT_UF |
USBDEV_FSTAT_OF,
ep->reg->write_fifo_status);
//udelay(100);
//au_writel(USBDEV_FSTAT_UF | USBDEV_FSTAT_OF,
// ep->reg->write_fifo_status);
}
}
/* EP spinlock must be held when calling */
static inline void
flush_read_fifo(endpoint_t * ep)
{
if (ep->reg->read_fifo_status >= 0) {
au_writel(USBDEV_FSTAT_FLUSH | USBDEV_FSTAT_UF |
USBDEV_FSTAT_OF,
ep->reg->read_fifo_status);
//udelay(100);
//au_writel(USBDEV_FSTAT_UF | USBDEV_FSTAT_OF,
// ep->reg->read_fifo_status);
}
}
/* EP spinlock must be held when calling. */
static void
endpoint_flush(endpoint_t * ep)
{
// First, flush all packets
flush_pkt_list(&ep->inlist);
flush_pkt_list(&ep->outlist);
// Now flush the endpoint's h/w FIFO(s)
flush_write_fifo(ep);
flush_read_fifo(ep);
}
/* EP spinlock must be held when calling. */
static void
endpoint_stall(endpoint_t * ep)
{
u32 cs;
warn(__FUNCTION__);
cs = au_readl(ep->reg->ctrl_stat) | USBDEV_CS_STALL;
au_writel(cs, ep->reg->ctrl_stat);
}
/* EP spinlock must be held when calling. */
static void
endpoint_unstall(endpoint_t * ep)
{
u32 cs;
warn(__FUNCTION__);
cs = au_readl(ep->reg->ctrl_stat) & ~USBDEV_CS_STALL;
au_writel(cs, ep->reg->ctrl_stat);
}
static void
endpoint_reset_datatoggle(endpoint_t * ep)
{
// FIXME: is this possible?
}
/* EP spinlock must be held when calling. */
static int
endpoint_fifo_read(endpoint_t * ep)
{
int read_count = 0;
u8 *bufptr;
usbdev_pkt_t *pkt = ep->outlist.tail;
if (!pkt)
return -EINVAL;
bufptr = &pkt->payload[pkt->size];
while (au_readl(ep->reg->read_fifo_status) & USBDEV_FSTAT_FCNT_MASK) {
*bufptr++ = au_readl(ep->reg->read_fifo) & 0xff;
read_count++;
pkt->size++;
}
return read_count;
}
#if 0
/* EP spinlock must be held when calling. */
static int
endpoint_fifo_write(endpoint_t * ep, int index)
{
int write_count = 0;
u8 *bufptr;
usbdev_pkt_t *pkt = ep->inlist.head;
if (!pkt)
return -EINVAL;
bufptr = &pkt->payload[index];
while ((au_readl(ep->reg->write_fifo_status) &
USBDEV_FSTAT_FCNT_MASK) < EP_FIFO_DEPTH) {
if (bufptr < pkt->payload + pkt->size) {
au_writel(*bufptr++, ep->reg->write_fifo);
write_count++;
} else {
break;
}
}
return write_count;
}
#endif
/*
* This routine is called to restart transmission of a packet.
* The endpoint's TSIZE must be set to the new packet's size,
* and DMA to the write FIFO needs to be restarted.
* EP spinlock must be held when calling.
*/
static void
kickstart_send_packet(endpoint_t * ep)
{
u32 cs;
usbdev_pkt_t *pkt = ep->inlist.head;
vdbg("%s: ep%d, pkt=%p", __FUNCTION__, ep->address, pkt);
if (!pkt) {
err("%s: head=NULL! list->count=%d", __FUNCTION__,
ep->inlist.count);
return;
}
dma_cache_wback_inv((unsigned long)pkt->payload, pkt->size);
/*
* make sure FIFO is empty
*/
flush_write_fifo(ep);
cs = au_readl(ep->reg->ctrl_stat) & USBDEV_CS_STALL;
cs |= (pkt->size << USBDEV_CS_TSIZE_BIT);
au_writel(cs, ep->reg->ctrl_stat);
if (get_dma_active_buffer(ep->indma) == 1) {
set_dma_count1(ep->indma, pkt->size);
set_dma_addr1(ep->indma, virt_to_phys(pkt->payload));
enable_dma_buffer1(ep->indma); // reenable
} else {
set_dma_count0(ep->indma, pkt->size);
set_dma_addr0(ep->indma, virt_to_phys(pkt->payload));
enable_dma_buffer0(ep->indma); // reenable
}
if (dma_halted(ep->indma))
start_dma(ep->indma);
}
/*
* This routine is called when a packet in the inlist has been
* completed. Frees the completed packet and starts sending the
* next. EP spinlock must be held when calling.
*/
static usbdev_pkt_t *
send_packet_complete(endpoint_t * ep)
{
usbdev_pkt_t *pkt = unlink_head(&ep->inlist);
if (pkt) {
pkt->status =
(au_readl(ep->reg->ctrl_stat) & USBDEV_CS_NAK) ?
PKT_STATUS_NAK : PKT_STATUS_ACK;
vdbg("%s: ep%d, %s pkt=%p, list count=%d", __FUNCTION__,
ep->address, (pkt->status & PKT_STATUS_NAK) ?
"NAK" : "ACK", pkt, ep->inlist.count);
}
/*
* The write fifo should already be drained if things are
* working right, but flush it anyway just in case.
*/
flush_write_fifo(ep);
// begin transmitting next packet in the inlist
if (ep->inlist.count) {
kickstart_send_packet(ep);
}
return pkt;
}
/*
* Add a new packet to the tail of the given ep's packet
* inlist. The transmit complete interrupt frees packets from
* the head of this list. EP spinlock must be held when calling.
*/
static int
send_packet(struct usb_dev* dev, usbdev_pkt_t *pkt, int async)
{
pkt_list_t *list;
endpoint_t* ep;
if (!pkt || !(ep = epaddr_to_ep(dev, pkt->ep_addr)))
return -EINVAL;
if (!pkt->size)
return 0;
list = &ep->inlist;
if (!async && list->count) {
halt_dma(ep->indma);
flush_pkt_list(list);
}
link_tail(ep, list, pkt);
vdbg("%s: ep%d, pkt=%p, size=%d, list count=%d", __FUNCTION__,
ep->address, pkt, pkt->size, list->count);
if (list->count == 1) {
/*
* if the packet count is one, it means the list was empty,
* and no more data will go out this ep until we kick-start
* it again.
*/
kickstart_send_packet(ep);
}
return pkt->size;
}
/*
* This routine is called to restart reception of a packet.
* EP spinlock must be held when calling.
*/
static void
kickstart_receive_packet(endpoint_t * ep)
{
usbdev_pkt_t *pkt;
// get and link a new packet for next reception
if (!(pkt = add_packet(ep, &ep->outlist, ep->max_pkt_size))) {
err("%s: could not alloc new packet", __FUNCTION__);
return;
}
if (get_dma_active_buffer(ep->outdma) == 1) {
clear_dma_done1(ep->outdma);
set_dma_count1(ep->outdma, ep->max_pkt_size);
set_dma_count0(ep->outdma, 0);
set_dma_addr1(ep->outdma, virt_to_phys(pkt->payload));
enable_dma_buffer1(ep->outdma); // reenable
} else {
clear_dma_done0(ep->outdma);
set_dma_count0(ep->outdma, ep->max_pkt_size);
set_dma_count1(ep->outdma, 0);
set_dma_addr0(ep->outdma, virt_to_phys(pkt->payload));
enable_dma_buffer0(ep->outdma); // reenable
}
if (dma_halted(ep->outdma))
start_dma(ep->outdma);
}
/*
* This routine is called when a packet in the outlist has been
* completed (received) and we need to prepare for a new packet
* to be received. Halts DMA and computes the packet size from the
* remaining DMA counter. Then prepares a new packet for reception
* and restarts DMA. FIXME: what if another packet comes in
* on top of the completed packet? Counter would be wrong.
* EP spinlock must be held when calling.
*/
static usbdev_pkt_t *
receive_packet_complete(endpoint_t * ep)
{
usbdev_pkt_t *pkt = ep->outlist.tail;
u32 cs;
halt_dma(ep->outdma);
cs = au_readl(ep->reg->ctrl_stat);
if (!pkt)
return NULL;
pkt->size = ep->max_pkt_size - get_dma_residue(ep->outdma);
if (pkt->size)
dma_cache_inv((unsigned long)pkt->payload, pkt->size);
/*
* need to pull out any remaining bytes in the FIFO.
*/
endpoint_fifo_read(ep);
/*
* should be drained now, but flush anyway just in case.
*/
flush_read_fifo(ep);
pkt->status = (cs & USBDEV_CS_NAK) ? PKT_STATUS_NAK : PKT_STATUS_ACK;
if (ep->address == 0 && (cs & USBDEV_CS_SU))
pkt->status |= PKT_STATUS_SU;
vdbg("%s: ep%d, %s pkt=%p, size=%d", __FUNCTION__,
ep->address, (pkt->status & PKT_STATUS_NAK) ?
"NAK" : "ACK", pkt, pkt->size);
kickstart_receive_packet(ep);
return pkt;
}
/*
****************************************************************************
* Here starts the standard device request handlers. They are
* all called by do_setup() via a table of function pointers.
****************************************************************************
*/
static ep0_stage_t
do_get_status(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
switch (setup->bRequestType) {
case 0x80: // Device
// FIXME: send device status
break;
case 0x81: // Interface
// FIXME: send interface status
break;
case 0x82: // End Point
// FIXME: send endpoint status
break;
default:
// Invalid Command
endpoint_stall(&dev->ep[0]); // Stall End Point 0
break;
}
return STATUS_STAGE;
}
static ep0_stage_t
do_clear_feature(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
switch (setup->bRequestType) {
case 0x00: // Device
if ((le16_to_cpu(setup->wValue) & 0xff) == 1)
dev->remote_wakeup_en = 0;
else
endpoint_stall(&dev->ep[0]);
break;
case 0x02: // End Point
if ((le16_to_cpu(setup->wValue) & 0xff) == 0) {
endpoint_t *ep =
epaddr_to_ep(dev,
le16_to_cpu(setup->wIndex) & 0xff);
endpoint_unstall(ep);
endpoint_reset_datatoggle(ep);
} else
endpoint_stall(&dev->ep[0]);
break;
}
return SETUP_STAGE;
}
static ep0_stage_t
do_reserved(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
// Invalid request, stall End Point 0
endpoint_stall(&dev->ep[0]);
return SETUP_STAGE;
}
static ep0_stage_t
do_set_feature(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
switch (setup->bRequestType) {
case 0x00: // Device
if ((le16_to_cpu(setup->wValue) & 0xff) == 1)
dev->remote_wakeup_en = 1;
else
endpoint_stall(&dev->ep[0]);
break;
case 0x02: // End Point
if ((le16_to_cpu(setup->wValue) & 0xff) == 0) {
endpoint_t *ep =
epaddr_to_ep(dev,
le16_to_cpu(setup->wIndex) & 0xff);
endpoint_stall(ep);
} else
endpoint_stall(&dev->ep[0]);
break;
}
return SETUP_STAGE;
}
static ep0_stage_t
do_set_address(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
int new_state = dev->state;
int new_addr = le16_to_cpu(setup->wValue);
dbg("%s: our address=%d", __FUNCTION__, new_addr);
if (new_addr > 127) {
// usb spec doesn't tell us what to do, so just go to
// default state
new_state = DEFAULT;
dev->address = 0;
} else if (dev->address != new_addr) {
dev->address = new_addr;
new_state = ADDRESS;
}
if (dev->state != new_state) {
dev->state = new_state;
/* inform function layer of usbdev state change */
dev->func_cb(CB_NEW_STATE, dev->state, dev->cb_data);
}
return SETUP_STAGE;
}
static ep0_stage_t
do_get_descriptor(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
int strnum, desc_len = le16_to_cpu(setup->wLength);
switch (le16_to_cpu(setup->wValue) >> 8) {
case USB_DT_DEVICE:
// send device descriptor!
desc_len = desc_len > dev->dev_desc->bLength ?
dev->dev_desc->bLength : desc_len;
dbg("sending device desc, size=%d", desc_len);
send_packet(dev, alloc_packet(&dev->ep[0], desc_len,
dev->dev_desc), 0);
break;
case USB_DT_CONFIG:
// If the config descr index in low-byte of
// setup->wValue is valid, send config descr,
// otherwise stall ep0.
if ((le16_to_cpu(setup->wValue) & 0xff) == 0) {
// send config descriptor!
if (desc_len <= USB_DT_CONFIG_SIZE) {
dbg("sending partial config desc, size=%d",
desc_len);
send_packet(dev,
alloc_packet(&dev->ep[0],
desc_len,
dev->conf_desc),
0);
} else {
int len = le16_to_cpu(dev->conf_desc->wTotalLength);
dbg("sending whole config desc,"
" size=%d, our size=%d", desc_len, len);
desc_len = desc_len > len ? len : desc_len;
send_packet(dev,
alloc_packet(&dev->ep[0],
desc_len,
dev->full_conf_desc),
0);
}
} else
endpoint_stall(&dev->ep[0]);
break;
case USB_DT_STRING:
// If the string descr index in low-byte of setup->wValue
// is valid, send string descr, otherwise stall ep0.
strnum = le16_to_cpu(setup->wValue) & 0xff;
if (strnum >= 0 && strnum < 6) {
struct usb_string_descriptor *desc =
dev->str_desc[strnum];
desc_len = desc_len > desc->bLength ?
desc->bLength : desc_len;
dbg("sending string desc %d", strnum);
send_packet(dev,
alloc_packet(&dev->ep[0], desc_len,
desc), 0);
} else
endpoint_stall(&dev->ep[0]);
break;
default:
// Invalid request
err("invalid get desc=%d, stalled",
le16_to_cpu(setup->wValue) >> 8);
endpoint_stall(&dev->ep[0]); // Stall endpoint 0
break;
}
return STATUS_STAGE;
}
static ep0_stage_t
do_set_descriptor(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
// TODO: implement
// there will be an OUT data stage (the descriptor to set)
return DATA_STAGE;
}
static ep0_stage_t
do_get_configuration(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
// send dev->configuration
dbg("sending config");
send_packet(dev, alloc_packet(&dev->ep[0], 1, &dev->configuration),
0);
return STATUS_STAGE;
}
static ep0_stage_t
do_set_configuration(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
// set active config to low-byte of setup->wValue
dev->configuration = le16_to_cpu(setup->wValue) & 0xff;
dbg("set config, config=%d", dev->configuration);
if (!dev->configuration && dev->state > DEFAULT) {
dev->state = ADDRESS;
/* inform function layer of usbdev state change */
dev->func_cb(CB_NEW_STATE, dev->state, dev->cb_data);
} else if (dev->configuration == 1) {
dev->state = CONFIGURED;
/* inform function layer of usbdev state change */
dev->func_cb(CB_NEW_STATE, dev->state, dev->cb_data);
} else {
// FIXME: "respond with request error" - how?
}
return SETUP_STAGE;
}
static ep0_stage_t
do_get_interface(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
// interface must be zero.
if ((le16_to_cpu(setup->wIndex) & 0xff) || dev->state == ADDRESS) {
// FIXME: respond with "request error". how?
} else if (dev->state == CONFIGURED) {
// send dev->alternate_setting
dbg("sending alt setting");
send_packet(dev, alloc_packet(&dev->ep[0], 1,
&dev->alternate_setting), 0);
}
return STATUS_STAGE;
}
static ep0_stage_t
do_set_interface(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
if (dev->state == ADDRESS) {
// FIXME: respond with "request error". how?
} else if (dev->state == CONFIGURED) {
dev->interface = le16_to_cpu(setup->wIndex) & 0xff;
dev->alternate_setting =
le16_to_cpu(setup->wValue) & 0xff;
// interface and alternate_setting must be zero
if (dev->interface || dev->alternate_setting) {
// FIXME: respond with "request error". how?
}
}
return SETUP_STAGE;
}
static ep0_stage_t
do_synch_frame(struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
// TODO
return SETUP_STAGE;
}
typedef ep0_stage_t (*req_method_t)(struct usb_dev* dev,
struct usb_ctrlrequest* setup);
/* Table of the standard device request handlers */
static const req_method_t req_method[] = {
do_get_status,
do_clear_feature,
do_reserved,
do_set_feature,
do_reserved,
do_set_address,
do_get_descriptor,
do_set_descriptor,
do_get_configuration,
do_set_configuration,
do_get_interface,
do_set_interface,
do_synch_frame
};
// SETUP packet request dispatcher
static void
do_setup (struct usb_dev* dev, struct usb_ctrlrequest* setup)
{
req_method_t m;
dbg("%s: req %d %s", __FUNCTION__, setup->bRequestType,
get_std_req_name(setup->bRequestType));
if ((setup->bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD ||
(setup->bRequestType & USB_RECIP_MASK) != USB_RECIP_DEVICE) {
err("%s: invalid requesttype 0x%02x", __FUNCTION__,
setup->bRequestType);
return;
}
if ((setup->bRequestType & 0x80) == USB_DIR_OUT && setup->wLength)
dbg("%s: OUT phase! length=%d", __FUNCTION__, setup->wLength);
if (setup->bRequestType < sizeof(req_method)/sizeof(req_method_t))
m = req_method[setup->bRequestType];
else
m = do_reserved;
dev->ep0_stage = (*m)(dev, setup);
}
/*
* A SETUP, DATA0, or DATA1 packet has been received
* on the default control endpoint's fifo.
*/
static void
process_ep0_receive (struct usb_dev* dev)
{
endpoint_t *ep0 = &dev->ep[0];
usbdev_pkt_t *pkt;
spin_lock(&ep0->lock);
// complete packet and prepare a new packet
pkt = receive_packet_complete(ep0);
if (!pkt) {
// FIXME: should put a warn/err here.
spin_unlock(&ep0->lock);
return;
}
// unlink immediately from endpoint.
unlink_head(&ep0->outlist);
// override current stage if h/w says it's a setup packet
if (pkt->status & PKT_STATUS_SU)
dev->ep0_stage = SETUP_STAGE;
switch (dev->ep0_stage) {
case SETUP_STAGE:
vdbg("SU bit is %s in setup stage",
(pkt->status & PKT_STATUS_SU) ? "set" : "not set");
if (pkt->size == sizeof(struct usb_ctrlrequest)) {
#ifdef VDEBUG
if (pkt->status & PKT_STATUS_ACK)
vdbg("received SETUP");
else
vdbg("received NAK SETUP");
#endif
do_setup(dev, (struct usb_ctrlrequest*)pkt->payload);
} else
err("%s: wrong size SETUP received", __FUNCTION__);
break;
case DATA_STAGE:
/*
* this setup has an OUT data stage. Of the standard
* device requests, only set_descriptor has this stage,
* so this packet is that descriptor. TODO: drop it for
* now, set_descriptor not implemented.
*
* Need to place a byte in the write FIFO here, to prepare
* to send a zero-length DATA ack packet to the host in the
* STATUS stage.
*/
au_writel(0, ep0->reg->write_fifo);
dbg("received OUT stage DATAx on EP0, size=%d", pkt->size);
dev->ep0_stage = SETUP_STAGE;
break;
case STATUS_STAGE:
// this setup had an IN data stage, and host is ACK'ing
// the packet we sent during that stage.
if (pkt->size != 0)
warn("received non-zero ACK on EP0??");
#ifdef VDEBUG
else
vdbg("received ACK on EP0");
#endif
dev->ep0_stage = SETUP_STAGE;
break;
}
spin_unlock(&ep0->lock);
// we're done processing the packet, free it
kfree(pkt);
}
/*
* A DATA0/1 packet has been received on one of the OUT endpoints (4 or 5)
*/
static void
process_ep_receive (struct usb_dev* dev, endpoint_t *ep)
{
usbdev_pkt_t *pkt;
spin_lock(&ep->lock);
pkt = receive_packet_complete(ep);
spin_unlock(&ep->lock);
dev->func_cb(CB_PKT_COMPLETE, (unsigned long)pkt, dev->cb_data);
}
/* This ISR handles the receive complete and suspend events */
static void
req_sus_intr (int irq, void *dev_id, struct pt_regs *regs)
{
struct usb_dev *dev = (struct usb_dev *) dev_id;
u32 status;
status = au_readl(USBD_INTSTAT);
au_writel(status, USBD_INTSTAT); // ack'em
if (status & (1<<0))
process_ep0_receive(dev);
if (status & (1<<4))
process_ep_receive(dev, &dev->ep[4]);
if (status & (1<<5))
process_ep_receive(dev, &dev->ep[5]);
}
/* This ISR handles the DMA done events on EP0 */
static void
dma_done_ep0_intr(int irq, void *dev_id, struct pt_regs *regs)
{
struct usb_dev *dev = (struct usb_dev *) dev_id;
usbdev_pkt_t* pkt;
endpoint_t *ep0 = &dev->ep[0];
u32 cs0, buff_done;
spin_lock(&ep0->lock);
cs0 = au_readl(ep0->reg->ctrl_stat);
// first check packet transmit done
if ((buff_done = get_dma_buffer_done(ep0->indma)) != 0) {
// transmitted a DATAx packet during DATA stage
// on control endpoint 0
// clear DMA done bit
if (buff_done & DMA_D0)
clear_dma_done0(ep0->indma);
if (buff_done & DMA_D1)
clear_dma_done1(ep0->indma);
pkt = send_packet_complete(ep0);
kfree(pkt);
}
/*
* Now check packet receive done. Shouldn't get these,
* the receive packet complete intr should happen
* before the DMA done intr occurs.
*/
if ((buff_done = get_dma_buffer_done(ep0->outdma)) != 0) {
// clear DMA done bit
if (buff_done & DMA_D0)
clear_dma_done0(ep0->outdma);
if (buff_done & DMA_D1)
clear_dma_done1(ep0->outdma);
//process_ep0_receive(dev);
}
spin_unlock(&ep0->lock);
}
/* This ISR handles the DMA done events on endpoints 2,3,4,5 */
static void
dma_done_ep_intr(int irq, void *dev_id, struct pt_regs *regs)
{
struct usb_dev *dev = (struct usb_dev *) dev_id;
int i;
for (i = 2; i < 6; i++) {
u32 buff_done;
usbdev_pkt_t* pkt;
endpoint_t *ep = &dev->ep[i];
if (!ep->active) continue;
spin_lock(&ep->lock);
if (ep->direction == USB_DIR_IN) {
buff_done = get_dma_buffer_done(ep->indma);
if (buff_done != 0) {
// transmitted a DATAx pkt on the IN ep
// clear DMA done bit
if (buff_done & DMA_D0)
clear_dma_done0(ep->indma);
if (buff_done & DMA_D1)
clear_dma_done1(ep->indma);
pkt = send_packet_complete(ep);
spin_unlock(&ep->lock);
dev->func_cb(CB_PKT_COMPLETE,
(unsigned long)pkt,
dev->cb_data);
spin_lock(&ep->lock);
}
} else {
/*
* Check packet receive done (OUT ep). Shouldn't get
* these, the rx packet complete intr should happen
* before the DMA done intr occurs.
*/
buff_done = get_dma_buffer_done(ep->outdma);
if (buff_done != 0) {
// received a DATAx pkt on the OUT ep
// clear DMA done bit
if (buff_done & DMA_D0)
clear_dma_done0(ep->outdma);
if (buff_done & DMA_D1)
clear_dma_done1(ep->outdma);
//process_ep_receive(dev, ep);
}
}
spin_unlock(&ep->lock);
}
}
/***************************************************************************
* Here begins the external interface functions
***************************************************************************
*/
/*
* allocate a new packet
*/
int
usbdev_alloc_packet(int ep_addr, int data_size, usbdev_pkt_t** pkt)
{
endpoint_t * ep = epaddr_to_ep(&usbdev, ep_addr);
usbdev_pkt_t* lpkt = NULL;
if (!ep || !ep->active || ep->address < 2)
return -ENODEV;
if (data_size > ep->max_pkt_size)
return -EINVAL;
lpkt = *pkt = alloc_packet(ep, data_size, NULL);
if (!lpkt)
return -ENOMEM;
return 0;
}
/*
* packet send
*/
int
usbdev_send_packet(int ep_addr, usbdev_pkt_t * pkt)
{
unsigned long flags;
int count;
endpoint_t * ep;
if (!pkt || !(ep = epaddr_to_ep(&usbdev, pkt->ep_addr)) ||
!ep->active || ep->address < 2)
return -ENODEV;
if (ep->direction != USB_DIR_IN)
return -EINVAL;
spin_lock_irqsave(&ep->lock, flags);
count = send_packet(&usbdev, pkt, 1);
spin_unlock_irqrestore(&ep->lock, flags);
return count;
}
/*
* packet receive
*/
int
usbdev_receive_packet(int ep_addr, usbdev_pkt_t** pkt)
{
unsigned long flags;
usbdev_pkt_t* lpkt = NULL;
endpoint_t *ep = epaddr_to_ep(&usbdev, ep_addr);
if (!ep || !ep->active || ep->address < 2)
return -ENODEV;
if (ep->direction != USB_DIR_OUT)
return -EINVAL;
spin_lock_irqsave(&ep->lock, flags);
if (ep->outlist.count > 1)
lpkt = unlink_head(&ep->outlist);
spin_unlock_irqrestore(&ep->lock, flags);
if (!lpkt) {
/* no packet available */
*pkt = NULL;
return -ENODATA;
}
*pkt = lpkt;
return lpkt->size;
}
/*
* return total queued byte count on the endpoint.
*/
int
usbdev_get_byte_count(int ep_addr)
{
unsigned long flags;
pkt_list_t *list;
usbdev_pkt_t *scan;
int count = 0;
endpoint_t * ep = epaddr_to_ep(&usbdev, ep_addr);
if (!ep || !ep->active || ep->address < 2)
return -ENODEV;
if (ep->direction == USB_DIR_IN) {
list = &ep->inlist;
spin_lock_irqsave(&ep->lock, flags);
for (scan = list->head; scan; scan = scan->next)
count += scan->size;
spin_unlock_irqrestore(&ep->lock, flags);
} else {
list = &ep->outlist;
spin_lock_irqsave(&ep->lock, flags);
if (list->count > 1) {
for (scan = list->head; scan != list->tail;
scan = scan->next)
count += scan->size;
}
spin_unlock_irqrestore(&ep->lock, flags);
}
return count;
}
void
usbdev_exit(void)
{
endpoint_t *ep;
int i;
au_writel(0, USBD_INTEN); // disable usb dev ints
au_writel(0, USBD_ENABLE); // disable usb dev
free_irq(AU1000_USB_DEV_REQ_INT, &usbdev);
free_irq(AU1000_USB_DEV_SUS_INT, &usbdev);
// free all control endpoint resources
ep = &usbdev.ep[0];
free_au1000_dma(ep->indma);
free_au1000_dma(ep->outdma);
endpoint_flush(ep);
// free ep resources
for (i = 2; i < 6; i++) {
ep = &usbdev.ep[i];
if (!ep->active) continue;
if (ep->direction == USB_DIR_IN) {
free_au1000_dma(ep->indma);
} else {
free_au1000_dma(ep->outdma);
}
endpoint_flush(ep);
}
kfree(usbdev.full_conf_desc);
}
int
usbdev_init(struct usb_device_descriptor* dev_desc,
struct usb_config_descriptor* config_desc,
struct usb_interface_descriptor* if_desc,
struct usb_endpoint_descriptor* ep_desc,
struct usb_string_descriptor* str_desc[],
void (*cb)(usbdev_cb_type_t, unsigned long, void *),
void* cb_data)
{
endpoint_t *ep0;
int i, ret=0;
u8* fcd;
if (dev_desc->bNumConfigurations > 1 ||
config_desc->bNumInterfaces > 1 ||
if_desc->bNumEndpoints > 4) {
err("Only one config, one i/f, and no more "
"than 4 ep's allowed");
ret = -EINVAL;
goto out;
}
if (!cb) {
err("Function-layer callback required");
ret = -EINVAL;
goto out;
}
if (dev_desc->bMaxPacketSize0 != USBDEV_EP0_MAX_PACKET_SIZE) {
warn("EP0 Max Packet size must be %d",
USBDEV_EP0_MAX_PACKET_SIZE);
dev_desc->bMaxPacketSize0 = USBDEV_EP0_MAX_PACKET_SIZE;
}
memset(&usbdev, 0, sizeof(struct usb_dev));
usbdev.state = DEFAULT;
usbdev.dev_desc = dev_desc;
usbdev.if_desc = if_desc;
usbdev.conf_desc = config_desc;
for (i=0; i<6; i++)
usbdev.str_desc[i] = str_desc[i];
usbdev.func_cb = cb;
usbdev.cb_data = cb_data;
/* Initialize default control endpoint */
ep0 = &usbdev.ep[0];
ep0->active = 1;
ep0->type = CONTROL_EP;
ep0->max_pkt_size = USBDEV_EP0_MAX_PACKET_SIZE;
spin_lock_init(&ep0->lock);
ep0->desc = NULL; // ep0 has no descriptor
ep0->address = 0;
ep0->direction = 0;
ep0->reg = &ep_reg[0];
/* Initialize the other requested endpoints */
for (i = 0; i < if_desc->bNumEndpoints; i++) {
struct usb_endpoint_descriptor* epd = &ep_desc[i];
endpoint_t *ep;
if ((epd->bEndpointAddress & 0x80) == USB_DIR_IN) {
ep = &usbdev.ep[2];
ep->address = 2;
if (ep->active) {
ep = &usbdev.ep[3];
ep->address = 3;
if (ep->active) {
err("too many IN ep's requested");
ret = -ENODEV;
goto out;
}
}
} else {
ep = &usbdev.ep[4];
ep->address = 4;
if (ep->active) {
ep = &usbdev.ep[5];
ep->address = 5;
if (ep->active) {
err("too many OUT ep's requested");
ret = -ENODEV;
goto out;
}
}
}
ep->active = 1;
epd->bEndpointAddress &= ~0x0f;
epd->bEndpointAddress |= (u8)ep->address;
ep->direction = epd->bEndpointAddress & 0x80;
ep->type = epd->bmAttributes & 0x03;
ep->max_pkt_size = le16_to_cpu(epd->wMaxPacketSize);
spin_lock_init(&ep->lock);
ep->desc = epd;
ep->reg = &ep_reg[ep->address];
}
/*
* initialize the full config descriptor
*/
usbdev.full_conf_desc = fcd = kmalloc(le16_to_cpu(config_desc->wTotalLength),
ALLOC_FLAGS);
if (!fcd) {
err("failed to alloc full config descriptor");
ret = -ENOMEM;
goto out;
}
memcpy(fcd, config_desc, USB_DT_CONFIG_SIZE);
fcd += USB_DT_CONFIG_SIZE;
memcpy(fcd, if_desc, USB_DT_INTERFACE_SIZE);
fcd += USB_DT_INTERFACE_SIZE;
for (i = 0; i < if_desc->bNumEndpoints; i++) {
memcpy(fcd, &ep_desc[i], USB_DT_ENDPOINT_SIZE);
fcd += USB_DT_ENDPOINT_SIZE;
}
/* Now we're ready to enable the controller */
au_writel(0x0002, USBD_ENABLE);
udelay(100);
au_writel(0x0003, USBD_ENABLE);
udelay(100);
/* build and send config table based on ep descriptors */
for (i = 0; i < 6; i++) {
endpoint_t *ep;
if (i == 1)
continue; // skip dummy ep
ep = &usbdev.ep[i];
if (ep->active) {
au_writel((ep->address << 4) | 0x04, USBD_CONFIG);
au_writel(((ep->max_pkt_size & 0x380) >> 7) |
(ep->direction >> 4) | (ep->type << 4),
USBD_CONFIG);
au_writel((ep->max_pkt_size & 0x7f) << 1, USBD_CONFIG);
au_writel(0x00, USBD_CONFIG);
au_writel(ep->address, USBD_CONFIG);
} else {
u8 dir = (i==2 || i==3) ? DIR_IN : DIR_OUT;
au_writel((i << 4) | 0x04, USBD_CONFIG);
au_writel(((16 & 0x380) >> 7) | dir |
(BULK_EP << 4), USBD_CONFIG);
au_writel((16 & 0x7f) << 1, USBD_CONFIG);
au_writel(0x00, USBD_CONFIG);
au_writel(i, USBD_CONFIG);
}
}
/*
* Enable Receive FIFO Complete interrupts only. Transmit
* complete is being handled by the DMA done interrupts.
*/
au_writel(0x31, USBD_INTEN);
/*
* Controller is now enabled, request DMA and IRQ
* resources.
*/
/* request the USB device transfer complete interrupt */
if (request_irq(AU1000_USB_DEV_REQ_INT, req_sus_intr, SA_INTERRUPT,
"USBdev req", &usbdev)) {
err("Can't get device request intr");
ret = -ENXIO;
goto out;
}
/* request the USB device suspend interrupt */
if (request_irq(AU1000_USB_DEV_SUS_INT, req_sus_intr, SA_INTERRUPT,
"USBdev sus", &usbdev)) {
err("Can't get device suspend intr");
ret = -ENXIO;
goto out;
}
/* Request EP0 DMA and IRQ */
if ((ep0->indma = request_au1000_dma(ep_dma_id[0].id,
ep_dma_id[0].str,
dma_done_ep0_intr,
SA_INTERRUPT,
&usbdev)) < 0) {
err("Can't get %s DMA", ep_dma_id[0].str);
ret = -ENXIO;
goto out;
}
if ((ep0->outdma = request_au1000_dma(ep_dma_id[1].id,
ep_dma_id[1].str,
NULL, 0, NULL)) < 0) {
err("Can't get %s DMA", ep_dma_id[1].str);
ret = -ENXIO;
goto out;
}
// Flush the ep0 buffers and FIFOs
endpoint_flush(ep0);
// start packet reception on ep0
kickstart_receive_packet(ep0);
/* Request DMA and IRQ for the other endpoints */
for (i = 2; i < 6; i++) {
endpoint_t *ep = &usbdev.ep[i];
if (!ep->active)
continue;
// Flush the endpoint buffers and FIFOs
endpoint_flush(ep);
if (ep->direction == USB_DIR_IN) {
ep->indma =
request_au1000_dma(ep_dma_id[ep->address].id,
ep_dma_id[ep->address].str,
dma_done_ep_intr,
SA_INTERRUPT,
&usbdev);
if (ep->indma < 0) {
err("Can't get %s DMA",
ep_dma_id[ep->address].str);
ret = -ENXIO;
goto out;
}
} else {
ep->outdma =
request_au1000_dma(ep_dma_id[ep->address].id,
ep_dma_id[ep->address].str,
NULL, 0, NULL);
if (ep->outdma < 0) {
err("Can't get %s DMA",
ep_dma_id[ep->address].str);
ret = -ENXIO;
goto out;
}
// start packet reception on OUT endpoint
kickstart_receive_packet(ep);
}
}
out:
if (ret)
usbdev_exit();
return ret;
}
EXPORT_SYMBOL(usbdev_init);
EXPORT_SYMBOL(usbdev_exit);
EXPORT_SYMBOL(usbdev_alloc_packet);
EXPORT_SYMBOL(usbdev_receive_packet);
EXPORT_SYMBOL(usbdev_send_packet);
EXPORT_SYMBOL(usbdev_get_byte_count);
