// SPDX-License-Identifier: GPL-2.0+
/*
* c67x00-sched.c: Cypress C67X00 USB Host Controller Driver - TD scheduling
*
* Copyright (C) 2006-2008 Barco N.V.
* Derived from the Cypress cy7c67200/300 ezusb linux driver and
* based on multiple host controller drivers inside the linux kernel.
*/
#include <linux/kthread.h>
#include <linux/slab.h>
#include "c67x00.h"
#include "c67x00-hcd.h"
/*
* These are the stages for a control urb, they are kept
* in both urb->interval and td->privdata.
*/
#define SETUP_STAGE 0
#define DATA_STAGE 1
#define STATUS_STAGE 2
/* -------------------------------------------------------------------------- */
/*
* struct c67x00_ep_data: Host endpoint data structure
*/
struct c67x00_ep_data {
struct list_head queue;
struct list_head node;
struct usb_host_endpoint *hep;
struct usb_device *dev;
u16 next_frame; /* For int/isoc transactions */
};
/*
* struct c67x00_td
*
* Hardware parts are little endiannes, SW in CPU endianess.
*/
struct c67x00_td {
/* HW specific part */
__le16 ly_base_addr; /* Bytes 0-1 */
__le16 port_length; /* Bytes 2-3 */
u8 pid_ep; /* Byte 4 */
u8 dev_addr; /* Byte 5 */
u8 ctrl_reg; /* Byte 6 */
u8 status; /* Byte 7 */
u8 retry_cnt; /* Byte 8 */
#define TT_OFFSET 2
#define TT_CONTROL 0
#define TT_ISOCHRONOUS 1
#define TT_BULK 2
#define TT_INTERRUPT 3
u8 residue; /* Byte 9 */
__le16 next_td_addr; /* Bytes 10-11 */
/* SW part */
struct list_head td_list;
u16 td_addr;
void *data;
struct urb *urb;
unsigned long privdata;
/* These are needed for handling the toggle bits:
* an urb can be dequeued while a td is in progress
* after checking the td, the toggle bit might need to
* be fixed */
struct c67x00_ep_data *ep_data;
unsigned int pipe;
};
struct c67x00_urb_priv {
struct list_head hep_node;
struct urb *urb;
int port;
int cnt; /* packet number for isoc */
int status;
struct c67x00_ep_data *ep_data;
};
#define td_udev(td) ((td)->ep_data->dev)
#define CY_TD_SIZE 12
#define TD_PIDEP_OFFSET 0x04
#define TD_PIDEPMASK_PID 0xF0
#define TD_PIDEPMASK_EP 0x0F
#define TD_PORTLENMASK_DL 0x03FF
#define TD_PORTLENMASK_PN 0xC000
#define TD_STATUS_OFFSET 0x07
#define TD_STATUSMASK_ACK 0x01
#define TD_STATUSMASK_ERR 0x02
#define TD_STATUSMASK_TMOUT 0x04
#define TD_STATUSMASK_SEQ 0x08
#define TD_STATUSMASK_SETUP 0x10
#define TD_STATUSMASK_OVF 0x20
#define TD_STATUSMASK_NAK 0x40
#define TD_STATUSMASK_STALL 0x80
#define TD_ERROR_MASK (TD_STATUSMASK_ERR | TD_STATUSMASK_TMOUT | \
TD_STATUSMASK_STALL)
#define TD_RETRYCNT_OFFSET 0x08
#define TD_RETRYCNTMASK_ACT_FLG 0x10
#define TD_RETRYCNTMASK_TX_TYPE 0x0C
#define TD_RETRYCNTMASK_RTY_CNT 0x03
#define TD_RESIDUE_OVERFLOW 0x80
#define TD_PID_IN 0x90
/* Residue: signed 8bits, neg -> OVERFLOW, pos -> UNDERFLOW */
#define td_residue(td) ((__s8)(td->residue))
#define td_ly_base_addr(td) (__le16_to_cpu((td)->ly_base_addr))
#define td_port_length(td) (__le16_to_cpu((td)->port_length))
#define td_next_td_addr(td) (__le16_to_cpu((td)->next_td_addr))
#define td_active(td) ((td)->retry_cnt & TD_RETRYCNTMASK_ACT_FLG)
#define td_length(td) (td_port_length(td) & TD_PORTLENMASK_DL)
#define td_sequence_ok(td) (!td->status || \
(!(td->status & TD_STATUSMASK_SEQ) == \
!(td->ctrl_reg & SEQ_SEL)))
#define td_acked(td) (!td->status || \
(td->status & TD_STATUSMASK_ACK))
#define td_actual_bytes(td) (td_length(td) - td_residue(td))
/* -------------------------------------------------------------------------- */
/*
* dbg_td - Dump the contents of the TD
*/
static void dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg)
{
struct device *dev = c67x00_hcd_dev(c67x00);
dev_dbg(dev, "### %s at 0x%04x\n", msg, td->td_addr);
dev_dbg(dev, "urb: 0x%p\n", td->urb);
dev_dbg(dev, "endpoint: %4d\n", usb_pipeendpoint(td->pipe));
dev_dbg(dev, "pipeout: %4d\n", usb_pipeout(td->pipe));
dev_dbg(dev, "ly_base_addr: 0x%04x\n", td_ly_base_addr(td));
dev_dbg(dev, "port_length: 0x%04x\n", td_port_length(td));
dev_dbg(dev, "pid_ep: 0x%02x\n", td->pid_ep);
dev_dbg(dev, "dev_addr: 0x%02x\n", td->dev_addr);
dev_dbg(dev, "ctrl_reg: 0x%02x\n", td->ctrl_reg);
dev_dbg(dev, "status: 0x%02x\n", td->status);
dev_dbg(dev, "retry_cnt: 0x%02x\n", td->retry_cnt);
dev_dbg(dev, "residue: 0x%02x\n", td->residue);
dev_dbg(dev, "next_td_addr: 0x%04x\n", td_next_td_addr(td));
dev_dbg(dev, "data: %*ph\n", td_length(td), td->data);
}
/* -------------------------------------------------------------------------- */
/* Helper functions */
static inline u16 c67x00_get_current_frame_number(struct c67x00_hcd *c67x00)
{
return c67x00_ll_husb_get_frame(c67x00->sie) & HOST_FRAME_MASK;
}
/*
* frame_add
* Software wraparound for framenumbers.
*/
static inline u16 frame_add(u16 a, u16 b)
{
return (a + b) & HOST_FRAME_MASK;
}
/*
* frame_after - is frame a after frame b
*/
static inline int frame_after(u16 a, u16 b)
{
return ((HOST_FRAME_MASK + a - b) & HOST_FRAME_MASK) <
(HOST_FRAME_MASK / 2);
}
/*
* frame_after_eq - is frame a after or equal to frame b
*/
static inline int frame_after_eq(u16 a, u16 b)
{
return ((HOST_FRAME_MASK + 1 + a - b) & HOST_FRAME_MASK) <
(HOST_FRAME_MASK / 2);
}
/* -------------------------------------------------------------------------- */
/*
* c67x00_release_urb - remove link from all tds to this urb
* Disconnects the urb from it's tds, so that it can be given back.
* pre: urb->hcpriv != NULL
*/
static void c67x00_release_urb(struct c67x00_hcd *c67x00, struct urb *urb)
{
struct c67x00_td *td;
struct c67x00_urb_priv *urbp;
BUG_ON(!urb);
c67x00->urb_count--;
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
c67x00->urb_iso_count--;
if (c67x00->urb_iso_count == 0)
c67x00->max_frame_bw = MAX_FRAME_BW_STD;
}
/* TODO this might be not so efficient when we've got many urbs!
* Alternatives:
* * only clear when needed
* * keep a list of tds with each urbp
*/
list_for_each_entry(td, &c67x00->td_list, td_list)
if (urb == td->urb)
td->urb = NULL;
urbp = urb->hcpriv;
urb->hcpriv = NULL;
list_del(&urbp->hep_node);
kfree(urbp);
}
/* -------------------------------------------------------------------------- */
static struct c67x00_ep_data *
c67x00_ep_data_alloc(struct c67x00_hcd *c67x00, struct urb *urb)
{
struct usb_host_endpoint *hep = urb->ep;
struct c67x00_ep_data *ep_data;
int type;
c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
/* Check if endpoint already has a c67x00_ep_data struct allocated */
if (hep->hcpriv) {
ep_data = hep->hcpriv;
if (frame_after(c67x00->current_frame, ep_data->next_frame))
ep_data->next_frame =
frame_add(c67x00->current_frame, 1);
return hep->hcpriv;
}
/* Allocate and initialize a new c67x00 endpoint data structure */
ep_data = kzalloc(sizeof(*ep_data), GFP_ATOMIC);
if (!ep_data)
return NULL;
INIT_LIST_HEAD(&ep_data->queue);
INIT_LIST_HEAD(&ep_data->node);
ep_data->hep = hep;
/* hold a reference to udev as long as this endpoint lives,
* this is needed to possibly fix the data toggle */
ep_data->dev = usb_get_dev(urb->dev);
hep->hcpriv = ep_data;
/* For ISOC and INT endpoints, start ASAP: */
ep_data->next_frame = frame_add(c67x00->current_frame, 1);
/* Add the endpoint data to one of the pipe lists; must be added
in order of endpoint address */
type = usb_pipetype(urb->pipe);
if (list_empty(&ep_data->node)) {
list_add(&ep_data->node, &c67x00->list[type]);
} else {
struct c67x00_ep_data *prev;
list_for_each_entry(prev, &c67x00->list[type], node) {
if (prev->hep->desc.bEndpointAddress >
hep->desc.bEndpointAddress) {
list_add(&ep_data->node, prev->node.prev);
break;
}
}
}
return ep_data;
}
static int c67x00_ep_data_free(struct usb_host_endpoint *hep)
{
struct c67x00_ep_data *ep_data = hep->hcpriv;
if (!ep_data)
return 0;
if (!list_empty(&ep_data->queue))
return -EBUSY;
usb_put_dev(ep_data->dev);
list_del(&ep_data->queue);
list_del(&ep_data->node);
kfree(ep_data);
hep->hcpriv = NULL;
return 0;
}
void c67x00_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
{
struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
unsigned long flags;
if (!list_empty(&ep->urb_list))
dev_warn(c67x00_hcd_dev(c67x00), "error: urb list not empty\n");
spin_lock_irqsave(&c67x00->lock, flags);
/* loop waiting for all transfers in the endpoint queue to complete */
while (c67x00_ep_data_free(ep)) {
/* Drop the lock so we can sleep waiting for the hardware */
spin_unlock_irqrestore(&c67x00->lock, flags);
/* it could happen that we reinitialize this completion, while
* somebody was waiting for that completion. The timeout and
* while loop handle such cases, but this might be improved */
reinit_completion(&c67x00->endpoint_disable);
c67x00_sched_kick(c67x00);
wait_for_completion_timeout(&c67x00->endpoint_disable, 1 * HZ);
spin_lock_irqsave(&c67x00->lock, flags);
}
spin_unlock_irqrestore(&c67x00->lock, flags);
}
/* -------------------------------------------------------------------------- */
static inline int get_root_port(struct usb_device *dev)
{
while (dev->parent->parent)
dev = dev->parent;
return dev->portnum;
}
int c67x00_urb_enqueue(struct usb_hcd *hcd,
struct urb *urb, gfp_t mem_flags)
{
int ret;
unsigned long flags;
struct c67x00_urb_priv *urbp;
struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
int port = get_root_port(urb->dev)-1;
/* Allocate and initialize urb private data */
urbp = kzalloc(sizeof(*urbp), mem_flags);
if (!urbp) {
ret = -ENOMEM;
goto err_urbp;
}
spin_lock_irqsave(&c67x00->lock, flags);
/* Make sure host controller is running */
if (!HC_IS_RUNNING(hcd->state)) {
ret = -ENODEV;
goto err_not_linked;
}
ret = usb_hcd_link_urb_to_ep(hcd, urb);
if (ret)
goto err_not_linked;
INIT_LIST_HEAD(&urbp->hep_node);
urbp->urb = urb;
urbp->port = port;
urbp->ep_data = c67x00_ep_data_alloc(c67x00, urb);
if (!urbp->ep_data) {
ret = -ENOMEM;
goto err_epdata;
}
/* TODO claim bandwidth with usb_claim_bandwidth?
* also release it somewhere! */
urb->hcpriv = urbp;
urb->actual_length = 0; /* Nothing received/transmitted yet */
switch (usb_pipetype(urb->pipe)) {
case PIPE_CONTROL:
urb->interval = SETUP_STAGE;
break;
case PIPE_INTERRUPT:
break;
case PIPE_BULK:
break;
case PIPE_ISOCHRONOUS:
if (c67x00->urb_iso_count == 0)
c67x00->max_frame_bw = MAX_FRAME_BW_ISO;
c67x00->urb_iso_count++;
/* Assume always URB_ISO_ASAP, FIXME */
if (list_empty(&urbp->ep_data->queue))
urb->start_frame = urbp->ep_data->next_frame;
else {
/* Go right after the last one */
struct urb *last_urb;
last_urb = list_entry(urbp->ep_data->queue.prev,
struct c67x00_urb_priv,
hep_node)->urb;
urb->start_frame =
frame_add(last_urb->start_frame,
last_urb->number_of_packets *
last_urb->interval);
}
urbp->cnt = 0;
break;
}
/* Add the URB to the endpoint queue */
list_add_tail(&urbp->hep_node, &urbp->ep_data->queue);
/* If this is the only URB, kick start the controller */
if (!c67x00->urb_count++)
c67x00_ll_hpi_enable_sofeop(c67x00->sie);
c67x00_sched_kick(c67x00);
spin_unlock_irqrestore(&c67x00->lock, flags);
return 0;
err_epdata:
usb_hcd_unlink_urb_from_ep(hcd, urb);
err_not_linked:
spin_unlock_irqrestore(&c67x00->lock, flags);
kfree(urbp);
err_urbp:
return ret;
}
int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
unsigned long flags;
int rc;
spin_lock_irqsave(&c67x00->lock, flags);
rc = usb_hcd_check_unlink_urb(hcd, urb, status);
if (rc)
goto done;
c67x00_release_urb(c67x00, urb);
usb_hcd_unlink_urb_from_ep(hcd, urb);
spin_unlock(&c67x00->lock);
usb_hcd_giveback_urb(hcd, urb, status);
spin_lock(&c67x00->lock);
spin_unlock_irqrestore(&c67x00->lock, flags);
return 0;
done:
spin_unlock_irqrestore(&c67x00->lock, flags);
return rc;
}
/* -------------------------------------------------------------------------- */
/*
* pre: c67x00 locked, urb unlocked
*/
static void
c67x00_giveback_urb(struct c67x00_hcd *c67x00, struct urb *urb, int status)
{
struct c67x00_urb_priv *urbp;
if (!urb)
return;
urbp = urb->hcpriv;
urbp->status = status;
list_del_init(&urbp->hep_node);
c67x00_release_urb(c67x00, urb);
usb_hcd_unlink_urb_from_ep(c67x00_hcd_to_hcd(c67x00), urb);
spin_unlock(&c67x00->lock);
usb_hcd_giveback_urb(c67x00_hcd_to_hcd(c67x00), urb, status);
spin_lock(&c67x00->lock);
}
/* -------------------------------------------------------------------------- */
static int c67x00_claim_frame_bw(struct c67x00_hcd *c67x00, struct urb *urb,
int len, int periodic)
{
struct c67x00_urb_priv *urbp = urb->hcpriv;
int bit_time;
/* According to the C67x00 BIOS user manual, page 3-18,19, the
* following calculations provide the full speed bit times for
* a transaction.
*
* FS(in) = 112.5 + 9.36*BC + HOST_DELAY
* FS(in,iso) = 90.5 + 9.36*BC + HOST_DELAY
* FS(out) = 112.5 + 9.36*BC + HOST_DELAY
* FS(out,iso) = 78.4 + 9.36*BC + HOST_DELAY
* LS(in) = 802.4 + 75.78*BC + HOST_DELAY
* LS(out) = 802.6 + 74.67*BC + HOST_DELAY
*
* HOST_DELAY == 106 for the c67200 and c67300.
*/
/* make calculations in 1/100 bit times to maintain resolution */
if (urbp->ep_data->dev->speed == USB_SPEED_LOW) {
/* Low speed pipe */
if (usb_pipein(urb->pipe))
bit_time = 80240 + 7578*len;
else
bit_time = 80260 + 7467*len;
} else {
/* FS pipes */
if (usb_pipeisoc(urb->pipe))
bit_time = usb_pipein(urb->pipe) ? 9050 : 7840;
else
bit_time = 11250;
bit_time += 936*len;
}
/* Scale back down to integer bit times. Use a host delay of 106.
* (this is the only place it is used) */
bit_time = ((bit_time+50) / 100) + 106;
if (unlikely(bit_time + c67x00->bandwidth_allocated >=
c67x00->max_frame_bw))
return -EMSGSIZE;
if (unlikely(c67x00->next_td_addr + CY_TD_SIZE >=
c67x00->td_base_addr + SIE_TD_SIZE))
return -EMSGSIZE;
if (unlikely(c67x00->next_buf_addr + len >=
c67x00->buf_base_addr + SIE_TD_BUF_SIZE))
return -EMSGSIZE;
if (periodic) {
if (unlikely(bit_time + c67x00->periodic_bw_allocated >=
MAX_PERIODIC_BW(c67x00->max_frame_bw)))
return -EMSGSIZE;
c67x00->periodic_bw_allocated += bit_time;
}
c67x00->bandwidth_allocated += bit_time;
return 0;
}
/* -------------------------------------------------------------------------- */
/*
* td_addr and buf_addr must be word aligned
*/
static int c67x00_create_td(struct c67x00_hcd *c67x00, struct urb *urb,
void *data, int len, int pid, int toggle,
unsigned long privdata)
{
struct c67x00_td *td;
struct c67x00_urb_priv *urbp = urb->hcpriv;
const __u8 active_flag = 1, retry_cnt = 3;
__u8 cmd = 0;
int tt = 0;
if (c67x00_claim_frame_bw(c67x00, urb, len, usb_pipeisoc(urb->pipe)
|| usb_pipeint(urb->pipe)))
return -EMSGSIZE; /* Not really an error, but expected */
td = kzalloc(sizeof(*td), GFP_ATOMIC);
if (!td)
return -ENOMEM;
td->pipe = urb->pipe;
td->ep_data = urbp->ep_data;
if ((td_udev(td)->speed == USB_SPEED_LOW) &&
!(c67x00->low_speed_ports & (1 << urbp->port)))
cmd |= PREAMBLE_EN;
switch (usb_pipetype(td->pipe)) {
case PIPE_ISOCHRONOUS:
tt = TT_ISOCHRONOUS;
cmd |= ISO_EN;
break;
case PIPE_CONTROL:
tt = TT_CONTROL;
break;
case PIPE_BULK:
tt = TT_BULK;
break;
case PIPE_INTERRUPT:
tt = TT_INTERRUPT;
break;
}
if (toggle)
cmd |= SEQ_SEL;
cmd |= ARM_EN;
/* SW part */
td->td_addr = c67x00->next_td_addr;
c67x00->next_td_addr = c67x00->next_td_addr + CY_TD_SIZE;
/* HW part */
td->ly_base_addr = __cpu_to_le16(c67x00->next_buf_addr);
td->port_length = __cpu_to_le16((c67x00->sie->sie_num << 15) |
(urbp->port << 14) | (len & 0x3FF));
td->pid_ep = ((pid & 0xF) << TD_PIDEP_OFFSET) |
(usb_pipeendpoint(td->pipe) & 0xF);
td->dev_addr = usb_pipedevice(td->pipe) & 0x7F;
td->ctrl_reg = cmd;
td->status = 0;
td->retry_cnt = (tt << TT_OFFSET) | (active_flag << 4) | retry_cnt;
td->residue = 0;
td->next_td_addr = __cpu_to_le16(c67x00->next_td_addr);
/* SW part */
td->data = data;
td->urb = urb;
td->privdata = privdata;
c67x00->next_buf_addr += (len + 1) & ~0x01; /* properly align */
list_add_tail(&td->td_list, &c67x00->td_list);
return 0;
}
static inline void c67x00_release_td(struct c67x00_td *td)
{
list_del_init(&td->td_list);
kfree(td);
}
/* -------------------------------------------------------------------------- */
static int c67x00_add_data_urb(struct c67x00_hcd *c67x00, struct urb *urb)
{
int remaining;
int toggle;
int pid;
int ret = 0;
int maxps;
int need_empty;
toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
usb_pipeout(urb->pipe));
remaining = urb->transfer_buffer_length - urb->actual_length;
maxps = usb_maxpacket(urb->dev, urb->pipe);
need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
usb_pipeout(urb->pipe) && !(remaining % maxps);
while (remaining || need_empty) {
int len;
char *td_buf;
len = (remaining > maxps) ? maxps : remaining;
if (!len)
need_empty = 0;
pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
td_buf = urb->transfer_buffer + urb->transfer_buffer_length -
remaining;
ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, toggle,
DATA_STAGE);
if (ret)
return ret; /* td wasn't created */
toggle ^= 1;
remaining -= len;
if (usb_pipecontrol(urb->pipe))
break;
}
return 0;
}
/*
* return 0 in case more bandwidth is available, else errorcode
*/
static int c67x00_add_ctrl_urb(struct c67x00_hcd *c67x00, struct urb *urb)
{
int ret;
int pid;
switch (urb->interval) {
default:
case SETUP_STAGE:
ret = c67x00_create_td(c67x00, urb, urb->setup_packet,
8, USB_PID_SETUP, 0, SETUP_STAGE);
if (ret)
return ret;
urb->interval = SETUP_STAGE;
usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
usb_pipeout(urb->pipe), 1);
break;
case DATA_STAGE:
if (urb->transfer_buffer_length) {
ret = c67x00_add_data_urb(c67x00, urb);
if (ret)
return ret;
break;
}
fallthrough;
case STATUS_STAGE:
pid = !usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
ret = c67x00_create_td(c67x00, urb, NULL, 0, pid, 1,
STATUS_STAGE);
if (ret)
return ret;
break;
}
return 0;
}
/*
* return 0 in case more bandwidth is available, else errorcode
*/
static int c67x00_add_int_urb(struct c67x00_hcd *c67x00, struct urb *urb)
{
struct c67x00_urb_priv *urbp = urb->hcpriv;
if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
urbp->ep_data->next_frame =
frame_add(urbp->ep_data->next_frame, urb->interval);
return c67x00_add_data_urb(c67x00, urb);
}
return 0;
}
static int c67x00_add_iso_urb(struct c67x00_hcd *c67x00, struct urb *urb)
{
struct c67x00_urb_priv *urbp = urb->hcpriv;
if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
char *td_buf;
int len, pid, ret;
BUG_ON(urbp->cnt >= urb->number_of_packets);
td_buf = urb->transfer_buffer +
urb->iso_frame_desc[urbp->cnt].offset;
len = urb->iso_frame_desc[urbp->cnt].length;
pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, 0,
urbp->cnt);
if (ret) {
dev_dbg(c67x00_hcd_dev(c67x00), "create failed: %d\n",
ret);
urb->iso_frame_desc[urbp->cnt].actual_length = 0;
urb->iso_frame_desc[urbp->cnt].status = ret;
if (urbp->cnt + 1 == urb->number_of_packets)
c67x00_giveback_urb(c67x00, urb, 0);
}
urbp->ep_data->next_frame =
frame_add(urbp->ep_data->next_frame, urb->interval);
urbp->cnt++;
}
return 0;
}
/* -------------------------------------------------------------------------- */
static void c67x00_fill_from_list(struct c67x00_hcd *c67x00, int type,
int (*add)(struct c67x00_hcd *, struct urb *))
{
struct c67x00_ep_data *ep_data;
struct urb *urb;
/* traverse every endpoint on the list */
list_for_each_entry(ep_data, &c67x00->list[type], node) {
if (!list_empty(&ep_data->queue)) {
/* and add the first urb */
/* isochronous transfer rely on this */
urb = list_entry(ep_data->queue.next,
struct c67x00_urb_priv,
hep_node)->urb;
add(c67x00, urb);
}
}
}
static void c67x00_fill_frame(struct c67x00_hcd *c67x00)
{
struct c67x00_td *td, *ttd;
/* Check if we can proceed */
if (!list_empty(&c67x00->td_list)) {
dev_warn(c67x00_hcd_dev(c67x00),
"TD list not empty! This should not happen!\n");
list_for_each_entry_safe(td, ttd, &c67x00->td_list, td_list) {
dbg_td(c67x00, td, "Unprocessed td");
c67x00_release_td(td);
}
}
/* Reinitialize variables */
c67x00->bandwidth_allocated = 0;
c67x00->periodic_bw_allocated = 0;
c67x00->next_td_addr = c67x00->td_base_addr;
c67x00->next_buf_addr = c67x00->buf_base_addr;
/* Fill the list */
c67x00_fill_from_list(c67x00, PIPE_ISOCHRONOUS, c67x00_add_iso_urb);
c67x00_fill_from_list(c67x00, PIPE_INTERRUPT, c67x00_add_int_urb);
c67x00_fill_from_list(c67x00, PIPE_CONTROL, c67x00_add_ctrl_urb);
c67x00_fill_from_list(c67x00, PIPE_BULK, c67x00_add_data_urb);
}
/* -------------------------------------------------------------------------- */
/*
* Get TD from C67X00
*/
static inline void
c67x00_parse_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
{
c67x00_ll_read_mem_le16(c67x00->sie->dev,
td->td_addr, td, CY_TD_SIZE);
if (usb_pipein(td->pipe) && td_actual_bytes(td))
c67x00_ll_read_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
td->data, td_actual_bytes(td));
}
static int c67x00_td_to_error(struct c67x00_hcd *c67x00, struct c67x00_td *td)
{
if (td->status & TD_STATUSMASK_ERR) {
dbg_td(c67x00, td, "ERROR_FLAG");
return -EILSEQ;
}
if (td->status & TD_STATUSMASK_STALL) {
/* dbg_td(c67x00, td, "STALL"); */
return -EPIPE;
}
if (td->status & TD_STATUSMASK_TMOUT) {
dbg_td(c67x00, td, "TIMEOUT");
return -ETIMEDOUT;
}
return 0;
}
static inline int c67x00_end_of_data(struct c67x00_td *td)
{
int maxps, need_empty, remaining;
struct urb *urb = td->urb;
int act_bytes;
act_bytes = td_actual_bytes(td);
if (unlikely(!act_bytes))
return 1; /* This was an empty packet */
maxps = usb_maxpacket(td_udev(td), td->pipe);
if (unlikely(act_bytes < maxps))
return 1; /* Smaller then full packet */
remaining = urb->transfer_buffer_length - urb->actual_length;
need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
usb_pipeout(urb->pipe) && !(remaining % maxps);
if (unlikely(!remaining && !need_empty))
return 1;
return 0;
}
/* -------------------------------------------------------------------------- */
/* Remove all td's from the list which come
* after last_td and are meant for the same pipe.
* This is used when a short packet has occurred */
static inline void c67x00_clear_pipe(struct c67x00_hcd *c67x00,
struct c67x00_td *last_td)
{
struct c67x00_td *td, *tmp;
td = last_td;
tmp = last_td;
while (td->td_list.next != &c67x00->td_list) {
td = list_entry(td->td_list.next, struct c67x00_td, td_list);
if (td->pipe == last_td->pipe) {
c67x00_release_td(td);
td = tmp;
}
tmp = td;
}
}
/* -------------------------------------------------------------------------- */
static void c67x00_handle_successful_td(struct c67x00_hcd *c67x00,
struct c67x00_td *td)
{
struct urb *urb = td->urb;
if (!urb)
return;
urb->actual_length += td_actual_bytes(td);
switch (usb_pipetype(td->pipe)) {
/* isochronous tds are handled separately */
case PIPE_CONTROL:
switch (td->privdata) {
case SETUP_STAGE:
urb->interval =
urb->transfer_buffer_length ?
DATA_STAGE : STATUS_STAGE;
/* Don't count setup_packet with normal data: */
urb->actual_length = 0;
break;
case DATA_STAGE:
if (c67x00_end_of_data(td)) {
urb->interval = STATUS_STAGE;
c67x00_clear_pipe(c67x00, td);
}
break;
case STATUS_STAGE:
urb->interval = 0;
c67x00_giveback_urb(c67x00, urb, 0);
break;
}
break;
case PIPE_INTERRUPT:
case PIPE_BULK:
if (unlikely(c67x00_end_of_data(td))) {
c67x00_clear_pipe(c67x00, td);
c67x00_giveback_urb(c67x00, urb, 0);
}
break;
}
}
static void c67x00_handle_isoc(struct c67x00_hcd *c67x00, struct c67x00_td *td)
{
struct urb *urb = td->urb;
int cnt;
if (!urb)
return;
cnt = td->privdata;
if (td->status & TD_ERROR_MASK)
urb->error_count++;
urb->iso_frame_desc[cnt].actual_length = td_actual_bytes(td);
urb->iso_frame_desc[cnt].status = c67x00_td_to_error(c67x00, td);
if (cnt + 1 == urb->number_of_packets) /* Last packet */
c67x00_giveback_urb(c67x00, urb, 0);
}
/* -------------------------------------------------------------------------- */
/*
* c67x00_check_td_list - handle tds which have been processed by the c67x00
* pre: current_td == 0
*/
static inline void c67x00_check_td_list(struct c67x00_hcd *c67x00)
{
struct c67x00_td *td, *tmp;
struct urb *urb;
int ack_ok;
int clear_endpoint;
list_for_each_entry_safe(td, tmp, &c67x00->td_list, td_list) {
/* get the TD */
c67x00_parse_td(c67x00, td);
urb = td->urb; /* urb can be NULL! */
ack_ok = 0;
clear_endpoint = 1;
/* Handle isochronous transfers separately */
if (usb_pipeisoc(td->pipe)) {
clear_endpoint = 0;
c67x00_handle_isoc(c67x00, td);
goto cont;
}
/* When an error occurs, all td's for that pipe go into an
* inactive state. This state matches successful transfers so
* we must make sure not to service them. */
if (td->status & TD_ERROR_MASK) {
c67x00_giveback_urb(c67x00, urb,
c67x00_td_to_error(c67x00, td));
goto cont;
}
if ((td->status & TD_STATUSMASK_NAK) || !td_sequence_ok(td) ||
!td_acked(td))
goto cont;
/* Sequence ok and acked, don't need to fix toggle */
ack_ok = 1;
if (unlikely(td->status & TD_STATUSMASK_OVF)) {
if (td_residue(td) & TD_RESIDUE_OVERFLOW) {
/* Overflow */
c67x00_giveback_urb(c67x00, urb, -EOVERFLOW);
goto cont;
}
}
clear_endpoint = 0;
c67x00_handle_successful_td(c67x00, td);
cont:
if (clear_endpoint)
c67x00_clear_pipe(c67x00, td);
if (ack_ok)
usb_settoggle(td_udev(td), usb_pipeendpoint(td->pipe),
usb_pipeout(td->pipe),
!(td->ctrl_reg & SEQ_SEL));
/* next in list could have been removed, due to clear_pipe! */
tmp = list_entry(td->td_list.next, typeof(*td), td_list);
c67x00_release_td(td);
}
}
/* -------------------------------------------------------------------------- */
static inline int c67x00_all_tds_processed(struct c67x00_hcd *c67x00)
{
/* If all tds are processed, we can check the previous frame (if
* there was any) and start our next frame.
*/
return !c67x00_ll_husb_get_current_td(c67x00->sie);
}
/*
* Send td to C67X00
*/
static void c67x00_send_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
{
int len = td_length(td);
if (len && ((td->pid_ep & TD_PIDEPMASK_PID) != TD_PID_IN))
c67x00_ll_write_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
td->data, len);
c67x00_ll_write_mem_le16(c67x00->sie->dev,
td->td_addr, td, CY_TD_SIZE);
}
static void c67x00_send_frame(struct c67x00_hcd *c67x00)
{
struct c67x00_td *td;
if (list_empty(&c67x00->td_list))
dev_warn(c67x00_hcd_dev(c67x00),
"%s: td list should not be empty here!\n",
__func__);
list_for_each_entry(td, &c67x00->td_list, td_list) {
if (td->td_list.next == &c67x00->td_list)
td->next_td_addr = 0; /* Last td in list */
c67x00_send_td(c67x00, td);
}
c67x00_ll_husb_set_current_td(c67x00->sie, c67x00->td_base_addr);
}
/* -------------------------------------------------------------------------- */
/*
* c67x00_do_work - Schedulers state machine
*/
static void c67x00_do_work(struct c67x00_hcd *c67x00)
{
spin_lock(&c67x00->lock);
/* Make sure all tds are processed */
if (!c67x00_all_tds_processed(c67x00))
goto out;
c67x00_check_td_list(c67x00);
/* no td's are being processed (current == 0)
* and all have been "checked" */
complete(&c67x00->endpoint_disable);
if (!list_empty(&c67x00->td_list))
goto out;
c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
if (c67x00->current_frame == c67x00->last_frame)
goto out; /* Don't send tds in same frame */
c67x00->last_frame = c67x00->current_frame;
/* If no urbs are scheduled, our work is done */
if (!c67x00->urb_count) {
c67x00_ll_hpi_disable_sofeop(c67x00->sie);
goto out;
}
c67x00_fill_frame(c67x00);
if (!list_empty(&c67x00->td_list))
/* TD's have been added to the frame */
c67x00_send_frame(c67x00);
out:
spin_unlock(&c67x00->lock);
}
/* -------------------------------------------------------------------------- */
static void c67x00_sched_work(struct work_struct *work)
{
struct c67x00_hcd *c67x00;
c67x00 = container_of(work, struct c67x00_hcd, work);
c67x00_do_work(c67x00);
}
void c67x00_sched_kick(struct c67x00_hcd *c67x00)
{
queue_work(system_highpri_wq, &c67x00->work);
}
int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00)
{
INIT_WORK(&c67x00->work, c67x00_sched_work);
return 0;
}
void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00)
{
cancel_work_sync(&c67x00->work);
}
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