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kernel-fxtec-pro1x/drivers/usb/host/fhci-tds.c
Stefani Seibold 4546548789 kfifo: move struct kfifo in place 
This is a new generic kernel FIFO implementation.

The current kernel fifo API is not very widely used, because it has to
many constrains.  Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.

I think this are the reasons why kfifo is not in use:

 - The API is to simple, important functions are missing
 - A fifo can be only allocated dynamically
 - There is a requirement of a spinlock whether you need it or not
 - There is no support for data records inside a fifo

So I decided to extend the kfifo in a more generic way without blowing up
the API to much.  The new API has the following benefits:

 - Generic usage: For kernel internal use and/or device driver.
 - Provide an API for the most use case.
 - Slim API: The whole API provides 25 functions.
 - Linux style habit.
 - DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
 - Direct copy_to_user from the fifo and copy_from_user into the fifo.
 - The kfifo itself is an in place member of the using data structure, this save an
   indirection access and does not waste the kernel allocator.
 - Lockless access: if only one reader and one writer is active on the fifo,
   which is the common use case, no additional locking is necessary.
 - Remove spinlock - give the user the freedom of choice what kind of locking to use if
   one is required.
 - Ability to handle records. Three type of records are supported:
   - Variable length records between 0-255 bytes, with a record size
     field of 1 bytes.
   - Variable length records between 0-65535 bytes, with a record size
     field of 2 bytes.
   - Fixed size records, which no record size field.
 - Preserve memory resource.
 - Performance!
 - Easy to use!

This patch:

Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure.  This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them.  This
patch changes the implementation and all existing users.

[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-22 14:17:55 -08:00

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/*
* Freescale QUICC Engine USB Host Controller Driver
*
* Copyright (c) Freescale Semicondutor, Inc. 2006.
* Shlomi Gridish <gridish@freescale.com>
* Jerry Huang <Chang-Ming.Huang@freescale.com>
* Copyright (c) Logic Product Development, Inc. 2007
* Peter Barada <peterb@logicpd.com>
* Copyright (c) MontaVista Software, Inc. 2008.
* Anton Vorontsov <avorontsov@ru.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.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/io.h>
#include <linux/usb.h>
#include "../core/hcd.h"
#include "fhci.h"
#define DUMMY_BD_BUFFER 0xdeadbeef
#define DUMMY2_BD_BUFFER 0xbaadf00d
/* Transaction Descriptors bits */
#define TD_R 0x8000 /* ready bit */
#define TD_W 0x2000 /* wrap bit */
#define TD_I 0x1000 /* interrupt on completion */
#define TD_L 0x0800 /* last */
#define TD_TC 0x0400 /* transmit CRC */
#define TD_CNF 0x0200 /* CNF - Must be always 1 */
#define TD_LSP 0x0100 /* Low-speed transaction */
#define TD_PID 0x00c0 /* packet id */
#define TD_RXER 0x0020 /* Rx error or not */
#define TD_NAK 0x0010 /* No ack. */
#define TD_STAL 0x0008 /* Stall recieved */
#define TD_TO 0x0004 /* time out */
#define TD_UN 0x0002 /* underrun */
#define TD_NO 0x0010 /* Rx Non Octet Aligned Packet */
#define TD_AB 0x0008 /* Frame Aborted */
#define TD_CR 0x0004 /* CRC Error */
#define TD_OV 0x0002 /* Overrun */
#define TD_BOV 0x0001 /* Buffer Overrun */
#define TD_ERRORS (TD_NAK | TD_STAL | TD_TO | TD_UN | \
TD_NO | TD_AB | TD_CR | TD_OV | TD_BOV)
#define TD_PID_DATA0 0x0080 /* Data 0 toggle */
#define TD_PID_DATA1 0x00c0 /* Data 1 toggle */
#define TD_PID_TOGGLE 0x00c0 /* Data 0/1 toggle mask */
#define TD_TOK_SETUP 0x0000
#define TD_TOK_OUT 0x4000
#define TD_TOK_IN 0x8000
#define TD_ISO 0x1000
#define TD_ENDP 0x0780
#define TD_ADDR 0x007f
#define TD_ENDP_SHIFT 7
struct usb_td {
__be16 status;
__be16 length;
__be32 buf_ptr;
__be16 extra;
__be16 reserved;
};
static struct usb_td __iomem *next_bd(struct usb_td __iomem *base,
struct usb_td __iomem *td,
u16 status)
{
if (status & TD_W)
return base;
else
return ++td;
}
void fhci_push_dummy_bd(struct endpoint *ep)
{
if (ep->already_pushed_dummy_bd == false) {
u16 td_status = in_be16(&ep->empty_td->status);
out_be32(&ep->empty_td->buf_ptr, DUMMY_BD_BUFFER);
/* get the next TD in the ring */
ep->empty_td = next_bd(ep->td_base, ep->empty_td, td_status);
ep->already_pushed_dummy_bd = true;
}
}
/* destroy an USB endpoint */
void fhci_ep0_free(struct fhci_usb *usb)
{
struct endpoint *ep;
int size;
ep = usb->ep0;
if (ep) {
if (ep->td_base)
cpm_muram_free(cpm_muram_offset(ep->td_base));
if (ep->conf_frame_Q) {
size = cq_howmany(&ep->conf_frame_Q);
for (; size; size--) {
struct packet *pkt = cq_get(&ep->conf_frame_Q);
kfree(pkt);
}
cq_delete(&ep->conf_frame_Q);
}
if (ep->empty_frame_Q) {
size = cq_howmany(&ep->empty_frame_Q);
for (; size; size--) {
struct packet *pkt = cq_get(&ep->empty_frame_Q);
kfree(pkt);
}
cq_delete(&ep->empty_frame_Q);
}
if (ep->dummy_packets_Q) {
size = cq_howmany(&ep->dummy_packets_Q);
for (; size; size--) {
u8 *buff = cq_get(&ep->dummy_packets_Q);
kfree(buff);
}
cq_delete(&ep->dummy_packets_Q);
}
kfree(ep);
usb->ep0 = NULL;
}
}
/*
* create the endpoint structure
*
* arguments:
* usb A pointer to the data structure of the USB
* data_mem The data memory partition(BUS)
* ring_len TD ring length
*/
u32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
u32 ring_len)
{
struct endpoint *ep;
struct usb_td __iomem *td;
unsigned long ep_offset;
char *err_for = "enpoint PRAM";
int ep_mem_size;
u32 i;
/* we need at least 3 TDs in the ring */
if (!(ring_len > 2)) {
fhci_err(usb->fhci, "illegal TD ring length parameters\n");
return -EINVAL;
}
ep = kzalloc(sizeof(*ep), GFP_KERNEL);
if (!ep)
return -ENOMEM;
ep_mem_size = ring_len * sizeof(*td) + sizeof(struct fhci_ep_pram);
ep_offset = cpm_muram_alloc(ep_mem_size, 32);
if (IS_ERR_VALUE(ep_offset))
goto err;
ep->td_base = cpm_muram_addr(ep_offset);
/* zero all queue pointers */
if (cq_new(&ep->conf_frame_Q, ring_len + 2) ||
cq_new(&ep->empty_frame_Q, ring_len + 2) ||
cq_new(&ep->dummy_packets_Q, ring_len + 2)) {
err_for = "frame_queues";
goto err;
}
for (i = 0; i < (ring_len + 1); i++) {
struct packet *pkt;
u8 *buff;
pkt = kmalloc(sizeof(*pkt), GFP_KERNEL);
if (!pkt) {
err_for = "frame";
goto err;
}
buff = kmalloc(1028 * sizeof(*buff), GFP_KERNEL);
if (!buff) {
kfree(pkt);
err_for = "buffer";
goto err;
}
cq_put(&ep->empty_frame_Q, pkt);
cq_put(&ep->dummy_packets_Q, buff);
}
/* we put the endpoint parameter RAM right behind the TD ring */
ep->ep_pram_ptr = (void __iomem *)ep->td_base + sizeof(*td) * ring_len;
ep->conf_td = ep->td_base;
ep->empty_td = ep->td_base;
ep->already_pushed_dummy_bd = false;
/* initialize tds */
td = ep->td_base;
for (i = 0; i < ring_len; i++) {
out_be32(&td->buf_ptr, 0);
out_be16(&td->status, 0);
out_be16(&td->length, 0);
out_be16(&td->extra, 0);
td++;
}
td--;
out_be16(&td->status, TD_W); /* for last TD set Wrap bit */
out_be16(&td->length, 0);
/* endpoint structure has been created */
usb->ep0 = ep;
return 0;
err:
fhci_ep0_free(usb);
kfree(ep);
fhci_err(usb->fhci, "no memory for the %s\n", err_for);
return -ENOMEM;
}
/*
* initialize the endpoint register according to the given parameters
*
* artuments:
* usb A pointer to the data strucutre of the USB
* ep A pointer to the endpoint structre
* data_mem The data memory partition(BUS)
*/
void fhci_init_ep_registers(struct fhci_usb *usb, struct endpoint *ep,
enum fhci_mem_alloc data_mem)
{
u8 rt;
/* set the endpoint registers according to the endpoint */
out_be16(&usb->fhci->regs->usb_ep[0],
USB_TRANS_CTR | USB_EP_MF | USB_EP_RTE);
out_be16(&usb->fhci->pram->ep_ptr[0],
cpm_muram_offset(ep->ep_pram_ptr));
rt = (BUS_MODE_BO_BE | BUS_MODE_GBL);
#ifdef MULTI_DATA_BUS
if (data_mem == MEM_SECONDARY)
rt |= BUS_MODE_DTB;
#endif
out_8(&ep->ep_pram_ptr->rx_func_code, rt);
out_8(&ep->ep_pram_ptr->tx_func_code, rt);
out_be16(&ep->ep_pram_ptr->rx_buff_len, 1028);
out_be16(&ep->ep_pram_ptr->rx_base, 0);
out_be16(&ep->ep_pram_ptr->tx_base, cpm_muram_offset(ep->td_base));
out_be16(&ep->ep_pram_ptr->rx_bd_ptr, 0);
out_be16(&ep->ep_pram_ptr->tx_bd_ptr, cpm_muram_offset(ep->td_base));
out_be32(&ep->ep_pram_ptr->tx_state, 0);
}
/*
* Collect the submitted frames and inform the application about them
* It is also prepearing the TDs for new frames. If the Tx interrupts
* are diabled, the application should call that routine to get
* confirmation about the submitted frames. Otherwise, the routine is
* called frome the interrupt service routine during the Tx interrupt.
* In that case the application is informed by calling the application
* specific 'fhci_transaction_confirm' routine
*/
static void fhci_td_transaction_confirm(struct fhci_usb *usb)
{
struct endpoint *ep = usb->ep0;
struct packet *pkt;
struct usb_td __iomem *td;
u16 extra_data;
u16 td_status;
u16 td_length;
u32 buf;
/*
* collect transmitted BDs from the chip. The routine clears all BDs
* with R bit = 0 and the pointer to data buffer is not NULL, that is
* BDs which point to the transmitted data buffer
*/
while (1) {
td = ep->conf_td;
td_status = in_be16(&td->status);
td_length = in_be16(&td->length);
buf = in_be32(&td->buf_ptr);
extra_data = in_be16(&td->extra);
/* check if the TD is empty */
if (!(!(td_status & TD_R) && ((td_status & ~TD_W) || buf)))
break;
/* check if it is a dummy buffer */
else if ((buf == DUMMY_BD_BUFFER) && !(td_status & ~TD_W))
break;
/* mark TD as empty */
clrbits16(&td->status, ~TD_W);
out_be16(&td->length, 0);
out_be32(&td->buf_ptr, 0);
out_be16(&td->extra, 0);
/* advance the TD pointer */
ep->conf_td = next_bd(ep->td_base, ep->conf_td, td_status);
/* check if it is a dummy buffer(type2) */
if ((buf == DUMMY2_BD_BUFFER) && !(td_status & ~TD_W))
continue;
pkt = cq_get(&ep->conf_frame_Q);
if (!pkt)
fhci_err(usb->fhci, "no frame to confirm\n");
if (td_status & TD_ERRORS) {
if (td_status & TD_RXER) {
if (td_status & TD_CR)
pkt->status = USB_TD_RX_ER_CRC;
else if (td_status & TD_AB)
pkt->status = USB_TD_RX_ER_BITSTUFF;
else if (td_status & TD_OV)
pkt->status = USB_TD_RX_ER_OVERUN;
else if (td_status & TD_BOV)
pkt->status = USB_TD_RX_DATA_OVERUN;
else if (td_status & TD_NO)
pkt->status = USB_TD_RX_ER_NONOCT;
else
fhci_err(usb->fhci, "illegal error "
"occured\n");
} else if (td_status & TD_NAK)
pkt->status = USB_TD_TX_ER_NAK;
else if (td_status & TD_TO)
pkt->status = USB_TD_TX_ER_TIMEOUT;
else if (td_status & TD_UN)
pkt->status = USB_TD_TX_ER_UNDERUN;
else if (td_status & TD_STAL)
pkt->status = USB_TD_TX_ER_STALL;
else
fhci_err(usb->fhci, "illegal error occured\n");
} else if ((extra_data & TD_TOK_IN) &&
pkt->len > td_length - CRC_SIZE) {
pkt->status = USB_TD_RX_DATA_UNDERUN;
}
if (extra_data & TD_TOK_IN)
pkt->len = td_length - CRC_SIZE;
else if (pkt->info & PKT_ZLP)
pkt->len = 0;
else
pkt->len = td_length;
fhci_transaction_confirm(usb, pkt);
}
}
/*
* Submitting a data frame to a specified endpoint of a USB device
* The frame is put in the driver's transmit queue for this endpoint
*
* Arguments:
* usb A pointer to the USB structure
* pkt A pointer to the user frame structure
* trans_type Transaction tyep - IN,OUT or SETUP
* dest_addr Device address - 0~127
* dest_ep Endpoint number of the device - 0~16
* trans_mode Pipe type - ISO,Interrupt,bulk or control
* dest_speed USB speed - Low speed or FULL speed
* data_toggle Data sequence toggle - 0 or 1
*/
u32 fhci_host_transaction(struct fhci_usb *usb,
struct packet *pkt,
enum fhci_ta_type trans_type,
u8 dest_addr,
u8 dest_ep,
enum fhci_tf_mode trans_mode,
enum fhci_speed dest_speed, u8 data_toggle)
{
struct endpoint *ep = usb->ep0;
struct usb_td __iomem *td;
u16 extra_data;
u16 td_status;
fhci_usb_disable_interrupt(usb);
/* start from the next BD that should be filled */
td = ep->empty_td;
td_status = in_be16(&td->status);
if (td_status & TD_R && in_be16(&td->length)) {
/* if the TD is not free */
fhci_usb_enable_interrupt(usb);
return -1;
}
/* get the next TD in the ring */
ep->empty_td = next_bd(ep->td_base, ep->empty_td, td_status);
fhci_usb_enable_interrupt(usb);
pkt->priv_data = td;
out_be32(&td->buf_ptr, virt_to_phys(pkt->data));
/* sets up transaction parameters - addr,endp,dir,and type */
extra_data = (dest_ep << TD_ENDP_SHIFT) | dest_addr;
switch (trans_type) {
case FHCI_TA_IN:
extra_data |= TD_TOK_IN;
break;
case FHCI_TA_OUT:
extra_data |= TD_TOK_OUT;
break;
case FHCI_TA_SETUP:
extra_data |= TD_TOK_SETUP;
break;
}
if (trans_mode == FHCI_TF_ISO)
extra_data |= TD_ISO;
out_be16(&td->extra, extra_data);
/* sets up the buffer descriptor */
td_status = ((td_status & TD_W) | TD_R | TD_L | TD_I | TD_CNF);
if (!(pkt->info & PKT_NO_CRC))
td_status |= TD_TC;
switch (trans_type) {
case FHCI_TA_IN:
if (data_toggle)
pkt->info |= PKT_PID_DATA1;
else
pkt->info |= PKT_PID_DATA0;
break;
default:
if (data_toggle) {
td_status |= TD_PID_DATA1;
pkt->info |= PKT_PID_DATA1;
} else {
td_status |= TD_PID_DATA0;
pkt->info |= PKT_PID_DATA0;
}
break;
}
if ((dest_speed == FHCI_LOW_SPEED) &&
(usb->port_status == FHCI_PORT_FULL))
td_status |= TD_LSP;
out_be16(&td->status, td_status);
/* set up buffer length */
if (trans_type == FHCI_TA_IN)
out_be16(&td->length, pkt->len + CRC_SIZE);
else
out_be16(&td->length, pkt->len);
/* put the frame to the confirmation queue */
cq_put(&ep->conf_frame_Q, pkt);
if (cq_howmany(&ep->conf_frame_Q) == 1)
out_8(&usb->fhci->regs->usb_comm, USB_CMD_STR_FIFO);
return 0;
}
/* Reset the Tx BD ring */
void fhci_flush_bds(struct fhci_usb *usb)
{
u16 extra_data;
u16 td_status;
u32 buf;
struct usb_td __iomem *td;
struct endpoint *ep = usb->ep0;
td = ep->td_base;
while (1) {
td_status = in_be16(&td->status);
buf = in_be32(&td->buf_ptr);
extra_data = in_be16(&td->extra);
/* if the TD is not empty - we'll confirm it as Timeout */
if (td_status & TD_R)
out_be16(&td->status, (td_status & ~TD_R) | TD_TO);
/* if this TD is dummy - let's skip this TD */
else if (in_be32(&td->buf_ptr) == DUMMY_BD_BUFFER)
out_be32(&td->buf_ptr, DUMMY2_BD_BUFFER);
/* if this is the last TD - break */
if (td_status & TD_W)
break;
td++;
}
fhci_td_transaction_confirm(usb);
td = ep->td_base;
do {
out_be16(&td->status, 0);
out_be16(&td->length, 0);
out_be32(&td->buf_ptr, 0);
out_be16(&td->extra, 0);
td++;
} while (!(in_be16(&td->status) & TD_W));
out_be16(&td->status, TD_W); /* for last TD set Wrap bit */
out_be16(&td->length, 0);
out_be32(&td->buf_ptr, 0);
out_be16(&td->extra, 0);
out_be16(&ep->ep_pram_ptr->tx_bd_ptr,
in_be16(&ep->ep_pram_ptr->tx_base));
out_be32(&ep->ep_pram_ptr->tx_state, 0);
out_be16(&ep->ep_pram_ptr->tx_cnt, 0);
ep->empty_td = ep->td_base;
ep->conf_td = ep->td_base;
}
/*
* Flush all transmitted packets from TDs in the actual frame.
* This routine is called when something wrong with the controller and
* we want to get rid of the actual frame and start again next frame
*/
void fhci_flush_actual_frame(struct fhci_usb *usb)
{
u8 mode;
u16 tb_ptr;
u16 extra_data;
u16 td_status;
u32 buf_ptr;
struct usb_td __iomem *td;
struct endpoint *ep = usb->ep0;
/* disable the USB controller */
mode = in_8(&usb->fhci->regs->usb_mod);
out_8(&usb->fhci->regs->usb_mod, mode & ~USB_MODE_EN);
tb_ptr = in_be16(&ep->ep_pram_ptr->tx_bd_ptr);
td = cpm_muram_addr(tb_ptr);
td_status = in_be16(&td->status);
buf_ptr = in_be32(&td->buf_ptr);
extra_data = in_be16(&td->extra);
do {
if (td_status & TD_R) {
out_be16(&td->status, (td_status & ~TD_R) | TD_TO);
} else {
out_be32(&td->buf_ptr, 0);
ep->already_pushed_dummy_bd = false;
break;
}
/* advance the TD pointer */
td = next_bd(ep->td_base, td, td_status);
td_status = in_be16(&td->status);
buf_ptr = in_be32(&td->buf_ptr);
extra_data = in_be16(&td->extra);
} while ((td_status & TD_R) || buf_ptr);
fhci_td_transaction_confirm(usb);
out_be16(&ep->ep_pram_ptr->tx_bd_ptr,
in_be16(&ep->ep_pram_ptr->tx_base));
out_be32(&ep->ep_pram_ptr->tx_state, 0);
out_be16(&ep->ep_pram_ptr->tx_cnt, 0);
ep->empty_td = ep->td_base;
ep->conf_td = ep->td_base;
usb->actual_frame->frame_status = FRAME_TIMER_END_TRANSMISSION;
/* reset the event register */
out_be16(&usb->fhci->regs->usb_event, 0xffff);
/* enable the USB controller */
out_8(&usb->fhci->regs->usb_mod, mode | USB_MODE_EN);
}
/* handles Tx confirm and Tx error interrupt */
void fhci_tx_conf_interrupt(struct fhci_usb *usb)
{
fhci_td_transaction_confirm(usb);
/*
* Schedule another transaction to this frame only if we have
* already confirmed all transaction in the frame.
*/
if (((fhci_get_sof_timer_count(usb) < usb->max_frame_usage) ||
(usb->actual_frame->frame_status & FRAME_END_TRANSMISSION)) &&
(list_empty(&usb->actual_frame->tds_list)))
fhci_schedule_transactions(usb);
}
void fhci_host_transmit_actual_frame(struct fhci_usb *usb)
{
u16 tb_ptr;
u16 td_status;
struct usb_td __iomem *td;
struct endpoint *ep = usb->ep0;
tb_ptr = in_be16(&ep->ep_pram_ptr->tx_bd_ptr);
td = cpm_muram_addr(tb_ptr);
if (in_be32(&td->buf_ptr) == DUMMY_BD_BUFFER) {
struct usb_td __iomem *old_td = td;
ep->already_pushed_dummy_bd = false;
td_status = in_be16(&td->status);
/* gets the next TD in the ring */
td = next_bd(ep->td_base, td, td_status);
tb_ptr = cpm_muram_offset(td);
out_be16(&ep->ep_pram_ptr->tx_bd_ptr, tb_ptr);
/* start transmit only if we have something in the TDs */
if (in_be16(&td->status) & TD_R)
out_8(&usb->fhci->regs->usb_comm, USB_CMD_STR_FIFO);
if (in_be32(&ep->conf_td->buf_ptr) == DUMMY_BD_BUFFER) {
out_be32(&old_td->buf_ptr, 0);
ep->conf_td = next_bd(ep->td_base, ep->conf_td,
td_status);
} else {
out_be32(&old_td->buf_ptr, DUMMY2_BD_BUFFER);
}
}
}
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