- 根目录:
- drivers
- media
- video
- omap24xxcam-dma.c
/*
* drivers/media/video/omap24xxcam-dma.c
*
* Copyright (C) 2004 MontaVista Software, Inc.
* Copyright (C) 2004 Texas Instruments.
* Copyright (C) 2007 Nokia Corporation.
*
* Contact: Sakari Ailus <sakari.ailus@nokia.com>
*
* Based on code from Andy Lowe <source@mvista.com> and
* David Cohen <david.cohen@indt.org.br>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/scatterlist.h>
#include "omap24xxcam.h"
/*
*
* DMA hardware.
*
*/
/* Ack all interrupt on CSR and IRQSTATUS_L0 */
static void omap24xxcam_dmahw_ack_all(unsigned long base)
{
u32 csr;
int i;
for (i = 0; i < NUM_CAMDMA_CHANNELS; ++i) {
csr = omap24xxcam_reg_in(base, CAMDMA_CSR(i));
/* ack interrupt in CSR */
omap24xxcam_reg_out(base, CAMDMA_CSR(i), csr);
}
omap24xxcam_reg_out(base, CAMDMA_IRQSTATUS_L0, 0xf);
}
/* Ack dmach on CSR and IRQSTATUS_L0 */
static u32 omap24xxcam_dmahw_ack_ch(unsigned long base, int dmach)
{
u32 csr;
csr = omap24xxcam_reg_in(base, CAMDMA_CSR(dmach));
/* ack interrupt in CSR */
omap24xxcam_reg_out(base, CAMDMA_CSR(dmach), csr);
/* ack interrupt in IRQSTATUS */
omap24xxcam_reg_out(base, CAMDMA_IRQSTATUS_L0, (1 << dmach));
return csr;
}
static int omap24xxcam_dmahw_running(unsigned long base, int dmach)
{
return omap24xxcam_reg_in(base, CAMDMA_CCR(dmach)) & CAMDMA_CCR_ENABLE;
}
static void omap24xxcam_dmahw_transfer_setup(unsigned long base, int dmach,
dma_addr_t start, u32 len)
{
omap24xxcam_reg_out(base, CAMDMA_CCR(dmach),
CAMDMA_CCR_SEL_SRC_DST_SYNC
| CAMDMA_CCR_BS
| CAMDMA_CCR_DST_AMODE_POST_INC
| CAMDMA_CCR_SRC_AMODE_POST_INC
| CAMDMA_CCR_FS
| CAMDMA_CCR_WR_ACTIVE
| CAMDMA_CCR_RD_ACTIVE
| CAMDMA_CCR_SYNCHRO_CAMERA);
omap24xxcam_reg_out(base, CAMDMA_CLNK_CTRL(dmach), 0);
omap24xxcam_reg_out(base, CAMDMA_CEN(dmach), len);
omap24xxcam_reg_out(base, CAMDMA_CFN(dmach), 1);
omap24xxcam_reg_out(base, CAMDMA_CSDP(dmach),
CAMDMA_CSDP_WRITE_MODE_POSTED
| CAMDMA_CSDP_DST_BURST_EN_32
| CAMDMA_CSDP_DST_PACKED
| CAMDMA_CSDP_SRC_BURST_EN_32
| CAMDMA_CSDP_SRC_PACKED
| CAMDMA_CSDP_DATA_TYPE_8BITS);
omap24xxcam_reg_out(base, CAMDMA_CSSA(dmach), 0);
omap24xxcam_reg_out(base, CAMDMA_CDSA(dmach), start);
omap24xxcam_reg_out(base, CAMDMA_CSEI(dmach), 0);
omap24xxcam_reg_out(base, CAMDMA_CSFI(dmach), DMA_THRESHOLD);
omap24xxcam_reg_out(base, CAMDMA_CDEI(dmach), 0);
omap24xxcam_reg_out(base, CAMDMA_CDFI(dmach), 0);
omap24xxcam_reg_out(base, CAMDMA_CSR(dmach),
CAMDMA_CSR_MISALIGNED_ERR
| CAMDMA_CSR_SECURE_ERR
| CAMDMA_CSR_TRANS_ERR
| CAMDMA_CSR_BLOCK
| CAMDMA_CSR_DROP);
omap24xxcam_reg_out(base, CAMDMA_CICR(dmach),
CAMDMA_CICR_MISALIGNED_ERR_IE
| CAMDMA_CICR_SECURE_ERR_IE
| CAMDMA_CICR_TRANS_ERR_IE
| CAMDMA_CICR_BLOCK_IE
| CAMDMA_CICR_DROP_IE);
}
static void omap24xxcam_dmahw_transfer_start(unsigned long base, int dmach)
{
omap24xxcam_reg_out(base, CAMDMA_CCR(dmach),
CAMDMA_CCR_SEL_SRC_DST_SYNC
| CAMDMA_CCR_BS
| CAMDMA_CCR_DST_AMODE_POST_INC
| CAMDMA_CCR_SRC_AMODE_POST_INC
| CAMDMA_CCR_ENABLE
| CAMDMA_CCR_FS
| CAMDMA_CCR_SYNCHRO_CAMERA);
}
static void omap24xxcam_dmahw_transfer_chain(unsigned long base, int dmach,
int free_dmach)
{
int prev_dmach, ch;
if (dmach == 0)
prev_dmach = NUM_CAMDMA_CHANNELS - 1;
else
prev_dmach = dmach - 1;
omap24xxcam_reg_out(base, CAMDMA_CLNK_CTRL(prev_dmach),
CAMDMA_CLNK_CTRL_ENABLE_LNK | dmach);
/* Did we chain the DMA transfer before the previous one
* finished?
*/
ch = (dmach + free_dmach) % NUM_CAMDMA_CHANNELS;
while (!(omap24xxcam_reg_in(base, CAMDMA_CCR(ch))
& CAMDMA_CCR_ENABLE)) {
if (ch == dmach) {
/* The previous transfer has ended and this one
* hasn't started, so we must not have chained
* to the previous one in time. We'll have to
* start it now.
*/
omap24xxcam_dmahw_transfer_start(base, dmach);
break;
} else
ch = (ch + 1) % NUM_CAMDMA_CHANNELS;
}
}
/* Abort all chained DMA transfers. After all transfers have been
* aborted and the DMA controller is idle, the completion routines for
* any aborted transfers will be called in sequence. The DMA
* controller may not be idle after this routine completes, because
* the completion routines might start new transfers.
*/
static void omap24xxcam_dmahw_abort_ch(unsigned long base, int dmach)
{
/* mask all interrupts from this channel */
omap24xxcam_reg_out(base, CAMDMA_CICR(dmach), 0);
/* unlink this channel */
omap24xxcam_reg_merge(base, CAMDMA_CLNK_CTRL(dmach), 0,
CAMDMA_CLNK_CTRL_ENABLE_LNK);
/* disable this channel */
omap24xxcam_reg_merge(base, CAMDMA_CCR(dmach), 0, CAMDMA_CCR_ENABLE);
}
static void omap24xxcam_dmahw_init(unsigned long base)
{
omap24xxcam_reg_out(base, CAMDMA_OCP_SYSCONFIG,
CAMDMA_OCP_SYSCONFIG_MIDLEMODE_FSTANDBY
| CAMDMA_OCP_SYSCONFIG_SIDLEMODE_FIDLE
| CAMDMA_OCP_SYSCONFIG_AUTOIDLE);
omap24xxcam_reg_merge(base, CAMDMA_GCR, 0x10,
CAMDMA_GCR_MAX_CHANNEL_FIFO_DEPTH);
omap24xxcam_reg_out(base, CAMDMA_IRQENABLE_L0, 0xf);
}
/*
*
* Individual DMA channel handling.
*
*/
/* Start a DMA transfer from the camera to memory.
* Returns zero if the transfer was successfully started, or non-zero if all
* DMA channels are already in use or starting is currently inhibited.
*/
static int omap24xxcam_dma_start(struct omap24xxcam_dma *dma, dma_addr_t start,
u32 len, dma_callback_t callback, void *arg)
{
unsigned long flags;
int dmach;
spin_lock_irqsave(&dma->lock, flags);
if (!dma->free_dmach || atomic_read(&dma->dma_stop)) {
spin_unlock_irqrestore(&dma->lock, flags);
return -EBUSY;
}
dmach = dma->next_dmach;
dma->ch_state[dmach].callback = callback;
dma->ch_state[dmach].arg = arg;
omap24xxcam_dmahw_transfer_setup(dma->base, dmach, start, len);
/* We're ready to start the DMA transfer. */
if (dma->free_dmach < NUM_CAMDMA_CHANNELS) {
/* A transfer is already in progress, so try to chain to it. */
omap24xxcam_dmahw_transfer_chain(dma->base, dmach,
dma->free_dmach);
} else {
/* No transfer is in progress, so we'll just start this one
* now.
*/
omap24xxcam_dmahw_transfer_start(dma->base, dmach);
}
dma->next_dmach = (dma->next_dmach + 1) % NUM_CAMDMA_CHANNELS;
dma->free_dmach--;
spin_unlock_irqrestore(&dma->lock, flags);
return 0;
}
/* Abort all chained DMA transfers. After all transfers have been
* aborted and the DMA controller is idle, the completion routines for
* any aborted transfers will be called in sequence. The DMA
* controller may not be idle after this routine completes, because
* the completion routines might start new transfers.
*/
static void omap24xxcam_dma_abort(struct omap24xxcam_dma *dma, u32 csr)
{
unsigned long flags;
int dmach, i, free_dmach;
dma_callback_t callback;
void *arg;
spin_lock_irqsave(&dma->lock, flags);
/* stop any DMA transfers in progress */
dmach = (dma->next_dmach + dma->free_dmach) % NUM_CAMDMA_CHANNELS;
for (i = 0; i < NUM_CAMDMA_CHANNELS; i++) {
omap24xxcam_dmahw_abort_ch(dma->base, dmach);
dmach = (dmach + 1) % NUM_CAMDMA_CHANNELS;
}
/* We have to be careful here because the callback routine
* might start a new DMA transfer, and we only want to abort
* transfers that were started before this routine was called.
*/
free_dmach = dma->free_dmach;
while ((dma->free_dmach < NUM_CAMDMA_CHANNELS) &&
(free_dmach < NUM_CAMDMA_CHANNELS)) {
dmach = (dma->next_dmach + dma->free_dmach)
% NUM_CAMDMA_CHANNELS;
callback = dma->ch_state[dmach].callback;
arg = dma->ch_state[dmach].arg;
dma->free_dmach++;
free_dmach++;
if (callback) {
/* leave interrupts disabled during callback */
spin_unlock(&dma->lock);
(*callback) (dma, csr, arg);
spin_lock(&dma->lock);
}
}
spin_unlock_irqrestore(&dma->lock, flags);
}
/* Abort all chained DMA transfers. After all transfers have been
* aborted and the DMA controller is idle, the completion routines for
* any aborted transfers will be called in sequence. If the completion
* routines attempt to start a new DMA transfer it will fail, so the
* DMA controller will be idle after this routine completes.
*/
static void omap24xxcam_dma_stop(struct omap24xxcam_dma *dma, u32 csr)
{
atomic_inc(&dma->dma_stop);
omap24xxcam_dma_abort(dma, csr);
atomic_dec(&dma->dma_stop);
}
/* Camera DMA interrupt service routine. */
void omap24xxcam_dma_isr(struct omap24xxcam_dma *dma)
{
int dmach;
dma_callback_t callback;
void *arg;
u32 csr;
const u32 csr_error = CAMDMA_CSR_MISALIGNED_ERR
| CAMDMA_CSR_SUPERVISOR_ERR | CAMDMA_CSR_SECURE_ERR
| CAMDMA_CSR_TRANS_ERR | CAMDMA_CSR_DROP;
spin_lock(&dma->lock);
if (dma->free_dmach == NUM_CAMDMA_CHANNELS) {
/* A camera DMA interrupt occurred while all channels
* are idle, so we'll acknowledge the interrupt in the
* IRQSTATUS register and exit.
*/
omap24xxcam_dmahw_ack_all(dma->base);
spin_unlock(&dma->lock);
return;
}
while (dma->free_dmach < NUM_CAMDMA_CHANNELS) {
dmach = (dma->next_dmach + dma->free_dmach)
% NUM_CAMDMA_CHANNELS;
if (omap24xxcam_dmahw_running(dma->base, dmach)) {
/* This buffer hasn't finished yet, so we're done. */
break;
}
csr = omap24xxcam_dmahw_ack_ch(dma->base, dmach);
if (csr & csr_error) {
/* A DMA error occurred, so stop all DMA
* transfers in progress.
*/
spin_unlock(&dma->lock);
omap24xxcam_dma_stop(dma, csr);
return;
} else {
callback = dma->ch_state[dmach].callback;
arg = dma->ch_state[dmach].arg;
dma->free_dmach++;
if (callback) {
spin_unlock(&dma->lock);
(*callback) (dma, csr, arg);
spin_lock(&dma->lock);
}
}
}
spin_unlock(&dma->lock);
omap24xxcam_sgdma_process(
container_of(dma, struct omap24xxcam_sgdma, dma));
}
void omap24xxcam_dma_hwinit(struct omap24xxcam_dma *dma)
{
unsigned long flags;
spin_lock_irqsave(&dma->lock, flags);
omap24xxcam_dmahw_init(dma->base);
spin_unlock_irqrestore(&dma->lock, flags);
}
static void omap24xxcam_dma_init(struct omap24xxcam_dma *dma,
unsigned long base)
{
int ch;
/* group all channels on DMA IRQ0 and unmask irq */
spin_lock_init(&dma->lock);
dma->base = base;
dma->free_dmach = NUM_CAMDMA_CHANNELS;
dma->next_dmach = 0;
for (ch = 0; ch < NUM_CAMDMA_CHANNELS; ch++) {
dma->ch_state[ch].callback = NULL;
dma->ch_state[ch].arg = NULL;
}
}
/*
*
* Scatter-gather DMA.
*
* High-level DMA construct for transferring whole picture frames to
* memory that is discontinuous.
*
*/
/* DMA completion routine for the scatter-gather DMA fragments. */
static void omap24xxcam_sgdma_callback(struct omap24xxcam_dma *dma, u32 csr,
void *arg)
{
struct omap24xxcam_sgdma *sgdma =
container_of(dma, struct omap24xxcam_sgdma, dma);
int sgslot = (int)arg;
struct sgdma_state *sg_state;
const u32 csr_error = CAMDMA_CSR_MISALIGNED_ERR
| CAMDMA_CSR_SUPERVISOR_ERR | CAMDMA_CSR_SECURE_ERR
| CAMDMA_CSR_TRANS_ERR | CAMDMA_CSR_DROP;
spin_lock(&sgdma->lock);
/* We got an interrupt, we can remove the timer */
del_timer(&sgdma->reset_timer);
sg_state = sgdma->sg_state + sgslot;
if (!sg_state->queued_sglist) {
spin_unlock(&sgdma->lock);
printk(KERN_ERR "%s: sgdma completed when none queued!\n",
__func__);
return;
}
sg_state->csr |= csr;
if (!--sg_state->queued_sglist) {
/* Queue for this sglist is empty, so check to see if we're
* done.
*/
if ((sg_state->next_sglist == sg_state->sglen)
|| (sg_state->csr & csr_error)) {
sgdma_callback_t callback = sg_state->callback;
void *arg = sg_state->arg;
u32 sg_csr = sg_state->csr;
/* All done with this sglist */
sgdma->free_sgdma++;
if (callback) {
spin_unlock(&sgdma->lock);
(*callback) (sgdma, sg_csr, arg);
return;
}
}
}
spin_unlock(&sgdma->lock);
}
/* Start queued scatter-gather DMA transfers. */
void omap24xxcam_sgdma_process(struct omap24xxcam_sgdma *sgdma)
{
unsigned long flags;
int queued_sgdma, sgslot;
struct sgdma_state *sg_state;
const u32 csr_error = CAMDMA_CSR_MISALIGNED_ERR
| CAMDMA_CSR_SUPERVISOR_ERR | CAMDMA_CSR_SECURE_ERR
| CAMDMA_CSR_TRANS_ERR | CAMDMA_CSR_DROP;
spin_lock_irqsave(&sgdma->lock, flags);
queued_sgdma = NUM_SG_DMA - sgdma->free_sgdma;
sgslot = (sgdma->next_sgdma + sgdma->free_sgdma) % NUM_SG_DMA;
while (queued_sgdma > 0) {
sg_state = sgdma->sg_state + sgslot;
while ((sg_state->next_sglist < sg_state->sglen) &&
!(sg_state->csr & csr_error)) {
const struct scatterlist *sglist;
unsigned int len;
sglist = sg_state->sglist + sg_state->next_sglist;
/* try to start the next DMA transfer */
if (sg_state->next_sglist + 1 == sg_state->sglen) {
/*
* On the last sg, we handle the case where
* cam->img.pix.sizeimage % PAGE_ALIGN != 0
*/
len = sg_state->len - sg_state->bytes_read;
} else {
len = sg_dma_len(sglist);
}
if (omap24xxcam_dma_start(&sgdma->dma,
sg_dma_address(sglist),
len,
omap24xxcam_sgdma_callback,
(void *)sgslot)) {
/* DMA start failed */
spin_unlock_irqrestore(&sgdma->lock, flags);
return;
} else {
unsigned long expires;
/* DMA start was successful */
sg_state->next_sglist++;
sg_state->bytes_read += len;
sg_state->queued_sglist++;
/* We start the reset timer */
expires = jiffies + HZ;
mod_timer(&sgdma->reset_timer, expires);
}
}
queued_sgdma--;
sgslot = (sgslot + 1) % NUM_SG_DMA;
}
spin_unlock_irqrestore(&sgdma->lock, flags);
}
/*
* Queue a scatter-gather DMA transfer from the camera to memory.
* Returns zero if the transfer was successfully queued, or non-zero
* if all of the scatter-gather slots are already in use.
*/
int omap24xxcam_sgdma_queue(struct omap24xxcam_sgdma *sgdma,
const struct scatterlist *sglist, int sglen,
int len, sgdma_callback_t callback, void *arg)
{
unsigned long flags;
struct sgdma_state *sg_state;
if ((sglen < 0) || ((sglen > 0) && !sglist))
return -EINVAL;
spin_lock_irqsave(&sgdma->lock, flags);
if (!sgdma->free_sgdma) {
spin_unlock_irqrestore(&sgdma->lock, flags);
return -EBUSY;
}
sg_state = sgdma->sg_state + sgdma->next_sgdma;
sg_state->sglist = sglist;
sg_state->sglen = sglen;
sg_state->next_sglist = 0;
sg_state->bytes_read = 0;
sg_state->len = len;
sg_state->queued_sglist = 0;
sg_state->csr = 0;
sg_state->callback = callback;
sg_state->arg = arg;
sgdma->next_sgdma = (sgdma->next_sgdma + 1) % NUM_SG_DMA;
sgdma->free_sgdma--;
spin_unlock_irqrestore(&sgdma->lock, flags);
omap24xxcam_sgdma_process(sgdma);
return 0;
}
/* Sync scatter-gather DMA by aborting any DMA transfers currently in progress.
* Any queued scatter-gather DMA transactions that have not yet been started
* will remain queued. The DMA controller will be idle after this routine
* completes. When the scatter-gather queue is restarted, the next
* scatter-gather DMA transfer will begin at the start of a new transaction.
*/
void omap24xxcam_sgdma_sync(struct omap24xxcam_sgdma *sgdma)
{
unsigned long flags;
int sgslot;
struct sgdma_state *sg_state;
u32 csr = CAMDMA_CSR_TRANS_ERR;
/* stop any DMA transfers in progress */
omap24xxcam_dma_stop(&sgdma->dma, csr);
spin_lock_irqsave(&sgdma->lock, flags);
if (sgdma->free_sgdma < NUM_SG_DMA) {
sgslot = (sgdma->next_sgdma + sgdma->free_sgdma) % NUM_SG_DMA;
sg_state = sgdma->sg_state + sgslot;
if (sg_state->next_sglist != 0) {
/* This DMA transfer was in progress, so abort it. */
sgdma_callback_t callback = sg_state->callback;
void *arg = sg_state->arg;
sgdma->free_sgdma++;
if (callback) {
/* leave interrupts masked */
spin_unlock(&sgdma->lock);
(*callback) (sgdma, csr, arg);
spin_lock(&sgdma->lock);
}
}
}
spin_unlock_irqrestore(&sgdma->lock, flags);
}
void omap24xxcam_sgdma_init(struct omap24xxcam_sgdma *sgdma,
unsigned long base,
void (*reset_callback)(unsigned long data),
unsigned long reset_callback_data)
{
int sg;
spin_lock_init(&sgdma->lock);
sgdma->free_sgdma = NUM_SG_DMA;
sgdma->next_sgdma = 0;
for (sg = 0; sg < NUM_SG_DMA; sg++) {
sgdma->sg_state[sg].sglen = 0;
sgdma->sg_state[sg].next_sglist = 0;
sgdma->sg_state[sg].bytes_read = 0;
sgdma->sg_state[sg].queued_sglist = 0;
sgdma->sg_state[sg].csr = 0;
sgdma->sg_state[sg].callback = NULL;
sgdma->sg_state[sg].arg = NULL;
}
omap24xxcam_dma_init(&sgdma->dma, base);
setup_timer(&sgdma->reset_timer, reset_callback, reset_callback_data);
}