static int s3c2410_dma_dostop(struct s3c2410_dma_chan *chan)
{
unsigned long flags;
unsigned long tmp;
pr_debug("%s:\n", __func__);
dbg_showchan(chan);
local_irq_save(flags);
s3c2410_dma_call_op(chan, S3C2410_DMAOP_STOP);
tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
tmp |= S3C2410_DMASKTRIG_STOP;
//tmp &= ~S3C2410_DMASKTRIG_ON;
dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp);
#if 0
/* should also clear interrupts, according to WinCE BSP */
tmp = dma_rdreg(chan, S3C2410_DMA_DCON);
tmp |= S3C2410_DCON_NORELOAD;
dma_wrreg(chan, S3C2410_DMA_DCON, tmp);
#endif
/* should stop do this, or should we wait for flush? */
chan->state = S3C2410_DMA_IDLE;
chan->load_state = S3C2410_DMALOAD_NONE;
local_irq_restore(flags);
return 0;
}
void s3c_dma_dump(int dcon_num, int channel)
{
unsigned long tmp;
s3c_dma_controller_t *dma_controller = &s3c_dma_cntlrs[dcon_num];
tmp = dma_rdreg(dma_controller, S3C_DMAC_INT_STATUS);
printk("%d dcon_num %d subchnnel INT_STATUS %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_INT_TCSTATUS);
printk("%d dcon_num %d subchnnel INT_TCSTATUS %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_ENBLD_CHANNELS);
printk("%d dcon_num %d subchnnel ENBLD_CHANNELS %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CONFIGURATION);
printk("%d dcon_num %d subchnnel DMAC_CONFIGUARATION %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CSRCADDR(channel));
printk("%d dcon_num %d subchnnel SRCADDRESS %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CDESTADDR(channel));
printk("%d dcon_num %d subchnnel DESTADDRESS %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CLLI(channel));
printk("%d dcon_num %d subchnnel LLI %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CCONTROL0(channel));
printk("%d dcon_num %d subchnnel CCONTROL0 %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CCONTROL1(channel));
printk("%d dcon_num %d subchnnel CCONTROL1 %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CCONFIGURATION(channel));
printk("%d dcon_num %d subchnnel CH CONFIGUARATION %lx\n", dcon_num, channel, tmp);
}
static void
dmadbg_capture(struct s3c2410_dma_chan *chan, struct s3c2410_dma_regstate *regs)
{
regs->dcsrc = dma_rdreg(chan, S3C2410_DMA_DCSRC);
regs->disrc = dma_rdreg(chan, S3C2410_DMA_DISRC);
regs->dstat = dma_rdreg(chan, S3C2410_DMA_DSTAT);
regs->dcon = dma_rdreg(chan, S3C2410_DMA_DCON);
regs->dmsktrig = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
}
void s3c_clear_interrupts (int dcon_num, int channel)
{
unsigned long tmp;
s3c_dma_controller_t *dma_controller = &s3c_dma_cntlrs[dcon_num];
tmp = dma_rdreg(dma_controller, S3C_DMAC_INT_TCCLEAR);
tmp |= (1 << channel);
dma_wrreg(dma_controller, S3C_DMAC_INT_TCCLEAR, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_INT_ERRORCLEAR);
tmp |= (1 << channel);
dma_wrreg(dma_controller, S3C_DMAC_INT_ERRORCLEAR, tmp);
}
int s3c2410_dma_getposition(dmach_t channel, dma_addr_t *src, dma_addr_t *dst)
{
s3c2410_dma_chan_t *chan = &s3c2410_chans[channel];
check_channel(channel);
if (src != NULL)
*src = dma_rdreg(chan, S3C2410_DMA_DCSRC);
if (dst != NULL)
*dst = dma_rdreg(chan, S3C2410_DMA_DCDST);
return 0;
}
/*
* s3c2410_dma_getposition
* returns the current transfer points for the dma source and destination
*/
int s3c2410_dma_getposition(dmach_t channel, dma_addr_t *src, dma_addr_t *dst)
{
struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
if (chan == NULL)
return -EINVAL;
if (src != NULL)
*src = dma_rdreg(chan->dma_con, S3C_DMAC_SA(chan->number));
if (dst != NULL)
*dst = dma_rdreg(chan->dma_con, S3C_DMAC_DA(chan->number));
return 0;
}
/*
* s3c_dma_getposition
* returns the current transfer points for the dma source and destination
*/
int s3c2410_dma_getposition(dmach_t channel, dma_addr_t *src, dma_addr_t *dst)
{
struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
if (chan == NULL)
return -EINVAL;
if (src != NULL)
*src = dma_rdreg(chan, S3C_DMAC_CxSRCADDR);
if (dst != NULL)
*dst = dma_rdreg(chan, S3C_DMAC_CxDESTADDR);
return 0;
}
int s3c2410_dma_getposition(unsigned int channel, dma_addr_t *src, dma_addr_t *dst)
{
struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
if (chan == NULL)
return -EINVAL;
if (src != NULL)
*src = dma_rdreg(chan, S3C2410_DMA_DCSRC);
if (dst != NULL)
*dst = dma_rdreg(chan, S3C2410_DMA_DCDST);
return 0;
}
/*actively polling for the A bit can block the cpu*/
void s3c_dma_flush_fifo(struct s3c2410_dma_chan *chan)
{
unsigned long tmp;
tmp = dma_rdreg(chan, S3C_DMAC_CxCONFIGURATION);
tmp |= S3C_DMACONFIG_HALT;
dma_wrreg(chan, S3C_DMAC_CxCONFIGURATION, tmp);
tmp = dma_rdreg(chan, S3C_DMAC_CxCONFIGURATION);
/*this while loop can be very dangerous..may be put the process to sleep rather than waiting till fifo is drained */
while (tmp & S3C_DMACONFIG_ACTIVE) {
tmp = dma_rdreg(chan, S3C_DMAC_CxCONFIGURATION);
}
}
static int s3c_dma_dostop(struct s3c2410_dma_chan *chan)
{
unsigned long tmp;
unsigned long flags;
pr_debug("%s: DMA Channel No : %d\n", __FUNCTION__, chan->number);
dbg_showchan(chan);
local_irq_save(flags);
s3c_dma_flush_fifo(chan);
s3c_dma_call_op(chan, S3C2410_DMAOP_STOP);
tmp = dma_rdreg(chan, S3C_DMAC_CxCONFIGURATION);
tmp &= ~S3C_DMACONFIG_CHANNEL_ENABLE;
dma_wrreg(chan, S3C_DMAC_CxCONFIGURATION, tmp);
pr_debug("%s: S3C_DMAC_CxCONFIGURATION : %08x\n", __FUNCTION__, tmp);
chan->state = S3C_DMA_IDLE;
chan->load_state = S3C_DMALOAD_NONE;
local_irq_restore(flags);
return 0;
}
static int s3c_dma_dostop(struct s3c2410_dma_chan *chan)
{
unsigned long tmp;
unsigned long flags;
pr_debug("%s: DMA Channel No : %d\n", __FUNCTION__, chan->number);
dbg_showchan(chan);
local_irq_save(flags);
//Commenting out this function call(as its causing freeze) and even without this it adheres to
//ARM Primecell 080's disabling a DMA channel and losing data in the FIFO method
//s3c_dma_flush_fifo(chan);
s3c_dma_call_op(chan, S3C2410_DMAOP_STOP);
tmp = dma_rdreg(chan, S3C_DMAC_CxCONFIGURATION);
tmp &= ~S3C_DMACONFIG_CHANNEL_ENABLE;
dma_wrreg(chan, S3C_DMAC_CxCONFIGURATION, tmp);
pr_debug("%s: S3C_DMAC_CxCONFIGURATION : %08x\n", __FUNCTION__, tmp);
chan->state = S3C_DMA_IDLE;
chan->load_state = S3C_DMALOAD_NONE;
local_irq_restore(flags);
return 0;
}
void s3c_disable_dmac(unsigned int dcon_num)
{
unsigned long tmp;
s3c_dma_controller_t *dma_controller = &s3c_dma_cntlrs[dcon_num];
tmp = dma_rdreg(dma_controller, S3C_DMAC_CONFIGURATION);
tmp &= ~S3C_DMA_CONTROLLER_ENABLE;
dma_wrreg(dma_controller, S3C_DMAC_CONFIGURATION, tmp);
}
void dma_test (int dcon_num, int channel)
{
int tmp;
s3c_dma_controller_t *dma_controller = &s3c_dma_cntlrs[dcon_num];
dma_wrreg(dma_controller, S3C_DMAC_CONFIGURATION, S3C_DMA_CONTROLLER_ENABLE);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CONFIGURATION);
printk("reg val %d\n", tmp);
dma_wrreg(dma_controller, S3C_DMAC_CCONFIGURATION(channel), 0x01);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CCONFIGURATION(channel));
printk("reg conf %x\n", tmp);
dma_wrreg(dma_controller, S3C_DMAC_CCONTROL0(channel), 0x8ff02064);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CCONTROL0(channel));
printk("reg ctrl %x\n", tmp);
}
static int s3c2410_dma_flush(struct s3c2410_dma_chan *chan)
{
struct s3c2410_dma_buf *buf, *next;
unsigned long flags;
pr_debug("%s: chan %p (%d)\n", __func__, chan, chan->number);
dbg_showchan(chan);
local_irq_save(flags);
if (chan->state != S3C2410_DMA_IDLE) {
pr_debug("%s: stopping channel...\n", __func__ );
s3c2410_dma_ctrl(chan->number, S3C2410_DMAOP_STOP);
}
buf = chan->curr;
if (buf == NULL)
buf = chan->next;
chan->curr = chan->next = chan->end = NULL;
if (buf != NULL) {
for ( ; buf != NULL; buf = next) {
next = buf->next;
pr_debug("%s: free buffer %p, next %p\n",
__func__, buf, buf->next);
s3c2410_dma_buffdone(chan, buf, S3C2410_RES_ABORT);
s3c2410_dma_freebuf(buf);
}
}
dbg_showregs(chan);
s3c2410_dma_waitforstop(chan);
#if 0
/* should also clear interrupts, according to WinCE BSP */
{
unsigned long tmp;
tmp = dma_rdreg(chan, S3C2410_DMA_DCON);
tmp |= S3C2410_DCON_NORELOAD;
dma_wrreg(chan, S3C2410_DMA_DCON, tmp);
}
#endif
dbg_showregs(chan);
local_irq_restore(flags);
return 0;
}
static void s3c2410_dma_waitforstop(struct s3c2410_dma_chan *chan)
{
unsigned long tmp;
unsigned int timeout = 0x10000;
while (timeout-- > 0) {
tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
if (!(tmp & S3C2410_DMASKTRIG_ON))
return;
}
pr_debug("dma%d: failed to stop?\n", chan->number);
}
static void s3c2410_dma_suspend_chan(struct s3c2410_dma_chan *cp)
{
printk(KERN_DEBUG "suspending dma channel %d\n", cp->number);
if (dma_rdreg(cp, S3C2410_DMA_DMASKTRIG) & S3C2410_DMASKTRIG_ON) {
/* the dma channel is still working, which is probably
* a bad thing to do over suspend/resume. We stop the
* channel and assume that the client is either going to
* retry after resume, or that it is broken.
*/
printk(KERN_INFO "dma: stopping channel %d due to suspend\n",
cp->number);
s3c2410_dma_dostop(cp);
}
}
/* s3c_dma_waitforload
*
* wait for the DMA engine to load a buffer, and update the state accordingly
*/
static int s3c_dma_waitforload(struct s3c2410_dma_chan *chan, int line)
{
int timeout = chan->load_timeout;
int took;
pr_debug("%s channel number : %d\n", __FUNCTION__, chan->number);
if (chan->load_state != S3C_DMALOAD_1LOADED) {
printk(KERN_ERR
"dma%d: s3c_dma_waitforload() called in loadstate %d from line %d\n",
chan->number, chan->load_state, line);
return 0;
}
if (chan->stats != NULL)
chan->stats->loads++;
while (--timeout > 0) {
if ((dma_rdreg(chan->dma_con, S3C_DMAC_ENBLD_CHANNELS)) & (0x1 << chan->number)) {
took = chan->load_timeout - timeout;
s3c_dma_stats_timeout(chan->stats, took);
switch (chan->load_state) {
case S3C_DMALOAD_1LOADED:
chan->load_state = S3C_DMALOAD_1RUNNING;
break;
default:
printk(KERN_ERR
"dma%d: unknown load_state in s3c_dma_waitforload() %d\n",
chan->number, chan->load_state);
}
return 1;
}
}
if (chan->stats != NULL) {
chan->stats->timeout_failed++;
}
return 0;
}
static int s3c2410_dma_suspend(struct sys_device *dev, pm_message_t state)
{
s3c2410_dma_chan_t *cp = container_of(dev, s3c2410_dma_chan_t, dev);
printk(KERN_DEBUG "suspending dma channel %d\n", cp->number);
if (dma_rdreg(cp, S3C2410_DMA_DMASKTRIG) & S3C2410_DMASKTRIG_ON) {
/* the dma channel is still working, which is probably
* a bad thing to do over suspend/resume. We stop the
* channel and assume that the client is either going to
* retry after resume, or that it is broken.
*/
printk(KERN_INFO "dma: stopping channel %d due to suspend\n",
cp->number);
s3c2410_dma_dostop(cp);
}
return 0;
}
static int
s3c2410_dma_waitforload(struct s3c2410_dma_chan *chan, int line)
{
int timeout = chan->load_timeout;
int took;
if (chan->load_state != S3C2410_DMALOAD_1LOADED) {
printk(KERN_ERR "dma%d: s3c2410_dma_waitforload() called in loadstate %d from line %d\n", chan->number, chan->load_state, line);
return 0;
}
if (chan->stats != NULL)
chan->stats->loads++;
while (--timeout > 0) {
if ((dma_rdreg(chan, S3C2410_DMA_DSTAT) << (32-20)) != 0) {
took = chan->load_timeout - timeout;
s3c2410_dma_stats_timeout(chan->stats, took);
switch (chan->load_state) {
case S3C2410_DMALOAD_1LOADED:
chan->load_state = S3C2410_DMALOAD_1RUNNING;
break;
default:
printk(KERN_ERR "dma%d: unknown load_state in s3c2410_dma_waitforload() %d\n", chan->number, chan->load_state);
}
return 1;
}
}
if (chan->stats != NULL) {
chan->stats->timeout_failed++;
}
return 0;
}
/* s3c_dma_loadbuffer
*
* load a buffer, and update the channel state
*/
static inline int s3c_dma_loadbuffer(struct s3c2410_dma_chan *chan,
struct s3c_dma_buf *buf)
{
unsigned long tmp;
pl330_DMA_parameters_t dma_param;
struct s3c_dma_buf *firstbuf;
int bwJump = 0;
memset(&dma_param, 0, sizeof(pl330_DMA_parameters_t));
pr_debug("s3c_chan_loadbuffer: loading buffer %p (0x%08lx,0x%06x)\n",
buf, (unsigned long) buf->data, buf->size);
if (buf == NULL) {
dmawarn("buffer is NULL\n");
return -EINVAL;
}
pr_debug("%s: DMA CCR - %08x\n", __FUNCTION__, chan->dcon);
pr_debug("%s: DMA Loop count - %08x\n", __FUNCTION__, (buf->size / chan->xfer_unit));
firstbuf = buf;
do {
dma_param.mPeriNum = chan->config_flags;
dma_param.mDirection = chan->source;
switch (dma_param.mDirection) {
case S3C2410_DMASRC_MEM: /* source is Memory : Mem-to-Peri (Write into FIFO) */
dma_param.mSrcAddr = buf->data;
dma_param.mDstAddr = chan->dev_addr;
break;
case S3C2410_DMASRC_HW: /* source is peripheral : Peri-to-Mem (Read from FIFO) */
dma_param.mSrcAddr = chan->dev_addr;
dma_param.mDstAddr = buf->data;
break;
case S3C_DMA_MEM2MEM: /* source & Destination : Mem-to-Mem */
dma_param.mSrcAddr = chan->dev_addr;
dma_param.mDstAddr = buf->data;
break;
case S3C_DMA_MEM2MEM_SET: /* source & Destination : Mem-to-Mem */
dma_param.mDirection = S3C_DMA_MEM2MEM;
dma_param.mSrcAddr = chan->dev_addr;
dma_param.mDstAddr = buf->data;
break;
case S3C_DMA_PER2PER:
default:
printk("Peripheral-to-Peripheral DMA NOT YET implemented !! \n");
return -EINVAL;
}
dma_param.mTrSize = buf->size;
dma_param.mLoop = 0;
dma_param.mControl = *(pl330_DMA_control_t *) &chan->dcon;
chan->next = buf->next;
buf = chan->next;
if(buf==NULL) {
firstbuf->next = NULL;
dma_param.mLastReq = 1;
dma_param.mIrqEnable = 1;
}
else {
dma_param.mLastReq = 0;
dma_param.mIrqEnable = 0;
}
bwJump += setup_DMA_channel(((u8 *)firstbuf->mcptr_cpu)+bwJump, dma_param, chan->number);
pr_debug("%s: DMA bwJump - %d\n", __FUNCTION__, bwJump);
}while(buf != NULL);
if(dma_param.mIrqEnable) {
tmp = dma_rdreg(chan->dma_con, S3C_DMAC_INTEN);
tmp |= (1 << chan->number);
dma_wrreg(chan->dma_con, S3C_DMAC_INTEN, tmp);
}
/* update the state of the channel */
switch (chan->load_state) {
case S3C_DMALOAD_NONE:
chan->load_state = S3C_DMALOAD_1LOADED;
break;
case S3C_DMALOAD_1RUNNING:
chan->load_state = S3C_DMALOAD_1LOADED_1RUNNING;
break;
default:
dmawarn("dmaload: unknown state %d in loadbuffer\n", chan->load_state);
break;
}
return 0;
}
static int s3c2410_dma_start(struct s3c2410_dma_chan *chan)
{
unsigned long tmp;
unsigned long flags;
pr_debug("s3c2410_start_dma: channel=%d\n", chan->number);
local_irq_save(flags);
if (chan->state == S3C2410_DMA_RUNNING) {
pr_debug("s3c2410_start_dma: already running (%d)\n", chan->state);
local_irq_restore(flags);
return 0;
}
chan->state = S3C2410_DMA_RUNNING;
/* check wether there is anything to load, and if not, see
* if we can find anything to load
*/
if (chan->load_state == S3C2410_DMALOAD_NONE) {
if (chan->next == NULL) {
printk(KERN_ERR "dma%d: channel has nothing loaded\n",
chan->number);
chan->state = S3C2410_DMA_IDLE;
local_irq_restore(flags);
return -EINVAL;
}
s3c2410_dma_loadbuffer(chan, chan->next);
}
dbg_showchan(chan);
/* enable the channel */
if (!chan->irq_enabled) {
enable_irq(chan->irq);
chan->irq_enabled = 1;
}
/* start the channel going */
tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
tmp &= ~S3C2410_DMASKTRIG_STOP;
tmp |= S3C2410_DMASKTRIG_ON;
dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp);
pr_debug("dma%d: %08lx to DMASKTRIG\n", chan->number, tmp);
#if 0
/* the dma buffer loads should take care of clearing the AUTO
* reloading feature */
tmp = dma_rdreg(chan, S3C2410_DMA_DCON);
tmp &= ~S3C2410_DCON_NORELOAD;
dma_wrreg(chan, S3C2410_DMA_DCON, tmp);
#endif
s3c2410_dma_call_op(chan, S3C2410_DMAOP_START);
dbg_showchan(chan);
/* if we've only loaded one buffer onto the channel, then chec
* to see if we have another, and if so, try and load it so when
* the first buffer is finished, the new one will be loaded onto
* the channel */
if (chan->next != NULL) {
if (chan->load_state == S3C2410_DMALOAD_1LOADED) {
if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
pr_debug("%s: buff not yet loaded, no more todo\n",
__func__);
} else {
chan->load_state = S3C2410_DMALOAD_1RUNNING;
s3c2410_dma_loadbuffer(chan, chan->next);
}
} else if (chan->load_state == S3C2410_DMALOAD_1RUNNING) {
s3c2410_dma_loadbuffer(chan, chan->next);
}
}
local_irq_restore(flags);
return 0;
}
static irqreturn_t
s3c2410_dma_irq(int irq, void *devpw)
{
struct s3c2410_dma_chan *chan = (struct s3c2410_dma_chan *)devpw;
struct s3c2410_dma_buf *buf;
buf = chan->curr;
dbg_showchan(chan);
/* modify the channel state */
switch (chan->load_state) {
case S3C2410_DMALOAD_1RUNNING:
/* TODO - if we are running only one buffer, we probably
* want to reload here, and then worry about the buffer
* callback */
chan->load_state = S3C2410_DMALOAD_NONE;
break;
case S3C2410_DMALOAD_1LOADED:
/* iirc, we should go back to NONE loaded here, we
* had a buffer, and it was never verified as being
* loaded.
*/
chan->load_state = S3C2410_DMALOAD_NONE;
break;
case S3C2410_DMALOAD_1LOADED_1RUNNING:
/* we'll worry about checking to see if another buffer is
* ready after we've called back the owner. This should
* ensure we do not wait around too long for the DMA
* engine to start the next transfer
*/
chan->load_state = S3C2410_DMALOAD_1LOADED;
break;
case S3C2410_DMALOAD_NONE:
printk(KERN_ERR "dma%d: IRQ with no loaded buffer?\n",
chan->number);
break;
default:
printk(KERN_ERR "dma%d: IRQ in invalid load_state %d\n",
chan->number, chan->load_state);
break;
}
if (buf != NULL) {
/* update the chain to make sure that if we load any more
* buffers when we call the callback function, things should
* work properly */
chan->curr = buf->next;
buf->next = NULL;
if (buf->magic != BUF_MAGIC) {
printk(KERN_ERR "dma%d: %s: buf %p incorrect magic\n",
chan->number, __func__, buf);
return IRQ_HANDLED;
}
s3c2410_dma_buffdone(chan, buf, S3C2410_RES_OK);
/* free resouces */
s3c2410_dma_freebuf(buf);
} else {
}
/* only reload if the channel is still running... our buffer done
* routine may have altered the state by requesting the dma channel
* to stop or shutdown... */
/* todo: check that when the channel is shut-down from inside this
* function, we cope with unsetting reload, etc */
if (chan->next != NULL && chan->state != S3C2410_DMA_IDLE) {
unsigned long flags;
unsigned long tmp;
switch (chan->load_state) {
case S3C2410_DMALOAD_1RUNNING:
/* don't need to do anything for this state */
break;
case S3C2410_DMALOAD_NONE:
/* can load buffer immediately */
break;
case S3C2410_DMALOAD_1LOADED:
/* printk(KERN_INFO "DMA: 1 LOADED\n"); */
//if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
// /* flag error? */
// printk(KERN_ERR "dma%d: timeout waiting for load (%s)\n",
// chan->number, __func__);
// return IRQ_HANDLED;
//}
break;
case S3C2410_DMALOAD_1LOADED_1RUNNING:
goto no_load;
default:
printk(KERN_ERR "dma%d: unknown load_state in irq, %d\n",
chan->number, chan->load_state);
return IRQ_HANDLED;
}
/*
* Since we are not using the auto-reload feature, we must restart
* the DMA-channel at this point
* (Luis Galdos)
*/
local_irq_save(flags);
chan->load_state = S3C2410_DMALOAD_NONE;
s3c2410_dma_loadbuffer(chan, chan->curr);
tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
tmp &= ~S3C2410_DMASKTRIG_STOP;
tmp |= S3C2410_DMASKTRIG_ON;
dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp);
s3c2410_dma_call_op(chan, S3C2410_DMAOP_START);
local_irq_restore(flags);
} else {
s3c2410_dma_lastxfer(chan);
/* see if we can stop this channel.. */
if (chan->load_state == S3C2410_DMALOAD_NONE) {
pr_debug("dma%d: end of transfer, stopping channel (%ld)\n",
chan->number, jiffies);
s3c2410_dma_ctrl(chan->number | DMACH_LOW_LEVEL,
S3C2410_DMAOP_STOP);
}
}
no_load:
return IRQ_HANDLED;
}
void s3c_dma_dump(int dcon_num, int channel)
{
unsigned long tmp;
s3c_dma_controller_t *dma_controller = &s3c_dma_cntlrs[dcon_num];
tmp = dma_rdreg(dma_controller, S3C_DMAC_DS);
printk("%d dcon_num %d chnnel : DMA status %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_DPC);
printk("%d dcon_num %d chnnel : DMA program counter %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_INTEN);
printk("%d dcon_num %d chnnel : INT enable %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_ES);
printk("%d dcon_num %d chnnel : Event status %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_INTSTATUS);
printk("%d dcon_num %d chnnel : INT status %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_FSC);
printk("%d dcon_num %d chnnel : Fault status %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_FTC(channel));
printk("%d dcon_num %d chnnel : Fault type %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CS(channel));
printk("%d dcon_num %d chnnel : Channel status %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_CPC(channel));
printk("%d dcon_num %d chnnel : Channel program counter %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_SA(channel));
printk("%d dcon_num %d chnnel : Source address %lx\n", dcon_num, channel, tmp);
tmp = dma_rdreg(dma_controller, S3C_DMAC_DA(channel));
printk("%d dcon_num %d chnnel : Destination address %lx\n", dcon_num, channel, tmp);
}
static irqreturn_t s3c_dma_irq(int irq, void *devpw)
{
unsigned int channel = 0, dcon_num, i;
unsigned long tmp;
s3c_dma_controller_t *dma_controller = (s3c_dma_controller_t *) devpw;
struct s3c2410_dma_chan *chan=NULL;
struct s3c_dma_buf *buf;
dcon_num = dma_controller->number;
tmp = dma_rdreg(dma_controller, S3C_DMAC_INTSTATUS);
pr_debug("# s3c_dma_irq: IRQ status : 0x%x\n", tmp);
if (tmp == 0)
return IRQ_HANDLED;
for (i = 0; i < S3C_CHANNELS_PER_DMA; i++) {
if (tmp & 0x01) {
pr_debug("# DMAC %d: requestor %d\n", dcon_num, i);
channel = i;
chan = &s3c_dma_chans[channel + dcon_num * S3C_CHANNELS_PER_DMA];
pr_debug("# DMA CH:%d, index:%d load_state:%d\n", chan->number, chan->index, chan->load_state);
buf = chan->curr;
dbg_showchan(chan);
/* modify the channel state */
switch (chan->load_state) {
case S3C_DMALOAD_1RUNNING:
/* TODO - if we are running only one buffer, we probably
* want to reload here, and then worry about the buffer
* callback */
chan->load_state = S3C_DMALOAD_NONE;
break;
case S3C_DMALOAD_1LOADED:
/* iirc, we should go back to NONE loaded here, we
* had a buffer, and it was never verified as being
* loaded.
*/
chan->load_state = S3C_DMALOAD_NONE;
break;
case S3C_DMALOAD_1LOADED_1RUNNING:
/* we'll worry about checking to see if another buffer is
* ready after we've called back the owner. This should
* ensure we do not wait around too long for the DMA
* engine to start the next transfer
*/
chan->load_state = S3C_DMALOAD_1LOADED;
break;
case S3C_DMALOAD_NONE:
printk(KERN_ERR "dma%d: IRQ with no loaded buffer?\n",
chan->number);
break;
default:
printk(KERN_ERR "dma%d: IRQ in invalid load_state %d\n",
chan->number, chan->load_state);
break;
}
if (buf != NULL) {
/* update the chain to make sure that if we load any more
* buffers when we call the callback function, things should
* work properly */
chan->curr = buf->next;
buf->next = NULL;
if (buf->magic != BUF_MAGIC) {
printk(KERN_ERR "dma CH %d: %s: buf %p incorrect magic\n",
chan->number, __FUNCTION__, buf);
goto next_channel;
}
s3c_dma_buffdone(chan, buf, S3C2410_RES_OK);
/* free resouces */
s3c_dma_freebuf(buf);
} else {
}
/* only reload if the channel is still running... our buffer done
* routine may have altered the state by requesting the dma channel
* to stop or shutdown... */
if (chan->next != NULL && chan->state != S3C_DMA_IDLE) {
unsigned long flags;
switch (chan->load_state) {
case S3C_DMALOAD_1RUNNING:
/* don't need to do anything for this state */
break;
case S3C_DMALOAD_NONE:
/* can load buffer immediately */
break;
case S3C_DMALOAD_1LOADED:
if (s3c_dma_waitforload(chan, __LINE__) == 0) {
/* flag error? */
printk(KERN_ERR "dma CH %d: timeout waiting for load\n",
chan->number);
goto next_channel;
}
break;
case S3C_DMALOAD_1LOADED_1RUNNING:
goto next_channel;
default:
printk(KERN_ERR "dma CH %d: unknown load_state in irq, %d\n",
chan->number, chan->load_state);
goto next_channel;
}
local_irq_save(flags);
s3c_dma_loadbuffer(chan, chan->next);
start_DMA_channel(dma_regaddr(chan->dma_con, S3C_DMAC_DBGSTATUS), chan->number,
chan->curr->mcptr, PL330_NON_SECURE_DMA);
local_irq_restore(flags);
} else {
s3c_dma_lastxfer(chan);
/* see if we can stop this channel.. */
if (chan->load_state == S3C_DMALOAD_NONE) {
pr_debug("# DMA CH %d - (index:%d): end of transfer, stopping channel (%ld)\n",
chan->number, chan->index, jiffies);
s3c2410_dma_ctrl(chan->index | DMACH_LOW_LEVEL, S3C2410_DMAOP_STOP);
}
}
s3c_clear_interrupts(chan->dma_con->number, chan->number);
}
next_channel:
tmp >>= 1;
}
return IRQ_HANDLED;
}
static int s3c2410_dma_start(s3c2410_dma_chan_t *chan)
{
unsigned long tmp;
unsigned long flags;
pr_debug("s3c2410_start_dma: channel=%d\n", chan->number);
local_irq_save(flags);
if (chan->state == S3C2410_DMA_RUNNING) {
pr_debug("s3c2410_start_dma: already running (%d)\n", chan->state);
local_irq_restore(flags);
return 0;
}
chan->state = S3C2410_DMA_RUNNING;
/* check wether there is anything to load, and if not, see
* if we can find anything to load
*/
if (chan->load_state == S3C2410_DMALOAD_NONE) {
if (chan->next == NULL) {
printk(KERN_ERR "dma%d: channel has nothing loaded\n",
chan->number);
chan->state = S3C2410_DMA_IDLE;
local_irq_restore(flags);
return -EINVAL;
}
s3c2410_dma_loadbuffer(chan, chan->next);
}
dbg_showchan(chan);
/* enable the channel */
if (!chan->irq_enabled) {
enable_irq(chan->irq);
chan->irq_enabled = 1;
}
/* start the channel going */
tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
tmp &= ~S3C2410_DMASKTRIG_STOP;
tmp |= S3C2410_DMASKTRIG_ON;
dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp);
pr_debug("wrote %08lx to DMASKTRIG\n", tmp);
#if 0
/* the dma buffer loads should take care of clearing the AUTO
* reloading feature */
tmp = dma_rdreg(chan, S3C2410_DMA_DCON);
tmp &= ~S3C2410_DCON_NORELOAD;
dma_wrreg(chan, S3C2410_DMA_DCON, tmp);
#endif
s3c2410_dma_call_op(chan, S3C2410_DMAOP_START);
dbg_showchan(chan);
local_irq_restore(flags);
return 0;
}
