diff options
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/amba-pl08x.c | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index b579bac56383..c203d2f22bca 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -136,17 +136,17 @@ struct pl08x_bus_data { * struct pl08x_phy_chan - holder for the physical channels * @id: physical index to this channel * @lock: a lock to use when altering an instance of this struct - * @signal: the physical signal (aka channel) serving this physical channel - * right now * @serving: the virtual channel currently being served by this physical * channel + * @locked: channel unavailable for the system, e.g. dedicated to secure + * world */ struct pl08x_phy_chan { unsigned int id; void __iomem *base; spinlock_t lock; - int signal; struct pl08x_dma_chan *serving; + bool locked; }; /** @@ -226,6 +226,7 @@ enum pl08x_dma_chan_state { * @slave: whether this channel is a device (slave) or for memcpy * @waiting: a TX descriptor on this channel which is waiting for a physical * channel to become available + * @signal: the physical DMA request signal which this channel is using */ struct pl08x_dma_chan { struct dma_chan chan; @@ -242,6 +243,7 @@ struct pl08x_dma_chan { enum pl08x_dma_chan_state state; bool slave; struct pl08x_txd *waiting; + int signal; }; /** @@ -303,7 +305,7 @@ static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx) * via a board/SoC specific external MUX. One important point to note * here is that this does not depend on the physical channel. */ -static int pl08x_request_mux(struct pl08x_dma_chan *plchan, struct pl08x_phy_chan *ch) +static int pl08x_request_mux(struct pl08x_dma_chan *plchan) { const struct pl08x_platform_data *pd = plchan->host->pd; int ret; @@ -313,7 +315,7 @@ static int pl08x_request_mux(struct pl08x_dma_chan *plchan, struct pl08x_phy_cha if (ret < 0) return ret; - ch->signal = ret; + plchan->signal = ret; } return 0; } @@ -322,9 +324,9 @@ static void pl08x_release_mux(struct pl08x_dma_chan *plchan) { const struct pl08x_platform_data *pd = plchan->host->pd; - if (plchan->phychan->signal >= 0 && pd->put_signal) { - pd->put_signal(plchan->cd, plchan->phychan->signal); - plchan->phychan->signal = -1; + if (plchan->signal >= 0 && pd->put_signal) { + pd->put_signal(plchan->cd, plchan->signal); + plchan->signal = -1; } } @@ -549,7 +551,6 @@ pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, if (!ch->locked && !ch->serving) { ch->serving = virt_chan; - ch->signal = -1; spin_unlock_irqrestore(&ch->lock, flags); break; } @@ -1033,7 +1034,7 @@ static int prep_phy_channel(struct pl08x_dma_chan *plchan, * Can the platform allow us to use this channel? */ if (plchan->slave) { - ret = pl08x_request_mux(plchan, ch); + ret = pl08x_request_mux(plchan); if (ret < 0) { dev_dbg(&pl08x->adev->dev, "unable to use physical channel %d for transfer on %s due to platform restrictions\n", @@ -1047,15 +1048,15 @@ static int prep_phy_channel(struct pl08x_dma_chan *plchan, plchan->phychan = ch; dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n", ch->id, - ch->signal, + plchan->signal, plchan->name); got_channel: /* Assign the flow control signal to this channel */ if (txd->direction == DMA_MEM_TO_DEV) - txd->ccfg |= ch->signal << PL080_CONFIG_DST_SEL_SHIFT; + txd->ccfg |= plchan->signal << PL080_CONFIG_DST_SEL_SHIFT; else if (txd->direction == DMA_DEV_TO_MEM) - txd->ccfg |= ch->signal << PL080_CONFIG_SRC_SEL_SHIFT; + txd->ccfg |= plchan->signal << PL080_CONFIG_SRC_SEL_SHIFT; plchan->phychan_hold++; @@ -1825,6 +1826,7 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, chan->host = pl08x; chan->state = PL08X_CHAN_IDLE; + chan->signal = -1; if (slave) { chan->cd = &pl08x->pd->slave_channels[i]; @@ -2062,7 +2064,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) ch->id = i; ch->base = pl08x->base + PL080_Cx_BASE(i); spin_lock_init(&ch->lock); - ch->signal = -1; /* * Nomadik variants can have channels that are locked |