diff options
Diffstat (limited to 'drivers/dma/amba-pl08x.c')
-rw-r--r-- | drivers/dma/amba-pl08x.c | 52 |
1 files changed, 41 insertions, 11 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index 3d704ab..49ecbbb 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -95,10 +95,14 @@ static struct amba_driver pl08x_amba_driver; * struct vendor_data - vendor-specific config parameters for PL08x derivatives * @channels: the number of channels available in this variant * @dualmaster: whether this version supports dual AHB masters or not. + * @nomadik: whether the channels have Nomadik security extension bits + * that need to be checked for permission before use and some registers are + * missing */ struct vendor_data { u8 channels; bool dualmaster; + bool nomadik; }; /* @@ -385,7 +389,7 @@ pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, spin_lock_irqsave(&ch->lock, flags); - if (!ch->serving) { + if (!ch->locked && !ch->serving) { ch->serving = virt_chan; ch->signal = -1; spin_unlock_irqrestore(&ch->lock, flags); @@ -1324,7 +1328,7 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( int ret, tmp; dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", - __func__, sgl->length, plchan->name); + __func__, sg_dma_len(sgl), plchan->name); txd = pl08x_get_txd(plchan, flags); if (!txd) { @@ -1378,11 +1382,11 @@ static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( dsg->len = sg_dma_len(sg); if (direction == DMA_MEM_TO_DEV) { - dsg->src_addr = sg_phys(sg); + dsg->src_addr = sg_dma_address(sg); dsg->dst_addr = slave_addr; } else { dsg->src_addr = slave_addr; - dsg->dst_addr = sg_phys(sg); + dsg->dst_addr = sg_dma_address(sg); } } @@ -1484,6 +1488,9 @@ bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) */ static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) { + /* The Nomadik variant does not have the config register */ + if (pl08x->vd->nomadik) + return; writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG); } @@ -1616,7 +1623,7 @@ static irqreturn_t pl08x_irq(int irq, void *dev) __func__, err); writel(err, pl08x->base + PL080_ERR_CLEAR); } - tc = readl(pl08x->base + PL080_INT_STATUS); + tc = readl(pl08x->base + PL080_TC_STATUS); if (tc) writel(tc, pl08x->base + PL080_TC_CLEAR); @@ -1773,8 +1780,10 @@ static int pl08x_debugfs_show(struct seq_file *s, void *data) spin_lock_irqsave(&ch->lock, flags); virt_chan = ch->serving; - seq_printf(s, "%d\t\t%s\n", - ch->id, virt_chan ? virt_chan->name : "(none)"); + seq_printf(s, "%d\t\t%s%s\n", + ch->id, + virt_chan ? virt_chan->name : "(none)", + ch->locked ? " LOCKED" : ""); spin_unlock_irqrestore(&ch->lock, flags); } @@ -1918,7 +1927,7 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) } /* Initialize physical channels */ - pl08x->phy_chans = kmalloc((vd->channels * sizeof(*pl08x->phy_chans)), + pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)), GFP_KERNEL); if (!pl08x->phy_chans) { dev_err(&adev->dev, "%s failed to allocate " @@ -1933,8 +1942,23 @@ 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->serving = NULL; ch->signal = -1; + + /* + * Nomadik variants can have channels that are locked + * down for the secure world only. Lock up these channels + * by perpetually serving a dummy virtual channel. + */ + if (vd->nomadik) { + u32 val; + + val = readl(ch->base + PL080_CH_CONFIG); + if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) { + dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i); + ch->locked = true; + } + } + dev_dbg(&adev->dev, "physical channel %d is %s\n", i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE"); } @@ -2017,6 +2041,12 @@ static struct vendor_data vendor_pl080 = { .dualmaster = true, }; +static struct vendor_data vendor_nomadik = { + .channels = 8, + .dualmaster = true, + .nomadik = true, +}; + static struct vendor_data vendor_pl081 = { .channels = 2, .dualmaster = false, @@ -2037,9 +2067,9 @@ static struct amba_id pl08x_ids[] = { }, /* Nomadik 8815 PL080 variant */ { - .id = 0x00280880, + .id = 0x00280080, .mask = 0x00ffffff, - .data = &vendor_pl080, + .data = &vendor_nomadik, }, { 0, 0 }, }; |