From 7a73b135cdb33f78acab118dd72782416d5281b2 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Wed, 14 Oct 2015 14:43:05 +0300 Subject: dmaengine: edma: Rename bitfields for slot and channel usage tracking The names chosen for the bitfields were quite confusing and given no real information on what they are used for... edma_inuse -> slot_inuse: tracks the slot usage/availability edma_unused -> channel_unused: tracks the channel usage/availability Signed-off-by: Peter Ujfalusi Signed-off-by: Vinod Koul --- drivers/dma/edma.c | 51 ++++++++++++++++++++++++++------------------------- 1 file changed, 26 insertions(+), 25 deletions(-) (limited to 'drivers/dma/edma.c') diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 4b2ccc9de0ad..8d9169b7f208 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -227,16 +227,16 @@ struct edma_cc { enum dma_event_q default_queue; bool unused_chan_list_done; - /* The edma_inuse bit for each PaRAM slot is clear unless the + /* The slot_inuse bit for each PaRAM slot is clear unless the * channel is in use ... by ARM or DSP, for QDMA, or whatever. */ - unsigned long *edma_inuse; + unsigned long *slot_inuse; - /* The edma_unused bit for each channel is clear unless + /* The channel_unused bit for each channel is clear unless * it is not being used on this platform. It uses a bit * of SOC-specific initialization code. */ - unsigned long *edma_unused; + unsigned long *channel_unused; struct dma_device dma_slave; struct edma_chan *slave_chans; @@ -452,7 +452,7 @@ static int prepare_unused_channel_list(struct device *dev, void *data) continue; clear_bit(EDMA_CHAN_SLOT(dma_spec.args[0]), - ecc->edma_unused); + ecc->channel_unused); of_node_put(dma_spec.np); } return 0; @@ -469,7 +469,7 @@ static int prepare_unused_channel_list(struct device *dev, void *data) dma_req = (int)res->start; if (dma_req >= dma_req_min && dma_req < dma_req_max) clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start), - ecc->edma_unused); + ecc->channel_unused); } return 0; @@ -533,17 +533,17 @@ static int edma_alloc_slot(struct edma_cc *ecc, int slot) if (slot < 0) { slot = ecc->num_channels; for (;;) { - slot = find_next_zero_bit(ecc->edma_inuse, + slot = find_next_zero_bit(ecc->slot_inuse, ecc->num_slots, slot); if (slot == ecc->num_slots) return -ENOMEM; - if (!test_and_set_bit(slot, ecc->edma_inuse)) + if (!test_and_set_bit(slot, ecc->slot_inuse)) break; } } else if (slot < ecc->num_channels || slot >= ecc->num_slots) { return -EINVAL; - } else if (test_and_set_bit(slot, ecc->edma_inuse)) { + } else if (test_and_set_bit(slot, ecc->slot_inuse)) { return -EBUSY; } @@ -559,7 +559,7 @@ static void edma_free_slot(struct edma_cc *ecc, unsigned slot) return; edma_write_slot(ecc, slot, &dummy_paramset); - clear_bit(slot, ecc->edma_inuse); + clear_bit(slot, ecc->slot_inuse); } /** @@ -631,7 +631,7 @@ static int edma_start(struct edma_cc *ecc, unsigned channel) unsigned int mask = BIT(channel & 0x1f); /* EDMA channels without event association */ - if (test_bit(channel, ecc->edma_unused)) { + if (test_bit(channel, ecc->channel_unused)) { dev_dbg(ecc->dev, "ESR%d %08x\n", j, edma_shadow0_read_array(ecc, SH_ESR, j)); edma_shadow0_write_array(ecc, SH_ESR, j, mask); @@ -835,11 +835,11 @@ static int edma_alloc_channel(struct edma_cc *ecc, int channel, if (channel < 0) { channel = 0; for (;;) { - channel = find_next_bit(ecc->edma_unused, + channel = find_next_bit(ecc->channel_unused, ecc->num_channels, channel); if (channel == ecc->num_channels) break; - if (!test_and_set_bit(channel, ecc->edma_inuse)) { + if (!test_and_set_bit(channel, ecc->slot_inuse)) { done = 1; break; } @@ -849,7 +849,7 @@ static int edma_alloc_channel(struct edma_cc *ecc, int channel, return -ENOMEM; } else if (channel >= ecc->num_channels) { return -EINVAL; - } else if (test_and_set_bit(channel, ecc->edma_inuse)) { + } else if (test_and_set_bit(channel, ecc->slot_inuse)) { return -EBUSY; } @@ -895,7 +895,7 @@ static void edma_free_channel(struct edma_cc *ecc, unsigned channel) /* REVISIT should probably take out of shadow region 0 */ edma_write_slot(ecc, channel, &dummy_paramset); - clear_bit(channel, ecc->edma_inuse); + clear_bit(channel, ecc->slot_inuse); } /* Move channel to a specific event queue */ @@ -2137,14 +2137,15 @@ static int edma_probe(struct platform_device *pdev) if (!ecc->slave_chans) return -ENOMEM; - ecc->edma_unused = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_channels), - sizeof(unsigned long), GFP_KERNEL); - if (!ecc->edma_unused) + ecc->channel_unused = devm_kcalloc(dev, + BITS_TO_LONGS(ecc->num_channels), + sizeof(unsigned long), GFP_KERNEL); + if (!ecc->channel_unused) return -ENOMEM; - ecc->edma_inuse = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_slots), + ecc->slot_inuse = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_slots), sizeof(unsigned long), GFP_KERNEL); - if (!ecc->edma_inuse) + if (!ecc->slot_inuse) return -ENOMEM; ecc->default_queue = info->default_queue; @@ -2153,7 +2154,7 @@ static int edma_probe(struct platform_device *pdev) edma_write_slot(ecc, i, &dummy_paramset); /* Mark all channels as unused */ - memset(ecc->edma_unused, 0xff, sizeof(ecc->edma_unused)); + memset(ecc->channel_unused, 0xff, sizeof(ecc->channel_unused)); if (info->rsv) { /* Clear the reserved channels in unused list */ @@ -2162,7 +2163,7 @@ static int edma_probe(struct platform_device *pdev) for (i = 0; rsv_chans[i][0] != -1; i++) { off = rsv_chans[i][0]; ln = rsv_chans[i][1]; - clear_bits(off, ln, ecc->edma_unused); + clear_bits(off, ln, ecc->channel_unused); } } @@ -2172,7 +2173,7 @@ static int edma_probe(struct platform_device *pdev) for (i = 0; rsv_slots[i][0] != -1; i++) { off = rsv_slots[i][0]; ln = rsv_slots[i][1]; - set_bits(off, ln, ecc->edma_inuse); + set_bits(off, ln, ecc->slot_inuse); } } } @@ -2182,7 +2183,7 @@ static int edma_probe(struct platform_device *pdev) if (xbar_chans) { for (i = 0; xbar_chans[i][1] != -1; i++) { off = xbar_chans[i][1]; - clear_bits(off, 1, ecc->edma_unused); + clear_bits(off, 1, ecc->channel_unused); } } @@ -2301,7 +2302,7 @@ static int edma_pm_resume(struct device *dev) edma_direct_dmach_to_param_mapping(ecc); for (i = 0; i < ecc->num_channels; i++) { - if (test_bit(i, ecc->edma_inuse)) { + if (test_bit(i, ecc->slot_inuse)) { /* ensure access through shadow region 0 */ edma_or_array2(ecc, EDMA_DRAE, 0, i >> 5, BIT(i & 0x1f)); -- cgit v1.2.3