From e09b41010ba33a20a87472ee821fa407a5b8da36 Mon Sep 17 00:00:00 2001 From: José Pekkarinen Date: Mon, 11 Apr 2016 10:41:07 +0300 Subject: These changes are the raw update to linux-4.4.6-rt14. Kernel sources are taken from kernel.org, and rt patch from the rt wiki download page. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen --- kernel/drivers/dma/hsu/Kconfig | 9 ++---- kernel/drivers/dma/hsu/hsu.c | 63 ++++++++---------------------------------- kernel/drivers/dma/hsu/hsu.h | 2 +- kernel/drivers/dma/hsu/pci.c | 2 +- 4 files changed, 15 insertions(+), 61 deletions(-) (limited to 'kernel/drivers/dma/hsu') diff --git a/kernel/drivers/dma/hsu/Kconfig b/kernel/drivers/dma/hsu/Kconfig index 2810dca70..c70841731 100644 --- a/kernel/drivers/dma/hsu/Kconfig +++ b/kernel/drivers/dma/hsu/Kconfig @@ -5,10 +5,5 @@ config HSU_DMA select DMA_VIRTUAL_CHANNELS config HSU_DMA_PCI - tristate "High Speed UART DMA PCI driver" - depends on PCI - select HSU_DMA - help - Support the High Speed UART DMA on the platfroms that - enumerate it as a PCI device. For example, Intel Medfield - has integrated this HSU DMA controller. + tristate + depends on HSU_DMA && PCI diff --git a/kernel/drivers/dma/hsu/hsu.c b/kernel/drivers/dma/hsu/hsu.c index f42f71e37..823ad728a 100644 --- a/kernel/drivers/dma/hsu/hsu.c +++ b/kernel/drivers/dma/hsu/hsu.c @@ -99,21 +99,13 @@ static void hsu_dma_chan_start(struct hsu_dma_chan *hsuc) static void hsu_dma_stop_channel(struct hsu_dma_chan *hsuc) { - unsigned long flags; - - spin_lock_irqsave(&hsuc->lock, flags); hsu_chan_disable(hsuc); hsu_chan_writel(hsuc, HSU_CH_DCR, 0); - spin_unlock_irqrestore(&hsuc->lock, flags); } static void hsu_dma_start_channel(struct hsu_dma_chan *hsuc) { - unsigned long flags; - - spin_lock_irqsave(&hsuc->lock, flags); hsu_dma_chan_start(hsuc); - spin_unlock_irqrestore(&hsuc->lock, flags); } static void hsu_dma_start_transfer(struct hsu_dma_chan *hsuc) @@ -139,9 +131,9 @@ static u32 hsu_dma_chan_get_sr(struct hsu_dma_chan *hsuc) unsigned long flags; u32 sr; - spin_lock_irqsave(&hsuc->lock, flags); + spin_lock_irqsave(&hsuc->vchan.lock, flags); sr = hsu_chan_readl(hsuc, HSU_CH_SR); - spin_unlock_irqrestore(&hsuc->lock, flags); + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); return sr; } @@ -154,7 +146,7 @@ irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr) u32 sr; /* Sanity check */ - if (nr >= chip->pdata->nr_channels) + if (nr >= chip->hsu->nr_channels) return IRQ_NONE; hsuc = &chip->hsu->chan[nr]; @@ -273,14 +265,11 @@ static size_t hsu_dma_active_desc_size(struct hsu_dma_chan *hsuc) struct hsu_dma_desc *desc = hsuc->desc; size_t bytes = hsu_dma_desc_size(desc); int i; - unsigned long flags; - spin_lock_irqsave(&hsuc->lock, flags); i = desc->active % HSU_DMA_CHAN_NR_DESC; do { bytes += hsu_chan_readl(hsuc, HSU_CH_DxTSR(i)); } while (--i >= 0); - spin_unlock_irqrestore(&hsuc->lock, flags); return bytes; } @@ -327,24 +316,6 @@ static int hsu_dma_slave_config(struct dma_chan *chan, return 0; } -static void hsu_dma_chan_deactivate(struct hsu_dma_chan *hsuc) -{ - unsigned long flags; - - spin_lock_irqsave(&hsuc->lock, flags); - hsu_chan_disable(hsuc); - spin_unlock_irqrestore(&hsuc->lock, flags); -} - -static void hsu_dma_chan_activate(struct hsu_dma_chan *hsuc) -{ - unsigned long flags; - - spin_lock_irqsave(&hsuc->lock, flags); - hsu_chan_enable(hsuc); - spin_unlock_irqrestore(&hsuc->lock, flags); -} - static int hsu_dma_pause(struct dma_chan *chan) { struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); @@ -352,7 +323,7 @@ static int hsu_dma_pause(struct dma_chan *chan) spin_lock_irqsave(&hsuc->vchan.lock, flags); if (hsuc->desc && hsuc->desc->status == DMA_IN_PROGRESS) { - hsu_dma_chan_deactivate(hsuc); + hsu_chan_disable(hsuc); hsuc->desc->status = DMA_PAUSED; } spin_unlock_irqrestore(&hsuc->vchan.lock, flags); @@ -368,7 +339,7 @@ static int hsu_dma_resume(struct dma_chan *chan) spin_lock_irqsave(&hsuc->vchan.lock, flags); if (hsuc->desc && hsuc->desc->status == DMA_PAUSED) { hsuc->desc->status = DMA_IN_PROGRESS; - hsu_dma_chan_activate(hsuc); + hsu_chan_enable(hsuc); } spin_unlock_irqrestore(&hsuc->vchan.lock, flags); @@ -404,7 +375,6 @@ static void hsu_dma_free_chan_resources(struct dma_chan *chan) int hsu_dma_probe(struct hsu_dma_chip *chip) { struct hsu_dma *hsu; - struct hsu_dma_platform_data *pdata = chip->pdata; void __iomem *addr = chip->regs + chip->offset; unsigned short i; int ret; @@ -415,25 +385,16 @@ int hsu_dma_probe(struct hsu_dma_chip *chip) chip->hsu = hsu; - if (!pdata) { - pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL); - if (!pdata) - return -ENOMEM; - - chip->pdata = pdata; + /* Calculate nr_channels from the IO space length */ + hsu->nr_channels = (chip->length - chip->offset) / HSU_DMA_CHAN_LENGTH; - /* Guess nr_channels from the IO space length */ - pdata->nr_channels = (chip->length - chip->offset) / - HSU_DMA_CHAN_LENGTH; - } - - hsu->chan = devm_kcalloc(chip->dev, pdata->nr_channels, + hsu->chan = devm_kcalloc(chip->dev, hsu->nr_channels, sizeof(*hsu->chan), GFP_KERNEL); if (!hsu->chan) return -ENOMEM; INIT_LIST_HEAD(&hsu->dma.channels); - for (i = 0; i < pdata->nr_channels; i++) { + for (i = 0; i < hsu->nr_channels; i++) { struct hsu_dma_chan *hsuc = &hsu->chan[i]; hsuc->vchan.desc_free = hsu_dma_desc_free; @@ -441,8 +402,6 @@ int hsu_dma_probe(struct hsu_dma_chip *chip) hsuc->direction = (i & 0x1) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; hsuc->reg = addr + i * HSU_DMA_CHAN_LENGTH; - - spin_lock_init(&hsuc->lock); } dma_cap_set(DMA_SLAVE, hsu->dma.cap_mask); @@ -471,7 +430,7 @@ int hsu_dma_probe(struct hsu_dma_chip *chip) if (ret) return ret; - dev_info(chip->dev, "Found HSU DMA, %d channels\n", pdata->nr_channels); + dev_info(chip->dev, "Found HSU DMA, %d channels\n", hsu->nr_channels); return 0; } EXPORT_SYMBOL_GPL(hsu_dma_probe); @@ -483,7 +442,7 @@ int hsu_dma_remove(struct hsu_dma_chip *chip) dma_async_device_unregister(&hsu->dma); - for (i = 0; i < chip->pdata->nr_channels; i++) { + for (i = 0; i < hsu->nr_channels; i++) { struct hsu_dma_chan *hsuc = &hsu->chan[i]; tasklet_kill(&hsuc->vchan.task); diff --git a/kernel/drivers/dma/hsu/hsu.h b/kernel/drivers/dma/hsu/hsu.h index 0275233cf..f06579c6d 100644 --- a/kernel/drivers/dma/hsu/hsu.h +++ b/kernel/drivers/dma/hsu/hsu.h @@ -78,7 +78,6 @@ struct hsu_dma_chan { struct virt_dma_chan vchan; void __iomem *reg; - spinlock_t lock; /* hardware configuration */ enum dma_transfer_direction direction; @@ -108,6 +107,7 @@ struct hsu_dma { /* channels */ struct hsu_dma_chan *chan; + unsigned short nr_channels; }; static inline struct hsu_dma *to_hsu_dma(struct dma_device *ddev) diff --git a/kernel/drivers/dma/hsu/pci.c b/kernel/drivers/dma/hsu/pci.c index 77879e6dd..e2db76bd5 100644 --- a/kernel/drivers/dma/hsu/pci.c +++ b/kernel/drivers/dma/hsu/pci.c @@ -31,7 +31,7 @@ static irqreturn_t hsu_pci_irq(int irq, void *dev) irqreturn_t ret = IRQ_NONE; dmaisr = readl(chip->regs + HSU_PCI_DMAISR); - for (i = 0; i < chip->pdata->nr_channels; i++) { + for (i = 0; i < chip->hsu->nr_channels; i++) { if (dmaisr & 0x1) ret |= hsu_dma_irq(chip, i); dmaisr >>= 1; -- cgit 1.2.3-korg