From f3df482a0cf410a17b306f6b4437ab102c4085e0 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 14 Jan 2015 10:05:05 -0700 Subject: [PATCH] staging: comedi: pcl812: remove depends on ISA_DMA_API limitation Use the new comedi_isadma module to provide the ISA DMA support. This removes all the ISA_DMA_API code from this driver and allows the driver to be used on platforms that don't support the ISA_DMA_API. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/Kconfig | 2 +- drivers/staging/comedi/drivers/pcl812.c | 199 ++++++++---------------- 2 files changed, 69 insertions(+), 132 deletions(-) diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig index 1ed797b79aaa..1b8c690d99b5 100644 --- a/drivers/staging/comedi/Kconfig +++ b/drivers/staging/comedi/Kconfig @@ -168,7 +168,7 @@ config COMEDI_PCL730 config COMEDI_PCL812 tristate "Advantech PCL-812/813 and ADlink ACL-8112/8113/8113/8216" - depends on ISA_DMA_API + select COMEDI_ISADMA if ISA_DMA_API ---help--- Enable support for Advantech PCL-812/PG, PCL-813/B, ADLink ACL-8112DG/HG/PG, ACL-8113, ACL-8216, ICP DAS A-821PGH/PGL/PGL-NDA, diff --git a/drivers/staging/comedi/drivers/pcl812.c b/drivers/staging/comedi/drivers/pcl812.c index c67c2c70c0de..134b26e16149 100644 --- a/drivers/staging/comedi/drivers/pcl812.c +++ b/drivers/staging/comedi/drivers/pcl812.c @@ -111,12 +111,12 @@ #include #include #include -#include "../comedidev.h" - #include #include -#include +#include "../comedidev.h" + +#include "comedi_isadma.h" #include "comedi_fc.h" #include "8253.h" @@ -506,21 +506,12 @@ static const struct pcl812_board boardtypes[] = { }, }; -struct pcl812_dma_desc { - void *virt_addr; /* virtual address of DMA buffer */ - dma_addr_t hw_addr; /* hardware (bus) address of DMA buffer */ - unsigned int size; /* transfer size (in bytes) */ -}; - struct pcl812_private { - unsigned char dma; /* >0 use dma ( usedDMA channel) */ + struct comedi_isadma *dma; unsigned char range_correction; /* =1 we must add 1 to range number */ unsigned int last_ai_chanspec; unsigned char mode_reg_int; /* there is stored INT number for some card */ unsigned int ai_poll_ptr; /* how many sampes transfer poll */ - unsigned int hwdmasize; - struct pcl812_dma_desc dma_desc[2]; - int cur_dma; unsigned int dma_runs_to_end; /* how many times we must switch DMA buffers */ unsigned int last_dma_run; /* how many bytes to transfer on last DMA buffer */ unsigned int max_812_ai_mode0_rangewait; /* setling time for gain */ @@ -533,29 +524,6 @@ struct pcl812_private { unsigned int ai_eos:1; }; -static void pcl812_isadma_program(unsigned int dma_chan, - struct pcl812_dma_desc *dma) -{ - unsigned long flags; - - flags = claim_dma_lock(); - clear_dma_ff(dma_chan); - set_dma_mode(dma_chan, DMA_MODE_READ); - set_dma_addr(dma_chan, dma->hw_addr); - set_dma_count(dma_chan, dma->size); - enable_dma(dma_chan); - release_dma_lock(flags); -} - -static void pcl812_isadma_disable(unsigned int dma_chan) -{ - unsigned long flags; - - flags = claim_dma_lock(); - disable_dma(dma_chan); - release_dma_lock(flags); -} - static void pcl812_start_pacer(struct comedi_device *dev, bool load_timers) { struct pcl812_private *devpriv = dev->private; @@ -575,23 +543,24 @@ static void pcl812_ai_setup_dma(struct comedi_device *dev, struct comedi_subdevice *s) { struct pcl812_private *devpriv = dev->private; - struct pcl812_dma_desc *dma0 = &devpriv->dma_desc[0]; - struct pcl812_dma_desc *dma1 = &devpriv->dma_desc[1]; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc0 = &dma->desc[0]; + struct comedi_isadma_desc *desc1 = &dma->desc[1]; struct comedi_cmd *cmd = &s->async->cmd; unsigned int bytes; /* we use EOS, so adapt DMA buffer to one scan */ if (devpriv->ai_eos) { - dma0->size = comedi_bytes_per_scan(s); - dma1->size = comedi_bytes_per_scan(s); + desc0->size = comedi_bytes_per_scan(s); + desc1->size = comedi_bytes_per_scan(s); devpriv->dma_runs_to_end = 1; } else { - dma0->size = devpriv->hwdmasize; - dma1->size = devpriv->hwdmasize; - if (s->async->prealloc_bufsz < devpriv->hwdmasize) { - dma0->size = s->async->prealloc_bufsz; - dma1->size = s->async->prealloc_bufsz; - } + desc0->size = desc0->maxsize; + desc1->size = desc1->maxsize; + if (s->async->prealloc_bufsz < desc0->maxsize) + desc0->size = s->async->prealloc_bufsz; + if (s->async->prealloc_bufsz < desc1->maxsize) + desc1->size = s->async->prealloc_bufsz; if (cmd->stop_src == TRIG_NONE) { devpriv->dma_runs_to_end = 1; } else { @@ -599,46 +568,47 @@ static void pcl812_ai_setup_dma(struct comedi_device *dev, bytes = cmd->stop_arg * comedi_bytes_per_scan(s); /* how many DMA pages we must fill */ - devpriv->dma_runs_to_end = bytes / dma0->size; + devpriv->dma_runs_to_end = bytes / desc0->size; /* on last dma transfer must be moved */ - devpriv->last_dma_run = bytes % dma0->size; + devpriv->last_dma_run = bytes % desc0->size; if (devpriv->dma_runs_to_end == 0) - dma0->size = devpriv->last_dma_run; + desc0->size = devpriv->last_dma_run; devpriv->dma_runs_to_end--; } } - if (dma0->size > devpriv->hwdmasize) { - dma0->size = devpriv->hwdmasize; + if (desc0->size > desc0->maxsize) { + desc0->size = desc0->maxsize; devpriv->ai_eos = 0; } - if (dma1->size > devpriv->hwdmasize) { - dma1->size = devpriv->hwdmasize; + if (desc1->size > desc1->maxsize) { + desc1->size = desc1->maxsize; devpriv->ai_eos = 0; } - devpriv->cur_dma = 0; + dma->cur_dma = 0; - pcl812_isadma_program(devpriv->dma, dma0); + comedi_isadma_program(desc0); } static void pcl812_ai_setup_next_dma(struct comedi_device *dev, struct comedi_subdevice *s) { struct pcl812_private *devpriv = dev->private; - struct pcl812_dma_desc *dma; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc; - pcl812_isadma_disable(devpriv->dma); + comedi_isadma_disable(dma->chan); + dma->cur_dma = 1 - dma->cur_dma; - devpriv->cur_dma = 1 - devpriv->cur_dma; - dma = &devpriv->dma_desc[devpriv->cur_dma]; + desc = &dma->desc[dma->cur_dma]; if (!devpriv->ai_eos) { if (devpriv->dma_runs_to_end) devpriv->dma_runs_to_end--; else - dma->size = devpriv->last_dma_run; + desc->size = devpriv->last_dma_run; } - pcl812_isadma_program(devpriv->dma, dma); + comedi_isadma_program(desc); } static void pcl812_ai_set_chan_range(struct comedi_device *dev, @@ -904,17 +874,19 @@ static void pcl812_handle_dma(struct comedi_device *dev, struct comedi_subdevice *s) { struct pcl812_private *devpriv = dev->private; - struct pcl812_dma_desc *dma = &devpriv->dma_desc[devpriv->cur_dma]; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma]; unsigned int nsamples; int bufptr; pcl812_ai_setup_next_dma(dev, s); - nsamples = comedi_bytes_to_samples(s, dma->size) - devpriv->ai_poll_ptr; + nsamples = comedi_bytes_to_samples(s, desc->size) - + devpriv->ai_poll_ptr; bufptr = devpriv->ai_poll_ptr; devpriv->ai_poll_ptr = 0; - transfer_from_dma_buf(dev, s, dma->virt_addr, bufptr, nsamples); + transfer_from_dma_buf(dev, s, desc->virt_addr, bufptr, nsamples); } static irqreturn_t pcl812_interrupt(int irq, void *d) @@ -942,45 +914,37 @@ static irqreturn_t pcl812_interrupt(int irq, void *d) static int pcl812_ai_poll(struct comedi_device *dev, struct comedi_subdevice *s) { struct pcl812_private *devpriv = dev->private; - struct pcl812_dma_desc *dma; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc; unsigned long flags; - unsigned int top1, top2, i; + unsigned int poll; + int ret; + /* poll is valid only for DMA transfer */ if (!devpriv->ai_dma) - return 0; /* poll is valid only for DMA transfer */ + return 0; spin_lock_irqsave(&dev->spinlock, flags); - for (i = 0; i < 10; i++) { - /* where is now DMA */ - top1 = get_dma_residue(devpriv->ai_dma); - top2 = get_dma_residue(devpriv->ai_dma); - if (top1 == top2) - break; - } - - if (top1 != top2) { - spin_unlock_irqrestore(&dev->spinlock, flags); - return 0; - } - /* where is now DMA in buffer */ - dma = &devpriv->dma_desc[1 - devpriv->cur_dma]; - top1 = dma->size - top1; - top1 >>= 1; /* sample position */ - top2 = top1 - devpriv->ai_poll_ptr; - if (top2 < 1) { /* no new samples */ - spin_unlock_irqrestore(&dev->spinlock, flags); - return 0; + poll = comedi_isadma_poll(dma); + poll = comedi_bytes_to_samples(s, poll); + if (poll > devpriv->ai_poll_ptr) { + desc = &dma->desc[dma->cur_dma]; + transfer_from_dma_buf(dev, s, desc->virt_addr, + devpriv->ai_poll_ptr, + poll - devpriv->ai_poll_ptr); + /* new buffer position */ + devpriv->ai_poll_ptr = poll; + + ret = comedi_buf_n_bytes_ready(s); + } else { + /* no new samples */ + ret = 0; } - transfer_from_dma_buf(dev, s, dma->virt_addr, - devpriv->ai_poll_ptr, top2); - - devpriv->ai_poll_ptr = top1; /* new buffer position */ - spin_unlock_irqrestore(&dev->spinlock, flags); - return comedi_buf_n_bytes_ready(s); + return ret; } static int pcl812_ai_cancel(struct comedi_device *dev, @@ -989,7 +953,7 @@ static int pcl812_ai_cancel(struct comedi_device *dev, struct pcl812_private *devpriv = dev->private; if (devpriv->ai_dma) - pcl812_isadma_disable(devpriv->dma); + comedi_isadma_disable(devpriv->dma->chan); outb(devpriv->mode_reg_int | PCL812_CTRL_DISABLE_TRIG, dev->iobase + PCL812_CTRL_REG); @@ -1199,49 +1163,25 @@ static void pcl812_set_ai_range_table(struct comedi_device *dev, } } -static int pcl812_alloc_dma(struct comedi_device *dev, unsigned int dma_chan) +static void pcl812_alloc_dma(struct comedi_device *dev, unsigned int dma_chan) { struct pcl812_private *devpriv = dev->private; - struct pcl812_dma_desc *dma; - int i; + /* only DMA channels 3 and 1 are valid */ if (!(dma_chan == 3 || dma_chan == 1)) - return 0; - - if (request_dma(dma_chan, dev->board_name)) - return 0; - devpriv->dma = dma_chan; - - devpriv->hwdmasize = PAGE_SIZE * 2; /* we want 8KB */ - - for (i = 0; i < 2; i++) { - dma = &devpriv->dma_desc[i]; + return; - dma->virt_addr = dma_alloc_coherent(NULL, devpriv->hwdmasize, - &dma->hw_addr, GFP_KERNEL); - if (!dma->virt_addr) - return -ENOMEM; - } - return 0; + /* DMA uses two 8K buffers */ + devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan, + PAGE_SIZE * 2, COMEDI_ISADMA_READ); } static void pcl812_free_dma(struct comedi_device *dev) { struct pcl812_private *devpriv = dev->private; - struct pcl812_dma_desc *dma; - int i; - if (!devpriv) - return; - - for (i = 0; i < 2; i++) { - dma = &devpriv->dma_desc[i]; - if (dma->virt_addr) - dma_free_coherent(NULL, devpriv->hwdmasize, - dma->virt_addr, dma->hw_addr); - } - if (devpriv->dma) - free_dma(devpriv->dma); + if (devpriv) + comedi_isadma_free(devpriv->dma); } static int pcl812_attach(struct comedi_device *dev, struct comedi_devconfig *it) @@ -1269,11 +1209,8 @@ static int pcl812_attach(struct comedi_device *dev, struct comedi_devconfig *it) } /* we need an IRQ to do DMA on channel 3 or 1 */ - if (dev->irq && board->has_dma) { - ret = pcl812_alloc_dma(dev, it->options[2]); - if (ret) - return ret; - } + if (dev->irq && board->has_dma) + pcl812_alloc_dma(dev, it->options[2]); /* differential analog inputs? */ switch (board->board_type) { -- 2.20.1