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staging: comedi: adl_pci9118: introduce struct pci9118_dmabuf

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For aesthetics, wrap the DMA buffer information in a struct.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2014-09-09 13:05:38 -07:00 committed by Greg Kroah-Hartman
parent 231649a475
commit 1f2cbe2c5b
1 changed files with 48 additions and 48 deletions
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96
drivers/staging/comedi/drivers/adl_pci9118.c
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@ -204,6 +204,14 @@ static const struct pci9118_boardinfo pci9118_boards[] = {
},
};
struct pci9118_dmabuf {
unsigned short *virt; /* virtual address of buffer */
unsigned long hw; /* hardware (bus) address of buffer */
unsigned int size; /* size of dma buffer in bytes */
unsigned int use_size; /* which size we may now use for transfer */
int pages; /* number of pages in buffer */
};
struct pci9118_private {
unsigned long iobase_a; /* base+size for AMCC chip */
unsigned int master:1;
@ -239,19 +247,7 @@ struct pci9118_private {
* on external start
*/
unsigned int dma_actbuf; /* which buffer is used now */
unsigned short *dmabuf_virt[2]; /*
* pointers to begin of
* DMA buffer
*/
unsigned long dmabuf_hw[2]; /* hw address of DMA buff */
unsigned int dmabuf_size[2]; /*
* size of dma buffer in bytes
*/
unsigned int dmabuf_use_size[2]; /*
* which size we may now use
* for transfer
*/
int dmabuf_pages[2]; /* number of pages in buffer */
struct pci9118_dmabuf dmabuf[2];
unsigned char exttrg_users; /*
* bit field of external trigger
* users(0-AI, 1-AO, 2-DI, 3-DO)
@ -274,11 +270,11 @@ struct pci9118_private {
static void pci9118_amcc_setup_dma(struct comedi_device *dev, unsigned int buf)
{
struct pci9118_private *devpriv = dev->private;
struct pci9118_dmabuf *dmabuf = &devpriv->dmabuf[buf];
/* set the master write address and transfer count */
outl(devpriv->dmabuf_hw[buf], devpriv->iobase_a + AMCC_OP_REG_MWAR);
outl(devpriv->dmabuf_use_size[buf],
devpriv->iobase_a + AMCC_OP_REG_MWTC);
outl(dmabuf->hw, devpriv->iobase_a + AMCC_OP_REG_MWAR);
outl(dmabuf->use_size, devpriv->iobase_a + AMCC_OP_REG_MWTC);
}
static void pci9118_amcc_dma_ena(struct comedi_device *dev, bool enable)
@ -456,13 +452,15 @@ static int setup_channel_list(struct comedi_device *dev,
static void interrupt_pci9118_ai_mode4_switch(struct comedi_device *dev)
{
struct pci9118_private *devpriv = dev->private;
struct pci9118_dmabuf *dmabuf;
dmabuf = &devpriv->dmabuf[1 - devpriv->dma_actbuf];
devpriv->ai_cfg = PCI9118_AI_CFG_PDTRG | PCI9118_AI_CFG_PETRG |
PCI9118_AI_CFG_AM;
outl(devpriv->ai_cfg, dev->iobase + PCI9118_AI_CFG_REG);
pci9118_timer_set_mode(dev, 0, I8254_MODE0);
pci9118_timer_write(dev, 0,
devpriv->dmabuf_hw[1 - devpriv->dma_actbuf] >> 1);
pci9118_timer_write(dev, 0, dmabuf->hw >> 1);
devpriv->ai_cfg |= PCI9118_AI_CFG_START;
outl(devpriv->ai_cfg, dev->iobase + PCI9118_AI_CFG_REG);
}
@ -689,10 +687,10 @@ static void interrupt_pci9118_ai_dma(struct comedi_device *dev,
{
struct pci9118_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
struct pci9118_dmabuf *dmabuf = &devpriv->dmabuf[devpriv->dma_actbuf];
unsigned int next_dma_buf, samplesinbuf, sampls, m;
samplesinbuf = devpriv->dmabuf_use_size[devpriv->dma_actbuf] >> 1;
/* number of received real samples */
samplesinbuf = dmabuf->use_size >> 1; /* number of received samples */
if (devpriv->dma_doublebuf) { /*
* switch DMA buffers if is used
@ -708,9 +706,7 @@ static void interrupt_pci9118_ai_dma(struct comedi_device *dev,
/* how many samples is to end of buffer */
m = s->async->prealloc_bufsz >> 1;
sampls = m;
move_block_from_dma(dev, s,
devpriv->dmabuf_virt[devpriv->dma_actbuf],
samplesinbuf);
move_block_from_dma(dev, s, dmabuf->virt, samplesinbuf);
m = m - sampls; /* m=how many samples was transferred */
}
@ -1016,10 +1012,12 @@ static int Compute_and_setup_dma(struct comedi_device *dev,
{
struct pci9118_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
struct pci9118_dmabuf *dmabuf0 = &devpriv->dmabuf[0];
struct pci9118_dmabuf *dmabuf1 = &devpriv->dmabuf[1];
unsigned int dmalen0, dmalen1, i;
dmalen0 = devpriv->dmabuf_size[0];
dmalen1 = devpriv->dmabuf_size[1];
dmalen0 = dmabuf0->size;
dmalen1 = dmabuf1->size;
/* isn't output buff smaller that our DMA buff? */
if (dmalen0 > s->async->prealloc_bufsz) {
/* align to 32bit down */
@ -1115,8 +1113,8 @@ static int Compute_and_setup_dma(struct comedi_device *dev,
/* these DMA buffer size will be used */
devpriv->dma_actbuf = 0;
devpriv->dmabuf_use_size[0] = dmalen0;
devpriv->dmabuf_use_size[1] = dmalen1;
dmabuf0->use_size = dmalen0;
dmabuf1->use_size = dmalen1;
pci9118_amcc_dma_ena(dev, false);
pci9118_amcc_setup_dma(dev, 0);
@ -1184,6 +1182,7 @@ static int pci9118_ai_docmd_dma(struct comedi_device *dev,
{
struct pci9118_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
struct pci9118_dmabuf *dmabuf = &devpriv->dmabuf[0];
Compute_and_setup_dma(dev, s);
@ -1218,7 +1217,7 @@ static int pci9118_ai_docmd_dma(struct comedi_device *dev,
PCI9118_AI_CFG_AM;
outl(devpriv->ai_cfg, dev->iobase + PCI9118_AI_CFG_REG);
pci9118_timer_set_mode(dev, 0, I8254_MODE0);
pci9118_timer_write(dev, 0, devpriv->dmabuf_hw[0] >> 1);
pci9118_timer_write(dev, 0, dmabuf->hw >> 1);
devpriv->ai_cfg |= PCI9118_AI_CFG_START;
break;
default:
@ -1610,44 +1609,45 @@ static struct pci_dev *pci9118_find_pci(struct comedi_device *dev,
static void pci9118_alloc_dma(struct comedi_device *dev)
{
struct pci9118_private *devpriv = dev->private;
struct pci9118_dmabuf *dmabuf;
int pages;
int i;
for (i = 0; i < 2; i++) {
dmabuf = &devpriv->dmabuf[i];
for (pages = 4; pages >= 0; pages--) {
devpriv->dmabuf_virt[i] =
(unsigned short *)__get_free_pages(GFP_KERNEL,
pages);
if (devpriv->dmabuf_virt[i])
dmabuf->virt = (unsigned short *)
__get_free_pages(GFP_KERNEL, pages);
if (dmabuf->virt)
break;
}
if (devpriv->dmabuf_virt[i]) {
devpriv->dmabuf_pages[i] = pages;
devpriv->dmabuf_size[i] = PAGE_SIZE * pages;
devpriv->dmabuf_hw[i] = virt_to_bus((void *)
devpriv->dmabuf_virt[i]);
if (dmabuf->virt) {
dmabuf->pages = pages;
dmabuf->size = PAGE_SIZE * pages;
dmabuf->hw = virt_to_bus((void *)dmabuf->virt);
if (i == 0)
devpriv->master = 1;
if (i == 1)
devpriv->dma_doublebuf = 1;
}
}
if (devpriv->dmabuf_virt[0])
devpriv->master = 1;
if (devpriv->dmabuf_virt[1])
devpriv->dma_doublebuf = 1;
}
static void pci9118_free_dma(struct comedi_device *dev)
{
struct pci9118_private *devpriv = dev->private;
struct pci9118_dmabuf *dmabuf;
int i;
if (!devpriv)
return;
if (devpriv->dmabuf_virt[0])
free_pages((unsigned long)devpriv->dmabuf_virt[0],
devpriv->dmabuf_pages[0]);
if (devpriv->dmabuf_virt[1])
free_pages((unsigned long)devpriv->dmabuf_virt[1],
devpriv->dmabuf_pages[1]);
for (i = 0; i < 2; i++) {
dmabuf = &devpriv->dmabuf[i];
if (dmabuf->virt)
free_pages((unsigned long)dmabuf->virt, dmabuf->pages);
}
}
static int pci9118_common_attach(struct comedi_device *dev,