diff options
author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2013-04-23 01:33:22 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-23 17:41:38 (GMT) |
commit | 0a8fc08910cfec7713801b7097e9a31c960339b8 (patch) | |
tree | 14e26bb698161d1496dbe27e4182268a063af1f0 /drivers/staging | |
parent | fe9b0850ab8f6f5a91a170cca07d24a2afb4ceb9 (diff) | |
download | linux-fsl-qoriq-0a8fc08910cfec7713801b7097e9a31c960339b8.tar.xz |
staging: comedi: das800: introduce das800_ind_{write, read}()
The GAS800_GAIN register contains some bits that enable indirect
writing to additional registers on the board through iobase + 2
and indirect reading of addition registers through iobase + 7.
Introduce some helper functions to handle the indirect register
write/read.
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>
Diffstat (limited to 'drivers/staging')
-rw-r--r-- | drivers/staging/comedi/drivers/das800.c | 62 |
1 files changed, 39 insertions, 23 deletions
diff --git a/drivers/staging/comedi/drivers/das800.c b/drivers/staging/comedi/drivers/das800.c index 18e2ac0..bc8a23e 100644 --- a/drivers/staging/comedi/drivers/das800.c +++ b/drivers/staging/comedi/drivers/das800.c @@ -228,6 +228,27 @@ struct das800_private { volatile int do_bits; /* digital output bits */ }; +static void das800_ind_write(struct comedi_device *dev, + unsigned val, unsigned reg) +{ + /* + * Select dev->iobase + 2 to be desired register + * then write to that register. + */ + outb(reg, dev->iobase + DAS800_GAIN); + outb(val, dev->iobase + 2); +} + +static unsigned das800_ind_read(struct comedi_device *dev, unsigned reg) +{ + /* + * Select dev->iobase + 7 to be desired register + * then read from that register. + */ + outb(reg, dev->iobase + DAS800_GAIN); + return inb(dev->iobase + 7); +} + /* enable_das800 makes the card start taking hardware triggered conversions */ static void enable_das800(struct comedi_device *dev) { @@ -239,10 +260,10 @@ static void enable_das800(struct comedi_device *dev) /* enable fifo-half full interrupts for cio-das802/16 */ if (thisboard->resolution == 16) outb(CIO_ENHF, dev->iobase + DAS800_GAIN); - outb(CONV_CONTROL, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be conversion control register */ - outb(CONV_HCEN, dev->iobase + DAS800_CONV_CONTROL); /* enable hardware triggering */ - outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ - outb(CONTROL1_INTE | devpriv->do_bits, dev->iobase + DAS800_CONTROL1); /* enable card's interrupt */ + /* enable hardware triggering */ + das800_ind_write(dev, CONV_HCEN, CONV_CONTROL); + /* enable card's interrupt */ + das800_ind_write(dev, CONTROL1_INTE | devpriv->do_bits, CONTROL1); spin_unlock_irqrestore(&dev->spinlock, irq_flags); } @@ -250,9 +271,10 @@ static void enable_das800(struct comedi_device *dev) static void disable_das800(struct comedi_device *dev) { unsigned long irq_flags; + spin_lock_irqsave(&dev->spinlock, irq_flags); - outb(CONV_CONTROL, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be conversion control register */ - outb(0x0, dev->iobase + DAS800_CONV_CONTROL); /* disable hardware triggering of conversions */ + /* disable hardware triggering of conversions */ + das800_ind_write(dev, 0x0, CONV_CONTROL); spin_unlock_irqrestore(&dev->spinlock, irq_flags); } @@ -398,8 +420,8 @@ static int das800_ai_do_cmd(struct comedi_device *dev, scan = (endChan << 3) | startChan; spin_lock_irqsave(&dev->spinlock, irq_flags); - outb(SCAN_LIMITS, dev->iobase + DAS800_GAIN); /* select base address + 2 to be scan limits register */ - outb(scan, dev->iobase + DAS800_SCAN_LIMITS); /* set scan limits */ + /* set scan limits */ + das800_ind_write(dev, scan, SCAN_LIMITS); spin_unlock_irqrestore(&dev->spinlock, irq_flags); /* set gain */ @@ -450,9 +472,9 @@ static int das800_ai_do_cmd(struct comedi_device *dev, } spin_lock_irqsave(&dev->spinlock, irq_flags); - outb(CONV_CONTROL, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be conversion control register */ - outb(conv_bits, dev->iobase + DAS800_CONV_CONTROL); + das800_ind_write(dev, conv_bits, CONV_CONTROL); spin_unlock_irqrestore(&dev->spinlock, irq_flags); + async->events = 0; enable_das800(dev); return 0; @@ -488,8 +510,7 @@ static irqreturn_t das800_interrupt(int irq, void *d) /* if hardware conversions are not enabled, then quit */ spin_lock_irqsave(&dev->spinlock, irq_flags); - outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select base address + 7 to be STATUS2 register */ - status = inb(dev->iobase + DAS800_STATUS2) & STATUS2_HCEN; + status = das800_ind_read(dev, CONTROL1) & STATUS2_HCEN; /* don't release spinlock yet since we want to make sure no one else disables hardware conversions */ if (status == 0) { spin_unlock_irqrestore(&dev->spinlock, irq_flags); @@ -542,9 +563,8 @@ static irqreturn_t das800_interrupt(int irq, void *d) if (devpriv->count > 0 || devpriv->forever == 1) { /* Re-enable card's interrupt. * We already have spinlock, so indirect addressing is safe */ - outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ - outb(CONTROL1_INTE | devpriv->do_bits, - dev->iobase + DAS800_CONTROL1); + das800_ind_write(dev, CONTROL1_INTE | devpriv->do_bits, + CONTROL1); spin_unlock_irqrestore(&dev->spinlock, irq_flags); /* otherwise, stop taking data */ } else { @@ -576,8 +596,7 @@ static int das800_ai_rinsn(struct comedi_device *dev, chan = CR_CHAN(insn->chanspec); spin_lock_irqsave(&dev->spinlock, irq_flags); - outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ - outb(chan | devpriv->do_bits, dev->iobase + DAS800_CONTROL1); + das800_ind_write(dev, chan | devpriv->do_bits, CONTROL1); spin_unlock_irqrestore(&dev->spinlock, irq_flags); /* set gain / range */ @@ -644,8 +663,7 @@ static int das800_do_wbits(struct comedi_device *dev, devpriv->do_bits = wbits << 4; spin_lock_irqsave(&dev->spinlock, irq_flags); - outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ - outb(devpriv->do_bits | CONTROL1_INTE, dev->iobase + DAS800_CONTROL1); + das800_ind_write(dev, CONTROL1_INTE | devpriv->do_bits, CONTROL1); spin_unlock_irqrestore(&dev->spinlock, irq_flags); data[1] = wbits; @@ -661,8 +679,7 @@ static int das800_probe(struct comedi_device *dev) int board; spin_lock_irqsave(&dev->spinlock, irq_flags); - outb(ID, dev->iobase + DAS800_GAIN); - id_bits = inb(dev->iobase + DAS800_ID) & 0x3; + id_bits = das800_ind_read(dev, ID) & 0x3; spin_unlock_irqrestore(&dev->spinlock, irq_flags); board = thisboard - das800_boards; @@ -801,8 +818,7 @@ static int das800_attach(struct comedi_device *dev, struct comedi_devconfig *it) /* initialize digital out channels */ spin_lock_irqsave(&dev->spinlock, irq_flags); - outb(CONTROL1, dev->iobase + DAS800_GAIN); /* select dev->iobase + 2 to be control register 1 */ - outb(CONTROL1_INTE | devpriv->do_bits, dev->iobase + DAS800_CONTROL1); + das800_ind_write(dev, CONTROL1_INTE | devpriv->do_bits, CONTROL1); spin_unlock_irqrestore(&dev->spinlock, irq_flags); return 0; |