On 20/02/15 23:05, H Hartley Sweeten wrote:
Convert this driver to use the comedi_8254 module to provide the 8254 timer
support.
Add 'clock_src' and 'gate_src' members to the comedi_8254 data for convienence.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/Kconfig | 1 +
.../staging/comedi/drivers/amplc_dio200_common.c | 263 ++++++---------------
drivers/staging/comedi/drivers/comedi_8254.h | 4 +
3 files changed, 72 insertions(+), 196 deletions(-)
[snip]
+static int dio200_subdev_8254_offset(struct comedi_device *dev,
+ struct comedi_subdevice *s)
{
- const struct dio200_board *board = dev->board_ptr;
- struct dio200_subdev_8254 *subpriv = s->private;
+ struct comedi_8254 *i8254 = s->private;
- if (!board->has_clk_gat_sce)
- return -1;
+ if (dev->mmio)
+ return i8254->mmio - dev->mmio;
- return subpriv->gate_src[counter_number];
+ return i8254->iobase - dev->iobase;
}
This will be wrong for the PCIe boards (board->is_pcie), where the
registers are on 8-byte boundaries (regshift 3) instead of 1-byte
boundaries (regshift 0). The result needs to be shifted right by 3 for
the PCIe boards. The "offset" should be more of a "logical offset" as
if the registers where on 1-byte boundaries. I.e. it's the "logical
offset" that determines which clock and gate selection registers to use
(and the 'which' bit setting within the register values).
[snip]
static int dio200_subdev_8254_init(struct comedi_device *dev,
@@ -686,28 +551,34 @@ static int dio200_subdev_8254_init(struct comedi_device
*dev,
unsigned int offset)
{
const struct dio200_board *board = dev->board_ptr;
- struct dio200_subdev_8254 *subpriv;
- unsigned int chan;
+ struct comedi_8254 *i8254;
+ unsigned int regshift;
+ int chan;
- subpriv = comedi_alloc_spriv(s, sizeof(*subpriv));
- if (!subpriv)
+ regshift = (board->is_pcie) ? 3 : 0;
+
+ if (dev->mmio)
+ i8254 = comedi_8254_mm_init(dev->mmio + offset,
+ 0, I8254_IO8, regshift);
+ else
+ i8254 = comedi_8254_init(dev->iobase + offset,
+ 0, I8254_IO8, regshift);
The offsets to the 8254 will need to be shifted left by regshift, since
the comedi_8254 module is reading and writing the registers itself
rather than going through dio200_read8() and dio200_write8() which was
previously responsible for the left shift.
--
-=( Ian Abbott @ MEV Ltd. E-mail: <abbo...@mev.co.uk> )=-
-=( Web: http://www.mev.co.uk/ )=-
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