From 18cbf973a9a77e0b6128d4c187f337f4dc94df90 Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Wed, 24 Oct 2012 16:48:11 +0100 Subject: [PATCH] staging: comedi: amplc_dio200: implement timer subdevice Implement the timer subdevice for the new PCIe boards. The subdevice was previously marked as unused, but was reserved for this purpose. Signed-off-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/amplc_dio200.c | 145 +++++++++++++++++- 1 file changed, 144 insertions(+), 1 deletion(-) diff --git a/drivers/staging/comedi/drivers/amplc_dio200.c b/drivers/staging/comedi/drivers/amplc_dio200.c index 768a269d48f8..d72a86b3e9ff 100644 --- a/drivers/staging/comedi/drivers/amplc_dio200.c +++ b/drivers/staging/comedi/drivers/amplc_dio200.c @@ -301,6 +301,8 @@ /* Extra registers for new PCIe boards */ #define DIO200_ENHANCE 0x20 /* 1 to enable enhanced features */ #define DIO200_VERSION 0x24 /* Hardware version register */ +#define DIO200_TS_CONFIG 0x600 /* Timestamp timer config register */ +#define DIO200_TS_COUNT 0x602 /* Timestamp timer count register */ /* * Functions for constructing value for DIO_200_?CLK_SCE and @@ -342,6 +344,22 @@ static const unsigned int clock_period[32] = { /* clock sources 12 and later reserved for enhanced boards */ }; +/* + * Timestamp timer configuration register (for new PCIe boards). + */ +#define TS_CONFIG_RESET 0x100 /* Reset counter to zero. */ +#define TS_CONFIG_CLK_SRC_MASK 0x0FF /* Clock source. */ +#define TS_CONFIG_MAX_CLK_SRC 2 /* Maximum clock source value. */ + +/* + * Periods of the timestamp timer clock sources in nanoseconds. + */ +static const unsigned int ts_clock_period[TS_CONFIG_MAX_CLK_SRC + 1] = { + 1, /* 1 nanosecond (but with 20 ns granularity). */ + 1000, /* 1 microsecond. */ + 1000000, /* 1 millisecond. */ +}; + /* * Register region. */ @@ -1621,6 +1639,118 @@ static void dio200_subdev_8255_cleanup(struct comedi_device *dev, kfree(subpriv); } +/* + * Handle 'insn_read' for a timer subdevice. + */ +static int dio200_subdev_timer_read(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + unsigned int n; + + for (n = 0; n < insn->n; n++) + data[n] = dio200_read32(dev, DIO200_TS_COUNT); + return n; +} + +/* + * Reset timer subdevice. + */ +static void dio200_subdev_timer_reset(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + unsigned int clock; + + clock = dio200_read32(dev, DIO200_TS_CONFIG) & TS_CONFIG_CLK_SRC_MASK; + dio200_write32(dev, DIO200_TS_CONFIG, clock | TS_CONFIG_RESET); + dio200_write32(dev, DIO200_TS_CONFIG, clock); +} + +/* + * Get timer subdevice clock source and period. + */ +static void dio200_subdev_timer_get_clock_src(struct comedi_device *dev, + struct comedi_subdevice *s, + unsigned int *src, + unsigned int *period) +{ + unsigned int clk; + + clk = dio200_read32(dev, DIO200_TS_CONFIG) & TS_CONFIG_CLK_SRC_MASK; + *src = clk; + *period = (clk < ARRAY_SIZE(ts_clock_period)) ? + ts_clock_period[clk] : 0; +} + +/* + * Set timer subdevice clock source. + */ +static int dio200_subdev_timer_set_clock_src(struct comedi_device *dev, + struct comedi_subdevice *s, + unsigned int src) +{ + if (src > TS_CONFIG_MAX_CLK_SRC) + return -EINVAL; + dio200_write32(dev, DIO200_TS_CONFIG, src); + return 0; +} + +/* + * Handle 'insn_config' for a timer subdevice. + */ +static int dio200_subdev_timer_config(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + int ret = 0; + + switch (data[0]) { + case INSN_CONFIG_RESET: + dio200_subdev_timer_reset(dev, s); + break; + case INSN_CONFIG_SET_CLOCK_SRC: + ret = dio200_subdev_timer_set_clock_src(dev, s, data[1]); + if (ret < 0) + ret = -EINVAL; + break; + case INSN_CONFIG_GET_CLOCK_SRC: + dio200_subdev_timer_get_clock_src(dev, s, &data[1], &data[2]); + break; + default: + ret = -EINVAL; + break; + } + return ret < 0 ? ret : insn->n; +} + +/* + * This function initializes a timer subdevice. + * + * Uses the timestamp timer registers. There is only one timestamp timer. + */ +static int dio200_subdev_timer_init(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + s->type = COMEDI_SUBD_TIMER; + s->subdev_flags = SDF_READABLE | SDF_LSAMPL; + s->n_chan = 1; + s->maxdata = 0xFFFFFFFF; + s->insn_read = dio200_subdev_timer_read; + s->insn_config = dio200_subdev_timer_config; + return 0; +} + +/* + * This function cleans up a timer subdevice. + */ +static void dio200_subdev_timer_cleanup(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + /* Nothing to do. */ +} + /* * This function does some special set-up for the PCIe boards * PCIe215, PCIe236, PCIe296. @@ -1735,7 +1865,15 @@ static int dio200_common_attach(struct comedi_device *dev, unsigned int irq, } break; case sd_timer: - /* TODO. Fall-thru to default for now. */ + /* Only on PCIe boards. */ + if (DO_PCI) { + ret = dio200_subdev_timer_init(dev, s); + if (ret < 0) + return ret; + } else { + s->type = COMEDI_SUBD_UNUSED; + } + break; default: s->type = COMEDI_SUBD_UNUSED; break; @@ -1897,6 +2035,11 @@ static void dio200_detach(struct comedi_device *dev) case sd_intr: dio200_subdev_intr_cleanup(dev, s); break; + case sd_timer: + /* Only on PCIe boards. */ + if (DO_PCI) + dio200_subdev_timer_cleanup(dev, s); + break; default: break; } -- 2.39.2