#endif
static void ni_handle_fifo_dregs(struct comedi_device *dev);
-static int ni_set_master_clock(struct comedi_device *dev, unsigned source,
- unsigned period_ns);
-
enum aimodes {
AIMODE_NONE = 0,
AIMODE_HALF_FULL = 1,
return 0;
}
+/*
+ * Find best multiplier/divider to try and get the PLL running at 80 MHz
+ * given an arbitrary frequency input clock.
+ */
+static int ni_mseries_get_pll_parameters(unsigned reference_period_ns,
+ unsigned *freq_divider,
+ unsigned *freq_multiplier,
+ unsigned *actual_period_ns)
+{
+ unsigned div;
+ unsigned best_div = 1;
+ static const unsigned max_div = 0x10;
+ unsigned mult;
+ unsigned best_mult = 1;
+ static const unsigned max_mult = 0x100;
+ static const unsigned pico_per_nano = 1000;
+
+ const unsigned reference_picosec = reference_period_ns * pico_per_nano;
+ /* m-series wants the phased-locked loop to output 80MHz, which is divided by 4 to
+ * 20 MHz for most timing clocks */
+ static const unsigned target_picosec = 12500;
+ static const unsigned fudge_factor_80_to_20Mhz = 4;
+ int best_period_picosec = 0;
+ for (div = 1; div <= max_div; ++div) {
+ for (mult = 1; mult <= max_mult; ++mult) {
+ unsigned new_period_ps =
+ (reference_picosec * div) / mult;
+ if (abs(new_period_ps - target_picosec) <
+ abs(best_period_picosec - target_picosec)) {
+ best_period_picosec = new_period_ps;
+ best_div = div;
+ best_mult = mult;
+ }
+ }
+ }
+ if (best_period_picosec == 0) {
+ printk("%s: bug, failed to find pll parameters\n", __func__);
+ return -EIO;
+ }
+ *freq_divider = best_div;
+ *freq_multiplier = best_mult;
+ *actual_period_ns =
+ (best_period_picosec * fudge_factor_80_to_20Mhz +
+ (pico_per_nano / 2)) / pico_per_nano;
+ return 0;
+}
+
+static int ni_mseries_set_pll_master_clock(struct comedi_device *dev,
+ unsigned source, unsigned period_ns)
+{
+ struct ni_private *devpriv = dev->private;
+ static const unsigned min_period_ns = 50;
+ static const unsigned max_period_ns = 1000;
+ static const unsigned timeout = 1000;
+ unsigned pll_control_bits;
+ unsigned freq_divider;
+ unsigned freq_multiplier;
+ unsigned i;
+ int retval;
+
+ if (source == NI_MIO_PLL_PXI10_CLOCK)
+ period_ns = 100;
+ /* these limits are somewhat arbitrary, but NI advertises 1 to 20MHz range so we'll use that */
+ if (period_ns < min_period_ns || period_ns > max_period_ns) {
+ printk
+ ("%s: you must specify an input clock frequency between %i and %i nanosec "
+ "for the phased-lock loop.\n", __func__,
+ min_period_ns, max_period_ns);
+ return -EINVAL;
+ }
+ devpriv->rtsi_trig_direction_reg &= ~Use_RTSI_Clock_Bit;
+ devpriv->stc_writew(dev, devpriv->rtsi_trig_direction_reg,
+ RTSI_Trig_Direction_Register);
+ pll_control_bits =
+ MSeries_PLL_Enable_Bit | MSeries_PLL_VCO_Mode_75_150MHz_Bits;
+ devpriv->clock_and_fout2 |=
+ MSeries_Timebase1_Select_Bit | MSeries_Timebase3_Select_Bit;
+ devpriv->clock_and_fout2 &= ~MSeries_PLL_In_Source_Select_Mask;
+ switch (source) {
+ case NI_MIO_PLL_PXI_STAR_TRIGGER_CLOCK:
+ devpriv->clock_and_fout2 |=
+ MSeries_PLL_In_Source_Select_Star_Trigger_Bits;
+ retval = ni_mseries_get_pll_parameters(period_ns, &freq_divider,
+ &freq_multiplier,
+ &devpriv->clock_ns);
+ if (retval < 0)
+ return retval;
+ break;
+ case NI_MIO_PLL_PXI10_CLOCK:
+ /* pxi clock is 10MHz */
+ devpriv->clock_and_fout2 |=
+ MSeries_PLL_In_Source_Select_PXI_Clock10;
+ retval = ni_mseries_get_pll_parameters(period_ns, &freq_divider,
+ &freq_multiplier,
+ &devpriv->clock_ns);
+ if (retval < 0)
+ return retval;
+ break;
+ default:
+ {
+ unsigned rtsi_channel;
+ static const unsigned max_rtsi_channel = 7;
+ for (rtsi_channel = 0; rtsi_channel <= max_rtsi_channel;
+ ++rtsi_channel) {
+ if (source ==
+ NI_MIO_PLL_RTSI_CLOCK(rtsi_channel)) {
+ devpriv->clock_and_fout2 |=
+ MSeries_PLL_In_Source_Select_RTSI_Bits
+ (rtsi_channel);
+ break;
+ }
+ }
+ if (rtsi_channel > max_rtsi_channel)
+ return -EINVAL;
+ retval = ni_mseries_get_pll_parameters(period_ns,
+ &freq_divider,
+ &freq_multiplier,
+ &devpriv->
+ clock_ns);
+ if (retval < 0)
+ return retval;
+ }
+ break;
+ }
+ ni_writew(devpriv->clock_and_fout2, M_Offset_Clock_and_Fout2);
+ pll_control_bits |=
+ MSeries_PLL_Divisor_Bits(freq_divider) |
+ MSeries_PLL_Multiplier_Bits(freq_multiplier);
+
+ /* printk("using divider=%i, multiplier=%i for PLL. pll_control_bits = 0x%x\n",
+ * freq_divider, freq_multiplier, pll_control_bits); */
+ /* printk("clock_ns=%d\n", devpriv->clock_ns); */
+ ni_writew(pll_control_bits, M_Offset_PLL_Control);
+ devpriv->clock_source = source;
+ /* it seems to typically take a few hundred microseconds for PLL to lock */
+ for (i = 0; i < timeout; ++i) {
+ if (ni_readw(M_Offset_PLL_Status) & MSeries_PLL_Locked_Bit)
+ break;
+ udelay(1);
+ }
+ if (i == timeout) {
+ printk
+ ("%s: timed out waiting for PLL to lock to reference clock source %i with period %i ns.\n",
+ __func__, source, period_ns);
+ return -ETIMEDOUT;
+ }
+ return 3;
+}
+
+static int ni_set_master_clock(struct comedi_device *dev,
+ unsigned source, unsigned period_ns)
+{
+ const struct ni_board_struct *board = comedi_board(dev);
+ struct ni_private *devpriv = dev->private;
+
+ if (source == NI_MIO_INTERNAL_CLOCK) {
+ devpriv->rtsi_trig_direction_reg &= ~Use_RTSI_Clock_Bit;
+ devpriv->stc_writew(dev, devpriv->rtsi_trig_direction_reg,
+ RTSI_Trig_Direction_Register);
+ devpriv->clock_ns = TIMEBASE_1_NS;
+ if (board->reg_type & ni_reg_m_series_mask) {
+ devpriv->clock_and_fout2 &=
+ ~(MSeries_Timebase1_Select_Bit |
+ MSeries_Timebase3_Select_Bit);
+ ni_writew(devpriv->clock_and_fout2,
+ M_Offset_Clock_and_Fout2);
+ ni_writew(0, M_Offset_PLL_Control);
+ }
+ devpriv->clock_source = source;
+ } else {
+ if (board->reg_type & ni_reg_m_series_mask) {
+ return ni_mseries_set_pll_master_clock(dev, source,
+ period_ns);
+ } else {
+ if (source == NI_MIO_RTSI_CLOCK) {
+ devpriv->rtsi_trig_direction_reg |=
+ Use_RTSI_Clock_Bit;
+ devpriv->stc_writew(dev,
+ devpriv->
+ rtsi_trig_direction_reg,
+ RTSI_Trig_Direction_Register);
+ if (period_ns == 0) {
+ printk
+ ("%s: we don't handle an unspecified clock period correctly yet, returning error.\n",
+ __func__);
+ return -EINVAL;
+ } else {
+ devpriv->clock_ns = period_ns;
+ }
+ devpriv->clock_source = source;
+ } else
+ return -EINVAL;
+ }
+ }
+ return 3;
+}
+
static unsigned num_configurable_rtsi_channels(struct comedi_device *dev)
{
const struct ni_board_struct *board = comedi_board(dev);
}
#endif
-
-/* Find best multiplier/divider to try and get the PLL running at 80 MHz
- * given an arbitrary frequency input clock */
-static int ni_mseries_get_pll_parameters(unsigned reference_period_ns,
- unsigned *freq_divider,
- unsigned *freq_multiplier,
- unsigned *actual_period_ns)
-{
- unsigned div;
- unsigned best_div = 1;
- static const unsigned max_div = 0x10;
- unsigned mult;
- unsigned best_mult = 1;
- static const unsigned max_mult = 0x100;
- static const unsigned pico_per_nano = 1000;
-
- const unsigned reference_picosec = reference_period_ns * pico_per_nano;
- /* m-series wants the phased-locked loop to output 80MHz, which is divided by 4 to
- * 20 MHz for most timing clocks */
- static const unsigned target_picosec = 12500;
- static const unsigned fudge_factor_80_to_20Mhz = 4;
- int best_period_picosec = 0;
- for (div = 1; div <= max_div; ++div) {
- for (mult = 1; mult <= max_mult; ++mult) {
- unsigned new_period_ps =
- (reference_picosec * div) / mult;
- if (abs(new_period_ps - target_picosec) <
- abs(best_period_picosec - target_picosec)) {
- best_period_picosec = new_period_ps;
- best_div = div;
- best_mult = mult;
- }
- }
- }
- if (best_period_picosec == 0) {
- printk("%s: bug, failed to find pll parameters\n", __func__);
- return -EIO;
- }
- *freq_divider = best_div;
- *freq_multiplier = best_mult;
- *actual_period_ns =
- (best_period_picosec * fudge_factor_80_to_20Mhz +
- (pico_per_nano / 2)) / pico_per_nano;
- return 0;
-}
-
-static int ni_mseries_set_pll_master_clock(struct comedi_device *dev,
- unsigned source, unsigned period_ns)
-{
- struct ni_private *devpriv = dev->private;
- static const unsigned min_period_ns = 50;
- static const unsigned max_period_ns = 1000;
- static const unsigned timeout = 1000;
- unsigned pll_control_bits;
- unsigned freq_divider;
- unsigned freq_multiplier;
- unsigned i;
- int retval;
-
- if (source == NI_MIO_PLL_PXI10_CLOCK)
- period_ns = 100;
- /* these limits are somewhat arbitrary, but NI advertises 1 to 20MHz range so we'll use that */
- if (period_ns < min_period_ns || period_ns > max_period_ns) {
- printk
- ("%s: you must specify an input clock frequency between %i and %i nanosec "
- "for the phased-lock loop.\n", __func__,
- min_period_ns, max_period_ns);
- return -EINVAL;
- }
- devpriv->rtsi_trig_direction_reg &= ~Use_RTSI_Clock_Bit;
- devpriv->stc_writew(dev, devpriv->rtsi_trig_direction_reg,
- RTSI_Trig_Direction_Register);
- pll_control_bits =
- MSeries_PLL_Enable_Bit | MSeries_PLL_VCO_Mode_75_150MHz_Bits;
- devpriv->clock_and_fout2 |=
- MSeries_Timebase1_Select_Bit | MSeries_Timebase3_Select_Bit;
- devpriv->clock_and_fout2 &= ~MSeries_PLL_In_Source_Select_Mask;
- switch (source) {
- case NI_MIO_PLL_PXI_STAR_TRIGGER_CLOCK:
- devpriv->clock_and_fout2 |=
- MSeries_PLL_In_Source_Select_Star_Trigger_Bits;
- retval = ni_mseries_get_pll_parameters(period_ns, &freq_divider,
- &freq_multiplier,
- &devpriv->clock_ns);
- if (retval < 0)
- return retval;
- break;
- case NI_MIO_PLL_PXI10_CLOCK:
- /* pxi clock is 10MHz */
- devpriv->clock_and_fout2 |=
- MSeries_PLL_In_Source_Select_PXI_Clock10;
- retval = ni_mseries_get_pll_parameters(period_ns, &freq_divider,
- &freq_multiplier,
- &devpriv->clock_ns);
- if (retval < 0)
- return retval;
- break;
- default:
- {
- unsigned rtsi_channel;
- static const unsigned max_rtsi_channel = 7;
- for (rtsi_channel = 0; rtsi_channel <= max_rtsi_channel;
- ++rtsi_channel) {
- if (source ==
- NI_MIO_PLL_RTSI_CLOCK(rtsi_channel)) {
- devpriv->clock_and_fout2 |=
- MSeries_PLL_In_Source_Select_RTSI_Bits
- (rtsi_channel);
- break;
- }
- }
- if (rtsi_channel > max_rtsi_channel)
- return -EINVAL;
- retval = ni_mseries_get_pll_parameters(period_ns,
- &freq_divider,
- &freq_multiplier,
- &devpriv->
- clock_ns);
- if (retval < 0)
- return retval;
- }
- break;
- }
- ni_writew(devpriv->clock_and_fout2, M_Offset_Clock_and_Fout2);
- pll_control_bits |=
- MSeries_PLL_Divisor_Bits(freq_divider) |
- MSeries_PLL_Multiplier_Bits(freq_multiplier);
-
- /* printk("using divider=%i, multiplier=%i for PLL. pll_control_bits = 0x%x\n",
- * freq_divider, freq_multiplier, pll_control_bits); */
- /* printk("clock_ns=%d\n", devpriv->clock_ns); */
- ni_writew(pll_control_bits, M_Offset_PLL_Control);
- devpriv->clock_source = source;
- /* it seems to typically take a few hundred microseconds for PLL to lock */
- for (i = 0; i < timeout; ++i) {
- if (ni_readw(M_Offset_PLL_Status) & MSeries_PLL_Locked_Bit)
- break;
- udelay(1);
- }
- if (i == timeout) {
- printk
- ("%s: timed out waiting for PLL to lock to reference clock source %i with period %i ns.\n",
- __func__, source, period_ns);
- return -ETIMEDOUT;
- }
- return 3;
-}
-
-static int ni_set_master_clock(struct comedi_device *dev, unsigned source,
- unsigned period_ns)
-{
- const struct ni_board_struct *board = comedi_board(dev);
- struct ni_private *devpriv = dev->private;
-
- if (source == NI_MIO_INTERNAL_CLOCK) {
- devpriv->rtsi_trig_direction_reg &= ~Use_RTSI_Clock_Bit;
- devpriv->stc_writew(dev, devpriv->rtsi_trig_direction_reg,
- RTSI_Trig_Direction_Register);
- devpriv->clock_ns = TIMEBASE_1_NS;
- if (board->reg_type & ni_reg_m_series_mask) {
- devpriv->clock_and_fout2 &=
- ~(MSeries_Timebase1_Select_Bit |
- MSeries_Timebase3_Select_Bit);
- ni_writew(devpriv->clock_and_fout2,
- M_Offset_Clock_and_Fout2);
- ni_writew(0, M_Offset_PLL_Control);
- }
- devpriv->clock_source = source;
- } else {
- if (board->reg_type & ni_reg_m_series_mask) {
- return ni_mseries_set_pll_master_clock(dev, source,
- period_ns);
- } else {
- if (source == NI_MIO_RTSI_CLOCK) {
- devpriv->rtsi_trig_direction_reg |=
- Use_RTSI_Clock_Bit;
- devpriv->stc_writew(dev,
- devpriv->
- rtsi_trig_direction_reg,
- RTSI_Trig_Direction_Register);
- if (period_ns == 0) {
- printk
- ("%s: we don't handle an unspecified clock period correctly yet, returning error.\n",
- __func__);
- return -EINVAL;
- } else {
- devpriv->clock_ns = period_ns;
- }
- devpriv->clock_source = source;
- } else
- return -EINVAL;
- }
- }
- return 3;
-}
projects / platform / kernel / linux-rpi.git / commitdiff