diff options
Diffstat (limited to 'drivers/comedi/drivers/ni_tio.c')
| -rw-r--r-- | drivers/comedi/drivers/ni_tio.c | 1842 |
1 files changed, 1842 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/ni_tio.c b/drivers/comedi/drivers/ni_tio.c new file mode 100644 index 000000000..da6826d77 --- /dev/null +++ b/drivers/comedi/drivers/ni_tio.c @@ -0,0 +1,1842 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Support for NI general purpose counters + * + * Copyright (C) 2006 Frank Mori Hess <fmhess@users.sourceforge.net> + */ + +/* + * Module: ni_tio + * Description: National Instruments general purpose counters + * Author: J.P. Mellor <jpmellor@rose-hulman.edu>, + * Herman.Bruyninckx@mech.kuleuven.ac.be, + * Wim.Meeussen@mech.kuleuven.ac.be, + * Klaas.Gadeyne@mech.kuleuven.ac.be, + * Frank Mori Hess <fmhess@users.sourceforge.net> + * Updated: Thu Nov 16 09:50:32 EST 2006 + * Status: works + * + * This module is not used directly by end-users. Rather, it + * is used by other drivers (for example ni_660x and ni_pcimio) + * to provide support for NI's general purpose counters. It was + * originally based on the counter code from ni_660x.c and + * ni_mio_common.c. + * + * References: + * DAQ 660x Register-Level Programmer Manual (NI 370505A-01) + * DAQ 6601/6602 User Manual (NI 322137B-01) + * 340934b.pdf DAQ-STC reference manual + * + * TODO: Support use of both banks X and Y + */ + +#include <linux/module.h> +#include <linux/slab.h> + +#include "ni_tio_internal.h" + +/* + * clock sources for ni e and m series boards, + * get bits with GI_SRC_SEL() + */ +#define NI_M_TIMEBASE_1_CLK 0x0 /* 20MHz */ +#define NI_M_PFI_CLK(x) (((x) < 10) ? (1 + (x)) : (0xb + (x))) +#define NI_M_RTSI_CLK(x) (((x) == 7) ? 0x1b : (0xb + (x))) +#define NI_M_TIMEBASE_2_CLK 0x12 /* 100KHz */ +#define NI_M_NEXT_TC_CLK 0x13 +#define NI_M_NEXT_GATE_CLK 0x14 /* Gi_Src_SubSelect=0 */ +#define NI_M_PXI_STAR_TRIGGER_CLK 0x14 /* Gi_Src_SubSelect=1 */ +#define NI_M_PXI10_CLK 0x1d +#define NI_M_TIMEBASE_3_CLK 0x1e /* 80MHz, Gi_Src_SubSelect=0 */ +#define NI_M_ANALOG_TRIGGER_OUT_CLK 0x1e /* Gi_Src_SubSelect=1 */ +#define NI_M_LOGIC_LOW_CLK 0x1f +#define NI_M_MAX_PFI_CHAN 15 +#define NI_M_MAX_RTSI_CHAN 7 + +/* + * clock sources for ni_660x boards, + * get bits with GI_SRC_SEL() + */ +#define NI_660X_TIMEBASE_1_CLK 0x0 /* 20MHz */ +#define NI_660X_SRC_PIN_I_CLK 0x1 +#define NI_660X_SRC_PIN_CLK(x) (0x2 + (x)) +#define NI_660X_NEXT_GATE_CLK 0xa +#define NI_660X_RTSI_CLK(x) (0xb + (x)) +#define NI_660X_TIMEBASE_2_CLK 0x12 /* 100KHz */ +#define NI_660X_NEXT_TC_CLK 0x13 +#define NI_660X_TIMEBASE_3_CLK 0x1e /* 80MHz */ +#define NI_660X_LOGIC_LOW_CLK 0x1f +#define NI_660X_MAX_SRC_PIN 7 +#define NI_660X_MAX_RTSI_CHAN 6 + +/* ni m series gate_select */ +#define NI_M_TIMESTAMP_MUX_GATE_SEL 0x0 +#define NI_M_PFI_GATE_SEL(x) (((x) < 10) ? (1 + (x)) : (0xb + (x))) +#define NI_M_RTSI_GATE_SEL(x) (((x) == 7) ? 0x1b : (0xb + (x))) +#define NI_M_AI_START2_GATE_SEL 0x12 +#define NI_M_PXI_STAR_TRIGGER_GATE_SEL 0x13 +#define NI_M_NEXT_OUT_GATE_SEL 0x14 +#define NI_M_AI_START1_GATE_SEL 0x1c +#define NI_M_NEXT_SRC_GATE_SEL 0x1d +#define NI_M_ANALOG_TRIG_OUT_GATE_SEL 0x1e +#define NI_M_LOGIC_LOW_GATE_SEL 0x1f + +/* ni_660x gate select */ +#define NI_660X_SRC_PIN_I_GATE_SEL 0x0 +#define NI_660X_GATE_PIN_I_GATE_SEL 0x1 +#define NI_660X_PIN_GATE_SEL(x) (0x2 + (x)) +#define NI_660X_NEXT_SRC_GATE_SEL 0xa +#define NI_660X_RTSI_GATE_SEL(x) (0xb + (x)) +#define NI_660X_NEXT_OUT_GATE_SEL 0x14 +#define NI_660X_LOGIC_LOW_GATE_SEL 0x1f +#define NI_660X_MAX_GATE_PIN 7 + +/* ni_660x second gate select */ +#define NI_660X_SRC_PIN_I_GATE2_SEL 0x0 +#define NI_660X_UD_PIN_I_GATE2_SEL 0x1 +#define NI_660X_UD_PIN_GATE2_SEL(x) (0x2 + (x)) +#define NI_660X_NEXT_SRC_GATE2_SEL 0xa +#define NI_660X_RTSI_GATE2_SEL(x) (0xb + (x)) +#define NI_660X_NEXT_OUT_GATE2_SEL 0x14 +#define NI_660X_SELECTED_GATE2_SEL 0x1e +#define NI_660X_LOGIC_LOW_GATE2_SEL 0x1f +#define NI_660X_MAX_UP_DOWN_PIN 7 + +static inline unsigned int GI_PRESCALE_X2(enum ni_gpct_variant variant) +{ + switch (variant) { + case ni_gpct_variant_e_series: + default: + return 0; + case ni_gpct_variant_m_series: + return GI_M_PRESCALE_X2; + case ni_gpct_variant_660x: + return GI_660X_PRESCALE_X2; + } +} + +static inline unsigned int GI_PRESCALE_X8(enum ni_gpct_variant variant) +{ + switch (variant) { + case ni_gpct_variant_e_series: + default: + return 0; + case ni_gpct_variant_m_series: + return GI_M_PRESCALE_X8; + case ni_gpct_variant_660x: + return GI_660X_PRESCALE_X8; + } +} + +static bool ni_tio_has_gate2_registers(const struct ni_gpct_device *counter_dev) +{ + switch (counter_dev->variant) { + case ni_gpct_variant_e_series: + default: + return false; + case ni_gpct_variant_m_series: + case ni_gpct_variant_660x: + return true; + } +} + +/** + * ni_tio_write() - Write a TIO register using the driver provided callback. + * @counter: struct ni_gpct counter. + * @value: the value to write + * @reg: the register to write. + */ +void ni_tio_write(struct ni_gpct *counter, unsigned int value, + enum ni_gpct_register reg) +{ + if (reg < NITIO_NUM_REGS) + counter->counter_dev->write(counter, value, reg); +} +EXPORT_SYMBOL_GPL(ni_tio_write); + +/** + * ni_tio_read() - Read a TIO register using the driver provided callback. + * @counter: struct ni_gpct counter. + * @reg: the register to read. + */ +unsigned int ni_tio_read(struct ni_gpct *counter, enum ni_gpct_register reg) +{ + if (reg < NITIO_NUM_REGS) + return counter->counter_dev->read(counter, reg); + return 0; +} +EXPORT_SYMBOL_GPL(ni_tio_read); + +static void ni_tio_reset_count_and_disarm(struct ni_gpct *counter) +{ + unsigned int cidx = counter->counter_index; + + ni_tio_write(counter, GI_RESET(cidx), NITIO_RESET_REG(cidx)); +} + +static int ni_tio_clock_period_ps(const struct ni_gpct *counter, + unsigned int generic_clock_source, + u64 *period_ps) +{ + u64 clock_period_ps; + + switch (generic_clock_source & NI_GPCT_CLOCK_SRC_SELECT_MASK) { + case NI_GPCT_TIMEBASE_1_CLOCK_SRC_BITS: + clock_period_ps = 50000; + break; + case NI_GPCT_TIMEBASE_2_CLOCK_SRC_BITS: + clock_period_ps = 10000000; + break; + case NI_GPCT_TIMEBASE_3_CLOCK_SRC_BITS: + clock_period_ps = 12500; + break; + case NI_GPCT_PXI10_CLOCK_SRC_BITS: + clock_period_ps = 100000; + break; + default: + /* + * clock period is specified by user with prescaling + * already taken into account. + */ + *period_ps = counter->clock_period_ps; + return 0; + } + + switch (generic_clock_source & NI_GPCT_PRESCALE_MODE_CLOCK_SRC_MASK) { + case NI_GPCT_NO_PRESCALE_CLOCK_SRC_BITS: + break; + case NI_GPCT_PRESCALE_X2_CLOCK_SRC_BITS: + clock_period_ps *= 2; + break; + case NI_GPCT_PRESCALE_X8_CLOCK_SRC_BITS: + clock_period_ps *= 8; + break; + default: + return -EINVAL; + } + *period_ps = clock_period_ps; + return 0; +} + +static void ni_tio_set_bits_transient(struct ni_gpct *counter, + enum ni_gpct_register reg, + unsigned int mask, unsigned int value, + unsigned int transient) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int chip = counter->chip_index; + unsigned long flags; + + if (reg < NITIO_NUM_REGS && chip < counter_dev->num_chips) { + unsigned int *regs = counter_dev->regs[chip]; + + spin_lock_irqsave(&counter_dev->regs_lock, flags); + regs[reg] &= ~mask; + regs[reg] |= (value & mask); + ni_tio_write(counter, regs[reg] | transient, reg); + spin_unlock_irqrestore(&counter_dev->regs_lock, flags); + } +} + +/** + * ni_tio_set_bits() - Safely write a counter register. + * @counter: struct ni_gpct counter. + * @reg: the register to write. + * @mask: the bits to change. + * @value: the new bits value. + * + * Used to write to, and update the software copy, a register whose bits may + * be twiddled in interrupt context, or whose software copy may be read in + * interrupt context. + */ +void ni_tio_set_bits(struct ni_gpct *counter, enum ni_gpct_register reg, + unsigned int mask, unsigned int value) +{ + ni_tio_set_bits_transient(counter, reg, mask, value, 0x0); +} +EXPORT_SYMBOL_GPL(ni_tio_set_bits); + +/** + * ni_tio_get_soft_copy() - Safely read the software copy of a counter register. + * @counter: struct ni_gpct counter. + * @reg: the register to read. + * + * Used to get the software copy of a register whose bits might be modified + * in interrupt context, or whose software copy might need to be read in + * interrupt context. + */ +unsigned int ni_tio_get_soft_copy(const struct ni_gpct *counter, + enum ni_gpct_register reg) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int chip = counter->chip_index; + unsigned int value = 0; + unsigned long flags; + + if (reg < NITIO_NUM_REGS && chip < counter_dev->num_chips) { + spin_lock_irqsave(&counter_dev->regs_lock, flags); + value = counter_dev->regs[chip][reg]; + spin_unlock_irqrestore(&counter_dev->regs_lock, flags); + } + return value; +} +EXPORT_SYMBOL_GPL(ni_tio_get_soft_copy); + +static unsigned int ni_tio_clock_src_modifiers(const struct ni_gpct *counter) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + unsigned int counting_mode_bits = + ni_tio_get_soft_copy(counter, NITIO_CNT_MODE_REG(cidx)); + unsigned int bits = 0; + + if (ni_tio_get_soft_copy(counter, NITIO_INPUT_SEL_REG(cidx)) & + GI_SRC_POL_INVERT) + bits |= NI_GPCT_INVERT_CLOCK_SRC_BIT; + if (counting_mode_bits & GI_PRESCALE_X2(counter_dev->variant)) + bits |= NI_GPCT_PRESCALE_X2_CLOCK_SRC_BITS; + if (counting_mode_bits & GI_PRESCALE_X8(counter_dev->variant)) + bits |= NI_GPCT_PRESCALE_X8_CLOCK_SRC_BITS; + return bits; +} + +static int ni_m_series_clock_src_select(const struct ni_gpct *counter, + unsigned int *clk_src) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + unsigned int chip = counter->chip_index; + unsigned int second_gate_reg = NITIO_GATE2_REG(cidx); + unsigned int clock_source = 0; + unsigned int src; + unsigned int i; + + src = GI_BITS_TO_SRC(ni_tio_get_soft_copy(counter, + NITIO_INPUT_SEL_REG(cidx))); + + switch (src) { + case NI_M_TIMEBASE_1_CLK: + clock_source = NI_GPCT_TIMEBASE_1_CLOCK_SRC_BITS; + break; + case NI_M_TIMEBASE_2_CLK: + clock_source = NI_GPCT_TIMEBASE_2_CLOCK_SRC_BITS; + break; + case NI_M_TIMEBASE_3_CLK: + if (counter_dev->regs[chip][second_gate_reg] & GI_SRC_SUBSEL) + clock_source = + NI_GPCT_ANALOG_TRIGGER_OUT_CLOCK_SRC_BITS; + else + clock_source = NI_GPCT_TIMEBASE_3_CLOCK_SRC_BITS; + break; + case NI_M_LOGIC_LOW_CLK: + clock_source = NI_GPCT_LOGIC_LOW_CLOCK_SRC_BITS; + break; + case NI_M_NEXT_GATE_CLK: + if (counter_dev->regs[chip][second_gate_reg] & GI_SRC_SUBSEL) + clock_source = NI_GPCT_PXI_STAR_TRIGGER_CLOCK_SRC_BITS; + else + clock_source = NI_GPCT_NEXT_GATE_CLOCK_SRC_BITS; + break; + case NI_M_PXI10_CLK: + clock_source = NI_GPCT_PXI10_CLOCK_SRC_BITS; + break; + case NI_M_NEXT_TC_CLK: + clock_source = NI_GPCT_NEXT_TC_CLOCK_SRC_BITS; + break; + default: + for (i = 0; i <= NI_M_MAX_RTSI_CHAN; ++i) { + if (src == NI_M_RTSI_CLK(i)) { + clock_source = NI_GPCT_RTSI_CLOCK_SRC_BITS(i); + break; + } + } + if (i <= NI_M_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_M_MAX_PFI_CHAN; ++i) { + if (src == NI_M_PFI_CLK(i)) { + clock_source = NI_GPCT_PFI_CLOCK_SRC_BITS(i); + break; + } + } + if (i <= NI_M_MAX_PFI_CHAN) + break; + return -EINVAL; + } + clock_source |= ni_tio_clock_src_modifiers(counter); + *clk_src = clock_source; + return 0; +} + +static int ni_660x_clock_src_select(const struct ni_gpct *counter, + unsigned int *clk_src) +{ + unsigned int clock_source = 0; + unsigned int cidx = counter->counter_index; + unsigned int src; + unsigned int i; + + src = GI_BITS_TO_SRC(ni_tio_get_soft_copy(counter, + NITIO_INPUT_SEL_REG(cidx))); + + switch (src) { + case NI_660X_TIMEBASE_1_CLK: + clock_source = NI_GPCT_TIMEBASE_1_CLOCK_SRC_BITS; + break; + case NI_660X_TIMEBASE_2_CLK: + clock_source = NI_GPCT_TIMEBASE_2_CLOCK_SRC_BITS; + break; + case NI_660X_TIMEBASE_3_CLK: + clock_source = NI_GPCT_TIMEBASE_3_CLOCK_SRC_BITS; + break; + case NI_660X_LOGIC_LOW_CLK: + clock_source = NI_GPCT_LOGIC_LOW_CLOCK_SRC_BITS; + break; + case NI_660X_SRC_PIN_I_CLK: + clock_source = NI_GPCT_SOURCE_PIN_i_CLOCK_SRC_BITS; + break; + case NI_660X_NEXT_GATE_CLK: + clock_source = NI_GPCT_NEXT_GATE_CLOCK_SRC_BITS; + break; + case NI_660X_NEXT_TC_CLK: + clock_source = NI_GPCT_NEXT_TC_CLOCK_SRC_BITS; + break; + default: + for (i = 0; i <= NI_660X_MAX_RTSI_CHAN; ++i) { + if (src == NI_660X_RTSI_CLK(i)) { + clock_source = NI_GPCT_RTSI_CLOCK_SRC_BITS(i); + break; + } + } + if (i <= NI_660X_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_660X_MAX_SRC_PIN; ++i) { + if (src == NI_660X_SRC_PIN_CLK(i)) { + clock_source = + NI_GPCT_SOURCE_PIN_CLOCK_SRC_BITS(i); + break; + } + } + if (i <= NI_660X_MAX_SRC_PIN) + break; + return -EINVAL; + } + clock_source |= ni_tio_clock_src_modifiers(counter); + *clk_src = clock_source; + return 0; +} + +static int ni_tio_generic_clock_src_select(const struct ni_gpct *counter, + unsigned int *clk_src) +{ + switch (counter->counter_dev->variant) { + case ni_gpct_variant_e_series: + case ni_gpct_variant_m_series: + default: + return ni_m_series_clock_src_select(counter, clk_src); + case ni_gpct_variant_660x: + return ni_660x_clock_src_select(counter, clk_src); + } +} + +static void ni_tio_set_sync_mode(struct ni_gpct *counter) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + static const u64 min_normal_sync_period_ps = 25000; + unsigned int mask = 0; + unsigned int bits = 0; + unsigned int reg; + unsigned int mode; + unsigned int clk_src = 0; + u64 ps = 0; + int ret; + bool force_alt_sync; + + /* only m series and 660x variants have counting mode registers */ + switch (counter_dev->variant) { + case ni_gpct_variant_e_series: + default: + return; + case ni_gpct_variant_m_series: + mask = GI_M_ALT_SYNC; + break; + case ni_gpct_variant_660x: + mask = GI_660X_ALT_SYNC; + break; + } + + reg = NITIO_CNT_MODE_REG(cidx); + mode = ni_tio_get_soft_copy(counter, reg); + switch (mode & GI_CNT_MODE_MASK) { + case GI_CNT_MODE_QUADX1: + case GI_CNT_MODE_QUADX2: + case GI_CNT_MODE_QUADX4: + case GI_CNT_MODE_SYNC_SRC: + force_alt_sync = true; + break; + default: + force_alt_sync = false; + break; + } + + ret = ni_tio_generic_clock_src_select(counter, &clk_src); + if (ret) + return; + ret = ni_tio_clock_period_ps(counter, clk_src, &ps); + if (ret) + return; + /* + * It's not clear what we should do if clock_period is unknown, so we + * are not using the alt sync bit in that case. + */ + if (force_alt_sync || (ps && ps < min_normal_sync_period_ps)) + bits = mask; + + ni_tio_set_bits(counter, reg, mask, bits); +} + +static int ni_tio_set_counter_mode(struct ni_gpct *counter, unsigned int mode) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + unsigned int mode_reg_mask; + unsigned int mode_reg_values; + unsigned int input_select_bits = 0; + /* these bits map directly on to the mode register */ + static const unsigned int mode_reg_direct_mask = + NI_GPCT_GATE_ON_BOTH_EDGES_BIT | NI_GPCT_EDGE_GATE_MODE_MASK | + NI_GPCT_STOP_MODE_MASK | NI_GPCT_OUTPUT_MODE_MASK | + NI_GPCT_HARDWARE_DISARM_MASK | NI_GPCT_LOADING_ON_TC_BIT | + NI_GPCT_LOADING_ON_GATE_BIT | NI_GPCT_LOAD_B_SELECT_BIT; + + mode_reg_mask = mode_reg_direct_mask | GI_RELOAD_SRC_SWITCHING; + mode_reg_values = mode & mode_reg_direct_mask; + switch (mode & NI_GPCT_RELOAD_SOURCE_MASK) { + case NI_GPCT_RELOAD_SOURCE_FIXED_BITS: + break; + case NI_GPCT_RELOAD_SOURCE_SWITCHING_BITS: + mode_reg_values |= GI_RELOAD_SRC_SWITCHING; + break; + case NI_GPCT_RELOAD_SOURCE_GATE_SELECT_BITS: + input_select_bits |= GI_GATE_SEL_LOAD_SRC; + mode_reg_mask |= GI_GATING_MODE_MASK; + mode_reg_values |= GI_LEVEL_GATING; + break; + default: + break; + } + ni_tio_set_bits(counter, NITIO_MODE_REG(cidx), + mode_reg_mask, mode_reg_values); + + if (ni_tio_counting_mode_registers_present(counter_dev)) { + unsigned int bits = 0; + + bits |= GI_CNT_MODE(mode >> NI_GPCT_COUNTING_MODE_SHIFT); + bits |= GI_INDEX_PHASE((mode >> NI_GPCT_INDEX_PHASE_BITSHIFT)); + if (mode & NI_GPCT_INDEX_ENABLE_BIT) + bits |= GI_INDEX_MODE; + ni_tio_set_bits(counter, NITIO_CNT_MODE_REG(cidx), + GI_CNT_MODE_MASK | GI_INDEX_PHASE_MASK | + GI_INDEX_MODE, bits); + ni_tio_set_sync_mode(counter); + } + + ni_tio_set_bits(counter, NITIO_CMD_REG(cidx), GI_CNT_DIR_MASK, + GI_CNT_DIR(mode >> NI_GPCT_COUNTING_DIRECTION_SHIFT)); + + if (mode & NI_GPCT_OR_GATE_BIT) + input_select_bits |= GI_OR_GATE; + if (mode & NI_GPCT_INVERT_OUTPUT_BIT) + input_select_bits |= GI_OUTPUT_POL_INVERT; + ni_tio_set_bits(counter, NITIO_INPUT_SEL_REG(cidx), + GI_GATE_SEL_LOAD_SRC | GI_OR_GATE | + GI_OUTPUT_POL_INVERT, input_select_bits); + + return 0; +} + +int ni_tio_arm(struct ni_gpct *counter, bool arm, unsigned int start_trigger) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + unsigned int transient_bits = 0; + + if (arm) { + unsigned int mask = 0; + unsigned int bits = 0; + + /* only m series and 660x have counting mode registers */ + switch (counter_dev->variant) { + case ni_gpct_variant_e_series: + default: + break; + case ni_gpct_variant_m_series: + mask = GI_M_HW_ARM_SEL_MASK; + break; + case ni_gpct_variant_660x: + mask = GI_660X_HW_ARM_SEL_MASK; + break; + } + + switch (start_trigger) { + case NI_GPCT_ARM_IMMEDIATE: + transient_bits |= GI_ARM; + break; + case NI_GPCT_ARM_PAIRED_IMMEDIATE: + transient_bits |= GI_ARM | GI_ARM_COPY; + break; + default: + /* + * for m series and 660x, pass-through the least + * significant bits so we can figure out what select + * later + */ + if (mask && (start_trigger & NI_GPCT_ARM_UNKNOWN)) { + bits |= GI_HW_ARM_ENA | + (GI_HW_ARM_SEL(start_trigger) & mask); + } else { + return -EINVAL; + } + break; + } + + if (mask) + ni_tio_set_bits(counter, NITIO_CNT_MODE_REG(cidx), + GI_HW_ARM_ENA | mask, bits); + } else { + transient_bits |= GI_DISARM; + } + ni_tio_set_bits_transient(counter, NITIO_CMD_REG(cidx), + 0, 0, transient_bits); + return 0; +} +EXPORT_SYMBOL_GPL(ni_tio_arm); + +static int ni_660x_clk_src(unsigned int clock_source, unsigned int *bits) +{ + unsigned int clk_src = clock_source & NI_GPCT_CLOCK_SRC_SELECT_MASK; + unsigned int ni_660x_clock; + unsigned int i; + + switch (clk_src) { + case NI_GPCT_TIMEBASE_1_CLOCK_SRC_BITS: + ni_660x_clock = NI_660X_TIMEBASE_1_CLK; + break; + case NI_GPCT_TIMEBASE_2_CLOCK_SRC_BITS: + ni_660x_clock = NI_660X_TIMEBASE_2_CLK; + break; + case NI_GPCT_TIMEBASE_3_CLOCK_SRC_BITS: + ni_660x_clock = NI_660X_TIMEBASE_3_CLK; + break; + case NI_GPCT_LOGIC_LOW_CLOCK_SRC_BITS: + ni_660x_clock = NI_660X_LOGIC_LOW_CLK; + break; + case NI_GPCT_SOURCE_PIN_i_CLOCK_SRC_BITS: + ni_660x_clock = NI_660X_SRC_PIN_I_CLK; + break; + case NI_GPCT_NEXT_GATE_CLOCK_SRC_BITS: + ni_660x_clock = NI_660X_NEXT_GATE_CLK; + break; + case NI_GPCT_NEXT_TC_CLOCK_SRC_BITS: + ni_660x_clock = NI_660X_NEXT_TC_CLK; + break; + default: + for (i = 0; i <= NI_660X_MAX_RTSI_CHAN; ++i) { + if (clk_src == NI_GPCT_RTSI_CLOCK_SRC_BITS(i)) { + ni_660x_clock = NI_660X_RTSI_CLK(i); + break; + } + } + if (i <= NI_660X_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_660X_MAX_SRC_PIN; ++i) { + if (clk_src == NI_GPCT_SOURCE_PIN_CLOCK_SRC_BITS(i)) { + ni_660x_clock = NI_660X_SRC_PIN_CLK(i); + break; + } + } + if (i <= NI_660X_MAX_SRC_PIN) + break; + return -EINVAL; + } + *bits = GI_SRC_SEL(ni_660x_clock); + return 0; +} + +static int ni_m_clk_src(unsigned int clock_source, unsigned int *bits) +{ + unsigned int clk_src = clock_source & NI_GPCT_CLOCK_SRC_SELECT_MASK; + unsigned int ni_m_series_clock; + unsigned int i; + + switch (clk_src) { + case NI_GPCT_TIMEBASE_1_CLOCK_SRC_BITS: + ni_m_series_clock = NI_M_TIMEBASE_1_CLK; + break; + case NI_GPCT_TIMEBASE_2_CLOCK_SRC_BITS: + ni_m_series_clock = NI_M_TIMEBASE_2_CLK; + break; + case NI_GPCT_TIMEBASE_3_CLOCK_SRC_BITS: + ni_m_series_clock = NI_M_TIMEBASE_3_CLK; + break; + case NI_GPCT_LOGIC_LOW_CLOCK_SRC_BITS: + ni_m_series_clock = NI_M_LOGIC_LOW_CLK; + break; + case NI_GPCT_NEXT_GATE_CLOCK_SRC_BITS: + ni_m_series_clock = NI_M_NEXT_GATE_CLK; + break; + case NI_GPCT_NEXT_TC_CLOCK_SRC_BITS: + ni_m_series_clock = NI_M_NEXT_TC_CLK; + break; + case NI_GPCT_PXI10_CLOCK_SRC_BITS: + ni_m_series_clock = NI_M_PXI10_CLK; + break; + case NI_GPCT_PXI_STAR_TRIGGER_CLOCK_SRC_BITS: + ni_m_series_clock = NI_M_PXI_STAR_TRIGGER_CLK; + break; + case NI_GPCT_ANALOG_TRIGGER_OUT_CLOCK_SRC_BITS: + ni_m_series_clock = NI_M_ANALOG_TRIGGER_OUT_CLK; + break; + default: + for (i = 0; i <= NI_M_MAX_RTSI_CHAN; ++i) { + if (clk_src == NI_GPCT_RTSI_CLOCK_SRC_BITS(i)) { + ni_m_series_clock = NI_M_RTSI_CLK(i); + break; + } + } + if (i <= NI_M_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_M_MAX_PFI_CHAN; ++i) { + if (clk_src == NI_GPCT_PFI_CLOCK_SRC_BITS(i)) { + ni_m_series_clock = NI_M_PFI_CLK(i); + break; + } + } + if (i <= NI_M_MAX_PFI_CHAN) + break; + return -EINVAL; + } + *bits = GI_SRC_SEL(ni_m_series_clock); + return 0; +}; + +static void ni_tio_set_source_subselect(struct ni_gpct *counter, + unsigned int clock_source) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + unsigned int chip = counter->chip_index; + unsigned int second_gate_reg = NITIO_GATE2_REG(cidx); + + if (counter_dev->variant != ni_gpct_variant_m_series) + return; + switch (clock_source & NI_GPCT_CLOCK_SRC_SELECT_MASK) { + /* Gi_Source_Subselect is zero */ + case NI_GPCT_NEXT_GATE_CLOCK_SRC_BITS: + case NI_GPCT_TIMEBASE_3_CLOCK_SRC_BITS: + counter_dev->regs[chip][second_gate_reg] &= ~GI_SRC_SUBSEL; + break; + /* Gi_Source_Subselect is one */ + case NI_GPCT_ANALOG_TRIGGER_OUT_CLOCK_SRC_BITS: + case NI_GPCT_PXI_STAR_TRIGGER_CLOCK_SRC_BITS: + counter_dev->regs[chip][second_gate_reg] |= GI_SRC_SUBSEL; + break; + /* Gi_Source_Subselect doesn't matter */ + default: + return; + } + ni_tio_write(counter, counter_dev->regs[chip][second_gate_reg], + second_gate_reg); +} + +static int ni_tio_set_clock_src(struct ni_gpct *counter, + unsigned int clock_source, + unsigned int period_ns) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + unsigned int bits = 0; + int ret; + + switch (counter_dev->variant) { + case ni_gpct_variant_660x: + ret = ni_660x_clk_src(clock_source, &bits); + break; + case ni_gpct_variant_e_series: + case ni_gpct_variant_m_series: + default: + ret = ni_m_clk_src(clock_source, &bits); + break; + } + if (ret) { + struct comedi_device *dev = counter_dev->dev; + + dev_err(dev->class_dev, "invalid clock source 0x%x\n", + clock_source); + return ret; + } + + if (clock_source & NI_GPCT_INVERT_CLOCK_SRC_BIT) + bits |= GI_SRC_POL_INVERT; + ni_tio_set_bits(counter, NITIO_INPUT_SEL_REG(cidx), + GI_SRC_SEL_MASK | GI_SRC_POL_INVERT, bits); + ni_tio_set_source_subselect(counter, clock_source); + + if (ni_tio_counting_mode_registers_present(counter_dev)) { + bits = 0; + switch (clock_source & NI_GPCT_PRESCALE_MODE_CLOCK_SRC_MASK) { + case NI_GPCT_NO_PRESCALE_CLOCK_SRC_BITS: + break; + case NI_GPCT_PRESCALE_X2_CLOCK_SRC_BITS: + bits |= GI_PRESCALE_X2(counter_dev->variant); + break; + case NI_GPCT_PRESCALE_X8_CLOCK_SRC_BITS: + bits |= GI_PRESCALE_X8(counter_dev->variant); + break; + default: + return -EINVAL; + } + ni_tio_set_bits(counter, NITIO_CNT_MODE_REG(cidx), + GI_PRESCALE_X2(counter_dev->variant) | + GI_PRESCALE_X8(counter_dev->variant), bits); + } + counter->clock_period_ps = period_ns * 1000; + ni_tio_set_sync_mode(counter); + return 0; +} + +static int ni_tio_get_clock_src(struct ni_gpct *counter, + unsigned int *clock_source, + unsigned int *period_ns) +{ + u64 temp64 = 0; + int ret; + + ret = ni_tio_generic_clock_src_select(counter, clock_source); + if (ret) + return ret; + ret = ni_tio_clock_period_ps(counter, *clock_source, &temp64); + if (ret) + return ret; + do_div(temp64, 1000); /* ps to ns */ + *period_ns = temp64; + return 0; +} + +static inline void ni_tio_set_gate_raw(struct ni_gpct *counter, + unsigned int gate_source) +{ + ni_tio_set_bits(counter, NITIO_INPUT_SEL_REG(counter->counter_index), + GI_GATE_SEL_MASK, GI_GATE_SEL(gate_source)); +} + +static inline void ni_tio_set_gate2_raw(struct ni_gpct *counter, + unsigned int gate_source) +{ + ni_tio_set_bits(counter, NITIO_GATE2_REG(counter->counter_index), + GI_GATE2_SEL_MASK, GI_GATE2_SEL(gate_source)); +} + +/* Set the mode bits for gate. */ +static inline void ni_tio_set_gate_mode(struct ni_gpct *counter, + unsigned int src) +{ + unsigned int mode_bits = 0; + + if (CR_CHAN(src) & NI_GPCT_DISABLED_GATE_SELECT) { + /* + * Allowing bitwise comparison here to allow non-zero raw + * register value to be used for channel when disabling. + */ + mode_bits = GI_GATING_DISABLED; + } else { + if (src & CR_INVERT) + mode_bits |= GI_GATE_POL_INVERT; + if (src & CR_EDGE) + mode_bits |= GI_RISING_EDGE_GATING; + else + mode_bits |= GI_LEVEL_GATING; + } + ni_tio_set_bits(counter, NITIO_MODE_REG(counter->counter_index), + GI_GATE_POL_INVERT | GI_GATING_MODE_MASK, + mode_bits); +} + +/* + * Set the mode bits for gate2. + * + * Previously, the code this function represents did not actually write anything + * to the register. Rather, writing to this register was reserved for the code + * ni ni_tio_set_gate2_raw. + */ +static inline void ni_tio_set_gate2_mode(struct ni_gpct *counter, + unsigned int src) +{ + /* + * The GI_GATE2_MODE bit was previously set in the code that also sets + * the gate2 source. + * We'll set mode bits _after_ source bits now, and thus, this function + * will effectively enable the second gate after all bits are set. + */ + unsigned int mode_bits = GI_GATE2_MODE; + + if (CR_CHAN(src) & NI_GPCT_DISABLED_GATE_SELECT) + /* + * Allowing bitwise comparison here to allow non-zero raw + * register value to be used for channel when disabling. + */ + mode_bits = GI_GATING_DISABLED; + if (src & CR_INVERT) + mode_bits |= GI_GATE2_POL_INVERT; + + ni_tio_set_bits(counter, NITIO_GATE2_REG(counter->counter_index), + GI_GATE2_POL_INVERT | GI_GATE2_MODE, mode_bits); +} + +static int ni_660x_set_gate(struct ni_gpct *counter, unsigned int gate_source) +{ + unsigned int chan = CR_CHAN(gate_source); + unsigned int gate_sel; + unsigned int i; + + switch (chan) { + case NI_GPCT_NEXT_SOURCE_GATE_SELECT: + gate_sel = NI_660X_NEXT_SRC_GATE_SEL; + break; + case NI_GPCT_NEXT_OUT_GATE_SELECT: + case NI_GPCT_LOGIC_LOW_GATE_SELECT: + case NI_GPCT_SOURCE_PIN_i_GATE_SELECT: + case NI_GPCT_GATE_PIN_i_GATE_SELECT: + gate_sel = chan & 0x1f; + break; + default: + for (i = 0; i <= NI_660X_MAX_RTSI_CHAN; ++i) { + if (chan == NI_GPCT_RTSI_GATE_SELECT(i)) { + gate_sel = chan & 0x1f; + break; + } + } + if (i <= NI_660X_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_660X_MAX_GATE_PIN; ++i) { + if (chan == NI_GPCT_GATE_PIN_GATE_SELECT(i)) { + gate_sel = chan & 0x1f; + break; + } + } + if (i <= NI_660X_MAX_GATE_PIN) + break; + return -EINVAL; + } + ni_tio_set_gate_raw(counter, gate_sel); + return 0; +} + +static int ni_m_set_gate(struct ni_gpct *counter, unsigned int gate_source) +{ + unsigned int chan = CR_CHAN(gate_source); + unsigned int gate_sel; + unsigned int i; + + switch (chan) { + case NI_GPCT_TIMESTAMP_MUX_GATE_SELECT: + case NI_GPCT_AI_START2_GATE_SELECT: + case NI_GPCT_PXI_STAR_TRIGGER_GATE_SELECT: + case NI_GPCT_NEXT_OUT_GATE_SELECT: + case NI_GPCT_AI_START1_GATE_SELECT: + case NI_GPCT_NEXT_SOURCE_GATE_SELECT: + case NI_GPCT_ANALOG_TRIGGER_OUT_GATE_SELECT: + case NI_GPCT_LOGIC_LOW_GATE_SELECT: + gate_sel = chan & 0x1f; + break; + default: + for (i = 0; i <= NI_M_MAX_RTSI_CHAN; ++i) { + if (chan == NI_GPCT_RTSI_GATE_SELECT(i)) { + gate_sel = chan & 0x1f; + break; + } + } + if (i <= NI_M_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_M_MAX_PFI_CHAN; ++i) { + if (chan == NI_GPCT_PFI_GATE_SELECT(i)) { + gate_sel = chan & 0x1f; + break; + } + } + if (i <= NI_M_MAX_PFI_CHAN) + break; + return -EINVAL; + } + ni_tio_set_gate_raw(counter, gate_sel); + return 0; +} + +static int ni_660x_set_gate2(struct ni_gpct *counter, unsigned int gate_source) +{ + unsigned int chan = CR_CHAN(gate_source); + unsigned int gate2_sel; + unsigned int i; + + switch (chan) { + case NI_GPCT_SOURCE_PIN_i_GATE_SELECT: + case NI_GPCT_UP_DOWN_PIN_i_GATE_SELECT: + case NI_GPCT_SELECTED_GATE_GATE_SELECT: + case NI_GPCT_NEXT_OUT_GATE_SELECT: + case NI_GPCT_LOGIC_LOW_GATE_SELECT: + gate2_sel = chan & 0x1f; + break; + case NI_GPCT_NEXT_SOURCE_GATE_SELECT: + gate2_sel = NI_660X_NEXT_SRC_GATE2_SEL; + break; + default: + for (i = 0; i <= NI_660X_MAX_RTSI_CHAN; ++i) { + if (chan == NI_GPCT_RTSI_GATE_SELECT(i)) { + gate2_sel = chan & 0x1f; + break; + } + } + if (i <= NI_660X_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_660X_MAX_UP_DOWN_PIN; ++i) { + if (chan == NI_GPCT_UP_DOWN_PIN_GATE_SELECT(i)) { + gate2_sel = chan & 0x1f; + break; + } + } + if (i <= NI_660X_MAX_UP_DOWN_PIN) + break; + return -EINVAL; + } + ni_tio_set_gate2_raw(counter, gate2_sel); + return 0; +} + +static int ni_m_set_gate2(struct ni_gpct *counter, unsigned int gate_source) +{ + /* + * FIXME: We don't know what the m-series second gate codes are, + * so we'll just pass the bits through for now. + */ + ni_tio_set_gate2_raw(counter, gate_source); + return 0; +} + +int ni_tio_set_gate_src_raw(struct ni_gpct *counter, + unsigned int gate, unsigned int src) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + + switch (gate) { + case 0: + /* 1. start by disabling gate */ + ni_tio_set_gate_mode(counter, NI_GPCT_DISABLED_GATE_SELECT); + /* 2. set the requested gate source */ + ni_tio_set_gate_raw(counter, src); + /* 3. reenable & set mode to starts things back up */ + ni_tio_set_gate_mode(counter, src); + break; + case 1: + if (!ni_tio_has_gate2_registers(counter_dev)) + return -EINVAL; + + /* 1. start by disabling gate */ + ni_tio_set_gate2_mode(counter, NI_GPCT_DISABLED_GATE_SELECT); + /* 2. set the requested gate source */ + ni_tio_set_gate2_raw(counter, src); + /* 3. reenable & set mode to starts things back up */ + ni_tio_set_gate2_mode(counter, src); + break; + default: + return -EINVAL; + } + return 0; +} +EXPORT_SYMBOL_GPL(ni_tio_set_gate_src_raw); + +int ni_tio_set_gate_src(struct ni_gpct *counter, + unsigned int gate, unsigned int src) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + /* + * mask off disable flag. This high bit still passes CR_CHAN. + * Doing this allows one to both set the gate as disabled, but also + * change the route value of the gate. + */ + int chan = CR_CHAN(src) & (~NI_GPCT_DISABLED_GATE_SELECT); + int ret; + + switch (gate) { + case 0: + /* 1. start by disabling gate */ + ni_tio_set_gate_mode(counter, NI_GPCT_DISABLED_GATE_SELECT); + /* 2. set the requested gate source */ + switch (counter_dev->variant) { + case ni_gpct_variant_e_series: + case ni_gpct_variant_m_series: + ret = ni_m_set_gate(counter, chan); + break; + case ni_gpct_variant_660x: + ret = ni_660x_set_gate(counter, chan); + break; + default: + return -EINVAL; + } + if (ret) + return ret; + /* 3. reenable & set mode to starts things back up */ + ni_tio_set_gate_mode(counter, src); + break; + case 1: + if (!ni_tio_has_gate2_registers(counter_dev)) + return -EINVAL; + + /* 1. start by disabling gate */ + ni_tio_set_gate2_mode(counter, NI_GPCT_DISABLED_GATE_SELECT); + /* 2. set the requested gate source */ + switch (counter_dev->variant) { + case ni_gpct_variant_m_series: + ret = ni_m_set_gate2(counter, chan); + break; + case ni_gpct_variant_660x: + ret = ni_660x_set_gate2(counter, chan); + break; + default: + return -EINVAL; + } + if (ret) + return ret; + /* 3. reenable & set mode to starts things back up */ + ni_tio_set_gate2_mode(counter, src); + break; + default: + return -EINVAL; + } + return 0; +} +EXPORT_SYMBOL_GPL(ni_tio_set_gate_src); + +static int ni_tio_set_other_src(struct ni_gpct *counter, unsigned int index, + unsigned int source) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + unsigned int chip = counter->chip_index; + unsigned int abz_reg, shift, mask; + + if (counter_dev->variant != ni_gpct_variant_m_series) + return -EINVAL; + + abz_reg = NITIO_ABZ_REG(cidx); + + /* allow for new device-global names */ + if (index == NI_GPCT_SOURCE_ENCODER_A || + (index >= NI_CtrA(0) && index <= NI_CtrA(-1))) { + shift = 10; + } else if (index == NI_GPCT_SOURCE_ENCODER_B || + (index >= NI_CtrB(0) && index <= NI_CtrB(-1))) { + shift = 5; + } else if (index == NI_GPCT_SOURCE_ENCODER_Z || + (index >= NI_CtrZ(0) && index <= NI_CtrZ(-1))) { + shift = 0; + } else { + return -EINVAL; + } + + mask = 0x1f << shift; + if (source > 0x1f) + source = 0x1f; /* Disable gate */ + + counter_dev->regs[chip][abz_reg] &= ~mask; + counter_dev->regs[chip][abz_reg] |= (source << shift) & mask; + ni_tio_write(counter, counter_dev->regs[chip][abz_reg], abz_reg); + return 0; +} + +static int ni_tio_get_other_src(struct ni_gpct *counter, unsigned int index, + unsigned int *source) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + unsigned int abz_reg, shift, mask; + + if (counter_dev->variant != ni_gpct_variant_m_series) + /* A,B,Z only valid for m-series */ + return -EINVAL; + + abz_reg = NITIO_ABZ_REG(cidx); + + /* allow for new device-global names */ + if (index == NI_GPCT_SOURCE_ENCODER_A || + (index >= NI_CtrA(0) && index <= NI_CtrA(-1))) { + shift = 10; + } else if (index == NI_GPCT_SOURCE_ENCODER_B || + (index >= NI_CtrB(0) && index <= NI_CtrB(-1))) { + shift = 5; + } else if (index == NI_GPCT_SOURCE_ENCODER_Z || + (index >= NI_CtrZ(0) && index <= NI_CtrZ(-1))) { + shift = 0; + } else { + return -EINVAL; + } + + mask = 0x1f; + + *source = (ni_tio_get_soft_copy(counter, abz_reg) >> shift) & mask; + return 0; +} + +static int ni_660x_gate_to_generic_gate(unsigned int gate, unsigned int *src) +{ + unsigned int source; + unsigned int i; + + switch (gate) { + case NI_660X_SRC_PIN_I_GATE_SEL: + source = NI_GPCT_SOURCE_PIN_i_GATE_SELECT; + break; + case NI_660X_GATE_PIN_I_GATE_SEL: + source = NI_GPCT_GATE_PIN_i_GATE_SELECT; + break; + case NI_660X_NEXT_SRC_GATE_SEL: + source = NI_GPCT_NEXT_SOURCE_GATE_SELECT; + break; + case NI_660X_NEXT_OUT_GATE_SEL: + source = NI_GPCT_NEXT_OUT_GATE_SELECT; + break; + case NI_660X_LOGIC_LOW_GATE_SEL: + source = NI_GPCT_LOGIC_LOW_GATE_SELECT; + break; + default: + for (i = 0; i <= NI_660X_MAX_RTSI_CHAN; ++i) { + if (gate == NI_660X_RTSI_GATE_SEL(i)) { + source = NI_GPCT_RTSI_GATE_SELECT(i); + break; + } + } + if (i <= NI_660X_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_660X_MAX_GATE_PIN; ++i) { + if (gate == NI_660X_PIN_GATE_SEL(i)) { + source = NI_GPCT_GATE_PIN_GATE_SELECT(i); + break; + } + } + if (i <= NI_660X_MAX_GATE_PIN) + break; + return -EINVAL; + } + *src = source; + return 0; +} + +static int ni_m_gate_to_generic_gate(unsigned int gate, unsigned int *src) +{ + unsigned int source; + unsigned int i; + + switch (gate) { + case NI_M_TIMESTAMP_MUX_GATE_SEL: + source = NI_GPCT_TIMESTAMP_MUX_GATE_SELECT; + break; + case NI_M_AI_START2_GATE_SEL: + source = NI_GPCT_AI_START2_GATE_SELECT; + break; + case NI_M_PXI_STAR_TRIGGER_GATE_SEL: + source = NI_GPCT_PXI_STAR_TRIGGER_GATE_SELECT; + break; + case NI_M_NEXT_OUT_GATE_SEL: + source = NI_GPCT_NEXT_OUT_GATE_SELECT; + break; + case NI_M_AI_START1_GATE_SEL: + source = NI_GPCT_AI_START1_GATE_SELECT; + break; + case NI_M_NEXT_SRC_GATE_SEL: + source = NI_GPCT_NEXT_SOURCE_GATE_SELECT; + break; + case NI_M_ANALOG_TRIG_OUT_GATE_SEL: + source = NI_GPCT_ANALOG_TRIGGER_OUT_GATE_SELECT; + break; + case NI_M_LOGIC_LOW_GATE_SEL: + source = NI_GPCT_LOGIC_LOW_GATE_SELECT; + break; + default: + for (i = 0; i <= NI_M_MAX_RTSI_CHAN; ++i) { + if (gate == NI_M_RTSI_GATE_SEL(i)) { + source = NI_GPCT_RTSI_GATE_SELECT(i); + break; + } + } + if (i <= NI_M_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_M_MAX_PFI_CHAN; ++i) { + if (gate == NI_M_PFI_GATE_SEL(i)) { + source = NI_GPCT_PFI_GATE_SELECT(i); + break; + } + } + if (i <= NI_M_MAX_PFI_CHAN) + break; + return -EINVAL; + } + *src = source; + return 0; +} + +static int ni_660x_gate2_to_generic_gate(unsigned int gate, unsigned int *src) +{ + unsigned int source; + unsigned int i; + + switch (gate) { + case NI_660X_SRC_PIN_I_GATE2_SEL: + source = NI_GPCT_SOURCE_PIN_i_GATE_SELECT; + break; + case NI_660X_UD_PIN_I_GATE2_SEL: + source = NI_GPCT_UP_DOWN_PIN_i_GATE_SELECT; + break; + case NI_660X_NEXT_SRC_GATE2_SEL: + source = NI_GPCT_NEXT_SOURCE_GATE_SELECT; + break; + case NI_660X_NEXT_OUT_GATE2_SEL: + source = NI_GPCT_NEXT_OUT_GATE_SELECT; + break; + case NI_660X_SELECTED_GATE2_SEL: + source = NI_GPCT_SELECTED_GATE_GATE_SELECT; + break; + case NI_660X_LOGIC_LOW_GATE2_SEL: + source = NI_GPCT_LOGIC_LOW_GATE_SELECT; + break; + default: + for (i = 0; i <= NI_660X_MAX_RTSI_CHAN; ++i) { + if (gate == NI_660X_RTSI_GATE2_SEL(i)) { + source = NI_GPCT_RTSI_GATE_SELECT(i); + break; + } + } + if (i <= NI_660X_MAX_RTSI_CHAN) + break; + for (i = 0; i <= NI_660X_MAX_UP_DOWN_PIN; ++i) { + if (gate == NI_660X_UD_PIN_GATE2_SEL(i)) { + source = NI_GPCT_UP_DOWN_PIN_GATE_SELECT(i); + break; + } + } + if (i <= NI_660X_MAX_UP_DOWN_PIN) + break; + return -EINVAL; + } + *src = source; + return 0; +} + +static int ni_m_gate2_to_generic_gate(unsigned int gate, unsigned int *src) +{ + /* + * FIXME: the second gate sources for the m series are undocumented, + * so we just return the raw bits for now. + */ + *src = gate; + return 0; +} + +static inline unsigned int ni_tio_get_gate_mode(struct ni_gpct *counter) +{ + unsigned int mode = ni_tio_get_soft_copy(counter, + NITIO_MODE_REG(counter->counter_index)); + unsigned int ret = 0; + + if ((mode & GI_GATING_MODE_MASK) == GI_GATING_DISABLED) + ret |= NI_GPCT_DISABLED_GATE_SELECT; + if (mode & GI_GATE_POL_INVERT) + ret |= CR_INVERT; + if ((mode & GI_GATING_MODE_MASK) != GI_LEVEL_GATING) + ret |= CR_EDGE; + + return ret; +} + +static inline unsigned int ni_tio_get_gate2_mode(struct ni_gpct *counter) +{ + unsigned int mode = ni_tio_get_soft_copy(counter, + NITIO_GATE2_REG(counter->counter_index)); + unsigned int ret = 0; + + if (!(mode & GI_GATE2_MODE)) + ret |= NI_GPCT_DISABLED_GATE_SELECT; + if (mode & GI_GATE2_POL_INVERT) + ret |= CR_INVERT; + + return ret; +} + +static inline unsigned int ni_tio_get_gate_val(struct ni_gpct *counter) +{ + return GI_BITS_TO_GATE(ni_tio_get_soft_copy(counter, + NITIO_INPUT_SEL_REG(counter->counter_index))); +} + +static inline unsigned int ni_tio_get_gate2_val(struct ni_gpct *counter) +{ + return GI_BITS_TO_GATE2(ni_tio_get_soft_copy(counter, + NITIO_GATE2_REG(counter->counter_index))); +} + +static int ni_tio_get_gate_src(struct ni_gpct *counter, unsigned int gate_index, + unsigned int *gate_source) +{ + unsigned int gate; + int ret; + + switch (gate_index) { + case 0: + gate = ni_tio_get_gate_val(counter); + switch (counter->counter_dev->variant) { + case ni_gpct_variant_e_series: + case ni_gpct_variant_m_series: + default: + ret = ni_m_gate_to_generic_gate(gate, gate_source); + break; + case ni_gpct_variant_660x: + ret = ni_660x_gate_to_generic_gate(gate, gate_source); + break; + } + if (ret) + return ret; + *gate_source |= ni_tio_get_gate_mode(counter); + break; + case 1: + gate = ni_tio_get_gate2_val(counter); + switch (counter->counter_dev->variant) { + case ni_gpct_variant_e_series: + case ni_gpct_variant_m_series: + default: + ret = ni_m_gate2_to_generic_gate(gate, gate_source); + break; + case ni_gpct_variant_660x: + ret = ni_660x_gate2_to_generic_gate(gate, gate_source); + break; + } + if (ret) + return ret; + *gate_source |= ni_tio_get_gate2_mode(counter); + break; + default: + return -EINVAL; + } + return 0; +} + +static int ni_tio_get_gate_src_raw(struct ni_gpct *counter, + unsigned int gate_index, + unsigned int *gate_source) +{ + switch (gate_index) { + case 0: + *gate_source = ni_tio_get_gate_mode(counter) + | ni_tio_get_gate_val(counter); + break; + case 1: + *gate_source = ni_tio_get_gate2_mode(counter) + | ni_tio_get_gate2_val(counter); + break; + default: + return -EINVAL; + } + return 0; +} + +int ni_tio_insn_config(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct ni_gpct *counter = s->private; + unsigned int cidx = counter->counter_index; + unsigned int status; + int ret = 0; + + switch (data[0]) { + case INSN_CONFIG_SET_COUNTER_MODE: + ret = ni_tio_set_counter_mode(counter, data[1]); + break; + case INSN_CONFIG_ARM: + ret = ni_tio_arm(counter, true, data[1]); + break; + case INSN_CONFIG_DISARM: + ret = ni_tio_arm(counter, false, 0); + break; + case INSN_CONFIG_GET_COUNTER_STATUS: + data[1] = 0; + status = ni_tio_read(counter, NITIO_SHARED_STATUS_REG(cidx)); + if (status & GI_ARMED(cidx)) { + data[1] |= COMEDI_COUNTER_ARMED; + if (status & GI_COUNTING(cidx)) + data[1] |= COMEDI_COUNTER_COUNTING; + } + data[2] = COMEDI_COUNTER_ARMED | COMEDI_COUNTER_COUNTING; + break; + case INSN_CONFIG_SET_CLOCK_SRC: + ret = ni_tio_set_clock_src(counter, data[1], data[2]); + break; + case INSN_CONFIG_GET_CLOCK_SRC: + ret = ni_tio_get_clock_src(counter, &data[1], &data[2]); + break; + case INSN_CONFIG_SET_GATE_SRC: + ret = ni_tio_set_gate_src(counter, data[1], data[2]); + break; + case INSN_CONFIG_GET_GATE_SRC: + ret = ni_tio_get_gate_src(counter, data[1], &data[2]); + break; + case INSN_CONFIG_SET_OTHER_SRC: + ret = ni_tio_set_other_src(counter, data[1], data[2]); + break; + case INSN_CONFIG_RESET: + ni_tio_reset_count_and_disarm(counter); + break; + default: + return -EINVAL; + } + return ret ? ret : insn->n; +} +EXPORT_SYMBOL_GPL(ni_tio_insn_config); + +/* + * Retrieves the register value of the current source of the output selector for + * the given destination. + * + * If the terminal for the destination is not already configured as an output, + * this function returns -EINVAL as error. + * + * Return: the register value of the destination output selector; + * -EINVAL if terminal is not configured for output. + */ +int ni_tio_get_routing(struct ni_gpct_device *counter_dev, unsigned int dest) +{ + /* we need to know the actual counter below... */ + int ctr_index = (dest - NI_COUNTER_NAMES_BASE) % NI_MAX_COUNTERS; + struct ni_gpct *counter = &counter_dev->counters[ctr_index]; + int ret = 1; + unsigned int reg; + + if (dest >= NI_CtrA(0) && dest <= NI_CtrZ(-1)) { + ret = ni_tio_get_other_src(counter, dest, ®); + } else if (dest >= NI_CtrGate(0) && dest <= NI_CtrGate(-1)) { + ret = ni_tio_get_gate_src_raw(counter, 0, ®); + } else if (dest >= NI_CtrAux(0) && dest <= NI_CtrAux(-1)) { + ret = ni_tio_get_gate_src_raw(counter, 1, ®); + /* + * This case is not possible through this interface. A user must use + * INSN_CONFIG_SET_CLOCK_SRC instead. + * } else if (dest >= NI_CtrSource(0) && dest <= NI_CtrSource(-1)) { + * ret = ni_tio_set_clock_src(counter, ®, &period_ns); + */ + } + + if (ret) + return -EINVAL; + + return reg; +} +EXPORT_SYMBOL_GPL(ni_tio_get_routing); + +/** + * ni_tio_set_routing() - Sets the register value of the selector MUX for the given destination. + * @counter_dev: Pointer to general counter device. + * @dest: Device-global identifier of route destination. + * @reg: + * The first several bits of this value should store the desired + * value to write to the register. All other bits are for + * transmitting information that modify the mode of the particular + * destination/gate. These mode bits might include a bitwise or of + * CR_INVERT and CR_EDGE. Note that the calling function should + * have already validated the correctness of this value. + */ +int ni_tio_set_routing(struct ni_gpct_device *counter_dev, unsigned int dest, + unsigned int reg) +{ + /* we need to know the actual counter below... */ + int ctr_index = (dest - NI_COUNTER_NAMES_BASE) % NI_MAX_COUNTERS; + struct ni_gpct *counter = &counter_dev->counters[ctr_index]; + int ret; + + if (dest >= NI_CtrA(0) && dest <= NI_CtrZ(-1)) { + ret = ni_tio_set_other_src(counter, dest, reg); + } else if (dest >= NI_CtrGate(0) && dest <= NI_CtrGate(-1)) { + ret = ni_tio_set_gate_src_raw(counter, 0, reg); + } else if (dest >= NI_CtrAux(0) && dest <= NI_CtrAux(-1)) { + ret = ni_tio_set_gate_src_raw(counter, 1, reg); + /* + * This case is not possible through this interface. A user must use + * INSN_CONFIG_SET_CLOCK_SRC instead. + * } else if (dest >= NI_CtrSource(0) && dest <= NI_CtrSource(-1)) { + * ret = ni_tio_set_clock_src(counter, reg, period_ns); + */ + } else { + return -EINVAL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(ni_tio_set_routing); + +/* + * Sets the given destination MUX to its default value or disable it. + * + * Return: 0 if successful; -EINVAL if terminal is unknown. + */ +int ni_tio_unset_routing(struct ni_gpct_device *counter_dev, unsigned int dest) +{ + if (dest >= NI_GATES_NAMES_BASE && dest <= NI_GATES_NAMES_MAX) + /* Disable gate (via mode bits) and set to default 0-value */ + return ni_tio_set_routing(counter_dev, dest, + NI_GPCT_DISABLED_GATE_SELECT); + /* + * This case is not possible through this interface. A user must use + * INSN_CONFIG_SET_CLOCK_SRC instead. + * if (dest >= NI_CtrSource(0) && dest <= NI_CtrSource(-1)) + * return ni_tio_set_clock_src(counter, reg, period_ns); + */ + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(ni_tio_unset_routing); + +static unsigned int ni_tio_read_sw_save_reg(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + struct ni_gpct *counter = s->private; + unsigned int cidx = counter->counter_index; + unsigned int val; + + ni_tio_set_bits(counter, NITIO_CMD_REG(cidx), GI_SAVE_TRACE, 0); + ni_tio_set_bits(counter, NITIO_CMD_REG(cidx), + GI_SAVE_TRACE, GI_SAVE_TRACE); + + /* + * The count doesn't get latched until the next clock edge, so it is + * possible the count may change (once) while we are reading. Since + * the read of the SW_Save_Reg isn't atomic (apparently even when it's + * a 32 bit register according to 660x docs), we need to read twice + * and make sure the reading hasn't changed. If it has, a third read + * will be correct since the count value will definitely have latched + * by then. + */ + val = ni_tio_read(counter, NITIO_SW_SAVE_REG(cidx)); + if (val != ni_tio_read(counter, NITIO_SW_SAVE_REG(cidx))) + val = ni_tio_read(counter, NITIO_SW_SAVE_REG(cidx)); + + return val; +} + +int ni_tio_insn_read(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct ni_gpct *counter = s->private; + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int channel = CR_CHAN(insn->chanspec); + unsigned int cidx = counter->counter_index; + unsigned int chip = counter->chip_index; + int i; + + for (i = 0; i < insn->n; i++) { + switch (channel) { + case 0: + data[i] = ni_tio_read_sw_save_reg(dev, s); + break; + case 1: + data[i] = + counter_dev->regs[chip][NITIO_LOADA_REG(cidx)]; + break; + case 2: + data[i] = + counter_dev->regs[chip][NITIO_LOADB_REG(cidx)]; + break; + } + } + return insn->n; +} +EXPORT_SYMBOL_GPL(ni_tio_insn_read); + +static unsigned int ni_tio_next_load_register(struct ni_gpct *counter) +{ + unsigned int cidx = counter->counter_index; + unsigned int bits = ni_tio_read(counter, NITIO_SHARED_STATUS_REG(cidx)); + + return (bits & GI_NEXT_LOAD_SRC(cidx)) + ? NITIO_LOADB_REG(cidx) + : NITIO_LOADA_REG(cidx); +} + +int ni_tio_insn_write(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct ni_gpct *counter = s->private; + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int channel = CR_CHAN(insn->chanspec); + unsigned int cidx = counter->counter_index; + unsigned int chip = counter->chip_index; + unsigned int load_reg; + unsigned int load_val; + + if (insn->n < 1) + return 0; + load_val = data[insn->n - 1]; + switch (channel) { + case 0: + /* + * Unsafe if counter is armed. + * Should probably check status and return -EBUSY if armed. + */ + + /* + * Don't disturb load source select, just use whichever + * load register is already selected. + */ + load_reg = ni_tio_next_load_register(counter); + ni_tio_write(counter, load_val, load_reg); + ni_tio_set_bits_transient(counter, NITIO_CMD_REG(cidx), + 0, 0, GI_LOAD); + /* restore load reg */ + ni_tio_write(counter, counter_dev->regs[chip][load_reg], + load_reg); + break; + case 1: + counter_dev->regs[chip][NITIO_LOADA_REG(cidx)] = load_val; + ni_tio_write(counter, load_val, NITIO_LOADA_REG(cidx)); + break; + case 2: + counter_dev->regs[chip][NITIO_LOADB_REG(cidx)] = load_val; + ni_tio_write(counter, load_val, NITIO_LOADB_REG(cidx)); + break; + default: + return -EINVAL; + } + return insn->n; +} +EXPORT_SYMBOL_GPL(ni_tio_insn_write); + +void ni_tio_init_counter(struct ni_gpct *counter) +{ + struct ni_gpct_device *counter_dev = counter->counter_dev; + unsigned int cidx = counter->counter_index; + unsigned int chip = counter->chip_index; + + ni_tio_reset_count_and_disarm(counter); + + /* initialize counter registers */ + counter_dev->regs[chip][NITIO_AUTO_INC_REG(cidx)] = 0x0; + ni_tio_write(counter, 0x0, NITIO_AUTO_INC_REG(cidx)); + + ni_tio_set_bits(counter, NITIO_CMD_REG(cidx), + ~0, GI_SYNC_GATE); + + ni_tio_set_bits(counter, NITIO_MODE_REG(cidx), ~0, 0); + + counter_dev->regs[chip][NITIO_LOADA_REG(cidx)] = 0x0; + ni_tio_write(counter, 0x0, NITIO_LOADA_REG(cidx)); + + counter_dev->regs[chip][NITIO_LOADB_REG(cidx)] = 0x0; + ni_tio_write(counter, 0x0, NITIO_LOADB_REG(cidx)); + + ni_tio_set_bits(counter, NITIO_INPUT_SEL_REG(cidx), ~0, 0); + + if (ni_tio_counting_mode_registers_present(counter_dev)) + ni_tio_set_bits(counter, NITIO_CNT_MODE_REG(cidx), ~0, 0); + + if (ni_tio_has_gate2_registers(counter_dev)) { + counter_dev->regs[chip][NITIO_GATE2_REG(cidx)] = 0x0; + ni_tio_write(counter, 0x0, NITIO_GATE2_REG(cidx)); + } + + ni_tio_set_bits(counter, NITIO_DMA_CFG_REG(cidx), ~0, 0x0); + + ni_tio_set_bits(counter, NITIO_INT_ENA_REG(cidx), ~0, 0x0); +} +EXPORT_SYMBOL_GPL(ni_tio_init_counter); + +struct ni_gpct_device * +ni_gpct_device_construct(struct comedi_device *dev, + void (*write)(struct ni_gpct *counter, + unsigned int value, + enum ni_gpct_register reg), + unsigned int (*read)(struct ni_gpct *counter, + enum ni_gpct_register reg), + enum ni_gpct_variant variant, + unsigned int num_counters, + unsigned int counters_per_chip, + const struct ni_route_tables *routing_tables) +{ + struct ni_gpct_device *counter_dev; + struct ni_gpct *counter; + unsigned int i; + + if (num_counters == 0 || counters_per_chip == 0) + return NULL; + + counter_dev = kzalloc(sizeof(*counter_dev), GFP_KERNEL); + if (!counter_dev) + return NULL; + + counter_dev->dev = dev; + counter_dev->write = write; + counter_dev->read = read; + counter_dev->variant = variant; + counter_dev->routing_tables = routing_tables; + + spin_lock_init(&counter_dev->regs_lock); + + counter_dev->num_counters = num_counters; + counter_dev->num_chips = DIV_ROUND_UP(num_counters, counters_per_chip); + + counter_dev->counters = kcalloc(num_counters, sizeof(*counter), + GFP_KERNEL); + counter_dev->regs = kcalloc(counter_dev->num_chips, + sizeof(*counter_dev->regs), GFP_KERNEL); + if (!counter_dev->regs || !counter_dev->counters) { + kfree(counter_dev->regs); + kfree(counter_dev->counters); + kfree(counter_dev); + return NULL; + } + + for (i = 0; i < num_counters; ++i) { + counter = &counter_dev->counters[i]; + counter->counter_dev = counter_dev; + counter->chip_index = i / counters_per_chip; + counter->counter_index = i % counters_per_chip; + spin_lock_init(&counter->lock); + } + + return counter_dev; +} +EXPORT_SYMBOL_GPL(ni_gpct_device_construct); + +void ni_gpct_device_destroy(struct ni_gpct_device *counter_dev) +{ + if (!counter_dev) + return; + kfree(counter_dev->regs); + kfree(counter_dev->counters); + kfree(counter_dev); +} +EXPORT_SYMBOL_GPL(ni_gpct_device_destroy); + +static int __init ni_tio_init_module(void) +{ + return 0; +} +module_init(ni_tio_init_module); + +static void __exit ni_tio_cleanup_module(void) +{ +} +module_exit(ni_tio_cleanup_module); + +MODULE_AUTHOR("Comedi <comedi@comedi.org>"); +MODULE_DESCRIPTION("Comedi support for NI general-purpose counters"); +MODULE_LICENSE("GPL"); |