From 5a213fa6f7c33219300bdd826d77172bfd5a54e6 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Tue, 24 Feb 2015 10:38:49 -0700 Subject: [PATCH] staging: comedi: amplc_dio200_common: convert driver to use the comedi_8254 module 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 Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/Kconfig | 1 + .../comedi/drivers/amplc_dio200_common.c | 295 ++++++------------ drivers/staging/comedi/drivers/comedi_8254.h | 4 + 3 files changed, 99 insertions(+), 201 deletions(-) diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig index 6ee50b481088..ebda03cd308d 100644 --- a/drivers/staging/comedi/Kconfig +++ b/drivers/staging/comedi/Kconfig @@ -1275,6 +1275,7 @@ config COMEDI_KCOMEDILIB called kcomedilib. config COMEDI_AMPLC_DIO200 + select COMEDI_8254 tristate config COMEDI_AMPLC_PC236 diff --git a/drivers/staging/comedi/drivers/amplc_dio200_common.c b/drivers/staging/comedi/drivers/amplc_dio200_common.c index 08dab1fd91f2..0101e92667a1 100644 --- a/drivers/staging/comedi/drivers/amplc_dio200_common.c +++ b/drivers/staging/comedi/drivers/amplc_dio200_common.c @@ -26,7 +26,7 @@ #include "amplc_dio200.h" #include "comedi_fc.h" -#include "8253.h" +#include "comedi_8254.h" #include "8255.h" /* only for register defines */ /* 200 series registers */ @@ -97,12 +97,6 @@ static const unsigned int ts_clock_period[TS_CONFIG_MAX_CLK_SRC + 1] = { 1000000, /* 1 millisecond. */ }; -struct dio200_subdev_8254 { - unsigned int ofs; /* Counter base offset */ - unsigned int clock_src[3]; /* Current clock sources */ - unsigned int gate_src[3]; /* Current gate sources */ -}; - struct dio200_subdev_8255 { unsigned int ofs; /* DIO base offset */ }; @@ -169,6 +163,27 @@ static void dio200_write32(struct comedi_device *dev, outl(val, dev->iobase + offset); } +static unsigned int dio200_subdev_8254_offset(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + const struct dio200_board *board = dev->board_ptr; + struct comedi_8254 *i8254 = s->private; + unsigned int offset; + + /* get the offset that was passed to comedi_8254_*_init() */ + if (dev->mmio) + offset = i8254->mmio - dev->mmio; + else + offset = i8254->iobase - dev->iobase; + + /* remove the shift that was added for PCIe boards */ + if (board->is_pcie) + offset >>= 3; + + /* this offset now works for the dio200_{read,write} helpers */ + return offset; +} + static int dio200_subdev_intr_insn_bits(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, @@ -474,159 +489,26 @@ static irqreturn_t dio200_interrupt(int irq, void *d) return IRQ_RETVAL(handled); } -static unsigned int dio200_subdev_8254_read_chan(struct comedi_device *dev, - struct comedi_subdevice *s, - unsigned int chan) -{ - struct dio200_subdev_8254 *subpriv = s->private; - unsigned int val; - - /* latch counter */ - val = chan << 6; - dio200_write8(dev, subpriv->ofs + i8254_control_reg, val); - /* read lsb, msb */ - val = dio200_read8(dev, subpriv->ofs + chan); - val += dio200_read8(dev, subpriv->ofs + chan) << 8; - return val; -} - -static void dio200_subdev_8254_write_chan(struct comedi_device *dev, - struct comedi_subdevice *s, - unsigned int chan, - unsigned int count) -{ - struct dio200_subdev_8254 *subpriv = s->private; - - /* write lsb, msb */ - dio200_write8(dev, subpriv->ofs + chan, count & 0xff); - dio200_write8(dev, subpriv->ofs + chan, (count >> 8) & 0xff); -} - -static void dio200_subdev_8254_set_mode(struct comedi_device *dev, - struct comedi_subdevice *s, - unsigned int chan, - unsigned int mode) -{ - struct dio200_subdev_8254 *subpriv = s->private; - unsigned int byte; - - byte = chan << 6; - byte |= 0x30; /* access order: lsb, msb */ - byte |= (mode & 0xf); /* counter mode and BCD|binary */ - dio200_write8(dev, subpriv->ofs + i8254_control_reg, byte); -} - -static unsigned int dio200_subdev_8254_status(struct comedi_device *dev, - struct comedi_subdevice *s, - unsigned int chan) -{ - struct dio200_subdev_8254 *subpriv = s->private; - - /* latch status */ - dio200_write8(dev, subpriv->ofs + i8254_control_reg, - 0xe0 | (2 << chan)); - /* read status */ - return dio200_read8(dev, subpriv->ofs + chan); -} - -static int dio200_subdev_8254_read(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, - unsigned int *data) -{ - int chan = CR_CHAN(insn->chanspec); - unsigned int n; - - for (n = 0; n < insn->n; n++) - data[n] = dio200_subdev_8254_read_chan(dev, s, chan); - - return insn->n; -} - -static int dio200_subdev_8254_write(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_insn *insn, - unsigned int *data) -{ - int chan = CR_CHAN(insn->chanspec); - unsigned int n; - - for (n = 0; n < insn->n; n++) - dio200_subdev_8254_write_chan(dev, s, chan, data[n]); - - return insn->n; -} - -static int dio200_subdev_8254_set_gate_src(struct comedi_device *dev, - struct comedi_subdevice *s, - unsigned int counter_number, - unsigned int gate_src) -{ - const struct dio200_board *board = dev->board_ptr; - struct dio200_subdev_8254 *subpriv = s->private; - unsigned char byte; - - if (!board->has_clk_gat_sce) - return -1; - if (gate_src > (board->is_pcie ? 31 : 7)) - return -1; - - subpriv->gate_src[counter_number] = gate_src; - byte = gat_sce((subpriv->ofs >> 2) & 1, counter_number, gate_src); - dio200_write8(dev, DIO200_GAT_SCE(subpriv->ofs >> 3), byte); - - return 0; -} - -static int dio200_subdev_8254_get_gate_src(struct comedi_device *dev, - struct comedi_subdevice *s, - unsigned int counter_number) -{ - const struct dio200_board *board = dev->board_ptr; - struct dio200_subdev_8254 *subpriv = s->private; - - if (!board->has_clk_gat_sce) - return -1; - - return subpriv->gate_src[counter_number]; -} - -static int dio200_subdev_8254_set_clock_src(struct comedi_device *dev, +static void dio200_subdev_8254_set_gate_src(struct comedi_device *dev, struct comedi_subdevice *s, - unsigned int counter_number, - unsigned int clock_src) + unsigned int chan, + unsigned int src) { - const struct dio200_board *board = dev->board_ptr; - struct dio200_subdev_8254 *subpriv = s->private; - unsigned char byte; - - if (!board->has_clk_gat_sce) - return -1; - if (clock_src > (board->is_pcie ? 31 : 7)) - return -1; - - subpriv->clock_src[counter_number] = clock_src; - byte = clk_sce((subpriv->ofs >> 2) & 1, counter_number, clock_src); - dio200_write8(dev, DIO200_CLK_SCE(subpriv->ofs >> 3), byte); + unsigned int offset = dio200_subdev_8254_offset(dev, s); - return 0; + dio200_write8(dev, DIO200_GAT_SCE(offset >> 3), + gat_sce((offset >> 2) & 1, chan, src)); } -static int dio200_subdev_8254_get_clock_src(struct comedi_device *dev, - struct comedi_subdevice *s, - unsigned int counter_number, - unsigned int *period_ns) +static void dio200_subdev_8254_set_clock_src(struct comedi_device *dev, + struct comedi_subdevice *s, + unsigned int chan, + unsigned int src) { - const struct dio200_board *board = dev->board_ptr; - struct dio200_subdev_8254 *subpriv = s->private; - unsigned clock_src; - - if (!board->has_clk_gat_sce) - return -1; + unsigned int offset = dio200_subdev_8254_offset(dev, s); - clock_src = subpriv->clock_src[counter_number]; - *period_ns = clock_period[clock_src]; - return clock_src; + dio200_write8(dev, DIO200_CLK_SCE(offset >> 3), + clk_sce((offset >> 2) & 1, chan, src)); } static int dio200_subdev_8254_config(struct comedi_device *dev, @@ -634,51 +516,44 @@ static int dio200_subdev_8254_config(struct comedi_device *dev, struct comedi_insn *insn, unsigned int *data) { - int ret = 0; - int chan = CR_CHAN(insn->chanspec); + const struct dio200_board *board = dev->board_ptr; + struct comedi_8254 *i8254 = s->private; + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int max_src = board->is_pcie ? 31 : 7; + unsigned int src; + + if (!board->has_clk_gat_sce) + return -EINVAL; switch (data[0]) { - case INSN_CONFIG_SET_COUNTER_MODE: - if (data[1] > (I8254_MODE5 | I8254_BCD)) - ret = -EINVAL; - else - dio200_subdev_8254_set_mode(dev, s, chan, data[1]); - break; - case INSN_CONFIG_8254_READ_STATUS: - data[1] = dio200_subdev_8254_status(dev, s, chan); - break; case INSN_CONFIG_SET_GATE_SRC: - ret = dio200_subdev_8254_set_gate_src(dev, s, chan, data[2]); - if (ret < 0) - ret = -EINVAL; + src = data[2]; + if (src > max_src) + return -EINVAL; + + dio200_subdev_8254_set_gate_src(dev, s, chan, src); + i8254->gate_src[chan] = src; break; case INSN_CONFIG_GET_GATE_SRC: - ret = dio200_subdev_8254_get_gate_src(dev, s, chan); - if (ret < 0) { - ret = -EINVAL; - break; - } - data[2] = ret; + data[2] = i8254->gate_src[chan]; break; case INSN_CONFIG_SET_CLOCK_SRC: - ret = dio200_subdev_8254_set_clock_src(dev, s, chan, data[1]); - if (ret < 0) - ret = -EINVAL; + src = data[1]; + if (src > max_src) + return -EINVAL; + + dio200_subdev_8254_set_clock_src(dev, s, chan, src); + i8254->clock_src[chan] = src; break; case INSN_CONFIG_GET_CLOCK_SRC: - ret = dio200_subdev_8254_get_clock_src(dev, s, chan, &data[2]); - if (ret < 0) { - ret = -EINVAL; - break; - } - data[1] = ret; + data[1] = i8254->clock_src[chan]; + data[2] = clock_period[i8254->clock_src[chan]]; break; default: - ret = -EINVAL; - break; + return -EINVAL; } - return ret < 0 ? ret : insn->n; + return insn->n; } static int dio200_subdev_8254_init(struct comedi_device *dev, @@ -686,28 +561,46 @@ 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; + + /* + * PCIe boards need the offset shifted in order to get the + * correct base address of the timer. + */ + if (board->is_pcie) { + offset <<= 3; + regshift = 3; + } else { + regshift = 0; + } - subpriv = comedi_alloc_spriv(s, sizeof(*subpriv)); - if (!subpriv) + 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); + if (!i8254) return -ENOMEM; - s->type = COMEDI_SUBD_COUNTER; - s->subdev_flags = SDF_WRITABLE | SDF_READABLE; - s->n_chan = 3; - s->maxdata = 0xFFFF; - s->insn_read = dio200_subdev_8254_read; - s->insn_write = dio200_subdev_8254_write; - s->insn_config = dio200_subdev_8254_config; + comedi_8254_subdevice_init(s, i8254); - subpriv->ofs = offset; + i8254->insn_config = dio200_subdev_8254_config; + + /* + * There could be multiple timers so this driver does not + * use dev->pacer to save the i8254 pointer. Instead, + * comedi_8254_subdevice_init() saved the i8254 pointer in + * s->private. Set the runflag bit so that the core will + * automatically free it when the driver is detached. + */ + s->runflags |= COMEDI_SRF_FREE_SPRIV; /* Initialize channels. */ - for (chan = 0; chan < 3; chan++) { - dio200_subdev_8254_set_mode(dev, s, chan, - I8254_MODE0 | I8254_BINARY); - if (board->has_clk_gat_sce) { + if (board->has_clk_gat_sce) { + for (chan = 0; chan < 3; chan++) { /* Gate source 0 is VCC (logic 1). */ dio200_subdev_8254_set_gate_src(dev, s, chan, 0); /* Clock source 0 is the dedicated clock input. */ diff --git a/drivers/staging/comedi/drivers/comedi_8254.h b/drivers/staging/comedi/drivers/comedi_8254.h index 54f2bf8d5bf6..d89f6d94f8aa 100644 --- a/drivers/staging/comedi/drivers/comedi_8254.h +++ b/drivers/staging/comedi/drivers/comedi_8254.h @@ -71,6 +71,8 @@ * #next_div: next divisor for single counter * @next_div1: next divisor to use for first cascaded counter * @next_div2: next divisor to use for second cascaded counter + * @clock_src; current clock source for each counter (driver specific) + * @gate_src; current gate source for each counter (driver specific) * @busy: flags used to indicate that a counter is "busy" * @insn_config: driver specific (*insn_config) callback */ @@ -86,6 +88,8 @@ struct comedi_8254 { unsigned int next_div; unsigned int next_div1; unsigned int next_div2; + unsigned int clock_src[3]; + unsigned int gate_src[3]; bool busy[3]; int (*insn_config)(struct comedi_device *, struct comedi_subdevice *s, -- 2.30.2