From bc86e82d346320d036961da5a2f35a2cbc7e00cf Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Thu, 24 Sep 2015 17:52:12 -0700 Subject: [PATCH] staging: comedi: rtd520: hook up 8254 timer/counter subdevice There is a standard 8254 Timer/Counter device on the board. Hook up the subdevice for the user. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/Kconfig | 1 + drivers/staging/comedi/drivers/rtd520.c | 112 +++++++++++++++++++----- 2 files changed, 92 insertions(+), 21 deletions(-) diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig index 682987eaf6e4..a5f2a3e45f26 100644 --- a/drivers/staging/comedi/Kconfig +++ b/drivers/staging/comedi/Kconfig @@ -1064,6 +1064,7 @@ config COMEDI_NI_PCIMIO config COMEDI_RTD520 tristate "Real Time Devices PCI4520/DM7520 support" + select COMEDI_8254 ---help--- Enable support for Real Time Devices PCI4520/DM7520 diff --git a/drivers/staging/comedi/drivers/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c index 96c419374c9d..68ac02b68cb2 100644 --- a/drivers/staging/comedi/drivers/rtd520.c +++ b/drivers/staging/comedi/drivers/rtd520.c @@ -72,8 +72,6 @@ * As far as I can tell, the About interrupt doesn't work if Sample is * also enabled. It turns out that About really isn't needed, since * we always count down samples read. - * - * There was some timer/counter code, but it didn't follow the right API. */ /* @@ -99,6 +97,7 @@ #include "../comedi_pci.h" +#include "comedi_8254.h" #include "plx9080.h" /* @@ -148,10 +147,7 @@ #define LAS0_DCNT 0x0054 /* Delay counter (16 bit) */ #define LAS0_ACNT 0x0058 /* About counter (16 bit) */ #define LAS0_DAC_CLK 0x005c /* DAC clock (16bit) */ -#define LAS0_UTC0 0x0060 /* 8254 TC Counter 0 */ -#define LAS0_UTC1 0x0064 /* 8254 TC Counter 1 */ -#define LAS0_UTC2 0x0068 /* 8254 TC Counter 2 */ -#define LAS0_UTC_CTRL 0x006c /* 8254 TC Control */ +#define LAS0_8254_TIMER_BASE 0x0060 /* 8254 timer/counter base */ #define LAS0_DIO0 0x0070 /* Digital I/O Port 0 */ #define LAS0_DIO1 0x0074 /* Digital I/O Port 1 */ #define LAS0_DIO0_CTRL 0x0078 /* Digital I/O Control */ @@ -191,12 +187,8 @@ #define LAS0_SBUS2_ENABLE 0x019c /* SyncBus 2 enable */ #define LAS0_ETRG_POLARITY 0x01a4 /* Ext. Trigger polarity select */ #define LAS0_EINT_POLARITY 0x01a8 /* Ext. Interrupt polarity select */ -#define LAS0_UTC0_CLOCK 0x01ac /* UTC0 Clock select */ -#define LAS0_UTC0_GATE 0x01b0 /* UTC0 Gate select */ -#define LAS0_UTC1_CLOCK 0x01b4 /* UTC1 Clock select */ -#define LAS0_UTC1_GATE 0x01b8 /* UTC1 Gate select */ -#define LAS0_UTC2_CLOCK 0x01bc /* UTC2 Clock select */ -#define LAS0_UTC2_GATE 0x01c0 /* UTC2 Gate select */ +#define LAS0_8254_CLK_SEL(x) (0x01ac + ((x) * 0x8)) /* 8254 clock select */ +#define LAS0_8254_GATE_SEL(x) (0x01b0 + ((x) * 0x8)) /* 8254 gate select */ #define LAS0_UOUT0_SELECT 0x01c4 /* User Output 0 source select */ #define LAS0_UOUT1_SELECT 0x01c8 /* User Output 1 source select */ #define LAS0_DMA0_RESET 0x01cc /* DMA0 Request state machine reset */ @@ -371,6 +363,10 @@ struct rtd_private { int xfer_count; /* # to transfer data. 0->1/2FIFO */ int flags; /* flag event modes */ unsigned fifosz; + + /* 8254 Timer/Counter gate and clock sources */ + unsigned char timer_gate_src[3]; + unsigned char timer_clk_src[3]; }; /* bit defines for "flags" */ @@ -1099,6 +1095,81 @@ static int rtd_dio_insn_config(struct comedi_device *dev, return insn->n; } +static int rtd_counter_insn_config(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct rtd_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int max_src; + unsigned int src; + + switch (data[0]) { + case INSN_CONFIG_SET_GATE_SRC: + /* + * 8254 Timer/Counter gate sources: + * + * 0 = Not gated, free running (reset state) + * 1 = Gated, off + * 2 = Ext. TC Gate 1 + * 3 = Ext. TC Gate 2 + * 4 = Previous TC out (chan 1 and 2 only) + */ + src = data[2]; + max_src = (chan == 0) ? 3 : 4; + if (src > max_src) + return -EINVAL; + + devpriv->timer_gate_src[chan] = src; + writeb(src, dev->mmio + LAS0_8254_GATE_SEL(chan)); + break; + case INSN_CONFIG_GET_GATE_SRC: + data[2] = devpriv->timer_gate_src[chan]; + break; + case INSN_CONFIG_SET_CLOCK_SRC: + /* + * 8254 Timer/Counter clock sources: + * + * 0 = 8 MHz (reset state) + * 1 = Ext. TC Clock 1 + * 2 = Ext. TX Clock 2 + * 3 = Ext. Pacer Clock + * 4 = Previous TC out (chan 1 and 2 only) + * 5 = High-Speed Digital Input Sampling signal (chan 1 only) + */ + src = data[1]; + switch (chan) { + case 0: + max_src = 3; + break; + case 1: + max_src = 5; + break; + case 2: + max_src = 4; + break; + default: + return -EINVAL; + } + if (src > max_src) + return -EINVAL; + + devpriv->timer_clk_src[chan] = src; + writeb(src, dev->mmio + LAS0_8254_CLK_SEL(chan)); + break; + case INSN_CONFIG_GET_CLOCK_SRC: + src = devpriv->timer_clk_src[chan]; + data[1] = devpriv->timer_clk_src[chan]; + data[2] = (src == 0) ? RTD_CLOCK_BASE : 0; + break; + default: + return -EINVAL; + } + + return insn->n; +} + static void rtd_reset(struct comedi_device *dev) { struct rtd_private *devpriv = dev->private; @@ -1126,10 +1197,6 @@ static void rtd_init_board(struct comedi_device *dev) writel(0, dev->mmio + LAS0_DAC_RESET(1)); /* clear digital IO fifo */ writew(0, dev->mmio + LAS0_DIO_STATUS); - writeb((0 << 6) | 0x30, dev->mmio + LAS0_UTC_CTRL); - writeb((1 << 6) | 0x30, dev->mmio + LAS0_UTC_CTRL); - writeb((2 << 6) | 0x30, dev->mmio + LAS0_UTC_CTRL); - writeb((3 << 6) | 0x00, dev->mmio + LAS0_UTC_CTRL); /* TODO: set user out source ??? */ } @@ -1232,12 +1299,15 @@ static int rtd_auto_attach(struct comedi_device *dev, s->insn_bits = rtd_dio_insn_bits; s->insn_config = rtd_dio_insn_config; - /* timer/counter subdevices (not currently supported) */ + /* 8254 Timer/Counter subdevice */ s = &dev->subdevices[3]; - s->type = COMEDI_SUBD_COUNTER; - s->subdev_flags = SDF_READABLE | SDF_WRITABLE; - s->n_chan = 3; - s->maxdata = 0xffff; + dev->pacer = comedi_8254_mm_init(dev->mmio + LAS0_8254_TIMER_BASE, + RTD_CLOCK_BASE, I8254_IO8, 2); + if (!dev->pacer) + return -ENOMEM; + + comedi_8254_subdevice_init(s, dev->pacer); + dev->pacer->insn_config = rtd_counter_insn_config; rtd_init_board(dev); -- 2.30.2