staging: comedi: ni_670x: remove COMEDI_MITE and HAS_DMA dependancy

The mite module provides the DMA interface for the PCI MITE ASIC used on
many National Instruments DAQ boards. This driver does not use DMA and only
depends on the mite module to initialize the MITE ASIC.

Handle the initialization localy and remove the unnecessary dependancies.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/Kconfig

@@ -1037,8 +1037,6 @@ config COMEDI_NI_660X
 
 config COMEDI_NI_670X
 	tristate "NI 670x PCI card support"
-	depends on HAS_DMA
-	select COMEDI_MITE
 	---help---
 	  Enable support for National Instruments PCI-6703 and PCI-6704
 

drivers/staging/comedi/drivers/ni_670x.c

@@ -42,8 +42,6 @@ Commands are not supported.
 
 #include "../comedidev.h"
 
-#include "mite.h"
-
 #define AO_VALUE_OFFSET			0x00
 #define	AO_CHAN_OFFSET			0x0c
 #define	AO_STATUS_OFFSET		0x10
@@ -82,8 +80,7 @@ static const struct ni_670x_board ni_670x_boards[] = {
 };
 
 struct ni_670x_private {
-
-	struct mite_struct *mite;
+	void __iomem *mmio;
 	int boardtype;
 	int dio;
 	unsigned int ao_readback[32];
@@ -111,9 +108,9 @@ static int ni_670x_ao_winsn(struct comedi_device *dev,
 	for (i = 0; i < insn->n; i++) {
 		/* First write in channel register which channel to use */
 		writel(((chan & 15) << 1) | ((chan & 16) >> 4),
-		       devpriv->mite->daq_io_addr + AO_CHAN_OFFSET);
+		       devpriv->mmio + AO_CHAN_OFFSET);
 		/* write channel value */
-		writel(data[i], devpriv->mite->daq_io_addr + AO_VALUE_OFFSET);
+		writel(data[i], devpriv->mmio + AO_VALUE_OFFSET);
 		devpriv->ao_readback[chan] = data[i];
 	}
 
@@ -140,8 +137,7 @@ static int ni_670x_dio_insn_bits(struct comedi_device *dev,
 				 unsigned int *data)
 {
 	struct ni_670x_private *devpriv = dev->private;
-	void __iomem *io_addr = devpriv->mite->daq_io_addr +
-					DIO_PORT0_DATA_OFFSET;
+	void __iomem *io_addr = devpriv->mmio + DIO_PORT0_DATA_OFFSET;
 
 	if (comedi_dio_update_state(s, data))
 		writel(s->state, io_addr);
@@ -163,11 +159,34 @@ static int ni_670x_dio_insn_config(struct comedi_device *dev,
 	if (ret)
 		return ret;
 
-	writel(s->io_bits, devpriv->mite->daq_io_addr + DIO_PORT0_DIR_OFFSET);
+	writel(s->io_bits, devpriv->mmio + DIO_PORT0_DIR_OFFSET);
 
 	return insn->n;
 }
 
+/* ripped from mite.h and mite_setup2() to avoid mite dependancy */
+#define MITE_IODWBSR	0xc0	 /* IO Device Window Base Size Register */
+#define WENAB		(1 << 7) /* window enable */
+
+static int ni_670x_mite_init(struct pci_dev *pcidev)
+{
+	void __iomem *mite_base;
+	u32 main_phys_addr;
+
+	/* ioremap the MITE registers (BAR 0) temporarily */
+	mite_base = pci_ioremap_bar(pcidev, 0);
+	if (!mite_base)
+		return -ENOMEM;
+
+	/* set data window to main registers (BAR 1) */
+	main_phys_addr = pci_resource_start(pcidev, 1);
+	writel(main_phys_addr | WENAB, mite_base + MITE_IODWBSR);
+
+	/* finished with MITE registers */
+	iounmap(mite_base);
+	return 0;
+}
+
 static int ni_670x_auto_attach(struct comedi_device *dev,
 			       unsigned long context)
 {
@@ -193,15 +212,13 @@ static int ni_670x_auto_attach(struct comedi_device *dev,
 	if (!devpriv)
 		return -ENOMEM;
 
-	devpriv->mite = mite_alloc(pcidev);
-	if (!devpriv->mite)
-		return -ENOMEM;
-
-	ret = mite_setup(devpriv->mite);
-	if (ret < 0) {
-		dev_warn(dev->class_dev, "error setting up mite\n");
+	ret = ni_670x_mite_init(pcidev);
+	if (ret)
 		return ret;
-	}
+
+	devpriv->mmio = pci_ioremap_bar(pcidev, 1);
+	if (!devpriv->mmio)
+		return -ENOMEM;
 
 	ret = comedi_alloc_subdevices(dev, 2);
 	if (ret)
@@ -242,9 +259,9 @@ static int ni_670x_auto_attach(struct comedi_device *dev,
 	s->insn_config = ni_670x_dio_insn_config;
 
 	/* Config of misc registers */
-	writel(0x10, devpriv->mite->daq_io_addr + MISC_CONTROL_OFFSET);
+	writel(0x10, devpriv->mmio + MISC_CONTROL_OFFSET);
 	/* Config of ao registers */
-	writel(0x00, devpriv->mite->daq_io_addr + AO_CONTROL_OFFSET);
+	writel(0x00, devpriv->mmio + AO_CONTROL_OFFSET);
 
 	return 0;
 }
@@ -259,8 +276,8 @@ static void ni_670x_detach(struct comedi_device *dev)
 		if (s)
 			kfree(s->range_table_list);
 	}
-	if (devpriv)
-		mite_detach(devpriv->mite);
+	if (devpriv && devpriv->mmio)
+		iounmap(devpriv->mmio);
 	comedi_pci_disable(dev);
 }