drivers/mfd/janz-cmodio.c - arm/linux-arm-legacy - Git at Google

 /*
  * Janz CMOD-IO MODULbus Carrier Board PCI Driver
  *
  * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
  *
  * Lots of inspiration and code was copied from drivers/mfd/sm501.c
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
  * Free Software Foundation; either version 2 of the License, or (at your
  * option) any later version.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/mfd/core.h>

 #include <linux/mfd/janz.h>

 #define DRV_NAME "janz-cmodio"

 /* Size of each MODULbus module in PCI BAR4 */
 #define CMODIO_MODULBUS_SIZE	0x200

 /* Maximum number of MODULbus modules on a CMOD-IO carrier board */
 #define CMODIO_MAX_MODULES	4

 /* Module Parameters */
 static unsigned int num_modules = CMODIO_MAX_MODULES;
 static char *modules[CMODIO_MAX_MODULES] = {
 	"empty", "empty", "empty", "empty",
 };

 module_param_array(modules, charp, &num_modules, S_IRUGO);
 MODULE_PARM_DESC(modules, "MODULbus modules attached to the carrier board");

 /* Unique Device Id */
 static unsigned int cmodio_id;

 struct cmodio_device {
 	/* Parent PCI device */
 	struct pci_dev *pdev;

 	/* PLX control registers */
 	struct janz_cmodio_onboard_regs __iomem *ctrl;

 	/* hex switch position */
 	u8 hex;

 	/* mfd-core API */
 	struct mfd_cell cells[CMODIO_MAX_MODULES];
 	struct resource resources[3 * CMODIO_MAX_MODULES];
 	struct janz_platform_data pdata[CMODIO_MAX_MODULES];
 };

 /*
  * Subdevices using the mfd-core API
  */

 static int cmodio_setup_subdevice(struct cmodio_device *priv,
 					    char *name, unsigned int devno,
 					    unsigned int modno)
 {
 	struct janz_platform_data *pdata;
 	struct mfd_cell *cell;
 	struct resource *res;
 	struct pci_dev *pci;

 	pci = priv->pdev;
 	cell = &priv->cells[devno];
 	res = &priv->resources[devno * 3];
 	pdata = &priv->pdata[devno];

 	cell->name = name;
 	cell->resources = res;
 	cell->num_resources = 3;

 	/* Setup the subdevice ID -- must be unique */
 	cell->id = cmodio_id++;

 	/* Add platform data */
 	pdata->modno = modno;
 	cell->platform_data = pdata;
 	cell->pdata_size = sizeof(*pdata);

 	/* MODULbus registers -- PCI BAR3 is big-endian MODULbus access */
 	res->flags = IORESOURCE_MEM;
 	res->parent = &pci->resource[3];
 	res->start = pci->resource[3].start + (CMODIO_MODULBUS_SIZE * modno);
 	res->end = res->start + CMODIO_MODULBUS_SIZE - 1;
 	res++;

 	/* PLX Control Registers -- PCI BAR4 is interrupt and other registers */
 	res->flags = IORESOURCE_MEM;
 	res->parent = &pci->resource[4];
 	res->start = pci->resource[4].start;
 	res->end = pci->resource[4].end;
 	res++;

 	/*
 	 * IRQ
 	 *
 	 * The start and end fields are used as an offset to the irq_base
 	 * parameter passed into the mfd_add_devices() function call. All
 	 * devices share the same IRQ.
 	 */
 	res->flags = IORESOURCE_IRQ;
 	res->parent = NULL;
 	res->start = 0;
 	res->end = 0;
 	res++;

 	return 0;
 }

 /* Probe each submodule using kernel parameters */
 static int cmodio_probe_submodules(struct cmodio_device *priv)
 {
 	struct pci_dev *pdev = priv->pdev;
 	unsigned int num_probed = 0;
 	char *name;
 	int i;

 	for (i = 0; i < num_modules; i++) {
 		name = modules[i];
 		if (!strcmp(name, "") || !strcmp(name, "empty"))
 			continue;

 		dev_dbg(&priv->pdev->dev, "MODULbus %d: name %s\n", i, name);
 		cmodio_setup_subdevice(priv, name, num_probed, i);
 		num_probed++;
 	}

 	/* print an error message if no modules were probed */
 	if (num_probed == 0) {
 		dev_err(&priv->pdev->dev, "no MODULbus modules specified, "
 					  "please set the ``modules'' kernel "
 					  "parameter according to your "
 					  "hardware configuration\n");
 		return -ENODEV;
 	}

 	return mfd_add_devices(&pdev->dev, 0, priv->cells,
 			       num_probed, NULL, pdev->irq, NULL);
 }

 /*
  * SYSFS Attributes
  */

 static ssize_t mbus_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	struct cmodio_device *priv = dev_get_drvdata(dev);

 	return snprintf(buf, PAGE_SIZE, "%x\n", priv->hex);
 }

 static DEVICE_ATTR(modulbus_number, S_IRUGO, mbus_show, NULL);

 static struct attribute *cmodio_sysfs_attrs[] = {
 	&dev_attr_modulbus_number.attr,
 	NULL,
 };

 static const struct attribute_group cmodio_sysfs_attr_group = {
 	.attrs = cmodio_sysfs_attrs,
 };

 /*
  * PCI Driver
  */

 static int cmodio_pci_probe(struct pci_dev *dev,
 				      const struct pci_device_id *id)
 {
 	struct cmodio_device *priv;
 	int ret;

 	priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv) {
 		dev_err(&dev->dev, "unable to allocate private data\n");
 		return -ENOMEM;
 	}

 	pci_set_drvdata(dev, priv);
 	priv->pdev = dev;

 	/* Hardware Initialization */
 	ret = pci_enable_device(dev);
 	if (ret) {
 		dev_err(&dev->dev, "unable to enable device\n");
 		return ret;
 	}

 	pci_set_master(dev);
 	ret = pci_request_regions(dev, DRV_NAME);
 	if (ret) {
 		dev_err(&dev->dev, "unable to request regions\n");
 		goto out_pci_disable_device;
 	}

 	/* Onboard configuration registers */
 	priv->ctrl = pci_ioremap_bar(dev, 4);
 	if (!priv->ctrl) {
 		dev_err(&dev->dev, "unable to remap onboard regs\n");
 		ret = -ENOMEM;
 		goto out_pci_release_regions;
 	}

 	/* Read the hex switch on the carrier board */
 	priv->hex = ioread8(&priv->ctrl->int_enable);

 	/* Add the MODULbus number (hex switch value) to the device's sysfs */
 	ret = sysfs_create_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);
 	if (ret) {
 		dev_err(&dev->dev, "unable to create sysfs attributes\n");
 		goto out_unmap_ctrl;
 	}

 	/*
 	 * Disable all interrupt lines, each submodule will enable its
 	 * own interrupt line if needed
 	 */
 	iowrite8(0xf, &priv->ctrl->int_disable);

 	/* Register drivers for all submodules */
 	ret = cmodio_probe_submodules(priv);
 	if (ret) {
 		dev_err(&dev->dev, "unable to probe submodules\n");
 		goto out_sysfs_remove_group;
 	}

 	return 0;

 out_sysfs_remove_group:
 	sysfs_remove_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);
 out_unmap_ctrl:
 	iounmap(priv->ctrl);
 out_pci_release_regions:
 	pci_release_regions(dev);
 out_pci_disable_device:
 	pci_disable_device(dev);

 	return ret;
 }

 static void cmodio_pci_remove(struct pci_dev *dev)
 {
 	struct cmodio_device *priv = pci_get_drvdata(dev);

 	mfd_remove_devices(&dev->dev);
 	sysfs_remove_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);
 	iounmap(priv->ctrl);
 	pci_release_regions(dev);
 	pci_disable_device(dev);
 }

 #define PCI_VENDOR_ID_JANZ		0x13c3

 /* The list of devices that this module will support */
 static const struct pci_device_id cmodio_pci_ids[] = {
 	{ PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030, PCI_VENDOR_ID_JANZ, 0x0101 },
 	{ PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050, PCI_VENDOR_ID_JANZ, 0x0100 },
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, cmodio_pci_ids);

 static struct pci_driver cmodio_pci_driver = {
 	.name     = DRV_NAME,
 	.id_table = cmodio_pci_ids,
 	.probe    = cmodio_pci_probe,
 	.remove   = cmodio_pci_remove,
 };

 module_pci_driver(cmodio_pci_driver);

 MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
 MODULE_DESCRIPTION("Janz CMOD-IO PCI MODULbus Carrier Board Driver");
 MODULE_LICENSE("GPL");
	/*
	* Janz CMOD-IO MODULbus Carrier Board PCI Driver
	*
	* Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
	*
	* Lots of inspiration and code was copied from drivers/mfd/sm501.c
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/pci.h>
	#include <linux/interrupt.h>
	#include <linux/delay.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/mfd/core.h>

	#include <linux/mfd/janz.h>

	#define DRV_NAME "janz-cmodio"

	/* Size of each MODULbus module in PCI BAR4 */
	#define CMODIO_MODULBUS_SIZE 0x200

	/* Maximum number of MODULbus modules on a CMOD-IO carrier board */
	#define CMODIO_MAX_MODULES 4

	/* Module Parameters */
	static unsigned int num_modules = CMODIO_MAX_MODULES;
	static char *modules[CMODIO_MAX_MODULES] = {
	"empty", "empty", "empty", "empty",
	};

	module_param_array(modules, charp, &num_modules, S_IRUGO);
	MODULE_PARM_DESC(modules, "MODULbus modules attached to the carrier board");

	/* Unique Device Id */
	static unsigned int cmodio_id;

	struct cmodio_device {
	/* Parent PCI device */
	struct pci_dev *pdev;

	/* PLX control registers */
	struct janz_cmodio_onboard_regs __iomem *ctrl;

	/* hex switch position */
	u8 hex;

	/* mfd-core API */
	struct mfd_cell cells[CMODIO_MAX_MODULES];
	struct resource resources[3 * CMODIO_MAX_MODULES];
	struct janz_platform_data pdata[CMODIO_MAX_MODULES];
	};

	/*
	* Subdevices using the mfd-core API
	*/

	static int cmodio_setup_subdevice(struct cmodio_device *priv,
	char *name, unsigned int devno,
	unsigned int modno)
	{
	struct janz_platform_data *pdata;
	struct mfd_cell *cell;
	struct resource *res;
	struct pci_dev *pci;

	pci = priv->pdev;
	cell = &priv->cells[devno];
	res = &priv->resources[devno * 3];
	pdata = &priv->pdata[devno];

	cell->name = name;
	cell->resources = res;
	cell->num_resources = 3;

	/* Setup the subdevice ID -- must be unique */
	cell->id = cmodio_id++;

	/* Add platform data */
	pdata->modno = modno;
	cell->platform_data = pdata;
	cell->pdata_size = sizeof(*pdata);

	/* MODULbus registers -- PCI BAR3 is big-endian MODULbus access */
	res->flags = IORESOURCE_MEM;
	res->parent = &pci->resource[3];
	res->start = pci->resource[3].start + (CMODIO_MODULBUS_SIZE * modno);
	res->end = res->start + CMODIO_MODULBUS_SIZE - 1;
	res++;

	/* PLX Control Registers -- PCI BAR4 is interrupt and other registers */
	res->flags = IORESOURCE_MEM;
	res->parent = &pci->resource[4];
	res->start = pci->resource[4].start;
	res->end = pci->resource[4].end;
	res++;

	/*
	* IRQ
	*
	* The start and end fields are used as an offset to the irq_base
	* parameter passed into the mfd_add_devices() function call. All
	* devices share the same IRQ.
	*/
	res->flags = IORESOURCE_IRQ;
	res->parent = NULL;
	res->start = 0;
	res->end = 0;
	res++;

	return 0;
	}

	/* Probe each submodule using kernel parameters */
	static int cmodio_probe_submodules(struct cmodio_device *priv)
	{
	struct pci_dev *pdev = priv->pdev;
	unsigned int num_probed = 0;
	char *name;
	int i;

	for (i = 0; i < num_modules; i++) {
	name = modules[i];
	if (!strcmp(name, "") \|\| !strcmp(name, "empty"))
	continue;

	dev_dbg(&priv->pdev->dev, "MODULbus %d: name %s\n", i, name);
	cmodio_setup_subdevice(priv, name, num_probed, i);
	num_probed++;
	}

	/* print an error message if no modules were probed */
	if (num_probed == 0) {
	dev_err(&priv->pdev->dev, "no MODULbus modules specified, "
	"please set the ``modules'' kernel "
	"parameter according to your "
	"hardware configuration\n");
	return -ENODEV;
	}

	return mfd_add_devices(&pdev->dev, 0, priv->cells,
	num_probed, NULL, pdev->irq, NULL);
	}

	/*
	* SYSFS Attributes
	*/

	static ssize_t mbus_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct cmodio_device *priv = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%x\n", priv->hex);
	}

	static DEVICE_ATTR(modulbus_number, S_IRUGO, mbus_show, NULL);

	static struct attribute *cmodio_sysfs_attrs[] = {
	&dev_attr_modulbus_number.attr,
	NULL,
	};

	static const struct attribute_group cmodio_sysfs_attr_group = {
	.attrs = cmodio_sysfs_attrs,
	};

	/*
	* PCI Driver
	*/

	static int cmodio_pci_probe(struct pci_dev *dev,
	const struct pci_device_id *id)
	{
	struct cmodio_device *priv;
	int ret;

	priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv) {
	dev_err(&dev->dev, "unable to allocate private data\n");
	return -ENOMEM;
	}

	pci_set_drvdata(dev, priv);
	priv->pdev = dev;

	/* Hardware Initialization */
	ret = pci_enable_device(dev);
	if (ret) {
	dev_err(&dev->dev, "unable to enable device\n");
	return ret;
	}

	pci_set_master(dev);
	ret = pci_request_regions(dev, DRV_NAME);
	if (ret) {
	dev_err(&dev->dev, "unable to request regions\n");
	goto out_pci_disable_device;
	}

	/* Onboard configuration registers */
	priv->ctrl = pci_ioremap_bar(dev, 4);
	if (!priv->ctrl) {
	dev_err(&dev->dev, "unable to remap onboard regs\n");
	ret = -ENOMEM;
	goto out_pci_release_regions;
	}

	/* Read the hex switch on the carrier board */
	priv->hex = ioread8(&priv->ctrl->int_enable);

	/* Add the MODULbus number (hex switch value) to the device's sysfs */
	ret = sysfs_create_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);
	if (ret) {
	dev_err(&dev->dev, "unable to create sysfs attributes\n");
	goto out_unmap_ctrl;
	}

	/*
	* Disable all interrupt lines, each submodule will enable its
	* own interrupt line if needed
	*/
	iowrite8(0xf, &priv->ctrl->int_disable);

	/* Register drivers for all submodules */
	ret = cmodio_probe_submodules(priv);
	if (ret) {
	dev_err(&dev->dev, "unable to probe submodules\n");
	goto out_sysfs_remove_group;
	}

	return 0;

	out_sysfs_remove_group:
	sysfs_remove_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);
	out_unmap_ctrl:
	iounmap(priv->ctrl);
	out_pci_release_regions:
	pci_release_regions(dev);
	out_pci_disable_device:
	pci_disable_device(dev);

	return ret;
	}

	static void cmodio_pci_remove(struct pci_dev *dev)
	{
	struct cmodio_device *priv = pci_get_drvdata(dev);

	mfd_remove_devices(&dev->dev);
	sysfs_remove_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);
	iounmap(priv->ctrl);
	pci_release_regions(dev);
	pci_disable_device(dev);
	}

	#define PCI_VENDOR_ID_JANZ 0x13c3

	/* The list of devices that this module will support */
	static const struct pci_device_id cmodio_pci_ids[] = {
	{ PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030, PCI_VENDOR_ID_JANZ, 0x0101 },
	{ PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050, PCI_VENDOR_ID_JANZ, 0x0100 },
	{ 0, }
	};
	MODULE_DEVICE_TABLE(pci, cmodio_pci_ids);

	static struct pci_driver cmodio_pci_driver = {
	.name = DRV_NAME,
	.id_table = cmodio_pci_ids,
	.probe = cmodio_pci_probe,
	.remove = cmodio_pci_remove,
	};

	module_pci_driver(cmodio_pci_driver);

	MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
	MODULE_DESCRIPTION("Janz CMOD-IO PCI MODULbus Carrier Board Driver");
	MODULE_LICENSE("GPL");