mfd: Janz CMOD-IO PCI MODULbus Carrier Board support
The Janz CMOD-IO PCI MODULbus carrier board is a PCI to MODULbus bridge, which may host many different types of MODULbus daughterboards, including CAN and GPIO controllers. Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Reviewed-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Ira W. Snyder
Samuel Ortiz
parent
165bce9783
commit
bd3581323c
4 changed files with 369 additions and 0 deletions
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@ -418,6 +418,16 @@ config MFD_RDC321X
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southbridge which provides access to GPIOs and Watchdog using the
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southbridge PCI device configuration space.
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config MFD_JANZ_CMODIO
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tristate "Support for Janz CMOD-IO PCI MODULbus Carrier Board"
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select MFD_CORE
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depends on PCI
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help
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This is the core driver for the Janz CMOD-IO PCI MODULbus
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carrier board. This device is a PCI to MODULbus bridge which may
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host many different types of MODULbus daughterboards, including
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CAN and GPIO controllers.
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endmenu
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menu "Multimedia Capabilities Port drivers"
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@ -65,3 +65,4 @@ obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
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obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
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obj-$(CONFIG_LPC_SCH) += lpc_sch.o
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obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o
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obj-$(CONFIG_MFD_JANZ_CMODIO) += janz-cmodio.o
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304
drivers/mfd/janz-cmodio.c
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304
drivers/mfd/janz-cmodio.c
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@ -0,0 +1,304 @@
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/*
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* Janz CMOD-IO MODULbus Carrier Board PCI Driver
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*
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* Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
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*
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* Lots of inspiration and code was copied from drivers/mfd/sm501.c
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/janz.h>
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#define DRV_NAME "janz-cmodio"
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/* Size of each MODULbus module in PCI BAR4 */
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#define CMODIO_MODULBUS_SIZE 0x200
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/* Maximum number of MODULbus modules on a CMOD-IO carrier board */
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#define CMODIO_MAX_MODULES 4
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/* Module Parameters */
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static unsigned int num_modules = CMODIO_MAX_MODULES;
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static unsigned char *modules[CMODIO_MAX_MODULES] = {
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"empty", "empty", "empty", "empty",
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};
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module_param_array(modules, charp, &num_modules, S_IRUGO);
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MODULE_PARM_DESC(modules, "MODULbus modules attached to the carrier board");
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/* Unique Device Id */
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static unsigned int cmodio_id;
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struct cmodio_device {
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/* Parent PCI device */
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struct pci_dev *pdev;
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/* PLX control registers */
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struct janz_cmodio_onboard_regs __iomem *ctrl;
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/* hex switch position */
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u8 hex;
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/* mfd-core API */
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struct mfd_cell cells[CMODIO_MAX_MODULES];
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struct resource resources[3 * CMODIO_MAX_MODULES];
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struct janz_platform_data pdata[CMODIO_MAX_MODULES];
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};
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/*
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* Subdevices using the mfd-core API
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*/
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static int __devinit cmodio_setup_subdevice(struct cmodio_device *priv,
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char *name, unsigned int devno,
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unsigned int modno)
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{
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struct janz_platform_data *pdata;
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struct mfd_cell *cell;
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struct resource *res;
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struct pci_dev *pci;
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pci = priv->pdev;
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cell = &priv->cells[devno];
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res = &priv->resources[devno * 3];
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pdata = &priv->pdata[devno];
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cell->name = name;
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cell->resources = res;
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cell->num_resources = 3;
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/* Setup the subdevice ID -- must be unique */
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cell->id = cmodio_id++;
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/* Add platform data */
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pdata->modno = modno;
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cell->platform_data = pdata;
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cell->data_size = sizeof(*pdata);
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/* MODULbus registers -- PCI BAR3 is big-endian MODULbus access */
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res->flags = IORESOURCE_MEM;
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res->parent = &pci->resource[3];
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res->start = pci->resource[3].start + (CMODIO_MODULBUS_SIZE * modno);
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res->end = res->start + CMODIO_MODULBUS_SIZE - 1;
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res++;
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/* PLX Control Registers -- PCI BAR4 is interrupt and other registers */
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res->flags = IORESOURCE_MEM;
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res->parent = &pci->resource[4];
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res->start = pci->resource[4].start;
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res->end = pci->resource[4].end;
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res++;
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/*
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* IRQ
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*
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* The start and end fields are used as an offset to the irq_base
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* parameter passed into the mfd_add_devices() function call. All
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* devices share the same IRQ.
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*/
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res->flags = IORESOURCE_IRQ;
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res->parent = NULL;
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res->start = 0;
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res->end = 0;
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res++;
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return 0;
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}
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/* Probe each submodule using kernel parameters */
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static int __devinit cmodio_probe_submodules(struct cmodio_device *priv)
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{
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struct pci_dev *pdev = priv->pdev;
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unsigned int num_probed = 0;
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char *name;
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int i;
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for (i = 0; i < num_modules; i++) {
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name = modules[i];
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if (!strcmp(name, "") || !strcmp(name, "empty"))
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continue;
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dev_dbg(&priv->pdev->dev, "MODULbus %d: name %s\n", i, name);
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cmodio_setup_subdevice(priv, name, num_probed, i);
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num_probed++;
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}
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/* print an error message if no modules were probed */
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if (num_probed == 0) {
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dev_err(&priv->pdev->dev, "no MODULbus modules specified, "
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"please set the ``modules'' kernel "
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"parameter according to your "
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"hardware configuration\n");
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return -ENODEV;
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}
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return mfd_add_devices(&pdev->dev, 0, priv->cells,
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num_probed, NULL, pdev->irq);
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}
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/*
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* SYSFS Attributes
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*/
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static ssize_t mbus_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct cmodio_device *priv = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%x\n", priv->hex);
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}
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static DEVICE_ATTR(modulbus_number, S_IRUGO, mbus_show, NULL);
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static struct attribute *cmodio_sysfs_attrs[] = {
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&dev_attr_modulbus_number.attr,
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NULL,
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};
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static const struct attribute_group cmodio_sysfs_attr_group = {
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.attrs = cmodio_sysfs_attrs,
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};
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/*
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* PCI Driver
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*/
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static int __devinit cmodio_pci_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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struct cmodio_device *priv;
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int ret;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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dev_err(&dev->dev, "unable to allocate private data\n");
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ret = -ENOMEM;
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goto out_return;
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}
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pci_set_drvdata(dev, priv);
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priv->pdev = dev;
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/* Hardware Initialization */
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ret = pci_enable_device(dev);
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if (ret) {
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dev_err(&dev->dev, "unable to enable device\n");
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goto out_free_priv;
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}
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pci_set_master(dev);
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ret = pci_request_regions(dev, DRV_NAME);
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if (ret) {
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dev_err(&dev->dev, "unable to request regions\n");
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goto out_pci_disable_device;
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}
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/* Onboard configuration registers */
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priv->ctrl = pci_ioremap_bar(dev, 4);
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if (!priv->ctrl) {
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dev_err(&dev->dev, "unable to remap onboard regs\n");
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ret = -ENOMEM;
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goto out_pci_release_regions;
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}
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/* Read the hex switch on the carrier board */
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priv->hex = ioread8(&priv->ctrl->int_enable);
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/* Add the MODULbus number (hex switch value) to the device's sysfs */
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ret = sysfs_create_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);
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if (ret) {
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dev_err(&dev->dev, "unable to create sysfs attributes\n");
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goto out_unmap_ctrl;
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}
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/*
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* Disable all interrupt lines, each submodule will enable its
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* own interrupt line if needed
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*/
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iowrite8(0xf, &priv->ctrl->int_disable);
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/* Register drivers for all submodules */
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ret = cmodio_probe_submodules(priv);
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if (ret) {
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dev_err(&dev->dev, "unable to probe submodules\n");
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goto out_sysfs_remove_group;
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}
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return 0;
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out_sysfs_remove_group:
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sysfs_remove_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);
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out_unmap_ctrl:
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iounmap(priv->ctrl);
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out_pci_release_regions:
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pci_release_regions(dev);
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out_pci_disable_device:
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pci_disable_device(dev);
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out_free_priv:
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kfree(priv);
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out_return:
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return ret;
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}
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static void __devexit cmodio_pci_remove(struct pci_dev *dev)
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{
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struct cmodio_device *priv = pci_get_drvdata(dev);
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mfd_remove_devices(&dev->dev);
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sysfs_remove_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);
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iounmap(priv->ctrl);
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pci_release_regions(dev);
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pci_disable_device(dev);
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kfree(priv);
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}
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#define PCI_VENDOR_ID_JANZ 0x13c3
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/* The list of devices that this module will support */
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static DEFINE_PCI_DEVICE_TABLE(cmodio_pci_ids) = {
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{ PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030, PCI_VENDOR_ID_JANZ, 0x0101 },
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{ PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050, PCI_VENDOR_ID_JANZ, 0x0100 },
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, cmodio_pci_ids);
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static struct pci_driver cmodio_pci_driver = {
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.name = DRV_NAME,
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.id_table = cmodio_pci_ids,
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.probe = cmodio_pci_probe,
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.remove = __devexit_p(cmodio_pci_remove),
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};
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/*
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* Module Init / Exit
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*/
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static int __init cmodio_init(void)
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{
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return pci_register_driver(&cmodio_pci_driver);
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}
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static void __exit cmodio_exit(void)
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{
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pci_unregister_driver(&cmodio_pci_driver);
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}
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MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
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MODULE_DESCRIPTION("Janz CMOD-IO PCI MODULbus Carrier Board Driver");
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MODULE_LICENSE("GPL");
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module_init(cmodio_init);
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module_exit(cmodio_exit);
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54
include/linux/mfd/janz.h
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54
include/linux/mfd/janz.h
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@ -0,0 +1,54 @@
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/*
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* Common Definitions for Janz MODULbus devices
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*
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* Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef JANZ_H
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#define JANZ_H
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struct janz_platform_data {
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/* MODULbus Module Number */
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unsigned int modno;
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};
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/* PLX bridge chip onboard registers */
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struct janz_cmodio_onboard_regs {
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u8 unused1;
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/*
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* Read access: interrupt status
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* Write access: interrupt disable
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*/
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u8 int_disable;
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u8 unused2;
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/*
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* Read access: MODULbus number (hex switch)
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* Write access: interrupt enable
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*/
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u8 int_enable;
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u8 unused3;
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/* write-only */
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u8 reset_assert;
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u8 unused4;
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/* write-only */
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u8 reset_deassert;
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u8 unused5;
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/* read-write access to serial EEPROM */
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u8 eep;
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u8 unused6;
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/* write-only access to EEPROM chip select */
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u8 enid;
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};
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#endif /* JANZ_H */
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