mcb: Add PCI carrier for MEN Chameleon Bus

Add support for MCB over PCI devices. Both PCI attached on-board Chameleon FPGAs
as well as CompactPCI based MCB carrier cards are supported with this driver.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mcb/Kconfig

@@ -13,3 +13,17 @@ menuconfig MCB
 	   for these devices.
 
 	   If build as a module, the module is called mcb.ko
+
+if MCB
+config MCB_PCI
+	   tristate "PCI based MCB carrier"
+	   default m
+	   help
+
+	   This is a MCB carrier on a PCI device. Both PCI attached on-board
+	   FPGAs as well as CompactPCI attached MCB FPGAs are supported with
+	   this driver.
+
+	   If build as a module, the module is called mcb-pci.ko
+
+endif # MCB

drivers/mcb/Makefile

@@ -3,3 +3,5 @@ obj-$(CONFIG_MCB) += mcb.o
 
 mcb-y += mcb-core.o
 mcb-y += mcb-parse.o
+
+obj-$(CONFIG_MCB_PCI) += mcb-pci.o

drivers/mcb/mcb-internal.h

@@ -3,6 +3,8 @@
 
 #include <linux/types.h>
 
+#define PCI_VENDOR_ID_MEN		0x1a88
+#define PCI_DEVICE_ID_MEN_CHAMELEON	0x4d45
 #define CHAMELEON_FILENAME_LEN		12
 #define CHAMELEONV2_MAGIC		0xabce
 

drivers/mcb/mcb-pci.c

+/*
+ * MEN Chameleon Bus.
+ *
+ * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
+ * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
+ *
+ * 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; version 2 of the License.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/mcb.h>
+
+#include "mcb-internal.h"
+
+struct priv {
+	struct mcb_bus *bus;
+	void __iomem *base;
+};
+
+static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct priv *priv;
+	phys_addr_t mapbase;
+	int ret;
+	int num_cells;
+	unsigned long flags;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable PCI device\n");
+		return -ENODEV;
+	}
+
+	mapbase = pci_resource_start(pdev, 0);
+	if (!mapbase) {
+		dev_err(&pdev->dev, "No PCI resource\n");
+		goto err_start;
+	}
+
+	ret = pci_request_region(pdev, 0, KBUILD_MODNAME);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to request PCI BARs\n");
+		goto err_start;
+	}
+
+	priv->base = pci_iomap(pdev, 0, 0);
+	if (!priv->base) {
+		dev_err(&pdev->dev, "Cannot ioremap\n");
+		ret = -ENOMEM;
+		goto err_ioremap;
+	}
+
+	flags = pci_resource_flags(pdev, 0);
+	if (flags & IORESOURCE_IO) {
+		ret = -ENOTSUPP;
+		dev_err(&pdev->dev,
+			"IO mapped PCI devices are not supported\n");
+		goto err_ioremap;
+	}
+
+	pci_set_drvdata(pdev, priv);
+
+	priv->bus = mcb_alloc_bus();
+
+	ret = chameleon_parse_cells(priv->bus, mapbase, priv->base);
+	if (ret < 0)
+		goto err_drvdata;
+	num_cells = ret;
+
+	dev_dbg(&pdev->dev, "Found %d cells\n", num_cells);
+
+	mcb_bus_add_devices(priv->bus);
+
+err_drvdata:
+	pci_iounmap(pdev, priv->base);
+err_ioremap:
+	pci_release_region(pdev, 0);
+err_start:
+	pci_disable_device(pdev);
+	return ret;
+}
+
+static void mcb_pci_remove(struct pci_dev *pdev)
+{
+	struct priv *priv = pci_get_drvdata(pdev);
+
+	mcb_release_bus(priv->bus);
+}
+
+static const struct pci_device_id mcb_pci_tbl[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
+	{ 0 },
+};
+MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
+
+static struct pci_driver mcb_pci_driver = {
+	.name = "mcb-pci",
+	.id_table = mcb_pci_tbl,
+	.probe = mcb_pci_probe,
+	.remove = mcb_pci_remove,
+};
+
+module_pci_driver(mcb_pci_driver);
+
+MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MCB over PCI support");