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Message-ID: <1393432147-31355-3-git-send-email-johannes.thumshirn@men.de>
Date: Wed, 26 Feb 2014 17:29:06 +0100
From: Johannes Thumshirn <johannes.thumshirn@....de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jonathan Cameron <jic23@...nel.org>
CC: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Johannes Thumshirn <johannes.thumshirn@....de>
Subject: [PATCH v3 2/3] 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@....de>
---
drivers/mcb/Kconfig | 14 ++++++
drivers/mcb/Makefile | 2 +
drivers/mcb/mcb-internal.h | 2 +
drivers/mcb/mcb-pci.c | 114 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 132 insertions(+)
create mode 100644 drivers/mcb/mcb-pci.c
diff --git a/drivers/mcb/Kconfig b/drivers/mcb/Kconfig
index 44c82d6..b8f5d46 100644
--- a/drivers/mcb/Kconfig
+++ b/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
diff --git a/drivers/mcb/Makefile b/drivers/mcb/Makefile
index 2d9a751..1ae1413 100644
--- a/drivers/mcb/Makefile
+++ b/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
diff --git a/drivers/mcb/mcb-internal.h b/drivers/mcb/mcb-internal.h
index db22777..f956ef2 100644
--- a/drivers/mcb/mcb-internal.h
+++ b/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
diff --git a/drivers/mcb/mcb-pci.c b/drivers/mcb/mcb-pci.c
new file mode 100644
index 0000000..99c742c
--- /dev/null
+++ b/drivers/mcb/mcb-pci.c
@@ -0,0 +1,114 @@
+/*
+ * MEN Chameleon Bus.
+ *
+ * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
+ * Author: Johannes Thumshirn <johannes.thumshirn@....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@....de>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MCB over PCI support");
--
1.8.5.4
--
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