mcb: Added support for LPC or non PCI based MCB carrier

Add support for MCB bases FPGAs connected to the LPC or
non PCI Bus.

This driver currently supports the SC24 board. The FPGA
is connected to the LPC bus and is identified using the BIOS
DMI string.

Signed-off-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mcb/Kconfig b/drivers/mcb/Kconfig
index e9a6976e101071b99fd8149d2cf9741911d8a6cc..76d9c51de6c99d3cdef92cbe40e07077cb690994 100644 (file)
--- a/drivers/mcb/Kconfig
+++ b/drivers/mcb/Kconfig
@@ -28,4 +28,13 @@ config MCB_PCI
 
           If build as a module, the module is called mcb-pci.ko
 
+config MCB_LPC
+          tristate "LPC (non PCI) based MCB carrier"
+          default n
+          help
+
+          This is a MCB carrier on a LPC or non PCI device.
+
+          If build as a module, the module is called mcb-lpc.ko
+
 endif # MCB

diff --git a/drivers/mcb/Makefile b/drivers/mcb/Makefile
index 1ae141311defb9888e24ca404a733147ead9956e..bcc7745774abfee8ffa2e552c5f0175cd25be01b 100644 (file)
--- a/drivers/mcb/Makefile
+++ b/drivers/mcb/Makefile
@@ -5,3 +5,4 @@ mcb-y += mcb-core.o
 mcb-y += mcb-parse.o
 
 obj-$(CONFIG_MCB_PCI) += mcb-pci.o
+obj-$(CONFIG_MCB_LPC) += mcb-lpc.o

diff --git a/drivers/mcb/mcb-lpc.c b/drivers/mcb/mcb-lpc.c
new file mode 100644 (file)
index 0000000..d072c08
--- /dev/null
+++ b/drivers/mcb/mcb-lpc.c
@@ -0,0 +1,158 @@
+/*
+ * MEN Chameleon Bus.
+ *
+ * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
+ * Author: Andreas Werner <andreas.werner@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/platform_device.h>
+#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/mcb.h>
+#include <linux/io.h>
+#include "mcb-internal.h"
+
+struct priv {
+       struct mcb_bus *bus;
+       struct resource *mem;
+       void __iomem *base;
+};
+
+static int mcb_lpc_probe(struct platform_device *pdev)
+{
+       struct resource *res;
+       struct priv *priv;
+       int ret = 0;
+
+       priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       priv->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!priv->mem) {
+               dev_err(&pdev->dev, "No Memory resource\n");
+               return -ENODEV;
+       }
+
+       res = devm_request_mem_region(&pdev->dev, priv->mem->start,
+                                     resource_size(priv->mem),
+                                     KBUILD_MODNAME);
+       if (!res) {
+               dev_err(&pdev->dev, "Failed to request IO memory\n");
+               return -EBUSY;
+       }
+
+       priv->base = devm_ioremap(&pdev->dev, priv->mem->start,
+                                 resource_size(priv->mem));
+       if (!priv->base) {
+               dev_err(&pdev->dev, "Cannot ioremap\n");
+               return -ENOMEM;
+       }
+
+       platform_set_drvdata(pdev, priv);
+
+       priv->bus = mcb_alloc_bus(&pdev->dev);
+       if (IS_ERR(priv->bus))
+               return PTR_ERR(priv->bus);
+
+       ret = chameleon_parse_cells(priv->bus, priv->mem->start, priv->base);
+       if (ret < 0) {
+               mcb_release_bus(priv->bus);
+               return ret;
+       }
+
+       dev_dbg(&pdev->dev, "Found %d cells\n", ret);
+
+       mcb_bus_add_devices(priv->bus);
+
+       return 0;
+
+}
+
+static int mcb_lpc_remove(struct platform_device *pdev)
+{
+       struct priv *priv = platform_get_drvdata(pdev);
+
+       mcb_release_bus(priv->bus);
+
+       return 0;
+}
+
+static struct platform_device *mcb_lpc_pdev;
+
+static int mcb_lpc_create_platform_device(const struct dmi_system_id *id)
+{
+       struct resource *res = id->driver_data;
+       int ret;
+
+       mcb_lpc_pdev = platform_device_alloc("mcb-lpc", -1);
+       if (!mcb_lpc_pdev)
+               return -ENOMEM;
+
+       ret = platform_device_add_resources(mcb_lpc_pdev, res, 1);
+       if (ret)
+               goto out_put;
+
+       ret = platform_device_add(mcb_lpc_pdev);
+       if (ret)
+               goto out_put;
+
+       return 0;
+
+out_put:
+       platform_device_put(mcb_lpc_pdev);
+       return ret;
+}
+
+static struct resource sc24_fpga_resource = {
+       .start = 0xe000e000,
+       .end = 0xe000e000 + CHAM_HEADER_SIZE,
+       .flags = IORESOURCE_MEM,
+};
+
+static struct platform_driver mcb_lpc_driver = {
+       .driver         = {
+               .name = "mcb-lpc",
+       },
+       .probe          = mcb_lpc_probe,
+       .remove         = mcb_lpc_remove,
+};
+
+static const struct dmi_system_id mcb_lpc_dmi_table[] = {
+       {
+               .ident = "SC24",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "MEN"),
+                       DMI_MATCH(DMI_PRODUCT_VERSION, "14SC24"),
+               },
+               .driver_data = (void *)&sc24_fpga_resource,
+               .callback = mcb_lpc_create_platform_device,
+       },
+       {}
+};
+MODULE_DEVICE_TABLE(dmi, mcb_lpc_dmi_table);
+
+static int __init mcb_lpc_init(void)
+{
+       if (!dmi_check_system(mcb_lpc_dmi_table))
+               return -ENODEV;
+
+       return platform_driver_register(&mcb_lpc_driver);
+}
+
+static void __exit mcb_lpc_exit(void)
+{
+       platform_device_unregister(mcb_lpc_pdev);
+       platform_driver_unregister(&mcb_lpc_driver);
+}
+
+module_init(mcb_lpc_init);
+module_exit(mcb_lpc_exit);
+
+MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MCB over LPC support");