xilinx_spi: Split into of driver and generic part.

This patch splits the xilinx_spi driver into a generic part and a
OF driver part.

The reason for this is to later add in a platform driver as well.

Tested-by: John Linn <John.Linn@xilinx.com>
Signed-off-by: Richard Röjfors <richard.rojfors@mocean-labs.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 133 insertions, 0 deletions

diff --git a/drivers/spi/xilinx_spi_of.c b/drivers/spi/xilinx_spi_of.c
new file mode 100644
index 000000000000..151aa13494bd
--- /dev/null
+++ b/drivers/spi/xilinx_spi_of.c
@@ -0,0 +1,133 @@
+/*
+ * Xilinx SPI OF device driver
+ *
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * Xilinx SPI devices as OF devices
+ *
+ * Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#include <linux/of_platform.h>
+#include <linux/of_device.h>
+#include <linux/of_spi.h>
+
+#include <linux/spi/xilinx_spi.h>
+#include "xilinx_spi.h"
+
+
+static int __devinit xilinx_spi_of_probe(struct of_device *ofdev,
+        const struct of_device_id *match)
+{
+        struct spi_master *master;
+        struct xspi_platform_data *pdata;
+        struct resource r_mem;
+        struct resource r_irq;
+        int rc = 0;
+        const u32 *prop;
+        int len;
+
+        rc = of_address_to_resource(ofdev->node, 0, &r_mem);
+        if (rc) {
+                dev_warn(&ofdev->dev, "invalid address\n");
+                return rc;
+        }
+
+        rc = of_irq_to_resource(ofdev->node, 0, &r_irq);
+        if (rc == NO_IRQ) {
+                dev_warn(&ofdev->dev, "no IRQ found\n");
+                return -ENODEV;
+        }
+
+        ofdev->dev.platform_data =
+                kzalloc(sizeof(struct xspi_platform_data), GFP_KERNEL);
+        pdata = ofdev->dev.platform_data;
+        if (!pdata)
+                return -ENOMEM;
+
+        /* number of slave select bits is required */
+        prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len);
+        if (!prop || len < sizeof(*prop)) {
+                dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
+                return -EINVAL;
+        }
+        pdata->num_chipselect = *prop;
+        master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1);
+        if (!master)
+                return -ENODEV;
+
+        dev_set_drvdata(&ofdev->dev, master);
+
+        /* Add any subnodes on the SPI bus */
+        of_register_spi_devices(master, ofdev->node);
+
+        return 0;
+}
+
+static int __devexit xilinx_spi_remove(struct of_device *ofdev)
+{
+        xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev));
+        dev_set_drvdata(&ofdev->dev, 0);
+        kfree(ofdev->dev.platform_data);
+        ofdev->dev.platform_data = NULL;
+        return 0;
+}
+
+static int __exit xilinx_spi_of_remove(struct of_device *op)
+{
+        return xilinx_spi_remove(op);
+}
+
+static struct of_device_id xilinx_spi_of_match[] = {
+        { .compatible = "xlnx,xps-spi-2.00.a", },
+        { .compatible = "xlnx,xps-spi-2.00.b", },
+        {}
+};
+
+MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
+
+static struct of_platform_driver xilinx_spi_of_driver = {
+        .match_table = xilinx_spi_of_match,
+        .probe = xilinx_spi_of_probe,
+        .remove = __exit_p(xilinx_spi_of_remove),
+        .driver = {
+                .name = "xilinx-xps-spi",
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init xilinx_spi_of_init(void)
+{
+        return of_register_platform_driver(&xilinx_spi_of_driver);
+}
+module_init(xilinx_spi_of_init);
+
+static void __exit xilinx_spi_of_exit(void)
+{
+        of_unregister_platform_driver(&xilinx_spi_of_driver);
+}
+module_exit(xilinx_spi_of_exit);
+
+MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
+MODULE_DESCRIPTION("Xilinx SPI platform driver");
+MODULE_LICENSE("GPL v2");