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>

5 files changed, 213 insertions, 121 deletions

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 2a4ba1993083..f34a2d16d18f 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -244,14 +244,21 @@ config SPI_TXX9
 
 config SPI_XILINX
         tristate "Xilinx SPI controller"
-        depends on (XILINX_VIRTEX || MICROBLAZE) && EXPERIMENTAL
+        depends on EXPERIMENTAL
         select SPI_BITBANG
+        select SPI_XILINX_OF if (XILINX_VIRTEX || MICROBLAZE)
         help
           This exposes the SPI controller IP from the Xilinx EDK.
 
           See the "OPB Serial Peripheral Interface (SPI) (v1.00e)"
           Product Specification document (DS464) for hardware details.
 
+config SPI_XILINX_OF
+        tristate "Xilinx SPI controller OF device"
+        depends on SPI_XILINX && (XILINX_VIRTEX || MICROBLAZE)
+        help
+          This is the OF driver for the SPI controller IP from the Xilinx EDK.
+
 #
 # Add new SPI master controllers in alphabetical order above this line
 #
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index e3f092a9afa5..01c409548044 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_SPI_S3C24XX_GPIO)		+= spi_s3c24xx_gpio.o
 obj-$(CONFIG_SPI_S3C24XX)               += spi_s3c24xx.o
 obj-$(CONFIG_SPI_TXX9)                  += spi_txx9.o
 obj-$(CONFIG_SPI_XILINX)                += xilinx_spi.o
+obj-$(CONFIG_SPI_XILINX_OF)             += xilinx_spi_of.o
 obj-$(CONFIG_SPI_SH_SCI)                += spi_sh_sci.o
 obj-$(CONFIG_SPI_STMP3XXX)              += spi_stmp.o
 #       ... add above this line ...
diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c
index 5a143b9f6361..69fa26d82ce4 100644
--- a/drivers/spi/xilinx_spi.c
+++ b/drivers/spi/xilinx_spi.c
@@ -14,16 +14,14 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
-#include <linux/platform_device.h>
-
-#include <linux/of_platform.h>
-#include <linux/of_device.h>
-#include <linux/of_spi.h>
 
 #include <linux/spi/spi.h>
 #include <linux/spi/spi_bitbang.h>
 #include <linux/io.h>
 
+#include "xilinx_spi.h"
+#include <linux/spi/xilinx_spi.h>
+
 #define XILINX_SPI_NAME "xilinx_spi"
 
 /* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e)
@@ -78,7 +76,7 @@ struct xilinx_spi {
         /* bitbang has to be first */
         struct spi_bitbang bitbang;
         struct completion done;
-
+        struct resource mem; /* phys mem */
         void __iomem    *regs;  /* virt. address of the control registers */
 
         u32             irq;
@@ -284,40 +282,22 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
-static int __init xilinx_spi_of_probe(struct of_device *ofdev,
-                                        const struct of_device_id *match)
+struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem,
+        u32 irq, s16 bus_num)
 {
         struct spi_master *master;
         struct xilinx_spi *xspi;
-        struct resource r_irq_struct;
-        struct resource r_mem_struct;
-
-        struct resource *r_irq = &r_irq_struct;
-        struct resource *r_mem = &r_mem_struct;
-        int rc = 0;
-        const u32 *prop;
-        int len;
-
-        /* Get resources(memory, IRQ) associated with the device */
-        master = spi_alloc_master(&ofdev->dev, sizeof(struct xilinx_spi));
+        struct xspi_platform_data *pdata = dev->platform_data;
+        int ret;
 
-        if (master == NULL) {
-                return -ENOMEM;
-        }
-
-        dev_set_drvdata(&ofdev->dev, master);
-
-        rc = of_address_to_resource(ofdev->node, 0, r_mem);
-        if (rc) {
-                dev_warn(&ofdev->dev, "invalid address\n");
-                goto put_master;
+        if (!pdata) {
+                dev_err(dev, "No platform data attached\n");
+                return NULL;
         }
 
-        rc = of_irq_to_resource(ofdev->node, 0, r_irq);
-        if (rc == NO_IRQ) {
-                dev_warn(&ofdev->dev, "no IRQ found\n");
-                goto put_master;
-        }
+        master = spi_alloc_master(dev, sizeof(struct xilinx_spi));
+        if (!master)
+                return NULL;
 
         /* the spi->mode bits understood by this driver: */
         master->mode_bits = SPI_CPOL | SPI_CPHA;
@@ -330,128 +310,67 @@ static int __init xilinx_spi_of_probe(struct of_device *ofdev,
         xspi->bitbang.master->setup = xilinx_spi_setup;
         init_completion(&xspi->done);
 
-        xspi->irq = r_irq->start;
-
-        if (!request_mem_region(r_mem->start,
-                        r_mem->end - r_mem->start + 1, XILINX_SPI_NAME)) {
-                rc = -ENXIO;
-                dev_warn(&ofdev->dev, "memory request failure\n");
+        if (!request_mem_region(mem->start, resource_size(mem),
+                XILINX_SPI_NAME))
                 goto put_master;
-        }
 
-        xspi->regs = ioremap(r_mem->start, r_mem->end - r_mem->start + 1);
+        xspi->regs = ioremap(mem->start, resource_size(mem));
         if (xspi->regs == NULL) {
-                rc = -ENOMEM;
-                dev_warn(&ofdev->dev, "ioremap failure\n");
-                goto release_mem;
+                dev_warn(dev, "ioremap failure\n");
+                goto map_failed;
         }
-        xspi->irq = r_irq->start;
 
-        /* dynamic bus assignment */
-        master->bus_num = -1;
+        master->bus_num = bus_num;
+        master->num_chipselect = pdata->num_chipselect;
 
-        /* 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");
-                goto unmap_io;
-        }
-        master->num_chipselect = *prop;
+        xspi->mem = *mem;
+        xspi->irq = irq;
 
         /* SPI controller initializations */
         xspi_init_hw(xspi->regs);
 
         /* Register for SPI Interrupt */
-        rc = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi);
-        if (rc != 0) {
-                dev_warn(&ofdev->dev, "irq request failure: %d\n", xspi->irq);
+        ret = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi);
+        if (ret)
                 goto unmap_io;
-        }
 
-        rc = spi_bitbang_start(&xspi->bitbang);
-        if (rc != 0) {
-                dev_err(&ofdev->dev, "spi_bitbang_start FAILED\n");
+        ret = spi_bitbang_start(&xspi->bitbang);
+        if (ret) {
+                dev_err(dev, "spi_bitbang_start FAILED\n");
                 goto free_irq;
         }
 
-        dev_info(&ofdev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n",
-                        (unsigned int)r_mem->start, (u32)xspi->regs, xspi->irq);
-
-        /* Add any subnodes on the SPI bus */
-        of_register_spi_devices(master, ofdev->node);
-
-        return rc;
+        dev_info(dev, "at 0x%08X mapped to 0x%08X, irq=%d\n",
+                (u32)mem->start, (u32)xspi->regs, xspi->irq);
+        return master;
 
 free_irq:
         free_irq(xspi->irq, xspi);
 unmap_io:
         iounmap(xspi->regs);
-release_mem:
-        release_mem_region(r_mem->start, resource_size(r_mem));
+map_failed:
+        release_mem_region(mem->start, resource_size(mem));
 put_master:
         spi_master_put(master);
-        return rc;
+        return NULL;
 }
+EXPORT_SYMBOL(xilinx_spi_init);
 
-static int __devexit xilinx_spi_remove(struct of_device *ofdev)
+void xilinx_spi_deinit(struct spi_master *master)
 {
         struct xilinx_spi *xspi;
-        struct spi_master *master;
-        struct resource r_mem;
 
-        master = platform_get_drvdata(ofdev);
         xspi = spi_master_get_devdata(master);
 
         spi_bitbang_stop(&xspi->bitbang);
         free_irq(xspi->irq, xspi);
         iounmap(xspi->regs);
-        if (!of_address_to_resource(ofdev->node, 0, &r_mem))
-                release_mem_region(r_mem.start, resource_size(&r_mem));
-        dev_set_drvdata(&ofdev->dev, 0);
-        spi_master_put(xspi->bitbang.master);
-
-        return 0;
-}
-
-/* work with hotplug and coldplug */
-MODULE_ALIAS("platform:" XILINX_SPI_NAME);
-
-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 = {
-        .owner = THIS_MODULE,
-        .name = "xilinx-xps-spi",
-        .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_init(void)
-{
-        return of_register_platform_driver(&xilinx_spi_of_driver);
+        release_mem_region(xspi->mem.start, resource_size(&xspi->mem));
+        spi_master_put(xspi->bitbang.master);
 }
-module_init(xilinx_spi_init);
+EXPORT_SYMBOL(xilinx_spi_deinit);
 
-static void __exit xilinx_spi_exit(void)
-{
-        of_unregister_platform_driver(&xilinx_spi_of_driver);
-}
-module_exit(xilinx_spi_exit);
 MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
 MODULE_DESCRIPTION("Xilinx SPI driver");
 MODULE_LICENSE("GPL");
diff --git a/drivers/spi/xilinx_spi.h b/drivers/spi/xilinx_spi.h
new file mode 100644
index 000000000000..d211accf68d2
--- /dev/null
+++ b/drivers/spi/xilinx_spi.h
@@ -0,0 +1,32 @@
+/*
+ * Xilinx SPI device driver API and platform data header file
+ *
+ * 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.
+ */
+
+#ifndef _XILINX_SPI_H_
+#define _XILINX_SPI_H_
+
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
+
+#define XILINX_SPI_NAME "xilinx_spi"
+
+struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem,
+        u32 irq, s16 bus_num);
+
+void xilinx_spi_deinit(struct spi_master *master);
+#endif
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");