1 files changed, 396 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
new file mode 100644
index 000000000000..e47d40ac6f39
--- /dev/null
+++ b/arch/powerpc/kernel/ibmebus.c
@@ -0,0 +1,396 @@
+/*
+ * IBM PowerPC IBM eBus Infrastructure Support.
+ *
+ * Copyright (c) 2005 IBM Corporation
+ *  Heiko J Schick <schickhj@de.ibm.com>
+ *    
+ * All rights reserved.
+ *
+ * This source code is distributed under a dual license of GPL v2.0 and OpenIB 
+ * BSD. 
+ *
+ * OpenIB BSD License
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met: 
+ *
+ * Redistributions of source code must retain the above copyright notice, this 
+ * list of conditions and the following disclaimer. 
+ *
+ * Redistributions in binary form must reproduce the above copyright notice, 
+ * this list of conditions and the following disclaimer in the documentation 
+ * and/or other materials
+ * provided with the distribution. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+ * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/kobject.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <asm/ibmebus.h>
+#include <asm/abs_addr.h>
+
+static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */
+        .name = ibmebus_bus_device.ofdev.dev.bus_id,
+        .ofdev.dev.bus_id = "ibmebus",
+        .ofdev.dev.bus    = &ibmebus_bus_type,
+};
+
+static void *ibmebus_alloc_coherent(struct device *dev,
+                                    size_t size,
+                                    dma_addr_t *dma_handle,
+                                    gfp_t flag)
+{
+        void *mem;
+        
+        mem = kmalloc(size, flag);
+        *dma_handle = (dma_addr_t)mem;
+
+        return mem;
+}
+
+static void ibmebus_free_coherent(struct device *dev,
+                                  size_t size, void *vaddr, 
+                                  dma_addr_t dma_handle)
+{
+        kfree(vaddr);
+}
+
+static dma_addr_t ibmebus_map_single(struct device *dev,
+                                     void *ptr,
+                                     size_t size,
+                                     enum dma_data_direction direction)
+{
+        return (dma_addr_t)(ptr);
+}
+
+static void ibmebus_unmap_single(struct device *dev,
+                                 dma_addr_t dma_addr,
+                                 size_t size, 
+                                 enum dma_data_direction direction)
+{
+        return;
+}
+
+static int ibmebus_map_sg(struct device *dev,
+                          struct scatterlist *sg,
+                          int nents, enum dma_data_direction direction)
+{
+        int i;
+        
+        for (i = 0; i < nents; i++) {
+                sg[i].dma_address = (dma_addr_t)page_address(sg[i].page) 
+                        + sg[i].offset;
+                sg[i].dma_length = sg[i].length;
+        }
+        
+        return nents;
+}
+
+static void ibmebus_unmap_sg(struct device *dev,
+                             struct scatterlist *sg,
+                             int nents, enum dma_data_direction direction)
+{
+        return;
+}
+
+static int ibmebus_dma_supported(struct device *dev, u64 mask)
+{
+        return 1;
+}
+
+struct dma_mapping_ops ibmebus_dma_ops = {
+        .alloc_coherent = ibmebus_alloc_coherent,
+        .free_coherent  = ibmebus_free_coherent,
+        .map_single     = ibmebus_map_single,
+        .unmap_single   = ibmebus_unmap_single,
+        .map_sg         = ibmebus_map_sg,
+        .unmap_sg       = ibmebus_unmap_sg,
+        .dma_supported  = ibmebus_dma_supported,
+};
+
+static int ibmebus_bus_probe(struct device *dev)
+{
+        struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
+        struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
+        const struct of_device_id *id;
+        int error = -ENODEV;
+        
+        if (!ibmebusdrv->probe)
+                return error;
+        
+        id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
+        if (id) {
+                error = ibmebusdrv->probe(ibmebusdev, id);
+        }
+        
+        return error;
+}
+
+static int ibmebus_bus_remove(struct device *dev)
+{
+        struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
+        struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
+        
+        if (ibmebusdrv->remove) {
+                return ibmebusdrv->remove(ibmebusdev);
+        }
+        
+        return 0;
+}
+
+static void __devinit ibmebus_dev_release(struct device *dev)
+{
+        of_node_put(to_ibmebus_dev(dev)->ofdev.node);
+        kfree(to_ibmebus_dev(dev));
+}
+
+static ssize_t ibmebusdev_show_name(struct device *dev, 
+                                    struct device_attribute *attr, char *buf)
+{
+        return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name);
+}
+static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name, 
+                   NULL);
+
+static struct ibmebus_dev* __devinit ibmebus_register_device_common(
+        struct ibmebus_dev *dev, char *name)
+{
+        int err = 0;
+
+        dev->name = name;
+        dev->ofdev.dev.parent  = &ibmebus_bus_device.ofdev.dev;
+        dev->ofdev.dev.bus     = &ibmebus_bus_type;
+        dev->ofdev.dev.release = ibmebus_dev_release;
+
+        /* An ibmebusdev is based on a of_device. We have to change the
+         * bus type to use our own DMA mapping operations. 
+         */       
+        if ((err = of_device_register(&dev->ofdev)) != 0) {
+                printk(KERN_ERR "%s: failed to register device (%d).\n",
+                       __FUNCTION__, err);
+                return NULL;
+        }
+        
+        device_create_file(&dev->ofdev.dev, &dev_attr_name);
+        
+        return dev;
+}
+
+static struct ibmebus_dev* __devinit ibmebus_register_device_node(
+        struct device_node *dn)
+{
+        struct ibmebus_dev *dev;
+        char *loc_code;
+        int length;
+
+        loc_code = (char *)get_property(dn, "ibm,loc-code", NULL);
+        if (!loc_code) {
+                printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
+                       __FUNCTION__, dn->name ? dn->name : "<unknown>");
+                return NULL;
+        }
+        
+        if (strlen(loc_code) == 0) {
+                printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
+                       __FUNCTION__);
+                return NULL;
+        }
+
+        dev = kmalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
+        if (!dev) {
+                return NULL;
+        }
+        memset(dev, 0, sizeof(struct ibmebus_dev));
+
+        dev->ofdev.node = of_node_get(dn);
+       
+        length = strlen(loc_code);
+        memcpy(dev->ofdev.dev.bus_id, loc_code 
+                + (length - min(length, BUS_ID_SIZE - 1)), 
+                min(length, BUS_ID_SIZE - 1));
+
+        /* Register with generic device framework. */
+        if (ibmebus_register_device_common(dev, dn->name) == NULL) {
+                kfree(dev);
+                return NULL;
+        }
+
+        return dev;
+}
+
+static void ibmebus_probe_of_nodes(char* name)
+{
+        struct device_node *dn = NULL;
+        
+        while ((dn = of_find_node_by_name(dn, name))) {
+                if (ibmebus_register_device_node(dn) == NULL) {
+                        of_node_put(dn);
+                        
+                        return;
+                }
+        }
+        
+        of_node_put(dn);
+        
+        return;
+}
+
+static void ibmebus_add_devices_by_id(struct of_device_id *idt)
+{
+        while (strlen(idt->name) > 0) {
+                ibmebus_probe_of_nodes(idt->name);
+                idt++;
+        }
+
+        return;
+}
+
+static int ibmebus_match_helper(struct device *dev, void *data)
+{
+        if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0)
+                return 1;
+        
+        return 0;
+}
+
+static int ibmebus_unregister_device(struct device *dev)
+{
+        device_remove_file(dev, &dev_attr_name);
+        of_device_unregister(to_of_device(dev));
+
+        return 0;
+}
+
+static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
+{
+        struct device *dev;
+        
+        while (strlen(idt->name) > 0) {
+                while ((dev = bus_find_device(&ibmebus_bus_type, NULL, 
+                                              (void*)idt->name,
+                                              ibmebus_match_helper))) {
+                        ibmebus_unregister_device(dev);
+                }
+                idt++;
+                
+        }
+        
+        return;
+}
+
+int ibmebus_register_driver(struct ibmebus_driver *drv)
+{
+        int err = 0;
+
+        drv->driver.name   = drv->name;
+        drv->driver.bus    = &ibmebus_bus_type;
+        drv->driver.probe  = ibmebus_bus_probe;
+        drv->driver.remove = ibmebus_bus_remove;
+
+        if ((err = driver_register(&drv->driver) != 0))
+                return err;
+
+        ibmebus_add_devices_by_id(drv->id_table);
+        
+        return 0;
+}
+EXPORT_SYMBOL(ibmebus_register_driver);
+
+void ibmebus_unregister_driver(struct ibmebus_driver *drv)
+{       
+        driver_unregister(&drv->driver);
+        ibmebus_remove_devices_by_id(drv->id_table);
+}
+EXPORT_SYMBOL(ibmebus_unregister_driver);
+
+int ibmebus_request_irq(struct ibmebus_dev *dev,
+                        u32 ist, 
+                        irqreturn_t (*handler)(int, void*, struct pt_regs *),
+                        unsigned long irq_flags, const char * devname,
+                        void *dev_id)
+{
+        unsigned int irq = virt_irq_create_mapping(ist);
+        
+        if (irq == NO_IRQ)
+                return -EINVAL;
+        
+        irq = irq_offset_up(irq);
+        
+        return request_irq(irq, handler,
+                           irq_flags, devname, dev_id);
+}
+EXPORT_SYMBOL(ibmebus_request_irq);
+
+void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
+{
+        unsigned int irq = virt_irq_create_mapping(ist);
+        
+        irq = irq_offset_up(irq);
+        free_irq(irq, dev_id);
+        
+        return;
+}
+EXPORT_SYMBOL(ibmebus_free_irq);
+
+static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
+{       
+        const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
+        struct ibmebus_driver *ebus_drv    = to_ibmebus_driver(drv);
+        const struct of_device_id *ids     = ebus_drv->id_table;
+        const struct of_device_id *found_id;
+        
+        if (!ids)
+                return 0;
+        
+        found_id = of_match_device(ids, &ebus_dev->ofdev);
+        if (found_id)
+                return 1;
+        
+        return 0;
+}
+
+struct bus_type ibmebus_bus_type = {
+        .name = "ibmebus",
+        .match = ibmebus_bus_match,
+};
+EXPORT_SYMBOL(ibmebus_bus_type);
+
+static int __init ibmebus_bus_init(void)
+{
+        int err;
+        
+        printk(KERN_INFO "IBM eBus Device Driver\n");
+        
+        err = bus_register(&ibmebus_bus_type);
+        if (err) {
+                printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
+                       __FUNCTION__);
+                return err;
+        }
+        
+        err = device_register(&ibmebus_bus_device.ofdev.dev);
+        if (err) {
+                printk(KERN_WARNING "%s: device_register returned %i\n", 
+                       __FUNCTION__, err);
+                bus_unregister(&ibmebus_bus_type);
+
+                return err;
+        }
+        
+        return 0;
+}
+__initcall(ibmebus_bus_init);