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-rw-r--r--arch/powerpc/kernel/ibmebus.c396
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 0000000000000..e47d40ac6f39d
--- /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);
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