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-rw-r--r--arch/powerpc/platforms/pseries/ibmebus.c469
1 files changed, 469 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/ibmebus.c b/arch/powerpc/platforms/pseries/ibmebus.c
new file mode 100644
index 000000000000..99a6bf7f3bcf
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/ibmebus.c
@@ -0,0 +1,469 @@
+/*
+ * IBM PowerPC IBM eBus Infrastructure Support.
+ *
+ * Copyright (c) 2005 IBM Corporation
+ * Joachim Fenkes <fenkes@de.ibm.com>
+ * 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/export.h>
+#include <linux/console.h>
+#include <linux/kobject.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/of_platform.h>
+#include <asm/ibmebus.h>
+
+static struct device ibmebus_bus_device = { /* fake "parent" device */
+ .init_name = "ibmebus",
+};
+
+struct bus_type ibmebus_bus_type;
+
+/* These devices will automatically be added to the bus during init */
+static const struct of_device_id ibmebus_matches[] __initconst = {
+ { .compatible = "IBM,lhca" },
+ { .compatible = "IBM,lhea" },
+ {},
+};
+
+static void *ibmebus_alloc_coherent(struct device *dev,
+ size_t size,
+ dma_addr_t *dma_handle,
+ gfp_t flag,
+ unsigned long attrs)
+{
+ 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,
+ unsigned long attrs)
+{
+ kfree(vaddr);
+}
+
+static dma_addr_t ibmebus_map_page(struct device *dev,
+ struct page *page,
+ unsigned long offset,
+ size_t size,
+ enum dma_data_direction direction,
+ unsigned long attrs)
+{
+ return (dma_addr_t)(page_address(page) + offset);
+}
+
+static void ibmebus_unmap_page(struct device *dev,
+ dma_addr_t dma_addr,
+ size_t size,
+ enum dma_data_direction direction,
+ unsigned long attrs)
+{
+ return;
+}
+
+static int ibmebus_map_sg(struct device *dev,
+ struct scatterlist *sgl,
+ int nents, enum dma_data_direction direction,
+ unsigned long attrs)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sgl, sg, nents, i) {
+ sg->dma_address = (dma_addr_t) sg_virt(sg);
+ sg->dma_length = sg->length;
+ }
+
+ return nents;
+}
+
+static void ibmebus_unmap_sg(struct device *dev,
+ struct scatterlist *sg,
+ int nents, enum dma_data_direction direction,
+ unsigned long attrs)
+{
+ return;
+}
+
+static int ibmebus_dma_supported(struct device *dev, u64 mask)
+{
+ return mask == DMA_BIT_MASK(64);
+}
+
+static u64 ibmebus_dma_get_required_mask(struct device *dev)
+{
+ return DMA_BIT_MASK(64);
+}
+
+static const struct dma_map_ops ibmebus_dma_ops = {
+ .alloc = ibmebus_alloc_coherent,
+ .free = ibmebus_free_coherent,
+ .map_sg = ibmebus_map_sg,
+ .unmap_sg = ibmebus_unmap_sg,
+ .dma_supported = ibmebus_dma_supported,
+ .get_required_mask = ibmebus_dma_get_required_mask,
+ .map_page = ibmebus_map_page,
+ .unmap_page = ibmebus_unmap_page,
+};
+
+static int ibmebus_match_path(struct device *dev, void *data)
+{
+ struct device_node *dn = to_platform_device(dev)->dev.of_node;
+ return (dn->full_name &&
+ (strcasecmp((char *)data, dn->full_name) == 0));
+}
+
+static int ibmebus_match_node(struct device *dev, void *data)
+{
+ return to_platform_device(dev)->dev.of_node == data;
+}
+
+static int ibmebus_create_device(struct device_node *dn)
+{
+ struct platform_device *dev;
+ int ret;
+
+ dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->dev.bus = &ibmebus_bus_type;
+ dev->dev.dma_ops = &ibmebus_dma_ops;
+
+ ret = of_device_add(dev);
+ if (ret)
+ platform_device_put(dev);
+ return ret;
+}
+
+static int ibmebus_create_devices(const struct of_device_id *matches)
+{
+ struct device_node *root, *child;
+ struct device *dev;
+ int ret = 0;
+
+ root = of_find_node_by_path("/");
+
+ for_each_child_of_node(root, child) {
+ if (!of_match_node(matches, child))
+ continue;
+
+ dev = bus_find_device(&ibmebus_bus_type, NULL, child,
+ ibmebus_match_node);
+ if (dev) {
+ put_device(dev);
+ continue;
+ }
+
+ ret = ibmebus_create_device(child);
+ if (ret) {
+ printk(KERN_ERR "%s: failed to create device (%i)",
+ __func__, ret);
+ of_node_put(child);
+ break;
+ }
+ }
+
+ of_node_put(root);
+ return ret;
+}
+
+int ibmebus_register_driver(struct platform_driver *drv)
+{
+ /* If the driver uses devices that ibmebus doesn't know, add them */
+ ibmebus_create_devices(drv->driver.of_match_table);
+
+ drv->driver.bus = &ibmebus_bus_type;
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL(ibmebus_register_driver);
+
+void ibmebus_unregister_driver(struct platform_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL(ibmebus_unregister_driver);
+
+int ibmebus_request_irq(u32 ist, irq_handler_t handler,
+ unsigned long irq_flags, const char *devname,
+ void *dev_id)
+{
+ unsigned int irq = irq_create_mapping(NULL, ist);
+
+ if (!irq)
+ return -EINVAL;
+
+ return request_irq(irq, handler, irq_flags, devname, dev_id);
+}
+EXPORT_SYMBOL(ibmebus_request_irq);
+
+void ibmebus_free_irq(u32 ist, void *dev_id)
+{
+ unsigned int irq = irq_find_mapping(NULL, ist);
+
+ free_irq(irq, dev_id);
+ irq_dispose_mapping(irq);
+}
+EXPORT_SYMBOL(ibmebus_free_irq);
+
+static char *ibmebus_chomp(const char *in, size_t count)
+{
+ char *out = kmalloc(count + 1, GFP_KERNEL);
+
+ if (!out)
+ return NULL;
+
+ memcpy(out, in, count);
+ out[count] = '\0';
+ if (out[count - 1] == '\n')
+ out[count - 1] = '\0';
+
+ return out;
+}
+
+static ssize_t ibmebus_store_probe(struct bus_type *bus,
+ const char *buf, size_t count)
+{
+ struct device_node *dn = NULL;
+ struct device *dev;
+ char *path;
+ ssize_t rc = 0;
+
+ path = ibmebus_chomp(buf, count);
+ if (!path)
+ return -ENOMEM;
+
+ dev = bus_find_device(&ibmebus_bus_type, NULL, path,
+ ibmebus_match_path);
+ if (dev) {
+ put_device(dev);
+ printk(KERN_WARNING "%s: %s has already been probed\n",
+ __func__, path);
+ rc = -EEXIST;
+ goto out;
+ }
+
+ if ((dn = of_find_node_by_path(path))) {
+ rc = ibmebus_create_device(dn);
+ of_node_put(dn);
+ } else {
+ printk(KERN_WARNING "%s: no such device node: %s\n",
+ __func__, path);
+ rc = -ENODEV;
+ }
+
+out:
+ kfree(path);
+ if (rc)
+ return rc;
+ return count;
+}
+static BUS_ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe);
+
+static ssize_t ibmebus_store_remove(struct bus_type *bus,
+ const char *buf, size_t count)
+{
+ struct device *dev;
+ char *path;
+
+ path = ibmebus_chomp(buf, count);
+ if (!path)
+ return -ENOMEM;
+
+ if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
+ ibmebus_match_path))) {
+ of_device_unregister(to_platform_device(dev));
+ put_device(dev);
+
+ kfree(path);
+ return count;
+ } else {
+ printk(KERN_WARNING "%s: %s not on the bus\n",
+ __func__, path);
+
+ kfree(path);
+ return -ENODEV;
+ }
+}
+static BUS_ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove);
+
+static struct attribute *ibmbus_bus_attrs[] = {
+ &bus_attr_probe.attr,
+ &bus_attr_remove.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(ibmbus_bus);
+
+static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
+{
+ const struct of_device_id *matches = drv->of_match_table;
+
+ if (!matches)
+ return 0;
+
+ return of_match_device(matches, dev) != NULL;
+}
+
+static int ibmebus_bus_device_probe(struct device *dev)
+{
+ int error = -ENODEV;
+ struct platform_driver *drv;
+ struct platform_device *of_dev;
+
+ drv = to_platform_driver(dev->driver);
+ of_dev = to_platform_device(dev);
+
+ if (!drv->probe)
+ return error;
+
+ of_dev_get(of_dev);
+
+ if (of_driver_match_device(dev, dev->driver))
+ error = drv->probe(of_dev);
+ if (error)
+ of_dev_put(of_dev);
+
+ return error;
+}
+
+static int ibmebus_bus_device_remove(struct device *dev)
+{
+ struct platform_device *of_dev = to_platform_device(dev);
+ struct platform_driver *drv = to_platform_driver(dev->driver);
+
+ if (dev->driver && drv->remove)
+ drv->remove(of_dev);
+ return 0;
+}
+
+static void ibmebus_bus_device_shutdown(struct device *dev)
+{
+ struct platform_device *of_dev = to_platform_device(dev);
+ struct platform_driver *drv = to_platform_driver(dev->driver);
+
+ if (dev->driver && drv->shutdown)
+ drv->shutdown(of_dev);
+}
+
+/*
+ * ibmebus_bus_device_attrs
+ */
+static ssize_t devspec_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *ofdev;
+
+ ofdev = to_platform_device(dev);
+ return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
+}
+
+static ssize_t name_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *ofdev;
+
+ ofdev = to_platform_device(dev);
+ return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
+}
+
+static ssize_t modalias_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
+ buf[len] = '\n';
+ buf[len+1] = 0;
+ return len+1;
+}
+
+static struct device_attribute ibmebus_bus_device_attrs[] = {
+ __ATTR_RO(devspec),
+ __ATTR_RO(name),
+ __ATTR_RO(modalias),
+ __ATTR_NULL
+};
+
+struct bus_type ibmebus_bus_type = {
+ .name = "ibmebus",
+ .uevent = of_device_uevent_modalias,
+ .bus_groups = ibmbus_bus_groups,
+ .match = ibmebus_bus_bus_match,
+ .probe = ibmebus_bus_device_probe,
+ .remove = ibmebus_bus_device_remove,
+ .shutdown = ibmebus_bus_device_shutdown,
+ .dev_attrs = ibmebus_bus_device_attrs,
+};
+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",
+ __func__);
+ return err;
+ }
+
+ err = device_register(&ibmebus_bus_device);
+ if (err) {
+ printk(KERN_WARNING "%s: device_register returned %i\n",
+ __func__, err);
+ bus_unregister(&ibmebus_bus_type);
+
+ return err;
+ }
+
+ err = ibmebus_create_devices(ibmebus_matches);
+ if (err) {
+ device_unregister(&ibmebus_bus_device);
+ bus_unregister(&ibmebus_bus_type);
+ return err;
+ }
+
+ return 0;
+}
+postcore_initcall(ibmebus_bus_init);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.