Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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 000000000..c7c1140c1
--- /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 (of_find_node_by_path(data) == dn);
+}
+
+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, 0200, 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, 0200, 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, "%pOF\n", ofdev->dev.of_node);
+}
+static DEVICE_ATTR_RO(devspec);
+
+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 DEVICE_ATTR_RO(name);
+
+static ssize_t modalias_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	return of_device_modalias(dev, buf, PAGE_SIZE);
+}
+static DEVICE_ATTR_RO(modalias);
+
+static struct attribute *ibmebus_bus_device_attrs[] = {
+	&dev_attr_devspec.attr,
+	&dev_attr_name.attr,
+	&dev_attr_modalias.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(ibmebus_bus_device);
+
+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_groups = ibmebus_bus_device_groups,
+};
+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);