*
* Copyright (c) 2002-3 Patrick Mochel
* Copyright (c) 2002-3 Open Source Development Labs
- *
+ *
* This file is released under the GPLv2
*
* Please see Documentation/driver-model/platform.txt for more
#include <linux/device.h>
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/bootmem.h>
+#include <linux/err.h>
struct device platform_bus = {
.bus_id = "platform",
};
+/**
+ * platform_get_resource - get a resource for a device
+ * @dev: platform device
+ * @type: resource type
+ * @num: resource index
+ */
+struct resource *
+platform_get_resource(struct platform_device *dev, unsigned int type,
+ unsigned int num)
+{
+ int i;
+
+ for (i = 0; i < dev->num_resources; i++) {
+ struct resource *r = &dev->resource[i];
+
+ if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|
+ IORESOURCE_IRQ|IORESOURCE_DMA))
+ == type)
+ if (num-- == 0)
+ return r;
+ }
+ return NULL;
+}
+
+/**
+ * platform_get_irq - get an IRQ for a device
+ * @dev: platform device
+ * @num: IRQ number index
+ */
+int platform_get_irq(struct platform_device *dev, unsigned int num)
+{
+ struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
+
+ return r ? r->start : 0;
+}
+
+/**
+ * platform_add_devices - add a numbers of platform devices
+ * @devs: array of platform devices to add
+ * @num: number of platform devices in array
+ */
+int platform_add_devices(struct platform_device **devs, int num)
+{
+ int i, ret = 0;
+
+ for (i = 0; i < num; i++) {
+ ret = platform_device_register(devs[i]);
+ if (ret) {
+ while (--i >= 0)
+ platform_device_unregister(devs[i]);
+ break;
+ }
+ }
+
+ return ret;
+}
+
/**
* platform_device_register - add a platform-level device
* @dev: platform device we're adding
*/
int platform_device_register(struct platform_device * pdev)
{
+ int i, ret = 0;
+
if (!pdev)
return -EINVAL;
pdev->dev.parent = &platform_bus;
pdev->dev.bus = &platform_bus_type;
-
- snprintf(pdev->dev.bus_id,BUS_ID_SIZE,"%s%u",pdev->name,pdev->id);
+
+ if (pdev->id != -1)
+ snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s%u", pdev->name, pdev->id);
+ else
+ strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE);
+
+ for (i = 0; i < pdev->num_resources; i++) {
+ struct resource *p, *r = &pdev->resource[i];
+
+ r->name = pdev->dev.bus_id;
+
+ p = NULL;
+ if (r->flags & IORESOURCE_MEM)
+ p = &iomem_resource;
+ else if (r->flags & IORESOURCE_IO)
+ p = &ioport_resource;
+
+ if (p && request_resource(p, r)) {
+ printk(KERN_ERR
+ "%s: failed to claim resource %d\n",
+ pdev->dev.bus_id, i);
+ ret = -EBUSY;
+ goto failed;
+ }
+ }
pr_debug("Registering platform device '%s'. Parent at %s\n",
- pdev->dev.bus_id,pdev->dev.parent->bus_id);
- return device_register(&pdev->dev);
+ pdev->dev.bus_id, pdev->dev.parent->bus_id);
+
+ ret = device_register(&pdev->dev);
+ if (ret == 0)
+ return ret;
+
+ failed:
+ while (--i >= 0)
+ if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO))
+ release_resource(&pdev->resource[i]);
+ return ret;
}
+/**
+ * platform_device_unregister - remove a platform-level device
+ * @dev: platform device we're removing
+ *
+ * Note that this function will also release all memory- and port-based
+ * resources owned by the device (@dev->resource).
+ */
void platform_device_unregister(struct platform_device * pdev)
{
- if (pdev)
+ int i;
+
+ if (pdev) {
+ for (i = 0; i < pdev->num_resources; i++) {
+ struct resource *r = &pdev->resource[i];
+ if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO))
+ release_resource(r);
+ }
+
device_unregister(&pdev->dev);
+ }
+}
+
+struct platform_object {
+ struct platform_device pdev;
+ struct resource resources[0];
+};
+
+static void platform_device_release_simple(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ kfree(container_of(pdev, struct platform_object, pdev));
+}
+
+/**
+ * platform_device_register_simple
+ * @name: base name of the device we're adding
+ * @id: instance id
+ * @res: set of resources that needs to be allocated for the device
+ * @num: number of resources
+ *
+ * This function creates a simple platform device that requires minimal
+ * resource and memory management. Canned release function freeing
+ * memory allocated for the device allows drivers using such devices
+ * to be unloaded iwithout waiting for the last reference to the device
+ * to be dropped.
+ */
+struct platform_device *platform_device_register_simple(char *name, unsigned int id,
+ struct resource *res, unsigned int num)
+{
+ struct platform_object *pobj;
+ int retval;
+
+ pobj = kmalloc(sizeof(struct platform_object) + sizeof(struct resource) * num, GFP_KERNEL);
+ if (!pobj) {
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ memset(pobj, 0, sizeof(*pobj));
+ pobj->pdev.name = name;
+ pobj->pdev.id = id;
+ pobj->pdev.dev.release = platform_device_release_simple;
+
+ if (num) {
+ memcpy(pobj->resources, res, sizeof(struct resource) * num);
+ pobj->pdev.resource = pobj->resources;
+ pobj->pdev.num_resources = num;
+ }
+
+ retval = platform_device_register(&pobj->pdev);
+ if (retval)
+ goto error;
+
+ return &pobj->pdev;
+
+error:
+ kfree(pobj);
+ return ERR_PTR(retval);
}
* @dev: device.
* @drv: driver.
*
- * Platform device IDs are assumed to be encoded like this:
- * "<name><instance>", where <name> is a short description of the
- * type of device, like "pci" or "floppy", and <instance> is the
+ * Platform device IDs are assumed to be encoded like this:
+ * "<name><instance>", where <name> is a short description of the
+ * type of device, like "pci" or "floppy", and <instance> is the
* enumerated instance of the device, like '0' or '42'.
- * Driver IDs are simply "<name>".
- * So, extract the <name> from the platform_device structure,
- * and compare it against the name of the driver. Return whether
+ * Driver IDs are simply "<name>".
+ * So, extract the <name> from the platform_device structure,
+ * and compare it against the name of the driver. Return whether
* they match or not.
*/
return bus_register(&platform_bus_type);
}
+#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
+u64 dma_get_required_mask(struct device *dev)
+{
+ u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
+ u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
+ u64 mask;
+
+ if (!high_totalram) {
+ /* convert to mask just covering totalram */
+ low_totalram = (1 << (fls(low_totalram) - 1));
+ low_totalram += low_totalram - 1;
+ mask = low_totalram;
+ } else {
+ high_totalram = (1 << (fls(high_totalram) - 1));
+ high_totalram += high_totalram - 1;
+ mask = (((u64)high_totalram) << 32) + 0xffffffff;
+ }
+ return mask & *dev->dma_mask;
+}
+EXPORT_SYMBOL(dma_get_required_mask);
+#endif
+
EXPORT_SYMBOL(platform_bus);
EXPORT_SYMBOL(platform_bus_type);
EXPORT_SYMBOL(platform_device_register);
+EXPORT_SYMBOL(platform_device_register_simple);
EXPORT_SYMBOL(platform_device_unregister);
+EXPORT_SYMBOL(platform_get_irq);
+EXPORT_SYMBOL(platform_get_resource);
git://git.onelab.eu / linux-2.6.git / blobdiff