![Russell King](/assets/img/avatar_default.png)
AMBA device resources were being reported as: 10004000-10004fff : <BAD> This is because dev_name() was returning NULL prior to device_register. Ensure that the struct device is properly initialized, and the name is set before adding it to the device tree. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
384 lines
8.9 KiB
C
384 lines
8.9 KiB
C
/*
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* linux/arch/arm/common/amba.c
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*
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* Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/amba/bus.h>
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#include <asm/irq.h>
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#include <asm/sizes.h>
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#define to_amba_device(d) container_of(d, struct amba_device, dev)
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#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
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static struct amba_id *
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amba_lookup(struct amba_id *table, struct amba_device *dev)
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{
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int ret = 0;
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while (table->mask) {
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ret = (dev->periphid & table->mask) == table->id;
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if (ret)
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break;
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table++;
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}
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return ret ? table : NULL;
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}
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static int amba_match(struct device *dev, struct device_driver *drv)
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{
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struct amba_device *pcdev = to_amba_device(dev);
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struct amba_driver *pcdrv = to_amba_driver(drv);
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return amba_lookup(pcdrv->id_table, pcdev) != NULL;
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}
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#ifdef CONFIG_HOTPLUG
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static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct amba_device *pcdev = to_amba_device(dev);
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int retval = 0;
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retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
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return retval;
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}
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#else
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#define amba_uevent NULL
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#endif
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static int amba_suspend(struct device *dev, pm_message_t state)
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{
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struct amba_driver *drv = to_amba_driver(dev->driver);
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int ret = 0;
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if (dev->driver && drv->suspend)
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ret = drv->suspend(to_amba_device(dev), state);
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return ret;
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}
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static int amba_resume(struct device *dev)
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{
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struct amba_driver *drv = to_amba_driver(dev->driver);
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int ret = 0;
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if (dev->driver && drv->resume)
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ret = drv->resume(to_amba_device(dev));
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return ret;
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}
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#define amba_attr_func(name,fmt,arg...) \
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static ssize_t name##_show(struct device *_dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct amba_device *dev = to_amba_device(_dev); \
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return sprintf(buf, fmt, arg); \
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}
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#define amba_attr(name,fmt,arg...) \
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amba_attr_func(name,fmt,arg) \
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static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
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amba_attr_func(id, "%08x\n", dev->periphid);
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amba_attr(irq0, "%u\n", dev->irq[0]);
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amba_attr(irq1, "%u\n", dev->irq[1]);
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amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
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(unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
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dev->res.flags);
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static struct device_attribute amba_dev_attrs[] = {
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__ATTR_RO(id),
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__ATTR_RO(resource),
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__ATTR_NULL,
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};
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/*
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* Primecells are part of the Advanced Microcontroller Bus Architecture,
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* so we call the bus "amba".
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*/
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static struct bus_type amba_bustype = {
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.name = "amba",
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.dev_attrs = amba_dev_attrs,
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.match = amba_match,
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.uevent = amba_uevent,
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.suspend = amba_suspend,
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.resume = amba_resume,
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};
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static int __init amba_init(void)
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{
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return bus_register(&amba_bustype);
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}
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postcore_initcall(amba_init);
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/*
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* These are the device model conversion veneers; they convert the
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* device model structures to our more specific structures.
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*/
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static int amba_probe(struct device *dev)
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{
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struct amba_device *pcdev = to_amba_device(dev);
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struct amba_driver *pcdrv = to_amba_driver(dev->driver);
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struct amba_id *id;
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id = amba_lookup(pcdrv->id_table, pcdev);
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return pcdrv->probe(pcdev, id);
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}
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static int amba_remove(struct device *dev)
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{
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struct amba_driver *drv = to_amba_driver(dev->driver);
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return drv->remove(to_amba_device(dev));
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}
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static void amba_shutdown(struct device *dev)
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{
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struct amba_driver *drv = to_amba_driver(dev->driver);
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drv->shutdown(to_amba_device(dev));
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}
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/**
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* amba_driver_register - register an AMBA device driver
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* @drv: amba device driver structure
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*
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* Register an AMBA device driver with the Linux device model
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* core. If devices pre-exist, the drivers probe function will
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* be called.
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*/
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int amba_driver_register(struct amba_driver *drv)
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{
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drv->drv.bus = &amba_bustype;
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#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
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SETFN(probe);
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SETFN(remove);
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SETFN(shutdown);
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return driver_register(&drv->drv);
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}
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/**
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* amba_driver_unregister - remove an AMBA device driver
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* @drv: AMBA device driver structure to remove
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*
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* Unregister an AMBA device driver from the Linux device
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* model. The device model will call the drivers remove function
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* for each device the device driver is currently handling.
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*/
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void amba_driver_unregister(struct amba_driver *drv)
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{
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driver_unregister(&drv->drv);
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}
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static void amba_device_release(struct device *dev)
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{
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struct amba_device *d = to_amba_device(dev);
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if (d->res.parent)
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release_resource(&d->res);
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kfree(d);
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}
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/**
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* amba_device_register - register an AMBA device
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* @dev: AMBA device to register
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* @parent: parent memory resource
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*
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* Setup the AMBA device, reading the cell ID if present.
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* Claim the resource, and register the AMBA device with
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* the Linux device manager.
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*/
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int amba_device_register(struct amba_device *dev, struct resource *parent)
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{
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u32 pid, cid;
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void __iomem *tmp;
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int i, ret;
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device_initialize(&dev->dev);
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/*
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* Copy from device_add
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*/
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if (dev->dev.init_name) {
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dev_set_name(&dev->dev, "%s", dev->dev.init_name);
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dev->dev.init_name = NULL;
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}
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dev->dev.release = amba_device_release;
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dev->dev.bus = &amba_bustype;
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dev->dev.dma_mask = &dev->dma_mask;
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dev->res.name = dev_name(&dev->dev);
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if (!dev->dev.coherent_dma_mask && dev->dma_mask)
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dev_warn(&dev->dev, "coherent dma mask is unset\n");
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ret = request_resource(parent, &dev->res);
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if (ret)
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goto err_out;
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tmp = ioremap(dev->res.start, SZ_4K);
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if (!tmp) {
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ret = -ENOMEM;
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goto err_release;
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}
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for (pid = 0, i = 0; i < 4; i++)
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pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8);
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for (cid = 0, i = 0; i < 4; i++)
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cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8);
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iounmap(tmp);
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if (cid == 0xb105f00d)
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dev->periphid = pid;
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if (!dev->periphid) {
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ret = -ENODEV;
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goto err_release;
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}
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ret = device_add(&dev->dev);
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if (ret)
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goto err_release;
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if (dev->irq[0] != NO_IRQ)
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ret = device_create_file(&dev->dev, &dev_attr_irq0);
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if (ret == 0 && dev->irq[1] != NO_IRQ)
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ret = device_create_file(&dev->dev, &dev_attr_irq1);
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if (ret == 0)
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return ret;
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device_unregister(&dev->dev);
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err_release:
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release_resource(&dev->res);
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err_out:
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return ret;
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}
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/**
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* amba_device_unregister - unregister an AMBA device
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* @dev: AMBA device to remove
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*
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* Remove the specified AMBA device from the Linux device
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* manager. All files associated with this object will be
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* destroyed, and device drivers notified that the device has
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* been removed. The AMBA device's resources including
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* the amba_device structure will be freed once all
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* references to it have been dropped.
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*/
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void amba_device_unregister(struct amba_device *dev)
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{
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device_unregister(&dev->dev);
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}
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struct find_data {
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struct amba_device *dev;
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struct device *parent;
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const char *busid;
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unsigned int id;
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unsigned int mask;
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};
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static int amba_find_match(struct device *dev, void *data)
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{
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struct find_data *d = data;
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struct amba_device *pcdev = to_amba_device(dev);
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int r;
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r = (pcdev->periphid & d->mask) == d->id;
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if (d->parent)
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r &= d->parent == dev->parent;
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if (d->busid)
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r &= strcmp(dev_name(dev), d->busid) == 0;
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if (r) {
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get_device(dev);
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d->dev = pcdev;
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}
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return r;
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}
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/**
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* amba_find_device - locate an AMBA device given a bus id
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* @busid: bus id for device (or NULL)
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* @parent: parent device (or NULL)
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* @id: peripheral ID (or 0)
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* @mask: peripheral ID mask (or 0)
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*
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* Return the AMBA device corresponding to the supplied parameters.
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* If no device matches, returns NULL.
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*
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* NOTE: When a valid device is found, its refcount is
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* incremented, and must be decremented before the returned
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* reference.
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*/
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struct amba_device *
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amba_find_device(const char *busid, struct device *parent, unsigned int id,
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unsigned int mask)
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{
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struct find_data data;
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data.dev = NULL;
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data.parent = parent;
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data.busid = busid;
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data.id = id;
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data.mask = mask;
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bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
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return data.dev;
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}
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/**
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* amba_request_regions - request all mem regions associated with device
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* @dev: amba_device structure for device
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* @name: name, or NULL to use driver name
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*/
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int amba_request_regions(struct amba_device *dev, const char *name)
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{
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int ret = 0;
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if (!name)
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name = dev->dev.driver->name;
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if (!request_mem_region(dev->res.start, SZ_4K, name))
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ret = -EBUSY;
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return ret;
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}
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/**
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* amba_release_regions - release mem regions assoicated with device
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* @dev: amba_device structure for device
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*
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* Release regions claimed by a successful call to amba_request_regions.
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*/
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void amba_release_regions(struct amba_device *dev)
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{
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release_mem_region(dev->res.start, SZ_4K);
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}
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EXPORT_SYMBOL(amba_driver_register);
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EXPORT_SYMBOL(amba_driver_unregister);
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EXPORT_SYMBOL(amba_device_register);
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EXPORT_SYMBOL(amba_device_unregister);
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EXPORT_SYMBOL(amba_find_device);
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EXPORT_SYMBOL(amba_request_regions);
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EXPORT_SYMBOL(amba_release_regions);
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