rsrc_nonstatic.c

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static void
pcmcia_align(void *align_data, struct resource *res, resource_size_t size,
		resource_size_t align)
{
	struct pcmcia_align_data *data = align_data;
	struct resource_map *m;

	pcmcia_common_align(data, res, size, align);

	for (m = data->map->next; m != data->map; m = m->next) {
		unsigned long start = m->base;
		unsigned long end = m->base + m->num - 1;

		/*
		 * If the lower resources are not available, try aligning
		 * to this entry of the resource database to see if it'll
		 * fit here.
		 */
		if (res->start < start) {
			res->start = start;
			pcmcia_common_align(data, res, size, align);
		}

		/*
		 * If we're above the area which was passed in, there's
		 * no point proceeding.
		 */
		if (res->start >= res->end)
			break;

		if ((res->start + size - 1) <= end)
			break;
	}

	/*
	 * If we failed to find something suitable, ensure we fail.
	 */
	if (m == data->map)
		res->start = res->end;
}

/*
 * Adjust an existing IO region allocation, but making sure that we don't
 * encroach outside the resources which the user supplied.
 */
static int nonstatic_adjust_io_region(struct resource *res, unsigned long r_start,
				      unsigned long r_end, struct pcmcia_socket *s)
{
	struct resource_map *m;
	struct socket_data *s_data = s->resource_data;
	int ret = -ENOMEM;

	mutex_lock(&rsrc_mutex);
	for (m = s_data->io_db.next; m != &s_data->io_db; m = m->next) {
		unsigned long start = m->base;
		unsigned long end = m->base + m->num - 1;

		if (start > r_start || r_end > end)
			continue;

		ret = adjust_resource(res, r_start, r_end - r_start + 1);
		break;
	}
	mutex_unlock(&rsrc_mutex);

	return ret;
}

/*======================================================================

    These find ranges of I/O ports or memory addresses that are not
    currently allocated by other devices.

    The 'align' field should reflect the number of bits of address
    that need to be preserved from the initial value of *base.  It
    should be a power of two, greater than or equal to 'num'.  A value
    of 0 means that all bits of *base are significant.  *base should
    also be strictly less than 'align'.

======================================================================*/

static struct resource *nonstatic_find_io_region(unsigned long base, int num,
		   unsigned long align, struct pcmcia_socket *s)
{
	struct resource *res = make_resource(0, num, IORESOURCE_IO, s->dev.bus_id);
	struct socket_data *s_data = s->resource_data;
	struct pcmcia_align_data data;
	unsigned long min = base;
	int ret;

	if (align == 0)
		align = 0x10000;

	data.mask = align - 1;
	data.offset = base & data.mask;
	data.map = &s_data->io_db;

	mutex_lock(&rsrc_mutex);
#ifdef CONFIG_PCI
	if (s->cb_dev) {
		ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
					     min, 0, pcmcia_align, &data);
	} else
#endif
		ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
					1, pcmcia_align, &data);
	mutex_unlock(&rsrc_mutex);

	if (ret != 0) {
		kfree(res);
		res = NULL;
	}
	return res;
}

static struct resource * nonstatic_find_mem_region(u_long base, u_long num,
		u_long align, int low, struct pcmcia_socket *s)
{
	struct resource *res = make_resource(0, num, IORESOURCE_MEM, s->dev.bus_id);
	struct socket_data *s_data = s->resource_data;
	struct pcmcia_align_data data;
	unsigned long min, max;
	int ret, i;

	low = low || !(s->features & SS_CAP_PAGE_REGS);

	data.mask = align - 1;
	data.offset = base & data.mask;
	data.map = &s_data->mem_db;

	for (i = 0; i < 2; i++) {
		if (low) {
			max = 0x100000UL;
			min = base < max ? base : 0;
		} else {
			max = ~0UL;
			min = 0x100000UL + base;
		}

		mutex_lock(&rsrc_mutex);
#ifdef CONFIG_PCI
		if (s->cb_dev) {
			ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num,
						     1, min, 0,
						     pcmcia_align, &data);
		} else
#endif
			ret = allocate_resource(&iomem_resource, res, num, min,
						max, 1, pcmcia_align, &data);
		mutex_unlock(&rsrc_mutex);
		if (ret == 0 || low)
			break;
		low = 1;
	}

	if (ret != 0) {
		kfree(res);
		res = NULL;
	}
	return res;
}


static int adjust_memory(struct pcmcia_socket *s, unsigned int action, unsigned long start, unsigned long end)
{
	struct socket_data *data = s->resource_data;
	unsigned long size = end - start + 1;
	int ret = 0;

	if (end < start)
		return -EINVAL;

	mutex_lock(&rsrc_mutex);
	switch (action) {
	case ADD_MANAGED_RESOURCE:
		ret = add_interval(&data->mem_db, start, size);
		break;
	case REMOVE_MANAGED_RESOURCE:
		ret = sub_interval(&data->mem_db, start, size);
		if (!ret) {
			struct pcmcia_socket *socket;
			down_read(&pcmcia_socket_list_rwsem);
			list_for_each_entry(socket, &pcmcia_socket_list, socket_list)
				release_cis_mem(socket);
			up_read(&pcmcia_socket_list_rwsem);
		}
		break;
	default:
		ret = -EINVAL;
	}
	mutex_unlock(&rsrc_mutex);

	return ret;
}


static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long start, unsigned long end)
{
	struct socket_data *data = s->resource_data;
	unsigned long size = end - start + 1;
	int ret = 0;

	if (end < start)
		return -EINVAL;

	if (end > IO_SPACE_LIMIT)
		return -EINVAL;

	mutex_lock(&rsrc_mutex);
	switch (action) {
	case ADD_MANAGED_RESOURCE:
		if (add_interval(&data->io_db, start, size) != 0) {
			ret = -EBUSY;
			break;
		}
#ifdef CONFIG_PCMCIA_PROBE
		if (probe_io)
			do_io_probe(s, start, size);
#endif
		break;
	case REMOVE_MANAGED_RESOURCE:
		sub_interval(&data->io_db, start, size);
		break;
	default:
		ret = -EINVAL;
		break;
	}
	mutex_unlock(&rsrc_mutex);

	return ret;
}


static int nonstatic_adjust_resource_info(struct pcmcia_socket *s, adjust_t *adj)
{
	unsigned long end;

	switch (adj->Resource) {
	case RES_MEMORY_RANGE:
		end = adj->resource.memory.Base + adj->resource.memory.Size - 1;
		return adjust_memory(s, adj->Action, adj->resource.memory.Base, end);
	case RES_IO_RANGE:
		end = adj->resource.io.BasePort + adj->resource.io.NumPorts - 1;
		return adjust_io(s, adj->Action, adj->resource.io.BasePort, end);
	}
	return CS_UNSUPPORTED_FUNCTION;
}

#ifdef CONFIG_PCI
static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
{
	struct resource *res;
	int i, done = 0;

	if (!s->cb_dev || !s->cb_dev->bus)
		return -ENODEV;

#if defined(CONFIG_X86)
	/* If this is the root bus, the risk of hitting
	 * some strange system devices which aren't protected
	 * by either ACPI resource tables or properly requested
	 * resources is too big. Therefore, don't do auto-adding
	 * of resources at the moment.
	 */
	if (s->cb_dev->bus->number == 0)
		return -EINVAL;
#endif

	for (i=0; i < PCI_BUS_NUM_RESOURCES; i++) {
		res = s->cb_dev->bus->resource[i];
		if (!res)
			continue;

		if (res->flags & IORESOURCE_IO) {
			if (res == &ioport_resource)
				continue;
			printk(KERN_INFO "pcmcia: parent PCI bridge I/O "
				"window: 0x%llx - 0x%llx\n",
				(unsigned long long)res->start,
				(unsigned long long)res->end);
			if (!adjust_io(s, ADD_MANAGED_RESOURCE, res->start, res->end))
				done |= IORESOURCE_IO;

		}

		if (res->flags & IORESOURCE_MEM) {
			if (res == &iomem_resource)
				continue;
			printk(KERN_INFO "pcmcia: parent PCI bridge Memory "
				"window: 0x%llx - 0x%llx\n",
				(unsigned long long)res->start,
				(unsigned long long)res->end);
			if (!adjust_memory(s, ADD_MANAGED_RESOURCE, res->start, res->end))
				done |= IORESOURCE_MEM;
		}
	}

	/* if we got at least one of IO, and one of MEM, we can be glad and
	 * activate the PCMCIA subsystem */
	if (done == (IORESOURCE_MEM | IORESOURCE_IO))
		s->resource_setup_done = 1;

	return 0;
}

#else

static inline int nonstatic_autoadd_resources(struct pcmcia_socket *s)
{
	return -ENODEV;
}

#endif


static int nonstatic_init(struct pcmcia_socket *s)
{
	struct socket_data *data;

	data = kzalloc(sizeof(struct socket_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->mem_db.next = &data->mem_db;
	data->io_db.next = &data->io_db;

	s->resource_data = (void *) data;

	nonstatic_autoadd_resources(s);

	return 0;
}

static void nonstatic_release_resource_db(struct pcmcia_socket *s)
{
	struct socket_data *data = s->resource_data;
	struct resource_map *p, *q;

	mutex_lock(&rsrc_mutex);
	for (p = data->mem_db.next; p != &data->mem_db; p = q) {
		q = p->next;
		kfree(p);
	}
	for (p = data->io_db.next; p != &data->io_db; p = q) {
		q = p->next;
		kfree(p);
	}
	mutex_unlock(&rsrc_mutex);
}


struct pccard_resource_ops pccard_nonstatic_ops = {
	.validate_mem = pcmcia_nonstatic_validate_mem,
	.adjust_io_region = nonstatic_adjust_io_region,
	.find_io = nonstatic_find_io_region,
	.find_mem = nonstatic_find_mem_region,
	.adjust_resource = nonstatic_adjust_resource_info,
	.init = nonstatic_init,
	.exit = nonstatic_release_resource_db,
};
EXPORT_SYMBOL(pccard_nonstatic_ops);


/* sysfs interface to the resource database */

static ssize_t show_io_db(struct device *dev,
			  struct device_attribute *attr, char *buf)
{
	struct pcmcia_socket *s = dev_get_drvdata(dev);
	struct socket_data *data;
	struct resource_map *p;
	ssize_t ret = 0;

	mutex_lock(&rsrc_mutex);
	data = s->resource_data;

	for (p = data->io_db.next; p != &data->io_db; p = p->next) {
		if (ret > (PAGE_SIZE - 10))
			continue;
		ret += snprintf (&buf[ret], (PAGE_SIZE - ret - 1),
				 "0x%08lx - 0x%08lx\n",
				 ((unsigned long) p->base),
				 ((unsigned long) p->base + p->num - 1));
	}

	mutex_unlock(&rsrc_mutex);
	return (ret);
}

static ssize_t store_io_db(struct device *dev,
			   struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct pcmcia_socket *s = dev_get_drvdata(dev);
	unsigned long start_addr, end_addr;
	unsigned int add = ADD_MANAGED_RESOURCE;
	ssize_t ret = 0;

	ret = sscanf (buf, "+ 0x%lx - 0x%lx", &start_addr, &end_addr);
	if (ret != 2) {
		ret = sscanf (buf, "- 0x%lx - 0x%lx", &start_addr, &end_addr);
		add = REMOVE_MANAGED_RESOURCE;
		if (ret != 2) {
			ret = sscanf (buf, "0x%lx - 0x%lx", &start_addr, &end_addr);
			add = ADD_MANAGED_RESOURCE;
			if (ret != 2)
				return -EINVAL;
		}
	}
	if (end_addr < start_addr)
		return -EINVAL;

	ret = adjust_io(s, add, start_addr, end_addr);
	if (!ret)
		s->resource_setup_new = 1;

	return ret ? ret : count;
}
static DEVICE_ATTR(available_resources_io, 0600, show_io_db, store_io_db);

static ssize_t show_mem_db(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct pcmcia_socket *s = dev_get_drvdata(dev);
	struct socket_data *data;
	struct resource_map *p;
	ssize_t ret = 0;

	mutex_lock(&rsrc_mutex);
	data = s->resource_data;

	for (p = data->mem_db.next; p != &data->mem_db; p = p->next) {
		if (ret > (PAGE_SIZE - 10))
			continue;
		ret += snprintf (&buf[ret], (PAGE_SIZE - ret - 1),
				 "0x%08lx - 0x%08lx\n",
				 ((unsigned long) p->base),
				 ((unsigned long) p->base + p->num - 1));
	}

	mutex_unlock(&rsrc_mutex);
	return (ret);
}

static ssize_t store_mem_db(struct device *dev,
			    struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct pcmcia_socket *s = dev_get_drvdata(dev);
	unsigned long start_addr, end_addr;
	unsigned int add = ADD_MANAGED_RESOURCE;
	ssize_t ret = 0;

	ret = sscanf (buf, "+ 0x%lx - 0x%lx", &start_addr, &end_addr);
	if (ret != 2) {
		ret = sscanf (buf, "- 0x%lx - 0x%lx", &start_addr, &end_addr);
		add = REMOVE_MANAGED_RESOURCE;
		if (ret != 2) {
			ret = sscanf (buf, "0x%lx - 0x%lx", &start_addr, &end_addr);
			add = ADD_MANAGED_RESOURCE;
			if (ret != 2)
				return -EINVAL;
		}
	}
	if (end_addr < start_addr)
		return -EINVAL;

	ret = adjust_memory(s, add, start_addr, end_addr);
	if (!ret)
		s->resource_setup_new = 1;

	return ret ? ret : count;
}
static DEVICE_ATTR(available_resources_mem, 0600, show_mem_db, store_mem_db);

static struct device_attribute *pccard_rsrc_attributes[] = {
	&dev_attr_available_resources_io,
	&dev_attr_available_resources_mem,
	NULL,
};

static int __devinit pccard_sysfs_add_rsrc(struct device *dev,
					   struct class_interface *class_intf)
{
	struct pcmcia_socket *s = dev_get_drvdata(dev);
	struct device_attribute **attr;
	int ret = 0;
	if (s->resource_ops != &pccard_nonstatic_ops)
		return 0;

	for (attr = pccard_rsrc_attributes; *attr; attr++) {
		ret = device_create_file(dev, *attr);
		if (ret)
			break;
	}

	return ret;
}

static void __devexit pccard_sysfs_remove_rsrc(struct device *dev,
					       struct class_interface *class_intf)
{
	struct pcmcia_socket *s = dev_get_drvdata(dev);
	struct device_attribute **attr;

	if (s->resource_ops != &pccard_nonstatic_ops)
		return;

	for (attr = pccard_rsrc_attributes; *attr; attr++)
		device_remove_file(dev, *attr);
}

static struct class_interface pccard_rsrc_interface = {
	.class = &pcmcia_socket_class,
	.add_dev = &pccard_sysfs_add_rsrc,
	.remove_dev = __devexit_p(&pccard_sysfs_remove_rsrc),
};

static int __init nonstatic_sysfs_init(void)
{
	return class_interface_register(&pccard_rsrc_interface);
}

static void __exit nonstatic_sysfs_exit(void)
{
	class_interface_unregister(&pccard_rsrc_interface);
}

module_init(nonstatic_sysfs_init);
module_exit(nonstatic_sysfs_exit);