#include <linux/err.h>
#include <linux/pci.h>
#include <linux/io.h>
#include <linux/gfp.h>
#include <linux/export.h>

void devm_ioremap_release(struct device *dev, void *res)
{
        iounmap(*(void __iomem **)res);
}

static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
{
        return *(void **)res == match_data;
}

/**
 * devm_ioremap - Managed ioremap()
 * @dev: Generic device to remap IO address for
 * @offset: BUS offset to map
 * @size: Size of map
 *
 * Managed ioremap().  Map is automatically unmapped on driver detach.
 */
void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
                           unsigned long size)
{
        void __iomem **ptr, *addr;

        ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
        if (!ptr)
                return NULL;

        addr = ioremap(offset, size);
        if (addr) {
                *ptr = addr;
                devres_add(dev, ptr);
        } else
                devres_free(ptr);

        return addr;
}
EXPORT_SYMBOL(devm_ioremap);

/**
 * devm_ioremap_nocache - Managed ioremap_nocache()
 * @dev: Generic device to remap IO address for
 * @offset: BUS offset to map
 * @size: Size of map
 *
 * Managed ioremap_nocache().  Map is automatically unmapped on driver
 * detach.
 */
void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
                                   unsigned long size)
{
        void __iomem **ptr, *addr;

        ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
        if (!ptr)
                return NULL;

        addr = ioremap_nocache(offset, size);
        if (addr) {
                *ptr = addr;
                devres_add(dev, ptr);
        } else
                devres_free(ptr);

        return addr;
}
EXPORT_SYMBOL(devm_ioremap_nocache);

/**
 * devm_iounmap - Managed iounmap()
 * @dev: Generic device to unmap for
 * @addr: Address to unmap
 *
 * Managed iounmap().  @addr must have been mapped using devm_ioremap*().
 */
void devm_iounmap(struct device *dev, void __iomem *addr)
{
        WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
                               (void *)addr));
        iounmap(addr);
}
EXPORT_SYMBOL(devm_iounmap);

/**
 * devm_ioremap_resource() - check, request region, and ioremap resource
 * @dev: generic device to handle the resource for
 * @res: resource to be handled
 *
 * Checks that a resource is a valid memory region, requests the memory region
 * and ioremaps it either as cacheable or as non-cacheable memory depending on
 * the resource's flags. All operations are managed and will be undone on
 * driver detach.
 *
 * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
 * on failure. Usage example:
 *
 *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 *      base = devm_ioremap_resource(&pdev->dev, res);
 *      if (IS_ERR(base))
 *              return PTR_ERR(base);
 */
void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
{
        resource_size_t size;
        const char *name;
        void __iomem *dest_ptr;

        BUG_ON(!dev);

        if (!res || resource_type(res) != IORESOURCE_MEM) {
                dev_err(dev, "invalid resource\n");
                return ERR_PTR(-EINVAL);
        }

        size = resource_size(res);
        name = res->name ?: dev_name(dev);

        if (!devm_request_mem_region(dev, res->start, size, name)) {
                dev_err(dev, "can't request region for resource %pR\n", res);
                return ERR_PTR(-EBUSY);
        }

        if (res->flags & IORESOURCE_CACHEABLE)
                dest_ptr = devm_ioremap(dev, res->start, size);
        else
                dest_ptr = devm_ioremap_nocache(dev, res->start, size);

        if (!dest_ptr) {
                dev_err(dev, "ioremap failed for resource %pR\n", res);
                devm_release_mem_region(dev, res->start, size);
                dest_ptr = ERR_PTR(-ENOMEM);
        }

        return dest_ptr;
}
EXPORT_SYMBOL(devm_ioremap_resource);

/**
 * devm_request_and_ioremap() - Check, request region, and ioremap resource
 * @dev: Generic device to handle the resource for
 * @res: resource to be handled
 *
 * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
 * everything is undone on driver detach. Checks arguments, so you can feed
 * it the result from e.g. platform_get_resource() directly. Returns the
 * remapped pointer or NULL on error. Usage example:
 *
 *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 *      base = devm_request_and_ioremap(&pdev->dev, res);
 *      if (!base)
 *              return -EADDRNOTAVAIL;
 */
void __iomem *devm_request_and_ioremap(struct device *device,
                                       struct resource *res)
{
        void __iomem *dest_ptr;

        dest_ptr = devm_ioremap_resource(device, res);
        if (IS_ERR(dest_ptr))
                return NULL;

        return dest_ptr;
}
EXPORT_SYMBOL(devm_request_and_ioremap);

#ifdef CONFIG_HAS_IOPORT
/*
 * Generic iomap devres
 */
static void devm_ioport_map_release(struct device *dev, void *res)
{
        ioport_unmap(*(void __iomem **)res);
}

static int devm_ioport_map_match(struct device *dev, void *res,
                                 void *match_data)
{
        return *(void **)res == match_data;
}

/**
 * devm_ioport_map - Managed ioport_map()
 * @dev: Generic device to map ioport for
 * @port: Port to map
 * @nr: Number of ports to map
 *
 * Managed ioport_map().  Map is automatically unmapped on driver
 * detach.
 */
void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
                               unsigned int nr)
{
        void __iomem **ptr, *addr;

        ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
        if (!ptr)
                return NULL;

        addr = ioport_map(port, nr);
        if (addr) {
                *ptr = addr;
                devres_add(dev, ptr);
        } else
                devres_free(ptr);

        return addr;
}
EXPORT_SYMBOL(devm_ioport_map);

/**
 * devm_ioport_unmap - Managed ioport_unmap()
 * @dev: Generic device to unmap for
 * @addr: Address to unmap
 *
 * Managed ioport_unmap().  @addr must have been mapped using
 * devm_ioport_map().
 */
void devm_ioport_unmap(struct device *dev, void __iomem *addr)
{
        ioport_unmap(addr);
        WARN_ON(devres_destroy(dev, devm_ioport_map_release,
                               devm_ioport_map_match, (void *)addr));
}
EXPORT_SYMBOL(devm_ioport_unmap);
#endif /* CONFIG_HAS_IOPORT */

#ifdef CONFIG_PCI
/*
 * PCI iomap devres
 */
#define PCIM_IOMAP_MAX  PCI_ROM_RESOURCE

struct pcim_iomap_devres {
        void __iomem *table[PCIM_IOMAP_MAX];
};

static void pcim_iomap_release(struct device *gendev, void *res)
{
        struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
        struct pcim_iomap_devres *this = res;
        int i;

        for (i = 0; i < PCIM_IOMAP_MAX; i++)
                if (this->table[i])
                        pci_iounmap(dev, this->table[i]);
}

/**
 * pcim_iomap_table - access iomap allocation table
 * @pdev: PCI device to access iomap table for
 *
 * Access iomap allocation table for @dev.  If iomap table doesn't
 * exist and @pdev is managed, it will be allocated.  All iomaps
 * recorded in the iomap table are automatically unmapped on driver
 * detach.
 *
 * This function might sleep when the table is first allocated but can
 * be safely called without context and guaranteed to succed once
 * allocated.
 */
void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
{
        struct pcim_iomap_devres *dr, *new_dr;

        dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
        if (dr)
                return dr->table;

        new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
        if (!new_dr)
                return NULL;
        dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
        return dr->table;
}
EXPORT_SYMBOL(pcim_iomap_table);

/**
 * pcim_iomap - Managed pcim_iomap()
 * @pdev: PCI device to iomap for
 * @bar: BAR to iomap
 * @maxlen: Maximum length of iomap
 *
 * Managed pci_iomap().  Map is automatically unmapped on driver
 * detach.
 */
void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
{
        void __iomem **tbl;

        BUG_ON(bar >= PCIM_IOMAP_MAX);

        tbl = (void __iomem **)pcim_iomap_table(pdev);
        if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
                return NULL;

        tbl[bar] = pci_iomap(pdev, bar, maxlen);
        return tbl[bar];
}
EXPORT_SYMBOL(pcim_iomap);

/**
 * pcim_iounmap - Managed pci_iounmap()
 * @pdev: PCI device to iounmap for
 * @addr: Address to unmap
 *
 * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 */
void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
{
        void __iomem **tbl;
        int i;

        pci_iounmap(pdev, addr);

        tbl = (void __iomem **)pcim_iomap_table(pdev);
        BUG_ON(!tbl);

        for (i = 0; i < PCIM_IOMAP_MAX; i++)
                if (tbl[i] == addr) {
                        tbl[i] = NULL;
                        return;
                }
        WARN_ON(1);
}
EXPORT_SYMBOL(pcim_iounmap);

/**
 * pcim_iomap_regions - Request and iomap PCI BARs
 * @pdev: PCI device to map IO resources for
 * @mask: Mask of BARs to request and iomap
 * @name: Name used when requesting regions
 *
 * Request and iomap regions specified by @mask.
 */
int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
{
        void __iomem * const *iomap;
        int i, rc;

        iomap = pcim_iomap_table(pdev);
        if (!iomap)
                return -ENOMEM;

        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
                unsigned long len;

                if (!(mask & (1 << i)))
                        continue;

                rc = -EINVAL;
                len = pci_resource_len(pdev, i);
                if (!len)
                        goto err_inval;

                rc = pci_request_region(pdev, i, name);
                if (rc)
                        goto err_inval;

                rc = -ENOMEM;
                if (!pcim_iomap(pdev, i, 0))
                        goto err_region;
        }

        return 0;

 err_region:
        pci_release_region(pdev, i);
 err_inval:
        while (--i >= 0) {
                if (!(mask & (1 << i)))
                        continue;
                pcim_iounmap(pdev, iomap[i]);
                pci_release_region(pdev, i);
        }

        return rc;
}
EXPORT_SYMBOL(pcim_iomap_regions);

/**
 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 * @pdev: PCI device to map IO resources for
 * @mask: Mask of BARs to iomap
 * @name: Name used when requesting regions
 *
 * Request all PCI BARs and iomap regions specified by @mask.
 */
int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
                                   const char *name)
{
        int request_mask = ((1 << 6) - 1) & ~mask;
        int rc;

        rc = pci_request_selected_regions(pdev, request_mask, name);
        if (rc)
                return rc;

        rc = pcim_iomap_regions(pdev, mask, name);
        if (rc)
                pci_release_selected_regions(pdev, request_mask);
        return rc;
}
EXPORT_SYMBOL(pcim_iomap_regions_request_all);

/**
 * pcim_iounmap_regions - Unmap and release PCI BARs
 * @pdev: PCI device to map IO resources for
 * @mask: Mask of BARs to unmap and release
 *
 * Unmap and release regions specified by @mask.
 */
void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
{
        void __iomem * const *iomap;
        int i;

        iomap = pcim_iomap_table(pdev);
        if (!iomap)
                return;

        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
                if (!(mask & (1 << i)))
                        continue;

                pcim_iounmap(pdev, iomap[i]);
                pci_release_region(pdev, i);
        }
}
EXPORT_SYMBOL(pcim_iounmap_regions);
#endif /* CONFIG_PCI */