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// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
void __iomem *__ioremap_caller(phys_addr_t addr, unsigned long size,
pgprot_t prot, void *caller)
{
phys_addr_t paligned, offset;
void __iomem *ret;
int err;
/* We don't support the 4K PFN hack with ioremap */
if (pgprot_val(prot) & H_PAGE_4K_PFN)
return NULL;
/*
* Choose an address to map it to. Once the vmalloc system is running,
* we use it. Before that, we map using addresses going up from
* ioremap_bot. vmalloc will use the addresses from IOREMAP_BASE
* through ioremap_bot.
*/
paligned = addr & PAGE_MASK;
offset = addr & ~PAGE_MASK;
size = PAGE_ALIGN(addr + size) - paligned;
if (size == 0 || paligned == 0)
return NULL;
if (slab_is_available())
return generic_ioremap_prot(addr, size, prot);
pr_warn("ioremap() called early from %pS. Use early_ioremap() instead\n", caller);
err = early_ioremap_range(ioremap_bot, paligned, size, prot);
if (err)
return NULL;
ret = (void __iomem *)ioremap_bot + offset;
ioremap_bot += size + PAGE_SIZE;
return ret;
}
/*
* Unmap an IO region and remove it from vmalloc'd list.
* Access to IO memory should be serialized by driver.
*/
void iounmap(volatile void __iomem *token)
{
if (!slab_is_available())
return;
generic_iounmap(PCI_FIX_ADDR(token));
}
EXPORT_SYMBOL(iounmap);
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