1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465 |
- // 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 do_ioremap(paligned, offset, size, prot, caller);
- 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)
- {
- void *addr;
- if (!slab_is_available())
- return;
- addr = (void *)((unsigned long __force)PCI_FIX_ADDR(token) & PAGE_MASK);
- if ((unsigned long)addr < ioremap_bot) {
- pr_warn("Attempt to iounmap early bolted mapping at 0x%p\n", addr);
- return;
- }
- vunmap(addr);
- }
- EXPORT_SYMBOL(iounmap);
|