1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 #include <linux/io.h> 4 #include <linux/slab.h> 5 #include <linux/vmalloc.h> 6 7 void __iomem *__ioremap_caller(phys_addr_t addr, unsigned long size, 8 pgprot_t prot, void *caller) 9 { 10 phys_addr_t paligned, offset; 11 void __iomem *ret; 12 int err; 13 14 /* We don't support the 4K PFN hack with ioremap */ 15 if (pgprot_val(prot) & H_PAGE_4K_PFN) 16 return NULL; 17 18 /* 19 * Choose an address to map it to. Once the vmalloc system is running, 20 * we use it. Before that, we map using addresses going up from 21 * ioremap_bot. vmalloc will use the addresses from IOREMAP_BASE 22 * through ioremap_bot. 23 */ 24 paligned = addr & PAGE_MASK; 25 offset = addr & ~PAGE_MASK; 26 size = PAGE_ALIGN(addr + size) - paligned; 27 28 if (size == 0 || paligned == 0) 29 return NULL; 30 31 if (slab_is_available()) 32 return do_ioremap(paligned, offset, size, prot, caller); 33 34 pr_warn("ioremap() called early from %pS. Use early_ioremap() instead\n", caller); 35 36 err = early_ioremap_range(ioremap_bot, paligned, size, prot); 37 if (err) 38 return NULL; 39 40 ret = (void __iomem *)ioremap_bot + offset; 41 ioremap_bot += size + PAGE_SIZE; 42 43 return ret; 44 } 45 46 /* 47 * Unmap an IO region and remove it from vmalloc'd list. 48 * Access to IO memory should be serialized by driver. 49 */ 50 void iounmap(volatile void __iomem *token) 51 { 52 void *addr; 53 54 if (!slab_is_available()) 55 return; 56 57 addr = (void *)((unsigned long __force)PCI_FIX_ADDR(token) & PAGE_MASK); 58 59 if ((unsigned long)addr < ioremap_bot) { 60 pr_warn("Attempt to iounmap early bolted mapping at 0x%p\n", addr); 61 return; 62 } 63 vunmap(addr); 64 } 65 EXPORT_SYMBOL(iounmap); 66