diff options
Diffstat (limited to '')
-rw-r--r-- | arch/powerpc/mm/ioremap_64.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/powerpc/mm/ioremap_64.c b/arch/powerpc/mm/ioremap_64.c new file mode 100644 index 0000000000..d24e5f1667 --- /dev/null +++ b/arch/powerpc/mm/ioremap_64.c @@ -0,0 +1,57 @@ +// 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); |