projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 96cf5185 G |
2 | /* |
| 3 | * linux/arch/unicore32/include/asm/io.h | |
| 4 | * | |
| 5 | * Code specific to PKUnity SoC and UniCore ISA | |
| 6 | * | |
| 7 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
| 96cf5185 G |
8 | */ |
| 9 | #ifndef __UNICORE_IO_H__ | |
| 10 | #define __UNICORE_IO_H__ | |
| 11 | ||
| 12 | #ifdef __KERNEL__ | |
| 13 | ||
| 14 | #include <asm/byteorder.h> | |
| 15 | #include <asm/memory.h> | |
| 96cf5185 | 16 | |
| 1cf46c42 | 17 | #define PCI_IOBASE PKUNITY_PCILIO_BASE |
| 96cf5185 G |
18 | #include <asm-generic/io.h> |
| 19 | ||
| 20 | /* | |
| 21 | * __uc32_ioremap and __uc32_ioremap_cached takes CPU physical address. | |
| 22 | */ | |
| 23 | extern void __iomem *__uc32_ioremap(unsigned long, size_t); | |
| 24 | extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t); | |
| 25 | extern void __uc32_iounmap(volatile void __iomem *addr); | |
| 26 | ||
| 27 | /* | |
| 28 | * ioremap and friends. | |
| 29 | * | |
| 30 | * ioremap takes a PCI memory address, as specified in | |
| 395cf969 | 31 | * Documentation/io-mapping.txt. |
| 96cf5185 G |
32 | * |
| 33 | */ | |
| 34 | #define ioremap(cookie, size) __uc32_ioremap(cookie, size) | |
| 35 | #define ioremap_cached(cookie, size) __uc32_ioremap_cached(cookie, size) | |
| a50e4213 | 36 | #define ioremap_nocache(cookie, size) __uc32_ioremap(cookie, size) |
| 96cf5185 G |
37 | #define iounmap(cookie) __uc32_iounmap(cookie) |
| 38 | ||
| 312c6df4 CG |
39 | #define readb_relaxed readb |
| 40 | #define readw_relaxed readw | |
| 41 | #define readl_relaxed readl | |
| 42 | ||
| 4fde87cb G |
43 | #define HAVE_ARCH_PIO_SIZE |
| 44 | #define PIO_OFFSET (unsigned int)(PCI_IOBASE) | |
| 45 | #define PIO_MASK (unsigned int)(IO_SPACE_LIMIT) | |
| 46 | #define PIO_RESERVED (PIO_OFFSET + PIO_MASK + 1) | |
| 47 | ||
| 8a016596 CG |
48 | #ifdef CONFIG_STRICT_DEVMEM |
| 49 | ||
| 50 | #include <linux/ioport.h> | |
| 51 | #include <linux/mm.h> | |
| 52 | ||
| 53 | /* | |
| 54 | * devmem_is_allowed() checks to see if /dev/mem access to a certain | |
| 55 | * address is valid. The argument is a physical page number. | |
| 56 | * We mimic x86 here by disallowing access to system RAM as well as | |
| 57 | * device-exclusive MMIO regions. This effectively disable read()/write() | |
| 58 | * on /dev/mem. | |
| 59 | */ | |
| 60 | static inline int devmem_is_allowed(unsigned long pfn) | |
| 61 | { | |
| 62 | if (iomem_is_exclusive(pfn << PAGE_SHIFT)) | |
| 63 | return 0; | |
| 64 | if (!page_is_ram(pfn)) | |
| 65 | return 1; | |
| 66 | return 0; | |
| 67 | } | |
| 68 | ||
| 69 | #endif /* CONFIG_STRICT_DEVMEM */ | |
| 70 | ||
| 96cf5185 G |
71 | #endif /* __KERNEL__ */ |
| 72 | #endif /* __UNICORE_IO_H__ */ |