1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _M68KNOMMU_IO_H 3 #define _M68KNOMMU_IO_H 4 5 #ifdef __KERNEL__ 6 7 #define ARCH_HAS_IOREMAP_WT 8 9 #include <asm/virtconvert.h> 10 #include <asm-generic/iomap.h> 11 12 /* 13 * These are for ISA/PCI shared memory _only_ and should never be used 14 * on any other type of memory, including Zorro memory. They are meant to 15 * access the bus in the bus byte order which is little-endian!. 16 * 17 * readX/writeX() are used to access memory mapped devices. On some 18 * architectures the memory mapped IO stuff needs to be accessed 19 * differently. On the m68k architecture, we just read/write the 20 * memory location directly. 21 */ 22 /* ++roman: The assignments to temp. vars avoid that gcc sometimes generates 23 * two accesses to memory, which may be undesirable for some devices. 24 */ 25 26 /* 27 * swap functions are sometimes needed to interface little-endian hardware 28 */ 29 static inline unsigned short _swapw(volatile unsigned short v) 30 { 31 return ((v << 8) | (v >> 8)); 32 } 33 34 static inline unsigned int _swapl(volatile unsigned long v) 35 { 36 return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24)); 37 } 38 39 #define readb(addr) \ 40 ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; }) 41 #define readw(addr) \ 42 ({ unsigned short __v = (*(volatile unsigned short *) (addr)); __v; }) 43 #define readl(addr) \ 44 ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; }) 45 46 #define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b)) 47 #define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b)) 48 #define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b)) 49 50 #define __raw_readb readb 51 #define __raw_readw readw 52 #define __raw_readl readl 53 #define __raw_writeb writeb 54 #define __raw_writew writew 55 #define __raw_writel writel 56 57 static inline void io_outsb(unsigned int addr, const void *buf, int len) 58 { 59 volatile unsigned char *ap = (volatile unsigned char *) addr; 60 unsigned char *bp = (unsigned char *) buf; 61 while (len--) 62 *ap = *bp++; 63 } 64 65 static inline void io_outsw(unsigned int addr, const void *buf, int len) 66 { 67 volatile unsigned short *ap = (volatile unsigned short *) addr; 68 unsigned short *bp = (unsigned short *) buf; 69 while (len--) 70 *ap = _swapw(*bp++); 71 } 72 73 static inline void io_outsl(unsigned int addr, const void *buf, int len) 74 { 75 volatile unsigned int *ap = (volatile unsigned int *) addr; 76 unsigned int *bp = (unsigned int *) buf; 77 while (len--) 78 *ap = _swapl(*bp++); 79 } 80 81 static inline void io_insb(unsigned int addr, void *buf, int len) 82 { 83 volatile unsigned char *ap = (volatile unsigned char *) addr; 84 unsigned char *bp = (unsigned char *) buf; 85 while (len--) 86 *bp++ = *ap; 87 } 88 89 static inline void io_insw(unsigned int addr, void *buf, int len) 90 { 91 volatile unsigned short *ap = (volatile unsigned short *) addr; 92 unsigned short *bp = (unsigned short *) buf; 93 while (len--) 94 *bp++ = _swapw(*ap); 95 } 96 97 static inline void io_insl(unsigned int addr, void *buf, int len) 98 { 99 volatile unsigned int *ap = (volatile unsigned int *) addr; 100 unsigned int *bp = (unsigned int *) buf; 101 while (len--) 102 *bp++ = _swapl(*ap); 103 } 104 105 #define mmiowb() 106 107 /* 108 * make the short names macros so specific devices 109 * can override them as required 110 */ 111 112 #define memset_io(a,b,c) memset((void *)(a),(b),(c)) 113 #define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c)) 114 #define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c)) 115 116 #define inb(addr) readb(addr) 117 #define inw(addr) readw(addr) 118 #define inl(addr) readl(addr) 119 #define outb(x,addr) ((void) writeb(x,addr)) 120 #define outw(x,addr) ((void) writew(x,addr)) 121 #define outl(x,addr) ((void) writel(x,addr)) 122 123 #define inb_p(addr) inb(addr) 124 #define inw_p(addr) inw(addr) 125 #define inl_p(addr) inl(addr) 126 #define outb_p(x,addr) outb(x,addr) 127 #define outw_p(x,addr) outw(x,addr) 128 #define outl_p(x,addr) outl(x,addr) 129 130 #define outsb(a,b,l) io_outsb(a,b,l) 131 #define outsw(a,b,l) io_outsw(a,b,l) 132 #define outsl(a,b,l) io_outsl(a,b,l) 133 134 #define insb(a,b,l) io_insb(a,b,l) 135 #define insw(a,b,l) io_insw(a,b,l) 136 #define insl(a,b,l) io_insl(a,b,l) 137 138 #define IO_SPACE_LIMIT 0xffffffff 139 140 141 /* Values for nocacheflag and cmode */ 142 #define IOMAP_FULL_CACHING 0 143 #define IOMAP_NOCACHE_SER 1 144 #define IOMAP_NOCACHE_NONSER 2 145 #define IOMAP_WRITETHROUGH 3 146 147 static inline void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag) 148 { 149 return (void *) physaddr; 150 } 151 static inline void *ioremap(unsigned long physaddr, unsigned long size) 152 { 153 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER); 154 } 155 static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size) 156 { 157 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER); 158 } 159 static inline void *ioremap_wt(unsigned long physaddr, unsigned long size) 160 { 161 return __ioremap(physaddr, size, IOMAP_WRITETHROUGH); 162 } 163 static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size) 164 { 165 return __ioremap(physaddr, size, IOMAP_FULL_CACHING); 166 } 167 168 #define iounmap(addr) do { } while(0) 169 170 /* 171 * Convert a physical pointer to a virtual kernel pointer for /dev/mem 172 * access 173 */ 174 #define xlate_dev_mem_ptr(p) __va(p) 175 176 /* 177 * Convert a virtual cached pointer to an uncached pointer 178 */ 179 #define xlate_dev_kmem_ptr(p) p 180 181 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr) 182 { 183 return (void __iomem *) port; 184 } 185 186 static inline void ioport_unmap(void __iomem *p) 187 { 188 } 189 190 #endif /* __KERNEL__ */ 191 192 #endif /* _M68KNOMMU_IO_H */ 193