1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_IO_H
3 #define _ASM_IO_H
4
5 #include <linux/types.h>
6 #include <asm/pgtable.h>
7
8 #define virt_to_phys(a) ((unsigned long)__pa(a))
9 #define phys_to_virt(a) __va(a)
10 #define virt_to_bus virt_to_phys
11 #define bus_to_virt phys_to_virt
12
isa_bus_to_virt(unsigned long addr)13 static inline unsigned long isa_bus_to_virt(unsigned long addr) {
14 BUG();
15 return 0;
16 }
17
isa_virt_to_bus(void * addr)18 static inline unsigned long isa_virt_to_bus(void *addr) {
19 BUG();
20 return 0;
21 }
22
23 /*
24 * Memory mapped I/O
25 *
26 * readX()/writeX() do byteswapping and take an ioremapped address
27 * __raw_readX()/__raw_writeX() don't byteswap and take an ioremapped address.
28 * gsc_*() don't byteswap and operate on physical addresses;
29 * eg dev->hpa or 0xfee00000.
30 */
31
gsc_readb(unsigned long addr)32 static inline unsigned char gsc_readb(unsigned long addr)
33 {
34 long flags;
35 unsigned char ret;
36
37 __asm__ __volatile__(
38 " rsm %3,%0\n"
39 " ldbx 0(%2),%1\n"
40 " mtsm %0\n"
41 : "=&r" (flags), "=r" (ret) : "r" (addr), "i" (PSW_SM_D) );
42
43 return ret;
44 }
45
gsc_readw(unsigned long addr)46 static inline unsigned short gsc_readw(unsigned long addr)
47 {
48 long flags;
49 unsigned short ret;
50
51 __asm__ __volatile__(
52 " rsm %3,%0\n"
53 " ldhx 0(%2),%1\n"
54 " mtsm %0\n"
55 : "=&r" (flags), "=r" (ret) : "r" (addr), "i" (PSW_SM_D) );
56
57 return ret;
58 }
59
gsc_readl(unsigned long addr)60 static inline unsigned int gsc_readl(unsigned long addr)
61 {
62 u32 ret;
63
64 __asm__ __volatile__(
65 " ldwax 0(%1),%0\n"
66 : "=r" (ret) : "r" (addr) );
67
68 return ret;
69 }
70
gsc_readq(unsigned long addr)71 static inline unsigned long long gsc_readq(unsigned long addr)
72 {
73 unsigned long long ret;
74
75 #ifdef CONFIG_64BIT
76 __asm__ __volatile__(
77 " ldda 0(%1),%0\n"
78 : "=r" (ret) : "r" (addr) );
79 #else
80 /* two reads may have side effects.. */
81 ret = ((u64) gsc_readl(addr)) << 32;
82 ret |= gsc_readl(addr+4);
83 #endif
84 return ret;
85 }
86
gsc_writeb(unsigned char val,unsigned long addr)87 static inline void gsc_writeb(unsigned char val, unsigned long addr)
88 {
89 long flags;
90 __asm__ __volatile__(
91 " rsm %3,%0\n"
92 " stbs %1,0(%2)\n"
93 " mtsm %0\n"
94 : "=&r" (flags) : "r" (val), "r" (addr), "i" (PSW_SM_D) );
95 }
96
gsc_writew(unsigned short val,unsigned long addr)97 static inline void gsc_writew(unsigned short val, unsigned long addr)
98 {
99 long flags;
100 __asm__ __volatile__(
101 " rsm %3,%0\n"
102 " sths %1,0(%2)\n"
103 " mtsm %0\n"
104 : "=&r" (flags) : "r" (val), "r" (addr), "i" (PSW_SM_D) );
105 }
106
gsc_writel(unsigned int val,unsigned long addr)107 static inline void gsc_writel(unsigned int val, unsigned long addr)
108 {
109 __asm__ __volatile__(
110 " stwas %0,0(%1)\n"
111 : : "r" (val), "r" (addr) );
112 }
113
gsc_writeq(unsigned long long val,unsigned long addr)114 static inline void gsc_writeq(unsigned long long val, unsigned long addr)
115 {
116 #ifdef CONFIG_64BIT
117 __asm__ __volatile__(
118 " stda %0,0(%1)\n"
119 : : "r" (val), "r" (addr) );
120 #else
121 /* two writes may have side effects.. */
122 gsc_writel(val >> 32, addr);
123 gsc_writel(val, addr+4);
124 #endif
125 }
126
127 /*
128 * The standard PCI ioremap interfaces
129 */
130
131 extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
132
133 /* Most machines react poorly to I/O-space being cacheable... Instead let's
134 * define ioremap() in terms of ioremap_nocache().
135 */
ioremap(unsigned long offset,unsigned long size)136 static inline void __iomem * ioremap(unsigned long offset, unsigned long size)
137 {
138 return __ioremap(offset, size, _PAGE_NO_CACHE);
139 }
140 #define ioremap_nocache(off, sz) ioremap((off), (sz))
141 #define ioremap_wc ioremap_nocache
142 #define ioremap_uc ioremap_nocache
143
144 extern void iounmap(const volatile void __iomem *addr);
145
__raw_readb(const volatile void __iomem * addr)146 static inline unsigned char __raw_readb(const volatile void __iomem *addr)
147 {
148 return (*(volatile unsigned char __force *) (addr));
149 }
__raw_readw(const volatile void __iomem * addr)150 static inline unsigned short __raw_readw(const volatile void __iomem *addr)
151 {
152 return *(volatile unsigned short __force *) addr;
153 }
__raw_readl(const volatile void __iomem * addr)154 static inline unsigned int __raw_readl(const volatile void __iomem *addr)
155 {
156 return *(volatile unsigned int __force *) addr;
157 }
__raw_readq(const volatile void __iomem * addr)158 static inline unsigned long long __raw_readq(const volatile void __iomem *addr)
159 {
160 return *(volatile unsigned long long __force *) addr;
161 }
162
__raw_writeb(unsigned char b,volatile void __iomem * addr)163 static inline void __raw_writeb(unsigned char b, volatile void __iomem *addr)
164 {
165 *(volatile unsigned char __force *) addr = b;
166 }
__raw_writew(unsigned short b,volatile void __iomem * addr)167 static inline void __raw_writew(unsigned short b, volatile void __iomem *addr)
168 {
169 *(volatile unsigned short __force *) addr = b;
170 }
__raw_writel(unsigned int b,volatile void __iomem * addr)171 static inline void __raw_writel(unsigned int b, volatile void __iomem *addr)
172 {
173 *(volatile unsigned int __force *) addr = b;
174 }
__raw_writeq(unsigned long long b,volatile void __iomem * addr)175 static inline void __raw_writeq(unsigned long long b, volatile void __iomem *addr)
176 {
177 *(volatile unsigned long long __force *) addr = b;
178 }
179
readb(const volatile void __iomem * addr)180 static inline unsigned char readb(const volatile void __iomem *addr)
181 {
182 return __raw_readb(addr);
183 }
readw(const volatile void __iomem * addr)184 static inline unsigned short readw(const volatile void __iomem *addr)
185 {
186 return le16_to_cpu((__le16 __force) __raw_readw(addr));
187 }
readl(const volatile void __iomem * addr)188 static inline unsigned int readl(const volatile void __iomem *addr)
189 {
190 return le32_to_cpu((__le32 __force) __raw_readl(addr));
191 }
readq(const volatile void __iomem * addr)192 static inline unsigned long long readq(const volatile void __iomem *addr)
193 {
194 return le64_to_cpu((__le64 __force) __raw_readq(addr));
195 }
196
writeb(unsigned char b,volatile void __iomem * addr)197 static inline void writeb(unsigned char b, volatile void __iomem *addr)
198 {
199 __raw_writeb(b, addr);
200 }
writew(unsigned short w,volatile void __iomem * addr)201 static inline void writew(unsigned short w, volatile void __iomem *addr)
202 {
203 __raw_writew((__u16 __force) cpu_to_le16(w), addr);
204 }
writel(unsigned int l,volatile void __iomem * addr)205 static inline void writel(unsigned int l, volatile void __iomem *addr)
206 {
207 __raw_writel((__u32 __force) cpu_to_le32(l), addr);
208 }
writeq(unsigned long long q,volatile void __iomem * addr)209 static inline void writeq(unsigned long long q, volatile void __iomem *addr)
210 {
211 __raw_writeq((__u64 __force) cpu_to_le64(q), addr);
212 }
213
214 #define readb readb
215 #define readw readw
216 #define readl readl
217 #define readq readq
218 #define writeb writeb
219 #define writew writew
220 #define writel writel
221 #define writeq writeq
222
223 #define readb_relaxed(addr) readb(addr)
224 #define readw_relaxed(addr) readw(addr)
225 #define readl_relaxed(addr) readl(addr)
226 #define readq_relaxed(addr) readq(addr)
227 #define writeb_relaxed(b, addr) writeb(b, addr)
228 #define writew_relaxed(w, addr) writew(w, addr)
229 #define writel_relaxed(l, addr) writel(l, addr)
230 #define writeq_relaxed(q, addr) writeq(q, addr)
231
232 void memset_io(volatile void __iomem *addr, unsigned char val, int count);
233 void memcpy_fromio(void *dst, const volatile void __iomem *src, int count);
234 void memcpy_toio(volatile void __iomem *dst, const void *src, int count);
235
236 /* Port-space IO */
237
238 #define inb_p inb
239 #define inw_p inw
240 #define inl_p inl
241 #define outb_p outb
242 #define outw_p outw
243 #define outl_p outl
244
245 extern unsigned char eisa_in8(unsigned short port);
246 extern unsigned short eisa_in16(unsigned short port);
247 extern unsigned int eisa_in32(unsigned short port);
248 extern void eisa_out8(unsigned char data, unsigned short port);
249 extern void eisa_out16(unsigned short data, unsigned short port);
250 extern void eisa_out32(unsigned int data, unsigned short port);
251
252 #if defined(CONFIG_PCI)
253 extern unsigned char inb(int addr);
254 extern unsigned short inw(int addr);
255 extern unsigned int inl(int addr);
256
257 extern void outb(unsigned char b, int addr);
258 extern void outw(unsigned short b, int addr);
259 extern void outl(unsigned int b, int addr);
260 #elif defined(CONFIG_EISA)
261 #define inb eisa_in8
262 #define inw eisa_in16
263 #define inl eisa_in32
264 #define outb eisa_out8
265 #define outw eisa_out16
266 #define outl eisa_out32
267 #else
inb(unsigned long addr)268 static inline char inb(unsigned long addr)
269 {
270 BUG();
271 return -1;
272 }
273
inw(unsigned long addr)274 static inline short inw(unsigned long addr)
275 {
276 BUG();
277 return -1;
278 }
279
inl(unsigned long addr)280 static inline int inl(unsigned long addr)
281 {
282 BUG();
283 return -1;
284 }
285
286 #define outb(x, y) BUG()
287 #define outw(x, y) BUG()
288 #define outl(x, y) BUG()
289 #endif
290
291 /*
292 * String versions of in/out ops:
293 */
294 extern void insb (unsigned long port, void *dst, unsigned long count);
295 extern void insw (unsigned long port, void *dst, unsigned long count);
296 extern void insl (unsigned long port, void *dst, unsigned long count);
297 extern void outsb (unsigned long port, const void *src, unsigned long count);
298 extern void outsw (unsigned long port, const void *src, unsigned long count);
299 extern void outsl (unsigned long port, const void *src, unsigned long count);
300
301
302 /* IO Port space is : BBiiii where BB is HBA number. */
303 #define IO_SPACE_LIMIT 0x00ffffff
304
305 /* PA machines have an MM I/O space from 0xf0000000-0xffffffff in 32
306 * bit mode and from 0xfffffffff0000000-0xfffffffffffffff in 64 bit
307 * mode (essentially just sign extending. This macro takes in a 32
308 * bit I/O address (still with the leading f) and outputs the correct
309 * value for either 32 or 64 bit mode */
310 #define F_EXTEND(x) ((unsigned long)((x) | (0xffffffff00000000ULL)))
311
312 #define ioread64 ioread64
313 #define ioread64be ioread64be
314 #define iowrite64 iowrite64
315 #define iowrite64be iowrite64be
316 extern u64 ioread64(void __iomem *addr);
317 extern u64 ioread64be(void __iomem *addr);
318 extern void iowrite64(u64 val, void __iomem *addr);
319 extern void iowrite64be(u64 val, void __iomem *addr);
320
321 #include <asm-generic/iomap.h>
322
323 /*
324 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
325 * access
326 */
327 #define xlate_dev_mem_ptr(p) __va(p)
328
329 /*
330 * Convert a virtual cached pointer to an uncached pointer
331 */
332 #define xlate_dev_kmem_ptr(p) p
333
334 #endif
335
