io.h

  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 <linux/pgtable.h>
  7
  8#define virt_to_phys(a) ((unsigned long)__pa(a))
  9#define phys_to_virt(a) __va(a)
 10
 11static inline unsigned long isa_bus_to_virt(unsigned long addr) {
 12	BUG();
 13	return 0;
 14}
 15
 16static inline unsigned long isa_virt_to_bus(void *addr) {
 17	BUG();
 18	return 0;
 19}
 20
 21/*
 22 * Memory mapped I/O
 23 *
 24 * readX()/writeX() do byteswapping and take an ioremapped address
 25 * __raw_readX()/__raw_writeX() don't byteswap and take an ioremapped address.
 26 * gsc_*() don't byteswap and operate on physical addresses;
 27 *   eg dev->hpa or 0xfee00000.
 28 */
 29
 30static inline unsigned char gsc_readb(unsigned long addr)
 31{
 32	long flags;
 33	unsigned char ret;
 34
 35	__asm__ __volatile__(
 36	"	rsm	%3,%0\n"
 37	"	ldbx	0(%2),%1\n"
 38	"	mtsm	%0\n"
 39	: "=&r" (flags), "=r" (ret) : "r" (addr), "i" (PSW_SM_D) );
 40
 41	return ret;
 42}
 43
 44static inline unsigned short gsc_readw(unsigned long addr)
 45{
 46	long flags;
 47	unsigned short ret;
 48
 49	__asm__ __volatile__(
 50	"	rsm	%3,%0\n"
 51	"	ldhx	0(%2),%1\n"
 52	"	mtsm	%0\n"
 53	: "=&r" (flags), "=r" (ret) : "r" (addr), "i" (PSW_SM_D) );
 54
 55	return ret;
 56}
 57
 58static inline unsigned int gsc_readl(unsigned long addr)
 59{
 60	u32 ret;
 61
 62	__asm__ __volatile__(
 63	"	ldwax	0(%1),%0\n"
 64	: "=r" (ret) : "r" (addr) );
 65
 66	return ret;
 67}
 68
 69static inline unsigned long long gsc_readq(unsigned long addr)
 70{
 71	unsigned long long ret;
 72
 73#ifdef CONFIG_64BIT
 74	__asm__ __volatile__(
 75	"	ldda	0(%1),%0\n"
 76	:  "=r" (ret) : "r" (addr) );
 77#else
 78	/* two reads may have side effects.. */
 79	ret = ((u64) gsc_readl(addr)) << 32;
 80	ret |= gsc_readl(addr+4);
 81#endif
 82	return ret;
 83}
 84
 85static inline void gsc_writeb(unsigned char val, unsigned long addr)
 86{
 87	long flags;
 88	__asm__ __volatile__(
 89	"	rsm	%3,%0\n"
 90	"	stbs	%1,0(%2)\n"
 91	"	mtsm	%0\n"
 92	: "=&r" (flags) :  "r" (val), "r" (addr), "i" (PSW_SM_D) );
 93}
 94
 95static inline void gsc_writew(unsigned short val, unsigned long addr)
 96{
 97	long flags;
 98	__asm__ __volatile__(
 99	"	rsm	%3,%0\n"
100	"	sths	%1,0(%2)\n"
101	"	mtsm	%0\n"
102	: "=&r" (flags) :  "r" (val), "r" (addr), "i" (PSW_SM_D) );
103}
104
105static inline void gsc_writel(unsigned int val, unsigned long addr)
106{
107	__asm__ __volatile__(
108	"	stwas	%0,0(%1)\n"
109	: :  "r" (val), "r" (addr) );
110}
111
112static inline void gsc_writeq(unsigned long long val, unsigned long addr)
113{
114#ifdef CONFIG_64BIT
115	__asm__ __volatile__(
116	"	stda	%0,0(%1)\n"
117	: :  "r" (val), "r" (addr) );
118#else
119	/* two writes may have side effects.. */
120	gsc_writel(val >> 32, addr);
121	gsc_writel(val, addr+4);
122#endif
123}
124
125/*
126 * The standard PCI ioremap interfaces
127 */
128#define ioremap_prot ioremap_prot
129
130#define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
131		       _PAGE_ACCESSED | _PAGE_NO_CACHE)
132
133#define ioremap_wc(addr, size)  \
134	ioremap_prot((addr), (size), __pgprot(_PAGE_IOREMAP))
135
136#define pci_iounmap			pci_iounmap
137
138/* Port-space IO */
139
140#define inb_p inb
141#define inw_p inw
142#define inl_p inl
143#define outb_p outb
144#define outw_p outw
145#define outl_p outl
146
147extern unsigned char eisa_in8(unsigned short port);
148extern unsigned short eisa_in16(unsigned short port);
149extern unsigned int eisa_in32(unsigned short port);
150extern void eisa_out8(unsigned char data, unsigned short port);
151extern void eisa_out16(unsigned short data, unsigned short port);
152extern void eisa_out32(unsigned int data, unsigned short port);
153
154#if defined(CONFIG_PCI)
155extern unsigned char inb(int addr);
156extern unsigned short inw(int addr);
157extern unsigned int inl(int addr);
158extern void outb(unsigned char b, int addr);
159extern void outw(unsigned short b, int addr);
160extern void outl(unsigned int b, int addr);
161#define inb inb
162#define inw inw
163#define inl inl
164#define outb outb
165#define outw outw
166#define outl outl
167#elif defined(CONFIG_EISA)
168#define inb eisa_in8
169#define inw eisa_in16
170#define inl eisa_in32
171#define outb eisa_out8
172#define outw eisa_out16
173#define outl eisa_out32
174#else
175static inline char inb(unsigned long addr)
176{
177	BUG();
178	return -1;
179}
180
181static inline short inw(unsigned long addr)
182{
183	BUG();
184	return -1;
185}
186
187static inline int inl(unsigned long addr)
188{
189	BUG();
190	return -1;
191}
192#define inb inb
193#define inw inw
194#define inl inl
195#define outb(x, y)	({(void)(x); (void)(y); BUG(); 0;})
196#define outw(x, y)	({(void)(x); (void)(y); BUG(); 0;})
197#define outl(x, y)	({(void)(x); (void)(y); BUG(); 0;})
198#endif
199
200/*
201 * String versions of in/out ops:
202 */
203extern void insb (unsigned long port, void *dst, unsigned long count);
204extern void insw (unsigned long port, void *dst, unsigned long count);
205extern void insl (unsigned long port, void *dst, unsigned long count);
206extern void outsb (unsigned long port, const void *src, unsigned long count);
207extern void outsw (unsigned long port, const void *src, unsigned long count);
208extern void outsl (unsigned long port, const void *src, unsigned long count);
209#define insb insb
210#define insw insw
211#define insl insl
212#define outsb outsb
213#define outsw outsw
214#define outsl outsl
215
216/* IO Port space is :      BBiiii   where BB is HBA number. */
217#define IO_SPACE_LIMIT 0x00ffffff
218
219/* PA machines have an MM I/O space from 0xf0000000-0xffffffff in 32
220 * bit mode and from 0xfffffffff0000000-0xfffffffffffffff in 64 bit
221 * mode (essentially just sign extending.  This macro takes in a 32
222 * bit I/O address (still with the leading f) and outputs the correct
223 * value for either 32 or 64 bit mode */
224#define F_EXTEND(x) ((unsigned long)((x) | (0xffffffff00000000ULL)))
225
226#ifdef CONFIG_64BIT
227extern u64 ioread64(const void __iomem *addr);
228extern u64 ioread64be(const void __iomem *addr);
229#define ioread64 ioread64
230#define ioread64be ioread64be
231
232extern void iowrite64(u64 val, void __iomem *addr);
233extern void iowrite64be(u64 val, void __iomem *addr);
234#define iowrite64 iowrite64
235#define iowrite64be iowrite64be
236#endif
237
238extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
239extern void ioport_unmap(void __iomem *);
240#define ioport_map ioport_map
241#define ioport_unmap ioport_unmap
242
243extern unsigned int ioread8(const void __iomem *);
244extern unsigned int ioread16(const void __iomem *);
245extern unsigned int ioread16be(const void __iomem *);
246extern unsigned int ioread32(const void __iomem *);
247extern unsigned int ioread32be(const void __iomem *);
248#define ioread8 ioread8
249#define ioread16 ioread16
250#define ioread32 ioread32
251#define ioread16be ioread16be
252#define ioread32be ioread32be
253
254extern void iowrite8(u8, void __iomem *);
255extern void iowrite16(u16, void __iomem *);
256extern void iowrite16be(u16, void __iomem *);
257extern void iowrite32(u32, void __iomem *);
258extern void iowrite32be(u32, void __iomem *);
259#define iowrite8 iowrite8
260#define iowrite16 iowrite16
261#define iowrite32 iowrite32
262#define iowrite16be iowrite16be
263#define iowrite32be iowrite32be
264
265extern void ioread8_rep(const void __iomem *port, void *buf, unsigned long count);
266extern void ioread16_rep(const void __iomem *port, void *buf, unsigned long count);
267extern void ioread32_rep(const void __iomem *port, void *buf, unsigned long count);
268#define ioread8_rep ioread8_rep
269#define ioread16_rep ioread16_rep
270#define ioread32_rep ioread32_rep
271
272extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
273extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
274extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
275#define iowrite8_rep iowrite8_rep
276#define iowrite16_rep iowrite16_rep
277#define iowrite32_rep iowrite32_rep
278
279extern int devmem_is_allowed(unsigned long pfn);
280
281#include <asm-generic/io.h>
282
283#endif