[mirror_ubuntu-focal-kernel.git] / arch / s390 / include / asm / pci_io.h

#ifndef _ASM_S390_PCI_IO_H
#define _ASM_S390_PCI_IO_H

#ifdef CONFIG_PCI

#include <linux/kernel.h>
#include <linux/slab.h>
#include <asm/pci_insn.h>

/* I/O Map */
#define ZPCI_IOMAP_SHIFT		48
#define ZPCI_IOMAP_ADDR_BASE		0x8000000000000000UL
#define ZPCI_IOMAP_ADDR_OFF_MASK	((1UL << ZPCI_IOMAP_SHIFT) - 1)
#define ZPCI_IOMAP_MAX_ENTRIES							\
	((ULONG_MAX - ZPCI_IOMAP_ADDR_BASE + 1) / (1UL << ZPCI_IOMAP_SHIFT))
#define ZPCI_IOMAP_ADDR_IDX_MASK						\
	(~ZPCI_IOMAP_ADDR_OFF_MASK - ZPCI_IOMAP_ADDR_BASE)

struct zpci_iomap_entry {
	u32 fh;
	u8 bar;
	u16 count;
};

extern struct zpci_iomap_entry *zpci_iomap_start;

#define ZPCI_ADDR(idx) (ZPCI_IOMAP_ADDR_BASE | ((u64) idx << ZPCI_IOMAP_SHIFT))
#define ZPCI_IDX(addr)								\
	(((__force u64) addr & ZPCI_IOMAP_ADDR_IDX_MASK) >> ZPCI_IOMAP_SHIFT)
#define ZPCI_OFFSET(addr)							\
	((__force u64) addr & ZPCI_IOMAP_ADDR_OFF_MASK)

#define ZPCI_CREATE_REQ(handle, space, len)					\
	((u64) handle << 32 | space << 16 | len)

#define zpci_read(LENGTH, RETTYPE)						\
static inline RETTYPE zpci_read_##RETTYPE(const volatile void __iomem *addr)	\
{										\
	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];	\
	u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH);		\
	u64 data;								\
	int rc;									\
										\
	rc = zpci_load(&data, req, ZPCI_OFFSET(addr));				\
	if (rc)									\
		data = -1ULL;							\
	return (RETTYPE) data;							\
}

#define zpci_write(LENGTH, VALTYPE)						\
static inline void zpci_write_##VALTYPE(VALTYPE val,				\
					const volatile void __iomem *addr)	\
{										\
	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];	\
	u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH);		\
	u64 data = (VALTYPE) val;						\
										\
	zpci_store(data, req, ZPCI_OFFSET(addr));				\
}

zpci_read(8, u64)
zpci_read(4, u32)
zpci_read(2, u16)
zpci_read(1, u8)
zpci_write(8, u64)
zpci_write(4, u32)
zpci_write(2, u16)
zpci_write(1, u8)

static inline int zpci_write_single(u64 req, const u64 *data, u64 offset, u8 len)
{
	u64 val;

	switch (len) {
	case 1:
		val = (u64) *((u8 *) data);
		break;
	case 2:
		val = (u64) *((u16 *) data);
		break;
	case 4:
		val = (u64) *((u32 *) data);
		break;
	case 8:
		val = (u64) *((u64 *) data);
		break;
	default:
		val = 0;		/* let FW report error */
		break;
	}
	return zpci_store(val, req, offset);
}

static inline int zpci_read_single(u64 req, u64 *dst, u64 offset, u8 len)
{
	u64 data;
	int cc;

	cc = zpci_load(&data, req, offset);
	if (cc)
		goto out;

	switch (len) {
	case 1:
		*((u8 *) dst) = (u8) data;
		break;
	case 2:
		*((u16 *) dst) = (u16) data;
		break;
	case 4:
		*((u32 *) dst) = (u32) data;
		break;
	case 8:
		*((u64 *) dst) = (u64) data;
		break;
	}
out:
	return cc;
}

static inline int zpci_write_block(u64 req, const u64 *data, u64 offset)
{
	return zpci_store_block(data, req, offset);
}

static inline u8 zpci_get_max_write_size(u64 src, u64 dst, int len, int max)
{
	int count = len > max ? max : len, size = 1;

	while (!(src & 0x1) && !(dst & 0x1) && ((size << 1) <= count)) {
		dst = dst >> 1;
		src = src >> 1;
		size = size << 1;
	}
	return size;
}

static inline int zpci_memcpy_fromio(void *dst,
				     const volatile void __iomem *src,
				     unsigned long n)
{
	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(src)];
	u64 req, offset = ZPCI_OFFSET(src);
	int size, rc = 0;

	while (n > 0) {
		size = zpci_get_max_write_size((u64 __force) src,
					       (u64) dst, n, 8);
		req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
		rc = zpci_read_single(req, dst, offset, size);
		if (rc)
			break;
		offset += size;
		dst += size;
		n -= size;
	}
	return rc;
}

static inline int zpci_memcpy_toio(volatile void __iomem *dst,
				   const void *src, unsigned long n)
{
	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(dst)];
	u64 req, offset = ZPCI_OFFSET(dst);
	int size, rc = 0;

	if (!src)
		return -EINVAL;

	while (n > 0) {
		size = zpci_get_max_write_size((u64 __force) dst,
					       (u64) src, n, 128);
		req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);

		if (size > 8) /* main path */
			rc = zpci_write_block(req, src, offset);
		else
			rc = zpci_write_single(req, src, offset, size);
		if (rc)
			break;
		offset += size;
		src += size;
		n -= size;
	}
	return rc;
}

static inline int zpci_memset_io(volatile void __iomem *dst,
				 unsigned char val, size_t count)
{
	u8 *src = kmalloc(count, GFP_KERNEL);
	int rc;

	if (src == NULL)
		return -ENOMEM;
	memset(src, val, count);

	rc = zpci_memcpy_toio(dst, src, count);
	kfree(src);
	return rc;
}

#endif /* CONFIG_PCI */

#endif /* _ASM_S390_PCI_IO_H */
Commit	Line	Data
cd248341 JG	1	#ifndef _ASM_S390_PCI_IO_H
	2	#define _ASM_S390_PCI_IO_H
	3
	4	#ifdef CONFIG_PCI
	5
	6	#include <linux/kernel.h>
	7	#include <linux/slab.h>
	8	#include <asm/pci_insn.h>
	9
	10	/* I/O Map */
bf19c94d SO	11	#define ZPCI_IOMAP_SHIFT 48
	12	#define ZPCI_IOMAP_ADDR_BASE 0x8000000000000000UL
	13	#define ZPCI_IOMAP_ADDR_OFF_MASK ((1UL << ZPCI_IOMAP_SHIFT) - 1)
	14	#define ZPCI_IOMAP_MAX_ENTRIES \
	15	((ULONG_MAX - ZPCI_IOMAP_ADDR_BASE + 1) / (1UL << ZPCI_IOMAP_SHIFT))
	16	#define ZPCI_IOMAP_ADDR_IDX_MASK \
	17	(~ZPCI_IOMAP_ADDR_OFF_MASK - ZPCI_IOMAP_ADDR_BASE)
cd248341 JG	18
	19	struct zpci_iomap_entry {
	20	u32 fh;
	21	u8 bar;
8cfc99b5	22	u16 count;
cd248341 JG	23	};
	24
	25	extern struct zpci_iomap_entry *zpci_iomap_start;
	26
bf19c94d	27	#define ZPCI_ADDR(idx) (ZPCI_IOMAP_ADDR_BASE \| ((u64) idx << ZPCI_IOMAP_SHIFT))
cd248341	28	#define ZPCI_IDX(addr) \
bf19c94d	29	(((__force u64) addr & ZPCI_IOMAP_ADDR_IDX_MASK) >> ZPCI_IOMAP_SHIFT)
cd248341 JG	30	#define ZPCI_OFFSET(addr) \
	31	((__force u64) addr & ZPCI_IOMAP_ADDR_OFF_MASK)
	32
	33	#define ZPCI_CREATE_REQ(handle, space, len) \
	34	((u64) handle << 32 \| space << 16 \| len)
	35
	36	#define zpci_read(LENGTH, RETTYPE) \
	37	static inline RETTYPE zpci_read_##RETTYPE(const volatile void __iomem *addr) \
	38	{ \
	39	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)]; \
	40	u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH); \
	41	u64 data; \
	42	int rc; \
	43	\
9389339f	44	rc = zpci_load(&data, req, ZPCI_OFFSET(addr)); \
cd248341 JG	45	if (rc) \
	46	data = -1ULL; \
	47	return (RETTYPE) data; \
	48	}
	49
	50	#define zpci_write(LENGTH, VALTYPE) \
	51	static inline void zpci_write_##VALTYPE(VALTYPE val, \
	52	const volatile void __iomem *addr) \
	53	{ \
	54	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)]; \
	55	u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH); \
	56	u64 data = (VALTYPE) val; \
	57	\
9389339f	58	zpci_store(data, req, ZPCI_OFFSET(addr)); \
cd248341 JG	59	}
	60
	61	zpci_read(8, u64)
	62	zpci_read(4, u32)
	63	zpci_read(2, u16)
	64	zpci_read(1, u8)
	65	zpci_write(8, u64)
	66	zpci_write(4, u32)
	67	zpci_write(2, u16)
	68	zpci_write(1, u8)
	69
	70	static inline int zpci_write_single(u64 req, const u64 *data, u64 offset, u8 len)
	71	{
	72	u64 val;
	73
	74	switch (len) {
	75	case 1:
	76	val = (u64) ((u8 ) data);
	77	break;
	78	case 2:
	79	val = (u64) ((u16 ) data);
	80	break;
	81	case 4:
	82	val = (u64) ((u32 ) data);
	83	break;
	84	case 8:
	85	val = (u64) ((u64 ) data);
	86	break;
	87	default:
	88	val = 0; /* let FW report error */
	89	break;
	90	}
9389339f	91	return zpci_store(val, req, offset);
cd248341 JG	92	}
	93
	94	static inline int zpci_read_single(u64 req, u64 *dst, u64 offset, u8 len)
	95	{
	96	u64 data;
f0bacb7f	97	int cc;
cd248341	98
9389339f	99	cc = zpci_load(&data, req, offset);
b170bad4 SO	100	if (cc)
	101	goto out;
	102
cd248341 JG	103	switch (len) {
	104	case 1:
	105	((u8 ) dst) = (u8) data;
	106	break;
	107	case 2:
	108	((u16 ) dst) = (u16) data;
	109	break;
	110	case 4:
	111	((u32 ) dst) = (u32) data;
	112	break;
	113	case 8:
	114	((u64 ) dst) = (u64) data;
	115	break;
	116	}
b170bad4	117	out:
cd248341 JG	118	return cc;
	119	}
	120
	121	static inline int zpci_write_block(u64 req, const u64 *data, u64 offset)
	122	{
9389339f	123	return zpci_store_block(data, req, offset);
cd248341 JG	124	}
	125
	126	static inline u8 zpci_get_max_write_size(u64 src, u64 dst, int len, int max)
	127	{
	128	int count = len > max ? max : len, size = 1;
	129
	130	while (!(src & 0x1) && !(dst & 0x1) && ((size << 1) <= count)) {
	131	dst = dst >> 1;
	132	src = src >> 1;
	133	size = size << 1;
	134	}
	135	return size;
	136	}
	137
	138	static inline int zpci_memcpy_fromio(void *dst,
	139	const volatile void __iomem *src,
	140	unsigned long n)
	141	{
	142	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(src)];
	143	u64 req, offset = ZPCI_OFFSET(src);
	144	int size, rc = 0;
	145
	146	while (n > 0) {
5b9f2081 MS	147	size = zpci_get_max_write_size((u64 __force) src,
5b9f2081 MS	148	(u64) dst, n, 8);
cd248341 JG	149	req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
	150	rc = zpci_read_single(req, dst, offset, size);
	151	if (rc)
	152	break;
	153	offset += size;
	154	dst += size;
	155	n -= size;
	156	}
	157	return rc;
	158	}
	159
	160	static inline int zpci_memcpy_toio(volatile void __iomem *dst,
	161	const void *src, unsigned long n)
	162	{
	163	struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(dst)];
	164	u64 req, offset = ZPCI_OFFSET(dst);
	165	int size, rc = 0;
	166
	167	if (!src)
	168	return -EINVAL;
	169
	170	while (n > 0) {
5b9f2081 MS	171	size = zpci_get_max_write_size((u64 __force) dst,
5b9f2081 MS	172	(u64) src, n, 128);
cd248341 JG	173	req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
	174
	175	if (size > 8) /* main path */
	176	rc = zpci_write_block(req, src, offset);
	177	else
	178	rc = zpci_write_single(req, src, offset, size);
	179	if (rc)
	180	break;
	181	offset += size;
	182	src += size;
	183	n -= size;
	184	}
	185	return rc;
	186	}
	187
	188	static inline int zpci_memset_io(volatile void __iomem *dst,
	189	unsigned char val, size_t count)
	190	{
	191	u8 *src = kmalloc(count, GFP_KERNEL);
	192	int rc;
	193
	194	if (src == NULL)
	195	return -ENOMEM;
	196	memset(src, val, count);
	197
	198	rc = zpci_memcpy_toio(dst, src, count);
	199	kfree(src);
	200	return rc;
	201	}
	202
	203	#endif /* CONFIG_PCI */
	204
	205	#endif /* _ASM_S390_PCI_IO_H */