Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 206 insertions, 0 deletions

diff --git a/arch/s390/include/asm/pci_io.h b/arch/s390/include/asm/pci_io.h
new file mode 100644
index 000000000..2686bee80
--- /dev/null
+++ b/arch/s390/include/asm/pci_io.h
@@ -0,0 +1,206 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#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 size constraints */
+#define ZPCI_MAX_READ_SIZE	8
+#define ZPCI_MAX_WRITE_SIZE	128
+#define ZPCI_BOUNDARY_SIZE	(1 << 12)
+#define ZPCI_BOUNDARY_MASK	(ZPCI_BOUNDARY_SIZE - 1)
+
+/* I/O Map */
+#define ZPCI_IOMAP_SHIFT		48
+#define ZPCI_IOMAP_ADDR_SHIFT		62
+#define ZPCI_IOMAP_ADDR_BASE		(1UL << ZPCI_IOMAP_ADDR_SHIFT)
+#define ZPCI_IOMAP_ADDR_OFF_MASK	((1UL << ZPCI_IOMAP_SHIFT) - 1)
+#define ZPCI_IOMAP_MAX_ENTRIES							\
+	(1UL << (ZPCI_IOMAP_ADDR_SHIFT - ZPCI_IOMAP_SHIFT))
+#define ZPCI_IOMAP_ADDR_IDX_MASK						\
+	((ZPCI_IOMAP_ADDR_BASE - 1) & ~ZPCI_IOMAP_ADDR_OFF_MASK)
+
+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)	\
+{										\
+	u64 data;								\
+	int rc;									\
+										\
+	rc = zpci_load(&data, addr, LENGTH);					\
+	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)	\
+{										\
+	u64 data = (VALTYPE) val;						\
+										\
+	zpci_store(addr, data, LENGTH);						\
+}
+
+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(volatile void __iomem *dst, const void *src,
+				    unsigned long len)
+{
+	u64 val;
+
+	switch (len) {
+	case 1:
+		val = (u64) *((u8 *) src);
+		break;
+	case 2:
+		val = (u64) *((u16 *) src);
+		break;
+	case 4:
+		val = (u64) *((u32 *) src);
+		break;
+	case 8:
+		val = (u64) *((u64 *) src);
+		break;
+	default:
+		val = 0;		/* let FW report error */
+		break;
+	}
+	return zpci_store(dst, val, len);
+}
+
+static inline int zpci_read_single(void *dst, const volatile void __iomem *src,
+				   unsigned long len)
+{
+	u64 data;
+	int cc;
+
+	cc = zpci_load(&data, src, len);
+	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;
+}
+
+int zpci_write_block(volatile void __iomem *dst, const void *src,
+		     unsigned long len);
+
+static inline int zpci_get_max_io_size(u64 src, u64 dst, int len, int max)
+{
+	int offset = dst & ZPCI_BOUNDARY_MASK;
+	int size;
+
+	size = min3(len, ZPCI_BOUNDARY_SIZE - offset, max);
+	if (IS_ALIGNED(src, 8) && IS_ALIGNED(dst, 8) && IS_ALIGNED(size, 8))
+		return size;
+
+	if (size >= 8)
+		return 8;
+	return rounddown_pow_of_two(size);
+}
+
+static inline int zpci_memcpy_fromio(void *dst,
+				     const volatile void __iomem *src,
+				     unsigned long n)
+{
+	int size, rc = 0;
+
+	while (n > 0) {
+		size = zpci_get_max_io_size((u64 __force) src,
+					    (u64) dst, n,
+					    ZPCI_MAX_READ_SIZE);
+		rc = zpci_read_single(dst, src, size);
+		if (rc)
+			break;
+		src += size;
+		dst += size;
+		n -= size;
+	}
+	return rc;
+}
+
+static inline int zpci_memcpy_toio(volatile void __iomem *dst,
+				   const void *src, unsigned long n)
+{
+	int size, rc = 0;
+
+	if (!src)
+		return -EINVAL;
+
+	while (n > 0) {
+		size = zpci_get_max_io_size((u64 __force) dst,
+					    (u64) src, n,
+					    ZPCI_MAX_WRITE_SIZE);
+		if (size > 8) /* main path */
+			rc = zpci_write_block(dst, src, size);
+		else
+			rc = zpci_write_single(dst, src, size);
+		if (rc)
+			break;
+		src += size;
+		dst += 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 */