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/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright(c) 2020 Intel Corporation. */
#ifndef __CXL_H__
#define __CXL_H__
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/io.h>
/* CXL 2.0 8.2.8.1 Device Capabilities Array Register */
#define CXLDEV_CAP_ARRAY_OFFSET 0x0
#define CXLDEV_CAP_ARRAY_CAP_ID 0
#define CXLDEV_CAP_ARRAY_ID_MASK GENMASK_ULL(15, 0)
#define CXLDEV_CAP_ARRAY_COUNT_MASK GENMASK_ULL(47, 32)
/* CXL 2.0 8.2.8.2 CXL Device Capability Header Register */
#define CXLDEV_CAP_HDR_CAP_ID_MASK GENMASK(15, 0)
/* CXL 2.0 8.2.8.2.1 CXL Device Capabilities */
#define CXLDEV_CAP_CAP_ID_DEVICE_STATUS 0x1
#define CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX 0x2
#define CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX 0x3
#define CXLDEV_CAP_CAP_ID_MEMDEV 0x4000
/* CXL 2.0 8.2.8.4 Mailbox Registers */
#define CXLDEV_MBOX_CAPS_OFFSET 0x00
#define CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK GENMASK(4, 0)
#define CXLDEV_MBOX_CTRL_OFFSET 0x04
#define CXLDEV_MBOX_CTRL_DOORBELL BIT(0)
#define CXLDEV_MBOX_CMD_OFFSET 0x08
#define CXLDEV_MBOX_CMD_COMMAND_OPCODE_MASK GENMASK_ULL(15, 0)
#define CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK GENMASK_ULL(36, 16)
#define CXLDEV_MBOX_STATUS_OFFSET 0x10
#define CXLDEV_MBOX_STATUS_RET_CODE_MASK GENMASK_ULL(47, 32)
#define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18
#define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20
/*
* CXL_DEVICE_REGS - Common set of CXL Device register block base pointers
* @status: CXL 2.0 8.2.8.3 Device Status Registers
* @mbox: CXL 2.0 8.2.8.4 Mailbox Registers
* @memdev: CXL 2.0 8.2.8.5 Memory Device Registers
*/
#define CXL_DEVICE_REGS() \
void __iomem *status; \
void __iomem *mbox; \
void __iomem *memdev
/* See note for 'struct cxl_regs' for the rationale of this organization */
struct cxl_device_regs {
CXL_DEVICE_REGS();
};
/*
* Note, the anonymous union organization allows for per
* register-block-type helper routines, without requiring block-type
* agnostic code to include the prefix.
*/
struct cxl_regs {
union {
struct {
CXL_DEVICE_REGS();
};
struct cxl_device_regs device_regs;
};
};
struct cxl_reg_map {
bool valid;
unsigned long offset;
unsigned long size;
};
struct cxl_device_reg_map {
struct cxl_reg_map status;
struct cxl_reg_map mbox;
struct cxl_reg_map memdev;
};
struct cxl_register_map {
struct list_head list;
u64 block_offset;
u8 reg_type;
u8 barno;
union {
struct cxl_device_reg_map device_map;
};
};
void cxl_probe_device_regs(struct device *dev, void __iomem *base,
struct cxl_device_reg_map *map);
int cxl_map_device_regs(struct pci_dev *pdev,
struct cxl_device_regs *regs,
struct cxl_register_map *map);
extern struct bus_type cxl_bus_type;
#endif /* __CXL_H__ */
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