/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_EADM_H
#define _ASM_S390_EADM_H

#include <linux/types.h>
#include <linux/device.h>
#include <linux/blk_types.h>
#include <asm/dma-types.h>

struct arqb {
        u64 data;
        u16 fmt:4;
        u16:12;
        u16 cmd_code;
        u16:16;
        u16 msb_count;
        u32 reserved[12];
} __packed;

#define ARQB_CMD_MOVE   1

struct arsb {
        u16 fmt:4;
        u32:28;
        u8 ef;
        u8:8;
        u8 ecbi;
        u8:8;
        u8 fvf;
        u16:16;
        u8 eqc;
        u32:32;
        u64 fail_msb;
        u64 fail_aidaw;
        u64 fail_ms;
        u64 fail_scm;
        u32 reserved[4];
} __packed;

#define EQC_WR_PROHIBIT 22

struct msb {
        u8 fmt:4;
        u8 oc:4;
        u8 flags;
        u16:12;
        u16 bs:4;
        u32 blk_count;
        dma64_t data_addr;
        u64 scm_addr;
        u64:64;
} __packed;

struct aidaw {
        u8 flags;
        u32 :24;
        u32 :32;
        dma64_t data_addr;
} __packed;

#define MSB_OC_CLEAR    0
#define MSB_OC_READ     1
#define MSB_OC_WRITE    2
#define MSB_OC_RELEASE  3

#define MSB_FLAG_BNM    0x80
#define MSB_FLAG_IDA    0x40

#define MSB_BS_4K       0
#define MSB_BS_1M       1

#define AOB_NR_MSB      124

struct aob {
        struct arqb request;
        struct arsb response;
        struct msb msb[AOB_NR_MSB];
} __packed __aligned(PAGE_SIZE);

struct aob_rq_header {
        struct scm_device *scmdev;
        char data[];
};

struct scm_device {
        u64 address;
        u64 size;
        unsigned int nr_max_block;
        struct device dev;
        struct {
                unsigned int persistence:4;
                unsigned int oper_state:4;
                unsigned int data_state:4;
                unsigned int rank:4;
                unsigned int release:1;
                unsigned int res_id:8;
        } __packed attrs;
};

#define OP_STATE_GOOD           1
#define OP_STATE_TEMP_ERR       2
#define OP_STATE_PERM_ERR       3

enum scm_event {SCM_CHANGE, SCM_AVAIL};

struct scm_driver {
        struct device_driver drv;
        int (*probe) (struct scm_device *scmdev);
        void (*remove) (struct scm_device *scmdev);
        void (*notify) (struct scm_device *scmdev, enum scm_event event);
        void (*handler) (struct scm_device *scmdev, void *data,
                        blk_status_t error);
};

int scm_driver_register(struct scm_driver *scmdrv);
void scm_driver_unregister(struct scm_driver *scmdrv);

int eadm_start_aob(struct aob *aob);
void scm_irq_handler(struct aob *aob, blk_status_t error);

#endif /* _ASM_S390_EADM_H */