linux/arch/s390/include/asm/ccwdev.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright IBM Corp. 2002, 2009
   4 *
   5 * Author(s): Arnd Bergmann <arndb@de.ibm.com>
   6 *
   7 * Interface for CCW device drivers
   8 */
   9#ifndef _S390_CCWDEV_H_
  10#define _S390_CCWDEV_H_
  11
  12#include <linux/device.h>
  13#include <linux/mod_devicetable.h>
  14#include <asm/chsc.h>
  15#include <asm/fcx.h>
  16#include <asm/irq.h>
  17#include <asm/schid.h>
  18
  19/* structs from asm/cio.h */
  20struct irb;
  21struct ccw1;
  22struct ccw_dev_id;
  23
  24/* simplified initializers for struct ccw_device:
  25 * CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
  26 * entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
  27#define CCW_DEVICE(cu, cum)                                             \
  28        .cu_type=(cu), .cu_model=(cum),                                 \
  29        .match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE                       \
  30                   | (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0))
  31
  32#define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm)                          \
  33        .cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
  34        .match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE                        \
  35                   | ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0)         \
  36                   | CCW_DEVICE_ID_MATCH_DEVICE_TYPE                    \
  37                   | ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0)
  38
  39/* scan through an array of device ids and return the first
  40 * entry that matches the device.
  41 *
  42 * the array must end with an entry containing zero match_flags
  43 */
  44static inline const struct ccw_device_id *
  45ccw_device_id_match(const struct ccw_device_id *array,
  46                        const struct ccw_device_id *match)
  47{
  48        const struct ccw_device_id *id = array;
  49
  50        for (id = array; id->match_flags; id++) {
  51                if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE)
  52                    && (id->cu_type != match->cu_type))
  53                        continue;
  54
  55                if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
  56                    && (id->cu_model != match->cu_model))
  57                        continue;
  58
  59                if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
  60                    && (id->dev_type != match->dev_type))
  61                        continue;
  62
  63                if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
  64                    && (id->dev_model != match->dev_model))
  65                        continue;
  66
  67                return id;
  68        }
  69
  70        return NULL;
  71}
  72
  73/**
  74 * struct ccw_device - channel attached device
  75 * @ccwlock: pointer to device lock
  76 * @id: id of this device
  77 * @drv: ccw driver for this device
  78 * @dev: embedded device structure
  79 * @online: online status of device
  80 * @handler: interrupt handler
  81 *
  82 * @handler is a member of the device rather than the driver since a driver
  83 * can have different interrupt handlers for different ccw devices
  84 * (multi-subchannel drivers).
  85 */
  86struct ccw_device {
  87        spinlock_t *ccwlock;
  88/* private: */
  89        struct ccw_device_private *private;     /* cio private information */
  90/* public: */
  91        struct ccw_device_id id;
  92        struct ccw_driver *drv;
  93        struct device dev;
  94        int online;
  95        void (*handler) (struct ccw_device *, unsigned long, struct irb *);
  96};
  97
  98/*
  99 * Possible events used by the path_event notifier.
 100 */
 101#define PE_NONE                         0x0
 102#define PE_PATH_GONE                    0x1 /* A path is no longer available. */
 103#define PE_PATH_AVAILABLE               0x2 /* A path has become available and
 104                                               was successfully verified. */
 105#define PE_PATHGROUP_ESTABLISHED        0x4 /* A pathgroup was reset and had
 106                                               to be established again. */
 107#define PE_PATH_FCES_EVENT              0x8 /* The FCES Status of a path has
 108                                             * changed. */
 109
 110/*
 111 * Possible CIO actions triggered by the unit check handler.
 112 */
 113enum uc_todo {
 114        UC_TODO_RETRY,
 115        UC_TODO_RETRY_ON_NEW_PATH,
 116        UC_TODO_STOP
 117};
 118
 119/**
 120 * struct ccw_driver - device driver for channel attached devices
 121 * @ids: ids supported by this driver
 122 * @probe: function called on probe
 123 * @remove: function called on remove
 124 * @set_online: called when setting device online
 125 * @set_offline: called when setting device offline
 126 * @notify: notify driver of device state changes
 127 * @path_event: notify driver of channel path events
 128 * @shutdown: called at device shutdown
 129 * @uc_handler: callback for unit check handler
 130 * @driver: embedded device driver structure
 131 * @int_class: interruption class to use for accounting interrupts
 132 */
 133struct ccw_driver {
 134        struct ccw_device_id *ids;
 135        int (*probe) (struct ccw_device *);
 136        void (*remove) (struct ccw_device *);
 137        int (*set_online) (struct ccw_device *);
 138        int (*set_offline) (struct ccw_device *);
 139        int (*notify) (struct ccw_device *, int);
 140        void (*path_event) (struct ccw_device *, int *);
 141        void (*shutdown) (struct ccw_device *);
 142        enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);
 143        struct device_driver driver;
 144        enum interruption_class int_class;
 145};
 146
 147extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
 148                                              const char *bus_id);
 149
 150/* devices drivers call these during module load and unload.
 151 * When a driver is registered, its probe method is called
 152 * when new devices for its type pop up */
 153extern int  ccw_driver_register   (struct ccw_driver *driver);
 154extern void ccw_driver_unregister (struct ccw_driver *driver);
 155extern int ccw_device_set_options_mask(struct ccw_device *, unsigned long);
 156extern int ccw_device_set_options(struct ccw_device *, unsigned long);
 157extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
 158int ccw_device_is_pathgroup(struct ccw_device *cdev);
 159int ccw_device_is_multipath(struct ccw_device *cdev);
 160
 161/* Allow for i/o completion notification after primary interrupt status. */
 162#define CCWDEV_EARLY_NOTIFICATION       0x0001
 163/* Report all interrupt conditions. */
 164#define CCWDEV_REPORT_ALL               0x0002
 165/* Try to perform path grouping. */
 166#define CCWDEV_DO_PATHGROUP             0x0004
 167/* Allow forced onlining of boxed devices. */
 168#define CCWDEV_ALLOW_FORCE              0x0008
 169/* Try to use multipath mode. */
 170#define CCWDEV_DO_MULTIPATH             0x0010
 171
 172extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
 173                            unsigned long, __u8, unsigned long);
 174extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
 175                                    unsigned long, __u8, unsigned long, int);
 176extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
 177                                unsigned long, __u8, __u8, unsigned long);
 178extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
 179                                        unsigned long, __u8, __u8,
 180                                        unsigned long, int);
 181
 182
 183extern int ccw_device_resume(struct ccw_device *);
 184extern int ccw_device_halt(struct ccw_device *, unsigned long);
 185extern int ccw_device_clear(struct ccw_device *, unsigned long);
 186int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
 187                            unsigned long intparm, u8 lpm, u8 key);
 188int ccw_device_tm_start_key(struct ccw_device *, struct tcw *,
 189                            unsigned long, u8, u8);
 190int ccw_device_tm_start_timeout_key(struct ccw_device *, struct tcw *,
 191                            unsigned long, u8, u8, int);
 192int ccw_device_tm_start(struct ccw_device *, struct tcw *,
 193                            unsigned long, u8);
 194int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *,
 195                            unsigned long, u8, int);
 196int ccw_device_tm_intrg(struct ccw_device *cdev);
 197
 198int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask);
 199
 200extern int ccw_device_set_online(struct ccw_device *cdev);
 201extern int ccw_device_set_offline(struct ccw_device *cdev);
 202
 203
 204extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
 205extern __u8 ccw_device_get_path_mask(struct ccw_device *);
 206extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
 207
 208#define get_ccwdev_lock(x) (x)->ccwlock
 209
 210#define to_ccwdev(n) container_of(n, struct ccw_device, dev)
 211#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
 212
 213extern struct ccw_device *ccw_device_create_console(struct ccw_driver *);
 214extern void ccw_device_destroy_console(struct ccw_device *);
 215extern int ccw_device_enable_console(struct ccw_device *);
 216extern void ccw_device_wait_idle(struct ccw_device *);
 217extern int ccw_device_force_console(struct ccw_device *);
 218
 219extern void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size);
 220extern void ccw_device_dma_free(struct ccw_device *cdev,
 221                                void *cpu_addr, size_t size);
 222
 223int ccw_device_siosl(struct ccw_device *);
 224
 225extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);
 226
 227struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *, int);
 228u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx);
 229int ccw_device_pnso(struct ccw_device *cdev,
 230                    struct chsc_pnso_area *pnso_area, u8 oc,
 231                    struct chsc_pnso_resume_token resume_token, int cnc);
 232int ccw_device_get_cssid(struct ccw_device *cdev, u8 *cssid);
 233int ccw_device_get_iid(struct ccw_device *cdev, u8 *iid);
 234int ccw_device_get_chpid(struct ccw_device *cdev, int chp_idx, u8 *chpid);
 235int ccw_device_get_chid(struct ccw_device *cdev, int chp_idx, u16 *chid);
 236#endif /* _S390_CCWDEV_H_ */
 237