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Diffstat (limited to 'include/asm-s390/ccwdev.h')
| -rw-r--r-- | include/asm-s390/ccwdev.h | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/include/asm-s390/ccwdev.h b/include/asm-s390/ccwdev.h new file mode 100644 index 000000000000..3eb231af5d51 --- /dev/null +++ b/include/asm-s390/ccwdev.h @@ -0,0 +1,192 @@ +/* + * include/asm-s390/ccwdev.h + * include/asm-s390x/ccwdev.h + * + * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Author(s): Arnd Bergmann <arndb@de.ibm.com> + * + * Interface for CCW device drivers + */ +#ifndef _S390_CCWDEV_H_ +#define _S390_CCWDEV_H_ + +#include <linux/device.h> +#include <linux/mod_devicetable.h> + +/* structs from asm/cio.h */ +struct irb; +struct ccw1; + +/* simplified initializers for struct ccw_device: + * CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one + * entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */ +#define CCW_DEVICE(cu, cum) \ + .cu_type=(cu), .cu_model=(cum), \ + .match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE \ + | (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0)) + +#define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm) \ + .cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\ + .match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE \ + | ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0) \ + | CCW_DEVICE_ID_MATCH_DEVICE_TYPE \ + | ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0) + +/* scan through an array of device ids and return the first + * entry that matches the device. + * + * the array must end with an entry containing zero match_flags + */ +static inline const struct ccw_device_id * +ccw_device_id_match(const struct ccw_device_id *array, + const struct ccw_device_id *match) +{ + const struct ccw_device_id *id = array; + + for (id = array; id->match_flags; id++) { + if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE) + && (id->cu_type != match->cu_type)) + continue; + + if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL) + && (id->cu_model != match->cu_model)) + continue; + + if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE) + && (id->dev_type != match->dev_type)) + continue; + + if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL) + && (id->dev_model != match->dev_model)) + continue; + + return id; + } + + return 0; +} + +/* The struct ccw device is our replacement for the globally accessible + * ioinfo array. ioinfo will mutate into a subchannel device later. + * + * Reference: Documentation/s390/driver-model.txt */ +struct ccw_device { + spinlock_t *ccwlock; + struct ccw_device_private *private; /* cio private information */ + struct ccw_device_id id; /* id of this device, driver_info is + set by ccw_find_driver */ + struct ccw_driver *drv; /* */ + struct device dev; /* */ + int online; + /* This is sick, but a driver can have different interrupt handlers + for different ccw_devices (multi-subchannel drivers)... */ + void (*handler) (struct ccw_device *, unsigned long, struct irb *); +}; + + +/* Each ccw driver registers with the ccw root bus */ +struct ccw_driver { + struct module *owner; /* for automatic MOD_INC_USE_COUNT */ + struct ccw_device_id *ids; /* probe driver with these devs */ + int (*probe) (struct ccw_device *); /* ask driver to probe dev */ + void (*remove) (struct ccw_device *); + /* device is no longer available */ + int (*set_online) (struct ccw_device *); + int (*set_offline) (struct ccw_device *); + int (*notify) (struct ccw_device *, int); + struct device_driver driver; /* higher level structure, don't init + this from your driver */ + char *name; +}; + +extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, + const char *bus_id); + +/* devices drivers call these during module load and unload. + * When a driver is registered, its probe method is called + * when new devices for its type pop up */ +extern int ccw_driver_register (struct ccw_driver *driver); +extern void ccw_driver_unregister (struct ccw_driver *driver); + +struct ccw1; + +extern int ccw_device_set_options(struct ccw_device *, unsigned long); + +/* Allow for i/o completion notification after primary interrupt status. */ +#define CCWDEV_EARLY_NOTIFICATION 0x0001 +/* Report all interrupt conditions. */ +#define CCWDEV_REPORT_ALL 0x0002 +/* Try to perform path grouping. */ +#define CCWDEV_DO_PATHGROUP 0x0004 +/* Allow forced onlining of boxed devices. */ +#define CCWDEV_ALLOW_FORCE 0x0008 + +/* + * ccw_device_start() + * + * Start a S/390 channel program. When the interrupt arrives, the + * IRQ handler is called, either immediately, delayed (dev-end missing, + * or sense required) or never (no IRQ handler registered). + * Depending on the action taken, ccw_device_start() returns: + * 0 - Success + * -EBUSY - Device busy, or status pending + * -ENODEV - Device not operational + * -EINVAL - Device invalid for operation + */ +extern int ccw_device_start(struct ccw_device *, struct ccw1 *, + unsigned long, __u8, unsigned long); +/* + * ccw_device_start_timeout() + * + * This function notifies the device driver if the channel program has not + * completed during the specified time. If a timeout occurs, the channel + * program is terminated via xsch(), hsch() or csch(). + */ +extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *, + unsigned long, __u8, unsigned long, int); +/* + * ccw_device_start_key() + * ccw_device_start_key_timeout() + * + * Same as ccw_device_start() and ccw_device_start_timeout(), except a + * storage key != default key can be provided for the I/O. + */ +extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *, + unsigned long, __u8, __u8, unsigned long); +extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *, + unsigned long, __u8, __u8, + unsigned long, int); + + +extern int ccw_device_resume(struct ccw_device *); +extern int ccw_device_halt(struct ccw_device *, unsigned long); +extern int ccw_device_clear(struct ccw_device *, unsigned long); + +extern int read_dev_chars(struct ccw_device *cdev, void **buffer, int length); +extern int read_conf_data(struct ccw_device *cdev, void **buffer, int *length); +extern int read_conf_data_lpm(struct ccw_device *cdev, void **buffer, + int *length, __u8 lpm); + +extern int ccw_device_set_online(struct ccw_device *cdev); +extern int ccw_device_set_offline(struct ccw_device *cdev); + + +extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd); +extern __u8 ccw_device_get_path_mask(struct ccw_device *); + +#define get_ccwdev_lock(x) (x)->ccwlock + +#define to_ccwdev(n) container_of(n, struct ccw_device, dev) +#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver) + +extern struct ccw_device *ccw_device_probe_console(void); + +// FIXME: these have to go +extern int _ccw_device_get_device_number(struct ccw_device *); +extern int _ccw_device_get_subchannel_number(struct ccw_device *); + +extern struct device *s390_root_dev_register(const char *); +extern void s390_root_dev_unregister(struct device *); + +extern void *ccw_device_get_chp_desc(struct ccw_device *, int); +#endif /* _S390_CCWDEV_H_ */ |