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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright IBM Corp. 2002, 2009
 *
 * 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>
#include <asm/fcx.h>
#include <asm/irq.h>
#include <asm/schid.h>

/* structs from asm/cio.h */
struct irb;
struct ccw1;
struct ccw_dev_id;

/* 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 NULL;
}

/**
 * struct ccw_device - channel attached device
 * @ccwlock: pointer to device lock
 * @id: id of this device
 * @drv: ccw driver for this device
 * @dev: embedded device structure
 * @online: online status of device
 * @handler: interrupt handler
 *
 * @handler is a member of the device rather than the driver since a driver
 * can have different interrupt handlers for different ccw devices
 * (multi-subchannel drivers).
 */
struct ccw_device {
	spinlock_t *ccwlock;
/* private: */
	struct ccw_device_private *private;	/* cio private information */
/* public: */
	struct ccw_device_id id;
	struct ccw_driver *drv;
	struct device dev;
	int online;
	void (*handler) (struct ccw_device *, unsigned long, struct irb *);
};

/*
 * Possible events used by the path_event notifier.
 */
#define PE_NONE				0x0
#define PE_PATH_GONE			0x1 /* A path is no longer available. */
#define PE_PATH_AVAILABLE		0x2 /* A path has become available and
					       was successfully verified. */
#define PE_PATHGROUP_ESTABLISHED	0x4 /* A pathgroup was reset and had
					       to be established again. */

/*
 * Possible CIO actions triggered by the unit check handler.
 */
enum uc_todo {
	UC_TODO_RETRY,
	UC_TODO_RETRY_ON_NEW_PATH,
	UC_TODO_STOP
};

/**
 * struct ccw driver - device driver for channel attached devices
 * @ids: ids supported by this driver
 * @probe: function called on probe
 * @remove: function called on remove
 * @set_online: called when setting device online
 * @set_offline: called when setting device offline
 * @notify: notify driver of device state changes
 * @path_event: notify driver of channel path events
 * @shutdown: called at device shutdown
 * @prepare: prepare for pm state transition
 * @complete: undo work done in @prepare
 * @freeze: callback for freezing during hibernation snapshotting
 * @thaw: undo work done in @freeze
 * @restore: callback for restoring after hibernation
 * @uc_handler: callback for unit check handler
 * @driver: embedded device driver structure
 * @int_class: interruption class to use for accounting interrupts
 */
struct ccw_driver {
	struct ccw_device_id *ids;
	int (*probe) (struct ccw_device *);
	void (*remove) (struct ccw_device *);
	int (*set_online) (struct ccw_device *);
	int (*set_offline) (struct ccw_device *);
	int (*notify) (struct ccw_device *, int);
	void (*path_event) (struct ccw_device *, int *);
	void (*shutdown) (struct ccw_device *);
	int (*prepare) (struct ccw_device *);
	void (*complete) (struct ccw_device *);
	int (*freeze)(struct ccw_device *);
	int (*thaw) (struct ccw_device *);
	int (*restore)(struct ccw_device *);
	enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);
	struct device_driver driver;
	enum interruption_class int_class;
};

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_mask(struct ccw_device *, unsigned long);
extern int ccw_device_set_options(struct ccw_device *, unsigned long);
extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
int ccw_device_is_pathgroup(struct ccw_device *cdev);
int ccw_device_is_multipath(struct ccw_device *cdev);

/* 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
/* Try to use multipath mode. */
#define CCWDEV_DO_MULTIPATH		0x0010

extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
			    unsigned long, __u8, unsigned long);
extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
				    unsigned long, __u8, unsigned long, int);
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);
int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
			    unsigned long intparm, u8 lpm, u8 key);
int ccw_device_tm_start_key(struct ccw_device *, struct tcw *,
			    unsigned long, u8, u8);
int ccw_device_tm_start_timeout_key(struct ccw_device *, struct tcw *,
			    unsigned long, u8, u8, int);
int ccw_device_tm_start(struct ccw_device *, struct tcw *,
			    unsigned long, u8);
int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *,
			    unsigned long, u8, int);
int ccw_device_tm_intrg(struct ccw_device *cdev);

int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask);

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 *);
extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);

#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_create_console(struct ccw_driver *);
extern void ccw_device_destroy_console(struct ccw_device *);
extern int ccw_device_enable_console(struct ccw_device *);
extern void ccw_device_wait_idle(struct ccw_device *);
extern int ccw_device_force_console(struct ccw_device *);

int ccw_device_siosl(struct ccw_device *);

extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);

struct channel_path_desc *ccw_device_get_chp_desc(struct ccw_device *, int);
#endif /* _S390_CCWDEV_H_ */

Filemanager

Name Type Size Permission Actions
fpu Folder 0755
trace Folder 0755
Kbuild File 557 B 0644
airq.h File 3.02 KB 0644
alternative-asm.h File 3.07 KB 0644
alternative.h File 4.99 KB 0644
ap.h File 9.9 KB 0644
appldata.h File 1.54 KB 0644
archrandom.h File 1.1 KB 0644
asm-prototypes.h File 227 B 0644
atomic.h File 5.1 KB 0644
atomic_ops.h File 4.02 KB 0644
barrier.h File 1.84 KB 0644
bitops.h File 10.13 KB 0644
bug.h File 1.49 KB 0644
bugs.h File 441 B 0644
cache.h File 387 B 0644
ccwdev.h File 7.99 KB 0644
ccwgroup.h File 2.53 KB 0644
checksum.h File 3.24 KB 0644
chpid.h File 974 B 0644
cio.h File 8.01 KB 0644
clp.h File 1.32 KB 0644
cmb.h File 425 B 0644
cmpxchg.h File 1.76 KB 0644
compat.h File 7.9 KB 0644
cpacf.h File 16.8 KB 0644
cpcmd.h File 1.11 KB 0644
cpu.h File 549 B 0644
cpu_mf.h File 8.99 KB 0644
cpufeature.h File 963 B 0644
cputime.h File 805 B 0644
crw.h File 1.86 KB 0644
css_chars.h File 769 B 0644
ctl_reg.h File 2.89 KB 0644
current.h File 405 B 0644
debug.h File 8.1 KB 0644
delay.h File 721 B 0644
diag.h File 5.94 KB 0644
dis.h File 637 B 0644
dma-mapping.h File 621 B 0644
dma.h File 456 B 0644
eadm.h File 2.03 KB 0644
ebcdic.h File 1.41 KB 0644
elf.h File 10.36 KB 0644
exec.h File 269 B 0644
extable.h File 875 B 0644
extmem.h File 804 B 0644
facility.h File 2.44 KB 0644
fcx.h File 7.91 KB 0644
ftrace.h File 1.66 KB 0644
futex.h File 2.07 KB 0644
gmap.h File 4.93 KB 0644
hardirq.h File 670 B 0644
hugetlb.h File 2.82 KB 0644
hw_irq.h File 249 B 0644
idals.h File 5.22 KB 0644
idle.h File 709 B 0644
io.h File 2.03 KB 0644
ipl.h File 3.6 KB 0644
irq.h File 2.55 KB 0644
irqflags.h File 1.76 KB 0644
isc.h File 1000 B 0644
itcw.h File 950 B 0644
jump_label.h File 1.36 KB 0644
kdebug.h File 386 B 0644
kexec.h File 1.32 KB 0644
kprobes.h File 2.24 KB 0644
kvm_host.h File 22.24 KB 0644
kvm_para.h File 5.78 KB 0644
linkage.h File 633 B 0644
livepatch.h File 461 B 0644
lowcore.h File 6.29 KB 0644
mmu.h File 1.19 KB 0644
mmu_context.h File 3.84 KB 0644
mmzone.h File 316 B 0644
module.h File 802 B 0644
nmi.h File 3.44 KB 0644
nospec-branch.h File 342 B 0644
nospec-insn.h File 3.81 KB 0644
numa.h File 730 B 0644
os_info.h File 1.1 KB 0644
page-states.h File 486 B 0644
page.h File 5.12 KB 0644
pci.h File 6.26 KB 0644
pci_clp.h File 4.25 KB 0644
pci_debug.h File 608 B 0644
pci_dma.h File 5.7 KB 0644
pci_insn.h File 2.59 KB 0644
pci_io.h File 4.58 KB 0644
percpu.h File 6.43 KB 0644
perf_event.h File 2.71 KB 0644
pgalloc.h File 4.32 KB 0644
pgtable.h File 47.7 KB 0644
pkey.h File 4.23 KB 0644
preempt.h File 3.25 KB 0644
processor.h File 10.42 KB 0644
ptrace.h File 5.27 KB 0644
qdio.h File 11.67 KB 0644
reset.h File 471 B 0644
runtime_instr.h File 1.76 KB 0644
schid.h File 525 B 0644
sclp.h File 3.38 KB 0644
scsw.h File 24.1 KB 0644
seccomp.h File 516 B 0644
sections.h File 155 B 0644
segment.h File 93 B 0644
serial.h File 147 B 0644
set_memory.h File 779 B 0644
setup.h File 4.44 KB 0644
shmparam.h File 285 B 0644
signal.h File 644 B 0644
sigp.h File 1.8 KB 0644
smp.h File 2.45 KB 0644
sparsemem.h File 214 B 0644
spinlock.h File 3.53 KB 0644
spinlock_types.h File 437 B 0644
stp.h File 1.26 KB 0644
string.h File 4.5 KB 0644
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syscall.h File 2.63 KB 0644
sysinfo.h File 4.22 KB 0644
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timex.h File 6.15 KB 0644
tlb.h File 5.71 KB 0644
tlbflush.h File 3.52 KB 0644
topology.h File 2.69 KB 0644
uaccess.h File 6.57 KB 0644
unistd.h File 1.03 KB 0644
uprobes.h File 588 B 0644
user.h File 3.3 KB 0644
vdso.h File 1.8 KB 0644
vga.h File 170 B 0644
vtime.h File 182 B 0644
vtimer.h File 866 B 0644
vx-insn.h File 10.66 KB 0644
xor.h File 454 B 0644