highlevel.c

1394在linux下单独的驱动程序代码

/*
* IEEE 1394 for Linux
*
* Copyright (C) 1999 Andreas E. Bombe
*
* This code is licensed under the GPL.  See the file COPYING in the root
* directory of the kernel sources for details.
*
*
* Contributions:
*
* Christian Toegel <[e-mail]>
*        unregister address space
*
* Manfred Weihs <[e-mail]>
*        unregister address space
*
*/

#include <linux/config.h>
#include <linux/slab.h>
#include <linux/list.h>

#include "ieee1394.h"
#include "ieee1394_types.h"
#include "hosts.h"
#include "ieee1394_core.h"
#include "highlevel.h"


struct hl_host_info {
	struct list_head list;
	struct hpsb_host *host;
	size_t size;
	unsigned long key;
	void *data;
};


static LIST_HEAD(hl_drivers);
static rwlock_t hl_drivers_lock = RW_LOCK_UNLOCKED;

static LIST_HEAD(addr_space);
static rwlock_t addr_space_lock = RW_LOCK_UNLOCKED;

/* addr_space list will have zero and max already included as bounds */
static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;


static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
											struct hpsb_host *host)
{
	struct hl_host_info *hi = NULL;
	struct list_head *lh;
	
	if (!hl || !host)
		return NULL;
	
	read_lock(&hl->host_info_lock);
	list_for_each (lh, &hl->host_info_list) {
		hi = list_entry(lh, struct hl_host_info, list);
		if (hi->host == host)
			break;
		hi = NULL;
	}
	read_unlock(&hl->host_info_lock);
	
	return hi;
}


/* Returns a per host/driver data structure that was previously stored by
* hpsb_create_hostinfo. */
void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
{
	struct hl_host_info *hi = hl_get_hostinfo(hl, host);
	
	if (hi)
		return hi->data;
	
	return NULL;
}


/* If size is zero, then the return here is only valid for error checking */
void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
						   size_t data_size)
{
	struct hl_host_info *hi;
	void *data;
	unsigned long flags;
	
	hi = hl_get_hostinfo(hl, host);
	if (hi) {
		HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already exists",
			hl->name);
		return NULL;
	}
	
	hi = kmalloc(sizeof(*hi) + data_size, GFP_KERNEL);
	if (!hi)
		return NULL;
	
	memset(hi, 0, sizeof(*hi) + data_size);
	
	if (data_size) {
		data = hi->data = hi + 1;
		hi->size = data_size;
	} else
		data = hi;
	
	hi->host = host;
	
	write_lock_irqsave(&hl->host_info_lock, flags);
	list_add_tail(&hi->list, &hl->host_info_list);
	write_unlock_irqrestore(&hl->host_info_lock, flags);
	
	return data;
}


int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
					  void *data)
{
	struct hl_host_info *hi;
	
	hi = hl_get_hostinfo(hl, host);
	if (hi) {
		if (!hi->size && !hi->data) {
			hi->data = data;
			return 0;
		} else
			HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo already has data",
			hl->name);
	} else
		HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
		hl->name);
	
	return -EINVAL;
}


void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
{
	struct hl_host_info *hi;
	
	hi = hl_get_hostinfo(hl, host);
	if (hi) {
		unsigned long flags;
		write_lock_irqsave(&hl->host_info_lock, flags);
		list_del(&hi->list);
		write_unlock_irqrestore(&hl->host_info_lock, flags);
		kfree(hi);
	}
	
	return;
}


void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host, unsigned long key)
{
	struct hl_host_info *hi;
	
	hi = hl_get_hostinfo(hl, host);
	if (hi)
		hi->key = key;
	
	return;
}


unsigned long hpsb_get_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host)
{
	struct hl_host_info *hi;
	
	hi = hl_get_hostinfo(hl, host);
	if (hi)
		return hi->key;
	
	return 0;
}


void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
{
	struct list_head *lh;
	struct hl_host_info *hi;
	void *data = NULL;
	
	if (!hl)
		return NULL;
	
	read_lock(&hl->host_info_lock);
	list_for_each (lh, &hl->host_info_list) {
		hi = list_entry(lh, struct hl_host_info, list);
		if (hi->key == key) {
			data = hi->data;
			break;
		}
	}
	read_unlock(&hl->host_info_lock);
	
	return data;
}


struct hpsb_host *hpsb_get_host_bykey(struct hpsb_highlevel *hl, unsigned long key)
{
	struct list_head *lh;
	struct hl_host_info *hi;
	struct hpsb_host *host = NULL;
	
	if (!hl)
		return NULL;
	
	read_lock(&hl->host_info_lock);
	list_for_each (lh, &hl->host_info_list) {
		hi = list_entry(lh, struct hl_host_info, list);
		if (hi->key == key) {
			host = hi->host;
			break;
		}
	}
	read_unlock(&hl->host_info_lock);
	
	return host;
}


void hpsb_register_highlevel(struct hpsb_highlevel *hl)
{
	struct list_head *lh;
	unsigned long flags;
	
	INIT_LIST_HEAD(&hl->addr_list);
	INIT_LIST_HEAD(&hl->host_info_list);
	
	rwlock_init(&hl->host_info_lock);
	
	write_lock_irqsave(&hl_drivers_lock, flags);
	list_add_tail(&hl->hl_list, &hl_drivers);
	write_unlock_irqrestore(&hl_drivers_lock, flags);
	
	if (hl->add_host) {
		down(&hpsb_hosts_lock);
		list_for_each (lh, &hpsb_hosts) {
			struct hpsb_host *host = list_entry(lh, struct hpsb_host, host_list);
			hl->add_host(host);
		}
		up(&hpsb_hosts_lock);
	}
	
	return;
}

void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
{
	struct list_head *lh, *next;
	struct hpsb_address_serve *as;
	unsigned long flags;
	
	write_lock_irqsave(&addr_space_lock, flags);
	list_for_each_safe (lh, next, &hl->addr_list) {
		as = list_entry(lh, struct hpsb_address_serve, addr_list);
		list_del(&as->as_list);
		kfree(as);
	}
	write_unlock_irqrestore(&addr_space_lock, flags);
	
	write_lock_irqsave(&hl_drivers_lock, flags);
	list_del(&hl->hl_list);
	write_unlock_irqrestore(&hl_drivers_lock, flags);
	
	if (hl->remove_host) {
		down(&hpsb_hosts_lock);
		list_for_each(lh, &hpsb_hosts) {
			struct hpsb_host *host = list_entry(lh, struct hpsb_host, host_list);
			
			hl->remove_host(host);
			hpsb_destroy_hostinfo(hl, host);
		}
		up(&hpsb_hosts_lock);
	}
}

int hpsb_register_addrspace(struct hpsb_highlevel *hl,
                            struct hpsb_address_ops *ops, u64 start, u64 end)
{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	int retval = 0;
	unsigned long flags;
	
	if (((start|end) & 3) || (start >= end) || (end > 0x1000000000000ULL)) {
		HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
		return 0;
	}
	
	as = (struct hpsb_address_serve *)
		kmalloc(sizeof(struct hpsb_address_serve), GFP_KERNEL);
	if (as == NULL) {
		return 0;
	}
	
	INIT_LIST_HEAD(&as->as_list);
	INIT_LIST_HEAD(&as->addr_list);
	as->op = ops;
	as->start = start;
	as->end = end;
	
	write_lock_irqsave(&addr_space_lock, flags);
	entry = addr_space.next;
	
	while (list_entry(entry, struct hpsb_address_serve, as_list)->end
		<= start) {
		if (list_entry(entry->next, struct hpsb_address_serve, as_list)
			->start >= end) {
			list_add(&as->as_list, entry);
			list_add_tail(&as->addr_list, &hl->addr_list);
			retval = 1;
			break;
		}
		entry = entry->next;
	}
	write_unlock_irqrestore(&addr_space_lock, flags);
	
	if (retval == 0) {
		kfree(as);
	}
	
	return retval;
}

int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, u64 start)
{
	int retval = 0;
	struct hpsb_address_serve *as;
	struct list_head *entry;
	unsigned long flags;
	
	write_lock_irqsave(&addr_space_lock, flags);
	
	entry = hl->addr_list.next;
	
	while (entry != &hl->addr_list) {
		as = list_entry(entry, struct hpsb_address_serve, addr_list);
		entry = entry->next;
		if (as->start == start) {
			list_del(&as->as_list);
			list_del(&as->addr_list);
			kfree(as);
			retval = 1;
			break;
		}
	}
	
	write_unlock_irqrestore(&addr_space_lock, flags);
	
	return retval;
}

int hpsb_listen_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
						unsigned int channel)
{
	if (channel > 63) {
		HPSB_ERR("%s called with invalid channel", __FUNCTION__);
		return -EINVAL;
	}
	
	if (host->iso_listen_count[channel]++ == 0) {
		return host->driver->devctl(host, ISO_LISTEN_CHANNEL, channel);		//see ohci1394.c
	}
	
	return 0;
}

void hpsb_unlisten_channel(struct hpsb_highlevel *hl, struct hpsb_host *host, 
                           unsigned int channel)
{
	if (channel > 63) {
		HPSB_ERR("%s called with invalid channel", __FUNCTION__);
		return;
	}
	
	if (--host->iso_listen_count[channel] == 0) {
		host->driver->devctl(host, ISO_UNLISTEN_CHANNEL, channel);		//see ohci1394.c
	}
}


void highlevel_add_host(struct hpsb_host *host)
{
	struct list_head *entry;
	struct hpsb_highlevel *hl;
	
	read_lock(&hl_drivers_lock);
	list_for_each(entry, &hl_drivers) {
		hl = list_entry(entry, struct hpsb_highlevel, hl_list);
		if (hl->add_host)
			hl->add_host(host);
	}
	read_unlock(&hl_drivers_lock);
}

void highlevel_remove_host(struct hpsb_host *host)
{
	struct list_head *entry;
	struct hpsb_highlevel *hl;
	
	read_lock(&hl_drivers_lock);
	list_for_each(entry, &hl_drivers) {
		hl = list_entry(entry, struct hpsb_highlevel, hl_list);
		
		if (hl->remove_host) {
			hl->remove_host(host);
			hpsb_destroy_hostinfo(hl, host);
		}
	}
	read_unlock(&hl_drivers_lock);
}

void highlevel_host_reset(struct hpsb_host *host)
{
	struct list_head *entry;
	struct hpsb_highlevel *hl;
	
	read_lock(&hl_drivers_lock);
	list_for_each(entry, &hl_drivers) {
		hl = list_entry(entry, struct hpsb_highlevel, hl_list);
		
		if (hl->host_reset)
			hl->host_reset(host);
	}
	read_unlock(&hl_drivers_lock);
}

void highlevel_iso_receive(struct hpsb_host *host, void *data,
						   size_t length)
{
	struct list_head *entry;
	struct hpsb_highlevel *hl;
	int channel = (((quadlet_t *)data)[0] >> 8) & 0x3f;
	
	read_lock(&hl_drivers_lock);
	entry = hl_drivers.next;
	
	while (entry != &hl_drivers) {
		hl = list_entry(entry, struct hpsb_highlevel, hl_list);
		if (hl->iso_receive) {
			hl->iso_receive(host, channel, data, length);		//see raw1394.c
		}
		entry = entry->next;
	}
	read_unlock(&hl_drivers_lock);
}

void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
						   void *data, size_t length)
{
	struct list_head *entry;
	struct hpsb_highlevel *hl;
	int cts = ((quadlet_t *)data)[0] >> 4;
	
	read_lock(&hl_drivers_lock);
	entry = hl_drivers.next;
	
	while (entry != &hl_drivers) {
		hl = list_entry(entry, struct hpsb_highlevel, hl_list);
		if (hl->fcp_request) {
			hl->fcp_request(host, nodeid, direction, cts, data,			//see raw1394.c
				length);
		}
		entry = entry->next;
	}
	read_unlock(&hl_drivers_lock);
}

int highlevel_read(struct hpsb_host *host, int nodeid, void *data,
                   u64 addr, unsigned int length, u16 flags)
{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	unsigned int partlength;
	int rcode = RCODE_ADDRESS_ERROR;
	
	read_lock(&addr_space_lock);
	
	entry = addr_space.next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);
	
	while (as->start <= addr) {
		if (as->end > addr) {
			partlength = min(as->end - addr, (u64) length);
			
			if (as->op->read) {
				rcode = as->op->read(host, nodeid, data,
					addr, partlength, flags);
			} else {
				rcode = RCODE_TYPE_ERROR;
			}
			
			(u8 *)data += partlength;
			length -= partlength;
			addr += partlength;
			
			if ((rcode != RCODE_COMPLETE) || !length) {
				break;
			}
		}
		
		entry = entry->next;
		as = list_entry(entry, struct hpsb_address_serve, as_list);
	}
	
	read_unlock(&addr_space_lock);
	
	if (length && (rcode == RCODE_COMPLETE)) {
		rcode = RCODE_ADDRESS_ERROR;
	}
	
	return rcode;
}

int highlevel_write(struct hpsb_host *host, int nodeid, int destid,
					void *data, u64 addr, unsigned int length, u16 flags)
{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	unsigned int partlength;
	int rcode = RCODE_ADDRESS_ERROR;
	
	read_lock(&addr_space_lock);
	
	entry = addr_space.next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);
	
	while (as->start <= addr) {
		if (as->end > addr) {
			partlength = min(as->end - addr, (u64) length);
			
			if (as->op->write) {
				rcode = as->op->write(host, nodeid, destid,
					data, addr, partlength, flags);
			} else {
				rcode = RCODE_TYPE_ERROR;
			}
			
			(u8 *)data += partlength;
			length -= partlength;
			addr += partlength;
			
			if ((rcode != RCODE_COMPLETE) || !length) {
				break;
			}
		}
		
		entry = entry->next;
		as = list_entry(entry, struct hpsb_address_serve, as_list);
	}
	
	read_unlock(&addr_space_lock);
	
	if (length && (rcode == RCODE_COMPLETE)) {
		rcode = RCODE_ADDRESS_ERROR;
	}
	
	return rcode;
}


int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
                   u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode, u16 flags)
{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	int rcode = RCODE_ADDRESS_ERROR;
	
	read_lock(&addr_space_lock);
	
	entry = addr_space.next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);
	
	while (as->start <= addr) {
		if (as->end > addr) {
			if (as->op->lock) {
				rcode = as->op->lock(host, nodeid, store, addr,
					data, arg, ext_tcode, flags);
			} else {
				rcode = RCODE_TYPE_ERROR;
			}
			
			break;
		}
		
		entry = entry->next;
		as = list_entry(entry, struct hpsb_address_serve, as_list);
	}
	
	read_unlock(&addr_space_lock);
	
	return rcode;
}

int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
                     u64 addr, octlet_t data, octlet_t arg, int ext_tcode, u16 flags)
{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	int rcode = RCODE_ADDRESS_ERROR;
	
	read_lock(&addr_space_lock);
	
	entry = addr_space.next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);
	
	while (as->start <= addr) {
		if (as->end > addr) {
			if (as->op->lock64) {
				rcode = as->op->lock64(host, nodeid, store,
					addr, data, arg,
					ext_tcode, flags);
			} else {
				rcode = RCODE_TYPE_ERROR;
			}
			
			break;
		}
		
		entry = entry->next;
		as = list_entry(entry, struct hpsb_address_serve, as_list);
	}
	
	read_unlock(&addr_space_lock);
	
	return rcode;
}

void init_hpsb_highlevel(void)
{
	INIT_LIST_HEAD(&dummy_zero_addr.as_list);
	INIT_LIST_HEAD(&dummy_zero_addr.addr_list);
	INIT_LIST_HEAD(&dummy_max_addr.as_list);
	INIT_LIST_HEAD(&dummy_max_addr.addr_list);
	
	dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
	
	dummy_zero_addr.start = dummy_zero_addr.end = 0;
	dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
	
	list_add_tail(&dummy_zero_addr.as_list, &addr_space);
	list_add_tail(&dummy_max_addr.as_list, &addr_space);
}