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path: root/kernel/drivers/net/fddi/skfp/hwt.c
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/******************************************************************************
 *
 *	(C)Copyright 1998,1999 SysKonnect,
 *	a business unit of Schneider & Koch & Co. Datensysteme GmbH.
 *
 *	See the file "skfddi.c" for further information.
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	The information in this file is provided "AS IS" without warranty.
 *
 ******************************************************************************/

/*
 * Timer Driver for FBI board (timer chip 82C54)
 */

/*
 * Modifications:
 *
 *	28-Jun-1994 sw	Edit v1.6.
 *			MCA: Added support for the SK-NET FDDI-FM2 adapter. The
 *			 following functions have been added(+) or modified(*):
 *			 hwt_start(*), hwt_stop(*), hwt_restart(*), hwt_read(*)
 */

#include "h/types.h"
#include "h/fddi.h"
#include "h/smc.h"

#ifndef	lint
static const char ID_sccs[] = "@(#)hwt.c	1.13 97/04/23 (C) SK " ;
#endif

/*
 * Prototypes of local functions.
 */
/* 28-Jun-1994 sw - Note: hwt_restart() is also used in module 'drvfbi.c'. */
/*static void hwt_restart() ; */

/************************
 *
 *	hwt_start
 *
 *	Start hardware timer (clock ticks are 16us).
 *
 *	void hwt_start(
 *		struct s_smc *smc,
 *		u_long time) ;
 * In
 *	smc - A pointer to the SMT Context structure.
 *
 *	time - The time in units of 16us to load the timer with.
 * Out
 *	Nothing.
 *
 ************************/
#define	HWT_MAX	(65000)

void hwt_start(struct s_smc *smc, u_long time)
{
	u_short	cnt ;

	if (time > HWT_MAX)
		time = HWT_MAX ;

	smc->hw.t_start = time ;
	smc->hw.t_stop = 0L ;

	cnt = (u_short)time ;
	/*
	 * if time < 16 us
	 *	time = 16 us
	 */
	if (!cnt)
		cnt++ ;

	outpd(ADDR(B2_TI_INI), (u_long) cnt * 200) ;	/* Load timer value. */
	outpw(ADDR(B2_TI_CRTL), TIM_START) ;		/* Start timer. */

	smc->hw.timer_activ = TRUE ;
}

/************************
 *
 *	hwt_stop
 *
 *	Stop hardware timer.
 *
 *	void hwt_stop(
 *		struct s_smc *smc) ;
 * In
 *	smc - A pointer to the SMT Context structure.
 * Out
 *	Nothing.
 *
 ************************/
void hwt_stop(struct s_smc *smc)
{
	outpw(ADDR(B2_TI_CRTL), TIM_STOP) ;
	outpw(ADDR(B2_TI_CRTL), TIM_CL_IRQ) ;

	smc->hw.timer_activ = FALSE ;
}

/************************
 *
 *	hwt_init
 *
 *	Initialize hardware timer.
 *
 *	void hwt_init(
 *		struct s_smc *smc) ;
 * In
 *	smc - A pointer to the SMT Context structure.
 * Out
 *	Nothing.
 *
 ************************/
void hwt_init(struct s_smc *smc)
{
	smc->hw.t_start = 0 ;
	smc->hw.t_stop	= 0 ;
	smc->hw.timer_activ = FALSE ;

	hwt_restart(smc) ;
}

/************************
 *
 *	hwt_restart
 *
 *	Clear timer interrupt.
 *
 *	void hwt_restart(
 *		struct s_smc *smc) ;
 * In
 *	smc - A pointer to the SMT Context structure.
 * Out
 *	Nothing.
 *
 ************************/
void hwt_restart(struct s_smc *smc)
{
	hwt_stop(smc) ;
}

/************************
 *
 *	hwt_read
 *
 *	Stop hardware timer and read time elapsed since last start.
 *
 *	u_long hwt_read(smc) ;
 * In
 *	smc - A pointer to the SMT Context structure.
 * Out
 *	The elapsed time since last start in units of 16us.
 *
 ************************/
u_long hwt_read(struct s_smc *smc)
{
	u_short	tr ;
	u_long	is ;

	if (smc->hw.timer_activ) {
		hwt_stop(smc) ;
		tr = (u_short)((inpd(ADDR(B2_TI_VAL))/200) & 0xffff) ;

		is = GET_ISR() ;
		/* Check if timer expired (or wraparound). */
		if ((tr > smc->hw.t_start) || (is & IS_TIMINT)) {
			hwt_restart(smc) ;
			smc->hw.t_stop = smc->hw.t_start ;
		}
		else
			smc->hw.t_stop = smc->hw.t_start - tr ;
	}
	return smc->hw.t_stop;
}

#ifdef	PCI
/************************
 *
 *	hwt_quick_read
 *
 *	Stop hardware timer and read timer value and start the timer again.
 *
 *	u_long hwt_read(smc) ;
 * In
 *	smc - A pointer to the SMT Context structure.
 * Out
 *	current timer value in units of 80ns.
 *
 ************************/
u_long hwt_quick_read(struct s_smc *smc)
{
	u_long interval ;
	u_long time ;

	interval = inpd(ADDR(B2_TI_INI)) ;
	outpw(ADDR(B2_TI_CRTL), TIM_STOP) ;
	time = inpd(ADDR(B2_TI_VAL)) ;
	outpd(ADDR(B2_TI_INI),time) ;
	outpw(ADDR(B2_TI_CRTL), TIM_START) ;
	outpd(ADDR(B2_TI_INI),interval) ;

	return time;
}

/************************
 *
 *	hwt_wait_time(smc,start,duration)
 *
 *	This function returnes after the amount of time is elapsed
 *	since the start time.
 * 
 * para	start		start time
 *	duration	time to wait
 *
 * NOTE: The function will return immediately, if the timer is not
 *	 started
 ************************/
void hwt_wait_time(struct s_smc *smc, u_long start, long int duration)
{
	long	diff ;
	long	interval ;
	int	wrapped ;

	/*
	 * check if timer is running
	 */
	if (smc->hw.timer_activ == FALSE ||
		hwt_quick_read(smc) == hwt_quick_read(smc)) {
		return ;
	}

	interval = inpd(ADDR(B2_TI_INI)) ;
	if (interval > duration) {
		do {
			diff = (long)(start - hwt_quick_read(smc)) ;
			if (diff < 0) {
				diff += interval ;
			}
		} while (diff <= duration) ;
	}
	else {
		diff = interval ;
		wrapped = 0 ;
		do {
			if (!wrapped) {
				if (hwt_quick_read(smc) >= start) {
					diff += interval ;
					wrapped = 1 ;
				}
			}
			else {
				if (hwt_quick_read(smc) < start) {
					wrapped = 0 ;
				}
			}
		} while (diff <= duration) ;
	}
}
#endif
n class="n">offset); walk->entrylen -= nbytes; return nbytes; } if (walk->flags & CRYPTO_ALG_ASYNC) kunmap(walk->pg); else { kunmap_atomic(walk->data); /* * The may sleep test only makes sense for sync users. * Async users don't need to sleep here anyway. */ crypto_yield(walk->flags); } if (err) return err; if (nbytes) { walk->offset = 0; walk->pg++; return hash_walk_next(walk); } if (!walk->total) return 0; walk->sg = sg_next(walk->sg); return hash_walk_new_entry(walk); } EXPORT_SYMBOL_GPL(crypto_hash_walk_done); int crypto_hash_walk_first(struct ahash_request *req, struct crypto_hash_walk *walk) { walk->total = req->nbytes; if (!walk->total) { walk->entrylen = 0; return 0; } walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); walk->sg = req->src; walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; return hash_walk_new_entry(walk); } EXPORT_SYMBOL_GPL(crypto_hash_walk_first); int crypto_ahash_walk_first(struct ahash_request *req, struct crypto_hash_walk *walk) { walk->total = req->nbytes; if (!walk->total) { walk->entrylen = 0; return 0; } walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); walk->sg = req->src; walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; walk->flags |= CRYPTO_ALG_ASYNC; BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC); return hash_walk_new_entry(walk); } EXPORT_SYMBOL_GPL(crypto_ahash_walk_first); int crypto_hash_walk_first_compat(struct hash_desc *hdesc, struct crypto_hash_walk *walk, struct scatterlist *sg, unsigned int len) { walk->total = len; if (!walk->total) { walk->entrylen = 0; return 0; } walk->alignmask = crypto_hash_alignmask(hdesc->tfm); walk->sg = sg; walk->flags = hdesc->flags & CRYPTO_TFM_REQ_MASK; return hash_walk_new_entry(walk); } static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, unsigned int keylen) { unsigned long alignmask = crypto_ahash_alignmask(tfm); int ret; u8 *buffer, *alignbuffer; unsigned long absize; absize = keylen + alignmask; buffer = kmalloc(absize, GFP_KERNEL); if (!buffer) return -ENOMEM; alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); memcpy(alignbuffer, key, keylen); ret = tfm->setkey(tfm, alignbuffer, keylen); kzfree(buffer); return ret; } int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, unsigned int keylen) { unsigned long alignmask = crypto_ahash_alignmask(tfm); if ((unsigned long)key & alignmask) return ahash_setkey_unaligned(tfm, key, keylen); return tfm->setkey(tfm, key, keylen); } EXPORT_SYMBOL_GPL(crypto_ahash_setkey); static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, unsigned int keylen) { return -ENOSYS; } static inline unsigned int ahash_align_buffer_size(unsigned len, unsigned long mask) { return len + (mask & ~(crypto_tfm_ctx_alignment() - 1)); } static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt) { struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); unsigned long alignmask = crypto_ahash_alignmask(tfm); unsigned int ds = crypto_ahash_digestsize(tfm); struct ahash_request_priv *priv; priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC); if (!priv) return -ENOMEM; /* * WARNING: Voodoo programming below! * * The code below is obscure and hard to understand, thus explanation * is necessary. See include/crypto/hash.h and include/linux/crypto.h * to understand the layout of structures used here! * * The code here will replace portions of the ORIGINAL request with * pointers to new code and buffers so the hashing operation can store * the result in aligned buffer. We will call the modified request * an ADJUSTED request. * * The newly mangled request will look as such: * * req { * .result = ADJUSTED[new aligned buffer] * .base.complete = ADJUSTED[pointer to completion function] * .base.data = ADJUSTED[*req (pointer to self)] * .priv = ADJUSTED[new priv] { * .result = ORIGINAL(result) * .complete = ORIGINAL(base.complete) * .data = ORIGINAL(base.data) * } */ priv->result = req->result; priv->complete = req->base.complete; priv->data = req->base.data; /* * WARNING: We do not backup req->priv here! The req->priv * is for internal use of the Crypto API and the * user must _NOT_ _EVER_ depend on it's content! */ req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); req->base.complete = cplt; req->base.data = req; req->priv = priv; return 0; } static void ahash_restore_req(struct ahash_request *req) { struct ahash_request_priv *priv = req->priv; /* Restore the original crypto request. */ req->result = priv->result; req->base.complete = priv->complete; req->base.data = priv->data; req->priv = NULL; /* Free the req->priv.priv from the ADJUSTED request. */ kzfree(priv); } static void ahash_op_unaligned_finish(struct ahash_request *req, int err) { struct ahash_request_priv *priv = req->priv; if (err == -EINPROGRESS) return; if (!err) memcpy(priv->result, req->result, crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); ahash_restore_req(req); } static void ahash_op_unaligned_done(struct crypto_async_request *req, int err) { struct ahash_request *areq = req->data; /* * Restore the original request, see ahash_op_unaligned() for what * goes where. * * The "struct ahash_request *req" here is in fact the "req.base" * from the ADJUSTED request from ahash_op_unaligned(), thus as it * is a pointer to self, it is also the ADJUSTED "req" . */ /* First copy req->result into req->priv.result */ ahash_op_unaligned_finish(areq, err); /* Complete the ORIGINAL request. */ areq->base.complete(&areq->base, err); } static int ahash_op_unaligned(struct ahash_request *req, int (*op)(struct ahash_request *)) { int err; err = ahash_save_req(req, ahash_op_unaligned_done); if (err) return err; err = op(req); ahash_op_unaligned_finish(req, err); return err; } static int crypto_ahash_op(struct ahash_request *req, int (*op)(struct ahash_request *)) { struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); unsigned long alignmask = crypto_ahash_alignmask(tfm); if ((unsigned long)req->result & alignmask) return ahash_op_unaligned(req, op); return op(req); } int crypto_ahash_final(struct ahash_request *req) { return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final); } EXPORT_SYMBOL_GPL(crypto_ahash_final); int crypto_ahash_finup(struct ahash_request *req) { return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup); } EXPORT_SYMBOL_GPL(crypto_ahash_finup); int crypto_ahash_digest(struct ahash_request *req) { return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest); } EXPORT_SYMBOL_GPL(crypto_ahash_digest); static void ahash_def_finup_finish2(struct ahash_request *req, int err) { struct ahash_request_priv *priv = req->priv; if (err == -EINPROGRESS) return; if (!err) memcpy(priv->result, req->result, crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); ahash_restore_req(req); } static void ahash_def_finup_done2(struct crypto_async_request *req, int err) { struct ahash_request *areq = req->data; ahash_def_finup_finish2(areq, err); areq->base.complete(&areq->base, err); } static int ahash_def_finup_finish1(struct ahash_request *req, int err) { if (err) goto out; req->base.complete = ahash_def_finup_done2; req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; err = crypto_ahash_reqtfm(req)->final(req); out: ahash_def_finup_finish2(req, err); return err; } static void ahash_def_finup_done1(struct crypto_async_request *req, int err) { struct ahash_request *areq = req->data; err = ahash_def_finup_finish1(areq, err); areq->base.complete(&areq->base, err); } static int ahash_def_finup(struct ahash_request *req) { struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); int err; err = ahash_save_req(req, ahash_def_finup_done1); if (err) return err; err = tfm->update(req); return ahash_def_finup_finish1(req, err); } static int ahash_no_export(struct ahash_request *req, void *out) { return -ENOSYS; } static int ahash_no_import(struct ahash_request *req, const void *in) { return -ENOSYS; } static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) { struct crypto_ahash *hash = __crypto_ahash_cast(tfm); struct ahash_alg *alg = crypto_ahash_alg(hash); hash->setkey = ahash_nosetkey; hash->has_setkey = false; hash->export = ahash_no_export; hash->import = ahash_no_import; if (tfm->__crt_alg->cra_type != &crypto_ahash_type) return crypto_init_shash_ops_async(tfm); hash->init = alg->init; hash->update = alg->update; hash->final = alg->final; hash->finup = alg->finup ?: ahash_def_finup; hash->digest = alg->digest; if (alg->setkey) { hash->setkey = alg->setkey; hash->has_setkey = true; } if (alg->export) hash->export = alg->export; if (alg->import) hash->import = alg->import; return 0; } static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) { if (alg->cra_type == &crypto_ahash_type) return alg->cra_ctxsize; return sizeof(struct crypto_shash *); } #ifdef CONFIG_NET static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_hash rhash; strncpy(rhash.type, "ahash", sizeof(rhash.type)); rhash.blocksize = alg->cra_blocksize; rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize; if (nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(struct crypto_report_hash), &rhash)) goto nla_put_failure; return 0; nla_put_failure: return -EMSGSIZE; } #else static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) { return -ENOSYS; } #endif static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) __attribute__ ((unused)); static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) { seq_printf(m, "type : ahash\n"); seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); seq_printf(m, "digestsize : %u\n", __crypto_hash_alg_common(alg)->digestsize); } const struct crypto_type crypto_ahash_type = { .extsize = crypto_ahash_extsize, .init_tfm = crypto_ahash_init_tfm, #ifdef CONFIG_PROC_FS .show = crypto_ahash_show, #endif .report = crypto_ahash_report, .maskclear = ~CRYPTO_ALG_TYPE_MASK, .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, .type = CRYPTO_ALG_TYPE_AHASH, .tfmsize = offsetof(struct crypto_ahash, base), }; EXPORT_SYMBOL_GPL(crypto_ahash_type); struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, u32 mask) { return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); } EXPORT_SYMBOL_GPL(crypto_alloc_ahash); static int ahash_prepare_alg(struct ahash_alg *alg) { struct crypto_alg *base = &alg->halg.base; if (alg->halg.digestsize > PAGE_SIZE / 8 || alg->halg.statesize > PAGE_SIZE / 8 || alg->halg.statesize == 0) return -EINVAL; base->cra_type = &crypto_ahash_type; base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; return 0; } int crypto_register_ahash(struct ahash_alg *alg) { struct crypto_alg *base = &alg->halg.base; int err; err = ahash_prepare_alg(alg); if (err) return err; return crypto_register_alg(base); } EXPORT_SYMBOL_GPL(crypto_register_ahash); int crypto_unregister_ahash(struct ahash_alg *alg) { return crypto_unregister_alg(&alg->halg.base); } EXPORT_SYMBOL_GPL(crypto_unregister_ahash); int ahash_register_instance(struct crypto_template *tmpl, struct ahash_instance *inst) { int err; err = ahash_prepare_alg(&inst->alg); if (err) return err; return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); } EXPORT_SYMBOL_GPL(ahash_register_instance); void ahash_free_instance(struct crypto_instance *inst) { crypto_drop_spawn(crypto_instance_ctx(inst)); kfree(ahash_instance(inst)); } EXPORT_SYMBOL_GPL(ahash_free_instance); int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn, struct hash_alg_common *alg, struct crypto_instance *inst) { return crypto_init_spawn2(&spawn->base, &alg->base, inst, &crypto_ahash_type); } EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn); struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask) { struct crypto_alg *alg; alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask); return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg); } EXPORT_SYMBOL_GPL(ahash_attr_alg); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Asynchronous cryptographic hash type");