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/* $OpenBSD: dma.c,v 1.2 2014/07/12 18:44:41 tedu Exp $ */
/*
* Copyright (c) 2013 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <uvm/uvm.h>
#include <machine/autoconf.h>
#include <machine/board.h>
#include <aviion/dev/sysconvar.h>
#include <aviion/dev/dmareg.h>
#include <aviion/dev/dmavar.h>
/*
* DMA request information structure.
*/
struct dmareq {
TAILQ_ENTRY(dmareq) chain;
vaddr_t mem;
size_t len;
uint dir;
size_t lastcnt;
void *cbarg;
void (*cbstart)(void *);
void (*cbdone)(void *);
};
struct dma_softc {
struct device sc_dev;
struct intrhand sc_ih;
TAILQ_HEAD(, dmareq) sc_req;
};
int dma_match(struct device *, void *, void *);
void dma_attach(struct device *, struct device *, void *);
const struct cfattach dma_ca = {
sizeof(struct dma_softc), dma_match, dma_attach
};
struct cfdriver dma_cd = {
NULL, "dma", DV_DULL
};
int dma_intr(void *);
void dma_start(struct dma_softc *);
int
dma_match(struct device *parent, void *match, void *aux)
{
struct confargs *ca = aux;
switch (cpuid) {
#ifdef AV400
case AVIION_300_310:
case AVIION_400_4000:
case AVIION_410_4100:
case AVIION_300C_310C:
case AVIION_300CD_310CD:
case AVIION_300D_310D:
case AVIION_4300_25:
case AVIION_4300_20:
case AVIION_4300_16:
if (ca->ca_paddr == DMA_MAP)
return 1;
/* FALLTHROUGH */
#endif
default:
return 0;
}
}
void
dma_attach(struct device *parent, struct device *self, void *aux)
{
struct dma_softc *sc = (struct dma_softc *)self;
printf("\n");
*(volatile uint32_t *)DMA_COUNT = 0; /* clear possibly pending int */
TAILQ_INIT(&sc->sc_req);
sc->sc_ih.ih_fn = dma_intr;
sc->sc_ih.ih_arg = sc;
sc->sc_ih.ih_flags = 0;
sc->sc_ih.ih_ipl = IPL_BIO;
sysconintr_establish(INTSRC_DMA, &sc->sc_ih, self->dv_xname);
}
int
dma_intr(void *v)
{
struct dma_softc *sc = v;
struct dmareq *req;
size_t tc;
req = TAILQ_FIRST(&sc->sc_req);
if (req == NULL) {
printf("%s: interrupt but no active request?\n", __func__);
*(volatile uint32_t *)DMA_STOP = DMASTOP_INHIBIT;
return -1;
}
tc = *(volatile uint32_t *)DMA_COUNT;
if (tc != 0)
printf("%s: unexpected intr, TC = %x\n", __func__, tc);
req->len -= req->lastcnt;
if (req->len == 0) {
/* this transfer is over */
TAILQ_REMOVE(&sc->sc_req, req, chain);
if (req->cbdone != NULL)
(*req->cbdone)(req->cbarg);
free(req, M_DEVBUF, 0);
} else {
req->mem += req->lastcnt;
}
dma_start(sc);
return 1;
}
int
dma_req(void *vaddr, size_t sz, int dir, void (*cbstart)(void *),
void (*cbdone)(void *), void *cbarg)
{
struct dma_softc *sc;
struct dmareq *req;
int run;
int s;
if (dma_cd.cd_devs == NULL ||
(sc = (struct dma_softc *)dma_cd.cd_devs[0]) == NULL)
return ENXIO;
req = malloc(sizeof *req, M_DEVBUF, M_NOWAIT | M_CANFAIL);
if (req == NULL)
return ENOMEM;
req->mem = (vaddr_t)vaddr;
req->len = sz;
req->dir = dir;
req->cbstart = cbstart;
req->cbdone = cbdone;
req->cbarg = cbarg;
req->lastcnt = 0;
s = splbio();
run = TAILQ_EMPTY(&sc->sc_req);
TAILQ_INSERT_TAIL(&sc->sc_req, req, chain);
if (run)
dma_start(sc);
splx(s);
return 0;
}
void
dma_start(struct dma_softc *sc)
{
struct dmareq *req;
paddr_t pa, paoff;
req = TAILQ_FIRST(&sc->sc_req);
if (req == NULL) {
*(volatile uint32_t *)DMA_STOP = DMASTOP_INHIBIT;
return;
}
if (pmap_extract(pmap_kernel(), req->mem, &pa) == FALSE)
panic("%s: pmap_extract(%p) failed",
__func__, (void *)req->mem);
paoff = pa & ~DMAMAP_MASK;
req->lastcnt = DMA_BOUNDARY - paoff;
if (req->lastcnt > req->len)
req->lastcnt = req->len;
*(volatile uint32_t *)DMA_DIR = req->dir;
*(volatile uint32_t *)DMA_COUNT = req->lastcnt;
*(volatile uint32_t *)DMA_OFF = paoff;
*(volatile uint32_t *)DMA_MAP = (pa & DMAMAP_MASK) |
DMAMAP_G | DMAMAP_V;
*(volatile uint32_t *)DMA_CLR_INVALID = DMACLR;
*(volatile uint32_t *)DMA_STOP = DMASTOP_RESTART;
if (req->cbstart != NULL)
(*req->cbstart)(req->cbarg);
}
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