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/*-
* Copyright (c) 2005 Olivier Houchard. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/xscale/i80321/i80321_dma.c 156212 2006-03-02 14:06:38Z cognet $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/md_var.h>
#include <arm/xscale/i80321/i80321reg.h>
#include <arm/xscale/i80321/i80321var.h>
#include <arm/xscale/i80321/iq80321reg.h>
#include <arm/xscale/i80321/iq80321var.h>
#include <arm/xscale/i80321/i80321_intr.h>
typedef struct i80321_dmadesc_s {
vm_paddr_t next_desc;
vm_paddr_t low_pciaddr;
vm_paddr_t high_pciaddr;
vm_paddr_t local_addr;
vm_size_t count;
uint32_t descr_ctrl;
uint64_t unused;
} __packed i80321_dmadesc_t;
typedef struct i80321_dmaring_s {
i80321_dmadesc_t *desc;
vm_paddr_t phys_addr;
bus_dmamap_t map;
} i80321_dmaring_t;
#define DMA_RING_SIZE 64
struct i80321_dma_softc {
bus_space_tag_t sc_st;
bus_space_handle_t sc_dma_sh;
bus_dma_tag_t dmatag;
i80321_dmaring_t dmaring[DMA_RING_SIZE];
int flags;
#define BUSY 0x1
int unit;
struct mtx mtx;
};
static int
i80321_dma_probe(device_t dev)
{
device_set_desc(dev, "I80321 DMA Unit");
return (0);
}
static struct i80321_dma_softc *softcs[2]; /* XXX */
static void
i80321_mapphys(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
vm_paddr_t *addr = (vm_paddr_t *)arg;
*addr = segs->ds_addr;
}
#define DMA_REG_WRITE(softc, reg, val) \
bus_space_write_4((softc)->sc_st, (softc)->sc_dma_sh, \
(reg), (val))
#define DMA_REG_READ(softc, reg) \
bus_space_read_4((softc)->sc_st, (softc)->sc_dma_sh, \
(reg))
#define DMA_CLEAN_MASK (0x2|0x4|0x8|0x20|0x100|0x200)
static int dma_memcpy(void *, void *, int, int);
static int
i80321_dma_attach(device_t dev)
{
struct i80321_dma_softc *softc = device_get_softc(dev);
struct i80321_softc *sc = device_get_softc(device_get_parent(dev));
int unit = device_get_unit(dev);
i80321_dmadesc_t *dmadescs;
mtx_init(&softc->mtx, "DMA engine mtx", NULL, MTX_SPIN);
softc->sc_st = sc->sc_st;
if (bus_space_subregion(softc->sc_st, sc->sc_sh, unit == 0 ?
VERDE_DMA_BASE0 : VERDE_DMA_BASE1, VERDE_DMA_SIZE,
&softc->sc_dma_sh) != 0)
panic("%s: unable to subregion DMA registers",
device_get_name(dev));
if (bus_dma_tag_create(NULL, sizeof(i80321_dmadesc_t),
0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
DMA_RING_SIZE * sizeof(i80321_dmadesc_t), 1,
sizeof(i80321_dmadesc_t), BUS_DMA_ALLOCNOW, busdma_lock_mutex,
&Giant, &softc->dmatag))
panic("Couldn't create a dma tag");
DMA_REG_WRITE(softc, 0, 0);
if (bus_dmamem_alloc(softc->dmatag, (void **)&dmadescs,
BUS_DMA_NOWAIT | BUS_DMA_COHERENT, &softc->dmaring[0].map))
panic("Couldn't alloc dma memory");
for (int i = 0; i < DMA_RING_SIZE; i++) {
if (i > 0)
if (bus_dmamap_create(softc->dmatag, 0,
&softc->dmaring[i].map))
panic("Couldn't alloc dmamap");
softc->dmaring[i].desc = &dmadescs[i];
bus_dmamap_load(softc->dmatag, softc->dmaring[i].map,
softc->dmaring[i].desc, sizeof(i80321_dmadesc_t),
i80321_mapphys, &softc->dmaring[i].phys_addr, 0);
}
softc->unit = unit;
softcs[unit] = softc;
_arm_memcpy = dma_memcpy;
_min_memcpy_size = 1024;
return (0);
}
static __inline int
virt_addr_is_valid(void *addr, int len, int write, int is_kernel)
{
int to_nextpage;
char tmp = 0;
while (len > 0) {
if (write) {
if (is_kernel)
*(char *)addr = 0;
else if (subyte(addr, 0) != 0) {
return (0);
}
} else {
if (is_kernel)
badaddr_read(addr, 1, &tmp);
else if (fubyte(addr) == -1) {
return (0);
}
}
to_nextpage = ((vm_offset_t)addr & ~PAGE_MASK) +
PAGE_SIZE - (vm_offset_t)addr;
if (to_nextpage >= len)
break;
len -= to_nextpage;
addr = (void *)((vm_offset_t)addr + to_nextpage);
}
return (1);
}
static int
dma_memcpy(void *dst, void *src, int len, int flags)
{
struct i80321_dma_softc *sc;
i80321_dmadesc_t *desc;
int ret;
int csr;
int descnb = 0;
int tmplen = len;
int to_nextpagesrc, to_nextpagedst;
int min_hop;
vm_paddr_t pa, pa2, tmppa;
pmap_t pmap = vmspace_pmap(curthread->td_proc->p_vmspace);
if (!softcs[0] || !softcs[1])
return (-1);
mtx_lock_spin(&softcs[0]->mtx);
if (softcs[0]->flags & BUSY) {
mtx_unlock_spin(&softcs[0]->mtx);
mtx_lock_spin(&softcs[1]->mtx);
if (softcs[1]->flags & BUSY) {
mtx_unlock(&softcs[1]->mtx);
return (-1);
}
sc = softcs[1];
} else
sc = softcs[0];
sc->flags |= BUSY;
mtx_unlock_spin(&sc->mtx);
desc = sc->dmaring[0].desc;
if (flags & IS_PHYSICAL) {
desc->next_desc = 0;
desc->low_pciaddr = (vm_paddr_t)src;
desc->high_pciaddr = 0;
desc->local_addr = (vm_paddr_t)dst;
desc->count = len;
desc->descr_ctrl = 1 << 6; /* Local memory to local memory. */
bus_dmamap_sync(sc->dmatag,
sc->dmaring[0].map,
BUS_DMASYNC_PREWRITE);
} else {
if (!virt_addr_is_valid(dst, len, 1, !(flags & DST_IS_USER)) ||
!virt_addr_is_valid(src, len, 0, !(flags & SRC_IS_USER))) {
mtx_lock_spin(&sc->mtx);
sc->flags &= ~BUSY;
mtx_unlock_spin(&sc->mtx);
return (-1);
}
cpu_dcache_wb_range((vm_offset_t)src, len);
if ((vm_offset_t)dst & (31))
cpu_dcache_wb_range((vm_offset_t)dst & ~31, 32);
if (((vm_offset_t)dst + len) & 31)
cpu_dcache_wb_range(((vm_offset_t)dst + len) & ~31,
32);
cpu_dcache_inv_range((vm_offset_t)dst, len);
while (tmplen > 0) {
pa = (flags & SRC_IS_USER) ?
pmap_extract(pmap, (vm_offset_t)src) :
vtophys(src);
pa2 = (flags & DST_IS_USER) ?
pmap_extract(pmap, (vm_offset_t)dst) :
vtophys(dst);
to_nextpagesrc = ((vm_offset_t)src & ~PAGE_MASK) +
PAGE_SIZE - (vm_offset_t)src;
to_nextpagedst = ((vm_offset_t)dst & ~PAGE_MASK) +
PAGE_SIZE - (vm_offset_t)dst;
while (to_nextpagesrc < tmplen) {
tmppa = (flags & SRC_IS_USER) ?
pmap_extract(pmap, (vm_offset_t)src +
to_nextpagesrc) :
vtophys((vm_offset_t)src +
to_nextpagesrc);
if (tmppa != pa + to_nextpagesrc)
break;
to_nextpagesrc += PAGE_SIZE;
}
while (to_nextpagedst < tmplen) {
tmppa = (flags & DST_IS_USER) ?
pmap_extract(pmap, (vm_offset_t)dst +
to_nextpagedst) :
vtophys((vm_offset_t)dst +
to_nextpagedst);
if (tmppa != pa2 + to_nextpagedst)
break;
to_nextpagedst += PAGE_SIZE;
}
min_hop = to_nextpagedst > to_nextpagesrc ?
to_nextpagesrc : to_nextpagedst;
if (min_hop < 64) {
tmplen -= min_hop;
memcpy(dst, src, min_hop);
cpu_dcache_wbinv_range((vm_offset_t)dst,
min_hop);
src = (void *)((vm_offset_t)src + min_hop);
dst = (void *)((vm_offset_t)dst + min_hop);
if (tmplen <= 0 && descnb > 0) {
sc->dmaring[descnb - 1].desc->next_desc
= 0;
bus_dmamap_sync(sc->dmatag,
sc->dmaring[descnb - 1].map,
BUS_DMASYNC_PREWRITE);
}
continue;
}
desc->low_pciaddr = pa;
desc->high_pciaddr = 0;
desc->local_addr = pa2;
desc->count = tmplen > min_hop ? min_hop : tmplen;
desc->descr_ctrl = 1 << 6;
if (min_hop < tmplen) {
tmplen -= min_hop;
src = (void *)((vm_offset_t)src + min_hop);
dst = (void *)((vm_offset_t)dst + min_hop);
} else
tmplen = 0;
if (descnb + 1 >= DMA_RING_SIZE) {
mtx_lock_spin(&sc->mtx);
sc->flags &= ~BUSY;
mtx_unlock_spin(&sc->mtx);
return (-1);
}
if (tmplen > 0) {
desc->next_desc = sc->dmaring[descnb + 1].
phys_addr;
bus_dmamap_sync(sc->dmatag,
sc->dmaring[descnb].map,
BUS_DMASYNC_PREWRITE);
desc = sc->dmaring[descnb + 1].desc;
descnb++;
} else {
desc->next_desc = 0;
bus_dmamap_sync(sc->dmatag,
sc->dmaring[descnb].map,
BUS_DMASYNC_PREWRITE);
}
}
}
DMA_REG_WRITE(sc, 4 /* Status register */,
DMA_REG_READ(sc, 4) | DMA_CLEAN_MASK);
DMA_REG_WRITE(sc, 0x10 /* Descriptor addr */,
sc->dmaring[0].phys_addr);
DMA_REG_WRITE(sc, 0 /* Control register */, 1 | 2/* Start transfer */);
while ((csr = DMA_REG_READ(sc, 0x4)) & (1 << 10));
/* Wait until it's done. */
if (csr & 0x2e) /* error */
ret = -1;
else
ret = 0;
DMA_REG_WRITE(sc, 0, 0);
mtx_lock_spin(&sc->mtx);
sc->flags &= ~BUSY;
mtx_unlock_spin(&sc->mtx);
return (ret);
}
static device_method_t i80321_dma_methods[] = {
DEVMETHOD(device_probe, i80321_dma_probe),
DEVMETHOD(device_attach, i80321_dma_attach),
{0, 0},
};
static driver_t i80321_dma_driver = {
"i80321_dma",
i80321_dma_methods,
sizeof(struct i80321_dma_softc),
};
static devclass_t i80321_dma_devclass;
DRIVER_MODULE(i80321_dma, iq, i80321_dma_driver, i80321_dma_devclass, 0, 0);