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| Current File : //compat/linux/proc/self/root/usr/src/sys/arm/xscale/i80321/i80321_aau.c |
/*-
* 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_aau.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_aaudesc_s {
vm_paddr_t next_desc;
uint32_t sar[4];
vm_paddr_t local_addr;
vm_size_t count;
uint32_t descr_ctrl;
} __packed i80321_aaudesc_t;
typedef struct i80321_aauring_s {
i80321_aaudesc_t *desc;
vm_paddr_t phys_addr;
bus_dmamap_t map;
} i80321_aauring_t;
#define AAU_RING_SIZE 64
struct i80321_aau_softc {
bus_space_tag_t sc_st;
bus_space_handle_t sc_aau_sh;
bus_dma_tag_t dmatag;
i80321_aauring_t aauring[AAU_RING_SIZE];
int flags;
#define BUSY 0x1
int unit;
struct mtx mtx;
};
static int
i80321_aau_probe(device_t dev)
{
device_set_desc(dev, "I80321 AAU");
return (0);
}
static struct i80321_aau_softc *aau_softc;
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 AAU_REG_WRITE(softc, reg, val) \
bus_space_write_4((softc)->sc_st, (softc)->sc_aau_sh, \
(reg), (val))
#define AAU_REG_READ(softc, reg) \
bus_space_read_4((softc)->sc_st, (softc)->sc_aau_sh, \
(reg))
static int aau_bzero(void *, int, int);
static int
i80321_aau_attach(device_t dev)
{
struct i80321_aau_softc *softc = device_get_softc(dev);
struct i80321_softc *sc = device_get_softc(device_get_parent(dev));
struct i80321_aaudesc_s *aaudescs;
mtx_init(&softc->mtx, "AAU mtx", NULL, MTX_SPIN);
softc->sc_st = sc->sc_st;
if (bus_space_subregion(softc->sc_st, sc->sc_sh, VERDE_AAU_BASE,
VERDE_AAU_SIZE, &softc->sc_aau_sh) != 0)
panic("%s: unable to subregion AAU registers",
device_get_name(dev));
if (bus_dma_tag_create(NULL, sizeof(i80321_aaudesc_t), 0,
BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
AAU_RING_SIZE * sizeof(i80321_aaudesc_t),
1, sizeof(i80321_aaudesc_t), BUS_DMA_ALLOCNOW, busdma_lock_mutex,
&Giant, &softc->dmatag))
panic("Couldn't create a dma tag");
if (bus_dmamem_alloc(softc->dmatag, (void **)&aaudescs,
BUS_DMA_NOWAIT | BUS_DMA_COHERENT, &softc->aauring[0].map))
panic("Couldn't alloc dma memory");
for (int i = 0; i < AAU_RING_SIZE; i++) {
if (i > 0)
if (bus_dmamap_create(softc->dmatag, 0,
&softc->aauring[i].map))
panic("Couldn't create dma map");
softc->aauring[i].desc = &aaudescs[i];
bus_dmamap_load(softc->dmatag, softc->aauring[i].map,
softc->aauring[i].desc, sizeof(i80321_aaudesc_t),
i80321_mapphys, &softc->aauring[i].phys_addr, 0);
bzero(softc->aauring[i].desc, sizeof(i80321_aaudesc_t));
}
aau_softc = softc;
_arm_bzero = aau_bzero;
_min_bzero_size = 1024;
return (0);
}
static __inline void
test_virt_addr(void *addr, int len)
{
int to_nextpage;
while (len > 0) {
*(char *)addr = 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);
}
}
static int
aau_bzero(void *dst, int len, int flags)
{
struct i80321_aau_softc *sc = aau_softc;
i80321_aaudesc_t *desc;
int ret;
int csr;
int descnb = 0;
int tmplen = len;
int to_nextpagedst;
int min_hop;
vm_paddr_t pa, tmppa;
if (!sc)
return (-1);
mtx_lock_spin(&sc->mtx);
if (sc->flags & BUSY) {
mtx_unlock_spin(&sc->mtx);
return (-1);
}
sc->flags |= BUSY;
mtx_unlock_spin(&sc->mtx);
desc = sc->aauring[0].desc;
if (flags & IS_PHYSICAL) {
desc->local_addr = (vm_paddr_t)dst;
desc->next_desc = 0;
desc->count = len;
desc->descr_ctrl = 2 << 1 | 1 << 31; /* Fill, enable dest write */
bus_dmamap_sync(sc->dmatag, sc->aauring[0].map,
BUS_DMASYNC_PREWRITE);
} else {
test_virt_addr(dst, 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 = vtophys(dst);
to_nextpagedst = ((vm_offset_t)dst & ~PAGE_MASK) +
PAGE_SIZE - (vm_offset_t)dst;
while (to_nextpagedst < tmplen) {
tmppa = vtophys((vm_offset_t)dst +
to_nextpagedst);
if (tmppa != pa + to_nextpagedst)
break;
to_nextpagedst += PAGE_SIZE;
}
min_hop = to_nextpagedst;
if (min_hop < 64) {
tmplen -= min_hop;
bzero(dst, min_hop);
cpu_dcache_wbinv_range((vm_offset_t)dst,
min_hop);
dst = (void *)((vm_offset_t)dst + min_hop);
if (tmplen <= 0 && descnb > 0) {
sc->aauring[descnb - 1].desc->next_desc
= 0;
bus_dmamap_sync(sc->dmatag,
sc->aauring[descnb - 1].map,
BUS_DMASYNC_PREWRITE);
}
continue;
}
desc->local_addr = pa;
desc->count = tmplen > min_hop ? min_hop : tmplen;
desc->descr_ctrl = 2 << 1 | 1 << 31; /* Fill, enable dest write */;
if (min_hop < tmplen) {
tmplen -= min_hop;
dst = (void *)((vm_offset_t)dst + min_hop);
} else
tmplen = 0;
if (descnb + 1 >= AAU_RING_SIZE) {
mtx_lock_spin(&sc->mtx);
sc->flags &= ~BUSY;
mtx_unlock_spin(&sc->mtx);
return (-1);
}
if (tmplen > 0) {
desc->next_desc = sc->aauring[descnb + 1].
phys_addr;
bus_dmamap_sync(sc->dmatag,
sc->aauring[descnb].map,
BUS_DMASYNC_PREWRITE);
desc = sc->aauring[descnb + 1].desc;
descnb++;
} else {
desc->next_desc = 0;
bus_dmamap_sync(sc->dmatag,
sc->aauring[descnb].map,
BUS_DMASYNC_PREWRITE);
}
}
}
AAU_REG_WRITE(sc, 0x0c /* Descriptor addr */,
sc->aauring[0].phys_addr);
AAU_REG_WRITE(sc, 0 /* Control register */, 1 << 0/* Start transfer */);
while ((csr = AAU_REG_READ(sc, 0x4)) & (1 << 10));
/* Wait until it's done. */
if (csr & (1 << 5)) /* error */
ret = -1;
else
ret = 0;
/* Clear the interrupt. */
AAU_REG_WRITE(sc, 0x4, csr);
/* Stop the AAU. */
AAU_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_aau_methods[] = {
DEVMETHOD(device_probe, i80321_aau_probe),
DEVMETHOD(device_attach, i80321_aau_attach),
{0, 0},
};
static driver_t i80321_aau_driver = {
"i80321_aau",
i80321_aau_methods,
sizeof(struct i80321_aau_softc),
};
static devclass_t i80321_aau_devclass;
DRIVER_MODULE(i80321_aau, iq, i80321_aau_driver, i80321_aau_devclass, 0, 0);