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mirror of https://git.FreeBSD.org/src.git synced 2024-12-24 11:29:10 +00:00

Add driver for Altera SoftDMA® device.

SoftDMA is a software implementation of DMA engine built using Altera
FIFO component.

Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D9620
This commit is contained in:
Ruslan Bukin 2018-04-13 14:18:04 +00:00
parent 80b5058dcc
commit 8f89e7db08
Notes: svn2git 2020-12-20 02:59:44 +00:00
svn path=/head/; revision=332472
4 changed files with 866 additions and 1 deletions

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@ -837,6 +837,7 @@ dev/altera/sdcard/altera_sdcard_disk.c optional altera_sdcard
dev/altera/sdcard/altera_sdcard_io.c optional altera_sdcard
dev/altera/sdcard/altera_sdcard_fdt.c optional altera_sdcard fdt
dev/altera/sdcard/altera_sdcard_nexus.c optional altera_sdcard
dev/altera/softdma/softdma.c optional altera_softdma xdma fdt
dev/altera/pio/pio.c optional altera_pio
dev/altera/pio/pio_if.m optional altera_pio
dev/amdpm/amdpm.c optional amdpm pci | nfpm pci

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@ -88,7 +88,7 @@ __FBSDID("$FreeBSD$");
#include <dev/mii/miivar.h>
#include <dev/altera/atse/if_atsereg.h>
#include <dev/altera/atse/a_api.h>
#include <dev/altera/softdma/a_api.h>
MODULE_DEPEND(atse, ether, 1, 1, 1);
MODULE_DEPEND(atse, miibus, 1, 1, 1);

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@ -0,0 +1,864 @@
/*-
* Copyright (c) 2017-2018 Ruslan Bukin <br@bsdpad.com>
* All rights reserved.
*
* This software was developed by SRI International and the University of
* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
* ("CTSRD"), as part of the DARPA CRASH research programme.
*
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
/* This is driver for SoftDMA device built using Altera FIFO component. */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_platform.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <machine/bus.h>
#ifdef FDT
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#endif
#include <dev/altera/softdma/a_api.h>
#include <dev/xdma/xdma.h>
#include "xdma_if.h"
#define SOFTDMA_DEBUG
#undef SOFTDMA_DEBUG
#ifdef SOFTDMA_DEBUG
#define dprintf(fmt, ...) printf(fmt, ##__VA_ARGS__)
#else
#define dprintf(fmt, ...)
#endif
#define AVALON_FIFO_TX_BASIC_OPTS_DEPTH 16
#define SOFTDMA_NCHANNELS 1
#define CONTROL_GEN_SOP (1 << 0)
#define CONTROL_GEN_EOP (1 << 1)
#define CONTROL_OWN (1 << 31)
#define SOFTDMA_RX_EVENTS \
(A_ONCHIP_FIFO_MEM_CORE_INTR_FULL | \
A_ONCHIP_FIFO_MEM_CORE_INTR_OVERFLOW | \
A_ONCHIP_FIFO_MEM_CORE_INTR_UNDERFLOW)
#define SOFTDMA_TX_EVENTS \
(A_ONCHIP_FIFO_MEM_CORE_INTR_EMPTY | \
A_ONCHIP_FIFO_MEM_CORE_INTR_OVERFLOW | \
A_ONCHIP_FIFO_MEM_CORE_INTR_UNDERFLOW)
struct softdma_channel {
struct softdma_softc *sc;
struct mtx mtx;
xdma_channel_t *xchan;
struct proc *p;
int used;
int index;
int run;
uint32_t idx_tail;
uint32_t idx_head;
struct softdma_desc *descs;
uint32_t descs_num;
uint32_t descs_used_count;
};
struct softdma_desc {
uint64_t src_addr;
uint64_t dst_addr;
uint32_t len;
uint32_t access_width;
uint32_t count;
uint16_t src_incr;
uint16_t dst_incr;
uint32_t direction;
struct softdma_desc *next;
uint32_t transfered;
uint32_t status;
uint32_t reserved;
uint32_t control;
};
struct softdma_softc {
device_t dev;
struct resource *res[3];
bus_space_tag_t bst;
bus_space_handle_t bsh;
bus_space_tag_t bst_c;
bus_space_handle_t bsh_c;
void *ih;
struct softdma_channel channels[SOFTDMA_NCHANNELS];
};
static struct resource_spec softdma_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* fifo */
{ SYS_RES_MEMORY, 1, RF_ACTIVE }, /* core */
{ SYS_RES_IRQ, 0, RF_ACTIVE },
{ -1, 0 }
};
static int softdma_probe(device_t dev);
static int softdma_attach(device_t dev);
static int softdma_detach(device_t dev);
static inline uint32_t
softdma_next_desc(struct softdma_channel *chan, uint32_t curidx)
{
return ((curidx + 1) % chan->descs_num);
}
static void
softdma_mem_write(struct softdma_softc *sc, uint32_t reg, uint32_t val)
{
bus_write_4(sc->res[0], reg, htole32(val));
}
static uint32_t
softdma_mem_read(struct softdma_softc *sc, uint32_t reg)
{
uint32_t val;
val = bus_read_4(sc->res[0], reg);
return (le32toh(val));
}
static void
softdma_memc_write(struct softdma_softc *sc, uint32_t reg, uint32_t val)
{
bus_write_4(sc->res[1], reg, htole32(val));
}
static uint32_t
softdma_memc_read(struct softdma_softc *sc, uint32_t reg)
{
uint32_t val;
val = bus_read_4(sc->res[1], reg);
return (le32toh(val));
}
static uint32_t
softdma_fill_level(struct softdma_softc *sc)
{
uint32_t val;
val = softdma_memc_read(sc,
A_ONCHIP_FIFO_MEM_CORE_STATUS_REG_FILL_LEVEL);
return (val);
}
static void
softdma_intr(void *arg)
{
struct softdma_channel *chan;
struct softdma_softc *sc;
int reg;
int err;
sc = arg;
chan = &sc->channels[0];
reg = softdma_memc_read(sc, A_ONCHIP_FIFO_MEM_CORE_STATUS_REG_EVENT);
if (reg & (A_ONCHIP_FIFO_MEM_CORE_EVENT_OVERFLOW |
A_ONCHIP_FIFO_MEM_CORE_EVENT_UNDERFLOW)) {
/* Errors */
err = (((reg & A_ONCHIP_FIFO_MEM_CORE_ERROR_MASK) >> \
A_ONCHIP_FIFO_MEM_CORE_ERROR_SHIFT) & 0xff);
}
if (reg != 0) {
softdma_memc_write(sc,
A_ONCHIP_FIFO_MEM_CORE_STATUS_REG_EVENT, reg);
chan->run = 1;
wakeup(chan);
}
}
static int
softdma_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "altr,softdma"))
return (ENXIO);
device_set_desc(dev, "SoftDMA");
return (BUS_PROBE_DEFAULT);
}
static int
softdma_attach(device_t dev)
{
struct softdma_softc *sc;
phandle_t xref, node;
int err;
sc = device_get_softc(dev);
sc->dev = dev;
if (bus_alloc_resources(dev, softdma_spec, sc->res)) {
device_printf(dev,
"could not allocate resources for device\n");
return (ENXIO);
}
/* FIFO memory interface */
sc->bst = rman_get_bustag(sc->res[0]);
sc->bsh = rman_get_bushandle(sc->res[0]);
/* FIFO control memory interface */
sc->bst_c = rman_get_bustag(sc->res[1]);
sc->bsh_c = rman_get_bushandle(sc->res[1]);
/* Setup interrupt handler */
err = bus_setup_intr(dev, sc->res[2], INTR_TYPE_MISC | INTR_MPSAFE,
NULL, softdma_intr, sc, &sc->ih);
if (err) {
device_printf(dev, "Unable to alloc interrupt resource.\n");
return (ENXIO);
}
node = ofw_bus_get_node(dev);
xref = OF_xref_from_node(node);
OF_device_register_xref(xref, dev);
return (0);
}
static int
softdma_detach(device_t dev)
{
struct softdma_softc *sc;
sc = device_get_softc(dev);
return (0);
}
static int
softdma_process_tx(struct softdma_channel *chan, struct softdma_desc *desc)
{
struct softdma_softc *sc;
uint32_t src_offs, dst_offs;
uint32_t reg;
uint32_t fill_level;
uint32_t leftm;
uint32_t tmp;
uint32_t val;
uint32_t c;
sc = chan->sc;
fill_level = softdma_fill_level(sc);
while (fill_level == AVALON_FIFO_TX_BASIC_OPTS_DEPTH)
fill_level = softdma_fill_level(sc);
/* Set start of packet. */
if (desc->control & CONTROL_GEN_SOP) {
reg = 0;
reg |= A_ONCHIP_FIFO_MEM_CORE_SOP;
softdma_mem_write(sc, A_ONCHIP_FIFO_MEM_CORE_METADATA, reg);
}
src_offs = dst_offs = 0;
c = 0;
while ((desc->len - c) >= 4) {
val = *(uint32_t *)(desc->src_addr + src_offs);
bus_write_4(sc->res[0], A_ONCHIP_FIFO_MEM_CORE_DATA, val);
if (desc->src_incr)
src_offs += 4;
if (desc->dst_incr)
dst_offs += 4;
fill_level += 1;
while (fill_level == AVALON_FIFO_TX_BASIC_OPTS_DEPTH) {
fill_level = softdma_fill_level(sc);
}
c += 4;
}
val = 0;
leftm = (desc->len - c);
switch (leftm) {
case 1:
val = *(uint8_t *)(desc->src_addr + src_offs);
val <<= 24;
src_offs += 1;
break;
case 2:
case 3:
val = *(uint16_t *)(desc->src_addr + src_offs);
val <<= 16;
src_offs += 2;
if (leftm == 3) {
tmp = *(uint8_t *)(desc->src_addr + src_offs);
val |= (tmp << 8);
src_offs += 1;
}
break;
case 0:
default:
break;
}
/* Set end of packet. */
reg = 0;
if (desc->control & CONTROL_GEN_EOP)
reg |= A_ONCHIP_FIFO_MEM_CORE_EOP;
reg |= ((4 - leftm) << A_ONCHIP_FIFO_MEM_CORE_EMPTY_SHIFT);
softdma_mem_write(sc, A_ONCHIP_FIFO_MEM_CORE_METADATA, reg);
/* Ensure there is a FIFO entry available. */
fill_level = softdma_fill_level(sc);
while (fill_level == AVALON_FIFO_TX_BASIC_OPTS_DEPTH)
fill_level = softdma_fill_level(sc);
/* Final write */
bus_write_4(sc->res[0], A_ONCHIP_FIFO_MEM_CORE_DATA, val);
return (dst_offs);
}
static int
softdma_process_rx(struct softdma_channel *chan, struct softdma_desc *desc)
{
uint32_t src_offs, dst_offs;
struct softdma_softc *sc;
uint32_t fill_level;
uint32_t empty;
uint32_t meta;
uint32_t data;
int sop_rcvd;
int timeout;
size_t len;
int error;
sc = chan->sc;
empty = 0;
src_offs = dst_offs = 0;
error = 0;
fill_level = softdma_fill_level(sc);
if (fill_level == 0) {
/* Nothing to receive. */
return (0);
}
len = desc->len;
sop_rcvd = 0;
while (fill_level) {
empty = 0;
data = bus_read_4(sc->res[0], A_ONCHIP_FIFO_MEM_CORE_DATA);
meta = softdma_mem_read(sc, A_ONCHIP_FIFO_MEM_CORE_METADATA);
if (meta & A_ONCHIP_FIFO_MEM_CORE_ERROR_MASK) {
error = 1;
break;
}
if ((meta & A_ONCHIP_FIFO_MEM_CORE_CHANNEL_MASK) != 0) {
error = 1;
break;
}
if (meta & A_ONCHIP_FIFO_MEM_CORE_SOP) {
sop_rcvd = 1;
}
if (meta & A_ONCHIP_FIFO_MEM_CORE_EOP) {
empty = (meta & A_ONCHIP_FIFO_MEM_CORE_EMPTY_MASK) >>
A_ONCHIP_FIFO_MEM_CORE_EMPTY_SHIFT;
}
if (sop_rcvd == 0) {
error = 1;
break;
}
if (empty == 0) {
*(uint32_t *)(desc->dst_addr + dst_offs) = data;
dst_offs += 4;
} else if (empty == 1) {
*(uint16_t *)(desc->dst_addr + dst_offs) =
((data >> 16) & 0xffff);
dst_offs += 2;
*(uint8_t *)(desc->dst_addr + dst_offs) =
((data >> 8) & 0xff);
dst_offs += 1;
} else {
panic("empty %d\n", empty);
}
if (meta & A_ONCHIP_FIFO_MEM_CORE_EOP)
break;
fill_level = softdma_fill_level(sc);
timeout = 100;
while (fill_level == 0 && timeout--)
fill_level = softdma_fill_level(sc);
if (timeout == 0) {
/* No EOP received. Broken packet. */
error = 1;
break;
}
}
if (error) {
return (-1);
}
return (dst_offs);
}
static uint32_t
softdma_process_descriptors(struct softdma_channel *chan,
xdma_transfer_status_t *status)
{
struct xdma_channel *xchan;
struct softdma_desc *desc;
struct softdma_softc *sc;
xdma_transfer_status_t st;
int ret;
sc = chan->sc;
xchan = chan->xchan;
desc = &chan->descs[chan->idx_tail];
while (desc != NULL) {
if ((desc->control & CONTROL_OWN) == 0) {
break;
}
if (desc->direction == XDMA_MEM_TO_DEV) {
ret = softdma_process_tx(chan, desc);
} else {
ret = softdma_process_rx(chan, desc);
if (ret == 0) {
/* No new data available. */
break;
}
}
/* Descriptor processed. */
desc->control = 0;
if (ret >= 0) {
st.error = 0;
st.transferred = ret;
} else {
st.error = ret;
st.transferred = 0;
}
xchan_seg_done(xchan, &st);
atomic_subtract_int(&chan->descs_used_count, 1);
if (ret >= 0) {
status->transferred += ret;
} else {
status->error = 1;
break;
}
chan->idx_tail = softdma_next_desc(chan, chan->idx_tail);
/* Process next descriptor, if any. */
desc = desc->next;
}
return (0);
}
static void
softdma_worker(void *arg)
{
xdma_transfer_status_t status;
struct softdma_channel *chan;
struct softdma_softc *sc;
chan = arg;
sc = chan->sc;
while (1) {
mtx_lock(&chan->mtx);
do {
mtx_sleep(chan, &chan->mtx, 0, "softdma_wait", hz / 2);
} while (chan->run == 0);
status.error = 0;
status.transferred = 0;
softdma_process_descriptors(chan, &status);
/* Finish operation */
chan->run = 0;
xdma_callback(chan->xchan, &status);
mtx_unlock(&chan->mtx);
}
}
static int
softdma_proc_create(struct softdma_channel *chan)
{
struct softdma_softc *sc;
sc = chan->sc;
if (chan->p != NULL) {
/* Already created */
return (0);
}
mtx_init(&chan->mtx, "SoftDMA", NULL, MTX_DEF);
if (kproc_create(softdma_worker, (void *)chan, &chan->p, 0, 0,
"softdma_worker") != 0) {
device_printf(sc->dev,
"%s: Failed to create worker thread.\n", __func__);
return (-1);
}
return (0);
}
static int
softdma_channel_alloc(device_t dev, struct xdma_channel *xchan)
{
struct softdma_channel *chan;
struct softdma_softc *sc;
int i;
sc = device_get_softc(dev);
for (i = 0; i < SOFTDMA_NCHANNELS; i++) {
chan = &sc->channels[i];
if (chan->used == 0) {
chan->xchan = xchan;
xchan->chan = (void *)chan;
chan->index = i;
chan->idx_head = 0;
chan->idx_tail = 0;
chan->descs_used_count = 0;
chan->descs_num = 1024;
chan->sc = sc;
if (softdma_proc_create(chan) != 0) {
return (-1);
}
chan->used = 1;
return (0);
}
}
return (-1);
}
static int
softdma_channel_free(device_t dev, struct xdma_channel *xchan)
{
struct softdma_channel *chan;
struct softdma_softc *sc;
sc = device_get_softc(dev);
chan = (struct softdma_channel *)xchan->chan;
if (chan->descs != NULL) {
free(chan->descs, M_DEVBUF);
}
chan->used = 0;
return (0);
}
static int
softdma_desc_alloc(struct xdma_channel *xchan)
{
struct softdma_channel *chan;
uint32_t nsegments;
chan = (struct softdma_channel *)xchan->chan;
nsegments = chan->descs_num;
chan->descs = malloc(nsegments * sizeof(struct softdma_desc),
M_DEVBUF, (M_WAITOK | M_ZERO));
return (0);
}
static int
softdma_channel_prep_sg(device_t dev, struct xdma_channel *xchan)
{
struct softdma_channel *chan;
struct softdma_desc *desc;
struct softdma_softc *sc;
int ret;
int i;
sc = device_get_softc(dev);
chan = (struct softdma_channel *)xchan->chan;
ret = softdma_desc_alloc(xchan);
if (ret != 0) {
device_printf(sc->dev,
"%s: Can't allocate descriptors.\n", __func__);
return (-1);
}
for (i = 0; i < chan->descs_num; i++) {
desc = &chan->descs[i];
if (i == (chan->descs_num - 1)) {
desc->next = &chan->descs[0];
} else {
desc->next = &chan->descs[i+1];
}
}
return (0);
}
static int
softdma_channel_capacity(device_t dev, xdma_channel_t *xchan,
uint32_t *capacity)
{
struct softdma_channel *chan;
uint32_t c;
chan = (struct softdma_channel *)xchan->chan;
/* At least one descriptor must be left empty. */
c = (chan->descs_num - chan->descs_used_count - 1);
*capacity = c;
return (0);
}
static int
softdma_channel_submit_sg(device_t dev, struct xdma_channel *xchan,
struct xdma_sglist *sg, uint32_t sg_n)
{
struct softdma_channel *chan;
struct softdma_desc *desc;
struct softdma_softc *sc;
uint32_t enqueued;
uint32_t saved_dir;
uint32_t tmp;
uint32_t len;
int i;
sc = device_get_softc(dev);
chan = (struct softdma_channel *)xchan->chan;
enqueued = 0;
for (i = 0; i < sg_n; i++) {
len = (uint32_t)sg[i].len;
desc = &chan->descs[chan->idx_head];
desc->src_addr = sg[i].src_addr;
desc->dst_addr = sg[i].dst_addr;
if (sg[i].direction == XDMA_MEM_TO_DEV) {
desc->src_incr = 1;
desc->dst_incr = 0;
} else {
desc->src_incr = 0;
desc->dst_incr = 1;
}
desc->direction = sg[i].direction;
saved_dir = sg[i].direction;
desc->len = len;
desc->transfered = 0;
desc->status = 0;
desc->reserved = 0;
desc->control = 0;
if (sg[i].first == 1)
desc->control |= CONTROL_GEN_SOP;
if (sg[i].last == 1)
desc->control |= CONTROL_GEN_EOP;
tmp = chan->idx_head;
chan->idx_head = softdma_next_desc(chan, chan->idx_head);
atomic_add_int(&chan->descs_used_count, 1);
desc->control |= CONTROL_OWN;
enqueued += 1;
}
if (enqueued == 0)
return (0);
if (saved_dir == XDMA_MEM_TO_DEV) {
chan->run = 1;
wakeup(chan);
} else
softdma_memc_write(sc,
A_ONCHIP_FIFO_MEM_CORE_STATUS_REG_INT_ENABLE,
SOFTDMA_RX_EVENTS);
return (0);
}
static int
softdma_channel_request(device_t dev, struct xdma_channel *xchan,
struct xdma_request *req)
{
struct softdma_channel *chan;
struct softdma_desc *desc;
struct softdma_softc *sc;
int ret;
sc = device_get_softc(dev);
chan = (struct softdma_channel *)xchan->chan;
ret = softdma_desc_alloc(xchan);
if (ret != 0) {
device_printf(sc->dev,
"%s: Can't allocate descriptors.\n", __func__);
return (-1);
}
desc = &chan->descs[0];
desc->src_addr = req->src_addr;
desc->dst_addr = req->dst_addr;
desc->len = req->block_len;
desc->src_incr = 1;
desc->dst_incr = 1;
desc->next = NULL;
return (0);
}
static int
softdma_channel_control(device_t dev, xdma_channel_t *xchan, int cmd)
{
struct softdma_channel *chan;
struct softdma_softc *sc;
sc = device_get_softc(dev);
chan = (struct softdma_channel *)xchan->chan;
switch (cmd) {
case XDMA_CMD_BEGIN:
case XDMA_CMD_TERMINATE:
case XDMA_CMD_PAUSE:
/* TODO: implement me */
return (-1);
}
return (0);
}
#ifdef FDT
static int
softdma_ofw_md_data(device_t dev, pcell_t *cells,
int ncells, void **ptr)
{
return (0);
}
#endif
static device_method_t softdma_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, softdma_probe),
DEVMETHOD(device_attach, softdma_attach),
DEVMETHOD(device_detach, softdma_detach),
/* xDMA Interface */
DEVMETHOD(xdma_channel_alloc, softdma_channel_alloc),
DEVMETHOD(xdma_channel_free, softdma_channel_free),
DEVMETHOD(xdma_channel_request, softdma_channel_request),
DEVMETHOD(xdma_channel_control, softdma_channel_control),
/* xDMA SG Interface */
DEVMETHOD(xdma_channel_prep_sg, softdma_channel_prep_sg),
DEVMETHOD(xdma_channel_submit_sg, softdma_channel_submit_sg),
DEVMETHOD(xdma_channel_capacity, softdma_channel_capacity),
#ifdef FDT
DEVMETHOD(xdma_ofw_md_data, softdma_ofw_md_data),
#endif
DEVMETHOD_END
};
static driver_t softdma_driver = {
"softdma",
softdma_methods,
sizeof(struct softdma_softc),
};
static devclass_t softdma_devclass;
EARLY_DRIVER_MODULE(softdma, simplebus, softdma_driver, softdma_devclass, 0, 0,
BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);