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freebsd-nq/sys/arm/at91/at91_spi.c
Kevin Lo d11bbab85d Remove pointless semicolons after label
2011-09-30 04:55:23 +00:00

306 lines
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/*-
* Copyright (c) 2006 M. Warner Losh. 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 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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <arm/at91/at91_spireg.h>
#include <arm/at91/at91_pdcreg.h>
#include <dev/spibus/spi.h>
#include "spibus_if.h"
struct at91_spi_softc
{
device_t dev; /* Myself */
void *intrhand; /* Interrupt handle */
struct resource *irq_res; /* IRQ resource */
struct resource *mem_res; /* Memory resource */
bus_dma_tag_t dmatag; /* bus dma tag for mbufs */
bus_dmamap_t map[4]; /* Maps for the transaction */
int rxdone;
};
static inline uint32_t
RD4(struct at91_spi_softc *sc, bus_size_t off)
{
return bus_read_4(sc->mem_res, off);
}
static inline void
WR4(struct at91_spi_softc *sc, bus_size_t off, uint32_t val)
{
bus_write_4(sc->mem_res, off, val);
}
/* bus entry points */
static int at91_spi_probe(device_t dev);
static int at91_spi_attach(device_t dev);
static int at91_spi_detach(device_t dev);
/* helper routines */
static int at91_spi_activate(device_t dev);
static void at91_spi_deactivate(device_t dev);
static void at91_spi_intr(void *arg);
static int
at91_spi_probe(device_t dev)
{
device_set_desc(dev, "SPI");
return (0);
}
static int
at91_spi_attach(device_t dev)
{
struct at91_spi_softc *sc = device_get_softc(dev);
int err, i;
sc->dev = dev;
err = at91_spi_activate(dev);
if (err)
goto out;
/*
* Allocate DMA tags and maps
*/
err = bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL, 2058, 1,
2048, BUS_DMA_ALLOCNOW, NULL, NULL, &sc->dmatag);
if (err != 0)
goto out;
for (i = 0; i < 4; i++) {
err = bus_dmamap_create(sc->dmatag, 0, &sc->map[i]);
if (err != 0)
goto out;
}
// reset the SPI
WR4(sc, SPI_CR, SPI_CR_SWRST);
WR4(sc, SPI_IDR, 0xffffffff);
WR4(sc, SPI_MR, (0xf << 24) | SPI_MR_MSTR | SPI_MR_MODFDIS |
(0xE << 16));
WR4(sc, SPI_CSR0, SPI_CSR_CPOL | (4 << 16) | (2 << 8));
WR4(sc, SPI_CR, SPI_CR_SPIEN);
WR4(sc, PDC_PTCR, PDC_PTCR_TXTDIS);
WR4(sc, PDC_PTCR, PDC_PTCR_RXTDIS);
WR4(sc, PDC_RNPR, 0);
WR4(sc, PDC_RNCR, 0);
WR4(sc, PDC_TNPR, 0);
WR4(sc, PDC_TNCR, 0);
WR4(sc, PDC_RPR, 0);
WR4(sc, PDC_RCR, 0);
WR4(sc, PDC_TPR, 0);
WR4(sc, PDC_TCR, 0);
RD4(sc, SPI_RDR);
RD4(sc, SPI_SR);
device_add_child(dev, "spibus", -1);
bus_generic_attach(dev);
out:
if (err)
at91_spi_deactivate(dev);
return (err);
}
static int
at91_spi_detach(device_t dev)
{
return (EBUSY); /* XXX */
}
static int
at91_spi_activate(device_t dev)
{
struct at91_spi_softc *sc;
int rid, err = ENOMEM;
sc = device_get_softc(dev);
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL)
goto errout;
rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (sc->irq_res == NULL)
goto errout;
err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
NULL, at91_spi_intr, sc, &sc->intrhand);
if (err != 0)
goto errout;
return (0);
errout:
at91_spi_deactivate(dev);
return (err);
}
static void
at91_spi_deactivate(device_t dev)
{
struct at91_spi_softc *sc;
sc = device_get_softc(dev);
if (sc->intrhand)
bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
sc->intrhand = 0;
bus_generic_detach(sc->dev);
if (sc->mem_res)
bus_release_resource(dev, SYS_RES_IOPORT,
rman_get_rid(sc->mem_res), sc->mem_res);
sc->mem_res = 0;
if (sc->irq_res)
bus_release_resource(dev, SYS_RES_IRQ,
rman_get_rid(sc->irq_res), sc->irq_res);
sc->irq_res = 0;
return;
}
static void
at91_getaddr(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
if (error != 0)
return;
*(bus_addr_t *)arg = segs[0].ds_addr;
}
static int
at91_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
{
struct at91_spi_softc *sc;
int i, j, rxdone, err, mode[4];
bus_addr_t addr;
sc = device_get_softc(dev);
WR4(sc, PDC_PTCR, PDC_PTCR_TXTDIS | PDC_PTCR_RXTDIS);
i = 0;
if (bus_dmamap_load(sc->dmatag, sc->map[i], cmd->tx_cmd,
cmd->tx_cmd_sz, at91_getaddr, &addr, 0) != 0)
goto out;
WR4(sc, PDC_TPR, addr);
WR4(sc, PDC_TCR, cmd->tx_cmd_sz);
bus_dmamap_sync(sc->dmatag, sc->map[i], BUS_DMASYNC_PREWRITE);
mode[i++] = BUS_DMASYNC_POSTWRITE;
if (cmd->tx_data_sz > 0) {
if (bus_dmamap_load(sc->dmatag, sc->map[i], cmd->tx_data,
cmd->tx_data_sz, at91_getaddr, &addr, 0) != 0)
goto out;
WR4(sc, PDC_TNPR, addr);
WR4(sc, PDC_TNCR, cmd->tx_data_sz);
bus_dmamap_sync(sc->dmatag, sc->map[i], BUS_DMASYNC_PREWRITE);
mode[i++] = BUS_DMASYNC_POSTWRITE;
}
if (bus_dmamap_load(sc->dmatag, sc->map[i], cmd->rx_cmd,
cmd->tx_cmd_sz, at91_getaddr, &addr, 0) != 0)
goto out;
WR4(sc, PDC_RPR, addr);
WR4(sc, PDC_RCR, cmd->tx_cmd_sz);
bus_dmamap_sync(sc->dmatag, sc->map[i], BUS_DMASYNC_PREREAD);
mode[i++] = BUS_DMASYNC_POSTREAD;
if (cmd->rx_data_sz > 0) {
if (bus_dmamap_load(sc->dmatag, sc->map[i], cmd->rx_data,
cmd->tx_data_sz, at91_getaddr, &addr, 0) != 0)
goto out;
WR4(sc, PDC_RNPR, addr);
WR4(sc, PDC_RNCR, cmd->rx_data_sz);
bus_dmamap_sync(sc->dmatag, sc->map[i], BUS_DMASYNC_PREREAD);
mode[i++] = BUS_DMASYNC_POSTREAD;
}
WR4(sc, SPI_IER, SPI_SR_ENDRX);
WR4(sc, PDC_PTCR, PDC_PTCR_TXTEN | PDC_PTCR_RXTEN);
rxdone = sc->rxdone;
do {
err = tsleep(&sc->rxdone, PCATCH | PZERO, "spi", hz);
} while (rxdone == sc->rxdone && err != EINTR);
WR4(sc, PDC_PTCR, PDC_PTCR_TXTDIS | PDC_PTCR_RXTDIS);
if (err == 0) {
for (j = 0; j < i; j++)
bus_dmamap_sync(sc->dmatag, sc->map[j], mode[j]);
}
for (j = 0; j < i; j++)
bus_dmamap_unload(sc->dmatag, sc->map[j]);
return (err);
out:
for (j = 0; j < i; j++)
bus_dmamap_unload(sc->dmatag, sc->map[j]);
return (EIO);
}
static void
at91_spi_intr(void *arg)
{
struct at91_spi_softc *sc = (struct at91_spi_softc*)arg;
uint32_t sr;
sr = RD4(sc, SPI_SR) & RD4(sc, SPI_IMR);
if (sr & SPI_SR_ENDRX) {
sc->rxdone++;
WR4(sc, SPI_IDR, SPI_SR_ENDRX);
wakeup(&sc->rxdone);
}
if (sr & ~SPI_SR_ENDRX) {
device_printf(sc->dev, "Unexpected ISR %#x\n", sr);
WR4(sc, SPI_IDR, sr & ~SPI_SR_ENDRX);
}
}
static devclass_t at91_spi_devclass;
static device_method_t at91_spi_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, at91_spi_probe),
DEVMETHOD(device_attach, at91_spi_attach),
DEVMETHOD(device_detach, at91_spi_detach),
/* spibus interface */
DEVMETHOD(spibus_transfer, at91_spi_transfer),
{ 0, 0 }
};
static driver_t at91_spi_driver = {
"spi",
at91_spi_methods,
sizeof(struct at91_spi_softc),
};
DRIVER_MODULE(at91_spi, atmelarm, at91_spi_driver, at91_spi_devclass, 0, 0);
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