github.com/rdolbeau.SBusFPGA
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Add write() support for I, much faster than going through ioctl 16 bytes at a time...

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This commit is contained in:
Romain Dolbeau 2020-12-13 18:17:59 +01:00
parent 9ca5941af3
commit 0d2f75c7a6
1 changed files with 22 additions and 1 deletions
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23
NetBSD/9.0/usr/src/sys/dev/sbus/rdfpga.c
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@ -56,12 +56,13 @@ CFATTACH_DECL_NEW(rdfpga, sizeof(struct rdfpga_softc),
dev_type_open(rdfpga_open);
dev_type_close(rdfpga_close);
dev_type_ioctl(rdfpga_ioctl);
dev_type_write(rdfpga_write);
const struct cdevsw rdfpga_cdevsw = {
.d_open = rdfpga_open,
.d_close = rdfpga_close,
.d_read = noread,
.d_write = nowrite,
.d_write = rdfpga_write,
.d_ioctl = rdfpga_ioctl,
.d_stop = nostop,
.d_tty = notty,
@ -155,6 +156,26 @@ rdfpga_close(dev_t dev, int flags, int mode, struct lwp *l)
return (0);
}
int
rdfpga_write(dev_t dev, struct uio *uio, int flags)
{
struct rdfpga_softc *sc = device_lookup_private(&rdfpga_cd, minor(dev));
int error = 0;
while (uio->uio_resid > 0) {
uint64_t bp[2] = {0, 0};
size_t len = uimin(16, uio->uio_resid);
if ((error = uiomove(bp, len, uio)) != 0)
break;
bus_space_write_8(sc->sc_bustag, sc->sc_bhregs, (RDFPGA_REG_I + 0), bp[0]);
bus_space_write_8(sc->sc_bustag, sc->sc_bhregs, (RDFPGA_REG_I + 8), bp[1]);
}
return (error);
}
int
rdfpga_print(void *aux, const char *busname)
{