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rtwn: add support for register IO debugging

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Add support to read/write the MAC/PHY registers.

Hide it behind RTWN_DEBUG.

This doesn't cover the RF registers as they require a different
IO path, but I haven't yet debugged the RF paths.

Locally tested:

* RTL8192CU, STA
* RTL8188EU, STA
* RTL8812AU / RTL8821AU, STA

Differential Revision:	https://reviews.freebsd.org/D48084
Reviewed by:	bz
This commit is contained in:
Adrian Chadd 2024-12-14 11:37:15 -08:00
parent 203027b2d5
commit 7ddf19492c
2 changed files with 35 additions and 0 deletions
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34
sys/dev/rtwn/if_rtwn.c
View file

@ -321,12 +321,46 @@ rtwn_radiotap_attach(struct rtwn_softc *sc)
&rxtap->wr_ihdr, sizeof(*rxtap), RTWN_RX_RADIOTAP_PRESENT);
}
#ifdef RTWN_DEBUG
static int
rtwn_sysctl_reg_readwrite(SYSCTL_HANDLER_ARGS)
{
struct rtwn_softc *sc = arg1;
int error;
uint32_t val;
if (sc->sc_reg_addr > 0xffff)
return (EINVAL);
RTWN_LOCK(sc);
val = rtwn_read_4(sc, sc->sc_reg_addr);
RTWN_UNLOCK(sc);
error = sysctl_handle_int(oidp, &val, 0, req);
if (error || !req->newptr)
return (error);
RTWN_LOCK(sc);
rtwn_write_4(sc, sc->sc_reg_addr, val);
RTWN_UNLOCK(sc);
return (0);
}
#endif /* RTWN_DEBUG */
void
rtwn_sysctlattach(struct rtwn_softc *sc)
{
struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev);
struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev);
sc->sc_reg_addr = 0;
#ifdef RTWN_DEBUG
SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
"reg_addr", CTLFLAG_RW, &sc->sc_reg_addr,
sc->sc_reg_addr, "debug register address");
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
"reg_val", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
rtwn_sysctl_reg_readwrite, "I", "debug register read/write");
#endif /* RTWN_DEBUG */
sc->sc_ht40 = 0;
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
"ht40", CTLFLAG_RDTUN, &sc->sc_ht40,

1
sys/dev/rtwn/if_rtwnvar.h
View file

@ -178,6 +178,7 @@ struct rtwn_softc {
int sc_hwcrypto;
int sc_ratectl_sysctl;
int sc_ratectl;
uint32_t sc_reg_addr;
uint8_t sc_detached;
uint8_t sc_flags;