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aw_sid(4): Add support for Allwinner H3

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The sid controller on the H3 is generally identical in location, size, and
efuse offset to the a64 and the a83t. The main difference is that the H3 has
a silicon bug that sometimes causes the rootkey (at least) to be garbled
unless first read by the prctl registers.

This device is currently not in our DTS and, as of now, is not yet present
in mainline Linux DTS.

Tested on:	OrangePi One
This commit is contained in:
kevans 2018-01-07 04:59:28 +00:00
parent e49410983a
commit 2207d053fe
2 changed files with 33 additions and 1 deletions
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4
share/man/man4/aw_sid.4
View File

@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd January 2, 2018
.Dd January 6, 2018
.Dt AW_SID 4
.Os
.Sh NAME
@ -52,6 +52,8 @@ allwinner,sun7i-a20-sid
allwinner,sun50i-a64-sid
.It
allwinner,sun8i-a83t-sid
.It
allwinner,sun8i-h3-sid
.El
.Sh SYSCTL VARIABLES
The following read-only variables are available via

30
sys/arm/allwinner/aw_sid.c
View File

@ -67,36 +67,51 @@ __FBSDID("$FreeBSD$");
#define ROOT_KEY_SIZE 4
struct aw_sid_conf {
bus_size_t efuse_size;
bus_size_t rootkey_offset;
bool has_prctl;
bool has_thermal;
bool requires_prctl_read;
};
static const struct aw_sid_conf a10_conf = {
.efuse_size = 0x10,
.rootkey_offset = 0,
};
static const struct aw_sid_conf a20_conf = {
.efuse_size = 0x10,
.rootkey_offset = 0,
};
static const struct aw_sid_conf a64_conf = {
.efuse_size = 0x100,
.rootkey_offset = SID_SRAM,
.has_prctl = true,
.has_thermal = true,
};
static const struct aw_sid_conf a83t_conf = {
.efuse_size = 0x100,
.rootkey_offset = SID_SRAM,
.has_prctl = true,
.has_thermal = true,
};
static const struct aw_sid_conf h3_conf = {
.efuse_size = 0x100,
.rootkey_offset = SID_SRAM,
.has_prctl = true,
.has_thermal = true,
.requires_prctl_read = true,
};
static struct ofw_compat_data compat_data[] = {
{ "allwinner,sun4i-a10-sid", (uintptr_t)&a10_conf},
{ "allwinner,sun7i-a20-sid", (uintptr_t)&a20_conf},
{ "allwinner,sun50i-a64-sid", (uintptr_t)&a64_conf},
{ "allwinner,sun8i-a83t-sid", (uintptr_t)&a83t_conf},
{ "allwinner,sun8i-h3-sid", (uintptr_t)&h3_conf},
{ NULL, 0 }
};
@ -168,6 +183,8 @@ static int
aw_sid_attach(device_t dev)
{
struct aw_sid_softc *sc;
bus_size_t i;
uint32_t val;
sc = device_get_softc(dev);
@ -180,6 +197,19 @@ aw_sid_attach(device_t dev)
sc->sid_conf = (struct aw_sid_conf *)ofw_bus_search_compatible(dev, compat_data)->ocd_data;
aw_sid_sc = sc;
/*
* This set of reads is solely for working around a silicon bug on some
* SoC that require a prctl read in order for direct register access to
* return a non-garbled value. Hence, the values we read are simply
* ignored.
*/
if (sc->sid_conf->requires_prctl_read)
for (i = 0; i < sc->sid_conf->efuse_size; i += 4)
if (aw_sid_prctl_read(dev, i, &val) != 0) {
device_printf(dev, "failed prctl read\n");
return (ENXIO);
}
SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "rootkey",