Author: manu Date: Wed Jul 20 11:23:06 2016 New Revision: 303087 URL: https://svnweb.freebsd.org/changeset/base/303087
Log: Add support for the SID (Security ID Module) on Allwinner A10 and A20. The rootkey is burnt at production and can't be changed, thus is can be used as a device unique ID or to generate a MAC address (This is was u-boot does). The rootkey is exposed as a sysctl (dev.aw_sid.<unit>.rootkey). Reviewed by: jmcneill Differential Revision: https://reviews.freebsd.org/D6383 Modified: head/sys/arm/allwinner/aw_sid.c head/sys/arm/allwinner/aw_sid.h Modified: head/sys/arm/allwinner/aw_sid.c ============================================================================== --- head/sys/arm/allwinner/aw_sid.c Wed Jul 20 11:15:32 2016 (r303086) +++ head/sys/arm/allwinner/aw_sid.c Wed Jul 20 11:23:06 2016 (r303087) @@ -33,12 +33,14 @@ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); +#include <sys/endian.h> #include <sys/param.h> #include <sys/systm.h> #include <sys/bus.h> #include <sys/rman.h> #include <sys/kernel.h> #include <sys/module.h> +#include <sys/sysctl.h> #include <machine/bus.h> #include <dev/ofw/ofw_bus.h> @@ -50,13 +52,22 @@ __FBSDID("$FreeBSD$"); #define SID_THERMAL_CALIB0 (SID_SRAM + 0x34) #define SID_THERMAL_CALIB1 (SID_SRAM + 0x38) +enum sid_type { + A10_SID = 1, + A20_SID, + A83T_SID, +}; + static struct ofw_compat_data compat_data[] = { - { "allwinner,sun8i-a83t-sid", 1 }, + { "allwinner,sun4i-a10-sid", A10_SID}, + { "allwinner,sun7i-a20-sid", A20_SID}, + { "allwinner,sun8i-a83t-sid", A83T_SID}, { NULL, 0 } }; struct aw_sid_softc { struct resource *res; + int type; }; static struct aw_sid_softc *aw_sid_sc; @@ -66,9 +77,18 @@ static struct resource_spec aw_sid_spec[ { -1, 0 } }; +enum sid_keys { + AW_SID_ROOT_KEY, +}; + +#define ROOT_KEY_OFF 0x0 +#define ROOT_KEY_SIZE 4 + #define RD4(sc, reg) bus_read_4((sc)->res, (reg)) #define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) +static int aw_sid_sysctl(SYSCTL_HANDLER_ARGS); + static int aw_sid_probe(device_t dev) { @@ -96,6 +116,19 @@ aw_sid_attach(device_t dev) aw_sid_sc = sc; + sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data; + switch (sc->type) { + case A10_SID: + case A20_SID: + SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), + SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), + OID_AUTO, "rootkey", + CTLTYPE_STRING | CTLFLAG_RD, + dev, AW_SID_ROOT_KEY, aw_sid_sysctl, "A", "Root Key"); + break; + default: + break; + } return (0); } @@ -107,6 +140,8 @@ aw_sid_read_tscalib(uint32_t *calib0, ui sc = aw_sid_sc; if (sc == NULL) return (ENXIO); + if (sc->type != A83T_SID) + return (ENXIO); *calib0 = RD4(sc, SID_THERMAL_CALIB0); *calib1 = RD4(sc, SID_THERMAL_CALIB1); @@ -114,6 +149,45 @@ aw_sid_read_tscalib(uint32_t *calib0, ui return (0); } +int +aw_sid_get_rootkey(u_char *out) +{ + struct aw_sid_softc *sc; + int i; + u_int tmp; + + sc = aw_sid_sc; + if (sc == NULL) + return (ENXIO); + if (sc->type != A10_SID && sc->type != A20_SID) + return (ENXIO); + + for (i = 0; i < ROOT_KEY_SIZE ; i++) { + tmp = RD4(aw_sid_sc, ROOT_KEY_OFF + (i * 4)); + be32enc(&out[i * 4], tmp); + } + + return (0); +} + +static int +aw_sid_sysctl(SYSCTL_HANDLER_ARGS) +{ + enum sid_keys key = arg2; + u_char rootkey[16]; + char out[33]; + + if (key != AW_SID_ROOT_KEY) + return (ENOENT); + + if (aw_sid_get_rootkey(rootkey) != 0) + return (ENOENT); + snprintf(out, sizeof(out), + "%16D", rootkey, ""); + + return sysctl_handle_string(oidp, out, sizeof(out), req); +} + static device_method_t aw_sid_methods[] = { /* Device interface */ DEVMETHOD(device_probe, aw_sid_probe), Modified: head/sys/arm/allwinner/aw_sid.h ============================================================================== --- head/sys/arm/allwinner/aw_sid.h Wed Jul 20 11:15:32 2016 (r303086) +++ head/sys/arm/allwinner/aw_sid.h Wed Jul 20 11:23:06 2016 (r303087) @@ -30,5 +30,6 @@ #define __AW_SID_H__ int aw_sid_read_tscalib(uint32_t *, uint32_t *); +int aw_sid_get_rootkey(u_char *out); #endif /* !__AW_SID_H__ */ _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
