diff options
Diffstat (limited to 'hw/chiptod.c')
| -rw-r--r-- | hw/chiptod.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/hw/chiptod.c b/hw/chiptod.c index 18c4847..b452398 100644 --- a/hw/chiptod.c +++ b/hw/chiptod.c @@ -26,6 +26,10 @@ #include <timebase.h> #include <opal-api.h> +/* -- TOD primary/secondary master/slave status register -- */ +#define TOD_STATUS 0x00040008 +#define TOD_ST_TOPOLOGY_SELECT PPC_BITMASK(0, 2) + /* TOD chip XSCOM addresses */ #define TOD_TTYPE_0 0x00040011 #define TOD_TTYPE_1 0x00040012 /* PSS switch */ @@ -73,6 +77,10 @@ /* Number of iterations for the various timeouts */ #define TIMEOUT_LOOPS 20000000 +/* TOD active Primary/secondary configuration */ +#define TOD_PRI_CONF_IN_USE 0 /* Tod using primary topology*/ +#define TOD_SEC_CONF_IN_USE 7 /* Tod using secondary topo */ + /* Timebase State Machine error state */ #define TBST_STATE_ERROR 9 @@ -82,8 +90,15 @@ static enum chiptod_type { chiptod_p8 } chiptod_type; +enum chiptod_topology { + chiptod_topo_unknown = -1, + chiptod_topo_primary = 0, + chiptod_topo_secondary = 1, +}; + static int32_t chiptod_primary = -1; static int32_t chiptod_secondary = -1; +static enum chiptod_topology current_topology = chiptod_topo_unknown; /* The base TFMR value is the same for the whole machine * for now as far as I can tell @@ -97,6 +112,37 @@ static uint64_t base_tfmr; */ static struct lock chiptod_lock = LOCK_UNLOCKED; +static void print_topology_info(void) +{ + const char *topo[] = { "Unknown", "Primary", "Secondary" }; + + if (current_topology < 0) + return; + + prlog(PR_DEBUG, "CHIPTOD: TOD Topology in Use: %s\n", + topo[current_topology+1]); +} + +static enum chiptod_topology query_current_topology(void) +{ + uint64_t tod_status; + + if (xscom_readme(TOD_STATUS, &tod_status) != 0) { + prerror("CHIPTOD: XSCOM error reading TOD_STATUS reg\n"); + return chiptod_topo_unknown; + } + + /* + * Tod status register bit [0-2] tells configuration in use. + * 000 <= primary configuration in use + * 111 <= secondary configuration in use + */ + if ((tod_status & TOD_ST_TOPOLOGY_SELECT) == TOD_PRI_CONF_IN_USE) + return chiptod_topo_primary; + else + return chiptod_topo_secondary; +} + static void chiptod_setup_base_tfmr(void) { struct dt_node *cpu = this_cpu()->node; @@ -941,6 +987,14 @@ static bool chiptod_probe(void) return true; } +static void chiptod_init_topology_info(void) +{ + /* Find and update current topology in use. */ + current_topology = query_current_topology(); + + print_topology_info(); +} + void chiptod_init(void) { struct cpu_thread *cpu0, *cpu; @@ -1008,5 +1062,6 @@ void chiptod_init(void) chiptod_print_tb, NULL), true); } + chiptod_init_topology_info(); op_display(OP_LOG, OP_MOD_CHIPTOD, 4); } |