throttler: get board power limit from fwtable

Make board power limit a parameter from the FWTable in SPI. This allows
us to follow the product definition properly. The settings are:
- p100a = 300W
- p150a = 300W
- p150b = 300W
- p150c = 450W
It is not currently defined for the other platforms, so they will get a
limit of 0.

Signed-off-by: Aaron Fong <[email protected]>

Author: afongTT

boards/tenstorrent/tt_blackhole/spirom_data_tables/P100A/fw_table.txt

@@ -15,6 +15,7 @@ chip_limits {
   bus_peak_limit: 0
   frequency_margin: 0
   gddr_thm_limit: 85
+  board_power_limit: 300
 }
 
 feature_enable {

boards/tenstorrent/tt_blackhole/spirom_data_tables/P150A/fw_table.txt

@@ -15,6 +15,7 @@ chip_limits {
   bus_peak_limit: 0
   frequency_margin: 0
   gddr_thm_limit: 85
+  board_power_limit: 300
 }
 
 feature_enable {

boards/tenstorrent/tt_blackhole/spirom_data_tables/P150B/fw_table.txt

@@ -15,6 +15,7 @@ chip_limits {
   bus_peak_limit: 0
   frequency_margin: 0
   gddr_thm_limit: 85
+  board_power_limit: 300
 }
 
 feature_enable {

boards/tenstorrent/tt_blackhole/spirom_data_tables/P150C/fw_table.txt

@@ -15,6 +15,7 @@ chip_limits {
   bus_peak_limit: 0
   frequency_margin: 0
   gddr_thm_limit: 85
+  board_power_limit: 450
 }
 
 feature_enable {

lib/tenstorrent/bh_arc/spirom_protobufs/fw_table.proto

@@ -33,6 +33,7 @@ message FwTable {
     int32 frequency_margin = 11;
     uint32 asic_fmin = 12;
     uint32 gddr_thm_limit = 13;
+    uint32 board_power_limit = 14;
   }
 
   message FeatureEnable {

lib/tenstorrent/bh_arc/throttler.c

@@ -6,6 +6,7 @@
 
 #include <zephyr/sys/util.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/sys/byteorder.h>
 #include "throttler.h"
 #include "aiclk_ppm.h"
 #include "cm2dm_msg.h"
@@ -208,7 +209,10 @@ int32_t Dm2CmSetBoardPwrLimit(const uint8_t *data, uint8_t size)
 		return -1;
 	}
 
-	uint16_t pwr_limit = *(uint16_t *)data;
+	uint32_t pwr_limit = sys_get_le16(data);
+
+	LOG_INF("Cable Power Limit: %u\n", pwr_limit);
+	pwr_limit = MIN(pwr_limit, get_fw_table()->chip_limits.board_power_limit);
 
 	SetThrottlerLimit(kThrottlerBoardPwr, pwr_limit);
 	UpdateTelemetryBoardPwrLimit(pwr_limit);