HDAT: Add IPMI sensor data under /bmc node

Add IPMI sensor data under /bmc node.

CC: Joel Stanley <joel@jms.id.au>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

3 files changed, 75 insertions, 2 deletions

diff --git a/hdata/fsp.c b/hdata/fsp.c
index 6953d97b..4846fcdf 100644
--- a/hdata/fsp.c
+++ b/hdata/fsp.c
@@ -23,6 +23,7 @@
 #include <inttypes.h>
 #include <phys-map.h>
 #include <chip.h>
+#include <ipmi.h>
 
 #include "hdata.h"
 
@@ -280,6 +281,53 @@ static void add_uart(const struct spss_iopath *iopath, struct dt_node *lpc)
 		be32_to_cpu(iopath->lpc.uart_baud));
 }
 
+static void add_ipmi_sensors(struct dt_node *bmc_node)
+{
+	int i;
+	const struct HDIF_common_hdr *hdif_sensor;
+	const struct ipmi_sensors *ipmi_sensors;
+	struct dt_node *sensors_node, *sensor_node;
+
+	hdif_sensor = get_hdif(&spira.ntuples.ipmi_sensor, IPMI_SENSORS_HDIF_SIG);
+	if (!hdif_sensor) {
+		prlog(PR_DEBUG, "SENSORS: Missing IPMI sensors mappings tuple\n");
+		return;
+	}
+
+	ipmi_sensors = HDIF_get_idata(hdif_sensor, IPMI_SENSORS_IDATA_SENSORS, NULL);
+	if (!ipmi_sensors) {
+		prlog(PR_DEBUG, "SENSORS: bad data\n");
+		return;
+	}
+
+	sensors_node = dt_new(bmc_node, "sensors");
+	assert(sensors_node);
+
+	dt_add_property_cells(sensors_node, "#address-cells", 1);
+	dt_add_property_cells(sensors_node, "#size-cells", 0);
+
+	for (i = 0; i < be32_to_cpu(ipmi_sensors->count); i++) {
+		if(dt_find_by_name_addr(sensors_node, "sensor",
+					ipmi_sensors->data[i].id)) {
+			prlog(PR_WARNING, "SENSORS: Duplicate sensor ID : %x\n",
+			      ipmi_sensors->data[i].id);
+			continue;
+		}
+
+		/* We support only < MAX_IPMI_SENSORS sensors */
+		if (!(ipmi_sensors->data[i].type < MAX_IPMI_SENSORS))
+			continue;
+
+		sensor_node = dt_new_addr(sensors_node, "sensor",
+					  ipmi_sensors->data[i].id);
+		assert(sensor_node);
+		dt_add_property_string(sensor_node, "compatible", "ibm,ipmi-sensor");
+		dt_add_property_cells(sensor_node, "reg", ipmi_sensors->data[i].id);
+		dt_add_property_cells(sensor_node, "ipmi-sensor-type",
+				      ipmi_sensors->data[i].type);
+	}
+}
+
 static void bmc_create_node(const struct HDIF_common_hdr *sp)
 {
 	struct dt_node *bmc_node;
@@ -297,7 +345,9 @@ static void bmc_create_node(const struct HDIF_common_hdr *sp)
 	dt_add_property_cells(bmc_node, "#address-cells", 1);
 	dt_add_property_cells(bmc_node, "#size-cells", 0);
 
-	/* TODO: add sensor info under /bmc */
+	/* Add sensor info under /bmc */
+	add_ipmi_sensors(bmc_node);
+
 	sp_impl = HDIF_get_idata(sp, SPSS_IDATA_SP_IMPL, &size);
 	if (CHECK_SPPTR(sp_impl) && (size > 8)) {
 		dt_add_property_strings(bmc_node, "compatible", sp_impl->sp_family);
diff --git a/hdata/spira.c b/hdata/spira.c
index 16ec46a8..d09dbfe1 100644
--- a/hdata/spira.c
+++ b/hdata/spira.c
@@ -1234,6 +1234,7 @@ static void fixup_spira(void)
 	spira.ntuples.pcia = spiras->ntuples.pcia;
 	spira.ntuples.proc_chip = spiras->ntuples.proc_chip;
 	spira.ntuples.hs_data = spiras->ntuples.hs_data;
+	spira.ntuples.ipmi_sensor = spiras->ntuples.ipmi_sensor;
 }
 
 int parse_hdat(bool is_opal)
diff --git a/hdata/spira.h b/hdata/spira.h
index bb7ad3e2..caea057e 100644
--- a/hdata/spira.h
+++ b/hdata/spira.h
@@ -68,6 +68,7 @@ struct spira_ntuples {
 	struct spira_ntuple	pcia;			/* 0x2e0 */
 	struct spira_ntuple	proc_chip;		/* 0x300 */
 	struct spira_ntuple	hs_data;		/* 0x320 */
+	struct spira_ntuple	ipmi_sensor;		/* 0x360 */
 };
 
 struct spira {
@@ -81,7 +82,7 @@ struct spira {
 	 *
 	 * According to FSP engineers, this is an okay thing to do.
 	 */
-	u8			reserved[0xc0];
+	u8			reserved[0xa0];
 } __packed __align(0x100);
 
 extern struct spira spira;
@@ -1063,6 +1064,27 @@ struct sppcrd_chip_tod {
 /* Idata index 0 : System attribute data */
 #define HSERV_IDATA_SYS_ATTR	0
 
+/* IPMI sensors mapping data */
+#define IPMI_SENSORS_HDIF_SIG	"FRUSE "
+
+/* Idata index 0 : Sensor mapping data */
+#define IPMI_SENSORS_IDATA_SENSORS	0
+
+struct ipmi_sensors_data {
+	__be32	slca_index;
+	uint8_t	type;
+	uint8_t	id;
+	__be16	reserved;
+} __packed;
+
+struct ipmi_sensors {
+	__be32	count;
+	struct ipmi_sensors_data data[];
+} __packed;
+
+/* Idata index 1 : LED - sensors ID mapping data */
+#define IPMI_SENSORS_IDATA_LED		1
+
 static inline const char *cpu_state(u32 flags)
 {
 	switch ((flags & CPU_ID_VERIFY_MASK) >> CPU_ID_VERIFY_SHIFT) {