net: ipa: support more than 6 resource groups

IPA versions 3.0 and 3.1 support up to 8 resource groups.  There is
some interest in supporting these older versions of the hardware, so
update the resource configuration code to program resource limits
for these groups if specified.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/ipa_data.h

@@ -46,8 +46,8 @@
  * the IPA endpoint.
  */
 
-/* The maximum value returned by ipa_resource_group_{src,dst}_count() */
-#define IPA_RESOURCE_GROUP_MAX	5
+/* The maximum possible number of source or destination resource groups */
+#define IPA_RESOURCE_GROUP_MAX	8
 
 /** enum ipa_qsb_master_id - array index for IPA QSB configuration data */
 enum ipa_qsb_master_id {

drivers/net/ipa/ipa_reg.h

@@ -353,12 +353,16 @@ enum ipa_pulse_gran {
 					(0x00000404 + 0x0020 * (rt))
 #define IPA_REG_SRC_RSRC_GRP_45_RSRC_TYPE_N_OFFSET(rt) \
 					(0x00000408 + 0x0020 * (rt))
+#define IPA_REG_SRC_RSRC_GRP_67_RSRC_TYPE_N_OFFSET(rt) \
+					(0x0000040c + 0x0020 * (rt))
 #define IPA_REG_DST_RSRC_GRP_01_RSRC_TYPE_N_OFFSET(rt) \
 					(0x00000500 + 0x0020 * (rt))
 #define IPA_REG_DST_RSRC_GRP_23_RSRC_TYPE_N_OFFSET(rt) \
 					(0x00000504 + 0x0020 * (rt))
 #define IPA_REG_DST_RSRC_GRP_45_RSRC_TYPE_N_OFFSET(rt) \
 					(0x00000508 + 0x0020 * (rt))
+#define IPA_REG_DST_RSRC_GRP_67_RSRC_TYPE_N_OFFSET(rt) \
+					(0x0000050c + 0x0020 * (rt))
 /* The next four fields are used for all resource group registers */
 #define X_MIN_LIM_FMASK				GENMASK(5, 0)
 #define X_MAX_LIM_FMASK				GENMASK(13, 8)

drivers/net/ipa/ipa_resource.c

@@ -34,8 +34,8 @@ static bool ipa_resource_limits_valid(struct ipa *ipa,
 	u32 i;
 	u32 j;
 
-	/* We program at most 6 source or destination resource group limits */
-	BUILD_BUG_ON(IPA_RESOURCE_GROUP_MAX > 6);
+	/* We program at most 8 source or destination resource group limits */
+	BUILD_BUG_ON(IPA_RESOURCE_GROUP_MAX > 8);
 
 	group_count = data->rsrc_group_src_count;
 	if (!group_count || group_count > IPA_RESOURCE_GROUP_MAX)
@@ -113,6 +113,13 @@ static void ipa_resource_config_src(struct ipa *ipa, u32 resource_type,
 	offset = IPA_REG_SRC_RSRC_GRP_45_RSRC_TYPE_N_OFFSET(resource_type);
 	ylimits = group_count == 5 ? NULL : &resource->limits[5];
 	ipa_resource_config_common(ipa, offset, &resource->limits[4], ylimits);
+
+	if (group_count < 7)
+		return;
+
+	offset = IPA_REG_SRC_RSRC_GRP_67_RSRC_TYPE_N_OFFSET(resource_type);
+	ylimits = group_count == 7 ? NULL : &resource->limits[7];
+	ipa_resource_config_common(ipa, offset, &resource->limits[6], ylimits);
 }
 
 static void ipa_resource_config_dst(struct ipa *ipa, u32 resource_type,
@@ -142,6 +149,13 @@ static void ipa_resource_config_dst(struct ipa *ipa, u32 resource_type,
 	offset = IPA_REG_DST_RSRC_GRP_45_RSRC_TYPE_N_OFFSET(resource_type);
 	ylimits = group_count == 5 ? NULL : &resource->limits[5];
 	ipa_resource_config_common(ipa, offset, &resource->limits[4], ylimits);
+
+	if (group_count < 7)
+		return;
+
+	offset = IPA_REG_DST_RSRC_GRP_67_RSRC_TYPE_N_OFFSET(resource_type);
+	ylimits = group_count == 7 ? NULL : &resource->limits[7];
+	ipa_resource_config_common(ipa, offset, &resource->limits[6], ylimits);
 }
 
 /* Configure resources */