net: ipa: add HW_PARAM_4 GSI register

Starting at IPA v5.0, the number of event rings per EE is defined
in a field in a new HW_PARAM_4 GSI register rather than HW_PARAM_2.
Define this new register and its fields, and update the code that
checks the number of rings supported by hardware to use the proper
field based on IPA version.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ipa/gsi.c

@@ -2042,7 +2042,12 @@ static int gsi_ring_setup(struct gsi *gsi)
 	}
 	gsi->channel_count = count;
 
+	if (gsi->version < IPA_VERSION_5_0) {
 		count = reg_decode(reg, NUM_EV_PER_EE, val);
+	} else {
+		reg = gsi_reg(gsi, HW_PARAM_4);
+		count = reg_decode(reg, EV_PER_EE, val);
+	}
 	if (!count) {
 		dev_err(dev, "GSI reports zero event rings supported\n");
 		return -EINVAL;

drivers/net/ipa/gsi_reg.h

@@ -71,6 +71,7 @@ enum gsi_reg_id {
 	EV_CH_CMD,
 	GENERIC_CMD,
 	HW_PARAM_2,					/* IPA v3.5.1+ */
+	HW_PARAM_4,					/* IPA v5.0+ */
 	CNTXT_TYPE_IRQ,
 	CNTXT_TYPE_IRQ_MSK,
 	CNTXT_SRC_CH_IRQ,
@@ -224,7 +225,7 @@ enum gsi_generic_cmd_opcode {
 enum gsi_hw_param_2_field_id {
 	IRAM_SIZE,
 	NUM_CH_PER_EE,
-	NUM_EV_PER_EE,
+	NUM_EV_PER_EE,					/* Not IPA v5.0+ */
 	GSI_CH_PEND_TRANSLATE,
 	GSI_CH_FULL_LOGIC,
 	GSI_USE_SDMA,					/* IPA v4.0+ */
@@ -247,6 +248,12 @@ enum gsi_iram_size {
 	IRAM_SIZE_FOUR_KB			= 0x5,
 };
 
+/* HW_PARAM_4 register */				/* IPA v5.0+ */
+enum gsi_hw_param_4_field_id {
+	EV_PER_EE,
+	IRAM_PROTOCOL_COUNT,
+};
+
 /**
  * enum gsi_irq_type_id: GSI IRQ types
  * @GSI_CH_CTRL:		Channel allocation, deallocation, etc.