netdev - [PATCH net-next 2/7] net: ipa: store BCR register values in config data

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Date:   Sun, 28 Mar 2021 12:31:06 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     bjorn.andersson@...aro.org, evgreen@...omium.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/7] net: ipa: store BCR register values in config data

The backward compatibility register value is a platform-specific
property that is not stored in the platform data.  Create a data
field where this can be represented, and get rid ipa_reg_bcr_val().

This register is not present starting with IPA v4.5.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_data-sc7180.c |  1 +
 drivers/net/ipa/ipa_data-sdm845.c |  5 +++++
 drivers/net/ipa/ipa_data.h        |  2 ++
 drivers/net/ipa/ipa_main.c        |  4 ++--
 drivers/net/ipa/ipa_reg.h         | 21 ---------------------
 5 files changed, 10 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ipa/ipa_data-sc7180.c b/drivers/net/ipa/ipa_data-sc7180.c
index c9b6a6aaadacc..810c673be56ee 100644
--- a/drivers/net/ipa/ipa_data-sc7180.c
+++ b/drivers/net/ipa/ipa_data-sc7180.c
@@ -349,6 +349,7 @@ static const struct ipa_clock_data ipa_clock_data = {
 /* Configuration data for the SC7180 SoC. */
 const struct ipa_data ipa_data_sc7180 = {
 	.version	= IPA_VERSION_4_2,
+	/* backward_compat value is 0 */
 	.qsb_count	= ARRAY_SIZE(ipa_qsb_data),
 	.qsb_data	= ipa_qsb_data,
 	.endpoint_count	= ARRAY_SIZE(ipa_gsi_endpoint_data),
diff --git a/drivers/net/ipa/ipa_data-sdm845.c b/drivers/net/ipa/ipa_data-sdm845.c
index e14e3fb1d9700..49a18b1047c58 100644
--- a/drivers/net/ipa/ipa_data-sdm845.c
+++ b/drivers/net/ipa/ipa_data-sdm845.c
@@ -397,6 +397,11 @@ static const struct ipa_clock_data ipa_clock_data = {
 /* Configuration data for the SDM845 SoC. */
 const struct ipa_data ipa_data_sdm845 = {
 	.version	= IPA_VERSION_3_5_1,
+	.backward_compat = BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK |
+			   BCR_TX_NOT_USING_BRESP_FMASK |
+			   BCR_SUSPEND_L2_IRQ_FMASK |
+			   BCR_HOLB_DROP_L2_IRQ_FMASK |
+			   BCR_DUAL_TX_FMASK,
 	.qsb_count	= ARRAY_SIZE(ipa_qsb_data),
 	.qsb_data	= ipa_qsb_data,
 	.endpoint_count	= ARRAY_SIZE(ipa_gsi_endpoint_data),
diff --git a/drivers/net/ipa/ipa_data.h b/drivers/net/ipa/ipa_data.h
index ea8f99286228e..843d818f78e18 100644
--- a/drivers/net/ipa/ipa_data.h
+++ b/drivers/net/ipa/ipa_data.h
@@ -279,6 +279,7 @@ struct ipa_clock_data {
 /**
  * struct ipa_data - combined IPA/GSI configuration data
  * @version:		IPA hardware version
+ * @backward_compat:	BCR register value (prior to IPA v4.5 only)
  * @qsb_count:		number of entries in the qsb_data array
  * @qsb_data:		Qualcomm System Bus configuration data
  * @endpoint_count:	number of entries in the endpoint_data array
@@ -289,6 +290,7 @@ struct ipa_clock_data {
  */
 struct ipa_data {
 	enum ipa_version version;
+	u32 backward_compat;
 	u32 qsb_count;		/* number of entries in qsb_data[] */
 	const struct ipa_qsb_data *qsb_data;
 	u32 endpoint_count;	/* number of entries in endpoint_data[] */
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index e18029152d780..afb8eb5618f73 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -397,9 +397,9 @@ static void ipa_hardware_config(struct ipa *ipa, const struct ipa_data *data)
 	u32 granularity;
 	u32 val;
 
-	/* IPA v4.5 has no backward compatibility register */
+	/* IPA v4.5+ has no backward compatibility register */
 	if (version < IPA_VERSION_4_5) {
-		val = ipa_reg_bcr_val(version);
+		val = data->backward_compat;
 		iowrite32(val, ipa->reg_virt + IPA_REG_BCR_OFFSET);
 	}
 
diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
index de2a944bad86b..286ea9634c49d 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -235,27 +235,6 @@ static inline u32 ipa_reg_state_aggr_active_offset(enum ipa_version version)
 #define BCR_FILTER_PREFETCH_EN_FMASK		GENMASK(8, 8)
 #define BCR_ROUTER_PREFETCH_EN_FMASK		GENMASK(9, 9)
 
-/* Backward compatibility register value to use for each version */
-static inline u32 ipa_reg_bcr_val(enum ipa_version version)
-{
-	if (version == IPA_VERSION_3_5_1)
-		return BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK |
-			BCR_TX_NOT_USING_BRESP_FMASK |
-			BCR_SUSPEND_L2_IRQ_FMASK |
-			BCR_HOLB_DROP_L2_IRQ_FMASK |
-			BCR_DUAL_TX_FMASK;
-
-	if (version == IPA_VERSION_4_0 || version == IPA_VERSION_4_1)
-		return BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK |
-			BCR_SUSPEND_L2_IRQ_FMASK |
-			BCR_HOLB_DROP_L2_IRQ_FMASK |
-			BCR_DUAL_TX_FMASK;
-
-	/* assert(version != IPA_VERSION_4_5); */
-
-	return 0x00000000;
-}
-
 /* The value of the next register must be a multiple of 8 (bottom 3 bits 0) */
 #define IPA_REG_LOCAL_PKT_PROC_CNTXT_OFFSET		0x000001e8
 
-- 
2.27.0