linux-kernel - [PATCH net-next 5/6] net: ipa: update GSI ring size registers

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Date:   Thu, 25 Mar 2021 09:44:36 -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 5/6] net: ipa: update GSI ring size registers

Each GSI channel has a CNTXT_1 register that encodes the size of its
ring buffer.  The size of the field that records that is increased
starting at IPA v4.9.  Replace the use of a fixed-size field mask
with a new inline function that encodes that size value.

Similarly, the size of GSI event rings can be larger starting with
IPA v4.9, so create a function to encode that as well.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/gsi.c     |  7 +++++--
 drivers/net/ipa/gsi_reg.h | 17 +++++++++++++++--
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 7f2a8fce5e0db..6f146288f9e41 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -701,7 +701,7 @@ static void gsi_evt_ring_program(struct gsi *gsi, u32 evt_ring_id)
 	val |= u32_encode_bits(GSI_RING_ELEMENT_SIZE, EV_ELEMENT_SIZE_FMASK);
 	iowrite32(val, gsi->virt + GSI_EV_CH_E_CNTXT_0_OFFSET(evt_ring_id));
 
-	val = u32_encode_bits(size, EV_R_LENGTH_FMASK);
+	val = ev_r_length_encoded(gsi->version, size);
 	iowrite32(val, gsi->virt + GSI_EV_CH_E_CNTXT_1_OFFSET(evt_ring_id));
 
 	/* The context 2 and 3 registers store the low-order and
@@ -808,7 +808,7 @@ static void gsi_channel_program(struct gsi_channel *channel, bool doorbell)
 	val |= u32_encode_bits(GSI_RING_ELEMENT_SIZE, ELEMENT_SIZE_FMASK);
 	iowrite32(val, gsi->virt + GSI_CH_C_CNTXT_0_OFFSET(channel_id));
 
-	val = u32_encode_bits(size, R_LENGTH_FMASK);
+	val = r_length_encoded(gsi->version, size);
 	iowrite32(val, gsi->virt + GSI_CH_C_CNTXT_1_OFFSET(channel_id));
 
 	/* The context 2 and 3 registers store the low-order and
@@ -842,6 +842,9 @@ static void gsi_channel_program(struct gsi_channel *channel, bool doorbell)
 			val |= u32_encode_bits(GSI_ESCAPE_BUF_ONLY,
 					       PREFETCH_MODE_FMASK);
 	}
+	/* All channels set DB_IN_BYTES */
+	if (gsi->version >= IPA_VERSION_4_9)
+		val |= DB_IN_BYTES;
 
 	iowrite32(val, gsi->virt + GSI_CH_C_QOS_OFFSET(channel_id));
 
diff --git a/drivers/net/ipa/gsi_reg.h b/drivers/net/ipa/gsi_reg.h
index 6b53adbc667af..d964015a4409f 100644
--- a/drivers/net/ipa/gsi_reg.h
+++ b/drivers/net/ipa/gsi_reg.h
@@ -90,7 +90,14 @@ enum gsi_channel_type {
 		GSI_EE_N_CH_C_CNTXT_1_OFFSET((ch), GSI_EE_AP)
 #define GSI_EE_N_CH_C_CNTXT_1_OFFSET(ch, ee) \
 		(0x0001c004 + 0x4000 * (ee) + 0x80 * (ch))
-#define R_LENGTH_FMASK			GENMASK(15, 0)
+
+/* Encoded value for CH_C_CNTXT_1 register R_LENGTH field */
+static inline u32 r_length_encoded(enum ipa_version version, u32 length)
+{
+	if (version < IPA_VERSION_4_9)
+		return u32_encode_bits(length, GENMASK(15, 0));
+	return u32_encode_bits(length, GENMASK(19, 0));
+}
 
 #define GSI_CH_C_CNTXT_2_OFFSET(ch) \
 		GSI_EE_N_CH_C_CNTXT_2_OFFSET((ch), GSI_EE_AP)
@@ -161,7 +168,13 @@ enum gsi_prefetch_mode {
 		GSI_EE_N_EV_CH_E_CNTXT_1_OFFSET((ev), GSI_EE_AP)
 #define GSI_EE_N_EV_CH_E_CNTXT_1_OFFSET(ev, ee) \
 		(0x0001d004 + 0x4000 * (ee) + 0x80 * (ev))
-#define EV_R_LENGTH_FMASK		GENMASK(15, 0)
+/* Encoded value for EV_CH_C_CNTXT_1 register EV_R_LENGTH field */
+static inline u32 ev_r_length_encoded(enum ipa_version version, u32 length)
+{
+	if (version < IPA_VERSION_4_9)
+		return u32_encode_bits(length, GENMASK(15, 0));
+	return u32_encode_bits(length, GENMASK(19, 0));
+}
 
 #define GSI_EV_CH_E_CNTXT_2_OFFSET(ev) \
 		GSI_EE_N_EV_CH_E_CNTXT_2_OFFSET((ev), GSI_EE_AP)
-- 
2.27.0