[PATCH net-next 0/8] net: ipa: another set of cleanups

[PATCH net-next 0/8] net: ipa: another set of cleanups

[Alex Elder]

This series contains another set of cleanups done in preparation for
an upcoming series that reworks how IPA registers and their fields
are defined.

The first replaces the use of u32_replace_bits() with a simple
logical AND operation in two places.

The second creates a new function to encapsulate some common code,
and renames another for consistency.  The third restructures two
other functions that do similar things to make their similarity more
obvious.

The fourth defines the flag bits in a register using an enumerated
type.  And the fifth updates "ipa_reg.h" so the values assigned to
enumerated type members are aligned consistently.

The last three encapsulate the code that assigns values to a few
registers into separate functions.

					-Alex

Alex Elder (8):
  net: ipa: don't use u32p_replace_bits()
  net: ipa: introduce ipa_qtime_val()
  net: ipa: rearrange functions for similarity
  net: ipa: define BCR values using an enum
  net: ipa: tidy up register enum definitions
  net: ipa: encapsulate setting the FILT_ROUT_HASH_EN register
  net: ipa: encapsulate updating the COUNTER_CFG register
  net: ipa: encapsulate updating three more registers

 drivers/net/ipa/data/ipa_data-v3.1.c   |   2 +-
 drivers/net/ipa/data/ipa_data-v3.5.1.c |  10 +-
 drivers/net/ipa/ipa_endpoint.c         | 138 +++++++++++++------------
 drivers/net/ipa/ipa_main.c             | 135 +++++++++++++++---------
 drivers/net/ipa/ipa_reg.h              |  68 ++++++------
 drivers/net/ipa/ipa_table.c            |   4 +-
 6 files changed, 200 insertions(+), 157 deletions(-)

-- 
2.34.1

[PATCH net-next 1/8] net: ipa: don't use u32p_replace_bits()

[Alex Elder]

In two spots we use u32_replace_bits() to replace a set of bits in a
register while preserving the rest.  Both of those cases just zero
the bits being replaced, and this can be done more simply without
using that function.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_table.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index 69efe672ca528..037cec2fd5942 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -524,7 +524,7 @@ static void ipa_filter_tuple_zero(struct ipa_endpoint *endpoint)
 	val = ioread32(endpoint->ipa->reg_virt + offset);
 
 	/* Zero all filter-related fields, preserving the rest */
-	u32p_replace_bits(&val, 0, IPA_REG_ENDP_FILTER_HASH_MSK_ALL);
+	val &= ~IPA_REG_ENDP_FILTER_HASH_MSK_ALL;
 
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
@@ -571,7 +571,7 @@ static void ipa_route_tuple_zero(struct ipa *ipa, u32 route_id)
 	val = ioread32(ipa->reg_virt + offset);
 
 	/* Zero all route-related fields, preserving the rest */
-	u32p_replace_bits(&val, 0, IPA_REG_ENDP_ROUTER_HASH_MSK_ALL);
+	val &= ~IPA_REG_ENDP_ROUTER_HASH_MSK_ALL;
 
 	iowrite32(val, ipa->reg_virt + offset);
 }
-- 
2.34.1

[PATCH net-next 2/8] net: ipa: introduce ipa_qtime_val()

[Alex Elder]

Create a new function ipa_qtime_val() which returns a value that
indicates what should be encoded for a register with a time field
expressed using Qtime.  Use it to factor out common code in
aggr_time_limit_encoded() and hol_block_timer_qtime_val().

Rename aggr_time_limit_encoded() and hol_block_timer_qtime_val() so
their names are both verbs ending in "encode".  Rename the "limit"
argument to the former to be "milliseconds" for consistency.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 80 +++++++++++++++++++---------------
 1 file changed, 44 insertions(+), 36 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index fe0eb882104ee..7d91b423a1be7 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -725,17 +725,42 @@ static u32 aggr_byte_limit_encoded(enum ipa_version version, u32 limit)
 	return u32_encode_bits(limit, aggr_byte_limit_fmask(false));
 }
 
+/* For IPA v4.5+, times are expressed using Qtime.  The AP uses one of two
+ * pulse generators (0 and 1) to measure elapsed time.  In ipa_qtime_config()
+ * they're configured to have granularity 100 usec and 1 msec, respectively.
+ *
+ * The return value is the positive or negative Qtime value to use to
+ * express the (microsecond) time provided.  A positive return value
+ * means pulse generator 0 can be used; otherwise use pulse generator 1.
+ */
+static int ipa_qtime_val(u32 microseconds, u32 max)
+{
+	u32 val;
+
+	/* Use 100 microsecond granularity if possible */
+	val = DIV_ROUND_CLOSEST(microseconds, 100);
+	if (val <= max)
+		return (int)val;
+
+	/* Have to use pulse generator 1 (millisecond granularity) */
+	val = DIV_ROUND_CLOSEST(microseconds, 1000);
+	WARN_ON(val > max);
+
+	return (int)-val;
+}
+
 /* Encode the aggregation timer limit (microseconds) based on IPA version */
-static u32 aggr_time_limit_encoded(enum ipa_version version, u32 limit)
+static u32 aggr_time_limit_encode(enum ipa_version version, u32 microseconds)
 {
 	u32 gran_sel;
 	u32 fmask;
 	u32 val;
+	int ret;
 
 	if (version < IPA_VERSION_4_5) {
 		/* We set aggregation granularity in ipa_hardware_config() */
 		fmask = aggr_time_limit_fmask(true);
-		val = DIV_ROUND_CLOSEST(limit, IPA_AGGR_GRANULARITY);
+		val = DIV_ROUND_CLOSEST(microseconds, IPA_AGGR_GRANULARITY);
 		WARN(val > field_max(fmask),
 		     "aggr_time_limit too large (%u > %u usec)\n",
 		     val, field_max(fmask) * IPA_AGGR_GRANULARITY);
@@ -743,23 +768,14 @@ static u32 aggr_time_limit_encoded(enum ipa_version version, u32 limit)
 		return u32_encode_bits(val, fmask);
 	}
 
-	/* IPA v4.5 expresses the time limit using Qtime.  The AP has
-	 * pulse generators 0 and 1 available, which were configured
-	 * in ipa_qtime_config() to have granularity 100 usec and
-	 * 1 msec, respectively.  Use pulse generator 0 if possible,
-	 * otherwise fall back to pulse generator 1.
-	 */
+	/* Compute the Qtime limit value to use */
 	fmask = aggr_time_limit_fmask(false);
-	val = DIV_ROUND_CLOSEST(limit, 100);
-	if (val > field_max(fmask)) {
-		/* Have to use pulse generator 1 (millisecond granularity) */
+	ret = ipa_qtime_val(microseconds, field_max(fmask));
+	if (ret < 0) {
+		val = -ret;
 		gran_sel = AGGR_GRAN_SEL_FMASK;
-		val = DIV_ROUND_CLOSEST(limit, 1000);
-		WARN(val > field_max(fmask),
-		     "aggr_time_limit too large (%u > %u usec)\n",
-		     limit, field_max(fmask) * 1000);
 	} else {
-		/* We can use pulse generator 0 (100 usec granularity) */
+		val = ret;
 		gran_sel = 0;
 	}
 
@@ -799,7 +815,7 @@ static void ipa_endpoint_init_aggr(struct ipa_endpoint *endpoint)
 			val |= aggr_byte_limit_encoded(version, limit);
 
 			limit = rx_config->aggr_time_limit;
-			val |= aggr_time_limit_encoded(version, limit);
+			val |= aggr_time_limit_encode(version, limit);
 
 			/* AGGR_PKT_LIMIT is 0 (unlimited) */
 
@@ -825,24 +841,18 @@ static void ipa_endpoint_init_aggr(struct ipa_endpoint *endpoint)
  * represents the given number of microseconds.  The result
  * includes both the timer value and the selected timer granularity.
  */
-static u32 hol_block_timer_qtime_val(struct ipa *ipa, u32 microseconds)
+static u32 hol_block_timer_qtime_encode(struct ipa *ipa, u32 microseconds)
 {
 	u32 gran_sel;
 	u32 val;
+	int ret;
 
-	/* IPA v4.5 expresses time limits using Qtime.  The AP has
-	 * pulse generators 0 and 1 available, which were configured
-	 * in ipa_qtime_config() to have granularity 100 usec and
-	 * 1 msec, respectively.  Use pulse generator 0 if possible,
-	 * otherwise fall back to pulse generator 1.
-	 */
-	val = DIV_ROUND_CLOSEST(microseconds, 100);
-	if (val > field_max(TIME_LIMIT_FMASK)) {
-		/* Have to use pulse generator 1 (millisecond granularity) */
+	ret = ipa_qtime_val(microseconds, field_max(TIME_LIMIT_FMASK));
+	if (ret < 0) {
+		val = -ret;
 		gran_sel = GRAN_SEL_FMASK;
-		val = DIV_ROUND_CLOSEST(microseconds, 1000);
 	} else {
-		/* We can use pulse generator 0 (100 usec granularity) */
+		val = ret;
 		gran_sel = 0;
 	}
 
@@ -854,12 +864,10 @@ static u32 hol_block_timer_qtime_val(struct ipa *ipa, u32 microseconds)
  * derived from the 19.2 MHz SoC XO clock.  For older IPA versions
  * each tick represents 128 cycles of the IPA core clock.
  *
- * Return the encoded value that should be written to that register
- * that represents the timeout period provided.  For IPA v4.2 this
- * encodes a base and scale value, while for earlier versions the
- * value is a simple tick count.
+ * Return the encoded value representing the timeout period provided
+ * that should be written to the ENDP_INIT_HOL_BLOCK_TIMER register.
  */
-static u32 hol_block_timer_val(struct ipa *ipa, u32 microseconds)
+static u32 hol_block_timer_encode(struct ipa *ipa, u32 microseconds)
 {
 	u32 width;
 	u32 scale;
@@ -872,7 +880,7 @@ static u32 hol_block_timer_val(struct ipa *ipa, u32 microseconds)
 		return 0;	/* Nothing to compute if timer period is 0 */
 
 	if (ipa->version >= IPA_VERSION_4_5)
-		return hol_block_timer_qtime_val(ipa, microseconds);
+		return hol_block_timer_qtime_encode(ipa, microseconds);
 
 	/* Use 64 bit arithmetic to avoid overflow... */
 	rate = ipa_core_clock_rate(ipa);
@@ -920,7 +928,7 @@ static void ipa_endpoint_init_hol_block_timer(struct ipa_endpoint *endpoint,
 
 	/* This should only be changed when HOL_BLOCK_EN is disabled */
 	offset = IPA_REG_ENDP_INIT_HOL_BLOCK_TIMER_N_OFFSET(endpoint_id);
-	val = hol_block_timer_val(ipa, microseconds);
+	val = hol_block_timer_encode(ipa, microseconds);
 	iowrite32(val, ipa->reg_virt + offset);
 }
 
-- 
2.34.1

[PATCH net-next 3/8] net: ipa: rearrange functions for similarity

[Alex Elder]

Both aggr_time_limit_encode() and hol_block_timer_encode() figure
out how to encode a millisecond time value so it can be programmed
into a register.  Rearranging them a bit can make their similarity
more obvious, with both taking essentially the same form.

To do this:
  - Return 0 immediately in aggr_time_limit_encode() if the
    microseconds value supplied is zero.
  - Reverse the test at top of aggr_time_limit_encode(), so we
    compute and return the Qtime value in the "true" block,
    and compute the result the old way otherwise.
  - Open-code (and eliminate) hol_block_timer_qtime_encode() at the
    top of hol_block_timer_encode() in the case we use Qtimer.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 86 ++++++++++++++++------------------
 1 file changed, 41 insertions(+), 45 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 7d91b423a1be7..6db62b6fb6632 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -752,34 +752,38 @@ static int ipa_qtime_val(u32 microseconds, u32 max)
 /* Encode the aggregation timer limit (microseconds) based on IPA version */
 static u32 aggr_time_limit_encode(enum ipa_version version, u32 microseconds)
 {
-	u32 gran_sel;
 	u32 fmask;
 	u32 val;
-	int ret;
 
-	if (version < IPA_VERSION_4_5) {
-		/* We set aggregation granularity in ipa_hardware_config() */
-		fmask = aggr_time_limit_fmask(true);
-		val = DIV_ROUND_CLOSEST(microseconds, IPA_AGGR_GRANULARITY);
-		WARN(val > field_max(fmask),
-		     "aggr_time_limit too large (%u > %u usec)\n",
-		     val, field_max(fmask) * IPA_AGGR_GRANULARITY);
+	if (!microseconds)
+		return 0;	/* Nothing to compute if time limit is 0 */
 
-		return u32_encode_bits(val, fmask);
-	}
+	if (version >= IPA_VERSION_4_5) {
+		u32 gran_sel;
+		int ret;
+
+		/* Compute the Qtime limit value to use */
+		fmask = aggr_time_limit_fmask(false);
+		ret = ipa_qtime_val(microseconds, field_max(fmask));
+		if (ret < 0) {
+			val = -ret;
+			gran_sel = AGGR_GRAN_SEL_FMASK;
+		} else {
+			val = ret;
+			gran_sel = 0;
+		}
 
-	/* Compute the Qtime limit value to use */
-	fmask = aggr_time_limit_fmask(false);
-	ret = ipa_qtime_val(microseconds, field_max(fmask));
-	if (ret < 0) {
-		val = -ret;
-		gran_sel = AGGR_GRAN_SEL_FMASK;
-	} else {
-		val = ret;
-		gran_sel = 0;
+		return gran_sel | u32_encode_bits(val, fmask);
 	}
 
-	return gran_sel | u32_encode_bits(val, fmask);
+	/* We set aggregation granularity in ipa_hardware_config() */
+	fmask = aggr_time_limit_fmask(true);
+	val = DIV_ROUND_CLOSEST(microseconds, IPA_AGGR_GRANULARITY);
+	WARN(val > field_max(fmask),
+	     "aggr_time_limit too large (%u > %u usec)\n",
+	     val, field_max(fmask) * IPA_AGGR_GRANULARITY);
+
+	return u32_encode_bits(val, fmask);
 }
 
 static u32 aggr_sw_eof_active_encoded(enum ipa_version version, bool enabled)
@@ -837,28 +841,6 @@ static void ipa_endpoint_init_aggr(struct ipa_endpoint *endpoint)
 	iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
 
-/* Return the Qtime-based head-of-line blocking timer value that
- * represents the given number of microseconds.  The result
- * includes both the timer value and the selected timer granularity.
- */
-static u32 hol_block_timer_qtime_encode(struct ipa *ipa, u32 microseconds)
-{
-	u32 gran_sel;
-	u32 val;
-	int ret;
-
-	ret = ipa_qtime_val(microseconds, field_max(TIME_LIMIT_FMASK));
-	if (ret < 0) {
-		val = -ret;
-		gran_sel = GRAN_SEL_FMASK;
-	} else {
-		val = ret;
-		gran_sel = 0;
-	}
-
-	return gran_sel | u32_encode_bits(val, TIME_LIMIT_FMASK);
-}
-
 /* The head-of-line blocking timer is defined as a tick count.  For
  * IPA version 4.5 the tick count is based on the Qtimer, which is
  * derived from the 19.2 MHz SoC XO clock.  For older IPA versions
@@ -879,8 +861,22 @@ static u32 hol_block_timer_encode(struct ipa *ipa, u32 microseconds)
 	if (!microseconds)
 		return 0;	/* Nothing to compute if timer period is 0 */
 
-	if (ipa->version >= IPA_VERSION_4_5)
-		return hol_block_timer_qtime_encode(ipa, microseconds);
+	if (ipa->version >= IPA_VERSION_4_5) {
+		u32 gran_sel;
+		int ret;
+
+		/* Compute the Qtime limit value to use */
+		ret = ipa_qtime_val(microseconds, field_max(TIME_LIMIT_FMASK));
+		if (ret < 0) {
+			val = -ret;
+			gran_sel = GRAN_SEL_FMASK;
+		} else {
+			val = ret;
+			gran_sel = 0;
+		}
+
+		return gran_sel | u32_encode_bits(val, TIME_LIMIT_FMASK);
+	}
 
 	/* Use 64 bit arithmetic to avoid overflow... */
 	rate = ipa_core_clock_rate(ipa);
-- 
2.34.1

[PATCH net-next 4/8] net: ipa: define BCR values using an enum

[Alex Elder]

The backward compatibility register (BCR) has a set of bit flags
that indicate ways in which the IPA hardware should operate in a
backward compatible way.  The register is not supported starting
with IPA v4.5, and where it is supported, defined bits all have the
same numeric value.

Redefine these flags using an enumerated type, with each member's
value representing the bit position that encodes it in the BCR.
This replaces all of the single-bit field masks previously defined.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/data/ipa_data-v3.1.c   |  2 +-
 drivers/net/ipa/data/ipa_data-v3.5.1.c | 10 +++++-----
 drivers/net/ipa/ipa_reg.h              | 26 ++++++++++++--------------
 3 files changed, 18 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ipa/data/ipa_data-v3.1.c b/drivers/net/ipa/data/ipa_data-v3.1.c
index 1c1895aea8118..e0d71f6092729 100644
--- a/drivers/net/ipa/data/ipa_data-v3.1.c
+++ b/drivers/net/ipa/data/ipa_data-v3.1.c
@@ -526,7 +526,7 @@ static const struct ipa_power_data ipa_power_data = {
 /* Configuration data for an SoC having IPA v3.1 */
 const struct ipa_data ipa_data_v3_1 = {
 	.version	= IPA_VERSION_3_1,
-	.backward_compat = BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK,
+	.backward_compat = BIT(BCR_CMDQ_L_LACK_ONE_ENTRY),
 	.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/data/ipa_data-v3.5.1.c b/drivers/net/ipa/data/ipa_data-v3.5.1.c
index 58b708d2fc75d..383ef18900654 100644
--- a/drivers/net/ipa/data/ipa_data-v3.5.1.c
+++ b/drivers/net/ipa/data/ipa_data-v3.5.1.c
@@ -407,11 +407,11 @@ static const struct ipa_power_data ipa_power_data = {
 /* Configuration data for an SoC having IPA v3.5.1 */
 const struct ipa_data ipa_data_v3_5_1 = {
 	.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,
+	.backward_compat = BIT(BCR_CMDQ_L_LACK_ONE_ENTRY) |
+			   BIT(BCR_TX_NOT_USING_BRESP) |
+			   BIT(BCR_SUSPEND_L2_IRQ) |
+			   BIT(BCR_HOLB_DROP_L2_IRQ) |
+			   BIT(BCR_DUAL_TX),
 	.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_reg.h b/drivers/net/ipa/ipa_reg.h
index 3e24bddc682ef..2aa1d1dd0adf5 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -220,20 +220,18 @@ static inline u32 ipa_reg_state_aggr_active_offset(enum ipa_version version)
 
 /* The next register is not present for IPA v4.5+ */
 #define IPA_REG_BCR_OFFSET				0x000001d0
-/* The next two fields are not present for IPA v4.2+ */
-#define BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK		GENMASK(0, 0)
-#define BCR_TX_NOT_USING_BRESP_FMASK		GENMASK(1, 1)
-/* The next field is invalid for IPA v4.0+ */
-#define BCR_TX_SUSPEND_IRQ_ASSERT_ONCE_FMASK	GENMASK(2, 2)
-/* The next two fields are not present for IPA v4.2+ */
-#define BCR_SUSPEND_L2_IRQ_FMASK		GENMASK(3, 3)
-#define BCR_HOLB_DROP_L2_IRQ_FMASK		GENMASK(4, 4)
-/* The next five fields are present for IPA v3.5+ */
-#define BCR_DUAL_TX_FMASK			GENMASK(5, 5)
-#define BCR_ENABLE_FILTER_DATA_CACHE_FMASK	GENMASK(6, 6)
-#define BCR_NOTIF_PRIORITY_OVER_ZLT_FMASK	GENMASK(7, 7)
-#define BCR_FILTER_PREFETCH_EN_FMASK		GENMASK(8, 8)
-#define BCR_ROUTER_PREFETCH_EN_FMASK		GENMASK(9, 9)
+enum ipa_bcr_compat {
+	BCR_CMDQ_L_LACK_ONE_ENTRY		= 0x0,	/* Not IPA v4.2+ */
+	BCR_TX_NOT_USING_BRESP			= 0x1,	/* Not IPA v4.2+ */
+	BCR_TX_SUSPEND_IRQ_ASSERT_ONCE		= 0x2,	/* Not IPA v4.0+ */
+	BCR_SUSPEND_L2_IRQ			= 0x3,	/* Not IPA v4.2+ */
+	BCR_HOLB_DROP_L2_IRQ			= 0x4,	/* Not IPA v4.2+ */
+	BCR_DUAL_TX				= 0x5,	/* IPA v3.5+ */
+	BCR_ENABLE_FILTER_DATA_CACHE		= 0x6,	/* IPA v3.5+ */
+	BCR_NOTIF_PRIORITY_OVER_ZLT		= 0x7,	/* IPA v3.5+ */
+	BCR_FILTER_PREFETCH_EN			= 0x8,	/* IPA v3.5+ */
+	BCR_ROUTER_PREFETCH_EN			= 0x9,	/* IPA v3.5+ */
+};
 
 /* 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
-- 
2.34.1

[PATCH net-next 5/8] net: ipa: tidy up register enum definitions

[Alex Elder]

Update a few enumerated type definitions in "ipa_reg.h" so that the
values assigned to each member align on the same column.  Where a
"TX" or "RX" (or both) comment is present, move that annotation into
a separate comment between the member name and its value.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_reg.h | 42 +++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
index 2aa1d1dd0adf5..f593cf3187950 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -363,10 +363,10 @@ enum ipa_pulse_gran {
 
 /** enum ipa_cs_offload_en - ENDP_INIT_CFG register CS_OFFLOAD_EN field value */
 enum ipa_cs_offload_en {
-	IPA_CS_OFFLOAD_NONE		= 0x0,
-	IPA_CS_OFFLOAD_UL		= 0x1,	/* Before IPA v4.5 (TX) */
-	IPA_CS_OFFLOAD_DL		= 0x2,	/* Before IPA v4.5 (RX) */
-	IPA_CS_OFFLOAD_INLINE		= 0x1,	/* IPA v4.5 (TX and RX) */
+	IPA_CS_OFFLOAD_NONE			= 0x0,
+	IPA_CS_OFFLOAD_UL	/* TX */	= 0x1,	/* Not IPA v4.5+ */
+	IPA_CS_OFFLOAD_DL	/* RX */	= 0x2,	/* Not IPA v4.5+ */
+	IPA_CS_OFFLOAD_INLINE	/* TX and RX */	= 0x1,	/* IPA v4.5+ */
 };
 
 /* Valid only for TX (IPA consumer) endpoints */
@@ -376,9 +376,9 @@ enum ipa_cs_offload_en {
 
 /** enum ipa_nat_en - ENDP_INIT_NAT register NAT_EN field value */
 enum ipa_nat_en {
-	IPA_NAT_BYPASS			= 0x0,
-	IPA_NAT_SRC			= 0x1,
-	IPA_NAT_DST			= 0x2,
+	IPA_NAT_BYPASS				= 0x0,
+	IPA_NAT_SRC				= 0x1,
+	IPA_NAT_DST				= 0x2,
 };
 
 #define IPA_REG_ENDP_INIT_HDR_N_OFFSET(ep) \
@@ -472,10 +472,10 @@ static inline u32 ipa_metadata_offset_encoded(enum ipa_version version,
 
 /** enum ipa_mode - ENDP_INIT_MODE register MODE field value */
 enum ipa_mode {
-	IPA_BASIC			= 0x0,
-	IPA_ENABLE_FRAMING_HDLC		= 0x1,
-	IPA_ENABLE_DEFRAMING_HDLC	= 0x2,
-	IPA_DMA				= 0x3,
+	IPA_BASIC				= 0x0,
+	IPA_ENABLE_FRAMING_HDLC			= 0x1,
+	IPA_ENABLE_DEFRAMING_HDLC		= 0x2,
+	IPA_DMA					= 0x3,
 };
 
 #define IPA_REG_ENDP_INIT_AGGR_N_OFFSET(ep) \
@@ -524,20 +524,20 @@ static inline u32 aggr_hard_byte_limit_enable_fmask(bool legacy)
 
 /** enum ipa_aggr_en - ENDP_INIT_AGGR register AGGR_EN field value */
 enum ipa_aggr_en {
-	IPA_BYPASS_AGGR			= 0x0,	/* (TX, RX) */
-	IPA_ENABLE_AGGR			= 0x1,	/* (RX) */
-	IPA_ENABLE_DEAGGR		= 0x2,	/* (TX) */
+	IPA_BYPASS_AGGR		/* TX and RX */	= 0x0,
+	IPA_ENABLE_AGGR		/* RX */	= 0x1,
+	IPA_ENABLE_DEAGGR	/* TX */	= 0x2,
 };
 
 /** enum ipa_aggr_type - ENDP_INIT_AGGR register AGGR_TYPE field value */
 enum ipa_aggr_type {
-	IPA_MBIM_16			= 0x0,
-	IPA_HDLC			= 0x1,
-	IPA_TLP				= 0x2,
-	IPA_RNDIS			= 0x3,
-	IPA_GENERIC			= 0x4,
-	IPA_COALESCE			= 0x5,
-	IPA_QCMAP			= 0x6,
+	IPA_MBIM_16				= 0x0,
+	IPA_HDLC				= 0x1,
+	IPA_TLP					= 0x2,
+	IPA_RNDIS				= 0x3,
+	IPA_GENERIC				= 0x4,
+	IPA_COALESCE				= 0x5,
+	IPA_QCMAP				= 0x6,
 };
 
 /* Valid only for RX (IPA producer) endpoints */
-- 
2.34.1

[PATCH net-next 6/8] net: ipa: encapsulate setting the FILT_ROUT_HASH_EN register

[Alex Elder]

Create a new function that encapsulates setting the register flag
that disables filter and routing table hashing for IPA v4.2.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_main.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 9dfa7f58a207f..cca270d2d9a68 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -306,6 +306,18 @@ static void ipa_qtime_config(struct ipa *ipa)
 	iowrite32(val, ipa->reg_virt + IPA_REG_TIMERS_XO_CLK_DIV_CFG_OFFSET);
 }
 
+static void ipa_hardware_config_hashing(struct ipa *ipa)
+{
+	u32 offset;
+
+	if (ipa->version != IPA_VERSION_4_2)
+		return;
+
+	/* IPA v4.2 does not support hashed tables, so disable them */
+	offset = ipa_reg_filt_rout_hash_en_offset(IPA_VERSION_4_2);
+	iowrite32(0, ipa->reg_virt + offset);
+}
+
 static void ipa_idle_indication_cfg(struct ipa *ipa,
 				    u32 enter_idle_debounce_thresh,
 				    bool const_non_idle_enable)
@@ -390,14 +402,7 @@ static void ipa_hardware_config(struct ipa *ipa, const struct ipa_data *data)
 		ipa_qtime_config(ipa);
 	}
 
-	/* IPA v4.2 does not support hashed tables, so disable them */
-	if (version == IPA_VERSION_4_2) {
-		u32 offset = ipa_reg_filt_rout_hash_en_offset(version);
-
-		iowrite32(0, ipa->reg_virt + offset);
-	}
-
-	/* Enable dynamic clock division */
+	ipa_hardware_config_hashing(ipa);
 	ipa_hardware_dcd_config(ipa);
 }
 
-- 
2.34.1

[PATCH net-next 7/8] net: ipa: encapsulate updating the COUNTER_CFG register

[Alex Elder]

Create a new function that encapsulates setting the counter
configuration register value for versions prior to IPA v4.5.
Create another small function to represent configuring hardware
timing regardless of version.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_main.c | 35 ++++++++++++++++++++++-------------
 1 file changed, 22 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index cca270d2d9a68..8bb4b036df2b4 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -306,6 +306,27 @@ static void ipa_qtime_config(struct ipa *ipa)
 	iowrite32(val, ipa->reg_virt + IPA_REG_TIMERS_XO_CLK_DIV_CFG_OFFSET);
 }
 
+/* Before IPA v4.5 timing is controlled by a counter register */
+static void ipa_hardware_config_counter(struct ipa *ipa)
+{
+	u32 granularity;
+	u32 val;
+
+	granularity = ipa_aggr_granularity_val(IPA_AGGR_GRANULARITY);
+
+	val = u32_encode_bits(granularity, AGGR_GRANULARITY_FMASK);
+
+	iowrite32(val, ipa->reg_virt + IPA_REG_COUNTER_CFG_OFFSET);
+}
+
+static void ipa_hardware_config_timing(struct ipa *ipa)
+{
+	if (ipa->version < IPA_VERSION_4_5)
+		ipa_hardware_config_counter(ipa);
+	else
+		ipa_qtime_config(ipa);
+}
+
 static void ipa_hardware_config_hashing(struct ipa *ipa)
 {
 	u32 offset;
@@ -362,7 +383,6 @@ static void ipa_hardware_dcd_deconfig(struct ipa *ipa)
 static void ipa_hardware_config(struct ipa *ipa, const struct ipa_data *data)
 {
 	enum ipa_version version = ipa->version;
-	u32 granularity;
 	u32 val;
 
 	/* IPA v4.5+ has no backward compatibility register */
@@ -389,19 +409,8 @@ static void ipa_hardware_config(struct ipa *ipa, const struct ipa_data *data)
 		iowrite32(val, ipa->reg_virt + IPA_REG_CLKON_CFG_OFFSET);
 
 	ipa_hardware_config_comp(ipa);
-
-	/* Configure system bus limits */
 	ipa_hardware_config_qsb(ipa, data);
-
-	if (version < IPA_VERSION_4_5) {
-		/* Configure aggregation timer granularity */
-		granularity = ipa_aggr_granularity_val(IPA_AGGR_GRANULARITY);
-		val = u32_encode_bits(granularity, AGGR_GRANULARITY_FMASK);
-		iowrite32(val, ipa->reg_virt + IPA_REG_COUNTER_CFG_OFFSET);
-	} else {
-		ipa_qtime_config(ipa);
-	}
-
+	ipa_hardware_config_timing(ipa);
 	ipa_hardware_config_hashing(ipa);
 	ipa_hardware_dcd_config(ipa);
 }
-- 
2.34.1

[PATCH net-next 8/8] net: ipa: encapsulate updating three more registers

[Alex Elder]

Create a new function that encapsulates setting the BCR, TX_CFG, and
CLKON_CFG register values during hardware configuration.

Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_main.c | 79 +++++++++++++++++++++++++-------------
 1 file changed, 53 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 8bb4b036df2b4..a552d6edb702d 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -183,6 +183,56 @@ static void ipa_teardown(struct ipa *ipa)
 	gsi_teardown(&ipa->gsi);
 }
 
+static void
+ipa_hardware_config_bcr(struct ipa *ipa, const struct ipa_data *data)
+{
+	u32 val;
+
+	/* IPA v4.5+ has no backward compatibility register */
+	if (ipa->version >= IPA_VERSION_4_5)
+		return;
+
+	val = data->backward_compat;
+	iowrite32(val, ipa->reg_virt + IPA_REG_BCR_OFFSET);
+}
+
+static void ipa_hardware_config_tx(struct ipa *ipa)
+{
+	enum ipa_version version = ipa->version;
+	u32 val;
+
+	if (version <= IPA_VERSION_4_0 || version >= IPA_VERSION_4_5)
+		return;
+
+	/* Disable PA mask to allow HOLB drop */
+	val = ioread32(ipa->reg_virt + IPA_REG_TX_CFG_OFFSET);
+
+	val &= ~PA_MASK_EN_FMASK;
+
+	iowrite32(val, ipa->reg_virt + IPA_REG_TX_CFG_OFFSET);
+}
+
+static void ipa_hardware_config_clkon(struct ipa *ipa)
+{
+	enum ipa_version version = ipa->version;
+	u32 val;
+
+	if (version < IPA_VERSION_3_1 || version >= IPA_VERSION_4_5)
+		return;
+
+	/* Implement some hardware workarounds */
+	if (version >= IPA_VERSION_4_0) {
+		/* Enable open global clocks in the CLKON configuration */
+		val = GLOBAL_FMASK | GLOBAL_2X_CLK_FMASK;
+	} else if (version == IPA_VERSION_3_1) {
+		val = MISC_FMASK;	/* Disable MISC clock gating */
+	} else {
+		return;
+	}
+
+	iowrite32(val, ipa->reg_virt + IPA_REG_CLKON_CFG_OFFSET);
+}
+
 /* Configure bus access behavior for IPA components */
 static void ipa_hardware_config_comp(struct ipa *ipa)
 {
@@ -382,32 +432,9 @@ static void ipa_hardware_dcd_deconfig(struct ipa *ipa)
  */
 static void ipa_hardware_config(struct ipa *ipa, const struct ipa_data *data)
 {
-	enum ipa_version version = ipa->version;
-	u32 val;
-
-	/* IPA v4.5+ has no backward compatibility register */
-	if (version < IPA_VERSION_4_5) {
-		val = data->backward_compat;
-		iowrite32(val, ipa->reg_virt + IPA_REG_BCR_OFFSET);
-	}
-
-	/* Implement some hardware workarounds */
-	if (version >= IPA_VERSION_4_0 && version < IPA_VERSION_4_5) {
-		/* Disable PA mask to allow HOLB drop */
-		val = ioread32(ipa->reg_virt + IPA_REG_TX_CFG_OFFSET);
-		val &= ~PA_MASK_EN_FMASK;
-		iowrite32(val, ipa->reg_virt + IPA_REG_TX_CFG_OFFSET);
-
-		/* Enable open global clocks in the CLKON configuration */
-		val = GLOBAL_FMASK | GLOBAL_2X_CLK_FMASK;
-	} else if (version == IPA_VERSION_3_1) {
-		val = MISC_FMASK;	/* Disable MISC clock gating */
-	} else {
-		val = 0;		/* No CLKON configuration needed */
-	}
-	if (val)
-		iowrite32(val, ipa->reg_virt + IPA_REG_CLKON_CFG_OFFSET);
-
+	ipa_hardware_config_bcr(ipa, data);
+	ipa_hardware_config_tx(ipa);
+	ipa_hardware_config_clkon(ipa);
 	ipa_hardware_config_comp(ipa);
 	ipa_hardware_config_qsb(ipa, data);
 	ipa_hardware_config_timing(ipa);
-- 
2.34.1

Re: [PATCH net-next 0/8] net: ipa: another set of cleanups

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 22 Sep 2022 17:20:52 -0500 you wrote:
> This series contains another set of cleanups done in preparation for
> an upcoming series that reworks how IPA registers and their fields
> are defined.
> 
> The first replaces the use of u32_replace_bits() with a simple
> logical AND operation in two places.
> 
> [...]

Here is the summary with links:
  - [net-next,1/8] net: ipa: don't use u32p_replace_bits()
    https://git.kernel.org/netdev/net-next/c/a50d37b7565e
  - [net-next,2/8] net: ipa: introduce ipa_qtime_val()
    https://git.kernel.org/netdev/net-next/c/8be440e17bdb
  - [net-next,3/8] net: ipa: rearrange functions for similarity
    (no matching commit)
  - [net-next,4/8] net: ipa: define BCR values using an enum
    https://git.kernel.org/netdev/net-next/c/21ab2078ff37
  - [net-next,5/8] net: ipa: tidy up register enum definitions
    https://git.kernel.org/netdev/net-next/c/73e0c9efb5ed
  - [net-next,6/8] net: ipa: encapsulate setting the FILT_ROUT_HASH_EN register
    https://git.kernel.org/netdev/net-next/c/b24627b1d9b2
  - [net-next,7/8] net: ipa: encapsulate updating the COUNTER_CFG register
    https://git.kernel.org/netdev/net-next/c/1e5db0965ef5
  - [net-next,8/8] net: ipa: encapsulate updating three more registers
    https://git.kernel.org/netdev/net-next/c/92073b1648cb

You are awesome, thank you!
-- 
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