Merge branch 'net-ipa-gsi-register-consolidation'

Alex Elder says:

====================
net: ipa: GSI register consolidation

This series rearranges and consolidates some GSI register
definitions.  Its general aim is to make things more
consistent, by:
  - Using enumerated types to define the values held in GSI register
    fields
  - Defining field values in "gsi_reg.h", together with the
    definition of the register (and field) that holds them
  - Format enumerated type members consistently, with hexidecimal
    numeric values, and assignments aligned on the same column

There is one checkpatch "CHECK" warning requesting a blank line; I
ignored that because my intention was to group certain definitions.
====================

Link: https://lore.kernel.org/r/20201110215922.23514-1-elder@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 93 insertions, 91 deletions

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 3a5998a037da..55151960a698 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -109,62 +109,6 @@ struct gsi_event {
 	u8 chid;
 };
 
-/* Hardware values from the error log register error code field */
-enum gsi_err_code {
-	GSI_INVALID_TRE_ERR			= 0x1,
-	GSI_OUT_OF_BUFFERS_ERR			= 0x2,
-	GSI_OUT_OF_RESOURCES_ERR		= 0x3,
-	GSI_UNSUPPORTED_INTER_EE_OP_ERR		= 0x4,
-	GSI_EVT_RING_EMPTY_ERR			= 0x5,
-	GSI_NON_ALLOCATED_EVT_ACCESS_ERR	= 0x6,
-	GSI_HWO_1_ERR				= 0x8,
-};
-
-/* Hardware values from the error log register error type field */
-enum gsi_err_type {
-	GSI_ERR_TYPE_GLOB	= 0x1,
-	GSI_ERR_TYPE_CHAN	= 0x2,
-	GSI_ERR_TYPE_EVT	= 0x3,
-};
-
-/* Hardware values used when programming an event ring */
-enum gsi_evt_chtype {
-	GSI_EVT_CHTYPE_MHI_EV	= 0x0,
-	GSI_EVT_CHTYPE_XHCI_EV	= 0x1,
-	GSI_EVT_CHTYPE_GPI_EV	= 0x2,
-	GSI_EVT_CHTYPE_XDCI_EV	= 0x3,
-};
-
-/* Hardware values used when programming a channel */
-enum gsi_channel_protocol {
-	GSI_CHANNEL_PROTOCOL_MHI	= 0x0,
-	GSI_CHANNEL_PROTOCOL_XHCI	= 0x1,
-	GSI_CHANNEL_PROTOCOL_GPI	= 0x2,
-	GSI_CHANNEL_PROTOCOL_XDCI	= 0x3,
-};
-
-/* Hardware values representing an event ring immediate command opcode */
-enum gsi_evt_cmd_opcode {
-	GSI_EVT_ALLOCATE	= 0x0,
-	GSI_EVT_RESET		= 0x9,
-	GSI_EVT_DE_ALLOC	= 0xa,
-};
-
-/* Hardware values representing a generic immediate command opcode */
-enum gsi_generic_cmd_opcode {
-	GSI_GENERIC_HALT_CHANNEL	= 0x1,
-	GSI_GENERIC_ALLOCATE_CHANNEL	= 0x2,
-};
-
-/* Hardware values representing a channel immediate command opcode */
-enum gsi_ch_cmd_opcode {
-	GSI_CH_ALLOCATE	= 0x0,
-	GSI_CH_START	= 0x1,
-	GSI_CH_STOP	= 0x2,
-	GSI_CH_RESET	= 0x9,
-	GSI_CH_DE_ALLOC	= 0xa,
-};
-
 /** gsi_channel_scratch_gpi - GPI protocol scratch register
  * @max_outstanding_tre:
  *	Defines the maximum number of TREs allowed in a single transaction
@@ -305,7 +249,7 @@ static void gsi_irq_enable(struct gsi *gsi)
 	/* Global interrupts include hardware error reports.  Enable
 	 * that so we can at least report the error should it occur.
 	 */
-	iowrite32(ERROR_INT_FMASK, gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
+	iowrite32(BIT(ERROR_INT), gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
 	gsi_irq_type_update(gsi, gsi->type_enabled_bitmap | BIT(GSI_GLOB_EE));
 
 	/* General GSI interrupts are reported to all EEs; if they occur
@@ -313,9 +257,9 @@ static void gsi_irq_enable(struct gsi *gsi)
 	 * also exists, but we don't support that.  We want to be notified
 	 * of errors so we can report them, even if they can't be handled.
 	 */
-	val = BUS_ERROR_FMASK;
-	val |= CMD_FIFO_OVRFLOW_FMASK;
-	val |= MCS_STACK_OVRFLOW_FMASK;
+	val = BIT(BUS_ERROR);
+	val |= BIT(CMD_FIFO_OVRFLOW);
+	val |= BIT(MCS_STACK_OVRFLOW);
 	iowrite32(val, gsi->virt + GSI_CNTXT_GSI_IRQ_EN_OFFSET);
 	gsi_irq_type_update(gsi, gsi->type_enabled_bitmap | BIT(GSI_GENERAL));
 }
@@ -684,7 +628,8 @@ static void gsi_evt_ring_program(struct gsi *gsi, u32 evt_ring_id)
 	size_t size = evt_ring->ring.count * GSI_RING_ELEMENT_SIZE;
 	u32 val;
 
-	val = u32_encode_bits(GSI_EVT_CHTYPE_GPI_EV, EV_CHTYPE_FMASK);
+	/* We program all event rings as GPI type/protocol */
+	val = u32_encode_bits(GSI_CHANNEL_TYPE_GPI, EV_CHTYPE_FMASK);
 	val |= EV_INTYPE_FMASK;
 	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));
@@ -791,8 +736,8 @@ static void gsi_channel_program(struct gsi_channel *channel, bool doorbell)
 	/* Arbitrarily pick TRE 0 as the first channel element to use */
 	channel->tre_ring.index = 0;
 
-	/* We program all channels to use GPI protocol */
-	val = u32_encode_bits(GSI_CHANNEL_PROTOCOL_GPI, CHTYPE_PROTOCOL_FMASK);
+	/* We program all channels as GPI type/protocol */
+	val = u32_encode_bits(GSI_CHANNEL_TYPE_GPI, CHTYPE_PROTOCOL_FMASK);
 	if (channel->toward_ipa)
 		val |= CHTYPE_DIR_FMASK;
 	val |= u32_encode_bits(channel->evt_ring_id, ERINDEX_FMASK);
@@ -1067,7 +1012,7 @@ static void gsi_isr_evt_ctrl(struct gsi *gsi)
 static void
 gsi_isr_glob_chan_err(struct gsi *gsi, u32 err_ee, u32 channel_id, u32 code)
 {
-	if (code == GSI_OUT_OF_RESOURCES_ERR) {
+	if (code == GSI_OUT_OF_RESOURCES) {
 		dev_err(gsi->dev, "channel %u out of resources\n", channel_id);
 		complete(&gsi->channel[channel_id].completion);
 		return;
@@ -1082,7 +1027,7 @@ gsi_isr_glob_chan_err(struct gsi *gsi, u32 err_ee, u32 channel_id, u32 code)
 static void
 gsi_isr_glob_evt_err(struct gsi *gsi, u32 err_ee, u32 evt_ring_id, u32 code)
 {
-	if (code == GSI_OUT_OF_RESOURCES_ERR) {
+	if (code == GSI_OUT_OF_RESOURCES) {
 		struct gsi_evt_ring *evt_ring = &gsi->evt_ring[evt_ring_id];
 		u32 channel_id = gsi_channel_id(evt_ring->channel);
 
@@ -1132,7 +1077,7 @@ static void gsi_isr_gp_int1(struct gsi *gsi)
 
 	val = ioread32(gsi->virt + GSI_CNTXT_SCRATCH_0_OFFSET);
 	result = u32_get_bits(val, GENERIC_EE_RESULT_FMASK);
-	if (result != GENERIC_EE_SUCCESS_FVAL)
+	if (result != GENERIC_EE_SUCCESS)
 		dev_err(gsi->dev, "global INT1 generic result %u\n", result);
 
 	complete(&gsi->completion);
@@ -1145,15 +1090,15 @@ static void gsi_isr_glob_ee(struct gsi *gsi)
 
 	val = ioread32(gsi->virt + GSI_CNTXT_GLOB_IRQ_STTS_OFFSET);
 
-	if (val & ERROR_INT_FMASK)
+	if (val & BIT(ERROR_INT))
 		gsi_isr_glob_err(gsi);
 
 	iowrite32(val, gsi->virt + GSI_CNTXT_GLOB_IRQ_CLR_OFFSET);
 
-	val &= ~ERROR_INT_FMASK;
+	val &= ~BIT(ERROR_INT);
 
-	if (val & GP_INT1_FMASK) {
-		val ^= GP_INT1_FMASK;
+	if (val & BIT(GP_INT1)) {
+		val ^= BIT(GP_INT1);
 		gsi_isr_gp_int1(gsi);
 	}
 
@@ -1626,7 +1571,7 @@ static int gsi_generic_command(struct gsi *gsi, u32 channel_id,
 	 * halt a modem channel) and only from this function.  So we
 	 * enable the GP_INT1 IRQ type here while we're expecting it.
 	 */
-	val = ERROR_INT_FMASK | GP_INT1_FMASK;
+	val = BIT(ERROR_INT) | BIT(GP_INT1);
 	iowrite32(val, gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
 
 	/* First zero the result code field */
@@ -1642,7 +1587,7 @@ static int gsi_generic_command(struct gsi *gsi, u32 channel_id,
 	success = gsi_command(gsi, GSI_GENERIC_CMD_OFFSET, val, completion);
 
 	/* Disable the GP_INT1 IRQ type again */
-	iowrite32(ERROR_INT_FMASK, gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
+	iowrite32(BIT(ERROR_INT), gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
 
 	if (success)
 		return 0;
diff --git a/drivers/net/ipa/gsi_reg.h b/drivers/net/ipa/gsi_reg.h
index c50464984c6e..8e3a7ffd1947 100644
--- a/drivers/net/ipa/gsi_reg.h
+++ b/drivers/net/ipa/gsi_reg.h
@@ -71,6 +71,13 @@
 #define ERINDEX_FMASK			GENMASK(18, 14)
 #define CHSTATE_FMASK			GENMASK(23, 20)
 #define ELEMENT_SIZE_FMASK		GENMASK(31, 24)
+/** enum gsi_channel_type - CHTYPE_PROTOCOL field values in CH_C_CNTXT_0 */
+enum gsi_channel_type {
+	GSI_CHANNEL_TYPE_MHI			= 0x0,
+	GSI_CHANNEL_TYPE_XHCI			= 0x1,
+	GSI_CHANNEL_TYPE_GPI			= 0x2,
+	GSI_CHANNEL_TYPE_XDCI			= 0x3,
+};
 
 #define GSI_CH_C_CNTXT_1_OFFSET(ch) \
 		GSI_EE_N_CH_C_CNTXT_1_OFFSET((ch), GSI_EE_AP)
@@ -128,6 +135,7 @@
 #define EV_INTYPE_FMASK			GENMASK(16, 16)
 #define EV_CHSTATE_FMASK		GENMASK(23, 20)
 #define EV_ELEMENT_SIZE_FMASK		GENMASK(31, 24)
+/* enum gsi_channel_type defines EV_CHTYPE field values in EV_CH_E_CNTXT_0 */
 
 #define GSI_EV_CH_E_CNTXT_1_OFFSET(ev) \
 		GSI_EE_N_EV_CH_E_CNTXT_1_OFFSET((ev), GSI_EE_AP)
@@ -215,6 +223,14 @@
 			(0x0001f008 + 0x4000 * (ee))
 #define CH_CHID_FMASK			GENMASK(7, 0)
 #define CH_OPCODE_FMASK			GENMASK(31, 24)
+/** enum gsi_ch_cmd_opcode - CH_OPCODE field values in CH_CMD */
+enum gsi_ch_cmd_opcode {
+	GSI_CH_ALLOCATE				= 0x0,
+	GSI_CH_START				= 0x1,
+	GSI_CH_STOP				= 0x2,
+	GSI_CH_RESET				= 0x9,
+	GSI_CH_DE_ALLOC				= 0xa,
+};
 
 #define GSI_EV_CH_CMD_OFFSET \
 			GSI_EE_N_EV_CH_CMD_OFFSET(GSI_EE_AP)
@@ -222,6 +238,12 @@
 			(0x0001f010 + 0x4000 * (ee))
 #define EV_CHID_FMASK			GENMASK(7, 0)
 #define EV_OPCODE_FMASK			GENMASK(31, 24)
+/** enum gsi_evt_cmd_opcode - EV_OPCODE field values in EV_CH_CMD */
+enum gsi_evt_cmd_opcode {
+	GSI_EVT_ALLOCATE			= 0x0,
+	GSI_EVT_RESET				= 0x9,
+	GSI_EVT_DE_ALLOC			= 0xa,
+};
 
 #define GSI_GENERIC_CMD_OFFSET \
 			GSI_EE_N_GENERIC_CMD_OFFSET(GSI_EE_AP)
@@ -230,17 +252,17 @@
 #define GENERIC_OPCODE_FMASK		GENMASK(4, 0)
 #define GENERIC_CHID_FMASK		GENMASK(9, 5)
 #define GENERIC_EE_FMASK		GENMASK(13, 10)
+/** enum gsi_generic_cmd_opcode - GENERIC_OPCODE field values in GENERIC_CMD */
+enum gsi_generic_cmd_opcode {
+	GSI_GENERIC_HALT_CHANNEL		= 0x1,
+	GSI_GENERIC_ALLOCATE_CHANNEL		= 0x2,
+};
 
 #define GSI_GSI_HW_PARAM_2_OFFSET \
 			GSI_EE_N_GSI_HW_PARAM_2_OFFSET(GSI_EE_AP)
 #define GSI_EE_N_GSI_HW_PARAM_2_OFFSET(ee) \
 			(0x0001f040 + 0x4000 * (ee))
 #define IRAM_SIZE_FMASK			GENMASK(2, 0)
-#define IRAM_SIZE_ONE_KB_FVAL			0
-#define IRAM_SIZE_TWO_KB_FVAL			1
-/* The next two values are available for IPA v4.0 and above */
-#define IRAM_SIZE_TWO_N_HALF_KB_FVAL		2
-#define IRAM_SIZE_THREE_KB_FVAL			3
 #define NUM_CH_PER_EE_FMASK		GENMASK(7, 3)
 #define NUM_EV_PER_EE_FMASK		GENMASK(12, 8)
 #define GSI_CH_PEND_TRANSLATE_FMASK	GENMASK(13, 13)
@@ -253,7 +275,16 @@
 /* Fields below are present for IPA v4.2 and above */
 #define GSI_USE_RD_WR_ENG_FMASK		GENMASK(30, 30)
 #define GSI_USE_INTER_EE_FMASK		GENMASK(31, 31)
+/** enum gsi_iram_size - IRAM_SIZE field values in HW_PARAM_2 */
+enum gsi_iram_size {
+	IRAM_SIZE_ONE_KB			= 0x0,
+	IRAM_SIZE_TWO_KB			= 0x1,
+/* The next two values are available for IPA v4.0 and above */
+	IRAM_SIZE_TWO_N_HALF_KB			= 0x2,
+	IRAM_SIZE_THREE_KB			= 0x3,
+};
 
+/* IRQ condition for each type is cleared by writing type-specific register */
 #define GSI_CNTXT_TYPE_IRQ_OFFSET \
 			GSI_EE_N_CNTXT_TYPE_IRQ_OFFSET(GSI_EE_AP)
 #define GSI_EE_N_CNTXT_TYPE_IRQ_OFFSET(ee) \
@@ -330,11 +361,13 @@ enum gsi_irq_type_id {
 			GSI_EE_N_CNTXT_GLOB_IRQ_CLR_OFFSET(GSI_EE_AP)
 #define GSI_EE_N_CNTXT_GLOB_IRQ_CLR_OFFSET(ee) \
 			(0x0001f110 + 0x4000 * (ee))
-/* The masks below are used for the general IRQ STTS, EN, and CLR registers */
-#define ERROR_INT_FMASK			GENMASK(0, 0)
-#define GP_INT1_FMASK			GENMASK(1, 1)
-#define GP_INT2_FMASK			GENMASK(2, 2)
-#define GP_INT3_FMASK			GENMASK(3, 3)
+/* Values here are bit positions in the GLOB_IRQ_* registers */
+enum gsi_global_irq_id {
+	ERROR_INT				= 0x0,
+	GP_INT1					= 0x1,
+	GP_INT2					= 0x2,
+	GP_INT3					= 0x3,
+};
 
 #define GSI_CNTXT_GSI_IRQ_STTS_OFFSET \
 			GSI_EE_N_CNTXT_GSI_IRQ_STTS_OFFSET(GSI_EE_AP)
@@ -348,11 +381,13 @@ enum gsi_irq_type_id {
 			GSI_EE_N_CNTXT_GSI_IRQ_CLR_OFFSET(GSI_EE_AP)
 #define GSI_EE_N_CNTXT_GSI_IRQ_CLR_OFFSET(ee) \
 			(0x0001f128 + 0x4000 * (ee))
-/* The masks below are used for the general IRQ STTS, EN, and CLR registers */
-#define BREAK_POINT_FMASK		GENMASK(0, 0)
-#define BUS_ERROR_FMASK			GENMASK(1, 1)
-#define CMD_FIFO_OVRFLOW_FMASK		GENMASK(2, 2)
-#define MCS_STACK_OVRFLOW_FMASK		GENMASK(3, 3)
+/* Values here are bit positions in the (general) GSI_IRQ_* registers */
+enum gsi_general_id {
+	BREAK_POINT				= 0x0,
+	BUS_ERROR				= 0x1,
+	CMD_FIFO_OVRFLOW			= 0x2,
+	MCS_STACK_OVRFLOW			= 0x3,
+};
 
 #define GSI_CNTXT_INTSET_OFFSET \
 			GSI_EE_N_CNTXT_INTSET_OFFSET(GSI_EE_AP)
@@ -371,6 +406,23 @@ enum gsi_irq_type_id {
 #define ERR_VIRT_IDX_FMASK		GENMASK(23, 19)
 #define ERR_TYPE_FMASK			GENMASK(27, 24)
 #define ERR_EE_FMASK			GENMASK(31, 28)
+/** enum gsi_err_code - ERR_CODE field values in EE_ERR_LOG */
+enum gsi_err_code {
+	GSI_INVALID_TRE				= 0x1,
+	GSI_OUT_OF_BUFFERS			= 0x2,
+	GSI_OUT_OF_RESOURCES			= 0x3,
+	GSI_UNSUPPORTED_INTER_EE_OP		= 0x4,
+	GSI_EVT_RING_EMPTY			= 0x5,
+	GSI_NON_ALLOCATED_EVT_ACCESS		= 0x6,
+	/* 7 is not assigned */
+	GSI_HWO_1				= 0x8,
+};
+/** enum gsi_err_type - ERR_TYPE field values in EE_ERR_LOG */
+enum gsi_err_type {
+	GSI_ERR_TYPE_GLOB			= 0x1,
+	GSI_ERR_TYPE_CHAN			= 0x2,
+	GSI_ERR_TYPE_EVT			= 0x3,
+};
 
 #define GSI_ERROR_LOG_CLR_OFFSET \
 			GSI_EE_N_ERROR_LOG_CLR_OFFSET(GSI_EE_AP)
@@ -383,10 +435,15 @@ enum gsi_irq_type_id {
 			(0x0001f400 + 0x4000 * (ee))
 #define INTER_EE_RESULT_FMASK		GENMASK(2, 0)
 #define GENERIC_EE_RESULT_FMASK		GENMASK(7, 5)
-#define GENERIC_EE_SUCCESS_FVAL			1
-#define GENERIC_EE_INCORRECT_DIRECTION_FVAL	3
-#define GENERIC_EE_INCORRECT_CHANNEL_FVAL	5
-#define GENERIC_EE_NO_RESOURCES_FVAL		7
+enum gsi_generic_ee_result {
+	GENERIC_EE_SUCCESS			= 0x1,
+	GENERIC_EE_CHANNEL_NOT_RUNNING		= 0x2,
+	GENERIC_EE_INCORRECT_DIRECTION		= 0x3,
+	GENERIC_EE_INCORRECT_CHANNEL_TYPE	= 0x4,
+	GENERIC_EE_INCORRECT_CHANNEL		= 0x5,
+	GENERIC_EE_RETRY			= 0x6,
+	GENERIC_EE_NO_RESOURCES			= 0x7,
+};
 #define USB_MAX_PACKET_FMASK		GENMASK(15, 15)	/* 0: HS; 1: SS */
 #define MHI_BASE_CHANNEL_FMASK		GENMASK(31, 24)