ath10k: add support for shadow register for WNC3990

WCN3990 needs shadow register write operation support
for copy engine for regular operation in powersave mode.
Add support for copy engine shadow register write in
datapath tx for WCN3990

Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath10k/ce.c

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2005-2011 Atheros Communications Inc.
  * Copyright (c) 2011-2017 Qualcomm Atheros, Inc.
+ * Copyright (c) 2018 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -58,6 +59,74 @@
  * the buffer is sent/received.
  */
 
+static inline u32 shadow_sr_wr_ind_addr(struct ath10k *ar,
+					struct ath10k_ce_pipe *ce_state)
+{
+	u32 ce_id = ce_state->id;
+	u32 addr = 0;
+
+	switch (ce_id) {
+	case 0:
+		addr = 0x00032000;
+		break;
+	case 3:
+		addr = 0x0003200C;
+		break;
+	case 4:
+		addr = 0x00032010;
+		break;
+	case 5:
+		addr = 0x00032014;
+		break;
+	case 7:
+		addr = 0x0003201C;
+		break;
+	default:
+		ath10k_warn(ar, "invalid CE id: %d", ce_id);
+		break;
+	}
+	return addr;
+}
+
+static inline u32 shadow_dst_wr_ind_addr(struct ath10k *ar,
+					 struct ath10k_ce_pipe *ce_state)
+{
+	u32 ce_id = ce_state->id;
+	u32 addr = 0;
+
+	switch (ce_id) {
+	case 1:
+		addr = 0x00032034;
+		break;
+	case 2:
+		addr = 0x00032038;
+		break;
+	case 5:
+		addr = 0x00032044;
+		break;
+	case 7:
+		addr = 0x0003204C;
+		break;
+	case 8:
+		addr = 0x00032050;
+		break;
+	case 9:
+		addr = 0x00032054;
+		break;
+	case 10:
+		addr = 0x00032058;
+		break;
+	case 11:
+		addr = 0x0003205C;
+		break;
+	default:
+		ath10k_warn(ar, "invalid CE id: %d", ce_id);
+		break;
+	}
+
+	return addr;
+}
+
 static inline unsigned int
 ath10k_set_ring_byte(unsigned int offset,
 		     struct ath10k_hw_ce_regs_addr_map *addr_map)
@@ -123,6 +192,22 @@ static inline u32 ath10k_ce_src_ring_read_index_get(struct ath10k *ar,
 				ar->hw_ce_regs->current_srri_addr);
 }
 
+static inline void
+ath10k_ce_shadow_src_ring_write_index_set(struct ath10k *ar,
+					  struct ath10k_ce_pipe *ce_state,
+					  unsigned int value)
+{
+	ath10k_ce_write32(ar, shadow_sr_wr_ind_addr(ar, ce_state), value);
+}
+
+static inline void
+ath10k_ce_shadow_dest_ring_write_index_set(struct ath10k *ar,
+					   struct ath10k_ce_pipe *ce_state,
+					   unsigned int value)
+{
+	ath10k_ce_write32(ar, shadow_dst_wr_ind_addr(ar, ce_state), value);
+}
+
 static inline void ath10k_ce_src_ring_base_addr_set(struct ath10k *ar,
 						    u32 ce_ctrl_addr,
 						    unsigned int addr)
@@ -376,8 +461,14 @@ static int _ath10k_ce_send_nolock(struct ath10k_ce_pipe *ce_state,
 	write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
 
 	/* WORKAROUND */
-	if (!(flags & CE_SEND_FLAG_GATHER))
-		ath10k_ce_src_ring_write_index_set(ar, ctrl_addr, write_index);
+	if (!(flags & CE_SEND_FLAG_GATHER)) {
+		if (ar->hw_params.shadow_reg_support)
+			ath10k_ce_shadow_src_ring_write_index_set(ar, ce_state,
+								  write_index);
+		else
+			ath10k_ce_src_ring_write_index_set(ar, ctrl_addr,
+							   write_index);
+	}
 
 	src_ring->write_index = write_index;
 exit:
@@ -1251,6 +1342,22 @@ static int ath10k_ce_init_dest_ring(struct ath10k *ar,
 	return 0;
 }
 
+static int ath10k_ce_alloc_shadow_base(struct ath10k *ar,
+				       struct ath10k_ce_ring *src_ring,
+				       u32 nentries)
+{
+	src_ring->shadow_base_unaligned = kcalloc(nentries,
+						  sizeof(struct ce_desc),
+						  GFP_KERNEL);
+	if (!src_ring->shadow_base_unaligned)
+		return -ENOMEM;
+
+	src_ring->shadow_base = (struct ce_desc *)
+			PTR_ALIGN(src_ring->shadow_base_unaligned,
+				  CE_DESC_RING_ALIGN);
+	return 0;
+}
+
 static struct ath10k_ce_ring *
 ath10k_ce_alloc_src_ring(struct ath10k *ar, unsigned int ce_id,
 			 const struct ce_attr *attr)
@@ -1258,6 +1365,7 @@ ath10k_ce_alloc_src_ring(struct ath10k *ar, unsigned int ce_id,
 	struct ath10k_ce_ring *src_ring;
 	u32 nentries = attr->src_nentries;
 	dma_addr_t base_addr;
+	int ret;
 
 	nentries = roundup_pow_of_two(nentries);
 
@@ -1294,6 +1402,19 @@ ath10k_ce_alloc_src_ring(struct ath10k *ar, unsigned int ce_id,
 			ALIGN(src_ring->base_addr_ce_space_unaligned,
 			      CE_DESC_RING_ALIGN);
 
+	if (ar->hw_params.shadow_reg_support) {
+		ret = ath10k_ce_alloc_shadow_base(ar, src_ring, nentries);
+		if (ret) {
+			dma_free_coherent(ar->dev,
+					  (nentries * sizeof(struct ce_desc) +
+					   CE_DESC_RING_ALIGN),
+					  src_ring->base_addr_owner_space_unaligned,
+					  base_addr);
+			kfree(src_ring);
+			return ERR_PTR(ret);
+		}
+	}
+
 	return src_ring;
 }
 
@@ -1304,6 +1425,7 @@ ath10k_ce_alloc_src_ring_64(struct ath10k *ar, unsigned int ce_id,
 	struct ath10k_ce_ring *src_ring;
 	u32 nentries = attr->src_nentries;
 	dma_addr_t base_addr;
+	int ret;
 
 	nentries = roundup_pow_of_two(nentries);
 
@@ -1339,6 +1461,19 @@ ath10k_ce_alloc_src_ring_64(struct ath10k *ar, unsigned int ce_id,
 			ALIGN(src_ring->base_addr_ce_space_unaligned,
 			      CE_DESC_RING_ALIGN);
 
+	if (ar->hw_params.shadow_reg_support) {
+		ret = ath10k_ce_alloc_shadow_base(ar, src_ring, nentries);
+		if (ret) {
+			dma_free_coherent(ar->dev,
+					  (nentries * sizeof(struct ce_desc) +
+					   CE_DESC_RING_ALIGN),
+					  src_ring->base_addr_owner_space_unaligned,
+					  base_addr);
+			kfree(src_ring);
+			return ERR_PTR(ret);
+		}
+	}
+
 	return src_ring;
 }
 
@@ -1505,6 +1640,8 @@ static void _ath10k_ce_free_pipe(struct ath10k *ar, int ce_id)
 	struct ath10k_ce_pipe *ce_state = &ce->ce_states[ce_id];
 
 	if (ce_state->src_ring) {
+		if (ar->hw_params.shadow_reg_support)
+			kfree(ce_state->src_ring->shadow_base_unaligned);
 		dma_free_coherent(ar->dev,
 				  (ce_state->src_ring->nentries *
 				   sizeof(struct ce_desc) +
@@ -1534,6 +1671,8 @@ static void _ath10k_ce_free_pipe_64(struct ath10k *ar, int ce_id)
 	struct ath10k_ce_pipe *ce_state = &ce->ce_states[ce_id];
 
 	if (ce_state->src_ring) {
+		if (ar->hw_params.shadow_reg_support)
+			kfree(ce_state->src_ring->shadow_base_unaligned);
 		dma_free_coherent(ar->dev,
 				  (ce_state->src_ring->nentries *
 				   sizeof(struct ce_desc_64) +

drivers/net/wireless/ath/ath10k/ce.h

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2005-2011 Atheros Communications Inc.
  * Copyright (c) 2011-2017 Qualcomm Atheros, Inc.
+ * Copyright (c) 2018 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -113,6 +114,9 @@ struct ath10k_ce_ring {
 	/* CE address space */
 	u32 base_addr_ce_space;
 
+	char *shadow_base_unaligned;
+	struct ce_desc *shadow_base;
+
 	/* keep last */
 	void *per_transfer_context[0];
 };