linux-kernel - [PATCH v1 2/2] memory: renesas-rpc-if: Add Octal DTR mode support

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Date:   Thu, 24 Nov 2022 15:39:57 +0800
From:   JaimeLiao <jaimeliao.tw@...il.com>
To:     broonie@...nel.org, krzysztof.kozlowski@...aro.org,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     jaimeliao@...c.com.tw, JaimeLiao <jaimeliao.tw@...il.com>
Subject: [PATCH v1 2/2] memory: renesas-rpc-if: Add Octal DTR mode support

1. Support Octal DTR manual mode (Program & Erase & register)
2. Support diramap read (enable external address space read mode)

Signed-off-by: JaimeLiao <jaimeliao.tw@...il.com>
---
 drivers/memory/renesas-rpc-if.c | 56 +++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
index bdf0a7f68ff2..db5019a7190e 100644
--- a/drivers/memory/renesas-rpc-if.c
+++ b/drivers/memory/renesas-rpc-if.c
@@ -462,6 +462,43 @@ void rpcif_prepare(struct rpcif *rpc, const struct rpcif_op *op, u64 *offs,
 
 		rpc->enable |= RPCIF_SMENR_SPIDB(rpcif_bit_size(op->data.buswidth));
 	}
+       /* Fixup in Octal DTR mode */
+	if (op->cmd.buswidth == 8 && op->cmd.ddr) {
+		rpc->bus_size = 2;
+
+		regmap_update_bits(rpc->regmap, RPCIF_PHYCNT,
+				   RPCIF_PHYCNT_OCTA(0x2) | RPCIF_PHYCNT_OCT |
+				   RPCIF_PHYCNT_PHYMEM(0x1) ,
+				   RPCIF_PHYCNT_OCTA(0x2) | RPCIF_PHYCNT_OCT |
+				   RPCIF_PHYCNT_PHYMEM(0x1));
+		regmap_update_bits(rpc->regmap, RPCIF_CMNCR, RPCIF_CMNCR_BSZ(1),
+				   RPCIF_CMNCR_BSZ(1));
+
+		regmap_update_bits(rpc->regmap, RPCIF_PHYOFFSET1,
+				   RPCIF_PHYOFFSET1_DDRTMG(3),
+				   RPCIF_PHYOFFSET1_DDRTMG(2));
+		regmap_update_bits(rpc->regmap, RPCIF_PHYOFFSET2,
+				   RPCIF_PHYOFFSET2_OCTTMG(7),
+				   RPCIF_PHYOFFSET2_OCTTMG(3));
+
+		if (op->ocmd.buswidth == 8 && RPCIF_SMENR_OCDE)
+			rpc->enable &= ~RPCIF_SMENR_OCDE;
+
+		if (op->addr.ddr)
+			rpc->enable &= ~RPCIF_SMENR_ADE(0xF) |
+					RPCIF_SMENR_ADE(0xc);
+
+		if (op->dummy.buswidth == 8)
+			rpc->dummy =
+				RPCIF_SMDMCR_DMCYC(op->dummy.ncycles / 2);
+
+		if (op->data.dir == RPCIF_DATA_IN)
+			/* Set Extenal Address space Read mode */
+			if (op->data.buswidth == 8 && op->data.ddr) {
+				regmap_update_bits(rpc->regmap, RPCIF_PHYCNT,
+					RPCIF_PHYCNT_EXDS, RPCIF_PHYCNT_EXDS);
+			}
+	}
 }
 EXPORT_SYMBOL(rpcif_prepare);
 
@@ -501,10 +538,24 @@ int rpcif_manual_xfer(struct rpcif *rpc)
 			rpc->xfer_size = nbytes;
 
 			memcpy(data, rpc->buffer + pos, nbytes);
+			if (rpc->bus_size == 2) {
+				data[0] = (data[0] & 0x00f000f0) << 8 |
+					  (data[0] & 0xf000f000) >> 4 |
+					  (data[0] & 0x000f000f) << 4 |
+					  (data[0] & 0x0f000f00) >> 8;
+
+				data[1] = (data[1] & 0x00f000f0) << 8 |
+					  (data[1] & 0xf000f000) >> 4 |
+					  (data[1] & 0x000f000f) << 4 |
+					  (data[1] & 0x0f000f00) >> 8;
+			}
 			if (nbytes == 8)
 				regmap_write(rpc->regmap, RPCIF_SMWDR1, *p++);
 			regmap_write(rpc->regmap, RPCIF_SMWDR0, *p);
 
+			regmap_write(rpc->regmap, RPCIF_SMADR,
+				     rpc->smadr + pos);
+			regmap_write(rpc->regmap, RPCIF_SMENR, smenr);
 			regmap_write(rpc->regmap, RPCIF_SMCR, smcr);
 			ret = wait_msg_xfer_end(rpc);
 			if (ret)
@@ -652,9 +703,14 @@ ssize_t rpcif_dirmap_read(struct rpcif *rpc, u64 offs, size_t len, void *buf)
 	regmap_write(rpc->regmap, RPCIF_DROPR, rpc->option);
 	regmap_write(rpc->regmap, RPCIF_DRENR,
 		     rpc->enable & ~RPCIF_SMENR_SPIDE(0xF));
+	regmap_write(rpc->regmap, RPCIF_SMENR,
+		     rpc->enable & ~RPCIF_SMENR_SPIDE(0xF));
 	regmap_write(rpc->regmap, RPCIF_DRDMCR, rpc->dummy);
 	regmap_write(rpc->regmap, RPCIF_DRDRENR, rpc->ddr);
 
+	regmap_update_bits(rpc->regmap, RPCIF_DRENR, RPCIF_DRENR_ADE(0xF),
+			   RPCIF_DRENR_ADE(0xF));
+
 	if (rpc->bus_size == 2)
 		memcpy_fromio_readw(buf, rpc->dirmap + from, len);
 	else
-- 
2.17.1