linux-kernel - [PATCH 10/33] fsi: aspeed: Add AST2700 support

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Message-Id: <20240215220759.976998-11-eajames@linux.ibm.com>
Date: Thu, 15 Feb 2024 16:07:36 -0600
From: Eddie James <eajames@...ux.ibm.com>
To: linux-fsi@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        andi.shyti@...nel.org, eajames@...ux.ibm.com, alistair@...ple.id.au,
        joel@....id.au, jk@...abs.org, sboyd@...nel.org,
        mturquette@...libre.com, robh@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Subject: [PATCH 10/33] fsi: aspeed: Add AST2700 support

AST2700 requires a few bits set differently in the OPB retry
counter register, so add some match data and set the register
accordingly.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index f0a19cd451a0..d6e923b8f501 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -18,6 +18,10 @@
 
 #include "fsi-master.h"
 
+struct fsi_master_aspeed_data {
+	u32 opb_retry_counter;
+};
+
 struct fsi_master_aspeed {
 	struct fsi_master	master;
 	struct mutex		lock;	/* protect HW access */
@@ -60,6 +64,8 @@ static const u32 fsi_base = 0xa0000000;
 #define OPB1_READ_ORDER2	0x60
 
 #define OPB_RETRY_COUNTER	0x64
+#define OPB_RETRY_COUNTER_AST2600	0x00000010
+#define OPB_RETRY_COUNTER_AST2700	0x000c0010
 
 /* OPBn_STATUS */
 #define STATUS_HALFWORD_ACK	BIT(0)
@@ -536,6 +542,8 @@ static int tacoma_cabled_fsi_fixup(struct device *dev)
 
 static int fsi_master_aspeed_probe(struct platform_device *pdev)
 {
+	const struct fsi_master_aspeed_data *md = of_device_get_match_data(&pdev->dev);
+	u32 opb_retry_counter = md ? md->opb_retry_counter : OPB_RETRY_COUNTER_AST2600;
 	struct fsi_master_aspeed *aspeed;
 	int rc, links, reg;
 	__be32 raw;
@@ -579,8 +587,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	writel(OPB1_XFER_ACK_EN | OPB0_XFER_ACK_EN,
 			aspeed->base + OPB_IRQ_MASK);
 
-	/* TODO: determine an appropriate value */
-	writel(0x10, aspeed->base + OPB_RETRY_COUNTER);
+	writel(opb_retry_counter, aspeed->base + OPB_RETRY_COUNTER);
 
 	writel(ctrl_base, aspeed->base + OPB_CTRL_BASE);
 	writel(fsi_base, aspeed->base + OPB_FSI_BASE);
@@ -656,8 +663,23 @@ static int fsi_master_aspeed_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct fsi_master_aspeed_data fsi_master_ast2600_data = {
+	.opb_retry_counter = OPB_RETRY_COUNTER_AST2600,
+};
+
+static const struct fsi_master_aspeed_data fsi_master_ast2700_data = {
+	.opb_retry_counter = OPB_RETRY_COUNTER_AST2700,
+};
+
 static const struct of_device_id fsi_master_aspeed_match[] = {
-	{ .compatible = "aspeed,ast2600-fsi-master" },
+	{
+		.compatible = "aspeed,ast2600-fsi-master",
+		.data = &fsi_master_ast2600_data,
+	},
+	{
+		.compatible = "aspeed,ast2700-fsi-master",
+		.data = &fsi_master_ast2700_data,
+	},
 	{ },
 };
 MODULE_DEVICE_TABLE(of, fsi_master_aspeed_match);
-- 
2.39.3