linux-kernel - [PATCH 4/4] can: bxcan: add support for single peripheral configuration

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Message-Id: <20230423172528.1398158-5-dario.binacchi@amarulasolutions.com>
Date:   Sun, 23 Apr 2023 19:25:28 +0200
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     Amarula patchwork <linux-amarula@...rulasolutions.com>,
        michael@...rulasolutions.com,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Paolo Abeni <pabeni@...hat.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 4/4] can: bxcan: add support for single peripheral configuration

Add support for bxCAN controller in single peripheral configuration:
- primary bxCAN
- dedicated Memory Access Controller unit
- 512-byte SRAM memory
- 14 fiter banks

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

---

 drivers/net/can/bxcan.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/bxcan.c b/drivers/net/can/bxcan.c
index e26ccd41e3cb..9bcbbb85da6e 100644
--- a/drivers/net/can/bxcan.c
+++ b/drivers/net/can/bxcan.c
@@ -155,6 +155,7 @@ struct bxcan_regs {
 	u32 reserved0[88];		/* 0x20 */
 	struct bxcan_mb tx_mb[BXCAN_TX_MB_NUM];	/* 0x180 - tx mailbox */
 	struct bxcan_mb rx_mb[BXCAN_RX_MB_NUM];	/* 0x1b0 - rx mailbox */
+	u32 reserved1[12];		/* 0x1d0 */
 };
 
 struct bxcan_priv {
@@ -922,6 +923,12 @@ static int bxcan_get_berr_counter(const struct net_device *ndev,
 	return 0;
 }
 
+static const struct regmap_config bxcan_gcan_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
 static int bxcan_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -942,11 +949,18 @@ static int bxcan_probe(struct platform_device *pdev)
 
 	gcan = syscon_regmap_lookup_by_phandle(np, "st,gcan");
 	if (IS_ERR(gcan)) {
-		dev_err(dev, "failed to get shared memory base address\n");
-		return PTR_ERR(gcan);
+		primary = true;
+		gcan = devm_regmap_init_mmio(dev,
+					     regs + sizeof(struct bxcan_regs),
+					     &bxcan_gcan_regmap_config);
+		if (IS_ERR(gcan)) {
+			dev_err(dev, "failed to get filter base address\n");
+			return PTR_ERR(gcan);
+		}
+	} else {
+		primary = of_property_read_bool(np, "st,can-primary");
 	}
 
-	primary = of_property_read_bool(np, "st,can-primary");
 	clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(clk)) {
 		dev_err(dev, "failed to get clock\n");
-- 
2.32.0