netdev - [PATCH net-next 21/47] can: ems_pci: Deassert hardware reset

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Message-Id: <20230206131620.2758724-22-mkl@pengutronix.de>
Date:   Mon,  6 Feb 2023 14:15:54 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de,
        Gerhard Uttenthaler <uttenthaler@...-wuensche.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 21/47] can: ems_pci: Deassert hardware reset

From: Gerhard Uttenthaler <uttenthaler@...-wuensche.com>

The reset line from the Asix chip to the SJA1000 is asserted after boot up
until it is deasserted by a register write

Signed-off-by: Gerhard Uttenthaler <uttenthaler@...-wuensche.com>
Link: https://lore.kernel.org/all/20230120112616.6071-8-uttenthaler@ems-wuensche.com
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/sja1000/ems_pci.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/can/sja1000/ems_pci.c b/drivers/net/can/sja1000/ems_pci.c
index 1f237acd7bd1..212d051c53c0 100644
--- a/drivers/net/can/sja1000/ems_pci.c
+++ b/drivers/net/can/sja1000/ems_pci.c
@@ -326,6 +326,14 @@ static int ems_pci_add_card(struct pci_dev *pdev,
 		}
 	}
 
+	if (card->version == 3) {
+		/* ASIX chip asserts local reset to CAN controllers
+		 * after bootup until it is deasserted
+		 */
+		writel(readl(card->conf_addr + ASIX_LIEMR) & ~ASIX_LIEMR_LRST,
+		       card->conf_addr + ASIX_LIEMR);
+	}
+
 	ems_pci_card_reset(card);
 
 	/* Detect available channels */
-- 
2.39.1