can: sja1000: f81601: add Fintek F81601 support

This patch add support for Fintek PCIE to 2 CAN controller support
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/sja1000/Kconfig

@@ -21,6 +21,16 @@ config CAN_EMS_PCMCIA
 	  This driver is for the one or two channel CPC-CARD cards from
 	  EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
 
+config CAN_F81601
+	tristate "Fintek F81601 PCIE to 2 CAN Controller"
+	depends on PCI
+	help
+	  This driver adds support for Fintek F81601 PCIE to 2 CAN
+	  Controller. It had internal 24MHz clock source, but it can
+	  be changed by manufacturer. Use modinfo to get usage for
+	  parameters. Visit http://www.fintek.com.tw to get more
+	  information.
+
 config CAN_KVASER_PCI
 	tristate "Kvaser PCIcanx and Kvaser PCIcan PCI Cards"
 	depends on PCI

drivers/net/can/sja1000/Makefile

@@ -5,6 +5,7 @@
 
 obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
 obj-$(CONFIG_CAN_EMS_PCMCIA) += ems_pcmcia.o
+obj-$(CONFIG_CAN_F81601) += f81601.o
 obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
 obj-$(CONFIG_CAN_PEAK_PCI) += peak_pci.o
 obj-$(CONFIG_CAN_PEAK_PCMCIA) += peak_pcmcia.o

drivers/net/can/sja1000/f81601.c

+// SPDX-License-Identifier: GPL-2.0
+/* Fintek F81601 PCIE to 2 CAN controller driver
+ *
+ * Copyright (C) 2019 Peter Hong <peter_hong@fintek.com.tw>
+ * Copyright (C) 2019 Linux Foundation
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/can/dev.h>
+#include <linux/io.h>
+#include <linux/version.h>
+
+#include "sja1000.h"
+
+#define F81601_PCI_MAX_CHAN		2
+
+#define F81601_DECODE_REG		0x209
+#define F81601_IO_MODE			BIT(7)
+#define F81601_MEM_MODE			BIT(6)
+#define F81601_CFG_MODE			BIT(5)
+#define F81601_CAN2_INTERNAL_CLK	BIT(3)
+#define F81601_CAN1_INTERNAL_CLK	BIT(2)
+#define F81601_CAN2_EN			BIT(1)
+#define F81601_CAN1_EN			BIT(0)
+
+#define F81601_TRAP_REG			0x20a
+#define F81601_CAN2_HAS_EN		BIT(4)
+
+struct f81601_pci_card {
+	void __iomem *addr;
+	spinlock_t lock;	/* use this spin lock only for write access */
+	struct pci_dev *dev;
+	struct net_device *net_dev[F81601_PCI_MAX_CHAN];
+};
+
+static const struct pci_device_id f81601_pci_tbl[] = {
+	{ PCI_DEVICE(0x1c29, 0x1703) },
+	{ /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(pci, f81601_pci_tbl);
+
+static bool internal_clk = true;
+module_param(internal_clk, bool, 0444);
+MODULE_PARM_DESC(internal_clk, "Use internal clock, default true (24MHz)");
+
+static unsigned int external_clk;
+module_param(external_clk, uint, 0444);
+MODULE_PARM_DESC(external_clk, "External clock when internal_clk disabled");
+
+static u8 f81601_pci_read_reg(const struct sja1000_priv *priv, int port)
+{
+	return readb(priv->reg_base + port);
+}
+
+static void f81601_pci_write_reg(const struct sja1000_priv *priv, int port,
+				 u8 val)
+{
+	struct f81601_pci_card *card = priv->priv;
+	unsigned long flags;
+
+	spin_lock_irqsave(&card->lock, flags);
+	writeb(val, priv->reg_base + port);
+	readb(priv->reg_base);
+	spin_unlock_irqrestore(&card->lock, flags);
+}
+
+static void f81601_pci_remove(struct pci_dev *pdev)
+{
+	struct f81601_pci_card *card = pci_get_drvdata(pdev);
+	struct net_device *dev;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(card->net_dev); i++) {
+		dev = card->net_dev[i];
+		if (!dev)
+			continue;
+
+		dev_info(&pdev->dev, "%s: Removing %s\n", __func__, dev->name);
+
+		unregister_sja1000dev(dev);
+		free_sja1000dev(dev);
+	}
+}
+
+/* Probe F81601 based device for the SJA1000 chips and register each
+ * available CAN channel to SJA1000 Socket-CAN subsystem.
+ */
+static int f81601_pci_probe(struct pci_dev *pdev,
+			    const struct pci_device_id *ent)
+{
+	struct sja1000_priv *priv;
+	struct net_device *dev;
+	struct f81601_pci_card *card;
+	int err, i, count;
+	u8 tmp;
+
+	if (pcim_enable_device(pdev) < 0) {
+		dev_err(&pdev->dev, "Failed to enable PCI device\n");
+		return -ENODEV;
+	}
+
+	dev_info(&pdev->dev, "Detected card at slot #%i\n",
+		 PCI_SLOT(pdev->devfn));
+
+	card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
+	if (!card)
+		return -ENOMEM;
+
+	card->dev = pdev;
+	spin_lock_init(&card->lock);
+
+	pci_set_drvdata(pdev, card);
+
+	tmp = F81601_IO_MODE | F81601_MEM_MODE | F81601_CFG_MODE |
+		F81601_CAN2_EN | F81601_CAN1_EN;
+
+	if (internal_clk) {
+		tmp |= F81601_CAN2_INTERNAL_CLK | F81601_CAN1_INTERNAL_CLK;
+
+		dev_info(&pdev->dev,
+			 "F81601 running with internal clock: 24Mhz\n");
+	} else {
+		dev_info(&pdev->dev,
+			 "F81601 running with external clock: %dMhz\n",
+			 external_clk / 1000000);
+	}
+
+	pci_write_config_byte(pdev, F81601_DECODE_REG, tmp);
+
+	card->addr = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
+
+	if (!card->addr) {
+		err = -ENOMEM;
+		dev_err(&pdev->dev, "%s: Failed to remap BAR\n", __func__);
+		goto failure_cleanup;
+	}
+
+	/* read CAN2_HW_EN strap pin to detect how many CANBUS do we have */
+	count = ARRAY_SIZE(card->net_dev);
+	pci_read_config_byte(pdev, F81601_TRAP_REG, &tmp);
+	if (!(tmp & F81601_CAN2_HAS_EN))
+		count = 1;
+
+	for (i = 0; i < count; i++) {
+		dev = alloc_sja1000dev(0);
+		if (!dev) {
+			err = -ENOMEM;
+			goto failure_cleanup;
+		}
+
+		priv = netdev_priv(dev);
+		priv->priv = card;
+		priv->irq_flags = IRQF_SHARED;
+		priv->reg_base = card->addr + 0x80 * i;
+		priv->read_reg = f81601_pci_read_reg;
+		priv->write_reg = f81601_pci_write_reg;
+
+		if (internal_clk)
+			priv->can.clock.freq = 24000000 / 2;
+		else
+			priv->can.clock.freq = external_clk / 2;
+
+		priv->ocr = OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL;
+		priv->cdr = CDR_CBP;
+
+		SET_NETDEV_DEV(dev, &pdev->dev);
+		dev->dev_id = i;
+		dev->irq = pdev->irq;
+
+		/* Register SJA1000 device */
+		err = register_sja1000dev(dev);
+		if (err) {
+			dev_err(&pdev->dev,
+				"%s: Registering device failed: %x\n", __func__,
+				err);
+			free_sja1000dev(dev);
+			goto failure_cleanup;
+		}
+
+		card->net_dev[i] = dev;
+		dev_info(&pdev->dev, "Channel #%d, %s at 0x%p, irq %d\n", i,
+			 dev->name, priv->reg_base, dev->irq);
+	}
+
+	return 0;
+
+ failure_cleanup:
+	dev_err(&pdev->dev, "%s: failed: %d. Cleaning Up.\n", __func__, err);
+	f81601_pci_remove(pdev);
+
+	return err;
+}
+
+static struct pci_driver f81601_pci_driver = {
+	.name =	"f81601",
+	.id_table = f81601_pci_tbl,
+	.probe = f81601_pci_probe,
+	.remove = f81601_pci_remove,
+};
+
+MODULE_DESCRIPTION("Fintek F81601 PCIE to 2 CANBUS adaptor driver");
+MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
+MODULE_LICENSE("GPL v2");
+
+module_pci_driver(f81601_pci_driver);