diff options
Diffstat (limited to 'drivers/net/can/sja1000/f81601.c')
| -rw-r--r-- | drivers/net/can/sja1000/f81601.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/net/can/sja1000/f81601.c b/drivers/net/can/sja1000/f81601.c new file mode 100644 index 000000000..8f25e9581 --- /dev/null +++ b/drivers/net/can/sja1000/f81601.c @@ -0,0 +1,211 @@ +// 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 "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); |