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    Subject[PATCH 6/8] can: SJA1000 driver for EMS PCI cards
    Date
    The patch adds support for the one or two channel CPC-PCI and CPC-PCIe
    cards from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).

    Signed-off-by: Sebastian Haas <haas@ems-wuensche.com>
    Signed-off-by: Markus Plessing <plessing@ems-wuensche.com>
    Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
    ---
    drivers/net/can/Kconfig | 7 +
    drivers/net/can/sja1000/Makefile | 1 +
    drivers/net/can/sja1000/ems_pci.c | 328 +++++++++++++++++++++++++++++++++++++
    3 files changed, 336 insertions(+), 0 deletions(-)
    create mode 100644 drivers/net/can/sja1000/ems_pci.c

    diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
    index d6dee40..4e6887e 100644
    --- a/drivers/net/can/Kconfig
    +++ b/drivers/net/can/Kconfig
    @@ -56,6 +56,13 @@ config CAN_SJA1000_PLATFORM
    boards from Phytec (http://www.phytec.de) like the PCM027,
    PCM038.

    +config CAN_EMS_PCI
    + tristate "EMS CPC-PCI and CPC-PCIe Card"
    + depends on PCI && CAN_SJA1000
    + ---help---
    + This driver is for the one or two channel CPC-PCI and CPC-PCIe
    + cards from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
    +
    config CAN_DEBUG_DEVICES
    bool "CAN devices debugging messages"
    depends on CAN
    diff --git a/drivers/net/can/sja1000/Makefile b/drivers/net/can/sja1000/Makefile
    index 5115cc9..7772dd2 100644
    --- a/drivers/net/can/sja1000/Makefile
    +++ b/drivers/net/can/sja1000/Makefile
    @@ -4,5 +4,6 @@

    obj-$(CONFIG_CAN_SJA1000) += sja1000.o
    obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
    +obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o

    ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
    diff --git a/drivers/net/can/sja1000/ems_pci.c b/drivers/net/can/sja1000/ems_pci.c
    new file mode 100644
    index 0000000..6076375
    --- /dev/null
    +++ b/drivers/net/can/sja1000/ems_pci.c
    @@ -0,0 +1,328 @@
    +/*
    + * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
    + * Copyright (C) 2008 Markus Plessing <plessing@ems-wuensche.com>
    + * Copyright (C) 2008 Sebastian Haas <haas@ems-wuensche.com>
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the version 2 of the GNU General Public License
    + * as published by the Free Software Foundation
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software Foundation,
    + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
    + */
    +
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/interrupt.h>
    +#include <linux/netdevice.h>
    +#include <linux/delay.h>
    +#include <linux/pci.h>
    +#include <linux/can.h>
    +#include <linux/can/dev.h>
    +#include <linux/io.h>
    +
    +#include "sja1000.h"
    +
    +#define DRV_NAME "ems_pci"
    +
    +MODULE_AUTHOR("Sebastian Haas <haas@ems-wuenche.com>");
    +MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-PCI/PCIe CAN cards");
    +MODULE_SUPPORTED_DEVICE("EMS CPC-PCI/PCIe CAN card");
    +MODULE_LICENSE("GPL v2");
    +
    +#define EMS_PCI_MAX_CHAN 2
    +
    +struct ems_pci_card {
    + int channels;
    +
    + struct pci_dev *pci_dev;
    + struct net_device *net_dev[EMS_PCI_MAX_CHAN];
    +
    + void __iomem *conf_addr;
    + void __iomem *base_addr;
    +};
    +
    +#define EMS_PCI_CAN_CLOCK (16000000 / 2)
    +
    +/*
    + * Register definitions and descriptions are from LinCAN 0.3.3.
    + *
    + * PSB4610 PITA-2 bridge control registers
    + */
    +#define PITA2_ICR 0x00 /* Interrupt Control Register */
    +#define PITA2_ICR_INT0 0x00000002 /* [RC] INT0 Active/Clear */
    +#define PITA2_ICR_INT0_EN 0x00020000 /* [RW] Enable INT0 */
    +
    +#define PITA2_MISC 0x1c /* Miscellaneous Register */
    +#define PITA2_MISC_CONFIG 0x04000000 /* Multiplexed parallel interface */
    +
    +/*
    + * The board configuration is probably following:
    + * RX1 is connected to ground.
    + * TX1 is not connected.
    + * CLKO is not connected.
    + * Setting the OCR register to 0xDA is a good idea.
    + * This means normal output mode , push-pull and the correct polarity.
    + */
    +#define EMS_PCI_OCR (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
    +
    +/*
    + * In the CDR register, you should set CBP to 1.
    + * You will probably also want to set the clock divider value to 7
    + * (meaning direct oscillator output) because the second SJA1000 chip
    + * is driven by the first one CLKOUT output.
    + */
    +#define EMS_PCI_CDR (CDR_CBP | CDR_CLKOUT_MASK)
    +#define EMS_PCI_MEM_SIZE 4096 /* Size of the remapped io-memory */
    +#define EMS_PCI_CAN_BASE_OFFSET 0x400 /* offset where the controllers starts */
    +#define EMS_PCI_CAN_CTRL_SIZE 0x200 /* memory size for each controller */
    +
    +#define EMS_PCI_PORT_BYTES 0x4 /* Each register occupies 4 bytes */
    +
    +#define EMS_PCI_VENDOR_ID 0x110a /* PCI device and vendor ID */
    +#define EMS_PCI_DEVICE_ID 0x2104
    +
    +static struct pci_device_id ems_pci_tbl[] = {
    + {EMS_PCI_VENDOR_ID, EMS_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
    + {0,}
    +};
    +MODULE_DEVICE_TABLE(pci, ems_pci_tbl);
    +
    +/*
    + * Helper to read internal registers from card logic (not CAN)
    + */
    +static u8 ems_pci_readb(struct ems_pci_card *card, unsigned int port)
    +{
    + return readb((void __iomem *)card->base_addr
    + + (port * EMS_PCI_PORT_BYTES));
    +}
    +
    +static u8 ems_pci_read_reg(struct net_device *dev, int port)
    +{
    + return readb((void __iomem *)dev->base_addr
    + + (port * EMS_PCI_PORT_BYTES));
    +}
    +
    +static void ems_pci_write_reg(struct net_device *dev, int port, u8 val)
    +{
    + writeb(val, (void __iomem *)dev->base_addr
    + + (port * EMS_PCI_PORT_BYTES));
    +}
    +
    +static void ems_pci_post_irq(struct net_device *dev)
    +{
    + struct sja1000_priv *priv = netdev_priv(dev);
    + struct ems_pci_card *card = (struct ems_pci_card *)priv->priv;
    +
    + /* reset int flag of pita */
    + writel(PITA2_ICR_INT0_EN | PITA2_ICR_INT0, card->conf_addr
    + + PITA2_ICR);
    +}
    +
    +/*
    + * Check if a CAN controller is present at the specified location
    + * by trying to set 'em into the PeliCAN mode
    + */
    +static inline int ems_pci_check_chan(struct net_device *dev)
    +{
    + unsigned char res;
    +
    + /* Make sure SJA1000 is in reset mode */
    + ems_pci_write_reg(dev, REG_MOD, 1);
    +
    + ems_pci_write_reg(dev, REG_CDR, CDR_PELICAN);
    +
    + /* read reset-values */
    + res = ems_pci_read_reg(dev, REG_CDR);
    +
    + if (res == CDR_PELICAN)
    + return 1;
    +
    + return 0;
    +}
    +
    +static void ems_pci_del_card(struct pci_dev *pdev)
    +{
    + struct ems_pci_card *card = pci_get_drvdata(pdev);
    + struct net_device *dev;
    + int i = 0;
    +
    + for (i = 0; i < card->channels; i++) {
    + dev = card->net_dev[i];
    +
    + if (!dev)
    + continue;
    +
    + dev_info(&pdev->dev, "Removing %s.\n", dev->name);
    + unregister_sja1000dev(dev);
    + free_sja1000dev(dev);
    + }
    +
    + if (card->base_addr != NULL)
    + pci_iounmap(card->pci_dev, card->base_addr);
    +
    + if (card->conf_addr != NULL)
    + pci_iounmap(card->pci_dev, card->conf_addr);
    +
    + kfree(card);
    +
    + pci_disable_device(pdev);
    + pci_set_drvdata(pdev, NULL);
    +}
    +
    +static void ems_pci_card_reset(struct ems_pci_card *card)
    +{
    + /* Request board reset */
    + writeb(0, card->base_addr);
    +}
    +
    +/*
    + * Probe PCI device for EMS CAN signature and register each available
    + * CAN channel to SJA1000 Socket-CAN subsystem.
    + */
    +static int __devinit ems_pci_add_card(struct pci_dev *pdev,
    + const struct pci_device_id *ent)
    +{
    + struct sja1000_priv *priv;
    + struct net_device *dev;
    + struct ems_pci_card *card;
    + int err, i;
    +
    + /* Enabling PCI device */
    + if (pci_enable_device(pdev) < 0) {
    + dev_err(&pdev->dev, "Enabling PCI device failed\n");
    + return -ENODEV;
    + }
    +
    + /* Allocating card structures to hold addresses, ... */
    + card = kzalloc(sizeof(struct ems_pci_card), GFP_KERNEL);
    + if (card == NULL) {
    + dev_err(&pdev->dev, "Unable to allocate memory\n");
    + pci_disable_device(pdev);
    + return -ENOMEM;
    + }
    +
    + pci_set_drvdata(pdev, card);
    +
    + card->pci_dev = pdev;
    +
    + card->channels = 0;
    +
    + /* Remap PITA configuration space, and controller memory area */
    + card->conf_addr = pci_iomap(pdev, 0, EMS_PCI_MEM_SIZE);
    + if (card->conf_addr == NULL) {
    + err = -ENOMEM;
    +
    + goto failure_cleanup;
    + }
    +
    + card->base_addr = pci_iomap(pdev, 1, EMS_PCI_MEM_SIZE);
    + if (card->base_addr == NULL) {
    + err = -ENOMEM;
    +
    + goto failure_cleanup;
    + }
    +
    + /* Configure PITA-2 parallel interface (enable MUX) */
    + writel(PITA2_MISC_CONFIG, card->conf_addr + PITA2_MISC);
    +
    + /* Check for unique EMS CAN signature */
    + if (ems_pci_readb(card, 0) != 0x55 ||
    + ems_pci_readb(card, 1) != 0xAA ||
    + ems_pci_readb(card, 2) != 0x01 ||
    + ems_pci_readb(card, 3) != 0xCB ||
    + ems_pci_readb(card, 4) != 0x11) {
    + dev_err(&pdev->dev, "Not EMS Dr. Thomas Wuensche interface\n");
    +
    + err = -ENODEV;
    + goto failure_cleanup;
    + }
    +
    + ems_pci_card_reset(card);
    +
    + /* Detect available channels */
    + for (i = 0; i < EMS_PCI_MAX_CHAN; i++) {
    + dev = alloc_sja1000dev(0);
    + if (dev == NULL) {
    + err = -ENOMEM;
    + goto failure_cleanup;
    + }
    +
    + card->net_dev[i] = dev;
    + priv = netdev_priv(dev);
    + priv->priv = card;
    +
    + dev->irq = pdev->irq;
    + dev->base_addr = (unsigned long)(card->base_addr
    + + EMS_PCI_CAN_BASE_OFFSET
    + + (i * EMS_PCI_CAN_CTRL_SIZE));
    +
    + /* Check if channel is present */
    + if (ems_pci_check_chan(dev)) {
    + priv->read_reg = ems_pci_read_reg;
    + priv->write_reg = ems_pci_write_reg;
    + priv->post_irq = ems_pci_post_irq;
    + priv->can.bittiming.clock = EMS_PCI_CAN_CLOCK;
    + priv->ocr = EMS_PCI_OCR;
    + priv->cdr = EMS_PCI_CDR;
    +
    + SET_NETDEV_DEV(dev, &pdev->dev);
    +
    + /* Enable interrupts from card */
    + writel(PITA2_ICR_INT0_EN, card->conf_addr + PITA2_ICR);
    +
    + /* Register SJA1000 device */
    + err = register_sja1000dev(dev);
    + if (err) {
    + dev_err(&pdev->dev, "Registering device failed "
    + "(err=%d)\n", err);
    + free_sja1000dev(dev);
    + goto failure_cleanup;
    + }
    +
    + card->channels++;
    +
    + dev_info(&pdev->dev, "Channel #%d at %#lX, irq %d\n",
    + i + 1, dev->base_addr,
    + dev->irq);
    + } else {
    + free_sja1000dev(dev);
    + }
    + }
    +
    + return 0;
    +
    +failure_cleanup:
    + dev_err(&pdev->dev, "Error: %d. Cleaning Up.\n", err);
    +
    + ems_pci_del_card(pdev);
    +
    + return err;
    +}
    +
    +static struct pci_driver ems_pci_driver = {
    + .name = DRV_NAME,
    + .id_table = ems_pci_tbl,
    + .probe = ems_pci_add_card,
    + .remove = ems_pci_del_card,
    +};
    +
    +static int __init ems_pci_init(void)
    +{
    + return pci_register_driver(&ems_pci_driver);
    +}
    +
    +static void __exit ems_pci_exit(void)
    +{
    + pci_unregister_driver(&ems_pci_driver);
    +}
    +
    +module_init(ems_pci_init);
    +module_exit(ems_pci_exit);
    +
    --
    1.5.6.6


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