The patch adds support for the PCI cards: PCIcan and PCIcanx (1, 2 or 4 channel) from Kvaser (http://www.kvaser.com).

Signed-off-by: Per Dalen <per.dalen@cnw.se>
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 419 insertions, 0 deletions

diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index f1684cd03b3a..cfd6c5a285fa 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -58,6 +58,13 @@ config CAN_EMS_PCI
           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_KVASER_PCI
+        tristate "Kvaser PCIcanx and Kvaser PCIcan PCI Cards"
+        depends on PCI && CAN_SJA1000
+        ---help---
+          This driver is for the the PCIcanx and PCIcan cards (1, 2 or
+          4 channel) from Kvaser (http://www.kvaser.com).
+
 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 7772dd23272d..d6c631f9e665 100644
--- a/drivers/net/can/sja1000/Makefile
+++ b/drivers/net/can/sja1000/Makefile
@@ -5,5 +5,6 @@
 obj-$(CONFIG_CAN_SJA1000) += sja1000.o
 obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
 obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
+obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
 
 ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
diff --git a/drivers/net/can/sja1000/kvaser_pci.c b/drivers/net/can/sja1000/kvaser_pci.c
new file mode 100644
index 000000000000..00830b358c4f
--- /dev/null
+++ b/drivers/net/can/sja1000/kvaser_pci.c
@@ -0,0 +1,411 @@
+/*
+ * Copyright (C) 2008 Per Dalen <per.dalen@cnw.se>
+ *
+ * Parts of this software are based on (derived) the following:
+ *
+ * - Kvaser linux driver, version 4.72 BETA
+ *   Copyright (C) 2002-2007 KVASER AB
+ *
+ * - Lincan driver, version 0.3.3, OCERA project
+ *   Copyright (C) 2004 Pavel Pisa
+ *   Copyright (C) 2001 Arnaud Westenberg
+ *
+ * - Socketcan SJA1000 drivers
+ *   Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
+ *   Copyright (c) 2002-2007 Volkswagen Group Electronic Research
+ *   Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
+ *   38106 Braunschweig, GERMANY
+ *
+ * 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  "kvaser_pci"
+
+MODULE_AUTHOR("Per Dalen <per.dalen@cnw.se>");
+MODULE_DESCRIPTION("Socket-CAN driver for KVASER PCAN PCI cards");
+MODULE_SUPPORTED_DEVICE("KVASER PCAN PCI CAN card");
+MODULE_LICENSE("GPL v2");
+
+#define MAX_NO_OF_CHANNELS        4 /* max no of channels on a single card */
+
+struct kvaser_pci {
+        int channel;
+        struct pci_dev *pci_dev;
+        struct net_device *slave_dev[MAX_NO_OF_CHANNELS-1];
+        void __iomem *conf_addr;
+        void __iomem *res_addr;
+        int no_channels;
+        u8 xilinx_ver;
+};
+
+#define KVASER_PCI_CAN_CLOCK      (16000000 / 2)
+
+/*
+ * 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 KVASER_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 0
+ * (meaning divide-by-2), the Pelican bit, and the clock-off bit
+ * (you will have no need for CLKOUT anyway).
+ */
+#define KVASER_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
+
+/*
+ * These register values are valid for revision 14 of the Xilinx logic.
+ */
+#define XILINX_VERINT             7   /* Lower nibble simulate interrupts,
+                                         high nibble version number. */
+
+#define XILINX_PRESUMED_VERSION   14
+
+/*
+ * Important S5920 registers
+ */
+#define S5920_INTCSR              0x38
+#define S5920_PTCR                0x60
+#define INTCSR_ADDON_INTENABLE_M  0x2000
+
+
+#define KVASER_PCI_PORT_BYTES     0x20
+
+#define PCI_CONFIG_PORT_SIZE      0x80      /* size of the config io-memory */
+#define PCI_PORT_SIZE             0x80      /* size of a channel io-memory */
+#define PCI_PORT_XILINX_SIZE      0x08      /* size of a xilinx io-memory */
+
+#define KVASER_PCI_VENDOR_ID1     0x10e8    /* the PCI device and vendor IDs */
+#define KVASER_PCI_DEVICE_ID1     0x8406
+
+#define KVASER_PCI_VENDOR_ID2     0x1a07    /* the PCI device and vendor IDs */
+#define KVASER_PCI_DEVICE_ID2     0x0008
+
+static struct pci_device_id kvaser_pci_tbl[] = {
+        {KVASER_PCI_VENDOR_ID1, KVASER_PCI_DEVICE_ID1, PCI_ANY_ID, PCI_ANY_ID,},
+        {KVASER_PCI_VENDOR_ID2, KVASER_PCI_DEVICE_ID2, PCI_ANY_ID, PCI_ANY_ID,},
+        { 0,}
+};
+
+MODULE_DEVICE_TABLE(pci, kvaser_pci_tbl);
+
+static u8 kvaser_pci_read_reg(const struct net_device *dev, int port)
+{
+        return ioread8((void __iomem *)(dev->base_addr + port));
+}
+
+static void kvaser_pci_write_reg(const struct net_device *dev, int port, u8 val)
+{
+        iowrite8(val, (void __iomem *)(dev->base_addr + port));
+}
+
+static void kvaser_pci_disable_irq(struct net_device *dev)
+{
+        struct sja1000_priv *priv = netdev_priv(dev);
+        struct kvaser_pci *board = priv->priv;
+        u32 intcsr;
+
+        /* Disable interrupts from card */
+        intcsr = ioread32(board->conf_addr + S5920_INTCSR);
+        intcsr &= ~INTCSR_ADDON_INTENABLE_M;
+        iowrite32(intcsr, board->conf_addr + S5920_INTCSR);
+}
+
+static void kvaser_pci_enable_irq(struct net_device *dev)
+{
+        struct sja1000_priv *priv = netdev_priv(dev);
+        struct kvaser_pci *board = priv->priv;
+        u32 tmp_en_io;
+
+        /* Enable interrupts from card */
+        tmp_en_io = ioread32(board->conf_addr + S5920_INTCSR);
+        tmp_en_io |= INTCSR_ADDON_INTENABLE_M;
+        iowrite32(tmp_en_io, board->conf_addr + S5920_INTCSR);
+}
+
+static int number_of_sja1000_chip(void __iomem *base_addr)
+{
+        u8 status;
+        int i;
+
+        for (i = 0; i < MAX_NO_OF_CHANNELS; i++) {
+                /* reset chip */
+                iowrite8(MOD_RM, base_addr +
+                         (i * KVASER_PCI_PORT_BYTES) + REG_MOD);
+                status = ioread8(base_addr +
+                                 (i * KVASER_PCI_PORT_BYTES) + REG_MOD);
+                /* check reset bit */
+                if (!(status & MOD_RM))
+                        break;
+        }
+
+        return i;
+}
+
+static void kvaser_pci_del_chan(struct net_device *dev)
+{
+        struct sja1000_priv *priv;
+        struct kvaser_pci *board;
+        int i;
+
+        if (!dev)
+                return;
+        priv = netdev_priv(dev);
+        board = priv->priv;
+        if (!board)
+                return;
+
+        dev_info(&board->pci_dev->dev, "Removing device %s\n",
+                 dev->name);
+
+        /* Disable PCI interrupts */
+        kvaser_pci_disable_irq(dev);
+
+        for (i = 0; i < board->no_channels - 1; i++) {
+                if (board->slave_dev[i]) {
+                        dev_info(&board->pci_dev->dev, "Removing device %s\n",
+                                 board->slave_dev[i]->name);
+                        unregister_sja1000dev(board->slave_dev[i]);
+                        free_sja1000dev(board->slave_dev[i]);
+                }
+        }
+        unregister_sja1000dev(dev);
+
+        pci_iounmap(board->pci_dev, (void __iomem *)dev->base_addr);
+        pci_iounmap(board->pci_dev, board->conf_addr);
+        pci_iounmap(board->pci_dev, board->res_addr);
+
+        free_sja1000dev(dev);
+}
+
+static int kvaser_pci_add_chan(struct pci_dev *pdev, int channel,
+                               struct net_device **master_dev,
+                               void __iomem *conf_addr,
+                               void __iomem *res_addr,
+                               unsigned long base_addr)
+{
+        struct net_device *dev;
+        struct sja1000_priv *priv;
+        struct kvaser_pci *board;
+        int err, init_step;
+
+        dev = alloc_sja1000dev(sizeof(struct kvaser_pci));
+        if (dev == NULL)
+                return -ENOMEM;
+
+        priv = netdev_priv(dev);
+        board = priv->priv;
+
+        board->pci_dev = pdev;
+        board->channel = channel;
+
+        /* S5920 */
+        board->conf_addr = conf_addr;
+
+        /* XILINX board wide address */
+        board->res_addr = res_addr;
+
+        if (channel == 0) {
+                board->xilinx_ver =
+                        ioread8(board->res_addr + XILINX_VERINT) >> 4;
+                init_step = 2;
+
+                /* Assert PTADR# - we're in passive mode so the other bits are
+                   not important */
+                iowrite32(0x80808080UL, board->conf_addr + S5920_PTCR);
+
+                /* Enable interrupts from card */
+                kvaser_pci_enable_irq(dev);
+        } else {
+                struct sja1000_priv *master_priv = netdev_priv(*master_dev);
+                struct kvaser_pci *master_board = master_priv->priv;
+                master_board->slave_dev[channel - 1] = dev;
+                master_board->no_channels = channel + 1;
+                board->xilinx_ver = master_board->xilinx_ver;
+        }
+
+        dev->base_addr = base_addr + channel * KVASER_PCI_PORT_BYTES;
+
+        priv->read_reg = kvaser_pci_read_reg;
+        priv->write_reg = kvaser_pci_write_reg;
+
+        priv->can.clock.freq = KVASER_PCI_CAN_CLOCK;
+
+        priv->ocr = KVASER_PCI_OCR;
+        priv->cdr = KVASER_PCI_CDR;
+
+        priv->irq_flags = IRQF_SHARED;
+        dev->irq = pdev->irq;
+
+        init_step = 4;
+
+        dev_info(&pdev->dev, "base_addr=%#lx conf_addr=%p irq=%d\n",
+                 dev->base_addr, board->conf_addr, dev->irq);
+
+        SET_NETDEV_DEV(dev, &pdev->dev);
+
+        /* Register SJA1000 device */
+        err = register_sja1000dev(dev);
+        if (err) {
+                dev_err(&pdev->dev, "Registering device failed (err=%d)\n",
+                        err);
+                goto failure;
+        }
+
+        if (channel == 0)
+                *master_dev = dev;
+
+        return 0;
+
+failure:
+        kvaser_pci_del_chan(dev);
+        return err;
+}
+
+static int __devinit kvaser_pci_init_one(struct pci_dev *pdev,
+                                         const struct pci_device_id *ent)
+{
+        int err;
+        struct net_device *master_dev = NULL;
+        struct sja1000_priv *priv;
+        struct kvaser_pci *board;
+        int no_channels;
+        void __iomem *base_addr = NULL;
+        void __iomem *conf_addr = NULL;
+        void __iomem *res_addr = NULL;
+        int i;
+
+        dev_info(&pdev->dev, "initializing device %04x:%04x\n",
+                 pdev->vendor, pdev->device);
+
+        err = pci_enable_device(pdev);
+        if (err)
+                goto failure;
+
+        err = pci_request_regions(pdev, DRV_NAME);
+        if (err)
+                goto failure_release_pci;
+
+        /* S5920 */
+        conf_addr = pci_iomap(pdev, 0, PCI_CONFIG_PORT_SIZE);
+        if (conf_addr == NULL) {
+                err = -ENODEV;
+                goto failure_release_regions;
+        }
+
+        /* XILINX board wide address */
+        res_addr = pci_iomap(pdev, 2, PCI_PORT_XILINX_SIZE);
+        if (res_addr == NULL) {
+                err = -ENOMEM;
+                goto failure_iounmap;
+        }
+
+        base_addr = pci_iomap(pdev, 1, PCI_PORT_SIZE);
+        if (base_addr == NULL) {
+                err = -ENOMEM;
+                goto failure_iounmap;
+        }
+
+        no_channels = number_of_sja1000_chip(base_addr);
+        if (no_channels == 0) {
+                err = -ENOMEM;
+                goto failure_iounmap;
+        }
+
+        for (i = 0; i < no_channels; i++) {
+                err = kvaser_pci_add_chan(pdev, i, &master_dev,
+                                          conf_addr, res_addr,
+                                          (unsigned long)base_addr);
+                if (err)
+                        goto failure_cleanup;
+        }
+
+        priv = netdev_priv(master_dev);
+        board = priv->priv;
+
+        dev_info(&pdev->dev, "xilinx version=%d number of channels=%d\n",
+                 board->xilinx_ver, board->no_channels);
+
+        pci_set_drvdata(pdev, master_dev);
+        return 0;
+
+failure_cleanup:
+        kvaser_pci_del_chan(master_dev);
+
+failure_iounmap:
+        if (conf_addr != NULL)
+                pci_iounmap(pdev, conf_addr);
+        if (res_addr != NULL)
+                pci_iounmap(pdev, res_addr);
+        if (base_addr != NULL)
+                pci_iounmap(pdev, base_addr);
+
+failure_release_regions:
+        pci_release_regions(pdev);
+
+failure_release_pci:
+        pci_disable_device(pdev);
+
+failure:
+        return err;
+
+}
+
+static void __devexit kvaser_pci_remove_one(struct pci_dev *pdev)
+{
+        struct net_device *dev = pci_get_drvdata(pdev);
+
+        kvaser_pci_del_chan(dev);
+
+        pci_release_regions(pdev);
+        pci_disable_device(pdev);
+        pci_set_drvdata(pdev, NULL);
+}
+
+static struct pci_driver kvaser_pci_driver = {
+        .name = DRV_NAME,
+        .id_table = kvaser_pci_tbl,
+        .probe = kvaser_pci_init_one,
+        .remove = __devexit_p(kvaser_pci_remove_one),
+};
+
+static int __init kvaser_pci_init(void)
+{
+        return pci_register_driver(&kvaser_pci_driver);
+}
+
+static void __exit kvaser_pci_exit(void)
+{
+        pci_unregister_driver(&kvaser_pci_driver);
+}
+
+module_init(kvaser_pci_init);
+module_exit(kvaser_pci_exit);