[PATCH v2 7/7] [PATCH 7/8] can: SJA1000 driver for Kvaser PCI cards

Wolfgang Grandegger
2009-05-12T09:30:56Z

[-- Attachment #1: 07-sja1000-kvaser-pci-driver.patch --]
[-- Type: text/plain, Size: 13056 bytes --]

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>
---
drivers/net/can/Kconfig | 7
drivers/net/can/sja1000/Makefile | 1
drivers/net/can/sja1000/kvaser_pci.c | 415 +++++++++++++++++++++++++++++++++++
3 files changed, 423 insertions(+)
create mode 100644 drivers/net/can/sja1000/kvaser_pci.c

Index: net-next-2.6/drivers/net/can/Kconfig
===================================================================
--- net-next-2.6.orig/drivers/net/can/Kconfig 2009-05-12 10:47:27.116970063 +0200
+++ net-next-2.6/drivers/net/can/Kconfig 2009-05-12 10:47:27.844971068 +0200
@@ -58,6 +58,13 @@
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
Index: net-next-2.6/drivers/net/can/sja1000/Makefile
===================================================================
--- net-next-2.6.orig/drivers/net/can/sja1000/Makefile 2009-05-12 10:47:27.116970063 +0200
+++ net-next-2.6/drivers/net/can/sja1000/Makefile 2009-05-12 10:47:27.845970931 +0200
@@ -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
Index: net-next-2.6/drivers/net/can/sja1000/kvaser_pci.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ net-next-2.6/drivers/net/can/sja1000/kvaser_pci.c 2009-05-12 10:47:27.849970943 +0200
@@ -0,0 +1,415 @@
+/*
+ * 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 tmp;
+
+ /* Disable interrupts from card */
+ tmp = ioread32(board->conf_addr + S5920_INTCSR);
+ tmp &= ~INTCSR_ADDON_INTENABLE_M;
+ iowrite32(tmp, 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;
+
+ /* Enable interrupts from card */
+ tmp = ioread32(board->conf_addr + S5920_INTCSR);
+ tmp |= INTCSR_ADDON_INTENABLE_M;
+ iowrite32(tmp, 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);
+ udelay(10);
+ /* 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);
+ if (!priv)
+ return;
+ board = priv->priv;
+ if (!board)
+ return;
+
+ dev_info(&board->pci_dev->dev, "Removing device %s\n",
+ dev->name);
+
+ 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);
+
+ /* Disable PCI interrupts */
+ kvaser_pci_disable_irq(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);
+
+ /* Disable interrupts from card */
+ kvaser_pci_disable_irq(dev);
+ /* 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;
+
+ /* Register and setup interrupt handling */
+ 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_iounmap;
+ }
+
+ /*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);
+
+ 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);