397 lines
9.9 KiB
C
397 lines
9.9 KiB
C
/*
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* Copyright (C) 2008 Per Dalen <per.dalen@cnw.se>
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*
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* Parts of this software are based on (derived) the following:
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*
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* - Kvaser linux driver, version 4.72 BETA
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* Copyright (C) 2002-2007 KVASER AB
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*
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* - Lincan driver, version 0.3.3, OCERA project
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* Copyright (C) 2004 Pavel Pisa
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* Copyright (C) 2001 Arnaud Westenberg
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*
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* - Socketcan SJA1000 drivers
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* Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
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* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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* Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
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* 38106 Braunschweig, GERMANY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the version 2 of the GNU General Public License
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/can/dev.h>
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#include <linux/io.h>
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#include "sja1000.h"
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#define DRV_NAME "kvaser_pci"
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MODULE_AUTHOR("Per Dalen <per.dalen@cnw.se>");
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MODULE_DESCRIPTION("Socket-CAN driver for KVASER PCAN PCI cards");
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MODULE_SUPPORTED_DEVICE("KVASER PCAN PCI CAN card");
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MODULE_LICENSE("GPL v2");
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#define MAX_NO_OF_CHANNELS 4 /* max no of channels on a single card */
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struct kvaser_pci {
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int channel;
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struct pci_dev *pci_dev;
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struct net_device *slave_dev[MAX_NO_OF_CHANNELS-1];
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void __iomem *conf_addr;
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void __iomem *res_addr;
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int no_channels;
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u8 xilinx_ver;
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};
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#define KVASER_PCI_CAN_CLOCK (16000000 / 2)
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/*
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* The board configuration is probably following:
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* RX1 is connected to ground.
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* TX1 is not connected.
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* CLKO is not connected.
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* Setting the OCR register to 0xDA is a good idea.
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* This means normal output mode , push-pull and the correct polarity.
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*/
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#define KVASER_PCI_OCR (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
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/*
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* In the CDR register, you should set CBP to 1.
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* You will probably also want to set the clock divider value to 0
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* (meaning divide-by-2), the Pelican bit, and the clock-off bit
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* (you will have no need for CLKOUT anyway).
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*/
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#define KVASER_PCI_CDR (CDR_CBP | CDR_CLKOUT_MASK)
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/*
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* These register values are valid for revision 14 of the Xilinx logic.
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*/
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#define XILINX_VERINT 7 /* Lower nibble simulate interrupts,
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high nibble version number. */
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#define XILINX_PRESUMED_VERSION 14
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/*
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* Important S5920 registers
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*/
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#define S5920_INTCSR 0x38
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#define S5920_PTCR 0x60
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#define INTCSR_ADDON_INTENABLE_M 0x2000
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#define KVASER_PCI_PORT_BYTES 0x20
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#define PCI_CONFIG_PORT_SIZE 0x80 /* size of the config io-memory */
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#define PCI_PORT_SIZE 0x80 /* size of a channel io-memory */
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#define PCI_PORT_XILINX_SIZE 0x08 /* size of a xilinx io-memory */
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#define KVASER_PCI_VENDOR_ID1 0x10e8 /* the PCI device and vendor IDs */
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#define KVASER_PCI_DEVICE_ID1 0x8406
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#define KVASER_PCI_VENDOR_ID2 0x1a07 /* the PCI device and vendor IDs */
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#define KVASER_PCI_DEVICE_ID2 0x0008
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static const struct pci_device_id kvaser_pci_tbl[] = {
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{KVASER_PCI_VENDOR_ID1, KVASER_PCI_DEVICE_ID1, PCI_ANY_ID, PCI_ANY_ID,},
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{KVASER_PCI_VENDOR_ID2, KVASER_PCI_DEVICE_ID2, PCI_ANY_ID, PCI_ANY_ID,},
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{ 0,}
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};
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MODULE_DEVICE_TABLE(pci, kvaser_pci_tbl);
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static u8 kvaser_pci_read_reg(const struct sja1000_priv *priv, int port)
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{
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return ioread8(priv->reg_base + port);
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}
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static void kvaser_pci_write_reg(const struct sja1000_priv *priv,
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int port, u8 val)
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{
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iowrite8(val, priv->reg_base + port);
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}
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static void kvaser_pci_disable_irq(struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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struct kvaser_pci *board = priv->priv;
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u32 intcsr;
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/* Disable interrupts from card */
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intcsr = ioread32(board->conf_addr + S5920_INTCSR);
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intcsr &= ~INTCSR_ADDON_INTENABLE_M;
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iowrite32(intcsr, board->conf_addr + S5920_INTCSR);
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}
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static void kvaser_pci_enable_irq(struct net_device *dev)
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{
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struct sja1000_priv *priv = netdev_priv(dev);
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struct kvaser_pci *board = priv->priv;
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u32 tmp_en_io;
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/* Enable interrupts from card */
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tmp_en_io = ioread32(board->conf_addr + S5920_INTCSR);
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tmp_en_io |= INTCSR_ADDON_INTENABLE_M;
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iowrite32(tmp_en_io, board->conf_addr + S5920_INTCSR);
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}
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static int number_of_sja1000_chip(void __iomem *base_addr)
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{
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u8 status;
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int i;
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for (i = 0; i < MAX_NO_OF_CHANNELS; i++) {
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/* reset chip */
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iowrite8(MOD_RM, base_addr +
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(i * KVASER_PCI_PORT_BYTES) + SJA1000_MOD);
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status = ioread8(base_addr +
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(i * KVASER_PCI_PORT_BYTES) + SJA1000_MOD);
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/* check reset bit */
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if (!(status & MOD_RM))
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break;
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}
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return i;
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}
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static void kvaser_pci_del_chan(struct net_device *dev)
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{
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struct sja1000_priv *priv;
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struct kvaser_pci *board;
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int i;
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if (!dev)
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return;
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priv = netdev_priv(dev);
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board = priv->priv;
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if (!board)
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return;
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dev_info(&board->pci_dev->dev, "Removing device %s\n",
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dev->name);
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/* Disable PCI interrupts */
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kvaser_pci_disable_irq(dev);
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for (i = 0; i < board->no_channels - 1; i++) {
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if (board->slave_dev[i]) {
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dev_info(&board->pci_dev->dev, "Removing device %s\n",
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board->slave_dev[i]->name);
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unregister_sja1000dev(board->slave_dev[i]);
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free_sja1000dev(board->slave_dev[i]);
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}
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}
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unregister_sja1000dev(dev);
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pci_iounmap(board->pci_dev, priv->reg_base);
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pci_iounmap(board->pci_dev, board->conf_addr);
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pci_iounmap(board->pci_dev, board->res_addr);
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free_sja1000dev(dev);
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}
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static int kvaser_pci_add_chan(struct pci_dev *pdev, int channel,
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struct net_device **master_dev,
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void __iomem *conf_addr,
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void __iomem *res_addr,
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void __iomem *base_addr)
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{
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struct net_device *dev;
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struct sja1000_priv *priv;
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struct kvaser_pci *board;
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int err;
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dev = alloc_sja1000dev(sizeof(struct kvaser_pci));
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if (dev == NULL)
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return -ENOMEM;
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priv = netdev_priv(dev);
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board = priv->priv;
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board->pci_dev = pdev;
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board->channel = channel;
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/* S5920 */
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board->conf_addr = conf_addr;
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/* XILINX board wide address */
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board->res_addr = res_addr;
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if (channel == 0) {
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board->xilinx_ver =
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ioread8(board->res_addr + XILINX_VERINT) >> 4;
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/* Assert PTADR# - we're in passive mode so the other bits are
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not important */
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iowrite32(0x80808080UL, board->conf_addr + S5920_PTCR);
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/* Enable interrupts from card */
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kvaser_pci_enable_irq(dev);
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} else {
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struct sja1000_priv *master_priv = netdev_priv(*master_dev);
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struct kvaser_pci *master_board = master_priv->priv;
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master_board->slave_dev[channel - 1] = dev;
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master_board->no_channels = channel + 1;
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board->xilinx_ver = master_board->xilinx_ver;
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}
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priv->reg_base = base_addr + channel * KVASER_PCI_PORT_BYTES;
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priv->read_reg = kvaser_pci_read_reg;
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priv->write_reg = kvaser_pci_write_reg;
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priv->can.clock.freq = KVASER_PCI_CAN_CLOCK;
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priv->ocr = KVASER_PCI_OCR;
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priv->cdr = KVASER_PCI_CDR;
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priv->irq_flags = IRQF_SHARED;
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dev->irq = pdev->irq;
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dev_info(&pdev->dev, "reg_base=%p conf_addr=%p irq=%d\n",
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priv->reg_base, board->conf_addr, dev->irq);
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SET_NETDEV_DEV(dev, &pdev->dev);
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dev->dev_id = channel;
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/* Register SJA1000 device */
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err = register_sja1000dev(dev);
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if (err) {
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dev_err(&pdev->dev, "Registering device failed (err=%d)\n",
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err);
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goto failure;
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}
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if (channel == 0)
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*master_dev = dev;
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return 0;
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failure:
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kvaser_pci_del_chan(dev);
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return err;
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}
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static int kvaser_pci_init_one(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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int err;
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struct net_device *master_dev = NULL;
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struct sja1000_priv *priv;
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struct kvaser_pci *board;
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int no_channels;
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void __iomem *base_addr = NULL;
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void __iomem *conf_addr = NULL;
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void __iomem *res_addr = NULL;
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int i;
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dev_info(&pdev->dev, "initializing device %04x:%04x\n",
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pdev->vendor, pdev->device);
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err = pci_enable_device(pdev);
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if (err)
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goto failure;
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err = pci_request_regions(pdev, DRV_NAME);
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if (err)
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goto failure_release_pci;
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/* S5920 */
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conf_addr = pci_iomap(pdev, 0, PCI_CONFIG_PORT_SIZE);
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if (conf_addr == NULL) {
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err = -ENODEV;
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goto failure_release_regions;
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}
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/* XILINX board wide address */
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res_addr = pci_iomap(pdev, 2, PCI_PORT_XILINX_SIZE);
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if (res_addr == NULL) {
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err = -ENOMEM;
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goto failure_iounmap;
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}
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base_addr = pci_iomap(pdev, 1, PCI_PORT_SIZE);
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if (base_addr == NULL) {
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err = -ENOMEM;
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goto failure_iounmap;
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}
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no_channels = number_of_sja1000_chip(base_addr);
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if (no_channels == 0) {
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err = -ENOMEM;
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goto failure_iounmap;
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}
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for (i = 0; i < no_channels; i++) {
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err = kvaser_pci_add_chan(pdev, i, &master_dev,
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conf_addr, res_addr,
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base_addr);
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if (err)
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goto failure_cleanup;
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}
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priv = netdev_priv(master_dev);
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board = priv->priv;
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dev_info(&pdev->dev, "xilinx version=%d number of channels=%d\n",
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board->xilinx_ver, board->no_channels);
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pci_set_drvdata(pdev, master_dev);
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return 0;
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failure_cleanup:
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kvaser_pci_del_chan(master_dev);
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failure_iounmap:
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if (conf_addr != NULL)
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pci_iounmap(pdev, conf_addr);
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if (res_addr != NULL)
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pci_iounmap(pdev, res_addr);
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if (base_addr != NULL)
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pci_iounmap(pdev, base_addr);
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failure_release_regions:
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pci_release_regions(pdev);
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failure_release_pci:
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pci_disable_device(pdev);
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failure:
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return err;
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}
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static void kvaser_pci_remove_one(struct pci_dev *pdev)
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{
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struct net_device *dev = pci_get_drvdata(pdev);
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kvaser_pci_del_chan(dev);
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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}
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static struct pci_driver kvaser_pci_driver = {
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.name = DRV_NAME,
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.id_table = kvaser_pci_tbl,
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.probe = kvaser_pci_init_one,
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.remove = kvaser_pci_remove_one,
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};
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module_pci_driver(kvaser_pci_driver);
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