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3e66d0138c
My objective is to be able to totally discriminate CAN ports on multi-port
cards via udev so as to rename them to semantically interesting/unique names
for my system (e.g., "ecuCAN" and "auxCAN" instead of "can0" and "can1").
The following patch assigns the dev_id field to match the channel number on all
multi-channel devices. I can only test my two-port Peak PCI card, but it works
as expected: ATTRS{dev_id} now expresses the port number and my udev rules now
unambiguously pick out and rename my individual CAN ports.
Signed-off-by: Christopher R. Baker <cbaker@rec.ri.cmu.edu>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net> [PEAK PCAN-USB pro and EMS PCMCIA]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
321 lines
8.1 KiB
C
321 lines
8.1 KiB
C
/*
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* Copyright (C) 2008 Sebastian Haas (initial chardev implementation)
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* Copyright (C) 2010 Markus Plessing <plessing@ems-wuensche.com>
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* Rework for mainline by Oliver Hartkopp <socketcan@hartkopp.net>
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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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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/io.h>
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#include <pcmcia/cistpl.h>
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#include <pcmcia/ds.h>
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include "sja1000.h"
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#define DRV_NAME "ems_pcmcia"
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MODULE_AUTHOR("Markus Plessing <plessing@ems-wuensche.com>");
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MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-CARD cards");
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MODULE_SUPPORTED_DEVICE("EMS CPC-CARD CAN card");
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MODULE_LICENSE("GPL v2");
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#define EMS_PCMCIA_MAX_CHAN 2
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struct ems_pcmcia_card {
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int channels;
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struct pcmcia_device *pcmcia_dev;
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struct net_device *net_dev[EMS_PCMCIA_MAX_CHAN];
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void __iomem *base_addr;
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};
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#define EMS_PCMCIA_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 EMS_PCMCIA_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 7
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* (meaning direct oscillator output) because the second SJA1000 chip
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* is driven by the first one CLKOUT output.
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*/
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#define EMS_PCMCIA_CDR (CDR_CBP | CDR_CLKOUT_MASK)
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#define EMS_PCMCIA_MEM_SIZE 4096 /* Size of the remapped io-memory */
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#define EMS_PCMCIA_CAN_BASE_OFFSET 0x100 /* Offset where controllers starts */
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#define EMS_PCMCIA_CAN_CTRL_SIZE 0x80 /* Memory size for each controller */
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#define EMS_CMD_RESET 0x00 /* Perform a reset of the card */
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#define EMS_CMD_MAP 0x03 /* Map CAN controllers into card' memory */
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#define EMS_CMD_UMAP 0x02 /* Unmap CAN controllers from card' memory */
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static struct pcmcia_device_id ems_pcmcia_tbl[] = {
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PCMCIA_DEVICE_PROD_ID123("EMS_T_W", "CPC-Card", "V2.0", 0xeab1ea23,
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0xa338573f, 0xe4575800),
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PCMCIA_DEVICE_NULL,
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};
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MODULE_DEVICE_TABLE(pcmcia, ems_pcmcia_tbl);
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static u8 ems_pcmcia_read_reg(const struct sja1000_priv *priv, int port)
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{
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return readb(priv->reg_base + port);
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}
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static void ems_pcmcia_write_reg(const struct sja1000_priv *priv, int port,
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u8 val)
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{
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writeb(val, priv->reg_base + port);
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}
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static irqreturn_t ems_pcmcia_interrupt(int irq, void *dev_id)
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{
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struct ems_pcmcia_card *card = dev_id;
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struct net_device *dev;
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irqreturn_t retval = IRQ_NONE;
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int i, again;
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/* Card not present */
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if (readw(card->base_addr) != 0xAA55)
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return IRQ_HANDLED;
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do {
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again = 0;
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/* Check interrupt for each channel */
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for (i = 0; i < card->channels; i++) {
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dev = card->net_dev[i];
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if (!dev)
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continue;
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if (sja1000_interrupt(irq, dev) == IRQ_HANDLED)
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again = 1;
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}
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/* At least one channel handled the interrupt */
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if (again)
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retval = IRQ_HANDLED;
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} while (again);
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return retval;
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}
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/*
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* Check if a CAN controller is present at the specified location
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* by trying to set 'em into the PeliCAN mode
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*/
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static inline int ems_pcmcia_check_chan(struct sja1000_priv *priv)
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{
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/* Make sure SJA1000 is in reset mode */
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ems_pcmcia_write_reg(priv, SJA1000_MOD, 1);
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ems_pcmcia_write_reg(priv, SJA1000_CDR, CDR_PELICAN);
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/* read reset-values */
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if (ems_pcmcia_read_reg(priv, SJA1000_CDR) == CDR_PELICAN)
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return 1;
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return 0;
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}
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static void ems_pcmcia_del_card(struct pcmcia_device *pdev)
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{
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struct ems_pcmcia_card *card = pdev->priv;
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struct net_device *dev;
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int i;
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free_irq(pdev->irq, card);
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for (i = 0; i < card->channels; i++) {
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dev = card->net_dev[i];
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if (!dev)
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continue;
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printk(KERN_INFO "%s: removing %s on channel #%d\n",
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DRV_NAME, dev->name, i);
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unregister_sja1000dev(dev);
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free_sja1000dev(dev);
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}
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writeb(EMS_CMD_UMAP, card->base_addr);
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iounmap(card->base_addr);
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kfree(card);
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pdev->priv = NULL;
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}
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/*
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* Probe PCI device for EMS CAN signature and register each available
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* CAN channel to SJA1000 Socket-CAN subsystem.
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*/
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static int ems_pcmcia_add_card(struct pcmcia_device *pdev, unsigned long base)
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{
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struct sja1000_priv *priv;
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struct net_device *dev;
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struct ems_pcmcia_card *card;
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int err, i;
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/* Allocating card structures to hold addresses, ... */
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card = kzalloc(sizeof(struct ems_pcmcia_card), GFP_KERNEL);
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if (!card)
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return -ENOMEM;
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pdev->priv = card;
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card->channels = 0;
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card->base_addr = ioremap(base, EMS_PCMCIA_MEM_SIZE);
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if (!card->base_addr) {
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err = -ENOMEM;
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goto failure_cleanup;
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}
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/* Check for unique EMS CAN signature */
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if (readw(card->base_addr) != 0xAA55) {
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err = -ENODEV;
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goto failure_cleanup;
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}
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/* Request board reset */
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writeb(EMS_CMD_RESET, card->base_addr);
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/* Make sure CAN controllers are mapped into card's memory space */
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writeb(EMS_CMD_MAP, card->base_addr);
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/* Detect available channels */
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for (i = 0; i < EMS_PCMCIA_MAX_CHAN; i++) {
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dev = alloc_sja1000dev(0);
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if (!dev) {
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err = -ENOMEM;
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goto failure_cleanup;
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}
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card->net_dev[i] = dev;
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priv = netdev_priv(dev);
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priv->priv = card;
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SET_NETDEV_DEV(dev, &pdev->dev);
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dev->dev_id = i;
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priv->irq_flags = IRQF_SHARED;
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dev->irq = pdev->irq;
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priv->reg_base = card->base_addr + EMS_PCMCIA_CAN_BASE_OFFSET +
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(i * EMS_PCMCIA_CAN_CTRL_SIZE);
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/* Check if channel is present */
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if (ems_pcmcia_check_chan(priv)) {
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priv->read_reg = ems_pcmcia_read_reg;
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priv->write_reg = ems_pcmcia_write_reg;
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priv->can.clock.freq = EMS_PCMCIA_CAN_CLOCK;
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priv->ocr = EMS_PCMCIA_OCR;
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priv->cdr = EMS_PCMCIA_CDR;
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priv->flags |= SJA1000_CUSTOM_IRQ_HANDLER;
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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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free_sja1000dev(dev);
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goto failure_cleanup;
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}
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card->channels++;
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printk(KERN_INFO "%s: registered %s on channel "
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"#%d at 0x%p, irq %d\n", DRV_NAME, dev->name,
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i, priv->reg_base, dev->irq);
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} else
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free_sja1000dev(dev);
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}
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err = request_irq(dev->irq, &ems_pcmcia_interrupt, IRQF_SHARED,
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DRV_NAME, card);
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if (!err)
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return 0;
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failure_cleanup:
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ems_pcmcia_del_card(pdev);
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return err;
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}
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/*
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* Setup PCMCIA socket and probe for EMS CPC-CARD
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*/
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static int ems_pcmcia_probe(struct pcmcia_device *dev)
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{
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int csval;
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/* General socket configuration */
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dev->config_flags |= CONF_ENABLE_IRQ;
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dev->config_index = 1;
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dev->config_regs = PRESENT_OPTION;
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/* The io structure describes IO port mapping */
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dev->resource[0]->end = 16;
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dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
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dev->resource[1]->end = 16;
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dev->resource[1]->flags |= IO_DATA_PATH_WIDTH_16;
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dev->io_lines = 5;
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/* Allocate a memory window */
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dev->resource[2]->flags =
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(WIN_DATA_WIDTH_8 | WIN_MEMORY_TYPE_CM | WIN_ENABLE);
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dev->resource[2]->start = dev->resource[2]->end = 0;
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csval = pcmcia_request_window(dev, dev->resource[2], 0);
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if (csval) {
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dev_err(&dev->dev, "pcmcia_request_window failed (err=%d)\n",
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csval);
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return 0;
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}
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csval = pcmcia_map_mem_page(dev, dev->resource[2], dev->config_base);
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if (csval) {
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dev_err(&dev->dev, "pcmcia_map_mem_page failed (err=%d)\n",
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csval);
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return 0;
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}
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csval = pcmcia_enable_device(dev);
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if (csval) {
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dev_err(&dev->dev, "pcmcia_enable_device failed (err=%d)\n",
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csval);
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return 0;
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}
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ems_pcmcia_add_card(dev, dev->resource[2]->start);
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return 0;
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}
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/*
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* Release claimed resources
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*/
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static void ems_pcmcia_remove(struct pcmcia_device *dev)
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{
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ems_pcmcia_del_card(dev);
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pcmcia_disable_device(dev);
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}
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static struct pcmcia_driver ems_pcmcia_driver = {
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.name = DRV_NAME,
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.probe = ems_pcmcia_probe,
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.remove = ems_pcmcia_remove,
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.id_table = ems_pcmcia_tbl,
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};
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module_pcmcia_driver(ems_pcmcia_driver);
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