[PATCH net-next] can/sja1000: add driver for EMS PCMCIA card
Markus Plessing
plessing at ems-wuensche.com
Mon Sep 26 04:15:00 EDT 2011
Am 23.09.2011 18:59, schrieb Oliver Hartkopp:
> This patch adds the driver for the SJA1000 based PCMCIA card 'CPC-Card' from
> EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
>
> Signed-off-by: Oliver Hartkopp<socketcan-fJ+pQTUTwRTk1uMJSBkQmQ at public.gmane.org>
Acked-by: Markus Plessing <plessing at ems-wuensche.com>
Thanks Oliver.
> ---
>
> diff -u -r -N a/drivers/net/can/sja1000/Kconfig b/drivers/net/can/sja1000/Kconfig
> --- a/drivers/net/can/sja1000/Kconfig 2011-09-23 18:02:35.711750820 +0200
> +++ b/drivers/net/can/sja1000/Kconfig 2011-09-23 18:02:28.695751113 +0200
> @@ -29,6 +29,13 @@
> OpenFirmware bindings, e.g. if you have a PowerPC based system
> you may want to enable this option.
>
> +config CAN_EMS_PCMCIA
> + tristate "EMS CPC-CARD Card"
> + depends on PCMCIA
> + ---help---
> + This driver is for the one or two channel CPC-CARD cards from
> + EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
> +
> config CAN_EMS_PCI
> tristate "EMS CPC-PCI, CPC-PCIe and CPC-104P Card"
> depends on PCI
> diff -u -r -N a/drivers/net/can/sja1000/Makefile b/drivers/net/can/sja1000/Makefile
> --- a/drivers/net/can/sja1000/Makefile 2011-09-23 18:02:38.595750534 +0200
> +++ b/drivers/net/can/sja1000/Makefile 2011-09-23 18:02:28.695751113 +0200
> @@ -6,6 +6,7 @@
> obj-$(CONFIG_CAN_SJA1000_ISA) += sja1000_isa.o
> obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
> obj-$(CONFIG_CAN_SJA1000_OF_PLATFORM) += sja1000_of_platform.o
> +obj-$(CONFIG_CAN_EMS_PCMCIA) += ems_pcmcia.o
> obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
> obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
> obj-$(CONFIG_CAN_PEAK_PCI) += peak_pci.o
> diff -u -r -N a/drivers/net/can/sja1000/ems_pcmcia.c b/drivers/net/can/sja1000/ems_pcmcia.c
> --- a/drivers/net/can/sja1000/ems_pcmcia.c 1970-01-01 01:00:00.000000000 +0100
> +++ b/drivers/net/can/sja1000/ems_pcmcia.c 2011-09-23 18:13:59.227726972 +0200
> @@ -0,0 +1,331 @@
> +/*
> + * Copyright (C) 2008 Sebastian Haas (initial chardev implementation)
> + * Copyright (C) 2010 Markus Plessing<plessing-zsNKPWJ8Pib6hrUXjxyGrA at public.gmane.org>
> + * Rework for mainline by Oliver Hartkopp<socketcan-fJ+pQTUTwRTk1uMJSBkQmQ at public.gmane.org>
> + *
> + * 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.
> + */
> +
> +#include<linux/kernel.h>
> +#include<linux/module.h>
> +#include<linux/interrupt.h>
> +#include<linux/netdevice.h>
> +#include<linux/delay.h>
> +#include<linux/io.h>
> +#include<pcmcia/cistpl.h>
> +#include<pcmcia/ds.h>
> +#include<linux/can.h>
> +#include<linux/can/dev.h>
> +#include "sja1000.h"
> +
> +#define DRV_NAME "ems_pcmcia"
> +
> +MODULE_AUTHOR("Markus Plessing<plessing-zsNKPWJ8Pib6hrUXjxyGrA at public.gmane.org>");
> +MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-CARD cards");
> +MODULE_SUPPORTED_DEVICE("EMS CPC-CARD CAN card");
> +MODULE_LICENSE("GPL v2");
> +
> +#define EMS_PCMCIA_MAX_CHAN 2
> +
> +struct ems_pcmcia_card {
> + int channels;
> + struct pcmcia_device *pcmcia_dev;
> + struct net_device *net_dev[EMS_PCMCIA_MAX_CHAN];
> + void __iomem *base_addr;
> +};
> +
> +#define EMS_PCMCIA_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 EMS_PCMCIA_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_PCMCIA_CDR (CDR_CBP | CDR_CLKOUT_MASK)
> +#define EMS_PCMCIA_MEM_SIZE 4096 /* Size of the remapped io-memory */
> +#define EMS_PCMCIA_CAN_BASE_OFFSET 0x100 /* Offset where controllers starts */
> +#define EMS_PCMCIA_CAN_CTRL_SIZE 0x80 /* Memory size for each controller */
> +
> +#define EMS_CMD_RESET 0x00 /* Perform a reset of the card */
> +#define EMS_CMD_MAP 0x03 /* Map CAN controllers into card' memory */
> +#define EMS_CMD_UMAP 0x02 /* Unmap CAN controllers from card' memory */
> +
> +static struct pcmcia_device_id ems_pcmcia_tbl[] = {
> + PCMCIA_DEVICE_PROD_ID123("EMS_T_W", "CPC-Card", "V2.0", 0xeab1ea23,
> + 0xa338573f, 0xe4575800),
> + PCMCIA_DEVICE_NULL,
> +};
> +
> +MODULE_DEVICE_TABLE(pcmcia, ems_pcmcia_tbl);
> +
> +static u8 ems_pcmcia_read_reg(const struct sja1000_priv *priv, int port)
> +{
> + return readb(priv->reg_base + port);
> +}
> +
> +static void ems_pcmcia_write_reg(const struct sja1000_priv *priv, int port,
> + u8 val)
> +{
> + writeb(val, priv->reg_base + port);
> +}
> +
> +static irqreturn_t ems_pcmcia_interrupt(int irq, void *dev_id)
> +{
> + struct ems_pcmcia_card *card = dev_id;
> + struct net_device *dev;
> + irqreturn_t retval = IRQ_NONE;
> + int i, again;
> +
> + /* Card not present */
> + if (readw(card->base_addr) != 0xAA55)
> + return IRQ_HANDLED;
> +
> + do {
> + again = 0;
> +
> + /* Check interrupt for each channel */
> + for (i = 0; i< card->channels; i++) {
> + dev = card->net_dev[i];
> + if (!dev)
> + continue;
> +
> + if (sja1000_interrupt(irq, dev) == IRQ_HANDLED)
> + again = 1;
> + }
> + /* At least one channel handled the interrupt */
> + if (again)
> + retval = IRQ_HANDLED;
> +
> + } while (again);
> +
> + return retval;
> +}
> +
> +/*
> + * Check if a CAN controller is present at the specified location
> + * by trying to set 'em into the PeliCAN mode
> + */
> +static inline int ems_pcmcia_check_chan(struct sja1000_priv *priv)
> +{
> + /* Make sure SJA1000 is in reset mode */
> + ems_pcmcia_write_reg(priv, REG_MOD, 1);
> + ems_pcmcia_write_reg(priv, REG_CDR, CDR_PELICAN);
> +
> + /* read reset-values */
> + if (ems_pcmcia_read_reg(priv, REG_CDR) == CDR_PELICAN)
> + return 1;
> +
> + return 0;
> +}
> +
> +static void ems_pcmcia_del_card(struct pcmcia_device *pdev)
> +{
> + struct ems_pcmcia_card *card = pdev->priv;
> + struct net_device *dev;
> + int i;
> +
> + free_irq(pdev->irq, card);
> +
> + for (i = 0; i< card->channels; i++) {
> + dev = card->net_dev[i];
> + if (!dev)
> + continue;
> +
> + printk(KERN_INFO "%s: removing %s on channel #%d\n",
> + DRV_NAME, dev->name, i);
> + unregister_sja1000dev(dev);
> + free_sja1000dev(dev);
> + }
> +
> + writeb(EMS_CMD_UMAP, card->base_addr);
> + iounmap(card->base_addr);
> + kfree(card);
> +
> + pdev->priv = NULL;
> +}
> +
> +/*
> + * Probe PCI device for EMS CAN signature and register each available
> + * CAN channel to SJA1000 Socket-CAN subsystem.
> + */
> +static int __devinit ems_pcmcia_add_card(struct pcmcia_device *pdev,
> + unsigned long base)
> +{
> + struct sja1000_priv *priv;
> + struct net_device *dev;
> + struct ems_pcmcia_card *card;
> + int err, i;
> +
> + /* Allocating card structures to hold addresses, ... */
> + card = kzalloc(sizeof(struct ems_pcmcia_card), GFP_KERNEL);
> + if (!card)
> + return -ENOMEM;
> +
> + pdev->priv = card;
> + card->channels = 0;
> +
> + card->base_addr = ioremap(base, EMS_PCMCIA_MEM_SIZE);
> + if (!card->base_addr) {
> + err = -ENOMEM;
> + goto failure_cleanup;
> + }
> +
> + /* Check for unique EMS CAN signature */
> + if (readw(card->base_addr) != 0xAA55) {
> + err = -ENODEV;
> + goto failure_cleanup;
> + }
> +
> + /* Request board reset */
> + writeb(EMS_CMD_RESET, card->base_addr);
> +
> + /* Make sure CAN controllers are mapped into card's memory space */
> + writeb(EMS_CMD_MAP, card->base_addr);
> +
> + /* Detect available channels */
> + for (i = 0; i< EMS_PCMCIA_MAX_CHAN; i++) {
> + dev = alloc_sja1000dev(0);
> + if (!dev) {
> + err = -ENOMEM;
> + goto failure_cleanup;
> + }
> +
> + card->net_dev[i] = dev;
> + priv = netdev_priv(dev);
> + priv->priv = card;
> + SET_NETDEV_DEV(dev,&pdev->dev);
> +
> + priv->irq_flags = IRQF_SHARED;
> + dev->irq = pdev->irq;
> + priv->reg_base = card->base_addr + EMS_PCMCIA_CAN_BASE_OFFSET +
> + (i * EMS_PCMCIA_CAN_CTRL_SIZE);
> +
> + /* Check if channel is present */
> + if (ems_pcmcia_check_chan(priv)) {
> + priv->read_reg = ems_pcmcia_read_reg;
> + priv->write_reg = ems_pcmcia_write_reg;
> + priv->can.clock.freq = EMS_PCMCIA_CAN_CLOCK;
> + priv->ocr = EMS_PCMCIA_OCR;
> + priv->cdr = EMS_PCMCIA_CDR;
> + priv->flags |= SJA1000_CUSTOM_IRQ_HANDLER;
> +
> + /* Register SJA1000 device */
> + err = register_sja1000dev(dev);
> + if (err) {
> + free_sja1000dev(dev);
> + goto failure_cleanup;
> + }
> +
> + card->channels++;
> +
> + printk(KERN_INFO "%s: registered %s on channel "
> + "#%d at 0x%p, irq %d\n", DRV_NAME, dev->name,
> + i, priv->reg_base, dev->irq);
> + } else
> + free_sja1000dev(dev);
> + }
> +
> + err = request_irq(dev->irq,&ems_pcmcia_interrupt, IRQF_SHARED,
> + DRV_NAME, card);
> + if (!err)
> + return 0;
> +
> +failure_cleanup:
> + ems_pcmcia_del_card(pdev);
> + return err;
> +}
> +
> +/*
> + * Setup PCMCIA socket and probe for EMS CPC-CARD
> + */
> +static int __devinit ems_pcmcia_probe(struct pcmcia_device *dev)
> +{
> + int csval;
> +
> + /* General socket configuration */
> + dev->config_flags |= CONF_ENABLE_IRQ;
> + dev->config_index = 1;
> + dev->config_regs = PRESENT_OPTION;
> +
> + /* The io structure describes IO port mapping */
> + dev->resource[0]->end = 16;
> + dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
> + dev->resource[1]->end = 16;
> + dev->resource[1]->flags |= IO_DATA_PATH_WIDTH_16;
> + dev->io_lines = 5;
> +
> + /* Allocate a memory window */
> + dev->resource[2]->flags =
> + (WIN_DATA_WIDTH_8 | WIN_MEMORY_TYPE_CM | WIN_ENABLE);
> + dev->resource[2]->start = dev->resource[2]->end = 0;
> +
> + csval = pcmcia_request_window(dev, dev->resource[2], 0);
> + if (csval) {
> + dev_err(&dev->dev, "pcmcia_request_window failed (err=%d)\n",
> + csval);
> + return 0;
> + }
> +
> + csval = pcmcia_map_mem_page(dev, dev->resource[2], dev->config_base);
> + if (csval) {
> + dev_err(&dev->dev, "pcmcia_map_mem_page failed (err=%d)\n",
> + csval);
> + return 0;
> + }
> +
> + csval = pcmcia_enable_device(dev);
> + if (csval) {
> + dev_err(&dev->dev, "pcmcia_enable_device failed (err=%d)\n",
> + csval);
> + return 0;
> + }
> +
> + ems_pcmcia_add_card(dev, dev->resource[2]->start);
> + return 0;
> +}
> +
> +/*
> + * Release claimed resources
> + */
> +static void ems_pcmcia_remove(struct pcmcia_device *dev)
> +{
> + ems_pcmcia_del_card(dev);
> + pcmcia_disable_device(dev);
> +}
> +
> +static struct pcmcia_driver ems_pcmcia_driver = {
> + .name = DRV_NAME,
> + .probe = ems_pcmcia_probe,
> + .remove = ems_pcmcia_remove,
> + .id_table = ems_pcmcia_tbl,
> +};
> +
> +static int __init ems_pcmcia_init(void)
> +{
> + return pcmcia_register_driver(&ems_pcmcia_driver);
> +}
> +module_init(ems_pcmcia_init);
> +
> +static void __exit ems_pcmcia_exit(void)
> +{
> + pcmcia_unregister_driver(&ems_pcmcia_driver);
> +}
> +module_exit(ems_pcmcia_exit);
--
EMS Dr. Thomas Wuensche e.K.
Sonnenhang 3
85304 Ilmmuenster
HRA Neuburg a.d. Donau, HR-Nr. 70.106
Phone: +49-8441-490260
Fax : +49-8441-81860
http://www.ems-wuensche.com
More information about the linux-pcmcia
mailing list