--- /dev/null
+/*
+ * Copyright (C) 2008 Sebastian Haas <haas@ems-wuensche.com>
+ *
+ * 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/can.h>
+#include <linux/can/dev.h>
+#include <asm/io.h>
+
+#include <pcmcia/version.h>
+#include <pcmcia/cs_types.h>
+#include <pcmcia/cs.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ciscode.h>
+#include <pcmcia/ds.h>
+#include <pcmcia/cisreg.h>
+
+#include "sja1000.h"
+
+#define DRV_NAME "ems_pcmcia"
+
+MODULE_AUTHOR("Sebastian Haas <haas@ems-wuenche.com>");
+MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-CARD cards");
+MODULE_SUPPORTED_DEVICE("EMS CPC-CARD CAN card");
+MODULE_LICENSE("GPL v2");
+
+static int debug;
+
+module_param(debug, int, S_IRUGO | S_IWUSR);
+
+MODULE_PARM_DESC(debug, "Set debug level (default: 0)");
+
+#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 void ems_pcmcia_config(struct pcmcia_device *dev);
+
+static u8 ems_pcmcia_read_reg(struct net_device *dev, int port)
+{
+ return readb((void __iomem *)dev->base_addr + port);
+}
+
+static void ems_pcmcia_write_reg(struct net_device *dev, int port, u8 val)
+{
+ writeb(val, (void __iomem *)dev->base_addr + port);
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+static irqreturn_t ems_pcmcia_interrupt(int irq, void *dev_id,
+ struct pt_regs *regs)
+#else
+static irqreturn_t ems_pcmcia_interrupt(int irq, void *dev_id)
+#endif
+{
+ struct ems_pcmcia_card *card = dev_id;
+ struct net_device *dev;
+ irqreturn_t retval = IRQ_NONE;
+ int i, again;
+
+ do {
+ again = 0;
+
+ /* Check interrupt for each channel */
+ for (i = 0; i < EMS_PCMCIA_MAX_CHAN; i++) {
+ dev = card->net_dev[i];
+ if (!dev)
+ continue;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+ if (sja1000_interrupt(irq, dev, regs) == IRQ_HANDLED)
+ again = 1;
+#else
+ if (sja1000_interrupt(irq, dev) == IRQ_HANDLED)
+ again = 1;
+#endif
+ }
+ /* 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 net_device *dev)
+{
+ unsigned char res;
+
+ /* Make sure SJA1000 is in reset mode */
+ ems_pcmcia_write_reg(dev, REG_MOD, 1);
+
+ ems_pcmcia_write_reg(dev, REG_CDR, CDR_PELICAN);
+
+ /* read reset-values */
+ res = ems_pcmcia_read_reg(dev, REG_CDR);
+
+ if (res == 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 = 0;
+
+ if (!card)
+ return;
+
+ free_irq(pdev->irq.AssignedIRQ, card);
+
+ for (i = 0; i < card->channels; i++) {
+ dev = card->net_dev[i];
+
+ if (!dev)
+ continue;
+
+ printk(KERN_INFO "%s: removing channel #%d\n", DRV_NAME, i);
+ unregister_sja1000dev(dev);
+ free_sja1000dev(dev);
+ }
+
+ writeb(EMS_CMD_UMAP, card->base_addr);
+
+ if (card->base_addr != NULL )
+ iounmap(card->base_addr);
+
+ kfree(card);
+
+ pdev->priv = NULL;
+}
+
+static void ems_pcmcia_card_reset(struct ems_pcmcia_card *card)
+{
+ /* Request board reset */
+ writeb(EMS_CMD_RESET, card->base_addr);
+}
+
+/*
+ * 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 == NULL) {
+ printk(KERN_ERR "%s: unable to allocate memory\n", DRV_NAME);
+ return -ENOMEM;
+ }
+
+ pdev->priv = card;
+
+ card->channels = 0;
+
+ card->base_addr = ioremap(base, EMS_PCMCIA_MEM_SIZE);
+ if (card->base_addr == NULL) {
+ err = -ENOMEM;
+ goto failure_cleanup;
+ }
+
+ /* Check for unique EMS CAN signature */
+ if (readw(card->base_addr) != 0xAA55) {
+ printk(KERN_ERR "%s: No EMS CPC Card hardware found.\n",
+ DRV_NAME);
+
+ err = -ENODEV;
+ goto failure_cleanup;
+ }
+
+ ems_pcmcia_card_reset(card);
+
+ /* 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 == NULL) {
+ err = -ENOMEM;
+ goto failure_cleanup;
+ }
+
+ card->net_dev[i] = dev;
+ priv = netdev_priv(dev);
+ priv->priv = card;
+
+ dev->irq = pdev->irq.AssignedIRQ;
+ dev->base_addr = (unsigned long)(card->base_addr
+ + EMS_PCMCIA_CAN_BASE_OFFSET
+ + (i * EMS_PCMCIA_CAN_CTRL_SIZE));
+
+ /* Check if channel is present */
+ if (ems_pcmcia_check_chan(dev)) {
+ priv->read_reg = ems_pcmcia_read_reg;
+ priv->write_reg = ems_pcmcia_write_reg;
+ priv->can.can_sys_clock = 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) {
+ printk(KERN_INFO "%s: registering device "
+ "failed (err=%d)\n", DRV_NAME, err);
+ free_sja1000dev(dev);
+ goto failure_cleanup;
+ }
+
+ card->channels++;
+
+ printk(KERN_INFO "%s: channel #%d at %lX, irq %d\n",
+ DRV_NAME, i + 1, dev->base_addr, dev->irq);
+ } else {
+ free_sja1000dev(dev);
+ }
+ }
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+ err = request_irq(dev->irq, &ems_pcmcia_interrupt, SA_SHIRQ,
+ DRV_NAME, (void *)card);
+#else
+ err = request_irq(dev->irq, &ems_pcmcia_interrupt, IRQF_SHARED,
+ DRV_NAME, (void *)card);
+#endif
+ if (err) {
+ printk(KERN_INFO "Registering device failed (err=%d)\n", err);
+
+ goto failure_cleanup;
+ }
+
+ return 0;
+
+failure_cleanup:
+ printk(KERN_ERR "Error: %d. Cleaning Up.\n", err);
+
+ 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)
+{
+ /* The io structure describes IO port mapping */
+ dev->io.NumPorts1 = 16;
+ dev->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
+ dev->io.NumPorts2 = 16;
+ dev->io.Attributes2 = IO_DATA_PATH_WIDTH_16;
+ dev->io.IOAddrLines = 5;
+
+ /* Interrupt setup */
+ dev->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING;
+ dev->irq.IRQInfo1 = IRQ_LEVEL_ID;
+
+ /* General socket configuration */
+ dev->conf.Attributes = CONF_ENABLE_IRQ;
+ dev->conf.IntType = INT_MEMORY_AND_IO;
+ dev->conf.ConfigIndex = 1;
+ dev->conf.Present = PRESENT_OPTION;
+
+ dev->win = NULL;
+
+ ems_pcmcia_config(dev);
+
+ return 0;
+}
+
+/*
+ * Configure PCMCIA socket
+ */
+static void ems_pcmcia_config(struct pcmcia_device *dev)
+{
+ win_req_t req;
+ memreq_t mem;
+
+ int csval;
+
+ /* Allocate a memory window */
+ req.Attributes = WIN_DATA_WIDTH_8|WIN_MEMORY_TYPE_CM|WIN_ENABLE;
+ req.Base = req.Size = 0;
+ req.AccessSpeed = 0;
+
+ csval = pcmcia_request_window(&dev, &req, &dev->win);
+ if (csval != CS_SUCCESS) {
+ cs_error(dev, RequestWindow, csval);
+ return;
+ }
+
+ mem.CardOffset = mem.Page = 0;
+ mem.CardOffset = dev->conf.ConfigBase;
+
+ csval = pcmcia_map_mem_page(dev->win, &mem);
+ if (csval != CS_SUCCESS) {
+ cs_error(dev, MapMemPage, csval);
+ return;
+ }
+
+ csval = pcmcia_request_irq(dev, &dev->irq);
+ if (csval != CS_SUCCESS) {
+ cs_error(dev, RequestIRQ, csval);
+ return;
+ }
+
+ /* This actually configures the PCMCIA socket */
+ csval = pcmcia_request_configuration(dev, &dev->conf);
+ if (csval != CS_SUCCESS) {
+ cs_error(dev, RequestConfiguration, csval);
+ return;
+ }
+
+ ems_pcmcia_add_card(dev, req.Base);
+}
+
+/*
+ * Release claimed resources
+ */
+static void ems_pcmcia_remove(struct pcmcia_device *dev)
+{
+ ems_pcmcia_del_card(dev);
+
+ pcmcia_disable_device(dev);
+}
+
+/*
+ * The dev_info variable is the "key" that is used to match up this
+ * device driver with appropriate cards, through the card configuration
+ * database.
+ */
+static dev_info_t dev_info = "can-ems-pcmcia";
+
+static struct pcmcia_driver ems_pcmcia_driver = {
+ .drv = {
+ .name = dev_info,
+ },
+
+ .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);
+}
+
+static void __exit ems_pcmcia_exit(void)
+{
+ pcmcia_unregister_driver(&ems_pcmcia_driver);
+}
+
+module_init(ems_pcmcia_init);
+module_exit(ems_pcmcia_exit);
+
projects / socketcan-devel.git / commitdiff