Commit a61a8423 authored by Wolfgang Grandegger's avatar Wolfgang Grandegger Committed by David S. Miller

can: SJA1000 driver for EMS PCI cards

The patch adds support for the one or two channel CPC-PCI and CPC-PCIe
cards from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
Signed-off-by: default avatarSebastian Haas <haas@ems-wuensche.com>
Signed-off-by: default avatarMarkus Plessing <plessing@ems-wuensche.com>
Signed-off-by: default avatarWolfgang Grandegger <wg@grandegger.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f534e52f
...@@ -51,6 +51,13 @@ config CAN_SJA1000_PLATFORM ...@@ -51,6 +51,13 @@ config CAN_SJA1000_PLATFORM
boards from Phytec (http://www.phytec.de) like the PCM027, boards from Phytec (http://www.phytec.de) like the PCM027,
PCM038. PCM038.
config CAN_EMS_PCI
tristate "EMS CPC-PCI and CPC-PCIe Card"
depends on PCI && CAN_SJA1000
---help---
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_DEBUG_DEVICES config CAN_DEBUG_DEVICES
bool "CAN devices debugging messages" bool "CAN devices debugging messages"
depends on CAN depends on CAN
......
...@@ -4,5 +4,6 @@ ...@@ -4,5 +4,6 @@
obj-$(CONFIG_CAN_SJA1000) += sja1000.o obj-$(CONFIG_CAN_SJA1000) += sja1000.o
obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o obj-$(CONFIG_CAN_SJA1000_PLATFORM) += sja1000_platform.o
obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
/*
* Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
* Copyright (C) 2008 Markus Plessing <plessing@ems-wuensche.com>
* 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/pci.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/io.h>
#include "sja1000.h"
#define DRV_NAME "ems_pci"
MODULE_AUTHOR("Sebastian Haas <haas@ems-wuenche.com>");
MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-PCI/PCIe CAN cards");
MODULE_SUPPORTED_DEVICE("EMS CPC-PCI/PCIe CAN card");
MODULE_LICENSE("GPL v2");
#define EMS_PCI_MAX_CHAN 2
struct ems_pci_card {
int channels;
struct pci_dev *pci_dev;
struct net_device *net_dev[EMS_PCI_MAX_CHAN];
void __iomem *conf_addr;
void __iomem *base_addr;
};
#define EMS_PCI_CAN_CLOCK (16000000 / 2)
/*
* Register definitions and descriptions are from LinCAN 0.3.3.
*
* PSB4610 PITA-2 bridge control registers
*/
#define PITA2_ICR 0x00 /* Interrupt Control Register */
#define PITA2_ICR_INT0 0x00000002 /* [RC] INT0 Active/Clear */
#define PITA2_ICR_INT0_EN 0x00020000 /* [RW] Enable INT0 */
#define PITA2_MISC 0x1c /* Miscellaneous Register */
#define PITA2_MISC_CONFIG 0x04000000 /* Multiplexed parallel interface */
/*
* 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_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 7
* (meaning direct oscillator output) because the second SJA1000 chip
* is driven by the first one CLKOUT output.
*/
#define EMS_PCI_CDR (CDR_CBP | CDR_CLKOUT_MASK)
#define EMS_PCI_MEM_SIZE 4096 /* Size of the remapped io-memory */
#define EMS_PCI_CAN_BASE_OFFSET 0x400 /* offset where the controllers starts */
#define EMS_PCI_CAN_CTRL_SIZE 0x200 /* memory size for each controller */
#define EMS_PCI_PORT_BYTES 0x4 /* Each register occupies 4 bytes */
#define EMS_PCI_VENDOR_ID 0x110a /* PCI device and vendor ID */
#define EMS_PCI_DEVICE_ID 0x2104
static struct pci_device_id ems_pci_tbl[] = {
{EMS_PCI_VENDOR_ID, EMS_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{0,}
};
MODULE_DEVICE_TABLE(pci, ems_pci_tbl);
/*
* Helper to read internal registers from card logic (not CAN)
*/
static u8 ems_pci_readb(struct ems_pci_card *card, unsigned int port)
{
return readb((void __iomem *)card->base_addr
+ (port * EMS_PCI_PORT_BYTES));
}
static u8 ems_pci_read_reg(const struct net_device *dev, int port)
{
return readb((void __iomem *)dev->base_addr
+ (port * EMS_PCI_PORT_BYTES));
}
static void ems_pci_write_reg(const struct net_device *dev, int port, u8 val)
{
writeb(val, (void __iomem *)dev->base_addr
+ (port * EMS_PCI_PORT_BYTES));
}
static void ems_pci_post_irq(const struct net_device *dev)
{
struct sja1000_priv *priv = netdev_priv(dev);
struct ems_pci_card *card = (struct ems_pci_card *)priv->priv;
/* reset int flag of pita */
writel(PITA2_ICR_INT0_EN | PITA2_ICR_INT0, card->conf_addr
+ PITA2_ICR);
}
/*
* Check if a CAN controller is present at the specified location
* by trying to set 'em into the PeliCAN mode
*/
static inline int ems_pci_check_chan(struct net_device *dev)
{
unsigned char res;
/* Make sure SJA1000 is in reset mode */
ems_pci_write_reg(dev, REG_MOD, 1);
ems_pci_write_reg(dev, REG_CDR, CDR_PELICAN);
/* read reset-values */
res = ems_pci_read_reg(dev, REG_CDR);
if (res == CDR_PELICAN)
return 1;
return 0;
}
static void ems_pci_del_card(struct pci_dev *pdev)
{
struct ems_pci_card *card = pci_get_drvdata(pdev);
struct net_device *dev;
int i = 0;
for (i = 0; i < card->channels; i++) {
dev = card->net_dev[i];
if (!dev)
continue;
dev_info(&pdev->dev, "Removing %s.\n", dev->name);
unregister_sja1000dev(dev);
free_sja1000dev(dev);
}
if (card->base_addr != NULL)
pci_iounmap(card->pci_dev, card->base_addr);
if (card->conf_addr != NULL)
pci_iounmap(card->pci_dev, card->conf_addr);
kfree(card);
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
}
static void ems_pci_card_reset(struct ems_pci_card *card)
{
/* Request board reset */
writeb(0, 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_pci_add_card(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct sja1000_priv *priv;
struct net_device *dev;
struct ems_pci_card *card;
int err, i;
/* Enabling PCI device */
if (pci_enable_device(pdev) < 0) {
dev_err(&pdev->dev, "Enabling PCI device failed\n");
return -ENODEV;
}
/* Allocating card structures to hold addresses, ... */
card = kzalloc(sizeof(struct ems_pci_card), GFP_KERNEL);
if (card == NULL) {
dev_err(&pdev->dev, "Unable to allocate memory\n");
pci_disable_device(pdev);
return -ENOMEM;
}
pci_set_drvdata(pdev, card);
card->pci_dev = pdev;
card->channels = 0;
/* Remap PITA configuration space, and controller memory area */
card->conf_addr = pci_iomap(pdev, 0, EMS_PCI_MEM_SIZE);
if (card->conf_addr == NULL) {
err = -ENOMEM;
goto failure_cleanup;
}
card->base_addr = pci_iomap(pdev, 1, EMS_PCI_MEM_SIZE);
if (card->base_addr == NULL) {
err = -ENOMEM;
goto failure_cleanup;
}
/* Configure PITA-2 parallel interface (enable MUX) */
writel(PITA2_MISC_CONFIG, card->conf_addr + PITA2_MISC);
/* Check for unique EMS CAN signature */
if (ems_pci_readb(card, 0) != 0x55 ||
ems_pci_readb(card, 1) != 0xAA ||
ems_pci_readb(card, 2) != 0x01 ||
ems_pci_readb(card, 3) != 0xCB ||
ems_pci_readb(card, 4) != 0x11) {
dev_err(&pdev->dev, "Not EMS Dr. Thomas Wuensche interface\n");
err = -ENODEV;
goto failure_cleanup;
}
ems_pci_card_reset(card);
/* Detect available channels */
for (i = 0; i < EMS_PCI_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;
priv->irq_flags = IRQF_SHARED;
dev->irq = pdev->irq;
dev->base_addr = (unsigned long)(card->base_addr
+ EMS_PCI_CAN_BASE_OFFSET
+ (i * EMS_PCI_CAN_CTRL_SIZE));
/* Check if channel is present */
if (ems_pci_check_chan(dev)) {
priv->read_reg = ems_pci_read_reg;
priv->write_reg = ems_pci_write_reg;
priv->post_irq = ems_pci_post_irq;
priv->can.clock.freq = EMS_PCI_CAN_CLOCK;
priv->ocr = EMS_PCI_OCR;
priv->cdr = EMS_PCI_CDR;
SET_NETDEV_DEV(dev, &pdev->dev);
/* Enable interrupts from card */
writel(PITA2_ICR_INT0_EN, card->conf_addr + PITA2_ICR);
/* Register SJA1000 device */
err = register_sja1000dev(dev);
if (err) {
dev_err(&pdev->dev, "Registering device failed "
"(err=%d)\n", err);
free_sja1000dev(dev);
goto failure_cleanup;
}
card->channels++;
dev_info(&pdev->dev, "Channel #%d at %#lX, irq %d\n",
i + 1, dev->base_addr,
dev->irq);
} else {
free_sja1000dev(dev);
}
}
return 0;
failure_cleanup:
dev_err(&pdev->dev, "Error: %d. Cleaning Up.\n", err);
ems_pci_del_card(pdev);
return err;
}
static struct pci_driver ems_pci_driver = {
.name = DRV_NAME,
.id_table = ems_pci_tbl,
.probe = ems_pci_add_card,
.remove = ems_pci_del_card,
};
static int __init ems_pci_init(void)
{
return pci_register_driver(&ems_pci_driver);
}
static void __exit ems_pci_exit(void)
{
pci_unregister_driver(&ems_pci_driver);
}
module_init(ems_pci_init);
module_exit(ems_pci_exit);
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