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/*
* Copyright (C) 2008 David Müller, <d.mueller@elsoft.ch>
*
* 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/platform_device.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/io.h>
#include "sja1000.h"
#define DRV_NAME "pipcan"
MODULE_AUTHOR("David Müller <d.mueller@elsoft.ch>");
MODULE_DESCRIPTION("Socket-CAN driver for MPL PIPCAN module");
MODULE_SUPPORTED_DEVICE("MPL PIPCAN module");
MODULE_LICENSE("GPL v2");
#define PIPCAN_CAN_CLOCK (16000000 / 2)
#define PIPCAN_OCR (OCR_TX1_PUSHPULL)
#define PIPCAN_CDR (CDR_CBP | CDR_CLK_OFF)
#define PIPCAN_IOSIZE (0x100)
#define PIPCAN_RES (0x804)
#define PIPCAN_RST (0x805)
static u8 pc_read_reg(struct net_device *dev, int reg)
{
return inb(dev->base_addr + reg);
}
static void pc_write_reg(struct net_device *dev, int reg, u8 val)
{
outb(val, dev->base_addr + reg);
}
static int __init pc_probe(struct platform_device *pdev)
{
struct net_device *dev;
struct sja1000_priv *priv;
struct resource *res;
int rc, irq;
rc = -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
irq = platform_get_irq(pdev, 0);
if (!res || !irq)
goto exit;
rc = -EBUSY;
if (!request_region(res->start, res->end - res->start + 1, DRV_NAME))
goto exit;
rc = -ENOMEM;
dev = alloc_sja1000dev(0);
if (!dev)
goto exit_release;
priv = netdev_priv(dev);
priv->read_reg = pc_read_reg;
priv->write_reg = pc_write_reg;
priv->can.bittiming.clock = PIPCAN_CAN_CLOCK;
priv->ocr = PIPCAN_OCR;
priv->cdr = PIPCAN_CDR;
dev->irq = irq;
dev->base_addr = res->start;
dev_set_drvdata(&pdev->dev, dev);
/* deactivate RST */
outb(inb(PIPCAN_RST) & ~0x01, PIPCAN_RST);
rc = register_sja1000dev(dev);
if (rc) {
dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
DRV_NAME, rc);
goto exit_free;
}
dev_info(&pdev->dev, "device registered (base_addr=%#lx, irq=%d)\n",
dev->base_addr, dev->irq);
return 0;
exit_free:
free_sja1000dev(dev);
exit_release:
release_region(res->start, res->end - res->start + 1);
exit:
return rc;
}
static int __exit pc_remove(struct platform_device *pdev)
{
struct net_device *dev = dev_get_drvdata(&pdev->dev);
struct resource *res;
dev_set_drvdata(&pdev->dev, NULL);
unregister_sja1000dev(dev);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
free_sja1000dev(dev);
release_region(res->start, res->end - res->start + 1);
/* activate RST */
outb(inb(PIPCAN_RST) | 0x01, PIPCAN_RST);
return 0;
}
static struct platform_driver pc_driver = {
.remove = __exit_p(pc_remove),
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
static struct platform_device *pc_pdev;
static const u16 pipcan_ioport[] = {0x1000, 0x8000, 0xE000};
static int __init pc_init(void)
{
struct resource r[2];
int rc, addr, irq, idx;
u8 pc_res;
/* get PIPCAN resources from EPLD */
pc_res = inb(PIPCAN_RES);
idx = (pc_res & 0x0F);
if ((idx <= 0) || (idx > ARRAY_SIZE(pipcan_ioport))) {
printk(KERN_ERR DRV_NAME " invalid base address\n");
return -EINVAL;
}
addr = pipcan_ioport[idx-1];
irq = (pc_res >> 4) & 0x0F;
if ((irq < 3) || (irq == 8) || (irq == 13)) {
printk(KERN_ERR DRV_NAME " invalid IRQ\n");
return -EINVAL;
}
/* fill in resources */
r[0].start = addr;
r[0].end = addr + PIPCAN_IOSIZE - 1;
r[0].name = DRV_NAME;
r[0].flags = IORESOURCE_IO;
r[1].start = r[1].end = irq;
r[1].name = DRV_NAME;
r[1].flags = IORESOURCE_IRQ;
pc_pdev = platform_device_register_simple(DRV_NAME, 0, r,
ARRAY_SIZE(r));
if (IS_ERR(pc_pdev))
return PTR_ERR(pc_pdev);
rc = platform_driver_probe(&pc_driver, pc_probe);
if (rc) {
platform_device_unregister(pc_pdev);
printk(KERN_ERR DRV_NAME
" platform_driver_probe() failed (%d)\n", rc);
}
return rc;
}
static void __exit pc_exit(void)
{
platform_driver_unregister(&pc_driver);
platform_device_unregister(pc_pdev);
}
module_init(pc_init);
module_exit(pc_exit);
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