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can: sja1000: legacy SJA1000 ISA bus driver
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This patch adds support for legacy SJA1000 CAN controllers on the ISA
or PC-104 bus. The I/O port or memory address and the IRQ number must
be specified via module parameters:

  insmod sja1000_isa.ko port=0x310,0x380 irq=7,11

for ISA devices using I/O ports or:

  insmod sja1000_isa.ko mem=0xd1000,0xd1000 irq=7,11

for memory mapped ISA devices.

Indirect access via address and data port is supported as well:

  insmod sja1000_isa.ko port=0x310,0x380 indirect=1 irq=7,11

Here is a full list of the supported module parameters:

  port:I/O port number (array of ulong)
  mem:I/O memory address (array of ulong)
  indirect:Indirect access via address and data port (array of byte)
  irq:IRQ number (array of int)
  clk:External oscillator clock frequency (default=16000000 [16 MHz])
      (array of int)
  cdr:Clock divider register (default=0x48 [CDR_CBP | CDR_CLK_OFF])
      (array of byte)
  ocr:Output clock register (default=0x18 [OCR_TX0_PUSHPULL])
      (array of byte)

Note: for clk, cdr, ocr, the first argument re-defines the default
for all other devices, e.g.:

 insmod sja1000_isa.ko mem=0xd1000,0xd1000 irq=7,11 clk=24000000

is equivalent to

 insmod sja1000_isa.ko mem=0xd1000,0xd1000 irq=7,11 \
                       clk=24000000,24000000

Signed-off-by: Wolfgang Grandegger <[email protected]>
Tested-by: Oliver Hartkopp <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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@grandwolf @davem330
grandwolf authored and davem330 committed Sep 4, 2009
1 parent 8935f57 commit 2a6ba39
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7 changes: 7 additions & 0 deletions drivers/net/can/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,13 @@ config CAN_SJA1000
---help---
Driver for the SJA1000 CAN controllers from Philips or NXP

config CAN_SJA1000_ISA
depends on CAN_SJA1000 && ISA
tristate "ISA Bus based legacy SJA1000 driver"
---help---
This driver adds legacy support for SJA1000 chips connected to
the ISA bus using I/O port, memory mapped or indirect access.

config CAN_SJA1000_PLATFORM
depends on CAN_SJA1000
tristate "Generic Platform Bus based SJA1000 driver"
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1 change: 1 addition & 0 deletions drivers/net/can/sja1000/Makefile
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Expand Up @@ -3,6 +3,7 @@
#

obj-$(CONFIG_CAN_SJA1000) += sja1000.o
obj-$(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_PCI) += ems_pci.o
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281 changes: 281 additions & 0 deletions drivers/net/can/sja1000/sja1000_isa.c
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@@ -0,0 +1,281 @@
/*
* Copyright (C) 2009 Wolfgang Grandegger <[email protected]>
*
* 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/isa.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/platform/sja1000.h>

#include "sja1000.h"

#define DRV_NAME "sja1000_isa"

#define MAXDEV 8

MODULE_AUTHOR("Wolfgang Grandegger <[email protected]>");
MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
MODULE_LICENSE("GPL v2");

#define CLK_DEFAULT 16000000 /* 16 MHz */
#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)
#define OCR_DEFAULT OCR_TX0_PUSHPULL

static unsigned long port[MAXDEV];
static unsigned long mem[MAXDEV];
static int __devinitdata irq[MAXDEV];
static int __devinitdata clk[MAXDEV];
static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};

module_param_array(port, ulong, NULL, S_IRUGO);
MODULE_PARM_DESC(port, "I/O port number");

module_param_array(mem, ulong, NULL, S_IRUGO);
MODULE_PARM_DESC(mem, "I/O memory address");

module_param_array(indirect, byte, NULL, S_IRUGO);
MODULE_PARM_DESC(indirect, "Indirect access via address and data port");

module_param_array(irq, int, NULL, S_IRUGO);
MODULE_PARM_DESC(irq, "IRQ number");

module_param_array(clk, int, NULL, S_IRUGO);
MODULE_PARM_DESC(clk, "External oscillator clock frequency "
"(default=16000000 [16 MHz])");

module_param_array(cdr, byte, NULL, S_IRUGO);
MODULE_PARM_DESC(cdr, "Clock divider register "
"(default=0x48 [CDR_CBP | CDR_CLK_OFF])");

module_param_array(ocr, byte, NULL, S_IRUGO);
MODULE_PARM_DESC(ocr, "Output control register "
"(default=0x18 [OCR_TX0_PUSHPULL])");

#define SJA1000_IOSIZE 0x20
#define SJA1000_IOSIZE_INDIRECT 0x02

static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
{
return readb(priv->reg_base + reg);
}

static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
int reg, u8 val)
{
writeb(val, priv->reg_base + reg);
}

static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
{
return inb((unsigned long)priv->reg_base + reg);
}

static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
int reg, u8 val)
{
outb(val, (unsigned long)priv->reg_base + reg);
}

static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
int reg)
{
unsigned long base = (unsigned long)priv->reg_base;

outb(reg, base);
return inb(base + 1);
}

static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
int reg, u8 val)
{
unsigned long base = (unsigned long)priv->reg_base;

outb(reg, base);
outb(val, base + 1);
}

static int __devinit sja1000_isa_match(struct device *pdev, unsigned int idx)
{
if (port[idx] || mem[idx]) {
if (irq[idx])
return 1;
} else if (idx)
return 0;

dev_err(pdev, "insufficient parameters supplied\n");
return 0;
}

static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx)
{
struct net_device *dev;
struct sja1000_priv *priv;
void __iomem *base = NULL;
int iosize = SJA1000_IOSIZE;
int err;

if (mem[idx]) {
if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
err = -EBUSY;
goto exit;
}
base = ioremap_nocache(mem[idx], iosize);
if (!base) {
err = -ENOMEM;
goto exit_release;
}
} else {
if (indirect[idx] > 0 ||
(indirect[idx] == -1 && indirect[0] > 0))
iosize = SJA1000_IOSIZE_INDIRECT;
if (!request_region(port[idx], iosize, DRV_NAME)) {
err = -EBUSY;
goto exit;
}
}

dev = alloc_sja1000dev(0);
if (!dev) {
err = -ENOMEM;
goto exit_unmap;
}
priv = netdev_priv(dev);

dev->irq = irq[idx];
priv->irq_flags = IRQF_SHARED;
if (mem[idx]) {
priv->reg_base = base;
dev->base_addr = mem[idx];
priv->read_reg = sja1000_isa_mem_read_reg;
priv->write_reg = sja1000_isa_mem_write_reg;
} else {
priv->reg_base = (void __iomem *)port[idx];
dev->base_addr = port[idx];

if (iosize == SJA1000_IOSIZE_INDIRECT) {
priv->read_reg = sja1000_isa_port_read_reg_indirect;
priv->write_reg = sja1000_isa_port_write_reg_indirect;
} else {
priv->read_reg = sja1000_isa_port_read_reg;
priv->write_reg = sja1000_isa_port_write_reg;
}
}

if (clk[idx])
priv->can.clock.freq = clk[idx] / 2;
else if (clk[0])
priv->can.clock.freq = clk[0] / 2;
else
priv->can.clock.freq = CLK_DEFAULT / 2;

if (ocr[idx] != -1)
priv->ocr = ocr[idx] & 0xff;
else if (ocr[0] != -1)
priv->ocr = ocr[0] & 0xff;
else
priv->ocr = OCR_DEFAULT;

if (cdr[idx] != -1)
priv->cdr = cdr[idx] & 0xff;
else if (cdr[0] != -1)
priv->cdr = cdr[0] & 0xff;
else
priv->cdr = CDR_DEFAULT;

dev_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, pdev);

err = register_sja1000dev(dev);
if (err) {
dev_err(pdev, "registering %s failed (err=%d)\n",
DRV_NAME, err);
goto exit_unmap;
}

dev_info(pdev, "%s device registered (reg_base=0x%p, irq=%d)\n",
DRV_NAME, priv->reg_base, dev->irq);
return 0;

exit_unmap:
if (mem[idx])
iounmap(base);
exit_release:
if (mem[idx])
release_mem_region(mem[idx], iosize);
else
release_region(port[idx], iosize);
exit:
return err;
}

static int __devexit sja1000_isa_remove(struct device *pdev, unsigned int idx)
{
struct net_device *dev = dev_get_drvdata(pdev);
struct sja1000_priv *priv = netdev_priv(dev);

unregister_sja1000dev(dev);
dev_set_drvdata(pdev, NULL);

if (mem[idx]) {
iounmap(priv->reg_base);
release_mem_region(mem[idx], SJA1000_IOSIZE);
} else {
if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
else
release_region(port[idx], SJA1000_IOSIZE);
}
free_sja1000dev(dev);

return 0;
}

static struct isa_driver sja1000_isa_driver = {
.match = sja1000_isa_match,
.probe = sja1000_isa_probe,
.remove = __devexit_p(sja1000_isa_remove),
.driver = {
.name = DRV_NAME,
},
};

static int __init sja1000_isa_init(void)
{
int err = isa_register_driver(&sja1000_isa_driver, MAXDEV);

if (!err)
printk(KERN_INFO
"Legacy %s driver for max. %d devices registered\n",
DRV_NAME, MAXDEV);
return err;
}

static void __exit sja1000_isa_exit(void)
{
isa_unregister_driver(&sja1000_isa_driver);
}

module_init(sja1000_isa_init);
module_exit(sja1000_isa_exit);

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