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2a6ba39ad6
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 <wg@grandegger.com>
Tested-by: Oliver Hartkopp <oliver@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
282 lines
7.0 KiB
C
282 lines
7.0 KiB
C
/*
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* Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the version 2 of the GNU General Public License
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/isa.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include <linux/can/platform/sja1000.h>
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#include "sja1000.h"
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#define DRV_NAME "sja1000_isa"
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#define MAXDEV 8
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MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
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MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
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MODULE_LICENSE("GPL v2");
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#define CLK_DEFAULT 16000000 /* 16 MHz */
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#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)
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#define OCR_DEFAULT OCR_TX0_PUSHPULL
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static unsigned long port[MAXDEV];
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static unsigned long mem[MAXDEV];
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static int __devinitdata irq[MAXDEV];
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static int __devinitdata clk[MAXDEV];
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static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
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static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
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static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
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module_param_array(port, ulong, NULL, S_IRUGO);
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MODULE_PARM_DESC(port, "I/O port number");
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module_param_array(mem, ulong, NULL, S_IRUGO);
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MODULE_PARM_DESC(mem, "I/O memory address");
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module_param_array(indirect, byte, NULL, S_IRUGO);
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MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
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module_param_array(irq, int, NULL, S_IRUGO);
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MODULE_PARM_DESC(irq, "IRQ number");
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module_param_array(clk, int, NULL, S_IRUGO);
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MODULE_PARM_DESC(clk, "External oscillator clock frequency "
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"(default=16000000 [16 MHz])");
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module_param_array(cdr, byte, NULL, S_IRUGO);
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MODULE_PARM_DESC(cdr, "Clock divider register "
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"(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
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module_param_array(ocr, byte, NULL, S_IRUGO);
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MODULE_PARM_DESC(ocr, "Output control register "
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"(default=0x18 [OCR_TX0_PUSHPULL])");
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#define SJA1000_IOSIZE 0x20
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#define SJA1000_IOSIZE_INDIRECT 0x02
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static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
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{
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return readb(priv->reg_base + reg);
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}
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static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
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int reg, u8 val)
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{
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writeb(val, priv->reg_base + reg);
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}
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static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
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{
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return inb((unsigned long)priv->reg_base + reg);
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}
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static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
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int reg, u8 val)
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{
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outb(val, (unsigned long)priv->reg_base + reg);
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}
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static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
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int reg)
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{
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unsigned long base = (unsigned long)priv->reg_base;
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outb(reg, base);
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return inb(base + 1);
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}
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static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
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int reg, u8 val)
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{
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unsigned long base = (unsigned long)priv->reg_base;
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outb(reg, base);
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outb(val, base + 1);
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}
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static int __devinit sja1000_isa_match(struct device *pdev, unsigned int idx)
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{
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if (port[idx] || mem[idx]) {
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if (irq[idx])
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return 1;
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} else if (idx)
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return 0;
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dev_err(pdev, "insufficient parameters supplied\n");
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return 0;
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}
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static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx)
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{
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struct net_device *dev;
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struct sja1000_priv *priv;
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void __iomem *base = NULL;
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int iosize = SJA1000_IOSIZE;
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int err;
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if (mem[idx]) {
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if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
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err = -EBUSY;
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goto exit;
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}
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base = ioremap_nocache(mem[idx], iosize);
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if (!base) {
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err = -ENOMEM;
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goto exit_release;
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}
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} else {
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if (indirect[idx] > 0 ||
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(indirect[idx] == -1 && indirect[0] > 0))
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iosize = SJA1000_IOSIZE_INDIRECT;
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if (!request_region(port[idx], iosize, DRV_NAME)) {
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err = -EBUSY;
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goto exit;
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}
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}
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dev = alloc_sja1000dev(0);
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if (!dev) {
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err = -ENOMEM;
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goto exit_unmap;
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}
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priv = netdev_priv(dev);
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dev->irq = irq[idx];
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priv->irq_flags = IRQF_SHARED;
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if (mem[idx]) {
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priv->reg_base = base;
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dev->base_addr = mem[idx];
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priv->read_reg = sja1000_isa_mem_read_reg;
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priv->write_reg = sja1000_isa_mem_write_reg;
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} else {
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priv->reg_base = (void __iomem *)port[idx];
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dev->base_addr = port[idx];
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if (iosize == SJA1000_IOSIZE_INDIRECT) {
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priv->read_reg = sja1000_isa_port_read_reg_indirect;
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priv->write_reg = sja1000_isa_port_write_reg_indirect;
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} else {
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priv->read_reg = sja1000_isa_port_read_reg;
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priv->write_reg = sja1000_isa_port_write_reg;
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}
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}
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if (clk[idx])
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priv->can.clock.freq = clk[idx] / 2;
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else if (clk[0])
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priv->can.clock.freq = clk[0] / 2;
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else
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priv->can.clock.freq = CLK_DEFAULT / 2;
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if (ocr[idx] != -1)
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priv->ocr = ocr[idx] & 0xff;
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else if (ocr[0] != -1)
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priv->ocr = ocr[0] & 0xff;
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else
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priv->ocr = OCR_DEFAULT;
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if (cdr[idx] != -1)
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priv->cdr = cdr[idx] & 0xff;
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else if (cdr[0] != -1)
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priv->cdr = cdr[0] & 0xff;
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else
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priv->cdr = CDR_DEFAULT;
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dev_set_drvdata(pdev, dev);
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SET_NETDEV_DEV(dev, pdev);
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err = register_sja1000dev(dev);
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if (err) {
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dev_err(pdev, "registering %s failed (err=%d)\n",
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DRV_NAME, err);
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goto exit_unmap;
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}
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dev_info(pdev, "%s device registered (reg_base=0x%p, irq=%d)\n",
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DRV_NAME, priv->reg_base, dev->irq);
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return 0;
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exit_unmap:
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if (mem[idx])
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iounmap(base);
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exit_release:
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if (mem[idx])
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release_mem_region(mem[idx], iosize);
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else
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release_region(port[idx], iosize);
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exit:
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return err;
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}
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static int __devexit sja1000_isa_remove(struct device *pdev, unsigned int idx)
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{
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struct net_device *dev = dev_get_drvdata(pdev);
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struct sja1000_priv *priv = netdev_priv(dev);
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unregister_sja1000dev(dev);
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dev_set_drvdata(pdev, NULL);
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if (mem[idx]) {
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iounmap(priv->reg_base);
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release_mem_region(mem[idx], SJA1000_IOSIZE);
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} else {
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if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
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release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
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else
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release_region(port[idx], SJA1000_IOSIZE);
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}
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free_sja1000dev(dev);
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return 0;
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}
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static struct isa_driver sja1000_isa_driver = {
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.match = sja1000_isa_match,
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.probe = sja1000_isa_probe,
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.remove = __devexit_p(sja1000_isa_remove),
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.driver = {
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.name = DRV_NAME,
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},
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};
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static int __init sja1000_isa_init(void)
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{
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int err = isa_register_driver(&sja1000_isa_driver, MAXDEV);
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if (!err)
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printk(KERN_INFO
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"Legacy %s driver for max. %d devices registered\n",
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DRV_NAME, MAXDEV);
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return err;
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}
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static void __exit sja1000_isa_exit(void)
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{
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isa_unregister_driver(&sja1000_isa_driver);
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}
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module_init(sja1000_isa_init);
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module_exit(sja1000_isa_exit);
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