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- /*
- * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.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/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 <wg@grandegger.com>");
- 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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