/* * 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/platform_device.h> #include <linux/interrupt.h> #include <linux/netdevice.h> #include <linux/delay.h> #include <linux/irq.h> #include <linux/io.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 unsigned char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; static unsigned char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; static int __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, int, 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 struct platform_device *sja1000_isa_devs[MAXDEV]; 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_probe(struct platform_device *pdev) { struct net_device *dev; struct sja1000_priv *priv; void __iomem *base = NULL; int iosize = SJA1000_IOSIZE; int idx = pdev->id; int err; dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n", idx, port[idx], mem[idx], irq[idx]); 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] != 0xff) priv->ocr = ocr[idx]; else if (ocr[0] != 0xff) priv->ocr = ocr[0]; else priv->ocr = OCR_DEFAULT; if (cdr[idx] != 0xff) priv->cdr = cdr[idx]; else if (cdr[0] != 0xff) priv->cdr = cdr[0]; else priv->cdr = CDR_DEFAULT; dev_set_drvdata(&pdev->dev, dev); SET_NETDEV_DEV(dev, &pdev->dev); err = register_sja1000dev(dev); if (err) { dev_err(&pdev->dev, "registering %s failed (err=%d)\n", DRV_NAME, err); goto exit_unmap; } dev_info(&pdev->dev, "%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 platform_device *pdev) { struct net_device *dev = dev_get_drvdata(&pdev->dev); struct sja1000_priv *priv = netdev_priv(dev); int idx = pdev->id; unregister_sja1000dev(dev); dev_set_drvdata(&pdev->dev, 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 platform_driver sja1000_isa_driver = { .probe = sja1000_isa_probe, .remove = __devexit_p(sja1000_isa_remove), .driver = { .name = DRV_NAME, .owner = THIS_MODULE, }, }; static int __init sja1000_isa_init(void) { int idx, err; for (idx = 0; idx < MAXDEV; idx++) { if ((port[idx] || mem[idx]) && irq[idx]) { sja1000_isa_devs[idx] = platform_device_alloc(DRV_NAME, idx); if (!sja1000_isa_devs[idx]) { err = -ENOMEM; goto exit_free_devices; } err = platform_device_add(sja1000_isa_devs[idx]); if (err) { platform_device_put(sja1000_isa_devs[idx]); goto exit_free_devices; } pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, " "irq=%d\n", DRV_NAME, idx, port[idx], mem[idx], irq[idx]); } else if (idx == 0 || port[idx] || mem[idx]) { pr_err("%s: insufficient parameters supplied\n", DRV_NAME); err = -EINVAL; goto exit_free_devices; } } err = platform_driver_register(&sja1000_isa_driver); if (err) goto exit_free_devices; pr_info("Legacy %s driver for max. %d devices registered\n", DRV_NAME, MAXDEV); return 0; exit_free_devices: while (--idx >= 0) { if (sja1000_isa_devs[idx]) platform_device_unregister(sja1000_isa_devs[idx]); } return err; } static void __exit sja1000_isa_exit(void) { int idx; platform_driver_unregister(&sja1000_isa_driver); for (idx = 0; idx < MAXDEV; idx++) { if (sja1000_isa_devs[idx]) platform_device_unregister(sja1000_isa_devs[idx]); } } module_init(sja1000_isa_init); module_exit(sja1000_isa_exit);