/* * Driver for CC770 and AN82527 CAN controllers on the legacy ISA bus * * Copyright (C) 2009, 2011 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. */ /* * Bosch CC770 and Intel AN82527 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 cc770_isa.ko port=0x310,0x380 irq=7,11 * * for ISA devices using I/O ports or: * * insmod cc770_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 cc770_isa.ko port=0x310,0x380 indirect=1 irq=7,11 * * Furthermore, the following mode parameter can be defined: * * clk: External oscillator clock frequency (default=16000000 [16 MHz]) * cir: CPU interface register (default=0x40 [DSC]) * bcr: Bus configuration register (default=0x40 [CBY]) * cor: Clockout register (default=0x00) * * Note: for clk, cir, bcr and cor, the first argument re-defines the * default for all other devices, e.g.: * * insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11 clk=24000000 * * is equivalent to * * insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11 clk=24000000,24000000 */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #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.h> #include <linux/can/dev.h> #include <linux/can/platform/cc770.h> #include "cc770.h" #define MAXDEV 8 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the ISA bus"); MODULE_LICENSE("GPL v2"); #define CLK_DEFAULT 16000000 /* 16 MHz */ #define COR_DEFAULT 0x00 #define BCR_DEFAULT BUSCFG_CBY static unsigned long port[MAXDEV]; static unsigned long mem[MAXDEV]; static int __devinitdata irq[MAXDEV]; static int __devinitdata clk[MAXDEV]; static u8 __devinitdata cir[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; static u8 __devinitdata cor[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; static u8 __devinitdata bcr[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(cir, byte, NULL, S_IRUGO); MODULE_PARM_DESC(cir, "CPU interface register (default=0x40 [DSC])"); module_param_array(cor, byte, NULL, S_IRUGO); MODULE_PARM_DESC(cor, "Clockout register (default=0x00)"); module_param_array(bcr, byte, NULL, S_IRUGO); MODULE_PARM_DESC(bcr, "Bus configuration register (default=0x40 [CBY])"); #define CC770_IOSIZE 0x20 #define CC770_IOSIZE_INDIRECT 0x02 /* Spinlock for cc770_isa_port_write_reg_indirect * and cc770_isa_port_read_reg_indirect */ static DEFINE_SPINLOCK(cc770_isa_port_lock); static struct platform_device *cc770_isa_devs[MAXDEV]; static u8 cc770_isa_mem_read_reg(const struct cc770_priv *priv, int reg) { return readb(priv->reg_base + reg); } static void cc770_isa_mem_write_reg(const struct cc770_priv *priv, int reg, u8 val) { writeb(val, priv->reg_base + reg); } static u8 cc770_isa_port_read_reg(const struct cc770_priv *priv, int reg) { return inb((unsigned long)priv->reg_base + reg); } static void cc770_isa_port_write_reg(const struct cc770_priv *priv, int reg, u8 val) { outb(val, (unsigned long)priv->reg_base + reg); } static u8 cc770_isa_port_read_reg_indirect(const struct cc770_priv *priv, int reg) { unsigned long base = (unsigned long)priv->reg_base; unsigned long flags; u8 val; spin_lock_irqsave(&cc770_isa_port_lock, flags); outb(reg, base); val = inb(base + 1); spin_unlock_irqrestore(&cc770_isa_port_lock, flags); return val; } static void cc770_isa_port_write_reg_indirect(const struct cc770_priv *priv, int reg, u8 val) { unsigned long base = (unsigned long)priv->reg_base; unsigned long flags; spin_lock_irqsave(&cc770_isa_port_lock, flags); outb(reg, base); outb(val, base + 1); spin_unlock_irqrestore(&cc770_isa_port_lock, flags); } static int __devinit cc770_isa_probe(struct platform_device *pdev) { struct net_device *dev; struct cc770_priv *priv; void __iomem *base = NULL; int iosize = CC770_IOSIZE; int idx = pdev->id; int err; u32 clktmp; 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, KBUILD_MODNAME)) { 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 = CC770_IOSIZE_INDIRECT; if (!request_region(port[idx], iosize, KBUILD_MODNAME)) { err = -EBUSY; goto exit; } } dev = alloc_cc770dev(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 = cc770_isa_mem_read_reg; priv->write_reg = cc770_isa_mem_write_reg; } else { priv->reg_base = (void __iomem *)port[idx]; dev->base_addr = port[idx]; if (iosize == CC770_IOSIZE_INDIRECT) { priv->read_reg = cc770_isa_port_read_reg_indirect; priv->write_reg = cc770_isa_port_write_reg_indirect; } else { priv->read_reg = cc770_isa_port_read_reg; priv->write_reg = cc770_isa_port_write_reg; } } if (clk[idx]) clktmp = clk[idx]; else if (clk[0]) clktmp = clk[0]; else clktmp = CLK_DEFAULT; priv->can.clock.freq = clktmp; if (cir[idx] != 0xff) { priv->cpu_interface = cir[idx]; } else if (cir[0] != 0xff) { priv->cpu_interface = cir[0]; } else { /* The system clock may not exceed 10 MHz */ if (clktmp > 10000000) { priv->cpu_interface |= CPUIF_DSC; clktmp /= 2; } /* The memory clock may not exceed 8 MHz */ if (clktmp > 8000000) priv->cpu_interface |= CPUIF_DMC; } if (priv->cpu_interface & CPUIF_DSC) priv->can.clock.freq /= 2; if (bcr[idx] != 0xff) priv->bus_config = bcr[idx]; else if (bcr[0] != 0xff) priv->bus_config = bcr[0]; else priv->bus_config = BCR_DEFAULT; if (cor[idx] != 0xff) priv->clkout = cor[idx]; else if (cor[0] != 0xff) priv->clkout = cor[0]; else priv->clkout = COR_DEFAULT; dev_set_drvdata(&pdev->dev, dev); SET_NETDEV_DEV(dev, &pdev->dev); err = register_cc770dev(dev); if (err) { dev_err(&pdev->dev, "couldn't register device (err=%d)\n", err); goto exit_unmap; } dev_info(&pdev->dev, "device registered (reg_base=0x%p, irq=%d)\n", 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 cc770_isa_remove(struct platform_device *pdev) { struct net_device *dev = dev_get_drvdata(&pdev->dev); struct cc770_priv *priv = netdev_priv(dev); int idx = pdev->id; unregister_cc770dev(dev); dev_set_drvdata(&pdev->dev, NULL); if (mem[idx]) { iounmap(priv->reg_base); release_mem_region(mem[idx], CC770_IOSIZE); } else { if (priv->read_reg == cc770_isa_port_read_reg_indirect) release_region(port[idx], CC770_IOSIZE_INDIRECT); else release_region(port[idx], CC770_IOSIZE); } free_cc770dev(dev); return 0; } static struct platform_driver cc770_isa_driver = { .probe = cc770_isa_probe, .remove = __devexit_p(cc770_isa_remove), .driver = { .name = KBUILD_MODNAME, .owner = THIS_MODULE, }, }; static int __init cc770_isa_init(void) { int idx, err; for (idx = 0; idx < ARRAY_SIZE(cc770_isa_devs); idx++) { if ((port[idx] || mem[idx]) && irq[idx]) { cc770_isa_devs[idx] = platform_device_alloc(KBUILD_MODNAME, idx); if (!cc770_isa_devs[idx]) { err = -ENOMEM; goto exit_free_devices; } err = platform_device_add(cc770_isa_devs[idx]); if (err) { platform_device_put(cc770_isa_devs[idx]); goto exit_free_devices; } pr_debug("platform device %d: port=%#lx, mem=%#lx, " "irq=%d\n", idx, port[idx], mem[idx], irq[idx]); } else if (idx == 0 || port[idx] || mem[idx]) { pr_err("insufficient parameters supplied\n"); err = -EINVAL; goto exit_free_devices; } } err = platform_driver_register(&cc770_isa_driver); if (err) goto exit_free_devices; pr_info("driver for max. %d devices registered\n", MAXDEV); return 0; exit_free_devices: while (--idx >= 0) { if (cc770_isa_devs[idx]) platform_device_unregister(cc770_isa_devs[idx]); } return err; } module_init(cc770_isa_init); static void __exit cc770_isa_exit(void) { int idx; platform_driver_unregister(&cc770_isa_driver); for (idx = 0; idx < ARRAY_SIZE(cc770_isa_devs); idx++) { if (cc770_isa_devs[idx]) platform_device_unregister(cc770_isa_devs[idx]); } } module_exit(cc770_isa_exit);