| /* |
| * 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 irq[MAXDEV]; |
| static int clk[MAXDEV]; |
| static u8 cir[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; |
| static u8 cor[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; |
| static u8 bcr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; |
| static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1}; |
| |
| module_param_hw_array(port, ulong, ioport, NULL, 0444); |
| MODULE_PARM_DESC(port, "I/O port number"); |
| |
| module_param_hw_array(mem, ulong, iomem, NULL, 0444); |
| MODULE_PARM_DESC(mem, "I/O memory address"); |
| |
| module_param_hw_array(indirect, int, ioport, NULL, 0444); |
| MODULE_PARM_DESC(indirect, "Indirect access via address and data port"); |
| |
| module_param_hw_array(irq, int, irq, NULL, 0444); |
| MODULE_PARM_DESC(irq, "IRQ number"); |
| |
| module_param_array(clk, int, NULL, 0444); |
| MODULE_PARM_DESC(clk, "External oscillator clock frequency " |
| "(default=16000000 [16 MHz])"); |
| |
| module_param_array(cir, byte, NULL, 0444); |
| MODULE_PARM_DESC(cir, "CPU interface register (default=0x40 [DSC])"); |
| |
| module_param_array(cor, byte, NULL, 0444); |
| MODULE_PARM_DESC(cor, "Clockout register (default=0x00)"); |
| |
| module_param_array(bcr, byte, NULL, 0444); |
| 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 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; |
| |
| platform_set_drvdata(pdev, 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_free; |
| } |
| |
| dev_info(&pdev->dev, "device registered (reg_base=0x%p, irq=%d)\n", |
| priv->reg_base, dev->irq); |
| return 0; |
| |
| exit_free: |
| free_cc770dev(dev); |
| 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 cc770_isa_remove(struct platform_device *pdev) |
| { |
| struct net_device *dev = platform_get_drvdata(pdev); |
| struct cc770_priv *priv = netdev_priv(dev); |
| int idx = pdev->id; |
| |
| unregister_cc770dev(dev); |
| |
| 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 = cc770_isa_remove, |
| .driver = { |
| .name = KBUILD_MODNAME, |
| }, |
| }; |
| |
| 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); |