374 lines
9.2 KiB
C
374 lines
9.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for CC770 and AN82527 CAN controllers on the legacy ISA bus
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*
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* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
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*/
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/*
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* Bosch CC770 and Intel AN82527 CAN controllers on the ISA or PC-104 bus.
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* The I/O port or memory address and the IRQ number must be specified via
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* module parameters:
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*
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* insmod cc770_isa.ko port=0x310,0x380 irq=7,11
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*
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* for ISA devices using I/O ports or:
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*
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* insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11
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*
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* for memory mapped ISA devices.
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*
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* Indirect access via address and data port is supported as well:
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*
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* insmod cc770_isa.ko port=0x310,0x380 indirect=1 irq=7,11
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*
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* Furthermore, the following mode parameter can be defined:
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*
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* clk: External oscillator clock frequency (default=16000000 [16 MHz])
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* cir: CPU interface register (default=0x40 [DSC])
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* bcr: Bus configuration register (default=0x40 [CBY])
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* cor: Clockout register (default=0x00)
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*
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* Note: for clk, cir, bcr and cor, the first argument re-defines the
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* default for all other devices, e.g.:
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*
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* insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11 clk=24000000
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*
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* is equivalent to
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*
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* insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11 clk=24000000,24000000
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.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/cc770.h>
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#include "cc770.h"
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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 CC770 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 COR_DEFAULT 0x00
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#define BCR_DEFAULT BUSCFG_CBY
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static unsigned long port[MAXDEV];
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static unsigned long mem[MAXDEV];
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static int irq[MAXDEV];
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static int clk[MAXDEV];
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static u8 cir[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
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static u8 cor[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
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static u8 bcr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
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static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
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module_param_hw_array(port, ulong, ioport, NULL, 0444);
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MODULE_PARM_DESC(port, "I/O port number");
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module_param_hw_array(mem, ulong, iomem, NULL, 0444);
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MODULE_PARM_DESC(mem, "I/O memory address");
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module_param_hw_array(indirect, int, ioport, NULL, 0444);
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MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
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module_param_hw_array(irq, int, irq, NULL, 0444);
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MODULE_PARM_DESC(irq, "IRQ number");
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module_param_array(clk, int, NULL, 0444);
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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(cir, byte, NULL, 0444);
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MODULE_PARM_DESC(cir, "CPU interface register (default=0x40 [DSC])");
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module_param_array(cor, byte, NULL, 0444);
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MODULE_PARM_DESC(cor, "Clockout register (default=0x00)");
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module_param_array(bcr, byte, NULL, 0444);
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MODULE_PARM_DESC(bcr, "Bus configuration register (default=0x40 [CBY])");
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#define CC770_IOSIZE 0x20
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#define CC770_IOSIZE_INDIRECT 0x02
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/* Spinlock for cc770_isa_port_write_reg_indirect
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* and cc770_isa_port_read_reg_indirect
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*/
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static DEFINE_SPINLOCK(cc770_isa_port_lock);
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static struct platform_device *cc770_isa_devs[MAXDEV];
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static u8 cc770_isa_mem_read_reg(const struct cc770_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 cc770_isa_mem_write_reg(const struct cc770_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 cc770_isa_port_read_reg(const struct cc770_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 cc770_isa_port_write_reg(const struct cc770_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 cc770_isa_port_read_reg_indirect(const struct cc770_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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unsigned long flags;
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u8 val;
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spin_lock_irqsave(&cc770_isa_port_lock, flags);
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outb(reg, base);
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val = inb(base + 1);
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spin_unlock_irqrestore(&cc770_isa_port_lock, flags);
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return val;
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}
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static void cc770_isa_port_write_reg_indirect(const struct cc770_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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unsigned long flags;
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spin_lock_irqsave(&cc770_isa_port_lock, flags);
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outb(reg, base);
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outb(val, base + 1);
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spin_unlock_irqrestore(&cc770_isa_port_lock, flags);
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}
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static int cc770_isa_probe(struct platform_device *pdev)
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{
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struct net_device *dev;
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struct cc770_priv *priv;
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void __iomem *base = NULL;
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int iosize = CC770_IOSIZE;
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int idx = pdev->id;
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int err;
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u32 clktmp;
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dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
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idx, port[idx], mem[idx], irq[idx]);
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if (mem[idx]) {
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if (!request_mem_region(mem[idx], iosize, KBUILD_MODNAME)) {
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err = -EBUSY;
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goto exit;
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}
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base = ioremap(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 = CC770_IOSIZE_INDIRECT;
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if (!request_region(port[idx], iosize, KBUILD_MODNAME)) {
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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_cc770dev(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 = cc770_isa_mem_read_reg;
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priv->write_reg = cc770_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 == CC770_IOSIZE_INDIRECT) {
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priv->read_reg = cc770_isa_port_read_reg_indirect;
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priv->write_reg = cc770_isa_port_write_reg_indirect;
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} else {
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priv->read_reg = cc770_isa_port_read_reg;
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priv->write_reg = cc770_isa_port_write_reg;
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}
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}
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if (clk[idx])
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clktmp = clk[idx];
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else if (clk[0])
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clktmp = clk[0];
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else
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clktmp = CLK_DEFAULT;
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priv->can.clock.freq = clktmp;
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if (cir[idx] != 0xff) {
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priv->cpu_interface = cir[idx];
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} else if (cir[0] != 0xff) {
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priv->cpu_interface = cir[0];
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} else {
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/* The system clock may not exceed 10 MHz */
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if (clktmp > 10000000) {
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priv->cpu_interface |= CPUIF_DSC;
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clktmp /= 2;
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}
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/* The memory clock may not exceed 8 MHz */
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if (clktmp > 8000000)
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priv->cpu_interface |= CPUIF_DMC;
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}
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if (priv->cpu_interface & CPUIF_DSC)
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priv->can.clock.freq /= 2;
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if (bcr[idx] != 0xff)
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priv->bus_config = bcr[idx];
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else if (bcr[0] != 0xff)
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priv->bus_config = bcr[0];
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else
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priv->bus_config = BCR_DEFAULT;
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if (cor[idx] != 0xff)
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priv->clkout = cor[idx];
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else if (cor[0] != 0xff)
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priv->clkout = cor[0];
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else
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priv->clkout = COR_DEFAULT;
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platform_set_drvdata(pdev, dev);
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SET_NETDEV_DEV(dev, &pdev->dev);
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err = register_cc770dev(dev);
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if (err) {
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dev_err(&pdev->dev,
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"couldn't register device (err=%d)\n", err);
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goto exit_free;
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}
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dev_info(&pdev->dev, "device registered (reg_base=0x%p, irq=%d)\n",
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priv->reg_base, dev->irq);
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return 0;
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exit_free:
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free_cc770dev(dev);
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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 cc770_isa_remove(struct platform_device *pdev)
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{
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struct net_device *dev = platform_get_drvdata(pdev);
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struct cc770_priv *priv = netdev_priv(dev);
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int idx = pdev->id;
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unregister_cc770dev(dev);
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if (mem[idx]) {
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iounmap(priv->reg_base);
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release_mem_region(mem[idx], CC770_IOSIZE);
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} else {
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if (priv->read_reg == cc770_isa_port_read_reg_indirect)
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release_region(port[idx], CC770_IOSIZE_INDIRECT);
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else
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release_region(port[idx], CC770_IOSIZE);
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}
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free_cc770dev(dev);
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return 0;
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}
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static struct platform_driver cc770_isa_driver = {
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.probe = cc770_isa_probe,
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.remove = cc770_isa_remove,
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.driver = {
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.name = KBUILD_MODNAME,
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},
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};
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static int __init cc770_isa_init(void)
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{
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int idx, err;
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for (idx = 0; idx < ARRAY_SIZE(cc770_isa_devs); idx++) {
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if ((port[idx] || mem[idx]) && irq[idx]) {
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cc770_isa_devs[idx] =
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platform_device_alloc(KBUILD_MODNAME, idx);
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if (!cc770_isa_devs[idx]) {
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err = -ENOMEM;
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goto exit_free_devices;
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}
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err = platform_device_add(cc770_isa_devs[idx]);
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if (err) {
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platform_device_put(cc770_isa_devs[idx]);
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goto exit_free_devices;
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}
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pr_debug("platform device %d: port=%#lx, mem=%#lx, "
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"irq=%d\n",
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idx, port[idx], mem[idx], irq[idx]);
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} else if (idx == 0 || port[idx] || mem[idx]) {
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pr_err("insufficient parameters supplied\n");
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err = -EINVAL;
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goto exit_free_devices;
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}
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}
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err = platform_driver_register(&cc770_isa_driver);
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if (err)
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goto exit_free_devices;
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pr_info("driver for max. %d devices registered\n", MAXDEV);
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return 0;
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exit_free_devices:
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while (--idx >= 0) {
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if (cc770_isa_devs[idx])
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platform_device_unregister(cc770_isa_devs[idx]);
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}
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return err;
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}
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module_init(cc770_isa_init);
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static void __exit cc770_isa_exit(void)
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{
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int idx;
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platform_driver_unregister(&cc770_isa_driver);
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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);
|