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Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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orangepi/linux-orangepi-5.10.y.git/trunk/drivers/net/can/cc770/cc770_isa.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for CC770 and AN82527 CAN controllers on the legacy ISA bus
 *
 * Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
 */
 
/*
 * 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(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_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 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);
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