mirror of
https://github.com/torvalds/linux.git
synced 2024-12-09 04:31:39 +00:00
can: cc770: legacy CC770 ISA bus driver
This patch adds support for legacy 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 [CPU_DSC]) ocr, Bus configuration register (default=0x00) 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 Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
b440752d5d
commit
7e02e5433e
@ -1,3 +1,14 @@
|
||||
menuconfig CAN_CC770
|
||||
tristate "Bosch CC770 and Intel AN82527 devices"
|
||||
depends on CAN_DEV && HAS_IOMEM
|
||||
|
||||
if CAN_CC770
|
||||
|
||||
config CAN_CC770_ISA
|
||||
tristate "ISA Bus based legacy CC770 driver"
|
||||
---help---
|
||||
This driver adds legacy support for CC770 and AN82527 chips
|
||||
connected to the ISA bus using I/O port, memory mapped or
|
||||
indirect access.
|
||||
|
||||
endif
|
||||
|
@ -3,5 +3,6 @@
|
||||
#
|
||||
|
||||
obj-$(CONFIG_CAN_CC770) += cc770.o
|
||||
obj-$(CONFIG_CAN_CC770_ISA) += cc770_isa.o
|
||||
|
||||
ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
|
||||
|
337
drivers/net/can/cc770/cc770_isa.c
Normal file
337
drivers/net/can/cc770/cc770_isa.c
Normal file
@ -0,0 +1,337 @@
|
||||
/*
|
||||
* 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.
|
||||
*
|
||||
* 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/version.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 "cc770.h"
|
||||
|
||||
#define DRV_NAME "cc770_isa"
|
||||
|
||||
#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 BCR_DEFAULT 0x00
|
||||
#define COR_DEFAULT 0x00
|
||||
|
||||
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 bcr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
|
||||
static u8 __devinitdata cor[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 [CPU_DSC])");
|
||||
|
||||
module_param_array(bcr, byte, NULL, S_IRUGO);
|
||||
MODULE_PARM_DESC(ocr, "Bus configuration register (default=0x00)");
|
||||
|
||||
module_param_array(cor, byte, NULL, S_IRUGO);
|
||||
MODULE_PARM_DESC(cor, "Clockout register (default=0x00)");
|
||||
|
||||
#define CC770_IOSIZE 0x20
|
||||
#define CC770_IOSIZE_INDIRECT 0x02
|
||||
|
||||
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;
|
||||
|
||||
outb(reg, base);
|
||||
return inb(base + 1);
|
||||
}
|
||||
|
||||
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;
|
||||
|
||||
outb(reg, base);
|
||||
outb(val, base + 1);
|
||||
}
|
||||
|
||||
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, 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 = CC770_IOSIZE_INDIRECT;
|
||||
if (!request_region(port[idx], iosize, DRV_NAME)) {
|
||||
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] & 0xff;
|
||||
} else if (cir[0] != 0xff) {
|
||||
priv->cpu_interface = cir[0] & 0xff;
|
||||
} 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] & 0xff;
|
||||
else if (bcr[0] != 0xff)
|
||||
priv->bus_config = bcr[0] & 0xff;
|
||||
else
|
||||
priv->bus_config = BCR_DEFAULT;
|
||||
|
||||
if (cor[idx] != 0xff)
|
||||
priv->clkout = cor[idx];
|
||||
else if (cor[0] != 0xff)
|
||||
priv->clkout = cor[0] & 0xff;
|
||||
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, "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 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 = DRV_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init cc770_isa_init(void)
|
||||
{
|
||||
int idx, err;
|
||||
|
||||
for (idx = 0; idx < MAXDEV; idx++) {
|
||||
if ((port[idx] || mem[idx]) && irq[idx]) {
|
||||
cc770_isa_devs[idx] =
|
||||
platform_device_alloc(DRV_NAME, 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("%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(&cc770_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 (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 < MAXDEV; idx++) {
|
||||
if (cc770_isa_devs[idx])
|
||||
platform_device_unregister(cc770_isa_devs[idx]);
|
||||
}
|
||||
}
|
||||
module_exit(cc770_isa_exit);
|
Loading…
Reference in New Issue
Block a user