/* orinoco_plx.c
*
* Driver for Prism II devices which would usually be driven by orinoco_cs,
* but are connected to the PCI bus by a PLX9052.
*
* Current maintainers are:
* Pavel Roskin <proski AT gnu.org>
* and David Gibson <hermes AT gibson.dropbear.id.au>
*
* (C) Copyright David Gibson, IBM Corp. 2001-2003.
* Copyright (C) 2001 Daniel Barlow
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License
* at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and
* limitations under the License.
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License version 2 (the "GPL"), in
* which case the provisions of the GPL are applicable instead of the
* above. If you wish to allow the use of your version of this file
* only under the terms of the GPL and not to allow others to use your
* version of this file under the MPL, indicate your decision by
* deleting the provisions above and replace them with the notice and
* other provisions required by the GPL. If you do not delete the
* provisions above, a recipient may use your version of this file
* under either the MPL or the GPL.
*
* Here's the general details on how the PLX9052 adapter works:
*
* - Two PCI I/O address spaces, one 0x80 long which contains the
* PLX9052 registers, and one that's 0x40 long mapped to the PCMCIA
* slot I/O address space.
*
* - One PCI memory address space, mapped to the PCMCIA attribute space
* (containing the CIS).
*
* Using the later, you can read through the CIS data to make sure the
* card is compatible with the driver. Keep in mind that the PCMCIA
* spec specifies the CIS as the lower 8 bits of each word read from
* the CIS, so to read the bytes of the CIS, read every other byte
* (0,2,4,...). Passing that test, you need to enable the I/O address
* space on the PCMCIA card via the PCMCIA COR register. This is the
* first byte following the CIS. In my case (which may not have any
* relation to what's on the PRISM2 cards), COR was at offset 0x800
* within the PCI memory space. Write 0x41 to the COR register to
* enable I/O mode and to select level triggered interrupts. To
* confirm you actually succeeded, read the COR register back and make
* sure it actually got set to 0x41, in case you have an unexpected
* card inserted.
*
* Following that, you can treat the second PCI I/O address space (the
* one that's not 0x80 in length) as the PCMCIA I/O space.
*
* Note that in the Eumitcom's source for their drivers, they register
* the interrupt as edge triggered when registering it with the
* Windows kernel. I don't recall how to register edge triggered on
* Linux (if it can be done at all). But in some experimentation, I
* don't see much operational difference between using either
* interrupt mode. Don't mess with the interrupt mode in the COR
* register though, as the PLX9052 wants level triggers with the way
* the serial EEPROM configures it on the WL11000.
*
* There's some other little quirks related to timing that I bumped
* into, but I don't recall right now. Also, there's two variants of
* the WL11000 I've seen, revision A1 and T2. These seem to differ
* slightly in the timings configured in the wait-state generator in
* the PLX9052. There have also been some comments from Eumitcom that
* cards shouldn't be hot swapped, apparently due to risk of cooking
* the PLX9052. I'm unsure why they believe this, as I can't see
* anything in the design that would really cause a problem, except
* for crashing drivers not written to expect it. And having developed
* drivers for the WL11000, I'd say it's quite tricky to write code
* that will successfully deal with a hot unplug. Very odd things
* happen on the I/O side of things. But anyway, be warned. Despite
* that, I've hot-swapped a number of times during debugging and
* driver development for various reasons (stuck WAIT# line after the
* radio card's firmware locks up).
*/
#define DRIVER_NAME "orinoco_plx"
#define PFX DRIVER_NAME ": "
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <pcmcia/cisreg.h>
#include "orinoco.h"
#include "orinoco_pci.h"
#define COR_OFFSET (0x3e0) /* COR attribute offset of Prism2 PC card */
#define COR_VALUE (COR_LEVEL_REQ | COR_FUNC_ENA) /* Enable PC card with interrupt in level trigger */
#define COR_RESET (0x80) /* reset bit in the COR register */
#define PLX_RESET_TIME (500) /* milliseconds */
#define PLX_INTCSR 0x4c /* Interrupt Control & Status Register */
#define PLX_INTCSR_INTEN (1<<6) /* Interrupt Enable bit */
/*
* Do a soft reset of the card using the Configuration Option Register
*/
static int orinoco_plx_cor_reset(struct orinoco_private *priv)
{
hermes_t *hw = &priv->hw;
struct orinoco_pci_card *card = priv->card;
unsigned long timeout;
u16 reg;
iowrite8(COR_VALUE | COR_RESET, card->attr_io + COR_OFFSET);
mdelay(1);
iowrite8(COR_VALUE, card->attr_io + COR_OFFSET);
mdelay(1);
/* Just in case, wait more until the card is no longer busy */
timeout = jiffies + (PLX_RESET_TIME * HZ / 1000);
reg = hermes_read_regn(hw, CMD);
while (time_before(jiffies, timeout) && (reg & HERMES_CMD_BUSY)) {
mdelay(1);
reg = hermes_read_regn(hw, CMD);
}
/* Still busy? */
if (reg & HERMES_CMD_BUSY) {
printk(KERN_ERR PFX "Busy timeout\n");
return -ETIMEDOUT;
}
return 0;
}
static int orinoco_plx_hw_init(struct orinoco_pci_card *card)
{
int i;
u32 csr_reg;
static const u8 cis_magic[] = {
0x01, 0x03, 0x00, 0x00, 0xff, 0x17, 0x04, 0x67
};
printk(KERN_DEBUG PFX "CIS: ");
for (i = 0; i < 16; i++) {
printk("%02X:", ioread8(card->attr_io + (i << 1)));
}
printk("\n");
/* Verify whether a supported PC card is present */
/* FIXME: we probably need to be smarted about this */
for (i = 0; i < sizeof(cis_magic); i++) {
if (cis_magic[i] != ioread8(card->attr_io + (i << 1))) {
printk(KERN_ERR PFX "The CIS value of Prism2 PC "
"card is unexpected\n");
return -ENODEV;
}
}
/* bjoern: We need to tell the card to enable interrupts, in
case the serial eprom didn't do this already. See the
PLX9052 data book, p8-1 and 8-24 for reference. */
csr_reg = ioread32(card->bridge_io + PLX_INTCSR);
if (!(csr_reg & PLX_INTCSR_INTEN)) {
csr_reg |= PLX_INTCSR_INTEN;
iowrite32(csr_reg, card->bridge_io + PLX_INTCSR);
csr_reg = ioread32(card->bridge_io + PLX_INTCSR);
if (!(csr_reg & PLX_INTCSR_INTEN)) {
printk(KERN_ERR PFX "Cannot enable interrupts\n");
return -EIO;
}
}
return 0;
}
static int orinoco_plx_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int err;
struct orinoco_private *priv;
struct orinoco_pci_card *card;
struct net_device *dev;
void __iomem *hermes_io, *attr_io, *bridge_io;
err = pci_enable_device(pdev);
if (err) {
printk(KERN_ERR PFX "Cannot enable PCI device\n");
return err;
}
err = pci_request_regions(pdev, DRIVER_NAME);
if (err) {
printk(KERN_ERR PFX "Cannot obtain PCI resources\n");
goto fail_resources;
}
bridge_io = pci_iomap(pdev, 1, 0);
if (!bridge_io) {
printk(KERN_ERR PFX "Cannot map bridge registers\n");
err = -EIO;
goto fail_map_bridge;
}
attr_io = pci_iomap(pdev, 2, 0);
if (!attr_io) {
printk(KERN_ERR PFX "Cannot map PCMCIA attributes\n");
err = -EIO;
goto fail_map_attr;
}
hermes_io = pci_iomap(pdev, 3, 0);
if (!hermes_io) {
printk(KERN_ERR PFX "Cannot map chipset registers\n");
err = -EIO;
goto fail_map_hermes;
}
/* Allocate network device */
dev = alloc_orinocodev(sizeof(*card), &pdev->dev,
orinoco_plx_cor_reset, NULL);
if (!dev) {
printk(KERN_ERR PFX "Cannot allocate network device\n");
err = -ENOMEM;
goto fail_alloc;
}
priv = netdev_priv(dev);
card = priv->card;
card->bridge_io = bridge_io;
card->attr_io = attr_io;
SET_NETDEV_DEV(dev, &pdev->dev);
hermes_struct_init(&priv->hw, hermes_io, HERMES_16BIT_REGSPACING);
err = request_irq(pdev->irq, orinoco_interrupt, IRQF_SHARED,
dev->name, dev);
if (err) {
printk(KERN_ERR PFX "Cannot allocate IRQ %d\n", pdev->irq);
err = -EBUSY;
goto fail_irq;
}
err = orinoco_plx_hw_init(card);
if (err) {
printk(KERN_ERR PFX "Hardware initialization failed\n");
goto fail;
}
err = orinoco_plx_cor_reset(priv);
if (err) {
printk(KERN_ERR PFX "Initial reset failed\n");
goto fail;
}
err = register_netdev(dev);
if (err) {
printk(KERN_ERR PFX "Cannot register network device\n");
goto fail;
}
pci_set_drvdata(pdev, dev);
printk(KERN_DEBUG "%s: " DRIVER_NAME " at %s\n", dev->name,
pci_name(pdev));
return 0;
fail:
free_irq(pdev->irq, dev);
fail_irq:
pci_set_drvdata(pdev, NULL);
free_orinocodev(dev);
fail_alloc:
pci_iounmap(pdev, hermes_io);
fail_map_hermes:
pci_iounmap(pdev, attr_io);
fail_map_attr:
pci_iounmap(pdev, bridge_io);
fail_map_bridge:
pci_release_regions(pdev);
fail_resources:
pci_disable_device(pdev);
return err;
}
static void __devexit orinoco_plx_remove_one(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct orinoco_private *priv = netdev_priv(dev);
struct orinoco_pci_card *card = priv->card;
unregister_netdev(dev);
free_irq(pdev->irq, dev);
pci_set_drvdata(pdev, NULL);
free_orinocodev(dev);
pci_iounmap(pdev, priv->hw.iobase);
pci_iounmap(pdev, card->attr_io);
pci_iounmap(pdev, card->bridge_io);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
static struct pci_device_id orinoco_plx_id_table[] = {
{0x111a, 0x1023, PCI_ANY_ID, PCI_ANY_ID,}, /* Siemens SpeedStream SS1023 */
{0x1385, 0x4100, PCI_ANY_ID, PCI_ANY_ID,}, /* Netgear MA301 */
{0x15e8, 0x0130, PCI_ANY_ID, PCI_ANY_ID,}, /* Correga - does this work? */
{0x1638, 0x1100, PCI_ANY_ID, PCI_ANY_ID,}, /* SMC EZConnect SMC2602W,
Eumitcom PCI WL11000,
Addtron AWA-100 */
{0x16ab, 0x1100, PCI_ANY_ID, PCI_ANY_ID,}, /* Global Sun Tech GL24110P */
{0x16ab, 0x1101, PCI_ANY_ID, PCI_ANY_ID,}, /* Reported working, but unknown */
{0x16ab, 0x1102, PCI_ANY_ID, PCI_ANY_ID,}, /* Linksys WDT11 */
{0x16ec, 0x3685, PCI_ANY_ID, PCI_ANY_ID,}, /* USR 2415 */
{0xec80, 0xec00, PCI_ANY_ID, PCI_ANY_ID,}, /* Belkin F5D6000 tested by
Brendan W. McAdams <rit AT jacked-in.org> */
{0x10b7, 0x7770, PCI_ANY_ID, PCI_ANY_ID,}, /* 3Com AirConnect PCI tested by
Damien Persohn <damien AT persohn.net> */
{0,},
};
MODULE_DEVICE_TABLE(pci, orinoco_plx_id_table);
static struct pci_driver orinoco_plx_driver = {
.name = DRIVER_NAME,
.id_table = orinoco_plx_id_table,
.probe = orinoco_plx_init_one,
.remove = __devexit_p(orinoco_plx_remove_one),
.suspend = orinoco_pci_suspend,
.resume = orinoco_pci_resume,
};
static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
" (Pavel Roskin <proski@gnu.org>,"
" David Gibson <hermes@gibson.dropbear.id.au>,"
" Daniel Barlow <dan@telent.net>)";
MODULE_AUTHOR("Daniel Barlow <dan@telent.net>");
MODULE_DESCRIPTION("Driver for wireless LAN cards using the PLX9052 PCI bridge");
MODULE_LICENSE("Dual MPL/GPL");
static int __init orinoco_plx_init(void)
{
printk(KERN_DEBUG "%s\n", version);
return pci_register_driver(&orinoco_plx_driver);
}
static void __exit orinoco_plx_exit(void)
{
pci_unregister_driver(&orinoco_plx_driver);
}
module_init(orinoco_plx_init);
module_exit(orinoco_plx_exit);
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* tab-width: 8
* End:
*/
