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linux/drivers/net/wireless/orinoco_pci.c

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/* orinoco_pci.c
*
* Driver for Prism II devices that have a direct PCI interface
* (i.e., not in a Pcmcia or PLX bridge)
*
* Specifically here we're talking about the Linksys WMP11
*
* Current maintainers (as of 29 September 2003) are:
* Pavel Roskin <proski AT gnu.org>
* and David Gibson <hermes AT gibson.dropbear.id.au>
*
* Some of this code is borrowed from orinoco_plx.c
* Copyright (C) 2001 Daniel Barlow <dan AT telent.net>
* Some of this code is "inspired" by linux-wlan-ng-0.1.10, but nothing
* has been copied from it. linux-wlan-ng-0.1.10 is originally :
* Copyright (C) 1999 AbsoluteValue Systems, Inc. All Rights Reserved.
* This file originally written by:
* Copyright (C) 2001 Jean Tourrilhes <jt AT hpl.hp.com>
* And is now maintained by:
* (C) Copyright David Gibson, IBM Corp. 2002-2003.
*
* 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.
*/
/*
* Theory of operation...
* -------------------
* Maybe you had a look in orinoco_plx. Well, this is totally different...
*
* The card contains only one PCI region, which contains all the usual
* hermes registers.
*
* The driver will memory map this region in normal memory. Because
* the hermes registers are mapped in normal memory and not in ISA I/O
* post space, we can't use the usual inw/outw macros and we need to
* use readw/writew.
* This slight difference force us to compile our own version of
* hermes.c with the register access macro changed. That's a bit
* hackish but works fine.
*
* Note that the PCI region is pretty big (4K). That's much more than
* the usual set of hermes register (0x0 -> 0x3E). I've got a strong
* suspicion that the whole memory space of the adapter is in fact in
* this region. Accessing directly the adapter memory instead of going
* through the usual register would speed up significantely the
* operations...
*
* Finally, the card looks like this :
-----------------------
Bus 0, device 14, function 0:
Network controller: PCI device 1260:3873 (Harris Semiconductor) (rev 1).
IRQ 11.
Master Capable. Latency=248.
Prefetchable 32 bit memory at 0xffbcc000 [0xffbccfff].
-----------------------
00:0e.0 Network controller: Harris Semiconductor: Unknown device 3873 (rev 01)
Subsystem: Unknown device 1737:3874
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 248 set, cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at ffbcc000 (32-bit, prefetchable) [size=4K]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- AuxPwr- DSI- D1+ D2+ PME+
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
-----------------------
*
* That's all..
*
* Jean II
*/
#define DRIVER_NAME "orinoco_pci"
#define PFX DRIVER_NAME ": "
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include "orinoco.h"
/* All the magic there is from wlan-ng */
/* Magic offset of the reset register of the PCI card */
#define HERMES_PCI_COR (0x26)
/* Magic bitmask to reset the card */
#define HERMES_PCI_COR_MASK (0x0080)
/* Magic timeouts for doing the reset.
* Those times are straight from wlan-ng, and it is claimed that they
* are necessary. Alan will kill me. Take your time and grab a coffee. */
#define HERMES_PCI_COR_ONT (250) /* ms */
#define HERMES_PCI_COR_OFFT (500) /* ms */
#define HERMES_PCI_COR_BUSYT (500) /* ms */
/* Orinoco PCI specific data */
struct orinoco_pci_card {
void __iomem *pci_ioaddr;
};
/*
* Do a soft reset of the PCI card using the Configuration Option Register
* We need this to get going...
* This is the part of the code that is strongly inspired from wlan-ng
*
* Note : This code is done with irq enabled. This mean that many
* interrupts will occur while we are there. This is why we use the
* jiffies to regulate time instead of a straight mdelay(). Usually we
* need only around 245 iteration of the loop to do 250 ms delay.
*
* Note bis : Don't try to access HERMES_CMD during the reset phase.
* It just won't work !
*/
static int
orinoco_pci_cor_reset(struct orinoco_private *priv)
{
hermes_t *hw = &priv->hw;
unsigned long timeout;
u16 reg;
/* Assert the reset until the card notice */
hermes_write_regn(hw, PCI_COR, HERMES_PCI_COR_MASK);
mdelay(HERMES_PCI_COR_ONT);
/* Give time for the card to recover from this hard effort */
hermes_write_regn(hw, PCI_COR, 0x0000);
mdelay(HERMES_PCI_COR_OFFT);
/* The card is ready when it's no longer busy */
timeout = jiffies + (HERMES_PCI_COR_BUSYT * 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;
}
/*
* Initialise a card. Mostly similar to PLX code.
*/
static int orinoco_pci_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int err = 0;
unsigned long pci_iorange;
u16 __iomem *pci_ioaddr = NULL;
unsigned long pci_iolen;
struct orinoco_private *priv = NULL;
struct orinoco_pci_card *card;
struct net_device *dev = NULL;
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 != 0) {
printk(KERN_ERR PFX "Cannot obtain PCI resources\n");
goto fail_resources;
}
/* Resource 0 is mapped to the hermes registers */
pci_iorange = pci_resource_start(pdev, 0);
pci_iolen = pci_resource_len(pdev, 0);
pci_ioaddr = ioremap(pci_iorange, pci_iolen);
if (!pci_iorange) {
printk(KERN_ERR PFX "Cannot remap hardware registers\n");
goto fail_map;
}
/* Allocate network device */
dev = alloc_orinocodev(sizeof(*card), orinoco_pci_cor_reset);
if (! dev) {
err = -ENOMEM;
goto fail_alloc;
}
priv = netdev_priv(dev);
card = priv->card;
card->pci_ioaddr = pci_ioaddr;
dev->mem_start = pci_iorange;
dev->mem_end = pci_iorange + pci_iolen - 1;
SET_MODULE_OWNER(dev);
SET_NETDEV_DEV(dev, &pdev->dev);
hermes_struct_init(&priv->hw, pci_ioaddr, HERMES_32BIT_REGSPACING);
printk(KERN_DEBUG PFX "Detected device %s, mem:0x%lx-0x%lx, irq %d\n",
pci_name(pdev), dev->mem_start, dev->mem_end, pdev->irq);
err = request_irq(pdev->irq, orinoco_interrupt, SA_SHIRQ,
dev->name, dev);
if (err) {
printk(KERN_ERR PFX "Cannot allocate IRQ %d\n", pdev->irq);
err = -EBUSY;
goto fail_irq;
}
dev->irq = pdev->irq;
/* Perform a COR reset to start the card */
err = orinoco_pci_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 "Failed to register net device\n");
goto fail;
}
pci_set_drvdata(pdev, dev);
return 0;
fail:
free_irq(pdev->irq, dev);
fail_irq:
pci_set_drvdata(pdev, NULL);
free_orinocodev(dev);
fail_alloc:
iounmap(pci_ioaddr);
fail_map:
pci_release_regions(pdev);
fail_resources:
pci_disable_device(pdev);
return err;
}
static void __devexit orinoco_pci_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(dev->irq, dev);
pci_set_drvdata(pdev, NULL);
free_orinocodev(dev);
iounmap(card->pci_ioaddr);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
static int orinoco_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct orinoco_private *priv = netdev_priv(dev);
unsigned long flags;
int err;
err = orinoco_lock(priv, &flags);
if (err) {
printk(KERN_ERR "%s: hw_unavailable on orinoco_pci_suspend\n",
dev->name);
return err;
}
err = __orinoco_down(dev);
if (err)
printk(KERN_WARNING "%s: orinoco_pci_suspend(): Error %d downing interface\n",
dev->name, err);
netif_device_detach(dev);
priv->hw_unavailable++;
orinoco_unlock(priv, &flags);
pci_save_state(pdev);
pci_set_power_state(pdev, PCI_D3hot);
return 0;
}
static int orinoco_pci_resume(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct orinoco_private *priv = netdev_priv(dev);
unsigned long flags;
int err;
printk(KERN_DEBUG "%s: Orinoco-PCI waking up\n", dev->name);
pci_set_power_state(pdev, 0);
pci_restore_state(pdev);
err = orinoco_reinit_firmware(dev);
if (err) {
printk(KERN_ERR "%s: Error %d re-initializing firmware on orinoco_pci_resume()\n",
dev->name, err);
return err;
}
spin_lock_irqsave(&priv->lock, flags);
netif_device_attach(dev);
priv->hw_unavailable--;
if (priv->open && (! priv->hw_unavailable)) {
err = __orinoco_up(dev);
if (err)
printk(KERN_ERR "%s: Error %d restarting card on orinoco_pci_resume()\n",
dev->name, err);
}
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static struct pci_device_id orinoco_pci_pci_id_table[] = {
/* Intersil Prism 3 */
{0x1260, 0x3872, PCI_ANY_ID, PCI_ANY_ID,},
/* Intersil Prism 2.5 */
{0x1260, 0x3873, PCI_ANY_ID, PCI_ANY_ID,},
/* Samsung MagicLAN SWL-2210P */
{0x167d, 0xa000, PCI_ANY_ID, PCI_ANY_ID,},
{0,},
};
MODULE_DEVICE_TABLE(pci, orinoco_pci_pci_id_table);
static struct pci_driver orinoco_pci_driver = {
.name = DRIVER_NAME,
.id_table = orinoco_pci_pci_id_table,
.probe = orinoco_pci_init_one,
.remove = __devexit_p(orinoco_pci_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> &"
" Jean Tourrilhes <jt@hpl.hp.com>)";
MODULE_AUTHOR("Pavel Roskin <proski@gnu.org> & David Gibson <hermes@gibson.dropbear.id.au>");
MODULE_DESCRIPTION("Driver for wireless LAN cards using direct PCI interface");
MODULE_LICENSE("Dual MPL/GPL");
static int __init orinoco_pci_init(void)
{
printk(KERN_DEBUG "%s\n", version);
return pci_module_init(&orinoco_pci_driver);
}
static void __exit orinoco_pci_exit(void)
{
pci_unregister_driver(&orinoco_pci_driver);
}
module_init(orinoco_pci_init);
module_exit(orinoco_pci_exit);
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* tab-width: 8
* End:
*/
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