orinoco_pci.c
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上传日期:2013-04-10
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- /* orinoco_pci.c 0.01
- *
- * 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
- *
- * Some of this code is borrowed from orinoco_plx.c
- * Copyright (C) 2001 Daniel Barlow <dan@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.
- * The rest is :
- * Copyright (C) 2001 Jean Tourrilhes <jt@hpl.hp.com>
- *
- * 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
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/sched.h>
- #include <linux/ptrace.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include <linux/timer.h>
- #include <linux/ioport.h>
- #include <asm/uaccess.h>
- #include <asm/io.h>
- #include <asm/system.h>
- #include <linux/proc_fs.h>
- #include <linux/netdevice.h>
- #include <linux/if_arp.h>
- #include <linux/etherdevice.h>
- #include <linux/wireless.h>
- #include <linux/list.h>
- #include <linux/pci.h>
- #include <linux/wireless.h>
- #include <linux/fcntl.h>
- #include "hermes.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 */
- MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
- MODULE_DESCRIPTION("Driver for wireless LAN cards using direct PCI interface");
- MODULE_LICENSE("Dual MPL/GPL");
- static int orinoco_pci_open(struct net_device *dev)
- {
- struct orinoco_private *priv = (struct orinoco_private *) dev->priv;
- int err;
- netif_device_attach(dev);
- err = orinoco_reset(priv);
- if (err)
- printk(KERN_ERR "%s: orinoco_reset failed in orinoco_pci_open()",
- dev->name);
- else
- netif_start_queue(dev);
- return err;
- }
- static int orinoco_pci_stop(struct net_device *dev)
- {
- struct orinoco_private *priv = (struct orinoco_private *) dev->priv;
- netif_stop_queue(dev);
- orinoco_shutdown(priv);
- return 0;
- }
- static void
- orinoco_pci_interrupt(int irq, void *dev_id, struct pt_regs *regs)
- {
- orinoco_interrupt(irq, (struct orinoco_private *)dev_id, regs);
- }
- /*
- * 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;
- TRACE_ENTER(priv->ndev->name);
- /* Assert the reset until the card notice */
- hermes_write_regn(hw, PCI_COR, HERMES_PCI_COR_MASK);
- printk(KERN_NOTICE "Reset done");
- timeout = jiffies + (HERMES_PCI_COR_ONT * HZ / 1000);
- while(time_before(jiffies, timeout)) {
- printk(".");
- mdelay(1);
- }
- printk(";n");
- //mdelay(HERMES_PCI_COR_ONT);
- /* Give time for the card to recover from this hard effort */
- hermes_write_regn(hw, PCI_COR, 0x0000);
- printk(KERN_NOTICE "Clear Reset");
- timeout = jiffies + (HERMES_PCI_COR_OFFT * HZ / 1000);
- while(time_before(jiffies, timeout)) {
- printk(".");
- mdelay(1);
- }
- printk(";n");
- //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);
- }
- /* Did we timeout ? */
- if(time_after_eq(jiffies, timeout)) {
- printk(KERN_ERR "orinoco_pci: Busy timeoutn");
- return -ETIMEDOUT;
- }
- printk(KERN_NOTICE "pci_cor : reg = 0x%X - %lX - %lXn", reg, timeout, jiffies);
- TRACE_EXIT(priv->ndev->name);
- 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 *pci_ioaddr = NULL;
- unsigned long pci_iolen;
- struct orinoco_private *priv = NULL;
- struct net_device *dev = NULL;
- int netdev_registered = 0;
- TRACE_ENTER("orinoco_pci");
- err = pci_enable_device(pdev);
- if (err)
- return -EIO;
- /* 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)
- goto fail;
- /* Usual setup of structures */
- dev = alloc_orinocodev(0);
- if (! dev) {
- err = -ENOMEM;
- goto fail;
- }
- priv = dev->priv;
- dev->base_addr = (int) pci_ioaddr;
- dev->mem_start = (unsigned long) pci_iorange;
- dev->mem_end = ((unsigned long) pci_iorange) + pci_iolen - 1;
- dev->open = orinoco_pci_open;
- dev->stop = orinoco_pci_stop;
- /* priv->card_reset_handler = orinoco_pci_cor_reset; */
- SET_MODULE_OWNER(dev);
- printk(KERN_DEBUG
- "Detected Orinoco/Prism2 PCI device at %s, mem:0x%lX to 0x%lX -> 0x%p, irq:%dn",
- pdev->slot_name, dev->mem_start, dev->mem_end, pci_ioaddr, pdev->irq);
- hermes_struct_init(&(priv->hw), dev->base_addr, HERMES_MEM, HERMES_32BIT_REGSPACING);
- pci_set_drvdata(pdev, dev);
- err = request_irq(pdev->irq, orinoco_pci_interrupt, SA_SHIRQ, dev->name, priv);
- if (err) {
- printk(KERN_ERR "orinoco_pci: Error allocating IRQ %d.n", pdev->irq);
- err = -EBUSY;
- goto fail;
- }
- dev->irq = pdev->irq;
- /* Perform a COR reset to start the card */
- if(orinoco_pci_cor_reset(priv) != 0) {
- printk(KERN_ERR "%s: Failed to start the cardn", dev->name);
- err = -ETIMEDOUT;
- goto fail;
- }
- /* Override the normal firmware detection - the Prism 2.5 PCI
- * cards look like Lucent firmware but are actually Intersil */
- priv->firmware_type = FIRMWARE_TYPE_INTERSIL;
- err = register_netdev(dev);
- if (err)
- goto fail;
- netdev_registered = 1;
- err = orinoco_proc_dev_init(priv);
- if (err) {
- printk(KERN_ERR "%s: Failed to create /proc noden", dev->name);
- err = -EIO;
- goto fail;
- }
- TRACE_EXIT("orinoco_pci");
- return 0; /* succeeded */
- fail:
- printk(KERN_DEBUG "orinoco_pci: init_one(), FAIL!n");
- if (dev) {
- orinoco_proc_dev_cleanup(priv);
- if (netdev_registered)
- unregister_netdev(dev);
- if (dev->irq)
- free_irq(dev->irq, priv);
- kfree(dev);
- }
- if (pci_ioaddr)
- iounmap(pci_ioaddr);
- 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 = dev->priv;
- TRACE_ENTER("orinoco_pci");
- if (! dev)
- BUG();
- orinoco_proc_dev_cleanup(priv);
- unregister_netdev(dev);
- if (dev->irq)
- free_irq(dev->irq, priv);
- if (priv->hw.iobase)
- iounmap((unsigned char *) priv->hw.iobase);
- kfree(dev);
- pci_disable_device(pdev);
- TRACE_EXIT("orinoco_pci");
- }
- static struct pci_device_id orinoco_pci_pci_id_table[] __devinitdata = {
- {0x1260, 0x3873, PCI_ANY_ID, PCI_ANY_ID,},
- {0,},
- };
- MODULE_DEVICE_TABLE(pci, orinoco_pci_pci_id_table);
- static struct pci_driver orinoco_pci_driver = {
- name:"orinoco_pci",
- id_table:orinoco_pci_pci_id_table,
- probe:orinoco_pci_init_one,
- remove:__devexit_p(orinoco_pci_remove_one),
- suspend:0,
- resume:0
- };
- static int __init orinoco_pci_init(void)
- {
- return pci_module_init(&orinoco_pci_driver);
- }
- extern 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:
- */