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linux/drivers/net/wireless/prism54/islpci_dev.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

950 lines
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/*
*
* Copyright (C) 2002 Intersil Americas Inc.
* Copyright (C) 2003 Herbert Valerio Riedel <hvr@gnu.org>
* Copyright (C) 2003 Luis R. Rodriguez <mcgrof@ruslug.rutgers.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License
*
* 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/module.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/if_arp.h>
#include <asm/io.h>
#include "prismcompat.h"
#include "isl_38xx.h"
#include "isl_ioctl.h"
#include "islpci_dev.h"
#include "islpci_mgt.h"
#include "islpci_eth.h"
#include "oid_mgt.h"
#define ISL3877_IMAGE_FILE "isl3877"
#define ISL3886_IMAGE_FILE "isl3886"
#define ISL3890_IMAGE_FILE "isl3890"
static int prism54_bring_down(islpci_private *);
static int islpci_alloc_memory(islpci_private *);
static struct net_device_stats *islpci_statistics(struct net_device *);
/* Temporary dummy MAC address to use until firmware is loaded.
* The idea there is that some tools (such as nameif) may query
* the MAC address before the netdev is 'open'. By using a valid
* OUI prefix, they can process the netdev properly.
* Of course, this is not the final/real MAC address. It doesn't
* matter, as you are suppose to be able to change it anytime via
* ndev->set_mac_address. Jean II */
static const unsigned char dummy_mac[6] = { 0x00, 0x30, 0xB4, 0x00, 0x00, 0x00 };
static int
isl_upload_firmware(islpci_private *priv)
{
u32 reg, rc;
void __iomem *device_base = priv->device_base;
/* clear the RAMBoot and the Reset bit */
reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
reg &= ~ISL38XX_CTRL_STAT_RESET;
reg &= ~ISL38XX_CTRL_STAT_RAMBOOT;
writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
wmb();
udelay(ISL38XX_WRITEIO_DELAY);
/* set the Reset bit without reading the register ! */
reg |= ISL38XX_CTRL_STAT_RESET;
writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
wmb();
udelay(ISL38XX_WRITEIO_DELAY);
/* clear the Reset bit */
reg &= ~ISL38XX_CTRL_STAT_RESET;
writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
wmb();
/* wait a while for the device to reboot */
mdelay(50);
{
const struct firmware *fw_entry = NULL;
long fw_len;
const u32 *fw_ptr;
rc = request_firmware(&fw_entry, priv->firmware, PRISM_FW_PDEV);
if (rc) {
printk(KERN_ERR
"%s: request_firmware() failed for '%s'\n",
"prism54", priv->firmware);
return rc;
}
/* prepare the Direct Memory Base register */
reg = ISL38XX_DEV_FIRMWARE_ADDRES;
fw_ptr = (u32 *) fw_entry->data;
fw_len = fw_entry->size;
if (fw_len % 4) {
printk(KERN_ERR
"%s: firmware '%s' size is not multiple of 32bit, aborting!\n",
"prism54", priv->firmware);
release_firmware(fw_entry);
return -EILSEQ; /* Illegal byte sequence */;
}
while (fw_len > 0) {
long _fw_len =
(fw_len >
ISL38XX_MEMORY_WINDOW_SIZE) ?
ISL38XX_MEMORY_WINDOW_SIZE : fw_len;
u32 __iomem *dev_fw_ptr = device_base + ISL38XX_DIRECT_MEM_WIN;
/* set the cards base address for writting the data */
isl38xx_w32_flush(device_base, reg,
ISL38XX_DIR_MEM_BASE_REG);
wmb(); /* be paranoid */
/* increment the write address for next iteration */
reg += _fw_len;
fw_len -= _fw_len;
/* write the data to the Direct Memory Window 32bit-wise */
/* memcpy_toio() doesn't guarantee 32bit writes :-| */
while (_fw_len > 0) {
/* use non-swapping writel() */
__raw_writel(*fw_ptr, dev_fw_ptr);
fw_ptr++, dev_fw_ptr++;
_fw_len -= 4;
}
/* flush PCI posting */
(void) readl(device_base + ISL38XX_PCI_POSTING_FLUSH);
wmb(); /* be paranoid again */
BUG_ON(_fw_len != 0);
}
BUG_ON(fw_len != 0);
/* Firmware version is at offset 40 (also for "newmac") */
printk(KERN_DEBUG "%s: firmware version: %.8s\n",
priv->ndev->name, fw_entry->data + 40);
release_firmware(fw_entry);
}
/* now reset the device
* clear the Reset & ClkRun bit, set the RAMBoot bit */
reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
reg &= ~ISL38XX_CTRL_STAT_CLKRUN;
reg &= ~ISL38XX_CTRL_STAT_RESET;
reg |= ISL38XX_CTRL_STAT_RAMBOOT;
isl38xx_w32_flush(device_base, reg, ISL38XX_CTRL_STAT_REG);
wmb();
udelay(ISL38XX_WRITEIO_DELAY);
/* set the reset bit latches the host override and RAMBoot bits
* into the device for operation when the reset bit is reset */
reg |= ISL38XX_CTRL_STAT_RESET;
writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
/* don't do flush PCI posting here! */
wmb();
udelay(ISL38XX_WRITEIO_DELAY);
/* clear the reset bit should start the whole circus */
reg &= ~ISL38XX_CTRL_STAT_RESET;
writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
/* don't do flush PCI posting here! */
wmb();
udelay(ISL38XX_WRITEIO_DELAY);
return 0;
}
/******************************************************************************
Device Interrupt Handler
******************************************************************************/
irqreturn_t
islpci_interrupt(int irq, void *config)
{
u32 reg;
islpci_private *priv = config;
struct net_device *ndev = priv->ndev;
void __iomem *device = priv->device_base;
int powerstate = ISL38XX_PSM_POWERSAVE_STATE;
/* lock the interrupt handler */
spin_lock(&priv->slock);
/* received an interrupt request on a shared IRQ line
* first check whether the device is in sleep mode */
reg = readl(device + ISL38XX_CTRL_STAT_REG);
if (reg & ISL38XX_CTRL_STAT_SLEEPMODE)
/* device is in sleep mode, IRQ was generated by someone else */
{
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_TRACING, "Assuming someone else called the IRQ\n");
#endif
spin_unlock(&priv->slock);
return IRQ_NONE;
}
/* check whether there is any source of interrupt on the device */
reg = readl(device + ISL38XX_INT_IDENT_REG);
/* also check the contents of the Interrupt Enable Register, because this
* will filter out interrupt sources from other devices on the same irq ! */
reg &= readl(device + ISL38XX_INT_EN_REG);
reg &= ISL38XX_INT_SOURCES;
if (reg != 0) {
if (islpci_get_state(priv) != PRV_STATE_SLEEP)
powerstate = ISL38XX_PSM_ACTIVE_STATE;
/* reset the request bits in the Identification register */
isl38xx_w32_flush(device, reg, ISL38XX_INT_ACK_REG);
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_FUNCTION_CALLS,
"IRQ: Identification register 0x%p 0x%x \n", device, reg);
#endif
/* check for each bit in the register separately */
if (reg & ISL38XX_INT_IDENT_UPDATE) {
#if VERBOSE > SHOW_ERROR_MESSAGES
/* Queue has been updated */
DEBUG(SHOW_TRACING, "IRQ: Update flag \n");
DEBUG(SHOW_QUEUE_INDEXES,
"CB drv Qs: [%i][%i][%i][%i][%i][%i]\n",
le32_to_cpu(priv->control_block->
driver_curr_frag[0]),
le32_to_cpu(priv->control_block->
driver_curr_frag[1]),
le32_to_cpu(priv->control_block->
driver_curr_frag[2]),
le32_to_cpu(priv->control_block->
driver_curr_frag[3]),
le32_to_cpu(priv->control_block->
driver_curr_frag[4]),
le32_to_cpu(priv->control_block->
driver_curr_frag[5])
);
DEBUG(SHOW_QUEUE_INDEXES,
"CB dev Qs: [%i][%i][%i][%i][%i][%i]\n",
le32_to_cpu(priv->control_block->
device_curr_frag[0]),
le32_to_cpu(priv->control_block->
device_curr_frag[1]),
le32_to_cpu(priv->control_block->
device_curr_frag[2]),
le32_to_cpu(priv->control_block->
device_curr_frag[3]),
le32_to_cpu(priv->control_block->
device_curr_frag[4]),
le32_to_cpu(priv->control_block->
device_curr_frag[5])
);
#endif
/* cleanup the data low transmit queue */
islpci_eth_cleanup_transmit(priv, priv->control_block);
/* device is in active state, update the
* powerstate flag if necessary */
powerstate = ISL38XX_PSM_ACTIVE_STATE;
/* check all three queues in priority order
* call the PIMFOR receive function until the
* queue is empty */
if (isl38xx_in_queue(priv->control_block,
ISL38XX_CB_RX_MGMTQ) != 0) {
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_TRACING,
"Received frame in Management Queue\n");
#endif
islpci_mgt_receive(ndev);
islpci_mgt_cleanup_transmit(ndev);
/* Refill slots in receive queue */
islpci_mgmt_rx_fill(ndev);
/* no need to trigger the device, next
islpci_mgt_transaction does it */
}
while (isl38xx_in_queue(priv->control_block,
ISL38XX_CB_RX_DATA_LQ) != 0) {
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_TRACING,
"Received frame in Data Low Queue \n");
#endif
islpci_eth_receive(priv);
}
/* check whether the data transmit queues were full */
if (priv->data_low_tx_full) {
/* check whether the transmit is not full anymore */
if (ISL38XX_CB_TX_QSIZE -
isl38xx_in_queue(priv->control_block,
ISL38XX_CB_TX_DATA_LQ) >=
ISL38XX_MIN_QTHRESHOLD) {
/* nope, the driver is ready for more network frames */
netif_wake_queue(priv->ndev);
/* reset the full flag */
priv->data_low_tx_full = 0;
}
}
}
if (reg & ISL38XX_INT_IDENT_INIT) {
/* Device has been initialized */
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_TRACING,
"IRQ: Init flag, device initialized \n");
#endif
wake_up(&priv->reset_done);
}
if (reg & ISL38XX_INT_IDENT_SLEEP) {
/* Device intends to move to powersave state */
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_TRACING, "IRQ: Sleep flag \n");
#endif
isl38xx_handle_sleep_request(priv->control_block,
&powerstate,
priv->device_base);
}
if (reg & ISL38XX_INT_IDENT_WAKEUP) {
/* Device has been woken up to active state */
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_TRACING, "IRQ: Wakeup flag \n");
#endif
isl38xx_handle_wakeup(priv->control_block,
&powerstate, priv->device_base);
}
} else {
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_TRACING, "Assuming someone else called the IRQ\n");
#endif
spin_unlock(&priv->slock);
return IRQ_NONE;
}
/* sleep -> ready */
if (islpci_get_state(priv) == PRV_STATE_SLEEP
&& powerstate == ISL38XX_PSM_ACTIVE_STATE)
islpci_set_state(priv, PRV_STATE_READY);
/* !sleep -> sleep */
if (islpci_get_state(priv) != PRV_STATE_SLEEP
&& powerstate == ISL38XX_PSM_POWERSAVE_STATE)
islpci_set_state(priv, PRV_STATE_SLEEP);
/* unlock the interrupt handler */
spin_unlock(&priv->slock);
return IRQ_HANDLED;
}
/******************************************************************************
Network Interface Control & Statistical functions
******************************************************************************/
static int
islpci_open(struct net_device *ndev)
{
u32 rc;
islpci_private *priv = netdev_priv(ndev);
/* reset data structures, upload firmware and reset device */
rc = islpci_reset(priv,1);
if (rc) {
prism54_bring_down(priv);
return rc; /* Returns informative message */
}
netif_start_queue(ndev);
/* netif_mark_up( ndev ); */
return 0;
}
static int
islpci_close(struct net_device *ndev)
{
islpci_private *priv = netdev_priv(ndev);
printk(KERN_DEBUG "%s: islpci_close ()\n", ndev->name);
netif_stop_queue(ndev);
return prism54_bring_down(priv);
}
static int
prism54_bring_down(islpci_private *priv)
{
void __iomem *device_base = priv->device_base;
u32 reg;
/* we are going to shutdown the device */
islpci_set_state(priv, PRV_STATE_PREBOOT);
/* disable all device interrupts in case they weren't */
isl38xx_disable_interrupts(priv->device_base);
/* For safety reasons, we may want to ensure that no DMA transfer is
* currently in progress by emptying the TX and RX queues. */
/* wait until interrupts have finished executing on other CPUs */
synchronize_irq(priv->pdev->irq);
reg = readl(device_base + ISL38XX_CTRL_STAT_REG);
reg &= ~(ISL38XX_CTRL_STAT_RESET | ISL38XX_CTRL_STAT_RAMBOOT);
writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
wmb();
udelay(ISL38XX_WRITEIO_DELAY);
reg |= ISL38XX_CTRL_STAT_RESET;
writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
wmb();
udelay(ISL38XX_WRITEIO_DELAY);
/* clear the Reset bit */
reg &= ~ISL38XX_CTRL_STAT_RESET;
writel(reg, device_base + ISL38XX_CTRL_STAT_REG);
wmb();
/* wait a while for the device to reset */
schedule_timeout_uninterruptible(msecs_to_jiffies(50));
return 0;
}
static int
islpci_upload_fw(islpci_private *priv)
{
islpci_state_t old_state;
u32 rc;
old_state = islpci_set_state(priv, PRV_STATE_BOOT);
printk(KERN_DEBUG "%s: uploading firmware...\n", priv->ndev->name);
rc = isl_upload_firmware(priv);
if (rc) {
/* error uploading the firmware */
printk(KERN_ERR "%s: could not upload firmware ('%s')\n",
priv->ndev->name, priv->firmware);
islpci_set_state(priv, old_state);
return rc;
}
printk(KERN_DEBUG "%s: firmware upload complete\n",
priv->ndev->name);
islpci_set_state(priv, PRV_STATE_POSTBOOT);
return 0;
}
static int
islpci_reset_if(islpci_private *priv)
{
long remaining;
int result = -ETIME;
int count;
DEFINE_WAIT(wait);
prepare_to_wait(&priv->reset_done, &wait, TASK_UNINTERRUPTIBLE);
/* now the last step is to reset the interface */
isl38xx_interface_reset(priv->device_base, priv->device_host_address);
islpci_set_state(priv, PRV_STATE_PREINIT);
for(count = 0; count < 2 && result; count++) {
/* The software reset acknowledge needs about 220 msec here.
* Be conservative and wait for up to one second. */
remaining = schedule_timeout_uninterruptible(HZ);
if(remaining > 0) {
result = 0;
break;
}
/* If we're here it's because our IRQ hasn't yet gone through.
* Retry a bit more...
*/
printk(KERN_ERR "%s: no 'reset complete' IRQ seen - retrying\n",
priv->ndev->name);
}
finish_wait(&priv->reset_done, &wait);
if (result) {
printk(KERN_ERR "%s: interface reset failure\n", priv->ndev->name);
return result;
}
islpci_set_state(priv, PRV_STATE_INIT);
/* Now that the device is 100% up, let's allow
* for the other interrupts --
* NOTE: this is not *yet* true since we've only allowed the
* INIT interrupt on the IRQ line. We can perhaps poll
* the IRQ line until we know for sure the reset went through */
isl38xx_enable_common_interrupts(priv->device_base);
down_write(&priv->mib_sem);
result = mgt_commit(priv);
if (result) {
printk(KERN_ERR "%s: interface reset failure\n", priv->ndev->name);
up_write(&priv->mib_sem);
return result;
}
up_write(&priv->mib_sem);
islpci_set_state(priv, PRV_STATE_READY);
printk(KERN_DEBUG "%s: interface reset complete\n", priv->ndev->name);
return 0;
}
int
islpci_reset(islpci_private *priv, int reload_firmware)
{
isl38xx_control_block *cb = /* volatile not needed */
(isl38xx_control_block *) priv->control_block;
unsigned counter;
int rc;
if (reload_firmware)
islpci_set_state(priv, PRV_STATE_PREBOOT);
else
islpci_set_state(priv, PRV_STATE_POSTBOOT);
printk(KERN_DEBUG "%s: resetting device...\n", priv->ndev->name);
/* disable all device interrupts in case they weren't */
isl38xx_disable_interrupts(priv->device_base);
/* flush all management queues */
priv->index_mgmt_tx = 0;
priv->index_mgmt_rx = 0;
/* clear the indexes in the frame pointer */
for (counter = 0; counter < ISL38XX_CB_QCOUNT; counter++) {
cb->driver_curr_frag[counter] = cpu_to_le32(0);
cb->device_curr_frag[counter] = cpu_to_le32(0);
}
/* reset the mgmt receive queue */
for (counter = 0; counter < ISL38XX_CB_MGMT_QSIZE; counter++) {
isl38xx_fragment *frag = &cb->rx_data_mgmt[counter];
frag->size = cpu_to_le16(MGMT_FRAME_SIZE);
frag->flags = 0;
frag->address = cpu_to_le32(priv->mgmt_rx[counter].pci_addr);
}
for (counter = 0; counter < ISL38XX_CB_RX_QSIZE; counter++) {
cb->rx_data_low[counter].address =
cpu_to_le32((u32) priv->pci_map_rx_address[counter]);
}
/* since the receive queues are filled with empty fragments, now we can
* set the corresponding indexes in the Control Block */
priv->control_block->driver_curr_frag[ISL38XX_CB_RX_DATA_LQ] =
cpu_to_le32(ISL38XX_CB_RX_QSIZE);
priv->control_block->driver_curr_frag[ISL38XX_CB_RX_MGMTQ] =
cpu_to_le32(ISL38XX_CB_MGMT_QSIZE);
/* reset the remaining real index registers and full flags */
priv->free_data_rx = 0;
priv->free_data_tx = 0;
priv->data_low_tx_full = 0;
if (reload_firmware) { /* Should we load the firmware ? */
/* now that the data structures are cleaned up, upload
* firmware and reset interface */
rc = islpci_upload_fw(priv);
if (rc) {
printk(KERN_ERR "%s: islpci_reset: failure\n",
priv->ndev->name);
return rc;
}
}
/* finally reset interface */
rc = islpci_reset_if(priv);
if (rc)
printk(KERN_ERR "prism54: Your card/socket may be faulty, or IRQ line too busy :(\n");
return rc;
}
static struct net_device_stats *
islpci_statistics(struct net_device *ndev)
{
islpci_private *priv = netdev_priv(ndev);
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_FUNCTION_CALLS, "islpci_statistics\n");
#endif
return &priv->statistics;
}
/******************************************************************************
Network device configuration functions
******************************************************************************/
static int
islpci_alloc_memory(islpci_private *priv)
{
int counter;
#if VERBOSE > SHOW_ERROR_MESSAGES
printk(KERN_DEBUG "islpci_alloc_memory\n");
#endif
/* remap the PCI device base address to accessable */
if (!(priv->device_base =
ioremap(pci_resource_start(priv->pdev, 0),
ISL38XX_PCI_MEM_SIZE))) {
/* error in remapping the PCI device memory address range */
printk(KERN_ERR "PCI memory remapping failed \n");
return -1;
}
/* memory layout for consistent DMA region:
*
* Area 1: Control Block for the device interface
* Area 2: Power Save Mode Buffer for temporary frame storage. Be aware that
* the number of supported stations in the AP determines the minimal
* size of the buffer !
*/
/* perform the allocation */
priv->driver_mem_address = pci_alloc_consistent(priv->pdev,
HOST_MEM_BLOCK,
&priv->
device_host_address);
if (!priv->driver_mem_address) {
/* error allocating the block of PCI memory */
printk(KERN_ERR "%s: could not allocate DMA memory, aborting!",
"prism54");
return -1;
}
/* assign the Control Block to the first address of the allocated area */
priv->control_block =
(isl38xx_control_block *) priv->driver_mem_address;
/* set the Power Save Buffer pointer directly behind the CB */
priv->device_psm_buffer =
priv->device_host_address + CONTROL_BLOCK_SIZE;
/* make sure all buffer pointers are initialized */
for (counter = 0; counter < ISL38XX_CB_QCOUNT; counter++) {
priv->control_block->driver_curr_frag[counter] = cpu_to_le32(0);
priv->control_block->device_curr_frag[counter] = cpu_to_le32(0);
}
priv->index_mgmt_rx = 0;
memset(priv->mgmt_rx, 0, sizeof(priv->mgmt_rx));
memset(priv->mgmt_tx, 0, sizeof(priv->mgmt_tx));
/* allocate rx queue for management frames */
if (islpci_mgmt_rx_fill(priv->ndev) < 0)
goto out_free;
/* now get the data rx skb's */
memset(priv->data_low_rx, 0, sizeof (priv->data_low_rx));
memset(priv->pci_map_rx_address, 0, sizeof (priv->pci_map_rx_address));
for (counter = 0; counter < ISL38XX_CB_RX_QSIZE; counter++) {
struct sk_buff *skb;
/* allocate an sk_buff for received data frames storage
* each frame on receive size consists of 1 fragment
* include any required allignment operations */
if (!(skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2))) {
/* error allocating an sk_buff structure elements */
printk(KERN_ERR "Error allocating skb.\n");
skb = NULL;
goto out_free;
}
skb_reserve(skb, (4 - (long) skb->data) & 0x03);
/* add the new allocated sk_buff to the buffer array */
priv->data_low_rx[counter] = skb;
/* map the allocated skb data area to pci */
priv->pci_map_rx_address[counter] =
pci_map_single(priv->pdev, (void *) skb->data,
MAX_FRAGMENT_SIZE_RX + 2,
PCI_DMA_FROMDEVICE);
if (!priv->pci_map_rx_address[counter]) {
/* error mapping the buffer to device
accessable memory address */
printk(KERN_ERR "failed to map skb DMA'able\n");
goto out_free;
}
}
prism54_acl_init(&priv->acl);
prism54_wpa_bss_ie_init(priv);
if (mgt_init(priv))
goto out_free;
return 0;
out_free:
islpci_free_memory(priv);
return -1;
}
int
islpci_free_memory(islpci_private *priv)
{
int counter;
if (priv->device_base)
iounmap(priv->device_base);
priv->device_base = NULL;
/* free consistent DMA area... */
if (priv->driver_mem_address)
pci_free_consistent(priv->pdev, HOST_MEM_BLOCK,
priv->driver_mem_address,
priv->device_host_address);
/* clear some dangling pointers */
priv->driver_mem_address = NULL;
priv->device_host_address = 0;
priv->device_psm_buffer = 0;
priv->control_block = NULL;
/* clean up mgmt rx buffers */
for (counter = 0; counter < ISL38XX_CB_MGMT_QSIZE; counter++) {
struct islpci_membuf *buf = &priv->mgmt_rx[counter];
if (buf->pci_addr)
pci_unmap_single(priv->pdev, buf->pci_addr,
buf->size, PCI_DMA_FROMDEVICE);
buf->pci_addr = 0;
kfree(buf->mem);
buf->size = 0;
buf->mem = NULL;
}
/* clean up data rx buffers */
for (counter = 0; counter < ISL38XX_CB_RX_QSIZE; counter++) {
if (priv->pci_map_rx_address[counter])
pci_unmap_single(priv->pdev,
priv->pci_map_rx_address[counter],
MAX_FRAGMENT_SIZE_RX + 2,
PCI_DMA_FROMDEVICE);
priv->pci_map_rx_address[counter] = 0;
if (priv->data_low_rx[counter])
dev_kfree_skb(priv->data_low_rx[counter]);
priv->data_low_rx[counter] = NULL;
}
/* Free the acces control list and the WPA list */
prism54_acl_clean(&priv->acl);
prism54_wpa_bss_ie_clean(priv);
mgt_clean(priv);
return 0;
}
#if 0
static void
islpci_set_multicast_list(struct net_device *dev)
{
/* put device into promisc mode and let network layer handle it */
}
#endif
struct net_device *
islpci_setup(struct pci_dev *pdev)
{
islpci_private *priv;
struct net_device *ndev = alloc_etherdev(sizeof (islpci_private));
if (!ndev)
return ndev;
SET_MODULE_OWNER(ndev);
pci_set_drvdata(pdev, ndev);
#if defined(SET_NETDEV_DEV)
SET_NETDEV_DEV(ndev, &pdev->dev);
#endif
/* setup the structure members */
ndev->base_addr = pci_resource_start(pdev, 0);
ndev->irq = pdev->irq;
/* initialize the function pointers */
ndev->open = &islpci_open;
ndev->stop = &islpci_close;
ndev->get_stats = &islpci_statistics;
ndev->do_ioctl = &prism54_ioctl;
ndev->wireless_handlers =
(struct iw_handler_def *) &prism54_handler_def;
ndev->hard_start_xmit = &islpci_eth_transmit;
/* ndev->set_multicast_list = &islpci_set_multicast_list; */
ndev->addr_len = ETH_ALEN;
ndev->set_mac_address = &prism54_set_mac_address;
/* Get a non-zero dummy MAC address for nameif. Jean II */
memcpy(ndev->dev_addr, dummy_mac, 6);
#ifdef HAVE_TX_TIMEOUT
ndev->watchdog_timeo = ISLPCI_TX_TIMEOUT;
ndev->tx_timeout = &islpci_eth_tx_timeout;
#endif
/* allocate a private device structure to the network device */
priv = netdev_priv(ndev);
priv->ndev = ndev;
priv->pdev = pdev;
priv->monitor_type = ARPHRD_IEEE80211;
priv->ndev->type = (priv->iw_mode == IW_MODE_MONITOR) ?
priv->monitor_type : ARPHRD_ETHER;
/* Add pointers to enable iwspy support. */
priv->wireless_data.spy_data = &priv->spy_data;
ndev->wireless_data = &priv->wireless_data;
/* save the start and end address of the PCI memory area */
ndev->mem_start = (unsigned long) priv->device_base;
ndev->mem_end = ndev->mem_start + ISL38XX_PCI_MEM_SIZE;
#if VERBOSE > SHOW_ERROR_MESSAGES
DEBUG(SHOW_TRACING, "PCI Memory remapped to 0x%p\n", priv->device_base);
#endif
init_waitqueue_head(&priv->reset_done);
/* init the queue read locks, process wait counter */
sema_init(&priv->mgmt_sem, 1);
priv->mgmt_received = NULL;
init_waitqueue_head(&priv->mgmt_wqueue);
sema_init(&priv->stats_sem, 1);
spin_lock_init(&priv->slock);
/* init state machine with off#1 state */
priv->state = PRV_STATE_OFF;
priv->state_off = 1;
/* initialize workqueue's */
INIT_WORK(&priv->stats_work,
(void (*)(void *)) prism54_update_stats, priv);
priv->stats_timestamp = 0;
INIT_WORK(&priv->reset_task, islpci_do_reset_and_wake, priv);
priv->reset_task_pending = 0;
/* allocate various memory areas */
if (islpci_alloc_memory(priv))
goto do_free_netdev;
/* select the firmware file depending on the device id */
switch (pdev->device) {
case 0x3877:
strcpy(priv->firmware, ISL3877_IMAGE_FILE);
break;
case 0x3886:
strcpy(priv->firmware, ISL3886_IMAGE_FILE);
break;
default:
strcpy(priv->firmware, ISL3890_IMAGE_FILE);
break;
}
if (register_netdev(ndev)) {
DEBUG(SHOW_ERROR_MESSAGES,
"ERROR: register_netdev() failed \n");
goto do_islpci_free_memory;
}
return ndev;
do_islpci_free_memory:
islpci_free_memory(priv);
do_free_netdev:
pci_set_drvdata(pdev, NULL);
free_netdev(ndev);
priv = NULL;
return NULL;
}
islpci_state_t
islpci_set_state(islpci_private *priv, islpci_state_t new_state)
{
islpci_state_t old_state;
/* lock */
old_state = priv->state;
/* this means either a race condition or some serious error in
* the driver code */
switch (new_state) {
case PRV_STATE_OFF:
priv->state_off++;
default:
priv->state = new_state;
break;
case PRV_STATE_PREBOOT:
/* there are actually many off-states, enumerated by
* state_off */
if (old_state == PRV_STATE_OFF)
priv->state_off--;
/* only if hw_unavailable is zero now it means we either
* were in off#1 state, or came here from
* somewhere else */
if (!priv->state_off)
priv->state = new_state;
break;
};
#if 0
printk(KERN_DEBUG "%s: state transition %d -> %d (off#%d)\n",
priv->ndev->name, old_state, new_state, priv->state_off);
#endif
/* invariants */
BUG_ON(priv->state_off < 0);
BUG_ON(priv->state_off && (priv->state != PRV_STATE_OFF));
BUG_ON(!priv->state_off && (priv->state == PRV_STATE_OFF));
/* unlock */
return old_state;
}
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