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kernel-fxtec-pro1x/drivers/net/netx-eth.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

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/*
* drivers/net/netx-eth.c
*
* Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* 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/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/platform_device.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/mii.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/arch/hardware.h>
#include <asm/arch/netx-regs.h>
#include <asm/arch/pfifo.h>
#include <asm/arch/xc.h>
#include <asm/arch/eth.h>
/* XC Fifo Offsets */
#define EMPTY_PTR_FIFO(xcno) (0 + ((xcno) << 3)) /* Index of the empty pointer FIFO */
#define IND_FIFO_PORT_HI(xcno) (1 + ((xcno) << 3)) /* Index of the FIFO where received */
/* Data packages are indicated by XC */
#define IND_FIFO_PORT_LO(xcno) (2 + ((xcno) << 3)) /* Index of the FIFO where received */
/* Data packages are indicated by XC */
#define REQ_FIFO_PORT_HI(xcno) (3 + ((xcno) << 3)) /* Index of the FIFO where Data packages */
/* have to be indicated by ARM which */
/* shall be sent */
#define REQ_FIFO_PORT_LO(xcno) (4 + ((xcno) << 3)) /* Index of the FIFO where Data packages */
/* have to be indicated by ARM which shall */
/* be sent */
#define CON_FIFO_PORT_HI(xcno) (5 + ((xcno) << 3)) /* Index of the FIFO where sent Data packages */
/* are confirmed */
#define CON_FIFO_PORT_LO(xcno) (6 + ((xcno) << 3)) /* Index of the FIFO where sent Data */
/* packages are confirmed */
#define PFIFO_MASK(xcno) (0x7f << (xcno*8))
#define FIFO_PTR_FRAMELEN_SHIFT 0
#define FIFO_PTR_FRAMELEN_MASK (0x7ff << 0)
#define FIFO_PTR_FRAMELEN(len) (((len) << 0) & FIFO_PTR_FRAMELEN_MASK)
#define FIFO_PTR_TIMETRIG (1<<11)
#define FIFO_PTR_MULTI_REQ
#define FIFO_PTR_ORIGIN (1<<14)
#define FIFO_PTR_VLAN (1<<15)
#define FIFO_PTR_FRAMENO_SHIFT 16
#define FIFO_PTR_FRAMENO_MASK (0x3f << 16)
#define FIFO_PTR_FRAMENO(no) (((no) << 16) & FIFO_PTR_FRAMENO_MASK)
#define FIFO_PTR_SEGMENT_SHIFT 22
#define FIFO_PTR_SEGMENT_MASK (0xf << 22)
#define FIFO_PTR_SEGMENT(seg) (((seg) & 0xf) << 22)
#define FIFO_PTR_ERROR_SHIFT 28
#define FIFO_PTR_ERROR_MASK (0xf << 28)
#define ISR_LINK_STATUS_CHANGE (1<<4)
#define ISR_IND_LO (1<<3)
#define ISR_CON_LO (1<<2)
#define ISR_IND_HI (1<<1)
#define ISR_CON_HI (1<<0)
#define ETH_MAC_LOCAL_CONFIG 0x1560
#define ETH_MAC_4321 0x1564
#define ETH_MAC_65 0x1568
#define MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT 16
#define MAC_TRAFFIC_CLASS_ARRANGEMENT_MASK (0xf<<MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT)
#define MAC_TRAFFIC_CLASS_ARRANGEMENT(x) (((x)<<MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT) & MAC_TRAFFIC_CLASS_ARRANGEMENT_MASK)
#define LOCAL_CONFIG_LINK_STATUS_IRQ_EN (1<<24)
#define LOCAL_CONFIG_CON_LO_IRQ_EN (1<<23)
#define LOCAL_CONFIG_CON_HI_IRQ_EN (1<<22)
#define LOCAL_CONFIG_IND_LO_IRQ_EN (1<<21)
#define LOCAL_CONFIG_IND_HI_IRQ_EN (1<<20)
#define CARDNAME "netx-eth"
/* LSB must be zero */
#define INTERNAL_PHY_ADR 0x1c
struct netx_eth_priv {
void __iomem *sram_base, *xpec_base, *xmac_base;
int id;
struct net_device_stats stats;
struct mii_if_info mii;
u32 msg_enable;
struct xc *xc;
spinlock_t lock;
};
static void netx_eth_set_multicast_list(struct net_device *ndev)
{
/* implement me */
}
static int
netx_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct netx_eth_priv *priv = netdev_priv(ndev);
unsigned char *buf = skb->data;
unsigned int len = skb->len;
spin_lock_irq(&priv->lock);
memcpy_toio(priv->sram_base + 1560, (void *)buf, len);
if (len < 60) {
memset_io(priv->sram_base + 1560 + len, 0, 60 - len);
len = 60;
}
pfifo_push(REQ_FIFO_PORT_LO(priv->id),
FIFO_PTR_SEGMENT(priv->id) |
FIFO_PTR_FRAMENO(1) |
FIFO_PTR_FRAMELEN(len));
ndev->trans_start = jiffies;
priv->stats.tx_packets++;
priv->stats.tx_bytes += skb->len;
netif_stop_queue(ndev);
spin_unlock_irq(&priv->lock);
dev_kfree_skb(skb);
return 0;
}
static void netx_eth_receive(struct net_device *ndev)
{
struct netx_eth_priv *priv = netdev_priv(ndev);
unsigned int val, frameno, seg, len;
unsigned char *data;
struct sk_buff *skb;
val = pfifo_pop(IND_FIFO_PORT_LO(priv->id));
frameno = (val & FIFO_PTR_FRAMENO_MASK) >> FIFO_PTR_FRAMENO_SHIFT;
seg = (val & FIFO_PTR_SEGMENT_MASK) >> FIFO_PTR_SEGMENT_SHIFT;
len = (val & FIFO_PTR_FRAMELEN_MASK) >> FIFO_PTR_FRAMELEN_SHIFT;
skb = dev_alloc_skb(len);
if (unlikely(skb == NULL)) {
printk(KERN_NOTICE "%s: Low memory, packet dropped.\n",
ndev->name);
priv->stats.rx_dropped++;
return;
}
data = skb_put(skb, len);
memcpy_fromio(data, priv->sram_base + frameno * 1560, len);
pfifo_push(EMPTY_PTR_FIFO(priv->id),
FIFO_PTR_SEGMENT(seg) | FIFO_PTR_FRAMENO(frameno));
ndev->last_rx = jiffies;
skb->dev = ndev;
skb->protocol = eth_type_trans(skb, ndev);
netif_rx(skb);
priv->stats.rx_packets++;
priv->stats.rx_bytes += len;
}
static irqreturn_t
netx_eth_interrupt(int irq, void *dev_id)
{
struct net_device *ndev = dev_id;
struct netx_eth_priv *priv = netdev_priv(ndev);
int status;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
status = readl(NETX_PFIFO_XPEC_ISR(priv->id));
while (status) {
int fill_level;
writel(status, NETX_PFIFO_XPEC_ISR(priv->id));
if ((status & ISR_CON_HI) || (status & ISR_IND_HI))
printk("%s: unexpected status: 0x%08x\n",
__FUNCTION__, status);
fill_level =
readl(NETX_PFIFO_FILL_LEVEL(IND_FIFO_PORT_LO(priv->id)));
while (fill_level--)
netx_eth_receive(ndev);
if (status & ISR_CON_LO)
netif_wake_queue(ndev);
if (status & ISR_LINK_STATUS_CHANGE)
mii_check_media(&priv->mii, netif_msg_link(priv), 1);
status = readl(NETX_PFIFO_XPEC_ISR(priv->id));
}
spin_unlock_irqrestore(&priv->lock, flags);
return IRQ_HANDLED;
}
static struct net_device_stats *netx_eth_query_statistics(struct net_device *ndev)
{
struct netx_eth_priv *priv = netdev_priv(ndev);
return &priv->stats;
}
static int netx_eth_open(struct net_device *ndev)
{
struct netx_eth_priv *priv = netdev_priv(ndev);
if (request_irq
(ndev->irq, &netx_eth_interrupt, IRQF_SHARED, ndev->name, ndev))
return -EAGAIN;
writel(ndev->dev_addr[0] |
ndev->dev_addr[1]<<8 |
ndev->dev_addr[2]<<16 |
ndev->dev_addr[3]<<24,
priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_4321);
writel(ndev->dev_addr[4] |
ndev->dev_addr[5]<<8,
priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_65);
writel(LOCAL_CONFIG_LINK_STATUS_IRQ_EN |
LOCAL_CONFIG_CON_LO_IRQ_EN |
LOCAL_CONFIG_CON_HI_IRQ_EN |
LOCAL_CONFIG_IND_LO_IRQ_EN |
LOCAL_CONFIG_IND_HI_IRQ_EN,
priv->xpec_base + NETX_XPEC_RAM_START_OFS +
ETH_MAC_LOCAL_CONFIG);
mii_check_media(&priv->mii, netif_msg_link(priv), 1);
netif_start_queue(ndev);
return 0;
}
static int netx_eth_close(struct net_device *ndev)
{
struct netx_eth_priv *priv = netdev_priv(ndev);
netif_stop_queue(ndev);
writel(0,
priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_LOCAL_CONFIG);
free_irq(ndev->irq, ndev);
return 0;
}
static void netx_eth_timeout(struct net_device *ndev)
{
struct netx_eth_priv *priv = netdev_priv(ndev);
int i;
printk(KERN_ERR "%s: transmit timed out, resetting\n", ndev->name);
spin_lock_irq(&priv->lock);
xc_reset(priv->xc);
xc_start(priv->xc);
for (i=2; i<=18; i++)
pfifo_push(EMPTY_PTR_FIFO(priv->id),
FIFO_PTR_FRAMENO(i) | FIFO_PTR_SEGMENT(priv->id));
spin_unlock_irq(&priv->lock);
netif_wake_queue(ndev);
}
static int
netx_eth_phy_read(struct net_device *ndev, int phy_id, int reg)
{
unsigned int val;
val = MIIMU_SNRDY | MIIMU_PREAMBLE | MIIMU_PHYADDR(phy_id) |
MIIMU_REGADDR(reg) | MIIMU_PHY_NRES;
writel(val, NETX_MIIMU);
while (readl(NETX_MIIMU) & MIIMU_SNRDY);
return readl(NETX_MIIMU) >> 16;
}
static void
netx_eth_phy_write(struct net_device *ndev, int phy_id, int reg, int value)
{
unsigned int val;
val = MIIMU_SNRDY | MIIMU_PREAMBLE | MIIMU_PHYADDR(phy_id) |
MIIMU_REGADDR(reg) | MIIMU_PHY_NRES | MIIMU_OPMODE_WRITE |
MIIMU_DATA(value);
writel(val, NETX_MIIMU);
while (readl(NETX_MIIMU) & MIIMU_SNRDY);
}
static int netx_eth_enable(struct net_device *ndev)
{
struct netx_eth_priv *priv = netdev_priv(ndev);
unsigned int mac4321, mac65;
int running, i;
ether_setup(ndev);
ndev->open = netx_eth_open;
ndev->stop = netx_eth_close;
ndev->hard_start_xmit = netx_eth_hard_start_xmit;
ndev->tx_timeout = netx_eth_timeout;
ndev->watchdog_timeo = msecs_to_jiffies(5000);
ndev->get_stats = netx_eth_query_statistics;
ndev->set_multicast_list = netx_eth_set_multicast_list;
priv->msg_enable = NETIF_MSG_LINK;
priv->mii.phy_id_mask = 0x1f;
priv->mii.reg_num_mask = 0x1f;
priv->mii.force_media = 0;
priv->mii.full_duplex = 0;
priv->mii.dev = ndev;
priv->mii.mdio_read = netx_eth_phy_read;
priv->mii.mdio_write = netx_eth_phy_write;
priv->mii.phy_id = INTERNAL_PHY_ADR + priv->id;
running = xc_running(priv->xc);
xc_stop(priv->xc);
/* if the xc engine is already running, assume the bootloader has
* loaded the firmware for us
*/
if (running) {
/* get Node Address from hardware */
mac4321 = readl(priv->xpec_base +
NETX_XPEC_RAM_START_OFS + ETH_MAC_4321);
mac65 = readl(priv->xpec_base +
NETX_XPEC_RAM_START_OFS + ETH_MAC_65);
ndev->dev_addr[0] = mac4321 & 0xff;
ndev->dev_addr[1] = (mac4321 >> 8) & 0xff;
ndev->dev_addr[2] = (mac4321 >> 16) & 0xff;
ndev->dev_addr[3] = (mac4321 >> 24) & 0xff;
ndev->dev_addr[4] = mac65 & 0xff;
ndev->dev_addr[5] = (mac65 >> 8) & 0xff;
} else {
if (xc_request_firmware(priv->xc)) {
printk(CARDNAME ": requesting firmware failed\n");
return -ENODEV;
}
}
xc_reset(priv->xc);
xc_start(priv->xc);
if (!is_valid_ether_addr(ndev->dev_addr))
printk("%s: Invalid ethernet MAC address. Please "
"set using ifconfig\n", ndev->name);
for (i=2; i<=18; i++)
pfifo_push(EMPTY_PTR_FIFO(priv->id),
FIFO_PTR_FRAMENO(i) | FIFO_PTR_SEGMENT(priv->id));
return register_netdev(ndev);
}
static int netx_eth_drv_probe(struct platform_device *pdev)
{
struct netx_eth_priv *priv;
struct net_device *ndev;
struct netxeth_platform_data *pdata;
int ret;
ndev = alloc_etherdev(sizeof (struct netx_eth_priv));
if (!ndev) {
printk("%s: could not allocate device.\n", CARDNAME);
ret = -ENOMEM;
goto exit;
}
SET_MODULE_OWNER(ndev);
SET_NETDEV_DEV(ndev, &pdev->dev);
platform_set_drvdata(pdev, ndev);
priv = netdev_priv(ndev);
pdata = (struct netxeth_platform_data *)pdev->dev.platform_data;
priv->xc = request_xc(pdata->xcno, &pdev->dev);
if (!priv->xc) {
dev_err(&pdev->dev, "unable to request xc engine\n");
ret = -ENODEV;
goto exit_free_netdev;
}
ndev->irq = priv->xc->irq;
priv->id = pdev->id;
priv->xpec_base = priv->xc->xpec_base;
priv->xmac_base = priv->xc->xmac_base;
priv->sram_base = priv->xc->sram_base;
ret = pfifo_request(PFIFO_MASK(priv->id));
if (ret) {
printk("unable to request PFIFO\n");
goto exit_free_xc;
}
ret = netx_eth_enable(ndev);
if (ret)
goto exit_free_pfifo;
return 0;
exit_free_pfifo:
pfifo_free(PFIFO_MASK(priv->id));
exit_free_xc:
free_xc(priv->xc);
exit_free_netdev:
platform_set_drvdata(pdev, NULL);
free_netdev(ndev);
exit:
return ret;
}
static int netx_eth_drv_remove(struct platform_device *pdev)
{
struct net_device *ndev = dev_get_drvdata(&pdev->dev);
struct netx_eth_priv *priv = netdev_priv(ndev);
platform_set_drvdata(pdev, NULL);
unregister_netdev(ndev);
xc_stop(priv->xc);
free_xc(priv->xc);
free_netdev(ndev);
pfifo_free(PFIFO_MASK(priv->id));
return 0;
}
static int netx_eth_drv_suspend(struct platform_device *pdev, pm_message_t state)
{
dev_err(&pdev->dev, "suspend not implemented\n");
return 0;
}
static int netx_eth_drv_resume(struct platform_device *pdev)
{
dev_err(&pdev->dev, "resume not implemented\n");
return 0;
}
static struct platform_driver netx_eth_driver = {
.probe = netx_eth_drv_probe,
.remove = netx_eth_drv_remove,
.suspend = netx_eth_drv_suspend,
.resume = netx_eth_drv_resume,
.driver = {
.name = CARDNAME,
.owner = THIS_MODULE,
},
};
static int __init netx_eth_init(void)
{
unsigned int phy_control, val;
printk("NetX Ethernet driver\n");
phy_control = PHY_CONTROL_PHY_ADDRESS(INTERNAL_PHY_ADR>>1) |
PHY_CONTROL_PHY1_MODE(PHY_MODE_ALL) |
PHY_CONTROL_PHY1_AUTOMDIX |
PHY_CONTROL_PHY1_EN |
PHY_CONTROL_PHY0_MODE(PHY_MODE_ALL) |
PHY_CONTROL_PHY0_AUTOMDIX |
PHY_CONTROL_PHY0_EN |
PHY_CONTROL_CLK_XLATIN;
val = readl(NETX_SYSTEM_IOC_ACCESS_KEY);
writel(val, NETX_SYSTEM_IOC_ACCESS_KEY);
writel(phy_control | PHY_CONTROL_RESET, NETX_SYSTEM_PHY_CONTROL);
udelay(100);
val = readl(NETX_SYSTEM_IOC_ACCESS_KEY);
writel(val, NETX_SYSTEM_IOC_ACCESS_KEY);
writel(phy_control, NETX_SYSTEM_PHY_CONTROL);
return platform_driver_register(&netx_eth_driver);
}
static void __exit netx_eth_cleanup(void)
{
platform_driver_unregister(&netx_eth_driver);
}
module_init(netx_eth_init);
module_exit(netx_eth_cleanup);
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
MODULE_LICENSE("GPL");
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