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linux/drivers/net/8390.h
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

214 lines
8.7 KiB
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/* Generic NS8390 register definitions. */
/* This file is part of Donald Becker's 8390 drivers, and is distributed
under the same license. Auto-loading of 8390.o only in v2.2 - Paul G.
Some of these names and comments originated from the Crynwr
packet drivers, which are distributed under the GPL. */
#ifndef _8390_h
#define _8390_h
#include <linux/if_ether.h>
#include <linux/ioport.h>
#include <linux/skbuff.h>
#define TX_PAGES 12 /* Two Tx slots */
#define ETHER_ADDR_LEN 6
/* The 8390 specific per-packet-header format. */
struct e8390_pkt_hdr {
unsigned char status; /* status */
unsigned char next; /* pointer to next packet. */
unsigned short count; /* header + packet length in bytes */
};
#ifdef notdef
extern int ei_debug;
#else
#define ei_debug 1
#endif
#ifdef CONFIG_NET_POLL_CONTROLLER
extern void ei_poll(struct net_device *dev);
#endif
extern void NS8390_init(struct net_device *dev, int startp);
extern int ei_open(struct net_device *dev);
extern int ei_close(struct net_device *dev);
extern irqreturn_t ei_interrupt(int irq, void *dev_id);
extern struct net_device *__alloc_ei_netdev(int size);
static inline struct net_device *alloc_ei_netdev(void)
{
return __alloc_ei_netdev(0);
}
/* You have one of these per-board */
struct ei_device {
const char *name;
void (*reset_8390)(struct net_device *);
void (*get_8390_hdr)(struct net_device *, struct e8390_pkt_hdr *, int);
void (*block_output)(struct net_device *, int, const unsigned char *, int);
void (*block_input)(struct net_device *, int, struct sk_buff *, int);
unsigned long rmem_start;
unsigned long rmem_end;
void __iomem *mem;
unsigned char mcfilter[8];
unsigned open:1;
unsigned word16:1; /* We have the 16-bit (vs 8-bit) version of the card. */
unsigned bigendian:1; /* 16-bit big endian mode. Do NOT */
/* set this on random 8390 clones! */
unsigned txing:1; /* Transmit Active */
unsigned irqlock:1; /* 8390's intrs disabled when '1'. */
unsigned dmaing:1; /* Remote DMA Active */
unsigned char tx_start_page, rx_start_page, stop_page;
unsigned char current_page; /* Read pointer in buffer */
unsigned char interface_num; /* Net port (AUI, 10bT.) to use. */
unsigned char txqueue; /* Tx Packet buffer queue length. */
short tx1, tx2; /* Packet lengths for ping-pong tx. */
short lasttx; /* Alpha version consistency check. */
unsigned char reg0; /* Register '0' in a WD8013 */
unsigned char reg5; /* Register '5' in a WD8013 */
unsigned char saved_irq; /* Original dev->irq value. */
struct net_device_stats stat; /* The new statistics table. */
u32 *reg_offset; /* Register mapping table */
spinlock_t page_lock; /* Page register locks */
unsigned long priv; /* Private field to store bus IDs etc. */
};
/* The maximum number of 8390 interrupt service routines called per IRQ. */
#define MAX_SERVICE 12
/* The maximum time waited (in jiffies) before assuming a Tx failed. (20ms) */
#define TX_TIMEOUT (20*HZ/100)
#define ei_status (*(struct ei_device *)netdev_priv(dev))
/* Some generic ethernet register configurations. */
#define E8390_TX_IRQ_MASK 0xa /* For register EN0_ISR */
#define E8390_RX_IRQ_MASK 0x5
#define E8390_RXCONFIG 0x4 /* EN0_RXCR: broadcasts, no multicast,errors */
#define E8390_RXOFF 0x20 /* EN0_RXCR: Accept no packets */
#define E8390_TXCONFIG 0x00 /* EN0_TXCR: Normal transmit mode */
#define E8390_TXOFF 0x02 /* EN0_TXCR: Transmitter off */
/* Register accessed at EN_CMD, the 8390 base addr. */
#define E8390_STOP 0x01 /* Stop and reset the chip */
#define E8390_START 0x02 /* Start the chip, clear reset */
#define E8390_TRANS 0x04 /* Transmit a frame */
#define E8390_RREAD 0x08 /* Remote read */
#define E8390_RWRITE 0x10 /* Remote write */
#define E8390_NODMA 0x20 /* Remote DMA */
#define E8390_PAGE0 0x00 /* Select page chip registers */
#define E8390_PAGE1 0x40 /* using the two high-order bits */
#define E8390_PAGE2 0x80 /* Page 3 is invalid. */
/*
* Only generate indirect loads given a machine that needs them.
* - removed AMIGA_PCMCIA from this list, handled as ISA io now
*/
#if defined(CONFIG_MAC) || \
defined(CONFIG_ZORRO8390) || defined(CONFIG_ZORRO8390_MODULE) || \
defined(CONFIG_HYDRA) || defined(CONFIG_HYDRA_MODULE)
#define EI_SHIFT(x) (ei_local->reg_offset[x])
#undef inb
#undef inb_p
#undef outb
#undef outb_p
#define inb(port) in_8(port)
#define outb(val,port) out_8(port,val)
#define inb_p(port) in_8(port)
#define outb_p(val,port) out_8(port,val)
#elif defined(CONFIG_ARM_ETHERH) || defined(CONFIG_ARM_ETHERH_MODULE)
#define EI_SHIFT(x) (ei_local->reg_offset[x])
#undef inb
#undef inb_p
#undef outb
#undef outb_p
#define inb(_p) readb(_p)
#define outb(_v,_p) writeb(_v,_p)
#define inb_p(_p) inb(_p)
#define outb_p(_v,_p) outb(_v,_p)
#elif defined(CONFIG_NE_H8300) || defined(CONFIG_NE_H8300_MODULE)
#define EI_SHIFT(x) (ei_local->reg_offset[x])
#else
#define EI_SHIFT(x) (x)
#endif
#define E8390_CMD EI_SHIFT(0x00) /* The command register (for all pages) */
/* Page 0 register offsets. */
#define EN0_CLDALO EI_SHIFT(0x01) /* Low byte of current local dma addr RD */
#define EN0_STARTPG EI_SHIFT(0x01) /* Starting page of ring bfr WR */
#define EN0_CLDAHI EI_SHIFT(0x02) /* High byte of current local dma addr RD */
#define EN0_STOPPG EI_SHIFT(0x02) /* Ending page +1 of ring bfr WR */
#define EN0_BOUNDARY EI_SHIFT(0x03) /* Boundary page of ring bfr RD WR */
#define EN0_TSR EI_SHIFT(0x04) /* Transmit status reg RD */
#define EN0_TPSR EI_SHIFT(0x04) /* Transmit starting page WR */
#define EN0_NCR EI_SHIFT(0x05) /* Number of collision reg RD */
#define EN0_TCNTLO EI_SHIFT(0x05) /* Low byte of tx byte count WR */
#define EN0_FIFO EI_SHIFT(0x06) /* FIFO RD */
#define EN0_TCNTHI EI_SHIFT(0x06) /* High byte of tx byte count WR */
#define EN0_ISR EI_SHIFT(0x07) /* Interrupt status reg RD WR */
#define EN0_CRDALO EI_SHIFT(0x08) /* low byte of current remote dma address RD */
#define EN0_RSARLO EI_SHIFT(0x08) /* Remote start address reg 0 */
#define EN0_CRDAHI EI_SHIFT(0x09) /* high byte, current remote dma address RD */
#define EN0_RSARHI EI_SHIFT(0x09) /* Remote start address reg 1 */
#define EN0_RCNTLO EI_SHIFT(0x0a) /* Remote byte count reg WR */
#define EN0_RCNTHI EI_SHIFT(0x0b) /* Remote byte count reg WR */
#define EN0_RSR EI_SHIFT(0x0c) /* rx status reg RD */
#define EN0_RXCR EI_SHIFT(0x0c) /* RX configuration reg WR */
#define EN0_TXCR EI_SHIFT(0x0d) /* TX configuration reg WR */
#define EN0_COUNTER0 EI_SHIFT(0x0d) /* Rcv alignment error counter RD */
#define EN0_DCFG EI_SHIFT(0x0e) /* Data configuration reg WR */
#define EN0_COUNTER1 EI_SHIFT(0x0e) /* Rcv CRC error counter RD */
#define EN0_IMR EI_SHIFT(0x0f) /* Interrupt mask reg WR */
#define EN0_COUNTER2 EI_SHIFT(0x0f) /* Rcv missed frame error counter RD */
/* Bits in EN0_ISR - Interrupt status register */
#define ENISR_RX 0x01 /* Receiver, no error */
#define ENISR_TX 0x02 /* Transmitter, no error */
#define ENISR_RX_ERR 0x04 /* Receiver, with error */
#define ENISR_TX_ERR 0x08 /* Transmitter, with error */
#define ENISR_OVER 0x10 /* Receiver overwrote the ring */
#define ENISR_COUNTERS 0x20 /* Counters need emptying */
#define ENISR_RDC 0x40 /* remote dma complete */
#define ENISR_RESET 0x80 /* Reset completed */
#define ENISR_ALL 0x3f /* Interrupts we will enable */
/* Bits in EN0_DCFG - Data config register */
#define ENDCFG_WTS 0x01 /* word transfer mode selection */
#define ENDCFG_BOS 0x02 /* byte order selection */
/* Page 1 register offsets. */
#define EN1_PHYS EI_SHIFT(0x01) /* This board's physical enet addr RD WR */
#define EN1_PHYS_SHIFT(i) EI_SHIFT(i+1) /* Get and set mac address */
#define EN1_CURPAG EI_SHIFT(0x07) /* Current memory page RD WR */
#define EN1_MULT EI_SHIFT(0x08) /* Multicast filter mask array (8 bytes) RD WR */
#define EN1_MULT_SHIFT(i) EI_SHIFT(8+i) /* Get and set multicast filter */
/* Bits in received packet status byte and EN0_RSR*/
#define ENRSR_RXOK 0x01 /* Received a good packet */
#define ENRSR_CRC 0x02 /* CRC error */
#define ENRSR_FAE 0x04 /* frame alignment error */
#define ENRSR_FO 0x08 /* FIFO overrun */
#define ENRSR_MPA 0x10 /* missed pkt */
#define ENRSR_PHY 0x20 /* physical/multicast address */
#define ENRSR_DIS 0x40 /* receiver disable. set in monitor mode */
#define ENRSR_DEF 0x80 /* deferring */
/* Transmitted packet status, EN0_TSR. */
#define ENTSR_PTX 0x01 /* Packet transmitted without error */
#define ENTSR_ND 0x02 /* The transmit wasn't deferred. */
#define ENTSR_COL 0x04 /* The transmit collided at least once. */
#define ENTSR_ABT 0x08 /* The transmit collided 16 times, and was deferred. */
#define ENTSR_CRS 0x10 /* The carrier sense was lost. */
#define ENTSR_FU 0x20 /* A "FIFO underrun" occurred during transmit. */
#define ENTSR_CDH 0x40 /* The collision detect "heartbeat" signal was lost. */
#define ENTSR_OWC 0x80 /* There was an out-of-window collision. */
#endif /* _8390_h */
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