path: root/drivers/net/myri_sbus.c

/* myri_sbus.c: MyriCOM MyriNET SBUS card driver.
 *
 * Copyright (C) 1996, 1999, 2006, 2008 David S. Miller (davem@davemloft.net)
 */

static char version[] =
        "myri_sbus.c:v2.0 June 23, 2006 David S. Miller (davem@davemloft.net)\n";

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/of_device.h>

#include <net/dst.h>
#include <net/arp.h>
#include <net/sock.h>
#include <net/ipv6.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>
#include <asm/idprom.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/auxio.h>
#include <asm/pgtable.h>
#include <asm/irq.h>

#include "myri_sbus.h"
#include "myri_code.h"

/* #define DEBUG_DETECT */
/* #define DEBUG_IRQ */
/* #define DEBUG_TRANSMIT */
/* #define DEBUG_RECEIVE */
/* #define DEBUG_HEADER */

#ifdef DEBUG_DETECT
#define DET(x)   printk x
#else
#define DET(x)
#endif

#ifdef DEBUG_IRQ
#define DIRQ(x)  printk x
#else
#define DIRQ(x)
#endif

#ifdef DEBUG_TRANSMIT
#define DTX(x)  printk x
#else
#define DTX(x)
#endif

#ifdef DEBUG_RECEIVE
#define DRX(x)  printk x
#else
#define DRX(x)
#endif

#ifdef DEBUG_HEADER
#define DHDR(x) printk x
#else
#define DHDR(x)
#endif

static void myri_reset_off(void __iomem *lp, void __iomem *cregs)
{
	/* Clear IRQ mask. */
	sbus_writel(0, lp + LANAI_EIMASK);

	/* Turn RESET function off. */
	sbus_writel(CONTROL_ROFF, cregs + MYRICTRL_CTRL);
}

static void myri_reset_on(void __iomem *cregs)
{
	/* Enable RESET function. */
	sbus_writel(CONTROL_RON, cregs + MYRICTRL_CTRL);

	/* Disable IRQ's. */
	sbus_writel(CONTROL_DIRQ, cregs + MYRICTRL_CTRL);
}

static void myri_disable_irq(void __iomem *lp, void __iomem *cregs)
{
	sbus_writel(CONTROL_DIRQ, cregs + MYRICTRL_CTRL);
	sbus_writel(0, lp + LANAI_EIMASK);
	sbus_writel(ISTAT_HOST, lp + LANAI_ISTAT);
}

static void myri_enable_irq(void __iomem *lp, void __iomem *cregs)
{
	sbus_writel(CONTROL_EIRQ, cregs + MYRICTRL_CTRL);
	sbus_writel(ISTAT_HOST, lp + LANAI_EIMASK);
}

static inline void bang_the_chip(struct myri_eth *mp)
{
	struct myri_shmem __iomem *shmem = mp->shmem;
	void __iomem *cregs		= mp->cregs;

	sbus_writel(1, &shmem->send);
	sbus_writel(CONTROL_WON, cregs + MYRICTRL_CTRL);
}

static int myri_do_handshake(struct myri_eth *mp)
{
	struct myri_shmem __iomem *shmem = mp->shmem;
	void __iomem *cregs = mp->cregs;
	struct myri_channel __iomem *chan = &shmem->channel;
	int tick 			= 0;

	DET(("myri_do_handshake: "));
	if (sbus_readl(&chan->state) == STATE_READY) {
		DET(("Already STATE_READY, failed.\n"));
		return -1;	/* We're hosed... */
	}

	myri_disable_irq(mp->lregs, cregs);

	while (tick++ < 25) {
		u32 softstate;

		/* Wake it up. */
		DET(("shakedown, CONTROL_WON, "));
		sbus_writel(1, &shmem->shakedown);
		sbus_writel(CONTROL_WON, cregs + MYRICTRL_CTRL);

		softstate = sbus_readl(&chan->state);
		DET(("chanstate[%08x] ", softstate));
		if