ax88796.c

/* drivers/net/ax88796.c
 *
 * Copyright 2005,2007 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * Asix AX88796 10/100 Ethernet controller support
 *	Based on ne.c, by Donald Becker, et-al.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/isapnp.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/mdio-bitbang.h>
#include <linux/phy.h>
#include <linux/eeprom_93cx6.h>
#include <linux/slab.h>

#include <net/ax88796.h>

#include <asm/system.h>

/* Rename the lib8390.c functions to show that they are in this driver */
#define __ei_open ax_ei_open
#define __ei_close ax_ei_close
#define __ei_poll ax_ei_poll
#define __ei_start_xmit ax_ei_start_xmit
#define __ei_tx_timeout ax_ei_tx_timeout
#define __ei_get_stats ax_ei_get_stats
#define __ei_set_multicast_list ax_ei_set_multicast_list
#define __ei_interrupt ax_ei_interrupt
#define ____alloc_ei_netdev ax__alloc_ei_netdev
#define __NS8390_init ax_NS8390_init

/* force unsigned long back to 'void __iomem *' */
#define ax_convert_addr(_a) ((void __force __iomem *)(_a))

#define ei_inb(_a) readb(ax_convert_addr(_a))
#define ei_outb(_v, _a) writeb(_v, ax_convert_addr(_a))

#define ei_inb_p(_a) ei_inb(_a)
#define ei_outb_p(_v, _a) ei_outb(_v, _a)

/* define EI_SHIFT() to take into account our register offsets */
#define EI_SHIFT(x) (ei_local->reg_offset[(x)])

/* Ensure we have our RCR base value */
#define AX88796_PLATFORM

static unsigned char version[] = "ax88796.c: Copyright 2005,2007 Simtec Electronics\n";

#include "lib8390.c"

#define DRV_NAME "ax88796"
#define DRV_VERSION "1.00"

/* from ne.c */
#define NE_CMD		EI_SHIFT(0x00)
#define NE_RESET	EI_SHIFT(0x1f)
#define NE_DATAPORT	EI_SHIFT(0x10)

#define NE1SM_START_PG	0x20	/* First page of TX buffer */
#define NE1SM_STOP_PG	0x40	/* Last page +1 of RX ring */
#define NESM_START_PG	0x40	/* First page of TX buffer */
#define NESM_STOP_PG	0x80	/* Last page +1 of RX ring */

#define AX_GPOC_PPDSET	BIT(6)

/* device private data */

struct ax_device {
	struct mii_bus *mii_bus;
	struct mdiobb_ctrl bb_ctrl;
	struct phy_device *phy_dev;
	void __iomem *addr_memr;
	u8 reg_memr;
	int link;
	int speed;
	int duplex;

	void __iomem *map2;
	const struct ax_plat_data *plat;

	unsigned char running;
	unsigned char resume_open;
	unsigned int irqflags;

	u32 reg_offsets[0x20];
};

static inline struct ax_device *to_ax_dev(struct net_device *dev)
{
	struct ei_device *ei_local = netdev_priv(dev);
	return (struct ax_device *)(ei_local + 1);
}

/*
 * ax_initial_check
 *
 * do an initial probe for the card to check wether it exists
 * and is functional
 */
static int ax_initial_check(struct net_device *dev)
{
	struct ei_device *ei_local = netdev_priv(dev);
	void __iomem *ioaddr = ei_local->mem;
	int reg0;
	int regd;

	reg0 = ei_inb(ioaddr);
	if (reg0 == 0xFF)
		return -ENODEV;

	ei_outb(E8390_NODMA + E8390_PAGE1 + E8390_STOP, ioaddr + E8390_CMD);
	regd = ei_inb(ioaddr + 0x0d);
	ei_outb(0xff, ioaddr + 0x0d);
	ei_outb(E8390_NODMA + E8390_PAGE0, ioaddr + E8390_CMD);
	ei_inb(ioaddr + EN0_COUNTER0); /* Clear the counter by reading. */
	if (ei_inb(ioaddr + EN0_COUNTER0) != 0) {
		ei_outb(reg0, ioaddr);
		ei_outb(regd, ioaddr + 0x0d);	/* Restore the old values. */
		return -ENODEV;
	}

	return 0;
}

/*
 * Hard reset the card. This used to pause for the same period that a
 * 8390 reset command required, but that shouldn't be necessary.
 */
static void ax_reset_8390(struct net_device *dev)
{
	struct ei_device *ei_local = netdev_priv(dev);
	unsigned long reset_start_time = jiffies;
	void __iomem *addr = (void __iomem *)dev->base_addr;

	if (ei_debug > 1)
		netdev_dbg(dev, "resetting the 8390 t=%ld\n", jiffies);

	ei_outb(ei_inb(addr + NE_RESET), addr + NE_RESET);

	ei_local->txing = 0;
	ei_local->dmaing = 0;

	/* This check _should_not_ be necessary, omit eventually. */
	while ((ei_inb(addr + EN0_ISR) & ENISR_RESET) == 0) {
		if (jiffies - reset_start_time > 2 * HZ / 100) {
			netdev_warn(dev, "%s: did not complete.\n", __func__);
			break;
		}
	}

	ei_outb(ENISR_RESET, addr + EN0_ISR);	/* Ack intr. */
}


static void ax_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
			    int ring_page)
{
	struct ei_device *ei_local = netdev_priv(dev);
	void __iomem *nic_base = ei_local->mem;

	/* This *shouldn't* happen. If it does, it's the last thing you'll see */
	if (ei_local->dmaing) {
		netdev_err(dev, "DMAing conflict in %s "
			"[DMAstat:%d][irqlock:%d].\n",
			__func__,
			ei_local->dmaing, ei_local->irqlock);
		return;
	}

	ei_local->dmaing |= 0x01;
	ei_outb(E8390_NODMA + E8390_PAGE0 + E8390_START, nic_base + NE_CMD);
	ei_outb(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
	ei_outb(0, nic_base + EN0_RCNTHI);
	ei_outb(0, nic_base + EN0_RSARLO);		/* On page boundary */
	ei_outb(ring_page, nic_base + EN0_RSARHI);
	ei_outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);

	if (ei_local->word16)
		readsw(nic_base + NE_DATAPORT, hdr,
		       sizeof(struct e8390_pkt_hdr) >> 1);
	else
		readsb(nic_base + NE_DATAPORT, hdr,
		       sizeof(struct e8390_pkt_hdr));