path: root/drivers/net/gt96100eth.c

/*
 * Copyright 2000, 2001 MontaVista Software Inc.
 * Author: MontaVista Software, Inc.
 *         	stevel@mvista.com or source@mvista.com
 *
 *  This program is free software; you can distribute 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 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.
 *
 * Ethernet driver for the MIPS GT96100 Advanced Communication Controller.
 * 
 *  Revision history
 *    
 *    11.11.2001  Moved to 2.4.14, ppopov@mvista.com.  Modified driver to add
 *                proper gt96100A support.
 *    12.05.2001  Moved eth port 0 to irq 3 (mapped to GT_SERINT0 on EV96100A)
 *                in order for both ports to work. Also cleaned up boot
 *                option support (mac address string parsing), fleshed out
 *                gt96100_cleanup_module(), and other general code cleanups
 *                <stevel@mvista.com>.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/bitops.h>

#include <asm/irq.h>
#include <asm/io.h>

#define DESC_BE 1
#define DESC_DATA_BE 1

#define GT96100_DEBUG 2

#include "gt96100eth.h"

// prototypes
static void* dmaalloc(size_t size, dma_addr_t *dma_handle);
static void dmafree(size_t size, void *vaddr);
static void gt96100_delay(int msec);
static int gt96100_add_hash_entry(struct net_device *dev,
				  unsigned char* addr);
static void read_mib_counters(struct gt96100_private *gp);
static int read_MII(int phy_addr, u32 reg);
static int write_MII(int phy_addr, u32 reg, u16 data);
static int gt96100_init_module(void);
static void gt96100_cleanup_module(void);
static void dump_MII(int dbg_lvl, struct net_device *dev);
static void dump_tx_desc(int dbg_lvl, struct net_device *dev, int i);
static void dump_rx_desc(int dbg_lvl, struct net_device *dev, int i);
static void dump_skb(int dbg_lvl, struct net_device *dev,
		     struct sk_buff *skb);
static void update_stats(struct gt96100_private *gp);
static void abort(struct net_device *dev, u32 abort_bits);
static void hard_stop(struct net_device *dev);
static void enable_ether_irq(struct net_device *dev);
static void disable_ether_irq(struct net_device *dev);
static int gt96100_probe1(struct pci_dev *pci, int port_num);
static void reset_tx(struct net_device *dev);
static void reset_rx(struct net_device *dev);
static int gt96100_check_tx_consistent(struct gt96100_private *gp);
static int gt96100_init(struct net_device *dev);
static int gt96100_open(struct net_device *dev);
static int gt96100_close(struct net_device *dev);
static int gt96100_tx(struct sk_buff *skb, struct net_device *dev);
static int gt96100_rx(struct net_device *dev, u32 status);
static irqreturn_t gt96100_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static void gt96100_tx_timeout(struct net_device *dev);
static void gt96100_set_rx_mode(struct net_device *dev);
static struct net_device_stats* gt96100_get_stats(struct net_device *dev);

extern char * __init prom_getcmdline(void);

static int max_interrupt_work = 32;

#define nibswap(x) ((((x) >> 4) & 0x0f) | (((x) << 4) & 0xf0))

#define RUN_AT(x) (jiffies + (x))

// For reading/writing 32-bit words and half-words from/to DMA memory
#ifdef DESC_BE
#define cpu_to_dma32 cpu_to_be32
#define dma32_to_cpu be32_to_cpu
#define cpu_to_dma16 cpu_to_be16
#define dma16_to_cpu be16_to_cpu
#else
#define cpu_to_dma32 cpu_to_le32
#define dma32_to_cpu le32_to_cpu
#define cpu_to_dma16 cpu_to_le16
#define dma16_to_cpu le16_to_cpu
#endif

static char mac0[18] = "00.02.03.04.05.06";
static char mac1[18] = "00.01.02.03.04.05";
module_param_string(mac0, mac0, 18, 0);
module_param_string(mac1, mac0, 18, 0);
MODULE_PARM_DESC(mac0, "MAC address for GT96100 ethernet port 0");
MODULE_PARM_DESC(mac1, "MAC address for GT96100 ethernet port 1");

/*
 * Info for the GT96100 ethernet controller's ports.
 */
static struct gt96100_if_t {
	struct net_device *dev;
	unsigned int  iobase;   // IO Base address of this port
	int           irq;      // IRQ number of this port
	char         *mac_str;
} gt96100_iflist[NUM_INTERFACES] = {
	{
		NULL,
		GT96100_ETH0_BASE, GT96100_ETHER0_IRQ,
		mac0
	},
	{
		NULL,
		GT96100_ETH1_BASE, GT96100_ETHER1_IRQ,
		mac1
	}
};

static inline const char*
chip_name(int chip_rev)
{
	switch (chip_rev) {
	case REV_GT96100:
		return "GT96100";
	case REV_GT96100A_1:
	case REV_GT96100A:
		return "GT96100A";
	default:
		return "Unknown GT96100";
	}
}

/*
  DMA memory allocation, derived from pci_alloc_consistent.
*/
static void * dmaalloc(size_t size, dma_addr_t *dma_handle)
{
	void *ret;
	
	ret = (void *)__get_free_pages(GFP_ATOMIC | GFP_DMA, get_order(size));
	
	if (ret != NULL) {
		dma_cache_inv((unsigned long)ret, size);
		if (dma_handle != NULL)
			*dma_handle = virt_to_phys(ret);

		/* bump virtual address up to non-cached area */
		ret = (void*)KSEG1ADDR(ret);
	}

	return ret;
}

static void dmafree(size_t size, void *vaddr)
{
	vaddr = (void*)KSEG0ADDR(vaddr);
	free_pages((unsigned long)vaddr, get_order(size));
}

static void gt96100_delay(int ms)
{
	if (in_interrupt())
		return;
	else
		msleep_interruptible(ms);
}

static int
parse_mac_addr(struct net_device *dev, char* macstr)
{
	int i, j;
	unsigned char result, value;
	
	for (i=0; i<6; i++) {
		result = 0;
		if (i != 5 && *(macstr+2) != '.') {
			err(__FILE__ "invalid mac addres