/*
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* Support for ColdFire CPU based boards using a NS8390 Ethernet device.
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*
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* Derived from the many other 8390 drivers.
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*
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* (C) Copyright 2012, Greg Ungerer <gerg@uclinux.org>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of the Linux
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* distribution for more details.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/platform_device.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/jiffies.h>
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#include <linux/io.h>
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#include <asm/mcf8390.h>
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static const char version[] =
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"mcf8390.c: (15-06-2012) Greg Ungerer <gerg@uclinux.org>";
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#define NE_CMD 0x00
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#define NE_DATAPORT 0x10 /* NatSemi-defined port window offset */
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#define NE_RESET 0x1f /* Issue a read to reset ,a write to clear */
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#define NE_EN0_ISR 0x07
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#define NE_EN0_DCFG 0x0e
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#define NE_EN0_RSARLO 0x08
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#define NE_EN0_RSARHI 0x09
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#define NE_EN0_RCNTLO 0x0a
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#define NE_EN0_RXCR 0x0c
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#define NE_EN0_TXCR 0x0d
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#define NE_EN0_RCNTHI 0x0b
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#define NE_EN0_IMR 0x0f
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#define NESM_START_PG 0x40 /* First page of TX buffer */
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#define NESM_STOP_PG 0x80 /* Last page +1 of RX ring */
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#ifdef NE2000_ODDOFFSET
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/*
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* A lot of the ColdFire boards use a separate address region for odd offset
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* register addresses. The following functions convert and map as required.
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* Note that the data port accesses are treated a little differently, and
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* always accessed via the insX/outsX functions.
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*/
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static inline u32 NE_PTR(u32 addr)
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{
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if (addr & 1)
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return addr - 1 + NE2000_ODDOFFSET;
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return addr;
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}
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static inline u32 NE_DATA_PTR(u32 addr)
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{
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return addr;
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}
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void ei_outb(u32 val, u32 addr)
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{
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NE2000_BYTE *rp;
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rp = (NE2000_BYTE *) NE_PTR(addr);
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*rp = RSWAP(val);
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}
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#define ei_inb ei_inb
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u8 ei_inb(u32 addr)
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{
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NE2000_BYTE *rp, val;
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rp = (NE2000_BYTE *) NE_PTR(addr);
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val = *rp;
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return (u8) (RSWAP(val) & 0xff);
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}
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void ei_insb(u32 addr, void *vbuf, int len)
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{
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NE2000_BYTE *rp, val;
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u8 *buf;
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buf = (u8 *) vbuf;
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rp = (NE2000_BYTE *) NE_DATA_PTR(addr);
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for (; (len > 0); len--) {
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val = *rp;
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*buf++ = RSWAP(val);
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}
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}
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void ei_insw(u32 addr, void *vbuf, int len)
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{
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volatile u16 *rp;
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u16 w, *buf;
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buf = (u16 *) vbuf;
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rp = (volatile u16 *) NE_DATA_PTR(addr);
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for (; (len > 0); len--) {
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w = *rp;
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*buf++ = BSWAP(w);
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}
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}
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void ei_outsb(u32 addr, const void *vbuf, int len)
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{
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NE2000_BYTE *rp, val;
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u8 *buf;
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buf = (u8 *) vbuf;
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rp = (NE2000_BYTE *) NE_DATA_PTR(addr);
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for (; (len > 0); len--) {
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val = *buf++;
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*rp = RSWAP(val);
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}
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}
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void ei_outsw(u32 addr, const void *vbuf, int len)
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{
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volatile u16 *rp;
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u16 w, *buf;
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buf = (u16 *) vbuf;
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rp = (volatile u16 *) NE_DATA_PTR(addr);
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for (; (len > 0); len--) {
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w = *buf++;
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*rp = BSWAP(w);
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}
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}
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#else /* !NE2000_ODDOFFSET */
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#define ei_inb inb
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#define ei_outb outb
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#define ei_insb insb
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#define ei_insw insw
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#define ei_outsb outsb
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#define ei_outsw outsw
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#endif /* !NE2000_ODDOFFSET */
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#define ei_inb_p ei_inb
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#define ei_outb_p ei_outb
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#include "lib8390.c"
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/*
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* Hard reset the card. This used to pause for the same period that a
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* 8390 reset command required, but that shouldn't be necessary.
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*/
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static void mcf8390_reset_8390(struct net_device *dev)
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{
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unsigned long reset_start_time = jiffies;
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u32 addr = dev->base_addr;
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struct ei_device *ei_local = netdev_priv(dev);
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netif_dbg(ei_local, hw, dev, "resetting the 8390 t=%ld...\n", jiffies);
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ei_outb(ei_inb(addr + NE_RESET), addr + NE_RESET);
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ei_status.txing = 0;
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ei_status.dmaing = 0;
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/* This check _should_not_ be necessary, omit eventually. */
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while ((ei_inb(addr + NE_EN0_ISR) & ENISR_RESET) == 0) {
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if (time_after(jiffies, reset_start_time + 2 * HZ / 100)) {
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netdev_warn(dev, "%s: did not complete\n", __func__);
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break;
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}
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}
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ei_outb(ENISR_RESET, addr + NE_EN0_ISR);
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}
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/*
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* This *shouldn't* happen.
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* If it does, it's the last thing you'll see
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*/
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static void mcf8390_dmaing_err(const char *func, struct net_device *dev,
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struct ei_device *ei_local)
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{
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netdev_err(dev, "%s: DMAing conflict [DMAstat:%d][irqlock:%d]\n",
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func, ei_local->dmaing, ei_local->irqlock);
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}
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/*
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* Grab the 8390 specific header. Similar to the block_input routine, but
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* we don't need to be concerned with ring wrap as the header will be at
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* the start of a page, so we optimize accordingly.
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*/
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static void mcf8390_get_8390_hdr(struct net_device *dev,
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struct e8390_pkt_hdr *hdr, int ring_page)
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{
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struct ei_device *ei_local = netdev_priv(dev);
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u32 addr = dev->base_addr;
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if (ei_local->dmaing) {
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mcf8390_dmaing_err(__func__, dev, ei_local);
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return;
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}
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ei_local->dmaing |= 0x01;
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ei_outb(E8390_NODMA + E8390_PAGE0 + E8390_START, addr + NE_CMD);
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ei_outb(ENISR_RDC, addr + NE_EN0_ISR);
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ei_outb(sizeof(struct e8390_pkt_hdr), addr + NE_EN0_RCNTLO);
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ei_outb(0, addr + NE_EN0_RCNTHI);
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ei_outb(0, addr + NE_EN0_RSARLO); /* On page boundary */
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ei_outb(ring_page, addr + NE_EN0_RSARHI);
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ei_outb(E8390_RREAD + E8390_START, addr + NE_CMD);
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ei_insw(addr + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr) >> 1);
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outb(ENISR_RDC, addr + NE_EN0_ISR); /* Ack intr */
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ei_local->dmaing &= ~0x01;
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hdr->count = cpu_to_le16(hdr->count);
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}
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/*
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* Block input and output, similar to the Crynwr packet driver.
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* If you are porting to a new ethercard, look at the packet driver source
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* for hints. The NEx000 doesn't share the on-board packet memory --
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* you have to put the packet out through the "remote DMA" dataport
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* using z_writeb.
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*/
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static void mcf8390_block_input(struct net_device *dev, int count,
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struct sk_buff *skb, int ring_offset)
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{
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struct ei_device *ei_local = netdev_priv(dev);
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u32 addr = dev->base_addr;
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char *buf = skb->data;
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if (ei_local->dmaing) {
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mcf8390_dmaing_err(__func__, dev, ei_local);
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return;
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}
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ei_local->dmaing |= 0x01;
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ei_outb(E8390_NODMA + E8390_PAGE0 + E8390_START, addr + NE_CMD);
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ei_outb(ENISR_RDC, addr + NE_EN0_ISR);
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ei_outb(count & 0xff, addr + NE_EN0_RCNTLO);
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ei_outb(count >> 8, addr + NE_EN0_RCNTHI);
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ei_outb(ring_offset & 0xff, addr + NE_EN0_RSARLO);
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ei_outb(ring_offset >> 8, addr + NE_EN0_RSARHI);
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ei_outb(E8390_RREAD + E8390_START, addr + NE_CMD);
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ei_insw(addr + NE_DATAPORT, buf, count >> 1);
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if (count & 1)
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buf[count - 1] = ei_inb(addr + NE_DATAPORT);
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ei_outb(ENISR_RDC, addr + NE_EN0_ISR); /* Ack intr */
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ei_local->dmaing &= ~0x01;
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}
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static void mcf8390_block_output(struct net_device *dev, int count,
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const unsigned char *buf,
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const int start_page)
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{
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struct ei_device *ei_local = netdev_priv(dev);
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u32 addr = dev->base_addr;
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unsigned long dma_start;
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/* Make sure we transfer all bytes if 16bit IO writes */
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if (count & 0x1)
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count++;
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if (ei_local->dmaing) {
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mcf8390_dmaing_err(__func__, dev, ei_local);
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return;
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}
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ei_local->dmaing |= 0x01;
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/* We should already be in page 0, but to be safe... */
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ei_outb(E8390_PAGE0 + E8390_START + E8390_NODMA, addr + NE_CMD);
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ei_outb(ENISR_RDC, addr + NE_EN0_ISR);
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/* Now the normal output. */
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ei_outb(count & 0xff, addr + NE_EN0_RCNTLO);
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ei_outb(count >> 8, addr + NE_EN0_RCNTHI);
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ei_outb(0x00, addr + NE_EN0_RSARLO);
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ei_outb(start_page, addr + NE_EN0_RSARHI);
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ei_outb(E8390_RWRITE + E8390_START, addr + NE_CMD);
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ei_outsw(addr + NE_DATAPORT, buf, count >> 1);
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dma_start = jiffies;
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while ((ei_inb(addr + NE_EN0_ISR) & ENISR_RDC) == 0) {
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if (time_after(jiffies, dma_start + 2 * HZ / 100)) { /* 20ms */
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netdev_warn(dev, "timeout waiting for Tx RDC\n");
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mcf8390_reset_8390(dev);
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__NS8390_init(dev, 1);
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break;
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}
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}
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ei_outb(ENISR_RDC, addr + NE_EN0_ISR); /* Ack intr */
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ei_local->dmaing &= ~0x01;
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}
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static const struct net_device_ops mcf8390_netdev_ops = {
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.ndo_open = __ei_open,
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.ndo_stop = __ei_close,
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.ndo_start_xmit = __ei_start_xmit,
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.ndo_tx_timeout = __ei_tx_timeout,
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.ndo_get_stats = __ei_get_stats,
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.ndo_set_rx_mode = __ei_set_multicast_list,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_set_mac_address = eth_mac_addr,
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_poll_controller = __ei_poll,
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#endif
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};
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static int mcf8390_init(struct net_device *dev)
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{
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static u32 offsets[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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};
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struct ei_device *ei_local = netdev_priv(dev);
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unsigned char SA_prom[32];
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u32 addr = dev->base_addr;
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int start_page, stop_page;
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int i, ret;
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mcf8390_reset_8390(dev);
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/*
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* Read the 16 bytes of station address PROM.
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* We must first initialize registers,
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* similar to NS8390_init(eifdev, 0).
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* We can't reliably read the SAPROM address without this.
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* (I learned the hard way!).
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*/
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{
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static const struct {
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u32 value;
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u32 offset;
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} program_seq[] = {
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{E8390_NODMA + E8390_PAGE0 + E8390_STOP, NE_CMD},
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/* Select page 0 */
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{0x48, NE_EN0_DCFG}, /* 0x48: Set byte-wide access */
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{0x00, NE_EN0_RCNTLO}, /* Clear the count regs */
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{0x00, NE_EN0_RCNTHI},
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{0x00, NE_EN0_IMR}, /* Mask completion irq */
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{0xFF, NE_EN0_ISR},
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{E8390_RXOFF, NE_EN0_RXCR}, /* 0x20 Set to monitor */
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{E8390_TXOFF, NE_EN0_TXCR}, /* 0x02 and loopback mode */
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{32, NE_EN0_RCNTLO},
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{0x00, NE_EN0_RCNTHI},
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{0x00, NE_EN0_RSARLO}, /* DMA starting at 0x0000 */
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{0x00, NE_EN0_RSARHI},
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{E8390_RREAD + E8390_START, NE_CMD},
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};
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for (i = 0; i < ARRAY_SIZE(program_seq); i++) {
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ei_outb(program_seq[i].value,
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addr + program_seq[i].offset);
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}
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}
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for (i = 0; i < 16; i++) {
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SA_prom[i] = ei_inb(addr + NE_DATAPORT);
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ei_inb(addr + NE_DATAPORT);
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}
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/* We must set the 8390 for word mode. */
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ei_outb(0x49, addr + NE_EN0_DCFG);
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start_page = NESM_START_PG;
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stop_page = NESM_STOP_PG;
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/* Install the Interrupt handler */
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ret = request_irq(dev->irq, __ei_interrupt, 0, dev->name, dev);
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if (ret)
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return ret;
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for (i = 0; i < ETH_ALEN; i++)
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dev->dev_addr[i] = SA_prom[i];
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netdev_dbg(dev, "Found ethernet address: %pM\n", dev->dev_addr);
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ei_local->name = "mcf8390";
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ei_local->tx_start_page = start_page;
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ei_local->stop_page = stop_page;
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ei_local->word16 = 1;
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ei_local->rx_start_page = start_page + TX_PAGES;
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ei_local->reset_8390 = mcf8390_reset_8390;
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ei_local->block_input = mcf8390_block_input;
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ei_local->block_output = mcf8390_block_output;
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ei_local->get_8390_hdr = mcf8390_get_8390_hdr;
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ei_local->reg_offset = offsets;
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dev->netdev_ops = &mcf8390_netdev_ops;
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__NS8390_init(dev, 0);
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ret = register_netdev(dev);
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if (ret) {
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free_irq(dev->irq, dev);
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return ret;
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}
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netdev_info(dev, "addr=0x%08x irq=%d, Ethernet Address %pM\n",
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addr, dev->irq, dev->dev_addr);
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return 0;
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}
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static int mcf8390_probe(struct platform_device *pdev)
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{
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struct net_device *dev;
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struct resource *mem;
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resource_size_t msize;
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int ret, irq;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "no IRQ specified?\n");
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return -ENXIO;
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}
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (mem == NULL) {
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dev_err(&pdev->dev, "no memory address specified?\n");
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return -ENXIO;
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}
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msize = resource_size(mem);
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if (!request_mem_region(mem->start, msize, pdev->name))
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return -EBUSY;
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dev = ____alloc_ei_netdev(0);
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if (dev == NULL) {
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release_mem_region(mem->start, msize);
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return -ENOMEM;
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}
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SET_NETDEV_DEV(dev, &pdev->dev);
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platform_set_drvdata(pdev, dev);
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dev->irq = irq;
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dev->base_addr = mem->start;
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ret = mcf8390_init(dev);
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if (ret) {
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release_mem_region(mem->start, msize);
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free_netdev(dev);
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return ret;
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}
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return 0;
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}
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static int mcf8390_remove(struct platform_device *pdev)
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{
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struct net_device *dev = platform_get_drvdata(pdev);
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struct resource *mem;
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unregister_netdev(dev);
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (mem)
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release_mem_region(mem->start, resource_size(mem));
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free_netdev(dev);
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return 0;
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}
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static struct platform_driver mcf8390_drv = {
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.driver = {
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.name = "mcf8390",
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},
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.probe = mcf8390_probe,
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.remove = mcf8390_remove,
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};
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module_platform_driver(mcf8390_drv);
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MODULE_DESCRIPTION("MCF8390 ColdFire NS8390 driver");
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MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:mcf8390");
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