/*
* Driver for the Macintosh 68K onboard MACE controller with PSC
* driven DMA. The MACE driver code is derived from mace.c. The
* Mac68k theory of operation is courtesy of the MacBSD wizards.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Copyright (C) 1996 Paul Mackerras.
* Copyright (C) 1998 Alan Cox <alan@redhat.com>
*
* Modified heavily by Joshua M. Thompson based on Dave Huang's NetBSD driver
*
* Copyright (C) 2007 Finn Thain
*
* Converted to DMA API, converted to unified driver model,
* sync'd some routines with mace.c and fixed various bugs.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/crc32.h>
#include <linux/bitrev.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_psc.h>
#include <asm/page.h>
#include "mace.h"
static char mac_mace_string[] = "macmace";
static struct platform_device *mac_mace_device;
#define N_TX_BUFF_ORDER 0
#define N_TX_RING (1 << N_TX_BUFF_ORDER)
#define N_RX_BUFF_ORDER 3
#define N_RX_RING (1 << N_RX_BUFF_ORDER)
#define TX_TIMEOUT HZ
#define MACE_BUFF_SIZE 0x800
/* Chip rev needs workaround on HW & multicast addr change */
#define BROKEN_ADDRCHG_REV 0x0941
/* The MACE is simply wired down on a Mac68K box */
#define MACE_BASE (void *)(0x50F1C000)
#define MACE_PROM (void *)(0x50F08001)
struct mace_data {
volatile struct mace *mace;
unsigned char *tx_ring;
dma_addr_t tx_ring_phys;
unsigned char *rx_ring;
dma_addr_t rx_ring_phys;
int dma_intr;
int rx_slot, rx_tail;
int tx_slot, tx_sloti, tx_count;
int chipid;
struct device *device;
};
struct mace_frame {
u8 rcvcnt;
u8 pad1;
u8 rcvsts;
u8 pad2;
u8 rntpc;
u8 pad3;
u8 rcvcc;
u8 pad4;
u32 pad5;
u32 pad6;
u8 data[1];
/* And frame continues.. */
};
#define PRIV_BYTES sizeof(struct mace_data)
static int mace_open(struct net_device *dev);
static int mace_close(struct net_device *dev);
static int mace_xmit_start(struct sk_buff *skb, struct net_device *dev);
static void mace_set_multicast(struct net_device *dev);
static int mace_set_address(struct net_device *dev, void *addr);
static void mace_reset(struct net_device *dev);
static irqreturn_t mace_interrupt(int irq, void *dev_id);
static irqreturn_t mace_dma_intr(int irq, void *dev_id);
static void mace_tx_timeout(struct net_device *dev);
static void __mace_set_address(struct net_device *dev, void *addr);
/*
* Load a receive DMA channel with a base address and ring length
*/
static void mace_load_rxdma_base(struct net_device *dev, int set)
{
struct mace_data *mp = netdev_priv(dev);
psc_write_word(PSC_ENETRD_CMD + set, 0x0100);
psc_write_long(PSC_ENETRD_ADDR + set, (u32) mp->rx_ring_phys);
psc_write_long(PSC_ENETRD_LEN + set, N_RX_RING);
psc_write_word(PSC_ENETRD_CMD + set, 0x9800);
mp->rx_tail = 0;
}
/*
* Reset the receive DMA subsystem
*/
static void mace_rxdma_reset(struct net_device *dev)
{
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mace = mp->mace;
u8 maccc = mace->maccc;
mace->maccc = maccc & ~ENRCV;
psc_write_word(PSC_ENETRD_CTL, 0x8800);
mace_load_rxdma_base(dev, 0x00);
psc_write_word(PSC_ENETRD_CTL, 0x0400);
psc_write_word(PSC_ENETRD_CTL, 0x8800);
mace_load_rxdma_base(dev, 0x10);
psc_write_word(PSC_ENETRD_CTL, 0x0400);
mace->maccc = maccc;
mp->rx_slot = 0;
psc_write_word(PSC_ENETRD_CMD + PSC_SET0, 0x9800);
psc_write_word(PSC_ENETRD_CMD + PSC_SET1, 0x9800);
}
/*
* Reset the transmit DMA subsystem
*/
static void mace_txdma_reset(struct net_device *dev)
{
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mace = mp->mace;
u8 maccc;
psc_write_word(PSC_ENETWR_CTL, 0x8800);
maccc = mace->maccc;
mace->maccc = maccc & ~ENXMT;
mp->tx_slot = mp->tx_sloti = 0;
mp->tx_count = N_TX_RING;
psc_write_word(PSC_ENETWR_CTL, 0x0400);
mace->maccc = maccc;
}
/*
* Disable DMA
*/
static void mace_dma_off(struct net_device *dev)
{
psc_write_word(PSC_ENETRD_CTL, 0x8800);
psc_write_word(PSC_ENETRD_CTL, 0x1000);
psc_write_word(PSC_ENETRD_CMD + PSC_SET0, 0x1100);
psc_write_word(PSC_ENETRD_CMD + PSC_SET1, 0x1100);
psc_write_word(PSC_ENETWR_CTL, 0x8800);
psc_write_word(PSC_ENETWR_CTL, 0x1000);
psc_write_word(PSC_ENETWR_CMD + PSC_SET0, 0x1100);
psc_write_word(PSC_ENETWR_CMD + PSC_SET1, 0x1100);
}
/*
* Not really much of a probe. The hardware table tells us if this
* model of Macintrash has a MACE (AV macintoshes)
*/
static int __devinit mace_probe(struct platform_device *pdev)
{
int j;
struct mace_data *mp;
unsigned char *addr;
struct net_device *dev;
unsigned char checksum = 0;
static int found = 0;
int err;
if (found || macintosh_config->ether_type != MAC_ETHER_MACE)
return -ENODEV;
found = 1; /* prevent 'finding' one on every device probe */
dev = alloc_etherdev(PRIV_BYTES);
if (!dev)
return -ENOMEM;
mp = netdev_priv(dev);
mp->device = &pdev->dev;
SET_NETDEV_DEV(dev, &pdev->dev);
dev->base_addr = (u32)MACE_BASE;
mp->mace = (volatile struct mace *) MACE_BASE;
dev->irq = IRQ_MAC_MACE;
mp->dma_intr = IRQ_MAC_MACE_DMA;
mp->chipid = mp->mace->chipid_hi << 8 | mp->mace->chipid_lo;
/*
* The PROM contains 8 bytes which total 0xFF when XOR'd
* together. Due to the usual peculiar apple brain damage
* the bytes are spaced out in a strange boundary and the
* bits are reversed.
*/
addr = (void *)MACE_PROM;
for (j = 0; j < 6; ++j) {
u8 v = bitrev8(addr[j<<4]);
checksum ^= v;
dev->dev_addr[j] = v;
}
for (; j < 8; ++j) {
checksum ^= bitrev8(addr[j<<4]);
}
if (checksum != 0xFF) {
free_netdev(dev);
return -ENODEV;
}
dev->open = mace_open;
dev->stop = mace_close;
dev->hard_start_xmit = mace_xmit_start;
dev->tx_timeout = mace_tx_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
dev->set_multicast_list = mace_set_multicast;
dev->set_mac_address = mace_set_address;
printk(KERN_INFO "%s: 68K MACE, hardware address %.2X", dev->name, dev->dev_addr[0]);
for (j = 1 ; j < 6 ; j++) printk(":%.2X", dev->dev_addr[j]);
printk("\n");
err = register_netdev(dev);
if (!err)
return 0;
free_netdev(dev);
return err;
}
/*
* Reset the chip.
*/
static void mace_reset(struct net_device *dev)
{
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mb = mp->mace;
int i;
/* soft-reset the chip */
i = 200;
while (--i) {
mb->biucc = SWRST;
if (mb->biucc & SWRST) {
udelay(10);
continue;
}
break;
}
if (!i) {
printk(KERN_ERR "macmace: cannot reset chip!\n");
return;
}
mb->maccc = 0; /* turn off tx, rx */
mb->imr = 0xFF; /* disable all intrs for now */
i = mb->ir;
mb->biucc = XMTSP_64;
mb->utr = RTRD;
mb->fifocc = XMTFW_8 | RCVFW_64 | XMTFWU | RCVFWU;
mb->xmtfc = AUTO_PAD_XMIT; /* auto-pad short frames */
mb->rcvfc = 0;
/* load up the hardware address */
__mace_set_address(dev, dev->dev_addr);
/* clear the multicast filter */
if (mp->chipid == BROKEN_ADDRCHG_REV)
mb->iac = LOGADDR;
else {
mb->iac = ADDRCHG | LOGADDR;
while ((mb->iac & ADDRCHG) != 0)
;
}
for (i = 0; i < 8; ++i)
mb->ladrf = 0;
/* done changing address */
if (mp->chipid != BROKEN_ADDRCHG_REV)
mb->iac = 0;
mb->plscc = PORTSEL_AUI;
}
/*
* Load the address on a mace controller.
*/
static void __mace_set_address(struct net_device *dev, void *addr)
{
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mb = mp->mace;
unsigned char *p = addr;
int i;
/* load up the hardware address */
if (mp->chipid == BROKEN_ADDRCHG_REV)
mb->iac = PHYADDR;
else {
mb->iac = ADDRCHG | PHYADDR;
while ((mb->iac & ADDRCHG) != 0)
;
}
for (i = 0; i < 6; ++i)
mb->padr = dev->dev_addr[i] = p[i];
if (mp->chipid != BROKEN_ADDRCHG_REV)
mb->iac = 0;
}
static int mace_set_address(struct net_device *dev, void *addr)
{
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mb = mp->mace;
unsigned long flags;
u8 maccc;
local_irq_save(flags);
maccc = mb->maccc;
__mace_set_address(dev, addr);
mb->maccc = maccc;
local_irq_restore(flags);
return 0;
}
/*
* Open the Macintosh MACE. Most of this is playing with the DMA
* engine. The ethernet chip is quite friendly.
*/
static int mace_open(struct net_device *dev)
{
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mb = mp->mace;
/* reset the chip */
mace_reset(dev);
if (request_irq(dev->irq, mace_interrupt, 0, dev->name, dev)) {
printk(KERN_ERR "%s: can't get irq %d\n", dev->name, dev->irq);
return -EAGAIN;
}
if (request_irq(mp->dma_intr, mace_dma_intr, 0, dev->name, dev)) {
printk(KERN_ERR "%s: can't get irq %d\n", dev->name, mp->dma_intr);
free_irq(dev->irq, dev);
return -EAGAIN;
}
/* Allocate the DMA ring buffers */
mp->tx_ring = dma_alloc_coherent(mp->device,
N_TX_RING * MACE_BUFF_SIZE,
&mp->tx_ring_phys, GFP_KERNEL);
if (mp->tx_ring == NULL) {
printk(KERN_ERR "%s: unable to allocate DMA tx buffers\n", dev->name);
goto out1;
}
mp->rx_ring = dma_alloc_coherent(mp->device,
N_RX_RING * MACE_BUFF_SIZE,
&mp->rx_ring_phys, GFP_KERNEL);
if (mp->rx_ring == NULL) {
printk(KERN_ERR "%s: unable to allocate DMA rx buffers\n", dev->name);
goto out2;
}
mace_dma_off(dev);
/* Not sure what these do */
psc_write_word(PSC_ENETWR_CTL, 0x9000);
psc_write_word(PSC_ENETRD_CTL, 0x9000);
psc_write_word(PSC_ENETWR_CTL, 0x0400);
psc_write_word(PSC_ENETRD_CTL, 0x0400);
mace_rxdma_reset(dev);
mace_txdma_reset(dev);
/* turn it on! */
mb->maccc = ENXMT | ENRCV;
/* enable all interrupts except receive interrupts */
mb->imr = RCVINT;
return 0;
out2:
dma_free_coherent(mp->device, N_TX_RING * MACE_BUFF_SIZE,
mp->tx_ring, mp->tx_ring_phys);
out1:
free_irq(dev->irq, dev);
free_irq(mp->dma_intr, dev);
return -ENOMEM;
}
/*
* Shut down the mace and its interrupt channel
*/
static int mace_close(struct net_device *dev)
{
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mb = mp->mace;
mb->maccc = 0; /* disable rx and tx */
mb->imr = 0xFF; /* disable all irqs */
mace_dma_off(dev); /* disable rx and tx dma */
return 0;
}
/*
* Transmit a frame
*/
static int mace_xmit_start(struct sk_buff *skb, struct net_device *dev)
{
struct mace_data *mp = netdev_priv(dev);
unsigned long flags;
/* Stop the queue since there's only the one buffer */
local_irq_save(flags);
netif_stop_queue(dev);
if (!mp->tx_count) {
printk(KERN_ERR "macmace: tx queue running but no free buffers.\n");
local_irq_restore(flags);
return NETDEV_TX_BUSY;
}
mp->tx_count--;
local_irq_restore(flags);
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
/* We need to copy into our xmit buffer to take care of alignment and caching issues */
skb_copy_from_linear_data(skb, mp->tx_ring, skb->len);
/* load the Tx DMA and fire it off */
psc_write_long(PSC_ENETWR_ADDR + mp->tx_slot, (u32) mp->tx_ring_phys);
psc_write_long(PSC_ENETWR_LEN + mp->tx_slot, skb->len);
psc_write_word(PSC_ENETWR_CMD + mp->tx_slot, 0x9800);
mp->tx_slot ^= 0x10;
dev_kfree_skb(skb);
dev->trans_start = jiffies;
return NETDEV_TX_OK;
}
static void mace_set_multicast(struct net_device *dev)
{
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mb = mp->mace;
int i, j;
u32 crc;
u8 maccc;
unsigned long flags;
local_irq_save(flags);
maccc = mb->maccc;
mb->maccc &= ~PROM;
if (dev->flags & IFF_PROMISC) {
mb->maccc |= PROM;
} else {
unsigned char multicast_filter[8];
struct dev_mc_list *dmi = dev->mc_list;
if (dev->flags & IFF_ALLMULTI) {
for (i = 0; i < 8; i++) {
multicast_filter[i] = 0xFF;
}
} else {
for (i = 0; i < 8; i++)
multicast_filter[i] = 0;
for (i = 0; i < dev->mc_count; i++) {
crc = ether_crc_le(6, dmi->dmi_addr);
j = crc >> 26; /* bit number in multicast_filter */
multicast_filter[j >> 3] |= 1 << (j & 7);
dmi = dmi->next;
}
}
if (mp->chipid == BROKEN_ADDRCHG_REV)
mb->iac = LOGADDR;
else {
mb->iac = ADDRCHG | LOGADDR;
while ((mb->iac & ADDRCHG) != 0)
;
}
for (i = 0; i < 8; ++i)
mb->ladrf = multicast_filter[i];
if (mp->chipid != BROKEN_ADDRCHG_REV)
mb->iac = 0;
}
mb->maccc = maccc;
local_irq_restore(flags);
}
static void mace_handle_misc_intrs(struct mace_data *mp, int intr)
{
volatile struct mace *mb = mp->mace;
static int mace_babbles, mace_jabbers;
if (intr & MPCO)
dev->stats.rx_missed_errors += 256;
dev->stats.rx_missed_errors += mb->mpc; /* reading clears it */
if (intr & RNTPCO)
dev->stats.rx_length_errors += 256;
dev->stats.rx_length_errors += mb->rntpc; /* reading clears it */
if (intr & CERR)
++dev->stats.tx_heartbeat_errors;
if (intr & BABBLE)
if (mace_babbles++ < 4)
printk(KERN_DEBUG "macmace: babbling transmitter\n");
if (intr & JABBER)
if (mace_jabbers++ < 4)
printk(KERN_DEBUG "macmace: jabbering transceiver\n");
}
static irqreturn_t mace_interrupt(int irq, void *dev_id)
{
struct net_device *dev = (struct net_device *) dev_id;
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mb = mp->mace;
int intr, fs;
unsigned long flags;
/* don't want the dma interrupt handler to fire */
local_irq_save(flags);
intr = mb->ir; /* read interrupt register */
mace_handle_misc_intrs(mp, intr);
if (intr & XMTINT) {
fs = mb->xmtfs;
if ((fs & XMTSV) == 0) {
printk(KERN_ERR "macmace: xmtfs not valid! (fs=%x)\n", fs);
mace_reset(dev);
/*
* XXX mace likes to hang the machine after a xmtfs error.
* This is hard to reproduce, reseting *may* help
*/
}
/* dma should have finished */
if (!mp->tx_count) {
printk(KERN_DEBUG "macmace: tx ring ran out? (fs=%x)\n", fs);
}
/* Update stats */
if (fs & (UFLO|LCOL|LCAR|RTRY)) {
++dev->stats.tx_errors;
if (fs & LCAR)
++dev->stats.tx_carrier_errors;
else if (fs & (UFLO|LCOL|RTRY)) {
++dev->stats.tx_aborted_errors;
if (mb->xmtfs & UFLO) {
printk(KERN_ERR "%s: DMA underrun.\n", dev->name);
dev->stats.tx_fifo_errors++;
mace_txdma_reset(dev);
}
}
}
}
if (mp->tx_count)
netif_wake_queue(dev);
local_irq_restore(flags);
return IRQ_HANDLED;
}
static void mace_tx_timeout(struct net_device *dev)
{
struct mace_data *mp = netdev_priv(dev);
volatile struct mace *mb = mp->mace;
unsigned long flags;
local_irq_save(flags);
/* turn off both tx and rx and reset the chip */
mb->maccc = 0;
printk(KERN_ERR "macmace: transmit timeout - resetting\n");
mace_txdma_reset(dev);
mace_reset(dev);
/* restart rx dma */
mace_rxdma_reset(dev);
mp->tx_count = N_TX_RING;
netif_wake_queue(dev);
/* turn it on! */
mb->maccc = ENXMT | ENRCV;
/* enable all interrupts except receive interrupts */
mb->imr = RCVINT;
local_irq_restore(flags);
}
/*
* Handle a newly arrived frame
*/
static void mace_dma_rx_frame(struct net_device *dev, struct mace_frame *mf)
{
struct mace_data *mp = netdev_priv(dev);
struct sk_buff *skb;
unsigned int frame_status = mf->rcvsts;
if (frame_status & (RS_OFLO | RS_CLSN | RS_FRAMERR | RS_FCSERR)) {
dev->stats.rx_errors++;
if (frame_status & RS_OFLO) {
printk(KERN_DEBUG "%s: fifo overflow.\n", dev->name);
dev->stats.rx_fifo_errors++;
}
if (frame_status & RS_CLSN)
dev->stats.collisions++;
if (frame_status & RS_FRAMERR)
dev->stats.rx_frame_errors++;
if (frame_status & RS_FCSERR)
dev->stats.rx_crc_errors++;
} else {
unsigned int frame_length = mf->rcvcnt + ((frame_status & 0x0F) << 8 );
skb = dev_alloc_skb(frame_length + 2);
if (!skb) {
dev->stats.rx_dropped++;
return;
}
skb_reserve(skb, 2);
memcpy(skb_put(skb, frame_length), mf->data, frame_length);
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
dev->last_rx = jiffies;
dev->stats.rx_packets++;
dev->stats.rx_bytes += frame_length;
}
}
/*
* The PSC has passed us a DMA interrupt event.
*/
static irqreturn_t mace_dma_intr(int irq, void *dev_id)
{
struct net_device *dev = (struct net_device *) dev_id;
struct mace_data *mp = netdev_priv(dev);
int left, head;
u16 status;
u32 baka;
/* Not sure what this does */
while ((baka = psc_read_long(PSC_MYSTERY)) != psc_read_long(PSC_MYSTERY));
if (!(baka & 0x60000000)) return IRQ_NONE;
/*
* Process the read queue
*/
status = psc_read_word(PSC_ENETRD_CTL);
if (status & 0x2000) {
mace_rxdma_reset(dev);
} else if (status & 0x0100) {
psc_write_word(PSC_ENETRD_CMD + mp->rx_slot, 0x1100);
left = psc_read_long(PSC_ENETRD_LEN + mp->rx_slot);
head = N_RX_RING - left;
/* Loop through the ring buffer and process new packages */
while (mp->rx_tail < head) {
mace_dma_rx_frame(dev, (struct mace_frame*) (mp->rx_ring
+ (mp->rx_tail * MACE_BUFF_SIZE)));
mp->rx_tail++;
}
/* If we're out of buffers in this ring then switch to */
/* the other set, otherwise just reactivate this one. */
if (!left) {
mace_load_rxdma_base(dev, mp->rx_slot);
mp->rx_slot ^= 0x10;
} else {
psc_write_word(PSC_ENETRD_CMD + mp->rx_slot, 0x9800);
}
}
/*
* Process the write queue
*/
status = psc_read_word(PSC_ENETWR_CTL);
if (status & 0x2000) {
mace_txdma_reset(dev);
} else if (status & 0x0100) {
psc_write_word(PSC_ENETWR_CMD + mp->tx_sloti, 0x0100);
mp->tx_sloti ^= 0x10;
mp->tx_count++;
}
return IRQ_HANDLED;
}
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Macintosh MACE ethernet driver");
static int __devexit mac_mace_device_remove (struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
struct mace_data *mp = netdev_priv(dev);
unregister_netdev(dev);
free_irq(dev->irq, dev);
free_irq(IRQ_MAC_MACE_DMA, dev);
dma_free_coherent(mp->device, N_RX_RING * MACE_BUFF_SIZE,
mp->rx_ring, mp->rx_ring_phys);
dma_free_coherent(mp->device, N_TX_RING * MACE_BUFF_SIZE,
mp->tx_ring, mp->tx_ring_phys);
free_netdev(dev);
return 0;
}
static struct platform_driver mac_mace_driver = {
.probe = mace_probe,
.remove = __devexit_p(mac_mace_device_remove),
.driver = {
.name = mac_mace_string,
},
};
static int __init mac_mace_init_module(void)
{
int err;
if ((err = platform_driver_register(&mac_mace_driver))) {
printk(KERN_ERR "Driver registration failed\n");
return err;
}
mac_mace_device = platform_device_alloc(mac_mace_string, 0);
if (!mac_mace_device)
goto out_unregister;
if (platform_device_add(mac_mace_device)) {
platform_device_put(mac_mace_device);
mac_mace_device = NULL;
}
return 0;
out_unregister:
platform_driver_unregister(&mac_mace_driver);
return -ENOMEM;
}
static void __exit mac_mace_cleanup_module(void)
{
platform_driver_unregister(&mac_mace_driver);
if (mac_mace_device) {
platform_device_unregister(mac_mace_device);
mac_mace_device = NULL;
}
}
module_init(mac_mace_init_module);
module_exit(mac_mace_cleanup_module);
