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linux/arch/ppc/8xx_io/enet.c
Al Viro 39e3eb7265 [POWERPC] ARCH=ppc pt_regs fixes 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-10-10 11:55:25 +10:00

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/*
* Ethernet driver for Motorola MPC8xx.
* Copyright (c) 1997 Dan Malek (dmalek@jlc.net)
*
* I copied the basic skeleton from the lance driver, because I did not
* know how to write the Linux driver, but I did know how the LANCE worked.
*
* This version of the driver is somewhat selectable for the different
* processor/board combinations. It works for the boards I know about
* now, and should be easily modified to include others. Some of the
* configuration information is contained in <asm/commproc.h> and the
* remainder is here.
*
* Buffer descriptors are kept in the CPM dual port RAM, and the frame
* buffers are in the host memory.
*
* Right now, I am very watseful with the buffers. I allocate memory
* pages and then divide them into 2K frame buffers. This way I know I
* have buffers large enough to hold one frame within one buffer descriptor.
* Once I get this working, I will use 64 or 128 byte CPM buffers, which
* will be much more memory efficient and will easily handle lots of
* small packets.
*
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/dma-mapping.h>
#include <linux/bitops.h>
#include <asm/8xx_immap.h>
#include <asm/pgtable.h>
#include <asm/mpc8xx.h>
#include <asm/uaccess.h>
#include <asm/commproc.h>
/*
* Theory of Operation
*
* The MPC8xx CPM performs the Ethernet processing on SCC1. It can use
* an aribtrary number of buffers on byte boundaries, but must have at
* least two receive buffers to prevent constant overrun conditions.
*
* The buffer descriptors are allocated from the CPM dual port memory
* with the data buffers allocated from host memory, just like all other
* serial communication protocols. The host memory buffers are allocated
* from the free page pool, and then divided into smaller receive and
* transmit buffers. The size of the buffers should be a power of two,
* since that nicely divides the page. This creates a ring buffer
* structure similar to the LANCE and other controllers.
*
* Like the LANCE driver:
* The driver runs as two independent, single-threaded flows of control. One
* is the send-packet routine, which enforces single-threaded use by the
* cep->tx_busy flag. The other thread is the interrupt handler, which is
* single threaded by the hardware and other software.
*
* The send packet thread has partial control over the Tx ring and the
* 'cep->tx_busy' flag. It sets the tx_busy flag whenever it's queuing a Tx
* packet. If the next queue slot is empty, it clears the tx_busy flag when
* finished otherwise it sets the 'lp->tx_full' flag.
*
* The MBX has a control register external to the MPC8xx that has some
* control of the Ethernet interface. Information is in the manual for
* your board.
*
* The RPX boards have an external control/status register. Consult the
* programming documents for details unique to your board.
*
* For the TQM8xx(L) modules, there is no control register interface.
* All functions are directly controlled using I/O pins. See <asm/commproc.h>.
*/
/* The transmitter timeout
*/
#define TX_TIMEOUT (2*HZ)
/* The number of Tx and Rx buffers. These are allocated from the page
* pool. The code may assume these are power of two, so it is best
* to keep them that size.
* We don't need to allocate pages for the transmitter. We just use
* the skbuffer directly.
*/
#ifdef CONFIG_ENET_BIG_BUFFERS
#define CPM_ENET_RX_PAGES 32
#define CPM_ENET_RX_FRSIZE 2048
#define CPM_ENET_RX_FRPPG (PAGE_SIZE / CPM_ENET_RX_FRSIZE)
#define RX_RING_SIZE (CPM_ENET_RX_FRPPG * CPM_ENET_RX_PAGES)
#define TX_RING_SIZE 64 /* Must be power of two */
#define TX_RING_MOD_MASK 63 /* for this to work */
#else
#define CPM_ENET_RX_PAGES 4
#define CPM_ENET_RX_FRSIZE 2048
#define CPM_ENET_RX_FRPPG (PAGE_SIZE / CPM_ENET_RX_FRSIZE)
#define RX_RING_SIZE (CPM_ENET_RX_FRPPG * CPM_ENET_RX_PAGES)
#define TX_RING_SIZE 8 /* Must be power of two */
#define TX_RING_MOD_MASK 7 /* for this to work */
#endif
/* The CPM stores dest/src/type, data, and checksum for receive packets.
*/
#define PKT_MAXBUF_SIZE 1518
#define PKT_MINBUF_SIZE 64
#define PKT_MAXBLR_SIZE 1520
/* The CPM buffer descriptors track the ring buffers. The rx_bd_base and
* tx_bd_base always point to the base of the buffer descriptors. The
* cur_rx and cur_tx point to the currently available buffer.
* The dirty_tx tracks the current buffer that is being sent by the
* controller. The cur_tx and dirty_tx are equal under both completely
* empty and completely full conditions. The empty/ready indicator in
* the buffer descriptor determines the actual condition.
*/
struct scc_enet_private {
/* The saved address of a sent-in-place packet/buffer, for skfree(). */
struct sk_buff* tx_skbuff[TX_RING_SIZE];
ushort skb_cur;
ushort skb_dirty;
/* CPM dual port RAM relative addresses.
*/
cbd_t *rx_bd_base; /* Address of Rx and Tx buffers. */
cbd_t *tx_bd_base;
cbd_t *cur_rx, *cur_tx; /* The next free ring entry */
cbd_t *dirty_tx; /* The ring entries to be free()ed. */
scc_t *sccp;
/* Virtual addresses for the receive buffers because we can't
* do a __va() on them anymore.
*/
unsigned char *rx_vaddr[RX_RING_SIZE];
struct net_device_stats stats;
uint tx_full;
spinlock_t lock;
};
static int scc_enet_open(struct net_device *dev);
static int scc_enet_start_xmit(struct sk_buff *skb, struct net_device *dev);
static int scc_enet_rx(struct net_device *dev);
static void scc_enet_interrupt(void *dev_id);
static int scc_enet_close(struct net_device *dev);
static struct net_device_stats *scc_enet_get_stats(struct net_device *dev);
static void set_multicast_list(struct net_device *dev);
/* Get this from various configuration locations (depends on board).
*/
/*static ushort my_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };*/
/* Typically, 860(T) boards use SCC1 for Ethernet, and other 8xx boards
* use SCC2. Some even may use SCC3.
* This is easily extended if necessary.
*/
#if defined(CONFIG_SCC3_ENET)
#define CPM_CR_ENET CPM_CR_CH_SCC3
#define PROFF_ENET PROFF_SCC3
#define SCC_ENET 2 /* Index, not number! */
#define CPMVEC_ENET CPMVEC_SCC3
#elif defined(CONFIG_SCC2_ENET)
#define CPM_CR_ENET CPM_CR_CH_SCC2
#define PROFF_ENET PROFF_SCC2
#define SCC_ENET 1 /* Index, not number! */
#define CPMVEC_ENET CPMVEC_SCC2
#elif defined(CONFIG_SCC1_ENET)
#define CPM_CR_ENET CPM_CR_CH_SCC1
#define PROFF_ENET PROFF_SCC1
#define SCC_ENET 0 /* Index, not number! */
#define CPMVEC_ENET CPMVEC_SCC1
#else
#error CONFIG_SCCx_ENET not defined
#endif
static int
scc_enet_open(struct net_device *dev)
{
/* I should reset the ring buffers here, but I don't yet know
* a simple way to do that.
*/
netif_start_queue(dev);
return 0; /* Always succeed */
}
static int
scc_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct scc_enet_private *cep = (struct scc_enet_private *)dev->priv;
volatile cbd_t *bdp;
/* Fill in a Tx ring entry */
bdp = cep->cur_tx;
#ifndef final_version
if (bdp->cbd_sc & BD_ENET_TX_READY) {
/* Ooops. All transmit buffers are full. Bail out.
* This should not happen, since cep->tx_busy should be set.
*/
printk("%s: tx queue full!.\n", dev->name);
return 1;
}
#endif
/* Clear all of the status flags.
*/
bdp->cbd_sc &= ~BD_ENET_TX_STATS;
/* If the frame is short, tell CPM to pad it.
*/
if (skb->len <= ETH_ZLEN)
bdp->cbd_sc |= BD_ENET_TX_PAD;
else
bdp->cbd_sc &= ~BD_ENET_TX_PAD;
/* Set buffer length and buffer pointer.
*/
bdp->cbd_datlen = skb->len;
bdp->cbd_bufaddr = __pa(skb->data);
/* Save skb pointer.
*/
cep->tx_skbuff[cep->skb_cur] = skb;
cep->stats.tx_bytes += skb->len;
cep->skb_cur = (cep->skb_cur+1) & TX_RING_MOD_MASK;
/* Push the data cache so the CPM does not get stale memory
* data.
*/
flush_dcache_range((unsigned long)(skb->data),
(unsigned long)(skb->data + skb->len));
spin_lock_irq(&cep->lock);
/* Send it on its way. Tell CPM its ready, interrupt when done,
* its the last BD of the frame, and to put the CRC on the end.
*/
bdp->cbd_sc |= (BD_ENET_TX_READY | BD_ENET_TX_INTR | BD_ENET_TX_LAST | BD_ENET_TX_TC);
dev->trans_start = jiffies;
/* If this was the last BD in the ring, start at the beginning again.
*/
if (bdp->cbd_sc & BD_ENET_TX_WRAP)
bdp = cep->tx_bd_base;
else
bdp++;
if (bdp->cbd_sc & BD_ENET_TX_READY) {
netif_stop_queue(dev);
cep->tx_full = 1;
}
cep->cur_tx = (cbd_t *)bdp;
spin_unlock_irq(&cep->lock);
return 0;
}
static void
scc_enet_timeout(struct net_device *dev)
{
struct scc_enet_private *cep = (struct scc_enet_private *)dev->priv;
printk("%s: transmit timed out.\n", dev->name);
cep->stats.tx_errors++;
#ifndef final_version
{
int i;
cbd_t *bdp;
printk(" Ring data dump: cur_tx %p%s cur_rx %p.\n",
cep->cur_tx, cep->tx_full ? " (full)" : "",
cep->cur_rx);
bdp = cep->tx_bd_base;
for (i = 0 ; i < TX_RING_SIZE; i++, bdp++)
printk("%04x %04x %08x\n",
bdp->cbd_sc,
bdp->cbd_datlen,
bdp->cbd_bufaddr);
bdp = cep->rx_bd_base;
for (i = 0 ; i < RX_RING_SIZE; i++, bdp++)
printk("%04x %04x %08x\n",
bdp->cbd_sc,
bdp->cbd_datlen,
bdp->cbd_bufaddr);
}
#endif
if (!cep->tx_full)
netif_wake_queue(dev);
}
/* The interrupt handler.
* This is called from the CPM handler, not the MPC core interrupt.
*/
static void
scc_enet_interrupt(void *dev_id)
{
struct net_device *dev = dev_id;
volatile struct scc_enet_private *cep;
volatile cbd_t *bdp;
ushort int_events;
int must_restart;
cep = (struct scc_enet_private *)dev->priv;
/* Get the interrupt events that caused us to be here.
*/
int_events = cep->sccp->scc_scce;
cep->sccp->scc_scce = int_events;
must_restart = 0;
/* Handle receive event in its own function.
*/
if (int_events & SCCE_ENET_RXF)
scc_enet_rx(dev_id);
/* Check for a transmit error. The manual is a little unclear
* about this, so the debug code until I get it figured out. It
* appears that if TXE is set, then TXB is not set. However,
* if carrier sense is lost during frame transmission, the TXE
* bit is set, "and continues the buffer transmission normally."
* I don't know if "normally" implies TXB is set when the buffer
* descriptor is closed.....trial and error :-).
*/
/* Transmit OK, or non-fatal error. Update the buffer descriptors.
*/
if (int_events & (SCCE_ENET_TXE | SCCE_ENET_TXB)) {
spin_lock(&cep->lock);
bdp = cep->dirty_tx;
while ((bdp->cbd_sc&BD_ENET_TX_READY)==0) {
if ((bdp==cep->cur_tx) && (cep->tx_full == 0))
break;
if (bdp->cbd_sc & BD_ENET_TX_HB) /* No heartbeat */
cep->stats.tx_heartbeat_errors++;
if (bdp->cbd_sc & BD_ENET_TX_LC) /* Late collision */
cep->stats.tx_window_errors++;
if (bdp->cbd_sc & BD_ENET_TX_RL) /* Retrans limit */
cep->stats.tx_aborted_errors++;
if (bdp->cbd_sc & BD_ENET_TX_UN) /* Underrun */
cep->stats.tx_fifo_errors++;
if (bdp->cbd_sc & BD_ENET_TX_CSL) /* Carrier lost */
cep->stats.tx_carrier_errors++;
/* No heartbeat or Lost carrier are not really bad errors.
* The others require a restart transmit command.
*/
if (bdp->cbd_sc &
(BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
must_restart = 1;
cep->stats.tx_errors++;
}
cep->stats.tx_packets++;
/* Deferred means some collisions occurred during transmit,
* but we eventually sent the packet OK.
*/
if (bdp->cbd_sc & BD_ENET_TX_DEF)
cep->stats.collisions++;
/* Free the sk buffer associated with this last transmit.
*/
dev_kfree_skb_irq(cep->tx_skbuff[cep->skb_dirty]);
cep->skb_dirty = (cep->skb_dirty + 1) & TX_RING_MOD_MASK;
/* Update pointer to next buffer descriptor to be transmitted.
*/
if (bdp->cbd_sc & BD_ENET_TX_WRAP)
bdp = cep->tx_bd_base;
else
bdp++;
/* I don't know if we can be held off from processing these
* interrupts for more than one frame time. I really hope
* not. In such a case, we would now want to check the
* currently available BD (cur_tx) and determine if any
* buffers between the dirty_tx and cur_tx have also been
* sent. We would want to process anything in between that
* does not have BD_ENET_TX_READY set.
*/
/* Since we have freed up a buffer, the ring is no longer
* full.
*/
if (cep->tx_full) {
cep->tx_full = 0;
if (netif_queue_stopped(dev))
netif_wake_queue(dev);
}
cep->dirty_tx = (cbd_t *)bdp;
}
if (must_restart) {
volatile cpm8xx_t *cp;
/* Some transmit errors cause the transmitter to shut
* down. We now issue a restart transmit. Since the
* errors close the BD and update the pointers, the restart
* _should_ pick up without having to reset any of our
* pointers either.
*/
cp = cpmp;
cp->cp_cpcr =
mk_cr_cmd(CPM_CR_ENET, CPM_CR_RESTART_TX) | CPM_CR_FLG;
while (cp->cp_cpcr & CPM_CR_FLG);
}
spin_unlock(&cep->lock);
}
/* Check for receive busy, i.e. packets coming but no place to
* put them. This "can't happen" because the receive interrupt
* is tossing previous frames.
*/
if (int_events & SCCE_ENET_BSY) {
cep->stats.rx_dropped++;
printk("CPM ENET: BSY can't happen.\n");
}
return;
}
/* During a receive, the cur_rx points to the current incoming buffer.
* When we update through the ring, if the next incoming buffer has
* not been given to the system, we just set the empty indicator,
* effectively tossing the packet.
*/
static int
scc_enet_rx(struct net_device *dev)
{
struct scc_enet_private *cep;
volatile cbd_t *bdp;
struct sk_buff *skb;
ushort pkt_len;
cep = (struct scc_enet_private *)dev->priv;
/* First, grab all of the stats for the incoming packet.
* These get messed up if we get called due to a busy condition.
*/
bdp = cep->cur_rx;
for (;;) {
if (bdp->cbd_sc & BD_ENET_RX_EMPTY)
break;
#ifndef final_version
/* Since we have allocated space to hold a complete frame, both
* the first and last indicators should be set.
*/
if ((bdp->cbd_sc & (BD_ENET_RX_FIRST | BD_ENET_RX_LAST)) !=
(BD_ENET_RX_FIRST | BD_ENET_RX_LAST))
printk("CPM ENET: rcv is not first+last\n");
#endif
/* Frame too long or too short.
*/
if (bdp->cbd_sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
cep->stats.rx_length_errors++;
if (bdp->cbd_sc & BD_ENET_RX_NO) /* Frame alignment */
cep->stats.rx_frame_errors++;
if (bdp->cbd_sc & BD_ENET_RX_CR) /* CRC Error */
cep->stats.rx_crc_errors++;
if (bdp->cbd_sc & BD_ENET_RX_OV) /* FIFO overrun */
cep->stats.rx_crc_errors++;
/* Report late collisions as a frame error.
* On this error, the BD is closed, but we don't know what we
* have in the buffer. So, just drop this frame on the floor.
*/
if (bdp->cbd_sc & BD_ENET_RX_CL) {
cep->stats.rx_frame_errors++;
}
else {
/* Process the incoming frame.
*/
cep->stats.rx_packets++;
pkt_len = bdp->cbd_datlen;
cep->stats.rx_bytes += pkt_len;
/* This does 16 byte alignment, much more than we need.
* The packet length includes FCS, but we don't want to
* include that when passing upstream as it messes up
* bridging applications.
*/
skb = dev_alloc_skb(pkt_len-4);
if (skb == NULL) {
printk("%s: Memory squeeze, dropping packet.\n", dev->name);
cep->stats.rx_dropped++;
}
else {
skb->dev = dev;
skb_put(skb,pkt_len-4); /* Make room */
eth_copy_and_sum(skb,
cep->rx_vaddr[bdp - cep->rx_bd_base],
pkt_len-4, 0);
skb->protocol=eth_type_trans(skb,dev);
netif_rx(skb);
}
}
/* Clear the status flags for this buffer.
*/
bdp->cbd_sc &= ~BD_ENET_RX_STATS;
/* Mark the buffer empty.
*/
bdp->cbd_sc |= BD_ENET_RX_EMPTY;
/* Update BD pointer to next entry.
*/
if (bdp->cbd_sc & BD_ENET_RX_WRAP)
bdp = cep->rx_bd_base;
else
bdp++;
}
cep->cur_rx = (cbd_t *)bdp;
return 0;
}
static int
scc_enet_close(struct net_device *dev)
{
/* Don't know what to do yet.
*/
netif_stop_queue(dev);
return 0;
}
static struct net_device_stats *scc_enet_get_stats(struct net_device *dev)
{
struct scc_enet_private *cep = (struct scc_enet_private *)dev->priv;
return &cep->stats;
}
/* Set or clear the multicast filter for this adaptor.
* Skeleton taken from sunlance driver.
* The CPM Ethernet implementation allows Multicast as well as individual
* MAC address filtering. Some of the drivers check to make sure it is
* a group multicast address, and discard those that are not. I guess I
* will do the same for now, but just remove the test if you want
* individual filtering as well (do the upper net layers want or support
* this kind of feature?).
*/
static void set_multicast_list(struct net_device *dev)
{
struct scc_enet_private *cep;
struct dev_mc_list *dmi;
u_char *mcptr, *tdptr;
volatile scc_enet_t *ep;
int i, j;
cep = (struct scc_enet_private *)dev->priv;
/* Get pointer to SCC area in parameter RAM.
*/
ep = (scc_enet_t *)dev->base_addr;
if (dev->flags&IFF_PROMISC) {
/* Log any net taps. */
printk("%s: Promiscuous mode enabled.\n", dev->name);
cep->sccp->scc_psmr |= SCC_PSMR_PRO;
} else {
cep->sccp->scc_psmr &= ~SCC_PSMR_PRO;
if (dev->flags & IFF_ALLMULTI) {
/* Catch all multicast addresses, so set the
* filter to all 1's.
*/
ep->sen_gaddr1 = 0xffff;
ep->sen_gaddr2 = 0xffff;
ep->sen_gaddr3 = 0xffff;
ep->sen_gaddr4 = 0xffff;
}
else {
/* Clear filter and add the addresses in the list.
*/
ep->sen_gaddr1 = 0;
ep->sen_gaddr2 = 0;
ep->sen_gaddr3 = 0;
ep->sen_gaddr4 = 0;
dmi = dev->mc_list;
for (i=0; i<dev->mc_count; i++) {
/* Only support group multicast for now.
*/
if (!(dmi->dmi_addr[0] & 1))
continue;
/* The address in dmi_addr is LSB first,
* and taddr is MSB first. We have to
* copy bytes MSB first from dmi_addr.
*/
mcptr = (u_char *)dmi->dmi_addr + 5;
tdptr = (u_char *)&ep->sen_taddrh;
for (j=0; j<6; j++)
*tdptr++ = *mcptr--;
/* Ask CPM to run CRC and set bit in
* filter mask.
*/
cpmp->cp_cpcr = mk_cr_cmd(CPM_CR_ENET, CPM_CR_SET_GADDR) | CPM_CR_FLG;
/* this delay is necessary here -- Cort */
udelay(10);
while (cpmp->cp_cpcr & CPM_CR_FLG);
}
}
}
}
/* Initialize the CPM Ethernet on SCC. If EPPC-Bug loaded us, or performed
* some other network I/O, a whole bunch of this has already been set up.
* It is no big deal if we do it again, we just have to disable the
* transmit and receive to make sure we don't catch the CPM with some
* inconsistent control information.
*/
static int __init scc_enet_init(void)
{
struct net_device *dev;
struct scc_enet_private *cep;
int i, j, k, err;
uint dp_offset;
unsigned char *eap, *ba;
dma_addr_t mem_addr;
bd_t *bd;
volatile cbd_t *bdp;
volatile cpm8xx_t *cp;
volatile scc_t *sccp;
volatile scc_enet_t *ep;
volatile immap_t *immap;
cp = cpmp; /* Get pointer to Communication Processor */
immap = (immap_t *)(mfspr(SPRN_IMMR) & 0xFFFF0000); /* and to internal registers */
bd = (bd_t *)__res;
dev = alloc_etherdev(sizeof(*cep));
if (!dev)
return -ENOMEM;
cep = dev->priv;
spin_lock_init(&cep->lock);
/* Get pointer to SCC area in parameter RAM.
*/
ep = (scc_enet_t *)(&cp->cp_dparam[PROFF_ENET]);
/* And another to the SCC register area.
*/
sccp = (volatile scc_t *)(&cp->cp_scc[SCC_ENET]);
cep->sccp = (scc_t *)sccp; /* Keep the pointer handy */
/* Disable receive and transmit in case EPPC-Bug started it.
*/
sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
/* Cookbook style from the MPC860 manual.....
* Not all of this is necessary if EPPC-Bug has initialized
* the network.
* So far we are lucky, all board configurations use the same
* pins, or at least the same I/O Port for these functions.....
* It can't last though......
*/
#if (defined(PA_ENET_RXD) && defined(PA_ENET_TXD))
/* Configure port A pins for Txd and Rxd.
*/
immap->im_ioport.iop_papar |= (PA_ENET_RXD | PA_ENET_TXD);
immap->im_ioport.iop_padir &= ~(PA_ENET_RXD | PA_ENET_TXD);
immap->im_ioport.iop_paodr &= ~PA_ENET_TXD;
#elif (defined(PB_ENET_RXD) && defined(PB_ENET_TXD))
/* Configure port B pins for Txd and Rxd.
*/
immap->im_cpm.cp_pbpar |= (PB_ENET_RXD | PB_ENET_TXD);
immap->im_cpm.cp_pbdir &= ~(PB_ENET_RXD | PB_ENET_TXD);
immap->im_cpm.cp_pbodr &= ~PB_ENET_TXD;
#else
#error Exactly ONE pair of PA_ENET_[RT]XD, PB_ENET_[RT]XD must be defined
#endif
#if defined(PC_ENET_LBK)
/* Configure port C pins to disable External Loopback
*/
immap->im_ioport.iop_pcpar &= ~PC_ENET_LBK;
immap->im_ioport.iop_pcdir |= PC_ENET_LBK;
immap->im_ioport.iop_pcso &= ~PC_ENET_LBK;
immap->im_ioport.iop_pcdat &= ~PC_ENET_LBK; /* Disable Loopback */
#endif /* PC_ENET_LBK */
#ifdef PE_ENET_TCLK
/* Configure port E for TCLK and RCLK.
*/
cp->cp_pepar |= (PE_ENET_TCLK | PE_ENET_RCLK);
cp->cp_pedir &= ~(PE_ENET_TCLK | PE_ENET_RCLK);
cp->cp_peso &= ~(PE_ENET_TCLK | PE_ENET_RCLK);
#else
/* Configure port A for TCLK and RCLK.
*/
immap->im_ioport.iop_papar |= (PA_ENET_TCLK | PA_ENET_RCLK);
immap->im_ioport.iop_padir &= ~(PA_ENET_TCLK | PA_ENET_RCLK);
#endif
/* Configure port C pins to enable CLSN and RENA.
*/
immap->im_ioport.iop_pcpar &= ~(PC_ENET_CLSN | PC_ENET_RENA);
immap->im_ioport.iop_pcdir &= ~(PC_ENET_CLSN | PC_ENET_RENA);
immap->im_ioport.iop_pcso |= (PC_ENET_CLSN | PC_ENET_RENA);
/* Configure Serial Interface clock routing.
* First, clear all SCC bits to zero, then set the ones we want.
*/
cp->cp_sicr &= ~SICR_ENET_MASK;
cp->cp_sicr |= SICR_ENET_CLKRT;
/* Manual says set SDDR, but I can't find anything with that
* name. I think it is a misprint, and should be SDCR. This
* has already been set by the communication processor initialization.
*/
/* Allocate space for the buffer descriptors in the DP ram.
* These are relative offsets in the DP ram address space.
* Initialize base addresses for the buffer descriptors.
*/
dp_offset = cpm_dpalloc(sizeof(cbd_t) * RX_RING_SIZE, 8);
ep->sen_genscc.scc_rbase = dp_offset;
cep->rx_bd_base = cpm_dpram_addr(dp_offset);
dp_offset = cpm_dpalloc(sizeof(cbd_t) * TX_RING_SIZE, 8);
ep->sen_genscc.scc_tbase = dp_offset;
cep->tx_bd_base = cpm_dpram_addr(dp_offset);
cep->dirty_tx = cep->cur_tx = cep->tx_bd_base;
cep->cur_rx = cep->rx_bd_base;
/* Issue init Rx BD command for SCC.
* Manual says to perform an Init Rx parameters here. We have
* to perform both Rx and Tx because the SCC may have been
* already running.
* In addition, we have to do it later because we don't yet have
* all of the BD control/status set properly.
cp->cp_cpcr = mk_cr_cmd(CPM_CR_ENET, CPM_CR_INIT_RX) | CPM_CR_FLG;
while (cp->cp_cpcr & CPM_CR_FLG);
*/
/* Initialize function code registers for big-endian.
*/
ep->sen_genscc.scc_rfcr = SCC_EB;
ep->sen_genscc.scc_tfcr = SCC_EB;
/* Set maximum bytes per receive buffer.
* This appears to be an Ethernet frame size, not the buffer
* fragment size. It must be a multiple of four.
*/
ep->sen_genscc.scc_mrblr = PKT_MAXBLR_SIZE;
/* Set CRC preset and mask.
*/
ep->sen_cpres = 0xffffffff;
ep->sen_cmask = 0xdebb20e3;
ep->sen_crcec = 0; /* CRC Error counter */
ep->sen_alec = 0; /* alignment error counter */
ep->sen_disfc = 0; /* discard frame counter */
ep->sen_pads = 0x8888; /* Tx short frame pad character */
ep->sen_retlim = 15; /* Retry limit threshold */
ep->sen_maxflr = PKT_MAXBUF_SIZE; /* maximum frame length register */
ep->sen_minflr = PKT_MINBUF_SIZE; /* minimum frame length register */
ep->sen_maxd1 = PKT_MAXBLR_SIZE; /* maximum DMA1 length */
ep->sen_maxd2 = PKT_MAXBLR_SIZE; /* maximum DMA2 length */
/* Clear hash tables.
*/
ep->sen_gaddr1 = 0;
ep->sen_gaddr2 = 0;
ep->sen_gaddr3 = 0;
ep->sen_gaddr4 = 0;
ep->sen_iaddr1 = 0;
ep->sen_iaddr2 = 0;
ep->sen_iaddr3 = 0;
ep->sen_iaddr4 = 0;
/* Set Ethernet station address.
*/
eap = (unsigned char *)&(ep->sen_paddrh);
for (i=5; i>=0; i--)
*eap++ = dev->dev_addr[i] = bd->bi_enetaddr[i];
ep->sen_pper = 0; /* 'cause the book says so */
ep->sen_taddrl = 0; /* temp address (LSB) */
ep->sen_taddrm = 0;
ep->sen_taddrh = 0; /* temp address (MSB) */
/* Now allocate the host memory pages and initialize the
* buffer descriptors.
*/
bdp = cep->tx_bd_base;
for (i=0; i<TX_RING_SIZE; i++) {
/* Initialize the BD for every fragment in the page.
*/
bdp->cbd_sc = 0;
bdp->cbd_bufaddr = 0;
bdp++;
}
/* Set the last buffer to wrap.
*/
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
bdp = cep->rx_bd_base;
k = 0;
for (i=0; i<CPM_ENET_RX_PAGES; i++) {
/* Allocate a page.
*/
ba = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE,
&mem_addr, GFP_KERNEL);
/* BUG: no check for failure */
/* Initialize the BD for every fragment in the page.
*/
for (j=0; j<CPM_ENET_RX_FRPPG; j++) {
bdp->cbd_sc = BD_ENET_RX_EMPTY | BD_ENET_RX_INTR;
bdp->cbd_bufaddr = mem_addr;
cep->rx_vaddr[k++] = ba;
mem_addr += CPM_ENET_RX_FRSIZE;
ba += CPM_ENET_RX_FRSIZE;
bdp++;
}
}
/* Set the last buffer to wrap.
*/
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
/* Let's re-initialize the channel now. We have to do it later
* than the manual describes because we have just now finished
* the BD initialization.
*/
cp->cp_cpcr = mk_cr_cmd(CPM_CR_ENET, CPM_CR_INIT_TRX) | CPM_CR_FLG;
while (cp->cp_cpcr & CPM_CR_FLG);
cep->skb_cur = cep->skb_dirty = 0;
sccp->scc_scce = 0xffff; /* Clear any pending events */
/* Enable interrupts for transmit error, complete frame
* received, and any transmit buffer we have also set the
* interrupt flag.
*/
sccp->scc_sccm = (SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
/* Install our interrupt handler.
*/
cpm_install_handler(CPMVEC_ENET, scc_enet_interrupt, dev);
/* Set GSMR_H to enable all normal operating modes.
* Set GSMR_L to enable Ethernet to MC68160.
*/
sccp->scc_gsmrh = 0;
sccp->scc_gsmrl = (SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 | SCC_GSMRL_MODE_ENET);
/* Set sync/delimiters.
*/
sccp->scc_dsr = 0xd555;
/* Set processing mode. Use Ethernet CRC, catch broadcast, and
* start frame search 22 bit times after RENA.
*/
sccp->scc_psmr = (SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
/* It is now OK to enable the Ethernet transmitter.
* Unfortunately, there are board implementation differences here.
*/
#if (!defined (PB_ENET_TENA) && defined (PC_ENET_TENA) && !defined (PE_ENET_TENA))
immap->im_ioport.iop_pcpar |= PC_ENET_TENA;
immap->im_ioport.iop_pcdir &= ~PC_ENET_TENA;
#elif ( defined (PB_ENET_TENA) && !defined (PC_ENET_TENA) && !defined (PE_ENET_TENA))
cp->cp_pbpar |= PB_ENET_TENA;
cp->cp_pbdir |= PB_ENET_TENA;
#elif ( !defined (PB_ENET_TENA) && !defined (PC_ENET_TENA) && defined (PE_ENET_TENA))
cp->cp_pepar |= PE_ENET_TENA;
cp->cp_pedir &= ~PE_ENET_TENA;
cp->cp_peso |= PE_ENET_TENA;
#else
#error Configuration Error: define exactly ONE of PB_ENET_TENA, PC_ENET_TENA, PE_ENET_TENA
#endif
#if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC)
/* And while we are here, set the configuration to enable ethernet.
*/
*((volatile uint *)RPX_CSR_ADDR) &= ~BCSR0_ETHLPBK;
*((volatile uint *)RPX_CSR_ADDR) |=
(BCSR0_ETHEN | BCSR0_COLTESTDIS | BCSR0_FULLDPLXDIS);
#endif
#ifdef CONFIG_BSEIP
/* BSE uses port B and C for PHY control.
*/
cp->cp_pbpar &= ~(PB_BSE_POWERUP | PB_BSE_FDXDIS);
cp->cp_pbdir |= (PB_BSE_POWERUP | PB_BSE_FDXDIS);
cp->cp_pbdat |= (PB_BSE_POWERUP | PB_BSE_FDXDIS);
immap->im_ioport.iop_pcpar &= ~PC_BSE_LOOPBACK;
immap->im_ioport.iop_pcdir |= PC_BSE_LOOPBACK;
immap->im_ioport.iop_pcso &= ~PC_BSE_LOOPBACK;
immap->im_ioport.iop_pcdat &= ~PC_BSE_LOOPBACK;
#endif
#ifdef CONFIG_FADS
cp->cp_pbpar |= PB_ENET_TENA;
cp->cp_pbdir |= PB_ENET_TENA;
/* Enable the EEST PHY.
*/
*((volatile uint *)BCSR1) &= ~BCSR1_ETHEN;
#endif
#ifdef CONFIG_MPC885ADS
/* Deassert PHY reset and enable the PHY.
*/
{
volatile uint __iomem *bcsr = ioremap(BCSR_ADDR, BCSR_SIZE);
uint tmp;
tmp = in_be32(bcsr + 1 /* BCSR1 */);
tmp |= BCSR1_ETHEN;
out_be32(bcsr + 1, tmp);
tmp = in_be32(bcsr + 4 /* BCSR4 */);
tmp |= BCSR4_ETH10_RST;
out_be32(bcsr + 4, tmp);
iounmap(bcsr);
}
/* On MPC885ADS SCC ethernet PHY defaults to the full duplex mode
* upon reset. SCC is set to half duplex by default. So this
* inconsistency should be better fixed by the software.
*/
#endif
dev->base_addr = (unsigned long)ep;
#if 0
dev->name = "CPM_ENET";
#endif
/* The CPM Ethernet specific entries in the device structure. */
dev->open = scc_enet_open;
dev->hard_start_xmit = scc_enet_start_xmit;
dev->tx_timeout = scc_enet_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
dev->stop = scc_enet_close;
dev->get_stats = scc_enet_get_stats;
dev->set_multicast_list = set_multicast_list;
err = register_netdev(dev);
if (err) {
free_netdev(dev);
return err;
}
/* And last, enable the transmit and receive processing.
*/
sccp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
printk("%s: CPM ENET Version 0.2 on SCC%d, ", dev->name, SCC_ENET+1);
for (i=0; i<5; i++)
printk("%02x:", dev->dev_addr[i]);
printk("%02x\n", dev->dev_addr[5]);
return 0;
}
module_init(scc_enet_init);
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