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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a65a688182
A pointer to sgiseeq_probe is passed to the core via platform_driver_register and so the function must not disappear when the .init sections are discarded. Otherwise (if also having HOTPLUG=y) unbinding and binding a device to the driver via sysfs will result in an oops as does a device being registered late. An alternative to this patch is using platform_driver_probe instead of platform_driver_register plus removing the pointer to the probe function from the struct platform_driver. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Wang Chen <wangchen@cn.fujitsu.com> Cc: David S. Miller <davem@davemloft.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jeff Garzik <jgarzik@redhat.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Acked-by: Ralf Baechle <ralf@linux-mips.org> Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
858 lines
22 KiB
C
858 lines
22 KiB
C
/*
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* sgiseeq.c: Seeq8003 ethernet driver for SGI machines.
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*
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* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/platform_device.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <asm/sgi/hpc3.h>
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#include <asm/sgi/ip22.h>
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#include <asm/sgi/seeq.h>
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#include "sgiseeq.h"
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static char *sgiseeqstr = "SGI Seeq8003";
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/*
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* If you want speed, you do something silly, it always has worked for me. So,
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* with that in mind, I've decided to make this driver look completely like a
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* stupid Lance from a driver architecture perspective. Only difference is that
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* here our "ring buffer" looks and acts like a real Lance one does but is
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* layed out like how the HPC DMA and the Seeq want it to. You'd be surprised
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* how a stupid idea like this can pay off in performance, not to mention
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* making this driver 2,000 times easier to write. ;-)
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*/
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/* Tune these if we tend to run out often etc. */
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#define SEEQ_RX_BUFFERS 16
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#define SEEQ_TX_BUFFERS 16
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#define PKT_BUF_SZ 1584
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#define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
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#define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
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#define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
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#define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
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#define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
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sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
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sp->tx_old - sp->tx_new - 1)
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#define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \
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(dma_addr_t)((unsigned long)(v) - \
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(unsigned long)((sp)->rx_desc)))
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/* Copy frames shorter than rx_copybreak, otherwise pass on up in
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* a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).
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*/
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static int rx_copybreak = 100;
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#define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))
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struct sgiseeq_rx_desc {
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volatile struct hpc_dma_desc rdma;
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u8 padding[PAD_SIZE];
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struct sk_buff *skb;
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};
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struct sgiseeq_tx_desc {
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volatile struct hpc_dma_desc tdma;
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u8 padding[PAD_SIZE];
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struct sk_buff *skb;
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};
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/*
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* Warning: This structure is layed out in a certain way because HPC dma
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* descriptors must be 8-byte aligned. So don't touch this without
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* some care.
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*/
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struct sgiseeq_init_block { /* Note the name ;-) */
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struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
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struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
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};
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struct sgiseeq_private {
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struct sgiseeq_init_block *srings;
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dma_addr_t srings_dma;
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/* Ptrs to the descriptors in uncached space. */
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struct sgiseeq_rx_desc *rx_desc;
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struct sgiseeq_tx_desc *tx_desc;
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char *name;
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struct hpc3_ethregs *hregs;
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struct sgiseeq_regs *sregs;
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/* Ring entry counters. */
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unsigned int rx_new, tx_new;
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unsigned int rx_old, tx_old;
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int is_edlc;
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unsigned char control;
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unsigned char mode;
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spinlock_t tx_lock;
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};
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static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr)
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{
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dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
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DMA_FROM_DEVICE);
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}
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static inline void dma_sync_desc_dev(struct net_device *dev, void *addr)
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{
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dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
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DMA_TO_DEVICE);
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}
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static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
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{
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hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
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udelay(20);
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hregs->reset = 0;
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}
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static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
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struct sgiseeq_regs *sregs)
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{
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hregs->rx_ctrl = hregs->tx_ctrl = 0;
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hpc3_eth_reset(hregs);
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}
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#define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
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SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
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static inline void seeq_go(struct sgiseeq_private *sp,
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struct hpc3_ethregs *hregs,
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struct sgiseeq_regs *sregs)
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{
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sregs->rstat = sp->mode | RSTAT_GO_BITS;
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hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
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}
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static inline void __sgiseeq_set_mac_address(struct net_device *dev)
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{
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struct sgiseeq_private *sp = netdev_priv(dev);
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struct sgiseeq_regs *sregs = sp->sregs;
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int i;
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sregs->tstat = SEEQ_TCMD_RB0;
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for (i = 0; i < 6; i++)
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sregs->rw.eth_addr[i] = dev->dev_addr[i];
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}
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static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
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{
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struct sgiseeq_private *sp = netdev_priv(dev);
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struct sockaddr *sa = addr;
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memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
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spin_lock_irq(&sp->tx_lock);
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__sgiseeq_set_mac_address(dev);
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spin_unlock_irq(&sp->tx_lock);
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return 0;
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}
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#define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
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#define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
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#define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
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static int seeq_init_ring(struct net_device *dev)
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{
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struct sgiseeq_private *sp = netdev_priv(dev);
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int i;
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netif_stop_queue(dev);
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sp->rx_new = sp->tx_new = 0;
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sp->rx_old = sp->tx_old = 0;
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__sgiseeq_set_mac_address(dev);
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/* Setup tx ring. */
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for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
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sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
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dma_sync_desc_dev(dev, &sp->tx_desc[i]);
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}
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/* And now the rx ring. */
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for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
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if (!sp->rx_desc[i].skb) {
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dma_addr_t dma_addr;
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struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
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if (skb == NULL)
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return -ENOMEM;
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skb_reserve(skb, 2);
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dma_addr = dma_map_single(dev->dev.parent,
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skb->data - 2,
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PKT_BUF_SZ, DMA_FROM_DEVICE);
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sp->rx_desc[i].skb = skb;
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sp->rx_desc[i].rdma.pbuf = dma_addr;
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}
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sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
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dma_sync_desc_dev(dev, &sp->rx_desc[i]);
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}
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sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
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dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]);
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return 0;
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}
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static void seeq_purge_ring(struct net_device *dev)
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{
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struct sgiseeq_private *sp = netdev_priv(dev);
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int i;
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/* clear tx ring. */
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for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
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if (sp->tx_desc[i].skb) {
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dev_kfree_skb(sp->tx_desc[i].skb);
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sp->tx_desc[i].skb = NULL;
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}
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}
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/* And now the rx ring. */
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for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
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if (sp->rx_desc[i].skb) {
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dev_kfree_skb(sp->rx_desc[i].skb);
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sp->rx_desc[i].skb = NULL;
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}
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}
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}
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#ifdef DEBUG
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static struct sgiseeq_private *gpriv;
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static struct net_device *gdev;
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static void sgiseeq_dump_rings(void)
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{
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static int once;
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struct sgiseeq_rx_desc *r = gpriv->rx_desc;
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struct sgiseeq_tx_desc *t = gpriv->tx_desc;
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struct hpc3_ethregs *hregs = gpriv->hregs;
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int i;
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if (once)
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return;
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once++;
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printk("RING DUMP:\n");
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for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
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printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
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i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
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r[i].rdma.pnext);
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i += 1;
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printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
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i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
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r[i].rdma.pnext);
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}
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for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
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printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
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i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
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t[i].tdma.pnext);
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i += 1;
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printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
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i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
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t[i].tdma.pnext);
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}
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printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
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gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
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printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
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hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
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printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
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hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
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}
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#endif
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#define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
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#define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
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static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
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struct sgiseeq_regs *sregs)
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{
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struct hpc3_ethregs *hregs = sp->hregs;
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int err;
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reset_hpc3_and_seeq(hregs, sregs);
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err = seeq_init_ring(dev);
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if (err)
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return err;
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/* Setup to field the proper interrupt types. */
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if (sp->is_edlc) {
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sregs->tstat = TSTAT_INIT_EDLC;
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sregs->rw.wregs.control = sp->control;
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sregs->rw.wregs.frame_gap = 0;
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} else {
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sregs->tstat = TSTAT_INIT_SEEQ;
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}
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hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc);
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hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc);
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seeq_go(sp, hregs, sregs);
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return 0;
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}
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static void record_rx_errors(struct net_device *dev, unsigned char status)
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{
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if (status & SEEQ_RSTAT_OVERF ||
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status & SEEQ_RSTAT_SFRAME)
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dev->stats.rx_over_errors++;
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if (status & SEEQ_RSTAT_CERROR)
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dev->stats.rx_crc_errors++;
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if (status & SEEQ_RSTAT_DERROR)
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dev->stats.rx_frame_errors++;
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if (status & SEEQ_RSTAT_REOF)
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dev->stats.rx_errors++;
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}
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static inline void rx_maybe_restart(struct sgiseeq_private *sp,
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struct hpc3_ethregs *hregs,
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struct sgiseeq_regs *sregs)
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{
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if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
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hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new);
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seeq_go(sp, hregs, sregs);
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}
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}
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static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
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struct hpc3_ethregs *hregs,
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struct sgiseeq_regs *sregs)
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{
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struct sgiseeq_rx_desc *rd;
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struct sk_buff *skb = NULL;
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struct sk_buff *newskb;
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unsigned char pkt_status;
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int len = 0;
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unsigned int orig_end = PREV_RX(sp->rx_new);
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/* Service every received packet. */
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rd = &sp->rx_desc[sp->rx_new];
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dma_sync_desc_cpu(dev, rd);
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while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {
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len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
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dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,
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PKT_BUF_SZ, DMA_FROM_DEVICE);
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pkt_status = rd->skb->data[len];
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if (pkt_status & SEEQ_RSTAT_FIG) {
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/* Packet is OK. */
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/* We don't want to receive our own packets */
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if (memcmp(rd->skb->data + 6, dev->dev_addr, ETH_ALEN)) {
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if (len > rx_copybreak) {
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skb = rd->skb;
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newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
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if (!newskb) {
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newskb = skb;
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skb = NULL;
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goto memory_squeeze;
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}
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skb_reserve(newskb, 2);
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} else {
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skb = netdev_alloc_skb(dev, len + 2);
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if (skb) {
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skb_reserve(skb, 2);
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skb_copy_to_linear_data(skb, rd->skb->data, len);
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}
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newskb = rd->skb;
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}
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memory_squeeze:
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if (skb) {
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skb_put(skb, len);
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skb->protocol = eth_type_trans(skb, dev);
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netif_rx(skb);
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dev->stats.rx_packets++;
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dev->stats.rx_bytes += len;
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} else {
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printk(KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
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dev->name);
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dev->stats.rx_dropped++;
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}
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} else {
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/* Silently drop my own packets */
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newskb = rd->skb;
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}
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} else {
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record_rx_errors(dev, pkt_status);
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newskb = rd->skb;
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}
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rd->skb = newskb;
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rd->rdma.pbuf = dma_map_single(dev->dev.parent,
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newskb->data - 2,
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PKT_BUF_SZ, DMA_FROM_DEVICE);
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/* Return the entry to the ring pool. */
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rd->rdma.cntinfo = RCNTINFO_INIT;
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sp->rx_new = NEXT_RX(sp->rx_new);
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dma_sync_desc_dev(dev, rd);
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rd = &sp->rx_desc[sp->rx_new];
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dma_sync_desc_cpu(dev, rd);
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}
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dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]);
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sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
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dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]);
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dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
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sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
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dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
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rx_maybe_restart(sp, hregs, sregs);
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}
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static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
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struct sgiseeq_regs *sregs)
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{
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if (sp->is_edlc) {
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sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
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sregs->rw.wregs.control = sp->control;
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}
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}
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static inline void kick_tx(struct net_device *dev,
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struct sgiseeq_private *sp,
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struct hpc3_ethregs *hregs)
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{
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struct sgiseeq_tx_desc *td;
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int i = sp->tx_old;
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/* If the HPC aint doin nothin, and there are more packets
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* with ETXD cleared and XIU set we must make very certain
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* that we restart the HPC else we risk locking up the
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* adapter. The following code is only safe iff the HPCDMA
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* is not active!
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*/
|
|
td = &sp->tx_desc[i];
|
|
dma_sync_desc_cpu(dev, td);
|
|
while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
|
|
(HPCDMA_XIU | HPCDMA_ETXD)) {
|
|
i = NEXT_TX(i);
|
|
td = &sp->tx_desc[i];
|
|
dma_sync_desc_cpu(dev, td);
|
|
}
|
|
if (td->tdma.cntinfo & HPCDMA_XIU) {
|
|
hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
|
|
hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
|
|
}
|
|
}
|
|
|
|
static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
|
|
struct hpc3_ethregs *hregs,
|
|
struct sgiseeq_regs *sregs)
|
|
{
|
|
struct sgiseeq_tx_desc *td;
|
|
unsigned long status = hregs->tx_ctrl;
|
|
int j;
|
|
|
|
tx_maybe_reset_collisions(sp, sregs);
|
|
|
|
if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
|
|
/* Oops, HPC detected some sort of error. */
|
|
if (status & SEEQ_TSTAT_R16)
|
|
dev->stats.tx_aborted_errors++;
|
|
if (status & SEEQ_TSTAT_UFLOW)
|
|
dev->stats.tx_fifo_errors++;
|
|
if (status & SEEQ_TSTAT_LCLS)
|
|
dev->stats.collisions++;
|
|
}
|
|
|
|
/* Ack 'em... */
|
|
for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
|
|
td = &sp->tx_desc[j];
|
|
|
|
dma_sync_desc_cpu(dev, td);
|
|
if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
|
|
break;
|
|
if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
|
|
if (!(status & HPC3_ETXCTRL_ACTIVE)) {
|
|
hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
|
|
hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
|
|
}
|
|
break;
|
|
}
|
|
dev->stats.tx_packets++;
|
|
sp->tx_old = NEXT_TX(sp->tx_old);
|
|
td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
|
|
td->tdma.cntinfo |= HPCDMA_EOX;
|
|
if (td->skb) {
|
|
dev_kfree_skb_any(td->skb);
|
|
td->skb = NULL;
|
|
}
|
|
dma_sync_desc_dev(dev, td);
|
|
}
|
|
}
|
|
|
|
static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct net_device *dev = (struct net_device *) dev_id;
|
|
struct sgiseeq_private *sp = netdev_priv(dev);
|
|
struct hpc3_ethregs *hregs = sp->hregs;
|
|
struct sgiseeq_regs *sregs = sp->sregs;
|
|
|
|
spin_lock(&sp->tx_lock);
|
|
|
|
/* Ack the IRQ and set software state. */
|
|
hregs->reset = HPC3_ERST_CLRIRQ;
|
|
|
|
/* Always check for received packets. */
|
|
sgiseeq_rx(dev, sp, hregs, sregs);
|
|
|
|
/* Only check for tx acks if we have something queued. */
|
|
if (sp->tx_old != sp->tx_new)
|
|
sgiseeq_tx(dev, sp, hregs, sregs);
|
|
|
|
if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
|
|
netif_wake_queue(dev);
|
|
}
|
|
spin_unlock(&sp->tx_lock);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int sgiseeq_open(struct net_device *dev)
|
|
{
|
|
struct sgiseeq_private *sp = netdev_priv(dev);
|
|
struct sgiseeq_regs *sregs = sp->sregs;
|
|
unsigned int irq = dev->irq;
|
|
int err;
|
|
|
|
if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
|
|
printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
|
|
err = -EAGAIN;
|
|
}
|
|
|
|
err = init_seeq(dev, sp, sregs);
|
|
if (err)
|
|
goto out_free_irq;
|
|
|
|
netif_start_queue(dev);
|
|
|
|
return 0;
|
|
|
|
out_free_irq:
|
|
free_irq(irq, dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int sgiseeq_close(struct net_device *dev)
|
|
{
|
|
struct sgiseeq_private *sp = netdev_priv(dev);
|
|
struct sgiseeq_regs *sregs = sp->sregs;
|
|
unsigned int irq = dev->irq;
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
/* Shutdown the Seeq. */
|
|
reset_hpc3_and_seeq(sp->hregs, sregs);
|
|
free_irq(irq, dev);
|
|
seeq_purge_ring(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int sgiseeq_reset(struct net_device *dev)
|
|
{
|
|
struct sgiseeq_private *sp = netdev_priv(dev);
|
|
struct sgiseeq_regs *sregs = sp->sregs;
|
|
int err;
|
|
|
|
err = init_seeq(dev, sp, sregs);
|
|
if (err)
|
|
return err;
|
|
|
|
dev->trans_start = jiffies;
|
|
netif_wake_queue(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct sgiseeq_private *sp = netdev_priv(dev);
|
|
struct hpc3_ethregs *hregs = sp->hregs;
|
|
unsigned long flags;
|
|
struct sgiseeq_tx_desc *td;
|
|
int len, entry;
|
|
|
|
spin_lock_irqsave(&sp->tx_lock, flags);
|
|
|
|
/* Setup... */
|
|
len = skb->len;
|
|
if (len < ETH_ZLEN) {
|
|
if (skb_padto(skb, ETH_ZLEN))
|
|
return NETDEV_TX_OK;
|
|
len = ETH_ZLEN;
|
|
}
|
|
|
|
dev->stats.tx_bytes += len;
|
|
entry = sp->tx_new;
|
|
td = &sp->tx_desc[entry];
|
|
dma_sync_desc_cpu(dev, td);
|
|
|
|
/* Create entry. There are so many races with adding a new
|
|
* descriptor to the chain:
|
|
* 1) Assume that the HPC is off processing a DMA chain while
|
|
* we are changing all of the following.
|
|
* 2) Do no allow the HPC to look at a new descriptor until
|
|
* we have completely set up it's state. This means, do
|
|
* not clear HPCDMA_EOX in the current last descritptor
|
|
* until the one we are adding looks consistent and could
|
|
* be processes right now.
|
|
* 3) The tx interrupt code must notice when we've added a new
|
|
* entry and the HPC got to the end of the chain before we
|
|
* added this new entry and restarted it.
|
|
*/
|
|
td->skb = skb;
|
|
td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data,
|
|
len, DMA_TO_DEVICE);
|
|
td->tdma.cntinfo = (len & HPCDMA_BCNT) |
|
|
HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
|
|
dma_sync_desc_dev(dev, td);
|
|
if (sp->tx_old != sp->tx_new) {
|
|
struct sgiseeq_tx_desc *backend;
|
|
|
|
backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
|
|
dma_sync_desc_cpu(dev, backend);
|
|
backend->tdma.cntinfo &= ~HPCDMA_EOX;
|
|
dma_sync_desc_dev(dev, backend);
|
|
}
|
|
sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
|
|
|
|
/* Maybe kick the HPC back into motion. */
|
|
if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
|
|
kick_tx(dev, sp, hregs);
|
|
|
|
dev->trans_start = jiffies;
|
|
|
|
if (!TX_BUFFS_AVAIL(sp))
|
|
netif_stop_queue(dev);
|
|
spin_unlock_irqrestore(&sp->tx_lock, flags);
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static void timeout(struct net_device *dev)
|
|
{
|
|
printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
|
|
sgiseeq_reset(dev);
|
|
|
|
dev->trans_start = jiffies;
|
|
netif_wake_queue(dev);
|
|
}
|
|
|
|
static void sgiseeq_set_multicast(struct net_device *dev)
|
|
{
|
|
struct sgiseeq_private *sp = netdev_priv(dev);
|
|
unsigned char oldmode = sp->mode;
|
|
|
|
if(dev->flags & IFF_PROMISC)
|
|
sp->mode = SEEQ_RCMD_RANY;
|
|
else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count)
|
|
sp->mode = SEEQ_RCMD_RBMCAST;
|
|
else
|
|
sp->mode = SEEQ_RCMD_RBCAST;
|
|
|
|
/* XXX I know this sucks, but is there a better way to reprogram
|
|
* XXX the receiver? At least, this shouldn't happen too often.
|
|
*/
|
|
|
|
if (oldmode != sp->mode)
|
|
sgiseeq_reset(dev);
|
|
}
|
|
|
|
static inline void setup_tx_ring(struct net_device *dev,
|
|
struct sgiseeq_tx_desc *buf,
|
|
int nbufs)
|
|
{
|
|
struct sgiseeq_private *sp = netdev_priv(dev);
|
|
int i = 0;
|
|
|
|
while (i < (nbufs - 1)) {
|
|
buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
|
|
buf[i].tdma.pbuf = 0;
|
|
dma_sync_desc_dev(dev, &buf[i]);
|
|
i++;
|
|
}
|
|
buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf);
|
|
dma_sync_desc_dev(dev, &buf[i]);
|
|
}
|
|
|
|
static inline void setup_rx_ring(struct net_device *dev,
|
|
struct sgiseeq_rx_desc *buf,
|
|
int nbufs)
|
|
{
|
|
struct sgiseeq_private *sp = netdev_priv(dev);
|
|
int i = 0;
|
|
|
|
while (i < (nbufs - 1)) {
|
|
buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
|
|
buf[i].rdma.pbuf = 0;
|
|
dma_sync_desc_dev(dev, &buf[i]);
|
|
i++;
|
|
}
|
|
buf[i].rdma.pbuf = 0;
|
|
buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf);
|
|
dma_sync_desc_dev(dev, &buf[i]);
|
|
}
|
|
|
|
static const struct net_device_ops sgiseeq_netdev_ops = {
|
|
.ndo_open = sgiseeq_open,
|
|
.ndo_stop = sgiseeq_close,
|
|
.ndo_start_xmit = sgiseeq_start_xmit,
|
|
.ndo_tx_timeout = timeout,
|
|
.ndo_set_multicast_list = sgiseeq_set_multicast,
|
|
.ndo_set_mac_address = sgiseeq_set_mac_address,
|
|
.ndo_change_mtu = eth_change_mtu,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
};
|
|
|
|
static int __devinit sgiseeq_probe(struct platform_device *pdev)
|
|
{
|
|
struct sgiseeq_platform_data *pd = pdev->dev.platform_data;
|
|
struct hpc3_regs *hpcregs = pd->hpc;
|
|
struct sgiseeq_init_block *sr;
|
|
unsigned int irq = pd->irq;
|
|
struct sgiseeq_private *sp;
|
|
struct net_device *dev;
|
|
int err;
|
|
|
|
dev = alloc_etherdev(sizeof (struct sgiseeq_private));
|
|
if (!dev) {
|
|
printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
|
|
err = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, dev);
|
|
sp = netdev_priv(dev);
|
|
|
|
/* Make private data page aligned */
|
|
sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings),
|
|
&sp->srings_dma, GFP_KERNEL);
|
|
if (!sr) {
|
|
printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
|
|
err = -ENOMEM;
|
|
goto err_out_free_dev;
|
|
}
|
|
sp->srings = sr;
|
|
sp->rx_desc = sp->srings->rxvector;
|
|
sp->tx_desc = sp->srings->txvector;
|
|
|
|
/* A couple calculations now, saves many cycles later. */
|
|
setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS);
|
|
setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS);
|
|
|
|
memcpy(dev->dev_addr, pd->mac, ETH_ALEN);
|
|
|
|
#ifdef DEBUG
|
|
gpriv = sp;
|
|
gdev = dev;
|
|
#endif
|
|
sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
|
|
sp->hregs = &hpcregs->ethregs;
|
|
sp->name = sgiseeqstr;
|
|
sp->mode = SEEQ_RCMD_RBCAST;
|
|
|
|
/* Setup PIO and DMA transfer timing */
|
|
sp->hregs->pconfig = 0x161;
|
|
sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
|
|
HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
|
|
|
|
/* Setup PIO and DMA transfer timing */
|
|
sp->hregs->pconfig = 0x161;
|
|
sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
|
|
HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
|
|
|
|
/* Reset the chip. */
|
|
hpc3_eth_reset(sp->hregs);
|
|
|
|
sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
|
|
if (sp->is_edlc)
|
|
sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
|
|
SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
|
|
SEEQ_CTRL_ENCARR;
|
|
|
|
dev->netdev_ops = &sgiseeq_netdev_ops;
|
|
dev->watchdog_timeo = (200 * HZ) / 1000;
|
|
dev->irq = irq;
|
|
|
|
if (register_netdev(dev)) {
|
|
printk(KERN_ERR "Sgiseeq: Cannot register net device, "
|
|
"aborting.\n");
|
|
err = -ENODEV;
|
|
goto err_out_free_page;
|
|
}
|
|
|
|
printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr);
|
|
|
|
return 0;
|
|
|
|
err_out_free_page:
|
|
free_page((unsigned long) sp->srings);
|
|
err_out_free_dev:
|
|
kfree(dev);
|
|
|
|
err_out:
|
|
return err;
|
|
}
|
|
|
|
static int __exit sgiseeq_remove(struct platform_device *pdev)
|
|
{
|
|
struct net_device *dev = platform_get_drvdata(pdev);
|
|
struct sgiseeq_private *sp = netdev_priv(dev);
|
|
|
|
unregister_netdev(dev);
|
|
dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,
|
|
sp->srings_dma);
|
|
free_netdev(dev);
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver sgiseeq_driver = {
|
|
.probe = sgiseeq_probe,
|
|
.remove = __devexit_p(sgiseeq_remove),
|
|
.driver = {
|
|
.name = "sgiseeq",
|
|
.owner = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static int __init sgiseeq_module_init(void)
|
|
{
|
|
if (platform_driver_register(&sgiseeq_driver)) {
|
|
printk(KERN_ERR "Driver registration failed\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit sgiseeq_module_exit(void)
|
|
{
|
|
platform_driver_unregister(&sgiseeq_driver);
|
|
}
|
|
|
|
module_init(sgiseeq_module_init);
|
|
module_exit(sgiseeq_module_exit);
|
|
|
|
MODULE_DESCRIPTION("SGI Seeq 8003 driver");
|
|
MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:sgiseeq");
|