diff options
Diffstat (limited to 'target/linux/adm8668/files/arch/mips/adm8668/net_intr.c')
| -rw-r--r-- | target/linux/adm8668/files/arch/mips/adm8668/net_intr.c | 446 |
1 files changed, 0 insertions, 446 deletions
diff --git a/target/linux/adm8668/files/arch/mips/adm8668/net_intr.c b/target/linux/adm8668/files/arch/mips/adm8668/net_intr.c deleted file mode 100644 index 113dbaebd..000000000 --- a/target/linux/adm8668/files/arch/mips/adm8668/net_intr.c +++ /dev/null @@ -1,446 +0,0 @@ -/* - * originally drivers/net/tulip/interrupt.c - * Copyright 2000,2001 The Linux Kernel Team - * Written/copyright 1994-2001 by Donald Becker. - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#include "net.h" - -int tulip_refill_rx(struct net_device *dev) -{ - struct tulip_private *tp = netdev_priv(dev); - int entry; - int refilled = 0; - - /* Refill the Rx ring buffers. */ - for (; tp->cur_rx - tp->dirty_rx > 0; tp->dirty_rx++) { - entry = tp->dirty_rx % RX_RING_SIZE; - if (tp->rx_buffers[entry].skb == NULL) { - struct sk_buff *skb; - dma_addr_t mapping; - - skb = tp->rx_buffers[entry].skb = dev_alloc_skb(PKT_BUF_SZ); - if (skb == NULL) - break; - - mapping = dma_map_single(&dev->dev, skb->data, - PKT_BUF_SZ, DMA_FROM_DEVICE); - tp->rx_buffers[entry].mapping = mapping; - - skb->dev = dev; /* Mark as being used by this device. */ - tp->rx_ring[entry].buffer1 = cpu_to_le32(mapping); - refilled++; - } - tp->rx_ring[entry].status = cpu_to_le32(DescOwned); - } - return refilled; -} - -void oom_timer(unsigned long data) -{ - struct net_device *dev = (struct net_device *)data; - struct tulip_private *tp = netdev_priv(dev); - napi_schedule(&tp->napi); -} - -int tulip_poll(struct napi_struct *napi, int budget) -{ - struct tulip_private *tp = container_of(napi, struct tulip_private, napi); - struct net_device *dev = tp->dev; - int entry = tp->cur_rx % RX_RING_SIZE; - int work_done = 0; - - if (tulip_debug > 4) - printk(KERN_DEBUG " In tulip_rx(), entry %d %08x\n", - entry, tp->rx_ring[entry].status); - - do { - if (ioread32(tp->base_addr + CSR5) == 0xffffffff) { - printk(KERN_DEBUG " In tulip_poll(), hardware disappeared\n"); - break; - } - /* Acknowledge current RX interrupt sources. */ - iowrite32((RxIntr | RxNoBuf), tp->base_addr + CSR5); - - - /* If we own the next entry, it is a new packet. Send it up. */ - while ( ! (tp->rx_ring[entry].status & cpu_to_le32(DescOwned))) { - s32 status = le32_to_cpu(tp->rx_ring[entry].status); - short pkt_len; - - if (tp->dirty_rx + RX_RING_SIZE == tp->cur_rx) - break; - - if (tulip_debug > 5) - printk(KERN_DEBUG "%s: In tulip_rx(), entry %d %08x\n", - dev->name, entry, status); - - if (++work_done >= budget) - goto not_done; - - /* - * Omit the four octet CRC from the length. - * (May not be considered valid until we have - * checked status for RxLengthOver2047 bits) - */ - pkt_len = ((status >> 16) & 0x7ff) - 4; - -#if 0 - csr6 = ioread32(tp->base_addr + CSR6); - if (csr6 & 0x1) - pkt_len += 2; - -#endif - /* - * Maximum pkt_len is 1518 (1514 + vlan header) - * Anything higher than this is always invalid - * regardless of RxLengthOver2047 bits - */ - - if ((status & (RxLengthOver2047 | - RxDescCRCError | - RxDescCollisionSeen | - RxDescRunt | - RxDescDescErr | - RxWholePkt)) != RxWholePkt || - pkt_len > 1518) { - if ((status & (RxLengthOver2047 | - RxWholePkt)) != RxWholePkt) { - /* Ingore earlier buffers. */ - if ((status & 0xffff) != 0x7fff) { - if (tulip_debug > 1) - dev_warn(&dev->dev, - "Oversized Ethernet frame spanned multiple buffers, status %08x!\n", - status); - tp->stats.rx_length_errors++; - } - } else { - /* There was a fatal error. */ - if (tulip_debug > 2) - printk(KERN_DEBUG "%s: Receive error, Rx status %08x\n", - dev->name, status); - tp->stats.rx_errors++; /* end of a packet.*/ - if (pkt_len > 1518 || - (status & RxDescRunt)) - tp->stats.rx_length_errors++; - - if (status & 0x0004) tp->stats.rx_frame_errors++; - if (status & 0x0002) tp->stats.rx_crc_errors++; - if (status & 0x0001) tp->stats.rx_fifo_errors++; - } - } else { - struct sk_buff *skb = tp->rx_buffers[entry].skb; - char *temp = skb_put(skb, pkt_len); - -#if 0 - if (csr6 & 1) - skb_pull(skb, 2); -#endif -#ifndef final_version - if (tp->rx_buffers[entry].mapping != - le32_to_cpu(tp->rx_ring[entry].buffer1)) { - dev_err(&dev->dev, - "Internal fault: The skbuff addresses do not match in tulip_rx: %08x vs. %08llx %p / %p\n", - le32_to_cpu(tp->rx_ring[entry].buffer1), - (unsigned long long)tp->rx_buffers[entry].mapping, - skb->head, temp); - } -#endif - - tp->rx_buffers[entry].skb = NULL; - tp->rx_buffers[entry].mapping = 0; - skb->protocol = eth_type_trans(skb, dev); - - netif_receive_skb(skb); - - tp->stats.rx_packets++; - tp->stats.rx_bytes += pkt_len; - } - entry = (++tp->cur_rx) % RX_RING_SIZE; - if (tp->cur_rx - tp->dirty_rx > RX_RING_SIZE/4) - tulip_refill_rx(dev); - - } - - /* New ack strategy... irq does not ack Rx any longer - hopefully this helps */ - - /* Really bad things can happen here... If new packet arrives - * and an irq arrives (tx or just due to occasionally unset - * mask), it will be acked by irq handler, but new thread - * is not scheduled. It is major hole in design. - * No idea how to fix this if "playing with fire" will fail - * tomorrow (night 011029). If it will not fail, we won - * finally: amount of IO did not increase at all. */ - } while ((ioread32(tp->base_addr + CSR5) & RxIntr)); - - tulip_refill_rx(dev); - - /* If RX ring is not full we are out of memory. */ - if (tp->rx_buffers[tp->dirty_rx % RX_RING_SIZE].skb == NULL) - goto oom; - - /* Remove us from polling list and enable RX intr. */ - napi_complete(napi); - iowrite32(VALID_INTR, tp->base_addr+CSR7); - - /* The last op happens after poll completion. Which means the following: - * 1. it can race with disabling irqs in irq handler - * 2. it can race with dise/enabling irqs in other poll threads - * 3. if an irq raised after beginning loop, it will be immediately - * triggered here. - * - * Summarizing: the logic results in some redundant irqs both - * due to races in masking and due to too late acking of already - * processed irqs. But it must not result in losing events. - */ - - return work_done; - - not_done: - if (tp->cur_rx - tp->dirty_rx > RX_RING_SIZE/2 || - tp->rx_buffers[tp->dirty_rx % RX_RING_SIZE].skb == NULL) - tulip_refill_rx(dev); - - if (tp->rx_buffers[tp->dirty_rx % RX_RING_SIZE].skb == NULL) - goto oom; - - return work_done; - - oom: /* Executed with RX ints disabled */ - - /* Start timer, stop polling, but do not enable rx interrupts. */ - mod_timer(&tp->oom_timer, jiffies+1); - - /* Think: timer_pending() was an explicit signature of bug. - * Timer can be pending now but fired and completed - * before we did napi_complete(). See? We would lose it. */ - - /* remove ourselves from the polling list */ - napi_complete(napi); - - return work_done; -} - -/* The interrupt handler does all of the Rx thread work and cleans up - after the Tx thread. */ -irqreturn_t tulip_interrupt(int irq, void *dev_instance) -{ - struct net_device *dev = (struct net_device *)dev_instance; - struct tulip_private *tp = netdev_priv(dev); - void __iomem *ioaddr = tp->base_addr; - int csr5; - int missed; - int rx = 0; - int tx = 0; - int oi = 0; - int maxrx = RX_RING_SIZE; - int maxtx = TX_RING_SIZE; - int maxoi = TX_RING_SIZE; - int rxd = 0; - unsigned int work_count = 25; - unsigned int handled = 0; - - /* Let's see whether the interrupt really is for us */ - csr5 = ioread32(ioaddr + CSR5); - - if ((csr5 & (NormalIntr|AbnormalIntr)) == 0) - return IRQ_RETVAL(handled); - - tp->nir++; - - do { - - if (!rxd && (csr5 & (RxIntr | RxNoBuf))) { - rxd++; - /* Mask RX intrs and add the device to poll list. */ - iowrite32(VALID_INTR&~RxPollInt, ioaddr + CSR7); - napi_schedule(&tp->napi); - - if (!(csr5&~(AbnormalIntr|NormalIntr|RxPollInt|TPLnkPass))) - break; - } - - /* Acknowledge the interrupt sources we handle here ASAP - the poll function does Rx and RxNoBuf acking */ - - iowrite32(csr5 & 0x0001ff3f, ioaddr + CSR5); - - if (tulip_debug > 4) - printk(KERN_DEBUG "%s: interrupt csr5=%#8.8x new csr5=%#8.8x\n", - dev->name, csr5, ioread32(ioaddr + CSR5)); - - - if (csr5 & (TxNoBuf | TxDied | TxIntr | TimerInt)) { - unsigned int dirty_tx; - - spin_lock(&tp->lock); - - for (dirty_tx = tp->dirty_tx; tp->cur_tx - dirty_tx > 0; - dirty_tx++) { - int entry = dirty_tx % TX_RING_SIZE; - int status = le32_to_cpu(tp->tx_ring[entry].status); - - if (status < 0) - break; /* It still has not been Txed */ - - if (status & 0x8000) { - /* There was an major error, log it. */ -#ifndef final_version - if (tulip_debug > 1) - printk(KERN_DEBUG "%s: Transmit error, Tx status %08x\n", - dev->name, status); -#endif - tp->stats.tx_errors++; - if (status & 0x4104) tp->stats.tx_aborted_errors++; - if (status & 0x0C00) tp->stats.tx_carrier_errors++; - if (status & 0x0200) tp->stats.tx_window_errors++; - if (status & 0x0002) tp->stats.tx_fifo_errors++; - if (status & 0x0080) tp->stats.tx_heartbeat_errors++; - } else { - tp->stats.tx_bytes += - tp->tx_buffers[entry].skb->len; - tp->stats.collisions += (status >> 3) & 15; - tp->stats.tx_packets++; - } - - dma_unmap_single(&tp->pdev->dev, tp->tx_buffers[entry].mapping, - tp->tx_buffers[entry].skb->len, DMA_TO_DEVICE); - /* Free the original skb. */ - dev_kfree_skb_irq(tp->tx_buffers[entry].skb); - tp->tx_buffers[entry].skb = NULL; - tp->tx_buffers[entry].mapping = 0; - tx++; - } - -#ifndef final_version - if (tp->cur_tx - dirty_tx > TX_RING_SIZE) { - dev_err(&dev->dev, - "Out-of-sync dirty pointer, %d vs. %d\n", - dirty_tx, tp->cur_tx); - dirty_tx += TX_RING_SIZE; - } -#endif - - if (tp->cur_tx - dirty_tx < TX_RING_SIZE - 2) - netif_wake_queue(dev); - - tp->dirty_tx = dirty_tx; - if (csr5 & TxDied) { - if (tulip_debug > 2) - dev_warn(&dev->dev, - "The transmitter stopped. CSR5 is %x, CSR6 %x, new CSR6 %x\n", - csr5, ioread32(ioaddr + CSR6), - tp->csr6); - tulip_restart_rxtx(tp); - } - spin_unlock(&tp->lock); - } - - /* Log errors. */ - if (csr5 & AbnormalIntr) { /* Abnormal error summary bit. */ - if (csr5 == 0xffffffff) - break; - if (csr5 & TxJabber) tp->stats.tx_errors++; - if (csr5 & TxFIFOUnderflow) { - if ((tp->csr6 & 0xC000) != 0xC000) - tp->csr6 += 0x4000; /* Bump up the Tx threshold */ - else - tp->csr6 |= 0x00200000; /* Store-n-forward. */ - /* Restart the transmit process. */ - tulip_restart_rxtx(tp); - iowrite32(0, ioaddr + CSR1); - } - if (csr5 & (RxDied | RxNoBuf)) { - iowrite32(tp->mc_filter[0], ioaddr + CSR27); - iowrite32(tp->mc_filter[1], ioaddr + CSR28); - } - if (csr5 & RxDied) { /* Missed a Rx frame. */ - tp->stats.rx_missed_errors += ioread32(ioaddr + CSR8) & 0xffff; - tp->stats.rx_errors++; - tulip_start_rxtx(tp); - } - /* - * NB: t21142_lnk_change() does a del_timer_sync(), so be careful if this - * call is ever done under the spinlock - */ - if (csr5 & (TPLnkPass | TPLnkFail | 0x08000000)) { - if (tp->link_change) - (tp->link_change)(dev, csr5); - } - if (csr5 & SystemError) { - int error = (csr5 >> 23) & 7; - /* oops, we hit a PCI error. The code produced corresponds - * to the reason: - * 0 - parity error - * 1 - master abort - * 2 - target abort - * Note that on parity error, we should do a software reset - * of the chip to get it back into a sane state (according - * to the 21142/3 docs that is). - * -- rmk - */ - dev_err(&dev->dev, - "(%lu) System Error occurred (%d)\n", - tp->nir, error); - } - /* Clear all error sources, included undocumented ones! */ - iowrite32(0x0800f7ba, ioaddr + CSR5); - oi++; - } - if (csr5 & TimerInt) { - - if (tulip_debug > 2) - dev_err(&dev->dev, - "Re-enabling interrupts, %08x\n", - csr5); - iowrite32(VALID_INTR, ioaddr + CSR7); - oi++; - } - if (tx > maxtx || rx > maxrx || oi > maxoi) { - if (tulip_debug > 1) - dev_warn(&dev->dev, "Too much work during an interrupt, csr5=0x%08x. (%lu) (%d,%d,%d)\n", - csr5, tp->nir, tx, rx, oi); - - /* Acknowledge all interrupt sources. */ - iowrite32(0x8001ffff, ioaddr + CSR5); - /* Mask all interrupting sources, set timer to - re-enable. */ - iowrite32(((~csr5) & 0x0001ebef) | AbnormalIntr | TimerInt, ioaddr + CSR7); - iowrite32(0x0012, ioaddr + CSR11); - break; - } - - work_count--; - if (work_count == 0) - break; - - csr5 = ioread32(ioaddr + CSR5); - - if (rxd) - csr5 &= ~RxPollInt; - } while ((csr5 & (TxNoBuf | - TxDied | - TxIntr | - TimerInt | - /* Abnormal intr. */ - RxDied | - TxFIFOUnderflow | - TxJabber | - TPLnkFail | - SystemError )) != 0); - - if ((missed = ioread32(ioaddr + CSR8) & 0x1ffff)) { - tp->stats.rx_dropped += missed & 0x10000 ? 0x10000 : missed; - } - - if (tulip_debug > 4) - printk(KERN_DEBUG "%s: exiting interrupt, csr5=%#04x\n", - dev->name, ioread32(ioaddr + CSR5)); - - return IRQ_HANDLED; -} |