diff options
Diffstat (limited to 'drivers/staging/et131x/et131x_isr.c')
| -rw-r--r-- | drivers/staging/et131x/et131x_isr.c | 488 |
1 files changed, 488 insertions, 0 deletions
diff --git a/drivers/staging/et131x/et131x_isr.c b/drivers/staging/et131x/et131x_isr.c new file mode 100644 index 000000000000..00afad174a62 --- /dev/null +++ b/drivers/staging/et131x/et131x_isr.c @@ -0,0 +1,488 @@ +/* + * Agere Systems Inc. + * 10/100/1000 Base-T Ethernet Driver for the ET1301 and ET131x series MACs + * + * Copyright © 2005 Agere Systems Inc. + * All rights reserved. + * http://www.agere.com + * + *------------------------------------------------------------------------------ + * + * et131x_isr.c - File which contains the ISR, ISR handler, and related routines + * for processing interrupts from the device. + * + *------------------------------------------------------------------------------ + * + * SOFTWARE LICENSE + * + * This software is provided subject to the following terms and conditions, + * which you should read carefully before using the software. Using this + * software indicates your acceptance of these terms and conditions. If you do + * not agree with these terms and conditions, do not use the software. + * + * Copyright © 2005 Agere Systems Inc. + * All rights reserved. + * + * Redistribution and use in source or binary forms, with or without + * modifications, are permitted provided that the following conditions are met: + * + * . Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following Disclaimer as comments in the code as + * well as in the documentation and/or other materials provided with the + * distribution. + * + * . Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following Disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * . Neither the name of Agere Systems Inc. nor the names of the contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * Disclaimer + * + * THIS SOFTWARE IS PROVIDED “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. ANY + * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN + * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + */ + +#include "et131x_version.h" +#include "et131x_debug.h" +#include "et131x_defs.h" + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> + +#include <linux/sched.h> +#include <linux/ptrace.h> +#include <linux/slab.h> +#include <linux/ctype.h> +#include <linux/string.h> +#include <linux/timer.h> +#include <linux/interrupt.h> +#include <linux/in.h> +#include <linux/delay.h> +#include <asm/io.h> +#include <asm/system.h> +#include <asm/bitops.h> + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/if_arp.h> +#include <linux/ioport.h> + +#include "et1310_phy.h" +#include "et1310_pm.h" +#include "et1310_jagcore.h" +#include "et1310_mac.h" + +#include "et131x_adapter.h" + +/* Data for debugging facilities */ +#ifdef CONFIG_ET131X_DEBUG +extern dbg_info_t *et131x_dbginfo; +#endif /* CONFIG_ET131X_DEBUG */ + +/** + * et131x_isr - The Interrupt Service Routine for the driver. + * @irq: the IRQ on which the interrupt was received. + * @dev_id: device-specific info (here a pointer to a net_device struct) + * + * Returns a value indicating if the interrupt was handled. + */ +irqreturn_t et131x_isr(int irq, void *dev_id) +{ + bool handled = true; + struct net_device *netdev = (struct net_device *)dev_id; + struct et131x_adapter *adapter = NULL; + INTERRUPT_t status; + + if (netdev == NULL || !netif_device_present(netdev)) { + DBG_WARNING(et131x_dbginfo, + "No net_device struct or device not present\n"); + handled = false; + goto out; + } + + adapter = netdev_priv(netdev); + + /* If the adapter is in low power state, then it should not + * recognize any interrupt + */ + + /* Disable Device Interrupts */ + et131x_disable_interrupts(adapter); + + /* Get a copy of the value in the interrupt status register + * so we can process the interrupting section + */ + status.value = readl(&adapter->CSRAddress->global.int_status.value); + + if (adapter->FlowControl == TxOnly || + adapter->FlowControl == Both) { + status.value &= ~INT_MASK_ENABLE; + } else { + status.value &= ~INT_MASK_ENABLE_NO_FLOW; + } + + /* Make sure this is our interrupt */ + if (!status.value) { +#ifdef CONFIG_ET131X_DEBUG + adapter->Stats.UnhandledInterruptsPerSec++; +#endif + handled = false; + DBG_VERBOSE(et131x_dbginfo, "NOT OUR INTERRUPT\n"); + et131x_enable_interrupts(adapter); + goto out; + } + + /* This is our interrupt, so process accordingly */ +#ifdef CONFIG_ET131X_DEBUG + if (status.bits.rxdma_xfr_done) { + adapter->Stats.RxDmaInterruptsPerSec++; + } + + if (status.bits.txdma_isr) { + adapter->Stats.TxDmaInterruptsPerSec++; + } +#endif + + if (status.bits.watchdog_interrupt) { + PMP_TCB pMpTcb = adapter->TxRing.CurrSendHead; + + if (pMpTcb) { + if (++pMpTcb->PacketStaleCount > 1) { + status.bits.txdma_isr = 1; + } + } + + if (adapter->RxRing.UnfinishedReceives) { + status.bits.rxdma_xfr_done = 1; + } else if (pMpTcb == NULL) { + writel(0, &adapter->CSRAddress->global.watchdog_timer); + } + + status.bits.watchdog_interrupt = 0; +#ifdef CONFIG_ET131X_DEBUG + adapter->Stats.WatchDogInterruptsPerSec++; +#endif + } + + if (status.value == 0) { + /* This interrupt has in some way been "handled" by + * the ISR. Either it was a spurious Rx interrupt, or + * it was a Tx interrupt that has been filtered by + * the ISR. + */ + et131x_enable_interrupts(adapter); + goto out; + } + + /* We need to save the interrupt status value for use in our + * DPC. We will clear the software copy of that in that + * routine. + */ + adapter->Stats.InterruptStatus = status; + + /* Schedule the ISR handler as a bottom-half task in the + * kernel's tq_immediate queue, and mark the queue for + * execution + */ + schedule_work(&adapter->task); + +out: + return IRQ_RETVAL(handled); +} + +/** + * et131x_isr_handler - The ISR handler + * @p_adapter, a pointer to the device's private adapter structure + * + * scheduled to run in a deferred context by the ISR. This is where the ISR's + * work actually gets done. + */ +void et131x_isr_handler(struct work_struct *work) +{ + struct et131x_adapter *pAdapter = + container_of(work, struct et131x_adapter, task); + INTERRUPT_t GlobStatus = pAdapter->Stats.InterruptStatus; + ADDRESS_MAP_t __iomem *iomem = pAdapter->CSRAddress; + + /* + * These first two are by far the most common. Once handled, we clear + * their two bits in the status word. If the word is now zero, we + * exit. + */ + /* Handle all the completed Transmit interrupts */ + if (GlobStatus.bits.txdma_isr) { + DBG_TX(et131x_dbginfo, "TXDMA_ISR interrupt\n"); + et131x_handle_send_interrupt(pAdapter); + } + + /* Handle all the completed Receives interrupts */ + if (GlobStatus.bits.rxdma_xfr_done) { + DBG_RX(et131x_dbginfo, "RXDMA_XFR_DONE interrupt\n"); + et131x_handle_recv_interrupt(pAdapter); + } + + GlobStatus.value &= 0xffffffd7; + + if (GlobStatus.value) { + /* Handle the TXDMA Error interrupt */ + if (GlobStatus.bits.txdma_err) { + TXDMA_ERROR_t TxDmaErr; + + /* Following read also clears the register (COR) */ + TxDmaErr.value = readl(&iomem->txdma.TxDmaError.value); + + DBG_WARNING(et131x_dbginfo, + "TXDMA_ERR interrupt, error = %d\n", + TxDmaErr.value); + } + + /* Handle Free Buffer Ring 0 and 1 Low interrupt */ + if (GlobStatus.bits.rxdma_fb_ring0_low || + GlobStatus.bits.rxdma_fb_ring1_low) { + /* + * This indicates the number of unused buffers in + * RXDMA free buffer ring 0 is <= the limit you + * programmed. Free buffer resources need to be + * returned. Free buffers are consumed as packets + * are passed from the network to the host. The host + * becomes aware of the packets from the contents of + * the packet status ring. This ring is queried when + * the packet done interrupt occurs. Packets are then + * passed to the OS. When the OS is done with the + * packets the resources can be returned to the + * ET1310 for re-use. This interrupt is one method of + * returning resources. + */ + DBG_WARNING(et131x_dbginfo, + "RXDMA_FB_RING0_LOW or " + "RXDMA_FB_RING1_LOW interrupt\n"); + + /* If the user has flow control on, then we will + * send a pause packet, otherwise just exit + */ + if (pAdapter->FlowControl == TxOnly || + pAdapter->FlowControl == Both) { + PM_CSR_t pm_csr; + + /* Tell the device to send a pause packet via + * the back pressure register + */ + pm_csr.value = readl(&iomem->global.pm_csr.value); + if (pm_csr.bits.pm_phy_sw_coma == 0) { + TXMAC_BP_CTRL_t bp_ctrl = { 0 }; + + bp_ctrl.bits.bp_req = 1; + bp_ctrl.bits.bp_xonxoff = 1; + writel(bp_ctrl.value, + &iomem->txmac.bp_ctrl.value); + } + } + } + + /* Handle Packet Status Ring Low Interrupt */ + if (GlobStatus.bits.rxdma_pkt_stat_ring_low) { + DBG_WARNING(et131x_dbginfo, + "RXDMA_PKT_STAT_RING_LOW interrupt\n"); + + /* + * Same idea as with the two Free Buffer Rings. + * Packets going from the network to the host each + * consume a free buffer resource and a packet status + * resource. These resoures are passed to the OS. + * When the OS is done with the resources, they need + * to be returned to the ET1310. This is one method + * of returning the resources. + */ + } + + /* Handle RXDMA Error Interrupt */ + if (GlobStatus.bits.rxdma_err) { + /* + * The rxdma_error interrupt is sent when a time-out + * on a request issued by the JAGCore has occurred or + * a completion is returned with an un-successful + * status. In both cases the request is considered + * complete. The JAGCore will automatically re-try the + * request in question. Normally information on events + * like these are sent to the host using the "Advanced + * Error Reporting" capability. This interrupt is + * another way of getting similar information. The + * only thing required is to clear the interrupt by + * reading the ISR in the global resources. The + * JAGCore will do a re-try on the request. Normally + * you should never see this interrupt. If you start + * to see this interrupt occurring frequently then + * something bad has occurred. A reset might be the + * thing to do. + */ + // TRAP(); + + pAdapter->TxMacTest.value = + readl(&iomem->txmac.tx_test.value); + DBG_WARNING(et131x_dbginfo, + "RxDMA_ERR interrupt, error %x\n", + pAdapter->TxMacTest.value); + } + + /* Handle the Wake on LAN Event */ + if (GlobStatus.bits.wake_on_lan) { + /* + * This is a secondary interrupt for wake on LAN. + * The driver should never see this, if it does, + * something serious is wrong. We will TRAP the + * message when we are in DBG mode, otherwise we + * will ignore it. + */ + DBG_ERROR(et131x_dbginfo, "WAKE_ON_LAN interrupt\n"); + } + + /* Handle the PHY interrupt */ + if (GlobStatus.bits.phy_interrupt) { + PM_CSR_t pm_csr; + MI_BMSR_t BmsrInts, BmsrData; + MI_ISR_t myIsr; + + DBG_VERBOSE(et131x_dbginfo, "PHY interrupt\n"); + + /* If we are in coma mode when we get this interrupt, + * we need to disable it. + */ + pm_csr.value = readl(&iomem->global.pm_csr.value); + if (pm_csr.bits.pm_phy_sw_coma == 1) { + /* + * Check to see if we are in coma mode and if + * so, disable it because we will not be able + * to read PHY values until we are out. + */ + DBG_VERBOSE(et131x_dbginfo, + "Device is in COMA mode, " + "need to wake up\n"); + DisablePhyComa(pAdapter); + } + + /* Read the PHY ISR to clear the reason for the + * interrupt. + */ + MiRead(pAdapter, (uint8_t) offsetof(MI_REGS_t, isr), + &myIsr.value); + + if (!pAdapter->ReplicaPhyLoopbk) { + MiRead(pAdapter, + (uint8_t) offsetof(MI_REGS_t, bmsr), + &BmsrData.value); + + BmsrInts.value = + pAdapter->Bmsr.value ^ BmsrData.value; + pAdapter->Bmsr.value = BmsrData.value; + + DBG_VERBOSE(et131x_dbginfo, + "Bmsr.value = 0x%04x," + "Bmsr_ints.value = 0x%04x\n", + BmsrData.value, BmsrInts.value); + + /* Do all the cable in / cable out stuff */ + et131x_Mii_check(pAdapter, BmsrData, BmsrInts); + } + } + + /* Let's move on to the TxMac */ + if (GlobStatus.bits.txmac_interrupt) { + pAdapter->TxRing.TxMacErr.value = + readl(&iomem->txmac.err.value); + + /* + * When any of the errors occur and TXMAC generates + * an interrupt to report these errors, it usually + * means that TXMAC has detected an error in the data + * stream retrieved from the on-chip Tx Q. All of + * these errors are catastrophic and TXMAC won't be + * able to recover data when these errors occur. In + * a nutshell, the whole Tx path will have to be reset + * and re-configured afterwards. + */ + DBG_WARNING(et131x_dbginfo, + "TXMAC interrupt, error 0x%08x\n", + pAdapter->TxRing.TxMacErr.value); + + /* If we are debugging, we want to see this error, + * otherwise we just want the device to be reset and + * continue + */ + //DBG_TRAP(); + } + + /* Handle RXMAC Interrupt */ + if (GlobStatus.bits.rxmac_interrupt) { + /* + * These interrupts are catastrophic to the device, + * what we need to do is disable the interrupts and + * set the flag to cause us to reset so we can solve + * this issue. + */ + // MP_SET_FLAG( pAdapter, fMP_ADAPTER_HARDWARE_ERROR ); + + DBG_WARNING(et131x_dbginfo, + "RXMAC interrupt, error 0x%08x. Requesting reset\n", + readl(&iomem->rxmac.err_reg.value)); + + DBG_WARNING(et131x_dbginfo, + "Enable 0x%08x, Diag 0x%08x\n", + readl(&iomem->rxmac.ctrl.value), + readl(&iomem->rxmac.rxq_diag.value)); + + /* + * If we are debugging, we want to see this error, + * otherwise we just want the device to be reset and + * continue + */ + // TRAP(); + } + + /* Handle MAC_STAT Interrupt */ + if (GlobStatus.bits.mac_stat_interrupt) { + /* + * This means at least one of the un-masked counters + * in the MAC_STAT block has rolled over. Use this + * to maintain the top, software managed bits of the + * counter(s). + */ + DBG_VERBOSE(et131x_dbginfo, "MAC_STAT interrupt\n"); + HandleMacStatInterrupt(pAdapter); + } + + /* Handle SLV Timeout Interrupt */ + if (GlobStatus.bits.slv_timeout) { + /* + * This means a timeout has occured on a read or + * write request to one of the JAGCore registers. The + * Global Resources block has terminated the request + * and on a read request, returned a "fake" value. + * The most likely reasons are: Bad Address or the + * addressed module is in a power-down state and + * can't respond. + */ + DBG_VERBOSE(et131x_dbginfo, "SLV_TIMEOUT interrupt\n"); + } + } + + if (pAdapter->PoMgmt.PowerState == NdisDeviceStateD0) { + et131x_enable_interrupts(pAdapter); + } +} |