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path: root/drivers/net/ethernet/ibm/emac/mal.c
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Diffstat (limited to 'drivers/net/ethernet/ibm/emac/mal.c')
-rw-r--r--drivers/net/ethernet/ibm/emac/mal.c809
1 files changed, 809 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ibm/emac/mal.c b/drivers/net/ethernet/ibm/emac/mal.c
new file mode 100644
index 000000000000..d268f404b7b0
--- /dev/null
+++ b/drivers/net/ethernet/ibm/emac/mal.c
@@ -0,0 +1,809 @@
+/*
+ * drivers/net/ibm_newemac/mal.c
+ *
+ * Memory Access Layer (MAL) support
+ *
+ * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Based on the arch/ppc version of the driver:
+ *
+ * Copyright (c) 2004, 2005 Zultys Technologies.
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *
+ * Based on original work by
+ * Benjamin Herrenschmidt <benh@kernel.crashing.org>,
+ * David Gibson <hermes@gibson.dropbear.id.au>,
+ *
+ * Armin Kuster <akuster@mvista.com>
+ * Copyright 2002 MontaVista Softare Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include <asm/dcr-regs.h>
+
+static int mal_count;
+
+int __devinit mal_register_commac(struct mal_instance *mal,
+ struct mal_commac *commac)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mal->lock, flags);
+
+ MAL_DBG(mal, "reg(%08x, %08x)" NL,
+ commac->tx_chan_mask, commac->rx_chan_mask);
+
+ /* Don't let multiple commacs claim the same channel(s) */
+ if ((mal->tx_chan_mask & commac->tx_chan_mask) ||
+ (mal->rx_chan_mask & commac->rx_chan_mask)) {
+ spin_unlock_irqrestore(&mal->lock, flags);
+ printk(KERN_WARNING "mal%d: COMMAC channels conflict!\n",
+ mal->index);
+ return -EBUSY;
+ }
+
+ if (list_empty(&mal->list))
+ napi_enable(&mal->napi);
+ mal->tx_chan_mask |= commac->tx_chan_mask;
+ mal->rx_chan_mask |= commac->rx_chan_mask;
+ list_add(&commac->list, &mal->list);
+
+ spin_unlock_irqrestore(&mal->lock, flags);
+
+ return 0;
+}
+
+void mal_unregister_commac(struct mal_instance *mal,
+ struct mal_commac *commac)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mal->lock, flags);
+
+ MAL_DBG(mal, "unreg(%08x, %08x)" NL,
+ commac->tx_chan_mask, commac->rx_chan_mask);
+
+ mal->tx_chan_mask &= ~commac->tx_chan_mask;
+ mal->rx_chan_mask &= ~commac->rx_chan_mask;
+ list_del_init(&commac->list);
+ if (list_empty(&mal->list))
+ napi_disable(&mal->napi);
+
+ spin_unlock_irqrestore(&mal->lock, flags);
+}
+
+int mal_set_rcbs(struct mal_instance *mal, int channel, unsigned long size)
+{
+ BUG_ON(channel < 0 || channel >= mal->num_rx_chans ||
+ size > MAL_MAX_RX_SIZE);
+
+ MAL_DBG(mal, "set_rbcs(%d, %lu)" NL, channel, size);
+
+ if (size & 0xf) {
+ printk(KERN_WARNING
+ "mal%d: incorrect RX size %lu for the channel %d\n",
+ mal->index, size, channel);
+ return -EINVAL;
+ }
+
+ set_mal_dcrn(mal, MAL_RCBS(channel), size >> 4);
+ return 0;
+}
+
+int mal_tx_bd_offset(struct mal_instance *mal, int channel)
+{
+ BUG_ON(channel < 0 || channel >= mal->num_tx_chans);
+
+ return channel * NUM_TX_BUFF;
+}
+
+int mal_rx_bd_offset(struct mal_instance *mal, int channel)
+{
+ BUG_ON(channel < 0 || channel >= mal->num_rx_chans);
+ return mal->num_tx_chans * NUM_TX_BUFF + channel * NUM_RX_BUFF;
+}
+
+void mal_enable_tx_channel(struct mal_instance *mal, int channel)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mal->lock, flags);
+
+ MAL_DBG(mal, "enable_tx(%d)" NL, channel);
+
+ set_mal_dcrn(mal, MAL_TXCASR,
+ get_mal_dcrn(mal, MAL_TXCASR) | MAL_CHAN_MASK(channel));
+
+ spin_unlock_irqrestore(&mal->lock, flags);
+}
+
+void mal_disable_tx_channel(struct mal_instance *mal, int channel)
+{
+ set_mal_dcrn(mal, MAL_TXCARR, MAL_CHAN_MASK(channel));
+
+ MAL_DBG(mal, "disable_tx(%d)" NL, channel);
+}
+
+void mal_enable_rx_channel(struct mal_instance *mal, int channel)
+{
+ unsigned long flags;
+
+ /*
+ * On some 4xx PPC's (e.g. 460EX/GT), the rx channel is a multiple
+ * of 8, but enabling in MAL_RXCASR needs the divided by 8 value
+ * for the bitmask
+ */
+ if (!(channel % 8))
+ channel >>= 3;
+
+ spin_lock_irqsave(&mal->lock, flags);
+
+ MAL_DBG(mal, "enable_rx(%d)" NL, channel);
+
+ set_mal_dcrn(mal, MAL_RXCASR,
+ get_mal_dcrn(mal, MAL_RXCASR) | MAL_CHAN_MASK(channel));
+
+ spin_unlock_irqrestore(&mal->lock, flags);
+}
+
+void mal_disable_rx_channel(struct mal_instance *mal, int channel)
+{
+ /*
+ * On some 4xx PPC's (e.g. 460EX/GT), the rx channel is a multiple
+ * of 8, but enabling in MAL_RXCASR needs the divided by 8 value
+ * for the bitmask
+ */
+ if (!(channel % 8))
+ channel >>= 3;
+
+ set_mal_dcrn(mal, MAL_RXCARR, MAL_CHAN_MASK(channel));
+
+ MAL_DBG(mal, "disable_rx(%d)" NL, channel);
+}
+
+void mal_poll_add(struct mal_instance *mal, struct mal_commac *commac)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mal->lock, flags);
+
+ MAL_DBG(mal, "poll_add(%p)" NL, commac);
+
+ /* starts disabled */
+ set_bit(MAL_COMMAC_POLL_DISABLED, &commac->flags);
+
+ list_add_tail(&commac->poll_list, &mal->poll_list);
+
+ spin_unlock_irqrestore(&mal->lock, flags);
+}
+
+void mal_poll_del(struct mal_instance *mal, struct mal_commac *commac)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mal->lock, flags);
+
+ MAL_DBG(mal, "poll_del(%p)" NL, commac);
+
+ list_del(&commac->poll_list);
+
+ spin_unlock_irqrestore(&mal->lock, flags);
+}
+
+/* synchronized by mal_poll() */
+static inline void mal_enable_eob_irq(struct mal_instance *mal)
+{
+ MAL_DBG2(mal, "enable_irq" NL);
+
+ // XXX might want to cache MAL_CFG as the DCR read can be slooooow
+ set_mal_dcrn(mal, MAL_CFG, get_mal_dcrn(mal, MAL_CFG) | MAL_CFG_EOPIE);
+}
+
+/* synchronized by NAPI state */
+static inline void mal_disable_eob_irq(struct mal_instance *mal)
+{
+ // XXX might want to cache MAL_CFG as the DCR read can be slooooow
+ set_mal_dcrn(mal, MAL_CFG, get_mal_dcrn(mal, MAL_CFG) & ~MAL_CFG_EOPIE);
+
+ MAL_DBG2(mal, "disable_irq" NL);
+}
+
+static irqreturn_t mal_serr(int irq, void *dev_instance)
+{
+ struct mal_instance *mal = dev_instance;
+
+ u32 esr = get_mal_dcrn(mal, MAL_ESR);
+
+ /* Clear the error status register */
+ set_mal_dcrn(mal, MAL_ESR, esr);
+
+ MAL_DBG(mal, "SERR %08x" NL, esr);
+
+ if (esr & MAL_ESR_EVB) {
+ if (esr & MAL_ESR_DE) {
+ /* We ignore Descriptor error,
+ * TXDE or RXDE interrupt will be generated anyway.
+ */
+ return IRQ_HANDLED;
+ }
+
+ if (esr & MAL_ESR_PEIN) {
+ /* PLB error, it's probably buggy hardware or
+ * incorrect physical address in BD (i.e. bug)
+ */
+ if (net_ratelimit())
+ printk(KERN_ERR
+ "mal%d: system error, "
+ "PLB (ESR = 0x%08x)\n",
+ mal->index, esr);
+ return IRQ_HANDLED;
+ }
+
+ /* OPB error, it's probably buggy hardware or incorrect
+ * EBC setup
+ */
+ if (net_ratelimit())
+ printk(KERN_ERR
+ "mal%d: system error, OPB (ESR = 0x%08x)\n",
+ mal->index, esr);
+ }
+ return IRQ_HANDLED;
+}
+
+static inline void mal_schedule_poll(struct mal_instance *mal)
+{
+ if (likely(napi_schedule_prep(&mal->napi))) {
+ MAL_DBG2(mal, "schedule_poll" NL);
+ mal_disable_eob_irq(mal);
+ __napi_schedule(&mal->napi);
+ } else
+ MAL_DBG2(mal, "already in poll" NL);
+}
+
+static irqreturn_t mal_txeob(int irq, void *dev_instance)
+{
+ struct mal_instance *mal = dev_instance;
+
+ u32 r = get_mal_dcrn(mal, MAL_TXEOBISR);
+
+ MAL_DBG2(mal, "txeob %08x" NL, r);
+
+ mal_schedule_poll(mal);
+ set_mal_dcrn(mal, MAL_TXEOBISR, r);
+
+#ifdef CONFIG_PPC_DCR_NATIVE
+ if (mal_has_feature(mal, MAL_FTR_CLEAR_ICINTSTAT))
+ mtdcri(SDR0, DCRN_SDR_ICINTSTAT,
+ (mfdcri(SDR0, DCRN_SDR_ICINTSTAT) | ICINTSTAT_ICTX));
+#endif
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t mal_rxeob(int irq, void *dev_instance)
+{
+ struct mal_instance *mal = dev_instance;
+
+ u32 r = get_mal_dcrn(mal, MAL_RXEOBISR);
+
+ MAL_DBG2(mal, "rxeob %08x" NL, r);
+
+ mal_schedule_poll(mal);
+ set_mal_dcrn(mal, MAL_RXEOBISR, r);
+
+#ifdef CONFIG_PPC_DCR_NATIVE
+ if (mal_has_feature(mal, MAL_FTR_CLEAR_ICINTSTAT))
+ mtdcri(SDR0, DCRN_SDR_ICINTSTAT,
+ (mfdcri(SDR0, DCRN_SDR_ICINTSTAT) | ICINTSTAT_ICRX));
+#endif
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t mal_txde(int irq, void *dev_instance)
+{
+ struct mal_instance *mal = dev_instance;
+
+ u32 deir = get_mal_dcrn(mal, MAL_TXDEIR);
+ set_mal_dcrn(mal, MAL_TXDEIR, deir);
+
+ MAL_DBG(mal, "txde %08x" NL, deir);
+
+ if (net_ratelimit())
+ printk(KERN_ERR
+ "mal%d: TX descriptor error (TXDEIR = 0x%08x)\n",
+ mal->index, deir);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t mal_rxde(int irq, void *dev_instance)
+{
+ struct mal_instance *mal = dev_instance;
+ struct list_head *l;
+
+ u32 deir = get_mal_dcrn(mal, MAL_RXDEIR);
+
+ MAL_DBG(mal, "rxde %08x" NL, deir);
+
+ list_for_each(l, &mal->list) {
+ struct mal_commac *mc = list_entry(l, struct mal_commac, list);
+ if (deir & mc->rx_chan_mask) {
+ set_bit(MAL_COMMAC_RX_STOPPED, &mc->flags);
+ mc->ops->rxde(mc->dev);
+ }
+ }
+
+ mal_schedule_poll(mal);
+ set_mal_dcrn(mal, MAL_RXDEIR, deir);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t mal_int(int irq, void *dev_instance)
+{
+ struct mal_instance *mal = dev_instance;
+ u32 esr = get_mal_dcrn(mal, MAL_ESR);
+
+ if (esr & MAL_ESR_EVB) {
+ /* descriptor error */
+ if (esr & MAL_ESR_DE) {
+ if (esr & MAL_ESR_CIDT)
+ return mal_rxde(irq, dev_instance);
+ else
+ return mal_txde(irq, dev_instance);
+ } else { /* SERR */
+ return mal_serr(irq, dev_instance);
+ }
+ }
+ return IRQ_HANDLED;
+}
+
+void mal_poll_disable(struct mal_instance *mal, struct mal_commac *commac)
+{
+ /* Spinlock-type semantics: only one caller disable poll at a time */
+ while (test_and_set_bit(MAL_COMMAC_POLL_DISABLED, &commac->flags))
+ msleep(1);
+
+ /* Synchronize with the MAL NAPI poller */
+ napi_synchronize(&mal->napi);
+}
+
+void mal_poll_enable(struct mal_instance *mal, struct mal_commac *commac)
+{
+ smp_wmb();
+ clear_bit(MAL_COMMAC_POLL_DISABLED, &commac->flags);
+
+ /* Feels better to trigger a poll here to catch up with events that
+ * may have happened on this channel while disabled. It will most
+ * probably be delayed until the next interrupt but that's mostly a
+ * non-issue in the context where this is called.
+ */
+ napi_schedule(&mal->napi);
+}
+
+static int mal_poll(struct napi_struct *napi, int budget)
+{
+ struct mal_instance *mal = container_of(napi, struct mal_instance, napi);
+ struct list_head *l;
+ int received = 0;
+ unsigned long flags;
+
+ MAL_DBG2(mal, "poll(%d)" NL, budget);
+ again:
+ /* Process TX skbs */
+ list_for_each(l, &mal->poll_list) {
+ struct mal_commac *mc =
+ list_entry(l, struct mal_commac, poll_list);
+ mc->ops->poll_tx(mc->dev);
+ }
+
+ /* Process RX skbs.
+ *
+ * We _might_ need something more smart here to enforce polling
+ * fairness.
+ */
+ list_for_each(l, &mal->poll_list) {
+ struct mal_commac *mc =
+ list_entry(l, struct mal_commac, poll_list);
+ int n;
+ if (unlikely(test_bit(MAL_COMMAC_POLL_DISABLED, &mc->flags)))
+ continue;
+ n = mc->ops->poll_rx(mc->dev, budget);
+ if (n) {
+ received += n;
+ budget -= n;
+ if (budget <= 0)
+ goto more_work; // XXX What if this is the last one ?
+ }
+ }
+
+ /* We need to disable IRQs to protect from RXDE IRQ here */
+ spin_lock_irqsave(&mal->lock, flags);
+ __napi_complete(napi);
+ mal_enable_eob_irq(mal);
+ spin_unlock_irqrestore(&mal->lock, flags);
+
+ /* Check for "rotting" packet(s) */
+ list_for_each(l, &mal->poll_list) {
+ struct mal_commac *mc =
+ list_entry(l, struct mal_commac, poll_list);
+ if (unlikely(test_bit(MAL_COMMAC_POLL_DISABLED, &mc->flags)))
+ continue;
+ if (unlikely(mc->ops->peek_rx(mc->dev) ||
+ test_bit(MAL_COMMAC_RX_STOPPED, &mc->flags))) {
+ MAL_DBG2(mal, "rotting packet" NL);
+ if (napi_reschedule(napi))
+ mal_disable_eob_irq(mal);
+ else
+ MAL_DBG2(mal, "already in poll list" NL);
+
+ if (budget > 0)
+ goto again;
+ else
+ goto more_work;
+ }
+ mc->ops->poll_tx(mc->dev);
+ }
+
+ more_work:
+ MAL_DBG2(mal, "poll() %d <- %d" NL, budget, received);
+ return received;
+}
+
+static void mal_reset(struct mal_instance *mal)
+{
+ int n = 10;
+
+ MAL_DBG(mal, "reset" NL);
+
+ set_mal_dcrn(mal, MAL_CFG, MAL_CFG_SR);
+
+ /* Wait for reset to complete (1 system clock) */
+ while ((get_mal_dcrn(mal, MAL_CFG) & MAL_CFG_SR) && n)
+ --n;
+
+ if (unlikely(!n))
+ printk(KERN_ERR "mal%d: reset timeout\n", mal->index);
+}
+
+int mal_get_regs_len(struct mal_instance *mal)
+{
+ return sizeof(struct emac_ethtool_regs_subhdr) +
+ sizeof(struct mal_regs);
+}
+
+void *mal_dump_regs(struct mal_instance *mal, void *buf)
+{
+ struct emac_ethtool_regs_subhdr *hdr = buf;
+ struct mal_regs *regs = (struct mal_regs *)(hdr + 1);
+ int i;
+
+ hdr->version = mal->version;
+ hdr->index = mal->index;
+
+ regs->tx_count = mal->num_tx_chans;
+ regs->rx_count = mal->num_rx_chans;
+
+ regs->cfg = get_mal_dcrn(mal, MAL_CFG);
+ regs->esr = get_mal_dcrn(mal, MAL_ESR);
+ regs->ier = get_mal_dcrn(mal, MAL_IER);
+ regs->tx_casr = get_mal_dcrn(mal, MAL_TXCASR);
+ regs->tx_carr = get_mal_dcrn(mal, MAL_TXCARR);
+ regs->tx_eobisr = get_mal_dcrn(mal, MAL_TXEOBISR);
+ regs->tx_deir = get_mal_dcrn(mal, MAL_TXDEIR);
+ regs->rx_casr = get_mal_dcrn(mal, MAL_RXCASR);
+ regs->rx_carr = get_mal_dcrn(mal, MAL_RXCARR);
+ regs->rx_eobisr = get_mal_dcrn(mal, MAL_RXEOBISR);
+ regs->rx_deir = get_mal_dcrn(mal, MAL_RXDEIR);
+
+ for (i = 0; i < regs->tx_count; ++i)
+ regs->tx_ctpr[i] = get_mal_dcrn(mal, MAL_TXCTPR(i));
+
+ for (i = 0; i < regs->rx_count; ++i) {
+ regs->rx_ctpr[i] = get_mal_dcrn(mal, MAL_RXCTPR(i));
+ regs->rcbs[i] = get_mal_dcrn(mal, MAL_RCBS(i));
+ }
+ return regs + 1;
+}
+
+static int __devinit mal_probe(struct platform_device *ofdev)
+{
+ struct mal_instance *mal;
+ int err = 0, i, bd_size;
+ int index = mal_count++;
+ unsigned int dcr_base;
+ const u32 *prop;
+ u32 cfg;
+ unsigned long irqflags;
+ irq_handler_t hdlr_serr, hdlr_txde, hdlr_rxde;
+
+ mal = kzalloc(sizeof(struct mal_instance), GFP_KERNEL);
+ if (!mal) {
+ printk(KERN_ERR
+ "mal%d: out of memory allocating MAL structure!\n",
+ index);
+ return -ENOMEM;
+ }
+ mal->index = index;
+ mal->ofdev = ofdev;
+ mal->version = of_device_is_compatible(ofdev->dev.of_node, "ibm,mcmal2") ? 2 : 1;
+
+ MAL_DBG(mal, "probe" NL);
+
+ prop = of_get_property(ofdev->dev.of_node, "num-tx-chans", NULL);
+ if (prop == NULL) {
+ printk(KERN_ERR
+ "mal%d: can't find MAL num-tx-chans property!\n",
+ index);
+ err = -ENODEV;
+ goto fail;
+ }
+ mal->num_tx_chans = prop[0];
+
+ prop = of_get_property(ofdev->dev.of_node, "num-rx-chans", NULL);
+ if (prop == NULL) {
+ printk(KERN_ERR
+ "mal%d: can't find MAL num-rx-chans property!\n",
+ index);
+ err = -ENODEV;
+ goto fail;
+ }
+ mal->num_rx_chans = prop[0];
+
+ dcr_base = dcr_resource_start(ofdev->dev.of_node, 0);
+ if (dcr_base == 0) {
+ printk(KERN_ERR
+ "mal%d: can't find DCR resource!\n", index);
+ err = -ENODEV;
+ goto fail;
+ }
+ mal->dcr_host = dcr_map(ofdev->dev.of_node, dcr_base, 0x100);
+ if (!DCR_MAP_OK(mal->dcr_host)) {
+ printk(KERN_ERR
+ "mal%d: failed to map DCRs !\n", index);
+ err = -ENODEV;
+ goto fail;
+ }
+
+ if (of_device_is_compatible(ofdev->dev.of_node, "ibm,mcmal-405ez")) {
+#if defined(CONFIG_IBM_NEW_EMAC_MAL_CLR_ICINTSTAT) && \
+ defined(CONFIG_IBM_NEW_EMAC_MAL_COMMON_ERR)
+ mal->features |= (MAL_FTR_CLEAR_ICINTSTAT |
+ MAL_FTR_COMMON_ERR_INT);
+#else
+ printk(KERN_ERR "%s: Support for 405EZ not enabled!\n",
+ ofdev->dev.of_node->full_name);
+ err = -ENODEV;
+ goto fail;
+#endif
+ }
+
+ mal->txeob_irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
+ mal->rxeob_irq = irq_of_parse_and_map(ofdev->dev.of_node, 1);
+ mal->serr_irq = irq_of_parse_and_map(ofdev->dev.of_node, 2);
+
+ if (mal_has_feature(mal, MAL_FTR_COMMON_ERR_INT)) {
+ mal->txde_irq = mal->rxde_irq = mal->serr_irq;
+ } else {
+ mal->txde_irq = irq_of_parse_and_map(ofdev->dev.of_node, 3);
+ mal->rxde_irq = irq_of_parse_and_map(ofdev->dev.of_node, 4);
+ }
+
+ if (mal->txeob_irq == NO_IRQ || mal->rxeob_irq == NO_IRQ ||
+ mal->serr_irq == NO_IRQ || mal->txde_irq == NO_IRQ ||
+ mal->rxde_irq == NO_IRQ) {
+ printk(KERN_ERR
+ "mal%d: failed to map interrupts !\n", index);
+ err = -ENODEV;
+ goto fail_unmap;
+ }
+
+ INIT_LIST_HEAD(&mal->poll_list);
+ INIT_LIST_HEAD(&mal->list);
+ spin_lock_init(&mal->lock);
+
+ init_dummy_netdev(&mal->dummy_dev);
+
+ netif_napi_add(&mal->dummy_dev, &mal->napi, mal_poll,
+ CONFIG_IBM_NEW_EMAC_POLL_WEIGHT);
+
+ /* Load power-on reset defaults */
+ mal_reset(mal);
+
+ /* Set the MAL configuration register */
+ cfg = (mal->version == 2) ? MAL2_CFG_DEFAULT : MAL1_CFG_DEFAULT;
+ cfg |= MAL_CFG_PLBB | MAL_CFG_OPBBL | MAL_CFG_LEA;
+
+ /* Current Axon is not happy with priority being non-0, it can
+ * deadlock, fix it up here
+ */
+ if (of_device_is_compatible(ofdev->dev.of_node, "ibm,mcmal-axon"))
+ cfg &= ~(MAL2_CFG_RPP_10 | MAL2_CFG_WPP_10);
+
+ /* Apply configuration */
+ set_mal_dcrn(mal, MAL_CFG, cfg);
+
+ /* Allocate space for BD rings */
+ BUG_ON(mal->num_tx_chans <= 0 || mal->num_tx_chans > 32);
+ BUG_ON(mal->num_rx_chans <= 0 || mal->num_rx_chans > 32);
+
+ bd_size = sizeof(struct mal_descriptor) *
+ (NUM_TX_BUFF * mal->num_tx_chans +
+ NUM_RX_BUFF * mal->num_rx_chans);
+ mal->bd_virt =
+ dma_alloc_coherent(&ofdev->dev, bd_size, &mal->bd_dma,
+ GFP_KERNEL);
+ if (mal->bd_virt == NULL) {
+ printk(KERN_ERR
+ "mal%d: out of memory allocating RX/TX descriptors!\n",
+ index);
+ err = -ENOMEM;
+ goto fail_unmap;
+ }
+ memset(mal->bd_virt, 0, bd_size);
+
+ for (i = 0; i < mal->num_tx_chans; ++i)
+ set_mal_dcrn(mal, MAL_TXCTPR(i), mal->bd_dma +
+ sizeof(struct mal_descriptor) *
+ mal_tx_bd_offset(mal, i));
+
+ for (i = 0; i < mal->num_rx_chans; ++i)
+ set_mal_dcrn(mal, MAL_RXCTPR(i), mal->bd_dma +
+ sizeof(struct mal_descriptor) *
+ mal_rx_bd_offset(mal, i));
+
+ if (mal_has_feature(mal, MAL_FTR_COMMON_ERR_INT)) {
+ irqflags = IRQF_SHARED;
+ hdlr_serr = hdlr_txde = hdlr_rxde = mal_int;
+ } else {
+ irqflags = 0;
+ hdlr_serr = mal_serr;
+ hdlr_txde = mal_txde;
+ hdlr_rxde = mal_rxde;
+ }
+
+ err = request_irq(mal->serr_irq, hdlr_serr, irqflags, "MAL SERR", mal);
+ if (err)
+ goto fail2;
+ err = request_irq(mal->txde_irq, hdlr_txde, irqflags, "MAL TX DE", mal);
+ if (err)
+ goto fail3;
+ err = request_irq(mal->txeob_irq, mal_txeob, 0, "MAL TX EOB", mal);
+ if (err)
+ goto fail4;
+ err = request_irq(mal->rxde_irq, hdlr_rxde, irqflags, "MAL RX DE", mal);
+ if (err)
+ goto fail5;
+ err = request_irq(mal->rxeob_irq, mal_rxeob, 0, "MAL RX EOB", mal);
+ if (err)
+ goto fail6;
+
+ /* Enable all MAL SERR interrupt sources */
+ if (mal->version == 2)
+ set_mal_dcrn(mal, MAL_IER, MAL2_IER_EVENTS);
+ else
+ set_mal_dcrn(mal, MAL_IER, MAL1_IER_EVENTS);
+
+ /* Enable EOB interrupt */
+ mal_enable_eob_irq(mal);
+
+ printk(KERN_INFO
+ "MAL v%d %s, %d TX channels, %d RX channels\n",
+ mal->version, ofdev->dev.of_node->full_name,
+ mal->num_tx_chans, mal->num_rx_chans);
+
+ /* Advertise this instance to the rest of the world */
+ wmb();
+ dev_set_drvdata(&ofdev->dev, mal);
+
+ mal_dbg_register(mal);
+
+ return 0;
+
+ fail6:
+ free_irq(mal->rxde_irq, mal);
+ fail5:
+ free_irq(mal->txeob_irq, mal);
+ fail4:
+ free_irq(mal->txde_irq, mal);
+ fail3:
+ free_irq(mal->serr_irq, mal);
+ fail2:
+ dma_free_coherent(&ofdev->dev, bd_size, mal->bd_virt, mal->bd_dma);
+ fail_unmap:
+ dcr_unmap(mal->dcr_host, 0x100);
+ fail:
+ kfree(mal);
+
+ return err;
+}
+
+static int __devexit mal_remove(struct platform_device *ofdev)
+{
+ struct mal_instance *mal = dev_get_drvdata(&ofdev->dev);
+
+ MAL_DBG(mal, "remove" NL);
+
+ /* Synchronize with scheduled polling */
+ napi_disable(&mal->napi);
+
+ if (!list_empty(&mal->list)) {
+ /* This is *very* bad */
+ printk(KERN_EMERG
+ "mal%d: commac list is not empty on remove!\n",
+ mal->index);
+ WARN_ON(1);
+ }
+
+ dev_set_drvdata(&ofdev->dev, NULL);
+
+ free_irq(mal->serr_irq, mal);
+ free_irq(mal->txde_irq, mal);
+ free_irq(mal->txeob_irq, mal);
+ free_irq(mal->rxde_irq, mal);
+ free_irq(mal->rxeob_irq, mal);
+
+ mal_reset(mal);
+
+ mal_dbg_unregister(mal);
+
+ dma_free_coherent(&ofdev->dev,
+ sizeof(struct mal_descriptor) *
+ (NUM_TX_BUFF * mal->num_tx_chans +
+ NUM_RX_BUFF * mal->num_rx_chans), mal->bd_virt,
+ mal->bd_dma);
+ kfree(mal);
+
+ return 0;
+}
+
+static struct of_device_id mal_platform_match[] =
+{
+ {
+ .compatible = "ibm,mcmal",
+ },
+ {
+ .compatible = "ibm,mcmal2",
+ },
+ /* Backward compat */
+ {
+ .type = "mcmal-dma",
+ .compatible = "ibm,mcmal",
+ },
+ {
+ .type = "mcmal-dma",
+ .compatible = "ibm,mcmal2",
+ },
+ {},
+};
+
+static struct platform_driver mal_of_driver = {
+ .driver = {
+ .name = "mcmal",
+ .owner = THIS_MODULE,
+ .of_match_table = mal_platform_match,
+ },
+ .probe = mal_probe,
+ .remove = mal_remove,
+};
+
+int __init mal_init(void)
+{
+ return platform_driver_register(&mal_of_driver);
+}
+
+void mal_exit(void)
+{
+ platform_driver_unregister(&mal_of_driver);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 05:27:01 +0000