hurricos/openwrt-mirror
1
0
Fork 0
mirror of git://git.openwrt.org/openwrt/openwrt.git synced 2025-10-31 05:54:26 -04:00
Code Issues Projects Releases Wiki Activity
e045e40671
openwrt-mirror/target/linux/ath25/patches-5.4/110-ar2313_ethernet.patch
Sergey Ryazanov ce3b135243 ath25: eth: fix crash on skb DMA (un-)map 
AR2315 Ethernet driver pass NULL instead of a real device pointer to DMA
(un-)map calls. With kernel version 5.4 such behaviour causes a kernel
panic. Fix this issue by preserving device pointer during the probe
procedure and pass it to each skb data DMA (un-)map call.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
2020-09-06 19:49:43 +02:00

1737 lines
48 KiB
Diff
Raw Blame History

--- a/drivers/net/ethernet/atheros/Makefile
+++ b/drivers/net/ethernet/atheros/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_ATL2) += atlx/
obj-$(CONFIG_ATL1E) += atl1e/
obj-$(CONFIG_ATL1C) += atl1c/
obj-$(CONFIG_ALX) += alx/
+obj-$(CONFIG_NET_AR231X) += ar231x/
--- a/drivers/net/ethernet/atheros/Kconfig
+++ b/drivers/net/ethernet/atheros/Kconfig
@@ -6,7 +6,7 @@
config NET_VENDOR_ATHEROS
bool "Atheros devices"
default y
- depends on (PCI || ATH79)
+ depends on (PCI || ATH25 || ATH79)
---help---
If you have a network (Ethernet) card belonging to this class, say Y.
@@ -87,4 +87,10 @@ config ALX
To compile this driver as a module, choose M here. The module
will be called alx.
+config NET_AR231X
+ tristate "Atheros AR231X built-in Ethernet support"
+ depends on ATH25
+ help
+ Support for the AR231x/531x ethernet controller
+
endif # NET_VENDOR_ATHEROS
--- /dev/null
+++ b/drivers/net/ethernet/atheros/ar231x/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_NET_AR231X) += ar231x.o
--- /dev/null
+++ b/drivers/net/ethernet/atheros/ar231x/ar231x.c
@@ -0,0 +1,1120 @@
+/*
+ * ar231x.c: Linux driver for the Atheros AR231x Ethernet device.
+ *
+ * Copyright (C) 2004 by Sameer Dekate <sdekate@arubanetworks.com>
+ * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2006-2009 Felix Fietkau <nbd@nbd.name>
+ *
+ * Thanks to Atheros for providing hardware and documentation
+ * enabling me to write this driver.
+ *
+ * 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.
+ *
+ * Additional credits:
+ * This code is taken from John Taylor's Sibyte driver and then
+ * modified for the AR2313.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/interrupt.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/mm.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#define AR2313_MTU 1692
+#define AR2313_PRIOS 1
+#define AR2313_QUEUES (2*AR2313_PRIOS)
+#define AR2313_DESCR_ENTRIES 64
+
+#ifndef min
+#define min(a, b) (((a) < (b)) ? (a) : (b))
+#endif
+
+#ifndef SMP_CACHE_BYTES
+#define SMP_CACHE_BYTES L1_CACHE_BYTES
+#endif
+
+#define AR2313_MBOX_SET_BIT 0x8
+
+#include "ar231x.h"
+
+/**
+ * New interrupt handler strategy:
+ *
+ * An old interrupt handler worked using the traditional method of
+ * replacing an skbuff with a new one when a packet arrives. However
+ * the rx rings do not need to contain a static number of buffer
+ * descriptors, thus it makes sense to move the memory allocation out
+ * of the main interrupt handler and do it in a bottom half handler
+ * and only allocate new buffers when the number of buffers in the
+ * ring is below a certain threshold. In order to avoid starving the
+ * NIC under heavy load it is however necessary to force allocation
+ * when hitting a minimum threshold. The strategy for alloction is as
+ * follows:
+ *
+ * RX_LOW_BUF_THRES - allocate buffers in the bottom half
+ * RX_PANIC_LOW_THRES - we are very low on buffers, allocate
+ * the buffers in the interrupt handler
+ * RX_RING_THRES - maximum number of buffers in the rx ring
+ *
+ * One advantagous side effect of this allocation approach is that the
+ * entire rx processing can be done without holding any spin lock
+ * since the rx rings and registers are totally independent of the tx
+ * ring and its registers. This of course includes the kmalloc's of
+ * new skb's. Thus start_xmit can run in parallel with rx processing
+ * and the memory allocation on SMP systems.
+ *
+ * Note that running the skb reallocation in a bottom half opens up
+ * another can of races which needs to be handled properly. In
+ * particular it can happen that the interrupt handler tries to run
+ * the reallocation while the bottom half is either running on another
+ * CPU or was interrupted on the same CPU. To get around this the
+ * driver uses bitops to prevent the reallocation routines from being
+ * reentered.
+ *
+ * TX handling can also be done without holding any spin lock, wheee
+ * this is fun! since tx_csm is only written to by the interrupt
+ * handler.
+ */
+
+/**
+ * Threshold values for RX buffer allocation - the low water marks for
+ * when to start refilling the rings are set to 75% of the ring
+ * sizes. It seems to make sense to refill the rings entirely from the
+ * intrrupt handler once it gets below the panic threshold, that way
+ * we don't risk that the refilling is moved to another CPU when the
+ * one running the interrupt handler just got the slab code hot in its
+ * cache.
+ */
+#define RX_RING_SIZE AR2313_DESCR_ENTRIES
+#define RX_PANIC_THRES (RX_RING_SIZE/4)
+#define RX_LOW_THRES ((3*RX_RING_SIZE)/4)
+#define CRC_LEN 4
+#define RX_OFFSET 2
+
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+#define VLAN_HDR 4
+#else
+#define VLAN_HDR 0
+#endif
+
+#define AR2313_BUFSIZE (AR2313_MTU + VLAN_HDR + ETH_HLEN + CRC_LEN + \
+ RX_OFFSET)
+
+#ifdef MODULE
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sameer Dekate <sdekate@arubanetworks.com>, Imre Kaloz <kaloz@openwrt.org>, Felix Fietkau <nbd@nbd.name>");
+MODULE_DESCRIPTION("AR231x Ethernet driver");
+#endif
+
+#define virt_to_phys(x) ((u32)(x) & 0x1fffffff)
+
+/* prototypes */
+static void ar231x_halt(struct net_device *dev);
+static void rx_tasklet_func(unsigned long data);
+static void rx_tasklet_cleanup(struct net_device *dev);
+static void ar231x_multicast_list(struct net_device *dev);
+static void ar231x_tx_timeout(struct net_device *dev);
+
+static int ar231x_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum);
+static int ar231x_mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
+ u16 value);
+static int ar231x_mdiobus_reset(struct mii_bus *bus);
+static int ar231x_mdiobus_probe(struct net_device *dev);
+static void ar231x_adjust_link(struct net_device *dev);
+
+#ifndef ERR
+#define ERR(fmt, args...) printk("%s: " fmt, __func__, ##args)
+#endif
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void
+ar231x_netpoll(struct net_device *dev)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ ar231x_interrupt(dev->irq, dev);
+ local_irq_restore(flags);
+}
+#endif
+
+static const struct net_device_ops ar231x_ops = {
+ .ndo_open = ar231x_open,
+ .ndo_stop = ar231x_close,
+ .ndo_start_xmit = ar231x_start_xmit,
+ .ndo_set_rx_mode = ar231x_multicast_list,
+ .ndo_do_ioctl = ar231x_ioctl,
+ .ndo_change_mtu = eth_change_mtu,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_tx_timeout = ar231x_tx_timeout,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = ar231x_netpoll,
+#endif
+};
+
+static int ar231x_probe(struct platform_device *pdev)
+{
+ struct net_device *dev;
+ struct ar231x_private *sp;
+ struct resource *res;
+ unsigned long ar_eth_base;
+ char buf[64];
+
+ dev = alloc_etherdev(sizeof(struct ar231x_private));
+
+ if (dev == NULL) {
+ printk(KERN_ERR
+ "ar231x: Unable to allocate net_device structure!\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, dev);
+
+ SET_NETDEV_DEV(dev, &pdev->dev);
+
+ sp = netdev_priv(dev);
+ sp->dev = dev;
+ sp->pdev = pdev;
+ sp->cfg = pdev->dev.platform_data;
+
+ sprintf(buf, "eth%d_membase", pdev->id);
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, buf);
+ if (!res)
+ return -ENODEV;
+
+ sp->link = 0;
+ ar_eth_base = res->start;
+
+ sprintf(buf, "eth%d_irq", pdev->id);
+ dev->irq = platform_get_irq_byname(pdev, buf);
+
+ spin_lock_init(&sp->lock);
+
+ dev->features |= NETIF_F_HIGHDMA;
+ dev->netdev_ops = &ar231x_ops;
+
+ tasklet_init(&sp->rx_tasklet, rx_tasklet_func, (unsigned long)dev);
+ tasklet_disable(&sp->rx_tasklet);
+
+ sp->eth_regs = ioremap_nocache(ar_eth_base, sizeof(*sp->eth_regs));
+ if (!sp->eth_regs) {
+ printk("Can't remap eth registers\n");
+ return -ENXIO;
+ }
+
+ /**
+ * When there's only one MAC, PHY regs are typically on ENET0,
+ * even though the MAC might be on ENET1.
+ * So remap PHY regs separately.
+ */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "eth0_mii");
+ if (!res) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "eth1_mii");
+ if (!res)
+ return -ENODEV;
+ }
+ sp->phy_regs = ioremap_nocache(res->start, resource_size(res));
+ if (!sp->phy_regs) {
+ printk("Can't remap phy registers\n");
+ return -ENXIO;
+ }
+
+ sp->dma_regs = ioremap_nocache(ar_eth_base + 0x1000,
+ sizeof(*sp->dma_regs));
+ if (!sp->dma_regs) {
+ printk("Can't remap DMA registers\n");
+ return -ENXIO;
+ }
+ dev->base_addr = ar_eth_base + 0x1000;
+
+ strncpy(sp->name, "Atheros AR231x", sizeof(sp->name) - 1);
+ sp->name[sizeof(sp->name) - 1] = '\0';
+ memcpy(dev->dev_addr, sp->cfg->macaddr, 6);
+
+ if (ar231x_init(dev)) {
+ /* ar231x_init() calls ar231x_init_cleanup() on error */
+ kfree(dev);
+ return -ENODEV;
+ }
+
+ if (register_netdev(dev)) {
+ printk("%s: register_netdev failed\n", __func__);
+ return -1;
+ }
+
+ printk("%s: %s: %pM, irq %d\n", dev->name, sp->name, dev->dev_addr,
+ dev->irq);
+
+ sp->mii_bus = mdiobus_alloc();
+ if (sp->mii_bus == NULL)
+ return -1;
+
+ sp->mii_bus->priv = dev;
+ sp->mii_bus->read = ar231x_mdiobus_read;
+ sp->mii_bus->write = ar231x_mdiobus_write;
+ sp->mii_bus->reset = ar231x_mdiobus_reset;
+ sp->mii_bus->name = "ar231x_eth_mii";
+ snprintf(sp->mii_bus->id, MII_BUS_ID_SIZE, "%d", pdev->id);
+
+ mdiobus_register(sp->mii_bus);
+
+ if (ar231x_mdiobus_probe(dev) != 0) {
+ printk(KERN_ERR "%s: mdiobus_probe failed\n", dev->name);
+ rx_tasklet_cleanup(dev);
+ ar231x_init_cleanup(dev);
+ unregister_netdev(dev);
+ kfree(dev);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void ar231x_multicast_list(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ unsigned int filter;
+
+ filter = sp->eth_regs->mac_control;
+
+ if (dev->flags & IFF_PROMISC)
+ filter |= MAC_CONTROL_PR;
+ else
+ filter &= ~MAC_CONTROL_PR;
+ if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 0))
+ filter |= MAC_CONTROL_PM;
+ else
+ filter &= ~MAC_CONTROL_PM;
+
+ sp->eth_regs->mac_control = filter;
+}
+
+static void rx_tasklet_cleanup(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+
+ /**
+ * Tasklet may be scheduled. Need to get it removed from the list
+ * since we're about to free the struct.
+ */
+
+ sp->unloading = 1;
+ tasklet_enable(&sp->rx_tasklet);
+ tasklet_kill(&sp->rx_tasklet);
+}
+
+static int ar231x_remove(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct ar231x_private *sp = netdev_priv(dev);
+
+ rx_tasklet_cleanup(dev);
+ ar231x_init_cleanup(dev);
+ unregister_netdev(dev);
+ mdiobus_unregister(sp->mii_bus);
+ mdiobus_free(sp->mii_bus);
+ kfree(dev);
+ return 0;
+}
+
+/**
+ * Restart the AR2313 ethernet controller.
+ */
+static int ar231x_restart(struct net_device *dev)
+{
+ /* disable interrupts */
+ disable_irq(dev->irq);
+
+ /* stop mac */
+ ar231x_halt(dev);
+
+ /* initialize */
+ ar231x_init(dev);
+
+ /* enable interrupts */
+ enable_irq(dev->irq);
+
+ return 0;
+}
+
+static struct platform_driver ar231x_driver = {
+ .driver.name = "ar231x-eth",
+ .probe = ar231x_probe,
+ .remove = ar231x_remove,
+};
+
+module_platform_driver(ar231x_driver);
+
+static void ar231x_free_descriptors(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+
+ if (sp->rx_ring != NULL) {
+ kfree((void *)KSEG0ADDR(sp->rx_ring));
+ sp->rx_ring = NULL;
+ sp->tx_ring = NULL;
+ }
+}
+
+static int ar231x_allocate_descriptors(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ int size;
+ int j;
+ ar231x_descr_t *space;
+
+ if (sp->rx_ring != NULL) {
+ printk("%s: already done.\n", __func__);
+ return 0;
+ }
+
+ size = sizeof(ar231x_descr_t) * (AR2313_DESCR_ENTRIES * AR2313_QUEUES);
+ space = kmalloc(size, GFP_KERNEL);
+ if (space == NULL)
+ return 1;
+
+ /* invalidate caches */
+ dma_cache_inv((unsigned int)space, size);
+
+ /* now convert pointer to KSEG1 */
+ space = (ar231x_descr_t *)KSEG1ADDR(space);
+
+ memset((void *)space, 0, size);
+
+ sp->rx_ring = space;
+ space += AR2313_DESCR_ENTRIES;
+
+ sp->tx_ring = space;
+ space += AR2313_DESCR_ENTRIES;
+
+ /* Initialize the transmit Descriptors */
+ for (j = 0; j < AR2313_DESCR_ENTRIES; j++) {
+ ar231x_descr_t *td = &sp->tx_ring[j];
+
+ td->status = 0;
+ td->devcs = DMA_TX1_CHAINED;
+ td->addr = 0;
+ td->descr = virt_to_phys(&sp->tx_ring[DSC_NEXT(j)]);
+ }
+
+ return 0;
+}
+
+/**
+ * Generic cleanup handling data allocated during init. Used when the
+ * module is unloaded or if an error occurs during initialization
+ */
+static void ar231x_init_cleanup(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ struct sk_buff *skb;
+ int j;
+
+ ar231x_free_descriptors(dev);
+
+ if (sp->eth_regs)
+ iounmap((void *)sp->eth_regs);
+ if (sp->dma_regs)
+ iounmap((void *)sp->dma_regs);
+ if (sp->phy_regs)
+ iounmap((void *)sp->phy_regs);
+
+ if (sp->rx_skb) {
+ for (j = 0; j < AR2313_DESCR_ENTRIES; j++) {
+ skb = sp->rx_skb[j];
+ if (skb) {
+ sp->rx_skb[j] = NULL;
+ dev_kfree_skb(skb);
+ }
+ }
+ kfree(sp->rx_skb);
+ sp->rx_skb = NULL;
+ }
+
+ if (sp->tx_skb) {
+ for (j = 0; j < AR2313_DESCR_ENTRIES; j++) {
+ skb = sp->tx_skb[j];
+ if (skb) {
+ sp->tx_skb[j] = NULL;
+ dev_kfree_skb(skb);
+ }
+ }
+ kfree(sp->tx_skb);
+ sp->tx_skb = NULL;
+ }
+}
+
+static int ar231x_reset_reg(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ unsigned int ethsal, ethsah;
+ unsigned int flags;
+
+ sp->cfg->reset_set(sp->cfg->reset_mac);
+ mdelay(10);
+ sp->cfg->reset_clear(sp->cfg->reset_mac);
+ mdelay(10);
+ sp->cfg->reset_set(sp->cfg->reset_phy);
+ mdelay(10);
+ sp->cfg->reset_clear(sp->cfg->reset_phy);
+ mdelay(10);
+
+ sp->dma_regs->bus_mode = (DMA_BUS_MODE_SWR);
+ mdelay(10);
+ sp->dma_regs->bus_mode =
+ ((32 << DMA_BUS_MODE_PBL_SHIFT) | DMA_BUS_MODE_BLE);
+
+ /* enable interrupts */
+ sp->dma_regs->intr_ena = DMA_STATUS_AIS | DMA_STATUS_NIS |
+ DMA_STATUS_RI | DMA_STATUS_TI |
+ DMA_STATUS_FBE;
+ sp->dma_regs->xmt_base = virt_to_phys(sp->tx_ring);
+ sp->dma_regs->rcv_base = virt_to_phys(sp->rx_ring);
+ sp->dma_regs->control =
+ (DMA_CONTROL_SR | DMA_CONTROL_ST | DMA_CONTROL_SF);
+
+ sp->eth_regs->flow_control = (FLOW_CONTROL_FCE);
+ sp->eth_regs->vlan_tag = (0x8100);
+
+ /* Enable Ethernet Interface */
+ flags = (MAC_CONTROL_TE | /* transmit enable */
+ MAC_CONTROL_PM | /* pass mcast */
+ MAC_CONTROL_F | /* full duplex */
+ MAC_CONTROL_HBD); /* heart beat disabled */
+
+ if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
+ flags |= MAC_CONTROL_PR;
+ }
+ sp->eth_regs->mac_control = flags;
+
+ /* Set all Ethernet station address registers to their initial values */
+ ethsah = (((u_int) (dev->dev_addr[5]) << 8) & (u_int) 0x0000FF00) |
+ (((u_int) (dev->dev_addr[4]) << 0) & (u_int) 0x000000FF);
+
+ ethsal = (((u_int) (dev->dev_addr[3]) << 24) & (u_int) 0xFF000000) |
+ (((u_int) (dev->dev_addr[2]) << 16) & (u_int) 0x00FF0000) |
+ (((u_int) (dev->dev_addr[1]) << 8) & (u_int) 0x0000FF00) |
+ (((u_int) (dev->dev_addr[0]) << 0) & (u_int) 0x000000FF);
+
+ sp->eth_regs->mac_addr[0] = ethsah;
+ sp->eth_regs->mac_addr[1] = ethsal;
+
+ mdelay(10);
+
+ return 0;
+}
+
+static int ar231x_init(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ int ecode = 0;
+
+ /* Allocate descriptors */
+ if (ar231x_allocate_descriptors(dev)) {
+ printk("%s: %s: ar231x_allocate_descriptors failed\n",
+ dev->name, __func__);
+ ecode = -EAGAIN;
+ goto init_error;
+ }
+
+ /* Get the memory for the skb rings */
+ if (sp->rx_skb == NULL) {
+ sp->rx_skb =
+ kmalloc(sizeof(struct sk_buff *) * AR2313_DESCR_ENTRIES,
+ GFP_KERNEL);
+ if (!(sp->rx_skb)) {
+ printk("%s: %s: rx_skb kmalloc failed\n",
+ dev->name, __func__);
+ ecode = -EAGAIN;
+ goto init_error;
+ }
+ }
+ memset(sp->rx_skb, 0, sizeof(struct sk_buff *) * AR2313_DESCR_ENTRIES);
+
+ if (sp->tx_skb == NULL) {
+ sp->tx_skb =
+ kmalloc(sizeof(struct sk_buff *) * AR2313_DESCR_ENTRIES,
+ GFP_KERNEL);
+ if (!(sp->tx_skb)) {
+ printk("%s: %s: tx_skb kmalloc failed\n",
+ dev->name, __func__);
+ ecode = -EAGAIN;
+ goto init_error;
+ }
+ }
+ memset(sp->tx_skb, 0, sizeof(struct sk_buff *) * AR2313_DESCR_ENTRIES);
+
+ /**
+ * Set tx_csm before we start receiving interrupts, otherwise
+ * the interrupt handler might think it is supposed to process
+ * tx ints before we are up and running, which may cause a null
+ * pointer access in the int handler.
+ */
+ sp->rx_skbprd = 0;
+ sp->cur_rx = 0;
+ sp->tx_prd = 0;
+ sp->tx_csm = 0;
+
+ /* Zero the stats before starting the interface */
+ memset(&dev->stats, 0, sizeof(dev->stats));
+
+ /**
+ * We load the ring here as there seem to be no way to tell the
+ * firmware to wipe the ring without re-initializing it.
+ */
+ ar231x_load_rx_ring(dev, RX_RING_SIZE);
+
+ /* Init hardware */
+ ar231x_reset_reg(dev);
+
+ /* Get the IRQ */
+ ecode = request_irq(dev->irq, &ar231x_interrupt, 0,
+ dev->name, dev);
+ if (ecode) {
+ printk(KERN_WARNING "%s: %s: Requested IRQ %d is busy\n",
+ dev->name, __func__, dev->irq);
+ goto init_error;
+ }
+
+ tasklet_enable(&sp->rx_tasklet);
+
+ return 0;
+
+init_error:
+ ar231x_init_cleanup(dev);
+ return ecode;
+}
+
+/**
+ * Load the rx ring.
+ *
+ * Loading rings is safe without holding the spin lock since this is
+ * done only before the device is enabled, thus no interrupts are
+ * generated and by the interrupt handler/tasklet handler.
+ */
+static void ar231x_load_rx_ring(struct net_device *dev, int nr_bufs)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ short i, idx;
+
+ idx = sp->rx_skbprd;
+
+ for (i = 0; i < nr_bufs; i++) {
+ struct sk_buff *skb;
+ ar231x_descr_t *rd;
+
+ if (sp->rx_skb[idx])
+ break;
+
+ skb = netdev_alloc_skb_ip_align(dev, AR2313_BUFSIZE);
+ if (!skb) {
+ printk("\n\n\n\n %s: No memory in system\n\n\n\n",
+ __func__);
+ break;
+ }
+
+ /* Make sure IP header starts on a fresh cache line */
+ skb->dev = dev;
+ sp->rx_skb[idx] = skb;
+
+ rd = (ar231x_descr_t *)&sp->rx_ring[idx];
+
+ /* initialize dma descriptor */
+ rd->devcs = ((AR2313_BUFSIZE << DMA_RX1_BSIZE_SHIFT) |
+ DMA_RX1_CHAINED);
+ rd->addr = virt_to_phys(skb->data);
+ rd->descr = virt_to_phys(&sp->rx_ring[DSC_NEXT(idx)]);
+ rd->status = DMA_RX_OWN;
+
+ idx = DSC_NEXT(idx);
+ }
+
+ if (i)
+ sp->rx_skbprd = idx;
+}
+
+#define AR2313_MAX_PKTS_PER_CALL 64
+
+static int ar231x_rx_int(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ struct sk_buff *skb, *skb_new;
+ ar231x_descr_t *rxdesc;
+ unsigned int status;
+ u32 idx;
+ int pkts = 0;
+ int rval;
+
+ idx = sp->cur_rx;
+
+ /* process at most the entire ring and then wait for another int */
+ while (1) {
+ rxdesc = &sp->rx_ring[idx];
+ status = rxdesc->status;
+
+ if (status & DMA_RX_OWN) {
+ /* SiByte owns descriptor or descr not yet filled in */
+ rval = 0;
+ break;
+ }
+
+ if (++pkts > AR2313_MAX_PKTS_PER_CALL) {
+ rval = 1;
+ break;
+ }
+
+ if ((status & DMA_RX_ERROR) && !(status & DMA_RX_LONG)) {
+ dev->stats.rx_errors++;
+ dev->stats.rx_dropped++;
+
+ /* add statistics counters */
+ if (status & DMA_RX_ERR_CRC)
+ dev->stats.rx_crc_errors++;
+ if (status & DMA_RX_ERR_COL)
+ dev->stats.rx_over_errors++;
+ if (status & DMA_RX_ERR_LENGTH)
+ dev->stats.rx_length_errors++;
+ if (status & DMA_RX_ERR_RUNT)
+ dev->stats.rx_over_errors++;
+ if (status & DMA_RX_ERR_DESC)
+ dev->stats.rx_over_errors++;
+
+ } else {
+ /* alloc new buffer. */
+ skb_new = netdev_alloc_skb_ip_align(dev,
+ AR2313_BUFSIZE);
+ if (skb_new != NULL) {
+ skb = sp->rx_skb[idx];
+ /* set skb */
+ skb_put(skb, ((status >> DMA_RX_LEN_SHIFT) &
+ 0x3fff) - CRC_LEN);
+
+ dev->stats.rx_bytes += skb->len;
+ skb->protocol = eth_type_trans(skb, dev);
+ /* pass the packet to upper layers */
+ netif_rx(skb);
+
+ skb_new->dev = dev;
+ /* reset descriptor's curr_addr */
+ rxdesc->addr = virt_to_phys(skb_new->data);
+
+ dev->stats.rx_packets++;
+ sp->rx_skb[idx] = skb_new;
+ } else {
+ dev->stats.rx_dropped++;
+ }
+ }
+
+ rxdesc->devcs = ((AR2313_BUFSIZE << DMA_RX1_BSIZE_SHIFT) |
+ DMA_RX1_CHAINED);
+ rxdesc->status = DMA_RX_OWN;
+
+ idx = DSC_NEXT(idx);
+ }
+
+ sp->cur_rx = idx;
+
+ return rval;
+}
+
+static void ar231x_tx_int(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ u32 idx;
+ struct sk_buff *skb;
+ ar231x_descr_t *txdesc;
+ unsigned int status = 0;
+
+ idx = sp->tx_csm;
+
+ while (idx != sp->tx_prd) {
+ txdesc = &sp->tx_ring[idx];
+ status = txdesc->status;
+
+ if (status & DMA_TX_OWN) {
+ /* ar231x dma still owns descr */
+ break;
+ }
+ /* done with this descriptor */
+ dma_unmap_single(&sp->pdev->dev, txdesc->addr,
+ txdesc->devcs & DMA_TX1_BSIZE_MASK,
+ DMA_TO_DEVICE);
+ txdesc->status = 0;
+
+ if (status & DMA_TX_ERROR) {
+ dev->stats.tx_errors++;
+ dev->stats.tx_dropped++;
+ if (status & DMA_TX_ERR_UNDER)
+ dev->stats.tx_fifo_errors++;
+ if (status & DMA_TX_ERR_HB)
+ dev->stats.tx_heartbeat_errors++;
+ if (status & (DMA_TX_ERR_LOSS | DMA_TX_ERR_LINK))
+ dev->stats.tx_carrier_errors++;
+ if (status & (DMA_TX_ERR_LATE | DMA_TX_ERR_COL |
+ DMA_TX_ERR_JABBER | DMA_TX_ERR_DEFER))
+ dev->stats.tx_aborted_errors++;
+ } else {
+ /* transmit OK */
+ dev->stats.tx_packets++;
+ }
+
+ skb = sp->tx_skb[idx];
+ sp->tx_skb[idx] = NULL;
+ idx = DSC_NEXT(idx);
+ dev->stats.tx_bytes += skb->len;
+ dev_kfree_skb_irq(skb);
+ }
+
+ sp->tx_csm = idx;
+}
+
+static void rx_tasklet_func(unsigned long data)
+{
+ struct net_device *dev = (struct net_device *)data;
+ struct ar231x_private *sp = netdev_priv(dev);
+
+ if (sp->unloading)
+ return;
+
+ if (ar231x_rx_int(dev)) {
+ tasklet_hi_schedule(&sp->rx_tasklet);
+ } else {
+ unsigned long flags;
+
+ spin_lock_irqsave(&sp->lock, flags);
+ sp->dma_regs->intr_ena |= DMA_STATUS_RI;
+ spin_unlock_irqrestore(&sp->lock, flags);
+ }
+}
+
+static void rx_schedule(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+
+ sp->dma_regs->intr_ena &= ~DMA_STATUS_RI;
+
+ tasklet_hi_schedule(&sp->rx_tasklet);
+}
+
+static irqreturn_t ar231x_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = (struct net_device *)dev_id;
+ struct ar231x_private *sp = netdev_priv(dev);
+ unsigned int status, enabled;
+
+ /* clear interrupt */
+ /* Don't clear RI bit if currently disabled */
+ status = sp->dma_regs->status;
+ enabled = sp->dma_regs->intr_ena;
+ sp->dma_regs->status = status & enabled;
+
+ if (status & DMA_STATUS_NIS) {
+ /* normal status */
+ /**
+ * Don't schedule rx processing if interrupt
+ * is already disabled.
+ */
+ if (status & enabled & DMA_STATUS_RI) {
+ /* receive interrupt */
+ rx_schedule(dev);
+ }
+ if (status & DMA_STATUS_TI) {
+ /* transmit interrupt */
+ ar231x_tx_int(dev);
+ }
+ }
+
+ /* abnormal status */
+ if (status & (DMA_STATUS_FBE | DMA_STATUS_TPS))
+ ar231x_restart(dev);
+
+ return IRQ_HANDLED;
+}
+
+static int ar231x_open(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ unsigned int ethsal, ethsah;
+
+ /* reset the hardware, in case the MAC address changed */
+ ethsah = (((u_int) (dev->dev_addr[5]) << 8) & (u_int) 0x0000FF00) |
+ (((u_int) (dev->dev_addr[4]) << 0) & (u_int) 0x000000FF);
+
+ ethsal = (((u_int) (dev->dev_addr[3]) << 24) & (u_int) 0xFF000000) |
+ (((u_int) (dev->dev_addr[2]) << 16) & (u_int) 0x00FF0000) |
+ (((u_int) (dev->dev_addr[1]) << 8) & (u_int) 0x0000FF00) |
+ (((u_int) (dev->dev_addr[0]) << 0) & (u_int) 0x000000FF);
+
+ sp->eth_regs->mac_addr[0] = ethsah;
+ sp->eth_regs->mac_addr[1] = ethsal;
+
+ mdelay(10);
+
+ dev->mtu = 1500;
+ netif_start_queue(dev);
+
+ sp->eth_regs->mac_control |= MAC_CONTROL_RE;
+
+ phy_start(sp->phy_dev);
+
+ return 0;
+}
+
+static void ar231x_tx_timeout(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&sp->lock, flags);
+ ar231x_restart(dev);
+ spin_unlock_irqrestore(&sp->lock, flags);
+}
+
+static void ar231x_halt(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ int j;
+
+ tasklet_disable(&sp->rx_tasklet);
+
+ /* kill the MAC */
+ sp->eth_regs->mac_control &= ~(MAC_CONTROL_RE | /* disable Receives */
+ MAC_CONTROL_TE); /* disable Transmits */
+ /* stop dma */
+ sp->dma_regs->control = 0;
+ sp->dma_regs->bus_mode = DMA_BUS_MODE_SWR;
+
+ /* place phy and MAC in reset */
+ sp->cfg->reset_set(sp->cfg->reset_mac);
+ sp->cfg->reset_set(sp->cfg->reset_phy);
+
+ /* free buffers on tx ring */
+ for (j = 0; j < AR2313_DESCR_ENTRIES; j++) {
+ struct sk_buff *skb;
+ ar231x_descr_t *txdesc;
+
+ txdesc = &sp->tx_ring[j];
+ txdesc->descr = 0;
+
+ skb = sp->tx_skb[j];
+ if (skb) {
+ dev_kfree_skb(skb);
+ sp->tx_skb[j] = NULL;
+ }
+ }
+}
+
+/**
+ * close should do nothing. Here's why. It's called when
+ * 'ifconfig bond0 down' is run. If it calls free_irq then
+ * the irq is gone forever ! When bond0 is made 'up' again,
+ * the ar231x_open () does not call request_irq (). Worse,
+ * the call to ar231x_halt() generates a WDOG reset due to
+ * the write to reset register and the box reboots.
+ * Commenting this out is good since it allows the
+ * system to resume when bond0 is made up again.
+ */
+static int ar231x_close(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+#if 0
+ /* Disable interrupts */
+ disable_irq(dev->irq);
+
+ /**
+ * Without (or before) releasing irq and stopping hardware, this
+ * is an absolute non-sense, by the way. It will be reset instantly
+ * by the first irq.
+ */
+ netif_stop_queue(dev);
+
+ /* stop the MAC and DMA engines */
+ ar231x_halt(dev);
+
+ /* release the interrupt */
+ free_irq(dev->irq, dev);
+
+#endif
+
+ phy_stop(sp->phy_dev);
+
+ return 0;
+}
+
+static int ar231x_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ ar231x_descr_t *td;
+ u32 idx;
+
+ idx = sp->tx_prd;
+ td = &sp->tx_ring[idx];
+
+ if (td->status & DMA_TX_OWN) {
+ /* free skbuf and lie to the caller that we sent it out */
+ dev->stats.tx_dropped++;
+ dev_kfree_skb(skb);
+
+ /* restart transmitter in case locked */
+ sp->dma_regs->xmt_poll = 0;
+ return 0;
+ }
+
+ /* Setup the transmit descriptor. */
+ td->devcs = ((skb->len << DMA_TX1_BSIZE_SHIFT) |
+ (DMA_TX1_LS | DMA_TX1_IC | DMA_TX1_CHAINED));
+ td->addr = dma_map_single(&sp->pdev->dev, skb->data, skb->len, DMA_TO_DEVICE);
+ td->status = DMA_TX_OWN;
+
+ /* kick transmitter last */
+ sp->dma_regs->xmt_poll = 0;
+
+ sp->tx_skb[idx] = skb;
+ idx = DSC_NEXT(idx);
+ sp->tx_prd = idx;
+
+ return 0;
+}
+
+static int ar231x_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+
+ switch (cmd) {
+ case SIOCGMIIPHY:
+ case SIOCGMIIREG:
+ case SIOCSMIIREG:
+ return phy_mii_ioctl(sp->phy_dev, ifr, cmd);
+
+ default:
+ break;
+ }
+
+ return -EOPNOTSUPP;
+}
+
+static void ar231x_adjust_link(struct net_device *dev)
+{
+ struct ar231x_private *sp = netdev_priv(dev);
+ struct phy_device *phydev = sp->phy_dev;
+ u32 mc;
+
+ if (!phydev->link) {
+ if (sp->link) {
+ pr_info("%s: link down\n", dev->name);
+ sp->link = 0;
+ }
+ return;
+ }
+ sp->link = 1;
+
+ pr_info("%s: link up (%uMbps/%s duplex)\n", dev->name,
+ phydev->speed, phydev->duplex ? "full" : "half");
+
+ mc = sp->eth_regs->mac_control;
+ if (phydev->duplex)
+ mc = (mc | MAC_CONTROL_F) & ~MAC_CONTROL_DRO;
+ else
+ mc = (mc | MAC_CONTROL_DRO) & ~MAC_CONTROL_F;
+ sp->eth_regs->mac_control = mc;
+ sp->duplex = phydev->duplex;
+}
+
+#define MII_ADDR(phy, reg) \
+ ((reg << MII_ADDR_REG_SHIFT) | (phy << MII_ADDR_PHY_SHIFT))
+
+static int
+ar231x_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
+{
+ struct net_device *const dev = bus->priv;
+ struct ar231x_private *sp = netdev_priv(dev);
+ volatile MII *ethernet = sp->phy_regs;
+
+ ethernet->mii_addr = MII_ADDR(phy_addr, regnum);
+ while (ethernet->mii_addr & MII_ADDR_BUSY)
+ ;
+ return ethernet->mii_data >> MII_DATA_SHIFT;
+}
+
+static int
+ar231x_mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum, u16 value)
+{
+ struct net_device *const dev = bus->priv;
+ struct ar231x_private *sp = netdev_priv(dev);
+ volatile MII *ethernet = sp->phy_regs;
+
+ while (ethernet->mii_addr & MII_ADDR_BUSY)
+ ;
+ ethernet->mii_data = value << MII_DATA_SHIFT;
+ ethernet->mii_addr = MII_ADDR(phy_addr, regnum) | MII_ADDR_WRITE;
+
+ return 0;
+}
+
+static int ar231x_mdiobus_reset(struct mii_bus *bus)
+{
+ struct net_device *const dev = bus->priv;
+
+ ar231x_reset_reg(dev);
+
+ return 0;
+}
+
+static int ar231x_mdiobus_probe(struct net_device *dev)
+{
+ __ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
+ struct ar231x_private *const sp = netdev_priv(dev);
+ struct phy_device *phydev = NULL;
+
+ /* find the first (lowest address) PHY on the current MAC's MII bus */
+ phydev = phy_find_first(sp->mii_bus);
+ if (!phydev) {
+ printk(KERN_ERR "ar231x: %s: no PHY found\n", dev->name);
+ return -1;
+ }
+
+ /* now we are supposed to have a proper phydev, to attach to... */
+ BUG_ON(phydev->attached_dev);
+
+ phydev = phy_connect(dev, phydev_name(phydev), &ar231x_adjust_link,
+ PHY_INTERFACE_MODE_MII);
+ if (IS_ERR(phydev)) {
+ printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
+ return PTR_ERR(phydev);
+ }
+
+ /* mask with MAC supported features */
+ linkmode_set_bit_array(phy_10_100_features_array,
+ ARRAY_SIZE(phy_10_100_features_array),
+ mask);
+ linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, mask);
+ linkmode_set_bit(ETHTOOL_LINK_MODE_MII_BIT, mask);
+ linkmode_set_bit(ETHTOOL_LINK_MODE_TP_BIT, mask);
+
+ linkmode_and(phydev->supported, phydev->supported, mask);
+ linkmode_copy(phydev->advertising, phydev->supported);
+
+ sp->phy_dev = phydev;
+
+ printk(KERN_INFO "%s: attached PHY driver [%s] (mii_bus:phy_addr=%s)\n",
+ dev->name, phydev->drv->name, phydev_name(phydev));
+
+ return 0;
+}
+
--- /dev/null
+++ b/drivers/net/ethernet/atheros/ar231x/ar231x.h
@@ -0,0 +1,282 @@
+/*
+ * ar231x.h: Linux driver for the Atheros AR231x Ethernet device.
+ *
+ * Copyright (C) 2004 by Sameer Dekate <sdekate@arubanetworks.com>
+ * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2006-2009 Felix Fietkau <nbd@nbd.name>
+ *
+ * Thanks to Atheros for providing hardware and documentation
+ * enabling me to write this driver.
+ *
+ * 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.
+ */
+
+#ifndef _AR2313_H_
+#define _AR2313_H_
+
+#include <linux/interrupt.h>
+#include <generated/autoconf.h>
+#include <linux/bitops.h>
+#include <ath25_platform.h>
+
+/* probe link timer - 5 secs */
+#define LINK_TIMER (5*HZ)
+
+#define IS_DMA_TX_INT(X) (((X) & (DMA_STATUS_TI)) != 0)
+#define IS_DMA_RX_INT(X) (((X) & (DMA_STATUS_RI)) != 0)
+#define IS_DRIVER_OWNED(X) (((X) & (DMA_TX_OWN)) == 0)
+
+#define AR2313_TX_TIMEOUT (HZ/4)
+
+/* Rings */
+#define DSC_RING_ENTRIES_SIZE (AR2313_DESCR_ENTRIES * sizeof(struct desc))
+#define DSC_NEXT(idx) ((idx + 1) & (AR2313_DESCR_ENTRIES - 1))
+
+#define AR2313_MBGET 2
+#define AR2313_MBSET 3
+#define AR2313_PCI_RECONFIG 4
+#define AR2313_PCI_DUMP 5
+#define AR2313_TEST_PANIC 6
+#define AR2313_TEST_NULLPTR 7
+#define AR2313_READ_DATA 8
+#define AR2313_WRITE_DATA 9
+#define AR2313_GET_VERSION 10
+#define AR2313_TEST_HANG 11
+#define AR2313_SYNC 12
+
+#define DMA_RX_ERR_CRC BIT(1)
+#define DMA_RX_ERR_DRIB BIT(2)
+#define DMA_RX_ERR_MII BIT(3)
+#define DMA_RX_EV2 BIT(5)
+#define DMA_RX_ERR_COL BIT(6)
+#define DMA_RX_LONG BIT(7)
+#define DMA_RX_LS BIT(8) /* last descriptor */
+#define DMA_RX_FS BIT(9) /* first descriptor */
+#define DMA_RX_MF BIT(10) /* multicast frame */
+#define DMA_RX_ERR_RUNT BIT(11) /* runt frame */
+#define DMA_RX_ERR_LENGTH BIT(12) /* length error */
+#define DMA_RX_ERR_DESC BIT(14) /* descriptor error */
+#define DMA_RX_ERROR BIT(15) /* error summary */
+#define DMA_RX_LEN_MASK 0x3fff0000
+#define DMA_RX_LEN_SHIFT 16
+#define DMA_RX_FILT BIT(30)
+#define DMA_RX_OWN BIT(31) /* desc owned by DMA controller */
+
+#define DMA_RX1_BSIZE_MASK 0x000007ff
+#define DMA_RX1_BSIZE_SHIFT 0
+#define DMA_RX1_CHAINED BIT(24)
+#define DMA_RX1_RER BIT(25)
+
+#define DMA_TX_ERR_UNDER BIT(1) /* underflow error */
+#define DMA_TX_ERR_DEFER BIT(2) /* excessive deferral */
+#define DMA_TX_COL_MASK 0x78
+#define DMA_TX_COL_SHIFT 3
+#define DMA_TX_ERR_HB BIT(7) /* hearbeat failure */
+#define DMA_TX_ERR_COL BIT(8) /* excessive collisions */
+#define DMA_TX_ERR_LATE BIT(9) /* late collision */
+#define DMA_TX_ERR_LINK BIT(10) /* no carrier */
+#define DMA_TX_ERR_LOSS BIT(11) /* loss of carrier */
+#define DMA_TX_ERR_JABBER BIT(14) /* transmit jabber timeout */
+#define DMA_TX_ERROR BIT(15) /* frame aborted */
+#define DMA_TX_OWN BIT(31) /* descr owned by DMA controller */
+
+#define DMA_TX1_BSIZE_MASK 0x000007ff
+#define DMA_TX1_BSIZE_SHIFT 0
+#define DMA_TX1_CHAINED BIT(24) /* chained descriptors */
+#define DMA_TX1_TER BIT(25) /* transmit end of ring */
+#define DMA_TX1_FS BIT(29) /* first segment */
+#define DMA_TX1_LS BIT(30) /* last segment */
+#define DMA_TX1_IC BIT(31) /* interrupt on completion */
+
+#define RCVPKT_LENGTH(X) (X >> 16) /* Received pkt Length */
+
+#define MAC_CONTROL_RE BIT(2) /* receive enable */
+#define MAC_CONTROL_TE BIT(3) /* transmit enable */
+#define MAC_CONTROL_DC BIT(5) /* Deferral check */
+#define MAC_CONTROL_ASTP BIT(8) /* Auto pad strip */
+#define MAC_CONTROL_DRTY BIT(10) /* Disable retry */
+#define MAC_CONTROL_DBF BIT(11) /* Disable bcast frames */
+#define MAC_CONTROL_LCC BIT(12) /* late collision ctrl */
+#define MAC_CONTROL_HP BIT(13) /* Hash Perfect filtering */
+#define MAC_CONTROL_HASH BIT(14) /* Unicast hash filtering */
+#define MAC_CONTROL_HO BIT(15) /* Hash only filtering */
+#define MAC_CONTROL_PB BIT(16) /* Pass Bad frames */
+#define MAC_CONTROL_IF BIT(17) /* Inverse filtering */
+#define MAC_CONTROL_PR BIT(18) /* promis mode (valid frames only) */
+#define MAC_CONTROL_PM BIT(19) /* pass multicast */
+#define MAC_CONTROL_F BIT(20) /* full-duplex */
+#define MAC_CONTROL_DRO BIT(23) /* Disable Receive Own */
+#define MAC_CONTROL_HBD BIT(28) /* heart-beat disabled (MUST BE SET) */
+#define MAC_CONTROL_BLE BIT(30) /* big endian mode */
+#define MAC_CONTROL_RA BIT(31) /* rcv all (valid and invalid frames) */
+
+#define MII_ADDR_BUSY BIT(0)
+#define MII_ADDR_WRITE BIT(1)
+#define MII_ADDR_REG_SHIFT 6
+#define MII_ADDR_PHY_SHIFT 11
+#define MII_DATA_SHIFT 0
+
+#define FLOW_CONTROL_FCE BIT(1)
+
+#define DMA_BUS_MODE_SWR BIT(0) /* software reset */
+#define DMA_BUS_MODE_BLE BIT(7) /* big endian mode */
+#define DMA_BUS_MODE_PBL_SHIFT 8 /* programmable burst length 32 */
+#define DMA_BUS_MODE_DBO BIT(20) /* big-endian descriptors */
+
+#define DMA_STATUS_TI BIT(0) /* transmit interrupt */
+#define DMA_STATUS_TPS BIT(1) /* transmit process stopped */
+#define DMA_STATUS_TU BIT(2) /* transmit buffer unavailable */
+#define DMA_STATUS_TJT BIT(3) /* transmit buffer timeout */
+#define DMA_STATUS_UNF BIT(5) /* transmit underflow */
+#define DMA_STATUS_RI BIT(6) /* receive interrupt */
+#define DMA_STATUS_RU BIT(7) /* receive buffer unavailable */
+#define DMA_STATUS_RPS BIT(8) /* receive process stopped */
+#define DMA_STATUS_ETI BIT(10) /* early transmit interrupt */
+#define DMA_STATUS_FBE BIT(13) /* fatal bus interrupt */
+#define DMA_STATUS_ERI BIT(14) /* early receive interrupt */
+#define DMA_STATUS_AIS BIT(15) /* abnormal interrupt summary */
+#define DMA_STATUS_NIS BIT(16) /* normal interrupt summary */
+#define DMA_STATUS_RS_SHIFT 17 /* receive process state */
+#define DMA_STATUS_TS_SHIFT 20 /* transmit process state */
+#define DMA_STATUS_EB_SHIFT 23 /* error bits */
+
+#define DMA_CONTROL_SR BIT(1) /* start receive */
+#define DMA_CONTROL_ST BIT(13) /* start transmit */
+#define DMA_CONTROL_SF BIT(21) /* store and forward */
+
+typedef struct {
+ volatile unsigned int status; /* OWN, Device control and status. */
+ volatile unsigned int devcs; /* pkt Control bits + Length */
+ volatile unsigned int addr; /* Current Address. */
+ volatile unsigned int descr; /* Next descriptor in chain. */
+} ar231x_descr_t;
+
+/**
+ * New Combo structure for Both Eth0 AND eth1
+ *
+ * Don't directly access MII related regs since phy chip could be actually
+ * connected to another ethernet block.
+ */
+typedef struct {
+ volatile unsigned int mac_control; /* 0x00 */
+ volatile unsigned int mac_addr[2]; /* 0x04 - 0x08 */
+ volatile unsigned int mcast_table[2]; /* 0x0c - 0x10 */
+ volatile unsigned int __mii_addr; /* 0x14 */
+ volatile unsigned int __mii_data; /* 0x18 */
+ volatile unsigned int flow_control; /* 0x1c */
+ volatile unsigned int vlan_tag; /* 0x20 */
+ volatile unsigned int pad[7]; /* 0x24 - 0x3c */
+ volatile unsigned int ucast_table[8]; /* 0x40-0x5c */
+} ETHERNET_STRUCT;
+
+typedef struct {
+ volatile unsigned int mii_addr;
+ volatile unsigned int mii_data;
+} MII;
+
+/********************************************************************
+ * Interrupt controller
+ ********************************************************************/
+
+typedef struct {
+ volatile unsigned int wdog_control; /* 0x08 */
+ volatile unsigned int wdog_timer; /* 0x0c */
+ volatile unsigned int misc_status; /* 0x10 */
+ volatile unsigned int misc_mask; /* 0x14 */
+ volatile unsigned int global_status; /* 0x18 */
+ volatile unsigned int reserved; /* 0x1c */
+ volatile unsigned int reset_control; /* 0x20 */
+} INTERRUPT;
+
+/********************************************************************
+ * DMA controller
+ ********************************************************************/
+typedef struct {
+ volatile unsigned int bus_mode; /* 0x00 (CSR0) */
+ volatile unsigned int xmt_poll; /* 0x04 (CSR1) */
+ volatile unsigned int rcv_poll; /* 0x08 (CSR2) */
+ volatile unsigned int rcv_base; /* 0x0c (CSR3) */
+ volatile unsigned int xmt_base; /* 0x10 (CSR4) */
+ volatile unsigned int status; /* 0x14 (CSR5) */
+ volatile unsigned int control; /* 0x18 (CSR6) */
+ volatile unsigned int intr_ena; /* 0x1c (CSR7) */
+ volatile unsigned int rcv_missed; /* 0x20 (CSR8) */
+ volatile unsigned int reserved[11]; /* 0x24-0x4c (CSR9-19) */
+ volatile unsigned int cur_tx_buf_addr; /* 0x50 (CSR20) */
+ volatile unsigned int cur_rx_buf_addr; /* 0x50 (CSR21) */
+} DMA;
+
+/**
+ * Struct private for the Sibyte.
+ *
+ * Elements are grouped so variables used by the tx handling goes
+ * together, and will go into the same cache lines etc. in order to
+ * avoid cache line contention between the rx and tx handling on SMP.
+ *
+ * Frequently accessed variables are put at the beginning of the
+ * struct to help the compiler generate better/shorter code.
+ */
+struct ar231x_private {
+ struct net_device *dev;
+ struct platform_device *pdev;
+ int version;
+ u32 mb[2];
+
+ volatile MII *phy_regs;
+ volatile ETHERNET_STRUCT *eth_regs;
+ volatile DMA *dma_regs;
+ struct ar231x_eth *cfg;
+
+ spinlock_t lock; /* Serialise access to device */
+
+ /* RX and TX descriptors, must be adjacent */
+ ar231x_descr_t *rx_ring;
+ ar231x_descr_t *tx_ring;
+
+ struct sk_buff **rx_skb;
+ struct sk_buff **tx_skb;
+
+ /* RX elements */
+ u32 rx_skbprd;
+ u32 cur_rx;
+
+ /* TX elements */
+ u32 tx_prd;
+ u32 tx_csm;
+
+ /* Misc elements */
+ char name[48];
+ struct {
+ u32 address;
+ u32 length;
+ char *mapping;
+ } desc;
+
+ unsigned short link; /* 0 - link down, 1 - link up */
+ unsigned short duplex; /* 0 - half, 1 - full */
+
+ struct tasklet_struct rx_tasklet;
+ int unloading;
+
+ struct phy_device *phy_dev;
+ struct mii_bus *mii_bus;
+};
+
+/* Prototypes */
+static int ar231x_init(struct net_device *dev);
+#ifdef TX_TIMEOUT
+static void ar231x_tx_timeout(struct net_device *dev);
+#endif
+static int ar231x_restart(struct net_device *dev);
+static void ar231x_load_rx_ring(struct net_device *dev, int bufs);
+static irqreturn_t ar231x_interrupt(int irq, void *dev_id);
+static int ar231x_open(struct net_device *dev);
+static int ar231x_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static int ar231x_close(struct net_device *dev);
+static int ar231x_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
+static void ar231x_init_cleanup(struct net_device *dev);
+
+#endif /* _AR2313_H_ */
--- a/arch/mips/ath25/ar2315_regs.h
+++ b/arch/mips/ath25/ar2315_regs.h
@@ -57,6 +57,9 @@
#define AR2315_PCI_EXT_BASE 0x80000000 /* PCI external */
#define AR2315_PCI_EXT_SIZE 0x40000000
+/* MII registers offset inside Ethernet MMR region */
+#define AR2315_ENET0_MII_BASE (AR2315_ENET0_BASE + 0x14)
+
/*
* Configuration registers
*/
--- a/arch/mips/ath25/ar5312_regs.h
+++ b/arch/mips/ath25/ar5312_regs.h
@@ -64,6 +64,10 @@
#define AR5312_AR5312_REV7 0x0057 /* AR5312 WMAC (AP30-040) */
#define AR5312_AR2313_REV8 0x0058 /* AR2313 WMAC (AP43-030) */
+/* MII registers offset inside Ethernet MMR region */
+#define AR5312_ENET0_MII_BASE (AR5312_ENET0_BASE + 0x14)
+#define AR5312_ENET1_MII_BASE (AR5312_ENET1_BASE + 0x14)
+
/* Reset/Timer Block Address Map */
#define AR5312_TIMER 0x0000 /* countdown timer */
#define AR5312_RELOAD 0x0004 /* timer reload value */
--- a/arch/mips/ath25/ar2315.c
+++ b/arch/mips/ath25/ar2315.c
@@ -136,6 +136,8 @@ static void ar2315_irq_dispatch(void)
if (pending & CAUSEF_IP3)
do_IRQ(AR2315_IRQ_WLAN0);
+ else if (pending & CAUSEF_IP4)
+ do_IRQ(AR2315_IRQ_ENET0);
#ifdef CONFIG_PCI_AR2315
else if (pending & CAUSEF_IP5)
do_IRQ(AR2315_IRQ_LCBUS_PCI);
@@ -169,6 +171,29 @@ void __init ar2315_arch_init_irq(void)
ar2315_misc_irq_domain = domain;
}
+static void ar2315_device_reset_set(u32 mask)
+{
+ u32 val;
+
+ val = ar2315_rst_reg_read(AR2315_RESET);
+ ar2315_rst_reg_write(AR2315_RESET, val | mask);
+}
+
+static void ar2315_device_reset_clear(u32 mask)
+{
+ u32 val;
+
+ val = ar2315_rst_reg_read(AR2315_RESET);
+ ar2315_rst_reg_write(AR2315_RESET, val & ~mask);
+}
+
+static struct ar231x_eth ar2315_eth_data = {
+ .reset_set = ar2315_device_reset_set,
+ .reset_clear = ar2315_device_reset_clear,
+ .reset_mac = AR2315_RESET_ENET0,
+ .reset_phy = AR2315_RESET_EPHY0,
+};
+
static struct resource ar2315_gpio_res[] = {
{
.name = "ar2315-gpio",
@@ -205,6 +230,11 @@ void __init ar2315_init_devices(void)
ar2315_gpio_res[1].end = ar2315_gpio_res[1].start;
platform_device_register(&ar2315_gpio);
+ ar2315_eth_data.macaddr = ath25_board.config->enet0_mac;
+ ath25_add_ethernet(0, AR2315_ENET0_BASE, "eth0_mii",
+ AR2315_ENET0_MII_BASE, AR2315_IRQ_ENET0,
+ &ar2315_eth_data);
+
ath25_add_wmac(0, AR2315_WLAN0_BASE, AR2315_IRQ_WLAN0);
}
--- a/arch/mips/ath25/ar5312.c
+++ b/arch/mips/ath25/ar5312.c
@@ -132,6 +132,10 @@ static void ar5312_irq_dispatch(void)
if (pending & CAUSEF_IP2)
do_IRQ(AR5312_IRQ_WLAN0);
+ else if (pending & CAUSEF_IP3)
+ do_IRQ(AR5312_IRQ_ENET0);
+ else if (pending & CAUSEF_IP4)
+ do_IRQ(AR5312_IRQ_ENET1);
else if (pending & CAUSEF_IP5)
do_IRQ(AR5312_IRQ_WLAN1);
else if (pending & CAUSEF_IP6)
@@ -163,6 +167,36 @@ void __init ar5312_arch_init_irq(void)
ar5312_misc_irq_domain = domain;
}
+static void ar5312_device_reset_set(u32 mask)
+{
+ u32 val;
+
+ val = ar5312_rst_reg_read(AR5312_RESET);
+ ar5312_rst_reg_write(AR5312_RESET, val | mask);
+}
+
+static void ar5312_device_reset_clear(u32 mask)
+{
+ u32 val;
+
+ val = ar5312_rst_reg_read(AR5312_RESET);
+ ar5312_rst_reg_write(AR5312_RESET, val & ~mask);
+}
+
+static struct ar231x_eth ar5312_eth0_data = {
+ .reset_set = ar5312_device_reset_set,
+ .reset_clear = ar5312_device_reset_clear,
+ .reset_mac = AR5312_RESET_ENET0,
+ .reset_phy = AR5312_RESET_EPHY0,
+};
+
+static struct ar231x_eth ar5312_eth1_data = {
+ .reset_set = ar5312_device_reset_set,
+ .reset_clear = ar5312_device_reset_clear,
+ .reset_mac = AR5312_RESET_ENET1,
+ .reset_phy = AR5312_RESET_EPHY1,
+};
+
static struct physmap_flash_data ar5312_flash_data = {
.width = 2,
};
@@ -243,6 +277,7 @@ static void __init ar5312_flash_init(voi
void __init ar5312_init_devices(void)
{
struct ath25_boarddata *config;
+ u8 *c;
ar5312_flash_init();
@@ -266,8 +301,30 @@ void __init ar5312_init_devices(void)
platform_device_register(&ar5312_gpio);
+ /* Fix up MAC addresses if necessary */
+ if (is_broadcast_ether_addr(config->enet0_mac))
+ ether_addr_copy(config->enet0_mac, config->enet1_mac);
+
+ /* If ENET0 and ENET1 have the same mac address,
+ * increment the one from ENET1 */
+ if (ether_addr_equal(config->enet0_mac, config->enet1_mac)) {
+ c = config->enet1_mac + 5;
+ while ((c >= config->enet1_mac) && !(++(*c)))
+ c--;
+ }
+
switch (ath25_soc) {
case ATH25_SOC_AR5312:
+ ar5312_eth0_data.macaddr = config->enet0_mac;
+ ath25_add_ethernet(0, AR5312_ENET0_BASE, "eth0_mii",
+ AR5312_ENET0_MII_BASE, AR5312_IRQ_ENET0,
+ &ar5312_eth0_data);
+
+ ar5312_eth1_data.macaddr = config->enet1_mac;
+ ath25_add_ethernet(1, AR5312_ENET1_BASE, "eth1_mii",
+ AR5312_ENET1_MII_BASE, AR5312_IRQ_ENET1,
+ &ar5312_eth1_data);
+
if (!ath25_board.radio)
return;
@@ -276,8 +333,18 @@ void __init ar5312_init_devices(void)
ath25_add_wmac(0, AR5312_WLAN0_BASE, AR5312_IRQ_WLAN0);
break;
+ /*
+ * AR2312/3 ethernet uses the PHY of ENET0, but the MAC
+ * of ENET1. Atheros calls it 'twisted' for a reason :)
+ */
case ATH25_SOC_AR2312:
case ATH25_SOC_AR2313:
+ ar5312_eth1_data.reset_phy = ar5312_eth0_data.reset_phy;
+ ar5312_eth1_data.macaddr = config->enet0_mac;
+ ath25_add_ethernet(1, AR5312_ENET1_BASE, "eth0_mii",
+ AR5312_ENET0_MII_BASE, AR5312_IRQ_ENET1,
+ &ar5312_eth1_data);
+
if (!ath25_board.radio)
return;
break;
--- a/arch/mips/ath25/devices.h
+++ b/arch/mips/ath25/devices.h
@@ -33,6 +33,8 @@ extern struct ar231x_board_config ath25_
extern void (*ath25_irq_dispatch)(void);
int ath25_find_config(phys_addr_t offset, unsigned long size);
+int ath25_add_ethernet(int nr, u32 base, const char *mii_name, u32 mii_base,
+ int irq, void *pdata);
void ath25_serial_setup(u32 mapbase, int irq, unsigned int uartclk);
int ath25_add_wmac(int nr, u32 base, int irq);
--- a/arch/mips/ath25/devices.c
+++ b/arch/mips/ath25/devices.c
@@ -13,6 +13,51 @@
struct ar231x_board_config ath25_board;
enum ath25_soc_type ath25_soc = ATH25_SOC_UNKNOWN;
+static struct resource ath25_eth0_res[] = {
+ {
+ .name = "eth0_membase",
+ .flags = IORESOURCE_MEM,
+ },
+ {
+ .name = "eth0_mii",
+ .flags = IORESOURCE_MEM,
+ },
+ {
+ .name = "eth0_irq",
+ .flags = IORESOURCE_IRQ,
+ }
+};
+
+static struct resource ath25_eth1_res[] = {
+ {
+ .name = "eth1_membase",
+ .flags = IORESOURCE_MEM,
+ },
+ {
+ .name = "eth1_mii",
+ .flags = IORESOURCE_MEM,
+ },
+ {
+ .name = "eth1_irq",
+ .flags = IORESOURCE_IRQ,
+ }
+};
+
+static struct platform_device ath25_eth[] = {
+ {
+ .id = 0,
+ .name = "ar231x-eth",
+ .resource = ath25_eth0_res,
+ .num_resources = ARRAY_SIZE(ath25_eth0_res)
+ },
+ {
+ .id = 1,
+ .name = "ar231x-eth",
+ .resource = ath25_eth1_res,
+ .num_resources = ARRAY_SIZE(ath25_eth1_res)
+ }
+};
+
static struct resource ath25_wmac0_res[] = {
{
.name = "wmac0_membase",
@@ -71,6 +116,25 @@ const char *get_system_type(void)
return soc_type_strings[ath25_soc];
}
+int __init ath25_add_ethernet(int nr, u32 base, const char *mii_name,
+ u32 mii_base, int irq, void *pdata)
+{
+ struct resource *res;
+
+ ath25_eth[nr].dev.platform_data = pdata;
+ res = &ath25_eth[nr].resource[0];
+ res->start = base;
+ res->end = base + 0x2000 - 1;
+ res++;
+ res->name = mii_name;
+ res->start = mii_base;
+ res->end = mii_base + 8 - 1;
+ res++;
+ res->start = irq;
+ res->end = irq;
+ return platform_device_register(&ath25_eth[nr]);
+}
+
void __init ath25_serial_setup(u32 mapbase, int irq, unsigned int uartclk)
{
#ifdef CONFIG_SERIAL_8250_CONSOLE
--- a/arch/mips/include/asm/mach-ath25/ath25_platform.h
+++ b/arch/mips/include/asm/mach-ath25/ath25_platform.h
@@ -71,4 +71,15 @@ struct ar231x_board_config {
const char *radio;
};
+/*
+ * Platform device information for the Ethernet MAC
+ */
+struct ar231x_eth {
+ void (*reset_set)(u32);
+ void (*reset_clear)(u32);
+ u32 reset_mac;
+ u32 reset_phy;
+ char *macaddr;
+};
+
#endif /* __ASM_MACH_ATH25_PLATFORM_H */
Reference in New Issue View Git Blame Copy Permalink