diff options
Diffstat (limited to 'drivers/net/arm/ks8695net.c')
| -rw-r--r-- | drivers/net/arm/ks8695net.c | 1675 |
1 files changed, 1675 insertions, 0 deletions
diff --git a/drivers/net/arm/ks8695net.c b/drivers/net/arm/ks8695net.c new file mode 100644 index 00000000000..9ad22d1b00f --- /dev/null +++ b/drivers/net/arm/ks8695net.c @@ -0,0 +1,1675 @@ +/* + * Micrel KS8695 (Centaur) Ethernet. + * + * 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. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * Copyright 2008 Simtec Electronics + * Daniel Silverstone <dsilvers@simtec.co.uk> + * Vincent Sanders <vince@simtec.co.uk> + */ + +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/init.h> +#include <linux/skbuff.h> +#include <linux/spinlock.h> +#include <linux/crc32.h> +#include <linux/mii.h> +#include <linux/ethtool.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/irq.h> +#include <linux/io.h> + +#include <asm/irq.h> + +#include <mach/regs-switch.h> +#include <mach/regs-misc.h> + +#include "ks8695net.h" + +#define MODULENAME "ks8695_ether" +#define MODULEVERSION "1.01" + +/* + * Transmit and device reset timeout, default 5 seconds. + */ +static int watchdog = 5000; + +/* Hardware structures */ + +/** + * struct rx_ring_desc - Receive descriptor ring element + * @status: The status of the descriptor element (E.g. who owns it) + * @length: The number of bytes in the block pointed to by data_ptr + * @data_ptr: The physical address of the data block to receive into + * @next_desc: The physical address of the next descriptor element. + */ +struct rx_ring_desc { + __le32 status; + __le32 length; + __le32 data_ptr; + __le32 next_desc; +}; + +/** + * struct tx_ring_desc - Transmit descriptor ring element + * @owner: Who owns the descriptor + * @status: The number of bytes in the block pointed to by data_ptr + * @data_ptr: The physical address of the data block to receive into + * @next_desc: The physical address of the next descriptor element. + */ +struct tx_ring_desc { + __le32 owner; + __le32 status; + __le32 data_ptr; + __le32 next_desc; +}; + +/** + * struct ks8695_skbuff - sk_buff wrapper for rx/tx rings. + * @skb: The buffer in the ring + * @dma_ptr: The mapped DMA pointer of the buffer + * @length: The number of bytes mapped to dma_ptr + */ +struct ks8695_skbuff { + struct sk_buff *skb; + dma_addr_t dma_ptr; + u32 length; +}; + +/* Private device structure */ + +#define MAX_TX_DESC 8 +#define MAX_TX_DESC_MASK 0x7 +#define MAX_RX_DESC 16 +#define MAX_RX_DESC_MASK 0xf + +#define MAX_RXBUF_SIZE 0x700 + +#define TX_RING_DMA_SIZE (sizeof(struct tx_ring_desc) * MAX_TX_DESC) +#define RX_RING_DMA_SIZE (sizeof(struct rx_ring_desc) * MAX_RX_DESC) +#define RING_DMA_SIZE (TX_RING_DMA_SIZE + RX_RING_DMA_SIZE) + +/** + * enum ks8695_dtype - Device type + * @KS8695_DTYPE_WAN: This device is a WAN interface + * @KS8695_DTYPE_LAN: This device is a LAN interface + * @KS8695_DTYPE_HPNA: This device is an HPNA interface + */ +enum ks8695_dtype { + KS8695_DTYPE_WAN, + KS8695_DTYPE_LAN, + KS8695_DTYPE_HPNA, +}; + +/** + * struct ks8695_priv - Private data for the KS8695 Ethernet + * @in_suspend: Flag to indicate if we're suspending/resuming + * @ndev: The net_device for this interface + * @dev: The platform device object for this interface + * @dtype: The type of this device + * @io_regs: The ioremapped registers for this interface + * @rx_irq_name: The textual name of the RX IRQ from the platform data + * @tx_irq_name: The textual name of the TX IRQ from the platform data + * @link_irq_name: The textual name of the link IRQ from the + * platform data if available + * @rx_irq: The IRQ number for the RX IRQ + * @tx_irq: The IRQ number for the TX IRQ + * @link_irq: The IRQ number for the link IRQ if available + * @regs_req: The resource request for the registers region + * @phyiface_req: The resource request for the phy/switch region + * if available + * @phyiface_regs: The ioremapped registers for the phy/switch if available + * @ring_base: The base pointer of the dma coherent memory for the rings + * @ring_base_dma: The DMA mapped equivalent of ring_base + * @tx_ring: The pointer in ring_base of the TX ring + * @tx_ring_used: The number of slots in the TX ring which are occupied + * @tx_ring_next_slot: The next slot to fill in the TX ring + * @tx_ring_dma: The DMA mapped equivalent of tx_ring + * @tx_buffers: The sk_buff mappings for the TX ring + * @txq_lock: A lock to protect the tx_buffers tx_ring_used etc variables + * @rx_ring: The pointer in ring_base of the RX ring + * @rx_ring_dma: The DMA mapped equivalent of rx_ring + * @rx_buffers: The sk_buff mappings for the RX ring + * @next_rx_desc_read: The next RX descriptor to read from on IRQ + * @msg_enable: The flags for which messages to emit + */ +struct ks8695_priv { + int in_suspend; + struct net_device *ndev; + struct device *dev; + enum ks8695_dtype dtype; + void __iomem *io_regs; + + const char *rx_irq_name, *tx_irq_name, *link_irq_name; + int rx_irq, tx_irq, link_irq; + + struct resource *regs_req, *phyiface_req; + void __iomem *phyiface_regs; + + void *ring_base; + dma_addr_t ring_base_dma; + + struct tx_ring_desc *tx_ring; + int tx_ring_used; + int tx_ring_next_slot; + dma_addr_t tx_ring_dma; + struct ks8695_skbuff tx_buffers[MAX_TX_DESC]; + spinlock_t txq_lock; + + struct rx_ring_desc *rx_ring; + dma_addr_t rx_ring_dma; + struct ks8695_skbuff rx_buffers[MAX_RX_DESC]; + int next_rx_desc_read; + + int msg_enable; +}; + +/* Register access */ + +/** + * ks8695_readreg - Read from a KS8695 ethernet register + * @ksp: The device to read from + * @reg: The register to read + */ +static inline u32 +ks8695_readreg(struct ks8695_priv *ksp, int reg) +{ + return readl(ksp->io_regs + reg); +} + +/** + * ks8695_writereg - Write to a KS8695 ethernet register + * @ksp: The device to write to + * @reg: The register to write + * @value: The value to write to the register + */ +static inline void +ks8695_writereg(struct ks8695_priv *ksp, int reg, u32 value) +{ + writel(value, ksp->io_regs + reg); +} + +/* Utility functions */ + +/** + * ks8695_port_type - Retrieve port-type as user-friendly string + * @ksp: The device to return the type for + * + * Returns a string indicating which of the WAN, LAN or HPNA + * ports this device is likely to represent. + */ +static const char * +ks8695_port_type(struct ks8695_priv *ksp) +{ + switch (ksp->dtype) { + case KS8695_DTYPE_LAN: + return "LAN"; + case KS8695_DTYPE_WAN: + return "WAN"; + case KS8695_DTYPE_HPNA: + return "HPNA"; + } + + return "UNKNOWN"; +} + +/** + * ks8695_update_mac - Update the MAC registers in the device + * @ksp: The device to update + * + * Updates the MAC registers in the KS8695 device from the address in the + * net_device structure associated with this interface. + */ +static void +ks8695_update_mac(struct ks8695_priv *ksp) +{ + /* Update the HW with the MAC from the net_device */ + struct net_device *ndev = ksp->ndev; + u32 machigh, maclow; + + maclow = ((ndev->dev_addr[2] << 24) | (ndev->dev_addr[3] << 16) | + (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5] << 0)); + machigh = ((ndev->dev_addr[0] << 8) | (ndev->dev_addr[1] << 0)); + + ks8695_writereg(ksp, KS8695_MAL, maclow); + ks8695_writereg(ksp, KS8695_MAH, machigh); + +} + +/** + * ks8695_refill_rxbuffers - Re-fill the RX buffer ring + * @ksp: The device to refill + * + * Iterates the RX ring of the device looking for empty slots. + * For each empty slot, we allocate and map a new SKB and give it + * to the hardware. + * This can be called from interrupt context safely. + */ +static void +ks8695_refill_rxbuffers(struct ks8695_priv *ksp) +{ + /* Run around the RX ring, filling in any missing sk_buff's */ + int buff_n; + + for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) { + if (!ksp->rx_buffers[buff_n].skb) { + struct sk_buff *skb = dev_alloc_skb(MAX_RXBUF_SIZE); + dma_addr_t mapping; + + ksp->rx_buffers[buff_n].skb = skb; + if (skb == NULL) { + /* Failed to allocate one, perhaps + * we'll try again later. + */ + break; + } + + mapping = dma_map_single(ksp->dev, skb->data, + MAX_RXBUF_SIZE, + DMA_FROM_DEVICE); + if (unlikely(dma_mapping_error(ksp->dev, mapping))) { + /* Failed to DMA map this SKB, try later */ + dev_kfree_skb_irq(skb); + ksp->rx_buffers[buff_n].skb = NULL; + break; + } + ksp->rx_buffers[buff_n].dma_ptr = mapping; + skb->dev = ksp->ndev; + ksp->rx_buffers[buff_n].length = MAX_RXBUF_SIZE; + + /* Record this into the DMA ring */ + ksp->rx_ring[buff_n].data_ptr = cpu_to_le32(mapping); + ksp->rx_ring[buff_n].length = + cpu_to_le32(MAX_RXBUF_SIZE); + + wmb(); + + /* And give ownership over to the hardware */ + ksp->rx_ring[buff_n].status = cpu_to_le32(RDES_OWN); + } + } +} + +/* Maximum number of multicast addresses which the KS8695 HW supports */ +#define KS8695_NR_ADDRESSES 16 + +/** + * ks8695_init_partial_multicast - Init the mcast addr registers + * @ksp: The device to initialise + * @addr: The multicast address list to use + * @nr_addr: The number of addresses in the list + * + * This routine is a helper for ks8695_set_multicast - it writes + * the additional-address registers in the KS8695 ethernet device + * and cleans up any others left behind. + */ +static void +ks8695_init_partial_multicast(struct ks8695_priv *ksp, + struct dev_mc_list *addr, + int nr_addr) +{ + u32 low, high; + int i; + + for (i = 0; i < nr_addr; i++, addr = addr->next) { + /* Ran out of addresses? */ + if (!addr) + break; + /* Ran out of space in chip? */ + BUG_ON(i == KS8695_NR_ADDRESSES); + + low = (addr->dmi_addr[2] << 24) | (addr->dmi_addr[3] << 16) | + (addr->dmi_addr[4] << 8) | (addr->dmi_addr[5]); + high = (addr->dmi_addr[0] << 8) | (addr->dmi_addr[1]); + + ks8695_writereg(ksp, KS8695_AAL_(i), low); + ks8695_writereg(ksp, KS8695_AAH_(i), AAH_E | high); + } + + /* Clear the remaining Additional Station Addresses */ + for (; i < KS8695_NR_ADDRESSES; i++) { + ks8695_writereg(ksp, KS8695_AAL_(i), 0); + ks8695_writereg(ksp, KS8695_AAH_(i), 0); + } +} + +/* Interrupt handling */ + +/** + * ks8695_tx_irq - Transmit IRQ handler + * @irq: The IRQ which went off (ignored) + * @dev_id: The net_device for the interrupt + * + * Process the TX ring, clearing out any transmitted slots. + * Allows the net_device to pass us new packets once slots are + * freed. + */ +static irqreturn_t +ks8695_tx_irq(int irq, void *dev_id) +{ + struct net_device *ndev = (struct net_device *)dev_id; + struct ks8695_priv *ksp = netdev_priv(ndev); + int buff_n; + + for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) { + if (ksp->tx_buffers[buff_n].skb && + !(ksp->tx_ring[buff_n].owner & cpu_to_le32(TDES_OWN))) { + rmb(); + /* An SKB which is not owned by HW is present */ + /* Update the stats for the net_device */ + ndev->stats.tx_packets++; + ndev->stats.tx_bytes += ksp->tx_buffers[buff_n].length; + + /* Free the packet from the ring */ + ksp->tx_ring[buff_n].data_ptr = 0; + + /* Free the sk_buff */ + dma_unmap_single(ksp->dev, + ksp->tx_buffers[buff_n].dma_ptr, + ksp->tx_buffers[buff_n].length, + DMA_TO_DEVICE); + dev_kfree_skb_irq(ksp->tx_buffers[buff_n].skb); + ksp->tx_buffers[buff_n].skb = NULL; + ksp->tx_ring_used--; + } + } + + netif_wake_queue(ndev); + + return IRQ_HANDLED; +} + +/** + * ks8695_rx_irq - Receive IRQ handler + * @irq: The IRQ which went off (ignored) + * @dev_id: The net_device for the interrupt + * + * Process the RX ring, passing any received packets up to the + * host. If we received anything other than errors, we then + * refill the ring. + */ +static irqreturn_t +ks8695_rx_irq(int irq, void *dev_id) +{ + struct net_device *ndev = (struct net_device *)dev_id; + struct ks8695_priv *ksp = netdev_priv(ndev); + struct sk_buff *skb; + int buff_n; + u32 flags; + int pktlen; + int last_rx_processed = -1; + + buff_n = ksp->next_rx_desc_read; + do { + if (ksp->rx_buffers[buff_n].skb && + !(ksp->rx_ring[buff_n].status & cpu_to_le32(RDES_OWN))) { + rmb(); + flags = le32_to_cpu(ksp->rx_ring[buff_n].status); + /* Found an SKB which we own, this means we + * received a packet + */ + if ((flags & (RDES_FS | RDES_LS)) != + (RDES_FS | RDES_LS)) { + /* This packet is not the first and + * the last segment. Therefore it is + * a "spanning" packet and we can't + * handle it + */ + goto rx_failure; + } + + if (flags & (RDES_ES | RDES_RE)) { + /* It's an error packet */ + ndev->stats.rx_errors++; + if (flags & RDES_TL) + ndev->stats.rx_length_errors++; + if (flags & RDES_RF) + ndev->stats.rx_length_errors++; + if (flags & RDES_CE) + ndev->stats.rx_crc_errors++; + if (flags & RDES_RE) + ndev->stats.rx_missed_errors++; + + goto rx_failure; + } + + pktlen = flags & RDES_FLEN; + pktlen -= 4; /* Drop the CRC */ + + /* Retrieve the sk_buff */ + skb = ksp->rx_buffers[buff_n].skb; + + /* Clear it from the ring */ + ksp->rx_buffers[buff_n].skb = NULL; + ksp->rx_ring[buff_n].data_ptr = 0; + + /* Unmap the SKB */ + dma_unmap_single(ksp->dev, + ksp->rx_buffers[buff_n].dma_ptr, + ksp->rx_buffers[buff_n].length, + DMA_FROM_DEVICE); + + /* Relinquish the SKB to the network layer */ + skb_put(skb, pktlen); + skb->protocol = eth_type_trans(skb, ndev); + netif_rx(skb); + + /* Record stats */ + ndev->last_rx = jiffies; + ndev->stats.rx_packets++; + ndev->stats.rx_bytes += pktlen; + goto rx_finished; + +rx_failure: + /* This ring entry is an error, but we can + * re-use the skb + */ + /* Give the ring entry back to the hardware */ + ksp->rx_ring[buff_n].status = cpu_to_le32(RDES_OWN); +rx_finished: + /* And note this as processed so we can start + * from here next time + */ + last_rx_processed = buff_n; + } else { + /* Ran out of things to process, stop now */ + break; + } + buff_n = (buff_n + 1) & MAX_RX_DESC_MASK; + } while (buff_n != ksp->next_rx_desc_read); + + /* And note which RX descriptor we last did anything with */ + if (likely(last_rx_processed != -1)) + ksp->next_rx_desc_read = + (last_rx_processed + 1) & MAX_RX_DESC_MASK; + + /* And refill the buffers */ + ks8695_refill_rxbuffers(ksp); + + /* Kick the RX DMA engine, in case it became suspended */ + ks8695_writereg(ksp, KS8695_DRSC, 0); + + return IRQ_HANDLED; +} + +/** + * ks8695_link_irq - Link change IRQ handler + * @irq: The IRQ which went off (ignored) + * @dev_id: The net_device for the interrupt + * + * The WAN interface can generate an IRQ when the link changes, + * report this to the net layer and the user. + */ +static irqreturn_t +ks8695_link_irq(int irq, void *dev_id) +{ + struct net_device *ndev = (struct net_device *)dev_id; + struct ks8695_priv *ksp = netdev_priv(ndev); + u32 ctrl; + + ctrl = readl(ksp->phyiface_regs + KS8695_WMC); + if (ctrl & WMC_WLS) { + netif_carrier_on(ndev); + if (netif_msg_link(ksp)) + dev_info(ksp->dev, + "%s: Link is now up (10%sMbps/%s-duplex)\n", + ndev->name, + (ctrl & WMC_WSS) ? "0" : "", + (ctrl & WMC_WDS) ? "Full" : "Half"); + } else { + netif_carrier_off(ndev); + if (netif_msg_link(ksp)) + dev_info(ksp->dev, "%s: Link is now down.\n", + ndev->name); + } + + return IRQ_HANDLED; +} + + +/* KS8695 Device functions */ + +/** + * ks8695_reset - Reset a KS8695 ethernet interface + * @ksp: The interface to reset + * + * Perform an engine reset of the interface and re-program it + * with sensible defaults. + */ +static void +ks8695_reset(struct ks8695_priv *ksp) +{ + int reset_timeout = watchdog; + /* Issue the reset via the TX DMA control register */ + ks8695_writereg(ksp, KS8695_DTXC, DTXC_TRST); + while (reset_timeout--) { + if (!(ks8695_readreg(ksp, KS8695_DTXC) & DTXC_TRST)) + break; + msleep(1); + } + + if (reset_timeout == 0) { + dev_crit(ksp->dev, + "Timeout waiting for DMA engines to reset\n"); + /* And blithely carry on */ + } + + /* Definitely wait long enough before attempting to program + * the engines + */ + msleep(10); + + /* RX: unicast and broadcast */ + ks8695_writereg(ksp, KS8695_DRXC, DRXC_RU | DRXC_RB); + /* TX: pad and add CRC */ + ks8695_writereg(ksp, KS8695_DTXC, DTXC_TEP | DTXC_TAC); +} + +/** + * ks8695_shutdown - Shut down a KS8695 ethernet interface + * @ksp: The interface to shut down + * + * This disables packet RX/TX, cleans up IRQs, drains the rings, + * and basically places the interface into a clean shutdown + * state. + */ +static void +ks8695_shutdown(struct ks8695_priv *ksp) +{ + u32 ctrl; + int buff_n; + + /* Disable packet transmission */ + ctrl = ks8695_readreg(ksp, KS8695_DTXC); + ks8695_writereg(ksp, KS8695_DTXC, ctrl & ~DTXC_TE); + + /* Disable packet reception */ + ctrl = ks8695_readreg(ksp, KS8695_DRXC); + ks8695_writereg(ksp, KS8695_DRXC, ctrl & ~DRXC_RE); + + /* Release the IRQs */ + free_irq(ksp->rx_irq, ksp->ndev); + free_irq(ksp->tx_irq, ksp->ndev); + if (ksp->link_irq != -1) + free_irq(ksp->link_irq, ksp->ndev); + + /* Throw away any pending TX packets */ + for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) { + if (ksp->tx_buffers[buff_n].skb) { + /* Remove this SKB from the TX ring */ + ksp->tx_ring[buff_n].owner = 0; + ksp->tx_ring[buff_n].status = 0; + ksp->tx_ring[buff_n].data_ptr = 0; + + /* Unmap and bin this SKB */ + dma_unmap_single(ksp->dev, + ksp->tx_buffers[buff_n].dma_ptr, + ksp->tx_buffers[buff_n].length, + DMA_TO_DEVICE); + dev_kfree_skb_irq(ksp->tx_buffers[buff_n].skb); + ksp->tx_buffers[buff_n].skb = NULL; + } + } + + /* Purge the RX buffers */ + for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) { + if (ksp->rx_buffers[buff_n].skb) { + /* Remove the SKB from the RX ring */ + ksp->rx_ring[buff_n].status = 0; + ksp->rx_ring[buff_n].data_ptr = 0; + + /* Unmap and bin the SKB */ + dma_unmap_single(ksp->dev, + ksp->rx_buffers[buff_n].dma_ptr, + ksp->rx_buffers[buff_n].length, + DMA_FROM_DEVICE); + dev_kfree_skb_irq(ksp->rx_buffers[buff_n].skb); + ksp->rx_buffers[buff_n].skb = NULL; + } + } +} + + +/** + * ks8695_setup_irq - IRQ setup helper function + * @irq: The IRQ number to claim + * @irq_name: The name to give the IRQ claimant + * @handler: The function to call to handle the IRQ + * @ndev: The net_device to pass in as the dev_id argument to the handler + * + * Return 0 on success. + */ +static int +ks8695_setup_irq(int irq, const char *irq_name, + irq_handler_t handler, struct net_device *ndev) +{ + int ret; + + ret = request_irq(irq, handler, IRQF_SHARED, irq_name, ndev); + + if (ret) { + dev_err(&ndev->dev, "failure to request IRQ %d\n", irq); + return ret; + } + + return 0; +} + +/** + * ks8695_init_net - Initialise a KS8695 ethernet interface + * @ksp: The interface to initialise + * + * This routine fills the RX ring, initialises the DMA engines, + * allocates the IRQs and then starts the packet TX and RX + * engines. + */ +static int +ks8695_init_net(struct ks8695_priv *ksp) +{ + int ret; + u32 ctrl; + + ks8695_refill_rxbuffers(ksp); + + /* Initialise the DMA engines */ + ks8695_writereg(ksp, KS8695_RDLB, (u32) ksp->rx_ring_dma); + ks8695_writereg(ksp, KS8695_TDLB, (u32) ksp->tx_ring_dma); + + /* Request the IRQs */ + ret = ks8695_setup_irq(ksp->rx_irq, ksp->rx_irq_name, + ks8695_rx_irq, ksp->ndev); + if (ret) + return ret; + ret = ks8695_setup_irq(ksp->tx_irq, ksp->tx_irq_name, + ks8695_tx_irq, ksp->ndev); + if (ret) + return ret; + if (ksp->link_irq != -1) { + ret = ks8695_setup_irq(ksp->link_irq, ksp->link_irq_name, + ks8695_link_irq, ksp->ndev); + if (ret) + return ret; + } + + /* Set up the ring indices */ + ksp->next_rx_desc_read = 0; + ksp->tx_ring_next_slot = 0; + ksp->tx_ring_used = 0; + + /* Bring up transmission */ + ctrl = ks8695_readreg(ksp, KS8695_DTXC); + /* Enable packet transmission */ + ks8695_writereg(ksp, KS8695_DTXC, ctrl | DTXC_TE); + + /* Bring up the reception */ + ctrl = ks8695_readreg(ksp, KS8695_DRXC); + /* Enable packet reception */ + ks8695_writereg(ksp, KS8695_DRXC, ctrl | DRXC_RE); + /* And start the DMA engine */ + ks8695_writereg(ksp, KS8695_DRSC, 0); + + /* All done */ + return 0; +} + +/** + * ks8695_release_device - HW resource release for KS8695 e-net + * @ksp: The device to be freed + * + * This unallocates io memory regions, dma-coherent regions etc + * which were allocated in ks8695_probe. + */ +static void +ks8695_release_device(struct ks8695_priv *ksp) +{ + /* Unmap the registers */ + iounmap(ksp->io_regs); + if (ksp->phyiface_regs) + iounmap(ksp->phyiface_regs); + + /* And release the request */ + release_resource(ksp->regs_req); + kfree(ksp->regs_req); + if (ksp->phyiface_req) { + release_resource(ksp->phyiface_req); + kfree(ksp->phyiface_req); + } + + /* Free the ring buffers */ + dma_free_coherent(ksp->dev, RING_DMA_SIZE, + ksp->ring_base, ksp->ring_base_dma); +} + +/* Ethtool support */ + +/** + * ks8695_get_msglevel - Get the messages enabled for emission + * @ndev: The network device to read from + */ +static u32 +ks8695_get_msglevel(struct net_device *ndev) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + + return ksp->msg_enable; +} + +/** + * ks8695_set_msglevel - Set the messages enabled for emission + * @ndev: The network device to configure + * @value: The messages to set for emission + */ +static void +ks8695_set_msglevel(struct net_device *ndev, u32 value) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + + ksp->msg_enable = value; +} + +/** + * ks8695_get_settings - Get device-specific settings. + * @ndev: The network device to read settings from + * @cmd: The ethtool structure to read into + */ +static int +ks8695_get_settings(struct net_device *ndev, struct ethtool_cmd *cmd) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + u32 ctrl; + + /* All ports on the KS8695 support these... */ + cmd->supported = (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full | + SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full | + SUPPORTED_TP | SUPPORTED_MII); + cmd->transceiver = XCVR_INTERNAL; + + /* Port specific extras */ + switch (ksp->dtype) { + case KS8695_DTYPE_HPNA: + cmd->phy_address = 0; + /* not supported for HPNA */ + cmd->autoneg = AUTONEG_DISABLE; + + /* BUG: Erm, dtype hpna implies no phy regs */ + /* + ctrl = readl(KS8695_MISC_VA + KS8695_HMC); + cmd->speed = (ctrl & HMC_HSS) ? SPEED_100 : SPEED_10; + cmd->duplex = (ctrl & HMC_HDS) ? DUPLEX_FULL : DUPLEX_HALF; + */ + return -EOPNOTSUPP; + case KS8695_DTYPE_WAN: + cmd->advertising = ADVERTISED_TP | ADVERTISED_MII; + cmd->port = PORT_MII; + cmd->supported |= (SUPPORTED_Autoneg | SUPPORTED_Pause); + cmd->phy_address = 0; + + ctrl = readl(ksp->phyiface_regs + KS8695_WMC); + if ((ctrl & WMC_WAND) == 0) { + /* auto-negotiation is enabled */ + cmd->advertising |= ADVERTISED_Autoneg; + if (ctrl & WMC_WANA100F) + cmd->advertising |= ADVERTISED_100baseT_Full; + if (ctrl & WMC_WANA100H) + cmd->advertising |= ADVERTISED_100baseT_Half; + if (ctrl & WMC_WANA10F) + cmd->advertising |= ADVERTISED_10baseT_Full; + if (ctrl & WMC_WANA10H) + cmd->advertising |= ADVERTISED_10baseT_Half; + if (ctrl & WMC_WANAP) + cmd->advertising |= ADVERTISED_Pause; + cmd->autoneg = AUTONEG_ENABLE; + + cmd->speed = (ctrl & WMC_WSS) ? SPEED_100 : SPEED_10; + cmd->duplex = (ctrl & WMC_WDS) ? + DUPLEX_FULL : DUPLEX_HALF; + } else { + /* auto-negotiation is disabled */ + cmd->autoneg = AUTONEG_DISABLE; + + cmd->speed = (ctrl & WMC_WANF100) ? + SPEED_100 : SPEED_10; + cmd->duplex = (ctrl & WMC_WANFF) ? + DUPLEX_FULL : DUPLEX_HALF; + } + break; + case KS8695_DTYPE_LAN: + return -EOPNOTSUPP; + } + + return 0; +} + +/** + * ks8695_set_settings - Set device-specific settings. + * @ndev: The network device to configure + * @cmd: The settings to configure + */ +static int +ks8695_set_settings(struct net_device *ndev, struct ethtool_cmd *cmd) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + u32 ctrl; + + if ((cmd->speed != SPEED_10) && (cmd->speed != SPEED_100)) + return -EINVAL; + if ((cmd->duplex != DUPLEX_HALF) && (cmd->duplex != DUPLEX_FULL)) + return -EINVAL; + if (cmd->port != PORT_MII) + return -EINVAL; + if (cmd->transceiver != XCVR_INTERNAL) + return -EINVAL; + if ((cmd->autoneg != AUTONEG_DISABLE) && + (cmd->autoneg != AUTONEG_ENABLE)) + return -EINVAL; + + if (cmd->autoneg == AUTONEG_ENABLE) { + if ((cmd->advertising & (ADVERTISED_10baseT_Half | + ADVERTISED_10baseT_Full | + ADVERTISED_100baseT_Half | + ADVERTISED_100baseT_Full)) == 0) + return -EINVAL; + + switch (ksp->dtype) { + case KS8695_DTYPE_HPNA: + /* HPNA does not support auto-negotiation. */ + return -EINVAL; + case KS8695_DTYPE_WAN: + ctrl = readl(ksp->phyiface_regs + KS8695_WMC); + + ctrl &= ~(WMC_WAND | WMC_WANA100F | WMC_WANA100H | + WMC_WANA10F | WMC_WANA10H); + if (cmd->advertising & ADVERTISED_100baseT_Full) + ctrl |= WMC_WANA100F; + if (cmd->advertising & ADVERTISED_100baseT_Half) + ctrl |= WMC_WANA100H; + if (cmd->advertising & ADVERTISED_10baseT_Full) + ctrl |= WMC_WANA10F; + if (cmd->advertising & ADVERTISED_10baseT_Half) + ctrl |= WMC_WANA10H; + + /* force a re-negotiation */ + ctrl |= WMC_WANR; + writel(ctrl, ksp->phyiface_regs + KS8695_WMC); + break; + case KS8695_DTYPE_LAN: + return -EOPNOTSUPP; + } + + } else { + switch (ksp->dtype) { + case KS8695_DTYPE_HPNA: + /* BUG: dtype_hpna implies no phy registers */ + /* + ctrl = __raw_readl(KS8695_MISC_VA + KS8695_HMC); + + ctrl &= ~(HMC_HSS | HMC_HDS); + if (cmd->speed == SPEED_100) + ctrl |= HMC_HSS; + if (cmd->duplex == DUPLEX_FULL) + ctrl |= HMC_HDS; + + __raw_writel(ctrl, KS8695_MISC_VA + KS8695_HMC); + */ + return -EOPNOTSUPP; + case KS8695_DTYPE_WAN: + ctrl = readl(ksp->phyiface_regs + KS8695_WMC); + + /* disable auto-negotiation */ + ctrl |= WMC_WAND; + ctrl &= ~(WMC_WANF100 | WMC_WANFF); + + if (cmd->speed == SPEED_100) + ctrl |= WMC_WANF100; + if (cmd->duplex == DUPLEX_FULL) + ctrl |= WMC_WANFF; + + writel(ctrl, ksp->phyiface_regs + KS8695_WMC); + break; + case KS8695_DTYPE_LAN: + return -EOPNOTSUPP; + } + } + + return 0; +} + +/** + * ks8695_nwayreset - Restart the autonegotiation on the port. + * @ndev: The network device to restart autoneotiation on + */ +static int +ks8695_nwayreset(struct net_device *ndev) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + u32 ctrl; + + switch (ksp->dtype) { + case KS8695_DTYPE_HPNA: + /* No phy means no autonegotiation on hpna */ + return -EINVAL; + case KS8695_DTYPE_WAN: + ctrl = readl(ksp->phyiface_regs + KS8695_WMC); + + if ((ctrl & WMC_WAND) == 0) + writel(ctrl | WMC_WANR, + ksp->phyiface_regs + KS8695_WMC); + else + /* auto-negotiation not enabled */ + return -EINVAL; + break; + case KS8695_DTYPE_LAN: + return -EOPNOTSUPP; + } + + return 0; +} + +/** + * ks8695_get_link - Retrieve link status of network interface + * @ndev: The network interface to retrive the link status of. + */ +static u32 +ks8695_get_link(struct net_device *ndev) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + u32 ctrl; + + switch (ksp->dtype) { + case KS8695_DTYPE_HPNA: + /* HPNA always has link */ + return 1; + case KS8695_DTYPE_WAN: + /* WAN we can read the PHY for */ + ctrl = readl(ksp->phyiface_regs + KS8695_WMC); + return ctrl & WMC_WLS; + case KS8695_DTYPE_LAN: + return -EOPNOTSUPP; + } + return 0; +} + +/** + * ks8695_get_pause - Retrieve network pause/flow-control advertising + * @ndev: The device to retrieve settings from + * @param: The structure to fill out with the information + */ +static void +ks8695_get_pause(struct net_device *ndev, struct ethtool_pauseparam *param) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + u32 ctrl; + + switch (ksp->dtype) { + case KS8695_DTYPE_HPNA: + /* No phy link on hpna to configure */ + return; + case KS8695_DTYPE_WAN: + ctrl = readl(ksp->phyiface_regs + KS8695_WMC); + + /* advertise Pause */ + param->autoneg = (ctrl & WMC_WANAP); + + /* current Rx Flow-control */ + ctrl = ks8695_readreg(ksp, KS8695_DRXC); + param->rx_pause = (ctrl & DRXC_RFCE); + + /* current Tx Flow-control */ + ctrl = ks8695_readreg(ksp, KS8695_DTXC); + param->tx_pause = (ctrl & DTXC_TFCE); + break; + case KS8695_DTYPE_LAN: + /* The LAN's "phy" is a direct-attached switch */ + return; + } +} + +/** + * ks8695_set_pause - Configure pause/flow-control + * @ndev: The device to configure + * @param: The pause parameters to set + * + * TODO: Implement this + */ +static int +ks8695_set_pause(struct net_device *ndev, struct ethtool_pauseparam *param) +{ + return -EOPNOTSUPP; +} + +/** + * ks8695_get_drvinfo - Retrieve driver information + * @ndev: The network device to retrieve info about + * @info: The info structure to fill out. + */ +static void +ks8695_get_drvinfo(struct net_device *ndev, struct ethtool_drvinfo *info) +{ + strlcpy(info->driver, MODULENAME, sizeof(info->driver)); + strlcpy(info->version, MODULEVERSION, sizeof(info->version)); + strlcpy(info->bus_info, ndev->dev.parent->bus_id, + sizeof(info->bus_info)); +} + +static struct ethtool_ops ks8695_ethtool_ops = { + .get_msglevel = ks8695_get_msglevel, + .set_msglevel = ks8695_set_msglevel, + .get_settings = ks8695_get_settings, + .set_settings = ks8695_set_settings, + .nway_reset = ks8695_nwayreset, + .get_link = ks8695_get_link, + .get_pauseparam = ks8695_get_pause, + .set_pauseparam = ks8695_set_pause, + .get_drvinfo = ks8695_get_drvinfo, +}; + +/* Network device interface functions */ + +/** + * ks8695_set_mac - Update MAC in net dev and HW + * @ndev: The network device to update + * @addr: The new MAC address to set + */ +static int +ks8695_set_mac(struct net_device *ndev, void *addr) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + struct sockaddr *address = addr; + + if (!is_valid_ether_addr(address->sa_data)) + return -EADDRNOTAVAIL; + + memcpy(ndev->dev_addr, address->sa_data, ndev->addr_len); + + ks8695_update_mac(ksp); + + dev_dbg(ksp->dev, "%s: Updated MAC address to %pM\n", + ndev->name, ndev->dev_addr); + + return 0; +} + +/** + * ks8695_set_multicast - Set up the multicast behaviour of the interface + * @ndev: The net_device to configure + * + * This routine, called by the net layer, configures promiscuity + * and multicast reception behaviour for the interface. + */ +static void +ks8695_set_multicast(struct net_device *ndev) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + u32 ctrl; + + ctrl = ks8695_readreg(ksp, KS8695_DRXC); + + if (ndev->flags & IFF_PROMISC) { + /* enable promiscuous mode */ + ctrl |= DRXC_RA; + } else if (ndev->flags & ~IFF_PROMISC) { + /* disable promiscuous mode */ + ctrl &= ~DRXC_RA; + } + + if (ndev->flags & IFF_ALLMULTI) { + /* enable all multicast mode */ + ctrl |= DRXC_RM; + } else if (ndev->mc_count > KS8695_NR_ADDRESSES) { + /* more specific multicast addresses than can be + * handled in hardware + */ + ctrl |= DRXC_RM; + } else { + /* enable specific multicasts */ + ctrl &= ~DRXC_RM; + ks8695_init_partial_multicast(ksp, ndev->mc_list, + ndev->mc_count); + } + + ks8695_writereg(ksp, KS8695_DRXC, ctrl); +} + +/** + * ks8695_timeout - Handle a network tx/rx timeout. + * @ndev: The net_device which timed out. + * + * A network transaction timed out, reset the device. + */ +static void +ks8695_timeout(struct net_device *ndev) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + + netif_stop_queue(ndev); + ks8695_shutdown(ksp); + + ks8695_reset(ksp); + + ks8695_update_mac(ksp); + + /* We ignore the return from this since it managed to init + * before it probably will be okay to init again. + */ + ks8695_init_net(ksp); + + /* Reconfigure promiscuity etc */ + ks8695_set_multicast(ndev); + + /* And start the TX queue once more */ + netif_start_queue(ndev); +} + +/** + * ks8695_start_xmit - Start a packet transmission + * @skb: The packet to transmit + * @ndev: The network device to send the packet on + * + * This routine, called by the net layer, takes ownership of the + * sk_buff and adds it to the TX ring. It then kicks the TX DMA + * engine to ensure transmission begins. + */ +static int +ks8695_start_xmit(struct sk_buff *skb, struct net_device *ndev) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + int buff_n; + dma_addr_t dmap; + + spin_lock_irq(&ksp->txq_lock); + + if (ksp->tx_ring_used == MAX_TX_DESC) { + /* Somehow we got entered when we have no room */ + spin_unlock_irq(&ksp->txq_lock); + return NETDEV_TX_BUSY; + } + + buff_n = ksp->tx_ring_next_slot; + + BUG_ON(ksp->tx_buffers[buff_n].skb); + + dmap = dma_map_single(ksp->dev, skb->data, skb->len, DMA_TO_DEVICE); + if (unlikely(dma_mapping_error(ksp->dev, dmap))) { + /* Failed to DMA map this SKB, give it back for now */ + spin_unlock_irq(&ksp->txq_lock); + dev_dbg(ksp->dev, "%s: Could not map DMA memory for "\ + "transmission, trying later\n", ndev->name); + return NETDEV_TX_BUSY; + } + + ksp->tx_buffers[buff_n].dma_ptr = dmap; + /* Mapped okay, store the buffer pointer and length for later */ + ksp->tx_buffers[buff_n].skb = skb; + ksp->tx_buffers[buff_n].length = skb->len; + + /* Fill out the TX descriptor */ + ksp->tx_ring[buff_n].data_ptr = + cpu_to_le32(ksp->tx_buffers[buff_n].dma_ptr); + ksp->tx_ring[buff_n].status = + cpu_to_le32(TDES_IC | TDES_FS | TDES_LS | + (skb->len & TDES_TBS)); + + wmb(); + + /* Hand it over to the hardware */ + ksp->tx_ring[buff_n].owner = cpu_to_le32(TDES_OWN); + + if (++ksp->tx_ring_used == MAX_TX_DESC) + netif_stop_queue(ndev); + + ndev->trans_start = jiffies; + + /* Kick the TX DMA in case it decided to go IDLE */ + ks8695_writereg(ksp, KS8695_DTSC, 0); + + /* And update the next ring slot */ + ksp->tx_ring_next_slot = (buff_n + 1) & MAX_TX_DESC_MASK; + + spin_unlock_irq(&ksp->txq_lock); + return NETDEV_TX_OK; +} + +/** + * ks8695_stop - Stop (shutdown) a KS8695 ethernet interface + * @ndev: The net_device to stop + * + * This disables the TX queue and cleans up a KS8695 ethernet + * device. + */ +static int +ks8695_stop(struct net_device *ndev) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + + netif_stop_queue(ndev); + netif_carrier_off(ndev); + + ks8695_shutdown(ksp); + + return 0; +} + +/** + * ks8695_open - Open (bring up) a KS8695 ethernet interface + * @ndev: The net_device to open + * + * This resets, configures the MAC, initialises the RX ring and + * DMA engines and starts the TX queue for a KS8695 ethernet + * device. + */ +static int +ks8695_open(struct net_device *ndev) +{ + struct ks8695_priv *ksp = netdev_priv(ndev); + int ret; + + if (!is_valid_ether_addr(ndev->dev_addr)) + return -EADDRNOTAVAIL; + + ks8695_reset(ksp); + + ks8695_update_mac(ksp); + + ret = ks8695_init_net(ksp); + if (ret) { + ks8695_shutdown(ksp); + return ret; + } + + netif_start_queue(ndev); + + return 0; +} + +/* Platform device driver */ + +/** + * ks8695_init_switch - Init LAN switch to known good defaults. + * @ksp: The device to initialise + * + * This initialises the LAN switch in the KS8695 to a known-good + * set of defaults. + */ +static void __devinit +ks8695_init_switch(struct ks8695_priv *ksp) +{ + u32 ctrl; + + /* Default value for SEC0 according to datasheet */ + ctrl = 0x40819e00; + + /* LED0 = Speed LED1 = Link/Activity */ + ctrl &= ~(SEC0_LLED1S | SEC0_LLED0S); + ctrl |= (LLED0S_LINK | LLED1S_LINK_ACTIVITY); + + /* Enable Switch */ + ctrl |= SEC0_ENABLE; + + writel(ctrl, ksp->phyiface_regs + KS8695_SEC0); + + /* Defaults for SEC1 */ + writel(0x9400100, ksp->phyiface_regs + KS8695_SEC1); +} + +/** + * ks8695_init_wan_phy - Initialise the WAN PHY to sensible defaults + * @ksp: The device to initialise + * + * This initialises a KS8695's WAN phy to sensible values for + * autonegotiation etc. + */ +static void __devinit +ks8695_init_wan_phy(struct ks8695_priv *ksp) +{ + u32 ctrl; + + /* Support auto-negotiation */ + ctrl = (WMC_WANAP | WMC_WANA100F | WMC_WANA100H | + WMC_WANA10F | WMC_WANA10H); + + /* LED0 = Activity , LED1 = Link */ + ctrl |= (WLED0S_ACTIVITY | WLED1S_LINK); + + /* Restart Auto-negotiation */ + ctrl |= WMC_WANR; + + writel(ctrl, ksp->phyiface_regs + KS8695_WMC); + + writel(0, ksp->phyiface_regs + KS8695_WPPM); + writel(0, ksp->phyiface_regs + KS8695_PPS); +} + +static const struct net_device_ops ks8695_netdev_ops = { + .ndo_open = ks8695_open, + .ndo_stop = ks8695_stop, + .ndo_start_xmit = ks8695_start_xmit, + .ndo_tx_timeout = ks8695_timeout, + .ndo_set_mac_address = ks8695_set_mac, + .ndo_set_multicast_list = ks8695_set_multicast, +}; + +/** + * ks8695_probe - Probe and initialise a KS8695 ethernet interface + * @pdev: The platform device to probe + * + * Initialise a KS8695 ethernet device from platform data. + * + * This driver requires at least one IORESOURCE_MEM for the + * registers and two IORESOURCE_IRQ for the RX and TX IRQs + * respectively. It can optionally take an additional + * IORESOURCE_MEM for the switch or phy in the case of the lan or + * wan ports, and an IORESOURCE_IRQ for the link IRQ for the wan + * port. + */ +static int __devinit +ks8695_probe(struct platform_device *pdev) +{ + struct ks8695_priv *ksp; + struct net_device *ndev; + struct resource *regs_res, *phyiface_res; + struct resource *rxirq_res, *txirq_res, *linkirq_res; + int ret = 0; + int buff_n; + u32 machigh, maclow; + + /* Initialise a net_device */ + ndev = alloc_etherdev(sizeof(struct ks8695_priv)); + if (!ndev) { + dev_err(&pdev->dev, "could not allocate device.\n"); + return -ENOMEM; + } + + SET_NETDEV_DEV(ndev, &pdev->dev); + + dev_dbg(&pdev->dev, "ks8695_probe() called\n"); + + /* Configure our private structure a little */ + ksp = netdev_priv(ndev); + memset(ksp, 0, sizeof(struct ks8695_priv)); + + ksp->dev = &pdev->dev; + ksp->ndev = ndev; + ksp->msg_enable = NETIF_MSG_LINK; + + /* Retrieve resources */ + regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + phyiface_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + + rxirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + txirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); + linkirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 2); + + if (!(regs_res && rxirq_res && txirq_res)) { + dev_err(ksp->dev, "insufficient resources\n"); + ret = -ENOENT; + goto failure; + } + + ksp->regs_req = request_mem_region(regs_res->start, + resource_size(regs_res), + pdev->name); + + if (!ksp->regs_req) { + dev_err(ksp->dev, "cannot claim register space\n"); + ret = -EIO; + goto failure; + } + + ksp->io_regs = ioremap(regs_res->start, resource_size(regs_res)); + + if (!ksp->io_regs) { + dev_err(ksp->dev, "failed to ioremap registers\n"); + ret = -EINVAL; + goto failure; + } + + if (phyiface_res) { + ksp->phyiface_req = + request_mem_region(phyiface_res->start, + resource_size(phyiface_res), + phyiface_res->name); + + if (!ksp->phyiface_req) { + dev_err(ksp->dev, + "cannot claim switch register space\n"); + ret = -EIO; + goto failure; + } + + ksp->phyiface_regs = ioremap(phyiface_res->start, + resource_size(phyiface_res)); + + if (!ksp->phyiface_regs) { + dev_err(ksp->dev, + "failed to ioremap switch registers\n"); + ret = -EINVAL; + goto failure; + } + } + + ksp->rx_irq = rxirq_res->start; + ksp->rx_irq_name = rxirq_res->name ? rxirq_res->name : "Ethernet RX"; + ksp->tx_irq = txirq_res->start; + ksp->tx_irq_name = txirq_res->name ? txirq_res->name : "Ethernet TX"; + ksp->link_irq = (linkirq_res ? linkirq_res->start : -1); + ksp->link_irq_name = (linkirq_res && linkirq_res->name) ? + linkirq_res->name : "Ethernet Link"; + + /* driver system setup */ + ndev->netdev_ops = &ks8695_netdev_ops; + SET_ETHTOOL_OPS(ndev, &ks8695_ethtool_ops); + ndev->watchdog_timeo = msecs_to_jiffies(watchdog); + + /* Retrieve the default MAC addr from the chip. */ + /* The bootloader should have left it in there for us. */ + + machigh = ks8695_readreg(ksp, KS8695_MAH); + maclow = ks8695_readreg(ksp, KS8695_MAL); + + ndev->dev_addr[0] = (machigh >> 8) & 0xFF; + ndev->dev_addr[1] = machigh & 0xFF; + ndev->dev_addr[2] = (maclow >> 24) & 0xFF; + ndev->dev_addr[3] = (maclow >> 16) & 0xFF; + ndev->dev_addr[4] = (maclow >> 8) & 0xFF; + ndev->dev_addr[5] = maclow & 0xFF; + + if (!is_valid_ether_addr(ndev->dev_addr)) + dev_warn(ksp->dev, "%s: Invalid ethernet MAC address. Please " + "set using ifconfig\n", ndev->name); + + /* In order to be efficient memory-wise, we allocate both + * rings in one go. + */ + ksp->ring_base = dma_alloc_coherent(&pdev->dev, RING_DMA_SIZE, + &ksp->ring_base_dma, GFP_KERNEL); + if (!ksp->ring_base) { + ret = -ENOMEM; + goto failure; + } + + /* Specify the TX DMA ring buffer */ + ksp->tx_ring = ksp->ring_base; + ksp->tx_ring_dma = ksp->ring_base_dma; + + /* And initialise the queue's lock */ + spin_lock_init(&ksp->txq_lock); + + /* Specify the RX DMA ring buffer */ + ksp->rx_ring = ksp->ring_base + TX_RING_DMA_SIZE; + ksp->rx_ring_dma = ksp->ring_base_dma + TX_RING_DMA_SIZE; + + /* Zero the descriptor rings */ + memset(ksp->tx_ring, 0, TX_RING_DMA_SIZE); + memset(ksp->rx_ring, 0, RX_RING_DMA_SIZE); + + /* Build the rings */ + for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) { + ksp->tx_ring[buff_n].next_desc = + cpu_to_le32(ksp->tx_ring_dma + + (sizeof(struct tx_ring_desc) * + ((buff_n + 1) & MAX_TX_DESC_MASK))); + } + + for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) { + ksp->rx_ring[buff_n].next_desc = + cpu_to_le32(ksp->rx_ring_dma + + (sizeof(struct rx_ring_desc) * + ((buff_n + 1) & MAX_RX_DESC_MASK))); + } + + /* Initialise the port (physically) */ + if (ksp->phyiface_regs && ksp->link_irq == -1) { + ks8695_init_switch(ksp); + ksp->dtype = KS8695_DTYPE_LAN; + } else if (ksp->phyiface_regs && ksp->link_irq != -1) { + ks8695_init_wan_phy(ksp); + ksp->dtype = KS8695_DTYPE_WAN; + } else { + /* No initialisation since HPNA does not have a PHY */ + ksp->dtype = KS8695_DTYPE_HPNA; + } + + /* And bring up the net_device with the net core */ + platform_set_drvdata(pdev, ndev); + ret = register_netdev(ndev); + + if (ret == 0) { + dev_info(ksp->dev, "ks8695 ethernet (%s) MAC: %pM\n", + ks8695_port_type(ksp), ndev->dev_addr); + } else { + /* Report the failure to register the net_device */ + dev_err(ksp->dev, "ks8695net: failed to register netdev.\n"); + goto failure; + } + + /* All is well */ + return 0; + + /* Error exit path */ +failure: + ks8695_release_device(ksp); + free_netdev(ndev); + + return ret; +} + +/** + * ks8695_drv_suspend - Suspend a KS8695 ethernet platform device. + * @pdev: The device to suspend + * @state: The suspend state + * + * This routine detaches and shuts down a KS8695 ethernet device. + */ +static int +ks8695_drv_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct net_device *ndev = platform_get_drvdata(pdev); + struct ks8695_priv *ksp = netdev_priv(ndev); + + ksp->in_suspend = 1; + + if (netif_running(ndev)) { + netif_device_detach(ndev); + ks8695_shutdown(ksp); + } + + return 0; +} + +/** + * ks8695_drv_resume - Resume a KS8695 ethernet platform device. + * @pdev: The device to resume + * + * This routine re-initialises and re-attaches a KS8695 ethernet + * device. + */ +static int +ks8695_drv_resume(struct platform_device *pdev) +{ + struct net_device *ndev = platform_get_drvdata(pdev); + struct ks8695_priv *ksp = netdev_priv(ndev); + + if (netif_running(ndev)) { + ks8695_reset(ksp); + ks8695_init_net(ksp); + ks8695_set_multicast(ndev); + netif_device_attach(ndev); + } + + ksp->in_suspend = 0; + + return 0; +} + +/** + * ks8695_drv_remove - Remove a KS8695 net device on driver unload. + * @pdev: The platform device to remove + * + * This unregisters and releases a KS8695 ethernet device. + */ +static int __devexit +ks8695_drv_remove(struct platform_device *pdev) +{ + struct net_device *ndev = platform_get_drvdata(pdev); + struct ks8695_priv *ksp = netdev_priv(ndev); + + platform_set_drvdata(pdev, NULL); + + unregister_netdev(ndev); + ks8695_release_device(ksp); + free_netdev(ndev); + + dev_dbg(&pdev->dev, "released and freed device\n"); + return 0; +} + +static struct platform_driver ks8695_driver = { + .driver = { + .name = MODULENAME, + .owner = THIS_MODULE, + }, + .probe = ks8695_probe, + .remove = __devexit_p(ks8695_drv_remove), + .suspend = ks8695_drv_suspend, + .resume = ks8695_drv_resume, +}; + +/* Module interface */ + +static int __init +ks8695_init(void) +{ + printk(KERN_INFO "%s Ethernet driver, V%s\n", + MODULENAME, MODULEVERSION); + + return platform_driver_register(&ks8695_driver); +} + +static void __exit +ks8695_cleanup(void) +{ + platform_driver_unregister(&ks8695_driver); +} + +module_init(ks8695_init); +module_exit(ks8695_cleanup); + +MODULE_AUTHOR("Simtec Electronics") +MODULE_DESCRIPTION("Micrel KS8695 (Centaur) Ethernet driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" MODULENAME); + +module_param(watchdog, int, 0400); +MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds"); |