#include "sky2.h"
#define DRV_NAME "sky2"
-#define DRV_VERSION "1.24"
+#define DRV_VERSION "1.25"
#define PFX DRV_NAME " "
/*
#define RX_MAX_PENDING (RX_LE_SIZE/6 - 2)
#define RX_DEF_PENDING RX_MAX_PENDING
-#define TX_RING_SIZE 512
-#define TX_DEF_PENDING 128
-#define MAX_SKB_TX_LE (4 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
+/* This is the worst case number of transmit list elements for a single skb:
+ VLAN + TSO + CKSUM + Data + skb_frags * DMA */
+#define MAX_SKB_TX_LE (4 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
#define TX_MIN_PENDING (MAX_SKB_TX_LE+1)
+#define TX_MAX_PENDING 4096
+#define TX_DEF_PENDING 127
#define STATUS_RING_SIZE 2048 /* 2 ports * (TX + 2*RX) */
#define STATUS_LE_BYTES (STATUS_RING_SIZE*sizeof(struct sky2_status_le))
* hardware and driver list elements
*/
static void sky2_prefetch_init(struct sky2_hw *hw, u32 qaddr,
- u64 addr, u32 last)
+ dma_addr_t addr, u32 last)
{
sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_CTRL), PREF_UNIT_RST_SET);
sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_CTRL), PREF_UNIT_RST_CLR);
- sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_ADDR_HI), addr >> 32);
- sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_ADDR_LO), (u32) addr);
+ sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_ADDR_HI), upper_32_bits(addr));
+ sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_ADDR_LO), lower_32_bits(addr));
sky2_write16(hw, Y2_QADDR(qaddr, PREF_UNIT_LAST_IDX), last);
sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_CTRL), PREF_UNIT_OP_ON);
static inline struct sky2_tx_le *get_tx_le(struct sky2_port *sky2, u16 *slot)
{
struct sky2_tx_le *le = sky2->tx_le + *slot;
+ struct tx_ring_info *re = sky2->tx_ring + *slot;
- *slot = RING_NEXT(*slot, TX_RING_SIZE);
+ *slot = RING_NEXT(*slot, sky2->tx_ring_size);
+ re->flags = 0;
+ re->skb = NULL;
le->ctrl = 0;
return le;
}
le = get_tx_le(sky2, &sky2->tx_prod);
le->addr = 0;
le->opcode = OP_ADDR64 | HW_OWNER;
-}
-
-static inline struct tx_ring_info *tx_le_re(struct sky2_port *sky2,
- struct sky2_tx_le *le)
-{
- return sky2->tx_ring + (le - sky2->tx_le);
+ sky2->tx_last_upper = 0;
}
/* Update chip's next pointer */
}
le = sky2_next_rx(sky2);
- le->addr = cpu_to_le32((u32) map);
+ le->addr = cpu_to_le32(lower_32_bits(map));
le->length = cpu_to_le16(len);
le->opcode = op | HW_OWNER;
}
re->skb = NULL;
}
}
- skb_queue_purge(&sky2->rx_recycle);
}
/* Basic MII support */
struct sk_buff *skb;
int i;
- skb = __skb_dequeue(&sky2->rx_recycle);
- if (!skb)
- skb = netdev_alloc_skb(sky2->netdev, sky2->rx_data_size
- + sky2_rx_pad(sky2->hw));
+ skb = netdev_alloc_skb(sky2->netdev,
+ sky2->rx_data_size + sky2_rx_pad(sky2->hw));
if (!skb)
goto nomem;
sky2->rx_data_size = size;
- skb_queue_head_init(&sky2->rx_recycle);
-
/* Fill Rx ring */
for (i = 0; i < sky2->rx_pending; i++) {
re = sky2->rx_ring + i;
/* must be power of 2 */
sky2->tx_le = pci_alloc_consistent(hw->pdev,
- TX_RING_SIZE *
+ sky2->tx_ring_size *
sizeof(struct sky2_tx_le),
&sky2->tx_le_map);
if (!sky2->tx_le)
goto err_out;
- sky2->tx_ring = kcalloc(TX_RING_SIZE, sizeof(struct tx_ring_info),
+ sky2->tx_ring = kcalloc(sky2->tx_ring_size, sizeof(struct tx_ring_info),
GFP_KERNEL);
if (!sky2->tx_ring)
goto err_out;
sky2_write16(hw, Q_ADDR(txqaddr[port], Q_AL), ECU_TXFF_LEV);
sky2_prefetch_init(hw, txqaddr[port], sky2->tx_le_map,
- TX_RING_SIZE - 1);
+ sky2->tx_ring_size - 1);
#ifdef SKY2_VLAN_TAG_USED
sky2_set_vlan_mode(hw, port, sky2->vlgrp != NULL);
}
if (sky2->tx_le) {
pci_free_consistent(hw->pdev,
- TX_RING_SIZE * sizeof(struct sky2_tx_le),
+ sky2->tx_ring_size * sizeof(struct sky2_tx_le),
sky2->tx_le, sky2->tx_le_map);
sky2->tx_le = NULL;
}
}
/* Modular subtraction in ring */
-static inline int tx_dist(unsigned tail, unsigned head)
+static inline int tx_inuse(const struct sky2_port *sky2)
{
- return (head - tail) & (TX_RING_SIZE - 1);
+ return (sky2->tx_prod - sky2->tx_cons) & (sky2->tx_ring_size - 1);
}
/* Number of list elements available for next tx */
static inline int tx_avail(const struct sky2_port *sky2)
{
- return sky2->tx_pending - tx_dist(sky2->tx_cons, sky2->tx_prod);
+ return sky2->tx_pending - tx_inuse(sky2);
}
/* Estimate of number of transmit list elements required */
return count;
}
+static void sky2_tx_unmap(struct pci_dev *pdev,
+ const struct tx_ring_info *re)
+{
+ if (re->flags & TX_MAP_SINGLE)
+ pci_unmap_single(pdev, pci_unmap_addr(re, mapaddr),
+ pci_unmap_len(re, maplen),
+ PCI_DMA_TODEVICE);
+ else if (re->flags & TX_MAP_PAGE)
+ pci_unmap_page(pdev, pci_unmap_addr(re, mapaddr),
+ pci_unmap_len(re, maplen),
+ PCI_DMA_TODEVICE);
+}
+
/*
* Put one packet in ring for transmit.
* A single packet can generate multiple list elements, and
struct sky2_tx_le *le = NULL;
struct tx_ring_info *re;
unsigned i, len;
- u16 slot;
dma_addr_t mapping;
+ u32 upper;
+ u16 slot;
u16 mss;
u8 ctrl;
dev->name, slot, skb->len);
/* Send high bits if needed */
- if (sizeof(dma_addr_t) > sizeof(u32)) {
+ upper = upper_32_bits(mapping);
+ if (upper != sky2->tx_last_upper) {
le = get_tx_le(sky2, &slot);
- le->addr = cpu_to_le32(upper_32_bits(mapping));
+ le->addr = cpu_to_le32(upper);
+ sky2->tx_last_upper = upper;
le->opcode = OP_ADDR64 | HW_OWNER;
}
}
}
+ re = sky2->tx_ring + slot;
+ re->flags = TX_MAP_SINGLE;
+ pci_unmap_addr_set(re, mapaddr, mapping);
+ pci_unmap_len_set(re, maplen, len);
+
le = get_tx_le(sky2, &slot);
- le->addr = cpu_to_le32((u32) mapping);
+ le->addr = cpu_to_le32(lower_32_bits(mapping));
le->length = cpu_to_le16(len);
le->ctrl = ctrl;
le->opcode = mss ? (OP_LARGESEND | HW_OWNER) : (OP_PACKET | HW_OWNER);
- re = tx_le_re(sky2, le);
- re->skb = skb;
- pci_unmap_addr_set(re, mapaddr, mapping);
- pci_unmap_len_set(re, maplen, len);
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
if (pci_dma_mapping_error(hw->pdev, mapping))
goto mapping_unwind;
- if (sizeof(dma_addr_t) > sizeof(u32)) {
+ upper = upper_32_bits(mapping);
+ if (upper != sky2->tx_last_upper) {
le = get_tx_le(sky2, &slot);
- le->addr = cpu_to_le32(upper_32_bits(mapping));
- le->ctrl = 0;
+ le->addr = cpu_to_le32(upper);
+ sky2->tx_last_upper = upper;
le->opcode = OP_ADDR64 | HW_OWNER;
}
+ re = sky2->tx_ring + slot;
+ re->flags = TX_MAP_PAGE;
+ pci_unmap_addr_set(re, mapaddr, mapping);
+ pci_unmap_len_set(re, maplen, frag->size);
+
le = get_tx_le(sky2, &slot);
- le->addr = cpu_to_le32((u32) mapping);
+ le->addr = cpu_to_le32(lower_32_bits(mapping));
le->length = cpu_to_le16(frag->size);
le->ctrl = ctrl;
le->opcode = OP_BUFFER | HW_OWNER;
-
- re = tx_le_re(sky2, le);
- re->skb = skb;
- pci_unmap_addr_set(re, mapaddr, mapping);
- pci_unmap_len_set(re, maplen, frag->size);
}
+ re->skb = skb;
le->ctrl |= EOP;
sky2->tx_prod = slot;
return NETDEV_TX_OK;
mapping_unwind:
- for (i = sky2->tx_prod; i != slot; i = RING_NEXT(i, TX_RING_SIZE)) {
- le = sky2->tx_le + i;
+ for (i = sky2->tx_prod; i != slot; i = RING_NEXT(i, sky2->tx_ring_size)) {
re = sky2->tx_ring + i;
- switch(le->opcode & ~HW_OWNER) {
- case OP_LARGESEND:
- case OP_PACKET:
- pci_unmap_single(hw->pdev,
- pci_unmap_addr(re, mapaddr),
- pci_unmap_len(re, maplen),
- PCI_DMA_TODEVICE);
- break;
- case OP_BUFFER:
- pci_unmap_page(hw->pdev, pci_unmap_addr(re, mapaddr),
- pci_unmap_len(re, maplen),
- PCI_DMA_TODEVICE);
- break;
- }
+ sky2_tx_unmap(hw->pdev, re);
}
mapping_error:
static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
{
struct net_device *dev = sky2->netdev;
- struct pci_dev *pdev = sky2->hw->pdev;
unsigned idx;
- BUG_ON(done >= TX_RING_SIZE);
+ BUG_ON(done >= sky2->tx_ring_size);
for (idx = sky2->tx_cons; idx != done;
- idx = RING_NEXT(idx, TX_RING_SIZE)) {
- struct sky2_tx_le *le = sky2->tx_le + idx;
+ idx = RING_NEXT(idx, sky2->tx_ring_size)) {
struct tx_ring_info *re = sky2->tx_ring + idx;
+ struct sk_buff *skb = re->skb;
- switch(le->opcode & ~HW_OWNER) {
- case OP_LARGESEND:
- case OP_PACKET:
- pci_unmap_single(pdev,
- pci_unmap_addr(re, mapaddr),
- pci_unmap_len(re, maplen),
- PCI_DMA_TODEVICE);
- break;
- case OP_BUFFER:
- pci_unmap_page(pdev, pci_unmap_addr(re, mapaddr),
- pci_unmap_len(re, maplen),
- PCI_DMA_TODEVICE);
- break;
- }
-
- if (le->ctrl & EOP) {
- struct sk_buff *skb = re->skb;
+ sky2_tx_unmap(sky2->hw->pdev, re);
+ if (skb) {
if (unlikely(netif_msg_tx_done(sky2)))
printk(KERN_DEBUG "%s: tx done %u\n",
dev->name, idx);
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
- if (skb_queue_len(&sky2->rx_recycle) < sky2->rx_pending
- && skb_recycle_check(skb, sky2->rx_data_size
- + sky2_rx_pad(sky2->hw)))
- __skb_queue_head(&sky2->rx_recycle, skb);
- else
- dev_kfree_skb_any(skb);
+ dev_kfree_skb_any(skb);
- sky2->tx_next = RING_NEXT(idx, TX_RING_SIZE);
+ sky2->tx_next = RING_NEXT(idx, sky2->tx_ring_size);
}
}
kfree(sky2->rx_ring);
pci_free_consistent(hw->pdev,
- TX_RING_SIZE * sizeof(struct sky2_tx_le),
+ sky2->tx_ring_size * sizeof(struct sky2_tx_le),
sky2->tx_le, sky2->tx_le_map);
kfree(sky2->tx_ring);
case OP_TXINDEXLE:
/* TX index reports status for both ports */
- BUILD_BUG_ON(TX_RING_SIZE > 0x1000);
sky2_tx_done(hw->dev[0], status & 0xfff);
if (hw->dev[1])
sky2_tx_done(hw->dev[1],
}
/* This should never happen it is a bug. */
-static void sky2_le_error(struct sky2_hw *hw, unsigned port,
- u16 q, unsigned ring_size)
+static void sky2_le_error(struct sky2_hw *hw, unsigned port, u16 q)
{
struct net_device *dev = hw->dev[port];
- struct sky2_port *sky2 = netdev_priv(dev);
- unsigned idx;
- const u64 *le = (q == Q_R1 || q == Q_R2)
- ? (u64 *) sky2->rx_le : (u64 *) sky2->tx_le;
+ u16 idx = sky2_read16(hw, Y2_QADDR(q, PREF_UNIT_GET_IDX));
- idx = sky2_read16(hw, Y2_QADDR(q, PREF_UNIT_GET_IDX));
- printk(KERN_ERR PFX "%s: descriptor error q=%#x get=%u [%llx] put=%u\n",
- dev->name, (unsigned) q, idx, (unsigned long long) le[idx],
- (unsigned) sky2_read16(hw, Y2_QADDR(q, PREF_UNIT_PUT_IDX)));
+ dev_err(&hw->pdev->dev, PFX
+ "%s: descriptor error q=%#x get=%u put=%u\n",
+ dev->name, (unsigned) q, (unsigned) idx,
+ (unsigned) sky2_read16(hw, Y2_QADDR(q, PREF_UNIT_PUT_IDX)));
sky2_write32(hw, Q_ADDR(q, Q_CSR), BMU_CLR_IRQ_CHK);
}
sky2_mac_intr(hw, 1);
if (status & Y2_IS_CHK_RX1)
- sky2_le_error(hw, 0, Q_R1, RX_LE_SIZE);
+ sky2_le_error(hw, 0, Q_R1);
if (status & Y2_IS_CHK_RX2)
- sky2_le_error(hw, 1, Q_R2, RX_LE_SIZE);
+ sky2_le_error(hw, 1, Q_R2);
if (status & Y2_IS_CHK_TXA1)
- sky2_le_error(hw, 0, Q_XA1, TX_RING_SIZE);
+ sky2_le_error(hw, 0, Q_XA1);
if (status & Y2_IS_CHK_TXA2)
- sky2_le_error(hw, 1, Q_XA2, TX_RING_SIZE);
+ sky2_le_error(hw, 1, Q_XA2);
}
static int sky2_poll(struct napi_struct *napi, int work_limit)
ecmd->rx_coalesce_usecs_irq > tmax)
return -EINVAL;
- if (ecmd->tx_max_coalesced_frames >= TX_RING_SIZE-1)
+ if (ecmd->tx_max_coalesced_frames >= sky2->tx_ring_size-1)
return -EINVAL;
if (ecmd->rx_max_coalesced_frames > RX_MAX_PENDING)
return -EINVAL;
ering->rx_max_pending = RX_MAX_PENDING;
ering->rx_mini_max_pending = 0;
ering->rx_jumbo_max_pending = 0;
- ering->tx_max_pending = TX_RING_SIZE - 1;
+ ering->tx_max_pending = TX_MAX_PENDING;
ering->rx_pending = sky2->rx_pending;
ering->rx_mini_pending = 0;
if (ering->rx_pending > RX_MAX_PENDING ||
ering->rx_pending < 8 ||
- ering->tx_pending < MAX_SKB_TX_LE ||
- ering->tx_pending > TX_RING_SIZE - 1)
+ ering->tx_pending < TX_MIN_PENDING ||
+ ering->tx_pending > TX_MAX_PENDING)
return -EINVAL;
sky2_detach(dev);
sky2->rx_pending = ering->rx_pending;
sky2->tx_pending = ering->tx_pending;
+ sky2->tx_ring_size = roundup_pow_of_two(sky2->tx_pending+1);
return sky2_reattach(dev);
}
/* Dump contents of tx ring */
sop = 1;
- for (idx = sky2->tx_next; idx != sky2->tx_prod && idx < TX_RING_SIZE;
- idx = RING_NEXT(idx, TX_RING_SIZE)) {
+ for (idx = sky2->tx_next; idx != sky2->tx_prod && idx < sky2->tx_ring_size;
+ idx = RING_NEXT(idx, sky2->tx_ring_size)) {
const struct sky2_tx_le *le = sky2->tx_le + idx;
u32 a = le32_to_cpu(le->addr);
sky2->wol = wol;
spin_lock_init(&sky2->phy_lock);
+
sky2->tx_pending = TX_DEF_PENDING;
+ sky2->tx_ring_size = roundup_pow_of_two(TX_DEF_PENDING+1);
sky2->rx_pending = RX_DEF_PENDING;
hw->dev[port] = dev;
--- /dev/null
+/*
+ * Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device.
+ *
+ * This is a new flat driver which is based on the original emac_lite
+ * driver from John Williams <john.williams@petalogix.com>.
+ *
+ * 2007-2009 (c) Xilinx, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/io.h>
+
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+
+#define DRIVER_NAME "xilinx_emaclite"
+
+/* Register offsets for the EmacLite Core */
+#define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */
+#define XEL_GIER_OFFSET 0x07F8 /* GIE Register */
+#define XEL_TSR_OFFSET 0x07FC /* Tx status */
+#define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */
+
+#define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */
+#define XEL_RPLR_OFFSET 0x100C /* Rx packet length */
+#define XEL_RSR_OFFSET 0x17FC /* Rx status */
+
+#define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */
+
+/* Global Interrupt Enable Register (GIER) Bit Masks */
+#define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */
+
+/* Transmit Status Register (TSR) Bit Masks */
+#define XEL_TSR_XMIT_BUSY_MASK 0x00000001 /* Tx complete */
+#define XEL_TSR_PROGRAM_MASK 0x00000002 /* Program the MAC address */
+#define XEL_TSR_XMIT_IE_MASK 0x00000008 /* Tx interrupt enable bit */
+#define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000 /* Buffer is active, SW bit
+ * only. This is not documented
+ * in the HW spec */
+
+/* Define for programming the MAC address into the EmacLite */
+#define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)
+
+/* Receive Status Register (RSR) */
+#define XEL_RSR_RECV_DONE_MASK 0x00000001 /* Rx complete */
+#define XEL_RSR_RECV_IE_MASK 0x00000008 /* Rx interrupt enable bit */
+
+/* Transmit Packet Length Register (TPLR) */
+#define XEL_TPLR_LENGTH_MASK 0x0000FFFF /* Tx packet length */
+
+/* Receive Packet Length Register (RPLR) */
+#define XEL_RPLR_LENGTH_MASK 0x0000FFFF /* Rx packet length */
+
+#define XEL_HEADER_OFFSET 12 /* Offset to length field */
+#define XEL_HEADER_SHIFT 16 /* Shift value for length */
+
+/* General Ethernet Definitions */
+#define XEL_ARP_PACKET_SIZE 28 /* Max ARP packet size */
+#define XEL_HEADER_IP_LENGTH_OFFSET 16 /* IP Length Offset */
+
+
+
+#define TX_TIMEOUT (60*HZ) /* Tx timeout is 60 seconds. */
+#define ALIGNMENT 4
+
+/* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */
+#define BUFFER_ALIGN(adr) ((ALIGNMENT - ((u32) adr)) % ALIGNMENT)
+
+/**
+ * struct net_local - Our private per device data
+ * @ndev: instance of the network device
+ * @tx_ping_pong: indicates whether Tx Pong buffer is configured in HW
+ * @rx_ping_pong: indicates whether Rx Pong buffer is configured in HW
+ * @next_tx_buf_to_use: next Tx buffer to write to
+ * @next_rx_buf_to_use: next Rx buffer to read from
+ * @base_addr: base address of the Emaclite device
+ * @reset_lock: lock used for synchronization
+ * @deferred_skb: holds an skb (for transmission at a later time) when the
+ * Tx buffer is not free
+ */
+struct net_local {
+
+ struct net_device *ndev;
+
+ bool tx_ping_pong;
+ bool rx_ping_pong;
+ u32 next_tx_buf_to_use;
+ u32 next_rx_buf_to_use;
+ void __iomem *base_addr;
+
+ spinlock_t reset_lock;
+ struct sk_buff *deferred_skb;
+};
+
+
+/*************************/
+/* EmacLite driver calls */
+/*************************/
+
+/**
+ * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device
+ * @drvdata: Pointer to the Emaclite device private data
+ *
+ * This function enables the Tx and Rx interrupts for the Emaclite device along
+ * with the Global Interrupt Enable.
+ */
+static void xemaclite_enable_interrupts(struct net_local *drvdata)
+{
+ u32 reg_data;
+
+ /* Enable the Tx interrupts for the first Buffer */
+ reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET);
+ out_be32(drvdata->base_addr + XEL_TSR_OFFSET,
+ reg_data | XEL_TSR_XMIT_IE_MASK);
+
+ /* Enable the Tx interrupts for the second Buffer if
+ * configured in HW */
+ if (drvdata->tx_ping_pong != 0) {
+ reg_data = in_be32(drvdata->base_addr +
+ XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
+ out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
+ XEL_TSR_OFFSET,
+ reg_data | XEL_TSR_XMIT_IE_MASK);
+ }
+
+ /* Enable the Rx interrupts for the first buffer */
+ reg_data = in_be32(drvdata->base_addr + XEL_RSR_OFFSET);
+ out_be32(drvdata->base_addr + XEL_RSR_OFFSET,
+ reg_data | XEL_RSR_RECV_IE_MASK);
+
+ /* Enable the Rx interrupts for the second Buffer if
+ * configured in HW */
+ if (drvdata->rx_ping_pong != 0) {
+ reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
+ XEL_RSR_OFFSET);
+ out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
+ XEL_RSR_OFFSET,
+ reg_data | XEL_RSR_RECV_IE_MASK);
+ }
+
+ /* Enable the Global Interrupt Enable */
+ out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK);
+}
+
+/**
+ * xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device
+ * @drvdata: Pointer to the Emaclite device private data
+ *
+ * This function disables the Tx and Rx interrupts for the Emaclite device,
+ * along with the Global Interrupt Enable.
+ */
+static void xemaclite_disable_interrupts(struct net_local *drvdata)
+{
+ u32 reg_data;
+
+ /* Disable the Global Interrupt Enable */
+ out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK);
+
+ /* Disable the Tx interrupts for the first buffer */
+ reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET);
+ out_be32(drvdata->base_addr + XEL_TSR_OFFSET,
+ reg_data & (~XEL_TSR_XMIT_IE_MASK));
+
+ /* Disable the Tx interrupts for the second Buffer
+ * if configured in HW */
+ if (drvdata->tx_ping_pong != 0) {
+ reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
+ XEL_TSR_OFFSET);
+ out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
+ XEL_TSR_OFFSET,
+ reg_data & (~XEL_TSR_XMIT_IE_MASK));
+ }
+
+ /* Disable the Rx interrupts for the first buffer */
+ reg_data = in_be32(drvdata->base_addr + XEL_RSR_OFFSET);
+ out_be32(drvdata->base_addr + XEL_RSR_OFFSET,
+ reg_data & (~XEL_RSR_RECV_IE_MASK));
+
+ /* Disable the Rx interrupts for the second buffer
+ * if configured in HW */
+ if (drvdata->rx_ping_pong != 0) {
+
+ reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
+ XEL_RSR_OFFSET);
+ out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
+ XEL_RSR_OFFSET,
+ reg_data & (~XEL_RSR_RECV_IE_MASK));
+ }
+}
+
+/**
+ * xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address
+ * @src_ptr: Void pointer to the 16-bit aligned source address
+ * @dest_ptr: Pointer to the 32-bit aligned destination address
+ * @length: Number bytes to write from source to destination
+ *
+ * This function writes data from a 16-bit aligned buffer to a 32-bit aligned
+ * address in the EmacLite device.
+ */
+static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr,
+ unsigned length)
+{
+ u32 align_buffer;
+ u32 *to_u32_ptr;
+ u16 *from_u16_ptr, *to_u16_ptr;
+
+ to_u32_ptr = dest_ptr;
+ from_u16_ptr = (u16 *) src_ptr;
+ align_buffer = 0;
+
+ for (; length > 3; length -= 4) {
+ to_u16_ptr = (u16 *) ((void *) &align_buffer);
+ *to_u16_ptr++ = *from_u16_ptr++;
+ *to_u16_ptr++ = *from_u16_ptr++;
+
+ /* Output a word */
+ *to_u32_ptr++ = align_buffer;
+ }
+ if (length) {
+ u8 *from_u8_ptr, *to_u8_ptr;
+
+ /* Set up to output the remaining data */
+ align_buffer = 0;
+ to_u8_ptr = (u8 *) &align_buffer;
+ from_u8_ptr = (u8 *) from_u16_ptr;
+
+ /* Output the remaining data */
+ for (; length > 0; length--)
+ *to_u8_ptr++ = *from_u8_ptr++;
+
+ *to_u32_ptr = align_buffer;
+ }
+}
+
+/**
+ * xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer
+ * @src_ptr: Pointer to the 32-bit aligned source address
+ * @dest_ptr: Pointer to the 16-bit aligned destination address
+ * @length: Number bytes to read from source to destination
+ *
+ * This function reads data from a 32-bit aligned address in the EmacLite device
+ * to a 16-bit aligned buffer.
+ */
+static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr,
+ unsigned length)
+{
+ u16 *to_u16_ptr, *from_u16_ptr;
+ u32 *from_u32_ptr;
+ u32 align_buffer;
+
+ from_u32_ptr = src_ptr;
+ to_u16_ptr = (u16 *) dest_ptr;
+
+ for (; length > 3; length -= 4) {
+ /* Copy each word into the temporary buffer */
+ align_buffer = *from_u32_ptr++;
+ from_u16_ptr = (u16 *)&align_buffer;
+
+ /* Read data from source */
+ *to_u16_ptr++ = *from_u16_ptr++;
+ *to_u16_ptr++ = *from_u16_ptr++;
+ }
+
+ if (length) {
+ u8 *to_u8_ptr, *from_u8_ptr;
+
+ /* Set up to read the remaining data */
+ to_u8_ptr = (u8 *) to_u16_ptr;
+ align_buffer = *from_u32_ptr++;
+ from_u8_ptr = (u8 *) &align_buffer;
+
+ /* Read the remaining data */
+ for (; length > 0; length--)
+ *to_u8_ptr = *from_u8_ptr;
+ }
+}
+
+/**
+ * xemaclite_send_data - Send an Ethernet frame
+ * @drvdata: Pointer to the Emaclite device private data
+ * @data: Pointer to the data to be sent
+ * @byte_count: Total frame size, including header
+ *
+ * This function checks if the Tx buffer of the Emaclite device is free to send
+ * data. If so, it fills the Tx buffer with data for transmission. Otherwise, it
+ * returns an error.
+ *
+ * Return: 0 upon success or -1 if the buffer(s) are full.
+ *
+ * Note: The maximum Tx packet size can not be more than Ethernet header
+ * (14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS.
+ */
+static int xemaclite_send_data(struct net_local *drvdata, u8 *data,
+ unsigned int byte_count)
+{
+ u32 reg_data;
+ void __iomem *addr;
+
+ /* Determine the expected Tx buffer address */
+ addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
+
+ /* If the length is too large, truncate it */
+ if (byte_count > ETH_FRAME_LEN)
+ byte_count = ETH_FRAME_LEN;
+
+ /* Check if the expected buffer is available */
+ reg_data = in_be32(addr + XEL_TSR_OFFSET);
+ if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
+ XEL_TSR_XMIT_ACTIVE_MASK)) == 0) {
+
+ /* Switch to next buffer if configured */
+ if (drvdata->tx_ping_pong != 0)
+ drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET;
+ } else if (drvdata->tx_ping_pong != 0) {
+ /* If the expected buffer is full, try the other buffer,
+ * if it is configured in HW */
+
+ addr = (void __iomem __force *)((u32 __force)addr ^
+ XEL_BUFFER_OFFSET);
+ reg_data = in_be32(addr + XEL_TSR_OFFSET);
+
+ if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
+ XEL_TSR_XMIT_ACTIVE_MASK)) != 0)
+ return -1; /* Buffers were full, return failure */
+ } else
+ return -1; /* Buffer was full, return failure */
+
+ /* Write the frame to the buffer */
+ xemaclite_aligned_write(data, (u32 __force *) addr, byte_count);
+
+ out_be32(addr + XEL_TPLR_OFFSET, (byte_count & XEL_TPLR_LENGTH_MASK));
+
+ /* Update the Tx Status Register to indicate that there is a
+ * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which
+ * is used by the interrupt handler to check whether a frame
+ * has been transmitted */
+ reg_data = in_be32(addr + XEL_TSR_OFFSET);
+ reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK);
+ out_be32(addr + XEL_TSR_OFFSET, reg_data);
+
+ return 0;
+}
+
+/**
+ * xemaclite_recv_data - Receive a frame
+ * @drvdata: Pointer to the Emaclite device private data
+ * @data: Address where the data is to be received
+ *
+ * This function is intended to be called from the interrupt context or
+ * with a wrapper which waits for the receive frame to be available.
+ *
+ * Return: Total number of bytes received
+ */
+static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data)
+{
+ void __iomem *addr;
+ u16 length, proto_type;
+ u32 reg_data;
+
+ /* Determine the expected buffer address */
+ addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use);
+
+ /* Verify which buffer has valid data */
+ reg_data = in_be32(addr + XEL_RSR_OFFSET);
+
+ if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
+ if (drvdata->rx_ping_pong != 0)
+ drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET;
+ } else {
+ /* The instance is out of sync, try other buffer if other
+ * buffer is configured, return 0 otherwise. If the instance is
+ * out of sync, do not update the 'next_rx_buf_to_use' since it
+ * will correct on subsequent calls */
+ if (drvdata->rx_ping_pong != 0)
+ addr = (void __iomem __force *)((u32 __force)addr ^
+ XEL_BUFFER_OFFSET);
+ else
+ return 0; /* No data was available */
+
+ /* Verify that buffer has valid data */
+ reg_data = in_be32(addr + XEL_RSR_OFFSET);
+ if ((reg_data & XEL_RSR_RECV_DONE_MASK) !=
+ XEL_RSR_RECV_DONE_MASK)
+ return 0; /* No data was available */
+ }
+
+ /* Get the protocol type of the ethernet frame that arrived */
+ proto_type = ((in_be32(addr + XEL_HEADER_OFFSET +
+ XEL_RXBUFF_OFFSET) >> XEL_HEADER_SHIFT) &
+ XEL_RPLR_LENGTH_MASK);
+
+ /* Check if received ethernet frame is a raw ethernet frame
+ * or an IP packet or an ARP packet */
+ if (proto_type > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
+
+ if (proto_type == ETH_P_IP) {
+ length = ((in_be32(addr +
+ XEL_HEADER_IP_LENGTH_OFFSET +
+ XEL_RXBUFF_OFFSET) >>
+ XEL_HEADER_SHIFT) &
+ XEL_RPLR_LENGTH_MASK);
+ length += ETH_HLEN + ETH_FCS_LEN;
+
+ } else if (proto_type == ETH_P_ARP)
+ length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN;
+ else
+ /* Field contains type other than IP or ARP, use max
+ * frame size and let user parse it */
+ length = ETH_FRAME_LEN + ETH_FCS_LEN;
+ } else
+ /* Use the length in the frame, plus the header and trailer */
+ length = proto_type + ETH_HLEN + ETH_FCS_LEN;
+
+ /* Read from the EmacLite device */
+ xemaclite_aligned_read((u32 __force *) (addr + XEL_RXBUFF_OFFSET),
+ data, length);
+
+ /* Acknowledge the frame */
+ reg_data = in_be32(addr + XEL_RSR_OFFSET);
+ reg_data &= ~XEL_RSR_RECV_DONE_MASK;
+ out_be32(addr + XEL_RSR_OFFSET, reg_data);
+
+ return length;
+}
+
+/**
+ * xemaclite_set_mac_address - Set the MAC address for this device
+ * @drvdata: Pointer to the Emaclite device private data
+ * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value)
+ *
+ * Tx must be idle and Rx should be idle for deterministic results.
+ * It is recommended that this function should be called after the
+ * initialization and before transmission of any packets from the device.
+ * The MAC address can be programmed using any of the two transmit
+ * buffers (if configured).
+ */
+static void xemaclite_set_mac_address(struct net_local *drvdata,
+ u8 *address_ptr)
+{
+ void __iomem *addr;
+ u32 reg_data;
+
+ /* Determine the expected Tx buffer address */
+ addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
+
+ xemaclite_aligned_write(address_ptr, (u32 __force *) addr, ETH_ALEN);
+
+ out_be32(addr + XEL_TPLR_OFFSET, ETH_ALEN);
+
+ /* Update the MAC address in the EmacLite */
+ reg_data = in_be32(addr + XEL_TSR_OFFSET);
+ out_be32(addr + XEL_TSR_OFFSET, reg_data | XEL_TSR_PROG_MAC_ADDR);
+
+ /* Wait for EmacLite to finish with the MAC address update */
+ while ((in_be32(addr + XEL_TSR_OFFSET) &
+ XEL_TSR_PROG_MAC_ADDR) != 0)
+ ;
+}
+
+/**
+ * xemaclite_tx_timeout - Callback for Tx Timeout
+ * @dev: Pointer to the network device
+ *
+ * This function is called when Tx time out occurs for Emaclite device.
+ */
+static void xemaclite_tx_timeout(struct net_device *dev)
+{
+ struct net_local *lp = (struct net_local *) netdev_priv(dev);
+ unsigned long flags;
+
+ dev_err(&lp->ndev->dev, "Exceeded transmit timeout of %lu ms\n",
+ TX_TIMEOUT * 1000UL / HZ);
+
+ dev->stats.tx_errors++;
+
+ /* Reset the device */
+ spin_lock_irqsave(&lp->reset_lock, flags);
+
+ /* Shouldn't really be necessary, but shouldn't hurt */
+ netif_stop_queue(dev);
+
+ xemaclite_disable_interrupts(lp);
+ xemaclite_enable_interrupts(lp);
+
+ if (lp->deferred_skb) {
+ dev_kfree_skb(lp->deferred_skb);
+ lp->deferred_skb = NULL;
+ dev->stats.tx_errors++;
+ }
+
+ /* To exclude tx timeout */
+ dev->trans_start = 0xffffffff - TX_TIMEOUT - TX_TIMEOUT;
+
+ /* We're all ready to go. Start the queue */
+ netif_wake_queue(dev);
+ spin_unlock_irqrestore(&lp->reset_lock, flags);
+}
+
+/**********************/
+/* Interrupt Handlers */
+/**********************/
+
+/**
+ * xemaclite_tx_handler - Interrupt handler for frames sent
+ * @dev: Pointer to the network device
+ *
+ * This function updates the number of packets transmitted and handles the
+ * deferred skb, if there is one.
+ */
+static void xemaclite_tx_handler(struct net_device *dev)
+{
+ struct net_local *lp = (struct net_local *) netdev_priv(dev);
+
+ dev->stats.tx_packets++;
+ if (lp->deferred_skb) {
+ if (xemaclite_send_data(lp,
+ (u8 *) lp->deferred_skb->data,
+ lp->deferred_skb->len) != 0)
+ return;
+ else {
+ dev->stats.tx_bytes += lp->deferred_skb->len;
+ dev_kfree_skb_irq(lp->deferred_skb);
+ lp->deferred_skb = NULL;
+ dev->trans_start = jiffies;
+ netif_wake_queue(dev);
+ }
+ }
+}
+
+/**
+ * xemaclite_rx_handler- Interrupt handler for frames received
+ * @dev: Pointer to the network device
+ *
+ * This function allocates memory for a socket buffer, fills it with data
+ * received and hands it over to the TCP/IP stack.
+ */
+static void xemaclite_rx_handler(struct net_device *dev)
+{
+ struct net_local *lp = (struct net_local *) netdev_priv(dev);
+ struct sk_buff *skb;
+ unsigned int align;
+ u32 len;
+
+ len = ETH_FRAME_LEN + ETH_FCS_LEN;
+ skb = dev_alloc_skb(len + ALIGNMENT);
+ if (!skb) {
+ /* Couldn't get memory. */
+ dev->stats.rx_dropped++;
+ dev_err(&lp->ndev->dev, "Could not allocate receive buffer\n");
+ return;
+ }
+
+ /*
+ * A new skb should have the data halfword aligned, but this code is
+ * here just in case that isn't true. Calculate how many
+ * bytes we should reserve to get the data to start on a word
+ * boundary */
+ align = BUFFER_ALIGN(skb->data);
+ if (align)
+ skb_reserve(skb, align);
+
+ skb_reserve(skb, 2);
+
+ len = xemaclite_recv_data(lp, (u8 *) skb->data);
+
+ if (!len) {
+ dev->stats.rx_errors++;
+ dev_kfree_skb_irq(skb);
+ return;
+ }
+
+ skb_put(skb, len); /* Tell the skb how much data we got */
+ skb->dev = dev; /* Fill out required meta-data */
+
+ skb->protocol = eth_type_trans(skb, dev);
+ skb->ip_summed = CHECKSUM_NONE;
+
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += len;
+ dev->last_rx = jiffies;
+
+ netif_rx(skb); /* Send the packet upstream */
+}
+
+/**
+ * xemaclite_interrupt - Interrupt handler for this driver
+ * @irq: Irq of the Emaclite device
+ * @dev_id: Void pointer to the network device instance used as callback
+ * reference
+ *
+ * This function handles the Tx and Rx interrupts of the EmacLite device.
+ */
+static irqreturn_t xemaclite_interrupt(int irq, void *dev_id)
+{
+ bool tx_complete = 0;
+ struct net_device *dev = dev_id;
+ struct net_local *lp = (struct net_local *) netdev_priv(dev);
+ void __iomem *base_addr = lp->base_addr;
+ u32 tx_status;
+
+ /* Check if there is Rx Data available */
+ if ((in_be32(base_addr + XEL_RSR_OFFSET) & XEL_RSR_RECV_DONE_MASK) ||
+ (in_be32(base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET)
+ & XEL_RSR_RECV_DONE_MASK))
+
+ xemaclite_rx_handler(dev);
+
+ /* Check if the Transmission for the first buffer is completed */
+ tx_status = in_be32(base_addr + XEL_TSR_OFFSET);
+ if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
+ (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
+
+ tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
+ out_be32(base_addr + XEL_TSR_OFFSET, tx_status);
+
+ tx_complete = 1;
+ }
+
+ /* Check if the Transmission for the second buffer is completed */
+ tx_status = in_be32(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
+ if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
+ (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
+
+ tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
+ out_be32(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET,
+ tx_status);
+
+ tx_complete = 1;
+ }
+
+ /* If there was a Tx interrupt, call the Tx Handler */
+ if (tx_complete != 0)
+ xemaclite_tx_handler(dev);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * xemaclite_open - Open the network device
+ * @dev: Pointer to the network device
+ *
+ * This function sets the MAC address, requests an IRQ and enables interrupts
+ * for the Emaclite device and starts the Tx queue.
+ */
+static int xemaclite_open(struct net_device *dev)
+{
+ struct net_local *lp = (struct net_local *) netdev_priv(dev);
+ int retval;
+
+ /* Just to be safe, stop the device first */
+ xemaclite_disable_interrupts(lp);
+
+ /* Set the MAC address each time opened */
+ xemaclite_set_mac_address(lp, dev->dev_addr);
+
+ /* Grab the IRQ */
+ retval = request_irq(dev->irq, &xemaclite_interrupt, 0, dev->name, dev);
+ if (retval) {
+ dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n",
+ dev->irq);
+ return retval;
+ }
+
+ /* Enable Interrupts */
+ xemaclite_enable_interrupts(lp);
+
+ /* We're ready to go */
+ netif_start_queue(dev);
+
+ return 0;
+}
+
+/**
+ * xemaclite_close - Close the network device
+ * @dev: Pointer to the network device
+ *
+ * This function stops the Tx queue, disables interrupts and frees the IRQ for
+ * the Emaclite device.
+ */
+static int xemaclite_close(struct net_device *dev)
+{
+ struct net_local *lp = (struct net_local *) netdev_priv(dev);
+
+ netif_stop_queue(dev);
+ xemaclite_disable_interrupts(lp);
+ free_irq(dev->irq, dev);
+
+ return 0;
+}
+
+/**
+ * xemaclite_get_stats - Get the stats for the net_device
+ * @dev: Pointer to the network device
+ *
+ * This function returns the address of the 'net_device_stats' structure for the
+ * given network device. This structure holds usage statistics for the network
+ * device.
+ *
+ * Return: Pointer to the net_device_stats structure.
+ */
+static struct net_device_stats *xemaclite_get_stats(struct net_device *dev)
+{
+ return &dev->stats;
+}
+
+/**
+ * xemaclite_send - Transmit a frame
+ * @orig_skb: Pointer to the socket buffer to be transmitted
+ * @dev: Pointer to the network device
+ *
+ * This function checks if the Tx buffer of the Emaclite device is free to send
+ * data. If so, it fills the Tx buffer with data from socket buffer data,
+ * updates the stats and frees the socket buffer. The Tx completion is signaled
+ * by an interrupt. If the Tx buffer isn't free, then the socket buffer is
+ * deferred and the Tx queue is stopped so that the deferred socket buffer can
+ * be transmitted when the Emaclite device is free to transmit data.
+ *
+ * Return: 0, always.
+ */
+static int xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev)
+{
+ struct net_local *lp = (struct net_local *) netdev_priv(dev);
+ struct sk_buff *new_skb;
+ unsigned int len;
+ unsigned long flags;
+
+ len = orig_skb->len;
+
+ new_skb = orig_skb;
+
+ spin_lock_irqsave(&lp->reset_lock, flags);
+ if (xemaclite_send_data(lp, (u8 *) new_skb->data, len) != 0) {
+ /* If the Emaclite Tx buffer is busy, stop the Tx queue and
+ * defer the skb for transmission at a later point when the
+ * current transmission is complete */
+ netif_stop_queue(dev);
+ lp->deferred_skb = new_skb;
+ spin_unlock_irqrestore(&lp->reset_lock, flags);
+ return 0;
+ }
+ spin_unlock_irqrestore(&lp->reset_lock, flags);
+
+ dev->stats.tx_bytes += len;
+ dev_kfree_skb(new_skb);
+ dev->trans_start = jiffies;
+
+ return 0;
+}
+
+/**
+ * xemaclite_ioctl - Perform IO Control operations on the network device
+ * @dev: Pointer to the network device
+ * @rq: Pointer to the interface request structure
+ * @cmd: IOCTL command
+ *
+ * The only IOCTL operation supported by this function is setting the MAC
+ * address. An error is reported if any other operations are requested.
+ *
+ * Return: 0 to indicate success, or a negative error for failure.
+ */
+static int xemaclite_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+ struct net_local *lp = (struct net_local *) netdev_priv(dev);
+ struct hw_addr_data *hw_addr = (struct hw_addr_data *) &rq->ifr_hwaddr;
+
+ switch (cmd) {
+ case SIOCETHTOOL:
+ return -EIO;
+
+ case SIOCSIFHWADDR:
+ dev_err(&lp->ndev->dev, "SIOCSIFHWADDR\n");
+
+ /* Copy MAC address in from user space */
+ copy_from_user((void __force *) dev->dev_addr,
+ (void __user __force *) hw_addr,
+ IFHWADDRLEN);
+ xemaclite_set_mac_address(lp, dev->dev_addr);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+/**
+ * xemaclite_remove_ndev - Free the network device
+ * @ndev: Pointer to the network device to be freed
+ *
+ * This function un maps the IO region of the Emaclite device and frees the net
+ * device.
+ */
+static void xemaclite_remove_ndev(struct net_device *ndev)
+{
+ if (ndev) {
+ struct net_local *lp = (struct net_local *) netdev_priv(ndev);
+
+ if (lp->base_addr)
+ iounmap((void __iomem __force *) (lp->base_addr));
+ free_netdev(ndev);
+ }
+}
+
+/**
+ * get_bool - Get a parameter from the OF device
+ * @ofdev: Pointer to OF device structure
+ * @s: Property to be retrieved
+ *
+ * This function looks for a property in the device node and returns the value
+ * of the property if its found or 0 if the property is not found.
+ *
+ * Return: Value of the parameter if the parameter is found, or 0 otherwise
+ */
+static bool get_bool(struct of_device *ofdev, const char *s)
+{
+ u32 *p = (u32 *)of_get_property(ofdev->node, s, NULL);
+
+ if (p) {
+ return (bool)*p;
+ } else {
+ dev_warn(&ofdev->dev, "Parameter %s not found,"
+ "defaulting to false\n", s);
+ return 0;
+ }
+}
+
+static struct net_device_ops xemaclite_netdev_ops;
+
+/**
+ * xemaclite_of_probe - Probe method for the Emaclite device.
+ * @ofdev: Pointer to OF device structure
+ * @match: Pointer to the structure used for matching a device
+ *
+ * This function probes for the Emaclite device in the device tree.
+ * It initializes the driver data structure and the hardware, sets the MAC
+ * address and registers the network device.
+ *
+ * Return: 0, if the driver is bound to the Emaclite device, or
+ * a negative error if there is failure.
+ */
+static int __devinit xemaclite_of_probe(struct of_device *ofdev,
+ const struct of_device_id *match)
+{
+ struct resource r_irq; /* Interrupt resources */
+ struct resource r_mem; /* IO mem resources */
+ struct net_device *ndev = NULL;
+ struct net_local *lp = NULL;
+ struct device *dev = &ofdev->dev;
+ const void *mac_address;
+
+ int rc = 0;
+
+ dev_info(dev, "Device Tree Probing\n");
+
+ /* Get iospace for the device */
+ rc = of_address_to_resource(ofdev->node, 0, &r_mem);
+ if (rc) {
+ dev_err(dev, "invalid address\n");
+ return rc;
+ }
+
+ /* Get IRQ for the device */
+ rc = of_irq_to_resource(ofdev->node, 0, &r_irq);
+ if (rc == NO_IRQ) {
+ dev_err(dev, "no IRQ found\n");
+ return rc;
+ }
+
+ /* Create an ethernet device instance */
+ ndev = alloc_etherdev(sizeof(struct net_local));
+ if (!ndev) {
+ dev_err(dev, "Could not allocate network device\n");
+ return -ENOMEM;
+ }
+
+ dev_set_drvdata(dev, ndev);
+
+ ndev->irq = r_irq.start;
+ ndev->mem_start = r_mem.start;
+ ndev->mem_end = r_mem.end;
+
+ lp = netdev_priv(ndev);
+ lp->ndev = ndev;
+
+ if (!request_mem_region(ndev->mem_start,
+ ndev->mem_end - ndev->mem_start + 1,
+ DRIVER_NAME)) {
+ dev_err(dev, "Couldn't lock memory region at %p\n",
+ (void *)ndev->mem_start);
+ rc = -EBUSY;
+ goto error2;
+ }
+
+ /* Get the virtual base address for the device */
+ lp->base_addr = ioremap(r_mem.start, r_mem.end - r_mem.start + 1);
+ if (NULL == lp->base_addr) {
+ dev_err(dev, "EmacLite: Could not allocate iomem\n");
+ rc = -EIO;
+ goto error1;
+ }
+
+ spin_lock_init(&lp->reset_lock);
+ lp->next_tx_buf_to_use = 0x0;
+ lp->next_rx_buf_to_use = 0x0;
+ lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong");
+ lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong");
+ mac_address = of_get_mac_address(ofdev->node);
+
+ if (mac_address)
+ /* Set the MAC address. */
+ memcpy(ndev->dev_addr, mac_address, 6);
+ else
+ dev_warn(dev, "No MAC address found\n");
+
+ /* Clear the Tx CSR's in case this is a restart */
+ out_be32(lp->base_addr + XEL_TSR_OFFSET, 0);
+ out_be32(lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, 0);
+
+ /* Set the MAC address in the EmacLite device */
+ xemaclite_set_mac_address(lp, ndev->dev_addr);
+
+ dev_info(dev,
+ "MAC address is now %2x:%2x:%2x:%2x:%2x:%2x\n",
+ ndev->dev_addr[0], ndev->dev_addr[1],
+ ndev->dev_addr[2], ndev->dev_addr[3],
+ ndev->dev_addr[4], ndev->dev_addr[5]);
+
+ ndev->netdev_ops = &xemaclite_netdev_ops;
+ ndev->flags &= ~IFF_MULTICAST;
+ ndev->watchdog_timeo = TX_TIMEOUT;
+
+ /* Finally, register the device */
+ rc = register_netdev(ndev);
+ if (rc) {
+ dev_err(dev,
+ "Cannot register network device, aborting\n");
+ goto error1;
+ }
+
+ dev_info(dev,
+ "Xilinx EmacLite at 0x%08X mapped to 0x%08X, irq=%d\n",
+ (unsigned int __force)ndev->mem_start,
+ (unsigned int __force)lp->base_addr, ndev->irq);
+ return 0;
+
+error1:
+ release_mem_region(ndev->mem_start, r_mem.end - r_mem.start + 1);
+
+error2:
+ xemaclite_remove_ndev(ndev);
+ return rc;
+}
+
+/**
+ * xemaclite_of_remove - Unbind the driver from the Emaclite device.
+ * @of_dev: Pointer to OF device structure
+ *
+ * This function is called if a device is physically removed from the system or
+ * if the driver module is being unloaded. It frees any resources allocated to
+ * the device.
+ *
+ * Return: 0, always.
+ */
+static int __devexit xemaclite_of_remove(struct of_device *of_dev)
+{
+ struct device *dev = &of_dev->dev;
+ struct net_device *ndev = dev_get_drvdata(dev);
+
+ unregister_netdev(ndev);
+
+ release_mem_region(ndev->mem_start, ndev->mem_end-ndev->mem_start + 1);
+
+ xemaclite_remove_ndev(ndev);
+
+ dev_set_drvdata(dev, NULL);
+
+ return 0;
+}
+
+static struct net_device_ops xemaclite_netdev_ops = {
+ .ndo_open = xemaclite_open,
+ .ndo_stop = xemaclite_close,
+ .ndo_start_xmit = xemaclite_send,
+ .ndo_do_ioctl = xemaclite_ioctl,
+ .ndo_tx_timeout = xemaclite_tx_timeout,
+ .ndo_get_stats = xemaclite_get_stats,
+};
+
+/* Match table for OF platform binding */
+static struct of_device_id xemaclite_of_match[] __devinitdata = {
+ { .compatible = "xlnx,opb-ethernetlite-1.01.a", },
+ { .compatible = "xlnx,opb-ethernetlite-1.01.b", },
+ { .compatible = "xlnx,xps-ethernetlite-1.00.a", },
+ { .compatible = "xlnx,xps-ethernetlite-2.00.a", },
+ { .compatible = "xlnx,xps-ethernetlite-2.01.a", },
+ { /* end of list */ },
+};
+MODULE_DEVICE_TABLE(of, xemaclite_of_match);
+
+static struct of_platform_driver xemaclite_of_driver = {
+ .name = DRIVER_NAME,
+ .match_table = xemaclite_of_match,
+ .probe = xemaclite_of_probe,
+ .remove = __devexit_p(xemaclite_of_remove),
+};
+
+/**
+ * xgpiopss_init - Initial driver registration call
+ *
+ * Return: 0 upon success, or a negative error upon failure.
+ */
+static int __init xemaclite_init(void)
+{
+ /* No kernel boot options used, we just need to register the driver */
+ return of_register_platform_driver(&xemaclite_of_driver);
+}
+
+/**
+ * xemaclite_cleanup - Driver un-registration call
+ */
+static void __exit xemaclite_cleanup(void)
+{
+ of_unregister_platform_driver(&xemaclite_of_driver);
+}
+
+module_init(xemaclite_init);
+module_exit(xemaclite_cleanup);
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver");
+MODULE_LICENSE("GPL");
git.openpandora.org / pandora-kernel.git / commitdiff