2 * Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device.
4 * This is a new flat driver which is based on the original emac_lite
5 * driver from John Williams <john.williams@petalogix.com>.
7 * 2007-2009 (c) Xilinx, Inc.
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
15 #include <linux/module.h>
16 #include <linux/uaccess.h>
17 #include <linux/init.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/skbuff.h>
22 #include <linux/slab.h>
23 #include <linux/of_address.h>
24 #include <linux/of_device.h>
25 #include <linux/of_platform.h>
26 #include <linux/of_mdio.h>
27 #include <linux/phy.h>
29 #define DRIVER_NAME "xilinx_emaclite"
31 /* Register offsets for the EmacLite Core */
32 #define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */
33 #define XEL_MDIOADDR_OFFSET 0x07E4 /* MDIO Address Register */
34 #define XEL_MDIOWR_OFFSET 0x07E8 /* MDIO Write Data Register */
35 #define XEL_MDIORD_OFFSET 0x07EC /* MDIO Read Data Register */
36 #define XEL_MDIOCTRL_OFFSET 0x07F0 /* MDIO Control Register */
37 #define XEL_GIER_OFFSET 0x07F8 /* GIE Register */
38 #define XEL_TSR_OFFSET 0x07FC /* Tx status */
39 #define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */
41 #define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */
42 #define XEL_RPLR_OFFSET 0x100C /* Rx packet length */
43 #define XEL_RSR_OFFSET 0x17FC /* Rx status */
45 #define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */
47 /* MDIO Address Register Bit Masks */
48 #define XEL_MDIOADDR_REGADR_MASK 0x0000001F /* Register Address */
49 #define XEL_MDIOADDR_PHYADR_MASK 0x000003E0 /* PHY Address */
50 #define XEL_MDIOADDR_PHYADR_SHIFT 5
51 #define XEL_MDIOADDR_OP_MASK 0x00000400 /* RD/WR Operation */
53 /* MDIO Write Data Register Bit Masks */
54 #define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */
56 /* MDIO Read Data Register Bit Masks */
57 #define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */
59 /* MDIO Control Register Bit Masks */
60 #define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001 /* MDIO Status Mask */
61 #define XEL_MDIOCTRL_MDIOEN_MASK 0x00000008 /* MDIO Enable */
63 /* Global Interrupt Enable Register (GIER) Bit Masks */
64 #define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */
66 /* Transmit Status Register (TSR) Bit Masks */
67 #define XEL_TSR_XMIT_BUSY_MASK 0x00000001 /* Tx complete */
68 #define XEL_TSR_PROGRAM_MASK 0x00000002 /* Program the MAC address */
69 #define XEL_TSR_XMIT_IE_MASK 0x00000008 /* Tx interrupt enable bit */
70 #define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000 /* Buffer is active, SW bit
71 * only. This is not documented
74 /* Define for programming the MAC address into the EmacLite */
75 #define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)
77 /* Receive Status Register (RSR) */
78 #define XEL_RSR_RECV_DONE_MASK 0x00000001 /* Rx complete */
79 #define XEL_RSR_RECV_IE_MASK 0x00000008 /* Rx interrupt enable bit */
81 /* Transmit Packet Length Register (TPLR) */
82 #define XEL_TPLR_LENGTH_MASK 0x0000FFFF /* Tx packet length */
84 /* Receive Packet Length Register (RPLR) */
85 #define XEL_RPLR_LENGTH_MASK 0x0000FFFF /* Rx packet length */
87 #define XEL_HEADER_OFFSET 12 /* Offset to length field */
88 #define XEL_HEADER_SHIFT 16 /* Shift value for length */
90 /* General Ethernet Definitions */
91 #define XEL_ARP_PACKET_SIZE 28 /* Max ARP packet size */
92 #define XEL_HEADER_IP_LENGTH_OFFSET 16 /* IP Length Offset */
96 #define TX_TIMEOUT (60*HZ) /* Tx timeout is 60 seconds. */
99 /* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */
100 #define BUFFER_ALIGN(adr) ((ALIGNMENT - ((u32) adr)) % ALIGNMENT)
103 * struct net_local - Our private per device data
104 * @ndev: instance of the network device
105 * @tx_ping_pong: indicates whether Tx Pong buffer is configured in HW
106 * @rx_ping_pong: indicates whether Rx Pong buffer is configured in HW
107 * @next_tx_buf_to_use: next Tx buffer to write to
108 * @next_rx_buf_to_use: next Rx buffer to read from
109 * @base_addr: base address of the Emaclite device
110 * @reset_lock: lock used for synchronization
111 * @deferred_skb: holds an skb (for transmission at a later time) when the
112 * Tx buffer is not free
113 * @phy_dev: pointer to the PHY device
114 * @phy_node: pointer to the PHY device node
115 * @mii_bus: pointer to the MII bus
116 * @mdio_irqs: IRQs table for MDIO bus
117 * @last_link: last link status
118 * @has_mdio: indicates whether MDIO is included in the HW
122 struct net_device *ndev;
126 u32 next_tx_buf_to_use;
127 u32 next_rx_buf_to_use;
128 void __iomem *base_addr;
130 spinlock_t reset_lock;
131 struct sk_buff *deferred_skb;
133 struct phy_device *phy_dev;
134 struct device_node *phy_node;
136 struct mii_bus *mii_bus;
137 int mdio_irqs[PHY_MAX_ADDR];
144 /*************************/
145 /* EmacLite driver calls */
146 /*************************/
149 * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device
150 * @drvdata: Pointer to the Emaclite device private data
152 * This function enables the Tx and Rx interrupts for the Emaclite device along
153 * with the Global Interrupt Enable.
155 static void xemaclite_enable_interrupts(struct net_local *drvdata)
159 /* Enable the Tx interrupts for the first Buffer */
160 reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET);
161 out_be32(drvdata->base_addr + XEL_TSR_OFFSET,
162 reg_data | XEL_TSR_XMIT_IE_MASK);
164 /* Enable the Tx interrupts for the second Buffer if
165 * configured in HW */
166 if (drvdata->tx_ping_pong != 0) {
167 reg_data = in_be32(drvdata->base_addr +
168 XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
169 out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
171 reg_data | XEL_TSR_XMIT_IE_MASK);
174 /* Enable the Rx interrupts for the first buffer */
175 out_be32(drvdata->base_addr + XEL_RSR_OFFSET,
176 XEL_RSR_RECV_IE_MASK);
178 /* Enable the Rx interrupts for the second Buffer if
179 * configured in HW */
180 if (drvdata->rx_ping_pong != 0) {
181 out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
183 XEL_RSR_RECV_IE_MASK);
186 /* Enable the Global Interrupt Enable */
187 out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK);
191 * xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device
192 * @drvdata: Pointer to the Emaclite device private data
194 * This function disables the Tx and Rx interrupts for the Emaclite device,
195 * along with the Global Interrupt Enable.
197 static void xemaclite_disable_interrupts(struct net_local *drvdata)
201 /* Disable the Global Interrupt Enable */
202 out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK);
204 /* Disable the Tx interrupts for the first buffer */
205 reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET);
206 out_be32(drvdata->base_addr + XEL_TSR_OFFSET,
207 reg_data & (~XEL_TSR_XMIT_IE_MASK));
209 /* Disable the Tx interrupts for the second Buffer
210 * if configured in HW */
211 if (drvdata->tx_ping_pong != 0) {
212 reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
214 out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
216 reg_data & (~XEL_TSR_XMIT_IE_MASK));
219 /* Disable the Rx interrupts for the first buffer */
220 reg_data = in_be32(drvdata->base_addr + XEL_RSR_OFFSET);
221 out_be32(drvdata->base_addr + XEL_RSR_OFFSET,
222 reg_data & (~XEL_RSR_RECV_IE_MASK));
224 /* Disable the Rx interrupts for the second buffer
225 * if configured in HW */
226 if (drvdata->rx_ping_pong != 0) {
228 reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
230 out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET +
232 reg_data & (~XEL_RSR_RECV_IE_MASK));
237 * xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address
238 * @src_ptr: Void pointer to the 16-bit aligned source address
239 * @dest_ptr: Pointer to the 32-bit aligned destination address
240 * @length: Number bytes to write from source to destination
242 * This function writes data from a 16-bit aligned buffer to a 32-bit aligned
243 * address in the EmacLite device.
245 static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr,
250 u16 *from_u16_ptr, *to_u16_ptr;
252 to_u32_ptr = dest_ptr;
253 from_u16_ptr = (u16 *) src_ptr;
256 for (; length > 3; length -= 4) {
257 to_u16_ptr = (u16 *) ((void *) &align_buffer);
258 *to_u16_ptr++ = *from_u16_ptr++;
259 *to_u16_ptr++ = *from_u16_ptr++;
262 *to_u32_ptr++ = align_buffer;
265 u8 *from_u8_ptr, *to_u8_ptr;
267 /* Set up to output the remaining data */
269 to_u8_ptr = (u8 *) &align_buffer;
270 from_u8_ptr = (u8 *) from_u16_ptr;
272 /* Output the remaining data */
273 for (; length > 0; length--)
274 *to_u8_ptr++ = *from_u8_ptr++;
276 *to_u32_ptr = align_buffer;
281 * xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer
282 * @src_ptr: Pointer to the 32-bit aligned source address
283 * @dest_ptr: Pointer to the 16-bit aligned destination address
284 * @length: Number bytes to read from source to destination
286 * This function reads data from a 32-bit aligned address in the EmacLite device
287 * to a 16-bit aligned buffer.
289 static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr,
292 u16 *to_u16_ptr, *from_u16_ptr;
296 from_u32_ptr = src_ptr;
297 to_u16_ptr = (u16 *) dest_ptr;
299 for (; length > 3; length -= 4) {
300 /* Copy each word into the temporary buffer */
301 align_buffer = *from_u32_ptr++;
302 from_u16_ptr = (u16 *)&align_buffer;
304 /* Read data from source */
305 *to_u16_ptr++ = *from_u16_ptr++;
306 *to_u16_ptr++ = *from_u16_ptr++;
310 u8 *to_u8_ptr, *from_u8_ptr;
312 /* Set up to read the remaining data */
313 to_u8_ptr = (u8 *) to_u16_ptr;
314 align_buffer = *from_u32_ptr++;
315 from_u8_ptr = (u8 *) &align_buffer;
317 /* Read the remaining data */
318 for (; length > 0; length--)
319 *to_u8_ptr = *from_u8_ptr;
324 * xemaclite_send_data - Send an Ethernet frame
325 * @drvdata: Pointer to the Emaclite device private data
326 * @data: Pointer to the data to be sent
327 * @byte_count: Total frame size, including header
329 * This function checks if the Tx buffer of the Emaclite device is free to send
330 * data. If so, it fills the Tx buffer with data for transmission. Otherwise, it
333 * Return: 0 upon success or -1 if the buffer(s) are full.
335 * Note: The maximum Tx packet size can not be more than Ethernet header
336 * (14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS.
338 static int xemaclite_send_data(struct net_local *drvdata, u8 *data,
339 unsigned int byte_count)
344 /* Determine the expected Tx buffer address */
345 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
347 /* If the length is too large, truncate it */
348 if (byte_count > ETH_FRAME_LEN)
349 byte_count = ETH_FRAME_LEN;
351 /* Check if the expected buffer is available */
352 reg_data = in_be32(addr + XEL_TSR_OFFSET);
353 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
354 XEL_TSR_XMIT_ACTIVE_MASK)) == 0) {
356 /* Switch to next buffer if configured */
357 if (drvdata->tx_ping_pong != 0)
358 drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET;
359 } else if (drvdata->tx_ping_pong != 0) {
360 /* If the expected buffer is full, try the other buffer,
361 * if it is configured in HW */
363 addr = (void __iomem __force *)((u32 __force)addr ^
365 reg_data = in_be32(addr + XEL_TSR_OFFSET);
367 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
368 XEL_TSR_XMIT_ACTIVE_MASK)) != 0)
369 return -1; /* Buffers were full, return failure */
371 return -1; /* Buffer was full, return failure */
373 /* Write the frame to the buffer */
374 xemaclite_aligned_write(data, (u32 __force *) addr, byte_count);
376 out_be32(addr + XEL_TPLR_OFFSET, (byte_count & XEL_TPLR_LENGTH_MASK));
378 /* Update the Tx Status Register to indicate that there is a
379 * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which
380 * is used by the interrupt handler to check whether a frame
381 * has been transmitted */
382 reg_data = in_be32(addr + XEL_TSR_OFFSET);
383 reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK);
384 out_be32(addr + XEL_TSR_OFFSET, reg_data);
390 * xemaclite_recv_data - Receive a frame
391 * @drvdata: Pointer to the Emaclite device private data
392 * @data: Address where the data is to be received
394 * This function is intended to be called from the interrupt context or
395 * with a wrapper which waits for the receive frame to be available.
397 * Return: Total number of bytes received
399 static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data)
402 u16 length, proto_type;
405 /* Determine the expected buffer address */
406 addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use);
408 /* Verify which buffer has valid data */
409 reg_data = in_be32(addr + XEL_RSR_OFFSET);
411 if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
412 if (drvdata->rx_ping_pong != 0)
413 drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET;
415 /* The instance is out of sync, try other buffer if other
416 * buffer is configured, return 0 otherwise. If the instance is
417 * out of sync, do not update the 'next_rx_buf_to_use' since it
418 * will correct on subsequent calls */
419 if (drvdata->rx_ping_pong != 0)
420 addr = (void __iomem __force *)((u32 __force)addr ^
423 return 0; /* No data was available */
425 /* Verify that buffer has valid data */
426 reg_data = in_be32(addr + XEL_RSR_OFFSET);
427 if ((reg_data & XEL_RSR_RECV_DONE_MASK) !=
428 XEL_RSR_RECV_DONE_MASK)
429 return 0; /* No data was available */
432 /* Get the protocol type of the ethernet frame that arrived */
433 proto_type = ((in_be32(addr + XEL_HEADER_OFFSET +
434 XEL_RXBUFF_OFFSET) >> XEL_HEADER_SHIFT) &
435 XEL_RPLR_LENGTH_MASK);
437 /* Check if received ethernet frame is a raw ethernet frame
438 * or an IP packet or an ARP packet */
439 if (proto_type > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
441 if (proto_type == ETH_P_IP) {
442 length = ((in_be32(addr +
443 XEL_HEADER_IP_LENGTH_OFFSET +
444 XEL_RXBUFF_OFFSET) >>
446 XEL_RPLR_LENGTH_MASK);
447 length += ETH_HLEN + ETH_FCS_LEN;
449 } else if (proto_type == ETH_P_ARP)
450 length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN;
452 /* Field contains type other than IP or ARP, use max
453 * frame size and let user parse it */
454 length = ETH_FRAME_LEN + ETH_FCS_LEN;
456 /* Use the length in the frame, plus the header and trailer */
457 length = proto_type + ETH_HLEN + ETH_FCS_LEN;
459 /* Read from the EmacLite device */
460 xemaclite_aligned_read((u32 __force *) (addr + XEL_RXBUFF_OFFSET),
463 /* Acknowledge the frame */
464 reg_data = in_be32(addr + XEL_RSR_OFFSET);
465 reg_data &= ~XEL_RSR_RECV_DONE_MASK;
466 out_be32(addr + XEL_RSR_OFFSET, reg_data);
472 * xemaclite_update_address - Update the MAC address in the device
473 * @drvdata: Pointer to the Emaclite device private data
474 * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value)
476 * Tx must be idle and Rx should be idle for deterministic results.
477 * It is recommended that this function should be called after the
478 * initialization and before transmission of any packets from the device.
479 * The MAC address can be programmed using any of the two transmit
480 * buffers (if configured).
482 static void xemaclite_update_address(struct net_local *drvdata,
488 /* Determine the expected Tx buffer address */
489 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
491 xemaclite_aligned_write(address_ptr, (u32 __force *) addr, ETH_ALEN);
493 out_be32(addr + XEL_TPLR_OFFSET, ETH_ALEN);
495 /* Update the MAC address in the EmacLite */
496 reg_data = in_be32(addr + XEL_TSR_OFFSET);
497 out_be32(addr + XEL_TSR_OFFSET, reg_data | XEL_TSR_PROG_MAC_ADDR);
499 /* Wait for EmacLite to finish with the MAC address update */
500 while ((in_be32(addr + XEL_TSR_OFFSET) &
501 XEL_TSR_PROG_MAC_ADDR) != 0)
506 * xemaclite_set_mac_address - Set the MAC address for this device
507 * @dev: Pointer to the network device instance
508 * @addr: Void pointer to the sockaddr structure
510 * This function copies the HW address from the sockaddr strucutre to the
511 * net_device structure and updates the address in HW.
513 * Return: Error if the net device is busy or 0 if the addr is set
516 static int xemaclite_set_mac_address(struct net_device *dev, void *address)
518 struct net_local *lp = (struct net_local *) netdev_priv(dev);
519 struct sockaddr *addr = address;
521 if (netif_running(dev))
524 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
525 xemaclite_update_address(lp, dev->dev_addr);
530 * xemaclite_tx_timeout - Callback for Tx Timeout
531 * @dev: Pointer to the network device
533 * This function is called when Tx time out occurs for Emaclite device.
535 static void xemaclite_tx_timeout(struct net_device *dev)
537 struct net_local *lp = (struct net_local *) netdev_priv(dev);
540 dev_err(&lp->ndev->dev, "Exceeded transmit timeout of %lu ms\n",
541 TX_TIMEOUT * 1000UL / HZ);
543 dev->stats.tx_errors++;
545 /* Reset the device */
546 spin_lock_irqsave(&lp->reset_lock, flags);
548 /* Shouldn't really be necessary, but shouldn't hurt */
549 netif_stop_queue(dev);
551 xemaclite_disable_interrupts(lp);
552 xemaclite_enable_interrupts(lp);
554 if (lp->deferred_skb) {
555 dev_kfree_skb(lp->deferred_skb);
556 lp->deferred_skb = NULL;
557 dev->stats.tx_errors++;
560 /* To exclude tx timeout */
561 dev->trans_start = jiffies; /* prevent tx timeout */
563 /* We're all ready to go. Start the queue */
564 netif_wake_queue(dev);
565 spin_unlock_irqrestore(&lp->reset_lock, flags);
568 /**********************/
569 /* Interrupt Handlers */
570 /**********************/
573 * xemaclite_tx_handler - Interrupt handler for frames sent
574 * @dev: Pointer to the network device
576 * This function updates the number of packets transmitted and handles the
577 * deferred skb, if there is one.
579 static void xemaclite_tx_handler(struct net_device *dev)
581 struct net_local *lp = (struct net_local *) netdev_priv(dev);
583 dev->stats.tx_packets++;
584 if (lp->deferred_skb) {
585 if (xemaclite_send_data(lp,
586 (u8 *) lp->deferred_skb->data,
587 lp->deferred_skb->len) != 0)
590 dev->stats.tx_bytes += lp->deferred_skb->len;
591 dev_kfree_skb_irq(lp->deferred_skb);
592 lp->deferred_skb = NULL;
593 dev->trans_start = jiffies; /* prevent tx timeout */
594 netif_wake_queue(dev);
600 * xemaclite_rx_handler- Interrupt handler for frames received
601 * @dev: Pointer to the network device
603 * This function allocates memory for a socket buffer, fills it with data
604 * received and hands it over to the TCP/IP stack.
606 static void xemaclite_rx_handler(struct net_device *dev)
608 struct net_local *lp = (struct net_local *) netdev_priv(dev);
613 len = ETH_FRAME_LEN + ETH_FCS_LEN;
614 skb = dev_alloc_skb(len + ALIGNMENT);
616 /* Couldn't get memory. */
617 dev->stats.rx_dropped++;
618 dev_err(&lp->ndev->dev, "Could not allocate receive buffer\n");
623 * A new skb should have the data halfword aligned, but this code is
624 * here just in case that isn't true. Calculate how many
625 * bytes we should reserve to get the data to start on a word
627 align = BUFFER_ALIGN(skb->data);
629 skb_reserve(skb, align);
633 len = xemaclite_recv_data(lp, (u8 *) skb->data);
636 dev->stats.rx_errors++;
637 dev_kfree_skb_irq(skb);
641 skb_put(skb, len); /* Tell the skb how much data we got */
643 skb->protocol = eth_type_trans(skb, dev);
644 skb->ip_summed = CHECKSUM_NONE;
646 dev->stats.rx_packets++;
647 dev->stats.rx_bytes += len;
649 netif_rx(skb); /* Send the packet upstream */
653 * xemaclite_interrupt - Interrupt handler for this driver
654 * @irq: Irq of the Emaclite device
655 * @dev_id: Void pointer to the network device instance used as callback
658 * This function handles the Tx and Rx interrupts of the EmacLite device.
660 static irqreturn_t xemaclite_interrupt(int irq, void *dev_id)
662 bool tx_complete = 0;
663 struct net_device *dev = dev_id;
664 struct net_local *lp = (struct net_local *) netdev_priv(dev);
665 void __iomem *base_addr = lp->base_addr;
668 /* Check if there is Rx Data available */
669 if ((in_be32(base_addr + XEL_RSR_OFFSET) & XEL_RSR_RECV_DONE_MASK) ||
670 (in_be32(base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET)
671 & XEL_RSR_RECV_DONE_MASK))
673 xemaclite_rx_handler(dev);
675 /* Check if the Transmission for the first buffer is completed */
676 tx_status = in_be32(base_addr + XEL_TSR_OFFSET);
677 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
678 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
680 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
681 out_be32(base_addr + XEL_TSR_OFFSET, tx_status);
686 /* Check if the Transmission for the second buffer is completed */
687 tx_status = in_be32(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
688 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
689 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
691 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
692 out_be32(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET,
698 /* If there was a Tx interrupt, call the Tx Handler */
699 if (tx_complete != 0)
700 xemaclite_tx_handler(dev);
705 /**********************/
706 /* MDIO Bus functions */
707 /**********************/
710 * xemaclite_mdio_wait - Wait for the MDIO to be ready to use
711 * @lp: Pointer to the Emaclite device private data
713 * This function waits till the device is ready to accept a new MDIO
716 * Return: 0 for success or ETIMEDOUT for a timeout
719 static int xemaclite_mdio_wait(struct net_local *lp)
721 long end = jiffies + 2;
723 /* wait for the MDIO interface to not be busy or timeout
726 while (in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET) &
727 XEL_MDIOCTRL_MDIOSTS_MASK) {
728 if (end - jiffies <= 0) {
738 * xemaclite_mdio_read - Read from a given MII management register
739 * @bus: the mii_bus struct
740 * @phy_id: the phy address
741 * @reg: register number to read from
743 * This function waits till the device is ready to accept a new MDIO
744 * request and then writes the phy address to the MDIO Address register
745 * and reads data from MDIO Read Data register, when its available.
747 * Return: Value read from the MII management register
749 static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg)
751 struct net_local *lp = bus->priv;
755 if (xemaclite_mdio_wait(lp))
758 /* Write the PHY address, register number and set the OP bit in the
759 * MDIO Address register. Set the Status bit in the MDIO Control
760 * register to start a MDIO read transaction.
762 ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET);
763 out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET,
764 XEL_MDIOADDR_OP_MASK |
765 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg));
766 out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET,
767 ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK);
769 if (xemaclite_mdio_wait(lp))
772 rc = in_be32(lp->base_addr + XEL_MDIORD_OFFSET);
774 dev_dbg(&lp->ndev->dev,
775 "xemaclite_mdio_read(phy_id=%i, reg=%x) == %x\n",
782 * xemaclite_mdio_write - Write to a given MII management register
783 * @bus: the mii_bus struct
784 * @phy_id: the phy address
785 * @reg: register number to write to
786 * @val: value to write to the register number specified by reg
788 * This fucntion waits till the device is ready to accept a new MDIO
789 * request and then writes the val to the MDIO Write Data register.
791 static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg,
794 struct net_local *lp = bus->priv;
797 dev_dbg(&lp->ndev->dev,
798 "xemaclite_mdio_write(phy_id=%i, reg=%x, val=%x)\n",
801 if (xemaclite_mdio_wait(lp))
804 /* Write the PHY address, register number and clear the OP bit in the
805 * MDIO Address register and then write the value into the MDIO Write
806 * Data register. Finally, set the Status bit in the MDIO Control
807 * register to start a MDIO write transaction.
809 ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET);
810 out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET,
811 ~XEL_MDIOADDR_OP_MASK &
812 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg));
813 out_be32(lp->base_addr + XEL_MDIOWR_OFFSET, val);
814 out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET,
815 ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK);
821 * xemaclite_mdio_reset - Reset the mdio bus.
822 * @bus: Pointer to the MII bus
824 * This function is required(?) as per Documentation/networking/phy.txt.
825 * There is no reset in this device; this function always returns 0.
827 static int xemaclite_mdio_reset(struct mii_bus *bus)
833 * xemaclite_mdio_setup - Register mii_bus for the Emaclite device
834 * @lp: Pointer to the Emaclite device private data
835 * @ofdev: Pointer to OF device structure
837 * This function enables MDIO bus in the Emaclite device and registers a
840 * Return: 0 upon success or a negative error upon failure
842 static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev)
847 struct device_node *np = of_get_parent(lp->phy_node);
849 /* Don't register the MDIO bus if the phy_node or its parent node
855 /* Enable the MDIO bus by asserting the enable bit in MDIO Control
858 out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET,
859 XEL_MDIOCTRL_MDIOEN_MASK);
861 bus = mdiobus_alloc();
865 of_address_to_resource(np, 0, &res);
866 snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
867 (unsigned long long)res.start);
869 bus->name = "Xilinx Emaclite MDIO";
870 bus->read = xemaclite_mdio_read;
871 bus->write = xemaclite_mdio_write;
872 bus->reset = xemaclite_mdio_reset;
874 bus->irq = lp->mdio_irqs; /* preallocated IRQ table */
878 rc = of_mdiobus_register(bus, np);
890 * xemaclite_adjust_link - Link state callback for the Emaclite device
891 * @ndev: pointer to net_device struct
893 * There's nothing in the Emaclite device to be configured when the link
894 * state changes. We just print the status.
896 void xemaclite_adjust_link(struct net_device *ndev)
898 struct net_local *lp = netdev_priv(ndev);
899 struct phy_device *phy = lp->phy_dev;
902 /* hash together the state values to decide if something has changed */
903 link_state = phy->speed | (phy->duplex << 1) | phy->link;
905 if (lp->last_link != link_state) {
906 lp->last_link = link_state;
907 phy_print_status(phy);
912 * xemaclite_open - Open the network device
913 * @dev: Pointer to the network device
915 * This function sets the MAC address, requests an IRQ and enables interrupts
916 * for the Emaclite device and starts the Tx queue.
917 * It also connects to the phy device, if MDIO is included in Emaclite device.
919 static int xemaclite_open(struct net_device *dev)
921 struct net_local *lp = (struct net_local *) netdev_priv(dev);
924 /* Just to be safe, stop the device first */
925 xemaclite_disable_interrupts(lp);
930 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
931 xemaclite_adjust_link, 0,
932 PHY_INTERFACE_MODE_MII);
934 dev_err(&lp->ndev->dev, "of_phy_connect() failed\n");
938 /* EmacLite doesn't support giga-bit speeds */
939 lp->phy_dev->supported &= (PHY_BASIC_FEATURES);
940 lp->phy_dev->advertising = lp->phy_dev->supported;
942 /* Don't advertise 1000BASE-T Full/Half duplex speeds */
943 phy_write(lp->phy_dev, MII_CTRL1000, 0);
945 /* Advertise only 10 and 100mbps full/half duplex speeds */
946 phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL);
948 /* Restart auto negotiation */
949 bmcr = phy_read(lp->phy_dev, MII_BMCR);
950 bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
951 phy_write(lp->phy_dev, MII_BMCR, bmcr);
953 phy_start(lp->phy_dev);
956 /* Set the MAC address each time opened */
957 xemaclite_update_address(lp, dev->dev_addr);
960 retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev);
962 dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n",
965 phy_disconnect(lp->phy_dev);
971 /* Enable Interrupts */
972 xemaclite_enable_interrupts(lp);
974 /* We're ready to go */
975 netif_start_queue(dev);
981 * xemaclite_close - Close the network device
982 * @dev: Pointer to the network device
984 * This function stops the Tx queue, disables interrupts and frees the IRQ for
985 * the Emaclite device.
986 * It also disconnects the phy device associated with the Emaclite device.
988 static int xemaclite_close(struct net_device *dev)
990 struct net_local *lp = (struct net_local *) netdev_priv(dev);
992 netif_stop_queue(dev);
993 xemaclite_disable_interrupts(lp);
994 free_irq(dev->irq, dev);
997 phy_disconnect(lp->phy_dev);
1004 * xemaclite_get_stats - Get the stats for the net_device
1005 * @dev: Pointer to the network device
1007 * This function returns the address of the 'net_device_stats' structure for the
1008 * given network device. This structure holds usage statistics for the network
1011 * Return: Pointer to the net_device_stats structure.
1013 static struct net_device_stats *xemaclite_get_stats(struct net_device *dev)
1019 * xemaclite_send - Transmit a frame
1020 * @orig_skb: Pointer to the socket buffer to be transmitted
1021 * @dev: Pointer to the network device
1023 * This function checks if the Tx buffer of the Emaclite device is free to send
1024 * data. If so, it fills the Tx buffer with data from socket buffer data,
1025 * updates the stats and frees the socket buffer. The Tx completion is signaled
1026 * by an interrupt. If the Tx buffer isn't free, then the socket buffer is
1027 * deferred and the Tx queue is stopped so that the deferred socket buffer can
1028 * be transmitted when the Emaclite device is free to transmit data.
1030 * Return: 0, always.
1032 static int xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev)
1034 struct net_local *lp = (struct net_local *) netdev_priv(dev);
1035 struct sk_buff *new_skb;
1037 unsigned long flags;
1039 len = orig_skb->len;
1043 spin_lock_irqsave(&lp->reset_lock, flags);
1044 if (xemaclite_send_data(lp, (u8 *) new_skb->data, len) != 0) {
1045 /* If the Emaclite Tx buffer is busy, stop the Tx queue and
1046 * defer the skb for transmission at a later point when the
1047 * current transmission is complete */
1048 netif_stop_queue(dev);
1049 lp->deferred_skb = new_skb;
1050 spin_unlock_irqrestore(&lp->reset_lock, flags);
1053 spin_unlock_irqrestore(&lp->reset_lock, flags);
1055 dev->stats.tx_bytes += len;
1056 dev_kfree_skb(new_skb);
1062 * xemaclite_remove_ndev - Free the network device
1063 * @ndev: Pointer to the network device to be freed
1065 * This function un maps the IO region of the Emaclite device and frees the net
1068 static void xemaclite_remove_ndev(struct net_device *ndev)
1071 struct net_local *lp = (struct net_local *) netdev_priv(ndev);
1074 iounmap((void __iomem __force *) (lp->base_addr));
1080 * get_bool - Get a parameter from the OF device
1081 * @ofdev: Pointer to OF device structure
1082 * @s: Property to be retrieved
1084 * This function looks for a property in the device node and returns the value
1085 * of the property if its found or 0 if the property is not found.
1087 * Return: Value of the parameter if the parameter is found, or 0 otherwise
1089 static bool get_bool(struct platform_device *ofdev, const char *s)
1091 u32 *p = (u32 *)of_get_property(ofdev->dev.of_node, s, NULL);
1096 dev_warn(&ofdev->dev, "Parameter %s not found,"
1097 "defaulting to false\n", s);
1102 static struct net_device_ops xemaclite_netdev_ops;
1105 * xemaclite_of_probe - Probe method for the Emaclite device.
1106 * @ofdev: Pointer to OF device structure
1107 * @match: Pointer to the structure used for matching a device
1109 * This function probes for the Emaclite device in the device tree.
1110 * It initializes the driver data structure and the hardware, sets the MAC
1111 * address and registers the network device.
1112 * It also registers a mii_bus for the Emaclite device, if MDIO is included
1115 * Return: 0, if the driver is bound to the Emaclite device, or
1116 * a negative error if there is failure.
1118 static int __devinit xemaclite_of_probe(struct platform_device *ofdev,
1119 const struct of_device_id *match)
1121 struct resource r_irq; /* Interrupt resources */
1122 struct resource r_mem; /* IO mem resources */
1123 struct net_device *ndev = NULL;
1124 struct net_local *lp = NULL;
1125 struct device *dev = &ofdev->dev;
1126 const void *mac_address;
1130 dev_info(dev, "Device Tree Probing\n");
1132 /* Get iospace for the device */
1133 rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem);
1135 dev_err(dev, "invalid address\n");
1139 /* Get IRQ for the device */
1140 rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq);
1142 dev_err(dev, "no IRQ found\n");
1146 /* Create an ethernet device instance */
1147 ndev = alloc_etherdev(sizeof(struct net_local));
1149 dev_err(dev, "Could not allocate network device\n");
1153 dev_set_drvdata(dev, ndev);
1154 SET_NETDEV_DEV(ndev, &ofdev->dev);
1156 ndev->irq = r_irq.start;
1157 ndev->mem_start = r_mem.start;
1158 ndev->mem_end = r_mem.end;
1160 lp = netdev_priv(ndev);
1163 if (!request_mem_region(ndev->mem_start,
1164 ndev->mem_end - ndev->mem_start + 1,
1166 dev_err(dev, "Couldn't lock memory region at %p\n",
1167 (void *)ndev->mem_start);
1172 /* Get the virtual base address for the device */
1173 lp->base_addr = ioremap(r_mem.start, resource_size(&r_mem));
1174 if (NULL == lp->base_addr) {
1175 dev_err(dev, "EmacLite: Could not allocate iomem\n");
1180 spin_lock_init(&lp->reset_lock);
1181 lp->next_tx_buf_to_use = 0x0;
1182 lp->next_rx_buf_to_use = 0x0;
1183 lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong");
1184 lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong");
1185 mac_address = of_get_mac_address(ofdev->dev.of_node);
1188 /* Set the MAC address. */
1189 memcpy(ndev->dev_addr, mac_address, 6);
1191 dev_warn(dev, "No MAC address found\n");
1193 /* Clear the Tx CSR's in case this is a restart */
1194 out_be32(lp->base_addr + XEL_TSR_OFFSET, 0);
1195 out_be32(lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, 0);
1197 /* Set the MAC address in the EmacLite device */
1198 xemaclite_update_address(lp, ndev->dev_addr);
1200 lp->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
1201 rc = xemaclite_mdio_setup(lp, &ofdev->dev);
1203 dev_warn(&ofdev->dev, "error registering MDIO bus\n");
1205 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
1207 ndev->netdev_ops = &xemaclite_netdev_ops;
1208 ndev->flags &= ~IFF_MULTICAST;
1209 ndev->watchdog_timeo = TX_TIMEOUT;
1211 /* Finally, register the device */
1212 rc = register_netdev(ndev);
1215 "Cannot register network device, aborting\n");
1220 "Xilinx EmacLite at 0x%08X mapped to 0x%08X, irq=%d\n",
1221 (unsigned int __force)ndev->mem_start,
1222 (unsigned int __force)lp->base_addr, ndev->irq);
1226 release_mem_region(ndev->mem_start, resource_size(&r_mem));
1229 xemaclite_remove_ndev(ndev);
1234 * xemaclite_of_remove - Unbind the driver from the Emaclite device.
1235 * @of_dev: Pointer to OF device structure
1237 * This function is called if a device is physically removed from the system or
1238 * if the driver module is being unloaded. It frees any resources allocated to
1241 * Return: 0, always.
1243 static int __devexit xemaclite_of_remove(struct platform_device *of_dev)
1245 struct device *dev = &of_dev->dev;
1246 struct net_device *ndev = dev_get_drvdata(dev);
1248 struct net_local *lp = (struct net_local *) netdev_priv(ndev);
1250 /* Un-register the mii_bus, if configured */
1252 mdiobus_unregister(lp->mii_bus);
1253 kfree(lp->mii_bus->irq);
1254 mdiobus_free(lp->mii_bus);
1258 unregister_netdev(ndev);
1261 of_node_put(lp->phy_node);
1262 lp->phy_node = NULL;
1264 release_mem_region(ndev->mem_start, ndev->mem_end-ndev->mem_start + 1);
1266 xemaclite_remove_ndev(ndev);
1267 dev_set_drvdata(dev, NULL);
1272 static struct net_device_ops xemaclite_netdev_ops = {
1273 .ndo_open = xemaclite_open,
1274 .ndo_stop = xemaclite_close,
1275 .ndo_start_xmit = xemaclite_send,
1276 .ndo_set_mac_address = xemaclite_set_mac_address,
1277 .ndo_tx_timeout = xemaclite_tx_timeout,
1278 .ndo_get_stats = xemaclite_get_stats,
1281 /* Match table for OF platform binding */
1282 static struct of_device_id xemaclite_of_match[] __devinitdata = {
1283 { .compatible = "xlnx,opb-ethernetlite-1.01.a", },
1284 { .compatible = "xlnx,opb-ethernetlite-1.01.b", },
1285 { .compatible = "xlnx,xps-ethernetlite-1.00.a", },
1286 { .compatible = "xlnx,xps-ethernetlite-2.00.a", },
1287 { .compatible = "xlnx,xps-ethernetlite-2.01.a", },
1288 { .compatible = "xlnx,xps-ethernetlite-3.00.a", },
1289 { /* end of list */ },
1291 MODULE_DEVICE_TABLE(of, xemaclite_of_match);
1293 static struct of_platform_driver xemaclite_of_driver = {
1295 .name = DRIVER_NAME,
1296 .owner = THIS_MODULE,
1297 .of_match_table = xemaclite_of_match,
1299 .probe = xemaclite_of_probe,
1300 .remove = __devexit_p(xemaclite_of_remove),
1304 * xgpiopss_init - Initial driver registration call
1306 * Return: 0 upon success, or a negative error upon failure.
1308 static int __init xemaclite_init(void)
1310 /* No kernel boot options used, we just need to register the driver */
1311 return of_register_platform_driver(&xemaclite_of_driver);
1315 * xemaclite_cleanup - Driver un-registration call
1317 static void __exit xemaclite_cleanup(void)
1319 of_unregister_platform_driver(&xemaclite_of_driver);
1322 module_init(xemaclite_init);
1323 module_exit(xemaclite_cleanup);
1325 MODULE_AUTHOR("Xilinx, Inc.");
1326 MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver");
1327 MODULE_LICENSE("GPL");