1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device.
5 * This is a new flat driver which is based on the original emac_lite
8 * 2007 - 2013 (c) Xilinx, Inc.
11 #include <linux/module.h>
12 #include <linux/uaccess.h>
13 #include <linux/netdevice.h>
14 #include <linux/etherdevice.h>
15 #include <linux/skbuff.h>
16 #include <linux/ethtool.h>
18 #include <linux/slab.h>
19 #include <linux/of_address.h>
20 #include <linux/of_device.h>
21 #include <linux/of_platform.h>
22 #include <linux/of_mdio.h>
23 #include <linux/of_net.h>
24 #include <linux/phy.h>
25 #include <linux/interrupt.h>
26 #include <linux/iopoll.h>
28 #define DRIVER_NAME "xilinx_emaclite"
30 /* Register offsets for the EmacLite Core */
31 #define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */
32 #define XEL_MDIOADDR_OFFSET 0x07E4 /* MDIO Address Register */
33 #define XEL_MDIOWR_OFFSET 0x07E8 /* MDIO Write Data Register */
34 #define XEL_MDIORD_OFFSET 0x07EC /* MDIO Read Data Register */
35 #define XEL_MDIOCTRL_OFFSET 0x07F0 /* MDIO Control Register */
36 #define XEL_GIER_OFFSET 0x07F8 /* GIE Register */
37 #define XEL_TSR_OFFSET 0x07FC /* Tx status */
38 #define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */
40 #define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */
41 #define XEL_RPLR_OFFSET 0x100C /* Rx packet length */
42 #define XEL_RSR_OFFSET 0x17FC /* Rx status */
44 #define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */
46 /* MDIO Address Register Bit Masks */
47 #define XEL_MDIOADDR_REGADR_MASK 0x0000001F /* Register Address */
48 #define XEL_MDIOADDR_PHYADR_MASK 0x000003E0 /* PHY Address */
49 #define XEL_MDIOADDR_PHYADR_SHIFT 5
50 #define XEL_MDIOADDR_OP_MASK 0x00000400 /* RD/WR Operation */
52 /* MDIO Write Data Register Bit Masks */
53 #define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */
55 /* MDIO Read Data Register Bit Masks */
56 #define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */
58 /* MDIO Control Register Bit Masks */
59 #define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001 /* MDIO Status Mask */
60 #define XEL_MDIOCTRL_MDIOEN_MASK 0x00000008 /* MDIO Enable */
62 /* Global Interrupt Enable Register (GIER) Bit Masks */
63 #define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */
65 /* Transmit Status Register (TSR) Bit Masks */
66 #define XEL_TSR_XMIT_BUSY_MASK 0x00000001 /* Tx complete */
67 #define XEL_TSR_PROGRAM_MASK 0x00000002 /* Program the MAC address */
68 #define XEL_TSR_XMIT_IE_MASK 0x00000008 /* Tx interrupt enable bit */
69 #define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000 /* Buffer is active, SW bit
70 * 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 - ((uintptr_t)adr)) % ALIGNMENT)
103 #define xemaclite_readl ioread32be
104 #define xemaclite_writel iowrite32be
106 #define xemaclite_readl ioread32
107 #define xemaclite_writel iowrite32
111 * struct net_local - Our private per device data
112 * @ndev: instance of the network device
113 * @tx_ping_pong: indicates whether Tx Pong buffer is configured in HW
114 * @rx_ping_pong: indicates whether Rx Pong buffer is configured in HW
115 * @next_tx_buf_to_use: next Tx buffer to write to
116 * @next_rx_buf_to_use: next Rx buffer to read from
117 * @base_addr: base address of the Emaclite device
118 * @reset_lock: lock used for synchronization
119 * @deferred_skb: holds an skb (for transmission at a later time) when the
120 * Tx buffer is not free
121 * @phy_dev: pointer to the PHY device
122 * @phy_node: pointer to the PHY device node
123 * @mii_bus: pointer to the MII bus
124 * @last_link: last link status
128 struct net_device *ndev;
132 u32 next_tx_buf_to_use;
133 u32 next_rx_buf_to_use;
134 void __iomem *base_addr;
136 spinlock_t reset_lock;
137 struct sk_buff *deferred_skb;
139 struct phy_device *phy_dev;
140 struct device_node *phy_node;
142 struct mii_bus *mii_bus;
148 /*************************/
149 /* EmacLite driver calls */
150 /*************************/
153 * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device
154 * @drvdata: Pointer to the Emaclite device private data
156 * This function enables the Tx and Rx interrupts for the Emaclite device along
157 * with the Global Interrupt Enable.
159 static void xemaclite_enable_interrupts(struct net_local *drvdata)
163 /* Enable the Tx interrupts for the first Buffer */
164 reg_data = xemaclite_readl(drvdata->base_addr + XEL_TSR_OFFSET);
165 xemaclite_writel(reg_data | XEL_TSR_XMIT_IE_MASK,
166 drvdata->base_addr + XEL_TSR_OFFSET);
168 /* Enable the Rx interrupts for the first buffer */
169 xemaclite_writel(XEL_RSR_RECV_IE_MASK, drvdata->base_addr + XEL_RSR_OFFSET);
171 /* Enable the Global Interrupt Enable */
172 xemaclite_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET);
176 * xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device
177 * @drvdata: Pointer to the Emaclite device private data
179 * This function disables the Tx and Rx interrupts for the Emaclite device,
180 * along with the Global Interrupt Enable.
182 static void xemaclite_disable_interrupts(struct net_local *drvdata)
186 /* Disable the Global Interrupt Enable */
187 xemaclite_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET);
189 /* Disable the Tx interrupts for the first buffer */
190 reg_data = xemaclite_readl(drvdata->base_addr + XEL_TSR_OFFSET);
191 xemaclite_writel(reg_data & (~XEL_TSR_XMIT_IE_MASK),
192 drvdata->base_addr + XEL_TSR_OFFSET);
194 /* Disable the Rx interrupts for the first buffer */
195 reg_data = xemaclite_readl(drvdata->base_addr + XEL_RSR_OFFSET);
196 xemaclite_writel(reg_data & (~XEL_RSR_RECV_IE_MASK),
197 drvdata->base_addr + XEL_RSR_OFFSET);
201 * xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address
202 * @src_ptr: Void pointer to the 16-bit aligned source address
203 * @dest_ptr: Pointer to the 32-bit aligned destination address
204 * @length: Number bytes to write from source to destination
206 * This function writes data from a 16-bit aligned buffer to a 32-bit aligned
207 * address in the EmacLite device.
209 static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr,
214 u16 *from_u16_ptr, *to_u16_ptr;
216 to_u32_ptr = dest_ptr;
217 from_u16_ptr = src_ptr;
220 for (; length > 3; length -= 4) {
221 to_u16_ptr = (u16 *)&align_buffer;
222 *to_u16_ptr++ = *from_u16_ptr++;
223 *to_u16_ptr++ = *from_u16_ptr++;
225 /* This barrier resolves occasional issues seen around
226 * cases where the data is not properly flushed out
227 * from the processor store buffers to the destination
233 *to_u32_ptr++ = align_buffer;
236 u8 *from_u8_ptr, *to_u8_ptr;
238 /* Set up to output the remaining data */
240 to_u8_ptr = (u8 *)&align_buffer;
241 from_u8_ptr = (u8 *)from_u16_ptr;
243 /* Output the remaining data */
244 for (; length > 0; length--)
245 *to_u8_ptr++ = *from_u8_ptr++;
247 /* This barrier resolves occasional issues seen around
248 * cases where the data is not properly flushed out
249 * from the processor store buffers to the destination
253 *to_u32_ptr = align_buffer;
258 * xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer
259 * @src_ptr: Pointer to the 32-bit aligned source address
260 * @dest_ptr: Pointer to the 16-bit aligned destination address
261 * @length: Number bytes to read from source to destination
263 * This function reads data from a 32-bit aligned address in the EmacLite device
264 * to a 16-bit aligned buffer.
266 static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr,
269 u16 *to_u16_ptr, *from_u16_ptr;
273 from_u32_ptr = src_ptr;
274 to_u16_ptr = (u16 *)dest_ptr;
276 for (; length > 3; length -= 4) {
277 /* Copy each word into the temporary buffer */
278 align_buffer = *from_u32_ptr++;
279 from_u16_ptr = (u16 *)&align_buffer;
281 /* Read data from source */
282 *to_u16_ptr++ = *from_u16_ptr++;
283 *to_u16_ptr++ = *from_u16_ptr++;
287 u8 *to_u8_ptr, *from_u8_ptr;
289 /* Set up to read the remaining data */
290 to_u8_ptr = (u8 *)to_u16_ptr;
291 align_buffer = *from_u32_ptr++;
292 from_u8_ptr = (u8 *)&align_buffer;
294 /* Read the remaining data */
295 for (; length > 0; length--)
296 *to_u8_ptr = *from_u8_ptr;
301 * xemaclite_send_data - Send an Ethernet frame
302 * @drvdata: Pointer to the Emaclite device private data
303 * @data: Pointer to the data to be sent
304 * @byte_count: Total frame size, including header
306 * This function checks if the Tx buffer of the Emaclite device is free to send
307 * data. If so, it fills the Tx buffer with data for transmission. Otherwise, it
310 * Return: 0 upon success or -1 if the buffer(s) are full.
312 * Note: The maximum Tx packet size can not be more than Ethernet header
313 * (14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS.
315 static int xemaclite_send_data(struct net_local *drvdata, u8 *data,
316 unsigned int byte_count)
321 /* Determine the expected Tx buffer address */
322 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
324 /* If the length is too large, truncate it */
325 if (byte_count > ETH_FRAME_LEN)
326 byte_count = ETH_FRAME_LEN;
328 /* Check if the expected buffer is available */
329 reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
330 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
331 XEL_TSR_XMIT_ACTIVE_MASK)) == 0) {
333 /* Switch to next buffer if configured */
334 if (drvdata->tx_ping_pong != 0)
335 drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET;
336 } else if (drvdata->tx_ping_pong != 0) {
337 /* If the expected buffer is full, try the other buffer,
338 * if it is configured in HW
341 addr = (void __iomem __force *)((uintptr_t __force)addr ^
343 reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
345 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
346 XEL_TSR_XMIT_ACTIVE_MASK)) != 0)
347 return -1; /* Buffers were full, return failure */
349 return -1; /* Buffer was full, return failure */
351 /* Write the frame to the buffer */
352 xemaclite_aligned_write(data, (u32 __force *)addr, byte_count);
354 xemaclite_writel((byte_count & XEL_TPLR_LENGTH_MASK),
355 addr + XEL_TPLR_OFFSET);
357 /* Update the Tx Status Register to indicate that there is a
358 * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which
359 * is used by the interrupt handler to check whether a frame
360 * has been transmitted
362 reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
363 reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK);
364 xemaclite_writel(reg_data, addr + XEL_TSR_OFFSET);
370 * xemaclite_recv_data - Receive a frame
371 * @drvdata: Pointer to the Emaclite device private data
372 * @data: Address where the data is to be received
373 * @maxlen: Maximum supported ethernet packet length
375 * This function is intended to be called from the interrupt context or
376 * with a wrapper which waits for the receive frame to be available.
378 * Return: Total number of bytes received
380 static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data, int maxlen)
383 u16 length, proto_type;
386 /* Determine the expected buffer address */
387 addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use);
389 /* Verify which buffer has valid data */
390 reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
392 if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
393 if (drvdata->rx_ping_pong != 0)
394 drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET;
396 /* The instance is out of sync, try other buffer if other
397 * buffer is configured, return 0 otherwise. If the instance is
398 * out of sync, do not update the 'next_rx_buf_to_use' since it
399 * will correct on subsequent calls
401 if (drvdata->rx_ping_pong != 0)
402 addr = (void __iomem __force *)
403 ((uintptr_t __force)addr ^
406 return 0; /* No data was available */
408 /* Verify that buffer has valid data */
409 reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
410 if ((reg_data & XEL_RSR_RECV_DONE_MASK) !=
411 XEL_RSR_RECV_DONE_MASK)
412 return 0; /* No data was available */
415 /* Get the protocol type of the ethernet frame that arrived
417 proto_type = ((ntohl(xemaclite_readl(addr + XEL_HEADER_OFFSET +
418 XEL_RXBUFF_OFFSET)) >> XEL_HEADER_SHIFT) &
419 XEL_RPLR_LENGTH_MASK);
421 /* Check if received ethernet frame is a raw ethernet frame
422 * or an IP packet or an ARP packet
424 if (proto_type > ETH_DATA_LEN) {
426 if (proto_type == ETH_P_IP) {
427 length = ((ntohl(xemaclite_readl(addr +
428 XEL_HEADER_IP_LENGTH_OFFSET +
429 XEL_RXBUFF_OFFSET)) >>
431 XEL_RPLR_LENGTH_MASK);
432 length = min_t(u16, length, ETH_DATA_LEN);
433 length += ETH_HLEN + ETH_FCS_LEN;
435 } else if (proto_type == ETH_P_ARP)
436 length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN;
438 /* Field contains type other than IP or ARP, use max
439 * frame size and let user parse it
441 length = ETH_FRAME_LEN + ETH_FCS_LEN;
443 /* Use the length in the frame, plus the header and trailer */
444 length = proto_type + ETH_HLEN + ETH_FCS_LEN;
446 if (WARN_ON(length > maxlen))
449 /* Read from the EmacLite device */
450 xemaclite_aligned_read((u32 __force *)(addr + XEL_RXBUFF_OFFSET),
453 /* Acknowledge the frame */
454 reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
455 reg_data &= ~XEL_RSR_RECV_DONE_MASK;
456 xemaclite_writel(reg_data, addr + XEL_RSR_OFFSET);
462 * xemaclite_update_address - Update the MAC address in the device
463 * @drvdata: Pointer to the Emaclite device private data
464 * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value)
466 * Tx must be idle and Rx should be idle for deterministic results.
467 * It is recommended that this function should be called after the
468 * initialization and before transmission of any packets from the device.
469 * The MAC address can be programmed using any of the two transmit
470 * buffers (if configured).
472 static void xemaclite_update_address(struct net_local *drvdata,
478 /* Determine the expected Tx buffer address */
479 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
481 xemaclite_aligned_write(address_ptr, (u32 __force *)addr, ETH_ALEN);
483 xemaclite_writel(ETH_ALEN, addr + XEL_TPLR_OFFSET);
485 /* Update the MAC address in the EmacLite */
486 reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
487 xemaclite_writel(reg_data | XEL_TSR_PROG_MAC_ADDR, addr + XEL_TSR_OFFSET);
489 /* Wait for EmacLite to finish with the MAC address update */
490 while ((xemaclite_readl(addr + XEL_TSR_OFFSET) &
491 XEL_TSR_PROG_MAC_ADDR) != 0)
496 * xemaclite_set_mac_address - Set the MAC address for this device
497 * @dev: Pointer to the network device instance
498 * @address: Void pointer to the sockaddr structure
500 * This function copies the HW address from the sockaddr strucutre to the
501 * net_device structure and updates the address in HW.
503 * Return: Error if the net device is busy or 0 if the addr is set
506 static int xemaclite_set_mac_address(struct net_device *dev, void *address)
508 struct net_local *lp = netdev_priv(dev);
509 struct sockaddr *addr = address;
511 if (netif_running(dev))
514 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
515 xemaclite_update_address(lp, dev->dev_addr);
520 * xemaclite_tx_timeout - Callback for Tx Timeout
521 * @dev: Pointer to the network device
524 * This function is called when Tx time out occurs for Emaclite device.
526 static void xemaclite_tx_timeout(struct net_device *dev, unsigned int txqueue)
528 struct net_local *lp = netdev_priv(dev);
531 dev_err(&lp->ndev->dev, "Exceeded transmit timeout of %lu ms\n",
532 TX_TIMEOUT * 1000UL / HZ);
534 dev->stats.tx_errors++;
536 /* Reset the device */
537 spin_lock_irqsave(&lp->reset_lock, flags);
539 /* Shouldn't really be necessary, but shouldn't hurt */
540 netif_stop_queue(dev);
542 xemaclite_disable_interrupts(lp);
543 xemaclite_enable_interrupts(lp);
545 if (lp->deferred_skb) {
546 dev_kfree_skb(lp->deferred_skb);
547 lp->deferred_skb = NULL;
548 dev->stats.tx_errors++;
551 /* To exclude tx timeout */
552 netif_trans_update(dev); /* prevent tx timeout */
554 /* We're all ready to go. Start the queue */
555 netif_wake_queue(dev);
556 spin_unlock_irqrestore(&lp->reset_lock, flags);
559 /**********************/
560 /* Interrupt Handlers */
561 /**********************/
564 * xemaclite_tx_handler - Interrupt handler for frames sent
565 * @dev: Pointer to the network device
567 * This function updates the number of packets transmitted and handles the
568 * deferred skb, if there is one.
570 static void xemaclite_tx_handler(struct net_device *dev)
572 struct net_local *lp = netdev_priv(dev);
574 dev->stats.tx_packets++;
576 if (!lp->deferred_skb)
579 if (xemaclite_send_data(lp, (u8 *)lp->deferred_skb->data,
580 lp->deferred_skb->len))
583 dev->stats.tx_bytes += lp->deferred_skb->len;
584 dev_consume_skb_irq(lp->deferred_skb);
585 lp->deferred_skb = NULL;
586 netif_trans_update(dev); /* prevent tx timeout */
587 netif_wake_queue(dev);
591 * xemaclite_rx_handler- Interrupt handler for frames received
592 * @dev: Pointer to the network device
594 * This function allocates memory for a socket buffer, fills it with data
595 * received and hands it over to the TCP/IP stack.
597 static void xemaclite_rx_handler(struct net_device *dev)
599 struct net_local *lp = netdev_priv(dev);
604 len = ETH_FRAME_LEN + ETH_FCS_LEN;
605 skb = netdev_alloc_skb(dev, len + ALIGNMENT);
607 /* Couldn't get memory. */
608 dev->stats.rx_dropped++;
609 dev_err(&lp->ndev->dev, "Could not allocate receive buffer\n");
613 /* A new skb should have the data halfword aligned, but this code is
614 * here just in case that isn't true. Calculate how many
615 * bytes we should reserve to get the data to start on a word
618 align = BUFFER_ALIGN(skb->data);
620 skb_reserve(skb, align);
624 len = xemaclite_recv_data(lp, (u8 *)skb->data, len);
627 dev->stats.rx_errors++;
628 dev_kfree_skb_irq(skb);
632 skb_put(skb, len); /* Tell the skb how much data we got */
634 skb->protocol = eth_type_trans(skb, dev);
635 skb_checksum_none_assert(skb);
637 dev->stats.rx_packets++;
638 dev->stats.rx_bytes += len;
640 if (!skb_defer_rx_timestamp(skb))
641 netif_rx(skb); /* Send the packet upstream */
645 * xemaclite_interrupt - Interrupt handler for this driver
646 * @irq: Irq of the Emaclite device
647 * @dev_id: Void pointer to the network device instance used as callback
650 * Return: IRQ_HANDLED
652 * This function handles the Tx and Rx interrupts of the EmacLite device.
654 static irqreturn_t xemaclite_interrupt(int irq, void *dev_id)
656 bool tx_complete = false;
657 struct net_device *dev = dev_id;
658 struct net_local *lp = netdev_priv(dev);
659 void __iomem *base_addr = lp->base_addr;
662 /* Check if there is Rx Data available */
663 if ((xemaclite_readl(base_addr + XEL_RSR_OFFSET) &
664 XEL_RSR_RECV_DONE_MASK) ||
665 (xemaclite_readl(base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET)
666 & XEL_RSR_RECV_DONE_MASK))
668 xemaclite_rx_handler(dev);
670 /* Check if the Transmission for the first buffer is completed */
671 tx_status = xemaclite_readl(base_addr + XEL_TSR_OFFSET);
672 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
673 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
675 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
676 xemaclite_writel(tx_status, base_addr + XEL_TSR_OFFSET);
681 /* Check if the Transmission for the second buffer is completed */
682 tx_status = xemaclite_readl(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
683 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
684 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
686 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
687 xemaclite_writel(tx_status, base_addr + XEL_BUFFER_OFFSET +
693 /* If there was a Tx interrupt, call the Tx Handler */
694 if (tx_complete != 0)
695 xemaclite_tx_handler(dev);
700 /**********************/
701 /* MDIO Bus functions */
702 /**********************/
705 * xemaclite_mdio_wait - Wait for the MDIO to be ready to use
706 * @lp: Pointer to the Emaclite device private data
708 * This function waits till the device is ready to accept a new MDIO
711 * Return: 0 for success or ETIMEDOUT for a timeout
714 static int xemaclite_mdio_wait(struct net_local *lp)
718 /* wait for the MDIO interface to not be busy or timeout
721 return readx_poll_timeout(xemaclite_readl,
722 lp->base_addr + XEL_MDIOCTRL_OFFSET,
723 val, !(val & XEL_MDIOCTRL_MDIOSTS_MASK),
728 * xemaclite_mdio_read - Read from a given MII management register
729 * @bus: the mii_bus struct
730 * @phy_id: the phy address
731 * @reg: register number to read from
733 * This function waits till the device is ready to accept a new MDIO
734 * request and then writes the phy address to the MDIO Address register
735 * and reads data from MDIO Read Data register, when its available.
737 * Return: Value read from the MII management register
739 static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg)
741 struct net_local *lp = bus->priv;
745 if (xemaclite_mdio_wait(lp))
748 /* Write the PHY address, register number and set the OP bit in the
749 * MDIO Address register. Set the Status bit in the MDIO Control
750 * register to start a MDIO read transaction.
752 ctrl_reg = xemaclite_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET);
753 xemaclite_writel(XEL_MDIOADDR_OP_MASK |
754 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg),
755 lp->base_addr + XEL_MDIOADDR_OFFSET);
756 xemaclite_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK,
757 lp->base_addr + XEL_MDIOCTRL_OFFSET);
759 if (xemaclite_mdio_wait(lp))
762 rc = xemaclite_readl(lp->base_addr + XEL_MDIORD_OFFSET);
764 dev_dbg(&lp->ndev->dev,
765 "%s(phy_id=%i, reg=%x) == %x\n", __func__,
772 * xemaclite_mdio_write - Write to a given MII management register
773 * @bus: the mii_bus struct
774 * @phy_id: the phy address
775 * @reg: register number to write to
776 * @val: value to write to the register number specified by reg
778 * This function waits till the device is ready to accept a new MDIO
779 * request and then writes the val to the MDIO Write Data register.
781 * Return: 0 upon success or a negative error upon failure
783 static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg,
786 struct net_local *lp = bus->priv;
789 dev_dbg(&lp->ndev->dev,
790 "%s(phy_id=%i, reg=%x, val=%x)\n", __func__,
793 if (xemaclite_mdio_wait(lp))
796 /* Write the PHY address, register number and clear the OP bit in the
797 * MDIO Address register and then write the value into the MDIO Write
798 * Data register. Finally, set the Status bit in the MDIO Control
799 * register to start a MDIO write transaction.
801 ctrl_reg = xemaclite_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET);
802 xemaclite_writel(~XEL_MDIOADDR_OP_MASK &
803 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg),
804 lp->base_addr + XEL_MDIOADDR_OFFSET);
805 xemaclite_writel(val, lp->base_addr + XEL_MDIOWR_OFFSET);
806 xemaclite_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK,
807 lp->base_addr + XEL_MDIOCTRL_OFFSET);
813 * xemaclite_mdio_setup - Register mii_bus for the Emaclite device
814 * @lp: Pointer to the Emaclite device private data
815 * @dev: Pointer to OF device structure
817 * This function enables MDIO bus in the Emaclite device and registers a
820 * Return: 0 upon success or a negative error upon failure
822 static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev)
827 struct device_node *np = of_get_parent(lp->phy_node);
828 struct device_node *npp;
830 /* Don't register the MDIO bus if the phy_node or its parent node
834 dev_err(dev, "Failed to register mdio bus.\n");
837 npp = of_get_parent(np);
839 of_address_to_resource(npp, 0, &res);
840 if (lp->ndev->mem_start != res.start) {
841 struct phy_device *phydev;
842 phydev = of_phy_find_device(lp->phy_node);
845 "MDIO of the phy is not registered yet\n");
847 put_device(&phydev->mdio.dev);
851 /* Enable the MDIO bus by asserting the enable bit in MDIO Control
854 xemaclite_writel(XEL_MDIOCTRL_MDIOEN_MASK,
855 lp->base_addr + XEL_MDIOCTRL_OFFSET);
857 bus = mdiobus_alloc();
859 dev_err(dev, "Failed to allocate mdiobus\n");
863 snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
864 (unsigned long long)res.start);
866 bus->name = "Xilinx Emaclite MDIO";
867 bus->read = xemaclite_mdio_read;
868 bus->write = xemaclite_mdio_write;
871 rc = of_mdiobus_register(bus, np);
873 dev_err(dev, "Failed to register mdio bus.\n");
887 * xemaclite_adjust_link - Link state callback for the Emaclite device
888 * @ndev: pointer to net_device struct
890 * There's nothing in the Emaclite device to be configured when the link
891 * state changes. We just print the status.
893 static void xemaclite_adjust_link(struct net_device *ndev)
895 struct net_local *lp = netdev_priv(ndev);
896 struct phy_device *phy = lp->phy_dev;
899 /* hash together the state values to decide if something has changed */
900 link_state = phy->speed | (phy->duplex << 1) | phy->link;
902 if (lp->last_link != link_state) {
903 lp->last_link = link_state;
904 phy_print_status(phy);
909 * xemaclite_open - Open the network device
910 * @dev: Pointer to the network device
912 * This function sets the MAC address, requests an IRQ and enables interrupts
913 * for the Emaclite device and starts the Tx queue.
914 * It also connects to the phy device, if MDIO is included in Emaclite device.
916 * Return: 0 on success. -ENODEV, if PHY cannot be connected.
917 * Non-zero error value on failure.
919 static int xemaclite_open(struct net_device *dev)
921 struct net_local *lp = 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 phy_set_max_speed(lp->phy_dev, SPEED_100);
941 /* Don't advertise 1000BASE-T Full/Half duplex speeds */
942 phy_write(lp->phy_dev, MII_CTRL1000, 0);
944 /* Advertise only 10 and 100mbps full/half duplex speeds */
945 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.
990 static int xemaclite_close(struct net_device *dev)
992 struct net_local *lp = netdev_priv(dev);
994 netif_stop_queue(dev);
995 xemaclite_disable_interrupts(lp);
996 free_irq(dev->irq, dev);
999 phy_disconnect(lp->phy_dev);
1006 * xemaclite_send - Transmit a frame
1007 * @orig_skb: Pointer to the socket buffer to be transmitted
1008 * @dev: Pointer to the network device
1010 * This function checks if the Tx buffer of the Emaclite device is free to send
1011 * data. If so, it fills the Tx buffer with data from socket buffer data,
1012 * updates the stats and frees the socket buffer. The Tx completion is signaled
1013 * by an interrupt. If the Tx buffer isn't free, then the socket buffer is
1014 * deferred and the Tx queue is stopped so that the deferred socket buffer can
1015 * be transmitted when the Emaclite device is free to transmit data.
1017 * Return: NETDEV_TX_OK, always.
1020 xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev)
1022 struct net_local *lp = netdev_priv(dev);
1023 struct sk_buff *new_skb;
1025 unsigned long flags;
1027 len = orig_skb->len;
1031 spin_lock_irqsave(&lp->reset_lock, flags);
1032 if (xemaclite_send_data(lp, (u8 *)new_skb->data, len) != 0) {
1033 /* If the Emaclite Tx buffer is busy, stop the Tx queue and
1034 * defer the skb for transmission during the ISR, after the
1035 * current transmission is complete
1037 netif_stop_queue(dev);
1038 lp->deferred_skb = new_skb;
1039 /* Take the time stamp now, since we can't do this in an ISR. */
1040 skb_tx_timestamp(new_skb);
1041 spin_unlock_irqrestore(&lp->reset_lock, flags);
1042 return NETDEV_TX_OK;
1044 spin_unlock_irqrestore(&lp->reset_lock, flags);
1046 skb_tx_timestamp(new_skb);
1048 dev->stats.tx_bytes += len;
1049 dev_consume_skb_any(new_skb);
1051 return NETDEV_TX_OK;
1055 * get_bool - Get a parameter from the OF device
1056 * @ofdev: Pointer to OF device structure
1057 * @s: Property to be retrieved
1059 * This function looks for a property in the device node and returns the value
1060 * of the property if its found or 0 if the property is not found.
1062 * Return: Value of the parameter if the parameter is found, or 0 otherwise
1064 static bool get_bool(struct platform_device *ofdev, const char *s)
1066 u32 *p = (u32 *)of_get_property(ofdev->dev.of_node, s, NULL);
1069 dev_warn(&ofdev->dev, "Parameter %s not found, defaulting to false\n", s);
1077 * xemaclite_ethtools_get_drvinfo - Get various Axi Emac Lite driver info
1078 * @ndev: Pointer to net_device structure
1079 * @ed: Pointer to ethtool_drvinfo structure
1081 * This implements ethtool command for getting the driver information.
1082 * Issue "ethtool -i ethX" under linux prompt to execute this function.
1084 static void xemaclite_ethtools_get_drvinfo(struct net_device *ndev,
1085 struct ethtool_drvinfo *ed)
1087 strlcpy(ed->driver, DRIVER_NAME, sizeof(ed->driver));
1090 static const struct ethtool_ops xemaclite_ethtool_ops = {
1091 .get_drvinfo = xemaclite_ethtools_get_drvinfo,
1092 .get_link = ethtool_op_get_link,
1093 .get_link_ksettings = phy_ethtool_get_link_ksettings,
1094 .set_link_ksettings = phy_ethtool_set_link_ksettings,
1097 static const struct net_device_ops xemaclite_netdev_ops;
1100 * xemaclite_of_probe - Probe method for the Emaclite device.
1101 * @ofdev: Pointer to OF device structure
1103 * This function probes for the Emaclite device in the device tree.
1104 * It initializes the driver data structure and the hardware, sets the MAC
1105 * address and registers the network device.
1106 * It also registers a mii_bus for the Emaclite device, if MDIO is included
1109 * Return: 0, if the driver is bound to the Emaclite device, or
1110 * a negative error if there is failure.
1112 static int xemaclite_of_probe(struct platform_device *ofdev)
1114 struct resource *res;
1115 struct net_device *ndev = NULL;
1116 struct net_local *lp = NULL;
1117 struct device *dev = &ofdev->dev;
1121 dev_info(dev, "Device Tree Probing\n");
1123 /* Create an ethernet device instance */
1124 ndev = alloc_etherdev(sizeof(struct net_local));
1128 dev_set_drvdata(dev, ndev);
1129 SET_NETDEV_DEV(ndev, &ofdev->dev);
1131 lp = netdev_priv(ndev);
1134 /* Get IRQ for the device */
1135 res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
1137 dev_err(dev, "no IRQ found\n");
1142 ndev->irq = res->start;
1144 res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
1145 lp->base_addr = devm_ioremap_resource(&ofdev->dev, res);
1146 if (IS_ERR(lp->base_addr)) {
1147 rc = PTR_ERR(lp->base_addr);
1151 ndev->mem_start = res->start;
1152 ndev->mem_end = res->end;
1154 spin_lock_init(&lp->reset_lock);
1155 lp->next_tx_buf_to_use = 0x0;
1156 lp->next_rx_buf_to_use = 0x0;
1157 lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong");
1158 lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong");
1160 rc = of_get_mac_address(ofdev->dev.of_node, ndev->dev_addr);
1162 dev_warn(dev, "No MAC address found, using random\n");
1163 eth_hw_addr_random(ndev);
1166 /* Clear the Tx CSR's in case this is a restart */
1167 xemaclite_writel(0, lp->base_addr + XEL_TSR_OFFSET);
1168 xemaclite_writel(0, lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
1170 /* Set the MAC address in the EmacLite device */
1171 xemaclite_update_address(lp, ndev->dev_addr);
1173 lp->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
1174 xemaclite_mdio_setup(lp, &ofdev->dev);
1176 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
1178 ndev->netdev_ops = &xemaclite_netdev_ops;
1179 ndev->ethtool_ops = &xemaclite_ethtool_ops;
1180 ndev->flags &= ~IFF_MULTICAST;
1181 ndev->watchdog_timeo = TX_TIMEOUT;
1183 /* Finally, register the device */
1184 rc = register_netdev(ndev);
1187 "Cannot register network device, aborting\n");
1192 "Xilinx EmacLite at 0x%08lX mapped to 0x%p, irq=%d\n",
1193 (unsigned long __force)ndev->mem_start, lp->base_addr, ndev->irq);
1202 * xemaclite_of_remove - Unbind the driver from the Emaclite device.
1203 * @of_dev: Pointer to OF device structure
1205 * This function is called if a device is physically removed from the system or
1206 * if the driver module is being unloaded. It frees any resources allocated to
1209 * Return: 0, always.
1211 static int xemaclite_of_remove(struct platform_device *of_dev)
1213 struct net_device *ndev = platform_get_drvdata(of_dev);
1215 struct net_local *lp = netdev_priv(ndev);
1217 /* Un-register the mii_bus, if configured */
1219 mdiobus_unregister(lp->mii_bus);
1220 mdiobus_free(lp->mii_bus);
1224 unregister_netdev(ndev);
1226 of_node_put(lp->phy_node);
1227 lp->phy_node = NULL;
1234 #ifdef CONFIG_NET_POLL_CONTROLLER
1236 xemaclite_poll_controller(struct net_device *ndev)
1238 disable_irq(ndev->irq);
1239 xemaclite_interrupt(ndev->irq, ndev);
1240 enable_irq(ndev->irq);
1244 /* Ioctl MII Interface */
1245 static int xemaclite_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1247 if (!dev->phydev || !netif_running(dev))
1254 return phy_mii_ioctl(dev->phydev, rq, cmd);
1260 static const struct net_device_ops xemaclite_netdev_ops = {
1261 .ndo_open = xemaclite_open,
1262 .ndo_stop = xemaclite_close,
1263 .ndo_start_xmit = xemaclite_send,
1264 .ndo_set_mac_address = xemaclite_set_mac_address,
1265 .ndo_tx_timeout = xemaclite_tx_timeout,
1266 .ndo_do_ioctl = xemaclite_ioctl,
1267 #ifdef CONFIG_NET_POLL_CONTROLLER
1268 .ndo_poll_controller = xemaclite_poll_controller,
1272 /* Match table for OF platform binding */
1273 static const struct of_device_id xemaclite_of_match[] = {
1274 { .compatible = "xlnx,opb-ethernetlite-1.01.a", },
1275 { .compatible = "xlnx,opb-ethernetlite-1.01.b", },
1276 { .compatible = "xlnx,xps-ethernetlite-1.00.a", },
1277 { .compatible = "xlnx,xps-ethernetlite-2.00.a", },
1278 { .compatible = "xlnx,xps-ethernetlite-2.01.a", },
1279 { .compatible = "xlnx,xps-ethernetlite-3.00.a", },
1280 { /* end of list */ },
1282 MODULE_DEVICE_TABLE(of, xemaclite_of_match);
1284 static struct platform_driver xemaclite_of_driver = {
1286 .name = DRIVER_NAME,
1287 .of_match_table = xemaclite_of_match,
1289 .probe = xemaclite_of_probe,
1290 .remove = xemaclite_of_remove,
1293 module_platform_driver(xemaclite_of_driver);
1295 MODULE_AUTHOR("Xilinx, Inc.");
1296 MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver");
1297 MODULE_LICENSE("GPL");