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
7 * 2007 - 2013 (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/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/skbuff.h>
21 #include <linux/slab.h>
22 #include <linux/of_address.h>
23 #include <linux/of_device.h>
24 #include <linux/of_platform.h>
25 #include <linux/of_mdio.h>
26 #include <linux/of_net.h>
27 #include <linux/phy.h>
28 #include <linux/interrupt.h>
30 #define DRIVER_NAME "xilinx_emaclite"
32 /* Register offsets for the EmacLite Core */
33 #define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */
34 #define XEL_MDIOADDR_OFFSET 0x07E4 /* MDIO Address Register */
35 #define XEL_MDIOWR_OFFSET 0x07E8 /* MDIO Write Data Register */
36 #define XEL_MDIORD_OFFSET 0x07EC /* MDIO Read Data Register */
37 #define XEL_MDIOCTRL_OFFSET 0x07F0 /* MDIO Control Register */
38 #define XEL_GIER_OFFSET 0x07F8 /* GIE Register */
39 #define XEL_TSR_OFFSET 0x07FC /* Tx status */
40 #define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */
42 #define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */
43 #define XEL_RPLR_OFFSET 0x100C /* Rx packet length */
44 #define XEL_RSR_OFFSET 0x17FC /* Rx status */
46 #define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */
48 /* MDIO Address Register Bit Masks */
49 #define XEL_MDIOADDR_REGADR_MASK 0x0000001F /* Register Address */
50 #define XEL_MDIOADDR_PHYADR_MASK 0x000003E0 /* PHY Address */
51 #define XEL_MDIOADDR_PHYADR_SHIFT 5
52 #define XEL_MDIOADDR_OP_MASK 0x00000400 /* RD/WR Operation */
54 /* MDIO Write Data Register Bit Masks */
55 #define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */
57 /* MDIO Read Data Register Bit Masks */
58 #define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */
60 /* MDIO Control Register Bit Masks */
61 #define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001 /* MDIO Status Mask */
62 #define XEL_MDIOCTRL_MDIOEN_MASK 0x00000008 /* MDIO Enable */
64 /* Global Interrupt Enable Register (GIER) Bit Masks */
65 #define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */
67 /* Transmit Status Register (TSR) Bit Masks */
68 #define XEL_TSR_XMIT_BUSY_MASK 0x00000001 /* Tx complete */
69 #define XEL_TSR_PROGRAM_MASK 0x00000002 /* Program the MAC address */
70 #define XEL_TSR_XMIT_IE_MASK 0x00000008 /* Tx interrupt enable bit */
71 #define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000 /* Buffer is active, SW bit
72 * only. This is not documented
76 /* Define for programming the MAC address into the EmacLite */
77 #define XEL_TSR_PROG_MAC_ADDR (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_PROGRAM_MASK)
79 /* Receive Status Register (RSR) */
80 #define XEL_RSR_RECV_DONE_MASK 0x00000001 /* Rx complete */
81 #define XEL_RSR_RECV_IE_MASK 0x00000008 /* Rx interrupt enable bit */
83 /* Transmit Packet Length Register (TPLR) */
84 #define XEL_TPLR_LENGTH_MASK 0x0000FFFF /* Tx packet length */
86 /* Receive Packet Length Register (RPLR) */
87 #define XEL_RPLR_LENGTH_MASK 0x0000FFFF /* Rx packet length */
89 #define XEL_HEADER_OFFSET 12 /* Offset to length field */
90 #define XEL_HEADER_SHIFT 16 /* Shift value for length */
92 /* General Ethernet Definitions */
93 #define XEL_ARP_PACKET_SIZE 28 /* Max ARP packet size */
94 #define XEL_HEADER_IP_LENGTH_OFFSET 16 /* IP Length Offset */
98 #define TX_TIMEOUT (60 * HZ) /* Tx timeout is 60 seconds. */
101 /* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */
102 #define BUFFER_ALIGN(adr) ((ALIGNMENT - ((u32)adr)) % ALIGNMENT)
105 #define xemaclite_readl ioread32be
106 #define xemaclite_writel iowrite32be
108 #define xemaclite_readl ioread32
109 #define xemaclite_writel iowrite32
113 * struct net_local - Our private per device data
114 * @ndev: instance of the network device
115 * @tx_ping_pong: indicates whether Tx Pong buffer is configured in HW
116 * @rx_ping_pong: indicates whether Rx Pong buffer is configured in HW
117 * @next_tx_buf_to_use: next Tx buffer to write to
118 * @next_rx_buf_to_use: next Rx buffer to read from
119 * @base_addr: base address of the Emaclite device
120 * @reset_lock: lock used for synchronization
121 * @deferred_skb: holds an skb (for transmission at a later time) when the
122 * Tx buffer is not free
123 * @phy_dev: pointer to the PHY device
124 * @phy_node: pointer to the PHY device node
125 * @mii_bus: pointer to the MII bus
126 * @last_link: last link status
130 struct net_device *ndev;
134 u32 next_tx_buf_to_use;
135 u32 next_rx_buf_to_use;
136 void __iomem *base_addr;
138 spinlock_t reset_lock;
139 struct sk_buff *deferred_skb;
141 struct phy_device *phy_dev;
142 struct device_node *phy_node;
144 struct mii_bus *mii_bus;
150 /*************************/
151 /* EmacLite driver calls */
152 /*************************/
155 * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device
156 * @drvdata: Pointer to the Emaclite device private data
158 * This function enables the Tx and Rx interrupts for the Emaclite device along
159 * with the Global Interrupt Enable.
161 static void xemaclite_enable_interrupts(struct net_local *drvdata)
165 /* Enable the Tx interrupts for the first Buffer */
166 reg_data = xemaclite_readl(drvdata->base_addr + XEL_TSR_OFFSET);
167 xemaclite_writel(reg_data | XEL_TSR_XMIT_IE_MASK,
168 drvdata->base_addr + XEL_TSR_OFFSET);
170 /* Enable the Rx interrupts for the first buffer */
171 xemaclite_writel(XEL_RSR_RECV_IE_MASK, drvdata->base_addr + XEL_RSR_OFFSET);
173 /* Enable the Global Interrupt Enable */
174 xemaclite_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET);
178 * xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device
179 * @drvdata: Pointer to the Emaclite device private data
181 * This function disables the Tx and Rx interrupts for the Emaclite device,
182 * along with the Global Interrupt Enable.
184 static void xemaclite_disable_interrupts(struct net_local *drvdata)
188 /* Disable the Global Interrupt Enable */
189 xemaclite_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET);
191 /* Disable the Tx interrupts for the first buffer */
192 reg_data = xemaclite_readl(drvdata->base_addr + XEL_TSR_OFFSET);
193 xemaclite_writel(reg_data & (~XEL_TSR_XMIT_IE_MASK),
194 drvdata->base_addr + XEL_TSR_OFFSET);
196 /* Disable the Rx interrupts for the first buffer */
197 reg_data = xemaclite_readl(drvdata->base_addr + XEL_RSR_OFFSET);
198 xemaclite_writel(reg_data & (~XEL_RSR_RECV_IE_MASK),
199 drvdata->base_addr + XEL_RSR_OFFSET);
203 * xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address
204 * @src_ptr: Void pointer to the 16-bit aligned source address
205 * @dest_ptr: Pointer to the 32-bit aligned destination address
206 * @length: Number bytes to write from source to destination
208 * This function writes data from a 16-bit aligned buffer to a 32-bit aligned
209 * address in the EmacLite device.
211 static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr,
216 u16 *from_u16_ptr, *to_u16_ptr;
218 to_u32_ptr = dest_ptr;
219 from_u16_ptr = src_ptr;
222 for (; length > 3; length -= 4) {
223 to_u16_ptr = (u16 *)&align_buffer;
224 *to_u16_ptr++ = *from_u16_ptr++;
225 *to_u16_ptr++ = *from_u16_ptr++;
227 /* This barrier resolves occasional issues seen around
228 * cases where the data is not properly flushed out
229 * from the processor store buffers to the destination
235 *to_u32_ptr++ = align_buffer;
238 u8 *from_u8_ptr, *to_u8_ptr;
240 /* Set up to output the remaining data */
242 to_u8_ptr = (u8 *)&align_buffer;
243 from_u8_ptr = (u8 *)from_u16_ptr;
245 /* Output the remaining data */
246 for (; length > 0; length--)
247 *to_u8_ptr++ = *from_u8_ptr++;
249 /* This barrier resolves occasional issues seen around
250 * cases where the data is not properly flushed out
251 * from the processor store buffers to the destination
255 *to_u32_ptr = align_buffer;
260 * xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer
261 * @src_ptr: Pointer to the 32-bit aligned source address
262 * @dest_ptr: Pointer to the 16-bit aligned destination address
263 * @length: Number bytes to read from source to destination
265 * This function reads data from a 32-bit aligned address in the EmacLite device
266 * to a 16-bit aligned buffer.
268 static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr,
271 u16 *to_u16_ptr, *from_u16_ptr;
275 from_u32_ptr = src_ptr;
276 to_u16_ptr = (u16 *)dest_ptr;
278 for (; length > 3; length -= 4) {
279 /* Copy each word into the temporary buffer */
280 align_buffer = *from_u32_ptr++;
281 from_u16_ptr = (u16 *)&align_buffer;
283 /* Read data from source */
284 *to_u16_ptr++ = *from_u16_ptr++;
285 *to_u16_ptr++ = *from_u16_ptr++;
289 u8 *to_u8_ptr, *from_u8_ptr;
291 /* Set up to read the remaining data */
292 to_u8_ptr = (u8 *)to_u16_ptr;
293 align_buffer = *from_u32_ptr++;
294 from_u8_ptr = (u8 *)&align_buffer;
296 /* Read the remaining data */
297 for (; length > 0; length--)
298 *to_u8_ptr = *from_u8_ptr;
303 * xemaclite_send_data - Send an Ethernet frame
304 * @drvdata: Pointer to the Emaclite device private data
305 * @data: Pointer to the data to be sent
306 * @byte_count: Total frame size, including header
308 * This function checks if the Tx buffer of the Emaclite device is free to send
309 * data. If so, it fills the Tx buffer with data for transmission. Otherwise, it
312 * Return: 0 upon success or -1 if the buffer(s) are full.
314 * Note: The maximum Tx packet size can not be more than Ethernet header
315 * (14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS.
317 static int xemaclite_send_data(struct net_local *drvdata, u8 *data,
318 unsigned int byte_count)
323 /* Determine the expected Tx buffer address */
324 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
326 /* If the length is too large, truncate it */
327 if (byte_count > ETH_FRAME_LEN)
328 byte_count = ETH_FRAME_LEN;
330 /* Check if the expected buffer is available */
331 reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
332 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
333 XEL_TSR_XMIT_ACTIVE_MASK)) == 0) {
335 /* Switch to next buffer if configured */
336 if (drvdata->tx_ping_pong != 0)
337 drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET;
338 } else if (drvdata->tx_ping_pong != 0) {
339 /* If the expected buffer is full, try the other buffer,
340 * if it is configured in HW
343 addr = (void __iomem __force *)((u32 __force)addr ^
345 reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
347 if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK |
348 XEL_TSR_XMIT_ACTIVE_MASK)) != 0)
349 return -1; /* Buffers were full, return failure */
351 return -1; /* Buffer was full, return failure */
353 /* Write the frame to the buffer */
354 xemaclite_aligned_write(data, (u32 __force *)addr, byte_count);
356 xemaclite_writel((byte_count & XEL_TPLR_LENGTH_MASK),
357 addr + XEL_TPLR_OFFSET);
359 /* Update the Tx Status Register to indicate that there is a
360 * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which
361 * is used by the interrupt handler to check whether a frame
362 * has been transmitted
364 reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
365 reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK);
366 xemaclite_writel(reg_data, addr + XEL_TSR_OFFSET);
372 * xemaclite_recv_data - Receive a frame
373 * @drvdata: Pointer to the Emaclite device private data
374 * @data: Address where the data is to be received
375 * @maxlen: Maximum supported ethernet packet length
377 * This function is intended to be called from the interrupt context or
378 * with a wrapper which waits for the receive frame to be available.
380 * Return: Total number of bytes received
382 static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data, int maxlen)
385 u16 length, proto_type;
388 /* Determine the expected buffer address */
389 addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use);
391 /* Verify which buffer has valid data */
392 reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
394 if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
395 if (drvdata->rx_ping_pong != 0)
396 drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET;
398 /* The instance is out of sync, try other buffer if other
399 * buffer is configured, return 0 otherwise. If the instance is
400 * out of sync, do not update the 'next_rx_buf_to_use' since it
401 * will correct on subsequent calls
403 if (drvdata->rx_ping_pong != 0)
404 addr = (void __iomem __force *)((u32 __force)addr ^
407 return 0; /* No data was available */
409 /* Verify that buffer has valid data */
410 reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
411 if ((reg_data & XEL_RSR_RECV_DONE_MASK) !=
412 XEL_RSR_RECV_DONE_MASK)
413 return 0; /* No data was available */
416 /* Get the protocol type of the ethernet frame that arrived
418 proto_type = ((ntohl(xemaclite_readl(addr + XEL_HEADER_OFFSET +
419 XEL_RXBUFF_OFFSET)) >> XEL_HEADER_SHIFT) &
420 XEL_RPLR_LENGTH_MASK);
422 /* Check if received ethernet frame is a raw ethernet frame
423 * or an IP packet or an ARP packet
425 if (proto_type > ETH_DATA_LEN) {
427 if (proto_type == ETH_P_IP) {
428 length = ((ntohl(xemaclite_readl(addr +
429 XEL_HEADER_IP_LENGTH_OFFSET +
430 XEL_RXBUFF_OFFSET)) >>
432 XEL_RPLR_LENGTH_MASK);
433 length = min_t(u16, length, ETH_DATA_LEN);
434 length += ETH_HLEN + ETH_FCS_LEN;
436 } else if (proto_type == ETH_P_ARP)
437 length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN;
439 /* Field contains type other than IP or ARP, use max
440 * frame size and let user parse it
442 length = ETH_FRAME_LEN + ETH_FCS_LEN;
444 /* Use the length in the frame, plus the header and trailer */
445 length = proto_type + ETH_HLEN + ETH_FCS_LEN;
447 if (WARN_ON(length > maxlen))
450 /* Read from the EmacLite device */
451 xemaclite_aligned_read((u32 __force *)(addr + XEL_RXBUFF_OFFSET),
454 /* Acknowledge the frame */
455 reg_data = xemaclite_readl(addr + XEL_RSR_OFFSET);
456 reg_data &= ~XEL_RSR_RECV_DONE_MASK;
457 xemaclite_writel(reg_data, addr + XEL_RSR_OFFSET);
463 * xemaclite_update_address - Update the MAC address in the device
464 * @drvdata: Pointer to the Emaclite device private data
465 * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value)
467 * Tx must be idle and Rx should be idle for deterministic results.
468 * It is recommended that this function should be called after the
469 * initialization and before transmission of any packets from the device.
470 * The MAC address can be programmed using any of the two transmit
471 * buffers (if configured).
473 static void xemaclite_update_address(struct net_local *drvdata,
479 /* Determine the expected Tx buffer address */
480 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
482 xemaclite_aligned_write(address_ptr, (u32 __force *)addr, ETH_ALEN);
484 xemaclite_writel(ETH_ALEN, addr + XEL_TPLR_OFFSET);
486 /* Update the MAC address in the EmacLite */
487 reg_data = xemaclite_readl(addr + XEL_TSR_OFFSET);
488 xemaclite_writel(reg_data | XEL_TSR_PROG_MAC_ADDR, addr + XEL_TSR_OFFSET);
490 /* Wait for EmacLite to finish with the MAC address update */
491 while ((xemaclite_readl(addr + XEL_TSR_OFFSET) &
492 XEL_TSR_PROG_MAC_ADDR) != 0)
497 * xemaclite_set_mac_address - Set the MAC address for this device
498 * @dev: Pointer to the network device instance
499 * @address: Void pointer to the sockaddr structure
501 * This function copies the HW address from the sockaddr strucutre to the
502 * net_device structure and updates the address in HW.
504 * Return: Error if the net device is busy or 0 if the addr is set
507 static int xemaclite_set_mac_address(struct net_device *dev, void *address)
509 struct net_local *lp = netdev_priv(dev);
510 struct sockaddr *addr = address;
512 if (netif_running(dev))
515 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
516 xemaclite_update_address(lp, dev->dev_addr);
521 * xemaclite_tx_timeout - Callback for Tx Timeout
522 * @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)
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_kfree_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)
716 unsigned long end = jiffies + 2;
718 /* wait for the MDIO interface to not be busy or timeout
721 while (xemaclite_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET) &
722 XEL_MDIOCTRL_MDIOSTS_MASK) {
723 if (time_before_eq(end, jiffies)) {
733 * xemaclite_mdio_read - Read from a given MII management register
734 * @bus: the mii_bus struct
735 * @phy_id: the phy address
736 * @reg: register number to read from
738 * This function waits till the device is ready to accept a new MDIO
739 * request and then writes the phy address to the MDIO Address register
740 * and reads data from MDIO Read Data register, when its available.
742 * Return: Value read from the MII management register
744 static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg)
746 struct net_local *lp = bus->priv;
750 if (xemaclite_mdio_wait(lp))
753 /* Write the PHY address, register number and set the OP bit in the
754 * MDIO Address register. Set the Status bit in the MDIO Control
755 * register to start a MDIO read transaction.
757 ctrl_reg = xemaclite_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET);
758 xemaclite_writel(XEL_MDIOADDR_OP_MASK |
759 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg),
760 lp->base_addr + XEL_MDIOADDR_OFFSET);
761 xemaclite_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK,
762 lp->base_addr + XEL_MDIOCTRL_OFFSET);
764 if (xemaclite_mdio_wait(lp))
767 rc = xemaclite_readl(lp->base_addr + XEL_MDIORD_OFFSET);
769 dev_dbg(&lp->ndev->dev,
770 "%s(phy_id=%i, reg=%x) == %x\n", __func__,
777 * xemaclite_mdio_write - Write to a given MII management register
778 * @bus: the mii_bus struct
779 * @phy_id: the phy address
780 * @reg: register number to write to
781 * @val: value to write to the register number specified by reg
783 * This function waits till the device is ready to accept a new MDIO
784 * request and then writes the val to the MDIO Write Data register.
786 * Return: 0 upon success or a negative error upon failure
788 static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg,
791 struct net_local *lp = bus->priv;
794 dev_dbg(&lp->ndev->dev,
795 "%s(phy_id=%i, reg=%x, val=%x)\n", __func__,
798 if (xemaclite_mdio_wait(lp))
801 /* Write the PHY address, register number and clear the OP bit in the
802 * MDIO Address register and then write the value into the MDIO Write
803 * Data register. Finally, set the Status bit in the MDIO Control
804 * register to start a MDIO write transaction.
806 ctrl_reg = xemaclite_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET);
807 xemaclite_writel(~XEL_MDIOADDR_OP_MASK &
808 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg),
809 lp->base_addr + XEL_MDIOADDR_OFFSET);
810 xemaclite_writel(val, lp->base_addr + XEL_MDIOWR_OFFSET);
811 xemaclite_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK,
812 lp->base_addr + XEL_MDIOCTRL_OFFSET);
818 * xemaclite_mdio_setup - Register mii_bus for the Emaclite device
819 * @lp: Pointer to the Emaclite device private data
820 * @dev: Pointer to OF device structure
822 * This function enables MDIO bus in the Emaclite device and registers a
825 * Return: 0 upon success or a negative error upon failure
827 static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev)
832 struct device_node *np = of_get_parent(lp->phy_node);
833 struct device_node *npp;
835 /* Don't register the MDIO bus if the phy_node or its parent node
839 dev_err(dev, "Failed to register mdio bus.\n");
842 npp = of_get_parent(np);
844 of_address_to_resource(npp, 0, &res);
845 if (lp->ndev->mem_start != res.start) {
846 struct phy_device *phydev;
847 phydev = of_phy_find_device(lp->phy_node);
850 "MDIO of the phy is not registered yet\n");
852 put_device(&phydev->mdio.dev);
856 /* Enable the MDIO bus by asserting the enable bit in MDIO Control
859 xemaclite_writel(XEL_MDIOCTRL_MDIOEN_MASK,
860 lp->base_addr + XEL_MDIOCTRL_OFFSET);
862 bus = mdiobus_alloc();
864 dev_err(dev, "Failed to allocate mdiobus\n");
868 snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
869 (unsigned long long)res.start);
871 bus->name = "Xilinx Emaclite MDIO";
872 bus->read = xemaclite_mdio_read;
873 bus->write = xemaclite_mdio_write;
876 rc = of_mdiobus_register(bus, np);
878 dev_err(dev, "Failed to register mdio bus.\n");
892 * xemaclite_adjust_link - Link state callback for the Emaclite device
893 * @ndev: pointer to net_device struct
895 * There's nothing in the Emaclite device to be configured when the link
896 * state changes. We just print the status.
898 static void xemaclite_adjust_link(struct net_device *ndev)
900 struct net_local *lp = netdev_priv(ndev);
901 struct phy_device *phy = lp->phy_dev;
904 /* hash together the state values to decide if something has changed */
905 link_state = phy->speed | (phy->duplex << 1) | phy->link;
907 if (lp->last_link != link_state) {
908 lp->last_link = link_state;
909 phy_print_status(phy);
914 * xemaclite_open - Open the network device
915 * @dev: Pointer to the network device
917 * This function sets the MAC address, requests an IRQ and enables interrupts
918 * for the Emaclite device and starts the Tx queue.
919 * It also connects to the phy device, if MDIO is included in Emaclite device.
921 * Return: 0 on success. -ENODEV, if PHY cannot be connected.
922 * Non-zero error value on failure.
924 static int xemaclite_open(struct net_device *dev)
926 struct net_local *lp = netdev_priv(dev);
929 /* Just to be safe, stop the device first */
930 xemaclite_disable_interrupts(lp);
935 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
936 xemaclite_adjust_link, 0,
937 PHY_INTERFACE_MODE_MII);
939 dev_err(&lp->ndev->dev, "of_phy_connect() failed\n");
943 /* EmacLite doesn't support giga-bit speeds */
944 phy_set_max_speed(lp->phy_dev, SPEED_100);
946 /* Don't advertise 1000BASE-T Full/Half duplex speeds */
947 phy_write(lp->phy_dev, MII_CTRL1000, 0);
949 /* Advertise only 10 and 100mbps full/half duplex speeds */
950 phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL |
953 /* Restart auto negotiation */
954 bmcr = phy_read(lp->phy_dev, MII_BMCR);
955 bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
956 phy_write(lp->phy_dev, MII_BMCR, bmcr);
958 phy_start(lp->phy_dev);
961 /* Set the MAC address each time opened */
962 xemaclite_update_address(lp, dev->dev_addr);
965 retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev);
967 dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n",
970 phy_disconnect(lp->phy_dev);
976 /* Enable Interrupts */
977 xemaclite_enable_interrupts(lp);
979 /* We're ready to go */
980 netif_start_queue(dev);
986 * xemaclite_close - Close the network device
987 * @dev: Pointer to the network device
989 * This function stops the Tx queue, disables interrupts and frees the IRQ for
990 * the Emaclite device.
991 * It also disconnects the phy device associated with the Emaclite device.
995 static int xemaclite_close(struct net_device *dev)
997 struct net_local *lp = netdev_priv(dev);
999 netif_stop_queue(dev);
1000 xemaclite_disable_interrupts(lp);
1001 free_irq(dev->irq, dev);
1004 phy_disconnect(lp->phy_dev);
1011 * xemaclite_send - Transmit a frame
1012 * @orig_skb: Pointer to the socket buffer to be transmitted
1013 * @dev: Pointer to the network device
1015 * This function checks if the Tx buffer of the Emaclite device is free to send
1016 * data. If so, it fills the Tx buffer with data from socket buffer data,
1017 * updates the stats and frees the socket buffer. The Tx completion is signaled
1018 * by an interrupt. If the Tx buffer isn't free, then the socket buffer is
1019 * deferred and the Tx queue is stopped so that the deferred socket buffer can
1020 * be transmitted when the Emaclite device is free to transmit data.
1022 * Return: NETDEV_TX_OK, always.
1025 xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev)
1027 struct net_local *lp = netdev_priv(dev);
1028 struct sk_buff *new_skb;
1030 unsigned long flags;
1032 len = orig_skb->len;
1036 spin_lock_irqsave(&lp->reset_lock, flags);
1037 if (xemaclite_send_data(lp, (u8 *)new_skb->data, len) != 0) {
1038 /* If the Emaclite Tx buffer is busy, stop the Tx queue and
1039 * defer the skb for transmission during the ISR, after the
1040 * current transmission is complete
1042 netif_stop_queue(dev);
1043 lp->deferred_skb = new_skb;
1044 /* Take the time stamp now, since we can't do this in an ISR. */
1045 skb_tx_timestamp(new_skb);
1046 spin_unlock_irqrestore(&lp->reset_lock, flags);
1047 return NETDEV_TX_OK;
1049 spin_unlock_irqrestore(&lp->reset_lock, flags);
1051 skb_tx_timestamp(new_skb);
1053 dev->stats.tx_bytes += len;
1054 dev_consume_skb_any(new_skb);
1056 return NETDEV_TX_OK;
1060 * get_bool - Get a parameter from the OF device
1061 * @ofdev: Pointer to OF device structure
1062 * @s: Property to be retrieved
1064 * This function looks for a property in the device node and returns the value
1065 * of the property if its found or 0 if the property is not found.
1067 * Return: Value of the parameter if the parameter is found, or 0 otherwise
1069 static bool get_bool(struct platform_device *ofdev, const char *s)
1071 u32 *p = (u32 *)of_get_property(ofdev->dev.of_node, s, NULL);
1074 dev_warn(&ofdev->dev, "Parameter %s not found, defaulting to false\n", s);
1081 static const struct net_device_ops xemaclite_netdev_ops;
1084 * xemaclite_of_probe - Probe method for the Emaclite device.
1085 * @ofdev: Pointer to OF device structure
1087 * This function probes for the Emaclite device in the device tree.
1088 * It initializes the driver data structure and the hardware, sets the MAC
1089 * address and registers the network device.
1090 * It also registers a mii_bus for the Emaclite device, if MDIO is included
1093 * Return: 0, if the driver is bound to the Emaclite device, or
1094 * a negative error if there is failure.
1096 static int xemaclite_of_probe(struct platform_device *ofdev)
1098 struct resource *res;
1099 struct net_device *ndev = NULL;
1100 struct net_local *lp = NULL;
1101 struct device *dev = &ofdev->dev;
1102 const void *mac_address;
1106 dev_info(dev, "Device Tree Probing\n");
1108 /* Create an ethernet device instance */
1109 ndev = alloc_etherdev(sizeof(struct net_local));
1113 dev_set_drvdata(dev, ndev);
1114 SET_NETDEV_DEV(ndev, &ofdev->dev);
1116 lp = netdev_priv(ndev);
1119 /* Get IRQ for the device */
1120 res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
1122 dev_err(dev, "no IRQ found\n");
1127 ndev->irq = res->start;
1129 res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
1130 lp->base_addr = devm_ioremap_resource(&ofdev->dev, res);
1131 if (IS_ERR(lp->base_addr)) {
1132 rc = PTR_ERR(lp->base_addr);
1136 ndev->mem_start = res->start;
1137 ndev->mem_end = res->end;
1139 spin_lock_init(&lp->reset_lock);
1140 lp->next_tx_buf_to_use = 0x0;
1141 lp->next_rx_buf_to_use = 0x0;
1142 lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong");
1143 lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong");
1144 mac_address = of_get_mac_address(ofdev->dev.of_node);
1147 /* Set the MAC address. */
1148 memcpy(ndev->dev_addr, mac_address, ETH_ALEN);
1150 dev_warn(dev, "No MAC address found, using random\n");
1151 eth_hw_addr_random(ndev);
1154 /* Clear the Tx CSR's in case this is a restart */
1155 xemaclite_writel(0, lp->base_addr + XEL_TSR_OFFSET);
1156 xemaclite_writel(0, lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
1158 /* Set the MAC address in the EmacLite device */
1159 xemaclite_update_address(lp, ndev->dev_addr);
1161 lp->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
1162 xemaclite_mdio_setup(lp, &ofdev->dev);
1164 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
1166 ndev->netdev_ops = &xemaclite_netdev_ops;
1167 ndev->flags &= ~IFF_MULTICAST;
1168 ndev->watchdog_timeo = TX_TIMEOUT;
1170 /* Finally, register the device */
1171 rc = register_netdev(ndev);
1174 "Cannot register network device, aborting\n");
1179 "Xilinx EmacLite at 0x%08X mapped to 0x%08X, irq=%d\n",
1180 (unsigned int __force)ndev->mem_start,
1181 (unsigned int __force)lp->base_addr, ndev->irq);
1190 * xemaclite_of_remove - Unbind the driver from the Emaclite device.
1191 * @of_dev: Pointer to OF device structure
1193 * This function is called if a device is physically removed from the system or
1194 * if the driver module is being unloaded. It frees any resources allocated to
1197 * Return: 0, always.
1199 static int xemaclite_of_remove(struct platform_device *of_dev)
1201 struct net_device *ndev = platform_get_drvdata(of_dev);
1203 struct net_local *lp = netdev_priv(ndev);
1205 /* Un-register the mii_bus, if configured */
1207 mdiobus_unregister(lp->mii_bus);
1208 mdiobus_free(lp->mii_bus);
1212 unregister_netdev(ndev);
1214 of_node_put(lp->phy_node);
1215 lp->phy_node = NULL;
1222 #ifdef CONFIG_NET_POLL_CONTROLLER
1224 xemaclite_poll_controller(struct net_device *ndev)
1226 disable_irq(ndev->irq);
1227 xemaclite_interrupt(ndev->irq, ndev);
1228 enable_irq(ndev->irq);
1232 static const struct net_device_ops xemaclite_netdev_ops = {
1233 .ndo_open = xemaclite_open,
1234 .ndo_stop = xemaclite_close,
1235 .ndo_start_xmit = xemaclite_send,
1236 .ndo_set_mac_address = xemaclite_set_mac_address,
1237 .ndo_tx_timeout = xemaclite_tx_timeout,
1238 #ifdef CONFIG_NET_POLL_CONTROLLER
1239 .ndo_poll_controller = xemaclite_poll_controller,
1243 /* Match table for OF platform binding */
1244 static const struct of_device_id xemaclite_of_match[] = {
1245 { .compatible = "xlnx,opb-ethernetlite-1.01.a", },
1246 { .compatible = "xlnx,opb-ethernetlite-1.01.b", },
1247 { .compatible = "xlnx,xps-ethernetlite-1.00.a", },
1248 { .compatible = "xlnx,xps-ethernetlite-2.00.a", },
1249 { .compatible = "xlnx,xps-ethernetlite-2.01.a", },
1250 { .compatible = "xlnx,xps-ethernetlite-3.00.a", },
1251 { /* end of list */ },
1253 MODULE_DEVICE_TABLE(of, xemaclite_of_match);
1255 static struct platform_driver xemaclite_of_driver = {
1257 .name = DRIVER_NAME,
1258 .of_match_table = xemaclite_of_match,
1260 .probe = xemaclite_of_probe,
1261 .remove = xemaclite_of_remove,
1264 module_platform_driver(xemaclite_of_driver);
1266 MODULE_AUTHOR("Xilinx, Inc.");
1267 MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver");
1268 MODULE_LICENSE("GPL");