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/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/of_net.h>
28 #include <linux/phy.h>
29 #include <linux/interrupt.h>
31 #define DRIVER_NAME "xilinx_emaclite"
33 /* Register offsets for the EmacLite Core */
34 #define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */
35 #define XEL_MDIOADDR_OFFSET 0x07E4 /* MDIO Address Register */
36 #define XEL_MDIOWR_OFFSET 0x07E8 /* MDIO Write Data Register */
37 #define XEL_MDIORD_OFFSET 0x07EC /* MDIO Read Data Register */
38 #define XEL_MDIOCTRL_OFFSET 0x07F0 /* MDIO Control Register */
39 #define XEL_GIER_OFFSET 0x07F8 /* GIE Register */
40 #define XEL_TSR_OFFSET 0x07FC /* Tx status */
41 #define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */
43 #define XEL_RXBUFF_OFFSET 0x1000 /* Receive Buffer */
44 #define XEL_RPLR_OFFSET 0x100C /* Rx packet length */
45 #define XEL_RSR_OFFSET 0x17FC /* Rx status */
47 #define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */
49 /* MDIO Address Register Bit Masks */
50 #define XEL_MDIOADDR_REGADR_MASK 0x0000001F /* Register Address */
51 #define XEL_MDIOADDR_PHYADR_MASK 0x000003E0 /* PHY Address */
52 #define XEL_MDIOADDR_PHYADR_SHIFT 5
53 #define XEL_MDIOADDR_OP_MASK 0x00000400 /* RD/WR Operation */
55 /* MDIO Write Data Register Bit Masks */
56 #define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */
58 /* MDIO Read Data Register Bit Masks */
59 #define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */
61 /* MDIO Control Register Bit Masks */
62 #define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001 /* MDIO Status Mask */
63 #define XEL_MDIOCTRL_MDIOEN_MASK 0x00000008 /* MDIO Enable */
65 /* Global Interrupt Enable Register (GIER) Bit Masks */
66 #define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */
68 /* Transmit Status Register (TSR) Bit Masks */
69 #define XEL_TSR_XMIT_BUSY_MASK 0x00000001 /* Tx complete */
70 #define XEL_TSR_PROGRAM_MASK 0x00000002 /* Program the MAC address */
71 #define XEL_TSR_XMIT_IE_MASK 0x00000008 /* Tx interrupt enable bit */
72 #define XEL_TSR_XMIT_ACTIVE_MASK 0x80000000 /* Buffer is active, SW bit
73 * 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 * struct net_local - Our private per device data
106 * @ndev: instance of the network device
107 * @tx_ping_pong: indicates whether Tx Pong buffer is configured in HW
108 * @rx_ping_pong: indicates whether Rx Pong buffer is configured in HW
109 * @next_tx_buf_to_use: next Tx buffer to write to
110 * @next_rx_buf_to_use: next Rx buffer to read from
111 * @base_addr: base address of the Emaclite device
112 * @reset_lock: lock used for synchronization
113 * @deferred_skb: holds an skb (for transmission at a later time) when the
114 * Tx buffer is not free
115 * @phy_dev: pointer to the PHY device
116 * @phy_node: pointer to the PHY device node
117 * @mii_bus: pointer to the MII bus
118 * @mdio_irqs: IRQs table for MDIO bus
119 * @last_link: last link status
120 * @has_mdio: indicates whether MDIO is included in the HW
124 struct net_device *ndev;
128 u32 next_tx_buf_to_use;
129 u32 next_rx_buf_to_use;
130 void __iomem *base_addr;
132 spinlock_t reset_lock;
133 struct sk_buff *deferred_skb;
135 struct phy_device *phy_dev;
136 struct device_node *phy_node;
138 struct mii_bus *mii_bus;
139 int mdio_irqs[PHY_MAX_ADDR];
146 /*************************/
147 /* EmacLite driver calls */
148 /*************************/
151 * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device
152 * @drvdata: Pointer to the Emaclite device private data
154 * This function enables the Tx and Rx interrupts for the Emaclite device along
155 * with the Global Interrupt Enable.
157 static void xemaclite_enable_interrupts(struct net_local *drvdata)
161 /* Enable the Tx interrupts for the first Buffer */
162 reg_data = __raw_readl(drvdata->base_addr + XEL_TSR_OFFSET);
163 __raw_writel(reg_data | XEL_TSR_XMIT_IE_MASK,
164 drvdata->base_addr + XEL_TSR_OFFSET);
166 /* Enable the Tx interrupts for the second Buffer if
167 * configured in HW */
168 if (drvdata->tx_ping_pong != 0) {
169 reg_data = __raw_readl(drvdata->base_addr +
170 XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
171 __raw_writel(reg_data | XEL_TSR_XMIT_IE_MASK,
172 drvdata->base_addr + XEL_BUFFER_OFFSET +
176 /* Enable the Rx interrupts for the first buffer */
177 __raw_writel(XEL_RSR_RECV_IE_MASK, drvdata->base_addr + XEL_RSR_OFFSET);
179 /* Enable the Rx interrupts for the second Buffer if
180 * configured in HW */
181 if (drvdata->rx_ping_pong != 0) {
182 __raw_writel(XEL_RSR_RECV_IE_MASK, drvdata->base_addr +
183 XEL_BUFFER_OFFSET + XEL_RSR_OFFSET);
186 /* Enable the Global Interrupt Enable */
187 __raw_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET);
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 __raw_writel(XEL_GIER_GIE_MASK, drvdata->base_addr + XEL_GIER_OFFSET);
204 /* Disable the Tx interrupts for the first buffer */
205 reg_data = __raw_readl(drvdata->base_addr + XEL_TSR_OFFSET);
206 __raw_writel(reg_data & (~XEL_TSR_XMIT_IE_MASK),
207 drvdata->base_addr + XEL_TSR_OFFSET);
209 /* Disable the Tx interrupts for the second Buffer
210 * if configured in HW */
211 if (drvdata->tx_ping_pong != 0) {
212 reg_data = __raw_readl(drvdata->base_addr + XEL_BUFFER_OFFSET +
214 __raw_writel(reg_data & (~XEL_TSR_XMIT_IE_MASK),
215 drvdata->base_addr + XEL_BUFFER_OFFSET +
219 /* Disable the Rx interrupts for the first buffer */
220 reg_data = __raw_readl(drvdata->base_addr + XEL_RSR_OFFSET);
221 __raw_writel(reg_data & (~XEL_RSR_RECV_IE_MASK),
222 drvdata->base_addr + XEL_RSR_OFFSET);
224 /* Disable the Rx interrupts for the second buffer
225 * if configured in HW */
226 if (drvdata->rx_ping_pong != 0) {
228 reg_data = __raw_readl(drvdata->base_addr + XEL_BUFFER_OFFSET +
230 __raw_writel(reg_data & (~XEL_RSR_RECV_IE_MASK),
231 drvdata->base_addr + XEL_BUFFER_OFFSET +
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 = src_ptr;
256 for (; length > 3; length -= 4) {
257 to_u16_ptr = (u16 *)&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 = __raw_readl(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 = __raw_readl(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 __raw_writel((byte_count & XEL_TPLR_LENGTH_MASK),
377 addr + XEL_TPLR_OFFSET);
379 /* Update the Tx Status Register to indicate that there is a
380 * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which
381 * is used by the interrupt handler to check whether a frame
382 * has been transmitted */
383 reg_data = __raw_readl(addr + XEL_TSR_OFFSET);
384 reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK);
385 __raw_writel(reg_data, addr + XEL_TSR_OFFSET);
391 * xemaclite_recv_data - Receive a frame
392 * @drvdata: Pointer to the Emaclite device private data
393 * @data: Address where the data is to be received
395 * This function is intended to be called from the interrupt context or
396 * with a wrapper which waits for the receive frame to be available.
398 * Return: Total number of bytes received
400 static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data)
403 u16 length, proto_type;
406 /* Determine the expected buffer address */
407 addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use);
409 /* Verify which buffer has valid data */
410 reg_data = __raw_readl(addr + XEL_RSR_OFFSET);
412 if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) {
413 if (drvdata->rx_ping_pong != 0)
414 drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET;
416 /* The instance is out of sync, try other buffer if other
417 * buffer is configured, return 0 otherwise. If the instance is
418 * out of sync, do not update the 'next_rx_buf_to_use' since it
419 * will correct on subsequent calls */
420 if (drvdata->rx_ping_pong != 0)
421 addr = (void __iomem __force *)((u32 __force)addr ^
424 return 0; /* No data was available */
426 /* Verify that buffer has valid data */
427 reg_data = __raw_readl(addr + XEL_RSR_OFFSET);
428 if ((reg_data & XEL_RSR_RECV_DONE_MASK) !=
429 XEL_RSR_RECV_DONE_MASK)
430 return 0; /* No data was available */
433 /* Get the protocol type of the ethernet frame that arrived */
434 proto_type = ((ntohl(__raw_readl(addr + XEL_HEADER_OFFSET +
435 XEL_RXBUFF_OFFSET)) >> XEL_HEADER_SHIFT) &
436 XEL_RPLR_LENGTH_MASK);
438 /* Check if received ethernet frame is a raw ethernet frame
439 * or an IP packet or an ARP packet */
440 if (proto_type > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
442 if (proto_type == ETH_P_IP) {
443 length = ((ntohl(__raw_readl(addr +
444 XEL_HEADER_IP_LENGTH_OFFSET +
445 XEL_RXBUFF_OFFSET)) >>
447 XEL_RPLR_LENGTH_MASK);
448 length += ETH_HLEN + ETH_FCS_LEN;
450 } else if (proto_type == ETH_P_ARP)
451 length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN;
453 /* Field contains type other than IP or ARP, use max
454 * frame size and let user parse it */
455 length = ETH_FRAME_LEN + ETH_FCS_LEN;
457 /* Use the length in the frame, plus the header and trailer */
458 length = proto_type + ETH_HLEN + ETH_FCS_LEN;
460 /* Read from the EmacLite device */
461 xemaclite_aligned_read((u32 __force *) (addr + XEL_RXBUFF_OFFSET),
464 /* Acknowledge the frame */
465 reg_data = __raw_readl(addr + XEL_RSR_OFFSET);
466 reg_data &= ~XEL_RSR_RECV_DONE_MASK;
467 __raw_writel(reg_data, addr + XEL_RSR_OFFSET);
473 * xemaclite_update_address - Update the MAC address in the device
474 * @drvdata: Pointer to the Emaclite device private data
475 * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value)
477 * Tx must be idle and Rx should be idle for deterministic results.
478 * It is recommended that this function should be called after the
479 * initialization and before transmission of any packets from the device.
480 * The MAC address can be programmed using any of the two transmit
481 * buffers (if configured).
483 static void xemaclite_update_address(struct net_local *drvdata,
489 /* Determine the expected Tx buffer address */
490 addr = drvdata->base_addr + drvdata->next_tx_buf_to_use;
492 xemaclite_aligned_write(address_ptr, (u32 __force *) addr, ETH_ALEN);
494 __raw_writel(ETH_ALEN, addr + XEL_TPLR_OFFSET);
496 /* Update the MAC address in the EmacLite */
497 reg_data = __raw_readl(addr + XEL_TSR_OFFSET);
498 __raw_writel(reg_data | XEL_TSR_PROG_MAC_ADDR, addr + XEL_TSR_OFFSET);
500 /* Wait for EmacLite to finish with the MAC address update */
501 while ((__raw_readl(addr + XEL_TSR_OFFSET) &
502 XEL_TSR_PROG_MAC_ADDR) != 0)
507 * xemaclite_set_mac_address - Set the MAC address for this device
508 * @dev: Pointer to the network device instance
509 * @addr: Void pointer to the sockaddr structure
511 * This function copies the HW address from the sockaddr strucutre to the
512 * net_device structure and updates the address in HW.
514 * Return: Error if the net device is busy or 0 if the addr is set
517 static int xemaclite_set_mac_address(struct net_device *dev, void *address)
519 struct net_local *lp = netdev_priv(dev);
520 struct sockaddr *addr = address;
522 if (netif_running(dev))
525 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
526 xemaclite_update_address(lp, dev->dev_addr);
531 * xemaclite_tx_timeout - Callback for Tx Timeout
532 * @dev: Pointer to the network device
534 * This function is called when Tx time out occurs for Emaclite device.
536 static void xemaclite_tx_timeout(struct net_device *dev)
538 struct net_local *lp = netdev_priv(dev);
541 dev_err(&lp->ndev->dev, "Exceeded transmit timeout of %lu ms\n",
542 TX_TIMEOUT * 1000UL / HZ);
544 dev->stats.tx_errors++;
546 /* Reset the device */
547 spin_lock_irqsave(&lp->reset_lock, flags);
549 /* Shouldn't really be necessary, but shouldn't hurt */
550 netif_stop_queue(dev);
552 xemaclite_disable_interrupts(lp);
553 xemaclite_enable_interrupts(lp);
555 if (lp->deferred_skb) {
556 dev_kfree_skb(lp->deferred_skb);
557 lp->deferred_skb = NULL;
558 dev->stats.tx_errors++;
561 /* To exclude tx timeout */
562 dev->trans_start = jiffies; /* prevent tx timeout */
564 /* We're all ready to go. Start the queue */
565 netif_wake_queue(dev);
566 spin_unlock_irqrestore(&lp->reset_lock, flags);
569 /**********************/
570 /* Interrupt Handlers */
571 /**********************/
574 * xemaclite_tx_handler - Interrupt handler for frames sent
575 * @dev: Pointer to the network device
577 * This function updates the number of packets transmitted and handles the
578 * deferred skb, if there is one.
580 static void xemaclite_tx_handler(struct net_device *dev)
582 struct net_local *lp = netdev_priv(dev);
584 dev->stats.tx_packets++;
585 if (lp->deferred_skb) {
586 if (xemaclite_send_data(lp,
587 (u8 *) lp->deferred_skb->data,
588 lp->deferred_skb->len) != 0)
591 dev->stats.tx_bytes += lp->deferred_skb->len;
592 dev_kfree_skb_irq(lp->deferred_skb);
593 lp->deferred_skb = NULL;
594 dev->trans_start = jiffies; /* prevent tx timeout */
595 netif_wake_queue(dev);
601 * xemaclite_rx_handler- Interrupt handler for frames received
602 * @dev: Pointer to the network device
604 * This function allocates memory for a socket buffer, fills it with data
605 * received and hands it over to the TCP/IP stack.
607 static void xemaclite_rx_handler(struct net_device *dev)
609 struct net_local *lp = netdev_priv(dev);
614 len = ETH_FRAME_LEN + ETH_FCS_LEN;
615 skb = netdev_alloc_skb(dev, len + ALIGNMENT);
617 /* Couldn't get memory. */
618 dev->stats.rx_dropped++;
619 dev_err(&lp->ndev->dev, "Could not allocate receive buffer\n");
624 * A new skb should have the data halfword aligned, but this code is
625 * here just in case that isn't true. Calculate how many
626 * bytes we should reserve to get the data to start on a word
628 align = BUFFER_ALIGN(skb->data);
630 skb_reserve(skb, align);
634 len = xemaclite_recv_data(lp, (u8 *) skb->data);
637 dev->stats.rx_errors++;
638 dev_kfree_skb_irq(skb);
642 skb_put(skb, len); /* Tell the skb how much data we got */
644 skb->protocol = eth_type_trans(skb, dev);
645 skb_checksum_none_assert(skb);
647 dev->stats.rx_packets++;
648 dev->stats.rx_bytes += len;
650 if (!skb_defer_rx_timestamp(skb))
651 netif_rx(skb); /* Send the packet upstream */
655 * xemaclite_interrupt - Interrupt handler for this driver
656 * @irq: Irq of the Emaclite device
657 * @dev_id: Void pointer to the network device instance used as callback
660 * This function handles the Tx and Rx interrupts of the EmacLite device.
662 static irqreturn_t xemaclite_interrupt(int irq, void *dev_id)
664 bool tx_complete = false;
665 struct net_device *dev = dev_id;
666 struct net_local *lp = netdev_priv(dev);
667 void __iomem *base_addr = lp->base_addr;
670 /* Check if there is Rx Data available */
671 if ((__raw_readl(base_addr + XEL_RSR_OFFSET) &
672 XEL_RSR_RECV_DONE_MASK) ||
673 (__raw_readl(base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET)
674 & XEL_RSR_RECV_DONE_MASK))
676 xemaclite_rx_handler(dev);
678 /* Check if the Transmission for the first buffer is completed */
679 tx_status = __raw_readl(base_addr + XEL_TSR_OFFSET);
680 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
681 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
683 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
684 __raw_writel(tx_status, base_addr + XEL_TSR_OFFSET);
689 /* Check if the Transmission for the second buffer is completed */
690 tx_status = __raw_readl(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
691 if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) &&
692 (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) {
694 tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK;
695 __raw_writel(tx_status, base_addr + XEL_BUFFER_OFFSET +
701 /* If there was a Tx interrupt, call the Tx Handler */
702 if (tx_complete != 0)
703 xemaclite_tx_handler(dev);
708 /**********************/
709 /* MDIO Bus functions */
710 /**********************/
713 * xemaclite_mdio_wait - Wait for the MDIO to be ready to use
714 * @lp: Pointer to the Emaclite device private data
716 * This function waits till the device is ready to accept a new MDIO
719 * Return: 0 for success or ETIMEDOUT for a timeout
722 static int xemaclite_mdio_wait(struct net_local *lp)
724 long end = jiffies + 2;
726 /* wait for the MDIO interface to not be busy or timeout
729 while (__raw_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET) &
730 XEL_MDIOCTRL_MDIOSTS_MASK) {
731 if (end - jiffies <= 0) {
741 * xemaclite_mdio_read - Read from a given MII management register
742 * @bus: the mii_bus struct
743 * @phy_id: the phy address
744 * @reg: register number to read from
746 * This function waits till the device is ready to accept a new MDIO
747 * request and then writes the phy address to the MDIO Address register
748 * and reads data from MDIO Read Data register, when its available.
750 * Return: Value read from the MII management register
752 static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg)
754 struct net_local *lp = bus->priv;
758 if (xemaclite_mdio_wait(lp))
761 /* Write the PHY address, register number and set the OP bit in the
762 * MDIO Address register. Set the Status bit in the MDIO Control
763 * register to start a MDIO read transaction.
765 ctrl_reg = __raw_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET);
766 __raw_writel(XEL_MDIOADDR_OP_MASK |
767 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg),
768 lp->base_addr + XEL_MDIOADDR_OFFSET);
769 __raw_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK,
770 lp->base_addr + XEL_MDIOCTRL_OFFSET);
772 if (xemaclite_mdio_wait(lp))
775 rc = __raw_readl(lp->base_addr + XEL_MDIORD_OFFSET);
777 dev_dbg(&lp->ndev->dev,
778 "xemaclite_mdio_read(phy_id=%i, reg=%x) == %x\n",
785 * xemaclite_mdio_write - Write to a given MII management register
786 * @bus: the mii_bus struct
787 * @phy_id: the phy address
788 * @reg: register number to write to
789 * @val: value to write to the register number specified by reg
791 * This function waits till the device is ready to accept a new MDIO
792 * request and then writes the val to the MDIO Write Data register.
794 static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg,
797 struct net_local *lp = bus->priv;
800 dev_dbg(&lp->ndev->dev,
801 "xemaclite_mdio_write(phy_id=%i, reg=%x, val=%x)\n",
804 if (xemaclite_mdio_wait(lp))
807 /* Write the PHY address, register number and clear the OP bit in the
808 * MDIO Address register and then write the value into the MDIO Write
809 * Data register. Finally, set the Status bit in the MDIO Control
810 * register to start a MDIO write transaction.
812 ctrl_reg = __raw_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET);
813 __raw_writel(~XEL_MDIOADDR_OP_MASK &
814 ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg),
815 lp->base_addr + XEL_MDIOADDR_OFFSET);
816 __raw_writel(val, lp->base_addr + XEL_MDIOWR_OFFSET);
817 __raw_writel(ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK,
818 lp->base_addr + XEL_MDIOCTRL_OFFSET);
824 * xemaclite_mdio_reset - Reset the mdio bus.
825 * @bus: Pointer to the MII bus
827 * This function is required(?) as per Documentation/networking/phy.txt.
828 * There is no reset in this device; this function always returns 0.
830 static int xemaclite_mdio_reset(struct mii_bus *bus)
836 * xemaclite_mdio_setup - Register mii_bus for the Emaclite device
837 * @lp: Pointer to the Emaclite device private data
838 * @ofdev: Pointer to OF device structure
840 * This function enables MDIO bus in the Emaclite device and registers a
843 * Return: 0 upon success or a negative error upon failure
845 static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev)
850 struct device_node *np = of_get_parent(lp->phy_node);
851 struct device_node *npp;
853 /* Don't register the MDIO bus if the phy_node or its parent node
857 dev_err(dev, "Failed to register mdio bus.\n");
860 npp = of_get_parent(np);
862 of_address_to_resource(npp, 0, &res);
863 if (lp->ndev->mem_start != res.start) {
864 struct phy_device *phydev;
865 phydev = of_phy_find_device(lp->phy_node);
868 "MDIO of the phy is not registered yet\n");
872 /* Enable the MDIO bus by asserting the enable bit in MDIO Control
875 __raw_writel(XEL_MDIOCTRL_MDIOEN_MASK,
876 lp->base_addr + XEL_MDIOCTRL_OFFSET);
878 bus = mdiobus_alloc();
880 dev_err(dev, "Failed to allocate mdiobus\n");
884 snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx",
885 (unsigned long long)res.start);
887 bus->name = "Xilinx Emaclite MDIO";
888 bus->read = xemaclite_mdio_read;
889 bus->write = xemaclite_mdio_write;
890 bus->reset = xemaclite_mdio_reset;
892 bus->irq = lp->mdio_irqs; /* preallocated IRQ table */
896 rc = of_mdiobus_register(bus, np);
898 dev_err(dev, "Failed to register mdio bus.\n");
910 * xemaclite_adjust_link - Link state callback for the Emaclite device
911 * @ndev: pointer to net_device struct
913 * There's nothing in the Emaclite device to be configured when the link
914 * state changes. We just print the status.
916 static void xemaclite_adjust_link(struct net_device *ndev)
918 struct net_local *lp = netdev_priv(ndev);
919 struct phy_device *phy = lp->phy_dev;
922 /* hash together the state values to decide if something has changed */
923 link_state = phy->speed | (phy->duplex << 1) | phy->link;
925 if (lp->last_link != link_state) {
926 lp->last_link = link_state;
927 phy_print_status(phy);
932 * xemaclite_open - Open the network device
933 * @dev: Pointer to the network device
935 * This function sets the MAC address, requests an IRQ and enables interrupts
936 * for the Emaclite device and starts the Tx queue.
937 * It also connects to the phy device, if MDIO is included in Emaclite device.
939 static int xemaclite_open(struct net_device *dev)
941 struct net_local *lp = netdev_priv(dev);
944 /* Just to be safe, stop the device first */
945 xemaclite_disable_interrupts(lp);
950 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
951 xemaclite_adjust_link, 0,
952 PHY_INTERFACE_MODE_MII);
954 dev_err(&lp->ndev->dev, "of_phy_connect() failed\n");
958 /* EmacLite doesn't support giga-bit speeds */
959 lp->phy_dev->supported &= (PHY_BASIC_FEATURES);
960 lp->phy_dev->advertising = lp->phy_dev->supported;
962 /* Don't advertise 1000BASE-T Full/Half duplex speeds */
963 phy_write(lp->phy_dev, MII_CTRL1000, 0);
965 /* Advertise only 10 and 100mbps full/half duplex speeds */
966 phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL |
969 /* Restart auto negotiation */
970 bmcr = phy_read(lp->phy_dev, MII_BMCR);
971 bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
972 phy_write(lp->phy_dev, MII_BMCR, bmcr);
974 phy_start(lp->phy_dev);
977 /* Set the MAC address each time opened */
978 xemaclite_update_address(lp, dev->dev_addr);
981 retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev);
983 dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n",
986 phy_disconnect(lp->phy_dev);
992 /* Enable Interrupts */
993 xemaclite_enable_interrupts(lp);
995 /* We're ready to go */
996 netif_start_queue(dev);
1002 * xemaclite_close - Close the network device
1003 * @dev: Pointer to the network device
1005 * This function stops the Tx queue, disables interrupts and frees the IRQ for
1006 * the Emaclite device.
1007 * It also disconnects the phy device associated with the Emaclite device.
1009 static int xemaclite_close(struct net_device *dev)
1011 struct net_local *lp = netdev_priv(dev);
1013 netif_stop_queue(dev);
1014 xemaclite_disable_interrupts(lp);
1015 free_irq(dev->irq, dev);
1018 phy_disconnect(lp->phy_dev);
1025 * xemaclite_send - Transmit a frame
1026 * @orig_skb: Pointer to the socket buffer to be transmitted
1027 * @dev: Pointer to the network device
1029 * This function checks if the Tx buffer of the Emaclite device is free to send
1030 * data. If so, it fills the Tx buffer with data from socket buffer data,
1031 * updates the stats and frees the socket buffer. The Tx completion is signaled
1032 * by an interrupt. If the Tx buffer isn't free, then the socket buffer is
1033 * deferred and the Tx queue is stopped so that the deferred socket buffer can
1034 * be transmitted when the Emaclite device is free to transmit data.
1036 * Return: 0, always.
1038 static int xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev)
1040 struct net_local *lp = netdev_priv(dev);
1041 struct sk_buff *new_skb;
1043 unsigned long flags;
1045 len = orig_skb->len;
1049 spin_lock_irqsave(&lp->reset_lock, flags);
1050 if (xemaclite_send_data(lp, (u8 *) new_skb->data, len) != 0) {
1051 /* If the Emaclite Tx buffer is busy, stop the Tx queue and
1052 * defer the skb for transmission during the ISR, after the
1053 * current transmission is complete */
1054 netif_stop_queue(dev);
1055 lp->deferred_skb = new_skb;
1056 /* Take the time stamp now, since we can't do this in an ISR. */
1057 skb_tx_timestamp(new_skb);
1058 spin_unlock_irqrestore(&lp->reset_lock, flags);
1061 spin_unlock_irqrestore(&lp->reset_lock, flags);
1063 skb_tx_timestamp(new_skb);
1065 dev->stats.tx_bytes += len;
1066 dev_kfree_skb(new_skb);
1072 * xemaclite_remove_ndev - Free the network device
1073 * @ndev: Pointer to the network device to be freed
1075 * This function un maps the IO region of the Emaclite device and frees the net
1078 static void xemaclite_remove_ndev(struct net_device *ndev,
1079 struct platform_device *pdev)
1082 struct net_local *lp = netdev_priv(ndev);
1085 devm_iounmap(&pdev->dev, lp->base_addr);
1091 * get_bool - Get a parameter from the OF device
1092 * @ofdev: Pointer to OF device structure
1093 * @s: Property to be retrieved
1095 * This function looks for a property in the device node and returns the value
1096 * of the property if its found or 0 if the property is not found.
1098 * Return: Value of the parameter if the parameter is found, or 0 otherwise
1100 static bool get_bool(struct platform_device *ofdev, const char *s)
1102 u32 *p = (u32 *)of_get_property(ofdev->dev.of_node, s, NULL);
1107 dev_warn(&ofdev->dev, "Parameter %s not found,"
1108 "defaulting to false\n", s);
1113 static struct net_device_ops xemaclite_netdev_ops;
1116 * xemaclite_of_probe - Probe method for the Emaclite device.
1117 * @ofdev: Pointer to OF device structure
1118 * @match: Pointer to the structure used for matching a device
1120 * This function probes for the Emaclite device in the device tree.
1121 * It initializes the driver data structure and the hardware, sets the MAC
1122 * address and registers the network device.
1123 * It also registers a mii_bus for the Emaclite device, if MDIO is included
1126 * Return: 0, if the driver is bound to the Emaclite device, or
1127 * a negative error if there is failure.
1129 static int xemaclite_of_probe(struct platform_device *ofdev)
1131 struct resource *res;
1132 struct net_device *ndev = NULL;
1133 struct net_local *lp = NULL;
1134 struct device *dev = &ofdev->dev;
1135 const void *mac_address;
1139 dev_info(dev, "Device Tree Probing\n");
1141 /* Create an ethernet device instance */
1142 ndev = alloc_etherdev(sizeof(struct net_local));
1146 dev_set_drvdata(dev, ndev);
1147 SET_NETDEV_DEV(ndev, &ofdev->dev);
1149 lp = netdev_priv(ndev);
1152 /* Get IRQ for the device */
1153 res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
1155 dev_err(dev, "no IRQ found\n");
1159 ndev->irq = res->start;
1161 res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
1162 lp->base_addr = devm_ioremap_resource(&ofdev->dev, res);
1163 if (IS_ERR(lp->base_addr)) {
1164 rc = PTR_ERR(lp->base_addr);
1168 ndev->mem_start = res->start;
1169 ndev->mem_end = res->end;
1171 spin_lock_init(&lp->reset_lock);
1172 lp->next_tx_buf_to_use = 0x0;
1173 lp->next_rx_buf_to_use = 0x0;
1174 lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong");
1175 lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong");
1176 mac_address = of_get_mac_address(ofdev->dev.of_node);
1179 /* Set the MAC address. */
1180 memcpy(ndev->dev_addr, mac_address, 6);
1182 dev_warn(dev, "No MAC address found\n");
1184 /* Clear the Tx CSR's in case this is a restart */
1185 __raw_writel(0, lp->base_addr + XEL_TSR_OFFSET);
1186 __raw_writel(0, lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET);
1188 /* Set the MAC address in the EmacLite device */
1189 xemaclite_update_address(lp, ndev->dev_addr);
1191 lp->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
1192 rc = xemaclite_mdio_setup(lp, &ofdev->dev);
1194 dev_warn(&ofdev->dev, "error registering MDIO bus\n");
1196 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
1198 ndev->netdev_ops = &xemaclite_netdev_ops;
1199 ndev->flags &= ~IFF_MULTICAST;
1200 ndev->watchdog_timeo = TX_TIMEOUT;
1202 /* Finally, register the device */
1203 rc = register_netdev(ndev);
1206 "Cannot register network device, aborting\n");
1211 "Xilinx EmacLite at 0x%08X mapped to 0x%08X, irq=%d\n",
1212 (unsigned int __force)ndev->mem_start,
1213 (unsigned int __force)lp->base_addr, ndev->irq);
1217 xemaclite_remove_ndev(ndev, ofdev);
1222 * xemaclite_of_remove - Unbind the driver from the Emaclite device.
1223 * @of_dev: Pointer to OF device structure
1225 * This function is called if a device is physically removed from the system or
1226 * if the driver module is being unloaded. It frees any resources allocated to
1229 * Return: 0, always.
1231 static int xemaclite_of_remove(struct platform_device *of_dev)
1233 struct device *dev = &of_dev->dev;
1234 struct net_device *ndev = dev_get_drvdata(dev);
1236 struct net_local *lp = netdev_priv(ndev);
1238 /* Un-register the mii_bus, if configured */
1240 mdiobus_unregister(lp->mii_bus);
1241 kfree(lp->mii_bus->irq);
1242 mdiobus_free(lp->mii_bus);
1246 unregister_netdev(ndev);
1249 of_node_put(lp->phy_node);
1250 lp->phy_node = NULL;
1252 xemaclite_remove_ndev(ndev, of_dev);
1253 dev_set_drvdata(dev, NULL);
1258 #ifdef CONFIG_NET_POLL_CONTROLLER
1260 xemaclite_poll_controller(struct net_device *ndev)
1262 disable_irq(ndev->irq);
1263 xemaclite_interrupt(ndev->irq, ndev);
1264 enable_irq(ndev->irq);
1268 static struct net_device_ops xemaclite_netdev_ops = {
1269 .ndo_open = xemaclite_open,
1270 .ndo_stop = xemaclite_close,
1271 .ndo_start_xmit = xemaclite_send,
1272 .ndo_set_mac_address = xemaclite_set_mac_address,
1273 .ndo_tx_timeout = xemaclite_tx_timeout,
1274 #ifdef CONFIG_NET_POLL_CONTROLLER
1275 .ndo_poll_controller = xemaclite_poll_controller,
1279 /* Match table for OF platform binding */
1280 static struct of_device_id xemaclite_of_match[] = {
1281 { .compatible = "xlnx,opb-ethernetlite-1.01.a", },
1282 { .compatible = "xlnx,opb-ethernetlite-1.01.b", },
1283 { .compatible = "xlnx,xps-ethernetlite-1.00.a", },
1284 { .compatible = "xlnx,xps-ethernetlite-2.00.a", },
1285 { .compatible = "xlnx,xps-ethernetlite-2.01.a", },
1286 { .compatible = "xlnx,xps-ethernetlite-3.00.a", },
1287 { /* end of list */ },
1289 MODULE_DEVICE_TABLE(of, xemaclite_of_match);
1291 static struct platform_driver xemaclite_of_driver = {
1293 .name = DRIVER_NAME,
1294 .owner = THIS_MODULE,
1295 .of_match_table = xemaclite_of_match,
1297 .probe = xemaclite_of_probe,
1298 .remove = xemaclite_of_remove,
1301 module_platform_driver(xemaclite_of_driver);
1303 MODULE_AUTHOR("Xilinx, Inc.");
1304 MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver");
1305 MODULE_LICENSE("GPL");