]>
Commit | Line | Data |
---|---|---|
bb81b2dd JL |
1 | /* |
2 | * Xilinx EmacLite Linux driver for the Xilinx Ethernet MAC Lite device. | |
3 | * | |
4 | * This is a new flat driver which is based on the original emac_lite | |
5 | * driver from John Williams <john.williams@petalogix.com>. | |
6 | * | |
7 | * 2007-2009 (c) Xilinx, Inc. | |
8 | * | |
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. | |
13 | */ | |
14 | ||
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> | |
21 | #include <linux/io.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
22ae782f | 23 | #include <linux/of_address.h> |
bb81b2dd JL |
24 | #include <linux/of_device.h> |
25 | #include <linux/of_platform.h> | |
5cdaaa12 | 26 | #include <linux/of_mdio.h> |
4b6ba8aa | 27 | #include <linux/of_net.h> |
5cdaaa12 | 28 | #include <linux/phy.h> |
075cd29e | 29 | #include <linux/interrupt.h> |
bb81b2dd JL |
30 | |
31 | #define DRIVER_NAME "xilinx_emaclite" | |
32 | ||
33 | /* Register offsets for the EmacLite Core */ | |
34 | #define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */ | |
5cdaaa12 JL |
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 */ | |
bb81b2dd JL |
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 */ | |
42 | ||
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 */ | |
46 | ||
47 | #define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */ | |
48 | ||
5cdaaa12 JL |
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 */ | |
54 | ||
55 | /* MDIO Write Data Register Bit Masks */ | |
56 | #define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */ | |
57 | ||
58 | /* MDIO Read Data Register Bit Masks */ | |
59 | #define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */ | |
60 | ||
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 */ | |
64 | ||
bb81b2dd JL |
65 | /* Global Interrupt Enable Register (GIER) Bit Masks */ |
66 | #define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */ | |
67 | ||
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 | |
74 | * in the HW spec */ | |
75 | ||
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) | |
78 | ||
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 */ | |
82 | ||
83 | /* Transmit Packet Length Register (TPLR) */ | |
84 | #define XEL_TPLR_LENGTH_MASK 0x0000FFFF /* Tx packet length */ | |
85 | ||
86 | /* Receive Packet Length Register (RPLR) */ | |
87 | #define XEL_RPLR_LENGTH_MASK 0x0000FFFF /* Rx packet length */ | |
88 | ||
89 | #define XEL_HEADER_OFFSET 12 /* Offset to length field */ | |
90 | #define XEL_HEADER_SHIFT 16 /* Shift value for length */ | |
91 | ||
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 */ | |
95 | ||
96 | ||
97 | ||
98 | #define TX_TIMEOUT (60*HZ) /* Tx timeout is 60 seconds. */ | |
99 | #define ALIGNMENT 4 | |
100 | ||
101 | /* BUFFER_ALIGN(adr) calculates the number of bytes to the next alignment. */ | |
102 | #define BUFFER_ALIGN(adr) ((ALIGNMENT - ((u32) adr)) % ALIGNMENT) | |
103 | ||
104 | /** | |
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 | |
5cdaaa12 JL |
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 | |
bb81b2dd JL |
121 | */ |
122 | struct net_local { | |
123 | ||
124 | struct net_device *ndev; | |
125 | ||
126 | bool tx_ping_pong; | |
127 | bool rx_ping_pong; | |
128 | u32 next_tx_buf_to_use; | |
129 | u32 next_rx_buf_to_use; | |
130 | void __iomem *base_addr; | |
131 | ||
132 | spinlock_t reset_lock; | |
133 | struct sk_buff *deferred_skb; | |
5cdaaa12 JL |
134 | |
135 | struct phy_device *phy_dev; | |
136 | struct device_node *phy_node; | |
137 | ||
138 | struct mii_bus *mii_bus; | |
139 | int mdio_irqs[PHY_MAX_ADDR]; | |
140 | ||
141 | int last_link; | |
142 | bool has_mdio; | |
bb81b2dd JL |
143 | }; |
144 | ||
145 | ||
146 | /*************************/ | |
147 | /* EmacLite driver calls */ | |
148 | /*************************/ | |
149 | ||
150 | /** | |
151 | * xemaclite_enable_interrupts - Enable the interrupts for the EmacLite device | |
152 | * @drvdata: Pointer to the Emaclite device private data | |
153 | * | |
154 | * This function enables the Tx and Rx interrupts for the Emaclite device along | |
155 | * with the Global Interrupt Enable. | |
156 | */ | |
157 | static void xemaclite_enable_interrupts(struct net_local *drvdata) | |
158 | { | |
159 | u32 reg_data; | |
160 | ||
161 | /* Enable the Tx interrupts for the first Buffer */ | |
162 | reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET); | |
163 | out_be32(drvdata->base_addr + XEL_TSR_OFFSET, | |
164 | reg_data | XEL_TSR_XMIT_IE_MASK); | |
165 | ||
166 | /* Enable the Tx interrupts for the second Buffer if | |
167 | * configured in HW */ | |
168 | if (drvdata->tx_ping_pong != 0) { | |
169 | reg_data = in_be32(drvdata->base_addr + | |
170 | XEL_BUFFER_OFFSET + XEL_TSR_OFFSET); | |
171 | out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + | |
172 | XEL_TSR_OFFSET, | |
173 | reg_data | XEL_TSR_XMIT_IE_MASK); | |
174 | } | |
175 | ||
176 | /* Enable the Rx interrupts for the first buffer */ | |
bb81b2dd | 177 | out_be32(drvdata->base_addr + XEL_RSR_OFFSET, |
95acf7d7 | 178 | XEL_RSR_RECV_IE_MASK); |
bb81b2dd JL |
179 | |
180 | /* Enable the Rx interrupts for the second Buffer if | |
181 | * configured in HW */ | |
182 | if (drvdata->rx_ping_pong != 0) { | |
bb81b2dd JL |
183 | out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + |
184 | XEL_RSR_OFFSET, | |
95acf7d7 | 185 | XEL_RSR_RECV_IE_MASK); |
bb81b2dd JL |
186 | } |
187 | ||
188 | /* Enable the Global Interrupt Enable */ | |
189 | out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK); | |
190 | } | |
191 | ||
192 | /** | |
193 | * xemaclite_disable_interrupts - Disable the interrupts for the EmacLite device | |
194 | * @drvdata: Pointer to the Emaclite device private data | |
195 | * | |
196 | * This function disables the Tx and Rx interrupts for the Emaclite device, | |
197 | * along with the Global Interrupt Enable. | |
198 | */ | |
199 | static void xemaclite_disable_interrupts(struct net_local *drvdata) | |
200 | { | |
201 | u32 reg_data; | |
202 | ||
203 | /* Disable the Global Interrupt Enable */ | |
204 | out_be32(drvdata->base_addr + XEL_GIER_OFFSET, XEL_GIER_GIE_MASK); | |
205 | ||
206 | /* Disable the Tx interrupts for the first buffer */ | |
207 | reg_data = in_be32(drvdata->base_addr + XEL_TSR_OFFSET); | |
208 | out_be32(drvdata->base_addr + XEL_TSR_OFFSET, | |
209 | reg_data & (~XEL_TSR_XMIT_IE_MASK)); | |
210 | ||
211 | /* Disable the Tx interrupts for the second Buffer | |
212 | * if configured in HW */ | |
213 | if (drvdata->tx_ping_pong != 0) { | |
214 | reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + | |
215 | XEL_TSR_OFFSET); | |
216 | out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + | |
217 | XEL_TSR_OFFSET, | |
218 | reg_data & (~XEL_TSR_XMIT_IE_MASK)); | |
219 | } | |
220 | ||
221 | /* Disable the Rx interrupts for the first buffer */ | |
222 | reg_data = in_be32(drvdata->base_addr + XEL_RSR_OFFSET); | |
223 | out_be32(drvdata->base_addr + XEL_RSR_OFFSET, | |
224 | reg_data & (~XEL_RSR_RECV_IE_MASK)); | |
225 | ||
226 | /* Disable the Rx interrupts for the second buffer | |
227 | * if configured in HW */ | |
228 | if (drvdata->rx_ping_pong != 0) { | |
229 | ||
230 | reg_data = in_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + | |
231 | XEL_RSR_OFFSET); | |
232 | out_be32(drvdata->base_addr + XEL_BUFFER_OFFSET + | |
233 | XEL_RSR_OFFSET, | |
234 | reg_data & (~XEL_RSR_RECV_IE_MASK)); | |
235 | } | |
236 | } | |
237 | ||
238 | /** | |
239 | * xemaclite_aligned_write - Write from 16-bit aligned to 32-bit aligned address | |
240 | * @src_ptr: Void pointer to the 16-bit aligned source address | |
241 | * @dest_ptr: Pointer to the 32-bit aligned destination address | |
242 | * @length: Number bytes to write from source to destination | |
243 | * | |
244 | * This function writes data from a 16-bit aligned buffer to a 32-bit aligned | |
245 | * address in the EmacLite device. | |
246 | */ | |
247 | static void xemaclite_aligned_write(void *src_ptr, u32 *dest_ptr, | |
248 | unsigned length) | |
249 | { | |
250 | u32 align_buffer; | |
251 | u32 *to_u32_ptr; | |
252 | u16 *from_u16_ptr, *to_u16_ptr; | |
253 | ||
254 | to_u32_ptr = dest_ptr; | |
43d620c8 | 255 | from_u16_ptr = src_ptr; |
bb81b2dd JL |
256 | align_buffer = 0; |
257 | ||
258 | for (; length > 3; length -= 4) { | |
43d620c8 | 259 | to_u16_ptr = (u16 *)&align_buffer; |
bb81b2dd JL |
260 | *to_u16_ptr++ = *from_u16_ptr++; |
261 | *to_u16_ptr++ = *from_u16_ptr++; | |
262 | ||
263 | /* Output a word */ | |
264 | *to_u32_ptr++ = align_buffer; | |
265 | } | |
266 | if (length) { | |
267 | u8 *from_u8_ptr, *to_u8_ptr; | |
268 | ||
269 | /* Set up to output the remaining data */ | |
270 | align_buffer = 0; | |
271 | to_u8_ptr = (u8 *) &align_buffer; | |
272 | from_u8_ptr = (u8 *) from_u16_ptr; | |
273 | ||
274 | /* Output the remaining data */ | |
275 | for (; length > 0; length--) | |
276 | *to_u8_ptr++ = *from_u8_ptr++; | |
277 | ||
278 | *to_u32_ptr = align_buffer; | |
279 | } | |
280 | } | |
281 | ||
282 | /** | |
283 | * xemaclite_aligned_read - Read from 32-bit aligned to 16-bit aligned buffer | |
284 | * @src_ptr: Pointer to the 32-bit aligned source address | |
285 | * @dest_ptr: Pointer to the 16-bit aligned destination address | |
286 | * @length: Number bytes to read from source to destination | |
287 | * | |
288 | * This function reads data from a 32-bit aligned address in the EmacLite device | |
289 | * to a 16-bit aligned buffer. | |
290 | */ | |
291 | static void xemaclite_aligned_read(u32 *src_ptr, u8 *dest_ptr, | |
292 | unsigned length) | |
293 | { | |
294 | u16 *to_u16_ptr, *from_u16_ptr; | |
295 | u32 *from_u32_ptr; | |
296 | u32 align_buffer; | |
297 | ||
298 | from_u32_ptr = src_ptr; | |
299 | to_u16_ptr = (u16 *) dest_ptr; | |
300 | ||
301 | for (; length > 3; length -= 4) { | |
302 | /* Copy each word into the temporary buffer */ | |
303 | align_buffer = *from_u32_ptr++; | |
304 | from_u16_ptr = (u16 *)&align_buffer; | |
305 | ||
306 | /* Read data from source */ | |
307 | *to_u16_ptr++ = *from_u16_ptr++; | |
308 | *to_u16_ptr++ = *from_u16_ptr++; | |
309 | } | |
310 | ||
311 | if (length) { | |
312 | u8 *to_u8_ptr, *from_u8_ptr; | |
313 | ||
314 | /* Set up to read the remaining data */ | |
315 | to_u8_ptr = (u8 *) to_u16_ptr; | |
316 | align_buffer = *from_u32_ptr++; | |
317 | from_u8_ptr = (u8 *) &align_buffer; | |
318 | ||
319 | /* Read the remaining data */ | |
320 | for (; length > 0; length--) | |
321 | *to_u8_ptr = *from_u8_ptr; | |
322 | } | |
323 | } | |
324 | ||
325 | /** | |
326 | * xemaclite_send_data - Send an Ethernet frame | |
327 | * @drvdata: Pointer to the Emaclite device private data | |
328 | * @data: Pointer to the data to be sent | |
329 | * @byte_count: Total frame size, including header | |
330 | * | |
331 | * This function checks if the Tx buffer of the Emaclite device is free to send | |
332 | * data. If so, it fills the Tx buffer with data for transmission. Otherwise, it | |
333 | * returns an error. | |
334 | * | |
335 | * Return: 0 upon success or -1 if the buffer(s) are full. | |
336 | * | |
337 | * Note: The maximum Tx packet size can not be more than Ethernet header | |
338 | * (14 Bytes) + Maximum MTU (1500 bytes). This is excluding FCS. | |
339 | */ | |
340 | static int xemaclite_send_data(struct net_local *drvdata, u8 *data, | |
341 | unsigned int byte_count) | |
342 | { | |
343 | u32 reg_data; | |
344 | void __iomem *addr; | |
345 | ||
346 | /* Determine the expected Tx buffer address */ | |
347 | addr = drvdata->base_addr + drvdata->next_tx_buf_to_use; | |
348 | ||
349 | /* If the length is too large, truncate it */ | |
350 | if (byte_count > ETH_FRAME_LEN) | |
351 | byte_count = ETH_FRAME_LEN; | |
352 | ||
353 | /* Check if the expected buffer is available */ | |
354 | reg_data = in_be32(addr + XEL_TSR_OFFSET); | |
355 | if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK | | |
356 | XEL_TSR_XMIT_ACTIVE_MASK)) == 0) { | |
357 | ||
358 | /* Switch to next buffer if configured */ | |
359 | if (drvdata->tx_ping_pong != 0) | |
360 | drvdata->next_tx_buf_to_use ^= XEL_BUFFER_OFFSET; | |
361 | } else if (drvdata->tx_ping_pong != 0) { | |
362 | /* If the expected buffer is full, try the other buffer, | |
363 | * if it is configured in HW */ | |
364 | ||
365 | addr = (void __iomem __force *)((u32 __force)addr ^ | |
366 | XEL_BUFFER_OFFSET); | |
367 | reg_data = in_be32(addr + XEL_TSR_OFFSET); | |
368 | ||
369 | if ((reg_data & (XEL_TSR_XMIT_BUSY_MASK | | |
370 | XEL_TSR_XMIT_ACTIVE_MASK)) != 0) | |
371 | return -1; /* Buffers were full, return failure */ | |
372 | } else | |
373 | return -1; /* Buffer was full, return failure */ | |
374 | ||
375 | /* Write the frame to the buffer */ | |
376 | xemaclite_aligned_write(data, (u32 __force *) addr, byte_count); | |
377 | ||
378 | out_be32(addr + XEL_TPLR_OFFSET, (byte_count & XEL_TPLR_LENGTH_MASK)); | |
379 | ||
380 | /* Update the Tx Status Register to indicate that there is a | |
381 | * frame to send. Set the XEL_TSR_XMIT_ACTIVE_MASK flag which | |
382 | * is used by the interrupt handler to check whether a frame | |
383 | * has been transmitted */ | |
384 | reg_data = in_be32(addr + XEL_TSR_OFFSET); | |
385 | reg_data |= (XEL_TSR_XMIT_BUSY_MASK | XEL_TSR_XMIT_ACTIVE_MASK); | |
386 | out_be32(addr + XEL_TSR_OFFSET, reg_data); | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | /** | |
392 | * xemaclite_recv_data - Receive a frame | |
393 | * @drvdata: Pointer to the Emaclite device private data | |
394 | * @data: Address where the data is to be received | |
395 | * | |
396 | * This function is intended to be called from the interrupt context or | |
397 | * with a wrapper which waits for the receive frame to be available. | |
398 | * | |
399 | * Return: Total number of bytes received | |
400 | */ | |
401 | static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data) | |
402 | { | |
403 | void __iomem *addr; | |
404 | u16 length, proto_type; | |
405 | u32 reg_data; | |
406 | ||
407 | /* Determine the expected buffer address */ | |
408 | addr = (drvdata->base_addr + drvdata->next_rx_buf_to_use); | |
409 | ||
410 | /* Verify which buffer has valid data */ | |
411 | reg_data = in_be32(addr + XEL_RSR_OFFSET); | |
412 | ||
413 | if ((reg_data & XEL_RSR_RECV_DONE_MASK) == XEL_RSR_RECV_DONE_MASK) { | |
414 | if (drvdata->rx_ping_pong != 0) | |
415 | drvdata->next_rx_buf_to_use ^= XEL_BUFFER_OFFSET; | |
416 | } else { | |
417 | /* The instance is out of sync, try other buffer if other | |
418 | * buffer is configured, return 0 otherwise. If the instance is | |
419 | * out of sync, do not update the 'next_rx_buf_to_use' since it | |
420 | * will correct on subsequent calls */ | |
421 | if (drvdata->rx_ping_pong != 0) | |
422 | addr = (void __iomem __force *)((u32 __force)addr ^ | |
423 | XEL_BUFFER_OFFSET); | |
424 | else | |
425 | return 0; /* No data was available */ | |
426 | ||
427 | /* Verify that buffer has valid data */ | |
428 | reg_data = in_be32(addr + XEL_RSR_OFFSET); | |
429 | if ((reg_data & XEL_RSR_RECV_DONE_MASK) != | |
430 | XEL_RSR_RECV_DONE_MASK) | |
431 | return 0; /* No data was available */ | |
432 | } | |
433 | ||
434 | /* Get the protocol type of the ethernet frame that arrived */ | |
44180a57 MS |
435 | proto_type = ((ntohl(in_be32(addr + XEL_HEADER_OFFSET + |
436 | XEL_RXBUFF_OFFSET)) >> XEL_HEADER_SHIFT) & | |
bb81b2dd JL |
437 | XEL_RPLR_LENGTH_MASK); |
438 | ||
439 | /* Check if received ethernet frame is a raw ethernet frame | |
440 | * or an IP packet or an ARP packet */ | |
441 | if (proto_type > (ETH_FRAME_LEN + ETH_FCS_LEN)) { | |
442 | ||
443 | if (proto_type == ETH_P_IP) { | |
44180a57 | 444 | length = ((ntohl(in_be32(addr + |
bb81b2dd | 445 | XEL_HEADER_IP_LENGTH_OFFSET + |
44180a57 | 446 | XEL_RXBUFF_OFFSET)) >> |
bb81b2dd JL |
447 | XEL_HEADER_SHIFT) & |
448 | XEL_RPLR_LENGTH_MASK); | |
449 | length += ETH_HLEN + ETH_FCS_LEN; | |
450 | ||
451 | } else if (proto_type == ETH_P_ARP) | |
452 | length = XEL_ARP_PACKET_SIZE + ETH_HLEN + ETH_FCS_LEN; | |
453 | else | |
454 | /* Field contains type other than IP or ARP, use max | |
455 | * frame size and let user parse it */ | |
456 | length = ETH_FRAME_LEN + ETH_FCS_LEN; | |
457 | } else | |
458 | /* Use the length in the frame, plus the header and trailer */ | |
459 | length = proto_type + ETH_HLEN + ETH_FCS_LEN; | |
460 | ||
461 | /* Read from the EmacLite device */ | |
462 | xemaclite_aligned_read((u32 __force *) (addr + XEL_RXBUFF_OFFSET), | |
463 | data, length); | |
464 | ||
465 | /* Acknowledge the frame */ | |
466 | reg_data = in_be32(addr + XEL_RSR_OFFSET); | |
467 | reg_data &= ~XEL_RSR_RECV_DONE_MASK; | |
468 | out_be32(addr + XEL_RSR_OFFSET, reg_data); | |
469 | ||
470 | return length; | |
471 | } | |
472 | ||
473 | /** | |
5cdaaa12 | 474 | * xemaclite_update_address - Update the MAC address in the device |
bb81b2dd JL |
475 | * @drvdata: Pointer to the Emaclite device private data |
476 | * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value) | |
477 | * | |
478 | * Tx must be idle and Rx should be idle for deterministic results. | |
479 | * It is recommended that this function should be called after the | |
480 | * initialization and before transmission of any packets from the device. | |
481 | * The MAC address can be programmed using any of the two transmit | |
482 | * buffers (if configured). | |
483 | */ | |
5cdaaa12 JL |
484 | static void xemaclite_update_address(struct net_local *drvdata, |
485 | u8 *address_ptr) | |
bb81b2dd JL |
486 | { |
487 | void __iomem *addr; | |
488 | u32 reg_data; | |
489 | ||
490 | /* Determine the expected Tx buffer address */ | |
491 | addr = drvdata->base_addr + drvdata->next_tx_buf_to_use; | |
492 | ||
493 | xemaclite_aligned_write(address_ptr, (u32 __force *) addr, ETH_ALEN); | |
494 | ||
495 | out_be32(addr + XEL_TPLR_OFFSET, ETH_ALEN); | |
496 | ||
497 | /* Update the MAC address in the EmacLite */ | |
498 | reg_data = in_be32(addr + XEL_TSR_OFFSET); | |
499 | out_be32(addr + XEL_TSR_OFFSET, reg_data | XEL_TSR_PROG_MAC_ADDR); | |
500 | ||
501 | /* Wait for EmacLite to finish with the MAC address update */ | |
502 | while ((in_be32(addr + XEL_TSR_OFFSET) & | |
503 | XEL_TSR_PROG_MAC_ADDR) != 0) | |
504 | ; | |
505 | } | |
506 | ||
5cdaaa12 JL |
507 | /** |
508 | * xemaclite_set_mac_address - Set the MAC address for this device | |
509 | * @dev: Pointer to the network device instance | |
510 | * @addr: Void pointer to the sockaddr structure | |
511 | * | |
512 | * This function copies the HW address from the sockaddr strucutre to the | |
513 | * net_device structure and updates the address in HW. | |
514 | * | |
515 | * Return: Error if the net device is busy or 0 if the addr is set | |
516 | * successfully | |
517 | */ | |
518 | static int xemaclite_set_mac_address(struct net_device *dev, void *address) | |
519 | { | |
ece49153 | 520 | struct net_local *lp = netdev_priv(dev); |
5cdaaa12 JL |
521 | struct sockaddr *addr = address; |
522 | ||
523 | if (netif_running(dev)) | |
524 | return -EBUSY; | |
525 | ||
526 | memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); | |
527 | xemaclite_update_address(lp, dev->dev_addr); | |
528 | return 0; | |
529 | } | |
530 | ||
bb81b2dd JL |
531 | /** |
532 | * xemaclite_tx_timeout - Callback for Tx Timeout | |
533 | * @dev: Pointer to the network device | |
534 | * | |
535 | * This function is called when Tx time out occurs for Emaclite device. | |
536 | */ | |
537 | static void xemaclite_tx_timeout(struct net_device *dev) | |
538 | { | |
ece49153 | 539 | struct net_local *lp = netdev_priv(dev); |
bb81b2dd JL |
540 | unsigned long flags; |
541 | ||
542 | dev_err(&lp->ndev->dev, "Exceeded transmit timeout of %lu ms\n", | |
543 | TX_TIMEOUT * 1000UL / HZ); | |
544 | ||
545 | dev->stats.tx_errors++; | |
546 | ||
547 | /* Reset the device */ | |
548 | spin_lock_irqsave(&lp->reset_lock, flags); | |
549 | ||
550 | /* Shouldn't really be necessary, but shouldn't hurt */ | |
551 | netif_stop_queue(dev); | |
552 | ||
553 | xemaclite_disable_interrupts(lp); | |
554 | xemaclite_enable_interrupts(lp); | |
555 | ||
556 | if (lp->deferred_skb) { | |
557 | dev_kfree_skb(lp->deferred_skb); | |
558 | lp->deferred_skb = NULL; | |
559 | dev->stats.tx_errors++; | |
560 | } | |
561 | ||
562 | /* To exclude tx timeout */ | |
1ae5dc34 | 563 | dev->trans_start = jiffies; /* prevent tx timeout */ |
bb81b2dd JL |
564 | |
565 | /* We're all ready to go. Start the queue */ | |
566 | netif_wake_queue(dev); | |
567 | spin_unlock_irqrestore(&lp->reset_lock, flags); | |
568 | } | |
569 | ||
570 | /**********************/ | |
571 | /* Interrupt Handlers */ | |
572 | /**********************/ | |
573 | ||
574 | /** | |
575 | * xemaclite_tx_handler - Interrupt handler for frames sent | |
576 | * @dev: Pointer to the network device | |
577 | * | |
578 | * This function updates the number of packets transmitted and handles the | |
579 | * deferred skb, if there is one. | |
580 | */ | |
581 | static void xemaclite_tx_handler(struct net_device *dev) | |
582 | { | |
ece49153 | 583 | struct net_local *lp = netdev_priv(dev); |
bb81b2dd JL |
584 | |
585 | dev->stats.tx_packets++; | |
586 | if (lp->deferred_skb) { | |
587 | if (xemaclite_send_data(lp, | |
588 | (u8 *) lp->deferred_skb->data, | |
589 | lp->deferred_skb->len) != 0) | |
590 | return; | |
591 | else { | |
592 | dev->stats.tx_bytes += lp->deferred_skb->len; | |
593 | dev_kfree_skb_irq(lp->deferred_skb); | |
594 | lp->deferred_skb = NULL; | |
1ae5dc34 | 595 | dev->trans_start = jiffies; /* prevent tx timeout */ |
bb81b2dd JL |
596 | netif_wake_queue(dev); |
597 | } | |
598 | } | |
599 | } | |
600 | ||
601 | /** | |
602 | * xemaclite_rx_handler- Interrupt handler for frames received | |
603 | * @dev: Pointer to the network device | |
604 | * | |
605 | * This function allocates memory for a socket buffer, fills it with data | |
606 | * received and hands it over to the TCP/IP stack. | |
607 | */ | |
608 | static void xemaclite_rx_handler(struct net_device *dev) | |
609 | { | |
ece49153 | 610 | struct net_local *lp = netdev_priv(dev); |
bb81b2dd JL |
611 | struct sk_buff *skb; |
612 | unsigned int align; | |
613 | u32 len; | |
614 | ||
615 | len = ETH_FRAME_LEN + ETH_FCS_LEN; | |
dae2e9f4 | 616 | skb = netdev_alloc_skb(dev, len + ALIGNMENT); |
bb81b2dd JL |
617 | if (!skb) { |
618 | /* Couldn't get memory. */ | |
619 | dev->stats.rx_dropped++; | |
620 | dev_err(&lp->ndev->dev, "Could not allocate receive buffer\n"); | |
621 | return; | |
622 | } | |
623 | ||
624 | /* | |
625 | * A new skb should have the data halfword aligned, but this code is | |
626 | * here just in case that isn't true. Calculate how many | |
627 | * bytes we should reserve to get the data to start on a word | |
628 | * boundary */ | |
629 | align = BUFFER_ALIGN(skb->data); | |
630 | if (align) | |
631 | skb_reserve(skb, align); | |
632 | ||
633 | skb_reserve(skb, 2); | |
634 | ||
635 | len = xemaclite_recv_data(lp, (u8 *) skb->data); | |
636 | ||
637 | if (!len) { | |
638 | dev->stats.rx_errors++; | |
639 | dev_kfree_skb_irq(skb); | |
640 | return; | |
641 | } | |
642 | ||
643 | skb_put(skb, len); /* Tell the skb how much data we got */ | |
bb81b2dd JL |
644 | |
645 | skb->protocol = eth_type_trans(skb, dev); | |
bc8acf2c | 646 | skb_checksum_none_assert(skb); |
bb81b2dd JL |
647 | |
648 | dev->stats.rx_packets++; | |
649 | dev->stats.rx_bytes += len; | |
bb81b2dd | 650 | |
570773c5 RC |
651 | if (!skb_defer_rx_timestamp(skb)) |
652 | netif_rx(skb); /* Send the packet upstream */ | |
bb81b2dd JL |
653 | } |
654 | ||
655 | /** | |
656 | * xemaclite_interrupt - Interrupt handler for this driver | |
657 | * @irq: Irq of the Emaclite device | |
658 | * @dev_id: Void pointer to the network device instance used as callback | |
659 | * reference | |
660 | * | |
661 | * This function handles the Tx and Rx interrupts of the EmacLite device. | |
662 | */ | |
663 | static irqreturn_t xemaclite_interrupt(int irq, void *dev_id) | |
664 | { | |
3db1cd5c | 665 | bool tx_complete = false; |
bb81b2dd | 666 | struct net_device *dev = dev_id; |
ece49153 | 667 | struct net_local *lp = netdev_priv(dev); |
bb81b2dd JL |
668 | void __iomem *base_addr = lp->base_addr; |
669 | u32 tx_status; | |
670 | ||
671 | /* Check if there is Rx Data available */ | |
672 | if ((in_be32(base_addr + XEL_RSR_OFFSET) & XEL_RSR_RECV_DONE_MASK) || | |
673 | (in_be32(base_addr + XEL_BUFFER_OFFSET + XEL_RSR_OFFSET) | |
674 | & XEL_RSR_RECV_DONE_MASK)) | |
675 | ||
676 | xemaclite_rx_handler(dev); | |
677 | ||
678 | /* Check if the Transmission for the first buffer is completed */ | |
679 | tx_status = in_be32(base_addr + XEL_TSR_OFFSET); | |
680 | if (((tx_status & XEL_TSR_XMIT_BUSY_MASK) == 0) && | |
681 | (tx_status & XEL_TSR_XMIT_ACTIVE_MASK) != 0) { | |
682 | ||
683 | tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK; | |
684 | out_be32(base_addr + XEL_TSR_OFFSET, tx_status); | |
685 | ||
3db1cd5c | 686 | tx_complete = true; |
bb81b2dd JL |
687 | } |
688 | ||
689 | /* Check if the Transmission for the second buffer is completed */ | |
690 | tx_status = in_be32(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) { | |
693 | ||
694 | tx_status &= ~XEL_TSR_XMIT_ACTIVE_MASK; | |
695 | out_be32(base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, | |
696 | tx_status); | |
697 | ||
3db1cd5c | 698 | tx_complete = true; |
bb81b2dd JL |
699 | } |
700 | ||
701 | /* If there was a Tx interrupt, call the Tx Handler */ | |
702 | if (tx_complete != 0) | |
703 | xemaclite_tx_handler(dev); | |
704 | ||
705 | return IRQ_HANDLED; | |
706 | } | |
707 | ||
5cdaaa12 JL |
708 | /**********************/ |
709 | /* MDIO Bus functions */ | |
710 | /**********************/ | |
711 | ||
712 | /** | |
713 | * xemaclite_mdio_wait - Wait for the MDIO to be ready to use | |
714 | * @lp: Pointer to the Emaclite device private data | |
715 | * | |
716 | * This function waits till the device is ready to accept a new MDIO | |
717 | * request. | |
718 | * | |
719 | * Return: 0 for success or ETIMEDOUT for a timeout | |
720 | */ | |
721 | ||
722 | static int xemaclite_mdio_wait(struct net_local *lp) | |
723 | { | |
724 | long end = jiffies + 2; | |
725 | ||
726 | /* wait for the MDIO interface to not be busy or timeout | |
727 | after some time. | |
728 | */ | |
729 | while (in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET) & | |
730 | XEL_MDIOCTRL_MDIOSTS_MASK) { | |
731 | if (end - jiffies <= 0) { | |
732 | WARN_ON(1); | |
733 | return -ETIMEDOUT; | |
734 | } | |
735 | msleep(1); | |
736 | } | |
737 | return 0; | |
738 | } | |
739 | ||
740 | /** | |
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 | |
745 | * | |
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. | |
749 | * | |
750 | * Return: Value read from the MII management register | |
751 | */ | |
752 | static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg) | |
753 | { | |
754 | struct net_local *lp = bus->priv; | |
755 | u32 ctrl_reg; | |
756 | u32 rc; | |
757 | ||
758 | if (xemaclite_mdio_wait(lp)) | |
759 | return -ETIMEDOUT; | |
760 | ||
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. | |
764 | */ | |
765 | ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET); | |
766 | out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET, | |
767 | XEL_MDIOADDR_OP_MASK | | |
768 | ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg)); | |
769 | out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET, | |
770 | ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK); | |
771 | ||
772 | if (xemaclite_mdio_wait(lp)) | |
773 | return -ETIMEDOUT; | |
774 | ||
775 | rc = in_be32(lp->base_addr + XEL_MDIORD_OFFSET); | |
776 | ||
777 | dev_dbg(&lp->ndev->dev, | |
778 | "xemaclite_mdio_read(phy_id=%i, reg=%x) == %x\n", | |
779 | phy_id, reg, rc); | |
780 | ||
781 | return rc; | |
782 | } | |
783 | ||
784 | /** | |
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 | |
790 | * | |
25985edc | 791 | * This function waits till the device is ready to accept a new MDIO |
5cdaaa12 JL |
792 | * request and then writes the val to the MDIO Write Data register. |
793 | */ | |
794 | static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg, | |
795 | u16 val) | |
796 | { | |
797 | struct net_local *lp = bus->priv; | |
798 | u32 ctrl_reg; | |
799 | ||
800 | dev_dbg(&lp->ndev->dev, | |
801 | "xemaclite_mdio_write(phy_id=%i, reg=%x, val=%x)\n", | |
802 | phy_id, reg, val); | |
803 | ||
804 | if (xemaclite_mdio_wait(lp)) | |
805 | return -ETIMEDOUT; | |
806 | ||
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. | |
811 | */ | |
812 | ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET); | |
813 | out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET, | |
814 | ~XEL_MDIOADDR_OP_MASK & | |
815 | ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg)); | |
816 | out_be32(lp->base_addr + XEL_MDIOWR_OFFSET, val); | |
817 | out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET, | |
818 | ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK); | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
823 | /** | |
824 | * xemaclite_mdio_reset - Reset the mdio bus. | |
825 | * @bus: Pointer to the MII bus | |
826 | * | |
827 | * This function is required(?) as per Documentation/networking/phy.txt. | |
828 | * There is no reset in this device; this function always returns 0. | |
829 | */ | |
830 | static int xemaclite_mdio_reset(struct mii_bus *bus) | |
831 | { | |
832 | return 0; | |
833 | } | |
834 | ||
835 | /** | |
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 | |
839 | * | |
840 | * This function enables MDIO bus in the Emaclite device and registers a | |
841 | * mii_bus. | |
842 | * | |
843 | * Return: 0 upon success or a negative error upon failure | |
844 | */ | |
845 | static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev) | |
846 | { | |
847 | struct mii_bus *bus; | |
848 | int rc; | |
849 | struct resource res; | |
850 | struct device_node *np = of_get_parent(lp->phy_node); | |
851 | ||
852 | /* Don't register the MDIO bus if the phy_node or its parent node | |
853 | * can't be found. | |
854 | */ | |
855 | if (!np) | |
856 | return -ENODEV; | |
857 | ||
858 | /* Enable the MDIO bus by asserting the enable bit in MDIO Control | |
859 | * register. | |
860 | */ | |
861 | out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET, | |
862 | XEL_MDIOCTRL_MDIOEN_MASK); | |
863 | ||
864 | bus = mdiobus_alloc(); | |
865 | if (!bus) | |
866 | return -ENOMEM; | |
867 | ||
868 | of_address_to_resource(np, 0, &res); | |
869 | snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx", | |
870 | (unsigned long long)res.start); | |
871 | bus->priv = lp; | |
872 | bus->name = "Xilinx Emaclite MDIO"; | |
873 | bus->read = xemaclite_mdio_read; | |
874 | bus->write = xemaclite_mdio_write; | |
875 | bus->reset = xemaclite_mdio_reset; | |
876 | bus->parent = dev; | |
877 | bus->irq = lp->mdio_irqs; /* preallocated IRQ table */ | |
878 | ||
879 | lp->mii_bus = bus; | |
880 | ||
881 | rc = of_mdiobus_register(bus, np); | |
882 | if (rc) | |
883 | goto err_register; | |
884 | ||
885 | return 0; | |
886 | ||
887 | err_register: | |
888 | mdiobus_free(bus); | |
889 | return rc; | |
890 | } | |
891 | ||
892 | /** | |
893 | * xemaclite_adjust_link - Link state callback for the Emaclite device | |
894 | * @ndev: pointer to net_device struct | |
895 | * | |
896 | * There's nothing in the Emaclite device to be configured when the link | |
897 | * state changes. We just print the status. | |
898 | */ | |
899 | void xemaclite_adjust_link(struct net_device *ndev) | |
900 | { | |
901 | struct net_local *lp = netdev_priv(ndev); | |
902 | struct phy_device *phy = lp->phy_dev; | |
903 | int link_state; | |
904 | ||
905 | /* hash together the state values to decide if something has changed */ | |
906 | link_state = phy->speed | (phy->duplex << 1) | phy->link; | |
907 | ||
908 | if (lp->last_link != link_state) { | |
909 | lp->last_link = link_state; | |
910 | phy_print_status(phy); | |
911 | } | |
912 | } | |
913 | ||
bb81b2dd JL |
914 | /** |
915 | * xemaclite_open - Open the network device | |
916 | * @dev: Pointer to the network device | |
917 | * | |
918 | * This function sets the MAC address, requests an IRQ and enables interrupts | |
919 | * for the Emaclite device and starts the Tx queue. | |
5cdaaa12 | 920 | * It also connects to the phy device, if MDIO is included in Emaclite device. |
bb81b2dd JL |
921 | */ |
922 | static int xemaclite_open(struct net_device *dev) | |
923 | { | |
ece49153 | 924 | struct net_local *lp = netdev_priv(dev); |
bb81b2dd JL |
925 | int retval; |
926 | ||
927 | /* Just to be safe, stop the device first */ | |
928 | xemaclite_disable_interrupts(lp); | |
929 | ||
5cdaaa12 JL |
930 | if (lp->phy_node) { |
931 | u32 bmcr; | |
932 | ||
933 | lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node, | |
934 | xemaclite_adjust_link, 0, | |
935 | PHY_INTERFACE_MODE_MII); | |
936 | if (!lp->phy_dev) { | |
937 | dev_err(&lp->ndev->dev, "of_phy_connect() failed\n"); | |
938 | return -ENODEV; | |
939 | } | |
940 | ||
941 | /* EmacLite doesn't support giga-bit speeds */ | |
942 | lp->phy_dev->supported &= (PHY_BASIC_FEATURES); | |
943 | lp->phy_dev->advertising = lp->phy_dev->supported; | |
944 | ||
945 | /* Don't advertise 1000BASE-T Full/Half duplex speeds */ | |
946 | phy_write(lp->phy_dev, MII_CTRL1000, 0); | |
947 | ||
948 | /* Advertise only 10 and 100mbps full/half duplex speeds */ | |
3a5395b3 JRE |
949 | phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL | |
950 | ADVERTISE_CSMA); | |
5cdaaa12 JL |
951 | |
952 | /* Restart auto negotiation */ | |
953 | bmcr = phy_read(lp->phy_dev, MII_BMCR); | |
954 | bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART); | |
955 | phy_write(lp->phy_dev, MII_BMCR, bmcr); | |
956 | ||
957 | phy_start(lp->phy_dev); | |
958 | } | |
959 | ||
bb81b2dd | 960 | /* Set the MAC address each time opened */ |
5cdaaa12 | 961 | xemaclite_update_address(lp, dev->dev_addr); |
bb81b2dd JL |
962 | |
963 | /* Grab the IRQ */ | |
a0607fd3 | 964 | retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev); |
bb81b2dd JL |
965 | if (retval) { |
966 | dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n", | |
967 | dev->irq); | |
5cdaaa12 JL |
968 | if (lp->phy_dev) |
969 | phy_disconnect(lp->phy_dev); | |
970 | lp->phy_dev = NULL; | |
971 | ||
bb81b2dd JL |
972 | return retval; |
973 | } | |
974 | ||
975 | /* Enable Interrupts */ | |
976 | xemaclite_enable_interrupts(lp); | |
977 | ||
978 | /* We're ready to go */ | |
979 | netif_start_queue(dev); | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
984 | /** | |
985 | * xemaclite_close - Close the network device | |
986 | * @dev: Pointer to the network device | |
987 | * | |
988 | * This function stops the Tx queue, disables interrupts and frees the IRQ for | |
989 | * the Emaclite device. | |
5cdaaa12 | 990 | * It also disconnects the phy device associated with the Emaclite device. |
bb81b2dd JL |
991 | */ |
992 | static int xemaclite_close(struct net_device *dev) | |
993 | { | |
ece49153 | 994 | struct net_local *lp = netdev_priv(dev); |
bb81b2dd JL |
995 | |
996 | netif_stop_queue(dev); | |
997 | xemaclite_disable_interrupts(lp); | |
998 | free_irq(dev->irq, dev); | |
999 | ||
5cdaaa12 JL |
1000 | if (lp->phy_dev) |
1001 | phy_disconnect(lp->phy_dev); | |
1002 | lp->phy_dev = NULL; | |
1003 | ||
bb81b2dd JL |
1004 | return 0; |
1005 | } | |
1006 | ||
bb81b2dd JL |
1007 | /** |
1008 | * xemaclite_send - Transmit a frame | |
1009 | * @orig_skb: Pointer to the socket buffer to be transmitted | |
1010 | * @dev: Pointer to the network device | |
1011 | * | |
1012 | * This function checks if the Tx buffer of the Emaclite device is free to send | |
1013 | * data. If so, it fills the Tx buffer with data from socket buffer data, | |
1014 | * updates the stats and frees the socket buffer. The Tx completion is signaled | |
1015 | * by an interrupt. If the Tx buffer isn't free, then the socket buffer is | |
1016 | * deferred and the Tx queue is stopped so that the deferred socket buffer can | |
1017 | * be transmitted when the Emaclite device is free to transmit data. | |
1018 | * | |
1019 | * Return: 0, always. | |
1020 | */ | |
1021 | static int xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev) | |
1022 | { | |
ece49153 | 1023 | struct net_local *lp = netdev_priv(dev); |
bb81b2dd JL |
1024 | struct sk_buff *new_skb; |
1025 | unsigned int len; | |
1026 | unsigned long flags; | |
1027 | ||
1028 | len = orig_skb->len; | |
1029 | ||
1030 | new_skb = orig_skb; | |
1031 | ||
1032 | spin_lock_irqsave(&lp->reset_lock, flags); | |
1033 | if (xemaclite_send_data(lp, (u8 *) new_skb->data, len) != 0) { | |
1034 | /* If the Emaclite Tx buffer is busy, stop the Tx queue and | |
570773c5 | 1035 | * defer the skb for transmission during the ISR, after the |
bb81b2dd JL |
1036 | * current transmission is complete */ |
1037 | netif_stop_queue(dev); | |
1038 | lp->deferred_skb = new_skb; | |
570773c5 RC |
1039 | /* Take the time stamp now, since we can't do this in an ISR. */ |
1040 | skb_tx_timestamp(new_skb); | |
bb81b2dd JL |
1041 | spin_unlock_irqrestore(&lp->reset_lock, flags); |
1042 | return 0; | |
1043 | } | |
1044 | spin_unlock_irqrestore(&lp->reset_lock, flags); | |
1045 | ||
570773c5 RC |
1046 | skb_tx_timestamp(new_skb); |
1047 | ||
bb81b2dd JL |
1048 | dev->stats.tx_bytes += len; |
1049 | dev_kfree_skb(new_skb); | |
bb81b2dd JL |
1050 | |
1051 | return 0; | |
1052 | } | |
1053 | ||
bb81b2dd JL |
1054 | /** |
1055 | * xemaclite_remove_ndev - Free the network device | |
1056 | * @ndev: Pointer to the network device to be freed | |
1057 | * | |
1058 | * This function un maps the IO region of the Emaclite device and frees the net | |
1059 | * device. | |
1060 | */ | |
1061 | static void xemaclite_remove_ndev(struct net_device *ndev) | |
1062 | { | |
1063 | if (ndev) { | |
ece49153 | 1064 | struct net_local *lp = netdev_priv(ndev); |
bb81b2dd JL |
1065 | |
1066 | if (lp->base_addr) | |
1067 | iounmap((void __iomem __force *) (lp->base_addr)); | |
1068 | free_netdev(ndev); | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | /** | |
1073 | * get_bool - Get a parameter from the OF device | |
1074 | * @ofdev: Pointer to OF device structure | |
1075 | * @s: Property to be retrieved | |
1076 | * | |
1077 | * This function looks for a property in the device node and returns the value | |
1078 | * of the property if its found or 0 if the property is not found. | |
1079 | * | |
1080 | * Return: Value of the parameter if the parameter is found, or 0 otherwise | |
1081 | */ | |
2dc11581 | 1082 | static bool get_bool(struct platform_device *ofdev, const char *s) |
bb81b2dd | 1083 | { |
61c7a080 | 1084 | u32 *p = (u32 *)of_get_property(ofdev->dev.of_node, s, NULL); |
bb81b2dd JL |
1085 | |
1086 | if (p) { | |
1087 | return (bool)*p; | |
1088 | } else { | |
1089 | dev_warn(&ofdev->dev, "Parameter %s not found," | |
1090 | "defaulting to false\n", s); | |
1091 | return 0; | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | static struct net_device_ops xemaclite_netdev_ops; | |
1096 | ||
1097 | /** | |
1098 | * xemaclite_of_probe - Probe method for the Emaclite device. | |
1099 | * @ofdev: Pointer to OF device structure | |
1100 | * @match: Pointer to the structure used for matching a device | |
1101 | * | |
1102 | * This function probes for the Emaclite device in the device tree. | |
1103 | * It initializes the driver data structure and the hardware, sets the MAC | |
1104 | * address and registers the network device. | |
5cdaaa12 JL |
1105 | * It also registers a mii_bus for the Emaclite device, if MDIO is included |
1106 | * in the device. | |
bb81b2dd JL |
1107 | * |
1108 | * Return: 0, if the driver is bound to the Emaclite device, or | |
1109 | * a negative error if there is failure. | |
1110 | */ | |
06b0e683 | 1111 | static int xemaclite_of_probe(struct platform_device *ofdev) |
bb81b2dd JL |
1112 | { |
1113 | struct resource r_irq; /* Interrupt resources */ | |
1114 | struct resource r_mem; /* IO mem resources */ | |
1115 | struct net_device *ndev = NULL; | |
1116 | struct net_local *lp = NULL; | |
1117 | struct device *dev = &ofdev->dev; | |
1118 | const void *mac_address; | |
1119 | ||
1120 | int rc = 0; | |
1121 | ||
1122 | dev_info(dev, "Device Tree Probing\n"); | |
1123 | ||
1124 | /* Get iospace for the device */ | |
61c7a080 | 1125 | rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem); |
bb81b2dd JL |
1126 | if (rc) { |
1127 | dev_err(dev, "invalid address\n"); | |
1128 | return rc; | |
1129 | } | |
1130 | ||
1131 | /* Get IRQ for the device */ | |
61c7a080 | 1132 | rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq); |
4e68ea26 | 1133 | if (!rc) { |
bb81b2dd JL |
1134 | dev_err(dev, "no IRQ found\n"); |
1135 | return rc; | |
1136 | } | |
1137 | ||
1138 | /* Create an ethernet device instance */ | |
1139 | ndev = alloc_etherdev(sizeof(struct net_local)); | |
41de8d4c | 1140 | if (!ndev) |
bb81b2dd | 1141 | return -ENOMEM; |
bb81b2dd JL |
1142 | |
1143 | dev_set_drvdata(dev, ndev); | |
5cdaaa12 | 1144 | SET_NETDEV_DEV(ndev, &ofdev->dev); |
bb81b2dd JL |
1145 | |
1146 | ndev->irq = r_irq.start; | |
1147 | ndev->mem_start = r_mem.start; | |
1148 | ndev->mem_end = r_mem.end; | |
1149 | ||
1150 | lp = netdev_priv(ndev); | |
1151 | lp->ndev = ndev; | |
1152 | ||
1153 | if (!request_mem_region(ndev->mem_start, | |
1154 | ndev->mem_end - ndev->mem_start + 1, | |
1155 | DRIVER_NAME)) { | |
1156 | dev_err(dev, "Couldn't lock memory region at %p\n", | |
1157 | (void *)ndev->mem_start); | |
1158 | rc = -EBUSY; | |
1159 | goto error2; | |
1160 | } | |
1161 | ||
1162 | /* Get the virtual base address for the device */ | |
575400bf | 1163 | lp->base_addr = ioremap(r_mem.start, resource_size(&r_mem)); |
bb81b2dd JL |
1164 | if (NULL == lp->base_addr) { |
1165 | dev_err(dev, "EmacLite: Could not allocate iomem\n"); | |
1166 | rc = -EIO; | |
1167 | goto error1; | |
1168 | } | |
1169 | ||
1170 | spin_lock_init(&lp->reset_lock); | |
1171 | lp->next_tx_buf_to_use = 0x0; | |
1172 | lp->next_rx_buf_to_use = 0x0; | |
1173 | lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong"); | |
1174 | lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong"); | |
61c7a080 | 1175 | mac_address = of_get_mac_address(ofdev->dev.of_node); |
bb81b2dd JL |
1176 | |
1177 | if (mac_address) | |
1178 | /* Set the MAC address. */ | |
1179 | memcpy(ndev->dev_addr, mac_address, 6); | |
1180 | else | |
1181 | dev_warn(dev, "No MAC address found\n"); | |
1182 | ||
1183 | /* Clear the Tx CSR's in case this is a restart */ | |
1184 | out_be32(lp->base_addr + XEL_TSR_OFFSET, 0); | |
1185 | out_be32(lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, 0); | |
1186 | ||
1187 | /* Set the MAC address in the EmacLite device */ | |
5cdaaa12 JL |
1188 | xemaclite_update_address(lp, ndev->dev_addr); |
1189 | ||
61c7a080 | 1190 | lp->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0); |
5cdaaa12 JL |
1191 | rc = xemaclite_mdio_setup(lp, &ofdev->dev); |
1192 | if (rc) | |
1193 | dev_warn(&ofdev->dev, "error registering MDIO bus\n"); | |
bb81b2dd | 1194 | |
5491f3a5 | 1195 | dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); |
bb81b2dd JL |
1196 | |
1197 | ndev->netdev_ops = &xemaclite_netdev_ops; | |
1198 | ndev->flags &= ~IFF_MULTICAST; | |
1199 | ndev->watchdog_timeo = TX_TIMEOUT; | |
1200 | ||
1201 | /* Finally, register the device */ | |
1202 | rc = register_netdev(ndev); | |
1203 | if (rc) { | |
1204 | dev_err(dev, | |
1205 | "Cannot register network device, aborting\n"); | |
1206 | goto error1; | |
1207 | } | |
1208 | ||
1209 | dev_info(dev, | |
1210 | "Xilinx EmacLite at 0x%08X mapped to 0x%08X, irq=%d\n", | |
1211 | (unsigned int __force)ndev->mem_start, | |
1212 | (unsigned int __force)lp->base_addr, ndev->irq); | |
1213 | return 0; | |
1214 | ||
1215 | error1: | |
575400bf | 1216 | release_mem_region(ndev->mem_start, resource_size(&r_mem)); |
bb81b2dd JL |
1217 | |
1218 | error2: | |
1219 | xemaclite_remove_ndev(ndev); | |
1220 | return rc; | |
1221 | } | |
1222 | ||
1223 | /** | |
1224 | * xemaclite_of_remove - Unbind the driver from the Emaclite device. | |
1225 | * @of_dev: Pointer to OF device structure | |
1226 | * | |
1227 | * This function is called if a device is physically removed from the system or | |
1228 | * if the driver module is being unloaded. It frees any resources allocated to | |
1229 | * the device. | |
1230 | * | |
1231 | * Return: 0, always. | |
1232 | */ | |
06b0e683 | 1233 | static int xemaclite_of_remove(struct platform_device *of_dev) |
bb81b2dd JL |
1234 | { |
1235 | struct device *dev = &of_dev->dev; | |
1236 | struct net_device *ndev = dev_get_drvdata(dev); | |
1237 | ||
ece49153 | 1238 | struct net_local *lp = netdev_priv(ndev); |
5cdaaa12 JL |
1239 | |
1240 | /* Un-register the mii_bus, if configured */ | |
1241 | if (lp->has_mdio) { | |
1242 | mdiobus_unregister(lp->mii_bus); | |
1243 | kfree(lp->mii_bus->irq); | |
1244 | mdiobus_free(lp->mii_bus); | |
1245 | lp->mii_bus = NULL; | |
1246 | } | |
1247 | ||
bb81b2dd JL |
1248 | unregister_netdev(ndev); |
1249 | ||
5cdaaa12 JL |
1250 | if (lp->phy_node) |
1251 | of_node_put(lp->phy_node); | |
1252 | lp->phy_node = NULL; | |
1253 | ||
bb81b2dd JL |
1254 | release_mem_region(ndev->mem_start, ndev->mem_end-ndev->mem_start + 1); |
1255 | ||
1256 | xemaclite_remove_ndev(ndev); | |
bb81b2dd JL |
1257 | dev_set_drvdata(dev, NULL); |
1258 | ||
1259 | return 0; | |
1260 | } | |
1261 | ||
357e8b5f MS |
1262 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1263 | static void | |
1264 | xemaclite_poll_controller(struct net_device *ndev) | |
1265 | { | |
1266 | disable_irq(ndev->irq); | |
1267 | xemaclite_interrupt(ndev->irq, ndev); | |
1268 | enable_irq(ndev->irq); | |
1269 | } | |
1270 | #endif | |
1271 | ||
bb81b2dd JL |
1272 | static struct net_device_ops xemaclite_netdev_ops = { |
1273 | .ndo_open = xemaclite_open, | |
1274 | .ndo_stop = xemaclite_close, | |
1275 | .ndo_start_xmit = xemaclite_send, | |
5cdaaa12 | 1276 | .ndo_set_mac_address = xemaclite_set_mac_address, |
bb81b2dd | 1277 | .ndo_tx_timeout = xemaclite_tx_timeout, |
357e8b5f MS |
1278 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1279 | .ndo_poll_controller = xemaclite_poll_controller, | |
1280 | #endif | |
bb81b2dd JL |
1281 | }; |
1282 | ||
1283 | /* Match table for OF platform binding */ | |
06b0e683 | 1284 | static struct of_device_id xemaclite_of_match[] = { |
bb81b2dd JL |
1285 | { .compatible = "xlnx,opb-ethernetlite-1.01.a", }, |
1286 | { .compatible = "xlnx,opb-ethernetlite-1.01.b", }, | |
1287 | { .compatible = "xlnx,xps-ethernetlite-1.00.a", }, | |
1288 | { .compatible = "xlnx,xps-ethernetlite-2.00.a", }, | |
1289 | { .compatible = "xlnx,xps-ethernetlite-2.01.a", }, | |
5cdaaa12 | 1290 | { .compatible = "xlnx,xps-ethernetlite-3.00.a", }, |
bb81b2dd JL |
1291 | { /* end of list */ }, |
1292 | }; | |
1293 | MODULE_DEVICE_TABLE(of, xemaclite_of_match); | |
1294 | ||
74888760 | 1295 | static struct platform_driver xemaclite_of_driver = { |
4018294b GL |
1296 | .driver = { |
1297 | .name = DRIVER_NAME, | |
1298 | .owner = THIS_MODULE, | |
1299 | .of_match_table = xemaclite_of_match, | |
1300 | }, | |
bb81b2dd | 1301 | .probe = xemaclite_of_probe, |
06b0e683 | 1302 | .remove = xemaclite_of_remove, |
bb81b2dd JL |
1303 | }; |
1304 | ||
db62f684 | 1305 | module_platform_driver(xemaclite_of_driver); |
bb81b2dd JL |
1306 | |
1307 | MODULE_AUTHOR("Xilinx, Inc."); | |
1308 | MODULE_DESCRIPTION("Xilinx Ethernet MAC Lite driver"); | |
1309 | MODULE_LICENSE("GPL"); |