xref: /openbmc/linux/drivers/net/ethernet/nxp/lpc_eth.c (revision f029c781)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * drivers/net/ethernet/nxp/lpc_eth.c
4  *
5  * Author: Kevin Wells <kevin.wells@nxp.com>
6  *
7  * Copyright (C) 2010 NXP Semiconductors
8  * Copyright (C) 2012 Roland Stigge <stigge@antcom.de>
9  */
10 
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 
13 #include <linux/clk.h>
14 #include <linux/crc32.h>
15 #include <linux/etherdevice.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/of_mdio.h>
19 #include <linux/of_net.h>
20 #include <linux/phy.h>
21 #include <linux/platform_device.h>
22 #include <linux/spinlock.h>
23 #include <linux/soc/nxp/lpc32xx-misc.h>
24 
25 #define MODNAME "lpc-eth"
26 #define DRV_VERSION "1.00"
27 
28 #define ENET_MAXF_SIZE 1536
29 #define ENET_RX_DESC 48
30 #define ENET_TX_DESC 16
31 
32 #define NAPI_WEIGHT 16
33 
34 /*
35  * Ethernet MAC controller Register offsets
36  */
37 #define LPC_ENET_MAC1(x)			(x + 0x000)
38 #define LPC_ENET_MAC2(x)			(x + 0x004)
39 #define LPC_ENET_IPGT(x)			(x + 0x008)
40 #define LPC_ENET_IPGR(x)			(x + 0x00C)
41 #define LPC_ENET_CLRT(x)			(x + 0x010)
42 #define LPC_ENET_MAXF(x)			(x + 0x014)
43 #define LPC_ENET_SUPP(x)			(x + 0x018)
44 #define LPC_ENET_TEST(x)			(x + 0x01C)
45 #define LPC_ENET_MCFG(x)			(x + 0x020)
46 #define LPC_ENET_MCMD(x)			(x + 0x024)
47 #define LPC_ENET_MADR(x)			(x + 0x028)
48 #define LPC_ENET_MWTD(x)			(x + 0x02C)
49 #define LPC_ENET_MRDD(x)			(x + 0x030)
50 #define LPC_ENET_MIND(x)			(x + 0x034)
51 #define LPC_ENET_SA0(x)				(x + 0x040)
52 #define LPC_ENET_SA1(x)				(x + 0x044)
53 #define LPC_ENET_SA2(x)				(x + 0x048)
54 #define LPC_ENET_COMMAND(x)			(x + 0x100)
55 #define LPC_ENET_STATUS(x)			(x + 0x104)
56 #define LPC_ENET_RXDESCRIPTOR(x)		(x + 0x108)
57 #define LPC_ENET_RXSTATUS(x)			(x + 0x10C)
58 #define LPC_ENET_RXDESCRIPTORNUMBER(x)		(x + 0x110)
59 #define LPC_ENET_RXPRODUCEINDEX(x)		(x + 0x114)
60 #define LPC_ENET_RXCONSUMEINDEX(x)		(x + 0x118)
61 #define LPC_ENET_TXDESCRIPTOR(x)		(x + 0x11C)
62 #define LPC_ENET_TXSTATUS(x)			(x + 0x120)
63 #define LPC_ENET_TXDESCRIPTORNUMBER(x)		(x + 0x124)
64 #define LPC_ENET_TXPRODUCEINDEX(x)		(x + 0x128)
65 #define LPC_ENET_TXCONSUMEINDEX(x)		(x + 0x12C)
66 #define LPC_ENET_TSV0(x)			(x + 0x158)
67 #define LPC_ENET_TSV1(x)			(x + 0x15C)
68 #define LPC_ENET_RSV(x)				(x + 0x160)
69 #define LPC_ENET_FLOWCONTROLCOUNTER(x)		(x + 0x170)
70 #define LPC_ENET_FLOWCONTROLSTATUS(x)		(x + 0x174)
71 #define LPC_ENET_RXFILTER_CTRL(x)		(x + 0x200)
72 #define LPC_ENET_RXFILTERWOLSTATUS(x)		(x + 0x204)
73 #define LPC_ENET_RXFILTERWOLCLEAR(x)		(x + 0x208)
74 #define LPC_ENET_HASHFILTERL(x)			(x + 0x210)
75 #define LPC_ENET_HASHFILTERH(x)			(x + 0x214)
76 #define LPC_ENET_INTSTATUS(x)			(x + 0xFE0)
77 #define LPC_ENET_INTENABLE(x)			(x + 0xFE4)
78 #define LPC_ENET_INTCLEAR(x)			(x + 0xFE8)
79 #define LPC_ENET_INTSET(x)			(x + 0xFEC)
80 #define LPC_ENET_POWERDOWN(x)			(x + 0xFF4)
81 
82 /*
83  * mac1 register definitions
84  */
85 #define LPC_MAC1_RECV_ENABLE			(1 << 0)
86 #define LPC_MAC1_PASS_ALL_RX_FRAMES		(1 << 1)
87 #define LPC_MAC1_RX_FLOW_CONTROL		(1 << 2)
88 #define LPC_MAC1_TX_FLOW_CONTROL		(1 << 3)
89 #define LPC_MAC1_LOOPBACK			(1 << 4)
90 #define LPC_MAC1_RESET_TX			(1 << 8)
91 #define LPC_MAC1_RESET_MCS_TX			(1 << 9)
92 #define LPC_MAC1_RESET_RX			(1 << 10)
93 #define LPC_MAC1_RESET_MCS_RX			(1 << 11)
94 #define LPC_MAC1_SIMULATION_RESET		(1 << 14)
95 #define LPC_MAC1_SOFT_RESET			(1 << 15)
96 
97 /*
98  * mac2 register definitions
99  */
100 #define LPC_MAC2_FULL_DUPLEX			(1 << 0)
101 #define LPC_MAC2_FRAME_LENGTH_CHECKING		(1 << 1)
102 #define LPC_MAC2_HUGH_LENGTH_CHECKING		(1 << 2)
103 #define LPC_MAC2_DELAYED_CRC			(1 << 3)
104 #define LPC_MAC2_CRC_ENABLE			(1 << 4)
105 #define LPC_MAC2_PAD_CRC_ENABLE			(1 << 5)
106 #define LPC_MAC2_VLAN_PAD_ENABLE		(1 << 6)
107 #define LPC_MAC2_AUTO_DETECT_PAD_ENABLE		(1 << 7)
108 #define LPC_MAC2_PURE_PREAMBLE_ENFORCEMENT	(1 << 8)
109 #define LPC_MAC2_LONG_PREAMBLE_ENFORCEMENT	(1 << 9)
110 #define LPC_MAC2_NO_BACKOFF			(1 << 12)
111 #define LPC_MAC2_BACK_PRESSURE			(1 << 13)
112 #define LPC_MAC2_EXCESS_DEFER			(1 << 14)
113 
114 /*
115  * ipgt register definitions
116  */
117 #define LPC_IPGT_LOAD(n)			((n) & 0x7F)
118 
119 /*
120  * ipgr register definitions
121  */
122 #define LPC_IPGR_LOAD_PART2(n)			((n) & 0x7F)
123 #define LPC_IPGR_LOAD_PART1(n)			(((n) & 0x7F) << 8)
124 
125 /*
126  * clrt register definitions
127  */
128 #define LPC_CLRT_LOAD_RETRY_MAX(n)		((n) & 0xF)
129 #define LPC_CLRT_LOAD_COLLISION_WINDOW(n)	(((n) & 0x3F) << 8)
130 
131 /*
132  * maxf register definitions
133  */
134 #define LPC_MAXF_LOAD_MAX_FRAME_LEN(n)		((n) & 0xFFFF)
135 
136 /*
137  * supp register definitions
138  */
139 #define LPC_SUPP_SPEED				(1 << 8)
140 #define LPC_SUPP_RESET_RMII			(1 << 11)
141 
142 /*
143  * test register definitions
144  */
145 #define LPC_TEST_SHORTCUT_PAUSE_QUANTA		(1 << 0)
146 #define LPC_TEST_PAUSE				(1 << 1)
147 #define LPC_TEST_BACKPRESSURE			(1 << 2)
148 
149 /*
150  * mcfg register definitions
151  */
152 #define LPC_MCFG_SCAN_INCREMENT			(1 << 0)
153 #define LPC_MCFG_SUPPRESS_PREAMBLE		(1 << 1)
154 #define LPC_MCFG_CLOCK_SELECT(n)		(((n) & 0x7) << 2)
155 #define LPC_MCFG_CLOCK_HOST_DIV_4		0
156 #define LPC_MCFG_CLOCK_HOST_DIV_6		2
157 #define LPC_MCFG_CLOCK_HOST_DIV_8		3
158 #define LPC_MCFG_CLOCK_HOST_DIV_10		4
159 #define LPC_MCFG_CLOCK_HOST_DIV_14		5
160 #define LPC_MCFG_CLOCK_HOST_DIV_20		6
161 #define LPC_MCFG_CLOCK_HOST_DIV_28		7
162 #define LPC_MCFG_RESET_MII_MGMT			(1 << 15)
163 
164 /*
165  * mcmd register definitions
166  */
167 #define LPC_MCMD_READ				(1 << 0)
168 #define LPC_MCMD_SCAN				(1 << 1)
169 
170 /*
171  * madr register definitions
172  */
173 #define LPC_MADR_REGISTER_ADDRESS(n)		((n) & 0x1F)
174 #define LPC_MADR_PHY_0ADDRESS(n)		(((n) & 0x1F) << 8)
175 
176 /*
177  * mwtd register definitions
178  */
179 #define LPC_MWDT_WRITE(n)			((n) & 0xFFFF)
180 
181 /*
182  * mrdd register definitions
183  */
184 #define LPC_MRDD_READ_MASK			0xFFFF
185 
186 /*
187  * mind register definitions
188  */
189 #define LPC_MIND_BUSY				(1 << 0)
190 #define LPC_MIND_SCANNING			(1 << 1)
191 #define LPC_MIND_NOT_VALID			(1 << 2)
192 #define LPC_MIND_MII_LINK_FAIL			(1 << 3)
193 
194 /*
195  * command register definitions
196  */
197 #define LPC_COMMAND_RXENABLE			(1 << 0)
198 #define LPC_COMMAND_TXENABLE			(1 << 1)
199 #define LPC_COMMAND_REG_RESET			(1 << 3)
200 #define LPC_COMMAND_TXRESET			(1 << 4)
201 #define LPC_COMMAND_RXRESET			(1 << 5)
202 #define LPC_COMMAND_PASSRUNTFRAME		(1 << 6)
203 #define LPC_COMMAND_PASSRXFILTER		(1 << 7)
204 #define LPC_COMMAND_TXFLOWCONTROL		(1 << 8)
205 #define LPC_COMMAND_RMII			(1 << 9)
206 #define LPC_COMMAND_FULLDUPLEX			(1 << 10)
207 
208 /*
209  * status register definitions
210  */
211 #define LPC_STATUS_RXACTIVE			(1 << 0)
212 #define LPC_STATUS_TXACTIVE			(1 << 1)
213 
214 /*
215  * tsv0 register definitions
216  */
217 #define LPC_TSV0_CRC_ERROR			(1 << 0)
218 #define LPC_TSV0_LENGTH_CHECK_ERROR		(1 << 1)
219 #define LPC_TSV0_LENGTH_OUT_OF_RANGE		(1 << 2)
220 #define LPC_TSV0_DONE				(1 << 3)
221 #define LPC_TSV0_MULTICAST			(1 << 4)
222 #define LPC_TSV0_BROADCAST			(1 << 5)
223 #define LPC_TSV0_PACKET_DEFER			(1 << 6)
224 #define LPC_TSV0_ESCESSIVE_DEFER		(1 << 7)
225 #define LPC_TSV0_ESCESSIVE_COLLISION		(1 << 8)
226 #define LPC_TSV0_LATE_COLLISION			(1 << 9)
227 #define LPC_TSV0_GIANT				(1 << 10)
228 #define LPC_TSV0_UNDERRUN			(1 << 11)
229 #define LPC_TSV0_TOTAL_BYTES(n)			(((n) >> 12) & 0xFFFF)
230 #define LPC_TSV0_CONTROL_FRAME			(1 << 28)
231 #define LPC_TSV0_PAUSE				(1 << 29)
232 #define LPC_TSV0_BACKPRESSURE			(1 << 30)
233 #define LPC_TSV0_VLAN				(1 << 31)
234 
235 /*
236  * tsv1 register definitions
237  */
238 #define LPC_TSV1_TRANSMIT_BYTE_COUNT(n)		((n) & 0xFFFF)
239 #define LPC_TSV1_COLLISION_COUNT(n)		(((n) >> 16) & 0xF)
240 
241 /*
242  * rsv register definitions
243  */
244 #define LPC_RSV_RECEIVED_BYTE_COUNT(n)		((n) & 0xFFFF)
245 #define LPC_RSV_RXDV_EVENT_IGNORED		(1 << 16)
246 #define LPC_RSV_RXDV_EVENT_PREVIOUSLY_SEEN	(1 << 17)
247 #define LPC_RSV_CARRIER_EVNT_PREVIOUS_SEEN	(1 << 18)
248 #define LPC_RSV_RECEIVE_CODE_VIOLATION		(1 << 19)
249 #define LPC_RSV_CRC_ERROR			(1 << 20)
250 #define LPC_RSV_LENGTH_CHECK_ERROR		(1 << 21)
251 #define LPC_RSV_LENGTH_OUT_OF_RANGE		(1 << 22)
252 #define LPC_RSV_RECEIVE_OK			(1 << 23)
253 #define LPC_RSV_MULTICAST			(1 << 24)
254 #define LPC_RSV_BROADCAST			(1 << 25)
255 #define LPC_RSV_DRIBBLE_NIBBLE			(1 << 26)
256 #define LPC_RSV_CONTROL_FRAME			(1 << 27)
257 #define LPC_RSV_PAUSE				(1 << 28)
258 #define LPC_RSV_UNSUPPORTED_OPCODE		(1 << 29)
259 #define LPC_RSV_VLAN				(1 << 30)
260 
261 /*
262  * flowcontrolcounter register definitions
263  */
264 #define LPC_FCCR_MIRRORCOUNTER(n)		((n) & 0xFFFF)
265 #define LPC_FCCR_PAUSETIMER(n)			(((n) >> 16) & 0xFFFF)
266 
267 /*
268  * flowcontrolstatus register definitions
269  */
270 #define LPC_FCCR_MIRRORCOUNTERCURRENT(n)	((n) & 0xFFFF)
271 
272 /*
273  * rxfilterctrl, rxfilterwolstatus, and rxfilterwolclear shared
274  * register definitions
275  */
276 #define LPC_RXFLTRW_ACCEPTUNICAST		(1 << 0)
277 #define LPC_RXFLTRW_ACCEPTUBROADCAST		(1 << 1)
278 #define LPC_RXFLTRW_ACCEPTUMULTICAST		(1 << 2)
279 #define LPC_RXFLTRW_ACCEPTUNICASTHASH		(1 << 3)
280 #define LPC_RXFLTRW_ACCEPTUMULTICASTHASH	(1 << 4)
281 #define LPC_RXFLTRW_ACCEPTPERFECT		(1 << 5)
282 
283 /*
284  * rxfilterctrl register definitions
285  */
286 #define LPC_RXFLTRWSTS_MAGICPACKETENWOL		(1 << 12)
287 #define LPC_RXFLTRWSTS_RXFILTERENWOL		(1 << 13)
288 
289 /*
290  * rxfilterwolstatus/rxfilterwolclear register definitions
291  */
292 #define LPC_RXFLTRWSTS_RXFILTERWOL		(1 << 7)
293 #define LPC_RXFLTRWSTS_MAGICPACKETWOL		(1 << 8)
294 
295 /*
296  * intstatus, intenable, intclear, and Intset shared register
297  * definitions
298  */
299 #define LPC_MACINT_RXOVERRUNINTEN		(1 << 0)
300 #define LPC_MACINT_RXERRORONINT			(1 << 1)
301 #define LPC_MACINT_RXFINISHEDINTEN		(1 << 2)
302 #define LPC_MACINT_RXDONEINTEN			(1 << 3)
303 #define LPC_MACINT_TXUNDERRUNINTEN		(1 << 4)
304 #define LPC_MACINT_TXERRORINTEN			(1 << 5)
305 #define LPC_MACINT_TXFINISHEDINTEN		(1 << 6)
306 #define LPC_MACINT_TXDONEINTEN			(1 << 7)
307 #define LPC_MACINT_SOFTINTEN			(1 << 12)
308 #define LPC_MACINT_WAKEUPINTEN			(1 << 13)
309 
310 /*
311  * powerdown register definitions
312  */
313 #define LPC_POWERDOWN_MACAHB			(1 << 31)
314 
lpc_phy_interface_mode(struct device * dev)315 static phy_interface_t lpc_phy_interface_mode(struct device *dev)
316 {
317 	if (dev && dev->of_node) {
318 		const char *mode = of_get_property(dev->of_node,
319 						   "phy-mode", NULL);
320 		if (mode && !strcmp(mode, "mii"))
321 			return PHY_INTERFACE_MODE_MII;
322 	}
323 	return PHY_INTERFACE_MODE_RMII;
324 }
325 
use_iram_for_net(struct device * dev)326 static bool use_iram_for_net(struct device *dev)
327 {
328 	if (dev && dev->of_node)
329 		return of_property_read_bool(dev->of_node, "use-iram");
330 	return false;
331 }
332 
333 /* Receive Status information word */
334 #define RXSTATUS_SIZE			0x000007FF
335 #define RXSTATUS_CONTROL		(1 << 18)
336 #define RXSTATUS_VLAN			(1 << 19)
337 #define RXSTATUS_FILTER			(1 << 20)
338 #define RXSTATUS_MULTICAST		(1 << 21)
339 #define RXSTATUS_BROADCAST		(1 << 22)
340 #define RXSTATUS_CRC			(1 << 23)
341 #define RXSTATUS_SYMBOL			(1 << 24)
342 #define RXSTATUS_LENGTH			(1 << 25)
343 #define RXSTATUS_RANGE			(1 << 26)
344 #define RXSTATUS_ALIGN			(1 << 27)
345 #define RXSTATUS_OVERRUN		(1 << 28)
346 #define RXSTATUS_NODESC			(1 << 29)
347 #define RXSTATUS_LAST			(1 << 30)
348 #define RXSTATUS_ERROR			(1 << 31)
349 
350 #define RXSTATUS_STATUS_ERROR \
351 	(RXSTATUS_NODESC | RXSTATUS_OVERRUN | RXSTATUS_ALIGN | \
352 	 RXSTATUS_RANGE | RXSTATUS_LENGTH | RXSTATUS_SYMBOL | RXSTATUS_CRC)
353 
354 /* Receive Descriptor control word */
355 #define RXDESC_CONTROL_SIZE		0x000007FF
356 #define RXDESC_CONTROL_INT		(1 << 31)
357 
358 /* Transmit Status information word */
359 #define TXSTATUS_COLLISIONS_GET(x)	(((x) >> 21) & 0xF)
360 #define TXSTATUS_DEFER			(1 << 25)
361 #define TXSTATUS_EXCESSDEFER		(1 << 26)
362 #define TXSTATUS_EXCESSCOLL		(1 << 27)
363 #define TXSTATUS_LATECOLL		(1 << 28)
364 #define TXSTATUS_UNDERRUN		(1 << 29)
365 #define TXSTATUS_NODESC			(1 << 30)
366 #define TXSTATUS_ERROR			(1 << 31)
367 
368 /* Transmit Descriptor control word */
369 #define TXDESC_CONTROL_SIZE		0x000007FF
370 #define TXDESC_CONTROL_OVERRIDE		(1 << 26)
371 #define TXDESC_CONTROL_HUGE		(1 << 27)
372 #define TXDESC_CONTROL_PAD		(1 << 28)
373 #define TXDESC_CONTROL_CRC		(1 << 29)
374 #define TXDESC_CONTROL_LAST		(1 << 30)
375 #define TXDESC_CONTROL_INT		(1 << 31)
376 
377 /*
378  * Structure of a TX/RX descriptors and RX status
379  */
380 struct txrx_desc_t {
381 	__le32 packet;
382 	__le32 control;
383 };
384 struct rx_status_t {
385 	__le32 statusinfo;
386 	__le32 statushashcrc;
387 };
388 
389 /*
390  * Device driver data structure
391  */
392 struct netdata_local {
393 	struct platform_device	*pdev;
394 	struct net_device	*ndev;
395 	struct device_node	*phy_node;
396 	spinlock_t		lock;
397 	void __iomem		*net_base;
398 	u32			msg_enable;
399 	unsigned int		skblen[ENET_TX_DESC];
400 	unsigned int		last_tx_idx;
401 	unsigned int		num_used_tx_buffs;
402 	struct mii_bus		*mii_bus;
403 	struct clk		*clk;
404 	dma_addr_t		dma_buff_base_p;
405 	void			*dma_buff_base_v;
406 	size_t			dma_buff_size;
407 	struct txrx_desc_t	*tx_desc_v;
408 	u32			*tx_stat_v;
409 	void			*tx_buff_v;
410 	struct txrx_desc_t	*rx_desc_v;
411 	struct rx_status_t	*rx_stat_v;
412 	void			*rx_buff_v;
413 	int			link;
414 	int			speed;
415 	int			duplex;
416 	struct napi_struct	napi;
417 };
418 
419 /*
420  * MAC support functions
421  */
__lpc_set_mac(struct netdata_local * pldat,const u8 * mac)422 static void __lpc_set_mac(struct netdata_local *pldat, const u8 *mac)
423 {
424 	u32 tmp;
425 
426 	/* Set station address */
427 	tmp = mac[0] | ((u32)mac[1] << 8);
428 	writel(tmp, LPC_ENET_SA2(pldat->net_base));
429 	tmp = mac[2] | ((u32)mac[3] << 8);
430 	writel(tmp, LPC_ENET_SA1(pldat->net_base));
431 	tmp = mac[4] | ((u32)mac[5] << 8);
432 	writel(tmp, LPC_ENET_SA0(pldat->net_base));
433 
434 	netdev_dbg(pldat->ndev, "Ethernet MAC address %pM\n", mac);
435 }
436 
__lpc_get_mac(struct netdata_local * pldat,u8 * mac)437 static void __lpc_get_mac(struct netdata_local *pldat, u8 *mac)
438 {
439 	u32 tmp;
440 
441 	/* Get station address */
442 	tmp = readl(LPC_ENET_SA2(pldat->net_base));
443 	mac[0] = tmp & 0xFF;
444 	mac[1] = tmp >> 8;
445 	tmp = readl(LPC_ENET_SA1(pldat->net_base));
446 	mac[2] = tmp & 0xFF;
447 	mac[3] = tmp >> 8;
448 	tmp = readl(LPC_ENET_SA0(pldat->net_base));
449 	mac[4] = tmp & 0xFF;
450 	mac[5] = tmp >> 8;
451 }
452 
__lpc_params_setup(struct netdata_local * pldat)453 static void __lpc_params_setup(struct netdata_local *pldat)
454 {
455 	u32 tmp;
456 
457 	if (pldat->duplex == DUPLEX_FULL) {
458 		tmp = readl(LPC_ENET_MAC2(pldat->net_base));
459 		tmp |= LPC_MAC2_FULL_DUPLEX;
460 		writel(tmp, LPC_ENET_MAC2(pldat->net_base));
461 		tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
462 		tmp |= LPC_COMMAND_FULLDUPLEX;
463 		writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
464 		writel(LPC_IPGT_LOAD(0x15), LPC_ENET_IPGT(pldat->net_base));
465 	} else {
466 		tmp = readl(LPC_ENET_MAC2(pldat->net_base));
467 		tmp &= ~LPC_MAC2_FULL_DUPLEX;
468 		writel(tmp, LPC_ENET_MAC2(pldat->net_base));
469 		tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
470 		tmp &= ~LPC_COMMAND_FULLDUPLEX;
471 		writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
472 		writel(LPC_IPGT_LOAD(0x12), LPC_ENET_IPGT(pldat->net_base));
473 	}
474 
475 	if (pldat->speed == SPEED_100)
476 		writel(LPC_SUPP_SPEED, LPC_ENET_SUPP(pldat->net_base));
477 	else
478 		writel(0, LPC_ENET_SUPP(pldat->net_base));
479 }
480 
__lpc_eth_reset(struct netdata_local * pldat)481 static void __lpc_eth_reset(struct netdata_local *pldat)
482 {
483 	/* Reset all MAC logic */
484 	writel((LPC_MAC1_RESET_TX | LPC_MAC1_RESET_MCS_TX | LPC_MAC1_RESET_RX |
485 		LPC_MAC1_RESET_MCS_RX | LPC_MAC1_SIMULATION_RESET |
486 		LPC_MAC1_SOFT_RESET), LPC_ENET_MAC1(pldat->net_base));
487 	writel((LPC_COMMAND_REG_RESET | LPC_COMMAND_TXRESET |
488 		LPC_COMMAND_RXRESET), LPC_ENET_COMMAND(pldat->net_base));
489 }
490 
__lpc_mii_mngt_reset(struct netdata_local * pldat)491 static int __lpc_mii_mngt_reset(struct netdata_local *pldat)
492 {
493 	/* Reset MII management hardware */
494 	writel(LPC_MCFG_RESET_MII_MGMT, LPC_ENET_MCFG(pldat->net_base));
495 
496 	/* Setup MII clock to slowest rate with a /28 divider */
497 	writel(LPC_MCFG_CLOCK_SELECT(LPC_MCFG_CLOCK_HOST_DIV_28),
498 	       LPC_ENET_MCFG(pldat->net_base));
499 
500 	return 0;
501 }
502 
__va_to_pa(void * addr,struct netdata_local * pldat)503 static inline phys_addr_t __va_to_pa(void *addr, struct netdata_local *pldat)
504 {
505 	phys_addr_t phaddr;
506 
507 	phaddr = addr - pldat->dma_buff_base_v;
508 	phaddr += pldat->dma_buff_base_p;
509 
510 	return phaddr;
511 }
512 
lpc_eth_enable_int(void __iomem * regbase)513 static void lpc_eth_enable_int(void __iomem *regbase)
514 {
515 	writel((LPC_MACINT_RXDONEINTEN | LPC_MACINT_TXDONEINTEN),
516 	       LPC_ENET_INTENABLE(regbase));
517 }
518 
lpc_eth_disable_int(void __iomem * regbase)519 static void lpc_eth_disable_int(void __iomem *regbase)
520 {
521 	writel(0, LPC_ENET_INTENABLE(regbase));
522 }
523 
524 /* Setup TX/RX descriptors */
__lpc_txrx_desc_setup(struct netdata_local * pldat)525 static void __lpc_txrx_desc_setup(struct netdata_local *pldat)
526 {
527 	u32 *ptxstat;
528 	void *tbuff;
529 	int i;
530 	struct txrx_desc_t *ptxrxdesc;
531 	struct rx_status_t *prxstat;
532 
533 	tbuff = PTR_ALIGN(pldat->dma_buff_base_v, 16);
534 
535 	/* Setup TX descriptors, status, and buffers */
536 	pldat->tx_desc_v = tbuff;
537 	tbuff += sizeof(struct txrx_desc_t) * ENET_TX_DESC;
538 
539 	pldat->tx_stat_v = tbuff;
540 	tbuff += sizeof(u32) * ENET_TX_DESC;
541 
542 	tbuff = PTR_ALIGN(tbuff, 16);
543 	pldat->tx_buff_v = tbuff;
544 	tbuff += ENET_MAXF_SIZE * ENET_TX_DESC;
545 
546 	/* Setup RX descriptors, status, and buffers */
547 	pldat->rx_desc_v = tbuff;
548 	tbuff += sizeof(struct txrx_desc_t) * ENET_RX_DESC;
549 
550 	tbuff = PTR_ALIGN(tbuff, 16);
551 	pldat->rx_stat_v = tbuff;
552 	tbuff += sizeof(struct rx_status_t) * ENET_RX_DESC;
553 
554 	tbuff = PTR_ALIGN(tbuff, 16);
555 	pldat->rx_buff_v = tbuff;
556 	tbuff += ENET_MAXF_SIZE * ENET_RX_DESC;
557 
558 	/* Map the TX descriptors to the TX buffers in hardware */
559 	for (i = 0; i < ENET_TX_DESC; i++) {
560 		ptxstat = &pldat->tx_stat_v[i];
561 		ptxrxdesc = &pldat->tx_desc_v[i];
562 
563 		ptxrxdesc->packet = __va_to_pa(
564 				pldat->tx_buff_v + i * ENET_MAXF_SIZE, pldat);
565 		ptxrxdesc->control = 0;
566 		*ptxstat = 0;
567 	}
568 
569 	/* Map the RX descriptors to the RX buffers in hardware */
570 	for (i = 0; i < ENET_RX_DESC; i++) {
571 		prxstat = &pldat->rx_stat_v[i];
572 		ptxrxdesc = &pldat->rx_desc_v[i];
573 
574 		ptxrxdesc->packet = __va_to_pa(
575 				pldat->rx_buff_v + i * ENET_MAXF_SIZE, pldat);
576 		ptxrxdesc->control = RXDESC_CONTROL_INT | (ENET_MAXF_SIZE - 1);
577 		prxstat->statusinfo = 0;
578 		prxstat->statushashcrc = 0;
579 	}
580 
581 	/* Setup base addresses in hardware to point to buffers and
582 	 * descriptors
583 	 */
584 	writel((ENET_TX_DESC - 1),
585 	       LPC_ENET_TXDESCRIPTORNUMBER(pldat->net_base));
586 	writel(__va_to_pa(pldat->tx_desc_v, pldat),
587 	       LPC_ENET_TXDESCRIPTOR(pldat->net_base));
588 	writel(__va_to_pa(pldat->tx_stat_v, pldat),
589 	       LPC_ENET_TXSTATUS(pldat->net_base));
590 	writel((ENET_RX_DESC - 1),
591 	       LPC_ENET_RXDESCRIPTORNUMBER(pldat->net_base));
592 	writel(__va_to_pa(pldat->rx_desc_v, pldat),
593 	       LPC_ENET_RXDESCRIPTOR(pldat->net_base));
594 	writel(__va_to_pa(pldat->rx_stat_v, pldat),
595 	       LPC_ENET_RXSTATUS(pldat->net_base));
596 }
597 
__lpc_eth_init(struct netdata_local * pldat)598 static void __lpc_eth_init(struct netdata_local *pldat)
599 {
600 	u32 tmp;
601 
602 	/* Disable controller and reset */
603 	tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
604 	tmp &= ~LPC_COMMAND_RXENABLE | LPC_COMMAND_TXENABLE;
605 	writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
606 	tmp = readl(LPC_ENET_MAC1(pldat->net_base));
607 	tmp &= ~LPC_MAC1_RECV_ENABLE;
608 	writel(tmp, LPC_ENET_MAC1(pldat->net_base));
609 
610 	/* Initial MAC setup */
611 	writel(LPC_MAC1_PASS_ALL_RX_FRAMES, LPC_ENET_MAC1(pldat->net_base));
612 	writel((LPC_MAC2_PAD_CRC_ENABLE | LPC_MAC2_CRC_ENABLE),
613 	       LPC_ENET_MAC2(pldat->net_base));
614 	writel(ENET_MAXF_SIZE, LPC_ENET_MAXF(pldat->net_base));
615 
616 	/* Collision window, gap */
617 	writel((LPC_CLRT_LOAD_RETRY_MAX(0xF) |
618 		LPC_CLRT_LOAD_COLLISION_WINDOW(0x37)),
619 	       LPC_ENET_CLRT(pldat->net_base));
620 	writel(LPC_IPGR_LOAD_PART2(0x12), LPC_ENET_IPGR(pldat->net_base));
621 
622 	if (lpc_phy_interface_mode(&pldat->pdev->dev) == PHY_INTERFACE_MODE_MII)
623 		writel(LPC_COMMAND_PASSRUNTFRAME,
624 		       LPC_ENET_COMMAND(pldat->net_base));
625 	else {
626 		writel((LPC_COMMAND_PASSRUNTFRAME | LPC_COMMAND_RMII),
627 		       LPC_ENET_COMMAND(pldat->net_base));
628 		writel(LPC_SUPP_RESET_RMII, LPC_ENET_SUPP(pldat->net_base));
629 	}
630 
631 	__lpc_params_setup(pldat);
632 
633 	/* Setup TX and RX descriptors */
634 	__lpc_txrx_desc_setup(pldat);
635 
636 	/* Setup packet filtering */
637 	writel((LPC_RXFLTRW_ACCEPTUBROADCAST | LPC_RXFLTRW_ACCEPTPERFECT),
638 	       LPC_ENET_RXFILTER_CTRL(pldat->net_base));
639 
640 	/* Get the next TX buffer output index */
641 	pldat->num_used_tx_buffs = 0;
642 	pldat->last_tx_idx =
643 		readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
644 
645 	/* Clear and enable interrupts */
646 	writel(0xFFFF, LPC_ENET_INTCLEAR(pldat->net_base));
647 	smp_wmb();
648 	lpc_eth_enable_int(pldat->net_base);
649 
650 	/* Enable controller */
651 	tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
652 	tmp |= LPC_COMMAND_RXENABLE | LPC_COMMAND_TXENABLE;
653 	writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
654 	tmp = readl(LPC_ENET_MAC1(pldat->net_base));
655 	tmp |= LPC_MAC1_RECV_ENABLE;
656 	writel(tmp, LPC_ENET_MAC1(pldat->net_base));
657 }
658 
__lpc_eth_shutdown(struct netdata_local * pldat)659 static void __lpc_eth_shutdown(struct netdata_local *pldat)
660 {
661 	/* Reset ethernet and power down PHY */
662 	__lpc_eth_reset(pldat);
663 	writel(0, LPC_ENET_MAC1(pldat->net_base));
664 	writel(0, LPC_ENET_MAC2(pldat->net_base));
665 }
666 
667 /*
668  * MAC<--->PHY support functions
669  */
lpc_mdio_read(struct mii_bus * bus,int phy_id,int phyreg)670 static int lpc_mdio_read(struct mii_bus *bus, int phy_id, int phyreg)
671 {
672 	struct netdata_local *pldat = bus->priv;
673 	unsigned long timeout = jiffies + msecs_to_jiffies(100);
674 	int lps;
675 
676 	writel(((phy_id << 8) | phyreg), LPC_ENET_MADR(pldat->net_base));
677 	writel(LPC_MCMD_READ, LPC_ENET_MCMD(pldat->net_base));
678 
679 	/* Wait for unbusy status */
680 	while (readl(LPC_ENET_MIND(pldat->net_base)) & LPC_MIND_BUSY) {
681 		if (time_after(jiffies, timeout))
682 			return -EIO;
683 		cpu_relax();
684 	}
685 
686 	lps = readl(LPC_ENET_MRDD(pldat->net_base));
687 	writel(0, LPC_ENET_MCMD(pldat->net_base));
688 
689 	return lps;
690 }
691 
lpc_mdio_write(struct mii_bus * bus,int phy_id,int phyreg,u16 phydata)692 static int lpc_mdio_write(struct mii_bus *bus, int phy_id, int phyreg,
693 			u16 phydata)
694 {
695 	struct netdata_local *pldat = bus->priv;
696 	unsigned long timeout = jiffies + msecs_to_jiffies(100);
697 
698 	writel(((phy_id << 8) | phyreg), LPC_ENET_MADR(pldat->net_base));
699 	writel(phydata, LPC_ENET_MWTD(pldat->net_base));
700 
701 	/* Wait for completion */
702 	while (readl(LPC_ENET_MIND(pldat->net_base)) & LPC_MIND_BUSY) {
703 		if (time_after(jiffies, timeout))
704 			return -EIO;
705 		cpu_relax();
706 	}
707 
708 	return 0;
709 }
710 
lpc_mdio_reset(struct mii_bus * bus)711 static int lpc_mdio_reset(struct mii_bus *bus)
712 {
713 	return __lpc_mii_mngt_reset((struct netdata_local *)bus->priv);
714 }
715 
lpc_handle_link_change(struct net_device * ndev)716 static void lpc_handle_link_change(struct net_device *ndev)
717 {
718 	struct netdata_local *pldat = netdev_priv(ndev);
719 	struct phy_device *phydev = ndev->phydev;
720 	unsigned long flags;
721 
722 	bool status_change = false;
723 
724 	spin_lock_irqsave(&pldat->lock, flags);
725 
726 	if (phydev->link) {
727 		if ((pldat->speed != phydev->speed) ||
728 		    (pldat->duplex != phydev->duplex)) {
729 			pldat->speed = phydev->speed;
730 			pldat->duplex = phydev->duplex;
731 			status_change = true;
732 		}
733 	}
734 
735 	if (phydev->link != pldat->link) {
736 		if (!phydev->link) {
737 			pldat->speed = 0;
738 			pldat->duplex = -1;
739 		}
740 		pldat->link = phydev->link;
741 
742 		status_change = true;
743 	}
744 
745 	spin_unlock_irqrestore(&pldat->lock, flags);
746 
747 	if (status_change)
748 		__lpc_params_setup(pldat);
749 }
750 
lpc_mii_probe(struct net_device * ndev)751 static int lpc_mii_probe(struct net_device *ndev)
752 {
753 	struct netdata_local *pldat = netdev_priv(ndev);
754 	struct phy_device *phydev;
755 
756 	/* Attach to the PHY */
757 	if (lpc_phy_interface_mode(&pldat->pdev->dev) == PHY_INTERFACE_MODE_MII)
758 		netdev_info(ndev, "using MII interface\n");
759 	else
760 		netdev_info(ndev, "using RMII interface\n");
761 
762 	if (pldat->phy_node)
763 		phydev =  of_phy_find_device(pldat->phy_node);
764 	else
765 		phydev = phy_find_first(pldat->mii_bus);
766 	if (!phydev) {
767 		netdev_err(ndev, "no PHY found\n");
768 		return -ENODEV;
769 	}
770 
771 	phydev = phy_connect(ndev, phydev_name(phydev),
772 			     &lpc_handle_link_change,
773 			     lpc_phy_interface_mode(&pldat->pdev->dev));
774 	if (IS_ERR(phydev)) {
775 		netdev_err(ndev, "Could not attach to PHY\n");
776 		return PTR_ERR(phydev);
777 	}
778 
779 	phy_set_max_speed(phydev, SPEED_100);
780 
781 	pldat->link = 0;
782 	pldat->speed = 0;
783 	pldat->duplex = -1;
784 
785 	phy_attached_info(phydev);
786 
787 	return 0;
788 }
789 
lpc_mii_init(struct netdata_local * pldat)790 static int lpc_mii_init(struct netdata_local *pldat)
791 {
792 	struct device_node *node;
793 	int err = -ENXIO;
794 
795 	pldat->mii_bus = mdiobus_alloc();
796 	if (!pldat->mii_bus) {
797 		err = -ENOMEM;
798 		goto err_out;
799 	}
800 
801 	/* Setup MII mode */
802 	if (lpc_phy_interface_mode(&pldat->pdev->dev) == PHY_INTERFACE_MODE_MII)
803 		writel(LPC_COMMAND_PASSRUNTFRAME,
804 		       LPC_ENET_COMMAND(pldat->net_base));
805 	else {
806 		writel((LPC_COMMAND_PASSRUNTFRAME | LPC_COMMAND_RMII),
807 		       LPC_ENET_COMMAND(pldat->net_base));
808 		writel(LPC_SUPP_RESET_RMII, LPC_ENET_SUPP(pldat->net_base));
809 	}
810 
811 	pldat->mii_bus->name = "lpc_mii_bus";
812 	pldat->mii_bus->read = &lpc_mdio_read;
813 	pldat->mii_bus->write = &lpc_mdio_write;
814 	pldat->mii_bus->reset = &lpc_mdio_reset;
815 	snprintf(pldat->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
816 		 pldat->pdev->name, pldat->pdev->id);
817 	pldat->mii_bus->priv = pldat;
818 	pldat->mii_bus->parent = &pldat->pdev->dev;
819 
820 	node = of_get_child_by_name(pldat->pdev->dev.of_node, "mdio");
821 	err = of_mdiobus_register(pldat->mii_bus, node);
822 	of_node_put(node);
823 	if (err)
824 		goto err_out_unregister_bus;
825 
826 	err = lpc_mii_probe(pldat->ndev);
827 	if (err)
828 		goto err_out_unregister_bus;
829 
830 	return 0;
831 
832 err_out_unregister_bus:
833 	mdiobus_unregister(pldat->mii_bus);
834 	mdiobus_free(pldat->mii_bus);
835 err_out:
836 	return err;
837 }
838 
__lpc_handle_xmit(struct net_device * ndev)839 static void __lpc_handle_xmit(struct net_device *ndev)
840 {
841 	struct netdata_local *pldat = netdev_priv(ndev);
842 	u32 txcidx, *ptxstat, txstat;
843 
844 	txcidx = readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
845 	while (pldat->last_tx_idx != txcidx) {
846 		unsigned int skblen = pldat->skblen[pldat->last_tx_idx];
847 
848 		/* A buffer is available, get buffer status */
849 		ptxstat = &pldat->tx_stat_v[pldat->last_tx_idx];
850 		txstat = *ptxstat;
851 
852 		/* Next buffer and decrement used buffer counter */
853 		pldat->num_used_tx_buffs--;
854 		pldat->last_tx_idx++;
855 		if (pldat->last_tx_idx >= ENET_TX_DESC)
856 			pldat->last_tx_idx = 0;
857 
858 		/* Update collision counter */
859 		ndev->stats.collisions += TXSTATUS_COLLISIONS_GET(txstat);
860 
861 		/* Any errors occurred? */
862 		if (txstat & TXSTATUS_ERROR) {
863 			if (txstat & TXSTATUS_UNDERRUN) {
864 				/* FIFO underrun */
865 				ndev->stats.tx_fifo_errors++;
866 			}
867 			if (txstat & TXSTATUS_LATECOLL) {
868 				/* Late collision */
869 				ndev->stats.tx_aborted_errors++;
870 			}
871 			if (txstat & TXSTATUS_EXCESSCOLL) {
872 				/* Excessive collision */
873 				ndev->stats.tx_aborted_errors++;
874 			}
875 			if (txstat & TXSTATUS_EXCESSDEFER) {
876 				/* Defer limit */
877 				ndev->stats.tx_aborted_errors++;
878 			}
879 			ndev->stats.tx_errors++;
880 		} else {
881 			/* Update stats */
882 			ndev->stats.tx_packets++;
883 			ndev->stats.tx_bytes += skblen;
884 		}
885 
886 		txcidx = readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
887 	}
888 
889 	if (pldat->num_used_tx_buffs <= ENET_TX_DESC/2) {
890 		if (netif_queue_stopped(ndev))
891 			netif_wake_queue(ndev);
892 	}
893 }
894 
__lpc_handle_recv(struct net_device * ndev,int budget)895 static int __lpc_handle_recv(struct net_device *ndev, int budget)
896 {
897 	struct netdata_local *pldat = netdev_priv(ndev);
898 	struct sk_buff *skb;
899 	u32 rxconsidx, len, ethst;
900 	struct rx_status_t *prxstat;
901 	int rx_done = 0;
902 
903 	/* Get the current RX buffer indexes */
904 	rxconsidx = readl(LPC_ENET_RXCONSUMEINDEX(pldat->net_base));
905 	while (rx_done < budget && rxconsidx !=
906 			readl(LPC_ENET_RXPRODUCEINDEX(pldat->net_base))) {
907 		/* Get pointer to receive status */
908 		prxstat = &pldat->rx_stat_v[rxconsidx];
909 		len = (prxstat->statusinfo & RXSTATUS_SIZE) + 1;
910 
911 		/* Status error? */
912 		ethst = prxstat->statusinfo;
913 		if ((ethst & (RXSTATUS_ERROR | RXSTATUS_STATUS_ERROR)) ==
914 		    (RXSTATUS_ERROR | RXSTATUS_RANGE))
915 			ethst &= ~RXSTATUS_ERROR;
916 
917 		if (ethst & RXSTATUS_ERROR) {
918 			int si = prxstat->statusinfo;
919 			/* Check statuses */
920 			if (si & RXSTATUS_OVERRUN) {
921 				/* Overrun error */
922 				ndev->stats.rx_fifo_errors++;
923 			} else if (si & RXSTATUS_CRC) {
924 				/* CRC error */
925 				ndev->stats.rx_crc_errors++;
926 			} else if (si & RXSTATUS_LENGTH) {
927 				/* Length error */
928 				ndev->stats.rx_length_errors++;
929 			} else if (si & RXSTATUS_ERROR) {
930 				/* Other error */
931 				ndev->stats.rx_length_errors++;
932 			}
933 			ndev->stats.rx_errors++;
934 		} else {
935 			/* Packet is good */
936 			skb = dev_alloc_skb(len);
937 			if (!skb) {
938 				ndev->stats.rx_dropped++;
939 			} else {
940 				/* Copy packet from buffer */
941 				skb_put_data(skb,
942 					     pldat->rx_buff_v + rxconsidx * ENET_MAXF_SIZE,
943 					     len);
944 
945 				/* Pass to upper layer */
946 				skb->protocol = eth_type_trans(skb, ndev);
947 				netif_receive_skb(skb);
948 				ndev->stats.rx_packets++;
949 				ndev->stats.rx_bytes += len;
950 			}
951 		}
952 
953 		/* Increment consume index */
954 		rxconsidx = rxconsidx + 1;
955 		if (rxconsidx >= ENET_RX_DESC)
956 			rxconsidx = 0;
957 		writel(rxconsidx,
958 		       LPC_ENET_RXCONSUMEINDEX(pldat->net_base));
959 		rx_done++;
960 	}
961 
962 	return rx_done;
963 }
964 
lpc_eth_poll(struct napi_struct * napi,int budget)965 static int lpc_eth_poll(struct napi_struct *napi, int budget)
966 {
967 	struct netdata_local *pldat = container_of(napi,
968 			struct netdata_local, napi);
969 	struct net_device *ndev = pldat->ndev;
970 	int rx_done = 0;
971 	struct netdev_queue *txq = netdev_get_tx_queue(ndev, 0);
972 
973 	__netif_tx_lock(txq, smp_processor_id());
974 	__lpc_handle_xmit(ndev);
975 	__netif_tx_unlock(txq);
976 	rx_done = __lpc_handle_recv(ndev, budget);
977 
978 	if (rx_done < budget) {
979 		napi_complete_done(napi, rx_done);
980 		lpc_eth_enable_int(pldat->net_base);
981 	}
982 
983 	return rx_done;
984 }
985 
__lpc_eth_interrupt(int irq,void * dev_id)986 static irqreturn_t __lpc_eth_interrupt(int irq, void *dev_id)
987 {
988 	struct net_device *ndev = dev_id;
989 	struct netdata_local *pldat = netdev_priv(ndev);
990 	u32 tmp;
991 
992 	spin_lock(&pldat->lock);
993 
994 	tmp = readl(LPC_ENET_INTSTATUS(pldat->net_base));
995 	/* Clear interrupts */
996 	writel(tmp, LPC_ENET_INTCLEAR(pldat->net_base));
997 
998 	lpc_eth_disable_int(pldat->net_base);
999 	if (likely(napi_schedule_prep(&pldat->napi)))
1000 		__napi_schedule(&pldat->napi);
1001 
1002 	spin_unlock(&pldat->lock);
1003 
1004 	return IRQ_HANDLED;
1005 }
1006 
lpc_eth_close(struct net_device * ndev)1007 static int lpc_eth_close(struct net_device *ndev)
1008 {
1009 	unsigned long flags;
1010 	struct netdata_local *pldat = netdev_priv(ndev);
1011 
1012 	if (netif_msg_ifdown(pldat))
1013 		dev_dbg(&pldat->pdev->dev, "shutting down %s\n", ndev->name);
1014 
1015 	napi_disable(&pldat->napi);
1016 	netif_stop_queue(ndev);
1017 
1018 	spin_lock_irqsave(&pldat->lock, flags);
1019 	__lpc_eth_reset(pldat);
1020 	netif_carrier_off(ndev);
1021 	writel(0, LPC_ENET_MAC1(pldat->net_base));
1022 	writel(0, LPC_ENET_MAC2(pldat->net_base));
1023 	spin_unlock_irqrestore(&pldat->lock, flags);
1024 
1025 	if (ndev->phydev)
1026 		phy_stop(ndev->phydev);
1027 	clk_disable_unprepare(pldat->clk);
1028 
1029 	return 0;
1030 }
1031 
lpc_eth_hard_start_xmit(struct sk_buff * skb,struct net_device * ndev)1032 static netdev_tx_t lpc_eth_hard_start_xmit(struct sk_buff *skb,
1033 					   struct net_device *ndev)
1034 {
1035 	struct netdata_local *pldat = netdev_priv(ndev);
1036 	u32 len, txidx;
1037 	u32 *ptxstat;
1038 	struct txrx_desc_t *ptxrxdesc;
1039 
1040 	len = skb->len;
1041 
1042 	spin_lock_irq(&pldat->lock);
1043 
1044 	if (pldat->num_used_tx_buffs >= (ENET_TX_DESC - 1)) {
1045 		/* This function should never be called when there are no
1046 		 * buffers
1047 		 */
1048 		netif_stop_queue(ndev);
1049 		spin_unlock_irq(&pldat->lock);
1050 		WARN(1, "BUG! TX request when no free TX buffers!\n");
1051 		return NETDEV_TX_BUSY;
1052 	}
1053 
1054 	/* Get the next TX descriptor index */
1055 	txidx = readl(LPC_ENET_TXPRODUCEINDEX(pldat->net_base));
1056 
1057 	/* Setup control for the transfer */
1058 	ptxstat = &pldat->tx_stat_v[txidx];
1059 	*ptxstat = 0;
1060 	ptxrxdesc = &pldat->tx_desc_v[txidx];
1061 	ptxrxdesc->control =
1062 		(len - 1) | TXDESC_CONTROL_LAST | TXDESC_CONTROL_INT;
1063 
1064 	/* Copy data to the DMA buffer */
1065 	memcpy(pldat->tx_buff_v + txidx * ENET_MAXF_SIZE, skb->data, len);
1066 
1067 	/* Save the buffer and increment the buffer counter */
1068 	pldat->skblen[txidx] = len;
1069 	pldat->num_used_tx_buffs++;
1070 
1071 	/* Start transmit */
1072 	txidx++;
1073 	if (txidx >= ENET_TX_DESC)
1074 		txidx = 0;
1075 	writel(txidx, LPC_ENET_TXPRODUCEINDEX(pldat->net_base));
1076 
1077 	/* Stop queue if no more TX buffers */
1078 	if (pldat->num_used_tx_buffs >= (ENET_TX_DESC - 1))
1079 		netif_stop_queue(ndev);
1080 
1081 	spin_unlock_irq(&pldat->lock);
1082 
1083 	dev_kfree_skb(skb);
1084 	return NETDEV_TX_OK;
1085 }
1086 
lpc_set_mac_address(struct net_device * ndev,void * p)1087 static int lpc_set_mac_address(struct net_device *ndev, void *p)
1088 {
1089 	struct sockaddr *addr = p;
1090 	struct netdata_local *pldat = netdev_priv(ndev);
1091 	unsigned long flags;
1092 
1093 	if (!is_valid_ether_addr(addr->sa_data))
1094 		return -EADDRNOTAVAIL;
1095 	eth_hw_addr_set(ndev, addr->sa_data);
1096 
1097 	spin_lock_irqsave(&pldat->lock, flags);
1098 
1099 	/* Set station address */
1100 	__lpc_set_mac(pldat, ndev->dev_addr);
1101 
1102 	spin_unlock_irqrestore(&pldat->lock, flags);
1103 
1104 	return 0;
1105 }
1106 
lpc_eth_set_multicast_list(struct net_device * ndev)1107 static void lpc_eth_set_multicast_list(struct net_device *ndev)
1108 {
1109 	struct netdata_local *pldat = netdev_priv(ndev);
1110 	struct netdev_hw_addr_list *mcptr = &ndev->mc;
1111 	struct netdev_hw_addr *ha;
1112 	u32 tmp32, hash_val, hashlo, hashhi;
1113 	unsigned long flags;
1114 
1115 	spin_lock_irqsave(&pldat->lock, flags);
1116 
1117 	/* Set station address */
1118 	__lpc_set_mac(pldat, ndev->dev_addr);
1119 
1120 	tmp32 =  LPC_RXFLTRW_ACCEPTUBROADCAST | LPC_RXFLTRW_ACCEPTPERFECT;
1121 
1122 	if (ndev->flags & IFF_PROMISC)
1123 		tmp32 |= LPC_RXFLTRW_ACCEPTUNICAST |
1124 			LPC_RXFLTRW_ACCEPTUMULTICAST;
1125 	if (ndev->flags & IFF_ALLMULTI)
1126 		tmp32 |= LPC_RXFLTRW_ACCEPTUMULTICAST;
1127 
1128 	if (netdev_hw_addr_list_count(mcptr))
1129 		tmp32 |= LPC_RXFLTRW_ACCEPTUMULTICASTHASH;
1130 
1131 	writel(tmp32, LPC_ENET_RXFILTER_CTRL(pldat->net_base));
1132 
1133 
1134 	/* Set initial hash table */
1135 	hashlo = 0x0;
1136 	hashhi = 0x0;
1137 
1138 	/* 64 bits : multicast address in hash table */
1139 	netdev_hw_addr_list_for_each(ha, mcptr) {
1140 		hash_val = (ether_crc(6, ha->addr) >> 23) & 0x3F;
1141 
1142 		if (hash_val >= 32)
1143 			hashhi |= 1 << (hash_val - 32);
1144 		else
1145 			hashlo |= 1 << hash_val;
1146 	}
1147 
1148 	writel(hashlo, LPC_ENET_HASHFILTERL(pldat->net_base));
1149 	writel(hashhi, LPC_ENET_HASHFILTERH(pldat->net_base));
1150 
1151 	spin_unlock_irqrestore(&pldat->lock, flags);
1152 }
1153 
lpc_eth_open(struct net_device * ndev)1154 static int lpc_eth_open(struct net_device *ndev)
1155 {
1156 	struct netdata_local *pldat = netdev_priv(ndev);
1157 	int ret;
1158 
1159 	if (netif_msg_ifup(pldat))
1160 		dev_dbg(&pldat->pdev->dev, "enabling %s\n", ndev->name);
1161 
1162 	ret = clk_prepare_enable(pldat->clk);
1163 	if (ret)
1164 		return ret;
1165 
1166 	/* Suspended PHY makes LPC ethernet core block, so resume now */
1167 	phy_resume(ndev->phydev);
1168 
1169 	/* Reset and initialize */
1170 	__lpc_eth_reset(pldat);
1171 	__lpc_eth_init(pldat);
1172 
1173 	/* schedule a link state check */
1174 	phy_start(ndev->phydev);
1175 	netif_start_queue(ndev);
1176 	napi_enable(&pldat->napi);
1177 
1178 	return 0;
1179 }
1180 
1181 /*
1182  * Ethtool ops
1183  */
lpc_eth_ethtool_getdrvinfo(struct net_device * ndev,struct ethtool_drvinfo * info)1184 static void lpc_eth_ethtool_getdrvinfo(struct net_device *ndev,
1185 	struct ethtool_drvinfo *info)
1186 {
1187 	strscpy(info->driver, MODNAME, sizeof(info->driver));
1188 	strscpy(info->version, DRV_VERSION, sizeof(info->version));
1189 	strscpy(info->bus_info, dev_name(ndev->dev.parent),
1190 		sizeof(info->bus_info));
1191 }
1192 
lpc_eth_ethtool_getmsglevel(struct net_device * ndev)1193 static u32 lpc_eth_ethtool_getmsglevel(struct net_device *ndev)
1194 {
1195 	struct netdata_local *pldat = netdev_priv(ndev);
1196 
1197 	return pldat->msg_enable;
1198 }
1199 
lpc_eth_ethtool_setmsglevel(struct net_device * ndev,u32 level)1200 static void lpc_eth_ethtool_setmsglevel(struct net_device *ndev, u32 level)
1201 {
1202 	struct netdata_local *pldat = netdev_priv(ndev);
1203 
1204 	pldat->msg_enable = level;
1205 }
1206 
1207 static const struct ethtool_ops lpc_eth_ethtool_ops = {
1208 	.get_drvinfo	= lpc_eth_ethtool_getdrvinfo,
1209 	.get_msglevel	= lpc_eth_ethtool_getmsglevel,
1210 	.set_msglevel	= lpc_eth_ethtool_setmsglevel,
1211 	.get_link	= ethtool_op_get_link,
1212 	.get_link_ksettings = phy_ethtool_get_link_ksettings,
1213 	.set_link_ksettings = phy_ethtool_set_link_ksettings,
1214 };
1215 
1216 static const struct net_device_ops lpc_netdev_ops = {
1217 	.ndo_open		= lpc_eth_open,
1218 	.ndo_stop		= lpc_eth_close,
1219 	.ndo_start_xmit		= lpc_eth_hard_start_xmit,
1220 	.ndo_set_rx_mode	= lpc_eth_set_multicast_list,
1221 	.ndo_eth_ioctl		= phy_do_ioctl_running,
1222 	.ndo_set_mac_address	= lpc_set_mac_address,
1223 	.ndo_validate_addr	= eth_validate_addr,
1224 };
1225 
lpc_eth_drv_probe(struct platform_device * pdev)1226 static int lpc_eth_drv_probe(struct platform_device *pdev)
1227 {
1228 	struct device *dev = &pdev->dev;
1229 	struct device_node *np = dev->of_node;
1230 	struct netdata_local *pldat;
1231 	struct net_device *ndev;
1232 	dma_addr_t dma_handle;
1233 	struct resource *res;
1234 	u8 addr[ETH_ALEN];
1235 	int irq, ret;
1236 
1237 	/* Setup network interface for RMII or MII mode */
1238 	lpc32xx_set_phy_interface_mode(lpc_phy_interface_mode(dev));
1239 
1240 	/* Get platform resources */
1241 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1242 	irq = platform_get_irq(pdev, 0);
1243 	if (!res || irq < 0) {
1244 		dev_err(dev, "error getting resources.\n");
1245 		ret = -ENXIO;
1246 		goto err_exit;
1247 	}
1248 
1249 	/* Allocate net driver data structure */
1250 	ndev = alloc_etherdev(sizeof(struct netdata_local));
1251 	if (!ndev) {
1252 		dev_err(dev, "could not allocate device.\n");
1253 		ret = -ENOMEM;
1254 		goto err_exit;
1255 	}
1256 
1257 	SET_NETDEV_DEV(ndev, dev);
1258 
1259 	pldat = netdev_priv(ndev);
1260 	pldat->pdev = pdev;
1261 	pldat->ndev = ndev;
1262 
1263 	spin_lock_init(&pldat->lock);
1264 
1265 	/* Save resources */
1266 	ndev->irq = irq;
1267 
1268 	/* Get clock for the device */
1269 	pldat->clk = clk_get(dev, NULL);
1270 	if (IS_ERR(pldat->clk)) {
1271 		dev_err(dev, "error getting clock.\n");
1272 		ret = PTR_ERR(pldat->clk);
1273 		goto err_out_free_dev;
1274 	}
1275 
1276 	/* Enable network clock */
1277 	ret = clk_prepare_enable(pldat->clk);
1278 	if (ret)
1279 		goto err_out_clk_put;
1280 
1281 	/* Map IO space */
1282 	pldat->net_base = ioremap(res->start, resource_size(res));
1283 	if (!pldat->net_base) {
1284 		dev_err(dev, "failed to map registers\n");
1285 		ret = -ENOMEM;
1286 		goto err_out_disable_clocks;
1287 	}
1288 	ret = request_irq(ndev->irq, __lpc_eth_interrupt, 0,
1289 			  ndev->name, ndev);
1290 	if (ret) {
1291 		dev_err(dev, "error requesting interrupt.\n");
1292 		goto err_out_iounmap;
1293 	}
1294 
1295 	/* Setup driver functions */
1296 	ndev->netdev_ops = &lpc_netdev_ops;
1297 	ndev->ethtool_ops = &lpc_eth_ethtool_ops;
1298 	ndev->watchdog_timeo = msecs_to_jiffies(2500);
1299 
1300 	/* Get size of DMA buffers/descriptors region */
1301 	pldat->dma_buff_size = (ENET_TX_DESC + ENET_RX_DESC) * (ENET_MAXF_SIZE +
1302 		sizeof(struct txrx_desc_t) + sizeof(struct rx_status_t));
1303 
1304 	if (use_iram_for_net(dev)) {
1305 		if (pldat->dma_buff_size >
1306 		    lpc32xx_return_iram(&pldat->dma_buff_base_v, &dma_handle)) {
1307 			pldat->dma_buff_base_v = NULL;
1308 			pldat->dma_buff_size = 0;
1309 			netdev_err(ndev,
1310 				"IRAM not big enough for net buffers, using SDRAM instead.\n");
1311 		}
1312 	}
1313 
1314 	if (pldat->dma_buff_base_v == NULL) {
1315 		ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
1316 		if (ret)
1317 			goto err_out_free_irq;
1318 
1319 		pldat->dma_buff_size = PAGE_ALIGN(pldat->dma_buff_size);
1320 
1321 		/* Allocate a chunk of memory for the DMA ethernet buffers
1322 		 * and descriptors
1323 		 */
1324 		pldat->dma_buff_base_v =
1325 			dma_alloc_coherent(dev,
1326 					   pldat->dma_buff_size, &dma_handle,
1327 					   GFP_KERNEL);
1328 		if (pldat->dma_buff_base_v == NULL) {
1329 			ret = -ENOMEM;
1330 			goto err_out_free_irq;
1331 		}
1332 	}
1333 	pldat->dma_buff_base_p = dma_handle;
1334 
1335 	netdev_dbg(ndev, "IO address space     :%pR\n", res);
1336 	netdev_dbg(ndev, "IO address size      :%zd\n",
1337 			(size_t)resource_size(res));
1338 	netdev_dbg(ndev, "IO address (mapped)  :0x%p\n",
1339 			pldat->net_base);
1340 	netdev_dbg(ndev, "IRQ number           :%d\n", ndev->irq);
1341 	netdev_dbg(ndev, "DMA buffer size      :%zd\n", pldat->dma_buff_size);
1342 	netdev_dbg(ndev, "DMA buffer P address :%pad\n",
1343 			&pldat->dma_buff_base_p);
1344 	netdev_dbg(ndev, "DMA buffer V address :0x%p\n",
1345 			pldat->dma_buff_base_v);
1346 
1347 	pldat->phy_node = of_parse_phandle(np, "phy-handle", 0);
1348 
1349 	/* Get MAC address from current HW setting (POR state is all zeros) */
1350 	__lpc_get_mac(pldat, addr);
1351 	eth_hw_addr_set(ndev, addr);
1352 
1353 	if (!is_valid_ether_addr(ndev->dev_addr)) {
1354 		of_get_ethdev_address(np, ndev);
1355 	}
1356 	if (!is_valid_ether_addr(ndev->dev_addr))
1357 		eth_hw_addr_random(ndev);
1358 
1359 	/* then shut everything down to save power */
1360 	__lpc_eth_shutdown(pldat);
1361 
1362 	/* Set default parameters */
1363 	pldat->msg_enable = NETIF_MSG_LINK;
1364 
1365 	/* Force an MII interface reset and clock setup */
1366 	__lpc_mii_mngt_reset(pldat);
1367 
1368 	/* Force default PHY interface setup in chip, this will probably be
1369 	 * changed by the PHY driver
1370 	 */
1371 	pldat->link = 0;
1372 	pldat->speed = 100;
1373 	pldat->duplex = DUPLEX_FULL;
1374 	__lpc_params_setup(pldat);
1375 
1376 	netif_napi_add_weight(ndev, &pldat->napi, lpc_eth_poll, NAPI_WEIGHT);
1377 
1378 	ret = register_netdev(ndev);
1379 	if (ret) {
1380 		dev_err(dev, "Cannot register net device, aborting.\n");
1381 		goto err_out_dma_unmap;
1382 	}
1383 	platform_set_drvdata(pdev, ndev);
1384 
1385 	ret = lpc_mii_init(pldat);
1386 	if (ret)
1387 		goto err_out_unregister_netdev;
1388 
1389 	netdev_info(ndev, "LPC mac at 0x%08lx irq %d\n",
1390 	       (unsigned long)res->start, ndev->irq);
1391 
1392 	device_init_wakeup(dev, 1);
1393 	device_set_wakeup_enable(dev, 0);
1394 
1395 	return 0;
1396 
1397 err_out_unregister_netdev:
1398 	unregister_netdev(ndev);
1399 err_out_dma_unmap:
1400 	if (!use_iram_for_net(dev) ||
1401 	    pldat->dma_buff_size > lpc32xx_return_iram(NULL, NULL))
1402 		dma_free_coherent(dev, pldat->dma_buff_size,
1403 				  pldat->dma_buff_base_v,
1404 				  pldat->dma_buff_base_p);
1405 err_out_free_irq:
1406 	free_irq(ndev->irq, ndev);
1407 err_out_iounmap:
1408 	iounmap(pldat->net_base);
1409 err_out_disable_clocks:
1410 	clk_disable_unprepare(pldat->clk);
1411 err_out_clk_put:
1412 	clk_put(pldat->clk);
1413 err_out_free_dev:
1414 	free_netdev(ndev);
1415 err_exit:
1416 	pr_err("%s: not found (%d).\n", MODNAME, ret);
1417 	return ret;
1418 }
1419 
lpc_eth_drv_remove(struct platform_device * pdev)1420 static int lpc_eth_drv_remove(struct platform_device *pdev)
1421 {
1422 	struct net_device *ndev = platform_get_drvdata(pdev);
1423 	struct netdata_local *pldat = netdev_priv(ndev);
1424 
1425 	unregister_netdev(ndev);
1426 
1427 	if (!use_iram_for_net(&pldat->pdev->dev) ||
1428 	    pldat->dma_buff_size > lpc32xx_return_iram(NULL, NULL))
1429 		dma_free_coherent(&pldat->pdev->dev, pldat->dma_buff_size,
1430 				  pldat->dma_buff_base_v,
1431 				  pldat->dma_buff_base_p);
1432 	free_irq(ndev->irq, ndev);
1433 	iounmap(pldat->net_base);
1434 	mdiobus_unregister(pldat->mii_bus);
1435 	mdiobus_free(pldat->mii_bus);
1436 	clk_disable_unprepare(pldat->clk);
1437 	clk_put(pldat->clk);
1438 	free_netdev(ndev);
1439 
1440 	return 0;
1441 }
1442 
1443 #ifdef CONFIG_PM
lpc_eth_drv_suspend(struct platform_device * pdev,pm_message_t state)1444 static int lpc_eth_drv_suspend(struct platform_device *pdev,
1445 	pm_message_t state)
1446 {
1447 	struct net_device *ndev = platform_get_drvdata(pdev);
1448 	struct netdata_local *pldat = netdev_priv(ndev);
1449 
1450 	if (device_may_wakeup(&pdev->dev))
1451 		enable_irq_wake(ndev->irq);
1452 
1453 	if (ndev) {
1454 		if (netif_running(ndev)) {
1455 			netif_device_detach(ndev);
1456 			__lpc_eth_shutdown(pldat);
1457 			clk_disable_unprepare(pldat->clk);
1458 
1459 			/*
1460 			 * Reset again now clock is disable to be sure
1461 			 * EMC_MDC is down
1462 			 */
1463 			__lpc_eth_reset(pldat);
1464 		}
1465 	}
1466 
1467 	return 0;
1468 }
1469 
lpc_eth_drv_resume(struct platform_device * pdev)1470 static int lpc_eth_drv_resume(struct platform_device *pdev)
1471 {
1472 	struct net_device *ndev = platform_get_drvdata(pdev);
1473 	struct netdata_local *pldat;
1474 	int ret;
1475 
1476 	if (device_may_wakeup(&pdev->dev))
1477 		disable_irq_wake(ndev->irq);
1478 
1479 	if (ndev) {
1480 		if (netif_running(ndev)) {
1481 			pldat = netdev_priv(ndev);
1482 
1483 			/* Enable interface clock */
1484 			ret = clk_enable(pldat->clk);
1485 			if (ret)
1486 				return ret;
1487 
1488 			/* Reset and initialize */
1489 			__lpc_eth_reset(pldat);
1490 			__lpc_eth_init(pldat);
1491 
1492 			netif_device_attach(ndev);
1493 		}
1494 	}
1495 
1496 	return 0;
1497 }
1498 #endif
1499 
1500 static const struct of_device_id lpc_eth_match[] = {
1501 	{ .compatible = "nxp,lpc-eth" },
1502 	{ }
1503 };
1504 MODULE_DEVICE_TABLE(of, lpc_eth_match);
1505 
1506 static struct platform_driver lpc_eth_driver = {
1507 	.probe		= lpc_eth_drv_probe,
1508 	.remove		= lpc_eth_drv_remove,
1509 #ifdef CONFIG_PM
1510 	.suspend	= lpc_eth_drv_suspend,
1511 	.resume		= lpc_eth_drv_resume,
1512 #endif
1513 	.driver		= {
1514 		.name	= MODNAME,
1515 		.of_match_table = lpc_eth_match,
1516 	},
1517 };
1518 
1519 module_platform_driver(lpc_eth_driver);
1520 
1521 MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
1522 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
1523 MODULE_DESCRIPTION("LPC Ethernet Driver");
1524 MODULE_LICENSE("GPL");
1525