1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c)  2018 Intel Corporation */
3 
4 #include <linux/delay.h>
5 
6 #include "igc_hw.h"
7 #include "igc_i225.h"
8 #include "igc_mac.h"
9 #include "igc_base.h"
10 #include "igc.h"
11 
12 /**
13  * igc_reset_hw_base - Reset hardware
14  * @hw: pointer to the HW structure
15  *
16  * This resets the hardware into a known state.  This is a
17  * function pointer entry point called by the api module.
18  */
19 static s32 igc_reset_hw_base(struct igc_hw *hw)
20 {
21 	s32 ret_val;
22 	u32 ctrl;
23 
24 	/* Prevent the PCI-E bus from sticking if there is no TLP connection
25 	 * on the last TLP read/write transaction when MAC is reset.
26 	 */
27 	ret_val = igc_disable_pcie_master(hw);
28 	if (ret_val)
29 		hw_dbg("PCI-E Master disable polling has failed\n");
30 
31 	hw_dbg("Masking off all interrupts\n");
32 	wr32(IGC_IMC, 0xffffffff);
33 
34 	wr32(IGC_RCTL, 0);
35 	wr32(IGC_TCTL, IGC_TCTL_PSP);
36 	wrfl();
37 
38 	usleep_range(10000, 20000);
39 
40 	ctrl = rd32(IGC_CTRL);
41 
42 	hw_dbg("Issuing a global reset to MAC\n");
43 	wr32(IGC_CTRL, ctrl | IGC_CTRL_RST);
44 
45 	ret_val = igc_get_auto_rd_done(hw);
46 	if (ret_val) {
47 		/* When auto config read does not complete, do not
48 		 * return with an error. This can happen in situations
49 		 * where there is no eeprom and prevents getting link.
50 		 */
51 		hw_dbg("Auto Read Done did not complete\n");
52 	}
53 
54 	/* Clear any pending interrupt events. */
55 	wr32(IGC_IMC, 0xffffffff);
56 	rd32(IGC_ICR);
57 
58 	return ret_val;
59 }
60 
61 /**
62  * igc_init_nvm_params_base - Init NVM func ptrs.
63  * @hw: pointer to the HW structure
64  */
65 static s32 igc_init_nvm_params_base(struct igc_hw *hw)
66 {
67 	struct igc_nvm_info *nvm = &hw->nvm;
68 	u32 eecd = rd32(IGC_EECD);
69 	u16 size;
70 
71 	size = (u16)((eecd & IGC_EECD_SIZE_EX_MASK) >>
72 		     IGC_EECD_SIZE_EX_SHIFT);
73 
74 	/* Added to a constant, "size" becomes the left-shift value
75 	 * for setting word_size.
76 	 */
77 	size += NVM_WORD_SIZE_BASE_SHIFT;
78 
79 	/* Just in case size is out of range, cap it to the largest
80 	 * EEPROM size supported
81 	 */
82 	if (size > 15)
83 		size = 15;
84 
85 	nvm->type = igc_nvm_eeprom_spi;
86 	nvm->word_size = BIT(size);
87 	nvm->opcode_bits = 8;
88 	nvm->delay_usec = 1;
89 
90 	nvm->page_size = eecd & IGC_EECD_ADDR_BITS ? 32 : 8;
91 	nvm->address_bits = eecd & IGC_EECD_ADDR_BITS ?
92 			    16 : 8;
93 
94 	if (nvm->word_size == BIT(15))
95 		nvm->page_size = 128;
96 
97 	return 0;
98 }
99 
100 /**
101  * igc_setup_copper_link_base - Configure copper link settings
102  * @hw: pointer to the HW structure
103  *
104  * Configures the link for auto-neg or forced speed and duplex.  Then we check
105  * for link, once link is established calls to configure collision distance
106  * and flow control are called.
107  */
108 static s32 igc_setup_copper_link_base(struct igc_hw *hw)
109 {
110 	s32  ret_val = 0;
111 	u32 ctrl;
112 
113 	ctrl = rd32(IGC_CTRL);
114 	ctrl |= IGC_CTRL_SLU;
115 	ctrl &= ~(IGC_CTRL_FRCSPD | IGC_CTRL_FRCDPX);
116 	wr32(IGC_CTRL, ctrl);
117 
118 	ret_val = igc_setup_copper_link(hw);
119 
120 	return ret_val;
121 }
122 
123 /**
124  * igc_init_mac_params_base - Init MAC func ptrs.
125  * @hw: pointer to the HW structure
126  */
127 static s32 igc_init_mac_params_base(struct igc_hw *hw)
128 {
129 	struct igc_dev_spec_base *dev_spec = &hw->dev_spec._base;
130 	struct igc_mac_info *mac = &hw->mac;
131 
132 	/* Set mta register count */
133 	mac->mta_reg_count = 128;
134 	mac->rar_entry_count = IGC_RAR_ENTRIES;
135 
136 	/* reset */
137 	mac->ops.reset_hw = igc_reset_hw_base;
138 
139 	mac->ops.acquire_swfw_sync = igc_acquire_swfw_sync_i225;
140 	mac->ops.release_swfw_sync = igc_release_swfw_sync_i225;
141 
142 	/* Allow a single clear of the SW semaphore on I225 */
143 	if (mac->type == igc_i225)
144 		dev_spec->clear_semaphore_once = true;
145 
146 	/* physical interface link setup */
147 	mac->ops.setup_physical_interface = igc_setup_copper_link_base;
148 
149 	return 0;
150 }
151 
152 /**
153  * igc_init_phy_params_base - Init PHY func ptrs.
154  * @hw: pointer to the HW structure
155  */
156 static s32 igc_init_phy_params_base(struct igc_hw *hw)
157 {
158 	struct igc_phy_info *phy = &hw->phy;
159 	s32 ret_val = 0;
160 
161 	phy->autoneg_mask	= AUTONEG_ADVERTISE_SPEED_DEFAULT_2500;
162 	phy->reset_delay_us	= 100;
163 
164 	/* set lan id */
165 	hw->bus.func = (rd32(IGC_STATUS) & IGC_STATUS_FUNC_MASK) >>
166 			IGC_STATUS_FUNC_SHIFT;
167 
168 	/* Make sure the PHY is in a good state. Several people have reported
169 	 * firmware leaving the PHY's page select register set to something
170 	 * other than the default of zero, which causes the PHY ID read to
171 	 * access something other than the intended register.
172 	 */
173 	ret_val = hw->phy.ops.reset(hw);
174 	if (ret_val) {
175 		hw_dbg("Error resetting the PHY\n");
176 		goto out;
177 	}
178 
179 	ret_val = igc_get_phy_id(hw);
180 	if (ret_val)
181 		return ret_val;
182 
183 	igc_check_for_copper_link(hw);
184 
185 out:
186 	return ret_val;
187 }
188 
189 static s32 igc_get_invariants_base(struct igc_hw *hw)
190 {
191 	struct igc_mac_info *mac = &hw->mac;
192 	s32 ret_val = 0;
193 
194 	switch (hw->device_id) {
195 	case IGC_DEV_ID_I225_LM:
196 	case IGC_DEV_ID_I225_V:
197 	case IGC_DEV_ID_I225_I:
198 	case IGC_DEV_ID_I220_V:
199 	case IGC_DEV_ID_I225_K:
200 	case IGC_DEV_ID_I225_K2:
201 	case IGC_DEV_ID_I226_K:
202 	case IGC_DEV_ID_I225_LMVP:
203 	case IGC_DEV_ID_I226_LMVP:
204 	case IGC_DEV_ID_I225_IT:
205 	case IGC_DEV_ID_I226_LM:
206 	case IGC_DEV_ID_I226_V:
207 	case IGC_DEV_ID_I226_IT:
208 	case IGC_DEV_ID_I221_V:
209 	case IGC_DEV_ID_I226_BLANK_NVM:
210 	case IGC_DEV_ID_I225_BLANK_NVM:
211 		mac->type = igc_i225;
212 		break;
213 	default:
214 		return -IGC_ERR_MAC_INIT;
215 	}
216 
217 	hw->phy.media_type = igc_media_type_copper;
218 
219 	/* mac initialization and operations */
220 	ret_val = igc_init_mac_params_base(hw);
221 	if (ret_val)
222 		goto out;
223 
224 	/* NVM initialization */
225 	ret_val = igc_init_nvm_params_base(hw);
226 	switch (hw->mac.type) {
227 	case igc_i225:
228 		ret_val = igc_init_nvm_params_i225(hw);
229 		break;
230 	default:
231 		break;
232 	}
233 
234 	/* setup PHY parameters */
235 	ret_val = igc_init_phy_params_base(hw);
236 	if (ret_val)
237 		goto out;
238 
239 out:
240 	return ret_val;
241 }
242 
243 /**
244  * igc_acquire_phy_base - Acquire rights to access PHY
245  * @hw: pointer to the HW structure
246  *
247  * Acquire access rights to the correct PHY.  This is a
248  * function pointer entry point called by the api module.
249  */
250 static s32 igc_acquire_phy_base(struct igc_hw *hw)
251 {
252 	u16 mask = IGC_SWFW_PHY0_SM;
253 
254 	return hw->mac.ops.acquire_swfw_sync(hw, mask);
255 }
256 
257 /**
258  * igc_release_phy_base - Release rights to access PHY
259  * @hw: pointer to the HW structure
260  *
261  * A wrapper to release access rights to the correct PHY.  This is a
262  * function pointer entry point called by the api module.
263  */
264 static void igc_release_phy_base(struct igc_hw *hw)
265 {
266 	u16 mask = IGC_SWFW_PHY0_SM;
267 
268 	hw->mac.ops.release_swfw_sync(hw, mask);
269 }
270 
271 /**
272  * igc_init_hw_base - Initialize hardware
273  * @hw: pointer to the HW structure
274  *
275  * This inits the hardware readying it for operation.
276  */
277 static s32 igc_init_hw_base(struct igc_hw *hw)
278 {
279 	struct igc_mac_info *mac = &hw->mac;
280 	u16 i, rar_count = mac->rar_entry_count;
281 	s32 ret_val = 0;
282 
283 	/* Setup the receive address */
284 	igc_init_rx_addrs(hw, rar_count);
285 
286 	/* Zero out the Multicast HASH table */
287 	hw_dbg("Zeroing the MTA\n");
288 	for (i = 0; i < mac->mta_reg_count; i++)
289 		array_wr32(IGC_MTA, i, 0);
290 
291 	/* Zero out the Unicast HASH table */
292 	hw_dbg("Zeroing the UTA\n");
293 	for (i = 0; i < mac->uta_reg_count; i++)
294 		array_wr32(IGC_UTA, i, 0);
295 
296 	/* Setup link and flow control */
297 	ret_val = igc_setup_link(hw);
298 
299 	/* Clear all of the statistics registers (clear on read).  It is
300 	 * important that we do this after we have tried to establish link
301 	 * because the symbol error count will increment wildly if there
302 	 * is no link.
303 	 */
304 	igc_clear_hw_cntrs_base(hw);
305 
306 	return ret_val;
307 }
308 
309 /**
310  * igc_power_down_phy_copper_base - Remove link during PHY power down
311  * @hw: pointer to the HW structure
312  *
313  * In the case of a PHY power down to save power, or to turn off link during a
314  * driver unload, or wake on lan is not enabled, remove the link.
315  */
316 void igc_power_down_phy_copper_base(struct igc_hw *hw)
317 {
318 	/* If the management interface is not enabled, then power down */
319 	if (!(igc_enable_mng_pass_thru(hw) || igc_check_reset_block(hw)))
320 		igc_power_down_phy_copper(hw);
321 }
322 
323 /**
324  * igc_rx_fifo_flush_base - Clean rx fifo after Rx enable
325  * @hw: pointer to the HW structure
326  *
327  * After Rx enable, if manageability is enabled then there is likely some
328  * bad data at the start of the fifo and possibly in the DMA fifo.  This
329  * function clears the fifos and flushes any packets that came in as rx was
330  * being enabled.
331  */
332 void igc_rx_fifo_flush_base(struct igc_hw *hw)
333 {
334 	u32 rctl, rlpml, rxdctl[4], rfctl, temp_rctl, rx_enabled;
335 	int i, ms_wait;
336 
337 	/* disable IPv6 options as per hardware errata */
338 	rfctl = rd32(IGC_RFCTL);
339 	rfctl |= IGC_RFCTL_IPV6_EX_DIS;
340 	wr32(IGC_RFCTL, rfctl);
341 
342 	if (!(rd32(IGC_MANC) & IGC_MANC_RCV_TCO_EN))
343 		return;
344 
345 	/* Disable all Rx queues */
346 	for (i = 0; i < 4; i++) {
347 		rxdctl[i] = rd32(IGC_RXDCTL(i));
348 		wr32(IGC_RXDCTL(i),
349 		     rxdctl[i] & ~IGC_RXDCTL_QUEUE_ENABLE);
350 	}
351 	/* Poll all queues to verify they have shut down */
352 	for (ms_wait = 0; ms_wait < 10; ms_wait++) {
353 		usleep_range(1000, 2000);
354 		rx_enabled = 0;
355 		for (i = 0; i < 4; i++)
356 			rx_enabled |= rd32(IGC_RXDCTL(i));
357 		if (!(rx_enabled & IGC_RXDCTL_QUEUE_ENABLE))
358 			break;
359 	}
360 
361 	if (ms_wait == 10)
362 		hw_dbg("Queue disable timed out after 10ms\n");
363 
364 	/* Clear RLPML, RCTL.SBP, RFCTL.LEF, and set RCTL.LPE so that all
365 	 * incoming packets are rejected.  Set enable and wait 2ms so that
366 	 * any packet that was coming in as RCTL.EN was set is flushed
367 	 */
368 	wr32(IGC_RFCTL, rfctl & ~IGC_RFCTL_LEF);
369 
370 	rlpml = rd32(IGC_RLPML);
371 	wr32(IGC_RLPML, 0);
372 
373 	rctl = rd32(IGC_RCTL);
374 	temp_rctl = rctl & ~(IGC_RCTL_EN | IGC_RCTL_SBP);
375 	temp_rctl |= IGC_RCTL_LPE;
376 
377 	wr32(IGC_RCTL, temp_rctl);
378 	wr32(IGC_RCTL, temp_rctl | IGC_RCTL_EN);
379 	wrfl();
380 	usleep_range(2000, 3000);
381 
382 	/* Enable Rx queues that were previously enabled and restore our
383 	 * previous state
384 	 */
385 	for (i = 0; i < 4; i++)
386 		wr32(IGC_RXDCTL(i), rxdctl[i]);
387 	wr32(IGC_RCTL, rctl);
388 	wrfl();
389 
390 	wr32(IGC_RLPML, rlpml);
391 	wr32(IGC_RFCTL, rfctl);
392 
393 	/* Flush receive errors generated by workaround */
394 	rd32(IGC_ROC);
395 	rd32(IGC_RNBC);
396 	rd32(IGC_MPC);
397 }
398 
399 bool igc_is_device_id_i225(struct igc_hw *hw)
400 {
401 	switch (hw->device_id) {
402 	case IGC_DEV_ID_I225_LM:
403 	case IGC_DEV_ID_I225_V:
404 	case IGC_DEV_ID_I225_I:
405 	case IGC_DEV_ID_I225_K:
406 	case IGC_DEV_ID_I225_K2:
407 	case IGC_DEV_ID_I225_LMVP:
408 	case IGC_DEV_ID_I225_IT:
409 		return true;
410 	default:
411 		return false;
412 	}
413 }
414 
415 bool igc_is_device_id_i226(struct igc_hw *hw)
416 {
417 	switch (hw->device_id) {
418 	case IGC_DEV_ID_I226_LM:
419 	case IGC_DEV_ID_I226_V:
420 	case IGC_DEV_ID_I226_K:
421 	case IGC_DEV_ID_I226_IT:
422 		return true;
423 	default:
424 		return false;
425 	}
426 }
427 
428 static struct igc_mac_operations igc_mac_ops_base = {
429 	.init_hw		= igc_init_hw_base,
430 	.check_for_link		= igc_check_for_copper_link,
431 	.rar_set		= igc_rar_set,
432 	.read_mac_addr		= igc_read_mac_addr,
433 	.get_speed_and_duplex	= igc_get_speed_and_duplex_copper,
434 };
435 
436 static const struct igc_phy_operations igc_phy_ops_base = {
437 	.acquire		= igc_acquire_phy_base,
438 	.release		= igc_release_phy_base,
439 	.reset			= igc_phy_hw_reset,
440 	.read_reg		= igc_read_phy_reg_gpy,
441 	.write_reg		= igc_write_phy_reg_gpy,
442 };
443 
444 const struct igc_info igc_base_info = {
445 	.get_invariants		= igc_get_invariants_base,
446 	.mac_ops		= &igc_mac_ops_base,
447 	.phy_ops		= &igc_phy_ops_base,
448 };
449