1
/*******************************************************************************
3
Intel(R) Gigabit Ethernet Linux driver
4
Copyright(c) 2007-2011 Intel Corporation.
6
This program is free software; you can redistribute it and/or modify it
7
under the terms and conditions of the GNU General Public License,
8
version 2, as published by the Free Software Foundation.
10
This program is distributed in the hope it will be useful, but WITHOUT
11
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15
You should have received a copy of the GNU General Public License along with
16
this program; if not, write to the Free Software Foundation, Inc.,
17
51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19
The full GNU General Public License is included in this distribution in
20
the file called "COPYING".
23
e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
24
Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26
*******************************************************************************/
28
#include <linux/if_ether.h>
29
#include <linux/delay.h>
30
#include <linux/pci.h>
31
#include <linux/netdevice.h>
32
#include <linux/etherdevice.h>
34
#include "e1000_mac.h"
38
static s32 igb_set_default_fc(struct e1000_hw *hw);
39
static s32 igb_set_fc_watermarks(struct e1000_hw *hw);
42
* igb_get_bus_info_pcie - Get PCIe bus information
43
* @hw: pointer to the HW structure
45
* Determines and stores the system bus information for a particular
46
* network interface. The following bus information is determined and stored:
47
* bus speed, bus width, type (PCIe), and PCIe function.
49
s32 igb_get_bus_info_pcie(struct e1000_hw *hw)
51
struct e1000_bus_info *bus = &hw->bus;
56
bus->type = e1000_bus_type_pci_express;
58
ret_val = igb_read_pcie_cap_reg(hw,
62
bus->width = e1000_bus_width_unknown;
63
bus->speed = e1000_bus_speed_unknown;
65
switch (pcie_link_status & PCI_EXP_LNKSTA_CLS) {
66
case PCI_EXP_LNKSTA_CLS_2_5GB:
67
bus->speed = e1000_bus_speed_2500;
69
case PCI_EXP_LNKSTA_CLS_5_0GB:
70
bus->speed = e1000_bus_speed_5000;
73
bus->speed = e1000_bus_speed_unknown;
77
bus->width = (enum e1000_bus_width)((pcie_link_status &
78
PCI_EXP_LNKSTA_NLW) >>
79
PCI_EXP_LNKSTA_NLW_SHIFT);
82
reg = rd32(E1000_STATUS);
83
bus->func = (reg & E1000_STATUS_FUNC_MASK) >> E1000_STATUS_FUNC_SHIFT;
89
* igb_clear_vfta - Clear VLAN filter table
90
* @hw: pointer to the HW structure
92
* Clears the register array which contains the VLAN filter table by
93
* setting all the values to 0.
95
void igb_clear_vfta(struct e1000_hw *hw)
99
for (offset = 0; offset < E1000_VLAN_FILTER_TBL_SIZE; offset++) {
100
array_wr32(E1000_VFTA, offset, 0);
106
* igb_write_vfta - Write value to VLAN filter table
107
* @hw: pointer to the HW structure
108
* @offset: register offset in VLAN filter table
109
* @value: register value written to VLAN filter table
111
* Writes value at the given offset in the register array which stores
112
* the VLAN filter table.
114
static void igb_write_vfta(struct e1000_hw *hw, u32 offset, u32 value)
116
array_wr32(E1000_VFTA, offset, value);
120
/* Due to a hw errata, if the host tries to configure the VFTA register
121
* while performing queries from the BMC or DMA, then the VFTA in some
122
* cases won't be written.
126
* igb_clear_vfta_i350 - Clear VLAN filter table
127
* @hw: pointer to the HW structure
129
* Clears the register array which contains the VLAN filter table by
130
* setting all the values to 0.
132
void igb_clear_vfta_i350(struct e1000_hw *hw)
137
for (offset = 0; offset < E1000_VLAN_FILTER_TBL_SIZE; offset++) {
138
for (i = 0; i < 10; i++)
139
array_wr32(E1000_VFTA, offset, 0);
146
* igb_write_vfta_i350 - Write value to VLAN filter table
147
* @hw: pointer to the HW structure
148
* @offset: register offset in VLAN filter table
149
* @value: register value written to VLAN filter table
151
* Writes value at the given offset in the register array which stores
152
* the VLAN filter table.
154
void igb_write_vfta_i350(struct e1000_hw *hw, u32 offset, u32 value)
158
for (i = 0; i < 10; i++)
159
array_wr32(E1000_VFTA, offset, value);
165
* igb_init_rx_addrs - Initialize receive address's
166
* @hw: pointer to the HW structure
167
* @rar_count: receive address registers
169
* Setups the receive address registers by setting the base receive address
170
* register to the devices MAC address and clearing all the other receive
171
* address registers to 0.
173
void igb_init_rx_addrs(struct e1000_hw *hw, u16 rar_count)
176
u8 mac_addr[ETH_ALEN] = {0};
178
/* Setup the receive address */
179
hw_dbg("Programming MAC Address into RAR[0]\n");
181
hw->mac.ops.rar_set(hw, hw->mac.addr, 0);
183
/* Zero out the other (rar_entry_count - 1) receive addresses */
184
hw_dbg("Clearing RAR[1-%u]\n", rar_count-1);
185
for (i = 1; i < rar_count; i++)
186
hw->mac.ops.rar_set(hw, mac_addr, i);
190
* igb_vfta_set - enable or disable vlan in VLAN filter table
191
* @hw: pointer to the HW structure
192
* @vid: VLAN id to add or remove
193
* @add: if true add filter, if false remove
195
* Sets or clears a bit in the VLAN filter table array based on VLAN id
196
* and if we are adding or removing the filter
198
s32 igb_vfta_set(struct e1000_hw *hw, u32 vid, bool add)
200
u32 index = (vid >> E1000_VFTA_ENTRY_SHIFT) & E1000_VFTA_ENTRY_MASK;
201
u32 mask = 1 << (vid & E1000_VFTA_ENTRY_BIT_SHIFT_MASK);
203
struct igb_adapter *adapter = hw->back;
206
vfta = adapter->shadow_vfta[index];
208
/* bit was set/cleared before we started */
209
if ((!!(vfta & mask)) == add) {
210
ret_val = -E1000_ERR_CONFIG;
217
if (hw->mac.type == e1000_i350)
218
igb_write_vfta_i350(hw, index, vfta);
220
igb_write_vfta(hw, index, vfta);
221
adapter->shadow_vfta[index] = vfta;
227
* igb_check_alt_mac_addr - Check for alternate MAC addr
228
* @hw: pointer to the HW structure
230
* Checks the nvm for an alternate MAC address. An alternate MAC address
231
* can be setup by pre-boot software and must be treated like a permanent
232
* address and must override the actual permanent MAC address. If an
233
* alternate MAC address is fopund it is saved in the hw struct and
234
* prgrammed into RAR0 and the cuntion returns success, otherwise the
235
* function returns an error.
237
s32 igb_check_alt_mac_addr(struct e1000_hw *hw)
241
u16 offset, nvm_alt_mac_addr_offset, nvm_data;
242
u8 alt_mac_addr[ETH_ALEN];
245
* Alternate MAC address is handled by the option ROM for 82580
246
* and newer. SW support not required.
248
if (hw->mac.type >= e1000_82580)
251
ret_val = hw->nvm.ops.read(hw, NVM_ALT_MAC_ADDR_PTR, 1,
252
&nvm_alt_mac_addr_offset);
254
hw_dbg("NVM Read Error\n");
258
if ((nvm_alt_mac_addr_offset == 0xFFFF) ||
259
(nvm_alt_mac_addr_offset == 0x0000))
260
/* There is no Alternate MAC Address */
263
if (hw->bus.func == E1000_FUNC_1)
264
nvm_alt_mac_addr_offset += E1000_ALT_MAC_ADDRESS_OFFSET_LAN1;
265
if (hw->bus.func == E1000_FUNC_2)
266
nvm_alt_mac_addr_offset += E1000_ALT_MAC_ADDRESS_OFFSET_LAN2;
268
if (hw->bus.func == E1000_FUNC_3)
269
nvm_alt_mac_addr_offset += E1000_ALT_MAC_ADDRESS_OFFSET_LAN3;
270
for (i = 0; i < ETH_ALEN; i += 2) {
271
offset = nvm_alt_mac_addr_offset + (i >> 1);
272
ret_val = hw->nvm.ops.read(hw, offset, 1, &nvm_data);
274
hw_dbg("NVM Read Error\n");
278
alt_mac_addr[i] = (u8)(nvm_data & 0xFF);
279
alt_mac_addr[i + 1] = (u8)(nvm_data >> 8);
282
/* if multicast bit is set, the alternate address will not be used */
283
if (is_multicast_ether_addr(alt_mac_addr)) {
284
hw_dbg("Ignoring Alternate Mac Address with MC bit set\n");
289
* We have a valid alternate MAC address, and we want to treat it the
290
* same as the normal permanent MAC address stored by the HW into the
291
* RAR. Do this by mapping this address into RAR0.
293
hw->mac.ops.rar_set(hw, alt_mac_addr, 0);
300
* igb_rar_set - Set receive address register
301
* @hw: pointer to the HW structure
302
* @addr: pointer to the receive address
303
* @index: receive address array register
305
* Sets the receive address array register at index to the address passed
308
void igb_rar_set(struct e1000_hw *hw, u8 *addr, u32 index)
310
u32 rar_low, rar_high;
313
* HW expects these in little endian so we reverse the byte order
314
* from network order (big endian) to little endian
316
rar_low = ((u32) addr[0] |
317
((u32) addr[1] << 8) |
318
((u32) addr[2] << 16) | ((u32) addr[3] << 24));
320
rar_high = ((u32) addr[4] | ((u32) addr[5] << 8));
322
/* If MAC address zero, no need to set the AV bit */
323
if (rar_low || rar_high)
324
rar_high |= E1000_RAH_AV;
327
* Some bridges will combine consecutive 32-bit writes into
328
* a single burst write, which will malfunction on some parts.
329
* The flushes avoid this.
331
wr32(E1000_RAL(index), rar_low);
333
wr32(E1000_RAH(index), rar_high);
338
* igb_mta_set - Set multicast filter table address
339
* @hw: pointer to the HW structure
340
* @hash_value: determines the MTA register and bit to set
342
* The multicast table address is a register array of 32-bit registers.
343
* The hash_value is used to determine what register the bit is in, the
344
* current value is read, the new bit is OR'd in and the new value is
345
* written back into the register.
347
void igb_mta_set(struct e1000_hw *hw, u32 hash_value)
349
u32 hash_bit, hash_reg, mta;
352
* The MTA is a register array of 32-bit registers. It is
353
* treated like an array of (32*mta_reg_count) bits. We want to
354
* set bit BitArray[hash_value]. So we figure out what register
355
* the bit is in, read it, OR in the new bit, then write
356
* back the new value. The (hw->mac.mta_reg_count - 1) serves as a
357
* mask to bits 31:5 of the hash value which gives us the
358
* register we're modifying. The hash bit within that register
359
* is determined by the lower 5 bits of the hash value.
361
hash_reg = (hash_value >> 5) & (hw->mac.mta_reg_count - 1);
362
hash_bit = hash_value & 0x1F;
364
mta = array_rd32(E1000_MTA, hash_reg);
366
mta |= (1 << hash_bit);
368
array_wr32(E1000_MTA, hash_reg, mta);
373
* igb_hash_mc_addr - Generate a multicast hash value
374
* @hw: pointer to the HW structure
375
* @mc_addr: pointer to a multicast address
377
* Generates a multicast address hash value which is used to determine
378
* the multicast filter table array address and new table value. See
381
static u32 igb_hash_mc_addr(struct e1000_hw *hw, u8 *mc_addr)
383
u32 hash_value, hash_mask;
386
/* Register count multiplied by bits per register */
387
hash_mask = (hw->mac.mta_reg_count * 32) - 1;
390
* For a mc_filter_type of 0, bit_shift is the number of left-shifts
391
* where 0xFF would still fall within the hash mask.
393
while (hash_mask >> bit_shift != 0xFF)
397
* The portion of the address that is used for the hash table
398
* is determined by the mc_filter_type setting.
399
* The algorithm is such that there is a total of 8 bits of shifting.
400
* The bit_shift for a mc_filter_type of 0 represents the number of
401
* left-shifts where the MSB of mc_addr[5] would still fall within
402
* the hash_mask. Case 0 does this exactly. Since there are a total
403
* of 8 bits of shifting, then mc_addr[4] will shift right the
404
* remaining number of bits. Thus 8 - bit_shift. The rest of the
405
* cases are a variation of this algorithm...essentially raising the
406
* number of bits to shift mc_addr[5] left, while still keeping the
407
* 8-bit shifting total.
409
* For example, given the following Destination MAC Address and an
410
* mta register count of 128 (thus a 4096-bit vector and 0xFFF mask),
411
* we can see that the bit_shift for case 0 is 4. These are the hash
412
* values resulting from each mc_filter_type...
413
* [0] [1] [2] [3] [4] [5]
417
* case 0: hash_value = ((0x34 >> 4) | (0x56 << 4)) & 0xFFF = 0x563
418
* case 1: hash_value = ((0x34 >> 3) | (0x56 << 5)) & 0xFFF = 0xAC6
419
* case 2: hash_value = ((0x34 >> 2) | (0x56 << 6)) & 0xFFF = 0x163
420
* case 3: hash_value = ((0x34 >> 0) | (0x56 << 8)) & 0xFFF = 0x634
422
switch (hw->mac.mc_filter_type) {
437
hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) |
438
(((u16) mc_addr[5]) << bit_shift)));
444
* igb_update_mc_addr_list - Update Multicast addresses
445
* @hw: pointer to the HW structure
446
* @mc_addr_list: array of multicast addresses to program
447
* @mc_addr_count: number of multicast addresses to program
449
* Updates entire Multicast Table Array.
450
* The caller must have a packed mc_addr_list of multicast addresses.
452
void igb_update_mc_addr_list(struct e1000_hw *hw,
453
u8 *mc_addr_list, u32 mc_addr_count)
455
u32 hash_value, hash_bit, hash_reg;
458
/* clear mta_shadow */
459
memset(&hw->mac.mta_shadow, 0, sizeof(hw->mac.mta_shadow));
461
/* update mta_shadow from mc_addr_list */
462
for (i = 0; (u32) i < mc_addr_count; i++) {
463
hash_value = igb_hash_mc_addr(hw, mc_addr_list);
465
hash_reg = (hash_value >> 5) & (hw->mac.mta_reg_count - 1);
466
hash_bit = hash_value & 0x1F;
468
hw->mac.mta_shadow[hash_reg] |= (1 << hash_bit);
469
mc_addr_list += (ETH_ALEN);
472
/* replace the entire MTA table */
473
for (i = hw->mac.mta_reg_count - 1; i >= 0; i--)
474
array_wr32(E1000_MTA, i, hw->mac.mta_shadow[i]);
479
* igb_clear_hw_cntrs_base - Clear base hardware counters
480
* @hw: pointer to the HW structure
482
* Clears the base hardware counters by reading the counter registers.
484
void igb_clear_hw_cntrs_base(struct e1000_hw *hw)
526
* igb_check_for_copper_link - Check for link (Copper)
527
* @hw: pointer to the HW structure
529
* Checks to see of the link status of the hardware has changed. If a
530
* change in link status has been detected, then we read the PHY registers
531
* to get the current speed/duplex if link exists.
533
s32 igb_check_for_copper_link(struct e1000_hw *hw)
535
struct e1000_mac_info *mac = &hw->mac;
540
* We only want to go out to the PHY registers to see if Auto-Neg
541
* has completed and/or if our link status has changed. The
542
* get_link_status flag is set upon receiving a Link Status
543
* Change or Rx Sequence Error interrupt.
545
if (!mac->get_link_status) {
551
* First we want to see if the MII Status Register reports
552
* link. If so, then we want to get the current speed/duplex
555
ret_val = igb_phy_has_link(hw, 1, 0, &link);
560
goto out; /* No link detected */
562
mac->get_link_status = false;
565
* Check if there was DownShift, must be checked
566
* immediately after link-up
568
igb_check_downshift(hw);
571
* If we are forcing speed/duplex, then we simply return since
572
* we have already determined whether we have link or not.
575
ret_val = -E1000_ERR_CONFIG;
580
* Auto-Neg is enabled. Auto Speed Detection takes care
581
* of MAC speed/duplex configuration. So we only need to
582
* configure Collision Distance in the MAC.
584
igb_config_collision_dist(hw);
587
* Configure Flow Control now that Auto-Neg has completed.
588
* First, we need to restore the desired flow control
589
* settings because we may have had to re-autoneg with a
590
* different link partner.
592
ret_val = igb_config_fc_after_link_up(hw);
594
hw_dbg("Error configuring flow control\n");
601
* igb_setup_link - Setup flow control and link settings
602
* @hw: pointer to the HW structure
604
* Determines which flow control settings to use, then configures flow
605
* control. Calls the appropriate media-specific link configuration
606
* function. Assuming the adapter has a valid link partner, a valid link
607
* should be established. Assumes the hardware has previously been reset
608
* and the transmitter and receiver are not enabled.
610
s32 igb_setup_link(struct e1000_hw *hw)
615
* In the case of the phy reset being blocked, we already have a link.
616
* We do not need to set it up again.
618
if (igb_check_reset_block(hw))
622
* If requested flow control is set to default, set flow control
623
* based on the EEPROM flow control settings.
625
if (hw->fc.requested_mode == e1000_fc_default) {
626
ret_val = igb_set_default_fc(hw);
632
* We want to save off the original Flow Control configuration just
633
* in case we get disconnected and then reconnected into a different
634
* hub or switch with different Flow Control capabilities.
636
hw->fc.current_mode = hw->fc.requested_mode;
638
hw_dbg("After fix-ups FlowControl is now = %x\n", hw->fc.current_mode);
640
/* Call the necessary media_type subroutine to configure the link. */
641
ret_val = hw->mac.ops.setup_physical_interface(hw);
646
* Initialize the flow control address, type, and PAUSE timer
647
* registers to their default values. This is done even if flow
648
* control is disabled, because it does not hurt anything to
649
* initialize these registers.
651
hw_dbg("Initializing the Flow Control address, type and timer regs\n");
652
wr32(E1000_FCT, FLOW_CONTROL_TYPE);
653
wr32(E1000_FCAH, FLOW_CONTROL_ADDRESS_HIGH);
654
wr32(E1000_FCAL, FLOW_CONTROL_ADDRESS_LOW);
656
wr32(E1000_FCTTV, hw->fc.pause_time);
658
ret_val = igb_set_fc_watermarks(hw);
665
* igb_config_collision_dist - Configure collision distance
666
* @hw: pointer to the HW structure
668
* Configures the collision distance to the default value and is used
669
* during link setup. Currently no func pointer exists and all
670
* implementations are handled in the generic version of this function.
672
void igb_config_collision_dist(struct e1000_hw *hw)
676
tctl = rd32(E1000_TCTL);
678
tctl &= ~E1000_TCTL_COLD;
679
tctl |= E1000_COLLISION_DISTANCE << E1000_COLD_SHIFT;
681
wr32(E1000_TCTL, tctl);
686
* igb_set_fc_watermarks - Set flow control high/low watermarks
687
* @hw: pointer to the HW structure
689
* Sets the flow control high/low threshold (watermark) registers. If
690
* flow control XON frame transmission is enabled, then set XON frame
691
* tansmission as well.
693
static s32 igb_set_fc_watermarks(struct e1000_hw *hw)
696
u32 fcrtl = 0, fcrth = 0;
699
* Set the flow control receive threshold registers. Normally,
700
* these registers will be set to a default threshold that may be
701
* adjusted later by the driver's runtime code. However, if the
702
* ability to transmit pause frames is not enabled, then these
703
* registers will be set to 0.
705
if (hw->fc.current_mode & e1000_fc_tx_pause) {
707
* We need to set up the Receive Threshold high and low water
708
* marks as well as (optionally) enabling the transmission of
711
fcrtl = hw->fc.low_water;
713
fcrtl |= E1000_FCRTL_XONE;
715
fcrth = hw->fc.high_water;
717
wr32(E1000_FCRTL, fcrtl);
718
wr32(E1000_FCRTH, fcrth);
724
* igb_set_default_fc - Set flow control default values
725
* @hw: pointer to the HW structure
727
* Read the EEPROM for the default values for flow control and store the
730
static s32 igb_set_default_fc(struct e1000_hw *hw)
736
* Read and store word 0x0F of the EEPROM. This word contains bits
737
* that determine the hardware's default PAUSE (flow control) mode,
738
* a bit that determines whether the HW defaults to enabling or
739
* disabling auto-negotiation, and the direction of the
740
* SW defined pins. If there is no SW over-ride of the flow
741
* control setting, then the variable hw->fc will
742
* be initialized based on a value in the EEPROM.
744
ret_val = hw->nvm.ops.read(hw, NVM_INIT_CONTROL2_REG, 1, &nvm_data);
747
hw_dbg("NVM Read Error\n");
751
if ((nvm_data & NVM_WORD0F_PAUSE_MASK) == 0)
752
hw->fc.requested_mode = e1000_fc_none;
753
else if ((nvm_data & NVM_WORD0F_PAUSE_MASK) ==
755
hw->fc.requested_mode = e1000_fc_tx_pause;
757
hw->fc.requested_mode = e1000_fc_full;
764
* igb_force_mac_fc - Force the MAC's flow control settings
765
* @hw: pointer to the HW structure
767
* Force the MAC's flow control settings. Sets the TFCE and RFCE bits in the
768
* device control register to reflect the adapter settings. TFCE and RFCE
769
* need to be explicitly set by software when a copper PHY is used because
770
* autonegotiation is managed by the PHY rather than the MAC. Software must
771
* also configure these bits when link is forced on a fiber connection.
773
s32 igb_force_mac_fc(struct e1000_hw *hw)
778
ctrl = rd32(E1000_CTRL);
781
* Because we didn't get link via the internal auto-negotiation
782
* mechanism (we either forced link or we got link via PHY
783
* auto-neg), we have to manually enable/disable transmit an
784
* receive flow control.
786
* The "Case" statement below enables/disable flow control
787
* according to the "hw->fc.current_mode" parameter.
789
* The possible values of the "fc" parameter are:
790
* 0: Flow control is completely disabled
791
* 1: Rx flow control is enabled (we can receive pause
792
* frames but not send pause frames).
793
* 2: Tx flow control is enabled (we can send pause frames
794
* frames but we do not receive pause frames).
795
* 3: Both Rx and TX flow control (symmetric) is enabled.
796
* other: No other values should be possible at this point.
798
hw_dbg("hw->fc.current_mode = %u\n", hw->fc.current_mode);
800
switch (hw->fc.current_mode) {
802
ctrl &= (~(E1000_CTRL_TFCE | E1000_CTRL_RFCE));
804
case e1000_fc_rx_pause:
805
ctrl &= (~E1000_CTRL_TFCE);
806
ctrl |= E1000_CTRL_RFCE;
808
case e1000_fc_tx_pause:
809
ctrl &= (~E1000_CTRL_RFCE);
810
ctrl |= E1000_CTRL_TFCE;
813
ctrl |= (E1000_CTRL_TFCE | E1000_CTRL_RFCE);
816
hw_dbg("Flow control param set incorrectly\n");
817
ret_val = -E1000_ERR_CONFIG;
821
wr32(E1000_CTRL, ctrl);
828
* igb_config_fc_after_link_up - Configures flow control after link
829
* @hw: pointer to the HW structure
831
* Checks the status of auto-negotiation after link up to ensure that the
832
* speed and duplex were not forced. If the link needed to be forced, then
833
* flow control needs to be forced also. If auto-negotiation is enabled
834
* and did not fail, then we configure flow control based on our link
837
s32 igb_config_fc_after_link_up(struct e1000_hw *hw)
839
struct e1000_mac_info *mac = &hw->mac;
841
u16 mii_status_reg, mii_nway_adv_reg, mii_nway_lp_ability_reg;
845
* Check for the case where we have fiber media and auto-neg failed
846
* so we had to force link. In this case, we need to force the
847
* configuration of the MAC to match the "fc" parameter.
849
if (mac->autoneg_failed) {
850
if (hw->phy.media_type == e1000_media_type_internal_serdes)
851
ret_val = igb_force_mac_fc(hw);
853
if (hw->phy.media_type == e1000_media_type_copper)
854
ret_val = igb_force_mac_fc(hw);
858
hw_dbg("Error forcing flow control settings\n");
863
* Check for the case where we have copper media and auto-neg is
864
* enabled. In this case, we need to check and see if Auto-Neg
865
* has completed, and if so, how the PHY and link partner has
866
* flow control configured.
868
if ((hw->phy.media_type == e1000_media_type_copper) && mac->autoneg) {
870
* Read the MII Status Register and check to see if AutoNeg
871
* has completed. We read this twice because this reg has
872
* some "sticky" (latched) bits.
874
ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS,
878
ret_val = hw->phy.ops.read_reg(hw, PHY_STATUS,
883
if (!(mii_status_reg & MII_SR_AUTONEG_COMPLETE)) {
884
hw_dbg("Copper PHY and Auto Neg "
885
"has not completed.\n");
890
* The AutoNeg process has completed, so we now need to
891
* read both the Auto Negotiation Advertisement
892
* Register (Address 4) and the Auto_Negotiation Base
893
* Page Ability Register (Address 5) to determine how
894
* flow control was negotiated.
896
ret_val = hw->phy.ops.read_reg(hw, PHY_AUTONEG_ADV,
900
ret_val = hw->phy.ops.read_reg(hw, PHY_LP_ABILITY,
901
&mii_nway_lp_ability_reg);
906
* Two bits in the Auto Negotiation Advertisement Register
907
* (Address 4) and two bits in the Auto Negotiation Base
908
* Page Ability Register (Address 5) determine flow control
909
* for both the PHY and the link partner. The following
910
* table, taken out of the IEEE 802.3ab/D6.0 dated March 25,
911
* 1999, describes these PAUSE resolution bits and how flow
912
* control is determined based upon these settings.
913
* NOTE: DC = Don't Care
915
* LOCAL DEVICE | LINK PARTNER
916
* PAUSE | ASM_DIR | PAUSE | ASM_DIR | NIC Resolution
917
*-------|---------|-------|---------|--------------------
918
* 0 | 0 | DC | DC | e1000_fc_none
919
* 0 | 1 | 0 | DC | e1000_fc_none
920
* 0 | 1 | 1 | 0 | e1000_fc_none
921
* 0 | 1 | 1 | 1 | e1000_fc_tx_pause
922
* 1 | 0 | 0 | DC | e1000_fc_none
923
* 1 | DC | 1 | DC | e1000_fc_full
924
* 1 | 1 | 0 | 0 | e1000_fc_none
925
* 1 | 1 | 0 | 1 | e1000_fc_rx_pause
927
* Are both PAUSE bits set to 1? If so, this implies
928
* Symmetric Flow Control is enabled at both ends. The
929
* ASM_DIR bits are irrelevant per the spec.
931
* For Symmetric Flow Control:
933
* LOCAL DEVICE | LINK PARTNER
934
* PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result
935
*-------|---------|-------|---------|--------------------
936
* 1 | DC | 1 | DC | E1000_fc_full
939
if ((mii_nway_adv_reg & NWAY_AR_PAUSE) &&
940
(mii_nway_lp_ability_reg & NWAY_LPAR_PAUSE)) {
942
* Now we need to check if the user selected RX ONLY
943
* of pause frames. In this case, we had to advertise
944
* FULL flow control because we could not advertise RX
945
* ONLY. Hence, we must now check to see if we need to
946
* turn OFF the TRANSMISSION of PAUSE frames.
948
if (hw->fc.requested_mode == e1000_fc_full) {
949
hw->fc.current_mode = e1000_fc_full;
950
hw_dbg("Flow Control = FULL.\r\n");
952
hw->fc.current_mode = e1000_fc_rx_pause;
953
hw_dbg("Flow Control = "
954
"RX PAUSE frames only.\r\n");
958
* For receiving PAUSE frames ONLY.
960
* LOCAL DEVICE | LINK PARTNER
961
* PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result
962
*-------|---------|-------|---------|--------------------
963
* 0 | 1 | 1 | 1 | e1000_fc_tx_pause
965
else if (!(mii_nway_adv_reg & NWAY_AR_PAUSE) &&
966
(mii_nway_adv_reg & NWAY_AR_ASM_DIR) &&
967
(mii_nway_lp_ability_reg & NWAY_LPAR_PAUSE) &&
968
(mii_nway_lp_ability_reg & NWAY_LPAR_ASM_DIR)) {
969
hw->fc.current_mode = e1000_fc_tx_pause;
970
hw_dbg("Flow Control = TX PAUSE frames only.\r\n");
973
* For transmitting PAUSE frames ONLY.
975
* LOCAL DEVICE | LINK PARTNER
976
* PAUSE | ASM_DIR | PAUSE | ASM_DIR | Result
977
*-------|---------|-------|---------|--------------------
978
* 1 | 1 | 0 | 1 | e1000_fc_rx_pause
980
else if ((mii_nway_adv_reg & NWAY_AR_PAUSE) &&
981
(mii_nway_adv_reg & NWAY_AR_ASM_DIR) &&
982
!(mii_nway_lp_ability_reg & NWAY_LPAR_PAUSE) &&
983
(mii_nway_lp_ability_reg & NWAY_LPAR_ASM_DIR)) {
984
hw->fc.current_mode = e1000_fc_rx_pause;
985
hw_dbg("Flow Control = RX PAUSE frames only.\r\n");
988
* Per the IEEE spec, at this point flow control should be
989
* disabled. However, we want to consider that we could
990
* be connected to a legacy switch that doesn't advertise
991
* desired flow control, but can be forced on the link
992
* partner. So if we advertised no flow control, that is
993
* what we will resolve to. If we advertised some kind of
994
* receive capability (Rx Pause Only or Full Flow Control)
995
* and the link partner advertised none, we will configure
996
* ourselves to enable Rx Flow Control only. We can do
997
* this safely for two reasons: If the link partner really
998
* didn't want flow control enabled, and we enable Rx, no
999
* harm done since we won't be receiving any PAUSE frames
1000
* anyway. If the intent on the link partner was to have
1001
* flow control enabled, then by us enabling RX only, we
1002
* can at least receive pause frames and process them.
1003
* This is a good idea because in most cases, since we are
1004
* predominantly a server NIC, more times than not we will
1005
* be asked to delay transmission of packets than asking
1006
* our link partner to pause transmission of frames.
1008
else if ((hw->fc.requested_mode == e1000_fc_none ||
1009
hw->fc.requested_mode == e1000_fc_tx_pause) ||
1010
hw->fc.strict_ieee) {
1011
hw->fc.current_mode = e1000_fc_none;
1012
hw_dbg("Flow Control = NONE.\r\n");
1014
hw->fc.current_mode = e1000_fc_rx_pause;
1015
hw_dbg("Flow Control = RX PAUSE frames only.\r\n");
1019
* Now we need to do one last check... If we auto-
1020
* negotiated to HALF DUPLEX, flow control should not be
1021
* enabled per IEEE 802.3 spec.
1023
ret_val = hw->mac.ops.get_speed_and_duplex(hw, &speed, &duplex);
1025
hw_dbg("Error getting link speed and duplex\n");
1029
if (duplex == HALF_DUPLEX)
1030
hw->fc.current_mode = e1000_fc_none;
1033
* Now we call a subroutine to actually force the MAC
1034
* controller to use the correct flow control settings.
1036
ret_val = igb_force_mac_fc(hw);
1038
hw_dbg("Error forcing flow control settings\n");
1048
* igb_get_speed_and_duplex_copper - Retrieve current speed/duplex
1049
* @hw: pointer to the HW structure
1050
* @speed: stores the current speed
1051
* @duplex: stores the current duplex
1053
* Read the status register for the current speed/duplex and store the current
1054
* speed and duplex for copper connections.
1056
s32 igb_get_speed_and_duplex_copper(struct e1000_hw *hw, u16 *speed,
1061
status = rd32(E1000_STATUS);
1062
if (status & E1000_STATUS_SPEED_1000) {
1063
*speed = SPEED_1000;
1064
hw_dbg("1000 Mbs, ");
1065
} else if (status & E1000_STATUS_SPEED_100) {
1067
hw_dbg("100 Mbs, ");
1073
if (status & E1000_STATUS_FD) {
1074
*duplex = FULL_DUPLEX;
1075
hw_dbg("Full Duplex\n");
1077
*duplex = HALF_DUPLEX;
1078
hw_dbg("Half Duplex\n");
1085
* igb_get_hw_semaphore - Acquire hardware semaphore
1086
* @hw: pointer to the HW structure
1088
* Acquire the HW semaphore to access the PHY or NVM
1090
s32 igb_get_hw_semaphore(struct e1000_hw *hw)
1094
s32 timeout = hw->nvm.word_size + 1;
1097
/* Get the SW semaphore */
1098
while (i < timeout) {
1099
swsm = rd32(E1000_SWSM);
1100
if (!(swsm & E1000_SWSM_SMBI))
1108
hw_dbg("Driver can't access device - SMBI bit is set.\n");
1109
ret_val = -E1000_ERR_NVM;
1113
/* Get the FW semaphore. */
1114
for (i = 0; i < timeout; i++) {
1115
swsm = rd32(E1000_SWSM);
1116
wr32(E1000_SWSM, swsm | E1000_SWSM_SWESMBI);
1118
/* Semaphore acquired if bit latched */
1119
if (rd32(E1000_SWSM) & E1000_SWSM_SWESMBI)
1126
/* Release semaphores */
1127
igb_put_hw_semaphore(hw);
1128
hw_dbg("Driver can't access the NVM\n");
1129
ret_val = -E1000_ERR_NVM;
1138
* igb_put_hw_semaphore - Release hardware semaphore
1139
* @hw: pointer to the HW structure
1141
* Release hardware semaphore used to access the PHY or NVM
1143
void igb_put_hw_semaphore(struct e1000_hw *hw)
1147
swsm = rd32(E1000_SWSM);
1149
swsm &= ~(E1000_SWSM_SMBI | E1000_SWSM_SWESMBI);
1151
wr32(E1000_SWSM, swsm);
1155
* igb_get_auto_rd_done - Check for auto read completion
1156
* @hw: pointer to the HW structure
1158
* Check EEPROM for Auto Read done bit.
1160
s32 igb_get_auto_rd_done(struct e1000_hw *hw)
1166
while (i < AUTO_READ_DONE_TIMEOUT) {
1167
if (rd32(E1000_EECD) & E1000_EECD_AUTO_RD)
1173
if (i == AUTO_READ_DONE_TIMEOUT) {
1174
hw_dbg("Auto read by HW from NVM has not completed.\n");
1175
ret_val = -E1000_ERR_RESET;
1184
* igb_valid_led_default - Verify a valid default LED config
1185
* @hw: pointer to the HW structure
1186
* @data: pointer to the NVM (EEPROM)
1188
* Read the EEPROM for the current default LED configuration. If the
1189
* LED configuration is not valid, set to a valid LED configuration.
1191
static s32 igb_valid_led_default(struct e1000_hw *hw, u16 *data)
1195
ret_val = hw->nvm.ops.read(hw, NVM_ID_LED_SETTINGS, 1, data);
1197
hw_dbg("NVM Read Error\n");
1201
if (*data == ID_LED_RESERVED_0000 || *data == ID_LED_RESERVED_FFFF) {
1202
switch(hw->phy.media_type) {
1203
case e1000_media_type_internal_serdes:
1204
*data = ID_LED_DEFAULT_82575_SERDES;
1206
case e1000_media_type_copper:
1208
*data = ID_LED_DEFAULT;
1218
* @hw: pointer to the HW structure
1221
s32 igb_id_led_init(struct e1000_hw *hw)
1223
struct e1000_mac_info *mac = &hw->mac;
1225
const u32 ledctl_mask = 0x000000FF;
1226
const u32 ledctl_on = E1000_LEDCTL_MODE_LED_ON;
1227
const u32 ledctl_off = E1000_LEDCTL_MODE_LED_OFF;
1229
const u16 led_mask = 0x0F;
1231
ret_val = igb_valid_led_default(hw, &data);
1235
mac->ledctl_default = rd32(E1000_LEDCTL);
1236
mac->ledctl_mode1 = mac->ledctl_default;
1237
mac->ledctl_mode2 = mac->ledctl_default;
1239
for (i = 0; i < 4; i++) {
1240
temp = (data >> (i << 2)) & led_mask;
1242
case ID_LED_ON1_DEF2:
1243
case ID_LED_ON1_ON2:
1244
case ID_LED_ON1_OFF2:
1245
mac->ledctl_mode1 &= ~(ledctl_mask << (i << 3));
1246
mac->ledctl_mode1 |= ledctl_on << (i << 3);
1248
case ID_LED_OFF1_DEF2:
1249
case ID_LED_OFF1_ON2:
1250
case ID_LED_OFF1_OFF2:
1251
mac->ledctl_mode1 &= ~(ledctl_mask << (i << 3));
1252
mac->ledctl_mode1 |= ledctl_off << (i << 3);
1259
case ID_LED_DEF1_ON2:
1260
case ID_LED_ON1_ON2:
1261
case ID_LED_OFF1_ON2:
1262
mac->ledctl_mode2 &= ~(ledctl_mask << (i << 3));
1263
mac->ledctl_mode2 |= ledctl_on << (i << 3);
1265
case ID_LED_DEF1_OFF2:
1266
case ID_LED_ON1_OFF2:
1267
case ID_LED_OFF1_OFF2:
1268
mac->ledctl_mode2 &= ~(ledctl_mask << (i << 3));
1269
mac->ledctl_mode2 |= ledctl_off << (i << 3);
1282
* igb_cleanup_led - Set LED config to default operation
1283
* @hw: pointer to the HW structure
1285
* Remove the current LED configuration and set the LED configuration
1286
* to the default value, saved from the EEPROM.
1288
s32 igb_cleanup_led(struct e1000_hw *hw)
1290
wr32(E1000_LEDCTL, hw->mac.ledctl_default);
1295
* igb_blink_led - Blink LED
1296
* @hw: pointer to the HW structure
1298
* Blink the led's which are set to be on.
1300
s32 igb_blink_led(struct e1000_hw *hw)
1302
u32 ledctl_blink = 0;
1306
* set the blink bit for each LED that's "on" (0x0E)
1309
ledctl_blink = hw->mac.ledctl_mode2;
1310
for (i = 0; i < 4; i++)
1311
if (((hw->mac.ledctl_mode2 >> (i * 8)) & 0xFF) ==
1312
E1000_LEDCTL_MODE_LED_ON)
1313
ledctl_blink |= (E1000_LEDCTL_LED0_BLINK <<
1316
wr32(E1000_LEDCTL, ledctl_blink);
1322
* igb_led_off - Turn LED off
1323
* @hw: pointer to the HW structure
1327
s32 igb_led_off(struct e1000_hw *hw)
1329
switch (hw->phy.media_type) {
1330
case e1000_media_type_copper:
1331
wr32(E1000_LEDCTL, hw->mac.ledctl_mode1);
1341
* igb_disable_pcie_master - Disables PCI-express master access
1342
* @hw: pointer to the HW structure
1344
* Returns 0 (0) if successful, else returns -10
1345
* (-E1000_ERR_MASTER_REQUESTS_PENDING) if master disable bit has not casued
1346
* the master requests to be disabled.
1348
* Disables PCI-Express master access and verifies there are no pending
1351
s32 igb_disable_pcie_master(struct e1000_hw *hw)
1354
s32 timeout = MASTER_DISABLE_TIMEOUT;
1357
if (hw->bus.type != e1000_bus_type_pci_express)
1360
ctrl = rd32(E1000_CTRL);
1361
ctrl |= E1000_CTRL_GIO_MASTER_DISABLE;
1362
wr32(E1000_CTRL, ctrl);
1365
if (!(rd32(E1000_STATUS) &
1366
E1000_STATUS_GIO_MASTER_ENABLE))
1373
hw_dbg("Master requests are pending.\n");
1374
ret_val = -E1000_ERR_MASTER_REQUESTS_PENDING;
1383
* igb_validate_mdi_setting - Verify MDI/MDIx settings
1384
* @hw: pointer to the HW structure
1386
* Verify that when not using auto-negotitation that MDI/MDIx is correctly
1387
* set, which is forced to MDI mode only.
1389
s32 igb_validate_mdi_setting(struct e1000_hw *hw)
1393
if (!hw->mac.autoneg && (hw->phy.mdix == 0 || hw->phy.mdix == 3)) {
1394
hw_dbg("Invalid MDI setting detected\n");
1396
ret_val = -E1000_ERR_CONFIG;
1405
* igb_write_8bit_ctrl_reg - Write a 8bit CTRL register
1406
* @hw: pointer to the HW structure
1407
* @reg: 32bit register offset such as E1000_SCTL
1408
* @offset: register offset to write to
1409
* @data: data to write at register offset
1411
* Writes an address/data control type register. There are several of these
1412
* and they all have the format address << 8 | data and bit 31 is polled for
1415
s32 igb_write_8bit_ctrl_reg(struct e1000_hw *hw, u32 reg,
1416
u32 offset, u8 data)
1418
u32 i, regvalue = 0;
1421
/* Set up the address and data */
1422
regvalue = ((u32)data) | (offset << E1000_GEN_CTL_ADDRESS_SHIFT);
1423
wr32(reg, regvalue);
1425
/* Poll the ready bit to see if the MDI read completed */
1426
for (i = 0; i < E1000_GEN_POLL_TIMEOUT; i++) {
1428
regvalue = rd32(reg);
1429
if (regvalue & E1000_GEN_CTL_READY)
1432
if (!(regvalue & E1000_GEN_CTL_READY)) {
1433
hw_dbg("Reg %08x did not indicate ready\n", reg);
1434
ret_val = -E1000_ERR_PHY;
1443
* igb_enable_mng_pass_thru - Enable processing of ARP's
1444
* @hw: pointer to the HW structure
1446
* Verifies the hardware needs to leave interface enabled so that frames can
1447
* be directed to and from the management interface.
1449
bool igb_enable_mng_pass_thru(struct e1000_hw *hw)
1453
bool ret_val = false;
1455
if (!hw->mac.asf_firmware_present)
1458
manc = rd32(E1000_MANC);
1460
if (!(manc & E1000_MANC_RCV_TCO_EN))
1463
if (hw->mac.arc_subsystem_valid) {
1464
fwsm = rd32(E1000_FWSM);
1465
factps = rd32(E1000_FACTPS);
1467
if (!(factps & E1000_FACTPS_MNGCG) &&
1468
((fwsm & E1000_FWSM_MODE_MASK) ==
1469
(e1000_mng_mode_pt << E1000_FWSM_MODE_SHIFT))) {
1474
if ((manc & E1000_MANC_SMBUS_EN) &&
1475
!(manc & E1000_MANC_ASF_EN)) {