1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2015 - 2022 Beijing WangXun Technology Co., Ltd. */
3
4 #include <linux/etherdevice.h>
5 #include <linux/if_ether.h>
6 #include <linux/string.h>
7 #include <linux/iopoll.h>
8 #include <linux/types.h>
9 #include <linux/pci.h>
10
11 #include "../libwx/wx_type.h"
12 #include "../libwx/wx_hw.h"
13 #include "txgbe_type.h"
14 #include "txgbe_hw.h"
15
16 /**
17 * txgbe_disable_sec_tx_path - Stops the transmit data path
18 * @wx: pointer to hardware structure
19 *
20 * Stops the transmit data path and waits for the HW to internally empty
21 * the tx security block
22 **/
txgbe_disable_sec_tx_path(struct wx * wx)23 int txgbe_disable_sec_tx_path(struct wx *wx)
24 {
25 int val;
26
27 wr32m(wx, WX_TSC_CTL, WX_TSC_CTL_TX_DIS, WX_TSC_CTL_TX_DIS);
28 return read_poll_timeout(rd32, val, val & WX_TSC_ST_SECTX_RDY,
29 1000, 20000, false, wx, WX_TSC_ST);
30 }
31
32 /**
33 * txgbe_enable_sec_tx_path - Enables the transmit data path
34 * @wx: pointer to hardware structure
35 *
36 * Enables the transmit data path.
37 **/
txgbe_enable_sec_tx_path(struct wx * wx)38 void txgbe_enable_sec_tx_path(struct wx *wx)
39 {
40 wr32m(wx, WX_TSC_CTL, WX_TSC_CTL_TX_DIS, 0);
41 WX_WRITE_FLUSH(wx);
42 }
43
44 /**
45 * txgbe_init_thermal_sensor_thresh - Inits thermal sensor thresholds
46 * @wx: pointer to hardware structure
47 *
48 * Inits the thermal sensor thresholds according to the NVM map
49 * and save off the threshold and location values into mac.thermal_sensor_data
50 **/
txgbe_init_thermal_sensor_thresh(struct wx * wx)51 static void txgbe_init_thermal_sensor_thresh(struct wx *wx)
52 {
53 struct wx_thermal_sensor_data *data = &wx->mac.sensor;
54
55 memset(data, 0, sizeof(struct wx_thermal_sensor_data));
56
57 /* Only support thermal sensors attached to SP physical port 0 */
58 if (wx->bus.func)
59 return;
60
61 wr32(wx, TXGBE_TS_CTL, TXGBE_TS_CTL_EVAL_MD);
62
63 wr32(wx, WX_TS_INT_EN,
64 WX_TS_INT_EN_ALARM_INT_EN | WX_TS_INT_EN_DALARM_INT_EN);
65 wr32(wx, WX_TS_EN, WX_TS_EN_ENA);
66
67 data->alarm_thresh = 100;
68 wr32(wx, WX_TS_ALARM_THRE, 677);
69 data->dalarm_thresh = 90;
70 wr32(wx, WX_TS_DALARM_THRE, 614);
71 }
72
73 /**
74 * txgbe_calc_eeprom_checksum - Calculates and returns the checksum
75 * @wx: pointer to hardware structure
76 * @checksum: pointer to cheksum
77 *
78 * Returns a negative error code on error
79 **/
txgbe_calc_eeprom_checksum(struct wx * wx,u16 * checksum)80 static int txgbe_calc_eeprom_checksum(struct wx *wx, u16 *checksum)
81 {
82 u16 *eeprom_ptrs = NULL;
83 u16 *local_buffer;
84 int status;
85 u16 i;
86
87 wx_init_eeprom_params(wx);
88
89 eeprom_ptrs = kvmalloc_array(TXGBE_EEPROM_LAST_WORD, sizeof(u16),
90 GFP_KERNEL);
91 if (!eeprom_ptrs)
92 return -ENOMEM;
93 /* Read pointer area */
94 status = wx_read_ee_hostif_buffer(wx, 0, TXGBE_EEPROM_LAST_WORD, eeprom_ptrs);
95 if (status != 0) {
96 wx_err(wx, "Failed to read EEPROM image\n");
97 kvfree(eeprom_ptrs);
98 return status;
99 }
100 local_buffer = eeprom_ptrs;
101
102 for (i = 0; i < TXGBE_EEPROM_LAST_WORD; i++)
103 if (i != wx->eeprom.sw_region_offset + TXGBE_EEPROM_CHECKSUM)
104 *checksum += local_buffer[i];
105
106 kvfree(eeprom_ptrs);
107
108 *checksum = TXGBE_EEPROM_SUM - *checksum;
109
110 return 0;
111 }
112
113 /**
114 * txgbe_validate_eeprom_checksum - Validate EEPROM checksum
115 * @wx: pointer to hardware structure
116 * @checksum_val: calculated checksum
117 *
118 * Performs checksum calculation and validates the EEPROM checksum. If the
119 * caller does not need checksum_val, the value can be NULL.
120 **/
txgbe_validate_eeprom_checksum(struct wx * wx,u16 * checksum_val)121 int txgbe_validate_eeprom_checksum(struct wx *wx, u16 *checksum_val)
122 {
123 u16 read_checksum = 0;
124 u16 checksum;
125 int status;
126
127 /* Read the first word from the EEPROM. If this times out or fails, do
128 * not continue or we could be in for a very long wait while every
129 * EEPROM read fails
130 */
131 status = wx_read_ee_hostif(wx, 0, &checksum);
132 if (status) {
133 wx_err(wx, "EEPROM read failed\n");
134 return status;
135 }
136
137 checksum = 0;
138 status = txgbe_calc_eeprom_checksum(wx, &checksum);
139 if (status != 0)
140 return status;
141
142 status = wx_read_ee_hostif(wx, wx->eeprom.sw_region_offset +
143 TXGBE_EEPROM_CHECKSUM, &read_checksum);
144 if (status != 0)
145 return status;
146
147 /* Verify read checksum from EEPROM is the same as
148 * calculated checksum
149 */
150 if (read_checksum != checksum) {
151 status = -EIO;
152 wx_err(wx, "Invalid EEPROM checksum\n");
153 }
154
155 /* If the user cares, return the calculated checksum */
156 if (checksum_val)
157 *checksum_val = checksum;
158
159 return status;
160 }
161
txgbe_reset_misc(struct wx * wx)162 static void txgbe_reset_misc(struct wx *wx)
163 {
164 wx_reset_misc(wx);
165 txgbe_init_thermal_sensor_thresh(wx);
166 }
167
168 /**
169 * txgbe_reset_hw - Perform hardware reset
170 * @wx: pointer to wx structure
171 *
172 * Resets the hardware by resetting the transmit and receive units, masks
173 * and clears all interrupts, perform a PHY reset, and perform a link (MAC)
174 * reset.
175 **/
txgbe_reset_hw(struct wx * wx)176 int txgbe_reset_hw(struct wx *wx)
177 {
178 int status;
179
180 /* Call adapter stop to disable tx/rx and clear interrupts */
181 status = wx_stop_adapter(wx);
182 if (status != 0)
183 return status;
184
185 if (wx->media_type != sp_media_copper) {
186 u32 val;
187
188 val = WX_MIS_RST_LAN_RST(wx->bus.func);
189 wr32(wx, WX_MIS_RST, val | rd32(wx, WX_MIS_RST));
190 WX_WRITE_FLUSH(wx);
191 usleep_range(10, 100);
192 }
193
194 status = wx_check_flash_load(wx, TXGBE_SPI_ILDR_STATUS_LAN_SW_RST(wx->bus.func));
195 if (status != 0)
196 return status;
197
198 txgbe_reset_misc(wx);
199
200 wx_clear_hw_cntrs(wx);
201
202 /* Store the permanent mac address */
203 wx_get_mac_addr(wx, wx->mac.perm_addr);
204
205 /* Store MAC address from RAR0, clear receive address registers, and
206 * clear the multicast table. Also reset num_rar_entries to 128,
207 * since we modify this value when programming the SAN MAC address.
208 */
209 wx->mac.num_rar_entries = TXGBE_SP_RAR_ENTRIES;
210 wx_init_rx_addrs(wx);
211
212 pci_set_master(wx->pdev);
213
214 return 0;
215 }
216