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  **/
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  **/
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  **/
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_read_pba_string - Reads part number string from EEPROM
75  *  @wx: pointer to hardware structure
76  *  @pba_num: stores the part number string from the EEPROM
77  *  @pba_num_size: part number string buffer length
78  *
79  *  Reads the part number string from the EEPROM.
80  **/
81 int txgbe_read_pba_string(struct wx *wx, u8 *pba_num, u32 pba_num_size)
82 {
83 	u16 pba_ptr, offset, length, data;
84 	int ret_val;
85 
86 	if (!pba_num) {
87 		wx_err(wx, "PBA string buffer was null\n");
88 		return -EINVAL;
89 	}
90 
91 	ret_val = wx_read_ee_hostif(wx,
92 				    wx->eeprom.sw_region_offset + TXGBE_PBANUM0_PTR,
93 				    &data);
94 	if (ret_val != 0) {
95 		wx_err(wx, "NVM Read Error\n");
96 		return ret_val;
97 	}
98 
99 	ret_val = wx_read_ee_hostif(wx,
100 				    wx->eeprom.sw_region_offset + TXGBE_PBANUM1_PTR,
101 				    &pba_ptr);
102 	if (ret_val != 0) {
103 		wx_err(wx, "NVM Read Error\n");
104 		return ret_val;
105 	}
106 
107 	/* if data is not ptr guard the PBA must be in legacy format which
108 	 * means pba_ptr is actually our second data word for the PBA number
109 	 * and we can decode it into an ascii string
110 	 */
111 	if (data != TXGBE_PBANUM_PTR_GUARD) {
112 		wx_err(wx, "NVM PBA number is not stored as string\n");
113 
114 		/* we will need 11 characters to store the PBA */
115 		if (pba_num_size < 11) {
116 			wx_err(wx, "PBA string buffer too small\n");
117 			return -ENOMEM;
118 		}
119 
120 		/* extract hex string from data and pba_ptr */
121 		pba_num[0] = (data >> 12) & 0xF;
122 		pba_num[1] = (data >> 8) & 0xF;
123 		pba_num[2] = (data >> 4) & 0xF;
124 		pba_num[3] = data & 0xF;
125 		pba_num[4] = (pba_ptr >> 12) & 0xF;
126 		pba_num[5] = (pba_ptr >> 8) & 0xF;
127 		pba_num[6] = '-';
128 		pba_num[7] = 0;
129 		pba_num[8] = (pba_ptr >> 4) & 0xF;
130 		pba_num[9] = pba_ptr & 0xF;
131 
132 		/* put a null character on the end of our string */
133 		pba_num[10] = '\0';
134 
135 		/* switch all the data but the '-' to hex char */
136 		for (offset = 0; offset < 10; offset++) {
137 			if (pba_num[offset] < 0xA)
138 				pba_num[offset] += '0';
139 			else if (pba_num[offset] < 0x10)
140 				pba_num[offset] += 'A' - 0xA;
141 		}
142 
143 		return 0;
144 	}
145 
146 	ret_val = wx_read_ee_hostif(wx, pba_ptr, &length);
147 	if (ret_val != 0) {
148 		wx_err(wx, "NVM Read Error\n");
149 		return ret_val;
150 	}
151 
152 	if (length == 0xFFFF || length == 0) {
153 		wx_err(wx, "NVM PBA number section invalid length\n");
154 		return -EINVAL;
155 	}
156 
157 	/* check if pba_num buffer is big enough */
158 	if (pba_num_size  < (((u32)length * 2) - 1)) {
159 		wx_err(wx, "PBA string buffer too small\n");
160 		return -ENOMEM;
161 	}
162 
163 	/* trim pba length from start of string */
164 	pba_ptr++;
165 	length--;
166 
167 	for (offset = 0; offset < length; offset++) {
168 		ret_val = wx_read_ee_hostif(wx, pba_ptr + offset, &data);
169 		if (ret_val != 0) {
170 			wx_err(wx, "NVM Read Error\n");
171 			return ret_val;
172 		}
173 		pba_num[offset * 2] = (u8)(data >> 8);
174 		pba_num[(offset * 2) + 1] = (u8)(data & 0xFF);
175 	}
176 	pba_num[offset * 2] = '\0';
177 
178 	return 0;
179 }
180 
181 /**
182  *  txgbe_calc_eeprom_checksum - Calculates and returns the checksum
183  *  @wx: pointer to hardware structure
184  *  @checksum: pointer to cheksum
185  *
186  *  Returns a negative error code on error
187  **/
188 static int txgbe_calc_eeprom_checksum(struct wx *wx, u16 *checksum)
189 {
190 	u16 *eeprom_ptrs = NULL;
191 	u16 *local_buffer;
192 	int status;
193 	u16 i;
194 
195 	wx_init_eeprom_params(wx);
196 
197 	eeprom_ptrs = kvmalloc_array(TXGBE_EEPROM_LAST_WORD, sizeof(u16),
198 				     GFP_KERNEL);
199 	if (!eeprom_ptrs)
200 		return -ENOMEM;
201 	/* Read pointer area */
202 	status = wx_read_ee_hostif_buffer(wx, 0, TXGBE_EEPROM_LAST_WORD, eeprom_ptrs);
203 	if (status != 0) {
204 		wx_err(wx, "Failed to read EEPROM image\n");
205 		kvfree(eeprom_ptrs);
206 		return status;
207 	}
208 	local_buffer = eeprom_ptrs;
209 
210 	for (i = 0; i < TXGBE_EEPROM_LAST_WORD; i++)
211 		if (i != wx->eeprom.sw_region_offset + TXGBE_EEPROM_CHECKSUM)
212 			*checksum += local_buffer[i];
213 
214 	if (eeprom_ptrs)
215 		kvfree(eeprom_ptrs);
216 
217 	*checksum = TXGBE_EEPROM_SUM - *checksum;
218 
219 	return 0;
220 }
221 
222 /**
223  *  txgbe_validate_eeprom_checksum - Validate EEPROM checksum
224  *  @wx: pointer to hardware structure
225  *  @checksum_val: calculated checksum
226  *
227  *  Performs checksum calculation and validates the EEPROM checksum.  If the
228  *  caller does not need checksum_val, the value can be NULL.
229  **/
230 int txgbe_validate_eeprom_checksum(struct wx *wx, u16 *checksum_val)
231 {
232 	u16 read_checksum = 0;
233 	u16 checksum;
234 	int status;
235 
236 	/* Read the first word from the EEPROM. If this times out or fails, do
237 	 * not continue or we could be in for a very long wait while every
238 	 * EEPROM read fails
239 	 */
240 	status = wx_read_ee_hostif(wx, 0, &checksum);
241 	if (status) {
242 		wx_err(wx, "EEPROM read failed\n");
243 		return status;
244 	}
245 
246 	checksum = 0;
247 	status = txgbe_calc_eeprom_checksum(wx, &checksum);
248 	if (status != 0)
249 		return status;
250 
251 	status = wx_read_ee_hostif(wx, wx->eeprom.sw_region_offset +
252 				   TXGBE_EEPROM_CHECKSUM, &read_checksum);
253 	if (status != 0)
254 		return status;
255 
256 	/* Verify read checksum from EEPROM is the same as
257 	 * calculated checksum
258 	 */
259 	if (read_checksum != checksum) {
260 		status = -EIO;
261 		wx_err(wx, "Invalid EEPROM checksum\n");
262 	}
263 
264 	/* If the user cares, return the calculated checksum */
265 	if (checksum_val)
266 		*checksum_val = checksum;
267 
268 	return status;
269 }
270 
271 static void txgbe_reset_misc(struct wx *wx)
272 {
273 	wx_reset_misc(wx);
274 	txgbe_init_thermal_sensor_thresh(wx);
275 }
276 
277 /**
278  *  txgbe_reset_hw - Perform hardware reset
279  *  @wx: pointer to wx structure
280  *
281  *  Resets the hardware by resetting the transmit and receive units, masks
282  *  and clears all interrupts, perform a PHY reset, and perform a link (MAC)
283  *  reset.
284  **/
285 int txgbe_reset_hw(struct wx *wx)
286 {
287 	int status;
288 
289 	/* Call adapter stop to disable tx/rx and clear interrupts */
290 	status = wx_stop_adapter(wx);
291 	if (status != 0)
292 		return status;
293 
294 	if (wx->media_type != sp_media_copper) {
295 		u32 val;
296 
297 		val = WX_MIS_RST_LAN_RST(wx->bus.func);
298 		wr32(wx, WX_MIS_RST, val | rd32(wx, WX_MIS_RST));
299 		WX_WRITE_FLUSH(wx);
300 		usleep_range(10, 100);
301 	}
302 
303 	status = wx_check_flash_load(wx, TXGBE_SPI_ILDR_STATUS_LAN_SW_RST(wx->bus.func));
304 	if (status != 0)
305 		return status;
306 
307 	txgbe_reset_misc(wx);
308 
309 	/* Store the permanent mac address */
310 	wx_get_mac_addr(wx, wx->mac.perm_addr);
311 
312 	/* Store MAC address from RAR0, clear receive address registers, and
313 	 * clear the multicast table.  Also reset num_rar_entries to 128,
314 	 * since we modify this value when programming the SAN MAC address.
315 	 */
316 	wx->mac.num_rar_entries = TXGBE_SP_RAR_ENTRIES;
317 	wx_init_rx_addrs(wx);
318 
319 	pci_set_master(wx->pdev);
320 
321 	return 0;
322 }
323