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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * DFL device driver for Nios private feature on Intel PAC (Programmable | |
4 | * Acceleration Card) N3000 | |
5 | * | |
6 | * Copyright (C) 2019-2020 Intel Corporation, Inc. | |
7 | * | |
8 | * Authors: | |
9 | * Wu Hao <hao.wu@intel.com> | |
10 | * Xu Yilun <yilun.xu@intel.com> | |
11 | */ | |
12 | #include <linux/bitfield.h> | |
13 | #include <linux/dfl.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/io-64-nonatomic-lo-hi.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/regmap.h> | |
21 | #include <linux/stddef.h> | |
22 | #include <linux/spi/altera.h> | |
23 | #include <linux/spi/spi.h> | |
24 | #include <linux/types.h> | |
25 | ||
26 | /* | |
27 | * N3000 Nios private feature registers, named as NIOS_SPI_XX on spec. | |
28 | * NS is the abbreviation of NIOS_SPI. | |
29 | */ | |
30 | #define N3000_NS_PARAM 0x8 | |
31 | #define N3000_NS_PARAM_SHIFT_MODE_MSK BIT_ULL(1) | |
32 | #define N3000_NS_PARAM_SHIFT_MODE_MSB 0 | |
33 | #define N3000_NS_PARAM_SHIFT_MODE_LSB 1 | |
34 | #define N3000_NS_PARAM_DATA_WIDTH GENMASK_ULL(7, 2) | |
35 | #define N3000_NS_PARAM_NUM_CS GENMASK_ULL(13, 8) | |
36 | #define N3000_NS_PARAM_CLK_POL BIT_ULL(14) | |
37 | #define N3000_NS_PARAM_CLK_PHASE BIT_ULL(15) | |
38 | #define N3000_NS_PARAM_PERIPHERAL_ID GENMASK_ULL(47, 32) | |
39 | ||
40 | #define N3000_NS_CTRL 0x10 | |
41 | #define N3000_NS_CTRL_WR_DATA GENMASK_ULL(31, 0) | |
42 | #define N3000_NS_CTRL_ADDR GENMASK_ULL(44, 32) | |
43 | #define N3000_NS_CTRL_CMD_MSK GENMASK_ULL(63, 62) | |
44 | #define N3000_NS_CTRL_CMD_NOP 0 | |
45 | #define N3000_NS_CTRL_CMD_RD 1 | |
46 | #define N3000_NS_CTRL_CMD_WR 2 | |
47 | ||
48 | #define N3000_NS_STAT 0x18 | |
49 | #define N3000_NS_STAT_RD_DATA GENMASK_ULL(31, 0) | |
50 | #define N3000_NS_STAT_RW_VAL BIT_ULL(32) | |
51 | ||
52 | /* Nios handshake registers, indirect access */ | |
53 | #define N3000_NIOS_INIT 0x1000 | |
54 | #define N3000_NIOS_INIT_DONE BIT(0) | |
55 | #define N3000_NIOS_INIT_START BIT(1) | |
56 | /* Mode for retimer A, link 0, the same below */ | |
57 | #define N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK GENMASK(9, 8) | |
58 | #define N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK GENMASK(11, 10) | |
59 | #define N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK GENMASK(13, 12) | |
60 | #define N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK GENMASK(15, 14) | |
61 | #define N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK GENMASK(17, 16) | |
62 | #define N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK GENMASK(19, 18) | |
63 | #define N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK GENMASK(21, 20) | |
64 | #define N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK GENMASK(23, 22) | |
65 | #define N3000_NIOS_INIT_REQ_FEC_MODE_NO 0x0 | |
66 | #define N3000_NIOS_INIT_REQ_FEC_MODE_KR 0x1 | |
67 | #define N3000_NIOS_INIT_REQ_FEC_MODE_RS 0x2 | |
68 | ||
69 | #define N3000_NIOS_FW_VERSION 0x1004 | |
70 | #define N3000_NIOS_FW_VERSION_PATCH GENMASK(23, 20) | |
71 | #define N3000_NIOS_FW_VERSION_MINOR GENMASK(27, 24) | |
72 | #define N3000_NIOS_FW_VERSION_MAJOR GENMASK(31, 28) | |
73 | ||
74 | /* The retimers we use on Intel PAC N3000 is Parkvale, abbreviated to PKVL */ | |
75 | #define N3000_NIOS_PKVL_A_MODE_STS 0x1020 | |
76 | #define N3000_NIOS_PKVL_B_MODE_STS 0x1024 | |
77 | #define N3000_NIOS_PKVL_MODE_STS_GROUP_MSK GENMASK(15, 8) | |
78 | #define N3000_NIOS_PKVL_MODE_STS_GROUP_OK 0x0 | |
79 | #define N3000_NIOS_PKVL_MODE_STS_ID_MSK GENMASK(7, 0) | |
80 | /* When GROUP MASK field == GROUP_OK */ | |
81 | #define N3000_NIOS_PKVL_MODE_ID_RESET 0x0 | |
82 | #define N3000_NIOS_PKVL_MODE_ID_4X10G 0x1 | |
83 | #define N3000_NIOS_PKVL_MODE_ID_4X25G 0x2 | |
84 | #define N3000_NIOS_PKVL_MODE_ID_2X25G 0x3 | |
85 | #define N3000_NIOS_PKVL_MODE_ID_2X25G_2X10G 0x4 | |
86 | #define N3000_NIOS_PKVL_MODE_ID_1X25G 0x5 | |
87 | ||
88 | #define N3000_NIOS_REGBUS_RETRY_COUNT 10000 /* loop count */ | |
89 | ||
90 | #define N3000_NIOS_INIT_TIMEOUT 10000000 /* usec */ | |
91 | #define N3000_NIOS_INIT_TIME_INTV 100000 /* usec */ | |
92 | ||
93 | #define N3000_NIOS_INIT_REQ_FEC_MODE_MSK_ALL \ | |
94 | (N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK | \ | |
95 | N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK | \ | |
96 | N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK | \ | |
97 | N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK | \ | |
98 | N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK | \ | |
99 | N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK | \ | |
100 | N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK | \ | |
101 | N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK) | |
102 | ||
103 | #define N3000_NIOS_INIT_REQ_FEC_MODE_NO_ALL \ | |
104 | (FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK, \ | |
105 | N3000_NIOS_INIT_REQ_FEC_MODE_NO) | \ | |
106 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK, \ | |
107 | N3000_NIOS_INIT_REQ_FEC_MODE_NO) | \ | |
108 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK, \ | |
109 | N3000_NIOS_INIT_REQ_FEC_MODE_NO) | \ | |
110 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK, \ | |
111 | N3000_NIOS_INIT_REQ_FEC_MODE_NO) | \ | |
112 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK, \ | |
113 | N3000_NIOS_INIT_REQ_FEC_MODE_NO) | \ | |
114 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK, \ | |
115 | N3000_NIOS_INIT_REQ_FEC_MODE_NO) | \ | |
116 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK, \ | |
117 | N3000_NIOS_INIT_REQ_FEC_MODE_NO) | \ | |
118 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK, \ | |
119 | N3000_NIOS_INIT_REQ_FEC_MODE_NO)) | |
120 | ||
121 | #define N3000_NIOS_INIT_REQ_FEC_MODE_KR_ALL \ | |
122 | (FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK, \ | |
123 | N3000_NIOS_INIT_REQ_FEC_MODE_KR) | \ | |
124 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK, \ | |
125 | N3000_NIOS_INIT_REQ_FEC_MODE_KR) | \ | |
126 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK, \ | |
127 | N3000_NIOS_INIT_REQ_FEC_MODE_KR) | \ | |
128 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK, \ | |
129 | N3000_NIOS_INIT_REQ_FEC_MODE_KR) | \ | |
130 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK, \ | |
131 | N3000_NIOS_INIT_REQ_FEC_MODE_KR) | \ | |
132 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK, \ | |
133 | N3000_NIOS_INIT_REQ_FEC_MODE_KR) | \ | |
134 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK, \ | |
135 | N3000_NIOS_INIT_REQ_FEC_MODE_KR) | \ | |
136 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK, \ | |
137 | N3000_NIOS_INIT_REQ_FEC_MODE_KR)) | |
138 | ||
139 | #define N3000_NIOS_INIT_REQ_FEC_MODE_RS_ALL \ | |
140 | (FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A0_MSK, \ | |
141 | N3000_NIOS_INIT_REQ_FEC_MODE_RS) | \ | |
142 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A1_MSK, \ | |
143 | N3000_NIOS_INIT_REQ_FEC_MODE_RS) | \ | |
144 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A2_MSK, \ | |
145 | N3000_NIOS_INIT_REQ_FEC_MODE_RS) | \ | |
146 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_A3_MSK, \ | |
147 | N3000_NIOS_INIT_REQ_FEC_MODE_RS) | \ | |
148 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B0_MSK, \ | |
149 | N3000_NIOS_INIT_REQ_FEC_MODE_RS) | \ | |
150 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B1_MSK, \ | |
151 | N3000_NIOS_INIT_REQ_FEC_MODE_RS) | \ | |
152 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B2_MSK, \ | |
153 | N3000_NIOS_INIT_REQ_FEC_MODE_RS) | \ | |
154 | FIELD_PREP(N3000_NIOS_INIT_REQ_FEC_MODE_B3_MSK, \ | |
155 | N3000_NIOS_INIT_REQ_FEC_MODE_RS)) | |
156 | ||
157 | struct n3000_nios { | |
158 | void __iomem *base; | |
159 | struct regmap *regmap; | |
160 | struct device *dev; | |
161 | struct platform_device *altera_spi; | |
162 | }; | |
163 | ||
164 | static ssize_t nios_fw_version_show(struct device *dev, | |
165 | struct device_attribute *attr, char *buf) | |
166 | { | |
167 | struct n3000_nios *nn = dev_get_drvdata(dev); | |
168 | unsigned int val; | |
169 | int ret; | |
170 | ||
171 | ret = regmap_read(nn->regmap, N3000_NIOS_FW_VERSION, &val); | |
172 | if (ret) | |
173 | return ret; | |
174 | ||
175 | return sysfs_emit(buf, "%x.%x.%x\n", | |
176 | (u8)FIELD_GET(N3000_NIOS_FW_VERSION_MAJOR, val), | |
177 | (u8)FIELD_GET(N3000_NIOS_FW_VERSION_MINOR, val), | |
178 | (u8)FIELD_GET(N3000_NIOS_FW_VERSION_PATCH, val)); | |
179 | } | |
180 | static DEVICE_ATTR_RO(nios_fw_version); | |
181 | ||
182 | #define IS_MODE_STATUS_OK(mode_stat) \ | |
183 | (FIELD_GET(N3000_NIOS_PKVL_MODE_STS_GROUP_MSK, (mode_stat)) == \ | |
184 | N3000_NIOS_PKVL_MODE_STS_GROUP_OK) | |
185 | ||
186 | #define IS_RETIMER_FEC_SUPPORTED(retimer_mode) \ | |
187 | ((retimer_mode) != N3000_NIOS_PKVL_MODE_ID_RESET && \ | |
188 | (retimer_mode) != N3000_NIOS_PKVL_MODE_ID_4X10G) | |
189 | ||
190 | static int get_retimer_mode(struct n3000_nios *nn, unsigned int mode_stat_reg, | |
191 | unsigned int *retimer_mode) | |
192 | { | |
193 | unsigned int val; | |
194 | int ret; | |
195 | ||
196 | ret = regmap_read(nn->regmap, mode_stat_reg, &val); | |
197 | if (ret) | |
198 | return ret; | |
199 | ||
200 | if (!IS_MODE_STATUS_OK(val)) | |
201 | return -EFAULT; | |
202 | ||
203 | *retimer_mode = FIELD_GET(N3000_NIOS_PKVL_MODE_STS_ID_MSK, val); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static ssize_t retimer_A_mode_show(struct device *dev, | |
209 | struct device_attribute *attr, char *buf) | |
210 | { | |
211 | struct n3000_nios *nn = dev_get_drvdata(dev); | |
212 | unsigned int mode; | |
213 | int ret; | |
214 | ||
215 | ret = get_retimer_mode(nn, N3000_NIOS_PKVL_A_MODE_STS, &mode); | |
216 | if (ret) | |
217 | return ret; | |
218 | ||
219 | return sysfs_emit(buf, "0x%x\n", mode); | |
220 | } | |
221 | static DEVICE_ATTR_RO(retimer_A_mode); | |
222 | ||
223 | static ssize_t retimer_B_mode_show(struct device *dev, | |
224 | struct device_attribute *attr, char *buf) | |
225 | { | |
226 | struct n3000_nios *nn = dev_get_drvdata(dev); | |
227 | unsigned int mode; | |
228 | int ret; | |
229 | ||
230 | ret = get_retimer_mode(nn, N3000_NIOS_PKVL_B_MODE_STS, &mode); | |
231 | if (ret) | |
232 | return ret; | |
233 | ||
234 | return sysfs_emit(buf, "0x%x\n", mode); | |
235 | } | |
236 | static DEVICE_ATTR_RO(retimer_B_mode); | |
237 | ||
238 | static ssize_t fec_mode_show(struct device *dev, | |
239 | struct device_attribute *attr, char *buf) | |
240 | { | |
241 | unsigned int val, retimer_a_mode, retimer_b_mode, fec_modes; | |
242 | struct n3000_nios *nn = dev_get_drvdata(dev); | |
243 | int ret; | |
244 | ||
245 | /* FEC mode setting is not supported in early FW versions */ | |
246 | ret = regmap_read(nn->regmap, N3000_NIOS_FW_VERSION, &val); | |
247 | if (ret) | |
248 | return ret; | |
249 | ||
250 | if (FIELD_GET(N3000_NIOS_FW_VERSION_MAJOR, val) < 3) | |
251 | return sysfs_emit(buf, "not supported\n"); | |
252 | ||
253 | /* If no 25G links, FEC mode setting is not supported either */ | |
254 | ret = get_retimer_mode(nn, N3000_NIOS_PKVL_A_MODE_STS, &retimer_a_mode); | |
255 | if (ret) | |
256 | return ret; | |
257 | ||
258 | ret = get_retimer_mode(nn, N3000_NIOS_PKVL_B_MODE_STS, &retimer_b_mode); | |
259 | if (ret) | |
260 | return ret; | |
261 | ||
262 | if (!IS_RETIMER_FEC_SUPPORTED(retimer_a_mode) && | |
263 | !IS_RETIMER_FEC_SUPPORTED(retimer_b_mode)) | |
264 | return sysfs_emit(buf, "not supported\n"); | |
265 | ||
266 | /* get the valid FEC mode for 25G links */ | |
267 | ret = regmap_read(nn->regmap, N3000_NIOS_INIT, &val); | |
268 | if (ret) | |
269 | return ret; | |
270 | ||
271 | /* | |
272 | * FEC mode should always be the same for all links, as we set them | |
273 | * in this way. | |
274 | */ | |
275 | fec_modes = (val & N3000_NIOS_INIT_REQ_FEC_MODE_MSK_ALL); | |
276 | if (fec_modes == N3000_NIOS_INIT_REQ_FEC_MODE_NO_ALL) | |
277 | return sysfs_emit(buf, "no\n"); | |
278 | else if (fec_modes == N3000_NIOS_INIT_REQ_FEC_MODE_KR_ALL) | |
279 | return sysfs_emit(buf, "kr\n"); | |
280 | else if (fec_modes == N3000_NIOS_INIT_REQ_FEC_MODE_RS_ALL) | |
281 | return sysfs_emit(buf, "rs\n"); | |
282 | ||
283 | return -EFAULT; | |
284 | } | |
285 | static DEVICE_ATTR_RO(fec_mode); | |
286 | ||
287 | static struct attribute *n3000_nios_attrs[] = { | |
288 | &dev_attr_nios_fw_version.attr, | |
289 | &dev_attr_retimer_A_mode.attr, | |
290 | &dev_attr_retimer_B_mode.attr, | |
291 | &dev_attr_fec_mode.attr, | |
292 | NULL, | |
293 | }; | |
294 | ATTRIBUTE_GROUPS(n3000_nios); | |
295 | ||
296 | static int n3000_nios_init_done_check(struct n3000_nios *nn) | |
297 | { | |
298 | unsigned int val, state_a, state_b; | |
299 | struct device *dev = nn->dev; | |
300 | int ret, ret2; | |
301 | ||
302 | /* | |
303 | * The SPI is shared by the Nios core inside the FPGA, Nios will use | |
304 | * this SPI master to do some one time initialization after power up, | |
305 | * and then release the control to OS. The driver needs to poll on | |
306 | * INIT_DONE to see when driver could take the control. | |
307 | * | |
308 | * Please note that after Nios firmware version 3.0.0, INIT_START is | |
309 | * introduced, so driver needs to trigger START firstly and then check | |
310 | * INIT_DONE. | |
311 | */ | |
312 | ||
313 | ret = regmap_read(nn->regmap, N3000_NIOS_FW_VERSION, &val); | |
314 | if (ret) | |
315 | return ret; | |
316 | ||
317 | /* | |
318 | * If Nios version register is totally uninitialized(== 0x0), then the | |
319 | * Nios firmware is missing. So host could take control of SPI master | |
320 | * safely, but initialization work for Nios is not done. To restore the | |
321 | * card, we need to reprogram a new Nios firmware via the BMC chip on | |
322 | * SPI bus. So the driver doesn't error out, it continues to create the | |
323 | * spi controller device and spi_board_info for BMC. | |
324 | */ | |
325 | if (val == 0) { | |
326 | dev_err(dev, "Nios version reg = 0x%x, skip INIT_DONE check, but the retimer may be uninitialized\n", | |
327 | val); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | if (FIELD_GET(N3000_NIOS_FW_VERSION_MAJOR, val) >= 3) { | |
332 | /* read NIOS_INIT to check if retimer initialization is done */ | |
333 | ret = regmap_read(nn->regmap, N3000_NIOS_INIT, &val); | |
334 | if (ret) | |
335 | return ret; | |
336 | ||
337 | /* check if retimers are initialized already */ | |
338 | if (val & (N3000_NIOS_INIT_DONE | N3000_NIOS_INIT_START)) | |
339 | goto nios_init_done; | |
340 | ||
341 | /* configure FEC mode per module param */ | |
342 | val = N3000_NIOS_INIT_START; | |
343 | ||
344 | /* | |
345 | * When the retimer is to be set to 10G mode, there is no FEC | |
346 | * mode setting, so the REQ_FEC_MODE field will be ignored by | |
347 | * Nios firmware in this case. But we should still fill the FEC | |
348 | * mode field cause host could not get the retimer working mode | |
349 | * until the Nios init is done. | |
350 | * | |
351 | * For now the driver doesn't support the retimer FEC mode | |
352 | * switching per user's request. It is always set to Reed | |
353 | * Solomon FEC. | |
354 | * | |
355 | * The driver will set the same FEC mode for all links. | |
356 | */ | |
357 | val |= N3000_NIOS_INIT_REQ_FEC_MODE_RS_ALL; | |
358 | ||
359 | ret = regmap_write(nn->regmap, N3000_NIOS_INIT, val); | |
360 | if (ret) | |
361 | return ret; | |
362 | } | |
363 | ||
364 | nios_init_done: | |
365 | /* polls on NIOS_INIT_DONE */ | |
366 | ret = regmap_read_poll_timeout(nn->regmap, N3000_NIOS_INIT, val, | |
367 | val & N3000_NIOS_INIT_DONE, | |
368 | N3000_NIOS_INIT_TIME_INTV, | |
369 | N3000_NIOS_INIT_TIMEOUT); | |
370 | if (ret) | |
371 | dev_err(dev, "NIOS_INIT_DONE %s\n", | |
372 | (ret == -ETIMEDOUT) ? "timed out" : "check error"); | |
373 | ||
374 | ret2 = regmap_read(nn->regmap, N3000_NIOS_PKVL_A_MODE_STS, &state_a); | |
375 | if (ret2) | |
376 | return ret2; | |
377 | ||
378 | ret2 = regmap_read(nn->regmap, N3000_NIOS_PKVL_B_MODE_STS, &state_b); | |
379 | if (ret2) | |
380 | return ret2; | |
381 | ||
382 | if (!ret) { | |
383 | /* | |
384 | * After INIT_DONE is detected, it still needs to check if the | |
385 | * Nios firmware reports any error during the retimer | |
386 | * configuration. | |
387 | */ | |
388 | if (IS_MODE_STATUS_OK(state_a) && IS_MODE_STATUS_OK(state_b)) | |
389 | return 0; | |
390 | ||
391 | /* | |
392 | * If the retimer configuration is failed, the Nios firmware | |
393 | * will still release the spi controller for host to | |
394 | * communicate with the BMC. It makes possible for people to | |
395 | * reprogram a new Nios firmware and restore the card. So the | |
396 | * driver doesn't error out, it continues to create the spi | |
397 | * controller device and spi_board_info for BMC. | |
398 | */ | |
399 | dev_err(dev, "NIOS_INIT_DONE OK, but err on retimer init\n"); | |
400 | } | |
401 | ||
402 | dev_err(nn->dev, "PKVL_A_MODE_STS 0x%x\n", state_a); | |
403 | dev_err(nn->dev, "PKVL_B_MODE_STS 0x%x\n", state_b); | |
404 | ||
405 | return ret; | |
406 | } | |
407 | ||
408 | static struct spi_board_info m10_n3000_info = { | |
409 | .modalias = "m10-n3000", | |
410 | .max_speed_hz = 12500000, | |
411 | .bus_num = 0, | |
412 | .chip_select = 0, | |
413 | }; | |
414 | ||
415 | static int create_altera_spi_controller(struct n3000_nios *nn) | |
416 | { | |
417 | struct altera_spi_platform_data pdata = { 0 }; | |
418 | struct platform_device_info pdevinfo = { 0 }; | |
419 | void __iomem *base = nn->base; | |
420 | u64 v; | |
421 | ||
422 | v = readq(base + N3000_NS_PARAM); | |
423 | ||
424 | pdata.mode_bits = SPI_CS_HIGH; | |
425 | if (FIELD_GET(N3000_NS_PARAM_CLK_POL, v)) | |
426 | pdata.mode_bits |= SPI_CPOL; | |
427 | if (FIELD_GET(N3000_NS_PARAM_CLK_PHASE, v)) | |
428 | pdata.mode_bits |= SPI_CPHA; | |
429 | ||
430 | pdata.num_chipselect = FIELD_GET(N3000_NS_PARAM_NUM_CS, v); | |
431 | pdata.bits_per_word_mask = | |
432 | SPI_BPW_RANGE_MASK(1, FIELD_GET(N3000_NS_PARAM_DATA_WIDTH, v)); | |
433 | ||
434 | pdata.num_devices = 1; | |
435 | pdata.devices = &m10_n3000_info; | |
436 | ||
437 | dev_dbg(nn->dev, "%s cs %u bpm 0x%x mode 0x%x\n", __func__, | |
438 | pdata.num_chipselect, pdata.bits_per_word_mask, | |
439 | pdata.mode_bits); | |
440 | ||
441 | pdevinfo.name = "subdev_spi_altera"; | |
442 | pdevinfo.id = PLATFORM_DEVID_AUTO; | |
443 | pdevinfo.parent = nn->dev; | |
444 | pdevinfo.data = &pdata; | |
445 | pdevinfo.size_data = sizeof(pdata); | |
446 | ||
447 | nn->altera_spi = platform_device_register_full(&pdevinfo); | |
448 | return PTR_ERR_OR_ZERO(nn->altera_spi); | |
449 | } | |
450 | ||
451 | static void destroy_altera_spi_controller(struct n3000_nios *nn) | |
452 | { | |
453 | platform_device_unregister(nn->altera_spi); | |
454 | } | |
455 | ||
456 | static int n3000_nios_poll_stat_timeout(void __iomem *base, u64 *v) | |
457 | { | |
458 | int loops; | |
459 | ||
460 | /* | |
461 | * We don't use the time based timeout here for performance. | |
462 | * | |
463 | * The regbus read/write is on the critical path of Intel PAC N3000 | |
580e3137 | 464 | * image programming. The time based timeout checking will add too much |
56172ab3 XY |
465 | * overhead on it. Usually the state changes in 1 or 2 loops on the |
466 | * test server, and we set 10000 times loop here for safety. | |
467 | */ | |
468 | for (loops = N3000_NIOS_REGBUS_RETRY_COUNT; loops > 0 ; loops--) { | |
469 | *v = readq(base + N3000_NS_STAT); | |
470 | if (*v & N3000_NS_STAT_RW_VAL) | |
471 | break; | |
472 | cpu_relax(); | |
473 | } | |
474 | ||
475 | return (loops > 0) ? 0 : -ETIMEDOUT; | |
476 | } | |
477 | ||
478 | static int n3000_nios_reg_write(void *context, unsigned int reg, unsigned int val) | |
479 | { | |
480 | struct n3000_nios *nn = context; | |
481 | u64 v; | |
482 | int ret; | |
483 | ||
484 | v = FIELD_PREP(N3000_NS_CTRL_CMD_MSK, N3000_NS_CTRL_CMD_WR) | | |
485 | FIELD_PREP(N3000_NS_CTRL_ADDR, reg) | | |
486 | FIELD_PREP(N3000_NS_CTRL_WR_DATA, val); | |
487 | writeq(v, nn->base + N3000_NS_CTRL); | |
488 | ||
489 | ret = n3000_nios_poll_stat_timeout(nn->base, &v); | |
490 | if (ret) | |
491 | dev_err(nn->dev, "fail to write reg 0x%x val 0x%x: %d\n", | |
492 | reg, val, ret); | |
493 | ||
494 | return ret; | |
495 | } | |
496 | ||
497 | static int n3000_nios_reg_read(void *context, unsigned int reg, unsigned int *val) | |
498 | { | |
499 | struct n3000_nios *nn = context; | |
500 | u64 v; | |
501 | int ret; | |
502 | ||
503 | v = FIELD_PREP(N3000_NS_CTRL_CMD_MSK, N3000_NS_CTRL_CMD_RD) | | |
504 | FIELD_PREP(N3000_NS_CTRL_ADDR, reg); | |
505 | writeq(v, nn->base + N3000_NS_CTRL); | |
506 | ||
507 | ret = n3000_nios_poll_stat_timeout(nn->base, &v); | |
508 | if (ret) | |
509 | dev_err(nn->dev, "fail to read reg 0x%x: %d\n", reg, ret); | |
510 | else | |
511 | *val = FIELD_GET(N3000_NS_STAT_RD_DATA, v); | |
512 | ||
513 | return ret; | |
514 | } | |
515 | ||
516 | static const struct regmap_config n3000_nios_regbus_cfg = { | |
517 | .reg_bits = 32, | |
518 | .reg_stride = 4, | |
519 | .val_bits = 32, | |
520 | .fast_io = true, | |
521 | ||
522 | .reg_write = n3000_nios_reg_write, | |
523 | .reg_read = n3000_nios_reg_read, | |
524 | }; | |
525 | ||
526 | static int n3000_nios_probe(struct dfl_device *ddev) | |
527 | { | |
528 | struct device *dev = &ddev->dev; | |
529 | struct n3000_nios *nn; | |
530 | int ret; | |
531 | ||
532 | nn = devm_kzalloc(dev, sizeof(*nn), GFP_KERNEL); | |
533 | if (!nn) | |
534 | return -ENOMEM; | |
535 | ||
536 | dev_set_drvdata(&ddev->dev, nn); | |
537 | ||
538 | nn->dev = dev; | |
539 | ||
540 | nn->base = devm_ioremap_resource(&ddev->dev, &ddev->mmio_res); | |
541 | if (IS_ERR(nn->base)) | |
542 | return PTR_ERR(nn->base); | |
543 | ||
544 | nn->regmap = devm_regmap_init(dev, NULL, nn, &n3000_nios_regbus_cfg); | |
545 | if (IS_ERR(nn->regmap)) | |
546 | return PTR_ERR(nn->regmap); | |
547 | ||
548 | ret = n3000_nios_init_done_check(nn); | |
549 | if (ret) | |
550 | return ret; | |
551 | ||
552 | ret = create_altera_spi_controller(nn); | |
553 | if (ret) | |
554 | dev_err(dev, "altera spi controller create failed: %d\n", ret); | |
555 | ||
556 | return ret; | |
557 | } | |
558 | ||
559 | static void n3000_nios_remove(struct dfl_device *ddev) | |
560 | { | |
561 | struct n3000_nios *nn = dev_get_drvdata(&ddev->dev); | |
562 | ||
563 | destroy_altera_spi_controller(nn); | |
564 | } | |
565 | ||
566 | #define FME_FEATURE_ID_N3000_NIOS 0xd | |
567 | ||
568 | static const struct dfl_device_id n3000_nios_ids[] = { | |
569 | { FME_ID, FME_FEATURE_ID_N3000_NIOS }, | |
570 | { } | |
571 | }; | |
572 | MODULE_DEVICE_TABLE(dfl, n3000_nios_ids); | |
573 | ||
574 | static struct dfl_driver n3000_nios_driver = { | |
575 | .drv = { | |
576 | .name = "dfl-n3000-nios", | |
577 | .dev_groups = n3000_nios_groups, | |
578 | }, | |
579 | .id_table = n3000_nios_ids, | |
580 | .probe = n3000_nios_probe, | |
581 | .remove = n3000_nios_remove, | |
582 | }; | |
583 | ||
584 | module_dfl_driver(n3000_nios_driver); | |
585 | ||
586 | MODULE_DESCRIPTION("Driver for Nios private feature on Intel PAC N3000"); | |
587 | MODULE_AUTHOR("Intel Corporation"); | |
588 | MODULE_LICENSE("GPL v2"); |