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
nios_fw_version_show(struct device * dev,struct device_attribute * attr,char * buf)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
get_retimer_mode(struct n3000_nios * nn,unsigned int mode_stat_reg,unsigned int * retimer_mode)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
retimer_A_mode_show(struct device * dev,struct device_attribute * attr,char * buf)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
retimer_B_mode_show(struct device * dev,struct device_attribute * attr,char * buf)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
fec_mode_show(struct device * dev,struct device_attribute * attr,char * buf)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
n3000_nios_init_done_check(struct n3000_nios * nn)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
create_altera_spi_controller(struct n3000_nios * nn)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
destroy_altera_spi_controller(struct n3000_nios * nn)451 static void destroy_altera_spi_controller(struct n3000_nios *nn)
452 {
453 platform_device_unregister(nn->altera_spi);
454 }
455
n3000_nios_poll_stat_timeout(void __iomem * base,u64 * v)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
464 * image programming. The time based timeout checking will add too much
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
n3000_nios_reg_write(void * context,unsigned int reg,unsigned int val)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
n3000_nios_reg_read(void * context,unsigned int reg,unsigned int * val)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
n3000_nios_probe(struct dfl_device * ddev)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
n3000_nios_remove(struct dfl_device * ddev)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");
589