1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2021-2022 NVIDIA Corporation
4 *
5 * Author: Dipen Patel <dipenp@nvidia.com>
6 */
7
8 #include <linux/err.h>
9 #include <linux/io.h>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/stat.h>
13 #include <linux/interrupt.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/hte.h>
17 #include <linux/uaccess.h>
18 #include <linux/gpio/driver.h>
19 #include <linux/gpio/consumer.h>
20
21 #define HTE_SUSPEND 0
22
23 /* HTE source clock TSC is 31.25MHz */
24 #define HTE_TS_CLK_RATE_HZ 31250000ULL
25 #define HTE_CLK_RATE_NS 32
26 #define HTE_TS_NS_SHIFT __builtin_ctz(HTE_CLK_RATE_NS)
27
28 #define NV_AON_SLICE_INVALID -1
29 #define NV_LINES_IN_SLICE 32
30
31 /* AON HTE line map For slice 1 */
32 #define NV_AON_HTE_SLICE1_IRQ_GPIO_28 12
33 #define NV_AON_HTE_SLICE1_IRQ_GPIO_29 13
34
35 /* AON HTE line map For slice 2 */
36 #define NV_AON_HTE_SLICE2_IRQ_GPIO_0 0
37 #define NV_AON_HTE_SLICE2_IRQ_GPIO_1 1
38 #define NV_AON_HTE_SLICE2_IRQ_GPIO_2 2
39 #define NV_AON_HTE_SLICE2_IRQ_GPIO_3 3
40 #define NV_AON_HTE_SLICE2_IRQ_GPIO_4 4
41 #define NV_AON_HTE_SLICE2_IRQ_GPIO_5 5
42 #define NV_AON_HTE_SLICE2_IRQ_GPIO_6 6
43 #define NV_AON_HTE_SLICE2_IRQ_GPIO_7 7
44 #define NV_AON_HTE_SLICE2_IRQ_GPIO_8 8
45 #define NV_AON_HTE_SLICE2_IRQ_GPIO_9 9
46 #define NV_AON_HTE_SLICE2_IRQ_GPIO_10 10
47 #define NV_AON_HTE_SLICE2_IRQ_GPIO_11 11
48 #define NV_AON_HTE_SLICE2_IRQ_GPIO_12 12
49 #define NV_AON_HTE_SLICE2_IRQ_GPIO_13 13
50 #define NV_AON_HTE_SLICE2_IRQ_GPIO_14 14
51 #define NV_AON_HTE_SLICE2_IRQ_GPIO_15 15
52 #define NV_AON_HTE_SLICE2_IRQ_GPIO_16 16
53 #define NV_AON_HTE_SLICE2_IRQ_GPIO_17 17
54 #define NV_AON_HTE_SLICE2_IRQ_GPIO_18 18
55 #define NV_AON_HTE_SLICE2_IRQ_GPIO_19 19
56 #define NV_AON_HTE_SLICE2_IRQ_GPIO_20 20
57 #define NV_AON_HTE_SLICE2_IRQ_GPIO_21 21
58 #define NV_AON_HTE_SLICE2_IRQ_GPIO_22 22
59 #define NV_AON_HTE_SLICE2_IRQ_GPIO_23 23
60 #define NV_AON_HTE_SLICE2_IRQ_GPIO_24 24
61 #define NV_AON_HTE_SLICE2_IRQ_GPIO_25 25
62 #define NV_AON_HTE_SLICE2_IRQ_GPIO_26 26
63 #define NV_AON_HTE_SLICE2_IRQ_GPIO_27 27
64 #define NV_AON_HTE_SLICE2_IRQ_GPIO_28 28
65 #define NV_AON_HTE_SLICE2_IRQ_GPIO_29 29
66 #define NV_AON_HTE_SLICE2_IRQ_GPIO_30 30
67 #define NV_AON_HTE_SLICE2_IRQ_GPIO_31 31
68
69 #define HTE_TECTRL 0x0
70 #define HTE_TETSCH 0x4
71 #define HTE_TETSCL 0x8
72 #define HTE_TESRC 0xC
73 #define HTE_TECCV 0x10
74 #define HTE_TEPCV 0x14
75 #define HTE_TECMD 0x1C
76 #define HTE_TESTATUS 0x20
77 #define HTE_SLICE0_TETEN 0x40
78 #define HTE_SLICE1_TETEN 0x60
79
80 #define HTE_SLICE_SIZE (HTE_SLICE1_TETEN - HTE_SLICE0_TETEN)
81
82 #define HTE_TECTRL_ENABLE_ENABLE 0x1
83
84 #define HTE_TECTRL_OCCU_SHIFT 0x8
85 #define HTE_TECTRL_INTR_SHIFT 0x1
86 #define HTE_TECTRL_INTR_ENABLE 0x1
87
88 #define HTE_TESRC_SLICE_SHIFT 16
89 #define HTE_TESRC_SLICE_DEFAULT_MASK 0xFF
90
91 #define HTE_TECMD_CMD_POP 0x1
92
93 #define HTE_TESTATUS_OCCUPANCY_SHIFT 8
94 #define HTE_TESTATUS_OCCUPANCY_MASK 0xFF
95
96 enum tegra_hte_type {
97 HTE_TEGRA_TYPE_GPIO = 1U << 0,
98 HTE_TEGRA_TYPE_LIC = 1U << 1,
99 };
100
101 struct hte_slices {
102 u32 r_val;
103 unsigned long flags;
104 /* to prevent lines mapped to same slice updating its register */
105 spinlock_t s_lock;
106 };
107
108 struct tegra_hte_line_mapped {
109 int slice;
110 u32 bit_index;
111 };
112
113 struct tegra_hte_line_data {
114 unsigned long flags;
115 void *data;
116 };
117
118 struct tegra_hte_data {
119 enum tegra_hte_type type;
120 u32 slices;
121 u32 map_sz;
122 u32 sec_map_sz;
123 const struct tegra_hte_line_mapped *map;
124 const struct tegra_hte_line_mapped *sec_map;
125 };
126
127 struct tegra_hte_soc {
128 int hte_irq;
129 u32 itr_thrshld;
130 u32 conf_rval;
131 struct hte_slices *sl;
132 const struct tegra_hte_data *prov_data;
133 struct tegra_hte_line_data *line_data;
134 struct hte_chip *chip;
135 struct gpio_device *gdev;
136 void __iomem *regs;
137 };
138
139 static const struct tegra_hte_line_mapped tegra194_aon_gpio_map[] = {
140 /* gpio, slice, bit_index */
141 /* AA port */
142 [0] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_11},
143 [1] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_10},
144 [2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_9},
145 [3] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_8},
146 [4] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_7},
147 [5] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_6},
148 [6] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_5},
149 [7] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_4},
150 /* BB port */
151 [8] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_3},
152 [9] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_2},
153 [10] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_1},
154 [11] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_0},
155 /* CC port */
156 [12] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_22},
157 [13] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_21},
158 [14] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_20},
159 [15] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_19},
160 [16] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_18},
161 [17] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_17},
162 [18] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_16},
163 [19] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_15},
164 /* DD port */
165 [20] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_14},
166 [21] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_13},
167 [22] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_12},
168 /* EE port */
169 [23] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_29},
170 [24] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_28},
171 [25] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_27},
172 [26] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_26},
173 [27] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_25},
174 [28] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_24},
175 [29] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_23},
176 };
177
178 static const struct tegra_hte_line_mapped tegra194_aon_gpio_sec_map[] = {
179 /* gpio, slice, bit_index */
180 /* AA port */
181 [0] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_11},
182 [1] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_10},
183 [2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_9},
184 [3] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_8},
185 [4] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_7},
186 [5] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_6},
187 [6] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_5},
188 [7] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_4},
189 /* BB port */
190 [8] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_3},
191 [9] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_2},
192 [10] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_1},
193 [11] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_0},
194 [12] = {NV_AON_SLICE_INVALID, 0},
195 [13] = {NV_AON_SLICE_INVALID, 0},
196 [14] = {NV_AON_SLICE_INVALID, 0},
197 [15] = {NV_AON_SLICE_INVALID, 0},
198 /* CC port */
199 [16] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_22},
200 [17] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_21},
201 [18] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_20},
202 [19] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_19},
203 [20] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_18},
204 [21] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_17},
205 [22] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_16},
206 [23] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_15},
207 /* DD port */
208 [24] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_14},
209 [25] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_13},
210 [26] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_12},
211 [27] = {NV_AON_SLICE_INVALID, 0},
212 [28] = {NV_AON_SLICE_INVALID, 0},
213 [29] = {NV_AON_SLICE_INVALID, 0},
214 [30] = {NV_AON_SLICE_INVALID, 0},
215 [31] = {NV_AON_SLICE_INVALID, 0},
216 /* EE port */
217 [32] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_29},
218 [33] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_28},
219 [34] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_27},
220 [35] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_26},
221 [36] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_25},
222 [37] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_24},
223 [38] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_23},
224 [39] = {NV_AON_SLICE_INVALID, 0},
225 };
226
227 static const struct tegra_hte_line_mapped tegra234_aon_gpio_map[] = {
228 /* gpio, slice, bit_index */
229 /* AA port */
230 [0] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_11},
231 [1] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_10},
232 [2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_9},
233 [3] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_8},
234 [4] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_7},
235 [5] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_6},
236 [6] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_5},
237 [7] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_4},
238 /* BB port */
239 [8] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_3},
240 [9] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_2},
241 [10] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_1},
242 [11] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_0},
243 /* CC port */
244 [12] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_22},
245 [13] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_21},
246 [14] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_20},
247 [15] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_19},
248 [16] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_18},
249 [17] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_17},
250 [18] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_16},
251 [19] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_15},
252 /* DD port */
253 [20] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_14},
254 [21] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_13},
255 [22] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_12},
256 /* EE port */
257 [23] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_31},
258 [24] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_30},
259 [25] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_29},
260 [26] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_28},
261 [27] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_27},
262 [28] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_26},
263 [29] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_25},
264 [30] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_24},
265 /* GG port */
266 [31] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_23},
267 };
268
269 static const struct tegra_hte_line_mapped tegra234_aon_gpio_sec_map[] = {
270 /* gpio, slice, bit_index */
271 /* AA port */
272 [0] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_11},
273 [1] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_10},
274 [2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_9},
275 [3] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_8},
276 [4] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_7},
277 [5] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_6},
278 [6] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_5},
279 [7] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_4},
280 /* BB port */
281 [8] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_3},
282 [9] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_2},
283 [10] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_1},
284 [11] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_0},
285 [12] = {NV_AON_SLICE_INVALID, 0},
286 [13] = {NV_AON_SLICE_INVALID, 0},
287 [14] = {NV_AON_SLICE_INVALID, 0},
288 [15] = {NV_AON_SLICE_INVALID, 0},
289 /* CC port */
290 [16] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_22},
291 [17] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_21},
292 [18] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_20},
293 [19] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_19},
294 [20] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_18},
295 [21] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_17},
296 [22] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_16},
297 [23] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_15},
298 /* DD port */
299 [24] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_14},
300 [25] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_13},
301 [26] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_12},
302 [27] = {NV_AON_SLICE_INVALID, 0},
303 [28] = {NV_AON_SLICE_INVALID, 0},
304 [29] = {NV_AON_SLICE_INVALID, 0},
305 [30] = {NV_AON_SLICE_INVALID, 0},
306 [31] = {NV_AON_SLICE_INVALID, 0},
307 /* EE port */
308 [32] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_31},
309 [33] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_30},
310 [34] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_29},
311 [35] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_28},
312 [36] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_27},
313 [37] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_26},
314 [38] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_25},
315 [39] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_24},
316 /* GG port */
317 [40] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_23},
318 };
319
320 static const struct tegra_hte_data t194_aon_hte = {
321 .map_sz = ARRAY_SIZE(tegra194_aon_gpio_map),
322 .map = tegra194_aon_gpio_map,
323 .sec_map_sz = ARRAY_SIZE(tegra194_aon_gpio_sec_map),
324 .sec_map = tegra194_aon_gpio_sec_map,
325 .type = HTE_TEGRA_TYPE_GPIO,
326 .slices = 3,
327 };
328
329 static const struct tegra_hte_data t234_aon_hte = {
330 .map_sz = ARRAY_SIZE(tegra234_aon_gpio_map),
331 .map = tegra234_aon_gpio_map,
332 .sec_map_sz = ARRAY_SIZE(tegra234_aon_gpio_sec_map),
333 .sec_map = tegra234_aon_gpio_sec_map,
334 .type = HTE_TEGRA_TYPE_GPIO,
335 .slices = 3,
336 };
337
338 static const struct tegra_hte_data t194_lic_hte = {
339 .map_sz = 0,
340 .map = NULL,
341 .type = HTE_TEGRA_TYPE_LIC,
342 .slices = 11,
343 };
344
345 static const struct tegra_hte_data t234_lic_hte = {
346 .map_sz = 0,
347 .map = NULL,
348 .type = HTE_TEGRA_TYPE_LIC,
349 .slices = 17,
350 };
351
tegra_hte_readl(struct tegra_hte_soc * hte,u32 reg)352 static inline u32 tegra_hte_readl(struct tegra_hte_soc *hte, u32 reg)
353 {
354 return readl(hte->regs + reg);
355 }
356
tegra_hte_writel(struct tegra_hte_soc * hte,u32 reg,u32 val)357 static inline void tegra_hte_writel(struct tegra_hte_soc *hte, u32 reg,
358 u32 val)
359 {
360 writel(val, hte->regs + reg);
361 }
362
tegra_hte_map_to_line_id(u32 eid,const struct tegra_hte_line_mapped * m,u32 map_sz,u32 * mapped)363 static int tegra_hte_map_to_line_id(u32 eid,
364 const struct tegra_hte_line_mapped *m,
365 u32 map_sz, u32 *mapped)
366 {
367
368 if (m) {
369 if (eid >= map_sz)
370 return -EINVAL;
371 if (m[eid].slice == NV_AON_SLICE_INVALID)
372 return -EINVAL;
373
374 *mapped = (m[eid].slice << 5) + m[eid].bit_index;
375 } else {
376 *mapped = eid;
377 }
378
379 return 0;
380 }
381
tegra_hte_line_xlate(struct hte_chip * gc,const struct of_phandle_args * args,struct hte_ts_desc * desc,u32 * xlated_id)382 static int tegra_hte_line_xlate(struct hte_chip *gc,
383 const struct of_phandle_args *args,
384 struct hte_ts_desc *desc, u32 *xlated_id)
385 {
386 int ret = 0;
387 u32 line_id;
388 struct tegra_hte_soc *gs;
389 const struct tegra_hte_line_mapped *map = NULL;
390 u32 map_sz = 0;
391
392 if (!gc || !desc || !xlated_id)
393 return -EINVAL;
394
395 if (args) {
396 if (gc->of_hte_n_cells < 1)
397 return -EINVAL;
398
399 if (args->args_count != gc->of_hte_n_cells)
400 return -EINVAL;
401
402 desc->attr.line_id = args->args[0];
403 }
404
405 gs = gc->data;
406 if (!gs || !gs->prov_data)
407 return -EINVAL;
408
409 /*
410 * GPIO consumers can access GPIOs in two ways:
411 *
412 * 1) Using the global GPIO numberspace.
413 *
414 * This is the old, now DEPRECATED method and should not be used in
415 * new code. TODO: Check if tegra is even concerned by this.
416 *
417 * 2) Using GPIO descriptors that can be assigned to consumer devices
418 * using device-tree, ACPI or lookup tables.
419 *
420 * The code below addresses both the consumer use cases and maps into
421 * HTE/GTE namespace.
422 */
423 if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO && !args) {
424 line_id = desc->attr.line_id - gpio_device_get_base(gs->gdev);
425 map = gs->prov_data->map;
426 map_sz = gs->prov_data->map_sz;
427 } else if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO && args) {
428 line_id = desc->attr.line_id;
429 map = gs->prov_data->sec_map;
430 map_sz = gs->prov_data->sec_map_sz;
431 } else {
432 line_id = desc->attr.line_id;
433 }
434
435 ret = tegra_hte_map_to_line_id(line_id, map, map_sz, xlated_id);
436 if (ret < 0) {
437 dev_err(gc->dev, "line_id:%u mapping failed\n",
438 desc->attr.line_id);
439 return ret;
440 }
441
442 if (*xlated_id > gc->nlines)
443 return -EINVAL;
444
445 dev_dbg(gc->dev, "requested id:%u, xlated id:%u\n",
446 desc->attr.line_id, *xlated_id);
447
448 return 0;
449 }
450
tegra_hte_line_xlate_plat(struct hte_chip * gc,struct hte_ts_desc * desc,u32 * xlated_id)451 static int tegra_hte_line_xlate_plat(struct hte_chip *gc,
452 struct hte_ts_desc *desc, u32 *xlated_id)
453 {
454 return tegra_hte_line_xlate(gc, NULL, desc, xlated_id);
455 }
456
tegra_hte_en_dis_common(struct hte_chip * chip,u32 line_id,bool en)457 static int tegra_hte_en_dis_common(struct hte_chip *chip, u32 line_id, bool en)
458 {
459 u32 slice, sl_bit_shift, line_bit, val, reg;
460 struct tegra_hte_soc *gs;
461
462 sl_bit_shift = __builtin_ctz(HTE_SLICE_SIZE);
463
464 if (!chip)
465 return -EINVAL;
466
467 gs = chip->data;
468
469 if (line_id > chip->nlines) {
470 dev_err(chip->dev,
471 "line id: %u is not supported by this controller\n",
472 line_id);
473 return -EINVAL;
474 }
475
476 slice = line_id >> sl_bit_shift;
477 line_bit = line_id & (HTE_SLICE_SIZE - 1);
478 reg = (slice << sl_bit_shift) + HTE_SLICE0_TETEN;
479
480 spin_lock(&gs->sl[slice].s_lock);
481
482 if (test_bit(HTE_SUSPEND, &gs->sl[slice].flags)) {
483 spin_unlock(&gs->sl[slice].s_lock);
484 dev_dbg(chip->dev, "device suspended");
485 return -EBUSY;
486 }
487
488 val = tegra_hte_readl(gs, reg);
489 if (en)
490 val = val | (1 << line_bit);
491 else
492 val = val & (~(1 << line_bit));
493 tegra_hte_writel(gs, reg, val);
494
495 spin_unlock(&gs->sl[slice].s_lock);
496
497 dev_dbg(chip->dev, "line: %u, slice %u, line_bit %u, reg:0x%x\n",
498 line_id, slice, line_bit, reg);
499
500 return 0;
501 }
502
tegra_hte_enable(struct hte_chip * chip,u32 line_id)503 static int tegra_hte_enable(struct hte_chip *chip, u32 line_id)
504 {
505 if (!chip)
506 return -EINVAL;
507
508 return tegra_hte_en_dis_common(chip, line_id, true);
509 }
510
tegra_hte_disable(struct hte_chip * chip,u32 line_id)511 static int tegra_hte_disable(struct hte_chip *chip, u32 line_id)
512 {
513 if (!chip)
514 return -EINVAL;
515
516 return tegra_hte_en_dis_common(chip, line_id, false);
517 }
518
tegra_hte_request(struct hte_chip * chip,struct hte_ts_desc * desc,u32 line_id)519 static int tegra_hte_request(struct hte_chip *chip, struct hte_ts_desc *desc,
520 u32 line_id)
521 {
522 int ret;
523 struct tegra_hte_soc *gs;
524 struct hte_line_attr *attr;
525
526 if (!chip || !chip->data || !desc)
527 return -EINVAL;
528
529 gs = chip->data;
530 attr = &desc->attr;
531
532 if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
533 if (!attr->line_data)
534 return -EINVAL;
535
536 ret = gpiod_enable_hw_timestamp_ns(attr->line_data,
537 attr->edge_flags);
538 if (ret)
539 return ret;
540
541 gs->line_data[line_id].data = attr->line_data;
542 gs->line_data[line_id].flags = attr->edge_flags;
543 }
544
545 return tegra_hte_en_dis_common(chip, line_id, true);
546 }
547
tegra_hte_release(struct hte_chip * chip,struct hte_ts_desc * desc,u32 line_id)548 static int tegra_hte_release(struct hte_chip *chip, struct hte_ts_desc *desc,
549 u32 line_id)
550 {
551 struct tegra_hte_soc *gs;
552 struct hte_line_attr *attr;
553 int ret;
554
555 if (!chip || !chip->data || !desc)
556 return -EINVAL;
557
558 gs = chip->data;
559 attr = &desc->attr;
560
561 if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
562 ret = gpiod_disable_hw_timestamp_ns(attr->line_data,
563 gs->line_data[line_id].flags);
564 if (ret)
565 return ret;
566
567 gs->line_data[line_id].data = NULL;
568 gs->line_data[line_id].flags = 0;
569 }
570
571 return tegra_hte_en_dis_common(chip, line_id, false);
572 }
573
tegra_hte_clk_src_info(struct hte_chip * chip,struct hte_clk_info * ci)574 static int tegra_hte_clk_src_info(struct hte_chip *chip,
575 struct hte_clk_info *ci)
576 {
577 (void)chip;
578
579 if (!ci)
580 return -EINVAL;
581
582 ci->hz = HTE_TS_CLK_RATE_HZ;
583 ci->type = CLOCK_MONOTONIC;
584
585 return 0;
586 }
587
tegra_hte_get_level(struct tegra_hte_soc * gs,u32 line_id)588 static int tegra_hte_get_level(struct tegra_hte_soc *gs, u32 line_id)
589 {
590 struct gpio_desc *desc;
591
592 if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
593 desc = gs->line_data[line_id].data;
594 if (desc)
595 return gpiod_get_raw_value(desc);
596 }
597
598 return -1;
599 }
600
tegra_hte_read_fifo(struct tegra_hte_soc * gs)601 static void tegra_hte_read_fifo(struct tegra_hte_soc *gs)
602 {
603 u32 tsh, tsl, src, pv, cv, acv, slice, bit_index, line_id;
604 u64 tsc;
605 struct hte_ts_data el;
606
607 while ((tegra_hte_readl(gs, HTE_TESTATUS) >>
608 HTE_TESTATUS_OCCUPANCY_SHIFT) &
609 HTE_TESTATUS_OCCUPANCY_MASK) {
610 tsh = tegra_hte_readl(gs, HTE_TETSCH);
611 tsl = tegra_hte_readl(gs, HTE_TETSCL);
612 tsc = (((u64)tsh << 32) | tsl);
613
614 src = tegra_hte_readl(gs, HTE_TESRC);
615 slice = (src >> HTE_TESRC_SLICE_SHIFT) &
616 HTE_TESRC_SLICE_DEFAULT_MASK;
617
618 pv = tegra_hte_readl(gs, HTE_TEPCV);
619 cv = tegra_hte_readl(gs, HTE_TECCV);
620 acv = pv ^ cv;
621 while (acv) {
622 bit_index = __builtin_ctz(acv);
623 line_id = bit_index + (slice << 5);
624 el.tsc = tsc << HTE_TS_NS_SHIFT;
625 el.raw_level = tegra_hte_get_level(gs, line_id);
626 hte_push_ts_ns(gs->chip, line_id, &el);
627 acv &= ~BIT(bit_index);
628 }
629 tegra_hte_writel(gs, HTE_TECMD, HTE_TECMD_CMD_POP);
630 }
631 }
632
tegra_hte_isr(int irq,void * dev_id)633 static irqreturn_t tegra_hte_isr(int irq, void *dev_id)
634 {
635 struct tegra_hte_soc *gs = dev_id;
636 (void)irq;
637
638 tegra_hte_read_fifo(gs);
639
640 return IRQ_HANDLED;
641 }
642
tegra_hte_match_from_linedata(const struct hte_chip * chip,const struct hte_ts_desc * hdesc)643 static bool tegra_hte_match_from_linedata(const struct hte_chip *chip,
644 const struct hte_ts_desc *hdesc)
645 {
646 struct tegra_hte_soc *hte_dev = chip->data;
647
648 if (!hte_dev || (hte_dev->prov_data->type != HTE_TEGRA_TYPE_GPIO))
649 return false;
650
651 return hte_dev->gdev == gpiod_to_gpio_device(hdesc->attr.line_data);
652 }
653
654 static const struct of_device_id tegra_hte_of_match[] = {
655 { .compatible = "nvidia,tegra194-gte-lic", .data = &t194_lic_hte},
656 { .compatible = "nvidia,tegra194-gte-aon", .data = &t194_aon_hte},
657 { .compatible = "nvidia,tegra234-gte-lic", .data = &t234_lic_hte},
658 { .compatible = "nvidia,tegra234-gte-aon", .data = &t234_aon_hte},
659 { }
660 };
661 MODULE_DEVICE_TABLE(of, tegra_hte_of_match);
662
663 static const struct hte_ops g_ops = {
664 .request = tegra_hte_request,
665 .release = tegra_hte_release,
666 .enable = tegra_hte_enable,
667 .disable = tegra_hte_disable,
668 .get_clk_src_info = tegra_hte_clk_src_info,
669 };
670
tegra_gte_disable(void * data)671 static void tegra_gte_disable(void *data)
672 {
673 struct platform_device *pdev = data;
674 struct tegra_hte_soc *gs = dev_get_drvdata(&pdev->dev);
675
676 tegra_hte_writel(gs, HTE_TECTRL, 0);
677 }
678
tegra_hte_put_gpio_device(void * data)679 static void tegra_hte_put_gpio_device(void *data)
680 {
681 struct gpio_device *gdev = data;
682
683 gpio_device_put(gdev);
684 }
685
tegra_hte_probe(struct platform_device * pdev)686 static int tegra_hte_probe(struct platform_device *pdev)
687 {
688 int ret;
689 u32 i, slices, val = 0;
690 u32 nlines;
691 struct device *dev;
692 struct tegra_hte_soc *hte_dev;
693 struct hte_chip *gc;
694 struct device_node *gpio_ctrl;
695
696 dev = &pdev->dev;
697
698 hte_dev = devm_kzalloc(dev, sizeof(*hte_dev), GFP_KERNEL);
699 if (!hte_dev)
700 return -ENOMEM;
701
702 gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
703 if (!gc)
704 return -ENOMEM;
705
706 dev_set_drvdata(&pdev->dev, hte_dev);
707 hte_dev->prov_data = of_device_get_match_data(&pdev->dev);
708
709 ret = of_property_read_u32(dev->of_node, "nvidia,slices", &slices);
710 if (ret != 0)
711 slices = hte_dev->prov_data->slices;
712
713 dev_dbg(dev, "slices:%d\n", slices);
714 nlines = slices << 5;
715
716 hte_dev->regs = devm_platform_ioremap_resource(pdev, 0);
717 if (IS_ERR(hte_dev->regs))
718 return PTR_ERR(hte_dev->regs);
719
720 ret = of_property_read_u32(dev->of_node, "nvidia,int-threshold",
721 &hte_dev->itr_thrshld);
722 if (ret != 0)
723 hte_dev->itr_thrshld = 1;
724
725 hte_dev->sl = devm_kcalloc(dev, slices, sizeof(*hte_dev->sl),
726 GFP_KERNEL);
727 if (!hte_dev->sl)
728 return -ENOMEM;
729
730 ret = platform_get_irq(pdev, 0);
731 if (ret < 0)
732 return ret;
733 hte_dev->hte_irq = ret;
734 ret = devm_request_irq(dev, hte_dev->hte_irq, tegra_hte_isr, 0,
735 dev_name(dev), hte_dev);
736 if (ret < 0) {
737 dev_err(dev, "request irq failed.\n");
738 return ret;
739 }
740
741 gc->nlines = nlines;
742 gc->ops = &g_ops;
743 gc->dev = dev;
744 gc->data = hte_dev;
745 gc->xlate_of = tegra_hte_line_xlate;
746 gc->xlate_plat = tegra_hte_line_xlate_plat;
747 gc->of_hte_n_cells = 1;
748
749 if (hte_dev->prov_data &&
750 hte_dev->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
751 hte_dev->line_data = devm_kcalloc(dev, nlines,
752 sizeof(*hte_dev->line_data),
753 GFP_KERNEL);
754 if (!hte_dev->line_data)
755 return -ENOMEM;
756
757 gc->match_from_linedata = tegra_hte_match_from_linedata;
758
759 if (of_device_is_compatible(dev->of_node,
760 "nvidia,tegra194-gte-aon")) {
761 hte_dev->gdev =
762 gpio_device_find_by_label("tegra194-gpio-aon");
763 } else {
764 gpio_ctrl = of_parse_phandle(dev->of_node,
765 "nvidia,gpio-controller",
766 0);
767 if (!gpio_ctrl) {
768 dev_err(dev,
769 "gpio controller node not found\n");
770 return -ENODEV;
771 }
772
773 hte_dev->gdev =
774 gpio_device_find_by_fwnode(of_fwnode_handle(gpio_ctrl));
775 of_node_put(gpio_ctrl);
776 }
777
778 if (!hte_dev->gdev)
779 return dev_err_probe(dev, -EPROBE_DEFER,
780 "wait for gpio controller\n");
781
782 ret = devm_add_action_or_reset(dev, tegra_hte_put_gpio_device,
783 hte_dev->gdev);
784 if (ret)
785 return ret;
786 }
787
788 hte_dev->chip = gc;
789
790 ret = devm_hte_register_chip(hte_dev->chip);
791 if (ret) {
792 dev_err(gc->dev, "hte chip register failed");
793 return ret;
794 }
795
796 for (i = 0; i < slices; i++) {
797 hte_dev->sl[i].flags = 0;
798 spin_lock_init(&hte_dev->sl[i].s_lock);
799 }
800
801 val = HTE_TECTRL_ENABLE_ENABLE |
802 (HTE_TECTRL_INTR_ENABLE << HTE_TECTRL_INTR_SHIFT) |
803 (hte_dev->itr_thrshld << HTE_TECTRL_OCCU_SHIFT);
804 tegra_hte_writel(hte_dev, HTE_TECTRL, val);
805
806 ret = devm_add_action_or_reset(&pdev->dev, tegra_gte_disable, pdev);
807 if (ret)
808 return ret;
809
810 dev_dbg(gc->dev, "lines: %d, slices:%d", gc->nlines, slices);
811
812 return 0;
813 }
814
tegra_hte_resume_early(struct device * dev)815 static int tegra_hte_resume_early(struct device *dev)
816 {
817 u32 i;
818 struct tegra_hte_soc *gs = dev_get_drvdata(dev);
819 u32 slices = gs->chip->nlines / NV_LINES_IN_SLICE;
820 u32 sl_bit_shift = __builtin_ctz(HTE_SLICE_SIZE);
821
822 tegra_hte_writel(gs, HTE_TECTRL, gs->conf_rval);
823
824 for (i = 0; i < slices; i++) {
825 spin_lock(&gs->sl[i].s_lock);
826 tegra_hte_writel(gs,
827 ((i << sl_bit_shift) + HTE_SLICE0_TETEN),
828 gs->sl[i].r_val);
829 clear_bit(HTE_SUSPEND, &gs->sl[i].flags);
830 spin_unlock(&gs->sl[i].s_lock);
831 }
832
833 return 0;
834 }
835
tegra_hte_suspend_late(struct device * dev)836 static int tegra_hte_suspend_late(struct device *dev)
837 {
838 u32 i;
839 struct tegra_hte_soc *gs = dev_get_drvdata(dev);
840 u32 slices = gs->chip->nlines / NV_LINES_IN_SLICE;
841 u32 sl_bit_shift = __builtin_ctz(HTE_SLICE_SIZE);
842
843 gs->conf_rval = tegra_hte_readl(gs, HTE_TECTRL);
844 for (i = 0; i < slices; i++) {
845 spin_lock(&gs->sl[i].s_lock);
846 gs->sl[i].r_val = tegra_hte_readl(gs,
847 ((i << sl_bit_shift) + HTE_SLICE0_TETEN));
848 set_bit(HTE_SUSPEND, &gs->sl[i].flags);
849 spin_unlock(&gs->sl[i].s_lock);
850 }
851
852 return 0;
853 }
854
855 static const struct dev_pm_ops tegra_hte_pm = {
856 LATE_SYSTEM_SLEEP_PM_OPS(tegra_hte_suspend_late, tegra_hte_resume_early)
857 };
858
859 static struct platform_driver tegra_hte_driver = {
860 .probe = tegra_hte_probe,
861 .driver = {
862 .name = "tegra_hte",
863 .pm = pm_sleep_ptr(&tegra_hte_pm),
864 .of_match_table = tegra_hte_of_match,
865 },
866 };
867
868 module_platform_driver(tegra_hte_driver);
869
870 MODULE_AUTHOR("Dipen Patel <dipenp@nvidia.com>");
871 MODULE_DESCRIPTION("NVIDIA Tegra HTE (Hardware Timestamping Engine) driver");
872 MODULE_LICENSE("GPL");
873