1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
4 *
5 */
6
7 #include <linux/bitmap.h>
8 #include <linux/bitops.h>
9 #include <linux/device.h>
10 #include <linux/io.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14 #include <linux/of.h>
15 #include <linux/of_device.h>
16 #include <linux/regmap.h>
17 #include <linux/sizes.h>
18 #include <linux/slab.h>
19 #include <linux/soc/qcom/llcc-qcom.h>
20
21 #define ACTIVATE BIT(0)
22 #define DEACTIVATE BIT(1)
23 #define ACT_CTRL_OPCODE_ACTIVATE BIT(0)
24 #define ACT_CTRL_OPCODE_DEACTIVATE BIT(1)
25 #define ACT_CTRL_ACT_TRIG BIT(0)
26 #define ACT_CTRL_OPCODE_SHIFT 0x01
27 #define ATTR1_PROBE_TARGET_WAYS_SHIFT 0x02
28 #define ATTR1_FIXED_SIZE_SHIFT 0x03
29 #define ATTR1_PRIORITY_SHIFT 0x04
30 #define ATTR1_MAX_CAP_SHIFT 0x10
31 #define ATTR0_RES_WAYS_MASK GENMASK(11, 0)
32 #define ATTR0_BONUS_WAYS_MASK GENMASK(27, 16)
33 #define ATTR0_BONUS_WAYS_SHIFT 0x10
34 #define LLCC_STATUS_READ_DELAY 100
35
36 #define CACHE_LINE_SIZE_SHIFT 6
37
38 #define LLCC_COMMON_STATUS0 0x0003000c
39 #define LLCC_LB_CNT_MASK GENMASK(31, 28)
40 #define LLCC_LB_CNT_SHIFT 28
41
42 #define MAX_CAP_TO_BYTES(n) (n * SZ_1K)
43 #define LLCC_TRP_ACT_CTRLn(n) (n * SZ_4K)
44 #define LLCC_TRP_STATUSn(n) (4 + n * SZ_4K)
45 #define LLCC_TRP_ATTR0_CFGn(n) (0x21000 + SZ_8 * n)
46 #define LLCC_TRP_ATTR1_CFGn(n) (0x21004 + SZ_8 * n)
47
48 #define BANK_OFFSET_STRIDE 0x80000
49
50 /**
51 * llcc_slice_config - Data associated with the llcc slice
52 * @usecase_id: Unique id for the client's use case
53 * @slice_id: llcc slice id for each client
54 * @max_cap: The maximum capacity of the cache slice provided in KB
55 * @priority: Priority of the client used to select victim line for replacement
56 * @fixed_size: Boolean indicating if the slice has a fixed capacity
57 * @bonus_ways: Bonus ways are additional ways to be used for any slice,
58 * if client ends up using more than reserved cache ways. Bonus
59 * ways are allocated only if they are not reserved for some
60 * other client.
61 * @res_ways: Reserved ways for the cache slice, the reserved ways cannot
62 * be used by any other client than the one its assigned to.
63 * @cache_mode: Each slice operates as a cache, this controls the mode of the
64 * slice: normal or TCM(Tightly Coupled Memory)
65 * @probe_target_ways: Determines what ways to probe for access hit. When
66 * configured to 1 only bonus and reserved ways are probed.
67 * When configured to 0 all ways in llcc are probed.
68 * @dis_cap_alloc: Disable capacity based allocation for a client
69 * @retain_on_pc: If this bit is set and client has maintained active vote
70 * then the ways assigned to this client are not flushed on power
71 * collapse.
72 * @activate_on_init: Activate the slice immediately after it is programmed
73 */
74 struct llcc_slice_config {
75 u32 usecase_id;
76 u32 slice_id;
77 u32 max_cap;
78 u32 priority;
79 bool fixed_size;
80 u32 bonus_ways;
81 u32 res_ways;
82 u32 cache_mode;
83 u32 probe_target_ways;
84 bool dis_cap_alloc;
85 bool retain_on_pc;
86 bool activate_on_init;
87 };
88
89 struct qcom_llcc_config {
90 const struct llcc_slice_config *sct_data;
91 int size;
92 };
93
94 static const struct llcc_slice_config sc7180_data[] = {
95 { LLCC_CPUSS, 1, 256, 1, 0, 0xf, 0x0, 0, 0, 0, 1, 1 },
96 { LLCC_MDM, 8, 128, 1, 0, 0xf, 0x0, 0, 0, 0, 1, 0 },
97 { LLCC_GPUHTW, 11, 128, 1, 0, 0xf, 0x0, 0, 0, 0, 1, 0 },
98 { LLCC_GPU, 12, 128, 1, 0, 0xf, 0x0, 0, 0, 0, 1, 0 },
99 };
100
101 static const struct llcc_slice_config sdm845_data[] = {
102 { LLCC_CPUSS, 1, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 1 },
103 { LLCC_VIDSC0, 2, 512, 2, 1, 0x0, 0x0f0, 0, 0, 1, 1, 0 },
104 { LLCC_VIDSC1, 3, 512, 2, 1, 0x0, 0x0f0, 0, 0, 1, 1, 0 },
105 { LLCC_ROTATOR, 4, 563, 2, 1, 0x0, 0x00e, 2, 0, 1, 1, 0 },
106 { LLCC_VOICE, 5, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0 },
107 { LLCC_AUDIO, 6, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0 },
108 { LLCC_MDMHPGRW, 7, 1024, 2, 0, 0xfc, 0xf00, 0, 0, 1, 1, 0 },
109 { LLCC_MDM, 8, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0 },
110 { LLCC_CMPT, 10, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0 },
111 { LLCC_GPUHTW, 11, 512, 1, 1, 0xc, 0x0, 0, 0, 1, 1, 0 },
112 { LLCC_GPU, 12, 2304, 1, 0, 0xff0, 0x2, 0, 0, 1, 1, 0 },
113 { LLCC_MMUHWT, 13, 256, 2, 0, 0x0, 0x1, 0, 0, 1, 0, 1 },
114 { LLCC_CMPTDMA, 15, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0 },
115 { LLCC_DISP, 16, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0 },
116 { LLCC_VIDFW, 17, 2816, 1, 0, 0xffc, 0x2, 0, 0, 1, 1, 0 },
117 { LLCC_MDMHPFX, 20, 1024, 2, 1, 0x0, 0xf00, 0, 0, 1, 1, 0 },
118 { LLCC_MDMPNG, 21, 1024, 0, 1, 0x1e, 0x0, 0, 0, 1, 1, 0 },
119 { LLCC_AUDHW, 22, 1024, 1, 1, 0xffc, 0x2, 0, 0, 1, 1, 0 },
120 };
121
122 static const struct qcom_llcc_config sc7180_cfg = {
123 .sct_data = sc7180_data,
124 .size = ARRAY_SIZE(sc7180_data),
125 };
126
127 static const struct qcom_llcc_config sdm845_cfg = {
128 .sct_data = sdm845_data,
129 .size = ARRAY_SIZE(sdm845_data),
130 };
131
132 static struct llcc_drv_data *drv_data = (void *) -EPROBE_DEFER;
133
134 /**
135 * llcc_slice_getd - get llcc slice descriptor
136 * @uid: usecase_id for the client
137 *
138 * A pointer to llcc slice descriptor will be returned on success and
139 * and error pointer is returned on failure
140 */
llcc_slice_getd(u32 uid)141 struct llcc_slice_desc *llcc_slice_getd(u32 uid)
142 {
143 const struct llcc_slice_config *cfg;
144 struct llcc_slice_desc *desc;
145 u32 sz, count;
146
147 if (IS_ERR(drv_data))
148 return ERR_CAST(drv_data);
149
150 cfg = drv_data->cfg;
151 sz = drv_data->cfg_size;
152
153 for (count = 0; cfg && count < sz; count++, cfg++)
154 if (cfg->usecase_id == uid)
155 break;
156
157 if (count == sz || !cfg)
158 return ERR_PTR(-ENODEV);
159
160 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
161 if (!desc)
162 return ERR_PTR(-ENOMEM);
163
164 desc->slice_id = cfg->slice_id;
165 desc->slice_size = cfg->max_cap;
166
167 return desc;
168 }
169 EXPORT_SYMBOL_GPL(llcc_slice_getd);
170
171 /**
172 * llcc_slice_putd - llcc slice descritpor
173 * @desc: Pointer to llcc slice descriptor
174 */
llcc_slice_putd(struct llcc_slice_desc * desc)175 void llcc_slice_putd(struct llcc_slice_desc *desc)
176 {
177 if (!IS_ERR_OR_NULL(desc))
178 kfree(desc);
179 }
180 EXPORT_SYMBOL_GPL(llcc_slice_putd);
181
llcc_update_act_ctrl(u32 sid,u32 act_ctrl_reg_val,u32 status)182 static int llcc_update_act_ctrl(u32 sid,
183 u32 act_ctrl_reg_val, u32 status)
184 {
185 u32 act_ctrl_reg;
186 u32 status_reg;
187 u32 slice_status;
188 int ret;
189
190 if (IS_ERR(drv_data))
191 return PTR_ERR(drv_data);
192
193 act_ctrl_reg = LLCC_TRP_ACT_CTRLn(sid);
194 status_reg = LLCC_TRP_STATUSn(sid);
195
196 /* Set the ACTIVE trigger */
197 act_ctrl_reg_val |= ACT_CTRL_ACT_TRIG;
198 ret = regmap_write(drv_data->bcast_regmap, act_ctrl_reg,
199 act_ctrl_reg_val);
200 if (ret)
201 return ret;
202
203 /* Clear the ACTIVE trigger */
204 act_ctrl_reg_val &= ~ACT_CTRL_ACT_TRIG;
205 ret = regmap_write(drv_data->bcast_regmap, act_ctrl_reg,
206 act_ctrl_reg_val);
207 if (ret)
208 return ret;
209
210 ret = regmap_read_poll_timeout(drv_data->bcast_regmap, status_reg,
211 slice_status, !(slice_status & status),
212 0, LLCC_STATUS_READ_DELAY);
213 return ret;
214 }
215
216 /**
217 * llcc_slice_activate - Activate the llcc slice
218 * @desc: Pointer to llcc slice descriptor
219 *
220 * A value of zero will be returned on success and a negative errno will
221 * be returned in error cases
222 */
llcc_slice_activate(struct llcc_slice_desc * desc)223 int llcc_slice_activate(struct llcc_slice_desc *desc)
224 {
225 int ret;
226 u32 act_ctrl_val;
227
228 if (IS_ERR(drv_data))
229 return PTR_ERR(drv_data);
230
231 if (IS_ERR_OR_NULL(desc))
232 return -EINVAL;
233
234 mutex_lock(&drv_data->lock);
235 if (test_bit(desc->slice_id, drv_data->bitmap)) {
236 mutex_unlock(&drv_data->lock);
237 return 0;
238 }
239
240 act_ctrl_val = ACT_CTRL_OPCODE_ACTIVATE << ACT_CTRL_OPCODE_SHIFT;
241
242 ret = llcc_update_act_ctrl(desc->slice_id, act_ctrl_val,
243 DEACTIVATE);
244 if (ret) {
245 mutex_unlock(&drv_data->lock);
246 return ret;
247 }
248
249 __set_bit(desc->slice_id, drv_data->bitmap);
250 mutex_unlock(&drv_data->lock);
251
252 return ret;
253 }
254 EXPORT_SYMBOL_GPL(llcc_slice_activate);
255
256 /**
257 * llcc_slice_deactivate - Deactivate the llcc slice
258 * @desc: Pointer to llcc slice descriptor
259 *
260 * A value of zero will be returned on success and a negative errno will
261 * be returned in error cases
262 */
llcc_slice_deactivate(struct llcc_slice_desc * desc)263 int llcc_slice_deactivate(struct llcc_slice_desc *desc)
264 {
265 u32 act_ctrl_val;
266 int ret;
267
268 if (IS_ERR(drv_data))
269 return PTR_ERR(drv_data);
270
271 if (IS_ERR_OR_NULL(desc))
272 return -EINVAL;
273
274 mutex_lock(&drv_data->lock);
275 if (!test_bit(desc->slice_id, drv_data->bitmap)) {
276 mutex_unlock(&drv_data->lock);
277 return 0;
278 }
279 act_ctrl_val = ACT_CTRL_OPCODE_DEACTIVATE << ACT_CTRL_OPCODE_SHIFT;
280
281 ret = llcc_update_act_ctrl(desc->slice_id, act_ctrl_val,
282 ACTIVATE);
283 if (ret) {
284 mutex_unlock(&drv_data->lock);
285 return ret;
286 }
287
288 __clear_bit(desc->slice_id, drv_data->bitmap);
289 mutex_unlock(&drv_data->lock);
290
291 return ret;
292 }
293 EXPORT_SYMBOL_GPL(llcc_slice_deactivate);
294
295 /**
296 * llcc_get_slice_id - return the slice id
297 * @desc: Pointer to llcc slice descriptor
298 */
llcc_get_slice_id(struct llcc_slice_desc * desc)299 int llcc_get_slice_id(struct llcc_slice_desc *desc)
300 {
301 if (IS_ERR_OR_NULL(desc))
302 return -EINVAL;
303
304 return desc->slice_id;
305 }
306 EXPORT_SYMBOL_GPL(llcc_get_slice_id);
307
308 /**
309 * llcc_get_slice_size - return the slice id
310 * @desc: Pointer to llcc slice descriptor
311 */
llcc_get_slice_size(struct llcc_slice_desc * desc)312 size_t llcc_get_slice_size(struct llcc_slice_desc *desc)
313 {
314 if (IS_ERR_OR_NULL(desc))
315 return 0;
316
317 return desc->slice_size;
318 }
319 EXPORT_SYMBOL_GPL(llcc_get_slice_size);
320
qcom_llcc_cfg_program(struct platform_device * pdev)321 static int qcom_llcc_cfg_program(struct platform_device *pdev)
322 {
323 int i;
324 u32 attr1_cfg;
325 u32 attr0_cfg;
326 u32 attr1_val;
327 u32 attr0_val;
328 u32 max_cap_cacheline;
329 u32 sz;
330 int ret = 0;
331 const struct llcc_slice_config *llcc_table;
332 struct llcc_slice_desc desc;
333
334 sz = drv_data->cfg_size;
335 llcc_table = drv_data->cfg;
336
337 for (i = 0; i < sz; i++) {
338 attr1_cfg = LLCC_TRP_ATTR1_CFGn(llcc_table[i].slice_id);
339 attr0_cfg = LLCC_TRP_ATTR0_CFGn(llcc_table[i].slice_id);
340
341 attr1_val = llcc_table[i].cache_mode;
342 attr1_val |= llcc_table[i].probe_target_ways <<
343 ATTR1_PROBE_TARGET_WAYS_SHIFT;
344 attr1_val |= llcc_table[i].fixed_size <<
345 ATTR1_FIXED_SIZE_SHIFT;
346 attr1_val |= llcc_table[i].priority <<
347 ATTR1_PRIORITY_SHIFT;
348
349 max_cap_cacheline = MAX_CAP_TO_BYTES(llcc_table[i].max_cap);
350
351 /* LLCC instances can vary for each target.
352 * The SW writes to broadcast register which gets propagated
353 * to each llcc instace (llcc0,.. llccN).
354 * Since the size of the memory is divided equally amongst the
355 * llcc instances, we need to configure the max cap accordingly.
356 */
357 max_cap_cacheline = max_cap_cacheline / drv_data->num_banks;
358 max_cap_cacheline >>= CACHE_LINE_SIZE_SHIFT;
359 attr1_val |= max_cap_cacheline << ATTR1_MAX_CAP_SHIFT;
360
361 attr0_val = llcc_table[i].res_ways & ATTR0_RES_WAYS_MASK;
362 attr0_val |= llcc_table[i].bonus_ways << ATTR0_BONUS_WAYS_SHIFT;
363
364 ret = regmap_write(drv_data->bcast_regmap, attr1_cfg,
365 attr1_val);
366 if (ret)
367 return ret;
368 ret = regmap_write(drv_data->bcast_regmap, attr0_cfg,
369 attr0_val);
370 if (ret)
371 return ret;
372 if (llcc_table[i].activate_on_init) {
373 desc.slice_id = llcc_table[i].slice_id;
374 ret = llcc_slice_activate(&desc);
375 }
376 }
377 return ret;
378 }
379
qcom_llcc_remove(struct platform_device * pdev)380 static int qcom_llcc_remove(struct platform_device *pdev)
381 {
382 /* Set the global pointer to a error code to avoid referencing it */
383 drv_data = ERR_PTR(-ENODEV);
384 return 0;
385 }
386
qcom_llcc_init_mmio(struct platform_device * pdev,const char * name)387 static struct regmap *qcom_llcc_init_mmio(struct platform_device *pdev,
388 const char *name)
389 {
390 void __iomem *base;
391 struct regmap_config llcc_regmap_config = {
392 .reg_bits = 32,
393 .reg_stride = 4,
394 .val_bits = 32,
395 .fast_io = true,
396 };
397
398 base = devm_platform_ioremap_resource_byname(pdev, name);
399 if (IS_ERR(base))
400 return ERR_CAST(base);
401
402 llcc_regmap_config.name = name;
403 return devm_regmap_init_mmio(&pdev->dev, base, &llcc_regmap_config);
404 }
405
qcom_llcc_probe(struct platform_device * pdev)406 static int qcom_llcc_probe(struct platform_device *pdev)
407 {
408 u32 num_banks;
409 struct device *dev = &pdev->dev;
410 int ret, i;
411 struct platform_device *llcc_edac;
412 const struct qcom_llcc_config *cfg;
413 const struct llcc_slice_config *llcc_cfg;
414 u32 sz;
415
416 drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
417 if (!drv_data) {
418 ret = -ENOMEM;
419 goto err;
420 }
421
422 drv_data->regmap = qcom_llcc_init_mmio(pdev, "llcc_base");
423 if (IS_ERR(drv_data->regmap)) {
424 ret = PTR_ERR(drv_data->regmap);
425 goto err;
426 }
427
428 drv_data->bcast_regmap =
429 qcom_llcc_init_mmio(pdev, "llcc_broadcast_base");
430 if (IS_ERR(drv_data->bcast_regmap)) {
431 ret = PTR_ERR(drv_data->bcast_regmap);
432 goto err;
433 }
434
435 ret = regmap_read(drv_data->regmap, LLCC_COMMON_STATUS0,
436 &num_banks);
437 if (ret)
438 goto err;
439
440 num_banks &= LLCC_LB_CNT_MASK;
441 num_banks >>= LLCC_LB_CNT_SHIFT;
442 drv_data->num_banks = num_banks;
443
444 cfg = of_device_get_match_data(&pdev->dev);
445 llcc_cfg = cfg->sct_data;
446 sz = cfg->size;
447
448 for (i = 0; i < sz; i++)
449 if (llcc_cfg[i].slice_id > drv_data->max_slices)
450 drv_data->max_slices = llcc_cfg[i].slice_id;
451
452 drv_data->offsets = devm_kcalloc(dev, num_banks, sizeof(u32),
453 GFP_KERNEL);
454 if (!drv_data->offsets) {
455 ret = -ENOMEM;
456 goto err;
457 }
458
459 for (i = 0; i < num_banks; i++)
460 drv_data->offsets[i] = i * BANK_OFFSET_STRIDE;
461
462 drv_data->bitmap = devm_kcalloc(dev,
463 BITS_TO_LONGS(drv_data->max_slices), sizeof(unsigned long),
464 GFP_KERNEL);
465 if (!drv_data->bitmap) {
466 ret = -ENOMEM;
467 goto err;
468 }
469
470 drv_data->cfg = llcc_cfg;
471 drv_data->cfg_size = sz;
472 mutex_init(&drv_data->lock);
473 platform_set_drvdata(pdev, drv_data);
474
475 ret = qcom_llcc_cfg_program(pdev);
476 if (ret)
477 goto err;
478
479 drv_data->ecc_irq = platform_get_irq_optional(pdev, 0);
480 if (drv_data->ecc_irq >= 0) {
481 llcc_edac = platform_device_register_data(&pdev->dev,
482 "qcom_llcc_edac", -1, drv_data,
483 sizeof(*drv_data));
484 if (IS_ERR(llcc_edac))
485 dev_err(dev, "Failed to register llcc edac driver\n");
486 }
487
488 return 0;
489 err:
490 drv_data = ERR_PTR(-ENODEV);
491 return ret;
492 }
493
494 static const struct of_device_id qcom_llcc_of_match[] = {
495 { .compatible = "qcom,sc7180-llcc", .data = &sc7180_cfg },
496 { .compatible = "qcom,sdm845-llcc", .data = &sdm845_cfg },
497 { }
498 };
499 MODULE_DEVICE_TABLE(of, qcom_llcc_of_match);
500
501 static struct platform_driver qcom_llcc_driver = {
502 .driver = {
503 .name = "qcom-llcc",
504 .of_match_table = qcom_llcc_of_match,
505 },
506 .probe = qcom_llcc_probe,
507 .remove = qcom_llcc_remove,
508 };
509 module_platform_driver(qcom_llcc_driver);
510
511 MODULE_DESCRIPTION("Qualcomm Last Level Cache Controller");
512 MODULE_LICENSE("GPL v2");
513