tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2017-2018, 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_device.h>
15#include <linux/regmap.h>
16#include <linux/slab.h>
17#include <linux/soc/qcom/llcc-qcom.h>
18
19#define ACTIVATE BIT(0)
20#define DEACTIVATE BIT(1)
21#define ACT_CTRL_OPCODE_ACTIVATE BIT(0)
22#define ACT_CTRL_OPCODE_DEACTIVATE BIT(1)
23#define ACT_CTRL_ACT_TRIG BIT(0)
24#define ACT_CTRL_OPCODE_SHIFT 0x01
25#define ATTR1_PROBE_TARGET_WAYS_SHIFT 0x02
26#define ATTR1_FIXED_SIZE_SHIFT 0x03
27#define ATTR1_PRIORITY_SHIFT 0x04
28#define ATTR1_MAX_CAP_SHIFT 0x10
29#define ATTR0_RES_WAYS_MASK GENMASK(11, 0)
30#define ATTR0_BONUS_WAYS_MASK GENMASK(27, 16)
31#define ATTR0_BONUS_WAYS_SHIFT 0x10
32#define LLCC_STATUS_READ_DELAY 100
33
34#define CACHE_LINE_SIZE_SHIFT 6
35
36#define LLCC_COMMON_STATUS0 0x0003000c
37#define LLCC_LB_CNT_MASK GENMASK(31, 28)
38#define LLCC_LB_CNT_SHIFT 28
39
40#define MAX_CAP_TO_BYTES(n) (n * SZ_1K)
41#define LLCC_TRP_ACT_CTRLn(n) (n * SZ_4K)
42#define LLCC_TRP_STATUSn(n) (4 + n * SZ_4K)
43#define LLCC_TRP_ATTR0_CFGn(n) (0x21000 + SZ_8 * n)
44#define LLCC_TRP_ATTR1_CFGn(n) (0x21004 + SZ_8 * n)
45
46#define BANK_OFFSET_STRIDE 0x80000
47
48static struct llcc_drv_data *drv_data;
49
50static const struct regmap_config llcc_regmap_config = {
51 .reg_bits = 32,
52 .reg_stride = 4,
53 .val_bits = 32,
54 .fast_io = true,
55};
56
57/**
58 * llcc_slice_getd - get llcc slice descriptor
59 * @uid: usecase_id for the client
60 *
61 * A pointer to llcc slice descriptor will be returned on success and
62 * and error pointer is returned on failure
63 */
64struct llcc_slice_desc *llcc_slice_getd(u32 uid)
65{
66 const struct llcc_slice_config *cfg;
67 struct llcc_slice_desc *desc;
68 u32 sz, count;
69
70 cfg = drv_data->cfg;
71 sz = drv_data->cfg_size;
72
73 for (count = 0; cfg && count < sz; count++, cfg++)
74 if (cfg->usecase_id == uid)
75 break;
76
77 if (count == sz || !cfg)
78 return ERR_PTR(-ENODEV);
79
80 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
81 if (!desc)
82 return ERR_PTR(-ENOMEM);
83
84 desc->slice_id = cfg->slice_id;
85 desc->slice_size = cfg->max_cap;
86
87 return desc;
88}
89EXPORT_SYMBOL_GPL(llcc_slice_getd);
90
91/**
92 * llcc_slice_putd - llcc slice descritpor
93 * @desc: Pointer to llcc slice descriptor
94 */
95void llcc_slice_putd(struct llcc_slice_desc *desc)
96{
97 kfree(desc);
98}
99EXPORT_SYMBOL_GPL(llcc_slice_putd);
100
101static int llcc_update_act_ctrl(u32 sid,
102 u32 act_ctrl_reg_val, u32 status)
103{
104 u32 act_ctrl_reg;
105 u32 status_reg;
106 u32 slice_status;
107 int ret;
108
109 act_ctrl_reg = drv_data->bcast_off + LLCC_TRP_ACT_CTRLn(sid);
110 status_reg = drv_data->bcast_off + LLCC_TRP_STATUSn(sid);
111
112 /* Set the ACTIVE trigger */
113 act_ctrl_reg_val |= ACT_CTRL_ACT_TRIG;
114 ret = regmap_write(drv_data->regmap, act_ctrl_reg, act_ctrl_reg_val);
115 if (ret)
116 return ret;
117
118 /* Clear the ACTIVE trigger */
119 act_ctrl_reg_val &= ~ACT_CTRL_ACT_TRIG;
120 ret = regmap_write(drv_data->regmap, act_ctrl_reg, act_ctrl_reg_val);
121 if (ret)
122 return ret;
123
124 ret = regmap_read_poll_timeout(drv_data->regmap, status_reg,
125 slice_status, !(slice_status & status),
126 0, LLCC_STATUS_READ_DELAY);
127 return ret;
128}
129
130/**
131 * llcc_slice_activate - Activate the llcc slice
132 * @desc: Pointer to llcc slice descriptor
133 *
134 * A value of zero will be returned on success and a negative errno will
135 * be returned in error cases
136 */
137int llcc_slice_activate(struct llcc_slice_desc *desc)
138{
139 int ret;
140 u32 act_ctrl_val;
141
142 mutex_lock(&drv_data->lock);
143 if (test_bit(desc->slice_id, drv_data->bitmap)) {
144 mutex_unlock(&drv_data->lock);
145 return 0;
146 }
147
148 act_ctrl_val = ACT_CTRL_OPCODE_ACTIVATE << ACT_CTRL_OPCODE_SHIFT;
149
150 ret = llcc_update_act_ctrl(desc->slice_id, act_ctrl_val,
151 DEACTIVATE);
152 if (ret) {
153 mutex_unlock(&drv_data->lock);
154 return ret;
155 }
156
157 __set_bit(desc->slice_id, drv_data->bitmap);
158 mutex_unlock(&drv_data->lock);
159
160 return ret;
161}
162EXPORT_SYMBOL_GPL(llcc_slice_activate);
163
164/**
165 * llcc_slice_deactivate - Deactivate the llcc slice
166 * @desc: Pointer to llcc slice descriptor
167 *
168 * A value of zero will be returned on success and a negative errno will
169 * be returned in error cases
170 */
171int llcc_slice_deactivate(struct llcc_slice_desc *desc)
172{
173 u32 act_ctrl_val;
174 int ret;
175
176 mutex_lock(&drv_data->lock);
177 if (!test_bit(desc->slice_id, drv_data->bitmap)) {
178 mutex_unlock(&drv_data->lock);
179 return 0;
180 }
181 act_ctrl_val = ACT_CTRL_OPCODE_DEACTIVATE << ACT_CTRL_OPCODE_SHIFT;
182
183 ret = llcc_update_act_ctrl(desc->slice_id, act_ctrl_val,
184 ACTIVATE);
185 if (ret) {
186 mutex_unlock(&drv_data->lock);
187 return ret;
188 }
189
190 __clear_bit(desc->slice_id, drv_data->bitmap);
191 mutex_unlock(&drv_data->lock);
192
193 return ret;
194}
195EXPORT_SYMBOL_GPL(llcc_slice_deactivate);
196
197/**
198 * llcc_get_slice_id - return the slice id
199 * @desc: Pointer to llcc slice descriptor
200 */
201int llcc_get_slice_id(struct llcc_slice_desc *desc)
202{
203 return desc->slice_id;
204}
205EXPORT_SYMBOL_GPL(llcc_get_slice_id);
206
207/**
208 * llcc_get_slice_size - return the slice id
209 * @desc: Pointer to llcc slice descriptor
210 */
211size_t llcc_get_slice_size(struct llcc_slice_desc *desc)
212{
213 return desc->slice_size;
214}
215EXPORT_SYMBOL_GPL(llcc_get_slice_size);
216
217static int qcom_llcc_cfg_program(struct platform_device *pdev)
218{
219 int i;
220 u32 attr1_cfg;
221 u32 attr0_cfg;
222 u32 attr1_val;
223 u32 attr0_val;
224 u32 max_cap_cacheline;
225 u32 sz;
226 int ret;
227 const struct llcc_slice_config *llcc_table;
228 struct llcc_slice_desc desc;
229 u32 bcast_off = drv_data->bcast_off;
230
231 sz = drv_data->cfg_size;
232 llcc_table = drv_data->cfg;
233
234 for (i = 0; i < sz; i++) {
235 attr1_cfg = bcast_off +
236 LLCC_TRP_ATTR1_CFGn(llcc_table[i].slice_id);
237 attr0_cfg = bcast_off +
238 LLCC_TRP_ATTR0_CFGn(llcc_table[i].slice_id);
239
240 attr1_val = llcc_table[i].cache_mode;
241 attr1_val |= llcc_table[i].probe_target_ways <<
242 ATTR1_PROBE_TARGET_WAYS_SHIFT;
243 attr1_val |= llcc_table[i].fixed_size <<
244 ATTR1_FIXED_SIZE_SHIFT;
245 attr1_val |= llcc_table[i].priority <<
246 ATTR1_PRIORITY_SHIFT;
247
248 max_cap_cacheline = MAX_CAP_TO_BYTES(llcc_table[i].max_cap);
249
250 /* LLCC instances can vary for each target.
251 * The SW writes to broadcast register which gets propagated
252 * to each llcc instace (llcc0,.. llccN).
253 * Since the size of the memory is divided equally amongst the
254 * llcc instances, we need to configure the max cap accordingly.
255 */
256 max_cap_cacheline = max_cap_cacheline / drv_data->num_banks;
257 max_cap_cacheline >>= CACHE_LINE_SIZE_SHIFT;
258 attr1_val |= max_cap_cacheline << ATTR1_MAX_CAP_SHIFT;
259
260 attr0_val = llcc_table[i].res_ways & ATTR0_RES_WAYS_MASK;
261 attr0_val |= llcc_table[i].bonus_ways << ATTR0_BONUS_WAYS_SHIFT;
262
263 ret = regmap_write(drv_data->regmap, attr1_cfg, attr1_val);
264 if (ret)
265 return ret;
266 ret = regmap_write(drv_data->regmap, attr0_cfg, attr0_val);
267 if (ret)
268 return ret;
269 if (llcc_table[i].activate_on_init) {
270 desc.slice_id = llcc_table[i].slice_id;
271 ret = llcc_slice_activate(&desc);
272 }
273 }
274 return ret;
275}
276
277int qcom_llcc_probe(struct platform_device *pdev,
278 const struct llcc_slice_config *llcc_cfg, u32 sz)
279{
280 u32 num_banks;
281 struct device *dev = &pdev->dev;
282 struct resource *res;
283 void __iomem *base;
284 int ret, i;
285
286 drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
287 if (!drv_data)
288 return -ENOMEM;
289
290 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
291 base = devm_ioremap_resource(&pdev->dev, res);
292 if (IS_ERR(base))
293 return PTR_ERR(base);
294
295 drv_data->regmap = devm_regmap_init_mmio(dev, base,
296 &llcc_regmap_config);
297 if (IS_ERR(drv_data->regmap))
298 return PTR_ERR(drv_data->regmap);
299
300 ret = regmap_read(drv_data->regmap, LLCC_COMMON_STATUS0,
301 &num_banks);
302 if (ret)
303 return ret;
304
305 num_banks &= LLCC_LB_CNT_MASK;
306 num_banks >>= LLCC_LB_CNT_SHIFT;
307 drv_data->num_banks = num_banks;
308
309 for (i = 0; i < sz; i++)
310 if (llcc_cfg[i].slice_id > drv_data->max_slices)
311 drv_data->max_slices = llcc_cfg[i].slice_id;
312
313 drv_data->offsets = devm_kcalloc(dev, num_banks, sizeof(u32),
314 GFP_KERNEL);
315 if (!drv_data->offsets)
316 return -ENOMEM;
317
318 for (i = 0; i < num_banks; i++)
319 drv_data->offsets[i] = i * BANK_OFFSET_STRIDE;
320
321 drv_data->bcast_off = num_banks * BANK_OFFSET_STRIDE;
322
323 drv_data->bitmap = devm_kcalloc(dev,
324 BITS_TO_LONGS(drv_data->max_slices), sizeof(unsigned long),
325 GFP_KERNEL);
326 if (!drv_data->bitmap)
327 return -ENOMEM;
328
329 drv_data->cfg = llcc_cfg;
330 drv_data->cfg_size = sz;
331 mutex_init(&drv_data->lock);
332 platform_set_drvdata(pdev, drv_data);
333
334 return qcom_llcc_cfg_program(pdev);
335}
336EXPORT_SYMBOL_GPL(qcom_llcc_probe);
337
338MODULE_LICENSE("GPL v2");