summaryrefslogtreecommitdiff
path: root/drivers/remoteproc/st_slim_rproc.c
blob: d17719384c16532f54b28a71d4e66c76ea8f2ef9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * SLIM core rproc driver
 *
 * Copyright (C) 2016 STMicroelectronics
 *
 * Author: Peter Griffin <peter.griffin@linaro.org>
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>
#include <linux/remoteproc/st_slim_rproc.h>
#include "remoteproc_internal.h"

/* SLIM core registers */
#define SLIM_ID_OFST		0x0
#define SLIM_VER_OFST		0x4

#define SLIM_EN_OFST		0x8
#define SLIM_EN_RUN			BIT(0)

#define SLIM_CLK_GATE_OFST	0xC
#define SLIM_CLK_GATE_DIS		BIT(0)
#define SLIM_CLK_GATE_RESET		BIT(2)

#define SLIM_SLIM_PC_OFST	0x20

/* DMEM registers */
#define SLIM_REV_ID_OFST	0x0
#define SLIM_REV_ID_MIN_MASK		GENMASK(15, 8)
#define SLIM_REV_ID_MIN(id)		((id & SLIM_REV_ID_MIN_MASK) >> 8)
#define SLIM_REV_ID_MAJ_MASK		GENMASK(23, 16)
#define SLIM_REV_ID_MAJ(id)		((id & SLIM_REV_ID_MAJ_MASK) >> 16)


/* peripherals registers */
#define SLIM_STBUS_SYNC_OFST	0xF88
#define SLIM_STBUS_SYNC_DIS		BIT(0)

#define SLIM_INT_SET_OFST	0xFD4
#define SLIM_INT_CLR_OFST	0xFD8
#define SLIM_INT_MASK_OFST	0xFDC

#define SLIM_CMD_CLR_OFST	0xFC8
#define SLIM_CMD_MASK_OFST	0xFCC

static const char *mem_names[ST_SLIM_MEM_MAX] = {
	[ST_SLIM_DMEM]	= "dmem",
	[ST_SLIM_IMEM]	= "imem",
};

static int slim_clk_get(struct st_slim_rproc *slim_rproc, struct device *dev)
{
	int clk, err;

	for (clk = 0; clk < ST_SLIM_MAX_CLK; clk++) {
		slim_rproc->clks[clk] = of_clk_get(dev->of_node, clk);
		if (IS_ERR(slim_rproc->clks[clk])) {
			err = PTR_ERR(slim_rproc->clks[clk]);
			if (err == -EPROBE_DEFER)
				goto err_put_clks;
			slim_rproc->clks[clk] = NULL;
			break;
		}
	}

	return 0;

err_put_clks:
	while (--clk >= 0)
		clk_put(slim_rproc->clks[clk]);

	return err;
}

static void slim_clk_disable(struct st_slim_rproc *slim_rproc)
{
	int clk;

	for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
		clk_disable_unprepare(slim_rproc->clks[clk]);
}

static int slim_clk_enable(struct st_slim_rproc *slim_rproc)
{
	int clk, ret;

	for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++) {
		ret = clk_prepare_enable(slim_rproc->clks[clk]);
		if (ret)
			goto err_disable_clks;
	}

	return 0;

err_disable_clks:
	while (--clk >= 0)
		clk_disable_unprepare(slim_rproc->clks[clk]);

	return ret;
}

/*
 * Remoteproc slim specific device handlers
 */
static int slim_rproc_start(struct rproc *rproc)
{
	struct device *dev = &rproc->dev;
	struct st_slim_rproc *slim_rproc = rproc->priv;
	unsigned long hw_id, hw_ver, fw_rev;
	u32 val;

	/* disable CPU pipeline clock & reset CPU pipeline */
	val = SLIM_CLK_GATE_DIS | SLIM_CLK_GATE_RESET;
	writel(val, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);

	/* disable SLIM core STBus sync */
	writel(SLIM_STBUS_SYNC_DIS, slim_rproc->peri + SLIM_STBUS_SYNC_OFST);

	/* enable cpu pipeline clock */
	writel(!SLIM_CLK_GATE_DIS,
		slim_rproc->slimcore + SLIM_CLK_GATE_OFST);

	/* clear int & cmd mailbox */
	writel(~0U, slim_rproc->peri + SLIM_INT_CLR_OFST);
	writel(~0U, slim_rproc->peri + SLIM_CMD_CLR_OFST);

	/* enable all channels cmd & int */
	writel(~0U, slim_rproc->peri + SLIM_INT_MASK_OFST);
	writel(~0U, slim_rproc->peri + SLIM_CMD_MASK_OFST);

	/* enable cpu */
	writel(SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);

	hw_id = readl_relaxed(slim_rproc->slimcore + SLIM_ID_OFST);
	hw_ver = readl_relaxed(slim_rproc->slimcore + SLIM_VER_OFST);

	fw_rev = readl(slim_rproc->mem[ST_SLIM_DMEM].cpu_addr +
			SLIM_REV_ID_OFST);

	dev_info(dev, "fw rev:%ld.%ld on SLIM %ld.%ld\n",
		 SLIM_REV_ID_MAJ(fw_rev), SLIM_REV_ID_MIN(fw_rev),
		 hw_id, hw_ver);

	return 0;
}

static int slim_rproc_stop(struct rproc *rproc)
{
	struct st_slim_rproc *slim_rproc = rproc->priv;
	u32 val;

	/* mask all (cmd & int) channels */
	writel(0UL, slim_rproc->peri + SLIM_INT_MASK_OFST);
	writel(0UL, slim_rproc->peri + SLIM_CMD_MASK_OFST);

	/* disable cpu pipeline clock */
	writel(SLIM_CLK_GATE_DIS, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);

	writel(!SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);

	val = readl(slim_rproc->slimcore + SLIM_EN_OFST);
	if (val & SLIM_EN_RUN)
		dev_warn(&rproc->dev, "Failed to disable SLIM");

	dev_dbg(&rproc->dev, "slim stopped\n");

	return 0;
}

static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
{
	struct st_slim_rproc *slim_rproc = rproc->priv;
	void *va = NULL;
	int i;

	for (i = 0; i < ST_SLIM_MEM_MAX; i++) {
		if (da != slim_rproc->mem[i].bus_addr)
			continue;

		if (len <= slim_rproc->mem[i].size) {
			/* __force to make sparse happy with type conversion */
			va = (__force void *)slim_rproc->mem[i].cpu_addr;
			break;
		}
	}

	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%zx va = 0x%pK\n",
		da, len, va);

	return va;
}

static const struct rproc_ops slim_rproc_ops = {
	.start		= slim_rproc_start,
	.stop		= slim_rproc_stop,
	.da_to_va       = slim_rproc_da_to_va,
	.get_boot_addr	= rproc_elf_get_boot_addr,
	.load		= rproc_elf_load_segments,
	.sanity_check	= rproc_elf_sanity_check,
};

/**
 * st_slim_rproc_alloc() - allocate and initialise slim rproc
 * @pdev: Pointer to the platform_device struct
 * @fw_name: Name of firmware for rproc to use
 *
 * Function for allocating and initialising a slim rproc for use by
 * device drivers whose IP is based around the SLIM core. It
 * obtains and enables any clocks required by the SLIM core and also
 * ioremaps the various IO.
 *
 * Return: st_slim_rproc pointer or PTR_ERR() on error.
 */

struct st_slim_rproc *st_slim_rproc_alloc(struct platform_device *pdev,
				char *fw_name)
{
	struct device *dev = &pdev->dev;
	struct st_slim_rproc *slim_rproc;
	struct device_node *np = dev->of_node;
	struct rproc *rproc;
	struct resource *res;
	int err, i;

	if (!fw_name)
		return ERR_PTR(-EINVAL);

	if (!of_device_is_compatible(np, "st,slim-rproc"))
		return ERR_PTR(-EINVAL);

	rproc = rproc_alloc(dev, np->name, &slim_rproc_ops,
			fw_name, sizeof(*slim_rproc));
	if (!rproc)
		return ERR_PTR(-ENOMEM);

	rproc->has_iommu = false;

	slim_rproc = rproc->priv;
	slim_rproc->rproc = rproc;

	/* get imem and dmem */
	for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						mem_names[i]);

		slim_rproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
		if (IS_ERR(slim_rproc->mem[i].cpu_addr)) {
			dev_err(&pdev->dev, "devm_ioremap_resource failed\n");
			err = PTR_ERR(slim_rproc->mem[i].cpu_addr);
			goto err;
		}
		slim_rproc->mem[i].bus_addr = res->start;
		slim_rproc->mem[i].size = resource_size(res);
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "slimcore");
	slim_rproc->slimcore = devm_ioremap_resource(dev, res);
	if (IS_ERR(slim_rproc->slimcore)) {
		dev_err(&pdev->dev, "failed to ioremap slimcore IO\n");
		err = PTR_ERR(slim_rproc->slimcore);
		goto err;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "peripherals");
	slim_rproc->peri = devm_ioremap_resource(dev, res);
	if (IS_ERR(slim_rproc->peri)) {
		dev_err(&pdev->dev, "failed to ioremap peripherals IO\n");
		err = PTR_ERR(slim_rproc->peri);
		goto err;
	}

	err = slim_clk_get(slim_rproc, dev);
	if (err)
		goto err;

	err = slim_clk_enable(slim_rproc);
	if (err) {
		dev_err(dev, "Failed to enable clocks\n");
		goto err_clk_put;
	}

	/* Register as a remoteproc device */
	err = rproc_add(rproc);
	if (err) {
		dev_err(dev, "registration of slim remoteproc failed\n");
		goto err_clk_dis;
	}

	return slim_rproc;

err_clk_dis:
	slim_clk_disable(slim_rproc);
err_clk_put:
	for (i = 0; i < ST_SLIM_MAX_CLK && slim_rproc->clks[i]; i++)
		clk_put(slim_rproc->clks[i]);
err:
	rproc_free(rproc);
	return ERR_PTR(err);
}
EXPORT_SYMBOL(st_slim_rproc_alloc);

/**
  * st_slim_rproc_put() - put slim rproc resources
  * @slim_rproc: Pointer to the st_slim_rproc struct
  *
  * Function for calling respective _put() functions on slim_rproc resources.
  *
  */
void st_slim_rproc_put(struct st_slim_rproc *slim_rproc)
{
	int clk;

	if (!slim_rproc)
		return;

	slim_clk_disable(slim_rproc);

	for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
		clk_put(slim_rproc->clks[clk]);

	rproc_del(slim_rproc->rproc);
	rproc_free(slim_rproc->rproc);
}
EXPORT_SYMBOL(st_slim_rproc_put);

MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
MODULE_DESCRIPTION("STMicroelectronics SLIM core rproc driver");
MODULE_LICENSE("GPL v2");