summaryrefslogtreecommitdiffstats
path: root/drivers/remoteproc/wkup_m3_rproc.c
blob: 3984e585c847f0336af600a1c580d23bfb1ece84 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * TI AMx3 Wakeup M3 Remote Processor driver
 *
 * Copyright (C) 2014-2015 Texas Instruments, Inc.
 *
 * Dave Gerlach <d-gerlach@ti.com>
 * Suman Anna <s-anna@ti.com>
 */

#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/remoteproc.h>

#include <linux/platform_data/wkup_m3.h>

#include "remoteproc_internal.h"

#define WKUPM3_MEM_MAX	2

/**
 * struct wkup_m3_mem - WkupM3 internal memory structure
 * @cpu_addr: MPU virtual address of the memory region
 * @bus_addr: Bus address used to access the memory region
 * @dev_addr: Device address from Wakeup M3 view
 * @size: Size of the memory region
 */
struct wkup_m3_mem {
	void __iomem *cpu_addr;
	phys_addr_t bus_addr;
	u32 dev_addr;
	size_t size;
};

/**
 * struct wkup_m3_rproc - WkupM3 remote processor state
 * @rproc: rproc handle
 * @pdev: pointer to platform device
 * @mem: WkupM3 memory information
 */
struct wkup_m3_rproc {
	struct rproc *rproc;
	struct platform_device *pdev;
	struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
};

static int wkup_m3_rproc_start(struct rproc *rproc)
{
	struct wkup_m3_rproc *wkupm3 = rproc->priv;
	struct platform_device *pdev = wkupm3->pdev;
	struct device *dev = &pdev->dev;
	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);

	if (pdata->deassert_reset(pdev, pdata->reset_name)) {
		dev_err(dev, "Unable to reset wkup_m3!\n");
		return -ENODEV;
	}

	return 0;
}

static int wkup_m3_rproc_stop(struct rproc *rproc)
{
	struct wkup_m3_rproc *wkupm3 = rproc->priv;
	struct platform_device *pdev = wkupm3->pdev;
	struct device *dev = &pdev->dev;
	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);

	if (pdata->assert_reset(pdev, pdata->reset_name)) {
		dev_err(dev, "Unable to assert reset of wkup_m3!\n");
		return -ENODEV;
	}

	return 0;
}

static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
{
	struct wkup_m3_rproc *wkupm3 = rproc->priv;
	void *va = NULL;
	int i;
	u32 offset;

	if (len <= 0)
		return NULL;

	for (i = 0; i < WKUPM3_MEM_MAX; i++) {
		if (da >= wkupm3->mem[i].dev_addr && da + len <=
		    wkupm3->mem[i].dev_addr +  wkupm3->mem[i].size) {
			offset = da -  wkupm3->mem[i].dev_addr;
			/* __force to make sparse happy with type conversion */
			va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
			break;
		}
	}

	return va;
}

static const struct rproc_ops wkup_m3_rproc_ops = {
	.start		= wkup_m3_rproc_start,
	.stop		= wkup_m3_rproc_stop,
	.da_to_va	= wkup_m3_rproc_da_to_va,
};

static const struct of_device_id wkup_m3_rproc_of_match[] = {
	{ .compatible = "ti,am3352-wkup-m3", },
	{ .compatible = "ti,am4372-wkup-m3", },
	{},
};
MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);

static int wkup_m3_rproc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct wkup_m3_platform_data *pdata = dev->platform_data;
	/* umem always needs to be processed first */
	const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
	struct wkup_m3_rproc *wkupm3;
	const char *fw_name;
	struct rproc *rproc;
	struct resource *res;
	const __be32 *addrp;
	u32 l4_offset = 0;
	u64 size;
	int ret;
	int i;

	if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
	      pdata->reset_name)) {
		dev_err(dev, "Platform data missing!\n");
		return -ENODEV;
	}

	ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
				      &fw_name);
	if (ret) {
		dev_err(dev, "No firmware filename given\n");
		return -ENODEV;
	}

	pm_runtime_enable(&pdev->dev);
	ret = pm_runtime_get_sync(&pdev->dev);
	if (ret < 0) {
		dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
		goto err;
	}

	rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
			    fw_name, sizeof(*wkupm3));
	if (!rproc) {
		ret = -ENOMEM;
		goto err;
	}

	rproc->auto_boot = false;

	wkupm3 = rproc->priv;
	wkupm3->rproc = rproc;
	wkupm3->pdev = pdev;

	for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						   mem_names[i]);
		wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
		if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
			dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
				i);
			ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
			goto err;
		}
		wkupm3->mem[i].bus_addr = res->start;
		wkupm3->mem[i].size = resource_size(res);
		addrp = of_get_address(dev->of_node, i, &size, NULL);
		/*
		 * The wkupm3 has umem at address 0 in its view, so the device
		 * addresses for each memory region is computed as a relative
		 * offset of the bus address for umem, and therefore needs to be
		 * processed first.
		 */
		if (!strcmp(mem_names[i], "umem"))
			l4_offset = be32_to_cpu(*addrp);
		wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
	}

	dev_set_drvdata(dev, rproc);

	ret = rproc_add(rproc);
	if (ret) {
		dev_err(dev, "rproc_add failed\n");
		goto err_put_rproc;
	}

	return 0;

err_put_rproc:
	rproc_free(rproc);
err:
	pm_runtime_put_noidle(dev);
	pm_runtime_disable(dev);
	return ret;
}

static int wkup_m3_rproc_remove(struct platform_device *pdev)
{
	struct rproc *rproc = platform_get_drvdata(pdev);

	rproc_del(rproc);
	rproc_free(rproc);
	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	return 0;
}

#ifdef CONFIG_PM
static int wkup_m3_rpm_suspend(struct device *dev)
{
	return -EBUSY;
}

static int wkup_m3_rpm_resume(struct device *dev)
{
	return 0;
}
#endif

static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
	SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
};

static struct platform_driver wkup_m3_rproc_driver = {
	.probe = wkup_m3_rproc_probe,
	.remove = wkup_m3_rproc_remove,
	.driver = {
		.name = "wkup_m3_rproc",
		.of_match_table = wkup_m3_rproc_of_match,
		.pm = &wkup_m3_rproc_pm_ops,
	},
};

module_platform_driver(wkup_m3_rproc_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");