summaryrefslogtreecommitdiff
path: root/drivers/remoteproc/ingenic_rproc.c
blob: e2618c36eaabc5379eeee01058d50542272567e3 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Ingenic JZ47xx remoteproc driver
 * Copyright 2019, Paul Cercueil <paul@crapouillou.net>
 */

#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>

#include "remoteproc_internal.h"

#define REG_AUX_CTRL		0x0
#define REG_AUX_MSG_ACK		0x10
#define REG_AUX_MSG		0x14
#define REG_CORE_MSG_ACK	0x18
#define REG_CORE_MSG		0x1C

#define AUX_CTRL_SLEEP		BIT(31)
#define AUX_CTRL_MSG_IRQ_EN	BIT(3)
#define AUX_CTRL_NMI_RESETS	BIT(2)
#define AUX_CTRL_NMI		BIT(1)
#define AUX_CTRL_SW_RESET	BIT(0)

static bool auto_boot;
module_param(auto_boot, bool, 0400);
MODULE_PARM_DESC(auto_boot,
		 "Auto-boot the remote processor [default=false]");

struct vpu_mem_map {
	const char *name;
	unsigned int da;
};

struct vpu_mem_info {
	const struct vpu_mem_map *map;
	unsigned long len;
	void __iomem *base;
};

static const struct vpu_mem_map vpu_mem_map[] = {
	{ "tcsm0", 0x132b0000 },
	{ "tcsm1", 0xf4000000 },
	{ "sram",  0x132f0000 },
};

/**
 * struct vpu - Ingenic VPU remoteproc private structure
 * @irq: interrupt number
 * @clks: pointers to the VPU and AUX clocks
 * @aux_base: raw pointer to the AUX interface registers
 * @mem_info: array of struct vpu_mem_info, which contain the mapping info of
 *            each of the external memories
 * @dev: private pointer to the device
 */
struct vpu {
	int irq;
	struct clk_bulk_data clks[2];
	void __iomem *aux_base;
	struct vpu_mem_info mem_info[ARRAY_SIZE(vpu_mem_map)];
	struct device *dev;
};

static int ingenic_rproc_prepare(struct rproc *rproc)
{
	struct vpu *vpu = rproc->priv;
	int ret;

	/* The clocks must be enabled for the firmware to be loaded in TCSM */
	ret = clk_bulk_prepare_enable(ARRAY_SIZE(vpu->clks), vpu->clks);
	if (ret)
		dev_err(vpu->dev, "Unable to start clocks: %d\n", ret);

	return ret;
}

static int ingenic_rproc_unprepare(struct rproc *rproc)
{
	struct vpu *vpu = rproc->priv;

	clk_bulk_disable_unprepare(ARRAY_SIZE(vpu->clks), vpu->clks);

	return 0;
}

static int ingenic_rproc_start(struct rproc *rproc)
{
	struct vpu *vpu = rproc->priv;
	u32 ctrl;

	enable_irq(vpu->irq);

	/* Reset the AUX and enable message IRQ */
	ctrl = AUX_CTRL_NMI_RESETS | AUX_CTRL_NMI | AUX_CTRL_MSG_IRQ_EN;
	writel(ctrl, vpu->aux_base + REG_AUX_CTRL);

	return 0;
}

static int ingenic_rproc_stop(struct rproc *rproc)
{
	struct vpu *vpu = rproc->priv;

	disable_irq(vpu->irq);

	/* Keep AUX in reset mode */
	writel(AUX_CTRL_SW_RESET, vpu->aux_base + REG_AUX_CTRL);

	return 0;
}

static void ingenic_rproc_kick(struct rproc *rproc, int vqid)
{
	struct vpu *vpu = rproc->priv;

	writel(vqid, vpu->aux_base + REG_CORE_MSG);
}

static void *ingenic_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len)
{
	struct vpu *vpu = rproc->priv;
	void __iomem *va = NULL;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(vpu_mem_map); i++) {
		const struct vpu_mem_info *info = &vpu->mem_info[i];
		const struct vpu_mem_map *map = info->map;

		if (da >= map->da && (da + len) < (map->da + info->len)) {
			va = info->base + (da - map->da);
			break;
		}
	}

	return (__force void *)va;
}

static const struct rproc_ops ingenic_rproc_ops = {
	.prepare = ingenic_rproc_prepare,
	.unprepare = ingenic_rproc_unprepare,
	.start = ingenic_rproc_start,
	.stop = ingenic_rproc_stop,
	.kick = ingenic_rproc_kick,
	.da_to_va = ingenic_rproc_da_to_va,
};

static irqreturn_t vpu_interrupt(int irq, void *data)
{
	struct rproc *rproc = data;
	struct vpu *vpu = rproc->priv;
	u32 vring;

	vring = readl(vpu->aux_base + REG_AUX_MSG);

	/* Ack the interrupt */
	writel(0, vpu->aux_base + REG_AUX_MSG_ACK);

	return rproc_vq_interrupt(rproc, vring);
}

static int ingenic_rproc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct resource *mem;
	struct rproc *rproc;
	struct vpu *vpu;
	unsigned int i;
	int ret;

	rproc = devm_rproc_alloc(dev, "ingenic-vpu",
				 &ingenic_rproc_ops, NULL, sizeof(*vpu));
	if (!rproc)
		return -ENOMEM;

	rproc->auto_boot = auto_boot;

	vpu = rproc->priv;
	vpu->dev = &pdev->dev;
	platform_set_drvdata(pdev, vpu);

	mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "aux");
	vpu->aux_base = devm_ioremap_resource(dev, mem);
	if (IS_ERR(vpu->aux_base)) {
		dev_err(dev, "Failed to ioremap\n");
		return PTR_ERR(vpu->aux_base);
	}

	for (i = 0; i < ARRAY_SIZE(vpu_mem_map); i++) {
		mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						   vpu_mem_map[i].name);

		vpu->mem_info[i].base = devm_ioremap_resource(dev, mem);
		if (IS_ERR(vpu->mem_info[i].base)) {
			ret = PTR_ERR(vpu->mem_info[i].base);
			dev_err(dev, "Failed to ioremap\n");
			return ret;
		}

		vpu->mem_info[i].len = resource_size(mem);
		vpu->mem_info[i].map = &vpu_mem_map[i];
	}

	vpu->clks[0].id = "vpu";
	vpu->clks[1].id = "aux";

	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(vpu->clks), vpu->clks);
	if (ret) {
		dev_err(dev, "Failed to get clocks\n");
		return ret;
	}

	vpu->irq = platform_get_irq(pdev, 0);
	if (vpu->irq < 0)
		return vpu->irq;

	ret = devm_request_irq(dev, vpu->irq, vpu_interrupt, 0, "VPU", rproc);
	if (ret < 0) {
		dev_err(dev, "Failed to request IRQ\n");
		return ret;
	}

	disable_irq(vpu->irq);

	ret = devm_rproc_add(dev, rproc);
	if (ret) {
		dev_err(dev, "Failed to register remote processor\n");
		return ret;
	}

	return 0;
}

static const struct of_device_id ingenic_rproc_of_matches[] = {
	{ .compatible = "ingenic,jz4770-vpu-rproc", },
	{}
};
MODULE_DEVICE_TABLE(of, ingenic_rproc_of_matches);

static struct platform_driver ingenic_rproc_driver = {
	.probe = ingenic_rproc_probe,
	.driver = {
		.name = "ingenic-vpu",
		.of_match_table = ingenic_rproc_of_matches,
	},
};
module_platform_driver(ingenic_rproc_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
MODULE_DESCRIPTION("Ingenic JZ47xx Remote Processor control driver");