aboutsummaryrefslogtreecommitdiff
path: root/drivers/dma/dw/platform.c
blob: 453822cc4f9d3a9a9c7b62626c7362c13ee8b931 (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
/*
 * Platform driver for the Synopsys DesignWare DMA Controller
 *
 * Copyright (C) 2007-2008 Atmel Corporation
 * Copyright (C) 2010-2011 ST Microelectronics
 * Copyright (C) 2013 Intel Corporation
 *
 * Some parts of this driver are derived from the original dw_dmac.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/device.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/acpi.h>
#include <linux/acpi_dma.h>

#include "internal.h"

struct dw_dma_of_filter_args {
	struct dw_dma *dw;
	unsigned int req;
	unsigned int src;
	unsigned int dst;
};

static bool dw_dma_of_filter(struct dma_chan *chan, void *param)
{
	struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
	struct dw_dma_of_filter_args *fargs = param;

	/* Ensure the device matches our channel */
	if (chan->device != &fargs->dw->dma)
		return false;

	dwc->request_line = fargs->req;
	dwc->src_master	= fargs->src;
	dwc->dst_master	= fargs->dst;

	return true;
}

static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
					struct of_dma *ofdma)
{
	struct dw_dma *dw = ofdma->of_dma_data;
	struct dw_dma_of_filter_args fargs = {
		.dw = dw,
	};
	dma_cap_mask_t cap;

	if (dma_spec->args_count != 3)
		return NULL;

	fargs.req = dma_spec->args[0];
	fargs.src = dma_spec->args[1];
	fargs.dst = dma_spec->args[2];

	if (WARN_ON(fargs.req >= DW_DMA_MAX_NR_REQUESTS ||
		    fargs.src >= dw->nr_masters ||
		    fargs.dst >= dw->nr_masters))
		return NULL;

	dma_cap_zero(cap);
	dma_cap_set(DMA_SLAVE, cap);

	/* TODO: there should be a simpler way to do this */
	return dma_request_channel(cap, dw_dma_of_filter, &fargs);
}

#ifdef CONFIG_ACPI
static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
{
	struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
	struct acpi_dma_spec *dma_spec = param;

	if (chan->device->dev != dma_spec->dev ||
	    chan->chan_id != dma_spec->chan_id)
		return false;

	dwc->request_line = dma_spec->slave_id;
	dwc->src_master = dwc_get_sms(NULL);
	dwc->dst_master = dwc_get_dms(NULL);

	return true;
}

static void dw_dma_acpi_controller_register(struct dw_dma *dw)
{
	struct device *dev = dw->dma.dev;
	struct acpi_dma_filter_info *info;
	int ret;

	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return;

	dma_cap_zero(info->dma_cap);
	dma_cap_set(DMA_SLAVE, info->dma_cap);
	info->filter_fn = dw_dma_acpi_filter;

	ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
						info);
	if (ret)
		dev_err(dev, "could not register acpi_dma_controller\n");
}
#else /* !CONFIG_ACPI */
static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
#endif /* !CONFIG_ACPI */

#ifdef CONFIG_OF
static struct dw_dma_platform_data *
dw_dma_parse_dt(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct dw_dma_platform_data *pdata;
	u32 tmp, arr[4];

	if (!np) {
		dev_err(&pdev->dev, "Missing DT data\n");
		return NULL;
	}

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return NULL;

	if (of_property_read_u32(np, "dma-channels", &pdata->nr_channels))
		return NULL;

	if (of_property_read_bool(np, "is_private"))
		pdata->is_private = true;

	if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
		pdata->chan_allocation_order = (unsigned char)tmp;

	if (!of_property_read_u32(np, "chan_priority", &tmp))
		pdata->chan_priority = tmp;

	if (!of_property_read_u32(np, "block_size", &tmp))
		pdata->block_size = tmp;

	if (!of_property_read_u32(np, "dma-masters", &tmp)) {
		if (tmp > 4)
			return NULL;

		pdata->nr_masters = tmp;
	}

	if (!of_property_read_u32_array(np, "data_width", arr,
				pdata->nr_masters))
		for (tmp = 0; tmp < pdata->nr_masters; tmp++)
			pdata->data_width[tmp] = arr[tmp];

	return pdata;
}
#else
static inline struct dw_dma_platform_data *
dw_dma_parse_dt(struct platform_device *pdev)
{
	return NULL;
}
#endif

static int dw_probe(struct platform_device *pdev)
{
	struct dw_dma_chip *chip;
	struct device *dev = &pdev->dev;
	struct resource *mem;
	struct dw_dma_platform_data *pdata;
	int err;

	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

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

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	chip->regs = devm_ioremap_resource(dev, mem);
	if (IS_ERR(chip->regs))
		return PTR_ERR(chip->regs);

	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
	if (err)
		return err;

	pdata = dev_get_platdata(dev);
	if (!pdata)
		pdata = dw_dma_parse_dt(pdev);

	chip->dev = dev;

	err = dw_dma_probe(chip, pdata);
	if (err)
		return err;

	platform_set_drvdata(pdev, chip);

	if (pdev->dev.of_node) {
		err = of_dma_controller_register(pdev->dev.of_node,
						 dw_dma_of_xlate, chip->dw);
		if (err)
			dev_err(&pdev->dev,
				"could not register of_dma_controller\n");
	}

	if (ACPI_HANDLE(&pdev->dev))
		dw_dma_acpi_controller_register(chip->dw);

	return 0;
}

static int dw_remove(struct platform_device *pdev)
{
	struct dw_dma_chip *chip = platform_get_drvdata(pdev);

	if (pdev->dev.of_node)
		of_dma_controller_free(pdev->dev.of_node);

	return dw_dma_remove(chip);
}

static void dw_shutdown(struct platform_device *pdev)
{
	struct dw_dma_chip *chip = platform_get_drvdata(pdev);

	dw_dma_shutdown(chip);
}

#ifdef CONFIG_OF
static const struct of_device_id dw_dma_of_id_table[] = {
	{ .compatible = "snps,dma-spear1340" },
	{}
};
MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id dw_dma_acpi_id_table[] = {
	{ "INTL9C60", 0 },
	{ }
};
MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table);
#endif

#ifdef CONFIG_PM_SLEEP

static int dw_suspend_noirq(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct dw_dma_chip *chip = platform_get_drvdata(pdev);

	return dw_dma_suspend(chip);
}

static int dw_resume_noirq(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct dw_dma_chip *chip = platform_get_drvdata(pdev);

	return dw_dma_resume(chip);
}

#else /* !CONFIG_PM_SLEEP */

#define dw_suspend_noirq	NULL
#define dw_resume_noirq		NULL

#endif /* !CONFIG_PM_SLEEP */

static const struct dev_pm_ops dw_dev_pm_ops = {
	.suspend_noirq = dw_suspend_noirq,
	.resume_noirq = dw_resume_noirq,
	.freeze_noirq = dw_suspend_noirq,
	.thaw_noirq = dw_resume_noirq,
	.restore_noirq = dw_resume_noirq,
	.poweroff_noirq = dw_suspend_noirq,
};

static struct platform_driver dw_driver = {
	.probe		= dw_probe,
	.remove		= dw_remove,
	.shutdown	= dw_shutdown,
	.driver = {
		.name	= "dw_dmac",
		.pm	= &dw_dev_pm_ops,
		.of_match_table = of_match_ptr(dw_dma_of_id_table),
		.acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
	},
};

static int __init dw_init(void)
{
	return platform_driver_register(&dw_driver);
}
subsys_initcall(dw_init);

static void __exit dw_exit(void)
{
	platform_driver_unregister(&dw_driver);
}
module_exit(dw_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");