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15#include <linux/module.h>
16#include <linux/device.h>
17#include <linux/clk.h>
18#include <linux/platform_device.h>
19#include <linux/dmaengine.h>
20#include <linux/dma-mapping.h>
21#include <linux/of.h>
22#include <linux/of_dma.h>
23#include <linux/acpi.h>
24#include <linux/acpi_dma.h>
25
26#include "internal.h"
27
28struct dw_dma_of_filter_args {
29 struct dw_dma *dw;
30 unsigned int req;
31 unsigned int src;
32 unsigned int dst;
33};
34
35static bool dw_dma_of_filter(struct dma_chan *chan, void *param)
36{
37 struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
38 struct dw_dma_of_filter_args *fargs = param;
39
40
41 if (chan->device != &fargs->dw->dma)
42 return false;
43
44 dwc->request_line = fargs->req;
45 dwc->src_master = fargs->src;
46 dwc->dst_master = fargs->dst;
47
48 return true;
49}
50
51static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
52 struct of_dma *ofdma)
53{
54 struct dw_dma *dw = ofdma->of_dma_data;
55 struct dw_dma_of_filter_args fargs = {
56 .dw = dw,
57 };
58 dma_cap_mask_t cap;
59
60 if (dma_spec->args_count != 3)
61 return NULL;
62
63 fargs.req = dma_spec->args[0];
64 fargs.src = dma_spec->args[1];
65 fargs.dst = dma_spec->args[2];
66
67 if (WARN_ON(fargs.req >= DW_DMA_MAX_NR_REQUESTS ||
68 fargs.src >= dw->nr_masters ||
69 fargs.dst >= dw->nr_masters))
70 return NULL;
71
72 dma_cap_zero(cap);
73 dma_cap_set(DMA_SLAVE, cap);
74
75
76 return dma_request_channel(cap, dw_dma_of_filter, &fargs);
77}
78
79#ifdef CONFIG_ACPI
80static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
81{
82 struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
83 struct acpi_dma_spec *dma_spec = param;
84
85 if (chan->device->dev != dma_spec->dev ||
86 chan->chan_id != dma_spec->chan_id)
87 return false;
88
89 dwc->request_line = dma_spec->slave_id;
90 dwc->src_master = dwc_get_sms(NULL);
91 dwc->dst_master = dwc_get_dms(NULL);
92
93 return true;
94}
95
96static void dw_dma_acpi_controller_register(struct dw_dma *dw)
97{
98 struct device *dev = dw->dma.dev;
99 struct acpi_dma_filter_info *info;
100 int ret;
101
102 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
103 if (!info)
104 return;
105
106 dma_cap_zero(info->dma_cap);
107 dma_cap_set(DMA_SLAVE, info->dma_cap);
108 info->filter_fn = dw_dma_acpi_filter;
109
110 ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
111 info);
112 if (ret)
113 dev_err(dev, "could not register acpi_dma_controller\n");
114}
115#else
116static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
117#endif
118
119#ifdef CONFIG_OF
120static struct dw_dma_platform_data *
121dw_dma_parse_dt(struct platform_device *pdev)
122{
123 struct device_node *np = pdev->dev.of_node;
124 struct dw_dma_platform_data *pdata;
125 u32 tmp, arr[4];
126
127 if (!np) {
128 dev_err(&pdev->dev, "Missing DT data\n");
129 return NULL;
130 }
131
132 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
133 if (!pdata)
134 return NULL;
135
136 if (of_property_read_u32(np, "dma-channels", &pdata->nr_channels))
137 return NULL;
138
139 if (of_property_read_bool(np, "is_private"))
140 pdata->is_private = true;
141
142 if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
143 pdata->chan_allocation_order = (unsigned char)tmp;
144
145 if (!of_property_read_u32(np, "chan_priority", &tmp))
146 pdata->chan_priority = tmp;
147
148 if (!of_property_read_u32(np, "block_size", &tmp))
149 pdata->block_size = tmp;
150
151 if (!of_property_read_u32(np, "dma-masters", &tmp)) {
152 if (tmp > 4)
153 return NULL;
154
155 pdata->nr_masters = tmp;
156 }
157
158 if (!of_property_read_u32_array(np, "data_width", arr,
159 pdata->nr_masters))
160 for (tmp = 0; tmp < pdata->nr_masters; tmp++)
161 pdata->data_width[tmp] = arr[tmp];
162
163 return pdata;
164}
165#else
166static inline struct dw_dma_platform_data *
167dw_dma_parse_dt(struct platform_device *pdev)
168{
169 return NULL;
170}
171#endif
172
173static int dw_probe(struct platform_device *pdev)
174{
175 struct dw_dma_chip *chip;
176 struct device *dev = &pdev->dev;
177 struct resource *mem;
178 struct dw_dma_platform_data *pdata;
179 int err;
180
181 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
182 if (!chip)
183 return -ENOMEM;
184
185 chip->irq = platform_get_irq(pdev, 0);
186 if (chip->irq < 0)
187 return chip->irq;
188
189 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
190 chip->regs = devm_ioremap_resource(dev, mem);
191 if (IS_ERR(chip->regs))
192 return PTR_ERR(chip->regs);
193
194
195 if (!dev->dma_mask) {
196 dev->dma_mask = &dev->coherent_dma_mask;
197 dev->coherent_dma_mask = DMA_BIT_MASK(32);
198 }
199
200 pdata = dev_get_platdata(dev);
201 if (!pdata)
202 pdata = dw_dma_parse_dt(pdev);
203
204 chip->dev = dev;
205
206 err = dw_dma_probe(chip, pdata);
207 if (err)
208 return err;
209
210 platform_set_drvdata(pdev, chip);
211
212 if (pdev->dev.of_node) {
213 err = of_dma_controller_register(pdev->dev.of_node,
214 dw_dma_of_xlate, chip->dw);
215 if (err)
216 dev_err(&pdev->dev,
217 "could not register of_dma_controller\n");
218 }
219
220 if (ACPI_HANDLE(&pdev->dev))
221 dw_dma_acpi_controller_register(chip->dw);
222
223 return 0;
224}
225
226static int dw_remove(struct platform_device *pdev)
227{
228 struct dw_dma_chip *chip = platform_get_drvdata(pdev);
229
230 if (pdev->dev.of_node)
231 of_dma_controller_free(pdev->dev.of_node);
232
233 return dw_dma_remove(chip);
234}
235
236static void dw_shutdown(struct platform_device *pdev)
237{
238 struct dw_dma_chip *chip = platform_get_drvdata(pdev);
239
240 dw_dma_shutdown(chip);
241}
242
243#ifdef CONFIG_OF
244static const struct of_device_id dw_dma_of_id_table[] = {
245 { .compatible = "snps,dma-spear1340" },
246 {}
247};
248MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
249#endif
250
251#ifdef CONFIG_ACPI
252static const struct acpi_device_id dw_dma_acpi_id_table[] = {
253 { "INTL9C60", 0 },
254 { }
255};
256#endif
257
258#ifdef CONFIG_PM_SLEEP
259
260static int dw_suspend_noirq(struct device *dev)
261{
262 struct platform_device *pdev = to_platform_device(dev);
263 struct dw_dma_chip *chip = platform_get_drvdata(pdev);
264
265 return dw_dma_suspend(chip);
266}
267
268static int dw_resume_noirq(struct device *dev)
269{
270 struct platform_device *pdev = to_platform_device(dev);
271 struct dw_dma_chip *chip = platform_get_drvdata(pdev);
272
273 return dw_dma_resume(chip);
274}
275
276#else
277
278#define dw_suspend_noirq NULL
279#define dw_resume_noirq NULL
280
281#endif
282
283static const struct dev_pm_ops dw_dev_pm_ops = {
284 .suspend_noirq = dw_suspend_noirq,
285 .resume_noirq = dw_resume_noirq,
286 .freeze_noirq = dw_suspend_noirq,
287 .thaw_noirq = dw_resume_noirq,
288 .restore_noirq = dw_resume_noirq,
289 .poweroff_noirq = dw_suspend_noirq,
290};
291
292static struct platform_driver dw_driver = {
293 .probe = dw_probe,
294 .remove = dw_remove,
295 .shutdown = dw_shutdown,
296 .driver = {
297 .name = "dw_dmac",
298 .pm = &dw_dev_pm_ops,
299 .of_match_table = of_match_ptr(dw_dma_of_id_table),
300 .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
301 },
302};
303
304static int __init dw_init(void)
305{
306 return platform_driver_register(&dw_driver);
307}
308subsys_initcall(dw_init);
309
310static void __exit dw_exit(void)
311{
312 platform_driver_unregister(&dw_driver);
313}
314module_exit(dw_exit);
315
316MODULE_LICENSE("GPL v2");
317MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");
318
