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Linux/drivers/dma/dw/platform.c

  1 /*
  2  * Platform driver for the Synopsys DesignWare DMA Controller
  3  *
  4  * Copyright (C) 2007-2008 Atmel Corporation
  5  * Copyright (C) 2010-2011 ST Microelectronics
  6  * Copyright (C) 2013 Intel Corporation
  7  *
  8  * Some parts of this driver are derived from the original dw_dmac.
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  */
 14 
 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 
 28 struct dw_dma_of_filter_args {
 29         struct dw_dma *dw;
 30         unsigned int req;
 31         unsigned int src;
 32         unsigned int dst;
 33 };
 34 
 35 static 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         /* Ensure the device matches our channel */
 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 
 51 static 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         /* TODO: there should be a simpler way to do this */
 76         return dma_request_channel(cap, dw_dma_of_filter, &fargs);
 77 }
 78 
 79 #ifdef CONFIG_ACPI
 80 static 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 
 96 static 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 /* !CONFIG_ACPI */
116 static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
117 #endif /* !CONFIG_ACPI */
118 
119 #ifdef CONFIG_OF
120 static struct dw_dma_platform_data *
121 dw_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
166 static inline struct dw_dma_platform_data *
167 dw_dma_parse_dt(struct platform_device *pdev)
168 {
169         return NULL;
170 }
171 #endif
172 
173 static 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         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
195         if (err)
196                 return err;
197 
198         pdata = dev_get_platdata(dev);
199         if (!pdata)
200                 pdata = dw_dma_parse_dt(pdev);
201 
202         chip->dev = dev;
203 
204         err = dw_dma_probe(chip, pdata);
205         if (err)
206                 return err;
207 
208         platform_set_drvdata(pdev, chip);
209 
210         if (pdev->dev.of_node) {
211                 err = of_dma_controller_register(pdev->dev.of_node,
212                                                  dw_dma_of_xlate, chip->dw);
213                 if (err)
214                         dev_err(&pdev->dev,
215                                 "could not register of_dma_controller\n");
216         }
217 
218         if (ACPI_HANDLE(&pdev->dev))
219                 dw_dma_acpi_controller_register(chip->dw);
220 
221         return 0;
222 }
223 
224 static int dw_remove(struct platform_device *pdev)
225 {
226         struct dw_dma_chip *chip = platform_get_drvdata(pdev);
227 
228         if (pdev->dev.of_node)
229                 of_dma_controller_free(pdev->dev.of_node);
230 
231         return dw_dma_remove(chip);
232 }
233 
234 static void dw_shutdown(struct platform_device *pdev)
235 {
236         struct dw_dma_chip *chip = platform_get_drvdata(pdev);
237 
238         dw_dma_shutdown(chip);
239 }
240 
241 #ifdef CONFIG_OF
242 static const struct of_device_id dw_dma_of_id_table[] = {
243         { .compatible = "snps,dma-spear1340" },
244         {}
245 };
246 MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
247 #endif
248 
249 #ifdef CONFIG_ACPI
250 static const struct acpi_device_id dw_dma_acpi_id_table[] = {
251         { "INTL9C60", 0 },
252         { }
253 };
254 MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table);
255 #endif
256 
257 #ifdef CONFIG_PM_SLEEP
258 
259 static int dw_suspend_noirq(struct device *dev)
260 {
261         struct platform_device *pdev = to_platform_device(dev);
262         struct dw_dma_chip *chip = platform_get_drvdata(pdev);
263 
264         return dw_dma_suspend(chip);
265 }
266 
267 static int dw_resume_noirq(struct device *dev)
268 {
269         struct platform_device *pdev = to_platform_device(dev);
270         struct dw_dma_chip *chip = platform_get_drvdata(pdev);
271 
272         return dw_dma_resume(chip);
273 }
274 
275 #else /* !CONFIG_PM_SLEEP */
276 
277 #define dw_suspend_noirq        NULL
278 #define dw_resume_noirq         NULL
279 
280 #endif /* !CONFIG_PM_SLEEP */
281 
282 static const struct dev_pm_ops dw_dev_pm_ops = {
283         .suspend_noirq = dw_suspend_noirq,
284         .resume_noirq = dw_resume_noirq,
285         .freeze_noirq = dw_suspend_noirq,
286         .thaw_noirq = dw_resume_noirq,
287         .restore_noirq = dw_resume_noirq,
288         .poweroff_noirq = dw_suspend_noirq,
289 };
290 
291 static struct platform_driver dw_driver = {
292         .probe          = dw_probe,
293         .remove         = dw_remove,
294         .shutdown       = dw_shutdown,
295         .driver = {
296                 .name   = "dw_dmac",
297                 .pm     = &dw_dev_pm_ops,
298                 .of_match_table = of_match_ptr(dw_dma_of_id_table),
299                 .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
300         },
301 };
302 
303 static int __init dw_init(void)
304 {
305         return platform_driver_register(&dw_driver);
306 }
307 subsys_initcall(dw_init);
308 
309 static void __exit dw_exit(void)
310 {
311         platform_driver_unregister(&dw_driver);
312 }
313 module_exit(dw_exit);
314 
315 MODULE_LICENSE("GPL v2");
316 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");
317 

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