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");