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         /* Apply default dma_mask if needed */
 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
 226 static 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
 236 static 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
 244 static const struct of_device_id dw_dma_of_id_table[] = {
 245         { .compatible = "snps,dma-spear1340" },
 246         {}
 247 };
 248 MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
 249 #endif
 250
 251 #ifdef CONFIG_ACPI
 252 static const struct acpi_device_id dw_dma_acpi_id_table[] = {
 253         { "INTL9C60", 0 },
 254         { }
 255 };
 256 MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table);
 257 #endif
 258
 259 #ifdef CONFIG_PM_SLEEP
 260
 261 static int dw_suspend_noirq(struct device *dev)
 262 {
 263         struct platform_device *pdev = to_platform_device(dev);
 264         struct dw_dma_chip *chip = platform_get_drvdata(pdev);
 265
 266         return dw_dma_suspend(chip);
 267 }
 268
 269 static int dw_resume_noirq(struct device *dev)
 270 {
 271         struct platform_device *pdev = to_platform_device(dev);
 272         struct dw_dma_chip *chip = platform_get_drvdata(pdev);
 273
 274         return dw_dma_resume(chip);
 275 }
 276
 277 #else /* !CONFIG_PM_SLEEP */
 278
 279 #define dw_suspend_noirq        NULL
 280 #define dw_resume_noirq         NULL
 281
 282 #endif /* !CONFIG_PM_SLEEP */
 283
 284 static const struct dev_pm_ops dw_dev_pm_ops = {
 285         .suspend_noirq = dw_suspend_noirq,
 286         .resume_noirq = dw_resume_noirq,
 287         .freeze_noirq = dw_suspend_noirq,
 288         .thaw_noirq = dw_resume_noirq,
 289         .restore_noirq = dw_resume_noirq,
 290         .poweroff_noirq = dw_suspend_noirq,
 291 };
 292
 293 static struct platform_driver dw_driver = {
 294         .probe          = dw_probe,
 295         .remove         = dw_remove,
 296         .shutdown       = dw_shutdown,
 297         .driver = {
 298                 .name   = "dw_dmac",
 299                 .pm     = &dw_dev_pm_ops,
 300                 .of_match_table = of_match_ptr(dw_dma_of_id_table),
 301                 .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
 302         },
 303 };
 304
 305 static int __init dw_init(void)
 306 {
 307         return platform_driver_register(&dw_driver);
 308 }
 309 subsys_initcall(dw_init);
 310
 311 static void __exit dw_exit(void)
 312 {
 313         platform_driver_unregister(&dw_driver);
 314 }
 315 module_exit(dw_exit);
 316
 317 MODULE_LICENSE("GPL v2");
 318 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");