drivers/usb/dwc2/platform.c

   1 /*
   2  * platform.c - DesignWare HS OTG Controller platform driver
   3  *
   4  * Copyright (C) Matthijs Kooijman <matthijs@stdin.nl>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions, and the following disclaimer,
  11  *    without modification.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The names of the above-listed copyright holders may not be used
  16  *    to endorse or promote products derived from this software without
  17  *    specific prior written permission.
  18  *
  19  * ALTERNATIVELY, this software may be distributed under the terms of the
  20  * GNU General Public License ("GPL") as published by the Free Software
  21  * Foundation; either version 2 of the License, or (at your option) any
  22  * later version.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  25  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  26  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  30  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  31  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  33  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/slab.h>
  40 #include <linux/device.h>
  41 #include <linux/dma-mapping.h>
  42 #include <linux/of_device.h>
  43 #include <linux/platform_device.h>
  44
  45 #include "core.h"
  46 #include "hcd.h"
  47
  48 static const char dwc2_driver_name[] = "dwc2";
  49
  50 static const struct dwc2_core_params params_bcm2835 = {
  51         .otg_cap                        = 0,    /* HNP/SRP capable */
  52         .otg_ver                        = 0,    /* 1.3 */
  53         .dma_enable                     = 1,
  54         .dma_desc_enable                = 0,
  55         .speed                          = 0,    /* High Speed */
  56         .enable_dynamic_fifo            = 1,
  57         .en_multiple_tx_fifo            = 1,
  58         .host_rx_fifo_size              = 774,  /* 774 DWORDs */
  59         .host_nperio_tx_fifo_size       = 256,  /* 256 DWORDs */
  60         .host_perio_tx_fifo_size        = 512,  /* 512 DWORDs */
  61         .max_transfer_size              = 65535,
  62         .max_packet_count               = 511,
  63         .host_channels                  = 8,
  64         .phy_type                       = 1,    /* UTMI */
  65         .phy_utmi_width                 = 8,    /* 8 bits */
  66         .phy_ulpi_ddr                   = 0,    /* Single */
  67         .phy_ulpi_ext_vbus              = 0,
  68         .i2c_enable                     = 0,
  69         .ulpi_fs_ls                     = 0,
  70         .host_support_fs_ls_low_power   = 0,
  71         .host_ls_low_power_phy_clk      = 0,    /* 48 MHz */
  72         .ts_dline                       = 0,
  73         .reload_ctl                     = 0,
  74         .ahbcfg                         = 0x10,
  75         .uframe_sched                   = 0,
  76 };
  77
  78 /**
  79  * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
  80  * DWC_otg driver
  81  *
  82  * @dev: Platform device
  83  *
  84  * This routine is called, for example, when the rmmod command is executed. The
  85  * device may or may not be electrically present. If it is present, the driver
  86  * stops device processing. Any resources used on behalf of this device are
  87  * freed.
  88  */
  89 static int dwc2_driver_remove(struct platform_device *dev)
  90 {
  91         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
  92
  93         dwc2_hcd_remove(hsotg);
  94
  95         return 0;
  96 }
  97
  98 static const struct of_device_id dwc2_of_match_table[] = {
  99         { .compatible = "brcm,bcm2835-usb", .data = &params_bcm2835 },
 100         { .compatible = "snps,dwc2", .data = NULL },
 101         {},
 102 };
 103 MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
 104
 105 /**
 106  * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
 107  * driver
 108  *
 109  * @dev: Platform device
 110  *
 111  * This routine creates the driver components required to control the device
 112  * (core, HCD, and PCD) and initializes the device. The driver components are
 113  * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
 114  * in the device private data. This allows the driver to access the dwc2_hsotg
 115  * structure on subsequent calls to driver methods for this device.
 116  */
 117 static int dwc2_driver_probe(struct platform_device *dev)
 118 {
 119         const struct of_device_id *match;
 120         const struct dwc2_core_params *params;
 121         struct dwc2_core_params defparams;
 122         struct dwc2_hsotg *hsotg;
 123         struct resource *res;
 124         int retval;
 125         int irq;
 126
 127         if (usb_disabled())
 128                 return -ENODEV;
 129
 130         match = of_match_device(dwc2_of_match_table, &dev->dev);
 131         if (match && match->data) {
 132                 params = match->data;
 133         } else {
 134                 /* Default all params to autodetect */
 135                 dwc2_set_all_params(&defparams, -1);
 136                 params = &defparams;
 137
 138                 /*
 139                  * Disable descriptor dma mode by default as the HW can support
 140                  * it, but does not support it for SPLIT transactions.
 141                  */
 142                 defparams.dma_desc_enable = 0;
 143         }
 144
 145         hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
 146         if (!hsotg)
 147                 return -ENOMEM;
 148
 149         hsotg->dev = &dev->dev;
 150
 151         /*
 152          * Use reasonable defaults so platforms don't have to provide these.
 153          */
 154         if (!dev->dev.dma_mask)
 155                 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
 156         retval = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
 157         if (retval)
 158                 return retval;
 159
 160         irq = platform_get_irq(dev, 0);
 161         if (irq < 0) {
 162                 dev_err(&dev->dev, "missing IRQ resource\n");
 163                 return irq;
 164         }
 165
 166         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 167         hsotg->regs = devm_ioremap_resource(&dev->dev, res);
 168         if (IS_ERR(hsotg->regs))
 169                 return PTR_ERR(hsotg->regs);
 170
 171         dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
 172                 (unsigned long)res->start, hsotg->regs);
 173
 174         retval = dwc2_hcd_init(hsotg, irq, params);
 175         if (retval)
 176                 return retval;
 177
 178         platform_set_drvdata(dev, hsotg);
 179
 180         return retval;
 181 }
 182
 183 static struct platform_driver dwc2_platform_driver = {
 184         .driver = {
 185                 .name = dwc2_driver_name,
 186                 .of_match_table = dwc2_of_match_table,
 187         },
 188         .probe = dwc2_driver_probe,
 189         .remove = dwc2_driver_remove,
 190 };
 191
 192 module_platform_driver(dwc2_platform_driver);
 193
 194 MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
 195 MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
 196 MODULE_LICENSE("Dual BSD/GPL");