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Linux/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");
197 

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