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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 <linux/usb/of.h>
 46 
 47 #include "core.h"
 48 #include "hcd.h"
 49 
 50 static const char dwc2_driver_name[] = "dwc2";
 51 
 52 static const struct dwc2_core_params params_bcm2835 = {
 53         .otg_cap                        = 0,    /* HNP/SRP capable */
 54         .otg_ver                        = 0,    /* 1.3 */
 55         .dma_enable                     = 1,
 56         .dma_desc_enable                = 0,
 57         .speed                          = 0,    /* High Speed */
 58         .enable_dynamic_fifo            = 1,
 59         .en_multiple_tx_fifo            = 1,
 60         .host_rx_fifo_size              = 774,  /* 774 DWORDs */
 61         .host_nperio_tx_fifo_size       = 256,  /* 256 DWORDs */
 62         .host_perio_tx_fifo_size        = 512,  /* 512 DWORDs */
 63         .max_transfer_size              = 65535,
 64         .max_packet_count               = 511,
 65         .host_channels                  = 8,
 66         .phy_type                       = 1,    /* UTMI */
 67         .phy_utmi_width                 = 8,    /* 8 bits */
 68         .phy_ulpi_ddr                   = 0,    /* Single */
 69         .phy_ulpi_ext_vbus              = 0,
 70         .i2c_enable                     = 0,
 71         .ulpi_fs_ls                     = 0,
 72         .host_support_fs_ls_low_power   = 0,
 73         .host_ls_low_power_phy_clk      = 0,    /* 48 MHz */
 74         .ts_dline                       = 0,
 75         .reload_ctl                     = 0,
 76         .ahbcfg                         = 0x10,
 77         .uframe_sched                   = 0,
 78 };
 79 
 80 static const struct dwc2_core_params params_rk3066 = {
 81         .otg_cap                        = 2,    /* non-HNP/non-SRP */
 82         .otg_ver                        = -1,
 83         .dma_enable                     = -1,
 84         .dma_desc_enable                = 0,
 85         .speed                          = -1,
 86         .enable_dynamic_fifo            = 1,
 87         .en_multiple_tx_fifo            = -1,
 88         .host_rx_fifo_size              = 520,  /* 520 DWORDs */
 89         .host_nperio_tx_fifo_size       = 128,  /* 128 DWORDs */
 90         .host_perio_tx_fifo_size        = 256,  /* 256 DWORDs */
 91         .max_transfer_size              = 65535,
 92         .max_packet_count               = -1,
 93         .host_channels                  = -1,
 94         .phy_type                       = -1,
 95         .phy_utmi_width                 = -1,
 96         .phy_ulpi_ddr                   = -1,
 97         .phy_ulpi_ext_vbus              = -1,
 98         .i2c_enable                     = -1,
 99         .ulpi_fs_ls                     = -1,
100         .host_support_fs_ls_low_power   = -1,
101         .host_ls_low_power_phy_clk      = -1,
102         .ts_dline                       = -1,
103         .reload_ctl                     = -1,
104         .ahbcfg                         = 0x7, /* INCR16 */
105         .uframe_sched                   = -1,
106 };
107 
108 /**
109  * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
110  * DWC_otg driver
111  *
112  * @dev: Platform device
113  *
114  * This routine is called, for example, when the rmmod command is executed. The
115  * device may or may not be electrically present. If it is present, the driver
116  * stops device processing. Any resources used on behalf of this device are
117  * freed.
118  */
119 static int dwc2_driver_remove(struct platform_device *dev)
120 {
121         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
122 
123         dwc2_hcd_remove(hsotg);
124 
125         return 0;
126 }
127 
128 static const struct of_device_id dwc2_of_match_table[] = {
129         { .compatible = "brcm,bcm2835-usb", .data = &params_bcm2835 },
130         { .compatible = "rockchip,rk3066-usb", .data = &params_rk3066 },
131         { .compatible = "snps,dwc2", .data = NULL },
132         {},
133 };
134 MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
135 
136 /**
137  * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
138  * driver
139  *
140  * @dev: Platform device
141  *
142  * This routine creates the driver components required to control the device
143  * (core, HCD, and PCD) and initializes the device. The driver components are
144  * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
145  * in the device private data. This allows the driver to access the dwc2_hsotg
146  * structure on subsequent calls to driver methods for this device.
147  */
148 static int dwc2_driver_probe(struct platform_device *dev)
149 {
150         const struct of_device_id *match;
151         const struct dwc2_core_params *params;
152         struct dwc2_core_params defparams;
153         struct dwc2_hsotg *hsotg;
154         struct resource *res;
155         int retval;
156         int irq;
157 
158         if (usb_disabled())
159                 return -ENODEV;
160 
161         match = of_match_device(dwc2_of_match_table, &dev->dev);
162         if (match && match->data) {
163                 params = match->data;
164         } else {
165                 /* Default all params to autodetect */
166                 dwc2_set_all_params(&defparams, -1);
167                 params = &defparams;
168 
169                 /*
170                  * Disable descriptor dma mode by default as the HW can support
171                  * it, but does not support it for SPLIT transactions.
172                  */
173                 defparams.dma_desc_enable = 0;
174         }
175 
176         hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
177         if (!hsotg)
178                 return -ENOMEM;
179 
180         hsotg->dev = &dev->dev;
181 
182         /*
183          * Use reasonable defaults so platforms don't have to provide these.
184          */
185         if (!dev->dev.dma_mask)
186                 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
187         retval = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
188         if (retval)
189                 return retval;
190 
191         irq = platform_get_irq(dev, 0);
192         if (irq < 0) {
193                 dev_err(&dev->dev, "missing IRQ resource\n");
194                 return irq;
195         }
196 
197         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
198         hsotg->regs = devm_ioremap_resource(&dev->dev, res);
199         if (IS_ERR(hsotg->regs))
200                 return PTR_ERR(hsotg->regs);
201 
202         dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
203                 (unsigned long)res->start, hsotg->regs);
204 
205         hsotg->dr_mode = of_usb_get_dr_mode(dev->dev.of_node);
206 
207         retval = dwc2_hcd_init(hsotg, irq, params);
208         if (retval)
209                 return retval;
210 
211         platform_set_drvdata(dev, hsotg);
212 
213         return retval;
214 }
215 
216 static struct platform_driver dwc2_platform_driver = {
217         .driver = {
218                 .name = dwc2_driver_name,
219                 .of_match_table = dwc2_of_match_table,
220         },
221         .probe = dwc2_driver_probe,
222         .remove = dwc2_driver_remove,
223 };
224 
225 module_platform_driver(dwc2_platform_driver);
226 
227 MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
228 MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
229 MODULE_LICENSE("Dual BSD/GPL");
230 

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