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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/mutex.h>
 44 #include <linux/platform_device.h>
 45 
 46 #include <linux/usb/of.h>
 47 
 48 #include "core.h"
 49 #include "hcd.h"
 50 
 51 static const char dwc2_driver_name[] = "dwc2";
 52 
 53 static const struct dwc2_core_params params_bcm2835 = {
 54         .otg_cap                        = 0,    /* HNP/SRP capable */
 55         .otg_ver                        = 0,    /* 1.3 */
 56         .dma_enable                     = 1,
 57         .dma_desc_enable                = 0,
 58         .speed                          = 0,    /* High Speed */
 59         .enable_dynamic_fifo            = 1,
 60         .en_multiple_tx_fifo            = 1,
 61         .host_rx_fifo_size              = 774,  /* 774 DWORDs */
 62         .host_nperio_tx_fifo_size       = 256,  /* 256 DWORDs */
 63         .host_perio_tx_fifo_size        = 512,  /* 512 DWORDs */
 64         .max_transfer_size              = 65535,
 65         .max_packet_count               = 511,
 66         .host_channels                  = 8,
 67         .phy_type                       = 1,    /* UTMI */
 68         .phy_utmi_width                 = 8,    /* 8 bits */
 69         .phy_ulpi_ddr                   = 0,    /* Single */
 70         .phy_ulpi_ext_vbus              = 0,
 71         .i2c_enable                     = 0,
 72         .ulpi_fs_ls                     = 0,
 73         .host_support_fs_ls_low_power   = 0,
 74         .host_ls_low_power_phy_clk      = 0,    /* 48 MHz */
 75         .ts_dline                       = 0,
 76         .reload_ctl                     = 0,
 77         .ahbcfg                         = 0x10,
 78         .uframe_sched                   = 0,
 79 };
 80 
 81 static const struct dwc2_core_params params_rk3066 = {
 82         .otg_cap                        = 2,    /* non-HNP/non-SRP */
 83         .otg_ver                        = -1,
 84         .dma_enable                     = -1,
 85         .dma_desc_enable                = 0,
 86         .speed                          = -1,
 87         .enable_dynamic_fifo            = 1,
 88         .en_multiple_tx_fifo            = -1,
 89         .host_rx_fifo_size              = 520,  /* 520 DWORDs */
 90         .host_nperio_tx_fifo_size       = 128,  /* 128 DWORDs */
 91         .host_perio_tx_fifo_size        = 256,  /* 256 DWORDs */
 92         .max_transfer_size              = 65535,
 93         .max_packet_count               = -1,
 94         .host_channels                  = -1,
 95         .phy_type                       = -1,
 96         .phy_utmi_width                 = -1,
 97         .phy_ulpi_ddr                   = -1,
 98         .phy_ulpi_ext_vbus              = -1,
 99         .i2c_enable                     = -1,
100         .ulpi_fs_ls                     = -1,
101         .host_support_fs_ls_low_power   = -1,
102         .host_ls_low_power_phy_clk      = -1,
103         .ts_dline                       = -1,
104         .reload_ctl                     = -1,
105         .ahbcfg                         = 0x7, /* INCR16 */
106         .uframe_sched                   = -1,
107 };
108 
109 /**
110  * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
111  * DWC_otg driver
112  *
113  * @dev: Platform device
114  *
115  * This routine is called, for example, when the rmmod command is executed. The
116  * device may or may not be electrically present. If it is present, the driver
117  * stops device processing. Any resources used on behalf of this device are
118  * freed.
119  */
120 static int dwc2_driver_remove(struct platform_device *dev)
121 {
122         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
123 
124         if (hsotg->hcd_enabled)
125                 dwc2_hcd_remove(hsotg);
126         if (hsotg->gadget_enabled)
127                 s3c_hsotg_remove(hsotg);
128 
129         return 0;
130 }
131 
132 static const struct of_device_id dwc2_of_match_table[] = {
133         { .compatible = "brcm,bcm2835-usb", .data = &params_bcm2835 },
134         { .compatible = "rockchip,rk3066-usb", .data = &params_rk3066 },
135         { .compatible = "snps,dwc2", .data = NULL },
136         { .compatible = "samsung,s3c6400-hsotg", .data = NULL},
137         {},
138 };
139 MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
140 
141 /**
142  * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
143  * driver
144  *
145  * @dev: Platform device
146  *
147  * This routine creates the driver components required to control the device
148  * (core, HCD, and PCD) and initializes the device. The driver components are
149  * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
150  * in the device private data. This allows the driver to access the dwc2_hsotg
151  * structure on subsequent calls to driver methods for this device.
152  */
153 static int dwc2_driver_probe(struct platform_device *dev)
154 {
155         const struct of_device_id *match;
156         const struct dwc2_core_params *params;
157         struct dwc2_core_params defparams;
158         struct dwc2_hsotg *hsotg;
159         struct resource *res;
160         struct phy *phy;
161         struct usb_phy *uphy;
162         int retval;
163         int irq;
164 
165         match = of_match_device(dwc2_of_match_table, &dev->dev);
166         if (match && match->data) {
167                 params = match->data;
168         } else {
169                 /* Default all params to autodetect */
170                 dwc2_set_all_params(&defparams, -1);
171                 params = &defparams;
172 
173                 /*
174                  * Disable descriptor dma mode by default as the HW can support
175                  * it, but does not support it for SPLIT transactions.
176                  */
177                 defparams.dma_desc_enable = 0;
178         }
179 
180         hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
181         if (!hsotg)
182                 return -ENOMEM;
183 
184         hsotg->dev = &dev->dev;
185 
186         /*
187          * Use reasonable defaults so platforms don't have to provide these.
188          */
189         if (!dev->dev.dma_mask)
190                 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
191         retval = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
192         if (retval)
193                 return retval;
194 
195         irq = platform_get_irq(dev, 0);
196         if (irq < 0) {
197                 dev_err(&dev->dev, "missing IRQ resource\n");
198                 return irq;
199         }
200 
201         dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
202                 irq);
203         retval = devm_request_irq(hsotg->dev, irq,
204                                   dwc2_handle_common_intr, IRQF_SHARED,
205                                   dev_name(hsotg->dev), hsotg);
206         if (retval)
207                 return retval;
208 
209         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
210         hsotg->regs = devm_ioremap_resource(&dev->dev, res);
211         if (IS_ERR(hsotg->regs))
212                 return PTR_ERR(hsotg->regs);
213 
214         dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
215                 (unsigned long)res->start, hsotg->regs);
216 
217         hsotg->dr_mode = of_usb_get_dr_mode(dev->dev.of_node);
218 
219         /*
220          * Attempt to find a generic PHY, then look for an old style
221          * USB PHY
222          */
223         phy = devm_phy_get(&dev->dev, "usb2-phy");
224         if (IS_ERR(phy)) {
225                 hsotg->phy = NULL;
226                 uphy = devm_usb_get_phy(&dev->dev, USB_PHY_TYPE_USB2);
227                 if (IS_ERR(uphy))
228                         hsotg->uphy = NULL;
229                 else
230                         hsotg->uphy = uphy;
231         } else {
232                 hsotg->phy = phy;
233                 phy_power_on(hsotg->phy);
234                 phy_init(hsotg->phy);
235         }
236 
237         spin_lock_init(&hsotg->lock);
238         mutex_init(&hsotg->init_mutex);
239 
240         if (hsotg->dr_mode != USB_DR_MODE_HOST) {
241                 retval = dwc2_gadget_init(hsotg, irq);
242                 if (retval)
243                         return retval;
244                 hsotg->gadget_enabled = 1;
245         }
246 
247         if (hsotg->dr_mode != USB_DR_MODE_PERIPHERAL) {
248                 retval = dwc2_hcd_init(hsotg, irq, params);
249                 if (retval) {
250                         if (hsotg->gadget_enabled)
251                                 s3c_hsotg_remove(hsotg);
252                         return retval;
253                 }
254                 hsotg->hcd_enabled = 1;
255         }
256 
257         platform_set_drvdata(dev, hsotg);
258 
259         return retval;
260 }
261 
262 static int __maybe_unused dwc2_suspend(struct device *dev)
263 {
264         struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
265         int ret = 0;
266 
267         if (dwc2_is_device_mode(dwc2)) {
268                 ret = s3c_hsotg_suspend(dwc2);
269         } else {
270                 if (dwc2->lx_state == DWC2_L0)
271                         return 0;
272                 phy_exit(dwc2->phy);
273                 phy_power_off(dwc2->phy);
274 
275         }
276         return ret;
277 }
278 
279 static int __maybe_unused dwc2_resume(struct device *dev)
280 {
281         struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
282         int ret = 0;
283 
284         if (dwc2_is_device_mode(dwc2)) {
285                 ret = s3c_hsotg_resume(dwc2);
286         } else {
287                 phy_power_on(dwc2->phy);
288                 phy_init(dwc2->phy);
289 
290         }
291         return ret;
292 }
293 
294 static const struct dev_pm_ops dwc2_dev_pm_ops = {
295         SET_SYSTEM_SLEEP_PM_OPS(dwc2_suspend, dwc2_resume)
296 };
297 
298 static struct platform_driver dwc2_platform_driver = {
299         .driver = {
300                 .name = dwc2_driver_name,
301                 .of_match_table = dwc2_of_match_table,
302                 .pm = &dwc2_dev_pm_ops,
303         },
304         .probe = dwc2_driver_probe,
305         .remove = dwc2_driver_remove,
306 };
307 
308 module_platform_driver(dwc2_platform_driver);
309 
310 MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
311 MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
312 MODULE_LICENSE("Dual BSD/GPL");
313 

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