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 = ¶ms_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