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 */ dwc2_driver_remove(struct platform_device * dev)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 = ¶ms_bcm2835 }, 130 { .compatible = "rockchip,rk3066-usb", .data = ¶ms_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 */ dwc2_driver_probe(struct platform_device * dev)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