1 /* 2 * c67x00-drv.c: Cypress C67X00 USB Common infrastructure 3 * 4 * Copyright (C) 2006-2008 Barco N.V. 5 * Derived from the Cypress cy7c67200/300 ezusb linux driver and 6 * based on multiple host controller drivers inside the linux kernel. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 21 * MA 02110-1301 USA. 22 */ 23 24 /* 25 * This file implements the common infrastructure for using the c67x00. 26 * It is both the link between the platform configuration and subdrivers and 27 * the link between the common hardware parts and the subdrivers (e.g. 28 * interrupt handling). 29 * 30 * The c67x00 has 2 SIE's (serial interface engine) wich can be configured 31 * to be host, device or OTG (with some limitations, E.G. only SIE1 can be OTG). 32 * 33 * Depending on the platform configuration, the SIE's are created and 34 * the corresponding subdriver is initialized (c67x00_probe_sie). 35 */ 36 37 #include <linux/device.h> 38 #include <linux/io.h> 39 #include <linux/list.h> 40 #include <linux/slab.h> 41 #include <linux/usb.h> 42 #include <linux/usb/c67x00.h> 43 44 #include "c67x00.h" 45 #include "c67x00-hcd.h" 46 47 static void c67x00_probe_sie(struct c67x00_sie *sie, 48 struct c67x00_device *dev, int sie_num) 49 { 50 spin_lock_init(&sie->lock); 51 sie->dev = dev; 52 sie->sie_num = sie_num; 53 sie->mode = c67x00_sie_config(dev->pdata->sie_config, sie_num); 54 55 switch (sie->mode) { 56 case C67X00_SIE_HOST: 57 c67x00_hcd_probe(sie); 58 break; 59 60 case C67X00_SIE_UNUSED: 61 dev_info(sie_dev(sie), 62 "Not using SIE %d as requested\n", sie->sie_num); 63 break; 64 65 default: 66 dev_err(sie_dev(sie), 67 "Unsupported configuration: 0x%x for SIE %d\n", 68 sie->mode, sie->sie_num); 69 break; 70 } 71 } 72 73 static void c67x00_remove_sie(struct c67x00_sie *sie) 74 { 75 switch (sie->mode) { 76 case C67X00_SIE_HOST: 77 c67x00_hcd_remove(sie); 78 break; 79 80 default: 81 break; 82 } 83 } 84 85 static irqreturn_t c67x00_irq(int irq, void *__dev) 86 { 87 struct c67x00_device *c67x00 = __dev; 88 struct c67x00_sie *sie; 89 u16 msg, int_status; 90 int i, count = 8; 91 92 int_status = c67x00_ll_hpi_status(c67x00); 93 if (!int_status) 94 return IRQ_NONE; 95 96 while (int_status != 0 && (count-- >= 0)) { 97 c67x00_ll_irq(c67x00, int_status); 98 for (i = 0; i < C67X00_SIES; i++) { 99 sie = &c67x00->sie[i]; 100 msg = 0; 101 if (int_status & SIEMSG_FLG(i)) 102 msg = c67x00_ll_fetch_siemsg(c67x00, i); 103 if (sie->irq) 104 sie->irq(sie, int_status, msg); 105 } 106 int_status = c67x00_ll_hpi_status(c67x00); 107 } 108 109 if (int_status) 110 dev_warn(&c67x00->pdev->dev, "Not all interrupts handled! " 111 "status = 0x%04x\n", int_status); 112 113 return IRQ_HANDLED; 114 } 115 116 /* ------------------------------------------------------------------------- */ 117 118 static int __devinit c67x00_drv_probe(struct platform_device *pdev) 119 { 120 struct c67x00_device *c67x00; 121 struct c67x00_platform_data *pdata; 122 struct resource *res, *res2; 123 int ret, i; 124 125 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 126 if (!res) 127 return -ENODEV; 128 129 res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 130 if (!res2) 131 return -ENODEV; 132 133 pdata = pdev->dev.platform_data; 134 if (!pdata) 135 return -ENODEV; 136 137 c67x00 = kzalloc(sizeof(*c67x00), GFP_KERNEL); 138 if (!c67x00) 139 return -ENOMEM; 140 141 if (!request_mem_region(res->start, resource_size(res), 142 pdev->name)) { 143 dev_err(&pdev->dev, "Memory region busy\n"); 144 ret = -EBUSY; 145 goto request_mem_failed; 146 } 147 c67x00->hpi.base = ioremap(res->start, resource_size(res)); 148 if (!c67x00->hpi.base) { 149 dev_err(&pdev->dev, "Unable to map HPI registers\n"); 150 ret = -EIO; 151 goto map_failed; 152 } 153 154 spin_lock_init(&c67x00->hpi.lock); 155 c67x00->hpi.regstep = pdata->hpi_regstep; 156 c67x00->pdata = pdev->dev.platform_data; 157 c67x00->pdev = pdev; 158 159 c67x00_ll_init(c67x00); 160 c67x00_ll_hpi_reg_init(c67x00); 161 162 ret = request_irq(res2->start, c67x00_irq, 0, pdev->name, c67x00); 163 if (ret) { 164 dev_err(&pdev->dev, "Cannot claim IRQ\n"); 165 goto request_irq_failed; 166 } 167 168 ret = c67x00_ll_reset(c67x00); 169 if (ret) { 170 dev_err(&pdev->dev, "Device reset failed\n"); 171 goto reset_failed; 172 } 173 174 for (i = 0; i < C67X00_SIES; i++) 175 c67x00_probe_sie(&c67x00->sie[i], c67x00, i); 176 177 platform_set_drvdata(pdev, c67x00); 178 179 return 0; 180 181 reset_failed: 182 free_irq(res2->start, c67x00); 183 request_irq_failed: 184 iounmap(c67x00->hpi.base); 185 map_failed: 186 release_mem_region(res->start, resource_size(res)); 187 request_mem_failed: 188 kfree(c67x00); 189 190 return ret; 191 } 192 193 static int __devexit c67x00_drv_remove(struct platform_device *pdev) 194 { 195 struct c67x00_device *c67x00 = platform_get_drvdata(pdev); 196 struct resource *res; 197 int i; 198 199 for (i = 0; i < C67X00_SIES; i++) 200 c67x00_remove_sie(&c67x00->sie[i]); 201 202 c67x00_ll_release(c67x00); 203 204 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 205 if (res) 206 free_irq(res->start, c67x00); 207 208 iounmap(c67x00->hpi.base); 209 210 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 211 if (res) 212 release_mem_region(res->start, resource_size(res)); 213 214 kfree(c67x00); 215 216 return 0; 217 } 218 219 static struct platform_driver c67x00_driver = { 220 .probe = c67x00_drv_probe, 221 .remove = __devexit_p(c67x00_drv_remove), 222 .driver = { 223 .owner = THIS_MODULE, 224 .name = "c67x00", 225 }, 226 }; 227 MODULE_ALIAS("platform:c67x00"); 228 229 static int __init c67x00_init(void) 230 { 231 return platform_driver_register(&c67x00_driver); 232 } 233 234 static void __exit c67x00_exit(void) 235 { 236 platform_driver_unregister(&c67x00_driver); 237 } 238 239 module_init(c67x00_init); 240 module_exit(c67x00_exit); 241 242 MODULE_AUTHOR("Peter Korsgaard, Jan Veldeman, Grant Likely"); 243 MODULE_DESCRIPTION("Cypress C67X00 USB Controller Driver"); 244 MODULE_LICENSE("GPL"); 245