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/usb.h> 41 #include <linux/usb/c67x00.h> 42 43 #include "c67x00.h" 44 #include "c67x00-hcd.h" 45 46 static void c67x00_probe_sie(struct c67x00_sie *sie, 47 struct c67x00_device *dev, int sie_num) 48 { 49 spin_lock_init(&sie->lock); 50 sie->dev = dev; 51 sie->sie_num = sie_num; 52 sie->mode = c67x00_sie_config(dev->pdata->sie_config, sie_num); 53 54 switch (sie->mode) { 55 case C67X00_SIE_HOST: 56 c67x00_hcd_probe(sie); 57 break; 58 59 case C67X00_SIE_UNUSED: 60 dev_info(sie_dev(sie), 61 "Not using SIE %d as requested\n", sie->sie_num); 62 break; 63 64 default: 65 dev_err(sie_dev(sie), 66 "Unsupported configuration: 0x%x for SIE %d\n", 67 sie->mode, sie->sie_num); 68 break; 69 } 70 } 71 72 static void c67x00_remove_sie(struct c67x00_sie *sie) 73 { 74 switch (sie->mode) { 75 case C67X00_SIE_HOST: 76 c67x00_hcd_remove(sie); 77 break; 78 79 default: 80 break; 81 } 82 } 83 84 static irqreturn_t c67x00_irq(int irq, void *__dev) 85 { 86 struct c67x00_device *c67x00 = __dev; 87 struct c67x00_sie *sie; 88 u16 msg, int_status; 89 int i, count = 8; 90 91 int_status = c67x00_ll_hpi_status(c67x00); 92 if (!int_status) 93 return IRQ_NONE; 94 95 while (int_status != 0 && (count-- >= 0)) { 96 c67x00_ll_irq(c67x00, int_status); 97 for (i = 0; i < C67X00_SIES; i++) { 98 sie = &c67x00->sie[i]; 99 msg = 0; 100 if (int_status & SIEMSG_FLG(i)) 101 msg = c67x00_ll_fetch_siemsg(c67x00, i); 102 if (sie->irq) 103 sie->irq(sie, int_status, msg); 104 } 105 int_status = c67x00_ll_hpi_status(c67x00); 106 } 107 108 if (int_status) 109 dev_warn(&c67x00->pdev->dev, "Not all interrupts handled! " 110 "status = 0x%04x\n", int_status); 111 112 return IRQ_HANDLED; 113 } 114 115 /* ------------------------------------------------------------------------- */ 116 117 static int __devinit c67x00_drv_probe(struct platform_device *pdev) 118 { 119 struct c67x00_device *c67x00; 120 struct c67x00_platform_data *pdata; 121 struct resource *res, *res2; 122 int ret, i; 123 124 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 125 if (!res) 126 return -ENODEV; 127 128 res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 129 if (!res2) 130 return -ENODEV; 131 132 pdata = pdev->dev.platform_data; 133 if (!pdata) 134 return -ENODEV; 135 136 c67x00 = kzalloc(sizeof(*c67x00), GFP_KERNEL); 137 if (!c67x00) 138 return -ENOMEM; 139 140 if (!request_mem_region(res->start, res->end - res->start + 1, 141 pdev->name)) { 142 dev_err(&pdev->dev, "Memory region busy\n"); 143 ret = -EBUSY; 144 goto request_mem_failed; 145 } 146 c67x00->hpi.base = ioremap(res->start, res->end - res->start + 1); 147 if (!c67x00->hpi.base) { 148 dev_err(&pdev->dev, "Unable to map HPI registers\n"); 149 ret = -EIO; 150 goto map_failed; 151 } 152 153 spin_lock_init(&c67x00->hpi.lock); 154 c67x00->hpi.regstep = pdata->hpi_regstep; 155 c67x00->pdata = pdev->dev.platform_data; 156 c67x00->pdev = pdev; 157 158 c67x00_ll_init(c67x00); 159 c67x00_ll_hpi_reg_init(c67x00); 160 161 ret = request_irq(res2->start, c67x00_irq, 0, pdev->name, c67x00); 162 if (ret) { 163 dev_err(&pdev->dev, "Cannot claim IRQ\n"); 164 goto request_irq_failed; 165 } 166 167 ret = c67x00_ll_reset(c67x00); 168 if (ret) { 169 dev_err(&pdev->dev, "Device reset failed\n"); 170 goto reset_failed; 171 } 172 173 for (i = 0; i < C67X00_SIES; i++) 174 c67x00_probe_sie(&c67x00->sie[i], c67x00, i); 175 176 platform_set_drvdata(pdev, c67x00); 177 178 return 0; 179 180 reset_failed: 181 free_irq(res2->start, c67x00); 182 request_irq_failed: 183 iounmap(c67x00->hpi.base); 184 map_failed: 185 release_mem_region(res->start, res->end - res->start + 1); 186 request_mem_failed: 187 kfree(c67x00); 188 189 return ret; 190 } 191 192 static int __devexit c67x00_drv_remove(struct platform_device *pdev) 193 { 194 struct c67x00_device *c67x00 = platform_get_drvdata(pdev); 195 struct resource *res; 196 int i; 197 198 for (i = 0; i < C67X00_SIES; i++) 199 c67x00_remove_sie(&c67x00->sie[i]); 200 201 c67x00_ll_release(c67x00); 202 203 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 204 if (res) 205 free_irq(res->start, c67x00); 206 207 iounmap(c67x00->hpi.base); 208 209 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 210 if (res) 211 release_mem_region(res->start, res->end - res->start + 1); 212 213 kfree(c67x00); 214 215 return 0; 216 } 217 218 static struct platform_driver c67x00_driver = { 219 .probe = c67x00_drv_probe, 220 .remove = __devexit_p(c67x00_drv_remove), 221 .driver = { 222 .owner = THIS_MODULE, 223 .name = "c67x00", 224 }, 225 }; 226 MODULE_ALIAS("platform:c67x00"); 227 228 static int __init c67x00_init(void) 229 { 230 return platform_driver_register(&c67x00_driver); 231 } 232 233 static void __exit c67x00_exit(void) 234 { 235 platform_driver_unregister(&c67x00_driver); 236 } 237 238 module_init(c67x00_init); 239 module_exit(c67x00_exit); 240 241 MODULE_AUTHOR("Peter Korsgaard, Jan Veldeman, Grant Likely"); 242 MODULE_DESCRIPTION("Cypress C67X00 USB Controller Driver"); 243 MODULE_LICENSE("GPL"); 244