drivers/pci/hotplug/cpcihp_zt5550.c

   1 /*
   2  * cpcihp_zt5550.c
   3  *
   4  * Intel/Ziatech ZT5550 CompactPCI Host Controller driver
   5  *
   6  * Copyright 2002 SOMA Networks, Inc.
   7  * Copyright 2001 Intel San Luis Obispo
   8  * Copyright 2000,2001 MontaVista Software Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the
  12  * Free Software Foundation; either version 2 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  16  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  17  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  18  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  22  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  23  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  24  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * You should have received a copy of the GNU General Public License along
  27  * with this program; if not, write to the Free Software Foundation, Inc.,
  28  * 675 Mass Ave, Cambridge, MA 02139, USA.
  29  *
  30  * Send feedback to <scottm@somanetworks.com>
  31  */
  32
  33 #include <linux/config.h>
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/init.h>
  37 #include <linux/errno.h>
  38 #include <linux/pci.h>
  39 #include "cpci_hotplug.h"
  40 #include "cpcihp_zt5550.h"
  41
  42 #define DRIVER_VERSION  "0.2"
  43 #define DRIVER_AUTHOR   "Scott Murray <scottm@somanetworks.com>"
  44 #define DRIVER_DESC     "ZT5550 CompactPCI Hot Plug Driver"
  45
  46 #define MY_NAME "cpcihp_zt5550"
  47
  48 #define dbg(format, arg...)                                     \
  49         do {                                                    \
  50                 if(debug)                                       \
  51                         printk (KERN_DEBUG "%s: " format "\n",  \
  52                                 MY_NAME , ## arg);              \
  53         } while(0)
  54 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
  55 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
  56 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
  57
  58 /* local variables */
  59 static int debug;
  60 static int poll;
  61 static struct cpci_hp_controller_ops zt5550_hpc_ops;
  62 static struct cpci_hp_controller zt5550_hpc;
  63
  64 /* Primary cPCI bus bridge device */
  65 static struct pci_dev *bus0_dev;
  66 static struct pci_bus *bus0;
  67
  68 /* Host controller device */
  69 static struct pci_dev *hc_dev;
  70
  71 /* Host controller register addresses */
  72 static void __iomem *hc_registers;
  73 static void __iomem *csr_hc_index;
  74 static void __iomem *csr_hc_data;
  75 static void __iomem *csr_int_status;
  76 static void __iomem *csr_int_mask;
  77
  78
  79 static int zt5550_hc_config(struct pci_dev *pdev)
  80 {
  81         /* Since we know that no boards exist with two HC chips, treat it as an error */
  82         if(hc_dev) {
  83                 err("too many host controller devices?");
  84                 return -EBUSY;
  85         }
  86         hc_dev = pdev;
  87         dbg("hc_dev = %p", hc_dev);
  88         dbg("pci resource start %lx", pci_resource_start(hc_dev, 1));
  89         dbg("pci resource len %lx", pci_resource_len(hc_dev, 1));
  90
  91         if(!request_mem_region(pci_resource_start(hc_dev, 1),
  92                                 pci_resource_len(hc_dev, 1), MY_NAME)) {
  93                 err("cannot reserve MMIO region");
  94                 return -ENOMEM;
  95         }
  96
  97         hc_registers =
  98             ioremap(pci_resource_start(hc_dev, 1), pci_resource_len(hc_dev, 1));
  99         if(!hc_registers) {
 100                 err("cannot remap MMIO region %lx @ %lx",
 101                     pci_resource_len(hc_dev, 1), pci_resource_start(hc_dev, 1));
 102                 release_mem_region(pci_resource_start(hc_dev, 1),
 103                                    pci_resource_len(hc_dev, 1));
 104                 return -ENODEV;
 105         }
 106
 107         csr_hc_index = hc_registers + CSR_HCINDEX;
 108         csr_hc_data = hc_registers + CSR_HCDATA;
 109         csr_int_status = hc_registers + CSR_INTSTAT;
 110         csr_int_mask = hc_registers + CSR_INTMASK;
 111
 112         /*
 113          * Disable host control, fault and serial interrupts
 114          */
 115         dbg("disabling host control, fault and serial interrupts");
 116         writeb((u8) HC_INT_MASK_REG, csr_hc_index);
 117         writeb((u8) ALL_INDEXED_INTS_MASK, csr_hc_data);
 118         dbg("disabled host control, fault and serial interrupts");
 119
 120         /*
 121          * Disable timer0, timer1 and ENUM interrupts
 122          */
 123         dbg("disabling timer0, timer1 and ENUM interrupts");
 124         writeb((u8) ALL_DIRECT_INTS_MASK, csr_int_mask);
 125         dbg("disabled timer0, timer1 and ENUM interrupts");
 126         return 0;
 127 }
 128
 129 static int zt5550_hc_cleanup(void)
 130 {
 131         if(!hc_dev)
 132                 return -ENODEV;
 133
 134         iounmap(hc_registers);
 135         release_mem_region(pci_resource_start(hc_dev, 1),
 136                            pci_resource_len(hc_dev, 1));
 137         return 0;
 138 }
 139
 140 static int zt5550_hc_query_enum(void)
 141 {
 142         u8 value;
 143
 144         value = inb_p(ENUM_PORT);
 145         return ((value & ENUM_MASK) == ENUM_MASK);
 146 }
 147
 148 static int zt5550_hc_check_irq(void *dev_id)
 149 {
 150         int ret;
 151         u8 reg;
 152
 153         ret = 0;
 154         if(dev_id == zt5550_hpc.dev_id) {
 155                 reg = readb(csr_int_status);
 156                 if(reg)
 157                         ret = 1;
 158         }
 159         return ret;
 160 }
 161
 162 static int zt5550_hc_enable_irq(void)
 163 {
 164         u8 reg;
 165
 166         if(hc_dev == NULL) {
 167                 return -ENODEV;
 168         }
 169         reg = readb(csr_int_mask);
 170         reg = reg & ~ENUM_INT_MASK;
 171         writeb(reg, csr_int_mask);
 172         return 0;
 173 }
 174
 175 static int zt5550_hc_disable_irq(void)
 176 {
 177         u8 reg;
 178
 179         if(hc_dev == NULL) {
 180                 return -ENODEV;
 181         }
 182
 183         reg = readb(csr_int_mask);
 184         reg = reg | ENUM_INT_MASK;
 185         writeb(reg, csr_int_mask);
 186         return 0;
 187 }
 188
 189 static int zt5550_hc_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 190 {
 191         int status;
 192
 193         status = zt5550_hc_config(pdev);
 194         if(status != 0) {
 195                 return status;
 196         }
 197         dbg("returned from zt5550_hc_config");
 198
 199         memset(&zt5550_hpc, 0, sizeof (struct cpci_hp_controller));
 200         zt5550_hpc_ops.query_enum = zt5550_hc_query_enum;
 201         zt5550_hpc.ops = &zt5550_hpc_ops;
 202         if(!poll) {
 203                 zt5550_hpc.irq = hc_dev->irq;
 204                 zt5550_hpc.irq_flags = SA_SHIRQ;
 205                 zt5550_hpc.dev_id = hc_dev;
 206
 207                 zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq;
 208                 zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq;
 209                 zt5550_hpc_ops.check_irq = zt5550_hc_check_irq;
 210         } else {
 211                 info("using ENUM# polling mode");
 212         }
 213
 214         status = cpci_hp_register_controller(&zt5550_hpc);
 215         if(status != 0) {
 216                 err("could not register cPCI hotplug controller");
 217                 goto init_hc_error;
 218         }
 219         dbg("registered controller");
 220
 221         /* Look for first device matching cPCI bus's bridge vendor and device IDs */
 222         if(!(bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
 223                                          PCI_DEVICE_ID_DEC_21154, NULL))) {
 224                 status = -ENODEV;
 225                 goto init_register_error;
 226         }
 227         bus0 = bus0_dev->subordinate;
 228         pci_dev_put(bus0_dev);
 229
 230         status = cpci_hp_register_bus(bus0, 0x0a, 0x0f);
 231         if(status != 0) {
 232                 err("could not register cPCI hotplug bus");
 233                 goto init_register_error;
 234         }
 235         dbg("registered bus");
 236
 237         status = cpci_hp_start();
 238         if(status != 0) {
 239                 err("could not started cPCI hotplug system");
 240                 cpci_hp_unregister_bus(bus0);
 241                 goto init_register_error;
 242         }
 243         dbg("started cpci hp system");
 244
 245         return 0;
 246 init_register_error:
 247         cpci_hp_unregister_controller(&zt5550_hpc);
 248 init_hc_error:
 249         err("status = %d", status);
 250         zt5550_hc_cleanup();
 251         return status;
 252
 253 }
 254
 255 static void __devexit zt5550_hc_remove_one(struct pci_dev *pdev)
 256 {
 257         cpci_hp_stop();
 258         cpci_hp_unregister_bus(bus0);
 259         cpci_hp_unregister_controller(&zt5550_hpc);
 260         zt5550_hc_cleanup();
 261 }
 262
 263
 264 static struct pci_device_id zt5550_hc_pci_tbl[] = {
 265         { PCI_VENDOR_ID_ZIATECH, PCI_DEVICE_ID_ZIATECH_5550_HC, PCI_ANY_ID, PCI_ANY_ID, },
 266         { 0, }
 267 };
 268 MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl);
 269
 270 static struct pci_driver zt5550_hc_driver = {
 271         .name           = "zt5550_hc",
 272         .id_table       = zt5550_hc_pci_tbl,
 273         .probe          = zt5550_hc_init_one,
 274         .remove         = __devexit_p(zt5550_hc_remove_one),
 275 };
 276
 277 static int __init zt5550_init(void)
 278 {
 279         struct resource* r;
 280
 281         info(DRIVER_DESC " version: " DRIVER_VERSION);
 282         r = request_region(ENUM_PORT, 1, "#ENUM hotswap signal register");
 283         if(!r)
 284                 return -EBUSY;
 285
 286         return pci_register_driver(&zt5550_hc_driver);
 287 }
 288
 289 static void __exit
 290 zt5550_exit(void)
 291 {
 292         pci_unregister_driver(&zt5550_hc_driver);
 293         release_region(ENUM_PORT, 1);
 294 }
 295
 296 module_init(zt5550_init);
 297 module_exit(zt5550_exit);
 298
 299 MODULE_AUTHOR(DRIVER_AUTHOR);
 300 MODULE_DESCRIPTION(DRIVER_DESC);
 301 MODULE_LICENSE("GPL");
 302 module_param(debug, bool, 0644);
 303 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
 304 module_param(poll, bool, 0644);
 305 MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not");