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/module.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/init.h>
  36 #include <linux/errno.h>
  37 #include <linux/pci.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/signal.h>       /* IRQF_SHARED */
  40 #include "cpci_hotplug.h"
  41 #include "cpcihp_zt5550.h"
  42
  43 #define DRIVER_VERSION  "0.2"
  44 #define DRIVER_AUTHOR   "Scott Murray <scottm@somanetworks.com>"
  45 #define DRIVER_DESC     "ZT5550 CompactPCI Hot Plug Driver"
  46
  47 #define MY_NAME "cpcihp_zt5550"
  48
  49 #define dbg(format, arg...)                                     \
  50         do {                                                    \
  51                 if (debug)                                      \
  52                         printk(KERN_DEBUG "%s: " format "\n",   \
  53                                 MY_NAME, ## arg);               \
  54         } while (0)
  55 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME, ## arg)
  56 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME, ## arg)
  57 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME, ## arg)
  58
  59 /* local variables */
  60 static bool debug;
  61 static bool poll;
  62 static struct cpci_hp_controller_ops zt5550_hpc_ops;
  63 static struct cpci_hp_controller zt5550_hpc;
  64
  65 /* Primary cPCI bus bridge device */
  66 static struct pci_dev *bus0_dev;
  67 static struct pci_bus *bus0;
  68
  69 /* Host controller device */
  70 static struct pci_dev *hc_dev;
  71
  72 /* Host controller register addresses */
  73 static void __iomem *hc_registers;
  74 static void __iomem *csr_hc_index;
  75 static void __iomem *csr_hc_data;
  76 static void __iomem *csr_int_status;
  77 static void __iomem *csr_int_mask;
  78
  79
  80 static int zt5550_hc_config(struct pci_dev *pdev)
  81 {
  82         int ret;
  83
  84         /* Since we know that no boards exist with two HC chips, treat it as an error */
  85         if (hc_dev) {
  86                 err("too many host controller devices?");
  87                 return -EBUSY;
  88         }
  89
  90         ret = pci_enable_device(pdev);
  91         if (ret) {
  92                 err("cannot enable %s\n", pci_name(pdev));
  93                 return ret;
  94         }
  95
  96         hc_dev = pdev;
  97         dbg("hc_dev = %p", hc_dev);
  98         dbg("pci resource start %llx", (unsigned long long)pci_resource_start(hc_dev, 1));
  99         dbg("pci resource len %llx", (unsigned long long)pci_resource_len(hc_dev, 1));
 100
 101         if (!request_mem_region(pci_resource_start(hc_dev, 1),
 102                                 pci_resource_len(hc_dev, 1), MY_NAME)) {
 103                 err("cannot reserve MMIO region");
 104                 ret = -ENOMEM;
 105                 goto exit_disable_device;
 106         }
 107
 108         hc_registers =
 109             ioremap(pci_resource_start(hc_dev, 1), pci_resource_len(hc_dev, 1));
 110         if (!hc_registers) {
 111                 err("cannot remap MMIO region %llx @ %llx",
 112                         (unsigned long long)pci_resource_len(hc_dev, 1),
 113                         (unsigned long long)pci_resource_start(hc_dev, 1));
 114                 ret = -ENODEV;
 115                 goto exit_release_region;
 116         }
 117
 118         csr_hc_index = hc_registers + CSR_HCINDEX;
 119         csr_hc_data = hc_registers + CSR_HCDATA;
 120         csr_int_status = hc_registers + CSR_INTSTAT;
 121         csr_int_mask = hc_registers + CSR_INTMASK;
 122
 123         /*
 124          * Disable host control, fault and serial interrupts
 125          */
 126         dbg("disabling host control, fault and serial interrupts");
 127         writeb((u8) HC_INT_MASK_REG, csr_hc_index);
 128         writeb((u8) ALL_INDEXED_INTS_MASK, csr_hc_data);
 129         dbg("disabled host control, fault and serial interrupts");
 130
 131         /*
 132          * Disable timer0, timer1 and ENUM interrupts
 133          */
 134         dbg("disabling timer0, timer1 and ENUM interrupts");
 135         writeb((u8) ALL_DIRECT_INTS_MASK, csr_int_mask);
 136         dbg("disabled timer0, timer1 and ENUM interrupts");
 137         return 0;
 138
 139 exit_release_region:
 140         release_mem_region(pci_resource_start(hc_dev, 1),
 141                            pci_resource_len(hc_dev, 1));
 142 exit_disable_device:
 143         pci_disable_device(hc_dev);
 144         return ret;
 145 }
 146
 147 static int zt5550_hc_cleanup(void)
 148 {
 149         if (!hc_dev)
 150                 return -ENODEV;
 151
 152         iounmap(hc_registers);
 153         release_mem_region(pci_resource_start(hc_dev, 1),
 154                            pci_resource_len(hc_dev, 1));
 155         pci_disable_device(hc_dev);
 156         return 0;
 157 }
 158
 159 static int zt5550_hc_query_enum(void)
 160 {
 161         u8 value;
 162
 163         value = inb_p(ENUM_PORT);
 164         return ((value & ENUM_MASK) == ENUM_MASK);
 165 }
 166
 167 static int zt5550_hc_check_irq(void *dev_id)
 168 {
 169         int ret;
 170         u8 reg;
 171
 172         ret = 0;
 173         if (dev_id == zt5550_hpc.dev_id) {
 174                 reg = readb(csr_int_status);
 175                 if (reg)
 176                         ret = 1;
 177         }
 178         return ret;
 179 }
 180
 181 static int zt5550_hc_enable_irq(void)
 182 {
 183         u8 reg;
 184
 185         if (hc_dev == NULL)
 186                 return -ENODEV;
 187
 188         reg = readb(csr_int_mask);
 189         reg = reg & ~ENUM_INT_MASK;
 190         writeb(reg, csr_int_mask);
 191         return 0;
 192 }
 193
 194 static int zt5550_hc_disable_irq(void)
 195 {
 196         u8 reg;
 197
 198         if (hc_dev == NULL)
 199                 return -ENODEV;
 200
 201         reg = readb(csr_int_mask);
 202         reg = reg | ENUM_INT_MASK;
 203         writeb(reg, csr_int_mask);
 204         return 0;
 205 }
 206
 207 static int zt5550_hc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 208 {
 209         int status;
 210
 211         status = zt5550_hc_config(pdev);
 212         if (status != 0)
 213                 return status;
 214
 215         dbg("returned from zt5550_hc_config");
 216
 217         memset(&zt5550_hpc, 0, sizeof(struct cpci_hp_controller));
 218         zt5550_hpc_ops.query_enum = zt5550_hc_query_enum;
 219         zt5550_hpc.ops = &zt5550_hpc_ops;
 220         if (!poll) {
 221                 zt5550_hpc.irq = hc_dev->irq;
 222                 zt5550_hpc.irq_flags = IRQF_SHARED;
 223                 zt5550_hpc.dev_id = hc_dev;
 224
 225                 zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq;
 226                 zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq;
 227                 zt5550_hpc_ops.check_irq = zt5550_hc_check_irq;
 228         } else {
 229                 info("using ENUM# polling mode");
 230         }
 231
 232         status = cpci_hp_register_controller(&zt5550_hpc);
 233         if (status != 0) {
 234                 err("could not register cPCI hotplug controller");
 235                 goto init_hc_error;
 236         }
 237         dbg("registered controller");
 238
 239         /* Look for first device matching cPCI bus's bridge vendor and device IDs */
 240         bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
 241                                   PCI_DEVICE_ID_DEC_21154, NULL);
 242         if (!bus0_dev) {
 243                 status = -ENODEV;
 244                 goto init_register_error;
 245         }
 246         bus0 = bus0_dev->subordinate;
 247         pci_dev_put(bus0_dev);
 248
 249         status = cpci_hp_register_bus(bus0, 0x0a, 0x0f);
 250         if (status != 0) {
 251                 err("could not register cPCI hotplug bus");
 252                 goto init_register_error;
 253         }
 254         dbg("registered bus");
 255
 256         status = cpci_hp_start();
 257         if (status != 0) {
 258                 err("could not started cPCI hotplug system");
 259                 cpci_hp_unregister_bus(bus0);
 260                 goto init_register_error;
 261         }
 262         dbg("started cpci hp system");
 263
 264         return 0;
 265 init_register_error:
 266         cpci_hp_unregister_controller(&zt5550_hpc);
 267 init_hc_error:
 268         err("status = %d", status);
 269         zt5550_hc_cleanup();
 270         return status;
 271
 272 }
 273
 274 static void zt5550_hc_remove_one(struct pci_dev *pdev)
 275 {
 276         cpci_hp_stop();
 277         cpci_hp_unregister_bus(bus0);
 278         cpci_hp_unregister_controller(&zt5550_hpc);
 279         zt5550_hc_cleanup();
 280 }
 281
 282
 283 static struct pci_device_id zt5550_hc_pci_tbl[] = {
 284         { PCI_VENDOR_ID_ZIATECH, PCI_DEVICE_ID_ZIATECH_5550_HC, PCI_ANY_ID, PCI_ANY_ID, },
 285         { 0, }
 286 };
 287 MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl);
 288
 289 static struct pci_driver zt5550_hc_driver = {
 290         .name           = "zt5550_hc",
 291         .id_table       = zt5550_hc_pci_tbl,
 292         .probe          = zt5550_hc_init_one,
 293         .remove         = zt5550_hc_remove_one,
 294 };
 295
 296 static int __init zt5550_init(void)
 297 {
 298         struct resource *r;
 299         int rc;
 300
 301         info(DRIVER_DESC " version: " DRIVER_VERSION);
 302         r = request_region(ENUM_PORT, 1, "#ENUM hotswap signal register");
 303         if (!r)
 304                 return -EBUSY;
 305
 306         rc = pci_register_driver(&zt5550_hc_driver);
 307         if (rc < 0)
 308                 release_region(ENUM_PORT, 1);
 309         return rc;
 310 }
 311
 312 static void __exit
 313 zt5550_exit(void)
 314 {
 315         pci_unregister_driver(&zt5550_hc_driver);
 316         release_region(ENUM_PORT, 1);
 317 }
 318
 319 module_init(zt5550_init);
 320 module_exit(zt5550_exit);
 321
 322 MODULE_AUTHOR(DRIVER_AUTHOR);
 323 MODULE_DESCRIPTION(DRIVER_DESC);
 324 MODULE_LICENSE("GPL");
 325 module_param(debug, bool, 0644);
 326 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
 327 module_param(poll, bool, 0644);
 328 MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not");