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Linux/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 
202         reg = readb(csr_int_mask);
203         reg = reg | ENUM_INT_MASK;
204         writeb(reg, csr_int_mask);
205         return 0;
206 }
207 
208 static int zt5550_hc_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
209 {
210         int status;
211 
212         status = zt5550_hc_config(pdev);
213         if(status != 0) {
214                 return status;
215         }
216         dbg("returned from zt5550_hc_config");
217 
218         memset(&zt5550_hpc, 0, sizeof (struct cpci_hp_controller));
219         zt5550_hpc_ops.query_enum = zt5550_hc_query_enum;
220         zt5550_hpc.ops = &zt5550_hpc_ops;
221         if(!poll) {
222                 zt5550_hpc.irq = hc_dev->irq;
223                 zt5550_hpc.irq_flags = IRQF_SHARED;
224                 zt5550_hpc.dev_id = hc_dev;
225 
226                 zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq;
227                 zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq;
228                 zt5550_hpc_ops.check_irq = zt5550_hc_check_irq;
229         } else {
230                 info("using ENUM# polling mode");
231         }
232 
233         status = cpci_hp_register_controller(&zt5550_hpc);
234         if(status != 0) {
235                 err("could not register cPCI hotplug controller");
236                 goto init_hc_error;
237         }
238         dbg("registered controller");
239 
240         /* Look for first device matching cPCI bus's bridge vendor and device IDs */
241         if(!(bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
242                                          PCI_DEVICE_ID_DEC_21154, NULL))) {
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");
329 

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