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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 */
60static int debug;
61static int poll;
62static struct cpci_hp_controller_ops zt5550_hpc_ops;
63static struct cpci_hp_controller zt5550_hpc;
64
65/* Primary cPCI bus bridge device */
66static struct pci_dev *bus0_dev;
67static struct pci_bus *bus0;
68
69/* Host controller device */
70static struct pci_dev *hc_dev;
71
72/* Host controller register addresses */
73static void __iomem *hc_registers;
74static void __iomem *csr_hc_index;
75static void __iomem *csr_hc_data;
76static void __iomem *csr_int_status;
77static void __iomem *csr_int_mask;
78
79
80static 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
139exit_release_region:
140 release_mem_region(pci_resource_start(hc_dev, 1),
141 pci_resource_len(hc_dev, 1));
142exit_disable_device:
143 pci_disable_device(hc_dev);
144 return ret;
145}
146
147static 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
159static 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
167static 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
181static 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
194static 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
208static 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;
265init_register_error:
266 cpci_hp_unregister_controller(&zt5550_hpc);
267init_hc_error:
268 err("status = %d", status);
269 zt5550_hc_cleanup();
270 return status;
271
272}
273
274static void __devexit 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
283static 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};
287MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl);
288
289static 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 = __devexit_p(zt5550_hc_remove_one),
294};
295
296static 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
312static void __exit
313zt5550_exit(void)
314{
315 pci_unregister_driver(&zt5550_hc_driver);
316 release_region(ENUM_PORT, 1);
317}
318
319module_init(zt5550_init);
320module_exit(zt5550_exit);
321
322MODULE_AUTHOR(DRIVER_AUTHOR);
323MODULE_DESCRIPTION(DRIVER_DESC);
324MODULE_LICENSE("GPL");
325module_param(debug, bool, 0644);
326MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
327module_param(poll, bool, 0644);
328MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * cpcihp_zt5550.c
4 *
5 * Intel/Ziatech ZT5550 CompactPCI Host Controller driver
6 *
7 * Copyright 2002 SOMA Networks, Inc.
8 * Copyright 2001 Intel San Luis Obispo
9 * Copyright 2000,2001 MontaVista Software Inc.
10 *
11 * Send feedback to <scottm@somanetworks.com>
12 */
13
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/init.h>
17#include <linux/errno.h>
18#include <linux/pci.h>
19#include <linux/interrupt.h>
20#include <linux/signal.h> /* IRQF_SHARED */
21#include "cpci_hotplug.h"
22#include "cpcihp_zt5550.h"
23
24#define DRIVER_VERSION "0.2"
25#define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
26#define DRIVER_DESC "ZT5550 CompactPCI Hot Plug Driver"
27
28#define MY_NAME "cpcihp_zt5550"
29
30#define dbg(format, arg...) \
31 do { \
32 if (debug) \
33 printk(KERN_DEBUG "%s: " format "\n", \
34 MY_NAME, ## arg); \
35 } while (0)
36#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME, ## arg)
37#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME, ## arg)
38#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME, ## arg)
39
40/* local variables */
41static bool debug;
42static bool poll;
43static struct cpci_hp_controller_ops zt5550_hpc_ops;
44static struct cpci_hp_controller zt5550_hpc;
45
46/* Primary cPCI bus bridge device */
47static struct pci_dev *bus0_dev;
48static struct pci_bus *bus0;
49
50/* Host controller device */
51static struct pci_dev *hc_dev;
52
53/* Host controller register addresses */
54static void __iomem *hc_registers;
55static void __iomem *csr_hc_index;
56static void __iomem *csr_hc_data;
57static void __iomem *csr_int_status;
58static void __iomem *csr_int_mask;
59
60
61static int zt5550_hc_config(struct pci_dev *pdev)
62{
63 int ret;
64
65 /* Since we know that no boards exist with two HC chips, treat it as an error */
66 if (hc_dev) {
67 err("too many host controller devices?");
68 return -EBUSY;
69 }
70
71 ret = pci_enable_device(pdev);
72 if (ret) {
73 err("cannot enable %s\n", pci_name(pdev));
74 return ret;
75 }
76
77 hc_dev = pdev;
78 dbg("hc_dev = %p", hc_dev);
79 dbg("pci resource start %llx", (unsigned long long)pci_resource_start(hc_dev, 1));
80 dbg("pci resource len %llx", (unsigned long long)pci_resource_len(hc_dev, 1));
81
82 if (!request_mem_region(pci_resource_start(hc_dev, 1),
83 pci_resource_len(hc_dev, 1), MY_NAME)) {
84 err("cannot reserve MMIO region");
85 ret = -ENOMEM;
86 goto exit_disable_device;
87 }
88
89 hc_registers =
90 ioremap(pci_resource_start(hc_dev, 1), pci_resource_len(hc_dev, 1));
91 if (!hc_registers) {
92 err("cannot remap MMIO region %llx @ %llx",
93 (unsigned long long)pci_resource_len(hc_dev, 1),
94 (unsigned long long)pci_resource_start(hc_dev, 1));
95 ret = -ENODEV;
96 goto exit_release_region;
97 }
98
99 csr_hc_index = hc_registers + CSR_HCINDEX;
100 csr_hc_data = hc_registers + CSR_HCDATA;
101 csr_int_status = hc_registers + CSR_INTSTAT;
102 csr_int_mask = hc_registers + CSR_INTMASK;
103
104 /*
105 * Disable host control, fault and serial interrupts
106 */
107 dbg("disabling host control, fault and serial interrupts");
108 writeb((u8) HC_INT_MASK_REG, csr_hc_index);
109 writeb((u8) ALL_INDEXED_INTS_MASK, csr_hc_data);
110 dbg("disabled host control, fault and serial interrupts");
111
112 /*
113 * Disable timer0, timer1 and ENUM interrupts
114 */
115 dbg("disabling timer0, timer1 and ENUM interrupts");
116 writeb((u8) ALL_DIRECT_INTS_MASK, csr_int_mask);
117 dbg("disabled timer0, timer1 and ENUM interrupts");
118 return 0;
119
120exit_release_region:
121 release_mem_region(pci_resource_start(hc_dev, 1),
122 pci_resource_len(hc_dev, 1));
123exit_disable_device:
124 pci_disable_device(hc_dev);
125 return ret;
126}
127
128static int zt5550_hc_cleanup(void)
129{
130 if (!hc_dev)
131 return -ENODEV;
132
133 iounmap(hc_registers);
134 release_mem_region(pci_resource_start(hc_dev, 1),
135 pci_resource_len(hc_dev, 1));
136 pci_disable_device(hc_dev);
137 return 0;
138}
139
140static 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
148static 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
162static 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
175static int zt5550_hc_disable_irq(void)
176{
177 u8 reg;
178
179 if (hc_dev == NULL)
180 return -ENODEV;
181
182 reg = readb(csr_int_mask);
183 reg = reg | ENUM_INT_MASK;
184 writeb(reg, csr_int_mask);
185 return 0;
186}
187
188static int zt5550_hc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
189{
190 int status;
191
192 status = zt5550_hc_config(pdev);
193 if (status != 0)
194 return status;
195
196 dbg("returned from zt5550_hc_config");
197
198 memset(&zt5550_hpc, 0, sizeof(struct cpci_hp_controller));
199 zt5550_hpc_ops.query_enum = zt5550_hc_query_enum;
200 zt5550_hpc.ops = &zt5550_hpc_ops;
201 if (!poll) {
202 zt5550_hpc.irq = hc_dev->irq;
203 zt5550_hpc.irq_flags = IRQF_SHARED;
204 zt5550_hpc.dev_id = hc_dev;
205
206 zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq;
207 zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq;
208 zt5550_hpc_ops.check_irq = zt5550_hc_check_irq;
209 } else {
210 info("using ENUM# polling mode");
211 }
212
213 status = cpci_hp_register_controller(&zt5550_hpc);
214 if (status != 0) {
215 err("could not register cPCI hotplug controller");
216 goto init_hc_error;
217 }
218 dbg("registered controller");
219
220 /* Look for first device matching cPCI bus's bridge vendor and device IDs */
221 bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
222 PCI_DEVICE_ID_DEC_21154, NULL);
223 if (!bus0_dev) {
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;
246init_register_error:
247 cpci_hp_unregister_controller(&zt5550_hpc);
248init_hc_error:
249 err("status = %d", status);
250 zt5550_hc_cleanup();
251 return status;
252
253}
254
255static void 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
264static const 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};
268MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl);
269
270static 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 = zt5550_hc_remove_one,
275};
276
277static int __init zt5550_init(void)
278{
279 struct resource *r;
280 int rc;
281
282 info(DRIVER_DESC " version: " DRIVER_VERSION);
283 r = request_region(ENUM_PORT, 1, "#ENUM hotswap signal register");
284 if (!r)
285 return -EBUSY;
286
287 rc = pci_register_driver(&zt5550_hc_driver);
288 if (rc < 0)
289 release_region(ENUM_PORT, 1);
290 return rc;
291}
292
293static void __exit
294zt5550_exit(void)
295{
296 pci_unregister_driver(&zt5550_hc_driver);
297 release_region(ENUM_PORT, 1);
298}
299
300module_init(zt5550_init);
301module_exit(zt5550_exit);
302
303MODULE_AUTHOR(DRIVER_AUTHOR);
304MODULE_DESCRIPTION(DRIVER_DESC);
305MODULE_LICENSE("GPL");
306module_param(debug, bool, 0644);
307MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
308module_param(poll, bool, 0644);
309MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not");