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1/*
2 * cb710/core.c
3 *
4 * Copyright by Michał Mirosław, 2008-2009
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/pci.h>
13#include <linux/spinlock.h>
14#include <linux/idr.h>
15#include <linux/cb710.h>
16#include <linux/gfp.h>
17
18static DEFINE_IDA(cb710_ida);
19static DEFINE_SPINLOCK(cb710_ida_lock);
20
21void cb710_pci_update_config_reg(struct pci_dev *pdev,
22 int reg, uint32_t mask, uint32_t xor)
23{
24 u32 rval;
25
26 pci_read_config_dword(pdev, reg, &rval);
27 rval = (rval & mask) ^ xor;
28 pci_write_config_dword(pdev, reg, rval);
29}
30EXPORT_SYMBOL_GPL(cb710_pci_update_config_reg);
31
32/* Some magic writes based on Windows driver init code */
33static int __devinit cb710_pci_configure(struct pci_dev *pdev)
34{
35 unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
36 struct pci_dev *pdev0;
37 u32 val;
38
39 cb710_pci_update_config_reg(pdev, 0x48,
40 ~0x000000FF, 0x0000003F);
41
42 pci_read_config_dword(pdev, 0x48, &val);
43 if (val & 0x80000000)
44 return 0;
45
46 pdev0 = pci_get_slot(pdev->bus, devfn);
47 if (!pdev0)
48 return -ENODEV;
49
50 if (pdev0->vendor == PCI_VENDOR_ID_ENE
51 && pdev0->device == PCI_DEVICE_ID_ENE_720) {
52 cb710_pci_update_config_reg(pdev0, 0x8C,
53 ~0x00F00000, 0x00100000);
54 cb710_pci_update_config_reg(pdev0, 0xB0,
55 ~0x08000000, 0x08000000);
56 }
57
58 cb710_pci_update_config_reg(pdev0, 0x8C,
59 ~0x00000F00, 0x00000200);
60 cb710_pci_update_config_reg(pdev0, 0x90,
61 ~0x00060000, 0x00040000);
62
63 pci_dev_put(pdev0);
64
65 return 0;
66}
67
68static irqreturn_t cb710_irq_handler(int irq, void *data)
69{
70 struct cb710_chip *chip = data;
71 struct cb710_slot *slot = &chip->slot[0];
72 irqreturn_t handled = IRQ_NONE;
73 unsigned nr;
74
75 spin_lock(&chip->irq_lock); /* incl. smp_rmb() */
76
77 for (nr = chip->slots; nr; ++slot, --nr) {
78 cb710_irq_handler_t handler_func = slot->irq_handler;
79 if (handler_func && handler_func(slot))
80 handled = IRQ_HANDLED;
81 }
82
83 spin_unlock(&chip->irq_lock);
84
85 return handled;
86}
87
88static void cb710_release_slot(struct device *dev)
89{
90#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
91 struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev));
92 struct cb710_chip *chip = cb710_slot_to_chip(slot);
93
94 /* slot struct can be freed now */
95 atomic_dec(&chip->slot_refs_count);
96#endif
97}
98
99static int __devinit cb710_register_slot(struct cb710_chip *chip,
100 unsigned slot_mask, unsigned io_offset, const char *name)
101{
102 int nr = chip->slots;
103 struct cb710_slot *slot = &chip->slot[nr];
104 int err;
105
106 dev_dbg(cb710_chip_dev(chip),
107 "register: %s.%d; slot %d; mask %d; IO offset: 0x%02X\n",
108 name, chip->platform_id, nr, slot_mask, io_offset);
109
110 /* slot->irq_handler == NULL here; this needs to be
111 * seen before platform_device_register() */
112 ++chip->slots;
113 smp_wmb();
114
115 slot->iobase = chip->iobase + io_offset;
116 slot->pdev.name = name;
117 slot->pdev.id = chip->platform_id;
118 slot->pdev.dev.parent = &chip->pdev->dev;
119 slot->pdev.dev.release = cb710_release_slot;
120
121 err = platform_device_register(&slot->pdev);
122
123#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
124 atomic_inc(&chip->slot_refs_count);
125#endif
126
127 if (err) {
128 /* device_initialize() called from platform_device_register()
129 * wants this on error path */
130 platform_device_put(&slot->pdev);
131
132 /* slot->irq_handler == NULL here anyway, so no lock needed */
133 --chip->slots;
134 return err;
135 }
136
137 chip->slot_mask |= slot_mask;
138
139 return 0;
140}
141
142static void cb710_unregister_slot(struct cb710_chip *chip,
143 unsigned slot_mask)
144{
145 int nr = chip->slots - 1;
146
147 if (!(chip->slot_mask & slot_mask))
148 return;
149
150 platform_device_unregister(&chip->slot[nr].pdev);
151
152 /* complementary to spin_unlock() in cb710_set_irq_handler() */
153 smp_rmb();
154 BUG_ON(chip->slot[nr].irq_handler != NULL);
155
156 /* slot->irq_handler == NULL here, so no lock needed */
157 --chip->slots;
158 chip->slot_mask &= ~slot_mask;
159}
160
161void cb710_set_irq_handler(struct cb710_slot *slot,
162 cb710_irq_handler_t handler)
163{
164 struct cb710_chip *chip = cb710_slot_to_chip(slot);
165 unsigned long flags;
166
167 spin_lock_irqsave(&chip->irq_lock, flags);
168 slot->irq_handler = handler;
169 spin_unlock_irqrestore(&chip->irq_lock, flags);
170}
171EXPORT_SYMBOL_GPL(cb710_set_irq_handler);
172
173#ifdef CONFIG_PM
174
175static int cb710_suspend(struct pci_dev *pdev, pm_message_t state)
176{
177 struct cb710_chip *chip = pci_get_drvdata(pdev);
178
179 free_irq(pdev->irq, chip);
180 pci_save_state(pdev);
181 pci_disable_device(pdev);
182 if (state.event & PM_EVENT_SLEEP)
183 pci_set_power_state(pdev, PCI_D3cold);
184 return 0;
185}
186
187static int cb710_resume(struct pci_dev *pdev)
188{
189 struct cb710_chip *chip = pci_get_drvdata(pdev);
190 int err;
191
192 pci_set_power_state(pdev, PCI_D0);
193 pci_restore_state(pdev);
194 err = pcim_enable_device(pdev);
195 if (err)
196 return err;
197
198 return devm_request_irq(&pdev->dev, pdev->irq,
199 cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
200}
201
202#endif /* CONFIG_PM */
203
204static int __devinit cb710_probe(struct pci_dev *pdev,
205 const struct pci_device_id *ent)
206{
207 struct cb710_chip *chip;
208 unsigned long flags;
209 u32 val;
210 int err;
211 int n = 0;
212
213 err = cb710_pci_configure(pdev);
214 if (err)
215 return err;
216
217 /* this is actually magic... */
218 pci_read_config_dword(pdev, 0x48, &val);
219 if (!(val & 0x80000000)) {
220 pci_write_config_dword(pdev, 0x48, val|0x71000000);
221 pci_read_config_dword(pdev, 0x48, &val);
222 }
223
224 dev_dbg(&pdev->dev, "PCI config[0x48] = 0x%08X\n", val);
225 if (!(val & 0x70000000))
226 return -ENODEV;
227 val = (val >> 28) & 7;
228 if (val & CB710_SLOT_MMC)
229 ++n;
230 if (val & CB710_SLOT_MS)
231 ++n;
232 if (val & CB710_SLOT_SM)
233 ++n;
234
235 chip = devm_kzalloc(&pdev->dev,
236 sizeof(*chip) + n * sizeof(*chip->slot), GFP_KERNEL);
237 if (!chip)
238 return -ENOMEM;
239
240 err = pcim_enable_device(pdev);
241 if (err)
242 return err;
243
244 err = pcim_iomap_regions(pdev, 0x0001, KBUILD_MODNAME);
245 if (err)
246 return err;
247
248 chip->pdev = pdev;
249 chip->iobase = pcim_iomap_table(pdev)[0];
250
251 pci_set_drvdata(pdev, chip);
252
253 err = devm_request_irq(&pdev->dev, pdev->irq,
254 cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
255 if (err)
256 return err;
257
258 do {
259 if (!ida_pre_get(&cb710_ida, GFP_KERNEL))
260 return -ENOMEM;
261
262 spin_lock_irqsave(&cb710_ida_lock, flags);
263 err = ida_get_new(&cb710_ida, &chip->platform_id);
264 spin_unlock_irqrestore(&cb710_ida_lock, flags);
265
266 if (err && err != -EAGAIN)
267 return err;
268 } while (err);
269
270
271 dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
272 chip->platform_id, chip->iobase, pdev->irq);
273
274 if (val & CB710_SLOT_MMC) { /* MMC/SD slot */
275 err = cb710_register_slot(chip,
276 CB710_SLOT_MMC, 0x00, "cb710-mmc");
277 if (err)
278 return err;
279 }
280
281 if (val & CB710_SLOT_MS) { /* MemoryStick slot */
282 err = cb710_register_slot(chip,
283 CB710_SLOT_MS, 0x40, "cb710-ms");
284 if (err)
285 goto unreg_mmc;
286 }
287
288 if (val & CB710_SLOT_SM) { /* SmartMedia slot */
289 err = cb710_register_slot(chip,
290 CB710_SLOT_SM, 0x60, "cb710-sm");
291 if (err)
292 goto unreg_ms;
293 }
294
295 return 0;
296unreg_ms:
297 cb710_unregister_slot(chip, CB710_SLOT_MS);
298unreg_mmc:
299 cb710_unregister_slot(chip, CB710_SLOT_MMC);
300
301#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
302 BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
303#endif
304 return err;
305}
306
307static void __devexit cb710_remove_one(struct pci_dev *pdev)
308{
309 struct cb710_chip *chip = pci_get_drvdata(pdev);
310 unsigned long flags;
311
312 cb710_unregister_slot(chip, CB710_SLOT_SM);
313 cb710_unregister_slot(chip, CB710_SLOT_MS);
314 cb710_unregister_slot(chip, CB710_SLOT_MMC);
315#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
316 BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
317#endif
318
319 spin_lock_irqsave(&cb710_ida_lock, flags);
320 ida_remove(&cb710_ida, chip->platform_id);
321 spin_unlock_irqrestore(&cb710_ida_lock, flags);
322}
323
324static const struct pci_device_id cb710_pci_tbl[] = {
325 { PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH,
326 PCI_ANY_ID, PCI_ANY_ID, },
327 { 0, }
328};
329
330static struct pci_driver cb710_driver = {
331 .name = KBUILD_MODNAME,
332 .id_table = cb710_pci_tbl,
333 .probe = cb710_probe,
334 .remove = __devexit_p(cb710_remove_one),
335#ifdef CONFIG_PM
336 .suspend = cb710_suspend,
337 .resume = cb710_resume,
338#endif
339};
340
341static int __init cb710_init_module(void)
342{
343 return pci_register_driver(&cb710_driver);
344}
345
346static void __exit cb710_cleanup_module(void)
347{
348 pci_unregister_driver(&cb710_driver);
349 ida_destroy(&cb710_ida);
350}
351
352module_init(cb710_init_module);
353module_exit(cb710_cleanup_module);
354
355MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
356MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
357MODULE_LICENSE("GPL");
358MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * cb710/core.c
4 *
5 * Copyright by Michał Mirosław, 2008-2009
6 */
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/pci.h>
10#include <linux/spinlock.h>
11#include <linux/idr.h>
12#include <linux/cb710.h>
13#include <linux/gfp.h>
14
15static DEFINE_IDA(cb710_ida);
16
17void cb710_pci_update_config_reg(struct pci_dev *pdev,
18 int reg, uint32_t mask, uint32_t xor)
19{
20 u32 rval;
21
22 pci_read_config_dword(pdev, reg, &rval);
23 rval = (rval & mask) ^ xor;
24 pci_write_config_dword(pdev, reg, rval);
25}
26EXPORT_SYMBOL_GPL(cb710_pci_update_config_reg);
27
28/* Some magic writes based on Windows driver init code */
29static int cb710_pci_configure(struct pci_dev *pdev)
30{
31 unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
32 struct pci_dev *pdev0;
33 u32 val;
34
35 cb710_pci_update_config_reg(pdev, 0x48,
36 ~0x000000FF, 0x0000003F);
37
38 pci_read_config_dword(pdev, 0x48, &val);
39 if (val & 0x80000000)
40 return 0;
41
42 pdev0 = pci_get_slot(pdev->bus, devfn);
43 if (!pdev0)
44 return -ENODEV;
45
46 if (pdev0->vendor == PCI_VENDOR_ID_ENE
47 && pdev0->device == PCI_DEVICE_ID_ENE_720) {
48 cb710_pci_update_config_reg(pdev0, 0x8C,
49 ~0x00F00000, 0x00100000);
50 cb710_pci_update_config_reg(pdev0, 0xB0,
51 ~0x08000000, 0x08000000);
52 }
53
54 cb710_pci_update_config_reg(pdev0, 0x8C,
55 ~0x00000F00, 0x00000200);
56 cb710_pci_update_config_reg(pdev0, 0x90,
57 ~0x00060000, 0x00040000);
58
59 pci_dev_put(pdev0);
60
61 return 0;
62}
63
64static irqreturn_t cb710_irq_handler(int irq, void *data)
65{
66 struct cb710_chip *chip = data;
67 struct cb710_slot *slot = &chip->slot[0];
68 irqreturn_t handled = IRQ_NONE;
69 unsigned nr;
70
71 spin_lock(&chip->irq_lock); /* incl. smp_rmb() */
72
73 for (nr = chip->slots; nr; ++slot, --nr) {
74 cb710_irq_handler_t handler_func = slot->irq_handler;
75 if (handler_func && handler_func(slot))
76 handled = IRQ_HANDLED;
77 }
78
79 spin_unlock(&chip->irq_lock);
80
81 return handled;
82}
83
84static void cb710_release_slot(struct device *dev)
85{
86#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
87 struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev));
88 struct cb710_chip *chip = cb710_slot_to_chip(slot);
89
90 /* slot struct can be freed now */
91 atomic_dec(&chip->slot_refs_count);
92#endif
93}
94
95static int cb710_register_slot(struct cb710_chip *chip,
96 unsigned slot_mask, unsigned io_offset, const char *name)
97{
98 int nr = chip->slots;
99 struct cb710_slot *slot = &chip->slot[nr];
100 int err;
101
102 dev_dbg(cb710_chip_dev(chip),
103 "register: %s.%d; slot %d; mask %d; IO offset: 0x%02X\n",
104 name, chip->platform_id, nr, slot_mask, io_offset);
105
106 /* slot->irq_handler == NULL here; this needs to be
107 * seen before platform_device_register() */
108 ++chip->slots;
109 smp_wmb();
110
111 slot->iobase = chip->iobase + io_offset;
112 slot->pdev.name = name;
113 slot->pdev.id = chip->platform_id;
114 slot->pdev.dev.parent = &chip->pdev->dev;
115 slot->pdev.dev.release = cb710_release_slot;
116
117 err = platform_device_register(&slot->pdev);
118
119#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
120 atomic_inc(&chip->slot_refs_count);
121#endif
122
123 if (err) {
124 /* device_initialize() called from platform_device_register()
125 * wants this on error path */
126 platform_device_put(&slot->pdev);
127
128 /* slot->irq_handler == NULL here anyway, so no lock needed */
129 --chip->slots;
130 return err;
131 }
132
133 chip->slot_mask |= slot_mask;
134
135 return 0;
136}
137
138static void cb710_unregister_slot(struct cb710_chip *chip,
139 unsigned slot_mask)
140{
141 int nr = chip->slots - 1;
142
143 if (!(chip->slot_mask & slot_mask))
144 return;
145
146 platform_device_unregister(&chip->slot[nr].pdev);
147
148 /* complementary to spin_unlock() in cb710_set_irq_handler() */
149 smp_rmb();
150 BUG_ON(chip->slot[nr].irq_handler != NULL);
151
152 /* slot->irq_handler == NULL here, so no lock needed */
153 --chip->slots;
154 chip->slot_mask &= ~slot_mask;
155}
156
157void cb710_set_irq_handler(struct cb710_slot *slot,
158 cb710_irq_handler_t handler)
159{
160 struct cb710_chip *chip = cb710_slot_to_chip(slot);
161 unsigned long flags;
162
163 spin_lock_irqsave(&chip->irq_lock, flags);
164 slot->irq_handler = handler;
165 spin_unlock_irqrestore(&chip->irq_lock, flags);
166}
167EXPORT_SYMBOL_GPL(cb710_set_irq_handler);
168
169static int __maybe_unused cb710_suspend(struct device *dev_d)
170{
171 struct pci_dev *pdev = to_pci_dev(dev_d);
172 struct cb710_chip *chip = pci_get_drvdata(pdev);
173
174 devm_free_irq(&pdev->dev, pdev->irq, chip);
175 return 0;
176}
177
178static int __maybe_unused cb710_resume(struct device *dev_d)
179{
180 struct pci_dev *pdev = to_pci_dev(dev_d);
181 struct cb710_chip *chip = pci_get_drvdata(pdev);
182
183 return devm_request_irq(&pdev->dev, pdev->irq,
184 cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
185}
186
187static int cb710_probe(struct pci_dev *pdev,
188 const struct pci_device_id *ent)
189{
190 struct cb710_chip *chip;
191 u32 val;
192 int err;
193 int n = 0;
194
195 err = cb710_pci_configure(pdev);
196 if (err)
197 return err;
198
199 /* this is actually magic... */
200 pci_read_config_dword(pdev, 0x48, &val);
201 if (!(val & 0x80000000)) {
202 pci_write_config_dword(pdev, 0x48, val|0x71000000);
203 pci_read_config_dword(pdev, 0x48, &val);
204 }
205
206 dev_dbg(&pdev->dev, "PCI config[0x48] = 0x%08X\n", val);
207 if (!(val & 0x70000000))
208 return -ENODEV;
209 val = (val >> 28) & 7;
210 if (val & CB710_SLOT_MMC)
211 ++n;
212 if (val & CB710_SLOT_MS)
213 ++n;
214 if (val & CB710_SLOT_SM)
215 ++n;
216
217 chip = devm_kzalloc(&pdev->dev, struct_size(chip, slot, n),
218 GFP_KERNEL);
219 if (!chip)
220 return -ENOMEM;
221
222 err = pcim_enable_device(pdev);
223 if (err)
224 return err;
225
226 err = pcim_iomap_regions(pdev, 0x0001, KBUILD_MODNAME);
227 if (err)
228 return err;
229
230 spin_lock_init(&chip->irq_lock);
231 chip->pdev = pdev;
232 chip->iobase = pcim_iomap_table(pdev)[0];
233
234 pci_set_drvdata(pdev, chip);
235
236 err = devm_request_irq(&pdev->dev, pdev->irq,
237 cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
238 if (err)
239 return err;
240
241 err = ida_alloc(&cb710_ida, GFP_KERNEL);
242 if (err < 0)
243 return err;
244 chip->platform_id = err;
245
246 dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
247 chip->platform_id, chip->iobase, pdev->irq);
248
249 if (val & CB710_SLOT_MMC) { /* MMC/SD slot */
250 err = cb710_register_slot(chip,
251 CB710_SLOT_MMC, 0x00, "cb710-mmc");
252 if (err)
253 return err;
254 }
255
256 if (val & CB710_SLOT_MS) { /* MemoryStick slot */
257 err = cb710_register_slot(chip,
258 CB710_SLOT_MS, 0x40, "cb710-ms");
259 if (err)
260 goto unreg_mmc;
261 }
262
263 if (val & CB710_SLOT_SM) { /* SmartMedia slot */
264 err = cb710_register_slot(chip,
265 CB710_SLOT_SM, 0x60, "cb710-sm");
266 if (err)
267 goto unreg_ms;
268 }
269
270 return 0;
271unreg_ms:
272 cb710_unregister_slot(chip, CB710_SLOT_MS);
273unreg_mmc:
274 cb710_unregister_slot(chip, CB710_SLOT_MMC);
275
276#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
277 BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
278#endif
279 return err;
280}
281
282static void cb710_remove_one(struct pci_dev *pdev)
283{
284 struct cb710_chip *chip = pci_get_drvdata(pdev);
285
286 cb710_unregister_slot(chip, CB710_SLOT_SM);
287 cb710_unregister_slot(chip, CB710_SLOT_MS);
288 cb710_unregister_slot(chip, CB710_SLOT_MMC);
289#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
290 BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
291#endif
292
293 ida_free(&cb710_ida, chip->platform_id);
294}
295
296static const struct pci_device_id cb710_pci_tbl[] = {
297 { PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH,
298 PCI_ANY_ID, PCI_ANY_ID, },
299 { 0, }
300};
301
302static SIMPLE_DEV_PM_OPS(cb710_pm_ops, cb710_suspend, cb710_resume);
303
304static struct pci_driver cb710_driver = {
305 .name = KBUILD_MODNAME,
306 .id_table = cb710_pci_tbl,
307 .probe = cb710_probe,
308 .remove = cb710_remove_one,
309 .driver.pm = &cb710_pm_ops,
310};
311
312static int __init cb710_init_module(void)
313{
314 return pci_register_driver(&cb710_driver);
315}
316
317static void __exit cb710_cleanup_module(void)
318{
319 pci_unregister_driver(&cb710_driver);
320 ida_destroy(&cb710_ida);
321}
322
323module_init(cb710_init_module);
324module_exit(cb710_cleanup_module);
325
326MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>");
327MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
328MODULE_LICENSE("GPL");
329MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);