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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 spin_lock_init(&chip->irq_lock);
227 chip->pdev = pdev;
228 chip->iobase = pcim_iomap_region(pdev, 0, KBUILD_MODNAME);
229 if (IS_ERR(chip->iobase))
230 return PTR_ERR(chip->iobase);
231
232 pci_set_drvdata(pdev, chip);
233
234 err = devm_request_irq(&pdev->dev, pdev->irq,
235 cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip);
236 if (err)
237 return err;
238
239 err = ida_alloc(&cb710_ida, GFP_KERNEL);
240 if (err < 0)
241 return err;
242 chip->platform_id = err;
243
244 dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
245 chip->platform_id, chip->iobase, pdev->irq);
246
247 if (val & CB710_SLOT_MMC) { /* MMC/SD slot */
248 err = cb710_register_slot(chip,
249 CB710_SLOT_MMC, 0x00, "cb710-mmc");
250 if (err)
251 return err;
252 }
253
254 if (val & CB710_SLOT_MS) { /* MemoryStick slot */
255 err = cb710_register_slot(chip,
256 CB710_SLOT_MS, 0x40, "cb710-ms");
257 if (err)
258 goto unreg_mmc;
259 }
260
261 if (val & CB710_SLOT_SM) { /* SmartMedia slot */
262 err = cb710_register_slot(chip,
263 CB710_SLOT_SM, 0x60, "cb710-sm");
264 if (err)
265 goto unreg_ms;
266 }
267
268 return 0;
269unreg_ms:
270 cb710_unregister_slot(chip, CB710_SLOT_MS);
271unreg_mmc:
272 cb710_unregister_slot(chip, CB710_SLOT_MMC);
273
274#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
275 BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
276#endif
277 return err;
278}
279
280static void cb710_remove_one(struct pci_dev *pdev)
281{
282 struct cb710_chip *chip = pci_get_drvdata(pdev);
283
284 cb710_unregister_slot(chip, CB710_SLOT_SM);
285 cb710_unregister_slot(chip, CB710_SLOT_MS);
286 cb710_unregister_slot(chip, CB710_SLOT_MMC);
287#ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS
288 BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
289#endif
290
291 ida_free(&cb710_ida, chip->platform_id);
292}
293
294static const struct pci_device_id cb710_pci_tbl[] = {
295 { PCI_DEVICE(PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH) },
296 { }
297};
298
299static SIMPLE_DEV_PM_OPS(cb710_pm_ops, cb710_suspend, cb710_resume);
300
301static struct pci_driver cb710_driver = {
302 .name = KBUILD_MODNAME,
303 .id_table = cb710_pci_tbl,
304 .probe = cb710_probe,
305 .remove = cb710_remove_one,
306 .driver.pm = &cb710_pm_ops,
307};
308
309static int __init cb710_init_module(void)
310{
311 return pci_register_driver(&cb710_driver);
312}
313
314static void __exit cb710_cleanup_module(void)
315{
316 pci_unregister_driver(&cb710_driver);
317 ida_destroy(&cb710_ida);
318}
319
320module_init(cb710_init_module);
321module_exit(cb710_cleanup_module);
322
323MODULE_AUTHOR("Michał Mirosław <[email protected]>");
324MODULE_DESCRIPTION("ENE CB710 memory card reader driver");
325MODULE_LICENSE("GPL");
326MODULE_DEVICE_TABLE(pci, cb710_pci_tbl);