xref: /openbmc/linux/drivers/misc/tifm_7xx1.c (revision fd2c930c)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  tifm_7xx1.c - TI FlashMedia driver
4  *
5  *  Copyright (C) 2006 Alex Dubov <oakad@yahoo.com>
6  */
7 
8 #include <linux/tifm.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/module.h>
11 
12 #define DRIVER_NAME "tifm_7xx1"
13 #define DRIVER_VERSION "0.8"
14 
15 #define TIFM_IRQ_ENABLE           0x80000000
16 #define TIFM_IRQ_SOCKMASK(x)      (x)
17 #define TIFM_IRQ_CARDMASK(x)      ((x) << 8)
18 #define TIFM_IRQ_FIFOMASK(x)      ((x) << 16)
19 #define TIFM_IRQ_SETALL           0xffffffff
20 
tifm_7xx1_dummy_eject(struct tifm_adapter * fm,struct tifm_dev * sock)21 static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
22 				  struct tifm_dev *sock)
23 {
24 }
25 
tifm_7xx1_eject(struct tifm_adapter * fm,struct tifm_dev * sock)26 static void tifm_7xx1_eject(struct tifm_adapter *fm, struct tifm_dev *sock)
27 {
28 	unsigned long flags;
29 
30 	spin_lock_irqsave(&fm->lock, flags);
31 	fm->socket_change_set |= 1 << sock->socket_id;
32 	tifm_queue_work(&fm->media_switcher);
33 	spin_unlock_irqrestore(&fm->lock, flags);
34 }
35 
tifm_7xx1_isr(int irq,void * dev_id)36 static irqreturn_t tifm_7xx1_isr(int irq, void *dev_id)
37 {
38 	struct tifm_adapter *fm = dev_id;
39 	struct tifm_dev *sock;
40 	unsigned int irq_status, cnt;
41 
42 	spin_lock(&fm->lock);
43 	irq_status = readl(fm->addr + FM_INTERRUPT_STATUS);
44 	if (irq_status == 0 || irq_status == (~0)) {
45 		spin_unlock(&fm->lock);
46 		return IRQ_NONE;
47 	}
48 
49 	if (irq_status & TIFM_IRQ_ENABLE) {
50 		writel(TIFM_IRQ_ENABLE, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
51 
52 		for (cnt = 0; cnt < fm->num_sockets; cnt++) {
53 			sock = fm->sockets[cnt];
54 			if (sock) {
55 				if ((irq_status >> cnt) & TIFM_IRQ_FIFOMASK(1))
56 					sock->data_event(sock);
57 				if ((irq_status >> cnt) & TIFM_IRQ_CARDMASK(1))
58 					sock->card_event(sock);
59 			}
60 		}
61 
62 		fm->socket_change_set |= irq_status
63 					 & ((1 << fm->num_sockets) - 1);
64 	}
65 	writel(irq_status, fm->addr + FM_INTERRUPT_STATUS);
66 
67 	if (fm->finish_me)
68 		complete_all(fm->finish_me);
69 	else if (!fm->socket_change_set)
70 		writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
71 	else
72 		tifm_queue_work(&fm->media_switcher);
73 
74 	spin_unlock(&fm->lock);
75 	return IRQ_HANDLED;
76 }
77 
tifm_7xx1_toggle_sock_power(char __iomem * sock_addr)78 static unsigned char tifm_7xx1_toggle_sock_power(char __iomem *sock_addr)
79 {
80 	unsigned int s_state;
81 	int cnt;
82 
83 	writel(0x0e00, sock_addr + SOCK_CONTROL);
84 
85 	for (cnt = 16; cnt <= 256; cnt <<= 1) {
86 		if (!(TIFM_SOCK_STATE_POWERED
87 		      & readl(sock_addr + SOCK_PRESENT_STATE)))
88 			break;
89 
90 		msleep(cnt);
91 	}
92 
93 	s_state = readl(sock_addr + SOCK_PRESENT_STATE);
94 	if (!(TIFM_SOCK_STATE_OCCUPIED & s_state))
95 		return 0;
96 
97 	writel(readl(sock_addr + SOCK_CONTROL) | TIFM_CTRL_LED,
98 	       sock_addr + SOCK_CONTROL);
99 
100 	/* xd needs some extra time before power on */
101 	if (((readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7)
102 	    == TIFM_TYPE_XD)
103 		msleep(40);
104 
105 	writel((s_state & TIFM_CTRL_POWER_MASK) | 0x0c00,
106 	       sock_addr + SOCK_CONTROL);
107 	/* wait for power to stabilize */
108 	msleep(20);
109 	for (cnt = 16; cnt <= 256; cnt <<= 1) {
110 		if ((TIFM_SOCK_STATE_POWERED
111 		     & readl(sock_addr + SOCK_PRESENT_STATE)))
112 			break;
113 
114 		msleep(cnt);
115 	}
116 
117 	writel(readl(sock_addr + SOCK_CONTROL) & (~TIFM_CTRL_LED),
118 	       sock_addr + SOCK_CONTROL);
119 
120 	return (readl(sock_addr + SOCK_PRESENT_STATE) >> 4) & 7;
121 }
122 
tifm_7xx1_sock_power_off(char __iomem * sock_addr)123 inline static void tifm_7xx1_sock_power_off(char __iomem *sock_addr)
124 {
125 	writel((~TIFM_CTRL_POWER_MASK) & readl(sock_addr + SOCK_CONTROL),
126 	       sock_addr + SOCK_CONTROL);
127 }
128 
129 inline static char __iomem *
tifm_7xx1_sock_addr(char __iomem * base_addr,unsigned int sock_num)130 tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
131 {
132 	return base_addr + ((sock_num + 1) << 10);
133 }
134 
tifm_7xx1_switch_media(struct work_struct * work)135 static void tifm_7xx1_switch_media(struct work_struct *work)
136 {
137 	struct tifm_adapter *fm = container_of(work, struct tifm_adapter,
138 					       media_switcher);
139 	struct tifm_dev *sock;
140 	char __iomem *sock_addr;
141 	unsigned long flags;
142 	unsigned char media_id;
143 	unsigned int socket_change_set, cnt;
144 
145 	spin_lock_irqsave(&fm->lock, flags);
146 	socket_change_set = fm->socket_change_set;
147 	fm->socket_change_set = 0;
148 
149 	dev_dbg(fm->dev.parent, "checking media set %x\n",
150 		socket_change_set);
151 
152 	if (!socket_change_set) {
153 		spin_unlock_irqrestore(&fm->lock, flags);
154 		return;
155 	}
156 
157 	for (cnt = 0; cnt < fm->num_sockets; cnt++) {
158 		if (!(socket_change_set & (1 << cnt)))
159 			continue;
160 		sock = fm->sockets[cnt];
161 		if (sock) {
162 			printk(KERN_INFO
163 			       "%s : demand removing card from socket %u:%u\n",
164 			       dev_name(&fm->dev), fm->id, cnt);
165 			fm->sockets[cnt] = NULL;
166 			sock_addr = sock->addr;
167 			spin_unlock_irqrestore(&fm->lock, flags);
168 			device_unregister(&sock->dev);
169 			spin_lock_irqsave(&fm->lock, flags);
170 			tifm_7xx1_sock_power_off(sock_addr);
171 			writel(0x0e00, sock_addr + SOCK_CONTROL);
172 		}
173 
174 		spin_unlock_irqrestore(&fm->lock, flags);
175 
176 		media_id = tifm_7xx1_toggle_sock_power(
177 				tifm_7xx1_sock_addr(fm->addr, cnt));
178 
179 		// tifm_alloc_device will check if media_id is valid
180 		sock = tifm_alloc_device(fm, cnt, media_id);
181 		if (sock) {
182 			sock->addr = tifm_7xx1_sock_addr(fm->addr, cnt);
183 
184 			if (!device_register(&sock->dev)) {
185 				spin_lock_irqsave(&fm->lock, flags);
186 				if (!fm->sockets[cnt]) {
187 					fm->sockets[cnt] = sock;
188 					sock = NULL;
189 				}
190 				spin_unlock_irqrestore(&fm->lock, flags);
191 			}
192 			if (sock)
193 				put_device(&sock->dev);
194 		}
195 		spin_lock_irqsave(&fm->lock, flags);
196 	}
197 
198 	writel(TIFM_IRQ_FIFOMASK(socket_change_set)
199 	       | TIFM_IRQ_CARDMASK(socket_change_set),
200 	       fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
201 
202 	writel(TIFM_IRQ_FIFOMASK(socket_change_set)
203 	       | TIFM_IRQ_CARDMASK(socket_change_set),
204 	       fm->addr + FM_SET_INTERRUPT_ENABLE);
205 
206 	writel(TIFM_IRQ_ENABLE, fm->addr + FM_SET_INTERRUPT_ENABLE);
207 	spin_unlock_irqrestore(&fm->lock, flags);
208 }
209 
tifm_7xx1_suspend(struct device * dev_d)210 static int __maybe_unused tifm_7xx1_suspend(struct device *dev_d)
211 {
212 	struct pci_dev *dev = to_pci_dev(dev_d);
213 	struct tifm_adapter *fm = pci_get_drvdata(dev);
214 	int cnt;
215 
216 	dev_dbg(&dev->dev, "suspending host\n");
217 
218 	for (cnt = 0; cnt < fm->num_sockets; cnt++) {
219 		if (fm->sockets[cnt])
220 			tifm_7xx1_sock_power_off(fm->sockets[cnt]->addr);
221 	}
222 
223 	device_wakeup_disable(dev_d);
224 	return 0;
225 }
226 
tifm_7xx1_resume(struct device * dev_d)227 static int __maybe_unused tifm_7xx1_resume(struct device *dev_d)
228 {
229 	struct pci_dev *dev = to_pci_dev(dev_d);
230 	struct tifm_adapter *fm = pci_get_drvdata(dev);
231 	int rc;
232 	unsigned long timeout;
233 	unsigned int good_sockets = 0, bad_sockets = 0;
234 	unsigned long flags;
235 	/* Maximum number of entries is 4 */
236 	unsigned char new_ids[4];
237 	DECLARE_COMPLETION_ONSTACK(finish_resume);
238 
239 	if (WARN_ON(fm->num_sockets > ARRAY_SIZE(new_ids)))
240 		return -ENXIO;
241 
242 	pci_set_master(dev);
243 
244 	dev_dbg(&dev->dev, "resuming host\n");
245 
246 	for (rc = 0; rc < fm->num_sockets; rc++)
247 		new_ids[rc] = tifm_7xx1_toggle_sock_power(
248 					tifm_7xx1_sock_addr(fm->addr, rc));
249 	spin_lock_irqsave(&fm->lock, flags);
250 	for (rc = 0; rc < fm->num_sockets; rc++) {
251 		if (fm->sockets[rc]) {
252 			if (fm->sockets[rc]->type == new_ids[rc])
253 				good_sockets |= 1 << rc;
254 			else
255 				bad_sockets |= 1 << rc;
256 		}
257 	}
258 
259 	writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
260 	       fm->addr + FM_SET_INTERRUPT_ENABLE);
261 	dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
262 		good_sockets, bad_sockets);
263 
264 	fm->socket_change_set = 0;
265 	if (good_sockets) {
266 		fm->finish_me = &finish_resume;
267 		spin_unlock_irqrestore(&fm->lock, flags);
268 		timeout = wait_for_completion_timeout(&finish_resume, HZ);
269 		dev_dbg(&dev->dev, "wait returned %lu\n", timeout);
270 		writel(TIFM_IRQ_FIFOMASK(good_sockets)
271 		       | TIFM_IRQ_CARDMASK(good_sockets),
272 		       fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
273 		writel(TIFM_IRQ_FIFOMASK(good_sockets)
274 		       | TIFM_IRQ_CARDMASK(good_sockets),
275 		       fm->addr + FM_SET_INTERRUPT_ENABLE);
276 		spin_lock_irqsave(&fm->lock, flags);
277 		fm->finish_me = NULL;
278 		fm->socket_change_set ^= good_sockets & fm->socket_change_set;
279 	}
280 
281 	fm->socket_change_set |= bad_sockets;
282 	if (fm->socket_change_set)
283 		tifm_queue_work(&fm->media_switcher);
284 
285 	spin_unlock_irqrestore(&fm->lock, flags);
286 	writel(TIFM_IRQ_ENABLE,
287 	       fm->addr + FM_SET_INTERRUPT_ENABLE);
288 
289 	return 0;
290 }
291 
tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter * fm,struct tifm_dev * sock)292 static int tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter *fm,
293 				      struct tifm_dev *sock)
294 {
295 	return 0;
296 }
297 
tifm_7xx1_has_ms_pif(struct tifm_adapter * fm,struct tifm_dev * sock)298 static int tifm_7xx1_has_ms_pif(struct tifm_adapter *fm, struct tifm_dev *sock)
299 {
300 	if (((fm->num_sockets == 4) && (sock->socket_id == 2))
301 	    || ((fm->num_sockets == 2) && (sock->socket_id == 0)))
302 		return 1;
303 
304 	return 0;
305 }
306 
tifm_7xx1_probe(struct pci_dev * dev,const struct pci_device_id * dev_id)307 static int tifm_7xx1_probe(struct pci_dev *dev,
308 			   const struct pci_device_id *dev_id)
309 {
310 	struct tifm_adapter *fm;
311 	int pci_dev_busy = 0;
312 	int rc;
313 
314 	rc = dma_set_mask(&dev->dev, DMA_BIT_MASK(32));
315 	if (rc)
316 		return rc;
317 
318 	rc = pci_enable_device(dev);
319 	if (rc)
320 		return rc;
321 
322 	pci_set_master(dev);
323 
324 	rc = pci_request_regions(dev, DRIVER_NAME);
325 	if (rc) {
326 		pci_dev_busy = 1;
327 		goto err_out;
328 	}
329 
330 	pci_intx(dev, 1);
331 
332 	fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
333 				? 4 : 2, &dev->dev);
334 	if (!fm) {
335 		rc = -ENOMEM;
336 		goto err_out_int;
337 	}
338 
339 	INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
340 	fm->eject = tifm_7xx1_eject;
341 	fm->has_ms_pif = tifm_7xx1_has_ms_pif;
342 	pci_set_drvdata(dev, fm);
343 
344 	fm->addr = pci_ioremap_bar(dev, 0);
345 	if (!fm->addr) {
346 		rc = -ENODEV;
347 		goto err_out_free;
348 	}
349 
350 	rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
351 	if (rc)
352 		goto err_out_unmap;
353 
354 	rc = tifm_add_adapter(fm);
355 	if (rc)
356 		goto err_out_irq;
357 
358 	writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
359 	       fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
360 	writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
361 	       fm->addr + FM_SET_INTERRUPT_ENABLE);
362 	return 0;
363 
364 err_out_irq:
365 	free_irq(dev->irq, fm);
366 err_out_unmap:
367 	iounmap(fm->addr);
368 err_out_free:
369 	tifm_free_adapter(fm);
370 err_out_int:
371 	pci_intx(dev, 0);
372 	pci_release_regions(dev);
373 err_out:
374 	if (!pci_dev_busy)
375 		pci_disable_device(dev);
376 	return rc;
377 }
378 
tifm_7xx1_remove(struct pci_dev * dev)379 static void tifm_7xx1_remove(struct pci_dev *dev)
380 {
381 	struct tifm_adapter *fm = pci_get_drvdata(dev);
382 	int cnt;
383 
384 	fm->eject = tifm_7xx1_dummy_eject;
385 	fm->has_ms_pif = tifm_7xx1_dummy_has_ms_pif;
386 	writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
387 	free_irq(dev->irq, fm);
388 
389 	tifm_remove_adapter(fm);
390 
391 	for (cnt = 0; cnt < fm->num_sockets; cnt++)
392 		tifm_7xx1_sock_power_off(tifm_7xx1_sock_addr(fm->addr, cnt));
393 
394 	iounmap(fm->addr);
395 	pci_intx(dev, 0);
396 	pci_release_regions(dev);
397 
398 	pci_disable_device(dev);
399 	tifm_free_adapter(fm);
400 }
401 
402 static const struct pci_device_id tifm_7xx1_pci_tbl[] = {
403 	{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
404 	  PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
405         { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
406 	  PCI_ANY_ID, 0, 0, 0 },
407 	{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
408 	  PCI_ANY_ID, 0, 0, 0 },
409 	{ }
410 };
411 
412 static SIMPLE_DEV_PM_OPS(tifm_7xx1_pm_ops, tifm_7xx1_suspend, tifm_7xx1_resume);
413 
414 static struct pci_driver tifm_7xx1_driver = {
415 	.name = DRIVER_NAME,
416 	.id_table = tifm_7xx1_pci_tbl,
417 	.probe = tifm_7xx1_probe,
418 	.remove = tifm_7xx1_remove,
419 	.driver.pm = &tifm_7xx1_pm_ops,
420 };
421 
422 module_pci_driver(tifm_7xx1_driver);
423 MODULE_AUTHOR("Alex Dubov");
424 MODULE_DESCRIPTION("TI FlashMedia host driver");
425 MODULE_LICENSE("GPL");
426 MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
427 MODULE_VERSION(DRIVER_VERSION);
428