/drivers/misc/tifm_7xx1.c

  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
 21static void tifm_7xx1_dummy_eject(struct tifm_adapter *fm,
 22				  struct tifm_dev *sock)
 23{
 24}
 25
 26static 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
 36static 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
 78static 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
123inline 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
129inline static char __iomem *
130tifm_7xx1_sock_addr(char __iomem *base_addr, unsigned int sock_num)
131{
132	return base_addr + ((sock_num + 1) << 10);
133}
134
135static 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				tifm_free_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
210#ifdef CONFIG_PM
211
212static int tifm_7xx1_suspend(struct pci_dev *dev, pm_message_t state)
213{
214	struct tifm_adapter *fm = pci_get_drvdata(dev);
215	int cnt;
216
217	dev_dbg(&dev->dev, "suspending host\n");
218
219	for (cnt = 0; cnt < fm->num_sockets; cnt++) {
220		if (fm->sockets[cnt])
221			tifm_7xx1_sock_power_off(fm->sockets[cnt]->addr);
222	}
223
224	pci_save_state(dev);
225	pci_enable_wake(dev, pci_choose_state(dev, state), 0);
226	pci_disable_device(dev);
227	pci_set_power_state(dev, pci_choose_state(dev, state));
228	return 0;
229}
230
231static int tifm_7xx1_resume(struct pci_dev *dev)
232{
233	struct tifm_adapter *fm = pci_get_drvdata(dev);
234	int rc;
235	unsigned long timeout;
236	unsigned int good_sockets = 0, bad_sockets = 0;
237	unsigned long flags;
238	/* Maximum number of entries is 4 */
239	unsigned char new_ids[4];
240	DECLARE_COMPLETION_ONSTACK(finish_resume);
241
242	if (WARN_ON(fm->num_sockets > ARRAY_SIZE(new_ids)))
243		return -ENXIO;
244
245	pci_set_power_state(dev, PCI_D0);
246	pci_restore_state(dev);
247	rc = pci_enable_device(dev);
248	if (rc)
249		return rc;
250	pci_set_master(dev);
251
252	dev_dbg(&dev->dev, "resuming host\n");
253
254	for (rc = 0; rc < fm->num_sockets; rc++)
255		new_ids[rc] = tifm_7xx1_toggle_sock_power(
256					tifm_7xx1_sock_addr(fm->addr, rc));
257	spin_lock_irqsave(&fm->lock, flags);
258	for (rc = 0; rc < fm->num_sockets; rc++) {
259		if (fm->sockets[rc]) {
260			if (fm->sockets[rc]->type == new_ids[rc])
261				good_sockets |= 1 << rc;
262			else
263				bad_sockets |= 1 << rc;
264		}
265	}
266
267	writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
268	       fm->addr + FM_SET_INTERRUPT_ENABLE);
269	dev_dbg(&dev->dev, "change sets on resume: good %x, bad %x\n",
270		good_sockets, bad_sockets);
271
272	fm->socket_change_set = 0;
273	if (good_sockets) {
274		fm->finish_me = &finish_resume;
275		spin_unlock_irqrestore(&fm->lock, flags);
276		timeout = wait_for_completion_timeout(&finish_resume, HZ);
277		dev_dbg(&dev->dev, "wait returned %lu\n", timeout);
278		writel(TIFM_IRQ_FIFOMASK(good_sockets)
279		       | TIFM_IRQ_CARDMASK(good_sockets),
280		       fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
281		writel(TIFM_IRQ_FIFOMASK(good_sockets)
282		       | TIFM_IRQ_CARDMASK(good_sockets),
283		       fm->addr + FM_SET_INTERRUPT_ENABLE);
284		spin_lock_irqsave(&fm->lock, flags);
285		fm->finish_me = NULL;
286		fm->socket_change_set ^= good_sockets & fm->socket_change_set;
287	}
288
289	fm->socket_change_set |= bad_sockets;
290	if (fm->socket_change_set)
291		tifm_queue_work(&fm->media_switcher);
292
293	spin_unlock_irqrestore(&fm->lock, flags);
294	writel(TIFM_IRQ_ENABLE,
295	       fm->addr + FM_SET_INTERRUPT_ENABLE);
296
297	return 0;
298}
299
300#else
301
302#define tifm_7xx1_suspend NULL
303#define tifm_7xx1_resume NULL
304
305#endif /* CONFIG_PM */
306
307static int tifm_7xx1_dummy_has_ms_pif(struct tifm_adapter *fm,
308				      struct tifm_dev *sock)
309{
310	return 0;
311}
312
313static int tifm_7xx1_has_ms_pif(struct tifm_adapter *fm, struct tifm_dev *sock)
314{
315	if (((fm->num_sockets == 4) && (sock->socket_id == 2))
316	    || ((fm->num_sockets == 2) && (sock->socket_id == 0)))
317		return 1;
318
319	return 0;
320}
321
322static int tifm_7xx1_probe(struct pci_dev *dev,
323			   const struct pci_device_id *dev_id)
324{
325	struct tifm_adapter *fm;
326	int pci_dev_busy = 0;
327	int rc;
328
329	rc = pci_set_dma_mask(dev, DMA_BIT_MASK(32));
330	if (rc)
331		return rc;
332
333	rc = pci_enable_device(dev);
334	if (rc)
335		return rc;
336
337	pci_set_master(dev);
338
339	rc = pci_request_regions(dev, DRIVER_NAME);
340	if (rc) {
341		pci_dev_busy = 1;
342		goto err_out;
343	}
344
345	pci_intx(dev, 1);
346
347	fm = tifm_alloc_adapter(dev->device == PCI_DEVICE_ID_TI_XX21_XX11_FM
348				? 4 : 2, &dev->dev);
349	if (!fm) {
350		rc = -ENOMEM;
351		goto err_out_int;
352	}
353
354	INIT_WORK(&fm->media_switcher, tifm_7xx1_switch_media);
355	fm->eject = tifm_7xx1_eject;
356	fm->has_ms_pif = tifm_7xx1_has_ms_pif;
357	pci_set_drvdata(dev, fm);
358
359	fm->addr = pci_ioremap_bar(dev, 0);
360	if (!fm->addr) {
361		rc = -ENODEV;
362		goto err_out_free;
363	}
364
365	rc = request_irq(dev->irq, tifm_7xx1_isr, IRQF_SHARED, DRIVER_NAME, fm);
366	if (rc)
367		goto err_out_unmap;
368
369	rc = tifm_add_adapter(fm);
370	if (rc)
371		goto err_out_irq;
372
373	writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
374	       fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
375	writel(TIFM_IRQ_ENABLE | TIFM_IRQ_SOCKMASK((1 << fm->num_sockets) - 1),
376	       fm->addr + FM_SET_INTERRUPT_ENABLE);
377	return 0;
378
379err_out_irq:
380	free_irq(dev->irq, fm);
381err_out_unmap:
382	iounmap(fm->addr);
383err_out_free:
384	tifm_free_adapter(fm);
385err_out_int:
386	pci_intx(dev, 0);
387	pci_release_regions(dev);
388err_out:
389	if (!pci_dev_busy)
390		pci_disable_device(dev);
391	return rc;
392}
393
394static void tifm_7xx1_remove(struct pci_dev *dev)
395{
396	struct tifm_adapter *fm = pci_get_drvdata(dev);
397	int cnt;
398
399	fm->eject = tifm_7xx1_dummy_eject;
400	fm->has_ms_pif = tifm_7xx1_dummy_has_ms_pif;
401	writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
402	free_irq(dev->irq, fm);
403
404	tifm_remove_adapter(fm);
405
406	for (cnt = 0; cnt < fm->num_sockets; cnt++)
407		tifm_7xx1_sock_power_off(tifm_7xx1_sock_addr(fm->addr, cnt));
408
409	iounmap(fm->addr);
410	pci_intx(dev, 0);
411	pci_release_regions(dev);
412
413	pci_disable_device(dev);
414	tifm_free_adapter(fm);
415}
416
417static const struct pci_device_id tifm_7xx1_pci_tbl[] = {
418	{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX21_XX11_FM, PCI_ANY_ID,
419	  PCI_ANY_ID, 0, 0, 0 }, /* xx21 - the one I have */
420        { PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX12_FM, PCI_ANY_ID,
421	  PCI_ANY_ID, 0, 0, 0 },
422	{ PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XX20_FM, PCI_ANY_ID,
423	  PCI_ANY_ID, 0, 0, 0 },
424	{ }
425};
426
427static struct pci_driver tifm_7xx1_driver = {
428	.name = DRIVER_NAME,
429	.id_table = tifm_7xx1_pci_tbl,
430	.probe = tifm_7xx1_probe,
431	.remove = tifm_7xx1_remove,
432	.suspend = tifm_7xx1_suspend,
433	.resume = tifm_7xx1_resume,
434};
435
436module_pci_driver(tifm_7xx1_driver);
437MODULE_AUTHOR("Alex Dubov");
438MODULE_DESCRIPTION("TI FlashMedia host driver");
439MODULE_LICENSE("GPL");
440MODULE_DEVICE_TABLE(pci, tifm_7xx1_pci_tbl);
441MODULE_VERSION(DRIVER_VERSION);