59 struct bt_bmc {  struct
78 static u8 bt_inb(struct bt_bmc *bt_bmc, int reg)  in bt_inb()  argument
83 	rc = regmap_read(bt_bmc->map, bt_bmc->offset + reg, &val);  in bt_inb()
89 static void bt_outb(struct bt_bmc *bt_bmc, u8 data, int reg)  in bt_outb()  argument
93 	rc = regmap_write(bt_bmc->map, bt_bmc->offset + reg, data);  in bt_outb()
97 static void clr_rd_ptr(struct bt_bmc *bt_bmc)  in clr_rd_ptr()  argument
99 	bt_outb(bt_bmc, BT_CTRL_CLR_RD_PTR, BT_CTRL);  in clr_rd_ptr()
102 static void clr_wr_ptr(struct bt_bmc *bt_bmc)  in clr_wr_ptr()  argument
104 	bt_outb(bt_bmc, BT_CTRL_CLR_WR_PTR, BT_CTRL);  in clr_wr_ptr()
107 static void clr_h2b_atn(struct bt_bmc *bt_bmc)  in clr_h2b_atn()  argument
109 	bt_outb(bt_bmc, BT_CTRL_H2B_ATN, BT_CTRL);  in clr_h2b_atn()
112 static void set_b_busy(struct bt_bmc *bt_bmc)  in set_b_busy()  argument
114 	if (!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY))  in set_b_busy()
115 		bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);  in set_b_busy()
118 static void clr_b_busy(struct bt_bmc *bt_bmc)  in clr_b_busy()  argument
120 	if (bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY)  in clr_b_busy()
121 		bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);  in clr_b_busy()
124 static void set_b2h_atn(struct bt_bmc *bt_bmc)  in set_b2h_atn()  argument
126 	bt_outb(bt_bmc, BT_CTRL_B2H_ATN, BT_CTRL);  in set_b2h_atn()
129 static u8 bt_read(struct bt_bmc *bt_bmc)  in bt_read()  argument
131 	return bt_inb(bt_bmc, BT_BMC2HOST);  in bt_read()
134 static ssize_t bt_readn(struct bt_bmc *bt_bmc, u8 *buf, size_t n)  in bt_readn()  argument
139 		buf[i] = bt_read(bt_bmc);  in bt_readn()
143 static void bt_write(struct bt_bmc *bt_bmc, u8 c)  in bt_write()  argument
145 	bt_outb(bt_bmc, c, BT_BMC2HOST);  in bt_write()
148 static ssize_t bt_writen(struct bt_bmc *bt_bmc, u8 *buf, size_t n)  in bt_writen()  argument
153 		bt_write(bt_bmc, buf[i]);  in bt_writen()
157 static void set_sms_atn(struct bt_bmc *bt_bmc)  in set_sms_atn()  argument
159 	bt_outb(bt_bmc, BT_CTRL_SMS_ATN, BT_CTRL);  in set_sms_atn()
162 static struct bt_bmc *file_bt_bmc(struct file *file)  in file_bt_bmc()
164 	return container_of(file->private_data, struct bt_bmc, miscdev);  in file_bt_bmc()
169 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_open()  local
172 		clr_b_busy(bt_bmc);  in bt_bmc_open()
196 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_read()  local
205 	if (wait_event_interruptible(bt_bmc->queue,  in bt_bmc_read()
206 				     bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))  in bt_bmc_read()
209 	mutex_lock(&bt_bmc->mutex);  in bt_bmc_read()
211 	if (unlikely(!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))) {  in bt_bmc_read()
216 	set_b_busy(bt_bmc);  in bt_bmc_read()
217 	clr_h2b_atn(bt_bmc);  in bt_bmc_read()
218 	clr_rd_ptr(bt_bmc);  in bt_bmc_read()
224 	kbuffer[0] = bt_read(bt_bmc);  in bt_bmc_read()
234 		bt_readn(bt_bmc, kbuffer + len_byte, nread);  in bt_bmc_read()
246 	clr_b_busy(bt_bmc);  in bt_bmc_read()
249 	mutex_unlock(&bt_bmc->mutex);  in bt_bmc_read()
262 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_write()  local
279 	if (wait_event_interruptible(bt_bmc->queue,  in bt_bmc_write()
280 				     !(bt_inb(bt_bmc, BT_CTRL) &  in bt_bmc_write()
284 	mutex_lock(&bt_bmc->mutex);  in bt_bmc_write()
286 	if (unlikely(bt_inb(bt_bmc, BT_CTRL) &  in bt_bmc_write()
292 	clr_wr_ptr(bt_bmc);  in bt_bmc_write()
301 		bt_writen(bt_bmc, kbuffer, nwritten);  in bt_bmc_write()
308 	set_b2h_atn(bt_bmc);  in bt_bmc_write()
311 	mutex_unlock(&bt_bmc->mutex);  in bt_bmc_write()
318 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_ioctl()  local
322 		set_sms_atn(bt_bmc);  in bt_bmc_ioctl()
330 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_release()  local
333 	set_b_busy(bt_bmc);  in bt_bmc_release()
339 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_poll()  local
343 	poll_wait(file, &bt_bmc->queue, wait);  in bt_bmc_poll()
345 	ctrl = bt_inb(bt_bmc, BT_CTRL);  in bt_bmc_poll()
368 	struct bt_bmc *bt_bmc = from_timer(bt_bmc, t, poll_timer);  in poll_timer()  local
370 	bt_bmc->poll_timer.expires += msecs_to_jiffies(500);  in poll_timer()
371 	wake_up(&bt_bmc->queue);  in poll_timer()
372 	add_timer(&bt_bmc->poll_timer);  in poll_timer()
377 	struct bt_bmc *bt_bmc = arg;  in bt_bmc_irq()  local
381 	rc = regmap_read(bt_bmc->map, bt_bmc->offset + BT_CR2, &reg);  in bt_bmc_irq()
390 	regmap_write(bt_bmc->map, bt_bmc->offset + BT_CR2, reg);  in bt_bmc_irq()
392 	wake_up(&bt_bmc->queue);  in bt_bmc_irq()
396 static int bt_bmc_config_irq(struct bt_bmc *bt_bmc,  in bt_bmc_config_irq()  argument
402 	bt_bmc->irq = platform_get_irq(pdev, 0);  in bt_bmc_config_irq()
403 	if (!bt_bmc->irq)  in bt_bmc_config_irq()
406 	rc = devm_request_irq(dev, bt_bmc->irq, bt_bmc_irq, IRQF_SHARED,  in bt_bmc_config_irq()
407 			      DEVICE_NAME, bt_bmc);  in bt_bmc_config_irq()
409 		dev_warn(dev, "Unable to request IRQ %d\n", bt_bmc->irq);  in bt_bmc_config_irq()
410 		bt_bmc->irq = 0;  in bt_bmc_config_irq()
420 	rc = regmap_update_bits(bt_bmc->map, bt_bmc->offset + BT_CR1,  in bt_bmc_config_irq()
429 	struct bt_bmc *bt_bmc;  in bt_bmc_probe()  local
439 	bt_bmc = devm_kzalloc(dev, sizeof(*bt_bmc), GFP_KERNEL);  in bt_bmc_probe()
440 	if (!bt_bmc)  in bt_bmc_probe()
443 	dev_set_drvdata(&pdev->dev, bt_bmc);  in bt_bmc_probe()
445 	bt_bmc->map = syscon_node_to_regmap(pdev->dev.parent->of_node);  in bt_bmc_probe()
446 	if (IS_ERR(bt_bmc->map)) {  in bt_bmc_probe()
459 		bt_bmc->map = devm_regmap_init_mmio(dev, base, &bt_regmap_cfg);  in bt_bmc_probe()
460 		bt_bmc->offset = 0;  in bt_bmc_probe()
462 		rc = of_property_read_u32(dev->of_node, "reg", &bt_bmc->offset);  in bt_bmc_probe()
467 	mutex_init(&bt_bmc->mutex);  in bt_bmc_probe()
468 	init_waitqueue_head(&bt_bmc->queue);  in bt_bmc_probe()
470 	bt_bmc->miscdev.minor	= MISC_DYNAMIC_MINOR,  in bt_bmc_probe()
471 		bt_bmc->miscdev.name	= DEVICE_NAME,  in bt_bmc_probe()
472 		bt_bmc->miscdev.fops	= &bt_bmc_fops,  in bt_bmc_probe()
473 		bt_bmc->miscdev.parent = dev;  in bt_bmc_probe()
474 	rc = misc_register(&bt_bmc->miscdev);  in bt_bmc_probe()
480 	bt_bmc_config_irq(bt_bmc, pdev);  in bt_bmc_probe()
482 	if (bt_bmc->irq) {  in bt_bmc_probe()
483 		dev_info(dev, "Using IRQ %d\n", bt_bmc->irq);  in bt_bmc_probe()
486 		timer_setup(&bt_bmc->poll_timer, poll_timer, 0);  in bt_bmc_probe()
487 		bt_bmc->poll_timer.expires = jiffies + msecs_to_jiffies(10);  in bt_bmc_probe()
488 		add_timer(&bt_bmc->poll_timer);  in bt_bmc_probe()
491 	regmap_write(bt_bmc->map, bt_bmc->offset + BT_CR0,  in bt_bmc_probe()
498 	clr_b_busy(bt_bmc);  in bt_bmc_probe()
505 	struct bt_bmc *bt_bmc = dev_get_drvdata(&pdev->dev);  in bt_bmc_remove()  local
507 	misc_deregister(&bt_bmc->miscdev);  in bt_bmc_remove()
508 	if (!bt_bmc->irq)  in bt_bmc_remove()
509 		del_timer_sync(&bt_bmc->poll_timer);  in bt_bmc_remove()