57 struct bt_bmc {  struct
69 static u8 bt_inb(struct bt_bmc *bt_bmc, int reg)  in bt_inb()  argument
71 	return readb(bt_bmc->base + reg);  in bt_inb()
74 static void bt_outb(struct bt_bmc *bt_bmc, u8 data, int reg)  in bt_outb()  argument
76 	writeb(data, bt_bmc->base + reg);  in bt_outb()
79 static void clr_rd_ptr(struct bt_bmc *bt_bmc)  in clr_rd_ptr()  argument
81 	bt_outb(bt_bmc, BT_CTRL_CLR_RD_PTR, BT_CTRL);  in clr_rd_ptr()
84 static void clr_wr_ptr(struct bt_bmc *bt_bmc)  in clr_wr_ptr()  argument
86 	bt_outb(bt_bmc, BT_CTRL_CLR_WR_PTR, BT_CTRL);  in clr_wr_ptr()
89 static void clr_h2b_atn(struct bt_bmc *bt_bmc)  in clr_h2b_atn()  argument
91 	bt_outb(bt_bmc, BT_CTRL_H2B_ATN, BT_CTRL);  in clr_h2b_atn()
94 static void set_b_busy(struct bt_bmc *bt_bmc)  in set_b_busy()  argument
96 	if (!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY))  in set_b_busy()
97 		bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);  in set_b_busy()
100 static void clr_b_busy(struct bt_bmc *bt_bmc)  in clr_b_busy()  argument
102 	if (bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY)  in clr_b_busy()
103 		bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);  in clr_b_busy()
106 static void set_b2h_atn(struct bt_bmc *bt_bmc)  in set_b2h_atn()  argument
108 	bt_outb(bt_bmc, BT_CTRL_B2H_ATN, BT_CTRL);  in set_b2h_atn()
111 static u8 bt_read(struct bt_bmc *bt_bmc)  in bt_read()  argument
113 	return bt_inb(bt_bmc, BT_BMC2HOST);  in bt_read()
116 static ssize_t bt_readn(struct bt_bmc *bt_bmc, u8 *buf, size_t n)  in bt_readn()  argument
121 		buf[i] = bt_read(bt_bmc);  in bt_readn()
125 static void bt_write(struct bt_bmc *bt_bmc, u8 c)  in bt_write()  argument
127 	bt_outb(bt_bmc, c, BT_BMC2HOST);  in bt_write()
130 static ssize_t bt_writen(struct bt_bmc *bt_bmc, u8 *buf, size_t n)  in bt_writen()  argument
135 		bt_write(bt_bmc, buf[i]);  in bt_writen()
139 static void set_sms_atn(struct bt_bmc *bt_bmc)  in set_sms_atn()  argument
141 	bt_outb(bt_bmc, BT_CTRL_SMS_ATN, BT_CTRL);  in set_sms_atn()
144 static struct bt_bmc *file_bt_bmc(struct file *file)  in file_bt_bmc()
146 	return container_of(file->private_data, struct bt_bmc, miscdev);  in file_bt_bmc()
151 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_open()  local
154 		clr_b_busy(bt_bmc);  in bt_bmc_open()
178 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_read()  local
187 	if (wait_event_interruptible(bt_bmc->queue,  in bt_bmc_read()
188 				     bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))  in bt_bmc_read()
191 	mutex_lock(&bt_bmc->mutex);  in bt_bmc_read()
193 	if (unlikely(!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))) {  in bt_bmc_read()
198 	set_b_busy(bt_bmc);  in bt_bmc_read()
199 	clr_h2b_atn(bt_bmc);  in bt_bmc_read()
200 	clr_rd_ptr(bt_bmc);  in bt_bmc_read()
206 	kbuffer[0] = bt_read(bt_bmc);  in bt_bmc_read()
216 		bt_readn(bt_bmc, kbuffer + len_byte, nread);  in bt_bmc_read()
228 	clr_b_busy(bt_bmc);  in bt_bmc_read()
231 	mutex_unlock(&bt_bmc->mutex);  in bt_bmc_read()
244 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_write()  local
261 	if (wait_event_interruptible(bt_bmc->queue,  in bt_bmc_write()
262 				     !(bt_inb(bt_bmc, BT_CTRL) &  in bt_bmc_write()
266 	mutex_lock(&bt_bmc->mutex);  in bt_bmc_write()
268 	if (unlikely(bt_inb(bt_bmc, BT_CTRL) &  in bt_bmc_write()
274 	clr_wr_ptr(bt_bmc);  in bt_bmc_write()
283 		bt_writen(bt_bmc, kbuffer, nwritten);  in bt_bmc_write()
290 	set_b2h_atn(bt_bmc);  in bt_bmc_write()
293 	mutex_unlock(&bt_bmc->mutex);  in bt_bmc_write()
300 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_ioctl()  local
304 		set_sms_atn(bt_bmc);  in bt_bmc_ioctl()
312 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_release()  local
315 	set_b_busy(bt_bmc);  in bt_bmc_release()
321 	struct bt_bmc *bt_bmc = file_bt_bmc(file);  in bt_bmc_poll()  local
325 	poll_wait(file, &bt_bmc->queue, wait);  in bt_bmc_poll()
327 	ctrl = bt_inb(bt_bmc, BT_CTRL);  in bt_bmc_poll()
350 	struct bt_bmc *bt_bmc = from_timer(bt_bmc, t, poll_timer);  in poll_timer()  local
352 	bt_bmc->poll_timer.expires += msecs_to_jiffies(500);  in poll_timer()
353 	wake_up(&bt_bmc->queue);  in poll_timer()
354 	add_timer(&bt_bmc->poll_timer);  in poll_timer()
359 	struct bt_bmc *bt_bmc = arg;  in bt_bmc_irq()  local
362 	reg = readl(bt_bmc->base + BT_CR2);  in bt_bmc_irq()
369 	writel(reg, bt_bmc->base + BT_CR2);  in bt_bmc_irq()
371 	wake_up(&bt_bmc->queue);  in bt_bmc_irq()
375 static int bt_bmc_config_irq(struct bt_bmc *bt_bmc,  in bt_bmc_config_irq()  argument
382 	bt_bmc->irq = platform_get_irq_optional(pdev, 0);  in bt_bmc_config_irq()
383 	if (bt_bmc->irq < 0)  in bt_bmc_config_irq()
384 		return bt_bmc->irq;  in bt_bmc_config_irq()
386 	rc = devm_request_irq(dev, bt_bmc->irq, bt_bmc_irq, IRQF_SHARED,  in bt_bmc_config_irq()
387 			      DEVICE_NAME, bt_bmc);  in bt_bmc_config_irq()
389 		dev_warn(dev, "Unable to request IRQ %d\n", bt_bmc->irq);  in bt_bmc_config_irq()
390 		bt_bmc->irq = rc;  in bt_bmc_config_irq()
400 	reg = readl(bt_bmc->base + BT_CR1);  in bt_bmc_config_irq()
402 	writel(reg, bt_bmc->base + BT_CR1);  in bt_bmc_config_irq()
409 	struct bt_bmc *bt_bmc;  in bt_bmc_probe()  local
416 	bt_bmc = devm_kzalloc(dev, sizeof(*bt_bmc), GFP_KERNEL);  in bt_bmc_probe()
417 	if (!bt_bmc)  in bt_bmc_probe()
420 	dev_set_drvdata(&pdev->dev, bt_bmc);  in bt_bmc_probe()
422 	bt_bmc->base = devm_platform_ioremap_resource(pdev, 0);  in bt_bmc_probe()
423 	if (IS_ERR(bt_bmc->base))  in bt_bmc_probe()
424 		return PTR_ERR(bt_bmc->base);  in bt_bmc_probe()
426 	mutex_init(&bt_bmc->mutex);  in bt_bmc_probe()
427 	init_waitqueue_head(&bt_bmc->queue);  in bt_bmc_probe()
429 	bt_bmc->miscdev.minor	= MISC_DYNAMIC_MINOR;  in bt_bmc_probe()
430 	bt_bmc->miscdev.name	= DEVICE_NAME;  in bt_bmc_probe()
431 	bt_bmc->miscdev.fops	= &bt_bmc_fops;  in bt_bmc_probe()
432 	bt_bmc->miscdev.parent = dev;  in bt_bmc_probe()
433 	rc = misc_register(&bt_bmc->miscdev);  in bt_bmc_probe()
439 	bt_bmc_config_irq(bt_bmc, pdev);  in bt_bmc_probe()
441 	if (bt_bmc->irq >= 0) {  in bt_bmc_probe()
442 		dev_info(dev, "Using IRQ %d\n", bt_bmc->irq);  in bt_bmc_probe()
445 		timer_setup(&bt_bmc->poll_timer, poll_timer, 0);  in bt_bmc_probe()
446 		bt_bmc->poll_timer.expires = jiffies + msecs_to_jiffies(10);  in bt_bmc_probe()
447 		add_timer(&bt_bmc->poll_timer);  in bt_bmc_probe()
455 		bt_bmc->base + BT_CR0);  in bt_bmc_probe()
457 	clr_b_busy(bt_bmc);  in bt_bmc_probe()
464 	struct bt_bmc *bt_bmc = dev_get_drvdata(&pdev->dev);  in bt_bmc_remove()  local
466 	misc_deregister(&bt_bmc->miscdev);  in bt_bmc_remove()
467 	if (bt_bmc->irq < 0)  in bt_bmc_remove()
468 		del_timer_sync(&bt_bmc->poll_timer);  in bt_bmc_remove()