1 // SPDX-License-Identifier: GPL-2.0
19 #include <linux/dma-mapping.h>
37 	struct tty_port port;  member
39 	void __iomem *base;  member
57 	void __iomem *base = qtty->base;  in do_rw_io()  local
59 	spin_lock_irqsave(&qtty->lock, irq_flags);  in do_rw_io()
60 	gf_write_ptr((void *)address, base + GOLDFISH_TTY_REG_DATA_PTR,  in do_rw_io()
61 		     base + GOLDFISH_TTY_REG_DATA_PTR_HIGH);  in do_rw_io()
62 	gf_iowrite32(count, base + GOLDFISH_TTY_REG_DATA_LEN);  in do_rw_io()
66 		       base + GOLDFISH_TTY_REG_CMD);  in do_rw_io()
69 		       base + GOLDFISH_TTY_REG_CMD);  in do_rw_io()
71 	spin_unlock_irqrestore(&qtty->lock, irq_flags);  in do_rw_io()
81 	if (qtty->version > 0) {  in goldfish_tty_rw()
92 			unsigned long avail = next - addr;  in goldfish_tty_rw()
98 			dma_handle = dma_map_single(qtty->dev, (void *)addr,  in goldfish_tty_rw()
101 			if (dma_mapping_error(qtty->dev, dma_handle)) {  in goldfish_tty_rw()
102 				dev_err(qtty->dev, "tty: DMA mapping error.\n");  in goldfish_tty_rw()
111 			dma_unmap_single(qtty->dev, dma_handle, avail, dma_dir);  in goldfish_tty_rw()
134 	void __iomem *base = qtty->base;  in goldfish_tty_interrupt()  local
138 	count = gf_ioread32(base + GOLDFISH_TTY_REG_BYTES_READY);  in goldfish_tty_interrupt()
142 	count = tty_prepare_flip_string(&qtty->port, &buf, count);  in goldfish_tty_interrupt()
146 	tty_flip_buffer_push(&qtty->port);  in goldfish_tty_interrupt()
150 static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty)  in goldfish_tty_activate()  argument
152 	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,  in goldfish_tty_activate()
153 									port);  in goldfish_tty_activate()
154 	gf_iowrite32(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_REG_CMD);  in goldfish_tty_activate()
158 static void goldfish_tty_shutdown(struct tty_port *port)  in goldfish_tty_shutdown()  argument
160 	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,  in goldfish_tty_shutdown()
161 									port);  in goldfish_tty_shutdown()
162 	gf_iowrite32(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_REG_CMD);  in goldfish_tty_shutdown()
167 	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];  in goldfish_tty_open()
168 	return tty_port_open(&qtty->port, tty, filp);  in goldfish_tty_open()
173 	tty_port_close(tty->port, tty, filp);  in goldfish_tty_close()
178 	tty_port_hangup(tty->port);  in goldfish_tty_hangup()
184 	goldfish_tty_do_write(tty->index, buf, count);  in goldfish_tty_write()
195 	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];  in goldfish_tty_chars_in_buffer()
196 	void __iomem *base = qtty->base;  in goldfish_tty_chars_in_buffer()  local
197 	return gf_ioread32(base + GOLDFISH_TTY_REG_BYTES_READY);  in goldfish_tty_chars_in_buffer()
203 	goldfish_tty_do_write(co->index, b, count);  in goldfish_tty_console_write()
209 	*index = c->index;  in goldfish_tty_console_device()
215 	if ((unsigned)co->index >= goldfish_tty_line_count)  in goldfish_tty_console_setup()
216 		return -ENODEV;  in goldfish_tty_console_setup()
217 	if (!goldfish_ttys[co->index].base)  in goldfish_tty_console_setup()
218 		return -ENODEV;  in goldfish_tty_console_setup()
245 		ret = -ENOMEM;  in goldfish_tty_create_driver()
255 	tty->driver_name = "goldfish";  in goldfish_tty_create_driver()
256 	tty->name = "ttyGF";  in goldfish_tty_create_driver()
257 	tty->type = TTY_DRIVER_TYPE_SERIAL;  in goldfish_tty_create_driver()
258 	tty->subtype = SERIAL_TYPE_NORMAL;  in goldfish_tty_create_driver()
259 	tty->init_termios = tty_std_termios;  in goldfish_tty_create_driver()
289 	int ret = -ENODEV;  in goldfish_tty_probe()
292 	void __iomem *base;  in goldfish_tty_probe()  local
299 		return -ENOMEM;  in goldfish_tty_probe()
302 	base = ioremap(r->start, 0x1000);  in goldfish_tty_probe()
303 	if (!base) {  in goldfish_tty_probe()
304 		pr_err("goldfish_tty: Unable to ioremap base!\n");  in goldfish_tty_probe()
305 		return -ENOMEM;  in goldfish_tty_probe()
316 	if (pdev->id == PLATFORM_DEVID_NONE)  in goldfish_tty_probe()
319 		line = pdev->id;  in goldfish_tty_probe()
324 		ret = -ENOMEM;  in goldfish_tty_probe()
336 	spin_lock_init(&qtty->lock);  in goldfish_tty_probe()
337 	tty_port_init(&qtty->port);  in goldfish_tty_probe()
338 	qtty->port.ops = &goldfish_port_ops;  in goldfish_tty_probe()
339 	qtty->base = base;  in goldfish_tty_probe()
340 	qtty->irq = irq;  in goldfish_tty_probe()
341 	qtty->dev = &pdev->dev;  in goldfish_tty_probe()
350 	qtty->version = gf_ioread32(base + GOLDFISH_TTY_REG_VERSION);  in goldfish_tty_probe()
356 	if (qtty->version > 0) {  in goldfish_tty_probe()
358 		 * Initialize dma_mask to 32-bits.  in goldfish_tty_probe()
360 		if (!pdev->dev.dma_mask)  in goldfish_tty_probe()
361 			pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;  in goldfish_tty_probe()
362 		ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));  in goldfish_tty_probe()
364 			dev_err(&pdev->dev, "No suitable DMA available.\n");  in goldfish_tty_probe()
369 	gf_iowrite32(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_REG_CMD);  in goldfish_tty_probe()
378 	ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,  in goldfish_tty_probe()
379 					  line, &pdev->dev);  in goldfish_tty_probe()
385 	strcpy(qtty->console.name, "ttyGF");  in goldfish_tty_probe()
386 	qtty->console.write = goldfish_tty_console_write;  in goldfish_tty_probe()
387 	qtty->console.device = goldfish_tty_console_device;  in goldfish_tty_probe()
388 	qtty->console.setup = goldfish_tty_console_setup;  in goldfish_tty_probe()
389 	qtty->console.flags = CON_PRINTBUFFER;  in goldfish_tty_probe()
390 	qtty->console.index = line;  in goldfish_tty_probe()
391 	register_console(&qtty->console);  in goldfish_tty_probe()
400 	tty_port_destroy(&qtty->port);  in goldfish_tty_probe()
401 	goldfish_tty_current_line_count--;  in goldfish_tty_probe()
407 	iounmap(base);  in goldfish_tty_probe()
417 	unregister_console(&qtty->console);  in goldfish_tty_remove()
418 	tty_unregister_device(goldfish_tty_driver, qtty->console.index);  in goldfish_tty_remove()
419 	iounmap(qtty->base);  in goldfish_tty_remove()
420 	qtty->base = NULL;  in goldfish_tty_remove()
421 	free_irq(qtty->irq, qtty);  in goldfish_tty_remove()
422 	tty_port_destroy(&qtty->port);  in goldfish_tty_remove()
423 	goldfish_tty_current_line_count--;  in goldfish_tty_remove()
431 static void gf_early_console_putchar(struct uart_port *port, unsigned char ch)  in gf_early_console_putchar()  argument
433 	gf_iowrite32(ch, port->membase);  in gf_early_console_putchar()
438 	struct earlycon_device *dev = con->data;  in gf_early_write()
440 	uart_console_write(&dev->port, s, n, gf_early_console_putchar);  in gf_early_write()
446 	if (!device->port.membase)  in gf_earlycon_setup()
447 		return -ENODEV;  in gf_earlycon_setup()
449 	device->con->write = gf_early_write;  in gf_earlycon_setup()
453 OF_EARLYCON_DECLARE(early_gf_tty, "google,goldfish-tty", gf_earlycon_setup);
457 	{ .compatible = "google,goldfish-tty", },