1 // SPDX-License-Identifier: GPL-2.0+
3 * RDA8810PL serial device driver
5 * Copyright RDA Microelectronics Company Limited
6 * Copyright (c) 2017 Andreas Färber
7 * Copyright (c) 2018 Manivannan Sadhasivam
10 #include <linux/clk.h>
11 #include <linux/console.h>
12 #include <linux/delay.h>
14 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/serial.h>
18 #include <linux/serial_core.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
22 #define RDA_UART_PORT_NUM 3
23 #define RDA_UART_DEV_NAME "ttyRDA"
25 #define RDA_UART_CTRL 0x00
26 #define RDA_UART_STATUS 0x04
27 #define RDA_UART_RXTX_BUFFER 0x08
28 #define RDA_UART_IRQ_MASK 0x0c
29 #define RDA_UART_IRQ_CAUSE 0x10
30 #define RDA_UART_IRQ_TRIGGERS 0x14
31 #define RDA_UART_CMD_SET 0x18
32 #define RDA_UART_CMD_CLR 0x1c
35 #define RDA_UART_ENABLE BIT(0)
36 #define RDA_UART_DBITS_8 BIT(1)
37 #define RDA_UART_TX_SBITS_2 BIT(2)
38 #define RDA_UART_PARITY_EN BIT(3)
39 #define RDA_UART_PARITY(x) (((x) & 0x3) << 4)
40 #define RDA_UART_PARITY_ODD RDA_UART_PARITY(0)
41 #define RDA_UART_PARITY_EVEN RDA_UART_PARITY(1)
42 #define RDA_UART_PARITY_SPACE RDA_UART_PARITY(2)
43 #define RDA_UART_PARITY_MARK RDA_UART_PARITY(3)
44 #define RDA_UART_DIV_MODE BIT(20)
45 #define RDA_UART_IRDA_EN BIT(21)
46 #define RDA_UART_DMA_EN BIT(22)
47 #define RDA_UART_FLOW_CNT_EN BIT(23)
48 #define RDA_UART_LOOP_BACK_EN BIT(24)
49 #define RDA_UART_RX_LOCK_ERR BIT(25)
50 #define RDA_UART_RX_BREAK_LEN(x) (((x) & 0xf) << 28)
52 /* UART_STATUS Bits */
53 #define RDA_UART_RX_FIFO(x) (((x) & 0x7f) << 0)
54 #define RDA_UART_RX_FIFO_MASK (0x7f << 0)
55 #define RDA_UART_TX_FIFO(x) (((x) & 0x1f) << 8)
56 #define RDA_UART_TX_FIFO_MASK (0x1f << 8)
57 #define RDA_UART_TX_ACTIVE BIT(14)
58 #define RDA_UART_RX_ACTIVE BIT(15)
59 #define RDA_UART_RX_OVERFLOW_ERR BIT(16)
60 #define RDA_UART_TX_OVERFLOW_ERR BIT(17)
61 #define RDA_UART_RX_PARITY_ERR BIT(18)
62 #define RDA_UART_RX_FRAMING_ERR BIT(19)
63 #define RDA_UART_RX_BREAK_INT BIT(20)
64 #define RDA_UART_DCTS BIT(24)
65 #define RDA_UART_CTS BIT(25)
66 #define RDA_UART_DTR BIT(28)
67 #define RDA_UART_CLK_ENABLED BIT(31)
69 /* UART_RXTX_BUFFER Bits */
70 #define RDA_UART_RX_DATA(x) (((x) & 0xff) << 0)
71 #define RDA_UART_TX_DATA(x) (((x) & 0xff) << 0)
73 /* UART_IRQ_MASK Bits */
74 #define RDA_UART_TX_MODEM_STATUS BIT(0)
75 #define RDA_UART_RX_DATA_AVAILABLE BIT(1)
76 #define RDA_UART_TX_DATA_NEEDED BIT(2)
77 #define RDA_UART_RX_TIMEOUT BIT(3)
78 #define RDA_UART_RX_LINE_ERR BIT(4)
79 #define RDA_UART_TX_DMA_DONE BIT(5)
80 #define RDA_UART_RX_DMA_DONE BIT(6)
81 #define RDA_UART_RX_DMA_TIMEOUT BIT(7)
82 #define RDA_UART_DTR_RISE BIT(8)
83 #define RDA_UART_DTR_FALL BIT(9)
85 /* UART_IRQ_CAUSE Bits */
86 #define RDA_UART_TX_MODEM_STATUS_U BIT(16)
87 #define RDA_UART_RX_DATA_AVAILABLE_U BIT(17)
88 #define RDA_UART_TX_DATA_NEEDED_U BIT(18)
89 #define RDA_UART_RX_TIMEOUT_U BIT(19)
90 #define RDA_UART_RX_LINE_ERR_U BIT(20)
91 #define RDA_UART_TX_DMA_DONE_U BIT(21)
92 #define RDA_UART_RX_DMA_DONE_U BIT(22)
93 #define RDA_UART_RX_DMA_TIMEOUT_U BIT(23)
94 #define RDA_UART_DTR_RISE_U BIT(24)
95 #define RDA_UART_DTR_FALL_U BIT(25)
97 /* UART_TRIGGERS Bits */
98 #define RDA_UART_RX_TRIGGER(x) (((x) & 0x1f) << 0)
99 #define RDA_UART_TX_TRIGGER(x) (((x) & 0xf) << 8)
100 #define RDA_UART_AFC_LEVEL(x) (((x) & 0x1f) << 16)
102 /* UART_CMD_SET Bits */
103 #define RDA_UART_RI BIT(0)
104 #define RDA_UART_DCD BIT(1)
105 #define RDA_UART_DSR BIT(2)
106 #define RDA_UART_TX_BREAK_CONTROL BIT(3)
107 #define RDA_UART_TX_FINISH_N_WAIT BIT(4)
108 #define RDA_UART_RTS BIT(5)
109 #define RDA_UART_RX_FIFO_RESET BIT(6)
110 #define RDA_UART_TX_FIFO_RESET BIT(7)
112 #define RDA_UART_TX_FIFO_SIZE 16
114 static struct uart_driver rda_uart_driver;
116 struct rda_uart_port {
117 struct uart_port port;
121 #define to_rda_uart_port(port) container_of(port, struct rda_uart_port, port)
123 static struct rda_uart_port *rda_uart_ports[RDA_UART_PORT_NUM];
125 static inline void rda_uart_write(struct uart_port *port, u32 val,
128 writel(val, port->membase + off);
131 static inline u32 rda_uart_read(struct uart_port *port, unsigned int off)
133 return readl(port->membase + off);
136 static unsigned int rda_uart_tx_empty(struct uart_port *port)
142 spin_lock_irqsave(&port->lock, flags);
144 val = rda_uart_read(port, RDA_UART_STATUS);
145 ret = (val & RDA_UART_TX_FIFO_MASK) ? TIOCSER_TEMT : 0;
147 spin_unlock_irqrestore(&port->lock, flags);
152 static unsigned int rda_uart_get_mctrl(struct uart_port *port)
154 unsigned int mctrl = 0;
157 cmd_set = rda_uart_read(port, RDA_UART_CMD_SET);
158 status = rda_uart_read(port, RDA_UART_STATUS);
159 if (cmd_set & RDA_UART_RTS)
161 if (!(status & RDA_UART_CTS))
167 static void rda_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
171 if (mctrl & TIOCM_RTS) {
172 val = rda_uart_read(port, RDA_UART_CMD_SET);
173 rda_uart_write(port, (val | RDA_UART_RTS), RDA_UART_CMD_SET);
175 /* Clear RTS to stop to receive. */
176 val = rda_uart_read(port, RDA_UART_CMD_CLR);
177 rda_uart_write(port, (val | RDA_UART_RTS), RDA_UART_CMD_CLR);
180 val = rda_uart_read(port, RDA_UART_CTRL);
182 if (mctrl & TIOCM_LOOP)
183 val |= RDA_UART_LOOP_BACK_EN;
185 val &= ~RDA_UART_LOOP_BACK_EN;
187 rda_uart_write(port, val, RDA_UART_CTRL);
190 static void rda_uart_stop_tx(struct uart_port *port)
194 val = rda_uart_read(port, RDA_UART_IRQ_MASK);
195 val &= ~RDA_UART_TX_DATA_NEEDED;
196 rda_uart_write(port, val, RDA_UART_IRQ_MASK);
198 val = rda_uart_read(port, RDA_UART_CMD_SET);
199 val |= RDA_UART_TX_FIFO_RESET;
200 rda_uart_write(port, val, RDA_UART_CMD_SET);
203 static void rda_uart_stop_rx(struct uart_port *port)
207 val = rda_uart_read(port, RDA_UART_IRQ_MASK);
208 val &= ~(RDA_UART_RX_DATA_AVAILABLE | RDA_UART_RX_TIMEOUT);
209 rda_uart_write(port, val, RDA_UART_IRQ_MASK);
211 /* Read Rx buffer before reset to avoid Rx timeout interrupt */
212 val = rda_uart_read(port, RDA_UART_RXTX_BUFFER);
214 val = rda_uart_read(port, RDA_UART_CMD_SET);
215 val |= RDA_UART_RX_FIFO_RESET;
216 rda_uart_write(port, val, RDA_UART_CMD_SET);
219 static void rda_uart_start_tx(struct uart_port *port)
223 if (uart_tx_stopped(port)) {
224 rda_uart_stop_tx(port);
228 val = rda_uart_read(port, RDA_UART_IRQ_MASK);
229 val |= RDA_UART_TX_DATA_NEEDED;
230 rda_uart_write(port, val, RDA_UART_IRQ_MASK);
233 static void rda_uart_change_baudrate(struct rda_uart_port *rda_port,
236 clk_set_rate(rda_port->clk, baud * 8);
239 static void rda_uart_set_termios(struct uart_port *port,
240 struct ktermios *termios,
241 struct ktermios *old)
243 struct rda_uart_port *rda_port = to_rda_uart_port(port);
245 unsigned int ctrl, cmd_set, cmd_clr, triggers;
249 spin_lock_irqsave(&port->lock, flags);
251 baud = uart_get_baud_rate(port, termios, old, 9600, port->uartclk / 4);
252 rda_uart_change_baudrate(rda_port, baud);
254 ctrl = rda_uart_read(port, RDA_UART_CTRL);
255 cmd_set = rda_uart_read(port, RDA_UART_CMD_SET);
256 cmd_clr = rda_uart_read(port, RDA_UART_CMD_CLR);
258 switch (termios->c_cflag & CSIZE) {
261 dev_warn(port->dev, "bit size not supported, using 7 bits\n");
264 ctrl &= ~RDA_UART_DBITS_8;
265 termios->c_cflag &= ~CSIZE;
266 termios->c_cflag |= CS7;
269 ctrl |= RDA_UART_DBITS_8;
274 if (termios->c_cflag & CSTOPB)
275 ctrl |= RDA_UART_TX_SBITS_2;
277 ctrl &= ~RDA_UART_TX_SBITS_2;
280 if (termios->c_cflag & PARENB) {
281 ctrl |= RDA_UART_PARITY_EN;
283 /* Mark or Space parity */
284 if (termios->c_cflag & CMSPAR) {
285 if (termios->c_cflag & PARODD)
286 ctrl |= RDA_UART_PARITY_MARK;
288 ctrl |= RDA_UART_PARITY_SPACE;
289 } else if (termios->c_cflag & PARODD) {
290 ctrl |= RDA_UART_PARITY_ODD;
292 ctrl |= RDA_UART_PARITY_EVEN;
295 ctrl &= ~RDA_UART_PARITY_EN;
298 /* Hardware handshake (RTS/CTS) */
299 if (termios->c_cflag & CRTSCTS) {
300 ctrl |= RDA_UART_FLOW_CNT_EN;
301 cmd_set |= RDA_UART_RTS;
303 ctrl &= ~RDA_UART_FLOW_CNT_EN;
304 cmd_clr |= RDA_UART_RTS;
307 ctrl |= RDA_UART_ENABLE;
308 ctrl &= ~RDA_UART_DMA_EN;
310 triggers = (RDA_UART_AFC_LEVEL(20) | RDA_UART_RX_TRIGGER(16));
311 irq_mask = rda_uart_read(port, RDA_UART_IRQ_MASK);
312 rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
314 rda_uart_write(port, triggers, RDA_UART_IRQ_TRIGGERS);
315 rda_uart_write(port, ctrl, RDA_UART_CTRL);
316 rda_uart_write(port, cmd_set, RDA_UART_CMD_SET);
317 rda_uart_write(port, cmd_clr, RDA_UART_CMD_CLR);
319 rda_uart_write(port, irq_mask, RDA_UART_IRQ_MASK);
321 /* Don't rewrite B0 */
322 if (tty_termios_baud_rate(termios))
323 tty_termios_encode_baud_rate(termios, baud, baud);
325 /* update the per-port timeout */
326 uart_update_timeout(port, termios->c_cflag, baud);
328 spin_unlock_irqrestore(&port->lock, flags);
331 static void rda_uart_send_chars(struct uart_port *port)
333 struct circ_buf *xmit = &port->state->xmit;
337 if (uart_tx_stopped(port))
341 while (!(rda_uart_read(port, RDA_UART_STATUS) &
342 RDA_UART_TX_FIFO_MASK))
345 rda_uart_write(port, port->x_char, RDA_UART_RXTX_BUFFER);
350 while (rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK) {
351 if (uart_circ_empty(xmit))
354 ch = xmit->buf[xmit->tail];
355 rda_uart_write(port, ch, RDA_UART_RXTX_BUFFER);
356 xmit->tail = (xmit->tail + 1) & (SERIAL_XMIT_SIZE - 1);
360 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
361 uart_write_wakeup(port);
363 if (!uart_circ_empty(xmit)) {
364 /* Re-enable Tx FIFO interrupt */
365 val = rda_uart_read(port, RDA_UART_IRQ_MASK);
366 val |= RDA_UART_TX_DATA_NEEDED;
367 rda_uart_write(port, val, RDA_UART_IRQ_MASK);
371 static void rda_uart_receive_chars(struct uart_port *port)
375 status = rda_uart_read(port, RDA_UART_STATUS);
376 while ((status & RDA_UART_RX_FIFO_MASK)) {
377 char flag = TTY_NORMAL;
379 if (status & RDA_UART_RX_PARITY_ERR) {
380 port->icount.parity++;
384 if (status & RDA_UART_RX_FRAMING_ERR) {
385 port->icount.frame++;
389 if (status & RDA_UART_RX_OVERFLOW_ERR) {
390 port->icount.overrun++;
394 val = rda_uart_read(port, RDA_UART_RXTX_BUFFER);
398 tty_insert_flip_char(&port->state->port, val, flag);
400 status = rda_uart_read(port, RDA_UART_STATUS);
403 spin_unlock(&port->lock);
404 tty_flip_buffer_push(&port->state->port);
405 spin_lock(&port->lock);
408 static irqreturn_t rda_interrupt(int irq, void *dev_id)
410 struct uart_port *port = dev_id;
414 spin_lock_irqsave(&port->lock, flags);
416 /* Clear IRQ cause */
417 val = rda_uart_read(port, RDA_UART_IRQ_CAUSE);
418 rda_uart_write(port, val, RDA_UART_IRQ_CAUSE);
420 if (val & (RDA_UART_RX_DATA_AVAILABLE | RDA_UART_RX_TIMEOUT))
421 rda_uart_receive_chars(port);
423 if (val & (RDA_UART_TX_DATA_NEEDED)) {
424 irq_mask = rda_uart_read(port, RDA_UART_IRQ_MASK);
425 irq_mask &= ~RDA_UART_TX_DATA_NEEDED;
426 rda_uart_write(port, irq_mask, RDA_UART_IRQ_MASK);
428 rda_uart_send_chars(port);
431 spin_unlock_irqrestore(&port->lock, flags);
436 static int rda_uart_startup(struct uart_port *port)
442 spin_lock_irqsave(&port->lock, flags);
443 rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
444 spin_unlock_irqrestore(&port->lock, flags);
446 ret = request_irq(port->irq, rda_interrupt, IRQF_NO_SUSPEND,
451 spin_lock_irqsave(&port->lock, flags);
453 val = rda_uart_read(port, RDA_UART_CTRL);
454 val |= RDA_UART_ENABLE;
455 rda_uart_write(port, val, RDA_UART_CTRL);
457 /* enable rx interrupt */
458 val = rda_uart_read(port, RDA_UART_IRQ_MASK);
459 val |= (RDA_UART_RX_DATA_AVAILABLE | RDA_UART_RX_TIMEOUT);
460 rda_uart_write(port, val, RDA_UART_IRQ_MASK);
462 spin_unlock_irqrestore(&port->lock, flags);
467 static void rda_uart_shutdown(struct uart_port *port)
472 spin_lock_irqsave(&port->lock, flags);
474 rda_uart_stop_tx(port);
475 rda_uart_stop_rx(port);
477 val = rda_uart_read(port, RDA_UART_CTRL);
478 val &= ~RDA_UART_ENABLE;
479 rda_uart_write(port, val, RDA_UART_CTRL);
481 spin_unlock_irqrestore(&port->lock, flags);
484 static const char *rda_uart_type(struct uart_port *port)
486 return (port->type == PORT_RDA) ? "rda-uart" : NULL;
489 static int rda_uart_request_port(struct uart_port *port)
491 struct platform_device *pdev = to_platform_device(port->dev);
492 struct resource *res;
494 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
498 if (!devm_request_mem_region(port->dev, port->mapbase,
499 resource_size(res), dev_name(port->dev)))
502 if (port->flags & UPF_IOREMAP) {
503 port->membase = devm_ioremap(port->dev, port->mapbase,
512 static void rda_uart_config_port(struct uart_port *port, int flags)
514 unsigned long irq_flags;
516 if (flags & UART_CONFIG_TYPE) {
517 port->type = PORT_RDA;
518 rda_uart_request_port(port);
521 spin_lock_irqsave(&port->lock, irq_flags);
523 /* Clear mask, so no surprise interrupts. */
524 rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
526 /* Clear status register */
527 rda_uart_write(port, 0, RDA_UART_STATUS);
529 spin_unlock_irqrestore(&port->lock, irq_flags);
532 static void rda_uart_release_port(struct uart_port *port)
534 struct platform_device *pdev = to_platform_device(port->dev);
535 struct resource *res;
537 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
541 if (port->flags & UPF_IOREMAP) {
542 devm_release_mem_region(port->dev, port->mapbase,
544 devm_iounmap(port->dev, port->membase);
545 port->membase = NULL;
549 static int rda_uart_verify_port(struct uart_port *port,
550 struct serial_struct *ser)
552 if (port->type != PORT_RDA)
555 if (port->irq != ser->irq)
561 static const struct uart_ops rda_uart_ops = {
562 .tx_empty = rda_uart_tx_empty,
563 .get_mctrl = rda_uart_get_mctrl,
564 .set_mctrl = rda_uart_set_mctrl,
565 .start_tx = rda_uart_start_tx,
566 .stop_tx = rda_uart_stop_tx,
567 .stop_rx = rda_uart_stop_rx,
568 .startup = rda_uart_startup,
569 .shutdown = rda_uart_shutdown,
570 .set_termios = rda_uart_set_termios,
571 .type = rda_uart_type,
572 .request_port = rda_uart_request_port,
573 .release_port = rda_uart_release_port,
574 .config_port = rda_uart_config_port,
575 .verify_port = rda_uart_verify_port,
578 #ifdef CONFIG_SERIAL_RDA_CONSOLE
580 static void rda_console_putchar(struct uart_port *port, int ch)
585 while (!(rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK))
588 rda_uart_write(port, ch, RDA_UART_RXTX_BUFFER);
591 static void rda_uart_port_write(struct uart_port *port, const char *s,
598 local_irq_save(flags);
602 } else if (oops_in_progress) {
603 locked = spin_trylock(&port->lock);
605 spin_lock(&port->lock);
609 old_irq_mask = rda_uart_read(port, RDA_UART_IRQ_MASK);
610 rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
612 uart_console_write(port, s, count, rda_console_putchar);
614 /* wait until all contents have been sent out */
615 while (!(rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK))
618 rda_uart_write(port, old_irq_mask, RDA_UART_IRQ_MASK);
621 spin_unlock(&port->lock);
623 local_irq_restore(flags);
626 static void rda_uart_console_write(struct console *co, const char *s,
629 struct rda_uart_port *rda_port;
631 rda_port = rda_uart_ports[co->index];
635 rda_uart_port_write(&rda_port->port, s, count);
638 static int rda_uart_console_setup(struct console *co, char *options)
640 struct rda_uart_port *rda_port;
646 if (co->index < 0 || co->index >= RDA_UART_PORT_NUM)
649 rda_port = rda_uart_ports[co->index];
650 if (!rda_port || !rda_port->port.membase)
654 uart_parse_options(options, &baud, &parity, &bits, &flow);
656 return uart_set_options(&rda_port->port, co, baud, parity, bits, flow);
659 static struct console rda_uart_console = {
660 .name = RDA_UART_DEV_NAME,
661 .write = rda_uart_console_write,
662 .device = uart_console_device,
663 .setup = rda_uart_console_setup,
664 .flags = CON_PRINTBUFFER,
666 .data = &rda_uart_driver,
669 static int __init rda_uart_console_init(void)
671 register_console(&rda_uart_console);
675 console_initcall(rda_uart_console_init);
677 static void rda_uart_early_console_write(struct console *co,
681 struct earlycon_device *dev = co->data;
683 rda_uart_port_write(&dev->port, s, count);
687 rda_uart_early_console_setup(struct earlycon_device *device, const char *opt)
689 if (!device->port.membase)
692 device->con->write = rda_uart_early_console_write;
697 OF_EARLYCON_DECLARE(rda, "rda,8810pl-uart",
698 rda_uart_early_console_setup);
700 #define RDA_UART_CONSOLE (&rda_uart_console)
702 #define RDA_UART_CONSOLE NULL
703 #endif /* CONFIG_SERIAL_RDA_CONSOLE */
705 static struct uart_driver rda_uart_driver = {
706 .owner = THIS_MODULE,
707 .driver_name = "rda-uart",
708 .dev_name = RDA_UART_DEV_NAME,
709 .nr = RDA_UART_PORT_NUM,
710 .cons = RDA_UART_CONSOLE,
713 static const struct of_device_id rda_uart_dt_matches[] = {
714 { .compatible = "rda,8810pl-uart" },
717 MODULE_DEVICE_TABLE(of, rda_uart_dt_matches);
719 static int rda_uart_probe(struct platform_device *pdev)
721 struct resource *res_mem;
722 struct rda_uart_port *rda_port;
725 if (pdev->dev.of_node)
726 pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");
728 if (pdev->id < 0 || pdev->id >= RDA_UART_PORT_NUM) {
729 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
733 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
735 dev_err(&pdev->dev, "could not get mem\n");
739 irq = platform_get_irq(pdev, 0);
743 if (rda_uart_ports[pdev->id]) {
744 dev_err(&pdev->dev, "port %d already allocated\n", pdev->id);
748 rda_port = devm_kzalloc(&pdev->dev, sizeof(*rda_port), GFP_KERNEL);
752 rda_port->clk = devm_clk_get(&pdev->dev, NULL);
753 if (IS_ERR(rda_port->clk)) {
754 dev_err(&pdev->dev, "could not get clk\n");
755 return PTR_ERR(rda_port->clk);
758 rda_port->port.dev = &pdev->dev;
759 rda_port->port.regshift = 0;
760 rda_port->port.line = pdev->id;
761 rda_port->port.type = PORT_RDA;
762 rda_port->port.iotype = UPIO_MEM;
763 rda_port->port.mapbase = res_mem->start;
764 rda_port->port.irq = irq;
765 rda_port->port.uartclk = clk_get_rate(rda_port->clk);
766 if (rda_port->port.uartclk == 0) {
767 dev_err(&pdev->dev, "clock rate is zero\n");
770 rda_port->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP |
772 rda_port->port.x_char = 0;
773 rda_port->port.fifosize = RDA_UART_TX_FIFO_SIZE;
774 rda_port->port.ops = &rda_uart_ops;
776 rda_uart_ports[pdev->id] = rda_port;
777 platform_set_drvdata(pdev, rda_port);
779 ret = uart_add_one_port(&rda_uart_driver, &rda_port->port);
781 rda_uart_ports[pdev->id] = NULL;
786 static int rda_uart_remove(struct platform_device *pdev)
788 struct rda_uart_port *rda_port = platform_get_drvdata(pdev);
790 uart_remove_one_port(&rda_uart_driver, &rda_port->port);
791 rda_uart_ports[pdev->id] = NULL;
796 static struct platform_driver rda_uart_platform_driver = {
797 .probe = rda_uart_probe,
798 .remove = rda_uart_remove,
801 .of_match_table = rda_uart_dt_matches,
805 static int __init rda_uart_init(void)
809 ret = uart_register_driver(&rda_uart_driver);
813 ret = platform_driver_register(&rda_uart_platform_driver);
815 uart_unregister_driver(&rda_uart_driver);
820 static void __exit rda_uart_exit(void)
822 platform_driver_unregister(&rda_uart_platform_driver);
823 uart_unregister_driver(&rda_uart_driver);
826 module_init(rda_uart_init);
827 module_exit(rda_uart_exit);
829 MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
830 MODULE_DESCRIPTION("RDA8810PL serial device driver");
831 MODULE_LICENSE("GPL");