Lines Matching +full:- +full:uart
1 // SPDX-License-Identifier: GPL-2.0
3 * timbuart.c timberdale FPGA UART driver
8 * Timberdale FPGA UART
42 u32 ier = ioread32(port->membase + TIMBUART_IER) & ~RXFLAGS; in timbuart_stop_rx()
43 iowrite32(ier, port->membase + TIMBUART_IER); in timbuart_stop_rx()
49 u32 ier = ioread32(port->membase + TIMBUART_IER) & ~TXBAE; in timbuart_stop_tx()
50 iowrite32(ier, port->membase + TIMBUART_IER); in timbuart_stop_tx()
55 struct timbuart_port *uart = in timbuart_start_tx() local
58 /* do not transfer anything here -> fire off the tasklet */ in timbuart_start_tx()
59 tasklet_schedule(&uart->tasklet); in timbuart_start_tx()
64 u32 isr = ioread32(port->membase + TIMBUART_ISR); in timbuart_tx_empty()
72 u8 ctl = ioread8(port->membase + TIMBUART_CTRL) | in timbuart_flush_buffer()
75 iowrite8(ctl, port->membase + TIMBUART_CTRL); in timbuart_flush_buffer()
76 iowrite32(TXBF, port->membase + TIMBUART_ISR); in timbuart_flush_buffer()
82 struct tty_port *tport = &port->state->port; in timbuart_rx_chars()
84 while (ioread32(port->membase + TIMBUART_ISR) & RXDP) { in timbuart_rx_chars()
85 u8 ch = ioread8(port->membase + TIMBUART_RXFIFO); in timbuart_rx_chars()
86 port->icount.rx++; in timbuart_rx_chars()
92 dev_dbg(port->dev, "%s - total read %d bytes\n", in timbuart_rx_chars()
93 __func__, port->icount.rx); in timbuart_rx_chars()
98 struct circ_buf *xmit = &port->state->xmit; in timbuart_tx_chars()
100 while (!(ioread32(port->membase + TIMBUART_ISR) & TXBF) && in timbuart_tx_chars()
102 iowrite8(xmit->buf[xmit->tail], in timbuart_tx_chars()
103 port->membase + TIMBUART_TXFIFO); in timbuart_tx_chars()
104 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); in timbuart_tx_chars()
105 port->icount.tx++; in timbuart_tx_chars()
108 dev_dbg(port->dev, in timbuart_tx_chars()
109 "%s - total written %d bytes, CTL: %x, RTS: %x, baud: %x\n", in timbuart_tx_chars()
111 port->icount.tx, in timbuart_tx_chars()
112 ioread8(port->membase + TIMBUART_CTRL), in timbuart_tx_chars()
113 port->mctrl & TIOCM_RTS, in timbuart_tx_chars()
114 ioread8(port->membase + TIMBUART_BAUDRATE)); in timbuart_tx_chars()
119 struct timbuart_port *uart = in timbuart_handle_tx_port() local
121 struct circ_buf *xmit = &port->state->xmit; in timbuart_handle_tx_port()
126 if (port->x_char) in timbuart_handle_tx_port()
132 iowrite32(TXFLAGS, port->membase + TIMBUART_ISR); in timbuart_handle_tx_port()
137 /* Re-enable any tx interrupt */ in timbuart_handle_tx_port()
138 *ier |= uart->last_ier & TXFLAGS; in timbuart_handle_tx_port()
148 dev_dbg(port->dev, "%s - leaving\n", __func__); in timbuart_handle_tx_port()
156 u8 ctl = ioread8(port->membase + TIMBUART_CTRL) | in timbuart_handle_rx_port()
158 iowrite8(ctl, port->membase + TIMBUART_CTRL); in timbuart_handle_rx_port()
159 port->icount.overrun++; in timbuart_handle_rx_port()
164 iowrite32(RXFLAGS, port->membase + TIMBUART_ISR); in timbuart_handle_rx_port()
170 dev_dbg(port->dev, "%s - leaving\n", __func__); in timbuart_handle_rx_port()
175 struct timbuart_port *uart = from_tasklet(uart, t, tasklet); in timbuart_tasklet() local
178 spin_lock(&uart->port.lock); in timbuart_tasklet()
180 isr = ioread32(uart->port.membase + TIMBUART_ISR); in timbuart_tasklet()
181 dev_dbg(uart->port.dev, "%s ISR: %x\n", __func__, isr); in timbuart_tasklet()
183 if (!uart->usedma) in timbuart_tasklet()
184 timbuart_handle_tx_port(&uart->port, isr, &ier); in timbuart_tasklet()
186 timbuart_mctrl_check(&uart->port, isr, &ier); in timbuart_tasklet()
188 if (!uart->usedma) in timbuart_tasklet()
189 timbuart_handle_rx_port(&uart->port, isr, &ier); in timbuart_tasklet()
191 iowrite32(ier, uart->port.membase + TIMBUART_IER); in timbuart_tasklet()
193 spin_unlock(&uart->port.lock); in timbuart_tasklet()
194 dev_dbg(uart->port.dev, "%s leaving\n", __func__); in timbuart_tasklet()
199 u8 cts = ioread8(port->membase + TIMBUART_CTRL); in timbuart_get_mctrl()
200 dev_dbg(port->dev, "%s - cts %x\n", __func__, cts); in timbuart_get_mctrl()
210 dev_dbg(port->dev, "%s - %x\n", __func__, mctrl); in timbuart_set_mctrl()
213 iowrite8(TIMBUART_CTRL_RTS, port->membase + TIMBUART_CTRL); in timbuart_set_mctrl()
215 iowrite8(0, port->membase + TIMBUART_CTRL); in timbuart_set_mctrl()
224 iowrite32(CTS_DELTA, port->membase + TIMBUART_ISR); in timbuart_mctrl_check()
227 wake_up_interruptible(&port->state->port.delta_msr_wait); in timbuart_mctrl_check()
240 struct timbuart_port *uart = in timbuart_startup() local
243 dev_dbg(port->dev, "%s\n", __func__); in timbuart_startup()
245 iowrite8(TIMBUART_CTRL_FLSHRX, port->membase + TIMBUART_CTRL); in timbuart_startup()
246 iowrite32(0x1ff, port->membase + TIMBUART_ISR); in timbuart_startup()
249 port->membase + TIMBUART_IER); in timbuart_startup()
251 return request_irq(port->irq, timbuart_handleinterrupt, IRQF_SHARED, in timbuart_startup()
252 "timb-uart", uart); in timbuart_startup()
257 struct timbuart_port *uart = in timbuart_shutdown() local
259 dev_dbg(port->dev, "%s\n", __func__); in timbuart_shutdown()
260 free_irq(port->irq, uart); in timbuart_shutdown()
261 iowrite32(0, port->membase + TIMBUART_IER); in timbuart_shutdown()
274 return -1; in get_bindex()
285 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); in timbuart_set_termios()
287 dev_dbg(port->dev, "%s - bindex %d\n", __func__, bindex); in timbuart_set_termios()
299 spin_lock_irqsave(&port->lock, flags); in timbuart_set_termios()
300 iowrite8((u8)bindex, port->membase + TIMBUART_BAUDRATE); in timbuart_set_termios()
301 uart_update_timeout(port, termios->c_cflag, baud); in timbuart_set_termios()
302 spin_unlock_irqrestore(&port->lock, flags); in timbuart_set_termios()
307 return port->type == PORT_UNKNOWN ? "timbuart" : NULL; in timbuart_type()
315 struct platform_device *pdev = to_platform_device(port->dev); in timbuart_release_port()
319 if (port->flags & UPF_IOREMAP) { in timbuart_release_port()
320 iounmap(port->membase); in timbuart_release_port()
321 port->membase = NULL; in timbuart_release_port()
324 release_mem_region(port->mapbase, size); in timbuart_release_port()
329 struct platform_device *pdev = to_platform_device(port->dev); in timbuart_request_port()
333 if (!request_mem_region(port->mapbase, size, "timb-uart")) in timbuart_request_port()
334 return -EBUSY; in timbuart_request_port()
336 if (port->flags & UPF_IOREMAP) { in timbuart_request_port()
337 port->membase = ioremap(port->mapbase, size); in timbuart_request_port()
338 if (port->membase == NULL) { in timbuart_request_port()
339 release_mem_region(port->mapbase, size); in timbuart_request_port()
340 return -ENOMEM; in timbuart_request_port()
349 struct timbuart_port *uart = (struct timbuart_port *)devid; in timbuart_handleinterrupt() local
351 if (ioread8(uart->port.membase + TIMBUART_IPR)) { in timbuart_handleinterrupt()
352 uart->last_ier = ioread32(uart->port.membase + TIMBUART_IER); in timbuart_handleinterrupt()
355 iowrite32(0, uart->port.membase + TIMBUART_IER); in timbuart_handleinterrupt()
358 tasklet_schedule(&uart->tasklet); in timbuart_handleinterrupt()
371 port->type = PORT_TIMBUART; in timbuart_config_port()
380 return -EINVAL; in timbuart_verify_port()
414 struct timbuart_port *uart; in timbuart_probe() local
417 dev_dbg(&dev->dev, "%s\n", __func__); in timbuart_probe()
419 uart = kzalloc(sizeof(*uart), GFP_KERNEL); in timbuart_probe()
420 if (!uart) { in timbuart_probe()
421 err = -EINVAL; in timbuart_probe()
425 uart->usedma = 0; in timbuart_probe()
427 uart->port.uartclk = 3250000 * 16; in timbuart_probe()
428 uart->port.fifosize = TIMBUART_FIFO_SIZE; in timbuart_probe()
429 uart->port.regshift = 2; in timbuart_probe()
430 uart->port.iotype = UPIO_MEM; in timbuart_probe()
431 uart->port.ops = &timbuart_ops; in timbuart_probe()
432 uart->port.irq = 0; in timbuart_probe()
433 uart->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP; in timbuart_probe()
434 uart->port.line = 0; in timbuart_probe()
435 uart->port.dev = &dev->dev; in timbuart_probe()
439 err = -ENOMEM; in timbuart_probe()
442 uart->port.mapbase = iomem->start; in timbuart_probe()
443 uart->port.membase = NULL; in timbuart_probe()
447 err = -EINVAL; in timbuart_probe()
450 uart->port.irq = irq; in timbuart_probe()
452 tasklet_setup(&uart->tasklet, timbuart_tasklet); in timbuart_probe()
458 err = uart_add_one_port(&timbuart_driver, &uart->port); in timbuart_probe()
462 platform_set_drvdata(dev, uart); in timbuart_probe()
469 kfree(uart); in timbuart_probe()
471 printk(KERN_ERR "timberdale: Failed to register Timberdale UART: %d\n", in timbuart_probe()
479 struct timbuart_port *uart = platform_get_drvdata(dev); in timbuart_remove() local
481 tasklet_kill(&uart->tasklet); in timbuart_remove()
482 uart_remove_one_port(&timbuart_driver, &uart->port); in timbuart_remove()
484 kfree(uart); in timbuart_remove()
491 .name = "timb-uart",
499 MODULE_DESCRIPTION("Timberdale UART driver");
501 MODULE_ALIAS("platform:timb-uart");