2 * Driver core for Samsung SoC onboard UARTs.
4 * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
5 * http://armlinux.simtec.co.uk/
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 /* Hote on 2410 error handling
14 * The s3c2410 manual has a love/hate affair with the contents of the
15 * UERSTAT register in the UART blocks, and keeps marking some of the
16 * error bits as reserved. Having checked with the s3c2410x01,
17 * it copes with BREAKs properly, so I am happy to ignore the RESERVED
18 * feature from the latter versions of the manual.
20 * If it becomes aparrent that latter versions of the 2410 remove these
21 * bits, then action will have to be taken to differentiate the versions
22 * and change the policy on BREAK
27 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
31 #include <linux/dmaengine.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/slab.h>
34 #include <linux/module.h>
35 #include <linux/ioport.h>
37 #include <linux/platform_device.h>
38 #include <linux/init.h>
39 #include <linux/sysrq.h>
40 #include <linux/console.h>
41 #include <linux/tty.h>
42 #include <linux/tty_flip.h>
43 #include <linux/serial_core.h>
44 #include <linux/serial.h>
45 #include <linux/serial_s3c.h>
46 #include <linux/delay.h>
47 #include <linux/clk.h>
48 #include <linux/cpufreq.h>
55 #if defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \
58 extern void printascii(const char *);
61 static void dbg(const char *fmt, ...)
67 vscnprintf(buff, sizeof(buff), fmt, va);
74 #define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0)
77 /* UART name and device definitions */
79 #define S3C24XX_SERIAL_NAME "ttySAC"
80 #define S3C24XX_SERIAL_MAJOR 204
81 #define S3C24XX_SERIAL_MINOR 64
83 #define S3C24XX_TX_PIO 1
84 #define S3C24XX_TX_DMA 2
85 #define S3C24XX_RX_PIO 1
86 #define S3C24XX_RX_DMA 2
87 /* macros to change one thing to another */
89 #define tx_enabled(port) ((port)->unused[0])
90 #define rx_enabled(port) ((port)->unused[1])
92 /* flag to ignore all characters coming in */
93 #define RXSTAT_DUMMY_READ (0x10000000)
95 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
97 return container_of(port, struct s3c24xx_uart_port, port);
100 /* translate a port to the device name */
102 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
104 return to_platform_device(port->dev)->name;
107 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
109 return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
113 * s3c64xx and later SoC's include the interrupt mask and status registers in
114 * the controller itself, unlike the s3c24xx SoC's which have these registers
115 * in the interrupt controller. Check if the port type is s3c64xx or higher.
117 static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
119 return to_ourport(port)->info->type == PORT_S3C6400;
122 static void s3c24xx_serial_rx_enable(struct uart_port *port)
125 unsigned int ucon, ufcon;
128 spin_lock_irqsave(&port->lock, flags);
130 while (--count && !s3c24xx_serial_txempty_nofifo(port))
133 ufcon = rd_regl(port, S3C2410_UFCON);
134 ufcon |= S3C2410_UFCON_RESETRX;
135 wr_regl(port, S3C2410_UFCON, ufcon);
137 ucon = rd_regl(port, S3C2410_UCON);
138 ucon |= S3C2410_UCON_RXIRQMODE;
139 wr_regl(port, S3C2410_UCON, ucon);
141 rx_enabled(port) = 1;
142 spin_unlock_irqrestore(&port->lock, flags);
145 static void s3c24xx_serial_rx_disable(struct uart_port *port)
150 spin_lock_irqsave(&port->lock, flags);
152 ucon = rd_regl(port, S3C2410_UCON);
153 ucon &= ~S3C2410_UCON_RXIRQMODE;
154 wr_regl(port, S3C2410_UCON, ucon);
156 rx_enabled(port) = 0;
157 spin_unlock_irqrestore(&port->lock, flags);
160 static void s3c24xx_serial_stop_tx(struct uart_port *port)
162 struct s3c24xx_uart_port *ourport = to_ourport(port);
163 struct s3c24xx_uart_dma *dma = ourport->dma;
164 struct circ_buf *xmit = &port->state->xmit;
165 struct dma_tx_state state;
168 if (!tx_enabled(port))
171 if (s3c24xx_serial_has_interrupt_mask(port))
172 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
174 disable_irq_nosync(ourport->tx_irq);
176 if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
177 dmaengine_pause(dma->tx_chan);
178 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
179 dmaengine_terminate_all(dma->tx_chan);
180 dma_sync_single_for_cpu(ourport->port.dev,
181 dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
182 async_tx_ack(dma->tx_desc);
183 count = dma->tx_bytes_requested - state.residue;
184 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
185 port->icount.tx += count;
188 tx_enabled(port) = 0;
189 ourport->tx_in_progress = 0;
191 if (port->flags & UPF_CONS_FLOW)
192 s3c24xx_serial_rx_enable(port);
194 ourport->tx_mode = 0;
197 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
199 static void s3c24xx_serial_tx_dma_complete(void *args)
201 struct s3c24xx_uart_port *ourport = args;
202 struct uart_port *port = &ourport->port;
203 struct circ_buf *xmit = &port->state->xmit;
204 struct s3c24xx_uart_dma *dma = ourport->dma;
205 struct dma_tx_state state;
210 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
211 count = dma->tx_bytes_requested - state.residue;
212 async_tx_ack(dma->tx_desc);
214 dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
215 dma->tx_size, DMA_TO_DEVICE);
217 spin_lock_irqsave(&port->lock, flags);
219 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
220 port->icount.tx += count;
221 ourport->tx_in_progress = 0;
223 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
224 uart_write_wakeup(port);
226 s3c24xx_serial_start_next_tx(ourport);
227 spin_unlock_irqrestore(&port->lock, flags);
230 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
232 struct uart_port *port = &ourport->port;
235 /* Mask Tx interrupt */
236 if (s3c24xx_serial_has_interrupt_mask(port))
237 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
239 disable_irq_nosync(ourport->tx_irq);
241 /* Enable tx dma mode */
242 ucon = rd_regl(port, S3C2410_UCON);
243 ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
244 ucon |= (dma_get_cache_alignment() >= 16) ?
245 S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
246 ucon |= S3C64XX_UCON_TXMODE_DMA;
247 wr_regl(port, S3C2410_UCON, ucon);
249 ourport->tx_mode = S3C24XX_TX_DMA;
252 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
254 struct uart_port *port = &ourport->port;
257 /* Set ufcon txtrig */
258 ourport->tx_in_progress = S3C24XX_TX_PIO;
259 ufcon = rd_regl(port, S3C2410_UFCON);
260 wr_regl(port, S3C2410_UFCON, ufcon);
262 /* Enable tx pio mode */
263 ucon = rd_regl(port, S3C2410_UCON);
264 ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
265 ucon |= S3C64XX_UCON_TXMODE_CPU;
266 wr_regl(port, S3C2410_UCON, ucon);
268 /* Unmask Tx interrupt */
269 if (s3c24xx_serial_has_interrupt_mask(port))
270 s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD,
273 enable_irq(ourport->tx_irq);
275 ourport->tx_mode = S3C24XX_TX_PIO;
278 static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
280 if (ourport->tx_mode != S3C24XX_TX_PIO)
281 enable_tx_pio(ourport);
284 static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
287 struct uart_port *port = &ourport->port;
288 struct circ_buf *xmit = &port->state->xmit;
289 struct s3c24xx_uart_dma *dma = ourport->dma;
292 if (ourport->tx_mode != S3C24XX_TX_DMA)
293 enable_tx_dma(ourport);
295 dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
296 dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
298 dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
299 dma->tx_size, DMA_TO_DEVICE);
301 dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
302 dma->tx_transfer_addr, dma->tx_size,
303 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
305 dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
309 dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
310 dma->tx_desc->callback_param = ourport;
311 dma->tx_bytes_requested = dma->tx_size;
313 ourport->tx_in_progress = S3C24XX_TX_DMA;
314 dma->tx_cookie = dmaengine_submit(dma->tx_desc);
315 dma_async_issue_pending(dma->tx_chan);
319 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
321 struct uart_port *port = &ourport->port;
322 struct circ_buf *xmit = &port->state->xmit;
325 /* Get data size up to the end of buffer */
326 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
329 s3c24xx_serial_stop_tx(port);
333 if (!ourport->dma || !ourport->dma->tx_chan ||
334 count < ourport->min_dma_size ||
335 xmit->tail & (dma_get_cache_alignment() - 1))
336 s3c24xx_serial_start_tx_pio(ourport);
338 s3c24xx_serial_start_tx_dma(ourport, count);
341 static void s3c24xx_serial_start_tx(struct uart_port *port)
343 struct s3c24xx_uart_port *ourport = to_ourport(port);
344 struct circ_buf *xmit = &port->state->xmit;
346 if (!tx_enabled(port)) {
347 if (port->flags & UPF_CONS_FLOW)
348 s3c24xx_serial_rx_disable(port);
350 tx_enabled(port) = 1;
351 if (!ourport->dma || !ourport->dma->tx_chan)
352 s3c24xx_serial_start_tx_pio(ourport);
355 if (ourport->dma && ourport->dma->tx_chan) {
356 if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
357 s3c24xx_serial_start_next_tx(ourport);
361 static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
362 struct tty_port *tty, int count)
364 struct s3c24xx_uart_dma *dma = ourport->dma;
370 dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
371 dma->rx_size, DMA_FROM_DEVICE);
373 ourport->port.icount.rx += count;
375 dev_err(ourport->port.dev, "No tty port\n");
378 copied = tty_insert_flip_string(tty,
379 ((unsigned char *)(ourport->dma->rx_buf)), count);
380 if (copied != count) {
382 dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
386 static void s3c24xx_serial_stop_rx(struct uart_port *port)
388 struct s3c24xx_uart_port *ourport = to_ourport(port);
389 struct s3c24xx_uart_dma *dma = ourport->dma;
390 struct tty_port *t = &port->state->port;
391 struct dma_tx_state state;
392 enum dma_status dma_status;
393 unsigned int received;
395 if (rx_enabled(port)) {
396 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
397 if (s3c24xx_serial_has_interrupt_mask(port))
398 s3c24xx_set_bit(port, S3C64XX_UINTM_RXD,
401 disable_irq_nosync(ourport->rx_irq);
402 rx_enabled(port) = 0;
404 if (dma && dma->rx_chan) {
405 dmaengine_pause(dma->tx_chan);
406 dma_status = dmaengine_tx_status(dma->rx_chan,
407 dma->rx_cookie, &state);
408 if (dma_status == DMA_IN_PROGRESS ||
409 dma_status == DMA_PAUSED) {
410 received = dma->rx_bytes_requested - state.residue;
411 dmaengine_terminate_all(dma->rx_chan);
412 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
417 static inline struct s3c24xx_uart_info
418 *s3c24xx_port_to_info(struct uart_port *port)
420 return to_ourport(port)->info;
423 static inline struct s3c2410_uartcfg
424 *s3c24xx_port_to_cfg(struct uart_port *port)
426 struct s3c24xx_uart_port *ourport;
428 if (port->dev == NULL)
431 ourport = container_of(port, struct s3c24xx_uart_port, port);
435 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
436 unsigned long ufstat)
438 struct s3c24xx_uart_info *info = ourport->info;
440 if (ufstat & info->rx_fifofull)
441 return ourport->port.fifosize;
443 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
446 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
447 static void s3c24xx_serial_rx_dma_complete(void *args)
449 struct s3c24xx_uart_port *ourport = args;
450 struct uart_port *port = &ourport->port;
452 struct s3c24xx_uart_dma *dma = ourport->dma;
453 struct tty_port *t = &port->state->port;
454 struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
456 struct dma_tx_state state;
460 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
461 received = dma->rx_bytes_requested - state.residue;
462 async_tx_ack(dma->rx_desc);
464 spin_lock_irqsave(&port->lock, flags);
467 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
470 tty_flip_buffer_push(t);
474 s3c64xx_start_rx_dma(ourport);
476 spin_unlock_irqrestore(&port->lock, flags);
479 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
481 struct s3c24xx_uart_dma *dma = ourport->dma;
483 dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
484 dma->rx_size, DMA_FROM_DEVICE);
486 dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
487 dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
490 dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
494 dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
495 dma->rx_desc->callback_param = ourport;
496 dma->rx_bytes_requested = dma->rx_size;
498 dma->rx_cookie = dmaengine_submit(dma->rx_desc);
499 dma_async_issue_pending(dma->rx_chan);
502 /* ? - where has parity gone?? */
503 #define S3C2410_UERSTAT_PARITY (0x1000)
505 static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
507 struct uart_port *port = &ourport->port;
510 /* set Rx mode to DMA mode */
511 ucon = rd_regl(port, S3C2410_UCON);
512 ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
513 S3C64XX_UCON_TIMEOUT_MASK |
514 S3C64XX_UCON_EMPTYINT_EN |
515 S3C64XX_UCON_DMASUS_EN |
516 S3C64XX_UCON_TIMEOUT_EN |
517 S3C64XX_UCON_RXMODE_MASK);
518 ucon |= S3C64XX_UCON_RXBURST_16 |
519 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
520 S3C64XX_UCON_EMPTYINT_EN |
521 S3C64XX_UCON_TIMEOUT_EN |
522 S3C64XX_UCON_RXMODE_DMA;
523 wr_regl(port, S3C2410_UCON, ucon);
525 ourport->rx_mode = S3C24XX_RX_DMA;
528 static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
530 struct uart_port *port = &ourport->port;
533 /* set Rx mode to DMA mode */
534 ucon = rd_regl(port, S3C2410_UCON);
535 ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
536 S3C64XX_UCON_EMPTYINT_EN |
537 S3C64XX_UCON_DMASUS_EN |
538 S3C64XX_UCON_TIMEOUT_EN |
539 S3C64XX_UCON_RXMODE_MASK);
540 ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
541 S3C64XX_UCON_TIMEOUT_EN |
542 S3C64XX_UCON_RXMODE_CPU;
543 wr_regl(port, S3C2410_UCON, ucon);
545 ourport->rx_mode = S3C24XX_RX_PIO;
548 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
550 static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
552 unsigned int utrstat, ufstat, received;
553 struct s3c24xx_uart_port *ourport = dev_id;
554 struct uart_port *port = &ourport->port;
555 struct s3c24xx_uart_dma *dma = ourport->dma;
556 struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
557 struct tty_port *t = &port->state->port;
559 struct dma_tx_state state;
561 utrstat = rd_regl(port, S3C2410_UTRSTAT);
562 ufstat = rd_regl(port, S3C2410_UFSTAT);
564 spin_lock_irqsave(&port->lock, flags);
566 if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
567 s3c64xx_start_rx_dma(ourport);
568 if (ourport->rx_mode == S3C24XX_RX_PIO)
569 enable_rx_dma(ourport);
573 if (ourport->rx_mode == S3C24XX_RX_DMA) {
574 dmaengine_pause(dma->rx_chan);
575 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
576 dmaengine_terminate_all(dma->rx_chan);
577 received = dma->rx_bytes_requested - state.residue;
578 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
580 enable_rx_pio(ourport);
583 s3c24xx_serial_rx_drain_fifo(ourport);
586 tty_flip_buffer_push(t);
590 wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
593 spin_unlock_irqrestore(&port->lock, flags);
598 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
600 struct uart_port *port = &ourport->port;
601 unsigned int ufcon, ch, flag, ufstat, uerstat;
602 unsigned int fifocnt = 0;
603 int max_count = port->fifosize;
605 while (max_count-- > 0) {
607 * Receive all characters known to be in FIFO
608 * before reading FIFO level again
611 ufstat = rd_regl(port, S3C2410_UFSTAT);
612 fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
618 uerstat = rd_regl(port, S3C2410_UERSTAT);
619 ch = rd_regb(port, S3C2410_URXH);
621 if (port->flags & UPF_CONS_FLOW) {
622 int txe = s3c24xx_serial_txempty_nofifo(port);
624 if (rx_enabled(port)) {
626 rx_enabled(port) = 0;
631 ufcon = rd_regl(port, S3C2410_UFCON);
632 ufcon |= S3C2410_UFCON_RESETRX;
633 wr_regl(port, S3C2410_UFCON, ufcon);
634 rx_enabled(port) = 1;
641 /* insert the character into the buffer */
646 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
647 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
650 /* check for break */
651 if (uerstat & S3C2410_UERSTAT_BREAK) {
654 if (uart_handle_break(port))
655 continue; /* Ignore character */
658 if (uerstat & S3C2410_UERSTAT_FRAME)
659 port->icount.frame++;
660 if (uerstat & S3C2410_UERSTAT_OVERRUN)
661 port->icount.overrun++;
663 uerstat &= port->read_status_mask;
665 if (uerstat & S3C2410_UERSTAT_BREAK)
667 else if (uerstat & S3C2410_UERSTAT_PARITY)
669 else if (uerstat & (S3C2410_UERSTAT_FRAME |
670 S3C2410_UERSTAT_OVERRUN))
674 if (uart_handle_sysrq_char(port, ch))
675 continue; /* Ignore character */
677 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
681 tty_flip_buffer_push(&port->state->port);
684 static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
686 struct s3c24xx_uart_port *ourport = dev_id;
687 struct uart_port *port = &ourport->port;
690 spin_lock_irqsave(&port->lock, flags);
691 s3c24xx_serial_rx_drain_fifo(ourport);
692 spin_unlock_irqrestore(&port->lock, flags);
698 static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id)
700 struct s3c24xx_uart_port *ourport = dev_id;
702 if (ourport->dma && ourport->dma->rx_chan)
703 return s3c24xx_serial_rx_chars_dma(dev_id);
704 return s3c24xx_serial_rx_chars_pio(dev_id);
707 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
709 struct s3c24xx_uart_port *ourport = id;
710 struct uart_port *port = &ourport->port;
711 struct circ_buf *xmit = &port->state->xmit;
713 int count, dma_count = 0;
715 spin_lock_irqsave(&port->lock, flags);
717 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
719 if (ourport->dma && ourport->dma->tx_chan &&
720 count >= ourport->min_dma_size) {
721 int align = dma_get_cache_alignment() -
722 (xmit->tail & (dma_get_cache_alignment() - 1));
723 if (count-align >= ourport->min_dma_size) {
724 dma_count = count-align;
730 wr_regb(port, S3C2410_UTXH, port->x_char);
736 /* if there isn't anything more to transmit, or the uart is now
737 * stopped, disable the uart and exit
740 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
741 s3c24xx_serial_stop_tx(port);
745 /* try and drain the buffer... */
747 if (count > port->fifosize) {
748 count = port->fifosize;
752 while (!uart_circ_empty(xmit) && count > 0) {
753 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
756 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
757 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
762 if (!count && dma_count) {
763 s3c24xx_serial_start_tx_dma(ourport, dma_count);
767 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
768 spin_unlock(&port->lock);
769 uart_write_wakeup(port);
770 spin_lock(&port->lock);
773 if (uart_circ_empty(xmit))
774 s3c24xx_serial_stop_tx(port);
777 spin_unlock_irqrestore(&port->lock, flags);
781 /* interrupt handler for s3c64xx and later SoC's.*/
782 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
784 struct s3c24xx_uart_port *ourport = id;
785 struct uart_port *port = &ourport->port;
786 unsigned int pend = rd_regl(port, S3C64XX_UINTP);
787 irqreturn_t ret = IRQ_HANDLED;
789 if (pend & S3C64XX_UINTM_RXD_MSK) {
790 ret = s3c24xx_serial_rx_chars(irq, id);
791 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
793 if (pend & S3C64XX_UINTM_TXD_MSK) {
794 ret = s3c24xx_serial_tx_chars(irq, id);
795 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
800 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
802 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
803 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
804 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
806 if (ufcon & S3C2410_UFCON_FIFOMODE) {
807 if ((ufstat & info->tx_fifomask) != 0 ||
808 (ufstat & info->tx_fifofull))
814 return s3c24xx_serial_txempty_nofifo(port);
817 /* no modem control lines */
818 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
820 unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
822 if (umstat & S3C2410_UMSTAT_CTS)
823 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
825 return TIOCM_CAR | TIOCM_DSR;
828 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
830 unsigned int umcon = rd_regl(port, S3C2410_UMCON);
832 if (mctrl & TIOCM_RTS)
833 umcon |= S3C2410_UMCOM_RTS_LOW;
835 umcon &= ~S3C2410_UMCOM_RTS_LOW;
837 wr_regl(port, S3C2410_UMCON, umcon);
840 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
845 spin_lock_irqsave(&port->lock, flags);
847 ucon = rd_regl(port, S3C2410_UCON);
850 ucon |= S3C2410_UCON_SBREAK;
852 ucon &= ~S3C2410_UCON_SBREAK;
854 wr_regl(port, S3C2410_UCON, ucon);
856 spin_unlock_irqrestore(&port->lock, flags);
859 static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
861 struct s3c24xx_uart_dma *dma = p->dma;
864 /* Default slave configuration parameters */
865 dma->rx_conf.direction = DMA_DEV_TO_MEM;
866 dma->rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
867 dma->rx_conf.src_addr = p->port.mapbase + S3C2410_URXH;
868 dma->rx_conf.src_maxburst = 1;
870 dma->tx_conf.direction = DMA_MEM_TO_DEV;
871 dma->tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
872 dma->tx_conf.dst_addr = p->port.mapbase + S3C2410_UTXH;
873 dma->tx_conf.dst_maxburst = 1;
875 dma->rx_chan = dma_request_chan(p->port.dev, "rx");
877 if (IS_ERR(dma->rx_chan))
878 return PTR_ERR(dma->rx_chan);
880 dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
882 dma->tx_chan = dma_request_chan(p->port.dev, "tx");
883 if (IS_ERR(dma->tx_chan)) {
884 ret = PTR_ERR(dma->tx_chan);
888 dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
891 dma->rx_size = PAGE_SIZE;
893 dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
899 dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf,
900 dma->rx_size, DMA_FROM_DEVICE);
901 if (dma_mapping_error(p->port.dev, dma->rx_addr)) {
907 dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf,
908 UART_XMIT_SIZE, DMA_TO_DEVICE);
909 if (dma_mapping_error(p->port.dev, dma->tx_addr)) {
917 dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size,
922 dma_release_channel(dma->tx_chan);
924 dma_release_channel(dma->rx_chan);
928 static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
930 struct s3c24xx_uart_dma *dma = p->dma;
933 dmaengine_terminate_all(dma->rx_chan);
934 dma_unmap_single(p->port.dev, dma->rx_addr,
935 dma->rx_size, DMA_FROM_DEVICE);
937 dma_release_channel(dma->rx_chan);
942 dmaengine_terminate_all(dma->tx_chan);
943 dma_unmap_single(p->port.dev, dma->tx_addr,
944 UART_XMIT_SIZE, DMA_TO_DEVICE);
945 dma_release_channel(dma->tx_chan);
950 static void s3c24xx_serial_shutdown(struct uart_port *port)
952 struct s3c24xx_uart_port *ourport = to_ourport(port);
954 if (ourport->tx_claimed) {
955 if (!s3c24xx_serial_has_interrupt_mask(port))
956 free_irq(ourport->tx_irq, ourport);
957 tx_enabled(port) = 0;
958 ourport->tx_claimed = 0;
959 ourport->tx_mode = 0;
962 if (ourport->rx_claimed) {
963 if (!s3c24xx_serial_has_interrupt_mask(port))
964 free_irq(ourport->rx_irq, ourport);
965 ourport->rx_claimed = 0;
966 rx_enabled(port) = 0;
969 /* Clear pending interrupts and mask all interrupts */
970 if (s3c24xx_serial_has_interrupt_mask(port)) {
971 free_irq(port->irq, ourport);
973 wr_regl(port, S3C64XX_UINTP, 0xf);
974 wr_regl(port, S3C64XX_UINTM, 0xf);
978 s3c24xx_serial_release_dma(ourport);
980 ourport->tx_in_progress = 0;
983 static int s3c24xx_serial_startup(struct uart_port *port)
985 struct s3c24xx_uart_port *ourport = to_ourport(port);
988 dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n",
989 port, (unsigned long long)port->mapbase, port->membase);
991 rx_enabled(port) = 1;
993 ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
994 s3c24xx_serial_portname(port), ourport);
997 dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq);
1001 ourport->rx_claimed = 1;
1003 dbg("requesting tx irq...\n");
1005 tx_enabled(port) = 1;
1007 ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
1008 s3c24xx_serial_portname(port), ourport);
1011 dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq);
1015 ourport->tx_claimed = 1;
1017 dbg("s3c24xx_serial_startup ok\n");
1019 /* the port reset code should have done the correct
1020 * register setup for the port controls */
1025 s3c24xx_serial_shutdown(port);
1029 static int s3c64xx_serial_startup(struct uart_port *port)
1031 struct s3c24xx_uart_port *ourport = to_ourport(port);
1032 unsigned long flags;
1036 dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n",
1037 port, (unsigned long long)port->mapbase, port->membase);
1039 wr_regl(port, S3C64XX_UINTM, 0xf);
1041 ret = s3c24xx_serial_request_dma(ourport);
1044 "DMA request failed, DMA will not be used\n");
1045 devm_kfree(port->dev, ourport->dma);
1046 ourport->dma = NULL;
1050 ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
1051 s3c24xx_serial_portname(port), ourport);
1053 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1057 /* For compatibility with s3c24xx Soc's */
1058 rx_enabled(port) = 1;
1059 ourport->rx_claimed = 1;
1060 tx_enabled(port) = 0;
1061 ourport->tx_claimed = 1;
1063 spin_lock_irqsave(&port->lock, flags);
1065 ufcon = rd_regl(port, S3C2410_UFCON);
1066 ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1067 if (!uart_console(port))
1068 ufcon |= S3C2410_UFCON_RESETTX;
1069 wr_regl(port, S3C2410_UFCON, ufcon);
1071 enable_rx_pio(ourport);
1073 spin_unlock_irqrestore(&port->lock, flags);
1075 /* Enable Rx Interrupt */
1076 s3c24xx_clear_bit(port, S3C64XX_UINTM_RXD, S3C64XX_UINTM);
1078 dbg("s3c64xx_serial_startup ok\n");
1082 /* power power management control */
1084 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
1087 struct s3c24xx_uart_port *ourport = to_ourport(port);
1088 int timeout = 10000;
1090 ourport->pm_level = level;
1094 while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
1097 if (!IS_ERR(ourport->baudclk))
1098 clk_disable_unprepare(ourport->baudclk);
1100 clk_disable_unprepare(ourport->clk);
1104 clk_prepare_enable(ourport->clk);
1106 if (!IS_ERR(ourport->baudclk))
1107 clk_prepare_enable(ourport->baudclk);
1111 dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
1115 /* baud rate calculation
1117 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
1118 * of different sources, including the peripheral clock ("pclk") and an
1119 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
1120 * with a programmable extra divisor.
1122 * The following code goes through the clock sources, and calculates the
1123 * baud clocks (and the resultant actual baud rates) and then tries to
1124 * pick the closest one and select that.
1128 #define MAX_CLK_NAME_LENGTH 15
1130 static inline int s3c24xx_serial_getsource(struct uart_port *port)
1132 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1135 if (info->num_clks == 1)
1138 ucon = rd_regl(port, S3C2410_UCON);
1139 ucon &= info->clksel_mask;
1140 return ucon >> info->clksel_shift;
1143 static void s3c24xx_serial_setsource(struct uart_port *port,
1144 unsigned int clk_sel)
1146 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1149 if (info->num_clks == 1)
1152 ucon = rd_regl(port, S3C2410_UCON);
1153 if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
1156 ucon &= ~info->clksel_mask;
1157 ucon |= clk_sel << info->clksel_shift;
1158 wr_regl(port, S3C2410_UCON, ucon);
1161 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
1162 unsigned int req_baud, struct clk **best_clk,
1163 unsigned int *clk_num)
1165 struct s3c24xx_uart_info *info = ourport->info;
1168 unsigned int cnt, baud, quot, best_quot = 0;
1169 char clkname[MAX_CLK_NAME_LENGTH];
1170 int calc_deviation, deviation = (1 << 30) - 1;
1172 for (cnt = 0; cnt < info->num_clks; cnt++) {
1173 /* Keep selected clock if provided */
1174 if (ourport->cfg->clk_sel &&
1175 !(ourport->cfg->clk_sel & (1 << cnt)))
1178 sprintf(clkname, "clk_uart_baud%d", cnt);
1179 clk = clk_get(ourport->port.dev, clkname);
1183 rate = clk_get_rate(clk);
1187 if (ourport->info->has_divslot) {
1188 unsigned long div = rate / req_baud;
1190 /* The UDIVSLOT register on the newer UARTs allows us to
1191 * get a divisor adjustment of 1/16th on the baud clock.
1193 * We don't keep the UDIVSLOT value (the 16ths we
1194 * calculated by not multiplying the baud by 16) as it
1195 * is easy enough to recalculate.
1201 quot = (rate + (8 * req_baud)) / (16 * req_baud);
1202 baud = rate / (quot * 16);
1206 calc_deviation = req_baud - baud;
1207 if (calc_deviation < 0)
1208 calc_deviation = -calc_deviation;
1210 if (calc_deviation < deviation) {
1214 deviation = calc_deviation;
1223 * This table takes the fractional value of the baud divisor and gives
1224 * the recommended setting for the UDIVSLOT register.
1226 static u16 udivslot_table[16] = {
1245 static void s3c24xx_serial_set_termios(struct uart_port *port,
1246 struct ktermios *termios,
1247 struct ktermios *old)
1249 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
1250 struct s3c24xx_uart_port *ourport = to_ourport(port);
1251 struct clk *clk = ERR_PTR(-EINVAL);
1252 unsigned long flags;
1253 unsigned int baud, quot, clk_sel = 0;
1256 unsigned int udivslot = 0;
1259 * We don't support modem control lines.
1261 termios->c_cflag &= ~(HUPCL | CMSPAR);
1262 termios->c_cflag |= CLOCAL;
1265 * Ask the core to calculate the divisor for us.
1268 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
1269 quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
1270 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
1271 quot = port->custom_divisor;
1275 /* check to see if we need to change clock source */
1277 if (ourport->baudclk != clk) {
1278 clk_prepare_enable(clk);
1280 s3c24xx_serial_setsource(port, clk_sel);
1282 if (!IS_ERR(ourport->baudclk)) {
1283 clk_disable_unprepare(ourport->baudclk);
1284 ourport->baudclk = ERR_PTR(-EINVAL);
1287 ourport->baudclk = clk;
1288 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
1291 if (ourport->info->has_divslot) {
1292 unsigned int div = ourport->baudclk_rate / baud;
1294 if (cfg->has_fracval) {
1295 udivslot = (div & 15);
1296 dbg("fracval = %04x\n", udivslot);
1298 udivslot = udivslot_table[div & 15];
1299 dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
1303 switch (termios->c_cflag & CSIZE) {
1305 dbg("config: 5bits/char\n");
1306 ulcon = S3C2410_LCON_CS5;
1309 dbg("config: 6bits/char\n");
1310 ulcon = S3C2410_LCON_CS6;
1313 dbg("config: 7bits/char\n");
1314 ulcon = S3C2410_LCON_CS7;
1318 dbg("config: 8bits/char\n");
1319 ulcon = S3C2410_LCON_CS8;
1323 /* preserve original lcon IR settings */
1324 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
1326 if (termios->c_cflag & CSTOPB)
1327 ulcon |= S3C2410_LCON_STOPB;
1329 if (termios->c_cflag & PARENB) {
1330 if (termios->c_cflag & PARODD)
1331 ulcon |= S3C2410_LCON_PODD;
1333 ulcon |= S3C2410_LCON_PEVEN;
1335 ulcon |= S3C2410_LCON_PNONE;
1338 spin_lock_irqsave(&port->lock, flags);
1340 dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
1341 ulcon, quot, udivslot);
1343 wr_regl(port, S3C2410_ULCON, ulcon);
1344 wr_regl(port, S3C2410_UBRDIV, quot);
1346 port->status &= ~UPSTAT_AUTOCTS;
1348 umcon = rd_regl(port, S3C2410_UMCON);
1349 if (termios->c_cflag & CRTSCTS) {
1350 umcon |= S3C2410_UMCOM_AFC;
1351 /* Disable RTS when RX FIFO contains 63 bytes */
1352 umcon &= ~S3C2412_UMCON_AFC_8;
1353 port->status = UPSTAT_AUTOCTS;
1355 umcon &= ~S3C2410_UMCOM_AFC;
1357 wr_regl(port, S3C2410_UMCON, umcon);
1359 if (ourport->info->has_divslot)
1360 wr_regl(port, S3C2443_DIVSLOT, udivslot);
1362 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
1363 rd_regl(port, S3C2410_ULCON),
1364 rd_regl(port, S3C2410_UCON),
1365 rd_regl(port, S3C2410_UFCON));
1368 * Update the per-port timeout.
1370 uart_update_timeout(port, termios->c_cflag, baud);
1373 * Which character status flags are we interested in?
1375 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
1376 if (termios->c_iflag & INPCK)
1377 port->read_status_mask |= S3C2410_UERSTAT_FRAME |
1378 S3C2410_UERSTAT_PARITY;
1380 * Which character status flags should we ignore?
1382 port->ignore_status_mask = 0;
1383 if (termios->c_iflag & IGNPAR)
1384 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
1385 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
1386 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
1389 * Ignore all characters if CREAD is not set.
1391 if ((termios->c_cflag & CREAD) == 0)
1392 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
1394 spin_unlock_irqrestore(&port->lock, flags);
1397 static const char *s3c24xx_serial_type(struct uart_port *port)
1399 switch (port->type) {
1407 return "S3C6400/10";
1413 #define MAP_SIZE (0x100)
1415 static void s3c24xx_serial_release_port(struct uart_port *port)
1417 release_mem_region(port->mapbase, MAP_SIZE);
1420 static int s3c24xx_serial_request_port(struct uart_port *port)
1422 const char *name = s3c24xx_serial_portname(port);
1423 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
1426 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
1428 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1430 if (flags & UART_CONFIG_TYPE &&
1431 s3c24xx_serial_request_port(port) == 0)
1432 port->type = info->type;
1436 * verify the new serial_struct (for TIOCSSERIAL).
1439 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
1441 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1443 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
1450 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1452 static struct console s3c24xx_serial_console;
1454 static int __init s3c24xx_serial_console_init(void)
1456 register_console(&s3c24xx_serial_console);
1459 console_initcall(s3c24xx_serial_console_init);
1461 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
1463 #define S3C24XX_SERIAL_CONSOLE NULL
1466 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1467 static int s3c24xx_serial_get_poll_char(struct uart_port *port);
1468 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1472 static struct uart_ops s3c24xx_serial_ops = {
1473 .pm = s3c24xx_serial_pm,
1474 .tx_empty = s3c24xx_serial_tx_empty,
1475 .get_mctrl = s3c24xx_serial_get_mctrl,
1476 .set_mctrl = s3c24xx_serial_set_mctrl,
1477 .stop_tx = s3c24xx_serial_stop_tx,
1478 .start_tx = s3c24xx_serial_start_tx,
1479 .stop_rx = s3c24xx_serial_stop_rx,
1480 .break_ctl = s3c24xx_serial_break_ctl,
1481 .startup = s3c24xx_serial_startup,
1482 .shutdown = s3c24xx_serial_shutdown,
1483 .set_termios = s3c24xx_serial_set_termios,
1484 .type = s3c24xx_serial_type,
1485 .release_port = s3c24xx_serial_release_port,
1486 .request_port = s3c24xx_serial_request_port,
1487 .config_port = s3c24xx_serial_config_port,
1488 .verify_port = s3c24xx_serial_verify_port,
1489 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1490 .poll_get_char = s3c24xx_serial_get_poll_char,
1491 .poll_put_char = s3c24xx_serial_put_poll_char,
1495 static struct uart_driver s3c24xx_uart_drv = {
1496 .owner = THIS_MODULE,
1497 .driver_name = "s3c2410_serial",
1498 .nr = CONFIG_SERIAL_SAMSUNG_UARTS,
1499 .cons = S3C24XX_SERIAL_CONSOLE,
1500 .dev_name = S3C24XX_SERIAL_NAME,
1501 .major = S3C24XX_SERIAL_MAJOR,
1502 .minor = S3C24XX_SERIAL_MINOR,
1505 #define __PORT_LOCK_UNLOCKED(i) \
1506 __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock)
1507 static struct s3c24xx_uart_port
1508 s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
1511 .lock = __PORT_LOCK_UNLOCKED(0),
1515 .ops = &s3c24xx_serial_ops,
1516 .flags = UPF_BOOT_AUTOCONF,
1522 .lock = __PORT_LOCK_UNLOCKED(1),
1526 .ops = &s3c24xx_serial_ops,
1527 .flags = UPF_BOOT_AUTOCONF,
1531 #if CONFIG_SERIAL_SAMSUNG_UARTS > 2
1535 .lock = __PORT_LOCK_UNLOCKED(2),
1539 .ops = &s3c24xx_serial_ops,
1540 .flags = UPF_BOOT_AUTOCONF,
1545 #if CONFIG_SERIAL_SAMSUNG_UARTS > 3
1548 .lock = __PORT_LOCK_UNLOCKED(3),
1552 .ops = &s3c24xx_serial_ops,
1553 .flags = UPF_BOOT_AUTOCONF,
1559 #undef __PORT_LOCK_UNLOCKED
1561 /* s3c24xx_serial_resetport
1563 * reset the fifos and other the settings.
1566 static void s3c24xx_serial_resetport(struct uart_port *port,
1567 struct s3c2410_uartcfg *cfg)
1569 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1570 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1571 unsigned int ucon_mask;
1573 ucon_mask = info->clksel_mask;
1574 if (info->type == PORT_S3C2440)
1575 ucon_mask |= S3C2440_UCON0_DIVMASK;
1578 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1580 /* reset both fifos */
1581 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1582 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1584 /* some delay is required after fifo reset */
1589 #ifdef CONFIG_ARM_S3C24XX_CPUFREQ
1591 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
1592 unsigned long val, void *data)
1594 struct s3c24xx_uart_port *port;
1595 struct uart_port *uport;
1597 port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1598 uport = &port->port;
1600 /* check to see if port is enabled */
1602 if (port->pm_level != 0)
1605 /* try and work out if the baudrate is changing, we can detect
1606 * a change in rate, but we do not have support for detecting
1607 * a disturbance in the clock-rate over the change.
1610 if (IS_ERR(port->baudclk))
1613 if (port->baudclk_rate == clk_get_rate(port->baudclk))
1616 if (val == CPUFREQ_PRECHANGE) {
1617 /* we should really shut the port down whilst the
1618 * frequency change is in progress. */
1620 } else if (val == CPUFREQ_POSTCHANGE) {
1621 struct ktermios *termios;
1622 struct tty_struct *tty;
1624 if (uport->state == NULL)
1627 tty = uport->state->port.tty;
1632 termios = &tty->termios;
1634 if (termios == NULL) {
1635 dev_warn(uport->dev, "%s: no termios?\n", __func__);
1639 s3c24xx_serial_set_termios(uport, termios, NULL);
1647 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1649 port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1651 return cpufreq_register_notifier(&port->freq_transition,
1652 CPUFREQ_TRANSITION_NOTIFIER);
1656 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1658 cpufreq_unregister_notifier(&port->freq_transition,
1659 CPUFREQ_TRANSITION_NOTIFIER);
1664 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1670 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1675 /* s3c24xx_serial_init_port
1677 * initialise a single serial port from the platform device given
1680 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1681 struct platform_device *platdev)
1683 struct uart_port *port = &ourport->port;
1684 struct s3c2410_uartcfg *cfg = ourport->cfg;
1685 struct resource *res;
1688 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1690 if (platdev == NULL)
1693 if (port->mapbase != 0)
1696 /* setup info for port */
1697 port->dev = &platdev->dev;
1699 /* Startup sequence is different for s3c64xx and higher SoC's */
1700 if (s3c24xx_serial_has_interrupt_mask(port))
1701 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1705 if (cfg->uart_flags & UPF_CONS_FLOW) {
1706 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1707 port->flags |= UPF_CONS_FLOW;
1710 /* sort our the physical and virtual addresses for each UART */
1712 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1714 dev_err(port->dev, "failed to find memory resource for uart\n");
1718 dbg("resource %pR)\n", res);
1720 port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
1721 if (!port->membase) {
1722 dev_err(port->dev, "failed to remap controller address\n");
1726 port->mapbase = res->start;
1727 ret = platform_get_irq(platdev, 0);
1732 ourport->rx_irq = ret;
1733 ourport->tx_irq = ret + 1;
1736 if (!s3c24xx_serial_has_interrupt_mask(port)) {
1737 ret = platform_get_irq(platdev, 1);
1739 ourport->tx_irq = ret;
1742 * DMA is currently supported only on DT platforms, if DMA properties
1745 if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
1747 ourport->dma = devm_kzalloc(port->dev,
1748 sizeof(*ourport->dma),
1750 if (!ourport->dma) {
1756 ourport->clk = clk_get(&platdev->dev, "uart");
1757 if (IS_ERR(ourport->clk)) {
1758 pr_err("%s: Controller clock not found\n",
1759 dev_name(&platdev->dev));
1760 ret = PTR_ERR(ourport->clk);
1764 ret = clk_prepare_enable(ourport->clk);
1766 pr_err("uart: clock failed to prepare+enable: %d\n", ret);
1767 clk_put(ourport->clk);
1771 /* Keep all interrupts masked and cleared */
1772 if (s3c24xx_serial_has_interrupt_mask(port)) {
1773 wr_regl(port, S3C64XX_UINTM, 0xf);
1774 wr_regl(port, S3C64XX_UINTP, 0xf);
1775 wr_regl(port, S3C64XX_UINTSP, 0xf);
1778 dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
1779 &port->mapbase, port->membase, port->irq,
1780 ourport->rx_irq, ourport->tx_irq, port->uartclk);
1782 /* reset the fifos (and setup the uart) */
1783 s3c24xx_serial_resetport(port, cfg);
1792 /* Device driver serial port probe */
1794 static const struct of_device_id s3c24xx_uart_dt_match[];
1795 static int probe_index;
1797 static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1798 struct platform_device *pdev)
1801 if (pdev->dev.of_node) {
1802 const struct of_device_id *match;
1803 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1804 return (struct s3c24xx_serial_drv_data *)match->data;
1807 return (struct s3c24xx_serial_drv_data *)
1808 platform_get_device_id(pdev)->driver_data;
1811 static int s3c24xx_serial_probe(struct platform_device *pdev)
1813 struct device_node *np = pdev->dev.of_node;
1814 struct s3c24xx_uart_port *ourport;
1815 int index = probe_index;
1819 ret = of_alias_get_id(np, "serial");
1824 dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index);
1826 if (index >= ARRAY_SIZE(s3c24xx_serial_ports)) {
1827 dev_err(&pdev->dev, "serial%d out of range\n", index);
1830 ourport = &s3c24xx_serial_ports[index];
1832 ourport->drv_data = s3c24xx_get_driver_data(pdev);
1833 if (!ourport->drv_data) {
1834 dev_err(&pdev->dev, "could not find driver data\n");
1838 ourport->baudclk = ERR_PTR(-EINVAL);
1839 ourport->info = ourport->drv_data->info;
1840 ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
1841 dev_get_platdata(&pdev->dev) :
1842 ourport->drv_data->def_cfg;
1845 of_property_read_u32(np,
1846 "samsung,uart-fifosize", &ourport->port.fifosize);
1848 if (ourport->drv_data->fifosize[index])
1849 ourport->port.fifosize = ourport->drv_data->fifosize[index];
1850 else if (ourport->info->fifosize)
1851 ourport->port.fifosize = ourport->info->fifosize;
1854 * DMA transfers must be aligned at least to cache line size,
1855 * so find minimal transfer size suitable for DMA mode
1857 ourport->min_dma_size = max_t(int, ourport->port.fifosize,
1858 dma_get_cache_alignment());
1860 dbg("%s: initialising port %p...\n", __func__, ourport);
1862 ret = s3c24xx_serial_init_port(ourport, pdev);
1866 if (!s3c24xx_uart_drv.state) {
1867 ret = uart_register_driver(&s3c24xx_uart_drv);
1869 pr_err("Failed to register Samsung UART driver\n");
1874 dbg("%s: adding port\n", __func__);
1875 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1876 platform_set_drvdata(pdev, &ourport->port);
1879 * Deactivate the clock enabled in s3c24xx_serial_init_port here,
1880 * so that a potential re-enablement through the pm-callback overlaps
1881 * and keeps the clock enabled in this case.
1883 clk_disable_unprepare(ourport->clk);
1885 ret = s3c24xx_serial_cpufreq_register(ourport);
1887 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
1894 static int s3c24xx_serial_remove(struct platform_device *dev)
1896 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1899 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
1900 uart_remove_one_port(&s3c24xx_uart_drv, port);
1903 uart_unregister_driver(&s3c24xx_uart_drv);
1908 /* UART power management code */
1909 #ifdef CONFIG_PM_SLEEP
1910 static int s3c24xx_serial_suspend(struct device *dev)
1912 struct uart_port *port = s3c24xx_dev_to_port(dev);
1915 uart_suspend_port(&s3c24xx_uart_drv, port);
1920 static int s3c24xx_serial_resume(struct device *dev)
1922 struct uart_port *port = s3c24xx_dev_to_port(dev);
1923 struct s3c24xx_uart_port *ourport = to_ourport(port);
1926 clk_prepare_enable(ourport->clk);
1927 if (!IS_ERR(ourport->baudclk))
1928 clk_prepare_enable(ourport->baudclk);
1929 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1930 if (!IS_ERR(ourport->baudclk))
1931 clk_disable_unprepare(ourport->baudclk);
1932 clk_disable_unprepare(ourport->clk);
1934 uart_resume_port(&s3c24xx_uart_drv, port);
1940 static int s3c24xx_serial_resume_noirq(struct device *dev)
1942 struct uart_port *port = s3c24xx_dev_to_port(dev);
1943 struct s3c24xx_uart_port *ourport = to_ourport(port);
1946 /* restore IRQ mask */
1947 if (s3c24xx_serial_has_interrupt_mask(port)) {
1948 unsigned int uintm = 0xf;
1949 if (tx_enabled(port))
1950 uintm &= ~S3C64XX_UINTM_TXD_MSK;
1951 if (rx_enabled(port))
1952 uintm &= ~S3C64XX_UINTM_RXD_MSK;
1953 clk_prepare_enable(ourport->clk);
1954 if (!IS_ERR(ourport->baudclk))
1955 clk_prepare_enable(ourport->baudclk);
1956 wr_regl(port, S3C64XX_UINTM, uintm);
1957 if (!IS_ERR(ourport->baudclk))
1958 clk_disable_unprepare(ourport->baudclk);
1959 clk_disable_unprepare(ourport->clk);
1966 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
1967 .suspend = s3c24xx_serial_suspend,
1968 .resume = s3c24xx_serial_resume,
1969 .resume_noirq = s3c24xx_serial_resume_noirq,
1971 #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
1973 #else /* !CONFIG_PM_SLEEP */
1975 #define SERIAL_SAMSUNG_PM_OPS NULL
1976 #endif /* CONFIG_PM_SLEEP */
1980 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1982 static struct uart_port *cons_uart;
1985 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1987 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1988 unsigned long ufstat, utrstat;
1990 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1991 /* fifo mode - check amount of data in fifo registers... */
1993 ufstat = rd_regl(port, S3C2410_UFSTAT);
1994 return (ufstat & info->tx_fifofull) ? 0 : 1;
1997 /* in non-fifo mode, we go and use the tx buffer empty */
1999 utrstat = rd_regl(port, S3C2410_UTRSTAT);
2000 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
2004 s3c24xx_port_configured(unsigned int ucon)
2006 /* consider the serial port configured if the tx/rx mode set */
2007 return (ucon & 0xf) != 0;
2010 #ifdef CONFIG_CONSOLE_POLL
2012 * Console polling routines for writing and reading from the uart while
2013 * in an interrupt or debug context.
2016 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
2018 struct s3c24xx_uart_port *ourport = to_ourport(port);
2019 unsigned int ufstat;
2021 ufstat = rd_regl(port, S3C2410_UFSTAT);
2022 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
2023 return NO_POLL_CHAR;
2025 return rd_regb(port, S3C2410_URXH);
2028 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
2031 unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2032 unsigned int ucon = rd_regl(port, S3C2410_UCON);
2034 /* not possible to xmit on unconfigured port */
2035 if (!s3c24xx_port_configured(ucon))
2038 while (!s3c24xx_serial_console_txrdy(port, ufcon))
2040 wr_regb(port, S3C2410_UTXH, c);
2043 #endif /* CONFIG_CONSOLE_POLL */
2046 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
2048 unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2050 while (!s3c24xx_serial_console_txrdy(port, ufcon))
2052 wr_regb(port, S3C2410_UTXH, ch);
2056 s3c24xx_serial_console_write(struct console *co, const char *s,
2059 unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
2061 /* not possible to xmit on unconfigured port */
2062 if (!s3c24xx_port_configured(ucon))
2065 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
2069 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
2070 int *parity, int *bits)
2075 unsigned int ubrdiv;
2077 unsigned int clk_sel;
2078 char clk_name[MAX_CLK_NAME_LENGTH];
2080 ulcon = rd_regl(port, S3C2410_ULCON);
2081 ucon = rd_regl(port, S3C2410_UCON);
2082 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
2084 dbg("s3c24xx_serial_get_options: port=%p\n"
2085 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
2086 port, ulcon, ucon, ubrdiv);
2088 if (s3c24xx_port_configured(ucon)) {
2089 switch (ulcon & S3C2410_LCON_CSMASK) {
2090 case S3C2410_LCON_CS5:
2093 case S3C2410_LCON_CS6:
2096 case S3C2410_LCON_CS7:
2099 case S3C2410_LCON_CS8:
2105 switch (ulcon & S3C2410_LCON_PMASK) {
2106 case S3C2410_LCON_PEVEN:
2110 case S3C2410_LCON_PODD:
2114 case S3C2410_LCON_PNONE:
2119 /* now calculate the baud rate */
2121 clk_sel = s3c24xx_serial_getsource(port);
2122 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
2124 clk = clk_get(port->dev, clk_name);
2126 rate = clk_get_rate(clk);
2130 *baud = rate / (16 * (ubrdiv + 1));
2131 dbg("calculated baud %d\n", *baud);
2137 s3c24xx_serial_console_setup(struct console *co, char *options)
2139 struct uart_port *port;
2145 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
2146 co, co->index, options);
2148 /* is this a valid port */
2150 if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
2153 port = &s3c24xx_serial_ports[co->index].port;
2155 /* is the port configured? */
2157 if (port->mapbase == 0x0)
2162 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
2165 * Check whether an invalid uart number has been specified, and
2166 * if so, search for the first available port that does have
2170 uart_parse_options(options, &baud, &parity, &bits, &flow);
2172 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
2174 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
2176 return uart_set_options(port, co, baud, parity, bits, flow);
2179 static struct console s3c24xx_serial_console = {
2180 .name = S3C24XX_SERIAL_NAME,
2181 .device = uart_console_device,
2182 .flags = CON_PRINTBUFFER,
2184 .write = s3c24xx_serial_console_write,
2185 .setup = s3c24xx_serial_console_setup,
2186 .data = &s3c24xx_uart_drv,
2188 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
2190 #ifdef CONFIG_CPU_S3C2410
2191 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
2192 .info = &(struct s3c24xx_uart_info) {
2193 .name = "Samsung S3C2410 UART",
2194 .type = PORT_S3C2410,
2196 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
2197 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
2198 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
2199 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
2200 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
2201 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
2202 .def_clk_sel = S3C2410_UCON_CLKSEL0,
2204 .clksel_mask = S3C2410_UCON_CLKMASK,
2205 .clksel_shift = S3C2410_UCON_CLKSHIFT,
2207 .def_cfg = &(struct s3c2410_uartcfg) {
2208 .ucon = S3C2410_UCON_DEFAULT,
2209 .ufcon = S3C2410_UFCON_DEFAULT,
2212 #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
2214 #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2217 #ifdef CONFIG_CPU_S3C2412
2218 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
2219 .info = &(struct s3c24xx_uart_info) {
2220 .name = "Samsung S3C2412 UART",
2221 .type = PORT_S3C2412,
2224 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2225 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2226 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2227 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2228 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2229 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2230 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2232 .clksel_mask = S3C2412_UCON_CLKMASK,
2233 .clksel_shift = S3C2412_UCON_CLKSHIFT,
2235 .def_cfg = &(struct s3c2410_uartcfg) {
2236 .ucon = S3C2410_UCON_DEFAULT,
2237 .ufcon = S3C2410_UFCON_DEFAULT,
2240 #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
2242 #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2245 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
2246 defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
2247 static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
2248 .info = &(struct s3c24xx_uart_info) {
2249 .name = "Samsung S3C2440 UART",
2250 .type = PORT_S3C2440,
2253 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2254 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2255 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2256 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2257 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2258 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2259 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2261 .clksel_mask = S3C2412_UCON_CLKMASK,
2262 .clksel_shift = S3C2412_UCON_CLKSHIFT,
2264 .def_cfg = &(struct s3c2410_uartcfg) {
2265 .ucon = S3C2410_UCON_DEFAULT,
2266 .ufcon = S3C2410_UFCON_DEFAULT,
2269 #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
2271 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2274 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
2275 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
2276 .info = &(struct s3c24xx_uart_info) {
2277 .name = "Samsung S3C6400 UART",
2278 .type = PORT_S3C6400,
2281 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2282 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2283 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2284 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2285 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2286 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2287 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2289 .clksel_mask = S3C6400_UCON_CLKMASK,
2290 .clksel_shift = S3C6400_UCON_CLKSHIFT,
2292 .def_cfg = &(struct s3c2410_uartcfg) {
2293 .ucon = S3C2410_UCON_DEFAULT,
2294 .ufcon = S3C2410_UFCON_DEFAULT,
2297 #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
2299 #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2302 #ifdef CONFIG_CPU_S5PV210
2303 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
2304 .info = &(struct s3c24xx_uart_info) {
2305 .name = "Samsung S5PV210 UART",
2306 .type = PORT_S3C6400,
2308 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
2309 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
2310 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
2311 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
2312 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
2313 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
2314 .def_clk_sel = S3C2410_UCON_CLKSEL0,
2316 .clksel_mask = S5PV210_UCON_CLKMASK,
2317 .clksel_shift = S5PV210_UCON_CLKSHIFT,
2319 .def_cfg = &(struct s3c2410_uartcfg) {
2320 .ucon = S5PV210_UCON_DEFAULT,
2321 .ufcon = S5PV210_UFCON_DEFAULT,
2323 .fifosize = { 256, 64, 16, 16 },
2325 #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
2327 #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2330 #if defined(CONFIG_ARCH_EXYNOS)
2331 #define EXYNOS_COMMON_SERIAL_DRV_DATA \
2332 .info = &(struct s3c24xx_uart_info) { \
2333 .name = "Samsung Exynos UART", \
2334 .type = PORT_S3C6400, \
2336 .rx_fifomask = S5PV210_UFSTAT_RXMASK, \
2337 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \
2338 .rx_fifofull = S5PV210_UFSTAT_RXFULL, \
2339 .tx_fifofull = S5PV210_UFSTAT_TXFULL, \
2340 .tx_fifomask = S5PV210_UFSTAT_TXMASK, \
2341 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \
2342 .def_clk_sel = S3C2410_UCON_CLKSEL0, \
2345 .clksel_shift = 0, \
2347 .def_cfg = &(struct s3c2410_uartcfg) { \
2348 .ucon = S5PV210_UCON_DEFAULT, \
2349 .ufcon = S5PV210_UFCON_DEFAULT, \
2353 static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
2354 EXYNOS_COMMON_SERIAL_DRV_DATA,
2355 .fifosize = { 256, 64, 16, 16 },
2358 static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
2359 EXYNOS_COMMON_SERIAL_DRV_DATA,
2360 .fifosize = { 64, 256, 16, 256 },
2363 #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
2364 #define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data)
2366 #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2367 #define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2370 static const struct platform_device_id s3c24xx_serial_driver_ids[] = {
2372 .name = "s3c2410-uart",
2373 .driver_data = S3C2410_SERIAL_DRV_DATA,
2375 .name = "s3c2412-uart",
2376 .driver_data = S3C2412_SERIAL_DRV_DATA,
2378 .name = "s3c2440-uart",
2379 .driver_data = S3C2440_SERIAL_DRV_DATA,
2381 .name = "s3c6400-uart",
2382 .driver_data = S3C6400_SERIAL_DRV_DATA,
2384 .name = "s5pv210-uart",
2385 .driver_data = S5PV210_SERIAL_DRV_DATA,
2387 .name = "exynos4210-uart",
2388 .driver_data = EXYNOS4210_SERIAL_DRV_DATA,
2390 .name = "exynos5433-uart",
2391 .driver_data = EXYNOS5433_SERIAL_DRV_DATA,
2395 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
2398 static const struct of_device_id s3c24xx_uart_dt_match[] = {
2399 { .compatible = "samsung,s3c2410-uart",
2400 .data = (void *)S3C2410_SERIAL_DRV_DATA },
2401 { .compatible = "samsung,s3c2412-uart",
2402 .data = (void *)S3C2412_SERIAL_DRV_DATA },
2403 { .compatible = "samsung,s3c2440-uart",
2404 .data = (void *)S3C2440_SERIAL_DRV_DATA },
2405 { .compatible = "samsung,s3c6400-uart",
2406 .data = (void *)S3C6400_SERIAL_DRV_DATA },
2407 { .compatible = "samsung,s5pv210-uart",
2408 .data = (void *)S5PV210_SERIAL_DRV_DATA },
2409 { .compatible = "samsung,exynos4210-uart",
2410 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
2411 { .compatible = "samsung,exynos5433-uart",
2412 .data = (void *)EXYNOS5433_SERIAL_DRV_DATA },
2415 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
2418 static struct platform_driver samsung_serial_driver = {
2419 .probe = s3c24xx_serial_probe,
2420 .remove = s3c24xx_serial_remove,
2421 .id_table = s3c24xx_serial_driver_ids,
2423 .name = "samsung-uart",
2424 .pm = SERIAL_SAMSUNG_PM_OPS,
2425 .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
2429 module_platform_driver(samsung_serial_driver);
2431 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2436 struct samsung_early_console_data {
2440 static void samsung_early_busyuart(struct uart_port *port)
2442 while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
2446 static void samsung_early_busyuart_fifo(struct uart_port *port)
2448 struct samsung_early_console_data *data = port->private_data;
2450 while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
2454 static void samsung_early_putc(struct uart_port *port, int c)
2456 if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
2457 samsung_early_busyuart_fifo(port);
2459 samsung_early_busyuart(port);
2461 writeb(c, port->membase + S3C2410_UTXH);
2464 static void samsung_early_write(struct console *con, const char *s, unsigned n)
2466 struct earlycon_device *dev = con->data;
2468 uart_console_write(&dev->port, s, n, samsung_early_putc);
2471 static int __init samsung_early_console_setup(struct earlycon_device *device,
2474 if (!device->port.membase)
2477 device->con->write = samsung_early_write;
2482 static struct samsung_early_console_data s3c2410_early_console_data = {
2483 .txfull_mask = S3C2410_UFSTAT_TXFULL,
2486 static int __init s3c2410_early_console_setup(struct earlycon_device *device,
2489 device->port.private_data = &s3c2410_early_console_data;
2490 return samsung_early_console_setup(device, opt);
2492 OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart",
2493 s3c2410_early_console_setup);
2495 /* S3C2412, S3C2440, S3C64xx */
2496 static struct samsung_early_console_data s3c2440_early_console_data = {
2497 .txfull_mask = S3C2440_UFSTAT_TXFULL,
2500 static int __init s3c2440_early_console_setup(struct earlycon_device *device,
2503 device->port.private_data = &s3c2440_early_console_data;
2504 return samsung_early_console_setup(device, opt);
2506 OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart",
2507 s3c2440_early_console_setup);
2508 OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart",
2509 s3c2440_early_console_setup);
2510 OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
2511 s3c2440_early_console_setup);
2513 /* S5PV210, EXYNOS */
2514 static struct samsung_early_console_data s5pv210_early_console_data = {
2515 .txfull_mask = S5PV210_UFSTAT_TXFULL,
2518 static int __init s5pv210_early_console_setup(struct earlycon_device *device,
2521 device->port.private_data = &s5pv210_early_console_data;
2522 return samsung_early_console_setup(device, opt);
2524 OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
2525 s5pv210_early_console_setup);
2526 OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
2527 s5pv210_early_console_setup);
2530 MODULE_ALIAS("platform:samsung-uart");
2531 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
2532 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
2533 MODULE_LICENSE("GPL v2");