1 // SPDX-License-Identifier: GPL-2.0
3 * Driver core for Samsung SoC onboard UARTs.
5 * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
6 * http://armlinux.simtec.co.uk/
9 /* Note on 2410 error handling
11 * The s3c2410 manual has a love/hate affair with the contents of the
12 * UERSTAT register in the UART blocks, and keeps marking some of the
13 * error bits as reserved. Having checked with the s3c2410x01,
14 * it copes with BREAKs properly, so I am happy to ignore the RESERVED
15 * feature from the latter versions of the manual.
17 * If it becomes aparrent that latter versions of the 2410 remove these
18 * bits, then action will have to be taken to differentiate the versions
19 * and change the policy on BREAK
24 #include <linux/dmaengine.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/slab.h>
27 #include <linux/math.h>
28 #include <linux/module.h>
29 #include <linux/ioport.h>
31 #include <linux/platform_device.h>
32 #include <linux/init.h>
33 #include <linux/sysrq.h>
34 #include <linux/console.h>
35 #include <linux/tty.h>
36 #include <linux/tty_flip.h>
37 #include <linux/serial_core.h>
38 #include <linux/serial.h>
39 #include <linux/serial_s3c.h>
40 #include <linux/delay.h>
41 #include <linux/clk.h>
42 #include <linux/cpufreq.h>
46 /* UART name and device definitions */
48 #define S3C24XX_SERIAL_NAME "ttySAC"
49 #define S3C24XX_SERIAL_MAJOR 204
50 #define S3C24XX_SERIAL_MINOR 64
55 #define UART_NR CONFIG_SERIAL_SAMSUNG_UARTS
58 #define S3C24XX_TX_PIO 1
59 #define S3C24XX_TX_DMA 2
60 #define S3C24XX_RX_PIO 1
61 #define S3C24XX_RX_DMA 2
63 /* flag to ignore all characters coming in */
64 #define RXSTAT_DUMMY_READ (0x10000000)
66 enum s3c24xx_port_type {
71 struct s3c24xx_uart_info {
73 enum s3c24xx_port_type type;
74 unsigned int port_type;
75 unsigned int fifosize;
76 unsigned long rx_fifomask;
77 unsigned long rx_fifoshift;
78 unsigned long rx_fifofull;
79 unsigned long tx_fifomask;
80 unsigned long tx_fifoshift;
81 unsigned long tx_fifofull;
82 unsigned int def_clk_sel;
83 unsigned long num_clks;
84 unsigned long clksel_mask;
85 unsigned long clksel_shift;
86 unsigned long ucon_mask;
88 /* uart port features */
90 unsigned int has_divslot:1;
93 struct s3c24xx_serial_drv_data {
94 const struct s3c24xx_uart_info info;
95 const struct s3c2410_uartcfg def_cfg;
96 const unsigned int fifosize[UART_NR];
99 struct s3c24xx_uart_dma {
100 unsigned int rx_chan_id;
101 unsigned int tx_chan_id;
103 struct dma_slave_config rx_conf;
104 struct dma_slave_config tx_conf;
106 struct dma_chan *rx_chan;
107 struct dma_chan *tx_chan;
112 dma_cookie_t rx_cookie;
113 dma_cookie_t tx_cookie;
117 dma_addr_t tx_transfer_addr;
122 struct dma_async_tx_descriptor *tx_desc;
123 struct dma_async_tx_descriptor *rx_desc;
125 int tx_bytes_requested;
126 int rx_bytes_requested;
129 struct s3c24xx_uart_port {
130 unsigned char rx_enabled;
131 unsigned char tx_enabled;
132 unsigned int pm_level;
133 unsigned long baudclk_rate;
134 unsigned int min_dma_size;
139 unsigned int tx_in_progress;
140 unsigned int tx_mode;
141 unsigned int rx_mode;
143 const struct s3c24xx_uart_info *info;
146 struct uart_port port;
147 const struct s3c24xx_serial_drv_data *drv_data;
149 /* reference to platform data */
150 const struct s3c2410_uartcfg *cfg;
152 struct s3c24xx_uart_dma *dma;
155 static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport);
157 /* conversion functions */
159 #define s3c24xx_dev_to_port(__dev) dev_get_drvdata(__dev)
161 /* register access controls */
163 #define portaddr(port, reg) ((port)->membase + (reg))
164 #define portaddrl(port, reg) \
165 ((unsigned long *)(unsigned long)((port)->membase + (reg)))
167 static u32 rd_reg(const struct uart_port *port, u32 reg)
169 switch (port->iotype) {
171 return readb_relaxed(portaddr(port, reg));
173 return readl_relaxed(portaddr(port, reg));
180 #define rd_regl(port, reg) (readl_relaxed(portaddr(port, reg)))
182 static void wr_reg(const struct uart_port *port, u32 reg, u32 val)
184 switch (port->iotype) {
186 writeb_relaxed(val, portaddr(port, reg));
189 writel_relaxed(val, portaddr(port, reg));
194 #define wr_regl(port, reg, val) writel_relaxed(val, portaddr(port, reg))
196 /* Byte-order aware bit setting/clearing functions. */
198 static inline void s3c24xx_set_bit(const struct uart_port *port, int idx,
204 local_irq_save(flags);
205 val = rd_regl(port, reg);
207 wr_regl(port, reg, val);
208 local_irq_restore(flags);
211 static inline void s3c24xx_clear_bit(const struct uart_port *port, int idx,
217 local_irq_save(flags);
218 val = rd_regl(port, reg);
220 wr_regl(port, reg, val);
221 local_irq_restore(flags);
224 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
226 return container_of(port, struct s3c24xx_uart_port, port);
229 /* translate a port to the device name */
231 static inline const char *s3c24xx_serial_portname(const struct uart_port *port)
233 return to_platform_device(port->dev)->name;
236 static int s3c24xx_serial_txempty_nofifo(const struct uart_port *port)
238 return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
241 static void s3c24xx_serial_rx_enable(struct uart_port *port)
243 struct s3c24xx_uart_port *ourport = to_ourport(port);
245 unsigned int ucon, ufcon;
248 uart_port_lock_irqsave(port, &flags);
250 while (--count && !s3c24xx_serial_txempty_nofifo(port))
253 ufcon = rd_regl(port, S3C2410_UFCON);
254 ufcon |= S3C2410_UFCON_RESETRX;
255 wr_regl(port, S3C2410_UFCON, ufcon);
257 ucon = rd_regl(port, S3C2410_UCON);
258 ucon |= S3C2410_UCON_RXIRQMODE;
259 wr_regl(port, S3C2410_UCON, ucon);
261 ourport->rx_enabled = 1;
262 uart_port_unlock_irqrestore(port, flags);
265 static void s3c24xx_serial_rx_disable(struct uart_port *port)
267 struct s3c24xx_uart_port *ourport = to_ourport(port);
271 uart_port_lock_irqsave(port, &flags);
273 ucon = rd_regl(port, S3C2410_UCON);
274 ucon &= ~S3C2410_UCON_RXIRQMODE;
275 wr_regl(port, S3C2410_UCON, ucon);
277 ourport->rx_enabled = 0;
278 uart_port_unlock_irqrestore(port, flags);
281 static void s3c24xx_serial_stop_tx(struct uart_port *port)
283 struct s3c24xx_uart_port *ourport = to_ourport(port);
284 struct s3c24xx_uart_dma *dma = ourport->dma;
285 struct dma_tx_state state;
288 if (!ourport->tx_enabled)
291 switch (ourport->info->type) {
293 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
296 s3c24xx_clear_bit(port, APPLE_S5L_UCON_TXTHRESH_ENA, S3C2410_UCON);
299 disable_irq_nosync(ourport->tx_irq);
303 if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
304 dmaengine_pause(dma->tx_chan);
305 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
306 dmaengine_terminate_all(dma->tx_chan);
307 dma_sync_single_for_cpu(dma->tx_chan->device->dev,
308 dma->tx_transfer_addr, dma->tx_size,
310 async_tx_ack(dma->tx_desc);
311 count = dma->tx_bytes_requested - state.residue;
312 uart_xmit_advance(port, count);
315 ourport->tx_enabled = 0;
316 ourport->tx_in_progress = 0;
318 if (port->flags & UPF_CONS_FLOW)
319 s3c24xx_serial_rx_enable(port);
321 ourport->tx_mode = 0;
324 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
326 static void s3c24xx_serial_tx_dma_complete(void *args)
328 struct s3c24xx_uart_port *ourport = args;
329 struct uart_port *port = &ourport->port;
330 struct circ_buf *xmit = &port->state->xmit;
331 struct s3c24xx_uart_dma *dma = ourport->dma;
332 struct dma_tx_state state;
336 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
337 count = dma->tx_bytes_requested - state.residue;
338 async_tx_ack(dma->tx_desc);
340 dma_sync_single_for_cpu(dma->tx_chan->device->dev,
341 dma->tx_transfer_addr, dma->tx_size,
344 uart_port_lock_irqsave(port, &flags);
346 uart_xmit_advance(port, count);
347 ourport->tx_in_progress = 0;
349 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
350 uart_write_wakeup(port);
352 s3c24xx_serial_start_next_tx(ourport);
353 uart_port_unlock_irqrestore(port, flags);
356 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
358 const struct uart_port *port = &ourport->port;
361 /* Mask Tx interrupt */
362 switch (ourport->info->type) {
364 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
367 WARN_ON(1); // No DMA
370 disable_irq_nosync(ourport->tx_irq);
374 /* Enable tx dma mode */
375 ucon = rd_regl(port, S3C2410_UCON);
376 ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
377 ucon |= S3C64XX_UCON_TXBURST_1;
378 ucon |= S3C64XX_UCON_TXMODE_DMA;
379 wr_regl(port, S3C2410_UCON, ucon);
381 ourport->tx_mode = S3C24XX_TX_DMA;
384 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
386 const struct uart_port *port = &ourport->port;
389 /* Set ufcon txtrig */
390 ourport->tx_in_progress = S3C24XX_TX_PIO;
391 ufcon = rd_regl(port, S3C2410_UFCON);
392 wr_regl(port, S3C2410_UFCON, ufcon);
394 /* Enable tx pio mode */
395 ucon = rd_regl(port, S3C2410_UCON);
396 ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
397 ucon |= S3C64XX_UCON_TXMODE_CPU;
398 wr_regl(port, S3C2410_UCON, ucon);
400 /* Unmask Tx interrupt */
401 switch (ourport->info->type) {
403 s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD,
407 ucon |= APPLE_S5L_UCON_TXTHRESH_ENA_MSK;
408 wr_regl(port, S3C2410_UCON, ucon);
411 enable_irq(ourport->tx_irq);
415 ourport->tx_mode = S3C24XX_TX_PIO;
418 * The Apple version only has edge triggered TX IRQs, so we need
419 * to kick off the process by sending some characters here.
421 if (ourport->info->type == TYPE_APPLE_S5L)
422 s3c24xx_serial_tx_chars(ourport);
425 static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
427 if (ourport->tx_mode != S3C24XX_TX_PIO)
428 enable_tx_pio(ourport);
431 static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
434 struct uart_port *port = &ourport->port;
435 struct circ_buf *xmit = &port->state->xmit;
436 struct s3c24xx_uart_dma *dma = ourport->dma;
438 if (ourport->tx_mode != S3C24XX_TX_DMA)
439 enable_tx_dma(ourport);
441 dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
442 dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
444 dma_sync_single_for_device(dma->tx_chan->device->dev,
445 dma->tx_transfer_addr, dma->tx_size,
448 dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
449 dma->tx_transfer_addr, dma->tx_size,
450 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
452 dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
456 dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
457 dma->tx_desc->callback_param = ourport;
458 dma->tx_bytes_requested = dma->tx_size;
460 ourport->tx_in_progress = S3C24XX_TX_DMA;
461 dma->tx_cookie = dmaengine_submit(dma->tx_desc);
462 dma_async_issue_pending(dma->tx_chan);
466 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
468 struct uart_port *port = &ourport->port;
469 struct circ_buf *xmit = &port->state->xmit;
472 /* Get data size up to the end of buffer */
473 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
476 s3c24xx_serial_stop_tx(port);
480 if (!ourport->dma || !ourport->dma->tx_chan ||
481 count < ourport->min_dma_size ||
482 xmit->tail & (dma_get_cache_alignment() - 1))
483 s3c24xx_serial_start_tx_pio(ourport);
485 s3c24xx_serial_start_tx_dma(ourport, count);
488 static void s3c24xx_serial_start_tx(struct uart_port *port)
490 struct s3c24xx_uart_port *ourport = to_ourport(port);
491 struct circ_buf *xmit = &port->state->xmit;
493 if (!ourport->tx_enabled) {
494 if (port->flags & UPF_CONS_FLOW)
495 s3c24xx_serial_rx_disable(port);
497 ourport->tx_enabled = 1;
498 if (!ourport->dma || !ourport->dma->tx_chan)
499 s3c24xx_serial_start_tx_pio(ourport);
502 if (ourport->dma && ourport->dma->tx_chan) {
503 if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
504 s3c24xx_serial_start_next_tx(ourport);
508 static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
509 struct tty_port *tty, int count)
511 struct s3c24xx_uart_dma *dma = ourport->dma;
517 dma_sync_single_for_cpu(dma->rx_chan->device->dev, dma->rx_addr,
518 dma->rx_size, DMA_FROM_DEVICE);
520 ourport->port.icount.rx += count;
522 dev_err(ourport->port.dev, "No tty port\n");
525 copied = tty_insert_flip_string(tty,
526 ((unsigned char *)(ourport->dma->rx_buf)), count);
527 if (copied != count) {
529 dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
533 static void s3c24xx_serial_stop_rx(struct uart_port *port)
535 struct s3c24xx_uart_port *ourport = to_ourport(port);
536 struct s3c24xx_uart_dma *dma = ourport->dma;
537 struct tty_port *t = &port->state->port;
538 struct dma_tx_state state;
539 enum dma_status dma_status;
540 unsigned int received;
542 if (ourport->rx_enabled) {
543 dev_dbg(port->dev, "stopping rx\n");
544 switch (ourport->info->type) {
546 s3c24xx_set_bit(port, S3C64XX_UINTM_RXD,
550 s3c24xx_clear_bit(port, APPLE_S5L_UCON_RXTHRESH_ENA, S3C2410_UCON);
551 s3c24xx_clear_bit(port, APPLE_S5L_UCON_RXTO_ENA, S3C2410_UCON);
554 disable_irq_nosync(ourport->rx_irq);
557 ourport->rx_enabled = 0;
559 if (dma && dma->rx_chan) {
560 dmaengine_pause(dma->tx_chan);
561 dma_status = dmaengine_tx_status(dma->rx_chan,
562 dma->rx_cookie, &state);
563 if (dma_status == DMA_IN_PROGRESS ||
564 dma_status == DMA_PAUSED) {
565 received = dma->rx_bytes_requested - state.residue;
566 dmaengine_terminate_all(dma->rx_chan);
567 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
572 static inline const struct s3c24xx_uart_info
573 *s3c24xx_port_to_info(struct uart_port *port)
575 return to_ourport(port)->info;
578 static inline const struct s3c2410_uartcfg
579 *s3c24xx_port_to_cfg(const struct uart_port *port)
581 const struct s3c24xx_uart_port *ourport;
583 if (port->dev == NULL)
586 ourport = container_of(port, struct s3c24xx_uart_port, port);
590 static int s3c24xx_serial_rx_fifocnt(const struct s3c24xx_uart_port *ourport,
591 unsigned long ufstat)
593 const struct s3c24xx_uart_info *info = ourport->info;
595 if (ufstat & info->rx_fifofull)
596 return ourport->port.fifosize;
598 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
601 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
602 static void s3c24xx_serial_rx_dma_complete(void *args)
604 struct s3c24xx_uart_port *ourport = args;
605 struct uart_port *port = &ourport->port;
607 struct s3c24xx_uart_dma *dma = ourport->dma;
608 struct tty_port *t = &port->state->port;
609 struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
611 struct dma_tx_state state;
615 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
616 received = dma->rx_bytes_requested - state.residue;
617 async_tx_ack(dma->rx_desc);
619 uart_port_lock_irqsave(port, &flags);
622 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
625 tty_flip_buffer_push(t);
629 s3c64xx_start_rx_dma(ourport);
631 uart_port_unlock_irqrestore(port, flags);
634 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
636 struct s3c24xx_uart_dma *dma = ourport->dma;
638 dma_sync_single_for_device(dma->rx_chan->device->dev, dma->rx_addr,
639 dma->rx_size, DMA_FROM_DEVICE);
641 dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
642 dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
645 dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
649 dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
650 dma->rx_desc->callback_param = ourport;
651 dma->rx_bytes_requested = dma->rx_size;
653 dma->rx_cookie = dmaengine_submit(dma->rx_desc);
654 dma_async_issue_pending(dma->rx_chan);
657 /* ? - where has parity gone?? */
658 #define S3C2410_UERSTAT_PARITY (0x1000)
660 static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
662 struct uart_port *port = &ourport->port;
665 /* set Rx mode to DMA mode */
666 ucon = rd_regl(port, S3C2410_UCON);
667 ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
668 S3C64XX_UCON_TIMEOUT_MASK |
669 S3C64XX_UCON_EMPTYINT_EN |
670 S3C64XX_UCON_DMASUS_EN |
671 S3C64XX_UCON_TIMEOUT_EN |
672 S3C64XX_UCON_RXMODE_MASK);
673 ucon |= S3C64XX_UCON_RXBURST_1 |
674 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
675 S3C64XX_UCON_EMPTYINT_EN |
676 S3C64XX_UCON_TIMEOUT_EN |
677 S3C64XX_UCON_RXMODE_DMA;
678 wr_regl(port, S3C2410_UCON, ucon);
680 ourport->rx_mode = S3C24XX_RX_DMA;
683 static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
685 struct uart_port *port = &ourport->port;
688 /* set Rx mode to DMA mode */
689 ucon = rd_regl(port, S3C2410_UCON);
690 ucon &= ~S3C64XX_UCON_RXMODE_MASK;
691 ucon |= S3C64XX_UCON_RXMODE_CPU;
693 /* Apple types use these bits for IRQ masks */
694 if (ourport->info->type != TYPE_APPLE_S5L) {
695 ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
696 S3C64XX_UCON_EMPTYINT_EN |
697 S3C64XX_UCON_DMASUS_EN |
698 S3C64XX_UCON_TIMEOUT_EN);
699 ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
700 S3C64XX_UCON_TIMEOUT_EN;
702 wr_regl(port, S3C2410_UCON, ucon);
704 ourport->rx_mode = S3C24XX_RX_PIO;
707 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
709 static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
711 unsigned int utrstat, received;
712 struct s3c24xx_uart_port *ourport = dev_id;
713 struct uart_port *port = &ourport->port;
714 struct s3c24xx_uart_dma *dma = ourport->dma;
715 struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
716 struct tty_port *t = &port->state->port;
717 struct dma_tx_state state;
719 utrstat = rd_regl(port, S3C2410_UTRSTAT);
720 rd_regl(port, S3C2410_UFSTAT);
722 uart_port_lock(port);
724 if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
725 s3c64xx_start_rx_dma(ourport);
726 if (ourport->rx_mode == S3C24XX_RX_PIO)
727 enable_rx_dma(ourport);
731 if (ourport->rx_mode == S3C24XX_RX_DMA) {
732 dmaengine_pause(dma->rx_chan);
733 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
734 dmaengine_terminate_all(dma->rx_chan);
735 received = dma->rx_bytes_requested - state.residue;
736 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
738 enable_rx_pio(ourport);
741 s3c24xx_serial_rx_drain_fifo(ourport);
744 tty_flip_buffer_push(t);
748 wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
751 uart_port_unlock(port);
756 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
758 struct uart_port *port = &ourport->port;
759 unsigned int ufcon, ufstat, uerstat;
760 unsigned int fifocnt = 0;
761 int max_count = port->fifosize;
764 while (max_count-- > 0) {
766 * Receive all characters known to be in FIFO
767 * before reading FIFO level again
770 ufstat = rd_regl(port, S3C2410_UFSTAT);
771 fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
777 uerstat = rd_regl(port, S3C2410_UERSTAT);
778 ch = rd_reg(port, S3C2410_URXH);
780 if (port->flags & UPF_CONS_FLOW) {
781 int txe = s3c24xx_serial_txempty_nofifo(port);
783 if (ourport->rx_enabled) {
785 ourport->rx_enabled = 0;
790 ufcon = rd_regl(port, S3C2410_UFCON);
791 ufcon |= S3C2410_UFCON_RESETRX;
792 wr_regl(port, S3C2410_UFCON, ufcon);
793 ourport->rx_enabled = 1;
800 /* insert the character into the buffer */
805 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
807 "rxerr: port ch=0x%02x, rxs=0x%08x\n",
810 /* check for break */
811 if (uerstat & S3C2410_UERSTAT_BREAK) {
812 dev_dbg(port->dev, "break!\n");
814 if (uart_handle_break(port))
815 continue; /* Ignore character */
818 if (uerstat & S3C2410_UERSTAT_FRAME)
819 port->icount.frame++;
820 if (uerstat & S3C2410_UERSTAT_OVERRUN)
821 port->icount.overrun++;
823 uerstat &= port->read_status_mask;
825 if (uerstat & S3C2410_UERSTAT_BREAK)
827 else if (uerstat & S3C2410_UERSTAT_PARITY)
829 else if (uerstat & (S3C2410_UERSTAT_FRAME |
830 S3C2410_UERSTAT_OVERRUN))
834 if (uart_handle_sysrq_char(port, ch))
835 continue; /* Ignore character */
837 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
841 tty_flip_buffer_push(&port->state->port);
844 static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
846 struct s3c24xx_uart_port *ourport = dev_id;
847 struct uart_port *port = &ourport->port;
849 uart_port_lock(port);
850 s3c24xx_serial_rx_drain_fifo(ourport);
851 uart_port_unlock(port);
856 static irqreturn_t s3c24xx_serial_rx_irq(int irq, void *dev_id)
858 struct s3c24xx_uart_port *ourport = dev_id;
860 if (ourport->dma && ourport->dma->rx_chan)
861 return s3c24xx_serial_rx_chars_dma(dev_id);
862 return s3c24xx_serial_rx_chars_pio(dev_id);
865 static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport)
867 struct uart_port *port = &ourport->port;
868 struct circ_buf *xmit = &port->state->xmit;
869 int count, dma_count = 0;
871 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
873 if (ourport->dma && ourport->dma->tx_chan &&
874 count >= ourport->min_dma_size) {
875 int align = dma_get_cache_alignment() -
876 (xmit->tail & (dma_get_cache_alignment() - 1));
877 if (count - align >= ourport->min_dma_size) {
878 dma_count = count - align;
884 wr_reg(port, S3C2410_UTXH, port->x_char);
890 /* if there isn't anything more to transmit, or the uart is now
891 * stopped, disable the uart and exit
894 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
895 s3c24xx_serial_stop_tx(port);
899 /* try and drain the buffer... */
901 if (count > port->fifosize) {
902 count = port->fifosize;
906 while (!uart_circ_empty(xmit) && count > 0) {
907 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
910 wr_reg(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
911 uart_xmit_advance(port, 1);
915 if (!count && dma_count) {
916 s3c24xx_serial_start_tx_dma(ourport, dma_count);
920 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
921 uart_write_wakeup(port);
923 if (uart_circ_empty(xmit))
924 s3c24xx_serial_stop_tx(port);
927 static irqreturn_t s3c24xx_serial_tx_irq(int irq, void *id)
929 struct s3c24xx_uart_port *ourport = id;
930 struct uart_port *port = &ourport->port;
932 uart_port_lock(port);
934 s3c24xx_serial_tx_chars(ourport);
936 uart_port_unlock(port);
940 /* interrupt handler for s3c64xx and later SoC's.*/
941 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
943 const struct s3c24xx_uart_port *ourport = id;
944 const struct uart_port *port = &ourport->port;
945 unsigned int pend = rd_regl(port, S3C64XX_UINTP);
946 irqreturn_t ret = IRQ_HANDLED;
948 if (pend & S3C64XX_UINTM_RXD_MSK) {
949 ret = s3c24xx_serial_rx_irq(irq, id);
950 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
952 if (pend & S3C64XX_UINTM_TXD_MSK) {
953 ret = s3c24xx_serial_tx_irq(irq, id);
954 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
959 /* interrupt handler for Apple SoC's.*/
960 static irqreturn_t apple_serial_handle_irq(int irq, void *id)
962 const struct s3c24xx_uart_port *ourport = id;
963 const struct uart_port *port = &ourport->port;
964 unsigned int pend = rd_regl(port, S3C2410_UTRSTAT);
965 irqreturn_t ret = IRQ_NONE;
967 if (pend & (APPLE_S5L_UTRSTAT_RXTHRESH | APPLE_S5L_UTRSTAT_RXTO)) {
968 wr_regl(port, S3C2410_UTRSTAT,
969 APPLE_S5L_UTRSTAT_RXTHRESH | APPLE_S5L_UTRSTAT_RXTO);
970 ret = s3c24xx_serial_rx_irq(irq, id);
972 if (pend & APPLE_S5L_UTRSTAT_TXTHRESH) {
973 wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_TXTHRESH);
974 ret = s3c24xx_serial_tx_irq(irq, id);
980 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
982 const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
983 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
984 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
986 if (ufcon & S3C2410_UFCON_FIFOMODE) {
987 if ((ufstat & info->tx_fifomask) != 0 ||
988 (ufstat & info->tx_fifofull))
993 return s3c24xx_serial_txempty_nofifo(port) ? TIOCSER_TEMT : 0;
996 /* no modem control lines */
997 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
999 unsigned int umstat = rd_reg(port, S3C2410_UMSTAT);
1001 if (umstat & S3C2410_UMSTAT_CTS)
1002 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
1004 return TIOCM_CAR | TIOCM_DSR;
1007 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
1009 unsigned int umcon = rd_regl(port, S3C2410_UMCON);
1010 unsigned int ucon = rd_regl(port, S3C2410_UCON);
1012 if (mctrl & TIOCM_RTS)
1013 umcon |= S3C2410_UMCOM_RTS_LOW;
1015 umcon &= ~S3C2410_UMCOM_RTS_LOW;
1017 wr_regl(port, S3C2410_UMCON, umcon);
1019 if (mctrl & TIOCM_LOOP)
1020 ucon |= S3C2410_UCON_LOOPBACK;
1022 ucon &= ~S3C2410_UCON_LOOPBACK;
1024 wr_regl(port, S3C2410_UCON, ucon);
1027 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
1029 unsigned long flags;
1032 uart_port_lock_irqsave(port, &flags);
1034 ucon = rd_regl(port, S3C2410_UCON);
1037 ucon |= S3C2410_UCON_SBREAK;
1039 ucon &= ~S3C2410_UCON_SBREAK;
1041 wr_regl(port, S3C2410_UCON, ucon);
1043 uart_port_unlock_irqrestore(port, flags);
1046 static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
1048 struct s3c24xx_uart_dma *dma = p->dma;
1049 struct dma_slave_caps dma_caps;
1050 const char *reason = NULL;
1053 /* Default slave configuration parameters */
1054 dma->rx_conf.direction = DMA_DEV_TO_MEM;
1055 dma->rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
1056 dma->rx_conf.src_addr = p->port.mapbase + S3C2410_URXH;
1057 dma->rx_conf.src_maxburst = 1;
1059 dma->tx_conf.direction = DMA_MEM_TO_DEV;
1060 dma->tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
1061 dma->tx_conf.dst_addr = p->port.mapbase + S3C2410_UTXH;
1062 dma->tx_conf.dst_maxburst = 1;
1064 dma->rx_chan = dma_request_chan(p->port.dev, "rx");
1066 if (IS_ERR(dma->rx_chan)) {
1067 reason = "DMA RX channel request failed";
1068 ret = PTR_ERR(dma->rx_chan);
1072 ret = dma_get_slave_caps(dma->rx_chan, &dma_caps);
1074 dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) {
1075 reason = "insufficient DMA RX engine capabilities";
1077 goto err_release_rx;
1080 dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
1082 dma->tx_chan = dma_request_chan(p->port.dev, "tx");
1083 if (IS_ERR(dma->tx_chan)) {
1084 reason = "DMA TX channel request failed";
1085 ret = PTR_ERR(dma->tx_chan);
1086 goto err_release_rx;
1089 ret = dma_get_slave_caps(dma->tx_chan, &dma_caps);
1091 dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) {
1092 reason = "insufficient DMA TX engine capabilities";
1094 goto err_release_tx;
1097 dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
1100 dma->rx_size = PAGE_SIZE;
1102 dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
1105 goto err_release_tx;
1108 dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
1109 dma->rx_size, DMA_FROM_DEVICE);
1110 if (dma_mapping_error(dma->rx_chan->device->dev, dma->rx_addr)) {
1111 reason = "DMA mapping error for RX buffer";
1117 dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
1118 p->port.state->xmit.buf, UART_XMIT_SIZE,
1120 if (dma_mapping_error(dma->tx_chan->device->dev, dma->tx_addr)) {
1121 reason = "DMA mapping error for TX buffer";
1129 dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
1130 dma->rx_size, DMA_FROM_DEVICE);
1134 dma_release_channel(dma->tx_chan);
1136 dma_release_channel(dma->rx_chan);
1139 dev_warn(p->port.dev, "%s, DMA will not be used\n", reason);
1143 static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
1145 struct s3c24xx_uart_dma *dma = p->dma;
1148 dmaengine_terminate_all(dma->rx_chan);
1149 dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
1150 dma->rx_size, DMA_FROM_DEVICE);
1152 dma_release_channel(dma->rx_chan);
1153 dma->rx_chan = NULL;
1157 dmaengine_terminate_all(dma->tx_chan);
1158 dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
1159 UART_XMIT_SIZE, DMA_TO_DEVICE);
1160 dma_release_channel(dma->tx_chan);
1161 dma->tx_chan = NULL;
1165 static void s3c64xx_serial_shutdown(struct uart_port *port)
1167 struct s3c24xx_uart_port *ourport = to_ourport(port);
1169 ourport->tx_enabled = 0;
1170 ourport->tx_mode = 0;
1171 ourport->rx_enabled = 0;
1173 free_irq(port->irq, ourport);
1175 wr_regl(port, S3C64XX_UINTP, 0xf);
1176 wr_regl(port, S3C64XX_UINTM, 0xf);
1179 s3c24xx_serial_release_dma(ourport);
1181 ourport->tx_in_progress = 0;
1184 static void apple_s5l_serial_shutdown(struct uart_port *port)
1186 struct s3c24xx_uart_port *ourport = to_ourport(port);
1190 ucon = rd_regl(port, S3C2410_UCON);
1191 ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
1192 APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
1193 APPLE_S5L_UCON_RXTO_ENA_MSK);
1194 wr_regl(port, S3C2410_UCON, ucon);
1196 wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_ALL_FLAGS);
1198 free_irq(port->irq, ourport);
1200 ourport->tx_enabled = 0;
1201 ourport->tx_mode = 0;
1202 ourport->rx_enabled = 0;
1205 s3c24xx_serial_release_dma(ourport);
1207 ourport->tx_in_progress = 0;
1210 static int s3c64xx_serial_startup(struct uart_port *port)
1212 struct s3c24xx_uart_port *ourport = to_ourport(port);
1213 unsigned long flags;
1217 wr_regl(port, S3C64XX_UINTM, 0xf);
1219 ret = s3c24xx_serial_request_dma(ourport);
1221 devm_kfree(port->dev, ourport->dma);
1222 ourport->dma = NULL;
1226 ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
1227 s3c24xx_serial_portname(port), ourport);
1229 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1233 /* For compatibility with s3c24xx Soc's */
1234 ourport->rx_enabled = 1;
1235 ourport->tx_enabled = 0;
1237 uart_port_lock_irqsave(port, &flags);
1239 ufcon = rd_regl(port, S3C2410_UFCON);
1240 ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1241 if (!uart_console(port))
1242 ufcon |= S3C2410_UFCON_RESETTX;
1243 wr_regl(port, S3C2410_UFCON, ufcon);
1245 enable_rx_pio(ourport);
1247 uart_port_unlock_irqrestore(port, flags);
1249 /* Enable Rx Interrupt */
1250 s3c24xx_clear_bit(port, S3C64XX_UINTM_RXD, S3C64XX_UINTM);
1255 static int apple_s5l_serial_startup(struct uart_port *port)
1257 struct s3c24xx_uart_port *ourport = to_ourport(port);
1258 unsigned long flags;
1262 wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_ALL_FLAGS);
1264 ret = request_irq(port->irq, apple_serial_handle_irq, 0,
1265 s3c24xx_serial_portname(port), ourport);
1267 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1271 /* For compatibility with s3c24xx Soc's */
1272 ourport->rx_enabled = 1;
1273 ourport->tx_enabled = 0;
1275 uart_port_lock_irqsave(port, &flags);
1277 ufcon = rd_regl(port, S3C2410_UFCON);
1278 ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1279 if (!uart_console(port))
1280 ufcon |= S3C2410_UFCON_RESETTX;
1281 wr_regl(port, S3C2410_UFCON, ufcon);
1283 enable_rx_pio(ourport);
1285 uart_port_unlock_irqrestore(port, flags);
1287 /* Enable Rx Interrupt */
1288 s3c24xx_set_bit(port, APPLE_S5L_UCON_RXTHRESH_ENA, S3C2410_UCON);
1289 s3c24xx_set_bit(port, APPLE_S5L_UCON_RXTO_ENA, S3C2410_UCON);
1294 /* power power management control */
1296 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
1299 struct s3c24xx_uart_port *ourport = to_ourport(port);
1300 int timeout = 10000;
1302 ourport->pm_level = level;
1306 while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
1309 if (!IS_ERR(ourport->baudclk))
1310 clk_disable_unprepare(ourport->baudclk);
1312 clk_disable_unprepare(ourport->clk);
1316 clk_prepare_enable(ourport->clk);
1318 if (!IS_ERR(ourport->baudclk))
1319 clk_prepare_enable(ourport->baudclk);
1322 dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
1326 /* baud rate calculation
1328 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
1329 * of different sources, including the peripheral clock ("pclk") and an
1330 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
1331 * with a programmable extra divisor.
1333 * The following code goes through the clock sources, and calculates the
1334 * baud clocks (and the resultant actual baud rates) and then tries to
1335 * pick the closest one and select that.
1339 #define MAX_CLK_NAME_LENGTH 15
1341 static inline int s3c24xx_serial_getsource(struct uart_port *port)
1343 const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1346 if (info->num_clks == 1)
1349 ucon = rd_regl(port, S3C2410_UCON);
1350 ucon &= info->clksel_mask;
1351 return ucon >> info->clksel_shift;
1354 static void s3c24xx_serial_setsource(struct uart_port *port,
1355 unsigned int clk_sel)
1357 const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1360 if (info->num_clks == 1)
1363 ucon = rd_regl(port, S3C2410_UCON);
1364 if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
1367 ucon &= ~info->clksel_mask;
1368 ucon |= clk_sel << info->clksel_shift;
1369 wr_regl(port, S3C2410_UCON, ucon);
1372 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
1373 unsigned int req_baud, struct clk **best_clk,
1374 unsigned int *clk_num)
1376 const struct s3c24xx_uart_info *info = ourport->info;
1379 unsigned int cnt, baud, quot, best_quot = 0;
1380 char clkname[MAX_CLK_NAME_LENGTH];
1381 int calc_deviation, deviation = (1 << 30) - 1;
1383 for (cnt = 0; cnt < info->num_clks; cnt++) {
1384 /* Keep selected clock if provided */
1385 if (ourport->cfg->clk_sel &&
1386 !(ourport->cfg->clk_sel & (1 << cnt)))
1389 sprintf(clkname, "clk_uart_baud%d", cnt);
1390 clk = clk_get(ourport->port.dev, clkname);
1394 rate = clk_get_rate(clk);
1396 dev_err(ourport->port.dev,
1397 "Failed to get clock rate for %s.\n", clkname);
1402 if (ourport->info->has_divslot) {
1403 unsigned long div = rate / req_baud;
1405 /* The UDIVSLOT register on the newer UARTs allows us to
1406 * get a divisor adjustment of 1/16th on the baud clock.
1408 * We don't keep the UDIVSLOT value (the 16ths we
1409 * calculated by not multiplying the baud by 16) as it
1410 * is easy enough to recalculate.
1416 quot = (rate + (8 * req_baud)) / (16 * req_baud);
1417 baud = rate / (quot * 16);
1421 calc_deviation = abs(req_baud - baud);
1423 if (calc_deviation < deviation) {
1425 * If we find a better clk, release the previous one, if
1428 if (!IS_ERR(*best_clk))
1433 deviation = calc_deviation;
1444 * This table takes the fractional value of the baud divisor and gives
1445 * the recommended setting for the UDIVSLOT register.
1447 static const u16 udivslot_table[16] = {
1466 static void s3c24xx_serial_set_termios(struct uart_port *port,
1467 struct ktermios *termios,
1468 const struct ktermios *old)
1470 const struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
1471 struct s3c24xx_uart_port *ourport = to_ourport(port);
1472 struct clk *clk = ERR_PTR(-EINVAL);
1473 unsigned long flags;
1474 unsigned int baud, quot, clk_sel = 0;
1477 unsigned int udivslot = 0;
1480 * We don't support modem control lines.
1482 termios->c_cflag &= ~(HUPCL | CMSPAR);
1483 termios->c_cflag |= CLOCAL;
1486 * Ask the core to calculate the divisor for us.
1489 baud = uart_get_baud_rate(port, termios, old, 0, 3000000);
1490 quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
1491 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
1492 quot = port->custom_divisor;
1496 /* check to see if we need to change clock source */
1498 if (ourport->baudclk != clk) {
1499 clk_prepare_enable(clk);
1501 s3c24xx_serial_setsource(port, clk_sel);
1503 if (!IS_ERR(ourport->baudclk)) {
1504 clk_disable_unprepare(ourport->baudclk);
1505 ourport->baudclk = ERR_PTR(-EINVAL);
1508 ourport->baudclk = clk;
1509 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
1512 if (ourport->info->has_divslot) {
1513 unsigned int div = ourport->baudclk_rate / baud;
1515 if (cfg->has_fracval) {
1516 udivslot = (div & 15);
1517 dev_dbg(port->dev, "fracval = %04x\n", udivslot);
1519 udivslot = udivslot_table[div & 15];
1520 dev_dbg(port->dev, "udivslot = %04x (div %d)\n",
1521 udivslot, div & 15);
1525 switch (termios->c_cflag & CSIZE) {
1527 dev_dbg(port->dev, "config: 5bits/char\n");
1528 ulcon = S3C2410_LCON_CS5;
1531 dev_dbg(port->dev, "config: 6bits/char\n");
1532 ulcon = S3C2410_LCON_CS6;
1535 dev_dbg(port->dev, "config: 7bits/char\n");
1536 ulcon = S3C2410_LCON_CS7;
1540 dev_dbg(port->dev, "config: 8bits/char\n");
1541 ulcon = S3C2410_LCON_CS8;
1545 /* preserve original lcon IR settings */
1546 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
1548 if (termios->c_cflag & CSTOPB)
1549 ulcon |= S3C2410_LCON_STOPB;
1551 if (termios->c_cflag & PARENB) {
1552 if (termios->c_cflag & PARODD)
1553 ulcon |= S3C2410_LCON_PODD;
1555 ulcon |= S3C2410_LCON_PEVEN;
1557 ulcon |= S3C2410_LCON_PNONE;
1560 uart_port_lock_irqsave(port, &flags);
1563 "setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
1564 ulcon, quot, udivslot);
1566 wr_regl(port, S3C2410_ULCON, ulcon);
1567 wr_regl(port, S3C2410_UBRDIV, quot);
1569 port->status &= ~UPSTAT_AUTOCTS;
1571 umcon = rd_regl(port, S3C2410_UMCON);
1572 if (termios->c_cflag & CRTSCTS) {
1573 umcon |= S3C2410_UMCOM_AFC;
1574 /* Disable RTS when RX FIFO contains 63 bytes */
1575 umcon &= ~S3C2412_UMCON_AFC_8;
1576 port->status = UPSTAT_AUTOCTS;
1578 umcon &= ~S3C2410_UMCOM_AFC;
1580 wr_regl(port, S3C2410_UMCON, umcon);
1582 if (ourport->info->has_divslot)
1583 wr_regl(port, S3C2443_DIVSLOT, udivslot);
1586 "uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
1587 rd_regl(port, S3C2410_ULCON),
1588 rd_regl(port, S3C2410_UCON),
1589 rd_regl(port, S3C2410_UFCON));
1592 * Update the per-port timeout.
1594 uart_update_timeout(port, termios->c_cflag, baud);
1597 * Which character status flags are we interested in?
1599 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
1600 if (termios->c_iflag & INPCK)
1601 port->read_status_mask |= S3C2410_UERSTAT_FRAME |
1602 S3C2410_UERSTAT_PARITY;
1604 * Which character status flags should we ignore?
1606 port->ignore_status_mask = 0;
1607 if (termios->c_iflag & IGNPAR)
1608 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
1609 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
1610 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
1613 * Ignore all characters if CREAD is not set.
1615 if ((termios->c_cflag & CREAD) == 0)
1616 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
1618 uart_port_unlock_irqrestore(port, flags);
1621 static const char *s3c24xx_serial_type(struct uart_port *port)
1623 const struct s3c24xx_uart_port *ourport = to_ourport(port);
1625 switch (ourport->info->type) {
1627 return "S3C6400/10";
1628 case TYPE_APPLE_S5L:
1635 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
1637 const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1639 if (flags & UART_CONFIG_TYPE)
1640 port->type = info->port_type;
1644 * verify the new serial_struct (for TIOCSSERIAL).
1647 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
1649 const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1651 if (ser->type != PORT_UNKNOWN && ser->type != info->port_type)
1657 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1659 static struct console s3c24xx_serial_console;
1661 static void __init s3c24xx_serial_register_console(void)
1663 register_console(&s3c24xx_serial_console);
1666 static void s3c24xx_serial_unregister_console(void)
1668 if (console_is_registered(&s3c24xx_serial_console))
1669 unregister_console(&s3c24xx_serial_console);
1672 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
1674 static inline void s3c24xx_serial_register_console(void) { }
1675 static inline void s3c24xx_serial_unregister_console(void) { }
1676 #define S3C24XX_SERIAL_CONSOLE NULL
1679 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1680 static int s3c24xx_serial_get_poll_char(struct uart_port *port);
1681 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1685 static const struct uart_ops s3c64xx_serial_ops = {
1686 .pm = s3c24xx_serial_pm,
1687 .tx_empty = s3c24xx_serial_tx_empty,
1688 .get_mctrl = s3c24xx_serial_get_mctrl,
1689 .set_mctrl = s3c24xx_serial_set_mctrl,
1690 .stop_tx = s3c24xx_serial_stop_tx,
1691 .start_tx = s3c24xx_serial_start_tx,
1692 .stop_rx = s3c24xx_serial_stop_rx,
1693 .break_ctl = s3c24xx_serial_break_ctl,
1694 .startup = s3c64xx_serial_startup,
1695 .shutdown = s3c64xx_serial_shutdown,
1696 .set_termios = s3c24xx_serial_set_termios,
1697 .type = s3c24xx_serial_type,
1698 .config_port = s3c24xx_serial_config_port,
1699 .verify_port = s3c24xx_serial_verify_port,
1700 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1701 .poll_get_char = s3c24xx_serial_get_poll_char,
1702 .poll_put_char = s3c24xx_serial_put_poll_char,
1706 static const struct uart_ops apple_s5l_serial_ops = {
1707 .pm = s3c24xx_serial_pm,
1708 .tx_empty = s3c24xx_serial_tx_empty,
1709 .get_mctrl = s3c24xx_serial_get_mctrl,
1710 .set_mctrl = s3c24xx_serial_set_mctrl,
1711 .stop_tx = s3c24xx_serial_stop_tx,
1712 .start_tx = s3c24xx_serial_start_tx,
1713 .stop_rx = s3c24xx_serial_stop_rx,
1714 .break_ctl = s3c24xx_serial_break_ctl,
1715 .startup = apple_s5l_serial_startup,
1716 .shutdown = apple_s5l_serial_shutdown,
1717 .set_termios = s3c24xx_serial_set_termios,
1718 .type = s3c24xx_serial_type,
1719 .config_port = s3c24xx_serial_config_port,
1720 .verify_port = s3c24xx_serial_verify_port,
1721 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1722 .poll_get_char = s3c24xx_serial_get_poll_char,
1723 .poll_put_char = s3c24xx_serial_put_poll_char,
1727 static struct uart_driver s3c24xx_uart_drv = {
1728 .owner = THIS_MODULE,
1729 .driver_name = "s3c2410_serial",
1731 .cons = S3C24XX_SERIAL_CONSOLE,
1732 .dev_name = S3C24XX_SERIAL_NAME,
1733 .major = S3C24XX_SERIAL_MAJOR,
1734 .minor = S3C24XX_SERIAL_MINOR,
1737 static struct s3c24xx_uart_port s3c24xx_serial_ports[UART_NR];
1739 static void s3c24xx_serial_init_port_default(int index) {
1740 struct uart_port *port = &s3c24xx_serial_ports[index].port;
1742 spin_lock_init(&port->lock);
1744 port->iotype = UPIO_MEM;
1746 port->fifosize = 16;
1747 port->flags = UPF_BOOT_AUTOCONF;
1751 /* s3c24xx_serial_resetport
1753 * reset the fifos and other the settings.
1756 static void s3c24xx_serial_resetport(struct uart_port *port,
1757 const struct s3c2410_uartcfg *cfg)
1759 const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1760 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1762 ucon &= (info->clksel_mask | info->ucon_mask);
1763 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1765 /* reset both fifos */
1766 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1767 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1769 /* some delay is required after fifo reset */
1773 static int s3c24xx_serial_enable_baudclk(struct s3c24xx_uart_port *ourport)
1775 struct device *dev = ourport->port.dev;
1776 const struct s3c24xx_uart_info *info = ourport->info;
1777 char clk_name[MAX_CLK_NAME_LENGTH];
1778 unsigned int clk_sel;
1783 clk_sel = ourport->cfg->clk_sel ? : info->def_clk_sel;
1784 for (clk_num = 0; clk_num < info->num_clks; clk_num++) {
1785 if (!(clk_sel & (1 << clk_num)))
1788 sprintf(clk_name, "clk_uart_baud%d", clk_num);
1789 clk = clk_get(dev, clk_name);
1793 ret = clk_prepare_enable(clk);
1799 ourport->baudclk = clk;
1800 ourport->baudclk_rate = clk_get_rate(clk);
1801 s3c24xx_serial_setsource(&ourport->port, clk_num);
1809 /* s3c24xx_serial_init_port
1811 * initialise a single serial port from the platform device given
1814 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1815 struct platform_device *platdev)
1817 struct uart_port *port = &ourport->port;
1818 const struct s3c2410_uartcfg *cfg = ourport->cfg;
1819 struct resource *res;
1822 if (platdev == NULL)
1825 if (port->mapbase != 0)
1828 /* setup info for port */
1829 port->dev = &platdev->dev;
1833 if (cfg->uart_flags & UPF_CONS_FLOW) {
1834 dev_dbg(port->dev, "enabling flow control\n");
1835 port->flags |= UPF_CONS_FLOW;
1838 /* sort our the physical and virtual addresses for each UART */
1840 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1842 dev_err(port->dev, "failed to find memory resource for uart\n");
1846 dev_dbg(port->dev, "resource %pR)\n", res);
1848 port->membase = devm_ioremap_resource(port->dev, res);
1849 if (IS_ERR(port->membase)) {
1850 dev_err(port->dev, "failed to remap controller address\n");
1854 port->mapbase = res->start;
1855 ret = platform_get_irq(platdev, 0);
1860 ourport->rx_irq = ret;
1861 ourport->tx_irq = ret + 1;
1865 * DMA is currently supported only on DT platforms, if DMA properties
1868 if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
1870 ourport->dma = devm_kzalloc(port->dev,
1871 sizeof(*ourport->dma),
1873 if (!ourport->dma) {
1879 ourport->clk = clk_get(&platdev->dev, "uart");
1880 if (IS_ERR(ourport->clk)) {
1881 pr_err("%s: Controller clock not found\n",
1882 dev_name(&platdev->dev));
1883 ret = PTR_ERR(ourport->clk);
1887 ret = clk_prepare_enable(ourport->clk);
1889 pr_err("uart: clock failed to prepare+enable: %d\n", ret);
1890 clk_put(ourport->clk);
1894 ret = s3c24xx_serial_enable_baudclk(ourport);
1896 pr_warn("uart: failed to enable baudclk\n");
1898 /* Keep all interrupts masked and cleared */
1899 switch (ourport->info->type) {
1901 wr_regl(port, S3C64XX_UINTM, 0xf);
1902 wr_regl(port, S3C64XX_UINTP, 0xf);
1903 wr_regl(port, S3C64XX_UINTSP, 0xf);
1905 case TYPE_APPLE_S5L: {
1908 ucon = rd_regl(port, S3C2410_UCON);
1909 ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
1910 APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
1911 APPLE_S5L_UCON_RXTO_ENA_MSK);
1912 wr_regl(port, S3C2410_UCON, ucon);
1914 wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_ALL_FLAGS);
1921 dev_dbg(port->dev, "port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
1922 &port->mapbase, port->membase, port->irq,
1923 ourport->rx_irq, ourport->tx_irq, port->uartclk);
1925 /* reset the fifos (and setup the uart) */
1926 s3c24xx_serial_resetport(port, cfg);
1935 /* Device driver serial port probe */
1937 static int probe_index;
1939 static inline const struct s3c24xx_serial_drv_data *
1940 s3c24xx_get_driver_data(struct platform_device *pdev)
1942 if (dev_of_node(&pdev->dev))
1943 return of_device_get_match_data(&pdev->dev);
1945 return (struct s3c24xx_serial_drv_data *)
1946 platform_get_device_id(pdev)->driver_data;
1949 static int s3c24xx_serial_probe(struct platform_device *pdev)
1951 struct device_node *np = pdev->dev.of_node;
1952 struct s3c24xx_uart_port *ourport;
1953 int index = probe_index;
1957 ret = of_alias_get_id(np, "serial");
1962 if (index >= ARRAY_SIZE(s3c24xx_serial_ports)) {
1963 dev_err(&pdev->dev, "serial%d out of range\n", index);
1966 ourport = &s3c24xx_serial_ports[index];
1968 s3c24xx_serial_init_port_default(index);
1970 ourport->drv_data = s3c24xx_get_driver_data(pdev);
1971 if (!ourport->drv_data) {
1972 dev_err(&pdev->dev, "could not find driver data\n");
1976 ourport->baudclk = ERR_PTR(-EINVAL);
1977 ourport->info = &ourport->drv_data->info;
1978 ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
1979 dev_get_platdata(&pdev->dev) :
1980 &ourport->drv_data->def_cfg;
1982 switch (ourport->info->type) {
1984 ourport->port.ops = &s3c64xx_serial_ops;
1986 case TYPE_APPLE_S5L:
1987 ourport->port.ops = &apple_s5l_serial_ops;
1992 of_property_read_u32(np,
1993 "samsung,uart-fifosize", &ourport->port.fifosize);
1995 if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
1998 ourport->port.iotype = UPIO_MEM;
2001 ourport->port.iotype = UPIO_MEM32;
2004 dev_warn(&pdev->dev, "unsupported reg-io-width (%d)\n",
2011 if (ourport->drv_data->fifosize[index])
2012 ourport->port.fifosize = ourport->drv_data->fifosize[index];
2013 else if (ourport->info->fifosize)
2014 ourport->port.fifosize = ourport->info->fifosize;
2015 ourport->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SAMSUNG_CONSOLE);
2018 * DMA transfers must be aligned at least to cache line size,
2019 * so find minimal transfer size suitable for DMA mode
2021 ourport->min_dma_size = max_t(int, ourport->port.fifosize,
2022 dma_get_cache_alignment());
2024 dev_dbg(&pdev->dev, "%s: initialising port %p...\n", __func__, ourport);
2026 ret = s3c24xx_serial_init_port(ourport, pdev);
2030 if (!s3c24xx_uart_drv.state) {
2031 ret = uart_register_driver(&s3c24xx_uart_drv);
2033 pr_err("Failed to register Samsung UART driver\n");
2038 dev_dbg(&pdev->dev, "%s: adding port\n", __func__);
2039 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
2040 platform_set_drvdata(pdev, &ourport->port);
2043 * Deactivate the clock enabled in s3c24xx_serial_init_port here,
2044 * so that a potential re-enablement through the pm-callback overlaps
2045 * and keeps the clock enabled in this case.
2047 clk_disable_unprepare(ourport->clk);
2048 if (!IS_ERR(ourport->baudclk))
2049 clk_disable_unprepare(ourport->baudclk);
2056 static void s3c24xx_serial_remove(struct platform_device *dev)
2058 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
2061 uart_remove_one_port(&s3c24xx_uart_drv, port);
2064 uart_unregister_driver(&s3c24xx_uart_drv);
2067 /* UART power management code */
2068 #ifdef CONFIG_PM_SLEEP
2069 static int s3c24xx_serial_suspend(struct device *dev)
2071 struct uart_port *port = s3c24xx_dev_to_port(dev);
2074 uart_suspend_port(&s3c24xx_uart_drv, port);
2079 static int s3c24xx_serial_resume(struct device *dev)
2081 struct uart_port *port = s3c24xx_dev_to_port(dev);
2082 struct s3c24xx_uart_port *ourport = to_ourport(port);
2085 clk_prepare_enable(ourport->clk);
2086 if (!IS_ERR(ourport->baudclk))
2087 clk_prepare_enable(ourport->baudclk);
2088 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
2089 if (!IS_ERR(ourport->baudclk))
2090 clk_disable_unprepare(ourport->baudclk);
2091 clk_disable_unprepare(ourport->clk);
2093 uart_resume_port(&s3c24xx_uart_drv, port);
2099 static int s3c24xx_serial_resume_noirq(struct device *dev)
2101 struct uart_port *port = s3c24xx_dev_to_port(dev);
2102 struct s3c24xx_uart_port *ourport = to_ourport(port);
2105 /* restore IRQ mask */
2106 switch (ourport->info->type) {
2107 case TYPE_S3C6400: {
2108 unsigned int uintm = 0xf;
2110 if (ourport->tx_enabled)
2111 uintm &= ~S3C64XX_UINTM_TXD_MSK;
2112 if (ourport->rx_enabled)
2113 uintm &= ~S3C64XX_UINTM_RXD_MSK;
2114 clk_prepare_enable(ourport->clk);
2115 if (!IS_ERR(ourport->baudclk))
2116 clk_prepare_enable(ourport->baudclk);
2117 wr_regl(port, S3C64XX_UINTM, uintm);
2118 if (!IS_ERR(ourport->baudclk))
2119 clk_disable_unprepare(ourport->baudclk);
2120 clk_disable_unprepare(ourport->clk);
2123 case TYPE_APPLE_S5L: {
2127 ret = clk_prepare_enable(ourport->clk);
2129 dev_err(dev, "clk_enable clk failed: %d\n", ret);
2132 if (!IS_ERR(ourport->baudclk)) {
2133 ret = clk_prepare_enable(ourport->baudclk);
2135 dev_err(dev, "clk_enable baudclk failed: %d\n", ret);
2136 clk_disable_unprepare(ourport->clk);
2141 ucon = rd_regl(port, S3C2410_UCON);
2143 ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
2144 APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
2145 APPLE_S5L_UCON_RXTO_ENA_MSK);
2147 if (ourport->tx_enabled)
2148 ucon |= APPLE_S5L_UCON_TXTHRESH_ENA_MSK;
2149 if (ourport->rx_enabled)
2150 ucon |= APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
2151 APPLE_S5L_UCON_RXTO_ENA_MSK;
2153 wr_regl(port, S3C2410_UCON, ucon);
2155 if (!IS_ERR(ourport->baudclk))
2156 clk_disable_unprepare(ourport->baudclk);
2157 clk_disable_unprepare(ourport->clk);
2168 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
2169 SET_SYSTEM_SLEEP_PM_OPS(s3c24xx_serial_suspend, s3c24xx_serial_resume)
2170 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, s3c24xx_serial_resume_noirq)
2172 #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
2174 #else /* !CONFIG_PM_SLEEP */
2176 #define SERIAL_SAMSUNG_PM_OPS NULL
2177 #endif /* CONFIG_PM_SLEEP */
2181 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2183 static struct uart_port *cons_uart;
2186 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
2188 const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
2189 unsigned long ufstat, utrstat;
2191 if (ufcon & S3C2410_UFCON_FIFOMODE) {
2192 /* fifo mode - check amount of data in fifo registers... */
2194 ufstat = rd_regl(port, S3C2410_UFSTAT);
2195 return (ufstat & info->tx_fifofull) ? 0 : 1;
2198 /* in non-fifo mode, we go and use the tx buffer empty */
2200 utrstat = rd_regl(port, S3C2410_UTRSTAT);
2201 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
2205 s3c24xx_port_configured(unsigned int ucon)
2207 /* consider the serial port configured if the tx/rx mode set */
2208 return (ucon & 0xf) != 0;
2211 #ifdef CONFIG_CONSOLE_POLL
2213 * Console polling routines for writing and reading from the uart while
2214 * in an interrupt or debug context.
2217 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
2219 const struct s3c24xx_uart_port *ourport = to_ourport(port);
2220 unsigned int ufstat;
2222 ufstat = rd_regl(port, S3C2410_UFSTAT);
2223 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
2224 return NO_POLL_CHAR;
2226 return rd_reg(port, S3C2410_URXH);
2229 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
2232 unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2233 unsigned int ucon = rd_regl(port, S3C2410_UCON);
2235 /* not possible to xmit on unconfigured port */
2236 if (!s3c24xx_port_configured(ucon))
2239 while (!s3c24xx_serial_console_txrdy(port, ufcon))
2241 wr_reg(port, S3C2410_UTXH, c);
2244 #endif /* CONFIG_CONSOLE_POLL */
2247 s3c24xx_serial_console_putchar(struct uart_port *port, unsigned char ch)
2249 unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2251 while (!s3c24xx_serial_console_txrdy(port, ufcon))
2253 wr_reg(port, S3C2410_UTXH, ch);
2257 s3c24xx_serial_console_write(struct console *co, const char *s,
2260 unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
2261 unsigned long flags;
2264 /* not possible to xmit on unconfigured port */
2265 if (!s3c24xx_port_configured(ucon))
2268 if (cons_uart->sysrq)
2270 else if (oops_in_progress)
2271 locked = uart_port_trylock_irqsave(cons_uart, &flags);
2273 uart_port_lock_irqsave(cons_uart, &flags);
2275 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
2278 uart_port_unlock_irqrestore(cons_uart, flags);
2281 /* Shouldn't be __init, as it can be instantiated from other module */
2283 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
2284 int *parity, int *bits)
2289 unsigned int ubrdiv;
2291 unsigned int clk_sel;
2292 char clk_name[MAX_CLK_NAME_LENGTH];
2294 ulcon = rd_regl(port, S3C2410_ULCON);
2295 ucon = rd_regl(port, S3C2410_UCON);
2296 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
2298 if (s3c24xx_port_configured(ucon)) {
2299 switch (ulcon & S3C2410_LCON_CSMASK) {
2300 case S3C2410_LCON_CS5:
2303 case S3C2410_LCON_CS6:
2306 case S3C2410_LCON_CS7:
2309 case S3C2410_LCON_CS8:
2315 switch (ulcon & S3C2410_LCON_PMASK) {
2316 case S3C2410_LCON_PEVEN:
2320 case S3C2410_LCON_PODD:
2324 case S3C2410_LCON_PNONE:
2329 /* now calculate the baud rate */
2331 clk_sel = s3c24xx_serial_getsource(port);
2332 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
2334 clk = clk_get(port->dev, clk_name);
2336 rate = clk_get_rate(clk);
2340 *baud = rate / (16 * (ubrdiv + 1));
2341 dev_dbg(port->dev, "calculated baud %d\n", *baud);
2345 /* Shouldn't be __init, as it can be instantiated from other module */
2347 s3c24xx_serial_console_setup(struct console *co, char *options)
2349 struct uart_port *port;
2355 /* is this a valid port */
2357 if (co->index == -1 || co->index >= UART_NR)
2360 port = &s3c24xx_serial_ports[co->index].port;
2362 /* is the port configured? */
2364 if (port->mapbase == 0x0)
2370 * Check whether an invalid uart number has been specified, and
2371 * if so, search for the first available port that does have
2375 uart_parse_options(options, &baud, &parity, &bits, &flow);
2377 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
2379 dev_dbg(port->dev, "baud %d\n", baud);
2381 return uart_set_options(port, co, baud, parity, bits, flow);
2384 static struct console s3c24xx_serial_console = {
2385 .name = S3C24XX_SERIAL_NAME,
2386 .device = uart_console_device,
2387 .flags = CON_PRINTBUFFER,
2389 .write = s3c24xx_serial_console_write,
2390 .setup = s3c24xx_serial_console_setup,
2391 .data = &s3c24xx_uart_drv,
2393 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
2395 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
2396 static const struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
2398 .name = "Samsung S3C6400 UART",
2399 .type = TYPE_S3C6400,
2400 .port_type = PORT_S3C6400,
2403 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2404 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2405 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2406 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2407 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2408 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2409 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2411 .clksel_mask = S3C6400_UCON_CLKMASK,
2412 .clksel_shift = S3C6400_UCON_CLKSHIFT,
2415 .ucon = S3C2410_UCON_DEFAULT,
2416 .ufcon = S3C2410_UFCON_DEFAULT,
2419 #define S3C6400_SERIAL_DRV_DATA (&s3c6400_serial_drv_data)
2421 #define S3C6400_SERIAL_DRV_DATA NULL
2424 #ifdef CONFIG_CPU_S5PV210
2425 static const struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
2427 .name = "Samsung S5PV210 UART",
2428 .type = TYPE_S3C6400,
2429 .port_type = PORT_S3C6400,
2431 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
2432 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
2433 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
2434 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
2435 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
2436 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
2437 .def_clk_sel = S3C2410_UCON_CLKSEL0,
2439 .clksel_mask = S5PV210_UCON_CLKMASK,
2440 .clksel_shift = S5PV210_UCON_CLKSHIFT,
2443 .ucon = S5PV210_UCON_DEFAULT,
2444 .ufcon = S5PV210_UFCON_DEFAULT,
2446 .fifosize = { 256, 64, 16, 16 },
2448 #define S5PV210_SERIAL_DRV_DATA (&s5pv210_serial_drv_data)
2450 #define S5PV210_SERIAL_DRV_DATA NULL
2453 #if defined(CONFIG_ARCH_EXYNOS)
2454 #define EXYNOS_COMMON_SERIAL_DRV_DATA() \
2456 .name = "Samsung Exynos UART", \
2457 .type = TYPE_S3C6400, \
2458 .port_type = PORT_S3C6400, \
2460 .rx_fifomask = S5PV210_UFSTAT_RXMASK, \
2461 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \
2462 .rx_fifofull = S5PV210_UFSTAT_RXFULL, \
2463 .tx_fifofull = S5PV210_UFSTAT_TXFULL, \
2464 .tx_fifomask = S5PV210_UFSTAT_TXMASK, \
2465 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \
2466 .def_clk_sel = S3C2410_UCON_CLKSEL0, \
2469 .clksel_shift = 0, \
2472 .ucon = S5PV210_UCON_DEFAULT, \
2473 .ufcon = S5PV210_UFCON_DEFAULT, \
2477 static const struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
2478 EXYNOS_COMMON_SERIAL_DRV_DATA(),
2479 .fifosize = { 256, 64, 16, 16 },
2482 static const struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
2483 EXYNOS_COMMON_SERIAL_DRV_DATA(),
2484 .fifosize = { 64, 256, 16, 256 },
2487 static const struct s3c24xx_serial_drv_data exynos850_serial_drv_data = {
2488 EXYNOS_COMMON_SERIAL_DRV_DATA(),
2489 .fifosize = { 256, 64, 64, 64 },
2493 * Common drv_data struct for platforms that specify samsung,uart-fifosize in
2496 static const struct s3c24xx_serial_drv_data exynos_fifoszdt_serial_drv_data = {
2497 EXYNOS_COMMON_SERIAL_DRV_DATA(),
2501 #define EXYNOS4210_SERIAL_DRV_DATA (&exynos4210_serial_drv_data)
2502 #define EXYNOS5433_SERIAL_DRV_DATA (&exynos5433_serial_drv_data)
2503 #define EXYNOS850_SERIAL_DRV_DATA (&exynos850_serial_drv_data)
2504 #define EXYNOS_FIFOSZDT_DRV_DATA (&exynos_fifoszdt_serial_drv_data)
2507 #define EXYNOS4210_SERIAL_DRV_DATA NULL
2508 #define EXYNOS5433_SERIAL_DRV_DATA NULL
2509 #define EXYNOS850_SERIAL_DRV_DATA NULL
2510 #define EXYNOS_FIFOSZDT_DRV_DATA NULL
2513 #ifdef CONFIG_ARCH_APPLE
2514 static const struct s3c24xx_serial_drv_data s5l_serial_drv_data = {
2516 .name = "Apple S5L UART",
2517 .type = TYPE_APPLE_S5L,
2518 .port_type = PORT_8250,
2520 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
2521 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
2522 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
2523 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
2524 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
2525 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
2526 .def_clk_sel = S3C2410_UCON_CLKSEL0,
2530 .ucon_mask = APPLE_S5L_UCON_MASK,
2533 .ucon = APPLE_S5L_UCON_DEFAULT,
2534 .ufcon = S3C2410_UFCON_DEFAULT,
2537 #define S5L_SERIAL_DRV_DATA (&s5l_serial_drv_data)
2539 #define S5L_SERIAL_DRV_DATA NULL
2542 #if defined(CONFIG_ARCH_ARTPEC)
2543 static const struct s3c24xx_serial_drv_data artpec8_serial_drv_data = {
2545 .name = "Axis ARTPEC-8 UART",
2546 .type = TYPE_S3C6400,
2547 .port_type = PORT_S3C6400,
2550 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
2551 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
2552 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
2553 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
2554 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
2555 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
2556 .def_clk_sel = S3C2410_UCON_CLKSEL0,
2562 .ucon = S5PV210_UCON_DEFAULT,
2563 .ufcon = S5PV210_UFCON_DEFAULT,
2567 #define ARTPEC8_SERIAL_DRV_DATA (&artpec8_serial_drv_data)
2569 #define ARTPEC8_SERIAL_DRV_DATA (NULL)
2572 static const struct platform_device_id s3c24xx_serial_driver_ids[] = {
2574 .name = "s3c6400-uart",
2575 .driver_data = (kernel_ulong_t)S3C6400_SERIAL_DRV_DATA,
2577 .name = "s5pv210-uart",
2578 .driver_data = (kernel_ulong_t)S5PV210_SERIAL_DRV_DATA,
2580 .name = "exynos4210-uart",
2581 .driver_data = (kernel_ulong_t)EXYNOS4210_SERIAL_DRV_DATA,
2583 .name = "exynos5433-uart",
2584 .driver_data = (kernel_ulong_t)EXYNOS5433_SERIAL_DRV_DATA,
2587 .driver_data = (kernel_ulong_t)S5L_SERIAL_DRV_DATA,
2589 .name = "exynos850-uart",
2590 .driver_data = (kernel_ulong_t)EXYNOS850_SERIAL_DRV_DATA,
2592 .name = "artpec8-uart",
2593 .driver_data = (kernel_ulong_t)ARTPEC8_SERIAL_DRV_DATA,
2595 .name = "gs101-uart",
2596 .driver_data = (kernel_ulong_t)EXYNOS_FIFOSZDT_DRV_DATA,
2600 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
2603 static const struct of_device_id s3c24xx_uart_dt_match[] = {
2604 { .compatible = "samsung,s3c6400-uart",
2605 .data = S3C6400_SERIAL_DRV_DATA },
2606 { .compatible = "samsung,s5pv210-uart",
2607 .data = S5PV210_SERIAL_DRV_DATA },
2608 { .compatible = "samsung,exynos4210-uart",
2609 .data = EXYNOS4210_SERIAL_DRV_DATA },
2610 { .compatible = "samsung,exynos5433-uart",
2611 .data = EXYNOS5433_SERIAL_DRV_DATA },
2612 { .compatible = "apple,s5l-uart",
2613 .data = S5L_SERIAL_DRV_DATA },
2614 { .compatible = "samsung,exynos850-uart",
2615 .data = EXYNOS850_SERIAL_DRV_DATA },
2616 { .compatible = "axis,artpec8-uart",
2617 .data = ARTPEC8_SERIAL_DRV_DATA },
2618 { .compatible = "google,gs101-uart",
2619 .data = EXYNOS_FIFOSZDT_DRV_DATA },
2622 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
2625 static struct platform_driver samsung_serial_driver = {
2626 .probe = s3c24xx_serial_probe,
2627 .remove_new = s3c24xx_serial_remove,
2628 .id_table = s3c24xx_serial_driver_ids,
2630 .name = "samsung-uart",
2631 .pm = SERIAL_SAMSUNG_PM_OPS,
2632 .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
2636 static int __init samsung_serial_init(void)
2640 s3c24xx_serial_register_console();
2642 ret = platform_driver_register(&samsung_serial_driver);
2644 s3c24xx_serial_unregister_console();
2651 static void __exit samsung_serial_exit(void)
2653 platform_driver_unregister(&samsung_serial_driver);
2654 s3c24xx_serial_unregister_console();
2657 module_init(samsung_serial_init);
2658 module_exit(samsung_serial_exit);
2660 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2665 static void wr_reg_barrier(const struct uart_port *port, u32 reg, u32 val)
2667 switch (port->iotype) {
2669 writeb(val, portaddr(port, reg));
2672 writel(val, portaddr(port, reg));
2677 struct samsung_early_console_data {
2682 static void samsung_early_busyuart(const struct uart_port *port)
2684 while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
2688 static void samsung_early_busyuart_fifo(const struct uart_port *port)
2690 const struct samsung_early_console_data *data = port->private_data;
2692 while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
2696 static void samsung_early_putc(struct uart_port *port, unsigned char c)
2698 if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
2699 samsung_early_busyuart_fifo(port);
2701 samsung_early_busyuart(port);
2703 wr_reg_barrier(port, S3C2410_UTXH, c);
2706 static void samsung_early_write(struct console *con, const char *s,
2709 struct earlycon_device *dev = con->data;
2711 uart_console_write(&dev->port, s, n, samsung_early_putc);
2714 static int samsung_early_read(struct console *con, char *s, unsigned int n)
2716 struct earlycon_device *dev = con->data;
2717 const struct samsung_early_console_data *data = dev->port.private_data;
2718 int ch, ufstat, num_read = 0;
2720 while (num_read < n) {
2721 ufstat = rd_regl(&dev->port, S3C2410_UFSTAT);
2722 if (!(ufstat & data->rxfifo_mask))
2724 ch = rd_reg(&dev->port, S3C2410_URXH);
2725 if (ch == NO_POLL_CHAR)
2734 static int __init samsung_early_console_setup(struct earlycon_device *device,
2737 if (!device->port.membase)
2740 device->con->write = samsung_early_write;
2741 device->con->read = samsung_early_read;
2746 static struct samsung_early_console_data s3c2410_early_console_data = {
2747 .txfull_mask = S3C2410_UFSTAT_TXFULL,
2748 .rxfifo_mask = S3C2410_UFSTAT_RXFULL | S3C2410_UFSTAT_RXMASK,
2752 static struct samsung_early_console_data s3c2440_early_console_data = {
2753 .txfull_mask = S3C2440_UFSTAT_TXFULL,
2754 .rxfifo_mask = S3C2440_UFSTAT_RXFULL | S3C2440_UFSTAT_RXMASK,
2757 static int __init s3c2440_early_console_setup(struct earlycon_device *device,
2760 device->port.private_data = &s3c2440_early_console_data;
2761 return samsung_early_console_setup(device, opt);
2764 OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
2765 s3c2440_early_console_setup);
2767 /* S5PV210, Exynos */
2768 static struct samsung_early_console_data s5pv210_early_console_data = {
2769 .txfull_mask = S5PV210_UFSTAT_TXFULL,
2770 .rxfifo_mask = S5PV210_UFSTAT_RXFULL | S5PV210_UFSTAT_RXMASK,
2773 static int __init s5pv210_early_console_setup(struct earlycon_device *device,
2776 device->port.private_data = &s5pv210_early_console_data;
2777 return samsung_early_console_setup(device, opt);
2780 OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
2781 s5pv210_early_console_setup);
2782 OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
2783 s5pv210_early_console_setup);
2784 OF_EARLYCON_DECLARE(artpec8, "axis,artpec8-uart",
2785 s5pv210_early_console_setup);
2788 static int __init apple_s5l_early_console_setup(struct earlycon_device *device,
2791 /* Close enough to S3C2410 for earlycon... */
2792 device->port.private_data = &s3c2410_early_console_data;
2795 /* ... but we need to override the existing fixmap entry as nGnRnE */
2796 __set_fixmap(FIX_EARLYCON_MEM_BASE, device->port.mapbase,
2797 __pgprot(PROT_DEVICE_nGnRnE));
2799 return samsung_early_console_setup(device, opt);
2802 OF_EARLYCON_DECLARE(s5l, "apple,s5l-uart", apple_s5l_early_console_setup);
2805 MODULE_ALIAS("platform:samsung-uart");
2806 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
2807 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
2808 MODULE_LICENSE("GPL v2");