2 * Driver for msm7k serial device and console
4 * Copyright (C) 2007 Google, Inc.
5 * Author: Robert Love <rlove@google.com>
6 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
8 * This software is licensed under the terms of the GNU General Public
9 * License version 2, as published by the Free Software Foundation, and
10 * may be copied, distributed, and modified under those terms.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 #if defined(CONFIG_SERIAL_MSM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
19 # define SUPPORT_SYSRQ
22 #include <linux/kernel.h>
23 #include <linux/atomic.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/dmaengine.h>
26 #include <linux/module.h>
28 #include <linux/ioport.h>
29 #include <linux/interrupt.h>
30 #include <linux/init.h>
31 #include <linux/console.h>
32 #include <linux/tty.h>
33 #include <linux/tty_flip.h>
34 #include <linux/serial_core.h>
35 #include <linux/slab.h>
36 #include <linux/clk.h>
37 #include <linux/platform_device.h>
38 #include <linux/delay.h>
40 #include <linux/of_device.h>
41 #include <linux/wait.h>
43 #define UART_MR1 0x0000
45 #define UART_MR1_AUTO_RFR_LEVEL0 0x3F
46 #define UART_MR1_AUTO_RFR_LEVEL1 0x3FF00
47 #define UART_DM_MR1_AUTO_RFR_LEVEL1 0xFFFFFF00
48 #define UART_MR1_RX_RDY_CTL BIT(7)
49 #define UART_MR1_CTS_CTL BIT(6)
51 #define UART_MR2 0x0004
52 #define UART_MR2_ERROR_MODE BIT(6)
53 #define UART_MR2_BITS_PER_CHAR 0x30
54 #define UART_MR2_BITS_PER_CHAR_5 (0x0 << 4)
55 #define UART_MR2_BITS_PER_CHAR_6 (0x1 << 4)
56 #define UART_MR2_BITS_PER_CHAR_7 (0x2 << 4)
57 #define UART_MR2_BITS_PER_CHAR_8 (0x3 << 4)
58 #define UART_MR2_STOP_BIT_LEN_ONE (0x1 << 2)
59 #define UART_MR2_STOP_BIT_LEN_TWO (0x3 << 2)
60 #define UART_MR2_PARITY_MODE_NONE 0x0
61 #define UART_MR2_PARITY_MODE_ODD 0x1
62 #define UART_MR2_PARITY_MODE_EVEN 0x2
63 #define UART_MR2_PARITY_MODE_SPACE 0x3
64 #define UART_MR2_PARITY_MODE 0x3
66 #define UART_CSR 0x0008
68 #define UART_TF 0x000C
69 #define UARTDM_TF 0x0070
71 #define UART_CR 0x0010
72 #define UART_CR_CMD_NULL (0 << 4)
73 #define UART_CR_CMD_RESET_RX (1 << 4)
74 #define UART_CR_CMD_RESET_TX (2 << 4)
75 #define UART_CR_CMD_RESET_ERR (3 << 4)
76 #define UART_CR_CMD_RESET_BREAK_INT (4 << 4)
77 #define UART_CR_CMD_START_BREAK (5 << 4)
78 #define UART_CR_CMD_STOP_BREAK (6 << 4)
79 #define UART_CR_CMD_RESET_CTS (7 << 4)
80 #define UART_CR_CMD_RESET_STALE_INT (8 << 4)
81 #define UART_CR_CMD_PACKET_MODE (9 << 4)
82 #define UART_CR_CMD_MODE_RESET (12 << 4)
83 #define UART_CR_CMD_SET_RFR (13 << 4)
84 #define UART_CR_CMD_RESET_RFR (14 << 4)
85 #define UART_CR_CMD_PROTECTION_EN (16 << 4)
86 #define UART_CR_CMD_STALE_EVENT_DISABLE (6 << 8)
87 #define UART_CR_CMD_STALE_EVENT_ENABLE (80 << 4)
88 #define UART_CR_CMD_FORCE_STALE (4 << 8)
89 #define UART_CR_CMD_RESET_TX_READY (3 << 8)
90 #define UART_CR_TX_DISABLE BIT(3)
91 #define UART_CR_TX_ENABLE BIT(2)
92 #define UART_CR_RX_DISABLE BIT(1)
93 #define UART_CR_RX_ENABLE BIT(0)
94 #define UART_CR_CMD_RESET_RXBREAK_START ((1 << 11) | (2 << 4))
96 #define UART_IMR 0x0014
97 #define UART_IMR_TXLEV BIT(0)
98 #define UART_IMR_RXSTALE BIT(3)
99 #define UART_IMR_RXLEV BIT(4)
100 #define UART_IMR_DELTA_CTS BIT(5)
101 #define UART_IMR_CURRENT_CTS BIT(6)
102 #define UART_IMR_RXBREAK_START BIT(10)
104 #define UART_IPR_RXSTALE_LAST 0x20
105 #define UART_IPR_STALE_LSB 0x1F
106 #define UART_IPR_STALE_TIMEOUT_MSB 0x3FF80
107 #define UART_DM_IPR_STALE_TIMEOUT_MSB 0xFFFFFF80
109 #define UART_IPR 0x0018
110 #define UART_TFWR 0x001C
111 #define UART_RFWR 0x0020
112 #define UART_HCR 0x0024
114 #define UART_MREG 0x0028
115 #define UART_NREG 0x002C
116 #define UART_DREG 0x0030
117 #define UART_MNDREG 0x0034
118 #define UART_IRDA 0x0038
119 #define UART_MISR_MODE 0x0040
120 #define UART_MISR_RESET 0x0044
121 #define UART_MISR_EXPORT 0x0048
122 #define UART_MISR_VAL 0x004C
123 #define UART_TEST_CTRL 0x0050
125 #define UART_SR 0x0008
126 #define UART_SR_HUNT_CHAR BIT(7)
127 #define UART_SR_RX_BREAK BIT(6)
128 #define UART_SR_PAR_FRAME_ERR BIT(5)
129 #define UART_SR_OVERRUN BIT(4)
130 #define UART_SR_TX_EMPTY BIT(3)
131 #define UART_SR_TX_READY BIT(2)
132 #define UART_SR_RX_FULL BIT(1)
133 #define UART_SR_RX_READY BIT(0)
135 #define UART_RF 0x000C
136 #define UARTDM_RF 0x0070
137 #define UART_MISR 0x0010
138 #define UART_ISR 0x0014
139 #define UART_ISR_TX_READY BIT(7)
141 #define UARTDM_RXFS 0x50
142 #define UARTDM_RXFS_BUF_SHIFT 0x7
143 #define UARTDM_RXFS_BUF_MASK 0x7
145 #define UARTDM_DMEN 0x3C
146 #define UARTDM_DMEN_RX_SC_ENABLE BIT(5)
147 #define UARTDM_DMEN_TX_SC_ENABLE BIT(4)
149 #define UARTDM_DMEN_TX_BAM_ENABLE BIT(2) /* UARTDM_1P4 */
150 #define UARTDM_DMEN_TX_DM_ENABLE BIT(0) /* < UARTDM_1P4 */
152 #define UARTDM_DMEN_RX_BAM_ENABLE BIT(3) /* UARTDM_1P4 */
153 #define UARTDM_DMEN_RX_DM_ENABLE BIT(1) /* < UARTDM_1P4 */
155 #define UARTDM_DMRX 0x34
156 #define UARTDM_NCF_TX 0x40
157 #define UARTDM_RX_TOTAL_SNAP 0x38
159 #define UARTDM_BURST_SIZE 16 /* in bytes */
160 #define UARTDM_TX_AIGN(x) ((x) & ~0x3) /* valid for > 1p3 */
161 #define UARTDM_TX_MAX 256 /* in bytes, valid for <= 1p3 */
162 #define UARTDM_RX_SIZE (UART_XMIT_SIZE / 4)
172 struct dma_chan *chan;
173 enum dma_data_direction dir;
179 struct dma_async_tx_descriptor *desc;
183 struct uart_port uart;
189 unsigned int old_snap_state;
191 struct msm_dma tx_dma;
192 struct msm_dma rx_dma;
195 #define UART_TO_MSM(uart_port) container_of(uart_port, struct msm_port, uart)
198 void msm_write(struct uart_port *port, unsigned int val, unsigned int off)
200 writel_relaxed(val, port->membase + off);
204 unsigned int msm_read(struct uart_port *port, unsigned int off)
206 return readl_relaxed(port->membase + off);
210 * Setup the MND registers to use the TCXO clock.
212 static void msm_serial_set_mnd_regs_tcxo(struct uart_port *port)
214 msm_write(port, 0x06, UART_MREG);
215 msm_write(port, 0xF1, UART_NREG);
216 msm_write(port, 0x0F, UART_DREG);
217 msm_write(port, 0x1A, UART_MNDREG);
218 port->uartclk = 1843200;
222 * Setup the MND registers to use the TCXO clock divided by 4.
224 static void msm_serial_set_mnd_regs_tcxoby4(struct uart_port *port)
226 msm_write(port, 0x18, UART_MREG);
227 msm_write(port, 0xF6, UART_NREG);
228 msm_write(port, 0x0F, UART_DREG);
229 msm_write(port, 0x0A, UART_MNDREG);
230 port->uartclk = 1843200;
233 static void msm_serial_set_mnd_regs(struct uart_port *port)
235 struct msm_port *msm_port = UART_TO_MSM(port);
238 * These registers don't exist so we change the clk input rate
239 * on uartdm hardware instead
241 if (msm_port->is_uartdm)
244 if (port->uartclk == 19200000)
245 msm_serial_set_mnd_regs_tcxo(port);
246 else if (port->uartclk == 4800000)
247 msm_serial_set_mnd_regs_tcxoby4(port);
250 static void msm_handle_tx(struct uart_port *port);
251 static void msm_start_rx_dma(struct msm_port *msm_port);
253 static void msm_stop_dma(struct uart_port *port, struct msm_dma *dma)
255 struct device *dev = port->dev;
262 dmaengine_terminate_all(dma->chan);
265 * DMA Stall happens if enqueue and flush command happens concurrently.
266 * For example before changing the baud rate/protocol configuration and
267 * sending flush command to ADM, disable the channel of UARTDM.
268 * Note: should not reset the receiver here immediately as it is not
269 * suggested to do disable/reset or reset/disable at the same time.
271 val = msm_read(port, UARTDM_DMEN);
272 val &= ~dma->enable_bit;
273 msm_write(port, val, UARTDM_DMEN);
276 dma_unmap_single(dev, dma->phys, mapped, dma->dir);
279 static void msm_release_dma(struct msm_port *msm_port)
283 dma = &msm_port->tx_dma;
285 msm_stop_dma(&msm_port->uart, dma);
286 dma_release_channel(dma->chan);
289 memset(dma, 0, sizeof(*dma));
291 dma = &msm_port->rx_dma;
293 msm_stop_dma(&msm_port->uart, dma);
294 dma_release_channel(dma->chan);
298 memset(dma, 0, sizeof(*dma));
301 static void msm_request_tx_dma(struct msm_port *msm_port, resource_size_t base)
303 struct device *dev = msm_port->uart.dev;
304 struct dma_slave_config conf;
309 dma = &msm_port->tx_dma;
311 /* allocate DMA resources, if available */
312 dma->chan = dma_request_slave_channel_reason(dev, "tx");
313 if (IS_ERR(dma->chan))
316 of_property_read_u32(dev->of_node, "qcom,tx-crci", &crci);
318 memset(&conf, 0, sizeof(conf));
319 conf.direction = DMA_MEM_TO_DEV;
320 conf.device_fc = true;
321 conf.dst_addr = base + UARTDM_TF;
322 conf.dst_maxburst = UARTDM_BURST_SIZE;
323 conf.slave_id = crci;
325 ret = dmaengine_slave_config(dma->chan, &conf);
329 dma->dir = DMA_TO_DEVICE;
331 if (msm_port->is_uartdm < UARTDM_1P4)
332 dma->enable_bit = UARTDM_DMEN_TX_DM_ENABLE;
334 dma->enable_bit = UARTDM_DMEN_TX_BAM_ENABLE;
339 dma_release_channel(dma->chan);
341 memset(dma, 0, sizeof(*dma));
344 static void msm_request_rx_dma(struct msm_port *msm_port, resource_size_t base)
346 struct device *dev = msm_port->uart.dev;
347 struct dma_slave_config conf;
352 dma = &msm_port->rx_dma;
354 /* allocate DMA resources, if available */
355 dma->chan = dma_request_slave_channel_reason(dev, "rx");
356 if (IS_ERR(dma->chan))
359 of_property_read_u32(dev->of_node, "qcom,rx-crci", &crci);
361 dma->virt = kzalloc(UARTDM_RX_SIZE, GFP_KERNEL);
365 memset(&conf, 0, sizeof(conf));
366 conf.direction = DMA_DEV_TO_MEM;
367 conf.device_fc = true;
368 conf.src_addr = base + UARTDM_RF;
369 conf.src_maxburst = UARTDM_BURST_SIZE;
370 conf.slave_id = crci;
372 ret = dmaengine_slave_config(dma->chan, &conf);
376 dma->dir = DMA_FROM_DEVICE;
378 if (msm_port->is_uartdm < UARTDM_1P4)
379 dma->enable_bit = UARTDM_DMEN_RX_DM_ENABLE;
381 dma->enable_bit = UARTDM_DMEN_RX_BAM_ENABLE;
387 dma_release_channel(dma->chan);
389 memset(dma, 0, sizeof(*dma));
392 static inline void msm_wait_for_xmitr(struct uart_port *port)
394 unsigned int timeout = 500000;
396 while (!(msm_read(port, UART_SR) & UART_SR_TX_EMPTY)) {
397 if (msm_read(port, UART_ISR) & UART_ISR_TX_READY)
403 msm_write(port, UART_CR_CMD_RESET_TX_READY, UART_CR);
406 static void msm_stop_tx(struct uart_port *port)
408 struct msm_port *msm_port = UART_TO_MSM(port);
410 msm_port->imr &= ~UART_IMR_TXLEV;
411 msm_write(port, msm_port->imr, UART_IMR);
414 static void msm_start_tx(struct uart_port *port)
416 struct msm_port *msm_port = UART_TO_MSM(port);
417 struct msm_dma *dma = &msm_port->tx_dma;
419 /* Already started in DMA mode */
423 msm_port->imr |= UART_IMR_TXLEV;
424 msm_write(port, msm_port->imr, UART_IMR);
427 static void msm_reset_dm_count(struct uart_port *port, int count)
429 msm_wait_for_xmitr(port);
430 msm_write(port, count, UARTDM_NCF_TX);
431 msm_read(port, UARTDM_NCF_TX);
434 static void msm_complete_tx_dma(void *args)
436 struct msm_port *msm_port = args;
437 struct uart_port *port = &msm_port->uart;
438 struct circ_buf *xmit = &port->state->xmit;
439 struct msm_dma *dma = &msm_port->tx_dma;
440 struct dma_tx_state state;
441 enum dma_status status;
446 spin_lock_irqsave(&port->lock, flags);
448 /* Already stopped */
452 status = dmaengine_tx_status(dma->chan, dma->cookie, &state);
454 dma_unmap_single(port->dev, dma->phys, dma->count, dma->dir);
456 val = msm_read(port, UARTDM_DMEN);
457 val &= ~dma->enable_bit;
458 msm_write(port, val, UARTDM_DMEN);
460 if (msm_port->is_uartdm > UARTDM_1P3) {
461 msm_write(port, UART_CR_CMD_RESET_TX, UART_CR);
462 msm_write(port, UART_CR_TX_ENABLE, UART_CR);
465 count = dma->count - state.residue;
466 port->icount.tx += count;
470 xmit->tail &= UART_XMIT_SIZE - 1;
472 /* Restore "Tx FIFO below watermark" interrupt */
473 msm_port->imr |= UART_IMR_TXLEV;
474 msm_write(port, msm_port->imr, UART_IMR);
476 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
477 uart_write_wakeup(port);
481 spin_unlock_irqrestore(&port->lock, flags);
484 static int msm_handle_tx_dma(struct msm_port *msm_port, unsigned int count)
486 struct circ_buf *xmit = &msm_port->uart.state->xmit;
487 struct uart_port *port = &msm_port->uart;
488 struct msm_dma *dma = &msm_port->tx_dma;
493 cpu_addr = &xmit->buf[xmit->tail];
495 dma->phys = dma_map_single(port->dev, cpu_addr, count, dma->dir);
496 ret = dma_mapping_error(port->dev, dma->phys);
500 dma->desc = dmaengine_prep_slave_single(dma->chan, dma->phys,
501 count, DMA_MEM_TO_DEV,
509 dma->desc->callback = msm_complete_tx_dma;
510 dma->desc->callback_param = msm_port;
512 dma->cookie = dmaengine_submit(dma->desc);
513 ret = dma_submit_error(dma->cookie);
518 * Using DMA complete for Tx FIFO reload, no need for
519 * "Tx FIFO below watermark" one, disable it
521 msm_port->imr &= ~UART_IMR_TXLEV;
522 msm_write(port, msm_port->imr, UART_IMR);
526 val = msm_read(port, UARTDM_DMEN);
527 val |= dma->enable_bit;
529 if (msm_port->is_uartdm < UARTDM_1P4)
530 msm_write(port, val, UARTDM_DMEN);
532 msm_reset_dm_count(port, count);
534 if (msm_port->is_uartdm > UARTDM_1P3)
535 msm_write(port, val, UARTDM_DMEN);
537 dma_async_issue_pending(dma->chan);
540 dma_unmap_single(port->dev, dma->phys, count, dma->dir);
544 static void msm_complete_rx_dma(void *args)
546 struct msm_port *msm_port = args;
547 struct uart_port *port = &msm_port->uart;
548 struct tty_port *tport = &port->state->port;
549 struct msm_dma *dma = &msm_port->rx_dma;
550 int count = 0, i, sysrq;
554 spin_lock_irqsave(&port->lock, flags);
556 /* Already stopped */
560 val = msm_read(port, UARTDM_DMEN);
561 val &= ~dma->enable_bit;
562 msm_write(port, val, UARTDM_DMEN);
564 if (msm_read(port, UART_SR) & UART_SR_OVERRUN) {
565 port->icount.overrun++;
566 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
567 msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
570 count = msm_read(port, UARTDM_RX_TOTAL_SNAP);
572 port->icount.rx += count;
576 dma_unmap_single(port->dev, dma->phys, UARTDM_RX_SIZE, dma->dir);
578 for (i = 0; i < count; i++) {
579 char flag = TTY_NORMAL;
581 if (msm_port->break_detected && dma->virt[i] == 0) {
584 msm_port->break_detected = false;
585 if (uart_handle_break(port))
589 if (!(port->read_status_mask & UART_SR_RX_BREAK))
592 spin_unlock_irqrestore(&port->lock, flags);
593 sysrq = uart_handle_sysrq_char(port, dma->virt[i]);
594 spin_lock_irqsave(&port->lock, flags);
596 tty_insert_flip_char(tport, dma->virt[i], flag);
599 msm_start_rx_dma(msm_port);
601 spin_unlock_irqrestore(&port->lock, flags);
604 tty_flip_buffer_push(tport);
607 static void msm_start_rx_dma(struct msm_port *msm_port)
609 struct msm_dma *dma = &msm_port->rx_dma;
610 struct uart_port *uart = &msm_port->uart;
614 if (IS_ENABLED(CONFIG_CONSOLE_POLL))
620 dma->phys = dma_map_single(uart->dev, dma->virt,
621 UARTDM_RX_SIZE, dma->dir);
622 ret = dma_mapping_error(uart->dev, dma->phys);
626 dma->desc = dmaengine_prep_slave_single(dma->chan, dma->phys,
627 UARTDM_RX_SIZE, DMA_DEV_TO_MEM,
632 dma->desc->callback = msm_complete_rx_dma;
633 dma->desc->callback_param = msm_port;
635 dma->cookie = dmaengine_submit(dma->desc);
636 ret = dma_submit_error(dma->cookie);
640 * Using DMA for FIFO off-load, no need for "Rx FIFO over
641 * watermark" or "stale" interrupts, disable them
643 msm_port->imr &= ~(UART_IMR_RXLEV | UART_IMR_RXSTALE);
646 * Well, when DMA is ADM3 engine(implied by <= UARTDM v1.3),
647 * we need RXSTALE to flush input DMA fifo to memory
649 if (msm_port->is_uartdm < UARTDM_1P4)
650 msm_port->imr |= UART_IMR_RXSTALE;
652 msm_write(uart, msm_port->imr, UART_IMR);
654 dma->count = UARTDM_RX_SIZE;
656 dma_async_issue_pending(dma->chan);
658 msm_write(uart, UART_CR_CMD_RESET_STALE_INT, UART_CR);
659 msm_write(uart, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
661 val = msm_read(uart, UARTDM_DMEN);
662 val |= dma->enable_bit;
664 if (msm_port->is_uartdm < UARTDM_1P4)
665 msm_write(uart, val, UARTDM_DMEN);
667 msm_write(uart, UARTDM_RX_SIZE, UARTDM_DMRX);
669 if (msm_port->is_uartdm > UARTDM_1P3)
670 msm_write(uart, val, UARTDM_DMEN);
674 dma_unmap_single(uart->dev, dma->phys, UARTDM_RX_SIZE, dma->dir);
677 static void msm_stop_rx(struct uart_port *port)
679 struct msm_port *msm_port = UART_TO_MSM(port);
680 struct msm_dma *dma = &msm_port->rx_dma;
682 msm_port->imr &= ~(UART_IMR_RXLEV | UART_IMR_RXSTALE);
683 msm_write(port, msm_port->imr, UART_IMR);
686 msm_stop_dma(port, dma);
689 static void msm_enable_ms(struct uart_port *port)
691 struct msm_port *msm_port = UART_TO_MSM(port);
693 msm_port->imr |= UART_IMR_DELTA_CTS;
694 msm_write(port, msm_port->imr, UART_IMR);
697 static void msm_handle_rx_dm(struct uart_port *port, unsigned int misr)
699 struct tty_port *tport = &port->state->port;
702 struct msm_port *msm_port = UART_TO_MSM(port);
704 if ((msm_read(port, UART_SR) & UART_SR_OVERRUN)) {
705 port->icount.overrun++;
706 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
707 msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
710 if (misr & UART_IMR_RXSTALE) {
711 count = msm_read(port, UARTDM_RX_TOTAL_SNAP) -
712 msm_port->old_snap_state;
713 msm_port->old_snap_state = 0;
715 count = 4 * (msm_read(port, UART_RFWR));
716 msm_port->old_snap_state += count;
719 /* TODO: Precise error reporting */
721 port->icount.rx += count;
724 unsigned char buf[4];
725 int sysrq, r_count, i;
727 sr = msm_read(port, UART_SR);
728 if ((sr & UART_SR_RX_READY) == 0) {
729 msm_port->old_snap_state -= count;
733 ioread32_rep(port->membase + UARTDM_RF, buf, 1);
734 r_count = min_t(int, count, sizeof(buf));
736 for (i = 0; i < r_count; i++) {
737 char flag = TTY_NORMAL;
739 if (msm_port->break_detected && buf[i] == 0) {
742 msm_port->break_detected = false;
743 if (uart_handle_break(port))
747 if (!(port->read_status_mask & UART_SR_RX_BREAK))
750 spin_unlock(&port->lock);
751 sysrq = uart_handle_sysrq_char(port, buf[i]);
752 spin_lock(&port->lock);
754 tty_insert_flip_char(tport, buf[i], flag);
759 spin_unlock(&port->lock);
760 tty_flip_buffer_push(tport);
761 spin_lock(&port->lock);
763 if (misr & (UART_IMR_RXSTALE))
764 msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
765 msm_write(port, 0xFFFFFF, UARTDM_DMRX);
766 msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
769 msm_start_rx_dma(msm_port);
772 static void msm_handle_rx(struct uart_port *port)
774 struct tty_port *tport = &port->state->port;
778 * Handle overrun. My understanding of the hardware is that overrun
779 * is not tied to the RX buffer, so we handle the case out of band.
781 if ((msm_read(port, UART_SR) & UART_SR_OVERRUN)) {
782 port->icount.overrun++;
783 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
784 msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
787 /* and now the main RX loop */
788 while ((sr = msm_read(port, UART_SR)) & UART_SR_RX_READY) {
790 char flag = TTY_NORMAL;
793 c = msm_read(port, UART_RF);
795 if (sr & UART_SR_RX_BREAK) {
797 if (uart_handle_break(port))
799 } else if (sr & UART_SR_PAR_FRAME_ERR) {
800 port->icount.frame++;
805 /* Mask conditions we're ignorning. */
806 sr &= port->read_status_mask;
808 if (sr & UART_SR_RX_BREAK)
810 else if (sr & UART_SR_PAR_FRAME_ERR)
813 spin_unlock(&port->lock);
814 sysrq = uart_handle_sysrq_char(port, c);
815 spin_lock(&port->lock);
817 tty_insert_flip_char(tport, c, flag);
820 spin_unlock(&port->lock);
821 tty_flip_buffer_push(tport);
822 spin_lock(&port->lock);
825 static void msm_handle_tx_pio(struct uart_port *port, unsigned int tx_count)
827 struct circ_buf *xmit = &port->state->xmit;
828 struct msm_port *msm_port = UART_TO_MSM(port);
829 unsigned int num_chars;
830 unsigned int tf_pointer = 0;
833 if (msm_port->is_uartdm)
834 tf = port->membase + UARTDM_TF;
836 tf = port->membase + UART_TF;
838 if (tx_count && msm_port->is_uartdm)
839 msm_reset_dm_count(port, tx_count);
841 while (tf_pointer < tx_count) {
845 if (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
848 if (msm_port->is_uartdm)
849 num_chars = min(tx_count - tf_pointer,
850 (unsigned int)sizeof(buf));
854 for (i = 0; i < num_chars; i++) {
855 buf[i] = xmit->buf[xmit->tail + i];
859 iowrite32_rep(tf, buf, 1);
860 xmit->tail = (xmit->tail + num_chars) & (UART_XMIT_SIZE - 1);
861 tf_pointer += num_chars;
864 /* disable tx interrupts if nothing more to send */
865 if (uart_circ_empty(xmit))
868 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
869 uart_write_wakeup(port);
872 static void msm_handle_tx(struct uart_port *port)
874 struct msm_port *msm_port = UART_TO_MSM(port);
875 struct circ_buf *xmit = &msm_port->uart.state->xmit;
876 struct msm_dma *dma = &msm_port->tx_dma;
877 unsigned int pio_count, dma_count, dma_min;
883 if (msm_port->is_uartdm)
884 tf = port->membase + UARTDM_TF;
886 tf = port->membase + UART_TF;
888 buf[0] = port->x_char;
890 if (msm_port->is_uartdm)
891 msm_reset_dm_count(port, 1);
893 iowrite32_rep(tf, buf, 1);
899 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
904 pio_count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
905 dma_count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
907 dma_min = 1; /* Always DMA */
908 if (msm_port->is_uartdm > UARTDM_1P3) {
909 dma_count = UARTDM_TX_AIGN(dma_count);
910 dma_min = UARTDM_BURST_SIZE;
912 if (dma_count > UARTDM_TX_MAX)
913 dma_count = UARTDM_TX_MAX;
916 if (pio_count > port->fifosize)
917 pio_count = port->fifosize;
919 if (!dma->chan || dma_count < dma_min)
920 msm_handle_tx_pio(port, pio_count);
922 err = msm_handle_tx_dma(msm_port, dma_count);
924 if (err) /* fall back to PIO mode */
925 msm_handle_tx_pio(port, pio_count);
928 static void msm_handle_delta_cts(struct uart_port *port)
930 msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
932 wake_up_interruptible(&port->state->port.delta_msr_wait);
935 static irqreturn_t msm_uart_irq(int irq, void *dev_id)
937 struct uart_port *port = dev_id;
938 struct msm_port *msm_port = UART_TO_MSM(port);
939 struct msm_dma *dma = &msm_port->rx_dma;
944 spin_lock_irqsave(&port->lock, flags);
945 misr = msm_read(port, UART_MISR);
946 msm_write(port, 0, UART_IMR); /* disable interrupt */
948 if (misr & UART_IMR_RXBREAK_START) {
949 msm_port->break_detected = true;
950 msm_write(port, UART_CR_CMD_RESET_RXBREAK_START, UART_CR);
953 if (misr & (UART_IMR_RXLEV | UART_IMR_RXSTALE)) {
955 val = UART_CR_CMD_STALE_EVENT_DISABLE;
956 msm_write(port, val, UART_CR);
957 val = UART_CR_CMD_RESET_STALE_INT;
958 msm_write(port, val, UART_CR);
960 * Flush DMA input fifo to memory, this will also
961 * trigger DMA RX completion
963 dmaengine_terminate_all(dma->chan);
964 } else if (msm_port->is_uartdm) {
965 msm_handle_rx_dm(port, misr);
970 if (misr & UART_IMR_TXLEV)
972 if (misr & UART_IMR_DELTA_CTS)
973 msm_handle_delta_cts(port);
975 msm_write(port, msm_port->imr, UART_IMR); /* restore interrupt */
976 spin_unlock_irqrestore(&port->lock, flags);
981 static unsigned int msm_tx_empty(struct uart_port *port)
983 return (msm_read(port, UART_SR) & UART_SR_TX_EMPTY) ? TIOCSER_TEMT : 0;
986 static unsigned int msm_get_mctrl(struct uart_port *port)
988 return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR | TIOCM_RTS;
991 static void msm_reset(struct uart_port *port)
993 struct msm_port *msm_port = UART_TO_MSM(port);
996 /* reset everything */
997 msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
998 msm_write(port, UART_CR_CMD_RESET_TX, UART_CR);
999 msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
1000 msm_write(port, UART_CR_CMD_RESET_BREAK_INT, UART_CR);
1001 msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
1002 msm_write(port, UART_CR_CMD_RESET_RFR, UART_CR);
1003 mr = msm_read(port, UART_MR1);
1004 mr &= ~UART_MR1_RX_RDY_CTL;
1005 msm_write(port, mr, UART_MR1);
1007 /* Disable DM modes */
1008 if (msm_port->is_uartdm)
1009 msm_write(port, 0, UARTDM_DMEN);
1012 static void msm_set_mctrl(struct uart_port *port, unsigned int mctrl)
1016 mr = msm_read(port, UART_MR1);
1018 if (!(mctrl & TIOCM_RTS)) {
1019 mr &= ~UART_MR1_RX_RDY_CTL;
1020 msm_write(port, mr, UART_MR1);
1021 msm_write(port, UART_CR_CMD_RESET_RFR, UART_CR);
1023 mr |= UART_MR1_RX_RDY_CTL;
1024 msm_write(port, mr, UART_MR1);
1028 static void msm_break_ctl(struct uart_port *port, int break_ctl)
1031 msm_write(port, UART_CR_CMD_START_BREAK, UART_CR);
1033 msm_write(port, UART_CR_CMD_STOP_BREAK, UART_CR);
1036 struct msm_baud_map {
1042 static const struct msm_baud_map *
1043 msm_find_best_baud(struct uart_port *port, unsigned int baud,
1044 unsigned long *rate)
1046 struct msm_port *msm_port = UART_TO_MSM(port);
1047 unsigned int divisor, result;
1048 unsigned long target, old, best_rate = 0, diff, best_diff = ULONG_MAX;
1049 const struct msm_baud_map *entry, *end, *best;
1050 static const struct msm_baud_map table[] = {
1069 best = table; /* Default to smallest divider */
1070 target = clk_round_rate(msm_port->clk, 16 * baud);
1071 divisor = DIV_ROUND_CLOSEST(target, 16 * baud);
1073 end = table + ARRAY_SIZE(table);
1075 while (entry < end) {
1076 if (entry->divisor <= divisor) {
1077 result = target / entry->divisor / 16;
1078 diff = abs(result - baud);
1080 /* Keep track of best entry */
1081 if (diff < best_diff) {
1089 } else if (entry->divisor > divisor) {
1091 target = clk_round_rate(msm_port->clk, old + 1);
1093 * The rate didn't get any faster so we can't do
1094 * better at dividing it down
1099 /* Start the divisor search over at this new rate */
1101 divisor = DIV_ROUND_CLOSEST(target, 16 * baud);
1111 static int msm_set_baud_rate(struct uart_port *port, unsigned int baud,
1112 unsigned long *saved_flags)
1114 unsigned int rxstale, watermark, mask;
1115 struct msm_port *msm_port = UART_TO_MSM(port);
1116 const struct msm_baud_map *entry;
1117 unsigned long flags, rate;
1119 flags = *saved_flags;
1120 spin_unlock_irqrestore(&port->lock, flags);
1122 entry = msm_find_best_baud(port, baud, &rate);
1123 clk_set_rate(msm_port->clk, rate);
1124 baud = rate / 16 / entry->divisor;
1126 spin_lock_irqsave(&port->lock, flags);
1127 *saved_flags = flags;
1128 port->uartclk = rate;
1130 msm_write(port, entry->code, UART_CSR);
1132 /* RX stale watermark */
1133 rxstale = entry->rxstale;
1134 watermark = UART_IPR_STALE_LSB & rxstale;
1135 if (msm_port->is_uartdm) {
1136 mask = UART_DM_IPR_STALE_TIMEOUT_MSB;
1138 watermark |= UART_IPR_RXSTALE_LAST;
1139 mask = UART_IPR_STALE_TIMEOUT_MSB;
1142 watermark |= mask & (rxstale << 2);
1144 msm_write(port, watermark, UART_IPR);
1146 /* set RX watermark */
1147 watermark = (port->fifosize * 3) / 4;
1148 msm_write(port, watermark, UART_RFWR);
1150 /* set TX watermark */
1151 msm_write(port, 10, UART_TFWR);
1153 msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
1156 /* Enable RX and TX */
1157 msm_write(port, UART_CR_TX_ENABLE | UART_CR_RX_ENABLE, UART_CR);
1159 /* turn on RX and CTS interrupts */
1160 msm_port->imr = UART_IMR_RXLEV | UART_IMR_RXSTALE |
1161 UART_IMR_CURRENT_CTS | UART_IMR_RXBREAK_START;
1163 msm_write(port, msm_port->imr, UART_IMR);
1165 if (msm_port->is_uartdm) {
1166 msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
1167 msm_write(port, 0xFFFFFF, UARTDM_DMRX);
1168 msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
1174 static void msm_init_clock(struct uart_port *port)
1176 struct msm_port *msm_port = UART_TO_MSM(port);
1178 clk_prepare_enable(msm_port->clk);
1179 clk_prepare_enable(msm_port->pclk);
1180 msm_serial_set_mnd_regs(port);
1183 static int msm_startup(struct uart_port *port)
1185 struct msm_port *msm_port = UART_TO_MSM(port);
1186 unsigned int data, rfr_level, mask;
1189 snprintf(msm_port->name, sizeof(msm_port->name),
1190 "msm_serial%d", port->line);
1192 msm_init_clock(port);
1194 if (likely(port->fifosize > 12))
1195 rfr_level = port->fifosize - 12;
1197 rfr_level = port->fifosize;
1199 /* set automatic RFR level */
1200 data = msm_read(port, UART_MR1);
1202 if (msm_port->is_uartdm)
1203 mask = UART_DM_MR1_AUTO_RFR_LEVEL1;
1205 mask = UART_MR1_AUTO_RFR_LEVEL1;
1208 data &= ~UART_MR1_AUTO_RFR_LEVEL0;
1209 data |= mask & (rfr_level << 2);
1210 data |= UART_MR1_AUTO_RFR_LEVEL0 & rfr_level;
1211 msm_write(port, data, UART_MR1);
1213 if (msm_port->is_uartdm) {
1214 msm_request_tx_dma(msm_port, msm_port->uart.mapbase);
1215 msm_request_rx_dma(msm_port, msm_port->uart.mapbase);
1218 ret = request_irq(port->irq, msm_uart_irq, IRQF_TRIGGER_HIGH,
1219 msm_port->name, port);
1226 if (msm_port->is_uartdm)
1227 msm_release_dma(msm_port);
1229 clk_disable_unprepare(msm_port->pclk);
1230 clk_disable_unprepare(msm_port->clk);
1235 static void msm_shutdown(struct uart_port *port)
1237 struct msm_port *msm_port = UART_TO_MSM(port);
1240 msm_write(port, 0, UART_IMR); /* disable interrupts */
1242 if (msm_port->is_uartdm)
1243 msm_release_dma(msm_port);
1245 clk_disable_unprepare(msm_port->clk);
1247 free_irq(port->irq, port);
1250 static void msm_set_termios(struct uart_port *port, struct ktermios *termios,
1251 struct ktermios *old)
1253 struct msm_port *msm_port = UART_TO_MSM(port);
1254 struct msm_dma *dma = &msm_port->rx_dma;
1255 unsigned long flags;
1256 unsigned int baud, mr;
1258 spin_lock_irqsave(&port->lock, flags);
1260 if (dma->chan) /* Terminate if any */
1261 msm_stop_dma(port, dma);
1263 /* calculate and set baud rate */
1264 baud = uart_get_baud_rate(port, termios, old, 300, 4000000);
1265 baud = msm_set_baud_rate(port, baud, &flags);
1266 if (tty_termios_baud_rate(termios))
1267 tty_termios_encode_baud_rate(termios, baud, baud);
1269 /* calculate parity */
1270 mr = msm_read(port, UART_MR2);
1271 mr &= ~UART_MR2_PARITY_MODE;
1272 if (termios->c_cflag & PARENB) {
1273 if (termios->c_cflag & PARODD)
1274 mr |= UART_MR2_PARITY_MODE_ODD;
1275 else if (termios->c_cflag & CMSPAR)
1276 mr |= UART_MR2_PARITY_MODE_SPACE;
1278 mr |= UART_MR2_PARITY_MODE_EVEN;
1281 /* calculate bits per char */
1282 mr &= ~UART_MR2_BITS_PER_CHAR;
1283 switch (termios->c_cflag & CSIZE) {
1285 mr |= UART_MR2_BITS_PER_CHAR_5;
1288 mr |= UART_MR2_BITS_PER_CHAR_6;
1291 mr |= UART_MR2_BITS_PER_CHAR_7;
1295 mr |= UART_MR2_BITS_PER_CHAR_8;
1299 /* calculate stop bits */
1300 mr &= ~(UART_MR2_STOP_BIT_LEN_ONE | UART_MR2_STOP_BIT_LEN_TWO);
1301 if (termios->c_cflag & CSTOPB)
1302 mr |= UART_MR2_STOP_BIT_LEN_TWO;
1304 mr |= UART_MR2_STOP_BIT_LEN_ONE;
1306 /* set parity, bits per char, and stop bit */
1307 msm_write(port, mr, UART_MR2);
1309 /* calculate and set hardware flow control */
1310 mr = msm_read(port, UART_MR1);
1311 mr &= ~(UART_MR1_CTS_CTL | UART_MR1_RX_RDY_CTL);
1312 if (termios->c_cflag & CRTSCTS) {
1313 mr |= UART_MR1_CTS_CTL;
1314 mr |= UART_MR1_RX_RDY_CTL;
1316 msm_write(port, mr, UART_MR1);
1318 /* Configure status bits to ignore based on termio flags. */
1319 port->read_status_mask = 0;
1320 if (termios->c_iflag & INPCK)
1321 port->read_status_mask |= UART_SR_PAR_FRAME_ERR;
1322 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
1323 port->read_status_mask |= UART_SR_RX_BREAK;
1325 uart_update_timeout(port, termios->c_cflag, baud);
1327 /* Try to use DMA */
1328 msm_start_rx_dma(msm_port);
1330 spin_unlock_irqrestore(&port->lock, flags);
1333 static const char *msm_type(struct uart_port *port)
1338 static void msm_release_port(struct uart_port *port)
1340 struct platform_device *pdev = to_platform_device(port->dev);
1341 struct resource *uart_resource;
1342 resource_size_t size;
1344 uart_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1345 if (unlikely(!uart_resource))
1347 size = resource_size(uart_resource);
1349 release_mem_region(port->mapbase, size);
1350 iounmap(port->membase);
1351 port->membase = NULL;
1354 static int msm_request_port(struct uart_port *port)
1356 struct platform_device *pdev = to_platform_device(port->dev);
1357 struct resource *uart_resource;
1358 resource_size_t size;
1361 uart_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1362 if (unlikely(!uart_resource))
1365 size = resource_size(uart_resource);
1367 if (!request_mem_region(port->mapbase, size, "msm_serial"))
1370 port->membase = ioremap(port->mapbase, size);
1371 if (!port->membase) {
1373 goto fail_release_port;
1379 release_mem_region(port->mapbase, size);
1383 static void msm_config_port(struct uart_port *port, int flags)
1387 if (flags & UART_CONFIG_TYPE) {
1388 port->type = PORT_MSM;
1389 ret = msm_request_port(port);
1395 static int msm_verify_port(struct uart_port *port, struct serial_struct *ser)
1397 if (unlikely(ser->type != PORT_UNKNOWN && ser->type != PORT_MSM))
1399 if (unlikely(port->irq != ser->irq))
1404 static void msm_power(struct uart_port *port, unsigned int state,
1405 unsigned int oldstate)
1407 struct msm_port *msm_port = UART_TO_MSM(port);
1411 clk_prepare_enable(msm_port->clk);
1412 clk_prepare_enable(msm_port->pclk);
1415 clk_disable_unprepare(msm_port->clk);
1416 clk_disable_unprepare(msm_port->pclk);
1419 pr_err("msm_serial: Unknown PM state %d\n", state);
1423 #ifdef CONFIG_CONSOLE_POLL
1424 static int msm_poll_get_char_single(struct uart_port *port)
1426 struct msm_port *msm_port = UART_TO_MSM(port);
1427 unsigned int rf_reg = msm_port->is_uartdm ? UARTDM_RF : UART_RF;
1429 if (!(msm_read(port, UART_SR) & UART_SR_RX_READY))
1430 return NO_POLL_CHAR;
1432 return msm_read(port, rf_reg) & 0xff;
1435 static int msm_poll_get_char_dm(struct uart_port *port)
1440 unsigned char *sp = (unsigned char *)&slop;
1442 /* Check if a previous read had more than one char */
1444 c = sp[sizeof(slop) - count];
1446 /* Or if FIFO is empty */
1447 } else if (!(msm_read(port, UART_SR) & UART_SR_RX_READY)) {
1449 * If RX packing buffer has less than a word, force stale to
1450 * push contents into RX FIFO
1452 count = msm_read(port, UARTDM_RXFS);
1453 count = (count >> UARTDM_RXFS_BUF_SHIFT) & UARTDM_RXFS_BUF_MASK;
1455 msm_write(port, UART_CR_CMD_FORCE_STALE, UART_CR);
1456 slop = msm_read(port, UARTDM_RF);
1459 msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
1460 msm_write(port, 0xFFFFFF, UARTDM_DMRX);
1461 msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE,
1466 /* FIFO has a word */
1468 slop = msm_read(port, UARTDM_RF);
1470 count = sizeof(slop) - 1;
1476 static int msm_poll_get_char(struct uart_port *port)
1480 struct msm_port *msm_port = UART_TO_MSM(port);
1482 /* Disable all interrupts */
1483 imr = msm_read(port, UART_IMR);
1484 msm_write(port, 0, UART_IMR);
1486 if (msm_port->is_uartdm)
1487 c = msm_poll_get_char_dm(port);
1489 c = msm_poll_get_char_single(port);
1491 /* Enable interrupts */
1492 msm_write(port, imr, UART_IMR);
1497 static void msm_poll_put_char(struct uart_port *port, unsigned char c)
1500 struct msm_port *msm_port = UART_TO_MSM(port);
1502 /* Disable all interrupts */
1503 imr = msm_read(port, UART_IMR);
1504 msm_write(port, 0, UART_IMR);
1506 if (msm_port->is_uartdm)
1507 msm_reset_dm_count(port, 1);
1509 /* Wait until FIFO is empty */
1510 while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
1513 /* Write a character */
1514 msm_write(port, c, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
1516 /* Wait until FIFO is empty */
1517 while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
1520 /* Enable interrupts */
1521 msm_write(port, imr, UART_IMR);
1525 static struct uart_ops msm_uart_pops = {
1526 .tx_empty = msm_tx_empty,
1527 .set_mctrl = msm_set_mctrl,
1528 .get_mctrl = msm_get_mctrl,
1529 .stop_tx = msm_stop_tx,
1530 .start_tx = msm_start_tx,
1531 .stop_rx = msm_stop_rx,
1532 .enable_ms = msm_enable_ms,
1533 .break_ctl = msm_break_ctl,
1534 .startup = msm_startup,
1535 .shutdown = msm_shutdown,
1536 .set_termios = msm_set_termios,
1538 .release_port = msm_release_port,
1539 .request_port = msm_request_port,
1540 .config_port = msm_config_port,
1541 .verify_port = msm_verify_port,
1543 #ifdef CONFIG_CONSOLE_POLL
1544 .poll_get_char = msm_poll_get_char,
1545 .poll_put_char = msm_poll_put_char,
1549 static struct msm_port msm_uart_ports[] = {
1553 .ops = &msm_uart_pops,
1554 .flags = UPF_BOOT_AUTOCONF,
1562 .ops = &msm_uart_pops,
1563 .flags = UPF_BOOT_AUTOCONF,
1571 .ops = &msm_uart_pops,
1572 .flags = UPF_BOOT_AUTOCONF,
1579 #define UART_NR ARRAY_SIZE(msm_uart_ports)
1581 static inline struct uart_port *msm_get_port_from_line(unsigned int line)
1583 return &msm_uart_ports[line].uart;
1586 #ifdef CONFIG_SERIAL_MSM_CONSOLE
1587 static void __msm_console_write(struct uart_port *port, const char *s,
1588 unsigned int count, bool is_uartdm)
1590 unsigned long flags;
1592 int num_newlines = 0;
1593 bool replaced = false;
1598 tf = port->membase + UARTDM_TF;
1600 tf = port->membase + UART_TF;
1602 /* Account for newlines that will get a carriage return added */
1603 for (i = 0; i < count; i++)
1606 count += num_newlines;
1608 local_irq_save(flags);
1612 else if (oops_in_progress)
1613 locked = spin_trylock(&port->lock);
1615 spin_lock(&port->lock);
1618 msm_reset_dm_count(port, count);
1623 unsigned int num_chars;
1624 char buf[4] = { 0 };
1627 num_chars = min(count - i, (unsigned int)sizeof(buf));
1631 for (j = 0; j < num_chars; j++) {
1634 if (c == '\n' && !replaced) {
1639 if (j < num_chars) {
1646 while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
1649 iowrite32_rep(tf, buf, 1);
1654 spin_unlock(&port->lock);
1656 local_irq_restore(flags);
1659 static void msm_console_write(struct console *co, const char *s,
1662 struct uart_port *port;
1663 struct msm_port *msm_port;
1665 BUG_ON(co->index < 0 || co->index >= UART_NR);
1667 port = msm_get_port_from_line(co->index);
1668 msm_port = UART_TO_MSM(port);
1670 __msm_console_write(port, s, count, msm_port->is_uartdm);
1673 static int __init msm_console_setup(struct console *co, char *options)
1675 struct uart_port *port;
1681 if (unlikely(co->index >= UART_NR || co->index < 0))
1684 port = msm_get_port_from_line(co->index);
1686 if (unlikely(!port->membase))
1689 msm_init_clock(port);
1692 uart_parse_options(options, &baud, &parity, &bits, &flow);
1694 pr_info("msm_serial: console setup on port #%d\n", port->line);
1696 return uart_set_options(port, co, baud, parity, bits, flow);
1700 msm_serial_early_write(struct console *con, const char *s, unsigned n)
1702 struct earlycon_device *dev = con->data;
1704 __msm_console_write(&dev->port, s, n, false);
1708 msm_serial_early_console_setup(struct earlycon_device *device, const char *opt)
1710 if (!device->port.membase)
1713 device->con->write = msm_serial_early_write;
1716 OF_EARLYCON_DECLARE(msm_serial, "qcom,msm-uart",
1717 msm_serial_early_console_setup);
1720 msm_serial_early_write_dm(struct console *con, const char *s, unsigned n)
1722 struct earlycon_device *dev = con->data;
1724 __msm_console_write(&dev->port, s, n, true);
1728 msm_serial_early_console_setup_dm(struct earlycon_device *device,
1731 if (!device->port.membase)
1734 device->con->write = msm_serial_early_write_dm;
1737 OF_EARLYCON_DECLARE(msm_serial_dm, "qcom,msm-uartdm",
1738 msm_serial_early_console_setup_dm);
1740 static struct uart_driver msm_uart_driver;
1742 static struct console msm_console = {
1744 .write = msm_console_write,
1745 .device = uart_console_device,
1746 .setup = msm_console_setup,
1747 .flags = CON_PRINTBUFFER,
1749 .data = &msm_uart_driver,
1752 #define MSM_CONSOLE (&msm_console)
1755 #define MSM_CONSOLE NULL
1758 static struct uart_driver msm_uart_driver = {
1759 .owner = THIS_MODULE,
1760 .driver_name = "msm_serial",
1761 .dev_name = "ttyMSM",
1763 .cons = MSM_CONSOLE,
1766 static atomic_t msm_uart_next_id = ATOMIC_INIT(0);
1768 static const struct of_device_id msm_uartdm_table[] = {
1769 { .compatible = "qcom,msm-uartdm-v1.1", .data = (void *)UARTDM_1P1 },
1770 { .compatible = "qcom,msm-uartdm-v1.2", .data = (void *)UARTDM_1P2 },
1771 { .compatible = "qcom,msm-uartdm-v1.3", .data = (void *)UARTDM_1P3 },
1772 { .compatible = "qcom,msm-uartdm-v1.4", .data = (void *)UARTDM_1P4 },
1776 static int msm_serial_probe(struct platform_device *pdev)
1778 struct msm_port *msm_port;
1779 struct resource *resource;
1780 struct uart_port *port;
1781 const struct of_device_id *id;
1784 if (pdev->dev.of_node)
1785 line = of_alias_get_id(pdev->dev.of_node, "serial");
1790 line = atomic_inc_return(&msm_uart_next_id) - 1;
1792 if (unlikely(line < 0 || line >= UART_NR))
1795 dev_info(&pdev->dev, "msm_serial: detected port #%d\n", line);
1797 port = msm_get_port_from_line(line);
1798 port->dev = &pdev->dev;
1799 msm_port = UART_TO_MSM(port);
1801 id = of_match_device(msm_uartdm_table, &pdev->dev);
1803 msm_port->is_uartdm = (unsigned long)id->data;
1805 msm_port->is_uartdm = 0;
1807 msm_port->clk = devm_clk_get(&pdev->dev, "core");
1808 if (IS_ERR(msm_port->clk))
1809 return PTR_ERR(msm_port->clk);
1811 if (msm_port->is_uartdm) {
1812 msm_port->pclk = devm_clk_get(&pdev->dev, "iface");
1813 if (IS_ERR(msm_port->pclk))
1814 return PTR_ERR(msm_port->pclk);
1817 port->uartclk = clk_get_rate(msm_port->clk);
1818 dev_info(&pdev->dev, "uartclk = %d\n", port->uartclk);
1820 resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1821 if (unlikely(!resource))
1823 port->mapbase = resource->start;
1825 irq = platform_get_irq(pdev, 0);
1826 if (unlikely(irq < 0))
1830 platform_set_drvdata(pdev, port);
1832 return uart_add_one_port(&msm_uart_driver, port);
1835 static int msm_serial_remove(struct platform_device *pdev)
1837 struct uart_port *port = platform_get_drvdata(pdev);
1839 uart_remove_one_port(&msm_uart_driver, port);
1844 static const struct of_device_id msm_match_table[] = {
1845 { .compatible = "qcom,msm-uart" },
1846 { .compatible = "qcom,msm-uartdm" },
1849 MODULE_DEVICE_TABLE(of, msm_match_table);
1851 static struct platform_driver msm_platform_driver = {
1852 .remove = msm_serial_remove,
1853 .probe = msm_serial_probe,
1855 .name = "msm_serial",
1856 .of_match_table = msm_match_table,
1860 static int __init msm_serial_init(void)
1864 ret = uart_register_driver(&msm_uart_driver);
1868 ret = platform_driver_register(&msm_platform_driver);
1870 uart_unregister_driver(&msm_uart_driver);
1872 pr_info("msm_serial: driver initialized\n");
1877 static void __exit msm_serial_exit(void)
1879 platform_driver_unregister(&msm_platform_driver);
1880 uart_unregister_driver(&msm_uart_driver);
1883 module_init(msm_serial_init);
1884 module_exit(msm_serial_exit);
1886 MODULE_AUTHOR("Robert Love <rlove@google.com>");
1887 MODULE_DESCRIPTION("Driver for msm7x serial device");
1888 MODULE_LICENSE("GPL");