~hc/RK356X_SDK_RELEASE.git

..	..	@@ -10,31 +10,335 @@
10	10	#include <linux/module.h>
11	11	#include <linux/of_irq.h>
12	12	#include <linux/of_platform.h>
	13	+#include <linux/pinctrl/consumer.h>
13	14	#include <linux/platform_device.h>
14	15	#include <linux/pm_runtime.h>
15	16	#include <linux/serial_8250.h>
16	17	#include <linux/serial_reg.h>
	18	+#include <linux/console.h>
	19	+#include <linux/dma-mapping.h>
	20	+#include <linux/tty.h>
	21	+#include <linux/tty_flip.h>
17	22
18	23	#include "8250.h"
19	24
20		-#define UART_MTK_HIGHS 0x09 /* Highspeed register */
21		-#define UART_MTK_SAMPLE_COUNT 0x0a /* Sample count register */
22		-#define UART_MTK_SAMPLE_POINT 0x0b /* Sample point register */
	25	+#define MTK_UART_HIGHS 0x09 /* Highspeed register */
	26	+#define MTK_UART_SAMPLE_COUNT 0x0a /* Sample count register */
	27	+#define MTK_UART_SAMPLE_POINT 0x0b /* Sample point register */
23	28	#define MTK_UART_RATE_FIX 0x0d /* UART Rate Fix Register */
	29	+#define MTK_UART_ESCAPE_DAT 0x10 /* Escape Character register */
	30	+#define MTK_UART_ESCAPE_EN 0x11 /* Escape Enable register */
	31	+#define MTK_UART_DMA_EN 0x13 /* DMA Enable register */
	32	+#define MTK_UART_RXTRI_AD 0x14 /* RX Trigger address */
	33	+#define MTK_UART_FRACDIV_L 0x15 /* Fractional divider LSB address */
	34	+#define MTK_UART_FRACDIV_M 0x16 /* Fractional divider MSB address */
	35	+#define MTK_UART_DEBUG0 0x18
	36	+#define MTK_UART_IER_XOFFI 0x20 /* Enable XOFF character interrupt */
	37	+#define MTK_UART_IER_RTSI 0x40 /* Enable RTS Modem status interrupt */
	38	+#define MTK_UART_IER_CTSI 0x80 /* Enable CTS Modem status interrupt */
	39	+
	40	+#define MTK_UART_EFR 38 /* I/O: Extended Features Register */
	41	+#define MTK_UART_EFR_EN 0x10 /* Enable enhancement feature */
	42	+#define MTK_UART_EFR_RTS 0x40 /* Enable hardware rx flow control */
	43	+#define MTK_UART_EFR_CTS 0x80 /* Enable hardware tx flow control */
	44	+#define MTK_UART_EFR_NO_SW_FC 0x0 /* no sw flow control */
	45	+#define MTK_UART_EFR_XON1_XOFF1 0xa /* XON1/XOFF1 as sw flow control */
	46	+#define MTK_UART_EFR_XON2_XOFF2 0x5 /* XON2/XOFF2 as sw flow control */
	47	+#define MTK_UART_EFR_SW_FC_MASK 0xf /* Enable CTS Modem status interrupt */
	48	+#define MTK_UART_EFR_HW_FC (MTK_UART_EFR_RTS \| MTK_UART_EFR_CTS)
	49	+#define MTK_UART_DMA_EN_TX 0x2
	50	+#define MTK_UART_DMA_EN_RX 0x5
	51	+
	52	+#define MTK_UART_ESCAPE_CHAR 0x77 /* Escape char added under sw fc */
	53	+#define MTK_UART_RX_SIZE 0x8000
	54	+#define MTK_UART_TX_TRIGGER 1
	55	+#define MTK_UART_RX_TRIGGER MTK_UART_RX_SIZE
	56	+
	57	+#define MTK_UART_XON1 40 /* I/O: Xon character 1 */
	58	+#define MTK_UART_XOFF1 42 /* I/O: Xoff character 1 */
	59	+
	60	+#ifdef CONFIG_SERIAL_8250_DMA
	61	+enum dma_rx_status {
	62	+ DMA_RX_START = 0,
	63	+ DMA_RX_RUNNING = 1,
	64	+ DMA_RX_SHUTDOWN = 2,
	65	+};
	66	+#endif
24	67
25	68	struct mtk8250_data {
26	69	int line;
	70	+ unsigned int rx_pos;
	71	+ unsigned int clk_count;
27	72	struct clk *uart_clk;
28	73	struct clk *bus_clk;
	74	+ struct uart_8250_dma *dma;
	75	+#ifdef CONFIG_SERIAL_8250_DMA
	76	+ enum dma_rx_status rx_status;
	77	+#endif
	78	+ int rx_wakeup_irq;
29	79	};
	80	+
	81	+/* flow control mode */
	82	+enum {
	83	+ MTK_UART_FC_NONE,
	84	+ MTK_UART_FC_SW,
	85	+ MTK_UART_FC_HW,
	86	+};
	87	+
	88	+#ifdef CONFIG_SERIAL_8250_DMA
	89	+static void mtk8250_rx_dma(struct uart_8250_port *up);
	90	+
	91	+static void mtk8250_dma_rx_complete(void *param)
	92	+{
	93	+ struct uart_8250_port *up = param;
	94	+ struct uart_8250_dma *dma = up->dma;
	95	+ struct mtk8250_data *data = up->port.private_data;
	96	+ struct tty_port *tty_port = &up->port.state->port;
	97	+ struct dma_tx_state state;
	98	+ int copied, total, cnt;
	99	+ unsigned char *ptr;
	100	+ unsigned long flags;
	101	+
	102	+ if (data->rx_status == DMA_RX_SHUTDOWN)
	103	+ return;
	104	+
	105	+ spin_lock_irqsave(&up->port.lock, flags);
	106	+
	107	+ dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state);
	108	+ total = dma->rx_size - state.residue;
	109	+ cnt = total;
	110	+
	111	+ if ((data->rx_pos + cnt) > dma->rx_size)
	112	+ cnt = dma->rx_size - data->rx_pos;
	113	+
	114	+ ptr = (unsigned char *)(data->rx_pos + dma->rx_buf);
	115	+ copied = tty_insert_flip_string(tty_port, ptr, cnt);
	116	+ data->rx_pos += cnt;
	117	+
	118	+ if (total > cnt) {
	119	+ ptr = (unsigned char *)(dma->rx_buf);
	120	+ cnt = total - cnt;
	121	+ copied += tty_insert_flip_string(tty_port, ptr, cnt);
	122	+ data->rx_pos = cnt;
	123	+ }
	124	+
	125	+ up->port.icount.rx += copied;
	126	+
	127	+ tty_flip_buffer_push(tty_port);
	128	+
	129	+ mtk8250_rx_dma(up);
	130	+
	131	+ spin_unlock_irqrestore(&up->port.lock, flags);
	132	+}
	133	+
	134	+static void mtk8250_rx_dma(struct uart_8250_port *up)
	135	+{
	136	+ struct uart_8250_dma *dma = up->dma;
	137	+ struct dma_async_tx_descriptor *desc;
	138	+
	139	+ desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr,
	140	+ dma->rx_size, DMA_DEV_TO_MEM,
	141	+ DMA_PREP_INTERRUPT \| DMA_CTRL_ACK);
	142	+ if (!desc) {
	143	+ pr_err("failed to prepare rx slave single\n");
	144	+ return;
	145	+ }
	146	+
	147	+ desc->callback = mtk8250_dma_rx_complete;
	148	+ desc->callback_param = up;
	149	+
	150	+ dma->rx_cookie = dmaengine_submit(desc);
	151	+
	152	+ dma_async_issue_pending(dma->rxchan);
	153	+}
	154	+
	155	+static void mtk8250_dma_enable(struct uart_8250_port *up)
	156	+{
	157	+ struct uart_8250_dma *dma = up->dma;
	158	+ struct mtk8250_data *data = up->port.private_data;
	159	+ int lcr = serial_in(up, UART_LCR);
	160	+
	161	+ if (data->rx_status != DMA_RX_START)
	162	+ return;
	163	+
	164	+ dma->rxconf.src_port_window_size = dma->rx_size;
	165	+ dma->rxconf.src_addr = dma->rx_addr;
	166	+
	167	+ dma->txconf.dst_port_window_size = UART_XMIT_SIZE;
	168	+ dma->txconf.dst_addr = dma->tx_addr;
	169	+
	170	+ serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO \| UART_FCR_CLEAR_RCVR \|
	171	+ UART_FCR_CLEAR_XMIT);
	172	+ serial_out(up, MTK_UART_DMA_EN,
	173	+ MTK_UART_DMA_EN_RX \| MTK_UART_DMA_EN_TX);
	174	+
	175	+ serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
	176	+ serial_out(up, MTK_UART_EFR, UART_EFR_ECB);
	177	+ serial_out(up, UART_LCR, lcr);
	178	+
	179	+ if (dmaengine_slave_config(dma->rxchan, &dma->rxconf) != 0)
	180	+ pr_err("failed to configure rx dma channel\n");
	181	+ if (dmaengine_slave_config(dma->txchan, &dma->txconf) != 0)
	182	+ pr_err("failed to configure tx dma channel\n");
	183	+
	184	+ data->rx_status = DMA_RX_RUNNING;
	185	+ data->rx_pos = 0;
	186	+ mtk8250_rx_dma(up);
	187	+}
	188	+#endif
	189	+
	190	+static int mtk8250_startup(struct uart_port *port)
	191	+{
	192	+#ifdef CONFIG_SERIAL_8250_DMA
	193	+ struct uart_8250_port *up = up_to_u8250p(port);
	194	+ struct mtk8250_data *data = port->private_data;
	195	+
	196	+ /* disable DMA for console */
	197	+ if (uart_console(port))
	198	+ up->dma = NULL;
	199	+
	200	+ if (up->dma) {
	201	+ data->rx_status = DMA_RX_START;
	202	+ uart_circ_clear(&port->state->xmit);
	203	+ }
	204	+#endif
	205	+ memset(&port->icount, 0, sizeof(port->icount));
	206	+
	207	+ return serial8250_do_startup(port);
	208	+}
	209	+
	210	+static void mtk8250_shutdown(struct uart_port *port)
	211	+{
	212	+#ifdef CONFIG_SERIAL_8250_DMA
	213	+ struct uart_8250_port *up = up_to_u8250p(port);
	214	+ struct mtk8250_data *data = port->private_data;
	215	+
	216	+ if (up->dma)
	217	+ data->rx_status = DMA_RX_SHUTDOWN;
	218	+#endif
	219	+
	220	+ return serial8250_do_shutdown(port);
	221	+}
	222	+
	223	+static void mtk8250_disable_intrs(struct uart_8250_port *up, int mask)
	224	+{
	225	+ struct uart_port *port = &up->port;
	226	+ unsigned int flags;
	227	+ unsigned int ier;
	228	+ bool is_console;
	229	+
	230	+ is_console = uart_console(port);
	231	+
	232	+ if (is_console)
	233	+ console_atomic_lock(&flags);
	234	+
	235	+ ier = serial_in(up, UART_IER);
	236	+ serial_out(up, UART_IER, ier & (~mask));
	237	+
	238	+ if (is_console)
	239	+ console_atomic_unlock(flags);
	240	+}
	241	+
	242	+static void mtk8250_enable_intrs(struct uart_8250_port *up, int mask)
	243	+{
	244	+ struct uart_port *port = &up->port;
	245	+ unsigned int flags;
	246	+ unsigned int ier;
	247	+
	248	+ if (uart_console(port))
	249	+ console_atomic_lock(&flags);
	250	+
	251	+ ier = serial_in(up, UART_IER);
	252	+ serial_out(up, UART_IER, ier \| mask);
	253	+
	254	+ if (uart_console(port))
	255	+ console_atomic_unlock(flags);
	256	+}
	257	+
	258	+static void mtk8250_set_flow_ctrl(struct uart_8250_port *up, int mode)
	259	+{
	260	+ struct uart_port *port = &up->port;
	261	+ int lcr = serial_in(up, UART_LCR);
	262	+
	263	+ serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
	264	+ serial_out(up, MTK_UART_EFR, UART_EFR_ECB);
	265	+ serial_out(up, UART_LCR, lcr);
	266	+ lcr = serial_in(up, UART_LCR);
	267	+
	268	+ switch (mode) {
	269	+ case MTK_UART_FC_NONE:
	270	+ serial_out(up, MTK_UART_ESCAPE_DAT, MTK_UART_ESCAPE_CHAR);
	271	+ serial_out(up, MTK_UART_ESCAPE_EN, 0x00);
	272	+ serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
	273	+ serial_out(up, MTK_UART_EFR, serial_in(up, MTK_UART_EFR) &
	274	+ (~(MTK_UART_EFR_HW_FC \| MTK_UART_EFR_SW_FC_MASK)));
	275	+ serial_out(up, UART_LCR, lcr);
	276	+ mtk8250_disable_intrs(up, MTK_UART_IER_XOFFI \|
	277	+ MTK_UART_IER_RTSI \| MTK_UART_IER_CTSI);
	278	+ break;
	279	+
	280	+ case MTK_UART_FC_HW:
	281	+ serial_out(up, MTK_UART_ESCAPE_DAT, MTK_UART_ESCAPE_CHAR);
	282	+ serial_out(up, MTK_UART_ESCAPE_EN, 0x00);
	283	+ serial_out(up, UART_MCR, UART_MCR_RTS);
	284	+ serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
	285	+
	286	+ /enable hw flow control/
	287	+ serial_out(up, MTK_UART_EFR, MTK_UART_EFR_HW_FC \|
	288	+ (serial_in(up, MTK_UART_EFR) &
	289	+ (~(MTK_UART_EFR_HW_FC \| MTK_UART_EFR_SW_FC_MASK))));
	290	+
	291	+ serial_out(up, UART_LCR, lcr);
	292	+ mtk8250_disable_intrs(up, MTK_UART_IER_XOFFI);
	293	+ mtk8250_enable_intrs(up, MTK_UART_IER_CTSI \| MTK_UART_IER_RTSI);
	294	+ break;
	295	+
	296	+ case MTK_UART_FC_SW: /MTK software flow control /
	297	+ serial_out(up, MTK_UART_ESCAPE_DAT, MTK_UART_ESCAPE_CHAR);
	298	+ serial_out(up, MTK_UART_ESCAPE_EN, 0x01);
	299	+ serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
	300	+
	301	+ /enable sw flow control /
	302	+ serial_out(up, MTK_UART_EFR, MTK_UART_EFR_XON1_XOFF1 \|
	303	+ (serial_in(up, MTK_UART_EFR) &
	304	+ (~(MTK_UART_EFR_HW_FC \| MTK_UART_EFR_SW_FC_MASK))));
	305	+
	306	+ serial_out(up, MTK_UART_XON1, START_CHAR(port->state->port.tty));
	307	+ serial_out(up, MTK_UART_XOFF1, STOP_CHAR(port->state->port.tty));
	308	+ serial_out(up, UART_LCR, lcr);
	309	+ mtk8250_disable_intrs(up, MTK_UART_IER_CTSI\|MTK_UART_IER_RTSI);
	310	+ mtk8250_enable_intrs(up, MTK_UART_IER_XOFFI);
	311	+ break;
	312	+ default:
	313	+ break;
	314	+ }
	315	+}
30	316
31	317	static void
32	318	mtk8250_set_termios(struct uart_port port, struct ktermios termios,
33	319	struct ktermios *old)
34	320	{
	321	+ unsigned short fraction_L_mapping[] = {
	322	+ 0, 1, 0x5, 0x15, 0x55, 0x57, 0x57, 0x77, 0x7F, 0xFF, 0xFF
	323	+ };
	324	+ unsigned short fraction_M_mapping[] = {
	325	+ 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 3
	326	+ };
35	327	struct uart_8250_port *up = up_to_u8250p(port);
	328	+ unsigned int baud, quot, fraction;
36	329	unsigned long flags;
37		- unsigned int baud, quot;
	330	+ int mode;
	331	+
	332	+#ifdef CONFIG_SERIAL_8250_DMA
	333	+ if (up->dma) {
	334	+ if (uart_console(port)) {
	335	+ devm_kfree(up->port.dev, up->dma);
	336	+ up->dma = NULL;
	337	+ } else {
	338	+ mtk8250_dma_enable(up);
	339	+ }
	340	+ }
	341	+#endif
38	342
39	343	/*
40	344	* Store the requested baud rate before calling the generic 8250
..	..	@@ -52,7 +356,7 @@
52	356	tty_termios_encode_baud_rate(termios, baud, baud);
53	357
54	358	/*
55		- * Mediatek UARTs use an extra highspeed register (UART_MTK_HIGHS)
	359	+ * Mediatek UARTs use an extra highspeed register (MTK_UART_HIGHS)
56	360	*
57	361	* We need to recalcualte the quot register, as the claculation depends
58	362	* on the vaule in the highspeed register.
..	..	@@ -68,18 +372,11 @@
68	372	port->uartclk / 16 / UART_DIV_MAX,
69	373	port->uartclk);
70	374
71		- if (baud <= 115200) {
72		- serial_port_out(port, UART_MTK_HIGHS, 0x0);
	375	+ if (baud < 115200) {
	376	+ serial_port_out(port, MTK_UART_HIGHS, 0x0);
73	377	quot = uart_get_divisor(port, baud);
74		- } else if (baud <= 576000) {
75		- serial_port_out(port, UART_MTK_HIGHS, 0x2);
76		-
77		- /* Set to next lower baudrate supported */
78		- if ((baud == 500000) \|\| (baud == 576000))
79		- baud = 460800;
80		- quot = DIV_ROUND_UP(port->uartclk, 4 * baud);
81	378	} else {
82		- serial_port_out(port, UART_MTK_HIGHS, 0x3);
	379	+ serial_port_out(port, MTK_UART_HIGHS, 0x3);
83	380	quot = DIV_ROUND_UP(port->uartclk, 256 * baud);
84	381	}
85	382
..	..	@@ -101,17 +398,39 @@
101	398	/* reset DLAB */
102	399	serial_port_out(port, UART_LCR, up->lcr);
103	400
104		- if (baud > 460800) {
	401	+ if (baud >= 115200) {
105	402	unsigned int tmp;
106	403
107		- tmp = DIV_ROUND_CLOSEST(port->uartclk, quot * baud);
108		- serial_port_out(port, UART_MTK_SAMPLE_COUNT, tmp - 1);
109		- serial_port_out(port, UART_MTK_SAMPLE_POINT,
110		- (tmp - 2) >> 1);
	404	+ tmp = (port->uartclk / (baud * quot)) - 1;
	405	+ serial_port_out(port, MTK_UART_SAMPLE_COUNT, tmp);
	406	+ serial_port_out(port, MTK_UART_SAMPLE_POINT,
	407	+ (tmp >> 1) - 1);
	408	+
	409	+ /count fraction to set fractoin register /
	410	+ fraction = ((port->uartclk * 100) / baud / quot) % 100;
	411	+ fraction = DIV_ROUND_CLOSEST(fraction, 10);
	412	+ serial_port_out(port, MTK_UART_FRACDIV_L,
	413	+ fraction_L_mapping[fraction]);
	414	+ serial_port_out(port, MTK_UART_FRACDIV_M,
	415	+ fraction_M_mapping[fraction]);
111	416	} else {
112		- serial_port_out(port, UART_MTK_SAMPLE_COUNT, 0x00);
113		- serial_port_out(port, UART_MTK_SAMPLE_POINT, 0xff);
	417	+ serial_port_out(port, MTK_UART_SAMPLE_COUNT, 0x00);
	418	+ serial_port_out(port, MTK_UART_SAMPLE_POINT, 0xff);
	419	+ serial_port_out(port, MTK_UART_FRACDIV_L, 0x00);
	420	+ serial_port_out(port, MTK_UART_FRACDIV_M, 0x00);
114	421	}
	422	+
	423	+ if ((termios->c_cflag & CRTSCTS) && (!(termios->c_iflag & CRTSCTS)))
	424	+ mode = MTK_UART_FC_HW;
	425	+ else if (termios->c_iflag & CRTSCTS)
	426	+ mode = MTK_UART_FC_SW;
	427	+ else
	428	+ mode = MTK_UART_FC_NONE;
	429	+
	430	+ mtk8250_set_flow_ctrl(up, mode);
	431	+
	432	+ if (uart_console(port))
	433	+ up->port.cons->cflag = termios->c_cflag;
115	434
116	435	spin_unlock_irqrestore(&port->lock, flags);
117	436	/* Don't rewrite B0 */
..	..	@@ -122,9 +441,18 @@
122	441	static int __maybe_unused mtk8250_runtime_suspend(struct device *dev)
123	442	{
124	443	struct mtk8250_data *data = dev_get_drvdata(dev);
	444	+ struct uart_8250_port *up = serial8250_get_port(data->line);
125	445
126		- clk_disable_unprepare(data->uart_clk);
127		- clk_disable_unprepare(data->bus_clk);
	446	+ /* wait until UART in idle status */
	447	+ while
	448	+ (serial_in(up, MTK_UART_DEBUG0));
	449	+
	450	+ if (data->clk_count == 0U) {
	451	+ dev_dbg(dev, "%s clock count is 0\n", __func__);
	452	+ } else {
	453	+ clk_disable_unprepare(data->bus_clk);
	454	+ data->clk_count--;
	455	+ }
128	456
129	457	return 0;
130	458	}
..	..	@@ -134,16 +462,16 @@
134	462	struct mtk8250_data *data = dev_get_drvdata(dev);
135	463	int err;
136	464
137		- err = clk_prepare_enable(data->uart_clk);
138		- if (err) {
139		- dev_warn(dev, "Can't enable clock\n");
140		- return err;
141		- }
142		-
143		- err = clk_prepare_enable(data->bus_clk);
144		- if (err) {
145		- dev_warn(dev, "Can't enable bus clock\n");
146		- return err;
	465	+ if (data->clk_count > 0U) {
	466	+ dev_dbg(dev, "%s clock count is %d\n", __func__,
	467	+ data->clk_count);
	468	+ } else {
	469	+ err = clk_prepare_enable(data->bus_clk);
	470	+ if (err) {
	471	+ dev_warn(dev, "Can't enable bus clock\n");
	472	+ return err;
	473	+ }
	474	+ data->clk_count++;
147	475	}
148	476
149	477	return 0;
..	..	@@ -153,17 +481,30 @@
153	481	mtk8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)
154	482	{
155	483	if (!state)
156		- pm_runtime_get_sync(port->dev);
	484	+ if (!mtk8250_runtime_resume(port->dev))
	485	+ pm_runtime_get_sync(port->dev);
157	486
158	487	serial8250_do_pm(port, state, old);
159	488
160	489	if (state)
161		- pm_runtime_put_sync_suspend(port->dev);
	490	+ if (!pm_runtime_put_sync_suspend(port->dev))
	491	+ mtk8250_runtime_suspend(port->dev);
162	492	}
	493	+
	494	+#ifdef CONFIG_SERIAL_8250_DMA
	495	+static bool mtk8250_dma_filter(struct dma_chan chan, void param)
	496	+{
	497	+ return false;
	498	+}
	499	+#endif
163	500
164	501	static int mtk8250_probe_of(struct platform_device pdev, struct uart_port p,
165	502	struct mtk8250_data *data)
166	503	{
	504	+#ifdef CONFIG_SERIAL_8250_DMA
	505	+ int dmacnt;
	506	+#endif
	507	+
167	508	data->uart_clk = devm_clk_get(&pdev->dev, "baud");
168	509	if (IS_ERR(data->uart_clk)) {
169	510	/*
..	..	@@ -180,19 +521,42 @@
180	521	}
181	522
182	523	data->bus_clk = devm_clk_get(&pdev->dev, "bus");
183		- return PTR_ERR_OR_ZERO(data->bus_clk);
	524	+ if (IS_ERR(data->bus_clk))
	525	+ return PTR_ERR(data->bus_clk);
	526	+
	527	+ data->dma = NULL;
	528	+#ifdef CONFIG_SERIAL_8250_DMA
	529	+ dmacnt = of_property_count_strings(pdev->dev.of_node, "dma-names");
	530	+ if (dmacnt == 2) {
	531	+ data->dma = devm_kzalloc(&pdev->dev, sizeof(*data->dma),
	532	+ GFP_KERNEL);
	533	+ if (!data->dma)
	534	+ return -ENOMEM;
	535	+
	536	+ data->dma->fn = mtk8250_dma_filter;
	537	+ data->dma->rx_size = MTK_UART_RX_SIZE;
	538	+ data->dma->rxconf.src_maxburst = MTK_UART_RX_TRIGGER;
	539	+ data->dma->txconf.dst_maxburst = MTK_UART_TX_TRIGGER;
	540	+ }
	541	+#endif
	542	+
	543	+ return 0;
184	544	}
185	545
186	546	static int mtk8250_probe(struct platform_device *pdev)
187	547	{
188	548	struct uart_8250_port uart = {};
189		- struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
190		- struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
191	549	struct mtk8250_data *data;
192		- int err;
	550	+ struct resource *regs;
	551	+ int irq, err;
193	552
194		- if (!regs \|\| !irq) {
195		- dev_err(&pdev->dev, "no registers/irq defined\n");
	553	+ irq = platform_get_irq(pdev, 0);
	554	+ if (irq < 0)
	555	+ return irq;
	556	+
	557	+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	558	+ if (!regs) {
	559	+ dev_err(&pdev->dev, "no registers defined\n");
196	560	return -EINVAL;
197	561	}
198	562
..	..	@@ -205,6 +569,8 @@
205	569	if (!data)
206	570	return -ENOMEM;
207	571
	572	+ data->clk_count = 0;
	573	+
208	574	if (pdev->dev.of_node) {
209	575	err = mtk8250_probe_of(pdev, &uart.port, data);
210	576	if (err)
..	..	@@ -214,7 +580,7 @@
214	580
215	581	spin_lock_init(&uart.port.lock);
216	582	uart.port.mapbase = regs->start;
217		- uart.port.irq = irq->start;
	583	+ uart.port.irq = irq;
218	584	uart.port.pm = mtk8250_do_pm;
219	585	uart.port.type = PORT_16550;
220	586	uart.port.flags = UPF_BOOT_AUTOCONF \| UPF_FIXED_PORT;
..	..	@@ -222,8 +588,14 @@
222	588	uart.port.iotype = UPIO_MEM32;
223	589	uart.port.regshift = 2;
224	590	uart.port.private_data = data;
	591	+ uart.port.shutdown = mtk8250_shutdown;
	592	+ uart.port.startup = mtk8250_startup;
225	593	uart.port.set_termios = mtk8250_set_termios;
226	594	uart.port.uartclk = clk_get_rate(data->uart_clk);
	595	+#ifdef CONFIG_SERIAL_8250_DMA
	596	+ if (data->dma)
	597	+ uart.dma = data->dma;
	598	+#endif
227	599
228	600	/* Disable Rate Fix function */
229	601	writel(0x0, uart.port.membase +
..	..	@@ -231,18 +603,25 @@
231	603
232	604	platform_set_drvdata(pdev, data);
233	605
	606	+ pm_runtime_enable(&pdev->dev);
234	607	err = mtk8250_runtime_resume(&pdev->dev);
235	608	if (err)
236		- return err;
	609	+ goto err_pm_disable;
237	610
238	611	data->line = serial8250_register_8250_port(&uart);
239		- if (data->line < 0)
240		- return data->line;
	612	+ if (data->line < 0) {
	613	+ err = data->line;
	614	+ goto err_pm_disable;
	615	+ }
241	616
242		- pm_runtime_set_active(&pdev->dev);
243		- pm_runtime_enable(&pdev->dev);
	617	+ data->rx_wakeup_irq = platform_get_irq_optional(pdev, 1);
244	618
245	619	return 0;
	620	+
	621	+err_pm_disable:
	622	+ pm_runtime_disable(&pdev->dev);
	623	+
	624	+ return err;
246	625	}
247	626
248	627	static int mtk8250_remove(struct platform_device *pdev)
..	..	@@ -252,10 +631,12 @@
252	631	pm_runtime_get_sync(&pdev->dev);
253	632
254	633	serial8250_unregister_port(data->line);
255		- mtk8250_runtime_suspend(&pdev->dev);
256	634
257	635	pm_runtime_disable(&pdev->dev);
258	636	pm_runtime_put_noidle(&pdev->dev);
	637	+
	638	+ if (!pm_runtime_status_suspended(&pdev->dev))
	639	+ mtk8250_runtime_suspend(&pdev->dev);
259	640
260	641	return 0;
261	642	}
..	..	@@ -263,8 +644,23 @@
263	644	static int __maybe_unused mtk8250_suspend(struct device *dev)
264	645	{
265	646	struct mtk8250_data *data = dev_get_drvdata(dev);
	647	+ int irq = data->rx_wakeup_irq;
	648	+ int err;
266	649
267	650	serial8250_suspend_port(data->line);
	651	+
	652	+ pinctrl_pm_select_sleep_state(dev);
	653	+ if (irq >= 0) {
	654	+ err = enable_irq_wake(irq);
	655	+ if (err) {
	656	+ dev_err(dev,
	657	+ "failed to enable irq wake on IRQ %d: %d\n",
	658	+ irq, err);
	659	+ pinctrl_pm_select_default_state(dev);
	660	+ serial8250_resume_port(data->line);
	661	+ return err;
	662	+ }
	663	+ }
268	664
269	665	return 0;
270	666	}
..	..	@@ -272,6 +668,11 @@
272	668	static int __maybe_unused mtk8250_resume(struct device *dev)
273	669	{
274	670	struct mtk8250_data *data = dev_get_drvdata(dev);
	671	+ int irq = data->rx_wakeup_irq;
	672	+
	673	+ if (irq >= 0)
	674	+ disable_irq_wake(irq);
	675	+ pinctrl_pm_select_default_state(dev);
275	676
276	677	serial8250_resume_port(data->line);
277	678
..	..	@@ -309,6 +710,7 @@
309	710	return -ENODEV;
310	711
311	712	device->port.iotype = UPIO_MEM32;
	713	+ device->port.regshift = 2;
312	714
313	715	return early_serial8250_setup(device, NULL);
314	716	}