Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Driver for Motorola IMX serial ports |
3 | * | |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Author: Sascha Hauer <sascha@saschahauer.de> | |
7 | * Copyright (C) 2004 Pengutronix | |
8 | * | |
b6e49138 FG |
9 | * Copyright (C) 2009 emlix GmbH |
10 | * Author: Fabian Godehardt (added IrDA support for iMX) | |
11 | * | |
1da177e4 LT |
12 | * This program is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
25 | * | |
26 | * [29-Mar-2005] Mike Lee | |
27 | * Added hardware handshake | |
28 | */ | |
1da177e4 LT |
29 | |
30 | #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
31 | #define SUPPORT_SYSRQ | |
32 | #endif | |
33 | ||
34 | #include <linux/module.h> | |
35 | #include <linux/ioport.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/console.h> | |
38 | #include <linux/sysrq.h> | |
d052d1be | 39 | #include <linux/platform_device.h> |
1da177e4 LT |
40 | #include <linux/tty.h> |
41 | #include <linux/tty_flip.h> | |
42 | #include <linux/serial_core.h> | |
43 | #include <linux/serial.h> | |
38a41fdf | 44 | #include <linux/clk.h> |
b6e49138 | 45 | #include <linux/delay.h> |
534fca06 | 46 | #include <linux/rational.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
22698aa2 SG |
48 | #include <linux/of.h> |
49 | #include <linux/of_device.h> | |
fed78ce4 | 50 | #include <linux/pinctrl/consumer.h> |
1da177e4 LT |
51 | |
52 | #include <asm/io.h> | |
53 | #include <asm/irq.h> | |
a09e64fb | 54 | #include <mach/imx-uart.h> |
1da177e4 | 55 | |
ff4bfb21 SH |
56 | /* Register definitions */ |
57 | #define URXD0 0x0 /* Receiver Register */ | |
58 | #define URTX0 0x40 /* Transmitter Register */ | |
59 | #define UCR1 0x80 /* Control Register 1 */ | |
60 | #define UCR2 0x84 /* Control Register 2 */ | |
61 | #define UCR3 0x88 /* Control Register 3 */ | |
62 | #define UCR4 0x8c /* Control Register 4 */ | |
63 | #define UFCR 0x90 /* FIFO Control Register */ | |
64 | #define USR1 0x94 /* Status Register 1 */ | |
65 | #define USR2 0x98 /* Status Register 2 */ | |
66 | #define UESC 0x9c /* Escape Character Register */ | |
67 | #define UTIM 0xa0 /* Escape Timer Register */ | |
68 | #define UBIR 0xa4 /* BRM Incremental Register */ | |
69 | #define UBMR 0xa8 /* BRM Modulator Register */ | |
70 | #define UBRC 0xac /* Baud Rate Count Register */ | |
fe6b540a SG |
71 | #define IMX21_ONEMS 0xb0 /* One Millisecond register */ |
72 | #define IMX1_UTS 0xd0 /* UART Test Register on i.mx1 */ | |
73 | #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/ | |
ff4bfb21 SH |
74 | |
75 | /* UART Control Register Bit Fields.*/ | |
76 | #define URXD_CHARRDY (1<<15) | |
77 | #define URXD_ERR (1<<14) | |
78 | #define URXD_OVRRUN (1<<13) | |
79 | #define URXD_FRMERR (1<<12) | |
80 | #define URXD_BRK (1<<11) | |
81 | #define URXD_PRERR (1<<10) | |
25985edc | 82 | #define UCR1_ADEN (1<<15) /* Auto detect interrupt */ |
ff4bfb21 SH |
83 | #define UCR1_ADBR (1<<14) /* Auto detect baud rate */ |
84 | #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */ | |
85 | #define UCR1_IDEN (1<<12) /* Idle condition interrupt */ | |
86 | #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */ | |
87 | #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */ | |
88 | #define UCR1_IREN (1<<7) /* Infrared interface enable */ | |
89 | #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */ | |
90 | #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */ | |
91 | #define UCR1_SNDBRK (1<<4) /* Send break */ | |
92 | #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */ | |
fe6b540a | 93 | #define IMX1_UCR1_UARTCLKEN (1<<2) /* UART clock enabled, i.mx1 only */ |
ff4bfb21 SH |
94 | #define UCR1_DOZE (1<<1) /* Doze */ |
95 | #define UCR1_UARTEN (1<<0) /* UART enabled */ | |
96 | #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */ | |
97 | #define UCR2_IRTS (1<<14) /* Ignore RTS pin */ | |
98 | #define UCR2_CTSC (1<<13) /* CTS pin control */ | |
99 | #define UCR2_CTS (1<<12) /* Clear to send */ | |
100 | #define UCR2_ESCEN (1<<11) /* Escape enable */ | |
101 | #define UCR2_PREN (1<<8) /* Parity enable */ | |
102 | #define UCR2_PROE (1<<7) /* Parity odd/even */ | |
103 | #define UCR2_STPB (1<<6) /* Stop */ | |
104 | #define UCR2_WS (1<<5) /* Word size */ | |
105 | #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */ | |
01f56abd | 106 | #define UCR2_ATEN (1<<3) /* Aging Timer Enable */ |
ff4bfb21 SH |
107 | #define UCR2_TXEN (1<<2) /* Transmitter enabled */ |
108 | #define UCR2_RXEN (1<<1) /* Receiver enabled */ | |
109 | #define UCR2_SRST (1<<0) /* SW reset */ | |
110 | #define UCR3_DTREN (1<<13) /* DTR interrupt enable */ | |
111 | #define UCR3_PARERREN (1<<12) /* Parity enable */ | |
112 | #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */ | |
113 | #define UCR3_DSR (1<<10) /* Data set ready */ | |
114 | #define UCR3_DCD (1<<9) /* Data carrier detect */ | |
115 | #define UCR3_RI (1<<8) /* Ring indicator */ | |
116 | #define UCR3_TIMEOUTEN (1<<7) /* Timeout interrupt enable */ | |
117 | #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */ | |
118 | #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */ | |
119 | #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */ | |
fe6b540a | 120 | #define IMX21_UCR3_RXDMUXSEL (1<<2) /* RXD Muxed Input Select */ |
ff4bfb21 SH |
121 | #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */ |
122 | #define UCR3_BPEN (1<<0) /* Preset registers enable */ | |
1c5250d6 VL |
123 | #define UCR4_CTSTL_SHF 10 /* CTS trigger level shift */ |
124 | #define UCR4_CTSTL_MASK 0x3F /* CTS trigger is 6 bits wide */ | |
ff4bfb21 SH |
125 | #define UCR4_INVR (1<<9) /* Inverted infrared reception */ |
126 | #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */ | |
127 | #define UCR4_WKEN (1<<7) /* Wake interrupt enable */ | |
128 | #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */ | |
129 | #define UCR4_IRSC (1<<5) /* IR special case */ | |
130 | #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */ | |
131 | #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */ | |
132 | #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */ | |
133 | #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */ | |
134 | #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */ | |
7be0670f | 135 | #define UFCR_DCEDTE (1<<6) /* DCE/DTE mode select */ |
ff4bfb21 | 136 | #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */ |
b6e49138 | 137 | #define UFCR_RFDIV_REG(x) (((x) < 7 ? 6 - (x) : 6) << 7) |
ff4bfb21 SH |
138 | #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */ |
139 | #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */ | |
140 | #define USR1_RTSS (1<<14) /* RTS pin status */ | |
141 | #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */ | |
142 | #define USR1_RTSD (1<<12) /* RTS delta */ | |
143 | #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */ | |
144 | #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */ | |
145 | #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */ | |
146 | #define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */ | |
147 | #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */ | |
148 | #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */ | |
149 | #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */ | |
150 | #define USR2_ADET (1<<15) /* Auto baud rate detect complete */ | |
151 | #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */ | |
152 | #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */ | |
153 | #define USR2_IDLE (1<<12) /* Idle condition */ | |
154 | #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */ | |
155 | #define USR2_WAKE (1<<7) /* Wake */ | |
156 | #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */ | |
157 | #define USR2_TXDC (1<<3) /* Transmitter complete */ | |
158 | #define USR2_BRCD (1<<2) /* Break condition */ | |
159 | #define USR2_ORE (1<<1) /* Overrun error */ | |
160 | #define USR2_RDR (1<<0) /* Recv data ready */ | |
161 | #define UTS_FRCPERR (1<<13) /* Force parity error */ | |
162 | #define UTS_LOOP (1<<12) /* Loop tx and rx */ | |
163 | #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */ | |
164 | #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */ | |
165 | #define UTS_TXFULL (1<<4) /* TxFIFO full */ | |
166 | #define UTS_RXFULL (1<<3) /* RxFIFO full */ | |
167 | #define UTS_SOFTRST (1<<0) /* Software reset */ | |
168 | ||
1da177e4 | 169 | /* We've been assigned a range on the "Low-density serial ports" major */ |
e3d13ff4 SH |
170 | #define SERIAL_IMX_MAJOR 207 |
171 | #define MINOR_START 16 | |
172 | #define DEV_NAME "ttymxc" | |
1da177e4 | 173 | |
1da177e4 LT |
174 | /* |
175 | * This determines how often we check the modem status signals | |
176 | * for any change. They generally aren't connected to an IRQ | |
177 | * so we have to poll them. We also check immediately before | |
178 | * filling the TX fifo incase CTS has been dropped. | |
179 | */ | |
180 | #define MCTRL_TIMEOUT (250*HZ/1000) | |
181 | ||
182 | #define DRIVER_NAME "IMX-uart" | |
183 | ||
dbff4e9e SH |
184 | #define UART_NR 8 |
185 | ||
fe6b540a SG |
186 | /* i.mx21 type uart runs on all i.mx except i.mx1 */ |
187 | enum imx_uart_type { | |
188 | IMX1_UART, | |
189 | IMX21_UART, | |
190 | }; | |
191 | ||
192 | /* device type dependent stuff */ | |
193 | struct imx_uart_data { | |
194 | unsigned uts_reg; | |
195 | enum imx_uart_type devtype; | |
196 | }; | |
197 | ||
1da177e4 LT |
198 | struct imx_port { |
199 | struct uart_port port; | |
200 | struct timer_list timer; | |
201 | unsigned int old_status; | |
5b802344 | 202 | int txirq,rxirq,rtsirq; |
26bbb3ff | 203 | unsigned int have_rtscts:1; |
b6e49138 FG |
204 | unsigned int use_irda:1; |
205 | unsigned int irda_inv_rx:1; | |
206 | unsigned int irda_inv_tx:1; | |
207 | unsigned short trcv_delay; /* transceiver delay */ | |
3a9465fa SH |
208 | struct clk *clk_ipg; |
209 | struct clk *clk_per; | |
7d0b066f | 210 | const struct imx_uart_data *devdata; |
1da177e4 LT |
211 | }; |
212 | ||
0ad5a814 DB |
213 | struct imx_port_ucrs { |
214 | unsigned int ucr1; | |
215 | unsigned int ucr2; | |
216 | unsigned int ucr3; | |
217 | }; | |
218 | ||
b6e49138 FG |
219 | #ifdef CONFIG_IRDA |
220 | #define USE_IRDA(sport) ((sport)->use_irda) | |
221 | #else | |
222 | #define USE_IRDA(sport) (0) | |
223 | #endif | |
224 | ||
fe6b540a SG |
225 | static struct imx_uart_data imx_uart_devdata[] = { |
226 | [IMX1_UART] = { | |
227 | .uts_reg = IMX1_UTS, | |
228 | .devtype = IMX1_UART, | |
229 | }, | |
230 | [IMX21_UART] = { | |
231 | .uts_reg = IMX21_UTS, | |
232 | .devtype = IMX21_UART, | |
233 | }, | |
234 | }; | |
235 | ||
236 | static struct platform_device_id imx_uart_devtype[] = { | |
237 | { | |
238 | .name = "imx1-uart", | |
239 | .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX1_UART], | |
240 | }, { | |
241 | .name = "imx21-uart", | |
242 | .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX21_UART], | |
243 | }, { | |
244 | /* sentinel */ | |
245 | } | |
246 | }; | |
247 | MODULE_DEVICE_TABLE(platform, imx_uart_devtype); | |
248 | ||
22698aa2 SG |
249 | static struct of_device_id imx_uart_dt_ids[] = { |
250 | { .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], }, | |
251 | { .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], }, | |
252 | { /* sentinel */ } | |
253 | }; | |
254 | MODULE_DEVICE_TABLE(of, imx_uart_dt_ids); | |
255 | ||
fe6b540a SG |
256 | static inline unsigned uts_reg(struct imx_port *sport) |
257 | { | |
258 | return sport->devdata->uts_reg; | |
259 | } | |
260 | ||
261 | static inline int is_imx1_uart(struct imx_port *sport) | |
262 | { | |
263 | return sport->devdata->devtype == IMX1_UART; | |
264 | } | |
265 | ||
266 | static inline int is_imx21_uart(struct imx_port *sport) | |
267 | { | |
268 | return sport->devdata->devtype == IMX21_UART; | |
269 | } | |
270 | ||
0ad5a814 DB |
271 | /* |
272 | * Save and restore functions for UCR1, UCR2 and UCR3 registers | |
273 | */ | |
274 | static void imx_port_ucrs_save(struct uart_port *port, | |
275 | struct imx_port_ucrs *ucr) | |
276 | { | |
277 | /* save control registers */ | |
278 | ucr->ucr1 = readl(port->membase + UCR1); | |
279 | ucr->ucr2 = readl(port->membase + UCR2); | |
280 | ucr->ucr3 = readl(port->membase + UCR3); | |
281 | } | |
282 | ||
283 | static void imx_port_ucrs_restore(struct uart_port *port, | |
284 | struct imx_port_ucrs *ucr) | |
285 | { | |
286 | /* restore control registers */ | |
287 | writel(ucr->ucr1, port->membase + UCR1); | |
288 | writel(ucr->ucr2, port->membase + UCR2); | |
289 | writel(ucr->ucr3, port->membase + UCR3); | |
290 | } | |
291 | ||
1da177e4 LT |
292 | /* |
293 | * Handle any change of modem status signal since we were last called. | |
294 | */ | |
295 | static void imx_mctrl_check(struct imx_port *sport) | |
296 | { | |
297 | unsigned int status, changed; | |
298 | ||
299 | status = sport->port.ops->get_mctrl(&sport->port); | |
300 | changed = status ^ sport->old_status; | |
301 | ||
302 | if (changed == 0) | |
303 | return; | |
304 | ||
305 | sport->old_status = status; | |
306 | ||
307 | if (changed & TIOCM_RI) | |
308 | sport->port.icount.rng++; | |
309 | if (changed & TIOCM_DSR) | |
310 | sport->port.icount.dsr++; | |
311 | if (changed & TIOCM_CAR) | |
312 | uart_handle_dcd_change(&sport->port, status & TIOCM_CAR); | |
313 | if (changed & TIOCM_CTS) | |
314 | uart_handle_cts_change(&sport->port, status & TIOCM_CTS); | |
315 | ||
bdc04e31 | 316 | wake_up_interruptible(&sport->port.state->port.delta_msr_wait); |
1da177e4 LT |
317 | } |
318 | ||
319 | /* | |
320 | * This is our per-port timeout handler, for checking the | |
321 | * modem status signals. | |
322 | */ | |
323 | static void imx_timeout(unsigned long data) | |
324 | { | |
325 | struct imx_port *sport = (struct imx_port *)data; | |
326 | unsigned long flags; | |
327 | ||
ebd2c8f6 | 328 | if (sport->port.state) { |
1da177e4 LT |
329 | spin_lock_irqsave(&sport->port.lock, flags); |
330 | imx_mctrl_check(sport); | |
331 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
332 | ||
333 | mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT); | |
334 | } | |
335 | } | |
336 | ||
337 | /* | |
338 | * interrupts disabled on entry | |
339 | */ | |
b129a8cc | 340 | static void imx_stop_tx(struct uart_port *port) |
1da177e4 LT |
341 | { |
342 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 SH |
343 | unsigned long temp; |
344 | ||
b6e49138 FG |
345 | if (USE_IRDA(sport)) { |
346 | /* half duplex - wait for end of transmission */ | |
347 | int n = 256; | |
348 | while ((--n > 0) && | |
349 | !(readl(sport->port.membase + USR2) & USR2_TXDC)) { | |
350 | udelay(5); | |
351 | barrier(); | |
352 | } | |
353 | /* | |
354 | * irda transceiver - wait a bit more to avoid | |
355 | * cutoff, hardware dependent | |
356 | */ | |
357 | udelay(sport->trcv_delay); | |
358 | ||
359 | /* | |
360 | * half duplex - reactivate receive mode, | |
361 | * flush receive pipe echo crap | |
362 | */ | |
363 | if (readl(sport->port.membase + USR2) & USR2_TXDC) { | |
364 | temp = readl(sport->port.membase + UCR1); | |
365 | temp &= ~(UCR1_TXMPTYEN | UCR1_TRDYEN); | |
366 | writel(temp, sport->port.membase + UCR1); | |
367 | ||
368 | temp = readl(sport->port.membase + UCR4); | |
369 | temp &= ~(UCR4_TCEN); | |
370 | writel(temp, sport->port.membase + UCR4); | |
371 | ||
372 | while (readl(sport->port.membase + URXD0) & | |
373 | URXD_CHARRDY) | |
374 | barrier(); | |
375 | ||
376 | temp = readl(sport->port.membase + UCR1); | |
377 | temp |= UCR1_RRDYEN; | |
378 | writel(temp, sport->port.membase + UCR1); | |
379 | ||
380 | temp = readl(sport->port.membase + UCR4); | |
381 | temp |= UCR4_DREN; | |
382 | writel(temp, sport->port.membase + UCR4); | |
383 | } | |
384 | return; | |
385 | } | |
386 | ||
ff4bfb21 SH |
387 | temp = readl(sport->port.membase + UCR1); |
388 | writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1); | |
1da177e4 LT |
389 | } |
390 | ||
391 | /* | |
392 | * interrupts disabled on entry | |
393 | */ | |
394 | static void imx_stop_rx(struct uart_port *port) | |
395 | { | |
396 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 SH |
397 | unsigned long temp; |
398 | ||
399 | temp = readl(sport->port.membase + UCR2); | |
400 | writel(temp &~ UCR2_RXEN, sport->port.membase + UCR2); | |
1da177e4 LT |
401 | } |
402 | ||
403 | /* | |
404 | * Set the modem control timer to fire immediately. | |
405 | */ | |
406 | static void imx_enable_ms(struct uart_port *port) | |
407 | { | |
408 | struct imx_port *sport = (struct imx_port *)port; | |
409 | ||
410 | mod_timer(&sport->timer, jiffies); | |
411 | } | |
412 | ||
413 | static inline void imx_transmit_buffer(struct imx_port *sport) | |
414 | { | |
ebd2c8f6 | 415 | struct circ_buf *xmit = &sport->port.state->xmit; |
1da177e4 | 416 | |
4e4e6602 | 417 | while (!uart_circ_empty(xmit) && |
fe6b540a SG |
418 | !(readl(sport->port.membase + uts_reg(sport)) |
419 | & UTS_TXFULL)) { | |
1da177e4 LT |
420 | /* send xmit->buf[xmit->tail] |
421 | * out the port here */ | |
ff4bfb21 | 422 | writel(xmit->buf[xmit->tail], sport->port.membase + URTX0); |
d3810cd4 | 423 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
1da177e4 | 424 | sport->port.icount.tx++; |
8c0b254b | 425 | } |
1da177e4 | 426 | |
97775731 FG |
427 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
428 | uart_write_wakeup(&sport->port); | |
429 | ||
1da177e4 | 430 | if (uart_circ_empty(xmit)) |
b129a8cc | 431 | imx_stop_tx(&sport->port); |
1da177e4 LT |
432 | } |
433 | ||
434 | /* | |
435 | * interrupts disabled on entry | |
436 | */ | |
b129a8cc | 437 | static void imx_start_tx(struct uart_port *port) |
1da177e4 LT |
438 | { |
439 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 | 440 | unsigned long temp; |
1da177e4 | 441 | |
b6e49138 FG |
442 | if (USE_IRDA(sport)) { |
443 | /* half duplex in IrDA mode; have to disable receive mode */ | |
444 | temp = readl(sport->port.membase + UCR4); | |
445 | temp &= ~(UCR4_DREN); | |
446 | writel(temp, sport->port.membase + UCR4); | |
447 | ||
448 | temp = readl(sport->port.membase + UCR1); | |
449 | temp &= ~(UCR1_RRDYEN); | |
450 | writel(temp, sport->port.membase + UCR1); | |
451 | } | |
452 | ||
ff4bfb21 SH |
453 | temp = readl(sport->port.membase + UCR1); |
454 | writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1); | |
1da177e4 | 455 | |
b6e49138 FG |
456 | if (USE_IRDA(sport)) { |
457 | temp = readl(sport->port.membase + UCR1); | |
458 | temp |= UCR1_TRDYEN; | |
459 | writel(temp, sport->port.membase + UCR1); | |
460 | ||
461 | temp = readl(sport->port.membase + UCR4); | |
462 | temp |= UCR4_TCEN; | |
463 | writel(temp, sport->port.membase + UCR4); | |
464 | } | |
465 | ||
fe6b540a | 466 | if (readl(sport->port.membase + uts_reg(sport)) & UTS_TXEMPTY) |
ff4bfb21 | 467 | imx_transmit_buffer(sport); |
1da177e4 LT |
468 | } |
469 | ||
7d12e780 | 470 | static irqreturn_t imx_rtsint(int irq, void *dev_id) |
ceca629e | 471 | { |
15aafa2f | 472 | struct imx_port *sport = dev_id; |
5680e941 | 473 | unsigned int val; |
ceca629e SH |
474 | unsigned long flags; |
475 | ||
476 | spin_lock_irqsave(&sport->port.lock, flags); | |
477 | ||
ff4bfb21 | 478 | writel(USR1_RTSD, sport->port.membase + USR1); |
5680e941 | 479 | val = readl(sport->port.membase + USR1) & USR1_RTSS; |
ceca629e | 480 | uart_handle_cts_change(&sport->port, !!val); |
bdc04e31 | 481 | wake_up_interruptible(&sport->port.state->port.delta_msr_wait); |
ceca629e SH |
482 | |
483 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
484 | return IRQ_HANDLED; | |
485 | } | |
486 | ||
7d12e780 | 487 | static irqreturn_t imx_txint(int irq, void *dev_id) |
1da177e4 | 488 | { |
15aafa2f | 489 | struct imx_port *sport = dev_id; |
ebd2c8f6 | 490 | struct circ_buf *xmit = &sport->port.state->xmit; |
1da177e4 LT |
491 | unsigned long flags; |
492 | ||
493 | spin_lock_irqsave(&sport->port.lock,flags); | |
494 | if (sport->port.x_char) | |
495 | { | |
496 | /* Send next char */ | |
ff4bfb21 | 497 | writel(sport->port.x_char, sport->port.membase + URTX0); |
1da177e4 LT |
498 | goto out; |
499 | } | |
500 | ||
501 | if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { | |
b129a8cc | 502 | imx_stop_tx(&sport->port); |
1da177e4 LT |
503 | goto out; |
504 | } | |
505 | ||
506 | imx_transmit_buffer(sport); | |
507 | ||
508 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
509 | uart_write_wakeup(&sport->port); | |
510 | ||
511 | out: | |
512 | spin_unlock_irqrestore(&sport->port.lock,flags); | |
513 | return IRQ_HANDLED; | |
514 | } | |
515 | ||
7d12e780 | 516 | static irqreturn_t imx_rxint(int irq, void *dev_id) |
1da177e4 LT |
517 | { |
518 | struct imx_port *sport = dev_id; | |
519 | unsigned int rx,flg,ignored = 0; | |
ebd2c8f6 | 520 | struct tty_struct *tty = sport->port.state->port.tty; |
ff4bfb21 | 521 | unsigned long flags, temp; |
1da177e4 | 522 | |
1da177e4 LT |
523 | spin_lock_irqsave(&sport->port.lock,flags); |
524 | ||
0d3c3938 | 525 | while (readl(sport->port.membase + USR2) & USR2_RDR) { |
1da177e4 LT |
526 | flg = TTY_NORMAL; |
527 | sport->port.icount.rx++; | |
528 | ||
0d3c3938 SH |
529 | rx = readl(sport->port.membase + URXD0); |
530 | ||
ff4bfb21 | 531 | temp = readl(sport->port.membase + USR2); |
864eeed0 | 532 | if (temp & USR2_BRCD) { |
94d32f99 | 533 | writel(USR2_BRCD, sport->port.membase + USR2); |
864eeed0 SH |
534 | if (uart_handle_break(&sport->port)) |
535 | continue; | |
1da177e4 LT |
536 | } |
537 | ||
d3810cd4 | 538 | if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx)) |
864eeed0 SH |
539 | continue; |
540 | ||
019dc9ea HW |
541 | if (unlikely(rx & URXD_ERR)) { |
542 | if (rx & URXD_BRK) | |
543 | sport->port.icount.brk++; | |
544 | else if (rx & URXD_PRERR) | |
864eeed0 SH |
545 | sport->port.icount.parity++; |
546 | else if (rx & URXD_FRMERR) | |
547 | sport->port.icount.frame++; | |
548 | if (rx & URXD_OVRRUN) | |
549 | sport->port.icount.overrun++; | |
550 | ||
551 | if (rx & sport->port.ignore_status_mask) { | |
552 | if (++ignored > 100) | |
553 | goto out; | |
554 | continue; | |
555 | } | |
556 | ||
557 | rx &= sport->port.read_status_mask; | |
558 | ||
019dc9ea HW |
559 | if (rx & URXD_BRK) |
560 | flg = TTY_BREAK; | |
561 | else if (rx & URXD_PRERR) | |
864eeed0 SH |
562 | flg = TTY_PARITY; |
563 | else if (rx & URXD_FRMERR) | |
564 | flg = TTY_FRAME; | |
565 | if (rx & URXD_OVRRUN) | |
566 | flg = TTY_OVERRUN; | |
1da177e4 | 567 | |
864eeed0 SH |
568 | #ifdef SUPPORT_SYSRQ |
569 | sport->port.sysrq = 0; | |
570 | #endif | |
571 | } | |
1da177e4 | 572 | |
1da177e4 | 573 | tty_insert_flip_char(tty, rx, flg); |
864eeed0 | 574 | } |
1da177e4 LT |
575 | |
576 | out: | |
577 | spin_unlock_irqrestore(&sport->port.lock,flags); | |
578 | tty_flip_buffer_push(tty); | |
579 | return IRQ_HANDLED; | |
1da177e4 LT |
580 | } |
581 | ||
e3d13ff4 SH |
582 | static irqreturn_t imx_int(int irq, void *dev_id) |
583 | { | |
584 | struct imx_port *sport = dev_id; | |
585 | unsigned int sts; | |
586 | ||
587 | sts = readl(sport->port.membase + USR1); | |
588 | ||
589 | if (sts & USR1_RRDY) | |
590 | imx_rxint(irq, dev_id); | |
591 | ||
592 | if (sts & USR1_TRDY && | |
593 | readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) | |
594 | imx_txint(irq, dev_id); | |
595 | ||
9fbe6044 | 596 | if (sts & USR1_RTSD) |
e3d13ff4 SH |
597 | imx_rtsint(irq, dev_id); |
598 | ||
db1a9b55 FE |
599 | if (sts & USR1_AWAKE) |
600 | writel(USR1_AWAKE, sport->port.membase + USR1); | |
601 | ||
e3d13ff4 SH |
602 | return IRQ_HANDLED; |
603 | } | |
604 | ||
1da177e4 LT |
605 | /* |
606 | * Return TIOCSER_TEMT when transmitter is not busy. | |
607 | */ | |
608 | static unsigned int imx_tx_empty(struct uart_port *port) | |
609 | { | |
610 | struct imx_port *sport = (struct imx_port *)port; | |
611 | ||
ff4bfb21 | 612 | return (readl(sport->port.membase + USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0; |
1da177e4 LT |
613 | } |
614 | ||
0f302dc3 SH |
615 | /* |
616 | * We have a modem side uart, so the meanings of RTS and CTS are inverted. | |
617 | */ | |
1da177e4 LT |
618 | static unsigned int imx_get_mctrl(struct uart_port *port) |
619 | { | |
d3810cd4 OS |
620 | struct imx_port *sport = (struct imx_port *)port; |
621 | unsigned int tmp = TIOCM_DSR | TIOCM_CAR; | |
0f302dc3 | 622 | |
d3810cd4 OS |
623 | if (readl(sport->port.membase + USR1) & USR1_RTSS) |
624 | tmp |= TIOCM_CTS; | |
0f302dc3 | 625 | |
d3810cd4 OS |
626 | if (readl(sport->port.membase + UCR2) & UCR2_CTS) |
627 | tmp |= TIOCM_RTS; | |
0f302dc3 | 628 | |
d3810cd4 | 629 | return tmp; |
1da177e4 LT |
630 | } |
631 | ||
632 | static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
633 | { | |
d3810cd4 | 634 | struct imx_port *sport = (struct imx_port *)port; |
ff4bfb21 SH |
635 | unsigned long temp; |
636 | ||
637 | temp = readl(sport->port.membase + UCR2) & ~UCR2_CTS; | |
0f302dc3 | 638 | |
d3810cd4 | 639 | if (mctrl & TIOCM_RTS) |
ff4bfb21 SH |
640 | temp |= UCR2_CTS; |
641 | ||
642 | writel(temp, sport->port.membase + UCR2); | |
1da177e4 LT |
643 | } |
644 | ||
645 | /* | |
646 | * Interrupts always disabled. | |
647 | */ | |
648 | static void imx_break_ctl(struct uart_port *port, int break_state) | |
649 | { | |
650 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 | 651 | unsigned long flags, temp; |
1da177e4 LT |
652 | |
653 | spin_lock_irqsave(&sport->port.lock, flags); | |
654 | ||
ff4bfb21 SH |
655 | temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK; |
656 | ||
1da177e4 | 657 | if ( break_state != 0 ) |
ff4bfb21 SH |
658 | temp |= UCR1_SNDBRK; |
659 | ||
660 | writel(temp, sport->port.membase + UCR1); | |
1da177e4 LT |
661 | |
662 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
663 | } | |
664 | ||
665 | #define TXTL 2 /* reset default */ | |
666 | #define RXTL 1 /* reset default */ | |
667 | ||
587897f5 SH |
668 | static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode) |
669 | { | |
670 | unsigned int val; | |
587897f5 | 671 | |
7be0670f DB |
672 | /* set receiver / transmitter trigger level */ |
673 | val = readl(sport->port.membase + UFCR) & (UFCR_RFDIV | UFCR_DCEDTE); | |
674 | val |= TXTL << UFCR_TXTL_SHF | RXTL; | |
ff4bfb21 | 675 | writel(val, sport->port.membase + UFCR); |
587897f5 SH |
676 | return 0; |
677 | } | |
678 | ||
1c5250d6 VL |
679 | /* half the RX buffer size */ |
680 | #define CTSTL 16 | |
681 | ||
1da177e4 LT |
682 | static int imx_startup(struct uart_port *port) |
683 | { | |
684 | struct imx_port *sport = (struct imx_port *)port; | |
685 | int retval; | |
ff4bfb21 | 686 | unsigned long flags, temp; |
1da177e4 | 687 | |
587897f5 | 688 | imx_setup_ufcr(sport, 0); |
1da177e4 LT |
689 | |
690 | /* disable the DREN bit (Data Ready interrupt enable) before | |
691 | * requesting IRQs | |
692 | */ | |
ff4bfb21 | 693 | temp = readl(sport->port.membase + UCR4); |
b6e49138 FG |
694 | |
695 | if (USE_IRDA(sport)) | |
696 | temp |= UCR4_IRSC; | |
697 | ||
1c5250d6 VL |
698 | /* set the trigger level for CTS */ |
699 | temp &= ~(UCR4_CTSTL_MASK<< UCR4_CTSTL_SHF); | |
700 | temp |= CTSTL<< UCR4_CTSTL_SHF; | |
701 | ||
ff4bfb21 | 702 | writel(temp & ~UCR4_DREN, sport->port.membase + UCR4); |
1da177e4 | 703 | |
b6e49138 FG |
704 | if (USE_IRDA(sport)) { |
705 | /* reset fifo's and state machines */ | |
706 | int i = 100; | |
707 | temp = readl(sport->port.membase + UCR2); | |
708 | temp &= ~UCR2_SRST; | |
709 | writel(temp, sport->port.membase + UCR2); | |
710 | while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && | |
711 | (--i > 0)) { | |
712 | udelay(1); | |
713 | } | |
714 | } | |
715 | ||
1da177e4 | 716 | /* |
e3d13ff4 SH |
717 | * Allocate the IRQ(s) i.MX1 has three interrupts whereas later |
718 | * chips only have one interrupt. | |
1da177e4 | 719 | */ |
e3d13ff4 SH |
720 | if (sport->txirq > 0) { |
721 | retval = request_irq(sport->rxirq, imx_rxint, 0, | |
722 | DRIVER_NAME, sport); | |
723 | if (retval) | |
724 | goto error_out1; | |
725 | ||
726 | retval = request_irq(sport->txirq, imx_txint, 0, | |
727 | DRIVER_NAME, sport); | |
728 | if (retval) | |
729 | goto error_out2; | |
730 | ||
b6e49138 FG |
731 | /* do not use RTS IRQ on IrDA */ |
732 | if (!USE_IRDA(sport)) { | |
1ee8f65b | 733 | retval = request_irq(sport->rtsirq, imx_rtsint, 0, |
b6e49138 FG |
734 | DRIVER_NAME, sport); |
735 | if (retval) | |
736 | goto error_out3; | |
737 | } | |
e3d13ff4 SH |
738 | } else { |
739 | retval = request_irq(sport->port.irq, imx_int, 0, | |
740 | DRIVER_NAME, sport); | |
741 | if (retval) { | |
742 | free_irq(sport->port.irq, sport); | |
743 | goto error_out1; | |
744 | } | |
745 | } | |
ceca629e | 746 | |
9ec1882d | 747 | spin_lock_irqsave(&sport->port.lock, flags); |
1da177e4 LT |
748 | /* |
749 | * Finally, clear and enable interrupts | |
750 | */ | |
ff4bfb21 SH |
751 | writel(USR1_RTSD, sport->port.membase + USR1); |
752 | ||
753 | temp = readl(sport->port.membase + UCR1); | |
789d5258 | 754 | temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN; |
b6e49138 FG |
755 | |
756 | if (USE_IRDA(sport)) { | |
757 | temp |= UCR1_IREN; | |
758 | temp &= ~(UCR1_RTSDEN); | |
759 | } | |
760 | ||
ff4bfb21 | 761 | writel(temp, sport->port.membase + UCR1); |
1da177e4 | 762 | |
ff4bfb21 SH |
763 | temp = readl(sport->port.membase + UCR2); |
764 | temp |= (UCR2_RXEN | UCR2_TXEN); | |
765 | writel(temp, sport->port.membase + UCR2); | |
1da177e4 | 766 | |
b6e49138 FG |
767 | if (USE_IRDA(sport)) { |
768 | /* clear RX-FIFO */ | |
769 | int i = 64; | |
770 | while ((--i > 0) && | |
771 | (readl(sport->port.membase + URXD0) & URXD_CHARRDY)) { | |
772 | barrier(); | |
773 | } | |
774 | } | |
775 | ||
fe6b540a | 776 | if (is_imx21_uart(sport)) { |
37d6fb62 | 777 | temp = readl(sport->port.membase + UCR3); |
fe6b540a | 778 | temp |= IMX21_UCR3_RXDMUXSEL; |
37d6fb62 SH |
779 | writel(temp, sport->port.membase + UCR3); |
780 | } | |
4411805b | 781 | |
b6e49138 FG |
782 | if (USE_IRDA(sport)) { |
783 | temp = readl(sport->port.membase + UCR4); | |
784 | if (sport->irda_inv_rx) | |
785 | temp |= UCR4_INVR; | |
786 | else | |
787 | temp &= ~(UCR4_INVR); | |
788 | writel(temp | UCR4_DREN, sport->port.membase + UCR4); | |
789 | ||
790 | temp = readl(sport->port.membase + UCR3); | |
791 | if (sport->irda_inv_tx) | |
792 | temp |= UCR3_INVT; | |
793 | else | |
794 | temp &= ~(UCR3_INVT); | |
795 | writel(temp, sport->port.membase + UCR3); | |
796 | } | |
797 | ||
1da177e4 LT |
798 | /* |
799 | * Enable modem status interrupts | |
800 | */ | |
1da177e4 LT |
801 | imx_enable_ms(&sport->port); |
802 | spin_unlock_irqrestore(&sport->port.lock,flags); | |
803 | ||
b6e49138 FG |
804 | if (USE_IRDA(sport)) { |
805 | struct imxuart_platform_data *pdata; | |
806 | pdata = sport->port.dev->platform_data; | |
807 | sport->irda_inv_rx = pdata->irda_inv_rx; | |
808 | sport->irda_inv_tx = pdata->irda_inv_tx; | |
809 | sport->trcv_delay = pdata->transceiver_delay; | |
810 | if (pdata->irda_enable) | |
811 | pdata->irda_enable(1); | |
812 | } | |
813 | ||
1da177e4 LT |
814 | return 0; |
815 | ||
ceca629e | 816 | error_out3: |
e3d13ff4 SH |
817 | if (sport->txirq) |
818 | free_irq(sport->txirq, sport); | |
1da177e4 | 819 | error_out2: |
e3d13ff4 SH |
820 | if (sport->rxirq) |
821 | free_irq(sport->rxirq, sport); | |
86371d07 | 822 | error_out1: |
1da177e4 LT |
823 | return retval; |
824 | } | |
825 | ||
826 | static void imx_shutdown(struct uart_port *port) | |
827 | { | |
828 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 | 829 | unsigned long temp; |
9ec1882d | 830 | unsigned long flags; |
1da177e4 | 831 | |
9ec1882d | 832 | spin_lock_irqsave(&sport->port.lock, flags); |
2e146392 FG |
833 | temp = readl(sport->port.membase + UCR2); |
834 | temp &= ~(UCR2_TXEN); | |
835 | writel(temp, sport->port.membase + UCR2); | |
9ec1882d | 836 | spin_unlock_irqrestore(&sport->port.lock, flags); |
2e146392 | 837 | |
b6e49138 FG |
838 | if (USE_IRDA(sport)) { |
839 | struct imxuart_platform_data *pdata; | |
840 | pdata = sport->port.dev->platform_data; | |
841 | if (pdata->irda_enable) | |
842 | pdata->irda_enable(0); | |
843 | } | |
844 | ||
1da177e4 LT |
845 | /* |
846 | * Stop our timer. | |
847 | */ | |
848 | del_timer_sync(&sport->timer); | |
849 | ||
850 | /* | |
851 | * Free the interrupts | |
852 | */ | |
e3d13ff4 | 853 | if (sport->txirq > 0) { |
b6e49138 FG |
854 | if (!USE_IRDA(sport)) |
855 | free_irq(sport->rtsirq, sport); | |
e3d13ff4 SH |
856 | free_irq(sport->txirq, sport); |
857 | free_irq(sport->rxirq, sport); | |
858 | } else | |
859 | free_irq(sport->port.irq, sport); | |
1da177e4 LT |
860 | |
861 | /* | |
862 | * Disable all interrupts, port and break condition. | |
863 | */ | |
864 | ||
9ec1882d | 865 | spin_lock_irqsave(&sport->port.lock, flags); |
ff4bfb21 SH |
866 | temp = readl(sport->port.membase + UCR1); |
867 | temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN); | |
b6e49138 FG |
868 | if (USE_IRDA(sport)) |
869 | temp &= ~(UCR1_IREN); | |
870 | ||
ff4bfb21 | 871 | writel(temp, sport->port.membase + UCR1); |
9ec1882d | 872 | spin_unlock_irqrestore(&sport->port.lock, flags); |
1da177e4 LT |
873 | } |
874 | ||
875 | static void | |
606d099c AC |
876 | imx_set_termios(struct uart_port *port, struct ktermios *termios, |
877 | struct ktermios *old) | |
1da177e4 LT |
878 | { |
879 | struct imx_port *sport = (struct imx_port *)port; | |
880 | unsigned long flags; | |
881 | unsigned int ucr2, old_ucr1, old_txrxen, baud, quot; | |
882 | unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; | |
534fca06 OS |
883 | unsigned int div, ufcr; |
884 | unsigned long num, denom; | |
d7f8d437 | 885 | uint64_t tdiv64; |
1da177e4 LT |
886 | |
887 | /* | |
888 | * If we don't support modem control lines, don't allow | |
889 | * these to be set. | |
890 | */ | |
891 | if (0) { | |
892 | termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR); | |
893 | termios->c_cflag |= CLOCAL; | |
894 | } | |
895 | ||
896 | /* | |
897 | * We only support CS7 and CS8. | |
898 | */ | |
899 | while ((termios->c_cflag & CSIZE) != CS7 && | |
900 | (termios->c_cflag & CSIZE) != CS8) { | |
901 | termios->c_cflag &= ~CSIZE; | |
902 | termios->c_cflag |= old_csize; | |
903 | old_csize = CS8; | |
904 | } | |
905 | ||
906 | if ((termios->c_cflag & CSIZE) == CS8) | |
907 | ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS; | |
908 | else | |
909 | ucr2 = UCR2_SRST | UCR2_IRTS; | |
910 | ||
911 | if (termios->c_cflag & CRTSCTS) { | |
5b802344 SH |
912 | if( sport->have_rtscts ) { |
913 | ucr2 &= ~UCR2_IRTS; | |
914 | ucr2 |= UCR2_CTSC; | |
915 | } else { | |
916 | termios->c_cflag &= ~CRTSCTS; | |
917 | } | |
1da177e4 LT |
918 | } |
919 | ||
920 | if (termios->c_cflag & CSTOPB) | |
921 | ucr2 |= UCR2_STPB; | |
922 | if (termios->c_cflag & PARENB) { | |
923 | ucr2 |= UCR2_PREN; | |
3261e362 | 924 | if (termios->c_cflag & PARODD) |
1da177e4 LT |
925 | ucr2 |= UCR2_PROE; |
926 | } | |
927 | ||
995234da EM |
928 | del_timer_sync(&sport->timer); |
929 | ||
1da177e4 LT |
930 | /* |
931 | * Ask the core to calculate the divisor for us. | |
932 | */ | |
036bb15e | 933 | baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16); |
1da177e4 LT |
934 | quot = uart_get_divisor(port, baud); |
935 | ||
936 | spin_lock_irqsave(&sport->port.lock, flags); | |
937 | ||
938 | sport->port.read_status_mask = 0; | |
939 | if (termios->c_iflag & INPCK) | |
940 | sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR); | |
941 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
942 | sport->port.read_status_mask |= URXD_BRK; | |
943 | ||
944 | /* | |
945 | * Characters to ignore | |
946 | */ | |
947 | sport->port.ignore_status_mask = 0; | |
948 | if (termios->c_iflag & IGNPAR) | |
949 | sport->port.ignore_status_mask |= URXD_PRERR; | |
950 | if (termios->c_iflag & IGNBRK) { | |
951 | sport->port.ignore_status_mask |= URXD_BRK; | |
952 | /* | |
953 | * If we're ignoring parity and break indicators, | |
954 | * ignore overruns too (for real raw support). | |
955 | */ | |
956 | if (termios->c_iflag & IGNPAR) | |
957 | sport->port.ignore_status_mask |= URXD_OVRRUN; | |
958 | } | |
959 | ||
1da177e4 LT |
960 | /* |
961 | * Update the per-port timeout. | |
962 | */ | |
963 | uart_update_timeout(port, termios->c_cflag, baud); | |
964 | ||
965 | /* | |
966 | * disable interrupts and drain transmitter | |
967 | */ | |
ff4bfb21 SH |
968 | old_ucr1 = readl(sport->port.membase + UCR1); |
969 | writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN), | |
970 | sport->port.membase + UCR1); | |
1da177e4 | 971 | |
ff4bfb21 | 972 | while ( !(readl(sport->port.membase + USR2) & USR2_TXDC)) |
1da177e4 LT |
973 | barrier(); |
974 | ||
975 | /* then, disable everything */ | |
ff4bfb21 SH |
976 | old_txrxen = readl(sport->port.membase + UCR2); |
977 | writel(old_txrxen & ~( UCR2_TXEN | UCR2_RXEN), | |
978 | sport->port.membase + UCR2); | |
979 | old_txrxen &= (UCR2_TXEN | UCR2_RXEN); | |
1da177e4 | 980 | |
b6e49138 FG |
981 | if (USE_IRDA(sport)) { |
982 | /* | |
983 | * use maximum available submodule frequency to | |
984 | * avoid missing short pulses due to low sampling rate | |
985 | */ | |
036bb15e | 986 | div = 1; |
b6e49138 FG |
987 | } else { |
988 | div = sport->port.uartclk / (baud * 16); | |
989 | if (div > 7) | |
990 | div = 7; | |
991 | if (!div) | |
992 | div = 1; | |
993 | } | |
036bb15e | 994 | |
534fca06 OS |
995 | rational_best_approximation(16 * div * baud, sport->port.uartclk, |
996 | 1 << 16, 1 << 16, &num, &denom); | |
036bb15e | 997 | |
eab4f5af AC |
998 | tdiv64 = sport->port.uartclk; |
999 | tdiv64 *= num; | |
1000 | do_div(tdiv64, denom * 16 * div); | |
1001 | tty_termios_encode_baud_rate(termios, | |
1a2c4b31 | 1002 | (speed_t)tdiv64, (speed_t)tdiv64); |
d7f8d437 | 1003 | |
534fca06 OS |
1004 | num -= 1; |
1005 | denom -= 1; | |
036bb15e SH |
1006 | |
1007 | ufcr = readl(sport->port.membase + UFCR); | |
b6e49138 | 1008 | ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div); |
036bb15e SH |
1009 | writel(ufcr, sport->port.membase + UFCR); |
1010 | ||
534fca06 OS |
1011 | writel(num, sport->port.membase + UBIR); |
1012 | writel(denom, sport->port.membase + UBMR); | |
1013 | ||
fe6b540a | 1014 | if (is_imx21_uart(sport)) |
37d6fb62 | 1015 | writel(sport->port.uartclk / div / 1000, |
fe6b540a | 1016 | sport->port.membase + IMX21_ONEMS); |
ff4bfb21 SH |
1017 | |
1018 | writel(old_ucr1, sport->port.membase + UCR1); | |
1da177e4 | 1019 | |
ff4bfb21 SH |
1020 | /* set the parity, stop bits and data size */ |
1021 | writel(ucr2 | old_txrxen, sport->port.membase + UCR2); | |
1da177e4 LT |
1022 | |
1023 | if (UART_ENABLE_MS(&sport->port, termios->c_cflag)) | |
1024 | imx_enable_ms(&sport->port); | |
1025 | ||
1026 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
1027 | } | |
1028 | ||
1029 | static const char *imx_type(struct uart_port *port) | |
1030 | { | |
1031 | struct imx_port *sport = (struct imx_port *)port; | |
1032 | ||
1033 | return sport->port.type == PORT_IMX ? "IMX" : NULL; | |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * Release the memory region(s) being used by 'port'. | |
1038 | */ | |
1039 | static void imx_release_port(struct uart_port *port) | |
1040 | { | |
3d454446 SH |
1041 | struct platform_device *pdev = to_platform_device(port->dev); |
1042 | struct resource *mmres; | |
1da177e4 | 1043 | |
3d454446 | 1044 | mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
28f65c11 | 1045 | release_mem_region(mmres->start, resource_size(mmres)); |
1da177e4 LT |
1046 | } |
1047 | ||
1048 | /* | |
1049 | * Request the memory region(s) being used by 'port'. | |
1050 | */ | |
1051 | static int imx_request_port(struct uart_port *port) | |
1052 | { | |
3d454446 SH |
1053 | struct platform_device *pdev = to_platform_device(port->dev); |
1054 | struct resource *mmres; | |
1055 | void *ret; | |
1056 | ||
1057 | mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1058 | if (!mmres) | |
1059 | return -ENODEV; | |
1060 | ||
28f65c11 | 1061 | ret = request_mem_region(mmres->start, resource_size(mmres), "imx-uart"); |
1da177e4 | 1062 | |
3d454446 | 1063 | return ret ? 0 : -EBUSY; |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | /* | |
1067 | * Configure/autoconfigure the port. | |
1068 | */ | |
1069 | static void imx_config_port(struct uart_port *port, int flags) | |
1070 | { | |
1071 | struct imx_port *sport = (struct imx_port *)port; | |
1072 | ||
1073 | if (flags & UART_CONFIG_TYPE && | |
1074 | imx_request_port(&sport->port) == 0) | |
1075 | sport->port.type = PORT_IMX; | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Verify the new serial_struct (for TIOCSSERIAL). | |
1080 | * The only change we allow are to the flags and type, and | |
1081 | * even then only between PORT_IMX and PORT_UNKNOWN | |
1082 | */ | |
1083 | static int | |
1084 | imx_verify_port(struct uart_port *port, struct serial_struct *ser) | |
1085 | { | |
1086 | struct imx_port *sport = (struct imx_port *)port; | |
1087 | int ret = 0; | |
1088 | ||
1089 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX) | |
1090 | ret = -EINVAL; | |
1091 | if (sport->port.irq != ser->irq) | |
1092 | ret = -EINVAL; | |
1093 | if (ser->io_type != UPIO_MEM) | |
1094 | ret = -EINVAL; | |
1095 | if (sport->port.uartclk / 16 != ser->baud_base) | |
1096 | ret = -EINVAL; | |
1097 | if ((void *)sport->port.mapbase != ser->iomem_base) | |
1098 | ret = -EINVAL; | |
1099 | if (sport->port.iobase != ser->port) | |
1100 | ret = -EINVAL; | |
1101 | if (ser->hub6 != 0) | |
1102 | ret = -EINVAL; | |
1103 | return ret; | |
1104 | } | |
1105 | ||
01f56abd SA |
1106 | #if defined(CONFIG_CONSOLE_POLL) |
1107 | static int imx_poll_get_char(struct uart_port *port) | |
1108 | { | |
1109 | struct imx_port_ucrs old_ucr; | |
1110 | unsigned int status; | |
1111 | unsigned char c; | |
1112 | ||
1113 | /* save control registers */ | |
1114 | imx_port_ucrs_save(port, &old_ucr); | |
1115 | ||
1116 | /* disable interrupts */ | |
1117 | writel(UCR1_UARTEN, port->membase + UCR1); | |
1118 | writel(old_ucr.ucr2 & ~(UCR2_ATEN | UCR2_RTSEN | UCR2_ESCI), | |
1119 | port->membase + UCR2); | |
1120 | writel(old_ucr.ucr3 & ~(UCR3_DCD | UCR3_RI | UCR3_DTREN), | |
1121 | port->membase + UCR3); | |
1122 | ||
1123 | /* poll */ | |
1124 | do { | |
1125 | status = readl(port->membase + USR2); | |
1126 | } while (~status & USR2_RDR); | |
1127 | ||
1128 | /* read */ | |
1129 | c = readl(port->membase + URXD0); | |
1130 | ||
1131 | /* restore control registers */ | |
1132 | imx_port_ucrs_restore(port, &old_ucr); | |
1133 | ||
1134 | return c; | |
1135 | } | |
1136 | ||
1137 | static void imx_poll_put_char(struct uart_port *port, unsigned char c) | |
1138 | { | |
1139 | struct imx_port_ucrs old_ucr; | |
1140 | unsigned int status; | |
1141 | ||
1142 | /* save control registers */ | |
1143 | imx_port_ucrs_save(port, &old_ucr); | |
1144 | ||
1145 | /* disable interrupts */ | |
1146 | writel(UCR1_UARTEN, port->membase + UCR1); | |
1147 | writel(old_ucr.ucr2 & ~(UCR2_ATEN | UCR2_RTSEN | UCR2_ESCI), | |
1148 | port->membase + UCR2); | |
1149 | writel(old_ucr.ucr3 & ~(UCR3_DCD | UCR3_RI | UCR3_DTREN), | |
1150 | port->membase + UCR3); | |
1151 | ||
1152 | /* drain */ | |
1153 | do { | |
1154 | status = readl(port->membase + USR1); | |
1155 | } while (~status & USR1_TRDY); | |
1156 | ||
1157 | /* write */ | |
1158 | writel(c, port->membase + URTX0); | |
1159 | ||
1160 | /* flush */ | |
1161 | do { | |
1162 | status = readl(port->membase + USR2); | |
1163 | } while (~status & USR2_TXDC); | |
1164 | ||
1165 | /* restore control registers */ | |
1166 | imx_port_ucrs_restore(port, &old_ucr); | |
1167 | } | |
1168 | #endif | |
1169 | ||
1da177e4 LT |
1170 | static struct uart_ops imx_pops = { |
1171 | .tx_empty = imx_tx_empty, | |
1172 | .set_mctrl = imx_set_mctrl, | |
1173 | .get_mctrl = imx_get_mctrl, | |
1174 | .stop_tx = imx_stop_tx, | |
1175 | .start_tx = imx_start_tx, | |
1176 | .stop_rx = imx_stop_rx, | |
1177 | .enable_ms = imx_enable_ms, | |
1178 | .break_ctl = imx_break_ctl, | |
1179 | .startup = imx_startup, | |
1180 | .shutdown = imx_shutdown, | |
1181 | .set_termios = imx_set_termios, | |
1182 | .type = imx_type, | |
1183 | .release_port = imx_release_port, | |
1184 | .request_port = imx_request_port, | |
1185 | .config_port = imx_config_port, | |
1186 | .verify_port = imx_verify_port, | |
01f56abd SA |
1187 | #if defined(CONFIG_CONSOLE_POLL) |
1188 | .poll_get_char = imx_poll_get_char, | |
1189 | .poll_put_char = imx_poll_put_char, | |
1190 | #endif | |
1da177e4 LT |
1191 | }; |
1192 | ||
dbff4e9e | 1193 | static struct imx_port *imx_ports[UART_NR]; |
1da177e4 LT |
1194 | |
1195 | #ifdef CONFIG_SERIAL_IMX_CONSOLE | |
d358788f RK |
1196 | static void imx_console_putchar(struct uart_port *port, int ch) |
1197 | { | |
1198 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 | 1199 | |
fe6b540a | 1200 | while (readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL) |
d358788f | 1201 | barrier(); |
ff4bfb21 SH |
1202 | |
1203 | writel(ch, sport->port.membase + URTX0); | |
d358788f | 1204 | } |
1da177e4 LT |
1205 | |
1206 | /* | |
1207 | * Interrupts are disabled on entering | |
1208 | */ | |
1209 | static void | |
1210 | imx_console_write(struct console *co, const char *s, unsigned int count) | |
1211 | { | |
dbff4e9e | 1212 | struct imx_port *sport = imx_ports[co->index]; |
0ad5a814 DB |
1213 | struct imx_port_ucrs old_ucr; |
1214 | unsigned int ucr1; | |
9ec1882d XC |
1215 | unsigned long flags; |
1216 | ||
1217 | spin_lock_irqsave(&sport->port.lock, flags); | |
1da177e4 LT |
1218 | |
1219 | /* | |
0ad5a814 | 1220 | * First, save UCR1/2/3 and then disable interrupts |
1da177e4 | 1221 | */ |
0ad5a814 DB |
1222 | imx_port_ucrs_save(&sport->port, &old_ucr); |
1223 | ucr1 = old_ucr.ucr1; | |
1da177e4 | 1224 | |
fe6b540a SG |
1225 | if (is_imx1_uart(sport)) |
1226 | ucr1 |= IMX1_UCR1_UARTCLKEN; | |
37d6fb62 SH |
1227 | ucr1 |= UCR1_UARTEN; |
1228 | ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN); | |
1229 | ||
1230 | writel(ucr1, sport->port.membase + UCR1); | |
ff4bfb21 | 1231 | |
0ad5a814 | 1232 | writel(old_ucr.ucr2 | UCR2_TXEN, sport->port.membase + UCR2); |
1da177e4 | 1233 | |
d358788f | 1234 | uart_console_write(&sport->port, s, count, imx_console_putchar); |
1da177e4 LT |
1235 | |
1236 | /* | |
1237 | * Finally, wait for transmitter to become empty | |
0ad5a814 | 1238 | * and restore UCR1/2/3 |
1da177e4 | 1239 | */ |
ff4bfb21 | 1240 | while (!(readl(sport->port.membase + USR2) & USR2_TXDC)); |
1da177e4 | 1241 | |
0ad5a814 | 1242 | imx_port_ucrs_restore(&sport->port, &old_ucr); |
9ec1882d XC |
1243 | |
1244 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
1da177e4 LT |
1245 | } |
1246 | ||
1247 | /* | |
1248 | * If the port was already initialised (eg, by a boot loader), | |
1249 | * try to determine the current setup. | |
1250 | */ | |
1251 | static void __init | |
1252 | imx_console_get_options(struct imx_port *sport, int *baud, | |
1253 | int *parity, int *bits) | |
1254 | { | |
587897f5 | 1255 | |
2e2eb509 | 1256 | if (readl(sport->port.membase + UCR1) & UCR1_UARTEN) { |
1da177e4 LT |
1257 | /* ok, the port was enabled */ |
1258 | unsigned int ucr2, ubir,ubmr, uartclk; | |
587897f5 SH |
1259 | unsigned int baud_raw; |
1260 | unsigned int ucfr_rfdiv; | |
1da177e4 | 1261 | |
ff4bfb21 | 1262 | ucr2 = readl(sport->port.membase + UCR2); |
1da177e4 LT |
1263 | |
1264 | *parity = 'n'; | |
1265 | if (ucr2 & UCR2_PREN) { | |
1266 | if (ucr2 & UCR2_PROE) | |
1267 | *parity = 'o'; | |
1268 | else | |
1269 | *parity = 'e'; | |
1270 | } | |
1271 | ||
1272 | if (ucr2 & UCR2_WS) | |
1273 | *bits = 8; | |
1274 | else | |
1275 | *bits = 7; | |
1276 | ||
ff4bfb21 SH |
1277 | ubir = readl(sport->port.membase + UBIR) & 0xffff; |
1278 | ubmr = readl(sport->port.membase + UBMR) & 0xffff; | |
587897f5 | 1279 | |
ff4bfb21 | 1280 | ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7; |
587897f5 SH |
1281 | if (ucfr_rfdiv == 6) |
1282 | ucfr_rfdiv = 7; | |
1283 | else | |
1284 | ucfr_rfdiv = 6 - ucfr_rfdiv; | |
1285 | ||
3a9465fa | 1286 | uartclk = clk_get_rate(sport->clk_per); |
587897f5 SH |
1287 | uartclk /= ucfr_rfdiv; |
1288 | ||
1289 | { /* | |
1290 | * The next code provides exact computation of | |
1291 | * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1)) | |
1292 | * without need of float support or long long division, | |
1293 | * which would be required to prevent 32bit arithmetic overflow | |
1294 | */ | |
1295 | unsigned int mul = ubir + 1; | |
1296 | unsigned int div = 16 * (ubmr + 1); | |
1297 | unsigned int rem = uartclk % div; | |
1298 | ||
1299 | baud_raw = (uartclk / div) * mul; | |
1300 | baud_raw += (rem * mul + div / 2) / div; | |
1301 | *baud = (baud_raw + 50) / 100 * 100; | |
1302 | } | |
1303 | ||
1304 | if(*baud != baud_raw) | |
1305 | printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n", | |
1306 | baud_raw, *baud); | |
1da177e4 LT |
1307 | } |
1308 | } | |
1309 | ||
1310 | static int __init | |
1311 | imx_console_setup(struct console *co, char *options) | |
1312 | { | |
1313 | struct imx_port *sport; | |
1314 | int baud = 9600; | |
1315 | int bits = 8; | |
1316 | int parity = 'n'; | |
1317 | int flow = 'n'; | |
1318 | ||
1319 | /* | |
1320 | * Check whether an invalid uart number has been specified, and | |
1321 | * if so, search for the first available port that does have | |
1322 | * console support. | |
1323 | */ | |
1324 | if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports)) | |
1325 | co->index = 0; | |
dbff4e9e | 1326 | sport = imx_ports[co->index]; |
e76afc4e EL |
1327 | if(sport == NULL) |
1328 | return -ENODEV; | |
1da177e4 LT |
1329 | |
1330 | if (options) | |
1331 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1332 | else | |
1333 | imx_console_get_options(sport, &baud, &parity, &bits); | |
1334 | ||
587897f5 SH |
1335 | imx_setup_ufcr(sport, 0); |
1336 | ||
1da177e4 LT |
1337 | return uart_set_options(&sport->port, co, baud, parity, bits, flow); |
1338 | } | |
1339 | ||
9f4426dd | 1340 | static struct uart_driver imx_reg; |
1da177e4 | 1341 | static struct console imx_console = { |
e3d13ff4 | 1342 | .name = DEV_NAME, |
1da177e4 LT |
1343 | .write = imx_console_write, |
1344 | .device = uart_console_device, | |
1345 | .setup = imx_console_setup, | |
1346 | .flags = CON_PRINTBUFFER, | |
1347 | .index = -1, | |
1348 | .data = &imx_reg, | |
1349 | }; | |
1350 | ||
1da177e4 LT |
1351 | #define IMX_CONSOLE &imx_console |
1352 | #else | |
1353 | #define IMX_CONSOLE NULL | |
1354 | #endif | |
1355 | ||
1356 | static struct uart_driver imx_reg = { | |
1357 | .owner = THIS_MODULE, | |
1358 | .driver_name = DRIVER_NAME, | |
e3d13ff4 | 1359 | .dev_name = DEV_NAME, |
1da177e4 LT |
1360 | .major = SERIAL_IMX_MAJOR, |
1361 | .minor = MINOR_START, | |
1362 | .nr = ARRAY_SIZE(imx_ports), | |
1363 | .cons = IMX_CONSOLE, | |
1364 | }; | |
1365 | ||
3ae5eaec | 1366 | static int serial_imx_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 1367 | { |
d3810cd4 | 1368 | struct imx_port *sport = platform_get_drvdata(dev); |
db1a9b55 FE |
1369 | unsigned int val; |
1370 | ||
1371 | /* enable wakeup from i.MX UART */ | |
1372 | val = readl(sport->port.membase + UCR3); | |
1373 | val |= UCR3_AWAKEN; | |
1374 | writel(val, sport->port.membase + UCR3); | |
1da177e4 | 1375 | |
d3810cd4 OS |
1376 | if (sport) |
1377 | uart_suspend_port(&imx_reg, &sport->port); | |
1da177e4 | 1378 | |
d3810cd4 | 1379 | return 0; |
1da177e4 LT |
1380 | } |
1381 | ||
3ae5eaec | 1382 | static int serial_imx_resume(struct platform_device *dev) |
1da177e4 | 1383 | { |
d3810cd4 | 1384 | struct imx_port *sport = platform_get_drvdata(dev); |
db1a9b55 FE |
1385 | unsigned int val; |
1386 | ||
1387 | /* disable wakeup from i.MX UART */ | |
1388 | val = readl(sport->port.membase + UCR3); | |
1389 | val &= ~UCR3_AWAKEN; | |
1390 | writel(val, sport->port.membase + UCR3); | |
1da177e4 | 1391 | |
d3810cd4 OS |
1392 | if (sport) |
1393 | uart_resume_port(&imx_reg, &sport->port); | |
1da177e4 | 1394 | |
d3810cd4 | 1395 | return 0; |
1da177e4 LT |
1396 | } |
1397 | ||
22698aa2 | 1398 | #ifdef CONFIG_OF |
20bb8095 UKK |
1399 | /* |
1400 | * This function returns 1 iff pdev isn't a device instatiated by dt, 0 iff it | |
1401 | * could successfully get all information from dt or a negative errno. | |
1402 | */ | |
22698aa2 SG |
1403 | static int serial_imx_probe_dt(struct imx_port *sport, |
1404 | struct platform_device *pdev) | |
1405 | { | |
1406 | struct device_node *np = pdev->dev.of_node; | |
1407 | const struct of_device_id *of_id = | |
1408 | of_match_device(imx_uart_dt_ids, &pdev->dev); | |
ff05967a | 1409 | int ret; |
22698aa2 SG |
1410 | |
1411 | if (!np) | |
20bb8095 UKK |
1412 | /* no device tree device */ |
1413 | return 1; | |
22698aa2 | 1414 | |
ff05967a SG |
1415 | ret = of_alias_get_id(np, "serial"); |
1416 | if (ret < 0) { | |
1417 | dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); | |
a197a191 | 1418 | return ret; |
ff05967a SG |
1419 | } |
1420 | sport->port.line = ret; | |
22698aa2 SG |
1421 | |
1422 | if (of_get_property(np, "fsl,uart-has-rtscts", NULL)) | |
1423 | sport->have_rtscts = 1; | |
1424 | ||
1425 | if (of_get_property(np, "fsl,irda-mode", NULL)) | |
1426 | sport->use_irda = 1; | |
1427 | ||
1428 | sport->devdata = of_id->data; | |
1429 | ||
1430 | return 0; | |
1431 | } | |
1432 | #else | |
1433 | static inline int serial_imx_probe_dt(struct imx_port *sport, | |
1434 | struct platform_device *pdev) | |
1435 | { | |
20bb8095 | 1436 | return 1; |
22698aa2 SG |
1437 | } |
1438 | #endif | |
1439 | ||
1440 | static void serial_imx_probe_pdata(struct imx_port *sport, | |
1441 | struct platform_device *pdev) | |
1442 | { | |
1443 | struct imxuart_platform_data *pdata = pdev->dev.platform_data; | |
1444 | ||
1445 | sport->port.line = pdev->id; | |
1446 | sport->devdata = (struct imx_uart_data *) pdev->id_entry->driver_data; | |
1447 | ||
1448 | if (!pdata) | |
1449 | return; | |
1450 | ||
1451 | if (pdata->flags & IMXUART_HAVE_RTSCTS) | |
1452 | sport->have_rtscts = 1; | |
1453 | ||
1454 | if (pdata->flags & IMXUART_IRDA) | |
1455 | sport->use_irda = 1; | |
1456 | } | |
1457 | ||
2582d8c1 | 1458 | static int serial_imx_probe(struct platform_device *pdev) |
1da177e4 | 1459 | { |
dbff4e9e | 1460 | struct imx_port *sport; |
5b802344 | 1461 | struct imxuart_platform_data *pdata; |
dbff4e9e SH |
1462 | void __iomem *base; |
1463 | int ret = 0; | |
1464 | struct resource *res; | |
fed78ce4 | 1465 | struct pinctrl *pinctrl; |
dbff4e9e SH |
1466 | |
1467 | sport = kzalloc(sizeof(*sport), GFP_KERNEL); | |
1468 | if (!sport) | |
1469 | return -ENOMEM; | |
5b802344 | 1470 | |
22698aa2 | 1471 | ret = serial_imx_probe_dt(sport, pdev); |
20bb8095 | 1472 | if (ret > 0) |
22698aa2 | 1473 | serial_imx_probe_pdata(sport, pdev); |
20bb8095 UKK |
1474 | else if (ret < 0) |
1475 | goto free; | |
22698aa2 | 1476 | |
dbff4e9e SH |
1477 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
1478 | if (!res) { | |
1479 | ret = -ENODEV; | |
1480 | goto free; | |
1481 | } | |
1482 | ||
1483 | base = ioremap(res->start, PAGE_SIZE); | |
1484 | if (!base) { | |
1485 | ret = -ENOMEM; | |
1486 | goto free; | |
1487 | } | |
1488 | ||
1489 | sport->port.dev = &pdev->dev; | |
1490 | sport->port.mapbase = res->start; | |
1491 | sport->port.membase = base; | |
1492 | sport->port.type = PORT_IMX, | |
1493 | sport->port.iotype = UPIO_MEM; | |
1494 | sport->port.irq = platform_get_irq(pdev, 0); | |
1495 | sport->rxirq = platform_get_irq(pdev, 0); | |
1496 | sport->txirq = platform_get_irq(pdev, 1); | |
1497 | sport->rtsirq = platform_get_irq(pdev, 2); | |
1498 | sport->port.fifosize = 32; | |
1499 | sport->port.ops = &imx_pops; | |
1500 | sport->port.flags = UPF_BOOT_AUTOCONF; | |
dbff4e9e SH |
1501 | init_timer(&sport->timer); |
1502 | sport->timer.function = imx_timeout; | |
1503 | sport->timer.data = (unsigned long)sport; | |
38a41fdf | 1504 | |
fed78ce4 SG |
1505 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
1506 | if (IS_ERR(pinctrl)) { | |
1507 | ret = PTR_ERR(pinctrl); | |
833462e9 | 1508 | dev_err(&pdev->dev, "failed to get default pinctrl: %d\n", ret); |
fed78ce4 SG |
1509 | goto unmap; |
1510 | } | |
1511 | ||
3a9465fa SH |
1512 | sport->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); |
1513 | if (IS_ERR(sport->clk_ipg)) { | |
1514 | ret = PTR_ERR(sport->clk_ipg); | |
833462e9 | 1515 | dev_err(&pdev->dev, "failed to get ipg clk: %d\n", ret); |
38a41fdf SH |
1516 | goto unmap; |
1517 | } | |
38a41fdf | 1518 | |
3a9465fa SH |
1519 | sport->clk_per = devm_clk_get(&pdev->dev, "per"); |
1520 | if (IS_ERR(sport->clk_per)) { | |
1521 | ret = PTR_ERR(sport->clk_per); | |
833462e9 | 1522 | dev_err(&pdev->dev, "failed to get per clk: %d\n", ret); |
3a9465fa SH |
1523 | goto unmap; |
1524 | } | |
1525 | ||
1526 | clk_prepare_enable(sport->clk_per); | |
1527 | clk_prepare_enable(sport->clk_ipg); | |
1528 | ||
1529 | sport->port.uartclk = clk_get_rate(sport->clk_per); | |
dbff4e9e | 1530 | |
22698aa2 | 1531 | imx_ports[sport->port.line] = sport; |
5b802344 | 1532 | |
2582d8c1 | 1533 | pdata = pdev->dev.platform_data; |
bbcd18d1 | 1534 | if (pdata && pdata->init) { |
c45e7d7b DA |
1535 | ret = pdata->init(pdev); |
1536 | if (ret) | |
1537 | goto clkput; | |
1538 | } | |
2582d8c1 | 1539 | |
9f322ad0 DG |
1540 | ret = uart_add_one_port(&imx_reg, &sport->port); |
1541 | if (ret) | |
1542 | goto deinit; | |
dbff4e9e | 1543 | platform_set_drvdata(pdev, &sport->port); |
5b802344 | 1544 | |
1da177e4 | 1545 | return 0; |
9f322ad0 | 1546 | deinit: |
bbcd18d1 | 1547 | if (pdata && pdata->exit) |
9f322ad0 | 1548 | pdata->exit(pdev); |
c45e7d7b | 1549 | clkput: |
3a9465fa SH |
1550 | clk_disable_unprepare(sport->clk_per); |
1551 | clk_disable_unprepare(sport->clk_ipg); | |
38a41fdf SH |
1552 | unmap: |
1553 | iounmap(sport->port.membase); | |
dbff4e9e SH |
1554 | free: |
1555 | kfree(sport); | |
1556 | ||
1557 | return ret; | |
1da177e4 LT |
1558 | } |
1559 | ||
2582d8c1 | 1560 | static int serial_imx_remove(struct platform_device *pdev) |
1da177e4 | 1561 | { |
2582d8c1 SH |
1562 | struct imxuart_platform_data *pdata; |
1563 | struct imx_port *sport = platform_get_drvdata(pdev); | |
1da177e4 | 1564 | |
2582d8c1 SH |
1565 | pdata = pdev->dev.platform_data; |
1566 | ||
1567 | platform_set_drvdata(pdev, NULL); | |
1da177e4 | 1568 | |
3a9465fa SH |
1569 | uart_remove_one_port(&imx_reg, &sport->port); |
1570 | ||
1571 | clk_disable_unprepare(sport->clk_per); | |
1572 | clk_disable_unprepare(sport->clk_ipg); | |
38a41fdf | 1573 | |
bbcd18d1 | 1574 | if (pdata && pdata->exit) |
2582d8c1 SH |
1575 | pdata->exit(pdev); |
1576 | ||
dbff4e9e SH |
1577 | iounmap(sport->port.membase); |
1578 | kfree(sport); | |
1579 | ||
1da177e4 LT |
1580 | return 0; |
1581 | } | |
1582 | ||
3ae5eaec | 1583 | static struct platform_driver serial_imx_driver = { |
d3810cd4 OS |
1584 | .probe = serial_imx_probe, |
1585 | .remove = serial_imx_remove, | |
1da177e4 LT |
1586 | |
1587 | .suspend = serial_imx_suspend, | |
1588 | .resume = serial_imx_resume, | |
fe6b540a | 1589 | .id_table = imx_uart_devtype, |
3ae5eaec | 1590 | .driver = { |
d3810cd4 | 1591 | .name = "imx-uart", |
e169c139 | 1592 | .owner = THIS_MODULE, |
22698aa2 | 1593 | .of_match_table = imx_uart_dt_ids, |
3ae5eaec | 1594 | }, |
1da177e4 LT |
1595 | }; |
1596 | ||
1597 | static int __init imx_serial_init(void) | |
1598 | { | |
1599 | int ret; | |
1600 | ||
1601 | printk(KERN_INFO "Serial: IMX driver\n"); | |
1602 | ||
1da177e4 LT |
1603 | ret = uart_register_driver(&imx_reg); |
1604 | if (ret) | |
1605 | return ret; | |
1606 | ||
3ae5eaec | 1607 | ret = platform_driver_register(&serial_imx_driver); |
1da177e4 LT |
1608 | if (ret != 0) |
1609 | uart_unregister_driver(&imx_reg); | |
1610 | ||
f227824e | 1611 | return ret; |
1da177e4 LT |
1612 | } |
1613 | ||
1614 | static void __exit imx_serial_exit(void) | |
1615 | { | |
c889b896 | 1616 | platform_driver_unregister(&serial_imx_driver); |
4b300c36 | 1617 | uart_unregister_driver(&imx_reg); |
1da177e4 LT |
1618 | } |
1619 | ||
1620 | module_init(imx_serial_init); | |
1621 | module_exit(imx_serial_exit); | |
1622 | ||
1623 | MODULE_AUTHOR("Sascha Hauer"); | |
1624 | MODULE_DESCRIPTION("IMX generic serial port driver"); | |
1625 | MODULE_LICENSE("GPL"); | |
e169c139 | 1626 | MODULE_ALIAS("platform:imx-uart"); |