Commit | Line | Data |
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1da177e4 | 1 | /* |
f890cef2 | 2 | * Driver for Motorola/Freescale IMX serial ports |
1da177e4 | 3 | * |
f890cef2 | 4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
1da177e4 | 5 | * |
f890cef2 UKK |
6 | * Author: Sascha Hauer <sascha@saschahauer.de> |
7 | * Copyright (C) 2004 Pengutronix | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
1da177e4 | 18 | */ |
1da177e4 LT |
19 | |
20 | #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
21 | #define SUPPORT_SYSRQ | |
22 | #endif | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/console.h> | |
28 | #include <linux/sysrq.h> | |
d052d1be | 29 | #include <linux/platform_device.h> |
1da177e4 LT |
30 | #include <linux/tty.h> |
31 | #include <linux/tty_flip.h> | |
32 | #include <linux/serial_core.h> | |
33 | #include <linux/serial.h> | |
38a41fdf | 34 | #include <linux/clk.h> |
b6e49138 | 35 | #include <linux/delay.h> |
534fca06 | 36 | #include <linux/rational.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
22698aa2 SG |
38 | #include <linux/of.h> |
39 | #include <linux/of_device.h> | |
e32a9f8f | 40 | #include <linux/io.h> |
b4cdc8f6 | 41 | #include <linux/dma-mapping.h> |
1da177e4 | 42 | |
1da177e4 | 43 | #include <asm/irq.h> |
82906b13 | 44 | #include <linux/platform_data/serial-imx.h> |
b4cdc8f6 | 45 | #include <linux/platform_data/dma-imx.h> |
1da177e4 | 46 | |
ff4bfb21 SH |
47 | /* Register definitions */ |
48 | #define URXD0 0x0 /* Receiver Register */ | |
49 | #define URTX0 0x40 /* Transmitter Register */ | |
50 | #define UCR1 0x80 /* Control Register 1 */ | |
51 | #define UCR2 0x84 /* Control Register 2 */ | |
52 | #define UCR3 0x88 /* Control Register 3 */ | |
53 | #define UCR4 0x8c /* Control Register 4 */ | |
54 | #define UFCR 0x90 /* FIFO Control Register */ | |
55 | #define USR1 0x94 /* Status Register 1 */ | |
56 | #define USR2 0x98 /* Status Register 2 */ | |
57 | #define UESC 0x9c /* Escape Character Register */ | |
58 | #define UTIM 0xa0 /* Escape Timer Register */ | |
59 | #define UBIR 0xa4 /* BRM Incremental Register */ | |
60 | #define UBMR 0xa8 /* BRM Modulator Register */ | |
61 | #define UBRC 0xac /* Baud Rate Count Register */ | |
fe6b540a SG |
62 | #define IMX21_ONEMS 0xb0 /* One Millisecond register */ |
63 | #define IMX1_UTS 0xd0 /* UART Test Register on i.mx1 */ | |
64 | #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/ | |
ff4bfb21 SH |
65 | |
66 | /* UART Control Register Bit Fields.*/ | |
55d8693a | 67 | #define URXD_DUMMY_READ (1<<16) |
82313e66 SK |
68 | #define URXD_CHARRDY (1<<15) |
69 | #define URXD_ERR (1<<14) | |
70 | #define URXD_OVRRUN (1<<13) | |
71 | #define URXD_FRMERR (1<<12) | |
72 | #define URXD_BRK (1<<11) | |
73 | #define URXD_PRERR (1<<10) | |
26c47412 | 74 | #define URXD_RX_DATA (0xFF<<0) |
82313e66 SK |
75 | #define UCR1_ADEN (1<<15) /* Auto detect interrupt */ |
76 | #define UCR1_ADBR (1<<14) /* Auto detect baud rate */ | |
77 | #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */ | |
78 | #define UCR1_IDEN (1<<12) /* Idle condition interrupt */ | |
b4cdc8f6 | 79 | #define UCR1_ICD_REG(x) (((x) & 3) << 10) /* idle condition detect */ |
82313e66 SK |
80 | #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */ |
81 | #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */ | |
82 | #define UCR1_IREN (1<<7) /* Infrared interface enable */ | |
83 | #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */ | |
84 | #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */ | |
85 | #define UCR1_SNDBRK (1<<4) /* Send break */ | |
86 | #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */ | |
87 | #define IMX1_UCR1_UARTCLKEN (1<<2) /* UART clock enabled, i.mx1 only */ | |
b4cdc8f6 | 88 | #define UCR1_ATDMAEN (1<<2) /* Aging DMA Timer Enable */ |
82313e66 SK |
89 | #define UCR1_DOZE (1<<1) /* Doze */ |
90 | #define UCR1_UARTEN (1<<0) /* UART enabled */ | |
91 | #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */ | |
92 | #define UCR2_IRTS (1<<14) /* Ignore RTS pin */ | |
93 | #define UCR2_CTSC (1<<13) /* CTS pin control */ | |
94 | #define UCR2_CTS (1<<12) /* Clear to send */ | |
95 | #define UCR2_ESCEN (1<<11) /* Escape enable */ | |
96 | #define UCR2_PREN (1<<8) /* Parity enable */ | |
97 | #define UCR2_PROE (1<<7) /* Parity odd/even */ | |
98 | #define UCR2_STPB (1<<6) /* Stop */ | |
99 | #define UCR2_WS (1<<5) /* Word size */ | |
100 | #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */ | |
101 | #define UCR2_ATEN (1<<3) /* Aging Timer Enable */ | |
102 | #define UCR2_TXEN (1<<2) /* Transmitter enabled */ | |
103 | #define UCR2_RXEN (1<<1) /* Receiver enabled */ | |
104 | #define UCR2_SRST (1<<0) /* SW reset */ | |
105 | #define UCR3_DTREN (1<<13) /* DTR interrupt enable */ | |
106 | #define UCR3_PARERREN (1<<12) /* Parity enable */ | |
107 | #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */ | |
108 | #define UCR3_DSR (1<<10) /* Data set ready */ | |
109 | #define UCR3_DCD (1<<9) /* Data carrier detect */ | |
110 | #define UCR3_RI (1<<8) /* Ring indicator */ | |
b38cb7d2 | 111 | #define UCR3_ADNIMP (1<<7) /* Autobaud Detection Not Improved */ |
82313e66 SK |
112 | #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */ |
113 | #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */ | |
114 | #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */ | |
115 | #define IMX21_UCR3_RXDMUXSEL (1<<2) /* RXD Muxed Input Select */ | |
116 | #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */ | |
117 | #define UCR3_BPEN (1<<0) /* Preset registers enable */ | |
118 | #define UCR4_CTSTL_SHF 10 /* CTS trigger level shift */ | |
119 | #define UCR4_CTSTL_MASK 0x3F /* CTS trigger is 6 bits wide */ | |
120 | #define UCR4_INVR (1<<9) /* Inverted infrared reception */ | |
121 | #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */ | |
122 | #define UCR4_WKEN (1<<7) /* Wake interrupt enable */ | |
123 | #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */ | |
b4cdc8f6 | 124 | #define UCR4_IDDMAEN (1<<6) /* DMA IDLE Condition Detected */ |
82313e66 SK |
125 | #define UCR4_IRSC (1<<5) /* IR special case */ |
126 | #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */ | |
127 | #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */ | |
128 | #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */ | |
129 | #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */ | |
130 | #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */ | |
131 | #define UFCR_DCEDTE (1<<6) /* DCE/DTE mode select */ | |
132 | #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */ | |
133 | #define UFCR_RFDIV_REG(x) (((x) < 7 ? 6 - (x) : 6) << 7) | |
134 | #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */ | |
135 | #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */ | |
136 | #define USR1_RTSS (1<<14) /* RTS pin status */ | |
137 | #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */ | |
138 | #define USR1_RTSD (1<<12) /* RTS delta */ | |
139 | #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */ | |
140 | #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */ | |
141 | #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */ | |
86a04ba6 | 142 | #define USR1_AGTIM (1<<8) /* Ageing timer interrupt flag */ |
82313e66 SK |
143 | #define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */ |
144 | #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */ | |
145 | #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */ | |
146 | #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */ | |
147 | #define USR2_ADET (1<<15) /* Auto baud rate detect complete */ | |
148 | #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */ | |
149 | #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */ | |
150 | #define USR2_IDLE (1<<12) /* Idle condition */ | |
151 | #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */ | |
152 | #define USR2_WAKE (1<<7) /* Wake */ | |
153 | #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */ | |
154 | #define USR2_TXDC (1<<3) /* Transmitter complete */ | |
155 | #define USR2_BRCD (1<<2) /* Break condition */ | |
156 | #define USR2_ORE (1<<1) /* Overrun error */ | |
157 | #define USR2_RDR (1<<0) /* Recv data ready */ | |
158 | #define UTS_FRCPERR (1<<13) /* Force parity error */ | |
159 | #define UTS_LOOP (1<<12) /* Loop tx and rx */ | |
160 | #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */ | |
161 | #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */ | |
162 | #define UTS_TXFULL (1<<4) /* TxFIFO full */ | |
163 | #define UTS_RXFULL (1<<3) /* RxFIFO full */ | |
164 | #define UTS_SOFTRST (1<<0) /* Software reset */ | |
ff4bfb21 | 165 | |
1da177e4 | 166 | /* We've been assigned a range on the "Low-density serial ports" major */ |
82313e66 SK |
167 | #define SERIAL_IMX_MAJOR 207 |
168 | #define MINOR_START 16 | |
e3d13ff4 | 169 | #define DEV_NAME "ttymxc" |
1da177e4 | 170 | |
1da177e4 LT |
171 | /* |
172 | * This determines how often we check the modem status signals | |
173 | * for any change. They generally aren't connected to an IRQ | |
174 | * so we have to poll them. We also check immediately before | |
175 | * filling the TX fifo incase CTS has been dropped. | |
176 | */ | |
177 | #define MCTRL_TIMEOUT (250*HZ/1000) | |
178 | ||
179 | #define DRIVER_NAME "IMX-uart" | |
180 | ||
dbff4e9e SH |
181 | #define UART_NR 8 |
182 | ||
f95661b2 | 183 | /* i.MX21 type uart runs on all i.mx except i.MX1 and i.MX6q */ |
fe6b540a SG |
184 | enum imx_uart_type { |
185 | IMX1_UART, | |
186 | IMX21_UART, | |
a496e628 | 187 | IMX6Q_UART, |
fe6b540a SG |
188 | }; |
189 | ||
190 | /* device type dependent stuff */ | |
191 | struct imx_uart_data { | |
192 | unsigned uts_reg; | |
193 | enum imx_uart_type devtype; | |
194 | }; | |
195 | ||
1da177e4 LT |
196 | struct imx_port { |
197 | struct uart_port port; | |
198 | struct timer_list timer; | |
199 | unsigned int old_status; | |
26bbb3ff | 200 | unsigned int have_rtscts:1; |
20ff2fe6 | 201 | unsigned int dte_mode:1; |
b6e49138 FG |
202 | unsigned int irda_inv_rx:1; |
203 | unsigned int irda_inv_tx:1; | |
204 | unsigned short trcv_delay; /* transceiver delay */ | |
3a9465fa SH |
205 | struct clk *clk_ipg; |
206 | struct clk *clk_per; | |
7d0b066f | 207 | const struct imx_uart_data *devdata; |
b4cdc8f6 HS |
208 | |
209 | /* DMA fields */ | |
210 | unsigned int dma_is_inited:1; | |
211 | unsigned int dma_is_enabled:1; | |
212 | unsigned int dma_is_rxing:1; | |
213 | unsigned int dma_is_txing:1; | |
214 | struct dma_chan *dma_chan_rx, *dma_chan_tx; | |
215 | struct scatterlist rx_sgl, tx_sgl[2]; | |
216 | void *rx_buf; | |
7cb92fd2 | 217 | unsigned int tx_bytes; |
b4cdc8f6 | 218 | unsigned int dma_tx_nents; |
9ce4f8f3 | 219 | wait_queue_head_t dma_wait; |
90bb6bd3 | 220 | unsigned int saved_reg[10]; |
c868cbb7 | 221 | bool context_saved; |
1da177e4 LT |
222 | }; |
223 | ||
0ad5a814 DB |
224 | struct imx_port_ucrs { |
225 | unsigned int ucr1; | |
226 | unsigned int ucr2; | |
227 | unsigned int ucr3; | |
228 | }; | |
229 | ||
fe6b540a SG |
230 | static struct imx_uart_data imx_uart_devdata[] = { |
231 | [IMX1_UART] = { | |
232 | .uts_reg = IMX1_UTS, | |
233 | .devtype = IMX1_UART, | |
234 | }, | |
235 | [IMX21_UART] = { | |
236 | .uts_reg = IMX21_UTS, | |
237 | .devtype = IMX21_UART, | |
238 | }, | |
a496e628 HS |
239 | [IMX6Q_UART] = { |
240 | .uts_reg = IMX21_UTS, | |
241 | .devtype = IMX6Q_UART, | |
242 | }, | |
fe6b540a SG |
243 | }; |
244 | ||
31ada047 | 245 | static const struct platform_device_id imx_uart_devtype[] = { |
fe6b540a SG |
246 | { |
247 | .name = "imx1-uart", | |
248 | .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX1_UART], | |
249 | }, { | |
250 | .name = "imx21-uart", | |
251 | .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX21_UART], | |
a496e628 HS |
252 | }, { |
253 | .name = "imx6q-uart", | |
254 | .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX6Q_UART], | |
fe6b540a SG |
255 | }, { |
256 | /* sentinel */ | |
257 | } | |
258 | }; | |
259 | MODULE_DEVICE_TABLE(platform, imx_uart_devtype); | |
260 | ||
ad3d4fdc | 261 | static const struct of_device_id imx_uart_dt_ids[] = { |
a496e628 | 262 | { .compatible = "fsl,imx6q-uart", .data = &imx_uart_devdata[IMX6Q_UART], }, |
22698aa2 SG |
263 | { .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], }, |
264 | { .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], }, | |
265 | { /* sentinel */ } | |
266 | }; | |
267 | MODULE_DEVICE_TABLE(of, imx_uart_dt_ids); | |
268 | ||
fe6b540a SG |
269 | static inline unsigned uts_reg(struct imx_port *sport) |
270 | { | |
271 | return sport->devdata->uts_reg; | |
272 | } | |
273 | ||
274 | static inline int is_imx1_uart(struct imx_port *sport) | |
275 | { | |
276 | return sport->devdata->devtype == IMX1_UART; | |
277 | } | |
278 | ||
279 | static inline int is_imx21_uart(struct imx_port *sport) | |
280 | { | |
281 | return sport->devdata->devtype == IMX21_UART; | |
282 | } | |
283 | ||
a496e628 HS |
284 | static inline int is_imx6q_uart(struct imx_port *sport) |
285 | { | |
286 | return sport->devdata->devtype == IMX6Q_UART; | |
287 | } | |
44a75411 | 288 | /* |
289 | * Save and restore functions for UCR1, UCR2 and UCR3 registers | |
290 | */ | |
93d94b37 | 291 | #if defined(CONFIG_SERIAL_IMX_CONSOLE) |
44a75411 | 292 | static void imx_port_ucrs_save(struct uart_port *port, |
293 | struct imx_port_ucrs *ucr) | |
294 | { | |
295 | /* save control registers */ | |
296 | ucr->ucr1 = readl(port->membase + UCR1); | |
297 | ucr->ucr2 = readl(port->membase + UCR2); | |
298 | ucr->ucr3 = readl(port->membase + UCR3); | |
299 | } | |
300 | ||
301 | static void imx_port_ucrs_restore(struct uart_port *port, | |
302 | struct imx_port_ucrs *ucr) | |
303 | { | |
304 | /* restore control registers */ | |
305 | writel(ucr->ucr1, port->membase + UCR1); | |
306 | writel(ucr->ucr2, port->membase + UCR2); | |
307 | writel(ucr->ucr3, port->membase + UCR3); | |
308 | } | |
e8bfa760 | 309 | #endif |
44a75411 | 310 | |
1da177e4 LT |
311 | /* |
312 | * Handle any change of modem status signal since we were last called. | |
313 | */ | |
314 | static void imx_mctrl_check(struct imx_port *sport) | |
315 | { | |
316 | unsigned int status, changed; | |
317 | ||
318 | status = sport->port.ops->get_mctrl(&sport->port); | |
319 | changed = status ^ sport->old_status; | |
320 | ||
321 | if (changed == 0) | |
322 | return; | |
323 | ||
324 | sport->old_status = status; | |
325 | ||
326 | if (changed & TIOCM_RI) | |
327 | sport->port.icount.rng++; | |
328 | if (changed & TIOCM_DSR) | |
329 | sport->port.icount.dsr++; | |
330 | if (changed & TIOCM_CAR) | |
331 | uart_handle_dcd_change(&sport->port, status & TIOCM_CAR); | |
332 | if (changed & TIOCM_CTS) | |
333 | uart_handle_cts_change(&sport->port, status & TIOCM_CTS); | |
334 | ||
bdc04e31 | 335 | wake_up_interruptible(&sport->port.state->port.delta_msr_wait); |
1da177e4 LT |
336 | } |
337 | ||
338 | /* | |
339 | * This is our per-port timeout handler, for checking the | |
340 | * modem status signals. | |
341 | */ | |
342 | static void imx_timeout(unsigned long data) | |
343 | { | |
344 | struct imx_port *sport = (struct imx_port *)data; | |
345 | unsigned long flags; | |
346 | ||
ebd2c8f6 | 347 | if (sport->port.state) { |
1da177e4 LT |
348 | spin_lock_irqsave(&sport->port.lock, flags); |
349 | imx_mctrl_check(sport); | |
350 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
351 | ||
352 | mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT); | |
353 | } | |
354 | } | |
355 | ||
356 | /* | |
357 | * interrupts disabled on entry | |
358 | */ | |
b129a8cc | 359 | static void imx_stop_tx(struct uart_port *port) |
1da177e4 LT |
360 | { |
361 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 SH |
362 | unsigned long temp; |
363 | ||
9ce4f8f3 GKH |
364 | /* |
365 | * We are maybe in the SMP context, so if the DMA TX thread is running | |
366 | * on other cpu, we have to wait for it to finish. | |
367 | */ | |
368 | if (sport->dma_is_enabled && sport->dma_is_txing) | |
369 | return; | |
b4cdc8f6 | 370 | |
17b8f2a3 UKK |
371 | temp = readl(port->membase + UCR1); |
372 | writel(temp & ~UCR1_TXMPTYEN, port->membase + UCR1); | |
373 | ||
374 | /* in rs485 mode disable transmitter if shifter is empty */ | |
375 | if (port->rs485.flags & SER_RS485_ENABLED && | |
376 | readl(port->membase + USR2) & USR2_TXDC) { | |
377 | temp = readl(port->membase + UCR2); | |
378 | if (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) | |
379 | temp &= ~UCR2_CTS; | |
380 | else | |
381 | temp |= UCR2_CTS; | |
382 | writel(temp, port->membase + UCR2); | |
383 | ||
384 | temp = readl(port->membase + UCR4); | |
385 | temp &= ~UCR4_TCEN; | |
386 | writel(temp, port->membase + UCR4); | |
387 | } | |
1da177e4 LT |
388 | } |
389 | ||
390 | /* | |
391 | * interrupts disabled on entry | |
392 | */ | |
393 | static void imx_stop_rx(struct uart_port *port) | |
394 | { | |
395 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 SH |
396 | unsigned long temp; |
397 | ||
45564a66 HS |
398 | if (sport->dma_is_enabled && sport->dma_is_rxing) { |
399 | if (sport->port.suspended) { | |
400 | dmaengine_terminate_all(sport->dma_chan_rx); | |
401 | sport->dma_is_rxing = 0; | |
402 | } else { | |
403 | return; | |
404 | } | |
405 | } | |
b4cdc8f6 | 406 | |
ff4bfb21 | 407 | temp = readl(sport->port.membase + UCR2); |
82313e66 | 408 | writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2); |
85878399 HS |
409 | |
410 | /* disable the `Receiver Ready Interrrupt` */ | |
411 | temp = readl(sport->port.membase + UCR1); | |
412 | writel(temp & ~UCR1_RRDYEN, sport->port.membase + UCR1); | |
1da177e4 LT |
413 | } |
414 | ||
415 | /* | |
416 | * Set the modem control timer to fire immediately. | |
417 | */ | |
418 | static void imx_enable_ms(struct uart_port *port) | |
419 | { | |
420 | struct imx_port *sport = (struct imx_port *)port; | |
421 | ||
422 | mod_timer(&sport->timer, jiffies); | |
423 | } | |
424 | ||
91a1a909 | 425 | static void imx_dma_tx(struct imx_port *sport); |
1da177e4 LT |
426 | static inline void imx_transmit_buffer(struct imx_port *sport) |
427 | { | |
ebd2c8f6 | 428 | struct circ_buf *xmit = &sport->port.state->xmit; |
91a1a909 | 429 | unsigned long temp; |
1da177e4 | 430 | |
5e42e9a3 PH |
431 | if (sport->port.x_char) { |
432 | /* Send next char */ | |
433 | writel(sport->port.x_char, sport->port.membase + URTX0); | |
7e2fb5aa JW |
434 | sport->port.icount.tx++; |
435 | sport->port.x_char = 0; | |
5e42e9a3 PH |
436 | return; |
437 | } | |
438 | ||
439 | if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { | |
440 | imx_stop_tx(&sport->port); | |
441 | return; | |
442 | } | |
443 | ||
91a1a909 JW |
444 | if (sport->dma_is_enabled) { |
445 | /* | |
446 | * We've just sent a X-char Ensure the TX DMA is enabled | |
447 | * and the TX IRQ is disabled. | |
448 | **/ | |
449 | temp = readl(sport->port.membase + UCR1); | |
450 | temp &= ~UCR1_TXMPTYEN; | |
451 | if (sport->dma_is_txing) { | |
452 | temp |= UCR1_TDMAEN; | |
453 | writel(temp, sport->port.membase + UCR1); | |
454 | } else { | |
455 | writel(temp, sport->port.membase + UCR1); | |
456 | imx_dma_tx(sport); | |
457 | } | |
458 | } | |
459 | ||
4e4e6602 | 460 | while (!uart_circ_empty(xmit) && |
5e42e9a3 | 461 | !(readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL)) { |
1da177e4 LT |
462 | /* send xmit->buf[xmit->tail] |
463 | * out the port here */ | |
ff4bfb21 | 464 | writel(xmit->buf[xmit->tail], sport->port.membase + URTX0); |
d3810cd4 | 465 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
1da177e4 | 466 | sport->port.icount.tx++; |
8c0b254b | 467 | } |
1da177e4 | 468 | |
97775731 FG |
469 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
470 | uart_write_wakeup(&sport->port); | |
471 | ||
1da177e4 | 472 | if (uart_circ_empty(xmit)) |
b129a8cc | 473 | imx_stop_tx(&sport->port); |
1da177e4 LT |
474 | } |
475 | ||
b4cdc8f6 HS |
476 | static void dma_tx_callback(void *data) |
477 | { | |
478 | struct imx_port *sport = data; | |
479 | struct scatterlist *sgl = &sport->tx_sgl[0]; | |
480 | struct circ_buf *xmit = &sport->port.state->xmit; | |
481 | unsigned long flags; | |
a2c718ce | 482 | unsigned long temp; |
b4cdc8f6 | 483 | |
42f752b3 | 484 | spin_lock_irqsave(&sport->port.lock, flags); |
b4cdc8f6 | 485 | |
42f752b3 | 486 | dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); |
b4cdc8f6 | 487 | |
a2c718ce DB |
488 | temp = readl(sport->port.membase + UCR1); |
489 | temp &= ~UCR1_TDMAEN; | |
490 | writel(temp, sport->port.membase + UCR1); | |
491 | ||
b4cdc8f6 | 492 | /* update the stat */ |
b4cdc8f6 HS |
493 | xmit->tail = (xmit->tail + sport->tx_bytes) & (UART_XMIT_SIZE - 1); |
494 | sport->port.icount.tx += sport->tx_bytes; | |
b4cdc8f6 HS |
495 | |
496 | dev_dbg(sport->port.dev, "we finish the TX DMA.\n"); | |
497 | ||
42f752b3 DB |
498 | sport->dma_is_txing = 0; |
499 | ||
500 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
501 | ||
d64b8607 JW |
502 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
503 | uart_write_wakeup(&sport->port); | |
9ce4f8f3 GKH |
504 | |
505 | if (waitqueue_active(&sport->dma_wait)) { | |
506 | wake_up(&sport->dma_wait); | |
507 | dev_dbg(sport->port.dev, "exit in %s.\n", __func__); | |
508 | return; | |
509 | } | |
0bbc9b81 JW |
510 | |
511 | spin_lock_irqsave(&sport->port.lock, flags); | |
512 | if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port)) | |
513 | imx_dma_tx(sport); | |
514 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
b4cdc8f6 HS |
515 | } |
516 | ||
7cb92fd2 | 517 | static void imx_dma_tx(struct imx_port *sport) |
b4cdc8f6 | 518 | { |
b4cdc8f6 HS |
519 | struct circ_buf *xmit = &sport->port.state->xmit; |
520 | struct scatterlist *sgl = sport->tx_sgl; | |
521 | struct dma_async_tx_descriptor *desc; | |
522 | struct dma_chan *chan = sport->dma_chan_tx; | |
523 | struct device *dev = sport->port.dev; | |
a2c718ce | 524 | unsigned long temp; |
b4cdc8f6 HS |
525 | int ret; |
526 | ||
42f752b3 | 527 | if (sport->dma_is_txing) |
b4cdc8f6 HS |
528 | return; |
529 | ||
b4cdc8f6 | 530 | sport->tx_bytes = uart_circ_chars_pending(xmit); |
b4cdc8f6 | 531 | |
7942f857 DB |
532 | if (xmit->tail < xmit->head) { |
533 | sport->dma_tx_nents = 1; | |
534 | sg_init_one(sgl, xmit->buf + xmit->tail, sport->tx_bytes); | |
535 | } else { | |
b4cdc8f6 HS |
536 | sport->dma_tx_nents = 2; |
537 | sg_init_table(sgl, 2); | |
538 | sg_set_buf(sgl, xmit->buf + xmit->tail, | |
539 | UART_XMIT_SIZE - xmit->tail); | |
540 | sg_set_buf(sgl + 1, xmit->buf, xmit->head); | |
b4cdc8f6 | 541 | } |
b4cdc8f6 HS |
542 | |
543 | ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); | |
544 | if (ret == 0) { | |
545 | dev_err(dev, "DMA mapping error for TX.\n"); | |
546 | return; | |
547 | } | |
548 | desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents, | |
549 | DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); | |
550 | if (!desc) { | |
24649821 DB |
551 | dma_unmap_sg(dev, sgl, sport->dma_tx_nents, |
552 | DMA_TO_DEVICE); | |
b4cdc8f6 HS |
553 | dev_err(dev, "We cannot prepare for the TX slave dma!\n"); |
554 | return; | |
555 | } | |
556 | desc->callback = dma_tx_callback; | |
557 | desc->callback_param = sport; | |
558 | ||
559 | dev_dbg(dev, "TX: prepare to send %lu bytes by DMA.\n", | |
560 | uart_circ_chars_pending(xmit)); | |
a2c718ce DB |
561 | |
562 | temp = readl(sport->port.membase + UCR1); | |
563 | temp |= UCR1_TDMAEN; | |
564 | writel(temp, sport->port.membase + UCR1); | |
565 | ||
b4cdc8f6 HS |
566 | /* fire it */ |
567 | sport->dma_is_txing = 1; | |
568 | dmaengine_submit(desc); | |
569 | dma_async_issue_pending(chan); | |
570 | return; | |
571 | } | |
572 | ||
1da177e4 LT |
573 | /* |
574 | * interrupts disabled on entry | |
575 | */ | |
b129a8cc | 576 | static void imx_start_tx(struct uart_port *port) |
1da177e4 LT |
577 | { |
578 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 | 579 | unsigned long temp; |
1da177e4 | 580 | |
17b8f2a3 UKK |
581 | if (port->rs485.flags & SER_RS485_ENABLED) { |
582 | /* enable transmitter and shifter empty irq */ | |
583 | temp = readl(port->membase + UCR2); | |
584 | if (port->rs485.flags & SER_RS485_RTS_ON_SEND) | |
585 | temp &= ~UCR2_CTS; | |
586 | else | |
587 | temp |= UCR2_CTS; | |
588 | writel(temp, port->membase + UCR2); | |
589 | ||
590 | temp = readl(port->membase + UCR4); | |
591 | temp |= UCR4_TCEN; | |
592 | writel(temp, port->membase + UCR4); | |
593 | } | |
594 | ||
b4cdc8f6 HS |
595 | if (!sport->dma_is_enabled) { |
596 | temp = readl(sport->port.membase + UCR1); | |
597 | writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1); | |
598 | } | |
1da177e4 | 599 | |
b4cdc8f6 | 600 | if (sport->dma_is_enabled) { |
91a1a909 JW |
601 | if (sport->port.x_char) { |
602 | /* We have X-char to send, so enable TX IRQ and | |
603 | * disable TX DMA to let TX interrupt to send X-char */ | |
604 | temp = readl(sport->port.membase + UCR1); | |
605 | temp &= ~UCR1_TDMAEN; | |
606 | temp |= UCR1_TXMPTYEN; | |
607 | writel(temp, sport->port.membase + UCR1); | |
608 | return; | |
609 | } | |
610 | ||
5e42e9a3 PH |
611 | if (!uart_circ_empty(&port->state->xmit) && |
612 | !uart_tx_stopped(port)) | |
613 | imx_dma_tx(sport); | |
b4cdc8f6 HS |
614 | return; |
615 | } | |
1da177e4 LT |
616 | } |
617 | ||
7d12e780 | 618 | static irqreturn_t imx_rtsint(int irq, void *dev_id) |
ceca629e | 619 | { |
15aafa2f | 620 | struct imx_port *sport = dev_id; |
5680e941 | 621 | unsigned int val; |
ceca629e SH |
622 | unsigned long flags; |
623 | ||
624 | spin_lock_irqsave(&sport->port.lock, flags); | |
625 | ||
ff4bfb21 | 626 | writel(USR1_RTSD, sport->port.membase + USR1); |
5680e941 | 627 | val = readl(sport->port.membase + USR1) & USR1_RTSS; |
ceca629e | 628 | uart_handle_cts_change(&sport->port, !!val); |
bdc04e31 | 629 | wake_up_interruptible(&sport->port.state->port.delta_msr_wait); |
ceca629e SH |
630 | |
631 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
632 | return IRQ_HANDLED; | |
633 | } | |
634 | ||
7d12e780 | 635 | static irqreturn_t imx_txint(int irq, void *dev_id) |
1da177e4 | 636 | { |
15aafa2f | 637 | struct imx_port *sport = dev_id; |
1da177e4 LT |
638 | unsigned long flags; |
639 | ||
82313e66 | 640 | spin_lock_irqsave(&sport->port.lock, flags); |
1da177e4 | 641 | imx_transmit_buffer(sport); |
82313e66 | 642 | spin_unlock_irqrestore(&sport->port.lock, flags); |
1da177e4 LT |
643 | return IRQ_HANDLED; |
644 | } | |
645 | ||
7d12e780 | 646 | static irqreturn_t imx_rxint(int irq, void *dev_id) |
1da177e4 LT |
647 | { |
648 | struct imx_port *sport = dev_id; | |
82313e66 | 649 | unsigned int rx, flg, ignored = 0; |
92a19f9c | 650 | struct tty_port *port = &sport->port.state->port; |
ff4bfb21 | 651 | unsigned long flags, temp; |
1da177e4 | 652 | |
82313e66 | 653 | spin_lock_irqsave(&sport->port.lock, flags); |
1da177e4 | 654 | |
0d3c3938 | 655 | while (readl(sport->port.membase + USR2) & USR2_RDR) { |
1da177e4 LT |
656 | flg = TTY_NORMAL; |
657 | sport->port.icount.rx++; | |
658 | ||
0d3c3938 SH |
659 | rx = readl(sport->port.membase + URXD0); |
660 | ||
ff4bfb21 | 661 | temp = readl(sport->port.membase + USR2); |
864eeed0 | 662 | if (temp & USR2_BRCD) { |
94d32f99 | 663 | writel(USR2_BRCD, sport->port.membase + USR2); |
864eeed0 SH |
664 | if (uart_handle_break(&sport->port)) |
665 | continue; | |
1da177e4 LT |
666 | } |
667 | ||
d3810cd4 | 668 | if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx)) |
864eeed0 SH |
669 | continue; |
670 | ||
019dc9ea HW |
671 | if (unlikely(rx & URXD_ERR)) { |
672 | if (rx & URXD_BRK) | |
673 | sport->port.icount.brk++; | |
674 | else if (rx & URXD_PRERR) | |
864eeed0 SH |
675 | sport->port.icount.parity++; |
676 | else if (rx & URXD_FRMERR) | |
677 | sport->port.icount.frame++; | |
678 | if (rx & URXD_OVRRUN) | |
679 | sport->port.icount.overrun++; | |
680 | ||
681 | if (rx & sport->port.ignore_status_mask) { | |
682 | if (++ignored > 100) | |
683 | goto out; | |
684 | continue; | |
685 | } | |
686 | ||
8d267fd9 | 687 | rx &= (sport->port.read_status_mask | 0xFF); |
864eeed0 | 688 | |
019dc9ea HW |
689 | if (rx & URXD_BRK) |
690 | flg = TTY_BREAK; | |
691 | else if (rx & URXD_PRERR) | |
864eeed0 SH |
692 | flg = TTY_PARITY; |
693 | else if (rx & URXD_FRMERR) | |
694 | flg = TTY_FRAME; | |
695 | if (rx & URXD_OVRRUN) | |
696 | flg = TTY_OVERRUN; | |
1da177e4 | 697 | |
864eeed0 SH |
698 | #ifdef SUPPORT_SYSRQ |
699 | sport->port.sysrq = 0; | |
700 | #endif | |
701 | } | |
1da177e4 | 702 | |
55d8693a JW |
703 | if (sport->port.ignore_status_mask & URXD_DUMMY_READ) |
704 | goto out; | |
705 | ||
9b289932 MS |
706 | if (tty_insert_flip_char(port, rx, flg) == 0) |
707 | sport->port.icount.buf_overrun++; | |
864eeed0 | 708 | } |
1da177e4 LT |
709 | |
710 | out: | |
82313e66 | 711 | spin_unlock_irqrestore(&sport->port.lock, flags); |
2e124b4a | 712 | tty_flip_buffer_push(port); |
1da177e4 | 713 | return IRQ_HANDLED; |
1da177e4 LT |
714 | } |
715 | ||
7cb92fd2 | 716 | static int start_rx_dma(struct imx_port *sport); |
b4cdc8f6 HS |
717 | /* |
718 | * If the RXFIFO is filled with some data, and then we | |
719 | * arise a DMA operation to receive them. | |
720 | */ | |
721 | static void imx_dma_rxint(struct imx_port *sport) | |
722 | { | |
723 | unsigned long temp; | |
73631813 JW |
724 | unsigned long flags; |
725 | ||
726 | spin_lock_irqsave(&sport->port.lock, flags); | |
b4cdc8f6 HS |
727 | |
728 | temp = readl(sport->port.membase + USR2); | |
729 | if ((temp & USR2_RDR) && !sport->dma_is_rxing) { | |
730 | sport->dma_is_rxing = 1; | |
731 | ||
86a04ba6 | 732 | /* disable the receiver ready and aging timer interrupts */ |
b4cdc8f6 HS |
733 | temp = readl(sport->port.membase + UCR1); |
734 | temp &= ~(UCR1_RRDYEN); | |
735 | writel(temp, sport->port.membase + UCR1); | |
736 | ||
86a04ba6 LS |
737 | temp = readl(sport->port.membase + UCR2); |
738 | temp &= ~(UCR2_ATEN); | |
739 | writel(temp, sport->port.membase + UCR2); | |
740 | ||
b4cdc8f6 | 741 | /* tell the DMA to receive the data. */ |
7cb92fd2 | 742 | start_rx_dma(sport); |
b4cdc8f6 | 743 | } |
73631813 JW |
744 | |
745 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
b4cdc8f6 HS |
746 | } |
747 | ||
e3d13ff4 SH |
748 | static irqreturn_t imx_int(int irq, void *dev_id) |
749 | { | |
750 | struct imx_port *sport = dev_id; | |
751 | unsigned int sts; | |
f1f836e4 | 752 | unsigned int sts2; |
e3d13ff4 SH |
753 | |
754 | sts = readl(sport->port.membase + USR1); | |
17b8f2a3 | 755 | sts2 = readl(sport->port.membase + USR2); |
e3d13ff4 | 756 | |
86a04ba6 | 757 | if (sts & (USR1_RRDY | USR1_AGTIM)) { |
b4cdc8f6 HS |
758 | if (sport->dma_is_enabled) |
759 | imx_dma_rxint(sport); | |
760 | else | |
761 | imx_rxint(irq, dev_id); | |
762 | } | |
e3d13ff4 | 763 | |
17b8f2a3 UKK |
764 | if ((sts & USR1_TRDY && |
765 | readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) || | |
766 | (sts2 & USR2_TXDC && | |
767 | readl(sport->port.membase + UCR4) & UCR4_TCEN)) | |
e3d13ff4 SH |
768 | imx_txint(irq, dev_id); |
769 | ||
9fbe6044 | 770 | if (sts & USR1_RTSD) |
e3d13ff4 SH |
771 | imx_rtsint(irq, dev_id); |
772 | ||
db1a9b55 FE |
773 | if (sts & USR1_AWAKE) |
774 | writel(USR1_AWAKE, sport->port.membase + USR1); | |
775 | ||
f1f836e4 | 776 | if (sts2 & USR2_ORE) { |
f1f836e4 | 777 | sport->port.icount.overrun++; |
91555ce9 | 778 | writel(USR2_ORE, sport->port.membase + USR2); |
f1f836e4 AS |
779 | } |
780 | ||
e3d13ff4 SH |
781 | return IRQ_HANDLED; |
782 | } | |
783 | ||
1da177e4 LT |
784 | /* |
785 | * Return TIOCSER_TEMT when transmitter is not busy. | |
786 | */ | |
787 | static unsigned int imx_tx_empty(struct uart_port *port) | |
788 | { | |
789 | struct imx_port *sport = (struct imx_port *)port; | |
1ce43e58 | 790 | unsigned int ret; |
1da177e4 | 791 | |
1ce43e58 | 792 | ret = (readl(sport->port.membase + USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0; |
1da177e4 | 793 | |
1ce43e58 HS |
794 | /* If the TX DMA is working, return 0. */ |
795 | if (sport->dma_is_enabled && sport->dma_is_txing) | |
796 | ret = 0; | |
797 | ||
798 | return ret; | |
1da177e4 LT |
799 | } |
800 | ||
0f302dc3 SH |
801 | /* |
802 | * We have a modem side uart, so the meanings of RTS and CTS are inverted. | |
803 | */ | |
1da177e4 LT |
804 | static unsigned int imx_get_mctrl(struct uart_port *port) |
805 | { | |
d3810cd4 OS |
806 | struct imx_port *sport = (struct imx_port *)port; |
807 | unsigned int tmp = TIOCM_DSR | TIOCM_CAR; | |
0f302dc3 | 808 | |
d3810cd4 OS |
809 | if (readl(sport->port.membase + USR1) & USR1_RTSS) |
810 | tmp |= TIOCM_CTS; | |
0f302dc3 | 811 | |
d3810cd4 OS |
812 | if (readl(sport->port.membase + UCR2) & UCR2_CTS) |
813 | tmp |= TIOCM_RTS; | |
0f302dc3 | 814 | |
6b471a98 HS |
815 | if (readl(sport->port.membase + uts_reg(sport)) & UTS_LOOP) |
816 | tmp |= TIOCM_LOOP; | |
817 | ||
d3810cd4 | 818 | return tmp; |
1da177e4 LT |
819 | } |
820 | ||
821 | static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
822 | { | |
d3810cd4 | 823 | struct imx_port *sport = (struct imx_port *)port; |
ff4bfb21 SH |
824 | unsigned long temp; |
825 | ||
17b8f2a3 UKK |
826 | if (!(port->rs485.flags & SER_RS485_ENABLED)) { |
827 | temp = readl(sport->port.membase + UCR2); | |
828 | temp &= ~(UCR2_CTS | UCR2_CTSC); | |
829 | if (mctrl & TIOCM_RTS) | |
830 | temp |= UCR2_CTS | UCR2_CTSC; | |
831 | writel(temp, sport->port.membase + UCR2); | |
832 | } | |
6b471a98 HS |
833 | |
834 | temp = readl(sport->port.membase + uts_reg(sport)) & ~UTS_LOOP; | |
835 | if (mctrl & TIOCM_LOOP) | |
836 | temp |= UTS_LOOP; | |
837 | writel(temp, sport->port.membase + uts_reg(sport)); | |
1da177e4 LT |
838 | } |
839 | ||
840 | /* | |
841 | * Interrupts always disabled. | |
842 | */ | |
843 | static void imx_break_ctl(struct uart_port *port, int break_state) | |
844 | { | |
845 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 | 846 | unsigned long flags, temp; |
1da177e4 LT |
847 | |
848 | spin_lock_irqsave(&sport->port.lock, flags); | |
849 | ||
ff4bfb21 SH |
850 | temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK; |
851 | ||
82313e66 | 852 | if (break_state != 0) |
ff4bfb21 SH |
853 | temp |= UCR1_SNDBRK; |
854 | ||
855 | writel(temp, sport->port.membase + UCR1); | |
1da177e4 LT |
856 | |
857 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
858 | } | |
859 | ||
b4cdc8f6 | 860 | #define RX_BUF_SIZE (PAGE_SIZE) |
b4cdc8f6 HS |
861 | static void imx_rx_dma_done(struct imx_port *sport) |
862 | { | |
863 | unsigned long temp; | |
73631813 JW |
864 | unsigned long flags; |
865 | ||
866 | spin_lock_irqsave(&sport->port.lock, flags); | |
b4cdc8f6 | 867 | |
86a04ba6 | 868 | /* re-enable interrupts to get notified when new symbols are incoming */ |
b4cdc8f6 HS |
869 | temp = readl(sport->port.membase + UCR1); |
870 | temp |= UCR1_RRDYEN; | |
871 | writel(temp, sport->port.membase + UCR1); | |
872 | ||
86a04ba6 LS |
873 | temp = readl(sport->port.membase + UCR2); |
874 | temp |= UCR2_ATEN; | |
875 | writel(temp, sport->port.membase + UCR2); | |
876 | ||
b4cdc8f6 | 877 | sport->dma_is_rxing = 0; |
9ce4f8f3 GKH |
878 | |
879 | /* Is the shutdown waiting for us? */ | |
880 | if (waitqueue_active(&sport->dma_wait)) | |
881 | wake_up(&sport->dma_wait); | |
73631813 JW |
882 | |
883 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
b4cdc8f6 HS |
884 | } |
885 | ||
886 | /* | |
905c0dec | 887 | * There are two kinds of RX DMA interrupts(such as in the MX6Q): |
b4cdc8f6 | 888 | * [1] the RX DMA buffer is full. |
905c0dec | 889 | * [2] the aging timer expires |
b4cdc8f6 | 890 | * |
905c0dec LS |
891 | * Condition [2] is triggered when a character has been sitting in the FIFO |
892 | * for at least 8 byte durations. | |
b4cdc8f6 HS |
893 | */ |
894 | static void dma_rx_callback(void *data) | |
895 | { | |
896 | struct imx_port *sport = data; | |
897 | struct dma_chan *chan = sport->dma_chan_rx; | |
898 | struct scatterlist *sgl = &sport->rx_sgl; | |
7cb92fd2 | 899 | struct tty_port *port = &sport->port.state->port; |
b4cdc8f6 HS |
900 | struct dma_tx_state state; |
901 | enum dma_status status; | |
902 | unsigned int count; | |
903 | ||
904 | /* unmap it first */ | |
905 | dma_unmap_sg(sport->port.dev, sgl, 1, DMA_FROM_DEVICE); | |
906 | ||
f0ef8834 | 907 | status = dmaengine_tx_status(chan, (dma_cookie_t)0, &state); |
b4cdc8f6 | 908 | count = RX_BUF_SIZE - state.residue; |
392bceed | 909 | |
b4cdc8f6 HS |
910 | dev_dbg(sport->port.dev, "We get %d bytes.\n", count); |
911 | ||
912 | if (count) { | |
9b289932 MS |
913 | if (!(sport->port.ignore_status_mask & URXD_DUMMY_READ)) { |
914 | int bytes = tty_insert_flip_string(port, sport->rx_buf, | |
915 | count); | |
916 | ||
917 | if (bytes != count) | |
918 | sport->port.icount.buf_overrun++; | |
919 | } | |
7cb92fd2 | 920 | tty_flip_buffer_push(port); |
abc7882a | 921 | sport->port.icount.rx += count; |
976b39cd | 922 | } |
7cb92fd2 | 923 | |
976b39cd LS |
924 | /* |
925 | * Restart RX DMA directly if more data is available in order to skip | |
926 | * the roundtrip through the IRQ handler. If there is some data already | |
927 | * in the FIFO, DMA needs to be restarted soon anyways. | |
928 | * | |
929 | * Otherwise stop the DMA and reactivate FIFO IRQs to restart DMA once | |
930 | * data starts to arrive again. | |
931 | */ | |
932 | if (readl(sport->port.membase + USR2) & USR2_RDR) | |
7cb92fd2 | 933 | start_rx_dma(sport); |
976b39cd | 934 | else |
b4cdc8f6 HS |
935 | imx_rx_dma_done(sport); |
936 | } | |
937 | ||
938 | static int start_rx_dma(struct imx_port *sport) | |
939 | { | |
940 | struct scatterlist *sgl = &sport->rx_sgl; | |
941 | struct dma_chan *chan = sport->dma_chan_rx; | |
942 | struct device *dev = sport->port.dev; | |
943 | struct dma_async_tx_descriptor *desc; | |
944 | int ret; | |
945 | ||
946 | sg_init_one(sgl, sport->rx_buf, RX_BUF_SIZE); | |
947 | ret = dma_map_sg(dev, sgl, 1, DMA_FROM_DEVICE); | |
948 | if (ret == 0) { | |
949 | dev_err(dev, "DMA mapping error for RX.\n"); | |
950 | return -EINVAL; | |
951 | } | |
952 | desc = dmaengine_prep_slave_sg(chan, sgl, 1, DMA_DEV_TO_MEM, | |
953 | DMA_PREP_INTERRUPT); | |
954 | if (!desc) { | |
24649821 | 955 | dma_unmap_sg(dev, sgl, 1, DMA_FROM_DEVICE); |
b4cdc8f6 HS |
956 | dev_err(dev, "We cannot prepare for the RX slave dma!\n"); |
957 | return -EINVAL; | |
958 | } | |
959 | desc->callback = dma_rx_callback; | |
960 | desc->callback_param = sport; | |
961 | ||
962 | dev_dbg(dev, "RX: prepare for the DMA.\n"); | |
963 | dmaengine_submit(desc); | |
964 | dma_async_issue_pending(chan); | |
965 | return 0; | |
966 | } | |
967 | ||
cc32382d LS |
968 | #define TXTL_DEFAULT 2 /* reset default */ |
969 | #define RXTL_DEFAULT 1 /* reset default */ | |
184bd70b LS |
970 | #define TXTL_DMA 8 /* DMA burst setting */ |
971 | #define RXTL_DMA 9 /* DMA burst setting */ | |
cc32382d LS |
972 | |
973 | static void imx_setup_ufcr(struct imx_port *sport, | |
974 | unsigned char txwl, unsigned char rxwl) | |
975 | { | |
976 | unsigned int val; | |
977 | ||
978 | /* set receiver / transmitter trigger level */ | |
979 | val = readl(sport->port.membase + UFCR) & (UFCR_RFDIV | UFCR_DCEDTE); | |
980 | val |= txwl << UFCR_TXTL_SHF | rxwl; | |
981 | writel(val, sport->port.membase + UFCR); | |
982 | } | |
983 | ||
b4cdc8f6 HS |
984 | static void imx_uart_dma_exit(struct imx_port *sport) |
985 | { | |
986 | if (sport->dma_chan_rx) { | |
987 | dma_release_channel(sport->dma_chan_rx); | |
988 | sport->dma_chan_rx = NULL; | |
989 | ||
990 | kfree(sport->rx_buf); | |
991 | sport->rx_buf = NULL; | |
992 | } | |
993 | ||
994 | if (sport->dma_chan_tx) { | |
995 | dma_release_channel(sport->dma_chan_tx); | |
996 | sport->dma_chan_tx = NULL; | |
997 | } | |
998 | ||
999 | sport->dma_is_inited = 0; | |
1000 | } | |
1001 | ||
1002 | static int imx_uart_dma_init(struct imx_port *sport) | |
1003 | { | |
b09c74ae | 1004 | struct dma_slave_config slave_config = {}; |
b4cdc8f6 HS |
1005 | struct device *dev = sport->port.dev; |
1006 | int ret; | |
1007 | ||
1008 | /* Prepare for RX : */ | |
1009 | sport->dma_chan_rx = dma_request_slave_channel(dev, "rx"); | |
1010 | if (!sport->dma_chan_rx) { | |
1011 | dev_dbg(dev, "cannot get the DMA channel.\n"); | |
1012 | ret = -EINVAL; | |
1013 | goto err; | |
1014 | } | |
1015 | ||
1016 | slave_config.direction = DMA_DEV_TO_MEM; | |
1017 | slave_config.src_addr = sport->port.mapbase + URXD0; | |
1018 | slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
184bd70b LS |
1019 | /* one byte less than the watermark level to enable the aging timer */ |
1020 | slave_config.src_maxburst = RXTL_DMA - 1; | |
b4cdc8f6 HS |
1021 | ret = dmaengine_slave_config(sport->dma_chan_rx, &slave_config); |
1022 | if (ret) { | |
1023 | dev_err(dev, "error in RX dma configuration.\n"); | |
1024 | goto err; | |
1025 | } | |
1026 | ||
1027 | sport->rx_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
1028 | if (!sport->rx_buf) { | |
b4cdc8f6 HS |
1029 | ret = -ENOMEM; |
1030 | goto err; | |
1031 | } | |
b4cdc8f6 HS |
1032 | |
1033 | /* Prepare for TX : */ | |
1034 | sport->dma_chan_tx = dma_request_slave_channel(dev, "tx"); | |
1035 | if (!sport->dma_chan_tx) { | |
1036 | dev_err(dev, "cannot get the TX DMA channel!\n"); | |
1037 | ret = -EINVAL; | |
1038 | goto err; | |
1039 | } | |
1040 | ||
1041 | slave_config.direction = DMA_MEM_TO_DEV; | |
1042 | slave_config.dst_addr = sport->port.mapbase + URTX0; | |
1043 | slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
184bd70b | 1044 | slave_config.dst_maxburst = TXTL_DMA; |
b4cdc8f6 HS |
1045 | ret = dmaengine_slave_config(sport->dma_chan_tx, &slave_config); |
1046 | if (ret) { | |
1047 | dev_err(dev, "error in TX dma configuration."); | |
1048 | goto err; | |
1049 | } | |
1050 | ||
1051 | sport->dma_is_inited = 1; | |
1052 | ||
1053 | return 0; | |
1054 | err: | |
1055 | imx_uart_dma_exit(sport); | |
1056 | return ret; | |
1057 | } | |
1058 | ||
1059 | static void imx_enable_dma(struct imx_port *sport) | |
1060 | { | |
1061 | unsigned long temp; | |
b4cdc8f6 | 1062 | |
9ce4f8f3 GKH |
1063 | init_waitqueue_head(&sport->dma_wait); |
1064 | ||
b4cdc8f6 HS |
1065 | /* set UCR1 */ |
1066 | temp = readl(sport->port.membase + UCR1); | |
905c0dec | 1067 | temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN; |
b4cdc8f6 HS |
1068 | writel(temp, sport->port.membase + UCR1); |
1069 | ||
86a04ba6 LS |
1070 | temp = readl(sport->port.membase + UCR2); |
1071 | temp |= UCR2_ATEN; | |
1072 | writel(temp, sport->port.membase + UCR2); | |
1073 | ||
184bd70b LS |
1074 | imx_setup_ufcr(sport, TXTL_DMA, RXTL_DMA); |
1075 | ||
b4cdc8f6 HS |
1076 | sport->dma_is_enabled = 1; |
1077 | } | |
1078 | ||
1079 | static void imx_disable_dma(struct imx_port *sport) | |
1080 | { | |
1081 | unsigned long temp; | |
b4cdc8f6 HS |
1082 | |
1083 | /* clear UCR1 */ | |
1084 | temp = readl(sport->port.membase + UCR1); | |
1085 | temp &= ~(UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN); | |
1086 | writel(temp, sport->port.membase + UCR1); | |
1087 | ||
1088 | /* clear UCR2 */ | |
1089 | temp = readl(sport->port.membase + UCR2); | |
86a04ba6 | 1090 | temp &= ~(UCR2_CTSC | UCR2_CTS | UCR2_ATEN); |
b4cdc8f6 HS |
1091 | writel(temp, sport->port.membase + UCR2); |
1092 | ||
184bd70b LS |
1093 | imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); |
1094 | ||
b4cdc8f6 | 1095 | sport->dma_is_enabled = 0; |
b4cdc8f6 HS |
1096 | } |
1097 | ||
1c5250d6 VL |
1098 | /* half the RX buffer size */ |
1099 | #define CTSTL 16 | |
1100 | ||
1da177e4 LT |
1101 | static int imx_startup(struct uart_port *port) |
1102 | { | |
1103 | struct imx_port *sport = (struct imx_port *)port; | |
458e2c82 | 1104 | int retval, i; |
ff4bfb21 | 1105 | unsigned long flags, temp; |
1da177e4 | 1106 | |
1cf93e0d HS |
1107 | retval = clk_prepare_enable(sport->clk_per); |
1108 | if (retval) | |
cb0f0a5f | 1109 | return retval; |
1cf93e0d HS |
1110 | retval = clk_prepare_enable(sport->clk_ipg); |
1111 | if (retval) { | |
1112 | clk_disable_unprepare(sport->clk_per); | |
cb0f0a5f | 1113 | return retval; |
0c375501 | 1114 | } |
28eb4274 | 1115 | |
cc32382d | 1116 | imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); |
1da177e4 LT |
1117 | |
1118 | /* disable the DREN bit (Data Ready interrupt enable) before | |
1119 | * requesting IRQs | |
1120 | */ | |
ff4bfb21 | 1121 | temp = readl(sport->port.membase + UCR4); |
b6e49138 | 1122 | |
1c5250d6 | 1123 | /* set the trigger level for CTS */ |
82313e66 SK |
1124 | temp &= ~(UCR4_CTSTL_MASK << UCR4_CTSTL_SHF); |
1125 | temp |= CTSTL << UCR4_CTSTL_SHF; | |
1c5250d6 | 1126 | |
ff4bfb21 | 1127 | writel(temp & ~UCR4_DREN, sport->port.membase + UCR4); |
1da177e4 | 1128 | |
7e11577e LS |
1129 | /* Can we enable the DMA support? */ |
1130 | if (is_imx6q_uart(sport) && !uart_console(port) && | |
1131 | !sport->dma_is_inited) | |
1132 | imx_uart_dma_init(sport); | |
1133 | ||
53794183 | 1134 | spin_lock_irqsave(&sport->port.lock, flags); |
772f8991 | 1135 | /* Reset fifo's and state machines */ |
458e2c82 FE |
1136 | i = 100; |
1137 | ||
1138 | temp = readl(sport->port.membase + UCR2); | |
1139 | temp &= ~UCR2_SRST; | |
1140 | writel(temp, sport->port.membase + UCR2); | |
1141 | ||
1142 | while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0)) | |
1143 | udelay(1); | |
b6e49138 | 1144 | |
1da177e4 LT |
1145 | /* |
1146 | * Finally, clear and enable interrupts | |
1147 | */ | |
ff4bfb21 | 1148 | writel(USR1_RTSD, sport->port.membase + USR1); |
91555ce9 | 1149 | writel(USR2_ORE, sport->port.membase + USR2); |
ff4bfb21 | 1150 | |
7e11577e LS |
1151 | if (sport->dma_is_inited && !sport->dma_is_enabled) |
1152 | imx_enable_dma(sport); | |
1153 | ||
ff4bfb21 | 1154 | temp = readl(sport->port.membase + UCR1); |
789d5258 | 1155 | temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN; |
b6e49138 | 1156 | |
ff4bfb21 | 1157 | writel(temp, sport->port.membase + UCR1); |
1da177e4 | 1158 | |
6f026d6b JW |
1159 | temp = readl(sport->port.membase + UCR4); |
1160 | temp |= UCR4_OREN; | |
1161 | writel(temp, sport->port.membase + UCR4); | |
1162 | ||
ff4bfb21 SH |
1163 | temp = readl(sport->port.membase + UCR2); |
1164 | temp |= (UCR2_RXEN | UCR2_TXEN); | |
bff09b09 LS |
1165 | if (!sport->have_rtscts) |
1166 | temp |= UCR2_IRTS; | |
ff4bfb21 | 1167 | writel(temp, sport->port.membase + UCR2); |
1da177e4 | 1168 | |
a496e628 | 1169 | if (!is_imx1_uart(sport)) { |
37d6fb62 | 1170 | temp = readl(sport->port.membase + UCR3); |
b38cb7d2 | 1171 | temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP; |
37d6fb62 SH |
1172 | writel(temp, sport->port.membase + UCR3); |
1173 | } | |
4411805b | 1174 | |
1da177e4 LT |
1175 | /* |
1176 | * Enable modem status interrupts | |
1177 | */ | |
1da177e4 | 1178 | imx_enable_ms(&sport->port); |
82313e66 | 1179 | spin_unlock_irqrestore(&sport->port.lock, flags); |
1da177e4 LT |
1180 | |
1181 | return 0; | |
1da177e4 LT |
1182 | } |
1183 | ||
1184 | static void imx_shutdown(struct uart_port *port) | |
1185 | { | |
1186 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 | 1187 | unsigned long temp; |
9ec1882d | 1188 | unsigned long flags; |
1da177e4 | 1189 | |
b4cdc8f6 | 1190 | if (sport->dma_is_enabled) { |
a4688bcd HS |
1191 | int ret; |
1192 | ||
9ce4f8f3 | 1193 | /* We have to wait for the DMA to finish. */ |
a4688bcd | 1194 | ret = wait_event_interruptible(sport->dma_wait, |
9ce4f8f3 | 1195 | !sport->dma_is_rxing && !sport->dma_is_txing); |
a4688bcd HS |
1196 | if (ret != 0) { |
1197 | sport->dma_is_rxing = 0; | |
1198 | sport->dma_is_txing = 0; | |
1199 | dmaengine_terminate_all(sport->dma_chan_tx); | |
1200 | dmaengine_terminate_all(sport->dma_chan_rx); | |
1201 | } | |
73631813 | 1202 | spin_lock_irqsave(&sport->port.lock, flags); |
a4688bcd | 1203 | imx_stop_tx(port); |
b4cdc8f6 HS |
1204 | imx_stop_rx(port); |
1205 | imx_disable_dma(sport); | |
73631813 | 1206 | spin_unlock_irqrestore(&sport->port.lock, flags); |
b4cdc8f6 HS |
1207 | imx_uart_dma_exit(sport); |
1208 | } | |
1209 | ||
9ec1882d | 1210 | spin_lock_irqsave(&sport->port.lock, flags); |
2e146392 FG |
1211 | temp = readl(sport->port.membase + UCR2); |
1212 | temp &= ~(UCR2_TXEN); | |
1213 | writel(temp, sport->port.membase + UCR2); | |
9ec1882d | 1214 | spin_unlock_irqrestore(&sport->port.lock, flags); |
2e146392 | 1215 | |
1da177e4 LT |
1216 | /* |
1217 | * Stop our timer. | |
1218 | */ | |
1219 | del_timer_sync(&sport->timer); | |
1220 | ||
1da177e4 LT |
1221 | /* |
1222 | * Disable all interrupts, port and break condition. | |
1223 | */ | |
1224 | ||
9ec1882d | 1225 | spin_lock_irqsave(&sport->port.lock, flags); |
ff4bfb21 SH |
1226 | temp = readl(sport->port.membase + UCR1); |
1227 | temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN); | |
b6e49138 | 1228 | |
ff4bfb21 | 1229 | writel(temp, sport->port.membase + UCR1); |
9ec1882d | 1230 | spin_unlock_irqrestore(&sport->port.lock, flags); |
28eb4274 | 1231 | |
1cf93e0d HS |
1232 | clk_disable_unprepare(sport->clk_per); |
1233 | clk_disable_unprepare(sport->clk_ipg); | |
1da177e4 LT |
1234 | } |
1235 | ||
eb56b7ed HS |
1236 | static void imx_flush_buffer(struct uart_port *port) |
1237 | { | |
1238 | struct imx_port *sport = (struct imx_port *)port; | |
82e86ae9 | 1239 | struct scatterlist *sgl = &sport->tx_sgl[0]; |
a2c718ce | 1240 | unsigned long temp; |
4f86a95d | 1241 | int i = 100, ubir, ubmr, uts; |
eb56b7ed | 1242 | |
82e86ae9 DB |
1243 | if (!sport->dma_chan_tx) |
1244 | return; | |
1245 | ||
1246 | sport->tx_bytes = 0; | |
1247 | dmaengine_terminate_all(sport->dma_chan_tx); | |
1248 | if (sport->dma_is_txing) { | |
1249 | dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, | |
1250 | DMA_TO_DEVICE); | |
a2c718ce DB |
1251 | temp = readl(sport->port.membase + UCR1); |
1252 | temp &= ~UCR1_TDMAEN; | |
1253 | writel(temp, sport->port.membase + UCR1); | |
82e86ae9 | 1254 | sport->dma_is_txing = false; |
eb56b7ed | 1255 | } |
934084a9 FE |
1256 | |
1257 | /* | |
1258 | * According to the Reference Manual description of the UART SRST bit: | |
1259 | * "Reset the transmit and receive state machines, | |
1260 | * all FIFOs and register USR1, USR2, UBIR, UBMR, UBRC, URXD, UTXD | |
1261 | * and UTS[6-3]". As we don't need to restore the old values from | |
1262 | * USR1, USR2, URXD, UTXD, only save/restore the other four registers | |
1263 | */ | |
1264 | ubir = readl(sport->port.membase + UBIR); | |
1265 | ubmr = readl(sport->port.membase + UBMR); | |
934084a9 FE |
1266 | uts = readl(sport->port.membase + IMX21_UTS); |
1267 | ||
1268 | temp = readl(sport->port.membase + UCR2); | |
1269 | temp &= ~UCR2_SRST; | |
1270 | writel(temp, sport->port.membase + UCR2); | |
1271 | ||
1272 | while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0)) | |
1273 | udelay(1); | |
1274 | ||
1275 | /* Restore the registers */ | |
1276 | writel(ubir, sport->port.membase + UBIR); | |
1277 | writel(ubmr, sport->port.membase + UBMR); | |
934084a9 | 1278 | writel(uts, sport->port.membase + IMX21_UTS); |
eb56b7ed HS |
1279 | } |
1280 | ||
1da177e4 | 1281 | static void |
606d099c AC |
1282 | imx_set_termios(struct uart_port *port, struct ktermios *termios, |
1283 | struct ktermios *old) | |
1da177e4 LT |
1284 | { |
1285 | struct imx_port *sport = (struct imx_port *)port; | |
1286 | unsigned long flags; | |
86a04ba6 | 1287 | unsigned int ucr2, old_ucr1, old_ucr2, baud, quot; |
1da177e4 | 1288 | unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; |
534fca06 OS |
1289 | unsigned int div, ufcr; |
1290 | unsigned long num, denom; | |
d7f8d437 | 1291 | uint64_t tdiv64; |
1da177e4 | 1292 | |
1da177e4 LT |
1293 | /* |
1294 | * We only support CS7 and CS8. | |
1295 | */ | |
1296 | while ((termios->c_cflag & CSIZE) != CS7 && | |
1297 | (termios->c_cflag & CSIZE) != CS8) { | |
1298 | termios->c_cflag &= ~CSIZE; | |
1299 | termios->c_cflag |= old_csize; | |
1300 | old_csize = CS8; | |
1301 | } | |
1302 | ||
1303 | if ((termios->c_cflag & CSIZE) == CS8) | |
1304 | ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS; | |
1305 | else | |
1306 | ucr2 = UCR2_SRST | UCR2_IRTS; | |
1307 | ||
1308 | if (termios->c_cflag & CRTSCTS) { | |
82313e66 | 1309 | if (sport->have_rtscts) { |
5b802344 | 1310 | ucr2 &= ~UCR2_IRTS; |
17b8f2a3 | 1311 | |
12fe59f9 | 1312 | if (port->rs485.flags & SER_RS485_ENABLED) { |
17b8f2a3 UKK |
1313 | /* |
1314 | * RTS is mandatory for rs485 operation, so keep | |
1315 | * it under manual control and keep transmitter | |
1316 | * disabled. | |
1317 | */ | |
1318 | if (!(port->rs485.flags & | |
1319 | SER_RS485_RTS_AFTER_SEND)) | |
1320 | ucr2 |= UCR2_CTS; | |
12fe59f9 | 1321 | } else { |
17b8f2a3 | 1322 | ucr2 |= UCR2_CTSC; |
12fe59f9 | 1323 | } |
5b802344 SH |
1324 | } else { |
1325 | termios->c_cflag &= ~CRTSCTS; | |
1326 | } | |
17b8f2a3 UKK |
1327 | } else if (port->rs485.flags & SER_RS485_ENABLED) |
1328 | /* disable transmitter */ | |
1329 | if (!(port->rs485.flags & SER_RS485_RTS_AFTER_SEND)) | |
1330 | ucr2 |= UCR2_CTS; | |
1da177e4 LT |
1331 | |
1332 | if (termios->c_cflag & CSTOPB) | |
1333 | ucr2 |= UCR2_STPB; | |
1334 | if (termios->c_cflag & PARENB) { | |
1335 | ucr2 |= UCR2_PREN; | |
3261e362 | 1336 | if (termios->c_cflag & PARODD) |
1da177e4 LT |
1337 | ucr2 |= UCR2_PROE; |
1338 | } | |
1339 | ||
995234da EM |
1340 | del_timer_sync(&sport->timer); |
1341 | ||
1da177e4 LT |
1342 | /* |
1343 | * Ask the core to calculate the divisor for us. | |
1344 | */ | |
036bb15e | 1345 | baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16); |
1da177e4 LT |
1346 | quot = uart_get_divisor(port, baud); |
1347 | ||
1348 | spin_lock_irqsave(&sport->port.lock, flags); | |
1349 | ||
1350 | sport->port.read_status_mask = 0; | |
1351 | if (termios->c_iflag & INPCK) | |
1352 | sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR); | |
1353 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
1354 | sport->port.read_status_mask |= URXD_BRK; | |
1355 | ||
1356 | /* | |
1357 | * Characters to ignore | |
1358 | */ | |
1359 | sport->port.ignore_status_mask = 0; | |
1360 | if (termios->c_iflag & IGNPAR) | |
865cea85 | 1361 | sport->port.ignore_status_mask |= URXD_PRERR | URXD_FRMERR; |
1da177e4 LT |
1362 | if (termios->c_iflag & IGNBRK) { |
1363 | sport->port.ignore_status_mask |= URXD_BRK; | |
1364 | /* | |
1365 | * If we're ignoring parity and break indicators, | |
1366 | * ignore overruns too (for real raw support). | |
1367 | */ | |
1368 | if (termios->c_iflag & IGNPAR) | |
1369 | sport->port.ignore_status_mask |= URXD_OVRRUN; | |
1370 | } | |
1371 | ||
55d8693a JW |
1372 | if ((termios->c_cflag & CREAD) == 0) |
1373 | sport->port.ignore_status_mask |= URXD_DUMMY_READ; | |
1374 | ||
1da177e4 LT |
1375 | /* |
1376 | * Update the per-port timeout. | |
1377 | */ | |
1378 | uart_update_timeout(port, termios->c_cflag, baud); | |
1379 | ||
1380 | /* | |
1381 | * disable interrupts and drain transmitter | |
1382 | */ | |
ff4bfb21 SH |
1383 | old_ucr1 = readl(sport->port.membase + UCR1); |
1384 | writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN), | |
1385 | sport->port.membase + UCR1); | |
1da177e4 | 1386 | |
82313e66 | 1387 | while (!(readl(sport->port.membase + USR2) & USR2_TXDC)) |
1da177e4 LT |
1388 | barrier(); |
1389 | ||
1390 | /* then, disable everything */ | |
86a04ba6 LS |
1391 | old_ucr2 = readl(sport->port.membase + UCR2); |
1392 | writel(old_ucr2 & ~(UCR2_TXEN | UCR2_RXEN), | |
ff4bfb21 | 1393 | sport->port.membase + UCR2); |
86a04ba6 | 1394 | old_ucr2 &= (UCR2_TXEN | UCR2_RXEN | UCR2_ATEN); |
1da177e4 | 1395 | |
afe9cbb1 UKK |
1396 | /* custom-baudrate handling */ |
1397 | div = sport->port.uartclk / (baud * 16); | |
1398 | if (baud == 38400 && quot != div) | |
1399 | baud = sport->port.uartclk / (quot * 16); | |
1400 | ||
1401 | div = sport->port.uartclk / (baud * 16); | |
1402 | if (div > 7) | |
1403 | div = 7; | |
1404 | if (!div) | |
036bb15e SH |
1405 | div = 1; |
1406 | ||
534fca06 OS |
1407 | rational_best_approximation(16 * div * baud, sport->port.uartclk, |
1408 | 1 << 16, 1 << 16, &num, &denom); | |
036bb15e | 1409 | |
eab4f5af AC |
1410 | tdiv64 = sport->port.uartclk; |
1411 | tdiv64 *= num; | |
1412 | do_div(tdiv64, denom * 16 * div); | |
1413 | tty_termios_encode_baud_rate(termios, | |
1a2c4b31 | 1414 | (speed_t)tdiv64, (speed_t)tdiv64); |
d7f8d437 | 1415 | |
534fca06 OS |
1416 | num -= 1; |
1417 | denom -= 1; | |
036bb15e SH |
1418 | |
1419 | ufcr = readl(sport->port.membase + UFCR); | |
b6e49138 | 1420 | ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div); |
20ff2fe6 HS |
1421 | if (sport->dte_mode) |
1422 | ufcr |= UFCR_DCEDTE; | |
036bb15e SH |
1423 | writel(ufcr, sport->port.membase + UFCR); |
1424 | ||
534fca06 OS |
1425 | writel(num, sport->port.membase + UBIR); |
1426 | writel(denom, sport->port.membase + UBMR); | |
1427 | ||
a496e628 | 1428 | if (!is_imx1_uart(sport)) |
37d6fb62 | 1429 | writel(sport->port.uartclk / div / 1000, |
fe6b540a | 1430 | sport->port.membase + IMX21_ONEMS); |
ff4bfb21 SH |
1431 | |
1432 | writel(old_ucr1, sport->port.membase + UCR1); | |
1da177e4 | 1433 | |
ff4bfb21 | 1434 | /* set the parity, stop bits and data size */ |
86a04ba6 | 1435 | writel(ucr2 | old_ucr2, sport->port.membase + UCR2); |
1da177e4 LT |
1436 | |
1437 | if (UART_ENABLE_MS(&sport->port, termios->c_cflag)) | |
1438 | imx_enable_ms(&sport->port); | |
1439 | ||
1440 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
1441 | } | |
1442 | ||
1443 | static const char *imx_type(struct uart_port *port) | |
1444 | { | |
1445 | struct imx_port *sport = (struct imx_port *)port; | |
1446 | ||
1447 | return sport->port.type == PORT_IMX ? "IMX" : NULL; | |
1448 | } | |
1449 | ||
1da177e4 LT |
1450 | /* |
1451 | * Configure/autoconfigure the port. | |
1452 | */ | |
1453 | static void imx_config_port(struct uart_port *port, int flags) | |
1454 | { | |
1455 | struct imx_port *sport = (struct imx_port *)port; | |
1456 | ||
da82f997 | 1457 | if (flags & UART_CONFIG_TYPE) |
1da177e4 LT |
1458 | sport->port.type = PORT_IMX; |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * Verify the new serial_struct (for TIOCSSERIAL). | |
1463 | * The only change we allow are to the flags and type, and | |
1464 | * even then only between PORT_IMX and PORT_UNKNOWN | |
1465 | */ | |
1466 | static int | |
1467 | imx_verify_port(struct uart_port *port, struct serial_struct *ser) | |
1468 | { | |
1469 | struct imx_port *sport = (struct imx_port *)port; | |
1470 | int ret = 0; | |
1471 | ||
1472 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX) | |
1473 | ret = -EINVAL; | |
1474 | if (sport->port.irq != ser->irq) | |
1475 | ret = -EINVAL; | |
1476 | if (ser->io_type != UPIO_MEM) | |
1477 | ret = -EINVAL; | |
1478 | if (sport->port.uartclk / 16 != ser->baud_base) | |
1479 | ret = -EINVAL; | |
a50c44ce | 1480 | if (sport->port.mapbase != (unsigned long)ser->iomem_base) |
1da177e4 LT |
1481 | ret = -EINVAL; |
1482 | if (sport->port.iobase != ser->port) | |
1483 | ret = -EINVAL; | |
1484 | if (ser->hub6 != 0) | |
1485 | ret = -EINVAL; | |
1486 | return ret; | |
1487 | } | |
1488 | ||
01f56abd | 1489 | #if defined(CONFIG_CONSOLE_POLL) |
6b8bdad9 DT |
1490 | |
1491 | static int imx_poll_init(struct uart_port *port) | |
1492 | { | |
1493 | struct imx_port *sport = (struct imx_port *)port; | |
1494 | unsigned long flags; | |
1495 | unsigned long temp; | |
1496 | int retval; | |
1497 | ||
1498 | retval = clk_prepare_enable(sport->clk_ipg); | |
1499 | if (retval) | |
1500 | return retval; | |
1501 | retval = clk_prepare_enable(sport->clk_per); | |
1502 | if (retval) | |
1503 | clk_disable_unprepare(sport->clk_ipg); | |
1504 | ||
cc32382d | 1505 | imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); |
6b8bdad9 DT |
1506 | |
1507 | spin_lock_irqsave(&sport->port.lock, flags); | |
1508 | ||
1509 | temp = readl(sport->port.membase + UCR1); | |
1510 | if (is_imx1_uart(sport)) | |
1511 | temp |= IMX1_UCR1_UARTCLKEN; | |
1512 | temp |= UCR1_UARTEN | UCR1_RRDYEN; | |
1513 | temp &= ~(UCR1_TXMPTYEN | UCR1_RTSDEN); | |
1514 | writel(temp, sport->port.membase + UCR1); | |
1515 | ||
1516 | temp = readl(sport->port.membase + UCR2); | |
1517 | temp |= UCR2_RXEN; | |
1518 | writel(temp, sport->port.membase + UCR2); | |
1519 | ||
1520 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
1521 | ||
1522 | return 0; | |
1523 | } | |
1524 | ||
01f56abd SA |
1525 | static int imx_poll_get_char(struct uart_port *port) |
1526 | { | |
f968ef34 | 1527 | if (!(readl_relaxed(port->membase + USR2) & USR2_RDR)) |
26c47412 | 1528 | return NO_POLL_CHAR; |
01f56abd | 1529 | |
f968ef34 | 1530 | return readl_relaxed(port->membase + URXD0) & URXD_RX_DATA; |
01f56abd SA |
1531 | } |
1532 | ||
1533 | static void imx_poll_put_char(struct uart_port *port, unsigned char c) | |
1534 | { | |
01f56abd SA |
1535 | unsigned int status; |
1536 | ||
01f56abd SA |
1537 | /* drain */ |
1538 | do { | |
f968ef34 | 1539 | status = readl_relaxed(port->membase + USR1); |
01f56abd SA |
1540 | } while (~status & USR1_TRDY); |
1541 | ||
1542 | /* write */ | |
f968ef34 | 1543 | writel_relaxed(c, port->membase + URTX0); |
01f56abd SA |
1544 | |
1545 | /* flush */ | |
1546 | do { | |
f968ef34 | 1547 | status = readl_relaxed(port->membase + USR2); |
01f56abd | 1548 | } while (~status & USR2_TXDC); |
01f56abd SA |
1549 | } |
1550 | #endif | |
1551 | ||
17b8f2a3 UKK |
1552 | static int imx_rs485_config(struct uart_port *port, |
1553 | struct serial_rs485 *rs485conf) | |
1554 | { | |
1555 | struct imx_port *sport = (struct imx_port *)port; | |
1556 | ||
1557 | /* unimplemented */ | |
1558 | rs485conf->delay_rts_before_send = 0; | |
1559 | rs485conf->delay_rts_after_send = 0; | |
1560 | rs485conf->flags |= SER_RS485_RX_DURING_TX; | |
1561 | ||
1562 | /* RTS is required to control the transmitter */ | |
1563 | if (!sport->have_rtscts) | |
1564 | rs485conf->flags &= ~SER_RS485_ENABLED; | |
1565 | ||
1566 | if (rs485conf->flags & SER_RS485_ENABLED) { | |
1567 | unsigned long temp; | |
1568 | ||
1569 | /* disable transmitter */ | |
1570 | temp = readl(sport->port.membase + UCR2); | |
1571 | temp &= ~UCR2_CTSC; | |
1572 | if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND) | |
1573 | temp &= ~UCR2_CTS; | |
1574 | else | |
1575 | temp |= UCR2_CTS; | |
1576 | writel(temp, sport->port.membase + UCR2); | |
1577 | } | |
1578 | ||
1579 | port->rs485 = *rs485conf; | |
1580 | ||
1581 | return 0; | |
1582 | } | |
1583 | ||
1da177e4 LT |
1584 | static struct uart_ops imx_pops = { |
1585 | .tx_empty = imx_tx_empty, | |
1586 | .set_mctrl = imx_set_mctrl, | |
1587 | .get_mctrl = imx_get_mctrl, | |
1588 | .stop_tx = imx_stop_tx, | |
1589 | .start_tx = imx_start_tx, | |
1590 | .stop_rx = imx_stop_rx, | |
1591 | .enable_ms = imx_enable_ms, | |
1592 | .break_ctl = imx_break_ctl, | |
1593 | .startup = imx_startup, | |
1594 | .shutdown = imx_shutdown, | |
eb56b7ed | 1595 | .flush_buffer = imx_flush_buffer, |
1da177e4 LT |
1596 | .set_termios = imx_set_termios, |
1597 | .type = imx_type, | |
1da177e4 LT |
1598 | .config_port = imx_config_port, |
1599 | .verify_port = imx_verify_port, | |
01f56abd | 1600 | #if defined(CONFIG_CONSOLE_POLL) |
6b8bdad9 | 1601 | .poll_init = imx_poll_init, |
01f56abd SA |
1602 | .poll_get_char = imx_poll_get_char, |
1603 | .poll_put_char = imx_poll_put_char, | |
1604 | #endif | |
1da177e4 LT |
1605 | }; |
1606 | ||
dbff4e9e | 1607 | static struct imx_port *imx_ports[UART_NR]; |
1da177e4 LT |
1608 | |
1609 | #ifdef CONFIG_SERIAL_IMX_CONSOLE | |
d358788f RK |
1610 | static void imx_console_putchar(struct uart_port *port, int ch) |
1611 | { | |
1612 | struct imx_port *sport = (struct imx_port *)port; | |
ff4bfb21 | 1613 | |
fe6b540a | 1614 | while (readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL) |
d358788f | 1615 | barrier(); |
ff4bfb21 SH |
1616 | |
1617 | writel(ch, sport->port.membase + URTX0); | |
d358788f | 1618 | } |
1da177e4 LT |
1619 | |
1620 | /* | |
1621 | * Interrupts are disabled on entering | |
1622 | */ | |
1623 | static void | |
1624 | imx_console_write(struct console *co, const char *s, unsigned int count) | |
1625 | { | |
dbff4e9e | 1626 | struct imx_port *sport = imx_ports[co->index]; |
0ad5a814 DB |
1627 | struct imx_port_ucrs old_ucr; |
1628 | unsigned int ucr1; | |
f30e8260 | 1629 | unsigned long flags = 0; |
677fe555 | 1630 | int locked = 1; |
1cf93e0d HS |
1631 | int retval; |
1632 | ||
9e7b399d | 1633 | retval = clk_prepare_enable(sport->clk_per); |
1cf93e0d HS |
1634 | if (retval) |
1635 | return; | |
9e7b399d | 1636 | retval = clk_prepare_enable(sport->clk_ipg); |
1cf93e0d | 1637 | if (retval) { |
9e7b399d | 1638 | clk_disable_unprepare(sport->clk_per); |
1cf93e0d HS |
1639 | return; |
1640 | } | |
9ec1882d | 1641 | |
677fe555 TG |
1642 | if (sport->port.sysrq) |
1643 | locked = 0; | |
1644 | else if (oops_in_progress) | |
1645 | locked = spin_trylock_irqsave(&sport->port.lock, flags); | |
1646 | else | |
1647 | spin_lock_irqsave(&sport->port.lock, flags); | |
1da177e4 LT |
1648 | |
1649 | /* | |
0ad5a814 | 1650 | * First, save UCR1/2/3 and then disable interrupts |
1da177e4 | 1651 | */ |
0ad5a814 DB |
1652 | imx_port_ucrs_save(&sport->port, &old_ucr); |
1653 | ucr1 = old_ucr.ucr1; | |
1da177e4 | 1654 | |
fe6b540a SG |
1655 | if (is_imx1_uart(sport)) |
1656 | ucr1 |= IMX1_UCR1_UARTCLKEN; | |
37d6fb62 SH |
1657 | ucr1 |= UCR1_UARTEN; |
1658 | ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN); | |
1659 | ||
1660 | writel(ucr1, sport->port.membase + UCR1); | |
ff4bfb21 | 1661 | |
0ad5a814 | 1662 | writel(old_ucr.ucr2 | UCR2_TXEN, sport->port.membase + UCR2); |
1da177e4 | 1663 | |
d358788f | 1664 | uart_console_write(&sport->port, s, count, imx_console_putchar); |
1da177e4 LT |
1665 | |
1666 | /* | |
1667 | * Finally, wait for transmitter to become empty | |
0ad5a814 | 1668 | * and restore UCR1/2/3 |
1da177e4 | 1669 | */ |
ff4bfb21 | 1670 | while (!(readl(sport->port.membase + USR2) & USR2_TXDC)); |
1da177e4 | 1671 | |
0ad5a814 | 1672 | imx_port_ucrs_restore(&sport->port, &old_ucr); |
9ec1882d | 1673 | |
677fe555 TG |
1674 | if (locked) |
1675 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
1cf93e0d | 1676 | |
9e7b399d EV |
1677 | clk_disable_unprepare(sport->clk_ipg); |
1678 | clk_disable_unprepare(sport->clk_per); | |
1da177e4 LT |
1679 | } |
1680 | ||
1681 | /* | |
1682 | * If the port was already initialised (eg, by a boot loader), | |
1683 | * try to determine the current setup. | |
1684 | */ | |
1685 | static void __init | |
1686 | imx_console_get_options(struct imx_port *sport, int *baud, | |
1687 | int *parity, int *bits) | |
1688 | { | |
587897f5 | 1689 | |
2e2eb509 | 1690 | if (readl(sport->port.membase + UCR1) & UCR1_UARTEN) { |
1da177e4 | 1691 | /* ok, the port was enabled */ |
82313e66 | 1692 | unsigned int ucr2, ubir, ubmr, uartclk; |
587897f5 SH |
1693 | unsigned int baud_raw; |
1694 | unsigned int ucfr_rfdiv; | |
1da177e4 | 1695 | |
ff4bfb21 | 1696 | ucr2 = readl(sport->port.membase + UCR2); |
1da177e4 LT |
1697 | |
1698 | *parity = 'n'; | |
1699 | if (ucr2 & UCR2_PREN) { | |
1700 | if (ucr2 & UCR2_PROE) | |
1701 | *parity = 'o'; | |
1702 | else | |
1703 | *parity = 'e'; | |
1704 | } | |
1705 | ||
1706 | if (ucr2 & UCR2_WS) | |
1707 | *bits = 8; | |
1708 | else | |
1709 | *bits = 7; | |
1710 | ||
ff4bfb21 SH |
1711 | ubir = readl(sport->port.membase + UBIR) & 0xffff; |
1712 | ubmr = readl(sport->port.membase + UBMR) & 0xffff; | |
587897f5 | 1713 | |
ff4bfb21 | 1714 | ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7; |
587897f5 SH |
1715 | if (ucfr_rfdiv == 6) |
1716 | ucfr_rfdiv = 7; | |
1717 | else | |
1718 | ucfr_rfdiv = 6 - ucfr_rfdiv; | |
1719 | ||
3a9465fa | 1720 | uartclk = clk_get_rate(sport->clk_per); |
587897f5 SH |
1721 | uartclk /= ucfr_rfdiv; |
1722 | ||
1723 | { /* | |
1724 | * The next code provides exact computation of | |
1725 | * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1)) | |
1726 | * without need of float support or long long division, | |
1727 | * which would be required to prevent 32bit arithmetic overflow | |
1728 | */ | |
1729 | unsigned int mul = ubir + 1; | |
1730 | unsigned int div = 16 * (ubmr + 1); | |
1731 | unsigned int rem = uartclk % div; | |
1732 | ||
1733 | baud_raw = (uartclk / div) * mul; | |
1734 | baud_raw += (rem * mul + div / 2) / div; | |
1735 | *baud = (baud_raw + 50) / 100 * 100; | |
1736 | } | |
1737 | ||
82313e66 | 1738 | if (*baud != baud_raw) |
50bbdba3 | 1739 | pr_info("Console IMX rounded baud rate from %d to %d\n", |
587897f5 | 1740 | baud_raw, *baud); |
1da177e4 LT |
1741 | } |
1742 | } | |
1743 | ||
1744 | static int __init | |
1745 | imx_console_setup(struct console *co, char *options) | |
1746 | { | |
1747 | struct imx_port *sport; | |
1748 | int baud = 9600; | |
1749 | int bits = 8; | |
1750 | int parity = 'n'; | |
1751 | int flow = 'n'; | |
1cf93e0d | 1752 | int retval; |
1da177e4 LT |
1753 | |
1754 | /* | |
1755 | * Check whether an invalid uart number has been specified, and | |
1756 | * if so, search for the first available port that does have | |
1757 | * console support. | |
1758 | */ | |
1759 | if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports)) | |
1760 | co->index = 0; | |
dbff4e9e | 1761 | sport = imx_ports[co->index]; |
82313e66 | 1762 | if (sport == NULL) |
e76afc4e | 1763 | return -ENODEV; |
1da177e4 | 1764 | |
1cf93e0d HS |
1765 | /* For setting the registers, we only need to enable the ipg clock. */ |
1766 | retval = clk_prepare_enable(sport->clk_ipg); | |
1767 | if (retval) | |
1768 | goto error_console; | |
1769 | ||
1da177e4 LT |
1770 | if (options) |
1771 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1772 | else | |
1773 | imx_console_get_options(sport, &baud, &parity, &bits); | |
1774 | ||
cc32382d | 1775 | imx_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); |
587897f5 | 1776 | |
1cf93e0d HS |
1777 | retval = uart_set_options(&sport->port, co, baud, parity, bits, flow); |
1778 | ||
9e7b399d | 1779 | clk_disable_unprepare(sport->clk_ipg); |
1cf93e0d HS |
1780 | |
1781 | error_console: | |
1782 | return retval; | |
1da177e4 LT |
1783 | } |
1784 | ||
9f4426dd | 1785 | static struct uart_driver imx_reg; |
1da177e4 | 1786 | static struct console imx_console = { |
e3d13ff4 | 1787 | .name = DEV_NAME, |
1da177e4 LT |
1788 | .write = imx_console_write, |
1789 | .device = uart_console_device, | |
1790 | .setup = imx_console_setup, | |
1791 | .flags = CON_PRINTBUFFER, | |
1792 | .index = -1, | |
1793 | .data = &imx_reg, | |
1794 | }; | |
1795 | ||
1da177e4 | 1796 | #define IMX_CONSOLE &imx_console |
913c6c0e LS |
1797 | |
1798 | #ifdef CONFIG_OF | |
1799 | static void imx_console_early_putchar(struct uart_port *port, int ch) | |
1800 | { | |
1801 | while (readl_relaxed(port->membase + IMX21_UTS) & UTS_TXFULL) | |
1802 | cpu_relax(); | |
1803 | ||
1804 | writel_relaxed(ch, port->membase + URTX0); | |
1805 | } | |
1806 | ||
1807 | static void imx_console_early_write(struct console *con, const char *s, | |
1808 | unsigned count) | |
1809 | { | |
1810 | struct earlycon_device *dev = con->data; | |
1811 | ||
1812 | uart_console_write(&dev->port, s, count, imx_console_early_putchar); | |
1813 | } | |
1814 | ||
1815 | static int __init | |
1816 | imx_console_early_setup(struct earlycon_device *dev, const char *opt) | |
1817 | { | |
1818 | if (!dev->port.membase) | |
1819 | return -ENODEV; | |
1820 | ||
1821 | dev->con->write = imx_console_early_write; | |
1822 | ||
1823 | return 0; | |
1824 | } | |
1825 | OF_EARLYCON_DECLARE(ec_imx6q, "fsl,imx6q-uart", imx_console_early_setup); | |
1826 | OF_EARLYCON_DECLARE(ec_imx21, "fsl,imx21-uart", imx_console_early_setup); | |
1827 | #endif | |
1828 | ||
1da177e4 LT |
1829 | #else |
1830 | #define IMX_CONSOLE NULL | |
1831 | #endif | |
1832 | ||
1833 | static struct uart_driver imx_reg = { | |
1834 | .owner = THIS_MODULE, | |
1835 | .driver_name = DRIVER_NAME, | |
e3d13ff4 | 1836 | .dev_name = DEV_NAME, |
1da177e4 LT |
1837 | .major = SERIAL_IMX_MAJOR, |
1838 | .minor = MINOR_START, | |
1839 | .nr = ARRAY_SIZE(imx_ports), | |
1840 | .cons = IMX_CONSOLE, | |
1841 | }; | |
1842 | ||
22698aa2 | 1843 | #ifdef CONFIG_OF |
20bb8095 UKK |
1844 | /* |
1845 | * This function returns 1 iff pdev isn't a device instatiated by dt, 0 iff it | |
1846 | * could successfully get all information from dt or a negative errno. | |
1847 | */ | |
22698aa2 SG |
1848 | static int serial_imx_probe_dt(struct imx_port *sport, |
1849 | struct platform_device *pdev) | |
1850 | { | |
1851 | struct device_node *np = pdev->dev.of_node; | |
1852 | const struct of_device_id *of_id = | |
1853 | of_match_device(imx_uart_dt_ids, &pdev->dev); | |
ff05967a | 1854 | int ret; |
22698aa2 SG |
1855 | |
1856 | if (!np) | |
20bb8095 UKK |
1857 | /* no device tree device */ |
1858 | return 1; | |
22698aa2 | 1859 | |
ff05967a SG |
1860 | ret = of_alias_get_id(np, "serial"); |
1861 | if (ret < 0) { | |
1862 | dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); | |
a197a191 | 1863 | return ret; |
ff05967a SG |
1864 | } |
1865 | sport->port.line = ret; | |
22698aa2 SG |
1866 | |
1867 | if (of_get_property(np, "fsl,uart-has-rtscts", NULL)) | |
1868 | sport->have_rtscts = 1; | |
1869 | ||
20ff2fe6 HS |
1870 | if (of_get_property(np, "fsl,dte-mode", NULL)) |
1871 | sport->dte_mode = 1; | |
1872 | ||
22698aa2 SG |
1873 | sport->devdata = of_id->data; |
1874 | ||
1875 | return 0; | |
1876 | } | |
1877 | #else | |
1878 | static inline int serial_imx_probe_dt(struct imx_port *sport, | |
1879 | struct platform_device *pdev) | |
1880 | { | |
20bb8095 | 1881 | return 1; |
22698aa2 SG |
1882 | } |
1883 | #endif | |
1884 | ||
1885 | static void serial_imx_probe_pdata(struct imx_port *sport, | |
1886 | struct platform_device *pdev) | |
1887 | { | |
574de559 | 1888 | struct imxuart_platform_data *pdata = dev_get_platdata(&pdev->dev); |
22698aa2 SG |
1889 | |
1890 | sport->port.line = pdev->id; | |
1891 | sport->devdata = (struct imx_uart_data *) pdev->id_entry->driver_data; | |
1892 | ||
1893 | if (!pdata) | |
1894 | return; | |
1895 | ||
1896 | if (pdata->flags & IMXUART_HAVE_RTSCTS) | |
1897 | sport->have_rtscts = 1; | |
22698aa2 SG |
1898 | } |
1899 | ||
2582d8c1 | 1900 | static int serial_imx_probe(struct platform_device *pdev) |
1da177e4 | 1901 | { |
dbff4e9e | 1902 | struct imx_port *sport; |
dbff4e9e | 1903 | void __iomem *base; |
8a61f0c7 | 1904 | int ret = 0, reg; |
dbff4e9e | 1905 | struct resource *res; |
842633bd | 1906 | int txirq, rxirq, rtsirq; |
dbff4e9e | 1907 | |
42d34191 | 1908 | sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL); |
dbff4e9e SH |
1909 | if (!sport) |
1910 | return -ENOMEM; | |
5b802344 | 1911 | |
22698aa2 | 1912 | ret = serial_imx_probe_dt(sport, pdev); |
20bb8095 | 1913 | if (ret > 0) |
22698aa2 | 1914 | serial_imx_probe_pdata(sport, pdev); |
20bb8095 | 1915 | else if (ret < 0) |
42d34191 | 1916 | return ret; |
22698aa2 | 1917 | |
dbff4e9e | 1918 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
da82f997 AS |
1919 | base = devm_ioremap_resource(&pdev->dev, res); |
1920 | if (IS_ERR(base)) | |
1921 | return PTR_ERR(base); | |
dbff4e9e | 1922 | |
842633bd UKK |
1923 | rxirq = platform_get_irq(pdev, 0); |
1924 | txirq = platform_get_irq(pdev, 1); | |
1925 | rtsirq = platform_get_irq(pdev, 2); | |
1926 | ||
dbff4e9e SH |
1927 | sport->port.dev = &pdev->dev; |
1928 | sport->port.mapbase = res->start; | |
1929 | sport->port.membase = base; | |
1930 | sport->port.type = PORT_IMX, | |
1931 | sport->port.iotype = UPIO_MEM; | |
842633bd | 1932 | sport->port.irq = rxirq; |
dbff4e9e SH |
1933 | sport->port.fifosize = 32; |
1934 | sport->port.ops = &imx_pops; | |
17b8f2a3 UKK |
1935 | sport->port.rs485_config = imx_rs485_config; |
1936 | sport->port.rs485.flags = | |
1937 | SER_RS485_RTS_ON_SEND | SER_RS485_RX_DURING_TX; | |
dbff4e9e | 1938 | sport->port.flags = UPF_BOOT_AUTOCONF; |
dbff4e9e SH |
1939 | init_timer(&sport->timer); |
1940 | sport->timer.function = imx_timeout; | |
1941 | sport->timer.data = (unsigned long)sport; | |
38a41fdf | 1942 | |
3a9465fa SH |
1943 | sport->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); |
1944 | if (IS_ERR(sport->clk_ipg)) { | |
1945 | ret = PTR_ERR(sport->clk_ipg); | |
833462e9 | 1946 | dev_err(&pdev->dev, "failed to get ipg clk: %d\n", ret); |
42d34191 | 1947 | return ret; |
38a41fdf | 1948 | } |
38a41fdf | 1949 | |
3a9465fa SH |
1950 | sport->clk_per = devm_clk_get(&pdev->dev, "per"); |
1951 | if (IS_ERR(sport->clk_per)) { | |
1952 | ret = PTR_ERR(sport->clk_per); | |
833462e9 | 1953 | dev_err(&pdev->dev, "failed to get per clk: %d\n", ret); |
42d34191 | 1954 | return ret; |
3a9465fa SH |
1955 | } |
1956 | ||
3a9465fa | 1957 | sport->port.uartclk = clk_get_rate(sport->clk_per); |
dbff4e9e | 1958 | |
8a61f0c7 FE |
1959 | /* For register access, we only need to enable the ipg clock. */ |
1960 | ret = clk_prepare_enable(sport->clk_ipg); | |
1961 | if (ret) | |
1962 | return ret; | |
1963 | ||
1964 | /* Disable interrupts before requesting them */ | |
1965 | reg = readl_relaxed(sport->port.membase + UCR1); | |
1966 | reg &= ~(UCR1_ADEN | UCR1_TRDYEN | UCR1_IDEN | UCR1_RRDYEN | | |
1967 | UCR1_TXMPTYEN | UCR1_RTSDEN); | |
1968 | writel_relaxed(reg, sport->port.membase + UCR1); | |
1969 | ||
1970 | clk_disable_unprepare(sport->clk_ipg); | |
1971 | ||
c0d1c6b0 FE |
1972 | /* |
1973 | * Allocate the IRQ(s) i.MX1 has three interrupts whereas later | |
1974 | * chips only have one interrupt. | |
1975 | */ | |
842633bd UKK |
1976 | if (txirq > 0) { |
1977 | ret = devm_request_irq(&pdev->dev, rxirq, imx_rxint, 0, | |
c0d1c6b0 FE |
1978 | dev_name(&pdev->dev), sport); |
1979 | if (ret) | |
1980 | return ret; | |
1981 | ||
842633bd | 1982 | ret = devm_request_irq(&pdev->dev, txirq, imx_txint, 0, |
c0d1c6b0 FE |
1983 | dev_name(&pdev->dev), sport); |
1984 | if (ret) | |
1985 | return ret; | |
c0d1c6b0 | 1986 | } else { |
842633bd | 1987 | ret = devm_request_irq(&pdev->dev, rxirq, imx_int, 0, |
c0d1c6b0 FE |
1988 | dev_name(&pdev->dev), sport); |
1989 | if (ret) | |
1990 | return ret; | |
1991 | } | |
1992 | ||
22698aa2 | 1993 | imx_ports[sport->port.line] = sport; |
5b802344 | 1994 | |
0a86a86b | 1995 | platform_set_drvdata(pdev, sport); |
5b802344 | 1996 | |
45af780a | 1997 | return uart_add_one_port(&imx_reg, &sport->port); |
1da177e4 LT |
1998 | } |
1999 | ||
2582d8c1 | 2000 | static int serial_imx_remove(struct platform_device *pdev) |
1da177e4 | 2001 | { |
2582d8c1 | 2002 | struct imx_port *sport = platform_get_drvdata(pdev); |
1da177e4 | 2003 | |
45af780a | 2004 | return uart_remove_one_port(&imx_reg, &sport->port); |
1da177e4 LT |
2005 | } |
2006 | ||
c868cbb7 EV |
2007 | static void serial_imx_restore_context(struct imx_port *sport) |
2008 | { | |
2009 | if (!sport->context_saved) | |
2010 | return; | |
2011 | ||
2012 | writel(sport->saved_reg[4], sport->port.membase + UFCR); | |
2013 | writel(sport->saved_reg[5], sport->port.membase + UESC); | |
2014 | writel(sport->saved_reg[6], sport->port.membase + UTIM); | |
2015 | writel(sport->saved_reg[7], sport->port.membase + UBIR); | |
2016 | writel(sport->saved_reg[8], sport->port.membase + UBMR); | |
2017 | writel(sport->saved_reg[9], sport->port.membase + IMX21_UTS); | |
2018 | writel(sport->saved_reg[0], sport->port.membase + UCR1); | |
2019 | writel(sport->saved_reg[1] | UCR2_SRST, sport->port.membase + UCR2); | |
2020 | writel(sport->saved_reg[2], sport->port.membase + UCR3); | |
2021 | writel(sport->saved_reg[3], sport->port.membase + UCR4); | |
2022 | sport->context_saved = false; | |
2023 | } | |
2024 | ||
2025 | static void serial_imx_save_context(struct imx_port *sport) | |
2026 | { | |
2027 | /* Save necessary regs */ | |
2028 | sport->saved_reg[0] = readl(sport->port.membase + UCR1); | |
2029 | sport->saved_reg[1] = readl(sport->port.membase + UCR2); | |
2030 | sport->saved_reg[2] = readl(sport->port.membase + UCR3); | |
2031 | sport->saved_reg[3] = readl(sport->port.membase + UCR4); | |
2032 | sport->saved_reg[4] = readl(sport->port.membase + UFCR); | |
2033 | sport->saved_reg[5] = readl(sport->port.membase + UESC); | |
2034 | sport->saved_reg[6] = readl(sport->port.membase + UTIM); | |
2035 | sport->saved_reg[7] = readl(sport->port.membase + UBIR); | |
2036 | sport->saved_reg[8] = readl(sport->port.membase + UBMR); | |
2037 | sport->saved_reg[9] = readl(sport->port.membase + IMX21_UTS); | |
2038 | sport->context_saved = true; | |
2039 | } | |
2040 | ||
189550b8 EV |
2041 | static void serial_imx_enable_wakeup(struct imx_port *sport, bool on) |
2042 | { | |
2043 | unsigned int val; | |
2044 | ||
2045 | val = readl(sport->port.membase + UCR3); | |
2046 | if (on) | |
2047 | val |= UCR3_AWAKEN; | |
2048 | else | |
2049 | val &= ~UCR3_AWAKEN; | |
2050 | writel(val, sport->port.membase + UCR3); | |
bc85734b EV |
2051 | |
2052 | val = readl(sport->port.membase + UCR1); | |
2053 | if (on) | |
2054 | val |= UCR1_RTSDEN; | |
2055 | else | |
2056 | val &= ~UCR1_RTSDEN; | |
2057 | writel(val, sport->port.membase + UCR1); | |
189550b8 EV |
2058 | } |
2059 | ||
90bb6bd3 SW |
2060 | static int imx_serial_port_suspend_noirq(struct device *dev) |
2061 | { | |
2062 | struct platform_device *pdev = to_platform_device(dev); | |
2063 | struct imx_port *sport = platform_get_drvdata(pdev); | |
2064 | int ret; | |
2065 | ||
2066 | ret = clk_enable(sport->clk_ipg); | |
2067 | if (ret) | |
2068 | return ret; | |
2069 | ||
c868cbb7 | 2070 | serial_imx_save_context(sport); |
90bb6bd3 SW |
2071 | |
2072 | clk_disable(sport->clk_ipg); | |
2073 | ||
2074 | return 0; | |
2075 | } | |
2076 | ||
2077 | static int imx_serial_port_resume_noirq(struct device *dev) | |
2078 | { | |
2079 | struct platform_device *pdev = to_platform_device(dev); | |
2080 | struct imx_port *sport = platform_get_drvdata(pdev); | |
2081 | int ret; | |
2082 | ||
2083 | ret = clk_enable(sport->clk_ipg); | |
2084 | if (ret) | |
2085 | return ret; | |
2086 | ||
c868cbb7 | 2087 | serial_imx_restore_context(sport); |
90bb6bd3 SW |
2088 | |
2089 | clk_disable(sport->clk_ipg); | |
2090 | ||
2091 | return 0; | |
2092 | } | |
2093 | ||
2094 | static int imx_serial_port_suspend(struct device *dev) | |
2095 | { | |
2096 | struct platform_device *pdev = to_platform_device(dev); | |
2097 | struct imx_port *sport = platform_get_drvdata(pdev); | |
90bb6bd3 SW |
2098 | |
2099 | /* enable wakeup from i.MX UART */ | |
189550b8 | 2100 | serial_imx_enable_wakeup(sport, true); |
90bb6bd3 SW |
2101 | |
2102 | uart_suspend_port(&imx_reg, &sport->port); | |
2103 | ||
2104 | return 0; | |
2105 | } | |
2106 | ||
2107 | static int imx_serial_port_resume(struct device *dev) | |
2108 | { | |
2109 | struct platform_device *pdev = to_platform_device(dev); | |
2110 | struct imx_port *sport = platform_get_drvdata(pdev); | |
90bb6bd3 SW |
2111 | |
2112 | /* disable wakeup from i.MX UART */ | |
189550b8 | 2113 | serial_imx_enable_wakeup(sport, false); |
90bb6bd3 SW |
2114 | |
2115 | uart_resume_port(&imx_reg, &sport->port); | |
2116 | ||
2117 | return 0; | |
2118 | } | |
2119 | ||
2120 | static const struct dev_pm_ops imx_serial_port_pm_ops = { | |
2121 | .suspend_noirq = imx_serial_port_suspend_noirq, | |
2122 | .resume_noirq = imx_serial_port_resume_noirq, | |
2123 | .suspend = imx_serial_port_suspend, | |
2124 | .resume = imx_serial_port_resume, | |
2125 | }; | |
2126 | ||
3ae5eaec | 2127 | static struct platform_driver serial_imx_driver = { |
d3810cd4 OS |
2128 | .probe = serial_imx_probe, |
2129 | .remove = serial_imx_remove, | |
1da177e4 | 2130 | |
fe6b540a | 2131 | .id_table = imx_uart_devtype, |
3ae5eaec | 2132 | .driver = { |
d3810cd4 | 2133 | .name = "imx-uart", |
22698aa2 | 2134 | .of_match_table = imx_uart_dt_ids, |
90bb6bd3 | 2135 | .pm = &imx_serial_port_pm_ops, |
3ae5eaec | 2136 | }, |
1da177e4 LT |
2137 | }; |
2138 | ||
2139 | static int __init imx_serial_init(void) | |
2140 | { | |
f0fd1b73 | 2141 | int ret = uart_register_driver(&imx_reg); |
1da177e4 | 2142 | |
1da177e4 LT |
2143 | if (ret) |
2144 | return ret; | |
2145 | ||
3ae5eaec | 2146 | ret = platform_driver_register(&serial_imx_driver); |
1da177e4 LT |
2147 | if (ret != 0) |
2148 | uart_unregister_driver(&imx_reg); | |
2149 | ||
f227824e | 2150 | return ret; |
1da177e4 LT |
2151 | } |
2152 | ||
2153 | static void __exit imx_serial_exit(void) | |
2154 | { | |
c889b896 | 2155 | platform_driver_unregister(&serial_imx_driver); |
4b300c36 | 2156 | uart_unregister_driver(&imx_reg); |
1da177e4 LT |
2157 | } |
2158 | ||
2159 | module_init(imx_serial_init); | |
2160 | module_exit(imx_serial_exit); | |
2161 | ||
2162 | MODULE_AUTHOR("Sascha Hauer"); | |
2163 | MODULE_DESCRIPTION("IMX generic serial port driver"); | |
2164 | MODULE_LICENSE("GPL"); | |
e169c139 | 2165 | MODULE_ALIAS("platform:imx-uart"); |