uart_dev_imx.c revision 248557
1/*-
2 * Copyright (c) 2012 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Oleksandr Rybalko under sponsorship
6 * from the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1.	Redistributions of source code must retain the above copyright
12 *	notice, this list of conditions and the following disclaimer.
13 * 2.	Redistributions in binary form must reproduce the above copyright
14 *	notice, this list of conditions and the following disclaimer in the
15 *	documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: head/sys/dev/uart/uart_dev_imx.c 248557 2013-03-20 15:39:27Z ray $");
32
33#include "opt_ddb.h"
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/bus.h>
38#include <sys/conf.h>
39#include <sys/kdb.h>
40#include <machine/bus.h>
41#include <machine/fdt.h>
42
43#include <dev/uart/uart.h>
44#include <dev/uart/uart_cpu.h>
45#include <dev/uart/uart_bus.h>
46
47#include <dev/uart/uart_dev_imx5xx.h>
48
49#include "uart_if.h"
50/*
51 * Low-level UART interface.
52 */
53static int imx_uart_probe(struct uart_bas *bas);
54static void imx_uart_init(struct uart_bas *bas, int, int, int, int);
55static void imx_uart_term(struct uart_bas *bas);
56static void imx_uart_putc(struct uart_bas *bas, int);
57static int imx_uart_rxready(struct uart_bas *bas);
58static int imx_uart_getc(struct uart_bas *bas, struct mtx *);
59
60static struct uart_ops uart_imx_uart_ops = {
61	.probe = imx_uart_probe,
62	.init = imx_uart_init,
63	.term = imx_uart_term,
64	.putc = imx_uart_putc,
65	.rxready = imx_uart_rxready,
66	.getc = imx_uart_getc,
67};
68
69static int
70imx_uart_probe(struct uart_bas *bas)
71{
72
73	return (0);
74}
75
76static void
77imx_uart_init(struct uart_bas *bas, int baudrate, int databits,
78    int stopbits, int parity)
79{
80
81}
82
83static void
84imx_uart_term(struct uart_bas *bas)
85{
86
87}
88
89static void
90imx_uart_putc(struct uart_bas *bas, int c)
91{
92
93	while (!(IS(bas, USR2, TXFE)))
94		;
95	SETREG(bas, REG(UTXD), c);
96}
97
98static int
99imx_uart_rxready(struct uart_bas *bas)
100{
101
102	return ((IS(bas, USR2, RDR)) ? 1 : 0);
103}
104
105static int
106imx_uart_getc(struct uart_bas *bas, struct mtx *hwmtx)
107{
108	int c;
109
110	uart_lock(hwmtx);
111	while (!(IS(bas, USR2, RDR)))
112		;
113
114	c = GETREG(bas, REG(URXD));
115	uart_unlock(hwmtx);
116#if defined(KDB)
117	if (c & FLD(URXD, BRK)) {
118		if (kdb_break())
119			return (0);
120	}
121#endif
122	return (c & 0xff);
123}
124
125/*
126 * High-level UART interface.
127 */
128struct imx_uart_softc {
129	struct uart_softc base;
130};
131
132static int imx_uart_bus_attach(struct uart_softc *);
133static int imx_uart_bus_detach(struct uart_softc *);
134static int imx_uart_bus_flush(struct uart_softc *, int);
135static int imx_uart_bus_getsig(struct uart_softc *);
136static int imx_uart_bus_ioctl(struct uart_softc *, int, intptr_t);
137static int imx_uart_bus_ipend(struct uart_softc *);
138static int imx_uart_bus_param(struct uart_softc *, int, int, int, int);
139static int imx_uart_bus_probe(struct uart_softc *);
140static int imx_uart_bus_receive(struct uart_softc *);
141static int imx_uart_bus_setsig(struct uart_softc *, int);
142static int imx_uart_bus_transmit(struct uart_softc *);
143
144static kobj_method_t imx_uart_methods[] = {
145	KOBJMETHOD(uart_attach,		imx_uart_bus_attach),
146	KOBJMETHOD(uart_detach,		imx_uart_bus_detach),
147	KOBJMETHOD(uart_flush,		imx_uart_bus_flush),
148	KOBJMETHOD(uart_getsig,		imx_uart_bus_getsig),
149	KOBJMETHOD(uart_ioctl,		imx_uart_bus_ioctl),
150	KOBJMETHOD(uart_ipend,		imx_uart_bus_ipend),
151	KOBJMETHOD(uart_param,		imx_uart_bus_param),
152	KOBJMETHOD(uart_probe,		imx_uart_bus_probe),
153	KOBJMETHOD(uart_receive,	imx_uart_bus_receive),
154	KOBJMETHOD(uart_setsig,		imx_uart_bus_setsig),
155	KOBJMETHOD(uart_transmit,	imx_uart_bus_transmit),
156	{ 0, 0 }
157};
158
159struct uart_class uart_imx_class = {
160	"imx",
161	imx_uart_methods,
162	sizeof(struct imx_uart_softc),
163	.uc_ops = &uart_imx_uart_ops,
164	.uc_range = 0x100,
165	.uc_rclk = 24000000 /* TODO: get value from CCM */
166};
167
168#define	SIGCHG(c, i, s, d)				\
169	if (c) {					\
170		i |= (i & s) ? s : s | d;		\
171	} else {					\
172		i = (i & s) ? (i & ~s) | d : i;		\
173	}
174
175static int
176imx_uart_bus_attach(struct uart_softc *sc)
177{
178	struct uart_bas *bas;
179	struct uart_devinfo *di;
180
181	bas = &sc->sc_bas;
182	if (sc->sc_sysdev != NULL) {
183		di = sc->sc_sysdev;
184		imx_uart_init(bas, di->baudrate, di->databits, di->stopbits,
185		    di->parity);
186	} else {
187		imx_uart_init(bas, 115200, 8, 1, 0);
188	}
189
190	sc->sc_rxfifosz = 1;
191	sc->sc_txfifosz = 1;
192
193	(void)imx_uart_bus_getsig(sc);
194
195	/* XXX workaround to have working console on manut prompt */
196	if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE){
197		DIS(bas, UCR4, DREN);
198	} else {
199		ENA(bas, UCR4, DREN);
200	}
201	DIS(bas, UCR1, RRDYEN);
202	DIS(bas, UCR1, IDEN);
203	DIS(bas, UCR3, RXDSEN);
204	DIS(bas, UCR2, ATEN);
205	DIS(bas, UCR1, TXMPTYEN);
206	DIS(bas, UCR1, TRDYEN);
207	DIS(bas, UCR4, TCEN);
208	DIS(bas, UCR4, OREN);
209	ENA(bas, UCR4, BKEN);
210	DIS(bas, UCR4, WKEN);
211	DIS(bas, UCR1, ADEN);
212	DIS(bas, UCR3, ACIEN);
213	DIS(bas, UCR2, ESCI);
214	DIS(bas, UCR4, ENIRI);
215	DIS(bas, UCR3, AIRINTEN);
216	DIS(bas, UCR3, AWAKEN);
217	DIS(bas, UCR3, FRAERREN);
218	DIS(bas, UCR3, PARERREN);
219	DIS(bas, UCR1, RTSDEN);
220	DIS(bas, UCR2, RTSEN);
221	DIS(bas, UCR3, DTREN);
222	DIS(bas, UCR3, RI);
223	DIS(bas, UCR3, DCD);
224	DIS(bas, UCR3, DTRDEN);
225
226	/* ACK all interrupts */
227	SETREG(bas, REG(USR1), 0xffff);
228	SETREG(bas, REG(USR2), 0xffff);
229	return (0);
230}
231
232static int
233imx_uart_bus_detach(struct uart_softc *sc)
234{
235
236	SETREG(&sc->sc_bas, REG(UCR4), 0);
237
238	return (0);
239}
240
241static int
242imx_uart_bus_flush(struct uart_softc *sc, int what)
243{
244
245	/* TODO */
246	return (0);
247}
248
249static int
250imx_uart_bus_getsig(struct uart_softc *sc)
251{
252	uint32_t new, old, sig;
253	uint8_t bes;
254
255	do {
256		old = sc->sc_hwsig;
257		sig = old;
258		uart_lock(sc->sc_hwmtx);
259		bes = GETREG(&sc->sc_bas, REG(USR2));
260		uart_unlock(sc->sc_hwmtx);
261		/* XXX: chip can show delta */
262		SIGCHG(bes & FLD(USR2, DCDIN), sig, SER_DCD, SER_DDCD);
263		new = sig & ~SER_MASK_DELTA;
264	} while (!atomic_cmpset_32(&sc->sc_hwsig, old, new));
265
266	return (sig);
267}
268
269static int
270imx_uart_bus_ioctl(struct uart_softc *sc, int request, intptr_t data)
271{
272	struct uart_bas *bas;
273	int error;
274
275	bas = &sc->sc_bas;
276	error = 0;
277	uart_lock(sc->sc_hwmtx);
278	switch (request) {
279	case UART_IOCTL_BREAK:
280		/* TODO */
281		break;
282	case UART_IOCTL_BAUD:
283		/* TODO */
284		*(int*)data = 115200;
285		break;
286	default:
287		error = EINVAL;
288		break;
289	}
290	uart_unlock(sc->sc_hwmtx);
291
292	return (error);
293}
294
295static int
296imx_uart_bus_ipend(struct uart_softc *sc)
297{
298	struct uart_bas *bas;
299	int ipend;
300	uint32_t usr1, usr2;
301	uint32_t ucr1, ucr4;
302
303	bas = &sc->sc_bas;
304	ipend = 0;
305
306	uart_lock(sc->sc_hwmtx);
307
308	/* Read pending interrupts */
309	usr1 = GETREG(bas, REG(USR1));
310	usr2 = GETREG(bas, REG(USR2));
311	/* ACK interrupts */
312	SETREG(bas, REG(USR1), usr1);
313	SETREG(bas, REG(USR2), usr2);
314
315	ucr1 = GETREG(bas, REG(UCR1));
316	ucr4 = GETREG(bas, REG(UCR4));
317
318	if ((usr2 & FLD(USR2, TXFE)) && (ucr1 & FLD(UCR1, TXMPTYEN))) {
319		DIS(bas, UCR1, TXMPTYEN);
320		/* Continue TXing */
321		ipend |= SER_INT_TXIDLE;
322	}
323	if ((usr2 & FLD(USR2, RDR)) && (ucr4 & FLD(UCR4, DREN))) {
324		DIS(bas, UCR4, DREN);
325		/* Wow, new char on input */
326		ipend |= SER_INT_RXREADY;
327	}
328	if ((usr2 & FLD(USR2, BRCD)) && (ucr4 & FLD(UCR4, BKEN)))
329		ipend |= SER_INT_BREAK;
330
331	uart_unlock(sc->sc_hwmtx);
332
333	return (ipend);
334}
335
336static int
337imx_uart_bus_param(struct uart_softc *sc, int baudrate, int databits,
338    int stopbits, int parity)
339{
340
341	uart_lock(sc->sc_hwmtx);
342	imx_uart_init(&sc->sc_bas, baudrate, databits, stopbits, parity);
343	uart_unlock(sc->sc_hwmtx);
344	return (0);
345}
346
347static int
348imx_uart_bus_probe(struct uart_softc *sc)
349{
350	int error;
351
352	error = imx_uart_probe(&sc->sc_bas);
353	if (error)
354		return (error);
355
356	device_set_desc(sc->sc_dev, "imx_uart");
357	return (0);
358}
359
360static int
361imx_uart_bus_receive(struct uart_softc *sc)
362{
363	struct uart_bas *bas;
364	int xc, out;
365
366	bas = &sc->sc_bas;
367	uart_lock(sc->sc_hwmtx);
368
369	/* Read while we have anything in FIFO */
370	while (IS(bas, USR2, RDR)) {
371		if (uart_rx_full(sc)) {
372			/* No space left in input buffer */
373			sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN;
374			break;
375		}
376		out = 0;
377		xc = GETREG(bas, REG(URXD));
378
379		/* We have valid char */
380		if (xc & FLD(URXD, CHARRDY))
381			out = xc & 0x000000ff;
382
383		if (xc & FLD(URXD, FRMERR))
384			out |= UART_STAT_FRAMERR;
385		if (xc & FLD(URXD, PRERR))
386			out |= UART_STAT_PARERR;
387		if (xc & FLD(URXD, OVRRUN))
388			out |= UART_STAT_OVERRUN;
389		if (xc & FLD(URXD, BRK))
390			out |= UART_STAT_BREAK;
391
392		uart_rx_put(sc, out);
393	}
394	/* Reenable Data Ready interrupt */
395	ENA(bas, UCR4, DREN);
396
397	uart_unlock(sc->sc_hwmtx);
398	return (0);
399}
400
401static int
402imx_uart_bus_setsig(struct uart_softc *sc, int sig)
403{
404
405	/* TODO: implement (?) */
406
407	/* XXX workaround to have working console on mount prompt */
408	/* Enable RX interrupt */
409	if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE)
410		if (!IS(&sc->sc_bas, UCR4, DREN))
411			ENA(&sc->sc_bas, UCR4, DREN);
412	return (0);
413}
414
415static int
416imx_uart_bus_transmit(struct uart_softc *sc)
417{
418	struct uart_bas *bas = &sc->sc_bas;
419	int i;
420
421	bas = &sc->sc_bas;
422	uart_lock(sc->sc_hwmtx);
423
424	/* Fill TX FIFO */
425	for (i = 0; i < sc->sc_txdatasz; i++) {
426		SETREG(bas, REG(UTXD), sc->sc_txbuf[i] & 0xff);
427	}
428
429	sc->sc_txbusy = 1;
430	/* Call me when ready */
431	ENA(bas, UCR1, TXMPTYEN);
432
433	uart_unlock(sc->sc_hwmtx);
434
435	return (0);
436}
437