Root/target/linux/ubicom32/files/drivers/serial/ubi32_mailbox.c

1/*
2 * drivers/serial/ubi32_mailbox.c
3 * Ubicom32 On-Chip Mailbox Driver
4 *
5 * (C) Copyright 2009, Ubicom, Inc.
6 *
7 * This file is part of the Ubicom32 Linux Kernel Port.
8 *
9 * The Ubicom32 Linux Kernel Port is free software: you can redistribute
10 * it and/or modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation, either version 2 of the
12 * License, or (at your option) any later version.
13 *
14 * The Ubicom32 Linux Kernel Port is distributed in the hope that it
15 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
16 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with the Ubicom32 Linux Kernel Port. If not,
21 * see <http://www.gnu.org/licenses/>.
22 *
23 * Ubicom32 implementation derived from (with many thanks):
24 * arch/m68knommu
25 * arch/blackfin
26 * arch/parisc
27 */
28#include <linux/module.h>
29#include <linux/ioport.h>
30#include <linux/init.h>
31#include <linux/console.h>
32#include <linux/sysrq.h>
33#include <linux/platform_device.h>
34#include <linux/tty.h>
35#include <linux/tty_flip.h>
36#include <linux/serial_core.h>
37#include <linux/version.h>
38
39#include <asm/ip5000.h>
40
41#define SERIAL_UBICOM_BAUDRATE 115200
42#define SERIAL_UBICOM_DATA_BIT 8 /* Fixed parameter - do not change */
43#define SERIAL_UBICOM_PAR_BIT 0 /* Fixed parameter - do not change */
44#define SERIAL_UBICOM_STOP_BIT 1 /* Fixed parameter - do not change */
45
46/* UART name and device definitions */
47#define UBI32_MAILBOX_NAME "ttyUM" // XXX
48#define UBI32_MAILBOX_MAJOR 207 // XXX
49#define UBI32_MAILBOX_MINOR 64
50
51#define PORT_UBI32_MAILBOX 1235
52#define NR_PORTS 1
53
54#define get_sclk() 0
55
56struct ubi32_mailbox_port {
57    struct uart_port port;
58    /*
59     * NOTE (rkeller):
60     * the uart port is wrapped in another structure in case we need to hold more state than
61     * what we can hold in the uart_port.
62     * Not sure if we need this, I took over the concept from the blackfin driver.
63     */
64} ubi32_mailbox_ports[NR_PORTS];
65
66struct ubi32_mailbox_resource {
67    int uart_base_addr;
68    int uart_irq;
69} ubi32_mailbox_resource[NR_PORTS] = {
70    /*
71     * uart_base_addr has to be non-NULL because it is put in the uart_port membase.
72     * If membase if null the kernel skips the configuration and our port_type never gets set.
73     */
74    {ISD_MAILBOX_BASE, ISD_MAILBOX_INT}
75};
76
77static volatile struct ubicom32_isd_mailbox {
78    volatile u32_t in;
79    volatile u32_t out;
80    volatile u32_t status;
81} *ubi32_mailbox = (struct ubicom32_isd_mailbox *)ISD_MAILBOX_BASE;
82
83static void ubi32_mailbox_tx_chars(struct ubi32_mailbox_port *uart);
84
85static void ubi32_mailbox_mctrl_check(struct ubi32_mailbox_port *uart);
86
87#define TRUE 1
88#define FALSE 0
89
90static int mailbox_console_flg = TRUE;
91static int num_timeouts = 0;
92
93/*
94 * dummy functions and defined to be able to compile the Blackfin code
95 */
96#define UART_GET_LSR(port) (1)
97#define UART_PUT_LSR(port, bits)
98#define UART_CLEAR_LSR(port) (1)
99#define TEMT 1
100#define TFI 1
101#define BI 1
102#define PE 1
103#define OE 1
104#define FE 1
105#define THRE 1
106#define DR 1
107#define UART_GET_LCR(port) (1)
108#define UART_PUT_LCR(port, bits)
109#define SB 1
110#define STB 1
111#define PEN 1
112#define EPS 1
113#define STP 1
114#define WLS(n) 0
115#define UART_GET_IER(port) (1)
116#define UART_SET_IER(port, bits)
117#define UART_CLEAR_IER(port, bits)
118#define ETBEI 0
119#define ERBFI 0
120#define UART_GET_CHAR(port) ubi32_mailbox_get_char()
121#define UART_PUT_CHAR(port, ch) ubi32_mailbox_put_char(ch)
122#define SSYNC()
123#define UART_GET_DLL(port) 0
124#define UART_PUT_DLL(port, ch)
125#define UART_GET_DLH(port) 0
126#define UART_PUT_DLH(port, ch)
127#define UART_GET_GCTL(port) (0)
128#define UART_PUT_GCTL(port, ch)
129#define UCEN 1
130
131/*
132 * ubi32_mailbox_get_char_avail()
133 */
134static int ubi32_mailbox_get_char_avail(void)
135{
136    return !(ubi32_mailbox->status & ISD_MAILBOX_STATUS_IN_EMPTY);
137}
138
139/*
140 * ubi32_mailbox_get_char()
141 */
142static u32_t ubi32_mailbox_get_char(void)
143{
144    if (mailbox_console_flg == TRUE) {
145        /*
146         * Mailbox console is connected.
147         */
148        while (ubi32_mailbox->status & ISD_MAILBOX_STATUS_IN_EMPTY);
149        return ubi32_mailbox->in & 0xff;
150    }
151
152    /*
153     * Mailbox console was not connected.
154     */
155    if (ubi32_mailbox->status & ISD_MAILBOX_STATUS_IN_EMPTY) {
156        return 0xff;
157    }
158
159    /*
160     * Mailbox console is connecting.
161     */
162    mailbox_console_flg = TRUE;
163    num_timeouts = 0;
164    return ubi32_mailbox->in & 0xff;
165}
166
167#define MAILBOX_MAX_ATTEMPTS 1000000
168#define MAILBOX_MAX_TIMEOUTS 5
169/*
170 * ubi32_mailbox_put_char()
171 */
172static void ubi32_mailbox_put_char(u32_t v)
173{
174    /*
175     * Wait to be able to output.
176     */
177    u32_t num_attempts = 0;
178
179    if(mailbox_console_flg == TRUE) {
180        while(num_attempts++ < MAILBOX_MAX_ATTEMPTS) {
181            if(ubi32_mailbox->status & ISD_MAILBOX_STATUS_OUT_EMPTY) {
182                break;
183            }
184        }
185
186        /*
187         * If timed out more than 5 times on send, mailbox console is disconnected now.
188         */
189        if (num_attempts > MAILBOX_MAX_ATTEMPTS) {
190            if (num_timeouts++ > MAILBOX_MAX_TIMEOUTS) {
191                mailbox_console_flg = FALSE;
192            }
193        }
194    }
195
196    asm volatile(
197        "pipe_flush 0 \n\t"
198        "pipe_flush 0 \n\t"
199        "pipe_flush 0 \n\t"
200        "pipe_flush 0 \n\t"
201        "pipe_flush 0 \n\t"
202        "pipe_flush 0 \n\t"
203        "pipe_flush 0 \n\t"
204    );
205
206    ubi32_mailbox->out = v & 0xff;
207}
208
209static void ubi32_mailbox_hw_init(struct ubi32_mailbox_port *uart)
210{
211// NOTE: It does not do any good to do these here because we are running on the linux hardware thread,
212// and these have to be called on the ldsr thread.
213// ubicom32_clear_interrupt(ISD_MAILBOX_INT);
214// ubicom32_enable_interrupt(ISD_MAILBOX_INT);
215}
216
217/*
218 * interrupts are disabled on entry
219 */
220static void ubi32_mailbox_stop_tx(struct uart_port *port)
221{
222// struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
223// struct circ_buf *xmit = &uart->port.info->xmit;
224
225    while (!(UART_GET_LSR(uart) & TEMT))
226        cpu_relax();
227
228    /* Clear TFI bit */
229    UART_PUT_LSR(uart, TFI);
230    UART_CLEAR_IER(uart, ETBEI);
231}
232
233/*
234 * port is locked and interrupts are disabled
235 */
236static void ubi32_mailbox_start_tx(struct uart_port *port)
237{
238    struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
239
240    UART_SET_IER(uart, ETBEI);
241
242    ubi32_mailbox_tx_chars(uart);
243}
244
245/*
246 * Interrupts are enabled
247 */
248static void ubi32_mailbox_stop_rx(struct uart_port *port)
249{
250// struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
251    UART_CLEAR_IER(uart, ERBFI);
252}
253
254/*
255 * Set the modem control timer to fire immediately.
256 */
257static void ubi32_mailbox_enable_ms(struct uart_port *port)
258{
259}
260
261static void ubi32_mailbox_rx_chars(struct ubi32_mailbox_port *uart)
262{
263#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
264    struct uart_state *state = uart->port.state;
265    struct tty_struct *tty = state->port.tty;
266#else
267    struct uart_info *info = uart->port.info;
268    struct tty_struct *tty = info->port.tty;
269#endif
270    unsigned int status, ch, flg;
271
272    status = 0; // XXX? UART_GET_LSR(uart);
273    UART_CLEAR_LSR(uart);
274
275    ch = UART_GET_CHAR(uart);
276
277    if(ch == 0xff)
278        return;
279
280    uart->port.icount.rx++;
281
282    if (status & BI) {
283        uart->port.icount.brk++;
284        if (uart_handle_break(&uart->port))
285            goto ignore_char;
286        status &= ~(PE | FE);
287    }
288    if (status & PE)
289        uart->port.icount.parity++;
290    if (status & OE)
291        uart->port.icount.overrun++;
292    if (status & FE)
293        uart->port.icount.frame++;
294
295    status &= uart->port.read_status_mask;
296
297    if (status & BI)
298        flg = TTY_BREAK;
299    else if (status & PE)
300        flg = TTY_PARITY;
301    else if (status & FE)
302        flg = TTY_FRAME;
303    else
304        flg = TTY_NORMAL;
305
306    if (uart_handle_sysrq_char(&uart->port, ch))
307        goto ignore_char;
308
309    uart_insert_char(&uart->port, status, OE, ch, flg);
310
311 ignore_char:
312    tty_flip_buffer_push(tty);
313}
314
315static void ubi32_mailbox_tx_chars(struct ubi32_mailbox_port *uart)
316{
317#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
318    struct circ_buf *xmit = &uart->port.state->xmit;
319#else
320    struct circ_buf *xmit = &uart->port.info->xmit;
321#endif
322
323    if (uart->port.x_char) {
324        UART_PUT_CHAR(uart, uart->port.x_char);
325        uart->port.icount.tx++;
326        uart->port.x_char = 0;
327    }
328    /*
329     * Check the modem control lines before
330     * transmitting anything.
331     */
332    ubi32_mailbox_mctrl_check(uart);
333
334    if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
335        ubi32_mailbox_stop_tx(&uart->port);
336        return;
337    }
338
339    while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
340        UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
341        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
342        uart->port.icount.tx++;
343        SSYNC();
344    }
345
346    if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
347        uart_write_wakeup(&uart->port);
348
349    if (uart_circ_empty(xmit))
350        ubi32_mailbox_stop_tx(&uart->port);
351}
352
353static irqreturn_t ubi32_mailbox_isr(int irq, void *dev_id)
354{
355    struct ubi32_mailbox_port *uart = dev_id;
356
357    spin_lock(&uart->port.lock);
358
359    //XXX?while (UART_GET_LSR(uart) & DR)
360
361    /*
362     * RX process
363     */
364    while (ubi32_mailbox_get_char_avail()) {
365        ubi32_mailbox_rx_chars(uart);
366    }
367
368#if 0
369    /*
370     * TX process
371     */
372    if (this_uart.tx_in == this_uart.tx_out) {
373        UBICOM32_IO_PORT(SERIAL_UBICOM_PORT)->int_mask &= ~IO_PORTX_INT_SERDES_TXBE;
374    } else if (UBICOM32_IO_PORT(SERIAL_UBICOM_PORT)->int_status & IO_PORTX_INT_SERDES_TXBE) {
375        uart_ubicom32_send(this_uart.tx_buf[this_uart.tx_out & (SERIAL_UBICOM_BUF_SIZE - 1)]);
376        this_uart.tx_out++;
377        UBICOM32_IO_PORT(SERIAL_UBICOM_PORT)->int_mask |= IO_PORTX_INT_SERDES_TXBE;
378    }
379#endif
380
381    spin_unlock(&uart->port.lock);
382
383    return IRQ_HANDLED;
384}
385#if 0
386static irqreturn_t ubi32_mailbox_tx_int(int irq, void *dev_id)
387{
388    struct ubi32_mailbox_port *uart = dev_id;
389
390    spin_lock(&uart->port.lock);
391    if (UART_GET_LSR(uart) & THRE)
392        ubi32_mailbox_tx_chars(uart);
393    spin_unlock(&uart->port.lock);
394
395    return IRQ_HANDLED;
396}
397#endif
398
399/*
400 * Return TIOCSER_TEMT when transmitter is not busy.
401 */
402static unsigned int ubi32_mailbox_tx_empty(struct uart_port *port)
403{
404// struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
405    unsigned short lsr;
406
407    lsr = UART_GET_LSR(uart);
408    if (lsr & TEMT)
409        return TIOCSER_TEMT;
410    else
411        return 0;
412}
413
414static unsigned int ubi32_mailbox_get_mctrl(struct uart_port *port)
415{
416        return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
417}
418
419static void ubi32_mailbox_set_mctrl(struct uart_port *port, unsigned int mctrl)
420{
421}
422
423/*
424 * Handle any change of modem status signal since we were last called.
425 */
426static void ubi32_mailbox_mctrl_check(struct ubi32_mailbox_port *uart)
427{
428}
429
430/*
431 * Interrupts are always disabled.
432 */
433static void ubi32_mailbox_break_ctl(struct uart_port *port, int break_state)
434{
435// struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
436    u16 lcr = UART_GET_LCR(uart);
437    if (break_state)
438        lcr |= SB;
439    else
440        lcr &= ~SB;
441    UART_PUT_LCR(uart, lcr);
442    SSYNC();
443}
444
445static int ubi32_mailbox_startup(struct uart_port *port)
446{
447    struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
448
449    if (request_irq(uart->port.irq, ubi32_mailbox_isr, IRQF_DISABLED,
450         "UBI32_MAILBOX", uart)) {
451        printk(KERN_NOTICE "Unable to attach Ubicom32 SERDES interrupt\n");
452        return -EBUSY;
453    }
454
455    UART_SET_IER(uart, ERBFI);
456    return 0;
457}
458
459static void ubi32_mailbox_shutdown(struct uart_port *port)
460{
461    struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
462
463    free_irq(uart->port.irq, uart);
464}
465
466static void
467ubi32_mailbox_set_termios(struct uart_port *port, struct ktermios *termios,
468           struct ktermios *old)
469{
470    struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
471    unsigned long flags;
472    unsigned int baud, quot;
473    unsigned short val, ier, lsr, lcr = 0;
474
475    switch (termios->c_cflag & CSIZE) {
476    case CS8:
477        lcr = WLS(8);
478        break;
479    case CS7:
480        lcr = WLS(7);
481        break;
482    case CS6:
483        lcr = WLS(6);
484        break;
485    case CS5:
486        lcr = WLS(5);
487        break;
488    default:
489        printk(KERN_ERR "%s: word lengh not supported\n",
490            __FUNCTION__);
491    }
492
493    if (termios->c_cflag & CSTOPB)
494        lcr |= STB;
495    if (termios->c_cflag & PARENB)
496        lcr |= PEN;
497    if (!(termios->c_cflag & PARODD))
498        lcr |= EPS;
499    if (termios->c_cflag & CMSPAR)
500        lcr |= STP;
501
502    port->read_status_mask = OE;
503    if (termios->c_iflag & INPCK)
504        port->read_status_mask |= (FE | PE);
505    if (termios->c_iflag & (BRKINT | PARMRK))
506        port->read_status_mask |= BI;
507
508    /*
509     * Characters to ignore
510     */
511    port->ignore_status_mask = 0;
512    if (termios->c_iflag & IGNPAR)
513        port->ignore_status_mask |= FE | PE;
514    if (termios->c_iflag & IGNBRK) {
515        port->ignore_status_mask |= BI;
516        /*
517         * If we're ignoring parity and break indicators,
518         * ignore overruns too (for real raw support).
519         */
520        if (termios->c_iflag & IGNPAR)
521            port->ignore_status_mask |= OE;
522    }
523
524    baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
525    quot = uart_get_divisor(port, baud);
526    spin_lock_irqsave(&uart->port.lock, flags);
527
528    do {
529        lsr = UART_GET_LSR(uart);
530    } while (!(lsr & TEMT));
531
532    /* Disable UART */
533    ier = UART_GET_IER(uart);
534    UART_CLEAR_IER(uart, 0xF);
535
536    UART_PUT_DLL(uart, quot & 0xFF);
537    SSYNC();
538    UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
539    SSYNC();
540
541    UART_PUT_LCR(uart, lcr);
542
543    /* Enable UART */
544    UART_SET_IER(uart, ier);
545
546    val = UART_GET_GCTL(uart);
547    val |= UCEN;
548    UART_PUT_GCTL(uart, val);
549
550    spin_unlock_irqrestore(&uart->port.lock, flags);
551}
552
553static const char *ubi32_mailbox_type(struct uart_port *port)
554{
555    struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
556
557    return uart->port.type == PORT_UBI32_MAILBOX ? "UBI32_MAILBOX" : NULL;
558}
559
560/*
561 * Release the memory region(s) being used by 'port'.
562 */
563static void ubi32_mailbox_release_port(struct uart_port *port)
564{
565}
566
567/*
568 * Request the memory region(s) being used by 'port'.
569 */
570static int ubi32_mailbox_request_port(struct uart_port *port)
571{
572    return 0;
573}
574
575/*
576 * Configure/autoconfigure the port.
577 */
578static void ubi32_mailbox_config_port(struct uart_port *port, int flags)
579{
580    struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
581
582    if (flags & UART_CONFIG_TYPE && ubi32_mailbox_request_port(&uart->port) == 0)
583        uart->port.type = PORT_UBI32_MAILBOX;
584}
585
586/*
587 * Verify the new serial_struct (for TIOCSSERIAL).
588 * The only change we allow are to the flags and type, and
589 * even then only between PORT_UBI32_MAILBOX and PORT_UNKNOWN
590 */
591static int
592ubi32_mailbox_verify_port(struct uart_port *port, struct serial_struct *ser)
593{
594    return 0;
595}
596
597static struct uart_ops ubi32_mailbox_pops = {
598    .tx_empty = ubi32_mailbox_tx_empty,
599    .set_mctrl = ubi32_mailbox_set_mctrl,
600    .get_mctrl = ubi32_mailbox_get_mctrl,
601    .stop_tx = ubi32_mailbox_stop_tx,
602    .start_tx = ubi32_mailbox_start_tx,
603    .stop_rx = ubi32_mailbox_stop_rx,
604    .enable_ms = ubi32_mailbox_enable_ms,
605    .break_ctl = ubi32_mailbox_break_ctl,
606    .startup = ubi32_mailbox_startup,
607    .shutdown = ubi32_mailbox_shutdown,
608    .set_termios = ubi32_mailbox_set_termios,
609    .type = ubi32_mailbox_type,
610    .release_port = ubi32_mailbox_release_port,
611    .request_port = ubi32_mailbox_request_port,
612    .config_port = ubi32_mailbox_config_port,
613    .verify_port = ubi32_mailbox_verify_port,
614};
615
616static void __init ubi32_mailbox_init_ports(void)
617{
618    static int first = 1;
619    int i;
620
621    if (!first)
622        return;
623    first = 0;
624
625    for (i = 0; i < NR_PORTS; i++) {
626        ubi32_mailbox_ports[i].port.uartclk = get_sclk();
627        ubi32_mailbox_ports[i].port.ops = &ubi32_mailbox_pops;
628        ubi32_mailbox_ports[i].port.line = i;
629        ubi32_mailbox_ports[i].port.iotype = UPIO_MEM;
630        ubi32_mailbox_ports[i].port.membase =
631            (void __iomem *)ubi32_mailbox_resource[i].uart_base_addr;
632        ubi32_mailbox_ports[i].port.mapbase =
633            ubi32_mailbox_resource[i].uart_base_addr;
634        ubi32_mailbox_ports[i].port.irq =
635            ubi32_mailbox_resource[i].uart_irq;
636        ubi32_mailbox_ports[i].port.flags = UPF_BOOT_AUTOCONF;
637        spin_lock_init(&ubi32_mailbox_ports[i].port.lock);
638
639        ubi32_mailbox_hw_init(&ubi32_mailbox_ports[i]);
640    }
641
642}
643
644#ifdef CONFIG_SERIAL_UBI32_MAILBOX_CONSOLE
645/*
646 * If the port was already initialised (eg, by a boot loader),
647 * try to determine the current setup.
648 */
649static void __init
650ubi32_mailbox_console_get_options(struct ubi32_mailbox_port *uart, int *baud,
651               int *parity, int *bits)
652{
653    unsigned short status;
654
655    status = UART_GET_IER(uart) & (ERBFI | ETBEI);
656    if (status == (ERBFI | ETBEI)) {
657        /* ok, the port was enabled */
658        unsigned short lcr;
659        unsigned short dlh, dll;
660
661        lcr = UART_GET_LCR(uart);
662
663        *parity = 'n';
664        if (lcr & PEN) {
665            if (lcr & EPS)
666                *parity = 'e';
667            else
668                *parity = 'o';
669        }
670        switch (lcr & 0x03) {
671            case 0: *bits = 5; break;
672            case 1: *bits = 6; break;
673            case 2: *bits = 7; break;
674            case 3: *bits = 8; break;
675        }
676
677        dll = UART_GET_DLL(uart);
678        dlh = UART_GET_DLH(uart);
679
680        *baud = get_sclk() / (16*(dll | dlh << 8));
681    }
682    pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
683}
684#endif
685
686#if defined(CONFIG_SERIAL_UBI32_MAILBOX_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
687static struct uart_driver ubi32_mailbox_reg;
688
689static int __init
690ubi32_mailbox_console_setup(struct console *co, char *options)
691{
692    struct ubi32_mailbox_port *uart;
693# ifdef CONFIG_SERIAL_UBI32_MAILBOX_CONSOLE
694    int baud = SERIAL_UBICOM_BAUDRATE;
695    int bits = 8;
696    int parity = 'n';
697    int flow = 'n';
698# endif
699
700    /*
701     * Check whether an invalid uart number has been specified, and
702     * if so, search for the first available port that does have
703     * console support.
704     */
705    if (co->index == -1 || co->index >= NR_PORTS)
706        co->index = 0;
707    uart = &ubi32_mailbox_ports[co->index];
708
709# ifdef CONFIG_SERIAL_UBI32_MAILBOX_CONSOLE
710    if (options)
711        uart_parse_options(options, &baud, &parity, &bits, &flow);
712    else
713        ubi32_mailbox_console_get_options(uart, &baud, &parity, &bits);
714
715    //JB return uart_set_options(&uart->port, co, baud, parity, bits, flow);
716    return 0;
717# else
718    return 0;
719# endif
720}
721#endif /* defined (CONFIG_SERIAL_UBI32_MAILBOX_CONSOLE) ||
722                 defined (CONFIG_EARLY_PRINTK) */
723
724#ifdef CONFIG_SERIAL_UBI32_MAILBOX_CONSOLE
725static void ubi32_mailbox_console_putchar(struct uart_port *port, int ch)
726{
727// struct ubi32_mailbox_port *uart = (struct ubi32_mailbox_port *)port;
728    while (!(UART_GET_LSR(uart) & THRE))
729        barrier();
730    UART_PUT_CHAR(uart, ch);
731    SSYNC();
732}
733
734/*
735 * Interrupts are disabled on entering
736 */
737static void
738ubi32_mailbox_console_write(struct console *co, const char *s, unsigned int count)
739{
740    struct ubi32_mailbox_port *uart = &ubi32_mailbox_ports[co->index];
741    unsigned long flags = 0;
742
743    spin_lock_irqsave(&uart->port.lock, flags);
744    uart_console_write(&uart->port, s, count, ubi32_mailbox_console_putchar);
745    spin_unlock_irqrestore(&uart->port.lock, flags);
746
747}
748
749static struct console ubi32_mailbox_console = {
750    .name = UBI32_MAILBOX_NAME,
751    .write = ubi32_mailbox_console_write,
752    .device = uart_console_device,
753    .setup = ubi32_mailbox_console_setup,
754    .flags = CON_PRINTBUFFER,
755    .index = -1,
756    .data = &ubi32_mailbox_reg,
757};
758
759static int __init ubi32_mailbox_console_init(void)
760{
761    ubi32_mailbox_init_ports();
762    register_console(&ubi32_mailbox_console);
763    return 0;
764}
765console_initcall(ubi32_mailbox_console_init);
766
767#define UBI32_MAILBOX_CONSOLE &ubi32_mailbox_console
768#else
769#define UBI32_MAILBOX_CONSOLE NULL
770#endif /* CONFIG_SERIAL_UBI32_MAILBOX_CONSOLE */
771
772
773#ifdef CONFIG_EARLY_PRINTK
774static __init void ubi32_mailbox_early_putc(struct uart_port *port, int ch)
775{
776    UART_PUT_CHAR(uart, ch);
777}
778
779static __init void ubi32_mailbox_early_write(struct console *con, const char *s,
780                    unsigned int n)
781{
782    struct ubi32_mailbox_port *uart = &ubi32_mailbox_ports[con->index];
783    unsigned int i;
784
785    for (i = 0; i < n; i++, s++) {
786        if (*s == '\n')
787            ubi32_mailbox_early_putc(&uart->port, '\r');
788        ubi32_mailbox_early_putc(&uart->port, *s);
789    }
790}
791
792static struct __init console ubi32_mailbox_early_console = {
793    .name = "early_UM",
794    .write = ubi32_mailbox_early_write,
795    .device = uart_console_device,
796    .flags = CON_PRINTBUFFER,
797    .setup = ubi32_mailbox_console_setup,
798    .index = -1,
799    .data = &ubi32_mailbox_reg,
800};
801
802/*
803 * XXX Unused in our driver. Need to find out what the termios initialization is good/needed for.
804 */
805struct console __init *ubi32_mailbox_early_init(unsigned int port,
806                        unsigned int cflag)
807{
808    struct ubi32_mailbox_port *uart;
809    struct ktermios t;
810
811    if (port == -1 || port >= NR_PORTS)
812        port = 0;
813    ubi32_mailbox_init_ports();
814    ubi32_mailbox_early_console.index = port;
815    uart = &ubi32_mailbox_ports[port];
816    t.c_cflag = cflag;
817    t.c_iflag = 0;
818    t.c_oflag = 0;
819    t.c_lflag = ICANON;
820    t.c_line = port;
821    ubi32_mailbox_set_termios(&uart->port, &t, &t);
822    return &ubi32_mailbox_early_console;
823}
824
825#endif /* CONFIG_SERIAL_UBI32_MAILBOX_CONSOLE */
826
827static struct uart_driver ubi32_mailbox_reg = {
828    .owner = THIS_MODULE,
829    .driver_name = "ubi32_mailbox",
830    .dev_name = UBI32_MAILBOX_NAME,
831    .major = UBI32_MAILBOX_MAJOR,
832    .minor = UBI32_MAILBOX_MINOR,
833    .nr = NR_PORTS,
834    .cons = UBI32_MAILBOX_CONSOLE,
835};
836
837static int ubi32_mailbox_suspend(struct platform_device *dev, pm_message_t state)
838{
839    struct ubi32_mailbox_port *uart = platform_get_drvdata(dev);
840
841    if (uart)
842        uart_suspend_port(&ubi32_mailbox_reg, &uart->port);
843
844    return 0;
845}
846
847static int ubi32_mailbox_resume(struct platform_device *dev)
848{
849    struct ubi32_mailbox_port *uart = platform_get_drvdata(dev);
850
851    if (uart)
852        uart_resume_port(&ubi32_mailbox_reg, &uart->port);
853
854    return 0;
855}
856
857static int ubi32_mailbox_probe(struct platform_device *dev)
858{
859    struct resource *res = dev->resource;
860    int i;
861
862    for (i = 0; i < dev->num_resources; i++, res++)
863        if (res->flags & IORESOURCE_MEM)
864            break;
865
866    if (i < dev->num_resources) {
867        for (i = 0; i < NR_PORTS; i++, res++) {
868            if (ubi32_mailbox_ports[i].port.mapbase != res->start)
869                continue;
870            ubi32_mailbox_ports[i].port.dev = &dev->dev;
871            uart_add_one_port(&ubi32_mailbox_reg, &ubi32_mailbox_ports[i].port);
872            platform_set_drvdata(dev, &ubi32_mailbox_ports[i]);
873        }
874    }
875
876    return 0;
877}
878
879static int ubi32_mailbox_remove(struct platform_device *pdev)
880{
881    struct ubi32_mailbox_port *uart = platform_get_drvdata(pdev);
882
883    platform_set_drvdata(pdev, NULL);
884
885    if (uart)
886        uart_remove_one_port(&ubi32_mailbox_reg, &uart->port);
887
888    return 0;
889}
890
891static struct platform_driver ubi32_mailbox_driver = {
892    .probe = ubi32_mailbox_probe,
893    .remove = ubi32_mailbox_remove,
894    .suspend = ubi32_mailbox_suspend,
895    .resume = ubi32_mailbox_resume,
896    .driver = {
897        .name = "ubi32-mbox",
898        .owner = THIS_MODULE,
899    },
900};
901
902static int __init ubi32_mailbox_init(void)
903{
904    int ret;
905
906    pr_info("Serial: Ubicom32 mailbox serial driver.\n");
907
908    mailbox_console_flg = TRUE;
909    num_timeouts = 0;
910    ubi32_mailbox_init_ports();
911
912    ret = uart_register_driver(&ubi32_mailbox_reg);
913    if (ret == 0) {
914        ret = platform_driver_register(&ubi32_mailbox_driver);
915        if (ret) {
916            pr_debug("uart register failed\n");
917            uart_unregister_driver(&ubi32_mailbox_reg);
918        }
919    }
920
921    /*
922     * XXX HACK: currently probe does not get called, but the port needs to be added to work.
923     */
924    uart_add_one_port(&ubi32_mailbox_reg, &ubi32_mailbox_ports[0].port);
925    return ret;
926}
927
928static void __exit ubi32_mailbox_exit(void)
929{
930    platform_driver_unregister(&ubi32_mailbox_driver);
931    uart_unregister_driver(&ubi32_mailbox_reg);
932}
933
934module_init(ubi32_mailbox_init);
935module_exit(ubi32_mailbox_exit);
936
937MODULE_ALIAS_CHARDEV_MAJOR(UBI32_MAILBOX_MAJOR);
938MODULE_ALIAS("platform:ubi32_mailbox");
939

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