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      1 /*	$NetBSD: console.c,v 1.3 2016/10/05 15:54:58 ryo Exp $	*/
      2 /*-
      3  * Copyright (c) 2011 CradlePoint Technology, Inc.
      4  * All rights reserved.
      5  *
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY CRADLEPOINT TECHNOLOGY, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: console.c,v 1.3 2016/10/05 15:54:58 ryo Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/systm.h>
     34 #include <sys/types.h>
     35 
     36 #include <dev/cons.h>
     37 
     38 #include <mips/ralink/ralink_reg.h>
     39 #include <mips/ralink/ralink_var.h>
     40 
     41 #ifndef RALINK_CONADDR
     42 #define RALINK_CONADDR	RA_UART_LITE_BASE	/* default console is UART_LITE */
     43 #endif
     44 
     45 static inline uint32_t
     46 sysctl_read(const u_int offset)
     47 {
     48 	return *RA_IOREG_VADDR(RA_SYSCTL_BASE, offset);
     49 }
     50 
     51 static inline void
     52 sysctl_write(const u_int offset, uint32_t val)
     53 {
     54 	*RA_IOREG_VADDR(RA_SYSCTL_BASE, offset) = val;
     55 }
     56 
     57 static inline uint32_t
     58 uart_read(const u_int offset)
     59 {
     60 	return *RA_IOREG_VADDR(RALINK_CONADDR, offset);
     61 }
     62 
     63 static inline void
     64 uart_write(const u_int offset, const uint32_t val)
     65 {
     66 	*RA_IOREG_VADDR(RALINK_CONADDR, offset) = val;
     67 }
     68 
     69 #ifdef RA_CONSOLE_EARLY
     70 static void
     71 ra_console_putc(dev_t dev, int c)
     72 {
     73 	u_int timo;
     74 
     75 	timo = 150000;
     76 	do {
     77 		if ((uart_read(RA_UART_LSR) & UART_LSR_TDRQ) != 0)
     78 			break;
     79 	} while(--timo != 0);
     80 
     81 	uart_write(RA_UART_TBR, c);
     82 	if (c == '\n')
     83 		ra_console_putc (dev, '\r');
     84 #if 1
     85 	timo = 150000;
     86 	do {
     87 		if ((uart_read(RA_UART_LSR) & UART_LSR_TEMT) != 0)
     88 			break;
     89 	} while(--timo != 0);
     90 #endif
     91 }
     92 
     93 static int
     94 ra_console_getc(dev_t dev)
     95 {
     96 	while ((uart_read(RA_UART_LSR) & UART_LSR_DR) == 0)
     97 		;
     98 	return (char)(uart_read(RA_UART_RBR) & 0xff);
     99 }
    100 
    101 static void
    102 ra_console_flush(dev_t dev)
    103 {
    104 	while ((uart_read(RA_UART_LSR) & UART_LSR_TEMT) == 0)
    105 		;
    106 }
    107 
    108 void
    109 ra_console_early(void)
    110 {
    111 	uint32_t r;
    112 
    113 	/* reset */
    114 	r = sysctl_read(RA_SYSCTL_RST);
    115 	r |= RST_UARTL;
    116 	sysctl_write(RA_SYSCTL_RST, r);
    117 	r ^= RST_UARTL;
    118 	sysctl_write(RA_SYSCTL_RST, r);
    119 
    120 	/* make sure we are in UART mode */
    121 	r = sysctl_read(RA_SYSCTL_GPIOMODE);
    122 	r &= ~GPIOMODE_UARTL;
    123 	sysctl_write(RA_SYSCTL_GPIOMODE, r);
    124 
    125 	uart_write(RA_UART_IER, 0);		/* disable interrupts */
    126 	uart_write(RA_UART_FCR, 0);		/* disable fifos */
    127 
    128 	/* set baud rate */
    129 	uart_write(RA_UART_LCR,
    130 		UART_LCR_WLS0 | UART_LCR_WLS1 | UART_LCR_DLAB);
    131 	uart_write(RA_UART_DLL,
    132 		(RA_UART_FREQ / RA_SERIAL_CLKDIV / RA_BAUDRATE)
    133 			& 0xffff);
    134 	uart_write(RA_UART_LCR,
    135 		UART_LCR_WLS0 | UART_LCR_WLS1);
    136 
    137 	static struct consdev lite_cn = {
    138 	    .cn_probe = NULL,
    139 	    .cn_init = NULL,
    140 	    .cn_getc = ra_console_getc,
    141 	    .cn_putc = ra_console_putc,
    142 	    .cn_pollc = nullcnpollc,
    143 	    .cn_bell = NULL,
    144 	    .cn_halt = NULL,
    145 	    .cn_flush = ra_console_flush,
    146 	    .cn_dev = makedev(0, 0),
    147 	    .cn_pri = CN_DEAD,
    148 	};
    149 
    150 	cn_tab = &lite_cn;
    151 
    152 }
    153 #endif	/* RA_CONSOLE_EARLY */
    154 
    155 void
    156 consinit(void)
    157 {
    158 	if (ra_check_memo_reg(SERIAL_CONSOLE)) {
    159 		ralink_com_early(0);
    160 		printf("Enabled early console\n");
    161 	} else {
    162 		/*
    163 		 * this should be OK, but our shell configuration doesn't seem
    164 		 * to be working, so create a silent console
    165 		 */
    166 		cn_tab = NULL;
    167 		ralink_com_early(1);
    168 		printf("Enabled silent console\n");
    169 	}
    170 
    171 #if 0
    172 	/* update ddb escape sequence to '~~' to avoid the undocking issue */
    173 	cn_set_magic("\x7E\x7E");
    174 #endif
    175 }
    176