The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/allwinner/console.c

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    1 /*-
    2  * Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 /* Simple UART console driver for Allwinner A10 */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/10.2/sys/arm/allwinner/console.c 266337 2014-05-17 18:53:36Z ian $");
   31 
   32 #include <sys/types.h>
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/cons.h>
   36 #include <sys/consio.h>
   37 #include <sys/kernel.h>
   38 
   39 #ifndef A10_UART_BASE
   40 #define A10_UART_BASE   0xe1c28000      /* UART0 */
   41 #endif
   42 
   43 #define REG_SHIFT       2
   44 
   45 #define UART_DLL        0       /* Out: Divisor Latch Low */
   46 #define UART_DLM        1       /* Out: Divisor Latch High */
   47 #define UART_FCR        2       /* Out: FIFO Control Register */
   48 #define UART_LCR        3       /* Out: Line Control Register */
   49 #define UART_MCR        4       /* Out: Modem Control Register */
   50 #define UART_LSR        5       /* In:  Line Status Register */
   51 #define UART_LSR_THRE   0x20    /* Transmit-hold-register empty */
   52 #define UART_LSR_DR     0x01    /* Receiver data ready */
   53 #define UART_MSR        6       /* In:  Modem Status Register */
   54 #define UART_SCR        7       /* I/O: Scratch Register */
   55 
   56 static uint32_t
   57 uart_getreg(uint32_t *bas)
   58 {
   59         return *((volatile uint32_t *)(bas)) & 0xff;
   60 }
   61 
   62 static void
   63 uart_setreg(uint32_t *bas, uint32_t val)
   64 {
   65         *((volatile uint32_t *)(bas)) = val;
   66 }
   67 
   68 static int
   69 ub_getc(void)
   70 {
   71         while ((uart_getreg((uint32_t *)(A10_UART_BASE + 
   72             (UART_LSR << REG_SHIFT))) & UART_LSR_DR) == 0);
   73                 __asm __volatile("nop");
   74 
   75         return (uart_getreg((uint32_t *)A10_UART_BASE) & 0xff);
   76 }
   77 
   78 static void
   79 ub_putc(unsigned char c)
   80 {
   81         if (c == '\n')
   82                 ub_putc('\r');
   83 
   84         while ((uart_getreg((uint32_t *)(A10_UART_BASE + 
   85             (UART_LSR << REG_SHIFT))) & UART_LSR_THRE) == 0)
   86                 __asm __volatile("nop");
   87 
   88         uart_setreg((uint32_t *)A10_UART_BASE, c);
   89 }
   90 
   91 static cn_probe_t       uart_cnprobe;
   92 static cn_init_t        uart_cninit;
   93 static cn_term_t        uart_cnterm;
   94 static cn_getc_t        uart_cngetc;
   95 static cn_putc_t        uart_cnputc;
   96 static cn_grab_t        uart_cngrab;
   97 static cn_ungrab_t      uart_cnungrab;
   98 
   99 static void
  100 uart_cngrab(struct consdev *cp)
  101 {
  102 }
  103 
  104 static void
  105 uart_cnungrab(struct consdev *cp)
  106 {
  107 }
  108 
  109 
  110 static void
  111 uart_cnprobe(struct consdev *cp)
  112 {
  113         sprintf(cp->cn_name, "uart");
  114         cp->cn_pri = CN_NORMAL;
  115 }
  116 
  117 static void
  118 uart_cninit(struct consdev *cp)
  119 {
  120         uart_setreg((uint32_t *)(A10_UART_BASE + 
  121             (UART_FCR << REG_SHIFT)), 0x06);
  122 }
  123 
  124 void
  125 uart_cnputc(struct consdev *cp, int c)
  126 {
  127         ub_putc(c);
  128 }
  129 
  130 int
  131 uart_cngetc(struct consdev * cp)
  132 {
  133         return ub_getc();
  134 }
  135 
  136 static void
  137 uart_cnterm(struct consdev * cp)
  138 {
  139 }
  140 
  141 CONSOLE_DRIVER(uart);
  142 

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