2 * Copyright (c) 2012, 2013 The FreeBSD Foundation
5 * This software was developed by Oleksandr Rybalko under sponsorship
6 * from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
30 /* Simple UART console driver for Freescale i.MX515 */
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/types.h>
36 #include <sys/param.h>
37 #include <sys/systm.h>
39 #include <sys/consio.h>
40 #include <sys/kernel.h>
42 /* Allow it to be predefined, to be able to use another UART for console */
44 #define IMX_UART_BASE 0xe3fbc000 /* imx51 UART1 */
52 #define IMX_USR1_TRDY (1 << 13)
55 #define IMX_USR2_RDR (1 << 0)
56 #define IMX_USR2_TXFE (1 << 14)
57 #define IMX_USR2_TXDC (1 << 3)
60 #define IMX_UTS_TXFULL (1 << 4)
63 * The base address of the uart registers.
65 * This is global so that it can be changed on the fly from the outside. For
66 * example, set imx_uart_base=physaddr and then call cninit() as the first two
67 * lines of initarm() and enjoy printf() availability through the tricky bits of
68 * startup. After initarm() switches from physical to virtual addressing, just
69 * set imx_uart_base=virtaddr and printf keeps working.
71 uint32_t imx_uart_base = IMX_UART_BASE;
77 ub_getreg(uint32_t off)
80 return *((volatile uint32_t *)(imx_uart_base + off));
84 ub_setreg(uint32_t off, uint32_t val)
87 *((volatile uint32_t *)(imx_uart_base + off)) = val;
94 return ((ub_getreg(IMX_USR2) & IMX_USR2_RDR) ? 1 : 0);
102 __asm __volatile("nop");
104 return (ub_getreg(IMX_RXD) & 0xff);
108 ub_putc(unsigned char c)
114 while (ub_getreg(IMX_UTS) & IMX_UTS_TXFULL)
115 __asm __volatile("nop");
117 ub_setreg(IMX_TXD, c);
120 static cn_probe_t uart_cnprobe;
121 static cn_init_t uart_cninit;
122 static cn_term_t uart_cnterm;
123 static cn_getc_t uart_cngetc;
124 static cn_putc_t uart_cnputc;
125 static cn_grab_t uart_cngrab;
126 static cn_ungrab_t uart_cnungrab;
129 uart_cngrab(struct consdev *cp)
135 uart_cnungrab(struct consdev *cp)
142 uart_cnprobe(struct consdev *cp)
145 sprintf(cp->cn_name, "uart");
146 cp->cn_pri = CN_NORMAL;
150 uart_cninit(struct consdev *cp)
153 /* Init fifo trigger levels to 32 bytes, refclock div to 2. */
154 ub_setreg(IMX_UFCR, 0x00004210);
158 uart_cnputc(struct consdev *cp, int c)
165 uart_cngetc(struct consdev * cp)
172 uart_cnterm(struct consdev * cp)
177 CONSOLE_DRIVER(uart);