xref: /openbmc/u-boot/board/ti/beagle/beagle.c (revision a380279b)
1 /*
2  * (C) Copyright 2004-2008
3  * Texas Instruments, <www.ti.com>
4  *
5  * Author :
6  *	Sunil Kumar <sunilsaini05@gmail.com>
7  *	Shashi Ranjan <shashiranjanmca05@gmail.com>
8  *
9  * Derived from Beagle Board and 3430 SDP code by
10  *	Richard Woodruff <r-woodruff2@ti.com>
11  *	Syed Mohammed Khasim <khasim@ti.com>
12  *
13  *
14  * See file CREDITS for list of people who contributed to this
15  * project.
16  *
17  * This program is free software; you can redistribute it and/or
18  * modify it under the terms of the GNU General Public License as
19  * published by the Free Software Foundation; either version 2 of
20  * the License, or (at your option) any later version.
21  *
22  * This program is distributed in the hope that it will be useful,
23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25  * GNU General Public License for more details.
26  *
27  * You should have received a copy of the GNU General Public License
28  * along with this program; if not, write to the Free Software
29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30  * MA 02111-1307 USA
31  */
32 #include <common.h>
33 #include <twl4030.h>
34 #include <asm/io.h>
35 #include <asm/arch/mux.h>
36 #include <asm/arch/sys_proto.h>
37 #include <asm/arch/gpio.h>
38 #include <asm/mach-types.h>
39 #include "beagle.h"
40 
41 static int beagle_revision_c;
42 
43 /*
44  * Routine: board_init
45  * Description: Early hardware init.
46  */
47 int board_init(void)
48 {
49 	DECLARE_GLOBAL_DATA_PTR;
50 
51 	gpmc_init(); /* in SRAM or SDRAM, finish GPMC */
52 	/* board id for Linux */
53 	gd->bd->bi_arch_number = MACH_TYPE_OMAP3_BEAGLE;
54 	/* boot param addr */
55 	gd->bd->bi_boot_params = (OMAP34XX_SDRC_CS0 + 0x100);
56 
57 	return 0;
58 }
59 
60 /*
61  * Routine: beagle_get_revision
62  * Description: Return the revision of the BeagleBoard this code is running on.
63  *              If it is a revision Ax/Bx board, this function returns 0,
64  *              on a revision C board you will get a 1.
65  */
66 int beagle_get_revision(void)
67 {
68 	return beagle_revision_c;
69 }
70 
71 /*
72  * Routine: beagle_identify
73  * Description: Detect if we are running on a Beagle revision Ax/Bx or
74  *              Cx. This can be done by GPIO_171. If this is low, we are
75  *              running on a revision C board.
76  */
77 void beagle_identify(void)
78 {
79 	beagle_revision_c = 0;
80 	if (!omap_request_gpio(171)) {
81 		unsigned int val;
82 
83 		omap_set_gpio_direction(171, 1);
84 		val = omap_get_gpio_datain(171);
85 		omap_free_gpio(171);
86 
87 		if (val)
88 			beagle_revision_c = 0;
89 		else
90 			beagle_revision_c = 1;
91 	}
92 
93 	printf("Board revision ");
94 	if (beagle_revision_c)
95 		printf("C\n");
96 	else
97 		printf("Ax/Bx\n");
98 }
99 
100 /*
101  * Routine: misc_init_r
102  * Description: Configure board specific parts
103  */
104 int misc_init_r(void)
105 {
106 	struct gpio *gpio5_base = (struct gpio *)OMAP34XX_GPIO5_BASE;
107 	struct gpio *gpio6_base = (struct gpio *)OMAP34XX_GPIO6_BASE;
108 
109 	twl4030_power_init();
110 	twl4030_led_init();
111 
112 	/* Configure GPIOs to output */
113 	writel(~(GPIO23 | GPIO10 | GPIO8 | GPIO2 | GPIO1), &gpio6_base->oe);
114 	writel(~(GPIO31 | GPIO30 | GPIO29 | GPIO28 | GPIO22 | GPIO21 |
115 		GPIO15 | GPIO14 | GPIO13 | GPIO12), &gpio5_base->oe);
116 
117 	/* Set GPIOs */
118 	writel(GPIO23 | GPIO10 | GPIO8 | GPIO2 | GPIO1,
119 		&gpio6_base->setdataout);
120 	writel(GPIO31 | GPIO30 | GPIO29 | GPIO28 | GPIO22 | GPIO21 |
121 		GPIO15 | GPIO14 | GPIO13 | GPIO12, &gpio5_base->setdataout);
122 
123 	beagle_identify();
124 
125 	dieid_num_r();
126 
127 	return 0;
128 }
129 
130 /*
131  * Routine: set_muxconf_regs
132  * Description: Setting up the configuration Mux registers specific to the
133  *		hardware. Many pins need to be moved from protect to primary
134  *		mode.
135  */
136 void set_muxconf_regs(void)
137 {
138 	MUX_BEAGLE();
139 
140 	if (beagle_revision_c) {
141 		MUX_BEAGLE_C();
142 	}
143 }
144