xref: /openbmc/u-boot/board/freescale/common/cadmus.c (revision e2a53458)
1 /*
2  * Copyright 2004, 2011 Freescale Semiconductor.
3  *
4  * See file CREDITS for list of people who contributed to this
5  * project.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as
9  * published by the Free Software Foundation; either version 2 of
10  * the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20  * MA 02111-1307 USA
21  */
22 
23 
24 #include <common.h>
25 
26 
27 /*
28  * CADMUS Board System Registers
29  */
30 #ifndef CONFIG_SYS_CADMUS_BASE_REG
31 #define CONFIG_SYS_CADMUS_BASE_REG	(CADMUS_BASE_ADDR + 0x4000)
32 #endif
33 
34 typedef struct cadmus_reg {
35     u_char cm_ver;		/* Board version */
36     u_char cm_csr;		/* General control/status */
37     u_char cm_rst;		/* Reset control */
38     u_char cm_hsclk;		/* High speed clock */
39     u_char cm_hsxclk;		/* High speed clock extended */
40     u_char cm_led;		/* LED data */
41     u_char cm_pci;		/* PCI control/status */
42     u_char cm_dma;		/* DMA control */
43     u_char cm_reserved[248];	/* Total 256 bytes */
44 } cadmus_reg_t;
45 
46 
47 unsigned int
48 get_board_version(void)
49 {
50 	volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
51 
52 	return cadmus->cm_ver;
53 }
54 
55 
56 unsigned long
57 get_clock_freq(void)
58 {
59 	volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
60 
61 	uint pci1_speed = (cadmus->cm_pci >> 2) & 0x3; /* PSPEED in [4:5] */
62 
63 	if (pci1_speed == 0) {
64 		return 33333333;
65 	} else if (pci1_speed == 1) {
66 		return 66666666;
67 	} else {
68 		/* Really, unknown. Be safe? */
69 		return 33333333;
70 	}
71 }
72 
73 
74 unsigned int
75 get_pci_slot(void)
76 {
77 	volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
78 
79 	/*
80 	 * PCI slot in USER bits CSR[6:7] by convention.
81 	 */
82 	return ((cadmus->cm_csr >> 6) & 0x3) + 1;
83 }
84 
85 
86 unsigned int
87 get_pci_dual(void)
88 {
89 	volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
90 
91 	/*
92 	 * PCI DUAL in CM_PCI[3]
93 	 */
94 	return cadmus->cm_pci & 0x10;
95 }
96