xref: /openbmc/u-boot/board/freescale/common/cadmus.c (revision e8f80a5a)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2004, 2011 Freescale Semiconductor.
4  */
5 
6 
7 #include <common.h>
8 
9 
10 /*
11  * CADMUS Board System Registers
12  */
13 #ifndef CONFIG_SYS_CADMUS_BASE_REG
14 #define CONFIG_SYS_CADMUS_BASE_REG	(CADMUS_BASE_ADDR + 0x4000)
15 #endif
16 
17 typedef struct cadmus_reg {
18     u_char cm_ver;		/* Board version */
19     u_char cm_csr;		/* General control/status */
20     u_char cm_rst;		/* Reset control */
21     u_char cm_hsclk;		/* High speed clock */
22     u_char cm_hsxclk;		/* High speed clock extended */
23     u_char cm_led;		/* LED data */
24     u_char cm_pci;		/* PCI control/status */
25     u_char cm_dma;		/* DMA control */
26     u_char cm_reserved[248];	/* Total 256 bytes */
27 } cadmus_reg_t;
28 
29 
30 unsigned int
get_board_version(void)31 get_board_version(void)
32 {
33 	volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
34 
35 	return cadmus->cm_ver;
36 }
37 
38 
39 unsigned long
get_clock_freq(void)40 get_clock_freq(void)
41 {
42 	volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
43 
44 	uint pci1_speed = (cadmus->cm_pci >> 2) & 0x3; /* PSPEED in [4:5] */
45 
46 	if (pci1_speed == 0) {
47 		return 33333333;
48 	} else if (pci1_speed == 1) {
49 		return 66666666;
50 	} else {
51 		/* Really, unknown. Be safe? */
52 		return 33333333;
53 	}
54 }
55 
56 
57 unsigned int
get_pci_slot(void)58 get_pci_slot(void)
59 {
60 	volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
61 
62 	/*
63 	 * PCI slot in USER bits CSR[6:7] by convention.
64 	 */
65 	return ((cadmus->cm_csr >> 6) & 0x3) + 1;
66 }
67 
68 
69 unsigned int
get_pci_dual(void)70 get_pci_dual(void)
71 {
72 	volatile cadmus_reg_t *cadmus = (cadmus_reg_t *)CONFIG_SYS_CADMUS_BASE_REG;
73 
74 	/*
75 	 * PCI DUAL in CM_PCI[3]
76 	 */
77 	return cadmus->cm_pci & 0x10;
78 }
79