1 /*
2 * Copyright (c) 2011 Aeroflex Gaisler
3 *
4 * BSD license:
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25
26 #include <asm-leon/leon.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30
31 /*#define DEBUG_CONFIG*/
32
33 /* Structure containing address to devices found on the Amba Plug&Play bus */
34 amba_confarea_type amba_conf;
35
36 /* Pointers to Interrupt Controller configuration registers */
37 volatile LEON3_IrqCtrl_Regs_Map *LEON3_IrqCtrl_Regs = 0;
38 volatile LEON3_GpTimer_Regs_Map *LEON3_GpTimer_Regs = 0;
39 unsigned long LEON3_GpTimer_Irq = 0;
40
41 unsigned long
amba_find_apbslv_addr(unsigned long vendor,unsigned long device,unsigned long * irq)42 amba_find_apbslv_addr (unsigned long vendor, unsigned long device,
43 unsigned long *irq)
44 {
45 unsigned int i, conf, iobar;
46 for (i = 0; i < amba_conf.apbslv.devnr; i++)
47 {
48 conf = amba_get_confword (amba_conf.apbslv, i, 0);
49 if ((amba_vendor (conf) == vendor) && (amba_device (conf) == device))
50 {
51 if (irq)
52 {
53 *irq = amba_irq (conf);
54 }
55 iobar = amba_apb_get_membar (amba_conf.apbslv, i);
56 return amba_iobar_start (amba_conf.apbslv.apbmst[i], iobar);
57 }
58 }
59 return 0;
60 }
61
62 #define amba_insert_device(tab, address) do { \
63 if (LEON3_BYPASS_LOAD_PA(address)) { \
64 (tab)->addr[(tab)->devnr] = (address); \
65 (tab)->devnr ++; \
66 } \
67 } while(0)
68
69 #define amba_insert_apb_device(tab, address, apbmst, idx) do { \
70 if (*(address)) { \
71 (tab)->addr[(tab)->devnr] = (address); \
72 (tab)->apbmst[(tab)->devnr] = (apbmst); \
73 (tab)->apbmstidx[(tab)->devnr] = (idx); \
74 (tab)->devnr ++; \
75 } \
76 } while(0)
77
78 /*
79 * Used to scan system bus. Probes for AHB masters, AHB slaves and
80 * APB slaves. Addresses to configuration areas of the AHB masters,
81 * AHB slaves, APB slaves and APB master are storeds in
82 * amba_ahb_masters, amba_ahb_slaves and amba.
83 */
84
85 int amba_init_done = 0;
86
87 void
amba_init(void)88 amba_init (void)
89 {
90 unsigned int *cfg_area; /* address to configuration area */
91 unsigned int mbar, conf, apbmst;
92 int i, j, idx = 0;
93
94 if (amba_init_done)
95 {
96 return;
97 }
98 amba_init_done = 1;
99
100 memset (&amba_conf, 0, sizeof (amba_conf));
101 /*amba_conf.ahbmst.devnr = 0; amba_conf.ahbslv.devnr = 0; amba_conf.apbslv.devnr = 0; */
102
103 cfg_area = (unsigned int *) (LEON3_IO_AREA | LEON3_CONF_AREA);
104
105 for (i = 0; i < LEON3_AHB_MASTERS; i++)
106 {
107 amba_insert_device (&amba_conf.ahbmst, cfg_area);
108 cfg_area += LEON3_AHB_CONF_WORDS;
109 }
110
111 cfg_area =
112 (unsigned int *) (LEON3_IO_AREA | LEON3_CONF_AREA |
113 LEON3_AHB_SLAVE_CONF_AREA);
114 for (i = 0; i < LEON3_AHB_SLAVES; i++)
115 {
116 amba_insert_device (&amba_conf.ahbslv, cfg_area);
117 cfg_area += LEON3_AHB_CONF_WORDS;
118 }
119
120 for (i = 0; i < amba_conf.ahbslv.devnr; i++)
121 {
122 conf = amba_get_confword (amba_conf.ahbslv, i, 0);
123 mbar = amba_ahb_get_membar (amba_conf.ahbslv, i, 0);
124 if ((amba_vendor (conf) == VENDOR_GAISLER)
125 && (amba_device (conf) == GAISLER_APBMST))
126 {
127 int k;
128 /*amba_conf.apbmst = */ apbmst = amba_membar_start (mbar);
129 cfg_area = (unsigned int *) (apbmst | LEON3_CONF_AREA);
130
131 for (j = amba_conf.apbslv.devnr, k = 0;
132 j < AMBA_MAXAPB_DEVS && k < AMBA_MAXAPB_DEVS_PERBUS; j++, k++)
133 {
134 amba_insert_apb_device (&amba_conf.apbslv, cfg_area, apbmst,
135 idx);
136 cfg_area += LEON3_APB_CONF_WORDS;
137 }
138 idx++;
139 }
140 }
141
142 /* Find LEON3 Interrupt controler */
143 LEON3_IrqCtrl_Regs = (volatile LEON3_IrqCtrl_Regs_Map *)
144 amba_find_apbslv_addr (VENDOR_GAISLER, GAISLER_IRQMP, 0);
145 LEON3_GpTimer_Regs = (volatile LEON3_GpTimer_Regs_Map *)
146 amba_find_apbslv_addr (VENDOR_GAISLER, GAISLER_GPTIMER,
147 &LEON3_GpTimer_Irq);
148 if (LEON3_IrqCtrl_Regs)
149 {
150 LEON3_BYPASS_STORE_PA (&(LEON3_IrqCtrl_Regs->mask[0]), 0);
151 }
152 }
153