1 /*
2 * Copyright (C) 2018 Marvell International Ltd.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 * https://spdx.org/licenses
6 */
7
8 /* AXI to M-Bridge decoding unit driver for Marvell Armada 8K and 8K+ SoCs */
9
10 #include <common/debug.h>
11 #include <lib/mmio.h>
12
13 #include <armada_common.h>
14 #include <mvebu.h>
15 #include <mvebu_def.h>
16
17 #if LOG_LEVEL >= LOG_LEVEL_INFO
18 #define DEBUG_ADDR_MAP
19 #endif
20
21 /* common defines */
22 #define WIN_ENABLE_BIT (0x1)
23
24 #define MVEBU_AMB_ADEC_OFFSET (0x70ff00)
25
26 #define AMB_WIN_CR_OFFSET(win) (amb_base + 0x0 + (0x8 * win))
27 #define AMB_ATTR_OFFSET 8
28 #define AMB_ATTR_MASK 0xFF
29 #define AMB_SIZE_OFFSET 16
30 #define AMB_SIZE_MASK 0xFF
31
32 #define AMB_WIN_BASE_OFFSET(win) (amb_base + 0x4 + (0x8 * win))
33 #define AMB_BASE_OFFSET 16
34 #define AMB_BASE_ADDR_MASK ((1 << (32 - AMB_BASE_OFFSET)) - 1)
35
36 #define AMB_WIN_ALIGNMENT_64K (0x10000)
37 #define AMB_WIN_ALIGNMENT_1M (0x100000)
38
39 uintptr_t amb_base;
40
amb_check_win(struct addr_map_win * win,uint32_t win_num)41 static void amb_check_win(struct addr_map_win *win, uint32_t win_num)
42 {
43 uint32_t base_addr;
44
45 /* make sure the base address is in 16-bit range */
46 if (win->base_addr > AMB_BASE_ADDR_MASK) {
47 WARN("Window %d: base address is too big 0x%llx\n",
48 win_num, win->base_addr);
49 win->base_addr = AMB_BASE_ADDR_MASK;
50 WARN("Set the base address to 0x%llx\n", win->base_addr);
51 }
52
53 base_addr = win->base_addr << AMB_BASE_OFFSET;
54 /* for AMB The base is always 1M aligned */
55 /* check if address is aligned to 1M */
56 if (IS_NOT_ALIGN(base_addr, AMB_WIN_ALIGNMENT_1M)) {
57 win->base_addr = ALIGN_UP(base_addr, AMB_WIN_ALIGNMENT_1M);
58 WARN("Window %d: base address unaligned to 0x%x\n",
59 win_num, AMB_WIN_ALIGNMENT_1M);
60 WARN("Align up the base address to 0x%llx\n", win->base_addr);
61 }
62
63 /* size parameter validity check */
64 if (!IS_POWER_OF_2(win->win_size)) {
65 WARN("Window %d: window size is not power of 2 (0x%llx)\n",
66 win_num, win->win_size);
67 win->win_size = ROUND_UP_TO_POW_OF_2(win->win_size);
68 WARN("Rounding size to 0x%llx\n", win->win_size);
69 }
70 }
71
amb_enable_win(struct addr_map_win * win,uint32_t win_num)72 static void amb_enable_win(struct addr_map_win *win, uint32_t win_num)
73 {
74 uint32_t ctrl, base, size;
75
76 /*
77 * size is 64KB granularity.
78 * The number of ones specifies the size of the
79 * window in 64 KB granularity. 0 is 64KB
80 */
81 size = (win->win_size / AMB_WIN_ALIGNMENT_64K) - 1;
82 ctrl = (size << AMB_SIZE_OFFSET) | (win->target_id << AMB_ATTR_OFFSET);
83 base = win->base_addr << AMB_BASE_OFFSET;
84
85 mmio_write_32(AMB_WIN_BASE_OFFSET(win_num), base);
86 mmio_write_32(AMB_WIN_CR_OFFSET(win_num), ctrl);
87
88 /* enable window after configuring window size (and attributes) */
89 ctrl |= WIN_ENABLE_BIT;
90 mmio_write_32(AMB_WIN_CR_OFFSET(win_num), ctrl);
91 }
92
93 #ifdef DEBUG_ADDR_MAP
dump_amb_adec(void)94 static void dump_amb_adec(void)
95 {
96 uint32_t ctrl, base, win_id, attr;
97 uint32_t size, size_count;
98
99 /* Dump all AMB windows */
100 printf("bank attribute base size\n");
101 printf("--------------------------------------------\n");
102 for (win_id = 0; win_id < AMB_MAX_WIN_ID; win_id++) {
103 ctrl = mmio_read_32(AMB_WIN_CR_OFFSET(win_id));
104 if (ctrl & WIN_ENABLE_BIT) {
105 base = mmio_read_32(AMB_WIN_BASE_OFFSET(win_id));
106 attr = (ctrl >> AMB_ATTR_OFFSET) & AMB_ATTR_MASK;
107 size_count = (ctrl >> AMB_SIZE_OFFSET) & AMB_SIZE_MASK;
108 size = (size_count + 1) * AMB_WIN_ALIGNMENT_64K;
109 printf("amb 0x%04x 0x%08x 0x%08x\n",
110 attr, base, size);
111 }
112 }
113 }
114 #endif
115
init_amb_adec(uintptr_t base)116 int init_amb_adec(uintptr_t base)
117 {
118 struct addr_map_win *win;
119 uint32_t win_id, win_reg;
120 uint32_t win_count;
121
122 INFO("Initializing AXI to MBus Bridge Address decoding\n");
123
124 /* Get the base address of the AMB address decoding */
125 amb_base = base + MVEBU_AMB_ADEC_OFFSET;
126
127 /* Get the array of the windows and its size */
128 marvell_get_amb_memory_map(&win, &win_count, base);
129 if (win_count <= 0)
130 INFO("no windows configurations found\n");
131
132 if (win_count > AMB_MAX_WIN_ID) {
133 INFO("number of windows is bigger than %d\n", AMB_MAX_WIN_ID);
134 return 0;
135 }
136
137 /* disable all AMB windows */
138 for (win_id = 0; win_id < AMB_MAX_WIN_ID; win_id++) {
139 win_reg = mmio_read_32(AMB_WIN_CR_OFFSET(win_id));
140 win_reg &= ~WIN_ENABLE_BIT;
141 mmio_write_32(AMB_WIN_CR_OFFSET(win_id), win_reg);
142 }
143
144 /* enable relevant windows */
145 for (win_id = 0; win_id < win_count; win_id++, win++) {
146 amb_check_win(win, win_id);
147 amb_enable_win(win, win_id);
148 }
149
150 #ifdef DEBUG_ADDR_MAP
151 dump_amb_adec();
152 #endif
153
154 INFO("Done AXI to MBus Bridge Address decoding Initializing\n");
155
156 return 0;
157 }
158