1 /*
2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <arch.h>
8 #include <assert.h>
9 #include <cci.h>
10 #include <debug.h>
11 #include <mmio.h>
12 #include <stdint.h>
13
14 #define MAKE_CCI_PART_NUMBER(hi, lo) ((hi << 8) | lo)
15 #define CCI_PART_LO_MASK 0xff
16 #define CCI_PART_HI_MASK 0xf
17
18 /* CCI part number codes read from Peripheral ID registers 0 and 1 */
19 #define CCI400_PART_NUM 0x420
20 #define CCI500_PART_NUM 0x422
21 #define CCI550_PART_NUM 0x423
22
23 #define CCI400_SLAVE_PORTS 5
24 #define CCI500_SLAVE_PORTS 7
25 #define CCI550_SLAVE_PORTS 7
26
27 static uintptr_t cci_base;
28 static const int *cci_slave_if_map;
29
30 #if ENABLE_ASSERTIONS
31 static unsigned int max_master_id;
32 static int cci_num_slave_ports;
33
validate_cci_map(const int * map)34 static int validate_cci_map(const int *map)
35 {
36 unsigned int valid_cci_map = 0;
37 int slave_if_id;
38 int i;
39
40 /* Validate the map */
41 for (i = 0; i <= max_master_id; i++) {
42 slave_if_id = map[i];
43
44 if (slave_if_id < 0)
45 continue;
46
47 if (slave_if_id >= cci_num_slave_ports) {
48 ERROR("Slave interface ID is invalid\n");
49 return 0;
50 }
51
52 if (valid_cci_map & (1 << slave_if_id)) {
53 ERROR("Multiple masters are assigned same slave interface ID\n");
54 return 0;
55 }
56 valid_cci_map |= 1 << slave_if_id;
57 }
58
59 if (!valid_cci_map) {
60 ERROR("No master is assigned a valid slave interface\n");
61 return 0;
62 }
63
64 return 1;
65 }
66
67 /*
68 * Read CCI part number from Peripheral ID registers
69 */
read_cci_part_number(uintptr_t base)70 static unsigned int read_cci_part_number(uintptr_t base)
71 {
72 unsigned int part_lo, part_hi;
73
74 part_lo = mmio_read_32(base + PERIPHERAL_ID0) & CCI_PART_LO_MASK;
75 part_hi = mmio_read_32(base + PERIPHERAL_ID1) & CCI_PART_HI_MASK;
76
77 return MAKE_CCI_PART_NUMBER(part_hi, part_lo);
78 }
79
80 /*
81 * Identify a CCI device, and return the number of slaves. Return -1 for an
82 * unidentified device.
83 */
get_slave_ports(unsigned int part_num)84 static int get_slave_ports(unsigned int part_num)
85 {
86 /* Macro to match CCI products */
87 #define RET_ON_MATCH(product) \
88 case CCI ## product ## _PART_NUM: \
89 return CCI ## product ## _SLAVE_PORTS
90
91 switch (part_num) {
92
93 RET_ON_MATCH(400);
94 RET_ON_MATCH(500);
95 RET_ON_MATCH(550);
96
97 default:
98 return -1;
99 }
100
101 #undef RET_ON_MATCH
102 }
103 #endif /* ENABLE_ASSERTIONS */
104
cci_init(uintptr_t base,const int * map,unsigned int num_cci_masters)105 void cci_init(uintptr_t base, const int *map, unsigned int num_cci_masters)
106 {
107 assert(map);
108 assert(base);
109
110 cci_base = base;
111 cci_slave_if_map = map;
112
113 #if ENABLE_ASSERTIONS
114 /*
115 * Master Id's are assigned from zero, So in an array of size n
116 * the max master id is (n - 1).
117 */
118 max_master_id = num_cci_masters - 1;
119 cci_num_slave_ports = get_slave_ports(read_cci_part_number(base));
120 #endif
121 assert(cci_num_slave_ports >= 0);
122
123 assert(validate_cci_map(map));
124 }
125
cci_enable_snoop_dvm_reqs(unsigned int master_id)126 void cci_enable_snoop_dvm_reqs(unsigned int master_id)
127 {
128 int slave_if_id = cci_slave_if_map[master_id];
129
130 assert(master_id <= max_master_id);
131 assert((slave_if_id < cci_num_slave_ports) && (slave_if_id >= 0));
132 assert(cci_base);
133
134 /*
135 * Enable Snoops and DVM messages, no need for Read/Modify/Write as
136 * rest of bits are write ignore
137 */
138 mmio_write_32(cci_base +
139 SLAVE_IFACE_OFFSET(slave_if_id) + SNOOP_CTRL_REG,
140 DVM_EN_BIT | SNOOP_EN_BIT);
141
142 /* Wait for the dust to settle down */
143 while (mmio_read_32(cci_base + STATUS_REG) & CHANGE_PENDING_BIT)
144 ;
145 }
146
cci_disable_snoop_dvm_reqs(unsigned int master_id)147 void cci_disable_snoop_dvm_reqs(unsigned int master_id)
148 {
149 int slave_if_id = cci_slave_if_map[master_id];
150
151 assert(master_id <= max_master_id);
152 assert((slave_if_id < cci_num_slave_ports) && (slave_if_id >= 0));
153 assert(cci_base);
154
155 /*
156 * Disable Snoops and DVM messages, no need for Read/Modify/Write as
157 * rest of bits are write ignore.
158 */
159 mmio_write_32(cci_base +
160 SLAVE_IFACE_OFFSET(slave_if_id) + SNOOP_CTRL_REG,
161 ~(DVM_EN_BIT | SNOOP_EN_BIT));
162
163 /* Wait for the dust to settle down */
164 while (mmio_read_32(cci_base + STATUS_REG) & CHANGE_PENDING_BIT)
165 ;
166 }
167
168