1 /* 2 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <arch.h> 32 #include <assert.h> 33 #include <cci.h> 34 #include <debug.h> 35 #include <mmio.h> 36 #include <stdint.h> 37 38 static uintptr_t g_cci_base; 39 static unsigned int g_max_master_id; 40 static const int *g_cci_slave_if_map; 41 42 #if DEBUG 43 static int validate_cci_map(const int *map) 44 { 45 unsigned int valid_cci_map = 0; 46 int slave_if_id; 47 int i; 48 49 /* Validate the map */ 50 for (i = 0; i <= g_max_master_id; i++) { 51 slave_if_id = map[i]; 52 53 if (slave_if_id < 0) 54 continue; 55 56 if (slave_if_id >= CCI_SLAVE_INTERFACE_COUNT) { 57 tf_printf("Slave interface ID is invalid\n"); 58 return 0; 59 } 60 61 if (valid_cci_map & (1 << slave_if_id)) { 62 tf_printf("Multiple masters are assigned same" 63 " slave interface ID\n"); 64 return 0; 65 } 66 valid_cci_map |= 1 << slave_if_id; 67 } 68 69 if (!valid_cci_map) { 70 tf_printf("No master is assigned a valid slave interface\n"); 71 return 0; 72 } 73 74 return 1; 75 } 76 #endif /* DEBUG */ 77 78 void cci_init(uintptr_t cci_base, 79 const int *map, 80 unsigned int num_cci_masters) 81 { 82 assert(map); 83 assert(cci_base); 84 85 g_cci_base = cci_base; 86 87 /* 88 * Master Id's are assigned from zero, So in an array of size n 89 * the max master id is (n - 1). 90 */ 91 g_max_master_id = num_cci_masters - 1; 92 93 assert(validate_cci_map(map)); 94 g_cci_slave_if_map = map; 95 } 96 97 void cci_enable_snoop_dvm_reqs(unsigned int master_id) 98 { 99 int slave_if_id; 100 101 assert(g_cci_base); 102 assert(master_id <= g_max_master_id); 103 104 slave_if_id = g_cci_slave_if_map[master_id]; 105 assert((slave_if_id < CCI_SLAVE_INTERFACE_COUNT) && (slave_if_id >= 0)); 106 107 /* 108 * Enable Snoops and DVM messages, no need for Read/Modify/Write as 109 * rest of bits are write ignore 110 */ 111 mmio_write_32(g_cci_base + 112 SLAVE_IFACE_OFFSET(slave_if_id) + 113 SNOOP_CTRL_REG, DVM_EN_BIT | SNOOP_EN_BIT); 114 115 /* Wait for the dust to settle down */ 116 while (mmio_read_32(g_cci_base + STATUS_REG) & CHANGE_PENDING_BIT) 117 ; 118 } 119 120 void cci_disable_snoop_dvm_reqs(unsigned int master_id) 121 { 122 int slave_if_id; 123 124 assert(g_cci_base); 125 assert(master_id <= g_max_master_id); 126 127 slave_if_id = g_cci_slave_if_map[master_id]; 128 assert((slave_if_id < CCI_SLAVE_INTERFACE_COUNT) && (slave_if_id >= 0)); 129 130 /* 131 * Disable Snoops and DVM messages, no need for Read/Modify/Write as 132 * rest of bits are write ignore. 133 */ 134 mmio_write_32(g_cci_base + 135 SLAVE_IFACE_OFFSET(slave_if_id) + 136 SNOOP_CTRL_REG, ~(DVM_EN_BIT | SNOOP_EN_BIT)); 137 138 /* Wait for the dust to settle down */ 139 while (mmio_read_32(g_cci_base + STATUS_REG) & CHANGE_PENDING_BIT) 140 ; 141 } 142 143