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 37 static unsigned long g_cci_base; 38 static unsigned int g_max_master_id; 39 static const int *g_cci_slave_if_map; 40 41 #if DEBUG 42 static int validate_cci_map(const int *map) 43 { 44 unsigned int valid_cci_map = 0; 45 int slave_if_id; 46 int i; 47 48 /* Validate the map */ 49 for (i = 0; i <= g_max_master_id; i++) { 50 slave_if_id = map[i]; 51 52 if (slave_if_id < 0) 53 continue; 54 55 if (slave_if_id >= CCI_SLAVE_INTERFACE_COUNT) { 56 tf_printf("Slave interface ID is invalid\n"); 57 return 0; 58 } 59 60 if (valid_cci_map & (1 << slave_if_id)) { 61 tf_printf("Multiple masters are assigned same" 62 " slave interface ID\n"); 63 return 0; 64 } 65 valid_cci_map |= 1 << slave_if_id; 66 } 67 68 if (!valid_cci_map) { 69 tf_printf("No master is assigned a valid slave interface\n"); 70 return 0; 71 } 72 73 return 1; 74 } 75 #endif /* DEBUG */ 76 77 void cci_init(unsigned long cci_base, 78 const int *map, 79 unsigned int num_cci_masters) 80 { 81 assert(map); 82 assert(cci_base); 83 84 g_cci_base = cci_base; 85 86 /* 87 * Master Id's are assigned from zero, So in an array of size n 88 * the max master id is (n - 1). 89 */ 90 g_max_master_id = num_cci_masters - 1; 91 92 assert(validate_cci_map(map)); 93 g_cci_slave_if_map = map; 94 } 95 96 void cci_enable_snoop_dvm_reqs(unsigned int master_id) 97 { 98 int slave_if_id; 99 100 assert(g_cci_base); 101 assert(master_id <= g_max_master_id); 102 103 slave_if_id = g_cci_slave_if_map[master_id]; 104 assert((slave_if_id < CCI_SLAVE_INTERFACE_COUNT) && (slave_if_id >= 0)); 105 106 /* 107 * Enable Snoops and DVM messages, no need for Read/Modify/Write as 108 * rest of bits are write ignore 109 */ 110 mmio_write_32(g_cci_base + 111 SLAVE_IFACE_OFFSET(slave_if_id) + 112 SNOOP_CTRL_REG, DVM_EN_BIT | SNOOP_EN_BIT); 113 114 /* Wait for the dust to settle down */ 115 while (mmio_read_32(g_cci_base + STATUS_REG) & CHANGE_PENDING_BIT) 116 ; 117 } 118 119 void cci_disable_snoop_dvm_reqs(unsigned int master_id) 120 { 121 int slave_if_id; 122 123 assert(g_cci_base); 124 assert(master_id <= g_max_master_id); 125 126 slave_if_id = g_cci_slave_if_map[master_id]; 127 assert((slave_if_id < CCI_SLAVE_INTERFACE_COUNT) && (slave_if_id >= 0)); 128 129 /* 130 * Disable Snoops and DVM messages, no need for Read/Modify/Write as 131 * rest of bits are write ignore. 132 */ 133 mmio_write_32(g_cci_base + 134 SLAVE_IFACE_OFFSET(slave_if_id) + 135 SNOOP_CTRL_REG, ~(DVM_EN_BIT | SNOOP_EN_BIT)); 136 137 /* Wait for the dust to settle down */ 138 while (mmio_read_32(g_cci_base + STATUS_REG) & CHANGE_PENDING_BIT) 139 ; 140 } 141 142