1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2019 Kyle Evans <kevans@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 /* 30 * This file contains facilities for runtime determination of address space 31 * mappings for use in DMA/mailbox interactions. This is only used for the 32 * arm64 SoC because the 32-bit SoC used the same mappings. 33 */ 34 35 #include <sys/types.h> 36 #include <sys/systm.h> 37 38 #include <dev/ofw/openfirm.h> 39 #include <dev/ofw/ofw_bus.h> 40 #include <dev/ofw/ofw_bus_subr.h> 41 42 #include <machine/bus.h> 43 44 #include <arm/broadcom/bcm2835/bcm2835_vcbus.h> 45 46 /* 47 * This structure describes mappings that need to take place when transforming 48 * ARM core addresses into vcbus addresses for use with the DMA/mailbox 49 * interfaces. Currently, we only deal with peripheral/SDRAM address spaces 50 * here. 51 * 52 * The SDRAM address space is consistently mapped starting at 0 and extends to 53 * the size of the installed SDRAM. 54 * 55 * Peripherals are mapped further up at spots that vary per-SOC. 56 */ 57 struct bcm283x_memory_mapping { 58 vm_paddr_t armc_start; 59 vm_paddr_t armc_size; 60 vm_paddr_t vcbus_start; 61 }; 62 63 static struct bcm283x_memory_mapping bcm2835_memmap[] = { 64 { 65 /* SDRAM */ 66 .armc_start = 0x00000000, 67 .armc_size = BCM2835_ARM_IO_BASE, 68 .vcbus_start = BCM2835_VCBUS_SDRAM_BASE, 69 }, 70 { 71 /* Peripherals */ 72 .armc_start = BCM2835_ARM_IO_BASE, 73 .armc_size = BCM28XX_ARM_IO_SIZE, 74 .vcbus_start = BCM2835_VCBUS_IO_BASE, 75 }, 76 { 0, 0, 0 }, 77 }; 78 79 static struct bcm283x_memory_mapping bcm2836_memmap[] = { 80 { 81 /* SDRAM */ 82 .armc_start = 0x00000000, 83 .armc_size = BCM2836_ARM_IO_BASE, 84 .vcbus_start = BCM2836_VCBUS_SDRAM_BASE, 85 }, 86 { 87 /* Peripherals */ 88 .armc_start = BCM2836_ARM_IO_BASE, 89 .armc_size = BCM28XX_ARM_IO_SIZE, 90 .vcbus_start = BCM2836_VCBUS_IO_BASE, 91 }, 92 { 0, 0, 0 }, 93 }; 94 95 static struct bcm283x_memory_mapping bcm2837_memmap[] = { 96 { 97 /* SDRAM */ 98 .armc_start = 0x00000000, 99 .armc_size = BCM2837_ARM_IO_BASE, 100 .vcbus_start = BCM2837_VCBUS_SDRAM_BASE, 101 }, 102 { 103 /* Peripherals */ 104 .armc_start = BCM2837_ARM_IO_BASE, 105 .armc_size = BCM28XX_ARM_IO_SIZE, 106 .vcbus_start = BCM2837_VCBUS_IO_BASE, 107 }, 108 { 0, 0, 0 }, 109 }; 110 111 /* 112 * The BCM2838 supports up to 4GB of SDRAM, but unfortunately we can still only 113 * map the first 1GB into the "legacy master view" (vcbus) address space. Thus, 114 * peripherals can still only access the lower end of SDRAM. For this reason, 115 * we also capture the main-peripheral busdma restriction below. 116 */ 117 static struct bcm283x_memory_mapping bcm2838_memmap[] = { 118 { 119 /* SDRAM */ 120 .armc_start = 0x00000000, 121 .armc_size = 0x40000000, 122 .vcbus_start = BCM2838_VCBUS_SDRAM_BASE, 123 }, 124 { 125 /* Main peripherals */ 126 .armc_start = BCM2838_ARM_IO_BASE, 127 .armc_size = BCM28XX_ARM_IO_SIZE, 128 .vcbus_start = BCM2838_VCBUS_IO_BASE, 129 }, 130 { 0, 0, 0 }, 131 }; 132 133 static struct bcm283x_memory_soc_cfg { 134 struct bcm283x_memory_mapping *memmap; 135 const char *soc_compat; 136 bus_addr_t busdma_lowaddr; 137 } bcm283x_memory_configs[] = { 138 /* Legacy */ 139 { 140 .memmap = bcm2835_memmap, 141 .soc_compat = "raspberrypi,model-b", 142 .busdma_lowaddr = BUS_SPACE_MAXADDR_32BIT, 143 }, 144 /* Modern */ 145 { 146 .memmap = bcm2835_memmap, 147 .soc_compat = "brcm,bcm2835", 148 .busdma_lowaddr = BUS_SPACE_MAXADDR_32BIT, 149 }, 150 /* Legacy */ 151 { 152 .memmap = bcm2836_memmap, 153 .soc_compat = "brcm,bcm2709", 154 .busdma_lowaddr = BUS_SPACE_MAXADDR_32BIT, 155 }, 156 /* Modern */ 157 { 158 .memmap = bcm2836_memmap, 159 .soc_compat = "brcm,bcm2836", 160 .busdma_lowaddr = BUS_SPACE_MAXADDR_32BIT, 161 }, 162 { 163 .memmap = bcm2837_memmap, 164 .soc_compat = "brcm,bcm2837", 165 .busdma_lowaddr = BUS_SPACE_MAXADDR_32BIT, 166 }, 167 { 168 .memmap = bcm2838_memmap, 169 .soc_compat = "brcm,bcm2711", 170 .busdma_lowaddr = BCM2838_PERIPH_MAXADDR, 171 }, 172 { 173 .memmap = bcm2838_memmap, 174 .soc_compat = "brcm,bcm2838", 175 .busdma_lowaddr = BCM2838_PERIPH_MAXADDR, 176 }, 177 }; 178 179 static struct bcm283x_memory_soc_cfg *booted_soc_memcfg; 180 181 static struct bcm283x_memory_soc_cfg * 182 bcm283x_get_current_memcfg(void) 183 { 184 phandle_t root; 185 int i; 186 187 /* We'll cache it once we decide, because it won't change per-boot. */ 188 if (booted_soc_memcfg != NULL) 189 return (booted_soc_memcfg); 190 191 KASSERT(nitems(bcm283x_memory_configs) != 0, 192 ("No SOC memory configurations enabled!")); 193 194 root = OF_finddevice("/"); 195 for (i = 0; i < nitems(bcm283x_memory_configs); ++i) { 196 booted_soc_memcfg = &bcm283x_memory_configs[i]; 197 if (bootverbose) 198 printf("Checking root against %s\n", 199 booted_soc_memcfg->soc_compat); 200 if (ofw_bus_node_is_compatible(root, 201 booted_soc_memcfg->soc_compat)) 202 return (booted_soc_memcfg); 203 } 204 205 /* 206 * The kernel doesn't fit the board; we can't really make a reasonable 207 * guess, as these SOC are different enough that something will blow up 208 * later. 209 */ 210 panic("No suitable SOC memory configuration found."); 211 } 212 213 #define BCM283X_MEMMAP_ISTERM(ent) \ 214 ((ent)->armc_start == 0 && (ent)->armc_size == 0 && \ 215 (ent)->vcbus_start == 0) 216 217 vm_paddr_t 218 bcm283x_armc_to_vcbus(vm_paddr_t pa) 219 { 220 struct bcm283x_memory_soc_cfg *cfg; 221 struct bcm283x_memory_mapping *map, *ment; 222 223 /* Guaranteed not NULL if we haven't panicked yet. */ 224 cfg = bcm283x_get_current_memcfg(); 225 map = cfg->memmap; 226 for (ment = map; !BCM283X_MEMMAP_ISTERM(ment); ++ment) { 227 if (pa >= ment->armc_start && 228 pa < ment->armc_start + ment->armc_size) { 229 return (pa - ment->armc_start) + ment->vcbus_start; 230 } 231 } 232 233 /* 234 * Assume 1:1 mapping for anything else, but complain about it on 235 * verbose boots. 236 */ 237 if (bootverbose) 238 printf("bcm283x_vcbus: No armc -> vcbus mapping found: %jx\n", 239 (uintmax_t)pa); 240 return (pa); 241 } 242 243 vm_paddr_t 244 bcm283x_vcbus_to_armc(vm_paddr_t vca) 245 { 246 struct bcm283x_memory_soc_cfg *cfg; 247 struct bcm283x_memory_mapping *map, *ment; 248 249 /* Guaranteed not NULL if we haven't panicked yet. */ 250 cfg = bcm283x_get_current_memcfg(); 251 map = cfg->memmap; 252 for (ment = map; !BCM283X_MEMMAP_ISTERM(ment); ++ment) { 253 if (vca >= ment->vcbus_start && 254 vca < ment->vcbus_start + ment->armc_size) { 255 return (vca - ment->vcbus_start) + ment->armc_start; 256 } 257 } 258 259 /* 260 * Assume 1:1 mapping for anything else, but complain about it on 261 * verbose boots. 262 */ 263 if (bootverbose) 264 printf("bcm283x_vcbus: No vcbus -> armc mapping found: %jx\n", 265 (uintmax_t)vca); 266 return (vca); 267 } 268 269 bus_addr_t 270 bcm283x_dmabus_peripheral_lowaddr(void) 271 { 272 struct bcm283x_memory_soc_cfg *cfg; 273 274 cfg = bcm283x_get_current_memcfg(); 275 return (cfg->busdma_lowaddr); 276 } 277