hw/arm/raspi.c

   1 /*
   2  * Raspberry Pi emulation (c) 2012 Gregory Estrade
   3  * Upstreaming code cleanup [including bcm2835_*] (c) 2013 Jan Petrous
   4  *
   5  * Rasperry Pi 2 emulation Copyright (c) 2015, Microsoft
   6  * Written by Andrew Baumann
   7  *
   8  * Raspberry Pi 3 emulation Copyright (c) 2018 Zoltán Baldaszti
   9  * Upstream code cleanup (c) 2018 Pekka Enberg
  10  *
  11  * This code is licensed under the GNU GPLv2 and later.
  12  */
  13
  14 #include "qemu/osdep.h"
  15 #include "qapi/error.h"
  16 #include "qemu-common.h"
  17 #include "cpu.h"
  18 #include "hw/arm/bcm2836.h"
  19 #include "qemu/error-report.h"
  20 #include "hw/boards.h"
  21 #include "hw/loader.h"
  22 #include "hw/arm/arm.h"
  23 #include "sysemu/sysemu.h"
  24
  25 #define SMPBOOT_ADDR    0x300 /* this should leave enough space for ATAGS */
  26 #define MVBAR_ADDR      0x400 /* secure vectors */
  27 #define BOARDSETUP_ADDR (MVBAR_ADDR + 0x20) /* board setup code */
  28 #define FIRMWARE_ADDR_2 0x8000 /* Pi 2 loads kernel.img here by default */
  29 #define FIRMWARE_ADDR_3 0x80000 /* Pi 3 loads kernel.img here by default */
  30
  31 /* Table of Linux board IDs for different Pi versions */
  32 static const int raspi_boardid[] = {[1] = 0xc42, [2] = 0xc43, [3] = 0xc44};
  33
  34 typedef struct RasPiState {
  35     BCM283XState soc;
  36     MemoryRegion ram;
  37 } RasPiState;
  38
  39 static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info)
  40 {
  41     static const uint32_t smpboot[] = {
  42         0xe1a0e00f, /*    mov     lr, pc */
  43         0xe3a0fe00 + (BOARDSETUP_ADDR >> 4), /* mov pc, BOARDSETUP_ADDR */
  44         0xee100fb0, /*    mrc     p15, 0, r0, c0, c0, 5;get core ID */
  45         0xe7e10050, /*    ubfx    r0, r0, #0, #2       ;extract LSB */
  46         0xe59f5014, /*    ldr     r5, =0x400000CC      ;load mbox base */
  47         0xe320f001, /* 1: yield */
  48         0xe7953200, /*    ldr     r3, [r5, r0, lsl #4] ;read mbox for our core*/
  49         0xe3530000, /*    cmp     r3, #0               ;spin while zero */
  50         0x0afffffb, /*    beq     1b */
  51         0xe7853200, /*    str     r3, [r5, r0, lsl #4] ;clear mbox */
  52         0xe12fff13, /*    bx      r3                   ;jump to target */
  53         0x400000cc, /* (constant: mailbox 3 read/clear base) */
  54     };
  55
  56     /* check that we don't overrun board setup vectors */
  57     QEMU_BUILD_BUG_ON(SMPBOOT_ADDR + sizeof(smpboot) > MVBAR_ADDR);
  58     /* check that board setup address is correctly relocated */
  59     QEMU_BUILD_BUG_ON((BOARDSETUP_ADDR & 0xf) != 0
  60                       || (BOARDSETUP_ADDR >> 4) >= 0x100);
  61
  62     rom_add_blob_fixed("raspi_smpboot", smpboot, sizeof(smpboot),
  63                        info->smp_loader_start);
  64 }
  65
  66 static void write_board_setup(ARMCPU *cpu, const struct arm_boot_info *info)
  67 {
  68     arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR);
  69 }
  70
  71 static void reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info)
  72 {
  73     CPUState *cs = CPU(cpu);
  74     cpu_set_pc(cs, info->smp_loader_start);
  75 }
  76
  77 static void setup_boot(MachineState *machine, int version, size_t ram_size)
  78 {
  79     static struct arm_boot_info binfo;
  80     int r;
  81
  82     binfo.board_id = raspi_boardid[version];
  83     binfo.ram_size = ram_size;
  84     binfo.nb_cpus = smp_cpus;
  85
  86     if (version <= 2) {
  87         /* The rpi1 and 2 require some custom setup code to run in Secure
  88          * mode before booting a kernel (to set up the SMC vectors so
  89          * that we get a no-op SMC; this is used by Linux to call the
  90          * firmware for some cache maintenance operations.
  91          * The rpi3 doesn't need this.
  92          */
  93         binfo.board_setup_addr = BOARDSETUP_ADDR;
  94         binfo.write_board_setup = write_board_setup;
  95         binfo.secure_board_setup = true;
  96         binfo.secure_boot = true;
  97     }
  98
  99     /* Pi2 and Pi3 requires SMP setup */
 100     if (version >= 2) {
 101         binfo.smp_loader_start = SMPBOOT_ADDR;
 102         binfo.write_secondary_boot = write_smpboot;
 103         binfo.secondary_cpu_reset_hook = reset_secondary;
 104     }
 105
 106     /* If the user specified a "firmware" image (e.g. UEFI), we bypass
 107      * the normal Linux boot process
 108      */
 109     if (machine->firmware) {
 110         hwaddr firmware_addr = version == 3 ? FIRMWARE_ADDR_3 : FIRMWARE_ADDR_2;
 111         /* load the firmware image (typically kernel.img) */
 112         r = load_image_targphys(machine->firmware, firmware_addr,
 113                                 ram_size - firmware_addr);
 114         if (r < 0) {
 115             error_report("Failed to load firmware from %s", machine->firmware);
 116             exit(1);
 117         }
 118
 119         binfo.entry = firmware_addr;
 120         binfo.firmware_loaded = true;
 121     } else {
 122         binfo.kernel_filename = machine->kernel_filename;
 123         binfo.kernel_cmdline = machine->kernel_cmdline;
 124         binfo.initrd_filename = machine->initrd_filename;
 125     }
 126
 127     arm_load_kernel(ARM_CPU(first_cpu), &binfo);
 128 }
 129
 130 static void raspi_init(MachineState *machine, int version)
 131 {
 132     RasPiState *s = g_new0(RasPiState, 1);
 133     uint32_t vcram_size;
 134     DriveInfo *di;
 135     BlockBackend *blk;
 136     BusState *bus;
 137     DeviceState *carddev;
 138
 139     object_initialize(&s->soc, sizeof(s->soc), TYPE_BCM283X);
 140     object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc),
 141                               &error_abort);
 142
 143     /* Allocate and map RAM */
 144     memory_region_allocate_system_memory(&s->ram, OBJECT(machine), "ram",
 145                                          machine->ram_size);
 146     /* FIXME: Remove when we have custom CPU address space support */
 147     memory_region_add_subregion_overlap(get_system_memory(), 0, &s->ram, 0);
 148
 149     /* Setup the SOC */
 150     object_property_add_const_link(OBJECT(&s->soc), "ram", OBJECT(&s->ram),
 151                                    &error_abort);
 152     object_property_set_str(OBJECT(&s->soc), machine->cpu_type, "cpu-type",
 153                             &error_abort);
 154     object_property_set_int(OBJECT(&s->soc), smp_cpus, "enabled-cpus",
 155                             &error_abort);
 156     int board_rev = version == 3 ? 0xa02082 : 0xa21041;
 157     object_property_set_int(OBJECT(&s->soc), board_rev, "board-rev",
 158                             &error_abort);
 159     object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_abort);
 160
 161     /* Create and plug in the SD cards */
 162     di = drive_get_next(IF_SD);
 163     blk = di ? blk_by_legacy_dinfo(di) : NULL;
 164     bus = qdev_get_child_bus(DEVICE(&s->soc), "sd-bus");
 165     if (bus == NULL) {
 166         error_report("No SD bus found in SOC object");
 167         exit(1);
 168     }
 169     carddev = qdev_create(bus, TYPE_SD_CARD);
 170     qdev_prop_set_drive(carddev, "drive", blk, &error_fatal);
 171     object_property_set_bool(OBJECT(carddev), true, "realized", &error_fatal);
 172
 173     vcram_size = object_property_get_uint(OBJECT(&s->soc), "vcram-size",
 174                                           &error_abort);
 175     setup_boot(machine, version, machine->ram_size - vcram_size);
 176 }
 177
 178 static void raspi2_init(MachineState *machine)
 179 {
 180     raspi_init(machine, 2);
 181 }
 182
 183 static void raspi2_machine_init(MachineClass *mc)
 184 {
 185     mc->desc = "Raspberry Pi 2";
 186     mc->init = raspi2_init;
 187     mc->block_default_type = IF_SD;
 188     mc->no_parallel = 1;
 189     mc->no_floppy = 1;
 190     mc->no_cdrom = 1;
 191     mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-a15");
 192     mc->max_cpus = BCM283X_NCPUS;
 193     mc->min_cpus = BCM283X_NCPUS;
 194     mc->default_cpus = BCM283X_NCPUS;
 195     mc->default_ram_size = 1024 * 1024 * 1024;
 196     mc->ignore_memory_transaction_failures = true;
 197 };
 198 DEFINE_MACHINE("raspi2", raspi2_machine_init)
 199
 200 #ifdef TARGET_AARCH64
 201 static void raspi3_init(MachineState *machine)
 202 {
 203     raspi_init(machine, 3);
 204 }
 205
 206 static void raspi3_machine_init(MachineClass *mc)
 207 {
 208     mc->desc = "Raspberry Pi 3";
 209     mc->init = raspi3_init;
 210     mc->block_default_type = IF_SD;
 211     mc->no_parallel = 1;
 212     mc->no_floppy = 1;
 213     mc->no_cdrom = 1;
 214     mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-a53");
 215     mc->max_cpus = BCM283X_NCPUS;
 216     mc->min_cpus = BCM283X_NCPUS;
 217     mc->default_cpus = BCM283X_NCPUS;
 218     mc->default_ram_size = 1024 * 1024 * 1024;
 219 }
 220 DEFINE_MACHINE("raspi3", raspi3_machine_init)
 221 #endif