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  * This code is licensed under the GNU GPLv2 and later.
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include "qapi/error.h"
  13 #include "qemu-common.h"
  14 #include "cpu.h"
  15 #include "hw/arm/bcm2835.h"
  16 #include "hw/arm/bcm2836.h"
  17 #include "qemu/error-report.h"
  18 #include "hw/boards.h"
  19 #include "hw/loader.h"
  20 #include "hw/arm/arm.h"
  21 #include "sysemu/sysemu.h"
  22
  23 #define SMPBOOT_ADDR    0x300 /* this should leave enough space for ATAGS */
  24 #define MVBAR_ADDR      0x400 /* secure vectors */
  25 #define BOARDSETUP_ADDR (MVBAR_ADDR + 0x20) /* board setup code */
  26 #define FIRMWARE_ADDR   0x8000 /* Pi loads kernel.img here by default */
  27
  28 /* Table of Linux board IDs for different Pi versions */
  29 static const int raspi_boardid[] = {[1] = 0xc42, [2] = 0xc43};
  30
  31 /* Table of board revisions
  32  * https://github.com/AndrewFromMelbourne/raspberry_pi_revision/blob/master/README.md
  33  */
  34 static const uint32_t raspi_boardrev[] = {[1] = 0x10, [2] = 0xa21041};
  35
  36 typedef struct RasPiState {
  37     Object *soc;
  38     MemoryRegion ram;
  39 } RasPiState;
  40
  41 static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info)
  42 {
  43     static const uint32_t smpboot[] = {
  44         0xe1a0e00f, /*    mov     lr, pc */
  45         0xe3a0fe00 + (BOARDSETUP_ADDR >> 4), /* mov pc, BOARDSETUP_ADDR */
  46         0xee100fb0, /*    mrc     p15, 0, r0, c0, c0, 5;get core ID */
  47         0xe7e10050, /*    ubfx    r0, r0, #0, #2       ;extract LSB */
  48         0xe59f5014, /*    ldr     r5, =0x400000CC      ;load mbox base */
  49         0xe320f001, /* 1: yield */
  50         0xe7953200, /*    ldr     r3, [r5, r0, lsl #4] ;read mbox for our core*/
  51         0xe3530000, /*    cmp     r3, #0               ;spin while zero */
  52         0x0afffffb, /*    beq     1b */
  53         0xe7853200, /*    str     r3, [r5, r0, lsl #4] ;clear mbox */
  54         0xe12fff13, /*    bx      r3                   ;jump to target */
  55         0x400000cc, /* (constant: mailbox 3 read/clear base) */
  56     };
  57
  58     /* check that we don't overrun board setup vectors */
  59     QEMU_BUILD_BUG_ON(SMPBOOT_ADDR + sizeof(smpboot) > MVBAR_ADDR);
  60     /* check that board setup address is correctly relocated */
  61     QEMU_BUILD_BUG_ON((BOARDSETUP_ADDR & 0xf) != 0
  62                       || (BOARDSETUP_ADDR >> 4) >= 0x100);
  63
  64     rom_add_blob_fixed("raspi_smpboot", smpboot, sizeof(smpboot),
  65                        info->smp_loader_start);
  66 }
  67
  68 static void write_board_setup(ARMCPU *cpu, const struct arm_boot_info *info)
  69 {
  70     arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR);
  71 }
  72
  73 static void reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info)
  74 {
  75     CPUState *cs = CPU(cpu);
  76     cpu_set_pc(cs, info->smp_loader_start);
  77 }
  78
  79 static void setup_boot(MachineState *machine, int version, size_t ram_size)
  80 {
  81     static struct arm_boot_info binfo;
  82     int r;
  83
  84     binfo.board_id = raspi_boardid[version];
  85     binfo.ram_size = ram_size;
  86     binfo.nb_cpus = smp_cpus;
  87     binfo.board_setup_addr = BOARDSETUP_ADDR;
  88     binfo.write_board_setup = write_board_setup;
  89     binfo.secure_board_setup = true;
  90     binfo.secure_boot = true;
  91
  92     /* Pi2 requires SMP setup */
  93     if (version == 2) {
  94         binfo.smp_loader_start = SMPBOOT_ADDR;
  95         binfo.write_secondary_boot = write_smpboot;
  96         binfo.secondary_cpu_reset_hook = reset_secondary;
  97     }
  98
  99     /* If the user specified a "firmware" image (e.g. UEFI), we bypass
 100      * the normal Linux boot process
 101      */
 102     if (machine->firmware) {
 103         /* load the firmware image (typically kernel.img) */
 104         r = load_image_targphys(machine->firmware, FIRMWARE_ADDR,
 105                                 ram_size - FIRMWARE_ADDR);
 106         if (r < 0) {
 107             error_report("Failed to load firmware from %s", machine->firmware);
 108             exit(1);
 109         }
 110
 111         binfo.entry = FIRMWARE_ADDR;
 112         binfo.firmware_loaded = true;
 113     } else {
 114         binfo.kernel_filename = machine->kernel_filename;
 115         binfo.kernel_cmdline = machine->kernel_cmdline;
 116         binfo.initrd_filename = machine->initrd_filename;
 117     }
 118
 119     arm_load_kernel(ARM_CPU(first_cpu), &binfo);
 120 }
 121
 122 static void raspi_machine_init(MachineState *machine, int version,
 123                                const char *soc_type)
 124 {
 125     RasPiState *s = g_new0(RasPiState, 1);
 126     uint32_t vcram_size;
 127     DriveInfo *di;
 128     BlockBackend *blk;
 129     BusState *bus;
 130     DeviceState *carddev;
 131
 132     /* Initialise the relevant SOC */
 133     s->soc = object_new(soc_type);
 134     object_property_add_child(OBJECT(machine), "soc", s->soc, &error_abort);
 135
 136     /* Allocate and map RAM */
 137     memory_region_allocate_system_memory(&s->ram, OBJECT(machine), "ram",
 138                                          machine->ram_size);
 139     /* FIXME: Remove when we have custom CPU address space support */
 140     memory_region_add_subregion_overlap(get_system_memory(), 0, &s->ram, 0);
 141
 142     /* Setup the SOC */
 143     object_property_add_const_link(s->soc, "ram", OBJECT(&s->ram),
 144                                    &error_abort);
 145
 146     object_property_set_int(s->soc, raspi_boardrev[version], "board-rev",
 147                             &error_abort);
 148
 149     if (version == 2) {
 150         object_property_set_int(s->soc, smp_cpus, "enabled-cpus", &error_abort);
 151     }
 152
 153     object_property_set_bool(s->soc, true, "realized", &error_abort);
 154
 155     /* Create and plug in the SD cards */
 156     di = drive_get_next(IF_SD);
 157     blk = di ? blk_by_legacy_dinfo(di) : NULL;
 158     bus = qdev_get_child_bus(DEVICE(s->soc), "sd-bus");
 159     if (bus == NULL) {
 160         error_report("No SD bus found in SOC object");
 161         exit(1);
 162     }
 163     carddev = qdev_create(bus, TYPE_SD_CARD);
 164     qdev_prop_set_drive(carddev, "drive", blk, &error_fatal);
 165     object_property_set_bool(OBJECT(carddev), true, "realized", &error_fatal);
 166
 167     vcram_size = object_property_get_uint(OBJECT(&s->soc), "vcram-size",
 168                                           &error_abort);
 169     setup_boot(machine, 2, machine->ram_size - vcram_size);
 170 }
 171
 172 static void raspi1_init(MachineState *machine)
 173 {
 174     raspi_machine_init(machine, 1, TYPE_BCM2835);
 175 }
 176
 177 static void raspi2_init(MachineState *machine)
 178 {
 179     raspi_machine_init(machine, 2, TYPE_BCM2836);
 180 }
 181
 182 static void raspi1_machine_init(MachineClass *mc)
 183 {
 184     mc->desc = "Raspberry Pi";
 185     mc->init = raspi1_init;
 186     mc->block_default_type = IF_SD;
 187     mc->no_parallel = 1;
 188     mc->no_floppy = 1;
 189     mc->no_cdrom = 1;
 190     mc->default_ram_size = 512 * 1024 * 1024;
 191 };
 192 DEFINE_MACHINE("raspi", raspi1_machine_init)
 193
 194 static void raspi2_machine_init(MachineClass *mc)
 195 {
 196     raspi1_machine_init(mc);
 197     mc->desc = "Raspberry Pi 2";
 198     mc->init = raspi2_init;
 199     mc->max_cpus = BCM2836_NCPUS;
 200     mc->min_cpus = BCM2836_NCPUS;
 201     mc->default_cpus = BCM2836_NCPUS;
 202     mc->default_ram_size = 1024 * 1024 * 1024;
 203     mc->ignore_memory_transaction_failures = true;
 204 };
 205 DEFINE_MACHINE("raspi2", raspi2_machine_init)