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qemu-patch-raspberry4/hw/arm/raspi.c
Philippe Mathieu-Daudé f5bb124ecf hw/arm/raspi: Extract the RAM size from the board revision 
The board revision encode the amount of RAM. Add a helper
to extract the RAM size, and use it.
Since the amount of RAM is fixed (it is impossible to physically
modify to have more or less RAM), do not allow sizes different
than the one anounced by the manufacturer.

Acked-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20200208165645.15657-5-f4bug@amsat.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-02-13 14:30:51 +00:00

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/*
* Raspberry Pi emulation (c) 2012 Gregory Estrade
* Upstreaming code cleanup [including bcm2835_*] (c) 2013 Jan Petrous
*
* Rasperry Pi 2 emulation Copyright (c) 2015, Microsoft
* Written by Andrew Baumann
*
* Raspberry Pi 3 emulation Copyright (c) 2018 Zoltán Baldaszti
* Upstream code cleanup (c) 2018 Pekka Enberg
*
* This code is licensed under the GNU GPLv2 and later.
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/cutils.h"
#include "qapi/error.h"
#include "cpu.h"
#include "hw/arm/bcm2836.h"
#include "hw/registerfields.h"
#include "qemu/error-report.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "hw/arm/boot.h"
#include "sysemu/sysemu.h"
#define SMPBOOT_ADDR 0x300 /* this should leave enough space for ATAGS */
#define MVBAR_ADDR 0x400 /* secure vectors */
#define BOARDSETUP_ADDR (MVBAR_ADDR + 0x20) /* board setup code */
#define FIRMWARE_ADDR_2 0x8000 /* Pi 2 loads kernel.img here by default */
#define FIRMWARE_ADDR_3 0x80000 /* Pi 3 loads kernel.img here by default */
#define SPINTABLE_ADDR 0xd8 /* Pi 3 bootloader spintable */
/* Registered machine type (matches RPi Foundation bootloader and U-Boot) */
#define MACH_TYPE_BCM2708 3138
typedef struct RasPiState {
BCM283XState soc;
MemoryRegion ram;
} RasPiState;
/*
* Board revision codes:
* www.raspberrypi.org/documentation/hardware/raspberrypi/revision-codes/
*/
FIELD(REV_CODE, REVISION, 0, 4);
FIELD(REV_CODE, TYPE, 4, 8);
FIELD(REV_CODE, PROCESSOR, 12, 4);
FIELD(REV_CODE, MANUFACTURER, 16, 4);
FIELD(REV_CODE, MEMORY_SIZE, 20, 3);
FIELD(REV_CODE, STYLE, 23, 1);
static uint64_t board_ram_size(uint32_t board_rev)
{
assert(FIELD_EX32(board_rev, REV_CODE, STYLE)); /* Only new style */
return 256 * MiB << FIELD_EX32(board_rev, REV_CODE, MEMORY_SIZE);
}
static int board_processor_id(uint32_t board_rev)
{
assert(FIELD_EX32(board_rev, REV_CODE, STYLE)); /* Only new style */
return FIELD_EX32(board_rev, REV_CODE, PROCESSOR);
}
static int board_version(uint32_t board_rev)
{
return board_processor_id(board_rev) + 1;
}
static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info)
{
static const uint32_t smpboot[] = {
0xe1a0e00f, /* mov lr, pc */
0xe3a0fe00 + (BOARDSETUP_ADDR >> 4), /* mov pc, BOARDSETUP_ADDR */
0xee100fb0, /* mrc p15, 0, r0, c0, c0, 5;get core ID */
0xe7e10050, /* ubfx r0, r0, #0, #2 ;extract LSB */
0xe59f5014, /* ldr r5, =0x400000CC ;load mbox base */
0xe320f001, /* 1: yield */
0xe7953200, /* ldr r3, [r5, r0, lsl #4] ;read mbox for our core*/
0xe3530000, /* cmp r3, #0 ;spin while zero */
0x0afffffb, /* beq 1b */
0xe7853200, /* str r3, [r5, r0, lsl #4] ;clear mbox */
0xe12fff13, /* bx r3 ;jump to target */
0x400000cc, /* (constant: mailbox 3 read/clear base) */
};
/* check that we don't overrun board setup vectors */
QEMU_BUILD_BUG_ON(SMPBOOT_ADDR + sizeof(smpboot) > MVBAR_ADDR);
/* check that board setup address is correctly relocated */
QEMU_BUILD_BUG_ON((BOARDSETUP_ADDR & 0xf) != 0
|| (BOARDSETUP_ADDR >> 4) >= 0x100);
rom_add_blob_fixed_as("raspi_smpboot", smpboot, sizeof(smpboot),
info->smp_loader_start,
arm_boot_address_space(cpu, info));
}
static void write_smpboot64(ARMCPU *cpu, const struct arm_boot_info *info)
{
AddressSpace *as = arm_boot_address_space(cpu, info);
/* Unlike the AArch32 version we don't need to call the board setup hook.
* The mechanism for doing the spin-table is also entirely different.
* We must have four 64-bit fields at absolute addresses
* 0xd8, 0xe0, 0xe8, 0xf0 in RAM, which are the flag variables for
* our CPUs, and which we must ensure are zero initialized before
* the primary CPU goes into the kernel. We put these variables inside
* a rom blob, so that the reset for ROM contents zeroes them for us.
*/
static const uint32_t smpboot[] = {
0xd2801b05, /* mov x5, 0xd8 */
0xd53800a6, /* mrs x6, mpidr_el1 */
0x924004c6, /* and x6, x6, #0x3 */
0xd503205f, /* spin: wfe */
0xf86678a4, /* ldr x4, [x5,x6,lsl #3] */
0xb4ffffc4, /* cbz x4, spin */
0xd2800000, /* mov x0, #0x0 */
0xd2800001, /* mov x1, #0x0 */
0xd2800002, /* mov x2, #0x0 */
0xd2800003, /* mov x3, #0x0 */
0xd61f0080, /* br x4 */
};
static const uint64_t spintables[] = {
0, 0, 0, 0
};
rom_add_blob_fixed_as("raspi_smpboot", smpboot, sizeof(smpboot),
info->smp_loader_start, as);
rom_add_blob_fixed_as("raspi_spintables", spintables, sizeof(spintables),
SPINTABLE_ADDR, as);
}
static void write_board_setup(ARMCPU *cpu, const struct arm_boot_info *info)
{
arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR);
}
static void reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info)
{
CPUState *cs = CPU(cpu);
cpu_set_pc(cs, info->smp_loader_start);
}
static void setup_boot(MachineState *machine, int version, size_t ram_size)
{
static struct arm_boot_info binfo;
int r;
binfo.board_id = MACH_TYPE_BCM2708;
binfo.ram_size = ram_size;
binfo.nb_cpus = machine->smp.cpus;
if (version <= 2) {
/* The rpi1 and 2 require some custom setup code to run in Secure
* mode before booting a kernel (to set up the SMC vectors so
* that we get a no-op SMC; this is used by Linux to call the
* firmware for some cache maintenance operations.
* The rpi3 doesn't need this.
*/
binfo.board_setup_addr = BOARDSETUP_ADDR;
binfo.write_board_setup = write_board_setup;
binfo.secure_board_setup = true;
binfo.secure_boot = true;
}
/* Pi2 and Pi3 requires SMP setup */
if (version >= 2) {
binfo.smp_loader_start = SMPBOOT_ADDR;
if (version == 2) {
binfo.write_secondary_boot = write_smpboot;
} else {
binfo.write_secondary_boot = write_smpboot64;
}
binfo.secondary_cpu_reset_hook = reset_secondary;
}
/* If the user specified a "firmware" image (e.g. UEFI), we bypass
* the normal Linux boot process
*/
if (machine->firmware) {
hwaddr firmware_addr = version == 3 ? FIRMWARE_ADDR_3 : FIRMWARE_ADDR_2;
/* load the firmware image (typically kernel.img) */
r = load_image_targphys(machine->firmware, firmware_addr,
ram_size - firmware_addr);
if (r < 0) {
error_report("Failed to load firmware from %s", machine->firmware);
exit(1);
}
binfo.entry = firmware_addr;
binfo.firmware_loaded = true;
}
arm_load_kernel(ARM_CPU(first_cpu), machine, &binfo);
}
static void raspi_init(MachineState *machine, uint32_t board_rev)
{
RasPiState *s = g_new0(RasPiState, 1);
int version = board_version(board_rev);
uint64_t ram_size = board_ram_size(board_rev);
uint32_t vcram_size;
DriveInfo *di;
BlockBackend *blk;
BusState *bus;
DeviceState *carddev;
if (machine->ram_size != ram_size) {
char *size_str = size_to_str(ram_size);
error_report("Invalid RAM size, should be %s", size_str);
g_free(size_str);
exit(1);
}
object_initialize_child(OBJECT(machine), "soc", &s->soc, sizeof(s->soc),
version == 3 ? TYPE_BCM2837 : TYPE_BCM2836,
&error_abort, NULL);
/* Allocate and map RAM */
memory_region_allocate_system_memory(&s->ram, OBJECT(machine), "ram",
machine->ram_size);
/* FIXME: Remove when we have custom CPU address space support */
memory_region_add_subregion_overlap(get_system_memory(), 0, &s->ram, 0);
/* Setup the SOC */
object_property_add_const_link(OBJECT(&s->soc), "ram", OBJECT(&s->ram),
&error_abort);
object_property_set_int(OBJECT(&s->soc), board_rev, "board-rev",
&error_abort);
object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_abort);
/* Create and plug in the SD cards */
di = drive_get_next(IF_SD);
blk = di ? blk_by_legacy_dinfo(di) : NULL;
bus = qdev_get_child_bus(DEVICE(&s->soc), "sd-bus");
if (bus == NULL) {
error_report("No SD bus found in SOC object");
exit(1);
}
carddev = qdev_create(bus, TYPE_SD_CARD);
qdev_prop_set_drive(carddev, "drive", blk, &error_fatal);
object_property_set_bool(OBJECT(carddev), true, "realized", &error_fatal);
vcram_size = object_property_get_uint(OBJECT(&s->soc), "vcram-size",
&error_abort);
setup_boot(machine, version, machine->ram_size - vcram_size);
}
static void raspi2_init(MachineState *machine)
{
raspi_init(machine, 0xa21041);
}
static void raspi2_machine_init(MachineClass *mc)
{
mc->desc = "Raspberry Pi 2B";
mc->init = raspi2_init;
mc->block_default_type = IF_SD;
mc->no_parallel = 1;
mc->no_floppy = 1;
mc->no_cdrom = 1;
mc->max_cpus = BCM283X_NCPUS;
mc->min_cpus = BCM283X_NCPUS;
mc->default_cpus = BCM283X_NCPUS;
mc->default_ram_size = 1 * GiB;
mc->ignore_memory_transaction_failures = true;
};
DEFINE_MACHINE("raspi2", raspi2_machine_init)
#ifdef TARGET_AARCH64
static void raspi3_init(MachineState *machine)
{
raspi_init(machine, 0xa02082);
}
static void raspi3_machine_init(MachineClass *mc)
{
mc->desc = "Raspberry Pi 3B";
mc->init = raspi3_init;
mc->block_default_type = IF_SD;
mc->no_parallel = 1;
mc->no_floppy = 1;
mc->no_cdrom = 1;
mc->max_cpus = BCM283X_NCPUS;
mc->min_cpus = BCM283X_NCPUS;
mc->default_cpus = BCM283X_NCPUS;
mc->default_ram_size = 1 * GiB;
}
DEFINE_MACHINE("raspi3", raspi3_machine_init)
#endif
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