hw/riscv/sifive_e.c

   1 /*
   2  * QEMU RISC-V Board Compatible with SiFive Freedom E SDK
   3  *
   4  * Copyright (c) 2017 SiFive, Inc.
   5  *
   6  * Provides a board compatible with the SiFive Freedom E SDK:
   7  *
   8  * 0) UART
   9  * 1) CLINT (Core Level Interruptor)
  10  * 2) PLIC (Platform Level Interrupt Controller)
  11  * 3) PRCI (Power, Reset, Clock, Interrupt)
  12  * 4) Registers emulated as RAM: AON, GPIO, QSPI, PWM
  13  * 5) Flash memory emulated as RAM
  14  *
  15  * The Mask ROM reset vector jumps to the flash payload at 0x2040_0000.
  16  * The OTP ROM and Flash boot code will be emulated in a future version.
  17  *
  18  * This program is free software; you can redistribute it and/or modify it
  19  * under the terms and conditions of the GNU General Public License,
  20  * version 2 or later, as published by the Free Software Foundation.
  21  *
  22  * This program is distributed in the hope it will be useful, but WITHOUT
  23  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  24  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  25  * more details.
  26  *
  27  * You should have received a copy of the GNU General Public License along with
  28  * this program.  If not, see <http://www.gnu.org/licenses/>.
  29  */
  30
  31 #include "qemu/osdep.h"
  32 #include "qemu/log.h"
  33 #include "qemu/error-report.h"
  34 #include "qapi/error.h"
  35 #include "hw/hw.h"
  36 #include "hw/boards.h"
  37 #include "hw/loader.h"
  38 #include "hw/sysbus.h"
  39 #include "hw/char/serial.h"
  40 #include "target/riscv/cpu.h"
  41 #include "hw/riscv/riscv_hart.h"
  42 #include "hw/riscv/sifive_plic.h"
  43 #include "hw/riscv/sifive_clint.h"
  44 #include "hw/riscv/sifive_prci.h"
  45 #include "hw/riscv/sifive_uart.h"
  46 #include "hw/riscv/sifive_e.h"
  47 #include "chardev/char.h"
  48 #include "sysemu/arch_init.h"
  49 #include "exec/address-spaces.h"
  50 #include "elf.h"
  51
  52 static const struct MemmapEntry {
  53     hwaddr base;
  54     hwaddr size;
  55 } sifive_e_memmap[] = {
  56     [SIFIVE_E_DEBUG] =    {        0x0,      0x100 },
  57     [SIFIVE_E_MROM] =     {     0x1000,     0x2000 },
  58     [SIFIVE_E_OTP] =      {    0x20000,     0x2000 },
  59     [SIFIVE_E_CLINT] =    {  0x2000000,    0x10000 },
  60     [SIFIVE_E_PLIC] =     {  0xc000000,  0x4000000 },
  61     [SIFIVE_E_AON] =      { 0x10000000,     0x8000 },
  62     [SIFIVE_E_PRCI] =     { 0x10008000,     0x8000 },
  63     [SIFIVE_E_OTP_CTRL] = { 0x10010000,     0x1000 },
  64     [SIFIVE_E_GPIO0] =    { 0x10012000,     0x1000 },
  65     [SIFIVE_E_UART0] =    { 0x10013000,     0x1000 },
  66     [SIFIVE_E_QSPI0] =    { 0x10014000,     0x1000 },
  67     [SIFIVE_E_PWM0] =     { 0x10015000,     0x1000 },
  68     [SIFIVE_E_UART1] =    { 0x10023000,     0x1000 },
  69     [SIFIVE_E_QSPI1] =    { 0x10024000,     0x1000 },
  70     [SIFIVE_E_PWM1] =     { 0x10025000,     0x1000 },
  71     [SIFIVE_E_QSPI2] =    { 0x10034000,     0x1000 },
  72     [SIFIVE_E_PWM2] =     { 0x10035000,     0x1000 },
  73     [SIFIVE_E_XIP] =      { 0x20000000, 0x20000000 },
  74     [SIFIVE_E_DTIM] =     { 0x80000000,     0x4000 }
  75 };
  76
  77 static uint64_t load_kernel(const char *kernel_filename)
  78 {
  79     uint64_t kernel_entry, kernel_high;
  80
  81     if (load_elf(kernel_filename, NULL, NULL,
  82                  &kernel_entry, NULL, &kernel_high,
  83                  0, EM_RISCV, 1, 0) < 0) {
  84         error_report("qemu: could not load kernel '%s'", kernel_filename);
  85         exit(1);
  86     }
  87     return kernel_entry;
  88 }
  89
  90 static void sifive_mmio_emulate(MemoryRegion *parent, const char *name,
  91                              uintptr_t offset, uintptr_t length)
  92 {
  93     MemoryRegion *mock_mmio = g_new(MemoryRegion, 1);
  94     memory_region_init_ram(mock_mmio, NULL, name, length, &error_fatal);
  95     memory_region_add_subregion(parent, offset, mock_mmio);
  96 }
  97
  98 static void riscv_sifive_e_init(MachineState *machine)
  99 {
 100     const struct MemmapEntry *memmap = sifive_e_memmap;
 101
 102     SiFiveEState *s = g_new0(SiFiveEState, 1);
 103     MemoryRegion *sys_mem = get_system_memory();
 104     MemoryRegion *main_mem = g_new(MemoryRegion, 1);
 105     MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
 106     MemoryRegion *xip_mem = g_new(MemoryRegion, 1);
 107     int i;
 108
 109     /* Initialize SOC */
 110     object_initialize(&s->soc, sizeof(s->soc), TYPE_RISCV_HART_ARRAY);
 111     object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc),
 112                               &error_abort);
 113     object_property_set_str(OBJECT(&s->soc), SIFIVE_E_CPU, "cpu-type",
 114                             &error_abort);
 115     object_property_set_int(OBJECT(&s->soc), smp_cpus, "num-harts",
 116                             &error_abort);
 117     object_property_set_bool(OBJECT(&s->soc), true, "realized",
 118                             &error_abort);
 119
 120     /* Data Tightly Integrated Memory */
 121     memory_region_init_ram(main_mem, NULL, "riscv.sifive.e.ram",
 122         memmap[SIFIVE_E_DTIM].size, &error_fatal);
 123     memory_region_add_subregion(sys_mem,
 124         memmap[SIFIVE_E_DTIM].base, main_mem);
 125
 126     /* Mask ROM */
 127     memory_region_init_rom(mask_rom, NULL, "riscv.sifive.e.mrom",
 128         memmap[SIFIVE_E_MROM].size, &error_fatal);
 129     memory_region_add_subregion(sys_mem,
 130         memmap[SIFIVE_E_MROM].base, mask_rom);
 131
 132     /* MMIO */
 133     s->plic = sifive_plic_create(memmap[SIFIVE_E_PLIC].base,
 134         (char *)SIFIVE_E_PLIC_HART_CONFIG,
 135         SIFIVE_E_PLIC_NUM_SOURCES,
 136         SIFIVE_E_PLIC_NUM_PRIORITIES,
 137         SIFIVE_E_PLIC_PRIORITY_BASE,
 138         SIFIVE_E_PLIC_PENDING_BASE,
 139         SIFIVE_E_PLIC_ENABLE_BASE,
 140         SIFIVE_E_PLIC_ENABLE_STRIDE,
 141         SIFIVE_E_PLIC_CONTEXT_BASE,
 142         SIFIVE_E_PLIC_CONTEXT_STRIDE,
 143         memmap[SIFIVE_E_PLIC].size);
 144     sifive_clint_create(memmap[SIFIVE_E_CLINT].base,
 145         memmap[SIFIVE_E_CLINT].size, smp_cpus,
 146         SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE);
 147     sifive_mmio_emulate(sys_mem, "riscv.sifive.e.aon",
 148         memmap[SIFIVE_E_AON].base, memmap[SIFIVE_E_AON].size);
 149     sifive_prci_create(memmap[SIFIVE_E_PRCI].base);
 150     sifive_mmio_emulate(sys_mem, "riscv.sifive.e.gpio0",
 151         memmap[SIFIVE_E_GPIO0].base, memmap[SIFIVE_E_GPIO0].size);
 152     sifive_uart_create(sys_mem, memmap[SIFIVE_E_UART0].base,
 153         serial_hd(0), SIFIVE_PLIC(s->plic)->irqs[SIFIVE_E_UART0_IRQ]);
 154     sifive_mmio_emulate(sys_mem, "riscv.sifive.e.qspi0",
 155         memmap[SIFIVE_E_QSPI0].base, memmap[SIFIVE_E_QSPI0].size);
 156     sifive_mmio_emulate(sys_mem, "riscv.sifive.e.pwm0",
 157         memmap[SIFIVE_E_PWM0].base, memmap[SIFIVE_E_PWM0].size);
 158     /* sifive_uart_create(sys_mem, memmap[SIFIVE_E_UART1].base,
 159         serial_hd(1), SIFIVE_PLIC(s->plic)->irqs[SIFIVE_E_UART1_IRQ]); */
 160     sifive_mmio_emulate(sys_mem, "riscv.sifive.e.qspi1",
 161         memmap[SIFIVE_E_QSPI1].base, memmap[SIFIVE_E_QSPI1].size);
 162     sifive_mmio_emulate(sys_mem, "riscv.sifive.e.pwm1",
 163         memmap[SIFIVE_E_PWM1].base, memmap[SIFIVE_E_PWM1].size);
 164     sifive_mmio_emulate(sys_mem, "riscv.sifive.e.qspi2",
 165         memmap[SIFIVE_E_QSPI2].base, memmap[SIFIVE_E_QSPI2].size);
 166     sifive_mmio_emulate(sys_mem, "riscv.sifive.e.pwm2",
 167         memmap[SIFIVE_E_PWM2].base, memmap[SIFIVE_E_PWM2].size);
 168
 169     /* Flash memory */
 170     memory_region_init_ram(xip_mem, NULL, "riscv.sifive.e.xip",
 171         memmap[SIFIVE_E_XIP].size, &error_fatal);
 172     memory_region_set_readonly(xip_mem, true);
 173     memory_region_add_subregion(sys_mem, memmap[SIFIVE_E_XIP].base, xip_mem);
 174
 175     /* Mask ROM reset vector */
 176     uint32_t reset_vec[2] = {
 177         0x204002b7,        /* 0x1000: lui     t0,0x20400 */
 178         0x00028067,        /* 0x1004: jr      t0 */
 179     };
 180
 181     /* copy in the reset vector in little_endian byte order */
 182     for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
 183         reset_vec[i] = cpu_to_le32(reset_vec[i]);
 184     }
 185     rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
 186                           memmap[SIFIVE_E_MROM].base, &address_space_memory);
 187
 188     if (machine->kernel_filename) {
 189         load_kernel(machine->kernel_filename);
 190     }
 191 }
 192
 193 static void riscv_sifive_e_machine_init(MachineClass *mc)
 194 {
 195     mc->desc = "RISC-V Board compatible with SiFive E SDK";
 196     mc->init = riscv_sifive_e_init;
 197     mc->max_cpus = 1;
 198 }
 199
 200 DEFINE_MACHINE("sifive_e", riscv_sifive_e_machine_init)