hw/riscv/sifive_u.c

   1 /*
   2  * QEMU RISC-V Board Compatible with SiFive Freedom U SDK
   3  *
   4  * Copyright (c) 2016-2017 Sagar Karandikar, [email protected]
   5  * Copyright (c) 2017 SiFive, Inc.
   6  *
   7  * Provides a board compatible with the SiFive Freedom U SDK:
   8  *
   9  * 0) UART
  10  * 1) CLINT (Core Level Interruptor)
  11  * 2) PLIC (Platform Level Interrupt Controller)
  12  *
  13  * This board currently uses a hardcoded devicetree that indicates one hart.
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms and conditions of the GNU General Public License,
  17  * version 2 or later, as published by the Free Software Foundation.
  18  *
  19  * This program is distributed in the hope it will be useful, but WITHOUT
  20  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  21  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  22  * more details.
  23  *
  24  * You should have received a copy of the GNU General Public License along with
  25  * this program.  If not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qemu/log.h"
  30 #include "qemu/error-report.h"
  31 #include "qapi/error.h"
  32 #include "hw/hw.h"
  33 #include "hw/boards.h"
  34 #include "hw/loader.h"
  35 #include "hw/sysbus.h"
  36 #include "hw/char/serial.h"
  37 #include "target/riscv/cpu.h"
  38 #include "hw/riscv/riscv_hart.h"
  39 #include "hw/riscv/sifive_plic.h"
  40 #include "hw/riscv/sifive_clint.h"
  41 #include "hw/riscv/sifive_uart.h"
  42 #include "hw/riscv/sifive_prci.h"
  43 #include "hw/riscv/sifive_u.h"
  44 #include "chardev/char.h"
  45 #include "sysemu/arch_init.h"
  46 #include "sysemu/device_tree.h"
  47 #include "exec/address-spaces.h"
  48 #include "elf.h"
  49
  50 #include <libfdt.h>
  51
  52 static const struct MemmapEntry {
  53     hwaddr base;
  54     hwaddr size;
  55 } sifive_u_memmap[] = {
  56     [SIFIVE_U_DEBUG] =    {        0x0,      0x100 },
  57     [SIFIVE_U_MROM] =     {     0x1000,    0x11000 },
  58     [SIFIVE_U_CLINT] =    {  0x2000000,    0x10000 },
  59     [SIFIVE_U_PLIC] =     {  0xc000000,  0x4000000 },
  60     [SIFIVE_U_UART0] =    { 0x10013000,     0x1000 },
  61     [SIFIVE_U_UART1] =    { 0x10023000,     0x1000 },
  62     [SIFIVE_U_DRAM] =     { 0x80000000,        0x0 },
  63 };
  64
  65 static uint64_t load_kernel(const char *kernel_filename)
  66 {
  67     uint64_t kernel_entry, kernel_high;
  68
  69     if (load_elf(kernel_filename, NULL, NULL,
  70                  &kernel_entry, NULL, &kernel_high,
  71                  0, EM_RISCV, 1, 0) < 0) {
  72         error_report("qemu: could not load kernel '%s'", kernel_filename);
  73         exit(1);
  74     }
  75     return kernel_entry;
  76 }
  77
  78 static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
  79     uint64_t mem_size, const char *cmdline)
  80 {
  81     void *fdt;
  82     int cpu;
  83     uint32_t *cells;
  84     char *nodename;
  85     uint32_t plic_phandle;
  86
  87     fdt = s->fdt = create_device_tree(&s->fdt_size);
  88     if (!fdt) {
  89         error_report("create_device_tree() failed");
  90         exit(1);
  91     }
  92
  93     qemu_fdt_setprop_string(fdt, "/", "model", "ucbbar,spike-bare,qemu");
  94     qemu_fdt_setprop_string(fdt, "/", "compatible", "ucbbar,spike-bare-dev");
  95     qemu_fdt_setprop_cell(fdt, "/", "#size-cells", 0x2);
  96     qemu_fdt_setprop_cell(fdt, "/", "#address-cells", 0x2);
  97
  98     qemu_fdt_add_subnode(fdt, "/soc");
  99     qemu_fdt_setprop(fdt, "/soc", "ranges", NULL, 0);
 100     qemu_fdt_setprop_string(fdt, "/soc", "compatible", "ucbbar,spike-bare-soc");
 101     qemu_fdt_setprop_cell(fdt, "/soc", "#size-cells", 0x2);
 102     qemu_fdt_setprop_cell(fdt, "/soc", "#address-cells", 0x2);
 103
 104     nodename = g_strdup_printf("/memory@%lx",
 105         (long)memmap[SIFIVE_U_DRAM].base);
 106     qemu_fdt_add_subnode(fdt, nodename);
 107     qemu_fdt_setprop_cells(fdt, nodename, "reg",
 108         memmap[SIFIVE_U_DRAM].base >> 32, memmap[SIFIVE_U_DRAM].base,
 109         mem_size >> 32, mem_size);
 110     qemu_fdt_setprop_string(fdt, nodename, "device_type", "memory");
 111     g_free(nodename);
 112
 113     qemu_fdt_add_subnode(fdt, "/cpus");
 114     qemu_fdt_setprop_cell(fdt, "/cpus", "timebase-frequency",
 115         SIFIVE_CLINT_TIMEBASE_FREQ);
 116     qemu_fdt_setprop_cell(fdt, "/cpus", "#size-cells", 0x0);
 117     qemu_fdt_setprop_cell(fdt, "/cpus", "#address-cells", 0x1);
 118
 119     for (cpu = s->soc.num_harts - 1; cpu >= 0; cpu--) {
 120         nodename = g_strdup_printf("/cpus/cpu@%d", cpu);
 121         char *intc = g_strdup_printf("/cpus/cpu@%d/interrupt-controller", cpu);
 122         char *isa = riscv_isa_string(&s->soc.harts[cpu]);
 123         qemu_fdt_add_subnode(fdt, nodename);
 124         qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
 125                               SIFIVE_U_CLOCK_FREQ);
 126         qemu_fdt_setprop_string(fdt, nodename, "mmu-type", "riscv,sv48");
 127         qemu_fdt_setprop_string(fdt, nodename, "riscv,isa", isa);
 128         qemu_fdt_setprop_string(fdt, nodename, "compatible", "riscv");
 129         qemu_fdt_setprop_string(fdt, nodename, "status", "okay");
 130         qemu_fdt_setprop_cell(fdt, nodename, "reg", cpu);
 131         qemu_fdt_setprop_string(fdt, nodename, "device_type", "cpu");
 132         qemu_fdt_add_subnode(fdt, intc);
 133         qemu_fdt_setprop_cell(fdt, intc, "phandle", 1);
 134         qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", 1);
 135         qemu_fdt_setprop_string(fdt, intc, "compatible", "riscv,cpu-intc");
 136         qemu_fdt_setprop(fdt, intc, "interrupt-controller", NULL, 0);
 137         qemu_fdt_setprop_cell(fdt, intc, "#interrupt-cells", 1);
 138         g_free(isa);
 139         g_free(intc);
 140         g_free(nodename);
 141     }
 142
 143     cells =  g_new0(uint32_t, s->soc.num_harts * 4);
 144     for (cpu = 0; cpu < s->soc.num_harts; cpu++) {
 145         nodename =
 146             g_strdup_printf("/cpus/cpu@%d/interrupt-controller", cpu);
 147         uint32_t intc_phandle = qemu_fdt_get_phandle(fdt, nodename);
 148         cells[cpu * 4 + 0] = cpu_to_be32(intc_phandle);
 149         cells[cpu * 4 + 1] = cpu_to_be32(IRQ_M_SOFT);
 150         cells[cpu * 4 + 2] = cpu_to_be32(intc_phandle);
 151         cells[cpu * 4 + 3] = cpu_to_be32(IRQ_M_TIMER);
 152         g_free(nodename);
 153     }
 154     nodename = g_strdup_printf("/soc/clint@%lx",
 155         (long)memmap[SIFIVE_U_CLINT].base);
 156     qemu_fdt_add_subnode(fdt, nodename);
 157     qemu_fdt_setprop_string(fdt, nodename, "compatible", "riscv,clint0");
 158     qemu_fdt_setprop_cells(fdt, nodename, "reg",
 159         0x0, memmap[SIFIVE_U_CLINT].base,
 160         0x0, memmap[SIFIVE_U_CLINT].size);
 161     qemu_fdt_setprop(fdt, nodename, "interrupts-extended",
 162         cells, s->soc.num_harts * sizeof(uint32_t) * 4);
 163     g_free(cells);
 164     g_free(nodename);
 165
 166     cells =  g_new0(uint32_t, s->soc.num_harts * 4);
 167     for (cpu = 0; cpu < s->soc.num_harts; cpu++) {
 168         nodename =
 169             g_strdup_printf("/cpus/cpu@%d/interrupt-controller", cpu);
 170         uint32_t intc_phandle = qemu_fdt_get_phandle(fdt, nodename);
 171         cells[cpu * 4 + 0] = cpu_to_be32(intc_phandle);
 172         cells[cpu * 4 + 1] = cpu_to_be32(IRQ_M_EXT);
 173         cells[cpu * 4 + 2] = cpu_to_be32(intc_phandle);
 174         cells[cpu * 4 + 3] = cpu_to_be32(IRQ_S_EXT);
 175         g_free(nodename);
 176     }
 177     nodename = g_strdup_printf("/soc/interrupt-controller@%lx",
 178         (long)memmap[SIFIVE_U_PLIC].base);
 179     qemu_fdt_add_subnode(fdt, nodename);
 180     qemu_fdt_setprop_cell(fdt, nodename, "#interrupt-cells", 1);
 181     qemu_fdt_setprop_string(fdt, nodename, "compatible", "riscv,plic0");
 182     qemu_fdt_setprop(fdt, nodename, "interrupt-controller", NULL, 0);
 183     qemu_fdt_setprop(fdt, nodename, "interrupts-extended",
 184         cells, s->soc.num_harts * sizeof(uint32_t) * 4);
 185     qemu_fdt_setprop_cells(fdt, nodename, "reg",
 186         0x0, memmap[SIFIVE_U_PLIC].base,
 187         0x0, memmap[SIFIVE_U_PLIC].size);
 188     qemu_fdt_setprop_string(fdt, nodename, "reg-names", "control");
 189     qemu_fdt_setprop_cell(fdt, nodename, "riscv,max-priority", 7);
 190     qemu_fdt_setprop_cell(fdt, nodename, "riscv,ndev", 4);
 191     qemu_fdt_setprop_cells(fdt, nodename, "phandle", 2);
 192     qemu_fdt_setprop_cells(fdt, nodename, "linux,phandle", 2);
 193     plic_phandle = qemu_fdt_get_phandle(fdt, nodename);
 194     g_free(cells);
 195     g_free(nodename);
 196
 197     nodename = g_strdup_printf("/uart@%lx",
 198         (long)memmap[SIFIVE_U_UART0].base);
 199     qemu_fdt_add_subnode(fdt, nodename);
 200     qemu_fdt_setprop_string(fdt, nodename, "compatible", "sifive,uart0");
 201     qemu_fdt_setprop_cells(fdt, nodename, "reg",
 202         0x0, memmap[SIFIVE_U_UART0].base,
 203         0x0, memmap[SIFIVE_U_UART0].size);
 204     qemu_fdt_setprop_cells(fdt, nodename, "interrupt-parent", plic_phandle);
 205     qemu_fdt_setprop_cells(fdt, nodename, "interrupts", 1);
 206
 207     qemu_fdt_add_subnode(fdt, "/chosen");
 208     qemu_fdt_setprop_string(fdt, "/chosen", "stdout-path", nodename);
 209     qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", cmdline);
 210     g_free(nodename);
 211 }
 212
 213 static void riscv_sifive_u_init(MachineState *machine)
 214 {
 215     const struct MemmapEntry *memmap = sifive_u_memmap;
 216
 217     SiFiveUState *s = g_new0(SiFiveUState, 1);
 218     MemoryRegion *system_memory = get_system_memory();
 219     MemoryRegion *main_mem = g_new(MemoryRegion, 1);
 220     MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
 221     int i;
 222
 223     /* Initialize SOC */
 224     object_initialize(&s->soc, sizeof(s->soc), TYPE_RISCV_HART_ARRAY);
 225     object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc),
 226                               &error_abort);
 227     object_property_set_str(OBJECT(&s->soc), SIFIVE_U_CPU, "cpu-type",
 228                             &error_abort);
 229     object_property_set_int(OBJECT(&s->soc), smp_cpus, "num-harts",
 230                             &error_abort);
 231     object_property_set_bool(OBJECT(&s->soc), true, "realized",
 232                             &error_abort);
 233
 234     /* register RAM */
 235     memory_region_init_ram(main_mem, NULL, "riscv.sifive.u.ram",
 236                            machine->ram_size, &error_fatal);
 237     memory_region_add_subregion(system_memory, memmap[SIFIVE_U_DRAM].base,
 238         main_mem);
 239
 240     /* create device tree */
 241     create_fdt(s, memmap, machine->ram_size, machine->kernel_cmdline);
 242
 243     /* boot rom */
 244     memory_region_init_rom(mask_rom, NULL, "riscv.sifive.u.mrom",
 245                            memmap[SIFIVE_U_MROM].size, &error_fatal);
 246     memory_region_add_subregion(system_memory, memmap[SIFIVE_U_MROM].base,
 247                                 mask_rom);
 248
 249     if (machine->kernel_filename) {
 250         load_kernel(machine->kernel_filename);
 251     }
 252
 253     /* reset vector */
 254     uint32_t reset_vec[8] = {
 255         0x00000297,                    /* 1:  auipc  t0, %pcrel_hi(dtb) */
 256         0x02028593,                    /*     addi   a1, t0, %pcrel_lo(1b) */
 257         0xf1402573,                    /*     csrr   a0, mhartid  */
 258 #if defined(TARGET_RISCV32)
 259         0x0182a283,                    /*     lw     t0, 24(t0) */
 260 #elif defined(TARGET_RISCV64)
 261         0x0182b283,                    /*     ld     t0, 24(t0) */
 262 #endif
 263         0x00028067,                    /*     jr     t0 */
 264         0x00000000,
 265         memmap[SIFIVE_U_DRAM].base, /* start: .dword DRAM_BASE */
 266         0x00000000,
 267                                        /* dtb: */
 268     };
 269
 270     /* copy in the reset vector in little_endian byte order */
 271     for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
 272         reset_vec[i] = cpu_to_le32(reset_vec[i]);
 273     }
 274     rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
 275                           memmap[SIFIVE_U_MROM].base, &address_space_memory);
 276
 277     /* copy in the device tree */
 278     if (fdt_pack(s->fdt) || fdt_totalsize(s->fdt) >
 279             memmap[SIFIVE_U_MROM].size - sizeof(reset_vec)) {
 280         error_report("not enough space to store device-tree");
 281         exit(1);
 282     }
 283     qemu_fdt_dumpdtb(s->fdt, fdt_totalsize(s->fdt));
 284     rom_add_blob_fixed_as("mrom.fdt", s->fdt, fdt_totalsize(s->fdt),
 285                           memmap[SIFIVE_U_MROM].base + sizeof(reset_vec),
 286                           &address_space_memory);
 287
 288     /* MMIO */
 289     s->plic = sifive_plic_create(memmap[SIFIVE_U_PLIC].base,
 290         (char *)SIFIVE_U_PLIC_HART_CONFIG,
 291         SIFIVE_U_PLIC_NUM_SOURCES,
 292         SIFIVE_U_PLIC_NUM_PRIORITIES,
 293         SIFIVE_U_PLIC_PRIORITY_BASE,
 294         SIFIVE_U_PLIC_PENDING_BASE,
 295         SIFIVE_U_PLIC_ENABLE_BASE,
 296         SIFIVE_U_PLIC_ENABLE_STRIDE,
 297         SIFIVE_U_PLIC_CONTEXT_BASE,
 298         SIFIVE_U_PLIC_CONTEXT_STRIDE,
 299         memmap[SIFIVE_U_PLIC].size);
 300     sifive_uart_create(system_memory, memmap[SIFIVE_U_UART0].base,
 301         serial_hd(0), SIFIVE_PLIC(s->plic)->irqs[SIFIVE_U_UART0_IRQ]);
 302     /* sifive_uart_create(system_memory, memmap[SIFIVE_U_UART1].base,
 303         serial_hd(1), SIFIVE_PLIC(s->plic)->irqs[SIFIVE_U_UART1_IRQ]); */
 304     sifive_clint_create(memmap[SIFIVE_U_CLINT].base,
 305         memmap[SIFIVE_U_CLINT].size, smp_cpus,
 306         SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE);
 307 }
 308
 309 static void riscv_sifive_u_machine_init(MachineClass *mc)
 310 {
 311     mc->desc = "RISC-V Board compatible with SiFive U SDK";
 312     mc->init = riscv_sifive_u_init;
 313     mc->max_cpus = 1;
 314 }
 315
 316 DEFINE_MACHINE("sifive_u", riscv_sifive_u_machine_init)