diff options
Diffstat (limited to 'hw/misc/sifive_u_otp.c')
| -rw-r--r-- | hw/misc/sifive_u_otp.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/hw/misc/sifive_u_otp.c b/hw/misc/sifive_u_otp.c new file mode 100644 index 0000000000..c2f3c8e129 --- /dev/null +++ b/hw/misc/sifive_u_otp.c @@ -0,0 +1,191 @@ +/* + * QEMU SiFive U OTP (One-Time Programmable) Memory interface + * + * Copyright (c) 2019 Bin Meng <bmeng.cn@gmail.com> + * + * Simple model of the OTP to emulate register reads made by the SDK BSP + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2 or later, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "qemu/osdep.h" +#include "hw/qdev-properties.h" +#include "hw/sysbus.h" +#include "qemu/log.h" +#include "qemu/module.h" +#include "hw/misc/sifive_u_otp.h" + +static uint64_t sifive_u_otp_read(void *opaque, hwaddr addr, unsigned int size) +{ + SiFiveUOTPState *s = opaque; + + switch (addr) { + case SIFIVE_U_OTP_PA: + return s->pa; + case SIFIVE_U_OTP_PAIO: + return s->paio; + case SIFIVE_U_OTP_PAS: + return s->pas; + case SIFIVE_U_OTP_PCE: + return s->pce; + case SIFIVE_U_OTP_PCLK: + return s->pclk; + case SIFIVE_U_OTP_PDIN: + return s->pdin; + case SIFIVE_U_OTP_PDOUT: + if ((s->pce & SIFIVE_U_OTP_PCE_EN) && + (s->pdstb & SIFIVE_U_OTP_PDSTB_EN) && + (s->ptrim & SIFIVE_U_OTP_PTRIM_EN)) { + return s->fuse[s->pa & SIFIVE_U_OTP_PA_MASK]; + } else { + return 0xff; + } + case SIFIVE_U_OTP_PDSTB: + return s->pdstb; + case SIFIVE_U_OTP_PPROG: + return s->pprog; + case SIFIVE_U_OTP_PTC: + return s->ptc; + case SIFIVE_U_OTP_PTM: + return s->ptm; + case SIFIVE_U_OTP_PTM_REP: + return s->ptm_rep; + case SIFIVE_U_OTP_PTR: + return s->ptr; + case SIFIVE_U_OTP_PTRIM: + return s->ptrim; + case SIFIVE_U_OTP_PWE: + return s->pwe; + } + + qemu_log_mask(LOG_GUEST_ERROR, "%s: read: addr=0x%" HWADDR_PRIx "\n", + __func__, addr); + return 0; +} + +static void sifive_u_otp_write(void *opaque, hwaddr addr, + uint64_t val64, unsigned int size) +{ + SiFiveUOTPState *s = opaque; + uint32_t val32 = (uint32_t)val64; + + switch (addr) { + case SIFIVE_U_OTP_PA: + s->pa = val32 & SIFIVE_U_OTP_PA_MASK; + break; + case SIFIVE_U_OTP_PAIO: + s->paio = val32; + break; + case SIFIVE_U_OTP_PAS: + s->pas = val32; + break; + case SIFIVE_U_OTP_PCE: + s->pce = val32; + break; + case SIFIVE_U_OTP_PCLK: + s->pclk = val32; + break; + case SIFIVE_U_OTP_PDIN: + s->pdin = val32; + break; + case SIFIVE_U_OTP_PDOUT: + /* read-only */ + break; + case SIFIVE_U_OTP_PDSTB: + s->pdstb = val32; + break; + case SIFIVE_U_OTP_PPROG: + s->pprog = val32; + break; + case SIFIVE_U_OTP_PTC: + s->ptc = val32; + break; + case SIFIVE_U_OTP_PTM: + s->ptm = val32; + break; + case SIFIVE_U_OTP_PTM_REP: + s->ptm_rep = val32; + break; + case SIFIVE_U_OTP_PTR: + s->ptr = val32; + break; + case SIFIVE_U_OTP_PTRIM: + s->ptrim = val32; + break; + case SIFIVE_U_OTP_PWE: + s->pwe = val32; + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, "%s: bad write: addr=0x%" HWADDR_PRIx + " v=0x%x\n", __func__, addr, val32); + } +} + +static const MemoryRegionOps sifive_u_otp_ops = { + .read = sifive_u_otp_read, + .write = sifive_u_otp_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .valid = { + .min_access_size = 4, + .max_access_size = 4 + } +}; + +static Property sifive_u_otp_properties[] = { + DEFINE_PROP_UINT32("serial", SiFiveUOTPState, serial, 0), + DEFINE_PROP_END_OF_LIST(), +}; + +static void sifive_u_otp_realize(DeviceState *dev, Error **errp) +{ + SiFiveUOTPState *s = SIFIVE_U_OTP(dev); + + memory_region_init_io(&s->mmio, OBJECT(dev), &sifive_u_otp_ops, s, + TYPE_SIFIVE_U_OTP, SIFIVE_U_OTP_REG_SIZE); + sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mmio); +} + +static void sifive_u_otp_reset(DeviceState *dev) +{ + SiFiveUOTPState *s = SIFIVE_U_OTP(dev); + + /* Initialize all fuses' initial value to 0xFFs */ + memset(s->fuse, 0xff, sizeof(s->fuse)); + + /* Make a valid content of serial number */ + s->fuse[SIFIVE_U_OTP_SERIAL_ADDR] = s->serial; + s->fuse[SIFIVE_U_OTP_SERIAL_ADDR + 1] = ~(s->serial); +} + +static void sifive_u_otp_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + device_class_set_props(dc, sifive_u_otp_properties); + dc->realize = sifive_u_otp_realize; + dc->reset = sifive_u_otp_reset; +} + +static const TypeInfo sifive_u_otp_info = { + .name = TYPE_SIFIVE_U_OTP, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(SiFiveUOTPState), + .class_init = sifive_u_otp_class_init, +}; + +static void sifive_u_otp_register_types(void) +{ + type_register_static(&sifive_u_otp_info); +} + +type_init(sifive_u_otp_register_types) |