hw/misc/sifive_u_otp.c - qemu - Git at Google

 /*
  * 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 "qapi/error.h"
 #include "hw/qdev-properties.h"
 #include "hw/qdev-properties-system.h"
 #include "hw/sysbus.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "hw/misc/sifive_u_otp.h"
 #include "sysemu/blockdev.h"
 #include "sysemu/block-backend.h"

 #define WRITTEN_BIT_ON 0x1

 #define SET_FUSEARRAY_BIT(map, i, off, bit)    \
     map[i] = bit ? (map[i] | bit << off) : (map[i] & ~(0x1 << off))

 #define GET_FUSEARRAY_BIT(map, i, off)    \
     ((map[i] >> off) & 0x1)

 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)) {

             /* read from backend */
             if (s->blk) {
                 int32_t buf;

                 if (blk_pread(s->blk, s->pa * SIFIVE_U_OTP_FUSE_WORD, &buf,
                               SIFIVE_U_OTP_FUSE_WORD) < 0) {
                     qemu_log_mask(LOG_GUEST_ERROR,
                                   "read error index<%d>\n", s->pa);
                     return 0xff;
                 }

                 return buf;
             }

             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 & SIFIVE_U_OTP_PWE_EN;

         /* PWE is enabled. Ignore PAS=1 (no redundancy cell) */
         if (s->pwe && !s->pas) {
             if (GET_FUSEARRAY_BIT(s->fuse_wo, s->pa, s->paio)) {
                 qemu_log_mask(LOG_GUEST_ERROR,
                               "write once error: idx<%u>, bit<%u>\n",
                               s->pa, s->paio);
                 break;
             }

             /* write bit data */
             SET_FUSEARRAY_BIT(s->fuse, s->pa, s->paio, s->pdin);

             /* write to backend */
             if (s->blk) {
                 if (blk_pwrite(s->blk, s->pa * SIFIVE_U_OTP_FUSE_WORD,
                                &s->fuse[s->pa], SIFIVE_U_OTP_FUSE_WORD,
                                0) < 0) {
                     qemu_log_mask(LOG_GUEST_ERROR,
                                   "write error index<%d>\n", s->pa);
                 }
             }

             /* update written bit */
             SET_FUSEARRAY_BIT(s->fuse_wo, s->pa, s->paio, WRITTEN_BIT_ON);
         }

         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_DRIVE("drive", SiFiveUOTPState, blk),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void sifive_u_otp_realize(DeviceState *dev, Error **errp)
 {
     SiFiveUOTPState *s = SIFIVE_U_OTP(dev);
     DriveInfo *dinfo;

     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);

     dinfo = drive_get_next(IF_NONE);
     if (dinfo) {
         int ret;
         uint64_t perm;
         int filesize;
         BlockBackend *blk;

         blk = blk_by_legacy_dinfo(dinfo);
         filesize = SIFIVE_U_OTP_NUM_FUSES * SIFIVE_U_OTP_FUSE_WORD;
         if (blk_getlength(blk) < filesize) {
             error_setg(errp, "OTP drive size < 16K");
             return;
         }

         qdev_prop_set_drive_err(dev, "drive", blk, errp);

         if (s->blk) {
             perm = BLK_PERM_CONSISTENT_READ |
                    (blk_is_read_only(s->blk) ? 0 : BLK_PERM_WRITE);
             ret = blk_set_perm(s->blk, perm, BLK_PERM_ALL, errp);
             if (ret < 0) {
                 return;
             }

             if (blk_pread(s->blk, 0, s->fuse, filesize) != filesize) {
                 error_setg(errp, "failed to read the initial flash content");
             }
         }
     }
 }

 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);

     if (s->blk) {
         /* Put serial number to backend as well*/
         uint32_t serial_data;
         int index = SIFIVE_U_OTP_SERIAL_ADDR;

         serial_data = s->serial;
         if (blk_pwrite(s->blk, index * SIFIVE_U_OTP_FUSE_WORD,
                        &serial_data, SIFIVE_U_OTP_FUSE_WORD, 0) < 0) {
             qemu_log_mask(LOG_GUEST_ERROR,
                           "write error index<%d>\n", index);
         }

         serial_data = ~(s->serial);
         if (blk_pwrite(s->blk, (index + 1) * SIFIVE_U_OTP_FUSE_WORD,
                        &serial_data, SIFIVE_U_OTP_FUSE_WORD, 0) < 0) {
             qemu_log_mask(LOG_GUEST_ERROR,
                           "write error index<%d>\n", index + 1);
         }
     }

     /* Initialize write-once map */
     memset(s->fuse_wo, 0x00, sizeof(s->fuse_wo));
 }

 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)
	/*
	* 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 "qapi/error.h"
	#include "hw/qdev-properties.h"
	#include "hw/qdev-properties-system.h"
	#include "hw/sysbus.h"
	#include "qemu/log.h"
	#include "qemu/module.h"
	#include "hw/misc/sifive_u_otp.h"
	#include "sysemu/blockdev.h"
	#include "sysemu/block-backend.h"

	#define WRITTEN_BIT_ON 0x1

	#define SET_FUSEARRAY_BIT(map, i, off, bit) \
	map[i] = bit ? (map[i] \| bit << off) : (map[i] & ~(0x1 << off))

	#define GET_FUSEARRAY_BIT(map, i, off) \
	((map[i] >> off) & 0x1)

	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)) {

	/* read from backend */
	if (s->blk) {
	int32_t buf;

	if (blk_pread(s->blk, s->pa * SIFIVE_U_OTP_FUSE_WORD, &buf,
	SIFIVE_U_OTP_FUSE_WORD) < 0) {
	qemu_log_mask(LOG_GUEST_ERROR,
	"read error index<%d>\n", s->pa);
	return 0xff;
	}

	return buf;
	}

	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 & SIFIVE_U_OTP_PWE_EN;

	/* PWE is enabled. Ignore PAS=1 (no redundancy cell) */
	if (s->pwe && !s->pas) {
	if (GET_FUSEARRAY_BIT(s->fuse_wo, s->pa, s->paio)) {
	qemu_log_mask(LOG_GUEST_ERROR,
	"write once error: idx<%u>, bit<%u>\n",
	s->pa, s->paio);
	break;
	}

	/* write bit data */
	SET_FUSEARRAY_BIT(s->fuse, s->pa, s->paio, s->pdin);

	/* write to backend */
	if (s->blk) {
	if (blk_pwrite(s->blk, s->pa * SIFIVE_U_OTP_FUSE_WORD,
	&s->fuse[s->pa], SIFIVE_U_OTP_FUSE_WORD,
	0) < 0) {
	qemu_log_mask(LOG_GUEST_ERROR,
	"write error index<%d>\n", s->pa);
	}
	}

	/* update written bit */
	SET_FUSEARRAY_BIT(s->fuse_wo, s->pa, s->paio, WRITTEN_BIT_ON);
	}

	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_DRIVE("drive", SiFiveUOTPState, blk),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void sifive_u_otp_realize(DeviceState dev, Error *errp)
	{
	SiFiveUOTPState *s = SIFIVE_U_OTP(dev);
	DriveInfo *dinfo;

	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);

	dinfo = drive_get_next(IF_NONE);
	if (dinfo) {
	int ret;
	uint64_t perm;
	int filesize;
	BlockBackend *blk;

	blk = blk_by_legacy_dinfo(dinfo);
	filesize = SIFIVE_U_OTP_NUM_FUSES * SIFIVE_U_OTP_FUSE_WORD;
	if (blk_getlength(blk) < filesize) {
	error_setg(errp, "OTP drive size < 16K");
	return;
	}

	qdev_prop_set_drive_err(dev, "drive", blk, errp);

	if (s->blk) {
	perm = BLK_PERM_CONSISTENT_READ \|
	(blk_is_read_only(s->blk) ? 0 : BLK_PERM_WRITE);
	ret = blk_set_perm(s->blk, perm, BLK_PERM_ALL, errp);
	if (ret < 0) {
	return;
	}

	if (blk_pread(s->blk, 0, s->fuse, filesize) != filesize) {
	error_setg(errp, "failed to read the initial flash content");
	}
	}
	}
	}

	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);

	if (s->blk) {
	/* Put serial number to backend as well*/
	uint32_t serial_data;
	int index = SIFIVE_U_OTP_SERIAL_ADDR;

	serial_data = s->serial;
	if (blk_pwrite(s->blk, index * SIFIVE_U_OTP_FUSE_WORD,
	&serial_data, SIFIVE_U_OTP_FUSE_WORD, 0) < 0) {
	qemu_log_mask(LOG_GUEST_ERROR,
	"write error index<%d>\n", index);
	}

	serial_data = ~(s->serial);
	if (blk_pwrite(s->blk, (index + 1) * SIFIVE_U_OTP_FUSE_WORD,
	&serial_data, SIFIVE_U_OTP_FUSE_WORD, 0) < 0) {
	qemu_log_mask(LOG_GUEST_ERROR,
	"write error index<%d>\n", index + 1);
	}
	}

	/* Initialize write-once map */
	memset(s->fuse_wo, 0x00, sizeof(s->fuse_wo));
	}

	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)