hw/ssi/aspeed_smc.c - qemu - Git at Google

 /*
  * ASPEED AST2400 SMC Controller (SPI Flash Only)
  *
  * Copyright (C) 2016 IBM Corp.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */

 #include "qemu/osdep.h"
 #include "hw/sysbus.h"
 #include "sysemu/sysemu.h"
 #include "qemu/log.h"
 #include "include/qemu/error-report.h"
 #include "exec/address-spaces.h"

 #include "hw/ssi/aspeed_smc.h"

 /* CE Type Setting Register */
 #define R_CONF            (0x00 / 4)
 #define   CONF_LEGACY_DISABLE  (1 << 31)
 #define   CONF_ENABLE_W4       20
 #define   CONF_ENABLE_W3       19
 #define   CONF_ENABLE_W2       18
 #define   CONF_ENABLE_W1       17
 #define   CONF_ENABLE_W0       16
 #define   CONF_FLASH_TYPE4     9
 #define   CONF_FLASH_TYPE3     7
 #define   CONF_FLASH_TYPE2     5
 #define   CONF_FLASH_TYPE1     3
 #define   CONF_FLASH_TYPE0     1

 /* CE Control Register */
 #define R_CE_CTRL            (0x04 / 4)
 #define   CTRL_EXTENDED4       4  /* 32 bit addressing for SPI */
 #define   CTRL_EXTENDED3       3  /* 32 bit addressing for SPI */
 #define   CTRL_EXTENDED2       2  /* 32 bit addressing for SPI */
 #define   CTRL_EXTENDED1       1  /* 32 bit addressing for SPI */
 #define   CTRL_EXTENDED0       0  /* 32 bit addressing for SPI */

 /* Interrupt Control and Status Register */
 #define R_INTR_CTRL       (0x08 / 4)
 #define   INTR_CTRL_DMA_STATUS            (1 << 11)
 #define   INTR_CTRL_CMD_ABORT_STATUS      (1 << 10)
 #define   INTR_CTRL_WRITE_PROTECT_STATUS  (1 << 9)
 #define   INTR_CTRL_DMA_EN                (1 << 3)
 #define   INTR_CTRL_CMD_ABORT_EN          (1 << 2)
 #define   INTR_CTRL_WRITE_PROTECT_EN      (1 << 1)

 /* CEx Control Register */
 #define R_CTRL0           (0x10 / 4)
 #define   CTRL_CMD_SHIFT           16
 #define   CTRL_CMD_MASK            0xff
 #define   CTRL_CE_STOP_ACTIVE      (1 << 2)
 #define   CTRL_CMD_MODE_MASK       0x3
 #define     CTRL_READMODE          0x0
 #define     CTRL_FREADMODE         0x1
 #define     CTRL_WRITEMODE         0x2
 #define     CTRL_USERMODE          0x3
 #define R_CTRL1           (0x14 / 4)
 #define R_CTRL2           (0x18 / 4)
 #define R_CTRL3           (0x1C / 4)
 #define R_CTRL4           (0x20 / 4)

 /* CEx Segment Address Register */
 #define R_SEG_ADDR0       (0x30 / 4)
 #define   SEG_SIZE_SHIFT       24   /* 8MB units */
 #define   SEG_SIZE_MASK        0x7f
 #define   SEG_START_SHIFT      16   /* address bit [A29-A23] */
 #define   SEG_START_MASK       0x7f
 #define R_SEG_ADDR1       (0x34 / 4)
 #define R_SEG_ADDR2       (0x38 / 4)
 #define R_SEG_ADDR3       (0x3C / 4)
 #define R_SEG_ADDR4       (0x40 / 4)

 /* Misc Control Register #1 */
 #define R_MISC_CTRL1      (0x50 / 4)

 /* Misc Control Register #2 */
 #define R_MISC_CTRL2      (0x54 / 4)

 /* DMA Control/Status Register */
 #define R_DMA_CTRL        (0x80 / 4)
 #define   DMA_CTRL_DELAY_MASK   0xf
 #define   DMA_CTRL_DELAY_SHIFT  8
 #define   DMA_CTRL_FREQ_MASK    0xf
 #define   DMA_CTRL_FREQ_SHIFT   4
 #define   DMA_CTRL_MODE         (1 << 3)
 #define   DMA_CTRL_CKSUM        (1 << 2)
 #define   DMA_CTRL_DIR          (1 << 1)
 #define   DMA_CTRL_EN           (1 << 0)

 /* DMA Flash Side Address */
 #define R_DMA_FLASH_ADDR  (0x84 / 4)

 /* DMA DRAM Side Address */
 #define R_DMA_DRAM_ADDR   (0x88 / 4)

 /* DMA Length Register */
 #define R_DMA_LEN         (0x8C / 4)

 /* Checksum Calculation Result */
 #define R_DMA_CHECKSUM    (0x90 / 4)

 /* Misc Control Register #2 */
 #define R_TIMINGS         (0x94 / 4)

 /* SPI controller registers and bits */
 #define R_SPI_CONF        (0x00 / 4)
 #define   SPI_CONF_ENABLE_W0   0
 #define R_SPI_CTRL0       (0x4 / 4)
 #define R_SPI_MISC_CTRL   (0x10 / 4)
 #define R_SPI_TIMINGS     (0x14 / 4)

 /*
  * Default segments mapping addresses and size for each slave per
  * controller. These can be changed when board is initialized with the
  * Segment Address Registers but they don't seem do be used on the
  * field.
  */
 static const AspeedSegments aspeed_segments_legacy[] = {
     { 0x10000000, 32 * 1024 * 1024 },
 };

 static const AspeedSegments aspeed_segments_fmc[] = {
     { 0x20000000, 64 * 1024 * 1024 },
     { 0x24000000, 32 * 1024 * 1024 },
     { 0x26000000, 32 * 1024 * 1024 },
     { 0x28000000, 32 * 1024 * 1024 },
     { 0x2A000000, 32 * 1024 * 1024 }
 };

 static const AspeedSegments aspeed_segments_spi[] = {
     { 0x30000000, 64 * 1024 * 1024 },
 };

 static const AspeedSMCController controllers[] = {
     { "aspeed.smc.smc", R_CONF, R_CE_CTRL, R_CTRL0, R_TIMINGS,
       CONF_ENABLE_W0, 5, aspeed_segments_legacy, 0x6000000 },
     { "aspeed.smc.fmc", R_CONF, R_CE_CTRL, R_CTRL0, R_TIMINGS,
       CONF_ENABLE_W0, 5, aspeed_segments_fmc, 0x10000000 },
     { "aspeed.smc.spi", R_SPI_CONF, 0xff, R_SPI_CTRL0, R_SPI_TIMINGS,
       SPI_CONF_ENABLE_W0, 1, aspeed_segments_spi, 0x10000000 },
 };

 static uint64_t aspeed_smc_flash_default_read(void *opaque, hwaddr addr,
                                               unsigned size)
 {
     qemu_log_mask(LOG_GUEST_ERROR, "%s: To 0x%" HWADDR_PRIx " of size %u"
                   PRIx64 "\n", __func__, addr, size);
     return 0;
 }

 static void aspeed_smc_flash_default_write(void *opaque, hwaddr addr,
                                            uint64_t data, unsigned size)
 {
    qemu_log_mask(LOG_GUEST_ERROR, "%s: To 0x%" HWADDR_PRIx " of size %u: 0x%"
                  PRIx64 "\n", __func__, addr, size, data);
 }

 static const MemoryRegionOps aspeed_smc_flash_default_ops = {
     .read = aspeed_smc_flash_default_read,
     .write = aspeed_smc_flash_default_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
     .valid = {
         .min_access_size = 1,
         .max_access_size = 4,
     },
 };

 static inline int aspeed_smc_flash_mode(const AspeedSMCState *s, int cs)
 {
     return s->regs[s->r_ctrl0 + cs] & CTRL_CMD_MODE_MASK;
 }

 static inline bool aspeed_smc_is_usermode(const AspeedSMCState *s, int cs)
 {
     return aspeed_smc_flash_mode(s, cs) == CTRL_USERMODE;
 }

 static inline bool aspeed_smc_is_writable(const AspeedSMCState *s, int cs)
 {
     return s->regs[s->r_conf] & (1 << (s->conf_enable_w0 + cs));
 }

 static uint64_t aspeed_smc_flash_read(void *opaque, hwaddr addr, unsigned size)
 {
     AspeedSMCFlash *fl = opaque;
     const AspeedSMCState *s = fl->controller;
     uint64_t ret = 0;
     int i;

     if (aspeed_smc_is_usermode(s, fl->id)) {
         for (i = 0; i < size; i++) {
             ret |= ssi_transfer(s->spi, 0x0) << (8 * i);
         }
     } else {
         qemu_log_mask(LOG_UNIMP, "%s: usermode not implemented\n",
                       __func__);
         ret = -1;
     }

     return ret;
 }

 static void aspeed_smc_flash_write(void *opaque, hwaddr addr, uint64_t data,
                            unsigned size)
 {
     AspeedSMCFlash *fl = opaque;
     const AspeedSMCState *s = fl->controller;
     int i;

     if (!aspeed_smc_is_writable(s, fl->id)) {
         qemu_log_mask(LOG_GUEST_ERROR, "%s: flash is not writable at 0x%"
                       HWADDR_PRIx "\n", __func__, addr);
         return;
     }

     if (!aspeed_smc_is_usermode(s, fl->id)) {
         qemu_log_mask(LOG_UNIMP, "%s: usermode not implemented\n",
                       __func__);
         return;
     }

     for (i = 0; i < size; i++) {
         ssi_transfer(s->spi, (data >> (8 * i)) & 0xff);
     }
 }

 static const MemoryRegionOps aspeed_smc_flash_ops = {
     .read = aspeed_smc_flash_read,
     .write = aspeed_smc_flash_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
     .valid = {
         .min_access_size = 1,
         .max_access_size = 4,
     },
 };

 static bool aspeed_smc_is_ce_stop_active(const AspeedSMCState *s, int cs)
 {
     return s->regs[s->r_ctrl0 + cs] & CTRL_CE_STOP_ACTIVE;
 }

 static void aspeed_smc_update_cs(const AspeedSMCState *s)
 {
     int i;

     for (i = 0; i < s->num_cs; ++i) {
         qemu_set_irq(s->cs_lines[i], aspeed_smc_is_ce_stop_active(s, i));
     }
 }

 static void aspeed_smc_reset(DeviceState *d)
 {
     AspeedSMCState *s = ASPEED_SMC(d);
     int i;

     memset(s->regs, 0, sizeof s->regs);

     /* Pretend DMA is done (u-boot initialization) */
     s->regs[R_INTR_CTRL] = INTR_CTRL_DMA_STATUS;

     /* Unselect all slaves */
     for (i = 0; i < s->num_cs; ++i) {
         s->regs[s->r_ctrl0 + i] |= CTRL_CE_STOP_ACTIVE;
     }

     aspeed_smc_update_cs(s);
 }

 static uint64_t aspeed_smc_read(void *opaque, hwaddr addr, unsigned int size)
 {
     AspeedSMCState *s = ASPEED_SMC(opaque);

     addr >>= 2;

     if (addr >= ARRAY_SIZE(s->regs)) {
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Out-of-bounds read at 0x%" HWADDR_PRIx "\n",
                       __func__, addr);
         return 0;
     }

     if (addr == s->r_conf ||
         addr == s->r_timings ||
         addr == s->r_ce_ctrl ||
         addr == R_INTR_CTRL ||
         (addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->num_cs)) {
         return s->regs[addr];
     } else {
         qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
                       __func__, addr);
         return 0;
     }
 }

 static void aspeed_smc_write(void *opaque, hwaddr addr, uint64_t data,
                              unsigned int size)
 {
     AspeedSMCState *s = ASPEED_SMC(opaque);
     uint32_t value = data;

     addr >>= 2;

     if (addr >= ARRAY_SIZE(s->regs)) {
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Out-of-bounds write at 0x%" HWADDR_PRIx "\n",
                       __func__, addr);
         return;
     }

     if (addr == s->r_conf ||
         addr == s->r_timings ||
         addr == s->r_ce_ctrl) {
         s->regs[addr] = value;
     } else if (addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->num_cs) {
         s->regs[addr] = value;
         aspeed_smc_update_cs(s);
     } else {
         qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
                       __func__, addr);
         return;
     }
 }

 static const MemoryRegionOps aspeed_smc_ops = {
     .read = aspeed_smc_read,
     .write = aspeed_smc_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
     .valid.unaligned = true,
 };

 static void aspeed_smc_realize(DeviceState *dev, Error **errp)
 {
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
     AspeedSMCState *s = ASPEED_SMC(dev);
     AspeedSMCClass *mc = ASPEED_SMC_GET_CLASS(s);
     int i;
     char name[32];
     hwaddr offset = 0;

     s->ctrl = mc->ctrl;

     /* keep a copy under AspeedSMCState to speed up accesses */
     s->r_conf = s->ctrl->r_conf;
     s->r_ce_ctrl = s->ctrl->r_ce_ctrl;
     s->r_ctrl0 = s->ctrl->r_ctrl0;
     s->r_timings = s->ctrl->r_timings;
     s->conf_enable_w0 = s->ctrl->conf_enable_w0;

     /* Enforce some real HW limits */
     if (s->num_cs > s->ctrl->max_slaves) {
         qemu_log_mask(LOG_GUEST_ERROR, "%s: num_cs cannot exceed: %d\n",
                       __func__, s->ctrl->max_slaves);
         s->num_cs = s->ctrl->max_slaves;
     }

     s->spi = ssi_create_bus(dev, "spi");

     /* Setup cs_lines for slaves */
     sysbus_init_irq(sbd, &s->irq);
     s->cs_lines = g_new0(qemu_irq, s->num_cs);
     ssi_auto_connect_slaves(dev, s->cs_lines, s->spi);

     for (i = 0; i < s->num_cs; ++i) {
         sysbus_init_irq(sbd, &s->cs_lines[i]);
     }

     aspeed_smc_reset(dev);

     memory_region_init_io(&s->mmio, OBJECT(s), &aspeed_smc_ops, s,
                           s->ctrl->name, ASPEED_SMC_R_MAX * 4);
     sysbus_init_mmio(sbd, &s->mmio);

     /*
      * Memory region where flash modules are remapped
      */
     snprintf(name, sizeof(name), "%s.flash", s->ctrl->name);

     memory_region_init_io(&s->mmio_flash, OBJECT(s),
                           &aspeed_smc_flash_default_ops, s, name,
                           s->ctrl->mapping_window_size);
     sysbus_init_mmio(sbd, &s->mmio_flash);

     s->flashes = g_new0(AspeedSMCFlash, s->num_cs);

     for (i = 0; i < s->num_cs; ++i) {
         AspeedSMCFlash *fl = &s->flashes[i];

         snprintf(name, sizeof(name), "%s.%d", s->ctrl->name, i);

         fl->id = i;
         fl->controller = s;
         fl->size = s->ctrl->segments[i].size;
         memory_region_init_io(&fl->mmio, OBJECT(s), &aspeed_smc_flash_ops,
                               fl, name, fl->size);
         memory_region_add_subregion(&s->mmio_flash, offset, &fl->mmio);
         offset += fl->size;
     }
 }

 static const VMStateDescription vmstate_aspeed_smc = {
     .name = "aspeed.smc",
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32_ARRAY(regs, AspeedSMCState, ASPEED_SMC_R_MAX),
         VMSTATE_END_OF_LIST()
     }
 };

 static Property aspeed_smc_properties[] = {
     DEFINE_PROP_UINT32("num-cs", AspeedSMCState, num_cs, 1),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void aspeed_smc_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     AspeedSMCClass *mc = ASPEED_SMC_CLASS(klass);

     dc->realize = aspeed_smc_realize;
     dc->reset = aspeed_smc_reset;
     dc->props = aspeed_smc_properties;
     dc->vmsd = &vmstate_aspeed_smc;
     mc->ctrl = data;
 }

 static const TypeInfo aspeed_smc_info = {
     .name           = TYPE_ASPEED_SMC,
     .parent         = TYPE_SYS_BUS_DEVICE,
     .instance_size  = sizeof(AspeedSMCState),
     .class_size     = sizeof(AspeedSMCClass),
     .abstract       = true,
 };

 static void aspeed_smc_register_types(void)
 {
     int i;

     type_register_static(&aspeed_smc_info);
     for (i = 0; i < ARRAY_SIZE(controllers); ++i) {
         TypeInfo ti = {
             .name       = controllers[i].name,
             .parent     = TYPE_ASPEED_SMC,
             .class_init = aspeed_smc_class_init,
             .class_data = (void *)&controllers[i],
         };
         type_register(&ti);
     }
 }

 type_init(aspeed_smc_register_types)
	/*
	* ASPEED AST2400 SMC Controller (SPI Flash Only)
	*
	* Copyright (C) 2016 IBM Corp.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/

	#include "qemu/osdep.h"
	#include "hw/sysbus.h"
	#include "sysemu/sysemu.h"
	#include "qemu/log.h"
	#include "include/qemu/error-report.h"
	#include "exec/address-spaces.h"

	#include "hw/ssi/aspeed_smc.h"

	/* CE Type Setting Register */
	#define R_CONF (0x00 / 4)
	#define CONF_LEGACY_DISABLE (1 << 31)
	#define CONF_ENABLE_W4 20
	#define CONF_ENABLE_W3 19
	#define CONF_ENABLE_W2 18
	#define CONF_ENABLE_W1 17
	#define CONF_ENABLE_W0 16
	#define CONF_FLASH_TYPE4 9
	#define CONF_FLASH_TYPE3 7
	#define CONF_FLASH_TYPE2 5
	#define CONF_FLASH_TYPE1 3
	#define CONF_FLASH_TYPE0 1

	/* CE Control Register */
	#define R_CE_CTRL (0x04 / 4)
	#define CTRL_EXTENDED4 4 /* 32 bit addressing for SPI */
	#define CTRL_EXTENDED3 3 /* 32 bit addressing for SPI */
	#define CTRL_EXTENDED2 2 /* 32 bit addressing for SPI */
	#define CTRL_EXTENDED1 1 /* 32 bit addressing for SPI */
	#define CTRL_EXTENDED0 0 /* 32 bit addressing for SPI */

	/* Interrupt Control and Status Register */
	#define R_INTR_CTRL (0x08 / 4)
	#define INTR_CTRL_DMA_STATUS (1 << 11)
	#define INTR_CTRL_CMD_ABORT_STATUS (1 << 10)
	#define INTR_CTRL_WRITE_PROTECT_STATUS (1 << 9)
	#define INTR_CTRL_DMA_EN (1 << 3)
	#define INTR_CTRL_CMD_ABORT_EN (1 << 2)
	#define INTR_CTRL_WRITE_PROTECT_EN (1 << 1)

	/* CEx Control Register */
	#define R_CTRL0 (0x10 / 4)
	#define CTRL_CMD_SHIFT 16
	#define CTRL_CMD_MASK 0xff
	#define CTRL_CE_STOP_ACTIVE (1 << 2)
	#define CTRL_CMD_MODE_MASK 0x3
	#define CTRL_READMODE 0x0
	#define CTRL_FREADMODE 0x1
	#define CTRL_WRITEMODE 0x2
	#define CTRL_USERMODE 0x3
	#define R_CTRL1 (0x14 / 4)
	#define R_CTRL2 (0x18 / 4)
	#define R_CTRL3 (0x1C / 4)
	#define R_CTRL4 (0x20 / 4)

	/* CEx Segment Address Register */
	#define R_SEG_ADDR0 (0x30 / 4)
	#define SEG_SIZE_SHIFT 24 /* 8MB units */
	#define SEG_SIZE_MASK 0x7f
	#define SEG_START_SHIFT 16 /* address bit [A29-A23] */
	#define SEG_START_MASK 0x7f
	#define R_SEG_ADDR1 (0x34 / 4)
	#define R_SEG_ADDR2 (0x38 / 4)
	#define R_SEG_ADDR3 (0x3C / 4)
	#define R_SEG_ADDR4 (0x40 / 4)

	/* Misc Control Register #1 */
	#define R_MISC_CTRL1 (0x50 / 4)

	/* Misc Control Register #2 */
	#define R_MISC_CTRL2 (0x54 / 4)

	/* DMA Control/Status Register */
	#define R_DMA_CTRL (0x80 / 4)
	#define DMA_CTRL_DELAY_MASK 0xf
	#define DMA_CTRL_DELAY_SHIFT 8
	#define DMA_CTRL_FREQ_MASK 0xf
	#define DMA_CTRL_FREQ_SHIFT 4
	#define DMA_CTRL_MODE (1 << 3)
	#define DMA_CTRL_CKSUM (1 << 2)
	#define DMA_CTRL_DIR (1 << 1)
	#define DMA_CTRL_EN (1 << 0)

	/* DMA Flash Side Address */
	#define R_DMA_FLASH_ADDR (0x84 / 4)

	/* DMA DRAM Side Address */
	#define R_DMA_DRAM_ADDR (0x88 / 4)

	/* DMA Length Register */
	#define R_DMA_LEN (0x8C / 4)

	/* Checksum Calculation Result */
	#define R_DMA_CHECKSUM (0x90 / 4)

	/* Misc Control Register #2 */
	#define R_TIMINGS (0x94 / 4)

	/* SPI controller registers and bits */
	#define R_SPI_CONF (0x00 / 4)
	#define SPI_CONF_ENABLE_W0 0
	#define R_SPI_CTRL0 (0x4 / 4)
	#define R_SPI_MISC_CTRL (0x10 / 4)
	#define R_SPI_TIMINGS (0x14 / 4)

	/*
	* Default segments mapping addresses and size for each slave per
	* controller. These can be changed when board is initialized with the
	* Segment Address Registers but they don't seem do be used on the
	* field.
	*/
	static const AspeedSegments aspeed_segments_legacy[] = {
	{ 0x10000000, 32 * 1024 * 1024 },
	};

	static const AspeedSegments aspeed_segments_fmc[] = {
	{ 0x20000000, 64 * 1024 * 1024 },
	{ 0x24000000, 32 * 1024 * 1024 },
	{ 0x26000000, 32 * 1024 * 1024 },
	{ 0x28000000, 32 * 1024 * 1024 },
	{ 0x2A000000, 32 * 1024 * 1024 }
	};

	static const AspeedSegments aspeed_segments_spi[] = {
	{ 0x30000000, 64 * 1024 * 1024 },
	};

	static const AspeedSMCController controllers[] = {
	{ "aspeed.smc.smc", R_CONF, R_CE_CTRL, R_CTRL0, R_TIMINGS,
	CONF_ENABLE_W0, 5, aspeed_segments_legacy, 0x6000000 },
	{ "aspeed.smc.fmc", R_CONF, R_CE_CTRL, R_CTRL0, R_TIMINGS,
	CONF_ENABLE_W0, 5, aspeed_segments_fmc, 0x10000000 },
	{ "aspeed.smc.spi", R_SPI_CONF, 0xff, R_SPI_CTRL0, R_SPI_TIMINGS,
	SPI_CONF_ENABLE_W0, 1, aspeed_segments_spi, 0x10000000 },
	};

	static uint64_t aspeed_smc_flash_default_read(void *opaque, hwaddr addr,
	unsigned size)
	{
	qemu_log_mask(LOG_GUEST_ERROR, "%s: To 0x%" HWADDR_PRIx " of size %u"
	PRIx64 "\n", __func__, addr, size);
	return 0;
	}

	static void aspeed_smc_flash_default_write(void *opaque, hwaddr addr,
	uint64_t data, unsigned size)
	{
	qemu_log_mask(LOG_GUEST_ERROR, "%s: To 0x%" HWADDR_PRIx " of size %u: 0x%"
	PRIx64 "\n", __func__, addr, size, data);
	}

	static const MemoryRegionOps aspeed_smc_flash_default_ops = {
	.read = aspeed_smc_flash_default_read,
	.write = aspeed_smc_flash_default_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	.valid = {
	.min_access_size = 1,
	.max_access_size = 4,
	},
	};

	static inline int aspeed_smc_flash_mode(const AspeedSMCState *s, int cs)
	{
	return s->regs[s->r_ctrl0 + cs] & CTRL_CMD_MODE_MASK;
	}

	static inline bool aspeed_smc_is_usermode(const AspeedSMCState *s, int cs)
	{
	return aspeed_smc_flash_mode(s, cs) == CTRL_USERMODE;
	}

	static inline bool aspeed_smc_is_writable(const AspeedSMCState *s, int cs)
	{
	return s->regs[s->r_conf] & (1 << (s->conf_enable_w0 + cs));
	}

	static uint64_t aspeed_smc_flash_read(void *opaque, hwaddr addr, unsigned size)
	{
	AspeedSMCFlash *fl = opaque;
	const AspeedSMCState *s = fl->controller;
	uint64_t ret = 0;
	int i;

	if (aspeed_smc_is_usermode(s, fl->id)) {
	for (i = 0; i < size; i++) {
	ret \|= ssi_transfer(s->spi, 0x0) << (8 * i);
	}
	} else {
	qemu_log_mask(LOG_UNIMP, "%s: usermode not implemented\n",
	__func__);
	ret = -1;
	}

	return ret;
	}

	static void aspeed_smc_flash_write(void *opaque, hwaddr addr, uint64_t data,
	unsigned size)
	{
	AspeedSMCFlash *fl = opaque;
	const AspeedSMCState *s = fl->controller;
	int i;

	if (!aspeed_smc_is_writable(s, fl->id)) {
	qemu_log_mask(LOG_GUEST_ERROR, "%s: flash is not writable at 0x%"
	HWADDR_PRIx "\n", __func__, addr);
	return;
	}

	if (!aspeed_smc_is_usermode(s, fl->id)) {
	qemu_log_mask(LOG_UNIMP, "%s: usermode not implemented\n",
	__func__);
	return;
	}

	for (i = 0; i < size; i++) {
	ssi_transfer(s->spi, (data >> (8 * i)) & 0xff);
	}
	}

	static const MemoryRegionOps aspeed_smc_flash_ops = {
	.read = aspeed_smc_flash_read,
	.write = aspeed_smc_flash_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	.valid = {
	.min_access_size = 1,
	.max_access_size = 4,
	},
	};

	static bool aspeed_smc_is_ce_stop_active(const AspeedSMCState *s, int cs)
	{
	return s->regs[s->r_ctrl0 + cs] & CTRL_CE_STOP_ACTIVE;
	}

	static void aspeed_smc_update_cs(const AspeedSMCState *s)
	{
	int i;

	for (i = 0; i < s->num_cs; ++i) {
	qemu_set_irq(s->cs_lines[i], aspeed_smc_is_ce_stop_active(s, i));
	}
	}

	static void aspeed_smc_reset(DeviceState *d)
	{
	AspeedSMCState *s = ASPEED_SMC(d);
	int i;

	memset(s->regs, 0, sizeof s->regs);

	/* Pretend DMA is done (u-boot initialization) */
	s->regs[R_INTR_CTRL] = INTR_CTRL_DMA_STATUS;

	/* Unselect all slaves */
	for (i = 0; i < s->num_cs; ++i) {
	s->regs[s->r_ctrl0 + i] \|= CTRL_CE_STOP_ACTIVE;
	}

	aspeed_smc_update_cs(s);
	}

	static uint64_t aspeed_smc_read(void *opaque, hwaddr addr, unsigned int size)
	{
	AspeedSMCState *s = ASPEED_SMC(opaque);

	addr >>= 2;

	if (addr >= ARRAY_SIZE(s->regs)) {
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Out-of-bounds read at 0x%" HWADDR_PRIx "\n",
	__func__, addr);
	return 0;
	}

	if (addr == s->r_conf \|\|
	addr == s->r_timings \|\|
	addr == s->r_ce_ctrl \|\|
	addr == R_INTR_CTRL \|\|
	(addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->num_cs)) {
	return s->regs[addr];
	} else {
	qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
	__func__, addr);
	return 0;
	}
	}

	static void aspeed_smc_write(void *opaque, hwaddr addr, uint64_t data,
	unsigned int size)
	{
	AspeedSMCState *s = ASPEED_SMC(opaque);
	uint32_t value = data;

	addr >>= 2;

	if (addr >= ARRAY_SIZE(s->regs)) {
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Out-of-bounds write at 0x%" HWADDR_PRIx "\n",
	__func__, addr);
	return;
	}

	if (addr == s->r_conf \|\|
	addr == s->r_timings \|\|
	addr == s->r_ce_ctrl) {
	s->regs[addr] = value;
	} else if (addr >= s->r_ctrl0 && addr < s->r_ctrl0 + s->num_cs) {
	s->regs[addr] = value;
	aspeed_smc_update_cs(s);
	} else {
	qemu_log_mask(LOG_UNIMP, "%s: not implemented: 0x%" HWADDR_PRIx "\n",
	__func__, addr);
	return;
	}
	}

	static const MemoryRegionOps aspeed_smc_ops = {
	.read = aspeed_smc_read,
	.write = aspeed_smc_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	.valid.unaligned = true,
	};

	static void aspeed_smc_realize(DeviceState dev, Error *errp)
	{
	SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
	AspeedSMCState *s = ASPEED_SMC(dev);
	AspeedSMCClass *mc = ASPEED_SMC_GET_CLASS(s);
	int i;
	char name[32];
	hwaddr offset = 0;

	s->ctrl = mc->ctrl;

	/* keep a copy under AspeedSMCState to speed up accesses */
	s->r_conf = s->ctrl->r_conf;
	s->r_ce_ctrl = s->ctrl->r_ce_ctrl;
	s->r_ctrl0 = s->ctrl->r_ctrl0;
	s->r_timings = s->ctrl->r_timings;
	s->conf_enable_w0 = s->ctrl->conf_enable_w0;

	/* Enforce some real HW limits */
	if (s->num_cs > s->ctrl->max_slaves) {
	qemu_log_mask(LOG_GUEST_ERROR, "%s: num_cs cannot exceed: %d\n",
	__func__, s->ctrl->max_slaves);
	s->num_cs = s->ctrl->max_slaves;
	}

	s->spi = ssi_create_bus(dev, "spi");

	/* Setup cs_lines for slaves */
	sysbus_init_irq(sbd, &s->irq);
	s->cs_lines = g_new0(qemu_irq, s->num_cs);
	ssi_auto_connect_slaves(dev, s->cs_lines, s->spi);

	for (i = 0; i < s->num_cs; ++i) {
	sysbus_init_irq(sbd, &s->cs_lines[i]);
	}

	aspeed_smc_reset(dev);

	memory_region_init_io(&s->mmio, OBJECT(s), &aspeed_smc_ops, s,
	s->ctrl->name, ASPEED_SMC_R_MAX * 4);
	sysbus_init_mmio(sbd, &s->mmio);

	/*
	* Memory region where flash modules are remapped
	*/
	snprintf(name, sizeof(name), "%s.flash", s->ctrl->name);

	memory_region_init_io(&s->mmio_flash, OBJECT(s),
	&aspeed_smc_flash_default_ops, s, name,
	s->ctrl->mapping_window_size);
	sysbus_init_mmio(sbd, &s->mmio_flash);

	s->flashes = g_new0(AspeedSMCFlash, s->num_cs);

	for (i = 0; i < s->num_cs; ++i) {
	AspeedSMCFlash *fl = &s->flashes[i];

	snprintf(name, sizeof(name), "%s.%d", s->ctrl->name, i);

	fl->id = i;
	fl->controller = s;
	fl->size = s->ctrl->segments[i].size;
	memory_region_init_io(&fl->mmio, OBJECT(s), &aspeed_smc_flash_ops,
	fl, name, fl->size);
	memory_region_add_subregion(&s->mmio_flash, offset, &fl->mmio);
	offset += fl->size;
	}
	}

	static const VMStateDescription vmstate_aspeed_smc = {
	.name = "aspeed.smc",
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (VMStateField[]) {
	VMSTATE_UINT32_ARRAY(regs, AspeedSMCState, ASPEED_SMC_R_MAX),
	VMSTATE_END_OF_LIST()
	}
	};

	static Property aspeed_smc_properties[] = {
	DEFINE_PROP_UINT32("num-cs", AspeedSMCState, num_cs, 1),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void aspeed_smc_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	AspeedSMCClass *mc = ASPEED_SMC_CLASS(klass);

	dc->realize = aspeed_smc_realize;
	dc->reset = aspeed_smc_reset;
	dc->props = aspeed_smc_properties;
	dc->vmsd = &vmstate_aspeed_smc;
	mc->ctrl = data;
	}

	static const TypeInfo aspeed_smc_info = {
	.name = TYPE_ASPEED_SMC,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(AspeedSMCState),
	.class_size = sizeof(AspeedSMCClass),
	.abstract = true,
	};

	static void aspeed_smc_register_types(void)
	{
	int i;

	type_register_static(&aspeed_smc_info);
	for (i = 0; i < ARRAY_SIZE(controllers); ++i) {
	TypeInfo ti = {
	.name = controllers[i].name,
	.parent = TYPE_ASPEED_SMC,
	.class_init = aspeed_smc_class_init,
	.class_data = (void *)&controllers[i],
	};
	type_register(&ti);
	}
	}

	type_init(aspeed_smc_register_types)