Patchwork [v2,1/2] SDHCI: inital version

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Submitter Peter A. G. Crosthwaite
Date April 3, 2012, 6:17 a.m.
Message ID <93cf7bb1ab29e6c79ecd93f32b50c52b816cd10d.1333433027.git.peter.crosthwaite@petalogix.com>
Download mbox | patch
Permalink /patch/150327/
State New
Headers show

Comments

Peter A. G. Crosthwaite - April 3, 2012, 6:17 a.m.
Device model for standard SD Host Controller Interface (SDHCI).

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
---
changed from v1:
Made undefined op behaviour consisistent.
fixed compile warning.

 Makefile.target |    1 +
 hw/sdhci.c      |  736 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 737 insertions(+), 0 deletions(-)
 create mode 100644 hw/sdhci.c

Patch

diff --git a/Makefile.target b/Makefile.target
index 9b0cf74..c118dc6 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -363,6 +363,7 @@  obj-arm-y += versatile_pci.o
 obj-arm-y += cadence_uart.o
 obj-arm-y += cadence_ttc.o
 obj-arm-y += cadence_gem.o
+obj-arm-y += sdhci.o
 obj-arm-y += xilinx_zynq.o zynq_slcr.o
 obj-arm-y += realview_gic.o realview.o arm_sysctl.o arm11mpcore.o a9mpcore.o
 obj-arm-y += exynos4210_gic.o exynos4210_combiner.o exynos4210.o
diff --git a/hw/sdhci.c b/hw/sdhci.c
new file mode 100644
index 0000000..b387013
--- /dev/null
+++ b/hw/sdhci.c
@@ -0,0 +1,736 @@ 
+/*
+ * Copyright 2011 Google Inc.
+ * Copyright (C) 2012 Peter A.G. Crosthwaite <peter.crosthwaite@petalogix.com>
+ * Copyright (C) 2012 PetaLogix Pty Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ *
+ * SDHCI (SD Host Controler Interface) emulation
+ */
+
+#include "blockdev.h"
+#include "sysbus.h"
+#include "sd.h"
+
+#ifdef SDHCI_ERR_DEBUG
+#define DB_PRINT(...) do { \
+    fprintf(stderr,  ": %s: ", __func__); \
+    fprintf(stderr, ## __VA_ARGS__); \
+    } while (0);
+#else
+    #define DB_PRINT(...)
+#endif
+
+
+/* Controller registers */
+
+#define SDHCI_DMA_ADDRESS       0x00
+
+#define SDHCI_BLOCK_SIZE        0x04
+
+#define SDHCI_BLOCK_COUNT       0x06
+
+#define SDHCI_ARGUMENT          0x08
+
+#define SDHCI_TRANSFER_MODE     0x0C
+#define  SDHCI_TRNS_DMA         0x01
+#define  SDHCI_TRNS_BLK_CNT_EN  0x02
+#define  SDHCI_TRNS_ACMD12      0x04
+#define  SDHCI_TRNS_READ        0x10
+#define  SDHCI_TRNS_MULTI       0x20
+
+#define SDHCI_COMMAND           0x0E
+#define  SDHCI_CMD_RESP_MASK    0x03
+#define  SDHCI_CMD_CRC          0x08
+#define  SDHCI_CMD_INDEX        0x10
+#define  SDHCI_CMD_DATA         0x20
+
+#define  SDHCI_CMD_RESP_NONE    0x00
+#define  SDHCI_CMD_RESP_LONG    0x01
+#define  SDHCI_CMD_RESP_SHORT   0x02
+#define  SDHCI_CMD_RESP_SHORT_BUSY 0x03
+
+#define SDHCI_RESPONSE          0x10
+
+#define SDHCI_BUFFER            0x20
+
+#define SDHCI_PRESENT_STATE     0x24
+#define  SDHCI_CMD_INHIBIT      0x00000001
+#define  SDHCI_DATA_INHIBIT     0x00000002
+#define  SDHCI_DOING_WRITE      0x00000100
+#define  SDHCI_DOING_READ       0x00000200
+#define  SDHCI_SPACE_AVAILABLE  0x00000400
+#define  SDHCI_DATA_AVAILABLE   0x00000800
+#define  SDHCI_CARD_PRESENT     0x00010000
+#define  SDHCI_WRITE_PROTECT    0x00080000
+
+#define SDHCI_HOST_CONTROL      0x28
+#define  SDHCI_CTRL_LED         0x01
+#define  SDHCI_CTRL_4BITBUS     0x02
+#define  SDHCI_CTRL_HISPD       0x04
+#define  SDHCI_CTRL_DMA_MASK    0x18
+#define   SDHCI_CTRL_SDMA       0x00
+#define   SDHCI_CTRL_ADMA1      0x08
+#define   SDHCI_CTRL_ADMA32     0x10
+#define   SDHCI_CTRL_ADMA64     0x18
+#define   SDHCI_CTRL_8BITBUS    0x20
+
+#define SDHCI_POWER_CONTROL     0x29
+#define  SDHCI_POWER_ON         0x01
+#define  SDHCI_POWER_180        0x0A
+#define  SDHCI_POWER_300        0x0C
+#define  SDHCI_POWER_330        0x0E
+
+#define SDHCI_BLOCK_GAP_CONTROL 0x2A
+
+#define SDHCI_WAKE_UP_CONTROL   0x2B
+#define  SDHCI_WAKE_ON_INT      0x01
+#define  SDHCI_WAKE_ON_INSERT   0x02
+#define  SDHCI_WAKE_ON_REMOVE   0x04
+
+#define SDHCI_CLOCK_CONTROL     0x2C
+#define  SDHCI_DIVIDER_SHIFT    8
+#define  SDHCI_DIVIDER_HI_SHIFT 6
+#define  SDHCI_DIV_MASK 0xFF
+#define  SDHCI_DIV_MASK_LEN     8
+#define  SDHCI_DIV_HI_MASK      0x300
+#define  SDHCI_CLOCK_CARD_EN    0x0004
+#define  SDHCI_CLOCK_INT_STABLE 0x0002
+#define  SDHCI_CLOCK_INT_EN     0x0001
+
+#define SDHCI_TIMEOUT_CONTROL   0x2E
+
+#define SDHCI_SOFTWARE_RESET    0x2F
+#define  SDHCI_RESET_ALL        0x01
+#define  SDHCI_RESET_CMD        0x02
+#define  SDHCI_RESET_DATA       0x04
+
+#define SDHCI_INT_STATUS        0x30
+#define SDHCI_INT_ENABLE        0x34
+#define SDHCI_SIGNAL_ENABLE     0x38
+#define  SDHCI_INT_RESPONSE     0x00000001
+#define  SDHCI_INT_DATA_END     0x00000002
+#define  SDHCI_INT_DMA_END      0x00000008
+#define  SDHCI_INT_SPACE_AVAIL  0x00000010
+#define  SDHCI_INT_DATA_AVAIL   0x00000020
+#define  SDHCI_INT_CARD_INSERT  0x00000040
+#define  SDHCI_INT_CARD_REMOVE  0x00000080
+#define  SDHCI_INT_CARD_INT     0x00000100
+#define  SDHCI_INT_ERROR        0x00008000
+#define  SDHCI_INT_TIMEOUT      0x00010000
+#define  SDHCI_INT_CRC          0x00020000
+#define  SDHCI_INT_END_BIT      0x00040000
+#define  SDHCI_INT_INDEX        0x00080000
+#define  SDHCI_INT_DATA_TIMEOUT 0x00100000
+#define  SDHCI_INT_DATA_CRC     0x00200000
+#define  SDHCI_INT_DATA_END_BIT 0x00400000
+#define  SDHCI_INT_BUS_POWER    0x00800000
+#define  SDHCI_INT_ACMD12ERR    0x01000000
+#define  SDHCI_INT_ADMA_ERROR   0x02000000
+
+#define  SDHCI_INT_NORMAL_MASK  0x00007FFF
+#define  SDHCI_INT_ERROR_MASK   0xFFFF8000
+
+#define SDHCI_ACMD12_ERR        0x3C
+
+/* 3E-3F reserved */
+
+#define SDHCI_CAPABILITIES      0x40
+#define  SDHCI_TIMEOUT_CLK_MASK 0x0000003F
+#define  SDHCI_TIMEOUT_CLK_SHIFT 0
+#define  SDHCI_TIMEOUT_CLK_UNIT 0x00000080
+#define  SDHCI_CLOCK_BASE_MASK  0x00003F00
+#define  SDHCI_CLOCK_V3_BASE_MASK       0x0000FF00
+#define  SDHCI_CLOCK_BASE_SHIFT 8
+#define  SDHCI_MAX_BLOCK_MASK   0x00030000
+#define  SDHCI_MAX_BLOCK_SHIFT  16
+#define  SDHCI_CAN_DO_8BIT      0x00040000
+#define  SDHCI_CAN_DO_ADMA2     0x00080000
+#define  SDHCI_CAN_DO_ADMA1     0x00100000
+#define  SDHCI_CAN_DO_HISPD     0x00200000
+#define  SDHCI_CAN_DO_SDMA      0x00400000
+#define  SDHCI_CAN_VDD_330      0x01000000
+#define  SDHCI_CAN_VDD_300      0x02000000
+#define  SDHCI_CAN_VDD_180      0x04000000
+#define  SDHCI_CAN_64BIT        0x10000000
+#define  SDHCI_SLOT_TYPE_EMBED  0x40000000
+
+#define SDHCI_CAPABILITIES_1    0x44
+
+/* 44-47 reserved for more caps */
+
+#define SDHCI_MAX_CURRENT       0x48
+
+/* 4C-4F reserved for more max current */
+
+#define SDHCI_SET_ACMD12_ERROR  0x50
+#define SDHCI_SET_INT_ERROR     0x52
+
+#define SDHCI_ADMA_ERROR        0x54
+
+/* 55-57 reserved */
+
+#define SDHCI_ADMA_ADDRESS      0x58
+
+/* 60-FB reserved */
+
+#define SDHCI_SLOT_INT_STATUS   0xFC
+
+#define SDHCI_HOST_VERSION      0xFE
+#define  SDHCI_VENDOR_VER_MASK  0xFF00
+#define  SDHCI_VENDOR_VER_SHIFT 8
+#define  SDHCI_SPEC_VER_MASK    0x00FF
+#define  SDHCI_SPEC_VER_SHIFT   0
+#define   SDHCI_SPEC_100        0
+#define   SDHCI_SPEC_200        1
+#define   SDHCI_SPEC_300        2
+
+/* ADMA descriptor flags */
+#define ADMA_VALID   (1<<0)
+#define ADMA_END     (1<<1)
+#define ADMA_INT     (1<<2)
+
+#define ADMA_OP_MASK (3<<4)
+#define ADMA_OP_NOP  (0<<4)
+#define ADMA_OP_SET  (1<<4)
+#define ADMA_OP_TRAN (2<<4)
+#define ADMA_OP_LINK (3<<4)
+
+/* re-write a part of a variable using a mask
+ * to emulate the "byte-enable" behaviour in hardware
+ */
+#define MASKED_WRITE(var, val, mask) do {\
+        var = (var & ~(mask)) | ((val) & (mask));\
+    } while (0)
+
+typedef struct {
+    SysBusDevice busdev;
+    MemoryRegion iomem;
+    BlockDriverState *bs;
+    uint32_t sdma_address;
+    uint16_t block_size;
+    uint16_t block_count;
+    uint32_t arg;
+    uint16_t transfer_mode;
+    uint32_t response[4];
+    uint32_t clock;
+    uint32_t host_control;
+    uint32_t present_state;
+    uint32_t int_enable;
+    uint32_t int_status;
+    uint32_t adma_address;
+    uint8_t adma_error;
+    SDState *sd;
+    qemu_irq irq;
+    uint32_t pio_btt;
+} SDHCIState;
+
+static void sdhci_reset(DeviceState *d)
+{
+    SDHCIState *s = container_of(d, SDHCIState, busdev.qdev);
+
+    if (!s->bs) {
+        DriveInfo *inf = drive_get_next(IF_SD);
+        s->bs = inf ? inf->bdrv : NULL;
+    }
+    if (!s->sd && s->bs) {
+        s->sd = sd_init(s->bs, 0);
+    }
+
+    s->sdma_address = 0;
+    s->block_size = 0;
+    s->block_count = 0;
+    s->arg = 0;
+    s->transfer_mode = 0;
+    s->clock = SDHCI_CLOCK_INT_STABLE;
+    s->int_enable = 0;
+    s->int_status = 0;
+    s->adma_address = 0;
+    s->adma_error = 0;
+}
+
+static void sdhci_set_irq(SDHCIState *s)
+{
+    qemu_set_irq(s->irq, !!(s->int_status & s->int_enable));
+}
+
+static void sdhci_end_of_transfer(SDHCIState *s)
+{
+    DB_PRINT("\n");
+    SDRequest request;
+    uint8_t r[16];
+    request.cmd = 12;
+    request.arg = 0;
+    if (s->transfer_mode & SDHCI_TRNS_ACMD12) {
+        sd_do_command(s->sd, &request, r);
+    }
+    s->present_state &= ~(SDHCI_DOING_READ | SDHCI_DOING_WRITE);
+    s->int_status |= SDHCI_INT_DATA_END;
+    sdhci_set_irq(s);
+}
+
+static void pio_end_of_block(SDHCIState *s)
+{
+    DB_PRINT("\n");
+    if (!(s->transfer_mode & SDHCI_TRNS_MULTI)) {
+        sdhci_end_of_transfer(s);
+        return;
+    }
+
+    if ((s->transfer_mode & SDHCI_TRNS_BLK_CNT_EN)) {
+        if (!s->block_count) {
+            sdhci_end_of_transfer(s);
+            return;
+        }
+        s->block_count--;
+    }
+    s->pio_btt = s->block_size;
+    s->int_status |=
+            (s->present_state & SDHCI_DOING_READ) ? SDHCI_INT_DATA_AVAIL : 0;
+    s->int_status |=
+            (s->present_state & SDHCI_DOING_WRITE) ? SDHCI_INT_SPACE_AVAIL : 0;
+}
+
+static uint32_t do_pio_read(SDHCIState *s)
+{
+    int i;
+    uint32_t ret = 0;
+    if (!(s->present_state & SDHCI_DOING_READ)) {
+        DB_PRINT("reading pio data register in non-write state");
+        return 0;
+    }
+    for (i = 0; i < 4; ++i) {
+        ret = (ret >> 8) | ((uint32_t)sd_read_data(s->sd) << 24);
+    }
+    s->pio_btt -= 4;
+    if (!s->pio_btt) {
+        pio_end_of_block(s);
+    }
+    return ret;
+}
+
+static void do_pio_write(SDHCIState *s, uint32_t value)
+{
+    int i;
+    DB_PRINT("btt:%x\n", s->pio_btt);
+    if (!(s->present_state & SDHCI_DOING_WRITE)) {
+        DB_PRINT("writing pio data register in non-write state");
+        return;
+    }
+    for (i = 0; i < 4; ++i) {
+        sd_write_data(s->sd, (value >> (i*8)) & 0xff);
+    }
+    s->pio_btt -= 4;
+    if (!s->pio_btt) {
+        pio_end_of_block(s);
+    }
+}
+
+static void sdhci_pio_transfer(SDHCIState *s)
+{
+    DB_PRINT("\n");
+    s->present_state |= (s->transfer_mode & SDHCI_TRNS_READ) ?
+        SDHCI_DOING_READ : SDHCI_DOING_WRITE;
+    pio_end_of_block(s);
+}
+
+
+struct adma_desc {
+    uint16_t flags;
+    uint16_t size;
+    uint32_t addr;
+};
+
+static int sdhci_get_adma_desc(SDHCIState *s, struct adma_desc *ret,
+                                                    uint32_t adma1_size)
+{
+    if (s->host_control & SDHCI_CTRL_ADMA32) { /* ADMA2 */
+        cpu_physical_memory_read(s->adma_address, (void *)ret, sizeof(*ret));
+        return sizeof(*ret);
+    } else { /* ADMA1 */
+        uint32_t adma1;
+        cpu_physical_memory_read(s->adma_address, (void *)&adma1,
+                                                        sizeof(adma1));
+        ret->addr = adma1 & 0xfffff000;
+        ret->size = adma1_size;
+        ret->flags = adma1 & 0x3f;
+        return sizeof(adma1);
+    }
+}
+
+static void sdhci_dma_transfer(SDHCIState *s)
+{
+    int b;
+    uint16_t xfer_size;
+
+    uint32_t total_size, remaining_size;
+
+    struct adma_desc desc;
+    int adma_stride = 0;
+    s->adma_error = 0;
+    uint32_t adma1_size = (4 << 10);
+
+    DB_PRINT("");
+
+    if (s->host_control & SDHCI_CTRL_DMA_MASK) {
+        adma_stride = sdhci_get_adma_desc(s, &desc, adma1_size);
+    } else { /* use SDMA */
+        /* Generate hardcoded descriptor to emulate ADMA */
+        desc.addr = s->sdma_address;
+        desc.size = s->block_count * (s->block_size & 0xfff);
+        desc.flags = ADMA_VALID | ADMA_END | ADMA_OP_TRAN;
+    }
+    /* 0 in the size field means 65536 bytes */
+    remaining_size = desc.size ? desc.size : 65536;
+
+    s->int_status |= SDHCI_INT_DATA_END;
+
+    total_size = s->block_count*(s->block_size & 0xfff);
+    while (total_size) {
+        /* if the descriptor is invalid OR the desciptor is done OR the
+         * descriptor is not a transfer operation ...
+         */
+        while (!(desc.flags & ADMA_VALID) || !remaining_size ||
+                ((desc.flags & ADMA_OP_MASK) != ADMA_OP_TRAN)) {
+            if ((desc.flags & ADMA_END) || !(desc.flags & ADMA_VALID)) {
+                /* Abort ADMA transfer */
+                s->int_status |= SDHCI_INT_ADMA_ERROR;
+                s->adma_error = 1 /* ST_FDS */;
+                s->block_count = total_size / s->block_size;
+                return;
+            }
+            /* ADMA operation */
+            if ((desc.flags & ADMA_OP_MASK) == ADMA_OP_SET) {
+                adma1_size = (desc.addr >> 12) & 0xFFFF;
+            }
+            if ((desc.flags & ADMA_OP_MASK) == ADMA_OP_LINK) {
+                s->adma_address = desc.addr;
+            } else {
+                s->adma_address += adma_stride;
+            }
+            adma_stride = sdhci_get_adma_desc(s, &desc, adma1_size);
+            /* 0 in the size field means 65536 bytes */
+            remaining_size = desc.size ? desc.size : 65536;
+        }
+
+        xfer_size = MIN((s->block_size & 0xfff), remaining_size);
+        for (b = 0; b < xfer_size; b++, desc.addr++) {
+            if (s->transfer_mode & SDHCI_TRNS_READ) {
+                uint8_t data = sd_read_data(s->sd);
+                cpu_physical_memory_write(desc.addr, &data, 1);
+            } else {
+                uint8_t data;
+                cpu_physical_memory_read(desc.addr, &data, 1);
+                sd_write_data(s->sd, data);
+            }
+        }
+        remaining_size -= xfer_size;
+        total_size -= xfer_size;
+    }
+    sdhci_end_of_transfer(s);
+    s->block_count = 0;
+}
+
+static void sdhci_command(SDHCIState *s, uint32_t cmd)
+{
+    SDRequest request;
+    int len;
+    uint8_t r[16];
+
+    DB_PRINT("SDHCI command %08x\n", cmd);
+    if (!s->sd) { /* no SD device attached to the controller */
+        s->int_status |= SDHCI_INT_TIMEOUT;
+        sdhci_set_irq(s);
+        return;
+    }
+
+    request.cmd = (cmd>>8) & 0xff;
+    request.arg = s->arg;
+    len = sd_do_command(s->sd, &request, r);
+    if (len == 0) {
+        if (cmd & SDHCI_CMD_RESP_MASK) {
+            /* no response expected */
+            s->int_status |= SDHCI_INT_INDEX;
+            DB_PRINT("no response expected %08x\n", cmd);
+        } else {
+            /* error */
+            s->int_status |= SDHCI_INT_RESPONSE;
+            DB_PRINT("error response %08x\n", cmd);
+        }
+    } else {
+        DB_PRINT("actual response %08x\n", cmd);
+        if (len == 4) {
+            s->response[0] = (r[0]<<24) | (r[1]<<16) | (r[2]<<8) | r[3];
+        } else if (len == 16) {
+            s->response[0] = (r[11]<<24) | (r[12]<<16) | (r[13]<<8) | r[14];
+            s->response[1] =  (r[7]<<24) |  (r[8]<<16) |  (r[9]<<8) | r[10];
+            s->response[2] =  (r[3]<<24) |  (r[4]<<16) |  (r[5]<<8) |  r[6];
+            s->response[3] =  (0xcc<<24) |  (r[0]<<16) |  (r[1]<<8) |  r[2];
+        }
+        s->int_status |= SDHCI_INT_RESPONSE;
+        if ((cmd & 3) == SDHCI_CMD_RESP_SHORT_BUSY) {
+            /* the command will trigger the busy (DAT[0]) line ON then OFF
+             * this will raise the Data END interrupt when done.
+             */
+            DB_PRINT("raising completion interrupt %08x\n", cmd);
+            s->int_status |= SDHCI_INT_DATA_END;
+        }
+        if (cmd & SDHCI_CMD_DATA) {
+            if (s->transfer_mode & SDHCI_TRNS_DMA) {
+                sdhci_dma_transfer(s);
+            } else {
+                sdhci_pio_transfer(s);
+            }
+        }
+    }
+    sdhci_set_irq(s);
+}
+
+static uint32_t sdhci_read32i(void *opaque, target_phys_addr_t offset)
+{
+    SDHCIState *s = opaque;
+
+    switch (offset) {
+    case SDHCI_DMA_ADDRESS:
+        return s->sdma_address;
+    case SDHCI_BLOCK_SIZE /* +SDHCI_BLOCK_COUNT */:
+        return s->block_size | (s->block_count << 16);
+    case SDHCI_ARGUMENT:
+        return s->arg;
+    case SDHCI_TRANSFER_MODE /* +SDHCI_COMMAND */:
+        return s->transfer_mode;
+    case SDHCI_RESPONSE:
+    case SDHCI_RESPONSE+4:
+    case SDHCI_RESPONSE+8:
+    case SDHCI_RESPONSE+12:
+        return s->response[(offset-SDHCI_RESPONSE)/sizeof(uint32_t)];
+    case SDHCI_BUFFER:
+        return do_pio_read(s);
+    case SDHCI_PRESENT_STATE:
+        return s->present_state | (s->sd ? 0x00170000 : 0) |
+               (s->bs && bdrv_is_read_only(s->bs) ? 0 : 0x00080000);
+    case SDHCI_HOST_CONTROL:
+        /*+SDHCI_POWER_CONTROL +SDHCI_BLOCK_GAP_CONTROL +SDHCI_WAKE_UP_CONTROL*/
+        return s->host_control;
+    case SDHCI_CLOCK_CONTROL /* +SDHCI_TIMEOUT_CONTROL +SDHCI_SOFTWARE_RESET */:
+        return s->clock | (0<<24 /* reset done */);
+    case SDHCI_INT_STATUS:
+        return s->int_status;
+    case SDHCI_INT_ENABLE:
+        return s->int_enable;
+    case SDHCI_SIGNAL_ENABLE:
+        return 0;
+    case SDHCI_ACMD12_ERR:
+        return 0;
+    case SDHCI_CAPABILITIES:
+        return SDHCI_SLOT_TYPE_EMBED | SDHCI_CAN_VDD_330 |
+               SDHCI_CAN_DO_ADMA1 | SDHCI_CAN_DO_HISPD | SDHCI_CAN_DO_SDMA |
+               SDHCI_CAN_DO_8BIT | SDHCI_CAN_DO_ADMA2 |
+               (52 << SDHCI_CLOCK_BASE_SHIFT) |
+               SDHCI_TIMEOUT_CLK_UNIT /* MHz */ | (52<<SDHCI_TIMEOUT_CLK_SHIFT);
+    case SDHCI_CAPABILITIES_1:
+        return 0;
+    case SDHCI_MAX_CURRENT:
+        return 0;
+    case SDHCI_SET_ACMD12_ERROR /* +SDHCI_SET_INT_ERROR */:
+        return 0;
+    case SDHCI_ADMA_ERROR:
+        return s->adma_error;
+    case SDHCI_ADMA_ADDRESS:
+        return s->adma_address;
+    case SDHCI_SLOT_INT_STATUS /* +SDHCI_HOST_VERSION */:
+        return 0 | (SDHCI_SPEC_200 << 16);
+    default:
+        DB_PRINT("Read from out of range offset");
+    }
+
+    return 0;
+}
+
+static uint64_t sdhci_read(void *opaque, target_phys_addr_t offset,
+        unsigned size)
+{
+    uint32_t ret = sdhci_read32i(opaque, offset & ~0x3);
+    ret >>= (offset & 0x3) * 8;
+    ret &= ~(-1ULL << (size * 8));
+    DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", offset, ret);
+    return ret;
+}
+
+static void sdhci_write_masked(void *opaque, target_phys_addr_t offset,
+                               uint32_t value, uint32_t mask)
+{
+    DB_PRINT("addr=" TARGET_FMT_plx " = %x, mask = %08x\n", offset, value,
+        mask);
+    SDHCIState *s = opaque;
+
+    switch (offset) {
+    case SDHCI_DMA_ADDRESS:
+        MASKED_WRITE(s->sdma_address, value, mask);
+        break;
+    case SDHCI_BLOCK_SIZE /* +SDHCI_BLOCK_COUNT */:
+        MASKED_WRITE(s->block_size, value & 0x7fff, mask);
+        MASKED_WRITE(s->block_count, value >> 16, mask >> 16);
+        break;
+    case SDHCI_ARGUMENT:
+        MASKED_WRITE(s->arg, value, mask);
+        break;
+    case SDHCI_TRANSFER_MODE /* +SDHCI_COMMAND */:
+        MASKED_WRITE(s->transfer_mode, value & 0x3f, mask);
+        if (mask & 0xffff0000) {
+            sdhci_command(s, value >> 16);
+        }
+        break;
+    case SDHCI_BUFFER:
+        do_pio_write(s, value);
+        break;
+    case SDHCI_HOST_CONTROL:
+        /*+SDHCI_POWER_CONTROL +SDHCI_BLOCK_GAP_CONTROL +SDHCI_WAKE_UP_CONTROL*/
+        MASKED_WRITE(s->host_control, value, mask);
+        if ((mask >> 8) & SDHCI_POWER_ON) {
+            if (s->sd) {
+                sd_enable(s->sd, ((value & mask) >> 8) & SDHCI_POWER_ON);
+            }
+        }
+        break;
+    case SDHCI_CLOCK_CONTROL /* +SDHCI_TIMEOUT_CONTROL +SDHCI_SOFTWARE_RESET */:
+        if (((value & mask) >> 24) & SDHCI_RESET_ALL) {
+            sdhci_reset(opaque);
+        }
+        if (((value & mask) >> 24) & SDHCI_RESET_CMD) {
+            s->int_status &= ~SDHCI_INT_RESPONSE;
+            sdhci_set_irq(s);
+        }
+        if (((value & mask) >> 24) & SDHCI_RESET_DATA) {
+            s->adma_error = 0;
+            s->int_status &= ~(SDHCI_INT_DATA_END | SDHCI_INT_DMA_END);
+            sdhci_set_irq(s);
+        }
+        MASKED_WRITE(s->clock, (value & 0xfffff) | SDHCI_CLOCK_INT_STABLE,
+                     mask);
+        break;
+    case SDHCI_INT_STATUS:
+        s->int_status &= ~(value & mask);
+        sdhci_set_irq(s);
+        break;
+    case SDHCI_INT_ENABLE:
+        MASKED_WRITE(s->int_enable, value, mask);
+        sdhci_set_irq(s);
+        break;
+    case SDHCI_SIGNAL_ENABLE:
+        break;
+    case SDHCI_SET_ACMD12_ERROR /* +SDHCI_SET_INT_ERROR */:
+        break;
+    case SDHCI_ADMA_ADDRESS:
+        MASKED_WRITE(s->adma_address, value, mask);
+        break;
+    case SDHCI_SLOT_INT_STATUS /* +SDHCI_HOST_VERSION */:
+        break;
+    /* Read only registers */
+    case SDHCI_RESPONSE:
+    case SDHCI_RESPONSE+4:
+    case SDHCI_RESPONSE+8:
+    case SDHCI_RESPONSE+12:
+    case SDHCI_PRESENT_STATE:
+    case SDHCI_ACMD12_ERR:
+    case SDHCI_CAPABILITIES:
+    case SDHCI_CAPABILITIES_1:
+    case SDHCI_MAX_CURRENT:
+    case SDHCI_ADMA_ERROR:
+        DB_PRINT("Ignored write to read only register");
+        break;
+    default:
+        DB_PRINT("Ignored write to out of range offset");
+    }
+}
+
+static void sdhci_write(void *opaque, target_phys_addr_t offset,
+                          uint64_t value, unsigned size)
+{
+    uint32_t mask = (1ULL << (size * 8)) - 1;
+    int shift =  8 * (offset & 0x3);
+    sdhci_write_masked(opaque, offset & ~0x3, value << shift, mask << shift);
+}
+
+static const MemoryRegionOps sdhci_ops = {
+    .read = sdhci_read,
+    .write = sdhci_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static const VMStateDescription sdhci_vmstate = {
+    .name = "sdhci",
+    .version_id = 0,
+    .fields      = (VMStateField[]) {
+        VMSTATE_UINT32(sdma_address, SDHCIState),
+        VMSTATE_UINT16(block_size, SDHCIState),
+        VMSTATE_UINT16(block_count, SDHCIState),
+        VMSTATE_UINT32(arg, SDHCIState),
+        VMSTATE_UINT16(transfer_mode, SDHCIState),
+        VMSTATE_UINT32_ARRAY(response, SDHCIState, 4),
+        VMSTATE_UINT32(clock, SDHCIState),
+        VMSTATE_UINT32(int_enable, SDHCIState),
+        VMSTATE_UINT32(int_status, SDHCIState),
+        VMSTATE_UINT32(adma_address, SDHCIState),
+        VMSTATE_UINT8(adma_error, SDHCIState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static int sdhci_sysbus_init(SysBusDevice *dev)
+{
+    SDHCIState *s = FROM_SYSBUS(SDHCIState, dev);
+
+    if (s->bs) {
+        bdrv_detach_dev(s->bs, s);
+    }
+    sysbus_init_irq(dev, &s->irq);
+    memory_region_init_io(&s->iomem, &sdhci_ops, s, "sdhci", 0x100);
+    sysbus_init_mmio(dev, &s->iomem);
+
+    return 0;
+}
+
+static Property sdhci_properties[] = {
+        DEFINE_PROP_DRIVE("block", SDHCIState, bs),
+        DEFINE_PROP_END_OF_LIST(),
+};
+
+static void sdhci_sysbus_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
+
+    sdc->init = sdhci_sysbus_init;
+    dc->props = sdhci_properties;
+    dc->vmsd = &sdhci_vmstate;
+    dc->reset = sdhci_reset;
+}
+
+static TypeInfo sdhci_sysbus_info = {
+    .name  = "sysbus_sdhci",
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(SDHCIState),
+    .class_init = sdhci_sysbus_class_init,
+};
+
+static void sdhci_register_types(void)
+{
+    type_register_static(&sdhci_sysbus_info);
+}
+
+type_init(sdhci_register_types)