LXR qemu/hw/misc/imx7

   1/*
   2 * Copyright (c) 2018, Impinj, Inc.
   3 *
   4 * i.MX7 GPR IP block emulation code
   5 *
   6 * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
   7 *
   8 * This work is licensed under the terms of the GNU GPL, version 2 or later.
   9 * See the COPYING file in the top-level directory.
  10 *
  11 * Bare minimum emulation code needed to support being able to shut
  12 * down linux guest gracefully.
  13 */
  14
  15#include "qemu/osdep.h"
  16#include "hw/misc/imx7_gpr.h"
  17#include "qemu/log.h"
  18#include "sysemu/sysemu.h"
  19
  20#include "trace.h"
  21
  22enum IMX7GPRRegisters {
  23    IOMUXC_GPR0  = 0x00,
  24    IOMUXC_GPR1  = 0x04,
  25    IOMUXC_GPR2  = 0x08,
  26    IOMUXC_GPR3  = 0x0c,
  27    IOMUXC_GPR4  = 0x10,
  28    IOMUXC_GPR5  = 0x14,
  29    IOMUXC_GPR6  = 0x18,
  30    IOMUXC_GPR7  = 0x1c,
  31    IOMUXC_GPR8  = 0x20,
  32    IOMUXC_GPR9  = 0x24,
  33    IOMUXC_GPR10 = 0x28,
  34    IOMUXC_GPR11 = 0x2c,
  35    IOMUXC_GPR12 = 0x30,
  36    IOMUXC_GPR13 = 0x34,
  37    IOMUXC_GPR14 = 0x38,
  38    IOMUXC_GPR15 = 0x3c,
  39    IOMUXC_GPR16 = 0x40,
  40    IOMUXC_GPR17 = 0x44,
  41    IOMUXC_GPR18 = 0x48,
  42    IOMUXC_GPR19 = 0x4c,
  43    IOMUXC_GPR20 = 0x50,
  44    IOMUXC_GPR21 = 0x54,
  45    IOMUXC_GPR22 = 0x58,
  46};
  47
  48#define IMX7D_GPR1_IRQ_MASK                 BIT(12)
  49#define IMX7D_GPR1_ENET1_TX_CLK_SEL_MASK    BIT(13)
  50#define IMX7D_GPR1_ENET2_TX_CLK_SEL_MASK    BIT(14)
  51#define IMX7D_GPR1_ENET_TX_CLK_SEL_MASK     (0x3 << 13)
  52#define IMX7D_GPR1_ENET1_CLK_DIR_MASK       BIT(17)
  53#define IMX7D_GPR1_ENET2_CLK_DIR_MASK       BIT(18)
  54#define IMX7D_GPR1_ENET_CLK_DIR_MASK        (0x3 << 17)
  55
  56#define IMX7D_GPR5_CSI_MUX_CONTROL_MIPI     BIT(4)
  57#define IMX7D_GPR12_PCIE_PHY_REFCLK_SEL     BIT(5)
  58#define IMX7D_GPR22_PCIE_PHY_PLL_LOCKED     BIT(31)
  59
  60
  61static uint64_t imx7_gpr_read(void *opaque, hwaddr offset, unsigned size)
  62{
  63    trace_imx7_gpr_read(offset);
  64
  65    if (offset == IOMUXC_GPR22) {
  66        return IMX7D_GPR22_PCIE_PHY_PLL_LOCKED;
  67    }
  68
  69    return 0;
  70}
  71
  72static void imx7_gpr_write(void *opaque, hwaddr offset,
  73                           uint64_t v, unsigned size)
  74{
  75    trace_imx7_gpr_write(offset, v);
  76}
  77
  78static const struct MemoryRegionOps imx7_gpr_ops = {
  79    .read = imx7_gpr_read,
  80    .write = imx7_gpr_write,
  81    .endianness = DEVICE_NATIVE_ENDIAN,
  82    .impl = {
  83        /*
  84         * Our device would not work correctly if the guest was doing
  85         * unaligned access. This might not be a limitation on the
  86         * real device but in practice there is no reason for a guest
  87         * to access this device unaligned.
  88         */
  89        .min_access_size = 4,
  90        .max_access_size = 4,
  91        .unaligned = false,
  92    },
  93};
  94
  95static void imx7_gpr_init(Object *obj)
  96{
  97    SysBusDevice *sd = SYS_BUS_DEVICE(obj);
  98    IMX7GPRState *s = IMX7_GPR(obj);
  99
 100    memory_region_init_io(&s->mmio, obj, &imx7_gpr_ops, s,
 101                          TYPE_IMX7_GPR, 64 * 1024);
 102    sysbus_init_mmio(sd, &s->mmio);
 103}
 104
 105static void imx7_gpr_class_init(ObjectClass *klass, void *data)
 106{
 107    DeviceClass *dc = DEVICE_CLASS(klass);
 108
 109    dc->desc  = "i.MX7 General Purpose Registers Module";
 110}
 111
 112static const TypeInfo imx7_gpr_info = {
 113    .name          = TYPE_IMX7_GPR,
 114    .parent        = TYPE_SYS_BUS_DEVICE,
 115    .instance_size = sizeof(IMX7GPRState),
 116    .instance_init = imx7_gpr_init,
 117    .class_init    = imx7_gpr_class_init,
 118};
 119
 120static void imx7_gpr_register_type(void)
 121{
 122    type_register_static(&imx7_gpr_info);
 123}
 124type_init(imx7_gpr_register_type)
 125