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 "qemu/module.h" 19 20 #include "trace.h" 21 22 enum 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 61 static 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 72 static void imx7_gpr_write(void *opaque, hwaddr offset, 73 uint64_t v, unsigned size) 74 { 75 trace_imx7_gpr_write(offset, v); 76 } 77 78 static 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 95 static 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 } 104 105 static 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 } 111 112 static 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 }; 119 120 static void imx7_gpr_register_type(void) 121 { 122 type_register_static(&imx7_gpr_info); 123 } 124 type_init(imx7_gpr_register_type) 125