1 /* 2 * ASPEED XDMA Controller 3 * Eddie James <eajames@linux.ibm.com> 4 * 5 * Copyright (C) 2019 IBM Corp 6 * SPDX-License-Identifier: GPL-2.0-or-later 7 */ 8 9 #include "qemu/osdep.h" 10 #include "qemu/log.h" 11 #include "qemu/error-report.h" 12 #include "hw/irq.h" 13 #include "hw/misc/aspeed_xdma.h" 14 #include "migration/vmstate.h" 15 #include "qapi/error.h" 16 17 #include "trace.h" 18 19 #define XDMA_BMC_CMDQ_ADDR 0x10 20 #define XDMA_BMC_CMDQ_ENDP 0x14 21 #define XDMA_BMC_CMDQ_WRP 0x18 22 #define XDMA_BMC_CMDQ_W_MASK 0x0003FFFF 23 #define XDMA_BMC_CMDQ_RDP 0x1C 24 #define XDMA_BMC_CMDQ_RDP_MAGIC 0xEE882266 25 #define XDMA_IRQ_ENG_CTRL 0x20 26 #define XDMA_IRQ_ENG_CTRL_US_COMP BIT(4) 27 #define XDMA_IRQ_ENG_CTRL_DS_COMP BIT(5) 28 #define XDMA_IRQ_ENG_CTRL_W_MASK 0xBFEFF07F 29 #define XDMA_IRQ_ENG_STAT 0x24 30 #define XDMA_IRQ_ENG_STAT_US_COMP BIT(4) 31 #define XDMA_IRQ_ENG_STAT_DS_COMP BIT(5) 32 #define XDMA_IRQ_ENG_STAT_RESET 0xF8000000 33 #define XDMA_MEM_SIZE 0x1000 34 35 #define TO_REG(addr) ((addr) / sizeof(uint32_t)) 36 37 static uint64_t aspeed_xdma_read(void *opaque, hwaddr addr, unsigned int size) 38 { 39 uint32_t val = 0; 40 AspeedXDMAState *xdma = opaque; 41 42 if (addr < ASPEED_XDMA_REG_SIZE) { 43 val = xdma->regs[TO_REG(addr)]; 44 } 45 46 return (uint64_t)val; 47 } 48 49 static void aspeed_xdma_write(void *opaque, hwaddr addr, uint64_t val, 50 unsigned int size) 51 { 52 unsigned int idx; 53 uint32_t val32 = (uint32_t)val; 54 AspeedXDMAState *xdma = opaque; 55 56 if (addr >= ASPEED_XDMA_REG_SIZE) { 57 return; 58 } 59 60 switch (addr) { 61 case XDMA_BMC_CMDQ_ENDP: 62 xdma->regs[TO_REG(addr)] = val32 & XDMA_BMC_CMDQ_W_MASK; 63 break; 64 case XDMA_BMC_CMDQ_WRP: 65 idx = TO_REG(addr); 66 xdma->regs[idx] = val32 & XDMA_BMC_CMDQ_W_MASK; 67 xdma->regs[TO_REG(XDMA_BMC_CMDQ_RDP)] = xdma->regs[idx]; 68 69 trace_aspeed_xdma_write(addr, val); 70 71 if (xdma->bmc_cmdq_readp_set) { 72 xdma->bmc_cmdq_readp_set = 0; 73 } else { 74 xdma->regs[TO_REG(XDMA_IRQ_ENG_STAT)] |= 75 XDMA_IRQ_ENG_STAT_US_COMP | XDMA_IRQ_ENG_STAT_DS_COMP; 76 77 if (xdma->regs[TO_REG(XDMA_IRQ_ENG_CTRL)] & 78 (XDMA_IRQ_ENG_CTRL_US_COMP | XDMA_IRQ_ENG_CTRL_DS_COMP)) 79 qemu_irq_raise(xdma->irq); 80 } 81 break; 82 case XDMA_BMC_CMDQ_RDP: 83 trace_aspeed_xdma_write(addr, val); 84 85 if (val32 == XDMA_BMC_CMDQ_RDP_MAGIC) { 86 xdma->bmc_cmdq_readp_set = 1; 87 } 88 break; 89 case XDMA_IRQ_ENG_CTRL: 90 xdma->regs[TO_REG(addr)] = val32 & XDMA_IRQ_ENG_CTRL_W_MASK; 91 break; 92 case XDMA_IRQ_ENG_STAT: 93 trace_aspeed_xdma_write(addr, val); 94 95 idx = TO_REG(addr); 96 if (val32 & (XDMA_IRQ_ENG_STAT_US_COMP | XDMA_IRQ_ENG_STAT_DS_COMP)) { 97 xdma->regs[idx] &= 98 ~(XDMA_IRQ_ENG_STAT_US_COMP | XDMA_IRQ_ENG_STAT_DS_COMP); 99 qemu_irq_lower(xdma->irq); 100 } 101 break; 102 default: 103 xdma->regs[TO_REG(addr)] = val32; 104 break; 105 } 106 } 107 108 static const MemoryRegionOps aspeed_xdma_ops = { 109 .read = aspeed_xdma_read, 110 .write = aspeed_xdma_write, 111 .endianness = DEVICE_NATIVE_ENDIAN, 112 .valid.min_access_size = 4, 113 .valid.max_access_size = 4, 114 }; 115 116 static void aspeed_xdma_realize(DeviceState *dev, Error **errp) 117 { 118 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 119 AspeedXDMAState *xdma = ASPEED_XDMA(dev); 120 121 sysbus_init_irq(sbd, &xdma->irq); 122 memory_region_init_io(&xdma->iomem, OBJECT(xdma), &aspeed_xdma_ops, xdma, 123 TYPE_ASPEED_XDMA, XDMA_MEM_SIZE); 124 sysbus_init_mmio(sbd, &xdma->iomem); 125 } 126 127 static void aspeed_xdma_reset(DeviceState *dev) 128 { 129 AspeedXDMAState *xdma = ASPEED_XDMA(dev); 130 131 xdma->bmc_cmdq_readp_set = 0; 132 memset(xdma->regs, 0, ASPEED_XDMA_REG_SIZE); 133 xdma->regs[TO_REG(XDMA_IRQ_ENG_STAT)] = XDMA_IRQ_ENG_STAT_RESET; 134 135 qemu_irq_lower(xdma->irq); 136 } 137 138 static const VMStateDescription aspeed_xdma_vmstate = { 139 .name = TYPE_ASPEED_XDMA, 140 .version_id = 1, 141 .fields = (VMStateField[]) { 142 VMSTATE_UINT32_ARRAY(regs, AspeedXDMAState, ASPEED_XDMA_NUM_REGS), 143 VMSTATE_END_OF_LIST(), 144 }, 145 }; 146 147 static void aspeed_xdma_class_init(ObjectClass *classp, void *data) 148 { 149 DeviceClass *dc = DEVICE_CLASS(classp); 150 151 dc->realize = aspeed_xdma_realize; 152 dc->reset = aspeed_xdma_reset; 153 dc->vmsd = &aspeed_xdma_vmstate; 154 } 155 156 static const TypeInfo aspeed_xdma_info = { 157 .name = TYPE_ASPEED_XDMA, 158 .parent = TYPE_SYS_BUS_DEVICE, 159 .instance_size = sizeof(AspeedXDMAState), 160 .class_init = aspeed_xdma_class_init, 161 }; 162 163 static void aspeed_xdma_register_type(void) 164 { 165 type_register_static(&aspeed_xdma_info); 166 } 167 type_init(aspeed_xdma_register_type); 168