hw/misc/aspeed_xdma: Add AST2600 support

When we introduced support for the AST2600 SoC, the XDMA controller
was forgotten. It went unnoticed because it's not used under emulation.
But the register layout being different, the reset procedure is bogus
and this breaks kexec.

Add a AspeedXDMAClass to take into account the register differences.

Cc: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Eddie James <eajames@linux.ibm.com>
Message-Id: <20210407171637.777743-14-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

hw/arm/aspeed_ast2600.c

@@ -187,7 +187,8 @@ static void aspeed_soc_ast2600_init(Object *obj)
         object_initialize_child(obj, "mii[*]", &s->mii[i], TYPE_ASPEED_MII);
     }
 
-    object_initialize_child(obj, "xdma", &s->xdma, TYPE_ASPEED_XDMA);
+    snprintf(typename, sizeof(typename), TYPE_ASPEED_XDMA "-%s", socname);
+    object_initialize_child(obj, "xdma", &s->xdma, typename);
 
     snprintf(typename, sizeof(typename), "aspeed.gpio-%s", socname);
     object_initialize_child(obj, "gpio", &s->gpio, typename);

hw/arm/aspeed_soc.c

@@ -199,7 +199,8 @@ static void aspeed_soc_init(Object *obj)
                                 TYPE_FTGMAC100);
     }
 
-    object_initialize_child(obj, "xdma", &s->xdma, TYPE_ASPEED_XDMA);
+    snprintf(typename, sizeof(typename), TYPE_ASPEED_XDMA "-%s", socname);
+    object_initialize_child(obj, "xdma", &s->xdma, typename);
 
     snprintf(typename, sizeof(typename), "aspeed.gpio-%s", socname);
     object_initialize_child(obj, "gpio", &s->gpio, typename);

hw/misc/aspeed_xdma.c

@@ -30,6 +30,19 @@
 #define  XDMA_IRQ_ENG_STAT_US_COMP BIT(4)
 #define  XDMA_IRQ_ENG_STAT_DS_COMP BIT(5)
 #define  XDMA_IRQ_ENG_STAT_RESET   0xF8000000
+
+#define XDMA_AST2600_BMC_CMDQ_ADDR   0x14
+#define XDMA_AST2600_BMC_CMDQ_ENDP   0x18
+#define XDMA_AST2600_BMC_CMDQ_WRP    0x1c
+#define XDMA_AST2600_BMC_CMDQ_RDP    0x20
+#define XDMA_AST2600_IRQ_CTRL        0x38
+#define  XDMA_AST2600_IRQ_CTRL_US_COMP    BIT(16)
+#define  XDMA_AST2600_IRQ_CTRL_DS_COMP    BIT(17)
+#define  XDMA_AST2600_IRQ_CTRL_W_MASK     0x017003FF
+#define XDMA_AST2600_IRQ_STATUS      0x3c
+#define  XDMA_AST2600_IRQ_STATUS_US_COMP  BIT(16)
+#define  XDMA_AST2600_IRQ_STATUS_DS_COMP  BIT(17)
+
 #define XDMA_MEM_SIZE              0x1000
 
 #define TO_REG(addr) ((addr) / sizeof(uint32_t))
@@ -52,56 +65,48 @@ static void aspeed_xdma_write(void *opaque, hwaddr addr, uint64_t val,
     unsigned int idx;
     uint32_t val32 = (uint32_t)val;
     AspeedXDMAState *xdma = opaque;
+    AspeedXDMAClass *axc = ASPEED_XDMA_GET_CLASS(xdma);
 
     if (addr >= ASPEED_XDMA_REG_SIZE) {
         return;
     }
 
-    switch (addr) {
-    case XDMA_BMC_CMDQ_ENDP:
+    if (addr == axc->cmdq_endp) {
         xdma->regs[TO_REG(addr)] = val32 & XDMA_BMC_CMDQ_W_MASK;
-        break;
-    case XDMA_BMC_CMDQ_WRP:
+    } else if (addr == axc->cmdq_wrp) {
         idx = TO_REG(addr);
         xdma->regs[idx] = val32 & XDMA_BMC_CMDQ_W_MASK;
-        xdma->regs[TO_REG(XDMA_BMC_CMDQ_RDP)] = xdma->regs[idx];
+        xdma->regs[TO_REG(axc->cmdq_rdp)] = xdma->regs[idx];
 
         trace_aspeed_xdma_write(addr, val);
 
         if (xdma->bmc_cmdq_readp_set) {
             xdma->bmc_cmdq_readp_set = 0;
         } else {
-            xdma->regs[TO_REG(XDMA_IRQ_ENG_STAT)] |=
-                XDMA_IRQ_ENG_STAT_US_COMP | XDMA_IRQ_ENG_STAT_DS_COMP;
+            xdma->regs[TO_REG(axc->intr_status)] |= axc->intr_complete;
 
-            if (xdma->regs[TO_REG(XDMA_IRQ_ENG_CTRL)] &
-                (XDMA_IRQ_ENG_CTRL_US_COMP | XDMA_IRQ_ENG_CTRL_DS_COMP))
+            if (xdma->regs[TO_REG(axc->intr_ctrl)] & axc->intr_complete) {
                 qemu_irq_raise(xdma->irq);
+            }
         }
-        break;
-    case XDMA_BMC_CMDQ_RDP:
+    } else if (addr == axc->cmdq_rdp) {
         trace_aspeed_xdma_write(addr, val);
 
         if (val32 == XDMA_BMC_CMDQ_RDP_MAGIC) {
             xdma->bmc_cmdq_readp_set = 1;
         }
-        break;
-    case XDMA_IRQ_ENG_CTRL:
-        xdma->regs[TO_REG(addr)] = val32 & XDMA_IRQ_ENG_CTRL_W_MASK;
-        break;
-    case XDMA_IRQ_ENG_STAT:
+    } else if (addr == axc->intr_ctrl) {
+        xdma->regs[TO_REG(addr)] = val32 & axc->intr_ctrl_mask;
+    } else if (addr == axc->intr_status) {
         trace_aspeed_xdma_write(addr, val);
 
         idx = TO_REG(addr);
-        if (val32 & (XDMA_IRQ_ENG_STAT_US_COMP | XDMA_IRQ_ENG_STAT_DS_COMP)) {
-            xdma->regs[idx] &=
-                ~(XDMA_IRQ_ENG_STAT_US_COMP | XDMA_IRQ_ENG_STAT_DS_COMP);
+        if (val32 & axc->intr_complete) {
+            xdma->regs[idx] &= ~axc->intr_complete;
             qemu_irq_lower(xdma->irq);
         }
-        break;
-    default:
+    } else {
         xdma->regs[TO_REG(addr)] = val32;
-        break;
     }
 }
 
@@ -127,10 +132,11 @@ static void aspeed_xdma_realize(DeviceState *dev, Error **errp)
 static void aspeed_xdma_reset(DeviceState *dev)
 {
     AspeedXDMAState *xdma = ASPEED_XDMA(dev);
+    AspeedXDMAClass *axc = ASPEED_XDMA_GET_CLASS(xdma);
 
     xdma->bmc_cmdq_readp_set = 0;
     memset(xdma->regs, 0, ASPEED_XDMA_REG_SIZE);
-    xdma->regs[TO_REG(XDMA_IRQ_ENG_STAT)] = XDMA_IRQ_ENG_STAT_RESET;
+    xdma->regs[TO_REG(axc->intr_status)] = XDMA_IRQ_ENG_STAT_RESET;
 
     qemu_irq_lower(xdma->irq);
 }
@@ -144,6 +150,73 @@ static const VMStateDescription aspeed_xdma_vmstate = {
     },
 };
 
+static void aspeed_2600_xdma_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    AspeedXDMAClass *axc = ASPEED_XDMA_CLASS(klass);
+
+    dc->desc = "ASPEED 2600 XDMA Controller";
+
+    axc->cmdq_endp = XDMA_AST2600_BMC_CMDQ_ENDP;
+    axc->cmdq_wrp = XDMA_AST2600_BMC_CMDQ_WRP;
+    axc->cmdq_rdp = XDMA_AST2600_BMC_CMDQ_RDP;
+    axc->intr_ctrl = XDMA_AST2600_IRQ_CTRL;
+    axc->intr_ctrl_mask = XDMA_AST2600_IRQ_CTRL_W_MASK;
+    axc->intr_status = XDMA_AST2600_IRQ_STATUS;
+    axc->intr_complete = XDMA_AST2600_IRQ_STATUS_US_COMP |
+        XDMA_AST2600_IRQ_STATUS_DS_COMP;
+}
+
+static const TypeInfo aspeed_2600_xdma_info = {
+    .name = TYPE_ASPEED_2600_XDMA,
+    .parent = TYPE_ASPEED_XDMA,
+    .class_init = aspeed_2600_xdma_class_init,
+};
+
+static void aspeed_2500_xdma_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    AspeedXDMAClass *axc = ASPEED_XDMA_CLASS(klass);
+
+    dc->desc = "ASPEED 2500 XDMA Controller";
+
+    axc->cmdq_endp = XDMA_BMC_CMDQ_ENDP;
+    axc->cmdq_wrp = XDMA_BMC_CMDQ_WRP;
+    axc->cmdq_rdp = XDMA_BMC_CMDQ_RDP;
+    axc->intr_ctrl = XDMA_IRQ_ENG_CTRL;
+    axc->intr_ctrl_mask = XDMA_IRQ_ENG_CTRL_W_MASK;
+    axc->intr_status = XDMA_IRQ_ENG_STAT;
+    axc->intr_complete = XDMA_IRQ_ENG_STAT_US_COMP | XDMA_IRQ_ENG_STAT_DS_COMP;
+};
+
+static const TypeInfo aspeed_2500_xdma_info = {
+    .name = TYPE_ASPEED_2500_XDMA,
+    .parent = TYPE_ASPEED_XDMA,
+    .class_init = aspeed_2500_xdma_class_init,
+};
+
+static void aspeed_2400_xdma_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    AspeedXDMAClass *axc = ASPEED_XDMA_CLASS(klass);
+
+    dc->desc = "ASPEED 2400 XDMA Controller";
+
+    axc->cmdq_endp = XDMA_BMC_CMDQ_ENDP;
+    axc->cmdq_wrp = XDMA_BMC_CMDQ_WRP;
+    axc->cmdq_rdp = XDMA_BMC_CMDQ_RDP;
+    axc->intr_ctrl = XDMA_IRQ_ENG_CTRL;
+    axc->intr_ctrl_mask = XDMA_IRQ_ENG_CTRL_W_MASK;
+    axc->intr_status = XDMA_IRQ_ENG_STAT;
+    axc->intr_complete = XDMA_IRQ_ENG_STAT_US_COMP | XDMA_IRQ_ENG_STAT_DS_COMP;
+};
+
+static const TypeInfo aspeed_2400_xdma_info = {
+    .name = TYPE_ASPEED_2400_XDMA,
+    .parent = TYPE_ASPEED_XDMA,
+    .class_init = aspeed_2400_xdma_class_init,
+};
+
 static void aspeed_xdma_class_init(ObjectClass *classp, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(classp);
@@ -158,10 +231,15 @@ static const TypeInfo aspeed_xdma_info = {
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(AspeedXDMAState),
     .class_init    = aspeed_xdma_class_init,
+    .class_size    = sizeof(AspeedXDMAClass),
+    .abstract      = true,
 };
 
 static void aspeed_xdma_register_type(void)
 {
     type_register_static(&aspeed_xdma_info);
+    type_register_static(&aspeed_2400_xdma_info);
+    type_register_static(&aspeed_2500_xdma_info);
+    type_register_static(&aspeed_2600_xdma_info);
 }
 type_init(aspeed_xdma_register_type);

include/hw/misc/aspeed_xdma.h

@@ -13,7 +13,10 @@
 #include "qom/object.h"
 
 #define TYPE_ASPEED_XDMA "aspeed.xdma"
-OBJECT_DECLARE_SIMPLE_TYPE(AspeedXDMAState, ASPEED_XDMA)
+#define TYPE_ASPEED_2400_XDMA TYPE_ASPEED_XDMA "-ast2400"
+#define TYPE_ASPEED_2500_XDMA TYPE_ASPEED_XDMA "-ast2500"
+#define TYPE_ASPEED_2600_XDMA TYPE_ASPEED_XDMA "-ast2600"
+OBJECT_DECLARE_TYPE(AspeedXDMAState, AspeedXDMAClass, ASPEED_XDMA)
 
 #define ASPEED_XDMA_NUM_REGS (ASPEED_XDMA_REG_SIZE / sizeof(uint32_t))
 #define ASPEED_XDMA_REG_SIZE 0x7C
@@ -28,4 +31,16 @@ struct AspeedXDMAState {
     uint32_t regs[ASPEED_XDMA_NUM_REGS];
 };
 
+struct AspeedXDMAClass {
+    SysBusDeviceClass parent_class;
+
+    uint8_t cmdq_endp;
+    uint8_t cmdq_wrp;
+    uint8_t cmdq_rdp;
+    uint8_t intr_ctrl;
+    uint32_t intr_ctrl_mask;
+    uint8_t intr_status;
+    uint32_t intr_complete;
+};
+
 #endif /* ASPEED_XDMA_H */