[PATCH v6 21/29] hw/arm/aspeed_ast27x0: Support two levels of INTC controllers for AST2700 A1

[Jamin Lin via <qemu-devel@nongnu.org>]

The design of INTC controllers has significantly changed in AST2700 A1.

There are a total of 480 interrupt sources in AST2700 A1. For interrupt numbers
from 0 to 127, they can route directly to PSP, SSP, and TSP. Due to the
limitation of interrupt numbers of processors, the interrupts are merged every
32 sources for interrupt numbers greater than 127.

There are two levels of interrupt controllers, INTC(CPUD Die) and INTCIO
(IO Die). The interrupt sources of INTC are the interrupt numbers from INTC_0 to
INTC_127 and interrupts from INTCIO. The interrupt sources of INTCIO are the
interrupt numbers greater than INTC_127. INTC_IO controls the interrupts
INTC_128 to INTC_319 only.

Currently, only GIC 192 to 201 are supported, and their source interrupts are
from INTCIO and connected to INTC at input pin 0 and output pins 0 to 9 for
GIC 192-201.

The design of the orgates for GICINT 196 is as follows:
It has interrupt sources ranging from 0 to 31, with its output pin connected to
INTCIO "T0 GICINT_196". The output pin is then connected to INTC "GIC_192_201"
at bit 4, and its bit 4 output should be connected to GIC 196.
The design of INTC GIC_192_201 have 10 output pins, mapped as following:
Bit 0 -> GIC 192
Bit 1 -> GIC 193
Bit 2 -> GIC 194
Bit 3 -> GIC 195
Bit 4 -> GIC 196

To support both AST2700 A1 and A0, INTC input pins 1 to 9 and output pins
10 to 18 remain to support GIC 128-136, which source interrupts from INTC.
These will be removed if we decide not to support AST2700 A0 in the future.

|-------------------------------------------------------------------------------------------------------|
|                                                   AST2700 A1 Design                                   |
|           To GICINT196                                                                                |
|                                                                                                       |
|   ETH1    |-----------|                    |--------------------------|        |--------------|       |
|  -------->|0          |                    |         INTCIO           |        |  orgates[0]  |       |
|   ETH2    |          4|   orgates[0]------>|inpin[0]-------->outpin[0]|------->| 0            |       |
|  -------->|1         5|   orgates[1]------>|inpin[1]-------->outpin[1]|------->| 1            |       |
|   ETH3    |          6|   orgates[2]------>|inpin[2]-------->outpin[2]|------->| 2            |       |
|  -------->|2        19|   orgates[3]------>|inpin[3]-------->outpin[3]|------->| 3  OR[0:9]   |-----| |
|   UART0   |         20|-->orgates[4]------>|inpin[4]-------->outpin[4]|------->| 4            |     | |
|  -------->|7        21|   orgates[5]------>|inpin[5]-------->outpin[5]|------->| 5            |     | |
|   UART1   |         22|   orgates[6]------>|inpin[6]-------->outpin[6]|------->| 6            |     | |
|  -------->|8        23|   orgates[7]------>|inpin[7]-------->outpin[7]|------->| 7            |     | |
|   UART2   |         24|   orgates[8]------>|inpin[8]-------->outpin[8]|------->| 8            |     | |
|  -------->|9        25|   orgates[9]------>|inpin[9]-------->outpin[9]|------->| 9            |     | |
|   UART3   |         26|                    |--------------------------|        |--------------|     | |
|  ---------|10       27|                                                                             | |
|   UART5   |         28|                                                                             | |
|  -------->|11       29|                                                                             | |
|   UART6   |           |                                                                             | |
|  -------->|12       30|     |-----------------------------------------------------------------------| |
|   UART7   |         31|     |                                                                         |
|  -------->|13         |     |                                                                         |
|   UART8   |  OR[0:31] |     |                |------------------------------|           |----------|  |
|  -------->|14         |     |                |            INTC              |           |     GIC  |  |
|   UART9   |           |     |                |inpin[0:0]--------->outpin[0] |---------->|192       |  |
|  -------->|15         |     |                |inpin[0:1]--------->outpin[1] |---------->|193       |  |
|   UART10  |           |     |                |inpin[0:2]--------->outpin[2] |---------->|194       |  |
|  -------->|16         |     |                |inpin[0:3]--------->outpin[3] |---------->|195       |  |
|   UART11  |           |     |--------------> |inpin[0:4]--------->outpin[4] |---------->|196       |  |
|  -------->|17         |                      |inpin[0:5]--------->outpin[5] |---------->|197       |  |
|   UART12  |           |                      |inpin[0:6]--------->outpin[6] |---------->|198       |  |
|  -------->|18         |                      |inpin[0:7]--------->outpin[7] |---------->|199       |  |
|           |-----------|                      |inpin[0:8]--------->outpin[8] |---------->|200       |  |
|                                              |inpin[0:9]--------->outpin[9] |---------->|201       |  |
|-------------------------------------------------------------------------------------------------------|
|-------------------------------------------------------------------------------------------------------|
|  ETH1    |-----------|     orgates[1]------->|inpin[1]----------->outpin[10]|---------->|128       |  |
| -------->|0          |     orgates[2]------->|inpin[2]----------->outpin[11]|---------->|129       |  |
|  ETH2    |          4|     orgates[3]------->|inpin[3]----------->outpin[12]|---------->|130       |  |
| -------->|1         5|     orgates[4]------->|inpin[4]----------->outpin[13]|---------->|131       |  |
|  ETH3    |          6|---->orgates[5]------->|inpin[5]----------->outpin[14]|---------->|132       |  |
| -------->|2        19|     orgates[6]------->|inpin[6]----------->outpin[15]|---------->|133       |  |
|  UART0   |         20|     orgates[7]------->|inpin[7]----------->outpin[16]|---------->|134       |  |
| -------->|7        21|     orgates[8]------->|inpin[8]----------->outpin[17]|---------->|135       |  |
|  UART1   |         22|     orgates[9]------->|inpin[9]----------->outpin[18]|---------->|136       |  |
| -------->|8        23|                       |------------------------------|           |----------|  |
|  UART2   |         24|                                                                                |
| -------->|9        25|                       AST2700 A0 Design                                        |
|  UART3   |         26|                                                                                |
| -------->|10       27|                                                                                |
|  UART5   |         28|                                                                                |
| -------->|11       29| GICINT132                                                                      |
|  UART6   |           |                                                                                |
| -------->|12       30|                                                                                |
|  UART7   |         31|                                                                                |
| -------->|13         |                                                                                |
|  UART8   |  OR[0:31] |                                                                                |
| -------->|14         |                                                                                |
|  UART9   |           |                                                                                |
| -------->|15         |                                                                                |
|  UART10  |           |                                                                                |
| -------->|16         |                                                                                |
|  UART11  |           |                                                                                |
| -------->|17         |                                                                                |
|  UART12  |           |                                                                                |
| -------->|18         |                                                                                |
|          |-----------|                                                                                |
|                                                                                                       |
|-------------------------------------------------------------------------------------------------------|

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
---
 include/hw/arm/aspeed_soc.h |  1 +
 hw/arm/aspeed_ast27x0.c     | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/hw/arm/aspeed_soc.h b/include/hw/arm/aspeed_soc.h
index 1ac99269ae..62f75c33dc 100644
--- a/include/hw/arm/aspeed_soc.h
+++ b/include/hw/arm/aspeed_soc.h
@@ -195,6 +195,7 @@ enum {
     ASPEED_DEV_EHCI2,
     ASPEED_DEV_VIC,
     ASPEED_DEV_INTC,
+    ASPEED_DEV_INTCIO,
     ASPEED_DEV_SDMC,
     ASPEED_DEV_SCU,
     ASPEED_DEV_ADC,
diff --git a/hw/arm/aspeed_ast27x0.c b/hw/arm/aspeed_ast27x0.c
index 90545215e2..cd37d2b4ba 100644
--- a/hw/arm/aspeed_ast27x0.c
+++ b/hw/arm/aspeed_ast27x0.c
@@ -57,6 +57,7 @@ static const hwaddr aspeed_soc_ast2700_memmap[] = {
     [ASPEED_DEV_ETH3]      =  0x14070000,
     [ASPEED_DEV_EMMC]      =  0x12090000,
     [ASPEED_DEV_INTC]      =  0x12100000,
+    [ASPEED_DEV_INTCIO]    =  0x14C18000,
     [ASPEED_DEV_SLI]       =  0x12C17000,
     [ASPEED_DEV_SLIIO]     =  0x14C1E000,
     [ASPEED_GIC_DIST]      =  0x12200000,
@@ -411,6 +412,8 @@ static void aspeed_soc_ast2700_init(Object *obj)
     object_initialize_child(obj, "sli", &s->sli, TYPE_ASPEED_2700_SLI);
     object_initialize_child(obj, "sliio", &s->sliio, TYPE_ASPEED_2700_SLIIO);
     object_initialize_child(obj, "intc", &a->intc[0], TYPE_ASPEED_2700_INTC);
+    object_initialize_child(obj, "intcio", &a->intc[1],
+                            TYPE_ASPEED_2700_INTCIO);
 
     snprintf(typename, sizeof(typename), "aspeed.adc-%s", socname);
     object_initialize_child(obj, "adc", &s->adc, typename);
@@ -523,6 +526,7 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
     AspeedSoCState *s = ASPEED_SOC(dev);
     AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
     AspeedINTCClass *ic = ASPEED_INTC_GET_CLASS(&a->intc[0]);
+    AspeedINTCClass *icio = ASPEED_INTC_GET_CLASS(&a->intc[1]);
     g_autofree char *sram_name = NULL;
     qemu_irq irq;
 
@@ -560,6 +564,14 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
     aspeed_mmio_map(s, SYS_BUS_DEVICE(&a->intc[0]), 0,
                     sc->memmap[ASPEED_DEV_INTC]);
 
+    /* INTCIO */
+    if (!sysbus_realize(SYS_BUS_DEVICE(&a->intc[1]), errp)) {
+        return;
+    }
+
+    aspeed_mmio_map(s, SYS_BUS_DEVICE(&a->intc[1]), 0,
+                    sc->memmap[ASPEED_DEV_INTCIO]);
+
     /* irq sources -> orgates -> INTC */
     for (i = 0; i < ic->num_inpins; i++) {
         qdev_connect_gpio_out(DEVICE(&a->intc[0].orgates[i]), 0,
@@ -574,6 +586,18 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
                                             ast2700_gic_intcmap[i].irq));
     }
 
+    /* irq source -> orgates -> INTCIO */
+    for (i = 0; i < icio->num_inpins; i++) {
+        qdev_connect_gpio_out(DEVICE(&a->intc[1].orgates[i]), 0,
+                              qdev_get_gpio_in(DEVICE(&a->intc[1]), i));
+    }
+
+    /* INTCIO -> INTC */
+    for (i = 0; i < icio->num_outpins; i++) {
+        sysbus_connect_irq(SYS_BUS_DEVICE(&a->intc[1]), i,
+                           qdev_get_gpio_in(DEVICE(&a->intc[0].orgates[0]), i));
+    }
+
     /* SRAM */
     sram_name = g_strdup_printf("aspeed.sram.%d", CPU(&a->cpu[0])->cpu_index);
     if (!memory_region_init_ram(&s->sram, OBJECT(s), sram_name, sc->sram_size,
-- 
2.43.0