[Qemu-devel] [PATCH v2 4/8] hw/acpi/aml-build: Add GPIO Connection Descriptor

[Shannon Zhao <shannon.zhao@linaro.org>]

Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
 hw/acpi/aml-build.c         | 61 +++++++++++++++++++++++++++++++++++++++++++++
 include/hw/acpi/aml-build.h | 20 +++++++++++++++
 2 files changed, 81 insertions(+)

diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 0d4b324..250941f 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -565,6 +565,67 @@ Aml *aml_call4(const char *method, Aml *arg1, Aml *arg2, Aml *arg3, Aml *arg4)
 }
 
 /*
+ * ACPI 5.0: 6.4.3.8.1 GPIO Connection Descriptor
+ * Type 1, Large Item Name 0xC
+ */
+
+static Aml *aml_gpio_connection(AmlGpioConnectionType type,
+                                AmlConsumerAndProducer con_and_pro,
+                                uint8_t flags, AmlPinConfig pin_cfg,
+                                int16_t output_drive, int16_t debounce_timeout,
+                                int32_t pin_num[], int32_t pin_count,
+                                const char *name, const char *vendor_data)
+{
+    Aml *var = aml_alloc();
+    uint16_t name_len = name ? (strlen(name) + 1) : 0;
+    uint16_t vendor_data_len = vendor_data ? (strlen(vendor_data) + 1) : 0;
+    uint16_t length = 0x16 + name_len + vendor_data_len;
+    uint16_t name_offset = 0x17 + pin_count * 2;
+    uint16_t vendor_data_offset = name_offset + name_len;
+    int i;
+
+    build_append_byte(var->buf, 0x8C);  /* GpioInt Resource Descriptor */
+    build_append_int_noprefix(var->buf, length, 2); /* Length */
+    build_append_byte(var->buf, 1);     /* Revision ID */
+    build_append_byte(var->buf, type);  /* GPIO Connection Type */
+    /* General Flags (2 bytes) */
+    build_append_int_noprefix(var->buf, con_and_pro, 2);
+    /* Interrupt and IO Flags (2 bytes) */
+    build_append_int_noprefix(var->buf, flags, 2);
+    /* Pin Configuration 0 = Default 1 = Pull-up 2 = Pull-down 3 = No Pull */
+    build_append_byte(var->buf, pin_cfg);
+    /* Output Drive Strength (2 bytes) */
+    build_append_int_noprefix(var->buf, output_drive, 2);
+    /* Debounce Timeout (2 bytes) */
+    build_append_int_noprefix(var->buf, debounce_timeout, 2);
+    /* Pin Table Offset (2 bytes) */
+    build_append_int_noprefix(var->buf, 0x17, 2);
+    build_append_byte(var->buf, 0);     /* Resource Source Index */
+    /* Resource Source Name Offset (2 bytes) */
+    build_append_int_noprefix(var->buf, name_offset, 2);
+    /* Vendor Data Offset (2 bytes) */
+    build_append_int_noprefix(var->buf, vendor_data_offset, 2);
+    /* Vendor Data Length (2 bytes) */
+    build_append_int_noprefix(var->buf, vendor_data_len, 2);
+    /* Pin Number (2n bytes)*/
+    for (i = 0; i < pin_count; i++) {
+        build_append_int_noprefix(var->buf, pin_num[i], 2);
+    }
+    /* Resource Source Name */
+    if (name != NULL) {
+        build_append_namestring(var->buf, "%s", name);
+        build_append_byte(var->buf, '\0');
+    }
+    /* Vendor-defined Data */
+    if (vendor_data != NULL) {
+        build_append_namestring(var->buf, "%s", vendor_data);
+        build_append_byte(var->buf, '\0');
+    }
+
+    return var;
+}
+
+/*
  * ACPI 1.0b: 6.4.3.4 32-Bit Fixed Location Memory Range Descriptor
  * (Type 1, Large Item Name 0x6)
  */
diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
index 1b632dc..4e88882 100644
--- a/include/hw/acpi/aml-build.h
+++ b/include/hw/acpi/aml-build.h
@@ -148,6 +148,26 @@ typedef enum {
     AML_SHARED_AND_WAKE = 3,
 } AmlShared;
 
+/*
+ * ACPI 5.0: Table 6-189 GPIO Connection Descriptor Definition
+ * GPIO Connection Type
+ */
+typedef enum {
+    AML_INTERRUPT_CONNECTION = 0,
+    AML_IO_CONNECTION = 1,
+} AmlGpioConnectionType;
+
+/*
+ * ACPI 5.0: Table 6-189 GPIO Connection Descriptor Definition
+ * _PPI field definition
+ */
+typedef enum {
+    AML_DEFAULT_CONFIG = 0,
+    AML_PULL_UP = 1,
+    AML_PULL_DOWN = 2,
+    AML_NO_PULL = 3,
+} AmlPinConfig;
+
 typedef
 struct AcpiBuildTables {
     GArray *table_data;
-- 
2.1.0