acpigen: Add more useful helper functions

acpigen_write_debug_namestr() - Debug = NAME
acpigen_write_return_namestr() - Return (NAME)
acpigen_set_package_op_element_int() - Set package pointer element
 DeRefOf (PKG[ELEM]) = INT
acpigen_get_package_element() - Get package (not pointer) element
 dest_op = PKG[ELEM]
acpigen_set_package_element_int() - Set package element to integer
 PKG[ELEM] = INT
acpigen_set_package_element_namestr() - Set package element to namestr
 PKG[ELEM] = NAME
acpigen_write_delay_until_namestr_int() - Delay while waiting for
register to equal expected value.

BUG=b:160996445

Signed-off-by: Duncan Laurie <dlaurie@google.com>
Change-Id: I9b20a23872b7d4a50f03761032426ffbb722b9ee
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47196
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/acpi/acpigen.c

@@ -342,7 +342,7 @@ void acpigen_write_scope(const char *name)
 
 void acpigen_get_package_op_element(uint8_t package_op, unsigned int element, uint8_t dest_op)
 {
-	/* <dest_op> = DeRefOf (<package_op>[<element]) */
+	/* <dest_op> = DeRefOf (<package_op>[<element>]) */
 	acpigen_write_store();
 	acpigen_emit_byte(DEREF_OP);
 	acpigen_emit_byte(INDEX_OP);
@@ -352,6 +352,52 @@ void acpigen_get_package_op_element(uint8_t package_op, unsigned int element, ui
 	acpigen_emit_byte(dest_op);
 }
 
+void acpigen_set_package_op_element_int(uint8_t package_op, unsigned int element, uint64_t src)
+{
+	/* DeRefOf (<package>[<element>]) = <src> */
+	acpigen_write_store();
+	acpigen_write_integer(src);
+	acpigen_emit_byte(DEREF_OP);
+	acpigen_emit_byte(INDEX_OP);
+	acpigen_emit_byte(package_op);
+	acpigen_write_integer(element);
+	acpigen_emit_byte(ZERO_OP); /* Ignore Index() Destination */
+}
+
+void acpigen_get_package_element(const char *package, unsigned int element, uint8_t dest_op)
+{
+	/* <dest_op> = <package>[<element>] */
+	acpigen_write_store();
+	acpigen_emit_byte(INDEX_OP);
+	acpigen_emit_namestring(package);
+	acpigen_write_integer(element);
+	acpigen_emit_byte(ZERO_OP); /* Ignore Index() Destination */
+	acpigen_emit_byte(dest_op);
+}
+
+void acpigen_set_package_element_int(const char *package, unsigned int element, uint64_t src)
+{
+	/* <package>[<element>] = <src> */
+	acpigen_write_store();
+	acpigen_write_integer(src);
+	acpigen_emit_byte(INDEX_OP);
+	acpigen_emit_namestring(package);
+	acpigen_write_integer(element);
+	acpigen_emit_byte(ZERO_OP); /* Ignore Index() Destination */
+}
+
+void acpigen_set_package_element_namestr(const char *package, unsigned int element,
+					 const char *src)
+{
+	/* <package>[<element>] = <src> */
+	acpigen_write_store();
+	acpigen_emit_namestring(src);
+	acpigen_emit_byte(INDEX_OP);
+	acpigen_emit_namestring(package);
+	acpigen_write_integer(element);
+	acpigen_emit_byte(ZERO_OP); /* Ignore Index() Destination */
+}
+
 void acpigen_write_processor(u8 cpuindex, u32 pblock_addr, u8 pblock_len)
 {
 /*
@@ -1320,6 +1366,14 @@ void acpigen_write_debug_op(uint8_t op)
 	acpigen_emit_ext_op(DEBUG_OP);
 }
 
+/* Store (str, DEBUG) */
+void acpigen_write_debug_namestr(const char *str)
+{
+	acpigen_write_store();
+	acpigen_emit_namestring(str);
+	acpigen_emit_ext_op(DEBUG_OP);
+}
+
 void acpigen_write_if(void)
 {
 	acpigen_emit_byte(IF_OP);
@@ -1455,6 +1509,12 @@ void acpigen_write_return_integer(uint64_t arg)
 	acpigen_write_integer(arg);
 }
 
+void acpigen_write_return_namestr(const char *arg)
+{
+	acpigen_emit_byte(RETURN_OP);
+	acpigen_emit_namestring(arg);
+}
+
 void acpigen_write_return_string(const char *arg)
 {
 	acpigen_emit_byte(RETURN_OP);
@@ -2098,3 +2158,35 @@ void acpigen_write_xpss_object(const struct acpi_xpss_sw_pstate *pstate_values,
 
 	acpigen_pop_len();
 }
+
+/* Delay up to wait_ms until provided namestr matches expected value. */
+void acpigen_write_delay_until_namestr_int(uint32_t wait_ms, const char *name, uint64_t value)
+{
+	uint32_t wait_ms_segment = 1;
+	uint32_t segments = wait_ms;
+
+	/* Sleep in 16ms segments if delay is more than 32ms. */
+	if (wait_ms > 32) {
+		wait_ms_segment = 16;
+		segments = wait_ms / 16;
+	}
+
+	acpigen_write_store_int_to_op(segments, LOCAL7_OP);
+	acpigen_emit_byte(WHILE_OP);
+	acpigen_write_len_f();
+	acpigen_emit_byte(LGREATER_OP);
+	acpigen_emit_byte(LOCAL7_OP);
+	acpigen_emit_byte(ZERO_OP);
+
+	/* If name is not provided then just delay in a loop. */
+	if (name) {
+		acpigen_write_if_lequal_namestr_int(name, value);
+		acpigen_emit_byte(BREAK_OP);
+		acpigen_pop_len(); /* If */
+	}
+
+	acpigen_write_sleep(wait_ms_segment);
+	acpigen_emit_byte(DECREMENT_OP);
+	acpigen_emit_byte(LOCAL7_OP);
+	acpigen_pop_len(); /* While */
+}

src/include/acpi/acpigen.h

@@ -286,6 +286,7 @@ struct cppc_config {
 };
 
 void acpigen_write_return_integer(uint64_t arg);
+void acpigen_write_return_namestr(const char *arg);
 void acpigen_write_return_string(const char *arg);
 void acpigen_write_len_f(void);
 void acpigen_pop_len(void);
@@ -374,6 +375,7 @@ void acpigen_write_xor(uint8_t arg1, uint8_t arg2, uint8_t res);
 void acpigen_write_and(uint8_t arg1, uint8_t arg2, uint8_t res);
 void acpigen_write_not(uint8_t arg, uint8_t res);
 void acpigen_write_debug_string(const char *str);
+void acpigen_write_debug_namestr(const char *str);
 void acpigen_write_debug_integer(uint64_t val);
 void acpigen_write_debug_op(uint8_t op);
 void acpigen_write_if(void);
@@ -466,7 +468,7 @@ int get_cst_entries(acpi_cstate_t **);
 
 /*
  * Get element from package into specified destination op:
- *   <dest_op> = DeRefOf (<package_op>[<element])
+ *   <dest_op> = DeRefOf (<package_op>[<element>])
  *
  * Example:
  *  acpigen_get_package_op_element(ARG0_OP, 0, LOCAL0_OP)
@@ -474,6 +476,25 @@ int get_cst_entries(acpi_cstate_t **);
  */
 void acpigen_get_package_op_element(uint8_t package_op, unsigned int element, uint8_t dest_op);
 
+/* Set element of package op to specified op:  DeRefOf (<package>[<element>]) = <src> */
+void acpigen_set_package_op_element_int(uint8_t package_op, unsigned int element, uint64_t src);
+
+/* Get element from package to specified op:  <dest_op> = <package>[<element>] */
+void acpigen_get_package_element(const char *package, unsigned int element, uint8_t dest_op);
+
+/* Set element of package to specified op:  <package>[<element>] = <src> */
+void acpigen_set_package_element_int(const char *package, unsigned int element, uint64_t src);
+
+/* Set element of package to specified namestr:  <package>[<element>] = <src> */
+void acpigen_set_package_element_namestr(const char *package, unsigned int element,
+					 const char *src);
+
+/*
+ * Delay up to wait_ms milliseconds until the provided name matches the expected value.
+ * If wait_ms is >= 32ms then it will wait in 16ms chunks.  This function uses LOCAL7_OP.
+ */
+void acpigen_write_delay_until_namestr_int(uint32_t wait_ms, const char *name, uint64_t value);
+
 /*
  * Soc-implemented functions for generating ACPI AML code for GPIO handling. All
  * these functions are expected to use only Local5, Local6 and Local7