superio/common: Add more ACPI methods
* Make use of introduced SSDT config mode access * Make use of introduced SSDT mutex * Provide ACPI functions to safely access SIO config space * Implement method to query LDN enable state * Implement method to set LDN enable state * Use introduced functions to implement _DIS and _STA in the device * Update documentation Tested on Aspeed AST2500 and Linux 5.2. Manually verified ACPI code that generates no errors in Linux. Change-Id: I520b29de925f368cd71ff8f1f58d2d57d72eff8d Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37640 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
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@ -45,12 +45,33 @@ chip superio/common
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end
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```
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## Automatically generated methods
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The following methods are generated for each SuperIO:
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## AMTX()
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Acquire the global mutex and enter config mode.
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It's called this at the begining of an atomic operation to make sure
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no other ACPI code messes with the config space while working on it.
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## RMTX()
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Exit config mode and release the global mutex.
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It's called at the end of an atomic operation.
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## SLDN(Arg0)
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Selects the (virtual) LDN given as Arg0.
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This method isn't guarded with the global mutex.
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## DLDN(Arg0)
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Disables the (virtual) LDN given as Arg0.
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This method aquires the global mutex.
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## QLDN(Arg0)
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Queries the state of the (virtual) LDN given as Arg0.
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This method quires the global mutex.
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## TODO
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1) Add ACPI HIDs to every SuperIO driver
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2) Don't guess ACPI HID of LDNs if it's known
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3) Add "enter config" and "exit config" bytes
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4) Generate support methods that allow
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2) Generate support methods that allow
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* Setting resource settings at runtime
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* Getting resource settings at runtime
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* Disabling LDNs at runtime
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@ -156,6 +156,146 @@ static void generic_ssdt(struct device *dev)
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acpigen_write_indexfield("INDX", "DATA", i, ARRAY_SIZE(i), FIELD_BYTEACC |
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FIELD_NOLOCK | FIELD_PRESERVE);
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const char *mutex = "MTX0";
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acpigen_write_mutex(mutex, 0);
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/* Backup LDN */
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acpigen_write_name_integer("BLDN", 0);
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/* Acquire mutex - Enter config mode */
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acpigen_write_method("AMTX", 0);
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{
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acpigen_write_acquire(mutex, 0xffff);
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/* Pick one of the children as the generic SIO doesn't have config mode */
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if (dev->link_list && dev->link_list->children)
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pnp_ssdt_enter_conf_mode(dev->link_list->children, "^INDX", "^DATA");
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/* Backup LDN */
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acpigen_write_store();
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acpigen_emit_namestring("^LDN");
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acpigen_emit_namestring("^BLDN");
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}
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acpigen_pop_len(); /* Method */
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/* Release mutex - Exit config mode */
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acpigen_write_method("RMTX", 0);
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{
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/* Restore LDN */
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acpigen_write_store();
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acpigen_emit_namestring("^BLDN");
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acpigen_emit_namestring("^LDN");
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/* Pick one of the children as the generic SIO doesn't have config mode */
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if (dev->link_list && dev->link_list->children)
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pnp_ssdt_exit_conf_mode(dev->link_list->children, "^INDX", "^DATA");
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acpigen_write_release(mutex);
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}
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acpigen_pop_len(); /* Method */
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/* Select a LDN */
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acpigen_write_method("SLDN", 1);
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{
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/* Local0 = Arg0 & 0xff */
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acpigen_emit_byte(AND_OP);
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acpigen_write_integer(0xff);
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acpigen_emit_byte(ARG0_OP);
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acpigen_emit_byte(LOCAL0_OP);
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/* LDN = LOCAL0_OP */
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acpigen_write_store();
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acpigen_emit_byte(LOCAL0_OP);
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acpigen_emit_namestring("^LDN");
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}
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acpigen_pop_len(); /* Method */
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/* Disable a LDN/VLDN */
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acpigen_write_method("DLDN", 1);
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{
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/* AMTX() */
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acpigen_emit_namestring("AMTX");
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/* SLDN (Local0) */
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acpigen_emit_namestring("SLDN");
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acpigen_emit_byte(ARG0_OP);
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/* Local0 = Arg0 >> 8 */
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acpigen_emit_byte(SHIFT_RIGHT_OP);
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acpigen_emit_byte(ARG0_OP);
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acpigen_write_integer(8);
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acpigen_emit_byte(LOCAL0_OP);
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/* Local0 = Local0 & 0x7 */
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acpigen_emit_byte(AND_OP);
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acpigen_write_integer(0x7);
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acpigen_emit_byte(LOCAL0_OP);
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acpigen_emit_byte(LOCAL0_OP);
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for (int j = 0; j < 8; j++) {
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char act[6] = "^ACT0";
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act[4] += j;
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/* If (Local0 == j) { */
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acpigen_write_if_lequal_op_int(LOCAL0_OP, j);
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/* ACT[j] = 0 */
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acpigen_write_store();
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acpigen_emit_byte(ZERO_OP);
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acpigen_emit_namestring(act);
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acpigen_pop_len(); /* } */
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}
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/* RMTX() */
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acpigen_emit_namestring("RMTX");
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}
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acpigen_pop_len(); /* Method */
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/* Query LDN enable state. Returns 1 if LDN/VLDN is enabled. */
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acpigen_write_method("QLDN", 1);
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{
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acpigen_emit_namestring("AMTX");
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/* SLDN (Local0) */
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acpigen_emit_namestring("SLDN");
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acpigen_emit_byte(ARG0_OP);
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/* Local0 = Arg0 >> 8 */
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acpigen_emit_byte(SHIFT_RIGHT_OP);
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acpigen_emit_byte(ARG0_OP);
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acpigen_write_integer(8);
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acpigen_emit_byte(LOCAL0_OP);
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/* Local0 = Local0 & 0x7 */
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acpigen_emit_byte(AND_OP);
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acpigen_write_integer(0x7);
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acpigen_emit_byte(LOCAL0_OP);
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acpigen_emit_byte(LOCAL0_OP);
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for (int j = 0; j < 8; j++) {
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char act[6] = "^ACT0";
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act[4] += j;
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/* If (Local0 == j) { */
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acpigen_write_if_lequal_op_int(LOCAL0_OP, j);
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/* Local1 = ACT[j] */
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acpigen_write_store();
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acpigen_emit_namestring(act);
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acpigen_emit_byte(LOCAL1_OP);
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acpigen_pop_len(); /* } */
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}
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/* RMTX() */
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acpigen_emit_namestring("RMTX");
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/* Return (Local1) */
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acpigen_emit_byte(RETURN_OP);
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acpigen_emit_byte(LOCAL1_OP);
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}
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acpigen_pop_len(); /* Method */
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acpigen_pop_len(); /* Device */
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acpigen_pop_len(); /* Scope */
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}
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@ -200,7 +200,24 @@ void superio_common_fill_ssdt_generator(struct device *dev)
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acpigen_write_name_byte("LDN", ldn);
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acpigen_write_name_byte("VLDN", vldn);
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acpigen_write_STA(dev->enabled ? 0xf : 0);
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acpigen_write_method("_STA", 0);
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{
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acpigen_write_store();
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acpigen_emit_namestring("^^QLDN");
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acpigen_write_integer(ldn);
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acpigen_emit_byte(LOCAL0_OP);
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/* Multiply (Local0, 0xf, Local0) */
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acpigen_emit_byte(MULTIPLY_OP);
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acpigen_emit_byte(LOCAL0_OP);
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acpigen_write_integer(0xf);
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acpigen_emit_byte(LOCAL0_OP);
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acpigen_emit_byte(RETURN_OP);
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acpigen_emit_byte(LOCAL0_OP);
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}
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acpigen_pop_len(); /* Method */
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if (!dev->enabled) {
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acpigen_pop_len(); /* Device */
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@ -242,6 +259,13 @@ void superio_common_fill_ssdt_generator(struct device *dev)
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acpigen_write_name_string("_HID", hid);
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acpigen_write_name_string("_DDN", name_from_hid(hid));
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acpigen_write_method("_DIS", 0);
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{
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acpigen_emit_namestring("^^DLDN");
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acpigen_write_integer(ldn);
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}
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acpigen_pop_len(); /* Method */
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acpigen_pop_len(); /* Device */
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acpigen_pop_len(); /* Scope */
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}
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