| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <acpi/acpigen.h> |
| #include <acpi/acpi_device.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/path.h> |
| #include <gpio.h> |
| #include <string.h> |
| #include "chip.h" |
| |
| /* Unique ID for the retimer _DSM. */ |
| #define INTEL_USB4_RETIMER_DSM_UUID "61788900-C470-42BB-80F0-23A313864593" |
| |
| /* |
| * Arg0: UUID |
| * Arg1: Revision ID (set to 1) |
| * Arg2: Function Index |
| * 0: Query command implemented |
| * 1: Query force power enable state |
| * 2: Set force power state |
| * Arg3: A package containing parameters for the function specified |
| * by the UUID, revision ID and function index. |
| */ |
| |
| static void usb4_retimer_cb_standard_query(void *arg) |
| { |
| /* |
| * ToInteger (Arg1, Local2) |
| * If (Local2 == 1) { |
| * Return(Buffer() {0x07}) |
| * } |
| * Return (Buffer() {0x01}) |
| */ |
| acpigen_write_to_integer(ARG1_OP, LOCAL2_OP); |
| |
| /* Revision 1 supports 2 Functions beyond the standard query */ |
| acpigen_write_if_lequal_op_int(LOCAL2_OP, 1); |
| acpigen_write_return_singleton_buffer(0x07); |
| acpigen_pop_len(); /* If */ |
| |
| /* Other revisions support no additional functions */ |
| acpigen_write_return_singleton_buffer(0); |
| } |
| |
| static void usb4_retimer_cb_get_power_state(void *arg) |
| { |
| struct acpi_gpio *power_gpio = arg; |
| |
| /* |
| * // Read power gpio into Local0 |
| * Store (\_SB.PCI0.GTXS (power_gpio), Local0) |
| * Return (Local0) |
| */ |
| acpigen_get_tx_gpio(power_gpio); |
| acpigen_write_return_op(LOCAL0_OP); |
| } |
| |
| static void usb4_retimer_cb_set_power_state(void *arg) |
| { |
| struct acpi_gpio *power_gpio = arg; |
| |
| /* |
| * // Get argument for on/off from Arg3[0] |
| * Local0 = DeRefOf (Arg3[0]) |
| */ |
| acpigen_get_package_op_element(ARG3_OP, 0, LOCAL0_OP); |
| |
| /* |
| * If (Local0 == 0) { |
| * // Turn power off |
| * \_SB.PCI0.CTXS (power_gpio) |
| * } |
| */ |
| acpigen_write_if_lequal_op_int(LOCAL0_OP, 0); |
| acpigen_disable_tx_gpio(power_gpio); |
| acpigen_pop_len(); /* If */ |
| |
| /* |
| * Else { |
| * // Turn power on |
| * \_SB.PCI0.STXS (power_gpio) |
| * } |
| */ |
| acpigen_write_else(); |
| acpigen_enable_tx_gpio(power_gpio); |
| acpigen_pop_len(); |
| |
| /* Return (Zero) */ |
| acpigen_write_return_integer(0); |
| } |
| |
| static void (*usb4_retimer_callbacks[3])(void *) = { |
| usb4_retimer_cb_standard_query, /* Function 0 */ |
| usb4_retimer_cb_get_power_state, /* Function 1 */ |
| usb4_retimer_cb_set_power_state, /* Function 2 */ |
| }; |
| |
| static void usb4_retimer_fill_ssdt(const struct device *dev) |
| { |
| const struct drivers_intel_usb4_retimer_config *config = dev->chip_info; |
| const char *scope = acpi_device_scope(dev); |
| |
| if (!scope || !config) |
| return; |
| |
| if (!config->power_gpio.pin_count) { |
| printk(BIOS_ERR, "%s: Power GPIO required for %s\n", __func__, dev_path(dev)); |
| return; |
| } |
| |
| /* Write the _DSM that toggles power with provided GPIO. */ |
| acpigen_write_scope(scope); |
| acpigen_write_dsm(INTEL_USB4_RETIMER_DSM_UUID, usb4_retimer_callbacks, |
| ARRAY_SIZE(usb4_retimer_callbacks), (void *)&config->power_gpio); |
| acpigen_pop_len(); /* Scope */ |
| |
| printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), dev->chip_ops->name, |
| dev_path(dev)); |
| } |
| |
| static struct device_operations usb4_retimer_dev_ops = { |
| .read_resources = noop_read_resources, |
| .set_resources = noop_set_resources, |
| .acpi_fill_ssdt = usb4_retimer_fill_ssdt, |
| }; |
| |
| static void usb4_retimer_enable(struct device *dev) |
| { |
| dev->ops = &usb4_retimer_dev_ops; |
| } |
| |
| struct chip_operations drivers_intel_usb4_retimer_ops = { |
| CHIP_NAME("Intel USB4 Retimer") |
| .enable_dev = usb4_retimer_enable |
| }; |