Duncan Laurie | 2cc126b | 2020-08-28 19:46:35 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | |
| 3 | #include <acpi/acpigen.h> |
| 4 | #include <acpi/acpi_device.h> |
| 5 | #include <console/console.h> |
| 6 | #include <device/device.h> |
| 7 | #include <device/path.h> |
| 8 | #include <gpio.h> |
| 9 | #include <string.h> |
| 10 | #include "chip.h" |
| 11 | |
| 12 | /* Unique ID for the retimer _DSM. */ |
| 13 | #define INTEL_USB4_RETIMER_DSM_UUID "61788900-C470-42BB-80F0-23A313864593" |
| 14 | |
| 15 | /* |
| 16 | * Arg0: UUID |
| 17 | * Arg1: Revision ID (set to 1) |
| 18 | * Arg2: Function Index |
| 19 | * 0: Query command implemented |
| 20 | * 1: Query force power enable state |
| 21 | * 2: Set force power state |
| 22 | * Arg3: A package containing parameters for the function specified |
| 23 | * by the UUID, revision ID and function index. |
| 24 | */ |
| 25 | |
| 26 | static void usb4_retimer_cb_standard_query(void *arg) |
| 27 | { |
| 28 | /* |
| 29 | * ToInteger (Arg1, Local2) |
| 30 | * If (Local2 == 1) { |
| 31 | * Return(Buffer() {0x07}) |
| 32 | * } |
| 33 | * Return (Buffer() {0x01}) |
| 34 | */ |
| 35 | acpigen_write_to_integer(ARG1_OP, LOCAL2_OP); |
| 36 | |
| 37 | /* Revision 1 supports 2 Functions beyond the standard query */ |
| 38 | acpigen_write_if_lequal_op_int(LOCAL2_OP, 1); |
| 39 | acpigen_write_return_singleton_buffer(0x07); |
| 40 | acpigen_pop_len(); /* If */ |
| 41 | |
| 42 | /* Other revisions support no additional functions */ |
| 43 | acpigen_write_return_singleton_buffer(0); |
| 44 | } |
| 45 | |
| 46 | static void usb4_retimer_cb_get_power_state(void *arg) |
| 47 | { |
| 48 | struct acpi_gpio *power_gpio = arg; |
| 49 | |
| 50 | /* |
| 51 | * // Read power gpio into Local0 |
| 52 | * Store (\_SB.PCI0.GTXS (power_gpio), Local0) |
| 53 | * Return (Local0) |
| 54 | */ |
| 55 | acpigen_get_tx_gpio(power_gpio); |
| 56 | acpigen_write_return_op(LOCAL0_OP); |
| 57 | } |
| 58 | |
| 59 | static void usb4_retimer_cb_set_power_state(void *arg) |
| 60 | { |
| 61 | struct acpi_gpio *power_gpio = arg; |
| 62 | |
| 63 | /* |
| 64 | * // Get argument for on/off from Arg3[0] |
| 65 | * Local0 = DeRefOf (Arg3[0]) |
| 66 | */ |
| 67 | acpigen_get_package_op_element(ARG3_OP, 0, LOCAL0_OP); |
| 68 | |
| 69 | /* |
| 70 | * If (Local0 == 0) { |
| 71 | * // Turn power off |
| 72 | * \_SB.PCI0.CTXS (power_gpio) |
| 73 | * } |
| 74 | */ |
| 75 | acpigen_write_if_lequal_op_int(LOCAL0_OP, 0); |
| 76 | acpigen_disable_tx_gpio(power_gpio); |
| 77 | acpigen_pop_len(); /* If */ |
| 78 | |
| 79 | /* |
| 80 | * Else { |
| 81 | * // Turn power on |
| 82 | * \_SB.PCI0.STXS (power_gpio) |
| 83 | * } |
| 84 | */ |
| 85 | acpigen_write_else(); |
| 86 | acpigen_enable_tx_gpio(power_gpio); |
| 87 | acpigen_pop_len(); |
| 88 | |
| 89 | /* Return (Zero) */ |
| 90 | acpigen_write_return_integer(0); |
| 91 | } |
| 92 | |
| 93 | static void (*usb4_retimer_callbacks[3])(void *) = { |
| 94 | usb4_retimer_cb_standard_query, /* Function 0 */ |
| 95 | usb4_retimer_cb_get_power_state, /* Function 1 */ |
| 96 | usb4_retimer_cb_set_power_state, /* Function 2 */ |
| 97 | }; |
| 98 | |
| 99 | static void usb4_retimer_fill_ssdt(const struct device *dev) |
| 100 | { |
| 101 | const struct drivers_intel_usb4_retimer_config *config = dev->chip_info; |
| 102 | const char *scope = acpi_device_scope(dev); |
| 103 | |
| 104 | if (!dev->enabled || !scope || !config) |
| 105 | return; |
| 106 | |
| 107 | if (!config->power_gpio.pin_count) { |
| 108 | printk(BIOS_ERR, "%s: Power GPIO required for %s\n", __func__, dev_path(dev)); |
| 109 | return; |
| 110 | } |
| 111 | |
| 112 | /* Write the _DSM that toggles power with provided GPIO. */ |
| 113 | acpigen_write_scope(scope); |
| 114 | acpigen_write_dsm(INTEL_USB4_RETIMER_DSM_UUID, usb4_retimer_callbacks, |
| 115 | ARRAY_SIZE(usb4_retimer_callbacks), (void *)&config->power_gpio); |
| 116 | acpigen_pop_len(); /* Scope */ |
| 117 | |
| 118 | printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), dev->chip_ops->name, |
| 119 | dev_path(dev)); |
| 120 | } |
| 121 | |
| 122 | static struct device_operations usb4_retimer_dev_ops = { |
| 123 | .read_resources = noop_read_resources, |
| 124 | .set_resources = noop_set_resources, |
| 125 | .acpi_fill_ssdt = usb4_retimer_fill_ssdt, |
| 126 | }; |
| 127 | |
| 128 | static void usb4_retimer_enable(struct device *dev) |
| 129 | { |
| 130 | dev->ops = &usb4_retimer_dev_ops; |
| 131 | } |
| 132 | |
| 133 | struct chip_operations drivers_intel_usb4_retimer_ops = { |
| 134 | CHIP_NAME("Intel USB4 Retimer") |
| 135 | .enable_dev = usb4_retimer_enable |
| 136 | }; |