diff options
Diffstat (limited to 'src/drivers/pcie')
| -rw-r--r-- | src/drivers/pcie/rtd3/device/Kconfig | 6 | ||||
| -rw-r--r-- | src/drivers/pcie/rtd3/device/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/drivers/pcie/rtd3/device/chip.c | 169 | ||||
| -rw-r--r-- | src/drivers/pcie/rtd3/device/chip.h | 28 |
4 files changed, 204 insertions, 0 deletions
diff --git a/src/drivers/pcie/rtd3/device/Kconfig b/src/drivers/pcie/rtd3/device/Kconfig new file mode 100644 index 0000000000..7fecd57580 --- /dev/null +++ b/src/drivers/pcie/rtd3/device/Kconfig @@ -0,0 +1,6 @@ +config DRIVERS_PCIE_RTD3_DEVICE + bool + depends on HAVE_ACPI_TABLES + help + When enabled, this driver will add support for ACPI controlled + Runtime D3 using GPIOs for power/reset control of the PCIe device. diff --git a/src/drivers/pcie/rtd3/device/Makefile.inc b/src/drivers/pcie/rtd3/device/Makefile.inc new file mode 100644 index 0000000000..df4aaf63ab --- /dev/null +++ b/src/drivers/pcie/rtd3/device/Makefile.inc @@ -0,0 +1 @@ +ramstage-$(CONFIG_DRIVERS_PCIE_RTD3_DEVICE) += chip.c diff --git a/src/drivers/pcie/rtd3/device/chip.c b/src/drivers/pcie/rtd3/device/chip.c new file mode 100644 index 0000000000..349dffd037 --- /dev/null +++ b/src/drivers/pcie/rtd3/device/chip.c @@ -0,0 +1,169 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include <acpi/acpi_device.h> +#include <acpi/acpigen.h> +#include <acpi/acpigen_pci.h> +#include <assert.h> +#include <console/console.h> +#include <device/device.h> +#include <device/pci.h> +#include <device/pci_ids.h> +#include <device/pci_ops.h> +#include "chip.h" + +/* + * This UUID and the resulting ACPI Device Property is defined by the + * Power Management for Storage Hardware Devices: + * + * https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/power-management-for-storage-hardware-devices-intro + */ +#define PCIE_RTD3_STORAGE_UUID "5025030F-842F-4AB4-A561-99A5189762D0" +#define PCIE_RTD3_STORAGE_PROPERTY "StorageD3Enable" + +/* + * Writes the ACPI power resources for a PCI device so it can enter D3Cold. + * + * If the device is a storage class, then the StorageD3Enable _DSD will + * also be added. + * + * e.g., + * + * Scope (\_SB.PCI0.GP14) + * { + * Device (NVME) + * { + * Name (_PR0, Package (0x01) // _PR0: Power Resources for D0 + * { + * PRIC + * }) + * Name (_PR3, Package (0x01) // _PR3: Power Resources for D3hot + * { + * PRIC + * }) + * PowerResource (PRIC, 0x00, 0x0000) + * { + * Method (_STA, 0, NotSerialized) // _STA: Status + * { + * ... + * } + * + * Method (_ON, 0, Serialized) // _ON_: Power On + * { + * ... + * } + * + * Method (_OFF, 0, Serialized) // _OFF: Power Off + * { + * ... + * } + * } + * + * Name (_ADR, 0x0000000000000000) // _ADR: Address + * Method (_STA, 0, NotSerialized) // _STA: Status + * { + * Return (0x0F) + * } + * + * Name (_DSD, Package (0x02) // _DSD: Device-Specific Data + * { + * ToUUID ("5025030f-842f-4ab4-a561-99a5189762d0"), + * Package (0x01) + * { + * Package (0x02) + * { + * "StorageD3Enable", + * One + * } + * } + * }) + * } + * } + */ +static void pcie_rtd3_device_acpi_fill_ssdt(const struct device *dev) +{ + struct acpi_dp *dsd, *pkg; + const struct drivers_pcie_rtd3_device_config *config = config_of(dev); + /* Copy the GPIOs to avoid discards 'const' qualifier error */ + struct acpi_gpio reset_gpio = config->reset_gpio; + struct acpi_gpio enable_gpio = config->enable_gpio; + const struct acpi_power_res_params power_res_params = { + .reset_gpio = &reset_gpio, + .reset_delay_ms = config->reset_delay_ms, + .reset_off_delay_ms = config->reset_off_delay_ms, + .enable_gpio = &enable_gpio, + .enable_delay_ms = config->enable_delay_ms, + .enable_off_delay_ms = config->enable_off_delay_ms, + .use_gpio_for_status = true, + }; + const char *scope = acpi_device_scope(dev); + const char *name = acpi_device_name(dev); + + assert(name); + assert(scope); + + printk(BIOS_INFO, "%s.%s: Enable RTD3 for %s (%s)\n", scope, name, dev_path(dev), + dev->chip_ops->name); + + acpigen_write_scope(scope); + acpigen_write_device(acpi_device_name(dev)); + + acpi_device_add_power_res(&power_res_params); + + acpigen_write_ADR_pci_device(dev); + acpigen_write_STA(acpi_device_status(dev)); + + /* Storage devices won't enter D3 without this property */ + if ((dev->class >> 16) == PCI_BASE_CLASS_STORAGE) { + dsd = acpi_dp_new_table("_DSD"); + pkg = acpi_dp_new_table(PCIE_RTD3_STORAGE_UUID); + acpi_dp_add_integer(pkg, PCIE_RTD3_STORAGE_PROPERTY, 1); + acpi_dp_add_package(dsd, pkg); + acpi_dp_write(dsd); + + printk(BIOS_INFO, "%s.%s: Added StorageD3Enable property\n", scope, name); + } + + acpigen_write_device_end(); + acpigen_write_scope_end(); + + /* Call the default PCI acpi_fill_ssdt */ + pci_rom_ssdt(dev); +} + +static const char *pcie_rtd3_device_acpi_name(const struct device *dev) +{ + const struct drivers_pcie_rtd3_device_config *config = config_of(dev); + + return config->name; +} + +static struct device_operations pcie_rtd3_device_ops = { + .read_resources = pci_dev_read_resources, + .set_resources = pci_dev_set_resources, + .enable_resources = pci_dev_enable_resources, + .init = pci_dev_init, + .ops_pci = &pci_dev_ops_pci, + .write_acpi_tables = pci_rom_write_acpi_tables, + .acpi_fill_ssdt = pcie_rtd3_device_acpi_fill_ssdt, + .acpi_name = pcie_rtd3_device_acpi_name, +}; + +static void pcie_rtd3_device_enable(struct device *dev) +{ + struct drivers_pcie_rtd3_device_config *config = dev ? dev->chip_info : NULL; + + if (!config) + return; + + if (dev->path.type != DEVICE_PATH_PCI) { + printk(BIOS_ERR, "%s: Invalid device type\n", dev_path(dev)); + return; + } + + dev->ops = &pcie_rtd3_device_ops; +} + +struct chip_operations drivers_pcie_rtd3_device_ops = { + CHIP_NAME("PCIe Device w/ Runtime D3") + .enable_dev = pcie_rtd3_device_enable +}; diff --git a/src/drivers/pcie/rtd3/device/chip.h b/src/drivers/pcie/rtd3/device/chip.h new file mode 100644 index 0000000000..e1a8aa7833 --- /dev/null +++ b/src/drivers/pcie/rtd3/device/chip.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef __DRIVERS_PCIE_RTD3_DEVICE_CHIP_H__ +#define __DRIVERS_PCIE_RTD3_DEVICE_CHIP_H__ + +#include <acpi/acpi_device.h> + +/* Adds a GPIO controlled ACPI PowerResource for a PCIe device. */ +struct drivers_pcie_rtd3_device_config { + /* Name of ACPI node for the device */ + const char *name; + + /* GPIO used to enable device. */ + struct acpi_gpio enable_gpio; + /* Delay to be inserted after device is enabled. */ + unsigned int enable_delay_ms; + /* Delay to be inserted after device is disabled. */ + unsigned int enable_off_delay_ms; + + /* GPIO used to take device out of reset or to put it into reset. */ + struct acpi_gpio reset_gpio; + /* Delay to be inserted after device is taken out of reset. */ + unsigned int reset_delay_ms; + /* Delay to be inserted after device is put into reset. */ + unsigned int reset_off_delay_ms; +}; + +#endif /* __DRIVERS_PCIE_RTD3_DEVICE_CHIP_H__ */ |