diff options
Diffstat (limited to 'src/soc/intel/common/block/pcie')
| -rw-r--r-- | src/soc/intel/common/block/pcie/Kconfig | 2 | ||||
| -rw-r--r-- | src/soc/intel/common/block/pcie/Makefile.inc | 2 | ||||
| -rw-r--r-- | src/soc/intel/common/block/pcie/rtd3/Kconfig | 9 | ||||
| -rw-r--r-- | src/soc/intel/common/block/pcie/rtd3/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/soc/intel/common/block/pcie/rtd3/chip.h | 50 | ||||
| -rw-r--r-- | src/soc/intel/common/block/pcie/rtd3/rtd3.c | 299 |
6 files changed, 363 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/pcie/Kconfig b/src/soc/intel/common/block/pcie/Kconfig index 9c42af6c25..25cde37d1a 100644 --- a/src/soc/intel/common/block/pcie/Kconfig +++ b/src/soc/intel/common/block/pcie/Kconfig @@ -7,6 +7,8 @@ config SOC_INTEL_COMMON_BLOCK_PCIE if SOC_INTEL_COMMON_BLOCK_PCIE +source "src/soc/intel/common/block/pcie/*/Kconfig" + config PCIEXP_CLK_PM default y diff --git a/src/soc/intel/common/block/pcie/Makefile.inc b/src/soc/intel/common/block/pcie/Makefile.inc index 0cded9dce7..e2ad685bc3 100644 --- a/src/soc/intel/common/block/pcie/Makefile.inc +++ b/src/soc/intel/common/block/pcie/Makefile.inc @@ -1,2 +1,4 @@ +subdirs-y += ./* + ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_PCIE) += pcie.c ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_PCIE) += pcie_rp.c diff --git a/src/soc/intel/common/block/pcie/rtd3/Kconfig b/src/soc/intel/common/block/pcie/rtd3/Kconfig new file mode 100644 index 0000000000..7c21ce8ced --- /dev/null +++ b/src/soc/intel/common/block/pcie/rtd3/Kconfig @@ -0,0 +1,9 @@ +config SOC_INTEL_COMMON_BLOCK_PCIE_RTD3 + bool + default n + depends on HAVE_ACPI_TABLES + select PMC_IPC_ACPI_INTERFACE + help + When enabled, this driver will add support for ACPI controlled + Runtime D3 using GPIOs for power/reset control of the device + attached to a PCIe root port. diff --git a/src/soc/intel/common/block/pcie/rtd3/Makefile.inc b/src/soc/intel/common/block/pcie/rtd3/Makefile.inc new file mode 100644 index 0000000000..7edea97bd4 --- /dev/null +++ b/src/soc/intel/common/block/pcie/rtd3/Makefile.inc @@ -0,0 +1 @@ +ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_PCIE_RTD3) += rtd3.c diff --git a/src/soc/intel/common/block/pcie/rtd3/chip.h b/src/soc/intel/common/block/pcie/rtd3/chip.h new file mode 100644 index 0000000000..15b8f64891 --- /dev/null +++ b/src/soc/intel/common/block/pcie/rtd3/chip.h @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef __SOC_INTEL_COMMON_BLOCK_PCIE_RTD3_CHIP_H__ +#define __SOC_INTEL_COMMON_BLOCK_PCIE_RTD3_CHIP_H__ + +#include <acpi/acpi_device.h> + +/* Device support at least one of enable/reset GPIO. */ +struct soc_intel_common_block_pcie_rtd3_config { + const char *desc; + + /* 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; + + /* + * SRCCLK assigned to this root port which will be turned off via PMC IPC. + * If set to -1 then the clock will not be disabled in D3. + */ + int srcclk_pin; + + /* + * Add device property indicating the device provides an external PCI port + * for the OS to apply security restrictions. + */ + bool is_external; + + /* + * Allow a device to add the RuntimeD3Storage property even if the detected + * PCI device does not identify as storage class. + */ + bool is_storage; + + /* + * Disable the ACPI-driven L23 Ready-to-Detect transition for the root port. + */ + bool disable_l23; +}; + +#endif /* __SOC_INTEL_COMMON_BLOCK_PCIE_RTD3_CHIP_H__ */ diff --git a/src/soc/intel/common/block/pcie/rtd3/rtd3.c b/src/soc/intel/common/block/pcie/rtd3/rtd3.c new file mode 100644 index 0000000000..be412e7967 --- /dev/null +++ b/src/soc/intel/common/block/pcie/rtd3/rtd3.c @@ -0,0 +1,299 @@ +/* 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/pci_ids.h> +#include <device/pci_ops.h> +#include <device/pci.h> +#include <intelblocks/pmc.h> +#include <intelblocks/pmc_ipc.h> +#include "chip.h" + +/* + * The "ExternalFacingPort" and "HotPlugSupportInD3" properties are defined at + * https://docs.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-root-ports + */ +#define PCIE_EXTERNAL_PORT_UUID "EFCC06CC-73AC-4BC3-BFF0-76143807C389" +#define PCIE_EXTERNAL_PORT_PROPERTY "ExternalFacingPort" + +#define PCIE_HOTPLUG_IN_D3_UUID "6211E2C0-58A3-4AF3-90E1-927A4E0C55A4" +#define PCIE_HOTPLUG_IN_D3_PROPERTY "HotPlugSupportInD3" + +/* + * 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" + +/* PCIe Root Port registers for link status and L23 control. */ +#define PCH_PCIE_CFG_LSTS 0x52 /* Link Status Register */ +#define PCH_PCIE_CFG_SPR 0xe0 /* Scratchpad */ +#define PCH_PCIE_CFG_RPPGEN 0xe2 /* Root Port Power Gating Enable */ +#define PCH_PCIE_CFG_LCAP_PN 0x4f /* Root Port Number */ + +/* ACPI register names corresponding to PCIe root port registers. */ +#define ACPI_REG_PCI_LINK_ACTIVE "LASX" /* Link active status */ +#define ACPI_REG_PCI_L23_RDY_ENTRY "L23E" /* L23_Rdy Entry Request */ +#define ACPI_REG_PCI_L23_RDY_DETECT "L23R" /* L23_Rdy Detect Transition */ +#define ACPI_REG_PCI_L23_SAVE_STATE "NCB7" /* Scratch bit to save L23 state */ + +/* Called from _ON to get PCIe link back to active state. */ +static void pcie_rtd3_acpi_l23_exit(void) +{ + /* Skip if port is not in L2/L3. */ + acpigen_write_if_lequal_namestr_int(ACPI_REG_PCI_L23_SAVE_STATE, 1); + + /* Initiate L2/L3 Ready To Detect transition. */ + acpigen_write_store_int_to_namestr(1, ACPI_REG_PCI_L23_RDY_DETECT); + + /* Wait for transition to detect. */ + acpigen_write_delay_until_namestr_int(320, ACPI_REG_PCI_L23_RDY_DETECT, 0); + + acpigen_write_store_int_to_namestr(0, ACPI_REG_PCI_L23_SAVE_STATE); + + /* Once in detect, wait for link active. */ + acpigen_write_delay_until_namestr_int(128, ACPI_REG_PCI_LINK_ACTIVE, 1); + + acpigen_pop_len(); /* If */ +} + +/* Called from _OFF to put PCIe link into L2/L3 state. */ +static void pcie_rtd3_acpi_l23_entry(void) +{ + /* Initiate L2/L3 Entry request. */ + acpigen_write_store_int_to_namestr(1, ACPI_REG_PCI_L23_RDY_ENTRY); + + /* Wait for L2/L3 Entry request to clear. */ + acpigen_write_delay_until_namestr_int(128, ACPI_REG_PCI_L23_RDY_ENTRY, 0); + + acpigen_write_store_int_to_namestr(1, ACPI_REG_PCI_L23_SAVE_STATE); +} + +static void +pcie_rtd3_acpi_method_on(unsigned int pcie_rp, + const struct soc_intel_common_block_pcie_rtd3_config *config) +{ + acpigen_write_method_serialized("_ON", 0); + + /* Assert enable GPIO to turn on device power. */ + if (config->enable_gpio.pin_count) { + acpigen_enable_tx_gpio(&config->enable_gpio); + if (config->enable_delay_ms) + acpigen_write_sleep(config->enable_delay_ms); + } + + /* Enable SRCCLK for root port if pin is defined. */ + if (config->srcclk_pin >= 0) + pmc_ipc_acpi_set_pci_clock(pcie_rp, config->srcclk_pin, true); + + /* De-assert reset GPIO to bring device out of reset. */ + if (config->reset_gpio.pin_count) { + acpigen_disable_tx_gpio(&config->reset_gpio); + if (config->reset_delay_ms) + acpigen_write_sleep(config->reset_delay_ms); + } + + /* Trigger L23 ready exit flow unless disabld by config. */ + if (!config->disable_l23) + pcie_rtd3_acpi_l23_exit(); + + acpigen_pop_len(); /* Method */ +} + +static void +pcie_rtd3_acpi_method_off(int pcie_rp, + const struct soc_intel_common_block_pcie_rtd3_config *config) +{ + acpigen_write_method_serialized("_OFF", 0); + + /* Trigger L23 ready entry flow unless disabled by config. */ + if (!config->disable_l23) + pcie_rtd3_acpi_l23_entry(); + + /* Assert reset GPIO to place device into reset. */ + if (config->reset_gpio.pin_count) { + acpigen_enable_tx_gpio(&config->reset_gpio); + if (config->reset_off_delay_ms) + acpigen_write_sleep(config->reset_off_delay_ms); + } + + /* Disable SRCCLK for this root port if pin is defined. */ + if (config->srcclk_pin >= 0) + pmc_ipc_acpi_set_pci_clock(pcie_rp, config->srcclk_pin, false); + + /* De-assert enable GPIO to turn off device power. */ + if (config->enable_gpio.pin_count) { + acpigen_disable_tx_gpio(&config->enable_gpio); + if (config->enable_off_delay_ms) + acpigen_write_sleep(config->enable_off_delay_ms); + } + + acpigen_pop_len(); /* Method */ +} + +static void +pcie_rtd3_acpi_method_status(int pcie_rp, + const struct soc_intel_common_block_pcie_rtd3_config *config) +{ + const struct acpi_gpio *gpio; + + acpigen_write_method("_STA", 0); + + /* Use enable GPIO for status if provided, otherwise use reset GPIO. */ + if (config->enable_gpio.pin_count) + gpio = &config->enable_gpio; + else + gpio = &config->reset_gpio; + + /* Read current GPIO value into Local0. */ + acpigen_get_tx_gpio(gpio); + + /* Ensure check works for both active low and active high GPIOs. */ + acpigen_write_store_int_to_op(gpio->active_low, LOCAL1_OP); + + acpigen_write_if_lequal_op_op(LOCAL0_OP, LOCAL1_OP); + acpigen_write_return_op(ZERO_OP); + acpigen_pop_len(); /* If */ + acpigen_write_else(); + acpigen_write_return_op(ONE_OP); + acpigen_pop_len(); /* Else */ + + acpigen_pop_len(); /* Method */ +} + +static void pcie_rtd3_acpi_fill_ssdt(const struct device *dev) +{ + const struct soc_intel_common_block_pcie_rtd3_config *config = config_of(dev); + static const char *const power_res_states[] = {"_PR0"}; + const struct device *parent = dev->bus->dev; + const char *scope = acpi_device_path(parent); + const struct opregion opregion = OPREGION("PXCS", PCI_CONFIG, 0, 0xff); + const struct fieldlist fieldlist[] = { + FIELDLIST_OFFSET(PCH_PCIE_CFG_LSTS), + FIELDLIST_RESERVED(13), + FIELDLIST_NAMESTR(ACPI_REG_PCI_LINK_ACTIVE, 1), + FIELDLIST_OFFSET(PCH_PCIE_CFG_SPR), + FIELDLIST_RESERVED(7), + FIELDLIST_NAMESTR(ACPI_REG_PCI_L23_SAVE_STATE, 1), + FIELDLIST_OFFSET(PCH_PCIE_CFG_RPPGEN), + FIELDLIST_RESERVED(2), + FIELDLIST_NAMESTR(ACPI_REG_PCI_L23_RDY_ENTRY, 1), + FIELDLIST_NAMESTR(ACPI_REG_PCI_L23_RDY_DETECT, 1), + }; + uint8_t pcie_rp; + struct acpi_dp *dsd, *pkg; + + if (!is_dev_enabled(parent)) { + printk(BIOS_ERR, "%s: root port not enabled\n", __func__); + return; + } + if (!scope) { + printk(BIOS_ERR, "%s: root port scope not found\n", __func__); + return; + } + if (!config->enable_gpio.pin_count && !config->reset_gpio.pin_count) { + printk(BIOS_ERR, "%s: Enable and/or Reset GPIO required for %s.\n", + __func__, scope); + return; + } + if (config->srcclk_pin > CONFIG_MAX_PCIE_CLOCKS) { + printk(BIOS_ERR, "%s: Invalid clock pin %u for %s.\n", __func__, + config->srcclk_pin, scope); + return; + } + + /* Read port number of root port that this device is attached to. */ + pcie_rp = pci_read_config8(parent, PCH_PCIE_CFG_LCAP_PN); + if (pcie_rp == 0 || pcie_rp > CONFIG_MAX_ROOT_PORTS) { + printk(BIOS_ERR, "%s: Invalid root port number: %u\n", __func__, pcie_rp); + return; + } + /* Port number is 1-based, PMC IPC method expects 0-based. */ + pcie_rp--; + + printk(BIOS_INFO, "%s: Enable RTD3 for %s (%s)\n", scope, dev_path(parent), + config->desc ?: dev->chip_ops->name); + + /* The RTD3 power resource is added to the root port, not the device. */ + acpigen_write_scope(scope); + + if (config->desc) + acpigen_write_name_string("_DDN", config->desc); + + acpigen_write_opregion(&opregion); + acpigen_write_field("PXCS", fieldlist, ARRAY_SIZE(fieldlist), + FIELD_ANYACC | FIELD_NOLOCK | FIELD_PRESERVE); + + /* ACPI Power Resource for controlling the attached device power. */ + acpigen_write_power_res("RTD3", 0, 0, power_res_states, ARRAY_SIZE(power_res_states)); + pcie_rtd3_acpi_method_status(pcie_rp, config); + pcie_rtd3_acpi_method_on(pcie_rp, config); + pcie_rtd3_acpi_method_off(pcie_rp, config); + acpigen_pop_len(); /* PowerResource */ + + /* Indicate to the OS that device supports hotplug in D3. */ + dsd = acpi_dp_new_table("_DSD"); + pkg = acpi_dp_new_table(PCIE_HOTPLUG_IN_D3_UUID); + acpi_dp_add_integer(pkg, PCIE_HOTPLUG_IN_D3_PROPERTY, 1); + acpi_dp_add_package(dsd, pkg); + + /* Indicate to the OS if the device provides an External facing port. */ + if (config->is_external) { + pkg = acpi_dp_new_table(PCIE_EXTERNAL_PORT_UUID); + acpi_dp_add_integer(pkg, PCIE_EXTERNAL_PORT_PROPERTY, 1); + acpi_dp_add_package(dsd, pkg); + } + acpi_dp_write(dsd); + + /* + * Check the sibling device on the root port to see if it is storage class and add the + * property for the OS to enable storage D3, or allow it to be enabled by config. + */ + if (config->is_storage + || (dev->sibling && (dev->sibling->class >> 16) == PCI_BASE_CLASS_STORAGE)) { + acpigen_write_device(acpi_device_name(dev)); + acpigen_write_ADR(0); + acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON); + acpigen_write_name_integer("_S0W", 4); + + 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); + + acpigen_pop_len(); /* Device */ + + printk(BIOS_INFO, "%s: Added StorageD3Enable property\n", scope); + } + + acpigen_pop_len(); /* Scope */ +} + +static const char *pcie_rtd3_acpi_name(const struct device *dev) +{ + /* Attached device name must be "PXSX" for the Linux Kernel to recognize it. */ + return "PXSX"; +} + +static struct device_operations pcie_rtd3_ops = { + .read_resources = noop_read_resources, + .set_resources = noop_set_resources, + .acpi_fill_ssdt = pcie_rtd3_acpi_fill_ssdt, + .acpi_name = pcie_rtd3_acpi_name, +}; + +static void pcie_rtd3_acpi_enable(struct device *dev) +{ + dev->ops = &pcie_rtd3_ops; +} + +struct chip_operations soc_intel_common_block_pcie_rtd3_ops = { + CHIP_NAME("Intel PCIe Runtime D3") + .enable_dev = pcie_rtd3_acpi_enable +}; |