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drivers/espi: it8xxx2: Add a config to share h2ram pool space #99139

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Merged
merged 1 commit into from
Nov 13, 2025
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drivers/espi: it8xxx2: Add a config to share h2ram pool space #99139

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16 changes: 16 additions & 0 deletions drivers/espi/Kconfig.it8xxx2
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Original file line number Diff line number Diff line change
Expand Up @@ -145,4 +145,20 @@ config ESPI_IT8XXX2_PORT_81_CYCLE
This allows EC to accept 2 bytes of port 80 data written from the Host.
(e.g. using iotools: iotools io_write16 0x80 0x1234)

config ESPI_IT8XXX2_H2RAM_SHARED
bool "Shared access to h2ram_pool"
help
Enabling this option exposes the eSPI driver h2ram_pool as a
global symbol (non-static), allowing other modules to reuse
this memory space.
The configurations CONFIG_ESPI_PERIPHERAL_HOST_CMD_PARAM_PORT_NUM and
CONFIG_ESPI_PERIPHERAL_ACPI_SHM_REGION_PORT_NUM have a gap in RAM space.
By enabling CONFIG_ESPI_IT8XXX2_H2RAM_SHARED, this unused gap can be
reused by other modules to reduce overall RAM usage.

NOTE: A build-time assertion must ensure that the shared region size
does not exceed the available space defined by
CONFIG_ESPI_PERIPHERAL_HOST_CMD_PARAM_PORT_NUM and
CONFIG_ESPI_PERIPHERAL_ACPI_SHM_REGION_PORT_NUM.

endif #ESPI_IT8XXX2
10 changes: 8 additions & 2 deletions drivers/espi/espi_it8xxx2.c
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Expand Up @@ -948,8 +948,14 @@ static const struct ec2i_t pmc2_settings[] = {
#endif
#endif

static uint8_t h2ram_pool[MAX(H2RAM_ACPI_SHM_MAX, H2RAM_EC_HOST_CMD_MAX)]
__attribute__((section(".h2ram_pool")));
#ifdef CONFIG_ESPI_IT8XXX2_H2RAM_SHARED
#define H2RAM_STORAGE
#else
#define H2RAM_STORAGE static
#endif

H2RAM_STORAGE uint8_t h2ram_pool[MAX(H2RAM_ACPI_SHM_MAX, H2RAM_EC_HOST_CMD_MAX)]
__attribute__((section(".h2ram_pool")));

#define H2RAM_WINDOW_SIZE(ram_size) ((find_msb_set((ram_size) / 16) - 1) & 0x7)

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