diff options
| -rw-r--r-- | zephyr/shim/src/espi.c | 134 |
1 files changed, 128 insertions, 6 deletions
diff --git a/zephyr/shim/src/espi.c b/zephyr/shim/src/espi.c index 78bbd86bee..8f36e1ad50 100644 --- a/zephyr/shim/src/espi.c +++ b/zephyr/shim/src/espi.c @@ -14,13 +14,19 @@ #include "chipset.h" #include "common.h" #include "espi.h" +#include "hooks.h" #include "lpc.h" #include "port80.h" #include "power.h" +#include "timer.h" #include "zephyr_espi_shim.h" +#define VWIRE_PULSE_TRIGGER_TIME 65 + LOG_MODULE_REGISTER(espi_shim, CONFIG_ESPI_LOG_LEVEL); +static bool init_done; + /* * A mapping of platform/ec signals to Zephyr virtual wires. * @@ -181,7 +187,13 @@ int zephyr_shim_setup_espi(void) int espi_vw_set_wire(enum espi_vw_signal signal, uint8_t level) { - return espi_send_vwire(espi_dev, signal_to_zephyr_vwire(signal), level); + int ret = espi_send_vwire(espi_dev, signal_to_zephyr_vwire(signal), + level); + + if (ret != 0) + LOG_ERR("Encountered error sending virtual wire signal"); + + return ret; } int espi_vw_get_wire(enum espi_vw_signal signal) @@ -209,15 +221,125 @@ int espi_vw_disable_wire_int(enum espi_vw_signal signal) return 0; } -static uint8_t lpc_memmap[256] __aligned(8); - uint8_t *lpc_get_memmap_range(void) { - /* TODO(b/175217186): implement eSPI functions for host commands */ - return lpc_memmap; + uint32_t lpc_memmap = 0; + + if (espi_read_lpc_request(espi_dev, EACPI_GET_SHARED_MEMORY, + &lpc_memmap) != 0) { + LOG_ERR("Get lpc_memmap failed!\n"); + } + + return (uint8_t *)lpc_memmap; +} + +/** + * Update the level-sensitive wake signal to the AP. + * + * @param wake_events Currently asserted wake events + */ +static void lpc_update_wake(host_event_t wake_events) +{ + /* + * Mask off power button event, since the AP gets that through a + * separate dedicated GPIO. + */ + wake_events &= ~EC_HOST_EVENT_MASK(EC_HOST_EVENT_POWER_BUTTON); + + /* Signal is asserted low when wake events is non-zero */ + gpio_set_level(NAMED_GPIO(ec_pch_wake_odl), !wake_events); +} + +static void lpc_generate_smi(void) +{ + /* Enforce signal-high for long enough to debounce high */ + espi_vw_set_wire(VW_SMI_L, 1); + udelay(VWIRE_PULSE_TRIGGER_TIME); + espi_vw_set_wire(VW_SMI_L, 0); + udelay(VWIRE_PULSE_TRIGGER_TIME); + espi_vw_set_wire(VW_SMI_L, 1); +} + +static void lpc_generate_sci(void) +{ + /* Enforce signal-high for long enough to debounce high */ + espi_vw_set_wire(VW_SCI_L, 1); + udelay(VWIRE_PULSE_TRIGGER_TIME); + espi_vw_set_wire(VW_SCI_L, 0); + udelay(VWIRE_PULSE_TRIGGER_TIME); + espi_vw_set_wire(VW_SCI_L, 1); } void lpc_update_host_event_status(void) { - /* TODO(b/175217186): implement eSPI functions for host commands */ + uint32_t enable; + uint32_t status; + int need_sci = 0; + int need_smi = 0; + + if (!init_done) + return; + + /* Disable PMC1 interrupt while updating status register */ + enable = 0; + espi_write_lpc_request(espi_dev, ECUSTOM_HOST_SUBS_INTERRUPT_EN, + &enable); + + espi_read_lpc_request(espi_dev, EACPI_READ_STS, &status); + if (lpc_get_host_events_by_type(LPC_HOST_EVENT_SMI)) { + /* Only generate SMI for first event */ + if (!(status & EC_LPC_STATUS_SMI_PENDING)) + need_smi = 1; + + status |= EC_LPC_STATUS_SMI_PENDING; + espi_write_lpc_request(espi_dev, EACPI_WRITE_STS, &status); + } else { + status &= ~EC_LPC_STATUS_SMI_PENDING; + espi_write_lpc_request(espi_dev, EACPI_WRITE_STS, &status); + } + + espi_read_lpc_request(espi_dev, EACPI_READ_STS, &status); + if (lpc_get_host_events_by_type(LPC_HOST_EVENT_SCI)) { + /* Generate SCI for every event */ + need_sci = 1; + + status |= EC_LPC_STATUS_SCI_PENDING; + espi_write_lpc_request(espi_dev, EACPI_WRITE_STS, &status); + } else { + status &= ~EC_LPC_STATUS_SCI_PENDING; + espi_write_lpc_request(espi_dev, EACPI_WRITE_STS, &status); + } + + *(host_event_t *)host_get_memmap(EC_MEMMAP_HOST_EVENTS) = + lpc_get_host_events(); + + enable = 1; + espi_write_lpc_request(espi_dev, ECUSTOM_HOST_SUBS_INTERRUPT_EN, + &enable); + + /* Process the wake events. */ + lpc_update_wake(lpc_get_host_events_by_type(LPC_HOST_EVENT_WAKE)); + + /* Send pulse on SMI signal if needed */ + if (need_smi) + lpc_generate_smi(); + + /* ACPI 5.0-12.6.1: Generate SCI for SCI_EVT=1. */ + if (need_sci) + lpc_generate_sci(); } + +static void host_command_init(void) +{ + /* We support LPC args and version 3 protocol */ + *(lpc_get_memmap_range() + EC_MEMMAP_HOST_CMD_FLAGS) = + EC_HOST_CMD_FLAG_LPC_ARGS_SUPPORTED | + EC_HOST_CMD_FLAG_VERSION_3; + + /* Sufficiently initialized */ + init_done = 1; + + lpc_update_host_event_status(); +} + +DECLARE_HOOK(HOOK_INIT, host_command_init, HOOK_PRIO_INIT_LPC); |