diff options
| -rw-r--r-- | hw/centaur.c | 59 | ||||
| -rw-r--r-- | include/centaur.h | 4 |
2 files changed, 63 insertions, 0 deletions
diff --git a/hw/centaur.c b/hw/centaur.c index 6504e92..24d2836 100644 --- a/hw/centaur.c +++ b/hw/centaur.c @@ -21,6 +21,7 @@ #include <centaur.h> #include <lock.h> #include <fsi-master.h> +#include <timebase.h> /* * Centaur chip IDs are using the XSCOM "partID" encoding @@ -52,6 +53,12 @@ #define FSI_STATUS_ABORT 0x00100000 #define FSI_STATUS_ERRORS 0x00007000 +/* Some Centaur XSCOMs we care about */ +#define SCAC_CONFIG_REG 0x020115ce +#define SCAC_CONFIG_SET 0x020115cf +#define SCAC_CONFIG_CLR 0x020115d0 +#define SCAC_ENABLE_MSK PPC_BIT(0) + static int64_t centaur_fsiscom_complete(struct centaur_chip *centaur) { int64_t rc; @@ -296,6 +303,58 @@ static bool centaur_add(uint32_t part_id, uint32_t mchip, uint32_t meng, return true; } +/* Returns how long to wait for logic to stop in TB ticks or a negative + * value on error + */ +int64_t centaur_disable_sensor_cache(uint32_t part_id) +{ + struct centaur_chip *centaur = get_centaur(part_id); + int64_t rc = 0; + uint64_t ctrl; + + if (!centaur) + return false; + + lock(¢aur->lock); + centaur->scache_disable_count++; + if (centaur->scache_disable_count == 1) { + centaur->scache_was_enabled = false; + rc = centaur_fsiscom_read(centaur, SCAC_CONFIG_REG, &ctrl); + if (rc) + goto bail; + centaur->scache_was_enabled = !!(ctrl & SCAC_ENABLE_MSK); + rc = centaur_fsiscom_write(centaur, SCAC_CONFIG_CLR, SCAC_ENABLE_MSK); + if (rc) + goto bail; + rc = msecs_to_tb(30); + } + bail: + unlock(¢aur->lock); + return rc; +} + +int64_t centaur_enable_sensor_cache(uint32_t part_id) +{ + struct centaur_chip *centaur = get_centaur(part_id); + int64_t rc = 0; + + if (!centaur) + return false; + + lock(¢aur->lock); + if (centaur->scache_disable_count == 0) { + prerror("CENTAUR: Cache count going negative !\n"); + backtrace(); + goto bail; + } + centaur->scache_disable_count--; + if (centaur->scache_disable_count == 0 && centaur->scache_was_enabled) + rc = centaur_fsiscom_write(centaur, SCAC_CONFIG_SET, SCAC_ENABLE_MSK); + bail: + unlock(¢aur->lock); + return rc; +} + void centaur_init(void) { struct dt_node *cn; diff --git a/include/centaur.h b/include/centaur.h index 457afd7..5412475 100644 --- a/include/centaur.h +++ b/include/centaur.h @@ -28,9 +28,13 @@ struct centaur_chip { uint32_t fsi_master_chip_id; uint32_t fsi_master_port; uint32_t fsi_master_engine; + uint32_t scache_disable_count; + bool scache_was_enabled; struct lock lock; }; +extern int64_t centaur_disable_sensor_cache(uint32_t part_id); +extern int64_t centaur_enable_sensor_cache(uint32_t part_id); extern int64_t centaur_xscom_read(uint32_t id, uint64_t pcb_addr, uint64_t *val) __warn_unused_result; extern int64_t centaur_xscom_write(uint32_t id, uint64_t pcb_addr, uint64_t val) __warn_unused_result; |