diff options
Diffstat (limited to 'src/soc/intel/common/lpss_i2c.c')
| -rw-r--r-- | src/soc/intel/common/lpss_i2c.c | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/src/soc/intel/common/lpss_i2c.c b/src/soc/intel/common/lpss_i2c.c index bb684e2f35..a9bbbb32a7 100644 --- a/src/soc/intel/common/lpss_i2c.c +++ b/src/soc/intel/common/lpss_i2c.c @@ -20,6 +20,7 @@ #include <console/console.h> #include <device/device.h> #include <device/i2c.h> +#include <string.h> #include <timer.h> #include "lpss_i2c.h" @@ -305,7 +306,17 @@ int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count) return 0; } -void lpss_i2c_acpi_write_speed_config( +/* + * Write ACPI object to describe speed configuration. + * + * ACPI Object: Name ("xxxx", Package () { scl_lcnt, scl_hcnt, sda_hold } + * + * SSCN: I2C_SPEED_STANDARD + * FMCN: I2C_SPEED_FAST + * FPCN: I2C_SPEED_FAST_PLUS + * HSCN: I2C_SPEED_HIGH + */ +static void lpss_i2c_acpi_write_speed_config( const struct lpss_i2c_speed_config *config) { if (!config) @@ -330,6 +341,37 @@ void lpss_i2c_acpi_write_speed_config( acpigen_pop_len(); } +void lpss_i2c_acpi_fill_ssdt(const struct lpss_i2c_speed_config *override) +{ + const struct lpss_i2c_speed_config *sptr; + struct lpss_i2c_speed_config sgen; + enum i2c_speed speeds[LPSS_I2C_SPEED_CONFIG_COUNT] = { + I2C_SPEED_STANDARD, + I2C_SPEED_FAST, + I2C_SPEED_FAST_PLUS, + I2C_SPEED_HIGH, + }; + int i; + + /* Report timing values for the OS driver */ + for (i = 0; i < LPSS_I2C_SPEED_CONFIG_COUNT; i++) { + /* Generate speed config for default case */ + if (lpss_i2c_gen_speed_config(speeds[i], &sgen) < 0) + continue; + + /* Apply board specific override for this speed if found */ + for (sptr = override; sptr && sptr->speed; sptr++) { + if (sptr->speed == speeds[i]) { + memcpy(&sgen, sptr, sizeof(sgen)); + break; + } + } + + /* Generate ACPI based on selected speed config */ + lpss_i2c_acpi_write_speed_config(&sgen); + } +} + int lpss_i2c_set_speed_config(unsigned bus, const struct lpss_i2c_speed_config *config) { |