diff options
| -rw-r--r-- | src/device/dram/Makefile.inc | 2 | ||||
| -rw-r--r-- | src/device/dram/ddr4.c | 78 | ||||
| -rw-r--r-- | src/include/device/dram/ddr4.h | 5 | ||||
| -rw-r--r-- | tests/device/Makefile.inc | 5 | ||||
| -rw-r--r-- | tests/device/ddr4-test.c | 41 |
5 files changed, 131 insertions, 0 deletions
diff --git a/src/device/dram/Makefile.inc b/src/device/dram/Makefile.inc index f397a534f2..f7118dbbc2 100644 --- a/src/device/dram/Makefile.inc +++ b/src/device/dram/Makefile.inc @@ -1 +1,3 @@ romstage-y += ddr4.c ddr3.c ddr2.c ddr_common.c + +ramstage-y += ddr4.c ddr3.c ddr2.c ddr_common.c diff --git a/src/device/dram/ddr4.c b/src/device/dram/ddr4.c index 429a9d271a..e670b20f72 100644 --- a/src/device/dram/ddr4.c +++ b/src/device/dram/ddr4.c @@ -9,6 +9,69 @@ #include <smbios.h> #include <types.h> +enum ddr4_speed_grade { + DDR4_1600, + DDR4_1866, + DDR4_2133, + DDR4_2400, + DDR4_2666, + DDR4_2933, + DDR4_3200 +}; + +struct ddr4_speed_attr { + uint32_t min_clock_mhz; // inclusive + uint32_t max_clock_mhz; // inclusive + uint32_t reported_mts; +}; + +/** + * DDR4 speed attributes derived from JEDEC 79-4C tables 169 & 170 + * + * min_clock_mhz = 1000/max_tCk_avg(ns) + 1 + * Adding 1 to make minimum inclusive + * max_clock_mhz = 1000/min_tCk_avg(ns) + * reported_mts = Standard reported DDR4 speed in MT/s + * May be 1 less than the actual max MT/s + */ +static const struct ddr4_speed_attr ddr4_speeds[] = { + [DDR4_1600] = { + .min_clock_mhz = 668, + .max_clock_mhz = 800, + .reported_mts = 1600 + }, + [DDR4_1866] = { + .min_clock_mhz = 801, + .max_clock_mhz = 934, + .reported_mts = 1866 + }, + [DDR4_2133] = { + .min_clock_mhz = 935, + .max_clock_mhz = 1067, + .reported_mts = 2133 + }, + [DDR4_2400] = { + .min_clock_mhz = 1068, + .max_clock_mhz = 1200, + .reported_mts = 2400 + }, + [DDR4_2666] = { + .min_clock_mhz = 1201, + .max_clock_mhz = 1333, + .reported_mts = 2666 + }, + [DDR4_2933] = { + .min_clock_mhz = 1334, + .max_clock_mhz = 1466, + .reported_mts = 2933 + }, + [DDR4_3200] = { + .min_clock_mhz = 1467, + .max_clock_mhz = 1600, + .reported_mts = 3200 + } +}; + typedef enum { BLOCK_0, /* Base Configuration and DRAM Parameters */ BLOCK_1, @@ -68,6 +131,21 @@ static bool block_exists(spd_block_type type, u8 dimm_type) } } +/** + * Converts DDR4 clock speed in MHz to the standard reported speed in MT/s + */ +uint16_t ddr4_speed_mhz_to_reported_mts(uint16_t speed_mhz) +{ + for (enum ddr4_speed_grade speed = 0; speed < ARRAY_SIZE(ddr4_speeds); speed++) { + const struct ddr4_speed_attr *speed_attr = &ddr4_speeds[speed]; + if (speed_mhz >= speed_attr->min_clock_mhz && + speed_mhz <= speed_attr->max_clock_mhz) { + return speed_attr->reported_mts; + } + } + printk(BIOS_ERR, "ERROR: DDR4 speed of %d MHz is out of range", speed_mhz); + return 0; +} /** * \brief Decode the raw SPD data diff --git a/src/include/device/dram/ddr4.h b/src/include/device/dram/ddr4.h index d22d4bc500..eac8bf8920 100644 --- a/src/include/device/dram/ddr4.h +++ b/src/include/device/dram/ddr4.h @@ -69,4 +69,9 @@ enum cb_err spd_add_smbios17_ddr4(const u8 channel, const u8 slot, const u16 selected_freq, const dimm_attr *info); +/** + * Converts DDR4 clock speed in MHz to the standard reported speed in MT/s + */ +uint16_t ddr4_speed_mhz_to_reported_mts(uint16_t speed_mhz); + #endif /* DEVICE_DRAM_DDR4L_H */ diff --git a/tests/device/Makefile.inc b/tests/device/Makefile.inc index 10223c52cc..4626c3cf3d 100644 --- a/tests/device/Makefile.inc +++ b/tests/device/Makefile.inc @@ -1,7 +1,12 @@ # SPDX-License-Identifier: GPL-2.0-only tests-y += i2c-test +tests-y += ddr4-test i2c-test-srcs += tests/device/i2c-test.c i2c-test-srcs += src/device/i2c.c i2c-test-mocks += platform_i2c_transfer + +ddr4-test-srcs += tests/device/ddr4-test.c +ddr4-test-srcs += tests/stubs/console.c +ddr4-test-srcs += src/device/dram/ddr4.c
\ No newline at end of file diff --git a/tests/device/ddr4-test.c b/tests/device/ddr4-test.c new file mode 100644 index 0000000000..0a9831da75 --- /dev/null +++ b/tests/device/ddr4-test.c @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <device/dram/ddr4.h> +#include <tests/test.h> + +static void ddr4_speed_mhz_to_mts_test(void **state) +{ + assert_int_equal(0, ddr4_speed_mhz_to_reported_mts(0)); + assert_int_equal(0, ddr4_speed_mhz_to_reported_mts(667)); + + assert_int_equal(1600, ddr4_speed_mhz_to_reported_mts(668)); + assert_int_equal(1600, ddr4_speed_mhz_to_reported_mts(800)); + + assert_int_equal(1866, ddr4_speed_mhz_to_reported_mts(801)); + assert_int_equal(1866, ddr4_speed_mhz_to_reported_mts(933)); + assert_int_equal(1866, ddr4_speed_mhz_to_reported_mts(934)); + + assert_int_equal(2133, ddr4_speed_mhz_to_reported_mts(1066)); + assert_int_equal(2133, ddr4_speed_mhz_to_reported_mts(1067)); + + assert_int_equal(2400, ddr4_speed_mhz_to_reported_mts(1200)); + + assert_int_equal(2666, ddr4_speed_mhz_to_reported_mts(1333)); + + assert_int_equal(2933, ddr4_speed_mhz_to_reported_mts(1466)); + + assert_int_equal(3200, ddr4_speed_mhz_to_reported_mts(1467)); + assert_int_equal(3200, ddr4_speed_mhz_to_reported_mts(1600)); + + assert_int_equal(0, ddr4_speed_mhz_to_reported_mts(1601)); + assert_int_equal(0, ddr4_speed_mhz_to_reported_mts(INT16_MAX)); +} + +int main(void) +{ + const struct CMUnitTest tests[] = { + cmocka_unit_test(ddr4_speed_mhz_to_mts_test) + }; + + return cmocka_run_group_tests(tests, NULL, NULL); +} |