/* SPDX-License-Identifier: GPL-2.0-only */ #include <console/console.h> #include <device/device.h> #include <device/dram/lpddr4.h> #include <memory_info.h> #include <smbios.h> #include <types.h> enum lpddr4_speed_grade { LPDDR4_1333, LPDDR4_1600, LPDDR4_1866, LPDDR4_2133, LPDDR4_2400, LPDDR4_2666, LPDDR4_3200, LPDDR4_3733, LPDDR4_4266, }; struct lpddr4_speed_attr { uint32_t min_clock_mhz; // inclusive uint32_t max_clock_mhz; // inclusive uint32_t reported_mts; }; /** * LPDDR4 speed attributes derived from JEDEC 209-4C and industry norms * * min_clock_mhz = Previous max_clock_mhz + 1 * max_clock_mhz = 1000/min_tCk_avg(ns) * reported_mts = Standard reported DDR4 speed in MT/s * May be slightly less than the actual max MT/s */ static const struct lpddr4_speed_attr lpddr4_speeds[] = { [LPDDR4_1333] = { .min_clock_mhz = 10, .max_clock_mhz = 667, .reported_mts = 1333, }, [LPDDR4_1600] = { .min_clock_mhz = 668, .max_clock_mhz = 800, .reported_mts = 1600 }, [LPDDR4_1866] = { .min_clock_mhz = 801, .max_clock_mhz = 934, .reported_mts = 1866, }, [LPDDR4_2133] = { .min_clock_mhz = 935, .max_clock_mhz = 1067, .reported_mts = 2133 }, [LPDDR4_2400] = { .min_clock_mhz = 1068, .max_clock_mhz = 1200, .reported_mts = 2400 }, [LPDDR4_2666] = { .min_clock_mhz = 1201, .max_clock_mhz = 1333, .reported_mts = 2666 }, [LPDDR4_3200] = { .min_clock_mhz = 1334, .max_clock_mhz = 1600, .reported_mts = 3200 }, [LPDDR4_3733] = { .min_clock_mhz = 1601, .max_clock_mhz = 1867, .reported_mts = 3733 }, [LPDDR4_4266] = { .min_clock_mhz = 1868, .max_clock_mhz = 2134, .reported_mts = 4266 }, }; /** * Converts LPDDR4 clock speed in MHz to the standard reported speed in MT/s */ uint16_t lpddr4_speed_mhz_to_reported_mts(uint16_t speed_mhz) { for (enum lpddr4_speed_grade speed = 0; speed < ARRAY_SIZE(lpddr4_speeds); speed++) { const struct lpddr4_speed_attr *speed_attr = &lpddr4_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, "LPDDR4 speed of %d MHz is out of range\n", speed_mhz); return 0; }