diff options
Diffstat (limited to 'drivers/ddr/marvell/a38x/mv_ddr_spd.c')
| -rw-r--r-- | drivers/ddr/marvell/a38x/mv_ddr_spd.c | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/drivers/ddr/marvell/a38x/mv_ddr_spd.c b/drivers/ddr/marvell/a38x/mv_ddr_spd.c new file mode 100644 index 0000000000..e9e7f18098 --- /dev/null +++ b/drivers/ddr/marvell/a38x/mv_ddr_spd.c @@ -0,0 +1,377 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) Marvell International Ltd. and its affiliates + */ + +#include "mv_ddr_spd.h" + +#define MV_DDR_SPD_DATA_MTB 125 /* medium timebase, ps */ +#define MV_DDR_SPD_DATA_FTB 1 /* fine timebase, ps */ +#define MV_DDR_SPD_MSB_OFFS 8 /* most significant byte offset, bits */ + +#define MV_DDR_SPD_SUPPORTED_CLS_NUM 30 + +static unsigned int mv_ddr_spd_supported_cls[MV_DDR_SPD_SUPPORTED_CLS_NUM]; + +int mv_ddr_spd_supported_cls_calc(union mv_ddr_spd_data *spd_data) +{ + unsigned int byte, bit, start_cl; + + start_cl = (spd_data->all_bytes[23] & 0x8) ? 23 : 7; + + for (byte = 20; byte < 23; byte++) { + for (bit = 0; bit < 8; bit++) { + if (spd_data->all_bytes[byte] & (1 << bit)) + mv_ddr_spd_supported_cls[(byte - 20) * 8 + bit] = start_cl + (byte - 20) * 8 + bit; + else + mv_ddr_spd_supported_cls[(byte - 20) * 8 + bit] = 0; + } + } + + for (byte = 23, bit = 0; bit < 6; bit++) { + if (spd_data->all_bytes[byte] & (1 << bit)) + mv_ddr_spd_supported_cls[(byte - 20) * 8 + bit] = start_cl + (byte - 20) * 8 + bit; + else + mv_ddr_spd_supported_cls[(byte - 20) * 8 + bit] = 0; + } + + return 0; +} + +unsigned int mv_ddr_spd_supported_cl_get(unsigned int cl) +{ + unsigned int supported_cl; + int i = 0; + + while (i < MV_DDR_SPD_SUPPORTED_CLS_NUM && + mv_ddr_spd_supported_cls[i] < cl) + i++; + + if (i < MV_DDR_SPD_SUPPORTED_CLS_NUM) + supported_cl = mv_ddr_spd_supported_cls[i]; + else + supported_cl = 0; + + return supported_cl; +} + +int mv_ddr_spd_timing_calc(union mv_ddr_spd_data *spd_data, unsigned int timing_data[]) +{ + int calc_val; + + /* t ck avg min, ps */ + calc_val = spd_data->byte_fields.byte_18 * MV_DDR_SPD_DATA_MTB + + (signed char)spd_data->byte_fields.byte_125 * MV_DDR_SPD_DATA_FTB; + if (calc_val < 0) + return 1; + timing_data[MV_DDR_TCK_AVG_MIN] = calc_val; + + /* t aa min, ps */ + calc_val = spd_data->byte_fields.byte_24 * MV_DDR_SPD_DATA_MTB + + (signed char)spd_data->byte_fields.byte_123 * MV_DDR_SPD_DATA_FTB; + if (calc_val < 0) + return 1; + timing_data[MV_DDR_TAA_MIN] = calc_val; + + /* t rfc1 min, ps */ + timing_data[MV_DDR_TRFC1_MIN] = (spd_data->byte_fields.byte_30 + + (spd_data->byte_fields.byte_31 << MV_DDR_SPD_MSB_OFFS)) * MV_DDR_SPD_DATA_MTB; + + /* t wr min, ps */ + timing_data[MV_DDR_TWR_MIN] = (spd_data->byte_fields.byte_42 + + (spd_data->byte_fields.byte_41.bit_fields.t_wr_min_msn << MV_DDR_SPD_MSB_OFFS)) * + MV_DDR_SPD_DATA_MTB; + /* FIXME: wa: set twr to a default value, if it's unset on spd */ + if (timing_data[MV_DDR_TWR_MIN] == 0) + timing_data[MV_DDR_TWR_MIN] = 15000; + + /* t rcd min, ps */ + calc_val = spd_data->byte_fields.byte_25 * MV_DDR_SPD_DATA_MTB + + (signed char)spd_data->byte_fields.byte_122 * MV_DDR_SPD_DATA_FTB; + if (calc_val < 0) + return 1; + timing_data[MV_DDR_TRCD_MIN] = calc_val; + + /* t rp min, ps */ + calc_val = spd_data->byte_fields.byte_26 * MV_DDR_SPD_DATA_MTB + + (signed char)spd_data->byte_fields.byte_121 * MV_DDR_SPD_DATA_FTB; + if (calc_val < 0) + return 1; + timing_data[MV_DDR_TRP_MIN] = calc_val; + + /* t rc min, ps */ + calc_val = (spd_data->byte_fields.byte_29 + + (spd_data->byte_fields.byte_27.bit_fields.t_rc_min_msn << MV_DDR_SPD_MSB_OFFS)) * + MV_DDR_SPD_DATA_MTB + + (signed char)spd_data->byte_fields.byte_120 * MV_DDR_SPD_DATA_FTB; + if (calc_val < 0) + return 1; + timing_data[MV_DDR_TRC_MIN] = calc_val; + + /* t ras min, ps */ + timing_data[MV_DDR_TRAS_MIN] = (spd_data->byte_fields.byte_28 + + (spd_data->byte_fields.byte_27.bit_fields.t_ras_min_msn << MV_DDR_SPD_MSB_OFFS)) * + MV_DDR_SPD_DATA_MTB; + + /* t rrd s min, ps */ + calc_val = spd_data->byte_fields.byte_38 * MV_DDR_SPD_DATA_MTB + + (signed char)spd_data->byte_fields.byte_119 * MV_DDR_SPD_DATA_FTB; + if (calc_val < 0) + return 1; + timing_data[MV_DDR_TRRD_S_MIN] = calc_val; + + /* t rrd l min, ps */ + calc_val = spd_data->byte_fields.byte_39 * MV_DDR_SPD_DATA_MTB + + (signed char)spd_data->byte_fields.byte_118 * MV_DDR_SPD_DATA_FTB; + if (calc_val < 0) + return 1; + timing_data[MV_DDR_TRRD_L_MIN] = calc_val; + + /* t faw min, ps */ + timing_data[MV_DDR_TFAW_MIN] = (spd_data->byte_fields.byte_37 + + (spd_data->byte_fields.byte_36.bit_fields.t_faw_min_msn << MV_DDR_SPD_MSB_OFFS)) * + MV_DDR_SPD_DATA_MTB; + + /* t wtr s min, ps */ + timing_data[MV_DDR_TWTR_S_MIN] = (spd_data->byte_fields.byte_44 + + (spd_data->byte_fields.byte_43.bit_fields.t_wtr_s_min_msn << MV_DDR_SPD_MSB_OFFS)) * + MV_DDR_SPD_DATA_MTB; + /* FIXME: wa: set twtr_s to a default value, if it's unset on spd */ + if (timing_data[MV_DDR_TWTR_S_MIN] == 0) + timing_data[MV_DDR_TWTR_S_MIN] = 2500; + + /* t wtr l min, ps */ + timing_data[MV_DDR_TWTR_L_MIN] = (spd_data->byte_fields.byte_45 + + (spd_data->byte_fields.byte_43.bit_fields.t_wtr_l_min_msn << MV_DDR_SPD_MSB_OFFS)) * + MV_DDR_SPD_DATA_MTB; + /* FIXME: wa: set twtr_l to a default value, if it's unset on spd */ + if (timing_data[MV_DDR_TWTR_L_MIN] == 0) + timing_data[MV_DDR_TWTR_L_MIN] = 7500; + + return 0; +} + +enum mv_ddr_dev_width mv_ddr_spd_dev_width_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char dev_width = spd_data->byte_fields.byte_12.bit_fields.device_width; + enum mv_ddr_dev_width ret_val; + + switch (dev_width) { + case 0x00: + ret_val = MV_DDR_DEV_WIDTH_4BIT; + break; + case 0x01: + ret_val = MV_DDR_DEV_WIDTH_8BIT; + break; + case 0x02: + ret_val = MV_DDR_DEV_WIDTH_16BIT; + break; + case 0x03: + ret_val = MV_DDR_DEV_WIDTH_32BIT; + break; + default: + ret_val = MV_DDR_DEV_WIDTH_LAST; + } + + return ret_val; +} + +enum mv_ddr_die_capacity mv_ddr_spd_die_capacity_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char die_cap = spd_data->byte_fields.byte_4.bit_fields.die_capacity; + enum mv_ddr_die_capacity ret_val; + + switch (die_cap) { + case 0x00: + ret_val = MV_DDR_DIE_CAP_256MBIT; + break; + case 0x01: + ret_val = MV_DDR_DIE_CAP_512MBIT; + break; + case 0x02: + ret_val = MV_DDR_DIE_CAP_1GBIT; + break; + case 0x03: + ret_val = MV_DDR_DIE_CAP_2GBIT; + break; + case 0x04: + ret_val = MV_DDR_DIE_CAP_4GBIT; + break; + case 0x05: + ret_val = MV_DDR_DIE_CAP_8GBIT; + break; + case 0x06: + ret_val = MV_DDR_DIE_CAP_16GBIT; + break; + case 0x07: + ret_val = MV_DDR_DIE_CAP_32GBIT; + break; + case 0x08: + ret_val = MV_DDR_DIE_CAP_12GBIT; + break; + case 0x09: + ret_val = MV_DDR_DIE_CAP_24GBIT; + break; + default: + ret_val = MV_DDR_DIE_CAP_LAST; + } + + return ret_val; +} + +unsigned char mv_ddr_spd_mem_mirror_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char mem_mirror = spd_data->byte_fields.byte_131.bit_fields.rank_1_mapping; + + return mem_mirror; +} + +enum mv_ddr_pkg_rank mv_ddr_spd_pri_bus_width_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char pri_bus_width = spd_data->byte_fields.byte_13.bit_fields.primary_bus_width; + enum mv_ddr_pri_bus_width ret_val; + + switch (pri_bus_width) { + case 0x00: + ret_val = MV_DDR_PRI_BUS_WIDTH_8; + break; + case 0x01: + ret_val = MV_DDR_PRI_BUS_WIDTH_16; + break; + case 0x02: + ret_val = MV_DDR_PRI_BUS_WIDTH_32; + break; + case 0x03: + ret_val = MV_DDR_PRI_BUS_WIDTH_64; + break; + default: + ret_val = MV_DDR_PRI_BUS_WIDTH_LAST; + } + + return ret_val; +} + +enum mv_ddr_pkg_rank mv_ddr_spd_bus_width_ext_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char bus_width_ext = spd_data->byte_fields.byte_13.bit_fields.bus_width_ext; + enum mv_ddr_bus_width_ext ret_val; + + switch (bus_width_ext) { + case 0x00: + ret_val = MV_DDR_BUS_WIDTH_EXT_0; + break; + case 0x01: + ret_val = MV_DDR_BUS_WIDTH_EXT_8; + break; + default: + ret_val = MV_DDR_BUS_WIDTH_EXT_LAST; + } + + return ret_val; +} + +static enum mv_ddr_pkg_rank mv_ddr_spd_pkg_rank_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char pkg_rank = spd_data->byte_fields.byte_12.bit_fields.dimm_pkg_ranks_num; + enum mv_ddr_pkg_rank ret_val; + + switch (pkg_rank) { + case 0x00: + ret_val = MV_DDR_PKG_RANK_1; + break; + case 0x01: + ret_val = MV_DDR_PKG_RANK_2; + break; + case 0x02: + ret_val = MV_DDR_PKG_RANK_3; + break; + case 0x03: + ret_val = MV_DDR_PKG_RANK_4; + break; + case 0x04: + ret_val = MV_DDR_PKG_RANK_5; + break; + case 0x05: + ret_val = MV_DDR_PKG_RANK_6; + break; + case 0x06: + ret_val = MV_DDR_PKG_RANK_7; + break; + case 0x07: + ret_val = MV_DDR_PKG_RANK_8; + break; + default: + ret_val = MV_DDR_PKG_RANK_LAST; + } + + return ret_val; +} + +static enum mv_ddr_die_count mv_ddr_spd_die_count_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char die_count = spd_data->byte_fields.byte_6.bit_fields.die_count; + enum mv_ddr_die_count ret_val; + + switch (die_count) { + case 0x00: + ret_val = MV_DDR_DIE_CNT_1; + break; + case 0x01: + ret_val = MV_DDR_DIE_CNT_2; + break; + case 0x02: + ret_val = MV_DDR_DIE_CNT_3; + break; + case 0x03: + ret_val = MV_DDR_DIE_CNT_4; + break; + case 0x04: + ret_val = MV_DDR_DIE_CNT_5; + break; + case 0x05: + ret_val = MV_DDR_DIE_CNT_6; + break; + case 0x06: + ret_val = MV_DDR_DIE_CNT_7; + break; + case 0x07: + ret_val = MV_DDR_DIE_CNT_8; + break; + default: + ret_val = MV_DDR_DIE_CNT_LAST; + } + + return ret_val; +} + +unsigned char mv_ddr_spd_cs_bit_mask_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char cs_bit_mask = 0x0; + enum mv_ddr_pkg_rank pkg_rank = mv_ddr_spd_pkg_rank_get(spd_data); + enum mv_ddr_die_count die_cnt = mv_ddr_spd_die_count_get(spd_data); + + if (pkg_rank == MV_DDR_PKG_RANK_1 && die_cnt == MV_DDR_DIE_CNT_1) + cs_bit_mask = 0x1; + else if (pkg_rank == MV_DDR_PKG_RANK_1 && die_cnt == MV_DDR_DIE_CNT_2) + cs_bit_mask = 0x3; + else if (pkg_rank == MV_DDR_PKG_RANK_2 && die_cnt == MV_DDR_DIE_CNT_1) + cs_bit_mask = 0x3; + else if (pkg_rank == MV_DDR_PKG_RANK_2 && die_cnt == MV_DDR_DIE_CNT_2) + cs_bit_mask = 0xf; + + return cs_bit_mask; +} + +unsigned char mv_ddr_spd_dev_type_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char dev_type = spd_data->byte_fields.byte_2; + + return dev_type; +} + +unsigned char mv_ddr_spd_module_type_get(union mv_ddr_spd_data *spd_data) +{ + unsigned char module_type = spd_data->byte_fields.byte_3.bit_fields.module_type; + + return module_type; +} |