diff options
Diffstat (limited to 'arch/arm/boards/ls1046ardb/lowlevel.c')
| -rw-r--r-- | arch/arm/boards/ls1046ardb/lowlevel.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/arch/arm/boards/ls1046ardb/lowlevel.c b/arch/arm/boards/ls1046ardb/lowlevel.c new file mode 100644 index 0000000000..6de16063a7 --- /dev/null +++ b/arch/arm/boards/ls1046ardb/lowlevel.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <common.h> +#include <debug_ll.h> +#include <ddr_spd.h> +#include <platform_data/mmc-esdhc-imx.h> +#include <i2c/i2c-early.h> +#include <soc/fsl/fsl_ddr_sdram.h> +#include <soc/fsl/immap_lsch2.h> +#include <asm/barebox-arm-head.h> +#include <asm/barebox-arm.h> +#include <asm/syscounter.h> +#include <asm/cache.h> +#include <mach/errata.h> +#include <mach/lowlevel.h> +#include <mach/xload.h> +#include <mach/layerscape.h> + +struct board_specific_parameters { + u32 n_ranks; + u32 datarate_mhz_high; + u32 rank_gb; + u32 clk_adjust; + u32 wrlvl_start; + u32 wrlvl_ctl_2; + u32 wrlvl_ctl_3; +}; + +/* + * These tables contain all valid speeds we want to override with board + * specific parameters. datarate_mhz_high values need to be in ascending order + * for each n_ranks group. + */ +static const struct board_specific_parameters udimm0[] = { + /* + * memory controller 0 + * num| hi| rank| clk| wrlvl | wrlvl | wrlvl + * ranks| mhz| GB |adjst| start | ctl2 | ctl3 + */ + {2, 1350, 0, 8, 6, 0x0708090B, 0x0C0D0E09,}, + {2, 1666, 0, 8, 7, 0x08090A0C, 0x0D0F100B,}, + {2, 1900, 0, 8, 7, 0x09090B0D, 0x0E10120B,}, + {2, 2300, 0, 8, 9, 0x0A0B0C10, 0x1213140E,}, + {} +}; + +static const struct board_specific_parameters *udimms[] = { + udimm0, +}; + +static const struct board_specific_parameters rdimm0[] = { + /* + * memory controller 0 + * num| hi| rank| clk| wrlvl | wrlvl | wrlvl + * ranks| mhz| GB |adjst| start | ctl2 | ctl3 + */ + {2, 1666, 0, 0x8, 0x0D, 0x0C0B0A08, 0x0A0B0C08,}, + {2, 1900, 0, 0x8, 0x0E, 0x0D0C0B09, 0x0B0C0D09,}, + {2, 2300, 0, 0xa, 0x12, 0x100F0D0C, 0x0E0F100C,}, + {1, 1666, 0, 0x8, 0x0D, 0x0C0B0A08, 0x0A0B0C08,}, + {1, 1900, 0, 0x8, 0x0E, 0x0D0C0B09, 0x0B0C0D09,}, + {1, 2300, 0, 0xa, 0x12, 0x100F0D0C, 0x0E0F100C,}, + {} +}; + +static const struct board_specific_parameters *rdimms[] = { + rdimm0, +}; + +static void ddr_board_options(memctl_options_t *popts, + struct dimm_params *pdimm, + struct fsl_ddr_controller *c) +{ + const struct board_specific_parameters *pbsp, *pbsp_highest = NULL; + unsigned long ddr_freq; + + if (!pdimm->n_ranks) + return; + + if (popts->registered_dimm_en) + pbsp = rdimms[0]; + else + pbsp = udimms[0]; + + /* Get clk_adjust, wrlvl_start, wrlvl_ctl, according to the board ddr + * freqency and n_banks specified in board_specific_parameters table. + */ + ddr_freq = c->ddr_freq / 1000000; + while (pbsp->datarate_mhz_high) { + if (pbsp->n_ranks == pdimm->n_ranks) { + if (ddr_freq <= pbsp->datarate_mhz_high) { + popts->clk_adjust = pbsp->clk_adjust; + popts->wrlvl_start = pbsp->wrlvl_start; + popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; + popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; + goto found; + } + pbsp_highest = pbsp; + } + pbsp++; + } + + if (pbsp_highest) { + printf("Error: board specific timing not found for %lu MT/s\n", + ddr_freq); + printf("Trying to use the highest speed (%u) parameters\n", + pbsp_highest->datarate_mhz_high); + popts->clk_adjust = pbsp_highest->clk_adjust; + popts->wrlvl_start = pbsp_highest->wrlvl_start; + popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; + popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; + } else { + panic("DIMM is not supported by this board"); + } +found: + debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n", + pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb); + + popts->data_bus_width = 0; /* 64-bit data bus */ + popts->bstopre = 0; /* enable auto precharge */ + + /* + * Factors to consider for half-strength driver enable: + * - number of DIMMs installed + */ + popts->half_strength_driver_enable = 0; + /* + * Write leveling override + */ + popts->wrlvl_override = 1; + popts->wrlvl_sample = 0xf; + + /* + * Rtt and Rtt_WR override + */ + popts->rtt_override = 0; + + /* Enable ZQ calibration */ + popts->zq_en = 1; + + popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR4_CDR_ODT_80ohm); + popts->ddr_cdr2 = DDR_CDR2_ODT(DDR4_CDR_ODT_80ohm) | + DDR_CDR2_VREF_TRAIN_EN | DDR_CDR2_VREF_RANGE_2; + + /* optimize cpo for erratum A-009942 */ + popts->cpo_sample = 0x61; +} + +extern char __dtb_fsl_ls1046a_rdb_start[]; + +static struct spd_eeprom spd_eeprom[] = { + { + /* filled during runtime */ + }, +}; + +static struct dimm_params dimm_params[] = { + { + /* filled during runtime */ + }, +}; + +static struct fsl_ddr_controller ddrc[] = { + { + .dimm_slots_per_ctrl = ARRAY_SIZE(dimm_params), + .spd_installed_dimms = spd_eeprom, + .dimm_params = dimm_params, + .memctl_opts.ddrtype = SDRAM_TYPE_DDR4, + .base = IOMEM(LSCH2_DDR_ADDR), + .ddr_freq = LS1046A_DDR_FREQ, + .erratum_A008511 = 1, + .erratum_A009803 = 1, + .erratum_A010165 = 1, + .erratum_A009801 = 1, + .erratum_A009942 = 1, + .chip_selects_per_ctrl = 4, + .board_options = ddr_board_options, + }, +}; + +static struct fsl_ddr_info ls1046a_info = { + .num_ctrls = ARRAY_SIZE(ddrc), + .c = ddrc, +}; + +static noinline __noreturn void ls1046ardb_r_entry(unsigned long memsize) +{ + unsigned long membase = LS1046A_DDR_SDRAM_BASE; + struct fsl_i2c *i2c; + int ret; + + if (get_pc() >= membase) { + if (memsize + membase >= 0x100000000) + memsize = 0x100000000 - membase; + + barebox_arm_entry(membase, 0x80000000 - SZ_1M * 67, + __dtb_fsl_ls1046a_rdb_start); + } + + arm_cpu_lowlevel_init(); + debug_ll_init(); + ls1046a_init_lowlevel(); + + i2c = ls1046_i2c_init(IOMEM(LSCH2_I2C1_BASE_ADDR)); + ret = spd_read_eeprom(i2c, i2c_fsl_xfer, 0x51, &spd_eeprom); + if (ret) { + pr_err("Cannot read SPD EEPROM: %d\n", ret); + goto err; + } + + memsize = fsl_ddr_sdram(&ls1046a_info); + + ls1046a_errata_post_ddr(); + + ls1046a_esdhc_start_image(memsize, 0, 0); + +err: + pr_err("Booting failed\n"); + + while (1); +} + +void ls1046ardb_entry(unsigned long r0, unsigned long r1, unsigned long r2); + +__noreturn void ls1046ardb_entry(unsigned long r0, unsigned long r1, unsigned long r2) +{ + relocate_to_current_adr(); + setup_c(); + + ls1046ardb_r_entry(r0); +} |