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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EMIF programming
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*
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* (C) Copyright 2010
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* Texas Instruments, <www.ti.com>
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*
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* Aneesh V <aneesh@ti.com> for OMAP4
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*/
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#include <common.h>
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#include <log.h>
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#include <asm/emif.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/utils.h>
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#ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
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#define print_timing_reg(reg) debug(#reg" - 0x%08x\n", (reg))
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static u32 *const T_num = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_NUM;
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static u32 *const T_den = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_DEN;
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#endif
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#ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
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/* Base AC Timing values specified by JESD209-2 for 532MHz operation */
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static const struct lpddr2_ac_timings timings_jedec_532_mhz = {
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.max_freq = 532000000,
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.RL = 8,
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.tRPab = 21,
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.tRCD = 18,
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.tWR = 15,
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.tRASmin = 42,
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.tRRD = 10,
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.tWTRx2 = 15,
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.tXSR = 140,
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.tXPx2 = 15,
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.tRFCab = 130,
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.tRTPx2 = 15,
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.tCKE = 3,
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.tCKESR = 15,
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.tZQCS = 90,
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.tZQCL = 360,
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.tZQINIT = 1000,
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.tDQSCKMAXx2 = 11,
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.tRASmax = 70,
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.tFAW = 50
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};
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/*
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* Min tCK values specified by JESD209-2
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* Min tCK specifies the minimum duration of some AC timing parameters in terms
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* of the number of cycles. If the calculated number of cycles based on the
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* absolute time value is less than the min tCK value, min tCK value should
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* be used instead. This typically happens at low frequencies.
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*/
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static const struct lpddr2_min_tck min_tck_jedec = {
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.tRL = 3,
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.tRP_AB = 3,
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.tRCD = 3,
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.tWR = 3,
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.tRAS_MIN = 3,
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.tRRD = 2,
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.tWTR = 2,
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.tXP = 2,
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.tRTP = 2,
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.tCKE = 3,
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.tCKESR = 3,
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.tFAW = 8
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};
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static const struct lpddr2_ac_timings const*
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jedec_ac_timings[MAX_NUM_SPEEDBINS] = {
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&timings_jedec_532_mhz
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};
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static const struct lpddr2_device_timings jedec_default_timings = {
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.ac_timings = jedec_ac_timings,
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.min_tck = &min_tck_jedec
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};
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void emif_get_device_timings(u32 emif_nr,
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const struct lpddr2_device_timings **cs0_device_timings,
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const struct lpddr2_device_timings **cs1_device_timings)
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{
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/* Assume Identical devices on EMIF1 & EMIF2 */
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*cs0_device_timings = &jedec_default_timings;
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*cs1_device_timings = NULL;
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}
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#endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */
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