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gerrit.cesnet.cz / github / trini / u-boot / d4c746c7b1f802685f75fa531a88104b19861a8c / . / arch / arm / mach-omap2 / omap4 / emif.c
blob: 403c3c6146e46fbfb01da9a7da495bbb985cafdb [file] [log] [blame]
Sricharanbb772a52011-11-15 09:50:00 -0500[diff] [blame]1/*
2 * EMIF programming
3 *
4 * (C) Copyright 2010
5 * Texas Instruments, <www.ti.com>
6 *
7 * Aneesh V <aneesh@ti.com>
8 *
Wolfgang Denk1a459662013-07-08 09:37:19 +0200[diff] [blame]9 * SPDX-License-Identifier: GPL-2.0+
Sricharanbb772a52011-11-15 09:50:00 -0500[diff] [blame]10 */
11
12#include <common.h>
13#include <asm/emif.h>
14#include <asm/arch/sys_proto.h>
15#include <asm/utils.h>
16
17#ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
SRICHARAN Rf92f2272013-04-24 00:41:22 +0000[diff] [blame]18u32 *const T_num = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_NUM;
19u32 *const T_den = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_DEN;
Sricharanbb772a52011-11-15 09:50:00 -0500[diff] [blame]20#endif
21
22#ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
23/* Base AC Timing values specified by JESD209-2 for 400MHz operation */
24static const struct lpddr2_ac_timings timings_jedec_400_mhz = {
25 .max_freq = 400000000,
26 .RL = 6,
27 .tRPab = 21,
28 .tRCD = 18,
29 .tWR = 15,
30 .tRASmin = 42,
31 .tRRD = 10,
32 .tWTRx2 = 15,
33 .tXSR = 140,
34 .tXPx2 = 15,
35 .tRFCab = 130,
36 .tRTPx2 = 15,
37 .tCKE = 3,
38 .tCKESR = 15,
39 .tZQCS = 90,
40 .tZQCL = 360,
41 .tZQINIT = 1000,
42 .tDQSCKMAXx2 = 11,
43 .tRASmax = 70,
44 .tFAW = 50
45};
46
47/* Base AC Timing values specified by JESD209-2 for 200 MHz operation */
48static const struct lpddr2_ac_timings timings_jedec_200_mhz = {
49 .max_freq = 200000000,
50 .RL = 3,
51 .tRPab = 21,
52 .tRCD = 18,
53 .tWR = 15,
54 .tRASmin = 42,
55 .tRRD = 10,
56 .tWTRx2 = 20,
57 .tXSR = 140,
58 .tXPx2 = 15,
59 .tRFCab = 130,
60 .tRTPx2 = 15,
61 .tCKE = 3,
62 .tCKESR = 15,
63 .tZQCS = 90,
64 .tZQCL = 360,
65 .tZQINIT = 1000,
66 .tDQSCKMAXx2 = 11,
67 .tRASmax = 70,
68 .tFAW = 50
69};
70
71/*
72 * Min tCK values specified by JESD209-2
73 * Min tCK specifies the minimum duration of some AC timing parameters in terms
74 * of the number of cycles. If the calculated number of cycles based on the
75 * absolute time value is less than the min tCK value, min tCK value should
76 * be used instead. This typically happens at low frequencies.
77 */
78static const struct lpddr2_min_tck min_tck_jedec = {
79 .tRL = 3,
80 .tRP_AB = 3,
81 .tRCD = 3,
82 .tWR = 3,
83 .tRAS_MIN = 3,
84 .tRRD = 2,
85 .tWTR = 2,
86 .tXP = 2,
87 .tRTP = 2,
88 .tCKE = 3,
89 .tCKESR = 3,
90 .tFAW = 8
91};
92
93static const struct lpddr2_ac_timings const*
94 jedec_ac_timings[MAX_NUM_SPEEDBINS] = {
95 &timings_jedec_200_mhz,
96 &timings_jedec_400_mhz
97};
98
Paul Kocialkowskied5ddeb2016-02-27 19:18:55 +0100[diff] [blame]99const struct lpddr2_device_timings jedec_default_timings = {
Sricharanbb772a52011-11-15 09:50:00 -0500[diff] [blame]100 .ac_timings = jedec_ac_timings,
101 .min_tck = &min_tck_jedec
102};
103
104void emif_get_device_timings(u32 emif_nr,
105 const struct lpddr2_device_timings **cs0_device_timings,
106 const struct lpddr2_device_timings **cs1_device_timings)
107{
108 /* Assume Identical devices on EMIF1 & EMIF2 */
109 *cs0_device_timings = &jedec_default_timings;
110 *cs1_device_timings = &jedec_default_timings;
111}
112#endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */