1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * EMIF programming
4 *
5 * (C) Copyright 2010
6 * Texas Instruments, <www.ti.com>
7 *
8 * Aneesh V <aneesh@ti.com> for OMAP4
9 */
10
11#include <common.h>
12#include <log.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
18#define print_timing_reg(reg) debug(#reg" - 0x%08x\n", (reg))
19static u32 *const T_num = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_NUM;
20static u32 *const T_den = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_DEN;
21#endif
22
23#ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
24/* Base AC Timing values specified by JESD209-2 for 532MHz operation */
25static const struct lpddr2_ac_timings timings_jedec_532_mhz = {
26	.max_freq = 532000000,
27	.RL = 8,
28	.tRPab = 21,
29	.tRCD = 18,
30	.tWR = 15,
31	.tRASmin = 42,
32	.tRRD = 10,
33	.tWTRx2 = 15,
34	.tXSR = 140,
35	.tXPx2 = 15,
36	.tRFCab = 130,
37	.tRTPx2 = 15,
38	.tCKE = 3,
39	.tCKESR = 15,
40	.tZQCS = 90,
41	.tZQCL = 360,
42	.tZQINIT = 1000,
43	.tDQSCKMAXx2 = 11,
44	.tRASmax = 70,
45	.tFAW = 50
46};
47
48/*
49 * Min tCK values specified by JESD209-2
50 * Min tCK specifies the minimum duration of some AC timing parameters in terms
51 * of the number of cycles. If the calculated number of cycles based on the
52 * absolute time value is less than the min tCK value, min tCK value should
53 * be used instead. This typically happens at low frequencies.
54 */
55static const struct lpddr2_min_tck min_tck_jedec = {
56	.tRL = 3,
57	.tRP_AB = 3,
58	.tRCD = 3,
59	.tWR = 3,
60	.tRAS_MIN = 3,
61	.tRRD = 2,
62	.tWTR = 2,
63	.tXP = 2,
64	.tRTP = 2,
65	.tCKE = 3,
66	.tCKESR = 3,
67	.tFAW = 8
68};
69
70static const struct lpddr2_ac_timings const*
71			jedec_ac_timings[MAX_NUM_SPEEDBINS] = {
72	&timings_jedec_532_mhz
73};
74
75static const struct lpddr2_device_timings jedec_default_timings = {
76	.ac_timings = jedec_ac_timings,
77	.min_tck = &min_tck_jedec
78};
79
80void emif_get_device_timings(u32 emif_nr,
81		const struct lpddr2_device_timings **cs0_device_timings,
82		const struct lpddr2_device_timings **cs1_device_timings)
83{
84	/* Assume Identical devices on EMIF1 & EMIF2 */
85	*cs0_device_timings = &jedec_default_timings;
86	*cs1_device_timings = NULL;
87}
88#endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */
89