5 * Texas Instruments, <www.ti.com>
7 * Aneesh V <aneesh@ti.com> for OMAP4
9 * SPDX-License-Identifier: GPL-2.0+
14 #include <asm/arch/sys_proto.h>
15 #include <asm/utils.h>
17 #ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
18 #define print_timing_reg(reg) debug(#reg" - 0x%08x\n", (reg))
19 static u32
*const T_num
= (u32
*)OMAP_SRAM_SCRATCH_EMIF_T_NUM
;
20 static u32
*const T_den
= (u32
*)OMAP_SRAM_SCRATCH_EMIF_T_DEN
;
23 #ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
24 /* Base AC Timing values specified by JESD209-2 for 532MHz operation */
25 static const struct lpddr2_ac_timings timings_jedec_532_mhz
= {
26 .max_freq
= 532000000,
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.
55 static const struct lpddr2_min_tck min_tck_jedec
= {
70 static const struct lpddr2_ac_timings
const*
71 jedec_ac_timings
[MAX_NUM_SPEEDBINS
] = {
72 &timings_jedec_532_mhz
75 static const struct lpddr2_device_timings jedec_default_timings
= {
76 .ac_timings
= jedec_ac_timings
,
77 .min_tck
= &min_tck_jedec
80 void 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
)
84 /* Assume Identical devices on EMIF1 & EMIF2 */
85 *cs0_device_timings
= &jedec_default_timings
;
86 *cs1_device_timings
= NULL
;
88 #endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */