1 // SPDX-License-Identifier: GPL-2.0+
6 * Texas Instruments, <www.ti.com>
8 * Aneesh V <aneesh@ti.com>
13 #include <asm/arch/sys_proto.h>
14 #include <asm/utils.h>
16 #ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
17 u32 *const T_num = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_NUM;
18 u32 *const T_den = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_DEN;
21 #ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
22 /* Base AC Timing values specified by JESD209-2 for 400MHz operation */
23 static const struct lpddr2_ac_timings timings_jedec_400_mhz = {
24 .max_freq = 400000000,
46 /* Base AC Timing values specified by JESD209-2 for 200 MHz operation */
47 static const struct lpddr2_ac_timings timings_jedec_200_mhz = {
48 .max_freq = 200000000,
71 * Min tCK values specified by JESD209-2
72 * Min tCK specifies the minimum duration of some AC timing parameters in terms
73 * of the number of cycles. If the calculated number of cycles based on the
74 * absolute time value is less than the min tCK value, min tCK value should
75 * be used instead. This typically happens at low frequencies.
77 static const struct lpddr2_min_tck min_tck_jedec = {
92 static const struct lpddr2_ac_timings *jedec_ac_timings[MAX_NUM_SPEEDBINS] = {
93 &timings_jedec_200_mhz,
94 &timings_jedec_400_mhz
97 const struct lpddr2_device_timings jedec_default_timings = {
98 .ac_timings = jedec_ac_timings,
99 .min_tck = &min_tck_jedec
102 void emif_get_device_timings(u32 emif_nr,
103 const struct lpddr2_device_timings **cs0_device_timings,
104 const struct lpddr2_device_timings **cs1_device_timings)
106 /* Assume Identical devices on EMIF1 & EMIF2 */
107 *cs0_device_timings = &jedec_default_timings;
108 *cs1_device_timings = &jedec_default_timings;
110 #endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */