1 // SPDX-License-Identifier: GPL-2.0+
6 * Texas Instruments, <www.ti.com>
8 * Aneesh V <aneesh@ti.com> for OMAP4
13 #include <asm/arch/sys_proto.h>
14 #include <asm/utils.h>
16 #ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
17 #define print_timing_reg(reg) debug(#reg" - 0x%08x\n", (reg))
18 static u32 *const T_num = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_NUM;
19 static u32 *const T_den = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_DEN;
22 #ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
23 /* Base AC Timing values specified by JESD209-2 for 532MHz operation */
24 static const struct lpddr2_ac_timings timings_jedec_532_mhz = {
25 .max_freq = 532000000,
48 * Min tCK values specified by JESD209-2
49 * Min tCK specifies the minimum duration of some AC timing parameters in terms
50 * of the number of cycles. If the calculated number of cycles based on the
51 * absolute time value is less than the min tCK value, min tCK value should
52 * be used instead. This typically happens at low frequencies.
54 static const struct lpddr2_min_tck min_tck_jedec = {
69 static const struct lpddr2_ac_timings const*
70 jedec_ac_timings[MAX_NUM_SPEEDBINS] = {
71 &timings_jedec_532_mhz
74 static const struct lpddr2_device_timings jedec_default_timings = {
75 .ac_timings = jedec_ac_timings,
76 .min_tck = &min_tck_jedec
79 void emif_get_device_timings(u32 emif_nr,
80 const struct lpddr2_device_timings **cs0_device_timings,
81 const struct lpddr2_device_timings **cs1_device_timings)
83 /* Assume Identical devices on EMIF1 & EMIF2 */
84 *cs0_device_timings = &jedec_default_timings;
85 *cs1_device_timings = NULL;
87 #endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */